1/*
2 * PCMCIA 16-bit resource management functions
3 *
4 * The initial developer of the original code is David A. Hinds
5 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
6 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
7 *
8 * Copyright (C) 1999 David A. Hinds
9 * Copyright (C) 2004-2010 Dominik Brodowski
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 */
16
17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/interrupt.h>
20#include <linux/delay.h>
21#include <linux/pci.h>
22#include <linux/device.h>
23#include <linux/netdevice.h>
24#include <linux/slab.h>
25
26#include <asm/irq.h>
27
28#include <pcmcia/ss.h>
29#include <pcmcia/cistpl.h>
30#include <pcmcia/cisreg.h>
31#include <pcmcia/ds.h>
32
33#include "cs_internal.h"
34
35
36/* Access speed for IO windows */
37static int io_speed;
38module_param(io_speed, int, 0444);
39
40
41int pcmcia_validate_mem(struct pcmcia_socket *s)
42{
43 if (s->resource_ops->validate_mem)
44 return s->resource_ops->validate_mem(s);
45 /* if there is no callback, we can assume that everything is OK */
46 return 0;
47}
48
49struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
50 int low, struct pcmcia_socket *s)
51{
52 if (s->resource_ops->find_mem)
53 return s->resource_ops->find_mem(base, num, align, low, s);
54 return NULL;
55}
56
57
58/**
59 * release_io_space() - release IO ports allocated with alloc_io_space()
60 * @s: pcmcia socket
61 * @res: resource to release
62 *
63 */
64static void release_io_space(struct pcmcia_socket *s, struct resource *res)
65{
66 resource_size_t num = resource_size(res);
67 int i;
68
69 dev_dbg(&s->dev, "release_io_space for %pR\n", res);
70
71 for (i = 0; i < MAX_IO_WIN; i++) {
72 if (!s->io[i].res)
73 continue;
74 if ((s->io[i].res->start <= res->start) &&
75 (s->io[i].res->end >= res->end)) {
76 s->io[i].InUse -= num;
77 if (res->parent)
78 release_resource(res);
79 res->start = res->end = 0;
80 res->flags = IORESOURCE_IO;
81 /* Free the window if no one else is using it */
82 if (s->io[i].InUse == 0) {
83 release_resource(s->io[i].res);
84 kfree(s->io[i].res);
85 s->io[i].res = NULL;
86 }
87 }
88 }
89}
90
91
92/**
93 * alloc_io_space() - allocate IO ports for use by a PCMCIA device
94 * @s: pcmcia socket
95 * @res: resource to allocate (begin: begin, end: size)
96 * @lines: number of IO lines decoded by the PCMCIA card
97 *
98 * Special stuff for managing IO windows, because they are scarce
99 */
100static int alloc_io_space(struct pcmcia_socket *s, struct resource *res,
101 unsigned int lines)
102{
103 unsigned int align;
104 unsigned int base = res->start;
105 unsigned int num = res->end;
106 int ret;
107
108 res->flags |= IORESOURCE_IO;
109
110 dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n",
111 res, lines);
112
113 align = base ? (lines ? 1<<lines : 0) : 1;
114 if (align && (align < num)) {
115 if (base) {
116 dev_dbg(&s->dev, "odd IO request\n");
117 align = 0;
118 } else
119 while (align && (align < num))
120 align <<= 1;
121 }
122 if (base & ~(align-1)) {
123 dev_dbg(&s->dev, "odd IO request\n");
124 align = 0;
125 }
126
127 ret = s->resource_ops->find_io(s, res->flags, &base, num, align,
128 &res->parent);
129 if (ret) {
130 dev_dbg(&s->dev, "alloc_io_space request failed (%d)\n", ret);
131 return -EINVAL;
132 }
133
134 res->start = base;
135 res->end = res->start + num - 1;
136
137 if (res->parent) {
138 ret = request_resource(res->parent, res);
139 if (ret) {
140 dev_warn(&s->dev,
141 "request_resource %pR failed: %d\n", res, ret);
142 res->parent = NULL;
143 release_io_space(s, res);
144 }
145 }
146 dev_dbg(&s->dev, "alloc_io_space request result %d: %pR\n", ret, res);
147 return ret;
148}
149
150
151/**
152 * pcmcia_access_config() - read or write card configuration registers
153 *
154 * pcmcia_access_config() reads and writes configuration registers in
155 * attribute memory. Memory window 0 is reserved for this and the tuple
156 * reading services. Drivers must use pcmcia_read_config_byte() or
157 * pcmcia_write_config_byte().
