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net: Fix recursive descent in __scm_destroy().
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / synclinkmp.c
blob6bdb44f7bec2804d1288b20e7b1b66e915ee81ed
1 /*
2 * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
3 *
4 * Device driver for Microgate SyncLink Multiport
5 * high speed multiprotocol serial adapter.
6 *
7 * written by Paul Fulghum for Microgate Corporation
8 * paulkf@microgate.com
9 *
10 * Microgate and SyncLink are trademarks of Microgate Corporation
11 *
12 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
13 * This code is released under the GNU General Public License (GPL)
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
25 * OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
29 #if defined(__i386__)
30 # define BREAKPOINT() asm(" int $3");
31 #else
32 # define BREAKPOINT() { }
33 #endif
34
35 #define MAX_DEVICES 12
36
37 #include <linux/module.h>
38 #include <linux/errno.h>
39 #include <linux/signal.h>
40 #include <linux/sched.h>
41 #include <linux/timer.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/major.h>
48 #include <linux/string.h>
49 #include <linux/fcntl.h>
50 #include <linux/ptrace.h>
51 #include <linux/ioport.h>
52 #include <linux/mm.h>
53 #include <linux/slab.h>
54 #include <linux/netdevice.h>
55 #include <linux/vmalloc.h>
56 #include <linux/init.h>
57 #include <linux/delay.h>
58 #include <linux/ioctl.h>
59
60 #include <asm/system.h>
61 #include <asm/io.h>
62 #include <asm/irq.h>
63 #include <asm/dma.h>
64 #include <linux/bitops.h>
65 #include <asm/types.h>
66 #include <linux/termios.h>
67 #include <linux/workqueue.h>
68 #include <linux/hdlc.h>
69 #include <linux/synclink.h>
70
71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
72 #define SYNCLINK_GENERIC_HDLC 1
73 #else
74 #define SYNCLINK_GENERIC_HDLC 0
75 #endif
76
77 #define GET_USER(error,value,addr) error = get_user(value,addr)
78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
81
82 #include <asm/uaccess.h>
83
84 static MGSL_PARAMS default_params = {
85 MGSL_MODE_HDLC, /* unsigned long mode */
86 0, /* unsigned char loopback; */
87 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
88 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
89 0, /* unsigned long clock_speed; */
90 0xff, /* unsigned char addr_filter; */
91 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
92 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
93 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
94 9600, /* unsigned long data_rate; */
95 8, /* unsigned char data_bits; */
96 1, /* unsigned char stop_bits; */
97 ASYNC_PARITY_NONE /* unsigned char parity; */
98 };
99
100 /* size in bytes of DMA data buffers */
101 #define SCABUFSIZE 1024
102 #define SCA_MEM_SIZE 0x40000
103 #define SCA_BASE_SIZE 512
104 #define SCA_REG_SIZE 16
105 #define SCA_MAX_PORTS 4
106 #define SCAMAXDESC 128
107
108 #define BUFFERLISTSIZE 4096
109
110 /* SCA-I style DMA buffer descriptor */
111 typedef struct _SCADESC
112 {
113 u16 next; /* lower l6 bits of next descriptor addr */
114 u16 buf_ptr; /* lower 16 bits of buffer addr */
115 u8 buf_base; /* upper 8 bits of buffer addr */
116 u8 pad1;
117 u16 length; /* length of buffer */
118 u8 status; /* status of buffer */
119 u8 pad2;
120 } SCADESC, *PSCADESC;
121
122 typedef struct _SCADESC_EX
123 {
124 /* device driver bookkeeping section */
125 char *virt_addr; /* virtual address of data buffer */
126 u16 phys_entry; /* lower 16-bits of physical address of this descriptor */
127 } SCADESC_EX, *PSCADESC_EX;
128
129 /* The queue of BH actions to be performed */
130
131 #define BH_RECEIVE 1
132 #define BH_TRANSMIT 2
133 #define BH_STATUS 4
134
135 #define IO_PIN_SHUTDOWN_LIMIT 100
136
137 struct _input_signal_events {
138 int ri_up;
139 int ri_down;
140 int dsr_up;
141 int dsr_down;
142 int dcd_up;
143 int dcd_down;
144 int cts_up;
145 int cts_down;
146 };
147
148 /*
149 * Device instance data structure
150 */
151 typedef struct _synclinkmp_info {
152 void *if_ptr; /* General purpose pointer (used by SPPP) */
153 int magic;
154 struct tty_port port;
155 int line;
156 unsigned short close_delay;
157 unsigned short closing_wait; /* time to wait before closing */
158
159 struct mgsl_icount icount;
160
161 int timeout;
162 int x_char; /* xon/xoff character */
163 u16 read_status_mask1; /* break detection (SR1 indications) */
164 u16 read_status_mask2; /* parity/framing/overun (SR2 indications) */
165 unsigned char ignore_status_mask1; /* break detection (SR1 indications) */
166 unsigned char ignore_status_mask2; /* parity/framing/overun (SR2 indications) */
167 unsigned char *tx_buf;
168 int tx_put;
169 int tx_get;
170 int tx_count;
171
172 wait_queue_head_t status_event_wait_q;
173 wait_queue_head_t event_wait_q;
174 struct timer_list tx_timer; /* HDLC transmit timeout timer */
175 struct _synclinkmp_info *next_device; /* device list link */
176 struct timer_list status_timer; /* input signal status check timer */
177
178 spinlock_t lock; /* spinlock for synchronizing with ISR */
179 struct work_struct task; /* task structure for scheduling bh */
180
181 u32 max_frame_size; /* as set by device config */
182
183 u32 pending_bh;
184
185 bool bh_running; /* Protection from multiple */
186 int isr_overflow;
187 bool bh_requested;
188
189 int dcd_chkcount; /* check counts to prevent */
190 int cts_chkcount; /* too many IRQs if a signal */
191 int dsr_chkcount; /* is floating */
192 int ri_chkcount;
193
194 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
195 unsigned long buffer_list_phys;
196
197 unsigned int rx_buf_count; /* count of total allocated Rx buffers */
198 SCADESC *rx_buf_list; /* list of receive buffer entries */
199 SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
200 unsigned int current_rx_buf;
201
202 unsigned int tx_buf_count; /* count of total allocated Tx buffers */
203 SCADESC *tx_buf_list; /* list of transmit buffer entries */
204 SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
205 unsigned int last_tx_buf;
206
207 unsigned char *tmp_rx_buf;
208 unsigned int tmp_rx_buf_count;
209
210 bool rx_enabled;
211 bool rx_overflow;
212
213 bool tx_enabled;
214 bool tx_active;
215 u32 idle_mode;
216
217 unsigned char ie0_value;
218 unsigned char ie1_value;
219 unsigned char ie2_value;
220 unsigned char ctrlreg_value;
221 unsigned char old_signals;
222
223 char device_name[25]; /* device instance name */
224
225 int port_count;
226 int adapter_num;
227 int port_num;
228
229 struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
230
231 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
232
233 unsigned int irq_level; /* interrupt level */
234 unsigned long irq_flags;
235 bool irq_requested; /* true if IRQ requested */
236
237 MGSL_PARAMS params; /* communications parameters */
238
239 unsigned char serial_signals; /* current serial signal states */
240
241 bool irq_occurred; /* for diagnostics use */
242 unsigned int init_error; /* Initialization startup error */
243
244 u32 last_mem_alloc;
245 unsigned char* memory_base; /* shared memory address (PCI only) */
246 u32 phys_memory_base;
247 int shared_mem_requested;
248
249 unsigned char* sca_base; /* HD64570 SCA Memory address */
250 u32 phys_sca_base;
251 u32 sca_offset;
252 bool sca_base_requested;
253
254 unsigned char* lcr_base; /* local config registers (PCI only) */
255 u32 phys_lcr_base;
256 u32 lcr_offset;
257 int lcr_mem_requested;
258
259 unsigned char* statctrl_base; /* status/control register memory */
260 u32 phys_statctrl_base;
261 u32 statctrl_offset;
262 bool sca_statctrl_requested;
263
264 u32 misc_ctrl_value;
265 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
266 char char_buf[MAX_ASYNC_BUFFER_SIZE];
267 bool drop_rts_on_tx_done;
268
269 struct _input_signal_events input_signal_events;
270
271 /* SPPP/Cisco HDLC device parts */
272 int netcount;
273 spinlock_t netlock;
274
275 #if SYNCLINK_GENERIC_HDLC
276 struct net_device *netdev;
277 #endif
278
279 } SLMP_INFO;
280
281 #define MGSL_MAGIC 0x5401
282
283 /*
284 * define serial signal status change macros
285 */
286 #define MISCSTATUS_DCD_LATCHED (SerialSignal_DCD<<8) /* indicates change in DCD */
287 #define MISCSTATUS_RI_LATCHED (SerialSignal_RI<<8) /* indicates change in RI */
288 #define MISCSTATUS_CTS_LATCHED (SerialSignal_CTS<<8) /* indicates change in CTS */
289 #define MISCSTATUS_DSR_LATCHED (SerialSignal_DSR<<8) /* change in DSR */
290
291 /* Common Register macros */
292 #define LPR 0x00
293 #define PABR0 0x02
294 #define PABR1 0x03
295 #define WCRL 0x04
296 #define WCRM 0x05
297 #define WCRH 0x06
298 #define DPCR 0x08
299 #define DMER 0x09
300 #define ISR0 0x10
301 #define ISR1 0x11
302 #define ISR2 0x12
303 #define IER0 0x14
304 #define IER1 0x15
305 #define IER2 0x16
306 #define ITCR 0x18
307 #define INTVR 0x1a
308 #define IMVR 0x1c
309
310 /* MSCI Register macros */
311 #define TRB 0x20
312 #define TRBL 0x20
313 #define TRBH 0x21
314 #define SR0 0x22
315 #define SR1 0x23
316 #define SR2 0x24
317 #define SR3 0x25
318 #define FST 0x26
319 #define IE0 0x28
320 #define IE1 0x29
321 #define IE2 0x2a
322 #define FIE 0x2b
323 #define CMD 0x2c
324 #define MD0 0x2e
325 #define MD1 0x2f
326 #define MD2 0x30
327 #define CTL 0x31
328 #define SA0 0x32
329 #define SA1 0x33
330 #define IDL 0x34
331 #define TMC 0x35
332 #define RXS 0x36
333 #define TXS 0x37
334 #define TRC0 0x38
335 #define TRC1 0x39
336 #define RRC 0x3a
337 #define CST0 0x3c
338 #define CST1 0x3d
339
340 /* Timer Register Macros */
341 #define TCNT 0x60
342 #define TCNTL 0x60
343 #define TCNTH 0x61
344 #define TCONR 0x62
345 #define TCONRL 0x62
346 #define TCONRH 0x63
347 #define TMCS 0x64
348 #define TEPR 0x65
349
350 /* DMA Controller Register macros */
351 #define DARL 0x80
352 #define DARH 0x81
353 #define DARB 0x82
354 #define BAR 0x80
355 #define BARL 0x80
356 #define BARH 0x81
357 #define BARB 0x82
358 #define SAR 0x84
359 #define SARL 0x84
360 #define SARH 0x85
361 #define SARB 0x86
362 #define CPB 0x86
363 #define CDA 0x88
364 #define CDAL 0x88
365 #define CDAH 0x89
366 #define EDA 0x8a
367 #define EDAL 0x8a
368 #define EDAH 0x8b
369 #define BFL 0x8c
370 #define BFLL 0x8c
371 #define BFLH 0x8d
372 #define BCR 0x8e
373 #define BCRL 0x8e
374 #define BCRH 0x8f
375 #define DSR 0x90
376 #define DMR 0x91
377 #define FCT 0x93
378 #define DIR 0x94
379 #define DCMD 0x95
380
381 /* combine with timer or DMA register address */
382 #define TIMER0 0x00
383 #define TIMER1 0x08
384 #define TIMER2 0x10
385 #define TIMER3 0x18
386 #define RXDMA 0x00
387 #define TXDMA 0x20
388
389 /* SCA Command Codes */
390 #define NOOP 0x00
391 #define TXRESET 0x01
392 #define TXENABLE 0x02
393 #define TXDISABLE 0x03
394 #define TXCRCINIT 0x04
395 #define TXCRCEXCL 0x05
396 #define TXEOM 0x06
397 #define TXABORT 0x07
398 #define MPON 0x08
399 #define TXBUFCLR 0x09
400 #define RXRESET 0x11
401 #define RXENABLE 0x12
402 #define RXDISABLE 0x13
403 #define RXCRCINIT 0x14
404 #define RXREJECT 0x15
405 #define SEARCHMP 0x16
406 #define RXCRCEXCL 0x17
407 #define RXCRCCALC 0x18
408 #define CHRESET 0x21
409 #define HUNT 0x31
410
411 /* DMA command codes */
412 #define SWABORT 0x01
413 #define FEICLEAR 0x02
414
415 /* IE0 */
416 #define TXINTE BIT7
417 #define RXINTE BIT6
418 #define TXRDYE BIT1
419 #define RXRDYE BIT0
420
421 /* IE1 & SR1 */
422 #define UDRN BIT7
423 #define IDLE BIT6
424 #define SYNCD BIT4
425 #define FLGD BIT4
426 #define CCTS BIT3
427 #define CDCD BIT2
428 #define BRKD BIT1
429 #define ABTD BIT1
430 #define GAPD BIT1
431 #define BRKE BIT0
432 #define IDLD BIT0
433
434 /* IE2 & SR2 */
435 #define EOM BIT7
436 #define PMP BIT6
437 #define SHRT BIT6
438 #define PE BIT5
439 #define ABT BIT5
440 #define FRME BIT4
441 #define RBIT BIT4
442 #define OVRN BIT3
443 #define CRCE BIT2
444
445
446 /*
447 * Global linked list of SyncLink devices
448 */
449 static SLMP_INFO *synclinkmp_device_list = NULL;
450 static int synclinkmp_adapter_count = -1;
451 static int synclinkmp_device_count = 0;
452
453 /*
454 * Set this param to non-zero to load eax with the
455 * .text section address and breakpoint on module load.
456 * This is useful for use with gdb and add-symbol-file command.
457 */
458 static int break_on_load = 0;
459
460 /*
461 * Driver major number, defaults to zero to get auto
462 * assigned major number. May be forced as module parameter.
463 */
464 static int ttymajor = 0;
465
466 /*
467 * Array of user specified options for ISA adapters.
468 */
469 static int debug_level = 0;
470 static int maxframe[MAX_DEVICES] = {0,};
471
472 module_param(break_on_load, bool, 0);
473 module_param(ttymajor, int, 0);
474 module_param(debug_level, int, 0);
475 module_param_array(maxframe, int, NULL, 0);
476
477 static char *driver_name = "SyncLink MultiPort driver";
478 static char *driver_version = "$Revision: 4.38 $";
479
480 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
481 static void synclinkmp_remove_one(struct pci_dev *dev);
482
483 static struct pci_device_id synclinkmp_pci_tbl[] = {
484 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
485 { 0, }, /* terminate list */
486 };
487 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
488
489 MODULE_LICENSE("GPL");
490
491 static struct pci_driver synclinkmp_pci_driver = {
492 .name = "synclinkmp",
493 .id_table = synclinkmp_pci_tbl,
494 .probe = synclinkmp_init_one,
495 .remove = __devexit_p(synclinkmp_remove_one),
496 };
497
498
499 static struct tty_driver *serial_driver;
500
501 /* number of characters left in xmit buffer before we ask for more */
502 #define WAKEUP_CHARS 256
503
504
505 /* tty callbacks */
506
507 static int open(struct tty_struct *tty, struct file * filp);
508 static void close(struct tty_struct *tty, struct file * filp);
509 static void hangup(struct tty_struct *tty);
510 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
511
512 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
513 static int put_char(struct tty_struct *tty, unsigned char ch);
514 static void send_xchar(struct tty_struct *tty, char ch);
515 static void wait_until_sent(struct tty_struct *tty, int timeout);
516 static int write_room(struct tty_struct *tty);
517 static void flush_chars(struct tty_struct *tty);
518 static void flush_buffer(struct tty_struct *tty);
519 static void tx_hold(struct tty_struct *tty);
520 static void tx_release(struct tty_struct *tty);
521
522 static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
523 static int read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
524 static int chars_in_buffer(struct tty_struct *tty);
525 static void throttle(struct tty_struct * tty);
526 static void unthrottle(struct tty_struct * tty);
527 static int set_break(struct tty_struct *tty, int break_state);
528
529 #if SYNCLINK_GENERIC_HDLC
530 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
531 static void hdlcdev_tx_done(SLMP_INFO *info);
532 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
533 static int hdlcdev_init(SLMP_INFO *info);
534 static void hdlcdev_exit(SLMP_INFO *info);
535 #endif
536
537 /* ioctl handlers */
538
539 static int get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
540 static int get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
541 static int set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
542 static int get_txidle(SLMP_INFO *info, int __user *idle_mode);
543 static int set_txidle(SLMP_INFO *info, int idle_mode);
544 static int tx_enable(SLMP_INFO *info, int enable);
545 static int tx_abort(SLMP_INFO *info);
546 static int rx_enable(SLMP_INFO *info, int enable);
547 static int modem_input_wait(SLMP_INFO *info,int arg);
548 static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
549 static int tiocmget(struct tty_struct *tty, struct file *file);
550 static int tiocmset(struct tty_struct *tty, struct file *file,
551 unsigned int set, unsigned int clear);
552 static int set_break(struct tty_struct *tty, int break_state);
553
554 static void add_device(SLMP_INFO *info);
555 static void device_init(int adapter_num, struct pci_dev *pdev);
556 static int claim_resources(SLMP_INFO *info);
557 static void release_resources(SLMP_INFO *info);
558
559 static int startup(SLMP_INFO *info);
560 static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
561 static void shutdown(SLMP_INFO *info);
562 static void program_hw(SLMP_INFO *info);
563 static void change_params(SLMP_INFO *info);
564
565 static bool init_adapter(SLMP_INFO *info);
566 static bool register_test(SLMP_INFO *info);
567 static bool irq_test(SLMP_INFO *info);
568 static bool loopback_test(SLMP_INFO *info);
569 static int adapter_test(SLMP_INFO *info);
570 static bool memory_test(SLMP_INFO *info);
571
572 static void reset_adapter(SLMP_INFO *info);
573 static void reset_port(SLMP_INFO *info);
574 static void async_mode(SLMP_INFO *info);
575 static void hdlc_mode(SLMP_INFO *info);
576
577 static void rx_stop(SLMP_INFO *info);
578 static void rx_start(SLMP_INFO *info);
579 static void rx_reset_buffers(SLMP_INFO *info);
580 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
581 static bool rx_get_frame(SLMP_INFO *info);
582
583 static void tx_start(SLMP_INFO *info);
584 static void tx_stop(SLMP_INFO *info);
585 static void tx_load_fifo(SLMP_INFO *info);
586 static void tx_set_idle(SLMP_INFO *info);
587 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
588
589 static void get_signals(SLMP_INFO *info);
590 static void set_signals(SLMP_INFO *info);
591 static void enable_loopback(SLMP_INFO *info, int enable);
592 static void set_rate(SLMP_INFO *info, u32 data_rate);
593
594 static int bh_action(SLMP_INFO *info);
595 static void bh_handler(struct work_struct *work);
596 static void bh_receive(SLMP_INFO *info);
597 static void bh_transmit(SLMP_INFO *info);
598 static void bh_status(SLMP_INFO *info);
599 static void isr_timer(SLMP_INFO *info);
600 static void isr_rxint(SLMP_INFO *info);
601 static void isr_rxrdy(SLMP_INFO *info);
602 static void isr_txint(SLMP_INFO *info);
603 static void isr_txrdy(SLMP_INFO *info);
604 static void isr_rxdmaok(SLMP_INFO *info);
605 static void isr_rxdmaerror(SLMP_INFO *info);
606 static void isr_txdmaok(SLMP_INFO *info);
607 static void isr_txdmaerror(SLMP_INFO *info);
608 static void isr_io_pin(SLMP_INFO *info, u16 status);
609
610 static int alloc_dma_bufs(SLMP_INFO *info);
611 static void free_dma_bufs(SLMP_INFO *info);
612 static int alloc_buf_list(SLMP_INFO *info);
613 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
614 static int alloc_tmp_rx_buf(SLMP_INFO *info);
615 static void free_tmp_rx_buf(SLMP_INFO *info);
616
617 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
618 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
619 static void tx_timeout(unsigned long context);
620 static void status_timeout(unsigned long context);
621
622 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
623 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
624 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
625 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
626 static unsigned char read_status_reg(SLMP_INFO * info);
627 static void write_control_reg(SLMP_INFO * info);
628
629
630 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
631 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
632 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
633
634 static u32 misc_ctrl_value = 0x007e4040;
635 static u32 lcr1_brdr_value = 0x00800028;
636
637 static u32 read_ahead_count = 8;
638
639 /* DPCR, DMA Priority Control
640 *
641 * 07..05 Not used, must be 0
642 * 04 BRC, bus release condition: 0=all transfers complete
643 * 1=release after 1 xfer on all channels
644 * 03 CCC, channel change condition: 0=every cycle
645 * 1=after each channel completes all xfers
646 * 02..00 PR<2..0>, priority 100=round robin
647 *
648 * 00000100 = 0x00
649 */
650 static unsigned char dma_priority = 0x04;
651
652 // Number of bytes that can be written to shared RAM
653 // in a single write operation
654 static u32 sca_pci_load_interval = 64;
655
656 /*
657 * 1st function defined in .text section. Calling this function in
658 * init_module() followed by a breakpoint allows a remote debugger
659 * (gdb) to get the .text address for the add-symbol-file command.
660 * This allows remote debugging of dynamically loadable modules.
661 */
662 static void* synclinkmp_get_text_ptr(void);
663 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
664
665 static inline int sanity_check(SLMP_INFO *info,
666 char *name, const char *routine)
667 {
668 #ifdef SANITY_CHECK
669 static const char *badmagic =
670 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
671 static const char *badinfo =
672 "Warning: null synclinkmp_struct for (%s) in %s\n";
673
674 if (!info) {
675 printk(badinfo, name, routine);
676 return 1;
677 }
678 if (info->magic != MGSL_MAGIC) {
679 printk(badmagic, name, routine);
680 return 1;
681 }
682 #else
683 if (!info)
684 return 1;
685 #endif
686 return 0;
687 }
688
689 /**
690 * line discipline callback wrappers
691 *
692 * The wrappers maintain line discipline references
693 * while calling into the line discipline.
