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1/*
2 * linux/drivers/mmc/core/mmc_ops.h
3 *
4 * Copyright 2006-2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/slab.h>
13#include <linux/types.h>
14#include <linux/scatterlist.h>
15
16#include <linux/mmc/host.h>
17#include <linux/mmc/card.h>
18#include <linux/mmc/mmc.h>
19
20#include "core.h"
21#include "mmc_ops.h"
22
23static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
24{
25 int err;
26 struct mmc_command cmd = {0};
27
28 BUG_ON(!host);
29
30 cmd.opcode = MMC_SELECT_CARD;
31
32 if (card) {
33 cmd.arg = card->rca << 16;
34 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
35 } else {
36 cmd.arg = 0;
37 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
38 }
39
40 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
41 if (err)
42 return err;
43
44 return 0;
45}
46
47int mmc_select_card(struct mmc_card *card)
48{
49 BUG_ON(!card);
50
51 return _mmc_select_card(card->host, card);
52}
53
54int mmc_deselect_cards(struct mmc_host *host)
55{
56 return _mmc_select_card(host, NULL);
57}
58
59int mmc_card_sleepawake(struct mmc_host *host, int sleep)
60{
61 struct mmc_command cmd = {0};
62 struct mmc_card *card = host->card;
63 int err;
64
65 if (sleep)
66 mmc_deselect_cards(host);
67
68 cmd.opcode = MMC_SLEEP_AWAKE;
69 cmd.arg = card->rca << 16;
70 if (sleep)
71 cmd.arg |= 1 << 15;
72
73 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
74 err = mmc_wait_for_cmd(host, &cmd, 0);
75 if (err)
76 return err;
77
78 /*
79 * If the host does not wait while the card signals busy, then we will
80 * will have to wait the sleep/awake timeout. Note, we cannot use the
81 * SEND_STATUS command to poll the status because that command (and most
82 * others) is invalid while the card sleeps.
83 */
84 if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
85 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
86
87 if (!sleep)
88 err = mmc_select_card(card);
89
90 return err;
91}
92
93int mmc_go_idle(struct mmc_host *host)
94{
95 int err;
96 struct mmc_command cmd = {0};
97
98 /*
99 * Non-SPI hosts need to prevent chipselect going active during
100 * GO_IDLE; that would put chips into SPI mode. Remind them of
101 * that in case of hardware that won't pull up DAT3/nCS otherwise.
102 *
103 * SPI hosts ignore ios.chip_select; it's managed according to
104 * rules that must accommodate non-MMC slaves which this layer
105 * won't even know about.
106 */
107 if (!mmc_host_is_spi(host)) {
108 mmc_set_chip_select(host, MMC_CS_HIGH);
109 mmc_delay(1);
110 }
111
112 cmd.opcode = MMC_GO_IDLE_STATE;
113 cmd.arg = 0;
114 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
115
116 err = mmc_wait_for_cmd(host, &cmd, 0);
117
118 mmc_delay(1);
119
120 if (!mmc_host_is_spi(host)) {
121 mmc_set_chip_select(host, MMC_CS_DONTCARE);
122 mmc_delay(1);
123 }
124
125 host->use_spi_crc = 0;
126
127 return err;
128}
129
130int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
131{
132 struct mmc_command cmd = {0};
133 int i, err = 0;
134
135 BUG_ON(!host);
136
137 cmd.opcode = MMC_SEND_OP_COND;
138 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
139 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
140
141 for (i = 100; i; i--) {
142 err = mmc_wait_for_cmd(host, &cmd, 0);
143 if (err)
144 break;
145
146 /* if we're just probing, do a single pass */
147 if (ocr == 0)
148 break;
149
150 /* otherwise wait until reset completes */
151 if (mmc_host_is_spi(host)) {
152 if (!(cmd.resp[0] & R1_SPI_IDLE))
153 break;
154 } else {
155 if (cmd.resp[0] & MMC_CARD_BUSY)
156 break;
157 }
158
159 err = -ETIMEDOUT;
160
161 mmc_delay(10);
162 }
163
164 if (rocr && !mmc_host_is_spi(host))
165 *rocr = cmd.resp[0];
166
167 return err;
168}
169
170int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
171{
172 int err;
173 struct mmc_command cmd = {0};
174
175 BUG_ON(!host);
176 BUG_ON(!cid);
177
178 cmd.opcode = MMC_ALL_SEND_CID;
179 cmd.arg = 0;
180 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
181
182 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
183 if (err)
184 return err;
185
186 memcpy(cid, cmd.resp, sizeof(u32) * 4);
187
188 return 0;
189}
190
191int mmc_set_relative_addr(struct mmc_card *card)
192{
193 int err;
194 struct mmc_command cmd = {0};
195
