sunxi: power: axp818: add support for axp818 driver

AXP818 is rsb based PMIC and used on Allwinner A83T H8 Homlet dev board.
It's registers are different and calculating reg config is different than
that of earlier axp power ICs.

DCDC1, DCDC2, DCDC3 and DCDC5 is implemented at the moment.
all other voltages can be added subsequently.
AXP datasheet is uploaded to wiki:
http://linux-sunxi.org/File:AXP818_datasheet_Revision1.0.pdf

Signed-off-by: Vishnu Patekar <vishnupatekar0510@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 132 insertions, 0 deletions

diff --git a/drivers/power/axp818.c b/drivers/power/axp818.c
new file mode 100644
index 0000000000..4b21a83879
--- /dev/null
+++ b/drivers/power/axp818.c
@@ -0,0 +1,132 @@
+/*
+ * AXP818 driver based on AXP221 driver
+ *
+ *
+ * (C) Copyright 2015 Vishnu Patekar <vishnuptekar0510@gmail.com>
+ *
+ * Based on axp221.c
+ * (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com>
+ * (C) Copyright 2013 Oliver Schinagl <oliver@schinagl.nl>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/pmic_bus.h>
+#include <axp_pmic.h>
+
+static u8 axp818_mvolt_to_cfg(int mvolt, int min, int max, int div)
+{
+	if (mvolt < min)
+		mvolt = min;
+	else if (mvolt > max)
+		mvolt = max;
+
+	return  (mvolt - min) / div;
+}
+
+int axp_set_dcdc1(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg = axp818_mvolt_to_cfg(mvolt, 1600, 3400, 100);
+
+	if (mvolt == 0)
+		return pmic_bus_clrbits(AXP818_OUTPUT_CTRL1,
+					AXP818_OUTPUT_CTRL1_DCDC1_EN);
+
+	ret = pmic_bus_write(AXP818_DCDC1_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return pmic_bus_setbits(AXP818_OUTPUT_CTRL1,
+				AXP818_OUTPUT_CTRL1_DCDC1_EN);
+}
+
+int axp_set_dcdc2(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg;
+
+	if (mvolt >= 1220)
+		cfg = 70 + axp818_mvolt_to_cfg(mvolt, 1220, 1300, 20);
+	else
+		cfg = axp818_mvolt_to_cfg(mvolt, 500, 1200, 10);
+
+	if (mvolt == 0)
+		return pmic_bus_clrbits(AXP818_OUTPUT_CTRL1,
+					AXP818_OUTPUT_CTRL1_DCDC2_EN);
+
+	ret = pmic_bus_write(AXP818_DCDC2_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return pmic_bus_setbits(AXP818_OUTPUT_CTRL1,
+				AXP818_OUTPUT_CTRL1_DCDC2_EN);
+}
+
+int axp_set_dcdc3(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg;
+
+	if (mvolt >= 1220)
+		cfg = 70 + axp818_mvolt_to_cfg(mvolt, 1220, 1300, 20);
+	else
+		cfg = axp818_mvolt_to_cfg(mvolt, 500, 1200, 10);
+
+	if (mvolt == 0)
+		return pmic_bus_clrbits(AXP818_OUTPUT_CTRL1,
+					AXP818_OUTPUT_CTRL1_DCDC3_EN);
+
+	ret = pmic_bus_write(AXP818_DCDC3_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return pmic_bus_setbits(AXP818_OUTPUT_CTRL1,
+				AXP818_OUTPUT_CTRL1_DCDC3_EN);
+}
+
+int axp_set_dcdc5(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg;
+
+	if (mvolt >= 1140)
+		cfg = 32 + axp818_mvolt_to_cfg(mvolt, 1140, 1840, 20);
+	else
+		cfg = axp818_mvolt_to_cfg(mvolt, 800, 1120, 10);
+
+	if (mvolt == 0)
+		return pmic_bus_clrbits(AXP818_OUTPUT_CTRL1,
+					AXP818_OUTPUT_CTRL1_DCDC5_EN);
+
+	ret = pmic_bus_write(AXP818_DCDC5_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return pmic_bus_setbits(AXP818_OUTPUT_CTRL1,
+				AXP818_OUTPUT_CTRL1_DCDC5_EN);
+}
+
+int axp_init(void)
+{
+	u8 axp_chip_id;
+	int ret;
+
+	ret = pmic_bus_init();
+	if (ret)
+		return ret;
+
+	ret = pmic_bus_read(AXP818_CHIP_ID, &axp_chip_id);
+	if (ret)
+		return ret;
+
+	if (!(axp_chip_id == 0x51))
+		return -ENODEV;
+	else
+		return ret;
+
+	return 0;
+}