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kernel/drivers/regulator/mcp16502.c

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// SPDX-License-Identifier: GPL-2.0
//
// MCP16502 PMIC driver
//
// Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries
//
// Author: Andrei Stefanescu <andrei.stefanescu@microchip.com>
//
// Inspired from tps65086-regulator.c
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/suspend.h>
#include <linux/gpio/consumer.h>
#define VDD_LOW_SEL 0x0D
#define VDD_HIGH_SEL 0x3F
#define MCP16502_FLT BIT(7)
#define MCP16502_DVSR GENMASK(3, 2)
#define MCP16502_ENS BIT(0)
/*
* The PMIC has four sets of registers corresponding to four power modes:
* Performance, Active, Low-power, Hibernate.
*
* Registers:
* Each regulator has a register for each power mode. To access a register
* for a specific regulator and mode BASE_* and OFFSET_* need to be added.
*
* Operating modes:
* In order for the PMIC to transition to operating modes it has to be
* controlled via GPIO lines called LPM and HPM.
*
* The registers are fully configurable such that you can put all regulators in
* a low-power state while the PMIC is in Active mode. They are supposed to be
* configured at startup and then simply transition to/from a global low-power
* state by setting the GPIO lpm pin high/low.
*
* This driver keeps the PMIC in Active mode, Low-power state is set for the
* regulators by enabling/disabling operating mode (FPWM or Auto PFM).
*
* The PMIC's Low-power and Hibernate modes are used during standby/suspend.
* To enter standby/suspend the PMIC will go to Low-power mode. From there, it
* will transition to Hibernate when the PWRHLD line is set to low by the MPU.
*/
/*
* This function is useful for iterating over all regulators and accessing their
* registers in a generic way or accessing a regulator device by its id.
*/
#define MCP16502_REG_BASE(i, r) ((((i) + 1) << 4) + MCP16502_REG_##r)
#define MCP16502_STAT_BASE(i) ((i) + 5)
#define MCP16502_OPMODE_ACTIVE REGULATOR_MODE_NORMAL
#define MCP16502_OPMODE_LPM REGULATOR_MODE_IDLE
#define MCP16502_OPMODE_HIB REGULATOR_MODE_STANDBY
#define MCP16502_MODE_AUTO_PFM 0
#define MCP16502_MODE_FPWM BIT(6)
#define MCP16502_VSEL 0x3F
#define MCP16502_EN BIT(7)
#define MCP16502_MODE BIT(6)
#define MCP16502_MIN_REG 0x0
#define MCP16502_MAX_REG 0x65
/**
* enum mcp16502_reg - MCP16502 regulators's registers
* @MCP16502_REG_A: active state register
* @MCP16502_REG_LPM: low power mode state register
* @MCP16502_REG_HIB: hibernate state register
* @MCP16502_REG_HPM: high-performance mode register
* @MCP16502_REG_SEQ: startup sequence register
* @MCP16502_REG_CFG: configuration register
*/
enum mcp16502_reg {
MCP16502_REG_A,
MCP16502_REG_LPM,
MCP16502_REG_HIB,
MCP16502_REG_HPM,
MCP16502_REG_SEQ,
MCP16502_REG_CFG,
};
/* Ramp delay (uV/us) for buck1, ldo1, ldo2. */
static const unsigned int mcp16502_ramp_b1l12[] = {
6250, 3125, 2083, 1563
};
/* Ramp delay (uV/us) for buck2, buck3, buck4. */
static const unsigned int mcp16502_ramp_b234[] = {
3125, 1563, 1042, 781
};
static unsigned int mcp16502_of_map_mode(unsigned int mode)
{
if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)
return mode;
return REGULATOR_MODE_INVALID;
}
#define MCP16502_REGULATOR(_name, _id, _ranges, _ops, _ramp_table) \
[_id] = { \
.name = _name, \
.regulators_node = of_match_ptr("regulators"), \
.id = _id, \
.ops = &(_ops), \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.n_voltages = MCP16502_VSEL + 1, \
.linear_ranges = _ranges, \
.linear_min_sel = VDD_LOW_SEL, \
.n_linear_ranges = ARRAY_SIZE(_ranges), \
.of_match = of_match_ptr(_name), \
.of_map_mode = mcp16502_of_map_mode, \
.vsel_reg = (((_id) + 1) << 4), \
.vsel_mask = MCP16502_VSEL, \
.enable_reg = (((_id) + 1) << 4), \
.enable_mask = MCP16502_EN, \
.ramp_reg = MCP16502_REG_BASE(_id, CFG), \
.ramp_mask = MCP16502_DVSR, \
.ramp_delay_table = _ramp_table, \
.n_ramp_values = ARRAY_SIZE(_ramp_table), \
}
enum {
BUCK1 = 0,
BUCK2,
BUCK3,
BUCK4,
LDO1,
LDO2,
NUM_REGULATORS
};
/*
* struct mcp16502 - PMIC representation
* @lpm: LPM GPIO descriptor
*/
struct mcp16502 {
struct gpio_desc *lpm;
};
/*
* mcp16502_gpio_set_mode() - set the GPIO corresponding value
*
* Used to prepare transitioning into hibernate or resuming from it.
