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/*
* 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.
*
* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/pm.h>
#include <linux/module.h>
#include <asm/reboot.h>
#include <lantiq_soc.h>
#define ltq_rcu_w32(x, y) ltq_w32((x), ltq_rcu_membase + (y))
#define ltq_rcu_r32(x) ltq_r32(ltq_rcu_membase + (x))
/* register definitions */
#define LTQ_RCU_RST 0x0010
#define LTQ_RCU_RST_ALL 0x40000000
#define LTQ_RCU_RST_STAT 0x0014
#define LTQ_RCU_STAT_SHIFT 26
static struct resource ltq_rcu_resource = {
.name = "rcu",
.start = LTQ_RCU_BASE_ADDR,
.end = LTQ_RCU_BASE_ADDR + LTQ_RCU_SIZE - 1,
.flags = IORESOURCE_MEM,
};
/* remapped base addr of the reset control unit */
static void __iomem *ltq_rcu_membase;
/* This function is used by the watchdog driver */
int ltq_reset_cause(void)
{
u32 val = ltq_rcu_r32(LTQ_RCU_RST_STAT);
return val >> LTQ_RCU_STAT_SHIFT;
}
EXPORT_SYMBOL_GPL(ltq_reset_cause);
static void ltq_machine_restart(char *command)
{
pr_notice("System restart\n");
local_irq_disable();
ltq_rcu_w32(ltq_rcu_r32(LTQ_RCU_RST) | LTQ_RCU_RST_ALL, LTQ_RCU_RST);
unreachable();
}
static void ltq_machine_halt(void)
{
pr_notice("System halted.\n");
local_irq_disable();
unreachable();
}
static void ltq_machine_power_off(void)
{
pr_notice("Please turn off the power now.\n");
local_irq_disable();
unreachable();
}
static int __init mips_reboot_setup(void)
{
/* insert and request the memory region */
if (insert_resource(&iomem_resource, <q_rcu_resource) < 0)
panic("Failed to insert rcu memory\n");
if (request_mem_region(ltq_rcu_resource.start,
resource_size(<q_rcu_resource), "rcu") < 0)
panic("Failed to request rcu memory\n");
/* remap rcu register range */
ltq_rcu_membase = ioremap_nocache(ltq_rcu_resource.start,
resource_size(<q_rcu_resource));
if (!ltq_rcu_membase)
panic("Failed to remap rcu memory\n");
_machine_restart = ltq_machine_restart;
_machine_halt = ltq_machine_halt;
pm_power_off = ltq_machine_power_off;
return 0;
}
arch_initcall(mips_reboot_setup);
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