Merge tag 'tty-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
[~shefty/rdma-dev.git] / drivers / ipack / devices / ipoctal.c
1 /**
2  * ipoctal.c
3  *
4  * driver for the GE IP-OCTAL boards
5  *
6  * Copyright (C) 2009-2012 CERN (www.cern.ch)
7  * Author: Nicolas Serafini, EIC2 SA
8  * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
9  *
10  * This program is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU General Public License as published by the Free
12  * Software Foundation; version 2 of the License.
13  */
14
15 #include <linux/device.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/sched.h>
19 #include <linux/tty.h>
20 #include <linux/serial.h>
21 #include <linux/tty_flip.h>
22 #include <linux/slab.h>
23 #include <linux/atomic.h>
24 #include <linux/io.h>
25 #include <linux/ipack.h>
26 #include "ipoctal.h"
27 #include "scc2698.h"
28
29 #define IP_OCTAL_ID_SPACE_VECTOR    0x41
30 #define IP_OCTAL_NB_BLOCKS          4
31
32 static const struct tty_operations ipoctal_fops;
33
34 struct ipoctal_channel {
35         struct ipoctal_stats            stats;
36         unsigned int                    nb_bytes;
37         wait_queue_head_t               queue;
38         spinlock_t                      lock;
39         unsigned int                    pointer_read;
40         unsigned int                    pointer_write;
41         atomic_t                        open;
42         struct tty_port                 tty_port;
43         union scc2698_channel __iomem   *regs;
44         union scc2698_block __iomem     *block_regs;
45         unsigned int                    board_id;
46         unsigned char                   *board_write;
47         u8                              isr_rx_rdy_mask;
48         u8                              isr_tx_rdy_mask;
49 };
50
51 struct ipoctal {
52         struct ipack_device             *dev;
53         unsigned int                    board_id;
54         struct ipoctal_channel          channel[NR_CHANNELS];
55         unsigned char                   write;
56         struct tty_driver               *tty_drv;
57         u8 __iomem                      *mem8_space;
58         u8 __iomem                      *int_space;
59 };
60
61 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
62 {
63         struct ipoctal_channel *channel;
64
65         channel = dev_get_drvdata(tty->dev);
66
67         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
68         return 0;
69 }
70
71 static int ipoctal_open(struct tty_struct *tty, struct file *file)
72 {
73         int res;
74         struct ipoctal_channel *channel;
75
76         channel = dev_get_drvdata(tty->dev);
77
78         if (atomic_read(&channel->open))
79                 return -EBUSY;
80
81         tty->driver_data = channel;
82
83         res = tty_port_open(&channel->tty_port, tty, file);
84         if (res)
85                 return res;
86
87         atomic_inc(&channel->open);
88         return 0;
89 }
90
91 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
92 {
93         stats->tx = 0;
94         stats->rx = 0;
95         stats->rcv_break = 0;
96         stats->framing_err = 0;
97         stats->overrun_err = 0;
98         stats->parity_err = 0;
99 }
100
101 static void ipoctal_free_channel(struct ipoctal_channel *channel)
102 {
103         ipoctal_reset_stats(&channel->stats);
104         channel->pointer_read = 0;
105         channel->pointer_write = 0;
106         channel->nb_bytes = 0;
107 }
108
109 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
110 {
111         struct ipoctal_channel *channel = tty->driver_data;
112
113         tty_port_close(&channel->tty_port, tty, filp);
114
115         if (atomic_dec_and_test(&channel->open))
116                 ipoctal_free_channel(channel);
117 }
118
119 static int ipoctal_get_icount(struct tty_struct *tty,
120                               struct serial_icounter_struct *icount)
121 {
122         struct ipoctal_channel *channel = tty->driver_data;
123
124         icount->cts = 0;
125         icount->dsr = 0;
126         icount->rng = 0;
127         icount->dcd = 0;
128         icount->rx = channel->stats.rx;
129         icount->tx = channel->stats.tx;
130         icount->frame = channel->stats.framing_err;
131         icount->parity = channel->stats.parity_err;
132         icount->brk = channel->stats.rcv_break;
133         return 0;
134 }
135
136 static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr)
137 {
138         struct tty_port *port = &channel->tty_port;
139         unsigned char value;
140         unsigned char flag = TTY_NORMAL;
141         u8 isr;
142
143         do {
144                 value = ioread8(&channel->regs->r.rhr);
145                 /* Error: count statistics */
146                 if (sr & SR_ERROR) {
147                         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
148
149                         if (sr & SR_OVERRUN_ERROR) {
150                                 channel->stats.overrun_err++;
151                                 /* Overrun doesn't affect the current character*/
152                                 tty_insert_flip_char(port, 0, TTY_OVERRUN);
153                         }
154                         if (sr & SR_PARITY_ERROR) {
155                                 channel->stats.parity_err++;
156                                 flag = TTY_PARITY;
157                         }
158                         if (sr & SR_FRAMING_ERROR) {
159                                 channel->stats.framing_err++;
160                                 flag = TTY_FRAME;
161                         }
162                         if (sr & SR_RECEIVED_BREAK) {
163                                 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
164                                 channel->stats.rcv_break++;
165                                 flag = TTY_BREAK;
166                         }
167                 }
168                 tty_insert_flip_char(port, value, flag);
169
170                 /* Check if there are more characters in RX FIFO
171                  * If there are more, the isr register for this channel
172                  * has enabled the RxRDY|FFULL bit.
