1 /*
2 * linux/drivers/char/pcmcia/synclink_cs.c
3 *
4 * $Id: synclink_cs.c,v 4.34 2005/09/08 13:20:54 paulkf Exp $
5 *
6 * Device driver for Microgate SyncLink PC Card
7 * multiprotocol serial adapter.
8 *
9 * written by Paul Fulghum for Microgate Corporation
10 * paulkf@microgate.com
11 *
12 * Microgate and SyncLink are trademarks of Microgate Corporation
13 *
14 * This code is released under the GNU General Public License (GPL)
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
30 #if defined(__i386__)
31 # define BREAKPOINT() asm(" int $3");
32 #else
33 # define BREAKPOINT() { }
34 #endif
35
36 #define MAX_DEVICE_COUNT 4
37
38 #include <linux/module.h>
39 #include <linux/errno.h>
40 #include <linux/signal.h>
41 #include <linux/sched.h>
42 #include <linux/timer.h>
43 #include <linux/time.h>
44 #include <linux/interrupt.h>
45 #include <linux/tty.h>
46 #include <linux/tty_flip.h>
47 #include <linux/serial.h>
48 #include <linux/major.h>
49 #include <linux/string.h>
50 #include <linux/fcntl.h>
51 #include <linux/ptrace.h>
52 #include <linux/ioport.h>
53 #include <linux/mm.h>
54 #include <linux/slab.h>
55 #include <linux/netdevice.h>
56 #include <linux/vmalloc.h>
57 #include <linux/init.h>
58 #include <linux/delay.h>
59 #include <linux/ioctl.h>
60 #include <linux/synclink.h>
61
62 #include <asm/system.h>
63 #include <asm/io.h>
64 #include <asm/irq.h>
65 #include <asm/dma.h>
66 #include <linux/bitops.h>
67 #include <asm/types.h>
68 #include <linux/termios.h>
69 #include <linux/workqueue.h>
70 #include <linux/hdlc.h>
71
72 #include <pcmcia/cs_types.h>
73 #include <pcmcia/cs.h>
74 #include <pcmcia/cistpl.h>
75 #include <pcmcia/cisreg.h>
76 #include <pcmcia/ds.h>
77
78 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_CS_MODULE))
79 #define SYNCLINK_GENERIC_HDLC 1
80 #else
81 #define SYNCLINK_GENERIC_HDLC 0
82 #endif
83
84 #define GET_USER(error,value,addr) error = get_user(value,addr)
85 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
86 #define PUT_USER(error,value,addr) error = put_user(value,addr)
87 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
88
89 #include <asm/uaccess.h>
90
91 static MGSL_PARAMS default_params = {
92 MGSL_MODE_HDLC, /* unsigned long mode */
93 0, /* unsigned char loopback; */
94 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
95 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
96 0, /* unsigned long clock_speed; */
97 0xff, /* unsigned char addr_filter; */
98 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
99 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
100 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
101 9600, /* unsigned long data_rate; */
102 8, /* unsigned char data_bits; */
103 1, /* unsigned char stop_bits; */
104 ASYNC_PARITY_NONE /* unsigned char parity; */
105 };
106
107 typedef struct
108 {
109 int count;
110 unsigned char status;
111 char data[1];
112 } RXBUF;
113
114 /* The queue of BH actions to be performed */
115
116 #define BH_RECEIVE 1
117 #define BH_TRANSMIT 2
118 #define BH_STATUS 4
119
120 #define IO_PIN_SHUTDOWN_LIMIT 100
121
122 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
123
124 struct _input_signal_events {
125 int ri_up;
126 int ri_down;
127 int dsr_up;
128 int dsr_down;
129 int dcd_up;
130 int dcd_down;
131 int cts_up;
132 int cts_down;
133 };
134
135
136 /*
137 * Device instance data structure
138 */
139
140 typedef struct _mgslpc_info {
141 struct tty_port port;
142 void *if_ptr; /* General purpose pointer (used by SPPP) */
143 int magic;
144 int line;
145
146 struct mgsl_icount icount;
147
148 int timeout;
149 int x_char; /* xon/xoff character */
150 unsigned char read_status_mask;
151 unsigned char ignore_status_mask;
152
153 unsigned char *tx_buf;
154 int tx_put;
155 int tx_get;
156 int tx_count;
157
158 /* circular list of fixed length rx buffers */
159
160 unsigned char *rx_buf; /* memory allocated for all rx buffers */
161 int rx_buf_total_size; /* size of memory allocated for rx buffers */
162 int rx_put; /* index of next empty rx buffer */
163 int rx_get; /* index of next full rx buffer */
164 int rx_buf_size; /* size in bytes of single rx buffer */
165 int rx_buf_count; /* total number of rx buffers */
166 int rx_frame_count; /* number of full rx buffers */
167
168 wait_queue_head_t status_event_wait_q;
169 wait_queue_head_t event_wait_q;
170 struct timer_list tx_timer; /* HDLC transmit timeout timer */
171 struct _mgslpc_info *next_device; /* device list link */
172
173 unsigned short imra_value;
174 unsigned short imrb_value;
175 unsigned char pim_value;
176
177 spinlock_t lock;
178 struct work_struct task; /* task structure for scheduling bh */
179
180 u32 max_frame_size;
181
182 u32 pending_bh;
183
184 bool bh_running;
185 bool bh_requested;
186
187 int dcd_chkcount; /* check counts to prevent */
188 int cts_chkcount; /* too many IRQs if a signal */
189 int dsr_chkcount; /* is floating */
190 int ri_chkcount;
191
192 bool rx_enabled;
193 bool rx_overflow;
194
195 bool tx_enabled;
196 bool tx_active;
197 bool tx_aborting;
198 u32 idle_mode;
199
200 int if_mode; /* serial interface selection (RS-232, v.35 etc) */
201
202 char device_name[25]; /* device instance name */
203
204 unsigned int io_base; /* base I/O address of adapter */
205 unsigned int irq_level;
206
207 MGSL_PARAMS params; /* communications parameters */
208
209 unsigned char serial_signals; /* current serial signal states */
210
211 bool irq_occurred; /* for diagnostics use */
212 char testing_irq;
213 unsigned int init_error; /* startup error (DIAGS) */
214
215 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
216 bool drop_rts_on_tx_done;
217
218 struct _input_signal_events input_signal_events;
219
220 /* PCMCIA support */
221 struct pcmcia_device *p_dev;
222 dev_node_t node;
223 int stop;
224
225 /* SPPP/Cisco HDLC device parts */
226 int netcount;
227 spinlock_t netlock;
228
229 #if SYNCLINK_GENERIC_HDLC
230 struct net_device *netdev;
231 #endif
232
233 } MGSLPC_INFO;
234
235 #define MGSLPC_MAGIC 0x5402
236
237 /*
238 * The size of the serial xmit buffer is 1 page, or 4096 bytes
239 */
240 #define TXBUFSIZE 4096
241
242
243 #define CHA 0x00 /* channel A offset */
244 #define CHB 0x40 /* channel B offset */
245
246 /*
247 * FIXME: PPC has PVR defined in asm/reg.h. For now we just undef it.
248 */
249 #undef PVR
250
251 #define RXFIFO 0
252 #define TXFIFO 0
253 #define STAR 0x20
254 #define CMDR 0x20
255 #define RSTA 0x21
256 #define PRE 0x21
257 #define MODE 0x22
258 #define TIMR 0x23
259 #define XAD1 0x24
260 #define XAD2 0x25
261 #define RAH1 0x26
262 #define RAH2 0x27
263 #define DAFO 0x27
264 #define RAL1 0x28
265 #define RFC 0x28
266 #define RHCR 0x29
267 #define RAL2 0x29
268 #define RBCL 0x2a
269 #define XBCL 0x2a
270 #define RBCH 0x2b
271 #define XBCH 0x2b
272 #define CCR0 0x2c
273 #define CCR1 0x2d
274 #define CCR2 0x2e
275 #define CCR3 0x2f
276 #define VSTR 0x34
277 #define BGR 0x34
278 #define RLCR 0x35
279 #define AML 0x36
280 #define AMH 0x37
281 #define GIS 0x38
282 #define IVA 0x38
283 #define IPC 0x39
284 #define ISR 0x3a
285 #define IMR 0x3a
286 #define PVR 0x3c
287 #define PIS 0x3d
288 #define PIM 0x3d
289 #define PCR 0x3e
290 #define CCR4 0x3f
291
292 // IMR/ISR
293
294 #define IRQ_BREAK_ON BIT15 // rx break detected
295 #define IRQ_DATAOVERRUN BIT14 // receive data overflow
296 #define IRQ_ALLSENT BIT13 // all sent
297 #define IRQ_UNDERRUN BIT12 // transmit data underrun
298 #define IRQ_TIMER BIT11 // timer interrupt
299 #define IRQ_CTS BIT10 // CTS status change
300 #define IRQ_TXREPEAT BIT9 // tx message repeat
301 #define IRQ_TXFIFO BIT8 // transmit pool ready
302 #define IRQ_RXEOM BIT7 // receive message end
303 #define IRQ_EXITHUNT BIT6 // receive frame start
304 #define IRQ_RXTIME BIT6 // rx char timeout
305 #define IRQ_DCD BIT2 // carrier detect status change
306 #define IRQ_OVERRUN BIT1 // receive frame overflow
307 #define IRQ_RXFIFO BIT0 // receive pool full
308
309 // STAR
310
311 #define XFW BIT6 // transmit FIFO write enable
312 #define CEC BIT2 // command executing
313 #define CTS BIT1 // CTS state
314
315 #define PVR_DTR BIT0
316 #define PVR_DSR BIT1
317 #define PVR_RI BIT2
318 #define PVR_AUTOCTS BIT3
319 #define PVR_RS232 0x20 /* 0010b */
320 #define PVR_V35 0xe0 /* 1110b */
321 #define PVR_RS422 0x40 /* 0100b */
322
323 /* Register access functions */
324
325 #define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
326 #define read_reg(info, reg) inb((info)->io_base + (reg))
327
328 #define read_reg16(info, reg) inw((info)->io_base + (reg))
329 #define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
330
331 #define set_reg_bits(info, reg, mask) \
332 write_reg(info, (reg), \
333 (unsigned char) (read_reg(info, (reg)) | (mask)))
334 #define clear_reg_bits(info, reg, mask) \
335 write_reg(info, (reg), \
336 (unsigned char) (read_reg(info, (reg)) & ~(mask)))
337 /*
338 * interrupt enable/disable routines
339 */
irq_disable(MGSLPC_INFO * info,unsigned char channel,unsigned short mask)340 static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
341 {
342 if (channel == CHA) {
343 info->imra_value |= mask;
344 write_reg16(info, CHA + IMR, info->imra_value);
345 } else {
346 info->imrb_value |= mask;
347 write_reg16(info, CHB + IMR, info->imrb_value);
348 }
349 }
irq_enable(MGSLPC_INFO * info,unsigned char channel,unsigned short mask)350 static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
351 {
352 if (channel == CHA) {
353 info->imra_value &= ~mask;
354 write_reg16(info, CHA + IMR, info->imra_value);
355 } else {
356 info->imrb_value &= ~mask;
357 write_reg16(info, CHB + IMR, info->imrb_value);
358 }
359 }
360
361 #define port_irq_disable(info, mask) \
362 { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
363
364 #define port_irq_enable(info, mask) \
365 { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
366
367 static void rx_start(MGSLPC_INFO *info);
368 static void rx_stop(MGSLPC_INFO *info);
369
370 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty);
371 static void tx_stop(MGSLPC_INFO *info);
372 static void tx_set_idle(MGSLPC_INFO *info);
373
374 static void get_signals(MGSLPC_INFO *info);
375 static void set_signals(MGSLPC_INFO *info);
376
377 static void reset_device(MGSLPC_INFO *info);
378
379 static void hdlc_mode(MGSLPC_INFO *info);
380 static void async_mode(MGSLPC_INFO *info);
381
382 static void tx_timeout(unsigned long context);
383
384 static int carrier_raised(struct tty_port *port);
385 static void raise_dtr_rts(struct tty_port *port);
386
387 #if SYNCLINK_GENERIC_HDLC
388 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
389 static void hdlcdev_tx_done(MGSLPC_INFO *info);
390 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size);
391 static int hdlcdev_init(MGSLPC_INFO *info);
392 static void hdlcdev_exit(MGSLPC_INFO *info);
393 #endif
394
395 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
396
397 static bool register_test(MGSLPC_INFO *info);
398 static bool irq_test(MGSLPC_INFO *info);
399 static int adapter_test(MGSLPC_INFO *info);
400
401 static int claim_resources(MGSLPC_INFO *info);
402 static void release_resources(MGSLPC_INFO *info);
403 static void mgslpc_add_device(MGSLPC_INFO *info);
404 static void mgslpc_remove_device(MGSLPC_INFO *info);
405
406 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty);
407 static void rx_reset_buffers(MGSLPC_INFO *info);
408 static int rx_alloc_buffers(MGSLPC_INFO *info);
409 static void rx_free_buffers(MGSLPC_INFO *info);
410
411 static irqreturn_t mgslpc_isr(int irq, void *dev_id);
412
413 /*
414 * Bottom half interrupt handlers
415 */
416 static void bh_handler(struct work_struct *work);
417 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty);
418 static void bh_status(MGSLPC_INFO *info);
419
420 /*
421 * ioctl handlers
422 */
423 static int tiocmget(struct tty_struct *tty, struct file *file);
424 static int tiocmset(struct tty_struct *tty, struct file *file,
425 unsigned int set, unsigned int clear);
426 static int get_stats(MGSLPC_INFO *info, struct mgsl_icount __user *user_icount);
427 static int get_params(MGSLPC_INFO *info, MGSL_PARAMS __user *user_params);
428 static int set_params(MGSLPC_INFO *info, MGSL_PARAMS __user *new_params, struct tty_struct *tty);
429 static int get_txidle(MGSLPC_INFO *info, int __user *idle_mode);
430 static int set_txidle(MGSLPC_INFO *info, int idle_mode);
431 static int set_txenable(MGSLPC_INFO *info, int enable, struct tty_struct *tty);
432 static int tx_abort(MGSLPC_INFO *info);
433 static int set_rxenable(MGSLPC_INFO *info, int enable);
434 static int wait_events(MGSLPC_INFO *info, int __user *mask);
435
436 static MGSLPC_INFO *mgslpc_device_list = NULL;
437 static int mgslpc_device_count = 0;
438
439 /*
440 * Set this param to non-zero to load eax with the
441 * .text section address and breakpoint on module load.
442 * This is useful for use with gdb and add-symbol-file command.
443 */
444 static int break_on_load=0;
445
446 /*
447 * Driver major number, defaults to zero to get auto
448 * assigned major number. May be forced as module parameter.
449 */
450 static int ttymajor=0;
451
452 static int debug_level = 0;
453 static int maxframe[MAX_DEVICE_COUNT] = {0,};
454
455 module_param(break_on_load, bool, 0);
456 module_param(ttymajor, int, 0);
457 module_param(debug_level, int, 0);
458 module_param_array(maxframe, int, NULL, 0);
459
460 MODULE_LICENSE("GPL");
461
462 static char *driver_name = "SyncLink PC Card driver";
463 static char *driver_version = "$Revision: 4.34 $";
464
465 static struct tty_driver *serial_driver;
466
467 /* number of characters left in xmit buffer before we ask for more */
468 #define WAKEUP_CHARS 256
469
470 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty);
471 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
472
473 /* PCMCIA prototypes */
474
475 static int mgslpc_config(struct pcmcia_device *link);
476 static void mgslpc_release(u_long arg);
477 static void mgslpc_detach(struct pcmcia_device *p_dev);
478
479 /*
480 * 1st function defined in .text section. Calling this function in
481 * init_module() followed by a breakpoint allows a remote debugger
482 * (gdb) to get the .text address for the add-symbol-file command.
483 * This allows remote debugging of dynamically loadable modules.
484 */
mgslpc_get_text_ptr(void)485 static void* mgslpc_get_text_ptr(void)
486 {
487 return mgslpc_get_text_ptr;
488 }
489
490 /**
491 * line discipline callback wrappers
492 *
493 * The wrappers maintain line discipline references
494 * while calling into the line discipline.
495 *
496 * ldisc_receive_buf - pass receive data to line discipline
497 */
498
ldisc_receive_buf(struct tty_struct * tty,const __u8 * data,char * flags,int count)499 static void ldisc_receive_buf(struct tty_struct *tty,
500 const __u8 *data, char *flags, int count)
501 {
502 struct tty_ldisc *ld;
503 if (!tty)
504 return;
505 ld = tty_ldisc_ref(tty);
506 if (ld) {
507 if (ld->ops->receive_buf)
508 ld->ops->receive_buf(tty, data, flags, count);
509 tty_ldisc_deref(ld);
510 }
511 }
512
513 static const struct tty_port_operations mgslpc_port_ops = {
514 .carrier_raised = carrier_raised,
515 .raise_dtr_rts = raise_dtr_rts
516 };
517
mgslpc_probe(struct pcmcia_device * link)518 static int mgslpc_probe(struct pcmcia_device *link)
519 {
520 MGSLPC_INFO *info;
521 int ret;
522
523 if (debug_level >= DEBUG_LEVEL_INFO)
524 printk("mgslpc_attach\n");
525
526 info = kzalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
527 if (!info) {
528 printk("Error can't allocate device instance data\n");
529 return -ENOMEM;
530 }
531
532 info->magic = MGSLPC_MAGIC;
533 tty_port_init(&info->port);
534 info->port.ops = &mgslpc_port_ops;
535 INIT_WORK(&info->task, bh_handler);
536 info->max_frame_size = 4096;
537 info->port.close_delay = 5*HZ/10;
538 info->port.closing_wait = 30*HZ;
539 init_waitqueue_head(&info->status_event_wait_q);
540 init_waitqueue_head(&info->event_wait_q);
541 spin_lock_init(&info->lock);
542 spin_lock_init(&info->netlock);
543 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
544 info->idle_mode = HDLC_TXIDLE_FLAGS;
545 info->imra_value = 0xffff;
546 info->imrb_value = 0xffff;
547 info->pim_value = 0xff;
548
549 info->p_dev = link;
550 link->priv = info;
551
552 /* Initialize the struct pcmcia_device structure */
553
554 /* Interrupt setup */
555 link->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING;
556 link->irq.IRQInfo1 = IRQ_LEVEL_ID;
557 link->irq.Handler = NULL;
558
559 link->conf.Attributes = 0;
560 link->conf.IntType = INT_MEMORY_AND_IO;
561
562 ret = mgslpc_config(link);
563 if (ret)
564 return ret;
565
566 mgslpc_add_device(info);
567
568 return 0;
569 }
570
571 /* Card has been inserted.
