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max77802-regulator.c
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// SPDX-License-Identifier: GPL-2.0+
//
// max77802.c - Regulator driver for the Maxim 77802
//
// Copyright (C) 2013-2014 Google, Inc
// Simon Glass <[email protected]>
//
// Copyright (C) 2012 Samsung Electronics
// Chiwoong Byun <[email protected]>
// Jonghwa Lee <[email protected]>
//
// This driver is based on max8997.c
#include <linux/kernel.h>
#include <linux/bug.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/max77686.h>
#include <linux/mfd/max77686-private.h>
#include <dt-bindings/regulator/maxim,max77802.h>
/* Default ramp delay in case it is not manually set */
#define MAX77802_RAMP_DELAY 100000 /* uV/us */
#define MAX77802_OPMODE_SHIFT_LDO 6
#define MAX77802_OPMODE_BUCK234_SHIFT 4
#define MAX77802_OPMODE_MASK 0x3
#define MAX77802_VSEL_MASK 0x3F
#define MAX77802_DVS_VSEL_MASK 0xFF
#define MAX77802_RAMP_RATE_MASK_2BIT 0xC0
#define MAX77802_RAMP_RATE_SHIFT_2BIT 6
#define MAX77802_RAMP_RATE_MASK_4BIT 0xF0
#define MAX77802_RAMP_RATE_SHIFT_4BIT 4
#define MAX77802_STATUS_OFF 0x0
#define MAX77802_OFF_PWRREQ 0x1
#define MAX77802_LP_PWRREQ 0x2
static const unsigned int max77802_buck234_ramp_table[] = {
12500,
25000,
50000,
100000,
};
static const unsigned int max77802_buck16_ramp_table[] = {
1000, 2000, 3030, 4000,
5000, 5880, 7140, 8330,
9090, 10000, 11110, 12500,
16670, 25000, 50000, 100000,
};
struct max77802_regulator_prv {
/* Array indexed by regulator id */
unsigned int opmode[MAX77802_REG_MAX];
};
static inline unsigned int max77802_map_mode(unsigned int mode)
{
return mode == MAX77802_OPMODE_NORMAL ?
REGULATOR_MODE_NORMAL : REGULATOR_MODE_STANDBY;
}
static int max77802_get_opmode_shift(int id)
{
if (id == MAX77802_BUCK1 || (id >= MAX77802_BUCK5 &&
id <= MAX77802_BUCK10))
return 0;
if (id >= MAX77802_BUCK2 && id <= MAX77802_BUCK4)
return MAX77802_OPMODE_BUCK234_SHIFT;
if (id >= MAX77802_LDO1 && id <= MAX77802_LDO35)
return MAX77802_OPMODE_SHIFT_LDO;
return -EINVAL;
}
/**
* max77802_set_suspend_disable - Disable the regulator during system suspend
* @rdev: regulator to mark as disabled
*
* All regulators expect LDO 1, 3, 20 and 21 support OFF by PWRREQ.
* Configure the regulator so the PMIC will turn it OFF during system suspend.
*/
static int max77802_set_suspend_disable(struct regulator_dev *rdev)
{
unsigned int val = MAX77802_OFF_PWRREQ;
struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
int shift = max77802_get_opmode_shift(id);
max77802->opmode[id] = val;
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask, val << shift);
}
/*
* Some LDOs support Low Power Mode while the system is running.
*
* LDOs 1, 3, 20, 21.
*/
static int max77802_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
unsigned int val;
int shift = max77802_get_opmode_shift(id);
switch (mode) {
case REGULATOR_MODE_STANDBY:
val = MAX77802_OPMODE_LP; /* ON in Low Power Mode */
break;
case REGULATOR_MODE_NORMAL:
val = MAX77802_OPMODE_NORMAL; /* ON in Normal Mode */
break;
default:
dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
rdev->desc->name, mode);
return -EINVAL;
}
max77802->opmode[id] = val;
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask, val << shift);
}
static unsigned max77802_get_mode(struct regulator_dev *rdev)
{
struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
return max77802_map_mode(max77802->opmode[id]);
}
/**
* max77802_set_suspend_mode - set regulator opmode when the system is suspended
* @rdev: regulator to change mode
* @mode: operating mode to be set
*
* Will set the operating mode for the regulators during system suspend.
* This function is valid for the three different enable control logics:
*
* Enable Control Logic1 by PWRREQ (BUCK 2-4 and LDOs 2, 4-19, 22-35)
* Enable Control Logic2 by PWRREQ (LDOs 1, 20, 21)
* Enable Control Logic3 by PWRREQ (LDO 3)
*
* If setting the regulator mode fails, the function only warns but does
* not return an error code to avoid the regulator core to stop setting
* the operating mode for the remaining regulators.
