regulator: pfuze100: add pfuze100 regulator driver

Add pfuze100 regulator driver.

Signed-off-by: Robin Gong <b38343@freescale.com>
Tested-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

3 files changed, 462 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 759b601b54ef..f9d02aabe306 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -355,6 +355,13 @@ config REGULATOR_PCF50633
          Say Y here to support the voltage regulators and convertors
          on PCF50633
 
+config REGULATOR_PFUZE100
+        tristate "Support regulators on Freescale PFUZE100 PMIC"
+        depends on I2C
+        help
+          Say y here to support the regulators found on the Freescale PFUZE100
+          PMIC.
+
 config REGULATOR_RC5T583
         tristate "RICOH RC5T583 Power regulators"
         depends on MFD_RC5T583
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index d240772d90ee..57838e2b0b8a 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
 obj-$(CONFIG_REGULATOR_PALMAS) += palmas-regulator.o
+obj-$(CONFIG_REGULATOR_PFUZE100) += pfuze100-regulator.o
 obj-$(CONFIG_REGULATOR_TPS51632) += tps51632-regulator.o
 obj-$(CONFIG_REGULATOR_PCAP) += pcap-regulator.o
 obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
new file mode 100644
index 000000000000..fcc7cd0d25cc
--- /dev/null
+++ b/drivers/regulator/pfuze100-regulator.c
@@ -0,0 +1,454 @@
+/*
+ * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/pfuze100.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+
+#define PFUZE_NUMREGS           128
+#define PFUZE100_VOL_OFFSET     0
+#define PFUZE100_STANDBY_OFFSET 1
+#define PFUZE100_MODE_OFFSET    3
+#define PFUZE100_CONF_OFFSET    4
+
+#define PFUZE100_DEVICEID       0x0
+#define PFUZE100_REVID          0x3
+#define PFUZE100_FABID          0x3
+
+#define PFUZE100_SW1ABVOL       0x20
+#define PFUZE100_SW1CVOL        0x2e
+#define PFUZE100_SW2VOL         0x35
+#define PFUZE100_SW3AVOL        0x3c
+#define PFUZE100_SW3BVOL        0x43
+#define PFUZE100_SW4VOL         0x4a
+#define PFUZE100_SWBSTCON1      0x66
+#define PFUZE100_VREFDDRCON     0x6a
+#define PFUZE100_VSNVSVOL       0x6b
+#define PFUZE100_VGEN1VOL       0x6c
+#define PFUZE100_VGEN2VOL       0x6d
+#define PFUZE100_VGEN3VOL       0x6e
+#define PFUZE100_VGEN4VOL       0x6f
+#define PFUZE100_VGEN5VOL       0x70
+#define PFUZE100_VGEN6VOL       0x71
+
+struct pfuze_regulator {
+        struct regulator_desc desc;
+        unsigned char stby_reg;
+        unsigned char stby_mask;
+};
+
+struct pfuze_chip {
+        struct regmap *regmap;
+        struct device *dev;
+        struct pfuze_regulator regulator_descs[PFUZE100_MAX_REGULATOR];
+        struct regulator_dev *regulators[PFUZE100_MAX_REGULATOR];
+};
+
+static const int pfuze100_swbst[] = {
+        5000000, 5050000, 5100000, 5150000,
+};
+
+static const int pfuze100_vsnvs[] = {
+        1000000, 1100000, 1200000, 1300000, 1500000, 1800000, 3000000,
+};
+
+static const struct i2c_device_id pfuze_device_id[] = {
+        {.name = "pfuze100"},
+        {},
+};
+MODULE_DEVICE_TABLE(i2c, pfuze_device_id);
+
+static const struct of_device_id pfuze_dt_ids[] = {
+        { .compatible = "fsl,pfuze100" },
+        {},
+};
+MODULE_DEVICE_TABLE(of, pfuze_dt_ids);
+
+static int pfuze100_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
+{
+        struct pfuze_chip *pfuze100 = rdev_get_drvdata(rdev);
+        int id = rdev->desc->id;
+        unsigned int val, ramp_bits, reg;
+        int ret;
+
+        if (id < PFUZE100_SWBST) {
+                if (id == PFUZE100_SW1AB)
+                        reg = PFUZE100_SW1ABVOL;
+                else
+                        reg = PFUZE100_SW1CVOL + (id - PFUZE100_SW1C) * 7;
+                regmap_read(pfuze100->regmap, reg, &val);
+
+                if (id <= PFUZE100_SW1C)
+                        ramp_delay = 25000 / (2 * ramp_delay);
+                else if (val & 0x40)
+                        ramp_delay = 50000 / (4 * ramp_delay);
+                else
+                        ramp_delay = 25000 / (2 * ramp_delay);
+
+                ramp_bits = (ramp_delay >> 1) - (ramp_delay >> 3);
+                ret = regmap_update_bits(pfuze100->regmap, reg + 4 , 0xc0,