572 */
573
574 #define CS_CHECK(fn, ret) \
575 do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
576
mgslpc_config(struct pcmcia_device * link)577 static int mgslpc_config(struct pcmcia_device *link)
578 {
579 MGSLPC_INFO *info = link->priv;
580 tuple_t tuple;
581 cisparse_t parse;
582 int last_fn, last_ret;
583 u_char buf[64];
584 cistpl_cftable_entry_t dflt = { 0 };
585 cistpl_cftable_entry_t *cfg;
586
587 if (debug_level >= DEBUG_LEVEL_INFO)
588 printk("mgslpc_config(0x%p)\n", link);
589
590 tuple.Attributes = 0;
591 tuple.TupleData = buf;
592 tuple.TupleDataMax = sizeof(buf);
593 tuple.TupleOffset = 0;
594
595 /* get CIS configuration entry */
596
597 tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
598 CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
599
600 cfg = &(parse.cftable_entry);
601 CS_CHECK(GetTupleData, pcmcia_get_tuple_data(link, &tuple));
602 CS_CHECK(ParseTuple, pcmcia_parse_tuple(&tuple, &parse));
603
604 if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
605 if (cfg->index == 0)
606 goto cs_failed;
607
608 link->conf.ConfigIndex = cfg->index;
609 link->conf.Attributes |= CONF_ENABLE_IRQ;
610
611 /* IO window settings */
612 link->io.NumPorts1 = 0;
613 if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
614 cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
615 link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
616 if (!(io->flags & CISTPL_IO_8BIT))
617 link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
618 if (!(io->flags & CISTPL_IO_16BIT))
619 link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
620 link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
621 link->io.BasePort1 = io->win[0].base;
622 link->io.NumPorts1 = io->win[0].len;
623 CS_CHECK(RequestIO, pcmcia_request_io(link, &link->io));
624 }
625
626 link->conf.Attributes = CONF_ENABLE_IRQ;
627 link->conf.IntType = INT_MEMORY_AND_IO;
628 link->conf.ConfigIndex = 8;
629 link->conf.Present = PRESENT_OPTION;
630
631 link->irq.Attributes |= IRQ_HANDLE_PRESENT;
632 link->irq.Handler = mgslpc_isr;
633 link->irq.Instance = info;
634 CS_CHECK(RequestIRQ, pcmcia_request_irq(link, &link->irq));
635
636 CS_CHECK(RequestConfiguration, pcmcia_request_configuration(link, &link->conf));
637
638 info->io_base = link->io.BasePort1;
639 info->irq_level = link->irq.AssignedIRQ;
640
641 /* add to linked list of devices */
642 sprintf(info->node.dev_name, "mgslpc0");
643 info->node.major = info->node.minor = 0;
644 link->dev_node = &info->node;
645
646 printk(KERN_INFO "%s: index 0x%02x:",
647 info->node.dev_name, link->conf.ConfigIndex);
648 if (link->conf.Attributes & CONF_ENABLE_IRQ)
649 printk(", irq %d", link->irq.AssignedIRQ);
650 if (link->io.NumPorts1)
651 printk(", io 0x%04x-0x%04x", link->io.BasePort1,
652 link->io.BasePort1+link->io.NumPorts1-1);
653 printk("\n");
654 return 0;
655
656 cs_failed:
657 cs_error(link, last_fn, last_ret);
658 mgslpc_release((u_long)link);
659 return -ENODEV;
660 }
661
662 /* Card has been removed.
663 * Unregister device and release PCMCIA configuration.
664 * If device is open, postpone until it is closed.
665 */
mgslpc_release(u_long arg)666 static void mgslpc_release(u_long arg)
667 {
668 struct pcmcia_device *link = (struct pcmcia_device *)arg;
669
670 if (debug_level >= DEBUG_LEVEL_INFO)
671 printk("mgslpc_release(0x%p)\n", link);
672
673 pcmcia_disable_device(link);
674 }
675
mgslpc_detach(struct pcmcia_device * link)676 static void mgslpc_detach(struct pcmcia_device *link)
677 {
678 if (debug_level >= DEBUG_LEVEL_INFO)
679 printk("mgslpc_detach(0x%p)\n", link);
680
681 ((MGSLPC_INFO *)link->priv)->stop = 1;
682 mgslpc_release((u_long)link);
683
684 mgslpc_remove_device((MGSLPC_INFO *)link->priv);
685 }
686
mgslpc_suspend(struct pcmcia_device * link)687 static int mgslpc_suspend(struct pcmcia_device *link)
688 {
689 MGSLPC_INFO *info = link->priv;
690
691 info->stop = 1;
692
693 return 0;
694 }
695
mgslpc_resume(struct pcmcia_device * link)696 static int mgslpc_resume(struct pcmcia_device *link)
697 {
698 MGSLPC_INFO *info = link->priv;
699
700 info->stop = 0;
701
702 return 0;
703 }
704
705
mgslpc_paranoia_check(MGSLPC_INFO * info,char * name,const char * routine)706 static inline bool mgslpc_paranoia_check(MGSLPC_INFO *info,
707 char *name, const char *routine)
708 {
709 #ifdef MGSLPC_PARANOIA_CHECK
710 static const char *badmagic =
711 "Warning: bad magic number for mgsl struct (%s) in %s\n";
712 static const char *badinfo =
713 "Warning: null mgslpc_info for (%s) in %s\n";
714
715 if (!info) {
716 printk(badinfo, name, routine);
717 return true;
718 }
719 if (info->magic != MGSLPC_MAGIC) {
720 printk(badmagic, name, routine);
721 return true;
722 }
723 #else
724 if (!info)
725 return true;
726 #endif
727 return false;
728 }
729
730
731 #define CMD_RXFIFO BIT7 // release current rx FIFO
732 #define CMD_RXRESET BIT6 // receiver reset
733 #define CMD_RXFIFO_READ BIT5
734 #define CMD_START_TIMER BIT4
735 #define CMD_TXFIFO BIT3 // release current tx FIFO
736 #define CMD_TXEOM BIT1 // transmit end message
737 #define CMD_TXRESET BIT0 // transmit reset
738
wait_command_complete(MGSLPC_INFO * info,unsigned char channel)739 static bool wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
740 {
741 int i = 0;
742 /* wait for command completion */
743 while (read_reg(info, (unsigned char)(channel+STAR)) & BIT2) {
744 udelay(1);
745 if (i++ == 1000)
746 return false;
747 }
748 return true;
749 }
750
issue_command(MGSLPC_INFO * info,unsigned char channel,unsigned char cmd)751 static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
752 {
753 wait_command_complete(info, channel);
754 write_reg(info, (unsigned char) (channel + CMDR), cmd);
755 }
756
tx_pause(struct tty_struct * tty)757 static void tx_pause(struct tty_struct *tty)
758 {
759 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
760 unsigned long flags;
761
762 if (mgslpc_paranoia_check(info, tty->name, "tx_pause"))
763 return;
764 if (debug_level >= DEBUG_LEVEL_INFO)
765 printk("tx_pause(%s)\n",info->device_name);
766
767 spin_lock_irqsave(&info->lock,flags);
768 if (info->tx_enabled)
769 tx_stop(info);
770 spin_unlock_irqrestore(&info->lock,flags);
771 }
772
tx_release(struct tty_struct * tty)773 static void tx_release(struct tty_struct *tty)
774 {
775 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
776 unsigned long flags;
777
778 if (mgslpc_paranoia_check(info, tty->name, "tx_release"))
779 return;
780 if (debug_level >= DEBUG_LEVEL_INFO)
781 printk("tx_release(%s)\n",info->device_name);
782
783 spin_lock_irqsave(&info->lock,flags);
784 if (!info->tx_enabled)
785 tx_start(info, tty);
786 spin_unlock_irqrestore(&info->lock,flags);
787 }
788
789 /* Return next bottom half action to perform.
790 * or 0 if nothing to do.
791 */
bh_action(MGSLPC_INFO * info)792 static int bh_action(MGSLPC_INFO *info)
793 {
794 unsigned long flags;
795 int rc = 0;
796
797 spin_lock_irqsave(&info->lock,flags);
798
799 if (info->pending_bh & BH_RECEIVE) {
800 info->pending_bh &= ~BH_RECEIVE;
801 rc = BH_RECEIVE;
802 } else if (info->pending_bh & BH_TRANSMIT) {
803 info->pending_bh &= ~BH_TRANSMIT;
804 rc = BH_TRANSMIT;
805 } else if (info->pending_bh & BH_STATUS) {
806 info->pending_bh &= ~BH_STATUS;
807 rc = BH_STATUS;
808 }
809
810 if (!rc) {
811 /* Mark BH routine as complete */
812 info->bh_running = false;
813 info->bh_requested = false;
814 }
815
816 spin_unlock_irqrestore(&info->lock,flags);
817
818 return rc;
819 }
820
bh_handler(struct work_struct * work)821 static void bh_handler(struct work_struct *work)
822 {
823 MGSLPC_INFO *info = container_of(work, MGSLPC_INFO, task);
824 struct tty_struct *tty;
825 int action;
826
827 if (!info)
828 return;
829
830 if (debug_level >= DEBUG_LEVEL_BH)
831 printk( "%s(%d):bh_handler(%s) entry\n",
832 __FILE__,__LINE__,info->device_name);
833
834 info->bh_running = true;
835 tty = tty_port_tty_get(&info->port);
836
837 while((action = bh_action(info)) != 0) {
838
839 /* Process work item */
840 if ( debug_level >= DEBUG_LEVEL_BH )
841 printk( "%s(%d):bh_handler() work item action=%d\n",
842 __FILE__,__LINE__,action);
843
844 switch (action) {
845
846 case BH_RECEIVE:
847 while(rx_get_frame(info, tty));
848 break;
849 case BH_TRANSMIT:
850 bh_transmit(info, tty);
851 break;
852 case BH_STATUS:
853 bh_status(info);
854 break;
855 default:
856 /* unknown work item ID */
857 printk("Unknown work item ID=%08X!\n", action);
858 break;
859 }
860 }
861
862 tty_kref_put(tty);
863 if (debug_level >= DEBUG_LEVEL_BH)
864 printk( "%s(%d):bh_handler(%s) exit\n",
865 __FILE__,__LINE__,info->device_name);
866 }
867
bh_transmit(MGSLPC_INFO * info,struct tty_struct * tty)868 static void bh_transmit(MGSLPC_INFO *info, struct tty_struct *tty)
869 {
870 if (debug_level >= DEBUG_LEVEL_BH)
871 printk("bh_transmit() entry on %s\n", info->device_name);
872
873 if (tty)
874 tty_wakeup(tty);
875 }
876
bh_status(MGSLPC_INFO * info)877 static void bh_status(MGSLPC_INFO *info)
878 {
879 info->ri_chkcount = 0;
880 info->dsr_chkcount = 0;
881 info->dcd_chkcount = 0;
882 info->cts_chkcount = 0;
883 }
884
885 /* eom: non-zero = end of frame */
rx_ready_hdlc(MGSLPC_INFO * info,int eom)886 static void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
887 {
888 unsigned char data[2];
889 unsigned char fifo_count, read_count, i;
890 RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
891
892 if (debug_level >= DEBUG_LEVEL_ISR)
893 printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
894
895 if (!info->rx_enabled)
896 return;
897
898 if (info->rx_frame_count >= info->rx_buf_count) {
899 /* no more free buffers */
900 issue_command(info, CHA, CMD_RXRESET);
901 info->pending_bh |= BH_RECEIVE;
902 info->rx_overflow = true;
903 info->icount.buf_overrun++;
904 return;
905 }
906
907 if (eom) {
908 /* end of frame, get FIFO count from RBCL register */
909 if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
910 fifo_count = 32;
911 } else
912 fifo_count = 32;
913
914 do {
915 if (fifo_count == 1) {
916 read_count = 1;
917 data[0] = read_reg(info, CHA + RXFIFO);
918 } else {
919 read_count = 2;
920 *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
921 }
922 fifo_count -= read_count;
923 if (!fifo_count && eom)
924 buf->status = data[--read_count];
925
926 for (i = 0; i < read_count; i++) {
927 if (buf->count >= info->max_frame_size) {
928 /* frame too large, reset receiver and reset current buffer */
929 issue_command(info, CHA, CMD_RXRESET);
930 buf->count = 0;
931 return;
932 }
933 *(buf->data + buf->count) = data[i];
934 buf->count++;
935 }
936 } while (fifo_count);
937
938 if (eom) {
939 info->pending_bh |= BH_RECEIVE;
940 info->rx_frame_count++;
941 info->rx_put++;
942 if (info->rx_put >= info->rx_buf_count)
943 info->rx_put = 0;
944 }
945 issue_command(info, CHA, CMD_RXFIFO);
946 }
947
rx_ready_async(MGSLPC_INFO * info,int tcd,struct tty_struct * tty)948 static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
949 {
950 unsigned char data, status, flag;
951 int fifo_count;
952 int work = 0;
953 struct mgsl_icount *icount = &info->icount;
954
955 if (tcd) {
956 /* early termination, get FIFO count from RBCL register */
957 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
958
959 /* Zero fifo count could mean 0 or 32 bytes available.
960 * If BIT5 of STAR is set then at least 1 byte is available.
961 */
962 if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
963 fifo_count = 32;
964 } else
965 fifo_count = 32;
966
967 tty_buffer_request_room(tty, fifo_count);
968 /* Flush received async data to receive data buffer. */
969 while (fifo_count) {
970 data = read_reg(info, CHA + RXFIFO);
971 status = read_reg(info, CHA + RXFIFO);
972 fifo_count -= 2;
973
974 icount->rx++;
975 flag = TTY_NORMAL;
976
977 // if no frameing/crc error then save data
978 // BIT7:parity error
979 // BIT6:framing error
980
981 if (status & (BIT7 + BIT6)) {
982 if (status & BIT7)
983 icount->parity++;
984 else
985 icount->frame++;
986
987 /* discard char if tty control flags say so */
988 if (status & info->ignore_status_mask)
989 continue;
990
991 status &= info->read_status_mask;
992
993 if (status & BIT7)
994 flag = TTY_PARITY;
995 else if (status & BIT6)
996 flag = TTY_FRAME;
997 }
998 work += tty_insert_flip_char(tty, data, flag);
999 }
1000 issue_command(info, CHA, CMD_RXFIFO);
1001
1002 if (debug_level >= DEBUG_LEVEL_ISR) {
1003 printk("%s(%d):rx_ready_async",
1004 __FILE__,__LINE__);
1005 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1006 __FILE__,__LINE__,icount->rx,icount->brk,
1007 icount->parity,icount->frame,icount->overrun);
1008 }
1009
1010 if (work)
1011 tty_flip_buffer_push(tty);
1012 }
1013
1014
tx_done(MGSLPC_INFO * info,struct tty_struct * tty)1015 static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
1016 {
1017 if (!info->tx_active)
1018 return;
1019
1020 info->tx_active = false;
1021 info->tx_aborting = false;
1022
1023 if (info->params.mode == MGSL_MODE_ASYNC)
1024 return;
1025
1026 info->tx_count = info->tx_put = info->tx_get = 0;
1027 del_timer(&info->tx_timer);
1028
1029 if (info->drop_rts_on_tx_done) {
1030 get_signals(info);
1031 if (info->serial_signals & SerialSignal_RTS) {
1032 info->serial_signals &= ~SerialSignal_RTS;
1033 set_signals(info);
1034 }
1035 info->drop_rts_on_tx_done = false;
1036 }
1037
1038 #if SYNCLINK_GENERIC_HDLC
1039 if (info->netcount)
1040 hdlcdev_tx_done(info);
1041 else
1042 #endif
1043 {
1044 if (tty->stopped || tty->hw_stopped) {
1045 tx_stop(info);
1046 return;
1047 }
1048 info->pending_bh |= BH_TRANSMIT;
1049 }
1050 }
1051
tx_ready(MGSLPC_INFO * info,struct tty_struct * tty)1052 static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
1053 {
1054 unsigned char fifo_count = 32;
1055 int c;
1056
1057 if (debug_level >= DEBUG_LEVEL_ISR)
1058 printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
1059
1060 if (info->params.mode == MGSL_MODE_HDLC) {
1061 if (!info->tx_active)
1062 return;
1063 } else {
1064 if (tty->stopped || tty->hw_stopped) {
1065 tx_stop(info);
1066 return;
1067 }
1068 if (!info->tx_count)
1069 info->tx_active = false;
1070 }
1071
1072 if (!info->tx_count)
1073 return;
1074
1075 while (info->tx_count && fifo_count) {
1076 c = min(2, min_t(int, fifo_count, min(info->tx_count, TXBUFSIZE - info->tx_get)));
1077
1078 if (c == 1) {
1079 write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
1080 } else {
1081 write_reg16(info, CHA + TXFIFO,
1082 *((unsigned short*)(info->tx_buf + info->tx_get)));
1083 }
1084 info->tx_count -= c;
1085 info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
1086 fifo_count -= c;
1087 }
1088
1089 if (info->params.mode == MGSL_MODE_ASYNC) {
1090 if (info->tx_count < WAKEUP_CHARS)
1091 info->pending_bh |= BH_TRANSMIT;
1092 issue_command(info, CHA, CMD_TXFIFO);
1093 } else {
1094 if (info->tx_count)
1095 issue_command(info, CHA, CMD_TXFIFO);
1096 else
1097 issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
1098 }
1099 }
1100
cts_change(MGSLPC_INFO * info,struct tty_struct * tty)1101 static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
1102 {
1103 get_signals(info);
1104 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1105 irq_disable(info, CHB, IRQ_CTS);
1106 info->icount.cts++;
1107 if (info->serial_signals & SerialSignal_CTS)
1108 info->input_signal_events.cts_up++;
1109 else
1110 info->input_signal_events.cts_down++;
1111 wake_up_interruptible(&info->status_event_wait_q);
1112 wake_up_interruptible(&info->event_wait_q);
1113
1114 if (info->port.flags & ASYNC_CTS_FLOW) {
1115 if (tty->hw_stopped) {
1116 if (info->serial_signals & SerialSignal_CTS) {
1117 if (debug_level >= DEBUG_LEVEL_ISR)
1118 printk("CTS tx start...");
1119 if (tty)
1120 tty->hw_stopped = 0;
1121 tx_start(info, tty);
1122 info->pending_bh |= BH_TRANSMIT;
1123 return;
1124 }
1125 } else {
1126 if (!(info->serial_signals & SerialSignal_CTS)) {
1127 if (debug_level >= DEBUG_LEVEL_ISR)
1128 printk("CTS tx stop...");
1129 if (tty)
1130 tty->hw_stopped = 1;
1131 tx_stop(info);
1132 }
1133 }
1134 }
1135 info->pending_bh |= BH_STATUS;
1136 }
1137
dcd_change(MGSLPC_INFO * info,struct tty_struct * tty)1138 static void dcd_change(MGSLPC_INFO *info, struct tty_struct *tty)
1139 {
1140 get_signals(info);
1141 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1142 irq_disable(info, CHB, IRQ_DCD);
1143 info->icount.dcd++;
1144 if (info->serial_signals & SerialSignal_DCD) {
1145 info->input_signal_events.dcd_up++;
1146 }
1147 else
1148 info->input_signal_events.dcd_down++;
1149 #if SYNCLINK_GENERIC_HDLC
1150 if (info->netcount) {
1151 if (info->serial_signals & SerialSignal_DCD)
1152 netif_carrier_on(info->netdev);
1153 else
1154 netif_carrier_off(info->netdev);
1155 }
1156 #endif
1157 wake_up_interruptible(&info->status_event_wait_q);
1158 wake_up_interruptible(&info->event_wait_q);
1159
1160 if (info->port.flags & ASYNC_CHECK_CD) {
1161 if (debug_level >= DEBUG_LEVEL_ISR)
1162 printk("%s CD now %s...", info->device_name,
1163 (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
1164 if (info->serial_signals & SerialSignal_DCD)
1165 wake_up_interruptible(&info->port.open_wait);
1166 else {
1167 if (debug_level >= DEBUG_LEVEL_ISR)
1168 printk("doing serial hangup...");
1169 if (tty)
1170 tty_hangup(tty);
1171 }
1172 }
1173 info->pending_bh |= BH_STATUS;
1174 }
1175
dsr_change(MGSLPC_INFO * info)1176 static void dsr_change(MGSLPC_INFO *info)
1177 {
1178 get_signals(info);
1179 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1180 port_irq_disable(info, PVR_DSR);
1181 info->icount.dsr++;
1182 if (info->serial_signals & SerialSignal_DSR)
1183 info->input_signal_events.dsr_up++;
1184 else
1185 info->input_signal_events.dsr_down++;
1186 wake_up_interruptible(&info->status_event_wait_q);
1187 wake_up_interruptible(&info->event_wait_q);
1188 info->pending_bh |= BH_STATUS;
1189 }
1190
ri_change(MGSLPC_INFO * info)1191 static void ri_change(MGSLPC_INFO *info)
1192 {
1193 get_signals(info);
1194 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1195 port_irq_disable(info, PVR_RI);
1196 info->icount.rng++;
1197 if (info->serial_signals & SerialSignal_RI)
1198 info->input_signal_events.ri_up++;
1199 else
1200 info->input_signal_events.ri_down++;
1201 wake_up_interruptible(&info->status_event_wait_q);
1202 wake_up_interruptible(&info->event_wait_q);
1203 info->pending_bh |= BH_STATUS;
1204 }
1205
1206 /* Interrupt service routine entry point.
