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1da177e4 LT |
1 | /* |
2 | * linux/drivers/mmc/mmc.c | |
3 | * | |
4 | * Copyright (C) 2003-2004 Russell King, All Rights Reserved. | |
5b4fd9ae PO |
5 | * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. |
6 | * SD support Copyright (C) 2005 Pierre Ossman, All Rights Reserved. | |
1da177e4 LT |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/err.h> | |
b57c43ad PO |
20 | #include <asm/scatterlist.h> |
21 | #include <linux/scatterlist.h> | |
1da177e4 LT |
22 | |
23 | #include <linux/mmc/card.h> | |
24 | #include <linux/mmc/host.h> | |
25 | #include <linux/mmc/protocol.h> | |
26 | ||
27 | #include "mmc.h" | |
28 | ||
1da177e4 LT |
29 | #define CMD_RETRIES 3 |
30 | ||
31 | /* | |
32 | * OCR Bit positions to 10s of Vdd mV. | |
33 | */ | |
34 | static const unsigned short mmc_ocr_bit_to_vdd[] = { | |
35 | 150, 155, 160, 165, 170, 180, 190, 200, | |
36 | 210, 220, 230, 240, 250, 260, 270, 280, | |
37 | 290, 300, 310, 320, 330, 340, 350, 360 | |
38 | }; | |
39 | ||
40 | static const unsigned int tran_exp[] = { | |
41 | 10000, 100000, 1000000, 10000000, | |
42 | 0, 0, 0, 0 | |
43 | }; | |
44 | ||
45 | static const unsigned char tran_mant[] = { | |
46 | 0, 10, 12, 13, 15, 20, 25, 30, | |
47 | 35, 40, 45, 50, 55, 60, 70, 80, | |
48 | }; | |
49 | ||
50 | static const unsigned int tacc_exp[] = { | |
51 | 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, | |
52 | }; | |
53 | ||
54 | static const unsigned int tacc_mant[] = { | |
55 | 0, 10, 12, 13, 15, 20, 25, 30, | |
56 | 35, 40, 45, 50, 55, 60, 70, 80, | |
57 | }; | |
58 | ||
59 | ||
60 | /** | |
fe10c6ab RK |
61 | * mmc_request_done - finish processing an MMC request |
62 | * @host: MMC host which completed request | |
63 | * @mrq: MMC request which request | |
1da177e4 LT |
64 | * |
65 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 66 | * their processing of a request. |
1da177e4 LT |
67 | */ |
68 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
69 | { | |
70 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
71 | int err = cmd->error; |
72 | ||
73 | pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n", | |
74 | mmc_hostname(host), cmd->opcode, err, | |
75 | mrq->data ? mrq->data->error : 0, | |
76 | mrq->stop ? mrq->stop->error : 0, | |
77 | cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); | |
1da177e4 LT |
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 | { | |
920e70c5 RK |
101 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
102 | mmc_hostname(host), mrq->cmd->opcode, | |
103 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 LT |
104 | |
105 | WARN_ON(host->card_busy == NULL); | |
106 | ||
107 | mrq->cmd->error = 0; | |
108 | mrq->cmd->mrq = mrq; | |
109 | if (mrq->data) { | |
110 | mrq->cmd->data = mrq->data; | |
111 | mrq->data->error = 0; | |
112 | mrq->data->mrq = mrq; | |
113 | if (mrq->stop) { | |
114 | mrq->data->stop = mrq->stop; | |
115 | mrq->stop->error = 0; | |
116 | mrq->stop->mrq = mrq; | |
117 | } | |
118 | } | |
119 | host->ops->request(host, mrq); | |
120 | } | |
121 | ||
122 | EXPORT_SYMBOL(mmc_start_request); | |
123 | ||
124 | static void mmc_wait_done(struct mmc_request *mrq) | |
125 | { | |
126 | complete(mrq->done_data); | |
127 | } | |
128 | ||
129 | int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
130 | { | |
131 | DECLARE_COMPLETION(complete); | |
132 | ||
133 | mrq->done_data = &complete; | |
134 | mrq->done = mmc_wait_done; | |
135 | ||
136 | mmc_start_request(host, mrq); | |
137 | ||
138 | wait_for_completion(&complete); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | EXPORT_SYMBOL(mmc_wait_for_req); | |
144 | ||
145 | /** | |
146 | * mmc_wait_for_cmd - start a command and wait for completion | |
147 | * @host: MMC host to start command | |
148 | * @cmd: MMC command to start | |
149 | * @retries: maximum number of retries | |
150 | * | |
151 | * Start a new MMC command for a host, and wait for the command | |
152 | * to complete. Return any error that occurred while the command | |
153 | * was executing. Do not attempt to parse the response. | |
154 | */ | |
155 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
156 | { | |
157 | struct mmc_request mrq; | |
158 | ||
159 | BUG_ON(host->card_busy == NULL); | |
160 | ||
161 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
162 | ||
163 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
164 | cmd->retries = retries; | |
165 | ||
166 | mrq.cmd = cmd; | |
167 | cmd->data = NULL; | |
168 | ||
169 | mmc_wait_for_req(host, &mrq); | |
170 | ||
171 | return cmd->error; | |
172 | } | |
173 | ||
174 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
175 | ||
335eadf2 PO |
176 | /** |
177 | * mmc_wait_for_app_cmd - start an application command and wait for | |
178 | completion | |
179 | * @host: MMC host to start command | |
180 | * @rca: RCA to send MMC_APP_CMD to | |
181 | * @cmd: MMC command to start | |
182 | * @retries: maximum number of retries | |
183 | * | |
184 | * Sends a MMC_APP_CMD, checks the card response, sends the command | |
185 | * in the parameter and waits for it to complete. Return any error | |
186 | * that occurred while the command was executing. Do not attempt to | |
187 | * parse the response. | |
188 | */ | |
