Tegra30: MMC: Add SD bus power-rail and SDMMC pad init routines
T30 requires specific SDMMC pad programming, and bus power-rail bringup.
Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
diff --git a/board/nvidia/cardhu/cardhu.c b/board/nvidia/cardhu/cardhu.c
index 08e9b7b..3544b41 100644
--- a/board/nvidia/cardhu/cardhu.c
+++ b/board/nvidia/cardhu/cardhu.c
@@ -25,6 +25,10 @@
#include <asm/arch/pinmux.h>
#include <asm/arch/gp_padctrl.h>
#include "pinmux-config-cardhu.h"
+#include <i2c.h>
+
+#define PMU_I2C_ADDRESS 0x2D
+#define MAX_I2C_RETRY 3
/*
* Routine: pinmux_init
@@ -41,3 +45,50 @@
/* Initialize any non-default pad configs (APB_MISC_GP regs) */
padgrp_config_table(cardhu_padctrl, ARRAY_SIZE(cardhu_padctrl));
}
+
+#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 */
+
+ /* TPS659110: LDO5_REG = 3.3v, ACTIVE to SDMMC1 */
+ 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);
+ }
+
+ /* TPS659110: GPIO7_REG = PDEN, output a 1 to EN_3V3_SYS */
+ 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 */