173                  */
174                 isr = ioread8(&channel->block_regs->r.isr);
175                 sr = ioread8(&channel->regs->r.sr);
176         } while (isr & channel->isr_rx_rdy_mask);
177
178         tty_flip_buffer_push(port);
179 }
180
181 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
182 {
183         unsigned char value;
184         unsigned int *pointer_write = &channel->pointer_write;
185
186         if (channel->nb_bytes <= 0) {
187                 channel->nb_bytes = 0;
188                 return;
189         }
190
191         value = channel->tty_port.xmit_buf[*pointer_write];
192         iowrite8(value, &channel->regs->w.thr);
193         channel->stats.tx++;
194         (*pointer_write)++;
195         *pointer_write = *pointer_write % PAGE_SIZE;
196         channel->nb_bytes--;
197
198         if ((channel->nb_bytes == 0) &&
199             (waitqueue_active(&channel->queue))) {
200
201                 if (channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
202                         *channel->board_write = 1;
203                         wake_up_interruptible(&channel->queue);
204                 }
205         }
206 }
207
208 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
209 {
210         u8 isr, sr;
211
212         /* If there is no client, skip the check */
213         if (!atomic_read(&channel->open))
214                 return;
215
216         /* The HW is organized in pair of channels.  See which register we need
217          * to read from */
218         isr = ioread8(&channel->block_regs->r.isr);
219         sr = ioread8(&channel->regs->r.sr);
220
221         /* In case of RS-485, change from TX to RX when finishing TX.
222          * Half-duplex. */
223         if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) &&
224             (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
225                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
226                 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
227                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
228                 *channel->board_write = 1;
229                 wake_up_interruptible(&channel->queue);
230         }
231
232         /* RX data */
233         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
234                 ipoctal_irq_rx(channel, sr);
235
236         /* TX of each character */
237         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
238                 ipoctal_irq_tx(channel);
239
240         tty_flip_buffer_push(&channel->tty_port);
241 }
242
243 static irqreturn_t ipoctal_irq_handler(void *arg)
244 {
245         unsigned int i;
246         struct ipoctal *ipoctal = (struct ipoctal *) arg;
247
248         /* Check all channels */
249         for (i = 0; i < NR_CHANNELS; i++)
250                 ipoctal_irq_channel(&ipoctal->channel[i]);
251
252         /* Clear the IPack device interrupt */
253         readw(ipoctal->int_space + ACK_INT_REQ0);
254         readw(ipoctal->int_space + ACK_INT_REQ1);
255
256         return IRQ_HANDLED;
257 }
258
259 static const struct tty_port_operations ipoctal_tty_port_ops = {
260         .dtr_rts = NULL,
261         .activate = ipoctal_port_activate,
262 };
263
264 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
265                              unsigned int slot)
266 {
267         int res;
268         int i;
269         struct tty_driver *tty;
270         char name[20];
271         struct ipoctal_channel *channel;
272         struct ipack_region *region;
273         void __iomem *addr;
274         union scc2698_channel __iomem *chan_regs;
275         union scc2698_block __iomem *block_regs;
276
277         ipoctal->board_id = ipoctal->dev->id_device;
278
279         region = &ipoctal->dev->region[IPACK_IO_SPACE];
280         addr = devm_ioremap_nocache(&ipoctal->dev->dev,
281                                     region->start, region->size);
282         if (!addr) {
283                 dev_err(&ipoctal->dev->dev,
284                         "Unable to map slot [%d:%d] IO space!\n",
285                         bus_nr, slot);
286                 return -EADDRNOTAVAIL;
287         }
288         /* Save the virtual address to access the registers easily */
289         chan_regs =
290                 (union scc2698_channel __iomem *) addr;
291         block_regs =
292                 (union scc2698_block __iomem *) addr;
293
294         region = &ipoctal->dev->region[IPACK_INT_SPACE];
295         ipoctal->int_space =
296                 devm_ioremap_nocache(&ipoctal->dev->dev,
297                                      region->start, region->size);
298         if (!ipoctal->int_space) {
299                 dev_err(&ipoctal->dev->dev,
300                         "Unable to map slot [%d:%d] INT space!\n",
301                         bus_nr, slot);
302                 return -EADDRNOTAVAIL;
303         }
304
305         region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
306         ipoctal->mem8_space =
307                 devm_ioremap_nocache(&ipoctal->dev->dev,
308                                      region->start, 0x8000);
309         if (!addr) {
310                 dev_err(&ipoctal->dev->dev,
311                         "Unable to map slot [%d:%d] MEM8 space!\n",
312                         bus_nr, slot);
313                 return -EADDRNOTAVAIL;
314         }
315
316
317         /* Disable RX and TX before touching anything */
