drivers/mmc/core/sd

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This source file includes following definitions.
mmc_app_cmd
mmc_wait_for_app_cmd
mmc_app_set_bus_width
mmc_send_app_op_cond
mmc_send_if_cond
mmc_send_relative_addr
mmc_app_send_scr
mmc_sd_switch
mmc_app_sd_status
   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 
   8 #include <linux/slab.h>
   9 #include <linux/types.h>
  10 #include <linux/export.h>
  11 #include <linux/scatterlist.h>
  12 
  13 #include <linux/mmc/host.h>
  14 #include <linux/mmc/card.h>
  15 #include <linux/mmc/mmc.h>
  16 #include <linux/mmc/sd.h>
  17 
  18 #include "core.h"
  19 #include "sd_ops.h"
  20 
  21 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
  22 {
  23         int err;
  24         struct mmc_command cmd = {};
  25 
  26         if (WARN_ON(card && card->host != host))
  27                 return -EINVAL;
  28 
  29         cmd.opcode = MMC_APP_CMD;
  30 
  31         if (card) {
  32                 cmd.arg = card->rca << 16;
  33                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
  34         } else {
  35                 cmd.arg = 0;
  36                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
  37         }
  38 
  39         err = mmc_wait_for_cmd(host, &cmd, 0);
  40         if (err)
  41                 return err;
  42 
  43         /* Check that card supported application commands */
  44         if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
  45                 return -EOPNOTSUPP;
  46 
  47         return 0;
  48 }
  49 EXPORT_SYMBOL_GPL(mmc_app_cmd);
  50 
  51 static int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
  52                                 struct mmc_command *cmd)
  53 {
  54         struct mmc_request mrq = {};
  55         int i, err = -EIO;
  56 
  57         /*
  58          * We have to resend MMC_APP_CMD for each attempt so
  59          * we cannot use the retries field in mmc_command.
  60          */
  61         for (i = 0; i <= MMC_CMD_RETRIES; i++) {
  62                 err = mmc_app_cmd(host, card);
  63                 if (err) {
  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)
  67                                         break;
  68                         }
  69                         continue;
  70                 }
  71 
  72                 memset(&mrq, 0, sizeof(struct mmc_request));
  73 
  74                 memset(cmd->resp, 0, sizeof(cmd->resp));
  75                 cmd->retries = 0;
  76 
  77                 mrq.cmd = cmd;
  78                 cmd->data = NULL;
  79 
  80                 mmc_wait_for_req(host, &mrq);
  81 
  82                 err = cmd->error;
  83                 if (!cmd->error)
  84                         break;
  85 
  86                 /* no point in retrying illegal APP commands */
  87                 if (mmc_host_is_spi(host)) {
  88                         if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
  89                                 break;
  90                 }
  91         }
  92 
  93         return err;
  94 }
  95 
  96 int mmc_app_set_bus_width(struct mmc_card *card, int width)
  97 {
  98         struct mmc_command cmd = {};
  99 
 100         cmd.opcode = SD_APP_SET_BUS_WIDTH;
 101         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 102 
 103         switch (width) {
 104         case MMC_BUS_WIDTH_1:
 105                 cmd.arg = SD_BUS_WIDTH_1;
 106                 break;
 107         case MMC_BUS_WIDTH_4:
 108                 cmd.arg = SD_BUS_WIDTH_4;
 109                 break;
 110         default:
 111                 return -EINVAL;
 112         }
 113 
 114         return mmc_wait_for_app_cmd(card->host, card, &cmd);
 115 }
 116 
 117 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 118 {
 119         struct mmc_command cmd = {};
 120         int i, err = 0;
 121 
 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 */
 125         else
 126                 cmd.arg = ocr;
 127         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 128 
 129         for (i = 100; i; i--) {
 130                 err = mmc_wait_for_app_cmd(host, NULL, &cmd);
 131                 if (err)
 132                         break;
 133 
 134                 /* if we're just probing, do a single pass */
 135                 if (ocr == 0)
 136                         break;
 137 
 138                 /* otherwise wait until reset completes */
 139                 if (mmc_host_is_spi(host)) {
 140                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 141                                 break;
 142                 } else {
 143                         if (cmd.resp[0] & MMC_CARD_BUSY)
 144                                 break;
 145                 }
 146 
 147                 err = -ETIMEDOUT;
 148 
 149                 mmc_delay(10);
 150         }
 151 
 152         if (!i)
 153                 pr_err("%s: card never left busy state\n", mmc_hostname(host));
 154 
 155         if (rocr && !mmc_host_is_spi(host))
 156                 *rocr = cmd.resp[0];
 157 
 158         return err;
 159 }
 160 
 161 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 162 {
 163         struct mmc_command cmd = {};
 164         int err;
 165         static const u8 test_pattern = 0xAA;
 166         u8 result_pattern;
 167 
 168         /*
 169          * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
 170          * before SD_APP_OP_COND. This command will harmlessly fail for
 171          * SD 1.0 cards.
 172          */
 173         cmd.opcode = SD_SEND_IF_COND;
 174         cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
 175         cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
 176 
 177         err = mmc_wait_for_cmd(host, &cmd, 0);
 178         if (err)
 179                 return err;
 180 
 181         if (mmc_host_is_spi(host))
 182                 result_pattern = cmd.resp[1] & 0xFF;
 183         else
 184                 result_pattern = cmd.resp[0] & 0xFF;
 185 
 186         if (result_pattern != test_pattern)
 187                 return -EIO;
 188 
 189         return 0;
 190 }
 191 
 192 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 193 {
 194         int err;
 195         struct mmc_command cmd = {};
 196 
 197         cmd.opcode = SD_SEND_RELATIVE_ADDR;
 198         cmd.arg = 0;
 199         cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 200 
 201         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 202         if (err)
 203                 return err;
 204 
 205         *rca = cmd.resp[0] >> 16;
 206 
 207         return 0;
 208 }
 209 
 210 int mmc_app_send_scr(struct mmc_card *card)
 211 {
 212         int err;
 213         struct mmc_request mrq = {};
 214         struct mmc_command cmd = {};
 215         struct mmc_data data = {};
 216         struct scatterlist sg;
 217         __be32 *scr;
 218 
 219         /* NOTE: caller guarantees scr is heap-allocated */
 220 
 221         err = mmc_app_cmd(card->host, card);
 222         if (err)
 223                 return err;
 224 
 225         /* dma onto stack is unsafe/nonportable, but callers to this
 226          * routine normally provide temporary on-stack buffers ...
 227          */
 228         scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
 229         if (!scr)
 230                 return -ENOMEM;
 231 
 232         mrq.cmd = &cmd;
 233         mrq.data = &data;
 234 
 235         cmd.opcode = SD_APP_SEND_SCR;
 236         cmd.arg = 0;
 237         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 238 
 239         data.blksz = 8;
 240         data.blocks = 1;
 241         data.flags = MMC_DATA_READ;
 242         data.sg = &sg;
 243         data.sg_len = 1;
 244 
 245         sg_init_one(&sg, scr, 8);
 246 
 247         mmc_set_data_timeout(&data, card);
 248 
 249         mmc_wait_for_req(card->host, &mrq);
 250 
 251         card->raw_scr[0] = be32_to_cpu(scr[0]);
 252         card->raw_scr[1] = be32_to_cpu(scr[1]);
 253 
 254         kfree(scr);
 255 
 256         if (cmd.error)
 257                 return cmd.error;
 258         if (data.error)
 259                 return data.error;
 260 
 261         return 0;
 262 }
 263 
 264 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 265         u8 value, u8 *resp)
 266 {
 267         struct mmc_request mrq = {};
 268         struct mmc_command cmd = {};
 269         struct mmc_data data = {};
 270         struct scatterlist sg;
 271 
 272         /* NOTE: caller guarantees resp is heap-allocated */
 273 
 274         mode = !!mode;
 275         value &= 0xF;
 276 
 277         mrq.cmd = &cmd;
 278         mrq.data = &data;
 279 
 280         cmd.opcode = SD_SWITCH;
 281         cmd.arg = mode << 31 | 0x00FFFFFF;
 282         cmd.arg &= ~(0xF << (group * 4));
 283         cmd.arg |= value << (group * 4);
 284         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 285 
 286         data.blksz = 64;
 287         data.blocks = 1;
 288         data.flags = MMC_DATA_READ;
 289         data.sg = &sg;
 290         data.sg_len = 1;
 291 
 292         sg_init_one(&sg, resp, 64);
 293 
 294         mmc_set_data_timeout(&data, card);
 295 
 296         mmc_wait_for_req(card->host, &mrq);
 297 
 298         if (cmd.error)
 299                 return cmd.error;
 300         if (data.error)
 301                 return data.error;
 302 
 303         return 0;
 304 }
 305 
 306 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
 307 {
 308         int err;
 309         struct mmc_request mrq = {};
 310         struct mmc_command cmd = {};
 311         struct mmc_data data = {};
 312         struct scatterlist sg;
 313 
 314         /* NOTE: caller guarantees ssr is heap-allocated */
 315 
 316         err = mmc_app_cmd(card->host, card);
 317         if (err)
 318                 return err;
 319 
 320         mrq.cmd = &cmd;
 321         mrq.data = &data;
 322 
 323         cmd.opcode = SD_APP_SD_STATUS;
 324         cmd.arg = 0;
 325         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
 326 
 327         data.blksz = 64;
 328         data.blocks = 1;
 329         data.flags = MMC_DATA_READ;
 330         data.sg = &sg;
 331         data.sg_len = 1;
 332 
 333         sg_init_one(&sg, ssr, 64);
 334 
 335         mmc_set_data_timeout(&data, card);
 336 
 337         mmc_wait_for_req(card->host, &mrq);
 338 
 339         if (cmd.error)
 340                 return cmd.error;
 341         if (data.error)
 342                 return data.error;
 343 
 344         return 0;
 345 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/mmc/core/sd_ops.c

DEFINITIONS
