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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tps6286x-regulator.c (3981B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2// Copyright Axis Communications AB
      3
      4#include <linux/err.h>
      5#include <linux/i2c.h>
      6#include <linux/module.h>
      7#include <linux/of_device.h>
      8#include <linux/regmap.h>
      9#include <linux/regulator/of_regulator.h>
     10#include <linux/regulator/machine.h>
     11#include <linux/regulator/driver.h>
     12
     13#include <dt-bindings/regulator/ti,tps62864.h>
     14
     15#define TPS6286X_VOUT1		0x01
     16#define TPS6286X_VOUT1_VO1_SET	GENMASK(7, 0)
     17
     18#define TPS6286X_CONTROL	0x03
     19#define TPS6286X_CONTROL_FPWM	BIT(4)
     20#define TPS6286X_CONTROL_SWEN	BIT(5)
     21
     22#define TPS6286X_MIN_MV		400
     23#define TPS6286X_MAX_MV		1675
     24#define TPS6286X_STEP_MV	5
     25
     26static const struct regmap_config tps6286x_regmap_config = {
     27	.reg_bits = 8,
     28	.val_bits = 8,
     29};
     30
     31static int tps6286x_set_mode(struct regulator_dev *rdev, unsigned int mode)
     32{
     33	unsigned int val;
     34
     35	switch (mode) {
     36	case REGULATOR_MODE_NORMAL:
     37		val = 0;
     38		break;
     39	case REGULATOR_MODE_FAST:
     40		val = TPS6286X_CONTROL_FPWM;
     41		break;
     42	default:
     43		return -EINVAL;
     44	}
     45
     46	return regmap_update_bits(rdev->regmap, TPS6286X_CONTROL,
     47				  TPS6286X_CONTROL_FPWM, val);
     48}
     49
     50static unsigned int tps6286x_get_mode(struct regulator_dev *rdev)
     51{
     52	unsigned int val;
     53	int ret;
     54
     55	ret = regmap_read(rdev->regmap, TPS6286X_CONTROL, &val);
     56	if (ret < 0)
     57		return 0;
     58
     59	return (val & TPS6286X_CONTROL_FPWM) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
     60}
     61
     62static const struct regulator_ops tps6286x_regulator_ops = {
     63	.enable = regulator_enable_regmap,
     64	.disable = regulator_disable_regmap,
     65	.set_mode = tps6286x_set_mode,
     66	.get_mode = tps6286x_get_mode,
     67	.is_enabled = regulator_is_enabled_regmap,
     68	.set_voltage_sel = regulator_set_voltage_sel_regmap,
     69	.get_voltage_sel = regulator_get_voltage_sel_regmap,
     70	.list_voltage = regulator_list_voltage_linear,
     71};
     72
     73static unsigned int tps6286x_of_map_mode(unsigned int mode)
     74{
     75	switch (mode) {
     76	case TPS62864_MODE_NORMAL:
     77		return REGULATOR_MODE_NORMAL;
     78	case TPS62864_MODE_FPWM:
     79		return REGULATOR_MODE_FAST;
     80	default:
     81		return REGULATOR_MODE_INVALID;
     82	}
     83}
     84
     85static const struct regulator_desc tps6286x_reg = {
     86	.name = "tps6286x",
     87	.of_match = of_match_ptr("SW"),
     88	.owner = THIS_MODULE,
     89	.ops = &tps6286x_regulator_ops,
     90	.of_map_mode = tps6286x_of_map_mode,
     91	.regulators_node = of_match_ptr("regulators"),
     92	.type = REGULATOR_VOLTAGE,
     93	.n_voltages = ((TPS6286X_MAX_MV - TPS6286X_MIN_MV) / TPS6286X_STEP_MV) + 1,
     94	.min_uV = TPS6286X_MIN_MV * 1000,
     95	.uV_step = TPS6286X_STEP_MV * 1000,
     96	.vsel_reg = TPS6286X_VOUT1,
     97	.vsel_mask = TPS6286X_VOUT1_VO1_SET,
     98	.enable_reg = TPS6286X_CONTROL,
     99	.enable_mask = TPS6286X_CONTROL_SWEN,
    100	.ramp_delay = 1000,
    101	/* tDelay + tRamp, rounded up */
    102	.enable_time = 3000,
    103};
    104
    105static const struct of_device_id tps6286x_dt_ids[] = {
    106	{ .compatible = "ti,tps62864", },
    107	{ .compatible = "ti,tps62866", },
    108	{ .compatible = "ti,tps62868", },
    109	{ .compatible = "ti,tps62869", },
    110	{ }
    111};
    112MODULE_DEVICE_TABLE(of, tps6286x_dt_ids);
    113
    114static int tps6286x_i2c_probe(struct i2c_client *i2c,
    115			    const struct i2c_device_id *id)
    116{
    117	struct device *dev = &i2c->dev;
    118	struct regulator_config config = {};
    119	struct regulator_dev *rdev;
    120	struct regmap *regmap;
    121
    122	regmap = devm_regmap_init_i2c(i2c, &tps6286x_regmap_config);
    123	if (IS_ERR(regmap))
    124		return PTR_ERR(regmap);
    125
    126	config.dev = &i2c->dev;
    127	config.of_node = dev->of_node;
    128	config.regmap = regmap;
    129
    130	rdev = devm_regulator_register(&i2c->dev, &tps6286x_reg, &config);
    131	if (IS_ERR(rdev)) {
    132		dev_err(&i2c->dev, "Failed to register tps6286x regulator\n");
    133		return PTR_ERR(rdev);
    134	}
    135
    136	return 0;
    137}
    138
    139static const struct i2c_device_id tps6286x_i2c_id[] = {
    140	{ "tps62864", 0 },
    141	{ "tps62866", 0 },
    142	{ "tps62868", 0 },
    143	{ "tps62869", 0 },
    144	{},
    145};
    146MODULE_DEVICE_TABLE(i2c, tps6286x_i2c_id);
    147
    148static struct i2c_driver tps6286x_regulator_driver = {
    149	.driver = {
    150		.name = "tps6286x",
    151		.of_match_table = of_match_ptr(tps6286x_dt_ids),
    152	},
    153	.probe = tps6286x_i2c_probe,
    154	.id_table = tps6286x_i2c_id,
    155};
    156
    157module_i2c_driver(tps6286x_regulator_driver);
    158
    159MODULE_LICENSE("GPL v2");