189 | int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca, | |
190 | struct mmc_command *cmd, int retries) | |
191 | { | |
192 | struct mmc_request mrq; | |
193 | struct mmc_command appcmd; | |
194 | ||
195 | int i, err; | |
196 | ||
197 | BUG_ON(host->card_busy == NULL); | |
198 | BUG_ON(retries < 0); | |
199 | ||
200 | err = MMC_ERR_INVALID; | |
201 | ||
202 | /* | |
203 | * We have to resend MMC_APP_CMD for each attempt so | |
204 | * we cannot use the retries field in mmc_command. | |
205 | */ | |
206 | for (i = 0;i <= retries;i++) { | |
207 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
208 | ||
209 | appcmd.opcode = MMC_APP_CMD; | |
210 | appcmd.arg = rca << 16; | |
e9225176 | 211 | appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
335eadf2 PO |
212 | appcmd.retries = 0; |
213 | memset(appcmd.resp, 0, sizeof(appcmd.resp)); | |
214 | appcmd.data = NULL; | |
215 | ||
216 | mrq.cmd = &appcmd; | |
217 | appcmd.data = NULL; | |
218 | ||
219 | mmc_wait_for_req(host, &mrq); | |
220 | ||
221 | if (appcmd.error) { | |
222 | err = appcmd.error; | |
223 | continue; | |
224 | } | |
225 | ||
226 | /* Check that card supported application commands */ | |
227 | if (!(appcmd.resp[0] & R1_APP_CMD)) | |
228 | return MMC_ERR_FAILED; | |
229 | ||
230 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
231 | ||
232 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
233 | cmd->retries = 0; | |
234 | ||
235 | mrq.cmd = cmd; | |
236 | cmd->data = NULL; | |
1da177e4 | 237 | |
335eadf2 PO |
238 | mmc_wait_for_req(host, &mrq); |
239 | ||
240 | err = cmd->error; | |
241 | if (cmd->error == MMC_ERR_NONE) | |
242 | break; | |
243 | } | |
244 | ||
245 | return err; | |
246 | } | |
247 | ||
248 | EXPORT_SYMBOL(mmc_wait_for_app_cmd); | |
1da177e4 | 249 | |
b57c43ad PO |
250 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card); |
251 | ||
1da177e4 LT |
252 | /** |
253 | * __mmc_claim_host - exclusively claim a host | |
254 | * @host: mmc host to claim | |
255 | * @card: mmc card to claim host for | |
256 | * | |
257 | * Claim a host for a set of operations. If a valid card | |
258 | * is passed and this wasn't the last card selected, select | |
259 | * the card before returning. | |
260 | * | |
261 | * Note: you should use mmc_card_claim_host or mmc_claim_host. | |
262 | */ | |
263 | int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card) | |
264 | { | |
265 | DECLARE_WAITQUEUE(wait, current); | |
266 | unsigned long flags; | |
267 | int err = 0; | |
268 | ||
269 | add_wait_queue(&host->wq, &wait); | |
270 | spin_lock_irqsave(&host->lock, flags); | |
271 | while (1) { | |
272 | set_current_state(TASK_UNINTERRUPTIBLE); | |
273 | if (host->card_busy == NULL) | |
274 | break; | |
275 | spin_unlock_irqrestore(&host->lock, flags); | |
276 | schedule(); | |
277 | spin_lock_irqsave(&host->lock, flags); | |
278 | } | |
279 | set_current_state(TASK_RUNNING); | |
280 | host->card_busy = card; | |
281 | spin_unlock_irqrestore(&host->lock, flags); | |
282 | remove_wait_queue(&host->wq, &wait); | |
283 | ||
b57c43ad PO |
284 | if (card != (void *)-1) { |
285 | err = mmc_select_card(host, card); | |
286 | if (err != MMC_ERR_NONE) | |
287 | return err; | |
1da177e4 LT |
288 | } |
289 | ||
290 | return err; | |
291 | } | |
292 | ||
293 | EXPORT_SYMBOL(__mmc_claim_host); | |
294 | ||
295 | /** | |
296 | * mmc_release_host - release a host | |
297 | * @host: mmc host to release | |
298 | * | |
299 | * Release a MMC host, allowing others to claim the host | |
300 | * for their operations. | |
301 | */ | |
302 | void mmc_release_host(struct mmc_host *host) | |
303 | { | |
304 | unsigned long flags; | |
305 | ||
306 | BUG_ON(host->card_busy == NULL); | |
307 | ||
308 | spin_lock_irqsave(&host->lock, flags); | |
309 | host->card_busy = NULL; | |
310 | spin_unlock_irqrestore(&host->lock, flags); | |
311 | ||
312 | wake_up(&host->wq); | |
313 | } | |
314 | ||
315 | EXPORT_SYMBOL(mmc_release_host); | |
316 | ||
920e70c5 RK |
317 | static inline void mmc_set_ios(struct mmc_host *host) |
318 | { | |
319 | struct mmc_ios *ios = &host->ios; | |
320 | ||
321 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u width %u\n", | |
322 | mmc_hostname(host), ios->clock, ios->bus_mode, | |
323 | ios->power_mode, ios->chip_select, ios->vdd, | |
324 | ios->bus_width); | |
325 | ||
326 | host->ops->set_ios(host, ios); | |
327 | } | |
328 | ||
b57c43ad PO |
329 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card) |
330 | { | |
331 | int err; | |
332 | struct mmc_command cmd; | |
333 | ||
334 | BUG_ON(host->card_busy == NULL); | |
335 | ||
336 | if (host->card_selected == card) | |
337 | return MMC_ERR_NONE; | |
338 | ||
339 | host->card_selected = card; | |
340 | ||
341 | cmd.opcode = MMC_SELECT_CARD; | |
342 | cmd.arg = card->rca << 16; | |
e9225176 | 343 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
b57c43ad PO |
344 | |
345 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
346 | if (err != MMC_ERR_NONE) | |
347 | return err; | |
348 | ||
f218278a PO |
349 | /* |
350 | * Default bus width is 1 bit. | |
351 | */ | |
352 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
353 | ||
354 | /* | |
355 | * We can only change the bus width of the selected | |
356 | * card so therefore we have to put the handling | |
357 | * here. | |
358 | */ | |