+                                ramp_bits << 6);
+                if (ret < 0)
+                        dev_err(pfuze100->dev, "ramp failed, err %d\n", ret);
+        } else
+                ret = -EACCES;
+
+        return ret;
+}
+
+static struct regulator_ops pfuze100_ldo_regulator_ops = {
+        .enable = regulator_enable_regmap,
+        .disable = regulator_disable_regmap,
+        .is_enabled = regulator_is_enabled_regmap,
+        .list_voltage = regulator_list_voltage_linear,
+        .set_voltage_sel = regulator_set_voltage_sel_regmap,
+        .get_voltage_sel = regulator_get_voltage_sel_regmap,
+};
+
+static struct regulator_ops pfuze100_fixed_regulator_ops = {
+        .list_voltage = regulator_list_voltage_linear,
+};
+
+static struct regulator_ops pfuze100_sw_regulator_ops = {
+        .list_voltage = regulator_list_voltage_linear,
+        .set_voltage_sel = regulator_set_voltage_sel_regmap,
+        .get_voltage_sel = regulator_get_voltage_sel_regmap,
+        .set_voltage_time_sel = regulator_set_voltage_time_sel,
+        .set_ramp_delay = pfuze100_set_ramp_delay,
+};
+
+static struct regulator_ops pfuze100_swb_regulator_ops = {
+        .list_voltage = regulator_list_voltage_table,
+        .set_voltage_sel = regulator_set_voltage_sel_regmap,
+        .get_voltage_sel = regulator_get_voltage_sel_regmap,
+
+};
+
+#define PFUZE100_FIXED_REG(_name, base, voltage)        \
+        [PFUZE100_ ## _name] = {        \
+                .desc = {       \
+                        .name = #_name, \
+                        .n_voltages = 1,        \
+                        .ops = &pfuze100_fixed_regulator_ops,   \
+                        .type = REGULATOR_VOLTAGE,      \
+                        .id = PFUZE100_ ## _name,       \
+                        .owner = THIS_MODULE,   \
+                        .min_uV = (voltage),    \
+                        .enable_reg = (base),   \
+                        .enable_mask = 0x10,    \
+                },      \
+        }
+
+#define PFUZE100_SW_REG(_name, base, min, max, step)    \
+        [PFUZE100_ ## _name] = {        \
+                .desc = {       \
+                        .name = #_name,\
+                        .n_voltages = ((max) - (min)) / (step) + 1,     \
+                        .ops = &pfuze100_sw_regulator_ops,      \
+                        .type = REGULATOR_VOLTAGE,      \
+                        .id = PFUZE100_ ## _name,       \
+                        .owner = THIS_MODULE,   \
+                        .min_uV = (min),        \
+                        .uV_step = (step),      \
+                        .vsel_reg = (base) + PFUZE100_VOL_OFFSET,       \
+                        .vsel_mask = 0x3f,      \
+                },      \
+                .stby_reg = (base) + PFUZE100_STANDBY_OFFSET,   \
+                .stby_mask = 0x3f,      \
+        }
+
+#define PFUZE100_SWB_REG(_name, base, mask, voltages)   \
+        [PFUZE100_ ## _name] = {        \
+                .desc = {       \
+                        .name = #_name, \
+                        .n_voltages = ARRAY_SIZE(voltages),     \
+                        .ops = &pfuze100_swb_regulator_ops,     \
+                        .type = REGULATOR_VOLTAGE,      \
+                        .id = PFUZE100_ ## _name,       \
+                        .owner = THIS_MODULE,   \
+                        .volt_table = voltages, \
+                        .vsel_reg = (base),     \
+                        .vsel_mask = (mask),    \
+                },      \
+        }
+
+#define PFUZE100_VGEN_REG(_name, base, min, max, step)  \
+        [PFUZE100_ ## _name] = {        \
+                .desc = {       \
+                        .name = #_name, \
+                        .n_voltages = ((max) - (min)) / (step) + 1,     \
+                        .ops = &pfuze100_ldo_regulator_ops,     \
+                        .type = REGULATOR_VOLTAGE,      \
+                        .id = PFUZE100_ ## _name,       \
+                        .owner = THIS_MODULE,   \
+                        .min_uV = (min),        \
+                        .uV_step = (step),      \
+                        .vsel_reg = (base),     \
