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Staging: ipack: move out of staging
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / ipack / devices / ipoctal.c
blob783f120338d1d01838b8d82fabe189e3e24ed0f7
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 "../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,
137 struct tty_struct *tty, u8 sr)
138 {
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(tty, 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(tty, 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(tty);
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 struct tty_struct *tty;
212
213 /* If there is no client, skip the check */
214 if (!atomic_read(&channel->open))
215 return;
216
217 tty = tty_port_tty_get(&channel->tty_port);
218 if (!tty)
219 return;
220 /* The HW is organized in pair of channels. See which register we need
221 * to read from */
222 isr = ioread8(&channel->block_regs->r.isr);
223 sr = ioread8(&channel->regs->r.sr);
224
225 /* In case of RS-485, change from TX to RX when finishing TX.
226 * Half-duplex. */
227 if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) &&
228 (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
229 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
230 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
231 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
232 *channel->board_write = 1;
233 wake_up_interruptible(&channel->queue);
234 }
235
236 /* RX data */
237 if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
238 ipoctal_irq_rx(channel, tty, sr);
239
240 /* TX of each character */
241 if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
242 ipoctal_irq_tx(channel);
243
244 tty_flip_buffer_push(tty);
245 tty_kref_put(tty);
246 }
247
248 static irqreturn_t ipoctal_irq_handler(void *arg)
249 {
250 unsigned int i;
251 struct ipoctal *ipoctal = (struct ipoctal *) arg;
252
253 /* Check all channels */
254 for (i = 0; i < NR_CHANNELS; i++)
255 ipoctal_irq_channel(&ipoctal->channel[i]);
256
257 /* Clear the IPack device interrupt */
258 readw(ipoctal->int_space + ACK_INT_REQ0);
259 readw(ipoctal->int_space + ACK_INT_REQ1);
260
261 return IRQ_HANDLED;
262 }
263
264 static const struct tty_port_operations ipoctal_tty_port_ops = {
265 .dtr_rts = NULL,
266 .activate = ipoctal_port_activate,
267 };
268
269 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
270 unsigned int slot)
271 {
272 int res;
273 int i;
274 struct tty_driver *tty;
275 char name[20];
276 struct ipoctal_channel *channel;
277 struct ipack_region *region;
278 void __iomem *addr;
279 union scc2698_channel __iomem *chan_regs;
280 union scc2698_block __iomem *block_regs;
281
282 ipoctal->board_id = ipoctal->dev->id_device;
283
284 region = &ipoctal->dev->region[IPACK_IO_SPACE];
285 addr = devm_ioremap_nocache(&ipoctal->dev->dev,
286 region->start, region->size);
287 if (!addr) {
288 dev_err(&ipoctal->dev->dev,
289 "Unable to map slot [%d:%d] IO space!\n",
290 bus_nr, slot);
291 return -EADDRNOTAVAIL;
292 }
293 /* Save the virtual address to access the registers easily */
294 chan_regs =
295 (union scc2698_channel __iomem *) addr;
296 block_regs =
297 (union scc2698_block __iomem *) addr;
298
299 region = &ipoctal->dev->region[IPACK_INT_SPACE];
300 ipoctal->int_space =
301 devm_ioremap_nocache(&ipoctal->dev->dev,
302 region->start, region->size);
303 if (!ipoctal->int_space) {
304 dev_err(&ipoctal->dev->dev,
305 "Unable to map slot [%d:%d] INT space!\n",
306 bus_nr, slot);
307 return -EADDRNOTAVAIL;
308 }
309
310 region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
311 ipoctal->mem8_space =
312 devm_ioremap_nocache(&ipoctal->dev->dev,
313 region->start, 0x8000);
314 if (!addr) {
315 dev_err(&ipoctal->dev->dev,
316 "Unable to map slot [%d:%d] MEM8 space!\n",
317 bus_nr, slot);
318 return -EADDRNOTAVAIL;
319 }
320
321
322 /* Disable RX and TX before touching anything */
323 for (i = 0; i < NR_CHANNELS ; i++) {
324 struct ipoctal_channel *channel = &ipoctal->channel[i];
325 channel->regs = chan_regs + i;
326 channel->block_regs = block_regs + (i >> 1);
327 channel->board_write = &ipoctal->write;
328 channel->board_id = ipoctal->board_id;
329 if (i & 1) {
330 channel->isr_tx_rdy_mask = ISR_TxRDY_B;
331 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
332 } else {
333 channel->isr_tx_rdy_mask = ISR_TxRDY_A;
334 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
335 }
336
337 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
338 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
339 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
340 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
341 &channel->regs->w.mr); /* mr1 */
342 iowrite8(0, &channel->regs->w.mr); /* mr2 */
343 iowrite8(TX_CLK_9600 | RX_CLK_9600, &channel->regs->w.csr);
344 }
345
346 for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
347 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
348 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
349 &block_regs[i].w.opcr);
350 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
351 IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
352 &block_regs[i].w.imr);
353 }
354
355 /*
356 * IP-OCTAL has different addresses to copy its IRQ vector.
