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() themselfves, 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