158 */
159static int pcmcia_access_config(struct pcmcia_device *p_dev,
160 off_t where, u8 *val,
161 int (*accessf) (struct pcmcia_socket *s,
162 int attr, unsigned int addr,
163 unsigned int len, void *ptr))
164{
165 struct pcmcia_socket *s;
166 config_t *c;
167 int addr;
168 int ret = 0;
169
170 s = p_dev->socket;
171
172 mutex_lock(&s->ops_mutex);
173 c = p_dev->function_config;
174
175 if (!(c->state & CONFIG_LOCKED)) {
176 dev_dbg(&p_dev->dev, "Configuration isn't locked\n");
177 mutex_unlock(&s->ops_mutex);
178 return -EACCES;
179 }
180
181 addr = (p_dev->config_base + where) >> 1;
182
183 ret = accessf(s, 1, addr, 1, val);
184
185 mutex_unlock(&s->ops_mutex);
186
187 return ret;
188}
189
190
191/**
192 * pcmcia_read_config_byte() - read a byte from a card configuration register
193 *
194 * pcmcia_read_config_byte() reads a byte from a configuration register in
195 * attribute memory.
196 */
197int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val)
198{
199 return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem);
200}
201EXPORT_SYMBOL(pcmcia_read_config_byte);
202
203
204/**
205 * pcmcia_write_config_byte() - write a byte to a card configuration register
206 *
207 * pcmcia_write_config_byte() writes a byte to a configuration register in
208 * attribute memory.
209 */
210int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val)
211{
212 return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem);
213}
214EXPORT_SYMBOL(pcmcia_write_config_byte);
215
216
217/**
218 * pcmcia_map_mem_page() - modify iomem window to point to a different offset
219 * @p_dev: pcmcia device
220 * @res: iomem resource already enabled by pcmcia_request_window()
221 * @offset: card_offset to map
222 *
223 * pcmcia_map_mem_page() modifies what can be read and written by accessing
224 * an iomem range previously enabled by pcmcia_request_window(), by setting
225 * the card_offset value to @offset.
226 */
227int pcmcia_map_mem_page(struct pcmcia_device *p_dev, struct resource *res,
228 unsigned int offset)
229{
230 struct pcmcia_socket *s = p_dev->socket;
231 unsigned int w;
232 int ret;
233
234 w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
235 if (w >= MAX_WIN)
236 return -EINVAL;
237
238 mutex_lock(&s->ops_mutex);
239 s->win[w].card_start = offset;
240 ret = s->ops->set_mem_map(s, &s->win[w]);
241 if (ret)
242 dev_warn(&p_dev->dev, "failed to set_mem_map\n");
243 mutex_unlock(&s->ops_mutex);
244 return ret;
245}
246EXPORT_SYMBOL(pcmcia_map_mem_page);
247
248
249/**
250 * pcmcia_fixup_iowidth() - reduce io width to 8bit
251 * @p_dev: pcmcia device
252 *
253 * pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the
254 * IO width to 8bit after having called pcmcia_enable_device()
255 * previously.
