1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * linux/drivers/mmc/core/sd_ops.h
4 *
5 * Copyright 2006-2007 Pierre Ossman
6 */
7
8 #include <linux/slab.h>
9 #include <linux/types.h>
10 #include <linux/export.h>
11 #include <linux/scatterlist.h>
12
13 #include <linux/mmc/host.h>
14 #include <linux/mmc/card.h>
15 #include <linux/mmc/mmc.h>
16 #include <linux/mmc/sd.h>
17
18 #include "core.h"
19 #include "sd_ops.h"
20 #include "mmc_ops.h"
21
mmc_app_cmd(struct mmc_host * host,struct mmc_card * card)22 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
23 {
24 int err;
25 struct mmc_command cmd = {};
26
27 if (WARN_ON(card && card->host != host))
28 return -EINVAL;
29
30 cmd.opcode = MMC_APP_CMD;
31
32 if (card) {
33 cmd.arg = card->rca << 16;
34 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
35 } else {
36 cmd.arg = 0;
37 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
38 }
39
40 err = mmc_wait_for_cmd(host, &cmd, 0);
41 if (err)
42 return err;
43
44 /* Check that card supported application commands */
45 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
46 return -EOPNOTSUPP;
47
48 return 0;
49 }
50 EXPORT_SYMBOL_GPL(mmc_app_cmd);
51
mmc_wait_for_app_cmd(struct mmc_host * host,struct mmc_card * card,struct mmc_command * cmd)52 static int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
53 struct mmc_command *cmd)
54 {
55 struct mmc_request mrq = {};
56 int i, err = -EIO;
57
58 /*
59 * We have to resend MMC_APP_CMD for each attempt so
60 * we cannot use the retries field in mmc_command.
61 */
62 for (i = 0; i <= MMC_CMD_RETRIES; i++) {
63 err = mmc_app_cmd(host, card);
64 if (err) {
65 /* no point in retrying; no APP commands allowed */
66 if (mmc_host_is_spi(host)) {
67 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
68 break;
69 }
70 continue;
71 }
72
73 memset(&mrq, 0, sizeof(struct mmc_request));
74
75 memset(cmd->resp, 0, sizeof(cmd->resp));
76 cmd->retries = 0;
77
78 mrq.cmd = cmd;
79 cmd->data = NULL;
80
81 mmc_wait_for_req(host, &mrq);
82
83 err = cmd->error;
84 if (!cmd->error)
85 break;
86
87 /* no point in retrying illegal APP commands */
88 if (mmc_host_is_spi(host)) {
89 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
90 break;
91 }
92 }
93
94 return err;
95 }
96
mmc_app_set_bus_width(struct mmc_card * card,int width)97 int mmc_app_set_bus_width(struct mmc_card *card, int width)
98 {
99 struct mmc_command cmd = {};
100
101 cmd.opcode = SD_APP_SET_BUS_WIDTH;
102 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
103
104 switch (width) {
105 case MMC_BUS_WIDTH_1:
106 cmd.arg = SD_BUS_WIDTH_1;
107 break;
108 case MMC_BUS_WIDTH_4:
109 cmd.arg = SD_BUS_WIDTH_4;
110 break;
111 default:
112 return -EINVAL;
113 }
114
115 return mmc_wait_for_app_cmd(card->host, card, &cmd);
116 }
117
mmc_send_app_op_cond(struct mmc_host * host,u32 ocr,u32 * rocr)118 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
119 {
120 struct mmc_command cmd = {};
121 int i, err = 0;
122
123 cmd.opcode = SD_APP_OP_COND;
124 if (mmc_host_is_spi(host))
125 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
126 else
127 cmd.arg = ocr;
128 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
129
130 for (i = 100; i; i--) {
131 err = mmc_wait_for_app_cmd(host, NULL, &cmd);
132 if (err)
133 break;
134
135 /* if we're just probing, do a single pass */
136 if (ocr == 0)
137 break;
138
139 /* otherwise wait until reset completes */
140 if (mmc_host_is_spi(host)) {
141 if (!(cmd.resp[0] & R1_SPI_IDLE))
142 break;
143 } else {
144 if (cmd.resp[0] & MMC_CARD_BUSY)
145 break;
146 }
147
148 err = -ETIMEDOUT;
149
150 mmc_delay(10);
151 }
152
153 if (!i)
154 pr_err("%s: card never left busy state\n", mmc_hostname(host));
155
156 if (rocr && !mmc_host_is_spi(host))
157 *rocr = cmd.resp[0];
158
159 return err;
160 }
161
__mmc_send_if_cond(struct mmc_host * host,u32 ocr,u8 pcie_bits,u32 * resp)162 static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8 pcie_bits,
163 u32 *resp)
164 {
165 struct mmc_command cmd = {};
166 int err;
167 static const u8 test_pattern = 0xAA;
168 u8 result_pattern;
169
170 /*
171 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
172 * before SD_APP_OP_COND. This command will harmlessly fail for
173 * SD 1.0 cards.
