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path: root/drivers/regulator/tps65090-regulator.c
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Diffstat (limited to 'drivers/regulator/tps65090-regulator.c')
-rw-r--r--drivers/regulator/tps65090-regulator.c533
1 files changed, 533 insertions, 0 deletions
diff --git a/drivers/regulator/tps65090-regulator.c b/drivers/regulator/tps65090-regulator.c
new file mode 100644
index 000000000..395f35dc8
--- /dev/null
+++ b/drivers/regulator/tps65090-regulator.c
@@ -0,0 +1,533 @@
+/*
+ * Regulator driver for tps65090 power management chip.
+ *
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/mfd/tps65090.h>
+
+#define MAX_CTRL_READ_TRIES 5
+#define MAX_FET_ENABLE_TRIES 1000
+
+#define CTRL_EN_BIT 0 /* Regulator enable bit, active high */
+#define CTRL_WT_BIT 2 /* Regulator wait time 0 bit */
+#define CTRL_PG_BIT 4 /* Regulator power good bit, 1=good */
+#define CTRL_TO_BIT 7 /* Regulator timeout bit, 1=wait */
+
+#define MAX_OVERCURRENT_WAIT 3 /* Overcurrent wait must be <= this */
+
+/**
+ * struct tps65090_regulator - Per-regulator data for a tps65090 regulator
+ *
+ * @dev: Pointer to our device.
+ * @desc: The struct regulator_desc for the regulator.
+ * @rdev: The struct regulator_dev for the regulator.
+ * @overcurrent_wait_valid: True if overcurrent_wait is valid.
+ * @overcurrent_wait: For FETs, the value to put in the WTFET bitfield.
+ */
+
+struct tps65090_regulator {
+ struct device *dev;
+ struct regulator_desc *desc;
+ struct regulator_dev *rdev;
+ bool overcurrent_wait_valid;
+ int overcurrent_wait;
+};
+
+static struct regulator_ops tps65090_ext_control_ops = {
+};
+
+/**
+ * tps65090_reg_set_overcurrent_wait - Setup overcurrent wait
+ *
+ * This will set the overcurrent wait time based on what's in the regulator
+ * info.
+ *
+ * @ri: Overall regulator data
+ * @rdev: Regulator device
+ *
+ * Return: 0 if no error, non-zero if there was an error writing the register.
+ */
+static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri,
+ struct regulator_dev *rdev)
+{
+ int ret;
+
+ ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+ MAX_OVERCURRENT_WAIT << CTRL_WT_BIT,
+ ri->overcurrent_wait << CTRL_WT_BIT);
+ if (ret) {
+ dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n",
+ rdev->desc->enable_reg);
+ }
+
+ return ret;
+}
+
+/**
+ * tps65090_try_enable_fet - Try to enable a FET
+ *
+ * @rdev: Regulator device
+ *
+ * Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get
+ * set, or some other -ve value if another error occurred (e.g. i2c error)
+ */
+static int tps65090_try_enable_fet(struct regulator_dev *rdev)
+{
+ unsigned int control;
+ int ret, i;
+
+ ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+ rdev->desc->enable_mask,
+ rdev->desc->enable_mask);
+ if (ret < 0) {
+ dev_err(&rdev->dev, "Error in updating reg %#x\n",
+ rdev->desc->enable_reg);
+ return ret;
+ }
+
+ for (i = 0; i < MAX_CTRL_READ_TRIES; i++) {
+ ret = regmap_read(rdev->regmap, rdev->desc->enable_reg,
+ &control);
+ if (ret < 0)
+ return ret;
+
+ if (!(control & BIT(CTRL_TO_BIT)))
+ break;
+
+ usleep_range(1000, 1500);
+ }
+ if (!(control & BIT(CTRL_PG_BIT)))
+ return -ENOTRECOVERABLE;
+
+ return 0;
+}
+
+/**
+ * tps65090_fet_enable - Enable a FET, trying a few times if it fails
+ *
+ * Some versions of the tps65090 have issues when turning on the FETs.
+ * This function goes through several steps to ensure the best chance of the
+ * FET going on. Specifically:
+ * - We'll make sure that we bump the "overcurrent wait" to the maximum, which
+ * increases the chances that we'll turn on properly.
+ * - We'll retry turning the FET on multiple times (turning off in between).
