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 */
37 static int io_speed;
38 module_param(io_speed, int, 0444);
39 
40 
41 int 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 
49 struct 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  */
64 static 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  */
100 static 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  */
159 static 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  */
197 int 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 }
201 EXPORT_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  */
210 int 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 }
214 EXPORT_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  */
227 int 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 }
246 EXPORT_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  */
257 int 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 	}
290 unlock:
291 	mutex_unlock(&s->ops_mutex);
292 
293 	return ret;
294 }
295 EXPORT_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  */
307 int 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 
331 unlock:
332 	mutex_unlock(&s->ops_mutex);
333 
334 	return ret;
335 }
336 EXPORT_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  */
350 int 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  */
397 static 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 
417 out:
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  */
432 int 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 */
472 EXPORT_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  */
484 int 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 */
617 EXPORT_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  */
630 int 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]);
678 out:
679 	mutex_unlock(&s->ops_mutex);
680 
681 	return ret;
682 } /* pcmcia_request_io */
683 EXPORT_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  */
697 int __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 }
712 EXPORT_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 */
718 static u8 pcmcia_used_irq[32];
719 
720 static 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  */
731 static 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 
768 void 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 
776 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
777 {
778 	return -EINVAL;
779 }
780 
781 void 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  */
796 int 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  */
839 int 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 */
927 EXPORT_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  */
942 void 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 }
961 EXPORT_SYMBOL(pcmcia_disable_device);
962