196 BUG_ON(!card);
197 BUG_ON(!card->host);
198
199 cmd.opcode = MMC_SET_RELATIVE_ADDR;
200 cmd.arg = card->rca << 16;
201 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
202
203 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
204 if (err)
205 return err;
206
207 return 0;
208}
209
210static int
211mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
212{
213 int err;
214 struct mmc_command cmd = {0};
215
216 BUG_ON(!host);
217 BUG_ON(!cxd);
218
219 cmd.opcode = opcode;
220 cmd.arg = arg;
221 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
222
223 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
224 if (err)
225 return err;
226
227 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
228
229 return 0;
230}
231
232static int
233mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
234 u32 opcode, void *buf, unsigned len)
235{
236 struct mmc_request mrq = {0};
237 struct mmc_command cmd = {0};
238 struct mmc_data data = {0};
239 struct scatterlist sg;
240 void *data_buf;
241
242 /* dma onto stack is unsafe/nonportable, but callers to this
243 * routine normally provide temporary on-stack buffers ...
244 */
245 data_buf = kmalloc(len, GFP_KERNEL);
246 if (data_buf == NULL)
247 return -ENOMEM;
248
249 mrq.cmd = &cmd;
250 mrq.data = &data;
251
252 cmd.opcode = opcode;
253 cmd.arg = 0;
254
255 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
256 * rely on callers to never use this with "native" calls for reading
257 * CSD or CID. Native versions of those commands use the R2 type,
258 * not R1 plus a data block.
259 */
260 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
261
262 data.blksz = len;
263 data.blocks = 1;
264 data.flags = MMC_DATA_READ;
265 data.sg = &sg;
266 data.sg_len = 1;
267
268 sg_init_one(&sg, data_buf, len);
269
270 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
271 /*
272 * The spec states that CSR and CID accesses have a timeout
273 * of 64 clock cycles.
274 */
275 data.timeout_ns = 0;
276 data.timeout_clks = 64;
277 } else
278 mmc_set_data_timeout(&data, card);
279
280 mmc_wait_for_req(host, &mrq);
281
282 memcpy(buf, data_buf, len);
283 kfree(data_buf);
284
285 if (cmd.error)
286 return cmd.error;
287 if (data.error)
288 return data.error;
289
290 return 0;
291}
292
293int mmc_send_csd(struct mmc_card *card, u32 *csd)
294{
295 int ret, i;
296
297 if (!mmc_host_is_spi(card->host))
298 return mmc_send_cxd_native(card->host, card->rca << 16,
299 csd, MMC_SEND_CSD);
300
301 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
302 if (ret)
303 return ret;
304
305 for (i = 0;i < 4;i++)
306 csd[i] = be32_to_cpu(csd[i]);
307
308 return 0;
309}
310
311int mmc_send_cid(struct mmc_host *host, u32 *cid)
312{
313 int ret, i;
314
315 if (!mmc_host_is_spi(host)) {
316 if (!host->card)
317 return -EINVAL;
318 return mmc_send_cxd_native(host, host->card->rca << 16,
319 cid, MMC_SEND_CID);
320 }
321
322 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
323 if (ret)
324 return ret;
325
326 for (i = 0;i < 4;i++)
327 cid[i] = be32_to_cpu(cid[i]);
328
329 return 0;
330}
331
332int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
333{
334 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
335 ext_csd, 512);
336}
337
338int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
339{
340 struct mmc_command cmd = {0};
341 int err;
342
343 cmd.opcode = MMC_SPI_READ_OCR;
344 cmd.arg = highcap ? (1 << 30) : 0;
345 cmd.flags = MMC_RSP_SPI_R3;
346
347 err = mmc_wait_for_cmd(host, &cmd, 0);
348
349 *ocrp = cmd.resp[1];
350 return err;
351}
352
353int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
354{
355 struct mmc_command cmd = {0};
356 int err;
357
358 cmd.opcode = MMC_SPI_CRC_ON_OFF;
359 cmd.flags = MMC_RSP_SPI_R1;
360 cmd.arg = use_crc;
361
362 err = mmc_wait_for_cmd(host, &cmd, 0);
363 if (!err)
364 host->use_spi_crc = use_crc;
365 return err;
366}
367
368/**
369 * mmc_switch - modify EXT_CSD register
370 * @card: the MMC card associated with the data transfer
371 * @set: cmd set values
372 * @index: EXT_CSD register index
373 * @value: value to program into EXT_CSD register
374 * @timeout_ms: timeout (ms) for operation performed by register write,
375 * timeout of zero implies maximum possible timeout
376 *
377 * Modifies the EXT_CSD register for selected card.
