LXR linux/drivers/mmc/core/sd

   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
  21int 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}
  49EXPORT_SYMBOL_GPL(mmc_app_cmd);
  50
  51static 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
  96int 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
 117int 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
 161int 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
 192int 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
 210int 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
 264int 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
 306int 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}
 346