regulator: Add support for S2MPA01 regulator

Add support for S2MPA01 voltage and current regulator.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 489 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 6a7932822e37..8f8e6710bb45 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -416,6 +416,13 @@ config REGULATOR_RC5T583
           through regulator interface. The device supports multiple DCDC/LDO
           outputs which can be controlled by i2c communication.
 
+config REGULATOR_S2MPA01
+        tristate "Samsung S2MPA01 voltage regulator"
+        depends on MFD_SEC_CORE
+        help
+         This driver controls Samsung S2MPA01 voltage output regulator
+         via I2C bus. S2MPA01 has 10 Bucks and 26 LDO outputs.
+
 config REGULATOR_S2MPS11
         tristate "Samsung S2MPS11 voltage regulator"
         depends on MFD_SEC_CORE
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 979f9ddcf259..b3ece84289cf 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_REGULATOR_TPS51632) += tps51632-regulator.o
 obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
 obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
 obj-$(CONFIG_REGULATOR_RC5T583)  += rc5t583-regulator.o
+obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o
 obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
 obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
diff --git a/drivers/regulator/s2mpa01.c b/drivers/regulator/s2mpa01.c
new file mode 100644
index 000000000000..808b3aa7a42c
--- /dev/null
+++ b/drivers/regulator/s2mpa01.c
@@ -0,0 +1,481 @@
+/*
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd
+ *              http://www.samsung.com
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/bug.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/mfd/samsung/core.h>
+#include <linux/mfd/samsung/s2mpa01.h>
+
+#define S2MPA01_REGULATOR_CNT ARRAY_SIZE(regulators)
+
+struct s2mpa01_info {
+        int ramp_delay24;
+        int ramp_delay3;
+        int ramp_delay5;
+        int ramp_delay16;
+        int ramp_delay7;
+        int ramp_delay8910;
+};
+
+static int get_ramp_delay(int ramp_delay)
+{
+        unsigned char cnt = 0;
+
+        ramp_delay /= 6250;
+
+        while (true) {
+                ramp_delay = ramp_delay >> 1;
+                if (ramp_delay == 0)
+                        break;
+                cnt++;
+        }
+
+        if (cnt > 3)
+                cnt = 3;
+
+        return cnt;
+}
+
+static int s2mpa01_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
+                                   unsigned int old_selector,
+                                   unsigned int new_selector)
+{
+        struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
+        unsigned int ramp_delay = 0;
+        int old_volt, new_volt;
+
+        switch (rdev->desc->id) {
+        case S2MPA01_BUCK2:
+        case S2MPA01_BUCK4:
+                ramp_delay = s2mpa01->ramp_delay24;
+                break;
+        case S2MPA01_BUCK3:
+                ramp_delay = s2mpa01->ramp_delay3;
+                break;
+        case S2MPA01_BUCK5:
+                ramp_delay = s2mpa01->ramp_delay5;
+                break;
+        case S2MPA01_BUCK1:
+        case S2MPA01_BUCK6:
+                ramp_delay = s2mpa01->ramp_delay16;
+                break;
+        case S2MPA01_BUCK7:
+                ramp_delay = s2mpa01->ramp_delay7;
+                break;
+        case S2MPA01_BUCK8:
+        case S2MPA01_BUCK9:
+        case S2MPA01_BUCK10:
+                ramp_delay = s2mpa01->ramp_delay8910;
+                break;
+        }
+
+        if (ramp_delay == 0)
+                ramp_delay = rdev->desc->ramp_delay;
+
+        old_volt = rdev->desc->min_uV + (rdev->desc->uV_step * old_selector);
+        new_volt = rdev->desc->min_uV + (rdev->desc->uV_step * new_selector);
+
+        return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
+}
+
+static int s2mpa01_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
+{
+        struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
+        unsigned int ramp_val, ramp_shift, ramp_reg = S2MPA01_REG_RAMP2;
+        unsigned int ramp_enable = 1, enable_shift = 0;
+        int ret;
+
+        switch (rdev->desc->id) {
+        case S2MPA01_BUCK1:
+                enable_shift = S2MPA01_BUCK1_RAMP_EN_SHIFT;
+                if (!ramp_delay) {
+                        ramp_enable = 0;
+                        break;
+                }
+
+                if (ramp_delay > s2mpa01->ramp_delay16)
+                        s2mpa01->ramp_delay16 = ramp_delay;
+                else
+                        ramp_delay = s2mpa01->ramp_delay16;
+
+                ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
+                ramp_reg = S2MPA01_REG_RAMP1;
+                break;
+        case S2MPA01_BUCK2:
+                enable_shift = S2MPA01_BUCK2_RAMP_EN_SHIFT;
+                if (!ramp_delay) {
+                        ramp_enable = 0;
+                        break;
+                }
+
+                if (ramp_delay > s2mpa01->ramp_delay24)
+                        s2mpa01->ramp_delay24 = ramp_delay;
+                else
+                        ramp_delay = s2mpa01->ramp_delay24;
+
+                ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
+                ramp_reg = S2MPA01_REG_RAMP1;
+                break;
+        case S2MPA01_BUCK3:
+                enable_shift = S2MPA01_BUCK3_RAMP_EN_SHIFT;
+                if (!ramp_delay) {
+                        ramp_enable = 0;
+                        break;
+                }
+
+                s2mpa01->ramp_delay3 = ramp_delay;
+                ramp_shift = S2MPA01_BUCK3_RAMP_SHIFT;
+                ramp_reg = S2MPA01_REG_RAMP1;
+                break;
+        case S2MPA01_BUCK4:
+                enable_shift = S2MPA01_BUCK4_RAMP_EN_SHIFT;
+                if (!ramp_delay) {
+                        ramp_enable = 0;
+                        break;
+                }
+
+                if (ramp_delay > s2mpa01->ramp_delay24)
+                        s2mpa01->ramp_delay24 = ramp_delay;
+                else
+                        ramp_delay = s2mpa01->ramp_delay24;
+
+                ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
+                ramp_reg = S2MPA01_REG_RAMP1;
+                break;
+        case S2MPA01_BUCK5:
+                s2mpa01->ramp_delay5 = ramp_delay;
+                ramp_shift = S2MPA01_BUCK5_RAMP_SHIFT;
+                break;
+        case S2MPA01_BUCK6:
+                if (ramp_delay > s2mpa01->ramp_delay16)
+                        s2mpa01->ramp_delay16 = ramp_delay;
+                else
+                        ramp_delay = s2mpa01->ramp_delay16;
+
+                ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
+                break;
+        case S2MPA01_BUCK7:
+                s2mpa01->ramp_delay7 = ramp_delay;
+                ramp_shift = S2MPA01_BUCK7_RAMP_SHIFT;
+                break;
+        case S2MPA01_BUCK8:
+        case S2MPA01_BUCK9:
+        case S2MPA01_BUCK10:
+                if (ramp_delay > s2mpa01->ramp_delay8910)
+                        s2mpa01->ramp_delay8910 = ramp_delay;
+                else
+                        ramp_delay = s2mpa01->ramp_delay8910;
+
+                ramp_shift = S2MPA01_BUCK8910_RAMP_SHIFT;
+                break;
+        default:
+                return 0;
+        }
+
+        if (!ramp_enable)
+                goto ramp_disable;
+
+        if (enable_shift) {
+                ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
+                                        1 << enable_shift, 1 << enable_shift);
+                if (ret) {
+                        dev_err(&rdev->dev, "failed to enable ramp rate\n");
+                        return ret;
+                }
+        }
+
+        ramp_val = get_ramp_delay(ramp_delay);
+
+        return regmap_update_bits(rdev->regmap, ramp_reg, 0x3 << ramp_shift,
+                                  ramp_val << ramp_shift);
+
+ramp_disable:
+        return regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
+                                  1 << enable_shift, 0);
+}
+
+static struct regulator_ops s2mpa01_ldo_ops = {
+        .list_voltage           = regulator_list_voltage_linear,
+        .map_voltage            = regulator_map_voltage_linear,
+        .is_enabled             = regulator_is_enabled_regmap,
+        .enable                 = regulator_enable_regmap,
+        .disable                = regulator_disable_regmap,
+        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
+        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
+        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
+};
+
+static struct regulator_ops s2mpa01_buck_ops = {
+        .list_voltage           = regulator_list_voltage_linear,
+        .map_voltage            = regulator_map_voltage_linear,
+        .is_enabled             = regulator_is_enabled_regmap,
+        .enable                 = regulator_enable_regmap,
+        .disable                = regulator_disable_regmap,
+        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
+        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
+        .set_voltage_time_sel   = s2mpa01_regulator_set_voltage_time_sel,
+        .set_ramp_delay         = s2mpa01_set_ramp_delay,
+};
+
+#define regulator_desc_ldo1(num)        {               \
+        .name           = "LDO"#num,                    \
+        .id             = S2MPA01_LDO##num,             \
+        .ops            = &s2mpa01_ldo_ops,             \
+        .type           = REGULATOR_VOLTAGE,            \
+        .owner          = THIS_MODULE,                  \
+        .min_uV         = S2MPA01_LDO_MIN,              \
+        .uV_step        = S2MPA01_LDO_STEP1,            \
+        .n_voltages     = S2MPA01_LDO_N_VOLTAGES,       \
+        .vsel_reg       = S2MPA01_REG_L1CTRL + num - 1, \
+        .vsel_mask      = S2MPA01_LDO_VSEL_MASK,        \
+        .enable_reg     = S2MPA01_REG_L1CTRL + num - 1, \
+        .enable_mask    = S2MPA01_ENABLE_MASK           \
+}
+#define regulator_desc_ldo2(num)        {               \
+        .name           = "LDO"#num,                    \
+        .id             = S2MPA01_LDO##num,             \
+        .ops            = &s2mpa01_ldo_ops,             \
+        .type           = REGULATOR_VOLTAGE,            \
+        .owner          = THIS_MODULE,                  \
+        .min_uV         = S2MPA01_LDO_MIN,              \
+        .uV_step        = S2MPA01_LDO_STEP2,            \
+        .n_voltages     = S2MPA01_LDO_N_VOLTAGES,       \
+        .vsel_reg       = S2MPA01_REG_L1CTRL + num - 1, \
+        .vsel_mask      = S2MPA01_LDO_VSEL_MASK,        \
+        .enable_reg     = S2MPA01_REG_L1CTRL + num - 1, \
+        .enable_mask    = S2MPA01_ENABLE_MASK           \
+}
+
+#define regulator_desc_buck1_4(num)     {                       \
+        .name           = "BUCK"#num,                           \
+        .id             = S2MPA01_BUCK##num,                    \
+        .ops            = &s2mpa01_buck_ops,                    \
+        .type           = REGULATOR_VOLTAGE,                    \
+        .owner          = THIS_MODULE,                          \
+        .min_uV         = S2MPA01_BUCK_MIN1,                    \
+        .uV_step        = S2MPA01_BUCK_STEP1,                   \
+        .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
+        .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
+        .vsel_reg       = S2MPA01_REG_B1CTRL2 + (num - 1) * 2,  \
+        .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
+        .enable_reg     = S2MPA01_REG_B1CTRL1 + (num - 1) * 2,  \
+        .enable_mask    = S2MPA01_ENABLE_MASK                   \
+}
+
+#define regulator_desc_buck5    {                               \
+        .name           = "BUCK5",                              \
+        .id             = S2MPA01_BUCK5,                        \
+        .ops            = &s2mpa01_buck_ops,                    \
+        .type           = REGULATOR_VOLTAGE,                    \
+        .owner          = THIS_MODULE,                          \
+        .min_uV         = S2MPA01_BUCK_MIN2,                    \
+        .uV_step        = S2MPA01_BUCK_STEP1,                   \