359 | if (host->caps & MMC_CAP_4_BIT_DATA) { | |
360 | /* | |
361 | * The card is in 1 bit mode by default so | |
362 | * we only need to change if it supports the | |
363 | * wider version. | |
364 | */ | |
365 | if (mmc_card_sd(card) && | |
366 | (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { | |
367 | struct mmc_command cmd; | |
368 | cmd.opcode = SD_APP_SET_BUS_WIDTH; | |
369 | cmd.arg = SD_BUS_WIDTH_4; | |
e9225176 | 370 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
f218278a PO |
371 | |
372 | err = mmc_wait_for_app_cmd(host, card->rca, &cmd, | |
373 | CMD_RETRIES); | |
374 | if (err != MMC_ERR_NONE) | |
375 | return err; | |
376 | ||
377 | host->ios.bus_width = MMC_BUS_WIDTH_4; | |
378 | } | |
379 | } | |
380 | ||
920e70c5 | 381 | mmc_set_ios(host); |
f218278a | 382 | |
b57c43ad PO |
383 | return MMC_ERR_NONE; |
384 | } | |
385 | ||
1da177e4 LT |
386 | /* |
387 | * Ensure that no card is selected. | |
388 | */ | |
389 | static void mmc_deselect_cards(struct mmc_host *host) | |
390 | { | |
391 | struct mmc_command cmd; | |
392 | ||
393 | if (host->card_selected) { | |
394 | host->card_selected = NULL; | |
395 | ||
396 | cmd.opcode = MMC_SELECT_CARD; | |
397 | cmd.arg = 0; | |
e9225176 | 398 | cmd.flags = MMC_RSP_NONE | MMC_CMD_AC; |
1da177e4 LT |
399 | |
400 | mmc_wait_for_cmd(host, &cmd, 0); | |
401 | } | |
402 | } | |
403 | ||
404 | ||
405 | static inline void mmc_delay(unsigned int ms) | |
406 | { | |
407 | if (ms < HZ / 1000) { | |
408 | yield(); | |
409 | mdelay(ms); | |
410 | } else { | |
411 | msleep_interruptible (ms); | |
412 | } | |
413 | } | |
414 | ||
415 | /* | |
416 | * Mask off any voltages we don't support and select | |
417 | * the lowest voltage | |
418 | */ | |
419 | static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) | |
420 | { | |
421 | int bit; | |
422 | ||
423 | ocr &= host->ocr_avail; | |
424 | ||
425 | bit = ffs(ocr); | |
426 | if (bit) { | |
427 | bit -= 1; | |
428 | ||
429 | ocr = 3 << bit; | |
430 | ||
431 | host->ios.vdd = bit; | |
920e70c5 | 432 | mmc_set_ios(host); |
1da177e4 LT |
433 | } else { |
434 | ocr = 0; | |
435 | } | |
436 | ||
437 | return ocr; | |
438 | } | |
439 | ||
440 | #define UNSTUFF_BITS(resp,start,size) \ | |
441 | ({ \ | |
442 | const int __size = size; \ | |
443 | const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ | |
444 | const int __off = 3 - ((start) / 32); \ | |
445 | const int __shft = (start) & 31; \ | |
446 | u32 __res; \ | |
447 | \ | |
448 | __res = resp[__off] >> __shft; \ | |
449 | if (__size + __shft > 32) \ | |
450 | __res |= resp[__off-1] << ((32 - __shft) % 32); \ | |
451 | __res & __mask; \ | |
452 | }) | |
453 | ||
454 | /* | |
455 | * Given the decoded CSD structure, decode the raw CID to our CID structure. | |
456 | */ | |
457 | static void mmc_decode_cid(struct mmc_card *card) | |
458 | { | |
459 | u32 *resp = card->raw_cid; | |
460 | ||
461 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
462 | ||
335eadf2 PO |
463 | if (mmc_card_sd(card)) { |
464 | /* | |
465 | * SD doesn't currently have a version field so we will | |
466 | * have to assume we can parse this. | |
467 | */ | |
468 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
469 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
470 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
471 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
472 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
473 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
474 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
475 | card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); | |
476 | card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); | |
477 | card->cid.serial = UNSTUFF_BITS(resp, 24, 32); | |
478 | card->cid.year = UNSTUFF_BITS(resp, 12, 8); | |
479 | card->cid.month = UNSTUFF_BITS(resp, 8, 4); | |
480 | ||
481 | card->cid.year += 2000; /* SD cards year offset */ | |
a00fc090 | 482 | } else { |
335eadf2 PO |
483 | /* |
484 | * The selection of the format here is based upon published | |
485 | * specs from sandisk and from what people have reported. | |
486 | */ | |
487 | switch (card->csd.mmca_vsn) { | |
488 | case 0: /* MMC v1.0 - v1.2 */ | |
489 | case 1: /* MMC v1.4 */ | |
490 | card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); | |
491 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
492 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
493 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
494 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
495 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
496 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
497 | card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); | |
498 | card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); | |
499 | card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); | |
500 | card->cid.serial = UNSTUFF_BITS(resp, 16, 24); | |
501 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
502 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
503 | break; | |
504 | ||
505 | case 2: /* MMC v2.0 - v2.2 */ | |
506 | case 3: /* MMC v3.1 - v3.3 */ | |
cb757b4e | 507 | case 4: /* MMC v4 */ |
335eadf2 PO |
508 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); |
509 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