+ *
+ * @rdev: Regulator device
+ *
+ * Return: 0 if ok, non-zero if it fails.
+ */
+static int tps65090_fet_enable(struct regulator_dev *rdev)
+{
+ int ret, tries;
+
+ /*
+ * Try enabling multiple times until we succeed since sometimes the
+ * first try times out.
+ */
+ tries = 0;
+ while (true) {
+ ret = tps65090_try_enable_fet(rdev);
+ if (!ret)
+ break;
+ if (ret != -ENOTRECOVERABLE || tries == MAX_FET_ENABLE_TRIES)
+ goto err;
+
+ /* Try turning the FET off (and then on again) */
+ ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
+ rdev->desc->enable_mask, 0);
+ if (ret)
+ goto err;
+
+ tries++;
+ }
+
+ if (tries)
+ dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n",
+ rdev->desc->enable_reg, tries);
+
+ return 0;
+err:
+ dev_warn(&rdev->dev, "reg %#x enable failed\n", rdev->desc->enable_reg);
+ WARN_ON(1);
+
+ return ret;
+}
+
+static struct regulator_ops tps65090_reg_control_ops = {
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+static struct regulator_ops tps65090_fet_control_ops = {
+ .enable = tps65090_fet_enable,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+static struct regulator_ops tps65090_ldo_ops = {
+};
+
+#define tps65090_REG_DESC(_id, _sname, _en_reg, _en_bits, _nvolt, _volt, _ops) \
+{ \
+ .name = "TPS65090_RAILS"#_id, \
+ .supply_name = _sname, \
+ .id = TPS65090_REGULATOR_##_id, \
+ .n_voltages = _nvolt, \
+ .ops = &_ops, \
+ .fixed_uV = _volt, \
+ .enable_reg = _en_reg, \
+ .enable_val = _en_bits, \
+ .enable_mask = _en_bits, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+}
+
+#define tps65090_REG_FIXEDV(_id, _sname, en_reg, _en_bits, _volt, _ops) \
+ tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 1, _volt, _ops)
+
+#define tps65090_REG_SWITCH(_id, _sname, en_reg, _en_bits, _ops) \
+ tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 0, 0, _ops)
+
+static struct regulator_desc tps65090_regulator_desc[] = {
+ tps65090_REG_FIXEDV(DCDC1, "vsys1", 0x0C, BIT(CTRL_EN_BIT), 5000000,
+ tps65090_reg_control_ops),
+ tps65090_REG_FIXEDV(DCDC2, "vsys2", 0x0D, BIT(CTRL_EN_BIT), 3300000,
+ tps65090_reg_control_ops),
+ tps65090_REG_SWITCH(DCDC3, "vsys3", 0x0E, BIT(CTRL_EN_BIT),
+ tps65090_reg_control_ops),
+
+ tps65090_REG_SWITCH(FET1, "infet1", 0x0F,
+ BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
+ tps65090_fet_control_ops),
+ tps65090_REG_SWITCH(FET2, "infet2", 0x10,
+ BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
+ tps65090_fet_control_ops),
+ tps65090_REG_SWITCH(FET3, "infet3", 0x11,
+ BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
+ tps65090_fet_control_ops),
+ tps65090_REG_SWITCH(FET4, "infet4", 0x12,
+ BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
+ tps65090_fet_control_ops),
+ tps65090_REG_SWITCH(FET5, "infet5", 0x13,
+ BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
+ tps65090_fet_control_ops),
+ tps65090_REG_SWITCH(FET6, "infet6", 0x14,
+ BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
+ tps65090_fet_control_ops),
+ tps65090_REG_SWITCH(FET7, "infet7", 0x15,
+ BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
+ tps65090_fet_control_ops),
+
+ tps65090_REG_FIXEDV(LDO1, "vsys-l1", 0, 0, 5000000,
+ tps65090_ldo_ops),
+ tps65090_REG_FIXEDV(LDO2, "vsys-l2", 0, 0, 3300000,
+ tps65090_ldo_ops),
+};
+
+static inline bool is_dcdc(int id)
+{
+ switch (id) {
+ case TPS65090_REGULATOR_DCDC1:
+ case TPS65090_REGULATOR_DCDC2:
+ case TPS65090_REGULATOR_DCDC3:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static int tps65090_config_ext_control(
+ struct tps65090_regulator *ri, bool enable)
+{
+ int ret;
+ struct device *parent = ri->dev->parent;
+ unsigned int reg_en_reg = ri->desc->enable_reg;
+
+ if (enable)
+ ret = tps65090_set_bits(parent, reg_en_reg, 1);
+ else
+ ret = tps65090_clr_bits(parent, reg_en_reg, 1);
+ if (ret < 0)
+ dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
+ return ret;
+}
+
+static int tps65090_regulator_disable_ext_control(
+ struct tps65090_regulator *ri,
+ struct tps65090_regulator_plat_data *tps_pdata)
+{
+ int ret = 0;
+ struct device *parent = ri->dev->parent;
+ unsigned int reg_en_reg = ri->desc->enable_reg;
+
+ /*
+ * First enable output for internal control if require.
