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 mmc *mmc, 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                 u32 *resp = (u32 *)data->dest;
  52
  53                 resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY);
  54                 break;
  55         }
  56         case MMC_CMD_READ_SINGLE_BLOCK:
  57                 memset(data->dest, '\0', data->blocksize);
  58                 break;
  59         case MMC_CMD_READ_MULTIPLE_BLOCK:
  60                 strcpy(data->dest, "this is a test");
  61                 break;
  62         case MMC_CMD_STOP_TRANSMISSION:
  63                 break;
  64         case SD_CMD_APP_SEND_OP_COND:
  65                 cmd->response[0] = OCR_BUSY | OCR_HCS;
  66                 cmd->response[1] = 0;
  67                 cmd->response[2] = 0;
  68                 break;
  69         case MMC_CMD_APP_CMD:
  70                 break;
  71         case MMC_CMD_SET_BLOCKLEN:
  72                 debug("block len %d\n", cmd->cmdarg);
  73                 break;
  74         case SD_CMD_APP_SEND_SCR: {
  75                 u32 *scr = (u32 *)data->dest;
  76
  77                 scr[0] = cpu_to_be32(2 << 24 | 1 << 15);  /* SD version 3 */
  78                 break;
  79         }
  80         default:
  81                 debug("%s: Unknown command %d\n", __func__, cmd->cmdidx);
  82                 break;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static void sandbox_mmc_set_ios(struct mmc *mmc)
  89 {
  90 }
  91
  92 static int sandbox_mmc_init(struct mmc *mmc)
  93 {
  94         return 0;
  95 }
  96
  97 static int sandbox_mmc_getcd(struct mmc *mmc)
  98 {
  99         return 1;
 100 }
 101
 102 static const struct mmc_ops sandbox_mmc_ops = {
 103         .send_cmd = sandbox_mmc_send_cmd,
 104         .set_ios = sandbox_mmc_set_ios,
 105         .init = sandbox_mmc_init,
 106         .getcd = sandbox_mmc_getcd,
 107 };
 108
 109 int sandbox_mmc_probe(struct udevice *dev)
 110 {
 111         struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
 112
 113         return mmc_init(&plat->mmc);
 114 }
 115
 116 int sandbox_mmc_bind(struct udevice *dev)
 117 {
 118         struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
 119         struct mmc_config *cfg = &plat->cfg;
 120         int ret;
 121
 122         cfg->name = dev->name;
 123         cfg->ops = &sandbox_mmc_ops;
 124         cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT;
 125         cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34;
 126         cfg->f_min = 1000000;
 127         cfg->f_max = 52000000;
 128         cfg->b_max = U32_MAX;
 129
 130         ret = mmc_bind(dev, &plat->mmc, cfg);
 131         if (ret)
 132                 return ret;
 133
 134         return 0;
 135 }
 136
 137 int sandbox_mmc_unbind(struct udevice *dev)
 138 {
 139         mmc_unbind(dev);
 140
 141         return 0;
 142 }
 143
 144 static const struct udevice_id sandbox_mmc_ids[] = {
 145         { .compatible = "sandbox,mmc" },
 146         { }
 147 };
 148
 149 U_BOOT_DRIVER(mmc_sandbox) = {
 150         .name           = "mmc_sandbox",
 151         .id             = UCLASS_MMC,
 152         .of_match       = sandbox_mmc_ids,
 153         .bind           = sandbox_mmc_bind,
 154         .unbind         = sandbox_mmc_unbind,
 155         .probe          = sandbox_mmc_probe,
 156         .platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat),
 157 };