Commit | Line | Data |
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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. | |
bce40a36 | 7 | * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved. |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/completion.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/pagemap.h> | |
20 | #include <linux/err.h> | |
b57c43ad PO |
21 | #include <asm/scatterlist.h> |
22 | #include <linux/scatterlist.h> | |
1da177e4 LT |
23 | |
24 | #include <linux/mmc/card.h> | |
25 | #include <linux/mmc/host.h> | |
26 | #include <linux/mmc/protocol.h> | |
27 | ||
28 | #include "mmc.h" | |
29 | ||
1da177e4 LT |
30 | #define CMD_RETRIES 3 |
31 | ||
32 | /* | |
33 | * OCR Bit positions to 10s of Vdd mV. | |
34 | */ | |
35 | static const unsigned short mmc_ocr_bit_to_vdd[] = { | |
36 | 150, 155, 160, 165, 170, 180, 190, 200, | |
37 | 210, 220, 230, 240, 250, 260, 270, 280, | |
38 | 290, 300, 310, 320, 330, 340, 350, 360 | |
39 | }; | |
40 | ||
41 | static const unsigned int tran_exp[] = { | |
42 | 10000, 100000, 1000000, 10000000, | |
43 | 0, 0, 0, 0 | |
44 | }; | |
45 | ||
46 | static const unsigned char tran_mant[] = { | |
47 | 0, 10, 12, 13, 15, 20, 25, 30, | |
48 | 35, 40, 45, 50, 55, 60, 70, 80, | |
49 | }; | |
50 | ||
51 | static const unsigned int tacc_exp[] = { | |
52 | 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, | |
53 | }; | |
54 | ||
55 | static const unsigned int tacc_mant[] = { | |
56 | 0, 10, 12, 13, 15, 20, 25, 30, | |
57 | 35, 40, 45, 50, 55, 60, 70, 80, | |
58 | }; | |
59 | ||
60 | ||
61 | /** | |
fe10c6ab RK |
62 | * mmc_request_done - finish processing an MMC request |
63 | * @host: MMC host which completed request | |
64 | * @mrq: MMC request which request | |
1da177e4 LT |
65 | * |
66 | * MMC drivers should call this function when they have completed | |
fe10c6ab | 67 | * their processing of a request. |
1da177e4 LT |
68 | */ |
69 | void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) | |
70 | { | |
71 | struct mmc_command *cmd = mrq->cmd; | |
920e70c5 RK |
72 | int err = cmd->error; |
73 | ||
74 | pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n", | |
75 | mmc_hostname(host), cmd->opcode, err, | |
76 | mrq->data ? mrq->data->error : 0, | |
77 | mrq->stop ? mrq->stop->error : 0, | |
78 | cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]); | |
1da177e4 LT |
79 | |
80 | if (err && cmd->retries) { | |
81 | cmd->retries--; | |
82 | cmd->error = 0; | |
83 | host->ops->request(host, mrq); | |
84 | } else if (mrq->done) { | |
85 | mrq->done(mrq); | |
86 | } | |
87 | } | |
88 | ||
89 | EXPORT_SYMBOL(mmc_request_done); | |
90 | ||
91 | /** | |
92 | * mmc_start_request - start a command on a host | |
93 | * @host: MMC host to start command on | |
94 | * @mrq: MMC request to start | |
95 | * | |
96 | * Queue a command on the specified host. We expect the | |
97 | * caller to be holding the host lock with interrupts disabled. | |
98 | */ | |
99 | void | |
100 | mmc_start_request(struct mmc_host *host, struct mmc_request *mrq) | |
101 | { | |
976d9276 PO |
102 | #ifdef CONFIG_MMC_DEBUG |
103 | unsigned int i, sz; | |
104 | #endif | |
105 | ||
920e70c5 RK |
106 | pr_debug("%s: starting CMD%u arg %08x flags %08x\n", |
107 | mmc_hostname(host), mrq->cmd->opcode, | |
108 | mrq->cmd->arg, mrq->cmd->flags); | |
1da177e4 | 109 | |
f22ee4ed | 110 | WARN_ON(!host->claimed); |
1da177e4 LT |
111 | |
112 | mrq->cmd->error = 0; | |
113 | mrq->cmd->mrq = mrq; | |
114 | if (mrq->data) { | |
fe4a3c7a | 115 | BUG_ON(mrq->data->blksz > host->max_blk_size); |
55db890a PO |
116 | BUG_ON(mrq->data->blocks > host->max_blk_count); |
117 | BUG_ON(mrq->data->blocks * mrq->data->blksz > | |
118 | host->max_req_size); | |
fe4a3c7a | 119 | |
976d9276 PO |
120 | #ifdef CONFIG_MMC_DEBUG |
121 | sz = 0; | |
122 | for (i = 0;i < mrq->data->sg_len;i++) | |
123 | sz += mrq->data->sg[i].length; | |
124 | BUG_ON(sz != mrq->data->blocks * mrq->data->blksz); | |
125 | #endif | |
126 | ||
1da177e4 LT |
127 | mrq->cmd->data = mrq->data; |
128 | mrq->data->error = 0; | |
129 | mrq->data->mrq = mrq; | |
130 | if (mrq->stop) { | |
131 | mrq->data->stop = mrq->stop; | |
132 | mrq->stop->error = 0; | |
133 | mrq->stop->mrq = mrq; | |
134 | } | |
135 | } | |
136 | host->ops->request(host, mrq); | |
137 | } | |
138 | ||
139 | EXPORT_SYMBOL(mmc_start_request); | |
140 | ||
141 | static void mmc_wait_done(struct mmc_request *mrq) | |
142 | { | |
143 | complete(mrq->done_data); | |
144 | } | |
145 | ||
146 | int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq) | |
147 | { | |
0afffc72 | 148 | DECLARE_COMPLETION_ONSTACK(complete); |
1da177e4 LT |
149 | |
150 | mrq->done_data = &complete; | |
151 | mrq->done = mmc_wait_done; | |
152 | ||
153 | mmc_start_request(host, mrq); | |
154 | ||
155 | wait_for_completion(&complete); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | EXPORT_SYMBOL(mmc_wait_for_req); | |
161 | ||
162 | /** | |
163 | * mmc_wait_for_cmd - start a command and wait for completion | |
164 | * @host: MMC host to start command | |
165 | * @cmd: MMC command to start | |
166 | * @retries: maximum number of retries | |
167 | * | |
168 | * Start a new MMC command for a host, and wait for the command | |
169 | * to complete. Return any error that occurred while the command | |
170 | * was executing. Do not attempt to parse the response. | |
171 | */ | |
172 | int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries) | |
173 | { | |
174 | struct mmc_request mrq; | |
175 | ||
f22ee4ed | 176 | BUG_ON(!host->claimed); |
1da177e4 LT |
177 | |
178 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
179 | ||
180 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
181 | cmd->retries = retries; | |
182 | ||
183 | mrq.cmd = cmd; | |
184 | cmd->data = NULL; | |
185 | ||
186 | mmc_wait_for_req(host, &mrq); | |
187 | ||
188 | return cmd->error; | |
189 | } | |
190 | ||
191 | EXPORT_SYMBOL(mmc_wait_for_cmd); | |
192 | ||
335eadf2 PO |
193 | /** |
194 | * mmc_wait_for_app_cmd - start an application command and wait for | |
195 | completion | |
196 | * @host: MMC host to start command | |
197 | * @rca: RCA to send MMC_APP_CMD to | |
198 | * @cmd: MMC command to start | |
199 | * @retries: maximum number of retries | |
200 | * | |
201 | * Sends a MMC_APP_CMD, checks the card response, sends the command | |
202 | * in the parameter and waits for it to complete. Return any error | |
203 | * that occurred while the command was executing. Do not attempt to | |
204 | * parse the response. | |
205 | */ | |
206 | int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca, | |
207 | struct mmc_command *cmd, int retries) | |
208 | { | |
209 | struct mmc_request mrq; | |
210 | struct mmc_command appcmd; | |
211 | ||
212 | int i, err; | |
213 | ||
f22ee4ed | 214 | BUG_ON(!host->claimed); |
335eadf2 PO |
215 | BUG_ON(retries < 0); |
216 | ||
217 | err = MMC_ERR_INVALID; | |
218 | ||
219 | /* | |
220 | * We have to resend MMC_APP_CMD for each attempt so | |
221 | * we cannot use the retries field in mmc_command. | |
222 | */ | |
223 | for (i = 0;i <= retries;i++) { | |
224 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
225 | ||
226 | appcmd.opcode = MMC_APP_CMD; | |
227 | appcmd.arg = rca << 16; | |
e9225176 | 228 | appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
335eadf2 PO |
229 | appcmd.retries = 0; |
230 | memset(appcmd.resp, 0, sizeof(appcmd.resp)); | |
231 | appcmd.data = NULL; | |
232 | ||
233 | mrq.cmd = &appcmd; | |
234 | appcmd.data = NULL; | |
235 | ||
236 | mmc_wait_for_req(host, &mrq); | |
237 | ||
238 | if (appcmd.error) { | |
239 | err = appcmd.error; | |
240 | continue; | |
241 | } | |
242 | ||
243 | /* Check that card supported application commands */ | |
244 | if (!(appcmd.resp[0] & R1_APP_CMD)) | |
245 | return MMC_ERR_FAILED; | |
246 | ||
247 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
248 | ||
249 | memset(cmd->resp, 0, sizeof(cmd->resp)); | |
250 | cmd->retries = 0; | |
251 | ||
252 | mrq.cmd = cmd; | |
253 | cmd->data = NULL; | |
1da177e4 | 254 | |
335eadf2 PO |
255 | mmc_wait_for_req(host, &mrq); |
256 | ||
257 | err = cmd->error; | |
258 | if (cmd->error == MMC_ERR_NONE) | |
259 | break; | |
260 | } | |
261 | ||
262 | return err; | |
263 | } | |
264 | ||
265 | EXPORT_SYMBOL(mmc_wait_for_app_cmd); | |
1da177e4 | 266 | |
d773d725 RK |
267 | /** |
268 | * mmc_set_data_timeout - set the timeout for a data command | |
269 | * @data: data phase for command | |
270 | * @card: the MMC card associated with the data transfer | |
271 | * @write: flag to differentiate reads from writes | |
272 | */ | |
273 | void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card, | |
274 | int write) | |
275 | { | |
276 | unsigned int mult; | |
277 | ||
278 | /* | |
279 | * SD cards use a 100 multiplier rather than 10 | |
280 | */ | |
281 | mult = mmc_card_sd(card) ? 100 : 10; | |
282 | ||
283 | /* | |
284 | * Scale up the multiplier (and therefore the timeout) by | |
285 | * the r2w factor for writes. | |
286 | */ | |
287 | if (write) | |
288 | mult <<= card->csd.r2w_factor; | |
289 | ||
290 | data->timeout_ns = card->csd.tacc_ns * mult; | |
291 | data->timeout_clks = card->csd.tacc_clks * mult; | |
292 | ||
293 | /* | |
294 | * SD cards also have an upper limit on the timeout. | |
295 | */ | |
296 | if (mmc_card_sd(card)) { | |
297 | unsigned int timeout_us, limit_us; | |
298 | ||
299 | timeout_us = data->timeout_ns / 1000; | |
300 | timeout_us += data->timeout_clks * 1000 / | |
301 | (card->host->ios.clock / 1000); | |
302 | ||
303 | if (write) | |
304 | limit_us = 250000; | |
305 | else | |
306 | limit_us = 100000; | |
307 | ||
fba68bd2 PL |
308 | /* |
309 | * SDHC cards always use these fixed values. | |
310 | */ | |
311 | if (timeout_us > limit_us || mmc_card_blockaddr(card)) { | |
d773d725 RK |
312 | data->timeout_ns = limit_us * 1000; |
313 | data->timeout_clks = 0; | |
314 | } | |
315 | } | |
316 | } | |
317 | EXPORT_SYMBOL(mmc_set_data_timeout); | |
318 | ||
b57c43ad PO |
319 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card); |
320 | ||
1da177e4 LT |
321 | /** |
322 | * __mmc_claim_host - exclusively claim a host | |
323 | * @host: mmc host to claim | |
324 | * @card: mmc card to claim host for | |
325 | * | |
326 | * Claim a host for a set of operations. If a valid card | |
327 | * is passed and this wasn't the last card selected, select | |
328 | * the card before returning. | |
329 | * | |
330 | * Note: you should use mmc_card_claim_host or mmc_claim_host. | |
331 | */ | |
332 | int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card) | |
333 | { | |
334 | DECLARE_WAITQUEUE(wait, current); | |
335 | unsigned long flags; | |
336 | int err = 0; | |
337 | ||
338 | add_wait_queue(&host->wq, &wait); | |
339 | spin_lock_irqsave(&host->lock, flags); | |
340 | while (1) { | |
341 | set_current_state(TASK_UNINTERRUPTIBLE); | |
f22ee4ed | 342 | if (!host->claimed) |
1da177e4 LT |
343 | break; |
344 | spin_unlock_irqrestore(&host->lock, flags); | |
345 | schedule(); | |
346 | spin_lock_irqsave(&host->lock, flags); | |
347 | } | |
348 | set_current_state(TASK_RUNNING); | |
f22ee4ed | 349 | host->claimed = 1; |
1da177e4 LT |
350 | spin_unlock_irqrestore(&host->lock, flags); |
351 | remove_wait_queue(&host->wq, &wait); | |
352 | ||
b57c43ad PO |
353 | if (card != (void *)-1) { |
354 | err = mmc_select_card(host, card); | |
355 | if (err != MMC_ERR_NONE) | |
356 | return err; | |
1da177e4 LT |
357 | } |
358 | ||
359 | return err; | |
360 | } | |
361 | ||
362 | EXPORT_SYMBOL(__mmc_claim_host); | |
363 | ||
364 | /** | |
365 | * mmc_release_host - release a host | |
366 | * @host: mmc host to release | |
367 | * | |
368 | * Release a MMC host, allowing others to claim the host | |
369 | * for their operations. | |
370 | */ | |
371 | void mmc_release_host(struct mmc_host *host) | |
372 | { | |
373 | unsigned long flags; | |
374 | ||
f22ee4ed | 375 | BUG_ON(!host->claimed); |
1da177e4 LT |
376 | |
377 | spin_lock_irqsave(&host->lock, flags); | |
f22ee4ed | 378 | host->claimed = 0; |
1da177e4 LT |
379 | spin_unlock_irqrestore(&host->lock, flags); |
380 | ||
381 | wake_up(&host->wq); | |
382 | } | |
383 | ||
384 | EXPORT_SYMBOL(mmc_release_host); | |
385 | ||
920e70c5 RK |
386 | static inline void mmc_set_ios(struct mmc_host *host) |
387 | { | |
388 | struct mmc_ios *ios = &host->ios; | |
389 | ||
cd9277c0 PO |
390 | pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u " |
391 | "width %u timing %u\n", | |
920e70c5 RK |
392 | mmc_hostname(host), ios->clock, ios->bus_mode, |
393 | ios->power_mode, ios->chip_select, ios->vdd, | |
cd9277c0 | 394 | ios->bus_width, ios->timing); |
fba68bd2 | 395 | |
920e70c5 RK |
396 | host->ops->set_ios(host, ios); |
397 | } | |
398 | ||
b57c43ad PO |
399 | static int mmc_select_card(struct mmc_host *host, struct mmc_card *card) |
400 | { | |
401 | int err; | |
402 | struct mmc_command cmd; | |
403 | ||
f22ee4ed | 404 | BUG_ON(!host->claimed); |
b57c43ad PO |
405 | |
406 | if (host->card_selected == card) | |
407 | return MMC_ERR_NONE; | |
408 | ||
409 | host->card_selected = card; | |
410 | ||
411 | cmd.opcode = MMC_SELECT_CARD; | |
412 | cmd.arg = card->rca << 16; | |
e9225176 | 413 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
b57c43ad PO |
414 | |
415 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
416 | if (err != MMC_ERR_NONE) | |
417 | return err; | |
418 | ||
f218278a | 419 | /* |
e45a1bd2 PL |
420 | * We can only change the bus width of SD cards when |
421 | * they are selected so we have to put the handling | |
f218278a | 422 | * here. |
e45a1bd2 PL |
423 | * |
424 | * The card is in 1 bit mode by default so | |
425 | * we only need to change if it supports the | |
426 | * wider version. | |
f218278a | 427 | */ |
e45a1bd2 PL |
428 | if (mmc_card_sd(card) && |
429 | (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { | |
430 | ||
f218278a | 431 | /* |
e45a1bd2 PL |
432 | * Default bus width is 1 bit. |
433 | */ | |
434 | host->ios.bus_width = MMC_BUS_WIDTH_1; | |
435 | ||
436 | if (host->caps & MMC_CAP_4_BIT_DATA) { | |
f218278a PO |
437 | struct mmc_command cmd; |
438 | cmd.opcode = SD_APP_SET_BUS_WIDTH; | |
439 | cmd.arg = SD_BUS_WIDTH_4; | |
e9225176 | 440 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
f218278a PO |
441 | |
442 | err = mmc_wait_for_app_cmd(host, card->rca, &cmd, | |
443 | CMD_RETRIES); | |
444 | if (err != MMC_ERR_NONE) | |
445 | return err; | |
446 | ||
447 | host->ios.bus_width = MMC_BUS_WIDTH_4; | |
448 | } | |
449 | } | |
450 | ||
920e70c5 | 451 | mmc_set_ios(host); |
f218278a | 452 | |
b57c43ad PO |
453 | return MMC_ERR_NONE; |
454 | } | |
455 | ||
1da177e4 LT |
456 | /* |
457 | * Ensure that no card is selected. | |
458 | */ | |
459 | static void mmc_deselect_cards(struct mmc_host *host) | |
