sti_sdhci.c
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/*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <mmc.h>
#include <reset-uclass.h>
#include <sdhci.h>
#include <asm/arch/sdhci.h>
DECLARE_GLOBAL_DATA_PTR;
struct sti_sdhci_plat {
struct mmc_config cfg;
struct mmc mmc;
struct reset_ctl reset;
int instance;
};
/**
* sti_mmc_core_config: configure the Arasan HC
* @dev : udevice
*
* Description: this function is to configure the Arasan MMC HC.
* This should be called when the system starts in case of, on the SoC,
* it is needed to configure the host controller.
* This happens on some SoCs, i.e. StiH410, where the MMC0 inside the flashSS
* needs to be configured as MMC 4.5 to have full capabilities.
* W/o these settings the SDHCI could configure and use the embedded controller
* with limited features.
*/
static int sti_mmc_core_config(struct udevice *dev)
{
struct sti_sdhci_plat *plat = dev_get_platdata(dev);
struct sdhci_host *host = dev_get_priv(dev);
int ret;
/* only MMC1 has a reset line */
if (plat->instance) {
ret = reset_deassert(&plat->reset);
if (ret < 0) {
pr_err("MMC1 deassert failed: %d", ret);
return ret;
}
}
writel(STI_FLASHSS_MMC_CORE_CONFIG_1,
host->ioaddr + FLASHSS_MMC_CORE_CONFIG_1);
if (plat->instance) {
writel(STI_FLASHSS_MMC_CORE_CONFIG2,
host->ioaddr + FLASHSS_MMC_CORE_CONFIG_2);
writel(STI_FLASHSS_MMC_CORE_CONFIG3,
host->ioaddr + FLASHSS_MMC_CORE_CONFIG_3);
} else {
writel(STI_FLASHSS_SDCARD_CORE_CONFIG2,
host->ioaddr + FLASHSS_MMC_CORE_CONFIG_2);
writel(STI_FLASHSS_SDCARD_CORE_CONFIG3,
host->ioaddr + FLASHSS_MMC_CORE_CONFIG_3);
}
writel(STI_FLASHSS_MMC_CORE_CONFIG4,
host->ioaddr + FLASHSS_MMC_CORE_CONFIG_4);
return 0;
}
static int sti_sdhci_probe(struct udevice *dev)
{
struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
struct sti_sdhci_plat *plat = dev_get_platdata(dev);
struct sdhci_host *host = dev_get_priv(dev);
int ret;
/*
* identify current mmc instance, mmc1 has a reset, not mmc0
* MMC0 is wired to the SD slot,
* MMC1 is wired on the high speed connector
*/
ret = reset_get_by_index(dev, 0, &plat->reset);
if (!ret)
plat->instance = 1;
else
if (ret == -ENOENT)
plat->instance = 0;
else
return ret;
ret = sti_mmc_core_config(dev);
if (ret)
return ret;
host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD |
SDHCI_QUIRK_32BIT_DMA_ADDR |
SDHCI_QUIRK_NO_HISPD_BIT;
host->host_caps = MMC_MODE_DDR_52MHz;
ret = sdhci_setup_cfg(&plat->cfg, host, 50000000, 400000);
if (ret)
return ret;
host->mmc = &plat->mmc;
host->mmc->priv = host;
host->mmc->dev = dev;
upriv->mmc = host->mmc;
return sdhci_probe(dev);
}
static int sti_sdhci_ofdata_to_platdata(struct udevice *dev)
{
struct sdhci_host *host = dev_get_priv(dev);
host->name = strdup(dev->name);
host->ioaddr = (void *)devfdt_get_addr(dev);
host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
"bus-width", 4);
return 0;
}
static int sti_sdhci_bind(struct udevice *dev)
{
struct sti_sdhci_plat *plat = dev_get_platdata(dev);
return sdhci_bind(dev, &plat->mmc, &plat->cfg);
}
static const struct udevice_id sti_sdhci_ids[] = {
{ .compatible = "st,sdhci" },
{ }
};
U_BOOT_DRIVER(sti_mmc) = {
.name = "sti_sdhci",
.id = UCLASS_MMC,
.of_match = sti_sdhci_ids,
.bind = sti_sdhci_bind,
.ops = &sdhci_ops,
.ofdata_to_platdata = sti_sdhci_ofdata_to_platdata,
.probe = sti_sdhci_probe,
.priv_auto_alloc_size = sizeof(struct sdhci_host),
.platdata_auto_alloc_size = sizeof(struct sti_sdhci_plat),
};