text: /*
   * starfire.c: Starfire/E10000 support.
   *
   * Copyright (C) 1998 David S. Miller (davem@redhat.com)
   * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
   */
  
  #include <linux/kernel.h>
  #include <linux/slab.h>
  
  #include <asm/page.h>
  #include <asm/oplib.h>
  #include <asm/smp.h>
  #include <asm/upa.h>
  #include <asm/starfire.h>
  
  /*
   * A few places around the kernel check this to see if
   * they need to call us to do things in a Starfire specific
   * way.
   */
  int this_is_starfire = 0;
  
  void check_if_starfire(void)
  {
  	int ssnode = prom_finddevice("/ssp-serial");
  	if (ssnode != 0 && ssnode != -1)
  		this_is_starfire = 1;
  }
  
  int starfire_hard_smp_processor_id(void)
  {
  	return upa_readl(0x1fff40000d0UL);
  }
  
  /*
   * Each Starfire board has 32 registers which perform translation
   * and delivery of traditional interrupt packets into the extended
   * Starfire hardware format.  Essentially UPAID's now have 2 more
   * bits than in all previous Sun5 systems.
   */
  struct starfire_irqinfo {
  	unsigned long imap_slots[32];
  	unsigned long tregs[32];
  	struct starfire_irqinfo *next;
  	int upaid, hwmid;
  };
  
  static struct starfire_irqinfo *sflist = NULL;
  
  /* Beam me up Scott(McNeil)y... */
  void starfire_hookup(int upaid)
  {
  	struct starfire_irqinfo *p;
  	unsigned long treg_base, hwmid, i;
  
  	p = kmalloc(sizeof(*p), GFP_KERNEL);
  	if (!p) {
  		prom_printf("starfire_hookup: No memory, this is insane.\n");
  		prom_halt();
  	}
  	treg_base = 0x100fc000000UL;
  	hwmid = ((upaid & 0x3c) << 1) |
  		((upaid & 0x40) >> 4) |
  		(upaid & 0x3);
  	p->hwmid = hwmid;
  	treg_base += (hwmid << 33UL);
  	treg_base += 0x200UL;
  	for (i = 0; i < 32; i++) {
  		p->imap_slots[i] = 0UL;
  		p->tregs[i] = treg_base + (i * 0x10UL);
  		/* Lets play it safe and not overwrite existing mappings */
  		if (upa_readl(p->tregs[i]) != 0)
  			p->imap_slots[i] = 0xdeadbeaf;
  	}
  	p->upaid = upaid;
  	p->next = sflist;
  	sflist = p;
  }
  
  unsigned int starfire_translate(unsigned long imap,
  				unsigned int upaid)
  {
  	struct starfire_irqinfo *p;
  	unsigned int bus_hwmid;
  	unsigned int i;
  
  	bus_hwmid = (((unsigned long)imap) >> 33) & 0x7f;
  	for (p = sflist; p != NULL; p = p->next)
  		if (p->hwmid == bus_hwmid)
  			break;
  	if (p == NULL) {
  		prom_printf("XFIRE: Cannot find irqinfo for imap %016lx\n",
  			    ((unsigned long)imap));
  		prom_halt();
  	}
  	for (i = 0; i < 32; i++) {
  		if (p->imap_slots[i] == imap ||
  		    p->imap_slots[i] == 0UL)
  			break;
  	}
  	if (i == 32) {
  		printk("starfire_translate: Are you kidding me?\n");
  		panic("Lucy in the sky....");
  	}
  	p->imap_slots[i] = imap;
  
  	/* map to real upaid */
  	upaid = (((upaid & 0x3c) << 1) |
  		 ((upaid & 0x40) >> 4) |
  		 (upaid & 0x3));
  
  	upa_writel(upaid, p->tregs[i]);
  
  	return i;
  }
  