+ * And then disable external control.
+ */
+ if (tps_pdata->reg_init_data->constraints.always_on ||
+ tps_pdata->reg_init_data->constraints.boot_on) {
+ ret = tps65090_set_bits(parent, reg_en_reg, 0);
+ if (ret < 0) {
+ dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
+ return ret;
+ }
+ }
+ return tps65090_config_ext_control(ri, false);
+}
+
+static void tps65090_configure_regulator_config(
+ struct tps65090_regulator_plat_data *tps_pdata,
+ struct regulator_config *config)
+{
+ if (gpio_is_valid(tps_pdata->gpio)) {
+ int gpio_flag = GPIOF_OUT_INIT_LOW;
+
+ if (tps_pdata->reg_init_data->constraints.always_on ||
+ tps_pdata->reg_init_data->constraints.boot_on)
+ gpio_flag = GPIOF_OUT_INIT_HIGH;
+
+ config->ena_gpio = tps_pdata->gpio;
+ config->ena_gpio_initialized = true;
+ config->ena_gpio_flags = gpio_flag;
+ } else {
+ config->ena_gpio = -EINVAL;
+ config->ena_gpio_initialized = false;
+ }
+}
+
+#ifdef CONFIG_OF
+static struct of_regulator_match tps65090_matches[] = {
+ { .name = "dcdc1", },
+ { .name = "dcdc2", },
+ { .name = "dcdc3", },
+ { .name = "fet1", },
+ { .name = "fet2", },
+ { .name = "fet3", },
+ { .name = "fet4", },
+ { .name = "fet5", },
+ { .name = "fet6", },
+ { .name = "fet7", },
+ { .name = "ldo1", },
+ { .name = "ldo2", },
+};
+
+static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
+ struct platform_device *pdev,
+ struct of_regulator_match **tps65090_reg_matches)
+{
+ struct tps65090_platform_data *tps65090_pdata;
+ struct device_node *np = pdev->dev.parent->of_node;
+ struct device_node *regulators;
+ int idx = 0, ret;
+ struct tps65090_regulator_plat_data *reg_pdata;
+
+ tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata),
+ GFP_KERNEL);
+ if (!tps65090_pdata)
+ return ERR_PTR(-ENOMEM);
+
+ reg_pdata = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX *
+ sizeof(*reg_pdata), GFP_KERNEL);
+ if (!reg_pdata)
+ return ERR_PTR(-ENOMEM);
+
+ regulators = of_get_child_by_name(np, "regulators");
+ if (!regulators) {
+ dev_err(&pdev->dev, "regulator node not found\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
+ ARRAY_SIZE(tps65090_matches));
+ of_node_put(regulators);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "Error parsing regulator init data: %d\n", ret);
+ return ERR_PTR(ret);
+ }
+
+ *tps65090_reg_matches = tps65090_matches;
+ for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
+ struct regulator_init_data *ri_data;
+ struct tps65090_regulator_plat_data *rpdata;
+
+ rpdata = &reg_pdata[idx];
+ ri_data = tps65090_matches[idx].init_data;
+ if (!ri_data || !tps65090_matches[idx].of_node)
+ continue;
+
+ rpdata->reg_init_data = ri_data;
+ rpdata->enable_ext_control = of_property_read_bool(
+ tps65090_matches[idx].of_node,
+ "ti,enable-ext-control");
+ if (rpdata->enable_ext_control)
+ rpdata->gpio = of_get_named_gpio(np,
+ "dcdc-ext-control-gpios", 0);
+
+ if (of_property_read_u32(tps65090_matches[idx].of_node,
+ "ti,overcurrent-wait",
+ &rpdata->overcurrent_wait) == 0)
+ rpdata->overcurrent_wait_valid = true;
+
+ tps65090_pdata->reg_pdata[idx] = rpdata;
+ }
+ return tps65090_pdata;
+}
+#else
+static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
+ struct platform_device *pdev,
+ struct of_regulator_match **tps65090_reg_matches)
+{
+ *tps65090_reg_matches = NULL;
+ return NULL;
+}
+#endif
+
+static int tps65090_regulator_probe(struct platform_device *pdev)