694 *
695 * ldisc_receive_buf - pass receive data to line discipline
696 */
697
698 static void ldisc_receive_buf(struct tty_struct *tty,
699 const __u8 *data, char *flags, int count)
700 {
701 struct tty_ldisc *ld;
702 if (!tty)
703 return;
704 ld = tty_ldisc_ref(tty);
705 if (ld) {
706 if (ld->ops->receive_buf)
707 ld->ops->receive_buf(tty, data, flags, count);
708 tty_ldisc_deref(ld);
709 }
710 }
711
712 /* tty callbacks */
713
714 /* Called when a port is opened. Init and enable port.
715 */
716 static int open(struct tty_struct *tty, struct file *filp)
717 {
718 SLMP_INFO *info;
719 int retval, line;
720 unsigned long flags;
721
722 line = tty->index;
723 if ((line < 0) || (line >= synclinkmp_device_count)) {
724 printk("%s(%d): open with invalid line #%d.\n",
725 __FILE__,__LINE__,line);
726 return -ENODEV;
727 }
728
729 info = synclinkmp_device_list;
730 while(info && info->line != line)
731 info = info->next_device;
732 if (sanity_check(info, tty->name, "open"))
733 return -ENODEV;
734 if ( info->init_error ) {
735 printk("%s(%d):%s device is not allocated, init error=%d\n",
736 __FILE__,__LINE__,info->device_name,info->init_error);
737 return -ENODEV;
738 }
739
740 tty->driver_data = info;
741 info->port.tty = tty;
742
743 if (debug_level >= DEBUG_LEVEL_INFO)
744 printk("%s(%d):%s open(), old ref count = %d\n",
745 __FILE__,__LINE__,tty->driver->name, info->port.count);
746
747 /* If port is closing, signal caller to try again */
748 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
749 if (info->port.flags & ASYNC_CLOSING)
750 interruptible_sleep_on(&info->port.close_wait);
751 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
752 -EAGAIN : -ERESTARTSYS);
753 goto cleanup;
754 }
755
756 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
757
758 spin_lock_irqsave(&info->netlock, flags);
759 if (info->netcount) {
760 retval = -EBUSY;
761 spin_unlock_irqrestore(&info->netlock, flags);
762 goto cleanup;
763 }
764 info->port.count++;
765 spin_unlock_irqrestore(&info->netlock, flags);
766
767 if (info->port.count == 1) {
768 /* 1st open on this device, init hardware */
769 retval = startup(info);
770 if (retval < 0)
771 goto cleanup;
772 }
773
774 retval = block_til_ready(tty, filp, info);
775 if (retval) {
776 if (debug_level >= DEBUG_LEVEL_INFO)
777 printk("%s(%d):%s block_til_ready() returned %d\n",
778 __FILE__,__LINE__, info->device_name, retval);
779 goto cleanup;
780 }
781
782 if (debug_level >= DEBUG_LEVEL_INFO)
783 printk("%s(%d):%s open() success\n",
784 __FILE__,__LINE__, info->device_name);
785 retval = 0;
786
787 cleanup:
788 if (retval) {
789 if (tty->count == 1)
790 info->port.tty = NULL; /* tty layer will release tty struct */
791 if(info->port.count)
792 info->port.count--;
793 }
794
795 return retval;
796 }
797
798 /* Called when port is closed. Wait for remaining data to be
799 * sent. Disable port and free resources.
800 */
801 static void close(struct tty_struct *tty, struct file *filp)
802 {
803 SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
804
805 if (sanity_check(info, tty->name, "close"))
806 return;
807
808 if (debug_level >= DEBUG_LEVEL_INFO)
809 printk("%s(%d):%s close() entry, count=%d\n",
810 __FILE__,__LINE__, info->device_name, info->port.count);
811
812 if (!info->port.count)
813 return;
814
815 if (tty_hung_up_p(filp))
816 goto cleanup;
817
818 if ((tty->count == 1) && (info->port.count != 1)) {
819 /*
820 * tty->count is 1 and the tty structure will be freed.
821 * info->port.count should be one in this case.
822 * if it's not, correct it so that the port is shutdown.
823 */
824 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
825 "info->port.count is %d\n",
826 __FILE__,__LINE__, info->device_name, info->port.count);
827 info->port.count = 1;
828 }
829
830 info->port.count--;
831
832 /* if at least one open remaining, leave hardware active */
833 if (info->port.count)
834 goto cleanup;
835
836 info->port.flags |= ASYNC_CLOSING;
837
838 /* set tty->closing to notify line discipline to
839 * only process XON/XOFF characters. Only the N_TTY
840 * discipline appears to use this (ppp does not).
841 */
842 tty->closing = 1;
843
844 /* wait for transmit data to clear all layers */
845
846 if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
847 if (debug_level >= DEBUG_LEVEL_INFO)
848 printk("%s(%d):%s close() calling tty_wait_until_sent\n",
849 __FILE__,__LINE__, info->device_name );
850 tty_wait_until_sent(tty, info->port.closing_wait);
851 }
852
853 if (info->port.flags & ASYNC_INITIALIZED)
854 wait_until_sent(tty, info->timeout);
855
856 flush_buffer(tty);
857
858 tty_ldisc_flush(tty);
859
860 shutdown(info);
861
862 tty->closing = 0;
863 info->port.tty = NULL;
864
865 if (info->port.blocked_open) {
866 if (info->port.close_delay) {
867 msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
868 }
869 wake_up_interruptible(&info->port.open_wait);
870 }
871
872 info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
873
874 wake_up_interruptible(&info->port.close_wait);
875
876 cleanup:
877 if (debug_level >= DEBUG_LEVEL_INFO)
878 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
879 tty->driver->name, info->port.count);
880 }
881
882 /* Called by tty_hangup() when a hangup is signaled.
883 * This is the same as closing all open descriptors for the port.
884 */
885 static void hangup(struct tty_struct *tty)
886 {
887 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
888
889 if (debug_level >= DEBUG_LEVEL_INFO)
890 printk("%s(%d):%s hangup()\n",
891 __FILE__,__LINE__, info->device_name );
892
893 if (sanity_check(info, tty->name, "hangup"))
894 return;
895
896 flush_buffer(tty);
897 shutdown(info);
898
899 info->port.count = 0;
900 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
901 info->port.tty = NULL;
902
903 wake_up_interruptible(&info->port.open_wait);
904 }
905
906 /* Set new termios settings
907 */
908 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
909 {
910 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
911 unsigned long flags;
912
913 if (debug_level >= DEBUG_LEVEL_INFO)
914 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
915 tty->driver->name );
916
917 change_params(info);
918
919 /* Handle transition to B0 status */
920 if (old_termios->c_cflag & CBAUD &&
921 !(tty->termios->c_cflag & CBAUD)) {
922 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
923 spin_lock_irqsave(&info->lock,flags);
924 set_signals(info);
925 spin_unlock_irqrestore(&info->lock,flags);
926 }
927
928 /* Handle transition away from B0 status */
929 if (!(old_termios->c_cflag & CBAUD) &&
930 tty->termios->c_cflag & CBAUD) {
931 info->serial_signals |= SerialSignal_DTR;
932 if (!(tty->termios->c_cflag & CRTSCTS) ||
933 !test_bit(TTY_THROTTLED, &tty->flags)) {
934 info->serial_signals |= SerialSignal_RTS;
935 }
936 spin_lock_irqsave(&info->lock,flags);
937 set_signals(info);
938 spin_unlock_irqrestore(&info->lock,flags);
939 }
940
941 /* Handle turning off CRTSCTS */
942 if (old_termios->c_cflag & CRTSCTS &&
943 !(tty->termios->c_cflag & CRTSCTS)) {
944 tty->hw_stopped = 0;
945 tx_release(tty);
946 }
947 }
948
949 /* Send a block of data
950 *
951 * Arguments:
952 *
953 * tty pointer to tty information structure
954 * buf pointer to buffer containing send data
955 * count size of send data in bytes
956 *
957 * Return Value: number of characters written
958 */
959 static int write(struct tty_struct *tty,
960 const unsigned char *buf, int count)
961 {
962 int c, ret = 0;
963 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
964 unsigned long flags;
965
966 if (debug_level >= DEBUG_LEVEL_INFO)
967 printk("%s(%d):%s write() count=%d\n",
968 __FILE__,__LINE__,info->device_name,count);
969
970 if (sanity_check(info, tty->name, "write"))
971 goto cleanup;
972
973 if (!info->tx_buf)
974 goto cleanup;
975
976 if (info->params.mode == MGSL_MODE_HDLC) {
977 if (count > info->max_frame_size) {
978 ret = -EIO;
979 goto cleanup;
980 }
981 if (info->tx_active)
982 goto cleanup;
983 if (info->tx_count) {
984 /* send accumulated data from send_char() calls */
985 /* as frame and wait before accepting more data. */
986 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
987 goto start;
988 }
989 ret = info->tx_count = count;
990 tx_load_dma_buffer(info, buf, count);
991 goto start;
992 }
993
994 for (;;) {
995 c = min_t(int, count,
996 min(info->max_frame_size - info->tx_count - 1,
997 info->max_frame_size - info->tx_put));
998 if (c <= 0)
999 break;
1000
1001 memcpy(info->tx_buf + info->tx_put, buf, c);
1002
1003 spin_lock_irqsave(&info->lock,flags);
1004 info->tx_put += c;
1005 if (info->tx_put >= info->max_frame_size)
1006 info->tx_put -= info->max_frame_size;
1007 info->tx_count += c;
1008 spin_unlock_irqrestore(&info->lock,flags);
1009
1010 buf += c;
1011 count -= c;
1012 ret += c;
1013 }
1014
1015 if (info->params.mode == MGSL_MODE_HDLC) {
1016 if (count) {
1017 ret = info->tx_count = 0;
1018 goto cleanup;
1019 }
1020 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1021 }
1022 start:
1023 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1024 spin_lock_irqsave(&info->lock,flags);
1025 if (!info->tx_active)
1026 tx_start(info);
1027 spin_unlock_irqrestore(&info->lock,flags);
1028 }
1029
1030 cleanup:
1031 if (debug_level >= DEBUG_LEVEL_INFO)
1032 printk( "%s(%d):%s write() returning=%d\n",
1033 __FILE__,__LINE__,info->device_name,ret);
1034 return ret;
1035 }
1036
1037 /* Add a character to the transmit buffer.
1038 */
1039 static int put_char(struct tty_struct *tty, unsigned char ch)
1040 {
1041 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1042 unsigned long flags;
1043 int ret = 0;
1044
1045 if ( debug_level >= DEBUG_LEVEL_INFO ) {
1046 printk( "%s(%d):%s put_char(%d)\n",
1047 __FILE__,__LINE__,info->device_name,ch);
1048 }
1049
1050 if (sanity_check(info, tty->name, "put_char"))
1051 return 0;
1052
1053 if (!info->tx_buf)
1054 return 0;
1055
1056 spin_lock_irqsave(&info->lock,flags);
1057
1058 if ( (info->params.mode != MGSL_MODE_HDLC) ||
1059 !info->tx_active ) {
1060
1061 if (info->tx_count < info->max_frame_size - 1) {
1062 info->tx_buf[info->tx_put++] = ch;
1063 if (info->tx_put >= info->max_frame_size)
1064 info->tx_put -= info->max_frame_size;
1065 info->tx_count++;
1066 ret = 1;
1067 }
1068 }
1069
1070 spin_unlock_irqrestore(&info->lock,flags);
1071 return ret;
1072 }
1073
1074 /* Send a high-priority XON/XOFF character
1075 */
1076 static void send_xchar(struct tty_struct *tty, char ch)
1077 {
1078 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1079 unsigned long flags;
1080
1081 if (debug_level >= DEBUG_LEVEL_INFO)
1082 printk("%s(%d):%s send_xchar(%d)\n",
1083 __FILE__,__LINE__, info->device_name, ch );
1084
1085 if (sanity_check(info, tty->name, "send_xchar"))
1086 return;
1087
1088 info->x_char = ch;
1089 if (ch) {
1090 /* Make sure transmit interrupts are on */
1091 spin_lock_irqsave(&info->lock,flags);
1092 if (!info->tx_enabled)
1093 tx_start(info);
1094 spin_unlock_irqrestore(&info->lock,flags);
1095 }
1096 }
1097
1098 /* Wait until the transmitter is empty.
1099 */
1100 static void wait_until_sent(struct tty_struct *tty, int timeout)
1101 {
1102 SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1103 unsigned long orig_jiffies, char_time;
1104
1105 if (!info )
1106 return;
1107
1108 if (debug_level >= DEBUG_LEVEL_INFO)
1109 printk("%s(%d):%s wait_until_sent() entry\n",
1110 __FILE__,__LINE__, info->device_name );
1111
1112 if (sanity_check(info, tty->name, "wait_until_sent"))
1113 return;
1114
1115 lock_kernel();
1116
1117 if (!(info->port.flags & ASYNC_INITIALIZED))
1118 goto exit;
1119
1120 orig_jiffies = jiffies;
1121
1122 /* Set check interval to 1/5 of estimated time to
1123 * send a character, and make it at least 1. The check
1124 * interval should also be less than the timeout.
1125 * Note: use tight timings here to satisfy the NIST-PCTS.
1126 */
1127
1128 if ( info->params.data_rate ) {
1129 char_time = info->timeout/(32 * 5);
1130 if (!char_time)
1131 char_time++;
1132 } else
1133 char_time = 1;
1134
1135 if (timeout)
1136 char_time = min_t(unsigned long, char_time, timeout);
1137
1138 if ( info->params.mode == MGSL_MODE_HDLC ) {
1139 while (info->tx_active) {
1140 msleep_interruptible(jiffies_to_msecs(char_time));
1141 if (signal_pending(current))
1142 break;
1143 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1144 break;
1145 }
1146 } else {
1147 //TODO: determine if there is something similar to USC16C32
1148 // TXSTATUS_ALL_SENT status
1149 while ( info->tx_active && info->tx_enabled) {
1150 msleep_interruptible(jiffies_to_msecs(char_time));
1151 if (signal_pending(current))
1152 break;
1153 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1154 break;
1155 }
1156 }
1157
1158 exit:
1159 unlock_kernel();
1160 if (debug_level >= DEBUG_LEVEL_INFO)
1161 printk("%s(%d):%s wait_until_sent() exit\n",
1162 __FILE__,__LINE__, info->device_name );
1163 }
1164
1165 /* Return the count of free bytes in transmit buffer
1166 */
1167 static int write_room(struct tty_struct *tty)
1168 {
1169 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1170 int ret;
1171
1172 if (sanity_check(info, tty->name, "write_room"))
1173 return 0;
1174
1175 lock_kernel();
1176 if (info->params.mode == MGSL_MODE_HDLC) {
1177 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1178 } else {
1179 ret = info->max_frame_size - info->tx_count - 1;
1180 if (ret < 0)
1181 ret = 0;
1182 }
1183 unlock_kernel();
1184
1185 if (debug_level >= DEBUG_LEVEL_INFO)
1186 printk("%s(%d):%s write_room()=%d\n",
1187 __FILE__, __LINE__, info->device_name, ret);
1188
1189 return ret;
1190 }
1191
1192 /* enable transmitter and send remaining buffered characters
1193 */
1194 static void flush_chars(struct tty_struct *tty)
1195 {
1196 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1197 unsigned long flags;
1198
1199 if ( debug_level >= DEBUG_LEVEL_INFO )
1200 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1201 __FILE__,__LINE__,info->device_name,info->tx_count);
1202
1203 if (sanity_check(info, tty->name, "flush_chars"))
1204 return;
1205
1206 if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1207 !info->tx_buf)
1208 return;
1209
1210 if ( debug_level >= DEBUG_LEVEL_INFO )
1211 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1212 __FILE__,__LINE__,info->device_name );
1213
1214 spin_lock_irqsave(&info->lock,flags);
1215
1216 if (!info->tx_active) {
1217 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1218 info->tx_count ) {
1219 /* operating in synchronous (frame oriented) mode */
1220 /* copy data from circular tx_buf to */
1221 /* transmit DMA buffer. */
1222 tx_load_dma_buffer(info,
1223 info->tx_buf,info->tx_count);
1224 }
1225 tx_start(info);
1226 }
1227
1228 spin_unlock_irqrestore(&info->lock,flags);
1229 }
1230
1231 /* Discard all data in the send buffer
1232 */
1233 static void flush_buffer(struct tty_struct *tty)
1234 {
1235 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1236 unsigned long flags;
1237
1238 if (debug_level >= DEBUG_LEVEL_INFO)
1239 printk("%s(%d):%s flush_buffer() entry\n",
1240 __FILE__,__LINE__, info->device_name );
1241
1242 if (sanity_check(info, tty->name, "flush_buffer"))
1243 return;
1244
1245 spin_lock_irqsave(&info->lock,flags);
1246 info->tx_count = info->tx_put = info->tx_get = 0;
1247 del_timer(&info->tx_timer);
1248 spin_unlock_irqrestore(&info->lock,flags);
1249
1250 tty_wakeup(tty);
1251 }
1252
1253 /* throttle (stop) transmitter
1254 */
1255 static void tx_hold(struct tty_struct *tty)
1256 {
1257 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1258 unsigned long flags;
1259
1260 if (sanity_check(info, tty->name, "tx_hold"))
1261 return;
1262
1263 if ( debug_level >= DEBUG_LEVEL_INFO )
1264 printk("%s(%d):%s tx_hold()\n",
1265 __FILE__,__LINE__,info->device_name);
1266
1267 spin_lock_irqsave(&info->lock,flags);
1268 if (info->tx_enabled)
1269 tx_stop(info);
1270 spin_unlock_irqrestore(&info->lock,flags);
1271 }
1272
1273 /* release (start) transmitter
1274 */
1275 static void tx_release(struct tty_struct *tty)
1276 {
1277 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1278 unsigned long flags;
1279
1280 if (sanity_check(info, tty->name, "tx_release"))
1281 return;
1282
1283 if ( debug_level >= DEBUG_LEVEL_INFO )
1284 printk("%s(%d):%s tx_release()\n",
1285 __FILE__,__LINE__,info->device_name);
1286
1287 spin_lock_irqsave(&info->lock,flags);
1288 if (!info->tx_enabled)
1289 tx_start(info);
1290 spin_unlock_irqrestore(&info->lock,flags);
1291 }
1292
1293 /* Service an IOCTL request
1294 *
1295 * Arguments:
1296 *
1297 * tty pointer to tty instance data
1298 * file pointer to associated file object for device
1299 * cmd IOCTL command code
1300 * arg command argument/context
1301 *
1302 * Return Value: 0 if success, otherwise error code
1303 */
1304 static int do_ioctl(struct tty_struct *tty, struct file *file,
1305 unsigned int cmd, unsigned long arg)
1306 {
1307 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1308 int error;
1309 struct mgsl_icount cnow; /* kernel counter temps */
1310 struct serial_icounter_struct __user *p_cuser; /* user space */
1311 unsigned long flags;
1312 void __user *argp = (void __user *)arg;
1313
1314 if (debug_level >= DEBUG_LEVEL_INFO)
1315 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1316 info->device_name, cmd );
1317
1318 if (sanity_check(info, tty->name, "ioctl"))
1319 return -ENODEV;
1320
1321 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1322 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1323 if (tty->flags & (1 << TTY_IO_ERROR))
1324 return -EIO;
1325 }
1326
1327 switch (cmd) {
1328 case MGSL_IOCGPARAMS:
1329 return get_params(info, argp);
1330 case MGSL_IOCSPARAMS:
1331 return set_params(info, argp);
1332 case MGSL_IOCGTXIDLE:
1333 return get_txidle(info, argp);
1334 case MGSL_IOCSTXIDLE:
1335 return set_txidle(info, (int)arg);
1336 case MGSL_IOCTXENABLE:
1337 return tx_enable(info, (int)arg);
1338 case MGSL_IOCRXENABLE:
1339 return rx_enable(info, (int)arg);
1340 case MGSL_IOCTXABORT:
1341 return tx_abort(info);
1342 case MGSL_IOCGSTATS:
1343 return get_stats(info, argp);
1344 case MGSL_IOCWAITEVENT:
1345 return wait_mgsl_event(info, argp);
1346 case MGSL_IOCLOOPTXDONE:
1347 return 0; // TODO: Not supported, need to document
1348 /* Wait for modem input (DCD,RI,DSR,CTS) change
1349 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1350 */
1351 case TIOCMIWAIT:
1352 return modem_input_wait(info,(int)arg);
1353
1354 /*
1355 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1356 * Return: write counters to the user passed counter struct
1357 * NB: both 1->0 and 0->1 transitions are counted except for
1358 * RI where only 0->1 is counted.
1359 */
1360 case TIOCGICOUNT:
1361 spin_lock_irqsave(&info->lock,flags);
1362 cnow = info->icount;
1363 spin_unlock_irqrestore(&info->lock,flags);
1364 p_cuser = argp;
1365 PUT_USER(error,cnow.cts, &p_cuser->cts);
1366 if (error) return error;
1367 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1368 if (error) return error;
1369 PUT_USER(error,cnow.rng, &p_cuser->rng);
1370 if (error) return error;
1371 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1372 if (error) return error;
1373 PUT_USER(error,cnow.rx, &p_cuser->rx);
1374 if (error) return error;
1375 PUT_USER(error,cnow.tx, &p_cuser->tx);
1376 if (error) return error;
1377 PUT_USER(error,cnow.frame, &p_cuser->frame);
1378 if (error) return error;
1379 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1380 if (error) return error;
1381 PUT_USER(error,cnow.parity, &p_cuser->parity);
1382 if (error) return error;
1383 PUT_USER(error,cnow.brk, &p_cuser->brk);
1384 if (error) return error;
1385 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1386 if (error) return error;
1387 return 0;
1388 default:
1389 return -ENOIOCTLCMD;
1390 }
1391 return 0;
1392 }
1393
1394 static int ioctl(struct tty_struct *tty, struct file *file,
1395 unsigned int cmd, unsigned long arg)
1396 {
1397 int ret;
1398 lock_kernel();
1399 ret = do_ioctl(tty, file, cmd, arg);
1400 unlock_kernel();
1401 return ret;
1402 }
1403
1404 /*
1405 * /proc fs routines....
