regulator: TPS62360: Add tps62360 regulator driver
Laxman Dewangan [Mon, 9 Jan 2012 14:57:41 +0000 (19:57 +0530)]
The regulator module consists of 1 DCDC. The output voltage
is configurable and is meant for supply power to the core
voltage of Soc.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

Cherrypick from Mainline commit
6219929f5f82708309b3054ec7db6cb6e3ee47d5

Change-Id: Idfdbf06f7d01e0faaabcb658311a9aa5324ddc68
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/77341
Reviewed-by: Automatic_Commit_Validation_User

Rebase-Id: Ra4ddf30d7534d1ef55339ba2963c5523325c4306

drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/tps62360-regulator.c [new file with mode: 0644]
include/linux/regulator/tps62360.h [new file with mode: 0644]

index b138e4e..0a6ac55 100644 (file)
@@ -344,6 +344,16 @@ config REGULATOR_TPS65910
        help
          This driver supports TPS65910 voltage regulator chips.
 
+config REGULATOR_TPS62360
+       tristate "TI TPS62360 Power Regulator"
+       depends on I2C
+       select REGMAP_I2C
+       help
+         This driver supports TPS62360 voltage regulator chip. This
+         regulator is meant for processor core supply. This chip is
+         high-frequency synchronous step down dc-dc converter optimized
+         for battery-powered portable applications.
+
 config REGULATOR_AAT2870
        tristate "AnalogicTech AAT2870 Regulators"
        depends on MFD_AAT2870_CORE
index 0413b59..bde4411 100644 (file)
@@ -54,6 +54,7 @@ obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
 obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
 obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
+obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o
 obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
 obj-$(CONFIG_REGULATOR_GPIO_SWITCH)    += gpio-switch-regulator.o
 obj-$(CONFIG_REGULATOR_FAN53555) += fan53555-regulator.o
diff --git a/drivers/regulator/tps62360-regulator.c b/drivers/regulator/tps62360-regulator.c
new file mode 100644 (file)
index 0000000..f778ef0
--- /dev/null
@@ -0,0 +1,472 @@
+/*
+ * tps62360.c -- TI tps62360
+ *
+ * Driver for processor core supply tps62360 and tps62361B
+ *
+ * Copyright (c) 2012, NVIDIA Corporation.
+ *
+ * Author: Laxman Dewangan <ldewangan@nvidia.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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; 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/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/tps62360.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+
+/* Register definitions */
+#define REG_VSET0              0
+#define REG_VSET1              1
+#define REG_VSET2              2
+#define REG_VSET3              3
+#define REG_CONTROL            4
+#define REG_TEMP               5
+#define REG_RAMPCTRL           6
+#define REG_CHIPID             8
+
+enum chips {TPS62360, TPS62361};
+
+#define TPS62360_BASE_VOLTAGE  770
+#define TPS62360_N_VOLTAGES    64
+
+#define TPS62361_BASE_VOLTAGE  500
+#define TPS62361_N_VOLTAGES    128
+
+/* tps 62360 chip information */
+struct tps62360_chip {
+       const char *name;
+       struct device *dev;
+       struct regulator_desc desc;
+       struct i2c_client *client;
+       struct regulator_dev *rdev;
+       struct regmap *regmap;
+       int chip_id;
+       int vsel0_gpio;
+       int vsel1_gpio;
+       int voltage_base;
+       u8 voltage_reg_mask;
+       bool en_internal_pulldn;
+       bool en_force_pwm;
+       bool en_discharge;
+       bool valid_gpios;
+       int lru_index[4];
+       int curr_vset_vsel[4];
+       int curr_vset_id;
+};
+
+/*
+ * find_voltage_set_register: Find new voltage configuration register
+ * (VSET) id.
+ * The finding of the new VSET register will be based on the LRU mechanism.
+ * Each VSET register will have different voltage configured . This
+ * Function will look if any of the VSET register have requested voltage set
+ * or not.
