1 /*
2 * linux/drivers/mmc/core/sd_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/export.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 #include <linux/mmc/sd.h>
21
22 #include "core.h"
23 #include "sd_ops.h"
24
mmc_app_cmd(struct mmc_host * host,struct mmc_card * card)25 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
26 {
27 int err;
28 struct mmc_command cmd = {0};
29
30 BUG_ON(!host);
31 BUG_ON(card && (card->host != host));
32
33 cmd.opcode = MMC_APP_CMD;
34
35 if (card) {
36 cmd.arg = card->rca << 16;
37 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
38 } else {
39 cmd.arg = 0;
40 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
41 }
42
43 err = mmc_wait_for_cmd(host, &cmd, 0);
44 if (err)
45 return err;
46
47 /* Check that card supported application commands */
48 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
49 return -EOPNOTSUPP;
50
51 return 0;
52 }
53 EXPORT_SYMBOL_GPL(mmc_app_cmd);
54
55 /**
56 * mmc_wait_for_app_cmd - start an application command and wait for
57 completion
58 * @host: MMC host to start command
59 * @card: Card to send MMC_APP_CMD to
60 * @cmd: MMC command to start
61 * @retries: maximum number of retries
62 *
63 * Sends a MMC_APP_CMD, checks the card response, sends the command
64 * in the parameter and waits for it to complete. Return any error
65 * that occurred while the command was executing. Do not attempt to
66 * parse the response.
67 */
mmc_wait_for_app_cmd(struct mmc_host * host,struct mmc_card * card,struct mmc_command * cmd,int retries)68 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
69 struct mmc_command *cmd, int retries)
70 {
71 struct mmc_request mrq = {NULL};
72
73 int i, err;
74
75 BUG_ON(!cmd);
76 BUG_ON(retries < 0);
77
78 err = -EIO;
79
80 /*
81 * We have to resend MMC_APP_CMD for each attempt so
82 * we cannot use the retries field in mmc_command.
83 */
84 for (i = 0;i <= retries;i++) {
85 err = mmc_app_cmd(host, card);
86 if (err) {
87 /* no point in retrying; no APP commands allowed */
88 if (mmc_host_is_spi(host)) {
89 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
90 break;
91 }
92 continue;
93 }
94
95 memset(&mrq, 0, sizeof(struct mmc_request));
96
97 memset(cmd->resp, 0, sizeof(cmd->resp));
98 cmd->retries = 0;
99
100 mrq.cmd = cmd;
101 cmd->data = NULL;
102
103 mmc_wait_for_req(host, &mrq);
104
105 err = cmd->error;
106 if (!cmd->error)
107 break;
108
109 /* no point in retrying illegal APP commands */
110 if (mmc_host_is_spi(host)) {
111 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
112 break;
113 }
114 }
115
116 return err;
117 }
118
119 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
120
mmc_app_set_bus_width(struct mmc_card * card,int width)121 int mmc_app_set_bus_width(struct mmc_card *card, int width)
122 {
123 int err;
124 struct mmc_command cmd = {0};
125
126 BUG_ON(!card);
127 BUG_ON(!card->host);
128
129 cmd.opcode = SD_APP_SET_BUS_WIDTH;
130 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
131
132 switch (width) {
133 case MMC_BUS_WIDTH_1:
134 cmd.arg = SD_BUS_WIDTH_1;
135 break;
136 case MMC_BUS_WIDTH_4:
137 cmd.arg = SD_BUS_WIDTH_4;
138 break;
139 default:
140 return -EINVAL;
141 }
142
143 err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
144 if (err)
145 return err;
146
147 return 0;
148 }
149
mmc_send_app_op_cond(struct mmc_host * host,u32 ocr,u32 * rocr)150 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
151 {
152 struct mmc_command cmd = {0};
153 int i, err = 0;
154
155 BUG_ON(!host);
156
157 cmd.opcode = SD_APP_OP_COND;
158 if (mmc_host_is_spi(host))
159 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
160 else
161 cmd.arg = ocr;
162 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
163
164 for (i = 100; i; i--) {
165 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
166 if (err)
167 break;
168
169 /* if we're just probing, do a single pass */
170 if (ocr == 0)
171 break;
172
173 /* otherwise wait until reset completes */
174 if (mmc_host_is_spi(host)) {
175 if (!(cmd.resp[0] & R1_SPI_IDLE))
176 break;
177 } else {
178 if (cmd.resp[0] & MMC_CARD_BUSY)
179 break;
180 }
181
182 err = -ETIMEDOUT;
183
184 mmc_delay(10);
185 }
186
187 if (!i)
188 pr_err("%s: card never left busy state\n", mmc_hostname(host));
189
190 if (rocr && !mmc_host_is_spi(host))
191 *rocr = cmd.resp[0];
192
193 return err;
194 }
195
mmc_send_if_cond(struct mmc_host * host,u32 ocr)196 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
197 {
198 struct mmc_command cmd = {0};
199 int err;
200 static const u8 test_pattern = 0xAA;
201 u8 result_pattern;
202
203 /*
204 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
205 * before SD_APP_OP_COND. This command will harmlessly fail for
206 * SD 1.0 cards.