256 */
257int pcmcia_fixup_iowidth(struct pcmcia_device *p_dev)
258{
259 struct pcmcia_socket *s = p_dev->socket;
260 pccard_io_map io_off = { 0, 0, 0, 0, 1 };
261 pccard_io_map io_on;
262 int i, ret = 0;
263
264 mutex_lock(&s->ops_mutex);
265
266 dev_dbg(&p_dev->dev, "fixup iowidth to 8bit\n");
267
268 if (!(s->state & SOCKET_PRESENT) ||
269 !(p_dev->function_config->state & CONFIG_LOCKED)) {
270 dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
271 ret = -EACCES;
272 goto unlock;
273 }
274
275 io_on.speed = io_speed;
276 for (i = 0; i < MAX_IO_WIN; i++) {
277 if (!s->io[i].res)
278 continue;
279 io_off.map = i;
280 io_on.map = i;
281
282 io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
283 io_on.start = s->io[i].res->start;
284 io_on.stop = s->io[i].res->end;
285
286 s->ops->set_io_map(s, &io_off);
287 msleep(40);
288 s->ops->set_io_map(s, &io_on);
289 }
290unlock:
291 mutex_unlock(&s->ops_mutex);
292
293 return ret;
294}
295EXPORT_SYMBOL(pcmcia_fixup_iowidth);
296
297
298/**
299 * pcmcia_fixup_vpp() - set Vpp to a new voltage level
300 * @p_dev: pcmcia device
301 * @new_vpp: new Vpp voltage
302 *
303 * pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to
304 * a new voltage level between calls to pcmcia_enable_device()
305 * and pcmcia_disable_device().
306 */
307int pcmcia_fixup_vpp(struct pcmcia_device *p_dev, unsigned char new_vpp)
308{
309 struct pcmcia_socket *s = p_dev->socket;
310 int ret = 0;
311
312 mutex_lock(&s->ops_mutex);
313
314 dev_dbg(&p_dev->dev, "fixup Vpp to %d\n", new_vpp);
315
316 if (!(s->state & SOCKET_PRESENT) ||
317 !(p_dev->function_config->state & CONFIG_LOCKED)) {
318 dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
319 ret = -EACCES;
320 goto unlock;
321 }
322
323 s->socket.Vpp = new_vpp;
324 if (s->ops->set_socket(s, &s->socket)) {
325 dev_warn(&p_dev->dev, "Unable to set VPP\n");
326 ret = -EIO;
327 goto unlock;
328 }
329 p_dev->vpp = new_vpp;
330
331unlock:
332 mutex_unlock(&s->ops_mutex);
333
334 return ret;
335}
336EXPORT_SYMBOL(pcmcia_fixup_vpp);
337
338
339/**
340 * pcmcia_release_configuration() - physically disable a PCMCIA device
341 * @p_dev: pcmcia device
342 *
343 * pcmcia_release_configuration() is the 1:1 counterpart to
344 * pcmcia_enable_device(): If a PCMCIA device is no longer used by any
345 * driver, the Vpp voltage is set to 0, IRQs will no longer be generated,
346 * and I/O ranges will be disabled. As pcmcia_release_io() and
347 * pcmcia_release_window() still need to be called, device drivers are
348 * expected to call pcmcia_disable_device() instead.
349 */
350int pcmcia_release_configuration(struct pcmcia_device *p_dev)
351{
352 pccard_io_map io = { 0, 0, 0, 0, 1 };
353 struct pcmcia_socket *s = p_dev->socket;
354 config_t *c;
355 int i;
356
357 mutex_lock(&s->ops_mutex);
358 c = p_dev->function_config;
359 if (p_dev->_locked) {
360 p_dev->_locked = 0;
361 if (--(s->lock_count) == 0) {
362 s->socket.flags = SS_OUTPUT_ENA; /* Is this correct? */
363 s->socket.Vpp = 0;
364 s->socket.io_irq = 0;
365 s->ops->set_socket(s, &s->socket);
366 }
367 }
368 if (c->state & CONFIG_LOCKED) {
369 c->state &= ~CONFIG_LOCKED;
370 if (c->state & CONFIG_IO_REQ)
371 for (i = 0; i < MAX_IO_WIN; i++) {
372 if (!s->io[i].res)
373 continue;
374 s->io[i].Config--;
375 if (s->io[i].Config != 0)
376 continue;
377 io.map = i;
378 s->ops->set_io_map(s, &io);
379 }
380 }
381 mutex_unlock(&s->ops_mutex);
382
383 return 0;
384}
385
386
387/**
388 * pcmcia_release_io() - release I/O allocated by a PCMCIA device
389 * @p_dev: pcmcia device
390 *
391 * pcmcia_release_io() releases the I/O ranges allocated by a PCMCIA
392 * device. This may be invoked some time after a card ejection has
393 * already dumped the actual socket configuration, so if the client is
394 * "stale", we don't bother checking the port ranges against the
395 * current socket values.