*/
static int max77802_set_suspend_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
unsigned int val;
int shift = max77802_get_opmode_shift(id);
/*
* If the regulator has been disabled for suspend
* then is invalid to try setting a suspend mode.
*/
if (max77802->opmode[id] == MAX77802_OFF_PWRREQ) {
dev_warn(&rdev->dev, "%s: is disabled, mode: 0x%x not set\n",
rdev->desc->name, mode);
return 0;
}
switch (mode) {
case REGULATOR_MODE_STANDBY:
/*
* If the regulator opmode is normal then enable
* ON in Low Power Mode by PWRREQ. If the mode is
* already Low Power then no action is required.
*/
if (max77802->opmode[id] == MAX77802_OPMODE_NORMAL)
val = MAX77802_LP_PWRREQ;
else
return 0;
break;
case REGULATOR_MODE_NORMAL:
/*
* If the regulator operating mode is Low Power then
* normal is not a valid opmode in suspend. If the
* mode is already normal then no action is required.
*/
if (max77802->opmode[id] == MAX77802_OPMODE_LP)
dev_warn(&rdev->dev, "%s: in Low Power: 0x%x invalid\n",
rdev->desc->name, mode);
return 0;
default:
dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
rdev->desc->name, mode);
return -EINVAL;
}
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask, val << shift);
}
static int max77802_enable(struct regulator_dev *rdev)
{
struct max77802_regulator_prv *max77802 = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
int shift = max77802_get_opmode_shift(id);
if (max77802->opmode[id] == MAX77802_OFF_PWRREQ)
max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
max77802->opmode[id] << shift);
}
/*
* LDOs 2, 4-19, 22-35
*/
static const struct regulator_ops max77802_ldo_ops_logic1 = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = max77802_enable,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_suspend_disable = max77802_set_suspend_disable,
.set_suspend_mode = max77802_set_suspend_mode,
};
/*
* LDOs 1, 20, 21, 3
*/
static const struct regulator_ops max77802_ldo_ops_logic2 = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = max77802_enable,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_mode = max77802_set_mode,
.get_mode = max77802_get_mode,
.set_suspend_mode = max77802_set_suspend_mode,
};
/* BUCKS 1, 6 */
static const struct regulator_ops max77802_buck_16_dvs_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = max77802_enable,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.set_suspend_disable = max77802_set_suspend_disable,
};
/* BUCKs 2-4 */
static const struct regulator_ops max77802_buck_234_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = max77802_enable,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.set_suspend_disable = max77802_set_suspend_disable,
.set_suspend_mode = max77802_set_suspend_mode,
};
/* BUCKs 5, 7-10 */
static const struct regulator_ops max77802_buck_dvs_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = max77802_enable,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_suspend_disable = max77802_set_suspend_disable,
};
/* LDOs 3-7, 9-14, 18-26, 28, 29, 32-34 */
#define regulator_77802_desc_p_ldo(num, supply, log) { \
.name = "LDO"#num, \
.of_match = of_match_ptr("LDO"#num), \
.regulators_node = of_match_ptr("regulators"), \
.id = MAX77802_LDO##num, \
.supply_name = "inl"#supply, \
.ops = &max77802_ldo_ops_logic##log, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = 800000, \
.uV_step = 50000, \
.ramp_delay = MAX77802_RAMP_DELAY, \
.n_voltages = 1 << 6, \
.vsel_reg = MAX77802_REG_LDO1CTRL1 + num - 1, \
.vsel_mask = MAX77802_VSEL_MASK, \
.enable_reg = MAX77802_REG_LDO1CTRL1 + num - 1, \
