Merge branch 'for-5.15/logitech' into for-linus
[linux-2.6-microblaze.git] / drivers / reset / reset-axs10x.c
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
21 struct axs10x_rst {
22         void __iomem                    *regs_rst;
23         spinlock_t                      lock;
24         struct reset_controller_dev     rcdev;
25 };
26
27 static 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
40 static const struct reset_control_ops axs10x_reset_ops = {
41         .reset  = axs10x_reset_reset,
42 };
43
44 static 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
68 static const struct of_device_id axs10x_reset_dt_match[] = {
69         { .compatible = "snps,axs10x-reset" },
70         { },
71 };
72
73 static 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 };
80 builtin_platform_driver(axs10x_reset_driver);
81
82 MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
83 MODULE_DESCRIPTION("Synopsys AXS10x reset driver");
84 MODULE_LICENSE("GPL v2");