power: Add support for RK808 regulators

Add regulator support for the RK808 PMIC. It integrated 4 BUCKs and 8 LDOs
all of which are supported by this driver.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/power/regulator/Kconfig

@@ -49,6 +49,15 @@ config DM_REGULATOR_FIXED
 	features for fixed value regulators. The driver implements get/set api
 	for enable and get only for voltage value.
 
+config REGULATOR_RK808
+	bool "Enable driver for RK808 regulators"
+	depends on DM_REGULATOR && PMIC_RK808
+	---help---
+	Enable support for the regulator functions of the RK808 PMIC. The
+	driver implements get/set api for the various BUCKS and LDOs supported
+	by the PMIC device. This driver is controlled by a device tree node
+	which includes voltage limits.
+
 config REGULATOR_S5M8767
 	bool "Enable support for S5M8767 regulator"
 	depends on DM_REGULATOR && PMIC_S5M8767

drivers/power/regulator/Makefile

@@ -10,6 +10,7 @@ obj-$(CONFIG_REGULATOR_ACT8846) += act8846.o
 obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
 obj-$(CONFIG_DM_REGULATOR_PFUZE100) += pfuze100.o
 obj-$(CONFIG_DM_REGULATOR_FIXED) += fixed.o
+obj-$(CONFIG_REGULATOR_RK808) += rk808.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_DM_REGULATOR_SANDBOX) += sandbox.o
 obj-$(CONFIG_REGULATOR_TPS65090) += tps65090_regulator.o

