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>

3 files changed, 162 insertions, 11 deletions

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 1936e5f1fc..e86dd72c14 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -9,6 +9,7 @@ choice
 	depends on ARCH_SUNXI
 	default AXP209_POWER if MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
 	default AXP221_POWER if MACH_SUN6I || MACH_SUN8I_A23 || MACH_SUN8I_A33
+	default AXP818_POWER if MACH_SUN8I_A83T
 	default SUNXI_NO_PMIC if MACH_SUN8I_H3
 
 config SUNXI_NO_PMIC
@@ -37,22 +38,32 @@ config AXP221_POWER
 	Select this to enable support for the axp221/axp223 pmic found on most
 	A23 and A31 boards.
 
+config AXP818_POWER
+	boolean "axp818 pmic support"
+	depends on MACH_SUN8I_A83T
+	---help---
+	Say y here to enable support for the axp818 pmic found on
+	A83T dev board.
+
 endchoice
 
 config AXP_DCDC1_VOLT
 	int "axp pmic dcdc1 voltage"
-	depends on AXP221_POWER
+	depends on AXP221_POWER || AXP818_POWER
+	default 3300 if AXP818_POWER
 	default 3000 if MACH_SUN6I || MACH_SUN8I
 	---help---
 	Set the voltage (mV) to program the axp pmic dcdc1 at, set to 0 to
 	disable dcdc1. On A23 / A31 / A33 (axp221) boards dcdc1 is used for
 	generic 3.3V IO voltage for external devices like the lcd-panal and
 	sdcard interfaces, etc. On most boards dcdc1 is undervolted to 3.0V to
-	safe battery. On A31 devices dcdc1 is also used for VCC-IO.
+	safe battery. On A31 devices dcdc1 is also used for VCC-IO. On A83T
+	dcdc1 is used for VCC-IO, nand, usb0, sd , etc.
 
 config AXP_DCDC2_VOLT
 	int "axp pmic dcdc2 voltage"
-	depends on AXP152_POWER || AXP209_POWER || AXP221_POWER
+	depends on AXP152_POWER || AXP209_POWER || AXP221_POWER || AXP818_POWER
+	default 900 if AXP818_POWER
 	default 1400 if AXP152_POWER || AXP209_POWER
 	default 1200 if MACH_SUN6I
 	default 1100 if MACH_SUN8I
@@ -62,10 +73,12 @@ config AXP_DCDC2_VOLT
 	On A10(s) / A13 / A20 boards dcdc2 is VDD-CPU and should be 1.4V.
 	On A31 boards dcdc2 is used for VDD-GPU and should be 1.2V.
 	On A23/A33 boards dcdc2 is used for VDD-SYS and should be 1.1V.
+	On A83T boards dcdc2 is used for VDD-CPUA(cluster 0) and should be 0.9V.
 
 config AXP_DCDC3_VOLT
 	int "axp pmic dcdc3 voltage"
-	depends on AXP152_POWER || AXP209_POWER || AXP221_POWER
+	depends on AXP152_POWER || AXP209_POWER || AXP221_POWER || AXP818_POWER
+	default 900 if AXP818_POWER
 	default 1500 if AXP152_POWER
 	default 1250 if AXP209_POWER
 	default 1200 if MACH_SUN6I || MACH_SUN8I
@@ -76,10 +89,11 @@ config AXP_DCDC3_VOLT
 	should be 1.25V.
 	On A10s boards with an axp152 dcdc3 is VCC-DRAM and should be 1.5V.
 	On A23 / A31 / A33 boards dcdc3 is VDD-CPU and should be 1.2V.
+	On A83T boards dcdc3 is used for VDD-CPUB(cluster 1) and should be 0.9V.
 
