arch/mips/sni/reset.c

   1 /*
   2  *  linux/arch/mips/sni/process.c
   3  *
   4  *  Reset a SNI machine.
   5  */
   6 #include <asm/io.h>
   7 #include <asm/reboot.h>
   8 #include <asm/system.h>
   9 #include <asm/sni.h>
  10
  11 /*
  12  * This routine reboots the machine by asking the keyboard
  13  * controller to pulse the reset-line low. We try that for a while,
  14  * and if it doesn't work, we do some other stupid things.
  15  */
  16 static inline void kb_wait(void)
  17 {
  18         int i;
  19
  20         for (i = 0; i < 0x10000; i++)
  21                 if ((inb_p(0x64) & 0x02) == 0)
  22                         break;
  23 }
  24
  25 /* XXX This ends up at the ARC firmware prompt ...  */
  26 void sni_machine_restart(char *command)
  27 {
  28         int i, j;
  29
  30         /* This does a normal via the keyboard controller like a PC.
  31            We can do that easier ...  */
  32         local_irq_disable();
  33         for (;;) {
  34                 for (i = 0; i < 100; i++) {
  35                         kb_wait();
  36                         for (j = 0; j < 100000 ; j++)
  37                                 /* nothing */;
  38                         outb_p(0xfe, 0x64);      /* pulse reset low */
  39                 }
  40         }
  41 }
  42
  43 void sni_machine_power_off(void)
  44 {
  45         *(volatile unsigned char *)PCIMT_CSWCSM = 0xfd;
  46 }