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1da177e4 LT |
1 | /* |
2 | * linux/drivers/mmc/mmc.c | |
3 | * | |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/config.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/completion.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/pagemap.h> | |
18 | #include <linux/err.h> | |
19 | ||
20 | #include <linux/mmc/card.h> | |
21 | #include <linux/mmc/host.h> | |
22 | #include <linux/mmc/protocol.h> | |
23 | ||
24 | #include "mmc.h" | |
25 | ||
26 | #ifdef CONFIG_MMC_DEBUG | |
27 | #define DBG(x...) printk(KERN_DEBUG x) | |
28 | #else | |
29 | #define DBG(x...) do { } while (0) | |
30 | #endif | |
31 | ||
32 | #define CMD_RETRIES 3 | |
33 | ||
34 | /* | |
35 | * OCR Bit positions to 10s of Vdd mV. | |
36 | */ | |
37 | static const unsigned short mmc_ocr_bit_to_vdd[] = { | |
38 | 150, 155, 160, 165, 170, 180, 190, 200, | |
39 | 210, 220, 230, 240, 250, 260, 270, 280, | |
40 | 290, 300, 310, 320, 330, 340, 350, 360 | |
41 | }; | |
42 | ||
43 | static const unsigned int tran_exp[] = { | |
44 | 10000, 100000, 1000000, 10000000, | |
45 | 0, 0, 0, 0 | |
46 | }; | |
47 | ||
48 | static const unsigned char tran_mant[] = { | |
49 | 0, 10, 12, 13, 15, 20, 25, 30, | |
50 | 35, 40, 45, 50, 55, 60, 70, 80, | |
51 | }; | |
52 | ||
53 | static const unsigned int tacc_exp[] = { | |
54 | 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, | |
55 | }; | |
56 | ||
57 | static const unsigned int tacc_mant[] = { | |
58 | 0, 10, 12, 13, 15, 20, 25, 30, | |
59 | 35, 40, 45, 50, 55, 60, 70, 80, | |
60 | }; | |
61 | ||
62 | ||
63 | /** | |
64 | * mmc_request_done - finish processing an MMC command | |
65 | * @host: MMC host which completed command | |
66 | * @mrq: MMC request which completed | |
67 | * | |
68 | * MMC drivers should call this function when they have completed | |
69 | * their processing of a command. This should be called before the | |
70 | * data part of the command has completed. | |
71 | */ | |
72 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
73 | { | |
74 | struct mmc_command *cmd = mrq->cmd; | |
75 | int err = mrq->cmd->error; | |
76 | DBG("MMC: req done (%02x): %d: %08x %08x %08x %08x\n", cmd->opcode, | |
77 | err, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); | |
78 | ||
79 | if (err && cmd->retries) { | |
80 | cmd->retries--; | |
81 | cmd->error = 0; | |
82 | host->ops->request(host, mrq); | |
83 | } else if (mrq->done) { | |
84 | mrq->done(mrq); | |
85 | } | |
86 | } | |
87 | ||
88 | EXPORT_SYMBOL(mmc_request_done); | |
89 | ||
90 | /** | |
91 | * mmc_start_request - start a command on a host | |
92 | * @host: MMC host to start command on | |
93 | * @mrq: MMC request to start | |
94 | * | |
95 | * Queue a command on the specified host. We expect the | |
96 | * caller to be holding the host lock with interrupts disabled. | |
97 | */ | |
98 | void | |
99 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) | |
100 | { | |
101 | DBG("MMC: starting cmd %02x arg %08x flags %08x\n", | |
102 | mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags); | |
103 | ||
104 | WARN_ON(host->card_busy == NULL); | |
105 | ||
106 | mrq->cmd->error = 0; | |
107 | mrq->cmd->mrq = mrq; | |
108 | if (mrq->data) { | |
109 | mrq->cmd->data = mrq->data; | |
110 | mrq->data->error = 0; | |
111 | mrq->data->mrq = mrq; | |
112 | if (mrq->stop) { | |
113 | mrq->data->stop = mrq->stop; | |
114 | mrq->stop->error = 0; | |
115 | mrq->stop->mrq = mrq; | |
