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>
21 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
24 struct mmc_command cmd = {};
26 if (WARN_ON(card && card->host != host))
29 cmd.opcode = MMC_APP_CMD;
32 cmd.arg = card->rca << 16;
33 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
36 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
39 err = mmc_wait_for_cmd(host, &cmd, 0);
43 /* Check that card supported application commands */
44 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
49 EXPORT_SYMBOL_GPL(mmc_app_cmd);
51 static int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
52 struct mmc_command *cmd)
54 struct mmc_request mrq = {};
58 * We have to resend MMC_APP_CMD for each attempt so
59 * we cannot use the retries field in mmc_command.
61 for (i = 0; i <= MMC_CMD_RETRIES; i++) {
62 err = mmc_app_cmd(host, card);
64 /* no point in retrying; no APP commands allowed */
65 if (mmc_host_is_spi(host)) {
66 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
72 memset(&mrq, 0, sizeof(struct mmc_request));
74 memset(cmd->resp, 0, sizeof(cmd->resp));
80 mmc_wait_for_req(host, &mrq);
86 /* no point in retrying illegal APP commands */
87 if (mmc_host_is_spi(host)) {
88 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
96 int mmc_app_set_bus_width(struct mmc_card *card, int width)
98 struct mmc_command cmd = {};
100 cmd.opcode = SD_APP_SET_BUS_WIDTH;
101 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
104 case MMC_BUS_WIDTH_1:
105 cmd.arg = SD_BUS_WIDTH_1;
107 case MMC_BUS_WIDTH_4:
108 cmd.arg = SD_BUS_WIDTH_4;
114 return mmc_wait_for_app_cmd(card->host, card, &cmd);
117 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
119 struct mmc_command cmd = {};
122 cmd.opcode = SD_APP_OP_COND;
123 if (mmc_host_is_spi(host))
124 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
127 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
129 for (i = 100; i; i--) {
130 err = mmc_wait_for_app_cmd(host, NULL, &cmd);
134 /* if we're just probing, do a single pass */
138 /* otherwise wait until reset completes */
139 if (mmc_host_is_spi(host)) {
140 if (!(cmd.resp[0] & R1_SPI_IDLE))
143 if (cmd.resp[0] & MMC_CARD_BUSY)
153 pr_err("%s: card never left busy state\n", mmc_hostname(host));
155 if (rocr && !mmc_host_is_spi(host))
161 static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8 pcie_bits,
164 struct mmc_command cmd = {};
166 static const u8 test_pattern = 0xAA;
170 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
171 * before SD_APP_OP_COND. This command will harmlessly fail for
174 cmd.opcode = SD_SEND_IF_COND;
175 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | pcie_bits << 8 | test_pattern;
176 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
178 err = mmc_wait_for_cmd(host, &cmd, 0);
182 if (mmc_host_is_spi(host))
183 result_pattern = cmd.resp[1] & 0xFF;
185 result_pattern = cmd.resp[0] & 0xFF;
187 if (result_pattern != test_pattern)
196 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
198 return __mmc_send_if_cond(host, ocr, 0, NULL);
201 int mmc_send_if_cond_pcie(struct mmc_host *host, u32 ocr)
207 if (host->caps2 & MMC_CAP2_SD_EXP) {
208 /* Probe card for SD express support via PCIe. */
210 if (host->caps2 & MMC_CAP2_SD_EXP_1_2V)
211 /* Probe also for 1.2V support. */
215 ret = __mmc_send_if_cond(host, ocr, pcie_bits, &resp);
219 /* Continue with the SD express init, if the card supports it. */
221 if (pcie_bits && resp) {
223 host->ios.timing = MMC_TIMING_SD_EXP_1_2V;
225 host->ios.timing = MMC_TIMING_SD_EXP;
228 * According to the spec the clock shall also be gated, but
229 * let's leave this to the host driver for more flexibility.
231 return host->ops->init_sd_express(host, &host->ios);
237 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
240 struct mmc_command cmd = {};
242 cmd.opcode = SD_SEND_RELATIVE_ADDR;
244 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
246 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
250 *rca = cmd.resp[0] >> 16;
255 int mmc_app_send_scr(struct mmc_card *card)
258 struct mmc_request mrq = {};
259 struct mmc_command cmd = {};
260 struct mmc_data data = {};
261 struct scatterlist sg;
264 /* NOTE: caller guarantees scr is heap-allocated */
266 err = mmc_app_cmd(card->host, card);
270 /* dma onto stack is unsafe/nonportable, but callers to this
271 * routine normally provide temporary on-stack buffers ...
273 scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
280 cmd.opcode = SD_APP_SEND_SCR;
282 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
286 data.flags = MMC_DATA_READ;
290 sg_init_one(&sg, scr, 8);
292 mmc_set_data_timeout(&data, card);
294 mmc_wait_for_req(card->host, &mrq);
296 card->raw_scr[0] = be32_to_cpu(scr[0]);
297 card->raw_scr[1] = be32_to_cpu(scr[1]);
309 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
312 struct mmc_request mrq = {};
313 struct mmc_command cmd = {};
314 struct mmc_data data = {};
315 struct scatterlist sg;
317 /* NOTE: caller guarantees resp is heap-allocated */
325 cmd.opcode = SD_SWITCH;
326 cmd.arg = mode << 31 | 0x00FFFFFF;
327 cmd.arg &= ~(0xF << (group * 4));
328 cmd.arg |= value << (group * 4);
329 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
333 data.flags = MMC_DATA_READ;
337 sg_init_one(&sg, resp, 64);
339 mmc_set_data_timeout(&data, card);
341 mmc_wait_for_req(card->host, &mrq);
351 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
354 struct mmc_request mrq = {};
355 struct mmc_command cmd = {};
356 struct mmc_data data = {};
357 struct scatterlist sg;
359 /* NOTE: caller guarantees ssr is heap-allocated */
361 err = mmc_app_cmd(card->host, card);
368 cmd.opcode = SD_APP_SD_STATUS;
370 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
374 data.flags = MMC_DATA_READ;
378 sg_init_one(&sg, ssr, 64);
380 mmc_set_data_timeout(&data, card);
382 mmc_wait_for_req(card->host, &mrq);