+                        .vsel_mask = 0xf,       \
+                        .enable_reg = (base),   \
+                        .enable_mask = 0x10,    \
+                },      \
+                .stby_reg = (base),     \
+                .stby_mask = 0x20,      \
+        }
+
+static struct pfuze_regulator pfuze100_regulators[] = {
+        PFUZE100_SW_REG(SW1AB, PFUZE100_SW1ABVOL, 300000, 1875000, 25000),
+        PFUZE100_SW_REG(SW1C, PFUZE100_SW1CVOL, 300000, 1875000, 25000),
+        PFUZE100_SW_REG(SW2, PFUZE100_SW2VOL, 400000, 1975000, 25000),
+        PFUZE100_SW_REG(SW3A, PFUZE100_SW3AVOL, 400000, 1975000, 25000),
+        PFUZE100_SW_REG(SW3B, PFUZE100_SW3BVOL, 400000, 1975000, 25000),
+        PFUZE100_SW_REG(SW4, PFUZE100_SW4VOL, 400000, 1975000, 25000),
+        PFUZE100_SWB_REG(SWBST, PFUZE100_SWBSTCON1, 0x3 , pfuze100_swbst),
+        PFUZE100_SWB_REG(VSNVS, PFUZE100_VSNVSVOL, 0x7, pfuze100_vsnvs),
+        PFUZE100_FIXED_REG(VREFDDR, PFUZE100_VREFDDRCON, 750000),
+        PFUZE100_VGEN_REG(VGEN1, PFUZE100_VGEN1VOL, 800000, 1550000, 50000),
+        PFUZE100_VGEN_REG(VGEN2, PFUZE100_VGEN2VOL, 800000, 1550000, 50000),
+        PFUZE100_VGEN_REG(VGEN3, PFUZE100_VGEN3VOL, 1800000, 3300000, 100000),
+        PFUZE100_VGEN_REG(VGEN4, PFUZE100_VGEN4VOL, 1800000, 3300000, 100000),
+        PFUZE100_VGEN_REG(VGEN5, PFUZE100_VGEN5VOL, 1800000, 3300000, 100000),
+        PFUZE100_VGEN_REG(VGEN6, PFUZE100_VGEN6VOL, 1800000, 3300000, 100000),
+};
+
+#ifdef CONFIG_OF
+static struct of_regulator_match pfuze100_matches[] = {
+        { .name = "sw1ab",      },
+        { .name = "sw1c",       },
+        { .name = "sw2",        },
+        { .name = "sw3a",       },
+        { .name = "sw3b",       },
+        { .name = "sw4",        },
+        { .name = "swbst",      },
+        { .name = "vsnvs",      },
+        { .name = "vrefddr",    },
+        { .name = "vgen1",      },
+        { .name = "vgen2",      },
+        { .name = "vgen3",      },
+        { .name = "vgen4",      },
+        { .name = "vgen5",      },
+        { .name = "vgen6",      },
+};
+
+static int pfuze_parse_regulators_dt(struct pfuze_chip *chip)
+{
+        struct device *dev = chip->dev;
+        struct device_node *np, *parent;
+        int ret;
+
+        np = of_node_get(dev->parent->of_node);
+        if (!np)
+                return 0;
+
+        parent = of_find_node_by_name(np, "regulators");
+        if (!parent) {
+                dev_err(dev, "regulators node not found\n");
+                return -EINVAL;
+        }
+
+        ret = of_regulator_match(dev, parent, pfuze100_matches,
+                                 ARRAY_SIZE(pfuze100_matches));
+
+        of_node_put(parent);
+        if (ret < 0) {
+                dev_err(dev, "Error parsing regulator init data: %d\n",
+                        ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+static inline struct regulator_init_data *match_init_data(int index)
+{
+        return pfuze100_matches[index].init_data;
+}
+
+static inline struct device_node *match_of_node(int index)
+{
+        return pfuze100_matches[index].of_node;
+}
+#else
+static int pfuze_parse_regulators_dt(struct pfuze_chip *chip)
+{
+        return NULL;
+}
+
+static inline struct regulator_init_data *match_init_data(int index)
+{
+        return NULL;
+}
+
+static inline struct device_node *match_of_node(int index)
+{
+        return NULL;
+}
+#endif
+
+static int pfuze_identify(struct pfuze_chip *pfuze_chip)
+{
+        unsigned int value;
+        int ret;
+
+        ret = regmap_read(pfuze_chip->regmap, PFUZE100_DEVICEID, &value);
+        if (ret)
+                return ret;
+
+        if (value & 0x0f) {
+                dev_warn(pfuze_chip->dev, "Illegal ID: %x\n", value);
+                return -ENODEV;
+        }
+
+        ret = regmap_read(pfuze_chip->regmap, PFUZE100_REVID, &value);
+        if (ret)
+                return ret;
+        dev_info(pfuze_chip->dev,
+                 "Full lay: %x, Metal lay: %x\n",
+                 (value & 0xf0) >> 4, value & 0x0f);
+
+        ret = regmap_read(pfuze_chip->regmap, PFUZE100_FABID, &value);
+        if (ret)
+                return ret;
+        dev_info(pfuze_chip->dev, "FAB: %x, FIN: %x\n",
