From 2d348a1652f1d1211ab82cb0c7a57a3362830d71 Mon Sep 17 00:00:00 2001 From: Tom Warren Date: Tue, 26 Feb 2013 12:31:26 -0700 Subject: [PATCH] mmc: Tegra: Add SD bus power/voltage function and MMC pad init call. Tegra30 requires the SD Bus Voltage & Power bits be set in the SD Power Control register. Tegra20 works w/o them set, but do it anyway for those SoCs as it's part of the SD spec. Also call a common board pad init routine (pad_init_mmc) in mmc_reset(), used by Tegra30 only for now. Note that Tegra20 SD/MMC HW differs enough from Tegra20 that a new compatible entry is used in the fdt compat_names/id tables. Signed-off-by: Tom Warren Reviewed-by: Stephen Warren --- drivers/mmc/tegra_mmc.c | 63 +++++++++++++++++++++++++++++++++++------ 1 file changed, 55 insertions(+), 8 deletions(-) diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c index 455a690b7e..e86bc680ff 100644 --- a/drivers/mmc/tegra_mmc.c +++ b/drivers/mmc/tegra_mmc.c @@ -21,7 +21,6 @@ #include #include -#include #include #include #include @@ -38,6 +37,38 @@ struct mmc_host mmc_host[MAX_HOSTS]; #error "Please enable device tree support to use this driver" #endif +static void mmc_set_power(struct mmc_host *host, unsigned short power) +{ + u8 pwr = 0; + debug("%s: power = %x\n", __func__, power); + + if (power != (unsigned short)-1) { + switch (1 << power) { + case MMC_VDD_165_195: + pwr = TEGRA_MMC_PWRCTL_SD_BUS_VOLTAGE_V1_8; + break; + case MMC_VDD_29_30: + case MMC_VDD_30_31: + pwr = TEGRA_MMC_PWRCTL_SD_BUS_VOLTAGE_V3_0; + break; + case MMC_VDD_32_33: + case MMC_VDD_33_34: + pwr = TEGRA_MMC_PWRCTL_SD_BUS_VOLTAGE_V3_3; + break; + } + } + debug("%s: pwr = %X\n", __func__, pwr); + + /* Set the bus voltage first (if any) */ + writeb(pwr, &host->reg->pwrcon); + if (pwr == 0) + return; + + /* Now enable bus power */ + pwr |= TEGRA_MMC_PWRCTL_SD_BUS_POWER; + writeb(pwr, &host->reg->pwrcon); +} + static void mmc_prepare_data(struct mmc_host *host, struct mmc_data *data, struct bounce_buffer *bbstate) { @@ -334,8 +365,7 @@ static void mmc_change_clock(struct mmc_host *host, uint clock) debug(" mmc_change_clock called\n"); /* - * Change Tegra SDMMCx clock divisor here. Source is 216MHz, - * PLLP_OUT0 + * Change Tegra SDMMCx clock divisor here. Source is PLLP_OUT0 */ if (clock == 0) goto out; @@ -410,7 +440,7 @@ static void mmc_set_ios(struct mmc *mmc) debug("mmc_set_ios: hostctl = %08X\n", ctrl); } -static void mmc_reset(struct mmc_host *host) +static void mmc_reset(struct mmc_host *host, struct mmc *mmc) { unsigned int timeout; debug(" mmc_reset called\n"); @@ -436,6 +466,14 @@ static void mmc_reset(struct mmc_host *host) timeout--; udelay(1000); } + + /* Set SD bus voltage & enable bus power */ + mmc_set_power(host, fls(mmc->voltages) - 1); + debug("%s: power control = %02X, host control = %02X\n", __func__, + readb(&host->reg->pwrcon), readb(&host->reg->hostctl)); + + /* Make sure SDIO pads are set up */ + pad_init_mmc(host); } static int mmc_core_init(struct mmc *mmc) @@ -444,7 +482,7 @@ static int mmc_core_init(struct mmc *mmc) unsigned int mask; debug(" mmc_core_init called\n"); - mmc_reset(host); + mmc_reset(host, mmc); host->version = readw(&host->reg->hcver); debug("host version = %x\n", host->version); @@ -642,12 +680,21 @@ void tegra_mmc_init(void) const void *blob = gd->fdt_blob; debug("%s entry\n", __func__); + /* See if any Tegra30 MMC controllers are present */ count = fdtdec_find_aliases_for_id(blob, "sdhci", - COMPAT_NVIDIA_TEGRA20_SDMMC, node_list, MAX_HOSTS); - debug("%s: count of sdhci nodes is %d\n", __func__, count); + COMPAT_NVIDIA_TEGRA30_SDMMC, node_list, MAX_HOSTS); + debug("%s: count of T30 sdhci nodes is %d\n", __func__, count); + if (process_nodes(blob, node_list, count)) { + printf("%s: Error processing T30 mmc node(s)!\n", __func__); + return; + } + /* Now look for any Tegra20 MMC controllers */ + count = fdtdec_find_aliases_for_id(blob, "sdhci", + COMPAT_NVIDIA_TEGRA20_SDMMC, node_list, MAX_HOSTS); + debug("%s: count of T20 sdhci nodes is %d\n", __func__, count); if (process_nodes(blob, node_list, count)) { - printf("%s: Error processing mmc node(s)!\n", __func__); + printf("%s: Error processing T20 mmc node(s)!\n", __func__); return; } } -- 2.25.1