1406 */
1407
1408 static inline int line_info(char *buf, SLMP_INFO *info)
1409 {
1410 char stat_buf[30];
1411 int ret;
1412 unsigned long flags;
1413
1414 ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1415 "\tIRQ=%d MaxFrameSize=%u\n",
1416 info->device_name,
1417 info->phys_sca_base,
1418 info->phys_memory_base,
1419 info->phys_statctrl_base,
1420 info->phys_lcr_base,
1421 info->irq_level,
1422 info->max_frame_size );
1423
1424 /* output current serial signal states */
1425 spin_lock_irqsave(&info->lock,flags);
1426 get_signals(info);
1427 spin_unlock_irqrestore(&info->lock,flags);
1428
1429 stat_buf[0] = 0;
1430 stat_buf[1] = 0;
1431 if (info->serial_signals & SerialSignal_RTS)
1432 strcat(stat_buf, "|RTS");
1433 if (info->serial_signals & SerialSignal_CTS)
1434 strcat(stat_buf, "|CTS");
1435 if (info->serial_signals & SerialSignal_DTR)
1436 strcat(stat_buf, "|DTR");
1437 if (info->serial_signals & SerialSignal_DSR)
1438 strcat(stat_buf, "|DSR");
1439 if (info->serial_signals & SerialSignal_DCD)
1440 strcat(stat_buf, "|CD");
1441 if (info->serial_signals & SerialSignal_RI)
1442 strcat(stat_buf, "|RI");
1443
1444 if (info->params.mode == MGSL_MODE_HDLC) {
1445 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1446 info->icount.txok, info->icount.rxok);
1447 if (info->icount.txunder)
1448 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1449 if (info->icount.txabort)
1450 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1451 if (info->icount.rxshort)
1452 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1453 if (info->icount.rxlong)
1454 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1455 if (info->icount.rxover)
1456 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1457 if (info->icount.rxcrc)
1458 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1459 } else {
1460 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1461 info->icount.tx, info->icount.rx);
1462 if (info->icount.frame)
1463 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1464 if (info->icount.parity)
1465 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1466 if (info->icount.brk)
1467 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1468 if (info->icount.overrun)
1469 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1470 }
1471
1472 /* Append serial signal status to end */
1473 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1474
1475 ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1476 info->tx_active,info->bh_requested,info->bh_running,
1477 info->pending_bh);
1478
1479 return ret;
1480 }
1481
1482 /* Called to print information about devices
1483 */
1484 static int read_proc(char *page, char **start, off_t off, int count,
1485 int *eof, void *data)
1486 {
1487 int len = 0, l;
1488 off_t begin = 0;
1489 SLMP_INFO *info;
1490
1491 len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1492
1493 info = synclinkmp_device_list;
1494 while( info ) {
1495 l = line_info(page + len, info);
1496 len += l;
1497 if (len+begin > off+count)
1498 goto done;
1499 if (len+begin < off) {
1500 begin += len;
1501 len = 0;
1502 }
1503 info = info->next_device;
1504 }
1505
1506 *eof = 1;
1507 done:
1508 if (off >= len+begin)
1509 return 0;
1510 *start = page + (off-begin);
1511 return ((count < begin+len-off) ? count : begin+len-off);
1512 }
1513
1514 /* Return the count of bytes in transmit buffer
1515 */
1516 static int chars_in_buffer(struct tty_struct *tty)
1517 {
1518 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1519
1520 if (sanity_check(info, tty->name, "chars_in_buffer"))
1521 return 0;
1522
1523 if (debug_level >= DEBUG_LEVEL_INFO)
1524 printk("%s(%d):%s chars_in_buffer()=%d\n",
1525 __FILE__, __LINE__, info->device_name, info->tx_count);
1526
1527 return info->tx_count;
1528 }
1529
1530 /* Signal remote device to throttle send data (our receive data)
1531 */
1532 static void throttle(struct tty_struct * tty)
1533 {
1534 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1535 unsigned long flags;
1536
1537 if (debug_level >= DEBUG_LEVEL_INFO)
1538 printk("%s(%d):%s throttle() entry\n",
1539 __FILE__,__LINE__, info->device_name );
1540
1541 if (sanity_check(info, tty->name, "throttle"))
1542 return;
1543
1544 if (I_IXOFF(tty))
1545 send_xchar(tty, STOP_CHAR(tty));
1546
1547 if (tty->termios->c_cflag & CRTSCTS) {
1548 spin_lock_irqsave(&info->lock,flags);
1549 info->serial_signals &= ~SerialSignal_RTS;
1550 set_signals(info);
1551 spin_unlock_irqrestore(&info->lock,flags);
1552 }
1553 }
1554
1555 /* Signal remote device to stop throttling send data (our receive data)
1556 */
1557 static void unthrottle(struct tty_struct * tty)
1558 {
1559 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1560 unsigned long flags;
1561
1562 if (debug_level >= DEBUG_LEVEL_INFO)
1563 printk("%s(%d):%s unthrottle() entry\n",
1564 __FILE__,__LINE__, info->device_name );
1565
1566 if (sanity_check(info, tty->name, "unthrottle"))
1567 return;
1568
1569 if (I_IXOFF(tty)) {
1570 if (info->x_char)
1571 info->x_char = 0;
1572 else
1573 send_xchar(tty, START_CHAR(tty));
1574 }
1575
1576 if (tty->termios->c_cflag & CRTSCTS) {
1577 spin_lock_irqsave(&info->lock,flags);
1578 info->serial_signals |= SerialSignal_RTS;
1579 set_signals(info);
1580 spin_unlock_irqrestore(&info->lock,flags);
1581 }
1582 }
1583
1584 /* set or clear transmit break condition
1585 * break_state -1=set break condition, 0=clear
1586 */
1587 static int set_break(struct tty_struct *tty, int break_state)
1588 {
1589 unsigned char RegValue;
1590 SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1591 unsigned long flags;
1592
1593 if (debug_level >= DEBUG_LEVEL_INFO)
1594 printk("%s(%d):%s set_break(%d)\n",
1595 __FILE__,__LINE__, info->device_name, break_state);
1596
1597 if (sanity_check(info, tty->name, "set_break"))
1598 return -EINVAL;
1599
1600 spin_lock_irqsave(&info->lock,flags);
1601 RegValue = read_reg(info, CTL);
1602 if (break_state == -1)
1603 RegValue |= BIT3;
1604 else
1605 RegValue &= ~BIT3;
1606 write_reg(info, CTL, RegValue);
1607 spin_unlock_irqrestore(&info->lock,flags);
1608 return 0;
1609 }
1610
1611 #if SYNCLINK_GENERIC_HDLC
1612
1613 /**
1614 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1615 * set encoding and frame check sequence (FCS) options
1616 *
1617 * dev pointer to network device structure
1618 * encoding serial encoding setting
1619 * parity FCS setting
1620 *
1621 * returns 0 if success, otherwise error code
1622 */
1623 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1624 unsigned short parity)
1625 {
1626 SLMP_INFO *info = dev_to_port(dev);
1627 unsigned char new_encoding;
1628 unsigned short new_crctype;
1629
1630 /* return error if TTY interface open */
1631 if (info->port.count)
1632 return -EBUSY;
1633
1634 switch (encoding)
1635 {
1636 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1637 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1638 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1639 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1640 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1641 default: return -EINVAL;
1642 }
1643
1644 switch (parity)
1645 {
1646 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1647 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1648 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1649 default: return -EINVAL;
1650 }
1651
1652 info->params.encoding = new_encoding;
1653 info->params.crc_type = new_crctype;
1654
1655 /* if network interface up, reprogram hardware */
1656 if (info->netcount)
1657 program_hw(info);
1658
1659 return 0;
1660 }
1661
1662 /**
1663 * called by generic HDLC layer to send frame
1664 *
1665 * skb socket buffer containing HDLC frame
1666 * dev pointer to network device structure
1667 *
1668 * returns 0 if success, otherwise error code
1669 */
1670 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1671 {
1672 SLMP_INFO *info = dev_to_port(dev);
1673 unsigned long flags;
1674
1675 if (debug_level >= DEBUG_LEVEL_INFO)
1676 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1677
1678 /* stop sending until this frame completes */
1679 netif_stop_queue(dev);
1680
1681 /* copy data to device buffers */
1682 info->tx_count = skb->len;
1683 tx_load_dma_buffer(info, skb->data, skb->len);
1684
1685 /* update network statistics */
1686 dev->stats.tx_packets++;
1687 dev->stats.tx_bytes += skb->len;
1688
1689 /* done with socket buffer, so free it */
1690 dev_kfree_skb(skb);
1691
1692 /* save start time for transmit timeout detection */
1693 dev->trans_start = jiffies;
1694
1695 /* start hardware transmitter if necessary */
1696 spin_lock_irqsave(&info->lock,flags);
1697 if (!info->tx_active)
1698 tx_start(info);
1699 spin_unlock_irqrestore(&info->lock,flags);
1700
1701 return 0;
1702 }
1703
1704 /**
1705 * called by network layer when interface enabled
1706 * claim resources and initialize hardware
1707 *
1708 * dev pointer to network device structure
1709 *
1710 * returns 0 if success, otherwise error code
1711 */
1712 static int hdlcdev_open(struct net_device *dev)
1713 {
1714 SLMP_INFO *info = dev_to_port(dev);
1715 int rc;
1716 unsigned long flags;
1717
1718 if (debug_level >= DEBUG_LEVEL_INFO)
1719 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1720
1721 /* generic HDLC layer open processing */
1722 if ((rc = hdlc_open(dev)))
1723 return rc;
1724
1725 /* arbitrate between network and tty opens */
1726 spin_lock_irqsave(&info->netlock, flags);
1727 if (info->port.count != 0 || info->netcount != 0) {
1728 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1729 spin_unlock_irqrestore(&info->netlock, flags);
1730 return -EBUSY;
1731 }
1732 info->netcount=1;
1733 spin_unlock_irqrestore(&info->netlock, flags);
1734
1735 /* claim resources and init adapter */
1736 if ((rc = startup(info)) != 0) {
1737 spin_lock_irqsave(&info->netlock, flags);
1738 info->netcount=0;
1739 spin_unlock_irqrestore(&info->netlock, flags);
1740 return rc;
1741 }
1742
1743 /* assert DTR and RTS, apply hardware settings */
1744 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1745 program_hw(info);
1746
1747 /* enable network layer transmit */
1748 dev->trans_start = jiffies;
1749 netif_start_queue(dev);
1750
1751 /* inform generic HDLC layer of current DCD status */
1752 spin_lock_irqsave(&info->lock, flags);
1753 get_signals(info);
1754 spin_unlock_irqrestore(&info->lock, flags);
1755 if (info->serial_signals & SerialSignal_DCD)
1756 netif_carrier_on(dev);
1757 else
1758 netif_carrier_off(dev);
1759 return 0;
1760 }
1761
1762 /**
1763 * called by network layer when interface is disabled
1764 * shutdown hardware and release resources
1765 *
1766 * dev pointer to network device structure
1767 *
1768 * returns 0 if success, otherwise error code
1769 */
1770 static int hdlcdev_close(struct net_device *dev)
1771 {
1772 SLMP_INFO *info = dev_to_port(dev);
1773 unsigned long flags;
1774
1775 if (debug_level >= DEBUG_LEVEL_INFO)
1776 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1777
1778 netif_stop_queue(dev);
1779
1780 /* shutdown adapter and release resources */
1781 shutdown(info);
1782
1783 hdlc_close(dev);
1784
1785 spin_lock_irqsave(&info->netlock, flags);
1786 info->netcount=0;
1787 spin_unlock_irqrestore(&info->netlock, flags);
1788
1789 return 0;
1790 }
1791
1792 /**
1793 * called by network layer to process IOCTL call to network device
1794 *
1795 * dev pointer to network device structure
1796 * ifr pointer to network interface request structure
1797 * cmd IOCTL command code
1798 *
1799 * returns 0 if success, otherwise error code
1800 */
1801 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1802 {
1803 const size_t size = sizeof(sync_serial_settings);
1804 sync_serial_settings new_line;
1805 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1806 SLMP_INFO *info = dev_to_port(dev);
1807 unsigned int flags;
1808
1809 if (debug_level >= DEBUG_LEVEL_INFO)
1810 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1811
1812 /* return error if TTY interface open */
1813 if (info->port.count)
1814 return -EBUSY;
1815
1816 if (cmd != SIOCWANDEV)
1817 return hdlc_ioctl(dev, ifr, cmd);
1818
1819 switch(ifr->ifr_settings.type) {
1820 case IF_GET_IFACE: /* return current sync_serial_settings */
1821
1822 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1823 if (ifr->ifr_settings.size < size) {
1824 ifr->ifr_settings.size = size; /* data size wanted */
1825 return -ENOBUFS;
1826 }
1827
1828 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1829 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1830 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1831 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1832
1833 switch (flags){
1834 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1835 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1836 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1837 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1838 default: new_line.clock_type = CLOCK_DEFAULT;
1839 }
1840
1841 new_line.clock_rate = info->params.clock_speed;
1842 new_line.loopback = info->params.loopback ? 1:0;
1843
1844 if (copy_to_user(line, &new_line, size))
1845 return -EFAULT;
1846 return 0;
1847
1848 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1849
1850 if(!capable(CAP_NET_ADMIN))
1851 return -EPERM;
1852 if (copy_from_user(&new_line, line, size))
1853 return -EFAULT;
1854
1855 switch (new_line.clock_type)
1856 {
1857 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1858 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1859 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1860 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1861 case CLOCK_DEFAULT: flags = info->params.flags &
1862 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1863 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1864 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1865 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1866 default: return -EINVAL;
1867 }
1868
1869 if (new_line.loopback != 0 && new_line.loopback != 1)
1870 return -EINVAL;
1871
1872 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1873 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1874 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1875 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1876 info->params.flags |= flags;
1877
1878 info->params.loopback = new_line.loopback;
1879
1880 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1881 info->params.clock_speed = new_line.clock_rate;
1882 else
1883 info->params.clock_speed = 0;
1884
1885 /* if network interface up, reprogram hardware */
1886 if (info->netcount)
1887 program_hw(info);
1888 return 0;
1889
1890 default:
1891 return hdlc_ioctl(dev, ifr, cmd);
1892 }
1893 }
1894
1895 /**
1896 * called by network layer when transmit timeout is detected
1897 *
1898 * dev pointer to network device structure
1899 */
1900 static void hdlcdev_tx_timeout(struct net_device *dev)
1901 {
1902 SLMP_INFO *info = dev_to_port(dev);
1903 unsigned long flags;
1904
1905 if (debug_level >= DEBUG_LEVEL_INFO)
1906 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1907
1908 dev->stats.tx_errors++;
1909 dev->stats.tx_aborted_errors++;
1910
1911 spin_lock_irqsave(&info->lock,flags);
1912 tx_stop(info);
1913 spin_unlock_irqrestore(&info->lock,flags);
1914
1915 netif_wake_queue(dev);
1916 }
1917
1918 /**
1919 * called by device driver when transmit completes
1920 * reenable network layer transmit if stopped
1921 *
1922 * info pointer to device instance information
1923 */
1924 static void hdlcdev_tx_done(SLMP_INFO *info)
1925 {
1926 if (netif_queue_stopped(info->netdev))
1927 netif_wake_queue(info->netdev);
1928 }
1929
1930 /**
1931 * called by device driver when frame received
1932 * pass frame to network layer
1933 *
1934 * info pointer to device instance information
1935 * buf pointer to buffer contianing frame data
1936 * size count of data bytes in buf
1937 */
1938 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1939 {
1940 struct sk_buff *skb = dev_alloc_skb(size);
1941 struct net_device *dev = info->netdev;
1942
1943 if (debug_level >= DEBUG_LEVEL_INFO)
1944 printk("hdlcdev_rx(%s)\n",dev->name);
1945
1946 if (skb == NULL) {
1947 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1948 dev->name);
1949 dev->stats.rx_dropped++;
1950 return;
1951 }
1952
1953 memcpy(skb_put(skb, size), buf, size);
1954
1955 skb->protocol = hdlc_type_trans(skb, dev);
1956
1957 dev->stats.rx_packets++;
1958 dev->stats.rx_bytes += size;
1959
1960 netif_rx(skb);
1961
1962 dev->last_rx = jiffies;
1963 }
1964
1965 /**
1966 * called by device driver when adding device instance
1967 * do generic HDLC initialization
1968 *
1969 * info pointer to device instance information
1970 *
1971 * returns 0 if success, otherwise error code
1972 */
1973 static int hdlcdev_init(SLMP_INFO *info)
1974 {
1975 int rc;
1976 struct net_device *dev;
1977 hdlc_device *hdlc;
1978
1979 /* allocate and initialize network and HDLC layer objects */
1980
1981 if (!(dev = alloc_hdlcdev(info))) {
1982 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1983 return -ENOMEM;
1984 }
1985
1986 /* for network layer reporting purposes only */
1987 dev->mem_start = info->phys_sca_base;
1988 dev->mem_end = info->phys_sca_base + SCA_BASE_SIZE - 1;
1989 dev->irq = info->irq_level;
1990
1991 /* network layer callbacks and settings */
1992 dev->do_ioctl = hdlcdev_ioctl;
1993 dev->open = hdlcdev_open;
1994 dev->stop = hdlcdev_close;
1995 dev->tx_timeout = hdlcdev_tx_timeout;
1996 dev->watchdog_timeo = 10*HZ;
1997 dev->tx_queue_len = 50;
1998
1999 /* generic HDLC layer callbacks and settings */
2000 hdlc = dev_to_hdlc(dev);
2001 hdlc->attach = hdlcdev_attach;
2002 hdlc->xmit = hdlcdev_xmit;
2003
2004 /* register objects with HDLC layer */
2005 if ((rc = register_hdlc_device(dev))) {
2006 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2007 free_netdev(dev);
2008 return rc;
2009 }
2010
2011 info->netdev = dev;
2012 return 0;
2013 }
2014
2015 /**
2016 * called by device driver when removing device instance
2017 * do generic HDLC cleanup
2018 *
2019 * info pointer to device instance information
2020 */
2021 static void hdlcdev_exit(SLMP_INFO *info)
2022 {
2023 unregister_hdlc_device(info->netdev);
2024 free_netdev(info->netdev);
2025 info->netdev = NULL;
2026 }
2027
2028 #endif /* CONFIG_HDLC */
2029
2030
2031 /* Return next bottom half action to perform.
2032 * Return Value: BH action code or 0 if nothing to do.
2033 */
2034 static int bh_action(SLMP_INFO *info)
2035 {
2036 unsigned long flags;
2037 int rc = 0;
2038
2039 spin_lock_irqsave(&info->lock,flags);
2040
2041 if (info->pending_bh & BH_RECEIVE) {
2042 info->pending_bh &= ~BH_RECEIVE;
2043 rc = BH_RECEIVE;
2044 } else if (info->pending_bh & BH_TRANSMIT) {
2045 info->pending_bh &= ~BH_TRANSMIT;
2046 rc = BH_TRANSMIT;
2047 } else if (info->pending_bh & BH_STATUS) {
2048 info->pending_bh &= ~BH_STATUS;
2049 rc = BH_STATUS;
2050 }
2051
2052 if (!rc) {
2053 /* Mark BH routine as complete */
2054 info->bh_running = false;
2055 info->bh_requested = false;
2056 }
2057
2058 spin_unlock_irqrestore(&info->lock,flags);
2059
2060 return rc;
2061 }
2062
2063 /* Perform bottom half processing of work items queued by ISR.