460 | { | |
461 | struct mmc_command cmd; | |
462 | ||
463 | if (host->card_selected) { | |
464 | host->card_selected = NULL; | |
465 | ||
466 | cmd.opcode = MMC_SELECT_CARD; | |
467 | cmd.arg = 0; | |
e9225176 | 468 | cmd.flags = MMC_RSP_NONE | MMC_CMD_AC; |
1da177e4 LT |
469 | |
470 | mmc_wait_for_cmd(host, &cmd, 0); | |
471 | } | |
472 | } | |
473 | ||
474 | ||
475 | static inline void mmc_delay(unsigned int ms) | |
476 | { | |
73778120 PO |
477 | if (ms < 1000 / HZ) { |
478 | cond_resched(); | |
1da177e4 LT |
479 | mdelay(ms); |
480 | } else { | |
73778120 | 481 | msleep(ms); |
1da177e4 LT |
482 | } |
483 | } | |
484 | ||
485 | /* | |
486 | * Mask off any voltages we don't support and select | |
487 | * the lowest voltage | |
488 | */ | |
489 | static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) | |
490 | { | |
491 | int bit; | |
492 | ||
493 | ocr &= host->ocr_avail; | |
494 | ||
495 | bit = ffs(ocr); | |
496 | if (bit) { | |
497 | bit -= 1; | |
498 | ||
63ef731a | 499 | ocr &= 3 << bit; |
1da177e4 LT |
500 | |
501 | host->ios.vdd = bit; | |
920e70c5 | 502 | mmc_set_ios(host); |
1da177e4 LT |
503 | } else { |
504 | ocr = 0; | |
505 | } | |
506 | ||
507 | return ocr; | |
508 | } | |
509 | ||
510 | #define UNSTUFF_BITS(resp,start,size) \ | |
511 | ({ \ | |
512 | const int __size = size; \ | |
513 | const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ | |
514 | const int __off = 3 - ((start) / 32); \ | |
515 | const int __shft = (start) & 31; \ | |
516 | u32 __res; \ | |
517 | \ | |
518 | __res = resp[__off] >> __shft; \ | |
519 | if (__size + __shft > 32) \ | |
520 | __res |= resp[__off-1] << ((32 - __shft) % 32); \ | |
521 | __res & __mask; \ | |
522 | }) | |
523 | ||
524 | /* | |
525 | * Given the decoded CSD structure, decode the raw CID to our CID structure. | |
526 | */ | |
527 | static void mmc_decode_cid(struct mmc_card *card) | |
528 | { | |
529 | u32 *resp = card->raw_cid; | |
530 | ||
531 | memset(&card->cid, 0, sizeof(struct mmc_cid)); | |
532 | ||
335eadf2 PO |
533 | if (mmc_card_sd(card)) { |
534 | /* | |
535 | * SD doesn't currently have a version field so we will | |
536 | * have to assume we can parse this. | |
537 | */ | |
538 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); | |
539 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
540 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
541 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
542 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
543 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
544 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
545 | card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); | |
546 | card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); | |
547 | card->cid.serial = UNSTUFF_BITS(resp, 24, 32); | |
548 | card->cid.year = UNSTUFF_BITS(resp, 12, 8); | |
549 | card->cid.month = UNSTUFF_BITS(resp, 8, 4); | |
550 | ||
551 | card->cid.year += 2000; /* SD cards year offset */ | |
a00fc090 | 552 | } else { |
335eadf2 PO |
553 | /* |
554 | * The selection of the format here is based upon published | |
555 | * specs from sandisk and from what people have reported. | |
556 | */ | |
557 | switch (card->csd.mmca_vsn) { | |
558 | case 0: /* MMC v1.0 - v1.2 */ | |
559 | case 1: /* MMC v1.4 */ | |
560 | card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); | |
561 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
562 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
563 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
564 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
565 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
566 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
567 | card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); | |
568 | card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); | |
569 | card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); | |
570 | card->cid.serial = UNSTUFF_BITS(resp, 16, 24); | |
571 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
572 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
573 | break; | |
574 | ||
575 | case 2: /* MMC v2.0 - v2.2 */ | |
576 | case 3: /* MMC v3.1 - v3.3 */ | |
cb757b4e | 577 | case 4: /* MMC v4 */ |
335eadf2 PO |
578 | card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); |
579 | card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); | |
580 | card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); | |
581 | card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); | |
582 | card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); | |
583 | card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); | |
584 | card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); | |
585 | card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); | |
586 | card->cid.serial = UNSTUFF_BITS(resp, 16, 32); | |
587 | card->cid.month = UNSTUFF_BITS(resp, 12, 4); | |
588 | card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; | |
589 | break; | |
590 | ||
591 | default: | |
592 | printk("%s: card has unknown MMCA version %d\n", | |
593 | mmc_hostname(card->host), card->csd.mmca_vsn); | |
594 | mmc_card_set_bad(card); | |
595 | break; | |
596 | } | |
1da177e4 LT |
597 | } |
598 | } | |
599 | ||
600 | /* | |
601 | * Given a 128-bit response, decode to our card CSD structure. | |
602 | */ | |
603 | static void mmc_decode_csd(struct mmc_card *card) | |
604 | { | |
605 | struct mmc_csd *csd = &card->csd; | |
606 | unsigned int e, m, csd_struct; | |
607 | u32 *resp = card->raw_csd; | |
608 | ||
335eadf2 PO |
609 | if (mmc_card_sd(card)) { |
610 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
fba68bd2 PL |
611 | |
612 | switch (csd_struct) { | |
613 | case 0: | |
614 | m = UNSTUFF_BITS(resp, 115, 4); | |
615 | e = UNSTUFF_BITS(resp, 112, 3); | |
616 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
617 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
618 | ||
619 | m = UNSTUFF_BITS(resp, 99, 4); | |
620 | e = UNSTUFF_BITS(resp, 96, 3); | |
621 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
622 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
623 | ||
624 | e = UNSTUFF_BITS(resp, 47, 3); | |
625 | m = UNSTUFF_BITS(resp, 62, 12); | |
626 | csd->capacity = (1 + m) << (e + 2); | |
627 | ||
628 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); | |
629 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); | |
630 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
631 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
632 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); | |
633 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); | |
634 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
635 | break; | |
636 | case 1: | |
637 | /* | |
638 | * This is a block-addressed SDHC card. Most | |
639 | * interesting fields are unused and have fixed | |
640 | * values. To avoid getting tripped by buggy cards, | |
641 | * we assume those fixed values ourselves. | |
642 | */ | |
643 | mmc_card_set_blockaddr(card); | |
644 | ||
645 | csd->tacc_ns = 0; /* Unused */ | |
646 | csd->tacc_clks = 0; /* Unused */ | |
647 | ||
648 | m = UNSTUFF_BITS(resp, 99, 4); | |
649 | e = UNSTUFF_BITS(resp, 96, 3); | |
650 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
651 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
652 | ||
653 | m = UNSTUFF_BITS(resp, 48, 22); | |
