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mci: tegra: apply pad autocalibration on T30 

Needed for SD cards connected to sdmmc1 or sdmmc3
to work properly.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Lucas Stach 2014-05-14 22:45:40 +02:00 committed by Sascha Hauer
parent 1fc137d4cd
commit ce41b64299
1 changed files with 25 additions and 0 deletions
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25
drivers/mci/tegra-sdmmc.c
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@ -59,6 +59,14 @@
#define TEGRA_SDMMC_INT_SIG_EN 0x038
#define TEGRA_SDMMC_INT_SIG_EN_XFER_COMPLETE (1 << 1)
#define TEGRA_SDMMC_SDMEMCOMPPADCTRL 0x1e0
#define TEGRA_SDMMC_SDMEMCOMPPADCTRL_VREF_SEL_SHIFT 0
#define TEGRA_SDMMC_AUTO_CAL_CONFIG 0x1e4
#define TEGRA_SDMMC_AUTO_CAL_CONFIG_PU_OFFSET_SHIFT 0
#define TEGRA_SDMMC_AUTO_CAL_CONFIG_PD_OFFSET_SHIFT 8
#define TEGRA_SDMMC_AUTO_CAL_CONFIG_ENABLE (1 << 29)
struct tegra_sdmmc_host {
struct mci_host mci;
void __iomem *regs;
@ -333,6 +341,23 @@ static int tegra_sdmmc_init(struct mci_host *mci, struct device_d *dev)
val |= TEGRA_SDMMC_PWR_CNTL_33_V | TEGRA_SDMMC_PWR_CNTL_SD_BUS;
writel(val, regs + TEGRA_SDMMC_PWR_CNTL);
/* sdmmc1 and sdmmc3 on T30 need a bit of padctrl init */
if (of_device_is_compatible(mci->hw_dev->device_node,
"nvidia,tegra30-sdhci") &&
((u32)regs == 0x78000000 || (u32)regs == 78000400)) {
val = readl(regs + TEGRA_SDMMC_SDMEMCOMPPADCTRL);
val &= 0xfffffff0;
val |= 0x7 << TEGRA_SDMMC_SDMEMCOMPPADCTRL_VREF_SEL_SHIFT;
writel(val, regs + TEGRA_SDMMC_SDMEMCOMPPADCTRL);
val = readl(regs + TEGRA_SDMMC_AUTO_CAL_CONFIG);
val &= 0xffff0000;
val |= (0x62 << TEGRA_SDMMC_AUTO_CAL_CONFIG_PU_OFFSET_SHIFT) |
(0x70 << TEGRA_SDMMC_AUTO_CAL_CONFIG_PD_OFFSET_SHIFT) |
TEGRA_SDMMC_AUTO_CAL_CONFIG_ENABLE;
writel(val, regs + TEGRA_SDMMC_AUTO_CAL_CONFIG);
}
/* setup signaling */
writel(0xffffffff, regs + TEGRA_SDMMC_INT_STAT_EN);
writel(0xffffffff, regs + TEGRA_SDMMC_INT_SIG_EN);