510 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
511 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
512 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
513 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
514 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
515 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
516 | card->cid.serial = UNSTUFF_BITS(resp, 16, 32); | |
517 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
518 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
519 | break; | |
520 | ||
521 | default: | |
522 | printk("%s: card has unknown MMCA version %d\n", | |
523 | mmc_hostname(card->host), card->csd.mmca_vsn); | |
524 | mmc_card_set_bad(card); | |
525 | break; | |
526 | } | |
1da177e4 LT |
527 | } |
528 | } | |
529 | ||
530 | /* | |
531 | * Given a 128-bit response, decode to our card CSD structure. | |
532 | */ | |
533 | static void mmc_decode_csd(struct mmc_card *card) | |
534 | { | |
535 | struct mmc_csd *csd = &card->csd; | |
536 | unsigned int e, m, csd_struct; | |
537 | u32 *resp = card->raw_csd; | |
538 | ||
335eadf2 PO |
539 | if (mmc_card_sd(card)) { |
540 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
541 | if (csd_struct != 0) { | |
542 | printk("%s: unrecognised CSD structure version %d\n", | |
543 | mmc_hostname(card->host), csd_struct); | |
544 | mmc_card_set_bad(card); | |
545 | return; | |
546 | } | |
547 | ||
548 | m = UNSTUFF_BITS(resp, 115, 4); | |
549 | e = UNSTUFF_BITS(resp, 112, 3); | |
550 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
551 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
552 | ||
553 | m = UNSTUFF_BITS(resp, 99, 4); | |
554 | e = UNSTUFF_BITS(resp, 96, 3); | |
555 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
556 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
557 | ||
558 | e = UNSTUFF_BITS(resp, 47, 3); | |
559 | m = UNSTUFF_BITS(resp, 62, 12); | |
560 | csd->capacity = (1 + m) << (e + 2); | |
561 | ||
562 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
a6f6c96b RK |
563 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
564 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
565 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
37be4e78 | 566 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
a6f6c96b RK |
567 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
568 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
a00fc090 | 569 | } else { |
335eadf2 PO |
570 | /* |
571 | * We only understand CSD structure v1.1 and v1.2. | |
572 | * v1.2 has extra information in bits 15, 11 and 10. | |
573 | */ | |
574 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
575 | if (csd_struct != 1 && csd_struct != 2) { | |
576 | printk("%s: unrecognised CSD structure version %d\n", | |
577 | mmc_hostname(card->host), csd_struct); | |
578 | mmc_card_set_bad(card); | |
579 | return; | |
580 | } | |
1da177e4 | 581 | |
335eadf2 PO |
582 | csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); |
583 | m = UNSTUFF_BITS(resp, 115, 4); | |
584 | e = UNSTUFF_BITS(resp, 112, 3); | |
585 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
586 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
1da177e4 | 587 | |
335eadf2 PO |
588 | m = UNSTUFF_BITS(resp, 99, 4); |
589 | e = UNSTUFF_BITS(resp, 96, 3); | |
590 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
591 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
1da177e4 | 592 | |
335eadf2 PO |
593 | e = UNSTUFF_BITS(resp, 47, 3); |
594 | m = UNSTUFF_BITS(resp, 62, 12); | |
595 | csd->capacity = (1 + m) << (e + 2); | |
1da177e4 | 596 | |
335eadf2 | 597 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
a6f6c96b RK |
598 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
599 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
600 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
37be4e78 | 601 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
a6f6c96b RK |
602 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
603 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
335eadf2 | 604 | } |
1da177e4 LT |
605 | } |
606 | ||
b57c43ad PO |
607 | /* |
608 | * Given a 64-bit response, decode to our card SCR structure. | |
609 | */ | |
610 | static void mmc_decode_scr(struct mmc_card *card) | |
611 | { | |
612 | struct sd_scr *scr = &card->scr; | |
613 | unsigned int scr_struct; | |
614 | u32 resp[4]; | |
615 | ||
616 | BUG_ON(!mmc_card_sd(card)); | |
617 | ||
618 | resp[3] = card->raw_scr[1]; | |
619 | resp[2] = card->raw_scr[0]; | |
620 | ||
621 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
622 | if (scr_struct != 0) { | |
623 | printk("%s: unrecognised SCR structure version %d\n", | |
624 | mmc_hostname(card->host), scr_struct); | |
625 | mmc_card_set_bad(card); | |
626 | return; | |
627 | } | |
628 | ||
629 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
630 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
631 | } | |
632 | ||
1da177e4 LT |
633 | /* |
634 | * Locate a MMC card on this MMC host given a raw CID. | |
635 | */ | |
636 | static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid) | |
637 | { | |
638 | struct mmc_card *card; | |
639 | ||
640 | list_for_each_entry(card, &host->cards, node) { | |
641 | if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0) | |
