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/scatterlist.h>
16 #include <linux/mmc/host.h>
17 #include <linux/mmc/card.h>
18 #include <linux/mmc/mmc.h>
19 #include <linux/mmc/sd.h>
24 static int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
27 struct mmc_command cmd = {0};
30 BUG_ON(card && (card->host != host));
32 cmd.opcode = MMC_APP_CMD;
35 cmd.arg = card->rca << 16;
36 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
39 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
42 err = mmc_wait_for_cmd(host, &cmd, 0);
46 /* Check that card supported application commands */
47 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
54 * mmc_wait_for_app_cmd - start an application command and wait for
56 * @host: MMC host to start command
57 * @card: Card to send MMC_APP_CMD to
58 * @cmd: MMC command to start
59 * @retries: maximum number of retries
61 * Sends a MMC_APP_CMD, checks the card response, sends the command
62 * in the parameter and waits for it to complete. Return any error
63 * that occurred while the command was executing. Do not attempt to
66 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
67 struct mmc_command *cmd, int retries)
69 struct mmc_request mrq;
79 * We have to resend MMC_APP_CMD for each attempt so
80 * we cannot use the retries field in mmc_command.
82 for (i = 0;i <= retries;i++) {
83 err = mmc_app_cmd(host, card);
85 /* no point in retrying; no APP commands allowed */
86 if (mmc_host_is_spi(host)) {
87 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
93 memset(&mrq, 0, sizeof(struct mmc_request));
95 memset(cmd->resp, 0, sizeof(cmd->resp));
101 mmc_wait_for_req(host, &mrq);
107 /* no point in retrying illegal APP commands */
108 if (mmc_host_is_spi(host)) {
109 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
117 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
119 int mmc_app_set_bus_width(struct mmc_card *card, int width)
122 struct mmc_command cmd = {0};
127 cmd.opcode = SD_APP_SET_BUS_WIDTH;
128 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
131 case MMC_BUS_WIDTH_1:
132 cmd.arg = SD_BUS_WIDTH_1;
134 case MMC_BUS_WIDTH_4:
135 cmd.arg = SD_BUS_WIDTH_4;
141 err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
148 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
150 struct mmc_command cmd = {0};
155 cmd.opcode = SD_APP_OP_COND;
156 if (mmc_host_is_spi(host))
157 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
160 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
162 for (i = 100; i; i--) {
163 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
167 /* if we're just probing, do a single pass */
171 /* otherwise wait until reset completes */
172 if (mmc_host_is_spi(host)) {
173 if (!(cmd.resp[0] & R1_SPI_IDLE))
176 if (cmd.resp[0] & MMC_CARD_BUSY)
185 if (rocr && !mmc_host_is_spi(host))
191 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
193 struct mmc_command cmd = {0};
195 static const u8 test_pattern = 0xAA;
199 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
200 * before SD_APP_OP_COND. This command will harmlessly fail for
203 cmd.opcode = SD_SEND_IF_COND;
204 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
205 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
207 err = mmc_wait_for_cmd(host, &cmd, 0);
211 if (mmc_host_is_spi(host))
212 result_pattern = cmd.resp[1] & 0xFF;
214 result_pattern = cmd.resp[0] & 0xFF;
216 if (result_pattern != test_pattern)
222 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
225 struct mmc_command cmd = {0};
230 cmd.opcode = SD_SEND_RELATIVE_ADDR;
232 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
234 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
238 *rca = cmd.resp[0] >> 16;
243 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
246 struct mmc_request mrq;
247 struct mmc_command cmd = {0};
248 struct mmc_data data;
249 struct scatterlist sg;
256 /* NOTE: caller guarantees scr is heap-allocated */
258 err = mmc_app_cmd(card->host, card);
262 /* dma onto stack is unsafe/nonportable, but callers to this
263 * routine normally provide temporary on-stack buffers ...
265 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
266 if (data_buf == NULL)
269 memset(&mrq, 0, sizeof(struct mmc_request));
270 memset(&data, 0, sizeof(struct mmc_data));
275 cmd.opcode = SD_APP_SEND_SCR;
277 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
281 data.flags = MMC_DATA_READ;
285 sg_init_one(&sg, data_buf, 8);
287 mmc_set_data_timeout(&data, card);
289 mmc_wait_for_req(card->host, &mrq);
291 memcpy(scr, data_buf, sizeof(card->raw_scr));
299 scr[0] = be32_to_cpu(scr[0]);
300 scr[1] = be32_to_cpu(scr[1]);
305 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
308 struct mmc_request mrq;
309 struct mmc_command cmd = {0};
310 struct mmc_data data;
311 struct scatterlist sg;
316 /* NOTE: caller guarantees resp is heap-allocated */
321 memset(&mrq, 0, sizeof(struct mmc_request));
322 memset(&data, 0, sizeof(struct mmc_data));
327 cmd.opcode = SD_SWITCH;
328 cmd.arg = mode << 31 | 0x00FFFFFF;
329 cmd.arg &= ~(0xF << (group * 4));
330 cmd.arg |= value << (group * 4);
331 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
335 data.flags = MMC_DATA_READ;
339 sg_init_one(&sg, resp, 64);
341 mmc_set_data_timeout(&data, card);
343 mmc_wait_for_req(card->host, &mrq);
353 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
356 struct mmc_request mrq;
357 struct mmc_command cmd = {0};
358 struct mmc_data data;
359 struct scatterlist sg;
365 /* NOTE: caller guarantees ssr is heap-allocated */
367 err = mmc_app_cmd(card->host, card);
371 memset(&mrq, 0, sizeof(struct mmc_request));
372 memset(&data, 0, sizeof(struct mmc_data));
377 cmd.opcode = SD_APP_SD_STATUS;
379 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
383 data.flags = MMC_DATA_READ;
387 sg_init_one(&sg, ssr, 64);
389 mmc_set_data_timeout(&data, card);
391 mmc_wait_for_req(card->host, &mrq);