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tty: synclink_gt add receive pio mode
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / synclink_gt.c
blob1386625fc4caae4bdf6a39e6835d0026b0e27ca7
1 /*
2 * Device driver for Microgate SyncLink GT serial adapters.
3 *
4 * written by Paul Fulghum for Microgate Corporation
5 * paulkf@microgate.com
6 *
7 * Microgate and SyncLink are trademarks of Microgate Corporation
8 *
9 * This code is released under the GNU General Public License (GPL)
10 *
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
14 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
15 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
16 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
17 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
18 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
19 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
20 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
21 * OF THE POSSIBILITY OF SUCH DAMAGE.
22 */
23
24 /*
25 * DEBUG OUTPUT DEFINITIONS
26 *
27 * uncomment lines below to enable specific types of debug output
28 *
29 * DBGINFO information - most verbose output
30 * DBGERR serious errors
31 * DBGBH bottom half service routine debugging
32 * DBGISR interrupt service routine debugging
33 * DBGDATA output receive and transmit data
34 * DBGTBUF output transmit DMA buffers and registers
35 * DBGRBUF output receive DMA buffers and registers
36 */
37
38 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
39 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
40 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
41 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
42 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
43 //#define DBGTBUF(info) dump_tbufs(info)
44 //#define DBGRBUF(info) dump_rbufs(info)
45
46
47 #include <linux/module.h>
48 #include <linux/errno.h>
49 #include <linux/signal.h>
50 #include <linux/sched.h>
51 #include <linux/timer.h>
52 #include <linux/interrupt.h>
53 #include <linux/pci.h>
54 #include <linux/tty.h>
55 #include <linux/tty_flip.h>
56 #include <linux/serial.h>
57 #include <linux/major.h>
58 #include <linux/string.h>
59 #include <linux/fcntl.h>
60 #include <linux/ptrace.h>
61 #include <linux/ioport.h>
62 #include <linux/mm.h>
63 #include <linux/seq_file.h>
64 #include <linux/slab.h>
65 #include <linux/netdevice.h>
66 #include <linux/vmalloc.h>
67 #include <linux/init.h>
68 #include <linux/delay.h>
69 #include <linux/ioctl.h>
70 #include <linux/termios.h>
71 #include <linux/bitops.h>
72 #include <linux/workqueue.h>
73 #include <linux/hdlc.h>
74 #include <linux/synclink.h>
75
76 #include <asm/system.h>
77 #include <asm/io.h>
78 #include <asm/irq.h>
79 #include <asm/dma.h>
80 #include <asm/types.h>
81 #include <asm/uaccess.h>
82
83 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
84 #define SYNCLINK_GENERIC_HDLC 1
85 #else
86 #define SYNCLINK_GENERIC_HDLC 0
87 #endif
88
89 /*
90 * module identification
91 */
92 static char *driver_name = "SyncLink GT";
93 static char *tty_driver_name = "synclink_gt";
94 static char *tty_dev_prefix = "ttySLG";
95 MODULE_LICENSE("GPL");
96 #define MGSL_MAGIC 0x5401
97 #define MAX_DEVICES 32
98
99 static struct pci_device_id pci_table[] = {
100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
103 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
104 {0,}, /* terminate list */
105 };
106 MODULE_DEVICE_TABLE(pci, pci_table);
107
108 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
109 static void remove_one(struct pci_dev *dev);
110 static struct pci_driver pci_driver = {
111 .name = "synclink_gt",
112 .id_table = pci_table,
113 .probe = init_one,
114 .remove = __devexit_p(remove_one),
115 };
116
117 static bool pci_registered;
118
119 /*
120 * module configuration and status
121 */
122 static struct slgt_info *slgt_device_list;
123 static int slgt_device_count;
124
125 static int ttymajor;
126 static int debug_level;
127 static int maxframe[MAX_DEVICES];
128
129 module_param(ttymajor, int, 0);
130 module_param(debug_level, int, 0);
131 module_param_array(maxframe, int, NULL, 0);
132
133 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
134 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
135 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
136
137 /*
138 * tty support and callbacks
139 */
140 static struct tty_driver *serial_driver;
141
142 static int open(struct tty_struct *tty, struct file * filp);
143 static void close(struct tty_struct *tty, struct file * filp);
144 static void hangup(struct tty_struct *tty);
145 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
146
147 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
148 static int put_char(struct tty_struct *tty, unsigned char ch);
149 static void send_xchar(struct tty_struct *tty, char ch);
150 static void wait_until_sent(struct tty_struct *tty, int timeout);
151 static int write_room(struct tty_struct *tty);
152 static void flush_chars(struct tty_struct *tty);
153 static void flush_buffer(struct tty_struct *tty);
154 static void tx_hold(struct tty_struct *tty);
155 static void tx_release(struct tty_struct *tty);
156
157 static int ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
158 static int chars_in_buffer(struct tty_struct *tty);
159 static void throttle(struct tty_struct * tty);
160 static void unthrottle(struct tty_struct * tty);
161 static int set_break(struct tty_struct *tty, int break_state);
162
163 /*
164 * generic HDLC support and callbacks
165 */
166 #if SYNCLINK_GENERIC_HDLC
167 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
168 static void hdlcdev_tx_done(struct slgt_info *info);
169 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
170 static int hdlcdev_init(struct slgt_info *info);
171 static void hdlcdev_exit(struct slgt_info *info);
172 #endif
173
174
175 /*
176 * device specific structures, macros and functions
177 */
178
179 #define SLGT_MAX_PORTS 4
180 #define SLGT_REG_SIZE 256
181
182 /*
183 * conditional wait facility
184 */
185 struct cond_wait {
186 struct cond_wait *next;
187 wait_queue_head_t q;
188 wait_queue_t wait;
189 unsigned int data;
190 };
191 static void init_cond_wait(struct cond_wait *w, unsigned int data);
192 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
193 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
194 static void flush_cond_wait(struct cond_wait **head);
195
196 /*
197 * DMA buffer descriptor and access macros
198 */
199 struct slgt_desc
200 {
201 __le16 count;
202 __le16 status;
203 __le32 pbuf; /* physical address of data buffer */
204 __le32 next; /* physical address of next descriptor */
205
206 /* driver book keeping */
207 char *buf; /* virtual address of data buffer */
208 unsigned int pdesc; /* physical address of this descriptor */
209 dma_addr_t buf_dma_addr;
210 unsigned short buf_count;
211 };
212
213 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
214 #define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
215 #define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
216 #define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
217 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
218 #define desc_count(a) (le16_to_cpu((a).count))
219 #define desc_status(a) (le16_to_cpu((a).status))
220 #define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
221 #define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
222 #define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
223 #define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
224 #define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
225
226 struct _input_signal_events {
227 int ri_up;
228 int ri_down;
229 int dsr_up;
230 int dsr_down;
231 int dcd_up;
232 int dcd_down;
233 int cts_up;
234 int cts_down;
235 };
236
237 /*
238 * device instance data structure
239 */
240 struct slgt_info {
241 void *if_ptr; /* General purpose pointer (used by SPPP) */
242 struct tty_port port;
243
244 struct slgt_info *next_device; /* device list link */
245
246 int magic;
247
248 char device_name[25];
249 struct pci_dev *pdev;
250
251 int port_count; /* count of ports on adapter */
252 int adapter_num; /* adapter instance number */
253 int port_num; /* port instance number */
254
255 /* array of pointers to port contexts on this adapter */
256 struct slgt_info *port_array[SLGT_MAX_PORTS];
257
258 int line; /* tty line instance number */
259
260 struct mgsl_icount icount;
261
262 int timeout;
263 int x_char; /* xon/xoff character */
264 unsigned int read_status_mask;
265 unsigned int ignore_status_mask;
266
267 wait_queue_head_t status_event_wait_q;
268 wait_queue_head_t event_wait_q;
269 struct timer_list tx_timer;
270 struct timer_list rx_timer;
271
272 unsigned int gpio_present;
273 struct cond_wait *gpio_wait_q;
274
275 spinlock_t lock; /* spinlock for synchronizing with ISR */
276
277 struct work_struct task;
278 u32 pending_bh;
279 bool bh_requested;
280 bool bh_running;
281
282 int isr_overflow;
283 bool irq_requested; /* true if IRQ requested */
284 bool irq_occurred; /* for diagnostics use */
285
286 /* device configuration */
287
288 unsigned int bus_type;
289 unsigned int irq_level;
290 unsigned long irq_flags;
291
292 unsigned char __iomem * reg_addr; /* memory mapped registers address */
293 u32 phys_reg_addr;
294 bool reg_addr_requested;
295
296 MGSL_PARAMS params; /* communications parameters */
297 u32 idle_mode;
298 u32 max_frame_size; /* as set by device config */
299
300 unsigned int rbuf_fill_level;
301 unsigned int rx_pio;
302 unsigned int if_mode;
303 unsigned int base_clock;
304
305 /* device status */
306
307 bool rx_enabled;
308 bool rx_restart;
309
310 bool tx_enabled;
311 bool tx_active;
312
313 unsigned char signals; /* serial signal states */
314 int init_error; /* initialization error */
315
316 unsigned char *tx_buf;
317 int tx_count;
318
319 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
320 char char_buf[MAX_ASYNC_BUFFER_SIZE];
321 bool drop_rts_on_tx_done;
322 struct _input_signal_events input_signal_events;
323
324 int dcd_chkcount; /* check counts to prevent */
325 int cts_chkcount; /* too many IRQs if a signal */
326 int dsr_chkcount; /* is floating */
327 int ri_chkcount;
328
329 char *bufs; /* virtual address of DMA buffer lists */
330 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
331
332 unsigned int rbuf_count;
333 struct slgt_desc *rbufs;
334 unsigned int rbuf_current;
335 unsigned int rbuf_index;
336 unsigned int rbuf_fill_index;
337 unsigned short rbuf_fill_count;
338
339 unsigned int tbuf_count;
340 struct slgt_desc *tbufs;
341 unsigned int tbuf_current;
342 unsigned int tbuf_start;
343
344 unsigned char *tmp_rbuf;
345 unsigned int tmp_rbuf_count;
346
347 /* SPPP/Cisco HDLC device parts */
348
349 int netcount;
350 spinlock_t netlock;
351 #if SYNCLINK_GENERIC_HDLC
352 struct net_device *netdev;
353 #endif
354
355 };
356
357 static MGSL_PARAMS default_params = {
358 .mode = MGSL_MODE_HDLC,
359 .loopback = 0,
360 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
361 .encoding = HDLC_ENCODING_NRZI_SPACE,
362 .clock_speed = 0,
363 .addr_filter = 0xff,
364 .crc_type = HDLC_CRC_16_CCITT,
365 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
366 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
367 .data_rate = 9600,
368 .data_bits = 8,
369 .stop_bits = 1,
370 .parity = ASYNC_PARITY_NONE
371 };
372
373
374 #define BH_RECEIVE 1
375 #define BH_TRANSMIT 2
376 #define BH_STATUS 4
377 #define IO_PIN_SHUTDOWN_LIMIT 100
378
379 #define DMABUFSIZE 256
380 #define DESC_LIST_SIZE 4096
381
382 #define MASK_PARITY BIT1
383 #define MASK_FRAMING BIT0
384 #define MASK_BREAK BIT14
385 #define MASK_OVERRUN BIT4
386
387 #define GSR 0x00 /* global status */
388 #define JCR 0x04 /* JTAG control */
389 #define IODR 0x08 /* GPIO direction */
390 #define IOER 0x0c /* GPIO interrupt enable */
391 #define IOVR 0x10 /* GPIO value */
392 #define IOSR 0x14 /* GPIO interrupt status */
393 #define TDR 0x80 /* tx data */
394 #define RDR 0x80 /* rx data */
395 #define TCR 0x82 /* tx control */
396 #define TIR 0x84 /* tx idle */
397 #define TPR 0x85 /* tx preamble */
398 #define RCR 0x86 /* rx control */
399 #define VCR 0x88 /* V.24 control */
400 #define CCR 0x89 /* clock control */
401 #define BDR 0x8a /* baud divisor */
402 #define SCR 0x8c /* serial control */
403 #define SSR 0x8e /* serial status */
404 #define RDCSR 0x90 /* rx DMA control/status */
405 #define TDCSR 0x94 /* tx DMA control/status */
406 #define RDDAR 0x98 /* rx DMA descriptor address */
407 #define TDDAR 0x9c /* tx DMA descriptor address */
408
409 #define RXIDLE BIT14
410 #define RXBREAK BIT14
411 #define IRQ_TXDATA BIT13
412 #define IRQ_TXIDLE BIT12
413 #define IRQ_TXUNDER BIT11 /* HDLC */
414 #define IRQ_RXDATA BIT10
415 #define IRQ_RXIDLE BIT9 /* HDLC */
416 #define IRQ_RXBREAK BIT9 /* async */
417 #define IRQ_RXOVER BIT8
418 #define IRQ_DSR BIT7
419 #define IRQ_CTS BIT6
420 #define IRQ_DCD BIT5
421 #define IRQ_RI BIT4
422 #define IRQ_ALL 0x3ff0
423 #define IRQ_MASTER BIT0
424
425 #define slgt_irq_on(info, mask) \
426 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
427 #define slgt_irq_off(info, mask) \
428 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
429
430 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
431 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
432 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
433 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
434 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
435 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
436
437 static void msc_set_vcr(struct slgt_info *info);
438
439 static int startup(struct slgt_info *info);
440 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
441 static void shutdown(struct slgt_info *info);
442 static void program_hw(struct slgt_info *info);
443 static void change_params(struct slgt_info *info);
444
445 static int register_test(struct slgt_info *info);
446 static int irq_test(struct slgt_info *info);
447 static int loopback_test(struct slgt_info *info);
448 static int adapter_test(struct slgt_info *info);
449
450 static void reset_adapter(struct slgt_info *info);
451 static void reset_port(struct slgt_info *info);
452 static void async_mode(struct slgt_info *info);
453 static void sync_mode(struct slgt_info *info);
454
455 static void rx_stop(struct slgt_info *info);
456 static void rx_start(struct slgt_info *info);
457 static void reset_rbufs(struct slgt_info *info);
458 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
459 static void rdma_reset(struct slgt_info *info);
460 static bool rx_get_frame(struct slgt_info *info);
461 static bool rx_get_buf(struct slgt_info *info);
462
463 static void tx_start(struct slgt_info *info);
464 static void tx_stop(struct slgt_info *info);
465 static void tx_set_idle(struct slgt_info *info);
466 static unsigned int free_tbuf_count(struct slgt_info *info);
467 static unsigned int tbuf_bytes(struct slgt_info *info);
468 static void reset_tbufs(struct slgt_info *info);
469 static void tdma_reset(struct slgt_info *info);
470 static void tdma_start(struct slgt_info *info);
471 static void tx_load(struct slgt_info *info, const char *buf, unsigned int count);
472
473 static void get_signals(struct slgt_info *info);
474 static void set_signals(struct slgt_info *info);
475 static void enable_loopback(struct slgt_info *info);
476 static void set_rate(struct slgt_info *info, u32 data_rate);
477
478 static int bh_action(struct slgt_info *info);
479 static void bh_handler(struct work_struct *work);
480 static void bh_transmit(struct slgt_info *info);
481 static void isr_serial(struct slgt_info *info);
482 static void isr_rdma(struct slgt_info *info);
483 static void isr_txeom(struct slgt_info *info, unsigned short status);
484 static void isr_tdma(struct slgt_info *info);
485
486 static int alloc_dma_bufs(struct slgt_info *info);
487 static void free_dma_bufs(struct slgt_info *info);
488 static int alloc_desc(struct slgt_info *info);
489 static void free_desc(struct slgt_info *info);
490 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
491 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
492
493 static int alloc_tmp_rbuf(struct slgt_info *info);
494 static void free_tmp_rbuf(struct slgt_info *info);
495
496 static void tx_timeout(unsigned long context);
497 static void rx_timeout(unsigned long context);
498
499 /*
500 * ioctl handlers
501 */
502 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
503 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
504 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
505 static int get_txidle(struct slgt_info *info, int __user *idle_mode);
506 static int set_txidle(struct slgt_info *info, int idle_mode);
507 static int tx_enable(struct slgt_info *info, int enable);
508 static int tx_abort(struct slgt_info *info);
509 static int rx_enable(struct slgt_info *info, int enable);
510 static int modem_input_wait(struct slgt_info *info,int arg);
511 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
512 static int tiocmget(struct tty_struct *tty, struct file *file);
513 static int tiocmset(struct tty_struct *tty, struct file *file,
514 unsigned int set, unsigned int clear);
515 static int set_break(struct tty_struct *tty, int break_state);
516 static int get_interface(struct slgt_info *info, int __user *if_mode);
517 static int set_interface(struct slgt_info *info, int if_mode);
518 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
519 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
520 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521
522 /*
523 * driver functions
524 */
525 static void add_device(struct slgt_info *info);
526 static void device_init(int adapter_num, struct pci_dev *pdev);
527 static int claim_resources(struct slgt_info *info);
528 static void release_resources(struct slgt_info *info);
529
530 /*
531 * DEBUG OUTPUT CODE
532 */
533 #ifndef DBGINFO
534 #define DBGINFO(fmt)
535 #endif
536 #ifndef DBGERR
537 #define DBGERR(fmt)
538 #endif
539 #ifndef DBGBH
540 #define DBGBH(fmt)
541 #endif
542 #ifndef DBGISR
543 #define DBGISR(fmt)
544 #endif
545
546 #ifdef DBGDATA
547 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
548 {
549 int i;
550 int linecount;
551 printk("%s %s data:\n",info->device_name, label);
552 while(count) {
553 linecount = (count > 16) ? 16 : count;
554 for(i=0; i < linecount; i++)
555 printk("%02X ",(unsigned char)data[i]);
556 for(;i<17;i++)
557 printk(" ");
558 for(i=0;i<linecount;i++) {
559 if (data[i]>=040 && data[i]<=0176)
560 printk("%c",data[i]);
561 else
562 printk(".");
563 }
564 printk("\n");
565 data += linecount;
566 count -= linecount;
567 }
568 }
569 #else
570 #define DBGDATA(info, buf, size, label)
571 #endif
572
573 #ifdef DBGTBUF
574 static void dump_tbufs(struct slgt_info *info)
575 {
576 int i;
577 printk("tbuf_current=%d\n", info->tbuf_current);
578 for (i=0 ; i < info->tbuf_count ; i++) {
579 printk("%d: count=%04X status=%04X\n",
580 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
581 }
582 }
583 #else
584 #define DBGTBUF(info)
585 #endif
586
587 #ifdef DBGRBUF
588 static void dump_rbufs(struct slgt_info *info)
589 {
590 int i;
591 printk("rbuf_current=%d\n", info->rbuf_current);
592 for (i=0 ; i < info->rbuf_count ; i++) {
593 printk("%d: count=%04X status=%04X\n",
594 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
595 }
596 }
597 #else
598 #define DBGRBUF(info)
599 #endif
600
601 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
602 {
603 #ifdef SANITY_CHECK
604 if (!info) {
605 printk("null struct slgt_info for (%s) in %s\n", devname, name);
606 return 1;
607 }
608 if (info->magic != MGSL_MAGIC) {
609 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
610 return 1;
611 }
612 #else
613 if (!info)
614 return 1;
615 #endif
616 return 0;
617 }
618
619 /**
620 * line discipline callback wrappers
621 *
622 * The wrappers maintain line discipline references
623 * while calling into the line discipline.
