Merge tag 'nfs-for-4.15-3' of git://git.linux-nfs.org/projects/anna/linux-nfs
[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/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
20 struct axs10x_rst {
21         void __iomem                    *regs_rst;
22         spinlock_t                      lock;
23         struct reset_controller_dev     rcdev;
24 };
25
26 static 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
39 static const struct reset_control_ops axs10x_reset_ops = {
40         .reset  = axs10x_reset_reset,
41 };
42
43 static 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
67 static const struct of_device_id axs10x_reset_dt_match[] = {
68         { .compatible = "snps,axs10x-reset" },
69         { },
70 };
71
72 static 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 };
79 builtin_platform_driver(axs10x_reset_driver);
80
81 MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
82 MODULE_DESCRIPTION("Synopsys AXS10x reset driver");
83 MODULE_LICENSE("GPL v2");