113 строки
2.7 KiB
C
113 строки
2.7 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 <linux/delay.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <asm/reboot.h>
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#include <lantiq_soc.h>
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#include "../prom.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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/* reset request register */
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#define RCU_RST_REQ 0x0010
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/* reset status register */
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#define RCU_RST_STAT 0x0014
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/* reboot bit */
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#define RCU_RD_SRST BIT(30)
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/* reset cause */
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#define RCU_STAT_SHIFT 26
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/* boot selection */
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#define RCU_BOOT_SEL_SHIFT 26
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#define RCU_BOOT_SEL_MASK 0x7
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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(RCU_RST_STAT);
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return val >> RCU_STAT_SHIFT;
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}
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EXPORT_SYMBOL_GPL(ltq_reset_cause);
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/* allow platform code to find out what source we booted from */
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unsigned char ltq_boot_select(void)
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{
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u32 val = ltq_rcu_r32(RCU_RST_STAT);
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return (val >> RCU_BOOT_SEL_SHIFT) & RCU_BOOT_SEL_MASK;
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}
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/* reset a io domain for u micro seconds */
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void ltq_reset_once(unsigned int module, ulong u)
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{
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ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) | module, RCU_RST_REQ);
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udelay(u);
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ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) & ~module, RCU_RST_REQ);
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}
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static void ltq_machine_restart(char *command)
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{
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local_irq_disable();
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ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) | RCU_RD_SRST, RCU_RST_REQ);
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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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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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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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struct resource res;
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struct device_node *np =
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of_find_compatible_node(NULL, NULL, "lantiq,rcu-xway");
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/* check if all the reset register range is available */
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if (!np)
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panic("Failed to load reset resources from devicetree");
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if (of_address_to_resource(np, 0, &res))
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panic("Failed to get rcu memory range");
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if (request_mem_region(res.start, resource_size(&res), res.name) < 0)
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pr_err("Failed to request rcu memory");
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ltq_rcu_membase = ioremap_nocache(res.start, resource_size(&res));
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if (!ltq_rcu_membase)
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panic("Failed to remap core memory");
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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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