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 twarren@nvidia.com --- v2: - pass mmc 'host' struct to pad_init_mmc - probe for Tegra30 SDMMC id in tegra_mmc_init V3: - no change
drivers/mmc/tegra_mmc.c | 63 +++++++++++++++++++++++++++++++++++++++++------ 1 files changed, 55 insertions(+), 8 deletions(-)
diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c index 6063d08..8f5f1a5 100644 --- a/drivers/mmc/tegra_mmc.c +++ b/drivers/mmc/tegra_mmc.c @@ -21,7 +21,6 @@
#include <bouncebuf.h> #include <common.h> -#include <fdtdec.h> #include <asm/gpio.h> #include <asm/io.h> #include <asm/arch/clock.h> @@ -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); @@ -641,12 +679,21 @@ 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; } }