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/*
* 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");
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