2064 */
2065 static void bh_handler(struct work_struct *work)
2066 {
2067 SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2068 int action;
2069
2070 if (!info)
2071 return;
2072
2073 if ( debug_level >= DEBUG_LEVEL_BH )
2074 printk( "%s(%d):%s bh_handler() entry\n",
2075 __FILE__,__LINE__,info->device_name);
2076
2077 info->bh_running = true;
2078
2079 while((action = bh_action(info)) != 0) {
2080
2081 /* Process work item */
2082 if ( debug_level >= DEBUG_LEVEL_BH )
2083 printk( "%s(%d):%s bh_handler() work item action=%d\n",
2084 __FILE__,__LINE__,info->device_name, action);
2085
2086 switch (action) {
2087
2088 case BH_RECEIVE:
2089 bh_receive(info);
2090 break;
2091 case BH_TRANSMIT:
2092 bh_transmit(info);
2093 break;
2094 case BH_STATUS:
2095 bh_status(info);
2096 break;
2097 default:
2098 /* unknown work item ID */
2099 printk("%s(%d):%s Unknown work item ID=%08X!\n",
2100 __FILE__,__LINE__,info->device_name,action);
2101 break;
2102 }
2103 }
2104
2105 if ( debug_level >= DEBUG_LEVEL_BH )
2106 printk( "%s(%d):%s bh_handler() exit\n",
2107 __FILE__,__LINE__,info->device_name);
2108 }
2109
2110 static void bh_receive(SLMP_INFO *info)
2111 {
2112 if ( debug_level >= DEBUG_LEVEL_BH )
2113 printk( "%s(%d):%s bh_receive()\n",
2114 __FILE__,__LINE__,info->device_name);
2115
2116 while( rx_get_frame(info) );
2117 }
2118
2119 static void bh_transmit(SLMP_INFO *info)
2120 {
2121 struct tty_struct *tty = info->port.tty;
2122
2123 if ( debug_level >= DEBUG_LEVEL_BH )
2124 printk( "%s(%d):%s bh_transmit() entry\n",
2125 __FILE__,__LINE__,info->device_name);
2126
2127 if (tty)
2128 tty_wakeup(tty);
2129 }
2130
2131 static void bh_status(SLMP_INFO *info)
2132 {
2133 if ( debug_level >= DEBUG_LEVEL_BH )
2134 printk( "%s(%d):%s bh_status() entry\n",
2135 __FILE__,__LINE__,info->device_name);
2136
2137 info->ri_chkcount = 0;
2138 info->dsr_chkcount = 0;
2139 info->dcd_chkcount = 0;
2140 info->cts_chkcount = 0;
2141 }
2142
2143 static void isr_timer(SLMP_INFO * info)
2144 {
2145 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2146
2147 /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2148 write_reg(info, IER2, 0);
2149
2150 /* TMCS, Timer Control/Status Register
2151 *
2152 * 07 CMF, Compare match flag (read only) 1=match
2153 * 06 ECMI, CMF Interrupt Enable: 0=disabled
2154 * 05 Reserved, must be 0
2155 * 04 TME, Timer Enable
2156 * 03..00 Reserved, must be 0
2157 *
2158 * 0000 0000
2159 */
2160 write_reg(info, (unsigned char)(timer + TMCS), 0);
2161
2162 info->irq_occurred = true;
2163
2164 if ( debug_level >= DEBUG_LEVEL_ISR )
2165 printk("%s(%d):%s isr_timer()\n",
2166 __FILE__,__LINE__,info->device_name);
2167 }
2168
2169 static void isr_rxint(SLMP_INFO * info)
2170 {
2171 struct tty_struct *tty = info->port.tty;
2172 struct mgsl_icount *icount = &info->icount;
2173 unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2174 unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2175
2176 /* clear status bits */
2177 if (status)
2178 write_reg(info, SR1, status);
2179
2180 if (status2)
2181 write_reg(info, SR2, status2);
2182
2183 if ( debug_level >= DEBUG_LEVEL_ISR )
2184 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2185 __FILE__,__LINE__,info->device_name,status,status2);
2186
2187 if (info->params.mode == MGSL_MODE_ASYNC) {
2188 if (status & BRKD) {
2189 icount->brk++;
2190
2191 /* process break detection if tty control
2192 * is not set to ignore it
2193 */
2194 if ( tty ) {
2195 if (!(status & info->ignore_status_mask1)) {
2196 if (info->read_status_mask1 & BRKD) {
2197 tty_insert_flip_char(tty, 0, TTY_BREAK);
2198 if (info->port.flags & ASYNC_SAK)
2199 do_SAK(tty);
2200 }
2201 }
2202 }
2203 }
2204 }
2205 else {
2206 if (status & (FLGD|IDLD)) {
2207 if (status & FLGD)
2208 info->icount.exithunt++;
2209 else if (status & IDLD)
2210 info->icount.rxidle++;
2211 wake_up_interruptible(&info->event_wait_q);
2212 }
2213 }
2214
2215 if (status & CDCD) {
2216 /* simulate a common modem status change interrupt
2217 * for our handler
2218 */
2219 get_signals( info );
2220 isr_io_pin(info,
2221 MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2222 }
2223 }
2224
2225 /*
2226 * handle async rx data interrupts
2227 */
2228 static void isr_rxrdy(SLMP_INFO * info)
2229 {
2230 u16 status;
2231 unsigned char DataByte;
2232 struct tty_struct *tty = info->port.tty;
2233 struct mgsl_icount *icount = &info->icount;
2234
2235 if ( debug_level >= DEBUG_LEVEL_ISR )
2236 printk("%s(%d):%s isr_rxrdy\n",
2237 __FILE__,__LINE__,info->device_name);
2238
2239 while((status = read_reg(info,CST0)) & BIT0)
2240 {
2241 int flag = 0;
2242 bool over = false;
2243 DataByte = read_reg(info,TRB);
2244
2245 icount->rx++;
2246
2247 if ( status & (PE + FRME + OVRN) ) {
2248 printk("%s(%d):%s rxerr=%04X\n",
2249 __FILE__,__LINE__,info->device_name,status);
2250
2251 /* update error statistics */
2252 if (status & PE)
2253 icount->parity++;
2254 else if (status & FRME)
2255 icount->frame++;
2256 else if (status & OVRN)
2257 icount->overrun++;
2258
2259 /* discard char if tty control flags say so */
2260 if (status & info->ignore_status_mask2)
2261 continue;
2262
2263 status &= info->read_status_mask2;
2264
2265 if ( tty ) {
2266 if (status & PE)
2267 flag = TTY_PARITY;
2268 else if (status & FRME)
2269 flag = TTY_FRAME;
2270 if (status & OVRN) {
2271 /* Overrun is special, since it's
2272 * reported immediately, and doesn't
2273 * affect the current character
2274 */
2275 over = true;
2276 }
2277 }
2278 } /* end of if (error) */
2279
2280 if ( tty ) {
2281 tty_insert_flip_char(tty, DataByte, flag);
2282 if (over)
2283 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2284 }
2285 }
2286
2287 if ( debug_level >= DEBUG_LEVEL_ISR ) {
2288 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2289 __FILE__,__LINE__,info->device_name,
2290 icount->rx,icount->brk,icount->parity,
2291 icount->frame,icount->overrun);
2292 }
2293
2294 if ( tty )
2295 tty_flip_buffer_push(tty);
2296 }
2297
2298 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2299 {
2300 if ( debug_level >= DEBUG_LEVEL_ISR )
2301 printk("%s(%d):%s isr_txeom status=%02x\n",
2302 __FILE__,__LINE__,info->device_name,status);
2303
2304 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2305 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2306 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2307
2308 if (status & UDRN) {
2309 write_reg(info, CMD, TXRESET);
2310 write_reg(info, CMD, TXENABLE);
2311 } else
2312 write_reg(info, CMD, TXBUFCLR);
2313
2314 /* disable and clear tx interrupts */
2315 info->ie0_value &= ~TXRDYE;
2316 info->ie1_value &= ~(IDLE + UDRN);
2317 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2318 write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2319
2320 if ( info->tx_active ) {
2321 if (info->params.mode != MGSL_MODE_ASYNC) {
2322 if (status & UDRN)
2323 info->icount.txunder++;
2324 else if (status & IDLE)
2325 info->icount.txok++;
2326 }
2327
2328 info->tx_active = false;
2329 info->tx_count = info->tx_put = info->tx_get = 0;
2330
2331 del_timer(&info->tx_timer);
2332
2333 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2334 info->serial_signals &= ~SerialSignal_RTS;
2335 info->drop_rts_on_tx_done = false;
2336 set_signals(info);
2337 }
2338
2339 #if SYNCLINK_GENERIC_HDLC
2340 if (info->netcount)
2341 hdlcdev_tx_done(info);
2342 else
2343 #endif
2344 {
2345 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2346 tx_stop(info);
2347 return;
2348 }
2349 info->pending_bh |= BH_TRANSMIT;
2350 }
2351 }
2352 }
2353
2354
2355 /*
2356 * handle tx status interrupts
2357 */
2358 static void isr_txint(SLMP_INFO * info)
2359 {
2360 unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2361
2362 /* clear status bits */
2363 write_reg(info, SR1, status);
2364
2365 if ( debug_level >= DEBUG_LEVEL_ISR )
2366 printk("%s(%d):%s isr_txint status=%02x\n",
2367 __FILE__,__LINE__,info->device_name,status);
2368
2369 if (status & (UDRN + IDLE))
2370 isr_txeom(info, status);
2371
2372 if (status & CCTS) {
2373 /* simulate a common modem status change interrupt
2374 * for our handler
2375 */
2376 get_signals( info );
2377 isr_io_pin(info,
2378 MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2379
2380 }
2381 }
2382
2383 /*
2384 * handle async tx data interrupts
2385 */
2386 static void isr_txrdy(SLMP_INFO * info)
2387 {
2388 if ( debug_level >= DEBUG_LEVEL_ISR )
2389 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2390 __FILE__,__LINE__,info->device_name,info->tx_count);
2391
2392 if (info->params.mode != MGSL_MODE_ASYNC) {
2393 /* disable TXRDY IRQ, enable IDLE IRQ */
2394 info->ie0_value &= ~TXRDYE;
2395 info->ie1_value |= IDLE;
2396 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2397 return;
2398 }
2399
2400 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2401 tx_stop(info);
2402 return;
2403 }
2404
2405 if ( info->tx_count )
2406 tx_load_fifo( info );
2407 else {
2408 info->tx_active = false;
2409 info->ie0_value &= ~TXRDYE;
2410 write_reg(info, IE0, info->ie0_value);
2411 }
2412
2413 if (info->tx_count < WAKEUP_CHARS)
2414 info->pending_bh |= BH_TRANSMIT;
2415 }
2416
2417 static void isr_rxdmaok(SLMP_INFO * info)
2418 {
2419 /* BIT7 = EOT (end of transfer)
2420 * BIT6 = EOM (end of message/frame)
2421 */
2422 unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2423
2424 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2425 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2426
2427 if ( debug_level >= DEBUG_LEVEL_ISR )
2428 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2429 __FILE__,__LINE__,info->device_name,status);
2430
2431 info->pending_bh |= BH_RECEIVE;
2432 }
2433
2434 static void isr_rxdmaerror(SLMP_INFO * info)
2435 {
2436 /* BIT5 = BOF (buffer overflow)
2437 * BIT4 = COF (counter overflow)
2438 */
2439 unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2440
2441 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2442 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2443
2444 if ( debug_level >= DEBUG_LEVEL_ISR )
2445 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2446 __FILE__,__LINE__,info->device_name,status);
2447
2448 info->rx_overflow = true;
2449 info->pending_bh |= BH_RECEIVE;
2450 }
2451
2452 static void isr_txdmaok(SLMP_INFO * info)
2453 {
2454 unsigned char status_reg1 = read_reg(info, SR1);
2455
2456 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2457 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2458 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2459
2460 if ( debug_level >= DEBUG_LEVEL_ISR )
2461 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2462 __FILE__,__LINE__,info->device_name,status_reg1);
2463
2464 /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2465 write_reg16(info, TRC0, 0);
2466 info->ie0_value |= TXRDYE;
2467 write_reg(info, IE0, info->ie0_value);
2468 }
2469
2470 static void isr_txdmaerror(SLMP_INFO * info)
2471 {
2472 /* BIT5 = BOF (buffer overflow)
2473 * BIT4 = COF (counter overflow)
2474 */
2475 unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2476
2477 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2478 write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2479
2480 if ( debug_level >= DEBUG_LEVEL_ISR )
2481 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2482 __FILE__,__LINE__,info->device_name,status);
2483 }
2484
2485 /* handle input serial signal changes
2486 */
2487 static void isr_io_pin( SLMP_INFO *info, u16 status )
2488 {
2489 struct mgsl_icount *icount;
2490
2491 if ( debug_level >= DEBUG_LEVEL_ISR )
2492 printk("%s(%d):isr_io_pin status=%04X\n",
2493 __FILE__,__LINE__,status);
2494
2495 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2496 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2497 icount = &info->icount;
2498 /* update input line counters */
2499 if (status & MISCSTATUS_RI_LATCHED) {
2500 icount->rng++;
2501 if ( status & SerialSignal_RI )
2502 info->input_signal_events.ri_up++;
2503 else
2504 info->input_signal_events.ri_down++;
2505 }
2506 if (status & MISCSTATUS_DSR_LATCHED) {
2507 icount->dsr++;
2508 if ( status & SerialSignal_DSR )
2509 info->input_signal_events.dsr_up++;
2510 else
2511 info->input_signal_events.dsr_down++;
2512 }
2513 if (status & MISCSTATUS_DCD_LATCHED) {
2514 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2515 info->ie1_value &= ~CDCD;
2516 write_reg(info, IE1, info->ie1_value);
2517 }
2518 icount->dcd++;
2519 if (status & SerialSignal_DCD) {
2520 info->input_signal_events.dcd_up++;
2521 } else
2522 info->input_signal_events.dcd_down++;
2523 #if SYNCLINK_GENERIC_HDLC
2524 if (info->netcount) {
2525 if (status & SerialSignal_DCD)
2526 netif_carrier_on(info->netdev);
2527 else
2528 netif_carrier_off(info->netdev);
2529 }
2530 #endif
2531 }
2532 if (status & MISCSTATUS_CTS_LATCHED)
2533 {
2534 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2535 info->ie1_value &= ~CCTS;
2536 write_reg(info, IE1, info->ie1_value);
2537 }
2538 icount->cts++;
2539 if ( status & SerialSignal_CTS )
2540 info->input_signal_events.cts_up++;
2541 else
2542 info->input_signal_events.cts_down++;
2543 }
2544 wake_up_interruptible(&info->status_event_wait_q);
2545 wake_up_interruptible(&info->event_wait_q);
2546
2547 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2548 (status & MISCSTATUS_DCD_LATCHED) ) {
2549 if ( debug_level >= DEBUG_LEVEL_ISR )
2550 printk("%s CD now %s...", info->device_name,
2551 (status & SerialSignal_DCD) ? "on" : "off");
2552 if (status & SerialSignal_DCD)
2553 wake_up_interruptible(&info->port.open_wait);
2554 else {
2555 if ( debug_level >= DEBUG_LEVEL_ISR )
2556 printk("doing serial hangup...");
2557 if (info->port.tty)
2558 tty_hangup(info->port.tty);
2559 }
2560 }
2561
2562 if ( (info->port.flags & ASYNC_CTS_FLOW) &&
2563 (status & MISCSTATUS_CTS_LATCHED) ) {
2564 if ( info->port.tty ) {
2565 if (info->port.tty->hw_stopped) {
2566 if (status & SerialSignal_CTS) {
2567 if ( debug_level >= DEBUG_LEVEL_ISR )
2568 printk("CTS tx start...");
2569 info->port.tty->hw_stopped = 0;
2570 tx_start(info);
2571 info->pending_bh |= BH_TRANSMIT;
2572 return;
2573 }
2574 } else {
2575 if (!(status & SerialSignal_CTS)) {
2576 if ( debug_level >= DEBUG_LEVEL_ISR )
2577 printk("CTS tx stop...");
2578 info->port.tty->hw_stopped = 1;
2579 tx_stop(info);
2580 }
2581 }
2582 }
2583 }
2584 }
2585
2586 info->pending_bh |= BH_STATUS;
2587 }
2588
2589 /* Interrupt service routine entry point.
2590 *
2591 * Arguments:
2592 * irq interrupt number that caused interrupt
2593 * dev_id device ID supplied during interrupt registration
2594 * regs interrupted processor context
2595 */
2596 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2597 {
2598 SLMP_INFO *info = dev_id;
2599 unsigned char status, status0, status1=0;
2600 unsigned char dmastatus, dmastatus0, dmastatus1=0;
2601 unsigned char timerstatus0, timerstatus1=0;
2602 unsigned char shift;
2603 unsigned int i;
2604 unsigned short tmp;
2605
2606 if ( debug_level >= DEBUG_LEVEL_ISR )
2607 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2608 __FILE__, __LINE__, info->irq_level);
2609
2610 spin_lock(&info->lock);
2611
2612 for(;;) {
2613
2614 /* get status for SCA0 (ports 0-1) */
2615 tmp = read_reg16(info, ISR0); /* get ISR0 and ISR1 in one read */
2616 status0 = (unsigned char)tmp;
2617 dmastatus0 = (unsigned char)(tmp>>8);
2618 timerstatus0 = read_reg(info, ISR2);
2619
2620 if ( debug_level >= DEBUG_LEVEL_ISR )
2621 printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2622 __FILE__, __LINE__, info->device_name,
2623 status0, dmastatus0, timerstatus0);
2624
2625 if (info->port_count == 4) {
2626 /* get status for SCA1 (ports 2-3) */
2627 tmp = read_reg16(info->port_array[2], ISR0);
2628 status1 = (unsigned char)tmp;
2629 dmastatus1 = (unsigned char)(tmp>>8);
2630 timerstatus1 = read_reg(info->port_array[2], ISR2);
2631
2632 if ( debug_level >= DEBUG_LEVEL_ISR )
2633 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2634 __FILE__,__LINE__,info->device_name,
2635 status1,dmastatus1,timerstatus1);
2636 }
2637
2638 if (!status0 && !dmastatus0 && !timerstatus0 &&
2639 !status1 && !dmastatus1 && !timerstatus1)
2640 break;
2641
2642 for(i=0; i < info->port_count ; i++) {
2643 if (info->port_array[i] == NULL)
2644 continue;
2645 if (i < 2) {
2646 status = status0;
2647 dmastatus = dmastatus0;
2648 } else {
2649 status = status1;
2650 dmastatus = dmastatus1;
2651 }
2652
2653 shift = i & 1 ? 4 :0;
2654
2655 if (status & BIT0 << shift)
2656 isr_rxrdy(info->port_array[i]);
2657 if (status & BIT1 << shift)
2658 isr_txrdy(info->port_array[i]);
2659 if (status & BIT2 << shift)
2660 isr_rxint(info->port_array[i]);
2661 if (status & BIT3 << shift)
2662 isr_txint(info->port_array[i]);
2663
2664 if (dmastatus & BIT0 << shift)
2665 isr_rxdmaerror(info->port_array[i]);
2666 if (dmastatus & BIT1 << shift)
2667 isr_rxdmaok(info->port_array[i]);
2668 if (dmastatus & BIT2 << shift)
2669 isr_txdmaerror(info->port_array[i]);
2670 if (dmastatus & BIT3 << shift)
2671 isr_txdmaok(info->port_array[i]);
2672 }
2673
2674 if (timerstatus0 & (BIT5 | BIT4))
2675 isr_timer(info->port_array[0]);
2676 if (timerstatus0 & (BIT7 | BIT6))
2677 isr_timer(info->port_array[1]);
2678 if (timerstatus1 & (BIT5 | BIT4))
2679 isr_timer(info->port_array[2]);
2680 if (timerstatus1 & (BIT7 | BIT6))
2681 isr_timer(info->port_array[3]);
2682 }
2683
2684 for(i=0; i < info->port_count ; i++) {
2685 SLMP_INFO * port = info->port_array[i];
2686
2687 /* Request bottom half processing if there's something
2688 * for it to do and the bh is not already running.
2689 *
2690 * Note: startup adapter diags require interrupts.
2691 * do not request bottom half processing if the
2692 * device is not open in a normal mode.
2693 */
2694 if ( port && (port->port.count || port->netcount) &&
2695 port->pending_bh && !port->bh_running &&
2696 !port->bh_requested ) {
2697 if ( debug_level >= DEBUG_LEVEL_ISR )
2698 printk("%s(%d):%s queueing bh task.\n",
2699 __FILE__,__LINE__,port->device_name);
2700 schedule_work(&port->task);
2701 port->bh_requested = true;
2702 }
2703 }
2704
2705 spin_unlock(&info->lock);
2706
2707 if ( debug_level >= DEBUG_LEVEL_ISR )
2708 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2709 __FILE__, __LINE__, info->irq_level);
2710 return IRQ_HANDLED;
2711 }
2712
2713 /* Initialize and start device.
2714 */
2715 static int startup(SLMP_INFO * info)
2716 {
2717 if ( debug_level >= DEBUG_LEVEL_INFO )
2718 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2719
2720 if (info->port.flags & ASYNC_INITIALIZED)
2721 return 0;
2722
2723 if (!info->tx_buf) {
2724 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2725 if (!info->tx_buf) {
2726 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2727 __FILE__,__LINE__,info->device_name);
2728 return -ENOMEM;
2729 }
2730 }
2731
2732 info->pending_bh = 0;
2733
2734 memset(&info->icount, 0, sizeof(info->icount));
2735
2736 /* program hardware for current parameters */
2737 reset_port(info);
2738
2739 change_params(info);
2740
2741 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2742
2743 if (info->port.tty)
2744 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2745
2746 info->port.flags |= ASYNC_INITIALIZED;
2747
2748 return 0;
2749 }
2750
2751 /* Called by close() and hangup() to shutdown hardware
2752 */
2753 static void shutdown(SLMP_INFO * info)
2754 {
2755 unsigned long flags;
2756
2757 if (!(info->port.flags & ASYNC_INITIALIZED))
2758 return;
2759
2760 if (debug_level >= DEBUG_LEVEL_INFO)
2761 printk("%s(%d):%s synclinkmp_shutdown()\n",
2762 __FILE__,__LINE__, info->device_name );
2763
2764 /* clear status wait queue because status changes */
2765 /* can't happen after shutting down the hardware */
2766 wake_up_interruptible(&info->status_event_wait_q);
2767 wake_up_interruptible(&info->event_wait_q);
2768
2769 del_timer(&info->tx_timer);
2770 del_timer(&info->status_timer);
2771
2772 kfree(info->tx_buf);
2773 info->tx_buf = NULL;
2774
2775 spin_lock_irqsave(&info->lock,flags);
2776
2777 reset_port(info);
2778
2779 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2780 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2781 set_signals(info);
2782 }
2783
2784 spin_unlock_irqrestore(&info->lock,flags);
2785
2786 if (info->port.tty)
2787 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2788
2789 info->port.flags &= ~ASYNC_INITIALIZED;
2790 }
2791
2792 static void program_hw(SLMP_INFO *info)
2793 {
2794 unsigned long flags;
2795
2796 spin_lock_irqsave(&info->lock,flags);
2797
2798 rx_stop(info);
2799 tx_stop(info);
2800
2801 info->tx_count = info->tx_put = info->tx_get = 0;
2802
2803 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2804 hdlc_mode(info);
2805 else
2806 async_mode(info);
2807
2808 set_signals(info);
2809
2810 info->dcd_chkcount = 0;
2811 info->cts_chkcount = 0;
2812 info->ri_chkcount = 0;
2813 info->dsr_chkcount = 0;
2814
2815 info->ie1_value |= (CDCD|CCTS);
2816 write_reg(info, IE1, info->ie1_value);
2817
2818 get_signals(info);
2819
2820 if (info->netcount || (info->port.tty && info->port.tty->termios->c_cflag & CREAD) )
2821 rx_start(info);
2822
2823 spin_unlock_irqrestore(&info->lock,flags);
2824 }
2825
2826 /* Reconfigure adapter based on new parameters
2827 */
2828 static void change_params(SLMP_INFO *info)
2829 {
2830 unsigned cflag;
2831 int bits_per_char;
2832
2833 if (!info->port.tty || !info->port.tty->termios)
2834 return;
2835
2836 if (debug_level >= DEBUG_LEVEL_INFO)
2837 printk("%s(%d):%s change_params()\n",
2838 __FILE__,__LINE__, info->device_name );
2839
2840 cflag = info->port.tty->termios->c_cflag;
2841
2842 /* if B0 rate (hangup) specified then negate DTR and RTS */
2843 /* otherwise assert DTR and RTS */
2844 if (cflag & CBAUD)
2845 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2846 else
2847 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2848
2849 /* byte size and parity */
2850
2851 switch (cflag & CSIZE) {
2852 case CS5: info->params.data_bits = 5; break;
2853 case CS6: info->params.data_bits = 6; break;
2854 case CS7: info->params.data_bits = 7; break;
2855 case CS8: info->params.data_bits = 8; break;
2856 /* Never happens, but GCC is too dumb to figure it out */
2857 default: info->params.data_bits = 7; break;
2858 }
2859
2860 if (cflag & CSTOPB)
2861 info->params.stop_bits = 2;
2862 else
2863 info->params.stop_bits = 1;
2864
2865 info->params.parity = ASYNC_PARITY_NONE;
2866 if (cflag & PARENB) {
2867 if (cflag & PARODD)
2868 info->params.parity = ASYNC_PARITY_ODD;
2869 else
2870 info->params.parity = ASYNC_PARITY_EVEN;
2871 #ifdef CMSPAR
2872 if (cflag & CMSPAR)
2873 info->params.parity = ASYNC_PARITY_SPACE;
2874 #endif
2875 }
2876
2877 /* calculate number of jiffies to transmit a full
2878 * FIFO (32 bytes) at specified data rate
2879 */
2880 bits_per_char = info->params.data_bits +
2881 info->params.stop_bits + 1;
2882
2883 /* if port data rate is set to 460800 or less then
2884 * allow tty settings to override, otherwise keep the
2885 * current data rate.