624 *
625 * ldisc_receive_buf - pass receive data to line discipline
626 */
627 static void ldisc_receive_buf(struct tty_struct *tty,
628 const __u8 *data, char *flags, int count)
629 {
630 struct tty_ldisc *ld;
631 if (!tty)
632 return;
633 ld = tty_ldisc_ref(tty);
634 if (ld) {
635 if (ld->ops->receive_buf)
636 ld->ops->receive_buf(tty, data, flags, count);
637 tty_ldisc_deref(ld);
638 }
639 }
640
641 /* tty callbacks */
642
643 static int open(struct tty_struct *tty, struct file *filp)
644 {
645 struct slgt_info *info;
646 int retval, line;
647 unsigned long flags;
648
649 line = tty->index;
650 if ((line < 0) || (line >= slgt_device_count)) {
651 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
652 return -ENODEV;
653 }
654
655 info = slgt_device_list;
656 while(info && info->line != line)
657 info = info->next_device;
658 if (sanity_check(info, tty->name, "open"))
659 return -ENODEV;
660 if (info->init_error) {
661 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
662 return -ENODEV;
663 }
664
665 tty->driver_data = info;
666 info->port.tty = tty;
667
668 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
669
670 /* If port is closing, signal caller to try again */
671 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
672 if (info->port.flags & ASYNC_CLOSING)
673 interruptible_sleep_on(&info->port.close_wait);
674 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
675 -EAGAIN : -ERESTARTSYS);
676 goto cleanup;
677 }
678
679 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
680
681 spin_lock_irqsave(&info->netlock, flags);
682 if (info->netcount) {
683 retval = -EBUSY;
684 spin_unlock_irqrestore(&info->netlock, flags);
685 goto cleanup;
686 }
687 info->port.count++;
688 spin_unlock_irqrestore(&info->netlock, flags);
689
690 if (info->port.count == 1) {
691 /* 1st open on this device, init hardware */
692 retval = startup(info);
693 if (retval < 0)
694 goto cleanup;
695 }
696
697 retval = block_til_ready(tty, filp, info);
698 if (retval) {
699 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
700 goto cleanup;
701 }
702
703 retval = 0;
704
705 cleanup:
706 if (retval) {
707 if (tty->count == 1)
708 info->port.tty = NULL; /* tty layer will release tty struct */
709 if(info->port.count)
710 info->port.count--;
711 }
712
713 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
714 return retval;
715 }
716
717 static void close(struct tty_struct *tty, struct file *filp)
718 {
719 struct slgt_info *info = tty->driver_data;
720
721 if (sanity_check(info, tty->name, "close"))
722 return;
723 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
724
725 if (tty_port_close_start(&info->port, tty, filp) == 0)
726 goto cleanup;
727
728 if (info->port.flags & ASYNC_INITIALIZED)
729 wait_until_sent(tty, info->timeout);
730 flush_buffer(tty);
731 tty_ldisc_flush(tty);
732
733 shutdown(info);
734
735 tty_port_close_end(&info->port, tty);
736 info->port.tty = NULL;
737 cleanup:
738 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
739 }
740
741 static void hangup(struct tty_struct *tty)
742 {
743 struct slgt_info *info = tty->driver_data;
744
745 if (sanity_check(info, tty->name, "hangup"))
746 return;
747 DBGINFO(("%s hangup\n", info->device_name));
748
749 flush_buffer(tty);
750 shutdown(info);
751
752 info->port.count = 0;
753 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
754 info->port.tty = NULL;
755
756 wake_up_interruptible(&info->port.open_wait);
757 }
758
759 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
760 {
761 struct slgt_info *info = tty->driver_data;
762 unsigned long flags;
763
764 DBGINFO(("%s set_termios\n", tty->driver->name));
765
766 change_params(info);
767
768 /* Handle transition to B0 status */
769 if (old_termios->c_cflag & CBAUD &&
770 !(tty->termios->c_cflag & CBAUD)) {
771 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
772 spin_lock_irqsave(&info->lock,flags);
773 set_signals(info);
774 spin_unlock_irqrestore(&info->lock,flags);
775 }
776
777 /* Handle transition away from B0 status */
778 if (!(old_termios->c_cflag & CBAUD) &&
779 tty->termios->c_cflag & CBAUD) {
780 info->signals |= SerialSignal_DTR;
781 if (!(tty->termios->c_cflag & CRTSCTS) ||
782 !test_bit(TTY_THROTTLED, &tty->flags)) {
783 info->signals |= SerialSignal_RTS;
784 }
785 spin_lock_irqsave(&info->lock,flags);
786 set_signals(info);
787 spin_unlock_irqrestore(&info->lock,flags);
788 }
789
790 /* Handle turning off CRTSCTS */
791 if (old_termios->c_cflag & CRTSCTS &&
792 !(tty->termios->c_cflag & CRTSCTS)) {
793 tty->hw_stopped = 0;
794 tx_release(tty);
795 }
796 }
797
798 static int write(struct tty_struct *tty,
799 const unsigned char *buf, int count)
800 {
801 int ret = 0;
802 struct slgt_info *info = tty->driver_data;
803 unsigned long flags;
804 unsigned int bufs_needed;
805
806 if (sanity_check(info, tty->name, "write"))
807 goto cleanup;
808 DBGINFO(("%s write count=%d\n", info->device_name, count));
809
810 if (!info->tx_buf)
811 goto cleanup;
812
813 if (count > info->max_frame_size) {
814 ret = -EIO;
815 goto cleanup;
816 }
817
818 if (!count)
819 goto cleanup;
820
821 if (!info->tx_active && info->tx_count) {
822 /* send accumulated data from send_char() */
823 tx_load(info, info->tx_buf, info->tx_count);
824 goto start;
825 }
826 bufs_needed = (count/DMABUFSIZE);
827 if (count % DMABUFSIZE)
828 ++bufs_needed;
829 if (bufs_needed > free_tbuf_count(info))
830 goto cleanup;
831
832 ret = info->tx_count = count;
833 tx_load(info, buf, count);
834 goto start;
835
836 start:
837 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
838 spin_lock_irqsave(&info->lock,flags);
839 if (!info->tx_active)
840 tx_start(info);
841 else
842 tdma_start(info);
843 spin_unlock_irqrestore(&info->lock,flags);
844 }
845
846 cleanup:
847 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
848 return ret;
849 }
850
851 static int put_char(struct tty_struct *tty, unsigned char ch)
852 {
853 struct slgt_info *info = tty->driver_data;
854 unsigned long flags;
855 int ret = 0;
856
857 if (sanity_check(info, tty->name, "put_char"))
858 return 0;
859 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
860 if (!info->tx_buf)
861 return 0;
862 spin_lock_irqsave(&info->lock,flags);
863 if (!info->tx_active && (info->tx_count < info->max_frame_size)) {
864 info->tx_buf[info->tx_count++] = ch;
865 ret = 1;
866 }
867 spin_unlock_irqrestore(&info->lock,flags);
868 return ret;
869 }
870
871 static void send_xchar(struct tty_struct *tty, char ch)
872 {
873 struct slgt_info *info = tty->driver_data;
874 unsigned long flags;
875
876 if (sanity_check(info, tty->name, "send_xchar"))
877 return;
878 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
879 info->x_char = ch;
880 if (ch) {
881 spin_lock_irqsave(&info->lock,flags);
882 if (!info->tx_enabled)
883 tx_start(info);
884 spin_unlock_irqrestore(&info->lock,flags);
885 }
886 }
887
888 static void wait_until_sent(struct tty_struct *tty, int timeout)
889 {
890 struct slgt_info *info = tty->driver_data;
891 unsigned long orig_jiffies, char_time;
892
893 if (!info )
894 return;
895 if (sanity_check(info, tty->name, "wait_until_sent"))
896 return;
897 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
898 if (!(info->port.flags & ASYNC_INITIALIZED))
899 goto exit;
900
901 orig_jiffies = jiffies;
902
903 /* Set check interval to 1/5 of estimated time to
904 * send a character, and make it at least 1. The check
905 * interval should also be less than the timeout.
906 * Note: use tight timings here to satisfy the NIST-PCTS.
907 */
908
909 lock_kernel();
910
911 if (info->params.data_rate) {
912 char_time = info->timeout/(32 * 5);
913 if (!char_time)
914 char_time++;
915 } else
916 char_time = 1;
917
918 if (timeout)
919 char_time = min_t(unsigned long, char_time, timeout);
920
921 while (info->tx_active) {
922 msleep_interruptible(jiffies_to_msecs(char_time));
923 if (signal_pending(current))
924 break;
925 if (timeout && time_after(jiffies, orig_jiffies + timeout))
926 break;
927 }
928 unlock_kernel();
929
930 exit:
931 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
932 }
933
934 static int write_room(struct tty_struct *tty)
935 {
936 struct slgt_info *info = tty->driver_data;
937 int ret;
938
939 if (sanity_check(info, tty->name, "write_room"))
940 return 0;
941 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
942 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
943 return ret;
944 }
945
946 static void flush_chars(struct tty_struct *tty)
947 {
948 struct slgt_info *info = tty->driver_data;
949 unsigned long flags;
950
951 if (sanity_check(info, tty->name, "flush_chars"))
952 return;
953 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
954
955 if (info->tx_count <= 0 || tty->stopped ||
956 tty->hw_stopped || !info->tx_buf)
957 return;
958
959 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
960
961 spin_lock_irqsave(&info->lock,flags);
962 if (!info->tx_active && info->tx_count) {
963 tx_load(info, info->tx_buf,info->tx_count);
964 tx_start(info);
965 }
966 spin_unlock_irqrestore(&info->lock,flags);
967 }
968
969 static void flush_buffer(struct tty_struct *tty)
970 {
971 struct slgt_info *info = tty->driver_data;
972 unsigned long flags;
973
974 if (sanity_check(info, tty->name, "flush_buffer"))
975 return;
976 DBGINFO(("%s flush_buffer\n", info->device_name));
977
978 spin_lock_irqsave(&info->lock,flags);
979 if (!info->tx_active)
980 info->tx_count = 0;
981 spin_unlock_irqrestore(&info->lock,flags);
982
983 tty_wakeup(tty);
984 }
985
986 /*
987 * throttle (stop) transmitter
988 */
989 static void tx_hold(struct tty_struct *tty)
990 {
991 struct slgt_info *info = tty->driver_data;
992 unsigned long flags;
993
994 if (sanity_check(info, tty->name, "tx_hold"))
995 return;
996 DBGINFO(("%s tx_hold\n", info->device_name));
997 spin_lock_irqsave(&info->lock,flags);
998 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
999 tx_stop(info);
1000 spin_unlock_irqrestore(&info->lock,flags);
1001 }
1002
1003 /*
1004 * release (start) transmitter
1005 */
1006 static void tx_release(struct tty_struct *tty)
1007 {
1008 struct slgt_info *info = tty->driver_data;
1009 unsigned long flags;
1010
1011 if (sanity_check(info, tty->name, "tx_release"))
1012 return;
1013 DBGINFO(("%s tx_release\n", info->device_name));
1014 spin_lock_irqsave(&info->lock,flags);
1015 if (!info->tx_active && info->tx_count) {
1016 tx_load(info, info->tx_buf, info->tx_count);
1017 tx_start(info);
1018 }
1019 spin_unlock_irqrestore(&info->lock,flags);
1020 }
1021
1022 /*
1023 * Service an IOCTL request
1024 *
1025 * Arguments
1026 *
1027 * tty pointer to tty instance data
1028 * file pointer to associated file object for device
1029 * cmd IOCTL command code
1030 * arg command argument/context
1031 *
1032 * Return 0 if success, otherwise error code
1033 */
1034 static int ioctl(struct tty_struct *tty, struct file *file,
1035 unsigned int cmd, unsigned long arg)
1036 {
1037 struct slgt_info *info = tty->driver_data;
1038 struct mgsl_icount cnow; /* kernel counter temps */
1039 struct serial_icounter_struct __user *p_cuser; /* user space */
1040 unsigned long flags;
1041 void __user *argp = (void __user *)arg;
1042 int ret;
1043
1044 if (sanity_check(info, tty->name, "ioctl"))
1045 return -ENODEV;
1046 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1047
1048 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1049 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1050 if (tty->flags & (1 << TTY_IO_ERROR))
1051 return -EIO;
1052 }
1053
1054 lock_kernel();
1055
1056 switch (cmd) {
1057 case MGSL_IOCGPARAMS:
1058 ret = get_params(info, argp);
1059 break;
1060 case MGSL_IOCSPARAMS:
1061 ret = set_params(info, argp);
1062 break;
1063 case MGSL_IOCGTXIDLE:
1064 ret = get_txidle(info, argp);
1065 break;
1066 case MGSL_IOCSTXIDLE:
1067 ret = set_txidle(info, (int)arg);
1068 break;
1069 case MGSL_IOCTXENABLE:
1070 ret = tx_enable(info, (int)arg);
1071 break;
1072 case MGSL_IOCRXENABLE:
1073 ret = rx_enable(info, (int)arg);
1074 break;
1075 case MGSL_IOCTXABORT:
1076 ret = tx_abort(info);
1077 break;
1078 case MGSL_IOCGSTATS:
1079 ret = get_stats(info, argp);
1080 break;
1081 case MGSL_IOCWAITEVENT:
1082 ret = wait_mgsl_event(info, argp);
1083 break;
1084 case TIOCMIWAIT:
1085 ret = modem_input_wait(info,(int)arg);
1086 break;
1087 case MGSL_IOCGIF:
1088 ret = get_interface(info, argp);
1089 break;
1090 case MGSL_IOCSIF:
1091 ret = set_interface(info,(int)arg);
1092 break;
1093 case MGSL_IOCSGPIO:
1094 ret = set_gpio(info, argp);
1095 break;
1096 case MGSL_IOCGGPIO:
1097 ret = get_gpio(info, argp);
1098 break;
1099 case MGSL_IOCWAITGPIO:
1100 ret = wait_gpio(info, argp);
1101 break;
1102 case TIOCGICOUNT:
1103 spin_lock_irqsave(&info->lock,flags);
1104 cnow = info->icount;
1105 spin_unlock_irqrestore(&info->lock,flags);
1106 p_cuser = argp;
1107 if (put_user(cnow.cts, &p_cuser->cts) ||
1108 put_user(cnow.dsr, &p_cuser->dsr) ||
1109 put_user(cnow.rng, &p_cuser->rng) ||
1110 put_user(cnow.dcd, &p_cuser->dcd) ||
1111 put_user(cnow.rx, &p_cuser->rx) ||
1112 put_user(cnow.tx, &p_cuser->tx) ||
1113 put_user(cnow.frame, &p_cuser->frame) ||
1114 put_user(cnow.overrun, &p_cuser->overrun) ||
1115 put_user(cnow.parity, &p_cuser->parity) ||
1116 put_user(cnow.brk, &p_cuser->brk) ||
1117 put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
1118 ret = -EFAULT;
1119 ret = 0;
1120 break;
1121 default:
1122 ret = -ENOIOCTLCMD;
1123 }
1124 unlock_kernel();
1125 return ret;
1126 }
1127
1128 /*
1129 * support for 32 bit ioctl calls on 64 bit systems
1130 */
1131 #ifdef CONFIG_COMPAT
1132 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1133 {
1134 struct MGSL_PARAMS32 tmp_params;
1135
1136 DBGINFO(("%s get_params32\n", info->device_name));
1137 tmp_params.mode = (compat_ulong_t)info->params.mode;
1138 tmp_params.loopback = info->params.loopback;
1139 tmp_params.flags = info->params.flags;
1140 tmp_params.encoding = info->params.encoding;
1141 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1142 tmp_params.addr_filter = info->params.addr_filter;
1143 tmp_params.crc_type = info->params.crc_type;
1144 tmp_params.preamble_length = info->params.preamble_length;
1145 tmp_params.preamble = info->params.preamble;
1146 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1147 tmp_params.data_bits = info->params.data_bits;
1148 tmp_params.stop_bits = info->params.stop_bits;
1149 tmp_params.parity = info->params.parity;
1150 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1151 return -EFAULT;
1152 return 0;
1153 }
1154
1155 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1156 {
1157 struct MGSL_PARAMS32 tmp_params;
1158
1159 DBGINFO(("%s set_params32\n", info->device_name));
1160 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1161 return -EFAULT;
1162
1163 spin_lock(&info->lock);
1164 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1165 info->base_clock = tmp_params.clock_speed;
1166 } else {
1167 info->params.mode = tmp_params.mode;
1168 info->params.loopback = tmp_params.loopback;
1169 info->params.flags = tmp_params.flags;
1170 info->params.encoding = tmp_params.encoding;
1171 info->params.clock_speed = tmp_params.clock_speed;
1172 info->params.addr_filter = tmp_params.addr_filter;
1173 info->params.crc_type = tmp_params.crc_type;
1174 info->params.preamble_length = tmp_params.preamble_length;
1175 info->params.preamble = tmp_params.preamble;
1176 info->params.data_rate = tmp_params.data_rate;
1177 info->params.data_bits = tmp_params.data_bits;
1178 info->params.stop_bits = tmp_params.stop_bits;
1179 info->params.parity = tmp_params.parity;
1180 }
1181 spin_unlock(&info->lock);
1182
1183 program_hw(info);
1184
1185 return 0;
1186 }
1187
1188 static long slgt_compat_ioctl(struct tty_struct *tty, struct file *file,
1189 unsigned int cmd, unsigned long arg)
1190 {
1191 struct slgt_info *info = tty->driver_data;
1192 int rc = -ENOIOCTLCMD;
1193
1194 if (sanity_check(info, tty->name, "compat_ioctl"))
1195 return -ENODEV;
1196 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1197
1198 switch (cmd) {
1199
1200 case MGSL_IOCSPARAMS32:
1201 rc = set_params32(info, compat_ptr(arg));
1202 break;
1203
1204 case MGSL_IOCGPARAMS32:
1205 rc = get_params32(info, compat_ptr(arg));
1206 break;
1207
1208 case MGSL_IOCGPARAMS:
1209 case MGSL_IOCSPARAMS:
1210 case MGSL_IOCGTXIDLE:
1211 case MGSL_IOCGSTATS:
1212 case MGSL_IOCWAITEVENT:
1213 case MGSL_IOCGIF:
1214 case MGSL_IOCSGPIO:
1215 case MGSL_IOCGGPIO:
1216 case MGSL_IOCWAITGPIO:
1217 case TIOCGICOUNT:
1218 rc = ioctl(tty, file, cmd, (unsigned long)(compat_ptr(arg)));
1219 break;
1220
1221 case MGSL_IOCSTXIDLE:
1222 case MGSL_IOCTXENABLE:
1223 case MGSL_IOCRXENABLE:
1224 case MGSL_IOCTXABORT:
1225 case TIOCMIWAIT:
1226 case MGSL_IOCSIF:
1227 rc = ioctl(tty, file, cmd, arg);
1228 break;
1229 }
1230
1231 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1232 return rc;
1233 }
1234 #else
1235 #define slgt_compat_ioctl NULL
1236 #endif /* ifdef CONFIG_COMPAT */
1237
1238 /*
1239 * proc fs support
1240 */
1241 static inline void line_info(struct seq_file *m, struct slgt_info *info)
1242 {
1243 char stat_buf[30];
1244 unsigned long flags;
1245
1246 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1247 info->device_name, info->phys_reg_addr,
1248 info->irq_level, info->max_frame_size);
1249
1250 /* output current serial signal states */
1251 spin_lock_irqsave(&info->lock,flags);
1252 get_signals(info);
1253 spin_unlock_irqrestore(&info->lock,flags);
1254
1255 stat_buf[0] = 0;
1256 stat_buf[1] = 0;
1257 if (info->signals & SerialSignal_RTS)
1258 strcat(stat_buf, "|RTS");
1259 if (info->signals & SerialSignal_CTS)
1260 strcat(stat_buf, "|CTS");
1261 if (info->signals & SerialSignal_DTR)
1262 strcat(stat_buf, "|DTR");
1263 if (info->signals & SerialSignal_DSR)
1264 strcat(stat_buf, "|DSR");
1265 if (info->signals & SerialSignal_DCD)
1266 strcat(stat_buf, "|CD");
1267 if (info->signals & SerialSignal_RI)
1268 strcat(stat_buf, "|RI");
1269
1270 if (info->params.mode != MGSL_MODE_ASYNC) {
1271 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1272 info->icount.txok, info->icount.rxok);
1273 if (info->icount.txunder)
1274 seq_printf(m, " txunder:%d", info->icount.txunder);
