--- /dev/null
+/*
+ * tps62360.c -- TI tps62360
+ *
+ * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
+ *
+ * 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/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.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/tps62360.h>
+#include <linux/gpio.h>
+#include <linux/i2c.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
+
+#define FORCE_PWM_ENABLE BIT(7)
+
+enum chips {TPS62360, TPS62361, TPS62362, TPS62363};
+
+#define TPS62360_BASE_VOLTAGE 770000
+#define TPS62360_N_VOLTAGES 64
+
+#define TPS62361_BASE_VOLTAGE 500000
+#define TPS62361_N_VOLTAGES 128
+
+/* tps 62360 chip information */
+struct tps62360_chip {
+ struct device *dev;
+ struct regulator_desc desc;
+ struct regulator_dev *rdev;
+ struct regmap *regmap;
+ int vsel0_gpio;
+ int vsel1_gpio;
+ u8 voltage_reg_mask;
+ bool en_internal_pulldn;
+ 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_sel(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(): register %d read failed with err %d\n",
+ __func__, REG_VSET0 + tps->curr_vset_id, ret);
+ return ret;
+ }
+ vsel = (int)data & tps->voltage_reg_mask;
+ return vsel;
+}
+
+static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
+ unsigned selector)
+{
+ struct tps62360_chip *tps = rdev_get_drvdata(dev);
+ int ret;
+ bool found = false;
+ int new_vset_id = tps->curr_vset_id;
+
+ /*
+ * 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, selector, &new_vset_id);
+
+ if (!found) {
+ ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
+ tps->voltage_reg_mask, selector);
+ if (ret < 0) {
+ dev_err(tps->dev,
+ "%s(): register %d update failed with err %d\n",
+ __func__, REG_VSET0 + new_vset_id, ret);
+ return ret;
+ }
+ tps->curr_vset_id = new_vset_id;
+ tps->curr_vset_vsel[new_vset_id] = selector;
+ }
+
+ /* 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_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ struct tps62360_chip *tps = rdev_get_drvdata(rdev);
+ int i;
+ int val;
+ int ret;
+
+ /* Enable force PWM mode in FAST mode only. */
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ val = FORCE_PWM_ENABLE;
+ break;
+
+ case REGULATOR_MODE_NORMAL:
+ val = 0;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (!tps->valid_gpios) {
+ ret = regmap_update_bits(tps->regmap,
+ REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
+ if (ret < 0)
+ dev_err(tps->dev,
+ "%s(): register %d update failed with err %d\n",
+ __func__, REG_VSET0 + tps->curr_vset_id, ret);
+ return ret;
+ }
+
+ /* If gpios are valid then all register set need to be control */
+ for (i = 0; i < 4; ++i) {
+ ret = regmap_update_bits(tps->regmap,
+ REG_VSET0 + i, FORCE_PWM_ENABLE, val);
+ if (ret < 0) {
+ dev_err(tps->dev,
+ "%s(): register %d update failed with err %d\n",
+ __func__, REG_VSET0 + i, ret);
+ return ret;
+ }
+ }
+ return ret;
+}
+
+static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
+{
+ struct tps62360_chip *tps = rdev_get_drvdata(rdev);
+ 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(): register %d read failed with err %d\n",
+ __func__, REG_VSET0 + tps->curr_vset_id, ret);
+ return ret;
+ }
+ return (data & FORCE_PWM_ENABLE) ?
+ REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
+}
+
+static struct regulator_ops tps62360_dcdc_ops = {
+ .get_voltage_sel = tps62360_dcdc_get_voltage_sel,
+ .set_voltage_sel = tps62360_dcdc_set_voltage_sel,
+ .list_voltage = regulator_list_voltage_linear,
+ .map_voltage = regulator_map_voltage_linear,
+ .set_voltage_time_sel = regulator_set_voltage_time_sel,
+ .set_mode = tps62360_set_mode,
+ .get_mode = tps62360_get_mode,
+};
+
+static int tps62360_init_dcdc(struct tps62360_chip *tps,
+ struct tps62360_regulator_platform_data *pdata)
+{
+ int ret;
+ unsigned int ramp_ctrl;
+
+ /* Initialize 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(): register %d write failed with err %d\n",
+ __func__, REG_CONTROL, ret);
+ 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(): register %d update failed with err %d\n",
+ __func__, REG_RAMPCTRL, ret);
+ return ret;
+ }
+
+ /* Get ramp value from ramp control register */
+ ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
+ if (ret < 0) {
+ dev_err(tps->dev,
+ "%s(): register %d read failed with err %d\n",
+ __func__, REG_RAMPCTRL, ret);
+ return ret;
+ }
+ ramp_ctrl = (ramp_ctrl >> 5) & 0x7;
+
+ /* ramp mV/us = 32/(2^ramp_ctrl) */
+ tps->desc.ramp_delay = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
+ return ret;
+}
+
+static const struct regmap_config tps62360_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = REG_CHIPID,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static struct tps62360_regulator_platform_data *
+ of_get_tps62360_platform_data(struct device *dev,
+ const struct regulator_desc *desc)
+{
+ struct tps62360_regulator_platform_data *pdata;
+ struct device_node *np = dev->of_node;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node,