+        .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
+        .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
+        .vsel_reg       = S2MPA01_REG_B5CTRL2,                  \
+        .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
+        .enable_reg     = S2MPA01_REG_B5CTRL1,                  \
+        .enable_mask    = S2MPA01_ENABLE_MASK                   \
+}
+
+#define regulator_desc_buck6_7(num)     {                       \
+        .name           = "BUCK"#num,                           \
+        .id             = S2MPA01_BUCK##num,                    \
+        .ops            = &s2mpa01_buck_ops,                    \
+        .type           = REGULATOR_VOLTAGE,                    \
+        .owner          = THIS_MODULE,                          \
+        .min_uV         = S2MPA01_BUCK_MIN1,                    \
+        .uV_step        = S2MPA01_BUCK_STEP1,                   \
+        .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
+        .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
+        .vsel_reg       = S2MPA01_REG_B6CTRL2 + (num - 6) * 2,  \
+        .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
+        .enable_reg     = S2MPA01_REG_B6CTRL1 + (num - 6) * 2,  \
+        .enable_mask    = S2MPA01_ENABLE_MASK                   \
+}
+
+#define regulator_desc_buck8    {                               \
+        .name           = "BUCK8",                              \
+        .id             = S2MPA01_BUCK8,                        \
+        .ops            = &s2mpa01_buck_ops,                    \
+        .type           = REGULATOR_VOLTAGE,                    \
+        .owner          = THIS_MODULE,                          \
+        .min_uV         = S2MPA01_BUCK_MIN2,                    \
+        .uV_step        = S2MPA01_BUCK_STEP2,                   \
+        .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
+        .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
+        .vsel_reg       = S2MPA01_REG_B8CTRL2,                  \
+        .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
+        .enable_reg     = S2MPA01_REG_B8CTRL1,                  \
+        .enable_mask    = S2MPA01_ENABLE_MASK                   \
+}
+
+#define regulator_desc_buck9    {                               \
+        .name           = "BUCK9",                              \
+        .id             = S2MPA01_BUCK9,                        \
+        .ops            = &s2mpa01_buck_ops,                    \
+        .type           = REGULATOR_VOLTAGE,                    \
+        .owner          = THIS_MODULE,                          \
+        .min_uV         = S2MPA01_BUCK_MIN4,                    \
+        .uV_step        = S2MPA01_BUCK_STEP2,                   \
+        .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
+        .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
+        .vsel_reg       = S2MPA01_REG_B9CTRL2,                  \
+        .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
+        .enable_reg     = S2MPA01_REG_B9CTRL1,                  \
+        .enable_mask    = S2MPA01_ENABLE_MASK                   \
+}
+
+#define regulator_desc_buck10   {                               \
+        .name           = "BUCK10",                             \
+        .id             = S2MPA01_BUCK10,                       \
+        .ops            = &s2mpa01_buck_ops,                    \
+        .type           = REGULATOR_VOLTAGE,                    \
+        .owner          = THIS_MODULE,                          \
+        .min_uV         = S2MPA01_BUCK_MIN3,                    \
+        .uV_step        = S2MPA01_BUCK_STEP2,                   \
+        .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
+        .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
+        .vsel_reg       = S2MPA01_REG_B10CTRL2,                 \
+        .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
+        .enable_reg     = S2MPA01_REG_B10CTRL1,                 \
+        .enable_mask    = S2MPA01_ENABLE_MASK                   \
+}
+
