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1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright (C) 2013 Broadcom Corporation
3
4#include <linux/bitops.h>
5#include <linux/device.h>
6#include <linux/errno.h>
7#include <linux/init.h>
8#include <linux/io.h>
9#include <linux/jiffies.h>
10#include <linux/notifier.h>
11#include <linux/of_address.h>
12#include <linux/of_irq.h>
13#include <linux/of_platform.h>
14#include <linux/platform_device.h>
15#include <linux/printk.h>
16#include <linux/reboot.h>
17#include <linux/regmap.h>
18#include <linux/smp.h>
19#include <linux/mfd/syscon.h>
20
21#define RESET_SOURCE_ENABLE_REG 1
22#define SW_MASTER_RESET_REG 2
23
24static struct regmap *regmap;
25static u32 rst_src_en;
26static u32 sw_mstr_rst;
27
28struct reset_reg_mask {
29 u32 rst_src_en_mask;
30 u32 sw_mstr_rst_mask;
31};
32
33static const struct reset_reg_mask *reset_masks;
34
35static int brcmstb_restart_handler(struct notifier_block *this,
36 unsigned long mode, void *cmd)
37{
38 int rc;
39 u32 tmp;
40
41 rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask);
42 if (rc) {
43 pr_err("failed to write rst_src_en (%d)\n", rc);
44 return NOTIFY_DONE;
45 }
46
47 rc = regmap_read(regmap, rst_src_en, &tmp);
48 if (rc) {
49 pr_err("failed to read rst_src_en (%d)\n", rc);
50 return NOTIFY_DONE;
51 }
52
53 rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask);
54 if (rc) {
55 pr_err("failed to write sw_mstr_rst (%d)\n", rc);
56 return NOTIFY_DONE;
57 }
58
59 rc = regmap_read(regmap, sw_mstr_rst, &tmp);
60 if (rc) {
61 pr_err("failed to read sw_mstr_rst (%d)\n", rc);
62 return NOTIFY_DONE;
63 }
64
65 while (1)
66 ;
67
68 return NOTIFY_DONE;
69}
70
71static struct notifier_block brcmstb_restart_nb = {
72 .notifier_call = brcmstb_restart_handler,
73 .priority = 128,
74};
75
76static const struct reset_reg_mask reset_bits_40nm = {
77 .rst_src_en_mask = BIT(0),
78 .sw_mstr_rst_mask = BIT(0),
79};
80
81static const struct reset_reg_mask reset_bits_65nm = {
82 .rst_src_en_mask = BIT(3),
83 .sw_mstr_rst_mask = BIT(31),
84};
85
86static const struct of_device_id of_match[] = {
87 { .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm },
88 { .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm },
89 {},
90};
91
92static int brcmstb_reboot_probe(struct platform_device *pdev)
93{
94 int rc;
95 struct device_node *np = pdev->dev.of_node;
96 const struct of_device_id *of_id;
97
98 of_id = of_match_node(of_match, np);
99 if (!of_id) {
100 pr_err("failed to look up compatible string\n");
101 return -EINVAL;
102 }
103 reset_masks = of_id->data;
104
105 regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
106 if (IS_ERR(regmap)) {
107 pr_err("failed to get syscon phandle\n");
108 return -EINVAL;
109 }
110
111 rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
112 &rst_src_en);
113 if (rc) {
114 pr_err("can't get rst_src_en offset (%d)\n", rc);
115 return -EINVAL;
116 }
117
118 rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
119 &sw_mstr_rst);
120 if (rc) {
121 pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
122 return -EINVAL;
123 }
124
125 rc = register_restart_handler(&brcmstb_restart_nb);
126 if (rc)
127 dev_err(&pdev->dev,
128 "cannot register restart handler (err=%d)\n", rc);
129
130 return rc;
131}
132
133static struct platform_driver brcmstb_reboot_driver = {
134 .probe = brcmstb_reboot_probe,
135 .driver = {
136 .name = "brcmstb-reboot",
