diff options
author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/regulator/tps65090-regulator.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/regulator/tps65090-regulator.c')
-rw-r--r-- | kernel/drivers/regulator/tps65090-regulator.c | 533 |
1 files changed, 533 insertions, 0 deletions
diff --git a/kernel/drivers/regulator/tps65090-regulator.c b/kernel/drivers/regulator/tps65090-regulator.c new file mode 100644 index 000000000..395f35dc8 --- /dev/null +++ b/kernel/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 = ®_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"); |