1207 *
1208 * Arguments:
1209 *
1210 * irq interrupt number that caused interrupt
1211 * dev_id device ID supplied during interrupt registration
1212 */
mgslpc_isr(int dummy,void * dev_id)1213 static irqreturn_t mgslpc_isr(int dummy, void *dev_id)
1214 {
1215 MGSLPC_INFO *info = dev_id;
1216 struct tty_struct *tty;
1217 unsigned short isr;
1218 unsigned char gis, pis;
1219 int count=0;
1220
1221 if (debug_level >= DEBUG_LEVEL_ISR)
1222 printk("mgslpc_isr(%d) entry.\n", info->irq_level);
1223
1224 if (!(info->p_dev->_locked))
1225 return IRQ_HANDLED;
1226
1227 tty = tty_port_tty_get(&info->port);
1228
1229 spin_lock(&info->lock);
1230
1231 while ((gis = read_reg(info, CHA + GIS))) {
1232 if (debug_level >= DEBUG_LEVEL_ISR)
1233 printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
1234
1235 if ((gis & 0x70) || count > 1000) {
1236 printk("synclink_cs:hardware failed or ejected\n");
1237 break;
1238 }
1239 count++;
1240
1241 if (gis & (BIT1 + BIT0)) {
1242 isr = read_reg16(info, CHB + ISR);
1243 if (isr & IRQ_DCD)
1244 dcd_change(info, tty);
1245 if (isr & IRQ_CTS)
1246 cts_change(info, tty);
1247 }
1248 if (gis & (BIT3 + BIT2))
1249 {
1250 isr = read_reg16(info, CHA + ISR);
1251 if (isr & IRQ_TIMER) {
1252 info->irq_occurred = true;
1253 irq_disable(info, CHA, IRQ_TIMER);
1254 }
1255
1256 /* receive IRQs */
1257 if (isr & IRQ_EXITHUNT) {
1258 info->icount.exithunt++;
1259 wake_up_interruptible(&info->event_wait_q);
1260 }
1261 if (isr & IRQ_BREAK_ON) {
1262 info->icount.brk++;
1263 if (info->port.flags & ASYNC_SAK)
1264 do_SAK(tty);
1265 }
1266 if (isr & IRQ_RXTIME) {
1267 issue_command(info, CHA, CMD_RXFIFO_READ);
1268 }
1269 if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
1270 if (info->params.mode == MGSL_MODE_HDLC)
1271 rx_ready_hdlc(info, isr & IRQ_RXEOM);
1272 else
1273 rx_ready_async(info, isr & IRQ_RXEOM, tty);
1274 }
1275
1276 /* transmit IRQs */
1277 if (isr & IRQ_UNDERRUN) {
1278 if (info->tx_aborting)
1279 info->icount.txabort++;
1280 else
1281 info->icount.txunder++;
1282 tx_done(info, tty);
1283 }
1284 else if (isr & IRQ_ALLSENT) {
1285 info->icount.txok++;
1286 tx_done(info, tty);
1287 }
1288 else if (isr & IRQ_TXFIFO)
1289 tx_ready(info, tty);
1290 }
1291 if (gis & BIT7) {
1292 pis = read_reg(info, CHA + PIS);
1293 if (pis & BIT1)
1294 dsr_change(info);
1295 if (pis & BIT2)
1296 ri_change(info);
1297 }
1298 }
1299
1300 /* Request bottom half processing if there's something
1301 * for it to do and the bh is not already running
1302 */
1303
1304 if (info->pending_bh && !info->bh_running && !info->bh_requested) {
1305 if ( debug_level >= DEBUG_LEVEL_ISR )
1306 printk("%s(%d):%s queueing bh task.\n",
1307 __FILE__,__LINE__,info->device_name);
1308 schedule_work(&info->task);
1309 info->bh_requested = true;
1310 }
1311
1312 spin_unlock(&info->lock);
1313 tty_kref_put(tty);
1314
1315 if (debug_level >= DEBUG_LEVEL_ISR)
1316 printk("%s(%d):mgslpc_isr(%d)exit.\n",
1317 __FILE__, __LINE__, info->irq_level);
1318
1319 return IRQ_HANDLED;
1320 }
1321
1322 /* Initialize and start device.
1323 */
startup(MGSLPC_INFO * info,struct tty_struct * tty)1324 static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
1325 {
1326 int retval = 0;
1327
1328 if (debug_level >= DEBUG_LEVEL_INFO)
1329 printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
1330
1331 if (info->port.flags & ASYNC_INITIALIZED)
1332 return 0;
1333
1334 if (!info->tx_buf) {
1335 /* allocate a page of memory for a transmit buffer */
1336 info->tx_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1337 if (!info->tx_buf) {
1338 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1339 __FILE__,__LINE__,info->device_name);
1340 return -ENOMEM;
1341 }
1342 }
1343
1344 info->pending_bh = 0;
1345
1346 memset(&info->icount, 0, sizeof(info->icount));
1347
1348 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
1349
1350 /* Allocate and claim adapter resources */
1351 retval = claim_resources(info);
1352
1353 /* perform existance check and diagnostics */
1354 if ( !retval )
1355 retval = adapter_test(info);
1356
1357 if ( retval ) {
1358 if (capable(CAP_SYS_ADMIN) && tty)
1359 set_bit(TTY_IO_ERROR, &tty->flags);
1360 release_resources(info);
1361 return retval;
1362 }
1363
1364 /* program hardware for current parameters */
1365 mgslpc_change_params(info, tty);
1366
1367 if (tty)
1368 clear_bit(TTY_IO_ERROR, &tty->flags);
1369
1370 info->port.flags |= ASYNC_INITIALIZED;
1371
1372 return 0;
1373 }
1374
1375 /* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
1376 */
shutdown(MGSLPC_INFO * info,struct tty_struct * tty)1377 static void shutdown(MGSLPC_INFO * info, struct tty_struct *tty)
1378 {
1379 unsigned long flags;
1380
1381 if (!(info->port.flags & ASYNC_INITIALIZED))
1382 return;
1383
1384 if (debug_level >= DEBUG_LEVEL_INFO)
1385 printk("%s(%d):mgslpc_shutdown(%s)\n",
1386 __FILE__,__LINE__, info->device_name );
1387
1388 /* clear status wait queue because status changes */
1389 /* can't happen after shutting down the hardware */
1390 wake_up_interruptible(&info->status_event_wait_q);
1391 wake_up_interruptible(&info->event_wait_q);
1392
1393 del_timer_sync(&info->tx_timer);
1394
1395 if (info->tx_buf) {
1396 free_page((unsigned long) info->tx_buf);
1397 info->tx_buf = NULL;
1398 }
1399
1400 spin_lock_irqsave(&info->lock,flags);
1401
1402 rx_stop(info);
1403 tx_stop(info);
1404
1405 /* TODO:disable interrupts instead of reset to preserve signal states */
1406 reset_device(info);
1407
1408 if (!tty || tty->termios->c_cflag & HUPCL) {
1409 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1410 set_signals(info);
1411 }
1412
1413 spin_unlock_irqrestore(&info->lock,flags);
1414
1415 release_resources(info);
1416
1417 if (tty)
1418 set_bit(TTY_IO_ERROR, &tty->flags);
1419
1420 info->port.flags &= ~ASYNC_INITIALIZED;
1421 }
1422
mgslpc_program_hw(MGSLPC_INFO * info,struct tty_struct * tty)1423 static void mgslpc_program_hw(MGSLPC_INFO *info, struct tty_struct *tty)
1424 {
1425 unsigned long flags;
1426
1427 spin_lock_irqsave(&info->lock,flags);
1428
1429 rx_stop(info);
1430 tx_stop(info);
1431 info->tx_count = info->tx_put = info->tx_get = 0;
1432
1433 if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
1434 hdlc_mode(info);
1435 else
1436 async_mode(info);
1437
1438 set_signals(info);
1439
1440 info->dcd_chkcount = 0;
1441 info->cts_chkcount = 0;
1442 info->ri_chkcount = 0;
1443 info->dsr_chkcount = 0;
1444
1445 irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
1446 port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
1447 get_signals(info);
1448
1449 if (info->netcount || (tty && (tty->termios->c_cflag & CREAD)))
1450 rx_start(info);
1451
1452 spin_unlock_irqrestore(&info->lock,flags);
1453 }
1454
1455 /* Reconfigure adapter based on new parameters
1456 */
mgslpc_change_params(MGSLPC_INFO * info,struct tty_struct * tty)1457 static void mgslpc_change_params(MGSLPC_INFO *info, struct tty_struct *tty)
1458 {
1459 unsigned cflag;
1460 int bits_per_char;
1461
1462 if (!tty || !tty->termios)
1463 return;
1464
1465 if (debug_level >= DEBUG_LEVEL_INFO)
1466 printk("%s(%d):mgslpc_change_params(%s)\n",
1467 __FILE__,__LINE__, info->device_name );
1468
1469 cflag = tty->termios->c_cflag;
1470
1471 /* if B0 rate (hangup) specified then negate DTR and RTS */
1472 /* otherwise assert DTR and RTS */
1473 if (cflag & CBAUD)
1474 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1475 else
1476 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1477
1478 /* byte size and parity */
1479
1480 switch (cflag & CSIZE) {
1481 case CS5: info->params.data_bits = 5; break;
1482 case CS6: info->params.data_bits = 6; break;
1483 case CS7: info->params.data_bits = 7; break;
1484 case CS8: info->params.data_bits = 8; break;
1485 default: info->params.data_bits = 7; break;
1486 }
1487
1488 if (cflag & CSTOPB)
1489 info->params.stop_bits = 2;
1490 else
1491 info->params.stop_bits = 1;
1492
1493 info->params.parity = ASYNC_PARITY_NONE;
1494 if (cflag & PARENB) {
1495 if (cflag & PARODD)
1496 info->params.parity = ASYNC_PARITY_ODD;
1497 else
1498 info->params.parity = ASYNC_PARITY_EVEN;
1499 #ifdef CMSPAR
1500 if (cflag & CMSPAR)
1501 info->params.parity = ASYNC_PARITY_SPACE;
1502 #endif
1503 }
1504
1505 /* calculate number of jiffies to transmit a full
1506 * FIFO (32 bytes) at specified data rate
1507 */
1508 bits_per_char = info->params.data_bits +
1509 info->params.stop_bits + 1;
1510
1511 /* if port data rate is set to 460800 or less then
1512 * allow tty settings to override, otherwise keep the
1513 * current data rate.
1514 */
1515 if (info->params.data_rate <= 460800) {
1516 info->params.data_rate = tty_get_baud_rate(tty);
1517 }
1518
1519 if ( info->params.data_rate ) {
1520 info->timeout = (32*HZ*bits_per_char) /
1521 info->params.data_rate;
1522 }
1523 info->timeout += HZ/50; /* Add .02 seconds of slop */
1524
1525 if (cflag & CRTSCTS)
1526 info->port.flags |= ASYNC_CTS_FLOW;
1527 else
1528 info->port.flags &= ~ASYNC_CTS_FLOW;
1529
1530 if (cflag & CLOCAL)
1531 info->port.flags &= ~ASYNC_CHECK_CD;
1532 else
1533 info->port.flags |= ASYNC_CHECK_CD;
1534
1535 /* process tty input control flags */
1536
1537 info->read_status_mask = 0;
1538 if (I_INPCK(tty))
1539 info->read_status_mask |= BIT7 | BIT6;
1540 if (I_IGNPAR(tty))
1541 info->ignore_status_mask |= BIT7 | BIT6;
1542
1543 mgslpc_program_hw(info, tty);
1544 }
1545
1546 /* Add a character to the transmit buffer
1547 */
mgslpc_put_char(struct tty_struct * tty,unsigned char ch)1548 static int mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
1549 {
1550 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1551 unsigned long flags;
1552
1553 if (debug_level >= DEBUG_LEVEL_INFO) {
1554 printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
1555 __FILE__,__LINE__,ch,info->device_name);
1556 }
1557
1558 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_put_char"))
1559 return 0;
1560
1561 if (!info->tx_buf)
1562 return 0;
1563
1564 spin_lock_irqsave(&info->lock,flags);
1565
1566 if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
1567 if (info->tx_count < TXBUFSIZE - 1) {
1568 info->tx_buf[info->tx_put++] = ch;
1569 info->tx_put &= TXBUFSIZE-1;
1570 info->tx_count++;
1571 }
1572 }
1573
1574 spin_unlock_irqrestore(&info->lock,flags);
1575 return 1;
1576 }
1577
1578 /* Enable transmitter so remaining characters in the
1579 * transmit buffer are sent.