654 | csd->capacity = (1 + m) << 10; | |
655 | ||
656 | csd->read_blkbits = 9; | |
657 | csd->read_partial = 0; | |
658 | csd->write_misalign = 0; | |
659 | csd->read_misalign = 0; | |
660 | csd->r2w_factor = 4; /* Unused */ | |
661 | csd->write_blkbits = 9; | |
662 | csd->write_partial = 0; | |
663 | break; | |
664 | default: | |
335eadf2 PO |
665 | printk("%s: unrecognised CSD structure version %d\n", |
666 | mmc_hostname(card->host), csd_struct); | |
667 | mmc_card_set_bad(card); | |
668 | return; | |
669 | } | |
a00fc090 | 670 | } else { |
335eadf2 PO |
671 | /* |
672 | * We only understand CSD structure v1.1 and v1.2. | |
673 | * v1.2 has extra information in bits 15, 11 and 10. | |
674 | */ | |
675 | csd_struct = UNSTUFF_BITS(resp, 126, 2); | |
676 | if (csd_struct != 1 && csd_struct != 2) { | |
677 | printk("%s: unrecognised CSD structure version %d\n", | |
678 | mmc_hostname(card->host), csd_struct); | |
679 | mmc_card_set_bad(card); | |
680 | return; | |
681 | } | |
1da177e4 | 682 | |
335eadf2 PO |
683 | csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); |
684 | m = UNSTUFF_BITS(resp, 115, 4); | |
685 | e = UNSTUFF_BITS(resp, 112, 3); | |
686 | csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; | |
687 | csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; | |
1da177e4 | 688 | |
335eadf2 PO |
689 | m = UNSTUFF_BITS(resp, 99, 4); |
690 | e = UNSTUFF_BITS(resp, 96, 3); | |
691 | csd->max_dtr = tran_exp[e] * tran_mant[m]; | |
692 | csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); | |
1da177e4 | 693 | |
335eadf2 PO |
694 | e = UNSTUFF_BITS(resp, 47, 3); |
695 | m = UNSTUFF_BITS(resp, 62, 12); | |
696 | csd->capacity = (1 + m) << (e + 2); | |
1da177e4 | 697 | |
335eadf2 | 698 | csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); |
a6f6c96b RK |
699 | csd->read_partial = UNSTUFF_BITS(resp, 79, 1); |
700 | csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); | |
701 | csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); | |
37be4e78 | 702 | csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); |
a6f6c96b RK |
703 | csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); |
704 | csd->write_partial = UNSTUFF_BITS(resp, 21, 1); | |
335eadf2 | 705 | } |
1da177e4 LT |
706 | } |
707 | ||
b57c43ad PO |
708 | /* |
709 | * Given a 64-bit response, decode to our card SCR structure. | |
710 | */ | |
711 | static void mmc_decode_scr(struct mmc_card *card) | |
712 | { | |
713 | struct sd_scr *scr = &card->scr; | |
714 | unsigned int scr_struct; | |
715 | u32 resp[4]; | |
716 | ||
717 | BUG_ON(!mmc_card_sd(card)); | |
718 | ||
719 | resp[3] = card->raw_scr[1]; | |
720 | resp[2] = card->raw_scr[0]; | |
721 | ||
722 | scr_struct = UNSTUFF_BITS(resp, 60, 4); | |
723 | if (scr_struct != 0) { | |
724 | printk("%s: unrecognised SCR structure version %d\n", | |
725 | mmc_hostname(card->host), scr_struct); | |
726 | mmc_card_set_bad(card); | |
727 | return; | |
728 | } | |
729 | ||
730 | scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); | |
731 | scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); | |
732 | } | |
733 | ||
1da177e4 LT |
734 | /* |
735 | * Locate a MMC card on this MMC host given a raw CID. | |
736 | */ | |
737 | static struct mmc_card *mmc_find_card(struct mmc_host *host, u32 *raw_cid) | |
738 | { | |
739 | struct mmc_card *card; | |
740 | ||
741 | list_for_each_entry(card, &host->cards, node) { | |
742 | if (memcmp(card->raw_cid, raw_cid, sizeof(card->raw_cid)) == 0) | |
743 | return card; | |
744 | } | |
745 | return NULL; | |
746 | } | |
747 | ||
748 | /* | |
749 | * Allocate a new MMC card, and assign a unique RCA. | |
750 | */ | |
751 | static struct mmc_card * | |
752 | mmc_alloc_card(struct mmc_host *host, u32 *raw_cid, unsigned int *frca) | |
753 | { | |
754 | struct mmc_card *card, *c; | |
755 | unsigned int rca = *frca; | |
756 | ||
757 | card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL); | |
758 | if (!card) | |
759 | return ERR_PTR(-ENOMEM); | |
760 | ||
761 | mmc_init_card(card, host); | |
762 | memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid)); | |
763 | ||
764 | again: | |
765 | list_for_each_entry(c, &host->cards, node) | |
766 | if (c->rca == rca) { | |
767 | rca++; | |
768 | goto again; | |
769 | } | |
770 | ||
771 | card->rca = rca; | |
772 | ||
773 | *frca = rca; | |
774 | ||
775 | return card; | |
776 | } | |
777 | ||
778 | /* | |
779 | * Tell attached cards to go to IDLE state | |
780 | */ | |
781 | static void mmc_idle_cards(struct mmc_host *host) | |
782 | { | |
783 | struct mmc_command cmd; | |
784 | ||
865e9f13 | 785 | host->ios.chip_select = MMC_CS_HIGH; |
920e70c5 | 786 | mmc_set_ios(host); |
865e9f13 PO |
787 | |
788 | mmc_delay(1); | |
789 | ||
1da177e4 LT |
790 | cmd.opcode = MMC_GO_IDLE_STATE; |
791 | cmd.arg = 0; | |
e9225176 | 792 | cmd.flags = MMC_RSP_NONE | MMC_CMD_BC; |
1da177e4 LT |
793 | |
794 | mmc_wait_for_cmd(host, &cmd, 0); | |
795 | ||
796 | mmc_delay(1); | |
865e9f13 PO |
797 | |
798 | host->ios.chip_select = MMC_CS_DONTCARE; | |
920e70c5 | 799 | mmc_set_ios(host); |
865e9f13 PO |
800 | |
801 | mmc_delay(1); | |
1da177e4 LT |
802 | } |
803 | ||
804 | /* | |
45f8245b RK |
805 | * Apply power to the MMC stack. This is a two-stage process. |
806 | * First, we enable power to the card without the clock running. | |
807 | * We then wait a bit for the power to stabilise. Finally, | |
808 | * enable the bus drivers and clock to the card. | |
809 | * | |
810 | * We must _NOT_ enable the clock prior to power stablising. | |
811 | * | |
812 | * If a host does all the power sequencing itself, ignore the | |
813 | * initial MMC_POWER_UP stage. | |
1da177e4 LT |
814 | */ |
815 | static void mmc_power_up(struct mmc_host *host) | |
816 | { | |
817 | int bit = fls(host->ocr_avail) - 1; | |
818 | ||
819 | host->ios.vdd = bit; | |
820 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 821 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 822 | host->ios.power_mode = MMC_POWER_UP; |
f218278a | 823 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 824 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 825 | mmc_set_ios(host); |
1da177e4 LT |
826 | |
827 | mmc_delay(1); | |
828 | ||
829 | host->ios.clock = host->f_min; | |
830 | host->ios.power_mode = MMC_POWER_ON; | |
920e70c5 | 831 | mmc_set_ios(host); |
1da177e4 LT |
832 | |
833 | mmc_delay(2); | |
834 | } | |
835 | ||
836 | static void mmc_power_off(struct mmc_host *host) | |
837 | { | |
838 | host->ios.clock = 0; | |
839 | host->ios.vdd = 0; | |
840 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
865e9f13 | 841 | host->ios.chip_select = MMC_CS_DONTCARE; |
1da177e4 | 842 | host->ios.power_mode = MMC_POWER_OFF; |
f218278a | 843 | host->ios.bus_width = MMC_BUS_WIDTH_1; |
cd9277c0 | 844 | host->ios.timing = MMC_TIMING_LEGACY; |
920e70c5 | 845 | mmc_set_ios(host); |
1da177e4 LT |
846 | } |
847 | ||
848 | static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) | |
849 | { | |
850 | struct mmc_command cmd; | |
851 | int i, err = 0; | |
852 | ||
853 | cmd.opcode = MMC_SEND_OP_COND; | |
854 | cmd.arg = ocr; | |
e9225176 | 855 | cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; |
1da177e4 LT |
856 | |
857 | for (i = 100; i; i--) { | |
858 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
859 | if (err != MMC_ERR_NONE) | |
860 | break; | |
861 | ||
862 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
