mirror of https://gitee.com/openkylin/linux.git
256 lines
6.7 KiB
C
256 lines
6.7 KiB
C
/*
|
|
* pbias-regulator.c
|
|
*
|
|
* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
|
|
* Author: Balaji T K <balajitk@ti.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation version 2.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether express or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include <linux/regulator/machine.h>
|
|
#include <linux/regulator/of_regulator.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
|
|
struct pbias_reg_info {
|
|
u32 enable;
|
|
u32 enable_mask;
|
|
u32 vmode;
|
|
unsigned int enable_time;
|
|
char *name;
|
|
};
|
|
|
|
struct pbias_regulator_data {
|
|
struct regulator_desc desc;
|
|
void __iomem *pbias_addr;
|
|
unsigned int pbias_reg;
|
|
struct regulator_dev *dev;
|
|
struct regmap *syscon;
|
|
const struct pbias_reg_info *info;
|
|
int voltage;
|
|
};
|
|
|
|
static int pbias_regulator_set_voltage(struct regulator_dev *dev,
|
|
int min_uV, int max_uV, unsigned *selector)
|
|
{
|
|
struct pbias_regulator_data *data = rdev_get_drvdata(dev);
|
|
const struct pbias_reg_info *info = data->info;
|
|
int ret, vmode;
|
|
|
|
if (min_uV <= 1800000)
|
|
vmode = 0;
|
|
else if (min_uV > 1800000)
|
|
vmode = info->vmode;
|
|
|
|
ret = regmap_update_bits(data->syscon, data->pbias_reg,
|
|
info->vmode, vmode);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pbias_regulator_get_voltage(struct regulator_dev *rdev)
|
|
{
|
|
struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
|
|
const struct pbias_reg_info *info = data->info;
|
|
int value, voltage;
|
|
|
|
regmap_read(data->syscon, data->pbias_reg, &value);
|
|
value &= info->vmode;
|
|
|
|
voltage = value ? 3000000 : 1800000;
|
|
|
|
return voltage;
|
|
}
|
|
|
|
static int pbias_regulator_enable(struct regulator_dev *rdev)
|
|
{
|
|
struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
|
|
const struct pbias_reg_info *info = data->info;
|
|
int ret;
|
|
|
|
ret = regmap_update_bits(data->syscon, data->pbias_reg,
|
|
info->enable_mask, info->enable);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pbias_regulator_disable(struct regulator_dev *rdev)
|
|
{
|
|
struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
|
|
const struct pbias_reg_info *info = data->info;
|
|
int ret;
|
|
|
|
ret = regmap_update_bits(data->syscon, data->pbias_reg,
|
|
info->enable_mask, 0);
|
|
return ret;
|
|
}
|
|
|
|
static int pbias_regulator_is_enable(struct regulator_dev *rdev)
|
|
{
|
|
struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
|
|
const struct pbias_reg_info *info = data->info;
|
|
int value;
|
|
|
|
regmap_read(data->syscon, data->pbias_reg, &value);
|
|
|
|
return (value & info->enable_mask) == info->enable_mask;
|
|
}
|
|
|
|
static struct regulator_ops pbias_regulator_voltage_ops = {
|
|
.set_voltage = pbias_regulator_set_voltage,
|
|
.get_voltage = pbias_regulator_get_voltage,
|
|
.enable = pbias_regulator_enable,
|
|
.disable = pbias_regulator_disable,
|
|
.is_enabled = pbias_regulator_is_enable,
|
|
};
|
|
|
|
static const struct pbias_reg_info pbias_mmc_omap2430 = {
|
|
.enable = BIT(1),
|
|
.enable_mask = BIT(1),
|
|
.vmode = BIT(0),
|
|
.enable_time = 100,
|
|
.name = "pbias_mmc_omap2430"
|
|
};
|
|
|
|
static const struct pbias_reg_info pbias_sim_omap3 = {
|
|
.enable = BIT(9),
|
|
.enable_mask = BIT(9),
|
|
.vmode = BIT(8),
|
|
.enable_time = 100,
|
|
.name = "pbias_sim_omap3"
|
|
};
|
|
|
|
