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OMAPFB: Fix possible null pointer dereferencing
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / tty / synclinkmp.c
blobf17d9f3d84a2e80c512fbfac0e8cd634485b5fa4
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/seq_file.h>
54 #include <linux/slab.h>
55 #include <linux/netdevice.h>
56 #include <linux/vmalloc.h>
57 #include <linux/init.h>
58 #include <linux/delay.h>
59 #include <linux/ioctl.h>
60
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 bool 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, unsigned int cmd, unsigned long arg);
523 static int chars_in_buffer(struct tty_struct *tty);
524 static void throttle(struct tty_struct * tty);
525 static void unthrottle(struct tty_struct * tty);
526 static int set_break(struct tty_struct *tty, int break_state);
527
528 #if SYNCLINK_GENERIC_HDLC
529 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
530 static void hdlcdev_tx_done(SLMP_INFO *info);
531 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
532 static int hdlcdev_init(SLMP_INFO *info);
533 static void hdlcdev_exit(SLMP_INFO *info);
534 #endif
535
536 /* ioctl handlers */
537
538 static int get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
539 static int get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
540 static int set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
541 static int get_txidle(SLMP_INFO *info, int __user *idle_mode);
542 static int set_txidle(SLMP_INFO *info, int idle_mode);
543 static int tx_enable(SLMP_INFO *info, int enable);
544 static int tx_abort(SLMP_INFO *info);
545 static int rx_enable(SLMP_INFO *info, int enable);
546 static int modem_input_wait(SLMP_INFO *info,int arg);
547 static int wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
548 static int tiocmget(struct tty_struct *tty);
549 static int tiocmset(struct tty_struct *tty,
550 unsigned int set, unsigned int clear);
551 static int set_break(struct tty_struct *tty, int break_state);
552
553 static void add_device(SLMP_INFO *info);
554 static void device_init(int adapter_num, struct pci_dev *pdev);
555 static int claim_resources(SLMP_INFO *info);
556 static void release_resources(SLMP_INFO *info);
557
558 static int startup(SLMP_INFO *info);
559 static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
560 static int carrier_raised(struct tty_port *port);
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 static int install(struct tty_driver *driver, struct tty_struct *tty)
715 {
716 SLMP_INFO *info;
717 int line = tty->index;
718
719 if (line >= synclinkmp_device_count) {
720 printk("%s(%d): open with invalid line #%d.\n",
721 __FILE__,__LINE__,line);
722 return -ENODEV;
723 }
724
725 info = synclinkmp_device_list;
726 while (info && info->line != line)
727 info = info->next_device;
728 if (sanity_check(info, tty->name, "open"))
729 return -ENODEV;
730 if (info->init_error) {
731 printk("%s(%d):%s device is not allocated, init error=%d\n",
732 __FILE__, __LINE__, info->device_name,
733 info->init_error);
734 return -ENODEV;
735 }
736
737 tty->driver_data = info;
738
739 return tty_port_install(&info->port, driver, tty);
740 }
741
742 /* Called when a port is opened. Init and enable port.
743 */
744 static int open(struct tty_struct *tty, struct file *filp)
745 {
746 SLMP_INFO *info = tty->driver_data;
747 unsigned long flags;
748 int retval;
749
750 info->port.tty = tty;
751
752 if (debug_level >= DEBUG_LEVEL_INFO)
753 printk("%s(%d):%s open(), old ref count = %d\n",
754 __FILE__,__LINE__,tty->driver->name, info->port.count);
755
756 /* If port is closing, signal caller to try again */
757 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
758 if (info->port.flags & ASYNC_CLOSING)
759 interruptible_sleep_on(&info->port.close_wait);
760 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
761 -EAGAIN : -ERESTARTSYS);
762 goto cleanup;
763 }
764
765 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
766
767 spin_lock_irqsave(&info->netlock, flags);
768 if (info->netcount) {
769 retval = -EBUSY;
770 spin_unlock_irqrestore(&info->netlock, flags);
771 goto cleanup;
772 }
773 info->port.count++;
774 spin_unlock_irqrestore(&info->netlock, flags);
775
776 if (info->port.count == 1) {
777 /* 1st open on this device, init hardware */
778 retval = startup(info);
779 if (retval < 0)
780 goto cleanup;
781 }
782
783 retval = block_til_ready(tty, filp, info);
784 if (retval) {
785 if (debug_level >= DEBUG_LEVEL_INFO)
786 printk("%s(%d):%s block_til_ready() returned %d\n",
787 __FILE__,__LINE__, info->device_name, retval);
788 goto cleanup;
789 }
790
791 if (debug_level >= DEBUG_LEVEL_INFO)
792 printk("%s(%d):%s open() success\n",
793 __FILE__,__LINE__, info->device_name);
794 retval = 0;
795
796 cleanup:
797 if (retval) {
798 if (tty->count == 1)
799 info->port.tty = NULL; /* tty layer will release tty struct */
800 if(info->port.count)
801 info->port.count--;
802 }
803
804 return retval;
805 }
806
807 /* Called when port is closed. Wait for remaining data to be
808 * sent. Disable port and free resources.
809 */
810 static void close(struct tty_struct *tty, struct file *filp)
811 {
812 SLMP_INFO * info = tty->driver_data;
813
814 if (sanity_check(info, tty->name, "close"))
815 return;
816
817 if (debug_level >= DEBUG_LEVEL_INFO)
818 printk("%s(%d):%s close() entry, count=%d\n",
819 __FILE__,__LINE__, info->device_name, info->port.count);
820
821 if (tty_port_close_start(&info->port, tty, filp) == 0)
822 goto cleanup;
823
824 mutex_lock(&info->port.mutex);
825 if (info->port.flags & ASYNC_INITIALIZED)
826 wait_until_sent(tty, info->timeout);
827
828 flush_buffer(tty);
829 tty_ldisc_flush(tty);
830 shutdown(info);
831 mutex_unlock(&info->port.mutex);
832
833 tty_port_close_end(&info->port, tty);
834 info->port.tty = NULL;
835 cleanup:
836 if (debug_level >= DEBUG_LEVEL_INFO)
837 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
838 tty->driver->name, info->port.count);
839 }
840
841 /* Called by tty_hangup() when a hangup is signaled.
842 * This is the same as closing all open descriptors for the port.
843 */
844 static void hangup(struct tty_struct *tty)
845 {
846 SLMP_INFO *info = tty->driver_data;
847 unsigned long flags;
848
849 if (debug_level >= DEBUG_LEVEL_INFO)
850 printk("%s(%d):%s hangup()\n",
851 __FILE__,__LINE__, info->device_name );
852
853 if (sanity_check(info, tty->name, "hangup"))
854 return;
855
856 mutex_lock(&info->port.mutex);
857 flush_buffer(tty);
858 shutdown(info);
859
860 spin_lock_irqsave(&info->port.lock, flags);
861 info->port.count = 0;
862 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
863 info->port.tty = NULL;
864 spin_unlock_irqrestore(&info->port.lock, flags);
865 mutex_unlock(&info->port.mutex);
866
867 wake_up_interruptible(&info->port.open_wait);
868 }
869
870 /* Set new termios settings
871 */
872 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
873 {
874 SLMP_INFO *info = tty->driver_data;
875 unsigned long flags;
876
877 if (debug_level >= DEBUG_LEVEL_INFO)
878 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
879 tty->driver->name );
880
881 change_params(info);
882
883 /* Handle transition to B0 status */
884 if (old_termios->c_cflag & CBAUD &&
885 !(tty->termios.c_cflag & CBAUD)) {
886 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
887 spin_lock_irqsave(&info->lock,flags);
888 set_signals(info);
889 spin_unlock_irqrestore(&info->lock,flags);
890 }
891
892 /* Handle transition away from B0 status */
893 if (!(old_termios->c_cflag & CBAUD) &&
894 tty->termios.c_cflag & CBAUD) {
895 info->serial_signals |= SerialSignal_DTR;
896 if (!(tty->termios.c_cflag & CRTSCTS) ||
897 !test_bit(TTY_THROTTLED, &tty->flags)) {
898 info->serial_signals |= SerialSignal_RTS;
899 }
900 spin_lock_irqsave(&info->lock,flags);
901 set_signals(info);
902 spin_unlock_irqrestore(&info->lock,flags);
903 }
904
905 /* Handle turning off CRTSCTS */
906 if (old_termios->c_cflag & CRTSCTS &&
907 !(tty->termios.c_cflag & CRTSCTS)) {
908 tty->hw_stopped = 0;
909 tx_release(tty);
910 }
911 }
912
913 /* Send a block of data
914 *
915 * Arguments:
916 *
917 * tty pointer to tty information structure
918 * buf pointer to buffer containing send data
919 * count size of send data in bytes
920 *
921 * Return Value: number of characters written
922 */
923 static int write(struct tty_struct *tty,
924 const unsigned char *buf, int count)
925 {
926 int c, ret = 0;
927 SLMP_INFO *info = tty->driver_data;
928 unsigned long flags;
929
930 if (debug_level >= DEBUG_LEVEL_INFO)
931 printk("%s(%d):%s write() count=%d\n",
932 __FILE__,__LINE__,info->device_name,count);
933
934 if (sanity_check(info, tty->name, "write"))
935 goto cleanup;
936
937 if (!info->tx_buf)
938 goto cleanup;
939
940 if (info->params.mode == MGSL_MODE_HDLC) {
941 if (count > info->max_frame_size) {
942 ret = -EIO;
943 goto cleanup;
944 }
945 if (info->tx_active)
946 goto cleanup;
947 if (info->tx_count) {
948 /* send accumulated data from send_char() calls */
949 /* as frame and wait before accepting more data. */
950 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
951 goto start;
952 }
953 ret = info->tx_count = count;
954 tx_load_dma_buffer(info, buf, count);
955 goto start;
956 }
957
958 for (;;) {
959 c = min_t(int, count,
960 min(info->max_frame_size - info->tx_count - 1,
961 info->max_frame_size - info->tx_put));
962 if (c <= 0)
963 break;
964
965 memcpy(info->tx_buf + info->tx_put, buf, c);
966
967 spin_lock_irqsave(&info->lock,flags);
968 info->tx_put += c;
969 if (info->tx_put >= info->max_frame_size)
970 info->tx_put -= info->max_frame_size;
971 info->tx_count += c;
972 spin_unlock_irqrestore(&info->lock,flags);
973
974 buf += c;
975 count -= c;
976 ret += c;
977 }
978
979 if (info->params.mode == MGSL_MODE_HDLC) {
980 if (count) {
981 ret = info->tx_count = 0;
982 goto cleanup;
983 }
984 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
985 }
986 start:
987 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
988 spin_lock_irqsave(&info->lock,flags);
989 if (!info->tx_active)
990 tx_start(info);
991 spin_unlock_irqrestore(&info->lock,flags);
992 }
993
994 cleanup:
995 if (debug_level >= DEBUG_LEVEL_INFO)
996 printk( "%s(%d):%s write() returning=%d\n",
997 __FILE__,__LINE__,info->device_name,ret);
998 return ret;
999 }
1000
1001 /* Add a character to the transmit buffer.
1002 */
1003 static int put_char(struct tty_struct *tty, unsigned char ch)
1004 {
1005 SLMP_INFO *info = tty->driver_data;
1006 unsigned long flags;
1007 int ret = 0;
1008
1009 if ( debug_level >= DEBUG_LEVEL_INFO ) {
1010 printk( "%s(%d):%s put_char(%d)\n",
1011 __FILE__,__LINE__,info->device_name,ch);
1012 }
1013
1014 if (sanity_check(info, tty->name, "put_char"))
1015 return 0;
1016
1017 if (!info->tx_buf)
1018 return 0;
1019
1020 spin_lock_irqsave(&info->lock,flags);
1021
1022 if ( (info->params.mode != MGSL_MODE_HDLC) ||
1023 !info->tx_active ) {
1024
1025 if (info->tx_count < info->max_frame_size - 1) {
1026 info->tx_buf[info->tx_put++] = ch;
1027 if (info->tx_put >= info->max_frame_size)
1028 info->tx_put -= info->max_frame_size;
1029 info->tx_count++;
1030 ret = 1;
1031 }
1032 }
1033
1034 spin_unlock_irqrestore(&info->lock,flags);
1035 return ret;
1036 }
1037
1038 /* Send a high-priority XON/XOFF character
1039 */
1040 static void send_xchar(struct tty_struct *tty, char ch)
1041 {
1042 SLMP_INFO *info = tty->driver_data;
1043 unsigned long flags;
1044
1045 if (debug_level >= DEBUG_LEVEL_INFO)
1046 printk("%s(%d):%s send_xchar(%d)\n",
1047 __FILE__,__LINE__, info->device_name, ch );
1048
1049 if (sanity_check(info, tty->name, "send_xchar"))
1050 return;
1051
1052 info->x_char = ch;
1053 if (ch) {
1054 /* Make sure transmit interrupts are on */
1055 spin_lock_irqsave(&info->lock,flags);
1056 if (!info->tx_enabled)
1057 tx_start(info);
1058 spin_unlock_irqrestore(&info->lock,flags);
1059 }
1060 }
1061
1062 /* Wait until the transmitter is empty.
1063 */
1064 static void wait_until_sent(struct tty_struct *tty, int timeout)
1065 {
1066 SLMP_INFO * info = tty->driver_data;
1067 unsigned long orig_jiffies, char_time;
1068
1069 if (!info )
1070 return;
1071
1072 if (debug_level >= DEBUG_LEVEL_INFO)
1073 printk("%s(%d):%s wait_until_sent() entry\n",
1074 __FILE__,__LINE__, info->device_name );
1075
1076 if (sanity_check(info, tty->name, "wait_until_sent"))
1077 return;
1078
1079 if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
1080 goto exit;
1081
1082 orig_jiffies = jiffies;
1083
1084 /* Set check interval to 1/5 of estimated time to
1085 * send a character, and make it at least 1. The check
1086 * interval should also be less than the timeout.
1087 * Note: use tight timings here to satisfy the NIST-PCTS.
1088 */
1089
1090 if ( info->params.data_rate ) {
1091 char_time = info->timeout/(32 * 5);
1092 if (!char_time)
1093 char_time++;
1094 } else
1095 char_time = 1;
1096
1097 if (timeout)
1098 char_time = min_t(unsigned long, char_time, timeout);
1099
1100 if ( info->params.mode == MGSL_MODE_HDLC ) {
1101 while (info->tx_active) {
1102 msleep_interruptible(jiffies_to_msecs(char_time));
1103 if (signal_pending(current))
1104 break;
1105 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1106 break;
1107 }
1108 } else {
1109 /*
1110 * TODO: determine if there is something similar to USC16C32
1111 * TXSTATUS_ALL_SENT status
1112 */
1113 while ( info->tx_active && info->tx_enabled) {
1114 msleep_interruptible(jiffies_to_msecs(char_time));
1115 if (signal_pending(current))
1116 break;
1117 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1118 break;
1119 }
1120 }
1121
1122 exit:
1123 if (debug_level >= DEBUG_LEVEL_INFO)
1124 printk("%s(%d):%s wait_until_sent() exit\n",
1125 __FILE__,__LINE__, info->device_name );
1126 }
1127
1128 /* Return the count of free bytes in transmit buffer
1129 */
1130 static int write_room(struct tty_struct *tty)
1131 {
1132 SLMP_INFO *info = tty->driver_data;
1133 int ret;
1134
1135 if (sanity_check(info, tty->name, "write_room"))
1136 return 0;
1137
1138 if (info->params.mode == MGSL_MODE_HDLC) {
1139 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1140 } else {
1141 ret = info->max_frame_size - info->tx_count - 1;
1142 if (ret < 0)
1143 ret = 0;
1144 }
1145
1146 if (debug_level >= DEBUG_LEVEL_INFO)
1147 printk("%s(%d):%s write_room()=%d\n",
1148 __FILE__, __LINE__, info->device_name, ret);
1149
1150 return ret;
1151 }
1152
1153 /* enable transmitter and send remaining buffered characters
1154 */
1155 static void flush_chars(struct tty_struct *tty)
1156 {
1157 SLMP_INFO *info = tty->driver_data;
1158 unsigned long flags;
1159
1160 if ( debug_level >= DEBUG_LEVEL_INFO )
1161 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1162 __FILE__,__LINE__,info->device_name,info->tx_count);
1163
1164 if (sanity_check(info, tty->name, "flush_chars"))
1165 return;
1166
1167 if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1168 !info->tx_buf)
1169 return;
1170
1171 if ( debug_level >= DEBUG_LEVEL_INFO )
1172 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1173 __FILE__,__LINE__,info->device_name );
1174
1175 spin_lock_irqsave(&info->lock,flags);
1176
1177 if (!info->tx_active) {
1178 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1179 info->tx_count ) {
1180 /* operating in synchronous (frame oriented) mode */
1181 /* copy data from circular tx_buf to */
1182 /* transmit DMA buffer. */
1183 tx_load_dma_buffer(info,
1184 info->tx_buf,info->tx_count);
1185 }
1186 tx_start(info);
1187 }
1188
1189 spin_unlock_irqrestore(&info->lock,flags);
1190 }
1191
1192 /* Discard all data in the send buffer
1193 */
1194 static void flush_buffer(struct tty_struct *tty)
1195 {
1196 SLMP_INFO *info = tty->driver_data;
1197 unsigned long flags;
1198
1199 if (debug_level >= DEBUG_LEVEL_INFO)
1200 printk("%s(%d):%s flush_buffer() entry\n",
1201 __FILE__,__LINE__, info->device_name );
1202
1203 if (sanity_check(info, tty->name, "flush_buffer"))
1204 return;
1205
1206 spin_lock_irqsave(&info->lock,flags);
1207 info->tx_count = info->tx_put = info->tx_get = 0;
1208 del_timer(&info->tx_timer);
1209 spin_unlock_irqrestore(&info->lock,flags);
1210
1211 tty_wakeup(tty);
1212 }
1213
1214 /* throttle (stop) transmitter
1215 */
1216 static void tx_hold(struct tty_struct *tty)
1217 {
1218 SLMP_INFO *info = tty->driver_data;
1219 unsigned long flags;
1220
1221 if (sanity_check(info, tty->name, "tx_hold"))
1222 return;
1223
1224 if ( debug_level >= DEBUG_LEVEL_INFO )
1225 printk("%s(%d):%s tx_hold()\n",
1226 __FILE__,__LINE__,info->device_name);
1227
1228 spin_lock_irqsave(&info->lock,flags);
1229 if (info->tx_enabled)
1230 tx_stop(info);
1231 spin_unlock_irqrestore(&info->lock,flags);
1232 }
1233
1234 /* release (start) transmitter
1235 */
1236 static void tx_release(struct tty_struct *tty)
1237 {
1238 SLMP_INFO *info = tty->driver_data;
1239 unsigned long flags;
1240
1241 if (sanity_check(info, tty->name, "tx_release"))
1242 return;
1243
1244 if ( debug_level >= DEBUG_LEVEL_INFO )
1245 printk("%s(%d):%s tx_release()\n",
1246 __FILE__,__LINE__,info->device_name);
1247
1248 spin_lock_irqsave(&info->lock,flags);
1249 if (!info->tx_enabled)
1250 tx_start(info);
1251 spin_unlock_irqrestore(&info->lock,flags);
1252 }
1253
1254 /* Service an IOCTL request
1255 *
1256 * Arguments:
1257 *
1258 * tty pointer to tty instance data
1259 * cmd IOCTL command code
1260 * arg command argument/context
1261 *
1262 * Return Value: 0 if success, otherwise error code
1263 */
1264 static int ioctl(struct tty_struct *tty,
1265 unsigned int cmd, unsigned long arg)
1266 {
1267 SLMP_INFO *info = tty->driver_data;
1268 void __user *argp = (void __user *)arg;
1269
1270 if (debug_level >= DEBUG_LEVEL_INFO)
1271 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1272 info->device_name, cmd );
1273
1274 if (sanity_check(info, tty->name, "ioctl"))
1275 return -ENODEV;
1276
1277 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1278 (cmd != TIOCMIWAIT)) {
1279 if (tty->flags & (1 << TTY_IO_ERROR))
1280 return -EIO;
1281 }
1282
1283 switch (cmd) {
1284 case MGSL_IOCGPARAMS:
1285 return get_params(info, argp);
1286 case MGSL_IOCSPARAMS:
1287 return set_params(info, argp);
1288 case MGSL_IOCGTXIDLE:
1289 return get_txidle(info, argp);
1290 case MGSL_IOCSTXIDLE:
1291 return set_txidle(info, (int)arg);
1292 case MGSL_IOCTXENABLE:
1293 return tx_enable(info, (int)arg);
1294 case MGSL_IOCRXENABLE:
1295 return rx_enable(info, (int)arg);
1296 case MGSL_IOCTXABORT:
1297 return tx_abort(info);
1298 case MGSL_IOCGSTATS:
1299 return get_stats(info, argp);
1300 case MGSL_IOCWAITEVENT:
1301 return wait_mgsl_event(info, argp);
1302 case MGSL_IOCLOOPTXDONE:
1303 return 0; // TODO: Not supported, need to document
1304 /* Wait for modem input (DCD,RI,DSR,CTS) change
1305 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1306 */
1307 case TIOCMIWAIT:
1308 return modem_input_wait(info,(int)arg);
1309
1310 /*
1311 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1312 * Return: write counters to the user passed counter struct
1313 * NB: both 1->0 and 0->1 transitions are counted except for
1314 * RI where only 0->1 is counted.