378 */
379int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
380 unsigned int timeout_ms)
381{
382 int err;
383 struct mmc_command cmd = {0};
384 u32 status;
385
386 BUG_ON(!card);
387 BUG_ON(!card->host);
388
389 cmd.opcode = MMC_SWITCH;
390 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
391 (index << 16) |
392 (value << 8) |
393 set;
394 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
395 cmd.cmd_timeout_ms = timeout_ms;
396
397 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
398 if (err)
399 return err;
400
401 /* Must check status to be sure of no errors */
402 do {
403 err = mmc_send_status(card, &status);
404 if (err)
405 return err;
406 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
407 break;
408 if (mmc_host_is_spi(card->host))
409 break;
410 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
411
412 if (mmc_host_is_spi(card->host)) {
413 if (status & R1_SPI_ILLEGAL_COMMAND)
414 return -EBADMSG;
415 } else {
416 if (status & 0xFDFFA000)
417 printk(KERN_WARNING "%s: unexpected status %#x after "
418 "switch", mmc_hostname(card->host), status);
419 if (status & R1_SWITCH_ERROR)
420 return -EBADMSG;
421 }
422
423 return 0;
424}
425EXPORT_SYMBOL_GPL(mmc_switch);
426
427int mmc_send_status(struct mmc_card *card, u32 *status)
428{
429 int err;
430 struct mmc_command cmd = {0};
431
432 BUG_ON(!card);
433 BUG_ON(!card->host);
434
435 cmd.opcode = MMC_SEND_STATUS;
436 if (!mmc_host_is_spi(card->host))
437 cmd.arg = card->rca << 16;
438 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
439
440 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
441 if (err)
442 return err;
443
444 /* NOTE: callers are required to understand the difference
445 * between "native" and SPI format status words!
446 */
447 if (status)
448 *status = cmd.resp[0];
449
450 return 0;
451}
452
453static int
454mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
455 u8 len)
456{
457 struct mmc_request mrq = {0};
458 struct mmc_command cmd = {0};
459 struct mmc_data data = {0};
460 struct scatterlist sg;
461 u8 *data_buf;
462 u8 *test_buf;
463 int i, err;
464 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
465 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
466
467 /* dma onto stack is unsafe/nonportable, but callers to this
468 * routine normally provide temporary on-stack buffers ...
469 */
470 data_buf = kmalloc(len, GFP_KERNEL);
471 if (!data_buf)
472 return -ENOMEM;
473
474 if (len == 8)
475 test_buf = testdata_8bit;
476 else if (len == 4)
477 test_buf = testdata_4bit;
478 else {
479 printk(KERN_ERR "%s: Invalid bus_width %d\n",
480 mmc_hostname(host), len);
481 kfree(data_buf);
482 return -EINVAL;
483 }
484
485 if (opcode == MMC_BUS_TEST_W)
486 memcpy(data_buf, test_buf, len);
487
488 mrq.cmd = &cmd;
489 mrq.data = &data;
490 cmd.opcode = opcode;
491 cmd.arg = 0;
492
493 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
494 * rely on callers to never use this with "native" calls for reading
495 * CSD or CID. Native versions of those commands use the R2 type,
496 * not R1 plus a data block.