 config AXP_DCDC4_VOLT
 	int "axp pmic dcdc4 voltage"
-	depends on AXP152_POWER || AXP221_POWER
+	depends on AXP152_POWER || AXP221_POWER || AXP818_POWER
 	default 1250 if AXP152_POWER
 	default 1200 if MACH_SUN6I
 	default 0 if MACH_SUN8I
@@ -89,15 +103,18 @@ config AXP_DCDC4_VOLT
 	On A10s boards with an axp152 dcdc4 is VDD-INT-DLL and should be 1.25V.
 	On A31 boards dcdc4 is used for VDD-SYS and should be 1.2V.
 	On A23 / A33 boards dcdc4 is unused and should be disabled.
+	On A83T boards dcdc4 is used for VDD-GPU.
 
 config AXP_DCDC5_VOLT
 	int "axp pmic dcdc5 voltage"
-	depends on AXP221_POWER
+	depends on AXP221_POWER || AXP818_POWER
+	default 1800 if AXP818_POWER
 	default 1500 if MACH_SUN6I || MACH_SUN8I
 	---help---
 	Set the voltage (mV) to program the axp pmic dcdc5 at, set to 0 to
 	disable dcdc5.
-	On A23 / A31 / A33 boards dcdc5 is VCC-DRAM and should be 1.5V.
+	On A23 / A31 / A33 / A83T boards dcdc5 is VCC-DRAM and should be 1.5V,
+	1.8V for A83T.
 
 config AXP_ALDO1_VOLT
 	int "axp pmic (a)ldo1 voltage"
@@ -112,7 +129,7 @@ config AXP_ALDO1_VOLT
 
 config AXP_ALDO2_VOLT
 	int "axp pmic (a)ldo2 voltage"
-	depends on AXP152_POWER || AXP209_POWER || AXP221_POWER
+	depends on AXP152_POWER || AXP209_POWER || AXP221_POWER || AXP818_POWER
 	default 3000 if AXP152_POWER || AXP209_POWER
 	default 0 if MACH_SUN6I
 	default 2500 if MACH_SUN8I
@@ -126,14 +143,15 @@ config AXP_ALDO2_VOLT
 
 config AXP_ALDO3_VOLT
 	int "axp pmic (a)ldo3 voltage"
-	depends on AXP209_POWER || AXP221_POWER
-	default 0 if AXP209_POWER
+	depends on AXP209_POWER || AXP221_POWER || AXP818_POWER
+	default 0 if AXP209_POWER || AXP818_POWER
 	default 3000 if MACH_SUN6I || MACH_SUN8I
 	---help---
 	Set the voltage (mV) to program the axp pmic aldo3 at, set to 0 to
 	disable aldo3.
 	On A10(s) / A13 / A20 boards aldo3 should be 2.8V.
 	On A23 / A31 / A33 boards aldo3 is VCC-PLL and AVCC and should be 3.0V.
+	On A83T aldo3 is used for LVDS, DSI, MIPI, HDMI, etc.
 
 config AXP_ALDO4_VOLT
 	int "axp pmic (a)ldo4 voltage"
@@ -172,7 +190,7 @@ config AXP_DLDO3_VOLT
 
 config AXP_DLDO4_VOLT
 	int "axp pmic dldo4 voltage"
-	depends on AXP221_POWER
+	depends on AXP221_POWER || AXP818_POWER
 	default 0
 	---help---
 	Set the voltage (mV) to program the axp pmic dldo4 at, set to 0 to
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index a2d3c047db..0fdbca3c35 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_AS3722_POWER)	+= as3722.o
 obj-$(CONFIG_AXP152_POWER)	+= axp152.o
 obj-$(CONFIG_AXP209_POWER)	+= axp209.o
 obj-$(CONFIG_AXP221_POWER)	+= axp221.o
+obj-$(CONFIG_AXP818_POWER)	+= axp818.o
 obj-$(CONFIG_EXYNOS_TMU)	+= exynos-tmu.o
 obj-$(CONFIG_FTPMU010_POWER)	+= ftpmu010.o
 obj-$(CONFIG_TPS6586X_POWER)	+= tps6586x.o
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;
+}