static const struct pbias_reg_info pbias_mmc_omap4 = {
|
|
.enable = BIT(26) | BIT(22),
|
|
.enable_mask = BIT(26) | BIT(25) | BIT(22),
|
|
.vmode = BIT(21),
|
|
.enable_time = 100,
|
|
.name = "pbias_mmc_omap4"
|
|
};
|
|
|
|
static const struct pbias_reg_info pbias_mmc_omap5 = {
|
|
.enable = BIT(27) | BIT(26),
|
|
.enable_mask = BIT(27) | BIT(25) | BIT(26),
|
|
.vmode = BIT(21),
|
|
.enable_time = 100,
|
|
.name = "pbias_mmc_omap5"
|
|
};
|
|
|
|
static struct of_regulator_match pbias_matches[] = {
|
|
{ .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
|
|
{ .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
|
|
{ .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
|
|
{ .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
|
|
};
|
|
#define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
|
|
|
|
static const struct of_device_id pbias_of_match[] = {
|
|
{ .compatible = "ti,pbias-omap", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pbias_of_match);
|
|
|
|
static int pbias_regulator_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct pbias_regulator_data *drvdata;
|
|
struct resource *res;
|
|
struct regulator_config cfg = { };
|
|
struct regmap *syscon;
|
|
const struct pbias_reg_info *info;
|
|
int ret = 0;
|
|
int count, idx, data_idx = 0;
|
|
|
|
count = of_regulator_match(&pdev->dev, np, pbias_matches,
|
|
PBIAS_NUM_REGS);
|
|
if (count < 0)
|
|
return count;
|
|
|
|
drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
|
|
* count, GFP_KERNEL);
|
|
if (drvdata == NULL) {
|
|
dev_err(&pdev->dev, "Failed to allocate device data\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
|
|
if (IS_ERR(syscon))
|
|
return PTR_ERR(syscon);
|
|
|
|
cfg.dev = &pdev->dev;
|
|
|
|
for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
|
|
if (!pbias_matches[idx].init_data ||
|
|
!pbias_matches[idx].of_node)
|
|
continue;
|
|
|
|
info = pbias_matches[idx].driver_data;
|
|
if (!info)
|
|
return -ENODEV;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res)
|
|
return -EINVAL;
|
|
|
|
drvdata[data_idx].pbias_reg = res->start;
|
|
drvdata[data_idx].syscon = syscon;
|
|
drvdata[data_idx].info = info;
|
|
drvdata[data_idx].desc.name = info->name;
|
|
drvdata[data_idx].desc.owner = THIS_MODULE;
|
|
drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
|
|
drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
|
|
drvdata[data_idx].desc.n_voltages = 2;
|
|
drvdata[data_idx].desc.enable_time = info->enable_time;
|
|
|
|
cfg.init_data = pbias_matches[idx].init_data;
|
|
cfg.driver_data = &drvdata[data_idx];
|
|
cfg.of_node = pbias_matches[idx].of_node;
|
|
|
|
drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
|
|
&drvdata[data_idx].desc, &cfg);
|
|
if (IS_ERR(drvdata[data_idx].dev)) {
|
|
ret = PTR_ERR(drvdata[data_idx].dev);
|
|
dev_err(&pdev->dev,
|
|
"Failed to register regulator: %d\n", ret);
|
|
goto err_regulator;
|
|
}
|
|
data_idx++;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, drvdata);
|
|
|
|
err_regulator:
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver pbias_regulator_driver = {
|
|
.probe = pbias_regulator_probe,
|
|
.driver = {
|
|
.name = "pbias-regulator",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_match_ptr(pbias_of_match),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(pbias_regulator_driver);
|
|
|
|
MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
|
|
MODULE_DESCRIPTION("pbias voltage regulator");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:pbias-regulator");
|