396 */
397static int pcmcia_release_io(struct pcmcia_device *p_dev)
398{
399 struct pcmcia_socket *s = p_dev->socket;
400 int ret = -EINVAL;
401 config_t *c;
402
403 mutex_lock(&s->ops_mutex);
404 if (!p_dev->_io)
405 goto out;
406
407 c = p_dev->function_config;
408
409 release_io_space(s, &c->io[0]);
410
411 if (c->io[1].end)
412 release_io_space(s, &c->io[1]);
413
414 p_dev->_io = 0;
415 c->state &= ~CONFIG_IO_REQ;
416
417out:
418 mutex_unlock(&s->ops_mutex);
419
420 return ret;
421} /* pcmcia_release_io */
422
423
424/**
425 * pcmcia_release_window() - release reserved iomem for PCMCIA devices
426 * @p_dev: pcmcia device
427 * @res: iomem resource to release
428 *
429 * pcmcia_release_window() releases &struct resource *res which was
430 * previously reserved by calling pcmcia_request_window().
431 */
432int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res)
433{
434 struct pcmcia_socket *s = p_dev->socket;
435 pccard_mem_map *win;
436 unsigned int w;
437
438 dev_dbg(&p_dev->dev, "releasing window %pR\n", res);
439
440 w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
441 if (w >= MAX_WIN)
442 return -EINVAL;
443
444 mutex_lock(&s->ops_mutex);
445 win = &s->win[w];
446
447 if (!(p_dev->_win & CLIENT_WIN_REQ(w))) {
448 dev_dbg(&p_dev->dev, "not releasing unknown window\n");
449 mutex_unlock(&s->ops_mutex);
450 return -EINVAL;
451 }
452
453 /* Shut down memory window */
454 win->flags &= ~MAP_ACTIVE;
455 s->ops->set_mem_map(s, win);
456 s->state &= ~SOCKET_WIN_REQ(w);
457
458 /* Release system memory */
459 if (win->res) {
460 release_resource(res);
461 release_resource(win->res);
462 kfree(win->res);
463 win->res = NULL;
464 }
465 res->start = res->end = 0;
466 res->flags = IORESOURCE_MEM;
467 p_dev->_win &= ~CLIENT_WIN_REQ(w);
468 mutex_unlock(&s->ops_mutex);
469
470 return 0;
471} /* pcmcia_release_window */
472EXPORT_SYMBOL(pcmcia_release_window);
473
474
475/**
476 * pcmcia_enable_device() - set up and activate a PCMCIA device
477 * @p_dev: the associated PCMCIA device
478 *
479 * pcmcia_enable_device() physically enables a PCMCIA device. It parses
480 * the flags passed to in @flags and stored in @p_dev->flags and sets up
481 * the Vpp voltage, enables the speaker line, I/O ports and store proper
482 * values to configuration registers.
483 */
484int pcmcia_enable_device(struct pcmcia_device *p_dev)
485{
486 int i;
487 unsigned int base;
488 struct pcmcia_socket *s = p_dev->socket;
489 config_t *c;
490 pccard_io_map iomap;
491 unsigned char status = 0;
492 unsigned char ext_status = 0;
493 unsigned char option = 0;
494 unsigned int flags = p_dev->config_flags;
495
496 if (!(s->state & SOCKET_PRESENT))
497 return -ENODEV;
498
499 mutex_lock(&s->ops_mutex);
500 c = p_dev->function_config;
501 if (c->state & CONFIG_LOCKED) {
502 mutex_unlock(&s->ops_mutex);
503 dev_dbg(&p_dev->dev, "Configuration is locked\n");
504 return -EACCES;
505 }
506
507 /* Do power control. We don't allow changes in Vcc. */
508 s->socket.Vpp = p_dev->vpp;
509 if (s->ops->set_socket(s, &s->socket)) {
510 mutex_unlock(&s->ops_mutex);
511 dev_warn(&p_dev->dev, "Unable to set socket state\n");
512 return -EINVAL;
513 }
514
515 /* Pick memory or I/O card, DMA mode, interrupt */
516 if (p_dev->_io || flags & CONF_ENABLE_IRQ)
517 flags |= CONF_ENABLE_IOCARD;
518 if (flags & CONF_ENABLE_IOCARD)
519 s->socket.flags |= SS_IOCARD;
520 if (flags & CONF_ENABLE_ZVCARD)
521 s->socket.flags |= SS_ZVCARD | SS_IOCARD;
522 if (flags & CONF_ENABLE_SPKR) {
523 s->socket.flags |= SS_SPKR_ENA;
524 status = CCSR_AUDIO_ENA;
525 if (!(p_dev->config_regs & PRESENT_STATUS))
526 dev_warn(&p_dev->dev, "speaker requested, but "
527 "PRESENT_STATUS not set!\n");
528 }
529 if (flags & CONF_ENABLE_IRQ)
530 s->socket.io_irq = s->pcmcia_irq;
531 else
532 s->socket.io_irq = 0;
533 if (flags & CONF_ENABLE_ESR) {
534 p_dev->config_regs |= PRESENT_EXT_STATUS;
535 ext_status = ESR_REQ_ATTN_ENA;
536 }
537 s->ops->set_socket(s, &s->socket);
538 s->lock_count++;
539
540 dev_dbg(&p_dev->dev,
541 "enable_device: V %d, flags %x, base %x, regs %x, idx %x\n",
542 p_dev->vpp, flags, p_dev->config_base, p_dev->config_regs,
543 p_dev->config_index);
544
545 /* Set up CIS configuration registers */
546 base = p_dev->config_base;
547 if (p_dev->config_regs & PRESENT_COPY) {
548 u16 tmp = 0;
549 dev_dbg(&p_dev->dev, "clearing CISREG_SCR\n");
550 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &tmp);
551 }
552 if (p_dev->config_regs & PRESENT_PIN_REPLACE) {
553 u16 tmp = 0;
554 dev_dbg(&p_dev->dev, "clearing CISREG_PRR\n");
555 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &tmp);
556 }
557 if (p_dev->config_regs & PRESENT_OPTION) {
558 if (s->functions == 1) {
559 option = p_dev->config_index & COR_CONFIG_MASK;
560 } else {
561 option = p_dev->config_index & COR_MFC_CONFIG_MASK;
562 option |= COR_FUNC_ENA|COR_IREQ_ENA;
563 if (p_dev->config_regs & PRESENT_IOBASE_0)
564 option |= COR_ADDR_DECODE;
565 }
566 if ((flags & CONF_ENABLE_IRQ) &&
567 !(flags & CONF_ENABLE_PULSE_IRQ))
568 option |= COR_LEVEL_REQ;
569 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &option);
570 msleep(40);
571 }
572 if (p_dev->config_regs & PRESENT_STATUS)
573 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &status);
574
575 if (p_dev->config_regs & PRESENT_EXT_STATUS)
576 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1,
577 &ext_status);
578
579 if (p_dev->config_regs & PRESENT_IOBASE_0) {
580 u8 b = c->io[0].start & 0xff;
581 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
582 b = (c->io[0].start >> 8) & 0xff;
583 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
584 }
585 if (p_dev->config_regs & PRESENT_IOSIZE) {
586 u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1;
587 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
588 }
589
590 /* Configure I/O windows */
591 if (c->state & CONFIG_IO_REQ) {
592 iomap.speed = io_speed;
593 for (i = 0; i < MAX_IO_WIN; i++)
594 if (s->io[i].res) {
595 iomap.map = i;
596 iomap.flags = MAP_ACTIVE;
597 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
598 case IO_DATA_PATH_WIDTH_16:
599 iomap.flags |= MAP_16BIT; break;
600 case IO_DATA_PATH_WIDTH_AUTO:
601 iomap.flags |= MAP_AUTOSZ; break;
602 default:
603 break;
604 }
605 iomap.start = s->io[i].res->start;
606 iomap.stop = s->io[i].res->end;
607 s->ops->set_io_map(s, &iomap);
608 s->io[i].Config++;
609 }
610 }
611
612 c->state |= CONFIG_LOCKED;
613 p_dev->_locked = 1;
614 mutex_unlock(&s->ops_mutex);
615 return 0;
616} /* pcmcia_enable_device */
617EXPORT_SYMBOL(pcmcia_enable_device);
618
619
620/**
621 * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices
622 * @p_dev: the associated PCMCIA device
623 *
624 * pcmcia_request_io() attempts to reserve the IO port ranges specified in
625 * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The
626 * "start" value is the requested start of the IO port resource; "end"
627 * reflects the number of ports requested. The number of IO lines requested
628 * is specified in &struct pcmcia_device @p_dev->io_lines.
629 */
630int pcmcia_request_io(struct pcmcia_device *p_dev)
631{
632 struct pcmcia_socket *s = p_dev->socket;
633 config_t *c = p_dev->function_config;
634 int ret = -EINVAL;
635
636 mutex_lock(&s->ops_mutex);
637 dev_dbg(&p_dev->dev, "pcmcia_request_io: %pR , %pR",
638 &c->io[0], &c->io[1]);
639
640 if (!(s->state & SOCKET_PRESENT)) {
641 dev_dbg(&p_dev->dev, "pcmcia_request_io: No card present\n");
642 goto out;
643 }
644
645 if (c->state & CONFIG_LOCKED) {
646 dev_dbg(&p_dev->dev, "Configuration is locked\n");
647 goto out;
648 }
649 if (c->state & CONFIG_IO_REQ) {
650 dev_dbg(&p_dev->dev, "IO already configured\n");
651 goto out;
652 }
653
654 ret = alloc_io_space(s, &c->io[0], p_dev->io_lines);
655 if (ret)
656 goto out;
657
658 if (c->io[1].end) {
659 ret = alloc_io_space(s, &c->io[1], p_dev->io_lines);
660 if (ret) {
661 struct resource tmp = c->io[0];
662 /* release the previously allocated resource */
663 release_io_space(s, &c->io[0]);
664 /* but preserve the settings, for they worked... */
665 c->io[0].end = resource_size(&tmp);
666 c->io[0].start = tmp.start;
667 c->io[0].flags = tmp.flags;
668 goto out;
669 }
670 } else
671 c->io[1].start = 0;
672
673 c->state |= CONFIG_IO_REQ;
674 p_dev->_io = 1;
675
676 dev_dbg(&p_dev->dev, "pcmcia_request_io succeeded: %pR , %pR",
677 &c->io[0], &c->io[1]);
678out:
679 mutex_unlock(&s->ops_mutex);
680
681 return ret;
682} /* pcmcia_request_io */
683EXPORT_SYMBOL(pcmcia_request_io);
684
685
686/**
687 * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
688 * @p_dev: the associated PCMCIA device
689 * @handler: IRQ handler to register
690 *
691 * pcmcia_request_irq() is a wrapper around request_irq() which allows
692 * the PCMCIA core to clean up the registration in pcmcia_disable_device().
693 * Drivers are free to use request_irq() directly, but then they need to
694 * call free_irq() themselfves, too. Also, only %IRQF_SHARED capable IRQ
695 * handlers are allowed.
696 */
697int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
698 irq_handler_t handler)
699{
700 int ret;
701
702 if (!p_dev->irq)
703 return -EINVAL;
704
705 ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
706 p_dev->devname, p_dev->priv);
707 if (!ret)
708 p_dev->_irq = 1;
709
710 return ret;
711}
712EXPORT_SYMBOL(pcmcia_request_irq);
713
714
715#ifdef CONFIG_PCMCIA_PROBE
716
717/* mask of IRQs already reserved by other cards, we should avoid using them */
718static u8 pcmcia_used_irq[32];
719
720static irqreturn_t test_action(int cpl, void *dev_id)
721{
722 return IRQ_NONE;
723}
724
725/**
726 * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
727 * @p_dev - the associated PCMCIA device
728 *
729 * locking note: must be called with ops_mutex locked.
730 */
731static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
732{
733 struct pcmcia_socket *s = p_dev->socket;
734 unsigned int try, irq;
735 u32 mask = s->irq_mask;
736 int ret = -ENODEV;
737
738 for (try = 0; try < 64; try++) {
739 irq = try % 32;
740
741 if (irq > NR_IRQS)
742 continue;
743
744 /* marked as available by driver, not blocked by userspace? */
745 if (!((mask >> irq) & 1))
746 continue;
747
748 /* avoid an IRQ which is already used by another PCMCIA card */
749 if ((try < 32) && pcmcia_used_irq[irq])
750 continue;
751
752 /* register the correct driver, if possible, to check whether
753 * registering a dummy handle works, i.e. if the IRQ isn't
754 * marked as used by the kernel resource management core */
755 ret = request_irq(irq, test_action, type, p_dev->devname,
756 p_dev);
757 if (!ret) {
758 free_irq(irq, p_dev);
759 p_dev->irq = s->pcmcia_irq = irq;
760 pcmcia_used_irq[irq]++;
761 break;
762 }
763 }
764
765 return ret;
766}
767
768void pcmcia_cleanup_irq(struct pcmcia_socket *s)
769{
770 pcmcia_used_irq[s->pcmcia_irq]--;
771 s->pcmcia_irq = 0;
772}
773
774#else /* CONFIG_PCMCIA_PROBE */
775
776static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
777{
778 return -EINVAL;
779}
780
781void pcmcia_cleanup_irq(struct pcmcia_socket *s)
782{
783 s->pcmcia_irq = 0;
784 return;
785}
786
787#endif /* CONFIG_PCMCIA_PROBE */
788
789
790/**
791 * pcmcia_setup_irq() - determine IRQ to be used for device
792 * @p_dev - the associated PCMCIA device
793 *
794 * locking note: must be called with ops_mutex locked.
795 */
796int pcmcia_setup_irq(struct pcmcia_device *p_dev)
797{
798 struct pcmcia_socket *s = p_dev->socket;
799
800 if (p_dev->irq)
801 return 0;
802
803 /* already assigned? */
804 if (s->pcmcia_irq) {
805 p_dev->irq = s->pcmcia_irq;
806 return 0;
807 }
808
809 /* prefer an exclusive ISA irq */
810 if (!pcmcia_setup_isa_irq(p_dev, 0))
811 return 0;
812
813 /* but accept a shared ISA irq */
814 if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
815 return 0;
816
817 /* but use the PCI irq otherwise */
818 if (s->pci_irq) {
819 p_dev->irq = s->pcmcia_irq = s->pci_irq;
820 return 0;
821 }
822
823 return -EINVAL;
824}
825
826
827/**
828 * pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices
829 * @p_dev: the associated PCMCIA device
830 * @res: &struct resource pointing to p_dev->resource[2..5]
831 * @speed: access speed
832 *
833 * pcmcia_request_window() attepts to reserve an iomem ranges specified in
834 * &struct resource @res pointing to one of the entries in
835 * &struct pcmcia_device @p_dev->resource[2..5]. The "start" value is the
836 * requested start of the IO mem resource; "end" reflects the size
837 * requested.
