blob: 1ad56298c6c7527c11db3e3a3f907d19845ba0c2 [file] [log] [blame]
Marc Carino030494e2014-07-22 16:48:03 -07001/*
2 * Copyright (C) 2013 Broadcom Corporation
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation version 2.
7 *
8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
9 * kind, whether express or implied; without even the implied warranty
10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14#include <linux/device.h>
15#include <linux/errno.h>
16#include <linux/init.h>
17#include <linux/io.h>
18#include <linux/jiffies.h>
Guenter Roeck6136c412014-09-30 10:48:36 -070019#include <linux/notifier.h>
Marc Carino030494e2014-07-22 16:48:03 -070020#include <linux/of_address.h>
21#include <linux/of_irq.h>
22#include <linux/of_platform.h>
23#include <linux/platform_device.h>
24#include <linux/printk.h>
25#include <linux/reboot.h>
26#include <linux/regmap.h>
27#include <linux/smp.h>
28#include <linux/mfd/syscon.h>
29
Marc Carino030494e2014-07-22 16:48:03 -070030#define RESET_SOURCE_ENABLE_REG 1
31#define SW_MASTER_RESET_REG 2
32
33static struct regmap *regmap;
34static u32 rst_src_en;
35static u32 sw_mstr_rst;
36
Guenter Roeck6136c412014-09-30 10:48:36 -070037static int brcmstb_restart_handler(struct notifier_block *this,
38 unsigned long mode, void *cmd)
Marc Carino030494e2014-07-22 16:48:03 -070039{
40 int rc;
41 u32 tmp;
42
43 rc = regmap_write(regmap, rst_src_en, 1);
44 if (rc) {
45 pr_err("failed to write rst_src_en (%d)\n", rc);
Guenter Roeck6136c412014-09-30 10:48:36 -070046 return NOTIFY_DONE;
Marc Carino030494e2014-07-22 16:48:03 -070047 }
48
49 rc = regmap_read(regmap, rst_src_en, &tmp);
50 if (rc) {
51 pr_err("failed to read rst_src_en (%d)\n", rc);
Guenter Roeck6136c412014-09-30 10:48:36 -070052 return NOTIFY_DONE;
Marc Carino030494e2014-07-22 16:48:03 -070053 }
54
55 rc = regmap_write(regmap, sw_mstr_rst, 1);
56 if (rc) {
57 pr_err("failed to write sw_mstr_rst (%d)\n", rc);
Guenter Roeck6136c412014-09-30 10:48:36 -070058 return NOTIFY_DONE;
Marc Carino030494e2014-07-22 16:48:03 -070059 }
60
61 rc = regmap_read(regmap, sw_mstr_rst, &tmp);
62 if (rc) {
63 pr_err("failed to read sw_mstr_rst (%d)\n", rc);
Guenter Roeck6136c412014-09-30 10:48:36 -070064 return NOTIFY_DONE;
Marc Carino030494e2014-07-22 16:48:03 -070065 }
66
67 while (1)
68 ;
Guenter Roeck6136c412014-09-30 10:48:36 -070069
70 return NOTIFY_DONE;
Marc Carino030494e2014-07-22 16:48:03 -070071}
72
Guenter Roeck6136c412014-09-30 10:48:36 -070073static struct notifier_block brcmstb_restart_nb = {
74 .notifier_call = brcmstb_restart_handler,
75 .priority = 128,
76};
77
Marc Carino030494e2014-07-22 16:48:03 -070078static int brcmstb_reboot_probe(struct platform_device *pdev)
79{
80 int rc;
81 struct device_node *np = pdev->dev.of_node;
82
83 regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
84 if (IS_ERR(regmap)) {
85 pr_err("failed to get syscon phandle\n");
86 return -EINVAL;
87 }
88
89 rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
90 &rst_src_en);
91 if (rc) {
92 pr_err("can't get rst_src_en offset (%d)\n", rc);
93 return -EINVAL;
94 }
95
96 rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
97 &sw_mstr_rst);
98 if (rc) {
99 pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
100 return -EINVAL;
101 }
102
Guenter Roeck6136c412014-09-30 10:48:36 -0700103 rc = register_restart_handler(&brcmstb_restart_nb);
104 if (rc)
105 dev_err(&pdev->dev,
106 "cannot register restart handler (err=%d)\n", rc);
Marc Carino030494e2014-07-22 16:48:03 -0700107
Guenter Roeck6136c412014-09-30 10:48:36 -0700108 return rc;
Marc Carino030494e2014-07-22 16:48:03 -0700109}
110
111static const struct of_device_id of_match[] = {
112 { .compatible = "brcm,brcmstb-reboot", },
113 {},
114};
115
116static struct platform_driver brcmstb_reboot_driver = {
117 .probe = brcmstb_reboot_probe,
118 .driver = {
119 .name = "brcmstb-reboot",
120 .owner = THIS_MODULE,
121 .of_match_table = of_match,
122 },
123};
124
125static int __init brcmstb_reboot_init(void)
126{
127 return platform_driver_probe(&brcmstb_reboot_driver,
128 brcmstb_reboot_probe);
129}
130subsys_initcall(brcmstb_reboot_init);