2886 */
2887 if (info->params.data_rate <= 460800) {
2888 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2889 }
2890
2891 if ( info->params.data_rate ) {
2892 info->timeout = (32*HZ*bits_per_char) /
2893 info->params.data_rate;
2894 }
2895 info->timeout += HZ/50; /* Add .02 seconds of slop */
2896
2897 if (cflag & CRTSCTS)
2898 info->port.flags |= ASYNC_CTS_FLOW;
2899 else
2900 info->port.flags &= ~ASYNC_CTS_FLOW;
2901
2902 if (cflag & CLOCAL)
2903 info->port.flags &= ~ASYNC_CHECK_CD;
2904 else
2905 info->port.flags |= ASYNC_CHECK_CD;
2906
2907 /* process tty input control flags */
2908
2909 info->read_status_mask2 = OVRN;
2910 if (I_INPCK(info->port.tty))
2911 info->read_status_mask2 |= PE | FRME;
2912 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2913 info->read_status_mask1 |= BRKD;
2914 if (I_IGNPAR(info->port.tty))
2915 info->ignore_status_mask2 |= PE | FRME;
2916 if (I_IGNBRK(info->port.tty)) {
2917 info->ignore_status_mask1 |= BRKD;
2918 /* If ignoring parity and break indicators, ignore
2919 * overruns too. (For real raw support).
2920 */
2921 if (I_IGNPAR(info->port.tty))
2922 info->ignore_status_mask2 |= OVRN;
2923 }
2924
2925 program_hw(info);
2926 }
2927
2928 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2929 {
2930 int err;
2931
2932 if (debug_level >= DEBUG_LEVEL_INFO)
2933 printk("%s(%d):%s get_params()\n",
2934 __FILE__,__LINE__, info->device_name);
2935
2936 if (!user_icount) {
2937 memset(&info->icount, 0, sizeof(info->icount));
2938 } else {
2939 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2940 if (err)
2941 return -EFAULT;
2942 }
2943
2944 return 0;
2945 }
2946
2947 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2948 {
2949 int err;
2950 if (debug_level >= DEBUG_LEVEL_INFO)
2951 printk("%s(%d):%s get_params()\n",
2952 __FILE__,__LINE__, info->device_name);
2953
2954 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2955 if (err) {
2956 if ( debug_level >= DEBUG_LEVEL_INFO )
2957 printk( "%s(%d):%s get_params() user buffer copy failed\n",
2958 __FILE__,__LINE__,info->device_name);
2959 return -EFAULT;
2960 }
2961
2962 return 0;
2963 }
2964
2965 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2966 {
2967 unsigned long flags;
2968 MGSL_PARAMS tmp_params;
2969 int err;
2970
2971 if (debug_level >= DEBUG_LEVEL_INFO)
2972 printk("%s(%d):%s set_params\n",
2973 __FILE__,__LINE__,info->device_name );
2974 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2975 if (err) {
2976 if ( debug_level >= DEBUG_LEVEL_INFO )
2977 printk( "%s(%d):%s set_params() user buffer copy failed\n",
2978 __FILE__,__LINE__,info->device_name);
2979 return -EFAULT;
2980 }
2981
2982 spin_lock_irqsave(&info->lock,flags);
2983 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2984 spin_unlock_irqrestore(&info->lock,flags);
2985
2986 change_params(info);
2987
2988 return 0;
2989 }
2990
2991 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2992 {
2993 int err;
2994
2995 if (debug_level >= DEBUG_LEVEL_INFO)
2996 printk("%s(%d):%s get_txidle()=%d\n",
2997 __FILE__,__LINE__, info->device_name, info->idle_mode);
2998
2999 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
3000 if (err) {
3001 if ( debug_level >= DEBUG_LEVEL_INFO )
3002 printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3003 __FILE__,__LINE__,info->device_name);
3004 return -EFAULT;
3005 }
3006
3007 return 0;
3008 }
3009
3010 static int set_txidle(SLMP_INFO * info, int idle_mode)
3011 {
3012 unsigned long flags;
3013
3014 if (debug_level >= DEBUG_LEVEL_INFO)
3015 printk("%s(%d):%s set_txidle(%d)\n",
3016 __FILE__,__LINE__,info->device_name, idle_mode );
3017
3018 spin_lock_irqsave(&info->lock,flags);
3019 info->idle_mode = idle_mode;
3020 tx_set_idle( info );
3021 spin_unlock_irqrestore(&info->lock,flags);
3022 return 0;
3023 }
3024
3025 static int tx_enable(SLMP_INFO * info, int enable)
3026 {
3027 unsigned long flags;
3028
3029 if (debug_level >= DEBUG_LEVEL_INFO)
3030 printk("%s(%d):%s tx_enable(%d)\n",
3031 __FILE__,__LINE__,info->device_name, enable);
3032
3033 spin_lock_irqsave(&info->lock,flags);
3034 if ( enable ) {
3035 if ( !info->tx_enabled ) {
3036 tx_start(info);
3037 }
3038 } else {
3039 if ( info->tx_enabled )
3040 tx_stop(info);
3041 }
3042 spin_unlock_irqrestore(&info->lock,flags);
3043 return 0;
3044 }
3045
3046 /* abort send HDLC frame
3047 */
3048 static int tx_abort(SLMP_INFO * info)
3049 {
3050 unsigned long flags;
3051
3052 if (debug_level >= DEBUG_LEVEL_INFO)
3053 printk("%s(%d):%s tx_abort()\n",
3054 __FILE__,__LINE__,info->device_name);
3055
3056 spin_lock_irqsave(&info->lock,flags);
3057 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3058 info->ie1_value &= ~UDRN;
3059 info->ie1_value |= IDLE;
3060 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
3061 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
3062
3063 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
3064 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3065
3066 write_reg(info, CMD, TXABORT);
3067 }
3068 spin_unlock_irqrestore(&info->lock,flags);
3069 return 0;
3070 }
3071
3072 static int rx_enable(SLMP_INFO * info, int enable)
3073 {
3074 unsigned long flags;
3075
3076 if (debug_level >= DEBUG_LEVEL_INFO)
3077 printk("%s(%d):%s rx_enable(%d)\n",
3078 __FILE__,__LINE__,info->device_name,enable);
3079
3080 spin_lock_irqsave(&info->lock,flags);
3081 if ( enable ) {
3082 if ( !info->rx_enabled )
3083 rx_start(info);
3084 } else {
3085 if ( info->rx_enabled )
3086 rx_stop(info);
3087 }
3088 spin_unlock_irqrestore(&info->lock,flags);
3089 return 0;
3090 }
3091
3092 /* wait for specified event to occur
3093 */
3094 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3095 {
3096 unsigned long flags;
3097 int s;
3098 int rc=0;
3099 struct mgsl_icount cprev, cnow;
3100 int events;
3101 int mask;
3102 struct _input_signal_events oldsigs, newsigs;
3103 DECLARE_WAITQUEUE(wait, current);
3104
3105 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3106 if (rc) {
3107 return -EFAULT;
3108 }
3109
3110 if (debug_level >= DEBUG_LEVEL_INFO)
3111 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3112 __FILE__,__LINE__,info->device_name,mask);
3113
3114 spin_lock_irqsave(&info->lock,flags);
3115
3116 /* return immediately if state matches requested events */
3117 get_signals(info);
3118 s = info->serial_signals;
3119
3120 events = mask &
3121 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3122 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3123 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3124 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3125 if (events) {
3126 spin_unlock_irqrestore(&info->lock,flags);
3127 goto exit;
3128 }
3129
3130 /* save current irq counts */
3131 cprev = info->icount;
3132 oldsigs = info->input_signal_events;
3133
3134 /* enable hunt and idle irqs if needed */
3135 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3136 unsigned char oldval = info->ie1_value;
3137 unsigned char newval = oldval +
3138 (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3139 (mask & MgslEvent_IdleReceived ? IDLD:0);
3140 if ( oldval != newval ) {
3141 info->ie1_value = newval;
3142 write_reg(info, IE1, info->ie1_value);
3143 }
3144 }
3145
3146 set_current_state(TASK_INTERRUPTIBLE);
3147 add_wait_queue(&info->event_wait_q, &wait);
3148
3149 spin_unlock_irqrestore(&info->lock,flags);
3150
3151 for(;;) {
3152 schedule();
3153 if (signal_pending(current)) {
3154 rc = -ERESTARTSYS;
3155 break;
3156 }
3157
3158 /* get current irq counts */
3159 spin_lock_irqsave(&info->lock,flags);
3160 cnow = info->icount;
3161 newsigs = info->input_signal_events;
3162 set_current_state(TASK_INTERRUPTIBLE);
3163 spin_unlock_irqrestore(&info->lock,flags);
3164
3165 /* if no change, wait aborted for some reason */
3166 if (newsigs.dsr_up == oldsigs.dsr_up &&
3167 newsigs.dsr_down == oldsigs.dsr_down &&
3168 newsigs.dcd_up == oldsigs.dcd_up &&
3169 newsigs.dcd_down == oldsigs.dcd_down &&
3170 newsigs.cts_up == oldsigs.cts_up &&
3171 newsigs.cts_down == oldsigs.cts_down &&
3172 newsigs.ri_up == oldsigs.ri_up &&
3173 newsigs.ri_down == oldsigs.ri_down &&
3174 cnow.exithunt == cprev.exithunt &&
3175 cnow.rxidle == cprev.rxidle) {
3176 rc = -EIO;
3177 break;
3178 }
3179
3180 events = mask &
3181 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
3182 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3183 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
3184 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3185 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
3186 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3187 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
3188 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
3189 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
3190 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
3191 if (events)
3192 break;
3193
3194 cprev = cnow;
3195 oldsigs = newsigs;
3196 }
3197
3198 remove_wait_queue(&info->event_wait_q, &wait);
3199 set_current_state(TASK_RUNNING);
3200
3201
3202 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3203 spin_lock_irqsave(&info->lock,flags);
3204 if (!waitqueue_active(&info->event_wait_q)) {
3205 /* disable enable exit hunt mode/idle rcvd IRQs */
3206 info->ie1_value &= ~(FLGD|IDLD);
3207 write_reg(info, IE1, info->ie1_value);
3208 }
3209 spin_unlock_irqrestore(&info->lock,flags);
3210 }
3211 exit:
3212 if ( rc == 0 )
3213 PUT_USER(rc, events, mask_ptr);
3214
3215 return rc;
3216 }
3217
3218 static int modem_input_wait(SLMP_INFO *info,int arg)
3219 {
3220 unsigned long flags;
3221 int rc;
3222 struct mgsl_icount cprev, cnow;
3223 DECLARE_WAITQUEUE(wait, current);
3224
3225 /* save current irq counts */
3226 spin_lock_irqsave(&info->lock,flags);
3227 cprev = info->icount;
3228 add_wait_queue(&info->status_event_wait_q, &wait);
3229 set_current_state(TASK_INTERRUPTIBLE);
3230 spin_unlock_irqrestore(&info->lock,flags);
3231
3232 for(;;) {
3233 schedule();
3234 if (signal_pending(current)) {
3235 rc = -ERESTARTSYS;
3236 break;
3237 }
3238
3239 /* get new irq counts */
3240 spin_lock_irqsave(&info->lock,flags);
3241 cnow = info->icount;
3242 set_current_state(TASK_INTERRUPTIBLE);
3243 spin_unlock_irqrestore(&info->lock,flags);
3244
3245 /* if no change, wait aborted for some reason */
3246 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3247 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3248 rc = -EIO;
3249 break;
3250 }
3251
3252 /* check for change in caller specified modem input */
3253 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3254 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3255 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3256 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3257 rc = 0;
3258 break;
3259 }
3260
3261 cprev = cnow;
3262 }
3263 remove_wait_queue(&info->status_event_wait_q, &wait);
3264 set_current_state(TASK_RUNNING);
3265 return rc;
3266 }
3267
3268 /* return the state of the serial control and status signals
3269 */
3270 static int tiocmget(struct tty_struct *tty, struct file *file)
3271 {
3272 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3273 unsigned int result;
3274 unsigned long flags;
3275
3276 spin_lock_irqsave(&info->lock,flags);
3277 get_signals(info);
3278 spin_unlock_irqrestore(&info->lock,flags);
3279
3280 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3281 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3282 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3283 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3284 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3285 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3286
3287 if (debug_level >= DEBUG_LEVEL_INFO)
3288 printk("%s(%d):%s tiocmget() value=%08X\n",
3289 __FILE__,__LINE__, info->device_name, result );
3290 return result;
3291 }
3292
3293 /* set modem control signals (DTR/RTS)
3294 */
3295 static int tiocmset(struct tty_struct *tty, struct file *file,
3296 unsigned int set, unsigned int clear)
3297 {
3298 SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3299 unsigned long flags;
3300
3301 if (debug_level >= DEBUG_LEVEL_INFO)
3302 printk("%s(%d):%s tiocmset(%x,%x)\n",
3303 __FILE__,__LINE__,info->device_name, set, clear);
3304
3305 if (set & TIOCM_RTS)
3306 info->serial_signals |= SerialSignal_RTS;
3307 if (set & TIOCM_DTR)
3308 info->serial_signals |= SerialSignal_DTR;
3309 if (clear & TIOCM_RTS)
3310 info->serial_signals &= ~SerialSignal_RTS;
3311 if (clear & TIOCM_DTR)
3312 info->serial_signals &= ~SerialSignal_DTR;
3313
3314 spin_lock_irqsave(&info->lock,flags);
3315 set_signals(info);
3316 spin_unlock_irqrestore(&info->lock,flags);
3317
3318 return 0;
3319 }
3320
3321
3322
3323 /* Block the current process until the specified port is ready to open.
3324 */
3325 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3326 SLMP_INFO *info)
3327 {
3328 DECLARE_WAITQUEUE(wait, current);
3329 int retval;
3330 bool do_clocal = false;
3331 bool extra_count = false;
3332 unsigned long flags;
3333
3334 if (debug_level >= DEBUG_LEVEL_INFO)
3335 printk("%s(%d):%s block_til_ready()\n",
3336 __FILE__,__LINE__, tty->driver->name );
3337
3338 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3339 /* nonblock mode is set or port is not enabled */
3340 /* just verify that callout device is not active */
3341 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3342 return 0;
3343 }
3344
3345 if (tty->termios->c_cflag & CLOCAL)
3346 do_clocal = true;
3347
3348 /* Wait for carrier detect and the line to become
3349 * free (i.e., not in use by the callout). While we are in
3350 * this loop, info->port.count is dropped by one, so that
3351 * close() knows when to free things. We restore it upon
3352 * exit, either normal or abnormal.
3353 */
3354
3355 retval = 0;
3356 add_wait_queue(&info->port.open_wait, &wait);
3357
3358 if (debug_level >= DEBUG_LEVEL_INFO)
3359 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3360 __FILE__,__LINE__, tty->driver->name, info->port.count );
3361
3362 spin_lock_irqsave(&info->lock, flags);
3363 if (!tty_hung_up_p(filp)) {
3364 extra_count = true;
3365 info->port.count--;
3366 }
3367 spin_unlock_irqrestore(&info->lock, flags);
3368 info->port.blocked_open++;
3369
3370 while (1) {
3371 if ((tty->termios->c_cflag & CBAUD)) {
3372 spin_lock_irqsave(&info->lock,flags);
3373 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3374 set_signals(info);
3375 spin_unlock_irqrestore(&info->lock,flags);
3376 }
3377
3378 set_current_state(TASK_INTERRUPTIBLE);
3379
3380 if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
3381 retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
3382 -EAGAIN : -ERESTARTSYS;
3383 break;
3384 }
3385
3386 spin_lock_irqsave(&info->lock,flags);
3387 get_signals(info);
3388 spin_unlock_irqrestore(&info->lock,flags);
3389
3390 if (!(info->port.flags & ASYNC_CLOSING) &&
3391 (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3392 break;
3393 }
3394
3395 if (signal_pending(current)) {
3396 retval = -ERESTARTSYS;
3397 break;
3398 }
3399
3400 if (debug_level >= DEBUG_LEVEL_INFO)
3401 printk("%s(%d):%s block_til_ready() count=%d\n",
3402 __FILE__,__LINE__, tty->driver->name, info->port.count );
3403
3404 schedule();
3405 }
3406
3407 set_current_state(TASK_RUNNING);
3408 remove_wait_queue(&info->port.open_wait, &wait);
3409
3410 if (extra_count)
3411 info->port.count++;
3412 info->port.blocked_open--;
3413
3414 if (debug_level >= DEBUG_LEVEL_INFO)
3415 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3416 __FILE__,__LINE__, tty->driver->name, info->port.count );
3417
3418 if (!retval)
3419 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3420
3421 return retval;
3422 }
3423
3424 static int alloc_dma_bufs(SLMP_INFO *info)
3425 {
3426 unsigned short BuffersPerFrame;
3427 unsigned short BufferCount;
3428
3429 // Force allocation to start at 64K boundary for each port.
3430 // This is necessary because *all* buffer descriptors for a port
3431 // *must* be in the same 64K block. All descriptors on a port
3432 // share a common 'base' address (upper 8 bits of 24 bits) programmed
3433 // into the CBP register.
3434 info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3435
3436 /* Calculate the number of DMA buffers necessary to hold the */
3437 /* largest allowable frame size. Note: If the max frame size is */
3438 /* not an even multiple of the DMA buffer size then we need to */
3439 /* round the buffer count per frame up one. */
3440
3441 BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3442 if ( info->max_frame_size % SCABUFSIZE )
3443 BuffersPerFrame++;
3444
3445 /* calculate total number of data buffers (SCABUFSIZE) possible
3446 * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3447 * for the descriptor list (BUFFERLISTSIZE).
3448 */
3449 BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3450
3451 /* limit number of buffers to maximum amount of descriptors */
3452 if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3453 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3454
3455 /* use enough buffers to transmit one max size frame */
3456 info->tx_buf_count = BuffersPerFrame + 1;
3457
3458 /* never use more than half the available buffers for transmit */
3459 if (info->tx_buf_count > (BufferCount/2))
3460 info->tx_buf_count = BufferCount/2;
3461
3462 if (info->tx_buf_count > SCAMAXDESC)
3463 info->tx_buf_count = SCAMAXDESC;
3464
3465 /* use remaining buffers for receive */
3466 info->rx_buf_count = BufferCount - info->tx_buf_count;
3467
3468 if (info->rx_buf_count > SCAMAXDESC)
3469 info->rx_buf_count = SCAMAXDESC;
3470
3471 if ( debug_level >= DEBUG_LEVEL_INFO )
3472 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3473 __FILE__,__LINE__, info->device_name,
3474 info->tx_buf_count,info->rx_buf_count);
3475
3476 if ( alloc_buf_list( info ) < 0 ||
3477 alloc_frame_bufs(info,
3478 info->rx_buf_list,
3479 info->rx_buf_list_ex,
3480 info->rx_buf_count) < 0 ||
3481 alloc_frame_bufs(info,
3482 info->tx_buf_list,
3483 info->tx_buf_list_ex,
3484 info->tx_buf_count) < 0 ||
3485 alloc_tmp_rx_buf(info) < 0 ) {
3486 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3487 __FILE__,__LINE__, info->device_name);
3488 return -ENOMEM;
3489 }
3490
3491 rx_reset_buffers( info );
3492
3493 return 0;
3494 }
3495
3496 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3497 */
3498 static int alloc_buf_list(SLMP_INFO *info)
3499 {
3500 unsigned int i;
3501
3502 /* build list in adapter shared memory */
3503 info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3504 info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3505 info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3506
3507 memset(info->buffer_list, 0, BUFFERLISTSIZE);
3508
3509 /* Save virtual address pointers to the receive and */
3510 /* transmit buffer lists. (Receive 1st). These pointers will */
3511 /* be used by the processor to access the lists. */
3512 info->rx_buf_list = (SCADESC *)info->buffer_list;
3513
3514 info->tx_buf_list = (SCADESC *)info->buffer_list;
3515 info->tx_buf_list += info->rx_buf_count;
3516
3517 /* Build links for circular buffer entry lists (tx and rx)
3518 *
3519 * Note: links are physical addresses read by the SCA device
3520 * to determine the next buffer entry to use.
