regulator: add TPS6586X regulator driver

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 387 insertions, 0 deletions

diff --git a/drivers/regulator/tps6586x-regulator.c b/drivers/regulator/tps6586x-regulator.c
new file mode 100644
index 000000000000..76cc41ecbdf7
--- /dev/null
+++ b/drivers/regulator/tps6586x-regulator.c
@@ -0,0 +1,387 @@
+/*
+ * Regulator driver for TI TPS6586x
+ *
+ * Copyright (C) 2010 Compulab Ltd.
+ * Author: Mike Rapoport <mike@compulab.co.il>
+ *
+ * Based on da903x
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ * Copyright (C) 2008 Compulab Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define DEBUG
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/tps6586x.h>
+
+/* supply control and voltage setting  */
+#define TPS6586X_SUPPLYENA      0x10
+#define TPS6586X_SUPPLYENB      0x11
+#define TPS6586X_SUPPLYENC      0x12
+#define TPS6586X_SUPPLYEND      0x13
+#define TPS6586X_SUPPLYENE      0x14
+#define TPS6586X_VCC1           0x20
+#define TPS6586X_VCC2           0x21
+#define TPS6586X_SM1V1          0x23
+#define TPS6586X_SM1V2          0x24
+#define TPS6586X_SM1SL          0x25
+#define TPS6586X_SM0V1          0x26
+#define TPS6586X_SM0V2          0x27
+#define TPS6586X_SM0SL          0x28
+#define TPS6586X_LDO2AV1        0x29
+#define TPS6586X_LDO2AV2        0x2A
+#define TPS6586X_LDO2BV1        0x2F
+#define TPS6586X_LDO2BV2        0x30
+#define TPS6586X_LDO4V1         0x32
+#define TPS6586X_LDO4V2         0x33
+
+/* converter settings  */
+#define TPS6586X_SUPPLYV1       0x41
+#define TPS6586X_SUPPLYV2       0x42
+#define TPS6586X_SUPPLYV3       0x43
+#define TPS6586X_SUPPLYV4       0x44
+#define TPS6586X_SUPPLYV5       0x45
+#define TPS6586X_SUPPLYV6       0x46
+#define TPS6586X_SMODE1         0x47
+#define TPS6586X_SMODE2         0x48
+
+struct tps6586x_regulator {
+        struct regulator_desc desc;
+
+        int volt_reg;
+        int volt_shift;
+        int volt_nbits;
+        int enable_bit[2];
+        int enable_reg[2];
+
+        int *voltages;
+
+        /* for DVM regulators */
+        int go_reg;
+        int go_bit;
+};
+
+static inline struct device *to_tps6586x_dev(struct regulator_dev *rdev)
+{
+        return rdev_get_dev(rdev)->parent->parent;
+}
+
+static int tps6586x_ldo_list_voltage(struct regulator_dev *rdev,
+                                     unsigned selector)
+{
+        struct tps6586x_regulator *info = rdev_get_drvdata(rdev);
+
+        return info->voltages[selector];
+}
+
+
+static int __tps6586x_ldo_set_voltage(struct device *parent,
+                                      struct tps6586x_regulator *ri,
+                                      int min_uV, int max_uV)
+{
+        int val, uV;
+        uint8_t mask;
+
+        for (val = 0; val < ri->desc.n_voltages; val++) {
+                uV = ri->voltages[val] * 1000;
+
+                /* LDO0 has minimal voltage 1.2 rather than 1.25 */
+                if (ri->desc.id == TPS6586X_ID_LDO_0 && val == 0)
+                        uV -= 50 * 1000;
+
+                /* use the first in-range value */
+                if (min_uV <= uV && uV <= max_uV) {
+
+                        val <<= ri->volt_shift;
+                        mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
+
+                        return tps6586x_update(parent, ri->volt_reg, val, mask);
+                }
+        }
+
+        return -EINVAL;
+}
+
+static int tps6586x_ldo_set_voltage(struct regulator_dev *rdev,
+                                    int min_uV, int max_uV)
+{
+        struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+        struct device *parent = to_tps6586x_dev(rdev);
+
+        return __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV);
+}
+
+static int tps6586x_ldo_get_voltage(struct regulator_dev *rdev)
+{
+        struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+        struct device *parent = to_tps6586x_dev(rdev);
+        uint8_t val, mask;
+        int ret;
+
+        ret = tps6586x_read(parent, ri->volt_reg, &val);
+        if (ret)
+                return ret;
+
+        mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
+        val = (val & mask) >> ri->volt_shift;
+
+        if (val > ri->desc.n_voltages)
+                BUG();
+
+        return ri->voltages[val];
+}
+
+static int tps6586x_dvm_set_voltage(struct regulator_dev *rdev,
+                                    int min_uV, int max_uV)
+{
+        struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+        struct device *parent = to_tps6586x_dev(rdev);