*/
static void mcp16502_gpio_set_mode(struct mcp16502 *mcp, int mode)
{
switch (mode) {
case MCP16502_OPMODE_ACTIVE:
gpiod_set_value(mcp->lpm, 0);
break;
case MCP16502_OPMODE_LPM:
case MCP16502_OPMODE_HIB:
gpiod_set_value(mcp->lpm, 1);
break;
default:
pr_err("%s: %d invalid\n", __func__, mode);
}
}
/*
* mcp16502_get_reg() - get the PMIC's state configuration register for opmode
*
* @rdev: the regulator whose register we are searching
* @opmode: the PMIC's operating mode ACTIVE, Low-power, Hibernate
*/
static int mcp16502_get_state_reg(struct regulator_dev *rdev, int opmode)
{
switch (opmode) {
case MCP16502_OPMODE_ACTIVE:
return MCP16502_REG_BASE(rdev_get_id(rdev), A);
case MCP16502_OPMODE_LPM:
return MCP16502_REG_BASE(rdev_get_id(rdev), LPM);
case MCP16502_OPMODE_HIB:
return MCP16502_REG_BASE(rdev_get_id(rdev), HIB);
default:
return -EINVAL;
}
}
/*
* mcp16502_get_mode() - return the current operating mode of a regulator
*
* Note: all functions that are not part of entering/exiting standby/suspend
* use the Active mode registers.
*
* Note: this is different from the PMIC's operatig mode, it is the
* MODE bit from the regulator's register.
*/
static unsigned int mcp16502_get_mode(struct regulator_dev *rdev)
{
unsigned int val;
int ret, reg;
reg = mcp16502_get_state_reg(rdev, MCP16502_OPMODE_ACTIVE);
if (reg < 0)
return reg;
ret = regmap_read(rdev->regmap, reg, &val);
if (ret)
return ret;
switch (val & MCP16502_MODE) {
case MCP16502_MODE_FPWM:
return REGULATOR_MODE_NORMAL;
case MCP16502_MODE_AUTO_PFM:
return REGULATOR_MODE_IDLE;
default:
return REGULATOR_MODE_INVALID;
}
}
/*
* _mcp16502_set_mode() - helper for set_mode and set_suspend_mode
*
* @rdev: the regulator for which we are setting the mode
* @mode: the regulator's mode (the one from MODE bit)
* @opmode: the PMIC's operating mode: Active/Low-power/Hibernate
*/
static int _mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode,
unsigned int op_mode)
{
int val;
int reg;
reg = mcp16502_get_state_reg(rdev, op_mode);
if (reg < 0)
return reg;
switch (mode) {
case REGULATOR_MODE_NORMAL:
val = MCP16502_MODE_FPWM;
break;
case REGULATOR_MODE_IDLE:
val = MCP16502_MODE_AUTO_PFM;
break;
default:
return -EINVAL;
}
reg = regmap_update_bits(rdev->regmap, reg, MCP16502_MODE, val);
return reg;
}
/*
* mcp16502_set_mode() - regulator_ops set_mode
*/
static int mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_ACTIVE);
}
/*
* mcp16502_get_status() - regulator_ops get_status
*/
static int mcp16502_get_status(struct regulator_dev *rdev)
{
int ret;
unsigned int val;
ret = regmap_read(rdev->regmap, MCP16502_STAT_BASE(rdev_get_id(rdev)),
&val);
if (ret)
return ret;
if (val & MCP16502_FLT)
return REGULATOR_STATUS_ERROR;
else if (val & MCP16502_ENS)
return REGULATOR_STATUS_ON;
else if (!(val & MCP16502_ENS))
return REGULATOR_STATUS_OFF;
return REGULATOR_STATUS_UNDEFINED;
}
static int mcp16502_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_sel,
unsigned int new_sel)
{
static const u8 us_ramp[] = { 8, 16, 24, 32 };
int id = rdev_get_id(rdev);
unsigned int uV_delta, val;
int ret;
