arch/sparc/kernel/starfire.c

   1 /*
   2  * starfire.c: Starfire/E10000 support.
   3  *
   4  * Copyright (C) 1998 David S. Miller (davem@redhat.com)
   5  * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/slab.h>
  10
  11 #include <asm/page.h>
  12 #include <asm/oplib.h>
  13 #include <asm/smp.h>
  14 #include <asm/upa.h>
  15 #include <asm/starfire.h>
  16
  17 /*
  18  * A few places around the kernel check this to see if
  19  * they need to call us to do things in a Starfire specific
  20  * way.
  21  */
  22 int this_is_starfire = 0;
  23
  24 void check_if_starfire(void)
  25 {
  26         phandle ssnode = prom_finddevice("/ssp-serial");
  27         if (ssnode != 0 && (s32)ssnode != -1)
  28                 this_is_starfire = 1;
  29 }
  30
  31 /*
  32  * Each Starfire board has 32 registers which perform translation
  33  * and delivery of traditional interrupt packets into the extended
  34  * Starfire hardware format.  Essentially UPAID's now have 2 more
  35  * bits than in all previous Sun5 systems.
  36  */
  37 struct starfire_irqinfo {
  38         unsigned long imap_slots[32];
  39         unsigned long tregs[32];
  40         struct starfire_irqinfo *next;
  41         int upaid, hwmid;
  42 };
  43
  44 static struct starfire_irqinfo *sflist = NULL;
  45
  46 /* Beam me up Scott(McNeil)y... */
  47 void starfire_hookup(int upaid)
  48 {
  49         struct starfire_irqinfo *p;
  50         unsigned long treg_base, hwmid, i;
  51
  52         p = kmalloc(sizeof(*p), GFP_KERNEL);
  53         if (!p) {
  54                 prom_printf("starfire_hookup: No memory, this is insane.\n");
  55                 prom_halt();
  56         }
  57         treg_base = 0x100fc000000UL;
  58         hwmid = ((upaid & 0x3c) << 1) |
  59                 ((upaid & 0x40) >> 4) |
  60                 (upaid & 0x3);
  61         p->hwmid = hwmid;
  62         treg_base += (hwmid << 33UL);
  63         treg_base += 0x200UL;
  64         for (i = 0; i < 32; i++) {
  65                 p->imap_slots[i] = 0UL;
  66                 p->tregs[i] = treg_base + (i * 0x10UL);
  67                 /* Lets play it safe and not overwrite existing mappings */
  68                 if (upa_readl(p->tregs[i]) != 0)
  69                         p->imap_slots[i] = 0xdeadbeaf;
  70         }
  71         p->upaid = upaid;
  72         p->next = sflist;
  73         sflist = p;
  74 }
  75
  76 unsigned int starfire_translate(unsigned long imap,
  77                                 unsigned int upaid)
  78 {
  79         struct starfire_irqinfo *p;
  80         unsigned int bus_hwmid;
  81         unsigned int i;
  82
  83         bus_hwmid = (((unsigned long)imap) >> 33) & 0x7f;
  84         for (p = sflist; p != NULL; p = p->next)
  85                 if (p->hwmid == bus_hwmid)
  86                         break;
  87         if (p == NULL) {
  88                 prom_printf("XFIRE: Cannot find irqinfo for imap %016lx\n",
  89                             ((unsigned long)imap));
  90                 prom_halt();
  91         }
  92         for (i = 0; i < 32; i++) {
  93                 if (p->imap_slots[i] == imap ||
  94                     p->imap_slots[i] == 0UL)
  95                         break;
  96         }
  97         if (i == 32) {
  98                 printk("starfire_translate: Are you kidding me?\n");
  99                 panic("Lucy in the sky....");
 100         }
 101         p->imap_slots[i] = imap;
 102
 103         /* map to real upaid */
 104         upaid = (((upaid & 0x3c) << 1) |
 105                  ((upaid & 0x40) >> 4) |
 106                  (upaid & 0x3));
 107
 108         upa_writel(upaid, p->tregs[i]);
 109
 110         return i;
 111 }