sd_ops.c 6.6 KB

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  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. #include <linux/slab.h>
  8. #include <linux/types.h>
  9. #include <linux/export.h>
  10. #include <linux/scatterlist.h>
  11. #include <linux/mmc/host.h>
  12. #include <linux/mmc/card.h>
  13. #include <linux/mmc/mmc.h>
  14. #include <linux/mmc/sd.h>
  15. #include "core.h"
  16. #include "sd_ops.h"
  17. int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
  18. {
  19. int err;
  20. struct mmc_command cmd = {};
  21. if (WARN_ON(card && card->host != host))
  22. return -EINVAL;
  23. cmd.opcode = MMC_APP_CMD;
  24. if (card) {
  25. cmd.arg = card->rca << 16;
  26. cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
  27. } else {
  28. cmd.arg = 0;
  29. cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
  30. }
  31. err = mmc_wait_for_cmd(host, &cmd, 0);
  32. if (err)
  33. return err;
  34. /* Check that card supported application commands */
  35. if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
  36. return -EOPNOTSUPP;
  37. return 0;
  38. }
  39. EXPORT_SYMBOL_GPL(mmc_app_cmd);
  40. static int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
  41. struct mmc_command *cmd)
  42. {
  43. struct mmc_request mrq = {};
  44. int i, err = -EIO;
  45. /*
  46. * We have to resend MMC_APP_CMD for each attempt so
  47. * we cannot use the retries field in mmc_command.
  48. */
  49. for (i = 0; i <= MMC_CMD_RETRIES; i++) {
  50. err = mmc_app_cmd(host, card);
  51. if (err) {
  52. /* no point in retrying; no APP commands allowed */
  53. if (mmc_host_is_spi(host)) {
  54. if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
  55. break;
  56. }
  57. continue;
  58. }
  59. memset(&mrq, 0, sizeof(struct mmc_request));
  60. memset(cmd->resp, 0, sizeof(cmd->resp));
  61. cmd->retries = 0;
  62. mrq.cmd = cmd;
  63. cmd->data = NULL;
  64. mmc_wait_for_req(host, &mrq);
  65. err = cmd->error;
  66. if (!cmd->error)
  67. break;
  68. /* no point in retrying illegal APP commands */
  69. if (mmc_host_is_spi(host)) {
  70. if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
  71. break;
  72. }
  73. }
  74. return err;
  75. }
  76. int mmc_app_set_bus_width(struct mmc_card *card, int width)
  77. {
  78. struct mmc_command cmd = {};
  79. cmd.opcode = SD_APP_SET_BUS_WIDTH;
  80. cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
  81. switch (width) {
  82. case MMC_BUS_WIDTH_1:
  83. cmd.arg = SD_BUS_WIDTH_1;
  84. break;
  85. case MMC_BUS_WIDTH_4:
  86. cmd.arg = SD_BUS_WIDTH_4;
  87. break;
  88. default:
  89. return -EINVAL;
  90. }
  91. return mmc_wait_for_app_cmd(card->host, card, &cmd);
  92. }
  93. int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
  94. {
  95. struct mmc_command cmd = {};
  96. int i, err = 0;
  97. cmd.opcode = SD_APP_OP_COND;
  98. if (mmc_host_is_spi(host))
  99. cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
  100. else
  101. cmd.arg = ocr;
  102. cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
  103. for (i = 100; i; i--) {
  104. err = mmc_wait_for_app_cmd(host, NULL, &cmd);
  105. if (err)
  106. break;
  107. /* if we're just probing, do a single pass */
  108. if (ocr == 0)
  109. break;
  110. /* otherwise wait until reset completes */
  111. if (mmc_host_is_spi(host)) {
  112. if (!(cmd.resp[0] & R1_SPI_IDLE))
  113. break;
  114. } else {
  115. if (cmd.resp[0] & MMC_CARD_BUSY)
  116. break;
  117. }
  118. err = -ETIMEDOUT;
  119. mmc_delay(10);
  120. }
  121. if (!i)
  122. pr_err("%s: card never left busy state\n", mmc_hostname(host));
  123. if (rocr && !mmc_host_is_spi(host))
  124. *rocr = cmd.resp[0];
  125. return err;
  126. }
  127. int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
  128. {
  129. struct mmc_command cmd = {};
  130. int err;
  131. static const u8 test_pattern = 0xAA;
  132. u8 result_pattern;
  133. /*
  134. * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
  135. * before SD_APP_OP_COND. This command will harmlessly fail for
  136. * SD 1.0 cards.
  137. */
  138. cmd.opcode = SD_SEND_IF_COND;
  139. cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
  140. cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
  141. err = mmc_wait_for_cmd(host, &cmd, 0);
  142. if (err)
  143. return err;
  144. if (mmc_host_is_spi(host))
  145. result_pattern = cmd.resp[1] & 0xFF;
  146. else
  147. result_pattern = cmd.resp[0] & 0xFF;
  148. if (result_pattern != test_pattern)
  149. return -EIO;
  150. return 0;
  151. }
  152. int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
  153. {
  154. int err;
  155. struct mmc_command cmd = {};
  156. cmd.opcode = SD_SEND_RELATIVE_ADDR;
  157. cmd.arg = 0;
  158. cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
  159. err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
  160. if (err)
  161. return err;
  162. *rca = cmd.resp[0] >> 16;
  163. return 0;
  164. }
  165. int mmc_app_send_scr(struct mmc_card *card)
  166. {
  167. int err;
  168. struct mmc_request mrq = {};
  169. struct mmc_command cmd = {};
  170. struct mmc_data data = {};
  171. struct scatterlist sg;
  172. __be32 *scr;
  173. /* NOTE: caller guarantees scr is heap-allocated */
  174. err = mmc_app_cmd(card->host, card);
  175. if (err)
  176. return err;
  177. /* dma onto stack is unsafe/nonportable, but callers to this
  178. * routine normally provide temporary on-stack buffers ...
  179. */
  180. scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
  181. if (!scr)
  182. return -ENOMEM;
  183. mrq.cmd = &cmd;
  184. mrq.data = &data;
  185. cmd.opcode = SD_APP_SEND_SCR;
  186. cmd.arg = 0;
  187. cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
  188. data.blksz = 8;
  189. data.blocks = 1;
  190. data.flags = MMC_DATA_READ;
  191. data.sg = &sg;
  192. data.sg_len = 1;
  193. sg_init_one(&sg, scr, 8);
  194. mmc_set_data_timeout(&data, card);
  195. mmc_wait_for_req(card->host, &mrq);
  196. card->raw_scr[0] = be32_to_cpu(scr[0]);
  197. card->raw_scr[1] = be32_to_cpu(scr[1]);
  198. kfree(scr);
  199. if (cmd.error)
  200. return cmd.error;
  201. if (data.error)
  202. return data.error;
  203. return 0;
  204. }
  205. int mmc_sd_switch(struct mmc_card *card, int mode, int group,
  206. u8 value, u8 *resp)
  207. {
  208. struct mmc_request mrq = {};
  209. struct mmc_command cmd = {};
  210. struct mmc_data data = {};
  211. struct scatterlist sg;
  212. /* NOTE: caller guarantees resp is heap-allocated */
  213. mode = !!mode;
  214. value &= 0xF;
  215. mrq.cmd = &cmd;
  216. mrq.data = &data;
  217. cmd.opcode = SD_SWITCH;
  218. cmd.arg = mode << 31 | 0x00FFFFFF;
  219. cmd.arg &= ~(0xF << (group * 4));
  220. cmd.arg |= value << (group * 4);
  221. cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
  222. data.blksz = 64;
  223. data.blocks = 1;
  224. data.flags = MMC_DATA_READ;
  225. data.sg = &sg;
  226. data.sg_len = 1;
  227. sg_init_one(&sg, resp, 64);
  228. mmc_set_data_timeout(&data, card);
  229. mmc_wait_for_req(card->host, &mrq);
  230. if (cmd.error)
  231. return cmd.error;
  232. if (data.error)
  233. return data.error;
  234. return 0;
  235. }
  236. int mmc_app_sd_status(struct mmc_card *card, void *ssr)
  237. {
  238. int err;
  239. struct mmc_request mrq = {};
  240. struct mmc_command cmd = {};
  241. struct mmc_data data = {};
  242. struct scatterlist sg;
  243. /* NOTE: caller guarantees ssr is heap-allocated */
  244. err = mmc_app_cmd(card->host, card);
  245. if (err)
  246. return err;
  247. mrq.cmd = &cmd;
  248. mrq.data = &data;
  249. cmd.opcode = SD_APP_SD_STATUS;
  250. cmd.arg = 0;
  251. cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
  252. data.blksz = 64;
  253. data.blocks = 1;
  254. data.flags = MMC_DATA_READ;
  255. data.sg = &sg;
  256. data.sg_len = 1;
  257. sg_init_one(&sg, ssr, 64);
  258. mmc_set_data_timeout(&data, card);
  259. mmc_wait_for_req(card->host, &mrq);
  260. if (cmd.error)
  261. return cmd.error;
  262. if (data.error)
  263. return data.error;
  264. return 0;
  265. }