tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
21static struct regmap *regmap;
22static u32 rst_src_en;
23static u32 sw_mstr_rst;
24
25struct reset_reg_mask {
26 u32 rst_src_en_mask;
27 u32 sw_mstr_rst_mask;
28};
29
30static const struct reset_reg_mask *reset_masks;
31
32static int brcmstb_restart_handler(struct sys_off_data *data)
33{
34 int rc;
35 u32 tmp;
36
37 rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask);
38 if (rc) {
39 pr_err("failed to write rst_src_en (%d)\n", rc);
40 return NOTIFY_DONE;
41 }
42
43 rc = regmap_read(regmap, rst_src_en, &tmp);
44 if (rc) {
45 pr_err("failed to read rst_src_en (%d)\n", rc);
46 return NOTIFY_DONE;
47 }
48
49 rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask);
50 if (rc) {
51 pr_err("failed to write sw_mstr_rst (%d)\n", rc);
52 return NOTIFY_DONE;
53 }
54
55 rc = regmap_read(regmap, sw_mstr_rst, &tmp);
56 if (rc) {
57 pr_err("failed to read sw_mstr_rst (%d)\n", rc);
58 return NOTIFY_DONE;
59 }
60
61 return NOTIFY_DONE;
62}
63
64static const struct reset_reg_mask reset_bits_40nm = {
65 .rst_src_en_mask = BIT(0),
66 .sw_mstr_rst_mask = BIT(0),
67};
68
69static const struct reset_reg_mask reset_bits_65nm = {
70 .rst_src_en_mask = BIT(3),
71 .sw_mstr_rst_mask = BIT(31),
72};
73
74static int brcmstb_reboot_probe(struct platform_device *pdev)
75{
76 int rc;
77 struct device_node *np = pdev->dev.of_node;
78 unsigned int args[2];
79
80 reset_masks = device_get_match_data(&pdev->dev);
81 if (!reset_masks) {
82 pr_err("failed to get match data\n");
83 return -EINVAL;
84 }
85
86 regmap = syscon_regmap_lookup_by_phandle_args(np, "syscon", ARRAY_SIZE(args), args);
87 if (IS_ERR(regmap)) {
88 pr_err("failed to get syscon phandle\n");
89 return -EINVAL;
90 }
91 rst_src_en = args[0];
92 sw_mstr_rst = args[1];
93
94 rc = devm_register_sys_off_handler(&pdev->dev, SYS_OFF_MODE_RESTART,
95 128, brcmstb_restart_handler, NULL);
96 if (rc)
97 dev_err(&pdev->dev,
98 "cannot register restart handler (err=%d)\n", rc);
99
100 return rc;
101}
102
103static const struct of_device_id of_match[] = {
104 { .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm },
105 { .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm },
106 {},
107};
108
109static struct platform_driver brcmstb_reboot_driver = {
110 .probe = brcmstb_reboot_probe,
111 .driver = {
112 .name = "brcmstb-reboot",
113 .of_match_table = of_match,
114 },
115};
116
117static int __init brcmstb_reboot_init(void)
118{
119 return platform_driver_register(&brcmstb_reboot_driver);
120}
121subsys_initcall(brcmstb_reboot_init);