linux/arch/mips/ralink/reset.c
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:55 +02:00

105 lines
2.1 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
* Copyright (C) 2013 John Crispin <john@phrozen.org>
*/
#include <linux/pm.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/delay.h>
#include <linux/reset-controller.h>
#include <asm/reboot.h>
#include <asm/mach-ralink/ralink_regs.h>
/* Reset Control */
#define SYSC_REG_RESET_CTRL 0x034
#define RSTCTL_RESET_PCI BIT(26)
#define RSTCTL_RESET_SYSTEM BIT(0)
static int ralink_assert_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
u32 val;
if (id < 8)
return -1;
val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
val |= BIT(id);
rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
return 0;
}
static int ralink_deassert_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
u32 val;
if (id < 8)
return -1;
val = rt_sysc_r32(SYSC_REG_RESET_CTRL);
val &= ~BIT(id);
rt_sysc_w32(val, SYSC_REG_RESET_CTRL);
return 0;
}
static int ralink_reset_device(struct reset_controller_dev *rcdev,
unsigned long id)
{
ralink_assert_device(rcdev, id);
return ralink_deassert_device(rcdev, id);
}
static const struct reset_control_ops reset_ops = {
.reset = ralink_reset_device,
.assert = ralink_assert_device,
.deassert = ralink_deassert_device,
};
static struct reset_controller_dev reset_dev = {
.ops = &reset_ops,
.owner = THIS_MODULE,
.nr_resets = 32,
.of_reset_n_cells = 1,
};
void ralink_rst_init(void)
{
reset_dev.of_node = of_find_compatible_node(NULL, NULL,
"ralink,rt2880-reset");
if (!reset_dev.of_node)
pr_err("Failed to find reset controller node");
else
reset_controller_register(&reset_dev);
}
static void ralink_restart(char *command)
{
if (IS_ENABLED(CONFIG_PCI)) {
rt_sysc_m32(0, RSTCTL_RESET_PCI, SYSC_REG_RESET_CTRL);
mdelay(50);
}
local_irq_disable();
rt_sysc_w32(RSTCTL_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
unreachable();
}
static int __init mips_reboot_setup(void)
{
_machine_restart = ralink_restart;
return 0;
}
arch_initcall(mips_reboot_setup);