regulator: add bcm590xx regulator driver

Add a regulator driver for the BCM590xx PMU voltage regulators.
The driver supports LDOs and DCDCs in normal mode only. There is
no support for low-power mode or power sequencing.

Signed-off-by: Matt Porter <mporter@linaro.org>
Reviewed-by: Tim Kryger <tim.kryger@linaro.org>
Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

3 files changed, 422 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 6a7932822e37..1169a42519d5 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -139,6 +139,14 @@ config REGULATOR_AS3722
           AS3722 PMIC. This will enable support for all the software
           controllable DCDC/LDO regulators.
 
+config REGULATOR_BCM590XX
+        tristate "Broadcom BCM590xx PMU Regulators"
+        depends on MFD_BCM590XX
+        help
+          This driver provides support for the voltage regulators on the
+          BCM590xx PMUs. This will enable support for the software
+          controllable LDO/Switching regulators.
+
 config REGULATOR_DA903X
         tristate "Dialog Semiconductor DA9030/DA9034 regulators"
         depends on PMIC_DA903X
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 979f9ddcf259..e1ab514f03c5 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o
 obj-$(CONFIG_REGULATOR_ARIZONA) += arizona-micsupp.o arizona-ldo1.o
 obj-$(CONFIG_REGULATOR_AS3711) += as3711-regulator.o
 obj-$(CONFIG_REGULATOR_AS3722) += as3722-regulator.o
+obj-$(CONFIG_REGULATOR_BCM590XX) += bcm590xx-regulator.o
 obj-$(CONFIG_REGULATOR_DA903X)  += da903x.o
 obj-$(CONFIG_REGULATOR_DA9052)  += da9052-regulator.o
 obj-$(CONFIG_REGULATOR_DA9055)  += da9055-regulator.o
diff --git a/drivers/regulator/bcm590xx-regulator.c b/drivers/regulator/bcm590xx-regulator.c
new file mode 100644
index 000000000000..e6b2e8e08c41
--- /dev/null
+++ b/drivers/regulator/bcm590xx-regulator.c
@@ -0,0 +1,413 @@
+/*
+ * Broadcom BCM590xx regulator driver
+ *
+ * Copyright 2014 Linaro Limited
+ * Author: Matt Porter <mporter@linaro.org>
+ *
+ * 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/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mfd/bcm590xx.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/slab.h>
+
+/* Register defs */
+#define BCM590XX_RFLDOPMCTRL1   0x60
+#define BCM590XX_IOSR1PMCTRL1   0x7a
+#define BCM590XX_IOSR2PMCTRL1   0x7c
+#define BCM590XX_CSRPMCTRL1     0x7e
+#define BCM590XX_SDSR1PMCTRL1   0x82
+#define BCM590XX_SDSR2PMCTRL1   0x86
+#define BCM590XX_MSRPMCTRL1     0x8a
+#define BCM590XX_VSRPMCTRL1     0x8e
+#define BCM590XX_REG_ENABLE     BIT(7)
+
+#define BCM590XX_RFLDOCTRL      0x96
+#define BCM590XX_CSRVOUT1       0xc0
+#define BCM590XX_LDO_VSEL_MASK  GENMASK(5, 3)
+#define BCM590XX_SR_VSEL_MASK   GENMASK(5, 0)
+
+/* LDO regulator IDs */
+#define BCM590XX_REG_RFLDO      0
+#define BCM590XX_REG_CAMLDO1    1
+#define BCM590XX_REG_CAMLDO2    2
+#define BCM590XX_REG_SIMLDO1    3
+#define BCM590XX_REG_SIMLDO2    4
+#define BCM590XX_REG_SDLDO      5
+#define BCM590XX_REG_SDXLDO     6
+#define BCM590XX_REG_MMCLDO1    7
+#define BCM590XX_REG_MMCLDO2    8
+#define BCM590XX_REG_AUDLDO     9
+#define BCM590XX_REG_MICLDO     10
+#define BCM590XX_REG_USBLDO     11
+#define BCM590XX_REG_VIBLDO     12
+
+/* DCDC regulator IDs */
+#define BCM590XX_REG_CSR        13
+#define BCM590XX_REG_IOSR1      14
+#define BCM590XX_REG_IOSR2      15
+#define BCM590XX_REG_MSR        16
+#define BCM590XX_REG_SDSR1      17
+#define BCM590XX_REG_SDSR2      18
+#define BCM590XX_REG_VSR        19
+
+#define BCM590XX_NUM_REGS       20
+
+#define BCM590XX_REG_IS_LDO(n)  (n < BCM590XX_REG_CSR)
+
+struct bcm590xx_board {
+        struct regulator_init_data *bcm590xx_pmu_init_data[BCM590XX_NUM_REGS];
+};
+
+/* LDO group A: supported voltages in microvolts */
+static const unsigned int ldo_a_table[] = {
+        1200000, 1800000, 2500000, 2700000, 2800000,
+        2900000, 3000000, 3300000,
+};
+
+/* LDO group C: supported voltages in microvolts */
