273 lines
6.7 KiB
C
273 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Regulators driver for Maxim max8649
|
|
*
|
|
* Copyright (C) 2009-2010 Marvell International Ltd.
|
|
* Haojian Zhuang <haojian.zhuang@marvell.com>
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/err.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/regulator/max8649.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#define MAX8649_DCDC_VMIN 750000 /* uV */
|
|
#define MAX8649_DCDC_VMAX 1380000 /* uV */
|
|
#define MAX8649_DCDC_STEP 10000 /* uV */
|
|
#define MAX8649_VOL_MASK 0x3f
|
|
|
|
/* Registers */
|
|
#define MAX8649_MODE0 0x00
|
|
#define MAX8649_MODE1 0x01
|
|
#define MAX8649_MODE2 0x02
|
|
#define MAX8649_MODE3 0x03
|
|
#define MAX8649_CONTROL 0x04
|
|
#define MAX8649_SYNC 0x05
|
|
#define MAX8649_RAMP 0x06
|
|
#define MAX8649_CHIP_ID1 0x08
|
|
#define MAX8649_CHIP_ID2 0x09
|
|
|
|
/* Bits */
|
|
#define MAX8649_EN_PD (1 << 7)
|
|
#define MAX8649_VID0_PD (1 << 6)
|
|
#define MAX8649_VID1_PD (1 << 5)
|
|
#define MAX8649_VID_MASK (3 << 5)
|
|
|
|
#define MAX8649_FORCE_PWM (1 << 7)
|
|
#define MAX8649_SYNC_EXTCLK (1 << 6)
|
|
|
|
#define MAX8649_EXT_MASK (3 << 6)
|
|
|
|
#define MAX8649_RAMP_MASK (7 << 5)
|
|
#define MAX8649_RAMP_DOWN (1 << 1)
|
|
|
|
struct max8649_regulator_info {
|
|
struct device *dev;
|
|
struct regmap *regmap;
|
|
|
|
unsigned mode:2; /* bit[1:0] = VID1, VID0 */
|
|
unsigned extclk_freq:2;
|
|
unsigned extclk:1;
|
|
unsigned ramp_timing:3;
|
|
unsigned ramp_down:1;
|
|
};
|
|
|
|
static int max8649_enable_time(struct regulator_dev *rdev)
|
|
{
|
|
struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
|
|
int voltage, rate, ret;
|
|
unsigned int val;
|
|
|
|
/* get voltage */
|
|
ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
|
|
if (ret != 0)
|
|
return ret;
|
|
val &= MAX8649_VOL_MASK;
|
|
voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);
|
|
|
|
/* get rate */
|
|
ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
|
|
if (ret != 0)
|
|
return ret;
|
|
ret = (val & MAX8649_RAMP_MASK) >> 5;
|
|
rate = (32 * 1000) >> ret; /* uV/uS */
|
|
|
|
return DIV_ROUND_UP(voltage, rate);
|
|
}
|
|
|
|
static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
|
|
{
|
|
struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
|
|
|
|
switch (mode) {
|
|
case REGULATOR_MODE_FAST:
|
|
regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
|
|
MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
|
|
break;
|
|
case REGULATOR_MODE_NORMAL:
|
|
regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
|
|
MAX8649_FORCE_PWM, 0);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int max8649_get_mode(struct regulator_dev *rdev)
|
|
{
|
|
struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
|
|
if (ret != 0)
|
|
return ret;
|
|
if (val & MAX8649_FORCE_PWM)
|
|
return REGULATOR_MODE_FAST;
|
|
return REGULATOR_MODE_NORMAL;
|
|
}
|
|
|
|
static const struct regulator_ops max8649_dcdc_ops = {
|
|
.set_voltage_sel = regulator_set_voltage_sel_regmap,
|
|
.get_voltage_sel = regulator_get_voltage_sel_regmap,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
.map_voltage = regulator_map_voltage_linear,
|
|
.enable = regulator_enable_regmap,
|
|
.disable = regulator_disable_regmap,
|
|
.is_enabled = regulator_is_enabled_regmap,
|
|
.enable_time = max8649_enable_time,
|
|
.set_mode = max8649_set_mode,
|
|
.get_mode = max8649_get_mode,
|
|
|
|
};
|
|
|
|
static struct regulator_desc dcdc_desc = {
|
|
.name = "max8649",
|
|
.ops = &max8649_dcdc_ops,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.n_voltages = 1 << 6,
|
|
.owner = THIS_MODULE,
|
|
.vsel_mask = MAX8649_VOL_MASK,
|
|
.min_uV = MAX8649_DCDC_VMIN,
|
|
.uV_step = MAX8649_DCDC_STEP,
|
|
.enable_reg = MAX8649_CONTROL,
|
|
.enable_mask = MAX8649_EN_PD,
|
|
.enable_is_inverted = true,
|
|
};
|
|
|
|
static const struct regmap_config max8649_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
};
|
|
|
|
static int max8649_regulator_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct max8649_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
struct max8649_regulator_info *info = NULL;
|
|
struct regulator_dev *regulator;
|
|
struct regulator_config config = { };
|
|
unsigned int val;
|
|
unsigned char data;
|
|
int ret;
|
|
|
|
info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
|
|
GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
|
|
if (IS_ERR(info->regmap)) {
|
|
ret = PTR_ERR(info->regmap);
|
|
dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
info->dev = &client->dev;
|
|
i2c_set_clientdata(client, info);
|
|
|
|
info->mode = pdata->mode;
|
|
switch (info->mode) {
|
|
case 0:
|
|
dcdc_desc.vsel_reg = MAX8649_MODE0;
|
|
break;
|
|
case 1:
|
|
dcdc_desc.vsel_reg = MAX8649_MODE1;
|
|
break;
|
|
case 2:
|
|
dcdc_desc.vsel_reg = MAX8649_MODE2;
|
|
break;
|
|
case 3:
|
|
dcdc_desc.vsel_reg = MAX8649_MODE3;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
|
|
if (ret != 0) {
|
|
dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);
|
|
|
|
/* enable VID0 & VID1 */
|
|
regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
|
|
|
|
/* enable/disable external clock synchronization */
|
|
info->extclk = pdata->extclk;
|
|
data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
|
|
regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
|
|
MAX8649_SYNC_EXTCLK, data);
|
|
if (info->extclk) {
|
|
/* set external clock frequency */
|
|
info->extclk_freq = pdata->extclk_freq;
|
|
regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
|
|
info->extclk_freq << 6);
|
|
}
|
|
|
|
if (pdata->ramp_timing) {
|
|
info->ramp_timing = pdata->ramp_timing;
|
|
regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
|
|
info->ramp_timing << 5);
|
|
}
|
|
|
|
info->ramp_down = pdata->ramp_down;
|
|
if (info->ramp_down) {
|
|
regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
|
|
MAX8649_RAMP_DOWN);
|
|
}
|
|
|
|
config.dev = &client->dev;
|
|
config.init_data = pdata->regulator;
|
|
config.driver_data = info;
|
|
config.regmap = info->regmap;
|
|
|
|
regulator = devm_regulator_register(&client->dev, &dcdc_desc,
|
|
&config);
|
|
if (IS_ERR(regulator)) {
|
|
dev_err(info->dev, "failed to register regulator %s\n",
|
|
dcdc_desc.name);
|
|
return PTR_ERR(regulator);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max8649_id[] = {
|
|
{ "max8649", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max8649_id);
|
|
|
|
static struct i2c_driver max8649_driver = {
|
|
.probe = max8649_regulator_probe,
|
|
.driver = {
|
|
.name = "max8649",
|
|
},
|
|
.id_table = max8649_id,
|
|
};
|
|
|
|
static int __init max8649_init(void)
|
|
{
|
|
return i2c_add_driver(&max8649_driver);
|
|
}
|
|
subsys_initcall(max8649_init);
|
|
|
|
static void __exit max8649_exit(void)
|
|
{
|
|
i2c_del_driver(&max8649_driver);
|
|
}
|
|
module_exit(max8649_exit);
|
|
|
|
/* Module information */
|
|
MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
|
|
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
|
|
MODULE_LICENSE("GPL");
|