174 */
175 cmd.opcode = SD_SEND_IF_COND;
176 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | pcie_bits << 8 | test_pattern;
177 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
178
179 err = mmc_wait_for_cmd(host, &cmd, 0);
180 if (err)
181 return err;
182
183 if (mmc_host_is_spi(host))
184 result_pattern = cmd.resp[1] & 0xFF;
185 else
186 result_pattern = cmd.resp[0] & 0xFF;
187
188 if (result_pattern != test_pattern)
189 return -EIO;
190
191 if (resp)
192 *resp = cmd.resp[0];
193
194 return 0;
195 }
196
mmc_send_if_cond(struct mmc_host * host,u32 ocr)197 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
198 {
199 return __mmc_send_if_cond(host, ocr, 0, NULL);
200 }
201
mmc_send_if_cond_pcie(struct mmc_host * host,u32 ocr)202 int mmc_send_if_cond_pcie(struct mmc_host *host, u32 ocr)
203 {
204 u32 resp = 0;
205 u8 pcie_bits = 0;
206 int ret;
207
208 if (host->caps2 & MMC_CAP2_SD_EXP) {
209 /* Probe card for SD express support via PCIe. */
210 pcie_bits = 0x10;
211 if (host->caps2 & MMC_CAP2_SD_EXP_1_2V)
212 /* Probe also for 1.2V support. */
213 pcie_bits = 0x30;
214 }
215
216 ret = __mmc_send_if_cond(host, ocr, pcie_bits, &resp);
217 if (ret)
218 return 0;
219
220 /* Continue with the SD express init, if the card supports it. */
221 resp &= 0x3000;
222 if (pcie_bits && resp) {
223 if (resp == 0x3000)
224 host->ios.timing = MMC_TIMING_SD_EXP_1_2V;
225 else
226 host->ios.timing = MMC_TIMING_SD_EXP;
227
228 /*
229 * According to the spec the clock shall also be gated, but
230 * let's leave this to the host driver for more flexibility.
231 */
232 return host->ops->init_sd_express(host, &host->ios);
233 }
234
235 return 0;
236 }
237
mmc_send_relative_addr(struct mmc_host * host,unsigned int * rca)238 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
239 {
240 int err;
241 struct mmc_command cmd = {};
242
243 cmd.opcode = SD_SEND_RELATIVE_ADDR;
244 cmd.arg = 0;
245 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
246
247 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
248 if (err)
249 return err;
250
251 *rca = cmd.resp[0] >> 16;
252
253 return 0;
254 }
255
mmc_app_send_scr(struct mmc_card * card)256 int mmc_app_send_scr(struct mmc_card *card)
257 {
258 int err;
259 struct mmc_request mrq = {};
260 struct mmc_command cmd = {};
261 struct mmc_data data = {};
262 struct scatterlist sg;
263 __be32 *scr;
264
265 /* NOTE: caller guarantees scr is heap-allocated */
266
267 err = mmc_app_cmd(card->host, card);
268 if (err)
269 return err;
270
271 /* dma onto stack is unsafe/nonportable, but callers to this
272 * routine normally provide temporary on-stack buffers ...
273 */
274 scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
275 if (!scr)
276 return -ENOMEM;
277
278 mrq.cmd = &cmd;
279 mrq.data = &data;
280
281 cmd.opcode = SD_APP_SEND_SCR;
282 cmd.arg = 0;
283 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
284
285 data.blksz = 8;
286 data.blocks = 1;
287 data.flags = MMC_DATA_READ;
288 data.sg = &sg;
289 data.sg_len = 1;
290
291 sg_init_one(&sg, scr, 8);
292
293 mmc_set_data_timeout(&data, card);
294
295 mmc_wait_for_req(card->host, &mrq);
296
297 card->raw_scr[0] = be32_to_cpu(scr[0]);
298 card->raw_scr[1] = be32_to_cpu(scr[1]);
299
300 kfree(scr);
301
302 if (cmd.error)
303 return cmd.error;
304 if (data.error)
305 return data.error;
306
307 return 0;
308 }
309
mmc_sd_switch(struct mmc_card * card,int mode,int group,u8 value,u8 * resp)310 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
311 u8 value, u8 *resp)
312 {
313 u32 cmd_args;
314
315 /* NOTE: caller guarantees resp is heap-allocated */
316
317 mode = !!mode;
318 value &= 0xF;
319 cmd_args = mode << 31 | 0x00FFFFFF;
320 cmd_args &= ~(0xF << (group * 4));
321 cmd_args |= value << (group * 4);
322
323 return mmc_send_adtc_data(card, card->host, SD_SWITCH, cmd_args, resp,
324 64);
325 }
326
mmc_app_sd_status(struct mmc_card * card,void * ssr)327 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
328 {
329 int err;
330 struct mmc_request mrq = {};
331 struct mmc_command cmd = {};
332 struct mmc_data data = {};
333 struct scatterlist sg;
334
335 /* NOTE: caller guarantees ssr is heap-allocated */
336
337 err = mmc_app_cmd(card->host, card);
338 if (err)
339 return err;
340
341 mrq.cmd = &cmd;
342 mrq.data = &data;
343
344 cmd.opcode = SD_APP_SD_STATUS;
345 cmd.arg = 0;
346 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
347
348 data.blksz = 64;
349 data.blocks = 1;
350 data.flags = MMC_DATA_READ;
351 data.sg = &sg;
352 data.sg_len = 1;
353
354 sg_init_one(&sg, ssr, 64);
355
356 mmc_set_data_timeout(&data, card);
357
358 mmc_wait_for_req(card->host, &mrq);
359
360 if (cmd.error)
361 return cmd.error;
362 if (data.error)
363 return data.error;
364
365 return 0;
366 }
367