863 | break; | |
864 | ||
865 | err = MMC_ERR_TIMEOUT; | |
866 | ||
867 | mmc_delay(10); | |
868 | } | |
869 | ||
870 | if (rocr) | |
871 | *rocr = cmd.resp[0]; | |
872 | ||
873 | return err; | |
874 | } | |
875 | ||
335eadf2 PO |
876 | static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) |
877 | { | |
878 | struct mmc_command cmd; | |
879 | int i, err = 0; | |
880 | ||
881 | cmd.opcode = SD_APP_OP_COND; | |
882 | cmd.arg = ocr; | |
e9225176 | 883 | cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR; |
335eadf2 PO |
884 | |
885 | for (i = 100; i; i--) { | |
886 | err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES); | |
887 | if (err != MMC_ERR_NONE) | |
888 | break; | |
889 | ||
890 | if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) | |
891 | break; | |
892 | ||
893 | err = MMC_ERR_TIMEOUT; | |
894 | ||
895 | mmc_delay(10); | |
896 | } | |
897 | ||
898 | if (rocr) | |
899 | *rocr = cmd.resp[0]; | |
900 | ||
901 | return err; | |
902 | } | |
903 | ||
fba68bd2 PL |
904 | static int mmc_send_if_cond(struct mmc_host *host, u32 ocr, int *rsd2) |
905 | { | |
906 | struct mmc_command cmd; | |
907 | int err, sd2; | |
908 | static const u8 test_pattern = 0xAA; | |
909 | ||
910 | /* | |
911 | * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND | |
912 | * before SD_APP_OP_COND. This command will harmlessly fail for | |
913 | * SD 1.0 cards. | |
914 | */ | |
915 | cmd.opcode = SD_SEND_IF_COND; | |
916 | cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern; | |
917 | cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR; | |
918 | ||
919 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
920 | if (err == MMC_ERR_NONE) { | |
921 | if ((cmd.resp[0] & 0xFF) == test_pattern) { | |
922 | sd2 = 1; | |
923 | } else { | |
924 | sd2 = 0; | |
925 | err = MMC_ERR_FAILED; | |
926 | } | |
927 | } else { | |
928 | /* | |
929 | * Treat errors as SD 1.0 card. | |
930 | */ | |
931 | sd2 = 0; | |
932 | err = MMC_ERR_NONE; | |
933 | } | |
934 | if (rsd2) | |
935 | *rsd2 = sd2; | |
936 | return err; | |
937 | } | |
938 | ||
1da177e4 LT |
939 | /* |
940 | * Discover cards by requesting their CID. If this command | |
941 | * times out, it is not an error; there are no further cards | |
942 | * to be discovered. Add new cards to the list. | |
943 | * | |
944 | * Create a mmc_card entry for each discovered card, assigning | |
945 | * it an RCA, and save the raw CID for decoding later. | |
946 | */ | |
947 | static void mmc_discover_cards(struct mmc_host *host) | |
948 | { | |
949 | struct mmc_card *card; | |
950 | unsigned int first_rca = 1, err; | |
951 | ||
952 | while (1) { | |
953 | struct mmc_command cmd; | |
954 | ||
955 | cmd.opcode = MMC_ALL_SEND_CID; | |
956 | cmd.arg = 0; | |
e9225176 | 957 | cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR; |
1da177e4 LT |
958 | |
959 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
960 | if (err == MMC_ERR_TIMEOUT) { | |
961 | err = MMC_ERR_NONE; | |
962 | break; | |
963 | } | |
964 | if (err != MMC_ERR_NONE) { | |
965 | printk(KERN_ERR "%s: error requesting CID: %d\n", | |
d366b643 | 966 | mmc_hostname(host), err); |
1da177e4 LT |
967 | break; |
968 | } | |
969 | ||
970 | card = mmc_find_card(host, cmd.resp); | |
971 | if (!card) { | |
972 | card = mmc_alloc_card(host, cmd.resp, &first_rca); | |
973 | if (IS_ERR(card)) { | |
974 | err = PTR_ERR(card); | |
975 | break; | |
976 | } | |
977 | list_add(&card->node, &host->cards); | |
978 | } | |
979 | ||
980 | card->state &= ~MMC_STATE_DEAD; | |
981 | ||
335eadf2 | 982 | if (host->mode == MMC_MODE_SD) { |
9c2c0af9 | 983 | card->type = MMC_TYPE_SD; |
1da177e4 | 984 | |
335eadf2 PO |
985 | cmd.opcode = SD_SEND_RELATIVE_ADDR; |
986 | cmd.arg = 0; | |
e9225176 | 987 | cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; |
335eadf2 PO |
988 | |
989 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
990 | if (err != MMC_ERR_NONE) | |
991 | mmc_card_set_dead(card); | |
a00fc090 | 992 | else { |
335eadf2 | 993 | card->rca = cmd.resp[0] >> 16; |
a00fc090 PO |
994 | |
995 | if (!host->ops->get_ro) { | |
996 | printk(KERN_WARNING "%s: host does not " | |
997 | "support reading read-only " | |
998 | "switch. assuming write-enable.\n", | |
999 | mmc_hostname(host)); | |
1000 | } else { | |
1001 | if (host->ops->get_ro(host)) | |
1002 | mmc_card_set_readonly(card); | |
1003 | } | |
1004 | } | |
1005 | } else { | |
9c2c0af9 | 1006 | card->type = MMC_TYPE_MMC; |
335eadf2 PO |
1007 | cmd.opcode = MMC_SET_RELATIVE_ADDR; |
1008 | cmd.arg = card->rca << 16; | |
e9225176 | 1009 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
335eadf2 PO |
1010 | |
1011 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
1012 | if (err != MMC_ERR_NONE) | |
1013 | mmc_card_set_dead(card); | |
1014 | } | |
1da177e4 LT |
1015 | } |
1016 | } | |
1017 | ||
1018 | static void mmc_read_csds(struct mmc_host *host) | |
1019 | { | |
1020 | struct mmc_card *card; | |
1021 | ||
1022 | list_for_each_entry(card, &host->cards, node) { | |
1023 | struct mmc_command cmd; | |
1024 | int err; | |
1025 | ||
1026 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
1027 | continue; | |
1028 | ||
1029 | cmd.opcode = MMC_SEND_CSD; | |
1030 | cmd.arg = card->rca << 16; | |
e9225176 | 1031 | cmd.flags = MMC_RSP_R2 | MMC_CMD_AC; |
1da177e4 LT |
1032 | |
1033 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
1034 | if (err != MMC_ERR_NONE) { | |
1035 | mmc_card_set_dead(card); | |
1036 | continue; | |
1037 | } | |
1038 | ||
1039 | memcpy(card->raw_csd, cmd.resp, sizeof(card->raw_csd)); | |
1040 | ||
1041 | mmc_decode_csd(card); | |
1042 | mmc_decode_cid(card); | |
1043 | } | |
1044 | } | |
1045 | ||
bce40a36 PL |
1046 | static void mmc_process_ext_csds(struct mmc_host *host) |
1047 | { | |
1048 | int err; | |
1049 | struct mmc_card *card; | |
1050 | ||
1051 | struct mmc_request mrq; | |
1052 | struct mmc_command cmd; | |
1053 | struct mmc_data data; | |
1054 | ||
1055 | struct scatterlist sg; | |
1056 | ||
1057 | /* | |
1058 | * As the ext_csd is so large and mostly unused, we don't store the | |
1059 | * raw block in mmc_card. | |
1060 | */ | |
1061 | u8 *ext_csd; | |
1062 | ext_csd = kmalloc(512, GFP_KERNEL); | |
1063 | if (!ext_csd) { | |
1064 | printk("%s: could not allocate a buffer to receive the ext_csd." | |
1065 | "mmc v4 cards will be treated as v3.\n", | |
1066 | mmc_hostname(host)); | |
1067 | return; | |
1068 | } | |
1069 | ||
1070 | list_for_each_entry(card, &host->cards, node) { | |
1071 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
1072 | continue; | |
1073 | if (mmc_card_sd(card)) | |
1074 | continue; | |
1075 | if (card->csd.mmca_vsn < CSD_SPEC_VER_4) | |
1076 | continue; | |
1077 | ||
1078 | err = mmc_select_card(host, card); | |
1079 | if (err != MMC_ERR_NONE) { | |
1080 | mmc_card_set_dead(card); | |
1081 | continue; | |
1082 | } | |
1083 | ||
1084 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1085 | ||
1086 | cmd.opcode = MMC_SEND_EXT_CSD; | |
1087 | cmd.arg = 0; | |
1088 | cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; | |
1089 | ||
1090 | memset(&data, 0, sizeof(struct mmc_data)); | |
1091 | ||
1092 | mmc_set_data_timeout(&data, card, 0); | |
1093 | ||
1094 | data.blksz = 512; | |
1095 | data.blocks = 1; | |
1096 | data.flags = MMC_DATA_READ; | |
1097 | data.sg = &sg; | |
1098 | data.sg_len = 1; | |
1099 | ||
1100 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
