drivers/mmc/sandbox_mmc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <fdtdec.h>
  11 #include <log.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                 memset(cmd->response, '\0', sizeof(cmd->response));
  32                 break;
  33         case SD_CMD_SEND_RELATIVE_ADDR:
  34                 cmd->response[0] = 0 << 16; /* mmc->rca */
  35         case MMC_CMD_GO_IDLE_STATE:
  36                 break;
  37         case SD_CMD_SEND_IF_COND:
  38                 cmd->response[0] = 0xaa;
  39                 break;
  40         case MMC_CMD_SEND_STATUS:
  41                 cmd->response[0] = MMC_STATUS_RDY_FOR_DATA;
  42                 break;
  43         case MMC_CMD_SELECT_CARD:
  44                 break;
  45         case MMC_CMD_SEND_CSD:
  46                 cmd->response[0] = 0;
  47                 cmd->response[1] = 10 << 16;    /* 1 << block_len */
  48                 cmd->response[2] = 0;
  49                 cmd->response[3] = 0;
  50                 break;
  51         case SD_CMD_SWITCH_FUNC: {
  52                 if (!data)
  53                         break;
  54                 u32 *resp = (u32 *)data->dest;
  55                 resp[3] = 0;
  56                 resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY);
  57                 if ((cmd->cmdarg & 0xF) == UHS_SDR12_BUS_SPEED)
  58                         resp[4] = (cmd->cmdarg & 0xF) << 24;
  59                 break;
  60         }
  61         case MMC_CMD_READ_SINGLE_BLOCK:
  62                 memset(data->dest, '\0', data->blocksize);
  63                 break;
  64         case MMC_CMD_READ_MULTIPLE_BLOCK:
  65                 strcpy(data->dest, "this is a test");
  66                 break;
  67         case MMC_CMD_STOP_TRANSMISSION:
  68                 break;
  69         case SD_CMD_APP_SEND_OP_COND:
  70                 cmd->response[0] = OCR_BUSY | OCR_HCS;
  71                 cmd->response[1] = 0;
  72                 cmd->response[2] = 0;
  73                 break;
  74         case MMC_CMD_APP_CMD:
  75                 break;
  76         case MMC_CMD_SET_BLOCKLEN:
  77                 debug("block len %d\n", cmd->cmdarg);
  78                 break;
  79         case SD_CMD_APP_SEND_SCR: {
  80                 u32 *scr = (u32 *)data->dest;
  81
  82                 scr[0] = cpu_to_be32(2 << 24 | 1 << 15);  /* SD version 3 */
  83                 break;
  84         }
  85         default:
  86                 debug("%s: Unknown command %d\n", __func__, cmd->cmdidx);
  87                 break;
  88         }
  89
  90         return 0;
  91 }
  92
  93 static int sandbox_mmc_set_ios(struct udevice *dev)
  94 {
  95         return 0;
  96 }
  97
  98 static int sandbox_mmc_get_cd(struct udevice *dev)
  99 {
 100         return 1;
 101 }
 102
 103 static const struct dm_mmc_ops sandbox_mmc_ops = {
 104         .send_cmd = sandbox_mmc_send_cmd,
 105         .set_ios = sandbox_mmc_set_ios,
 106         .get_cd = sandbox_mmc_get_cd,
 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
 121         cfg->name = dev->name;
 122         cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT;
 123         cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34;
 124         cfg->f_min = 1000000;
 125         cfg->f_max = 52000000;
 126         cfg->b_max = U32_MAX;
 127
 128         return mmc_bind(dev, &plat->mmc, cfg);
 129 }
 130
 131 int sandbox_mmc_unbind(struct udevice *dev)
 132 {
 133         mmc_unbind(dev);
 134
 135         return 0;
 136 }
 137
 138 static const struct udevice_id sandbox_mmc_ids[] = {
 139         { .compatible = "sandbox,mmc" },
 140         { }
 141 };
 142
 143 U_BOOT_DRIVER(mmc_sandbox) = {
 144         .name           = "mmc_sandbox",
 145         .id             = UCLASS_MMC,
 146         .of_match       = sandbox_mmc_ids,
 147         .ops            = &sandbox_mmc_ops,
 148         .bind           = sandbox_mmc_bind,
 149         .unbind         = sandbox_mmc_unbind,
 150         .probe          = sandbox_mmc_probe,
 151         .platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat),
 152 };