sun6i: Add basic axp221 driver

The A31 uses the AXP221 pmic for various voltages.

Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
--
Changes in v2:
-Rebase
Changes in v3:
-Add support for all dldo and aldo-s
-Add Kconfig option to select building AXP221 and to select voltage of
 dldo and aldo-s
Changes in v4:
-Add axp221_setbits helper function
-Use symbolic names for enabled bits in CTRL1 - CTRL3 registers

1 files changed, 186 insertions, 0 deletions

diff --git a/drivers/power/axp221.c b/drivers/power/axp221.c
new file mode 100644
index 0000000000..941193a19d
--- /dev/null
+++ b/drivers/power/axp221.c
@@ -0,0 +1,186 @@
+/*
+ * (C) Copyright 2013 Oliver Schinagl <oliver@schinagl.nl>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <asm/arch/p2wi.h>
+#include <axp221.h>
+
+static u8 axp221_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;
+}
+
+static int axp221_setbits(u8 reg, u8 bits)
+{
+	int ret;
+	u8 val;
+
+	ret = p2wi_read(reg, &val);
+	if (ret)
+		return ret;
+
+	val |= bits;
+	return p2wi_write(reg, val);
+}
+
+int axp221_set_dcdc1(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 1600, 3400, 100);
+
+	ret = p2wi_write(AXP221_DCDC1_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return axp221_setbits(AXP221_OUTPUT_CTRL2,
+			      AXP221_OUTPUT_CTRL2_DCDC1_EN);
+}
+
+int axp221_set_dcdc2(unsigned int mvolt)
+{
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 600, 1540, 20);
+
+	return p2wi_write(AXP221_DCDC2_CTRL, cfg);
+}
+
+int axp221_set_dcdc3(unsigned int mvolt)
+{
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 600, 1860, 20);
+
+	return p2wi_write(AXP221_DCDC3_CTRL, cfg);
+}
+
+int axp221_set_dcdc4(unsigned int mvolt)
+{
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 600, 1540, 20);
+
+	return p2wi_write(AXP221_DCDC4_CTRL, cfg);
+}
+
+int axp221_set_dcdc5(unsigned int mvolt)
+{
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 1000, 2550, 50);
+
+	return p2wi_write(AXP221_DCDC5_CTRL, cfg);
+}
+
+int axp221_set_dldo1(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 700, 3300, 100);
+
+	ret = p2wi_write(AXP221_DLDO1_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return axp221_setbits(AXP221_OUTPUT_CTRL2,
+			      AXP221_OUTPUT_CTRL2_DLDO1_EN);
+}
+
+int axp221_set_dldo2(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 700, 3300, 100);
+
+	ret = p2wi_write(AXP221_DLDO2_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return axp221_setbits(AXP221_OUTPUT_CTRL2,
+			      AXP221_OUTPUT_CTRL2_DLDO2_EN);
+}
+
+int axp221_set_dldo3(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 700, 3300, 100);
+
+	ret = p2wi_write(AXP221_DLDO3_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return axp221_setbits(AXP221_OUTPUT_CTRL2,
+			      AXP221_OUTPUT_CTRL2_DLDO3_EN);
+}
+
+int axp221_set_dldo4(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 700, 3300, 100);
+
+	ret = p2wi_write(AXP221_DLDO4_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return axp221_setbits(AXP221_OUTPUT_CTRL2,
+			      AXP221_OUTPUT_CTRL2_DLDO4_EN);
+}
+
+int axp221_set_aldo1(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 700, 3300, 100);
+
+	ret = p2wi_write(AXP221_ALDO1_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return axp221_setbits(AXP221_OUTPUT_CTRL1,
+			      AXP221_OUTPUT_CTRL1_ALDO1_EN);
+}
+
+int axp221_set_aldo2(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 700, 3300, 100);
+
+	ret = p2wi_write(AXP221_ALDO2_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return axp221_setbits(AXP221_OUTPUT_CTRL1,
+			      AXP221_OUTPUT_CTRL1_ALDO2_EN);
+}
+
+int axp221_set_aldo3(unsigned int mvolt)
+{
+	int ret;
+	u8 cfg = axp221_mvolt_to_cfg(mvolt, 700, 3300, 100);
+
+	ret = p2wi_write(AXP221_ALDO3_CTRL, cfg);
+	if (ret)
+		return ret;
+
+	return axp221_setbits(AXP221_OUTPUT_CTRL3,
+			      AXP221_OUTPUT_CTRL3_ALDO3_EN);
+}
+
+int axp221_init(void)
+{
+	u8 axp_chip_id;
+	int ret;
+
+	p2wi_init();
+	ret = p2wi_change_to_p2wi_mode(AXP221_CHIP_ADDR, AXP221_CTRL_ADDR,
+				       AXP221_INIT_DATA);
+	if (ret)
+		return ret;
+
+	ret = p2wi_read(AXP221_CHIP_ID, &axp_chip_id);
+	if (ret)
+		return ret;
+
+	if (!(axp_chip_id == 0x6 || axp_chip_id == 0x7 || axp_chip_id == 0x17))
+		return -ENODEV;
+
+	return 0;
+}