+        int ret;
+
+        ret = __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV);
+        if (ret)
+                return ret;
+
+        return tps6586x_set_bits(parent, ri->go_reg, ri->go_bit);
+}
+
+static int tps6586x_regulator_enable(struct regulator_dev *rdev)
+{
+        struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+        struct device *parent = to_tps6586x_dev(rdev);
+
+        return tps6586x_set_bits(parent, ri->enable_reg[0],
+                                 1 << ri->enable_bit[0]);
+}
+
+static int tps6586x_regulator_disable(struct regulator_dev *rdev)
+{
+        struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+        struct device *parent = to_tps6586x_dev(rdev);
+
+        return tps6586x_clr_bits(parent, ri->enable_reg[0],
+                                 1 << ri->enable_bit[0]);
+}
+
+static int tps6586x_regulator_is_enabled(struct regulator_dev *rdev)
+{
+        struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
+        struct device *parent = to_tps6586x_dev(rdev);
+        uint8_t reg_val;
+        int ret;
+
+        ret = tps6586x_read(parent, ri->enable_reg[0], &reg_val);
+        if (ret)
+                return ret;
+
+        return !!(reg_val & (1 << ri->enable_bit[0]));
+}
+
+static struct regulator_ops tps6586x_regulator_ldo_ops = {
+        .list_voltage = tps6586x_ldo_list_voltage,
+        .get_voltage = tps6586x_ldo_get_voltage,
+        .set_voltage = tps6586x_ldo_set_voltage,
+
+        .is_enabled = tps6586x_regulator_is_enabled,
+        .enable = tps6586x_regulator_enable,
+        .disable = tps6586x_regulator_disable,
+};
+
+static struct regulator_ops tps6586x_regulator_dvm_ops = {
+        .list_voltage = tps6586x_ldo_list_voltage,
+        .get_voltage = tps6586x_ldo_get_voltage,
+        .set_voltage = tps6586x_dvm_set_voltage,
+
+        .is_enabled = tps6586x_regulator_is_enabled,
+        .enable = tps6586x_regulator_enable,
+        .disable = tps6586x_regulator_disable,
+};
+
+static int tps6586x_ldo_voltages[] = {
+        1250, 1500, 1800, 2500, 2700, 2850, 3100, 3300,
+};
+
+static int tps6586x_ldo4_voltages[] = {
+        1700, 1725, 1750, 1775, 1800, 1825, 1850, 1875,
+        1900, 1925, 1950, 1975, 2000, 2025, 2050, 2075,
+        2100, 2125, 2150, 2175, 2200, 2225, 2250, 2275,
+        2300, 2325, 2350, 2375, 2400, 2425, 2450, 2475,
+};
+
+static int tps6586x_dvm_voltages[] = {
+         725,  750,  775,  800,  825,  850,  875,  900,
+         925,  950,  975, 1000, 1025, 1050, 1075, 1100,
+        1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
+        1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
+};
+
+#define TPS6586X_REGULATOR(_id, vdata, _ops, vreg, shift, nbits,        \
+                           ereg0, ebit0, ereg1, ebit1, goreg, gobit)    \
+{                                                                       \
+        .desc   = {                                                     \
+                .name   = "REG-" #_id,                                  \
+                .ops    = &tps6586x_regulator_##_ops,                   \
+                .type   = REGULATOR_VOLTAGE,                            \
+                .id     = TPS6586X_ID_##_id,                            \
+                .n_voltages = ARRAY_SIZE(tps6586x_##vdata##_voltages),  \
+                .owner  = THIS_MODULE,                                  \
+        },                                                              \
+        .volt_reg       = TPS6586X_##vreg,                              \
+        .volt_shift     = (shift),                                      \
+        .volt_nbits     = (nbits),                                      \
+        .enable_reg[0]  = TPS6586X_SUPPLY##ereg0,                       \
+        .enable_bit[0]  = (ebit0),                                      \
+        .enable_reg[1]  = TPS6586X_SUPPLY##ereg1,                       \
+        .enable_bit[1]  = (ebit1),                                      \
+        .voltages       = tps6586x_##vdata##_voltages,                  \
+}
+
+#define TPS6586X_LDO(_id, vdata, vreg, shift, nbits,                    \
+                     ereg0, ebit0, ereg1, ebit1)                        \
+        TPS6586X_REGULATOR(_id, vdata, ldo_ops, vreg, shift, nbits,     \
+                           ereg0, ebit0, ereg1, ebit1, 0, 0)
+
+#define TPS6586X_DVM(_id, vdata, vreg, shift, nbits,                    \
+                     ereg0, ebit0, ereg1, ebit1, goreg, gobit)          \