1101 | ||
1102 | mrq.cmd = &cmd; | |
1103 | mrq.data = &data; | |
1104 | ||
1105 | sg_init_one(&sg, ext_csd, 512); | |
1106 | ||
1107 | mmc_wait_for_req(host, &mrq); | |
1108 | ||
1109 | if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { | |
85a18ad9 PO |
1110 | if (card->csd.capacity == (4096 * 512)) { |
1111 | printk(KERN_ERR "%s: unable to read EXT_CSD " | |
1112 | "on a possible high capacity card. " | |
1113 | "Card will be ignored.\n", | |
1114 | mmc_hostname(card->host)); | |
1115 | mmc_card_set_dead(card); | |
1116 | } else { | |
1117 | printk(KERN_WARNING "%s: unable to read " | |
1118 | "EXT_CSD, performance might " | |
1119 | "suffer.\n", | |
1120 | mmc_hostname(card->host)); | |
1121 | } | |
bce40a36 PL |
1122 | continue; |
1123 | } | |
1124 | ||
85a18ad9 PO |
1125 | card->ext_csd.sectors = |
1126 | ext_csd[EXT_CSD_SEC_CNT + 0] << 0 | | |
1127 | ext_csd[EXT_CSD_SEC_CNT + 1] << 8 | | |
1128 | ext_csd[EXT_CSD_SEC_CNT + 2] << 16 | | |
1129 | ext_csd[EXT_CSD_SEC_CNT + 3] << 24; | |
1130 | if (card->ext_csd.sectors) | |
1131 | mmc_card_set_blockaddr(card); | |
1132 | ||
bce40a36 PL |
1133 | switch (ext_csd[EXT_CSD_CARD_TYPE]) { |
1134 | case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: | |
1135 | card->ext_csd.hs_max_dtr = 52000000; | |
1136 | break; | |
1137 | case EXT_CSD_CARD_TYPE_26: | |
1138 | card->ext_csd.hs_max_dtr = 26000000; | |
1139 | break; | |
1140 | default: | |
1141 | /* MMC v4 spec says this cannot happen */ | |
1142 | printk("%s: card is mmc v4 but doesn't support " | |
1143 | "any high-speed modes.\n", | |
1144 | mmc_hostname(card->host)); | |
bce40a36 PL |
1145 | continue; |
1146 | } | |
1147 | ||
cd9277c0 PO |
1148 | if (host->caps & MMC_CAP_MMC_HIGHSPEED) { |
1149 | /* Activate highspeed support. */ | |
1150 | cmd.opcode = MMC_SWITCH; | |
1151 | cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | | |
1152 | (EXT_CSD_HS_TIMING << 16) | | |
1153 | (1 << 8) | | |
1154 | EXT_CSD_CMD_SET_NORMAL; | |
1155 | cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; | |
bce40a36 | 1156 | |
cd9277c0 PO |
1157 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); |
1158 | if (err != MMC_ERR_NONE) { | |
1159 | printk("%s: failed to switch card to mmc v4 " | |
1160 | "high-speed mode.\n", | |
1161 | mmc_hostname(card->host)); | |
1162 | continue; | |
1163 | } | |
bce40a36 | 1164 | |
cd9277c0 | 1165 | mmc_card_set_highspeed(card); |
e45a1bd2 | 1166 | |
de859895 | 1167 | host->ios.timing = MMC_TIMING_MMC_HS; |
cd9277c0 | 1168 | mmc_set_ios(host); |
e45a1bd2 PL |
1169 | } |
1170 | ||
cd9277c0 PO |
1171 | /* Check for host support for wide-bus modes. */ |
1172 | if (host->caps & MMC_CAP_4_BIT_DATA) { | |
1173 | /* Activate 4-bit support. */ | |
1174 | cmd.opcode = MMC_SWITCH; | |
1175 | cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | | |
1176 | (EXT_CSD_BUS_WIDTH << 16) | | |
1177 | (EXT_CSD_BUS_WIDTH_4 << 8) | | |
1178 | EXT_CSD_CMD_SET_NORMAL; | |
1179 | cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; | |
e45a1bd2 | 1180 | |
cd9277c0 PO |
1181 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); |
1182 | if (err != MMC_ERR_NONE) { | |
1183 | printk("%s: failed to switch card to " | |
1184 | "mmc v4 4-bit bus mode.\n", | |
1185 | mmc_hostname(card->host)); | |
1186 | continue; | |
1187 | } | |
e45a1bd2 | 1188 | |
cd9277c0 PO |
1189 | host->ios.bus_width = MMC_BUS_WIDTH_4; |
1190 | mmc_set_ios(host); | |
1191 | } | |
bce40a36 PL |
1192 | } |
1193 | ||
1194 | kfree(ext_csd); | |
1195 | ||
1196 | mmc_deselect_cards(host); | |
1197 | } | |
1198 | ||
b57c43ad PO |
1199 | static void mmc_read_scrs(struct mmc_host *host) |
1200 | { | |
1201 | int err; | |
1202 | struct mmc_card *card; | |
b57c43ad PO |
1203 | struct mmc_request mrq; |
1204 | struct mmc_command cmd; | |
1205 | struct mmc_data data; | |
b57c43ad PO |
1206 | struct scatterlist sg; |
1207 | ||
1208 | list_for_each_entry(card, &host->cards, node) { | |
1209 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
1210 | continue; | |
1211 | if (!mmc_card_sd(card)) | |
1212 | continue; | |
1213 | ||
1214 | err = mmc_select_card(host, card); | |
1215 | if (err != MMC_ERR_NONE) { | |
1216 | mmc_card_set_dead(card); | |
1217 | continue; | |
1218 | } | |
1219 | ||
1220 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1221 | ||
1222 | cmd.opcode = MMC_APP_CMD; | |
1223 | cmd.arg = card->rca << 16; | |
e9225176 | 1224 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
b57c43ad PO |
1225 | |
1226 | err = mmc_wait_for_cmd(host, &cmd, 0); | |
1227 | if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) { | |
1228 | mmc_card_set_dead(card); | |
1229 | continue; | |
1230 | } | |
1231 | ||
1232 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1233 | ||
1234 | cmd.opcode = SD_APP_SEND_SCR; | |
1235 | cmd.arg = 0; | |
e9225176 | 1236 | cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; |
b57c43ad PO |
1237 | |
1238 | memset(&data, 0, sizeof(struct mmc_data)); | |
1239 | ||
d773d725 | 1240 | mmc_set_data_timeout(&data, card, 0); |
385e3227 | 1241 | |
2c171bf1 | 1242 | data.blksz = 1 << 3; |
b57c43ad PO |
1243 | data.blocks = 1; |
1244 | data.flags = MMC_DATA_READ; | |
1245 | data.sg = &sg; | |
1246 | data.sg_len = 1; | |
1247 | ||
1248 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
1249 | ||
1250 | mrq.cmd = &cmd; | |
1251 | mrq.data = &data; | |
1252 | ||
1253 | sg_init_one(&sg, (u8*)card->raw_scr, 8); | |
1254 | ||
e781de44 PO |
1255 | mmc_wait_for_req(host, &mrq); |
1256 | ||
1257 | if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { | |
b57c43ad PO |
1258 | mmc_card_set_dead(card); |
1259 | continue; | |
1260 | } | |
1261 | ||
1262 | card->raw_scr[0] = ntohl(card->raw_scr[0]); | |
1263 | card->raw_scr[1] = ntohl(card->raw_scr[1]); | |
1264 | ||
1265 | mmc_decode_scr(card); | |
1266 | } | |
1267 | ||
1268 | mmc_deselect_cards(host); | |
1269 | } | |
1270 | ||
7ccd266e PO |
1271 | static void mmc_read_switch_caps(struct mmc_host *host) |
1272 | { | |
1273 | int err; | |
1274 | struct mmc_card *card; | |
1275 | struct mmc_request mrq; | |
1276 | struct mmc_command cmd; | |
1277 | struct mmc_data data; | |
1278 | unsigned char *status; | |
1279 | struct scatterlist sg; | |
1280 | ||
cd9277c0 PO |
1281 | if (!(host->caps & MMC_CAP_SD_HIGHSPEED)) |
1282 | return; | |
1283 | ||
7ccd266e PO |
1284 | status = kmalloc(64, GFP_KERNEL); |
1285 | if (!status) { | |
1286 | printk(KERN_WARNING "%s: Unable to allocate buffer for " | |
1287 | "reading switch capabilities.\n", | |
1288 | mmc_hostname(host)); | |
1289 | return; | |
1290 | } | |
1291 | ||
1292 | list_for_each_entry(card, &host->cards, node) { | |
1293 | if (card->state & (MMC_STATE_DEAD|MMC_STATE_PRESENT)) | |
1294 | continue; | |
1295 | if (!mmc_card_sd(card)) | |
1296 | continue; | |
1297 | if (card->scr.sda_vsn < SCR_SPEC_VER_1) | |
1298 | continue; | |
1299 | ||
1300 | err = mmc_select_card(host, card); | |
1301 | if (err != MMC_ERR_NONE) { | |
1302 | mmc_card_set_dead(card); | |
1303 | continue; | |
1304 | } | |
1305 | ||
1306 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1307 | ||
1308 | cmd.opcode = SD_SWITCH; | |
1309 | cmd.arg = 0x00FFFFF1; | |
1310 | cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; | |
1311 | ||
1312 | memset(&data, 0, sizeof(struct mmc_data)); | |
1313 | ||
1314 | mmc_set_data_timeout(&data, card, 0); | |
1315 | ||
1316 | data.blksz = 64; | |
