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 --- drivers/mmc/meson_gx_mmc.c | 51 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+)
diff --git a/drivers/mmc/meson_gx_mmc.c b/drivers/mmc/meson_gx_mmc.c index 767dfff805..031cc79ccb 100644 --- a/drivers/mmc/meson_gx_mmc.c +++ b/drivers/mmc/meson_gx_mmc.c @@ -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