2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
10 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/reset-controller.h>
14 #include <linux/slab.h>
15 #include <linux/types.h>
16 #include <mach/hardware.h>
18 static int ox820_reset_reset(struct reset_controller_dev *rcdev,
21 writel(BIT(id), SYS_CTRL_RST_SET_CTRL);
22 writel(BIT(id), SYS_CTRL_RST_CLR_CTRL);
26 static int ox820_reset_assert(struct reset_controller_dev *rcdev,
29 writel(BIT(id), SYS_CTRL_RST_SET_CTRL);
34 static int ox820_reset_deassert(struct reset_controller_dev *rcdev,
37 writel(BIT(id), SYS_CTRL_RST_CLR_CTRL);
42 static struct reset_control_ops ox820_reset_ops = {
43 .reset = ox820_reset_reset,
44 .assert = ox820_reset_assert,
45 .deassert = ox820_reset_deassert,
48 static const struct of_device_id ox820_reset_dt_ids[] = {
49 { .compatible = "plxtech,nas782x-reset", },
52 MODULE_DEVICE_TABLE(of, ox820_reset_dt_ids);
54 struct reset_controller_dev rcdev;
56 static int ox820_reset_probe(struct platform_device *pdev)
58 struct reset_controller_dev *rcdev;
60 rcdev = devm_kzalloc(&pdev->dev, sizeof(*rcdev), GFP_KERNEL);
64 /* note: reset controller is statically mapped */
66 rcdev->owner = THIS_MODULE;
67 rcdev->nr_resets = 32;
68 rcdev->ops = &ox820_reset_ops;
69 rcdev->of_node = pdev->dev.of_node;
70 reset_controller_register(rcdev);
71 platform_set_drvdata(pdev, rcdev);
76 static int ox820_reset_remove(struct platform_device *pdev)
78 struct reset_controller_dev *rcdev = platform_get_drvdata(pdev);
80 reset_controller_unregister(rcdev);
85 static struct platform_driver ox820_reset_driver = {
86 .probe = ox820_reset_probe,
87 .remove = ox820_reset_remove,
89 .name = "ox820-reset",
91 .of_match_table = ox820_reset_dt_ids,
95 static int __init ox820_reset_init(void)
97 return platform_driver_probe(&ox820_reset_driver,
101 * reset controller does not support probe deferral, so it has to be
102 * initialized before any user, in particular, PCIE uses subsys_initcall.
104 arch_initcall(ox820_reset_init);
106 MODULE_AUTHOR("Ma Haijun");
107 MODULE_LICENSE("GPL");