1315 */
1316 default:
1317 return -ENOIOCTLCMD;
1318 }
1319 return 0;
1320 }
1321
1322 static int get_icount(struct tty_struct *tty,
1323 struct serial_icounter_struct *icount)
1324 {
1325 SLMP_INFO *info = tty->driver_data;
1326 struct mgsl_icount cnow; /* kernel counter temps */
1327 unsigned long flags;
1328
1329 spin_lock_irqsave(&info->lock,flags);
1330 cnow = info->icount;
1331 spin_unlock_irqrestore(&info->lock,flags);
1332
1333 icount->cts = cnow.cts;
1334 icount->dsr = cnow.dsr;
1335 icount->rng = cnow.rng;
1336 icount->dcd = cnow.dcd;
1337 icount->rx = cnow.rx;
1338 icount->tx = cnow.tx;
1339 icount->frame = cnow.frame;
1340 icount->overrun = cnow.overrun;
1341 icount->parity = cnow.parity;
1342 icount->brk = cnow.brk;
1343 icount->buf_overrun = cnow.buf_overrun;
1344
1345 return 0;
1346 }
1347
1348 /*
1349 * /proc fs routines....
1350 */
1351
1352 static inline void line_info(struct seq_file *m, SLMP_INFO *info)
1353 {
1354 char stat_buf[30];
1355 unsigned long flags;
1356
1357 seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1358 "\tIRQ=%d MaxFrameSize=%u\n",
1359 info->device_name,
1360 info->phys_sca_base,
1361 info->phys_memory_base,
1362 info->phys_statctrl_base,
1363 info->phys_lcr_base,
1364 info->irq_level,
1365 info->max_frame_size );
1366
1367 /* output current serial signal states */
1368 spin_lock_irqsave(&info->lock,flags);
1369 get_signals(info);
1370 spin_unlock_irqrestore(&info->lock,flags);
1371
1372 stat_buf[0] = 0;
1373 stat_buf[1] = 0;
1374 if (info->serial_signals & SerialSignal_RTS)
1375 strcat(stat_buf, "|RTS");
1376 if (info->serial_signals & SerialSignal_CTS)
1377 strcat(stat_buf, "|CTS");
1378 if (info->serial_signals & SerialSignal_DTR)
1379 strcat(stat_buf, "|DTR");
1380 if (info->serial_signals & SerialSignal_DSR)
1381 strcat(stat_buf, "|DSR");
1382 if (info->serial_signals & SerialSignal_DCD)
1383 strcat(stat_buf, "|CD");
1384 if (info->serial_signals & SerialSignal_RI)
1385 strcat(stat_buf, "|RI");
1386
1387 if (info->params.mode == MGSL_MODE_HDLC) {
1388 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1389 info->icount.txok, info->icount.rxok);
1390 if (info->icount.txunder)
1391 seq_printf(m, " txunder:%d", info->icount.txunder);
1392 if (info->icount.txabort)
1393 seq_printf(m, " txabort:%d", info->icount.txabort);
1394 if (info->icount.rxshort)
1395 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1396 if (info->icount.rxlong)
1397 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1398 if (info->icount.rxover)
1399 seq_printf(m, " rxover:%d", info->icount.rxover);
1400 if (info->icount.rxcrc)
1401 seq_printf(m, " rxlong:%d", info->icount.rxcrc);
1402 } else {
1403 seq_printf(m, "\tASYNC tx:%d rx:%d",
1404 info->icount.tx, info->icount.rx);
1405 if (info->icount.frame)
1406 seq_printf(m, " fe:%d", info->icount.frame);
1407 if (info->icount.parity)
1408 seq_printf(m, " pe:%d", info->icount.parity);
1409 if (info->icount.brk)
1410 seq_printf(m, " brk:%d", info->icount.brk);
1411 if (info->icount.overrun)
1412 seq_printf(m, " oe:%d", info->icount.overrun);
1413 }
1414
1415 /* Append serial signal status to end */
1416 seq_printf(m, " %s\n", stat_buf+1);
1417
1418 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1419 info->tx_active,info->bh_requested,info->bh_running,
1420 info->pending_bh);
1421 }
1422
1423 /* Called to print information about devices
1424 */
1425 static int synclinkmp_proc_show(struct seq_file *m, void *v)
1426 {
1427 SLMP_INFO *info;
1428
1429 seq_printf(m, "synclinkmp driver:%s\n", driver_version);
1430
1431 info = synclinkmp_device_list;
1432 while( info ) {
1433 line_info(m, info);
1434 info = info->next_device;
1435 }
1436 return 0;
1437 }
1438
1439 static int synclinkmp_proc_open(struct inode *inode, struct file *file)
1440 {
1441 return single_open(file, synclinkmp_proc_show, NULL);
1442 }
1443
1444 static const struct file_operations synclinkmp_proc_fops = {
1445 .owner = THIS_MODULE,
1446 .open = synclinkmp_proc_open,
1447 .read = seq_read,
1448 .llseek = seq_lseek,
1449 .release = single_release,
1450 };
1451
1452 /* Return the count of bytes in transmit buffer
1453 */
1454 static int chars_in_buffer(struct tty_struct *tty)
1455 {
1456 SLMP_INFO *info = tty->driver_data;
1457
1458 if (sanity_check(info, tty->name, "chars_in_buffer"))
1459 return 0;
1460
1461 if (debug_level >= DEBUG_LEVEL_INFO)
1462 printk("%s(%d):%s chars_in_buffer()=%d\n",
1463 __FILE__, __LINE__, info->device_name, info->tx_count);
1464
1465 return info->tx_count;
1466 }
1467
1468 /* Signal remote device to throttle send data (our receive data)
1469 */
1470 static void throttle(struct tty_struct * tty)
1471 {
1472 SLMP_INFO *info = tty->driver_data;
1473 unsigned long flags;
1474
1475 if (debug_level >= DEBUG_LEVEL_INFO)
1476 printk("%s(%d):%s throttle() entry\n",
1477 __FILE__,__LINE__, info->device_name );
1478
1479 if (sanity_check(info, tty->name, "throttle"))
1480 return;
1481
1482 if (I_IXOFF(tty))
1483 send_xchar(tty, STOP_CHAR(tty));
1484
1485 if (tty->termios.c_cflag & CRTSCTS) {
1486 spin_lock_irqsave(&info->lock,flags);
1487 info->serial_signals &= ~SerialSignal_RTS;
1488 set_signals(info);
1489 spin_unlock_irqrestore(&info->lock,flags);
1490 }
1491 }
1492
1493 /* Signal remote device to stop throttling send data (our receive data)
1494 */
1495 static void unthrottle(struct tty_struct * tty)
1496 {
1497 SLMP_INFO *info = tty->driver_data;
1498 unsigned long flags;
1499
1500 if (debug_level >= DEBUG_LEVEL_INFO)
1501 printk("%s(%d):%s unthrottle() entry\n",
1502 __FILE__,__LINE__, info->device_name );
1503
1504 if (sanity_check(info, tty->name, "unthrottle"))
1505 return;
1506
1507 if (I_IXOFF(tty)) {
1508 if (info->x_char)
1509 info->x_char = 0;
1510 else
1511 send_xchar(tty, START_CHAR(tty));
1512 }
1513
1514 if (tty->termios.c_cflag & CRTSCTS) {
1515 spin_lock_irqsave(&info->lock,flags);
1516 info->serial_signals |= SerialSignal_RTS;
1517 set_signals(info);
1518 spin_unlock_irqrestore(&info->lock,flags);
1519 }
1520 }
1521
1522 /* set or clear transmit break condition
1523 * break_state -1=set break condition, 0=clear
1524 */
1525 static int set_break(struct tty_struct *tty, int break_state)
1526 {
1527 unsigned char RegValue;
1528 SLMP_INFO * info = tty->driver_data;
1529 unsigned long flags;
1530
1531 if (debug_level >= DEBUG_LEVEL_INFO)
1532 printk("%s(%d):%s set_break(%d)\n",
1533 __FILE__,__LINE__, info->device_name, break_state);
1534
1535 if (sanity_check(info, tty->name, "set_break"))
1536 return -EINVAL;
1537
1538 spin_lock_irqsave(&info->lock,flags);
1539 RegValue = read_reg(info, CTL);
1540 if (break_state == -1)
1541 RegValue |= BIT3;
1542 else
1543 RegValue &= ~BIT3;
1544 write_reg(info, CTL, RegValue);
1545 spin_unlock_irqrestore(&info->lock,flags);
1546 return 0;
1547 }
1548
1549 #if SYNCLINK_GENERIC_HDLC
1550
1551 /**
1552 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1553 * set encoding and frame check sequence (FCS) options
1554 *
1555 * dev pointer to network device structure
1556 * encoding serial encoding setting
1557 * parity FCS setting
1558 *
1559 * returns 0 if success, otherwise error code
1560 */
1561 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1562 unsigned short parity)
1563 {
1564 SLMP_INFO *info = dev_to_port(dev);
1565 unsigned char new_encoding;
1566 unsigned short new_crctype;
1567
1568 /* return error if TTY interface open */
1569 if (info->port.count)
1570 return -EBUSY;
1571
1572 switch (encoding)
1573 {
1574 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1575 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1576 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1577 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1578 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1579 default: return -EINVAL;
1580 }
1581
1582 switch (parity)
1583 {
1584 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1585 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1586 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1587 default: return -EINVAL;
1588 }
1589
1590 info->params.encoding = new_encoding;
1591 info->params.crc_type = new_crctype;
1592
1593 /* if network interface up, reprogram hardware */
1594 if (info->netcount)
1595 program_hw(info);
1596
1597 return 0;
1598 }
1599
1600 /**
1601 * called by generic HDLC layer to send frame
1602 *
1603 * skb socket buffer containing HDLC frame
1604 * dev pointer to network device structure
1605 */
1606 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1607 struct net_device *dev)
1608 {
1609 SLMP_INFO *info = dev_to_port(dev);
1610 unsigned long flags;
1611
1612 if (debug_level >= DEBUG_LEVEL_INFO)
1613 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1614
1615 /* stop sending until this frame completes */
1616 netif_stop_queue(dev);
1617
1618 /* copy data to device buffers */
1619 info->tx_count = skb->len;
1620 tx_load_dma_buffer(info, skb->data, skb->len);
1621
1622 /* update network statistics */
1623 dev->stats.tx_packets++;
1624 dev->stats.tx_bytes += skb->len;
1625
1626 /* done with socket buffer, so free it */
1627 dev_kfree_skb(skb);
1628
1629 /* save start time for transmit timeout detection */
1630 dev->trans_start = jiffies;
1631
1632 /* start hardware transmitter if necessary */
1633 spin_lock_irqsave(&info->lock,flags);
1634 if (!info->tx_active)
1635 tx_start(info);
1636 spin_unlock_irqrestore(&info->lock,flags);
1637
1638 return NETDEV_TX_OK;
1639 }
1640
1641 /**
1642 * called by network layer when interface enabled
1643 * claim resources and initialize hardware
1644 *
1645 * dev pointer to network device structure
1646 *
1647 * returns 0 if success, otherwise error code
1648 */
1649 static int hdlcdev_open(struct net_device *dev)
1650 {
1651 SLMP_INFO *info = dev_to_port(dev);
1652 int rc;
1653 unsigned long flags;
1654
1655 if (debug_level >= DEBUG_LEVEL_INFO)
1656 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1657
1658 /* generic HDLC layer open processing */
1659 if ((rc = hdlc_open(dev)))
1660 return rc;
1661
1662 /* arbitrate between network and tty opens */
1663 spin_lock_irqsave(&info->netlock, flags);
1664 if (info->port.count != 0 || info->netcount != 0) {
1665 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1666 spin_unlock_irqrestore(&info->netlock, flags);
1667 return -EBUSY;
1668 }
1669 info->netcount=1;
1670 spin_unlock_irqrestore(&info->netlock, flags);
1671
1672 /* claim resources and init adapter */
1673 if ((rc = startup(info)) != 0) {
1674 spin_lock_irqsave(&info->netlock, flags);
1675 info->netcount=0;
1676 spin_unlock_irqrestore(&info->netlock, flags);
1677 return rc;
1678 }
1679
1680 /* assert DTR and RTS, apply hardware settings */
1681 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1682 program_hw(info);
1683
1684 /* enable network layer transmit */
1685 dev->trans_start = jiffies;
1686 netif_start_queue(dev);
1687
1688 /* inform generic HDLC layer of current DCD status */
1689 spin_lock_irqsave(&info->lock, flags);
1690 get_signals(info);
1691 spin_unlock_irqrestore(&info->lock, flags);
1692 if (info->serial_signals & SerialSignal_DCD)
1693 netif_carrier_on(dev);
1694 else
1695 netif_carrier_off(dev);
1696 return 0;
1697 }
1698
1699 /**
1700 * called by network layer when interface is disabled
1701 * shutdown hardware and release resources
1702 *
1703 * dev pointer to network device structure
1704 *
1705 * returns 0 if success, otherwise error code
1706 */
1707 static int hdlcdev_close(struct net_device *dev)
1708 {
1709 SLMP_INFO *info = dev_to_port(dev);
1710 unsigned long flags;
1711
1712 if (debug_level >= DEBUG_LEVEL_INFO)
1713 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1714
1715 netif_stop_queue(dev);
1716
1717 /* shutdown adapter and release resources */
1718 shutdown(info);
1719
1720 hdlc_close(dev);
1721
1722 spin_lock_irqsave(&info->netlock, flags);
1723 info->netcount=0;
1724 spin_unlock_irqrestore(&info->netlock, flags);
1725
1726 return 0;
1727 }
1728
1729 /**
1730 * called by network layer to process IOCTL call to network device
1731 *
1732 * dev pointer to network device structure
1733 * ifr pointer to network interface request structure
1734 * cmd IOCTL command code
1735 *
1736 * returns 0 if success, otherwise error code
1737 */
1738 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1739 {
1740 const size_t size = sizeof(sync_serial_settings);
1741 sync_serial_settings new_line;
1742 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1743 SLMP_INFO *info = dev_to_port(dev);
1744 unsigned int flags;
1745
1746 if (debug_level >= DEBUG_LEVEL_INFO)
1747 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1748
1749 /* return error if TTY interface open */
1750 if (info->port.count)
1751 return -EBUSY;
1752
1753 if (cmd != SIOCWANDEV)
1754 return hdlc_ioctl(dev, ifr, cmd);
1755
1756 switch(ifr->ifr_settings.type) {
1757 case IF_GET_IFACE: /* return current sync_serial_settings */
1758
1759 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1760 if (ifr->ifr_settings.size < size) {
1761 ifr->ifr_settings.size = size; /* data size wanted */
1762 return -ENOBUFS;
1763 }
1764
1765 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1766 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1767 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1768 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1769
1770 switch (flags){
1771 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1772 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1773 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1774 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1775 default: new_line.clock_type = CLOCK_DEFAULT;
1776 }
1777
1778 new_line.clock_rate = info->params.clock_speed;
1779 new_line.loopback = info->params.loopback ? 1:0;
1780
1781 if (copy_to_user(line, &new_line, size))
1782 return -EFAULT;
1783 return 0;
1784
1785 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1786
1787 if(!capable(CAP_NET_ADMIN))
1788 return -EPERM;
1789 if (copy_from_user(&new_line, line, size))
1790 return -EFAULT;
1791
1792 switch (new_line.clock_type)
1793 {
1794 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1795 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1796 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1797 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1798 case CLOCK_DEFAULT: flags = info->params.flags &
1799 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1800 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1801 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1802 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1803 default: return -EINVAL;
1804 }
1805
1806 if (new_line.loopback != 0 && new_line.loopback != 1)
1807 return -EINVAL;
1808
1809 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1810 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1811 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1812 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1813 info->params.flags |= flags;
1814
1815 info->params.loopback = new_line.loopback;
1816
1817 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1818 info->params.clock_speed = new_line.clock_rate;
1819 else
1820 info->params.clock_speed = 0;
1821
1822 /* if network interface up, reprogram hardware */
1823 if (info->netcount)
1824 program_hw(info);
1825 return 0;
1826
1827 default:
1828 return hdlc_ioctl(dev, ifr, cmd);
1829 }
1830 }
1831
1832 /**
1833 * called by network layer when transmit timeout is detected
1834 *
1835 * dev pointer to network device structure
1836 */
1837 static void hdlcdev_tx_timeout(struct net_device *dev)
1838 {
1839 SLMP_INFO *info = dev_to_port(dev);
1840 unsigned long flags;
1841
1842 if (debug_level >= DEBUG_LEVEL_INFO)
1843 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1844
1845 dev->stats.tx_errors++;
1846 dev->stats.tx_aborted_errors++;
1847
1848 spin_lock_irqsave(&info->lock,flags);
1849 tx_stop(info);
1850 spin_unlock_irqrestore(&info->lock,flags);
1851
1852 netif_wake_queue(dev);
1853 }
1854
1855 /**
1856 * called by device driver when transmit completes
1857 * reenable network layer transmit if stopped
1858 *
1859 * info pointer to device instance information
1860 */
1861 static void hdlcdev_tx_done(SLMP_INFO *info)
1862 {
1863 if (netif_queue_stopped(info->netdev))
1864 netif_wake_queue(info->netdev);
1865 }
1866
1867 /**
1868 * called by device driver when frame received
1869 * pass frame to network layer
1870 *
1871 * info pointer to device instance information
1872 * buf pointer to buffer contianing frame data
1873 * size count of data bytes in buf
1874 */
1875 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1876 {
1877 struct sk_buff *skb = dev_alloc_skb(size);
1878 struct net_device *dev = info->netdev;
1879
1880 if (debug_level >= DEBUG_LEVEL_INFO)
1881 printk("hdlcdev_rx(%s)\n",dev->name);
1882
1883 if (skb == NULL) {
1884 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1885 dev->name);
1886 dev->stats.rx_dropped++;
1887 return;
1888 }
1889
1890 memcpy(skb_put(skb, size), buf, size);
1891
1892 skb->protocol = hdlc_type_trans(skb, dev);
1893
1894 dev->stats.rx_packets++;
1895 dev->stats.rx_bytes += size;
1896
1897 netif_rx(skb);
1898 }
1899
1900 static const struct net_device_ops hdlcdev_ops = {
1901 .ndo_open = hdlcdev_open,
1902 .ndo_stop = hdlcdev_close,
1903 .ndo_change_mtu = hdlc_change_mtu,
1904 .ndo_start_xmit = hdlc_start_xmit,
1905 .ndo_do_ioctl = hdlcdev_ioctl,
1906 .ndo_tx_timeout = hdlcdev_tx_timeout,
1907 };
1908
1909 /**
1910 * called by device driver when adding device instance
1911 * do generic HDLC initialization
1912 *
1913 * info pointer to device instance information
1914 *
1915 * returns 0 if success, otherwise error code
1916 */
1917 static int hdlcdev_init(SLMP_INFO *info)
1918 {
1919 int rc;
1920 struct net_device *dev;
1921 hdlc_device *hdlc;
1922
1923 /* allocate and initialize network and HDLC layer objects */
1924
1925 if (!(dev = alloc_hdlcdev(info))) {
1926 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1927 return -ENOMEM;
1928 }
1929
1930 /* for network layer reporting purposes only */
1931 dev->mem_start = info->phys_sca_base;
1932 dev->mem_end = info->phys_sca_base + SCA_BASE_SIZE - 1;
1933 dev->irq = info->irq_level;
1934
1935 /* network layer callbacks and settings */
1936 dev->netdev_ops = &hdlcdev_ops;
1937 dev->watchdog_timeo = 10 * HZ;
1938 dev->tx_queue_len = 50;
1939
1940 /* generic HDLC layer callbacks and settings */
1941 hdlc = dev_to_hdlc(dev);
1942 hdlc->attach = hdlcdev_attach;
1943 hdlc->xmit = hdlcdev_xmit;
1944
1945 /* register objects with HDLC layer */
1946 if ((rc = register_hdlc_device(dev))) {
1947 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1948 free_netdev(dev);
1949 return rc;
1950 }
1951
1952 info->netdev = dev;
1953 return 0;
1954 }
1955
1956 /**
1957 * called by device driver when removing device instance
1958 * do generic HDLC cleanup
1959 *
1960 * info pointer to device instance information
1961 */
1962 static void hdlcdev_exit(SLMP_INFO *info)
1963 {
1964 unregister_hdlc_device(info->netdev);
1965 free_netdev(info->netdev);
1966 info->netdev = NULL;
1967 }
1968
1969 #endif /* CONFIG_HDLC */
1970
1971
1972 /* Return next bottom half action to perform.
1973 * Return Value: BH action code or 0 if nothing to do.
1974 */
1975 static int bh_action(SLMP_INFO *info)
1976 {
1977 unsigned long flags;
1978 int rc = 0;
1979
1980 spin_lock_irqsave(&info->lock,flags);
1981
1982 if (info->pending_bh & BH_RECEIVE) {
1983 info->pending_bh &= ~BH_RECEIVE;
1984 rc = BH_RECEIVE;
1985 } else if (info->pending_bh & BH_TRANSMIT) {
1986 info->pending_bh &= ~BH_TRANSMIT;
1987 rc = BH_TRANSMIT;
1988 } else if (info->pending_bh & BH_STATUS) {
1989 info->pending_bh &= ~BH_STATUS;
1990 rc = BH_STATUS;
1991 }
1992
1993 if (!rc) {
1994 /* Mark BH routine as complete */
1995 info->bh_running = false;
1996 info->bh_requested = false;
1997 }
1998
1999 spin_unlock_irqrestore(&info->lock,flags);
2000
2001 return rc;
2002 }
2003
2004 /* Perform bottom half processing of work items queued by ISR.
2005 */
2006 static void bh_handler(struct work_struct *work)
2007 {
2008 SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2009 int action;
2010
2011 if (!info)
2012 return;
2013
2014 if ( debug_level >= DEBUG_LEVEL_BH )
2015 printk( "%s(%d):%s bh_handler() entry\n",
2016 __FILE__,__LINE__,info->device_name);
2017
2018 info->bh_running = true;
2019
2020 while((action = bh_action(info)) != 0) {
2021
2022 /* Process work item */
2023 if ( debug_level >= DEBUG_LEVEL_BH )
2024 printk( "%s(%d):%s bh_handler() work item action=%d\n",
2025 __FILE__,__LINE__,info->device_name, action);
2026
2027 switch (action) {
2028
2029 case BH_RECEIVE:
2030 bh_receive(info);
2031 break;
2032 case BH_TRANSMIT:
2033 bh_transmit(info);
2034 break;
2035 case BH_STATUS:
2036 bh_status(info);
2037 break;
2038 default:
2039 /* unknown work item ID */
2040 printk("%s(%d):%s Unknown work item ID=%08X!\n",
2041 __FILE__,__LINE__,info->device_name,action);
2042 break;
2043 }
2044 }
2045
2046 if ( debug_level >= DEBUG_LEVEL_BH )
2047 printk( "%s(%d):%s bh_handler() exit\n",
2048 __FILE__,__LINE__,info->device_name);
2049 }
2050
2051 static void bh_receive(SLMP_INFO *info)
2052 {
2053 if ( debug_level >= DEBUG_LEVEL_BH )
2054 printk( "%s(%d):%s bh_receive()\n",
2055 __FILE__,__LINE__,info->device_name);
2056
2057 while( rx_get_frame(info) );
2058 }
2059
2060 static void bh_transmit(SLMP_INFO *info)
2061 {
2062 struct tty_struct *tty = info->port.tty;
2063
2064 if ( debug_level >= DEBUG_LEVEL_BH )
2065 printk( "%s(%d):%s bh_transmit() entry\n",
2066 __FILE__,__LINE__,info->device_name);
2067
2068 if (tty)
2069 tty_wakeup(tty);
2070 }
2071
2072 static void bh_status(SLMP_INFO *info)
2073 {
2074 if ( debug_level >= DEBUG_LEVEL_BH )
2075 printk( "%s(%d):%s bh_status() entry\n",
2076 __FILE__,__LINE__,info->device_name);
2077
2078 info->ri_chkcount = 0;
2079 info->dsr_chkcount = 0;
2080 info->dcd_chkcount = 0;
2081 info->cts_chkcount = 0;
2082 }
2083
2084 static void isr_timer(SLMP_INFO * info)
2085 {
2086 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2087
2088 /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2089 write_reg(info, IER2, 0);
2090
2091 /* TMCS, Timer Control/Status Register
2092 *
2093 * 07 CMF, Compare match flag (read only) 1=match
2094 * 06 ECMI, CMF Interrupt Enable: 0=disabled
2095 * 05 Reserved, must be 0
2096 * 04 TME, Timer Enable
2097 * 03..00 Reserved, must be 0
2098 *
2099 * 0000 0000
2100 */
2101 write_reg(info, (unsigned char)(timer + TMCS), 0);
2102
2103 info->irq_occurred = true;
2104
2105 if ( debug_level >= DEBUG_LEVEL_ISR )
2106 printk("%s(%d):%s isr_timer()\n",
2107 __FILE__,__LINE__,info->device_name);
2108 }
2109
2110 static void isr_rxint(SLMP_INFO * info)
2111 {
2112 struct tty_struct *tty = info->port.tty;
2113 struct mgsl_icount *icount = &info->icount;
2114 unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2115 unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2116
2117 /* clear status bits */
2118 if (status)
2119 write_reg(info, SR1, status);
2120
2121 if (status2)
2122 write_reg(info, SR2, status2);
2123
2124 if ( debug_level >= DEBUG_LEVEL_ISR )
2125 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2126 __FILE__,__LINE__,info->device_name,status,status2);
2127
2128 if (info->params.mode == MGSL_MODE_ASYNC) {
2129 if (status & BRKD) {
2130 icount->brk++;
2131
2132 /* process break detection if tty control
2133 * is not set to ignore it
2134 */
2135 if ( tty ) {
2136 if (!(status & info->ignore_status_mask1)) {
2137 if (info->read_status_mask1 & BRKD) {
2138 tty_insert_flip_char(tty, 0, TTY_BREAK);
2139 if (info->port.flags & ASYNC_SAK)
2140 do_SAK(tty);
2141 }
2142 }
2143 }
2144 }
2145 }
2146 else {
2147 if (status & (FLGD|IDLD)) {
2148 if (status & FLGD)
2149 info->icount.exithunt++;
2150 else if (status & IDLD)
2151 info->icount.rxidle++;
2152 wake_up_interruptible(&info->event_wait_q);
2153 }
2154 }
2155
2156 if (status & CDCD) {
2157 /* simulate a common modem status change interrupt
2158 * for our handler
2159 */
2160 get_signals( info );
2161 isr_io_pin(info,
2162 MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2163 }
2164 }
2165
2166 /*
2167 * handle async rx data interrupts
2168 */
2169 static void isr_rxrdy(SLMP_INFO * info)
2170 {
2171 u16 status;
2172 unsigned char DataByte;
2173 struct tty_struct *tty = info->port.tty;
2174 struct mgsl_icount *icount = &info->icount;
2175
2176 if ( debug_level >= DEBUG_LEVEL_ISR )
2177 printk("%s(%d):%s isr_rxrdy\n",
2178 __FILE__,__LINE__,info->device_name);
2179
2180 while((status = read_reg(info,CST0)) & BIT0)
2181 {
2182 int flag = 0;
2183 bool over = false;
2184 DataByte = read_reg(info,TRB);
2185
2186 icount->rx++;
2187
2188 if ( status & (PE + FRME + OVRN) ) {
2189 printk("%s(%d):%s rxerr=%04X\n",
2190 __FILE__,__LINE__,info->device_name,status);
2191
2192 /* update error statistics */
2193 if (status & PE)
2194 icount->parity++;
2195 else if (status & FRME)
2196 icount->frame++;
2197 else if (status & OVRN)
2198 icount->overrun++;
2199
2200 /* discard char if tty control flags say so */
2201 if (status & info->ignore_status_mask2)
2202 continue;
2203
2204 status &= info->read_status_mask2;
2205
2206 if ( tty ) {
2207 if (status & PE)
2208 flag = TTY_PARITY;
2209 else if (status & FRME)
2210 flag = TTY_FRAME;
2211 if (status & OVRN) {
2212 /* Overrun is special, since it's
2213 * reported immediately, and doesn't
2214 * affect the current character
2215 */
2216 over = true;
2217 }
2218 }
2219 } /* end of if (error) */
2220
2221 if ( tty ) {
2222 tty_insert_flip_char(tty, DataByte, flag);
2223 if (over)
2224 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2225 }
2226 }
2227
2228 if ( debug_level >= DEBUG_LEVEL_ISR ) {
2229 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2230 __FILE__,__LINE__,info->device_name,
2231 icount->rx,icount->brk,icount->parity,
2232 icount->frame,icount->overrun);
2233 }
2234
2235 if ( tty )
2236 tty_flip_buffer_push(tty);
2237 }
2238
2239 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2240 {
2241 if ( debug_level >= DEBUG_LEVEL_ISR )
2242 printk("%s(%d):%s isr_txeom status=%02x\n",
2243 __FILE__,__LINE__,info->device_name,status);
2244
2245 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2246 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2247 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2248
2249 if (status & UDRN) {
2250 write_reg(info, CMD, TXRESET);
2251 write_reg(info, CMD, TXENABLE);
2252 } else
2253 write_reg(info, CMD, TXBUFCLR);
2254
2255 /* disable and clear tx interrupts */
2256 info->ie0_value &= ~TXRDYE;
2257 info->ie1_value &= ~(IDLE + UDRN);
2258 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2259 write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2260
2261 if ( info->tx_active ) {
2262 if (info->params.mode != MGSL_MODE_ASYNC) {
2263 if (status & UDRN)
2264 info->icount.txunder++;
2265 else if (status & IDLE)
2266 info->icount.txok++;
2267 }
2268
2269 info->tx_active = false;
2270 info->tx_count = info->tx_put = info->tx_get = 0;
2271
2272 del_timer(&info->tx_timer);
2273
2274 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2275 info->serial_signals &= ~SerialSignal_RTS;
2276 info->drop_rts_on_tx_done = false;
2277 set_signals(info);
2278 }
2279
2280 #if SYNCLINK_GENERIC_HDLC
2281 if (info->netcount)
2282 hdlcdev_tx_done(info);
2283 else
2284 #endif
2285 {
2286 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2287 tx_stop(info);
2288 return;
2289 }
2290 info->pending_bh |= BH_TRANSMIT;
2291 }
2292 }
2293 }
2294
2295
2296 /*
2297 * handle tx status interrupts
2298 */
2299 static void isr_txint(SLMP_INFO * info)
2300 {
2301 unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2302
2303 /* clear status bits */
2304 write_reg(info, SR1, status);
2305
2306 if ( debug_level >= DEBUG_LEVEL_ISR )
2307 printk("%s(%d):%s isr_txint status=%02x\n",
2308 __FILE__,__LINE__,info->device_name,status);
2309
2310 if (status & (UDRN + IDLE))
2311 isr_txeom(info, status);
2312
2313 if (status & CCTS) {
2314 /* simulate a common modem status change interrupt
2315 * for our handler
2316 */
2317 get_signals( info );
2318 isr_io_pin(info,
2319 MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2320
2321 }
2322 }
2323
2324 /*
2325 * handle async tx data interrupts
2326 */
2327 static void isr_txrdy(SLMP_INFO * info)
2328 {
2329 if ( debug_level >= DEBUG_LEVEL_ISR )
2330 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2331 __FILE__,__LINE__,info->device_name,info->tx_count);
2332
2333 if (info->params.mode != MGSL_MODE_ASYNC) {
2334 /* disable TXRDY IRQ, enable IDLE IRQ */
2335 info->ie0_value &= ~TXRDYE;
2336 info->ie1_value |= IDLE;
2337 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2338 return;
2339 }
2340
2341 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2342 tx_stop(info);
2343 return;
2344 }
2345
2346 if ( info->tx_count )
2347 tx_load_fifo( info );
2348 else {
2349 info->tx_active = false;
2350 info->ie0_value &= ~TXRDYE;
2351 write_reg(info, IE0, info->ie0_value);
2352 }
2353
2354 if (info->tx_count < WAKEUP_CHARS)
2355 info->pending_bh |= BH_TRANSMIT;
2356 }
2357
2358 static void isr_rxdmaok(SLMP_INFO * info)
2359 {
2360 /* BIT7 = EOT (end of transfer)
2361 * BIT6 = EOM (end of message/frame)
2362 */
2363 unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2364
2365 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2366 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2367
2368 if ( debug_level >= DEBUG_LEVEL_ISR )
2369 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2370 __FILE__,__LINE__,info->device_name,status);
2371
2372 info->pending_bh |= BH_RECEIVE;
2373 }
2374
2375 static void isr_rxdmaerror(SLMP_INFO * info)
2376 {
2377 /* BIT5 = BOF (buffer overflow)
2378 * BIT4 = COF (counter overflow)
2379 */
2380 unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2381
2382 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2383 write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2384
2385 if ( debug_level >= DEBUG_LEVEL_ISR )
2386 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2387 __FILE__,__LINE__,info->device_name,status);
2388
2389 info->rx_overflow = true;
2390 info->pending_bh |= BH_RECEIVE;
2391 }
2392
2393 static void isr_txdmaok(SLMP_INFO * info)
2394 {
2395 unsigned char status_reg1 = read_reg(info, SR1);
2396
2397 write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2398 write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2399 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2400
2401 if ( debug_level >= DEBUG_LEVEL_ISR )
2402 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2403 __FILE__,__LINE__,info->device_name,status_reg1);
2404
2405 /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2406 write_reg16(info, TRC0, 0);
2407 info->ie0_value |= TXRDYE;
2408 write_reg(info, IE0, info->ie0_value);
2409 }
2410
2411 static void isr_txdmaerror(SLMP_INFO * info)
2412 {
2413 /* BIT5 = BOF (buffer overflow)
2414 * BIT4 = COF (counter overflow)
2415 */
2416 unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2417
2418 /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2419 write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2420
2421 if ( debug_level >= DEBUG_LEVEL_ISR )
2422 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2423 __FILE__,__LINE__,info->device_name,status);
2424 }
2425
2426 /* handle input serial signal changes
2427 */
2428 static void isr_io_pin( SLMP_INFO *info, u16 status )
2429 {
2430 struct mgsl_icount *icount;
2431
2432 if ( debug_level >= DEBUG_LEVEL_ISR )
2433 printk("%s(%d):isr_io_pin status=%04X\n",
2434 __FILE__,__LINE__,status);
2435
2436 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2437 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2438 icount = &info->icount;
2439 /* update input line counters */
2440 if (status & MISCSTATUS_RI_LATCHED) {
2441 icount->rng++;
2442 if ( status & SerialSignal_RI )
2443 info->input_signal_events.ri_up++;
2444 else
2445 info->input_signal_events.ri_down++;
2446 }
2447 if (status & MISCSTATUS_DSR_LATCHED) {
2448 icount->dsr++;
2449 if ( status & SerialSignal_DSR )
2450 info->input_signal_events.dsr_up++;
2451 else
2452 info->input_signal_events.dsr_down++;
2453 }
2454 if (status & MISCSTATUS_DCD_LATCHED) {
2455 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2456 info->ie1_value &= ~CDCD;
2457 write_reg(info, IE1, info->ie1_value);
2458 }
2459 icount->dcd++;
2460 if (status & SerialSignal_DCD) {
2461 info->input_signal_events.dcd_up++;
2462 } else
2463 info->input_signal_events.dcd_down++;
2464 #if SYNCLINK_GENERIC_HDLC
2465 if (info->netcount) {
2466 if (status & SerialSignal_DCD)
2467 netif_carrier_on(info->netdev);
2468 else
2469 netif_carrier_off(info->netdev);
2470 }
2471 #endif
2472 }
2473 if (status & MISCSTATUS_CTS_LATCHED)
2474 {
2475 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2476 info->ie1_value &= ~CCTS;
2477 write_reg(info, IE1, info->ie1_value);
2478 }
2479 icount->cts++;
2480 if ( status & SerialSignal_CTS )
2481 info->input_signal_events.cts_up++;
2482 else
2483 info->input_signal_events.cts_down++;
2484 }
2485 wake_up_interruptible(&info->status_event_wait_q);
2486 wake_up_interruptible(&info->event_wait_q);
2487
2488 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2489 (status & MISCSTATUS_DCD_LATCHED) ) {
2490 if ( debug_level >= DEBUG_LEVEL_ISR )
2491 printk("%s CD now %s...", info->device_name,
2492 (status & SerialSignal_DCD) ? "on" : "off");
2493 if (status & SerialSignal_DCD)
2494 wake_up_interruptible(&info->port.open_wait);
2495 else {
2496 if ( debug_level >= DEBUG_LEVEL_ISR )
2497 printk("doing serial hangup...");
2498 if (info->port.tty)
2499 tty_hangup(info->port.tty);
2500 }
2501 }
2502
2503 if (tty_port_cts_enabled(&info->port) &&
2504 (status & MISCSTATUS_CTS_LATCHED) ) {
2505 if ( info->port.tty ) {
2506 if (info->port.tty->hw_stopped) {
2507 if (status & SerialSignal_CTS) {
2508 if ( debug_level >= DEBUG_LEVEL_ISR )
2509 printk("CTS tx start...");
2510 info->port.tty->hw_stopped = 0;
2511 tx_start(info);
2512 info->pending_bh |= BH_TRANSMIT;
2513 return;
2514 }
2515 } else {
2516 if (!(status & SerialSignal_CTS)) {
2517 if ( debug_level >= DEBUG_LEVEL_ISR )
2518 printk("CTS tx stop...");
2519 info->port.tty->hw_stopped = 1;
2520 tx_stop(info);
2521 }
2522 }
2523 }
2524 }
2525 }
2526
2527 info->pending_bh |= BH_STATUS;
2528 }
2529
2530 /* Interrupt service routine entry point.