1275 if (info->icount.txabort)
1276 seq_printf(m, " txabort:%d", info->icount.txabort);
1277 if (info->icount.rxshort)
1278 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1279 if (info->icount.rxlong)
1280 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1281 if (info->icount.rxover)
1282 seq_printf(m, " rxover:%d", info->icount.rxover);
1283 if (info->icount.rxcrc)
1284 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1285 } else {
1286 seq_printf(m, "\tASYNC tx:%d rx:%d",
1287 info->icount.tx, info->icount.rx);
1288 if (info->icount.frame)
1289 seq_printf(m, " fe:%d", info->icount.frame);
1290 if (info->icount.parity)
1291 seq_printf(m, " pe:%d", info->icount.parity);
1292 if (info->icount.brk)
1293 seq_printf(m, " brk:%d", info->icount.brk);
1294 if (info->icount.overrun)
1295 seq_printf(m, " oe:%d", info->icount.overrun);
1296 }
1297
1298 /* Append serial signal status to end */
1299 seq_printf(m, " %s\n", stat_buf+1);
1300
1301 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1302 info->tx_active,info->bh_requested,info->bh_running,
1303 info->pending_bh);
1304 }
1305
1306 /* Called to print information about devices
1307 */
1308 static int synclink_gt_proc_show(struct seq_file *m, void *v)
1309 {
1310 struct slgt_info *info;
1311
1312 seq_puts(m, "synclink_gt driver\n");
1313
1314 info = slgt_device_list;
1315 while( info ) {
1316 line_info(m, info);
1317 info = info->next_device;
1318 }
1319 return 0;
1320 }
1321
1322 static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1323 {
1324 return single_open(file, synclink_gt_proc_show, NULL);
1325 }
1326
1327 static const struct file_operations synclink_gt_proc_fops = {
1328 .owner = THIS_MODULE,
1329 .open = synclink_gt_proc_open,
1330 .read = seq_read,
1331 .llseek = seq_lseek,
1332 .release = single_release,
1333 };
1334
1335 /*
1336 * return count of bytes in transmit buffer
1337 */
1338 static int chars_in_buffer(struct tty_struct *tty)
1339 {
1340 struct slgt_info *info = tty->driver_data;
1341 int count;
1342 if (sanity_check(info, tty->name, "chars_in_buffer"))
1343 return 0;
1344 count = tbuf_bytes(info);
1345 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1346 return count;
1347 }
1348
1349 /*
1350 * signal remote device to throttle send data (our receive data)
1351 */
1352 static void throttle(struct tty_struct * tty)
1353 {
1354 struct slgt_info *info = tty->driver_data;
1355 unsigned long flags;
1356
1357 if (sanity_check(info, tty->name, "throttle"))
1358 return;
1359 DBGINFO(("%s throttle\n", info->device_name));
1360 if (I_IXOFF(tty))
1361 send_xchar(tty, STOP_CHAR(tty));
1362 if (tty->termios->c_cflag & CRTSCTS) {
1363 spin_lock_irqsave(&info->lock,flags);
1364 info->signals &= ~SerialSignal_RTS;
1365 set_signals(info);
1366 spin_unlock_irqrestore(&info->lock,flags);
1367 }
1368 }
1369
1370 /*
1371 * signal remote device to stop throttling send data (our receive data)
1372 */
1373 static void unthrottle(struct tty_struct * tty)
1374 {
1375 struct slgt_info *info = tty->driver_data;
1376 unsigned long flags;
1377
1378 if (sanity_check(info, tty->name, "unthrottle"))
1379 return;
1380 DBGINFO(("%s unthrottle\n", info->device_name));
1381 if (I_IXOFF(tty)) {
1382 if (info->x_char)
1383 info->x_char = 0;
1384 else
1385 send_xchar(tty, START_CHAR(tty));
1386 }
1387 if (tty->termios->c_cflag & CRTSCTS) {
1388 spin_lock_irqsave(&info->lock,flags);
1389 info->signals |= SerialSignal_RTS;
1390 set_signals(info);
1391 spin_unlock_irqrestore(&info->lock,flags);
1392 }
1393 }
1394
1395 /*
1396 * set or clear transmit break condition
1397 * break_state -1=set break condition, 0=clear
1398 */
1399 static int set_break(struct tty_struct *tty, int break_state)
1400 {
1401 struct slgt_info *info = tty->driver_data;
1402 unsigned short value;
1403 unsigned long flags;
1404
1405 if (sanity_check(info, tty->name, "set_break"))
1406 return -EINVAL;
1407 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1408
1409 spin_lock_irqsave(&info->lock,flags);
1410 value = rd_reg16(info, TCR);
1411 if (break_state == -1)
1412 value |= BIT6;
1413 else
1414 value &= ~BIT6;
1415 wr_reg16(info, TCR, value);
1416 spin_unlock_irqrestore(&info->lock,flags);
1417 return 0;
1418 }
1419
1420 #if SYNCLINK_GENERIC_HDLC
1421
1422 /**
1423 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1424 * set encoding and frame check sequence (FCS) options
1425 *
1426 * dev pointer to network device structure
1427 * encoding serial encoding setting
1428 * parity FCS setting
1429 *
1430 * returns 0 if success, otherwise error code
1431 */
1432 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1433 unsigned short parity)
1434 {
1435 struct slgt_info *info = dev_to_port(dev);
1436 unsigned char new_encoding;
1437 unsigned short new_crctype;
1438
1439 /* return error if TTY interface open */
1440 if (info->port.count)
1441 return -EBUSY;
1442
1443 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1444
1445 switch (encoding)
1446 {
1447 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1448 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1449 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1450 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1451 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1452 default: return -EINVAL;
1453 }
1454
1455 switch (parity)
1456 {
1457 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1458 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1459 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1460 default: return -EINVAL;
1461 }
1462
1463 info->params.encoding = new_encoding;
1464 info->params.crc_type = new_crctype;
1465
1466 /* if network interface up, reprogram hardware */
1467 if (info->netcount)
1468 program_hw(info);
1469
1470 return 0;
1471 }
1472
1473 /**
1474 * called by generic HDLC layer to send frame
1475 *
1476 * skb socket buffer containing HDLC frame
1477 * dev pointer to network device structure
1478 *
1479 * returns 0 if success, otherwise error code
1480 */
1481 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1482 {
1483 struct slgt_info *info = dev_to_port(dev);
1484 unsigned long flags;
1485
1486 DBGINFO(("%s hdlc_xmit\n", dev->name));
1487
1488 /* stop sending until this frame completes */
1489 netif_stop_queue(dev);
1490
1491 /* copy data to device buffers */
1492 info->tx_count = skb->len;
1493 tx_load(info, skb->data, skb->len);
1494
1495 /* update network statistics */
1496 dev->stats.tx_packets++;
1497 dev->stats.tx_bytes += skb->len;
1498
1499 /* done with socket buffer, so free it */
1500 dev_kfree_skb(skb);
1501
1502 /* save start time for transmit timeout detection */
1503 dev->trans_start = jiffies;
1504
1505 /* start hardware transmitter if necessary */
1506 spin_lock_irqsave(&info->lock,flags);
1507 if (!info->tx_active)
1508 tx_start(info);
1509 spin_unlock_irqrestore(&info->lock,flags);
1510
1511 return 0;
1512 }
1513
1514 /**
1515 * called by network layer when interface enabled
1516 * claim resources and initialize hardware
1517 *
1518 * dev pointer to network device structure
1519 *
1520 * returns 0 if success, otherwise error code
1521 */
1522 static int hdlcdev_open(struct net_device *dev)
1523 {
1524 struct slgt_info *info = dev_to_port(dev);
1525 int rc;
1526 unsigned long flags;
1527
1528 if (!try_module_get(THIS_MODULE))
1529 return -EBUSY;
1530
1531 DBGINFO(("%s hdlcdev_open\n", dev->name));
1532
1533 /* generic HDLC layer open processing */
1534 if ((rc = hdlc_open(dev)))
1535 return rc;
1536
1537 /* arbitrate between network and tty opens */
1538 spin_lock_irqsave(&info->netlock, flags);
1539 if (info->port.count != 0 || info->netcount != 0) {
1540 DBGINFO(("%s hdlc_open busy\n", dev->name));
1541 spin_unlock_irqrestore(&info->netlock, flags);
1542 return -EBUSY;
1543 }
1544 info->netcount=1;
1545 spin_unlock_irqrestore(&info->netlock, flags);
1546
1547 /* claim resources and init adapter */
1548 if ((rc = startup(info)) != 0) {
1549 spin_lock_irqsave(&info->netlock, flags);
1550 info->netcount=0;
1551 spin_unlock_irqrestore(&info->netlock, flags);
1552 return rc;
1553 }
1554
1555 /* assert DTR and RTS, apply hardware settings */
1556 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
1557 program_hw(info);
1558
1559 /* enable network layer transmit */
1560 dev->trans_start = jiffies;
1561 netif_start_queue(dev);
1562
1563 /* inform generic HDLC layer of current DCD status */
1564 spin_lock_irqsave(&info->lock, flags);
1565 get_signals(info);
1566 spin_unlock_irqrestore(&info->lock, flags);
1567 if (info->signals & SerialSignal_DCD)
1568 netif_carrier_on(dev);
1569 else
1570 netif_carrier_off(dev);
1571 return 0;
1572 }
1573
1574 /**
1575 * called by network layer when interface is disabled
1576 * shutdown hardware and release resources
1577 *
1578 * dev pointer to network device structure
1579 *
1580 * returns 0 if success, otherwise error code
1581 */
1582 static int hdlcdev_close(struct net_device *dev)
1583 {
1584 struct slgt_info *info = dev_to_port(dev);
1585 unsigned long flags;
1586
1587 DBGINFO(("%s hdlcdev_close\n", dev->name));
1588
1589 netif_stop_queue(dev);
1590
1591 /* shutdown adapter and release resources */
1592 shutdown(info);
1593
1594 hdlc_close(dev);
1595
1596 spin_lock_irqsave(&info->netlock, flags);
1597 info->netcount=0;
1598 spin_unlock_irqrestore(&info->netlock, flags);
1599
1600 module_put(THIS_MODULE);
1601 return 0;
1602 }
1603
1604 /**
1605 * called by network layer to process IOCTL call to network device
1606 *
1607 * dev pointer to network device structure
1608 * ifr pointer to network interface request structure
1609 * cmd IOCTL command code
1610 *
1611 * returns 0 if success, otherwise error code
1612 */
1613 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1614 {
1615 const size_t size = sizeof(sync_serial_settings);
1616 sync_serial_settings new_line;
1617 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1618 struct slgt_info *info = dev_to_port(dev);
1619 unsigned int flags;
1620
1621 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1622
1623 /* return error if TTY interface open */
1624 if (info->port.count)
1625 return -EBUSY;
1626
1627 if (cmd != SIOCWANDEV)
1628 return hdlc_ioctl(dev, ifr, cmd);
1629
1630 switch(ifr->ifr_settings.type) {
1631 case IF_GET_IFACE: /* return current sync_serial_settings */
1632
1633 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1634 if (ifr->ifr_settings.size < size) {
1635 ifr->ifr_settings.size = size; /* data size wanted */
1636 return -ENOBUFS;
1637 }
1638
1639 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1640 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1641 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1642 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1643
1644 switch (flags){
1645 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1646 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1647 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1648 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1649 default: new_line.clock_type = CLOCK_DEFAULT;
1650 }
1651
1652 new_line.clock_rate = info->params.clock_speed;
1653 new_line.loopback = info->params.loopback ? 1:0;
1654
1655 if (copy_to_user(line, &new_line, size))
1656 return -EFAULT;
1657 return 0;
1658
1659 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1660
1661 if(!capable(CAP_NET_ADMIN))
1662 return -EPERM;
1663 if (copy_from_user(&new_line, line, size))
1664 return -EFAULT;
1665
1666 switch (new_line.clock_type)
1667 {
1668 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1669 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1670 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1671 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1672 case CLOCK_DEFAULT: flags = info->params.flags &
1673 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1674 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1675 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1676 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1677 default: return -EINVAL;
1678 }
1679
1680 if (new_line.loopback != 0 && new_line.loopback != 1)
1681 return -EINVAL;
1682
1683 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1684 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1685 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1686 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1687 info->params.flags |= flags;
1688
1689 info->params.loopback = new_line.loopback;
1690
1691 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1692 info->params.clock_speed = new_line.clock_rate;
1693 else
1694 info->params.clock_speed = 0;
1695
1696 /* if network interface up, reprogram hardware */
1697 if (info->netcount)
1698 program_hw(info);
1699 return 0;
1700
1701 default:
1702 return hdlc_ioctl(dev, ifr, cmd);
1703 }
1704 }
1705
1706 /**
1707 * called by network layer when transmit timeout is detected
1708 *
1709 * dev pointer to network device structure
1710 */
1711 static void hdlcdev_tx_timeout(struct net_device *dev)
1712 {
1713 struct slgt_info *info = dev_to_port(dev);
1714 unsigned long flags;
1715
1716 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1717
1718 dev->stats.tx_errors++;
1719 dev->stats.tx_aborted_errors++;
1720
1721 spin_lock_irqsave(&info->lock,flags);
1722 tx_stop(info);
1723 spin_unlock_irqrestore(&info->lock,flags);
1724
1725 netif_wake_queue(dev);
1726 }
1727
1728 /**
1729 * called by device driver when transmit completes
1730 * reenable network layer transmit if stopped
1731 *
1732 * info pointer to device instance information
1733 */
1734 static void hdlcdev_tx_done(struct slgt_info *info)
1735 {
1736 if (netif_queue_stopped(info->netdev))
1737 netif_wake_queue(info->netdev);
1738 }
1739
1740 /**
1741 * called by device driver when frame received
1742 * pass frame to network layer
1743 *
1744 * info pointer to device instance information
1745 * buf pointer to buffer contianing frame data
1746 * size count of data bytes in buf
1747 */
1748 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1749 {
1750 struct sk_buff *skb = dev_alloc_skb(size);
1751 struct net_device *dev = info->netdev;
1752
1753 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1754
1755 if (skb == NULL) {
1756 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1757 dev->stats.rx_dropped++;
1758 return;
1759 }
1760
1761 memcpy(skb_put(skb, size), buf, size);
1762
1763 skb->protocol = hdlc_type_trans(skb, dev);
1764
1765 dev->stats.rx_packets++;
1766 dev->stats.rx_bytes += size;
1767
1768 netif_rx(skb);
1769 }
1770
1771 static const struct net_device_ops hdlcdev_ops = {
1772 .ndo_open = hdlcdev_open,
1773 .ndo_stop = hdlcdev_close,
1774 .ndo_change_mtu = hdlc_change_mtu,
1775 .ndo_start_xmit = hdlc_start_xmit,
1776 .ndo_do_ioctl = hdlcdev_ioctl,
1777 .ndo_tx_timeout = hdlcdev_tx_timeout,
1778 };
1779
1780 /**
1781 * called by device driver when adding device instance
1782 * do generic HDLC initialization
1783 *
1784 * info pointer to device instance information
1785 *
1786 * returns 0 if success, otherwise error code
1787 */
1788 static int hdlcdev_init(struct slgt_info *info)
1789 {
1790 int rc;
1791 struct net_device *dev;
1792 hdlc_device *hdlc;
1793
1794 /* allocate and initialize network and HDLC layer objects */
1795
1796 if (!(dev = alloc_hdlcdev(info))) {
1797 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1798 return -ENOMEM;
1799 }
1800
1801 /* for network layer reporting purposes only */
1802 dev->mem_start = info->phys_reg_addr;
1803 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1804 dev->irq = info->irq_level;
1805
1806 /* network layer callbacks and settings */
1807 dev->netdev_ops = &hdlcdev_ops;
1808 dev->watchdog_timeo = 10 * HZ;
1809 dev->tx_queue_len = 50;
1810
1811 /* generic HDLC layer callbacks and settings */
1812 hdlc = dev_to_hdlc(dev);
1813 hdlc->attach = hdlcdev_attach;
1814 hdlc->xmit = hdlcdev_xmit;
1815
1816 /* register objects with HDLC layer */
1817 if ((rc = register_hdlc_device(dev))) {
1818 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1819 free_netdev(dev);
1820 return rc;
1821 }
1822
1823 info->netdev = dev;
1824 return 0;
1825 }
1826
1827 /**
1828 * called by device driver when removing device instance
1829 * do generic HDLC cleanup
1830 *
1831 * info pointer to device instance information
1832 */
1833 static void hdlcdev_exit(struct slgt_info *info)
1834 {
1835 unregister_hdlc_device(info->netdev);
1836 free_netdev(info->netdev);
1837 info->netdev = NULL;
1838 }
1839
1840 #endif /* ifdef CONFIG_HDLC */
1841
1842 /*
1843 * get async data from rx DMA buffers
1844 */
1845 static void rx_async(struct slgt_info *info)
1846 {
1847 struct tty_struct *tty = info->port.tty;
1848 struct mgsl_icount *icount = &info->icount;
1849 unsigned int start, end;
1850 unsigned char *p;
1851 unsigned char status;
1852 struct slgt_desc *bufs = info->rbufs;
1853 int i, count;
1854 int chars = 0;
1855 int stat;
1856 unsigned char ch;
1857
1858 start = end = info->rbuf_current;
1859
1860 while(desc_complete(bufs[end])) {
1861 count = desc_count(bufs[end]) - info->rbuf_index;
1862 p = bufs[end].buf + info->rbuf_index;
1863
1864 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1865 DBGDATA(info, p, count, "rx");
1866
1867 for(i=0 ; i < count; i+=2, p+=2) {
1868 ch = *p;
1869 icount->rx++;
1870
1871 stat = 0;
1872
1873 if ((status = *(p+1) & (BIT1 + BIT0))) {
1874 if (status & BIT1)
1875 icount->parity++;
1876 else if (status & BIT0)
1877 icount->frame++;
1878 /* discard char if tty control flags say so */
1879 if (status & info->ignore_status_mask)
1880 continue;
1881 if (status & BIT1)
1882 stat = TTY_PARITY;
1883 else if (status & BIT0)
1884 stat = TTY_FRAME;
1885 }
1886 if (tty) {
1887 tty_insert_flip_char(tty, ch, stat);
1888 chars++;
1889 }
1890 }
1891
1892 if (i < count) {
1893 /* receive buffer not completed */
1894 info->rbuf_index += i;
1895 mod_timer(&info->rx_timer, jiffies + 1);
1896 break;
1897 }
1898
1899 info->rbuf_index = 0;
1900 free_rbufs(info, end, end);
1901
1902 if (++end == info->rbuf_count)
1903 end = 0;
1904
1905 /* if entire list searched then no frame available */
1906 if (end == start)
1907 break;
1908 }
1909
1910 if (tty && chars)
