1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 */
7
8#include <linux/err.h>
9#include <linux/io.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/platform_device.h>
13#include <linux/reset-controller.h>
14#include <linux/slab.h>
15#include <linux/types.h>
16#include <mach/hardware.h>
17
18static int ox820_reset_reset(struct reset_controller_dev *rcdev,
19			      unsigned long id)
20{
21	writel(BIT(id), SYS_CTRL_RST_SET_CTRL);
22	writel(BIT(id), SYS_CTRL_RST_CLR_CTRL);
23	return 0;
24}
25
26static int ox820_reset_assert(struct reset_controller_dev *rcdev,
27			      unsigned long id)
28{
29	writel(BIT(id), SYS_CTRL_RST_SET_CTRL);
30
31	return 0;
32}
33
34static int ox820_reset_deassert(struct reset_controller_dev *rcdev,
35				unsigned long id)
36{
37	writel(BIT(id), SYS_CTRL_RST_CLR_CTRL);
38
39	return 0;
40}
41
42static struct reset_control_ops ox820_reset_ops = {
43	.reset		= ox820_reset_reset,
44	.assert		= ox820_reset_assert,
45	.deassert	= ox820_reset_deassert,
46};
47
48static const struct of_device_id ox820_reset_dt_ids[] = {
49	 { .compatible = "plxtech,nas782x-reset", },
50	 { /* sentinel */ },
51};
52MODULE_DEVICE_TABLE(of, ox820_reset_dt_ids);
53
54struct reset_controller_dev rcdev;
55
56static int ox820_reset_probe(struct platform_device *pdev)
57{
58	struct reset_controller_dev *rcdev;
59
60	rcdev = devm_kzalloc(&pdev->dev, sizeof(*rcdev), GFP_KERNEL);
61	if (!rcdev)
62		return -ENOMEM;
63
64	/* note: reset controller is statically mapped */
65
66	rcdev->owner = THIS_MODULE;
67	rcdev->nr_resets = 32;
68	rcdev->ops = &ox820_reset_ops;
69	rcdev->of_node = pdev->dev.of_node;
70	reset_controller_register(rcdev);
71	platform_set_drvdata(pdev, rcdev);
72
73	return 0;
74}
75
76static int ox820_reset_remove(struct platform_device *pdev)
77{
78	struct reset_controller_dev *rcdev = platform_get_drvdata(pdev);
79
80	reset_controller_unregister(rcdev);
81
82	return 0;
83}
84
85static struct platform_driver ox820_reset_driver = {
86	.probe	= ox820_reset_probe,
87	.remove	= ox820_reset_remove,
88	.driver = {
89		.name		= "ox820-reset",
90		.owner		= THIS_MODULE,
91		.of_match_table	= ox820_reset_dt_ids,
92	},
93};
94
95static int __init ox820_reset_init(void)
96{
97	return platform_driver_probe(&ox820_reset_driver,
98				     ox820_reset_probe);
99}
100/*
101 * reset controller does not support probe deferral, so it has to be
102 * initialized before any user, in particular, PCIE uses subsys_initcall.
103 */
104arch_initcall(ox820_reset_init);
105
106MODULE_AUTHOR("Ma Haijun");
107MODULE_LICENSE("GPL");
108