2531 *
2532 * Arguments:
2533 * irq interrupt number that caused interrupt
2534 * dev_id device ID supplied during interrupt registration
2535 * regs interrupted processor context
2536 */
2537 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2538 {
2539 SLMP_INFO *info = dev_id;
2540 unsigned char status, status0, status1=0;
2541 unsigned char dmastatus, dmastatus0, dmastatus1=0;
2542 unsigned char timerstatus0, timerstatus1=0;
2543 unsigned char shift;
2544 unsigned int i;
2545 unsigned short tmp;
2546
2547 if ( debug_level >= DEBUG_LEVEL_ISR )
2548 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2549 __FILE__, __LINE__, info->irq_level);
2550
2551 spin_lock(&info->lock);
2552
2553 for(;;) {
2554
2555 /* get status for SCA0 (ports 0-1) */
2556 tmp = read_reg16(info, ISR0); /* get ISR0 and ISR1 in one read */
2557 status0 = (unsigned char)tmp;
2558 dmastatus0 = (unsigned char)(tmp>>8);
2559 timerstatus0 = read_reg(info, ISR2);
2560
2561 if ( debug_level >= DEBUG_LEVEL_ISR )
2562 printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2563 __FILE__, __LINE__, info->device_name,
2564 status0, dmastatus0, timerstatus0);
2565
2566 if (info->port_count == 4) {
2567 /* get status for SCA1 (ports 2-3) */
2568 tmp = read_reg16(info->port_array[2], ISR0);
2569 status1 = (unsigned char)tmp;
2570 dmastatus1 = (unsigned char)(tmp>>8);
2571 timerstatus1 = read_reg(info->port_array[2], ISR2);
2572
2573 if ( debug_level >= DEBUG_LEVEL_ISR )
2574 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2575 __FILE__,__LINE__,info->device_name,
2576 status1,dmastatus1,timerstatus1);
2577 }
2578
2579 if (!status0 && !dmastatus0 && !timerstatus0 &&
2580 !status1 && !dmastatus1 && !timerstatus1)
2581 break;
2582
2583 for(i=0; i < info->port_count ; i++) {
2584 if (info->port_array[i] == NULL)
2585 continue;
2586 if (i < 2) {
2587 status = status0;
2588 dmastatus = dmastatus0;
2589 } else {
2590 status = status1;
2591 dmastatus = dmastatus1;
2592 }
2593
2594 shift = i & 1 ? 4 :0;
2595
2596 if (status & BIT0 << shift)
2597 isr_rxrdy(info->port_array[i]);
2598 if (status & BIT1 << shift)
2599 isr_txrdy(info->port_array[i]);
2600 if (status & BIT2 << shift)
2601 isr_rxint(info->port_array[i]);
2602 if (status & BIT3 << shift)
2603 isr_txint(info->port_array[i]);
2604
2605 if (dmastatus & BIT0 << shift)
2606 isr_rxdmaerror(info->port_array[i]);
2607 if (dmastatus & BIT1 << shift)
2608 isr_rxdmaok(info->port_array[i]);
2609 if (dmastatus & BIT2 << shift)
2610 isr_txdmaerror(info->port_array[i]);
2611 if (dmastatus & BIT3 << shift)
2612 isr_txdmaok(info->port_array[i]);
2613 }
2614
2615 if (timerstatus0 & (BIT5 | BIT4))
2616 isr_timer(info->port_array[0]);
2617 if (timerstatus0 & (BIT7 | BIT6))
2618 isr_timer(info->port_array[1]);
2619 if (timerstatus1 & (BIT5 | BIT4))
2620 isr_timer(info->port_array[2]);
2621 if (timerstatus1 & (BIT7 | BIT6))
2622 isr_timer(info->port_array[3]);
2623 }
2624
2625 for(i=0; i < info->port_count ; i++) {
2626 SLMP_INFO * port = info->port_array[i];
2627
2628 /* Request bottom half processing if there's something
2629 * for it to do and the bh is not already running.
2630 *
2631 * Note: startup adapter diags require interrupts.
2632 * do not request bottom half processing if the
2633 * device is not open in a normal mode.
2634 */
2635 if ( port && (port->port.count || port->netcount) &&
2636 port->pending_bh && !port->bh_running &&
2637 !port->bh_requested ) {
2638 if ( debug_level >= DEBUG_LEVEL_ISR )
2639 printk("%s(%d):%s queueing bh task.\n",
2640 __FILE__,__LINE__,port->device_name);
2641 schedule_work(&port->task);
2642 port->bh_requested = true;
2643 }
2644 }
2645
2646 spin_unlock(&info->lock);
2647
2648 if ( debug_level >= DEBUG_LEVEL_ISR )
2649 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2650 __FILE__, __LINE__, info->irq_level);
2651 return IRQ_HANDLED;
2652 }
2653
2654 /* Initialize and start device.
2655 */
2656 static int startup(SLMP_INFO * info)
2657 {
2658 if ( debug_level >= DEBUG_LEVEL_INFO )
2659 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2660
2661 if (info->port.flags & ASYNC_INITIALIZED)
2662 return 0;
2663
2664 if (!info->tx_buf) {
2665 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2666 if (!info->tx_buf) {
2667 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2668 __FILE__,__LINE__,info->device_name);
2669 return -ENOMEM;
2670 }
2671 }
2672
2673 info->pending_bh = 0;
2674
2675 memset(&info->icount, 0, sizeof(info->icount));
2676
2677 /* program hardware for current parameters */
2678 reset_port(info);
2679
2680 change_params(info);
2681
2682 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2683
2684 if (info->port.tty)
2685 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2686
2687 info->port.flags |= ASYNC_INITIALIZED;
2688
2689 return 0;
2690 }
2691
2692 /* Called by close() and hangup() to shutdown hardware
2693 */
2694 static void shutdown(SLMP_INFO * info)
2695 {
2696 unsigned long flags;
2697
2698 if (!(info->port.flags & ASYNC_INITIALIZED))
2699 return;
2700
2701 if (debug_level >= DEBUG_LEVEL_INFO)
2702 printk("%s(%d):%s synclinkmp_shutdown()\n",
2703 __FILE__,__LINE__, info->device_name );
2704
2705 /* clear status wait queue because status changes */
2706 /* can't happen after shutting down the hardware */
2707 wake_up_interruptible(&info->status_event_wait_q);
2708 wake_up_interruptible(&info->event_wait_q);
2709
2710 del_timer(&info->tx_timer);
2711 del_timer(&info->status_timer);
2712
2713 kfree(info->tx_buf);
2714 info->tx_buf = NULL;
2715
2716 spin_lock_irqsave(&info->lock,flags);
2717
2718 reset_port(info);
2719
2720 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2721 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2722 set_signals(info);
2723 }
2724
2725 spin_unlock_irqrestore(&info->lock,flags);
2726
2727 if (info->port.tty)
2728 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2729
2730 info->port.flags &= ~ASYNC_INITIALIZED;
2731 }
2732
2733 static void program_hw(SLMP_INFO *info)
2734 {
2735 unsigned long flags;
2736
2737 spin_lock_irqsave(&info->lock,flags);
2738
2739 rx_stop(info);
2740 tx_stop(info);
2741
2742 info->tx_count = info->tx_put = info->tx_get = 0;
2743
2744 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2745 hdlc_mode(info);
2746 else
2747 async_mode(info);
2748
2749 set_signals(info);
2750
2751 info->dcd_chkcount = 0;
2752 info->cts_chkcount = 0;
2753 info->ri_chkcount = 0;
2754 info->dsr_chkcount = 0;
2755
2756 info->ie1_value |= (CDCD|CCTS);
2757 write_reg(info, IE1, info->ie1_value);
2758
2759 get_signals(info);
2760
2761 if (info->netcount || (info->port.tty && info->port.tty->termios.c_cflag & CREAD) )
2762 rx_start(info);
2763
2764 spin_unlock_irqrestore(&info->lock,flags);
2765 }
2766
2767 /* Reconfigure adapter based on new parameters
2768 */
2769 static void change_params(SLMP_INFO *info)
2770 {
2771 unsigned cflag;
2772 int bits_per_char;
2773
2774 if (!info->port.tty)
2775 return;
2776
2777 if (debug_level >= DEBUG_LEVEL_INFO)
2778 printk("%s(%d):%s change_params()\n",
2779 __FILE__,__LINE__, info->device_name );
2780
2781 cflag = info->port.tty->termios.c_cflag;
2782
2783 /* if B0 rate (hangup) specified then negate DTR and RTS */
2784 /* otherwise assert DTR and RTS */
2785 if (cflag & CBAUD)
2786 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2787 else
2788 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2789
2790 /* byte size and parity */
2791
2792 switch (cflag & CSIZE) {
2793 case CS5: info->params.data_bits = 5; break;
2794 case CS6: info->params.data_bits = 6; break;
2795 case CS7: info->params.data_bits = 7; break;
2796 case CS8: info->params.data_bits = 8; break;
2797 /* Never happens, but GCC is too dumb to figure it out */
2798 default: info->params.data_bits = 7; break;
2799 }
2800
2801 if (cflag & CSTOPB)
2802 info->params.stop_bits = 2;
2803 else
2804 info->params.stop_bits = 1;
2805
2806 info->params.parity = ASYNC_PARITY_NONE;
2807 if (cflag & PARENB) {
2808 if (cflag & PARODD)
2809 info->params.parity = ASYNC_PARITY_ODD;
2810 else
2811 info->params.parity = ASYNC_PARITY_EVEN;
2812 #ifdef CMSPAR
2813 if (cflag & CMSPAR)
2814 info->params.parity = ASYNC_PARITY_SPACE;
2815 #endif
2816 }
2817
2818 /* calculate number of jiffies to transmit a full
2819 * FIFO (32 bytes) at specified data rate
2820 */
2821 bits_per_char = info->params.data_bits +
2822 info->params.stop_bits + 1;
2823
2824 /* if port data rate is set to 460800 or less then
2825 * allow tty settings to override, otherwise keep the
2826 * current data rate.
2827 */
2828 if (info->params.data_rate <= 460800) {
2829 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2830 }
2831
2832 if ( info->params.data_rate ) {
2833 info->timeout = (32*HZ*bits_per_char) /
2834 info->params.data_rate;
2835 }
2836 info->timeout += HZ/50; /* Add .02 seconds of slop */
2837
2838 if (cflag & CRTSCTS)
2839 info->port.flags |= ASYNC_CTS_FLOW;
2840 else
2841 info->port.flags &= ~ASYNC_CTS_FLOW;
2842
2843 if (cflag & CLOCAL)
2844 info->port.flags &= ~ASYNC_CHECK_CD;
2845 else
2846 info->port.flags |= ASYNC_CHECK_CD;
2847
2848 /* process tty input control flags */
2849
2850 info->read_status_mask2 = OVRN;
2851 if (I_INPCK(info->port.tty))
2852 info->read_status_mask2 |= PE | FRME;
2853 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2854 info->read_status_mask1 |= BRKD;
2855 if (I_IGNPAR(info->port.tty))
2856 info->ignore_status_mask2 |= PE | FRME;
2857 if (I_IGNBRK(info->port.tty)) {
2858 info->ignore_status_mask1 |= BRKD;
2859 /* If ignoring parity and break indicators, ignore
2860 * overruns too. (For real raw support).
2861 */
2862 if (I_IGNPAR(info->port.tty))
2863 info->ignore_status_mask2 |= OVRN;
2864 }
2865
2866 program_hw(info);
2867 }
2868
2869 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2870 {
2871 int err;
2872
2873 if (debug_level >= DEBUG_LEVEL_INFO)
2874 printk("%s(%d):%s get_params()\n",
2875 __FILE__,__LINE__, info->device_name);
2876
2877 if (!user_icount) {
2878 memset(&info->icount, 0, sizeof(info->icount));
2879 } else {
2880 mutex_lock(&info->port.mutex);
2881 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2882 mutex_unlock(&info->port.mutex);
2883 if (err)
2884 return -EFAULT;
2885 }
2886
2887 return 0;
2888 }
2889
2890 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2891 {
2892 int err;
2893 if (debug_level >= DEBUG_LEVEL_INFO)
2894 printk("%s(%d):%s get_params()\n",
2895 __FILE__,__LINE__, info->device_name);
2896
2897 mutex_lock(&info->port.mutex);
2898 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2899 mutex_unlock(&info->port.mutex);
2900 if (err) {
2901 if ( debug_level >= DEBUG_LEVEL_INFO )
2902 printk( "%s(%d):%s get_params() user buffer copy failed\n",
2903 __FILE__,__LINE__,info->device_name);
2904 return -EFAULT;
2905 }
2906
2907 return 0;
2908 }
2909
2910 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2911 {
2912 unsigned long flags;
2913 MGSL_PARAMS tmp_params;
2914 int err;
2915
2916 if (debug_level >= DEBUG_LEVEL_INFO)
2917 printk("%s(%d):%s set_params\n",
2918 __FILE__,__LINE__,info->device_name );
2919 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2920 if (err) {
2921 if ( debug_level >= DEBUG_LEVEL_INFO )
2922 printk( "%s(%d):%s set_params() user buffer copy failed\n",
2923 __FILE__,__LINE__,info->device_name);
2924 return -EFAULT;
2925 }
2926
2927 mutex_lock(&info->port.mutex);
2928 spin_lock_irqsave(&info->lock,flags);
2929 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2930 spin_unlock_irqrestore(&info->lock,flags);
2931
2932 change_params(info);
2933 mutex_unlock(&info->port.mutex);
2934
2935 return 0;
2936 }
2937
2938 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2939 {
2940 int err;
2941
2942 if (debug_level >= DEBUG_LEVEL_INFO)
2943 printk("%s(%d):%s get_txidle()=%d\n",
2944 __FILE__,__LINE__, info->device_name, info->idle_mode);
2945
2946 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2947 if (err) {
2948 if ( debug_level >= DEBUG_LEVEL_INFO )
2949 printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
2950 __FILE__,__LINE__,info->device_name);
2951 return -EFAULT;
2952 }
2953
2954 return 0;
2955 }
2956
2957 static int set_txidle(SLMP_INFO * info, int idle_mode)
2958 {
2959 unsigned long flags;
2960
2961 if (debug_level >= DEBUG_LEVEL_INFO)
2962 printk("%s(%d):%s set_txidle(%d)\n",
2963 __FILE__,__LINE__,info->device_name, idle_mode );
2964
2965 spin_lock_irqsave(&info->lock,flags);
2966 info->idle_mode = idle_mode;
2967 tx_set_idle( info );
2968 spin_unlock_irqrestore(&info->lock,flags);
2969 return 0;
2970 }
2971
2972 static int tx_enable(SLMP_INFO * info, int enable)
2973 {
2974 unsigned long flags;
2975
2976 if (debug_level >= DEBUG_LEVEL_INFO)
2977 printk("%s(%d):%s tx_enable(%d)\n",
2978 __FILE__,__LINE__,info->device_name, enable);
2979
2980 spin_lock_irqsave(&info->lock,flags);
2981 if ( enable ) {
2982 if ( !info->tx_enabled ) {
2983 tx_start(info);
2984 }
2985 } else {
2986 if ( info->tx_enabled )
2987 tx_stop(info);
2988 }
2989 spin_unlock_irqrestore(&info->lock,flags);
2990 return 0;
2991 }
2992
2993 /* abort send HDLC frame
2994 */
2995 static int tx_abort(SLMP_INFO * info)
2996 {
2997 unsigned long flags;
2998
2999 if (debug_level >= DEBUG_LEVEL_INFO)
3000 printk("%s(%d):%s tx_abort()\n",
3001 __FILE__,__LINE__,info->device_name);
3002
3003 spin_lock_irqsave(&info->lock,flags);
3004 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3005 info->ie1_value &= ~UDRN;
3006 info->ie1_value |= IDLE;
3007 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
3008 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
3009
3010 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
3011 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3012
3013 write_reg(info, CMD, TXABORT);
3014 }
3015 spin_unlock_irqrestore(&info->lock,flags);
3016 return 0;
3017 }
3018
3019 static int rx_enable(SLMP_INFO * info, int enable)
3020 {
3021 unsigned long flags;
3022
3023 if (debug_level >= DEBUG_LEVEL_INFO)
3024 printk("%s(%d):%s rx_enable(%d)\n",
3025 __FILE__,__LINE__,info->device_name,enable);
3026
3027 spin_lock_irqsave(&info->lock,flags);
3028 if ( enable ) {
3029 if ( !info->rx_enabled )
3030 rx_start(info);
3031 } else {
3032 if ( info->rx_enabled )
3033 rx_stop(info);
3034 }
3035 spin_unlock_irqrestore(&info->lock,flags);
3036 return 0;
3037 }
3038
3039 /* wait for specified event to occur
3040 */
3041 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3042 {
3043 unsigned long flags;
3044 int s;
3045 int rc=0;
3046 struct mgsl_icount cprev, cnow;
3047 int events;
3048 int mask;
3049 struct _input_signal_events oldsigs, newsigs;
3050 DECLARE_WAITQUEUE(wait, current);
3051
3052 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3053 if (rc) {
3054 return -EFAULT;
3055 }
3056
3057 if (debug_level >= DEBUG_LEVEL_INFO)
3058 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3059 __FILE__,__LINE__,info->device_name,mask);
3060
3061 spin_lock_irqsave(&info->lock,flags);
3062
3063 /* return immediately if state matches requested events */
3064 get_signals(info);
3065 s = info->serial_signals;
3066
3067 events = mask &
3068 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3069 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3070 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3071 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3072 if (events) {
3073 spin_unlock_irqrestore(&info->lock,flags);
3074 goto exit;
3075 }
3076
3077 /* save current irq counts */
3078 cprev = info->icount;
3079 oldsigs = info->input_signal_events;
3080
3081 /* enable hunt and idle irqs if needed */
3082 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3083 unsigned char oldval = info->ie1_value;
3084 unsigned char newval = oldval +
3085 (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3086 (mask & MgslEvent_IdleReceived ? IDLD:0);
3087 if ( oldval != newval ) {
3088 info->ie1_value = newval;
3089 write_reg(info, IE1, info->ie1_value);
3090 }
3091 }
3092
3093 set_current_state(TASK_INTERRUPTIBLE);
3094 add_wait_queue(&info->event_wait_q, &wait);
3095
3096 spin_unlock_irqrestore(&info->lock,flags);
3097
3098 for(;;) {
3099 schedule();
3100 if (signal_pending(current)) {
3101 rc = -ERESTARTSYS;
3102 break;
3103 }
3104
3105 /* get current irq counts */
3106 spin_lock_irqsave(&info->lock,flags);
3107 cnow = info->icount;
3108 newsigs = info->input_signal_events;
3109 set_current_state(TASK_INTERRUPTIBLE);
3110 spin_unlock_irqrestore(&info->lock,flags);
3111
3112 /* if no change, wait aborted for some reason */
3113 if (newsigs.dsr_up == oldsigs.dsr_up &&
3114 newsigs.dsr_down == oldsigs.dsr_down &&
3115 newsigs.dcd_up == oldsigs.dcd_up &&
3116 newsigs.dcd_down == oldsigs.dcd_down &&
3117 newsigs.cts_up == oldsigs.cts_up &&
3118 newsigs.cts_down == oldsigs.cts_down &&
3119 newsigs.ri_up == oldsigs.ri_up &&
3120 newsigs.ri_down == oldsigs.ri_down &&
3121 cnow.exithunt == cprev.exithunt &&
3122 cnow.rxidle == cprev.rxidle) {
3123 rc = -EIO;
3124 break;
3125 }
3126
3127 events = mask &
3128 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
3129 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3130 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
3131 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3132 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
3133 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3134 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
3135 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
3136 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
3137 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
3138 if (events)
3139 break;
3140
3141 cprev = cnow;
3142 oldsigs = newsigs;
3143 }
3144
3145 remove_wait_queue(&info->event_wait_q, &wait);
3146 set_current_state(TASK_RUNNING);
3147
3148
3149 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3150 spin_lock_irqsave(&info->lock,flags);
3151 if (!waitqueue_active(&info->event_wait_q)) {
3152 /* disable enable exit hunt mode/idle rcvd IRQs */
3153 info->ie1_value &= ~(FLGD|IDLD);
3154 write_reg(info, IE1, info->ie1_value);
3155 }
3156 spin_unlock_irqrestore(&info->lock,flags);
3157 }
3158 exit:
3159 if ( rc == 0 )
3160 PUT_USER(rc, events, mask_ptr);
3161
3162 return rc;
3163 }
3164
3165 static int modem_input_wait(SLMP_INFO *info,int arg)
3166 {
3167 unsigned long flags;
3168 int rc;
3169 struct mgsl_icount cprev, cnow;
3170 DECLARE_WAITQUEUE(wait, current);
3171
3172 /* save current irq counts */
3173 spin_lock_irqsave(&info->lock,flags);
3174 cprev = info->icount;
3175 add_wait_queue(&info->status_event_wait_q, &wait);
3176 set_current_state(TASK_INTERRUPTIBLE);
3177 spin_unlock_irqrestore(&info->lock,flags);
3178
3179 for(;;) {
3180 schedule();
3181 if (signal_pending(current)) {
3182 rc = -ERESTARTSYS;
3183 break;
3184 }
3185
3186 /* get new irq counts */
3187 spin_lock_irqsave(&info->lock,flags);
3188 cnow = info->icount;
3189 set_current_state(TASK_INTERRUPTIBLE);
3190 spin_unlock_irqrestore(&info->lock,flags);
3191
3192 /* if no change, wait aborted for some reason */
3193 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3194 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3195 rc = -EIO;
3196 break;
3197 }
3198
3199 /* check for change in caller specified modem input */
3200 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3201 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3202 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3203 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3204 rc = 0;
3205 break;
3206 }
3207
3208 cprev = cnow;
3209 }
3210 remove_wait_queue(&info->status_event_wait_q, &wait);
3211 set_current_state(TASK_RUNNING);
3212 return rc;
3213 }
3214
3215 /* return the state of the serial control and status signals
3216 */
3217 static int tiocmget(struct tty_struct *tty)
3218 {
3219 SLMP_INFO *info = tty->driver_data;
3220 unsigned int result;
3221 unsigned long flags;
3222
3223 spin_lock_irqsave(&info->lock,flags);
3224 get_signals(info);
3225 spin_unlock_irqrestore(&info->lock,flags);
3226
3227 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3228 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3229 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3230 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3231 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3232 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3233
3234 if (debug_level >= DEBUG_LEVEL_INFO)
3235 printk("%s(%d):%s tiocmget() value=%08X\n",
3236 __FILE__,__LINE__, info->device_name, result );
3237 return result;
3238 }
3239
3240 /* set modem control signals (DTR/RTS)
3241 */
3242 static int tiocmset(struct tty_struct *tty,
3243 unsigned int set, unsigned int clear)
3244 {
3245 SLMP_INFO *info = tty->driver_data;
3246 unsigned long flags;
3247
3248 if (debug_level >= DEBUG_LEVEL_INFO)
3249 printk("%s(%d):%s tiocmset(%x,%x)\n",
3250 __FILE__,__LINE__,info->device_name, set, clear);
3251
3252 if (set & TIOCM_RTS)
3253 info->serial_signals |= SerialSignal_RTS;
3254 if (set & TIOCM_DTR)
3255 info->serial_signals |= SerialSignal_DTR;
3256 if (clear & TIOCM_RTS)
3257 info->serial_signals &= ~SerialSignal_RTS;
3258 if (clear & TIOCM_DTR)
3259 info->serial_signals &= ~SerialSignal_DTR;
3260
3261 spin_lock_irqsave(&info->lock,flags);
3262 set_signals(info);
3263 spin_unlock_irqrestore(&info->lock,flags);
3264
3265 return 0;
3266 }
3267
3268 static int carrier_raised(struct tty_port *port)
3269 {
3270 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3271 unsigned long flags;
3272
3273 spin_lock_irqsave(&info->lock,flags);
3274 get_signals(info);
3275 spin_unlock_irqrestore(&info->lock,flags);
3276
3277 return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
3278 }
3279
3280 static void dtr_rts(struct tty_port *port, int on)
3281 {
3282 SLMP_INFO *info = container_of(port, SLMP_INFO, port);
3283 unsigned long flags;
3284
3285 spin_lock_irqsave(&info->lock,flags);
3286 if (on)
3287 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3288 else
3289 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3290 set_signals(info);
3291 spin_unlock_irqrestore(&info->lock,flags);
3292 }
3293
3294 /* Block the current process until the specified port is ready to open.
3295 */
3296 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3297 SLMP_INFO *info)
3298 {
3299 DECLARE_WAITQUEUE(wait, current);
3300 int retval;
3301 bool do_clocal = false;
3302 bool extra_count = false;
3303 unsigned long flags;
3304 int cd;
3305 struct tty_port *port = &info->port;
3306
3307 if (debug_level >= DEBUG_LEVEL_INFO)
3308 printk("%s(%d):%s block_til_ready()\n",
3309 __FILE__,__LINE__, tty->driver->name );
3310
3311 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3312 /* nonblock mode is set or port is not enabled */
3313 /* just verify that callout device is not active */
3314 port->flags |= ASYNC_NORMAL_ACTIVE;
3315 return 0;
3316 }
3317
3318 if (tty->termios.c_cflag & CLOCAL)
3319 do_clocal = true;
3320
3321 /* Wait for carrier detect and the line to become
3322 * free (i.e., not in use by the callout). While we are in
3323 * this loop, port->count is dropped by one, so that
3324 * close() knows when to free things. We restore it upon
3325 * exit, either normal or abnormal.
3326 */
3327
3328 retval = 0;
3329 add_wait_queue(&port->open_wait, &wait);
3330
3331 if (debug_level >= DEBUG_LEVEL_INFO)
3332 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3333 __FILE__,__LINE__, tty->driver->name, port->count );
3334
3335 spin_lock_irqsave(&info->lock, flags);
3336 if (!tty_hung_up_p(filp)) {
3337 extra_count = true;
3338 port->count--;
3339 }
3340 spin_unlock_irqrestore(&info->lock, flags);
3341 port->blocked_open++;
3342
3343 while (1) {
3344 if (tty->termios.c_cflag & CBAUD)
3345 tty_port_raise_dtr_rts(port);
3346
3347 set_current_state(TASK_INTERRUPTIBLE);
3348
3349 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3350 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3351 -EAGAIN : -ERESTARTSYS;
3352 break;
3353 }
3354
3355 cd = tty_port_carrier_raised(port);
3356
3357 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
3358 break;
3359
3360 if (signal_pending(current)) {
3361 retval = -ERESTARTSYS;
3362 break;
3363 }
3364
3365 if (debug_level >= DEBUG_LEVEL_INFO)
3366 printk("%s(%d):%s block_til_ready() count=%d\n",
3367 __FILE__,__LINE__, tty->driver->name, port->count );
3368
3369 tty_unlock(tty);
3370 schedule();
3371 tty_lock(tty);
3372 }
3373
3374 set_current_state(TASK_RUNNING);
3375 remove_wait_queue(&port->open_wait, &wait);
3376
3377 if (extra_count)
3378 port->count++;
3379 port->blocked_open--;
3380
3381 if (debug_level >= DEBUG_LEVEL_INFO)
3382 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3383 __FILE__,__LINE__, tty->driver->name, port->count );
3384
3385 if (!retval)
3386 port->flags |= ASYNC_NORMAL_ACTIVE;
3387
3388 return retval;
3389 }
3390
3391 static int alloc_dma_bufs(SLMP_INFO *info)
3392 {
3393 unsigned short BuffersPerFrame;
3394 unsigned short BufferCount;
3395
3396 // Force allocation to start at 64K boundary for each port.
3397 // This is necessary because *all* buffer descriptors for a port
3398 // *must* be in the same 64K block. All descriptors on a port
3399 // share a common 'base' address (upper 8 bits of 24 bits) programmed
3400 // into the CBP register.
3401 info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3402
3403 /* Calculate the number of DMA buffers necessary to hold the */
3404 /* largest allowable frame size. Note: If the max frame size is */
3405 /* not an even multiple of the DMA buffer size then we need to */
3406 /* round the buffer count per frame up one. */
3407
3408 BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3409 if ( info->max_frame_size % SCABUFSIZE )
3410 BuffersPerFrame++;
3411
3412 /* calculate total number of data buffers (SCABUFSIZE) possible
3413 * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3414 * for the descriptor list (BUFFERLISTSIZE).
3415 */
3416 BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3417
3418 /* limit number of buffers to maximum amount of descriptors */
3419 if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3420 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3421
3422 /* use enough buffers to transmit one max size frame */
3423 info->tx_buf_count = BuffersPerFrame + 1;
3424
3425 /* never use more than half the available buffers for transmit */
3426 if (info->tx_buf_count > (BufferCount/2))
3427 info->tx_buf_count = BufferCount/2;
3428
3429 if (info->tx_buf_count > SCAMAXDESC)
3430 info->tx_buf_count = SCAMAXDESC;
3431
3432 /* use remaining buffers for receive */
3433 info->rx_buf_count = BufferCount - info->tx_buf_count;
3434
3435 if (info->rx_buf_count > SCAMAXDESC)
3436 info->rx_buf_count = SCAMAXDESC;
3437
3438 if ( debug_level >= DEBUG_LEVEL_INFO )
3439 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3440 __FILE__,__LINE__, info->device_name,
3441 info->tx_buf_count,info->rx_buf_count);
3442
3443 if ( alloc_buf_list( info ) < 0 ||
3444 alloc_frame_bufs(info,
3445 info->rx_buf_list,
3446 info->rx_buf_list_ex,
3447 info->rx_buf_count) < 0 ||
3448 alloc_frame_bufs(info,
3449 info->tx_buf_list,
3450 info->tx_buf_list_ex,
3451 info->tx_buf_count) < 0 ||
3452 alloc_tmp_rx_buf(info) < 0 ) {
3453 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3454 __FILE__,__LINE__, info->device_name);
3455 return -ENOMEM;
3456 }
3457
3458 rx_reset_buffers( info );
3459
3460 return 0;
3461 }
3462
3463 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3464 */
3465 static int alloc_buf_list(SLMP_INFO *info)
3466 {
3467 unsigned int i;
3468
3469 /* build list in adapter shared memory */
3470 info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3471 info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3472 info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3473
3474 memset(info->buffer_list, 0, BUFFERLISTSIZE);
3475
3476 /* Save virtual address pointers to the receive and */
3477 /* transmit buffer lists. (Receive 1st). These pointers will */
3478 /* be used by the processor to access the lists. */
3479 info->rx_buf_list = (SCADESC *)info->buffer_list;
3480
3481 info->tx_buf_list = (SCADESC *)info->buffer_list;
3482 info->tx_buf_list += info->rx_buf_count;
3483
3484 /* Build links for circular buffer entry lists (tx and rx)
3485 *
3486 * Note: links are physical addresses read by the SCA device
3487 * to determine the next buffer entry to use.
3488 */
3489
3490 for ( i = 0; i < info->rx_buf_count; i++ ) {
3491 /* calculate and store physical address of this buffer entry */
3492 info->rx_buf_list_ex[i].phys_entry =
3493 info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3494
3495 /* calculate and store physical address of */
3496 /* next entry in cirular list of entries */
3497 info->rx_buf_list[i].next = info->buffer_list_phys;
3498 if ( i < info->rx_buf_count - 1 )
3499 info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3500
3501 info->rx_buf_list[i].length = SCABUFSIZE;
3502 }
3503
3504 for ( i = 0; i < info->tx_buf_count; i++ ) {
3505 /* calculate and store physical address of this buffer entry */
3506 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3507 ((info->rx_buf_count + i) * sizeof(SCADESC));
3508
3509 /* calculate and store physical address of */
3510 /* next entry in cirular list of entries */
3511
3512 info->tx_buf_list[i].next = info->buffer_list_phys +
3513 info->rx_buf_count * sizeof(SCADESC);
3514
3515 if ( i < info->tx_buf_count - 1 )
3516 info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3517 }
3518
3519 return 0;
3520 }
3521
3522 /* Allocate the frame DMA buffers used by the specified buffer list.
3523 */
3524 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3525 {
3526 int i;
3527 unsigned long phys_addr;
3528
3529 for ( i = 0; i < count; i++ ) {
3530 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3531 phys_addr = info->port_array[0]->last_mem_alloc;
3532 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3533
3534 buf_list[i].buf_ptr = (unsigned short)phys_addr;
3535 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3536 }
3537
3538 return 0;
3539 }
3540
3541 static void free_dma_bufs(SLMP_INFO *info)
3542 {
3543 info->buffer_list = NULL;
3544 info->rx_buf_list = NULL;
3545 info->tx_buf_list = NULL;
3546 }
3547
3548 /* allocate buffer large enough to hold max_frame_size.
3549 * This buffer is used to pass an assembled frame to the line discipline.
3550 */
3551 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3552 {
3553 info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3554 if (info->tmp_rx_buf == NULL)
3555 return -ENOMEM;
3556 return 0;
3557 }
3558
3559 static void free_tmp_rx_buf(SLMP_INFO *info)
3560 {
3561 kfree(info->tmp_rx_buf);
3562 info->tmp_rx_buf = NULL;
3563 }
3564
3565 static int claim_resources(SLMP_INFO *info)
3566 {
3567 if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3568 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3569 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3570 info->init_error = DiagStatus_AddressConflict;
3571 goto errout;
3572 }
3573 else
3574 info->shared_mem_requested = true;
3575
3576 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3577 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3578 __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3579 info->init_error = DiagStatus_AddressConflict;
3580 goto errout;
3581 }
3582 else
3583 info->lcr_mem_requested = true;
3584
3585 if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3586 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3587 __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3588 info->init_error = DiagStatus_AddressConflict;
3589 goto errout;
3590 }
3591 else
3592 info->sca_base_requested = true;
3593
3594 if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3595 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3596 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3597 info->init_error = DiagStatus_AddressConflict;
3598 goto errout;
3599 }
3600 else
3601 info->sca_statctrl_requested = true;
3602
3603 info->memory_base = ioremap_nocache(info->phys_memory_base,
3604 SCA_MEM_SIZE);
3605 if (!info->memory_base) {
3606 printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
3607 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3608 info->init_error = DiagStatus_CantAssignPciResources;
3609 goto errout;
3610 }
3611
3612 info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3613 if (!info->lcr_base) {
3614 printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
3615 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3616 info->init_error = DiagStatus_CantAssignPciResources;
3617 goto errout;
3618 }
3619 info->lcr_base += info->lcr_offset;
3620
3621 info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3622 if (!info->sca_base) {
3623 printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
3624 __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3625 info->init_error = DiagStatus_CantAssignPciResources;
3626 goto errout;
3627 }
3628 info->sca_base += info->sca_offset;
3629
3630 info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3631 PAGE_SIZE);
3632 if (!info->statctrl_base) {
3633 printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
3634 __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3635 info->init_error = DiagStatus_CantAssignPciResources;
3636 goto errout;
3637 }
3638 info->statctrl_base += info->statctrl_offset;
3639
3640 if ( !memory_test(info) ) {
3641 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3642 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3643 info->init_error = DiagStatus_MemoryError;
3644 goto errout;
3645 }
3646
3647 return 0;
3648
3649 errout:
3650 release_resources( info );
3651 return -ENODEV;
3652 }
3653
3654 static void release_resources(SLMP_INFO *info)
3655 {
3656 if ( debug_level >= DEBUG_LEVEL_INFO )
3657 printk( "%s(%d):%s release_resources() entry\n",
3658 __FILE__,__LINE__,info->device_name );
3659
3660 if ( info->irq_requested ) {
3661 free_irq(info->irq_level, info);
3662 info->irq_requested = false;
3663 }
3664
3665 if ( info->shared_mem_requested ) {
3666 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3667 info->shared_mem_requested = false;
3668 }
3669 if ( info->lcr_mem_requested ) {
3670 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3671 info->lcr_mem_requested = false;
3672 }
3673 if ( info->sca_base_requested ) {
3674 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3675 info->sca_base_requested = false;
3676 }
3677 if ( info->sca_statctrl_requested ) {
3678 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3679 info->sca_statctrl_requested = false;
3680 }
3681
3682 if (info->memory_base){
3683 iounmap(info->memory_base);
3684 info->memory_base = NULL;
3685 }
3686
3687 if (info->sca_base) {
3688 iounmap(info->sca_base - info->sca_offset);
3689 info->sca_base=NULL;
3690 }
3691
3692 if (info->statctrl_base) {
3693 iounmap(info->statctrl_base - info->statctrl_offset);
3694 info->statctrl_base=NULL;
3695 }
3696
3697 if (info->lcr_base){
3698 iounmap(info->lcr_base - info->lcr_offset);
3699 info->lcr_base = NULL;
3700 }
3701
3702 if ( debug_level >= DEBUG_LEVEL_INFO )
3703 printk( "%s(%d):%s release_resources() exit\n",
3704 __FILE__,__LINE__,info->device_name );
3705 }
3706
3707 /* Add the specified device instance data structure to the
3708 * global linked list of devices and increment the device count.
3709 */
3710 static void add_device(SLMP_INFO *info)
3711 {
3712 info->next_device = NULL;
3713 info->line = synclinkmp_device_count;
3714 sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3715
3716 if (info->line < MAX_DEVICES) {
3717 if (maxframe[info->line])
3718 info->max_frame_size = maxframe[info->line];
3719 }
3720
3721 synclinkmp_device_count++;
3722
3723 if ( !synclinkmp_device_list )
3724 synclinkmp_device_list = info;
3725 else {
3726 SLMP_INFO *current_dev = synclinkmp_device_list;
3727 while( current_dev->next_device )
3728 current_dev = current_dev->next_device;
3729 current_dev->next_device = info;
3730 }
3731
3732 if ( info->max_frame_size < 4096 )
3733 info->max_frame_size = 4096;
3734 else if ( info->max_frame_size > 65535 )
3735 info->max_frame_size = 65535;
3736
3737 printk( "SyncLink MultiPort %s: "
3738 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3739 info->device_name,
3740 info->phys_sca_base,
3741 info->phys_memory_base,
3742 info->phys_statctrl_base,
3743 info->phys_lcr_base,
3744 info->irq_level,
3745 info->max_frame_size );
3746
3747 #if SYNCLINK_GENERIC_HDLC
3748 hdlcdev_init(info);
3749 #endif
3750 }
3751
3752 static const struct tty_port_operations port_ops = {
3753 .carrier_raised = carrier_raised,
3754 .dtr_rts = dtr_rts,
3755 };
3756
3757 /* Allocate and initialize a device instance structure
3758 *
3759 * Return Value: pointer to SLMP_INFO if success, otherwise NULL
3760 */
3761 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3762 {
3763 SLMP_INFO *info;
3764
3765 info = kzalloc(sizeof(SLMP_INFO),
3766 GFP_KERNEL);
3767
3768 if (!info) {
3769 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3770 __FILE__,__LINE__, adapter_num, port_num);
3771 } else {
3772 tty_port_init(&info->port);
3773 info->port.ops = &port_ops;
3774 info->magic = MGSL_MAGIC;
3775 INIT_WORK(&info->task, bh_handler);
3776 info->max_frame_size = 4096;
3777 info->port.close_delay = 5*HZ/10;
3778 info->port.closing_wait = 30*HZ;
3779 init_waitqueue_head(&info->status_event_wait_q);
3780 init_waitqueue_head(&info->event_wait_q);
3781 spin_lock_init(&info->netlock);
3782 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3783 info->idle_mode = HDLC_TXIDLE_FLAGS;
3784 info->adapter_num = adapter_num;
3785 info->port_num = port_num;
3786
3787 /* Copy configuration info to device instance data */
3788 info->irq_level = pdev->irq;
3789 info->phys_lcr_base = pci_resource_start(pdev,0);
3790 info->phys_sca_base = pci_resource_start(pdev,2);
3791 info->phys_memory_base = pci_resource_start(pdev,3);
3792 info->phys_statctrl_base = pci_resource_start(pdev,4);
3793
3794 /* Because veremap only works on page boundaries we must map
3795 * a larger area than is actually implemented for the LCR
3796 * memory range. We map a full page starting at the page boundary.