+                 (value & 0xc) >> 2, value & 0x3);
+
+        return 0;
+}
+
+static const struct regmap_config pfuze_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+        .max_register = PFUZE_NUMREGS,
+        .cache_type = REGCACHE_RBTREE,
+};
+
+static int pfuze100_regulator_probe(struct i2c_client *client,
+                                    const struct i2c_device_id *id)
+{
+        struct pfuze_chip *pfuze_chip;
+        struct pfuze_regulator_platform_data *pdata =
+            dev_get_platdata(&client->dev);
+        struct regulator_config config = { };
+        int i, ret;
+
+        pfuze_chip = devm_kzalloc(&client->dev, sizeof(*pfuze_chip),
+                        GFP_KERNEL);
+        if (!pfuze_chip)
+                return -ENOMEM;
+
+        dev_set_drvdata(&client->dev, pfuze_chip);
+
+        memcpy(pfuze_chip->regulator_descs, pfuze100_regulators,
+                sizeof(pfuze_chip->regulator_descs));
+
+        pfuze_chip->dev = &client->dev;
+
+        pfuze_chip->regmap = devm_regmap_init_i2c(client, &pfuze_regmap_config);
+        if (IS_ERR(pfuze_chip->regmap)) {
+                ret = PTR_ERR(pfuze_chip->regmap);
+                dev_err(&client->dev,
+                        "regmap allocation failed with err %d\n", ret);
+                return ret;
+        }
+
+        ret = pfuze_identify(pfuze_chip);
+        if (ret) {
+                dev_err(&client->dev, "unrecognized pfuze chip ID!\n");
+                return ret;
+        }
+
+        ret = pfuze_parse_regulators_dt(pfuze_chip);
+        if (ret)
+                return ret;
+
+        for (i = 0; i < PFUZE100_MAX_REGULATOR; i++) {
+                struct regulator_init_data *init_data;
+                int val;
+
+                if (pdata)
+                        init_data = pdata->init_data[i];
+                else
+                        init_data = match_init_data(i);
+
+                /* SW2~SW4 high bit check and modify the voltage value table */
+                if (i > PFUZE100_SW1C && i < PFUZE100_SWBST) {
+                        regmap_read(pfuze_chip->regmap, PFUZE100_SW2VOL +
+                                        (i - PFUZE100_SW2) * 7, &val);
+                        if (val & 0x40) {
+                                pfuze_chip->regulator_descs[i].desc.min_uV
+                                = 800000;
+                                pfuze_chip->regulator_descs[i].desc.uV_step
+                                = 50000;
+                        }
+                }
+
+                config.dev = &client->dev;
+                config.init_data = init_data;
+                config.driver_data = pfuze_chip;
+                config.of_node = match_of_node(i);
+
+                pfuze_chip->regulators[i] = regulator_register(&pfuze_chip
+                        ->regulator_descs[i].desc, &config);
+                if (IS_ERR(pfuze_chip->regulators[i])) {
+                        dev_err(&client->dev, "register regulator%s failed\n",
+                                pfuze100_regulators[i].desc.name);
+                        ret = PTR_ERR(pfuze_chip->regulators[i]);
+                        while (--i >= 0)
+                                regulator_unregister(pfuze_chip->regulators[i]);
+                        return ret;
+                }
+        }
+
+        return 0;
+}
+
+static int pfuze100_regulator_remove(struct i2c_client *client)
+{
+        int i;
+        struct pfuze_chip *pfuze_chip = dev_get_drvdata(&client->dev);
+
+        for (i = 0; i < PFUZE100_MAX_REGULATOR; i++)
+                regulator_unregister(pfuze_chip->regulators[i]);
+
+        return 0;
+}
+
+static struct i2c_driver pfuze_driver = {
+        .id_table = pfuze_device_id,
+        .driver = {
+                .name = "pfuze100-regulator",
+                .owner = THIS_MODULE,
+                .of_match_table = pfuze_dt_ids,
+        },
+        .probe = pfuze100_regulator_probe,
+        .remove = pfuze100_regulator_remove,
+};
+module_i2c_driver(pfuze_driver);
+
+MODULE_AUTHOR("Robin Gong <b38343@freescale.com>");
+MODULE_DESCRIPTION("Regulator Driver for Freescale PFUZE100 PMIC");
+MODULE_ALIAS("pfuze100-regulator");