// SPDX-License-Identifier: GPL-2.0
//
// Device driver for regulators in Hisi IC
//
// Copyright (c) 2013 Linaro Ltd.
// Copyright (c) 2011 HiSilicon Ltd.
// Copyright (c) 2020-2021 Huawei Technologies Co., Ltd.
//
// Guodong Xu <[email protected]>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/spmi.h>
struct hi6421_spmi_reg_priv {
/* Serialize regulator enable logic */
struct mutex enable_mutex;
};
struct hi6421_spmi_reg_info {
struct regulator_desc desc;
u8 eco_mode_mask;
u32 eco_uA;
};
static const unsigned int range_1v5_to_2v0[] = {
1500000, 1550000, 1600000, 1650000,
1700000, 1725000, 1750000, 1775000,
1800000, 1825000, 1850000, 1875000,
1900000, 1925000, 1950000, 2000000
};
static const unsigned int range_1v725_to_1v9[] = {
1725000, 1750000, 1775000, 1800000,
1825000, 1850000, 1875000, 1900000
};
static const unsigned int range_1v75_to_3v3[] = {
1750000, 1800000, 1825000, 2800000,
2850000, 2950000, 3000000, 3300000
};
static const unsigned int range_1v8_to_3v0[] = {
1800000, 1850000, 2400000, 2600000,
2700000, 2850000, 2950000, 3000000
};
static const unsigned int range_2v5_to_3v3[] = {
2500000, 2600000, 2700000, 2800000,
3000000, 3100000, 3200000, 3300000
};
static const unsigned int range_2v6_to_3v3[] = {
2600000, 2700000, 2800000, 2900000,
3000000, 3100000, 3200000, 3300000
};
/**
* HI6421V600_LDO() - specify a LDO power line
* @_id: LDO id name string
* @vtable: voltage table
* @ereg: enable register
* @emask: enable mask
* @vreg: voltage select register
* @odelay: off/on delay time in uS
* @etime: enable time in uS
* @ecomask: eco mode mask
* @ecoamp: eco mode load uppler limit in uA
*/
#define HI6421V600_LDO(_id, vtable, ereg, emask, vreg, \
odelay, etime, ecomask, ecoamp) \
[hi6421v600_##_id] = { \
.desc = { \
.name = #_id, \
.of_match = of_match_ptr(#_id), \
.regulators_node = of_match_ptr("regulators"), \
.ops = &hi6421_spmi_ldo_rops, \
.type = REGULATOR_VOLTAGE, \
.id = hi6421v600_##_id, \
.owner = THIS_MODULE, \
.volt_table = vtable, \
.n_voltages = ARRAY_SIZE(vtable), \
.vsel_mask = ARRAY_SIZE(vtable) - 1, \
.vsel_reg = vreg, \
.enable_reg = ereg, \
.enable_mask = emask, \
.enable_time = etime, \
.ramp_delay = etime, \
.off_on_delay = odelay, \
}, \
.eco_mode_mask = ecomask, \
.eco_uA = ecoamp, \
}
static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
{
struct hi6421_spmi_reg_priv *priv = rdev_get_drvdata(rdev);
int ret;
/* cannot enable more than one regulator at one time */
mutex_lock(&priv->enable_mutex);
ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
rdev->desc->enable_mask,
rdev->desc->enable_mask);
/* Avoid powering up multiple devices at the same time */
usleep_range(rdev->desc->off_on_delay, rdev->desc->off_on_delay + 60);
mutex_unlock(&priv->enable_mutex);
return ret;
}
static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
{
const struct hi6421_spmi_reg_info *sreg;
unsigned int reg_val;
sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
regmap_read(rdev->regmap, rdev->desc->enable_reg, ®_val);
if (reg_val & sreg->eco_mode_mask)
return REGULATOR_MODE_IDLE;
return REGULATOR_MODE_NORMAL;
}
static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
const struct hi6421_spmi_reg_info *sreg;
unsigned int val;
sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
switch (mode) {
case REGULATOR_MODE_NORMAL:
val = 0;
break;
case REGULATOR_MODE_IDLE:
if (!sreg->eco_mode_mask)
return -EINVAL;
val = sreg->eco_mode_mask;
break;
default:
return -EINVAL;
}
return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
sreg->eco_mode_mask, val);
}
static unsigned int
hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
int input_uV, int output_uV,
int load_uA)
{
const struct hi6421_spmi_reg_info *sreg;
sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
if (!sreg->eco_uA || ((unsigned int)load_uA > sreg->eco_uA))
return REGULATOR_MODE_NORMAL;
return REGULATOR_MODE_IDLE;
}
static const struct regulator_ops hi6421_spmi_ldo_rops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = hi6421_spmi_regulator_enable,
.disable = regulator_disable_regmap,
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_mode = hi6421_spmi_regulator_get_mode,
.set_mode = hi6421_spmi_regulator_set_mode,
.get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,
};
/* HI6421v600 regulators with known registers */
enum hi6421_spmi_regulator_id {
hi6421v600_ldo3,
hi6421v600_ldo4,
hi6421v600_ldo9,
hi6421v600_ldo15,
hi6421v600_ldo16,
hi6421v600_ldo17,
hi6421v600_ldo33,
hi6421v600_ldo34,
};
static const struct hi6421_spmi_reg_info regulator_info[] = {
HI6421V600_LDO(ldo3, range_1v5_to_2v0,
0x16, 0x01, 0x51,
20000, 120,
0, 0),
HI6421V600_LDO(ldo4, range_1v725_to_1v9,
0x17, 0x01, 0x52,
20000, 120,
0x10, 10000),
HI6421V600_LDO(ldo9, range_1v75_to_3v3,
0x1c, 0x01, 0x57,
20000, 360,
0x10, 10000),
HI6421V600_LDO(ldo15, range_1v8_to_3v0,
0x21, 0x01, 0x5c,
20000, 360,
0x10, 10000),
HI6421V600_LDO(ldo16, range_1v8_to_3v0,
0x22, 0x01, 0x5d,
20000, 360,
0x10, 10000),
HI6421V600_LDO(ldo17, range_2v5_to_3v3,
0x23, 0x01, 0x5e,
20000, 120,
0x10, 10000),
HI6421V600_LDO(ldo33, range_2v5_to_3v3,
0x32, 0x01, 0x6d,
20000, 120,
0, 0),
HI6421V600_LDO(ldo34, range_2v6_to_3v3,
0x33, 0x01, 0x6e,
20000, 120,
0, 0),
};
static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
{
struct device *pmic_dev = pdev->dev.parent;
struct regulator_config config = { };
struct hi6421_spmi_reg_priv *priv;
const struct hi6421_spmi_reg_info *info;
struct device *dev = &pdev->dev;
struct regmap *regmap;
struct regulator_dev *rdev;
int i;
/*
* This driver is meant to be called by hi6421-spmi-core,
* which should first set drvdata. If this doesn't happen, hit
* a warn on and return.
*/
regmap = dev_get_drvdata(pmic_dev);
if (WARN_ON(!regmap))
return -ENODEV;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
mutex_init(&priv->enable_mutex);
for (i = 0; i < ARRAY_SIZE(regulator_info); i++) {
info = ®ulator_info[i];
config.dev = pdev->dev.parent;
config.driver_data = priv;
config.regmap = regmap;
rdev = devm_regulator_register(dev, &info->desc, &config);
if (IS_ERR(rdev)) {
dev_err(dev, "failed to register %s\n",
info->desc.name);
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct platform_device_id hi6421_spmi_regulator_table[] = {
{ .name = "hi6421v600-regulator" },
{},
};
MODULE_DEVICE_TABLE(platform, hi6421_spmi_regulator_table);
static struct platform_driver hi6421_spmi_regulator_driver = {
.id_table = hi6421_spmi_regulator_table,
.driver = {
.name = "hi6421v600-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = hi6421_spmi_regulator_probe,
};
module_platform_driver(hi6421_spmi_regulator_driver);
MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");
MODULE_LICENSE("GPL v2");
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