497 */
498 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
499
500 data.blksz = len;
501 data.blocks = 1;
502 if (opcode == MMC_BUS_TEST_R)
503 data.flags = MMC_DATA_READ;
504 else
505 data.flags = MMC_DATA_WRITE;
506
507 data.sg = &sg;
508 data.sg_len = 1;
509 sg_init_one(&sg, data_buf, len);
510 mmc_wait_for_req(host, &mrq);
511 err = 0;
512 if (opcode == MMC_BUS_TEST_R) {
513 for (i = 0; i < len / 4; i++)
514 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
515 err = -EIO;
516 break;
517 }
518 }
519 kfree(data_buf);
520
521 if (cmd.error)
522 return cmd.error;
523 if (data.error)
524 return data.error;
525
526 return err;
527}
528
529int mmc_bus_test(struct mmc_card *card, u8 bus_width)
530{
531 int err, width;
532
533 if (bus_width == MMC_BUS_WIDTH_8)
534 width = 8;
535 else if (bus_width == MMC_BUS_WIDTH_4)
536 width = 4;
537 else if (bus_width == MMC_BUS_WIDTH_1)
538 return 0; /* no need for test */
539 else
540 return -EINVAL;
541
542 /*
543 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
544 * is a problem. This improves chances that the test will work.
545 */
546 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
547 err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
548 return err;
549}
1/*
2 * linux/drivers/mmc/core/mmc_ops.h
3 *
4 * Copyright 2006-2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/slab.h>
13#include <linux/export.h>
14#include <linux/types.h>
15#include <linux/scatterlist.h>
16
17#include <linux/mmc/host.h>
18#include <linux/mmc/card.h>
19#include <linux/mmc/mmc.h>
20
21#include "core.h"
22#include "mmc_ops.h"
23
24static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
25{
26 int err;
27 struct mmc_command cmd = {0};
28
29 BUG_ON(!host);
30
31 cmd.opcode = MMC_SELECT_CARD;
32
33 if (card) {
34 cmd.arg = card->rca << 16;
35 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
36 } else {
37 cmd.arg = 0;
38 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
39 }
40
41 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
42 if (err)
43 return err;
44
45 return 0;
46}
47
48int mmc_select_card(struct mmc_card *card)
49{
50 BUG_ON(!card);
51
52 return _mmc_select_card(card->host, card);
53}
54
55int mmc_deselect_cards(struct mmc_host *host)
56{
57 return _mmc_select_card(host, NULL);
58}
59
60int mmc_card_sleepawake(struct mmc_host *host, int sleep)
61{
62 struct mmc_command cmd = {0};
63 struct mmc_card *card = host->card;
64 int err;
65
66 if (sleep)
67 mmc_deselect_cards(host);
68
69 cmd.opcode = MMC_SLEEP_AWAKE;
70 cmd.arg = card->rca << 16;
71 if (sleep)
72 cmd.arg |= 1 << 15;
73
74 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
75 err = mmc_wait_for_cmd(host, &cmd, 0);
76 if (err)
77 return err;
78
79 /*
80 * If the host does not wait while the card signals busy, then we will
81 * will have to wait the sleep/awake timeout. Note, we cannot use the
82 * SEND_STATUS command to poll the status because that command (and most
83 * others) is invalid while the card sleeps.
84 */
85 if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
86 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
87
88 if (!sleep)
89 err = mmc_select_card(card);
90
91 return err;
92}
93
94int mmc_go_idle(struct mmc_host *host)
95{
96 int err;
97 struct mmc_command cmd = {0};
98
99 /*
100 * Non-SPI hosts need to prevent chipselect going active during
101 * GO_IDLE; that would put chips into SPI mode. Remind them of
102 * that in case of hardware that won't pull up DAT3/nCS otherwise.
103 *
104 * SPI hosts ignore ios.chip_select; it's managed according to
105 * rules that must accommodate non-MMC slaves which this layer
106 * won't even know about.