+static struct regulator_desc regulators[] = {
+        regulator_desc_ldo2(1),
+        regulator_desc_ldo1(2),
+        regulator_desc_ldo1(3),
+        regulator_desc_ldo1(4),
+        regulator_desc_ldo1(5),
+        regulator_desc_ldo2(6),
+        regulator_desc_ldo1(7),
+        regulator_desc_ldo1(8),
+        regulator_desc_ldo1(9),
+        regulator_desc_ldo1(10),
+        regulator_desc_ldo2(11),
+        regulator_desc_ldo1(12),
+        regulator_desc_ldo1(13),
+        regulator_desc_ldo1(14),
+        regulator_desc_ldo1(15),
+        regulator_desc_ldo1(16),
+        regulator_desc_ldo1(17),
+        regulator_desc_ldo1(18),
+        regulator_desc_ldo1(19),
+        regulator_desc_ldo1(20),
+        regulator_desc_ldo1(21),
+        regulator_desc_ldo2(22),
+        regulator_desc_ldo2(23),
+        regulator_desc_ldo1(24),
+        regulator_desc_ldo1(25),
+        regulator_desc_ldo1(26),
+        regulator_desc_buck1_4(1),
+        regulator_desc_buck1_4(2),
+        regulator_desc_buck1_4(3),
+        regulator_desc_buck1_4(4),
+        regulator_desc_buck5,
+        regulator_desc_buck6_7(6),
+        regulator_desc_buck6_7(7),
+        regulator_desc_buck8,
+        regulator_desc_buck9,
+        regulator_desc_buck10,
+};
+
+static int s2mpa01_pmic_probe(struct platform_device *pdev)
+{
+        struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+        struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
+        struct of_regulator_match rdata[S2MPA01_REGULATOR_MAX];
+        struct device_node *reg_np = NULL;
+        struct regulator_config config = { };
+        struct s2mpa01_info *s2mpa01;
+        int i;
+
+        s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
+        if (!s2mpa01)
+                return -ENOMEM;
+
+        for (i = 0; i < S2MPA01_REGULATOR_CNT; i++)
+                rdata[i].name = regulators[i].name;
+
+        if (iodev->dev->of_node) {
+                reg_np = of_get_child_by_name(iodev->dev->of_node,
+                                                        "regulators");
+                        if (!reg_np) {
+                                dev_err(&pdev->dev,
+                                        "could not find regulators sub-node\n");
+                                return -EINVAL;
+                        }
+
+                of_regulator_match(&pdev->dev, reg_np, rdata,
+                                                S2MPA01_REGULATOR_MAX);
+                of_node_put(reg_np);
+        }
+
+        platform_set_drvdata(pdev, s2mpa01);
+
+        config.dev = &pdev->dev;
+        config.regmap = iodev->regmap_pmic;
+        config.driver_data = s2mpa01;
+
+        for (i = 0; i < S2MPA01_REGULATOR_MAX; i++) {
+                struct regulator_dev *rdev;
+                if (pdata)
+                        config.init_data = pdata->regulators[i].initdata;
+                else
+                        config.init_data = rdata[i].init_data;
+
+                if (reg_np)
+                        config.of_node = rdata[i].of_node;
+
+                rdev = devm_regulator_register(&pdev->dev,
+                                                &regulators[i], &config);
+                if (IS_ERR(rdev)) {
+                        dev_err(&pdev->dev, "regulator init failed for %d\n",
+                                i);
+                        return PTR_ERR(rdev);
+                }
+        }
+
+        return 0;
+}
+
+static const struct platform_device_id s2mpa01_pmic_id[] = {
+        { "s2mpa01-pmic", 0},
+        { },
+};
+MODULE_DEVICE_TABLE(platform, s2mpa01_pmic_id);
+
+static struct platform_driver s2mpa01_pmic_driver = {
+        .driver = {
+                .name = "s2mpa01-pmic",
+                .owner = THIS_MODULE,
+        },
+        .probe = s2mpa01_pmic_probe,
+        .id_table = s2mpa01_pmic_id,
+};
+
+module_platform_driver(s2mpa01_pmic_driver);
+
+/* Module information */
+MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
+MODULE_AUTHOR("Sachin Kamat <sachin.kamat@samsung.com>");
+MODULE_DESCRIPTION("SAMSUNG S2MPA01 Regulator Driver");
+MODULE_LICENSE("GPL");