1911 tty_flip_buffer_push(tty);
1912 }
1913
1914 /*
1915 * return next bottom half action to perform
1916 */
1917 static int bh_action(struct slgt_info *info)
1918 {
1919 unsigned long flags;
1920 int rc;
1921
1922 spin_lock_irqsave(&info->lock,flags);
1923
1924 if (info->pending_bh & BH_RECEIVE) {
1925 info->pending_bh &= ~BH_RECEIVE;
1926 rc = BH_RECEIVE;
1927 } else if (info->pending_bh & BH_TRANSMIT) {
1928 info->pending_bh &= ~BH_TRANSMIT;
1929 rc = BH_TRANSMIT;
1930 } else if (info->pending_bh & BH_STATUS) {
1931 info->pending_bh &= ~BH_STATUS;
1932 rc = BH_STATUS;
1933 } else {
1934 /* Mark BH routine as complete */
1935 info->bh_running = false;
1936 info->bh_requested = false;
1937 rc = 0;
1938 }
1939
1940 spin_unlock_irqrestore(&info->lock,flags);
1941
1942 return rc;
1943 }
1944
1945 /*
1946 * perform bottom half processing
1947 */
1948 static void bh_handler(struct work_struct *work)
1949 {
1950 struct slgt_info *info = container_of(work, struct slgt_info, task);
1951 int action;
1952
1953 if (!info)
1954 return;
1955 info->bh_running = true;
1956
1957 while((action = bh_action(info))) {
1958 switch (action) {
1959 case BH_RECEIVE:
1960 DBGBH(("%s bh receive\n", info->device_name));
1961 switch(info->params.mode) {
1962 case MGSL_MODE_ASYNC:
1963 rx_async(info);
1964 break;
1965 case MGSL_MODE_HDLC:
1966 while(rx_get_frame(info));
1967 break;
1968 case MGSL_MODE_RAW:
1969 case MGSL_MODE_MONOSYNC:
1970 case MGSL_MODE_BISYNC:
1971 while(rx_get_buf(info));
1972 break;
1973 }
1974 /* restart receiver if rx DMA buffers exhausted */
1975 if (info->rx_restart)
1976 rx_start(info);
1977 break;
1978 case BH_TRANSMIT:
1979 bh_transmit(info);
1980 break;
1981 case BH_STATUS:
1982 DBGBH(("%s bh status\n", info->device_name));
1983 info->ri_chkcount = 0;
1984 info->dsr_chkcount = 0;
1985 info->dcd_chkcount = 0;
1986 info->cts_chkcount = 0;
1987 break;
1988 default:
1989 DBGBH(("%s unknown action\n", info->device_name));
1990 break;
1991 }
1992 }
1993 DBGBH(("%s bh_handler exit\n", info->device_name));
1994 }
1995
1996 static void bh_transmit(struct slgt_info *info)
1997 {
1998 struct tty_struct *tty = info->port.tty;
1999
2000 DBGBH(("%s bh_transmit\n", info->device_name));
2001 if (tty)
2002 tty_wakeup(tty);
2003 }
2004
2005 static void dsr_change(struct slgt_info *info, unsigned short status)
2006 {
2007 if (status & BIT3) {
2008 info->signals |= SerialSignal_DSR;
2009 info->input_signal_events.dsr_up++;
2010 } else {
2011 info->signals &= ~SerialSignal_DSR;
2012 info->input_signal_events.dsr_down++;
2013 }
2014 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2015 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2016 slgt_irq_off(info, IRQ_DSR);
2017 return;
2018 }
2019 info->icount.dsr++;
2020 wake_up_interruptible(&info->status_event_wait_q);
2021 wake_up_interruptible(&info->event_wait_q);
2022 info->pending_bh |= BH_STATUS;
2023 }
2024
2025 static void cts_change(struct slgt_info *info, unsigned short status)
2026 {
2027 if (status & BIT2) {
2028 info->signals |= SerialSignal_CTS;
2029 info->input_signal_events.cts_up++;
2030 } else {
2031 info->signals &= ~SerialSignal_CTS;
2032 info->input_signal_events.cts_down++;
2033 }
2034 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2035 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2036 slgt_irq_off(info, IRQ_CTS);
2037 return;
2038 }
2039 info->icount.cts++;
2040 wake_up_interruptible(&info->status_event_wait_q);
2041 wake_up_interruptible(&info->event_wait_q);
2042 info->pending_bh |= BH_STATUS;
2043
2044 if (info->port.flags & ASYNC_CTS_FLOW) {
2045 if (info->port.tty) {
2046 if (info->port.tty->hw_stopped) {
2047 if (info->signals & SerialSignal_CTS) {
2048 info->port.tty->hw_stopped = 0;
2049 info->pending_bh |= BH_TRANSMIT;
2050 return;
2051 }
2052 } else {
2053 if (!(info->signals & SerialSignal_CTS))
2054 info->port.tty->hw_stopped = 1;
2055 }
2056 }
2057 }
2058 }
2059
2060 static void dcd_change(struct slgt_info *info, unsigned short status)
2061 {
2062 if (status & BIT1) {
2063 info->signals |= SerialSignal_DCD;
2064 info->input_signal_events.dcd_up++;
2065 } else {
2066 info->signals &= ~SerialSignal_DCD;
2067 info->input_signal_events.dcd_down++;
2068 }
2069 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2070 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2071 slgt_irq_off(info, IRQ_DCD);
2072 return;
2073 }
2074 info->icount.dcd++;
2075 #if SYNCLINK_GENERIC_HDLC
2076 if (info->netcount) {
2077 if (info->signals & SerialSignal_DCD)
2078 netif_carrier_on(info->netdev);
2079 else
2080 netif_carrier_off(info->netdev);
2081 }
2082 #endif
2083 wake_up_interruptible(&info->status_event_wait_q);
2084 wake_up_interruptible(&info->event_wait_q);
2085 info->pending_bh |= BH_STATUS;
2086
2087 if (info->port.flags & ASYNC_CHECK_CD) {
2088 if (info->signals & SerialSignal_DCD)
2089 wake_up_interruptible(&info->port.open_wait);
2090 else {
2091 if (info->port.tty)
2092 tty_hangup(info->port.tty);
2093 }
2094 }
2095 }
2096
2097 static void ri_change(struct slgt_info *info, unsigned short status)
2098 {
2099 if (status & BIT0) {
2100 info->signals |= SerialSignal_RI;
2101 info->input_signal_events.ri_up++;
2102 } else {
2103 info->signals &= ~SerialSignal_RI;
2104 info->input_signal_events.ri_down++;
2105 }
2106 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2107 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2108 slgt_irq_off(info, IRQ_RI);
2109 return;
2110 }
2111 info->icount.rng++;
2112 wake_up_interruptible(&info->status_event_wait_q);
2113 wake_up_interruptible(&info->event_wait_q);
2114 info->pending_bh |= BH_STATUS;
2115 }
2116
2117 static void isr_rxdata(struct slgt_info *info)
2118 {
2119 unsigned int count = info->rbuf_fill_count;
2120 unsigned int i = info->rbuf_fill_index;
2121 unsigned short reg;
2122
2123 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2124 reg = rd_reg16(info, RDR);
2125 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2126 if (desc_complete(info->rbufs[i])) {
2127 /* all buffers full */
2128 rx_stop(info);
2129 info->rx_restart = 1;
2130 continue;
2131 }
2132 info->rbufs[i].buf[count++] = (unsigned char)reg;
2133 /* async mode saves status byte to buffer for each data byte */
2134 if (info->params.mode == MGSL_MODE_ASYNC)
2135 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2136 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2137 /* buffer full or end of frame */
2138 set_desc_count(info->rbufs[i], count);
2139 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2140 info->rbuf_fill_count = count = 0;
2141 if (++i == info->rbuf_count)
2142 i = 0;
2143 info->pending_bh |= BH_RECEIVE;
2144 }
2145 }
2146
2147 info->rbuf_fill_index = i;
2148 info->rbuf_fill_count = count;
2149 }
2150
2151 static void isr_serial(struct slgt_info *info)
2152 {
2153 unsigned short status = rd_reg16(info, SSR);
2154
2155 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2156
2157 wr_reg16(info, SSR, status); /* clear pending */
2158
2159 info->irq_occurred = true;
2160
2161 if (info->params.mode == MGSL_MODE_ASYNC) {
2162 if (status & IRQ_TXIDLE) {
2163 if (info->tx_count)
2164 isr_txeom(info, status);
2165 }
2166 if (info->rx_pio && (status & IRQ_RXDATA))
2167 isr_rxdata(info);
2168 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2169 info->icount.brk++;
2170 /* process break detection if tty control allows */
2171 if (info->port.tty) {
2172 if (!(status & info->ignore_status_mask)) {
2173 if (info->read_status_mask & MASK_BREAK) {
2174 tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
2175 if (info->port.flags & ASYNC_SAK)
2176 do_SAK(info->port.tty);
2177 }
2178 }
2179 }
2180 }
2181 } else {
2182 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2183 isr_txeom(info, status);
2184 if (info->rx_pio && (status & IRQ_RXDATA))
2185 isr_rxdata(info);
2186 if (status & IRQ_RXIDLE) {
2187 if (status & RXIDLE)
2188 info->icount.rxidle++;
2189 else
2190 info->icount.exithunt++;
2191 wake_up_interruptible(&info->event_wait_q);
2192 }
2193
2194 if (status & IRQ_RXOVER)
2195 rx_start(info);
2196 }
2197
2198 if (status & IRQ_DSR)
2199 dsr_change(info, status);
2200 if (status & IRQ_CTS)
2201 cts_change(info, status);
2202 if (status & IRQ_DCD)
2203 dcd_change(info, status);
2204 if (status & IRQ_RI)
2205 ri_change(info, status);
2206 }
2207
2208 static void isr_rdma(struct slgt_info *info)
2209 {
2210 unsigned int status = rd_reg32(info, RDCSR);
2211
2212 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2213
2214 /* RDCSR (rx DMA control/status)
2215 *
2216 * 31..07 reserved
2217 * 06 save status byte to DMA buffer
2218 * 05 error
2219 * 04 eol (end of list)
2220 * 03 eob (end of buffer)
2221 * 02 IRQ enable
2222 * 01 reset
2223 * 00 enable
2224 */
2225 wr_reg32(info, RDCSR, status); /* clear pending */
2226
2227 if (status & (BIT5 + BIT4)) {
2228 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2229 info->rx_restart = true;
2230 }
2231 info->pending_bh |= BH_RECEIVE;
2232 }
2233
2234 static void isr_tdma(struct slgt_info *info)
2235 {
2236 unsigned int status = rd_reg32(info, TDCSR);
2237
2238 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2239
2240 /* TDCSR (tx DMA control/status)
2241 *
2242 * 31..06 reserved
2243 * 05 error
2244 * 04 eol (end of list)
2245 * 03 eob (end of buffer)
2246 * 02 IRQ enable
2247 * 01 reset
2248 * 00 enable
2249 */
2250 wr_reg32(info, TDCSR, status); /* clear pending */
2251
2252 if (status & (BIT5 + BIT4 + BIT3)) {
2253 // another transmit buffer has completed
2254 // run bottom half to get more send data from user
2255 info->pending_bh |= BH_TRANSMIT;
2256 }
2257 }
2258
2259 static void isr_txeom(struct slgt_info *info, unsigned short status)
2260 {
2261 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2262
2263 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2264 tdma_reset(info);
2265 reset_tbufs(info);
2266 if (status & IRQ_TXUNDER) {
2267 unsigned short val = rd_reg16(info, TCR);
2268 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2269 wr_reg16(info, TCR, val); /* clear reset bit */
2270 }
2271
2272 if (info->tx_active) {
2273 if (info->params.mode != MGSL_MODE_ASYNC) {
2274 if (status & IRQ_TXUNDER)
2275 info->icount.txunder++;
2276 else if (status & IRQ_TXIDLE)
2277 info->icount.txok++;
2278 }
2279
2280 info->tx_active = false;
2281 info->tx_count = 0;
2282
2283 del_timer(&info->tx_timer);
2284
2285 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2286 info->signals &= ~SerialSignal_RTS;
2287 info->drop_rts_on_tx_done = false;
2288 set_signals(info);
2289 }
2290
2291 #if SYNCLINK_GENERIC_HDLC
2292 if (info->netcount)
2293 hdlcdev_tx_done(info);
2294 else
2295 #endif
2296 {
2297 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2298 tx_stop(info);
2299 return;
2300 }
2301 info->pending_bh |= BH_TRANSMIT;
2302 }
2303 }
2304 }
2305
2306 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2307 {
2308 struct cond_wait *w, *prev;
2309
2310 /* wake processes waiting for specific transitions */
2311 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2312 if (w->data & changed) {
2313 w->data = state;
2314 wake_up_interruptible(&w->q);
2315 if (prev != NULL)
2316 prev->next = w->next;
2317 else
2318 info->gpio_wait_q = w->next;
2319 } else
2320 prev = w;
2321 }
2322 }
2323
2324 /* interrupt service routine
2325 *
2326 * irq interrupt number
2327 * dev_id device ID supplied during interrupt registration
2328 */
2329 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2330 {
2331 struct slgt_info *info = dev_id;
2332 unsigned int gsr;
2333 unsigned int i;
2334
2335 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2336
2337 spin_lock(&info->lock);
2338
2339 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2340 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2341 info->irq_occurred = true;
2342 for(i=0; i < info->port_count ; i++) {
2343 if (info->port_array[i] == NULL)
2344 continue;
2345 if (gsr & (BIT8 << i))
2346 isr_serial(info->port_array[i]);
2347 if (gsr & (BIT16 << (i*2)))
2348 isr_rdma(info->port_array[i]);
2349 if (gsr & (BIT17 << (i*2)))
2350 isr_tdma(info->port_array[i]);
2351 }
2352 }
2353
2354 if (info->gpio_present) {
2355 unsigned int state;
2356 unsigned int changed;
2357 while ((changed = rd_reg32(info, IOSR)) != 0) {
2358 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2359 /* read latched state of GPIO signals */
2360 state = rd_reg32(info, IOVR);
2361 /* clear pending GPIO interrupt bits */
2362 wr_reg32(info, IOSR, changed);
2363 for (i=0 ; i < info->port_count ; i++) {
2364 if (info->port_array[i] != NULL)
2365 isr_gpio(info->port_array[i], changed, state);
2366 }
2367 }
2368 }
2369
2370 for(i=0; i < info->port_count ; i++) {
2371 struct slgt_info *port = info->port_array[i];
2372
2373 if (port && (port->port.count || port->netcount) &&
2374 port->pending_bh && !port->bh_running &&
2375 !port->bh_requested) {
2376 DBGISR(("%s bh queued\n", port->device_name));
2377 schedule_work(&port->task);
2378 port->bh_requested = true;
2379 }
2380 }
2381
2382 spin_unlock(&info->lock);
2383
2384 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2385 return IRQ_HANDLED;
2386 }
2387
2388 static int startup(struct slgt_info *info)
2389 {
2390 DBGINFO(("%s startup\n", info->device_name));
2391
2392 if (info->port.flags & ASYNC_INITIALIZED)
2393 return 0;
2394
2395 if (!info->tx_buf) {
2396 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2397 if (!info->tx_buf) {
2398 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2399 return -ENOMEM;
2400 }
2401 }
2402
2403 info->pending_bh = 0;
2404
2405 memset(&info->icount, 0, sizeof(info->icount));
2406
2407 /* program hardware for current parameters */
2408 change_params(info);
2409
2410 if (info->port.tty)
2411 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2412
2413 info->port.flags |= ASYNC_INITIALIZED;
2414
2415 return 0;
2416 }
2417
2418 /*
2419 * called by close() and hangup() to shutdown hardware
2420 */
2421 static void shutdown(struct slgt_info *info)
2422 {
2423 unsigned long flags;
2424
2425 if (!(info->port.flags & ASYNC_INITIALIZED))
2426 return;
2427
2428 DBGINFO(("%s shutdown\n", info->device_name));
2429
2430 /* clear status wait queue because status changes */
2431 /* can't happen after shutting down the hardware */
2432 wake_up_interruptible(&info->status_event_wait_q);
2433 wake_up_interruptible(&info->event_wait_q);
2434
2435 del_timer_sync(&info->tx_timer);
2436 del_timer_sync(&info->rx_timer);
2437
2438 kfree(info->tx_buf);
2439 info->tx_buf = NULL;
2440
2441 spin_lock_irqsave(&info->lock,flags);
2442
2443 tx_stop(info);
2444 rx_stop(info);
2445
2446 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2447
2448 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2449 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2450 set_signals(info);
2451 }
2452
2453 flush_cond_wait(&info->gpio_wait_q);
2454
2455 spin_unlock_irqrestore(&info->lock,flags);
2456
2457 if (info->port.tty)
2458 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2459
2460 info->port.flags &= ~ASYNC_INITIALIZED;
2461 }
2462
2463 static void program_hw(struct slgt_info *info)
2464 {
2465 unsigned long flags;
2466
2467 spin_lock_irqsave(&info->lock,flags);
2468
2469 rx_stop(info);
2470 tx_stop(info);
2471
2472 if (info->params.mode != MGSL_MODE_ASYNC ||
2473 info->netcount)
2474 sync_mode(info);
2475 else
2476 async_mode(info);
2477
2478 set_signals(info);
2479
2480 info->dcd_chkcount = 0;
2481 info->cts_chkcount = 0;
2482 info->ri_chkcount = 0;
2483 info->dsr_chkcount = 0;
2484
2485 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2486 get_signals(info);
2487
2488 if (info->netcount ||
2489 (info->port.tty && info->port.tty->termios->c_cflag & CREAD))
2490 rx_start(info);
2491
2492 spin_unlock_irqrestore(&info->lock,flags);
2493 }
2494
2495 /*
2496 * reconfigure adapter based on new parameters
2497 */
2498 static void change_params(struct slgt_info *info)
2499 {
2500 unsigned cflag;
2501 int bits_per_char;
2502
2503 if (!info->port.tty || !info->port.tty->termios)
2504 return;
2505 DBGINFO(("%s change_params\n", info->device_name));
2506
2507 cflag = info->port.tty->termios->c_cflag;
2508
2509 /* if B0 rate (hangup) specified then negate DTR and RTS */
2510 /* otherwise assert DTR and RTS */
2511 if (cflag & CBAUD)
2512 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
2513 else
2514 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2515
2516 /* byte size and parity */
2517
2518 switch (cflag & CSIZE) {
2519 case CS5: info->params.data_bits = 5; break;
2520 case CS6: info->params.data_bits = 6; break;
2521 case CS7: info->params.data_bits = 7; break;
2522 case CS8: info->params.data_bits = 8; break;
2523 default: info->params.data_bits = 7; break;
2524 }
2525
2526 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2527
2528 if (cflag & PARENB)
2529 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2530 else
2531 info->params.parity = ASYNC_PARITY_NONE;
2532
2533 /* calculate number of jiffies to transmit a full
2534 * FIFO (32 bytes) at specified data rate
2535 */
2536 bits_per_char = info->params.data_bits +
2537 info->params.stop_bits + 1;
2538
2539 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2540
2541 if (info->params.data_rate) {
2542 info->timeout = (32*HZ*bits_per_char) /
2543 info->params.data_rate;
2544 }
2545 info->timeout += HZ/50; /* Add .02 seconds of slop */
2546
2547 if (cflag & CRTSCTS)
2548 info->port.flags |= ASYNC_CTS_FLOW;
2549 else
2550 info->port.flags &= ~ASYNC_CTS_FLOW;
2551
2552 if (cflag & CLOCAL)
2553 info->port.flags &= ~ASYNC_CHECK_CD;
2554 else
2555 info->port.flags |= ASYNC_CHECK_CD;
2556
2557 /* process tty input control flags */
2558
2559 info->read_status_mask = IRQ_RXOVER;
2560 if (I_INPCK(info->port.tty))
2561 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2562 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2563 info->read_status_mask |= MASK_BREAK;
2564 if (I_IGNPAR(info->port.tty))
2565 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2566 if (I_IGNBRK(info->port.tty)) {
2567 info->ignore_status_mask |= MASK_BREAK;
2568 /* If ignoring parity and break indicators, ignore
2569 * overruns too. (For real raw support).