838 */
839int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res,
840 unsigned int speed)
841{
842 struct pcmcia_socket *s = p_dev->socket;
843 pccard_mem_map *win;
844 u_long align;
845 int w;
846
847 dev_dbg(&p_dev->dev, "request_window %pR %d\n", res, speed);
848
849 if (!(s->state & SOCKET_PRESENT)) {
850 dev_dbg(&p_dev->dev, "No card present\n");
851 return -ENODEV;
852 }
853
854 /* Window size defaults to smallest available */
855 if (res->end == 0)
856 res->end = s->map_size;
857 align = (s->features & SS_CAP_MEM_ALIGN) ? res->end : s->map_size;
858 if (res->end & (s->map_size-1)) {
859 dev_dbg(&p_dev->dev, "invalid map size\n");
860 return -EINVAL;
861 }
862 if ((res->start && (s->features & SS_CAP_STATIC_MAP)) ||
863 (res->start & (align-1))) {
864 dev_dbg(&p_dev->dev, "invalid base address\n");
865 return -EINVAL;
866 }
867 if (res->start)
868 align = 0;
869
870 /* Allocate system memory window */
871 mutex_lock(&s->ops_mutex);
872 for (w = 0; w < MAX_WIN; w++)
873 if (!(s->state & SOCKET_WIN_REQ(w)))
874 break;
875 if (w == MAX_WIN) {
876 dev_dbg(&p_dev->dev, "all windows are used already\n");
877 mutex_unlock(&s->ops_mutex);
878 return -EINVAL;
879 }
880
881 win = &s->win[w];
882
883 if (!(s->features & SS_CAP_STATIC_MAP)) {
884 win->res = pcmcia_find_mem_region(res->start, res->end, align,
885 0, s);
886 if (!win->res) {
887 dev_dbg(&p_dev->dev, "allocating mem region failed\n");
888 mutex_unlock(&s->ops_mutex);
889 return -EINVAL;
890 }
891 }
892 p_dev->_win |= CLIENT_WIN_REQ(w);
893
894 /* Configure the socket controller */
895 win->map = w+1;
896 win->flags = res->flags & WIN_FLAGS_MAP;
897 win->speed = speed;
898 win->card_start = 0;
899
900 if (s->ops->set_mem_map(s, win) != 0) {
901 dev_dbg(&p_dev->dev, "failed to set memory mapping\n");
902 mutex_unlock(&s->ops_mutex);
903 return -EIO;
904 }
905 s->state |= SOCKET_WIN_REQ(w);
906
907 /* Return window handle */
908 if (s->features & SS_CAP_STATIC_MAP)
909 res->start = win->static_start;
910 else
911 res->start = win->res->start;
912
913 /* convert to new-style resources */
914 res->end += res->start - 1;
915 res->flags &= ~WIN_FLAGS_REQ;
916 res->flags |= (win->map << 2) | IORESOURCE_MEM;
917 res->parent = win->res;
918 if (win->res)
919 request_resource(&iomem_resource, res);
920
921 dev_dbg(&p_dev->dev, "request_window results in %pR\n", res);
922
923 mutex_unlock(&s->ops_mutex);
924
925 return 0;
926} /* pcmcia_request_window */
927EXPORT_SYMBOL(pcmcia_request_window);
928
929
930/**
931 * pcmcia_disable_device() - disable and clean up a PCMCIA device
932 * @p_dev: the associated PCMCIA device
933 *
934 * pcmcia_disable_device() is the driver-callable counterpart to
935 * pcmcia_enable_device(): If a PCMCIA device is no longer used,
936 * drivers are expected to clean up and disable the device by calling
937 * this function. Any I/O ranges (iomem and ioports) will be released,
938 * the Vpp voltage will be set to 0, and IRQs will no longer be
939 * generated -- at least if there is no other card function (of
940 * multifunction devices) being used.
941 */
942void pcmcia_disable_device(struct pcmcia_device *p_dev)
943{
944 int i;
945
946 dev_dbg(&p_dev->dev, "disabling device\n");
947
948 for (i = 0; i < MAX_WIN; i++) {
949 struct resource *res = p_dev->resource[MAX_IO_WIN + i];
950 if (res->flags & WIN_FLAGS_REQ)
951 pcmcia_release_window(p_dev, res);
952 }
953
954 pcmcia_release_configuration(p_dev);
955 pcmcia_release_io(p_dev);
956 if (p_dev->_irq) {
957 free_irq(p_dev->irq, p_dev->priv);
958 p_dev->_irq = 0;
959 }
960}
961EXPORT_SYMBOL(pcmcia_disable_device);
962