3797 */
3798 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
3799 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3800
3801 info->sca_offset = info->phys_sca_base & (PAGE_SIZE-1);
3802 info->phys_sca_base &= ~(PAGE_SIZE-1);
3803
3804 info->statctrl_offset = info->phys_statctrl_base & (PAGE_SIZE-1);
3805 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3806
3807 info->bus_type = MGSL_BUS_TYPE_PCI;
3808 info->irq_flags = IRQF_SHARED;
3809
3810 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3811 setup_timer(&info->status_timer, status_timeout,
3812 (unsigned long)info);
3813
3814 /* Store the PCI9050 misc control register value because a flaw
3815 * in the PCI9050 prevents LCR registers from being read if
3816 * BIOS assigns an LCR base address with bit 7 set.
3817 *
3818 * Only the misc control register is accessed for which only
3819 * write access is needed, so set an initial value and change
3820 * bits to the device instance data as we write the value
3821 * to the actual misc control register.
3822 */
3823 info->misc_ctrl_value = 0x087e4546;
3824
3825 /* initial port state is unknown - if startup errors
3826 * occur, init_error will be set to indicate the
3827 * problem. Once the port is fully initialized,
3828 * this value will be set to 0 to indicate the
3829 * port is available.
3830 */
3831 info->init_error = -1;
3832 }
3833
3834 return info;
3835 }
3836
3837 static void device_init(int adapter_num, struct pci_dev *pdev)
3838 {
3839 SLMP_INFO *port_array[SCA_MAX_PORTS];
3840 int port;
3841
3842 /* allocate device instances for up to SCA_MAX_PORTS devices */
3843 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3844 port_array[port] = alloc_dev(adapter_num,port,pdev);
3845 if( port_array[port] == NULL ) {
3846 for ( --port; port >= 0; --port )
3847 kfree(port_array[port]);
3848 return;
3849 }
3850 }
3851
3852 /* give copy of port_array to all ports and add to device list */
3853 for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3854 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3855 add_device( port_array[port] );
3856 spin_lock_init(&port_array[port]->lock);
3857 }
3858
3859 /* Allocate and claim adapter resources */
3860 if ( !claim_resources(port_array[0]) ) {
3861
3862 alloc_dma_bufs(port_array[0]);
3863
3864 /* copy resource information from first port to others */
3865 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3866 port_array[port]->lock = port_array[0]->lock;
3867 port_array[port]->irq_level = port_array[0]->irq_level;
3868 port_array[port]->memory_base = port_array[0]->memory_base;
3869 port_array[port]->sca_base = port_array[0]->sca_base;
3870 port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3871 port_array[port]->lcr_base = port_array[0]->lcr_base;
3872 alloc_dma_bufs(port_array[port]);
3873 }
3874
3875 if ( request_irq(port_array[0]->irq_level,
3876 synclinkmp_interrupt,
3877 port_array[0]->irq_flags,
3878 port_array[0]->device_name,
3879 port_array[0]) < 0 ) {
3880 printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
3881 __FILE__,__LINE__,
3882 port_array[0]->device_name,
3883 port_array[0]->irq_level );
3884 }
3885 else {
3886 port_array[0]->irq_requested = true;
3887 adapter_test(port_array[0]);
3888 }
3889 }
3890 }
3891
3892 static const struct tty_operations ops = {
3893 .install = install,
3894 .open = open,
3895 .close = close,
3896 .write = write,
3897 .put_char = put_char,
3898 .flush_chars = flush_chars,
3899 .write_room = write_room,
3900 .chars_in_buffer = chars_in_buffer,
3901 .flush_buffer = flush_buffer,
3902 .ioctl = ioctl,
3903 .throttle = throttle,
3904 .unthrottle = unthrottle,
3905 .send_xchar = send_xchar,
3906 .break_ctl = set_break,
3907 .wait_until_sent = wait_until_sent,
3908 .set_termios = set_termios,
3909 .stop = tx_hold,
3910 .start = tx_release,
3911 .hangup = hangup,
3912 .tiocmget = tiocmget,
3913 .tiocmset = tiocmset,
3914 .get_icount = get_icount,
3915 .proc_fops = &synclinkmp_proc_fops,
3916 };
3917
3918
3919 static void synclinkmp_cleanup(void)
3920 {
3921 int rc;
3922 SLMP_INFO *info;
3923 SLMP_INFO *tmp;
3924
3925 printk("Unloading %s %s\n", driver_name, driver_version);
3926
3927 if (serial_driver) {
3928 if ((rc = tty_unregister_driver(serial_driver)))
3929 printk("%s(%d) failed to unregister tty driver err=%d\n",
3930 __FILE__,__LINE__,rc);
3931 put_tty_driver(serial_driver);
3932 }
3933
3934 /* reset devices */
3935 info = synclinkmp_device_list;
3936 while(info) {
3937 reset_port(info);
3938 info = info->next_device;
3939 }
3940
3941 /* release devices */
3942 info = synclinkmp_device_list;
3943 while(info) {
3944 #if SYNCLINK_GENERIC_HDLC
3945 hdlcdev_exit(info);
3946 #endif
3947 free_dma_bufs(info);
3948 free_tmp_rx_buf(info);
3949 if ( info->port_num == 0 ) {
3950 if (info->sca_base)
3951 write_reg(info, LPR, 1); /* set low power mode */
3952 release_resources(info);
3953 }
3954 tmp = info;
3955 info = info->next_device;
3956 kfree(tmp);
3957 }
3958
3959 pci_unregister_driver(&synclinkmp_pci_driver);
3960 }
3961
3962 /* Driver initialization entry point.
3963 */
3964
3965 static int __init synclinkmp_init(void)
3966 {
3967 int rc;
3968
3969 if (break_on_load) {
3970 synclinkmp_get_text_ptr();
3971 BREAKPOINT();
3972 }
3973
3974 printk("%s %s\n", driver_name, driver_version);
3975
3976 if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3977 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3978 return rc;
3979 }
3980
3981 serial_driver = alloc_tty_driver(128);
3982 if (!serial_driver) {
3983 rc = -ENOMEM;
3984 goto error;
3985 }
3986
3987 /* Initialize the tty_driver structure */
3988
3989 serial_driver->driver_name = "synclinkmp";
3990 serial_driver->name = "ttySLM";
3991 serial_driver->major = ttymajor;
3992 serial_driver->minor_start = 64;
3993 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3994 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3995 serial_driver->init_termios = tty_std_termios;
3996 serial_driver->init_termios.c_cflag =
3997 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3998 serial_driver->init_termios.c_ispeed = 9600;
3999 serial_driver->init_termios.c_ospeed = 9600;
4000 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4001 tty_set_operations(serial_driver, &ops);
4002 if ((rc = tty_register_driver(serial_driver)) < 0) {
4003 printk("%s(%d):Couldn't register serial driver\n",
4004 __FILE__,__LINE__);
4005 put_tty_driver(serial_driver);
4006 serial_driver = NULL;
4007 goto error;
4008 }
4009
4010 printk("%s %s, tty major#%d\n",
4011 driver_name, driver_version,
4012 serial_driver->major);
4013
4014 return 0;
4015
4016 error:
4017 synclinkmp_cleanup();
4018 return rc;
4019 }
4020
4021 static void __exit synclinkmp_exit(void)
4022 {
4023 synclinkmp_cleanup();
4024 }
4025
4026 module_init(synclinkmp_init);
4027 module_exit(synclinkmp_exit);
4028
4029 /* Set the port for internal loopback mode.
4030 * The TxCLK and RxCLK signals are generated from the BRG and
4031 * the TxD is looped back to the RxD internally.
4032 */
4033 static void enable_loopback(SLMP_INFO *info, int enable)
4034 {
4035 if (enable) {
4036 /* MD2 (Mode Register 2)
4037 * 01..00 CNCT<1..0> Channel Connection 11=Local Loopback
4038 */
4039 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4040
4041 /* degate external TxC clock source */
4042 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4043 write_control_reg(info);
4044
4045 /* RXS/TXS (Rx/Tx clock source)
4046 * 07 Reserved, must be 0
4047 * 06..04 Clock Source, 100=BRG
4048 * 03..00 Clock Divisor, 0000=1
4049 */
4050 write_reg(info, RXS, 0x40);
4051 write_reg(info, TXS, 0x40);
4052
4053 } else {
4054 /* MD2 (Mode Register 2)
4055 * 01..00 CNCT<1..0> Channel connection, 0=normal
4056 */
4057 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4058
4059 /* RXS/TXS (Rx/Tx clock source)
4060 * 07 Reserved, must be 0
4061 * 06..04 Clock Source, 000=RxC/TxC Pin
4062 * 03..00 Clock Divisor, 0000=1
4063 */
4064 write_reg(info, RXS, 0x00);
4065 write_reg(info, TXS, 0x00);
4066 }
4067
4068 /* set LinkSpeed if available, otherwise default to 2Mbps */
4069 if (info->params.clock_speed)
4070 set_rate(info, info->params.clock_speed);
4071 else
4072 set_rate(info, 3686400);
4073 }
4074
4075 /* Set the baud rate register to the desired speed
4076 *
4077 * data_rate data rate of clock in bits per second
4078 * A data rate of 0 disables the AUX clock.
4079 */
4080 static void set_rate( SLMP_INFO *info, u32 data_rate )
4081 {
4082 u32 TMCValue;
4083 unsigned char BRValue;
4084 u32 Divisor=0;
4085
4086 /* fBRG = fCLK/(TMC * 2^BR)
4087 */
4088 if (data_rate != 0) {
4089 Divisor = 14745600/data_rate;
4090 if (!Divisor)
4091 Divisor = 1;
4092
4093 TMCValue = Divisor;
4094
4095 BRValue = 0;
4096 if (TMCValue != 1 && TMCValue != 2) {
4097 /* BRValue of 0 provides 50/50 duty cycle *only* when
4098 * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4099 * 50/50 duty cycle.
4100 */
4101 BRValue = 1;
4102 TMCValue >>= 1;
4103 }
4104
4105 /* while TMCValue is too big for TMC register, divide
4106 * by 2 and increment BR exponent.
4107 */
4108 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4109 TMCValue >>= 1;
4110
4111 write_reg(info, TXS,
4112 (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4113 write_reg(info, RXS,
4114 (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4115 write_reg(info, TMC, (unsigned char)TMCValue);
4116 }
4117 else {
4118 write_reg(info, TXS,0);
4119 write_reg(info, RXS,0);
4120 write_reg(info, TMC, 0);
4121 }
4122 }
4123
4124 /* Disable receiver
4125 */
4126 static void rx_stop(SLMP_INFO *info)
4127 {
4128 if (debug_level >= DEBUG_LEVEL_ISR)
4129 printk("%s(%d):%s rx_stop()\n",
4130 __FILE__,__LINE__, info->device_name );
4131
4132 write_reg(info, CMD, RXRESET);
4133
4134 info->ie0_value &= ~RXRDYE;
4135 write_reg(info, IE0, info->ie0_value); /* disable Rx data interrupts */
4136
4137 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4138 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4139 write_reg(info, RXDMA + DIR, 0); /* disable Rx DMA interrupts */
4140
4141 info->rx_enabled = false;
4142 info->rx_overflow = false;
4143 }
4144
4145 /* enable the receiver
4146 */
4147 static void rx_start(SLMP_INFO *info)
4148 {
4149 int i;
4150
4151 if (debug_level >= DEBUG_LEVEL_ISR)
4152 printk("%s(%d):%s rx_start()\n",
4153 __FILE__,__LINE__, info->device_name );
4154
4155 write_reg(info, CMD, RXRESET);
4156
4157 if ( info->params.mode == MGSL_MODE_HDLC ) {
4158 /* HDLC, disabe IRQ on rxdata */
4159 info->ie0_value &= ~RXRDYE;
4160 write_reg(info, IE0, info->ie0_value);
4161
4162 /* Reset all Rx DMA buffers and program rx dma */
4163 write_reg(info, RXDMA + DSR, 0); /* disable Rx DMA */
4164 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4165
4166 for (i = 0; i < info->rx_buf_count; i++) {
4167 info->rx_buf_list[i].status = 0xff;
4168
4169 // throttle to 4 shared memory writes at a time to prevent
4170 // hogging local bus (keep latency time for DMA requests low).
4171 if (!(i % 4))
4172 read_status_reg(info);
4173 }
4174 info->current_rx_buf = 0;
4175
4176 /* set current/1st descriptor address */
4177 write_reg16(info, RXDMA + CDA,
4178 info->rx_buf_list_ex[0].phys_entry);
4179
4180 /* set new last rx descriptor address */
4181 write_reg16(info, RXDMA + EDA,
4182 info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4183
4184 /* set buffer length (shared by all rx dma data buffers) */
4185 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4186
4187 write_reg(info, RXDMA + DIR, 0x60); /* enable Rx DMA interrupts (EOM/BOF) */
4188 write_reg(info, RXDMA + DSR, 0xf2); /* clear Rx DMA IRQs, enable Rx DMA */
4189 } else {
4190 /* async, enable IRQ on rxdata */
4191 info->ie0_value |= RXRDYE;
4192 write_reg(info, IE0, info->ie0_value);
4193 }
4194
4195 write_reg(info, CMD, RXENABLE);
4196
4197 info->rx_overflow = false;
4198 info->rx_enabled = true;
4199 }
4200
4201 /* Enable the transmitter and send a transmit frame if
4202 * one is loaded in the DMA buffers.
4203 */
4204 static void tx_start(SLMP_INFO *info)
4205 {
4206 if (debug_level >= DEBUG_LEVEL_ISR)
4207 printk("%s(%d):%s tx_start() tx_count=%d\n",
4208 __FILE__,__LINE__, info->device_name,info->tx_count );
4209
4210 if (!info->tx_enabled ) {
4211 write_reg(info, CMD, TXRESET);
4212 write_reg(info, CMD, TXENABLE);
4213 info->tx_enabled = true;
4214 }
4215
4216 if ( info->tx_count ) {
4217
4218 /* If auto RTS enabled and RTS is inactive, then assert */
4219 /* RTS and set a flag indicating that the driver should */
4220 /* negate RTS when the transmission completes. */
4221
4222 info->drop_rts_on_tx_done = false;
4223
4224 if (info->params.mode != MGSL_MODE_ASYNC) {
4225
4226 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4227 get_signals( info );
4228 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4229 info->serial_signals |= SerialSignal_RTS;
4230 set_signals( info );
4231 info->drop_rts_on_tx_done = true;
4232 }
4233 }
4234
4235 write_reg16(info, TRC0,
4236 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4237
4238 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4239 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4240
4241 /* set TX CDA (current descriptor address) */
4242 write_reg16(info, TXDMA + CDA,
4243 info->tx_buf_list_ex[0].phys_entry);
4244
4245 /* set TX EDA (last descriptor address) */
4246 write_reg16(info, TXDMA + EDA,
4247 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4248
4249 /* enable underrun IRQ */
4250 info->ie1_value &= ~IDLE;
4251 info->ie1_value |= UDRN;
4252 write_reg(info, IE1, info->ie1_value);
4253 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4254
4255 write_reg(info, TXDMA + DIR, 0x40); /* enable Tx DMA interrupts (EOM) */
4256 write_reg(info, TXDMA + DSR, 0xf2); /* clear Tx DMA IRQs, enable Tx DMA */
4257
4258 mod_timer(&info->tx_timer, jiffies +
4259 msecs_to_jiffies(5000));
4260 }
4261 else {
4262 tx_load_fifo(info);
4263 /* async, enable IRQ on txdata */
4264 info->ie0_value |= TXRDYE;
4265 write_reg(info, IE0, info->ie0_value);
4266 }
4267
4268 info->tx_active = true;
4269 }
4270 }
4271
4272 /* stop the transmitter and DMA
4273 */
4274 static void tx_stop( SLMP_INFO *info )
4275 {
4276 if (debug_level >= DEBUG_LEVEL_ISR)
4277 printk("%s(%d):%s tx_stop()\n",
4278 __FILE__,__LINE__, info->device_name );
4279
4280 del_timer(&info->tx_timer);
4281
4282 write_reg(info, TXDMA + DSR, 0); /* disable DMA channel */
4283 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4284
4285 write_reg(info, CMD, TXRESET);
4286
4287 info->ie1_value &= ~(UDRN + IDLE);
4288 write_reg(info, IE1, info->ie1_value); /* disable tx status interrupts */
4289 write_reg(info, SR1, (unsigned char)(IDLE + UDRN)); /* clear pending */
4290
4291 info->ie0_value &= ~TXRDYE;
4292 write_reg(info, IE0, info->ie0_value); /* disable tx data interrupts */
4293
4294 info->tx_enabled = false;
4295 info->tx_active = false;
4296 }
4297
4298 /* Fill the transmit FIFO until the FIFO is full or
4299 * there is no more data to load.
4300 */
4301 static void tx_load_fifo(SLMP_INFO *info)
4302 {
4303 u8 TwoBytes[2];
4304
4305 /* do nothing is now tx data available and no XON/XOFF pending */
4306
4307 if ( !info->tx_count && !info->x_char )
4308 return;
4309
4310 /* load the Transmit FIFO until FIFOs full or all data sent */
4311
4312 while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4313
4314 /* there is more space in the transmit FIFO and */
4315 /* there is more data in transmit buffer */
4316
4317 if ( (info->tx_count > 1) && !info->x_char ) {
4318 /* write 16-bits */
4319 TwoBytes[0] = info->tx_buf[info->tx_get++];
4320 if (info->tx_get >= info->max_frame_size)
4321 info->tx_get -= info->max_frame_size;
4322 TwoBytes[1] = info->tx_buf[info->tx_get++];
4323 if (info->tx_get >= info->max_frame_size)
4324 info->tx_get -= info->max_frame_size;
4325
4326 write_reg16(info, TRB, *((u16 *)TwoBytes));
4327
4328 info->tx_count -= 2;
4329 info->icount.tx += 2;
4330 } else {
4331 /* only 1 byte left to transmit or 1 FIFO slot left */
4332
4333 if (info->x_char) {
4334 /* transmit pending high priority char */
4335 write_reg(info, TRB, info->x_char);
4336 info->x_char = 0;
4337 } else {
4338 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4339 if (info->tx_get >= info->max_frame_size)
4340 info->tx_get -= info->max_frame_size;
4341 info->tx_count--;
4342 }
4343 info->icount.tx++;
4344 }
4345 }
4346 }
4347
4348 /* Reset a port to a known state
4349 */
4350 static void reset_port(SLMP_INFO *info)
4351 {
4352 if (info->sca_base) {
4353
4354 tx_stop(info);
4355 rx_stop(info);
4356
4357 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4358 set_signals(info);
4359
4360 /* disable all port interrupts */
4361 info->ie0_value = 0;
4362 info->ie1_value = 0;
4363 info->ie2_value = 0;
4364 write_reg(info, IE0, info->ie0_value);
4365 write_reg(info, IE1, info->ie1_value);
4366 write_reg(info, IE2, info->ie2_value);
4367
4368 write_reg(info, CMD, CHRESET);
4369 }
4370 }
4371
4372 /* Reset all the ports to a known state.