642 | return card; | |
643 | } | |
644 | return NULL; | |
645 | } | |
646 | ||
647 | /* | |
648 | * Allocate a new MMC card, and assign a unique RCA. | |
649 | */ | |
650 | static struct mmc_card * | |
651 | mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca) | |
652 | { | |
653 | struct mmc_card *card, *c; | |
654 | unsigned int rca = *frca; | |
655 | ||
656 | card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); | |
657 | if (!card) | |
658 | return ERR_PTR(-ENOMEM); | |
659 | ||
660 | mmc_init_card(card, host); | |
661 | memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); | |
662 | ||
663 | again: | |
664 | list_for_each_entry(c, &host->cards, node) | |
665 | if (c->rca == rca) { | |
666 | rca++; | |
667 | goto again; | |
668 | } | |
669 | ||
670 | card->rca = rca; | |
671 | ||
672 | *frca = rca; | |
673 | ||
674 | return card; | |
675 | } | |
676 | ||
677 | /* | |
678 | * Tell attached cards to go to IDLE state | |
679 | */ | |
680 | static void mmc_idle_cards(struct mmc_host *host) | |
681 | { | |
682 | struct mmc_command cmd; | |
683 | ||
865e9f13 | 684 | host->ios.chip_select = MMC_CS_HIGH; |
920e70c5 | 685 | mmc_set_ios(host); |
865e9f13 PO |
686 | |
687 | mmc_delay(1); | |
688 | ||
1da177e4 LT |
689 | cmd.opcode = MMC_GO_IDLE_STATE; |
690 | cmd.arg = 0; | |
e9225176 | 691 | cmd.flags = MMC_RSP_NONE | MMC_CMD_BC; |
1da177e4 LT |
692 | |
693 | mmc_wait_for_cmd(host, &cmd, 0); | |
694 | ||
695 | mmc_delay(1); | |
865e9f13 PO |
696 | |
697 | host->ios.chip_select = MMC_CS_DONTCARE; | |
920e70c5 | 698 | mmc_set_ios(host); |
865e9f13 PO |
699 | |
700 | mmc_delay(1); | |
1da177e4 LT |
701 | } |
702 | ||
703 | /* | |
45f8245b RK |
704 | * Apply power to the MMC stack. This is a two-stage process. |
705 | * First, we enable power to the card without the clock running. | |
706 | * We then wait a bit for the power to stabilise. Finally, | |
707 | * enable the bus drivers and clock to the card. | |
708 | * | |
709 | * We must _NOT_ enable the clock prior to power stablising. | |
710 | * | |
711 | * If a host does all the power sequencing itself, ignore the | |
712 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
713 | */ |
714 | static void mmc_power_up(struct mmc_host *host) | |
715 | { | |
716 | int bit = fls(host->ocr_avail) - 1; | |
717 | ||
718 | host->ios.vdd = bit; | |
719 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 720 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 721 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 722 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
920e70c5 | 723 | mmc_set_ios(host); |
1da177e4 LT |
724 | |
725 | mmc_delay(1); | |
726 | ||
727 | host->ios.clock = host->f_min; | |
728 | host->ios.power_mode = MMC_POWER_ON; | |
920e70c5 | 729 | mmc_set_ios(host); |
1da177e4 LT |
730 | |
731 | mmc_delay(2); | |
732 | } | |
733 | ||
734 | static void mmc_power_off(struct mmc_host *host) | |
735 | { | |
736 | host->ios.clock = 0; | |
737 | host->ios.vdd = 0; | |
738 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 739 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 740 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 741 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
920e70c5 | 742 | mmc_set_ios(host); |
1da177e4 LT |
743 | } |
744 | ||
745 | static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) | |
746 | { | |
747 | struct mmc_command cmd; | |
748 | int i, err = 0; | |
749 | ||
750 | cmd.opcode = MMC_SEND_OP_COND; | |
751 | cmd.arg = ocr; | |
e9225176 | 752 | cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; |
1da177e4 LT |
753 | |
754 | for (i = 100; i; i--) { | |
755 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
756 | if (err != MMC_ERR_NONE) | |
757 | break; | |
758 | ||
759 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
760 | break; | |
761 | ||
762 | err = MMC_ERR_TIMEOUT; | |
763 | ||
764 | mmc_delay(10); | |
765 | } | |
766 | ||
767 | if (rocr) | |
768 | *rocr = cmd.resp[0]; | |
769 | ||
770 | return err; | |
771 | } | |
772 | ||
335eadf2 PO |
773 | static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) |
774 | { | |
775 | struct mmc_command cmd; | |
776 | int i, err = 0; | |
777 | ||
778 | cmd.opcode = SD_APP_OP_COND; | |
779 | cmd.arg = ocr; | |
e9225176 | 780 | cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; |
335eadf2 PO |
781 | |
782 | for (i = 100; i; i--) { | |
783 | err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES); | |
784 | if (err != MMC_ERR_NONE) | |
785 | break; | |
786 | ||
787 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
788 | break; | |
789 | ||
790 | err = MMC_ERR_TIMEOUT; | |
791 | ||
792 | mmc_delay(10); | |
793 | } | |
794 | ||
795 | if (rocr) | |
796 | *rocr = cmd.resp[0]; | |
797 | ||
798 | return err; | |
799 | } | |
800 | ||
1da177e4 LT |
801 | /* |
802 | * Discover cards by requesting their CID. If this command | |
803 | * times out, it is not an error; there are no further cards | |
804 | * to be discovered. Add new cards to the list. | |
805 | * | |
806 | * Create a mmc_card entry for each discovered card, assigning | |
807 | * it an RCA, and save the raw CID for decoding later. | |
808 | */ | |
809 | static void mmc_discover_cards(struct mmc_host *host) | |
810 | { | |
811 | struct mmc_card *card; | |
