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