1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * linux/drivers/mmc/core/sd_ops.h
5 * Copyright 2006-2007 Pierre Ossman
8 #include <linux/slab.h>
9 #include <linux/types.h>
10 #include <linux/export.h>
11 #include <linux/scatterlist.h>
13 #include <linux/mmc/host.h>
14 #include <linux/mmc/card.h>
15 #include <linux/mmc/mmc.h>
16 #include <linux/mmc/sd.h>
22 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
25 struct mmc_command cmd = {};
27 if (WARN_ON(card && card->host != host))
30 cmd.opcode = MMC_APP_CMD;
33 cmd.arg = card->rca << 16;
34 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
37 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
40 err = mmc_wait_for_cmd(host, &cmd, 0);
44 /* Check that card supported application commands */
45 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
50 EXPORT_SYMBOL_GPL(mmc_app_cmd);
52 static int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
53 struct mmc_command *cmd)
55 struct mmc_request mrq = {};
59 * We have to resend MMC_APP_CMD for each attempt so
60 * we cannot use the retries field in mmc_command.
62 for (i = 0; i <= MMC_CMD_RETRIES; i++) {
63 err = mmc_app_cmd(host, card);
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)
73 memset(&mrq, 0, sizeof(struct mmc_request));
75 memset(cmd->resp, 0, sizeof(cmd->resp));
81 mmc_wait_for_req(host, &mrq);
87 /* no point in retrying illegal APP commands */
88 if (mmc_host_is_spi(host)) {
89 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
97 int mmc_app_set_bus_width(struct mmc_card *card, int width)
99 struct mmc_command cmd = {};
101 cmd.opcode = SD_APP_SET_BUS_WIDTH;
102 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
105 case MMC_BUS_WIDTH_1:
106 cmd.arg = SD_BUS_WIDTH_1;
108 case MMC_BUS_WIDTH_4:
109 cmd.arg = SD_BUS_WIDTH_4;
115 return mmc_wait_for_app_cmd(card->host, card, &cmd);
118 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
120 struct mmc_command cmd = {};
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 */
128 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
130 for (i = 100; i; i--) {
131 err = mmc_wait_for_app_cmd(host, NULL, &cmd);
135 /* if we're just probing, do a single pass */
139 /* otherwise wait until reset completes */
140 if (mmc_host_is_spi(host)) {
141 if (!(cmd.resp[0] & R1_SPI_IDLE))
144 if (cmd.resp[0] & MMC_CARD_BUSY)
154 pr_err("%s: card never left busy state\n", mmc_hostname(host));
156 if (rocr && !mmc_host_is_spi(host))
162 static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8 pcie_bits,
165 struct mmc_command cmd = {};
167 static const u8 test_pattern = 0xAA;
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
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;
179 err = mmc_wait_for_cmd(host, &cmd, 0);
183 if (mmc_host_is_spi(host))
184 result_pattern = cmd.resp[1] & 0xFF;
186 result_pattern = cmd.resp[0] & 0xFF;
188 if (result_pattern != test_pattern)
197 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
199 return __mmc_send_if_cond(host, ocr, 0, NULL);
202 int mmc_send_if_cond_pcie(struct mmc_host *host, u32 ocr)
208 if (host->caps2 & MMC_CAP2_SD_EXP) {
209 /* Probe card for SD express support via PCIe. */
211 if (host->caps2 & MMC_CAP2_SD_EXP_1_2V)
212 /* Probe also for 1.2V support. */
216 ret = __mmc_send_if_cond(host, ocr, pcie_bits, &resp);
220 /* Continue with the SD express init, if the card supports it. */
222 if (pcie_bits && resp) {
224 host->ios.timing = MMC_TIMING_SD_EXP_1_2V;
226 host->ios.timing = MMC_TIMING_SD_EXP;
229 * According to the spec the clock shall also be gated, but
230 * let's leave this to the host driver for more flexibility.
232 return host->ops->init_sd_express(host, &host->ios);
238 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
241 struct mmc_command cmd = {};
243 cmd.opcode = SD_SEND_RELATIVE_ADDR;
245 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
247 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
251 *rca = cmd.resp[0] >> 16;
256 int mmc_app_send_scr(struct mmc_card *card)
259 struct mmc_request mrq = {};
260 struct mmc_command cmd = {};
261 struct mmc_data data = {};
262 struct scatterlist sg;
265 /* NOTE: caller guarantees scr is heap-allocated */
267 err = mmc_app_cmd(card->host, card);
271 /* dma onto stack is unsafe/nonportable, but callers to this
272 * routine normally provide temporary on-stack buffers ...
274 scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
281 cmd.opcode = SD_APP_SEND_SCR;
283 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
287 data.flags = MMC_DATA_READ;
291 sg_init_one(&sg, scr, 8);
293 mmc_set_data_timeout(&data, card);
295 mmc_wait_for_req(card->host, &mrq);
297 card->raw_scr[0] = be32_to_cpu(scr[0]);
298 card->raw_scr[1] = be32_to_cpu(scr[1]);
310 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
315 /* NOTE: caller guarantees resp is heap-allocated */
319 cmd_args = mode << 31 | 0x00FFFFFF;
320 cmd_args &= ~(0xF << (group * 4));
321 cmd_args |= value << (group * 4);
323 return mmc_send_adtc_data(card, card->host, SD_SWITCH, cmd_args, resp,
327 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
330 struct mmc_request mrq = {};
331 struct mmc_command cmd = {};
332 struct mmc_data data = {};
333 struct scatterlist sg;
335 /* NOTE: caller guarantees ssr is heap-allocated */
337 err = mmc_app_cmd(card->host, card);
344 cmd.opcode = SD_APP_SD_STATUS;
346 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
350 data.flags = MMC_DATA_READ;
354 sg_init_one(&sg, ssr, 64);
356 mmc_set_data_timeout(&data, card);
358 mmc_wait_for_req(card->host, &mrq);