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