4373 */
4374 static void reset_adapter(SLMP_INFO *info)
4375 {
4376 int i;
4377
4378 for ( i=0; i < SCA_MAX_PORTS; ++i) {
4379 if (info->port_array[i])
4380 reset_port(info->port_array[i]);
4381 }
4382 }
4383
4384 /* Program port for asynchronous communications.
4385 */
4386 static void async_mode(SLMP_INFO *info)
4387 {
4388
4389 unsigned char RegValue;
4390
4391 tx_stop(info);
4392 rx_stop(info);
4393
4394 /* MD0, Mode Register 0
4395 *
4396 * 07..05 PRCTL<2..0>, Protocol Mode, 000=async
4397 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4398 * 03 Reserved, must be 0
4399 * 02 CRCCC, CRC Calculation, 0=disabled
4400 * 01..00 STOP<1..0> Stop bits (00=1,10=2)
4401 *
4402 * 0000 0000
4403 */
4404 RegValue = 0x00;
4405 if (info->params.stop_bits != 1)
4406 RegValue |= BIT1;
4407 write_reg(info, MD0, RegValue);
4408
4409 /* MD1, Mode Register 1
4410 *
4411 * 07..06 BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4412 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4413 * 03..02 RXCHR<1..0>, rx char size
4414 * 01..00 PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4415 *
4416 * 0100 0000
4417 */
4418 RegValue = 0x40;
4419 switch (info->params.data_bits) {
4420 case 7: RegValue |= BIT4 + BIT2; break;
4421 case 6: RegValue |= BIT5 + BIT3; break;
4422 case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4423 }
4424 if (info->params.parity != ASYNC_PARITY_NONE) {
4425 RegValue |= BIT1;
4426 if (info->params.parity == ASYNC_PARITY_ODD)
4427 RegValue |= BIT0;
4428 }
4429 write_reg(info, MD1, RegValue);
4430
4431 /* MD2, Mode Register 2
4432 *
4433 * 07..02 Reserved, must be 0
4434 * 01..00 CNCT<1..0> Channel connection, 00=normal 11=local loopback
4435 *
4436 * 0000 0000
4437 */
4438 RegValue = 0x00;
4439 if (info->params.loopback)
4440 RegValue |= (BIT1 + BIT0);
4441 write_reg(info, MD2, RegValue);
4442
4443 /* RXS, Receive clock source
4444 *
4445 * 07 Reserved, must be 0
4446 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4447 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4448 */
4449 RegValue=BIT6;
4450 write_reg(info, RXS, RegValue);
4451
4452 /* TXS, Transmit clock source
4453 *
4454 * 07 Reserved, must be 0
4455 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4456 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4457 */
4458 RegValue=BIT6;
4459 write_reg(info, TXS, RegValue);
4460
4461 /* Control Register
4462 *
4463 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4464 */
4465 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4466 write_control_reg(info);
4467
4468 tx_set_idle(info);
4469
4470 /* RRC Receive Ready Control 0
4471 *
4472 * 07..05 Reserved, must be 0
4473 * 04..00 RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4474 */
4475 write_reg(info, RRC, 0x00);
4476
4477 /* TRC0 Transmit Ready Control 0
4478 *
4479 * 07..05 Reserved, must be 0
4480 * 04..00 TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4481 */
4482 write_reg(info, TRC0, 0x10);
4483
4484 /* TRC1 Transmit Ready Control 1
4485 *
4486 * 07..05 Reserved, must be 0
4487 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4488 */
4489 write_reg(info, TRC1, 0x1e);
4490
4491 /* CTL, MSCI control register
4492 *
4493 * 07..06 Reserved, set to 0
4494 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4495 * 04 IDLC, idle control, 0=mark 1=idle register
4496 * 03 BRK, break, 0=off 1 =on (async)
4497 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4498 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4499 * 00 RTS, RTS output control, 0=active 1=inactive
4500 *
4501 * 0001 0001
4502 */
4503 RegValue = 0x10;
4504 if (!(info->serial_signals & SerialSignal_RTS))
4505 RegValue |= 0x01;
4506 write_reg(info, CTL, RegValue);
4507
4508 /* enable status interrupts */
4509 info->ie0_value |= TXINTE + RXINTE;
4510 write_reg(info, IE0, info->ie0_value);
4511
4512 /* enable break detect interrupt */
4513 info->ie1_value = BRKD;
4514 write_reg(info, IE1, info->ie1_value);
4515
4516 /* enable rx overrun interrupt */
4517 info->ie2_value = OVRN;
4518 write_reg(info, IE2, info->ie2_value);
4519
4520 set_rate( info, info->params.data_rate * 16 );
4521 }
4522
4523 /* Program the SCA for HDLC communications.
4524 */
4525 static void hdlc_mode(SLMP_INFO *info)
4526 {
4527 unsigned char RegValue;
4528 u32 DpllDivisor;
4529
4530 // Can't use DPLL because SCA outputs recovered clock on RxC when
4531 // DPLL mode selected. This causes output contention with RxC receiver.
4532 // Use of DPLL would require external hardware to disable RxC receiver
4533 // when DPLL mode selected.
4534 info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4535
4536 /* disable DMA interrupts */
4537 write_reg(info, TXDMA + DIR, 0);
4538 write_reg(info, RXDMA + DIR, 0);
4539
4540 /* MD0, Mode Register 0
4541 *
4542 * 07..05 PRCTL<2..0>, Protocol Mode, 100=HDLC
4543 * 04 AUTO, Auto-enable (RTS/CTS/DCD)
4544 * 03 Reserved, must be 0
4545 * 02 CRCCC, CRC Calculation, 1=enabled
4546 * 01 CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4547 * 00 CRC0, CRC initial value, 1 = all 1s
4548 *
4549 * 1000 0001
4550 */
4551 RegValue = 0x81;
4552 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4553 RegValue |= BIT4;
4554 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4555 RegValue |= BIT4;
4556 if (info->params.crc_type == HDLC_CRC_16_CCITT)
4557 RegValue |= BIT2 + BIT1;
4558 write_reg(info, MD0, RegValue);
4559
4560 /* MD1, Mode Register 1
4561 *
4562 * 07..06 ADDRS<1..0>, Address detect, 00=no addr check
4563 * 05..04 TXCHR<1..0>, tx char size, 00=8 bits
4564 * 03..02 RXCHR<1..0>, rx char size, 00=8 bits
4565 * 01..00 PMPM<1..0>, Parity mode, 00=no parity
4566 *
4567 * 0000 0000
4568 */
4569 RegValue = 0x00;
4570 write_reg(info, MD1, RegValue);
4571
4572 /* MD2, Mode Register 2
4573 *
4574 * 07 NRZFM, 0=NRZ, 1=FM
4575 * 06..05 CODE<1..0> Encoding, 00=NRZ
4576 * 04..03 DRATE<1..0> DPLL Divisor, 00=8
4577 * 02 Reserved, must be 0
4578 * 01..00 CNCT<1..0> Channel connection, 0=normal
4579 *
4580 * 0000 0000
4581 */
4582 RegValue = 0x00;
4583 switch(info->params.encoding) {
4584 case HDLC_ENCODING_NRZI: RegValue |= BIT5; break;
4585 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4586 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4587 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break; /* aka Manchester */
4588 #if 0
4589 case HDLC_ENCODING_NRZB: /* not supported */
4590 case HDLC_ENCODING_NRZI_MARK: /* not supported */
4591 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: /* not supported */
4592 #endif
4593 }
4594 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4595 DpllDivisor = 16;
4596 RegValue |= BIT3;
4597 } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4598 DpllDivisor = 8;
4599 } else {
4600 DpllDivisor = 32;
4601 RegValue |= BIT4;
4602 }
4603 write_reg(info, MD2, RegValue);
4604
4605
4606 /* RXS, Receive clock source
4607 *
4608 * 07 Reserved, must be 0
4609 * 06..04 RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4610 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4611 */
4612 RegValue=0;
4613 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4614 RegValue |= BIT6;
4615 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4616 RegValue |= BIT6 + BIT5;
4617 write_reg(info, RXS, RegValue);
4618
4619 /* TXS, Transmit clock source
4620 *
4621 * 07 Reserved, must be 0
4622 * 06..04 RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4623 * 03..00 RXBR<3..0>, rate divisor, 0000=1
4624 */
4625 RegValue=0;
4626 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4627 RegValue |= BIT6;
4628 if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4629 RegValue |= BIT6 + BIT5;
4630 write_reg(info, TXS, RegValue);
4631
4632 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4633 set_rate(info, info->params.clock_speed * DpllDivisor);
4634 else
4635 set_rate(info, info->params.clock_speed);
4636
4637 /* GPDATA (General Purpose I/O Data Register)
4638 *
4639 * 6,4,2,0 CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4640 */
4641 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4642 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4643 else
4644 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4645 write_control_reg(info);
4646
4647 /* RRC Receive Ready Control 0
4648 *
4649 * 07..05 Reserved, must be 0
4650 * 04..00 RRC<4..0> Rx FIFO trigger active
4651 */
4652 write_reg(info, RRC, rx_active_fifo_level);
4653
4654 /* TRC0 Transmit Ready Control 0
4655 *
4656 * 07..05 Reserved, must be 0
4657 * 04..00 TRC<4..0> Tx FIFO trigger active
4658 */
4659 write_reg(info, TRC0, tx_active_fifo_level);
4660
4661 /* TRC1 Transmit Ready Control 1
4662 *
4663 * 07..05 Reserved, must be 0
4664 * 04..00 TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4665 */
4666 write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4667
4668 /* DMR, DMA Mode Register
4669 *
4670 * 07..05 Reserved, must be 0
4671 * 04 TMOD, Transfer Mode: 1=chained-block
4672 * 03 Reserved, must be 0
4673 * 02 NF, Number of Frames: 1=multi-frame
4674 * 01 CNTE, Frame End IRQ Counter enable: 0=disabled
4675 * 00 Reserved, must be 0
4676 *
4677 * 0001 0100
4678 */
4679 write_reg(info, TXDMA + DMR, 0x14);
4680 write_reg(info, RXDMA + DMR, 0x14);
4681
4682 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4683 write_reg(info, RXDMA + CPB,
4684 (unsigned char)(info->buffer_list_phys >> 16));
4685
4686 /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4687 write_reg(info, TXDMA + CPB,
4688 (unsigned char)(info->buffer_list_phys >> 16));
4689
4690 /* enable status interrupts. other code enables/disables
4691 * the individual sources for these two interrupt classes.
4692 */
4693 info->ie0_value |= TXINTE + RXINTE;
4694 write_reg(info, IE0, info->ie0_value);
4695
4696 /* CTL, MSCI control register
4697 *
4698 * 07..06 Reserved, set to 0
4699 * 05 UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4700 * 04 IDLC, idle control, 0=mark 1=idle register
4701 * 03 BRK, break, 0=off 1 =on (async)
4702 * 02 SYNCLD, sync char load enable (BSC) 1=enabled
4703 * 01 GOP, go active on poll (LOOP mode) 1=enabled
4704 * 00 RTS, RTS output control, 0=active 1=inactive
4705 *
4706 * 0001 0001
4707 */
4708 RegValue = 0x10;
4709 if (!(info->serial_signals & SerialSignal_RTS))
4710 RegValue |= 0x01;
4711 write_reg(info, CTL, RegValue);
4712
4713 /* preamble not supported ! */
4714
4715 tx_set_idle(info);
4716 tx_stop(info);
4717 rx_stop(info);
4718
4719 set_rate(info, info->params.clock_speed);
4720
4721 if (info->params.loopback)
4722 enable_loopback(info,1);
4723 }
4724
4725 /* Set the transmit HDLC idle mode
4726 */
4727 static void tx_set_idle(SLMP_INFO *info)
4728 {
4729 unsigned char RegValue = 0xff;
4730
4731 /* Map API idle mode to SCA register bits */
4732 switch(info->idle_mode) {
4733 case HDLC_TXIDLE_FLAGS: RegValue = 0x7e; break;
4734 case HDLC_TXIDLE_ALT_ZEROS_ONES: RegValue = 0xaa; break;
4735 case HDLC_TXIDLE_ZEROS: RegValue = 0x00; break;
4736 case HDLC_TXIDLE_ONES: RegValue = 0xff; break;
4737 case HDLC_TXIDLE_ALT_MARK_SPACE: RegValue = 0xaa; break;
4738 case HDLC_TXIDLE_SPACE: RegValue = 0x00; break;
4739 case HDLC_TXIDLE_MARK: RegValue = 0xff; break;
4740 }
4741
4742 write_reg(info, IDL, RegValue);
4743 }
4744
4745 /* Query the adapter for the state of the V24 status (input) signals.
4746 */
4747 static void get_signals(SLMP_INFO *info)
4748 {
4749 u16 status = read_reg(info, SR3);
4750 u16 gpstatus = read_status_reg(info);
4751 u16 testbit;
4752
4753 /* clear all serial signals except DTR and RTS */
4754 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4755
4756 /* set serial signal bits to reflect MISR */
4757
4758 if (!(status & BIT3))
4759 info->serial_signals |= SerialSignal_CTS;
4760
4761 if ( !(status & BIT2))
4762 info->serial_signals |= SerialSignal_DCD;
4763
4764 testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4765 if (!(gpstatus & testbit))
4766 info->serial_signals |= SerialSignal_RI;
4767
4768 testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4769 if (!(gpstatus & testbit))
4770 info->serial_signals |= SerialSignal_DSR;
4771 }
4772
4773 /* Set the state of DTR and RTS based on contents of
4774 * serial_signals member of device context.
4775 */
4776 static void set_signals(SLMP_INFO *info)
4777 {
4778 unsigned char RegValue;
4779 u16 EnableBit;
4780
4781 RegValue = read_reg(info, CTL);
4782 if (info->serial_signals & SerialSignal_RTS)
4783 RegValue &= ~BIT0;
4784 else
4785 RegValue |= BIT0;
4786 write_reg(info, CTL, RegValue);
4787
4788 // Port 0..3 DTR is ctrl reg <1,3,5,7>
4789 EnableBit = BIT1 << (info->port_num*2);
4790 if (info->serial_signals & SerialSignal_DTR)
4791 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4792 else
4793 info->port_array[0]->ctrlreg_value |= EnableBit;
4794 write_control_reg(info);
4795 }
4796
4797 /*******************/
4798 /* DMA Buffer Code */
4799 /*******************/
4800
4801 /* Set the count for all receive buffers to SCABUFSIZE
4802 * and set the current buffer to the first buffer. This effectively
4803 * makes all buffers free and discards any data in buffers.
4804 */
4805 static void rx_reset_buffers(SLMP_INFO *info)
4806 {
4807 rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4808 }
4809
4810 /* Free the buffers used by a received frame
4811 *
4812 * info pointer to device instance data
4813 * first index of 1st receive buffer of frame
4814 * last index of last receive buffer of frame
4815 */
4816 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4817 {
4818 bool done = false;
4819
4820 while(!done) {
4821 /* reset current buffer for reuse */
4822 info->rx_buf_list[first].status = 0xff;
4823
4824 if (first == last) {
4825 done = true;
4826 /* set new last rx descriptor address */
4827 write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4828 }
4829
4830 first++;
4831 if (first == info->rx_buf_count)
4832 first = 0;
4833 }
4834
4835 /* set current buffer to next buffer after last buffer of frame */
4836 info->current_rx_buf = first;
4837 }
4838
4839 /* Return a received frame from the receive DMA buffers.
4840 * Only frames received without errors are returned.
4841 *
4842 * Return Value: true if frame returned, otherwise false
4843 */
4844 static bool rx_get_frame(SLMP_INFO *info)
4845 {
4846 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
4847 unsigned short status;
4848 unsigned int framesize = 0;
4849 bool ReturnCode = false;
4850 unsigned long flags;
4851 struct tty_struct *tty = info->port.tty;
4852 unsigned char addr_field = 0xff;
4853 SCADESC *desc;
4854 SCADESC_EX *desc_ex;
4855
4856 CheckAgain:
4857 /* assume no frame returned, set zero length */
4858 framesize = 0;
4859 addr_field = 0xff;
4860
4861 /*
4862 * current_rx_buf points to the 1st buffer of the next available
4863 * receive frame. To find the last buffer of the frame look for
4864 * a non-zero status field in the buffer entries. (The status
4865 * field is set by the 16C32 after completing a receive frame.
4866 */
4867 StartIndex = EndIndex = info->current_rx_buf;
4868
4869 for ( ;; ) {
4870 desc = &info->rx_buf_list[EndIndex];
4871 desc_ex = &info->rx_buf_list_ex[EndIndex];
4872
4873 if (desc->status == 0xff)
4874 goto Cleanup; /* current desc still in use, no frames available */
4875
4876 if (framesize == 0 && info->params.addr_filter != 0xff)
4877 addr_field = desc_ex->virt_addr[0];
4878
4879 framesize += desc->length;
4880
4881 /* Status != 0 means last buffer of frame */
4882 if (desc->status)
4883 break;
4884
4885 EndIndex++;
4886 if (EndIndex == info->rx_buf_count)
4887 EndIndex = 0;
4888
4889 if (EndIndex == info->current_rx_buf) {
4890 /* all buffers have been 'used' but none mark */
4891 /* the end of a frame. Reset buffers and receiver. */
4892 if ( info->rx_enabled ){
4893 spin_lock_irqsave(&info->lock,flags);
4894 rx_start(info);
4895 spin_unlock_irqrestore(&info->lock,flags);
4896 }
4897 goto Cleanup;
4898 }
4899
4900 }
4901
4902 /* check status of receive frame */
4903
4904 /* frame status is byte stored after frame data
4905 *
4906 * 7 EOM (end of msg), 1 = last buffer of frame
4907 * 6 Short Frame, 1 = short frame
4908 * 5 Abort, 1 = frame aborted
4909 * 4 Residue, 1 = last byte is partial
4910 * 3 Overrun, 1 = overrun occurred during frame reception
4911 * 2 CRC, 1 = CRC error detected
4912 *
4913 */
4914 status = desc->status;
4915
4916 /* ignore CRC bit if not using CRC (bit is undefined) */
4917 /* Note:CRC is not save to data buffer */
4918 if (info->params.crc_type == HDLC_CRC_NONE)
4919 status &= ~BIT2;
4920
4921 if (framesize == 0 ||
4922 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4923 /* discard 0 byte frames, this seems to occur sometime
4924 * when remote is idling flags.
4925 */
4926 rx_free_frame_buffers(info, StartIndex, EndIndex);
4927 goto CheckAgain;
4928 }
4929
4930 if (framesize < 2)
4931 status |= BIT6;
4932
4933 if (status & (BIT6+BIT5+BIT3+BIT2)) {
4934 /* received frame has errors,
4935 * update counts and mark frame size as 0
4936 */
4937 if (status & BIT6)
4938 info->icount.rxshort++;
4939 else if (status & BIT5)
4940 info->icount.rxabort++;
4941 else if (status & BIT3)
4942 info->icount.rxover++;
4943 else
4944 info->icount.rxcrc++;
4945
4946 framesize = 0;
4947 #if SYNCLINK_GENERIC_HDLC
4948 {
4949 info->netdev->stats.rx_errors++;
4950 info->netdev->stats.rx_frame_errors++;
4951 }
4952 #endif
4953 }
4954
4955 if ( debug_level >= DEBUG_LEVEL_BH )
4956 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4957 __FILE__,__LINE__,info->device_name,status,framesize);
4958
4959 if ( debug_level >= DEBUG_LEVEL_DATA )
4960 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4961 min_t(unsigned int, framesize, SCABUFSIZE), 0);
4962
4963 if (framesize) {
4964 if (framesize > info->max_frame_size)
4965 info->icount.rxlong++;
4966 else {
4967 /* copy dma buffer(s) to contiguous intermediate buffer */
4968 int copy_count = framesize;
4969 int index = StartIndex;
4970 unsigned char *ptmp = info->tmp_rx_buf;
4971 info->tmp_rx_buf_count = framesize;
4972
4973 info->icount.rxok++;
4974
4975 while(copy_count) {
4976 int partial_count = min(copy_count,SCABUFSIZE);
4977 memcpy( ptmp,
4978 info->rx_buf_list_ex[index].virt_addr,
4979 partial_count );
4980 ptmp += partial_count;
4981 copy_count -= partial_count;
4982
4983 if ( ++index == info->rx_buf_count )
4984 index = 0;
4985 }
4986
4987 #if SYNCLINK_GENERIC_HDLC
4988 if (info->netcount)
4989 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
4990 else
4991 #endif
4992 ldisc_receive_buf(tty,info->tmp_rx_buf,
4993 info->flag_buf, framesize);
4994 }
4995 }
4996 /* Free the buffers used by this frame. */
4997 rx_free_frame_buffers( info, StartIndex, EndIndex );
4998
4999 ReturnCode = true;
5000
5001 Cleanup:
5002 if ( info->rx_enabled && info->rx_overflow ) {
5003 /* Receiver is enabled, but needs to restarted due to
5004 * rx buffer overflow. If buffers are empty, restart receiver.
