mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 06:50:58 +07:00
1527058736
Add hi3660 reset driver
Example of dts usage:
iomcu_rst: iomcu_rst_controller {
compatible = "hisilicon,hi3660-reset";
hisi,rst-syscon = <&iomcu>;
#reset-cells = <2>;
};
i2c0: i2c@..... {
...
resets = <&iomcu_rst 0x20 3>; /* offset: 0x20; bit: 3 */
...
};
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2016-2017 Linaro Ltd.
|
|
* Copyright (c) 2016-2017 HiSilicon Technologies Co., Ltd.
|
|
*
|
|
* 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/reset-controller.h>
|
|
|
|
struct hi3660_reset_controller {
|
|
struct reset_controller_dev rst;
|
|
struct regmap *map;
|
|
};
|
|
|
|
#define to_hi3660_reset_controller(_rst) \
|
|
container_of(_rst, struct hi3660_reset_controller, rst)
|
|
|
|
static int hi3660_reset_program_hw(struct reset_controller_dev *rcdev,
|
|
unsigned long idx, bool assert)
|
|
{
|
|
struct hi3660_reset_controller *rc = to_hi3660_reset_controller(rcdev);
|
|
unsigned int offset = idx >> 8;
|
|
unsigned int mask = BIT(idx & 0x1f);
|
|
|
|
if (assert)
|
|
return regmap_write(rc->map, offset, mask);
|
|
else
|
|
return regmap_write(rc->map, offset + 4, mask);
|
|
}
|
|
|
|
static int hi3660_reset_assert(struct reset_controller_dev *rcdev,
|
|
unsigned long idx)
|
|
{
|
|
return hi3660_reset_program_hw(rcdev, idx, true);
|
|
}
|
|
|
|
static int hi3660_reset_deassert(struct reset_controller_dev *rcdev,
|
|
unsigned long idx)
|
|
{
|
|
return hi3660_reset_program_hw(rcdev, idx, false);
|
|
}
|
|
|
|
static int hi3660_reset_dev(struct reset_controller_dev *rcdev,
|
|
unsigned long idx)
|
|
{
|
|
int err;
|
|
|
|
err = hi3660_reset_assert(rcdev, idx);
|
|
if (err)
|
|
return err;
|
|
|
|
return hi3660_reset_deassert(rcdev, idx);
|
|
}
|
|
|
|
static struct reset_control_ops hi3660_reset_ops = {
|
|
.reset = hi3660_reset_dev,
|
|
.assert = hi3660_reset_assert,
|
|
.deassert = hi3660_reset_deassert,
|
|
};
|
|
|
|
static int hi3660_reset_xlate(struct reset_controller_dev *rcdev,
|
|
const struct of_phandle_args *reset_spec)
|
|
{
|
|
unsigned int offset, bit;
|
|
|
|
offset = reset_spec->args[0];
|
|
bit = reset_spec->args[1];
|
|
|
|
return (offset << 8) | bit;
|
|
}
|
|
|
|
static int hi3660_reset_probe(struct platform_device *pdev)
|
|
{
|
|
struct hi3660_reset_controller *rc;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct device *dev = &pdev->dev;
|
|
|
|
rc = devm_kzalloc(dev, sizeof(*rc), GFP_KERNEL);
|
|
if (!rc)
|
|
return -ENOMEM;
|
|
|
|
rc->map = syscon_regmap_lookup_by_phandle(np, "hisi,rst-syscon");
|
|
if (IS_ERR(rc->map)) {
|
|
dev_err(dev, "failed to get hi3660,rst-syscon\n");
|
|
return PTR_ERR(rc->map);
|
|
}
|
|
|
|
rc->rst.ops = &hi3660_reset_ops,
|
|
rc->rst.of_node = np;
|
|
rc->rst.of_reset_n_cells = 2;
|
|
rc->rst.of_xlate = hi3660_reset_xlate;
|
|
|
|
return reset_controller_register(&rc->rst);
|
|
}
|
|
|
|
static const struct of_device_id hi3660_reset_match[] = {
|
|
{ .compatible = "hisilicon,hi3660-reset", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, hi3660_reset_match);
|
|
|
|
static struct platform_driver hi3660_reset_driver = {
|
|
.probe = hi3660_reset_probe,
|
|
.driver = {
|
|
.name = "hi3660-reset",
|
|
.of_match_table = hi3660_reset_match,
|
|
},
|
|
};
|
|
|
|
static int __init hi3660_reset_init(void)
|
|
{
|
|
return platform_driver_register(&hi3660_reset_driver);
|
|
}
|
|
arch_initcall(hi3660_reset_init);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:hi3660-reset");
|
|
MODULE_DESCRIPTION("HiSilicon Hi3660 Reset Driver");
|