2 * linux/drivers/mmc/core/sd_ops.h
4 * Copyright 2006-2007 Pierre Ossman
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.
12 #include <linux/slab.h>
13 #include <linux/types.h>
14 #include <linux/export.h>
15 #include <linux/scatterlist.h>
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/mmc.h>
20 #include <linux/mmc/sd.h>
25 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
28 struct mmc_command cmd = {0};
30 if (WARN_ON(card && card->host != host))
33 cmd.opcode = MMC_APP_CMD;
36 cmd.arg = card->rca << 16;
37 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
40 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
43 err = mmc_wait_for_cmd(host, &cmd, 0);
47 /* Check that card supported application commands */
48 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
53 EXPORT_SYMBOL_GPL(mmc_app_cmd);
56 * mmc_wait_for_app_cmd - start an application command and wait for
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
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
68 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
69 struct mmc_command *cmd, int retries)
71 struct mmc_request mrq = {NULL};
76 retries = MMC_CMD_RETRIES;
81 * We have to resend MMC_APP_CMD for each attempt so
82 * we cannot use the retries field in mmc_command.
84 for (i = 0;i <= retries;i++) {
85 err = mmc_app_cmd(host, card);
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)
95 memset(&mrq, 0, sizeof(struct mmc_request));
97 memset(cmd->resp, 0, sizeof(cmd->resp));
103 mmc_wait_for_req(host, &mrq);
109 /* no point in retrying illegal APP commands */
110 if (mmc_host_is_spi(host)) {
111 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
119 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
121 int mmc_app_set_bus_width(struct mmc_card *card, int width)
123 struct mmc_command cmd = {0};
125 cmd.opcode = SD_APP_SET_BUS_WIDTH;
126 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
129 case MMC_BUS_WIDTH_1:
130 cmd.arg = SD_BUS_WIDTH_1;
132 case MMC_BUS_WIDTH_4:
133 cmd.arg = SD_BUS_WIDTH_4;
139 return mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
142 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
144 struct mmc_command cmd = {0};
147 cmd.opcode = SD_APP_OP_COND;
148 if (mmc_host_is_spi(host))
149 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
152 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
154 for (i = 100; i; i--) {
155 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
159 /* if we're just probing, do a single pass */
163 /* otherwise wait until reset completes */
164 if (mmc_host_is_spi(host)) {
165 if (!(cmd.resp[0] & R1_SPI_IDLE))
168 if (cmd.resp[0] & MMC_CARD_BUSY)
178 pr_err("%s: card never left busy state\n", mmc_hostname(host));
180 if (rocr && !mmc_host_is_spi(host))
186 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
188 struct mmc_command cmd = {0};
190 static const u8 test_pattern = 0xAA;
194 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
195 * before SD_APP_OP_COND. This command will harmlessly fail for
198 cmd.opcode = SD_SEND_IF_COND;
199 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
200 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
202 err = mmc_wait_for_cmd(host, &cmd, 0);
206 if (mmc_host_is_spi(host))
207 result_pattern = cmd.resp[1] & 0xFF;
209 result_pattern = cmd.resp[0] & 0xFF;
211 if (result_pattern != test_pattern)
217 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
220 struct mmc_command cmd = {0};
222 cmd.opcode = SD_SEND_RELATIVE_ADDR;
224 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
226 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
230 *rca = cmd.resp[0] >> 16;
235 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
238 struct mmc_request mrq = {NULL};
239 struct mmc_command cmd = {0};
240 struct mmc_data data = {0};
241 struct scatterlist sg;
244 /* NOTE: caller guarantees scr is heap-allocated */
246 err = mmc_app_cmd(card->host, card);
250 /* dma onto stack is unsafe/nonportable, but callers to this
251 * routine normally provide temporary on-stack buffers ...
253 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
254 if (data_buf == NULL)
260 cmd.opcode = SD_APP_SEND_SCR;
262 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
266 data.flags = MMC_DATA_READ;
270 sg_init_one(&sg, data_buf, 8);
272 mmc_set_data_timeout(&data, card);
274 mmc_wait_for_req(card->host, &mrq);
276 memcpy(scr, data_buf, sizeof(card->raw_scr));
284 scr[0] = be32_to_cpu(scr[0]);
285 scr[1] = be32_to_cpu(scr[1]);
290 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
293 struct mmc_request mrq = {NULL};
294 struct mmc_command cmd = {0};
295 struct mmc_data data = {0};
296 struct scatterlist sg;
298 /* NOTE: caller guarantees resp is heap-allocated */
306 cmd.opcode = SD_SWITCH;
307 cmd.arg = mode << 31 | 0x00FFFFFF;
308 cmd.arg &= ~(0xF << (group * 4));
309 cmd.arg |= value << (group * 4);
310 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
314 data.flags = MMC_DATA_READ;
318 sg_init_one(&sg, resp, 64);
320 mmc_set_data_timeout(&data, card);
322 mmc_wait_for_req(card->host, &mrq);
332 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
335 struct mmc_request mrq = {NULL};
336 struct mmc_command cmd = {0};
337 struct mmc_data data = {0};
338 struct scatterlist sg;
340 /* NOTE: caller guarantees ssr is heap-allocated */
342 err = mmc_app_cmd(card->host, card);
349 cmd.opcode = SD_APP_SD_STATUS;
351 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
355 data.flags = MMC_DATA_READ;
359 sg_init_one(&sg, ssr, 64);
361 mmc_set_data_timeout(&data, card);
363 mmc_wait_for_req(card->host, &mrq);