// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* Copyright Intel Corporation (C) 2017. All Rights Reserved
|
*
|
* Reset driver for Altera Arria10 MAX5 System Resource Chip
|
*
|
* Adapted from reset-socfpga.c
|
*/
|
|
#include <linux/err.h>
|
#include <linux/mfd/altera-a10sr.h>
|
#include <linux/module.h>
|
#include <linux/of.h>
|
#include <linux/platform_device.h>
|
#include <linux/reset-controller.h>
|
|
#include <dt-bindings/reset/altr,rst-mgr-a10sr.h>
|
|
struct a10sr_reset {
|
struct reset_controller_dev rcdev;
|
struct regmap *regmap;
|
};
|
|
static inline struct a10sr_reset *to_a10sr_rst(struct reset_controller_dev *rc)
|
{
|
return container_of(rc, struct a10sr_reset, rcdev);
|
}
|
|
static inline int a10sr_reset_shift(unsigned long id)
|
{
|
switch (id) {
|
case A10SR_RESET_ENET_HPS:
|
return 1;
|
case A10SR_RESET_PCIE:
|
case A10SR_RESET_FILE:
|
case A10SR_RESET_BQSPI:
|
case A10SR_RESET_USB:
|
return id + 11;
|
default:
|
return -EINVAL;
|
}
|
}
|
|
static int a10sr_reset_update(struct reset_controller_dev *rcdev,
|
unsigned long id, bool assert)
|
{
|
struct a10sr_reset *a10r = to_a10sr_rst(rcdev);
|
int offset = a10sr_reset_shift(id);
|
u8 mask = ALTR_A10SR_REG_BIT_MASK(offset);
|
int index = ALTR_A10SR_HPS_RST_REG + ALTR_A10SR_REG_OFFSET(offset);
|
|
return regmap_update_bits(a10r->regmap, index, mask, assert ? 0 : mask);
|
}
|
|
static int a10sr_reset_assert(struct reset_controller_dev *rcdev,
|
unsigned long id)
|
{
|
return a10sr_reset_update(rcdev, id, true);
|
}
|
|
static int a10sr_reset_deassert(struct reset_controller_dev *rcdev,
|
unsigned long id)
|
{
|
return a10sr_reset_update(rcdev, id, false);
|
}
|
|
static int a10sr_reset_status(struct reset_controller_dev *rcdev,
|
unsigned long id)
|
{
|
int ret;
|
struct a10sr_reset *a10r = to_a10sr_rst(rcdev);
|
int offset = a10sr_reset_shift(id);
|
u8 mask = ALTR_A10SR_REG_BIT_MASK(offset);
|
int index = ALTR_A10SR_HPS_RST_REG + ALTR_A10SR_REG_OFFSET(offset);
|
unsigned int value;
|
|
ret = regmap_read(a10r->regmap, index, &value);
|
if (ret < 0)
|
return ret;
|
|
return !!(value & mask);
|
}
|
|
static const struct reset_control_ops a10sr_reset_ops = {
|
.assert = a10sr_reset_assert,
|
.deassert = a10sr_reset_deassert,
|
.status = a10sr_reset_status,
|
};
|
|
static int a10sr_reset_probe(struct platform_device *pdev)
|
{
|
struct altr_a10sr *a10sr = dev_get_drvdata(pdev->dev.parent);
|
struct a10sr_reset *a10r;
|
|
a10r = devm_kzalloc(&pdev->dev, sizeof(struct a10sr_reset),
|
GFP_KERNEL);
|
if (!a10r)
|
return -ENOMEM;
|
|
a10r->rcdev.owner = THIS_MODULE;
|
a10r->rcdev.nr_resets = A10SR_RESET_NUM;
|
a10r->rcdev.ops = &a10sr_reset_ops;
|
a10r->rcdev.of_node = pdev->dev.of_node;
|
a10r->regmap = a10sr->regmap;
|
|
platform_set_drvdata(pdev, a10r);
|
|
return devm_reset_controller_register(&pdev->dev, &a10r->rcdev);
|
}
|
|
static const struct of_device_id a10sr_reset_of_match[] = {
|
{ .compatible = "altr,a10sr-reset" },
|
{ },
|
};
|
MODULE_DEVICE_TABLE(of, a10sr_reset_of_match);
|
|
static struct platform_driver a10sr_reset_driver = {
|
.probe = a10sr_reset_probe,
|
.driver = {
|
.name = "altr_a10sr_reset",
|
.of_match_table = a10sr_reset_of_match,
|
},
|
};
|
module_platform_driver(a10sr_reset_driver);
|
|
MODULE_AUTHOR("Thor Thayer <thor.thayer@linux.intel.com>");
|
MODULE_DESCRIPTION("Altera Arria10 System Resource Reset Controller Driver");
|
MODULE_LICENSE("GPL v2");
|