207 */
208 cmd.opcode = SD_SEND_IF_COND;
209 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
210 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
211
212 err = mmc_wait_for_cmd(host, &cmd, 0);
213 if (err)
214 return err;
215
216 if (mmc_host_is_spi(host))
217 result_pattern = cmd.resp[1] & 0xFF;
218 else
219 result_pattern = cmd.resp[0] & 0xFF;
220
221 if (result_pattern != test_pattern)
222 return -EIO;
223
224 return 0;
225 }
226
mmc_send_relative_addr(struct mmc_host * host,unsigned int * rca)227 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
228 {
229 int err;
230 struct mmc_command cmd = {0};
231
232 BUG_ON(!host);
233 BUG_ON(!rca);
234
235 cmd.opcode = SD_SEND_RELATIVE_ADDR;
236 cmd.arg = 0;
237 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
238
239 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
240 if (err)
241 return err;
242
243 *rca = cmd.resp[0] >> 16;
244
245 return 0;
246 }
247
mmc_app_send_scr(struct mmc_card * card,u32 * scr)248 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
249 {
250 int err;
251 struct mmc_request mrq = {NULL};
252 struct mmc_command cmd = {0};
253 struct mmc_data data = {0};
254 struct scatterlist sg;
255 void *data_buf;
256
257 BUG_ON(!card);
258 BUG_ON(!card->host);
259 BUG_ON(!scr);
260
261 /* NOTE: caller guarantees scr is heap-allocated */
262
263 err = mmc_app_cmd(card->host, card);
264 if (err)
265 return err;
266
267 /* dma onto stack is unsafe/nonportable, but callers to this
268 * routine normally provide temporary on-stack buffers ...
269 */
270 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
271 if (data_buf == NULL)
272 return -ENOMEM;
273
274 mrq.cmd = &cmd;
275 mrq.data = &data;
276
277 cmd.opcode = SD_APP_SEND_SCR;
278 cmd.arg = 0;
279 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
280
281 data.blksz = 8;
282 data.blocks = 1;
283 data.flags = MMC_DATA_READ;
284 data.sg = &sg;
285 data.sg_len = 1;
286
287 sg_init_one(&sg, data_buf, 8);
288
289 mmc_set_data_timeout(&data, card);
290
291 mmc_wait_for_req(card->host, &mrq);
292
293 memcpy(scr, data_buf, sizeof(card->raw_scr));
294 kfree(data_buf);
295
296 if (cmd.error)
297 return cmd.error;
298 if (data.error)
299 return data.error;
300
301 scr[0] = be32_to_cpu(scr[0]);
302 scr[1] = be32_to_cpu(scr[1]);
303
304 return 0;
305 }
306
mmc_sd_switch(struct mmc_card * card,int mode,int group,u8 value,u8 * resp)307 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
308 u8 value, u8 *resp)
309 {
310 struct mmc_request mrq = {NULL};
311 struct mmc_command cmd = {0};
312 struct mmc_data data = {0};
313 struct scatterlist sg;
314
315 BUG_ON(!card);
316 BUG_ON(!card->host);
317
318 /* NOTE: caller guarantees resp is heap-allocated */
319
320 mode = !!mode;
321 value &= 0xF;
322
323 mrq.cmd = &cmd;
324 mrq.data = &data;
325
326 cmd.opcode = SD_SWITCH;
327 cmd.arg = mode << 31 | 0x00FFFFFF;
328 cmd.arg &= ~(0xF << (group * 4));
329 cmd.arg |= value << (group * 4);
330 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
331
332 data.blksz = 64;
333 data.blocks = 1;
334 data.flags = MMC_DATA_READ;
335 data.sg = &sg;
336 data.sg_len = 1;
337
338 sg_init_one(&sg, resp, 64);
339
340 mmc_set_data_timeout(&data, card);
341
342 mmc_wait_for_req(card->host, &mrq);
343
344 if (cmd.error)
345 return cmd.error;
346 if (data.error)
347 return data.error;
348
349 return 0;
350 }
351
mmc_app_sd_status(struct mmc_card * card,void * ssr)352 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
353 {
354 int err;
355 struct mmc_request mrq = {NULL};
356 struct mmc_command cmd = {0};
357 struct mmc_data data = {0};
358 struct scatterlist sg;
359
360 BUG_ON(!card);
361 BUG_ON(!card->host);
362 BUG_ON(!ssr);
363
364 /* NOTE: caller guarantees ssr is heap-allocated */
365
366 err = mmc_app_cmd(card->host, card);
367 if (err)
368 return err;
369
370 mrq.cmd = &cmd;
371 mrq.data = &data;
372
373 cmd.opcode = SD_APP_SD_STATUS;
374 cmd.arg = 0;
375 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
376
377 data.blksz = 64;
378 data.blocks = 1;
379 data.flags = MMC_DATA_READ;
380 data.sg = &sg;
381 data.sg_len = 1;
382
383 sg_init_one(&sg, ssr, 64);
384
385 mmc_set_data_timeout(&data, card);
386
387 mmc_wait_for_req(card->host, &mrq);
388
389 if (cmd.error)
390 return cmd.error;
391 if (data.error)
392 return data.error;
393
394 return 0;
395 }
396