+        TPS6586X_REGULATOR(_id, vdata, dvm_ops, vreg, shift, nbits,     \
+                           ereg0, ebit0, ereg1, ebit1, goreg, gobit)
+
+static struct tps6586x_regulator tps6586x_regulator[] = {
+        TPS6586X_LDO(LDO_0, ldo, SUPPLYV1, 5, 3, ENC, 0, END, 0),
+        TPS6586X_LDO(LDO_3, ldo, SUPPLYV4, 0, 3, ENC, 2, END, 2),
+        TPS6586X_LDO(LDO_5, ldo, SUPPLYV6, 0, 3, ENE, 6, ENE, 6),
+        TPS6586X_LDO(LDO_6, ldo, SUPPLYV3, 0, 3, ENC, 4, END, 4),
+        TPS6586X_LDO(LDO_7, ldo, SUPPLYV3, 3, 3, ENC, 5, END, 5),
+        TPS6586X_LDO(LDO_8, ldo, SUPPLYV1, 5, 3, ENC, 6, END, 6),
+        TPS6586X_LDO(LDO_9, ldo, SUPPLYV6, 3, 3, ENE, 7, ENE, 7),
+        TPS6586X_LDO(LDO_RTC, ldo, SUPPLYV4, 3, 3, ENE, 7, ENE, 7),
+        TPS6586X_LDO(LDO_1, dvm, SUPPLYV1, 0, 5, ENC, 1, END, 1),
+        TPS6586X_LDO(SM_2, dvm, SUPPLYV2, 0, 5, ENC, 1, END, 1),
+
+        TPS6586X_DVM(LDO_2, dvm, LDO2BV1, 0, 5, ENA, 3, ENB, 3, VCC2, 6),
+        TPS6586X_DVM(LDO_4, ldo4, LDO4V1, 0, 5, ENC, 3, END, 3, VCC1, 6),
+        TPS6586X_DVM(SM_0, dvm, SM0V1, 0, 5, ENA, 1, ENB, 1, VCC1, 2),
+        TPS6586X_DVM(SM_1, dvm, SM1V1, 0, 5, ENA, 0, ENB, 0, VCC1, 0),
+};
+
+/*
+ * TPS6586X has 2 enable bits that are OR'ed to determine the actual
+ * regulator state. Clearing one of this bits allows switching
+ * regulator on and of with single register write.
+ */
+static inline int tps6586x_regulator_preinit(struct device *parent,
+                                             struct tps6586x_regulator *ri)
+{
+        uint8_t val1, val2;
+        int ret;
+
+        ret = tps6586x_read(parent, ri->enable_reg[0], &val1);
+        if (ret)
+                return ret;
+
+        ret = tps6586x_read(parent, ri->enable_reg[1], &val2);
+        if (ret)
+                return ret;
+
+        if (!(val2 & ri->enable_bit[1]))
+                return 0;
+
+        /*
+         * The regulator is on, but it's enabled with the bit we don't
+         * want to use, so we switch the enable bits
+         */
+        if (!(val1 & ri->enable_bit[0])) {
+                ret = tps6586x_set_bits(parent, ri->enable_reg[0],
+                                        1 << ri->enable_bit[0]);
+                if (ret)
+                        return ret;
+        }
+
+        return tps6586x_clr_bits(parent, ri->enable_reg[1],
+                                 1 << ri->enable_bit[1]);
+}
+
+static inline struct tps6586x_regulator *find_regulator_info(int id)
+{
+        struct tps6586x_regulator *ri;
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(tps6586x_regulator); i++) {
+                ri = &tps6586x_regulator[i];
+                if (ri->desc.id == id)
+                        return ri;
+        }
+        return NULL;
+}
+
+static int __devinit tps6586x_regulator_probe(struct platform_device *pdev)
+{
+        struct tps6586x_regulator *ri = NULL;
+        struct regulator_dev *rdev;
+        int id = pdev->id;
+        int err;
+
+        dev_dbg(&pdev->dev, "Probing reulator %d\n", id);
+
+        ri = find_regulator_info(id);
+        if (ri == NULL) {
+                dev_err(&pdev->dev, "invalid regulator ID specified\n");
+                return -EINVAL;
+        }
+
+        err = tps6586x_regulator_preinit(pdev->dev.parent, ri);
+        if (err)
+                return err;
+
+        rdev = regulator_register(&ri->desc, &pdev->dev,
+                                  pdev->dev.platform_data, ri);
+        if (IS_ERR(rdev)) {
+                dev_err(&pdev->dev, "failed to register regulator %s\n",
+                                ri->desc.name);
+                return PTR_ERR(rdev);
+        }
+
+        platform_set_drvdata(pdev, ri);
+
+        return 0;
+}
+
+static int __devexit tps6586x_regulator_remove(struct platform_device *pdev)
+{
+        return 0;
+}
+
+static struct platform_driver tps6586x_regulator_driver = {
+        .driver = {
+                .name   = "tps6586x-regulator",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = tps6586x_regulator_probe,
+        .remove         = __devexit_p(tps6586x_regulator_remove),
+};
+
+static int __init tps6586x_regulator_init(void)
+{
+        return platform_driver_register(&tps6586x_regulator_driver);
+}
+subsys_initcall(tps6586x_regulator_init);
+
+static void __exit tps6586x_regulator_exit(void)
+{
+        platform_driver_unregister(&tps6586x_regulator_driver);
+}
+module_exit(tps6586x_regulator_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
+MODULE_DESCRIPTION("Regulator Driver for TI TPS6586X PMIC");
+MODULE_ALIAS("platform:tps6586x-regulator");