1580 */
mgslpc_flush_chars(struct tty_struct * tty)1581 static void mgslpc_flush_chars(struct tty_struct *tty)
1582 {
1583 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1584 unsigned long flags;
1585
1586 if (debug_level >= DEBUG_LEVEL_INFO)
1587 printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
1588 __FILE__,__LINE__,info->device_name,info->tx_count);
1589
1590 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_chars"))
1591 return;
1592
1593 if (info->tx_count <= 0 || tty->stopped ||
1594 tty->hw_stopped || !info->tx_buf)
1595 return;
1596
1597 if (debug_level >= DEBUG_LEVEL_INFO)
1598 printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
1599 __FILE__,__LINE__,info->device_name);
1600
1601 spin_lock_irqsave(&info->lock,flags);
1602 if (!info->tx_active)
1603 tx_start(info, tty);
1604 spin_unlock_irqrestore(&info->lock,flags);
1605 }
1606
1607 /* Send a block of data
1608 *
1609 * Arguments:
1610 *
1611 * tty pointer to tty information structure
1612 * buf pointer to buffer containing send data
1613 * count size of send data in bytes
1614 *
1615 * Returns: number of characters written
1616 */
mgslpc_write(struct tty_struct * tty,const unsigned char * buf,int count)1617 static int mgslpc_write(struct tty_struct * tty,
1618 const unsigned char *buf, int count)
1619 {
1620 int c, ret = 0;
1621 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1622 unsigned long flags;
1623
1624 if (debug_level >= DEBUG_LEVEL_INFO)
1625 printk( "%s(%d):mgslpc_write(%s) count=%d\n",
1626 __FILE__,__LINE__,info->device_name,count);
1627
1628 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write") ||
1629 !info->tx_buf)
1630 goto cleanup;
1631
1632 if (info->params.mode == MGSL_MODE_HDLC) {
1633 if (count > TXBUFSIZE) {
1634 ret = -EIO;
1635 goto cleanup;
1636 }
1637 if (info->tx_active)
1638 goto cleanup;
1639 else if (info->tx_count)
1640 goto start;
1641 }
1642
1643 for (;;) {
1644 c = min(count,
1645 min(TXBUFSIZE - info->tx_count - 1,
1646 TXBUFSIZE - info->tx_put));
1647 if (c <= 0)
1648 break;
1649
1650 memcpy(info->tx_buf + info->tx_put, buf, c);
1651
1652 spin_lock_irqsave(&info->lock,flags);
1653 info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
1654 info->tx_count += c;
1655 spin_unlock_irqrestore(&info->lock,flags);
1656
1657 buf += c;
1658 count -= c;
1659 ret += c;
1660 }
1661 start:
1662 if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1663 spin_lock_irqsave(&info->lock,flags);
1664 if (!info->tx_active)
1665 tx_start(info, tty);
1666 spin_unlock_irqrestore(&info->lock,flags);
1667 }
1668 cleanup:
1669 if (debug_level >= DEBUG_LEVEL_INFO)
1670 printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
1671 __FILE__,__LINE__,info->device_name,ret);
1672 return ret;
1673 }
1674
1675 /* Return the count of free bytes in transmit buffer
1676 */
mgslpc_write_room(struct tty_struct * tty)1677 static int mgslpc_write_room(struct tty_struct *tty)
1678 {
1679 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1680 int ret;
1681
1682 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_write_room"))
1683 return 0;
1684
1685 if (info->params.mode == MGSL_MODE_HDLC) {
1686 /* HDLC (frame oriented) mode */
1687 if (info->tx_active)
1688 return 0;
1689 else
1690 return HDLC_MAX_FRAME_SIZE;
1691 } else {
1692 ret = TXBUFSIZE - info->tx_count - 1;
1693 if (ret < 0)
1694 ret = 0;
1695 }
1696
1697 if (debug_level >= DEBUG_LEVEL_INFO)
1698 printk("%s(%d):mgslpc_write_room(%s)=%d\n",
1699 __FILE__,__LINE__, info->device_name, ret);
1700 return ret;
1701 }
1702
1703 /* Return the count of bytes in transmit buffer
1704 */
mgslpc_chars_in_buffer(struct tty_struct * tty)1705 static int mgslpc_chars_in_buffer(struct tty_struct *tty)
1706 {
1707 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1708 int rc;
1709
1710 if (debug_level >= DEBUG_LEVEL_INFO)
1711 printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
1712 __FILE__,__LINE__, info->device_name );
1713
1714 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_chars_in_buffer"))
1715 return 0;
1716
1717 if (info->params.mode == MGSL_MODE_HDLC)
1718 rc = info->tx_active ? info->max_frame_size : 0;
1719 else
1720 rc = info->tx_count;
1721
1722 if (debug_level >= DEBUG_LEVEL_INFO)
1723 printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
1724 __FILE__,__LINE__, info->device_name, rc);
1725
1726 return rc;
1727 }
1728
1729 /* Discard all data in the send buffer
1730 */
mgslpc_flush_buffer(struct tty_struct * tty)1731 static void mgslpc_flush_buffer(struct tty_struct *tty)
1732 {
1733 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1734 unsigned long flags;
1735
1736 if (debug_level >= DEBUG_LEVEL_INFO)
1737 printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
1738 __FILE__,__LINE__, info->device_name );
1739
1740 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_flush_buffer"))
1741 return;
1742
1743 spin_lock_irqsave(&info->lock,flags);
1744 info->tx_count = info->tx_put = info->tx_get = 0;
1745 del_timer(&info->tx_timer);
1746 spin_unlock_irqrestore(&info->lock,flags);
1747
1748 wake_up_interruptible(&tty->write_wait);
1749 tty_wakeup(tty);
1750 }
1751
1752 /* Send a high-priority XON/XOFF character
1753 */
mgslpc_send_xchar(struct tty_struct * tty,char ch)1754 static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
1755 {
1756 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1757 unsigned long flags;
1758
1759 if (debug_level >= DEBUG_LEVEL_INFO)
1760 printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
1761 __FILE__,__LINE__, info->device_name, ch );
1762
1763 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_send_xchar"))
1764 return;
1765
1766 info->x_char = ch;
1767 if (ch) {
1768 spin_lock_irqsave(&info->lock,flags);
1769 if (!info->tx_enabled)
1770 tx_start(info, tty);
1771 spin_unlock_irqrestore(&info->lock,flags);
1772 }
1773 }
1774
1775 /* Signal remote device to throttle send data (our receive data)
1776 */
mgslpc_throttle(struct tty_struct * tty)1777 static void mgslpc_throttle(struct tty_struct * tty)
1778 {
1779 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1780 unsigned long flags;
1781
1782 if (debug_level >= DEBUG_LEVEL_INFO)
1783 printk("%s(%d):mgslpc_throttle(%s) entry\n",
1784 __FILE__,__LINE__, info->device_name );
1785
1786 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_throttle"))
1787 return;
1788
1789 if (I_IXOFF(tty))
1790 mgslpc_send_xchar(tty, STOP_CHAR(tty));
1791
1792 if (tty->termios->c_cflag & CRTSCTS) {
1793 spin_lock_irqsave(&info->lock,flags);
1794 info->serial_signals &= ~SerialSignal_RTS;
1795 set_signals(info);
1796 spin_unlock_irqrestore(&info->lock,flags);
1797 }
1798 }
1799
1800 /* Signal remote device to stop throttling send data (our receive data)
1801 */
mgslpc_unthrottle(struct tty_struct * tty)1802 static void mgslpc_unthrottle(struct tty_struct * tty)
1803 {
1804 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
1805 unsigned long flags;
1806
1807 if (debug_level >= DEBUG_LEVEL_INFO)
1808 printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
1809 __FILE__,__LINE__, info->device_name );
1810
1811 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_unthrottle"))
1812 return;
1813
1814 if (I_IXOFF(tty)) {
1815 if (info->x_char)
1816 info->x_char = 0;
1817 else
1818 mgslpc_send_xchar(tty, START_CHAR(tty));
1819 }
1820
1821 if (tty->termios->c_cflag & CRTSCTS) {
1822 spin_lock_irqsave(&info->lock,flags);
1823 info->serial_signals |= SerialSignal_RTS;
1824 set_signals(info);
1825 spin_unlock_irqrestore(&info->lock,flags);
1826 }
1827 }
1828
1829 /* get the current serial statistics
1830 */
get_stats(MGSLPC_INFO * info,struct mgsl_icount __user * user_icount)1831 static int get_stats(MGSLPC_INFO * info, struct mgsl_icount __user *user_icount)
1832 {
1833 int err;
1834 if (debug_level >= DEBUG_LEVEL_INFO)
1835 printk("get_params(%s)\n", info->device_name);
1836 if (!user_icount) {
1837 memset(&info->icount, 0, sizeof(info->icount));
1838 } else {
1839 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
1840 if (err)
1841 return -EFAULT;
1842 }
1843 return 0;
1844 }
1845
1846 /* get the current serial parameters
1847 */
get_params(MGSLPC_INFO * info,MGSL_PARAMS __user * user_params)1848 static int get_params(MGSLPC_INFO * info, MGSL_PARAMS __user *user_params)
1849 {
1850 int err;
1851 if (debug_level >= DEBUG_LEVEL_INFO)
1852 printk("get_params(%s)\n", info->device_name);
1853 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
1854 if (err)
1855 return -EFAULT;
1856 return 0;
1857 }
1858
1859 /* set the serial parameters
1860 *
1861 * Arguments:
1862 *
1863 * info pointer to device instance data
1864 * new_params user buffer containing new serial params
1865 *
1866 * Returns: 0 if success, otherwise error code
1867 */
set_params(MGSLPC_INFO * info,MGSL_PARAMS __user * new_params,struct tty_struct * tty)1868 static int set_params(MGSLPC_INFO * info, MGSL_PARAMS __user *new_params, struct tty_struct *tty)
1869 {
1870 unsigned long flags;
1871 MGSL_PARAMS tmp_params;
1872 int err;
1873
1874 if (debug_level >= DEBUG_LEVEL_INFO)
1875 printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
1876 info->device_name );
1877 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
1878 if (err) {
1879 if ( debug_level >= DEBUG_LEVEL_INFO )
1880 printk( "%s(%d):set_params(%s) user buffer copy failed\n",
1881 __FILE__,__LINE__,info->device_name);
1882 return -EFAULT;
1883 }
1884
1885 spin_lock_irqsave(&info->lock,flags);
1886 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
1887 spin_unlock_irqrestore(&info->lock,flags);
1888
1889 mgslpc_change_params(info, tty);
1890
1891 return 0;
1892 }
1893
get_txidle(MGSLPC_INFO * info,int __user * idle_mode)1894 static int get_txidle(MGSLPC_INFO * info, int __user *idle_mode)
1895 {
1896 int err;
1897 if (debug_level >= DEBUG_LEVEL_INFO)
1898 printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
1899 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
1900 if (err)
1901 return -EFAULT;
1902 return 0;
1903 }
1904
set_txidle(MGSLPC_INFO * info,int idle_mode)1905 static int set_txidle(MGSLPC_INFO * info, int idle_mode)
1906 {
1907 unsigned long flags;
1908 if (debug_level >= DEBUG_LEVEL_INFO)
1909 printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
1910 spin_lock_irqsave(&info->lock,flags);
1911 info->idle_mode = idle_mode;
1912 tx_set_idle(info);
1913 spin_unlock_irqrestore(&info->lock,flags);
1914 return 0;
1915 }
1916
get_interface(MGSLPC_INFO * info,int __user * if_mode)1917 static int get_interface(MGSLPC_INFO * info, int __user *if_mode)
1918 {
1919 int err;
1920 if (debug_level >= DEBUG_LEVEL_INFO)
1921 printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
1922 COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
1923 if (err)
1924 return -EFAULT;
1925 return 0;
1926 }
1927
set_interface(MGSLPC_INFO * info,int if_mode)1928 static int set_interface(MGSLPC_INFO * info, int if_mode)
1929 {
1930 unsigned long flags;
1931 unsigned char val;
1932 if (debug_level >= DEBUG_LEVEL_INFO)
1933 printk("set_interface(%s,%d)\n", info->device_name, if_mode);
1934 spin_lock_irqsave(&info->lock,flags);
1935 info->if_mode = if_mode;
1936
1937 val = read_reg(info, PVR) & 0x0f;
1938 switch (info->if_mode)
1939 {
1940 case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
1941 case MGSL_INTERFACE_V35: val |= PVR_V35; break;
1942 case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
1943 }
1944 write_reg(info, PVR, val);
1945
1946 spin_unlock_irqrestore(&info->lock,flags);
1947 return 0;
1948 }
1949
set_txenable(MGSLPC_INFO * info,int enable,struct tty_struct * tty)1950 static int set_txenable(MGSLPC_INFO * info, int enable, struct tty_struct *tty)
1951 {
1952 unsigned long flags;
1953
1954 if (debug_level >= DEBUG_LEVEL_INFO)
1955 printk("set_txenable(%s,%d)\n", info->device_name, enable);
1956
1957 spin_lock_irqsave(&info->lock,flags);
1958 if (enable) {
1959 if (!info->tx_enabled)
1960 tx_start(info, tty);
1961 } else {
1962 if (info->tx_enabled)
1963 tx_stop(info);
1964 }
1965 spin_unlock_irqrestore(&info->lock,flags);
1966 return 0;
1967 }
1968
tx_abort(MGSLPC_INFO * info)1969 static int tx_abort(MGSLPC_INFO * info)
1970 {
1971 unsigned long flags;
1972
1973 if (debug_level >= DEBUG_LEVEL_INFO)
1974 printk("tx_abort(%s)\n", info->device_name);
1975
1976 spin_lock_irqsave(&info->lock,flags);
1977 if (info->tx_active && info->tx_count &&
1978 info->params.mode == MGSL_MODE_HDLC) {
1979 /* clear data count so FIFO is not filled on next IRQ.
1980 * This results in underrun and abort transmission.
1981 */
1982 info->tx_count = info->tx_put = info->tx_get = 0;
1983 info->tx_aborting = true;
1984 }
1985 spin_unlock_irqrestore(&info->lock,flags);
1986 return 0;
1987 }
1988
set_rxenable(MGSLPC_INFO * info,int enable)1989 static int set_rxenable(MGSLPC_INFO * info, int enable)
1990 {
1991 unsigned long flags;
1992
1993 if (debug_level >= DEBUG_LEVEL_INFO)
1994 printk("set_rxenable(%s,%d)\n", info->device_name, enable);
1995
1996 spin_lock_irqsave(&info->lock,flags);
1997 if (enable) {
1998 if (!info->rx_enabled)
1999 rx_start(info);
2000 } else {
2001 if (info->rx_enabled)
2002 rx_stop(info);
2003 }
2004 spin_unlock_irqrestore(&info->lock,flags);
2005 return 0;
2006 }
2007
2008 /* wait for specified event to occur
2009 *
2010 * Arguments: info pointer to device instance data
2011 * mask pointer to bitmask of events to wait for
2012 * Return Value: 0 if successful and bit mask updated with
2013 * of events triggerred,
2014 * otherwise error code
2015 */
wait_events(MGSLPC_INFO * info,int __user * mask_ptr)2016 static int wait_events(MGSLPC_INFO * info, int __user *mask_ptr)
2017 {
2018 unsigned long flags;
2019 int s;
2020 int rc=0;
2021 struct mgsl_icount cprev, cnow;
2022 int events;
2023 int mask;
2024 struct _input_signal_events oldsigs, newsigs;
2025 DECLARE_WAITQUEUE(wait, current);
2026
2027 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2028 if (rc)
2029 return -EFAULT;
2030
2031 if (debug_level >= DEBUG_LEVEL_INFO)
2032 printk("wait_events(%s,%d)\n", info->device_name, mask);
2033
2034 spin_lock_irqsave(&info->lock,flags);
2035
2036 /* return immediately if state matches requested events */
2037 get_signals(info);
2038 s = info->serial_signals;
2039 events = mask &
2040 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2041 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2042 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2043 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2044 if (events) {
2045 spin_unlock_irqrestore(&info->lock,flags);
2046 goto exit;
2047 }
2048
2049 /* save current irq counts */
2050 cprev = info->icount;
2051 oldsigs = info->input_signal_events;
2052
2053 if ((info->params.mode == MGSL_MODE_HDLC) &&
2054 (mask & MgslEvent_ExitHuntMode))
2055 irq_enable(info, CHA, IRQ_EXITHUNT);
2056
2057 set_current_state(TASK_INTERRUPTIBLE);
2058 add_wait_queue(&info->event_wait_q, &wait);
2059
2060 spin_unlock_irqrestore(&info->lock,flags);
2061
2062
2063 for(;;) {
2064 schedule();
2065 if (signal_pending(current)) {
2066 rc = -ERESTARTSYS;
2067 break;
2068 }
2069
2070 /* get current irq counts */
2071 spin_lock_irqsave(&info->lock,flags);
2072 cnow = info->icount;
2073 newsigs = info->input_signal_events;
2074 set_current_state(TASK_INTERRUPTIBLE);
2075 spin_unlock_irqrestore(&info->lock,flags);
2076
2077 /* if no change, wait aborted for some reason */
2078 if (newsigs.dsr_up == oldsigs.dsr_up &&
2079 newsigs.dsr_down == oldsigs.dsr_down &&
2080 newsigs.dcd_up == oldsigs.dcd_up &&
2081 newsigs.dcd_down == oldsigs.dcd_down &&
2082 newsigs.cts_up == oldsigs.cts_up &&
2083 newsigs.cts_down == oldsigs.cts_down &&
2084 newsigs.ri_up == oldsigs.ri_up &&
2085 newsigs.ri_down == oldsigs.ri_down &&
2086 cnow.exithunt == cprev.exithunt &&
2087 cnow.rxidle == cprev.rxidle) {
2088 rc = -EIO;
2089 break;
2090 }
2091
2092 events = mask &
2093 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2094 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2095 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2096 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2097 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2098 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2099 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2100 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2101 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2102 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2103 if (events)
2104 break;
2105
2106 cprev = cnow;
2107 oldsigs = newsigs;
2108 }
2109
2110 remove_wait_queue(&info->event_wait_q, &wait);
2111 set_current_state(TASK_RUNNING);
2112
2113 if (mask & MgslEvent_ExitHuntMode) {
2114 spin_lock_irqsave(&info->lock,flags);
2115 if (!waitqueue_active(&info->event_wait_q))
2116 irq_disable(info, CHA, IRQ_EXITHUNT);
2117 spin_unlock_irqrestore(&info->lock,flags);
2118 }
2119 exit:
2120 if (rc == 0)
2121 PUT_USER(rc, events, mask_ptr);
2122 return rc;
2123 }
2124
modem_input_wait(MGSLPC_INFO * info,int arg)2125 static int modem_input_wait(MGSLPC_INFO *info,int arg)
2126 {
2127 unsigned long flags;
2128 int rc;
2129 struct mgsl_icount cprev, cnow;
2130 DECLARE_WAITQUEUE(wait, current);
2131
2132 /* save current irq counts */
2133 spin_lock_irqsave(&info->lock,flags);
2134 cprev = info->icount;
2135 add_wait_queue(&info->status_event_wait_q, &wait);
2136 set_current_state(TASK_INTERRUPTIBLE);
2137 spin_unlock_irqrestore(&info->lock,flags);
2138
2139 for(;;) {
2140 schedule();
2141 if (signal_pending(current)) {
2142 rc = -ERESTARTSYS;
2143 break;
2144 }
2145
2146 /* get new irq counts */
2147 spin_lock_irqsave(&info->lock,flags);
2148 cnow = info->icount;
2149 set_current_state(TASK_INTERRUPTIBLE);
2150 spin_unlock_irqrestore(&info->lock,flags);
2151
2152 /* if no change, wait aborted for some reason */
2153 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2154 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2155 rc = -EIO;
2156 break;
2157 }
2158
2159 /* check for change in caller specified modem input */
2160 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2161 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2162 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2163 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2164 rc = 0;
2165 break;
2166 }
2167
2168 cprev = cnow;
2169 }
2170 remove_wait_queue(&info->status_event_wait_q, &wait);
2171 set_current_state(TASK_RUNNING);
2172 return rc;
2173 }
2174
2175 /* return the state of the serial control and status signals
2176 */
tiocmget(struct tty_struct * tty,struct file * file)2177 static int tiocmget(struct tty_struct *tty, struct file *file)
2178 {
2179 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2180 unsigned int result;
2181 unsigned long flags;
2182
2183 spin_lock_irqsave(&info->lock,flags);
