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auxio.c

/* auxio.c: Probing for the Sparc AUXIO register at boot time.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 */

#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/oplib.h>
#include <asm/io.h>
#include <asm/auxio.h>
#include <asm/string.h>       /* memset(), Linux has no bzero() */

/* Probe and map in the Auxiliary I/O register */

/* auxio_register is not static because it is referenced 
 * in entry.S::floppy_tdone
 */
void __iomem *auxio_register = NULL;
static DEFINE_SPINLOCK(auxio_lock);

void __init auxio_probe(void)
{
      int node, auxio_nd;
      struct linux_prom_registers auxregs[1];
      struct resource r;

      switch (sparc_cpu_model) {
      case sun4d:
      case sun4:
            return;
      default:
            break;
      }
      node = prom_getchild(prom_root_node);
      auxio_nd = prom_searchsiblings(node, "auxiliary-io");
      if(!auxio_nd) {
            node = prom_searchsiblings(node, "obio");
            node = prom_getchild(node);
            auxio_nd = prom_searchsiblings(node, "auxio");
            if(!auxio_nd) {
#ifdef CONFIG_PCI
                  /* There may be auxio on Ebus */
                  return;
#else
                  if(prom_searchsiblings(node, "leds")) {
                        /* VME chassis sun4m machine, no auxio exists. */
                        return;
                  }
                  prom_printf("Cannot find auxio node, cannot continue...\n");
                  prom_halt();
#endif
            }
      }
      if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
            return;
      prom_apply_obio_ranges(auxregs, 0x1);
      /* Map the register both read and write */
      r.flags = auxregs[0].which_io & 0xF;
      r.start = auxregs[0].phys_addr;
      r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
      auxio_register = sbus_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
      /* Fix the address on sun4m and sun4c. */
      if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
         sparc_cpu_model == sun4c)
            auxio_register += (3 - ((unsigned long)auxio_register & 3));

      set_auxio(AUXIO_LED, 0);
}

unsigned char get_auxio(void)
{
      if(auxio_register) 
            return sbus_readb(auxio_register);
      return 0;
}

void set_auxio(unsigned char bits_on, unsigned char bits_off)
{
      unsigned char regval;
      unsigned long flags;
      spin_lock_irqsave(&auxio_lock, flags);
      switch(sparc_cpu_model) {
      case sun4c:
            regval = sbus_readb(auxio_register);
            sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
                  auxio_register);
            break;
      case sun4m:
            if(!auxio_register)
                  break;     /* VME chassis sun4m, no auxio. */
            regval = sbus_readb(auxio_register);
            sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
                  auxio_register);
            break;
      case sun4d:
            break;
      default:
            panic("Can't set AUXIO register on this machine.");
      };
      spin_unlock_irqrestore(&auxio_lock, flags);
}


/* sun4m power control register (AUXIO2) */

volatile unsigned char * auxio_power_register = NULL;

void __init auxio_power_probe(void)
{
      struct linux_prom_registers regs;
      int node;
      struct resource r;

      /* Attempt to find the sun4m power control node. */
      node = prom_getchild(prom_root_node);
      node = prom_searchsiblings(node, "obio");
      node = prom_getchild(node);
      node = prom_searchsiblings(node, "power");
      if (node == 0 || node == -1)
            return;

      /* Map the power control register. */
      if (prom_getproperty(node, "reg", (char *)&regs, sizeof(regs)) <= 0)
            return;
      prom_apply_obio_ranges(&regs, 1);
      memset(&r, 0, sizeof(r));
      r.flags = regs.which_io & 0xF;
      r.start = regs.phys_addr;
      r.end = regs.phys_addr + regs.reg_size - 1;
      auxio_power_register = (unsigned char *) sbus_ioremap(&r, 0,
          regs.reg_size, "auxpower");

      /* Display a quick message on the console. */
      if (auxio_power_register)
            printk(KERN_INFO "Power off control detected.\n");
}

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