// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
|
/*
|
* Copyright (c) 2022 Rockchip Electronics Co., Ltd.
|
*/
|
|
#include <linux/interrupt.h>
|
#include <linux/irq.h>
|
#include <linux/kernel.h>
|
#include <linux/module.h>
|
#include <linux/mfd/syscon.h>
|
#include <linux/of_address.h>
|
#include <linux/of_device.h>
|
#include <linux/of_irq.h>
|
#include <linux/of.h>
|
#include <linux/platform_device.h>
|
#include <linux/regmap.h>
|
|
struct rknpor_powergood_info {
|
int irq;
|
irq_handler_t isr;
|
struct regmap *grf;
|
u32 grf_offset;
|
u8 status_bits_shift;
|
};
|
|
static irqreturn_t rv1106_npor_powergood_isr(int irq, void *data)
|
{
|
struct rknpor_powergood_info *powergood = data;
|
u32 voltage = 0;
|
|
while (!voltage) {
|
regmap_read(powergood->grf, powergood->grf_offset, &voltage);
|
voltage = (voltage >> powergood->status_bits_shift) & 0x1;
|
}
|
|
pr_err("%s voltage jitter detected\n", __func__);
|
|
return IRQ_HANDLED;
|
}
|
|
static struct rknpor_powergood_info rv1106_soc_data = {
|
.grf_offset = 0x20020,
|
.status_bits_shift = 4,
|
.isr = rv1106_npor_powergood_isr,
|
};
|
|
static const struct of_device_id rockchip_npor_powergood_dt_match[] = {
|
{
|
.compatible = "rockchip,rv1106-npor-powergood",
|
.data = &rv1106_soc_data
|
},
|
{},
|
};
|
|
static int rockchip_npor_powergood_probe(struct platform_device *pdev)
|
{
|
struct rknpor_powergood_info *powergood;
|
const struct of_device_id *match;
|
struct device *dev = &pdev->dev;
|
int ret;
|
|
match = of_match_node(rockchip_npor_powergood_dt_match, pdev->dev.of_node);
|
powergood = (struct rknpor_powergood_info *)match->data;
|
|
if (!powergood)
|
return -EINVAL;
|
|
if (dev->parent && dev->parent->of_node) {
|
powergood->grf = syscon_node_to_regmap(dev->parent->of_node);
|
if (IS_ERR(powergood->grf))
|
return dev_err_probe(&pdev->dev, PTR_ERR(powergood->grf), "fail to find grf\n");
|
}
|
|
powergood->irq = platform_get_irq(pdev, 0);
|
if (powergood->irq < 0)
|
return powergood->irq;
|
|
ret = devm_request_irq(&pdev->dev, powergood->irq, powergood->isr, 0, "rknpor_powergood", powergood);
|
if (ret)
|
return dev_err_probe(&pdev->dev, ret, "request irq fail\n");
|
|
dev_info(&pdev->dev, "probe success!\n");
|
|
return 0;
|
}
|
|
static struct platform_driver rockchip_npor_powergood_driver = {
|
.probe = rockchip_npor_powergood_probe,
|
.driver = {
|
.name = "rockchip,rknpor-powergood",
|
.of_match_table = rockchip_npor_powergood_dt_match,
|
},
|
};
|
|
static int __init rockchip_npor_powergood_init(void)
|
{
|
return platform_driver_register(&rockchip_npor_powergood_driver);
|
}
|
subsys_initcall_sync(rockchip_npor_powergood_init);
|
MODULE_DESCRIPTION("Rockchip NPOR Powergood");
|
MODULE_LICENSE("GPL");
|