2184 get_signals(info);
2185 spin_unlock_irqrestore(&info->lock,flags);
2186
2187 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2188 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2189 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2190 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2191 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2192 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2193
2194 if (debug_level >= DEBUG_LEVEL_INFO)
2195 printk("%s(%d):%s tiocmget() value=%08X\n",
2196 __FILE__,__LINE__, info->device_name, result );
2197 return result;
2198 }
2199
2200 /* set modem control signals (DTR/RTS)
2201 */
tiocmset(struct tty_struct * tty,struct file * file,unsigned int set,unsigned int clear)2202 static int tiocmset(struct tty_struct *tty, struct file *file,
2203 unsigned int set, unsigned int clear)
2204 {
2205 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2206 unsigned long flags;
2207
2208 if (debug_level >= DEBUG_LEVEL_INFO)
2209 printk("%s(%d):%s tiocmset(%x,%x)\n",
2210 __FILE__,__LINE__,info->device_name, set, clear);
2211
2212 if (set & TIOCM_RTS)
2213 info->serial_signals |= SerialSignal_RTS;
2214 if (set & TIOCM_DTR)
2215 info->serial_signals |= SerialSignal_DTR;
2216 if (clear & TIOCM_RTS)
2217 info->serial_signals &= ~SerialSignal_RTS;
2218 if (clear & TIOCM_DTR)
2219 info->serial_signals &= ~SerialSignal_DTR;
2220
2221 spin_lock_irqsave(&info->lock,flags);
2222 set_signals(info);
2223 spin_unlock_irqrestore(&info->lock,flags);
2224
2225 return 0;
2226 }
2227
2228 /* Set or clear transmit break condition
2229 *
2230 * Arguments: tty pointer to tty instance data
2231 * break_state -1=set break condition, 0=clear
2232 */
mgslpc_break(struct tty_struct * tty,int break_state)2233 static int mgslpc_break(struct tty_struct *tty, int break_state)
2234 {
2235 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2236 unsigned long flags;
2237
2238 if (debug_level >= DEBUG_LEVEL_INFO)
2239 printk("%s(%d):mgslpc_break(%s,%d)\n",
2240 __FILE__,__LINE__, info->device_name, break_state);
2241
2242 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_break"))
2243 return -EINVAL;
2244
2245 spin_lock_irqsave(&info->lock,flags);
2246 if (break_state == -1)
2247 set_reg_bits(info, CHA+DAFO, BIT6);
2248 else
2249 clear_reg_bits(info, CHA+DAFO, BIT6);
2250 spin_unlock_irqrestore(&info->lock,flags);
2251 return 0;
2252 }
2253
2254 /* Service an IOCTL request
2255 *
2256 * Arguments:
2257 *
2258 * tty pointer to tty instance data
2259 * file pointer to associated file object for device
2260 * cmd IOCTL command code
2261 * arg command argument/context
2262 *
2263 * Return Value: 0 if success, otherwise error code
2264 */
mgslpc_ioctl(struct tty_struct * tty,struct file * file,unsigned int cmd,unsigned long arg)2265 static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
2266 unsigned int cmd, unsigned long arg)
2267 {
2268 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2269 int error;
2270 struct mgsl_icount cnow; /* kernel counter temps */
2271 struct serial_icounter_struct __user *p_cuser; /* user space */
2272 void __user *argp = (void __user *)arg;
2273 unsigned long flags;
2274
2275 if (debug_level >= DEBUG_LEVEL_INFO)
2276 printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2277 info->device_name, cmd );
2278
2279 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_ioctl"))
2280 return -ENODEV;
2281
2282 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2283 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2284 if (tty->flags & (1 << TTY_IO_ERROR))
2285 return -EIO;
2286 }
2287
2288 switch (cmd) {
2289 case MGSL_IOCGPARAMS:
2290 return get_params(info, argp);
2291 case MGSL_IOCSPARAMS:
2292 return set_params(info, argp, tty);
2293 case MGSL_IOCGTXIDLE:
2294 return get_txidle(info, argp);
2295 case MGSL_IOCSTXIDLE:
2296 return set_txidle(info, (int)arg);
2297 case MGSL_IOCGIF:
2298 return get_interface(info, argp);
2299 case MGSL_IOCSIF:
2300 return set_interface(info,(int)arg);
2301 case MGSL_IOCTXENABLE:
2302 return set_txenable(info,(int)arg, tty);
2303 case MGSL_IOCRXENABLE:
2304 return set_rxenable(info,(int)arg);
2305 case MGSL_IOCTXABORT:
2306 return tx_abort(info);
2307 case MGSL_IOCGSTATS:
2308 return get_stats(info, argp);
2309 case MGSL_IOCWAITEVENT:
2310 return wait_events(info, argp);
2311 case TIOCMIWAIT:
2312 return modem_input_wait(info,(int)arg);
2313 case TIOCGICOUNT:
2314 spin_lock_irqsave(&info->lock,flags);
2315 cnow = info->icount;
2316 spin_unlock_irqrestore(&info->lock,flags);
2317 p_cuser = argp;
2318 PUT_USER(error,cnow.cts, &p_cuser->cts);
2319 if (error) return error;
2320 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
2321 if (error) return error;
2322 PUT_USER(error,cnow.rng, &p_cuser->rng);
2323 if (error) return error;
2324 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
2325 if (error) return error;
2326 PUT_USER(error,cnow.rx, &p_cuser->rx);
2327 if (error) return error;
2328 PUT_USER(error,cnow.tx, &p_cuser->tx);
2329 if (error) return error;
2330 PUT_USER(error,cnow.frame, &p_cuser->frame);
2331 if (error) return error;
2332 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
2333 if (error) return error;
2334 PUT_USER(error,cnow.parity, &p_cuser->parity);
2335 if (error) return error;
2336 PUT_USER(error,cnow.brk, &p_cuser->brk);
2337 if (error) return error;
2338 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
2339 if (error) return error;
2340 return 0;
2341 default:
2342 return -ENOIOCTLCMD;
2343 }
2344 return 0;
2345 }
2346
2347 /* Set new termios settings
2348 *
2349 * Arguments:
2350 *
2351 * tty pointer to tty structure
2352 * termios pointer to buffer to hold returned old termios
2353 */
mgslpc_set_termios(struct tty_struct * tty,struct ktermios * old_termios)2354 static void mgslpc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
2355 {
2356 MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
2357 unsigned long flags;
2358
2359 if (debug_level >= DEBUG_LEVEL_INFO)
2360 printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
2361 tty->driver->name );
2362
2363 /* just return if nothing has changed */
2364 if ((tty->termios->c_cflag == old_termios->c_cflag)
2365 && (RELEVANT_IFLAG(tty->termios->c_iflag)
2366 == RELEVANT_IFLAG(old_termios->c_iflag)))
2367 return;
2368
2369 mgslpc_change_params(info, tty);
2370
2371 /* Handle transition to B0 status */
2372 if (old_termios->c_cflag & CBAUD &&
2373 !(tty->termios->c_cflag & CBAUD)) {
2374 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2375 spin_lock_irqsave(&info->lock,flags);
2376 set_signals(info);
2377 spin_unlock_irqrestore(&info->lock,flags);
2378 }
2379
2380 /* Handle transition away from B0 status */
2381 if (!(old_termios->c_cflag & CBAUD) &&
2382 tty->termios->c_cflag & CBAUD) {
2383 info->serial_signals |= SerialSignal_DTR;
2384 if (!(tty->termios->c_cflag & CRTSCTS) ||
2385 !test_bit(TTY_THROTTLED, &tty->flags)) {
2386 info->serial_signals |= SerialSignal_RTS;
2387 }
2388 spin_lock_irqsave(&info->lock,flags);
2389 set_signals(info);
2390 spin_unlock_irqrestore(&info->lock,flags);
2391 }
2392
2393 /* Handle turning off CRTSCTS */
2394 if (old_termios->c_cflag & CRTSCTS &&
2395 !(tty->termios->c_cflag & CRTSCTS)) {
2396 tty->hw_stopped = 0;
2397 tx_release(tty);
2398 }
2399 }
2400
mgslpc_close(struct tty_struct * tty,struct file * filp)2401 static void mgslpc_close(struct tty_struct *tty, struct file * filp)
2402 {
2403 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2404 struct tty_port *port = &info->port;
2405
2406 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_close"))
2407 return;
2408
2409 if (debug_level >= DEBUG_LEVEL_INFO)
2410 printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
2411 __FILE__,__LINE__, info->device_name, port->count);
2412
2413 WARN_ON(!port->count);
2414
2415 if (tty_port_close_start(port, tty, filp) == 0)
2416 goto cleanup;
2417
2418 if (port->flags & ASYNC_INITIALIZED)
2419 mgslpc_wait_until_sent(tty, info->timeout);
2420
2421 mgslpc_flush_buffer(tty);
2422
2423 tty_ldisc_flush(tty);
2424 shutdown(info, tty);
2425
2426 tty_port_close_end(port, tty);
2427 tty_port_tty_set(port, NULL);
2428 cleanup:
2429 if (debug_level >= DEBUG_LEVEL_INFO)
2430 printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
2431 tty->driver->name, port->count);
2432 }
2433
2434 /* Wait until the transmitter is empty.
2435 */
mgslpc_wait_until_sent(struct tty_struct * tty,int timeout)2436 static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
2437 {
2438 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2439 unsigned long orig_jiffies, char_time;
2440
2441 if (!info )
2442 return;
2443
2444 if (debug_level >= DEBUG_LEVEL_INFO)
2445 printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
2446 __FILE__,__LINE__, info->device_name );
2447
2448 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_wait_until_sent"))
2449 return;
2450
2451 if (!(info->port.flags & ASYNC_INITIALIZED))
2452 goto exit;
2453
2454 orig_jiffies = jiffies;
2455
2456 /* Set check interval to 1/5 of estimated time to
2457 * send a character, and make it at least 1. The check
2458 * interval should also be less than the timeout.
2459 * Note: use tight timings here to satisfy the NIST-PCTS.
2460 */
2461
2462 if ( info->params.data_rate ) {
2463 char_time = info->timeout/(32 * 5);
2464 if (!char_time)
2465 char_time++;
2466 } else
2467 char_time = 1;
2468
2469 if (timeout)
2470 char_time = min_t(unsigned long, char_time, timeout);
2471
2472 if (info->params.mode == MGSL_MODE_HDLC) {
2473 while (info->tx_active) {
2474 msleep_interruptible(jiffies_to_msecs(char_time));
2475 if (signal_pending(current))
2476 break;
2477 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2478 break;
2479 }
2480 } else {
2481 while ((info->tx_count || info->tx_active) &&
2482 info->tx_enabled) {
2483 msleep_interruptible(jiffies_to_msecs(char_time));
2484 if (signal_pending(current))
2485 break;
2486 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2487 break;
2488 }
2489 }
2490
2491 exit:
2492 if (debug_level >= DEBUG_LEVEL_INFO)
2493 printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
2494 __FILE__,__LINE__, info->device_name );
2495 }
2496
2497 /* Called by tty_hangup() when a hangup is signaled.
2498 * This is the same as closing all open files for the port.
2499 */
mgslpc_hangup(struct tty_struct * tty)2500 static void mgslpc_hangup(struct tty_struct *tty)
2501 {
2502 MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
2503
2504 if (debug_level >= DEBUG_LEVEL_INFO)
2505 printk("%s(%d):mgslpc_hangup(%s)\n",
2506 __FILE__,__LINE__, info->device_name );
2507
2508 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_hangup"))
2509 return;
2510
2511 mgslpc_flush_buffer(tty);
2512 shutdown(info, tty);
2513 tty_port_hangup(&info->port);
2514 }
2515
carrier_raised(struct tty_port * port)2516 static int carrier_raised(struct tty_port *port)
2517 {
2518 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2519 unsigned long flags;
2520
2521 spin_lock_irqsave(&info->lock,flags);
2522 get_signals(info);
2523 spin_unlock_irqrestore(&info->lock,flags);
2524
2525 if (info->serial_signals & SerialSignal_DCD)
2526 return 1;
2527 return 0;
2528 }
2529
raise_dtr_rts(struct tty_port * port)2530 static void raise_dtr_rts(struct tty_port *port)
2531 {
2532 MGSLPC_INFO *info = container_of(port, MGSLPC_INFO, port);
2533 unsigned long flags;
2534
2535 spin_lock_irqsave(&info->lock,flags);
2536 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2537 set_signals(info);
2538 spin_unlock_irqrestore(&info->lock,flags);
2539 }
2540
2541
mgslpc_open(struct tty_struct * tty,struct file * filp)2542 static int mgslpc_open(struct tty_struct *tty, struct file * filp)
2543 {
2544 MGSLPC_INFO *info;
2545 struct tty_port *port;
2546 int retval, line;
2547 unsigned long flags;
2548
2549 /* verify range of specified line number */
2550 line = tty->index;
2551 if ((line < 0) || (line >= mgslpc_device_count)) {
2552 printk("%s(%d):mgslpc_open with invalid line #%d.\n",
2553 __FILE__,__LINE__,line);
2554 return -ENODEV;
2555 }
2556
2557 /* find the info structure for the specified line */
2558 info = mgslpc_device_list;
2559 while(info && info->line != line)
2560 info = info->next_device;
2561 if (mgslpc_paranoia_check(info, tty->name, "mgslpc_open"))
2562 return -ENODEV;
2563
2564 port = &info->port;
2565 tty->driver_data = info;
2566 tty_port_tty_set(port, tty);
2567
2568 if (debug_level >= DEBUG_LEVEL_INFO)
2569 printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
2570 __FILE__,__LINE__,tty->driver->name, port->count);
2571
2572 /* If port is closing, signal caller to try again */
2573 if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
2574 if (port->flags & ASYNC_CLOSING)
2575 interruptible_sleep_on(&port->close_wait);
2576 retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
2577 -EAGAIN : -ERESTARTSYS);
2578 goto cleanup;
2579 }
2580
2581 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
2582
2583 spin_lock_irqsave(&info->netlock, flags);
2584 if (info->netcount) {
2585 retval = -EBUSY;
2586 spin_unlock_irqrestore(&info->netlock, flags);
2587 goto cleanup;
2588 }
2589 spin_lock(&port->lock);
2590 port->count++;
2591 spin_unlock(&port->lock);
2592 spin_unlock_irqrestore(&info->netlock, flags);
2593
2594 if (port->count == 1) {
2595 /* 1st open on this device, init hardware */
2596 retval = startup(info, tty);
2597 if (retval < 0)
2598 goto cleanup;
2599 }
2600
2601 retval = tty_port_block_til_ready(&info->port, tty, filp);
2602 if (retval) {
2603 if (debug_level >= DEBUG_LEVEL_INFO)
2604 printk("%s(%d):block_til_ready(%s) returned %d\n",
2605 __FILE__,__LINE__, info->device_name, retval);
2606 goto cleanup;
2607 }
2608
2609 if (debug_level >= DEBUG_LEVEL_INFO)
2610 printk("%s(%d):mgslpc_open(%s) success\n",
2611 __FILE__,__LINE__, info->device_name);
2612 retval = 0;
2613
2614 cleanup:
2615 return retval;
2616 }
2617
2618 /*
2619 * /proc fs routines....
2620 */
2621
line_info(char * buf,MGSLPC_INFO * info)2622 static inline int line_info(char *buf, MGSLPC_INFO *info)
2623 {
2624 char stat_buf[30];
2625 int ret;
2626 unsigned long flags;
2627
2628 ret = sprintf(buf, "%s:io:%04X irq:%d",
2629 info->device_name, info->io_base, info->irq_level);
2630
2631 /* output current serial signal states */
2632 spin_lock_irqsave(&info->lock,flags);
2633 get_signals(info);
2634 spin_unlock_irqrestore(&info->lock,flags);
2635
2636 stat_buf[0] = 0;
2637 stat_buf[1] = 0;
2638 if (info->serial_signals & SerialSignal_RTS)
2639 strcat(stat_buf, "|RTS");
2640 if (info->serial_signals & SerialSignal_CTS)
2641 strcat(stat_buf, "|CTS");
2642 if (info->serial_signals & SerialSignal_DTR)
2643 strcat(stat_buf, "|DTR");
2644 if (info->serial_signals & SerialSignal_DSR)
2645 strcat(stat_buf, "|DSR");
2646 if (info->serial_signals & SerialSignal_DCD)
2647 strcat(stat_buf, "|CD");
2648 if (info->serial_signals & SerialSignal_RI)
2649 strcat(stat_buf, "|RI");
2650
2651 if (info->params.mode == MGSL_MODE_HDLC) {
2652 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
2653 info->icount.txok, info->icount.rxok);
2654 if (info->icount.txunder)
2655 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
2656 if (info->icount.txabort)
2657 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
2658 if (info->icount.rxshort)
2659 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
2660 if (info->icount.rxlong)
2661 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
2662 if (info->icount.rxover)
2663 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
2664 if (info->icount.rxcrc)
2665 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
2666 } else {
2667 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
2668 info->icount.tx, info->icount.rx);
2669 if (info->icount.frame)
2670 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
2671 if (info->icount.parity)
2672 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
2673 if (info->icount.brk)
2674 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
2675 if (info->icount.overrun)
2676 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
2677 }
2678
2679 /* Append serial signal status to end */
2680 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
2681
2682 ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
2683 info->tx_active,info->bh_requested,info->bh_running,
2684 info->pending_bh);
2685
2686 return ret;
2687 }
2688
2689 /* Called to print information about devices
2690 */
mgslpc_read_proc(char * page,char ** start,off_t off,int count,int * eof,void * data)2691 static int mgslpc_read_proc(char *page, char **start, off_t off, int count,
2692 int *eof, void *data)
2693 {
2694 int len = 0, l;
2695 off_t begin = 0;
2696 MGSLPC_INFO *info;
2697
2698 len += sprintf(page, "synclink driver:%s\n", driver_version);
2699
2700 info = mgslpc_device_list;
2701 while( info ) {
2702 l = line_info(page + len, info);
2703 len += l;
2704 if (len+begin > off+count)
2705 goto done;
2706 if (len+begin < off) {
2707 begin += len;
2708 len = 0;
2709 }
2710 info = info->next_device;
2711 }
2712
2713 *eof = 1;
2714 done:
2715 if (off >= len+begin)
2716 return 0;
2717 *start = page + (off-begin);
2718 return ((count < begin+len-off) ? count : begin+len-off);
2719 }
2720
rx_alloc_buffers(MGSLPC_INFO * info)2721 static int rx_alloc_buffers(MGSLPC_INFO *info)
2722 {
2723 /* each buffer has header and data */
2724 info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
2725
2726 /* calculate total allocation size for 8 buffers */
2727 info->rx_buf_total_size = info->rx_buf_size * 8;
2728
2729 /* limit total allocated memory */
2730 if (info->rx_buf_total_size > 0x10000)
2731 info->rx_buf_total_size = 0x10000;
2732
2733 /* calculate number of buffers */
2734 info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
2735
2736 info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
2737 if (info->rx_buf == NULL)
2738 return -ENOMEM;
2739
2740 rx_reset_buffers(info);
2741 return 0;
2742 }
2743
rx_free_buffers(MGSLPC_INFO * info)2744 static void rx_free_buffers(MGSLPC_INFO *info)
2745 {
2746 kfree(info->rx_buf);
2747 info->rx_buf = NULL;
2748 }
2749
claim_resources(MGSLPC_INFO * info)2750 static int claim_resources(MGSLPC_INFO *info)
2751 {
2752 if (rx_alloc_buffers(info) < 0 ) {
2753 printk( "Cant allocate rx buffer %s\n", info->device_name);
2754 release_resources(info);
2755 return -ENODEV;
2756 }
2757 return 0;
2758 }
2759
release_resources(MGSLPC_INFO * info)2760 static void release_resources(MGSLPC_INFO *info)
2761 {
2762 if (debug_level >= DEBUG_LEVEL_INFO)
2763 printk("release_resources(%s)\n", info->device_name);
2764 rx_free_buffers(info);
2765 }
2766
2767 /* Add the specified device instance data structure to the
2768 * global linked list of devices and increment the device count.
