cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tps65132-regulator.c (7859B)


      1/*
      2 * TI TPS65132 Regulator driver
      3 *
      4 * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved.
      5 *
      6 * Author: Venkat Reddy Talla <vreddytalla@nvidia.com>
      7 *		Laxman Dewangan <ldewangan@nvidia.com>
      8 *
      9 * This program is free software; you can redistribute it and/or
     10 * modify it under the terms of the GNU General Public License as
     11 * published by the Free Software Foundation; either version 2 of the
     12 * License, or (at your option) any later version.
     13 *
     14 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
     15 * whether express or implied; without even the implied warranty of
     16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     17 * General Public License for more details.
     18 */
     19
     20#include <linux/delay.h>
     21#include <linux/err.h>
     22#include <linux/gpio/consumer.h>
     23#include <linux/i2c.h>
     24#include <linux/module.h>
     25#include <linux/regmap.h>
     26#include <linux/regulator/driver.h>
     27#include <linux/regulator/machine.h>
     28
     29#define TPS65132_REG_VPOS		0x00
     30#define TPS65132_REG_VNEG		0x01
     31#define TPS65132_REG_APPS_DISP_DISN	0x03
     32#define TPS65132_REG_CONTROL		0x0FF
     33
     34#define TPS65132_VOUT_MASK		0x1F
     35#define TPS65132_VOUT_N_VOLTAGE		0x15
     36#define TPS65132_VOUT_VMIN		4000000
     37#define TPS65132_VOUT_VMAX		6000000
     38#define TPS65132_VOUT_STEP		100000
     39
     40#define TPS65132_REG_APPS_DIS_VPOS		BIT(0)
     41#define TPS65132_REG_APPS_DIS_VNEG		BIT(1)
     42
     43#define TPS65132_REGULATOR_ID_VPOS	0
     44#define TPS65132_REGULATOR_ID_VNEG	1
     45#define TPS65132_MAX_REGULATORS		2
     46
     47#define TPS65132_ACT_DIS_TIME_SLACK		1000
     48
     49struct tps65132_reg_pdata {
     50	struct gpio_desc *en_gpiod;
     51	struct gpio_desc *act_dis_gpiod;
     52	unsigned int act_dis_time_us;
     53	int ena_gpio_state;
     54};
     55
     56struct tps65132_regulator {
     57	struct device *dev;
     58	struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
     59};
     60
     61static int tps65132_regulator_enable(struct regulator_dev *rdev)
     62{
     63	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
     64	int id = rdev_get_id(rdev);
     65	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
     66	int ret;
     67
     68	if (!IS_ERR(rpdata->en_gpiod)) {
     69		gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
     70		rpdata->ena_gpio_state = 1;
     71	}
     72
     73	/* Hardware automatically enable discharge bit in enable */
     74	if (rdev->constraints->active_discharge ==
     75			REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
     76		ret = regulator_set_active_discharge_regmap(rdev, false);
     77		if (ret < 0) {
     78			dev_err(tps->dev, "Failed to disable active discharge: %d\n",
     79				ret);
     80			return ret;
     81		}
     82	}
     83
     84	return 0;
     85}
     86
     87static int tps65132_regulator_disable(struct regulator_dev *rdev)
     88{
     89	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
     90	int id = rdev_get_id(rdev);
     91	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
     92
     93	if (!IS_ERR(rpdata->en_gpiod)) {
     94		gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
     95		rpdata->ena_gpio_state = 0;
     96	}
     97
     98	if (!IS_ERR(rpdata->act_dis_gpiod)) {
     99		gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);
    100		usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +
    101			     TPS65132_ACT_DIS_TIME_SLACK);
    102		gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);
    103	}
    104
    105	return 0;
    106}
    107
    108static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
    109{
    110	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
    111	int id = rdev_get_id(rdev);
    112	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
    113
    114	if (!IS_ERR(rpdata->en_gpiod))
    115		return rpdata->ena_gpio_state;
    116
    117	return 1;
    118}
    119
    120static const struct regulator_ops tps65132_regulator_ops = {
    121	.enable = tps65132_regulator_enable,
    122	.disable = tps65132_regulator_disable,
    123	.is_enabled = tps65132_regulator_is_enabled,
    124	.list_voltage = regulator_list_voltage_linear,
    125	.map_voltage = regulator_map_voltage_linear,
    126	.get_voltage_sel = regulator_get_voltage_sel_regmap,
    127	.set_voltage_sel = regulator_set_voltage_sel_regmap,
    128	.set_active_discharge = regulator_set_active_discharge_regmap,
    129};
    130
    131static int tps65132_of_parse_cb(struct device_node *np,
    132				const struct regulator_desc *desc,
    133				struct regulator_config *config)
    134{
