--- /dev/null
+/*
+ * tps51632-regulator.c -- TI TPS51632
+ *
+ * Regulator driver for TPS51632 3-2-1 Phase D-Cap Step Down Driverless
+ * Controller with serial VID control and DVFS.
+ *
+ * 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/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/tps51632-regulator.h>
+#include <linux/slab.h>
+
+/* Register definitions */
+#define TPS51632_VOLTAGE_SELECT_REG 0x0
+#define TPS51632_VOLTAGE_BASE_REG 0x1
+#define TPS51632_OFFSET_REG 0x2
+#define TPS51632_IMON_REG 0x3
+#define TPS51632_VMAX_REG 0x4
+#define TPS51632_DVFS_CONTROL_REG 0x5
+#define TPS51632_POWER_STATE_REG 0x6
+#define TPS51632_SLEW_REGS 0x7
+#define TPS51632_FAULT_REG 0x14
+
+#define TPS51632_MAX_REG 0x15
+
+#define TPS51632_VOUT_MASK 0x7F
+#define TPS51632_VOUT_OFFSET_MASK 0x1F
+#define TPS51632_VMAX_MASK 0x7F
+#define TPS51632_VMAX_LOCK 0x80
+
+/* TPS51632_DVFS_CONTROL_REG */
+#define TPS51632_DVFS_PWMEN 0x1
+#define TPS51632_DVFS_STEP_20 0x2
+#define TPS51632_DVFS_VMAX_PG 0x4
+#define TPS51632_DVFS_PWMRST 0x8
+#define TPS51632_DVFS_OCA_EN 0x10
+#define TPS51632_DVFS_FCCM 0x20
+
+/* TPS51632_POWER_STATE_REG */
+#define TPS51632_POWER_STATE_MASK 0x03
+#define TPS51632_POWER_STATE_MULTI_PHASE_CCM 0x0
+#define TPS51632_POWER_STATE_SINGLE_PHASE_CCM 0x1
+#define TPS51632_POWER_STATE_SINGLE_PHASE_DCM 0x2
+
+#define TPS51632_MIN_VOLATGE 500000
+#define TPS51632_MAX_VOLATGE 1520000
+#define TPS51632_VOLATGE_STEP_10mV 10000
+#define TPS51632_VOLATGE_STEP_20mV 20000
+#define TPS51632_MAX_VSEL 0x7F
+#define TPS51632_MIN_VSEL 0x19
+#define TPS51632_DEFAULT_RAMP_DELAY 6000
+#define TPS51632_VOLT_VSEL(uV) \
+ (DIV_ROUND_UP(uV - TPS51632_MIN_VOLATGE, \
+ TPS51632_VOLATGE_STEP_10mV) + \
+ TPS51632_MIN_VSEL)
+
+/* TPS51632 chip information */
+struct tps51632_chip {
+ struct device *dev;
+ struct regulator_desc desc;
+ struct regulator_dev *rdev;
+ struct regmap *regmap;
+ bool enable_pwm_dvfs;
+};
+
+static int tps51632_dcdc_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct tps51632_chip *tps = rdev_get_drvdata(rdev);
+ unsigned int data;
+ int ret;
+ unsigned int reg = TPS51632_VOLTAGE_SELECT_REG;
+ int vsel;
+
+ if (tps->enable_pwm_dvfs)
+ reg = TPS51632_VOLTAGE_BASE_REG;
+
+ ret = regmap_read(tps->regmap, reg, &data);
+ if (ret < 0) {
+ dev_err(tps->dev, "reg read failed, err %d\n", ret);
+ return ret;
+ }
+
+ vsel = data & TPS51632_VOUT_MASK;
+
+ if (vsel < TPS51632_MIN_VSEL)
+ return 0;
+ else
+ return vsel - TPS51632_MIN_VSEL;
+}
+
+static int tps51632_dcdc_set_voltage_sel(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ struct tps51632_chip *tps = rdev_get_drvdata(rdev);
+ int vsel;
+ int ret;
+ unsigned int reg = TPS51632_VOLTAGE_SELECT_REG;
+
+ if (tps->enable_pwm_dvfs)
+ reg = TPS51632_VOLTAGE_BASE_REG;
+
+ vsel = selector + TPS51632_MIN_VSEL;
+ if (vsel > TPS51632_MAX_VSEL)
+ return -EINVAL;
+
+ ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_SELECT_REG, vsel);
+ if (ret < 0)
+ dev_err(tps->dev, "reg write failed, err %d\n", ret);
+ return ret;
+}
+
+static int tps51632_dcdc_set_ramp_delay(struct regulator_dev *rdev,
+ int ramp_delay)
+{
+ struct tps51632_chip *tps = rdev_get_drvdata(rdev);
+ int bit = ramp_delay/6000;
+ int ret;
+
+ if (bit)
+ bit--;
+ ret = regmap_write(tps->regmap, TPS51632_SLEW_REGS, BIT(bit));
+ if (ret < 0)
+ dev_err(tps->dev, "SLEW reg write failed, err %d\n", ret);
+ return ret;
+}
+
+static struct regulator_ops tps51632_dcdc_ops = {
+ .get_voltage_sel = tps51632_dcdc_get_voltage_sel,
+ .set_voltage_sel = tps51632_dcdc_set_voltage_sel,
+ .list_voltage = regulator_list_voltage_linear,
+ .set_voltage_time_sel = regulator_set_voltage_time_sel,
+ .set_ramp_delay = tps51632_dcdc_set_ramp_delay,
+};
+
+static int __devinit tps51632_init_dcdc(struct tps51632_chip *tps,
+ struct tps51632_regulator_platform_data *pdata)
+{
+ int ret;
+ uint8_t control = 0;
+ int vsel;
+
+ if (!pdata->enable_pwm_dvfs)
+ goto skip_pwm_config;
+
+ control |= TPS51632_DVFS_PWMEN;
+ tps->enable_pwm_dvfs = pdata->enable_pwm_dvfs;
+ vsel = TPS51632_VOLT_VSEL(pdata->base_voltage_uV);
+ ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_BASE_REG, vsel);
+ if (ret < 0) {
+ dev_err(tps->dev, "BASE reg write failed, err %d\n", ret);
+ return ret;
+ }
+
+ if (pdata->dvfs_step_20mV)
+ control |= TPS51632_DVFS_STEP_20;
+
+ if (pdata->max_voltage_uV) {
+ unsigned int vmax;
+ /**
+ * TPS51632 hw behavior: VMAX register can be write only
+ * once as it get locked after first write. The lock get
+ * reset only when device is power-reset.