116 | } | |
117 | } | |
118 | host->ops->request(host, mrq); | |
119 | } | |
120 | ||
121 | EXPORT_SYMBOL(mmc_start_request); | |
122 | ||
123 | static void mmc_wait_done(struct mmc_request *mrq) | |
124 | { | |
125 | complete(mrq->done_data); | |
126 | } | |
127 | ||
128 | int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
129 | { | |
130 | DECLARE_COMPLETION(complete); | |
131 | ||
132 | mrq->done_data = &complete; | |
133 | mrq->done = mmc_wait_done; | |
134 | ||
135 | mmc_start_request(host, mrq); | |
136 | ||
137 | wait_for_completion(&complete); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | EXPORT_SYMBOL(mmc_wait_for_req); | |
143 | ||
144 | /** | |
145 | * mmc_wait_for_cmd - start a command and wait for completion | |
146 | * @host: MMC host to start command | |
147 | * @cmd: MMC command to start | |
148 | * @retries: maximum number of retries | |
149 | * | |
150 | * Start a new MMC command for a host, and wait for the command | |
151 | * to complete. Return any error that occurred while the command | |
152 | * was executing. Do not attempt to parse the response. | |
153 | */ | |
154 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
155 | { | |
156 | struct mmc_request mrq; | |
157 | ||
158 | BUG_ON(host->card_busy == NULL); | |
159 | ||
160 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
161 | ||
162 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
163 | cmd->retries = retries; | |
164 | ||
165 | mrq.cmd = cmd; | |
166 | cmd->data = NULL; | |
167 | ||
168 | mmc_wait_for_req(host, &mrq); | |
169 | ||
170 | return cmd->error; | |
171 | } | |
172 | ||
173 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
174 | ||
175 | ||
176 | ||
177 | /** | |
178 | * __mmc_claim_host - exclusively claim a host | |
179 | * @host: mmc host to claim | |
180 | * @card: mmc card to claim host for | |
181 | * | |
182 | * Claim a host for a set of operations. If a valid card | |
183 | * is passed and this wasn't the last card selected, select | |
184 | * the card before returning. | |
185 | * | |
186 | * Note: you should use mmc_card_claim_host or mmc_claim_host. | |
187 | */ | |
188 | int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card) | |
189 | { | |
190 | DECLARE_WAITQUEUE(wait, current); | |
191 | unsigned long flags; | |
192 | int err = 0; | |
193 | ||
194 | add_wait_queue(&host->wq, &wait); | |
195 | spin_lock_irqsave(&host->lock, flags); | |
196 | while (1) { | |
197 | set_current_state(TASK_UNINTERRUPTIBLE); | |
198 | if (host->card_busy == NULL) | |
199 | break; | |
200 | spin_unlock_irqrestore(&host->lock, flags); | |
201 | schedule(); | |
202 | spin_lock_irqsave(&host->lock, flags); | |
203 | } | |
204 | set_current_state(TASK_RUNNING); | |
205 | host->card_busy = card; | |
206 | spin_unlock_irqrestore(&host->lock, flags); | |
207 | remove_wait_queue(&host->wq, &wait); | |
208 | ||
209 | if (card != (void *)-1 && host->card_selected != card) { | |
210 | struct mmc_command cmd; | |
211 | ||
212 | host->card_selected = card; | |
213 | ||
214 | cmd.opcode = MMC_SELECT_CARD; | |
215 | cmd.arg = card->rca << 16; | |
216 | cmd.flags = MMC_RSP_R1; | |
217 | ||
218 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
219 | } | |
220 | ||
221 | return err; | |
222 | } | |
223 | ||
224 | EXPORT_SYMBOL(__mmc_claim_host); | |
225 | ||
226 | /** | |
227 | * mmc_release_host - release a host | |
228 | * @host: mmc host to release | |
229 | * | |
230 | * Release a MMC host, allowing others to claim the host | |
