target/linux/xburst/files-2.6.32/arch/mips/jz4740/reset.c

   1 /*
   2  * linux/arch/mips/jz4740/reset.c
   3  *
   4  * JZ4740 reset routines.
   5  *
   6  * Copyright (c) 2006-2007  Ingenic Semiconductor Inc.
   7  * Author: <yliu@ingenic.cn>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <asm/io.h>
  16 #include <asm/pgtable.h>
  17 #include <asm/processor.h>
  18 #include <asm/reboot.h>
  19 #include <asm/system.h>
  20 #include <asm/mach-jz4740/regs.h>
  21 #include <asm/mach-jz4740/timer.h>
  22 #include <asm/mach-jz4740/jz4740.h>
  23
  24 void jz_restart(char *command)
  25 {
  26         printk(KERN_NOTICE "Restarting after 4 ms\n");
  27         REG_WDT_TCSR = WDT_TCSR_PRESCALE4 | WDT_TCSR_EXT_EN;
  28         REG_WDT_TCNT = 0;
  29         REG_WDT_TDR = JZ_EXTAL/1000;   /* reset after 4ms */
  30         jz4740_timer_enable_watchdog();
  31         REG_WDT_TCER = WDT_TCER_TCEN;  /* wdt start */
  32         while (1);
  33 }
  34
  35 void jz_halt(void)
  36 {
  37         /* Put CPU to power down mode */
  38         while (!(REG_RTC_RCR & RTC_RCR_WRDY));
  39         REG_RTC_HCR = RTC_HCR_PD;
  40
  41         while (1)
  42                 __asm__(".set\tmips3\n\t"
  43                         "wait\n\t"
  44                         ".set\tmips0");
  45 }
  46
  47 void jz_power_off(void)
  48 {
  49         jz_halt();
  50 }