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/types.h>
13 #include <linux/scatterlist.h>
14
15 #include <linux/mmc/host.h>
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/mmc.h>
18
19 #include "core.h"
20 #include "mmc_ops.h"
21
_mmc_select_card(struct mmc_host * host,struct mmc_card * card)22 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
23 {
24 int err;
25 struct mmc_command cmd;
26
27 BUG_ON(!host);
28
29 memset(&cmd, 0, sizeof(struct mmc_command));
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
mmc_select_card(struct mmc_card * card)48 int mmc_select_card(struct mmc_card *card)
49 {
50 BUG_ON(!card);
51
52 return _mmc_select_card(card->host, card);
53 }
54
mmc_deselect_cards(struct mmc_host * host)55 int mmc_deselect_cards(struct mmc_host *host)
56 {
57 return _mmc_select_card(host, NULL);
58 }
59
mmc_go_idle(struct mmc_host * host)60 int mmc_go_idle(struct mmc_host *host)
61 {
62 int err;
63 struct mmc_command cmd;
64
65 /*
66 * Non-SPI hosts need to prevent chipselect going active during
67 * GO_IDLE; that would put chips into SPI mode. Remind them of
68 * that in case of hardware that won't pull up DAT3/nCS otherwise.
69 *
70 * SPI hosts ignore ios.chip_select; it's managed according to
71 * rules that must accomodate non-MMC slaves which this layer
72 * won't even know about.
73 */
74 if (!mmc_host_is_spi(host)) {
75 mmc_set_chip_select(host, MMC_CS_HIGH);
76 mmc_delay(1);
77 }
78
79 memset(&cmd, 0, sizeof(struct mmc_command));
80
81 cmd.opcode = MMC_GO_IDLE_STATE;
82 cmd.arg = 0;
83 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
84
85 err = mmc_wait_for_cmd(host, &cmd, 0);
86
87 mmc_delay(1);
88
89 if (!mmc_host_is_spi(host)) {
90 mmc_set_chip_select(host, MMC_CS_DONTCARE);
91 mmc_delay(1);
92 }
93
94 host->use_spi_crc = 0;
95
96 return err;
97 }
98
mmc_send_op_cond(struct mmc_host * host,u32 ocr,u32 * rocr)99 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
100 {
101 struct mmc_command cmd;
102 int i, err = 0;
103
104 BUG_ON(!host);
105
106 memset(&cmd, 0, sizeof(struct mmc_command));
107
108 cmd.opcode = MMC_SEND_OP_COND;
109 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
110 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
111
112 for (i = 100; i; i--) {
113 err = mmc_wait_for_cmd(host, &cmd, 0);
114 if (err)
115 break;
116
117 /* if we're just probing, do a single pass */
118 if (ocr == 0)
119 break;
120
121 /* otherwise wait until reset completes */
122 if (mmc_host_is_spi(host)) {
123 if (!(cmd.resp[0] & R1_SPI_IDLE))
124 break;
125 } else {
126 if (cmd.resp[0] & MMC_CARD_BUSY)
127 break;
128 }
129
130 err = -ETIMEDOUT;
131
132 mmc_delay(10);
133 }
134
135 if (rocr && !mmc_host_is_spi(host))
136 *rocr = cmd.resp[0];
137
138 return err;
139 }
140
mmc_all_send_cid(struct mmc_host * host,u32 * cid)141 int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
142 {
143 int err;
144 struct mmc_command cmd;
145
146 BUG_ON(!host);
147 BUG_ON(!cid);
148
149 memset(&cmd, 0, sizeof(struct mmc_command));
150
151 cmd.opcode = MMC_ALL_SEND_CID;
152 cmd.arg = 0;
153 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
154
155 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
156 if (err)
157 return err;
158
159 memcpy(cid, cmd.resp, sizeof(u32) * 4);
160
161 return 0;
162 }
163
mmc_set_relative_addr(struct mmc_card * card)164 int mmc_set_relative_addr(struct mmc_card *card)
165 {
166 int err;
167 struct mmc_command cmd;
168
169 BUG_ON(!card);
170 BUG_ON(!card->host);
171
172 memset(&cmd, 0, sizeof(struct mmc_command));
173
174 cmd.opcode = MMC_SET_RELATIVE_ADDR;
175 cmd.arg = card->rca << 16;
176 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
177
178 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
179 if (err)
180 return err;
181
182 return 0;
183 }
184
185 static int
mmc_send_cxd_native(struct mmc_host * host,u32 arg,u32 * cxd,int opcode)186 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
187 {
188 int err;
189 struct mmc_command cmd;
190
191 BUG_ON(!host);
192 BUG_ON(!cxd);
193
194 memset(&cmd, 0, sizeof(struct mmc_command));
195
196 cmd.opcode = opcode;
197 cmd.arg = arg;
198 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
199
200 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
201 if (err)
202 return err;
203
204 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
205
206 return 0;
207 }
208
209 static int
mmc_send_cxd_data(struct mmc_card * card,struct mmc_host * host,u32 opcode,void * buf,unsigned len)210 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
211 u32 opcode, void *buf, unsigned len)
212 {
213 struct mmc_request mrq;
214 struct mmc_command cmd;
215 struct mmc_data data;
216 struct scatterlist sg;
217 void *data_buf;
218
219 /* dma onto stack is unsafe/nonportable, but callers to this
220 * routine normally provide temporary on-stack buffers ...