231 | * for their operations. | |
232 | */ | |
233 | void mmc_release_host(struct mmc_host *host) | |
234 | { | |
235 | unsigned long flags; | |
236 | ||
237 | BUG_ON(host->card_busy == NULL); | |
238 | ||
239 | spin_lock_irqsave(&host->lock, flags); | |
240 | host->card_busy = NULL; | |
241 | spin_unlock_irqrestore(&host->lock, flags); | |
242 | ||
243 | wake_up(&host->wq); | |
244 | } | |
245 | ||
246 | EXPORT_SYMBOL(mmc_release_host); | |
247 | ||
248 | /* | |
249 | * Ensure that no card is selected. | |
250 | */ | |
251 | static void mmc_deselect_cards(struct mmc_host *host) | |
252 | { | |
253 | struct mmc_command cmd; | |
254 | ||
255 | if (host->card_selected) { | |
256 | host->card_selected = NULL; | |
257 | ||
258 | cmd.opcode = MMC_SELECT_CARD; | |
259 | cmd.arg = 0; | |
260 | cmd.flags = MMC_RSP_NONE; | |
261 | ||
262 | mmc_wait_for_cmd(host, &cmd, 0); | |
263 | } | |
264 | } | |
265 | ||
266 | ||
267 | static inline void mmc_delay(unsigned int ms) | |
268 | { | |
269 | if (ms < HZ / 1000) { | |
270 | yield(); | |
271 | mdelay(ms); | |
272 | } else { | |
273 | msleep_interruptible (ms); | |
274 | } | |
275 | } | |
276 | ||
277 | /* | |
278 | * Mask off any voltages we don't support and select | |
279 | * the lowest voltage | |
280 | */ | |
281 | static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) | |
282 | { | |
283 | int bit; | |
284 | ||
285 | ocr &= host->ocr_avail; | |
286 | ||
287 | bit = ffs(ocr); | |
288 | if (bit) { | |
289 | bit -= 1; | |
290 | ||
291 | ocr = 3 << bit; | |
292 | ||
293 | host->ios.vdd = bit; | |
294 | host->ops->set_ios(host, &host->ios); | |
295 | } else { | |
296 | ocr = 0; | |
297 | } | |
298 | ||
299 | return ocr; | |
300 | } | |
301 | ||
302 | #define UNSTUFF_BITS(resp,start,size) \ | |
303 | ({ \ | |
304 | const int __size = size; \ | |
305 | const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ | |
306 | const int __off = 3 - ((start) / 32); \ | |
307 | const int __shft = (start) & 31; \ | |
308 | u32 __res; \ | |
309 | \ | |
310 | __res = resp[__off] >> __shft; \ | |
311 | if (__size + __shft > 32) \ | |
312 | __res |= resp[__off-1] << ((32 - __shft) % 32); \ | |
313 | __res & __mask; \ | |
314 | }) | |
315 | ||
316 | /* | |
317 | * Given the decoded CSD structure, decode the raw CID to our CID structure. | |
318 | */ | |
319 | static void mmc_decode_cid(struct mmc_card *card) | |
320 | { | |
321 | u32 *resp = card->raw_cid; | |
322 | ||
323 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
324 | ||
325 | /* | |
326 | * The selection of the format here is guesswork based upon | |
327 | * information people have sent to date. | |
328 | */ | |
329 | switch (card->csd.mmca_vsn) { | |
330 | case 0: /* MMC v1.? */ | |
331 | case 1: /* MMC v1.4 */ | |
332 | card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); | |
333 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
334 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
335 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
336 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
337 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
338 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
339 | card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); | |
340 | card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); | |
341 | card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); | |
342 | card->cid.serial = UNSTUFF_BITS(resp, 16, 24); | |
