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/*
* 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/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <mach/hardware.h>
static int ox820_reset_reset(struct reset_controller_dev *rcdev,
unsigned long id)
{
writel(BIT(id), SYS_CTRL_RST_SET_CTRL);
writel(BIT(id), SYS_CTRL_RST_CLR_CTRL);
return 0;
}
static int ox820_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
writel(BIT(id), SYS_CTRL_RST_SET_CTRL);
return 0;
}
static int ox820_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
writel(BIT(id), SYS_CTRL_RST_CLR_CTRL);
return 0;
}
static struct reset_control_ops ox820_reset_ops = {
.reset = ox820_reset_reset,
.assert = ox820_reset_assert,
.deassert = ox820_reset_deassert,
};
static const struct of_device_id ox820_reset_dt_ids[] = {
{ .compatible = "plxtech,nas782x-reset", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ox820_reset_dt_ids);
struct reset_controller_dev rcdev;
static int ox820_reset_probe(struct platform_device *pdev)
{
struct reset_controller_dev *rcdev;
rcdev = devm_kzalloc(&pdev->dev, sizeof(*rcdev), GFP_KERNEL);
if (!rcdev)
return -ENOMEM;
/* note: reset controller is statically mapped */
rcdev->owner = THIS_MODULE;
rcdev->nr_resets = 32;
rcdev->ops = &ox820_reset_ops;
rcdev->of_node = pdev->dev.of_node;
reset_controller_register(rcdev);
platform_set_drvdata(pdev, rcdev);
return 0;
}
static int ox820_reset_remove(struct platform_device *pdev)
{
struct reset_controller_dev *rcdev = platform_get_drvdata(pdev);
reset_controller_unregister(rcdev);
return 0;
}
static struct platform_driver ox820_reset_driver = {
.probe = ox820_reset_probe,
.remove = ox820_reset_remove,
.driver = {
.name = "ox820-reset",
.owner = THIS_MODULE,
.of_match_table = ox820_reset_dt_ids,
},
};
static int __init ox820_reset_init(void)
{
return platform_driver_probe(&ox820_reset_driver,
ox820_reset_probe);
}
/*
* reset controller does not support probe deferral, so it has to be
* initialized before any user, in particular, PCIE uses subsys_initcall.
*/
arch_initcall(ox820_reset_init);
MODULE_AUTHOR("Ma Haijun");
MODULE_LICENSE("GPL");
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