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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017, 2019, The Linux Foundation. All rights reserved. */
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#define REFGEN_REG_BIAS_EN 0x08
#define REFGEN_BIAS_EN_MASK GENMASK(2, 0)
#define REFGEN_BIAS_EN_ENABLE 0x7
#define REFGEN_BIAS_EN_DISABLE 0x6
#define REFGEN_REG_BG_CTRL 0x14
#define REFGEN_BG_CTRL_MASK GENMASK(2, 1)
#define REFGEN_BG_CTRL_ENABLE 0x6
#define REFGEN_BG_CTRL_DISABLE 0x4
#define REFGEN_REG_PWRDWN_CTRL5 0x80
#define REFGEN_PWRDWN_CTRL5_MASK GENMASK(0, 0)
#define REFGEN_PWRDWN_CTRL5_ENABLE 0x1
#define REFGEN_PWRDWN_CTRL5_DISABLE 0x0
struct refgen {
struct regulator_desc rdesc;
struct regulator_dev *rdev;
void __iomem *addr;
};
static void masked_writel(u32 val, u32 mask, void __iomem *addr)
{
u32 reg;
reg = readl_relaxed(addr);
reg = (reg & ~mask) | (val & mask);
writel_relaxed(reg, addr);
}
static int refgen_enable(struct regulator_dev *rdev)
{
struct refgen *vreg = rdev_get_drvdata(rdev);
masked_writel(REFGEN_BG_CTRL_ENABLE, REFGEN_BG_CTRL_MASK,
vreg->addr + REFGEN_REG_BG_CTRL);
writel_relaxed(REFGEN_BIAS_EN_ENABLE, vreg->addr + REFGEN_REG_BIAS_EN);
return 0;
}
static int refgen_disable(struct regulator_dev *rdev)
{
struct refgen *vreg = rdev_get_drvdata(rdev);
writel_relaxed(REFGEN_BIAS_EN_DISABLE, vreg->addr + REFGEN_REG_BIAS_EN);
masked_writel(REFGEN_BG_CTRL_DISABLE, REFGEN_BG_CTRL_MASK,
vreg->addr + REFGEN_REG_BG_CTRL);
return 0;
}
static int refgen_is_enabled(struct regulator_dev *rdev)
{
struct refgen *vreg = rdev_get_drvdata(rdev);
u32 val;
val = readl_relaxed(vreg->addr + REFGEN_REG_BG_CTRL);
if ((val & REFGEN_BG_CTRL_MASK) != REFGEN_BG_CTRL_ENABLE)
return 0;
val = readl_relaxed(vreg->addr + REFGEN_REG_BIAS_EN);
if ((val & REFGEN_BIAS_EN_MASK) != REFGEN_BIAS_EN_ENABLE)
return 0;
return 1;
}
static struct regulator_ops refgen_ops = {
.enable = refgen_enable,
.disable = refgen_disable,
.is_enabled = refgen_is_enabled,
};
static int refgen_kona_enable(struct regulator_dev *rdev)
{
struct refgen *vreg = rdev_get_drvdata(rdev);
masked_writel(REFGEN_PWRDWN_CTRL5_ENABLE, REFGEN_PWRDWN_CTRL5_MASK,
vreg->addr + REFGEN_REG_PWRDWN_CTRL5);
return 0;
}
static int refgen_kona_disable(struct regulator_dev *rdev)
{
struct refgen *vreg = rdev_get_drvdata(rdev);
masked_writel(REFGEN_PWRDWN_CTRL5_DISABLE, REFGEN_PWRDWN_CTRL5_MASK,
vreg->addr + REFGEN_REG_PWRDWN_CTRL5);
return 0;
}
static int refgen_kona_is_enabled(struct regulator_dev *rdev)
{
struct refgen *vreg = rdev_get_drvdata(rdev);
u32 val;
val = readl_relaxed(vreg->addr + REFGEN_REG_PWRDWN_CTRL5);
return (val & REFGEN_PWRDWN_CTRL5_MASK) == REFGEN_PWRDWN_CTRL5_ENABLE;
}
static struct regulator_ops refgen_kona_ops = {
.enable = refgen_kona_enable,
.disable = refgen_kona_disable,
.is_enabled = refgen_kona_is_enabled,
};
static const struct of_device_id refgen_match_table[] = {
{ .compatible = "qcom,refgen-regulator", .data = &refgen_ops},
{ .compatible = "qcom,refgen-sdm845-regulator", .data = &refgen_ops},
{ .compatible = "qcom,refgen-kona-regulator", .data = &refgen_kona_ops},
{}
};
static int refgen_probe(struct platform_device *pdev)
{
struct regulator_config config = {};
struct regulator_init_data *init_data = NULL;
struct device *dev = &pdev->dev;
struct regulator_desc *rdesc;
struct resource *res;
struct refgen *vreg;
int rc;
vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL);
if (!vreg)
return -ENOMEM;
if (!dev->of_node) {
dev_err(dev, "%s: device tree node missing\n", __func__);
return -ENODEV;
}
vreg->rdesc.ops = of_device_get_match_data(dev);
if (!vreg->rdesc.ops) {
dev_err(dev, "%s: could not find compatible string match\n",
__func__);
return -ENODEV;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res || !res->start) {
dev_err(dev, "reg address is missing\n");
return -EINVAL;
}
vreg->addr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(vreg->addr)) {
rc = PTR_ERR(vreg->addr);
dev_err(dev, "ioremap failed, rc=%d\n", rc);
return rc;
}
init_data = of_get_regulator_init_data(dev, dev->of_node, &vreg->rdesc);
if (!init_data)
return -ENOMEM;
if (init_data->constraints.name == NULL) {
dev_err(dev, "%s: regulator-name not specified\n", __func__);
return -EINVAL;
}
if (of_get_property(dev->of_node, "parent-supply", NULL))
init_data->supply_regulator = "parent";
rdesc = &vreg->rdesc;
rdesc->name = "refgen";
rdesc->id = pdev->id;
rdesc->owner = THIS_MODULE;
rdesc->type = REGULATOR_VOLTAGE;
config.dev = dev;
config.init_data = init_data;
config.driver_data = vreg;
config.of_node = dev->of_node;
vreg->rdev = devm_regulator_register(dev, rdesc, &config);
if (IS_ERR(vreg->rdev)) {
rc = PTR_ERR(vreg->rdev);
if (rc != -EPROBE_DEFER)
dev_err(dev, "%s: regulator register failed\n",
__func__);
return rc;
}
return 0;
}
static struct platform_driver refgen_driver = {
.probe = refgen_probe,
.driver = {
.name = "qcom,refgen-regulator",
.of_match_table = refgen_match_table,
.sync_state = regulator_sync_state,
},
};
static int __init refgen_init(void)
{
return platform_driver_register(&refgen_driver);
}
arch_initcall(refgen_init);
static void __exit refgen_exit(void)
{
platform_driver_unregister(&refgen_driver);
}
module_exit(refgen_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("refgen regulator driver");
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