343 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
344 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
345 | break; | |
346 | ||
347 | case 2: /* MMC v2.x ? */ | |
348 | case 3: /* MMC v3.x ? */ | |
349 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
350 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
351 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
352 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
353 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
354 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
355 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
356 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
357 | card->cid.serial = UNSTUFF_BITS(resp, 16, 32); | |
358 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
359 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
360 | break; | |
361 | ||
362 | default: | |
363 | printk("%s: card has unknown MMCA version %d\n", | |
364 | card->host->host_name, card->csd.mmca_vsn); | |
365 | mmc_card_set_bad(card); | |
366 | break; | |
367 | } | |
368 | } | |
369 | ||
370 | /* | |
371 | * Given a 128-bit response, decode to our card CSD structure. | |
372 | */ | |
373 | static void mmc_decode_csd(struct mmc_card *card) | |
374 | { | |
375 | struct mmc_csd *csd = &card->csd; | |
376 | unsigned int e, m, csd_struct; | |
377 | u32 *resp = card->raw_csd; | |
378 | ||
379 | /* | |
380 | * We only understand CSD structure v1.1 and v2. | |
381 | * v2 has extra information in bits 15, 11 and 10. | |
382 | */ | |
383 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
384 | if (csd_struct != 1 && csd_struct != 2) { | |
385 | printk("%s: unrecognised CSD structure version %d\n", | |
386 | card->host->host_name, csd_struct); | |
387 | mmc_card_set_bad(card); | |
388 | return; | |
389 | } | |
390 | ||
391 | csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); | |
392 | m = UNSTUFF_BITS(resp, 115, 4); | |
393 | e = UNSTUFF_BITS(resp, 112, 3); | |
394 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
395 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
396 | ||
397 | m = UNSTUFF_BITS(resp, 99, 4); | |
398 | e = UNSTUFF_BITS(resp, 96, 3); | |
399 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
400 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
401 | ||
402 | e = UNSTUFF_BITS(resp, 47, 3); | |
403 | m = UNSTUFF_BITS(resp, 62, 12); | |
404 | csd->capacity = (1 + m) << (e + 2); | |
405 | ||
406 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
407 | } | |
408 | ||
409 | /* | |
410 | * Locate a MMC card on this MMC host given a raw CID. | |
411 | */ | |
412 | static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid) | |
413 | { | |
414 | struct mmc_card *card; | |
415 | ||
416 | list_for_each_entry(card, &host->cards, node) { | |
417 | if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0) | |
418 | return card; | |
419 | } | |
420 | return NULL; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Allocate a new MMC card, and assign a unique RCA. | |
425 | */ | |
426 | static struct mmc_card * | |
427 | mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca) | |
428 | { | |
429 | struct mmc_card *card, *c; | |
430 | unsigned int rca = *frca; | |
431 | ||
432 | card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); | |
433 | if (!card) | |
434 | return ERR_PTR(-ENOMEM); | |
435 | ||
436 | mmc_init_card(card, host); | |
437 | memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); | |
