100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
|
|
* ZTE's zx2967 family reset controller driver
|
|
*
|
|
* Copyright (C) 2017 ZTE Ltd.
|
|
*
|
|
* Author: Baoyou Xie <baoyou.xie@linaro.org>
|
|
*
|
|
* License terms: GNU General Public License (GPL) version 2
|
|
*/
|
|
|
|
#include <linux/of_address.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reset-controller.h>
|
|
|
|
struct zx2967_reset {
|
|
void __iomem *reg_base;
|
|
spinlock_t lock;
|
|
struct reset_controller_dev rcdev;
|
|
};
|
|
|
|
static int zx2967_reset_act(struct reset_controller_dev *rcdev,
|
|
unsigned long id, bool assert)
|
|
{
|
|
struct zx2967_reset *reset = NULL;
|
|
int bank = id / 32;
|
|
int offset = id % 32;
|
|
u32 reg;
|
|
unsigned long flags;
|
|
|
|
reset = container_of(rcdev, struct zx2967_reset, rcdev);
|
|
|
|
spin_lock_irqsave(&reset->lock, flags);
|
|
|
|
reg = readl_relaxed(reset->reg_base + (bank * 4));
|
|
if (assert)
|
|
reg &= ~BIT(offset);
|
|
else
|
|
reg |= BIT(offset);
|
|
writel_relaxed(reg, reset->reg_base + (bank * 4));
|
|
|
|
spin_unlock_irqrestore(&reset->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int zx2967_reset_assert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
return zx2967_reset_act(rcdev, id, true);
|
|
}
|
|
|
|
static int zx2967_reset_deassert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
return zx2967_reset_act(rcdev, id, false);
|
|
}
|
|
|
|
static struct reset_control_ops zx2967_reset_ops = {
|
|
.assert = zx2967_reset_assert,
|
|
.deassert = zx2967_reset_deassert,
|
|
};
|
|
|
|
static int zx2967_reset_probe(struct platform_device *pdev)
|
|
{
|
|
struct zx2967_reset *reset;
|
|
struct resource *res;
|
|
|
|
reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
|
|
if (!reset)
|
|
return -ENOMEM;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
reset->reg_base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(reset->reg_base))
|
|
return PTR_ERR(reset->reg_base);
|
|
|
|
spin_lock_init(&reset->lock);
|
|
|
|
reset->rcdev.owner = THIS_MODULE;
|
|
reset->rcdev.nr_resets = resource_size(res) * 8;
|
|
reset->rcdev.ops = &zx2967_reset_ops;
|
|
reset->rcdev.of_node = pdev->dev.of_node;
|
|
|
|
return devm_reset_controller_register(&pdev->dev, &reset->rcdev);
|
|
}
|
|
|
|
static const struct of_device_id zx2967_reset_dt_ids[] = {
|
|
{ .compatible = "zte,zx296718-reset", },
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver zx2967_reset_driver = {
|
|
.probe = zx2967_reset_probe,
|
|
.driver = {
|
|
.name = "zx2967-reset",
|
|
.of_match_table = zx2967_reset_dt_ids,
|
|
},
|
|
};
|
|
builtin_platform_driver(zx2967_reset_driver);
|