357 * Depending of the carrier these addresses are accesible or not.
358 * More info in the datasheet.
359 */
360 ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
361 ipoctal_irq_handler, ipoctal);
362 /* Dummy write */
363 iowrite8(1, ipoctal->mem8_space + 1);
364
365 /* Register the TTY device */
366
367 /* Each IP-OCTAL channel is a TTY port */
368 tty = alloc_tty_driver(NR_CHANNELS);
369
370 if (!tty)
371 return -ENOMEM;
372
373 /* Fill struct tty_driver with ipoctal data */
374 tty->owner = THIS_MODULE;
375 tty->driver_name = KBUILD_MODNAME;
376 sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
377 tty->name = name;
378 tty->major = 0;
379
380 tty->minor_start = 0;
381 tty->type = TTY_DRIVER_TYPE_SERIAL;
382 tty->subtype = SERIAL_TYPE_NORMAL;
383 tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
384 tty->init_termios = tty_std_termios;
385 tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
386 tty->init_termios.c_ispeed = 9600;
387 tty->init_termios.c_ospeed = 9600;
388
389 tty_set_operations(tty, &ipoctal_fops);
390 res = tty_register_driver(tty);
391 if (res) {
392 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
393 put_tty_driver(tty);
394 return res;
395 }
396
397 /* Save struct tty_driver for use it when uninstalling the device */
398 ipoctal->tty_drv = tty;
399
400 for (i = 0; i < NR_CHANNELS; i++) {
401 struct device *tty_dev;
402
403 channel = &ipoctal->channel[i];
404 tty_port_init(&channel->tty_port);
405 tty_port_alloc_xmit_buf(&channel->tty_port);
406 channel->tty_port.ops = &ipoctal_tty_port_ops;
407
408 ipoctal_reset_stats(&channel->stats);
409 channel->nb_bytes = 0;
410 init_waitqueue_head(&channel->queue);
411
412 spin_lock_init(&channel->lock);
413 channel->pointer_read = 0;
414 channel->pointer_write = 0;
415 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
416 if (IS_ERR(tty_dev)) {
417 dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
418 continue;
419 }
420 dev_set_drvdata(tty_dev, channel);
421
422 /*
423 * Enable again the RX. TX will be enabled when
424 * there is something to send
425 */
426 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
427 }
428
429 return 0;
430 }
431
432 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
433 const unsigned char *buf,
434 int count)
435 {
436 unsigned long flags;
437 int i;
438 unsigned int *pointer_read = &channel->pointer_read;
439
440 /* Copy the bytes from the user buffer to the internal one */
441 for (i = 0; i < count; i++) {
442 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
443 spin_lock_irqsave(&channel->lock, flags);
444 channel->tty_port.xmit_buf[*pointer_read] = buf[i];
445 *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
446 channel->nb_bytes++;
447 spin_unlock_irqrestore(&channel->lock, flags);
448 } else {
449 break;
450 }
451 }
452 return i;
453 }
454
455 static int ipoctal_write_tty(struct tty_struct *tty,
456 const unsigned char *buf, int count)
457 {
458 struct ipoctal_channel *channel = tty->driver_data;
459 unsigned int char_copied;
460
461 char_copied = ipoctal_copy_write_buffer(channel, buf, count);
462
463 /* As the IP-OCTAL 485 only supports half duplex, do it manually */
464 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
465 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
466 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
467 }
468
469 /*
470 * Send a packet and then disable TX to avoid failure after several send
471 * operations
472 */
473 iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
474 wait_event_interruptible(channel->queue, *channel->board_write);
475 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
476