107 */
108 if (!mmc_host_is_spi(host)) {
109 mmc_set_chip_select(host, MMC_CS_HIGH);
110 mmc_delay(1);
111 }
112
113 cmd.opcode = MMC_GO_IDLE_STATE;
114 cmd.arg = 0;
115 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
116
117 err = mmc_wait_for_cmd(host, &cmd, 0);
118
119 mmc_delay(1);
120
121 if (!mmc_host_is_spi(host)) {
122 mmc_set_chip_select(host, MMC_CS_DONTCARE);
123 mmc_delay(1);
124 }
125
126 host->use_spi_crc = 0;
127
128 return err;
129}
130
131int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
132{
133 struct mmc_command cmd = {0};
134 int i, err = 0;
135
136 BUG_ON(!host);
137
138 cmd.opcode = MMC_SEND_OP_COND;
139 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
140 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
141
142 for (i = 100; i; i--) {
143 err = mmc_wait_for_cmd(host, &cmd, 0);
144 if (err)
145 break;
146
147 /* if we're just probing, do a single pass */
148 if (ocr == 0)
149 break;
150
151 /* otherwise wait until reset completes */
152 if (mmc_host_is_spi(host)) {
153 if (!(cmd.resp[0] & R1_SPI_IDLE))
154 break;
155 } else {
156 if (cmd.resp[0] & MMC_CARD_BUSY)
157 break;
158 }
159
160 err = -ETIMEDOUT;
161
162 mmc_delay(10);
163 }
164
165 if (rocr && !mmc_host_is_spi(host))
166 *rocr = cmd.resp[0];
167
168 return err;
169}
170
171int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
172{
173 int err;
174 struct mmc_command cmd = {0};
175
176 BUG_ON(!host);
177 BUG_ON(!cid);
178
179 cmd.opcode = MMC_ALL_SEND_CID;
180 cmd.arg = 0;
181 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
182
183 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
184 if (err)
185 return err;
186
187 memcpy(cid, cmd.resp, sizeof(u32) * 4);
188
189 return 0;
190}
191
192int mmc_set_relative_addr(struct mmc_card *card)
193{
194 int err;
195 struct mmc_command cmd = {0};
196
197 BUG_ON(!card);
198 BUG_ON(!card->host);
199
200 cmd.opcode = MMC_SET_RELATIVE_ADDR;
201 cmd.arg = card->rca << 16;
202 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
203
204 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
205 if (err)
206 return err;
207
208 return 0;
209}
210
211static int
212mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
213{
214 int err;
215 struct mmc_command cmd = {0};
216
217 BUG_ON(!host);
218 BUG_ON(!cxd);
219
220 cmd.opcode = opcode;
221 cmd.arg = arg;
222 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
223
224 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
225 if (err)
226 return err;
227
228 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
229
230 return 0;
231}
232
233static int
234mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
235 u32 opcode, void *buf, unsigned len)
236{
237 struct mmc_request mrq = {NULL};
238 struct mmc_command cmd = {0};
239 struct mmc_data data = {0};
240 struct scatterlist sg;
241 void *data_buf;
242
243 /* dma onto stack is unsafe/nonportable, but callers to this
244 * routine normally provide temporary on-stack buffers ...
245 */
246 data_buf = kmalloc(len, GFP_KERNEL);
247 if (data_buf == NULL)
248 return -ENOMEM;
249
250 mrq.cmd = &cmd;
251 mrq.data = &data;
252
253 cmd.opcode = opcode;
254 cmd.arg = 0;
255
256 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
257 * rely on callers to never use this with "native" calls for reading
258 * CSD or CID. Native versions of those commands use the R2 type,
259 * not R1 plus a data block.
260 */
261 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
262
263 data.blksz = len;
264 data.blocks = 1;
265 data.flags = MMC_DATA_READ;
266 data.sg = &sg;
267 data.sg_len = 1;
268
269 sg_init_one(&sg, data_buf, len);
270
271 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
272 /*
273 * The spec states that CSR and CID accesses have a timeout
274 * of 64 clock cycles.