drivers/power/regulator/rk808.c

@@ -0,0 +1,301 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * Based on Rockchip's drivers/power/pmic/pmic_rk808.c:
+ * Copyright (C) 2012 rockchips
+ * zyw <zyw@rock-chips.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <power/rk808_pmic.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+
+#ifndef CONFIG_SPL_BUILD
+#define ENABLE_DRIVER
+#endif
+
+struct rk808_reg_info {
+	uint min_uv;
+	uint step_uv;
+	s8 vsel_reg;
+	u8 vsel_bits;
+};
+
+static const struct rk808_reg_info rk808_buck[] = {
+	{ 712500, 12500, REG_BUCK1_ON_VSEL, 6, },
+	{ 712500, 12500, REG_BUCK2_ON_VSEL, 6, },
+	{ 712500, 12500, -1, 6, },
+	{ 1800000, 100000, REG_BUCK4_ON_VSEL, 4, },
+};
+
+static const struct rk808_reg_info rk808_ldo[] = {
+	{ 1800000, 100000, LDO1_ON_VSEL, 5, },
+	{ 1800000, 100000, LDO2_ON_VSEL, 5, },
+	{ 800000, 100000, LDO3_ON_VSEL, 4, },
+	{ 1800000, 100000, LDO4_ON_VSEL, 5, },
+	{ 1800000, 100000, LDO5_ON_VSEL, 5, },
+	{ 800000, 100000, LDO6_ON_VSEL, 5, },
+	{ 800000, 100000, LDO7_ON_VSEL, 5, },
+	{ 1800000, 100000, LDO8_ON_VSEL, 5, },
+};
+
+
+static int _buck_set_value(struct udevice *pmic, int buck, int uvolt)
+{
+	const struct rk808_reg_info *info = &rk808_buck[buck - 1];
+	int mask = (1 << info->vsel_bits) - 1;
+	int val;
+
+	if (info->vsel_reg == -1)
+		return -ENOSYS;
+	val = (uvolt - info->min_uv) / info->step_uv;
+	debug("%s: reg=%x, mask=%x, val=%x\n", __func__, info->vsel_reg, mask,
+	      val);
+
+	return pmic_clrsetbits(pmic, info->vsel_reg, mask, val);
+}
+
+static int _buck_set_enable(struct udevice *pmic, int buck, bool enable)
+{
+	uint mask;
+	int ret;
+
+	buck--;
+	mask = 1 << buck;
+	if (enable) {
+		ret = pmic_clrsetbits(pmic, DCDC_ILMAX, 0, 3 << (buck * 2));
+		if (ret)
+			return ret;
+		ret = pmic_clrsetbits(pmic, REG_DCDC_UV_ACT, 1 << buck, 0);
+		if (ret)
+			return ret;
+	}
+
+	return pmic_clrsetbits(pmic, REG_DCDC_EN, mask, enable ? mask : 0);
+}
+
+#ifdef ENABLE_DRIVER
+static int buck_get_value(struct udevice *dev)
+{
+	int buck = dev->driver_data - 1;
+	const struct rk808_reg_info *info = &rk808_buck[buck];
+	int mask = (1 << info->vsel_bits) - 1;
+	int ret, val;
+
+	if (info->vsel_reg == -1)
+		return -ENOSYS;
+	ret = pmic_reg_read(dev->parent, info->vsel_reg);
+	if (ret < 0)
+		return ret;
+	val = ret & mask;
+
+	return info->min_uv + val * info->step_uv;
+}
+
+static int buck_set_value(struct udevice *dev, int uvolt)
+{
+	int buck = dev->driver_data;
+
+	return _buck_set_value(dev->parent, buck, uvolt);
+}
+
+static int buck_set_enable(struct udevice *dev, bool enable)
+{
+	int buck = dev->driver_data;
+
+	return _buck_set_enable(dev->parent, buck, enable);
+}
+
+static bool buck_get_enable(struct udevice *dev)
+{
+	int buck = dev->driver_data - 1;
+	int ret;
+	uint mask;
+
+	mask = 1 << buck;
+
+	ret = pmic_reg_read(dev->parent, REG_DCDC_EN);
+	if (ret < 0)
+		return ret;
+
+	return ret & mask ? true : false;
+}
+
+static int ldo_get_value(struct udevice *dev)
+{
+	int ldo = dev->driver_data - 1;
+	const struct rk808_reg_info *info = &rk808_ldo[ldo];
+	int mask = (1 << info->vsel_bits) - 1;
+	int ret, val;
+
+	if (info->vsel_reg == -1)
+		return -ENOSYS;
+	ret = pmic_reg_read(dev->parent, info->vsel_reg);
+	if (ret < 0)
+		return ret;
+	val = ret & mask;
+
+	return info->min_uv + val * info->step_uv;
+}
+
+static int ldo_set_value(struct udevice *dev, int uvolt)
+{
+	int ldo = dev->driver_data - 1;
+	const struct rk808_reg_info *info = &rk808_ldo[ldo];
+	int mask = (1 << info->vsel_bits) - 1;
+	int val;
+
+	if (info->vsel_reg == -1)
+		return -ENOSYS;
+	val = (uvolt - info->min_uv) / info->step_uv;
+	debug("%s: reg=%x, mask=%x, val=%x\n", __func__, info->vsel_reg, mask,
+	      val);
+
+	return pmic_clrsetbits(dev->parent, info->vsel_reg, mask, val);
+}
+
+static int ldo_set_enable(struct udevice *dev, bool enable)
+{
+	int ldo = dev->driver_data - 1;
+	uint mask;
+
+	mask = 1 << ldo;
+
+	return pmic_clrsetbits(dev->parent, REG_LDO_EN, mask,
+			       enable ? mask : 0);
+}
+
+static bool ldo_get_enable(struct udevice *dev)
+{
+	int ldo = dev->driver_data - 1;
+	int ret;
+	uint mask;
+
+	mask = 1 << ldo;
+
+	ret = pmic_reg_read(dev->parent, REG_LDO_EN);
+	if (ret < 0)
+		return ret;
+
+	return ret & mask ? true : false;
+}
+
+static int switch_set_enable(struct udevice *dev, bool enable)
+{
+	int sw = dev->driver_data - 1;
+	uint mask;
+
+	mask = 1 << (sw + 5);
+
+	return pmic_clrsetbits(dev->parent, REG_DCDC_EN, mask,
+			       enable ? mask : 0);
+}
+
+static bool switch_get_enable(struct udevice *dev)
+{
+	int sw = dev->driver_data - 1;
+	int ret;
+	uint mask;
+
+	mask = 1 << (sw + 5);
+
+	ret = pmic_reg_read(dev->parent, REG_DCDC_EN);
+	if (ret < 0)
+		return ret;
+
+	return ret & mask ? true : false;
+}
+
+static int rk808_buck_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_BUCK;
+	uc_pdata->mode_count = 0;
+
+	return 0;
+}
+
+static int rk808_ldo_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_LDO;
+	uc_pdata->mode_count = 0;
+
+	return 0;
+}
+
+static int rk808_switch_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_FIXED;
+	uc_pdata->mode_count = 0;
+
+	return 0;
+}
+
+static const struct dm_regulator_ops rk808_buck_ops = {
+	.get_value  = buck_get_value,
+	.set_value  = buck_set_value,
+	.get_enable = buck_get_enable,
+	.set_enable = buck_set_enable,
+};
+
+static const struct dm_regulator_ops rk808_ldo_ops = {
+	.get_value  = ldo_get_value,
+	.set_value  = ldo_set_value,
+	.get_enable = ldo_get_enable,
+	.set_enable = ldo_set_enable,
+};
+
+static const struct dm_regulator_ops rk808_switch_ops = {
+	.get_enable = switch_get_enable,
+	.set_enable = switch_set_enable,
+};
+
+U_BOOT_DRIVER(rk808_buck) = {
+	.name = "rk808_buck",
+	.id = UCLASS_REGULATOR,
+	.ops = &rk808_buck_ops,
+	.probe = rk808_buck_probe,
+};
+
+U_BOOT_DRIVER(rk808_ldo) = {
+	.name = "rk808_ldo",
+	.id = UCLASS_REGULATOR,
+	.ops = &rk808_ldo_ops,
+	.probe = rk808_ldo_probe,
+};
+
+U_BOOT_DRIVER(rk808_switch) = {
+	.name = "rk808_switch",
+	.id = UCLASS_REGULATOR,
+	.ops = &rk808_switch_ops,
+	.probe = rk808_switch_probe,
+};
+#endif
+
+int rk808_spl_configure_buck(struct udevice *pmic, int buck, int uvolt)
+{
+	int ret;
+
+	ret = _buck_set_value(pmic, buck, uvolt);
+	if (ret)
+		return ret;
+
+	return _buck_set_enable(pmic, buck, true);
+}