3521 */
3522
3523 for ( i = 0; i < info->rx_buf_count; i++ ) {
3524 /* calculate and store physical address of this buffer entry */
3525 info->rx_buf_list_ex[i].phys_entry =
3526 info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3527
3528 /* calculate and store physical address of */
3529 /* next entry in cirular list of entries */
3530 info->rx_buf_list[i].next = info->buffer_list_phys;
3531 if ( i < info->rx_buf_count - 1 )
3532 info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3533
3534 info->rx_buf_list[i].length = SCABUFSIZE;
3535 }
3536
3537 for ( i = 0; i < info->tx_buf_count; i++ ) {
3538 /* calculate and store physical address of this buffer entry */
3539 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3540 ((info->rx_buf_count + i) * sizeof(SCADESC));
3541
3542 /* calculate and store physical address of */
3543 /* next entry in cirular list of entries */
3544
3545 info->tx_buf_list[i].next = info->buffer_list_phys +
3546 info->rx_buf_count * sizeof(SCADESC);
3547
3548 if ( i < info->tx_buf_count - 1 )
3549 info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3550 }
3551
3552 return 0;
3553 }
3554
3555 /* Allocate the frame DMA buffers used by the specified buffer list.
3556 */
3557 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3558 {
3559 int i;
3560 unsigned long phys_addr;
3561
3562 for ( i = 0; i < count; i++ ) {
3563 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3564 phys_addr = info->port_array[0]->last_mem_alloc;
3565 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3566
3567 buf_list[i].buf_ptr = (unsigned short)phys_addr;
3568 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3569 }
3570
3571 return 0;
3572 }
3573
3574 static void free_dma_bufs(SLMP_INFO *info)
3575 {
3576 info->buffer_list = NULL;
3577 info->rx_buf_list = NULL;
3578 info->tx_buf_list = NULL;
3579 }
3580
3581 /* allocate buffer large enough to hold max_frame_size.
3582 * This buffer is used to pass an assembled frame to the line discipline.
3583 */
3584 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3585 {
3586 info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3587 if (info->tmp_rx_buf == NULL)
3588 return -ENOMEM;
3589 return 0;
3590 }
3591
3592 static void free_tmp_rx_buf(SLMP_INFO *info)
3593 {
3594 kfree(info->tmp_rx_buf);
3595 info->tmp_rx_buf = NULL;
3596 }
3597
3598 static int claim_resources(SLMP_INFO *info)
3599 {
3600 if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3601 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3602 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3603 info->init_error = DiagStatus_AddressConflict;
3604 goto errout;
3605 }
3606 else
3607 info->shared_mem_requested = true;
3608
3609 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3610 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3611 __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3612 info->init_error = DiagStatus_AddressConflict;
3613 goto errout;
3614 }
3615 else
3616 info->lcr_mem_requested = true;
3617
3618 if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3619 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3620 __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3621 info->init_error = DiagStatus_AddressConflict;
3622 goto errout;
3623 }
3624 else
3625 info->sca_base_requested = true;
3626
3627 if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3628 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3629 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3630 info->init_error = DiagStatus_AddressConflict;
3631 goto errout;
3632 }
3633 else
3634 info->sca_statctrl_requested = true;
3635
3636 info->memory_base = ioremap_nocache(info->phys_memory_base,
3637 SCA_MEM_SIZE);
3638 if (!info->memory_base) {
3639 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3640 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3641 info->init_error = DiagStatus_CantAssignPciResources;
3642 goto errout;
3643 }
3644
3645 info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3646 if (!info->lcr_base) {
3647 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3648 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3649 info->init_error = DiagStatus_CantAssignPciResources;
3650 goto errout;
3651 }
3652 info->lcr_base += info->lcr_offset;
3653
3654 info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3655 if (!info->sca_base) {
3656 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3657 __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3658 info->init_error = DiagStatus_CantAssignPciResources;
3659 goto errout;
3660 }
3661 info->sca_base += info->sca_offset;
3662
3663 info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3664 PAGE_SIZE);
3665 if (!info->statctrl_base) {
3666 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3667 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3668 info->init_error = DiagStatus_CantAssignPciResources;
3669 goto errout;
3670 }
3671 info->statctrl_base += info->statctrl_offset;
3672
3673 if ( !memory_test(info) ) {
3674 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3675 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3676 info->init_error = DiagStatus_MemoryError;
3677 goto errout;
3678 }
3679
3680 return 0;
3681
3682 errout:
3683 release_resources( info );
3684 return -ENODEV;
3685 }
3686
3687 static void release_resources(SLMP_INFO *info)
3688 {
3689 if ( debug_level >= DEBUG_LEVEL_INFO )
3690 printk( "%s(%d):%s release_resources() entry\n",
3691 __FILE__,__LINE__,info->device_name );
3692
3693 if ( info->irq_requested ) {
3694 free_irq(info->irq_level, info);
3695 info->irq_requested = false;
3696 }
3697
3698 if ( info->shared_mem_requested ) {
3699 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3700 info->shared_mem_requested = false;
3701 }
3702 if ( info->lcr_mem_requested ) {
3703 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3704 info->lcr_mem_requested = false;
3705 }
3706 if ( info->sca_base_requested ) {
3707 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3708 info->sca_base_requested = false;
3709 }
3710 if ( info->sca_statctrl_requested ) {
3711 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3712 info->sca_statctrl_requested = false;
3713 }
3714
3715 if (info->memory_base){
3716 iounmap(info->memory_base);
3717 info->memory_base = NULL;
3718 }
3719
3720 if (info->sca_base) {
3721 iounmap(info->sca_base - info->sca_offset);
3722 info->sca_base=NULL;
3723 }
3724
3725 if (info->statctrl_base) {
3726 iounmap(info->statctrl_base - info->statctrl_offset);
3727 info->statctrl_base=NULL;
3728 }
3729
3730 if (info->lcr_base){
3731 iounmap(info->lcr_base - info->lcr_offset);
3732 info->lcr_base = NULL;
3733 }
3734
3735 if ( debug_level >= DEBUG_LEVEL_INFO )
3736 printk( "%s(%d):%s release_resources() exit\n",
3737 __FILE__,__LINE__,info->device_name );
3738 }
3739
3740 /* Add the specified device instance data structure to the
3741 * global linked list of devices and increment the device count.
3742 */
3743 static void add_device(SLMP_INFO *info)
3744 {
3745 info->next_device = NULL;
3746 info->line = synclinkmp_device_count;
3747 sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3748
3749 if (info->line < MAX_DEVICES) {
3750 if (maxframe[info->line])
3751 info->max_frame_size = maxframe[info->line];
3752 }
3753
3754 synclinkmp_device_count++;
3755
3756 if ( !synclinkmp_device_list )
3757 synclinkmp_device_list = info;
3758 else {
3759 SLMP_INFO *current_dev = synclinkmp_device_list;
3760 while( current_dev->next_device )
3761 current_dev = current_dev->next_device;
3762 current_dev->next_device = info;
3763 }
3764
3765 if ( info->max_frame_size < 4096 )
3766 info->max_frame_size = 4096;
3767 else if ( info->max_frame_size > 65535 )
3768 info->max_frame_size = 65535;
3769
3770 printk( "SyncLink MultiPort %s: "
3771 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3772 info->device_name,
3773 info->phys_sca_base,
3774 info->phys_memory_base,
3775 info->phys_statctrl_base,
3776 info->phys_lcr_base,
3777 info->irq_level,
3778 info->max_frame_size );
3779
3780 #if SYNCLINK_GENERIC_HDLC
3781 hdlcdev_init(info);
3782 #endif
3783 }
3784
3785 /* Allocate and initialize a device instance structure
3786 *
3787 * Return Value: pointer to SLMP_INFO if success, otherwise NULL
3788 */
3789 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3790 {
3791 SLMP_INFO *info;
3792
3793 info = kzalloc(sizeof(SLMP_INFO),
3794 GFP_KERNEL);
3795
3796 if (!info) {
3797 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3798 __FILE__,__LINE__, adapter_num, port_num);
3799 } else {
3800 tty_port_init(&info->port);
3801 info->magic = MGSL_MAGIC;
3802 INIT_WORK(&info->task, bh_handler);
3803 info->max_frame_size = 4096;
3804 info->port.close_delay = 5*HZ/10;
3805 info->port.closing_wait = 30*HZ;
3806 init_waitqueue_head(&info->status_event_wait_q);
3807 init_waitqueue_head(&info->event_wait_q);
3808 spin_lock_init(&info->netlock);
3809 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3810 info->idle_mode = HDLC_TXIDLE_FLAGS;
3811 info->adapter_num = adapter_num;
3812 info->port_num = port_num;
3813
3814 /* Copy configuration info to device instance data */
3815 info->irq_level = pdev->irq;
3816 info->phys_lcr_base = pci_resource_start(pdev,0);
3817 info->phys_sca_base = pci_resource_start(pdev,2);
3818 info->phys_memory_base = pci_resource_start(pdev,3);
3819 info->phys_statctrl_base = pci_resource_start(pdev,4);
3820
3821 /* Because veremap only works on page boundaries we must map
3822 * a larger area than is actually implemented for the LCR
3823 * memory range. We map a full page starting at the page boundary.
3824 */
3825 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
3826 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3827
3828 info->sca_offset = info->phys_sca_base & (PAGE_SIZE-1);
3829 info->phys_sca_base &= ~(PAGE_SIZE-1);
3830
3831 info->statctrl_offset = info->phys_statctrl_base & (PAGE_SIZE-1);
3832 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3833
3834 info->bus_type = MGSL_BUS_TYPE_PCI;
3835 info->irq_flags = IRQF_SHARED;
3836
3837 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3838 setup_timer(&info->status_timer, status_timeout,
3839 (unsigned long)info);
3840
3841 /* Store the PCI9050 misc control register value because a flaw
3842 * in the PCI9050 prevents LCR registers from being read if
3843 * BIOS assigns an LCR base address with bit 7 set.
3844 *
3845 * Only the misc control register is accessed for which only
3846 * write access is needed, so set an initial value and change
3847 * bits to the device instance data as we write the value
3848 * to the actual misc control register.
3849 */
3850 info->misc_ctrl_value = 0x087e4546;
3851
3852 /* initial port state is unknown - if startup errors
3853 * occur, init_error will be set to indicate the
3854 * problem. Once the port is fully initialized,
3855 * this value will be set to 0 to indicate the
3856 * port is available.
3857 */
3858 info->init_error = -1;
3859 }
3860
3861 return info;
3862 }
3863
3864 static void device_init(int adapter_num, struct pci_dev *pdev)
3865 {
3866 SLMP_INFO *port_array[SCA_MAX_PORTS];
3867 int port;
3868
3869 /* allocate device instances for up to SCA_MAX_PORTS devices */
3870 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3871 port_array[port] = alloc_dev(adapter_num,port,pdev);
3872 if( port_array[port] == NULL ) {
3873 for ( --port; port >= 0; --port )
3874 kfree(port_array[port]);
3875 return;
3876 }
3877 }
3878
3879 /* give copy of port_array to all ports and add to device list */
3880 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3881 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3882 add_device( port_array[port] );
3883 spin_lock_init(&port_array[port]->lock);
3884 }
3885
3886 /* Allocate and claim adapter resources */
3887 if ( !claim_resources(port_array[0]) ) {
3888
3889 alloc_dma_bufs(port_array[0]);
3890
3891 /* copy resource information from first port to others */
3892 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3893 port_array[port]->lock = port_array[0]->lock;
3894 port_array[port]->irq_level = port_array[0]->irq_level;
3895 port_array[port]->memory_base = port_array[0]->memory_base;
3896 port_array[port]->sca_base = port_array[0]->sca_base;
3897 port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3898 port_array[port]->lcr_base = port_array[0]->lcr_base;
3899 alloc_dma_bufs(port_array[port]);
3900 }
3901
3902 if ( request_irq(port_array[0]->irq_level,
3903 synclinkmp_interrupt,
3904 port_array[0]->irq_flags,
3905 port_array[0]->device_name,
3906 port_array[0]) < 0 ) {
3907 printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3908 __FILE__,__LINE__,
3909 port_array[0]->device_name,
3910 port_array[0]->irq_level );
3911 }
3912 else {
3913 port_array[0]->irq_requested = true;
3914 adapter_test(port_array[0]);
3915 }
3916 }
3917 }
3918
3919 static const struct tty_operations ops = {
3920 .open = open,
3921 .close = close,
3922 .write = write,
3923 .put_char = put_char,
3924 .flush_chars = flush_chars,
3925 .write_room = write_room,
3926 .chars_in_buffer = chars_in_buffer,
3927 .flush_buffer = flush_buffer,
3928 .ioctl = ioctl,
3929 .throttle = throttle,
3930 .unthrottle = unthrottle,
3931 .send_xchar = send_xchar,
3932 .break_ctl = set_break,
3933 .wait_until_sent = wait_until_sent,
3934 .read_proc = read_proc,
3935 .set_termios = set_termios,
3936 .stop = tx_hold,
3937 .start = tx_release,
3938 .hangup = hangup,
3939 .tiocmget = tiocmget,
3940 .tiocmset = tiocmset,
3941 };
3942
3943 static void synclinkmp_cleanup(void)
3944 {
3945 int rc;
3946 SLMP_INFO *info;
3947 SLMP_INFO *tmp;
3948
3949 printk("Unloading %s %s\n", driver_name, driver_version);
3950
3951 if (serial_driver) {
3952 if ((rc = tty_unregister_driver(serial_driver)))
3953 printk("%s(%d) failed to unregister tty driver err=%d\n",
3954 __FILE__,__LINE__,rc);
3955 put_tty_driver(serial_driver);
3956 }
3957
3958 /* reset devices */
3959 info = synclinkmp_device_list;
3960 while(info) {
3961 reset_port(info);
3962 info = info->next_device;
3963 }
3964
3965 /* release devices */
3966 info = synclinkmp_device_list;
3967 while(info) {
3968 #if SYNCLINK_GENERIC_HDLC
3969 hdlcdev_exit(info);
3970 #endif
3971 free_dma_bufs(info);
3972 free_tmp_rx_buf(info);
3973 if ( info->port_num == 0 ) {
3974 if (info->sca_base)
3975 write_reg(info, LPR, 1); /* set low power mode */
3976 release_resources(info);
3977 }
3978 tmp = info;
3979 info = info->next_device;
3980 kfree(tmp);
3981 }
3982
3983 pci_unregister_driver(&synclinkmp_pci_driver);
3984 }
3985
3986 /* Driver initialization entry point.
3987 */
3988
3989 static int __init synclinkmp_init(void)
3990 {
3991 int rc;
3992
3993 if (break_on_load) {
3994 synclinkmp_get_text_ptr();
3995 BREAKPOINT();
3996 }
3997
3998 printk("%s %s\n", driver_name, driver_version);
3999
4000 if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
4001 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4002 return rc;
4003 }
4004
4005 serial_driver = alloc_tty_driver(128);
4006 if (!serial_driver) {
4007 rc = -ENOMEM;
4008 goto error;
4009 }
4010
4011 /* Initialize the tty_driver structure */
4012
4013 serial_driver->owner = THIS_MODULE;
4014 serial_driver->driver_name = "synclinkmp";
4015 serial_driver->name = "ttySLM";
4016 serial_driver->major = ttymajor;
4017 serial_driver->minor_start = 64;
4018 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4019 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4020 serial_driver->init_termios = tty_std_termios;
4021 serial_driver->init_termios.c_cflag =
4022 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4023 serial_driver->init_termios.c_ispeed = 9600;
4024 serial_driver->init_termios.c_ospeed = 9600;
4025 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4026 tty_set_operations(serial_driver, &ops);
4027 if ((rc = tty_register_driver(serial_driver)) < 0) {
4028 printk("%s(%d):Couldn't register serial driver\n",
4029 __FILE__,__LINE__);
4030 put_tty_driver(serial_driver);
4031 serial_driver = NULL;
4032 goto error;
4033 }
4034
4035 printk("%s %s, tty major#%d\n",
4036 driver_name, driver_version,
4037 serial_driver->major);
4038
4039 return 0;
4040
4041 error:
4042 synclinkmp_cleanup();
4043 return rc;
4044 }
4045
4046 static void __exit synclinkmp_exit(void)
4047 {
4048 synclinkmp_cleanup();
4049 }
4050
4051 module_init(synclinkmp_init);
4052 module_exit(synclinkmp_exit);
4053
4054 /* Set the port for internal loopback mode.
4055 * The TxCLK and RxCLK signals are generated from the BRG and
4056 * the TxD is looped back to the RxD internally.
4057 */
4058 static void enable_loopback(SLMP_INFO *info, int enable)
4059 {
4060 if (enable) {
4061 /* MD2 (Mode Register 2)
4062 * 01..00 CNCT<1..0> Channel Connection 11=Local Loopback
4063 */
4064 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4065
4066 /* degate external TxC clock source */
4067 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4068 write_control_reg(info);
4069
4070 /* RXS/TXS (Rx/Tx clock source)
4071 * 07 Reserved, must be 0
4072 * 06..04 Clock Source, 100=BRG
4073 * 03..00 Clock Divisor, 0000=1
4074 */
4075 write_reg(info, RXS, 0x40);
4076 write_reg(info, TXS, 0x40);
4077
4078 } else {
4079 /* MD2 (Mode Register 2)
4080 * 01..00 CNCT<1..0> Channel connection, 0=normal
4081 */
4082 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4083
4084 /* RXS/TXS (Rx/Tx clock source)
4085 * 07 Reserved, must be 0
4086 * 06..04 Clock Source, 000=RxC/TxC Pin
4087 * 03..00 Clock Divisor, 0000=1
4088 */
4089 write_reg(info, RXS, 0x00);
4090 write_reg(info, TXS, 0x00);
4091 }
4092
4093 /* set LinkSpeed if available, otherwise default to 2Mbps */
4094 if (info->params.clock_speed)
4095 set_rate(info, info->params.clock_speed);
4096 else
4097 set_rate(info, 3686400);
4098 }
4099
4100 /* Set the baud rate register to the desired speed
4101 *
4102 * data_rate data rate of clock in bits per second
4103 * A data rate of 0 disables the AUX clock.
4104 */
4105 static void set_rate( SLMP_INFO *info, u32 data_rate )
4106 {
4107 u32 TMCValue;
4108 unsigned char BRValue;
4109 u32 Divisor=0;
4110
4111 /* fBRG = fCLK/(TMC * 2^BR)
4112 */
4113 if (data_rate != 0) {
4114 Divisor = 14745600/data_rate;
4115 if (!Divisor)
4116 Divisor = 1;
4117
4118 TMCValue = Divisor;
4119
4120 BRValue = 0;
4121 if (TMCValue != 1 && TMCValue != 2) {
4122 /* BRValue of 0 provides 50/50 duty cycle *only* when
4123 * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4124 * 50/50 duty cycle.
4125 */
4126 BRValue = 1;
4127 TMCValue >>= 1;
4128 }
4129
4130 /* while TMCValue is too big for TMC register, divide
4131 * by 2 and increment BR exponent.
4132 */
4133 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4134 TMCValue >>= 1;
4135
4136 write_reg(info, TXS,
4137 (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4138 write_reg(info, RXS,
4139 (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4140 write_reg(info, TMC, (unsigned char)TMCValue);
4141 }
4142 else {
4143 write_reg(info, TXS,0);
4144 write_reg(info, RXS,0);
4145 write_reg(info, TMC, 0);
4146 }
4147 }
4148
4149 /* Disable receiver
4150 */
4151 static void rx_stop(SLMP_INFO *info)
4152 {
4153 if (debug_level >= DEBUG_LEVEL_ISR)
4154 printk("%s(%d):%s rx_stop()\n",
4155 __FILE__,__LINE__, info->device_name );
4156
4157 write_reg(info, CMD, RXRESET);
4158
4159 info->ie0_value &= ~RXRDYE;
4160 write_reg(info, IE0, info->ie0_value); /* disable Rx data interrupts */
4161
4162 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4163 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4164 write_reg(info, RXDMA + DIR, 0); /* disable Rx DMA interrupts */
4165
4166 info->rx_enabled = false;
4167 info->rx_overflow = false;
4168 }
4169
4170 /* enable the receiver
4171 */
4172 static void rx_start(SLMP_INFO *info)
4173 {
4174 int i;
4175
4176 if (debug_level >= DEBUG_LEVEL_ISR)
4177 printk("%s(%d):%s rx_start()\n",
4178 __FILE__,__LINE__, info->device_name );
4179
4180 write_reg(info, CMD, RXRESET);
4181
4182 if ( info->params.mode == MGSL_MODE_HDLC ) {
4183 /* HDLC, disabe IRQ on rxdata */
4184 info->ie0_value &= ~RXRDYE;
4185 write_reg(info, IE0, info->ie0_value);
4186
4187 /* Reset all Rx DMA buffers and program rx dma */
4188 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4189 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4190
4191 for (i = 0; i < info->rx_buf_count; i++) {
4192 info->rx_buf_list[i].status = 0xff;
4193
4194 // throttle to 4 shared memory writes at a time to prevent
4195 // hogging local bus (keep latency time for DMA requests low).
4196 if (!(i % 4))
4197 read_status_reg(info);
4198 }
4199 info->current_rx_buf = 0;
4200
4201 /* set current/1st descriptor address */
4202 write_reg16(info, RXDMA + CDA,
4203 info->rx_buf_list_ex[0].phys_entry);
4204
4205 /* set new last rx descriptor address */
4206 write_reg16(info, RXDMA + EDA,
4207 info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4208
4209 /* set buffer length (shared by all rx dma data buffers) */
4210 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4211
4212 write_reg(info, RXDMA + DIR, 0x60); /* enable Rx DMA interrupts (EOM/BOF) */
4213 write_reg(info, RXDMA + DSR, 0xf2); /* clear Rx DMA IRQs, enable Rx DMA */
4214 } else {
4215 /* async, enable IRQ on rxdata */
4216 info->ie0_value |= RXRDYE;
4217 write_reg(info, IE0, info->ie0_value);
4218 }
4219
4220 write_reg(info, CMD, RXENABLE);
4221
4222 info->rx_overflow = false;
4223 info->rx_enabled = true;
4224 }
4225
4226 /* Enable the transmitter and send a transmit frame if
4227 * one is loaded in the DMA buffers.
