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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_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_BASE(i) (((i) + 1) << 4)
#define MCP16502_STAT_BASE(i) ((i) + 5)
#define MCP16502_OFFSET_MODE_A 0
#define MCP16502_OFFSET_MODE_LPM 1
#define MCP16502_OFFSET_MODE_HIB 2
#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
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, \
.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
* @rdev: the regulators belonging to this chip
* @rmap: regmap to be used for I2C communication
* @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 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_reg(struct regulator_dev *rdev, int opmode)
{
int reg = MCP16502_BASE(rdev_get_id(rdev));
switch (opmode) {
case MCP16502_OPMODE_ACTIVE:
return reg + MCP16502_OFFSET_MODE_A;
case MCP16502_OPMODE_LPM:
return reg + MCP16502_OFFSET_MODE_LPM;
case MCP16502_OPMODE_HIB:
return reg + MCP16502_OFFSET_MODE_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_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_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;
}
#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_reg(rdev, MCP16502_OPMODE_LPM);
case PM_SUSPEND_ON:
case PM_SUSPEND_MEM:
return mcp16502_get_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
|