arch/mips/sni/reset.c

   1 /*
   2  *  linux/arch/mips/sni/process.c
   3  *
   4  *  Reset a SNI machine.
   5  */
   6 #include <linux/delay.h>
   7
   8 #include <asm/io.h>
   9 #include <asm/reboot.h>
  10 #include <asm/sni.h>
  11
  12 /*
  13  * This routine reboots the machine by asking the keyboard
  14  * controller to pulse the reset-line low. We try that for a while,
  15  * and if it doesn't work, we do some other stupid things.
  16  */
  17 static inline void kb_wait(void)
  18 {
  19         int i;
  20
  21         for (i = 0; i < 0x10000; i++)
  22                 if ((inb_p(0x64) & 0x02) == 0)
  23                         break;
  24 }
  25
  26 /* XXX This ends up at the ARC firmware prompt ...  */
  27 void sni_machine_restart(char *command)
  28 {
  29         int i;
  30
  31         /* This does a normal via the keyboard controller like a PC.
  32            We can do that easier ...  */
  33         local_irq_disable();
  34         for (;;) {
  35                 for (i = 0; i < 100; i++) {
  36                         kb_wait();
  37                         udelay(50);
  38                         outb_p(0xfe, 0x64);      /* pulse reset low */
  39                         udelay(50);
  40                 }
  41         }
  42 }
  43
  44 void sni_machine_power_off(void)
  45 {
  46         *(volatile unsigned char *)PCIMT_CSWCSM = 0xfd;
  47 }