[U-Boot] [PATCH 3/5] Tegra30: MMC: Add SD bus power-rail and SDMMC pad init routines

Tom Warren
2013-02-26T20:46:34Z

T30 requires specific SDMMC pad programming, and bus power-rail bringup.

Signed-off-by: Tom Warren <twarren@nvidia.com>
---
board/nvidia/cardhu/cardhu.c | 49 +++++++++++++++++++++++++++++++++++++++++
board/nvidia/common/board.c | 50 +++++++++++++++++++++++++++++++++++++++++-
2 files changed, 98 insertions(+), 1 deletions(-)

diff --git a/board/nvidia/cardhu/cardhu.c b/board/nvidia/cardhu/cardhu.c
index df4cb6b..363bddc 100644
--- a/board/nvidia/cardhu/cardhu.c
+++ b/board/nvidia/cardhu/cardhu.c
@@ -24,6 +24,10 @@
#include <common.h>
#include <asm/arch/pinmux.h>
#include "pinmux-config-cardhu.h"
+#include <i2c.h>
+
+#define PMU_I2C_ADDRESS 0x2D
+#define MAX_I2C_RETRY 3

/*
* Routine: pinmux_init
@@ -37,3 +41,48 @@ void pinmux_init(void)
pinmux_config_table(unused_pins_lowpower,
ARRAY_SIZE(unused_pins_lowpower));
}
+
+#if defined(CONFIG_TEGRA_MMC)
+/*
+ * Do I2C/PMU writes to bring up SD card bus power
+ *
+ */
+void board_sdmmc_voltage_init(void)
+{
+ uchar reg, data_buffer[1];
+ int i;
+
+ i2c_set_bus_num(0); /* PMU is on bus 0 */
+
+ data_buffer[0] = 0x65;
+ reg = 0x32;
+
+ for (i = 0; i < MAX_I2C_RETRY; ++i) {
+ if (i2c_write(PMU_I2C_ADDRESS, reg, 1, data_buffer, 1))
+ udelay(100);
+ }
+
+ data_buffer[0] = 0x09;
+ reg = 0x67;
+
+ for (i = 0; i < MAX_I2C_RETRY; ++i) {
+ if (i2c_write(PMU_I2C_ADDRESS, reg, 1, data_buffer, 1))
+ udelay(100);
+ }
+}
+
+/*
+ * Routine: pin_mux_mmc
+ * Description: setup the MMC muxes, power rails, etc.
+ */
+void pin_mux_mmc(void)
+{
+ /*
+ * NOTE: We don't do mmc-specific pin muxes here.
+ * They were done globally in pinmux_init().
+ */
+
+ /* Bring up the SDIO1 power rail */
+ board_sdmmc_voltage_init();
+}
+#endif /* MMC */
diff --git a/board/nvidia/common/board.c b/board/nvidia/common/board.c
index babbe08..4ca6b29 100644
--- a/board/nvidia/common/board.c
+++ b/board/nvidia/common/board.c
@@ -49,6 +49,8 @@
#include <asm/arch-tegra/usb.h>
#endif
#ifdef CONFIG_TEGRA_MMC
+#include <asm/arch/gp_padctrl.h>
+#include <asm/arch-tegra/tegra_mmc.h>
#include <asm/arch-tegra/mmc.h>
#endif
#include <i2c.h>
@@ -245,4 +247,50 @@ int board_mmc_init(bd_t *bd)

return 0;
}
-#endif
+
+void pad_init_mmc(struct tegra_mmc *reg)
+{
+#if defined(CONFIG_TEGRA30)
+ struct apb_misc_gp_ctlr *const gpc =
+ (struct apb_misc_gp_ctlr *)NV_PA_APB_MISC_GP_BASE;
+ struct tegra_mmc *const sdmmc = (struct tegra_mmc *)reg;
+ u32 val, padcfg, padmask, offset = (unsigned int)reg;
+
+ debug("%s: sdmmc address = %08x\n", __func__, (unsigned int)sdmmc);
+
+ /* Set the pad drive strength for SDMMC1 or 3 only */
+ if (offset != TEGRA_SDMMC1_BASE && offset != TEGRA_SDMMC3_BASE) {
+ debug("%s: settings are only valid for SDMMC1/SDMMC3!\n",
+ __func__);
+ return;
+ }
+
+ /* Set pads as per T30 TRM, section 24.6.1.2 */
+ padcfg = (GP_SDIOCFG_DRVUP_SLWF | GP_SDIOCFG_DRVDN_SLWR | \
+ GP_SDIOCFG_DRVUP | GP_SDIOCFG_DRVDN);
+ padmask = 0x00000FFF;
+
+ if (offset == TEGRA_SDMMC1_BASE) {
+ val = readl(&gpc->sdio1cfg);
+ val &= padmask;
+ val |= padcfg;
+ writel(val, &gpc->sdio1cfg);
+ } else {/* SDMMC3 */
+ val = readl(&gpc->sdio3cfg);
+ val &= padmask;
+ val |= padcfg;
+ writel(val, &gpc->sdio3cfg);
+ }
+
+ val = readl(&sdmmc->sdmemcmppadctl);
+ val &= 0xFFFFFFF0;
+ val |= MEMCOMP_PADCTRL_VREF;
+ writel(val, &sdmmc->sdmemcmppadctl);
+
+ val = readl(&sdmmc->autocalcfg);
+ val &= 0xFFFF0000;
+ val |= AUTO_CAL_PU_OFFSET | AUTO_CAL_PD_OFFSET | AUTO_CAL_ENABLED;
+ writel(val, &sdmmc->autocalcfg);
+#endif /* T30 */
+}
+#endif /* MMC */
--
1.7.0.4