275 */
276 data.timeout_ns = 0;
277 data.timeout_clks = 64;
278 } else
279 mmc_set_data_timeout(&data, card);
280
281 mmc_wait_for_req(host, &mrq);
282
283 memcpy(buf, data_buf, len);
284 kfree(data_buf);
285
286 if (cmd.error)
287 return cmd.error;
288 if (data.error)
289 return data.error;
290
291 return 0;
292}
293
294int mmc_send_csd(struct mmc_card *card, u32 *csd)
295{
296 int ret, i;
297
298 if (!mmc_host_is_spi(card->host))
299 return mmc_send_cxd_native(card->host, card->rca << 16,
300 csd, MMC_SEND_CSD);
301
302 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
303 if (ret)
304 return ret;
305
306 for (i = 0;i < 4;i++)
307 csd[i] = be32_to_cpu(csd[i]);
308
309 return 0;
310}
311
312int mmc_send_cid(struct mmc_host *host, u32 *cid)
313{
314 int ret, i;
315
316 if (!mmc_host_is_spi(host)) {
317 if (!host->card)
318 return -EINVAL;
319 return mmc_send_cxd_native(host, host->card->rca << 16,
320 cid, MMC_SEND_CID);
321 }
322
323 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
324 if (ret)
325 return ret;
326
327 for (i = 0;i < 4;i++)
328 cid[i] = be32_to_cpu(cid[i]);
329
330 return 0;
331}
332
333int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
334{
335 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
336 ext_csd, 512);
337}
338
339int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
340{
341 struct mmc_command cmd = {0};
342 int err;
343
344 cmd.opcode = MMC_SPI_READ_OCR;
345 cmd.arg = highcap ? (1 << 30) : 0;
346 cmd.flags = MMC_RSP_SPI_R3;
347
348 err = mmc_wait_for_cmd(host, &cmd, 0);
349
350 *ocrp = cmd.resp[1];
351 return err;
352}
353
354int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
355{
356 struct mmc_command cmd = {0};
357 int err;
358
359 cmd.opcode = MMC_SPI_CRC_ON_OFF;
360 cmd.flags = MMC_RSP_SPI_R1;
361 cmd.arg = use_crc;
362
363 err = mmc_wait_for_cmd(host, &cmd, 0);
364 if (!err)
365 host->use_spi_crc = use_crc;
366 return err;
367}
368
369/**
370 * mmc_switch - modify EXT_CSD register
371 * @card: the MMC card associated with the data transfer
372 * @set: cmd set values
373 * @index: EXT_CSD register index
374 * @value: value to program into EXT_CSD register
375 * @timeout_ms: timeout (ms) for operation performed by register write,
376 * timeout of zero implies maximum possible timeout
377 *
378 * Modifies the EXT_CSD register for selected card.
379 */
380int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
381 unsigned int timeout_ms)
382{
383 int err;
384 struct mmc_command cmd = {0};
385 u32 status;
386
387 BUG_ON(!card);
388 BUG_ON(!card->host);
389
390 cmd.opcode = MMC_SWITCH;
391 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
392 (index << 16) |
393 (value << 8) |
394 set;
395 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
396 cmd.cmd_timeout_ms = timeout_ms;
397
398 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
399 if (err)
400 return err;
401
402 /* Must check status to be sure of no errors */
403 do {
404 err = mmc_send_status(card, &status);
405 if (err)
406 return err;
407 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
408 break;
409 if (mmc_host_is_spi(card->host))
410 break;
411 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
412
413 if (mmc_host_is_spi(card->host)) {
414 if (status & R1_SPI_ILLEGAL_COMMAND)
415 return -EBADMSG;
416 } else {
417 if (status & 0xFDFFA000)
418 pr_warning("%s: unexpected status %#x after "
419 "switch", mmc_hostname(card->host), status);
420 if (status & R1_SWITCH_ERROR)
421 return -EBADMSG;
422 }
423
424 return 0;
425}
426EXPORT_SYMBOL_GPL(mmc_switch);
427
428int mmc_send_status(struct mmc_card *card, u32 *status)
429{
430 int err;
431 struct mmc_command cmd = {0};
432
433 BUG_ON(!card);
434 BUG_ON(!card->host);
435
436 cmd.opcode = MMC_SEND_STATUS;
437 if (!mmc_host_is_spi(card->host))
438 cmd.arg = card->rca << 16;
439 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
440
441 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
442 if (err)
443 return err;
444
445 /* NOTE: callers are required to understand the difference
446 * between "native" and SPI format status words!