+{
+ struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
+ struct tps65090_regulator *ri = NULL;
+ struct regulator_config config = { };
+ struct regulator_dev *rdev;
+ struct tps65090_regulator_plat_data *tps_pdata;
+ struct tps65090_regulator *pmic;
+ struct tps65090_platform_data *tps65090_pdata;
+ struct of_regulator_match *tps65090_reg_matches = NULL;
+ int num;
+ int ret;
+
+ dev_dbg(&pdev->dev, "Probing regulator\n");
+
+ tps65090_pdata = dev_get_platdata(pdev->dev.parent);
+ if (!tps65090_pdata && tps65090_mfd->dev->of_node)
+ tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
+ &tps65090_reg_matches);
+ if (IS_ERR_OR_NULL(tps65090_pdata)) {
+ dev_err(&pdev->dev, "Platform data missing\n");
+ return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
+ }
+
+ pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
+ GFP_KERNEL);
+ if (!pmic)
+ return -ENOMEM;
+
+ for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
+ tps_pdata = tps65090_pdata->reg_pdata[num];
+
+ ri = &pmic[num];
+ ri->dev = &pdev->dev;
+ ri->desc = &tps65090_regulator_desc[num];
+ if (tps_pdata) {
+ ri->overcurrent_wait_valid =
+ tps_pdata->overcurrent_wait_valid;
+ ri->overcurrent_wait = tps_pdata->overcurrent_wait;
+ }
+
+ /*
+ * TPS5090 DCDC support the control from external digital input.
+ * Configure it as per platform data.
+ */
+ if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
+ if (tps_pdata->enable_ext_control) {
+ tps65090_configure_regulator_config(
+ tps_pdata, &config);
+ ri->desc->ops = &tps65090_ext_control_ops;
+ } else {
+ ret = tps65090_regulator_disable_ext_control(
+ ri, tps_pdata);
+ if (ret < 0) {
+ dev_err(&pdev->dev,
+ "failed disable ext control\n");
+ return ret;
+ }
+ }
+ }
+
+ config.dev = pdev->dev.parent;
+ config.driver_data = ri;
+ config.regmap = tps65090_mfd->rmap;
+ if (tps_pdata)
+ config.init_data = tps_pdata->reg_init_data;
+ else
+ config.init_data = NULL;
+ if (tps65090_reg_matches)
+ config.of_node = tps65090_reg_matches[num].of_node;
+ else
+ config.of_node = NULL;
+
+ rdev = devm_regulator_register(&pdev->dev, ri->desc, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "failed to register regulator %s\n",
+ ri->desc->name);
+ return PTR_ERR(rdev);
+ }
+ ri->rdev = rdev;
+
+ if (ri->overcurrent_wait_valid) {
+ ret = tps65090_reg_set_overcurrent_wait(ri, rdev);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* Enable external control if it is require */
+ if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
+ tps_pdata->enable_ext_control) {
+ ret = tps65090_config_ext_control(ri, true);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ platform_set_drvdata(pdev, pmic);
+ return 0;
+}
+
+static struct platform_driver tps65090_regulator_driver = {
+ .driver = {
+ .name = "tps65090-pmic",
+ },
+ .probe = tps65090_regulator_probe,
+};
+
+static int __init tps65090_regulator_init(void)
+{
+ return platform_driver_register(&tps65090_regulator_driver);
+}
+subsys_initcall(tps65090_regulator_init);
+
+static void __exit tps65090_regulator_exit(void)
+{
+ platform_driver_unregister(&tps65090_regulator_driver);
+}
+module_exit(tps65090_regulator_exit);
+
+MODULE_DESCRIPTION("tps65090 regulator driver");
+MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:tps65090-pmic");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-20 00:22:03 +0000