+static const unsigned int ldo_c_table[] = {
+        3100000, 1800000, 2500000, 2700000, 2800000,
+        2900000, 3000000, 3300000,
+};
+
+/* DCDC group CSR: supported voltages in microvolts */
+static const struct regulator_linear_range dcdc_csr_ranges[] = {
+        REGULATOR_LINEAR_RANGE(860000, 2, 50, 10000),
+        REGULATOR_LINEAR_RANGE(1360000, 51, 55, 20000),
+        REGULATOR_LINEAR_RANGE(900000, 56, 63, 0),
+};
+
+/* DCDC group IOSR1: supported voltages in microvolts */
+static const struct regulator_linear_range dcdc_iosr1_ranges[] = {
+        REGULATOR_LINEAR_RANGE(860000, 2, 51, 10000),
+        REGULATOR_LINEAR_RANGE(1500000, 52, 52, 0),
+        REGULATOR_LINEAR_RANGE(1800000, 53, 53, 0),
+        REGULATOR_LINEAR_RANGE(900000, 54, 63, 0),
+};
+
+/* DCDC group SDSR1: supported voltages in microvolts */
+static const struct regulator_linear_range dcdc_sdsr1_ranges[] = {
+        REGULATOR_LINEAR_RANGE(860000, 2, 50, 10000),
+        REGULATOR_LINEAR_RANGE(1340000, 51, 51, 0),
+        REGULATOR_LINEAR_RANGE(900000, 52, 63, 0),
+};
+
+struct bcm590xx_info {
+        const char *name;
+        const char *vin_name;
+        u8 n_voltages;
+        const unsigned int *volt_table;
+        u8 n_linear_ranges;
+        const struct regulator_linear_range *linear_ranges;
+};
+
+#define BCM590XX_REG_TABLE(_name, _table) \
+        { \
+                .name = #_name, \
+                .n_voltages = ARRAY_SIZE(_table), \
+                .volt_table = _table, \
+        }
+
+#define BCM590XX_REG_RANGES(_name, _ranges) \
+        { \
+                .name = #_name, \
+                .n_linear_ranges = ARRAY_SIZE(_ranges), \
+                .linear_ranges = _ranges, \
+        }
+
+static struct bcm590xx_info bcm590xx_regs[] = {
+        BCM590XX_REG_TABLE(rfldo, ldo_a_table),
+        BCM590XX_REG_TABLE(camldo1, ldo_c_table),
+        BCM590XX_REG_TABLE(camldo2, ldo_c_table),
+        BCM590XX_REG_TABLE(simldo1, ldo_a_table),
+        BCM590XX_REG_TABLE(simldo2, ldo_a_table),
+        BCM590XX_REG_TABLE(sdldo, ldo_c_table),
+        BCM590XX_REG_TABLE(sdxldo, ldo_a_table),
+        BCM590XX_REG_TABLE(mmcldo1, ldo_a_table),
+        BCM590XX_REG_TABLE(mmcldo2, ldo_a_table),
+        BCM590XX_REG_TABLE(audldo, ldo_a_table),
+        BCM590XX_REG_TABLE(micldo, ldo_a_table),
+        BCM590XX_REG_TABLE(usbldo, ldo_a_table),
+        BCM590XX_REG_TABLE(vibldo, ldo_c_table),
+        BCM590XX_REG_RANGES(csr, dcdc_csr_ranges),
+        BCM590XX_REG_RANGES(iosr1, dcdc_iosr1_ranges),
+        BCM590XX_REG_RANGES(iosr2, dcdc_iosr1_ranges),
+        BCM590XX_REG_RANGES(msr, dcdc_iosr1_ranges),
+        BCM590XX_REG_RANGES(sdsr1, dcdc_sdsr1_ranges),
+        BCM590XX_REG_RANGES(sdsr2, dcdc_iosr1_ranges),
+        BCM590XX_REG_RANGES(vsr, dcdc_iosr1_ranges),
+};
+
+struct bcm590xx_reg {
+        struct regulator_desc *desc;
+        struct bcm590xx *mfd;
+        struct regulator_dev **rdev;
+        struct bcm590xx_info **info;
+};
+
+static int bcm590xx_get_vsel_register(int id)
+{
+        if (BCM590XX_REG_IS_LDO(id))
+                return BCM590XX_RFLDOCTRL + id;
+        else
+                return BCM590XX_CSRVOUT1 + (id - BCM590XX_REG_CSR) * 3;
+}
+
+static int bcm590xx_get_enable_register(int id)
+{
+        int reg = 0;
+
+        if (BCM590XX_REG_IS_LDO(id))
+                reg = BCM590XX_RFLDOPMCTRL1 + id * 2;
+        else
+                switch (id) {
+                case BCM590XX_REG_CSR:
+                        reg = BCM590XX_CSRPMCTRL1;
+                        break;
+                case BCM590XX_REG_IOSR1:
+                        reg = BCM590XX_IOSR1PMCTRL1;
+                        break;
+                case BCM590XX_REG_IOSR2:
+                        reg = BCM590XX_IOSR2PMCTRL1;
+                        break;
+                case BCM590XX_REG_MSR:
+                        reg = BCM590XX_MSRPMCTRL1;
+                        break;
