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