137 .of_match_table = of_match,
138 },
139};
140
141static int __init brcmstb_reboot_init(void)
142{
143 return platform_driver_probe(&brcmstb_reboot_driver,
144 brcmstb_reboot_probe);
145}
146subsys_initcall(brcmstb_reboot_init);
1/*
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/bitops.h>
15#include <linux/device.h>
16#include <linux/errno.h>
17#include <linux/init.h>
18#include <linux/io.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>
30
31#define RESET_SOURCE_ENABLE_REG 1
32#define SW_MASTER_RESET_REG 2
33
34static struct regmap *regmap;
35static u32 rst_src_en;
36static u32 sw_mstr_rst;
37
38struct reset_reg_mask {
39 u32 rst_src_en_mask;
40 u32 sw_mstr_rst_mask;
41};
42
43static const struct reset_reg_mask *reset_masks;
44
45static int brcmstb_restart_handler(struct notifier_block *this,
46 unsigned long mode, void *cmd)
47{
48 int rc;
49 u32 tmp;
50
51 rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask);
52 if (rc) {
53 pr_err("failed to write rst_src_en (%d)\n", rc);
54 return NOTIFY_DONE;
55 }
56
57 rc = regmap_read(regmap, rst_src_en, &tmp);
58 if (rc) {
59 pr_err("failed to read rst_src_en (%d)\n", rc);
60 return NOTIFY_DONE;
61 }
62
63 rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask);
64 if (rc) {
65 pr_err("failed to write sw_mstr_rst (%d)\n", rc);
66 return NOTIFY_DONE;
67 }
68
69 rc = regmap_read(regmap, sw_mstr_rst, &tmp);
70 if (rc) {
71 pr_err("failed to read sw_mstr_rst (%d)\n", rc);
72 return NOTIFY_DONE;
73 }
74
75 while (1)
76 ;
77
78 return NOTIFY_DONE;
79}
80
81static struct notifier_block brcmstb_restart_nb = {
82 .notifier_call = brcmstb_restart_handler,
83 .priority = 128,
84};
85
86static const struct reset_reg_mask reset_bits_40nm = {
87 .rst_src_en_mask = BIT(0),
88 .sw_mstr_rst_mask = BIT(0),
89};
90
91static const struct reset_reg_mask reset_bits_65nm = {
92 .rst_src_en_mask = BIT(3),
93 .sw_mstr_rst_mask = BIT(31),
94};
95
96static 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 },
99 {},
100};
101
102static int brcmstb_reboot_probe(struct platform_device *pdev)
103{
104 int rc;
105 struct device_node *np = pdev->dev.of_node;
106 const struct of_device_id *of_id;
107
108 of_id = of_match_node(of_match, np);
109 if (!of_id) {
110 pr_err("failed to look up compatible string\n");
111 return -EINVAL;
112 }
113 reset_masks = of_id->data;
114
115 regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
116 if (IS_ERR(regmap)) {
117 pr_err("failed to get syscon phandle\n");
118 return -EINVAL;
119 }
120
121 rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
122 &rst_src_en);
123 if (rc) {
124 pr_err("can't get rst_src_en offset (%d)\n", rc);
125 return -EINVAL;
126 }
127
128 rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
129 &sw_mstr_rst);
130 if (rc) {
131 pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
132 return -EINVAL;
133 }
134
135 rc = register_restart_handler(&brcmstb_restart_nb);
136 if (rc)
137 dev_err(&pdev->dev,
138 "cannot register restart handler (err=%d)\n", rc);
139
140 return rc;
141}
142
143static struct platform_driver brcmstb_reboot_driver = {
144 .probe = brcmstb_reboot_probe,
145 .driver = {
146 .name = "brcmstb-reboot",
147 .of_match_table = of_match,
148 },
149};
150
151static int __init brcmstb_reboot_init(void)
152{
153 return platform_driver_probe(&brcmstb_reboot_driver,
154 brcmstb_reboot_probe);
155}
156subsys_initcall(brcmstb_reboot_init);