438 | ||
439 | again: | |
440 | list_for_each_entry(c, &host->cards, node) | |
441 | if (c->rca == rca) { | |
442 | rca++; | |
443 | goto again; | |
444 | } | |
445 | ||
446 | card->rca = rca; | |
447 | ||
448 | *frca = rca; | |
449 | ||
450 | return card; | |
451 | } | |
452 | ||
453 | /* | |
454 | * Tell attached cards to go to IDLE state | |
455 | */ | |
456 | static void mmc_idle_cards(struct mmc_host *host) | |
457 | { | |
458 | struct mmc_command cmd; | |
459 | ||
460 | cmd.opcode = MMC_GO_IDLE_STATE; | |
461 | cmd.arg = 0; | |
462 | cmd.flags = MMC_RSP_NONE; | |
463 | ||
464 | mmc_wait_for_cmd(host, &cmd, 0); | |
465 | ||
466 | mmc_delay(1); | |
467 | } | |
468 | ||
469 | /* | |
470 | * Apply power to the MMC stack. | |
471 | */ | |
472 | static void mmc_power_up(struct mmc_host *host) | |
473 | { | |
474 | int bit = fls(host->ocr_avail) - 1; | |
475 | ||
476 | host->ios.vdd = bit; | |
477 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
478 | host->ios.power_mode = MMC_POWER_UP; | |
479 | host->ops->set_ios(host, &host->ios); | |
480 | ||
481 | mmc_delay(1); | |
482 | ||
483 | host->ios.clock = host->f_min; | |
484 | host->ios.power_mode = MMC_POWER_ON; | |
485 | host->ops->set_ios(host, &host->ios); | |
486 | ||
487 | mmc_delay(2); | |
488 | } | |
489 | ||
490 | static void mmc_power_off(struct mmc_host *host) | |
491 | { | |
492 | host->ios.clock = 0; | |
493 | host->ios.vdd = 0; | |
494 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
495 | host->ios.power_mode = MMC_POWER_OFF; | |
496 | host->ops->set_ios(host, &host->ios); | |
497 | } | |
498 | ||
499 | static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) | |
500 | { | |
501 | struct mmc_command cmd; | |
502 | int i, err = 0; | |
503 | ||
504 | cmd.opcode = MMC_SEND_OP_COND; | |
505 | cmd.arg = ocr; | |
506 | cmd.flags = MMC_RSP_R3; | |
507 | ||
508 | for (i = 100; i; i--) { | |
509 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
510 | if (err != MMC_ERR_NONE) | |
511 | break; | |
512 | ||
513 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
514 | break; | |
515 | ||
516 | err = MMC_ERR_TIMEOUT; | |
517 | ||
518 | mmc_delay(10); | |
519 | } | |
520 | ||
521 | if (rocr) | |
522 | *rocr = cmd.resp[0]; | |
523 | ||
524 | return err; | |
525 | } | |
526 | ||
527 | /* | |
528 | * Discover cards by requesting their CID. If this command | |
529 | * times out, it is not an error; there are no further cards | |
530 | * to be discovered. Add new cards to the list. | |
531 | * | |
532 | * Create a mmc_card entry for each discovered card, assigning | |
533 | * it an RCA, and save the raw CID for decoding later. | |
534 | */ | |
535 | static void mmc_discover_cards(struct mmc_host *host) | |
536 | { | |
537 | struct mmc_card *card; | |
538 | unsigned int first_rca = 1, err; | |
539 | ||
540 | while (1) { | |
541 | struct mmc_command cmd; | |
542 | ||
543 | cmd.opcode = MMC_ALL_SEND_CID; | |
544 | cmd.arg = 0; | |
545 | cmd.flags = MMC_RSP_R2; | |
546 | ||
547 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
548 | if (err == MMC_ERR_TIMEOUT) { | |
549 | err = MMC_ERR_NONE; | |
550 | break; | |
551 | } | |
552 | if (err != MMC_ERR_NONE) { | |
553 | printk(KERN_ERR "%s: error requesting CID: %d\n", | |
554 | host->host_name, err); | |
555 | break; | |
556 | } | |
557 | ||
558 | card = mmc_find_card(host, cmd.resp); | |
559 | if (!card) { | |
560 | card = mmc_alloc_card(host, cmd.resp, &first_rca); | |
561 | if (IS_ERR(card)) { | |
