mmc: omap: config VMMC, MMC1_PBIAS

Config VMMC voltage to 3V for MMC/SD card slot
and PBIAS settings needed for OMAP4
Fixes MMC/SD detection on boot from eMMC.

Signed-off-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Aneesh V <aneesh@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

arch/arm/include/asm/arch-omap4/omap4.h

@@ -125,6 +125,10 @@
 /* CONTROL_EFUSE_2 */
 #define CONTROL_EFUSE_2_NMOS_PMOS_PTV_CODE_1		0x00ffc000
 
+#define MMC1_PWRDNZ					(1 << 26)
+#define MMC1_PBIASLITE_PWRDNZ				(1 << 22)
+#define MMC1_PBIASLITE_VMODE				(1 << 21)
+
 #ifndef __ASSEMBLY__
 
 struct s32ktimer {
@@ -141,7 +145,9 @@ struct omap4_sys_ctrl_regs {
 	unsigned int control_ldosram_iva_voltage_ctrl;	/* 0x4A002320 */
 	unsigned int control_ldosram_mpu_voltage_ctrl;	/* 0x4A002324 */
 	unsigned int control_ldosram_core_voltage_ctrl;	/* 0x4A002328 */
-	unsigned int pad3[260341];
+	unsigned int pad3[260277];
+	unsigned int control_pbiaslite;			/* 0x4A100600 */
+	unsigned int pad4[63];
 	unsigned int control_efuse_1;			/* 0x4A100700 */
 	unsigned int control_efuse_2;			/* 0x4A100704 */
 };

drivers/mmc/omap_hsmmc.c

@@ -28,6 +28,7 @@
 #include <part.h>
 #include <i2c.h>
 #include <twl4030.h>
+#include <twl6030.h>
 #include <asm/io.h>
 #include <asm/arch/mmc_host_def.h>
 #include <asm/arch/sys_proto.h>
@@ -38,7 +39,27 @@
 static int mmc_read_data(hsmmc_t *mmc_base, char *buf, unsigned int size);
 static int mmc_write_data(hsmmc_t *mmc_base, const char *buf, unsigned int siz);
 static struct mmc hsmmc_dev[2];
-unsigned char mmc_board_init(hsmmc_t *mmc_base)
+
+#if defined(CONFIG_OMAP44XX) && defined(CONFIG_TWL6030_POWER)
+static void omap4_vmmc_pbias_config(struct mmc *mmc)
+{
+	u32 value = 0;
+	struct omap4_sys_ctrl_regs *const ctrl =
+		(struct omap4_sys_ctrl_regs *)SYSCTRL_GENERAL_CORE_BASE;
+
+
+	value = readl(&ctrl->control_pbiaslite);
+	value &= ~(MMC1_PBIASLITE_PWRDNZ | MMC1_PWRDNZ);
+	writel(value, &ctrl->control_pbiaslite);
+	/* set VMMC to 3V */
+	twl6030_power_mmc_init();
+	value = readl(&ctrl->control_pbiaslite);
+	value |= MMC1_PBIASLITE_VMODE | MMC1_PBIASLITE_PWRDNZ | MMC1_PWRDNZ;
+	writel(value, &ctrl->control_pbiaslite);
+}
+#endif
+
+unsigned char mmc_board_init(struct mmc *mmc)
 {
 #if defined(CONFIG_TWL4030_POWER)
 	twl4030_power_mmc_init();
@@ -67,7 +88,11 @@ unsigned char mmc_board_init(hsmmc_t *mmc_base)
 		&prcm_base->iclken1_core);
 #endif
 
-/* TODO add appropriate OMAP4 init - none currently necessary */
+#if defined(CONFIG_OMAP44XX) && defined(CONFIG_TWL6030_POWER)
+	/* PBIAS config needed for MMC1 only */
+	if (mmc->block_dev.dev == 0)
+		omap4_vmmc_pbias_config(mmc);
+#endif
 
 	return 0;
 }
@@ -108,7 +133,7 @@ static int mmc_init_setup(struct mmc *mmc)
 	unsigned int dsor;
 	ulong start;
 
-	mmc_board_init(mmc_base);
+	mmc_board_init(mmc);
 
 	writel(readl(&mmc_base->sysconfig) | MMC_SOFTRESET,
 		&mmc_base->sysconfig);

drivers/power/twl6030.c

@@ -182,6 +182,13 @@ void twl6030_init_battery_charging(void)
 	return;
 }
 
+void twl6030_power_mmc_init()
+{
+	/* set voltage to 3.0 and turnon for APP */
+	twl6030_i2c_write_u8(TWL6030_CHIP_PM, 0x15, VMMC_CFG_VOLTATE);
+	twl6030_i2c_write_u8(TWL6030_CHIP_PM, 0x21, VMMC_CFG_STATE);
+}
+
 void twl6030_usb_device_settings()
 {
 	u8 data = 0;

include/configs/omap4_common.h

@@ -98,7 +98,9 @@
 #define CONFIG_I2C_MULTI_BUS		1
 
 /* TWL6030 */
+#ifndef CONFIG_SPL_BUILD
 #define CONFIG_TWL6030_POWER		1
+#endif
 
 /* MMC */
 #define CONFIG_GENERIC_MMC		1

include/configs/omap4_sdp4430.h

@@ -37,7 +37,9 @@
 #include <configs/omap4_common.h>
 
 /* Battery Charger */
+#ifndef CONFIG_SPL_BUILD
 #define CONFIG_CMD_BAT			1
+#endif
 
 /* ENV related config options */
 #define CONFIG_ENV_IS_IN_MMC		1

include/twl6030.h

@@ -33,6 +33,8 @@
 #define TWL6030_CHIP_PWM	0x49
 
 /* Slave Address 0x48 */
+#define VMMC_CFG_STATE		0x9A
+#define VMMC_CFG_VOLTATE	0x9B
 #define VUSB_CFG_STATE		0xA2
 
 #define MISC1			0xE4
@@ -130,3 +132,4 @@ void twl6030_start_usb_charging(void);
 void twl6030_stop_usb_charging(void);
 int twl6030_get_battery_voltage(void);
 int twl6030_get_battery_current(void);
+void twl6030_power_mmc_init(void);