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/*
* Hisilicon Hi6220 reset controller driver
*
* Copyright (c) 2015 Hisilicon Limited.
*
* Author: Feng Chen <puck.chen@hisilicon.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/io.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/of.h>
#include <linux/reset-controller.h>
#include <linux/reset.h>
#include <linux/platform_device.h>
#define ASSERT_OFFSET 0x300
#define DEASSERT_OFFSET 0x304
#define MAX_INDEX 0x509
#define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev)
struct hi6220_reset_data {
void __iomem *assert_base;
void __iomem *deassert_base;
struct reset_controller_dev rc_dev;
};
static int hi6220_reset_assert(struct reset_controller_dev *rc_dev,
unsigned long idx)
{
struct hi6220_reset_data *data = to_reset_data(rc_dev);
int bank = idx >> 8;
int offset = idx & 0xff;
writel(BIT(offset), data->assert_base + (bank * 0x10));
return 0;
}
static int hi6220_reset_deassert(struct reset_controller_dev *rc_dev,
unsigned long idx)
{
struct hi6220_reset_data *data = to_reset_data(rc_dev);
int bank = idx >> 8;
int offset = idx & 0xff;
writel(BIT(offset), data->deassert_base + (bank * 0x10));
return 0;
}
static struct reset_control_ops hi6220_reset_ops = {
.assert = hi6220_reset_assert,
.deassert = hi6220_reset_deassert,
};
static int hi6220_reset_probe(struct platform_device *pdev)
{
struct hi6220_reset_data *data;
struct resource *res;
void __iomem *src_base;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
src_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(src_base))
return PTR_ERR(src_base);
data->assert_base = src_base + ASSERT_OFFSET;
data->deassert_base = src_base + DEASSERT_OFFSET;
data->rc_dev.nr_resets = MAX_INDEX;
data->rc_dev.ops = &hi6220_reset_ops;
data->rc_dev.of_node = pdev->dev.of_node;
reset_controller_register(&data->rc_dev);
return 0;
}
static const struct of_device_id hi6220_reset_match[] = {
{ .compatible = "hisilicon,hi6220-sysctrl" },
{ },
};
static struct platform_driver hi6220_reset_driver = {
.probe = hi6220_reset_probe,
.driver = {
.name = "reset-hi6220",
.of_match_table = hi6220_reset_match,
},
};
static int __init hi6220_reset_init(void)
{
return platform_driver_register(&hi6220_reset_driver);
}
postcore_initcall(hi6220_reset_init);
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