1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * PCMCIA 16-bit resource management functions
4 *
5 * The initial developer of the original code is David A. Hinds
6 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
7 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
8 *
9 * Copyright (C) 1999 David A. Hinds
10 * Copyright (C) 2004-2010 Dominik Brodowski
11 */
12
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/interrupt.h>
16 #include <linux/delay.h>
17 #include <linux/pci.h>
18 #include <linux/device.h>
19 #include <linux/netdevice.h>
20 #include <linux/slab.h>
21
22 #include <asm/irq.h>
23
24 #include <pcmcia/ss.h>
25 #include <pcmcia/cistpl.h>
26 #include <pcmcia/cisreg.h>
27 #include <pcmcia/ds.h>
28
29 #include "cs_internal.h"
30
31
32 /* Access speed for IO windows */
33 static int io_speed;
34 module_param(io_speed, int, 0444);
35
36
pcmcia_validate_mem(struct pcmcia_socket * s)37 int pcmcia_validate_mem(struct pcmcia_socket *s)
38 {
39 if (s->resource_ops->validate_mem)
40 return s->resource_ops->validate_mem(s);
41 /* if there is no callback, we can assume that everything is OK */
42 return 0;
43 }
44
pcmcia_find_mem_region(u_long base,u_long num,u_long align,int low,struct pcmcia_socket * s)45 struct resource *pcmcia_find_mem_region(u_long base, u_long num, u_long align,
46 int low, struct pcmcia_socket *s)
47 {
48 if (s->resource_ops->find_mem)
49 return s->resource_ops->find_mem(base, num, align, low, s);
50 return NULL;
51 }
52
53
54 /**
55 * release_io_space() - release IO ports allocated with alloc_io_space()
56 * @s: pcmcia socket
57 * @res: resource to release
58 *
59 */
release_io_space(struct pcmcia_socket * s,struct resource * res)60 static void release_io_space(struct pcmcia_socket *s, struct resource *res)
61 {
62 resource_size_t num = resource_size(res);
63 int i;
64
65 dev_dbg(&s->dev, "release_io_space for %pR\n", res);
66
67 for (i = 0; i < MAX_IO_WIN; i++) {
68 if (!s->io[i].res)
69 continue;
70 if ((s->io[i].res->start <= res->start) &&
71 (s->io[i].res->end >= res->end)) {
72 s->io[i].InUse -= num;
73 if (res->parent)
74 release_resource(res);
75 res->start = res->end = 0;
76 res->flags = IORESOURCE_IO;
77 /* Free the window if no one else is using it */
78 if (s->io[i].InUse == 0) {
79 release_resource(s->io[i].res);
80 kfree(s->io[i].res);
81 s->io[i].res = NULL;
82 }
83 }
84 }
85 }
86
87
88 /**
89 * alloc_io_space() - allocate IO ports for use by a PCMCIA device
90 * @s: pcmcia socket
91 * @res: resource to allocate (begin: begin, end: size)
92 * @lines: number of IO lines decoded by the PCMCIA card
93 *
94 * Special stuff for managing IO windows, because they are scarce
95 */
alloc_io_space(struct pcmcia_socket * s,struct resource * res,unsigned int lines)96 static int alloc_io_space(struct pcmcia_socket *s, struct resource *res,
97 unsigned int lines)
98 {
99 unsigned int align;
100 unsigned int base = res->start;
101 unsigned int num = res->end;
102 int ret;
103
104 res->flags |= IORESOURCE_IO;
105
106 dev_dbg(&s->dev, "alloc_io_space request for %pR, %d lines\n",
107 res, lines);
108
109 align = base ? (lines ? 1<<lines : 0) : 1;
110 if (align && (align < num)) {
111 if (base) {
112 dev_dbg(&s->dev, "odd IO request\n");
113 align = 0;
114 } else
115 while (align && (align < num))
116 align <<= 1;
117 }
118 if (base & ~(align-1)) {
119 dev_dbg(&s->dev, "odd IO request\n");
120 align = 0;
121 }
122
123 ret = s->resource_ops->find_io(s, res->flags, &base, num, align,
124 &res->parent);
125 if (ret) {
126 dev_dbg(&s->dev, "alloc_io_space request failed (%d)\n", ret);
127 return -EINVAL;
128 }
129
130 res->start = base;
131 res->end = res->start + num - 1;
132
133 if (res->parent) {
134 ret = request_resource(res->parent, res);
135 if (ret) {
136 dev_warn(&s->dev,
137 "request_resource %pR failed: %d\n", res, ret);
138 res->parent = NULL;
139 release_io_space(s, res);
140 }
141 }
142 dev_dbg(&s->dev, "alloc_io_space request result %d: %pR\n", ret, res);
143 return ret;
144 }
145
146
147 /*
148 * pcmcia_access_config() - read or write card configuration registers
149 *
150 * pcmcia_access_config() reads and writes configuration registers in
151 * attribute memory. Memory window 0 is reserved for this and the tuple
152 * reading services. Drivers must use pcmcia_read_config_byte() or
153 * pcmcia_write_config_byte().