562 | err = PTR_ERR(card); | |
563 | break; | |
564 | } | |
565 | list_add(&card->node, &host->cards); | |
566 | } | |
567 | ||
568 | card->state &= ~MMC_STATE_DEAD; | |
569 | ||
570 | cmd.opcode = MMC_SET_RELATIVE_ADDR; | |
571 | cmd.arg = card->rca << 16; | |
572 | cmd.flags = MMC_RSP_R1; | |
573 | ||
574 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
575 | if (err != MMC_ERR_NONE) | |
576 | mmc_card_set_dead(card); | |
577 | } | |
578 | } | |
579 | ||
580 | static void mmc_read_csds(struct mmc_host *host) | |
581 | { | |
582 | struct mmc_card *card; | |
583 | ||
584 | list_for_each_entry(card, &host->cards, node) { | |
585 | struct mmc_command cmd; | |
586 | int err; | |
587 | ||
588 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
589 | continue; | |
590 | ||
591 | cmd.opcode = MMC_SEND_CSD; | |
592 | cmd.arg = card->rca << 16; | |
593 | cmd.flags = MMC_RSP_R2; | |
594 | ||
595 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
596 | if (err != MMC_ERR_NONE) { | |
597 | mmc_card_set_dead(card); | |
598 | continue; | |
599 | } | |
600 | ||
601 | memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd)); | |
602 | ||
603 | mmc_decode_csd(card); | |
604 | mmc_decode_cid(card); | |
605 | } | |
606 | } | |
607 | ||
608 | static unsigned int mmc_calculate_clock(struct mmc_host *host) | |
609 | { | |
610 | struct mmc_card *card; | |
611 | unsigned int max_dtr = host->f_max; | |
612 | ||
613 | list_for_each_entry(card, &host->cards, node) | |
614 | if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr) | |
615 | max_dtr = card->csd.max_dtr; | |
616 | ||
617 | DBG("MMC: selected %d.%03dMHz transfer rate\n", | |
618 | max_dtr / 1000000, (max_dtr / 1000) % 1000); | |
619 | ||
620 | return max_dtr; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Check whether cards we already know about are still present. | |
625 | * We do this by requesting status, and checking whether a card | |
626 | * responds. | |
627 | * | |
628 | * A request for status does not cause a state change in data | |
629 | * transfer mode. | |
630 | */ | |
631 | static void mmc_check_cards(struct mmc_host *host) | |
632 | { | |
633 | struct list_head *l, *n; | |
634 | ||
635 | mmc_deselect_cards(host); | |
636 | ||
637 | list_for_each_safe(l, n, &host->cards) { | |
638 | struct mmc_card *card = mmc_list_to_card(l); | |
639 | struct mmc_command cmd; | |
640 | int err; | |
641 | ||
642 | cmd.opcode = MMC_SEND_STATUS; | |
643 | cmd.arg = card->rca << 16; | |
644 | cmd.flags = MMC_RSP_R1; | |
645 | ||
646 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
647 | if (err == MMC_ERR_NONE) | |
648 | continue; | |
649 | ||
650 | mmc_card_set_dead(card); | |
651 | } | |
652 | } | |
653 | ||
654 | static void mmc_setup(struct mmc_host *host) | |
655 | { | |
656 | if (host->ios.power_mode != MMC_POWER_ON) { | |
657 | int err; | |
658 | u32 ocr; | |
659 | ||
660 | mmc_power_up(host); | |
661 | mmc_idle_cards(host); | |
662 | ||
663 | err = mmc_send_op_cond(host, 0, &ocr); | |
664 | if (err != MMC_ERR_NONE) | |
665 | return; | |
666 | ||
667 | host->ocr = mmc_select_voltage(host, ocr); | |
668 | ||
669 | /* | |
670 | * Since we're changing the OCR value, we seem to | |
671 | * need to tell some cards to go back to the idle | |
672 | * state. We wait 1ms to give cards time to | |
673 | * respond. | |
674 | */ | |
675 | if (host->ocr) | |
676 | mmc_idle_cards(host); | |
677 | } else { | |
678 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
