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mmc: meson-gx: add support for mmc-pwrseq-emmc

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Add support for mmc-pwrseq-emmc in the meson-gx mmc driver to support
enabling the eMMC.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong 2019-10-11 17:33:52 +02:00
parent dabd6a9bf7
commit a10388dc69
1 changed files with 51 additions and 0 deletions
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51
drivers/mmc/meson_gx_mmc.c
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@ -7,8 +7,10 @@
#include <dm.h>
#include <fdtdec.h>
#include <malloc.h>
#include <pwrseq.h>
#include <mmc.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/arch/sd_emmc.h>
#include <linux/log2.h>
@ -239,6 +241,10 @@ static int meson_mmc_probe(struct udevice *dev)
struct mmc *mmc = &pdata->mmc;
struct mmc_config *cfg = &pdata->cfg;
uint32_t val;
#ifdef CONFIG_PWRSEQ
struct udevice *pwr_dev;
int ret;
#endif
cfg->voltages = MMC_VDD_33_34 | MMC_VDD_32_33 |
MMC_VDD_31_32 | MMC_VDD_165_195;
@ -254,6 +260,17 @@ static int meson_mmc_probe(struct udevice *dev)
mmc_set_clock(mmc, cfg->f_min, MMC_CLK_ENABLE);
#ifdef CONFIG_PWRSEQ
/* Enable power if needed */
ret = uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq",
&pwr_dev);
if (!ret) {
ret = pwrseq_set_power(pwr_dev, true);
if (ret)
return ret;
}
#endif
/* reset all status bits */
meson_write(mmc, STATUS_MASK, MESON_SD_EMMC_STATUS);
@ -292,3 +309,37 @@ U_BOOT_DRIVER(meson_mmc) = {
.ofdata_to_platdata = meson_mmc_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct meson_mmc_platdata),
};
#ifdef CONFIG_PWRSEQ
static int meson_mmc_pwrseq_set_power(struct udevice *dev, bool enable)
{
struct gpio_desc reset;
int ret;
ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT);
if (ret)
return ret;
dm_gpio_set_value(&reset, 1);
udelay(1);
dm_gpio_set_value(&reset, 0);
udelay(200);
return 0;
}
static const struct pwrseq_ops meson_mmc_pwrseq_ops = {
.set_power = meson_mmc_pwrseq_set_power,
};
static const struct udevice_id meson_mmc_pwrseq_ids[] = {
{ .compatible = "mmc-pwrseq-emmc" },
{ }
};
U_BOOT_DRIVER(meson_mmc_pwrseq_drv) = {
.name = "mmc_pwrseq_emmc",
.id = UCLASS_PWRSEQ,
.of_match = meson_mmc_pwrseq_ids,
.ops = &meson_mmc_pwrseq_ops,
};
#endif