[U-Boot] [PATCH 1/2] pmic:max77686: add function to set voltage and mode

[Piotr Wilczek]

This patch add new functions to pmic max77686 to set voltage and mode.

Signed-off-by: Piotr Wilczek <p.wilczek at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
CC: Minkyu Kang <mk7.kang at samsung.com>
CC: Rajeshwari Shinde <rajeshwari.s at samsung.com>
---
 drivers/power/pmic/pmic_max77686.c |  186 ++++++++++++++++++++++++++++++++++++
 include/power/max77686_pmic.h      |   11 +++
 2 files changed, 197 insertions(+)

diff --git a/drivers/power/pmic/pmic_max77686.c b/drivers/power/pmic/pmic_max77686.c
index 7fcb4c0..3895bc5 100644
--- a/drivers/power/pmic/pmic_max77686.c
+++ b/drivers/power/pmic/pmic_max77686.c
@@ -30,6 +30,192 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+static const char max77686_buck_addr[] = {
+	0xff, 0x10, 0x12, 0x1c, 0x26, 0x30, 0x32, 0x34, 0x36, 0x38
+};
+
+static unsigned int max77686_ldo_volt2hex(int ldo, ulong uV)
+{
+	unsigned int hex = 0;
+	const unsigned int MAX_HEX = 0x3f;
+
+	switch (ldo) {
+	case 1:
+	case 2:
+	case 6:
+	case 7:
+	case 8:
+	case 15:
+		hex = (uV - 800000) / 25000;
+		break;
+	default:
+		hex = (uV - 800000) / 50000;
+	}
+
+	if (0 <= hex && hex <= MAX_HEX)
+		return hex;
+
+	printf("%s: %ld is wrong voltage value for LDO%d\n", __func__, uV, ldo);
+	return 0;
+}
+
+int max77686_set_ldo_voltage(struct pmic *p, int ldo, ulong uV)
+{
+	unsigned int val, ret, hex, adr, mask;
+
+	if (ldo < 1 && 26 < ldo) {
+		printf("%s: %d is wrong ldo number\n", __func__, ldo);
+		return -1;
+	}
+
+	adr = MAX77686_REG_PMIC_LDO1CTRL1 + ldo - 1;
+	mask = 0x3f;
+	hex = max77686_ldo_volt2hex(ldo, uV);
+
+	if (!hex)
+		return -1;
+
+	ret = pmic_reg_read(p, adr, &val);
+	val &= ~mask;
+	val |= hex;
+	ret |= pmic_reg_write(p, adr, val);
+
+	return ret;
+}
+
+int max77686_set_ldo_mode(struct pmic *p, int ldo, char opmode)
+{
+	unsigned int val, ret, mask, adr, mode;
+
+	if (ldo < 1 && 26 < ldo) {
+		printf("%s: %d is wrong ldo number\n", __func__, ldo);
+		return -1;
+	}
+
+	adr = MAX77686_REG_PMIC_LDO1CTRL1 + ldo - 1;
+
+	/* mask */
+	mask = 0xc0;
+
+	/* mode */
+	if (opmode == OPMODE_OFF) {
+		mode = 0x00;
+	} else if (opmode == OPMODE_STANDBY) {
+		switch (ldo) {
+		case 2:
+		case 6:
+		case 7:
+		case 8:
+		case 10:
+		case 11:
+		case 12:
+		case 14:
+		case 15:
+		case 16:
+			mode = 0x40;
+			break;
+		default:
+			mode = 0xff;
+		}
+	} else if (opmode == OPMODE_LPM) {
+		mode = 0x80;
+	} else if (opmode == OPMODE_ON) {
+		mode = 0xc0;
+	} else {
+		mode = 0xff;
+	}
+
+	if (mode == 0xff) {
+		printf("%s: %d is not supported on LDO%d\n",
+			__func__, opmode, ldo);
+		return -1;
+	}
+
+	ret = pmic_reg_read(p, adr, &val);
+	val &= ~mask;
+	val |= mode;
+	ret |= pmic_reg_write(p, adr, val);
+
+	return ret;
+}
+
+int max77686_set_buck_mode(struct pmic *p, int buck, char opmode)
+{
+	unsigned int val, ret, mask, adr, size, mode;
+
+	size = sizeof(max77686_buck_addr) / sizeof(*max77686_buck_addr);
+	if (buck >= size) {
+		printf("%s: %d is wrong buck number\n", __func__, buck);
+		return -1;
+	}
+
+	adr = max77686_buck_addr[buck];
+
+	/* mask */
+	switch (buck) {
+	case 2:
+	case 3:
+	case 4:
+		mask = 0x30;
+		break;
+	default:
+		mask = 0x03;
+	}
+
+	/* mode */
+	if (opmode == OPMODE_OFF) {
+		mode = 0x00;
+	} else if (opmode == OPMODE_STANDBY) {
+		switch (buck) {
+		case 1:
+			mode = 0x01;
+			break;
+		case 2:
+		case 3:
+		case 4:
+			mode = 0x10;
+			break;
+		default:
+			mode = 0xff;
+		}
+	} else if (opmode == OPMODE_LPM) {
+		switch (buck) {
+		case 2:
+		case 3:
+		case 4:
+			mode = 0x20;
+			break;
+		default:
+			mode = 0xff;
+		}
+	} else if (opmode == OPMODE_ON) {
+		switch (buck) {
+		case 2:
+		case 3:
+		case 4:
+			mode = 0x30;
+			break;
+		default:
+			mode = 0x03;
+		}
+	} else {
+		mode = 0xff;
+	}
+
+	if (mode == 0xff) {
+		printf("%s: %d is not supported on BUCK%d\n",
+			__func__, opmode, buck);
+		return -1;
+	}
+
+	ret = pmic_reg_read(p, adr, &val);
+	val &= ~mask;
+	val |= mode;
+	ret |= pmic_reg_write(p, adr, val);
+
+	return ret;
+}
+
 int pmic_init(unsigned char bus)
 {
 	static const char name[] = "MAX77686_PMIC";
diff --git a/include/power/max77686_pmic.h b/include/power/max77686_pmic.h
index d949ace..e1874ec 100644
--- a/include/power/max77686_pmic.h
+++ b/include/power/max77686_pmic.h
@@ -155,4 +155,15 @@ enum {
 	EN_LDO = (0x3 << 6),
 };
 
+enum {
+	OPMODE_OFF = 0,
+	OPMODE_STANDBY,
+	OPMODE_LPM,
+	OPMODE_ON,
+};
+
+int max77686_set_ldo_voltage(struct pmic *p, int ldo, ulong uV);
+int max77686_set_ldo_mode(struct pmic *p, int ldo, char opmode);
+int max77686_set_buck_mode(struct pmic *p, int buck, char opmode);
+
 #endif /* __MAX77686_PMIC_H_ */
-- 
1.7.9.5