447 */
448 if (status)
449 *status = cmd.resp[0];
450
451 return 0;
452}
453
454static int
455mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
456 u8 len)
457{
458 struct mmc_request mrq = {NULL};
459 struct mmc_command cmd = {0};
460 struct mmc_data data = {0};
461 struct scatterlist sg;
462 u8 *data_buf;
463 u8 *test_buf;
464 int i, err;
465 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
466 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
467
468 /* dma onto stack is unsafe/nonportable, but callers to this
469 * routine normally provide temporary on-stack buffers ...
470 */
471 data_buf = kmalloc(len, GFP_KERNEL);
472 if (!data_buf)
473 return -ENOMEM;
474
475 if (len == 8)
476 test_buf = testdata_8bit;
477 else if (len == 4)
478 test_buf = testdata_4bit;
479 else {
480 pr_err("%s: Invalid bus_width %d\n",
481 mmc_hostname(host), len);
482 kfree(data_buf);
483 return -EINVAL;
484 }
485
486 if (opcode == MMC_BUS_TEST_W)
487 memcpy(data_buf, test_buf, len);
488
489 mrq.cmd = &cmd;
490 mrq.data = &data;
491 cmd.opcode = opcode;
492 cmd.arg = 0;
493
494 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
495 * rely on callers to never use this with "native" calls for reading
496 * CSD or CID. Native versions of those commands use the R2 type,
497 * not R1 plus a data block.
498 */
499 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
500
501 data.blksz = len;
502 data.blocks = 1;
503 if (opcode == MMC_BUS_TEST_R)
504 data.flags = MMC_DATA_READ;
505 else
506 data.flags = MMC_DATA_WRITE;
507
508 data.sg = &sg;
509 data.sg_len = 1;
510 sg_init_one(&sg, data_buf, len);
511 mmc_wait_for_req(host, &mrq);
512 err = 0;
513 if (opcode == MMC_BUS_TEST_R) {
514 for (i = 0; i < len / 4; i++)
515 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
516 err = -EIO;
517 break;
518 }
519 }
520 kfree(data_buf);
521
522 if (cmd.error)
523 return cmd.error;
524 if (data.error)
525 return data.error;
526
527 return err;
528}
529
530int mmc_bus_test(struct mmc_card *card, u8 bus_width)
531{
532 int err, width;
533
534 if (bus_width == MMC_BUS_WIDTH_8)
535 width = 8;
536 else if (bus_width == MMC_BUS_WIDTH_4)
537 width = 4;
538 else if (bus_width == MMC_BUS_WIDTH_1)
539 return 0; /* no need for test */
540 else
541 return -EINVAL;
542
543 /*
544 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
545 * is a problem. This improves chances that the test will work.
546 */
547 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
548 err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
549 return err;
550}
551
552int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
553{
554 struct mmc_command cmd = {0};
555 unsigned int opcode;
556 int err;
557
558 if (!card->ext_csd.hpi) {
559 pr_warning("%s: Card didn't support HPI command\n",
560 mmc_hostname(card->host));
561 return -EINVAL;
562 }
563
564 opcode = card->ext_csd.hpi_cmd;
565 if (opcode == MMC_STOP_TRANSMISSION)
566 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
567 else if (opcode == MMC_SEND_STATUS)
568 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
569
570 cmd.opcode = opcode;
571 cmd.arg = card->rca << 16 | 1;
572 cmd.cmd_timeout_ms = card->ext_csd.out_of_int_time;
573
574 err = mmc_wait_for_cmd(card->host, &cmd, 0);
575 if (err) {
576 pr_warn("%s: error %d interrupting operation. "
577 "HPI command response %#x\n", mmc_hostname(card->host),
578 err, cmd.resp[0]);
579 return err;
580 }
581 if (status)
582 *status = cmd.resp[0];
583
584 return 0;
585}