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linux-next/drivers/regulator/mcp16502.c
Claudiu Beznea 3c42728c18
regulator: mcp16502: lpm pin can be optional on some platforms 
On some platform (e.g. SAMA7G5) LPM pin should be optional as it can
be controlled explicitly (via shutdown controller registers) in the
platform specific power saving code to decrease the power consumption
while suspended as this SoC pin may be connected to other devices that
could take power saving actions based on its value.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1610028927-9842-3-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-01-07 16:14:58 +00:00

625 lines
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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_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 int mcp16502_ramp_b1l12[] = { 6250, 3125, 2083, 1563 };
/* Ramp delay (uV/us) for buck2, buck3, buck4. */
static const 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) \
[_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, \
}
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;
}
static int mcp16502_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
const int *ramp;
int id = rdev_get_id(rdev);
unsigned int i, size;
switch (id) {
case BUCK1:
case LDO1:
case LDO2:
ramp = mcp16502_ramp_b1l12;
size = ARRAY_SIZE(mcp16502_ramp_b1l12);
break;
case BUCK2:
case BUCK3:
case BUCK4:
ramp = mcp16502_ramp_b234;
size = ARRAY_SIZE(mcp16502_ramp_b234);
break;
default:
return -EINVAL;
}
for (i = 0; i < size; i++) {
if (ramp[i] == ramp_delay)
break;
}
if (i == size)
return -EINVAL;
return regmap_update_bits(rdev->regmap, MCP16502_REG_BASE(id, CFG),
MCP16502_DVSR, (i << 2));
}
#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 = mcp16502_set_ramp_delay,
.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 = mcp16502_set_ramp_delay,
#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) */
MCP16502_REGULATOR("VDD_IO", BUCK1, b1l12_ranges, mcp16502_buck_ops),
MCP16502_REGULATOR("VDD_DDR", BUCK2, b234_ranges, mcp16502_buck_ops),
MCP16502_REGULATOR("VDD_CORE", BUCK3, b234_ranges, mcp16502_buck_ops),
MCP16502_REGULATOR("VDD_OTHER", BUCK4, b234_ranges, mcp16502_buck_ops),
MCP16502_REGULATOR("LDO1", LDO1, b1l12_ranges, mcp16502_ldo_ops),
MCP16502_REGULATOR("LDO2", LDO2, b1l12_ranges, mcp16502_ldo_ops)
};
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,
const struct i2c_device_id *id)
{
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 = mcp16502_probe,
.driver = {
.name = "mcp16502-regulator",
.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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