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 
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 
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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  */
393 static int pcmcia_release_io(struct pcmcia_device *p_dev)
394 {
395 	struct pcmcia_socket *s = p_dev->socket;
396 	int ret = -EINVAL;
397 	config_t *c;
398 
399 	mutex_lock(&s->ops_mutex);
400 	if (!p_dev->_io)
401 		goto out;
402 
403 	c = p_dev->function_config;
404 
405 	release_io_space(s, &c->io[0]);
406 
407 	if (c->io[1].end)
408 		release_io_space(s, &c->io[1]);
409 
410 	p_dev->_io = 0;
411 	c->state &= ~CONFIG_IO_REQ;
412 
413 out:
414 	mutex_unlock(&s->ops_mutex);
415 
416 	return ret;
417 } /* pcmcia_release_io */
418 
419 
420 /**
421  * pcmcia_release_window() - release reserved iomem for PCMCIA devices
422  * @p_dev: pcmcia device
423  * @res: iomem resource to release
424  *
425  * pcmcia_release_window() releases &struct resource *res which was
426  * previously reserved by calling pcmcia_request_window().
427  */
428 int pcmcia_release_window(struct pcmcia_device *p_dev, struct resource *res)
429 {
430 	struct pcmcia_socket *s = p_dev->socket;
431 	pccard_mem_map *win;
432 	unsigned int w;
433 
434 	dev_dbg(&p_dev->dev, "releasing window %pR\n", res);
435 
436 	w = ((res->flags & IORESOURCE_BITS & WIN_FLAGS_REQ) >> 2) - 1;
437 	if (w >= MAX_WIN)
438 		return -EINVAL;
439 
440 	mutex_lock(&s->ops_mutex);
441 	win = &s->win[w];
442 
443 	if (!(p_dev->_win & CLIENT_WIN_REQ(w))) {
444 		dev_dbg(&p_dev->dev, "not releasing unknown window\n");
445 		mutex_unlock(&s->ops_mutex);
446 		return -EINVAL;
447 	}
448 
449 	/* Shut down memory window */
450 	win->flags &= ~MAP_ACTIVE;
451 	s->ops->set_mem_map(s, win);
452 	s->state &= ~SOCKET_WIN_REQ(w);
453 
454 	/* Release system memory */
455 	if (win->res) {
456 		release_resource(res);
457 		release_resource(win->res);
458 		kfree(win->res);
459 		win->res = NULL;
460 	}
461 	res->start = res->end = 0;
462 	res->flags = IORESOURCE_MEM;
463 	p_dev->_win &= ~CLIENT_WIN_REQ(w);
464 	mutex_unlock(&s->ops_mutex);
465 
466 	return 0;
467 } /* pcmcia_release_window */
468 EXPORT_SYMBOL(pcmcia_release_window);
469 
470 
471 /**
472  * pcmcia_enable_device() - set up and activate a PCMCIA device
473  * @p_dev: the associated PCMCIA device
474  *
475  * pcmcia_enable_device() physically enables a PCMCIA device. It parses
476  * the flags passed to in @flags and stored in @p_dev->flags and sets up
477  * the Vpp voltage, enables the speaker line, I/O ports and store proper
478  * values to configuration registers.
479  */
480 int pcmcia_enable_device(struct pcmcia_device *p_dev)
481 {
482 	int i;
483 	unsigned int base;
484 	struct pcmcia_socket *s = p_dev->socket;
485 	config_t *c;
486 	pccard_io_map iomap;
487 	unsigned char status = 0;
488 	unsigned char ext_status = 0;
489 	unsigned char option = 0;
490 	unsigned int flags = p_dev->config_flags;
491 
492 	if (!(s->state & SOCKET_PRESENT))
493 		return -ENODEV;
494 
495 	mutex_lock(&s->ops_mutex);
496 	c = p_dev->function_config;
497 	if (c->state & CONFIG_LOCKED) {
498 		mutex_unlock(&s->ops_mutex);
499 		dev_dbg(&p_dev->dev, "Configuration is locked\n");
500 		return -EACCES;
501 	}
502 
503 	/* Do power control.  We don't allow changes in Vcc. */
504 	s->socket.Vpp = p_dev->vpp;
505 	if (s->ops->set_socket(s, &s->socket)) {
506 		mutex_unlock(&s->ops_mutex);
507 		dev_warn(&p_dev->dev, "Unable to set socket state\n");
508 		return -EINVAL;
509 	}
510 
511 	/* Pick memory or I/O card, DMA mode, interrupt */
512 	if (p_dev->_io || flags & CONF_ENABLE_IRQ)
513 		flags |= CONF_ENABLE_IOCARD;
514 	if (flags & CONF_ENABLE_IOCARD)
515 		s->socket.flags |= SS_IOCARD;
516 	if (flags & CONF_ENABLE_ZVCARD)
517 		s->socket.flags |= SS_ZVCARD | SS_IOCARD;
518 	if (flags & CONF_ENABLE_SPKR) {
519 		s->socket.flags |= SS_SPKR_ENA;
520 		status = CCSR_AUDIO_ENA;
521 		if (!(p_dev->config_regs & PRESENT_STATUS))
522 			dev_warn(&p_dev->dev, "speaker requested, but "
523 					      "PRESENT_STATUS not set!\n");
524 	}
525 	if (flags & CONF_ENABLE_IRQ)
526 		s->socket.io_irq = s->pcmcia_irq;
527 	else
528 		s->socket.io_irq = 0;
529 	if (flags & CONF_ENABLE_ESR) {
530 		p_dev->config_regs |= PRESENT_EXT_STATUS;
531 		ext_status = ESR_REQ_ATTN_ENA;
532 	}
533 	s->ops->set_socket(s, &s->socket);
534 	s->lock_count++;
535 
536 	dev_dbg(&p_dev->dev,
537 		"enable_device: V %d, flags %x, base %x, regs %x, idx %x\n",
538 		p_dev->vpp, flags, p_dev->config_base, p_dev->config_regs,
539 		p_dev->config_index);
540 
541 	/* Set up CIS configuration registers */
542 	base = p_dev->config_base;
543 	if (p_dev->config_regs & PRESENT_COPY) {
544 		u16 tmp = 0;
545 		dev_dbg(&p_dev->dev, "clearing CISREG_SCR\n");
546 		pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &tmp);
547 	}
548 	if (p_dev->config_regs & PRESENT_PIN_REPLACE) {
549 		u16 tmp = 0;
550 		dev_dbg(&p_dev->dev, "clearing CISREG_PRR\n");
551 		pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &tmp);
552 	}
553 	if (p_dev->config_regs & PRESENT_OPTION) {
554 		if (s->functions == 1) {
555 			option = p_dev->config_index & COR_CONFIG_MASK;
556 		} else {
557 			option = p_dev->config_index & COR_MFC_CONFIG_MASK;
558 			option |= COR_FUNC_ENA|COR_IREQ_ENA;
559 			if (p_dev->config_regs & PRESENT_IOBASE_0)
560 				option |= COR_ADDR_DECODE;
561 		}
562 		if ((flags & CONF_ENABLE_IRQ) &&
563 			!(flags & CONF_ENABLE_PULSE_IRQ))
564 			option |= COR_LEVEL_REQ;
565 		pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &option);
566 		msleep(40);
567 	}
568 	if (p_dev->config_regs & PRESENT_STATUS)
569 		pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &status);
570 
571 	if (p_dev->config_regs & PRESENT_EXT_STATUS)
572 		pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1,
573 					&ext_status);
574 
575 	if (p_dev->config_regs & PRESENT_IOBASE_0) {
576 		u8 b = c->io[0].start & 0xff;
577 		pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
578 		b = (c->io[0].start >> 8) & 0xff;
579 		pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
580 	}
581 	if (p_dev->config_regs & PRESENT_IOSIZE) {
582 		u8 b = resource_size(&c->io[0]) + resource_size(&c->io[1]) - 1;
583 		pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
584 	}
585 
586 	/* Configure I/O windows */
587 	if (c->state & CONFIG_IO_REQ) {
588 		iomap.speed = io_speed;
589 		for (i = 0; i < MAX_IO_WIN; i++)
590 			if (s->io[i].res) {
591 				iomap.map = i;
592 				iomap.flags = MAP_ACTIVE;
593 				switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
594 				case IO_DATA_PATH_WIDTH_16:
595 					iomap.flags |= MAP_16BIT; break;
596 				case IO_DATA_PATH_WIDTH_AUTO:
597 					iomap.flags |= MAP_AUTOSZ; break;
598 				default:
599 					break;
600 				}
601 				iomap.start = s->io[i].res->start;
602 				iomap.stop = s->io[i].res->end;
603 				s->ops->set_io_map(s, &iomap);
604 				s->io[i].Config++;
605 			}
606 	}
607 
608 	c->state |= CONFIG_LOCKED;
609 	p_dev->_locked = 1;
610 	mutex_unlock(&s->ops_mutex);
611 	return 0;
612 } /* pcmcia_enable_device */
613 EXPORT_SYMBOL(pcmcia_enable_device);
614 
615 
616 /**
617  * pcmcia_request_io() - attempt to reserve port ranges for PCMCIA devices
618  * @p_dev: the associated PCMCIA device
619  *
620  * pcmcia_request_io() attempts to reserve the IO port ranges specified in
621  * &struct pcmcia_device @p_dev->resource[0] and @p_dev->resource[1]. The
622  * "start" value is the requested start of the IO port resource; "end"
623  * reflects the number of ports requested. The number of IO lines requested
624  * is specified in &struct pcmcia_device @p_dev->io_lines.
625  */
626 int pcmcia_request_io(struct pcmcia_device *p_dev)
627 {
628 	struct pcmcia_socket *s = p_dev->socket;
629 	config_t *c = p_dev->function_config;
630 	int ret = -EINVAL;
631 
632 	mutex_lock(&s->ops_mutex);
633 	dev_dbg(&p_dev->dev, "pcmcia_request_io: %pR , %pR",
634 		&c->io[0], &c->io[1]);
635 
636 	if (!(s->state & SOCKET_PRESENT)) {
637 		dev_dbg(&p_dev->dev, "pcmcia_request_io: No card present\n");
638 		goto out;
639 	}
640 
641 	if (c->state & CONFIG_LOCKED) {
642 		dev_dbg(&p_dev->dev, "Configuration is locked\n");
643 		goto out;
644 	}
645 	if (c->state & CONFIG_IO_REQ) {
646 		dev_dbg(&p_dev->dev, "IO already configured\n");
647 		goto out;
648 	}
649 
650 	ret = alloc_io_space(s, &c->io[0], p_dev->io_lines);
651 	if (ret)
652 		goto out;
653 
654 	if (c->io[1].end) {
655 		ret = alloc_io_space(s, &c->io[1], p_dev->io_lines);
656 		if (ret) {
657 			struct resource tmp = c->io[0];
658 			/* release the previously allocated resource */
659 			release_io_space(s, &c->io[0]);
660 			/* but preserve the settings, for they worked... */
661 			c->io[0].end = resource_size(&tmp);
662 			c->io[0].start = tmp.start;
663 			c->io[0].flags = tmp.flags;
664 			goto out;
665 		}
666 	} else
667 		c->io[1].start = 0;
668 
669 	c->state |= CONFIG_IO_REQ;
670 	p_dev->_io = 1;
671 
672 	dev_dbg(&p_dev->dev, "pcmcia_request_io succeeded: %pR , %pR",
673 		&c->io[0], &c->io[1]);
674 out:
675 	mutex_unlock(&s->ops_mutex);
676 
677 	return ret;
678 } /* pcmcia_request_io */
679 EXPORT_SYMBOL(pcmcia_request_io);
680 
681 
682 /**
683  * pcmcia_request_irq() - attempt to request a IRQ for a PCMCIA device
684  * @p_dev: the associated PCMCIA device
685  * @handler: IRQ handler to register
686  *
687  * pcmcia_request_irq() is a wrapper around request_irq() which allows
688  * the PCMCIA core to clean up the registration in pcmcia_disable_device().
689  * Drivers are free to use request_irq() directly, but then they need to
690  * call free_irq() themselfves, too. Also, only %IRQF_SHARED capable IRQ
691  * handlers are allowed.
692  */
693 int __must_check pcmcia_request_irq(struct pcmcia_device *p_dev,
694 				    irq_handler_t handler)
695 {
696 	int ret;
697 
698 	if (!p_dev->irq)
699 		return -EINVAL;
700 
701 	ret = request_irq(p_dev->irq, handler, IRQF_SHARED,
702 			p_dev->devname, p_dev->priv);
703 	if (!ret)
704 		p_dev->_irq = 1;
705 
706 	return ret;
707 }
708 EXPORT_SYMBOL(pcmcia_request_irq);
709 
710 
711 #ifdef CONFIG_PCMCIA_PROBE
712 
713 /* mask of IRQs already reserved by other cards, we should avoid using them */
714 static u8 pcmcia_used_irq[32];
715 
716 static irqreturn_t test_action(int cpl, void *dev_id)
717 {
718 	return IRQ_NONE;
719 }
720 
721 /**
722  * pcmcia_setup_isa_irq() - determine whether an ISA IRQ can be used
723  * @p_dev: the associated PCMCIA device
724  * @type:  IRQ type (flags)
725  *
726  * locking note: must be called with ops_mutex locked.
727  */
728 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
729 {
730 	struct pcmcia_socket *s = p_dev->socket;
731 	unsigned int try, irq;
732 	u32 mask = s->irq_mask;
733 	int ret = -ENODEV;
734 
735 	for (try = 0; try < 64; try++) {
736 		irq = try % 32;
737 
738 		if (irq > NR_IRQS)
739 			continue;
740 
741 		/* marked as available by driver, not blocked by userspace? */
742 		if (!((mask >> irq) & 1))
743 			continue;
744 
745 		/* avoid an IRQ which is already used by another PCMCIA card */
746 		if ((try < 32) && pcmcia_used_irq[irq])
747 			continue;
748 
749 		/* register the correct driver, if possible, to check whether
750 		 * registering a dummy handle works, i.e. if the IRQ isn't
751 		 * marked as used by the kernel resource management core */
752 		ret = request_irq(irq, test_action, type, p_dev->devname,
753 				  p_dev);
754 		if (!ret) {
755 			free_irq(irq, p_dev);
756 			p_dev->irq = s->pcmcia_irq = irq;
757 			pcmcia_used_irq[irq]++;
758 			break;
759 		}
760 	}
761 
762 	return ret;
763 }
764 
765 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
766 {
767 	pcmcia_used_irq[s->pcmcia_irq]--;
768 	s->pcmcia_irq = 0;
769 }
770 
771 #else /* CONFIG_PCMCIA_PROBE */
772 
773 static int pcmcia_setup_isa_irq(struct pcmcia_device *p_dev, int type)
774 {
775 	return -EINVAL;
776 }
777 
778 void pcmcia_cleanup_irq(struct pcmcia_socket *s)
779 {
780 	s->pcmcia_irq = 0;
781 	return;
782 }
783 
784 #endif  /* CONFIG_PCMCIA_PROBE */
785 
786 
787 /**
788  * pcmcia_setup_irq() - determine IRQ to be used for device
789  * @p_dev: the associated PCMCIA device
790  *
791  * locking note: must be called with ops_mutex locked.
792  */
793 int pcmcia_setup_irq(struct pcmcia_device *p_dev)
794 {
795 	struct pcmcia_socket *s = p_dev->socket;
796 
797 	if (p_dev->irq)
798 		return 0;
799 
800 	/* already assigned? */
801 	if (s->pcmcia_irq) {
802 		p_dev->irq = s->pcmcia_irq;
803 		return 0;
804 	}
805 
806 	/* prefer an exclusive ISA irq */
807 	if (!pcmcia_setup_isa_irq(p_dev, 0))
808 		return 0;
809 
810 	/* but accept a shared ISA irq */
811 	if (!pcmcia_setup_isa_irq(p_dev, IRQF_SHARED))
812 		return 0;
813 
814 	/* but use the PCI irq otherwise */
815 	if (s->pci_irq) {
816 		p_dev->irq = s->pcmcia_irq = s->pci_irq;
817 		return 0;
818 	}
819 
820 	return -EINVAL;
821 }
822 
823 
824 /**
825  * pcmcia_request_window() - attempt to reserve iomem for PCMCIA devices
826  * @p_dev: the associated PCMCIA device
827  * @res: &struct resource pointing to p_dev->resource[2..5]
828  * @speed: access speed
829  *
830  * pcmcia_request_window() attepts to reserve an iomem ranges specified in
831  * &struct resource @res pointing to one of the entries in
832  * &struct pcmcia_device @p_dev->resource[2..5]. The "start" value is the
833  * requested start of the IO mem resource; "end" reflects the size
834  * requested.
835  */
836 int pcmcia_request_window(struct pcmcia_device *p_dev, struct resource *res,
837 			unsigned int speed)
838 {
839 	struct pcmcia_socket *s = p_dev->socket;
840 	pccard_mem_map *win;
841 	u_long align;
842 	int w;
843 
844 	dev_dbg(&p_dev->dev, "request_window %pR %d\n", res, speed);
845 
846 	if (!(s->state & SOCKET_PRESENT)) {
847 		dev_dbg(&p_dev->dev, "No card present\n");
848 		return -ENODEV;
849 	}
850 
851 	/* Window size defaults to smallest available */
852 	if (res->end == 0)
853 		res->end = s->map_size;
854 	align = (s->features & SS_CAP_MEM_ALIGN) ? res->end : s->map_size;
855 	if (res->end & (s->map_size-1)) {
856 		dev_dbg(&p_dev->dev, "invalid map size\n");
857 		return -EINVAL;
858 	}
859 	if ((res->start && (s->features & SS_CAP_STATIC_MAP)) ||
860 	    (res->start & (align-1))) {
861 		dev_dbg(&p_dev->dev, "invalid base address\n");
862 		return -EINVAL;
863 	}
864 	if (res->start)
865 		align = 0;
866 
867 	/* Allocate system memory window */
868 	mutex_lock(&s->ops_mutex);
869 	for (w = 0; w < MAX_WIN; w++)
870 		if (!(s->state & SOCKET_WIN_REQ(w)))
871 			break;
872 	if (w == MAX_WIN) {
873 		dev_dbg(&p_dev->dev, "all windows are used already\n");
874 		mutex_unlock(&s->ops_mutex);
875 		return -EINVAL;
876 	}
877 
878 	win = &s->win[w];
879 
880 	if (!(s->features & SS_CAP_STATIC_MAP)) {
881 		win->res = pcmcia_find_mem_region(res->start, res->end, align,
882 						0, s);
883 		if (!win->res) {
884 			dev_dbg(&p_dev->dev, "allocating mem region failed\n");
885 			mutex_unlock(&s->ops_mutex);
886 			return -EINVAL;
887 		}
888 	}
889 	p_dev->_win |= CLIENT_WIN_REQ(w);
890 
891 	/* Configure the socket controller */
892 	win->map = w+1;
893 	win->flags = res->flags & WIN_FLAGS_MAP;
894 	win->speed = speed;
895 	win->card_start = 0;
896 
897 	if (s->ops->set_mem_map(s, win) != 0) {
898 		dev_dbg(&p_dev->dev, "failed to set memory mapping\n");
899 		mutex_unlock(&s->ops_mutex);
900 		return -EIO;
901 	}
902 	s->state |= SOCKET_WIN_REQ(w);
903 
904 	/* Return window handle */
905 	if (s->features & SS_CAP_STATIC_MAP)
906 		res->start = win->static_start;
907 	else
908 		res->start = win->res->start;
909 
910 	/* convert to new-style resources */
911 	res->end += res->start - 1;
912 	res->flags &= ~WIN_FLAGS_REQ;
913 	res->flags |= (win->map << 2) | IORESOURCE_MEM;
914 	res->parent = win->res;
915 	if (win->res)
916 		request_resource(&iomem_resource, res);
917 
918 	dev_dbg(&p_dev->dev, "request_window results in %pR\n", res);
919 
920 	mutex_unlock(&s->ops_mutex);
921 
922 	return 0;
923 } /* pcmcia_request_window */
924 EXPORT_SYMBOL(pcmcia_request_window);
925 
926 
927 /**
928  * pcmcia_disable_device() - disable and clean up a PCMCIA device
929  * @p_dev: the associated PCMCIA device
930  *
931  * pcmcia_disable_device() is the driver-callable counterpart to
932  * pcmcia_enable_device(): If a PCMCIA device is no longer used,
933  * drivers are expected to clean up and disable the device by calling
934  * this function. Any I/O ranges (iomem and ioports) will be released,
935  * the Vpp voltage will be set to 0, and IRQs will no longer be
936  * generated -- at least if there is no other card function (of
937  * multifunction devices) being used.
938  */
939 void pcmcia_disable_device(struct pcmcia_device *p_dev)
940 {
941 	int i;
942 
943 	dev_dbg(&p_dev->dev, "disabling device\n");
944 
945 	for (i = 0; i < MAX_WIN; i++) {
946 		struct resource *res = p_dev->resource[MAX_IO_WIN + i];
947 		if (res->flags & WIN_FLAGS_REQ)
948 			pcmcia_release_window(p_dev, res);
949 	}
950 
951 	pcmcia_release_configuration(p_dev);
952 	pcmcia_release_io(p_dev);
953 	if (p_dev->_irq) {
954 		free_irq(p_dev->irq, p_dev->priv);
955 		p_dev->_irq = 0;
956 	}
957 }
958 EXPORT_SYMBOL(pcmcia_disable_device);
959