forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
3.1 KiB
127 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Copyright (c) 2016-2017 Linaro Ltd. |
|
* Copyright (c) 2016-2017 HiSilicon Technologies Co., Ltd. |
|
*/ |
|
#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 const 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, "hisilicon,rst-syscon"); |
|
if (rc->map == ERR_PTR(-ENODEV)) { |
|
/* fall back to the deprecated compatible */ |
|
rc->map = syscon_regmap_lookup_by_phandle(np, |
|
"hisi,rst-syscon"); |
|
} |
|
if (IS_ERR(rc->map)) { |
|
dev_err(dev, "failed to get hisilicon,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");
|
|
|