+ * Write register only when lock bit is not enabled.
+ */
+ ret = regmap_read(tps->regmap, TPS51632_VMAX_REG, &vmax);
+ if (ret < 0) {
+ dev_err(tps->dev, "VMAX read failed, err %d\n", ret);
+ return ret;
+ }
+ if (!(vmax & TPS51632_VMAX_LOCK)) {
+ vsel = TPS51632_VOLT_VSEL(pdata->max_voltage_uV);
+ ret = regmap_write(tps->regmap, TPS51632_VMAX_REG,
+ vsel);
+ if (ret < 0) {
+ dev_err(tps->dev,
+ "VMAX write failed, err %d\n", ret);
+ return ret;
+ }
+ }
+ }
+
+skip_pwm_config:
+ ret = regmap_write(tps->regmap, TPS51632_DVFS_CONTROL_REG, control);
+ if (ret < 0)
+ dev_err(tps->dev, "DVFS reg write failed, err %d\n", ret);
+ return ret;
+}
+
+static bool rd_wr_reg(struct device *dev, unsigned int reg)
+{
+ if ((reg >= 0x8) && (reg <= 0x10))
+ return false;
+ return true;
+}
+
+static const struct regmap_config tps51632_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .writeable_reg = rd_wr_reg,
+ .readable_reg = rd_wr_reg,
+ .max_register = TPS51632_MAX_REG - 1,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static int __devinit tps51632_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tps51632_regulator_platform_data *pdata;
+ struct regulator_dev *rdev;
+ struct tps51632_chip *tps;
+ int ret;
+ struct regulator_config config = { };
+
+ pdata = client->dev.platform_data;
+ if (!pdata) {
+ dev_err(&client->dev, "No Platform data\n");
+ return -EINVAL;
+ }
+
+ tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
+ if (!tps) {
+ dev_err(&client->dev, "Memory allocation failed\n");
+ return -ENOMEM;
+ }
+
+ tps->dev = &client->dev;
+ tps->desc.name = id->name;
+ tps->desc.id = 0;
+ tps->desc.ramp_delay = TPS51632_DEFAULT_RAMP_DELAY;
+ tps->desc.min_uV = TPS51632_MIN_VOLATGE;
+ tps->desc.uV_step = TPS51632_VOLATGE_STEP_10mV;
+ tps->desc.n_voltages = (TPS51632_MAX_VSEL - TPS51632_MIN_VSEL) + 1;
+ tps->desc.ops = &tps51632_dcdc_ops;
+ tps->desc.type = REGULATOR_VOLTAGE;
+ tps->desc.owner = THIS_MODULE;
+
+ tps->regmap = devm_regmap_init_i2c(client, &tps51632_regmap_config);
+ if (IS_ERR(tps->regmap)) {
+ ret = PTR_ERR(tps->regmap);
+ dev_err(&client->dev, "regmap init failed, err %d\n", ret);
+ return ret;
+ }
+ i2c_set_clientdata(client, tps);
+
+ ret = tps51632_init_dcdc(tps, pdata);
+ if (ret < 0) {
+ dev_err(tps->dev, "Init failed, err = %d\n", ret);
+ return ret;
+ }
+
+ /* Register the regulators */
+ config.dev = &client->dev;
+ config.init_data = pdata->reg_init_data;
+ config.driver_data = tps;
+ config.regmap = tps->regmap;
+ config.of_node = client->dev.of_node;
+
+ rdev = regulator_register(&tps->desc, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(tps->dev, "regulator register failed\n");
+ return PTR_ERR(rdev);
+ }
+
+ tps->rdev = rdev;
+ return 0;
+}
+
+static int __devexit tps51632_remove(struct i2c_client *client)
+{
+ struct tps51632_chip *tps = i2c_get_clientdata(client);
+
+ regulator_unregister(tps->rdev);
+ return 0;
+}
+
+static const struct i2c_device_id tps51632_id[] = {
+ {.name = "tps51632",},
+ {},
+};
+
+MODULE_DEVICE_TABLE(i2c, tps51632_id);
+
+static struct i2c_driver tps51632_i2c_driver = {
+ .driver = {
+ .name = "tps51632",
+ .owner = THIS_MODULE,
+ },
+ .probe = tps51632_probe,
+ .remove = __devexit_p(tps51632_remove),
+ .id_table = tps51632_id,
+};
+
+static int __init tps51632_init(void)
+{
+ return i2c_add_driver(&tps51632_i2c_driver);
+}
+subsys_initcall(tps51632_init);
+
+static void __exit tps51632_cleanup(void)
+{
+ i2c_del_driver(&tps51632_i2c_driver);
+}
+module_exit(tps51632_cleanup);
+
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_DESCRIPTION("TPS51632 voltage regulator driver");
+MODULE_LICENSE("GPL v2");
projects / mirror_ubuntu-artful-kernel.git / commitdiff