2570 */
2571 if (I_IGNPAR(info->port.tty))
2572 info->ignore_status_mask |= MASK_OVERRUN;
2573 }
2574
2575 program_hw(info);
2576 }
2577
2578 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2579 {
2580 DBGINFO(("%s get_stats\n", info->device_name));
2581 if (!user_icount) {
2582 memset(&info->icount, 0, sizeof(info->icount));
2583 } else {
2584 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2585 return -EFAULT;
2586 }
2587 return 0;
2588 }
2589
2590 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2591 {
2592 DBGINFO(("%s get_params\n", info->device_name));
2593 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2594 return -EFAULT;
2595 return 0;
2596 }
2597
2598 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2599 {
2600 unsigned long flags;
2601 MGSL_PARAMS tmp_params;
2602
2603 DBGINFO(("%s set_params\n", info->device_name));
2604 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2605 return -EFAULT;
2606
2607 spin_lock_irqsave(&info->lock, flags);
2608 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2609 info->base_clock = tmp_params.clock_speed;
2610 else
2611 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2612 spin_unlock_irqrestore(&info->lock, flags);
2613
2614 program_hw(info);
2615
2616 return 0;
2617 }
2618
2619 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2620 {
2621 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2622 if (put_user(info->idle_mode, idle_mode))
2623 return -EFAULT;
2624 return 0;
2625 }
2626
2627 static int set_txidle(struct slgt_info *info, int idle_mode)
2628 {
2629 unsigned long flags;
2630 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2631 spin_lock_irqsave(&info->lock,flags);
2632 info->idle_mode = idle_mode;
2633 if (info->params.mode != MGSL_MODE_ASYNC)
2634 tx_set_idle(info);
2635 spin_unlock_irqrestore(&info->lock,flags);
2636 return 0;
2637 }
2638
2639 static int tx_enable(struct slgt_info *info, int enable)
2640 {
2641 unsigned long flags;
2642 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2643 spin_lock_irqsave(&info->lock,flags);
2644 if (enable) {
2645 if (!info->tx_enabled)
2646 tx_start(info);
2647 } else {
2648 if (info->tx_enabled)
2649 tx_stop(info);
2650 }
2651 spin_unlock_irqrestore(&info->lock,flags);
2652 return 0;
2653 }
2654
2655 /*
2656 * abort transmit HDLC frame
2657 */
2658 static int tx_abort(struct slgt_info *info)
2659 {
2660 unsigned long flags;
2661 DBGINFO(("%s tx_abort\n", info->device_name));
2662 spin_lock_irqsave(&info->lock,flags);
2663 tdma_reset(info);
2664 spin_unlock_irqrestore(&info->lock,flags);
2665 return 0;
2666 }
2667
2668 static int rx_enable(struct slgt_info *info, int enable)
2669 {
2670 unsigned long flags;
2671 unsigned int rbuf_fill_level;
2672 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2673 spin_lock_irqsave(&info->lock,flags);
2674 /*
2675 * enable[31..16] = receive DMA buffer fill level
2676 * 0 = noop (leave fill level unchanged)
2677 * fill level must be multiple of 4 and <= buffer size
2678 */
2679 rbuf_fill_level = ((unsigned int)enable) >> 16;
2680 if (rbuf_fill_level) {
2681 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2682 spin_unlock_irqrestore(&info->lock, flags);
2683 return -EINVAL;
2684 }
2685 info->rbuf_fill_level = rbuf_fill_level;
2686 if (rbuf_fill_level < 128)
2687 info->rx_pio = 1; /* PIO mode */
2688 else
2689 info->rx_pio = 0; /* DMA mode */
2690 rx_stop(info); /* restart receiver to use new fill level */
2691 }
2692
2693 /*
2694 * enable[1..0] = receiver enable command
2695 * 0 = disable
2696 * 1 = enable
2697 * 2 = enable or force hunt mode if already enabled
2698 */
2699 enable &= 3;
2700 if (enable) {
2701 if (!info->rx_enabled)
2702 rx_start(info);
2703 else if (enable == 2) {
2704 /* force hunt mode (write 1 to RCR[3]) */
2705 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2706 }
2707 } else {
2708 if (info->rx_enabled)
2709 rx_stop(info);
2710 }
2711 spin_unlock_irqrestore(&info->lock,flags);
2712 return 0;
2713 }
2714
2715 /*
2716 * wait for specified event to occur
2717 */
2718 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2719 {
2720 unsigned long flags;
2721 int s;
2722 int rc=0;
2723 struct mgsl_icount cprev, cnow;
2724 int events;
2725 int mask;
2726 struct _input_signal_events oldsigs, newsigs;
2727 DECLARE_WAITQUEUE(wait, current);
2728
2729 if (get_user(mask, mask_ptr))
2730 return -EFAULT;
2731
2732 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2733
2734 spin_lock_irqsave(&info->lock,flags);
2735
2736 /* return immediately if state matches requested events */
2737 get_signals(info);
2738 s = info->signals;
2739
2740 events = mask &
2741 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2742 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2743 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2744 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2745 if (events) {
2746 spin_unlock_irqrestore(&info->lock,flags);
2747 goto exit;
2748 }
2749
2750 /* save current irq counts */
2751 cprev = info->icount;
2752 oldsigs = info->input_signal_events;
2753
2754 /* enable hunt and idle irqs if needed */
2755 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2756 unsigned short val = rd_reg16(info, SCR);
2757 if (!(val & IRQ_RXIDLE))
2758 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2759 }
2760
2761 set_current_state(TASK_INTERRUPTIBLE);
2762 add_wait_queue(&info->event_wait_q, &wait);
2763
2764 spin_unlock_irqrestore(&info->lock,flags);
2765
2766 for(;;) {
2767 schedule();
2768 if (signal_pending(current)) {
2769 rc = -ERESTARTSYS;
2770 break;
2771 }
2772
2773 /* get current irq counts */
2774 spin_lock_irqsave(&info->lock,flags);
2775 cnow = info->icount;
2776 newsigs = info->input_signal_events;
2777 set_current_state(TASK_INTERRUPTIBLE);
2778 spin_unlock_irqrestore(&info->lock,flags);
2779
2780 /* if no change, wait aborted for some reason */
2781 if (newsigs.dsr_up == oldsigs.dsr_up &&
2782 newsigs.dsr_down == oldsigs.dsr_down &&
2783 newsigs.dcd_up == oldsigs.dcd_up &&
2784 newsigs.dcd_down == oldsigs.dcd_down &&
2785 newsigs.cts_up == oldsigs.cts_up &&
2786 newsigs.cts_down == oldsigs.cts_down &&
2787 newsigs.ri_up == oldsigs.ri_up &&
2788 newsigs.ri_down == oldsigs.ri_down &&
2789 cnow.exithunt == cprev.exithunt &&
2790 cnow.rxidle == cprev.rxidle) {
2791 rc = -EIO;
2792 break;
2793 }
2794
2795 events = mask &
2796 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2797 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2798 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2799 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2800 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2801 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2802 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2803 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2804 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2805 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2806 if (events)
2807 break;
2808
2809 cprev = cnow;
2810 oldsigs = newsigs;
2811 }
2812
2813 remove_wait_queue(&info->event_wait_q, &wait);
2814 set_current_state(TASK_RUNNING);
2815
2816
2817 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2818 spin_lock_irqsave(&info->lock,flags);
2819 if (!waitqueue_active(&info->event_wait_q)) {
2820 /* disable enable exit hunt mode/idle rcvd IRQs */
2821 wr_reg16(info, SCR,
2822 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2823 }
2824 spin_unlock_irqrestore(&info->lock,flags);
2825 }
2826 exit:
2827 if (rc == 0)
2828 rc = put_user(events, mask_ptr);
2829 return rc;
2830 }
2831
2832 static int get_interface(struct slgt_info *info, int __user *if_mode)
2833 {
2834 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2835 if (put_user(info->if_mode, if_mode))
2836 return -EFAULT;
2837 return 0;
2838 }
2839
2840 static int set_interface(struct slgt_info *info, int if_mode)
2841 {
2842 unsigned long flags;
2843 unsigned short val;
2844
2845 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2846 spin_lock_irqsave(&info->lock,flags);
2847 info->if_mode = if_mode;
2848
2849 msc_set_vcr(info);
2850
2851 /* TCR (tx control) 07 1=RTS driver control */
2852 val = rd_reg16(info, TCR);
2853 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2854 val |= BIT7;
2855 else
2856 val &= ~BIT7;
2857 wr_reg16(info, TCR, val);
2858
2859 spin_unlock_irqrestore(&info->lock,flags);
2860 return 0;
2861 }
2862
2863 /*
2864 * set general purpose IO pin state and direction
2865 *
2866 * user_gpio fields:
2867 * state each bit indicates a pin state
2868 * smask set bit indicates pin state to set
2869 * dir each bit indicates a pin direction (0=input, 1=output)
2870 * dmask set bit indicates pin direction to set
2871 */
2872 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2873 {
2874 unsigned long flags;
2875 struct gpio_desc gpio;
2876 __u32 data;
2877
2878 if (!info->gpio_present)
2879 return -EINVAL;
2880 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2881 return -EFAULT;
2882 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2883 info->device_name, gpio.state, gpio.smask,
2884 gpio.dir, gpio.dmask));
2885
2886 spin_lock_irqsave(&info->lock,flags);
2887 if (gpio.dmask) {
2888 data = rd_reg32(info, IODR);
2889 data |= gpio.dmask & gpio.dir;
2890 data &= ~(gpio.dmask & ~gpio.dir);
2891 wr_reg32(info, IODR, data);
2892 }
2893 if (gpio.smask) {
2894 data = rd_reg32(info, IOVR);
2895 data |= gpio.smask & gpio.state;
2896 data &= ~(gpio.smask & ~gpio.state);
2897 wr_reg32(info, IOVR, data);
2898 }
2899 spin_unlock_irqrestore(&info->lock,flags);
2900
2901 return 0;
2902 }
2903
2904 /*
2905 * get general purpose IO pin state and direction
2906 */
2907 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2908 {
2909 struct gpio_desc gpio;
2910 if (!info->gpio_present)
2911 return -EINVAL;
2912 gpio.state = rd_reg32(info, IOVR);
2913 gpio.smask = 0xffffffff;
2914 gpio.dir = rd_reg32(info, IODR);
2915 gpio.dmask = 0xffffffff;
2916 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2917 return -EFAULT;
2918 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2919 info->device_name, gpio.state, gpio.dir));
2920 return 0;
2921 }
2922
2923 /*
2924 * conditional wait facility
2925 */
2926 static void init_cond_wait(struct cond_wait *w, unsigned int data)
2927 {
2928 init_waitqueue_head(&w->q);
2929 init_waitqueue_entry(&w->wait, current);
2930 w->data = data;
2931 }
2932
2933 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2934 {
2935 set_current_state(TASK_INTERRUPTIBLE);
2936 add_wait_queue(&w->q, &w->wait);
2937 w->next = *head;
2938 *head = w;
2939 }
2940
2941 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2942 {
2943 struct cond_wait *w, *prev;
2944 remove_wait_queue(&cw->q, &cw->wait);
2945 set_current_state(TASK_RUNNING);
2946 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2947 if (w == cw) {
2948 if (prev != NULL)
2949 prev->next = w->next;
2950 else
2951 *head = w->next;
2952 break;
2953 }
2954 }
2955 }
2956
2957 static void flush_cond_wait(struct cond_wait **head)
2958 {
2959 while (*head != NULL) {
2960 wake_up_interruptible(&(*head)->q);
2961 *head = (*head)->next;
2962 }
2963 }
2964
2965 /*
2966 * wait for general purpose I/O pin(s) to enter specified state
2967 *
2968 * user_gpio fields:
2969 * state - bit indicates target pin state
2970 * smask - set bit indicates watched pin
2971 *
2972 * The wait ends when at least one watched pin enters the specified
2973 * state. When 0 (no error) is returned, user_gpio->state is set to the
2974 * state of all GPIO pins when the wait ends.
2975 *
2976 * Note: Each pin may be a dedicated input, dedicated output, or
2977 * configurable input/output. The number and configuration of pins
2978 * varies with the specific adapter model. Only input pins (dedicated
2979 * or configured) can be monitored with this function.
2980 */
2981 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2982 {
2983 unsigned long flags;
2984 int rc = 0;
2985 struct gpio_desc gpio;
2986 struct cond_wait wait;
2987 u32 state;
2988
2989 if (!info->gpio_present)
2990 return -EINVAL;
2991 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2992 return -EFAULT;
2993 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2994 info->device_name, gpio.state, gpio.smask));
2995 /* ignore output pins identified by set IODR bit */
2996 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2997 return -EINVAL;
2998 init_cond_wait(&wait, gpio.smask);
2999
3000 spin_lock_irqsave(&info->lock, flags);
3001 /* enable interrupts for watched pins */
3002 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3003 /* get current pin states */
3004 state = rd_reg32(info, IOVR);
3005
3006 if (gpio.smask & ~(state ^ gpio.state)) {
3007 /* already in target state */
3008 gpio.state = state;
3009 } else {
3010 /* wait for target state */
3011 add_cond_wait(&info->gpio_wait_q, &wait);
3012 spin_unlock_irqrestore(&info->lock, flags);
3013 schedule();
3014 if (signal_pending(current))
3015 rc = -ERESTARTSYS;
3016 else
3017 gpio.state = wait.data;
3018 spin_lock_irqsave(&info->lock, flags);
3019 remove_cond_wait(&info->gpio_wait_q, &wait);
3020 }
3021
3022 /* disable all GPIO interrupts if no waiting processes */
3023 if (info->gpio_wait_q == NULL)
3024 wr_reg32(info, IOER, 0);
3025 spin_unlock_irqrestore(&info->lock,flags);
3026
3027 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3028 rc = -EFAULT;
3029 return rc;
3030 }
3031
3032 static int modem_input_wait(struct slgt_info *info,int arg)
3033 {
3034 unsigned long flags;
3035 int rc;
3036 struct mgsl_icount cprev, cnow;
3037 DECLARE_WAITQUEUE(wait, current);
3038
3039 /* save current irq counts */
3040 spin_lock_irqsave(&info->lock,flags);
3041 cprev = info->icount;
3042 add_wait_queue(&info->status_event_wait_q, &wait);
3043 set_current_state(TASK_INTERRUPTIBLE);
3044 spin_unlock_irqrestore(&info->lock,flags);
3045
3046 for(;;) {
3047 schedule();
3048 if (signal_pending(current)) {
3049 rc = -ERESTARTSYS;
3050 break;
3051 }
3052
3053 /* get new irq counts */
3054 spin_lock_irqsave(&info->lock,flags);
3055 cnow = info->icount;
3056 set_current_state(TASK_INTERRUPTIBLE);
3057 spin_unlock_irqrestore(&info->lock,flags);
3058
3059 /* if no change, wait aborted for some reason */
3060 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3061 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3062 rc = -EIO;
3063 break;
3064 }
3065
3066 /* check for change in caller specified modem input */
3067 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3068 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3069 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3070 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3071 rc = 0;
3072 break;
3073 }
3074
3075 cprev = cnow;
3076 }
3077 remove_wait_queue(&info->status_event_wait_q, &wait);
3078 set_current_state(TASK_RUNNING);
3079 return rc;
3080 }
3081
3082 /*
3083 * return state of serial control and status signals
3084 */
3085 static int tiocmget(struct tty_struct *tty, struct file *file)
3086 {
3087 struct slgt_info *info = tty->driver_data;
3088 unsigned int result;
3089 unsigned long flags;
3090
3091 spin_lock_irqsave(&info->lock,flags);
3092 get_signals(info);
3093 spin_unlock_irqrestore(&info->lock,flags);
3094
3095 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3096 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3097 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3098 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3099 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3100 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3101
3102 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3103 return result;
3104 }
3105
3106 /*
3107 * set modem control signals (DTR/RTS)
3108 *
3109 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3110 * TIOCMSET = set/clear signal values
3111 * value bit mask for command
3112 */
3113 static int tiocmset(struct tty_struct *tty, struct file *file,
3114 unsigned int set, unsigned int clear)
3115 {
3116 struct slgt_info *info = tty->driver_data;
3117 unsigned long flags;
3118
3119 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3120
3121 if (set & TIOCM_RTS)
3122 info->signals |= SerialSignal_RTS;
3123 if (set & TIOCM_DTR)
3124 info->signals |= SerialSignal_DTR;
3125 if (clear & TIOCM_RTS)
3126 info->signals &= ~SerialSignal_RTS;
3127 if (clear & TIOCM_DTR)
3128 info->signals &= ~SerialSignal_DTR;
3129
3130 spin_lock_irqsave(&info->lock,flags);
3131 set_signals(info);
3132 spin_unlock_irqrestore(&info->lock,flags);
3133 return 0;
3134 }
3135
3136 static int carrier_raised(struct tty_port *port)
3137 {
3138 unsigned long flags;
3139 struct slgt_info *info = container_of(port, struct slgt_info, port);
3140
3141 spin_lock_irqsave(&info->lock,flags);
3142 get_signals(info);
3143 spin_unlock_irqrestore(&info->lock,flags);
3144 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3145 }
3146
3147 static void dtr_rts(struct tty_port *port, int on)
3148 {
3149 unsigned long flags;
3150 struct slgt_info *info = container_of(port, struct slgt_info, port);
3151
3152 spin_lock_irqsave(&info->lock,flags);
3153 if (on)
3154 info->signals |= SerialSignal_RTS + SerialSignal_DTR;
3155 else
3156 info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3157 set_signals(info);
3158 spin_unlock_irqrestore(&info->lock,flags);
3159 }
3160
3161
3162 /*
3163 * block current process until the device is ready to open
3164 */
3165 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3166 struct slgt_info *info)
3167 {
3168 DECLARE_WAITQUEUE(wait, current);
3169 int retval;
3170 bool do_clocal = false;
3171 bool extra_count = false;
3172 unsigned long flags;
3173 int cd;
3174 struct tty_port *port = &info->port;
3175
3176 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3177
3178 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3179 /* nonblock mode is set or port is not enabled */
3180 port->flags |= ASYNC_NORMAL_ACTIVE;
3181 return 0;
3182 }
3183
3184 if (tty->termios->c_cflag & CLOCAL)
3185 do_clocal = true;
3186
3187 /* Wait for carrier detect and the line to become
3188 * free (i.e., not in use by the callout). While we are in
3189 * this loop, port->count is dropped by one, so that
3190 * close() knows when to free things. We restore it upon
3191 * exit, either normal or abnormal.