ret = regmap_read(rdev->regmap, MCP16502_REG_BASE(id, CFG), &val);
if (ret)
return ret;
val = (val & MCP16502_DVSR) >> 2;
uV_delta = abs(new_sel * rdev->desc->linear_ranges->step -
old_sel * rdev->desc->linear_ranges->step);
switch (id) {
case BUCK1:
case LDO1:
case LDO2:
ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
mcp16502_ramp_b1l12[val]);
break;
case BUCK2:
case BUCK3:
case BUCK4:
ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
mcp16502_ramp_b234[val]);
break;
default:
return -EINVAL;
}
return ret;
}
#ifdef CONFIG_SUSPEND
/*
* mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC
* mode
*/
static int mcp16502_suspend_get_target_reg(struct regulator_dev *rdev)
{
switch (pm_suspend_target_state) {
case PM_SUSPEND_STANDBY:
return mcp16502_get_state_reg(rdev, MCP16502_OPMODE_LPM);
case PM_SUSPEND_ON:
case PM_SUSPEND_MEM:
return mcp16502_get_state_reg(rdev, MCP16502_OPMODE_HIB);
default:
dev_err(&rdev->dev, "invalid suspend target: %d\n",
pm_suspend_target_state);
}
return -EINVAL;
}
/*
* mcp16502_set_suspend_voltage() - regulator_ops set_suspend_voltage
*/
static int mcp16502_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
int sel = regulator_map_voltage_linear_range(rdev, uV, uV);
int reg = mcp16502_suspend_get_target_reg(rdev);
if (sel < 0)
return sel;
if (reg < 0)
return reg;
return regmap_update_bits(rdev->regmap, reg, MCP16502_VSEL, sel);
}
/*
* mcp16502_set_suspend_mode() - regulator_ops set_suspend_mode
*/
static int mcp16502_set_suspend_mode(struct regulator_dev *rdev,
unsigned int mode)
{
switch (pm_suspend_target_state) {
case PM_SUSPEND_STANDBY:
return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_LPM);
case PM_SUSPEND_ON:
case PM_SUSPEND_MEM:
return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_HIB);
default:
dev_err(&rdev->dev, "invalid suspend target: %d\n",
pm_suspend_target_state);
}
return -EINVAL;
}
/*
* mcp16502_set_suspend_enable() - regulator_ops set_suspend_enable
*/
static int mcp16502_set_suspend_enable(struct regulator_dev *rdev)
{
int reg = mcp16502_suspend_get_target_reg(rdev);
if (reg < 0)
return reg;
return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, MCP16502_EN);
}
/*
* mcp16502_set_suspend_disable() - regulator_ops set_suspend_disable
*/
static int mcp16502_set_suspend_disable(struct regulator_dev *rdev)
{
int reg = mcp16502_suspend_get_target_reg(rdev);
if (reg < 0)
return reg;
return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, 0);
}
#endif /* CONFIG_SUSPEND */
static const struct regulator_ops mcp16502_buck_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_status = mcp16502_get_status,
.set_voltage_time_sel = mcp16502_set_voltage_time_sel,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.set_mode = mcp16502_set_mode,
.get_mode = mcp16502_get_mode,
#ifdef CONFIG_SUSPEND
.set_suspend_voltage = mcp16502_set_suspend_voltage,
.set_suspend_mode = mcp16502_set_suspend_mode,
.set_suspend_enable = mcp16502_set_suspend_enable,
.set_suspend_disable = mcp16502_set_suspend_disable,
#endif /* CONFIG_SUSPEND */
};
/*
* LDOs cannot change operating modes.