154 */
pcmcia_access_config(struct pcmcia_device * p_dev,off_t where,u8 * val,int (* accessf)(struct pcmcia_socket * s,int attr,unsigned int addr,unsigned int len,void * ptr))155 static int pcmcia_access_config(struct pcmcia_device *p_dev,
156 off_t where, u8 *val,
157 int (*accessf) (struct pcmcia_socket *s,
158 int attr, unsigned int addr,
159 unsigned int len, void *ptr))
160 {
161 struct pcmcia_socket *s;
162 config_t *c;
163 int addr;
164 int ret = 0;
165
166 s = p_dev->socket;
167
168 mutex_lock(&s->ops_mutex);
169 c = p_dev->function_config;
170
171 if (!(c->state & CONFIG_LOCKED)) {
172 dev_dbg(&p_dev->dev, "Configuration isn't locked\n");
173 mutex_unlock(&s->ops_mutex);
174 return -EACCES;
175 }
176
177 addr = (p_dev->config_base + where) >> 1;
178
179 ret = accessf(s, 1, addr, 1, val);
180
181 mutex_unlock(&s->ops_mutex);
182
183 return ret;
184 }
185
186
187 /*
188 * pcmcia_read_config_byte() - read a byte from a card configuration register
189 *
190 * pcmcia_read_config_byte() reads a byte from a configuration register in
191 * attribute memory.
192 */
pcmcia_read_config_byte(struct pcmcia_device * p_dev,off_t where,u8 * val)193 int pcmcia_read_config_byte(struct pcmcia_device *p_dev, off_t where, u8 *val)
194 {
195 return pcmcia_access_config(p_dev, where, val, pcmcia_read_cis_mem);
196 }
197 EXPORT_SYMBOL(pcmcia_read_config_byte);
198
199
200 /*
201 * pcmcia_write_config_byte() - write a byte to a card configuration register
202 *
203 * pcmcia_write_config_byte() writes a byte to a configuration register in
204 * attribute memory.
205 */
pcmcia_write_config_byte(struct pcmcia_device * p_dev,off_t where,u8 val)206 int pcmcia_write_config_byte(struct pcmcia_device *p_dev, off_t where, u8 val)
207 {
208 return pcmcia_access_config(p_dev, where, &val, pcmcia_write_cis_mem);
209 }
210 EXPORT_SYMBOL(pcmcia_write_config_byte);
211
212
213 /**
214 * pcmcia_map_mem_page() - modify iomem window to point to a different offset
215 * @p_dev: pcmcia device
216 * @res: iomem resource already enabled by pcmcia_request_window()
217 * @offset: card_offset to map
218 *
219 * pcmcia_map_mem_page() modifies what can be read and written by accessing
220 * an iomem range previously enabled by pcmcia_request_window(), by setting
221 * the card_offset value to @offset.
222 */
pcmcia_map_mem_page(struct pcmcia_device * p_dev,struct resource * res,unsigned int offset)223 int pcmcia_map_mem_page(struct pcmcia_device *p_dev, struct resource *res,
224 unsigned int offset)
225 {
226 struct pcmcia_socket *s = p_dev->socket;
227 unsigned int w;
228 int ret;
229
230 w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
231 if (w >= MAX_WIN)
232 return -EINVAL;
233
234 mutex_lock(&s->ops_mutex);
235 s->win[w].card_start = offset;
236 ret = s->ops->set_mem_map(s, &s->win[w]);
237 if (ret)
238 dev_warn(&p_dev->dev, "failed to set_mem_map\n");
239 mutex_unlock(&s->ops_mutex);
240 return ret;
241 }
242 EXPORT_SYMBOL(pcmcia_map_mem_page);
243
244
245 /**
246 * pcmcia_fixup_iowidth() - reduce io width to 8bit
247 * @p_dev: pcmcia device
248 *
249 * pcmcia_fixup_iowidth() allows a PCMCIA device driver to reduce the
250 * IO width to 8bit after having called pcmcia_enable_device()
251 * previously.
252 */
pcmcia_fixup_iowidth(struct pcmcia_device * p_dev)253 int pcmcia_fixup_iowidth(struct pcmcia_device *p_dev)
254 {
255 struct pcmcia_socket *s = p_dev->socket;
256 pccard_io_map io_off = { 0, 0, 0, 0, 1 };
257 pccard_io_map io_on;
258 int i, ret = 0;
259
260 mutex_lock(&s->ops_mutex);
261
262 dev_dbg(&p_dev->dev, "fixup iowidth to 8bit\n");
263
264 if (!(s->state & SOCKET_PRESENT) ||
265 !(p_dev->function_config->state & CONFIG_LOCKED)) {
266 dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
267 ret = -EACCES;
268 goto unlock;
269 }
270
271 io_on.speed = io_speed;
272 for (i = 0; i < MAX_IO_WIN; i++) {
273 if (!s->io[i].res)
274 continue;
275 io_off.map = i;
276 io_on.map = i;
277
278 io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
279 io_on.start = s->io[i].res->start;
280 io_on.stop = s->io[i].res->end;
281
282 s->ops->set_io_map(s, &io_off);
283 msleep(40);
284 s->ops->set_io_map(s, &io_on);
285 }
286 unlock:
287 mutex_unlock(&s->ops_mutex);
288
289 return ret;
290 }
291 EXPORT_SYMBOL(pcmcia_fixup_iowidth);
292
293
294 /**
295 * pcmcia_fixup_vpp() - set Vpp to a new voltage level
296 * @p_dev: pcmcia device
297 * @new_vpp: new Vpp voltage
298 *
299 * pcmcia_fixup_vpp() allows a PCMCIA device driver to set Vpp to
300 * a new voltage level between calls to pcmcia_enable_device()
301 * and pcmcia_disable_device().
302 */
pcmcia_fixup_vpp(struct pcmcia_device * p_dev,unsigned char new_vpp)303 int pcmcia_fixup_vpp(struct pcmcia_device *p_dev, unsigned char new_vpp)
304 {
305 struct pcmcia_socket *s = p_dev->socket;
306 int ret = 0;
307
308 mutex_lock(&s->ops_mutex);
309
310 dev_dbg(&p_dev->dev, "fixup Vpp to %d\n", new_vpp);
311
312 if (!(s->state & SOCKET_PRESENT) ||
313 !(p_dev->function_config->state & CONFIG_LOCKED)) {
314 dev_dbg(&p_dev->dev, "No card? Config not locked?\n");
315 ret = -EACCES;
316 goto unlock;
317 }
318
319 s->socket.Vpp = new_vpp;
320 if (s->ops->set_socket(s, &s->socket)) {
321 dev_warn(&p_dev->dev, "Unable to set VPP\n");
322 ret = -EIO;
323 goto unlock;
324 }
325 p_dev->vpp = new_vpp;
326
327 unlock:
328 mutex_unlock(&s->ops_mutex);
329
330 return ret;
331 }
332 EXPORT_SYMBOL(pcmcia_fixup_vpp);
333
334
335 /**
336 * pcmcia_release_configuration() - physically disable a PCMCIA device
337 * @p_dev: pcmcia device
338 *
339 * pcmcia_release_configuration() is the 1:1 counterpart to
340 * pcmcia_enable_device(): If a PCMCIA device is no longer used by any
341 * driver, the Vpp voltage is set to 0, IRQs will no longer be generated,
342 * and I/O ranges will be disabled. As pcmcia_release_io() and
343 * pcmcia_release_window() still need to be called, device drivers are
344 * expected to call pcmcia_disable_device() instead.
345 */
pcmcia_release_configuration(struct pcmcia_device * p_dev)346 int pcmcia_release_configuration(struct pcmcia_device *p_dev)
347 {
348 pccard_io_map io = { 0, 0, 0, 0, 1 };
349 struct pcmcia_socket *s = p_dev->socket;
350 config_t *c;
351 int i;
352
353 mutex_lock(&s->ops_mutex);
354 c = p_dev->function_config;
355 if (p_dev->_locked) {
356 p_dev->_locked = 0;
357 if (--(s->lock_count) == 0) {
358 s->socket.flags = SS_OUTPUT_ENA; /* Is this correct? */
359 s->socket.Vpp = 0;
360 s->socket.io_irq = 0;
361 s->ops->set_socket(s, &s->socket);
362 }
363 }
364 if (c->state & CONFIG_LOCKED) {
365 c->state &= ~CONFIG_LOCKED;
366 if (c->state & CONFIG_IO_REQ)
367 for (i = 0; i < MAX_IO_WIN; i++) {
368 if (!s->io[i].res)
369 continue;
370 s->io[i].Config--;
371 if (s->io[i].Config != 0)
372 continue;
373 io.map = i;
374 s->ops->set_io_map(s, &io);
375 }
376 }
377 mutex_unlock(&s->ops_mutex);
378
379 return 0;
380 }
381
382
383 /**
384 * pcmcia_release_io() - release I/O allocated by a PCMCIA device
385 * @p_dev: pcmcia device
386 *
387 * pcmcia_release_io() releases the I/O ranges allocated by a PCMCIA
388 * device. This may be invoked some time after a card ejection has
389 * already dumped the actual socket configuration, so if the client is
390 * "stale", we don't bother checking the port ranges against the
391 * current socket values.
392 */
pcmcia_release_io(struct pcmcia_device * p_dev)393 static void pcmcia_release_io(struct pcmcia_device *p_dev)
394 {
395 struct pcmcia_socket *s = p_dev->socket;
396 config_t *c;
397
398 mutex_lock(&s->ops_mutex);
399 if (!p_dev->_io)
400 goto out;
401
402 c = p_dev->function_config;
403
404 release_io_space(s, &c->io[0]);
405
406 if (c->io[1].end)
407 release_io_space(s, &c->io[1]);
408
409 p_dev->_io = 0;
410 c->state &= ~CONFIG_IO_REQ;
411
412 out:
413 mutex_unlock(&s->ops_mutex);
414 } /* pcmcia_release_io */
415
416
417 /**
418 * pcmcia_release_window() - release reserved iomem for PCMCIA devices
419 * @p_dev: pcmcia device
420 * @res: iomem resource to release
421 *
422 * pcmcia_release_window() releases &struct resource *res which was
423 * previously reserved by calling pcmcia_request_window().
424 */
pcmcia_release_window(struct pcmcia_device * p_dev,struct resource * res)425 int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res)
426 {
427 struct pcmcia_socket *s = p_dev->socket;
428 pccard_mem_map *win;
429 unsigned int w;
430
431 dev_dbg(&p_dev->dev, "releasing window %pR\n", res);
432
433 w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
434 if (w >= MAX_WIN)
435 return -EINVAL;
436
437 mutex_lock(&s->ops_mutex);
438 win = &s->win[w];
439
440 if (!(p_dev->_win & CLIENT_WIN_REQ(w))) {
441 dev_dbg(&p_dev->dev, "not releasing unknown window\n");
442 mutex_unlock(&s->ops_mutex);
443 return -EINVAL;
444 }
445
446 /* Shut down memory window */
447 win->flags &= ~MAP_ACTIVE;
448 s->ops->set_mem_map(s, win);
449 s->state &= ~SOCKET_WIN_REQ(w);
450
451 /* Release system memory */
452 if (win->res) {
453 release_resource(res);
454 release_resource(win->res);
455 kfree(win->res);
456 win->res = NULL;
457 }
458 res->start = res->end = 0;
459 res->flags = IORESOURCE_MEM;
460 p_dev->_win &= ~CLIENT_WIN_REQ(w);
461 mutex_unlock(&s->ops_mutex);
462
463 return 0;
464 } /* pcmcia_release_window */
465 EXPORT_SYMBOL(pcmcia_release_window);
466
467
468 /**
469 * pcmcia_enable_device() - set up and activate a PCMCIA device
470 * @p_dev: the associated PCMCIA device
471 *
472 * pcmcia_enable_device() physically enables a PCMCIA device. It parses
473 * the flags passed to in @flags and stored in @p_dev->flags and sets up
474 * the Vpp voltage, enables the speaker line, I/O ports and store proper
475 * values to configuration registers.
476 */
pcmcia_enable_device(struct pcmcia_device * p_dev)477 int pcmcia_enable_device(struct pcmcia_device *p_dev)
478 {
479 int i;
480 unsigned int base;
481 struct pcmcia_socket *s = p_dev->socket;
482 config_t *c;
483 pccard_io_map iomap;
484 unsigned char status = 0;
485 unsigned char ext_status = 0;
486 unsigned char option = 0;
487 unsigned int flags = p_dev->config_flags;
488
489 if (!(s->state & SOCKET_PRESENT))
490 return -ENODEV;
491
492 mutex_lock(&s->ops_mutex);
493 c = p_dev->function_config;
494 if (c->state & CONFIG_LOCKED) {
495 mutex_unlock(&s->ops_mutex);
496 dev_dbg(&p_dev->dev, "Configuration is locked\n");
497 return -EACCES;
498 }
499
500 /* Do power control. We don't allow changes in Vcc. */
501 s->socket.Vpp = p_dev->vpp;
502 if (s->ops->set_socket(s, &s->socket)) {
503 mutex_unlock(&s->ops_mutex);
504 dev_warn(&p_dev->dev, "Unable to set socket state\n");
505 return -EINVAL;
506 }
507
508 /* Pick memory or I/O card, DMA mode, interrupt */
509 if (p_dev->_io || flags & CONF_ENABLE_IRQ)
510 flags |= CONF_ENABLE_IOCARD;
511 if (flags & CONF_ENABLE_IOCARD)
512 s->socket.flags |= SS_IOCARD;
513 if (flags & CONF_ENABLE_ZVCARD)
514 s->socket.flags |= SS_ZVCARD | SS_IOCARD;
515 if (flags & CONF_ENABLE_SPKR) {
516 s->socket.flags |= SS_SPKR_ENA;
517 status = CCSR_AUDIO_ENA;
518 if (!(p_dev->config_regs & PRESENT_STATUS))
519 dev_warn(&p_dev->dev, "speaker requested, but "
520 "PRESENT_STATUS not set!\n");
521 }
522 if (flags & CONF_ENABLE_IRQ)
523 s->socket.io_irq = s->pcmcia_irq;
524 else
525 s->socket.io_irq = 0;
526 if (flags & CONF_ENABLE_ESR) {
527 p_dev->config_regs |= PRESENT_EXT_STATUS;
528 ext_status = ESR_REQ_ATTN_ENA;
529 }
530 s->ops->set_socket(s, &s->socket);
531 s->lock_count++;
532
533 dev_dbg(&p_dev->dev,
534 "enable_device: V %d, flags %x, base %x, regs %x, idx %x\n",
535 p_dev->vpp, flags, p_dev->config_base, p_dev->config_regs,
536 p_dev->config_index);
537
538 /* Set up CIS configuration registers */
539 base = p_dev->config_base;
540 if (p_dev->config_regs & PRESENT_COPY) {
541 u16 tmp = 0;
542 dev_dbg(&p_dev->dev, "clearing CISREG_SCR\n");
543 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &tmp);
544 }
545 if (p_dev->config_regs & PRESENT_PIN_REPLACE) {
546 u16 tmp = 0;
547 dev_dbg(&p_dev->dev, "clearing CISREG_PRR\n");
548 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &tmp);
549 }
550 if (p_dev->config_regs & PRESENT_OPTION) {
551 if (s->functions == 1) {
552 option = p_dev->config_index & COR_CONFIG_MASK;
553 } else {
554 option = p_dev->config_index & COR_MFC_CONFIG_MASK;
555 option |= COR_FUNC_ENA|COR_IREQ_ENA;
556 if (p_dev->config_regs & PRESENT_IOBASE_0)
557 option |= COR_ADDR_DECODE;
558 }
559 if ((flags & CONF_ENABLE_IRQ) &&
560 !(flags & CONF_ENABLE_PULSE_IRQ))
561 option |= COR_LEVEL_REQ;
562 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &option);
563 msleep(40);
564 }
565 if (p_dev->config_regs & PRESENT_STATUS)
566 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &status);
567
568 if (p_dev->config_regs & PRESENT_EXT_STATUS)
569 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1,
570 &ext_status);
571
572 if (p_dev->config_regs & PRESENT_IOBASE_0) {
573 u8 b = c->io[0].start & 0xff;
574 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
575 b = (c->io[0].start >> 8) & 0xff;
576 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
577 }
578 if (p_dev->config_regs & PRESENT_IOSIZE) {
579 u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1;
580 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
581 }
582
583 /* Configure I/O windows */
584 if (c->state & CONFIG_IO_REQ) {
585 iomap.speed = io_speed;
586 for (i = 0; i < MAX_IO_WIN; i++)
587 if (s->io[i].res) {
588 iomap.map = i;
589 iomap.flags = MAP_ACTIVE;
590 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
591 case IO_DATA_PATH_WIDTH_16:
592 iomap.flags |= MAP_16BIT; break;
593 case IO_DATA_PATH_WIDTH_AUTO:
594 iomap.flags |= MAP_AUTOSZ; break;
595 default:
596 break;
597 }
598 iomap.start = s->io[i].res->start;
599 iomap.stop = s->io[i].res->end;
600 s->ops->set_io_map(s, &iomap);
601 s->io[i].Config++;
602 }
603 }
604
605 c->state |= CONFIG_LOCKED;
606 p_dev->_locked = 1;
607 mutex_unlock(&s->ops_mutex);
608 return 0;
609 } /* pcmcia_enable_device */
610 EXPORT_SYMBOL(pcmcia_enable_device);
611
612
613 /**
614 * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices
615 * @p_dev: the associated PCMCIA device
616 *
617 * pcmcia_request_io() attempts to reserve the IO port ranges specified in
618 * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The
619 * "start" value is the requested start of the IO port resource; "end"
620 * reflects the number of ports requested. The number of IO lines requested
621 * is specified in &struct pcmcia_device @p_dev->io_lines.
622 */
pcmcia_request_io(struct pcmcia_device * p_dev)623 int pcmcia_request_io(struct pcmcia_device *p_dev)
624 {
625 struct pcmcia_socket *s = p_dev->socket;
626 config_t *c = p_dev->function_config;
627 int ret = -EINVAL;
628
629 mutex_lock(&s->ops_mutex);
630 dev_dbg(&p_dev->dev, "pcmcia_request_io: %pR , %pR",
631 &c->io[0], &c->io[1]);
632
633 if (!(s->state & SOCKET_PRESENT)) {
634 dev_dbg(&p_dev->dev, "pcmcia_request_io: No card present\n");
635 goto out;
636 }
637
638 if (c->state & CONFIG_LOCKED) {
639 dev_dbg(&p_dev->dev, "Configuration is locked\n");
640 goto out;
641 }
642 if (c->state & CONFIG_IO_REQ) {
643 dev_dbg(&p_dev->dev, "IO already configured\n");
644 goto out;
645 }
646
647 ret = alloc_io_space(s, &c->io[0], p_dev->io_lines);
648 if (ret)
649 goto out;
650
651 if (c->io[1].end) {
652 ret = alloc_io_space(s, &c->io[1], p_dev->io_lines);
653 if (ret) {
654 struct resource tmp = c->io[0];
655 /* release the previously allocated resource */
656 release_io_space(s, &c->io[0]);
657 /* but preserve the settings, for they worked... */
658 c->io[0].end = resource_size(&tmp);
659 c->io[0].start = tmp.start;
660 c->io[0].flags = tmp.flags;
661 goto out;
662 }
663 } else
664 c->io[1].start = 0;
665
666 c->state |= CONFIG_IO_REQ;
667 p_dev->_io = 1;
668
669 dev_dbg(&p_dev->dev, "pcmcia_request_io succeeded: %pR , %pR",
670 &c->io[0], &c->io[1]);
671 out:
672 mutex_unlock(&s->ops_mutex);
673
674 return ret;
675 } /* pcmcia_request_io */
676 EXPORT_SYMBOL(pcmcia_request_io);
677
678
679 /**
680 * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
681 * @p_dev: the associated PCMCIA device
682 * @handler: IRQ handler to register
683 *
684 * pcmcia_request_irq() is a wrapper around request_irq() which allows
685 * the PCMCIA core to clean up the registration in pcmcia_disable_device().
686 * Drivers are free to use request_irq() directly, but then they need to
687 * call free_irq() themselves, too. Also, only %IRQF_SHARED capable IRQ
688 * handlers are allowed.
689 */
pcmcia_request_irq(struct pcmcia_device * p_dev,irq_handler_t handler)690 int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
691 irq_handler_t handler)
692 {
693 int ret;
694
695 if (!p_dev->irq)
696 return -EINVAL;
697
698 ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
699 p_dev->devname, p_dev->priv);
700 if (!ret)
701 p_dev->_irq = 1;
702
703 return ret;
704 }
705 EXPORT_SYMBOL(pcmcia_request_irq);
706
707
708 #ifdef CONFIG_PCMCIA_PROBE
709
710 /* mask of IRQs already reserved by other cards, we should avoid using them */
711 static u8 pcmcia_used_irq[32];
712
test_action(int cpl,void * dev_id)713 static irqreturn_t test_action(int cpl, void *dev_id)
714 {
715 return IRQ_NONE;
716 }
717
718 /**
719 * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
720 * @p_dev: the associated PCMCIA device
721 * @type: IRQ type (flags)
722 *
723 * locking note: must be called with ops_mutex locked.
724 */
pcmcia_setup_isa_irq(struct pcmcia_device * p_dev,int type)725 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
726 {
727 struct pcmcia_socket *s = p_dev->socket;
728 unsigned int try, irq;
729 u32 mask = s->irq_mask;
730 int ret = -ENODEV;
731
732 for (try = 0; try < 64; try++) {
733 irq = try % 32;
734
735 if (irq > NR_IRQS)
736 continue;
737
738 /* marked as available by driver, not blocked by userspace? */
739 if (!((mask >> irq) & 1))
740 continue;
741
742 /* avoid an IRQ which is already used by another PCMCIA card */
743 if ((try < 32) && pcmcia_used_irq[irq])
744 continue;
745
746 /* register the correct driver, if possible, to check whether
747 * registering a dummy handle works, i.e. if the IRQ isn't
748 * marked as used by the kernel resource management core */
749 ret = request_irq(irq, test_action, type, p_dev->devname,
750 p_dev);
751 if (!ret) {
752 free_irq(irq, p_dev);
753 p_dev->irq = s->pcmcia_irq = irq;
754 pcmcia_used_irq[irq]++;
755 break;
756 }
757 }
758
759 return ret;
760 }
761
pcmcia_cleanup_irq(struct pcmcia_socket * s)762 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
763 {
764 pcmcia_used_irq[s->pcmcia_irq]--;
765 s->pcmcia_irq = 0;
766 }
767
768 #else /* CONFIG_PCMCIA_PROBE */
769
pcmcia_setup_isa_irq(struct pcmcia_device * p_dev,int type)770 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
771 {
772 return -EINVAL;
773 }
774
pcmcia_cleanup_irq(struct pcmcia_socket * s)775 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
776 {
777 s->pcmcia_irq = 0;
778 return;
779 }
780
781 #endif /* CONFIG_PCMCIA_PROBE */
782
783
784 /**
785 * pcmcia_setup_irq() - determine IRQ to be used for device
786 * @p_dev: the associated PCMCIA device
787 *
788 * locking note: must be called with ops_mutex locked.
789 */
pcmcia_setup_irq(struct pcmcia_device * p_dev)790 int pcmcia_setup_irq(struct pcmcia_device *p_dev)
791 {
792 struct pcmcia_socket *s = p_dev->socket;
793
794 if (p_dev->irq)
795 return 0;
796
797 /* already assigned? */
798 if (s->pcmcia_irq) {
799 p_dev->irq = s->pcmcia_irq;
800 return 0;
801 }
802
803 /* prefer an exclusive ISA irq */
804 if (!pcmcia_setup_isa_irq(p_dev, 0))
805 return 0;
806
807 /* but accept a shared ISA irq */
808 if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
809 return 0;
810
811 /* but use the PCI irq otherwise */
812 if (s->pci_irq) {
813 p_dev->irq = s->pcmcia_irq = s->pci_irq;
814 return 0;
815 }
816
817 return -EINVAL;
818 }
819
820
821 /**
822 * pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices
823 * @p_dev: the associated PCMCIA device
824 * @res: &struct resource pointing to p_dev->resource[2..5]
825 * @speed: access speed
826 *
827 * pcmcia_request_window() attepts to reserve an iomem ranges specified in
828 * &struct resource @res pointing to one of the entries in
829 * &struct pcmcia_device @p_dev->resource[2..5]. The "start" value is the
830 * requested start of the IO mem resource; "end" reflects the size
831 * requested.