812 | unsigned int first_rca = 1, err; | |
813 | ||
814 | while (1) { | |
815 | struct mmc_command cmd; | |
816 | ||
817 | cmd.opcode = MMC_ALL_SEND_CID; | |
818 | cmd.arg = 0; | |
e9225176 | 819 | cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR; |
1da177e4 LT |
820 | |
821 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
822 | if (err == MMC_ERR_TIMEOUT) { | |
823 | err = MMC_ERR_NONE; | |
824 | break; | |
825 | } | |
826 | if (err != MMC_ERR_NONE) { | |
827 | printk(KERN_ERR "%s: error requesting CID: %d\n", | |
d366b643 | 828 | mmc_hostname(host), err); |
1da177e4 LT |
829 | break; |
830 | } | |
831 | ||
832 | card = mmc_find_card(host, cmd.resp); | |
833 | if (!card) { | |
834 | card = mmc_alloc_card(host, cmd.resp, &first_rca); | |
835 | if (IS_ERR(card)) { | |
836 | err = PTR_ERR(card); | |
837 | break; | |
838 | } | |
839 | list_add(&card->node, &host->cards); | |
840 | } | |
841 | ||
842 | card->state &= ~MMC_STATE_DEAD; | |
843 | ||
335eadf2 PO |
844 | if (host->mode == MMC_MODE_SD) { |
845 | mmc_card_set_sd(card); | |
1da177e4 | 846 | |
335eadf2 PO |
847 | cmd.opcode = SD_SEND_RELATIVE_ADDR; |
848 | cmd.arg = 0; | |
e9225176 | 849 | cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; |
335eadf2 PO |
850 | |
851 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
852 | if (err != MMC_ERR_NONE) | |
853 | mmc_card_set_dead(card); | |
a00fc090 | 854 | else { |
335eadf2 | 855 | card->rca = cmd.resp[0] >> 16; |
a00fc090 PO |
856 | |
857 | if (!host->ops->get_ro) { | |
858 | printk(KERN_WARNING "%s: host does not " | |
859 | "support reading read-only " | |
860 | "switch. assuming write-enable.\n", | |
861 | mmc_hostname(host)); | |
862 | } else { | |
863 | if (host->ops->get_ro(host)) | |
864 | mmc_card_set_readonly(card); | |
865 | } | |
866 | } | |
867 | } else { | |
335eadf2 PO |
868 | cmd.opcode = MMC_SET_RELATIVE_ADDR; |
869 | cmd.arg = card->rca << 16; | |
e9225176 | 870 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
335eadf2 PO |
871 | |
872 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
873 | if (err != MMC_ERR_NONE) | |
874 | mmc_card_set_dead(card); | |
875 | } | |
1da177e4 LT |
876 | } |
877 | } | |
878 | ||
879 | static void mmc_read_csds(struct mmc_host *host) | |
880 | { | |
881 | struct mmc_card *card; | |
882 | ||
883 | list_for_each_entry(card, &host->cards, node) { | |
884 | struct mmc_command cmd; | |
885 | int err; | |
886 | ||
887 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
888 | continue; | |
889 | ||
890 | cmd.opcode = MMC_SEND_CSD; | |
891 | cmd.arg = card->rca << 16; | |
e9225176 | 892 | cmd.flags = MMC_RSP_R2 | MMC_CMD_AC; |
1da177e4 LT |
893 | |
894 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
895 | if (err != MMC_ERR_NONE) { | |
896 | mmc_card_set_dead(card); | |
897 | continue; | |
898 | } | |
899 | ||
900 | memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd)); | |
901 | ||
902 | mmc_decode_csd(card); | |
903 | mmc_decode_cid(card); | |
904 | } | |
905 | } | |
906 | ||
b57c43ad PO |
907 | static void mmc_read_scrs(struct mmc_host *host) |
908 | { | |
909 | int err; | |
910 | struct mmc_card *card; | |
911 | ||
912 | struct mmc_request mrq; | |
913 | struct mmc_command cmd; | |
914 | struct mmc_data data; | |
915 | ||
916 | struct scatterlist sg; | |
917 | ||
918 | list_for_each_entry(card, &host->cards, node) { | |
919 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
920 | continue; | |
921 | if (!mmc_card_sd(card)) | |
922 | continue; | |
923 | ||
924 | err = mmc_select_card(host, card); | |
925 | if (err != MMC_ERR_NONE) { | |
926 | mmc_card_set_dead(card); | |
927 | continue; | |
928 | } | |
929 | ||
930 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
931 | ||
932 | cmd.opcode = MMC_APP_CMD; | |
933 | cmd.arg = card->rca << 16; | |
e9225176 | 934 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
b57c43ad PO |
935 | |
936 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
937 | if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) { | |
938 | mmc_card_set_dead(card); | |
939 | continue; | |
940 | } | |
941 | ||
942 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
943 | ||
944 | cmd.opcode = SD_APP_SEND_SCR; | |
945 | cmd.arg = 0; | |
e9225176 | 946 | cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; |
b57c43ad PO |
947 | |
948 | memset(&data, 0, sizeof(struct mmc_data)); | |
949 | ||
950 | data.timeout_ns = card->csd.tacc_ns * 10; | |
951 | data.timeout_clks = card->csd.tacc_clks * 10; | |
952 | data.blksz_bits = 3; | |
2c171bf1 | 953 | data.blksz = 1 << 3; |
b57c43ad PO |
954 | data.blocks = 1; |
955 | data.flags = MMC_DATA_READ; | |
956 | data.sg = &sg; | |
957 | data.sg_len = 1; | |
958 | ||
959 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
960 | ||
961 | mrq.cmd = &cmd; | |
962 | mrq.data = &data; | |
963 | ||
964 | sg_init_one(&sg, (u8*)card->raw_scr, 8); | |
965 | ||
e781de44 PO |
966 | mmc_wait_for_req(host, &mrq); |
967 | ||
968 | if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { | |
b57c43ad PO |
969 | mmc_card_set_dead(card); |
970 | continue; | |
971 | } | |
972 | ||
973 | card->raw_scr[0] = ntohl(card->raw_scr[0]); | |
974 | card->raw_scr[1] = ntohl(card->raw_scr[1]); | |
975 | ||
976 | mmc_decode_scr(card); | |
977 | } | |
978 | ||
979 | mmc_deselect_cards(host); | |