+                case BCM590XX_REG_SDSR1:
+                        reg = BCM590XX_SDSR1PMCTRL1;
+                        break;
+                case BCM590XX_REG_SDSR2:
+                        reg = BCM590XX_SDSR2PMCTRL1;
+                        break;
+                };
+
+        return reg;
+}
+
+static struct regulator_ops bcm590xx_ops_ldo = {
+        .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,
+        .list_voltage           = regulator_list_voltage_table,
+        .map_voltage            = regulator_map_voltage_iterate,
+};
+
+static struct regulator_ops bcm590xx_ops_dcdc = {
+        .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,
+        .list_voltage           = regulator_list_voltage_linear_range,
+        .map_voltage            = regulator_map_voltage_linear_range,
+};
+
+#define BCM590XX_MATCH(_name, _id) \
+        { \
+                .name = #_name, \
+                .driver_data = (void *)&bcm590xx_regs[BCM590XX_REG_##_id], \
+        }
+
+static struct of_regulator_match bcm590xx_matches[] = {
+        BCM590XX_MATCH(rfldo, RFLDO),
+        BCM590XX_MATCH(camldo1, CAMLDO1),
+        BCM590XX_MATCH(camldo2, CAMLDO2),
+        BCM590XX_MATCH(simldo1, SIMLDO1),
+        BCM590XX_MATCH(simldo2, SIMLDO2),
+        BCM590XX_MATCH(sdldo, SDLDO),
+        BCM590XX_MATCH(sdxldo, SDXLDO),
+        BCM590XX_MATCH(mmcldo1, MMCLDO1),
+        BCM590XX_MATCH(mmcldo2, MMCLDO2),
+        BCM590XX_MATCH(audldo, AUDLDO),
+        BCM590XX_MATCH(micldo, MICLDO),
+        BCM590XX_MATCH(usbldo, USBLDO),
+        BCM590XX_MATCH(vibldo, VIBLDO),
+        BCM590XX_MATCH(csr, CSR),
+        BCM590XX_MATCH(iosr1, IOSR1),
+        BCM590XX_MATCH(iosr2, IOSR2),
+        BCM590XX_MATCH(msr, MSR),
+        BCM590XX_MATCH(sdsr1, SDSR1),
+        BCM590XX_MATCH(sdsr2, SDSR2),
+        BCM590XX_MATCH(vsr, VSR),
+};
+
+static struct bcm590xx_board *bcm590xx_parse_dt_reg_data(
+                struct platform_device *pdev,
+                struct of_regulator_match **bcm590xx_reg_matches)
+{
+        struct bcm590xx_board *data;
+        struct device_node *np = pdev->dev.parent->of_node;
+        struct device_node *regulators;
+        struct of_regulator_match *matches = bcm590xx_matches;
+        int count = ARRAY_SIZE(bcm590xx_matches);
+        int idx = 0;
+        int ret;
+
+        if (!np) {
+                dev_err(&pdev->dev, "of node not found\n");
+                return NULL;
+        }
+
+        data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+        if (!data) {
+                dev_err(&pdev->dev, "failed to allocate regulator board data\n");
+                return NULL;
+        }
+
+        np = of_node_get(np);
+        regulators = of_get_child_by_name(np, "regulators");
+        if (!regulators) {
+                dev_warn(&pdev->dev, "regulator node not found\n");
+                return NULL;
+        }
+
+        ret = of_regulator_match(&pdev->dev, regulators, matches, count);
+        of_node_put(regulators);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
+                        ret);
+                return NULL;
+        }
+
+        *bcm590xx_reg_matches = matches;
+
+        for (idx = 0; idx < count; idx++) {
+                if (!matches[idx].init_data || !matches[idx].of_node)
+                        continue;
+
+                data->bcm590xx_pmu_init_data[idx] = matches[idx].init_data;
+        }
+
+        return data;
+}
+
+static int bcm590xx_probe(struct platform_device *pdev)
+{
+        struct bcm590xx *bcm590xx = dev_get_drvdata(pdev->dev.parent);
+        struct bcm590xx_board *pmu_data = NULL;
+        struct bcm590xx_reg *pmu;
+        struct regulator_config config = { };
+        struct bcm590xx_info *info;
+        struct regulator_init_data *reg_data;
+        struct regulator_dev *rdev;
+        struct of_regulator_match *bcm590xx_reg_matches = NULL;
+        int i;
+
+        pmu_data = bcm590xx_parse_dt_reg_data(pdev,