1317 | data.blocks = 1; | |
1318 | data.flags = MMC_DATA_READ; | |
1319 | data.sg = &sg; | |
1320 | data.sg_len = 1; | |
1321 | ||
1322 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
1323 | ||
1324 | mrq.cmd = &cmd; | |
1325 | mrq.data = &data; | |
1326 | ||
1327 | sg_init_one(&sg, status, 64); | |
1328 | ||
1329 | mmc_wait_for_req(host, &mrq); | |
1330 | ||
1331 | if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) { | |
ae06eaf9 PO |
1332 | printk("%s: unable to read switch capabilities, " |
1333 | "performance might suffer.\n", | |
1334 | mmc_hostname(card->host)); | |
7ccd266e PO |
1335 | continue; |
1336 | } | |
1337 | ||
1338 | if (status[13] & 0x02) | |
1339 | card->sw_caps.hs_max_dtr = 50000000; | |
1340 | ||
1341 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
1342 | ||
1343 | cmd.opcode = SD_SWITCH; | |
1344 | cmd.arg = 0x80FFFFF1; | |
1345 | cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; | |
1346 | ||
1347 | memset(&data, 0, sizeof(struct mmc_data)); | |
1348 | ||
1349 | mmc_set_data_timeout(&data, card, 0); | |
1350 | ||
1351 | data.blksz = 64; | |
1352 | data.blocks = 1; | |
1353 | data.flags = MMC_DATA_READ; | |
1354 | data.sg = &sg; | |
1355 | data.sg_len = 1; | |
1356 | ||
1357 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
1358 | ||
1359 | mrq.cmd = &cmd; | |
1360 | mrq.data = &data; | |
1361 | ||
1362 | sg_init_one(&sg, status, 64); | |
1363 | ||
1364 | mmc_wait_for_req(host, &mrq); | |
1365 | ||
ae06eaf9 PO |
1366 | if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE || |
1367 | (status[16] & 0xF) != 1) { | |
7ccd266e PO |
1368 | printk(KERN_WARNING "%s: Problem switching card " |
1369 | "into high-speed mode!\n", | |
1370 | mmc_hostname(host)); | |
1371 | continue; | |
1372 | } | |
1373 | ||
1374 | mmc_card_set_highspeed(card); | |
cd9277c0 PO |
1375 | |
1376 | host->ios.timing = MMC_TIMING_SD_HS; | |
1377 | mmc_set_ios(host); | |
7ccd266e PO |
1378 | } |
1379 | ||
1380 | kfree(status); | |
1381 | ||
1382 | mmc_deselect_cards(host); | |
1383 | } | |
1384 | ||
1da177e4 LT |
1385 | static unsigned int mmc_calculate_clock(struct mmc_host *host) |
1386 | { | |
1387 | struct mmc_card *card; | |
1388 | unsigned int max_dtr = host->f_max; | |
1389 | ||
1390 | list_for_each_entry(card, &host->cards, node) | |
bce40a36 | 1391 | if (!mmc_card_dead(card)) { |
7ccd266e PO |
1392 | if (mmc_card_highspeed(card) && mmc_card_sd(card)) { |
1393 | if (max_dtr > card->sw_caps.hs_max_dtr) | |
1394 | max_dtr = card->sw_caps.hs_max_dtr; | |
1395 | } else if (mmc_card_highspeed(card) && !mmc_card_sd(card)) { | |
bce40a36 | 1396 | if (max_dtr > card->ext_csd.hs_max_dtr) |
7ccd266e | 1397 | max_dtr = card->ext_csd.hs_max_dtr; |
bce40a36 PL |
1398 | } else if (max_dtr > card->csd.max_dtr) { |
1399 | max_dtr = card->csd.max_dtr; | |
1400 | } | |
1401 | } | |
1da177e4 | 1402 | |
920e70c5 RK |
1403 | pr_debug("%s: selected %d.%03dMHz transfer rate\n", |
1404 | mmc_hostname(host), | |
c6563178 | 1405 | max_dtr / 1000000, (max_dtr / 1000) % 1000); |
1da177e4 LT |
1406 | |
1407 | return max_dtr; | |
1408 | } | |
1409 | ||
1410 | /* | |
1411 | * Check whether cards we already know about are still present. | |
1412 | * We do this by requesting status, and checking whether a card | |
1413 | * responds. | |
1414 | * | |
1415 | * A request for status does not cause a state change in data | |
1416 | * transfer mode. | |
1417 | */ | |
1418 | static void mmc_check_cards(struct mmc_host *host) | |
1419 | { | |
1420 | struct list_head *l, *n; | |
1421 | ||
1422 | mmc_deselect_cards(host); | |
1423 | ||
1424 | list_for_each_safe(l, n, &host->cards) { | |
1425 | struct mmc_card *card = mmc_list_to_card(l); | |
1426 | struct mmc_command cmd; | |
1427 | int err; | |
1428 | ||
1429 | cmd.opcode = MMC_SEND_STATUS; | |
1430 | cmd.arg = card->rca << 16; | |
e9225176 | 1431 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; |
1da177e4 LT |
1432 | |
1433 | err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES); | |
1434 | if (err == MMC_ERR_NONE) | |
1435 | continue; | |
1436 | ||
1437 | mmc_card_set_dead(card); | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | static void mmc_setup(struct mmc_host *host) | |
1442 | { | |
1443 | if (host->ios.power_mode != MMC_POWER_ON) { | |
1444 | int err; | |
1445 | u32 ocr; | |
1446 | ||
a00fc090 | 1447 | host->mode = MMC_MODE_SD; |
335eadf2 | 1448 | |
1da177e4 LT |
1449 | mmc_power_up(host); |
1450 | mmc_idle_cards(host); | |
1451 | ||
fba68bd2 PL |
1452 | err = mmc_send_if_cond(host, host->ocr_avail, NULL); |
1453 | if (err != MMC_ERR_NONE) { | |
1454 | return; | |
1455 | } | |
a00fc090 | 1456 | err = mmc_send_app_op_cond(host, 0, &ocr); |
335eadf2 PO |
1457 | |
1458 | /* | |
a00fc090 PO |
1459 | * If we fail to detect any SD cards then try |
1460 | * searching for MMC cards. | |
335eadf2 | 1461 | */ |
a00fc090 PO |
1462 | if (err != MMC_ERR_NONE) { |
1463 | host->mode = MMC_MODE_MMC; | |
1464 | ||
1465 | err = mmc_send_op_cond(host, 0, &ocr); | |
335eadf2 PO |
1466 | if (err != MMC_ERR_NONE) |
1467 | return; | |
335eadf2 | 1468 | } |
1da177e4 LT |
1469 | |
1470 | host->ocr = mmc_select_voltage(host, ocr); | |
1471 | ||
1472 | /* | |
1473 | * Since we're changing the OCR value, we seem to | |
1474 | * need to tell some cards to go back to the idle | |
1475 | * state. We wait 1ms to give cards time to | |
1476 | * respond. | |
1477 | */ | |
1478 | if (host->ocr) | |
1479 | mmc_idle_cards(host); | |
1480 | } else { | |
1481 | host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN; | |
1482 | host->ios.clock = host->f_min; | |
920e70c5 | 1483 | mmc_set_ios(host); |
1da177e4 LT |
1484 | |
1485 | /* | |
1486 | * We should remember the OCR mask from the existing | |
1487 | * cards, and detect the new cards OCR mask, combine | |
1488 | * the two and re-select the VDD. However, if we do | |
1489 | * change VDD, we should do an idle, and then do a | |
1490 | * full re-initialisation. We would need to notify | |
1491 | * drivers so that they can re-setup the cards as | |
1492 | * well, while keeping their queues at bay. | |
1493 | * | |
1494 | * For the moment, we take the easy way out - if the | |
1495 | * new cards don't like our currently selected VDD, | |
1496 | * they drop off the bus. | |
1497 | */ | |
1498 | } | |
1499 | ||
1500 | if (host->ocr == 0) | |
1501 | return; | |
1502 | ||
1503 | /* | |
1504 | * Send the selected OCR multiple times... until the cards | |
1505 | * all get the idea that they should be ready for CMD2. | |
1506 | * (My SanDisk card seems to need this.) | |
1507 | */ | |
fba68bd2 PL |
1508 | if (host->mode == MMC_MODE_SD) { |
1509 | int err, sd2; | |
1510 | err = mmc_send_if_cond(host, host->ocr, &sd2); | |
1511 | if (err == MMC_ERR_NONE) { | |
1512 | /* | |
1513 | * If SD_SEND_IF_COND indicates an SD 2.0 | |
1514 | * compliant card and we should set bit 30 | |
1515 | * of the ocr to indicate that we can handle | |
1516 | * block-addressed SDHC cards. | |
1517 | */ | |
1518 | mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL); | |
1519 | } | |
1520 | } else { | |
85a18ad9 PO |
1521 | /* The extra bit indicates that we support high capacity */ |
1522 | mmc_send_op_cond(host, host->ocr | (1 << 30), NULL); | |
fba68bd2 | 1523 | } |
1da177e4 LT |
1524 | |
1525 | mmc_discover_cards(host); | |
1526 | ||
1527 | /* | |
1528 | * Ok, now switch to push-pull mode. | |
1529 | */ | |