221 */
222 data_buf = kmalloc(len, GFP_KERNEL);
223 if (data_buf == NULL)
224 return -ENOMEM;
225
226 memset(&mrq, 0, sizeof(struct mmc_request));
227 memset(&cmd, 0, sizeof(struct mmc_command));
228 memset(&data, 0, sizeof(struct mmc_data));
229
230 mrq.cmd = &cmd;
231 mrq.data = &data;
232
233 cmd.opcode = opcode;
234 cmd.arg = 0;
235
236 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
237 * rely on callers to never use this with "native" calls for reading
238 * CSD or CID. Native versions of those commands use the R2 type,
239 * not R1 plus a data block.
240 */
241 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
242
243 data.blksz = len;
244 data.blocks = 1;
245 data.flags = MMC_DATA_READ;
246 data.sg = &sg;
247 data.sg_len = 1;
248
249 sg_init_one(&sg, data_buf, len);
250
251 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
252 /*
253 * The spec states that CSR and CID accesses have a timeout
254 * of 64 clock cycles.
255 */
256 data.timeout_ns = 0;
257 data.timeout_clks = 64;
258 } else
259 mmc_set_data_timeout(&data, card);
260
261 mmc_wait_for_req(host, &mrq);
262
263 memcpy(buf, data_buf, len);
264 kfree(data_buf);
265
266 if (cmd.error)
267 return cmd.error;
268 if (data.error)
269 return data.error;
270
271 return 0;
272 }
273
mmc_send_csd(struct mmc_card * card,u32 * csd)274 int mmc_send_csd(struct mmc_card *card, u32 *csd)
275 {
276 int ret, i;
277
278 if (!mmc_host_is_spi(card->host))
279 return mmc_send_cxd_native(card->host, card->rca << 16,
280 csd, MMC_SEND_CSD);
281
282 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
283 if (ret)
284 return ret;
285
286 for (i = 0;i < 4;i++)
287 csd[i] = be32_to_cpu(csd[i]);
288
289 return 0;
290 }
291
mmc_send_cid(struct mmc_host * host,u32 * cid)292 int mmc_send_cid(struct mmc_host *host, u32 *cid)
293 {
294 int ret, i;
295
296 if (!mmc_host_is_spi(host)) {
297 if (!host->card)
298 return -EINVAL;
299 return mmc_send_cxd_native(host, host->card->rca << 16,
300 cid, MMC_SEND_CID);
301 }
302
303 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
304 if (ret)
305 return ret;
306
307 for (i = 0;i < 4;i++)
308 cid[i] = be32_to_cpu(cid[i]);
309
310 return 0;
311 }
312
mmc_send_ext_csd(struct mmc_card * card,u8 * ext_csd)313 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
314 {
315 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
316 ext_csd, 512);
317 }
318
mmc_spi_read_ocr(struct mmc_host * host,int highcap,u32 * ocrp)319 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
320 {
321 struct mmc_command cmd;
322 int err;
323
324 memset(&cmd, 0, sizeof(struct mmc_command));
325
326 cmd.opcode = MMC_SPI_READ_OCR;
327 cmd.arg = highcap ? (1 << 30) : 0;
328 cmd.flags = MMC_RSP_SPI_R3;
329
330 err = mmc_wait_for_cmd(host, &cmd, 0);
331
332 *ocrp = cmd.resp[1];
333 return err;
334 }
335
mmc_spi_set_crc(struct mmc_host * host,int use_crc)336 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
337 {
338 struct mmc_command cmd;
339 int err;
340
341 memset(&cmd, 0, sizeof(struct mmc_command));
342
343 cmd.opcode = MMC_SPI_CRC_ON_OFF;
344 cmd.flags = MMC_RSP_SPI_R1;
345 cmd.arg = use_crc;
346
347 err = mmc_wait_for_cmd(host, &cmd, 0);
348 if (!err)
349 host->use_spi_crc = use_crc;
350 return err;
351 }
352
mmc_switch(struct mmc_card * card,u8 set,u8 index,u8 value)353 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
354 {
355 int err;
356 struct mmc_command cmd;
357
358 BUG_ON(!card);
359 BUG_ON(!card->host);
360
361 memset(&cmd, 0, sizeof(struct mmc_command));
362
363 cmd.opcode = MMC_SWITCH;
364 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
365 (index << 16) |
366 (value << 8) |
367 set;
368 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
369
370 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
371 if (err)
372 return err;
373
374 return 0;
375 }
376
mmc_send_status(struct mmc_card * card,u32 * status)377 int mmc_send_status(struct mmc_card *card, u32 *status)
378 {
379 int err;
380 struct mmc_command cmd;
381
382 BUG_ON(!card);
383 BUG_ON(!card->host);
384
385 memset(&cmd, 0, sizeof(struct mmc_command));
386
387 cmd.opcode = MMC_SEND_STATUS;
388 if (!mmc_host_is_spi(card->host))
389 cmd.arg = card->rca << 16;
390 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
391
392 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
393 if (err)
394 return err;
395
396 /* NOTE: callers are required to understand the difference
397 * between "native" and SPI format status words!
398 */
399 if (status)
400 *status = cmd.resp[0];
401
402 return 0;
403 }
404
405