drivers/mmc/sandbox_mmc.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <fdtdec.h>
  12 #include <mmc.h>
  13 #include <asm/test.h>
  14
  15 struct sandbox_mmc_plat {
  16         struct mmc_config cfg;
  17         struct mmc mmc;
  18 };
  19
  20 /**
  21  * sandbox_mmc_send_cmd() - Emulate SD commands
  22  *
  23  * This emulate an SD card version 2. Single-block reads result in zero data.
  24  * Multiple-block reads return a test string.
  25  */
  26 static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
  27                                 struct mmc_data *data)
  28 {
  29         switch (cmd->cmdidx) {
  30         case MMC_CMD_ALL_SEND_CID:
  31                 break;
  32         case SD_CMD_SEND_RELATIVE_ADDR:
  33                 cmd->response[0] = 0 << 16; /* mmc->rca */
  34         case MMC_CMD_GO_IDLE_STATE:
  35                 break;
  36         case SD_CMD_SEND_IF_COND:
  37                 cmd->response[0] = 0xaa;
  38                 break;
  39         case MMC_CMD_SEND_STATUS:
  40                 cmd->response[0] = MMC_STATUS_RDY_FOR_DATA;
  41                 break;
  42         case MMC_CMD_SELECT_CARD:
  43                 break;
  44         case MMC_CMD_SEND_CSD:
  45                 cmd->response[0] = 0;
  46                 cmd->response[1] = 10 << 16;    /* 1 << block_len */
  47                 break;
  48         case SD_CMD_SWITCH_FUNC: {
  49                 if (!data)
  50                         break;
  51                 u32 *resp = (u32 *)data->dest;
  52                 resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY);
  53                 if ((cmd->cmdarg & 0xF) == UHS_SDR12_BUS_SPEED)
  54                         resp[4] = (cmd->cmdarg & 0xF) << 24;
  55                 break;
  56         }
  57         case MMC_CMD_READ_SINGLE_BLOCK:
  58                 memset(data->dest, '\0', data->blocksize);
  59                 break;
  60         case MMC_CMD_READ_MULTIPLE_BLOCK:
  61                 strcpy(data->dest, "this is a test");
  62                 break;
  63         case MMC_CMD_STOP_TRANSMISSION:
  64                 break;
  65         case SD_CMD_APP_SEND_OP_COND:
  66                 cmd->response[0] = OCR_BUSY | OCR_HCS;
  67                 cmd->response[1] = 0;
  68                 cmd->response[2] = 0;
  69                 break;
  70         case MMC_CMD_APP_CMD:
  71                 break;
  72         case MMC_CMD_SET_BLOCKLEN:
  73                 debug("block len %d\n", cmd->cmdarg);
  74                 break;
  75         case SD_CMD_APP_SEND_SCR: {
  76                 u32 *scr = (u32 *)data->dest;
  77
  78                 scr[0] = cpu_to_be32(2 << 24 | 1 << 15);  /* SD version 3 */
  79                 break;
  80         }
  81         default:
  82                 debug("%s: Unknown command %d\n", __func__, cmd->cmdidx);
  83                 break;
  84         }
  85
  86         return 0;
  87 }
  88
  89 static int sandbox_mmc_set_ios(struct udevice *dev)
  90 {
  91         return 0;
  92 }
  93
  94 static int sandbox_mmc_get_cd(struct udevice *dev)
  95 {
  96         return 1;
  97 }
  98
  99 static const struct dm_mmc_ops sandbox_mmc_ops = {
 100         .send_cmd = sandbox_mmc_send_cmd,
 101         .set_ios = sandbox_mmc_set_ios,
 102         .get_cd = sandbox_mmc_get_cd,
 103 };
 104
 105 int sandbox_mmc_probe(struct udevice *dev)
 106 {
 107         struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
 108
 109         return mmc_init(&plat->mmc);
 110 }
 111
 112 int sandbox_mmc_bind(struct udevice *dev)
 113 {
 114         struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
 115         struct mmc_config *cfg = &plat->cfg;
 116
 117         cfg->name = dev->name;
 118         cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT;
 119         cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34;
 120         cfg->f_min = 1000000;
 121         cfg->f_max = 52000000;
 122         cfg->b_max = U32_MAX;
 123
 124         return mmc_bind(dev, &plat->mmc, cfg);
 125 }
 126
 127 int sandbox_mmc_unbind(struct udevice *dev)
 128 {
 129         mmc_unbind(dev);
 130
 131         return 0;
 132 }
 133
 134 static const struct udevice_id sandbox_mmc_ids[] = {
 135         { .compatible = "sandbox,mmc" },
 136         { }
 137 };
 138
 139 U_BOOT_DRIVER(mmc_sandbox) = {
 140         .name           = "mmc_sandbox",
 141         .id             = UCLASS_MMC,
 142         .of_match       = sandbox_mmc_ids,
 143         .ops            = &sandbox_mmc_ops,
 144         .bind           = sandbox_mmc_bind,
 145         .unbind         = sandbox_mmc_unbind,
 146         .probe          = sandbox_mmc_probe,
 147         .platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat),
 148 };