980 | } | |
981 | ||
1da177e4 LT |
982 | static unsigned int mmc_calculate_clock(struct mmc_host *host) |
983 | { | |
984 | struct mmc_card *card; | |
985 | unsigned int max_dtr = host->f_max; | |
986 | ||
987 | list_for_each_entry(card, &host->cards, node) | |
988 | if (!mmc_card_dead(card) && max_dtr > card->csd.max_dtr) | |
989 | max_dtr = card->csd.max_dtr; | |
990 | ||
920e70c5 RK |
991 | pr_debug("%s: selected %d.%03dMHz transfer rate\n", |
992 | mmc_hostname(host), | |
c6563178 | 993 | max_dtr / 1000000, (max_dtr / 1000) % 1000); |
1da177e4 LT |
994 | |
995 | return max_dtr; | |
996 | } | |
997 | ||
998 | /* | |
999 | * Check whether cards we already know about are still present. | |
1000 | * We do this by requesting status, and checking whether a card | |
1001 | * responds. | |
1002 | * | |
1003 | * A request for status does not cause a state change in data | |
1004 | * transfer mode. | |
1005 | */ | |
1006 | static void mmc_check_cards(struct mmc_host *host) | |
1007 | { | |
1008 | struct list_head *l, *n; | |
1009 | ||
1010 | mmc_deselect_cards(host); | |
1011 | ||
1012 | list_for_each_safe(l, n, &host->cards) { | |
1013 | struct mmc_card *card = mmc_list_to_card(l); | |
1014 | struct mmc_command cmd; | |
1015 | int err; | |
1016 | ||
1017 | cmd.opcode = MMC_SEND_STATUS; | |
1018 | cmd.arg = card->rca << 16; | |
e9225176 | 1019 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
1da177e4 LT |
1020 | |
1021 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
1022 | if (err == MMC_ERR_NONE) | |
1023 | continue; | |
1024 | ||
1025 | mmc_card_set_dead(card); | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | static void mmc_setup(struct mmc_host *host) | |
1030 | { | |
1031 | if (host->ios.power_mode != MMC_POWER_ON) { | |
1032 | int err; | |
1033 | u32 ocr; | |
1034 | ||
a00fc090 | 1035 | host->mode = MMC_MODE_SD; |
335eadf2 | 1036 | |
1da177e4 LT |
1037 | mmc_power_up(host); |
1038 | mmc_idle_cards(host); | |
1039 | ||
a00fc090 | 1040 | err = mmc_send_app_op_cond(host, 0, &ocr); |
335eadf2 PO |
1041 | |
1042 | /* | |
a00fc090 PO |
1043 | * If we fail to detect any SD cards then try |
1044 | * searching for MMC cards. | |
335eadf2 | 1045 | */ |
a00fc090 PO |
1046 | if (err != MMC_ERR_NONE) { |
1047 | host->mode = MMC_MODE_MMC; | |
1048 | ||
1049 | err = mmc_send_op_cond(host, 0, &ocr); | |
335eadf2 PO |
1050 | if (err != MMC_ERR_NONE) |
1051 | return; | |
335eadf2 | 1052 | } |
1da177e4 LT |
1053 | |
1054 | host->ocr = mmc_select_voltage(host, ocr); | |
1055 | ||
1056 | /* | |
1057 | * Since we're changing the OCR value, we seem to | |
1058 | * need to tell some cards to go back to the idle | |
1059 | * state. We wait 1ms to give cards time to | |
1060 | * respond. | |
1061 | */ | |
1062 | if (host->ocr) | |
1063 | mmc_idle_cards(host); | |
1064 | } else { | |
1065 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1066 | host->ios.clock = host->f_min; | |
920e70c5 | 1067 | mmc_set_ios(host); |
1da177e4 LT |
1068 | |
1069 | /* | |
1070 | * We should remember the OCR mask from the existing | |
1071 | * cards, and detect the new cards OCR mask, combine | |
1072 | * the two and re-select the VDD. However, if we do | |
1073 | * change VDD, we should do an idle, and then do a | |
1074 | * full re-initialisation. We would need to notify | |
1075 | * drivers so that they can re-setup the cards as | |
1076 | * well, while keeping their queues at bay. | |
1077 | * | |
1078 | * For the moment, we take the easy way out - if the | |
1079 | * new cards don't like our currently selected VDD, | |
1080 | * they drop off the bus. | |
1081 | */ | |
1082 | } | |
1083 | ||
1084 | if (host->ocr == 0) | |
1085 | return; | |
1086 | ||
1087 | /* | |
1088 | * Send the selected OCR multiple times... until the cards | |
1089 | * all get the idea that they should be ready for CMD2. | |
1090 | * (My SanDisk card seems to need this.) | |
1091 | */ | |
335eadf2 PO |
1092 | if (host->mode == MMC_MODE_SD) |
1093 | mmc_send_app_op_cond(host, host->ocr, NULL); | |
1094 | else | |
1095 | mmc_send_op_cond(host, host->ocr, NULL); | |
1da177e4 LT |
1096 | |
1097 | mmc_discover_cards(host); | |
1098 | ||
1099 | /* | |
1100 | * Ok, now switch to push-pull mode. | |
1101 | */ | |
1102 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
920e70c5 | 1103 | mmc_set_ios(host); |
1da177e4 LT |
1104 | |
1105 | mmc_read_csds(host); | |
b57c43ad PO |
1106 | |
1107 | if (host->mode == MMC_MODE_SD) | |
1108 | mmc_read_scrs(host); | |
1da177e4 LT |
1109 | } |
1110 | ||
1111 | ||
1112 | /** | |
1113 | * mmc_detect_change - process change of state on a MMC socket | |
1114 | * @host: host which changed state. | |
8dc00335 | 1115 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 LT |
1116 | * |
1117 | * All we know is that card(s) have been inserted or removed | |
1118 | * from the socket(s). We don't know which socket or cards. | |
1119 | */ | |
8dc00335 | 1120 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1121 | { |
8dc00335 RP |
1122 | if (delay) |
1123 | schedule_delayed_work(&host->detect, delay); | |
1124 | else | |
1125 | schedule_work(&host->detect); | |
1da177e4 LT |
1126 | } |
1127 | ||
1128 | EXPORT_SYMBOL(mmc_detect_change); | |
1129 | ||
1130 | ||
1131 | static void mmc_rescan(void *data) | |
1132 | { | |