*/
static const struct regulator_ops mcp16502_ldo_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_status = mcp16502_get_status,
.set_voltage_time_sel = mcp16502_set_voltage_time_sel,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
#ifdef CONFIG_SUSPEND
.set_suspend_voltage = mcp16502_set_suspend_voltage,
.set_suspend_enable = mcp16502_set_suspend_enable,
.set_suspend_disable = mcp16502_set_suspend_disable,
#endif /* CONFIG_SUSPEND */
};
static const struct of_device_id mcp16502_ids[] = {
{ .compatible = "microchip,mcp16502", },
{}
};
MODULE_DEVICE_TABLE(of, mcp16502_ids);
static const struct linear_range b1l12_ranges[] = {
REGULATOR_LINEAR_RANGE(1200000, VDD_LOW_SEL, VDD_HIGH_SEL, 50000),
};
static const struct linear_range b234_ranges[] = {
REGULATOR_LINEAR_RANGE(600000, VDD_LOW_SEL, VDD_HIGH_SEL, 25000),
};
static const struct regulator_desc mcp16502_desc[] = {
/* MCP16502_REGULATOR(_name, _id, ranges, regulator_ops, ramp_table) */
MCP16502_REGULATOR("VDD_IO", BUCK1, b1l12_ranges, mcp16502_buck_ops,
mcp16502_ramp_b1l12),
MCP16502_REGULATOR("VDD_DDR", BUCK2, b234_ranges, mcp16502_buck_ops,
mcp16502_ramp_b234),
MCP16502_REGULATOR("VDD_CORE", BUCK3, b234_ranges, mcp16502_buck_ops,
mcp16502_ramp_b234),
MCP16502_REGULATOR("VDD_OTHER", BUCK4, b234_ranges, mcp16502_buck_ops,
mcp16502_ramp_b234),
MCP16502_REGULATOR("LDO1", LDO1, b1l12_ranges, mcp16502_ldo_ops,
mcp16502_ramp_b1l12),
MCP16502_REGULATOR("LDO2", LDO2, b1l12_ranges, mcp16502_ldo_ops,
mcp16502_ramp_b1l12)
};
static const struct regmap_range mcp16502_ranges[] = {
regmap_reg_range(MCP16502_MIN_REG, MCP16502_MAX_REG)
};
static const struct regmap_access_table mcp16502_yes_reg_table = {
.yes_ranges = mcp16502_ranges,
.n_yes_ranges = ARRAY_SIZE(mcp16502_ranges),
};
static const struct regmap_config mcp16502_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MCP16502_MAX_REG,
.cache_type = REGCACHE_NONE,
.rd_table = &mcp16502_yes_reg_table,
.wr_table = &mcp16502_yes_reg_table,
};
static int mcp16502_probe(struct i2c_client *client)
{
struct regulator_config config = { };
struct regulator_dev *rdev;
struct device *dev;
struct mcp16502 *mcp;
struct regmap *rmap;
int i, ret;
dev = &client->dev;
config.dev = dev;
mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
if (!mcp)
return -ENOMEM;
rmap = devm_regmap_init_i2c(client, &mcp16502_regmap_config);
if (IS_ERR(rmap)) {
ret = PTR_ERR(rmap);
dev_err(dev, "regmap init failed: %d\n", ret);
return ret;
}
i2c_set_clientdata(client, mcp);
config.regmap = rmap;
config.driver_data = mcp;
mcp->lpm = devm_gpiod_get_optional(dev, "lpm", GPIOD_OUT_LOW);
if (IS_ERR(mcp->lpm)) {
dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm));
return PTR_ERR(mcp->lpm);
}
for (i = 0; i < NUM_REGULATORS; i++) {
rdev = devm_regulator_register(dev, &mcp16502_desc[i], &config);
if (IS_ERR(rdev)) {
dev_err(dev,
"failed to register %s regulator %ld\n",
mcp16502_desc[i].name, PTR_ERR(rdev));
return PTR_ERR(rdev);
}
}
mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int mcp16502_suspend_noirq(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mcp16502 *mcp = i2c_get_clientdata(client);
mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_LPM);
return 0;
}
static int mcp16502_resume_noirq(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mcp16502 *mcp = i2c_get_clientdata(client);
mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE);
return 0;
}
#endif
#ifdef CONFIG_PM
static const struct dev_pm_ops mcp16502_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mcp16502_suspend_noirq,
mcp16502_resume_noirq)
};
#endif
static const struct i2c_device_id mcp16502_i2c_id[] = {
{ "mcp16502", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mcp16502_i2c_id);
static struct i2c_driver mcp16502_drv = {
.probe_new = mcp16502_probe,
.driver = {
.name = "mcp16502-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(mcp16502_ids),
#ifdef CONFIG_PM
.pm = &mcp16502_pm_ops,
#endif
},
.id_table = mcp16502_i2c_id,
};
module_i2c_driver(mcp16502_drv);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MCP16502 PMIC driver");
MODULE_AUTHOR("Andrei Stefanescu andrei.stefanescu@microchip.com");
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