4228 */
4229 static void tx_start(SLMP_INFO *info)
4230 {
4231 if (debug_level >= DEBUG_LEVEL_ISR)
4232 printk("%s(%d):%s tx_start() tx_count=%d\n",
4233 __FILE__,__LINE__, info->device_name,info->tx_count );
4234
4235 if (!info->tx_enabled ) {
4236 write_reg(info, CMD, TXRESET);
4237 write_reg(info, CMD, TXENABLE);
4238 info->tx_enabled = true;
4239 }
4240
4241 if ( info->tx_count ) {
4242
4243 /* If auto RTS enabled and RTS is inactive, then assert */
4244 /* RTS and set a flag indicating that the driver should */
4245 /* negate RTS when the transmission completes. */
4246
4247 info->drop_rts_on_tx_done = false;
4248
4249 if (info->params.mode != MGSL_MODE_ASYNC) {
4250
4251 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4252 get_signals( info );
4253 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4254 info->serial_signals |= SerialSignal_RTS;
4255 set_signals( info );
4256 info->drop_rts_on_tx_done = true;
4257 }
4258 }
4259
4260 write_reg16(info, TRC0,
4261 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4262
4263 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4264 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4265
4266 /* set TX CDA (current descriptor address) */
4267 write_reg16(info, TXDMA + CDA,
4268 info->tx_buf_list_ex[0].phys_entry);
4269
4270 /* set TX EDA (last descriptor address) */
4271 write_reg16(info, TXDMA + EDA,
4272 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4273
4274 /* enable underrun IRQ */
4275 info->ie1_value &= ~IDLE;
4276 info->ie1_value |= UDRN;
4277 write_reg(info, IE1, info->ie1_value);
4278 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4279
4280 write_reg(info, TXDMA + DIR, 0x40); /* enable Tx DMA interrupts (EOM) */
4281 write_reg(info, TXDMA + DSR, 0xf2); /* clear Tx DMA IRQs, enable Tx DMA */
4282
4283 mod_timer(&info->tx_timer, jiffies +
4284 msecs_to_jiffies(5000));
4285 }
4286 else {
4287 tx_load_fifo(info);
4288 /* async, enable IRQ on txdata */
4289 info->ie0_value |= TXRDYE;
4290 write_reg(info, IE0, info->ie0_value);
4291 }
4292
4293 info->tx_active = true;
4294 }
4295 }
4296
4297 /* stop the transmitter and DMA
4298 */
4299 static void tx_stop( SLMP_INFO *info )
4300 {
4301 if (debug_level >= DEBUG_LEVEL_ISR)
4302 printk("%s(%d):%s tx_stop()\n",
4303 __FILE__,__LINE__, info->device_name );
4304
4305 del_timer(&info->tx_timer);
4306
4307 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4308 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4309
4310 write_reg(info, CMD, TXRESET);
4311
4312 info->ie1_value &= ~(UDRN + IDLE);
4313 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
4314 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
4315
4316 info->ie0_value &= ~TXRDYE;
4317 write_reg(info, IE0, info->ie0_value); /* disable tx data interrupts */
4318
4319 info->tx_enabled = false;
4320 info->tx_active = false;
4321 }
4322
4323 /* Fill the transmit FIFO until the FIFO is full or
4324 * there is no more data to load.
4325 */
4326 static void tx_load_fifo(SLMP_INFO *info)
4327 {
4328 u8 TwoBytes[2];
4329
4330 /* do nothing is now tx data available and no XON/XOFF pending */
4331
4332 if ( !info->tx_count && !info->x_char )
4333 return;
4334
4335 /* load the Transmit FIFO until FIFOs full or all data sent */
4336
4337 while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4338
4339 /* there is more space in the transmit FIFO and */
4340 /* there is more data in transmit buffer */
4341
4342 if ( (info->tx_count > 1) && !info->x_char ) {
4343 /* write 16-bits */
4344 TwoBytes[0] = info->tx_buf[info->tx_get++];
4345 if (info->tx_get >= info->max_frame_size)
4346 info->tx_get -= info->max_frame_size;
4347 TwoBytes[1] = info->tx_buf[info->tx_get++];
4348 if (info->tx_get >= info->max_frame_size)
4349 info->tx_get -= info->max_frame_size;
4350
4351 write_reg16(info, TRB, *((u16 *)TwoBytes));
4352
4353 info->tx_count -= 2;
4354 info->icount.tx += 2;
4355 } else {
4356 /* only 1 byte left to transmit or 1 FIFO slot left */
4357
4358 if (info->x_char) {
4359 /* transmit pending high priority char */
4360 write_reg(info, TRB, info->x_char);
4361 info->x_char = 0;
4362 } else {
4363 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4364 if (info->tx_get >= info->max_frame_size)
4365 info->tx_get -= info->max_frame_size;
4366 info->tx_count--;
4367 }
4368 info->icount.tx++;
4369 }
4370 }
4371 }
4372
4373 /* Reset a port to a known state
4374 */
4375 static void reset_port(SLMP_INFO *info)
4376 {
4377 if (info->sca_base) {
4378
4379 tx_stop(info);
4380 rx_stop(info);
4381
4382 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4383 set_signals(info);
4384
4385 /* disable all port interrupts */
4386 info->ie0_value = 0;
4387 info->ie1_value = 0;
4388 info->ie2_value = 0;
4389 write_reg(info, IE0, info->ie0_value);
4390 write_reg(info, IE1, info->ie1_value);
4391 write_reg(info, IE2, info->ie2_value);
4392
4393 write_reg(info, CMD, CHRESET);
4394 }
4395 }
4396
4397 /* Reset all the ports to a known state.
4398 */
4399 static void reset_adapter(SLMP_INFO *info)
4400 {
4401 int i;
4402
4403 for ( i=0; i < SCA_MAX_PORTS; ++i) {
4404 if (info->port_array[i])
4405 reset_port(info->port_array[i]);
4406 }
4407 }
4408
4409 /* Program port for asynchronous communications.
4410 */
4411 static void async_mode(SLMP_INFO *info)
4412 {
4413
4414 unsigned char RegValue;
4415
4416 tx_stop(info);
4417 rx_stop(info);
4418
4419 /* MD0, Mode Register 0
4420 *
4421 * 07..05 PRCTL<2..0>, Protocol Mode, 000=async
4422 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4423 * 03 Reserved, must be 0
4424 * 02 CRCCC, CRC Calculation, 0=disabled
4425 * 01..00 STOP<1..0> Stop bits (00=1,10=2)
4426 *
4427 * 0000 0000
4428 */
4429 RegValue = 0x00;
4430 if (info->params.stop_bits != 1)
4431 RegValue |= BIT1;
4432 write_reg(info, MD0, RegValue);
4433
4434 /* MD1, Mode Register 1
4435 *
4436 * 07..06 BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4437 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4438 * 03..02 RXCHR<1..0>, rx char size
4439 * 01..00 PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4440 *
4441 * 0100 0000
4442 */
4443 RegValue = 0x40;
4444 switch (info->params.data_bits) {
4445 case 7: RegValue |= BIT4 + BIT2; break;
4446 case 6: RegValue |= BIT5 + BIT3; break;
4447 case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4448 }
4449 if (info->params.parity != ASYNC_PARITY_NONE) {
4450 RegValue |= BIT1;
4451 if (info->params.parity == ASYNC_PARITY_ODD)
4452 RegValue |= BIT0;
4453 }
4454 write_reg(info, MD1, RegValue);
4455
4456 /* MD2, Mode Register 2
4457 *
4458 * 07..02 Reserved, must be 0
4459 * 01..00 CNCT<1..0> Channel connection, 00=normal 11=local loopback
4460 *
4461 * 0000 0000
4462 */
4463 RegValue = 0x00;
4464 if (info->params.loopback)
4465 RegValue |= (BIT1 + BIT0);
4466 write_reg(info, MD2, RegValue);
4467
4468 /* RXS, Receive clock source
4469 *
4470 * 07 Reserved, must be 0
4471 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4472 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4473 */
4474 RegValue=BIT6;
4475 write_reg(info, RXS, RegValue);
4476
4477 /* TXS, Transmit clock source
4478 *
4479 * 07 Reserved, must be 0
4480 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4481 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4482 */
4483 RegValue=BIT6;
4484 write_reg(info, TXS, RegValue);
4485
4486 /* Control Register
4487 *
4488 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4489 */
4490 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4491 write_control_reg(info);
4492
4493 tx_set_idle(info);
4494
4495 /* RRC Receive Ready Control 0
4496 *
4497 * 07..05 Reserved, must be 0
4498 * 04..00 RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4499 */
4500 write_reg(info, RRC, 0x00);
4501
4502 /* TRC0 Transmit Ready Control 0
4503 *
4504 * 07..05 Reserved, must be 0
4505 * 04..00 TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4506 */
4507 write_reg(info, TRC0, 0x10);
4508
4509 /* TRC1 Transmit Ready Control 1
4510 *
4511 * 07..05 Reserved, must be 0
4512 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4513 */
4514 write_reg(info, TRC1, 0x1e);
4515
4516 /* CTL, MSCI control register
4517 *
4518 * 07..06 Reserved, set to 0
4519 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4520 * 04 IDLC, idle control, 0=mark 1=idle register
4521 * 03 BRK, break, 0=off 1 =on (async)
4522 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4523 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4524 * 00 RTS, RTS output control, 0=active 1=inactive
4525 *
4526 * 0001 0001
4527 */
4528 RegValue = 0x10;
4529 if (!(info->serial_signals & SerialSignal_RTS))
4530 RegValue |= 0x01;
4531 write_reg(info, CTL, RegValue);
4532
4533 /* enable status interrupts */
4534 info->ie0_value |= TXINTE + RXINTE;
4535 write_reg(info, IE0, info->ie0_value);
4536
4537 /* enable break detect interrupt */
4538 info->ie1_value = BRKD;
4539 write_reg(info, IE1, info->ie1_value);
4540
4541 /* enable rx overrun interrupt */
4542 info->ie2_value = OVRN;
4543 write_reg(info, IE2, info->ie2_value);
4544
4545 set_rate( info, info->params.data_rate * 16 );
4546 }
4547
4548 /* Program the SCA for HDLC communications.
4549 */
4550 static void hdlc_mode(SLMP_INFO *info)
4551 {
4552 unsigned char RegValue;
4553 u32 DpllDivisor;
4554
4555 // Can't use DPLL because SCA outputs recovered clock on RxC when
4556 // DPLL mode selected. This causes output contention with RxC receiver.
4557 // Use of DPLL would require external hardware to disable RxC receiver
4558 // when DPLL mode selected.
4559 info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4560
4561 /* disable DMA interrupts */
4562 write_reg(info, TXDMA + DIR, 0);
4563 write_reg(info, RXDMA + DIR, 0);
4564
4565 /* MD0, Mode Register 0
4566 *
4567 * 07..05 PRCTL<2..0>, Protocol Mode, 100=HDLC
4568 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4569 * 03 Reserved, must be 0
4570 * 02 CRCCC, CRC Calculation, 1=enabled
4571 * 01 CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4572 * 00 CRC0, CRC initial value, 1 = all 1s
4573 *
4574 * 1000 0001
4575 */
4576 RegValue = 0x81;
4577 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4578 RegValue |= BIT4;
4579 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4580 RegValue |= BIT4;
4581 if (info->params.crc_type == HDLC_CRC_16_CCITT)
4582 RegValue |= BIT2 + BIT1;
4583 write_reg(info, MD0, RegValue);
4584
4585 /* MD1, Mode Register 1
4586 *
4587 * 07..06 ADDRS<1..0>, Address detect, 00=no addr check
4588 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits
4589 * 03..02 RXCHR<1..0>, rx char size, 00=8 bits
4590 * 01..00 PMPM<1..0>, Parity mode, 00=no parity
4591 *
4592 * 0000 0000
4593 */
4594 RegValue = 0x00;
4595 write_reg(info, MD1, RegValue);
4596
4597 /* MD2, Mode Register 2
4598 *
4599 * 07 NRZFM, 0=NRZ, 1=FM
4600 * 06..05 CODE<1..0> Encoding, 00=NRZ
4601 * 04..03 DRATE<1..0> DPLL Divisor, 00=8
4602 * 02 Reserved, must be 0
4603 * 01..00 CNCT<1..0> Channel connection, 0=normal
4604 *
4605 * 0000 0000
4606 */
4607 RegValue = 0x00;
4608 switch(info->params.encoding) {
4609 case HDLC_ENCODING_NRZI: RegValue |= BIT5; break;
4610 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4611 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4612 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break; /* aka Manchester */
4613 #if 0
4614 case HDLC_ENCODING_NRZB: /* not supported */
4615 case HDLC_ENCODING_NRZI_MARK: /* not supported */
4616 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: /* not supported */
4617 #endif
4618 }
4619 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4620 DpllDivisor = 16;
4621 RegValue |= BIT3;
4622 } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4623 DpllDivisor = 8;
4624 } else {
4625 DpllDivisor = 32;
4626 RegValue |= BIT4;
4627 }
4628 write_reg(info, MD2, RegValue);
4629
4630
4631 /* RXS, Receive clock source
4632 *
4633 * 07 Reserved, must be 0
4634 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4635 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4636 */
4637 RegValue=0;
4638 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4639 RegValue |= BIT6;
4640 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4641 RegValue |= BIT6 + BIT5;
4642 write_reg(info, RXS, RegValue);
4643
4644 /* TXS, Transmit clock source
4645 *
4646 * 07 Reserved, must be 0
4647 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4648 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4649 */
4650 RegValue=0;
4651 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4652 RegValue |= BIT6;
4653 if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4654 RegValue |= BIT6 + BIT5;
4655 write_reg(info, TXS, RegValue);
4656
4657 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4658 set_rate(info, info->params.clock_speed * DpllDivisor);
4659 else
4660 set_rate(info, info->params.clock_speed);
4661
4662 /* GPDATA (General Purpose I/O Data Register)
4663 *
4664 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4665 */
4666 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4667 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4668 else
4669 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4670 write_control_reg(info);
4671
4672 /* RRC Receive Ready Control 0
4673 *
4674 * 07..05 Reserved, must be 0
4675 * 04..00 RRC<4..0> Rx FIFO trigger active
4676 */
4677 write_reg(info, RRC, rx_active_fifo_level);
4678
4679 /* TRC0 Transmit Ready Control 0
4680 *
4681 * 07..05 Reserved, must be 0
4682 * 04..00 TRC<4..0> Tx FIFO trigger active
4683 */
4684 write_reg(info, TRC0, tx_active_fifo_level);
4685
4686 /* TRC1 Transmit Ready Control 1
4687 *
4688 * 07..05 Reserved, must be 0
4689 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4690 */
4691 write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4692
4693 /* DMR, DMA Mode Register
4694 *
4695 * 07..05 Reserved, must be 0
4696 * 04 TMOD, Transfer Mode: 1=chained-block
4697 * 03 Reserved, must be 0
4698 * 02 NF, Number of Frames: 1=multi-frame
4699 * 01 CNTE, Frame End IRQ Counter enable: 0=disabled
4700 * 00 Reserved, must be 0
4701 *
4702 * 0001 0100
4703 */
4704 write_reg(info, TXDMA + DMR, 0x14);
4705 write_reg(info, RXDMA + DMR, 0x14);
4706
4707 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4708 write_reg(info, RXDMA + CPB,
4709 (unsigned char)(info->buffer_list_phys >> 16));
4710
4711 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4712 write_reg(info, TXDMA + CPB,
4713 (unsigned char)(info->buffer_list_phys >> 16));
4714
4715 /* enable status interrupts. other code enables/disables
4716 * the individual sources for these two interrupt classes.
4717 */
4718 info->ie0_value |= TXINTE + RXINTE;
4719 write_reg(info, IE0, info->ie0_value);
4720
4721 /* CTL, MSCI control register
4722 *
4723 * 07..06 Reserved, set to 0
4724 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4725 * 04 IDLC, idle control, 0=mark 1=idle register
4726 * 03 BRK, break, 0=off 1 =on (async)
4727 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4728 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4729 * 00 RTS, RTS output control, 0=active 1=inactive
4730 *
4731 * 0001 0001
4732 */
4733 RegValue = 0x10;
4734 if (!(info->serial_signals & SerialSignal_RTS))
4735 RegValue |= 0x01;
4736 write_reg(info, CTL, RegValue);
4737
4738 /* preamble not supported ! */
4739
4740 tx_set_idle(info);
4741 tx_stop(info);
4742 rx_stop(info);
4743
4744 set_rate(info, info->params.clock_speed);
4745
4746 if (info->params.loopback)
4747 enable_loopback(info,1);
4748 }
4749
4750 /* Set the transmit HDLC idle mode
4751 */
4752 static void tx_set_idle(SLMP_INFO *info)
4753 {
4754 unsigned char RegValue = 0xff;
4755
4756 /* Map API idle mode to SCA register bits */
4757 switch(info->idle_mode) {
4758 case HDLC_TXIDLE_FLAGS: RegValue = 0x7e; break;
4759 case HDLC_TXIDLE_ALT_ZEROS_ONES: RegValue = 0xaa; break;
4760 case HDLC_TXIDLE_ZEROS: RegValue = 0x00; break;
4761 case HDLC_TXIDLE_ONES: RegValue = 0xff; break;
4762 case HDLC_TXIDLE_ALT_MARK_SPACE: RegValue = 0xaa; break;
4763 case HDLC_TXIDLE_SPACE: RegValue = 0x00; break;
4764 case HDLC_TXIDLE_MARK: RegValue = 0xff; break;
4765 }
4766
4767 write_reg(info, IDL, RegValue);
4768 }
4769
4770 /* Query the adapter for the state of the V24 status (input) signals.
4771 */
4772 static void get_signals(SLMP_INFO *info)
4773 {
4774 u16 status = read_reg(info, SR3);
4775 u16 gpstatus = read_status_reg(info);
4776 u16 testbit;
4777
4778 /* clear all serial signals except DTR and RTS */
4779 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4780
4781 /* set serial signal bits to reflect MISR */
4782
4783 if (!(status & BIT3))
4784 info->serial_signals |= SerialSignal_CTS;
4785
4786 if ( !(status & BIT2))
4787 info->serial_signals |= SerialSignal_DCD;
4788
4789 testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4790 if (!(gpstatus & testbit))
4791 info->serial_signals |= SerialSignal_RI;
4792
4793 testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4794 if (!(gpstatus & testbit))
4795 info->serial_signals |= SerialSignal_DSR;
4796 }
4797
4798 /* Set the state of DTR and RTS based on contents of
4799 * serial_signals member of device context.
4800 */
4801 static void set_signals(SLMP_INFO *info)
4802 {
4803 unsigned char RegValue;
4804 u16 EnableBit;
4805
4806 RegValue = read_reg(info, CTL);
4807 if (info->serial_signals & SerialSignal_RTS)
4808 RegValue &= ~BIT0;
4809 else
4810 RegValue |= BIT0;
4811 write_reg(info, CTL, RegValue);
4812
4813 // Port 0..3 DTR is ctrl reg <1,3,5,7>
4814 EnableBit = BIT1 << (info->port_num*2);
4815 if (info->serial_signals & SerialSignal_DTR)
4816 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4817 else
4818 info->port_array[0]->ctrlreg_value |= EnableBit;
4819 write_control_reg(info);
4820 }
4821
4822 /*******************/
4823 /* DMA Buffer Code */
4824 /*******************/
4825
4826 /* Set the count for all receive buffers to SCABUFSIZE
4827 * and set the current buffer to the first buffer. This effectively
4828 * makes all buffers free and discards any data in buffers.
4829 */
4830 static void rx_reset_buffers(SLMP_INFO *info)
4831 {
4832 rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4833 }
4834
4835 /* Free the buffers used by a received frame
4836 *
4837 * info pointer to device instance data
4838 * first index of 1st receive buffer of frame
4839 * last index of last receive buffer of frame
4840 */
4841 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4842 {
4843 bool done = false;
4844
4845 while(!done) {
4846 /* reset current buffer for reuse */
4847 info->rx_buf_list[first].status = 0xff;
4848
4849 if (first == last) {
4850 done = true;
4851 /* set new last rx descriptor address */
4852 write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4853 }
4854
4855 first++;
4856 if (first == info->rx_buf_count)
4857 first = 0;
4858 }
4859
4860 /* set current buffer to next buffer after last buffer of frame */
4861 info->current_rx_buf = first;
4862 }
4863
4864 /* Return a received frame from the receive DMA buffers.
4865 * Only frames received without errors are returned.
4866 *
4867 * Return Value: true if frame returned, otherwise false
4868 */
4869 static bool rx_get_frame(SLMP_INFO *info)
4870 {
4871 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
4872 unsigned short status;
4873 unsigned int framesize = 0;
4874 bool ReturnCode = false;
4875 unsigned long flags;
4876 struct tty_struct *tty = info->port.tty;
4877 unsigned char addr_field = 0xff;
4878 SCADESC *desc;
4879 SCADESC_EX *desc_ex;
4880
4881 CheckAgain:
4882 /* assume no frame returned, set zero length */
4883 framesize = 0;
4884 addr_field = 0xff;
4885
4886 /*
4887 * current_rx_buf points to the 1st buffer of the next available
4888 * receive frame. To find the last buffer of the frame look for
4889 * a non-zero status field in the buffer entries. (The status
4890 * field is set by the 16C32 after completing a receive frame.
4891 */
4892 StartIndex = EndIndex = info->current_rx_buf;
4893
4894 for ( ;; ) {
4895 desc = &info->rx_buf_list[EndIndex];
4896 desc_ex = &info->rx_buf_list_ex[EndIndex];
4897
4898 if (desc->status == 0xff)
4899 goto Cleanup; /* current desc still in use, no frames available */
4900
4901 if (framesize == 0 && info->params.addr_filter != 0xff)
4902 addr_field = desc_ex->virt_addr[0];
4903
4904 framesize += desc->length;
4905
4906 /* Status != 0 means last buffer of frame */
4907 if (desc->status)
4908 break;
4909
4910 EndIndex++;
4911 if (EndIndex == info->rx_buf_count)
4912 EndIndex = 0;
4913
4914 if (EndIndex == info->current_rx_buf) {
4915 /* all buffers have been 'used' but none mark */
4916 /* the end of a frame. Reset buffers and receiver. */
4917 if ( info->rx_enabled ){
4918 spin_lock_irqsave(&info->lock,flags);
4919 rx_start(info);
4920 spin_unlock_irqrestore(&info->lock,flags);
4921 }
4922 goto Cleanup;
4923 }
4924
4925 }
4926
4927 /* check status of receive frame */
4928
4929 /* frame status is byte stored after frame data
4930 *
4931 * 7 EOM (end of msg), 1 = last buffer of frame
4932 * 6 Short Frame, 1 = short frame
4933 * 5 Abort, 1 = frame aborted
4934 * 4 Residue, 1 = last byte is partial
4935 * 3 Overrun, 1 = overrun occurred during frame reception
4936 * 2 CRC, 1 = CRC error detected
4937 *
4938 */
4939 status = desc->status;
4940
4941 /* ignore CRC bit if not using CRC (bit is undefined) */
4942 /* Note:CRC is not save to data buffer */
4943 if (info->params.crc_type == HDLC_CRC_NONE)
4944 status &= ~BIT2;
4945
4946 if (framesize == 0 ||
4947 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4948 /* discard 0 byte frames, this seems to occur sometime
4949 * when remote is idling flags.
4950 */
4951 rx_free_frame_buffers(info, StartIndex, EndIndex);
4952 goto CheckAgain;
4953 }
4954
4955 if (framesize < 2)
4956 status |= BIT6;
4957
4958 if (status & (BIT6+BIT5+BIT3+BIT2)) {
4959 /* received frame has errors,
4960 * update counts and mark frame size as 0
4961 */
4962 if (status & BIT6)
4963 info->icount.rxshort++;
4964 else if (status & BIT5)
4965 info->icount.rxabort++;
4966 else if (status & BIT3)
4967 info->icount.rxover++;
4968 else
4969 info->icount.rxcrc++;
4970
4971 framesize = 0;
4972 #if SYNCLINK_GENERIC_HDLC
4973 {
4974 info->netdev->stats.rx_errors++;
4975 info->netdev->stats.rx_frame_errors++;
4976 }
4977 #endif
4978 }
4979
4980 if ( debug_level >= DEBUG_LEVEL_BH )
4981 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4982 __FILE__,__LINE__,info->device_name,status,framesize);
4983
4984 if ( debug_level >= DEBUG_LEVEL_DATA )
4985 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4986 min_t(int, framesize,SCABUFSIZE),0);
4987
4988 if (framesize) {
4989 if (framesize > info->max_frame_size)
4990 info->icount.rxlong++;
4991 else {
4992 /* copy dma buffer(s) to contiguous intermediate buffer */
4993 int copy_count = framesize;
4994 int index = StartIndex;
4995 unsigned char *ptmp = info->tmp_rx_buf;
4996 info->tmp_rx_buf_count = framesize;
4997
4998 info->icount.rxok++;
4999
5000 while(copy_count) {
5001 int partial_count = min(copy_count,SCABUFSIZE);
5002 memcpy( ptmp,
5003 info->rx_buf_list_ex[index].virt_addr,
5004 partial_count );
5005 ptmp += partial_count;
5006 copy_count -= partial_count;
5007
5008 if ( ++index == info->rx_buf_count )
5009 index = 0;
5010 }
5011
5012 #if SYNCLINK_GENERIC_HDLC
5013 if (info->netcount)
5014 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5015 else
5016 #endif
5017 ldisc_receive_buf(tty,info->tmp_rx_buf,
5018 info->flag_buf, framesize);
5019 }
5020 }
5021 /* Free the buffers used by this frame. */
5022 rx_free_frame_buffers( info, StartIndex, EndIndex );
5023
5024 ReturnCode = true;
5025
5026 Cleanup:
5027 if ( info->rx_enabled && info->rx_overflow ) {
5028 /* Receiver is enabled, but needs to restarted due to
5029 * rx buffer overflow. If buffers are empty, restart receiver.
5030 */
5031 if (info->rx_buf_list[EndIndex].status == 0xff) {
5032 spin_lock_irqsave(&info->lock,flags);
5033 rx_start(info);
5034 spin_unlock_irqrestore(&info->lock,flags);
5035 }
5036 }
5037
5038 return ReturnCode;
5039 }
5040
5041 /* load the transmit DMA buffer with data
5042 */
5043 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5044 {
5045 unsigned short copy_count;
5046 unsigned int i = 0;
5047 SCADESC *desc;
5048 SCADESC_EX *desc_ex;
5049
5050 if ( debug_level >= DEBUG_LEVEL_DATA )
5051 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5052
5053 /* Copy source buffer to one or more DMA buffers, starting with
5054 * the first transmit dma buffer.
5055 */
5056 for(i=0;;)
5057 {
5058 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5059
5060 desc = &info->tx_buf_list[i];
5061 desc_ex = &info->tx_buf_list_ex[i];
5062
5063 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5064
5065 desc->length = copy_count;
5066 desc->status = 0;
5067
5068 buf += copy_count;
5069 count -= copy_count;
5070
5071 if (!count)
5072 break;
5073
5074 i++;
5075 if (i >= info->tx_buf_count)
5076 i = 0;
5077 }
5078
5079 info->tx_buf_list[i].status = 0x81; /* set EOM and EOT status */
5080 info->last_tx_buf = ++i;
5081 }
5082
5083 static bool register_test(SLMP_INFO *info)
5084 {
5085 static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5086 static unsigned int count = ARRAY_SIZE(testval);
5087 unsigned int i;
5088 bool rc = true;
5089 unsigned long flags;
5090
5091 spin_lock_irqsave(&info->lock,flags);
5092 reset_port(info);
5093
5094 /* assume failure */
5095 info->init_error = DiagStatus_AddressFailure;
5096
5097 /* Write bit patterns to various registers but do it out of */
5098 /* sync, then read back and verify values. */
5099
5100 for (i = 0 ; i < count ; i++) {
5101 write_reg(info, TMC, testval[i]);
5102 write_reg(info, IDL, testval[(i+1)%count]);
5103 write_reg(info, SA0, testval[(i+2)%count]);
5104 write_reg(info, SA1, testval[(i+3)%count]);
5105
5106 if ( (read_reg(info, TMC) != testval[i]) ||
5107 (read_reg(info, IDL) != testval[(i+1)%count]) ||
5108 (read_reg(info, SA0) != testval[(i+2)%count]) ||
5109 (read_reg(info, SA1) != testval[(i+3)%count]) )
5110 {
5111 rc = false;
5112 break;
5113 }
5114 }
5115
5116 reset_port(info);
5117 spin_unlock_irqrestore(&info->lock,flags);
5118
5119 return rc;
5120 }
5121
5122 static bool irq_test(SLMP_INFO *info)
5123 {
5124 unsigned long timeout;
5125 unsigned long flags;
5126
5127 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5128
5129 spin_lock_irqsave(&info->lock,flags);
5130 reset_port(info);
5131
5132 /* assume failure */
5133 info->init_error = DiagStatus_IrqFailure;
5134 info->irq_occurred = false;
5135
5136 /* setup timer0 on SCA0 to interrupt */
5137
5138 /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5139 write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5140
5141 write_reg(info, (unsigned char)(timer + TEPR), 0); /* timer expand prescale */
5142 write_reg16(info, (unsigned char)(timer + TCONR), 1); /* timer constant */
5143
5144
5145 /* TMCS, Timer Control/Status Register
5146 *
5147 * 07 CMF, Compare match flag (read only) 1=match
5148 * 06 ECMI, CMF Interrupt Enable: 1=enabled
5149 * 05 Reserved, must be 0
5150 * 04 TME, Timer Enable
5151 * 03..00 Reserved, must be 0
5152 *
5153 * 0101 0000
5154 */
5155 write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5156
5157 spin_unlock_irqrestore(&info->lock,flags);
5158
5159 timeout=100;
5160 while( timeout-- && !info->irq_occurred ) {
5161 msleep_interruptible(10);
5162 }
5163
5164 spin_lock_irqsave(&info->lock,flags);
5165 reset_port(info);
5166 spin_unlock_irqrestore(&info->lock,flags);
5167
5168 return info->irq_occurred;
5169 }
5170
5171 /* initialize individual SCA device (2 ports)
5172 */
5173 static bool sca_init(SLMP_INFO *info)
5174 {
5175 /* set wait controller to single mem partition (low), no wait states */
5176 write_reg(info, PABR0, 0); /* wait controller addr boundary 0 */
5177 write_reg(info, PABR1, 0); /* wait controller addr boundary 1 */
5178 write_reg(info, WCRL, 0); /* wait controller low range */
5179 write_reg(info, WCRM, 0); /* wait controller mid range */
5180 write_reg(info, WCRH, 0); /* wait controller high range */
5181
5182 /* DPCR, DMA Priority Control
5183 *
5184 * 07..05 Not used, must be 0
5185 * 04 BRC, bus release condition: 0=all transfers complete
5186 * 03 CCC, channel change condition: 0=every cycle
5187 * 02..00 PR<2..0>, priority 100=round robin
5188 *
5189 * 00000100 = 0x04
5190 */
5191 write_reg(info, DPCR, dma_priority);
5192
5193 /* DMA Master Enable, BIT7: 1=enable all channels */
5194 write_reg(info, DMER, 0x80);
5195
5196 /* enable all interrupt classes */
5197 write_reg(info, IER0, 0xff); /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5198 write_reg(info, IER1, 0xff); /* DMIB,DMIA (channels 0-3) */
5199 write_reg(info, IER2, 0xf0); /* TIRQ (timers 0-3) */
5200
5201 /* ITCR, interrupt control register
5202 * 07 IPC, interrupt priority, 0=MSCI->DMA
5203 * 06..05 IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5204 * 04 VOS, Vector Output, 0=unmodified vector
5205 * 03..00 Reserved, must be 0
5206 */
5207 write_reg(info, ITCR, 0);
5208
5209 return true;
5210 }
5211
5212 /* initialize adapter hardware
5213 */
5214 static bool init_adapter(SLMP_INFO *info)
5215 {
5216 int i;
5217
5218 /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5219 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5220 u32 readval;
5221
5222 info->misc_ctrl_value |= BIT30;
5223 *MiscCtrl = info->misc_ctrl_value;
5224
5225 /*
5226 * Force at least 170ns delay before clearing
5227 * reset bit. Each read from LCR takes at least
5228 * 30ns so 10 times for 300ns to be safe.
5229 */
5230 for(i=0;i<10;i++)
5231 readval = *MiscCtrl;
5232
5233 info->misc_ctrl_value &= ~BIT30;
5234 *MiscCtrl = info->misc_ctrl_value;
5235
5236 /* init control reg (all DTRs off, all clksel=input) */
5237 info->ctrlreg_value = 0xaa;
5238 write_control_reg(info);
5239
5240 {
5241 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5242 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5243
5244 switch(read_ahead_count)
5245 {
5246 case 16:
5247 lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5248 break;
5249 case 8:
5250 lcr1_brdr_value |= BIT5 + BIT4;
5251 break;
5252 case 4:
5253 lcr1_brdr_value |= BIT5 + BIT3;
5254 break;
5255 case 0:
5256 lcr1_brdr_value |= BIT5;
5257 break;
5258 }
5259
5260 *LCR1BRDR = lcr1_brdr_value;
5261 *MiscCtrl = misc_ctrl_value;
5262 }
5263
5264 sca_init(info->port_array[0]);
5265 sca_init(info->port_array[2]);
5266
5267 return true;
5268 }
5269
5270 /* Loopback an HDLC frame to test the hardware
5271 * interrupt and DMA functions.
5272 */
5273 static bool loopback_test(SLMP_INFO *info)
5274 {
5275 #define TESTFRAMESIZE 20
5276
5277 unsigned long timeout;
5278 u16 count = TESTFRAMESIZE;
5279 unsigned char buf[TESTFRAMESIZE];
5280 bool rc = false;
5281 unsigned long flags;
5282
5283 struct tty_struct *oldtty = info->port.tty;
5284 u32 speed = info->params.clock_speed;
5285
5286 info->params.clock_speed = 3686400;
5287 info->port.tty = NULL;
5288
5289 /* assume failure */
5290 info->init_error = DiagStatus_DmaFailure;
5291
5292 /* build and send transmit frame */
5293 for (count = 0; count < TESTFRAMESIZE;++count)
5294 buf[count] = (unsigned char)count;
5295
5296 memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5297
5298 /* program hardware for HDLC and enabled receiver */
5299 spin_lock_irqsave(&info->lock,flags);
5300 hdlc_mode(info);
5301 enable_loopback(info,1);
5302 rx_start(info);
5303 info->tx_count = count;
5304 tx_load_dma_buffer(info,buf,count);
5305 tx_start(info);
5306 spin_unlock_irqrestore(&info->lock,flags);
5307
5308 /* wait for receive complete */
5309 /* Set a timeout for waiting for interrupt. */
5310 for ( timeout = 100; timeout; --timeout ) {
5311 msleep_interruptible(10);
5312
5313 if (rx_get_frame(info)) {
5314 rc = true;
5315 break;
5316 }
5317 }
5318
5319 /* verify received frame length and contents */
5320 if (rc &&
5321 ( info->tmp_rx_buf_count != count ||
5322 memcmp(buf, info->tmp_rx_buf,count))) {
5323 rc = false;
5324 }
5325
5326 spin_lock_irqsave(&info->lock,flags);
5327 reset_adapter(info);
5328 spin_unlock_irqrestore(&info->lock,flags);
5329
5330 info->params.clock_speed = speed;
5331 info->port.tty = oldtty;
5332
5333 return rc;
5334 }
5335
5336 /* Perform diagnostics on hardware
5337 */
5338 static int adapter_test( SLMP_INFO *info )
5339 {
5340 unsigned long flags;
5341 if ( debug_level >= DEBUG_LEVEL_INFO )
5342 printk( "%s(%d):Testing device %s\n",
5343 __FILE__,__LINE__,info->device_name );
5344
5345 spin_lock_irqsave(&info->lock,flags);
5346 init_adapter(info);
5347 spin_unlock_irqrestore(&info->lock,flags);
5348
5349 info->port_array[0]->port_count = 0;
5350
5351 if ( register_test(info->port_array[0]) &&
5352 register_test(info->port_array[1])) {
5353
5354 info->port_array[0]->port_count = 2;
5355
5356 if ( register_test(info->port_array[2]) &&
5357 register_test(info->port_array[3]) )
5358 info->port_array[0]->port_count += 2;
5359 }
5360 else {
5361 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5362 __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5363 return -ENODEV;
5364 }
5365
5366 if ( !irq_test(info->port_array[0]) ||
5367 !irq_test(info->port_array[1]) ||
5368 (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5369 (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5370 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5371 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5372 return -ENODEV;
5373 }
5374
5375 if (!loopback_test(info->port_array[0]) ||
5376 !loopback_test(info->port_array[1]) ||
5377 (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5378 (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5379 printk( "%s(%d):DMA test failure for device %s\n",
5380 __FILE__,__LINE__,info->device_name);
5381 return -ENODEV;
5382 }
5383
5384 if ( debug_level >= DEBUG_LEVEL_INFO )
5385 printk( "%s(%d):device %s passed diagnostics\n",
5386 __FILE__,__LINE__,info->device_name );
5387
5388 info->port_array[0]->init_error = 0;
5389 info->port_array[1]->init_error = 0;
5390 if ( info->port_count > 2 ) {
5391 info->port_array[2]->init_error = 0;
5392 info->port_array[3]->init_error = 0;
5393 }
5394
5395 return 0;
5396 }
5397
5398 /* Test the shared memory on a PCI adapter.
5399 */
5400 static bool memory_test(SLMP_INFO *info)
5401 {
5402 static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5403 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5404 unsigned long count = ARRAY_SIZE(testval);
5405 unsigned long i;
5406 unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5407 unsigned long * addr = (unsigned long *)info->memory_base;
5408
5409 /* Test data lines with test pattern at one location. */
5410
5411 for ( i = 0 ; i < count ; i++ ) {
5412 *addr = testval[i];
5413 if ( *addr != testval[i] )
5414 return false;
5415 }
5416
5417 /* Test address lines with incrementing pattern over */
5418 /* entire address range. */
5419
5420 for ( i = 0 ; i < limit ; i++ ) {
5421 *addr = i * 4;
5422 addr++;
5423 }
5424
5425 addr = (unsigned long *)info->memory_base;
5426
5427 for ( i = 0 ; i < limit ; i++ ) {
5428 if ( *addr != i * 4 )
5429 return false;
5430 addr++;
5431 }
5432
5433 memset( info->memory_base, 0, SCA_MEM_SIZE );
5434 return true;
5435 }
5436
5437 /* Load data into PCI adapter shared memory.
5438 *
5439 * The PCI9050 releases control of the local bus
5440 * after completing the current read or write operation.
5441 *
5442 * While the PCI9050 write FIFO not empty, the
5443 * PCI9050 treats all of the writes as a single transaction
5444 * and does not release the bus. This causes DMA latency problems
5445 * at high speeds when copying large data blocks to the shared memory.
5446 *
5447 * This function breaks a write into multiple transations by
5448 * interleaving a read which flushes the write FIFO and 'completes'
5449 * the write transation. This allows any pending DMA request to gain control
5450 * of the local bus in a timely fasion.
5451 */
5452 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5453 {
5454 /* A load interval of 16 allows for 4 32-bit writes at */
5455 /* 136ns each for a maximum latency of 542ns on the local bus.*/
5456
5457 unsigned short interval = count / sca_pci_load_interval;
5458 unsigned short i;
5459
5460 for ( i = 0 ; i < interval ; i++ )
5461 {
5462 memcpy(dest, src, sca_pci_load_interval);
5463 read_status_reg(info);
5464 dest += sca_pci_load_interval;
5465 src += sca_pci_load_interval;
5466 }
5467
5468 memcpy(dest, src, count % sca_pci_load_interval);
5469 }
5470
5471 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5472 {
5473 int i;
5474 int linecount;
5475 if (xmit)
5476 printk("%s tx data:\n",info->device_name);
5477 else
5478 printk("%s rx data:\n",info->device_name);
5479
5480 while(count) {
5481 if (count > 16)
5482 linecount = 16;
5483 else
5484 linecount = count;
5485
5486 for(i=0;i<linecount;i++)
5487 printk("%02X ",(unsigned char)data[i]);
5488 for(;i<17;i++)
5489 printk(" ");
5490 for(i=0;i<linecount;i++) {
5491 if (data[i]>=040 && data[i]<=0176)
5492 printk("%c",data[i]);
5493 else
5494 printk(".");
5495 }
5496 printk("\n");
5497
5498 data += linecount;
5499 count -= linecount;
5500 }
5501 } /* end of trace_block() */
5502
5503 /* called when HDLC frame times out
5504 * update stats and do tx completion processing
5505 */
5506 static void tx_timeout(unsigned long context)
5507 {
5508 SLMP_INFO *info = (SLMP_INFO*)context;
5509 unsigned long flags;
5510
5511 if ( debug_level >= DEBUG_LEVEL_INFO )
5512 printk( "%s(%d):%s tx_timeout()\n",
5513 __FILE__,__LINE__,info->device_name);
5514 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5515 info->icount.txtimeout++;
5516 }
5517 spin_lock_irqsave(&info->lock,flags);
5518 info->tx_active = false;
5519 info->tx_count = info->tx_put = info->tx_get = 0;
5520
5521 spin_unlock_irqrestore(&info->lock,flags);
5522
5523 #if SYNCLINK_GENERIC_HDLC
5524 if (info->netcount)
5525 hdlcdev_tx_done(info);
5526 else
5527 #endif
5528 bh_transmit(info);
5529 }
5530
5531 /* called to periodically check the DSR/RI modem signal input status
5532 */
5533 static void status_timeout(unsigned long context)
5534 {
5535 u16 status = 0;
5536 SLMP_INFO *info = (SLMP_INFO*)context;
5537 unsigned long flags;
5538 unsigned char delta;
5539
5540
5541 spin_lock_irqsave(&info->lock,flags);
5542 get_signals(info);
5543 spin_unlock_irqrestore(&info->lock,flags);
5544
5545 /* check for DSR/RI state change */
5546
5547 delta = info->old_signals ^ info->serial_signals;
5548 info->old_signals = info->serial_signals;
5549
5550 if (delta & SerialSignal_DSR)
5551 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5552
5553 if (delta & SerialSignal_RI)
5554 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5555
5556 if (delta & SerialSignal_DCD)
5557 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5558
5559 if (delta & SerialSignal_CTS)
5560 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5561
5562 if (status)
5563 isr_io_pin(info,status);
5564
5565 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5566 }
5567
5568
5569 /* Register Access Routines -
5570 * All registers are memory mapped
5571 */
5572 #define CALC_REGADDR() \
5573 unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5574 if (info->port_num > 1) \
5575 RegAddr += 256; /* port 0-1 SCA0, 2-3 SCA1 */ \
5576 if ( info->port_num & 1) { \
5577 if (Addr > 0x7f) \
5578 RegAddr += 0x40; /* DMA access */ \
5579 else if (Addr > 0x1f && Addr < 0x60) \
5580 RegAddr += 0x20; /* MSCI access */ \
5581 }
5582
5583
5584 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5585 {
5586 CALC_REGADDR();
5587 return *RegAddr;
5588 }
5589 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5590 {
5591 CALC_REGADDR();
5592 *RegAddr = Value;
5593 }
5594
5595 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5596 {
5597 CALC_REGADDR();
5598 return *((u16 *)RegAddr);
5599 }
5600
5601 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5602 {
5603 CALC_REGADDR();
5604 *((u16 *)RegAddr) = Value;
5605 }
5606
5607 static unsigned char read_status_reg(SLMP_INFO * info)
5608 {
5609 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5610 return *RegAddr;
5611 }
5612
5613 static void write_control_reg(SLMP_INFO * info)
5614 {
5615 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5616 *RegAddr = info->port_array[0]->ctrlreg_value;
5617 }
5618
5619
5620 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5621 const struct pci_device_id *ent)
5622 {
5623 if (pci_enable_device(dev)) {
5624 printk("error enabling pci device %p\n", dev);
5625 return -EIO;
5626 }
5627 device_init( ++synclinkmp_adapter_count, dev );
5628 return 0;
5629 }
5630
5631 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5632 {
5633 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree