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PCI: do not initialize bridges more than once
[linux-2.6/mini2440.git] / drivers / pcmcia / pcmcia_resource.c
blobf5d0ba8e22d5473fb46e00bfbe5e3bfe2e7719a9
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) 2004-2005 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
24 #include <pcmcia/cs_types.h>
25 #include <pcmcia/ss.h>
26 #include <pcmcia/cs.h>
27 #include <pcmcia/cistpl.h>
28 #include <pcmcia/cisreg.h>
29 #include <pcmcia/ds.h>
30
31 #include "cs_internal.h"
32
33
34 /* Access speed for IO windows */
35 static int io_speed = 0;
36 module_param(io_speed, int, 0444);
37
38
39 #ifdef CONFIG_PCMCIA_PROBE
40 #include <asm/irq.h>
41 /* mask of IRQs already reserved by other cards, we should avoid using them */
42 static u8 pcmcia_used_irq[NR_IRQS];
43 #endif
44
45
46 #ifdef CONFIG_PCMCIA_DEBUG
47 extern int ds_pc_debug;
48
49 #define ds_dbg(skt, lvl, fmt, arg...) do { \
50 if (ds_pc_debug >= lvl) \
51 dev_printk(KERN_DEBUG, &skt->dev, \
52 "pcmcia_resource: " fmt, \
53 ## arg); \
54 } while (0)
55 #else
56 #define ds_dbg(skt, lvl, fmt, arg...) do { } while (0)
57 #endif
58
59
60
61 /** alloc_io_space
62 *
63 * Special stuff for managing IO windows, because they are scarce
64 */
65
66 static int alloc_io_space(struct pcmcia_socket *s, u_int attr,
67 unsigned int *base, unsigned int num, u_int lines)
68 {
69 int i;
70 unsigned int try, align;
71
72 align = (*base) ? (lines ? 1<<lines : 0) : 1;
73 if (align && (align < num)) {
74 if (*base) {
75 ds_dbg(s, 0, "odd IO request: num %#x align %#x\n",
76 num, align);
77 align = 0;
78 } else
79 while (align && (align < num)) align <<= 1;
80 }
81 if (*base & ~(align-1)) {
82 ds_dbg(s, 0, "odd IO request: base %#x align %#x\n",
83 *base, align);
84 align = 0;
85 }
86 if ((s->features & SS_CAP_STATIC_MAP) && s->io_offset) {
87 *base = s->io_offset | (*base & 0x0fff);
88 return 0;
89 }
90 /* Check for an already-allocated window that must conflict with
91 * what was asked for. It is a hack because it does not catch all
92 * potential conflicts, just the most obvious ones.
93 */
94 for (i = 0; i < MAX_IO_WIN; i++)
95 if ((s->io[i].res) && *base &&
96 ((s->io[i].res->start & (align-1)) == *base))
97 return 1;
98 for (i = 0; i < MAX_IO_WIN; i++) {
99 if (!s->io[i].res) {
100 s->io[i].res = pcmcia_find_io_region(*base, num, align, s);
101 if (s->io[i].res) {
102 *base = s->io[i].res->start;
103 s->io[i].res->flags = (s->io[i].res->flags & ~IORESOURCE_BITS) | (attr & IORESOURCE_BITS);
104 s->io[i].InUse = num;
105 break;
106 } else
107 return 1;
108 } else if ((s->io[i].res->flags & IORESOURCE_BITS) != (attr & IORESOURCE_BITS))
109 continue;
110 /* Try to extend top of window */
111 try = s->io[i].res->end + 1;
112 if ((*base == 0) || (*base == try))
113 if (pcmcia_adjust_io_region(s->io[i].res, s->io[i].res->start,
114 s->io[i].res->end + num, s) == 0) {
115 *base = try;
116 s->io[i].InUse += num;
117 break;
118 }
119 /* Try to extend bottom of window */
120 try = s->io[i].res->start - num;
121 if ((*base == 0) || (*base == try))
122 if (pcmcia_adjust_io_region(s->io[i].res, s->io[i].res->start - num,
123 s->io[i].res->end, s) == 0) {
124 *base = try;
125 s->io[i].InUse += num;
126 break;
127 }
128 }
129 return (i == MAX_IO_WIN);
130 } /* alloc_io_space */
131
132
133 static void release_io_space(struct pcmcia_socket *s, unsigned int base,
134 unsigned int num)
135 {
136 int i;
137
138 for (i = 0; i < MAX_IO_WIN; i++) {
139 if (!s->io[i].res)
140 continue;
141 if ((s->io[i].res->start <= base) &&
142 (s->io[i].res->end >= base+num-1)) {
143 s->io[i].InUse -= num;
144 /* Free the window if no one else is using it */
145 if (s->io[i].InUse == 0) {
146 release_resource(s->io[i].res);
147 kfree(s->io[i].res);
148 s->io[i].res = NULL;
149 }
150 }
151 }
152 } /* release_io_space */
153
154
155 /** pccard_access_configuration_register
156 *
157 * Access_configuration_register() reads and writes configuration
158 * registers in attribute memory. Memory window 0 is reserved for
159 * this and the tuple reading services.
160 */
161
162 int pcmcia_access_configuration_register(struct pcmcia_device *p_dev,
163 conf_reg_t *reg)
164 {
165 struct pcmcia_socket *s;
166 config_t *c;
167 int addr;
168 u_char val;
169
170 if (!p_dev || !p_dev->function_config)
171 return -EINVAL;
172
173 s = p_dev->socket;
174 c = p_dev->function_config;
175
176 if (!(c->state & CONFIG_LOCKED))
177 return -EACCES;
178
179 addr = (c->ConfigBase + reg->Offset) >> 1;
180
181 switch (reg->Action) {
182 case CS_READ:
183 pcmcia_read_cis_mem(s, 1, addr, 1, &val);
184 reg->Value = val;
185 break;
186 case CS_WRITE:
187 val = reg->Value;
188 pcmcia_write_cis_mem(s, 1, addr, 1, &val);
189 break;
190 default:
191 return -EINVAL;
192 break;
193 }
194 return 0;
195 } /* pcmcia_access_configuration_register */
196 EXPORT_SYMBOL(pcmcia_access_configuration_register);
197
198
199 /** pcmcia_get_window
200 */
201 int pcmcia_get_window(struct pcmcia_socket *s, window_handle_t *handle,
202 int idx, win_req_t *req)
203 {
204 window_t *win;
205 int w;
206
207 if (!s || !(s->state & SOCKET_PRESENT))
208 return -ENODEV;
209 for (w = idx; w < MAX_WIN; w++)
210 if (s->state & SOCKET_WIN_REQ(w))
211 break;
212 if (w == MAX_WIN)
213 return -EINVAL;
214 win = &s->win[w];
215 req->Base = win->ctl.res->start;
216 req->Size = win->ctl.res->end - win->ctl.res->start + 1;
217 req->AccessSpeed = win->ctl.speed;
218 req->Attributes = 0;
219 if (win->ctl.flags & MAP_ATTRIB)
220 req->Attributes |= WIN_MEMORY_TYPE_AM;
221 if (win->ctl.flags & MAP_ACTIVE)
222 req->Attributes |= WIN_ENABLE;
223 if (win->ctl.flags & MAP_16BIT)
224 req->Attributes |= WIN_DATA_WIDTH_16;
225 if (win->ctl.flags & MAP_USE_WAIT)
226 req->Attributes |= WIN_USE_WAIT;
227 *handle = win;
228 return 0;
229 } /* pcmcia_get_window */
230 EXPORT_SYMBOL(pcmcia_get_window);
231
232
233 /** pcmcia_get_mem_page
234 *
235 * Change the card address of an already open memory window.
236 */
237 int pcmcia_get_mem_page(window_handle_t win, memreq_t *req)
238 {
239 if ((win == NULL) || (win->magic != WINDOW_MAGIC))
240 return -EINVAL;
241 req->Page = 0;
242 req->CardOffset = win->ctl.card_start;
243 return 0;
244 } /* pcmcia_get_mem_page */
245 EXPORT_SYMBOL(pcmcia_get_mem_page);
246
247
248 int pcmcia_map_mem_page(window_handle_t win, memreq_t *req)
249 {
250 struct pcmcia_socket *s;
251 if ((win == NULL) || (win->magic != WINDOW_MAGIC))
252 return -EINVAL;
253 s = win->sock;
254 if (req->Page != 0) {
255 ds_dbg(s, 0, "failure: requested page is zero\n");
256 return -EINVAL;
257 }
258 win->ctl.card_start = req->CardOffset;
259 if (s->ops->set_mem_map(s, &win->ctl) != 0) {
260 ds_dbg(s, 0, "failed to set_mem_map\n");
261 return -EIO;
262 }
263 return 0;
264 } /* pcmcia_map_mem_page */
265 EXPORT_SYMBOL(pcmcia_map_mem_page);
266
267
268 /** pcmcia_modify_configuration
269 *
270 * Modify a locked socket configuration
271 */
272 int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
273 modconf_t *mod)
274 {
275 struct pcmcia_socket *s;
276 config_t *c;
277
278 s = p_dev->socket;
279 c = p_dev->function_config;
280
281 if (!(s->state & SOCKET_PRESENT))
282 return -ENODEV;
283 if (!(c->state & CONFIG_LOCKED))
284 return -EACCES;
285
286 if (mod->Attributes & CONF_IRQ_CHANGE_VALID) {
287 if (mod->Attributes & CONF_ENABLE_IRQ) {
288 c->Attributes |= CONF_ENABLE_IRQ;
289 s->socket.io_irq = s->irq.AssignedIRQ;
290 } else {
291 c->Attributes &= ~CONF_ENABLE_IRQ;
292 s->socket.io_irq = 0;
293 }
294 s->ops->set_socket(s, &s->socket);
295 }
296
297 if (mod->Attributes & CONF_VCC_CHANGE_VALID) {
298 ds_dbg(s, 0, "changing Vcc is not allowed at this time\n");
299 return -EINVAL;
300 }
301
302 /* We only allow changing Vpp1 and Vpp2 to the same value */
303 if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) &&
304 (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
305 if (mod->Vpp1 != mod->Vpp2) {
306 ds_dbg(s, 0, "Vpp1 and Vpp2 must be the same\n");
307 return -EINVAL;
308 }
309 s->socket.Vpp = mod->Vpp1;
310 if (s->ops->set_socket(s, &s->socket)) {
311 dev_printk(KERN_WARNING, &s->dev,
312 "Unable to set VPP\n");
313 return -EIO;
314 }
315 } else if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) ||
316 (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
317 ds_dbg(s, 0, "changing Vcc is not allowed at this time\n");
318 return -EINVAL;
319 }
320
321 if (mod->Attributes & CONF_IO_CHANGE_WIDTH) {
322 pccard_io_map io_off = { 0, 0, 0, 0, 1 };
323 pccard_io_map io_on;
324 int i;
325
326 io_on.speed = io_speed;
327 for (i = 0; i < MAX_IO_WIN; i++) {
328 if (!s->io[i].res)
329 continue;
330 io_off.map = i;
331 io_on.map = i;
332
333 io_on.flags = MAP_ACTIVE | IO_DATA_PATH_WIDTH_8;
334 io_on.start = s->io[i].res->start;
335 io_on.stop = s->io[i].res->end;
336
337 s->ops->set_io_map(s, &io_off);
338 mdelay(40);
339 s->ops->set_io_map(s, &io_on);
340 }
341 }
342
343 return 0;
344 } /* modify_configuration */
345 EXPORT_SYMBOL(pcmcia_modify_configuration);
346
347
348 int pcmcia_release_configuration(struct pcmcia_device *p_dev)
349 {
350 pccard_io_map io = { 0, 0, 0, 0, 1 };
351 struct pcmcia_socket *s = p_dev->socket;
352 config_t *c = p_dev->function_config;
353 int i;
354
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
378 return 0;
379 } /* pcmcia_release_configuration */
380
381
382 /** pcmcia_release_io
383 *
384 * Release_io() releases the I/O ranges allocated by a client. This
385 * may be invoked some time after a card ejection has already dumped
386 * the actual socket configuration, so if the client is "stale", we
387 * don't bother checking the port ranges against the current socket
388 * values.
389 */
390 static int pcmcia_release_io(struct pcmcia_device *p_dev, io_req_t *req)
391 {
392 struct pcmcia_socket *s = p_dev->socket;
393 config_t *c = p_dev->function_config;
394
395 if (!p_dev->_io )
396 return -EINVAL;
397
398 p_dev->_io = 0;
399
400 if ((c->io.BasePort1 != req->BasePort1) ||
401 (c->io.NumPorts1 != req->NumPorts1) ||
402 (c->io.BasePort2 != req->BasePort2) ||
403 (c->io.NumPorts2 != req->NumPorts2))
404 return -EINVAL;
405
406 c->state &= ~CONFIG_IO_REQ;
407
408 release_io_space(s, req->BasePort1, req->NumPorts1);
409 if (req->NumPorts2)
410 release_io_space(s, req->BasePort2, req->NumPorts2);
411
412 return 0;
413 } /* pcmcia_release_io */
414
415
416 static int pcmcia_release_irq(struct pcmcia_device *p_dev, irq_req_t *req)
417 {
418 struct pcmcia_socket *s = p_dev->socket;
419 config_t *c= p_dev->function_config;
420
421 if (!p_dev->_irq)
422 return -EINVAL;
423 p_dev->_irq = 0;
424
425 if (c->state & CONFIG_LOCKED)
426 return -EACCES;
427 if (c->irq.Attributes != req->Attributes) {
428 ds_dbg(s, 0, "IRQ attributes must match assigned ones\n");
429 return -EINVAL;
430 }
431 if (s->irq.AssignedIRQ != req->AssignedIRQ) {
432 ds_dbg(s, 0, "IRQ must match assigned one\n");
433 return -EINVAL;
434 }
435 if (--s->irq.Config == 0) {
436 c->state &= ~CONFIG_IRQ_REQ;
437 s->irq.AssignedIRQ = 0;
438 }
439
440 if (req->Attributes & IRQ_HANDLE_PRESENT) {
441 free_irq(req->AssignedIRQ, req->Instance);
442 }
443
444 #ifdef CONFIG_PCMCIA_PROBE
445 pcmcia_used_irq[req->AssignedIRQ]--;
446 #endif
447
448 return 0;
449 } /* pcmcia_release_irq */
450
451
452 int pcmcia_release_window(window_handle_t win)
453 {
454 struct pcmcia_socket *s;
455
456 if ((win == NULL) || (win->magic != WINDOW_MAGIC))
457 return -EINVAL;
458 s = win->sock;
459 if (!(win->handle->_win & CLIENT_WIN_REQ(win->index)))
460 return -EINVAL;
461
462 /* Shut down memory window */
463 win->ctl.flags &= ~MAP_ACTIVE;
464 s->ops->set_mem_map(s, &win->ctl);
465 s->state &= ~SOCKET_WIN_REQ(win->index);
466
467 /* Release system memory */
468 if (win->ctl.res) {
469 release_resource(win->ctl.res);
470 kfree(win->ctl.res);
471 win->ctl.res = NULL;
472 }
473 win->handle->_win &= ~CLIENT_WIN_REQ(win->index);
474
475 win->magic = 0;
476
477 return 0;
478 } /* pcmcia_release_window */
479 EXPORT_SYMBOL(pcmcia_release_window);
480
481
482 int pcmcia_request_configuration(struct pcmcia_device *p_dev,
483 config_req_t *req)
484 {
485 int i;
486 u_int base;
487 struct pcmcia_socket *s = p_dev->socket;
488 config_t *c;
489 pccard_io_map iomap;
490
491 if (!(s->state & SOCKET_PRESENT))
492 return -ENODEV;;
493
494 if (req->IntType & INT_CARDBUS) {
495 ds_dbg(p_dev->socket, 0, "IntType may not be INT_CARDBUS\n");
496 return -EINVAL;
497 }
498 c = p_dev->function_config;
499 if (c->state & CONFIG_LOCKED)
500 return -EACCES;
501
502 /* Do power control. We don't allow changes in Vcc. */
503 s->socket.Vpp = req->Vpp;
504 if (s->ops->set_socket(s, &s->socket)) {
505 dev_printk(KERN_WARNING, &s->dev,
506 "Unable to set socket state\n");
507 return -EINVAL;
508 }
509
510 /* Pick memory or I/O card, DMA mode, interrupt */
511 c->IntType = req->IntType;
512 c->Attributes = req->Attributes;
513 if (req->IntType & INT_MEMORY_AND_IO)
514 s->socket.flags |= SS_IOCARD;
515 if (req->IntType & INT_ZOOMED_VIDEO)
516 s->socket.flags |= SS_ZVCARD | SS_IOCARD;
517 if (req->Attributes & CONF_ENABLE_DMA)
518 s->socket.flags |= SS_DMA_MODE;
519 if (req->Attributes & CONF_ENABLE_SPKR)
520 s->socket.flags |= SS_SPKR_ENA;
521 if (req->Attributes & CONF_ENABLE_IRQ)
522 s->socket.io_irq = s->irq.AssignedIRQ;
523 else
524 s->socket.io_irq = 0;
525 s->ops->set_socket(s, &s->socket);
526 s->lock_count++;
527
528 /* Set up CIS configuration registers */
529 base = c->ConfigBase = req->ConfigBase;
530 c->CardValues = req->Present;
531 if (req->Present & PRESENT_COPY) {
532 c->Copy = req->Copy;
533 pcmcia_write_cis_mem(s, 1, (base + CISREG_SCR)>>1, 1, &c->Copy);
534 }
535 if (req->Present & PRESENT_OPTION) {
536 if (s->functions == 1) {
537 c->Option = req->ConfigIndex & COR_CONFIG_MASK;
538 } else {
539 c->Option = req->ConfigIndex & COR_MFC_CONFIG_MASK;
540 c->Option |= COR_FUNC_ENA|COR_IREQ_ENA;
541 if (req->Present & PRESENT_IOBASE_0)
542 c->Option |= COR_ADDR_DECODE;
543 }
544 if (c->state & CONFIG_IRQ_REQ)
545 if (!(c->irq.Attributes & IRQ_FORCED_PULSE))
546 c->Option |= COR_LEVEL_REQ;
547 pcmcia_write_cis_mem(s, 1, (base + CISREG_COR)>>1, 1, &c->Option);
548 mdelay(40);
549 }
550 if (req->Present & PRESENT_STATUS) {
551 c->Status = req->Status;
552 pcmcia_write_cis_mem(s, 1, (base + CISREG_CCSR)>>1, 1, &c->Status);
553 }
554 if (req->Present & PRESENT_PIN_REPLACE) {
555 c->Pin = req->Pin;
556 pcmcia_write_cis_mem(s, 1, (base + CISREG_PRR)>>1, 1, &c->Pin);
557 }
558 if (req->Present & PRESENT_EXT_STATUS) {
559 c->ExtStatus = req->ExtStatus;
560 pcmcia_write_cis_mem(s, 1, (base + CISREG_ESR)>>1, 1, &c->ExtStatus);
561 }
562 if (req->Present & PRESENT_IOBASE_0) {
563 u_char b = c->io.BasePort1 & 0xff;
564 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_0)>>1, 1, &b);
565 b = (c->io.BasePort1 >> 8) & 0xff;
566 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOBASE_1)>>1, 1, &b);
567 }
568 if (req->Present & PRESENT_IOSIZE) {
569 u_char b = c->io.NumPorts1 + c->io.NumPorts2 - 1;
570 pcmcia_write_cis_mem(s, 1, (base + CISREG_IOSIZE)>>1, 1, &b);
571 }
572
573 /* Configure I/O windows */
574 if (c->state & CONFIG_IO_REQ) {
575 iomap.speed = io_speed;
576 for (i = 0; i < MAX_IO_WIN; i++)
577 if (s->io[i].res) {
578 iomap.map = i;
579 iomap.flags = MAP_ACTIVE;
580 switch (s->io[i].res->flags & IO_DATA_PATH_WIDTH) {
581 case IO_DATA_PATH_WIDTH_16:
582 iomap.flags |= MAP_16BIT; break;
583 case IO_DATA_PATH_WIDTH_AUTO:
584 iomap.flags |= MAP_AUTOSZ; break;
585 default:
586 break;
587 }
588 iomap.start = s->io[i].res->start;
589 iomap.stop = s->io[i].res->end;
590 s->ops->set_io_map(s, &iomap);
591 s->io[i].Config++;
592 }
593 }
594
595 c->state |= CONFIG_LOCKED;
596 p_dev->_locked = 1;
597 return 0;
598 } /* pcmcia_request_configuration */
599 EXPORT_SYMBOL(pcmcia_request_configuration);
600
601
602 /** pcmcia_request_io
603 *
604 * Request_io() reserves ranges of port addresses for a socket.
605 * I have not implemented range sharing or alias addressing.
606 */
607 int pcmcia_request_io(struct pcmcia_device *p_dev, io_req_t *req)
608 {
609 struct pcmcia_socket *s = p_dev->socket;
610 config_t *c;
611
612 if (!(s->state & SOCKET_PRESENT))
613 return -ENODEV;
614
615 if (!req)
616 return -EINVAL;
617 c = p_dev->function_config;
618 if (c->state & CONFIG_LOCKED)
619 return -EACCES;
620 if (c->state & CONFIG_IO_REQ) {
621 ds_dbg(s, 0, "IO already configured\n");
622 return -EBUSY;
623 }
624 if (req->Attributes1 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS)) {
625 ds_dbg(s, 0, "bad attribute setting for IO region 1\n");
626 return -EINVAL;
627 }
628 if ((req->NumPorts2 > 0) &&
629 (req->Attributes2 & (IO_SHARED | IO_FORCE_ALIAS_ACCESS))) {
630 ds_dbg(s, 0, "bad attribute setting for IO region 2\n");
631 return -EINVAL;
632 }
633
634 ds_dbg(s, 1, "trying to allocate resource 1\n");
635 if (alloc_io_space(s, req->Attributes1, &req->BasePort1,
636 req->NumPorts1, req->IOAddrLines)) {
637 ds_dbg(s, 0, "allocation of resource 1 failed\n");
638 return -EBUSY;
639 }
640
641 if (req->NumPorts2) {
642 ds_dbg(s, 1, "trying to allocate resource 2\n");
643 if (alloc_io_space(s, req->Attributes2, &req->BasePort2,
644 req->NumPorts2, req->IOAddrLines)) {
645 ds_dbg(s, 0, "allocation of resource 2 failed\n");
646 release_io_space(s, req->BasePort1, req->NumPorts1);
647 return -EBUSY;
648 }
649 }
650
651 c->io = *req;
652 c->state |= CONFIG_IO_REQ;
653 p_dev->_io = 1;
654 return 0;
655 } /* pcmcia_request_io */
656 EXPORT_SYMBOL(pcmcia_request_io);
657
658
659 /** pcmcia_request_irq
660 *
661 * Request_irq() reserves an irq for this client.
662 *
663 * Also, since Linux only reserves irq's when they are actually
664 * hooked, we don't guarantee that an irq will still be available
665 * when the configuration is locked. Now that I think about it,
666 * there might be a way to fix this using a dummy handler.
667 */
668
669 #ifdef CONFIG_PCMCIA_PROBE
670 static irqreturn_t test_action(int cpl, void *dev_id)
671 {
672 return IRQ_NONE;
673 }
674 #endif
675
676 int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
677 {
678 struct pcmcia_socket *s = p_dev->socket;
679 config_t *c;
680 int ret = -EINVAL, irq = 0;
681 int type;
682
683 if (!(s->state & SOCKET_PRESENT))
684 return -ENODEV;
685 c = p_dev->function_config;
686 if (c->state & CONFIG_LOCKED)
687 return -EACCES;
688 if (c->state & CONFIG_IRQ_REQ) {
689 ds_dbg(s, 0, "IRQ already configured\n");
690 return -EBUSY;
691 }
692
693 /* Decide what type of interrupt we are registering */
694 type = 0;
695 if (s->functions > 1) /* All of this ought to be handled higher up */
696 type = IRQF_SHARED;
697 else if (req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)
698 type = IRQF_SHARED;
699 else printk(KERN_WARNING "pcmcia: Driver needs updating to support IRQ sharing.\n");
700
701 #ifdef CONFIG_PCMCIA_PROBE
702
703 #ifdef IRQ_NOAUTOEN
704 /* if the underlying IRQ infrastructure allows for it, only allocate
705 * the IRQ, but do not enable it
706 */
707 if (!(req->Attributes & IRQ_HANDLE_PRESENT))
708 type |= IRQ_NOAUTOEN;
709 #endif /* IRQ_NOAUTOEN */
710
711 if (s->irq.AssignedIRQ != 0) {
712 /* If the interrupt is already assigned, it must be the same */
713 irq = s->irq.AssignedIRQ;
714 } else {
715 int try;
716 u32 mask = s->irq_mask;
717 void *data = &p_dev->dev.driver; /* something unique to this device */
718
719 for (try = 0; try < 64; try++) {
720 irq = try % 32;
721
722 /* marked as available by driver, and not blocked by userspace? */
723 if (!((mask >> irq) & 1))
724 continue;
725
726 /* avoid an IRQ which is already used by a PCMCIA card */
727 if ((try < 32) && pcmcia_used_irq[irq])
728 continue;
729
730 /* register the correct driver, if possible, of check whether
731 * registering a dummy handle works, i.e. if the IRQ isn't
732 * marked as used by the kernel resource management core */
733 ret = request_irq(irq,
734 (req->Attributes & IRQ_HANDLE_PRESENT) ? req->Handler : test_action,
735 type,
736 p_dev->devname,
737 (req->Attributes & IRQ_HANDLE_PRESENT) ? req->Instance : data);
738 if (!ret) {
739 if (!(req->Attributes & IRQ_HANDLE_PRESENT))
740 free_irq(irq, data);
741 break;
742 }
743 }
744 }
745 #endif
746 /* only assign PCI irq if no IRQ already assigned */
747 if (ret && !s->irq.AssignedIRQ) {
748 if (!s->pci_irq)
749 return ret;
750 type = IRQF_SHARED;
751 irq = s->pci_irq;
752 }
753
754 if (ret && (req->Attributes & IRQ_HANDLE_PRESENT)) {
755 ret = request_irq(irq, req->Handler, type,
756 p_dev->devname, req->Instance);
757 if (ret)
758 return ret;
759 }
760
761 /* Make sure the fact the request type was overridden is passed back */
762 if (type == IRQF_SHARED && !(req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)) {
763 req->Attributes |= IRQ_TYPE_DYNAMIC_SHARING;
764 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: "
765 "request for exclusive IRQ could not be fulfilled.\n");
766 dev_printk(KERN_WARNING, &p_dev->dev, "pcmcia: the driver "
767 "needs updating to supported shared IRQ lines.\n");
768 }
769 c->irq.Attributes = req->Attributes;
770 s->irq.AssignedIRQ = req->AssignedIRQ = irq;
771 s->irq.Config++;
772
773 c->state |= CONFIG_IRQ_REQ;
774 p_dev->_irq = 1;
775
776 #ifdef CONFIG_PCMCIA_PROBE
777 pcmcia_used_irq[irq]++;
778 #endif
779
780 return 0;
781 } /* pcmcia_request_irq */
782 EXPORT_SYMBOL(pcmcia_request_irq);
783
784
785 /** pcmcia_request_window
786 *
787 * Request_window() establishes a mapping between card memory space
788 * and system memory space.
789 */
790 int pcmcia_request_window(struct pcmcia_device **p_dev, win_req_t *req, window_handle_t *wh)
791 {
792 struct pcmcia_socket *s = (*p_dev)->socket;
793 window_t *win;
794 u_long align;
795 int w;
796
797 if (!(s->state & SOCKET_PRESENT))
798 return -ENODEV;
799 if (req->Attributes & (WIN_PAGED | WIN_SHARED)) {
800 ds_dbg(s, 0, "bad attribute setting for iomem region\n");
801 return -EINVAL;
802 }
803
804 /* Window size defaults to smallest available */
805 if (req->Size == 0)
806 req->Size = s->map_size;
807 align = (((s->features & SS_CAP_MEM_ALIGN) ||
808 (req->Attributes & WIN_STRICT_ALIGN)) ?
809 req->Size : s->map_size);
810 if (req->Size & (s->map_size-1)) {
811 ds_dbg(s, 0, "invalid map size\n");
812 return -EINVAL;
813 }
814 if ((req->Base && (s->features & SS_CAP_STATIC_MAP)) ||
815 (req->Base & (align-1))) {
816 ds_dbg(s, 0, "invalid base address\n");
817 return -EINVAL;
818 }
819 if (req->Base)
820 align = 0;
821
822 /* Allocate system memory window */
823 for (w = 0; w < MAX_WIN; w++)
824 if (!(s->state & SOCKET_WIN_REQ(w))) break;
825 if (w == MAX_WIN) {
826 ds_dbg(s, 0, "all windows are used already\n");
827 return -EINVAL;
828 }
829
830 win = &s->win[w];
831 win->magic = WINDOW_MAGIC;
832 win->index = w;
833 win->handle = *p_dev;
834 win->sock = s;
835
836 if (!(s->features & SS_CAP_STATIC_MAP)) {
837 win->ctl.res = pcmcia_find_mem_region(req->Base, req->Size, align,
838 (req->Attributes & WIN_MAP_BELOW_1MB), s);
839 if (!win->ctl.res) {
840 ds_dbg(s, 0, "allocating mem region failed\n");