2769 *
2770 * Arguments: info pointer to device instance data
2771 */
mgslpc_add_device(MGSLPC_INFO * info)2772 static void mgslpc_add_device(MGSLPC_INFO *info)
2773 {
2774 info->next_device = NULL;
2775 info->line = mgslpc_device_count;
2776 sprintf(info->device_name,"ttySLP%d",info->line);
2777
2778 if (info->line < MAX_DEVICE_COUNT) {
2779 if (maxframe[info->line])
2780 info->max_frame_size = maxframe[info->line];
2781 }
2782
2783 mgslpc_device_count++;
2784
2785 if (!mgslpc_device_list)
2786 mgslpc_device_list = info;
2787 else {
2788 MGSLPC_INFO *current_dev = mgslpc_device_list;
2789 while( current_dev->next_device )
2790 current_dev = current_dev->next_device;
2791 current_dev->next_device = info;
2792 }
2793
2794 if (info->max_frame_size < 4096)
2795 info->max_frame_size = 4096;
2796 else if (info->max_frame_size > 65535)
2797 info->max_frame_size = 65535;
2798
2799 printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
2800 info->device_name, info->io_base, info->irq_level);
2801
2802 #if SYNCLINK_GENERIC_HDLC
2803 hdlcdev_init(info);
2804 #endif
2805 }
2806
mgslpc_remove_device(MGSLPC_INFO * remove_info)2807 static void mgslpc_remove_device(MGSLPC_INFO *remove_info)
2808 {
2809 MGSLPC_INFO *info = mgslpc_device_list;
2810 MGSLPC_INFO *last = NULL;
2811
2812 while(info) {
2813 if (info == remove_info) {
2814 if (last)
2815 last->next_device = info->next_device;
2816 else
2817 mgslpc_device_list = info->next_device;
2818 #if SYNCLINK_GENERIC_HDLC
2819 hdlcdev_exit(info);
2820 #endif
2821 release_resources(info);
2822 kfree(info);
2823 mgslpc_device_count--;
2824 return;
2825 }
2826 last = info;
2827 info = info->next_device;
2828 }
2829 }
2830
2831 static struct pcmcia_device_id mgslpc_ids[] = {
2832 PCMCIA_DEVICE_MANF_CARD(0x02c5, 0x0050),
2833 PCMCIA_DEVICE_NULL
2834 };
2835 MODULE_DEVICE_TABLE(pcmcia, mgslpc_ids);
2836
2837 static struct pcmcia_driver mgslpc_driver = {
2838 .owner = THIS_MODULE,
2839 .drv = {
2840 .name = "synclink_cs",
2841 },
2842 .probe = mgslpc_probe,
2843 .remove = mgslpc_detach,
2844 .id_table = mgslpc_ids,
2845 .suspend = mgslpc_suspend,
2846 .resume = mgslpc_resume,
2847 };
2848
2849 static const struct tty_operations mgslpc_ops = {
2850 .open = mgslpc_open,
2851 .close = mgslpc_close,
2852 .write = mgslpc_write,
2853 .put_char = mgslpc_put_char,
2854 .flush_chars = mgslpc_flush_chars,
2855 .write_room = mgslpc_write_room,
2856 .chars_in_buffer = mgslpc_chars_in_buffer,
2857 .flush_buffer = mgslpc_flush_buffer,
2858 .ioctl = mgslpc_ioctl,
2859 .throttle = mgslpc_throttle,
2860 .unthrottle = mgslpc_unthrottle,
2861 .send_xchar = mgslpc_send_xchar,
2862 .break_ctl = mgslpc_break,
2863 .wait_until_sent = mgslpc_wait_until_sent,
2864 .read_proc = mgslpc_read_proc,
2865 .set_termios = mgslpc_set_termios,
2866 .stop = tx_pause,
2867 .start = tx_release,
2868 .hangup = mgslpc_hangup,
2869 .tiocmget = tiocmget,
2870 .tiocmset = tiocmset,
2871 };
2872
synclink_cs_cleanup(void)2873 static void synclink_cs_cleanup(void)
2874 {
2875 int rc;
2876
2877 printk("Unloading %s: version %s\n", driver_name, driver_version);
2878
2879 while(mgslpc_device_list)
2880 mgslpc_remove_device(mgslpc_device_list);
2881
2882 if (serial_driver) {
2883 if ((rc = tty_unregister_driver(serial_driver)))
2884 printk("%s(%d) failed to unregister tty driver err=%d\n",
2885 __FILE__,__LINE__,rc);
2886 put_tty_driver(serial_driver);
2887 }
2888
2889 pcmcia_unregister_driver(&mgslpc_driver);
2890 }
2891
synclink_cs_init(void)2892 static int __init synclink_cs_init(void)
2893 {
2894 int rc;
2895
2896 if (break_on_load) {
2897 mgslpc_get_text_ptr();
2898 BREAKPOINT();
2899 }
2900
2901 printk("%s %s\n", driver_name, driver_version);
2902
2903 if ((rc = pcmcia_register_driver(&mgslpc_driver)) < 0)
2904 return rc;
2905
2906 serial_driver = alloc_tty_driver(MAX_DEVICE_COUNT);
2907 if (!serial_driver) {
2908 rc = -ENOMEM;
2909 goto error;
2910 }
2911
2912 /* Initialize the tty_driver structure */
2913
2914 serial_driver->owner = THIS_MODULE;
2915 serial_driver->driver_name = "synclink_cs";
2916 serial_driver->name = "ttySLP";
2917 serial_driver->major = ttymajor;
2918 serial_driver->minor_start = 64;
2919 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2920 serial_driver->subtype = SERIAL_TYPE_NORMAL;
2921 serial_driver->init_termios = tty_std_termios;
2922 serial_driver->init_termios.c_cflag =
2923 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2924 serial_driver->flags = TTY_DRIVER_REAL_RAW;
2925 tty_set_operations(serial_driver, &mgslpc_ops);
2926
2927 if ((rc = tty_register_driver(serial_driver)) < 0) {
2928 printk("%s(%d):Couldn't register serial driver\n",
2929 __FILE__,__LINE__);
2930 put_tty_driver(serial_driver);
2931 serial_driver = NULL;
2932 goto error;
2933 }
2934
2935 printk("%s %s, tty major#%d\n",
2936 driver_name, driver_version,
2937 serial_driver->major);
2938
2939 return 0;
2940
2941 error:
2942 synclink_cs_cleanup();
2943 return rc;
2944 }
2945
synclink_cs_exit(void)2946 static void __exit synclink_cs_exit(void)
2947 {
2948 synclink_cs_cleanup();
2949 }
2950
2951 module_init(synclink_cs_init);
2952 module_exit(synclink_cs_exit);
2953
mgslpc_set_rate(MGSLPC_INFO * info,unsigned char channel,unsigned int rate)2954 static void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
2955 {
2956 unsigned int M, N;
2957 unsigned char val;
2958
2959 /* note:standard BRG mode is broken in V3.2 chip
2960 * so enhanced mode is always used
2961 */
2962
2963 if (rate) {
2964 N = 3686400 / rate;
2965 if (!N)
2966 N = 1;
2967 N >>= 1;
2968 for (M = 1; N > 64 && M < 16; M++)
2969 N >>= 1;
2970 N--;
2971
2972 /* BGR[5..0] = N
2973 * BGR[9..6] = M
2974 * BGR[7..0] contained in BGR register
2975 * BGR[9..8] contained in CCR2[7..6]
2976 * divisor = (N+1)*2^M
2977 *
2978 * Note: M *must* not be zero (causes asymetric duty cycle)
2979 */
2980 write_reg(info, (unsigned char) (channel + BGR),
2981 (unsigned char) ((M << 6) + N));
2982 val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
2983 val |= ((M << 4) & 0xc0);
2984 write_reg(info, (unsigned char) (channel + CCR2), val);
2985 }
2986 }
2987
2988 /* Enabled the AUX clock output at the specified frequency.
2989 */
enable_auxclk(MGSLPC_INFO * info)2990 static void enable_auxclk(MGSLPC_INFO *info)
2991 {
2992 unsigned char val;
2993
2994 /* MODE
2995 *
2996 * 07..06 MDS[1..0] 10 = transparent HDLC mode
2997 * 05 ADM Address Mode, 0 = no addr recognition
2998 * 04 TMD Timer Mode, 0 = external
2999 * 03 RAC Receiver Active, 0 = inactive
3000 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3001 * 01 TRS Timer Resolution, 1=512
3002 * 00 TLP Test Loop, 0 = no loop
3003 *
3004 * 1000 0010
3005 */
3006 val = 0x82;
3007
3008 /* channel B RTS is used to enable AUXCLK driver on SP505 */
3009 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3010 val |= BIT2;
3011 write_reg(info, CHB + MODE, val);
3012
3013 /* CCR0
3014 *
3015 * 07 PU Power Up, 1=active, 0=power down
3016 * 06 MCE Master Clock Enable, 1=enabled
3017 * 05 Reserved, 0
3018 * 04..02 SC[2..0] Encoding
3019 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3020 *
3021 * 11000000
3022 */
3023 write_reg(info, CHB + CCR0, 0xc0);
3024
3025 /* CCR1
3026 *
3027 * 07 SFLG Shared Flag, 0 = disable shared flags
3028 * 06 GALP Go Active On Loop, 0 = not used
3029 * 05 GLP Go On Loop, 0 = not used
3030 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3031 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3032 * 02..00 CM[2..0] Clock Mode
3033 *
3034 * 0001 0111
3035 */
3036 write_reg(info, CHB + CCR1, 0x17);
3037
3038 /* CCR2 (Channel B)
3039 *
3040 * 07..06 BGR[9..8] Baud rate bits 9..8
3041 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3042 * 04 SSEL Clock source select, 1=submode b
3043 * 03 TOE 0=TxCLK is input, 1=TxCLK is output
3044 * 02 RWX Read/Write Exchange 0=disabled
3045 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3046 * 00 DIV, data inversion 0=disabled, 1=enabled
3047 *
3048 * 0011 1000
3049 */
3050 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3051 write_reg(info, CHB + CCR2, 0x38);
3052 else
3053 write_reg(info, CHB + CCR2, 0x30);
3054
3055 /* CCR4
3056 *
3057 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3058 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3059 * 05 TST1 Test Pin, 0=normal operation
3060 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3061 * 03..02 Reserved, must be 0
3062 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3063 *
3064 * 0101 0000
3065 */
3066 write_reg(info, CHB + CCR4, 0x50);
3067
3068 /* if auxclk not enabled, set internal BRG so
3069 * CTS transitions can be detected (requires TxC)
3070 */
3071 if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
3072 mgslpc_set_rate(info, CHB, info->params.clock_speed);
3073 else
3074 mgslpc_set_rate(info, CHB, 921600);
3075 }
3076
loopback_enable(MGSLPC_INFO * info)3077 static void loopback_enable(MGSLPC_INFO *info)
3078 {
3079 unsigned char val;
3080
3081 /* CCR1:02..00 CM[2..0] Clock Mode = 111 (clock mode 7) */
3082 val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
3083 write_reg(info, CHA + CCR1, val);
3084
3085 /* CCR2:04 SSEL Clock source select, 1=submode b */
3086 val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
3087 write_reg(info, CHA + CCR2, val);
3088
3089 /* set LinkSpeed if available, otherwise default to 2Mbps */
3090 if (info->params.clock_speed)
3091 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3092 else
3093 mgslpc_set_rate(info, CHA, 1843200);
3094
3095 /* MODE:00 TLP Test Loop, 1=loopback enabled */
3096 val = read_reg(info, CHA + MODE) | BIT0;
3097 write_reg(info, CHA + MODE, val);
3098 }
3099
hdlc_mode(MGSLPC_INFO * info)3100 static void hdlc_mode(MGSLPC_INFO *info)
3101 {
3102 unsigned char val;
3103 unsigned char clkmode, clksubmode;
3104
3105 /* disable all interrupts */
3106 irq_disable(info, CHA, 0xffff);
3107 irq_disable(info, CHB, 0xffff);
3108 port_irq_disable(info, 0xff);
3109
3110 /* assume clock mode 0a, rcv=RxC xmt=TxC */
3111 clkmode = clksubmode = 0;
3112 if (info->params.flags & HDLC_FLAG_RXC_DPLL
3113 && info->params.flags & HDLC_FLAG_TXC_DPLL) {
3114 /* clock mode 7a, rcv = DPLL, xmt = DPLL */
3115 clkmode = 7;
3116 } else if (info->params.flags & HDLC_FLAG_RXC_BRG
3117 && info->params.flags & HDLC_FLAG_TXC_BRG) {
3118 /* clock mode 7b, rcv = BRG, xmt = BRG */
3119 clkmode = 7;
3120 clksubmode = 1;
3121 } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
3122 if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3123 /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
3124 clkmode = 6;
3125 clksubmode = 1;
3126 } else {
3127 /* clock mode 6a, rcv = DPLL, xmt = TxC */
3128 clkmode = 6;
3129 }
3130 } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
3131 /* clock mode 0b, rcv = RxC, xmt = BRG */
3132 clksubmode = 1;
3133 }
3134
3135 /* MODE
3136 *
3137 * 07..06 MDS[1..0] 10 = transparent HDLC mode
3138 * 05 ADM Address Mode, 0 = no addr recognition
3139 * 04 TMD Timer Mode, 0 = external
3140 * 03 RAC Receiver Active, 0 = inactive
3141 * 02 RTS 0=RTS active during xmit, 1=RTS always active
3142 * 01 TRS Timer Resolution, 1=512
3143 * 00 TLP Test Loop, 0 = no loop
3144 *
3145 * 1000 0010
3146 */
3147 val = 0x82;
3148 if (info->params.loopback)
3149 val |= BIT0;
3150
3151 /* preserve RTS state */
3152 if (info->serial_signals & SerialSignal_RTS)
3153 val |= BIT2;
3154 write_reg(info, CHA + MODE, val);
3155
3156 /* CCR0
3157 *
3158 * 07 PU Power Up, 1=active, 0=power down
3159 * 06 MCE Master Clock Enable, 1=enabled
3160 * 05 Reserved, 0
3161 * 04..02 SC[2..0] Encoding
3162 * 01..00 SM[1..0] Serial Mode, 00=HDLC
3163 *
3164 * 11000000
3165 */
3166 val = 0xc0;
3167 switch (info->params.encoding)
3168 {
3169 case HDLC_ENCODING_NRZI:
3170 val |= BIT3;
3171 break;
3172 case HDLC_ENCODING_BIPHASE_SPACE:
3173 val |= BIT4;
3174 break; // FM0
3175 case HDLC_ENCODING_BIPHASE_MARK:
3176 val |= BIT4 + BIT2;
3177 break; // FM1
3178 case HDLC_ENCODING_BIPHASE_LEVEL:
3179 val |= BIT4 + BIT3;
3180 break; // Manchester
3181 }
3182 write_reg(info, CHA + CCR0, val);
3183
3184 /* CCR1
3185 *
3186 * 07 SFLG Shared Flag, 0 = disable shared flags
3187 * 06 GALP Go Active On Loop, 0 = not used
3188 * 05 GLP Go On Loop, 0 = not used
3189 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3190 * 03 ITF Interframe Time Fill, 0=mark, 1=flag
3191 * 02..00 CM[2..0] Clock Mode
3192 *
3193 * 0001 0000
3194 */
3195 val = 0x10 + clkmode;
3196 write_reg(info, CHA + CCR1, val);
3197
3198 /* CCR2
3199 *
3200 * 07..06 BGR[9..8] Baud rate bits 9..8
3201 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3202 * 04 SSEL Clock source select, 1=submode b
3203 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3204 * 02 RWX Read/Write Exchange 0=disabled
3205 * 01 C32, CRC select, 0=CRC-16, 1=CRC-32
3206 * 00 DIV, data inversion 0=disabled, 1=enabled
3207 *
3208 * 0000 0000
3209 */
3210 val = 0x00;
3211 if (clkmode == 2 || clkmode == 3 || clkmode == 6
3212 || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
3213 val |= BIT5;
3214 if (clksubmode)
3215 val |= BIT4;
3216 if (info->params.crc_type == HDLC_CRC_32_CCITT)
3217 val |= BIT1;
3218 if (info->params.encoding == HDLC_ENCODING_NRZB)
3219 val |= BIT0;
3220 write_reg(info, CHA + CCR2, val);
3221
3222 /* CCR3
3223 *
3224 * 07..06 PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
3225 * 05 EPT Enable preamble transmission, 1=enabled
3226 * 04 RADD Receive address pushed to FIFO, 0=disabled
3227 * 03 CRL CRC Reset Level, 0=FFFF
3228 * 02 RCRC Rx CRC 0=On 1=Off
3229 * 01 TCRC Tx CRC 0=On 1=Off
3230 * 00 PSD DPLL Phase Shift Disable
3231 *
3232 * 0000 0000
3233 */
3234 val = 0x00;
3235 if (info->params.crc_type == HDLC_CRC_NONE)
3236 val |= BIT2 + BIT1;
3237 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
3238 val |= BIT5;
3239 switch (info->params.preamble_length)
3240 {
3241 case HDLC_PREAMBLE_LENGTH_16BITS:
3242 val |= BIT6;
3243 break;
3244 case HDLC_PREAMBLE_LENGTH_32BITS:
3245 val |= BIT6;
3246 break;
3247 case HDLC_PREAMBLE_LENGTH_64BITS:
3248 val |= BIT7 + BIT6;
3249 break;
3250 }
3251 write_reg(info, CHA + CCR3, val);
3252
3253 /* PRE - Preamble pattern */
3254 val = 0;
3255 switch (info->params.preamble)
3256 {
3257 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
3258 case HDLC_PREAMBLE_PATTERN_10: val = 0xaa; break;
3259 case HDLC_PREAMBLE_PATTERN_01: val = 0x55; break;
3260 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
3261 }
3262 write_reg(info, CHA + PRE, val);
3263
3264 /* CCR4
3265 *
3266 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3267 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3268 * 05 TST1 Test Pin, 0=normal operation
3269 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3270 * 03..02 Reserved, must be 0
3271 * 01..00 RFT[1..0] RxFIFO Threshold 00=32 bytes
3272 *
3273 * 0101 0000
3274 */
3275 val = 0x50;
3276 write_reg(info, CHA + CCR4, val);
3277 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
3278 mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
3279 else
3280 mgslpc_set_rate(info, CHA, info->params.clock_speed);
3281
3282 /* RLCR Receive length check register
3283 *
3284 * 7 1=enable receive length check
3285 * 6..0 Max frame length = (RL + 1) * 32
3286 */
3287 write_reg(info, CHA + RLCR, 0);
3288
3289 /* XBCH Transmit Byte Count High
3290 *
3291 * 07 DMA mode, 0 = interrupt driven
3292 * 06 NRM, 0=ABM (ignored)
3293 * 05 CAS Carrier Auto Start
3294 * 04 XC Transmit Continuously (ignored)
3295 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3296 *
3297 * 0000 0000
3298 */
3299 val = 0x00;
3300 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3301 val |= BIT5;
3302 write_reg(info, CHA + XBCH, val);
3303 enable_auxclk(info);
3304 if (info->params.loopback || info->testing_irq)
3305 loopback_enable(info);
3306 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3307 {
3308 irq_enable(info, CHB, IRQ_CTS);
3309 /* PVR[3] 1=AUTO CTS active */
3310 set_reg_bits(info, CHA + PVR, BIT3);
3311 } else
3312 clear_reg_bits(info, CHA + PVR, BIT3);
3313
3314 irq_enable(info, CHA,
3315 IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
3316 IRQ_UNDERRUN + IRQ_TXFIFO);
3317 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3318 wait_command_complete(info, CHA);
3319 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3320
3321 /* Master clock mode enabled above to allow reset commands
3322 * to complete even if no data clocks are present.
