mirror of https://gitee.com/openkylin/linux.git
110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
/*
|
|
* 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);
|