477 *channel->board_write = 0;
478 return char_copied;
479 }
480
481 static int ipoctal_write_room(struct tty_struct *tty)
482 {
483 struct ipoctal_channel *channel = tty->driver_data;
484
485 return PAGE_SIZE - channel->nb_bytes;
486 }
487
488 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
489 {
490 struct ipoctal_channel *channel = tty->driver_data;
491
492 return channel->nb_bytes;
493 }
494
495 static void ipoctal_set_termios(struct tty_struct *tty,
496 struct ktermios *old_termios)
497 {
498 unsigned int cflag;
499 unsigned char mr1 = 0;
500 unsigned char mr2 = 0;
501 unsigned char csr = 0;
502 struct ipoctal_channel *channel = tty->driver_data;
503 speed_t baud;
504
505 cflag = tty->termios.c_cflag;
506
507 /* Disable and reset everything before change the setup */
508 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
509 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
510 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
511 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
512 iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
513
514 /* Set Bits per chars */
515 switch (cflag & CSIZE) {
516 case CS6:
517 mr1 |= MR1_CHRL_6_BITS;
518 break;
519 case CS7:
520 mr1 |= MR1_CHRL_7_BITS;
521 break;
522 case CS8:
523 default:
524 mr1 |= MR1_CHRL_8_BITS;
525 /* By default, select CS8 */
526 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
527 break;
528 }
529
530 /* Set Parity */
531 if (cflag & PARENB)
532 if (cflag & PARODD)
533 mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
534 else
535 mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
536 else
537 mr1 |= MR1_PARITY_OFF;
538
539 /* Mark or space parity is not supported */
540 tty->termios.c_cflag &= ~CMSPAR;
541
542 /* Set stop bits */
543 if (cflag & CSTOPB)
544 mr2 |= MR2_STOP_BITS_LENGTH_2;
545 else
546 mr2 |= MR2_STOP_BITS_LENGTH_1;
547
548 /* Set the flow control */
549 switch (channel->board_id) {
550 case IPACK1_DEVICE_ID_SBS_OCTAL_232:
551 if (cflag & CRTSCTS) {
552 mr1 |= MR1_RxRTS_CONTROL_ON;
553 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
554 } else {
555 mr1 |= MR1_RxRTS_CONTROL_OFF;
556 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
557 }
558 break;
559 case IPACK1_DEVICE_ID_SBS_OCTAL_422:
560 mr1 |= MR1_RxRTS_CONTROL_OFF;
561 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
562 break;
563 case IPACK1_DEVICE_ID_SBS_OCTAL_485:
564 mr1 |= MR1_RxRTS_CONTROL_OFF;
565 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
566 break;
567 default:
568 return;
569 break;
570 }
571
572 baud = tty_get_baud_rate(tty);
573 tty_termios_encode_baud_rate(&tty->termios, baud, baud);
574
575 /* Set baud rate */
576 switch (baud) {
577 case 75:
578 csr |= TX_CLK_75 | RX_CLK_75;
579 break;
580 case 110:
581 csr |= TX_CLK_110 | RX_CLK_110;
582 break;
583 case 150:
584 csr |= TX_CLK_150 | RX_CLK_150;
585 break;
586 case 300:
587 csr |= TX_CLK_300 | RX_CLK_300;
588 break;
589 case 600:
590 csr |= TX_CLK_600 | RX_CLK_600;
591 break;
592 case 1200:
593 csr |= TX_CLK_1200 | RX_CLK_1200;
594 break;
595 case 1800:
596 csr |= TX_CLK_1800 | RX_CLK_1800;
597 break;
598 case 2000:
599 csr |= TX_CLK_2000 | RX_CLK_2000;
600 break;
601 case 2400:
602 csr |= TX_CLK_2400 | RX_CLK_2400;
603 break;
604 case 4800:
605 csr |= TX_CLK_4800 | RX_CLK_4800;
606 break;
607 case 9600:
608 csr |= TX_CLK_9600 | RX_CLK_9600;
609 break;
610 case 19200:
611 csr |= TX_CLK_19200 | RX_CLK_19200;
612 break;
613 case 38400:
614 default:
615 csr |= TX_CLK_38400 | RX_CLK_38400;
616 /* In case of default, we establish 38400 bps */
617 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
618 break;
619 }
620