3323 *
3324 * Disable master clock mode for normal communications because
3325 * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
3326 * IRQ when in master clock mode.
3327 *
3328 * Leave master clock mode enabled for IRQ test because the
3329 * timer IRQ used by the test can only happen in master clock mode.
3330 */
3331 if (!info->testing_irq)
3332 clear_reg_bits(info, CHA + CCR0, BIT6);
3333
3334 tx_set_idle(info);
3335
3336 tx_stop(info);
3337 rx_stop(info);
3338 }
3339
rx_stop(MGSLPC_INFO * info)3340 static void rx_stop(MGSLPC_INFO *info)
3341 {
3342 if (debug_level >= DEBUG_LEVEL_ISR)
3343 printk("%s(%d):rx_stop(%s)\n",
3344 __FILE__,__LINE__, info->device_name );
3345
3346 /* MODE:03 RAC Receiver Active, 0=inactive */
3347 clear_reg_bits(info, CHA + MODE, BIT3);
3348
3349 info->rx_enabled = false;
3350 info->rx_overflow = false;
3351 }
3352
rx_start(MGSLPC_INFO * info)3353 static void rx_start(MGSLPC_INFO *info)
3354 {
3355 if (debug_level >= DEBUG_LEVEL_ISR)
3356 printk("%s(%d):rx_start(%s)\n",
3357 __FILE__,__LINE__, info->device_name );
3358
3359 rx_reset_buffers(info);
3360 info->rx_enabled = false;
3361 info->rx_overflow = false;
3362
3363 /* MODE:03 RAC Receiver Active, 1=active */
3364 set_reg_bits(info, CHA + MODE, BIT3);
3365
3366 info->rx_enabled = true;
3367 }
3368
tx_start(MGSLPC_INFO * info,struct tty_struct * tty)3369 static void tx_start(MGSLPC_INFO *info, struct tty_struct *tty)
3370 {
3371 if (debug_level >= DEBUG_LEVEL_ISR)
3372 printk("%s(%d):tx_start(%s)\n",
3373 __FILE__,__LINE__, info->device_name );
3374
3375 if (info->tx_count) {
3376 /* If auto RTS enabled and RTS is inactive, then assert */
3377 /* RTS and set a flag indicating that the driver should */
3378 /* negate RTS when the transmission completes. */
3379 info->drop_rts_on_tx_done = false;
3380
3381 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3382 get_signals(info);
3383 if (!(info->serial_signals & SerialSignal_RTS)) {
3384 info->serial_signals |= SerialSignal_RTS;
3385 set_signals(info);
3386 info->drop_rts_on_tx_done = true;
3387 }
3388 }
3389
3390 if (info->params.mode == MGSL_MODE_ASYNC) {
3391 if (!info->tx_active) {
3392 info->tx_active = true;
3393 tx_ready(info, tty);
3394 }
3395 } else {
3396 info->tx_active = true;
3397 tx_ready(info, tty);
3398 mod_timer(&info->tx_timer, jiffies +
3399 msecs_to_jiffies(5000));
3400 }
3401 }
3402
3403 if (!info->tx_enabled)
3404 info->tx_enabled = true;
3405 }
3406
tx_stop(MGSLPC_INFO * info)3407 static void tx_stop(MGSLPC_INFO *info)
3408 {
3409 if (debug_level >= DEBUG_LEVEL_ISR)
3410 printk("%s(%d):tx_stop(%s)\n",
3411 __FILE__,__LINE__, info->device_name );
3412
3413 del_timer(&info->tx_timer);
3414
3415 info->tx_enabled = false;
3416 info->tx_active = false;
3417 }
3418
3419 /* Reset the adapter to a known state and prepare it for further use.
3420 */
reset_device(MGSLPC_INFO * info)3421 static void reset_device(MGSLPC_INFO *info)
3422 {
3423 /* power up both channels (set BIT7) */
3424 write_reg(info, CHA + CCR0, 0x80);
3425 write_reg(info, CHB + CCR0, 0x80);
3426 write_reg(info, CHA + MODE, 0);
3427 write_reg(info, CHB + MODE, 0);
3428
3429 /* disable all interrupts */
3430 irq_disable(info, CHA, 0xffff);
3431 irq_disable(info, CHB, 0xffff);
3432 port_irq_disable(info, 0xff);
3433
3434 /* PCR Port Configuration Register
3435 *
3436 * 07..04 DEC[3..0] Serial I/F select outputs
3437 * 03 output, 1=AUTO CTS control enabled
3438 * 02 RI Ring Indicator input 0=active
3439 * 01 DSR input 0=active
3440 * 00 DTR output 0=active
3441 *
3442 * 0000 0110
3443 */
3444 write_reg(info, PCR, 0x06);
3445
3446 /* PVR Port Value Register
3447 *
3448 * 07..04 DEC[3..0] Serial I/F select (0000=disabled)
3449 * 03 AUTO CTS output 1=enabled
3450 * 02 RI Ring Indicator input
3451 * 01 DSR input
3452 * 00 DTR output (1=inactive)
3453 *
3454 * 0000 0001
3455 */
3456 // write_reg(info, PVR, PVR_DTR);
3457
3458 /* IPC Interrupt Port Configuration
3459 *
3460 * 07 VIS 1=Masked interrupts visible
3461 * 06..05 Reserved, 0
3462 * 04..03 SLA Slave address, 00 ignored
3463 * 02 CASM Cascading Mode, 1=daisy chain
3464 * 01..00 IC[1..0] Interrupt Config, 01=push-pull output, active low
3465 *
3466 * 0000 0101
3467 */
3468 write_reg(info, IPC, 0x05);
3469 }
3470
async_mode(MGSLPC_INFO * info)3471 static void async_mode(MGSLPC_INFO *info)
3472 {
3473 unsigned char val;
3474
3475 /* disable all interrupts */
3476 irq_disable(info, CHA, 0xffff);
3477 irq_disable(info, CHB, 0xffff);
3478 port_irq_disable(info, 0xff);
3479
3480 /* MODE
3481 *
3482 * 07 Reserved, 0
3483 * 06 FRTS RTS State, 0=active
3484 * 05 FCTS Flow Control on CTS
3485 * 04 FLON Flow Control Enable
3486 * 03 RAC Receiver Active, 0 = inactive
3487 * 02 RTS 0=Auto RTS, 1=manual RTS
3488 * 01 TRS Timer Resolution, 1=512
3489 * 00 TLP Test Loop, 0 = no loop
3490 *
3491 * 0000 0110
3492 */
3493 val = 0x06;
3494 if (info->params.loopback)
3495 val |= BIT0;
3496
3497 /* preserve RTS state */
3498 if (!(info->serial_signals & SerialSignal_RTS))
3499 val |= BIT6;
3500 write_reg(info, CHA + MODE, val);
3501
3502 /* CCR0
3503 *
3504 * 07 PU Power Up, 1=active, 0=power down
3505 * 06 MCE Master Clock Enable, 1=enabled
3506 * 05 Reserved, 0
3507 * 04..02 SC[2..0] Encoding, 000=NRZ
3508 * 01..00 SM[1..0] Serial Mode, 11=Async
3509 *
3510 * 1000 0011
3511 */
3512 write_reg(info, CHA + CCR0, 0x83);
3513
3514 /* CCR1
3515 *
3516 * 07..05 Reserved, 0
3517 * 04 ODS Output Driver Select, 1=TxD is push-pull output
3518 * 03 BCR Bit Clock Rate, 1=16x
3519 * 02..00 CM[2..0] Clock Mode, 111=BRG
3520 *
3521 * 0001 1111
3522 */
3523 write_reg(info, CHA + CCR1, 0x1f);
3524
3525 /* CCR2 (channel A)
3526 *
3527 * 07..06 BGR[9..8] Baud rate bits 9..8
3528 * 05 BDF Baud rate divisor factor, 0=1, 1=BGR value
3529 * 04 SSEL Clock source select, 1=submode b
3530 * 03 TOE 0=TxCLK is input, 0=TxCLK is input
3531 * 02 RWX Read/Write Exchange 0=disabled
3532 * 01 Reserved, 0
3533 * 00 DIV, data inversion 0=disabled, 1=enabled
3534 *
3535 * 0001 0000
3536 */
3537 write_reg(info, CHA + CCR2, 0x10);
3538
3539 /* CCR3
3540 *
3541 * 07..01 Reserved, 0
3542 * 00 PSD DPLL Phase Shift Disable
3543 *
3544 * 0000 0000
3545 */
3546 write_reg(info, CHA + CCR3, 0);
3547
3548 /* CCR4
3549 *
3550 * 07 MCK4 Master Clock Divide by 4, 1=enabled
3551 * 06 EBRG Enhanced Baud Rate Generator Mode, 1=enabled
3552 * 05 TST1 Test Pin, 0=normal operation
3553 * 04 ICD Ivert Carrier Detect, 1=enabled (active low)
3554 * 03..00 Reserved, must be 0
3555 *
3556 * 0101 0000
3557 */
3558 write_reg(info, CHA + CCR4, 0x50);
3559 mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
3560
3561 /* DAFO Data Format
3562 *
3563 * 07 Reserved, 0
3564 * 06 XBRK transmit break, 0=normal operation
3565 * 05 Stop bits (0=1, 1=2)
3566 * 04..03 PAR[1..0] Parity (01=odd, 10=even)
3567 * 02 PAREN Parity Enable
3568 * 01..00 CHL[1..0] Character Length (00=8, 01=7)
3569 *
3570 */
3571 val = 0x00;
3572 if (info->params.data_bits != 8)
3573 val |= BIT0; /* 7 bits */
3574 if (info->params.stop_bits != 1)
3575 val |= BIT5;
3576 if (info->params.parity != ASYNC_PARITY_NONE)
3577 {
3578 val |= BIT2; /* Parity enable */
3579 if (info->params.parity == ASYNC_PARITY_ODD)
3580 val |= BIT3;
3581 else
3582 val |= BIT4;
3583 }
3584 write_reg(info, CHA + DAFO, val);
3585
3586 /* RFC Rx FIFO Control
3587 *
3588 * 07 Reserved, 0
3589 * 06 DPS, 1=parity bit not stored in data byte
3590 * 05 DXS, 0=all data stored in FIFO (including XON/XOFF)
3591 * 04 RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
3592 * 03..02 RFTH[1..0], rx threshold, 11=16 status + 16 data byte
3593 * 01 Reserved, 0
3594 * 00 TCDE Terminate Char Detect Enable, 0=disabled
3595 *
3596 * 0101 1100
3597 */
3598 write_reg(info, CHA + RFC, 0x5c);
3599
3600 /* RLCR Receive length check register
3601 *
3602 * Max frame length = (RL + 1) * 32
3603 */
3604 write_reg(info, CHA + RLCR, 0);
3605
3606 /* XBCH Transmit Byte Count High
3607 *
3608 * 07 DMA mode, 0 = interrupt driven
3609 * 06 NRM, 0=ABM (ignored)
3610 * 05 CAS Carrier Auto Start
3611 * 04 XC Transmit Continuously (ignored)
3612 * 03..00 XBC[10..8] Transmit byte count bits 10..8
3613 *
3614 * 0000 0000
3615 */
3616 val = 0x00;
3617 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
3618 val |= BIT5;
3619 write_reg(info, CHA + XBCH, val);
3620 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
3621 irq_enable(info, CHA, IRQ_CTS);
3622
3623 /* MODE:03 RAC Receiver Active, 1=active */
3624 set_reg_bits(info, CHA + MODE, BIT3);
3625 enable_auxclk(info);
3626 if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
3627 irq_enable(info, CHB, IRQ_CTS);
3628 /* PVR[3] 1=AUTO CTS active */
3629 set_reg_bits(info, CHA + PVR, BIT3);
3630 } else
3631 clear_reg_bits(info, CHA + PVR, BIT3);
3632 irq_enable(info, CHA,
3633 IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
3634 IRQ_ALLSENT + IRQ_TXFIFO);
3635 issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
3636 wait_command_complete(info, CHA);
3637 read_reg16(info, CHA + ISR); /* clear pending IRQs */
3638 }
3639
3640 /* Set the HDLC idle mode for the transmitter.
3641 */
tx_set_idle(MGSLPC_INFO * info)3642 static void tx_set_idle(MGSLPC_INFO *info)
3643 {
3644 /* Note: ESCC2 only supports flags and one idle modes */
3645 if (info->idle_mode == HDLC_TXIDLE_FLAGS)
3646 set_reg_bits(info, CHA + CCR1, BIT3);
3647 else
3648 clear_reg_bits(info, CHA + CCR1, BIT3);
3649 }
3650
3651 /* get state of the V24 status (input) signals.
3652 */
get_signals(MGSLPC_INFO * info)3653 static void get_signals(MGSLPC_INFO *info)
3654 {
3655 unsigned char status = 0;
3656
3657 /* preserve DTR and RTS */
3658 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
3659
3660 if (read_reg(info, CHB + VSTR) & BIT7)
3661 info->serial_signals |= SerialSignal_DCD;
3662 if (read_reg(info, CHB + STAR) & BIT1)
3663 info->serial_signals |= SerialSignal_CTS;
3664
3665 status = read_reg(info, CHA + PVR);
3666 if (!(status & PVR_RI))
3667 info->serial_signals |= SerialSignal_RI;
3668 if (!(status & PVR_DSR))
3669 info->serial_signals |= SerialSignal_DSR;
3670 }
3671
3672 /* Set the state of DTR and RTS based on contents of
3673 * serial_signals member of device extension.
3674 */
set_signals(MGSLPC_INFO * info)3675 static void set_signals(MGSLPC_INFO *info)
3676 {
3677 unsigned char val;
3678
3679 val = read_reg(info, CHA + MODE);
3680 if (info->params.mode == MGSL_MODE_ASYNC) {
3681 if (info->serial_signals & SerialSignal_RTS)
3682 val &= ~BIT6;
3683 else
3684 val |= BIT6;
3685 } else {
3686 if (info->serial_signals & SerialSignal_RTS)
3687 val |= BIT2;
3688 else
3689 val &= ~BIT2;
3690 }
3691 write_reg(info, CHA + MODE, val);
3692
3693 if (info->serial_signals & SerialSignal_DTR)
3694 clear_reg_bits(info, CHA + PVR, PVR_DTR);
3695 else
3696 set_reg_bits(info, CHA + PVR, PVR_DTR);
3697 }
3698
rx_reset_buffers(MGSLPC_INFO * info)3699 static void rx_reset_buffers(MGSLPC_INFO *info)
3700 {
3701 RXBUF *buf;
3702 int i;
3703
3704 info->rx_put = 0;
3705 info->rx_get = 0;
3706 info->rx_frame_count = 0;
3707 for (i=0 ; i < info->rx_buf_count ; i++) {
3708 buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
3709 buf->status = buf->count = 0;
3710 }
3711 }
3712
3713 /* Attempt to return a received HDLC frame
3714 * Only frames received without errors are returned.
3715 *
3716 * Returns true if frame returned, otherwise false
3717 */
rx_get_frame(MGSLPC_INFO * info,struct tty_struct * tty)3718 static bool rx_get_frame(MGSLPC_INFO *info, struct tty_struct *tty)
3719 {
3720 unsigned short status;
3721 RXBUF *buf;
3722 unsigned int framesize = 0;
3723 unsigned long flags;
3724 bool return_frame = false;
3725
3726 if (info->rx_frame_count == 0)
3727 return false;
3728
3729 buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
3730
3731 status = buf->status;
3732
3733 /* 07 VFR 1=valid frame
3734 * 06 RDO 1=data overrun
3735 * 05 CRC 1=OK, 0=error
3736 * 04 RAB 1=frame aborted
3737 */
3738 if ((status & 0xf0) != 0xA0) {
3739 if (!(status & BIT7) || (status & BIT4))
3740 info->icount.rxabort++;
3741 else if (status & BIT6)
3742 info->icount.rxover++;
3743 else if (!(status & BIT5)) {
3744 info->icount.rxcrc++;
3745 if (info->params.crc_type & HDLC_CRC_RETURN_EX)
3746 return_frame = true;
3747 }
3748 framesize = 0;
3749 #if SYNCLINK_GENERIC_HDLC
3750 {
3751 info->netdev->stats.rx_errors++;
3752 info->netdev->stats.rx_frame_errors++;
3753 }
3754 #endif
3755 } else
3756 return_frame = true;
3757
3758 if (return_frame)
3759 framesize = buf->count;
3760
3761 if (debug_level >= DEBUG_LEVEL_BH)
3762 printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
3763 __FILE__,__LINE__,info->device_name,status,framesize);
3764
3765 if (debug_level >= DEBUG_LEVEL_DATA)
3766 trace_block(info, buf->data, framesize, 0);
3767
3768 if (framesize) {
3769 if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
3770 framesize+1 > info->max_frame_size) ||
3771 framesize > info->max_frame_size)
3772 info->icount.rxlong++;
3773 else {
3774 if (status & BIT5)
3775 info->icount.rxok++;
3776
3777 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
3778 *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
3779 ++framesize;
3780 }
3781
3782 #if SYNCLINK_GENERIC_HDLC
3783 if (info->netcount)
3784 hdlcdev_rx(info, buf->data, framesize);
3785 else
3786 #endif
3787 ldisc_receive_buf(tty, buf->data, info->flag_buf, framesize);
3788 }
3789 }
3790
3791 spin_lock_irqsave(&info->lock,flags);
3792 buf->status = buf->count = 0;
3793 info->rx_frame_count--;
3794 info->rx_get++;
3795 if (info->rx_get >= info->rx_buf_count)
3796 info->rx_get = 0;
3797 spin_unlock_irqrestore(&info->lock,flags);
3798
3799 return true;
3800 }
3801
register_test(MGSLPC_INFO * info)3802 static bool register_test(MGSLPC_INFO *info)
3803 {
3804 static unsigned char patterns[] =
3805 { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
3806 static unsigned int count = ARRAY_SIZE(patterns);
3807 unsigned int i;
3808 bool rc = true;
3809 unsigned long flags;
3810
3811 spin_lock_irqsave(&info->lock,flags);
3812 reset_device(info);
3813
3814 for (i = 0; i < count; i++) {
3815 write_reg(info, XAD1, patterns[i]);
3816 write_reg(info, XAD2, patterns[(i + 1) % count]);
3817 if ((read_reg(info, XAD1) != patterns[i]) ||
3818 (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
3819 rc = false;
3820 break;
3821 }
3822 }
3823
3824 spin_unlock_irqrestore(&info->lock,flags);
3825 return rc;
3826 }
3827
irq_test(MGSLPC_INFO * info)3828 static bool irq_test(MGSLPC_INFO *info)
3829 {
3830 unsigned long end_time;
3831 unsigned long flags;
3832
3833 spin_lock_irqsave(&info->lock,flags);
3834 reset_device(info);
3835
3836 info->testing_irq = true;
3837 hdlc_mode(info);
3838
3839 info->irq_occurred = false;
3840
3841 /* init hdlc mode */
3842
3843 irq_enable(info, CHA, IRQ_TIMER);
3844 write_reg(info, CHA + TIMR, 0); /* 512 cycles */
3845 issue_command(info, CHA, CMD_START_TIMER);
3846
3847 spin_unlock_irqrestore(&info->lock,flags);
3848
3849 end_time=100;
3850 while(end_time-- && !info->irq_occurred) {
3851 msleep_interruptible(10);
3852 }
3853
3854 info->testing_irq = false;
3855
3856 spin_lock_irqsave(&info->lock,flags);
3857 reset_device(info);
3858 spin_unlock_irqrestore(&info->lock,flags);
3859
3860 return info->irq_occurred;
3861 }
3862
adapter_test(MGSLPC_INFO * info)3863 static int adapter_test(MGSLPC_INFO *info)
3864 {
3865 if (!register_test(info)) {
3866 info->init_error = DiagStatus_AddressFailure;
3867 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
3868 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
3869 return -ENODEV;
3870 }
3871
3872 if (!irq_test(info)) {
3873 info->init_error = DiagStatus_IrqFailure;
3874 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
3875 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
3876 return -ENODEV;
3877 }
3878
3879 if (debug_level >= DEBUG_LEVEL_INFO)
3880 printk("%s(%d):device %s passed diagnostics\n",
3881 __FILE__,__LINE__,info->device_name);
3882 return 0;
3883 }
3884
trace_block(MGSLPC_INFO * info,const char * data,int count,int xmit)3885 static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
3886 {
3887 int i;
3888 int linecount;
3889 if (xmit)
3890 printk("%s tx data:\n",info->device_name);
3891 else
3892 printk("%s rx data:\n",info->device_name);
3893
3894 while(count) {
3895 if (count > 16)
3896 linecount = 16;
3897 else
3898 linecount = count;
3899
3900 for(i=0;i<linecount;i++)
3901 printk("%02X ",(unsigned char)data[i]);
3902 for(;i<17;i++)
3903 printk(" ");
3904 for(i=0;i<linecount;i++) {
3905 if (data[i]>=040 && data[i]<=0176)
3906 printk("%c",data[i]);
3907 else
3908 printk(".");
3909 }
3910 printk("\n");
3911
3912 data += linecount;
3913 count -= linecount;
3914 }
3915 }
3916
3917 /* HDLC frame time out
3918 * update stats and do tx completion processing
3919 */
tx_timeout(unsigned long context)3920 static void tx_timeout(unsigned long context)
3921 {
3922 MGSLPC_INFO *info = (MGSLPC_INFO*)context;
3923 unsigned long flags;
3924
3925 if ( debug_level >= DEBUG_LEVEL_INFO )
3926 printk( "%s(%d):tx_timeout(%s)\n",
3927 __FILE__,__LINE__,info->device_name);
3928 if(info->tx_active &&
3929 info->params.mode == MGSL_MODE_HDLC) {
3930 info->icount.txtimeout++;
3931 }
3932 spin_lock_irqsave(&info->lock,flags);
3933 info->tx_active = false;
3934 info->tx_count = info->tx_put = info->tx_get = 0;
3935
3936 spin_unlock_irqrestore(&info->lock,flags);
3937
3938 #if SYNCLINK_GENERIC_HDLC
3939 if (info->netcount)
3940 hdlcdev_tx_done(info);
3941 else
3942 #endif
3943 {
3944 struct tty_struct *tty = tty_port_tty_get(&info->port);
3945 bh_transmit(info, tty);
3946 tty_kref_put(tty);
3947 }
3948 }
3949
3950 #if SYNCLINK_GENERIC_HDLC
3951
3952 /**
3953 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
3954 * set encoding and frame check sequence (FCS) options
3955 *
3956 * dev pointer to network device structure
3957 * encoding serial encoding setting
3958 * parity FCS setting
3959 *
3960 * returns 0 if success, otherwise error code
3961 */
hdlcdev_attach(struct net_device * dev,unsigned short encoding,unsigned short parity)3962 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
3963 unsigned short parity)
3964 {
3965 MGSLPC_INFO *info = dev_to_port(dev);
3966 struct tty_struct *tty;
3967 unsigned char new_encoding;
3968 unsigned short new_crctype;
3969
3970 /* return error if TTY interface open */
3971 if (info->port.count)
3972 return -EBUSY;
3973
3974 switch (encoding)
3975 {
3976 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
3977 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
3978 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
3979 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
3980 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
3981 default: return -EINVAL;
3982 }
3983
3984 switch (parity)
3985 {
3986 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
3987 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
3988 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
3989 default: return -EINVAL;
3990 }
3991
3992 info->params.encoding = new_encoding;
3993 info->params.crc_type = new_crctype;
3994
3995 /* if network interface up, reprogram hardware */
3996 if (info->netcount) {
3997 tty = tty_port_tty_get(&info->port);
3998 mgslpc_program_hw(info, tty);
3999 tty_kref_put(tty);
4000 }
4001
4002 return 0;
4003 }
4004
4005 /**
4006 * called by generic HDLC layer to send frame
4007 *
4008 * skb socket buffer containing HDLC frame
4009 * dev pointer to network device structure
4010 *
4011 * returns 0 if success, otherwise error code
4012 */
hdlcdev_xmit(struct sk_buff * skb,struct net_device * dev)4013 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
4014 {
4015 MGSLPC_INFO *info = dev_to_port(dev);
4016 unsigned long flags;
4017
4018 if (debug_level >= DEBUG_LEVEL_INFO)
4019 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
4020
4021 /* stop sending until this frame completes */
4022 netif_stop_queue(dev);
4023
4024 /* copy data to device buffers */
4025 skb_copy_from_linear_data(skb, info->tx_buf, skb->len);
4026 info->tx_get = 0;
4027 info->tx_put = info->tx_count = skb->len;
4028
4029 /* update network statistics */
4030 dev->stats.tx_packets++;
4031 dev->stats.tx_bytes += skb->len;
4032
4033 /* done with socket buffer, so free it */
4034 dev_kfree_skb(skb);
4035
4036 /* save start time for transmit timeout detection */
4037 dev->trans_start = jiffies;
4038
4039 /* start hardware transmitter if necessary */
4040 spin_lock_irqsave(&info->lock,flags);
4041 if (!info->tx_active) {
4042 struct tty_struct *tty = tty_port_tty_get(&info->port);
4043 tx_start(info, tty);
4044 tty_kref_put(tty);
4045 }
4046 spin_unlock_irqrestore(&info->lock,flags);
4047
4048 return 0;
4049 }
4050
4051 /**
4052 * called by network layer when interface enabled
4053 * claim resources and initialize hardware
4054 *
4055 * dev pointer to network device structure
4056 *
4057 * returns 0 if success, otherwise error code
4058 */
hdlcdev_open(struct net_device * dev)4059 static int hdlcdev_open(struct net_device *dev)
4060 {
4061 MGSLPC_INFO *info = dev_to_port(dev);
4062 struct tty_struct *tty;
4063 int rc;
4064 unsigned long flags;
4065
4066 if (debug_level >= DEBUG_LEVEL_INFO)
4067 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
4068
4069 /* generic HDLC layer open processing */
4070 if ((rc = hdlc_open(dev)))
4071 return rc;
4072
4073 /* arbitrate between network and tty opens */
4074 spin_lock_irqsave(&info->netlock, flags);
4075 if (info->port.count != 0 || info->netcount != 0) {
4076 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
4077 spin_unlock_irqrestore(&info->netlock, flags);
4078 return -EBUSY;
4079 }
4080 info->netcount=1;
4081 spin_unlock_irqrestore(&info->netlock, flags);
4082
4083 tty = tty_port_tty_get(&info->port);
4084 /* claim resources and init adapter */
4085 if ((rc = startup(info, tty)) != 0) {
4086 tty_kref_put(tty);
4087 spin_lock_irqsave(&info->netlock, flags);
4088 info->netcount=0;
4089 spin_unlock_irqrestore(&info->netlock, flags);
4090 return rc;
4091 }
4092 /* assert DTR and RTS, apply hardware settings */
4093 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
4094 mgslpc_program_hw(info, tty);
4095 tty_kref_put(tty);
4096
4097 /* enable network layer transmit */
4098 dev->trans_start = jiffies;
4099 netif_start_queue(dev);
4100
4101 /* inform generic HDLC layer of current DCD status */
4102 spin_lock_irqsave(&info->lock, flags);
4103 get_signals(info);
4104 spin_unlock_irqrestore(&info->lock, flags);
4105 if (info->serial_signals & SerialSignal_DCD)
4106 netif_carrier_on(dev);
4107 else
4108 netif_carrier_off(dev);
4109 return 0;
4110 }
4111
4112 /**
4113 * called by network layer when interface is disabled
4114 * shutdown hardware and release resources
4115 *
4116 * dev pointer to network device structure
4117 *
4118 * returns 0 if success, otherwise error code
4119 */
hdlcdev_close(struct net_device * dev)4120 static int hdlcdev_close(struct net_device *dev)
4121 {
4122 MGSLPC_INFO *info = dev_to_port(dev);
4123 struct tty_struct *tty = tty_port_tty_get(&info->port);
4124 unsigned long flags;
4125
4126 if (debug_level >= DEBUG_LEVEL_INFO)
4127 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
4128
4129 netif_stop_queue(dev);
4130
4131 /* shutdown adapter and release resources */
4132 shutdown(info, tty);
4133 tty_kref_put(tty);
4134 hdlc_close(dev);
4135
4136 spin_lock_irqsave(&info->netlock, flags);
4137 info->netcount=0;
4138 spin_unlock_irqrestore(&info->netlock, flags);
4139
4140 return 0;
4141 }
4142
4143 /**
4144 * called by network layer to process IOCTL call to network device
4145 *
4146 * dev pointer to network device structure
4147 * ifr pointer to network interface request structure
4148 * cmd IOCTL command code
4149 *
4150 * returns 0 if success, otherwise error code
4151 */
hdlcdev_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)4152 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4153 {
4154 const size_t size = sizeof(sync_serial_settings);
4155 sync_serial_settings new_line;
4156 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
4157 MGSLPC_INFO *info = dev_to_port(dev);
4158 unsigned int flags;
4159
4160 if (debug_level >= DEBUG_LEVEL_INFO)
4161 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
4162
4163 /* return error if TTY interface open */
4164 if (info->port.count)
4165 return -EBUSY;
4166
4167 if (cmd != SIOCWANDEV)
4168 return hdlc_ioctl(dev, ifr, cmd);
4169
4170 switch(ifr->ifr_settings.type) {
4171 case IF_GET_IFACE: /* return current sync_serial_settings */
4172
4173 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
4174 if (ifr->ifr_settings.size < size) {
4175 ifr->ifr_settings.size = size; /* data size wanted */
4176 return -ENOBUFS;
4177 }
4178
4179 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4180 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4181 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4182 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4183
4184 switch (flags){
4185 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
4186 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
4187 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
4188 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
4189 default: new_line.clock_type = CLOCK_DEFAULT;
4190 }
4191
4192 new_line.clock_rate = info->params.clock_speed;
4193 new_line.loopback = info->params.loopback ? 1:0;
4194
4195 if (copy_to_user(line, &new_line, size))
4196 return -EFAULT;
4197 return 0;
4198
4199 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
4200
4201 if(!capable(CAP_NET_ADMIN))
4202 return -EPERM;
4203 if (copy_from_user(&new_line, line, size))
4204 return -EFAULT;
4205
4206 switch (new_line.clock_type)
4207 {
4208 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
4209 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
4210 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
4211 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
4212 case CLOCK_DEFAULT: flags = info->params.flags &
4213 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4214 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4215 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4216 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
4217 default: return -EINVAL;
4218 }
4219
4220 if (new_line.loopback != 0 && new_line.loopback != 1)
4221 return -EINVAL;
4222
4223 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
4224 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
4225 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
4226 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
4227 info->params.flags |= flags;
4228
4229 info->params.loopback = new_line.loopback;
4230
4231 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
4232 info->params.clock_speed = new_line.clock_rate;
4233 else
4234 info->params.clock_speed = 0;
4235
4236 /* if network interface up, reprogram hardware */
4237 if (info->netcount) {
4238 struct tty_struct *tty = tty_port_tty_get(&info->port);
4239 mgslpc_program_hw(info, tty);
4240 tty_kref_put(tty);
4241 }
4242 return 0;
4243
4244 default:
4245 return hdlc_ioctl(dev, ifr, cmd);
4246 }
4247 }
4248
4249 /**
4250 * called by network layer when transmit timeout is detected
4251 *
4252 * dev pointer to network device structure
4253 */
hdlcdev_tx_timeout(struct net_device * dev)4254 static void hdlcdev_tx_timeout(struct net_device *dev)
4255 {
4256 MGSLPC_INFO *info = dev_to_port(dev);
4257 unsigned long flags;
4258
4259 if (debug_level >= DEBUG_LEVEL_INFO)
4260 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
4261
4262 dev->stats.tx_errors++;
4263 dev->stats.tx_aborted_errors++;
4264
4265 spin_lock_irqsave(&info->lock,flags);
4266 tx_stop(info);
4267 spin_unlock_irqrestore(&info->lock,flags);
4268
4269 netif_wake_queue(dev);
4270 }
4271
4272 /**
4273 * called by device driver when transmit completes
4274 * reenable network layer transmit if stopped
4275 *
4276 * info pointer to device instance information
4277 */
hdlcdev_tx_done(MGSLPC_INFO * info)4278 static void hdlcdev_tx_done(MGSLPC_INFO *info)
4279 {
4280 if (netif_queue_stopped(info->netdev))
4281 netif_wake_queue(info->netdev);
4282 }
4283
4284 /**
4285 * called by device driver when frame received
4286 * pass frame to network layer
4287 *
4288 * info pointer to device instance information
4289 * buf pointer to buffer contianing frame data
4290 * size count of data bytes in buf
4291 */
hdlcdev_rx(MGSLPC_INFO * info,char * buf,int size)4292 static void hdlcdev_rx(MGSLPC_INFO *info, char *buf, int size)
4293 {
4294 struct sk_buff *skb = dev_alloc_skb(size);
4295 struct net_device *dev = info->netdev;
4296
4297 if (debug_level >= DEBUG_LEVEL_INFO)
4298 printk("hdlcdev_rx(%s)\n",dev->name);
4299
4300 if (skb == NULL) {
4301 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
4302 dev->stats.rx_dropped++;
4303 return;
4304 }
4305
4306 memcpy(skb_put(skb, size), buf, size);
4307
4308 skb->protocol = hdlc_type_trans(skb, dev);
4309
4310 dev->stats.rx_packets++;
4311 dev->stats.rx_bytes += size;
4312
4313 netif_rx(skb);
4314
4315 dev->last_rx = jiffies;
4316 }
4317
4318 /**
4319 * called by device driver when adding device instance
4320 * do generic HDLC initialization
4321 *
4322 * info pointer to device instance information
4323 *
4324 * returns 0 if success, otherwise error code
4325 */
hdlcdev_init(MGSLPC_INFO * info)4326 static int hdlcdev_init(MGSLPC_INFO *info)
4327 {
4328 int rc;
4329 struct net_device *dev;
4330 hdlc_device *hdlc;
4331
4332 /* allocate and initialize network and HDLC layer objects */
4333
4334 if (!(dev = alloc_hdlcdev(info))) {
4335 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
4336 return -ENOMEM;
4337 }
4338
4339 /* for network layer reporting purposes only */
4340 dev->base_addr = info->io_base;
4341 dev->irq = info->irq_level;
4342
4343 /* network layer callbacks and settings */
4344 dev->do_ioctl = hdlcdev_ioctl;
4345 dev->open = hdlcdev_open;
4346 dev->stop = hdlcdev_close;
4347 dev->tx_timeout = hdlcdev_tx_timeout;
4348 dev->watchdog_timeo = 10*HZ;
4349 dev->tx_queue_len = 50;
4350
4351 /* generic HDLC layer callbacks and settings */
4352 hdlc = dev_to_hdlc(dev);
4353 hdlc->attach = hdlcdev_attach;
4354 hdlc->xmit = hdlcdev_xmit;
4355
4356 /* register objects with HDLC layer */
4357 if ((rc = register_hdlc_device(dev))) {
4358 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
4359 free_netdev(dev);
4360 return rc;
4361 }
4362
4363 info->netdev = dev;
4364 return 0;
4365 }
4366
4367 /**
4368 * called by device driver when removing device instance
4369 * do generic HDLC cleanup
4370 *
4371 * info pointer to device instance information
4372 */
hdlcdev_exit(MGSLPC_INFO * info)4373 static void hdlcdev_exit(MGSLPC_INFO *info)
4374 {
4375 unregister_hdlc_device(info->netdev);
4376 free_netdev(info->netdev);
4377 info->netdev = NULL;
4378 }
4379
4380 #endif /* CONFIG_HDLC */
4381
4382