1/*
 2 * Copyright (C) 2017 Synopsys.
 3 *
 4 * Synopsys AXS10x reset driver.
 5 *
 6 * This file is licensed under the terms of the GNU General Public
 7 * License version 2. This program is licensed "as is" without any
 8 * warranty of any kind, whether express or implied.
 9 */
10
11#include <linux/io.h>
12#include <linux/module.h>
13#include <linux/mod_devicetable.h>
14#include <linux/platform_device.h>
15#include <linux/reset-controller.h>
16
17#define to_axs10x_rst(p)	container_of((p), struct axs10x_rst, rcdev)
18
19#define AXS10X_MAX_RESETS	32
20
21struct axs10x_rst {
22	void __iomem			*regs_rst;
23	spinlock_t			lock;
24	struct reset_controller_dev	rcdev;
25};
26
27static int axs10x_reset_reset(struct reset_controller_dev *rcdev,
28			      unsigned long id)
29{
30	struct axs10x_rst *rst = to_axs10x_rst(rcdev);
31	unsigned long flags;
32
33	spin_lock_irqsave(&rst->lock, flags);
34	writel(BIT(id), rst->regs_rst);
35	spin_unlock_irqrestore(&rst->lock, flags);
36
37	return 0;
38}
39
40static const struct reset_control_ops axs10x_reset_ops = {
41	.reset	= axs10x_reset_reset,
42};
43
44static int axs10x_reset_probe(struct platform_device *pdev)
45{
46	struct axs10x_rst *rst;
47	struct resource *mem;
48
49	rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL);
50	if (!rst)
51		return -ENOMEM;
52
53	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
54	rst->regs_rst = devm_ioremap_resource(&pdev->dev, mem);
55	if (IS_ERR(rst->regs_rst))
56		return PTR_ERR(rst->regs_rst);
57
58	spin_lock_init(&rst->lock);
59
60	rst->rcdev.owner = THIS_MODULE;
61	rst->rcdev.ops = &axs10x_reset_ops;
62	rst->rcdev.of_node = pdev->dev.of_node;
63	rst->rcdev.nr_resets = AXS10X_MAX_RESETS;
64
65	return devm_reset_controller_register(&pdev->dev, &rst->rcdev);
66}
67
68static const struct of_device_id axs10x_reset_dt_match[] = {
69	{ .compatible = "snps,axs10x-reset" },
70	{ },
71};
72
73static struct platform_driver axs10x_reset_driver = {
74	.probe	= axs10x_reset_probe,
75	.driver	= {
76		.name = "axs10x-reset",
77		.of_match_table = axs10x_reset_dt_match,
78	},
79};
80builtin_platform_driver(axs10x_reset_driver);
81
82MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
83MODULE_DESCRIPTION("Synopsys AXS10x reset driver");
84MODULE_LICENSE("GPL v2");

 1/*
 2 * Copyright (C) 2017 Synopsys.
 3 *
 4 * Synopsys AXS10x reset driver.
 5 *
 6 * This file is licensed under the terms of the GNU General Public
 7 * License version 2. This program is licensed "as is" without any
 8 * warranty of any kind, whether express or implied.
 9 */
10
11#include <linux/io.h>
12#include <linux/module.h>
13#include <linux/mod_devicetable.h>
14#include <linux/platform_device.h>
15#include <linux/reset-controller.h>
16
17#define to_axs10x_rst(p)	container_of((p), struct axs10x_rst, rcdev)
18
19#define AXS10X_MAX_RESETS	32
20
21struct axs10x_rst {
22	void __iomem			*regs_rst;
23	spinlock_t			lock;
24	struct reset_controller_dev	rcdev;
25};
26
27static int axs10x_reset_reset(struct reset_controller_dev *rcdev,
28			      unsigned long id)
29{
30	struct axs10x_rst *rst = to_axs10x_rst(rcdev);
31	unsigned long flags;
32
33	spin_lock_irqsave(&rst->lock, flags);
34	writel(BIT(id), rst->regs_rst);
35	spin_unlock_irqrestore(&rst->lock, flags);
36
37	return 0;
38}
39
40static const struct reset_control_ops axs10x_reset_ops = {
41	.reset	= axs10x_reset_reset,
42};
43
44static int axs10x_reset_probe(struct platform_device *pdev)
45{
46	struct axs10x_rst *rst;
47	struct resource *mem;
48
49	rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL);
50	if (!rst)
51		return -ENOMEM;
52
53	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
54	rst->regs_rst = devm_ioremap_resource(&pdev->dev, mem);
55	if (IS_ERR(rst->regs_rst))
56		return PTR_ERR(rst->regs_rst);
57
58	spin_lock_init(&rst->lock);
59
60	rst->rcdev.owner = THIS_MODULE;
61	rst->rcdev.ops = &axs10x_reset_ops;
62	rst->rcdev.of_node = pdev->dev.of_node;
63	rst->rcdev.nr_resets = AXS10X_MAX_RESETS;
64
65	return devm_reset_controller_register(&pdev->dev, &rst->rcdev);
66}
67
68static const struct of_device_id axs10x_reset_dt_match[] = {
69	{ .compatible = "snps,axs10x-reset" },
70	{ },
71};
72
73static struct platform_driver axs10x_reset_driver = {
74	.probe	= axs10x_reset_probe,
75	.driver	= {
76		.name = "axs10x-reset",
77		.of_match_table = axs10x_reset_dt_match,
78	},
79};
80builtin_platform_driver(axs10x_reset_driver);
81
82MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
83MODULE_DESCRIPTION("Synopsys AXS10x reset driver");
84MODULE_LICENSE("GPL v2");