mirror of https://gitee.com/openkylin/linux.git
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/pm.h>
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#include <linux/export.h>
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#include <asm/reboot.h>
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#include <lantiq_soc.h>
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#define ltq_rcu_w32(x, y) ltq_w32((x), ltq_rcu_membase + (y))
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#define ltq_rcu_r32(x) ltq_r32(ltq_rcu_membase + (x))
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/* register definitions */
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#define LTQ_RCU_RST 0x0010
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#define LTQ_RCU_RST_ALL 0x40000000
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#define LTQ_RCU_RST_STAT 0x0014
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#define LTQ_RCU_STAT_SHIFT 26
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static struct resource ltq_rcu_resource = {
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.name = "rcu",
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.start = LTQ_RCU_BASE_ADDR,
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.end = LTQ_RCU_BASE_ADDR + LTQ_RCU_SIZE - 1,
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.flags = IORESOURCE_MEM,
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};
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/* remapped base addr of the reset control unit */
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static void __iomem *ltq_rcu_membase;
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/* This function is used by the watchdog driver */
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int ltq_reset_cause(void)
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{
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u32 val = ltq_rcu_r32(LTQ_RCU_RST_STAT);
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return val >> LTQ_RCU_STAT_SHIFT;
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}
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EXPORT_SYMBOL_GPL(ltq_reset_cause);
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static void ltq_machine_restart(char *command)
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{
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pr_notice("System restart\n");
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local_irq_disable();
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ltq_rcu_w32(ltq_rcu_r32(LTQ_RCU_RST) | LTQ_RCU_RST_ALL, LTQ_RCU_RST);
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unreachable();
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}
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static void ltq_machine_halt(void)
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{
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pr_notice("System halted.\n");
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local_irq_disable();
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unreachable();
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}
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static void ltq_machine_power_off(void)
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{
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pr_notice("Please turn off the power now.\n");
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local_irq_disable();
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unreachable();
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}
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static int __init mips_reboot_setup(void)
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{
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/* insert and request the memory region */
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if (insert_resource(&iomem_resource, <q_rcu_resource) < 0)
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panic("Failed to insert rcu memory\n");
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if (request_mem_region(ltq_rcu_resource.start,
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resource_size(<q_rcu_resource), "rcu") < 0)
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panic("Failed to request rcu memory\n");
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/* remap rcu register range */
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ltq_rcu_membase = ioremap_nocache(ltq_rcu_resource.start,
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resource_size(<q_rcu_resource));
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if (!ltq_rcu_membase)
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panic("Failed to remap rcu memory\n");
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_machine_restart = ltq_machine_restart;
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_machine_halt = ltq_machine_halt;
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pm_power_off = ltq_machine_power_off;
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return 0;
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}
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arch_initcall(mips_reboot_setup);
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