3192 */
3193
3194 retval = 0;
3195 add_wait_queue(&port->open_wait, &wait);
3196
3197 spin_lock_irqsave(&info->lock, flags);
3198 if (!tty_hung_up_p(filp)) {
3199 extra_count = true;
3200 port->count--;
3201 }
3202 spin_unlock_irqrestore(&info->lock, flags);
3203 port->blocked_open++;
3204
3205 while (1) {
3206 if ((tty->termios->c_cflag & CBAUD))
3207 tty_port_raise_dtr_rts(port);
3208
3209 set_current_state(TASK_INTERRUPTIBLE);
3210
3211 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3212 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3213 -EAGAIN : -ERESTARTSYS;
3214 break;
3215 }
3216
3217 cd = tty_port_carrier_raised(port);
3218
3219 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
3220 break;
3221
3222 if (signal_pending(current)) {
3223 retval = -ERESTARTSYS;
3224 break;
3225 }
3226
3227 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3228 schedule();
3229 }
3230
3231 set_current_state(TASK_RUNNING);
3232 remove_wait_queue(&port->open_wait, &wait);
3233
3234 if (extra_count)
3235 port->count++;
3236 port->blocked_open--;
3237
3238 if (!retval)
3239 port->flags |= ASYNC_NORMAL_ACTIVE;
3240
3241 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3242 return retval;
3243 }
3244
3245 static int alloc_tmp_rbuf(struct slgt_info *info)
3246 {
3247 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3248 if (info->tmp_rbuf == NULL)
3249 return -ENOMEM;
3250 return 0;
3251 }
3252
3253 static void free_tmp_rbuf(struct slgt_info *info)
3254 {
3255 kfree(info->tmp_rbuf);
3256 info->tmp_rbuf = NULL;
3257 }
3258
3259 /*
3260 * allocate DMA descriptor lists.
3261 */
3262 static int alloc_desc(struct slgt_info *info)
3263 {
3264 unsigned int i;
3265 unsigned int pbufs;
3266
3267 /* allocate memory to hold descriptor lists */
3268 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3269 if (info->bufs == NULL)
3270 return -ENOMEM;
3271
3272 memset(info->bufs, 0, DESC_LIST_SIZE);
3273
3274 info->rbufs = (struct slgt_desc*)info->bufs;
3275 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3276
3277 pbufs = (unsigned int)info->bufs_dma_addr;
3278
3279 /*
3280 * Build circular lists of descriptors
3281 */
3282
3283 for (i=0; i < info->rbuf_count; i++) {
3284 /* physical address of this descriptor */
3285 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3286
3287 /* physical address of next descriptor */
3288 if (i == info->rbuf_count - 1)
3289 info->rbufs[i].next = cpu_to_le32(pbufs);
3290 else
3291 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3292 set_desc_count(info->rbufs[i], DMABUFSIZE);
3293 }
3294
3295 for (i=0; i < info->tbuf_count; i++) {
3296 /* physical address of this descriptor */
3297 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3298
3299 /* physical address of next descriptor */
3300 if (i == info->tbuf_count - 1)
3301 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3302 else
3303 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3304 }
3305
3306 return 0;
3307 }
3308
3309 static void free_desc(struct slgt_info *info)
3310 {
3311 if (info->bufs != NULL) {
3312 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3313 info->bufs = NULL;
3314 info->rbufs = NULL;
3315 info->tbufs = NULL;
3316 }
3317 }
3318
3319 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3320 {
3321 int i;
3322 for (i=0; i < count; i++) {
3323 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3324 return -ENOMEM;
3325 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3326 }
3327 return 0;
3328 }
3329
3330 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3331 {
3332 int i;
3333 for (i=0; i < count; i++) {
3334 if (bufs[i].buf == NULL)
3335 continue;
3336 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3337 bufs[i].buf = NULL;
3338 }
3339 }
3340
3341 static int alloc_dma_bufs(struct slgt_info *info)
3342 {
3343 info->rbuf_count = 32;
3344 info->tbuf_count = 32;
3345
3346 if (alloc_desc(info) < 0 ||
3347 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3348 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3349 alloc_tmp_rbuf(info) < 0) {
3350 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3351 return -ENOMEM;
3352 }
3353 reset_rbufs(info);
3354 return 0;
3355 }
3356
3357 static void free_dma_bufs(struct slgt_info *info)
3358 {
3359 if (info->bufs) {
3360 free_bufs(info, info->rbufs, info->rbuf_count);
3361 free_bufs(info, info->tbufs, info->tbuf_count);
3362 free_desc(info);
3363 }
3364 free_tmp_rbuf(info);
3365 }
3366
3367 static int claim_resources(struct slgt_info *info)
3368 {
3369 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3370 DBGERR(("%s reg addr conflict, addr=%08X\n",
3371 info->device_name, info->phys_reg_addr));
3372 info->init_error = DiagStatus_AddressConflict;
3373 goto errout;
3374 }
3375 else
3376 info->reg_addr_requested = true;
3377
3378 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3379 if (!info->reg_addr) {
3380 DBGERR(("%s cant map device registers, addr=%08X\n",
3381 info->device_name, info->phys_reg_addr));
3382 info->init_error = DiagStatus_CantAssignPciResources;
3383 goto errout;
3384 }
3385 return 0;
3386
3387 errout:
3388 release_resources(info);
3389 return -ENODEV;
3390 }
3391
3392 static void release_resources(struct slgt_info *info)
3393 {
3394 if (info->irq_requested) {
3395 free_irq(info->irq_level, info);
3396 info->irq_requested = false;
3397 }
3398
3399 if (info->reg_addr_requested) {
3400 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3401 info->reg_addr_requested = false;
3402 }
3403
3404 if (info->reg_addr) {
3405 iounmap(info->reg_addr);
3406 info->reg_addr = NULL;
3407 }
3408 }
3409
3410 /* Add the specified device instance data structure to the
3411 * global linked list of devices and increment the device count.
3412 */
3413 static void add_device(struct slgt_info *info)
3414 {
3415 char *devstr;
3416
3417 info->next_device = NULL;
3418 info->line = slgt_device_count;
3419 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3420
3421 if (info->line < MAX_DEVICES) {
3422 if (maxframe[info->line])
3423 info->max_frame_size = maxframe[info->line];
3424 }
3425
3426 slgt_device_count++;
3427
3428 if (!slgt_device_list)
3429 slgt_device_list = info;
3430 else {
3431 struct slgt_info *current_dev = slgt_device_list;
3432 while(current_dev->next_device)
3433 current_dev = current_dev->next_device;
3434 current_dev->next_device = info;
3435 }
3436
3437 if (info->max_frame_size < 4096)
3438 info->max_frame_size = 4096;
3439 else if (info->max_frame_size > 65535)
3440 info->max_frame_size = 65535;
3441
3442 switch(info->pdev->device) {
3443 case SYNCLINK_GT_DEVICE_ID:
3444 devstr = "GT";
3445 break;
3446 case SYNCLINK_GT2_DEVICE_ID:
3447 devstr = "GT2";
3448 break;
3449 case SYNCLINK_GT4_DEVICE_ID:
3450 devstr = "GT4";
3451 break;
3452 case SYNCLINK_AC_DEVICE_ID:
3453 devstr = "AC";
3454 info->params.mode = MGSL_MODE_ASYNC;
3455 break;
3456 default:
3457 devstr = "(unknown model)";
3458 }
3459 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3460 devstr, info->device_name, info->phys_reg_addr,
3461 info->irq_level, info->max_frame_size);
3462
3463 #if SYNCLINK_GENERIC_HDLC
3464 hdlcdev_init(info);
3465 #endif
3466 }
3467
3468 static const struct tty_port_operations slgt_port_ops = {
3469 .carrier_raised = carrier_raised,
3470 .dtr_rts = dtr_rts,
3471 };
3472
3473 /*
3474 * allocate device instance structure, return NULL on failure
3475 */
3476 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3477 {
3478 struct slgt_info *info;
3479
3480 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3481
3482 if (!info) {
3483 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3484 driver_name, adapter_num, port_num));
3485 } else {
3486 tty_port_init(&info->port);
3487 info->port.ops = &slgt_port_ops;
3488 info->magic = MGSL_MAGIC;
3489 INIT_WORK(&info->task, bh_handler);
3490 info->max_frame_size = 4096;
3491 info->base_clock = 14745600;
3492 info->rbuf_fill_level = DMABUFSIZE;
3493 info->port.close_delay = 5*HZ/10;
3494 info->port.closing_wait = 30*HZ;
3495 init_waitqueue_head(&info->status_event_wait_q);
3496 init_waitqueue_head(&info->event_wait_q);
3497 spin_lock_init(&info->netlock);
3498 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3499 info->idle_mode = HDLC_TXIDLE_FLAGS;
3500 info->adapter_num = adapter_num;
3501 info->port_num = port_num;
3502
3503 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3504 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3505
3506 /* Copy configuration info to device instance data */
3507 info->pdev = pdev;
3508 info->irq_level = pdev->irq;
3509 info->phys_reg_addr = pci_resource_start(pdev,0);
3510
3511 info->bus_type = MGSL_BUS_TYPE_PCI;
3512 info->irq_flags = IRQF_SHARED;
3513
3514 info->init_error = -1; /* assume error, set to 0 on successful init */
3515 }
3516
3517 return info;
3518 }
3519
3520 static void device_init(int adapter_num, struct pci_dev *pdev)
3521 {
3522 struct slgt_info *port_array[SLGT_MAX_PORTS];
3523 int i;
3524 int port_count = 1;
3525
3526 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3527 port_count = 2;
3528 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3529 port_count = 4;
3530
3531 /* allocate device instances for all ports */
3532 for (i=0; i < port_count; ++i) {
3533 port_array[i] = alloc_dev(adapter_num, i, pdev);
3534 if (port_array[i] == NULL) {
3535 for (--i; i >= 0; --i)
3536 kfree(port_array[i]);
3537 return;
3538 }
3539 }
3540
3541 /* give copy of port_array to all ports and add to device list */
3542 for (i=0; i < port_count; ++i) {
3543 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3544 add_device(port_array[i]);
3545 port_array[i]->port_count = port_count;
3546 spin_lock_init(&port_array[i]->lock);
3547 }
3548
3549 /* Allocate and claim adapter resources */
3550 if (!claim_resources(port_array[0])) {
3551
3552 alloc_dma_bufs(port_array[0]);
3553
3554 /* copy resource information from first port to others */
3555 for (i = 1; i < port_count; ++i) {
3556 port_array[i]->lock = port_array[0]->lock;
3557 port_array[i]->irq_level = port_array[0]->irq_level;
3558 port_array[i]->reg_addr = port_array[0]->reg_addr;
3559 alloc_dma_bufs(port_array[i]);
3560 }
3561
3562 if (request_irq(port_array[0]->irq_level,
3563 slgt_interrupt,
3564 port_array[0]->irq_flags,
3565 port_array[0]->device_name,
3566 port_array[0]) < 0) {
3567 DBGERR(("%s request_irq failed IRQ=%d\n",
3568 port_array[0]->device_name,
3569 port_array[0]->irq_level));
3570 } else {
3571 port_array[0]->irq_requested = true;
3572 adapter_test(port_array[0]);
3573 for (i=1 ; i < port_count ; i++) {
3574 port_array[i]->init_error = port_array[0]->init_error;
3575 port_array[i]->gpio_present = port_array[0]->gpio_present;
3576 }
3577 }
3578 }
3579
3580 for (i=0; i < port_count; ++i)
3581 tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
3582 }
3583
3584 static int __devinit init_one(struct pci_dev *dev,
3585 const struct pci_device_id *ent)
3586 {
3587 if (pci_enable_device(dev)) {
3588 printk("error enabling pci device %p\n", dev);
3589 return -EIO;
3590 }
3591 pci_set_master(dev);
3592 device_init(slgt_device_count, dev);
3593 return 0;
3594 }
3595
3596 static void __devexit remove_one(struct pci_dev *dev)
3597 {
3598 }
3599
3600 static const struct tty_operations ops = {
3601 .open = open,
3602 .close = close,
3603 .write = write,
3604 .put_char = put_char,
3605 .flush_chars = flush_chars,
3606 .write_room = write_room,
3607 .chars_in_buffer = chars_in_buffer,
3608 .flush_buffer = flush_buffer,
3609 .ioctl = ioctl,
3610 .compat_ioctl = slgt_compat_ioctl,
3611 .throttle = throttle,
3612 .unthrottle = unthrottle,
3613 .send_xchar = send_xchar,
3614 .break_ctl = set_break,
3615 .wait_until_sent = wait_until_sent,
3616 .set_termios = set_termios,
3617 .stop = tx_hold,
3618 .start = tx_release,
3619 .hangup = hangup,
3620 .tiocmget = tiocmget,
3621 .tiocmset = tiocmset,
3622 .proc_fops = &synclink_gt_proc_fops,
3623 };
3624
3625 static void slgt_cleanup(void)
3626 {
3627 int rc;
3628 struct slgt_info *info;
3629 struct slgt_info *tmp;
3630
3631 printk(KERN_INFO "unload %s\n", driver_name);
3632
3633 if (serial_driver) {
3634 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3635 tty_unregister_device(serial_driver, info->line);
3636 if ((rc = tty_unregister_driver(serial_driver)))
3637 DBGERR(("tty_unregister_driver error=%d\n", rc));
3638 put_tty_driver(serial_driver);
3639 }
3640
3641 /* reset devices */
3642 info = slgt_device_list;
3643 while(info) {
3644 reset_port(info);
3645 info = info->next_device;
3646 }
3647
3648 /* release devices */
3649 info = slgt_device_list;
3650 while(info) {
3651 #if SYNCLINK_GENERIC_HDLC
3652 hdlcdev_exit(info);
3653 #endif
3654 free_dma_bufs(info);
3655 free_tmp_rbuf(info);
3656 if (info->port_num == 0)
3657 release_resources(info);
3658 tmp = info;
3659 info = info->next_device;
3660 kfree(tmp);
3661 }
3662
3663 if (pci_registered)
3664 pci_unregister_driver(&pci_driver);
3665 }
3666
3667 /*
3668 * Driver initialization entry point.
