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 DECLARE_GLOBAL_DATA_PTR;
  16
  17 struct sandbox_mmc_plat {
  18         struct mmc_config cfg;
  19         struct mmc mmc;
  20 };
  21
  22 /**
  23  * sandbox_mmc_send_cmd() - Emulate SD commands
  24  *
  25  * This emulate an SD card version 2. Single-block reads result in zero data.
  26  * Multiple-block reads return a test string.
  27  */
  28 static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
  29                                 struct mmc_data *data)
  30 {
  31         switch (cmd->cmdidx) {
  32         case MMC_CMD_ALL_SEND_CID:
  33                 break;
  34         case SD_CMD_SEND_RELATIVE_ADDR:
  35                 cmd->response[0] = 0 << 16; /* mmc->rca */
  36         case MMC_CMD_GO_IDLE_STATE:
  37                 break;
  38         case SD_CMD_SEND_IF_COND:
  39                 cmd->response[0] = 0xaa;
  40                 break;
  41         case MMC_CMD_SEND_STATUS:
  42                 cmd->response[0] = MMC_STATUS_RDY_FOR_DATA;
  43                 break;
  44         case MMC_CMD_SELECT_CARD:
  45                 break;
  46         case MMC_CMD_SEND_CSD:
  47                 cmd->response[0] = 0;
  48                 cmd->response[1] = 10 << 16;    /* 1 << block_len */
  49                 break;
  50         case SD_CMD_SWITCH_FUNC: {
  51                 if (!data)
  52                         break;
  53                 u32 *resp = (u32 *)data->dest;
  54                 resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY);
  55                 if ((cmd->cmdarg & 0xF) == UHS_SDR12_BUS_SPEED)
  56                         resp[4] = (cmd->cmdarg & 0xF) << 24;
  57                 break;
  58         }
  59         case MMC_CMD_READ_SINGLE_BLOCK:
  60                 memset(data->dest, '\0', data->blocksize);
  61                 break;
  62         case MMC_CMD_READ_MULTIPLE_BLOCK:
  63                 strcpy(data->dest, "this is a test");
  64                 break;
  65         case MMC_CMD_STOP_TRANSMISSION:
  66                 break;
  67         case SD_CMD_APP_SEND_OP_COND:
  68                 cmd->response[0] = OCR_BUSY | OCR_HCS;
  69                 cmd->response[1] = 0;
  70                 cmd->response[2] = 0;
  71                 break;
  72         case MMC_CMD_APP_CMD:
  73                 break;
  74         case MMC_CMD_SET_BLOCKLEN:
  75                 debug("block len %d\n", cmd->cmdarg);
  76                 break;
  77         case SD_CMD_APP_SEND_SCR: {
  78                 u32 *scr = (u32 *)data->dest;
  79
  80                 scr[0] = cpu_to_be32(2 << 24 | 1 << 15);  /* SD version 3 */
  81                 break;
  82         }
  83         default:
  84                 debug("%s: Unknown command %d\n", __func__, cmd->cmdidx);
  85                 break;
  86         }
  87
  88         return 0;
  89 }
  90
  91 static int sandbox_mmc_set_ios(struct udevice *dev)
  92 {
  93         return 0;
  94 }
  95
  96 static int sandbox_mmc_get_cd(struct udevice *dev)
  97 {
  98         return 1;
  99 }
 100
 101 static const struct dm_mmc_ops sandbox_mmc_ops = {
 102         .send_cmd = sandbox_mmc_send_cmd,
 103         .set_ios = sandbox_mmc_set_ios,
 104         .get_cd = sandbox_mmc_get_cd,
 105 };
 106
 107 int sandbox_mmc_probe(struct udevice *dev)
 108 {
 109         struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
 110
 111         return mmc_init(&plat->mmc);
 112 }
 113
 114 int sandbox_mmc_bind(struct udevice *dev)
 115 {
 116         struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
 117         struct mmc_config *cfg = &plat->cfg;
 118
 119         cfg->name = dev->name;
 120         cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT;
 121         cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34;
 122         cfg->f_min = 1000000;
 123         cfg->f_max = 52000000;
 124         cfg->b_max = U32_MAX;
 125
 126         return mmc_bind(dev, &plat->mmc, cfg);
 127 }
 128
 129 int sandbox_mmc_unbind(struct udevice *dev)
 130 {
 131         mmc_unbind(dev);
 132
 133         return 0;
 134 }
 135
 136 static const struct udevice_id sandbox_mmc_ids[] = {
 137         { .compatible = "sandbox,mmc" },
 138         { }
 139 };
 140
 141 U_BOOT_DRIVER(mmc_sandbox) = {
 142         .name           = "mmc_sandbox",
 143         .id             = UCLASS_MMC,
 144         .of_match       = sandbox_mmc_ids,
 145         .ops            = &sandbox_mmc_ops,
 146         .bind           = sandbox_mmc_bind,
 147         .unbind         = sandbox_mmc_unbind,
 148         .probe          = sandbox_mmc_probe,
 149         .platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat),
 150 };