318         for (i = 0; i < NR_CHANNELS ; i++) {
319                 struct ipoctal_channel *channel = &ipoctal->channel[i];
320                 channel->regs = chan_regs + i;
321                 channel->block_regs = block_regs + (i >> 1);
322                 channel->board_write = &ipoctal->write;
323                 channel->board_id = ipoctal->board_id;
324                 if (i & 1) {
325                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
326                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
327                 } else {
328                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
329                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
330                 }
331
332                 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
333                 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
334                 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
335                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
336                          &channel->regs->w.mr); /* mr1 */
337                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
338                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
339         }
340
341         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
342                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
343                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
344                          &block_regs[i].w.opcr);
345                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
346                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
347                          &block_regs[i].w.imr);
348         }
349
350         /*
351          * IP-OCTAL has different addresses to copy its IRQ vector.
352          * Depending of the carrier these addresses are accesible or not.
353          * More info in the datasheet.
354          */
355         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
356                                        ipoctal_irq_handler, ipoctal);
357         /* Dummy write */
358         iowrite8(1, ipoctal->mem8_space + 1);
359
360         /* Register the TTY device */
361
362         /* Each IP-OCTAL channel is a TTY port */
363         tty = alloc_tty_driver(NR_CHANNELS);
364
365         if (!tty)
366                 return -ENOMEM;
367
368         /* Fill struct tty_driver with ipoctal data */
369         tty->owner = THIS_MODULE;
370         tty->driver_name = KBUILD_MODNAME;
371         sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
372         tty->name = name;
373         tty->major = 0;
374
375         tty->minor_start = 0;
376         tty->type = TTY_DRIVER_TYPE_SERIAL;
377         tty->subtype = SERIAL_TYPE_NORMAL;
378         tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
379         tty->init_termios = tty_std_termios;
380         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
381         tty->init_termios.c_ispeed = 9600;
382         tty->init_termios.c_ospeed = 9600;
383
384         tty_set_operations(tty, &ipoctal_fops);
385         res = tty_register_driver(tty);
386         if (res) {
387                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
388                 put_tty_driver(tty);
389                 return res;
390         }
391
392         /* Save struct tty_driver for use it when uninstalling the device */
393         ipoctal->tty_drv = tty;
394
395         for (i = 0; i < NR_CHANNELS; i++) {
396                 struct device *tty_dev;
397
398                 channel = &ipoctal->channel[i];
399                 tty_port_init(&channel->tty_port);
400                 tty_port_alloc_xmit_buf(&channel->tty_port);
401                 channel->tty_port.ops = &ipoctal_tty_port_ops;
402
403                 ipoctal_reset_stats(&channel->stats);
404                 channel->nb_bytes = 0;
405                 init_waitqueue_head(&channel->queue);
406
407                 spin_lock_init(&channel->lock);
408                 channel->pointer_read = 0;
409                 channel->pointer_write = 0;
410                 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
411                 if (IS_ERR(tty_dev)) {
412                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
413                         tty_port_destroy(&channel->tty_port);
414                         continue;
415                 }
416                 dev_set_drvdata(tty_dev, channel);
417
418                 /*
419                  * Enable again the RX. TX will be enabled when
420                  * there is something to send
421                  */
422                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
423         }
424
425         return 0;
426 }
427
428 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
429                                             const unsigned char *buf,
430                                             int count)
431 {
432         unsigned long flags;
433         int i;
434         unsigned int *pointer_read = &channel->pointer_read;
435
436         /* Copy the bytes from the user buffer to the internal one */
437         for (i = 0; i < count; i++) {
438                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
439                         spin_lock_irqsave(&channel->lock, flags);
440                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
441                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
442                         channel->nb_bytes++;
443                         spin_unlock_irqrestore(&channel->lock, flags);
444                 } else {
445                         break;
446                 }
447         }
448         return i;
449 }
450
451 static int ipoctal_write_tty(struct tty_struct *tty,
452                              const unsigned char *buf, int count)
453 {
454         struct ipoctal_channel *channel = tty->driver_data;
455         unsigned int char_copied;
456
457         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
458
459         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
460         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
461                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
462                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
463         }
464
465         /*
466          * Send a packet and then disable TX to avoid failure after several send
467          * operations
468          */
469         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
470         wait_event_interruptible(channel->queue, *channel->board_write);
471         iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
472
473         *channel->board_write = 0;
474         return char_copied;
475 }
476
477 static int ipoctal_write_room(struct tty_struct *tty)
478 {
479         struct ipoctal_channel *channel = tty->driver_data;
480
481         return PAGE_SIZE - channel->nb_bytes;
482 }
483
484 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
485 {
486         struct ipoctal_channel *channel = tty->driver_data;
487
488         return channel->nb_bytes;
489 }
490
491 static void ipoctal_set_termios(struct tty_struct *tty,
492                                 struct ktermios *old_termios)
493 {
494         unsigned int cflag;
495         unsigned char mr1 = 0;
496         unsigned char mr2 = 0;
497         unsigned char csr = 0;
498         struct ipoctal_channel *channel = tty->driver_data;
499         speed_t baud;
500
501         cflag = tty->termios.c_cflag;
502
503         /* Disable and reset everything before change the setup */
504         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
505         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
506         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
507         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
508         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
509
510         /* Set Bits per chars */
511         switch (cflag & CSIZE) {
512         case CS6:
513                 mr1 |= MR1_CHRL_6_BITS;
514                 break;
515         case CS7:
516                 mr1 |= MR1_CHRL_7_BITS;
517                 break;
518         case CS8:
519         default:
520                 mr1 |= MR1_CHRL_8_BITS;
521                 /* By default, select CS8 */
522                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
523                 break;
524         }
525
526         /* Set Parity */
527         if (cflag & PARENB)
528                 if (cflag & PARODD)
529                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
530                 else
531                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
532         else
533                 mr1 |= MR1_PARITY_OFF;
534
535         /* Mark or space parity is not supported */
536         tty->termios.c_cflag &= ~CMSPAR;
537
538         /* Set stop bits */
539         if (cflag & CSTOPB)
540                 mr2 |= MR2_STOP_BITS_LENGTH_2;
541         else
542                 mr2 |= MR2_STOP_BITS_LENGTH_1;
543
544         /* Set the flow control */
545         switch (channel->board_id) {
546         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
547                 if (cflag & CRTSCTS) {
548                         mr1 |= MR1_RxRTS_CONTROL_ON;
549                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
550                 } else {
551                         mr1 |= MR1_RxRTS_CONTROL_OFF;
552                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
553                 }
554                 break;
555         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
556                 mr1 |= MR1_RxRTS_CONTROL_OFF;
557                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
558                 break;
559         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
560                 mr1 |= MR1_RxRTS_CONTROL_OFF;
561                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
562                 break;
563         default:
564                 return;
565                 break;
566         }
567
568         baud = tty_get_baud_rate(tty);
569         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
570
571         /* Set baud rate */
572         switch (baud) {
573         case 75:
574                 csr |= TX_CLK_75 | RX_CLK_75;
575                 break;
576         case 110:
577                 csr |= TX_CLK_110 | RX_CLK_110;
578                 break;
579         case 150:
580                 csr |= TX_CLK_150 | RX_CLK_150;
581                 break;
582         case 300:
583                 csr |= TX_CLK_300 | RX_CLK_300;
584                 break;
585         case 600:
586                 csr |= TX_CLK_600 | RX_CLK_600;
587                 break;
588         case 1200:
589                 csr |= TX_CLK_1200 | RX_CLK_1200;
590                 break;
591         case 1800:
592                 csr |= TX_CLK_1800 | RX_CLK_1800;
593                 break;
594         case 2000:
595                 csr |= TX_CLK_2000 | RX_CLK_2000;
596                 break;
597         case 2400:
598                 csr |= TX_CLK_2400 | RX_CLK_2400;
599                 break;
600         case 4800:
601                 csr |= TX_CLK_4800  | RX_CLK_4800;
602                 break;
603         case 9600:
604                 csr |= TX_CLK_9600  | RX_CLK_9600;
605                 break;
606         case 19200:
607                 csr |= TX_CLK_19200 | RX_CLK_19200;
608                 break;
609         case 38400:
610         default:
611                 csr |= TX_CLK_38400 | RX_CLK_38400;
612                 /* In case of default, we establish 38400 bps */
613                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
614                 break;
615         }
616
617         mr1 |= MR1_ERROR_CHAR;
618         mr1 |= MR1_RxINT_RxRDY;
619
620         /* Write the control registers */
621         iowrite8(mr1, &channel->regs->w.mr);
622         iowrite8(mr2, &channel->regs->w.mr);
623         iowrite8(csr, &channel->regs->w.csr);
624
625         /* Enable again the RX */
626         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
627 }
628
629 static void ipoctal_hangup(struct tty_struct *tty)
630 {
631         unsigned long flags;
632         struct ipoctal_channel *channel = tty->driver_data;
633
634         if (channel == NULL)
635                 return;
636
637         spin_lock_irqsave(&channel->lock, flags);
638         channel->nb_bytes = 0;
639         channel->pointer_read = 0;
640         channel->pointer_write = 0;
641         spin_unlock_irqrestore(&channel->lock, flags);
642
643         tty_port_hangup(&channel->tty_port);
644
645         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
646         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
647         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
648         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
649         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
650
651         clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
652         wake_up_interruptible(&channel->tty_port.open_wait);
653 }
654
655 static const struct tty_operations ipoctal_fops = {
656         .ioctl =                NULL,
657         .open =                 ipoctal_open,
658         .close =                ipoctal_close,
659         .write =                ipoctal_write_tty,
660         .set_termios =          ipoctal_set_termios,
661         .write_room =           ipoctal_write_room,
662         .chars_in_buffer =      ipoctal_chars_in_buffer,
663         .get_icount =           ipoctal_get_icount,
664         .hangup =               ipoctal_hangup,
665 };
666
667 static int ipoctal_probe(struct ipack_device *dev)
668 {
669         int res;
670         struct ipoctal *ipoctal;
671
672         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
673         if (ipoctal == NULL)
674                 return -ENOMEM;
675
676         ipoctal->dev = dev;
677         res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
678         if (res)
679                 goto out_uninst;
680
681         dev_set_drvdata(&dev->dev, ipoctal);
682         return 0;
683
684 out_uninst:
685         kfree(ipoctal);
686         return res;
687 }
688
689 static void __ipoctal_remove(struct ipoctal *ipoctal)
690 {
691         int i;
692
693         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
694
695         for (i = 0; i < NR_CHANNELS; i++) {
696                 struct ipoctal_channel *channel = &ipoctal->channel[i];
697                 tty_unregister_device(ipoctal->tty_drv, i);
698                 tty_port_free_xmit_buf(&channel->tty_port);
699                 tty_port_destroy(&channel->tty_port);
700         }
701
702         tty_unregister_driver(ipoctal->tty_drv);
703         put_tty_driver(ipoctal->tty_drv);
704         kfree(ipoctal);
705 }
706
707 static void ipoctal_remove(struct ipack_device *idev)
708 {
709         __ipoctal_remove(dev_get_drvdata(&idev->dev));
710 }
711
712 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
713         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
714                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
715         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
716                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
717         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
718                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
719         { 0, },
720 };
721
722 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
723
724 static const struct ipack_driver_ops ipoctal_drv_ops = {
725         .probe  = ipoctal_probe,
726         .remove = ipoctal_remove,
727 };
728
729 static struct ipack_driver driver = {
730         .ops      = &ipoctal_drv_ops,
731         .id_table = ipoctal_ids,
732 };
733
734 static int __init ipoctal_init(void)
735 {
736         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
737 }
738
739 static void __exit ipoctal_exit(void)
740 {
741         ipack_driver_unregister(&driver);
742 }
743
744 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
745 MODULE_LICENSE("GPL");
746
747 module_init(ipoctal_init);
748 module_exit(ipoctal_exit);