1530 | host->ios.bus_mode = MMC_BUSMODE_PUSHPULL; | |
920e70c5 | 1531 | mmc_set_ios(host); |
1da177e4 LT |
1532 | |
1533 | mmc_read_csds(host); | |
b57c43ad | 1534 | |
7ccd266e | 1535 | if (host->mode == MMC_MODE_SD) { |
b57c43ad | 1536 | mmc_read_scrs(host); |
7ccd266e PO |
1537 | mmc_read_switch_caps(host); |
1538 | } else | |
bce40a36 | 1539 | mmc_process_ext_csds(host); |
1da177e4 LT |
1540 | } |
1541 | ||
1542 | ||
1543 | /** | |
1544 | * mmc_detect_change - process change of state on a MMC socket | |
1545 | * @host: host which changed state. | |
8dc00335 | 1546 | * @delay: optional delay to wait before detection (jiffies) |
1da177e4 LT |
1547 | * |
1548 | * All we know is that card(s) have been inserted or removed | |
1549 | * from the socket(s). We don't know which socket or cards. | |
1550 | */ | |
8dc00335 | 1551 | void mmc_detect_change(struct mmc_host *host, unsigned long delay) |
1da177e4 | 1552 | { |
c4028958 | 1553 | mmc_schedule_delayed_work(&host->detect, delay); |
1da177e4 LT |
1554 | } |
1555 | ||
1556 | EXPORT_SYMBOL(mmc_detect_change); | |
1557 | ||
1558 | ||
c4028958 | 1559 | static void mmc_rescan(struct work_struct *work) |
1da177e4 | 1560 | { |
c4028958 DH |
1561 | struct mmc_host *host = |
1562 | container_of(work, struct mmc_host, detect.work); | |
1da177e4 | 1563 | struct list_head *l, *n; |
25a122fd | 1564 | unsigned char power_mode; |
1da177e4 LT |
1565 | |
1566 | mmc_claim_host(host); | |
1567 | ||
25a122fd TT |
1568 | /* |
1569 | * Check for removed cards and newly inserted ones. We check for | |
1570 | * removed cards first so we can intelligently re-select the VDD. | |
1571 | */ | |
1572 | power_mode = host->ios.power_mode; | |
1573 | if (power_mode == MMC_POWER_ON) | |
1da177e4 LT |
1574 | mmc_check_cards(host); |
1575 | ||
1576 | mmc_setup(host); | |
1577 | ||
25a122fd TT |
1578 | /* |
1579 | * Some broken cards process CMD1 even in stand-by state. There is | |
1580 | * no reply, but an ILLEGAL_COMMAND error is cached and returned | |
1581 | * after next command. We poll for card status here to clear any | |
1582 | * possibly pending error. | |
1583 | */ | |
1584 | if (power_mode == MMC_POWER_ON) | |
1585 | mmc_check_cards(host); | |
1586 | ||
1da177e4 LT |
1587 | if (!list_empty(&host->cards)) { |
1588 | /* | |
1589 | * (Re-)calculate the fastest clock rate which the | |
1590 | * attached cards and the host support. | |
1591 | */ | |
1592 | host->ios.clock = mmc_calculate_clock(host); | |
920e70c5 | 1593 | mmc_set_ios(host); |
1da177e4 LT |
1594 | } |
1595 | ||
1596 | mmc_release_host(host); | |
1597 | ||
1598 | list_for_each_safe(l, n, &host->cards) { | |
1599 | struct mmc_card *card = mmc_list_to_card(l); | |
1600 | ||
1601 | /* | |
1602 | * If this is a new and good card, register it. | |
1603 | */ | |
1604 | if (!mmc_card_present(card) && !mmc_card_dead(card)) { | |
1605 | if (mmc_register_card(card)) | |
1606 | mmc_card_set_dead(card); | |
1da177e4 LT |
1607 | } |
1608 | ||
1609 | /* | |
1610 | * If this card is dead, destroy it. | |
1611 | */ | |
1612 | if (mmc_card_dead(card)) { | |
1613 | list_del(&card->node); | |
1614 | mmc_remove_card(card); | |
1615 | } | |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | * If we discover that there are no cards on the | |
1620 | * bus, turn off the clock and power down. | |
1621 | */ | |
1622 | if (list_empty(&host->cards)) | |
1623 | mmc_power_off(host); | |
1624 | } | |
1625 | ||
1626 | ||
1627 | /** | |
1628 | * mmc_alloc_host - initialise the per-host structure. | |
1629 | * @extra: sizeof private data structure | |
1630 | * @dev: pointer to host device model structure | |
1631 | * | |
1632 | * Initialise the per-host structure. | |
1633 | */ | |
1634 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
1635 | { | |
1636 | struct mmc_host *host; | |
1637 | ||
00b137cf | 1638 | host = mmc_alloc_host_sysfs(extra, dev); |
1da177e4 | 1639 | if (host) { |
1da177e4 LT |
1640 | spin_lock_init(&host->lock); |
1641 | init_waitqueue_head(&host->wq); | |
1642 | INIT_LIST_HEAD(&host->cards); | |
c4028958 | 1643 | INIT_DELAYED_WORK(&host->detect, mmc_rescan); |
1da177e4 | 1644 | |
1da177e4 LT |
1645 | /* |
1646 | * By default, hosts do not support SGIO or large requests. | |
1647 | * They have to set these according to their abilities. | |
1648 | */ | |
1649 | host->max_hw_segs = 1; | |
1650 | host->max_phys_segs = 1; | |
1da177e4 | 1651 | host->max_seg_size = PAGE_CACHE_SIZE; |
fe4a3c7a | 1652 | |
55db890a | 1653 | host->max_req_size = PAGE_CACHE_SIZE; |
fe4a3c7a | 1654 | host->max_blk_size = 512; |
55db890a | 1655 | host->max_blk_count = PAGE_CACHE_SIZE / 512; |
1da177e4 LT |
1656 | } |
1657 | ||
1658 | return host; | |
1659 | } | |
1660 | ||
1661 | EXPORT_SYMBOL(mmc_alloc_host); | |
1662 | ||
1663 | /** | |
1664 | * mmc_add_host - initialise host hardware | |
1665 | * @host: mmc host | |
1666 | */ | |
1667 | int mmc_add_host(struct mmc_host *host) | |
1668 | { | |
00b137cf | 1669 | int ret; |
1da177e4 | 1670 | |
00b137cf RK |
1671 | ret = mmc_add_host_sysfs(host); |
1672 | if (ret == 0) { | |
1673 | mmc_power_off(host); | |
8dc00335 | 1674 | mmc_detect_change(host, 0); |
00b137cf | 1675 | } |
1da177e4 | 1676 | |
00b137cf | 1677 | return ret; |
1da177e4 LT |
1678 | } |
1679 | ||
1680 | EXPORT_SYMBOL(mmc_add_host); | |
1681 | ||
1682 | /** | |
1683 | * mmc_remove_host - remove host hardware | |
1684 | * @host: mmc host | |
1685 | * | |
1686 | * Unregister and remove all cards associated with this host, | |
1687 | * and power down the MMC bus. | |
1688 | */ | |
1689 | void mmc_remove_host(struct mmc_host *host) | |
1690 | { | |
1691 | struct list_head *l, *n; | |
1692 | ||
1693 | list_for_each_safe(l, n, &host->cards) { | |
1694 | struct mmc_card *card = mmc_list_to_card(l); | |
1695 | ||
1696 | mmc_remove_card(card); | |
1697 | } | |
1698 | ||
1699 | mmc_power_off(host); | |
00b137cf | 1700 | mmc_remove_host_sysfs(host); |
1da177e4 LT |
1701 | } |
1702 | ||
1703 | EXPORT_SYMBOL(mmc_remove_host); | |
1704 | ||
1705 | /** | |
1706 | * mmc_free_host - free the host structure | |
1707 | * @host: mmc host | |
1708 | * | |
1709 | * Free the host once all references to it have been dropped. | |
1710 | */ | |
1711 | void mmc_free_host(struct mmc_host *host) | |
1712 | { | |
7104e2d5 | 1713 | mmc_flush_scheduled_work(); |
00b137cf | 1714 | mmc_free_host_sysfs(host); |
1da177e4 LT |
1715 | } |
1716 | ||
1717 | EXPORT_SYMBOL(mmc_free_host); | |
1718 | ||
1719 | #ifdef CONFIG_PM | |
1720 | ||
1721 | /** | |
1722 | * mmc_suspend_host - suspend a host | |
1723 | * @host: mmc host | |
1724 | * @state: suspend mode (PM_SUSPEND_xxx) | |
1725 | */ | |
e5378ca8 | 1726 | int mmc_suspend_host(struct mmc_host *host, pm_message_t state) |
1da177e4 LT |
1727 | { |
1728 | mmc_claim_host(host); | |
1729 | mmc_deselect_cards(host); | |
1730 | mmc_power_off(host); | |
1731 | mmc_release_host(host); | |
1732 | ||
1733 | return 0; | |
1734 | } | |
1735 | ||
1736 | EXPORT_SYMBOL(mmc_suspend_host); | |
1737 | ||
1738 | /** | |
1739 | * mmc_resume_host - resume a previously suspended host | |
1740 | * @host: mmc host | |
1741 | */ | |
1742 | int mmc_resume_host(struct mmc_host *host) | |
1743 | { | |
c4028958 | 1744 | mmc_rescan(&host->detect.work); |
1da177e4 LT |
1745 | |
1746 | return 0; | |
1747 | } | |
1748 | ||
1749 | EXPORT_SYMBOL(mmc_resume_host); | |
1750 | ||
1751 | #endif | |
1752 | ||
1753 | MODULE_LICENSE("GPL"); |