+ *     - If it is already there then it will make that register as most
+ *       recently used and return as found so that caller need not to set
+ *       the VSET register but need to set the proper gpios to select this
+ *       VSET register.
+ *     - If requested voltage is not found then it will use the least
+ *       recently mechanism to get new VSET register for new configuration
+ *       and will return not_found so that caller need to set new VSET
+ *       register and then gpios (both).
+ */
+static bool find_voltage_set_register(struct tps62360_chip *tps,
+               int req_vsel, int *vset_reg_id)
+{
+       int i;
+       bool found = false;
+       int new_vset_reg = tps->lru_index[3];
+       int found_index = 3;
+       for (i = 0; i < 4; ++i) {
+               if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
+                       new_vset_reg = tps->lru_index[i];
+                       found_index = i;
+                       found = true;
+                       goto update_lru_index;
+               }
+       }
+
+update_lru_index:
+       for (i = found_index; i > 0; i--)
+               tps->lru_index[i] = tps->lru_index[i - 1];
+
+       tps->lru_index[0] = new_vset_reg;
+       *vset_reg_id = new_vset_reg;
+       return found;
+}
+
+static int tps62360_dcdc_get_voltage(struct regulator_dev *dev)
+{
+       struct tps62360_chip *tps = rdev_get_drvdata(dev);
+       int vsel;
+       unsigned int data;
+       int ret;
+
+       ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
+       if (ret < 0) {
+               dev_err(tps->dev, "%s: Error in reading register %d\n",
+                       __func__, REG_VSET0 + tps->curr_vset_id);
+               return ret;
+       }
+       vsel = (int)data & tps->voltage_reg_mask;
+       return (tps->voltage_base + vsel * 10) * 1000;
+}
+
+static int tps62360_dcdc_set_voltage(struct regulator_dev *dev,
+            int min_uV, int max_uV, unsigned *selector)
+{
+       struct tps62360_chip *tps = rdev_get_drvdata(dev);
+       int vsel;
+       int ret;
+       bool found = false;
+       int new_vset_id = tps->curr_vset_id;
+
+       if (max_uV < min_uV)
+               return -EINVAL;
+
+       if (min_uV >
+               ((tps->voltage_base + (tps->desc.n_voltages - 1) * 10) * 1000))
+               return -EINVAL;
+
+       if (max_uV < tps->voltage_base * 1000)
+               return -EINVAL;
+
+       vsel = DIV_ROUND_UP(min_uV - (tps->voltage_base * 1000), 10000);
+       if (selector)
+               *selector = (vsel & tps->voltage_reg_mask);
+
+       /*
+        * If gpios are available to select the VSET register then least
+        * recently used register for new configuration.
+        */
+       if (tps->valid_gpios)
+               found = find_voltage_set_register(tps, vsel, &new_vset_id);
+
+       if (!found) {
+               ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
+                               tps->voltage_reg_mask, vsel);
+               if (ret < 0) {
+                       dev_err(tps->dev, "%s: Error in updating register %d\n",
+                                __func__, REG_VSET0 + new_vset_id);
+                       return ret;
+               }
+               tps->curr_vset_id = new_vset_id;
+               tps->curr_vset_vsel[new_vset_id] = vsel;
+       }
+
+       /* Select proper VSET register vio gpios */
+       if (tps->valid_gpios) {
+               gpio_set_value_cansleep(tps->vsel0_gpio,
+                                       new_vset_id & 0x1);
+               gpio_set_value_cansleep(tps->vsel1_gpio,
+                                       (new_vset_id >> 1) & 0x1);
+       }
+       return 0;
+}
+
+static int tps62360_dcdc_list_voltage(struct regulator_dev *dev,
+                                       unsigned selector)
+{
+       struct tps62360_chip *tps = rdev_get_drvdata(dev);
+
+       if ((selector < 0) || (selector >= tps->desc.n_voltages))
+               return -EINVAL;