.enable_mask = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
.of_map_mode = max77802_map_mode, \
}
/* LDOs 1, 2, 8, 15, 17, 27, 30, 35 */
#define regulator_77802_desc_n_ldo(num, supply, log) { \
.name = "LDO"#num, \
.of_match = of_match_ptr("LDO"#num), \
.regulators_node = of_match_ptr("regulators"), \
.id = MAX77802_LDO##num, \
.supply_name = "inl"#supply, \
.ops = &max77802_ldo_ops_logic##log, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = 800000, \
.uV_step = 25000, \
.ramp_delay = MAX77802_RAMP_DELAY, \
.n_voltages = 1 << 6, \
.vsel_reg = MAX77802_REG_LDO1CTRL1 + num - 1, \
.vsel_mask = MAX77802_VSEL_MASK, \
.enable_reg = MAX77802_REG_LDO1CTRL1 + num - 1, \
.enable_mask = MAX77802_OPMODE_MASK << MAX77802_OPMODE_SHIFT_LDO, \
.of_map_mode = max77802_map_mode, \
}
/* BUCKs 1, 6 */
#define regulator_77802_desc_16_buck(num) { \
.name = "BUCK"#num, \
.of_match = of_match_ptr("BUCK"#num), \
.regulators_node = of_match_ptr("regulators"), \
.id = MAX77802_BUCK##num, \
.supply_name = "inb"#num, \
.ops = &max77802_buck_16_dvs_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = 612500, \
.uV_step = 6250, \
.ramp_delay = MAX77802_RAMP_DELAY, \
.n_voltages = 1 << 8, \
.vsel_reg = MAX77802_REG_BUCK ## num ## DVS1, \
.vsel_mask = MAX77802_DVS_VSEL_MASK, \
.enable_reg = MAX77802_REG_BUCK ## num ## CTRL, \
.enable_mask = MAX77802_OPMODE_MASK, \
.ramp_reg = MAX77802_REG_BUCK ## num ## CTRL, \
.ramp_mask = MAX77802_RAMP_RATE_MASK_4BIT, \
.ramp_delay_table = max77802_buck16_ramp_table, \
.n_ramp_values = ARRAY_SIZE(max77802_buck16_ramp_table), \
.of_map_mode = max77802_map_mode, \
}
/* BUCKS 2-4 */
#define regulator_77802_desc_234_buck(num) { \
.name = "BUCK"#num, \
.of_match = of_match_ptr("BUCK"#num), \
.regulators_node = of_match_ptr("regulators"), \
.id = MAX77802_BUCK##num, \
.supply_name = "inb"#num, \
.ops = &max77802_buck_234_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = 600000, \
.uV_step = 6250, \
.ramp_delay = MAX77802_RAMP_DELAY, \
.n_voltages = 0x91, \
.vsel_reg = MAX77802_REG_BUCK ## num ## DVS1, \
.vsel_mask = MAX77802_DVS_VSEL_MASK, \
.enable_reg = MAX77802_REG_BUCK ## num ## CTRL1, \
.enable_mask = MAX77802_OPMODE_MASK << \
MAX77802_OPMODE_BUCK234_SHIFT, \
.ramp_reg = MAX77802_REG_BUCK ## num ## CTRL1, \
.ramp_mask = MAX77802_RAMP_RATE_MASK_2BIT, \
.ramp_delay_table = max77802_buck234_ramp_table, \
.n_ramp_values = ARRAY_SIZE(max77802_buck234_ramp_table), \
.of_map_mode = max77802_map_mode, \
}
/* BUCK 5 */
#define regulator_77802_desc_buck5(num) { \
.name = "BUCK"#num, \
.of_match = of_match_ptr("BUCK"#num), \
.regulators_node = of_match_ptr("regulators"), \
.id = MAX77802_BUCK##num, \
.supply_name = "inb"#num, \
.ops = &max77802_buck_dvs_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = 750000, \
.uV_step = 50000, \
.ramp_delay = MAX77802_RAMP_DELAY, \
.n_voltages = 1 << 6, \
.vsel_reg = MAX77802_REG_BUCK5OUT, \
.vsel_mask = MAX77802_VSEL_MASK, \
.enable_reg = MAX77802_REG_BUCK5CTRL, \
.enable_mask = MAX77802_OPMODE_MASK, \
.of_map_mode = max77802_map_mode, \
}
/* BUCKs 7-10 */
#define regulator_77802_desc_buck7_10(num) { \
.name = "BUCK"#num, \
.of_match = of_match_ptr("BUCK"#num), \
.regulators_node = of_match_ptr("regulators"), \
.id = MAX77802_BUCK##num, \
.supply_name = "inb"#num, \
.ops = &max77802_buck_dvs_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = 750000, \
.uV_step = 50000, \
.ramp_delay = MAX77802_RAMP_DELAY, \
.n_voltages = 1 << 6, \
.vsel_reg = MAX77802_REG_BUCK7OUT + (num - 7) * 3, \
.vsel_mask = MAX77802_VSEL_MASK, \
.enable_reg = MAX77802_REG_BUCK7CTRL + (num - 7) * 3, \
.enable_mask = MAX77802_OPMODE_MASK, \
.of_map_mode = max77802_map_mode, \
}
static const struct regulator_desc regulators[] = {
regulator_77802_desc_16_buck(1),
regulator_77802_desc_234_buck(2),
regulator_77802_desc_234_buck(3),
regulator_77802_desc_234_buck(4),
regulator_77802_desc_buck5(5),
regulator_77802_desc_16_buck(6),
regulator_77802_desc_buck7_10(7),
regulator_77802_desc_buck7_10(8),
regulator_77802_desc_buck7_10(9),
regulator_77802_desc_buck7_10(10),
regulator_77802_desc_n_ldo(1, 10, 2),
regulator_77802_desc_n_ldo(2, 10, 1),
regulator_77802_desc_p_ldo(3, 3, 2),
regulator_77802_desc_p_ldo(4, 6, 1),
regulator_77802_desc_p_ldo(5, 3, 1),
regulator_77802_desc_p_ldo(6, 3, 1),
regulator_77802_desc_p_ldo(7, 3, 1),
regulator_77802_desc_n_ldo(8, 1, 1),
regulator_77802_desc_p_ldo(9, 5, 1),
regulator_77802_desc_p_ldo(10, 4, 1),
regulator_77802_desc_p_ldo(11, 4, 1),
regulator_77802_desc_p_ldo(12, 9, 1),
regulator_77802_desc_p_ldo(13, 4, 1),
regulator_77802_desc_p_ldo(14, 4, 1),
regulator_77802_desc_n_ldo(15, 1, 1),
regulator_77802_desc_n_ldo(17, 2, 1),
regulator_77802_desc_p_ldo(18, 7, 1),
regulator_77802_desc_p_ldo(19, 5, 1),
regulator_77802_desc_p_ldo(20, 7, 2),
regulator_77802_desc_p_ldo(21, 6, 2),
regulator_77802_desc_p_ldo(23, 9, 1),
regulator_77802_desc_p_ldo(24, 6, 1),
regulator_77802_desc_p_ldo(25, 9, 1),
regulator_77802_desc_p_ldo(26, 9, 1),
regulator_77802_desc_n_ldo(27, 2, 1),
regulator_77802_desc_p_ldo(28, 7, 1),
regulator_77802_desc_p_ldo(29, 7, 1),
regulator_77802_desc_n_ldo(30, 2, 1),
regulator_77802_desc_p_ldo(32, 9, 1),
regulator_77802_desc_p_ldo(33, 6, 1),
regulator_77802_desc_p_ldo(34, 9, 1),
regulator_77802_desc_n_ldo(35, 2, 1),
};
static int max77802_pmic_probe(struct platform_device *pdev)
{
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max77802_regulator_prv *max77802;
int i, val;
struct regulator_config config = { };
max77802 = devm_kzalloc(&pdev->dev,
sizeof(struct max77802_regulator_prv),
GFP_KERNEL);
if (!max77802)
return -ENOMEM;
config.dev = iodev->dev;
config.regmap = iodev->regmap;
config.driver_data = max77802;
platform_set_drvdata(pdev, max77802);
for (i = 0; i < MAX77802_REG_MAX; i++) {
struct regulator_dev *rdev;
int id = regulators[i].id;
int shift = max77802_get_opmode_shift(id);
int ret;
ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
if (ret < 0) {
dev_warn(&pdev->dev,
"cannot read current mode for %d\n", i);
val = MAX77802_OPMODE_NORMAL;
} else {
val = val >> shift & MAX77802_OPMODE_MASK;
}
/*
* If the regulator is disabled and the system warm rebooted,
* the hardware reports OFF as the regulator operating mode.
* Default to operating mode NORMAL in that case.
*/
if (val == MAX77802_STATUS_OFF)
max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
else
max77802->opmode[id] = val;
rdev = devm_regulator_register(&pdev->dev,
®ulators[i], &config);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
dev_err(&pdev->dev,
"regulator init failed for %d: %d\n", i, ret);
return ret;
}
}
return 0;
}
static const struct platform_device_id max77802_pmic_id[] = {
{"max77802-pmic", 0},
{ },
};
MODULE_DEVICE_TABLE(platform, max77802_pmic_id);
static struct platform_driver max77802_pmic_driver = {
.driver = {
.name = "max77802-pmic",
},
.probe = max77802_pmic_probe,
.id_table = max77802_pmic_id,
};
module_platform_driver(max77802_pmic_driver);
MODULE_DESCRIPTION("MAXIM 77802 Regulator Driver");
MODULE_AUTHOR("Simon Glass <[email protected]>");
MODULE_LICENSE("GPL");