arch/arm/mach-at91/include/mach/system.h

   1 /*
   2  * arch/arm/mach-at91/include/mach/system.h
   3  *
   4  *  Copyright (C) 2003 SAN People
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifndef __ASM_ARCH_SYSTEM_H
  22 #define __ASM_ARCH_SYSTEM_H
  23
  24 #include <mach/hardware.h>
  25 #include <mach/at91_st.h>
  26 #include <mach/at91_dbgu.h>
  27 #include <mach/at91_pmc.h>
  28
  29 static inline void arch_idle(void)
  30 {
  31         /*
  32          * Disable the processor clock.  The processor will be automatically
  33          * re-enabled by an interrupt or by a reset.
  34          */
  35 #ifdef AT91_PS
  36         at91_sys_write(AT91_PS_CR, AT91_PS_CR_CPU);
  37 #else
  38         at91_sys_write(AT91_PMC_SCDR, AT91_PMC_PCK);
  39 #endif
  40 #ifndef CONFIG_CPU_ARM920T
  41         /*
  42          * Set the processor (CP15) into 'Wait for Interrupt' mode.
  43          * Post-RM9200 processors need this in conjunction with the above
  44          * to save power when idle.
  45          */
  46         cpu_do_idle();
  47 #endif
  48 }
  49
  50 #endif