1*4882a593Smuzhiyun // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/interrupt.h>
7*4882a593Smuzhiyun #include <linux/irq.h>
8*4882a593Smuzhiyun #include <linux/kernel.h>
9*4882a593Smuzhiyun #include <linux/module.h>
10*4882a593Smuzhiyun #include <linux/mfd/syscon.h>
11*4882a593Smuzhiyun #include <linux/of_address.h>
12*4882a593Smuzhiyun #include <linux/of_device.h>
13*4882a593Smuzhiyun #include <linux/of_irq.h>
14*4882a593Smuzhiyun #include <linux/of.h>
15*4882a593Smuzhiyun #include <linux/platform_device.h>
16*4882a593Smuzhiyun #include <linux/regmap.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun struct rknpor_powergood_info {
19*4882a593Smuzhiyun int irq;
20*4882a593Smuzhiyun irq_handler_t isr;
21*4882a593Smuzhiyun struct regmap *grf;
22*4882a593Smuzhiyun u32 grf_offset;
23*4882a593Smuzhiyun u8 status_bits_shift;
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
rv1106_npor_powergood_isr(int irq,void * data)26*4882a593Smuzhiyun static irqreturn_t rv1106_npor_powergood_isr(int irq, void *data)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun struct rknpor_powergood_info *powergood = data;
29*4882a593Smuzhiyun u32 voltage = 0;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun while (!voltage) {
32*4882a593Smuzhiyun regmap_read(powergood->grf, powergood->grf_offset, &voltage);
33*4882a593Smuzhiyun voltage = (voltage >> powergood->status_bits_shift) & 0x1;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun pr_err("%s voltage jitter detected\n", __func__);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun return IRQ_HANDLED;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun static struct rknpor_powergood_info rv1106_soc_data = {
42*4882a593Smuzhiyun .grf_offset = 0x20020,
43*4882a593Smuzhiyun .status_bits_shift = 4,
44*4882a593Smuzhiyun .isr = rv1106_npor_powergood_isr,
45*4882a593Smuzhiyun };
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun static const struct of_device_id rockchip_npor_powergood_dt_match[] = {
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun .compatible = "rockchip,rv1106-npor-powergood",
50*4882a593Smuzhiyun .data = &rv1106_soc_data
51*4882a593Smuzhiyun },
52*4882a593Smuzhiyun {},
53*4882a593Smuzhiyun };
54*4882a593Smuzhiyun
rockchip_npor_powergood_probe(struct platform_device * pdev)55*4882a593Smuzhiyun static int rockchip_npor_powergood_probe(struct platform_device *pdev)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun struct rknpor_powergood_info *powergood;
58*4882a593Smuzhiyun const struct of_device_id *match;
59*4882a593Smuzhiyun struct device *dev = &pdev->dev;
60*4882a593Smuzhiyun int ret;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun match = of_match_node(rockchip_npor_powergood_dt_match, pdev->dev.of_node);
63*4882a593Smuzhiyun powergood = (struct rknpor_powergood_info *)match->data;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun if (!powergood)
66*4882a593Smuzhiyun return -EINVAL;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun if (dev->parent && dev->parent->of_node) {
69*4882a593Smuzhiyun powergood->grf = syscon_node_to_regmap(dev->parent->of_node);
70*4882a593Smuzhiyun if (IS_ERR(powergood->grf))
71*4882a593Smuzhiyun return dev_err_probe(&pdev->dev, PTR_ERR(powergood->grf), "fail to find grf\n");
72*4882a593Smuzhiyun }
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun powergood->irq = platform_get_irq(pdev, 0);
75*4882a593Smuzhiyun if (powergood->irq < 0)
76*4882a593Smuzhiyun return powergood->irq;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun ret = devm_request_irq(&pdev->dev, powergood->irq, powergood->isr, 0, "rknpor_powergood", powergood);
79*4882a593Smuzhiyun if (ret)
80*4882a593Smuzhiyun return dev_err_probe(&pdev->dev, ret, "request irq fail\n");
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun dev_info(&pdev->dev, "probe success!\n");
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun return 0;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun static struct platform_driver rockchip_npor_powergood_driver = {
88*4882a593Smuzhiyun .probe = rockchip_npor_powergood_probe,
89*4882a593Smuzhiyun .driver = {
90*4882a593Smuzhiyun .name = "rockchip,rknpor-powergood",
91*4882a593Smuzhiyun .of_match_table = rockchip_npor_powergood_dt_match,
92*4882a593Smuzhiyun },
93*4882a593Smuzhiyun };
94*4882a593Smuzhiyun
rockchip_npor_powergood_init(void)95*4882a593Smuzhiyun static int __init rockchip_npor_powergood_init(void)
96*4882a593Smuzhiyun {
97*4882a593Smuzhiyun return platform_driver_register(&rockchip_npor_powergood_driver);
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun subsys_initcall_sync(rockchip_npor_powergood_init);
100*4882a593Smuzhiyun MODULE_DESCRIPTION("Rockchip NPOR Powergood");
101*4882a593Smuzhiyun MODULE_LICENSE("GPL");
102