+       return (tps->voltage_base + selector * 10) * 1000;
+}
+
+static struct regulator_ops tps62360_dcdc_ops = {
+       .get_voltage = tps62360_dcdc_get_voltage,
+       .set_voltage = tps62360_dcdc_set_voltage,
+       .list_voltage = tps62360_dcdc_list_voltage,
+};
+
+static int tps62360_init_force_pwm(struct tps62360_chip *tps,
+       struct tps62360_regulator_platform_data *pdata,
+       int vset_id)
+{
+       unsigned int data;
+       int ret;
+       ret = regmap_read(tps->regmap, REG_VSET0 + vset_id, &data);
+       if (ret < 0) {
+               dev_err(tps->dev, "%s() fails in writing reg %d\n",
+                       __func__, REG_VSET0 + vset_id);
+               return ret;
+       }
+       tps->curr_vset_vsel[vset_id] = data & tps->voltage_reg_mask;
+       if (pdata->en_force_pwm)
+               data |= BIT(7);
+       else
+               data &= ~BIT(7);
+       ret = regmap_write(tps->regmap, REG_VSET0 + vset_id, data);
+       if (ret < 0)
+               dev_err(tps->dev, "%s() fails in writing reg %d\n",
+                               __func__, REG_VSET0 + vset_id);
+       return ret;
+}
+
+static int tps62360_init_dcdc(struct tps62360_chip *tps,
+               struct tps62360_regulator_platform_data *pdata)
+{
+       int ret;
+       int i;
+
+       /* Initailize internal pull up/down control */
+       if (tps->en_internal_pulldn)
+               ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
+       else
+               ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
+       if (ret < 0) {
+               dev_err(tps->dev, "%s() fails in writing reg %d\n",
+                       __func__, REG_CONTROL);
+               return ret;
+       }
+
+       /* Initailize force PWM mode */
+       if (tps->valid_gpios) {
+               for (i = 0; i < 4; ++i) {
+                       ret = tps62360_init_force_pwm(tps, pdata, i);
+                       if (ret < 0)
+                               return ret;
+               }
+       } else {
+               ret = tps62360_init_force_pwm(tps, pdata, tps->curr_vset_id);
+               if (ret < 0)
+                       return ret;
+       }
+
+       /* Reset output discharge path to reduce power consumption */
+       ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
+       if (ret < 0)
+               dev_err(tps->dev, "%s() fails in updating reg %d\n",
+                       __func__, REG_RAMPCTRL);
+       return ret;
+}
+
+static const struct regmap_config tps62360_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+};
+
+static int __devinit tps62360_probe(struct i2c_client *client,
+                                    const struct i2c_device_id *id)
+{
+       struct tps62360_regulator_platform_data *pdata;
+       struct regulator_dev *rdev;
+       struct tps62360_chip *tps;
+       int ret;
+       int i;
+
+       pdata = client->dev.platform_data;
+       if (!pdata) {
+               dev_err(&client->dev, "%s() Err: Platform data not found\n",
+                                               __func__);
+               return -EIO;
+       }
+
+       tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
+       if (!tps) {
+               dev_err(&client->dev, "%s() Err: Memory allocation fails\n",
+                                               __func__);
+               return -ENOMEM;
+       }
+
+       tps->en_force_pwm = pdata->en_force_pwm;
+       tps->en_discharge = pdata->en_discharge;
+       tps->en_internal_pulldn = pdata->en_internal_pulldn;
+       tps->vsel0_gpio = pdata->vsel0_gpio;
+       tps->vsel1_gpio = pdata->vsel1_gpio;
+       tps->client = client;
+       tps->dev = &client->dev;
+       tps->name = id->name;
+       tps->voltage_base = (id->driver_data == TPS62360) ?
+                               TPS62360_BASE_VOLTAGE : TPS62361_BASE_VOLTAGE;
+       tps->voltage_reg_mask = (id->driver_data == TPS62360) ? 0x3F : 0x7F;
+
+       tps->desc.name = id->name;
+       tps->desc.id = 0;
+       tps->desc.n_voltages = (id->driver_data == TPS62360) ?
+                               TPS62360_N_VOLTAGES : TPS62361_N_VOLTAGES;
+       tps->desc.ops = &tps62360_dcdc_ops;
+       tps->desc.type = REGULATOR_VOLTAGE;
+       tps->desc.owner = THIS_MODULE;
+       tps->regmap = regmap_init_i2c(client, &tps62360_regmap_config);
+       if (IS_ERR(tps->regmap)) {
+               ret = PTR_ERR(tps->regmap);
+               dev_err(&client->dev, "%s() Err: Failed to allocate register"
+                       "map: %d\n", __func__, ret);
+               return ret;
+       }
+       i2c_set_clientdata(client, tps);
+
+       tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
+                               (pdata->vsel0_def_state & 1);
+       tps->lru_index[0] = tps->curr_vset_id;
+       tps->valid_gpios = false;
+
+       if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
+               ret = gpio_request(tps->vsel0_gpio, "tps62360-vsel0");
+               if (ret) {
+                       dev_err(&client->dev,
+                               "Err: Could not obtain vsel0 GPIO %d: %d\n",
+                                               tps->vsel0_gpio, ret);
+                       goto err_gpio0;
+               }
+               ret = gpio_direction_output(tps->vsel0_gpio,
+                                       pdata->vsel0_def_state);
+               if (ret) {
+                       dev_err(&client->dev, "Err: Could not set direction of"
+                               "vsel0 GPIO %d: %d\n", tps->vsel0_gpio, ret);
+                       gpio_free(tps->vsel0_gpio);
+                       goto err_gpio0;
+               }
+
+               ret = gpio_request(tps->vsel1_gpio, "tps62360-vsel1");
+               if (ret) {
+                       dev_err(&client->dev,
+                               "Err: Could not obtain vsel1 GPIO %d: %d\n",
+                                               tps->vsel1_gpio, ret);
+                       goto err_gpio1;
+               }
+               ret = gpio_direction_output(tps->vsel1_gpio,
+                                       pdata->vsel1_def_state);
+               if (ret) {
+                       dev_err(&client->dev, "Err: Could not set direction of"
+                               "vsel1 GPIO %d: %d\n", tps->vsel1_gpio, ret);
+                       gpio_free(tps->vsel1_gpio);
+                       goto err_gpio1;
+               }
+               tps->valid_gpios = true;
+
+               /*
+                * Initialize the lru index with vset_reg id
+                * The index 0 will be most recently used and
+                * set with the tps->curr_vset_id */
+               for (i = 0; i < 4; ++i)
+                       tps->lru_index[i] = i;
+               tps->lru_index[0] = tps->curr_vset_id;
+               tps->lru_index[tps->curr_vset_id] = 0;
+       }
+
+       ret = tps62360_init_dcdc(tps, pdata);
+       if (ret < 0) {
+               dev_err(tps->dev, "%s() Err: Init fails with = %d\n",
+                               __func__, ret);
+               goto err_init;
+       }
+
+       /* Register the regulators */
+       rdev = regulator_register(&tps->desc, &client->dev,
+                               &pdata->reg_init_data, tps, NULL);
+       if (IS_ERR(rdev)) {
+               dev_err(tps->dev, "%s() Err: Failed to register %s\n",
+                               __func__, id->name);
+               ret = PTR_ERR(rdev);
+               goto err_init;
+       }
+
+       tps->rdev = rdev;
+       return 0;
+
+err_init:
+       if (gpio_is_valid(tps->vsel1_gpio))
+               gpio_free(tps->vsel1_gpio);
+err_gpio1:
+       if (gpio_is_valid(tps->vsel0_gpio))
+               gpio_free(tps->vsel0_gpio);