1133 | struct mmc_host *host = data; | |
1134 | struct list_head *l, *n; | |
1135 | ||
1136 | mmc_claim_host(host); | |
1137 | ||
1138 | if (host->ios.power_mode == MMC_POWER_ON) | |
1139 | mmc_check_cards(host); | |
1140 | ||
1141 | mmc_setup(host); | |
1142 | ||
1143 | if (!list_empty(&host->cards)) { | |
1144 | /* | |
1145 | * (Re-)calculate the fastest clock rate which the | |
1146 | * attached cards and the host support. | |
1147 | */ | |
1148 | host->ios.clock = mmc_calculate_clock(host); | |
920e70c5 | 1149 | mmc_set_ios(host); |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | mmc_release_host(host); | |
1153 | ||
1154 | list_for_each_safe(l, n, &host->cards) { | |
1155 | struct mmc_card *card = mmc_list_to_card(l); | |
1156 | ||
1157 | /* | |
1158 | * If this is a new and good card, register it. | |
1159 | */ | |
1160 | if (!mmc_card_present(card) && !mmc_card_dead(card)) { | |
1161 | if (mmc_register_card(card)) | |
1162 | mmc_card_set_dead(card); | |
1163 | else | |
1164 | mmc_card_set_present(card); | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * If this card is dead, destroy it. | |
1169 | */ | |
1170 | if (mmc_card_dead(card)) { | |
1171 | list_del(&card->node); | |
1172 | mmc_remove_card(card); | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * If we discover that there are no cards on the | |
1178 | * bus, turn off the clock and power down. | |
1179 | */ | |
1180 | if (list_empty(&host->cards)) | |
1181 | mmc_power_off(host); | |
1182 | } | |
1183 | ||
1184 | ||
1185 | /** | |
1186 | * mmc_alloc_host - initialise the per-host structure. | |
1187 | * @extra: sizeof private data structure | |
1188 | * @dev: pointer to host device model structure | |
1189 | * | |
1190 | * Initialise the per-host structure. | |
1191 | */ | |
1192 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
1193 | { | |
1194 | struct mmc_host *host; | |
1195 | ||
00b137cf | 1196 | host = mmc_alloc_host_sysfs(extra, dev); |
1da177e4 | 1197 | if (host) { |
1da177e4 LT |
1198 | spin_lock_init(&host->lock); |
1199 | init_waitqueue_head(&host->wq); | |
1200 | INIT_LIST_HEAD(&host->cards); | |
1201 | INIT_WORK(&host->detect, mmc_rescan, host); | |
1202 | ||
1da177e4 LT |
1203 | /* |
1204 | * By default, hosts do not support SGIO or large requests. | |
1205 | * They have to set these according to their abilities. | |
1206 | */ | |
1207 | host->max_hw_segs = 1; | |
1208 | host->max_phys_segs = 1; | |
1209 | host->max_sectors = 1 << (PAGE_CACHE_SHIFT - 9); | |
1210 | host->max_seg_size = PAGE_CACHE_SIZE; | |
1211 | } | |
1212 | ||
1213 | return host; | |
1214 | } | |
1215 | ||
1216 | EXPORT_SYMBOL(mmc_alloc_host); | |
1217 | ||
1218 | /** | |
1219 | * mmc_add_host - initialise host hardware | |
1220 | * @host: mmc host | |
1221 | */ | |
1222 | int mmc_add_host(struct mmc_host *host) | |
1223 | { | |
00b137cf | 1224 | int ret; |
1da177e4 | 1225 | |
00b137cf RK |
1226 | ret = mmc_add_host_sysfs(host); |
1227 | if (ret == 0) { | |
1228 | mmc_power_off(host); | |
8dc00335 | 1229 | mmc_detect_change(host, 0); |
00b137cf | 1230 | } |
1da177e4 | 1231 | |
00b137cf | 1232 | return ret; |
1da177e4 LT |
1233 | } |
1234 | ||
1235 | EXPORT_SYMBOL(mmc_add_host); | |
1236 | ||
1237 | /** | |
1238 | * mmc_remove_host - remove host hardware | |
1239 | * @host: mmc host | |
1240 | * | |
1241 | * Unregister and remove all cards associated with this host, | |
1242 | * and power down the MMC bus. | |
1243 | */ | |
1244 | void mmc_remove_host(struct mmc_host *host) | |
1245 | { | |
1246 | struct list_head *l, *n; | |
1247 | ||
1248 | list_for_each_safe(l, n, &host->cards) { | |
1249 | struct mmc_card *card = mmc_list_to_card(l); | |
1250 | ||
1251 | mmc_remove_card(card); | |
1252 | } | |
1253 | ||
1254 | mmc_power_off(host); | |
00b137cf | 1255 | mmc_remove_host_sysfs(host); |
1da177e4 LT |
1256 | } |
1257 | ||
1258 | EXPORT_SYMBOL(mmc_remove_host); | |
1259 | ||
1260 | /** | |
1261 | * mmc_free_host - free the host structure | |
1262 | * @host: mmc host | |
1263 | * | |
1264 | * Free the host once all references to it have been dropped. | |
1265 | */ | |
1266 | void mmc_free_host(struct mmc_host *host) | |
1267 | { | |
1268 | flush_scheduled_work(); | |
00b137cf | 1269 | mmc_free_host_sysfs(host); |
1da177e4 LT |
1270 | } |
1271 | ||
1272 | EXPORT_SYMBOL(mmc_free_host); | |
1273 | ||
1274 | #ifdef CONFIG_PM | |
1275 | ||
1276 | /** | |
1277 | * mmc_suspend_host - suspend a host | |
1278 | * @host: mmc host | |
1279 | * @state: suspend mode (PM_SUSPEND_xxx) | |
1280 | */ | |
e5378ca8 | 1281 | int mmc_suspend_host(struct mmc_host *host, pm_message_t state) |
1da177e4 LT |
1282 | { |
1283 | mmc_claim_host(host); | |
1284 | mmc_deselect_cards(host); | |
1285 | mmc_power_off(host); | |
1286 | mmc_release_host(host); | |
1287 | ||
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | EXPORT_SYMBOL(mmc_suspend_host); | |
1292 | ||
1293 | /** | |
1294 | * mmc_resume_host - resume a previously suspended host | |
1295 | * @host: mmc host | |
1296 | */ | |
1297 | int mmc_resume_host(struct mmc_host *host) | |
1298 | { | |
896937ad | 1299 | mmc_rescan(host); |
1da177e4 LT |
1300 | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | EXPORT_SYMBOL(mmc_resume_host); | |
1305 | ||
1306 | #endif | |
1307 | ||
1308 | MODULE_LICENSE("GPL"); |