sandbox_mmc.c
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/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <mmc.h>
#include <asm/test.h>
DECLARE_GLOBAL_DATA_PTR;
struct sandbox_mmc_plat {
struct mmc_config cfg;
struct mmc mmc;
};
/**
* sandbox_mmc_send_cmd() - Emulate SD commands
*
* This emulate an SD card version 2. Single-block reads result in zero data.
* Multiple-block reads return a test string.
*/
static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
struct mmc_data *data)
{
switch (cmd->cmdidx) {
case MMC_CMD_ALL_SEND_CID:
break;
case SD_CMD_SEND_RELATIVE_ADDR:
cmd->response[0] = 0 << 16; /* mmc->rca */
case MMC_CMD_GO_IDLE_STATE:
break;
case SD_CMD_SEND_IF_COND:
cmd->response[0] = 0xaa;
break;
case MMC_CMD_SEND_STATUS:
cmd->response[0] = MMC_STATUS_RDY_FOR_DATA;
break;
case MMC_CMD_SELECT_CARD:
break;
case MMC_CMD_SEND_CSD:
cmd->response[0] = 0;
cmd->response[1] = 10 << 16; /* 1 << block_len */
break;
case SD_CMD_SWITCH_FUNC: {
if (!data)
break;
u32 *resp = (u32 *)data->dest;
resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY);
if ((cmd->cmdarg & 0xF) == UHS_SDR12_BUS_SPEED)
resp[4] = (cmd->cmdarg & 0xF) << 24;
break;
}
case MMC_CMD_READ_SINGLE_BLOCK:
memset(data->dest, '\0', data->blocksize);
break;
case MMC_CMD_READ_MULTIPLE_BLOCK:
strcpy(data->dest, "this is a test");
break;
case MMC_CMD_STOP_TRANSMISSION:
break;
case SD_CMD_APP_SEND_OP_COND:
cmd->response[0] = OCR_BUSY | OCR_HCS;
cmd->response[1] = 0;
cmd->response[2] = 0;
break;
case MMC_CMD_APP_CMD:
break;
case MMC_CMD_SET_BLOCKLEN:
debug("block len %d\n", cmd->cmdarg);
break;
case SD_CMD_APP_SEND_SCR: {
u32 *scr = (u32 *)data->dest;
scr[0] = cpu_to_be32(2 << 24 | 1 << 15); /* SD version 3 */
break;
}
default:
debug("%s: Unknown command %d\n", __func__, cmd->cmdidx);
break;
}
return 0;
}
static int sandbox_mmc_set_ios(struct udevice *dev)
{
return 0;
}
static int sandbox_mmc_get_cd(struct udevice *dev)
{
return 1;
}
static const struct dm_mmc_ops sandbox_mmc_ops = {
.send_cmd = sandbox_mmc_send_cmd,
.set_ios = sandbox_mmc_set_ios,
.get_cd = sandbox_mmc_get_cd,
};
int sandbox_mmc_probe(struct udevice *dev)
{
struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
return mmc_init(&plat->mmc);
}
int sandbox_mmc_bind(struct udevice *dev)
{
struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
struct mmc_config *cfg = &plat->cfg;
cfg->name = dev->name;
cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT;
cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34;
cfg->f_min = 1000000;
cfg->f_max = 52000000;
cfg->b_max = U32_MAX;
return mmc_bind(dev, &plat->mmc, cfg);
}
int sandbox_mmc_unbind(struct udevice *dev)
{
mmc_unbind(dev);
return 0;
}
static const struct udevice_id sandbox_mmc_ids[] = {
{ .compatible = "sandbox,mmc" },
{ }
};
U_BOOT_DRIVER(mmc_sandbox) = {
.name = "mmc_sandbox",
.id = UCLASS_MMC,
.of_match = sandbox_mmc_ids,
.ops = &sandbox_mmc_ops,
.bind = sandbox_mmc_bind,
.unbind = sandbox_mmc_unbind,
.probe = sandbox_mmc_probe,
.platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat),
};