    135	struct tps65132_regulator *tps = config->driver_data;
    136	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];
    137	int ret;
    138
    139	rpdata->en_gpiod = devm_fwnode_gpiod_get(tps->dev, of_fwnode_handle(np),
    140						 "enable", GPIOD_ASIS,
    141						 "enable");
    142	if (IS_ERR(rpdata->en_gpiod)) {
    143		ret = PTR_ERR(rpdata->en_gpiod);
    144
    145		/* Ignore the error other than probe defer */
    146		if (ret == -EPROBE_DEFER)
    147			return ret;
    148		return 0;
    149	}
    150
    151	rpdata->act_dis_gpiod = devm_fwnode_gpiod_get(tps->dev,
    152						      of_fwnode_handle(np),
    153						      "active-discharge",
    154						      GPIOD_ASIS,
    155						      "active-discharge");
    156	if (IS_ERR(rpdata->act_dis_gpiod)) {
    157		ret = PTR_ERR(rpdata->act_dis_gpiod);
    158
    159		/* Ignore the error other than probe defer */
    160		if (ret == -EPROBE_DEFER)
    161			return ret;
    162
    163		return 0;
    164	}
    165
    166	ret = of_property_read_u32(np, "ti,active-discharge-time-us",
    167				   &rpdata->act_dis_time_us);
    168	if (ret < 0) {
    169		dev_err(tps->dev, "Failed to read active discharge time:%d\n",
    170			ret);
    171		return ret;
    172	}
    173
    174	return 0;
    175}
    176
    177#define TPS65132_REGULATOR_DESC(_id, _name)		\
    178	[TPS65132_REGULATOR_ID_##_id] = {		\
    179		.name = "tps65132-"#_name,		\
    180		.supply_name = "vin",			\
    181		.id = TPS65132_REGULATOR_ID_##_id,	\
    182		.of_match = of_match_ptr(#_name),	\
    183		.of_parse_cb	= tps65132_of_parse_cb,	\
    184		.ops = &tps65132_regulator_ops,		\
    185		.n_voltages = TPS65132_VOUT_N_VOLTAGE,	\
    186		.min_uV = TPS65132_VOUT_VMIN,		\
    187		.uV_step = TPS65132_VOUT_STEP,		\
    188		.enable_time = 500,			\
    189		.vsel_mask = TPS65132_VOUT_MASK,	\
    190		.vsel_reg = TPS65132_REG_##_id,		\
    191		.active_discharge_off = 0,			\
    192		.active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \
    193		.active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \
    194		.active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \
    195		.type = REGULATOR_VOLTAGE,		\
    196		.owner = THIS_MODULE,			\
    197	}
    198
    199static const struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {
    200	TPS65132_REGULATOR_DESC(VPOS, outp),
    201	TPS65132_REGULATOR_DESC(VNEG, outn),
    202};
    203
    204static const struct regmap_range tps65132_no_reg_ranges[] = {
    205	regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
    206			 TPS65132_REG_CONTROL - 1),
    207};
    208
    209static const struct regmap_access_table tps65132_no_reg_table = {
    210	.no_ranges = tps65132_no_reg_ranges,
    211	.n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
    212};
    213
    214static const struct regmap_config tps65132_regmap_config = {
    215	.reg_bits	= 8,
    216	.val_bits	= 8,
    217	.max_register	= TPS65132_REG_CONTROL,
    218	.cache_type	= REGCACHE_NONE,
    219	.rd_table	= &tps65132_no_reg_table,
    220	.wr_table	= &tps65132_no_reg_table,
    221};
    222
    223static int tps65132_probe(struct i2c_client *client)
    224{
    225	struct device *dev = &client->dev;
    226	struct tps65132_regulator *tps;
    227	struct regulator_dev *rdev;
    228	struct regmap *rmap;
    229	struct regulator_config config = { };
    230	int id;
    231	int ret;
    232
    233	tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
    234	if (!tps)
    235		return -ENOMEM;
    236
    237	rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
    238	if (IS_ERR(rmap)) {
    239		ret = PTR_ERR(rmap);
    240		dev_err(dev, "regmap init failed: %d\n", ret);
    241		return ret;
    242	}
    243
    244	i2c_set_clientdata(client, tps);
    245	tps->dev = dev;
    246
    247	for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
    248		config.regmap = rmap;
    249		config.dev = dev;
    250		config.driver_data = tps;
    251
    252		rdev = devm_regulator_register(dev, &tps_regs_desc[id],
    253					       &config);
    254		if (IS_ERR(rdev)) {
    255			ret = PTR_ERR(rdev);
    256			dev_err(dev, "regulator %s register failed: %d\n",
    257				tps_regs_desc[id].name, ret);
    258			return ret;
    259		}
    260	}
    261	return 0;
    262}
    263
    264static const struct i2c_device_id tps65132_id[] = {
    265	{.name = "tps65132",},
    266	{},
    267};
    268MODULE_DEVICE_TABLE(i2c, tps65132_id);
    269
    270static struct i2c_driver tps65132_i2c_driver = {
    271	.driver = {
    272		.name = "tps65132",
    273	},
    274	.probe_new = tps65132_probe,
    275	.id_table = tps65132_id,
    276};
    277
    278module_i2c_driver(tps65132_i2c_driver);
    279
    280MODULE_DESCRIPTION("tps65132 regulator driver");
    281MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
    282MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
    283MODULE_LICENSE("GPL v2");