tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/platform_device.h>
14#include <linux/reset-controller.h>
15
16#define to_axs10x_rst(p) container_of((p), struct axs10x_rst, rcdev)
17
18#define AXS10X_MAX_RESETS 32
19
20struct axs10x_rst {
21 void __iomem *regs_rst;
22 spinlock_t lock;
23 struct reset_controller_dev rcdev;
24};
25
26static int axs10x_reset_reset(struct reset_controller_dev *rcdev,
27 unsigned long id)
28{
29 struct axs10x_rst *rst = to_axs10x_rst(rcdev);
30 unsigned long flags;
31
32 spin_lock_irqsave(&rst->lock, flags);
33 writel(BIT(id), rst->regs_rst);
34 spin_unlock_irqrestore(&rst->lock, flags);
35
36 return 0;
37}
38
39static const struct reset_control_ops axs10x_reset_ops = {
40 .reset = axs10x_reset_reset,
41};
42
43static int axs10x_reset_probe(struct platform_device *pdev)
44{
45 struct axs10x_rst *rst;
46 struct resource *mem;
47
48 rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL);
49 if (!rst)
50 return -ENOMEM;
51
52 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
53 rst->regs_rst = devm_ioremap_resource(&pdev->dev, mem);
54 if (IS_ERR(rst->regs_rst))
55 return PTR_ERR(rst->regs_rst);
56
57 spin_lock_init(&rst->lock);
58
59 rst->rcdev.owner = THIS_MODULE;
60 rst->rcdev.ops = &axs10x_reset_ops;
61 rst->rcdev.of_node = pdev->dev.of_node;
62 rst->rcdev.nr_resets = AXS10X_MAX_RESETS;
63
64 return devm_reset_controller_register(&pdev->dev, &rst->rcdev);
65}
66
67static const struct of_device_id axs10x_reset_dt_match[] = {
68 { .compatible = "snps,axs10x-reset" },
69 { },
70};
71
72static struct platform_driver axs10x_reset_driver = {
73 .probe = axs10x_reset_probe,
74 .driver = {
75 .name = "axs10x-reset",
76 .of_match_table = axs10x_reset_dt_match,
77 },
78};
79builtin_platform_driver(axs10x_reset_driver);
80
81MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
82MODULE_DESCRIPTION("Synopsys AXS10x reset driver");
83MODULE_LICENSE("GPL v2");