+err_gpio0:
+       regmap_exit(tps->regmap);
+       return ret;
+}
+
+/**
+ * tps62360_remove - tps62360 driver i2c remove handler
+ * @client: i2c driver client device structure
+ *
+ * Unregister TPS driver as an i2c client device driver
+ */
+static int __devexit tps62360_remove(struct i2c_client *client)
+{
+       struct tps62360_chip *tps = i2c_get_clientdata(client);
+
+       if (gpio_is_valid(tps->vsel1_gpio))
+               gpio_free(tps->vsel1_gpio);
+
+       if (gpio_is_valid(tps->vsel0_gpio))
+               gpio_free(tps->vsel0_gpio);
+
+       regulator_unregister(tps->rdev);
+       regmap_exit(tps->regmap);
+       return 0;
+}
+
+static void tps62360_shutdown(struct i2c_client *client)
+{
+       struct tps62360_chip *tps = i2c_get_clientdata(client);
+       int st;
+
+       if (!tps->en_discharge)
+               return;
+
+       /* Configure the output discharge path */
+       st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
+       if (st < 0)
+               dev_err(tps->dev, "%s() fails in updating reg %d\n",
+                       __func__, REG_RAMPCTRL);
+}
+
+static const struct i2c_device_id tps62360_id[] = {
+       {.name = "tps62360", .driver_data = TPS62360},
+       {.name = "tps62361", .driver_data = TPS62361},
+       {},
+};
+
+MODULE_DEVICE_TABLE(i2c, tps62360_id);
+
+static struct i2c_driver tps62360_i2c_driver = {
+       .driver = {
+               .name = "tps62360",
+               .owner = THIS_MODULE,
+       },
+       .probe = tps62360_probe,
+       .remove = __devexit_p(tps62360_remove),
+       .shutdown = tps62360_shutdown,
+       .id_table = tps62360_id,
+};
+
+static int __init tps62360_init(void)
+{
+       return i2c_add_driver(&tps62360_i2c_driver);
+}
+subsys_initcall(tps62360_init);
+
+static void __exit tps62360_cleanup(void)
+{
+       i2c_del_driver(&tps62360_i2c_driver);
+}
+module_exit(tps62360_cleanup);
+
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_DESCRIPTION("TPS62360 voltage regulator driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/regulator/tps62360.h b/include/linux/regulator/tps62360.h
new file mode 100644 (file)
index 0000000..6a5c1b2
--- /dev/null
@@ -0,0 +1,57 @@
+/*
+ * tps62360.h -- TI tps62360
+ *
+ * Interface for regulator driver for TI TPS62360 Processor core supply
+ *
+ * Copyright (C) 2012 NVIDIA Corporation
+
+ * Author: Laxman Dewangan <ldewangan@nvidia.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.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef __LINUX_REGULATOR_TPS62360_H
+#define __LINUX_REGULATOR_TPS62360_H
+
+#include <linux/regulator/machine.h>
+
+/*
+ * struct tps62360_regulator_platform_data - tps62360 regulator platform data.
+ *
+ * @reg_init_data: The regulator init data.
+ * @en_force_pwm: Enable force pwm or not.
+ * @en_discharge: Enable discharge the output capacitor via internal
+ *                register.
+ * @en_internal_pulldn: internal pull down enable or not.
+ * @vsel0_gpio: Gpio number for vsel0. It should be -1 if this is tied with
+ *              fixed logic.
+ * @vsel1_gpio: Gpio number for vsel1. It should be -1 if this is tied with
+ *              fixed logic.
+ * @vsel0_def_state: Default state of vsel0. 1 if it is high else 0.
+ * @vsel1_def_state: Default state of vsel1. 1 if it is high else 0.
+ */
+struct tps62360_regulator_platform_data {
+       struct regulator_init_data reg_init_data;
+       bool en_force_pwm;
+       bool en_discharge;
+       bool en_internal_pulldn;
+       int vsel0_gpio;
+       int vsel1_gpio;
+       int vsel0_def_state;
+       int vsel1_def_state;
+};
+
+#endif /* __LINUX_REGULATOR_TPS62360_H */