mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 15:04:27 +08:00
2aec85b26f
Based on the normalized pattern:
this program is free software you can redistribute it and/or modify it
under the terms of the gnu general public license as published by the
free software foundation version 2 this program is distributed as is
without any warranty of any kind whether express or implied without
even the implied warranty of merchantability or fitness for a
particular purpose see the gnu general public license for more details
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-only
has been chosen to replace the boilerplate/reference.
Reviewed-by: Allison Randal <allison@lohutok.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
147 lines
3.3 KiB
C
147 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
// Copyright (C) 2013 Broadcom Corporation
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/device.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/printk.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/mfd/syscon.h>
|
|
|
|
#define RESET_SOURCE_ENABLE_REG 1
|
|
#define SW_MASTER_RESET_REG 2
|
|
|
|
static struct regmap *regmap;
|
|
static u32 rst_src_en;
|
|
static u32 sw_mstr_rst;
|
|
|
|
struct reset_reg_mask {
|
|
u32 rst_src_en_mask;
|
|
u32 sw_mstr_rst_mask;
|
|
};
|
|
|
|
static const struct reset_reg_mask *reset_masks;
|
|
|
|
static int brcmstb_restart_handler(struct notifier_block *this,
|
|
unsigned long mode, void *cmd)
|
|
{
|
|
int rc;
|
|
u32 tmp;
|
|
|
|
rc = regmap_write(regmap, rst_src_en, reset_masks->rst_src_en_mask);
|
|
if (rc) {
|
|
pr_err("failed to write rst_src_en (%d)\n", rc);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
rc = regmap_read(regmap, rst_src_en, &tmp);
|
|
if (rc) {
|
|
pr_err("failed to read rst_src_en (%d)\n", rc);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
rc = regmap_write(regmap, sw_mstr_rst, reset_masks->sw_mstr_rst_mask);
|
|
if (rc) {
|
|
pr_err("failed to write sw_mstr_rst (%d)\n", rc);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
rc = regmap_read(regmap, sw_mstr_rst, &tmp);
|
|
if (rc) {
|
|
pr_err("failed to read sw_mstr_rst (%d)\n", rc);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
while (1)
|
|
;
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block brcmstb_restart_nb = {
|
|
.notifier_call = brcmstb_restart_handler,
|
|
.priority = 128,
|
|
};
|
|
|
|
static const struct reset_reg_mask reset_bits_40nm = {
|
|
.rst_src_en_mask = BIT(0),
|
|
.sw_mstr_rst_mask = BIT(0),
|
|
};
|
|
|
|
static const struct reset_reg_mask reset_bits_65nm = {
|
|
.rst_src_en_mask = BIT(3),
|
|
.sw_mstr_rst_mask = BIT(31),
|
|
};
|
|
|
|
static const struct of_device_id of_match[] = {
|
|
{ .compatible = "brcm,brcmstb-reboot", .data = &reset_bits_40nm },
|
|
{ .compatible = "brcm,bcm7038-reboot", .data = &reset_bits_65nm },
|
|
{},
|
|
};
|
|
|
|
static int brcmstb_reboot_probe(struct platform_device *pdev)
|
|
{
|
|
int rc;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
const struct of_device_id *of_id;
|
|
|
|
of_id = of_match_node(of_match, np);
|
|
if (!of_id) {
|
|
pr_err("failed to look up compatible string\n");
|
|
return -EINVAL;
|
|
}
|
|
reset_masks = of_id->data;
|
|
|
|
regmap = syscon_regmap_lookup_by_phandle(np, "syscon");
|
|
if (IS_ERR(regmap)) {
|
|
pr_err("failed to get syscon phandle\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = of_property_read_u32_index(np, "syscon", RESET_SOURCE_ENABLE_REG,
|
|
&rst_src_en);
|
|
if (rc) {
|
|
pr_err("can't get rst_src_en offset (%d)\n", rc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = of_property_read_u32_index(np, "syscon", SW_MASTER_RESET_REG,
|
|
&sw_mstr_rst);
|
|
if (rc) {
|
|
pr_err("can't get sw_mstr_rst offset (%d)\n", rc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = register_restart_handler(&brcmstb_restart_nb);
|
|
if (rc)
|
|
dev_err(&pdev->dev,
|
|
"cannot register restart handler (err=%d)\n", rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static struct platform_driver brcmstb_reboot_driver = {
|
|
.probe = brcmstb_reboot_probe,
|
|
.driver = {
|
|
.name = "brcmstb-reboot",
|
|
.of_match_table = of_match,
|
|
},
|
|
};
|
|
|
|
static int __init brcmstb_reboot_init(void)
|
|
{
|
|
return platform_driver_probe(&brcmstb_reboot_driver,
|
|
brcmstb_reboot_probe);
|
|
}
|
|
subsys_initcall(brcmstb_reboot_init);
|