832 */
pcmcia_request_window(struct pcmcia_device * p_dev,struct resource * res,unsigned int speed)833 int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res,
834 unsigned int speed)
835 {
836 struct pcmcia_socket *s = p_dev->socket;
837 pccard_mem_map *win;
838 u_long align;
839 int w;
840
841 dev_dbg(&p_dev->dev, "request_window %pR %d\n", res, speed);
842
843 if (!(s->state & SOCKET_PRESENT)) {
844 dev_dbg(&p_dev->dev, "No card present\n");
845 return -ENODEV;
846 }
847
848 /* Window size defaults to smallest available */
849 if (res->end == 0)
850 res->end = s->map_size;
851 align = (s->features & SS_CAP_MEM_ALIGN) ? res->end : s->map_size;
852 if (res->end & (s->map_size-1)) {
853 dev_dbg(&p_dev->dev, "invalid map size\n");
854 return -EINVAL;
855 }
856 if ((res->start && (s->features & SS_CAP_STATIC_MAP)) ||
857 (res->start & (align-1))) {
858 dev_dbg(&p_dev->dev, "invalid base address\n");
859 return -EINVAL;
860 }
861 if (res->start)
862 align = 0;
863
864 /* Allocate system memory window */
865 mutex_lock(&s->ops_mutex);
866 for (w = 0; w < MAX_WIN; w++)
867 if (!(s->state & SOCKET_WIN_REQ(w)))
868 break;
869 if (w == MAX_WIN) {
870 dev_dbg(&p_dev->dev, "all windows are used already\n");
871 mutex_unlock(&s->ops_mutex);
872 return -EINVAL;
873 }
874
875 win = &s->win[w];
876
877 if (!(s->features & SS_CAP_STATIC_MAP)) {
878 win->res = pcmcia_find_mem_region(res->start, res->end, align,
879 0, s);
880 if (!win->res) {
881 dev_dbg(&p_dev->dev, "allocating mem region failed\n");
882 mutex_unlock(&s->ops_mutex);
883 return -EINVAL;
884 }
885 }
886 p_dev->_win |= CLIENT_WIN_REQ(w);
887
888 /* Configure the socket controller */
889 win->map = w+1;
890 win->flags = res->flags & WIN_FLAGS_MAP;
891 win->speed = speed;
892 win->card_start = 0;
893
894 if (s->ops->set_mem_map(s, win) != 0) {
895 dev_dbg(&p_dev->dev, "failed to set memory mapping\n");
896 mutex_unlock(&s->ops_mutex);
897 return -EIO;
898 }
899 s->state |= SOCKET_WIN_REQ(w);
900
901 /* Return window handle */
902 if (s->features & SS_CAP_STATIC_MAP)
903 res->start = win->static_start;
904 else
905 res->start = win->res->start;
906
907 /* convert to new-style resources */
908 res->end += res->start - 1;
909 res->flags &= ~WIN_FLAGS_REQ;
910 res->flags |= (win->map << 2) | IORESOURCE_MEM;
911 res->parent = win->res;
912 if (win->res)
913 request_resource(&iomem_resource, res);
914
915 dev_dbg(&p_dev->dev, "request_window results in %pR\n", res);
916
917 mutex_unlock(&s->ops_mutex);
918
919 return 0;
920 } /* pcmcia_request_window */
921 EXPORT_SYMBOL(pcmcia_request_window);
922
923
924 /**
925 * pcmcia_disable_device() - disable and clean up a PCMCIA device
926 * @p_dev: the associated PCMCIA device
927 *
928 * pcmcia_disable_device() is the driver-callable counterpart to
929 * pcmcia_enable_device(): If a PCMCIA device is no longer used,
930 * drivers are expected to clean up and disable the device by calling
931 * this function. Any I/O ranges (iomem and ioports) will be released,
932 * the Vpp voltage will be set to 0, and IRQs will no longer be
933 * generated -- at least if there is no other card function (of
934 * multifunction devices) being used.
935 */
pcmcia_disable_device(struct pcmcia_device * p_dev)936 void pcmcia_disable_device(struct pcmcia_device *p_dev)
937 {
938 int i;
939
940 dev_dbg(&p_dev->dev, "disabling device\n");
941
942 for (i = 0; i < MAX_WIN; i++) {
943 struct resource *res = p_dev->resource[MAX_IO_WIN + i];
944 if (res->flags & WIN_FLAGS_REQ)
945 pcmcia_release_window(p_dev, res);
946 }
947
948 pcmcia_release_configuration(p_dev);
949 pcmcia_release_io(p_dev);
950 if (p_dev->_irq) {
951 free_irq(p_dev->irq, p_dev->priv);
952 p_dev->_irq = 0;
953 }
954 }
955 EXPORT_SYMBOL(pcmcia_disable_device);
956