release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-footbridge/include/mach/system.h

   1 /*
   2  *  arch/arm/mach-footbridge/include/mach/system.h
   3  *
   4  *  Copyright (C) 1996-1999 Russell King.
   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 version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/io.h>
  11 #include <asm/hardware/dec21285.h>
  12 #include <mach/hardware.h>
  13 #include <asm/leds.h>
  14 #include <asm/mach-types.h>
  15
  16 static inline void arch_idle(void)
  17 {
  18         cpu_do_idle();
  19 }
  20
  21 static inline void arch_reset(char mode, const char *cmd)
  22 {
  23         if (mode == 's') {
  24                 /*
  25                  * Jump into the ROM
  26                  */
  27                 cpu_reset(0x41000000);
  28         } else {
  29                 if (machine_is_netwinder()) {
  30                         /* open up the SuperIO chip
  31                          */
  32                         outb(0x87, 0x370);
  33                         outb(0x87, 0x370);
  34
  35                         /* aux function group 1 (logical device 7)
  36                          */
  37                         outb(0x07, 0x370);
  38                         outb(0x07, 0x371);
  39
  40                         /* set GP16 for WD-TIMER output
  41                          */
  42                         outb(0xe6, 0x370);
  43                         outb(0x00, 0x371);
  44
  45                         /* set a RED LED and toggle WD_TIMER for rebooting
  46                          */
  47                         outb(0xc4, 0x338);
  48                 } else {
  49                         /*
  50                          * Force the watchdog to do a CPU reset.
  51                          *
  52                          * After making sure that the watchdog is disabled
  53                          * (so we can change the timer registers) we first
  54                          * enable the timer to autoreload itself.  Next, the
  55                          * timer interval is set really short and any
  56                          * current interrupt request is cleared (so we can
  57                          * see an edge transition).  Finally, TIMER4 is
  58                          * enabled as the watchdog.
  59                          */
  60                         *CSR_SA110_CNTL &= ~(1 << 13);
  61                         *CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE |
  62                                            TIMER_CNTL_AUTORELOAD |
  63                                            TIMER_CNTL_DIV16;
  64                         *CSR_TIMER4_LOAD = 0x2;
  65                         *CSR_TIMER4_CLR  = 0;
  66                         *CSR_SA110_CNTL |= (1 << 13);
  67                 }
  68         }
  69 }