621 mr1 |= MR1_ERROR_CHAR;
622 mr1 |= MR1_RxINT_RxRDY;
623
624 /* Write the control registers */
625 iowrite8(mr1, &channel->regs->w.mr);
626 iowrite8(mr2, &channel->regs->w.mr);
627 iowrite8(csr, &channel->regs->w.csr);
628
629 /* Enable again the RX */
630 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
631 }
632
633 static void ipoctal_hangup(struct tty_struct *tty)
634 {
635 unsigned long flags;
636 struct ipoctal_channel *channel = tty->driver_data;
637
638 if (channel == NULL)
639 return;
640
641 spin_lock_irqsave(&channel->lock, flags);
642 channel->nb_bytes = 0;
643 channel->pointer_read = 0;
644 channel->pointer_write = 0;
645 spin_unlock_irqrestore(&channel->lock, flags);
646
647 tty_port_hangup(&channel->tty_port);
648
649 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
650 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
651 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
652 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
653 iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
654
655 clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
656 wake_up_interruptible(&channel->tty_port.open_wait);
657 }
658
659 static const struct tty_operations ipoctal_fops = {
660 .ioctl = NULL,
661 .open = ipoctal_open,
662 .close = ipoctal_close,
663 .write = ipoctal_write_tty,
664 .set_termios = ipoctal_set_termios,
665 .write_room = ipoctal_write_room,
666 .chars_in_buffer = ipoctal_chars_in_buffer,
667 .get_icount = ipoctal_get_icount,
668 .hangup = ipoctal_hangup,
669 };
670
671 static int ipoctal_probe(struct ipack_device *dev)
672 {
673 int res;
674 struct ipoctal *ipoctal;
675
676 ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
677 if (ipoctal == NULL)
678 return -ENOMEM;
679
680 ipoctal->dev = dev;
681 res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
682 if (res)
683 goto out_uninst;
684
685 dev_set_drvdata(&dev->dev, ipoctal);
686 return 0;
687
688 out_uninst:
689 kfree(ipoctal);
690 return res;
691 }
692
693 static void __ipoctal_remove(struct ipoctal *ipoctal)
694 {
695 int i;
696
697 ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
698
699 for (i = 0; i < NR_CHANNELS; i++) {
700 struct ipoctal_channel *channel = &ipoctal->channel[i];
701 tty_unregister_device(ipoctal->tty_drv, i);
702 tty_port_free_xmit_buf(&channel->tty_port);
703 }
704
705 tty_unregister_driver(ipoctal->tty_drv);
706 put_tty_driver(ipoctal->tty_drv);
707 kfree(ipoctal);
708 }
709
710 static void ipoctal_remove(struct ipack_device *idev)
711 {
712 __ipoctal_remove(dev_get_drvdata(&idev->dev));
713 }
714
715 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
716 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
717 IPACK1_DEVICE_ID_SBS_OCTAL_232) },
718 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
719 IPACK1_DEVICE_ID_SBS_OCTAL_422) },
720 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
721 IPACK1_DEVICE_ID_SBS_OCTAL_485) },
722 { 0, },
723 };
724
725 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
726
727 static const struct ipack_driver_ops ipoctal_drv_ops = {
728 .probe = ipoctal_probe,
729 .remove = ipoctal_remove,
730 };
731
732 static struct ipack_driver driver = {
733 .ops = &ipoctal_drv_ops,
734 .id_table = ipoctal_ids,
735 };
736
737 static int __init ipoctal_init(void)
738 {
739 return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
740 }
741
742 static void __exit ipoctal_exit(void)
743 {
744 ipack_driver_unregister(&driver);
745 }
746
747 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
748 MODULE_LICENSE("GPL");
749
750 module_init(ipoctal_init);
751 module_exit(ipoctal_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree