tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License version 2 as published
4 * by the Free Software Foundation.
5 *
6 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
7 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
8 * Copyright (C) 2013 John Crispin <john@phrozen.org>
9 */
10
11#include <linux/pm.h>
12#include <linux/io.h>
13#include <linux/of.h>
14#include <linux/delay.h>
15#include <linux/reset-controller.h>
16
17#include <asm/reboot.h>
18
19#include <asm/mach-ralink/ralink_regs.h>
20
21/* Reset Control */
22#define SYSC_REG_RESET_CTRL 0x034
23
24#define RSTCTL_RESET_PCI BIT(26)
25#define RSTCTL_RESET_SYSTEM BIT(0)
26
27static int ralink_assert_device(struct reset_controller_dev *rcdev,
28 unsigned long id)
29{
30 u32 val;
31
32 if (id < 8)
33 return -1;
34
35 val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
36 val |= BIT(id);
37 rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
38
39 return 0;
40}
41
42static int ralink_deassert_device(struct reset_controller_dev *rcdev,
43 unsigned long id)
44{
45 u32 val;
46
47 if (id < 8)
48 return -1;
49
50 val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
51 val &= ~BIT(id);
52 rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
53
54 return 0;
55}
56
57static int ralink_reset_device(struct reset_controller_dev *rcdev,
58 unsigned long id)
59{
60 ralink_assert_device(rcdev, id);
61 return ralink_deassert_device(rcdev, id);
62}
63
64static const struct reset_control_ops reset_ops = {
65 .reset = ralink_reset_device,
66 .assert = ralink_assert_device,
67 .deassert = ralink_deassert_device,
68};
69
70static struct reset_controller_dev reset_dev = {
71 .ops = &reset_ops,
72 .owner = THIS_MODULE,
73 .nr_resets = 32,
74 .of_reset_n_cells = 1,
75};
76
77void ralink_rst_init(void)
78{
79 reset_dev.of_node = of_find_compatible_node(NULL, NULL,
80 "ralink,rt2880-reset");
81 if (!reset_dev.of_node)
82 pr_err("Failed to find reset controller node");
83 else
84 reset_controller_register(&reset_dev);
85}
86
87static void ralink_restart(char *command)
88{
89 if (IS_ENABLED(CONFIG_PCI)) {
90 rt_sysc_m32(0, RSTCTL_RESET_PCI, SYSC_REG_RESET_CTRL);
91 mdelay(50);
92 }
93
94 local_irq_disable();
95 rt_sysc_w32(RSTCTL_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
96 unreachable();
97}
98
99static int __init mips_reboot_setup(void)
100{
101 _machine_restart = ralink_restart;
102
103 return 0;
104}
105
106arch_initcall(mips_reboot_setup);