+                                              &bcm590xx_reg_matches);
+
+        pmu = devm_kzalloc(&pdev->dev, sizeof(*pmu), GFP_KERNEL);
+        if (!pmu) {
+                dev_err(&pdev->dev, "Memory allocation failed for pmu\n");
+                return -ENOMEM;
+        }
+
+        pmu->mfd = bcm590xx;
+
+        platform_set_drvdata(pdev, pmu);
+
+        pmu->desc = devm_kzalloc(&pdev->dev, BCM590XX_NUM_REGS *
+                        sizeof(struct regulator_desc), GFP_KERNEL);
+        if (!pmu->desc) {
+                dev_err(&pdev->dev, "Memory alloc fails for desc\n");
+                return -ENOMEM;
+        }
+
+        pmu->info = devm_kzalloc(&pdev->dev, BCM590XX_NUM_REGS *
+                        sizeof(struct bcm590xx_info *), GFP_KERNEL);
+        if (!pmu->info) {
+                dev_err(&pdev->dev, "Memory alloc fails for info\n");
+                return -ENOMEM;
+        }
+
+        pmu->rdev = devm_kzalloc(&pdev->dev, BCM590XX_NUM_REGS *
+                        sizeof(struct regulator_dev *), GFP_KERNEL);
+        if (!pmu->rdev) {
+                dev_err(&pdev->dev, "Memory alloc fails for rdev\n");
+                return -ENOMEM;
+        }
+
+        info = bcm590xx_regs;
+
+        for (i = 0; i < BCM590XX_NUM_REGS; i++, info++) {
+                if (pmu_data)
+                        reg_data = pmu_data->bcm590xx_pmu_init_data[i];
+                else
+                        reg_data = NULL;
+
+                /* Register the regulators */
+                pmu->info[i] = info;
+
+                pmu->desc[i].name = info->name;
+                pmu->desc[i].supply_name = info->vin_name;
+                pmu->desc[i].id = i;
+                pmu->desc[i].volt_table = info->volt_table;
+                pmu->desc[i].n_voltages = info->n_voltages;
+                pmu->desc[i].linear_ranges = info->linear_ranges;
+                pmu->desc[i].n_linear_ranges = info->n_linear_ranges;
+
+                if (BCM590XX_REG_IS_LDO(i)) {
+                        pmu->desc[i].ops = &bcm590xx_ops_ldo;
+                        pmu->desc[i].vsel_mask = BCM590XX_LDO_VSEL_MASK;
+                } else {
+                        pmu->desc[i].ops = &bcm590xx_ops_dcdc;
+                        pmu->desc[i].vsel_mask = BCM590XX_SR_VSEL_MASK;
+                }
+
+                pmu->desc[i].vsel_reg = bcm590xx_get_vsel_register(i);
+                pmu->desc[i].enable_is_inverted = true;
+                pmu->desc[i].enable_mask = BCM590XX_REG_ENABLE;
+                pmu->desc[i].enable_reg = bcm590xx_get_enable_register(i);
+                pmu->desc[i].type = REGULATOR_VOLTAGE;
+                pmu->desc[i].owner = THIS_MODULE;
+
+                config.dev = bcm590xx->dev;
+                config.init_data = reg_data;
+                config.driver_data = pmu;
+                config.regmap = bcm590xx->regmap;
+
+                if (bcm590xx_reg_matches)
+                        config.of_node = bcm590xx_reg_matches[i].of_node;
+
+                rdev = devm_regulator_register(&pdev->dev, &pmu->desc[i],
+                                               &config);
+                if (IS_ERR(rdev)) {
+                        dev_err(bcm590xx->dev,
+                                "failed to register %s regulator\n",
+                                pdev->name);
+                        return PTR_ERR(rdev);
+                }
+
+                pmu->rdev[i] = rdev;
+        }
+
+        return 0;
+}
+
+static struct platform_driver bcm590xx_regulator_driver = {
+        .driver = {
+                .name = "bcm590xx-vregs",
+                .owner = THIS_MODULE,
+        },
+        .probe = bcm590xx_probe,
+};
+module_platform_driver(bcm590xx_regulator_driver);
+
+MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
+MODULE_DESCRIPTION("BCM590xx voltage regulator driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:bcm590xx-regulator");