arch/arm/mach-s3c2410/include/mach/system.h

   1 /* arch/arm/mach-s3c2410/include/mach/system.h
   2  *
   3  * Copyright (c) 2003 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * S3C2410 - System function defines and includes
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #include <linux/io.h>
  14 #include <mach/hardware.h>
  15
  16 #include <mach/map.h>
  17 #include <mach/idle.h>
  18 #include <mach/reset.h>
  19
  20 #include <mach/regs-clock.h>
  21
  22 void (*s3c24xx_idle)(void);
  23 void (*s3c24xx_reset_hook)(void);
  24
  25 void s3c24xx_default_idle(void)
  26 {
  27         unsigned long tmp;
  28         int i;
  29
  30         /* idle the system by using the idle mode which will wait for an
  31          * interrupt to happen before restarting the system.
  32          */
  33
  34         /* Warning: going into idle state upsets jtag scanning */
  35
  36         __raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
  37                      S3C2410_CLKCON);
  38
  39         /* the samsung port seems to do a loop and then unset idle.. */
  40         for (i = 0; i < 50; i++) {
  41                 tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
  42         }
  43
  44         /* this bit is not cleared on re-start... */
  45
  46         __raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
  47                      S3C2410_CLKCON);
  48 }
  49
  50 static void arch_idle(void)
  51 {
  52         if (s3c24xx_idle != NULL)
  53                 (s3c24xx_idle)();
  54         else
  55                 s3c24xx_default_idle();
  56 }
  57
  58 #include <mach/system-reset.h>