5005 */
5006 if (info->rx_buf_list[EndIndex].status == 0xff) {
5007 spin_lock_irqsave(&info->lock,flags);
5008 rx_start(info);
5009 spin_unlock_irqrestore(&info->lock,flags);
5010 }
5011 }
5012
5013 return ReturnCode;
5014 }
5015
5016 /* load the transmit DMA buffer with data
5017 */
5018 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5019 {
5020 unsigned short copy_count;
5021 unsigned int i = 0;
5022 SCADESC *desc;
5023 SCADESC_EX *desc_ex;
5024
5025 if ( debug_level >= DEBUG_LEVEL_DATA )
5026 trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
5027
5028 /* Copy source buffer to one or more DMA buffers, starting with
5029 * the first transmit dma buffer.
5030 */
5031 for(i=0;;)
5032 {
5033 copy_count = min_t(unsigned int, count, SCABUFSIZE);
5034
5035 desc = &info->tx_buf_list[i];
5036 desc_ex = &info->tx_buf_list_ex[i];
5037
5038 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5039
5040 desc->length = copy_count;
5041 desc->status = 0;
5042
5043 buf += copy_count;
5044 count -= copy_count;
5045
5046 if (!count)
5047 break;
5048
5049 i++;
5050 if (i >= info->tx_buf_count)
5051 i = 0;
5052 }
5053
5054 info->tx_buf_list[i].status = 0x81; /* set EOM and EOT status */
5055 info->last_tx_buf = ++i;
5056 }
5057
5058 static bool register_test(SLMP_INFO *info)
5059 {
5060 static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5061 static unsigned int count = ARRAY_SIZE(testval);
5062 unsigned int i;
5063 bool rc = true;
5064 unsigned long flags;
5065
5066 spin_lock_irqsave(&info->lock,flags);
5067 reset_port(info);
5068
5069 /* assume failure */
5070 info->init_error = DiagStatus_AddressFailure;
5071
5072 /* Write bit patterns to various registers but do it out of */
5073 /* sync, then read back and verify values. */
5074
5075 for (i = 0 ; i < count ; i++) {
5076 write_reg(info, TMC, testval[i]);
5077 write_reg(info, IDL, testval[(i+1)%count]);
5078 write_reg(info, SA0, testval[(i+2)%count]);
5079 write_reg(info, SA1, testval[(i+3)%count]);
5080
5081 if ( (read_reg(info, TMC) != testval[i]) ||
5082 (read_reg(info, IDL) != testval[(i+1)%count]) ||
5083 (read_reg(info, SA0) != testval[(i+2)%count]) ||
5084 (read_reg(info, SA1) != testval[(i+3)%count]) )
5085 {
5086 rc = false;
5087 break;
5088 }
5089 }
5090
5091 reset_port(info);
5092 spin_unlock_irqrestore(&info->lock,flags);
5093
5094 return rc;
5095 }
5096
5097 static bool irq_test(SLMP_INFO *info)
5098 {
5099 unsigned long timeout;
5100 unsigned long flags;
5101
5102 unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5103
5104 spin_lock_irqsave(&info->lock,flags);
5105 reset_port(info);
5106
5107 /* assume failure */
5108 info->init_error = DiagStatus_IrqFailure;
5109 info->irq_occurred = false;
5110
5111 /* setup timer0 on SCA0 to interrupt */
5112
5113 /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5114 write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5115
5116 write_reg(info, (unsigned char)(timer + TEPR), 0); /* timer expand prescale */
5117 write_reg16(info, (unsigned char)(timer + TCONR), 1); /* timer constant */
5118
5119
5120 /* TMCS, Timer Control/Status Register
5121 *
5122 * 07 CMF, Compare match flag (read only) 1=match
5123 * 06 ECMI, CMF Interrupt Enable: 1=enabled
5124 * 05 Reserved, must be 0
5125 * 04 TME, Timer Enable
5126 * 03..00 Reserved, must be 0
5127 *
5128 * 0101 0000
5129 */
5130 write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5131
5132 spin_unlock_irqrestore(&info->lock,flags);
5133
5134 timeout=100;
5135 while( timeout-- && !info->irq_occurred ) {
5136 msleep_interruptible(10);
5137 }
5138
5139 spin_lock_irqsave(&info->lock,flags);
5140 reset_port(info);
5141 spin_unlock_irqrestore(&info->lock,flags);
5142
5143 return info->irq_occurred;
5144 }
5145
5146 /* initialize individual SCA device (2 ports)
5147 */
5148 static bool sca_init(SLMP_INFO *info)
5149 {
5150 /* set wait controller to single mem partition (low), no wait states */
5151 write_reg(info, PABR0, 0); /* wait controller addr boundary 0 */
5152 write_reg(info, PABR1, 0); /* wait controller addr boundary 1 */
5153 write_reg(info, WCRL, 0); /* wait controller low range */
5154 write_reg(info, WCRM, 0); /* wait controller mid range */
5155 write_reg(info, WCRH, 0); /* wait controller high range */
5156
5157 /* DPCR, DMA Priority Control
5158 *
5159 * 07..05 Not used, must be 0
5160 * 04 BRC, bus release condition: 0=all transfers complete
5161 * 03 CCC, channel change condition: 0=every cycle
5162 * 02..00 PR<2..0>, priority 100=round robin
5163 *
5164 * 00000100 = 0x04
5165 */
5166 write_reg(info, DPCR, dma_priority);
5167
5168 /* DMA Master Enable, BIT7: 1=enable all channels */
5169 write_reg(info, DMER, 0x80);
5170
5171 /* enable all interrupt classes */
5172 write_reg(info, IER0, 0xff); /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5173 write_reg(info, IER1, 0xff); /* DMIB,DMIA (channels 0-3) */
5174 write_reg(info, IER2, 0xf0); /* TIRQ (timers 0-3) */
5175
5176 /* ITCR, interrupt control register
5177 * 07 IPC, interrupt priority, 0=MSCI->DMA
5178 * 06..05 IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5179 * 04 VOS, Vector Output, 0=unmodified vector
5180 * 03..00 Reserved, must be 0
5181 */
5182 write_reg(info, ITCR, 0);
5183
5184 return true;
5185 }
5186
5187 /* initialize adapter hardware
5188 */
5189 static bool init_adapter(SLMP_INFO *info)
5190 {
5191 int i;
5192
5193 /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5194 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5195 u32 readval;
5196
5197 info->misc_ctrl_value |= BIT30;
5198 *MiscCtrl = info->misc_ctrl_value;
5199
5200 /*
5201 * Force at least 170ns delay before clearing
5202 * reset bit. Each read from LCR takes at least
5203 * 30ns so 10 times for 300ns to be safe.
5204 */
5205 for(i=0;i<10;i++)
5206 readval = *MiscCtrl;
5207
5208 info->misc_ctrl_value &= ~BIT30;
5209 *MiscCtrl = info->misc_ctrl_value;
5210
5211 /* init control reg (all DTRs off, all clksel=input) */
5212 info->ctrlreg_value = 0xaa;
5213 write_control_reg(info);
5214
5215 {
5216 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5217 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5218
5219 switch(read_ahead_count)
5220 {
5221 case 16:
5222 lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5223 break;
5224 case 8:
5225 lcr1_brdr_value |= BIT5 + BIT4;
5226 break;
5227 case 4:
5228 lcr1_brdr_value |= BIT5 + BIT3;
5229 break;
5230 case 0:
5231 lcr1_brdr_value |= BIT5;
5232 break;
5233 }
5234
5235 *LCR1BRDR = lcr1_brdr_value;
5236 *MiscCtrl = misc_ctrl_value;
5237 }
5238
5239 sca_init(info->port_array[0]);
5240 sca_init(info->port_array[2]);
5241
5242 return true;
5243 }
5244
5245 /* Loopback an HDLC frame to test the hardware
5246 * interrupt and DMA functions.
5247 */
5248 static bool loopback_test(SLMP_INFO *info)
5249 {
5250 #define TESTFRAMESIZE 20
5251
5252 unsigned long timeout;
5253 u16 count = TESTFRAMESIZE;
5254 unsigned char buf[TESTFRAMESIZE];
5255 bool rc = false;
5256 unsigned long flags;
5257
5258 struct tty_struct *oldtty = info->port.tty;
5259 u32 speed = info->params.clock_speed;
5260
5261 info->params.clock_speed = 3686400;
5262 info->port.tty = NULL;
5263
5264 /* assume failure */
5265 info->init_error = DiagStatus_DmaFailure;
5266
5267 /* build and send transmit frame */
5268 for (count = 0; count < TESTFRAMESIZE;++count)
5269 buf[count] = (unsigned char)count;
5270
5271 memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5272
5273 /* program hardware for HDLC and enabled receiver */
5274 spin_lock_irqsave(&info->lock,flags);
5275 hdlc_mode(info);
5276 enable_loopback(info,1);
5277 rx_start(info);
5278 info->tx_count = count;
5279 tx_load_dma_buffer(info,buf,count);
5280 tx_start(info);
5281 spin_unlock_irqrestore(&info->lock,flags);
5282
5283 /* wait for receive complete */
5284 /* Set a timeout for waiting for interrupt. */
5285 for ( timeout = 100; timeout; --timeout ) {
5286 msleep_interruptible(10);
5287
5288 if (rx_get_frame(info)) {
5289 rc = true;
5290 break;
5291 }
5292 }
5293
5294 /* verify received frame length and contents */
5295 if (rc &&
5296 ( info->tmp_rx_buf_count != count ||
5297 memcmp(buf, info->tmp_rx_buf,count))) {
5298 rc = false;
5299 }
5300
5301 spin_lock_irqsave(&info->lock,flags);
5302 reset_adapter(info);
5303 spin_unlock_irqrestore(&info->lock,flags);
5304
5305 info->params.clock_speed = speed;
5306 info->port.tty = oldtty;
5307
5308 return rc;
5309 }
5310
5311 /* Perform diagnostics on hardware
5312 */
5313 static int adapter_test( SLMP_INFO *info )
5314 {
5315 unsigned long flags;
5316 if ( debug_level >= DEBUG_LEVEL_INFO )
5317 printk( "%s(%d):Testing device %s\n",
5318 __FILE__,__LINE__,info->device_name );
5319
5320 spin_lock_irqsave(&info->lock,flags);
5321 init_adapter(info);
5322 spin_unlock_irqrestore(&info->lock,flags);
5323
5324 info->port_array[0]->port_count = 0;
5325
5326 if ( register_test(info->port_array[0]) &&
5327 register_test(info->port_array[1])) {
5328
5329 info->port_array[0]->port_count = 2;
5330
5331 if ( register_test(info->port_array[2]) &&
5332 register_test(info->port_array[3]) )
5333 info->port_array[0]->port_count += 2;
5334 }
5335 else {
5336 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5337 __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5338 return -ENODEV;
5339 }
5340
5341 if ( !irq_test(info->port_array[0]) ||
5342 !irq_test(info->port_array[1]) ||
5343 (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5344 (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5345 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5346 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5347 return -ENODEV;
5348 }
5349
5350 if (!loopback_test(info->port_array[0]) ||
5351 !loopback_test(info->port_array[1]) ||
5352 (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5353 (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5354 printk( "%s(%d):DMA test failure for device %s\n",
5355 __FILE__,__LINE__,info->device_name);
5356 return -ENODEV;
5357 }
5358
5359 if ( debug_level >= DEBUG_LEVEL_INFO )
5360 printk( "%s(%d):device %s passed diagnostics\n",
5361 __FILE__,__LINE__,info->device_name );
5362
5363 info->port_array[0]->init_error = 0;
5364 info->port_array[1]->init_error = 0;
5365 if ( info->port_count > 2 ) {
5366 info->port_array[2]->init_error = 0;
5367 info->port_array[3]->init_error = 0;
5368 }
5369
5370 return 0;
5371 }
5372
5373 /* Test the shared memory on a PCI adapter.
5374 */
5375 static bool memory_test(SLMP_INFO *info)
5376 {
5377 static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5378 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5379 unsigned long count = ARRAY_SIZE(testval);
5380 unsigned long i;
5381 unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5382 unsigned long * addr = (unsigned long *)info->memory_base;
5383
5384 /* Test data lines with test pattern at one location. */
5385
5386 for ( i = 0 ; i < count ; i++ ) {
5387 *addr = testval[i];
5388 if ( *addr != testval[i] )
5389 return false;
5390 }
5391
5392 /* Test address lines with incrementing pattern over */
5393 /* entire address range. */
5394
5395 for ( i = 0 ; i < limit ; i++ ) {
5396 *addr = i * 4;
5397 addr++;
5398 }
5399
5400 addr = (unsigned long *)info->memory_base;
5401
5402 for ( i = 0 ; i < limit ; i++ ) {
5403 if ( *addr != i * 4 )
5404 return false;
5405 addr++;
5406 }
5407
5408 memset( info->memory_base, 0, SCA_MEM_SIZE );
5409 return true;
5410 }
5411
5412 /* Load data into PCI adapter shared memory.
5413 *
5414 * The PCI9050 releases control of the local bus
5415 * after completing the current read or write operation.
5416 *
5417 * While the PCI9050 write FIFO not empty, the
5418 * PCI9050 treats all of the writes as a single transaction
5419 * and does not release the bus. This causes DMA latency problems
5420 * at high speeds when copying large data blocks to the shared memory.
5421 *
5422 * This function breaks a write into multiple transations by
5423 * interleaving a read which flushes the write FIFO and 'completes'
5424 * the write transation. This allows any pending DMA request to gain control
5425 * of the local bus in a timely fasion.
5426 */
5427 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5428 {
5429 /* A load interval of 16 allows for 4 32-bit writes at */
5430 /* 136ns each for a maximum latency of 542ns on the local bus.*/
5431
5432 unsigned short interval = count / sca_pci_load_interval;
5433 unsigned short i;
5434
5435 for ( i = 0 ; i < interval ; i++ )
5436 {
5437 memcpy(dest, src, sca_pci_load_interval);
5438 read_status_reg(info);
5439 dest += sca_pci_load_interval;
5440 src += sca_pci_load_interval;
5441 }
5442
5443 memcpy(dest, src, count % sca_pci_load_interval);
5444 }
5445
5446 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5447 {
5448 int i;
5449 int linecount;
5450 if (xmit)
5451 printk("%s tx data:\n",info->device_name);
5452 else
5453 printk("%s rx data:\n",info->device_name);
5454
5455 while(count) {
5456 if (count > 16)
5457 linecount = 16;
5458 else
5459 linecount = count;
5460
5461 for(i=0;i<linecount;i++)
5462 printk("%02X ",(unsigned char)data[i]);
5463 for(;i<17;i++)
5464 printk(" ");
5465 for(i=0;i<linecount;i++) {
5466 if (data[i]>=040 && data[i]<=0176)
5467 printk("%c",data[i]);
5468 else
5469 printk(".");
5470 }
5471 printk("\n");
5472
5473 data += linecount;
5474 count -= linecount;
5475 }
5476 } /* end of trace_block() */
5477
5478 /* called when HDLC frame times out
5479 * update stats and do tx completion processing
5480 */
5481 static void tx_timeout(unsigned long context)
5482 {
5483 SLMP_INFO *info = (SLMP_INFO*)context;
5484 unsigned long flags;
5485
5486 if ( debug_level >= DEBUG_LEVEL_INFO )
5487 printk( "%s(%d):%s tx_timeout()\n",
5488 __FILE__,__LINE__,info->device_name);
5489 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5490 info->icount.txtimeout++;
5491 }
5492 spin_lock_irqsave(&info->lock,flags);
5493 info->tx_active = false;
5494 info->tx_count = info->tx_put = info->tx_get = 0;
5495
5496 spin_unlock_irqrestore(&info->lock,flags);
5497
5498 #if SYNCLINK_GENERIC_HDLC
5499 if (info->netcount)
5500 hdlcdev_tx_done(info);
5501 else
5502 #endif
5503 bh_transmit(info);
5504 }
5505
5506 /* called to periodically check the DSR/RI modem signal input status
5507 */
5508 static void status_timeout(unsigned long context)
5509 {
5510 u16 status = 0;
5511 SLMP_INFO *info = (SLMP_INFO*)context;
5512 unsigned long flags;
5513 unsigned char delta;
5514
5515
5516 spin_lock_irqsave(&info->lock,flags);
5517 get_signals(info);
5518 spin_unlock_irqrestore(&info->lock,flags);
5519
5520 /* check for DSR/RI state change */
5521
5522 delta = info->old_signals ^ info->serial_signals;
5523 info->old_signals = info->serial_signals;
5524
5525 if (delta & SerialSignal_DSR)
5526 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5527
5528 if (delta & SerialSignal_RI)
5529 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5530
5531 if (delta & SerialSignal_DCD)
5532 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5533
5534 if (delta & SerialSignal_CTS)
5535 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5536
5537 if (status)
5538 isr_io_pin(info,status);
5539
5540 mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5541 }
5542
5543
5544 /* Register Access Routines -
5545 * All registers are memory mapped
5546 */
5547 #define CALC_REGADDR() \
5548 unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5549 if (info->port_num > 1) \
5550 RegAddr += 256; /* port 0-1 SCA0, 2-3 SCA1 */ \
5551 if ( info->port_num & 1) { \
5552 if (Addr > 0x7f) \
5553 RegAddr += 0x40; /* DMA access */ \
5554 else if (Addr > 0x1f && Addr < 0x60) \
5555 RegAddr += 0x20; /* MSCI access */ \
5556 }
5557
5558
5559 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5560 {
5561 CALC_REGADDR();
5562 return *RegAddr;
5563 }
5564 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5565 {
5566 CALC_REGADDR();
5567 *RegAddr = Value;
5568 }
5569
5570 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5571 {
5572 CALC_REGADDR();
5573 return *((u16 *)RegAddr);
5574 }
5575
5576 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5577 {
5578 CALC_REGADDR();
5579 *((u16 *)RegAddr) = Value;
5580 }
5581
5582 static unsigned char read_status_reg(SLMP_INFO * info)
5583 {
5584 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5585 return *RegAddr;
5586 }
5587
5588 static void write_control_reg(SLMP_INFO * info)
5589 {
5590 unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5591 *RegAddr = info->port_array[0]->ctrlreg_value;
5592 }
5593
5594
5595 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5596 const struct pci_device_id *ent)
5597 {
5598 if (pci_enable_device(dev)) {
5599 printk("error enabling pci device %p\n", dev);
5600 return -EIO;
5601 }
5602 device_init( ++synclinkmp_adapter_count, dev );
5603 return 0;
5604 }
5605
5606 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5607 {
5608 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree