Tegra30: MMC: Add SD bus power-rail and SDMMC pad init routines

[people/ms/u-boot.git] / board / nvidia / cardhu / cardhu.c

diff --git a/board/nvidia/cardhu/cardhu.c b/board/nvidia/cardhu/cardhu.c
index 08e9b7bd5be83ded23930562e4b4b3ed19ba903a..3544b41cd02386013d0509363abcefde8f2ea41a 100644 (file)
--- 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 @@ void pinmux_init(void)
        /* 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 */