+ desc);
+ if (!pdata->reg_init_data) {
+ dev_err(dev, "Not able to get OF regulator init data\n");
+ return NULL;
+ }
+
+ pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
+ pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);
+
+ if (of_find_property(np, "ti,vsel0-state-high", NULL))
+ pdata->vsel0_def_state = 1;
+
+ if (of_find_property(np, "ti,vsel1-state-high", NULL))
+ pdata->vsel1_def_state = 1;
+
+ if (of_find_property(np, "ti,enable-pull-down", NULL))
+ pdata->en_internal_pulldn = true;
+
+ if (of_find_property(np, "ti,enable-vout-discharge", NULL))
+ pdata->en_discharge = true;
+
+ return pdata;
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id tps62360_of_match[] = {
+ { .compatible = "ti,tps62360", .data = (void *)TPS62360},
+ { .compatible = "ti,tps62361", .data = (void *)TPS62361},
+ { .compatible = "ti,tps62362", .data = (void *)TPS62362},
+ { .compatible = "ti,tps62363", .data = (void *)TPS62363},
+ {},
+};
+MODULE_DEVICE_TABLE(of, tps62360_of_match);
+#endif
+
+static int tps62360_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct regulator_config config = { };
+ struct tps62360_regulator_platform_data *pdata;
+ struct regulator_dev *rdev;
+ struct tps62360_chip *tps;
+ int ret;
+ int i;
+ int chip_id;
+
+ pdata = dev_get_platdata(&client->dev);
+
+ tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
+ if (!tps)
+ return -ENOMEM;
+
+ tps->desc.name = client->name;
+ tps->desc.id = 0;
+ tps->desc.ops = &tps62360_dcdc_ops;
+ tps->desc.type = REGULATOR_VOLTAGE;
+ tps->desc.owner = THIS_MODULE;
+ tps->desc.uV_step = 10000;
+
+ if (client->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_device(of_match_ptr(tps62360_of_match),
+ &client->dev);
+ if (!match) {
+ dev_err(&client->dev, "Error: No device match found\n");
+ return -ENODEV;
+ }
+ chip_id = (int)(long)match->data;
+ if (!pdata)
+ pdata = of_get_tps62360_platform_data(&client->dev,
+ &tps->desc);
+ } else if (id) {
+ chip_id = id->driver_data;
+ } else {
+ dev_err(&client->dev, "No device tree match or id table match found\n");
+ return -ENODEV;
+ }
+
+ if (!pdata) {
+ dev_err(&client->dev, "%s(): Platform data not found\n",
+ __func__);
+ return -EIO;
+ }
+
+ 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->dev = &client->dev;
+
+ switch (chip_id) {
+ case TPS62360:
+ case TPS62362:
+ tps->desc.min_uV = TPS62360_BASE_VOLTAGE;
+ tps->voltage_reg_mask = 0x3F;
+ tps->desc.n_voltages = TPS62360_N_VOLTAGES;
+ break;
+ case TPS62361:
+ case TPS62363:
+ tps->desc.min_uV = TPS62361_BASE_VOLTAGE;
+ tps->voltage_reg_mask = 0x7F;
+ tps->desc.n_voltages = TPS62361_N_VOLTAGES;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
+ if (IS_ERR(tps->regmap)) {
+ ret = PTR_ERR(tps->regmap);
+ dev_err(&client->dev,
+ "%s(): regmap allocation failed with err %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)) {
+ int gpio_flags;
+ gpio_flags = (pdata->vsel0_def_state) ?
+ GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
+ ret = devm_gpio_request_one(&client->dev, tps->vsel0_gpio,
+ gpio_flags, "tps62360-vsel0");
+ if (ret) {
+ dev_err(&client->dev,
+ "%s(): Could not obtain vsel0 GPIO %d: %d\n",
+ __func__, tps->vsel0_gpio, ret);
+ return ret;
+ }
+
+ gpio_flags = (pdata->vsel1_def_state) ?
+ GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
+ ret = devm_gpio_request_one(&client->dev, tps->vsel1_gpio,
+ gpio_flags, "tps62360-vsel1");
+ if (ret) {
+ dev_err(&client->dev,
+ "%s(): Could not obtain vsel1 GPIO %d: %d\n",
+ __func__, tps->vsel1_gpio, ret);
+ return ret;
+ }
+ 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(): Init failed with err = %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ config.dev = &client->dev;
+ config.init_data = pdata->reg_init_data;
+ config.driver_data = tps;
+ config.of_node = client->dev.of_node;
+
+ /* Register the regulators */
+ rdev = devm_regulator_register(&client->dev, &tps->desc, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(tps->dev,
+ "%s(): regulator register failed with err %s\n",
+ __func__, id->name);
+ return PTR_ERR(rdev);
+ }
+
+ tps->rdev = rdev;
+ 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(): register %d update failed with err %d\n",
+ __func__, REG_RAMPCTRL, st);
+}
+
+static const struct i2c_device_id tps62360_id[] = {
+ {.name = "tps62360", .driver_data = TPS62360},
+ {.name = "tps62361", .driver_data = TPS62361},
+ {.name = "tps62362", .driver_data = TPS62362},
+ {.name = "tps62363", .driver_data = TPS62363},
+ {},
+};
+
+MODULE_DEVICE_TABLE(i2c, tps62360_id);
+
+static struct i2c_driver tps62360_i2c_driver = {
+ .driver = {
+ .name = "tps62360",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(tps62360_of_match),
+ },
+ .probe = tps62360_probe,
+ .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("TPS6236x voltage regulator driver");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff