2 * Copyright (C) 2013 Broadcom Corporation
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.
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.
14 #include <linux/bitops.h>
15 #include <linux/device.h>
16 #include <linux/errno.h>
17 #include <linux/init.h>
19 #include <linux/jiffies.h>
20 #include <linux/notifier.h>
21 #include <linux/of_address.h>
22 #include <linux/of_irq.h>
23 #include <linux/of_platform.h>
24 #include <linux/platform_device.h>
25 #include <linux/printk.h>
26 #include <linux/reboot.h>
27 #include <linux/regmap.h>
28 #include <linux/smp.h>
29 #include <linux/mfd/syscon.h>
31 #define RESET_SOURCE_ENABLE_REG 1
32 #define SW_MASTER_RESET_REG 2
34 static struct regmap *regmap;
35 static u32 rst_src_en;
36 static u32 sw_mstr_rst;
38 struct reset_reg_mask {
43 static const struct reset_reg_mask *reset_masks;
45 static int brcmstb_restart_handler(struct notifier_block *this,
46 unsigned long mode, void *cmd)
51 rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask);
53 pr_err("failed to write rst_src_en (%d)\n", rc);
57 rc = regmap_read(regmap, rst_src_en, &tmp);
59 pr_err("failed to read rst_src_en (%d)\n", rc);
63 rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask);
65 pr_err("failed to write sw_mstr_rst (%d)\n", rc);
69 rc = regmap_read(regmap, sw_mstr_rst, &tmp);
71 pr_err("failed to read sw_mstr_rst (%d)\n", rc);
81 static struct notifier_block brcmstb_restart_nb = {
82 .notifier_call = brcmstb_restart_handler,
86 static const struct reset_reg_mask reset_bits_40nm = {
87 .rst_src_en_mask = BIT(0),
88 .sw_mstr_rst_mask = BIT(0),
91 static const struct reset_reg_mask reset_bits_65nm = {
92 .rst_src_en_mask = BIT(3),
93 .sw_mstr_rst_mask = BIT(31),
96 static const struct of_device_id of_match[] = {
97 { .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm },
98 { .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm },
102 static int brcmstb_reboot_probe(struct platform_device *pdev)
105 struct device_node *np = pdev->dev.of_node;
106 const struct of_device_id *of_id;
108 of_id = of_match_node(of_match, np);
110 pr_err("failed to look up compatible string\n");
113 reset_masks = of_id->data;
115 regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
116 if (IS_ERR(regmap)) {
117 pr_err("failed to get syscon phandle\n");
121 rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
124 pr_err("can't get rst_src_en offset (%d)\n", rc);
128 rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
131 pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
135 rc = register_restart_handler(&brcmstb_restart_nb);
138 "cannot register restart handler (err=%d)\n", rc);
143 static struct platform_driver brcmstb_reboot_driver = {
144 .probe = brcmstb_reboot_probe,
146 .name = "brcmstb-reboot",
147 .of_match_table = of_match,
151 static int __init brcmstb_reboot_init(void)
153 return platform_driver_probe(&brcmstb_reboot_driver,
154 brcmstb_reboot_probe);
156 subsys_initcall(brcmstb_reboot_init);