679 | host->ios.clock = host->f_min; | |
680 | host->ops->set_ios(host, &host->ios); | |
681 | ||
682 | /* | |
683 | * We should remember the OCR mask from the existing | |
684 | * cards, and detect the new cards OCR mask, combine | |
685 | * the two and re-select the VDD. However, if we do | |
686 | * change VDD, we should do an idle, and then do a | |
687 | * full re-initialisation. We would need to notify | |
688 | * drivers so that they can re-setup the cards as | |
689 | * well, while keeping their queues at bay. | |
690 | * | |
691 | * For the moment, we take the easy way out - if the | |
692 | * new cards don't like our currently selected VDD, | |
693 | * they drop off the bus. | |
694 | */ | |
695 | } | |
696 | ||
697 | if (host->ocr == 0) | |
698 | return; | |
699 | ||
700 | /* | |
701 | * Send the selected OCR multiple times... until the cards | |
702 | * all get the idea that they should be ready for CMD2. | |
703 | * (My SanDisk card seems to need this.) | |
704 | */ | |
705 | mmc_send_op_cond(host, host->ocr, NULL); | |
706 | ||
707 | mmc_discover_cards(host); | |
708 | ||
709 | /* | |
710 | * Ok, now switch to push-pull mode. | |
711 | */ | |
712 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
713 | host->ops->set_ios(host, &host->ios); | |
714 | ||
715 | mmc_read_csds(host); | |
716 | } | |
717 | ||
718 | ||
719 | /** | |
720 | * mmc_detect_change - process change of state on a MMC socket | |
721 | * @host: host which changed state. | |
722 | * | |
723 | * All we know is that card(s) have been inserted or removed | |
724 | * from the socket(s). We don't know which socket or cards. | |
725 | */ | |
726 | void mmc_detect_change(struct mmc_host *host) | |
727 | { | |
728 | schedule_work(&host->detect); | |
729 | } | |
730 | ||
731 | EXPORT_SYMBOL(mmc_detect_change); | |
732 | ||
733 | ||
734 | static void mmc_rescan(void *data) | |
735 | { | |
736 | struct mmc_host *host = data; | |
737 | struct list_head *l, *n; | |
738 | ||
739 | mmc_claim_host(host); | |
740 | ||
741 | if (host->ios.power_mode == MMC_POWER_ON) | |
742 | mmc_check_cards(host); | |
743 | ||
744 | mmc_setup(host); | |
745 | ||
746 | if (!list_empty(&host->cards)) { | |
747 | /* | |
748 | * (Re-)calculate the fastest clock rate which the | |
749 | * attached cards and the host support. | |
750 | */ | |
751 | host->ios.clock = mmc_calculate_clock(host); | |
752 | host->ops->set_ios(host, &host->ios); | |
753 | } | |
754 | ||
755 | mmc_release_host(host); | |
756 | ||
757 | list_for_each_safe(l, n, &host->cards) { | |
758 | struct mmc_card *card = mmc_list_to_card(l); | |
759 | ||
760 | /* | |
761 | * If this is a new and good card, register it. | |
762 | */ | |
763 | if (!mmc_card_present(card) && !mmc_card_dead(card)) { | |
764 | if (mmc_register_card(card)) | |
765 | mmc_card_set_dead(card); | |
766 | else | |
767 | mmc_card_set_present(card); | |
768 | } | |
769 | ||
770 | /* | |
771 | * If this card is dead, destroy it. | |
772 | */ | |
773 | if (mmc_card_dead(card)) { | |
774 | list_del(&card->node); | |
775 | mmc_remove_card(card); | |
776 | } | |
777 | } | |
778 | ||
779 | /* | |
780 | * If we discover that there are no cards on the | |
781 | * bus, turn off the clock and power down. | |
782 | */ | |
783 | if (list_empty(&host->cards)) | |
784 | mmc_power_off(host); | |
785 | } | |
786 | ||
787 | ||
788 | /** | |
789 | * mmc_alloc_host - initialise the per-host structure. | |
