ENGR00315499-12: ARM: MSL: add i2c0 support for imx6sl evk

- Add i2c0 support for imx6sl evk platform.
- Read pmic device ID and revsion ID.

Signed-off-by: Fugang Duan  <B38611@freescale.com>
Signed-off-by: Nitin Garg <nitin.garg@freescale.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/board/freescale/mx6slevk/mx6slevk.c b/board/freescale/mx6slevk/mx6slevk.c
index 7ddd553..ac0b1f3 100644
--- a/board/freescale/mx6slevk/mx6slevk.c
+++ b/board/freescale/mx6slevk/mx6slevk.c
@@ -42,11 +42,33 @@ DECLARE_GLOBAL_DATA_PTR;
 	PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED   |             \
 	PAD_CTL_DSE_40ohm   | PAD_CTL_HYS)
 
+#define I2C_PAD_CTRL    (PAD_CTL_PKE | PAD_CTL_PUE |            \
+	PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED |               \
+	PAD_CTL_DSE_40ohm | PAD_CTL_HYS |			\
+	PAD_CTL_ODE | PAD_CTL_SRE_FAST)
+
 #define EPDC_PAD_CTRL    (PAD_CTL_PKE | PAD_CTL_SPEED_MED |	\
 	PAD_CTL_DSE_40ohm | PAD_CTL_HYS)
 
 #define ETH_PHY_RESET	IMX_GPIO_NR(4, 21)
 
+#ifdef CONFIG_SYS_I2C_MXC
+#define PC MUX_PAD_CTRL(I2C_PAD_CTRL)
+/* I2C1 for PMIC */
+struct i2c_pads_info i2c_pad_info0 = {
+	.scl = {
+		.i2c_mode = MX6_PAD_I2C1_SDA__I2C1_SDA | PC,
+		.gpio_mode = MX6_PAD_I2C1_SDA__GPIO_3_13 | PC,
+		.gp = IMX_GPIO_NR(3, 13),
+	},
+	.sda = {
+		.i2c_mode = MX6_PAD_I2C1_SCL__I2C1_SCL | PC,
+		.gpio_mode = MX6_PAD_I2C1_SCL__GPIO_3_12 | PC,
+		.gp = IMX_GPIO_NR(3, 12),
+	},
+};
+#endif
+
 int dram_init(void)
 {
 	gd->ram_size = get_ram_size((void *)PHYS_SDRAM, PHYS_SDRAM_SIZE);
@@ -563,6 +585,75 @@ static int setup_fec(void)
 }
 #endif
 
+#ifdef CONFIG_SYS_I2C_MXC
+static int setup_pmic_voltages(void)
+{
+	unsigned char value, rev_id = 0;
+
+	i2c_set_bus_num(0);
+	if (!i2c_probe(0x8)) {
+		if (i2c_read(0x8, 0, 1, &value, 1)) {
+			printf("Read device ID error!\n");
+			return -1;
+		}
+		if (i2c_read(0x8, 3, 1, &rev_id, 1)) {
+			printf("Read Rev ID error!\n");
+			return -1;
+		}
+		printf("Found PFUZE100! deviceid=%x,revid=%x\n", value, rev_id);
+
+		/* set SW1AB staby volatage 0.975V */
+		if (i2c_read(0x8, 0x21, 1, &value, 1)) {
+			printf("Read SW1ABSTBY error!\n");
+			return -1;
+		}
+		value &= ~0x3f;
+		value |= 0x1b;
+		if (i2c_write(0x8, 0x21, 1, &value, 1)) {
+			printf("Set SW1ABSTBY error!\n");
+			return -1;
+		}
+
+		/* set SW1AB/VDDARM step ramp up time from 16us to 4us/25mV */
+		if (i2c_read(0x8, 0x24, 1, &value, 1)) {
+			printf("Read SW1ABCONFIG error!\n");
+			return -1;
+		}
+		value &= ~0xc0;
+		value |= 0x40;
+		if (i2c_write(0x8, 0x24, 1, &value, 1)) {
+			printf("Set SW1ABCONFIG error!\n");
+			return -1;
+		}
+
+		/* set SW1C staby volatage 0.975V */
+		if (i2c_read(0x8, 0x2f, 1, &value, 1)) {
+			printf("Read SW1CSTBY error!\n");
+			return -1;
+		}
+		value &= ~0x3f;
+		value |= 0x1b;
+		if (i2c_write(0x8, 0x2f, 1, &value, 1)) {
+			printf("Set SW1CSTBY error!\n");
+			return -1;
+		}
+
+		/* set SW1C/VDDSOC step ramp up time to from 16us to 4us/25mV */
+		if (i2c_read(0x8, 0x32, 1, &value, 1)) {
+			printf("Read SW1CCONFIG error!\n");
+			return -1;
+		}
+		value &= ~0xc0;
+		value |= 0x40;
+		if (i2c_write(0x8, 0x32, 1, &value, 1)) {
+			printf("Set SW1CCONFIG error!\n");
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
 #ifdef CONFIG_LDO_BYPASS_CHECK
 void ldo_mode_set(int ldo_bypass)
 {
@@ -598,6 +689,7 @@ void ldo_mode_set(int ldo_bypass)
 
 }
 #endif
+#endif
 
 int board_early_init_f(void)
 {
@@ -622,6 +714,15 @@ int board_init(void)
 
 int board_late_init(void)
 {
+	int ret = 0;
+
+#ifdef CONFIG_SYS_I2C_MXC
+	setup_i2c(0, CONFIG_SYS_I2C_SPEED,
+			CONFIG_SYS_I2C_SLAVE, &i2c_pad_info0);
+	ret = setup_pmic_voltages();
+	if (ret)
+		return -1;
+#endif
 
 #ifdef CONFIG_ENV_IS_IN_MMC
 	board_late_mmc_env_init();