Commit | Line | Data |
---|---|---|
37634923 EP |
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"); |