790 | * @extra: sizeof private data structure | |
791 | * @dev: pointer to host device model structure | |
792 | * | |
793 | * Initialise the per-host structure. | |
794 | */ | |
795 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
796 | { | |
797 | struct mmc_host *host; | |
798 | ||
799 | host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); | |
800 | if (host) { | |
801 | memset(host, 0, sizeof(struct mmc_host) + extra); | |
802 | ||
803 | spin_lock_init(&host->lock); | |
804 | init_waitqueue_head(&host->wq); | |
805 | INIT_LIST_HEAD(&host->cards); | |
806 | INIT_WORK(&host->detect, mmc_rescan, host); | |
807 | ||
808 | host->dev = dev; | |
809 | ||
810 | /* | |
811 | * By default, hosts do not support SGIO or large requests. | |
812 | * They have to set these according to their abilities. | |
813 | */ | |
814 | host->max_hw_segs = 1; | |
815 | host->max_phys_segs = 1; | |
816 | host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9); | |
817 | host->max_seg_size = PAGE_CACHE_SIZE; | |
818 | } | |
819 | ||
820 | return host; | |
821 | } | |
822 | ||
823 | EXPORT_SYMBOL(mmc_alloc_host); | |
824 | ||
825 | /** | |
826 | * mmc_add_host - initialise host hardware | |
827 | * @host: mmc host | |
828 | */ | |
829 | int mmc_add_host(struct mmc_host *host) | |
830 | { | |
831 | static unsigned int host_num; | |
832 | ||
833 | snprintf(host->host_name, sizeof(host->host_name), | |
834 | "mmc%d", host_num++); | |
835 | ||
836 | mmc_power_off(host); | |
837 | mmc_detect_change(host); | |
838 | ||
839 | return 0; | |
840 | } | |
841 | ||
842 | EXPORT_SYMBOL(mmc_add_host); | |
843 | ||
844 | /** | |
845 | * mmc_remove_host - remove host hardware | |
846 | * @host: mmc host | |
847 | * | |
848 | * Unregister and remove all cards associated with this host, | |
849 | * and power down the MMC bus. | |
850 | */ | |
851 | void mmc_remove_host(struct mmc_host *host) | |
852 | { | |
853 | struct list_head *l, *n; | |
854 | ||
855 | list_for_each_safe(l, n, &host->cards) { | |
856 | struct mmc_card *card = mmc_list_to_card(l); | |
857 | ||
858 | mmc_remove_card(card); | |
859 | } | |
860 | ||
861 | mmc_power_off(host); | |
862 | } | |
863 | ||
864 | EXPORT_SYMBOL(mmc_remove_host); | |
865 | ||
866 | /** | |
867 | * mmc_free_host - free the host structure | |
868 | * @host: mmc host | |
869 | * | |
870 | * Free the host once all references to it have been dropped. | |
871 | */ | |
872 | void mmc_free_host(struct mmc_host *host) | |
873 | { | |
874 | flush_scheduled_work(); | |
875 | kfree(host); | |
876 | } | |
877 | ||
878 | EXPORT_SYMBOL(mmc_free_host); | |
879 | ||
880 | #ifdef CONFIG_PM | |
881 | ||
882 | /** | |
883 | * mmc_suspend_host - suspend a host | |
884 | * @host: mmc host | |
885 | * @state: suspend mode (PM_SUSPEND_xxx) | |
886 | */ | |
887 | int mmc_suspend_host(struct mmc_host *host, u32 state) | |
888 | { | |
889 | mmc_claim_host(host); | |
890 | mmc_deselect_cards(host); | |
891 | mmc_power_off(host); | |
892 | mmc_release_host(host); | |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
897 | EXPORT_SYMBOL(mmc_suspend_host); | |
898 | ||
899 | /** | |
900 | * mmc_resume_host - resume a previously suspended host | |
901 | * @host: mmc host | |
902 | */ | |
903 | int mmc_resume_host(struct mmc_host *host) | |
904 | { | |
905 | mmc_detect_change(host); | |
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
910 | EXPORT_SYMBOL(mmc_resume_host); | |
911 | ||
912 | #endif | |
913 | ||
914 | MODULE_LICENSE("GPL"); |