3669 */
3670 static int __init slgt_init(void)
3671 {
3672 int rc;
3673
3674 printk(KERN_INFO "%s\n", driver_name);
3675
3676 serial_driver = alloc_tty_driver(MAX_DEVICES);
3677 if (!serial_driver) {
3678 printk("%s can't allocate tty driver\n", driver_name);
3679 return -ENOMEM;
3680 }
3681
3682 /* Initialize the tty_driver structure */
3683
3684 serial_driver->owner = THIS_MODULE;
3685 serial_driver->driver_name = tty_driver_name;
3686 serial_driver->name = tty_dev_prefix;
3687 serial_driver->major = ttymajor;
3688 serial_driver->minor_start = 64;
3689 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3690 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3691 serial_driver->init_termios = tty_std_termios;
3692 serial_driver->init_termios.c_cflag =
3693 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3694 serial_driver->init_termios.c_ispeed = 9600;
3695 serial_driver->init_termios.c_ospeed = 9600;
3696 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3697 tty_set_operations(serial_driver, &ops);
3698 if ((rc = tty_register_driver(serial_driver)) < 0) {
3699 DBGERR(("%s can't register serial driver\n", driver_name));
3700 put_tty_driver(serial_driver);
3701 serial_driver = NULL;
3702 goto error;
3703 }
3704
3705 printk(KERN_INFO "%s, tty major#%d\n",
3706 driver_name, serial_driver->major);
3707
3708 slgt_device_count = 0;
3709 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3710 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3711 goto error;
3712 }
3713 pci_registered = true;
3714
3715 if (!slgt_device_list)
3716 printk("%s no devices found\n",driver_name);
3717
3718 return 0;
3719
3720 error:
3721 slgt_cleanup();
3722 return rc;
3723 }
3724
3725 static void __exit slgt_exit(void)
3726 {
3727 slgt_cleanup();
3728 }
3729
3730 module_init(slgt_init);
3731 module_exit(slgt_exit);
3732
3733 /*
3734 * register access routines
3735 */
3736
3737 #define CALC_REGADDR() \
3738 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3739 if (addr >= 0x80) \
3740 reg_addr += (info->port_num) * 32;
3741
3742 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3743 {
3744 CALC_REGADDR();
3745 return readb((void __iomem *)reg_addr);
3746 }
3747
3748 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3749 {
3750 CALC_REGADDR();
3751 writeb(value, (void __iomem *)reg_addr);
3752 }
3753
3754 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3755 {
3756 CALC_REGADDR();
3757 return readw((void __iomem *)reg_addr);
3758 }
3759
3760 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3761 {
3762 CALC_REGADDR();
3763 writew(value, (void __iomem *)reg_addr);
3764 }
3765
3766 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3767 {
3768 CALC_REGADDR();
3769 return readl((void __iomem *)reg_addr);
3770 }
3771
3772 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3773 {
3774 CALC_REGADDR();
3775 writel(value, (void __iomem *)reg_addr);
3776 }
3777
3778 static void rdma_reset(struct slgt_info *info)
3779 {
3780 unsigned int i;
3781
3782 /* set reset bit */
3783 wr_reg32(info, RDCSR, BIT1);
3784
3785 /* wait for enable bit cleared */
3786 for(i=0 ; i < 1000 ; i++)
3787 if (!(rd_reg32(info, RDCSR) & BIT0))
3788 break;
3789 }
3790
3791 static void tdma_reset(struct slgt_info *info)
3792 {
3793 unsigned int i;
3794
3795 /* set reset bit */
3796 wr_reg32(info, TDCSR, BIT1);
3797
3798 /* wait for enable bit cleared */
3799 for(i=0 ; i < 1000 ; i++)
3800 if (!(rd_reg32(info, TDCSR) & BIT0))
3801 break;
3802 }
3803
3804 /*
3805 * enable internal loopback
3806 * TxCLK and RxCLK are generated from BRG
3807 * and TxD is looped back to RxD internally.
3808 */
3809 static void enable_loopback(struct slgt_info *info)
3810 {
3811 /* SCR (serial control) BIT2=looopback enable */
3812 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3813
3814 if (info->params.mode != MGSL_MODE_ASYNC) {
3815 /* CCR (clock control)
3816 * 07..05 tx clock source (010 = BRG)
3817 * 04..02 rx clock source (010 = BRG)
3818 * 01 auxclk enable (0 = disable)
3819 * 00 BRG enable (1 = enable)
3820 *
3821 * 0100 1001
3822 */
3823 wr_reg8(info, CCR, 0x49);
3824
3825 /* set speed if available, otherwise use default */
3826 if (info->params.clock_speed)
3827 set_rate(info, info->params.clock_speed);
3828 else
3829 set_rate(info, 3686400);
3830 }
3831 }
3832
3833 /*
3834 * set baud rate generator to specified rate
3835 */
3836 static void set_rate(struct slgt_info *info, u32 rate)
3837 {
3838 unsigned int div;
3839 unsigned int osc = info->base_clock;
3840
3841 /* div = osc/rate - 1
3842 *
3843 * Round div up if osc/rate is not integer to
3844 * force to next slowest rate.
3845 */
3846
3847 if (rate) {
3848 div = osc/rate;
3849 if (!(osc % rate) && div)
3850 div--;
3851 wr_reg16(info, BDR, (unsigned short)div);
3852 }
3853 }
3854
3855 static void rx_stop(struct slgt_info *info)
3856 {
3857 unsigned short val;
3858
3859 /* disable and reset receiver */
3860 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3861 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3862 wr_reg16(info, RCR, val); /* clear reset bit */
3863
3864 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3865
3866 /* clear pending rx interrupts */
3867 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3868
3869 rdma_reset(info);
3870
3871 info->rx_enabled = false;
3872 info->rx_restart = false;
3873 }
3874
3875 static void rx_start(struct slgt_info *info)
3876 {
3877 unsigned short val;
3878
3879 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3880
3881 /* clear pending rx overrun IRQ */
3882 wr_reg16(info, SSR, IRQ_RXOVER);
3883
3884 /* reset and disable receiver */
3885 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3886 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3887 wr_reg16(info, RCR, val); /* clear reset bit */
3888
3889 rdma_reset(info);
3890 reset_rbufs(info);
3891
3892 if (info->rx_pio) {
3893 /* rx request when rx FIFO not empty */
3894 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
3895 slgt_irq_on(info, IRQ_RXDATA);
3896 if (info->params.mode == MGSL_MODE_ASYNC) {
3897 /* enable saving of rx status */
3898 wr_reg32(info, RDCSR, BIT6);
3899 }
3900 } else {
3901 /* rx request when rx FIFO half full */
3902 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
3903 /* set 1st descriptor address */
3904 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3905
3906 if (info->params.mode != MGSL_MODE_ASYNC) {
3907 /* enable rx DMA and DMA interrupt */
3908 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3909 } else {
3910 /* enable saving of rx status, rx DMA and DMA interrupt */
3911 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3912 }
3913 }
3914
3915 slgt_irq_on(info, IRQ_RXOVER);
3916
3917 /* enable receiver */
3918 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3919
3920 info->rx_restart = false;
3921 info->rx_enabled = true;
3922 }
3923
3924 static void tx_start(struct slgt_info *info)
3925 {
3926 if (!info->tx_enabled) {
3927 wr_reg16(info, TCR,
3928 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3929 info->tx_enabled = true;
3930 }
3931
3932 if (info->tx_count) {
3933 info->drop_rts_on_tx_done = false;
3934
3935 if (info->params.mode != MGSL_MODE_ASYNC) {
3936 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3937 get_signals(info);
3938 if (!(info->signals & SerialSignal_RTS)) {
3939 info->signals |= SerialSignal_RTS;
3940 set_signals(info);
3941 info->drop_rts_on_tx_done = true;
3942 }
3943 }
3944
3945 slgt_irq_off(info, IRQ_TXDATA);
3946 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3947 /* clear tx idle and underrun status bits */
3948 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3949 if (info->params.mode == MGSL_MODE_HDLC)
3950 mod_timer(&info->tx_timer, jiffies +
3951 msecs_to_jiffies(5000));
3952 } else {
3953 slgt_irq_off(info, IRQ_TXDATA);
3954 slgt_irq_on(info, IRQ_TXIDLE);
3955 /* clear tx idle status bit */
3956 wr_reg16(info, SSR, IRQ_TXIDLE);
3957 }
3958 tdma_start(info);
3959 info->tx_active = true;
3960 }
3961 }
3962
3963 /*
3964 * start transmit DMA if inactive and there are unsent buffers
3965 */
3966 static void tdma_start(struct slgt_info *info)
3967 {
3968 unsigned int i;
3969
3970 if (rd_reg32(info, TDCSR) & BIT0)
3971 return;
3972
3973 /* transmit DMA inactive, check for unsent buffers */
3974 i = info->tbuf_start;
3975 while (!desc_count(info->tbufs[i])) {
3976 if (++i == info->tbuf_count)
3977 i = 0;
3978 if (i == info->tbuf_current)
3979 return;
3980 }
3981 info->tbuf_start = i;
3982
3983 /* there are unsent buffers, start transmit DMA */
3984
3985 /* reset needed if previous error condition */
3986 tdma_reset(info);
3987
3988 /* set 1st descriptor address */
3989 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3990 wr_reg32(info, TDCSR, BIT2 + BIT0); /* IRQ + DMA enable */
3991 }
3992
3993 static void tx_stop(struct slgt_info *info)
3994 {
3995 unsigned short val;
3996
3997 del_timer(&info->tx_timer);
3998
3999 tdma_reset(info);
4000
4001 /* reset and disable transmitter */
4002 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
4003 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
4004
4005 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
4006
4007 /* clear tx idle and underrun status bit */
4008 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4009
4010 reset_tbufs(info);
4011
4012 info->tx_enabled = false;
4013 info->tx_active = false;
4014 }
4015
4016 static void reset_port(struct slgt_info *info)
4017 {
4018 if (!info->reg_addr)
4019 return;
4020
4021 tx_stop(info);
4022 rx_stop(info);
4023
4024 info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4025 set_signals(info);
4026
4027 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4028 }
4029
4030 static void reset_adapter(struct slgt_info *info)
4031 {
4032 int i;
4033 for (i=0; i < info->port_count; ++i) {
4034 if (info->port_array[i])
4035 reset_port(info->port_array[i]);
4036 }
4037 }
4038
4039 static void async_mode(struct slgt_info *info)
4040 {
4041 unsigned short val;
4042
4043 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4044 tx_stop(info);
4045 rx_stop(info);
4046
4047 /* TCR (tx control)
4048 *
4049 * 15..13 mode, 010=async
4050 * 12..10 encoding, 000=NRZ
4051 * 09 parity enable
4052 * 08 1=odd parity, 0=even parity
4053 * 07 1=RTS driver control
4054 * 06 1=break enable
4055 * 05..04 character length
4056 * 00=5 bits
4057 * 01=6 bits
4058 * 10=7 bits
4059 * 11=8 bits
4060 * 03 0=1 stop bit, 1=2 stop bits
4061 * 02 reset
4062 * 01 enable
4063 * 00 auto-CTS enable
4064 */
4065 val = 0x4000;
4066
4067 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4068 val |= BIT7;
4069
4070 if (info->params.parity != ASYNC_PARITY_NONE) {
4071 val |= BIT9;
4072 if (info->params.parity == ASYNC_PARITY_ODD)
4073 val |= BIT8;
4074 }
4075
4076 switch (info->params.data_bits)
4077 {
4078 case 6: val |= BIT4; break;
4079 case 7: val |= BIT5; break;
4080 case 8: val |= BIT5 + BIT4; break;
4081 }
4082
4083 if (info->params.stop_bits != 1)
4084 val |= BIT3;
4085
4086 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4087 val |= BIT0;
4088
4089 wr_reg16(info, TCR, val);
4090
4091 /* RCR (rx control)
4092 *
4093 * 15..13 mode, 010=async
4094 * 12..10 encoding, 000=NRZ
4095 * 09 parity enable
4096 * 08 1=odd parity, 0=even parity
4097 * 07..06 reserved, must be 0
4098 * 05..04 character length
4099 * 00=5 bits
4100 * 01=6 bits
4101 * 10=7 bits
4102 * 11=8 bits
4103 * 03 reserved, must be zero
4104 * 02 reset
4105 * 01 enable
4106 * 00 auto-DCD enable
4107 */
4108 val = 0x4000;
4109
4110 if (info->params.parity != ASYNC_PARITY_NONE) {
4111 val |= BIT9;
4112 if (info->params.parity == ASYNC_PARITY_ODD)
4113 val |= BIT8;
4114 }
4115
4116 switch (info->params.data_bits)
4117 {
4118 case 6: val |= BIT4; break;
4119 case 7: val |= BIT5; break;
4120 case 8: val |= BIT5 + BIT4; break;
4121 }
4122
4123 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4124 val |= BIT0;
4125
4126 wr_reg16(info, RCR, val);
4127
4128 /* CCR (clock control)
4129 *
4130 * 07..05 011 = tx clock source is BRG/16
4131 * 04..02 010 = rx clock source is BRG
4132 * 01 0 = auxclk disabled
4133 * 00 1 = BRG enabled
4134 *
4135 * 0110 1001
4136 */
4137 wr_reg8(info, CCR, 0x69);
4138
4139 msc_set_vcr(info);
4140
4141 /* SCR (serial control)
4142 *
4143 * 15 1=tx req on FIFO half empty
4144 * 14 1=rx req on FIFO half full
4145 * 13 tx data IRQ enable
4146 * 12 tx idle IRQ enable
4147 * 11 rx break on IRQ enable
4148 * 10 rx data IRQ enable
4149 * 09 rx break off IRQ enable
4150 * 08 overrun IRQ enable
4151 * 07 DSR IRQ enable
4152 * 06 CTS IRQ enable
4153 * 05 DCD IRQ enable
4154 * 04 RI IRQ enable
4155 * 03 0=16x sampling, 1=8x sampling
4156 * 02 1=txd->rxd internal loopback enable
4157 * 01 reserved, must be zero
4158 * 00 1=master IRQ enable
4159 */
4160 val = BIT15 + BIT14 + BIT0;
4161 /* JCR[8] : 1 = x8 async mode feature available */
4162 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4163 ((info->base_clock < (info->params.data_rate * 16)) ||
4164 (info->base_clock % (info->params.data_rate * 16)))) {
4165 /* use 8x sampling */
4166 val |= BIT3;
4167 set_rate(info, info->params.data_rate * 8);
4168 } else {
4169 /* use 16x sampling */
4170 set_rate(info, info->params.data_rate * 16);
4171 }
4172 wr_reg16(info, SCR, val);
4173
4174 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4175
4176 if (info->params.loopback)
4177 enable_loopback(info);
4178 }
4179
4180 static void sync_mode(struct slgt_info *info)
4181 {
4182 unsigned short val;
4183
4184 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4185 tx_stop(info);
4186 rx_stop(info);
4187
4188 /* TCR (tx control)
4189 *
4190 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4191 * 12..10 encoding
4192 * 09 CRC enable
4193 * 08 CRC32
4194 * 07 1=RTS driver control
4195 * 06 preamble enable
4196 * 05..04 preamble length
4197 * 03 share open/close flag
4198 * 02 reset
4199 * 01 enable
4200 * 00 auto-CTS enable
4201 */
4202 val = BIT2;
4203
4204 switch(info->params.mode) {
4205 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4206 case MGSL_MODE_BISYNC: val |= BIT15; break;
4207 case MGSL_MODE_RAW: val |= BIT13; break;
4208 }
4209 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4210 val |= BIT7;
4211
4212 switch(info->params.encoding)
4213 {
4214 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4215 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4216 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4217 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4218 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4219 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4220 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4221 }
4222
4223 switch (info->params.crc_type & HDLC_CRC_MASK)
4224 {
4225 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4226 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4227 }
4228
4229 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4230 val |= BIT6;
4231
4232 switch (info->params.preamble_length)
4233 {
4234 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4235 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4236 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4237 }
4238
4239 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4240 val |= BIT0;
4241
4242 wr_reg16(info, TCR, val);
4243
4244 /* TPR (transmit preamble) */
4245
4246 switch (info->params.preamble)
4247 {
4248 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4249 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4250 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4251 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4252 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4253 default: val = 0x7e; break;
4254 }
4255 wr_reg8(info, TPR, (unsigned char)val);
4256
4257 /* RCR (rx control)
4258 *
4259 * 15..13 mode, 000=HDLC 001=raw 010=async 011=monosync 100=bisync
4260 * 12..10 encoding
4261 * 09 CRC enable
4262 * 08 CRC32
4263 * 07..03 reserved, must be 0
4264 * 02 reset
4265 * 01 enable
4266 * 00 auto-DCD enable
4267 */
4268 val = 0;
4269
4270 switch(info->params.mode) {
4271 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4272 case MGSL_MODE_BISYNC: val |= BIT15; break;
4273 case MGSL_MODE_RAW: val |= BIT13; break;
4274 }
4275
4276 switch(info->params.encoding)
4277 {
4278 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4279 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4280 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4281 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4282 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4283 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4284 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4285 }
4286
4287 switch (info->params.crc_type & HDLC_CRC_MASK)
4288 {
4289 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4290 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4291 }
4292
4293 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4294 val |= BIT0;
4295
4296 wr_reg16(info, RCR, val);
4297
4298 /* CCR (clock control)
4299 *
4300 * 07..05 tx clock source
4301 * 04..02 rx clock source
4302 * 01 auxclk enable
4303 * 00 BRG enable
4304 */
4305 val = 0;
4306
4307 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4308 {
4309 // when RxC source is DPLL, BRG generates 16X DPLL
4310 // reference clock, so take TxC from BRG/16 to get
4311 // transmit clock at actual data rate
4312 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4313 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4314 else
4315 val |= BIT6; /* 010, txclk = BRG */
4316 }
4317 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4318 val |= BIT7; /* 100, txclk = DPLL Input */
4319 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4320 val |= BIT5; /* 001, txclk = RXC Input */
4321
4322 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4323 val |= BIT3; /* 010, rxclk = BRG */
4324 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4325 val |= BIT4; /* 100, rxclk = DPLL */
4326 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4327 val |= BIT2; /* 001, rxclk = TXC Input */
4328
4329 if (info->params.clock_speed)
4330 val |= BIT1 + BIT0;
4331
4332 wr_reg8(info, CCR, (unsigned char)val);
4333
4334 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4335 {
4336 // program DPLL mode
4337 switch(info->params.encoding)
4338 {
4339 case HDLC_ENCODING_BIPHASE_MARK:
4340 case HDLC_ENCODING_BIPHASE_SPACE:
4341 val = BIT7; break;
4342 case HDLC_ENCODING_BIPHASE_LEVEL:
4343 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4344 val = BIT7 + BIT6; break;