841 return -EINVAL;
842 }
843 }
844 (*p_dev)->_win |= CLIENT_WIN_REQ(w);
845
846 /* Configure the socket controller */
847 win->ctl.map = w+1;
848 win->ctl.flags = 0;
849 win->ctl.speed = req->AccessSpeed;
850 if (req->Attributes & WIN_MEMORY_TYPE)
851 win->ctl.flags |= MAP_ATTRIB;
852 if (req->Attributes & WIN_ENABLE)
853 win->ctl.flags |= MAP_ACTIVE;
854 if (req->Attributes & WIN_DATA_WIDTH_16)
855 win->ctl.flags |= MAP_16BIT;
856 if (req->Attributes & WIN_USE_WAIT)
857 win->ctl.flags |= MAP_USE_WAIT;
858 win->ctl.card_start = 0;
859 if (s->ops->set_mem_map(s, &win->ctl) != 0) {
860 ds_dbg(s, 0, "failed to set memory mapping\n");
861 return -EIO;
862 }
863 s->state |= SOCKET_WIN_REQ(w);
864
865 /* Return window handle */
866 if (s->features & SS_CAP_STATIC_MAP) {
867 req->Base = win->ctl.static_start;
868 } else {
869 req->Base = win->ctl.res->start;
870 }
871 *wh = win;
872
873 return 0;
874 } /* pcmcia_request_window */
875 EXPORT_SYMBOL(pcmcia_request_window);
876
877 void pcmcia_disable_device(struct pcmcia_device *p_dev) {
878 pcmcia_release_configuration(p_dev);
879 pcmcia_release_io(p_dev, &p_dev->io);
880 pcmcia_release_irq(p_dev, &p_dev->irq);
881 if (p_dev->win)
882 pcmcia_release_window(p_dev->win);
883 }
884 EXPORT_SYMBOL(pcmcia_disable_device);
885
886
887 struct pcmcia_cfg_mem {
888 tuple_t tuple;
889 cisparse_t parse;
890 u8 buf[256];
891 cistpl_cftable_entry_t dflt;
892 };
893
894 /**
895 * pcmcia_loop_config() - loop over configuration options
896 * @p_dev: the struct pcmcia_device which we need to loop for.
897 * @conf_check: function to call for each configuration option.
898 * It gets passed the struct pcmcia_device, the CIS data
899 * describing the configuration option, and private data
900 * being passed to pcmcia_loop_config()
901 * @priv_data: private data to be passed to the conf_check function.
902 *
903 * pcmcia_loop_config() loops over all configuration options, and calls
904 * the driver-specific conf_check() for each one, checking whether
905 * it is a valid one.
906 */
907 int pcmcia_loop_config(struct pcmcia_device *p_dev,
908 int (*conf_check) (struct pcmcia_device *p_dev,
909 cistpl_cftable_entry_t *cfg,
910 cistpl_cftable_entry_t *dflt,
911 unsigned int vcc,
912 void *priv_data),
913 void *priv_data)
914 {
915 struct pcmcia_cfg_mem *cfg_mem;
916
917 tuple_t *tuple;
918 int ret = -ENODEV;
919 unsigned int vcc;
920
921 cfg_mem = kzalloc(sizeof(struct pcmcia_cfg_mem), GFP_KERNEL);
922 if (cfg_mem == NULL)
923 return -ENOMEM;
924
925 /* get the current Vcc setting */
926 vcc = p_dev->socket->socket.Vcc;
927
928 tuple = &cfg_mem->tuple;
929 tuple->TupleData = cfg_mem->buf;
930 tuple->TupleDataMax = 255;
931 tuple->TupleOffset = 0;
932 tuple->DesiredTuple = CISTPL_CFTABLE_ENTRY;
933 tuple->Attributes = 0;
934
935 ret = pcmcia_get_first_tuple(p_dev, tuple);
936 while (!ret) {
937 cistpl_cftable_entry_t *cfg = &cfg_mem->parse.cftable_entry;
938
939 if (pcmcia_get_tuple_data(p_dev, tuple))
940 goto next_entry;
941
942 if (pcmcia_parse_tuple(tuple, &cfg_mem->parse))
943 goto next_entry;
944
945 /* default values */
946 p_dev->conf.ConfigIndex = cfg->index;
947 if (cfg->flags & CISTPL_CFTABLE_DEFAULT)
948 cfg_mem->dflt = *cfg;
949
950 ret = conf_check(p_dev, cfg, &cfg_mem->dflt, vcc, priv_data);
951 if (!ret)
952 break;
953
954 next_entry:
955 ret = pcmcia_get_next_tuple(p_dev, tuple);
956 }
957
958 return ret;
959 }
960 EXPORT_SYMBOL(pcmcia_loop_config);
Support for the Chinese Samsung S3C2440 based development boards