4345 default: val = BIT6; // NRZ encodings
4346 }
4347 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4348
4349 // DPLL requires a 16X reference clock from BRG
4350 set_rate(info, info->params.clock_speed * 16);
4351 }
4352 else
4353 set_rate(info, info->params.clock_speed);
4354
4355 tx_set_idle(info);
4356
4357 msc_set_vcr(info);
4358
4359 /* SCR (serial control)
4360 *
4361 * 15 1=tx req on FIFO half empty
4362 * 14 1=rx req on FIFO half full
4363 * 13 tx data IRQ enable
4364 * 12 tx idle IRQ enable
4365 * 11 underrun IRQ enable
4366 * 10 rx data IRQ enable
4367 * 09 rx idle IRQ enable
4368 * 08 overrun IRQ enable
4369 * 07 DSR IRQ enable
4370 * 06 CTS IRQ enable
4371 * 05 DCD IRQ enable
4372 * 04 RI IRQ enable
4373 * 03 reserved, must be zero
4374 * 02 1=txd->rxd internal loopback enable
4375 * 01 reserved, must be zero
4376 * 00 1=master IRQ enable
4377 */
4378 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4379
4380 if (info->params.loopback)
4381 enable_loopback(info);
4382 }
4383
4384 /*
4385 * set transmit idle mode
4386 */
4387 static void tx_set_idle(struct slgt_info *info)
4388 {
4389 unsigned char val;
4390 unsigned short tcr;
4391
4392 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4393 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4394 */
4395 tcr = rd_reg16(info, TCR);
4396 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4397 /* disable preamble, set idle size to 16 bits */
4398 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4399 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4400 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4401 } else if (!(tcr & BIT6)) {
4402 /* preamble is disabled, set idle size to 8 bits */
4403 tcr &= ~(BIT5 + BIT4);
4404 }
4405 wr_reg16(info, TCR, tcr);
4406
4407 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4408 /* LSB of custom tx idle specified in tx idle register */
4409 val = (unsigned char)(info->idle_mode & 0xff);
4410 } else {
4411 /* standard 8 bit idle patterns */
4412 switch(info->idle_mode)
4413 {
4414 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4415 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4416 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4417 case HDLC_TXIDLE_ZEROS:
4418 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4419 default: val = 0xff;
4420 }
4421 }
4422
4423 wr_reg8(info, TIR, val);
4424 }
4425
4426 /*
4427 * get state of V24 status (input) signals
4428 */
4429 static void get_signals(struct slgt_info *info)
4430 {
4431 unsigned short status = rd_reg16(info, SSR);
4432
4433 /* clear all serial signals except DTR and RTS */
4434 info->signals &= SerialSignal_DTR + SerialSignal_RTS;
4435
4436 if (status & BIT3)
4437 info->signals |= SerialSignal_DSR;
4438 if (status & BIT2)
4439 info->signals |= SerialSignal_CTS;
4440 if (status & BIT1)
4441 info->signals |= SerialSignal_DCD;
4442 if (status & BIT0)
4443 info->signals |= SerialSignal_RI;
4444 }
4445
4446 /*
4447 * set V.24 Control Register based on current configuration
4448 */
4449 static void msc_set_vcr(struct slgt_info *info)
4450 {
4451 unsigned char val = 0;
4452
4453 /* VCR (V.24 control)
4454 *
4455 * 07..04 serial IF select
4456 * 03 DTR
4457 * 02 RTS
4458 * 01 LL
4459 * 00 RL
4460 */
4461
4462 switch(info->if_mode & MGSL_INTERFACE_MASK)
4463 {
4464 case MGSL_INTERFACE_RS232:
4465 val |= BIT5; /* 0010 */
4466 break;
4467 case MGSL_INTERFACE_V35:
4468 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4469 break;
4470 case MGSL_INTERFACE_RS422:
4471 val |= BIT6; /* 0100 */
4472 break;
4473 }
4474
4475 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4476 val |= BIT4;
4477 if (info->signals & SerialSignal_DTR)
4478 val |= BIT3;
4479 if (info->signals & SerialSignal_RTS)
4480 val |= BIT2;
4481 if (info->if_mode & MGSL_INTERFACE_LL)
4482 val |= BIT1;
4483 if (info->if_mode & MGSL_INTERFACE_RL)
4484 val |= BIT0;
4485 wr_reg8(info, VCR, val);
4486 }
4487
4488 /*
4489 * set state of V24 control (output) signals
4490 */
4491 static void set_signals(struct slgt_info *info)
4492 {
4493 unsigned char val = rd_reg8(info, VCR);
4494 if (info->signals & SerialSignal_DTR)
4495 val |= BIT3;
4496 else
4497 val &= ~BIT3;
4498 if (info->signals & SerialSignal_RTS)
4499 val |= BIT2;
4500 else
4501 val &= ~BIT2;
4502 wr_reg8(info, VCR, val);
4503 }
4504
4505 /*
4506 * free range of receive DMA buffers (i to last)
4507 */
4508 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4509 {
4510 int done = 0;
4511
4512 while(!done) {
4513 /* reset current buffer for reuse */
4514 info->rbufs[i].status = 0;
4515 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4516 if (i == last)
4517 done = 1;
4518 if (++i == info->rbuf_count)
4519 i = 0;
4520 }
4521 info->rbuf_current = i;
4522 }
4523
4524 /*
4525 * mark all receive DMA buffers as free
4526 */
4527 static void reset_rbufs(struct slgt_info *info)
4528 {
4529 free_rbufs(info, 0, info->rbuf_count - 1);
4530 info->rbuf_fill_index = 0;
4531 info->rbuf_fill_count = 0;
4532 }
4533
4534 /*
4535 * pass receive HDLC frame to upper layer
4536 *
4537 * return true if frame available, otherwise false
4538 */
4539 static bool rx_get_frame(struct slgt_info *info)
4540 {
4541 unsigned int start, end;
4542 unsigned short status;
4543 unsigned int framesize = 0;
4544 unsigned long flags;
4545 struct tty_struct *tty = info->port.tty;
4546 unsigned char addr_field = 0xff;
4547 unsigned int crc_size = 0;
4548
4549 switch (info->params.crc_type & HDLC_CRC_MASK) {
4550 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4551 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4552 }
4553
4554 check_again:
4555
4556 framesize = 0;
4557 addr_field = 0xff;
4558 start = end = info->rbuf_current;
4559
4560 for (;;) {
4561 if (!desc_complete(info->rbufs[end]))
4562 goto cleanup;
4563
4564 if (framesize == 0 && info->params.addr_filter != 0xff)
4565 addr_field = info->rbufs[end].buf[0];
4566
4567 framesize += desc_count(info->rbufs[end]);
4568
4569 if (desc_eof(info->rbufs[end]))
4570 break;
4571
4572 if (++end == info->rbuf_count)
4573 end = 0;
4574
4575 if (end == info->rbuf_current) {
4576 if (info->rx_enabled){
4577 spin_lock_irqsave(&info->lock,flags);
4578 rx_start(info);
4579 spin_unlock_irqrestore(&info->lock,flags);
4580 }
4581 goto cleanup;
4582 }
4583 }
4584
4585 /* status
4586 *
4587 * 15 buffer complete
4588 * 14..06 reserved
4589 * 05..04 residue
4590 * 02 eof (end of frame)
4591 * 01 CRC error
4592 * 00 abort
4593 */
4594 status = desc_status(info->rbufs[end]);
4595
4596 /* ignore CRC bit if not using CRC (bit is undefined) */
4597 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4598 status &= ~BIT1;
4599
4600 if (framesize == 0 ||
4601 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4602 free_rbufs(info, start, end);
4603 goto check_again;
4604 }
4605
4606 if (framesize < (2 + crc_size) || status & BIT0) {
4607 info->icount.rxshort++;
4608 framesize = 0;
4609 } else if (status & BIT1) {
4610 info->icount.rxcrc++;
4611 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4612 framesize = 0;
4613 }
4614
4615 #if SYNCLINK_GENERIC_HDLC
4616 if (framesize == 0) {
4617 info->netdev->stats.rx_errors++;
4618 info->netdev->stats.rx_frame_errors++;
4619 }
4620 #endif
4621
4622 DBGBH(("%s rx frame status=%04X size=%d\n",
4623 info->device_name, status, framesize));
4624 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4625
4626 if (framesize) {
4627 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4628 framesize -= crc_size;
4629 crc_size = 0;
4630 }
4631
4632 if (framesize > info->max_frame_size + crc_size)
4633 info->icount.rxlong++;
4634 else {
4635 /* copy dma buffer(s) to contiguous temp buffer */
4636 int copy_count = framesize;
4637 int i = start;
4638 unsigned char *p = info->tmp_rbuf;
4639 info->tmp_rbuf_count = framesize;
4640
4641 info->icount.rxok++;
4642
4643 while(copy_count) {
4644 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4645 memcpy(p, info->rbufs[i].buf, partial_count);
4646 p += partial_count;
4647 copy_count -= partial_count;
4648 if (++i == info->rbuf_count)
4649 i = 0;
4650 }
4651
4652 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4653 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4654 framesize++;
4655 }
4656
4657 #if SYNCLINK_GENERIC_HDLC
4658 if (info->netcount)
4659 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4660 else
4661 #endif
4662 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4663 }
4664 }
4665 free_rbufs(info, start, end);
4666 return true;
4667
4668 cleanup:
4669 return false;
4670 }
4671
4672 /*
4673 * pass receive buffer (RAW synchronous mode) to tty layer
4674 * return true if buffer available, otherwise false
4675 */
4676 static bool rx_get_buf(struct slgt_info *info)
4677 {
4678 unsigned int i = info->rbuf_current;
4679 unsigned int count;
4680
4681 if (!desc_complete(info->rbufs[i]))
4682 return false;
4683 count = desc_count(info->rbufs[i]);
4684 switch(info->params.mode) {
4685 case MGSL_MODE_MONOSYNC:
4686 case MGSL_MODE_BISYNC:
4687 /* ignore residue in byte synchronous modes */
4688 if (desc_residue(info->rbufs[i]))
4689 count--;
4690 break;
4691 }
4692 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4693 DBGINFO(("rx_get_buf size=%d\n", count));
4694 if (count)
4695 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4696 info->flag_buf, count);
4697 free_rbufs(info, i, i);
4698 return true;
4699 }
4700
4701 static void reset_tbufs(struct slgt_info *info)
4702 {
4703 unsigned int i;
4704 info->tbuf_current = 0;
4705 for (i=0 ; i < info->tbuf_count ; i++) {
4706 info->tbufs[i].status = 0;
4707 info->tbufs[i].count = 0;
4708 }
4709 }
4710
4711 /*
4712 * return number of free transmit DMA buffers
4713 */
4714 static unsigned int free_tbuf_count(struct slgt_info *info)
4715 {
4716 unsigned int count = 0;
4717 unsigned int i = info->tbuf_current;
4718
4719 do
4720 {
4721 if (desc_count(info->tbufs[i]))
4722 break; /* buffer in use */
4723 ++count;
4724 if (++i == info->tbuf_count)
4725 i=0;
4726 } while (i != info->tbuf_current);
4727
4728 /* if tx DMA active, last zero count buffer is in use */
4729 if (count && (rd_reg32(info, TDCSR) & BIT0))
4730 --count;
4731
4732 return count;
4733 }
4734
4735 /*
4736 * return number of bytes in unsent transmit DMA buffers
4737 * and the serial controller tx FIFO
4738 */
4739 static unsigned int tbuf_bytes(struct slgt_info *info)
4740 {
4741 unsigned int total_count = 0;
4742 unsigned int i = info->tbuf_current;
4743 unsigned int reg_value;
4744 unsigned int count;
4745 unsigned int active_buf_count = 0;
4746
4747 /*
4748 * Add descriptor counts for all tx DMA buffers.
4749 * If count is zero (cleared by DMA controller after read),
4750 * the buffer is complete or is actively being read from.
4751 *
4752 * Record buf_count of last buffer with zero count starting
4753 * from current ring position. buf_count is mirror
4754 * copy of count and is not cleared by serial controller.
4755 * If DMA controller is active, that buffer is actively
4756 * being read so add to total.
4757 */
4758 do {
4759 count = desc_count(info->tbufs[i]);
4760 if (count)
4761 total_count += count;
4762 else if (!total_count)
4763 active_buf_count = info->tbufs[i].buf_count;
4764 if (++i == info->tbuf_count)
4765 i = 0;
4766 } while (i != info->tbuf_current);
4767
4768 /* read tx DMA status register */
4769 reg_value = rd_reg32(info, TDCSR);
4770
4771 /* if tx DMA active, last zero count buffer is in use */
4772 if (reg_value & BIT0)
4773 total_count += active_buf_count;
4774
4775 /* add tx FIFO count = reg_value[15..8] */
4776 total_count += (reg_value >> 8) & 0xff;
4777
4778 /* if transmitter active add one byte for shift register */
4779 if (info->tx_active)
4780 total_count++;
4781
4782 return total_count;
4783 }
4784
4785 /*
4786 * load transmit DMA buffer(s) with data
4787 */
4788 static void tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4789 {
4790 unsigned short count;
4791 unsigned int i;
4792 struct slgt_desc *d;
4793
4794 if (size == 0)
4795 return;
4796
4797 DBGDATA(info, buf, size, "tx");
4798
4799 info->tbuf_start = i = info->tbuf_current;
4800
4801 while (size) {
4802 d = &info->tbufs[i];
4803 if (++i == info->tbuf_count)
4804 i = 0;
4805
4806 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4807 memcpy(d->buf, buf, count);
4808
4809 size -= count;
4810 buf += count;
4811
4812 /*
4813 * set EOF bit for last buffer of HDLC frame or
4814 * for every buffer in raw mode
4815 */
4816 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4817 info->params.mode == MGSL_MODE_RAW)
4818 set_desc_eof(*d, 1);
4819 else
4820 set_desc_eof(*d, 0);
4821
4822 set_desc_count(*d, count);
4823 d->buf_count = count;
4824 }
4825
4826 info->tbuf_current = i;
4827 }
4828
4829 static int register_test(struct slgt_info *info)
4830 {
4831 static unsigned short patterns[] =
4832 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4833 static unsigned int count = sizeof(patterns)/sizeof(patterns[0]);
4834 unsigned int i;
4835 int rc = 0;
4836
4837 for (i=0 ; i < count ; i++) {
4838 wr_reg16(info, TIR, patterns[i]);
4839 wr_reg16(info, BDR, patterns[(i+1)%count]);
4840 if ((rd_reg16(info, TIR) != patterns[i]) ||
4841 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4842 rc = -ENODEV;
4843 break;
4844 }
4845 }
4846 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4847 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4848 return rc;
4849 }
4850
4851 static int irq_test(struct slgt_info *info)
4852 {
4853 unsigned long timeout;
4854 unsigned long flags;
4855 struct tty_struct *oldtty = info->port.tty;
4856 u32 speed = info->params.data_rate;
4857
4858 info->params.data_rate = 921600;
4859 info->port.tty = NULL;
4860
4861 spin_lock_irqsave(&info->lock, flags);
4862 async_mode(info);
4863 slgt_irq_on(info, IRQ_TXIDLE);
4864
4865 /* enable transmitter */
4866 wr_reg16(info, TCR,
4867 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4868
4869 /* write one byte and wait for tx idle */
4870 wr_reg16(info, TDR, 0);
4871
4872 /* assume failure */
4873 info->init_error = DiagStatus_IrqFailure;
4874 info->irq_occurred = false;
4875
4876 spin_unlock_irqrestore(&info->lock, flags);
4877
4878 timeout=100;
4879 while(timeout-- && !info->irq_occurred)
4880 msleep_interruptible(10);
4881
4882 spin_lock_irqsave(&info->lock,flags);
4883 reset_port(info);
4884 spin_unlock_irqrestore(&info->lock,flags);
4885
4886 info->params.data_rate = speed;
4887 info->port.tty = oldtty;
4888
4889 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4890 return info->irq_occurred ? 0 : -ENODEV;
4891 }
4892
4893 static int loopback_test_rx(struct slgt_info *info)
4894 {
4895 unsigned char *src, *dest;
4896 int count;
4897
4898 if (desc_complete(info->rbufs[0])) {
4899 count = desc_count(info->rbufs[0]);
4900 src = info->rbufs[0].buf;
4901 dest = info->tmp_rbuf;
4902
4903 for( ; count ; count-=2, src+=2) {
4904 /* src=data byte (src+1)=status byte */
4905 if (!(*(src+1) & (BIT9 + BIT8))) {
4906 *dest = *src;
4907 dest++;
4908 info->tmp_rbuf_count++;
4909 }
4910 }
4911 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4912 return 1;
4913 }
4914 return 0;
4915 }
4916
4917 static int loopback_test(struct slgt_info *info)
4918 {
4919 #define TESTFRAMESIZE 20
4920
4921 unsigned long timeout;
4922 u16 count = TESTFRAMESIZE;
4923 unsigned char buf[TESTFRAMESIZE];
4924 int rc = -ENODEV;
4925 unsigned long flags;
4926
4927 struct tty_struct *oldtty = info->port.tty;
4928 MGSL_PARAMS params;
4929
4930 memcpy(&params, &info->params, sizeof(params));
4931
4932 info->params.mode = MGSL_MODE_ASYNC;
4933 info->params.data_rate = 921600;
4934 info->params.loopback = 1;
4935 info->port.tty = NULL;
4936
4937 /* build and send transmit frame */
4938 for (count = 0; count < TESTFRAMESIZE; ++count)
4939 buf[count] = (unsigned char)count;
4940
4941 info->tmp_rbuf_count = 0;
4942 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4943
4944 /* program hardware for HDLC and enabled receiver */
4945 spin_lock_irqsave(&info->lock,flags);
4946 async_mode(info);
4947 rx_start(info);
4948 info->tx_count = count;
4949 tx_load(info, buf, count);
4950 tx_start(info);
4951 spin_unlock_irqrestore(&info->lock, flags);
4952
4953 /* wait for receive complete */
4954 for (timeout = 100; timeout; --timeout) {
4955 msleep_interruptible(10);
4956 if (loopback_test_rx(info)) {
4957 rc = 0;
4958 break;
4959 }
4960 }
4961
4962 /* verify received frame length and contents */
4963 if (!rc && (info->tmp_rbuf_count != count ||
4964 memcmp(buf, info->tmp_rbuf, count))) {
4965 rc = -ENODEV;
4966 }
4967
4968 spin_lock_irqsave(&info->lock,flags);
4969 reset_adapter(info);
4970 spin_unlock_irqrestore(&info->lock,flags);
4971
4972 memcpy(&info->params, &params, sizeof(info->params));
4973 info->port.tty = oldtty;
4974
4975 info->init_error = rc ? DiagStatus_DmaFailure : 0;
4976 return rc;
4977 }
4978
4979 static int adapter_test(struct slgt_info *info)
4980 {
4981 DBGINFO(("testing %s\n", info->device_name));
4982 if (register_test(info) < 0) {
4983 printk("register test failure %s addr=%08X\n",
4984 info->device_name, info->phys_reg_addr);
4985 } else if (irq_test(info) < 0) {
4986 printk("IRQ test failure %s IRQ=%d\n",
4987 info->device_name, info->irq_level);
4988 } else if (loopback_test(info) < 0) {
4989 printk("loopback test failure %s\n", info->device_name);
4990 }
4991 return info->init_error;
4992 }
4993
4994 /*
4995 * transmit timeout handler
4996 */
4997 static void tx_timeout(unsigned long context)
4998 {
4999 struct slgt_info *info = (struct slgt_info*)context;
5000 unsigned long flags;
5001
5002 DBGINFO(("%s tx_timeout\n", info->device_name));
5003 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5004 info->icount.txtimeout++;
5005 }
5006 spin_lock_irqsave(&info->lock,flags);
5007 info->tx_active = false;
5008 info->tx_count = 0;
5009 spin_unlock_irqrestore(&info->lock,flags);
5010
5011 #if SYNCLINK_GENERIC_HDLC
5012 if (info->netcount)
5013 hdlcdev_tx_done(info);
5014 else
5015 #endif
5016 bh_transmit(info);
5017 }
5018
5019 /*
5020 * receive buffer polling timer
5021 */
5022 static void rx_timeout(unsigned long context)
5023 {
5024 struct slgt_info *info = (struct slgt_info*)context;
5025 unsigned long flags;
5026
5027 DBGINFO(("%s rx_timeout\n", info->device_name));
5028 spin_lock_irqsave(&info->lock, flags);
5029 info->pending_bh |= BH_RECEIVE;
5030 spin_unlock_irqrestore(&info->lock, flags);
5031 bh_handler(&info->task);
5032 }
5033
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree