LXR linux/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 */
  22int this_is_starfire = 0;
  23
  24void check_if_starfire(void)
  25{
  26        int ssnode = prom_finddevice("/ssp-serial");
  27        if (ssnode != 0 && ssnode != -1)
  28                this_is_starfire = 1;
  29}
  30
  31int starfire_hard_smp_processor_id(void)
  32{
  33        return upa_readl(0x1fff40000d0UL);
  34}
  35
  36/*
  37 * Each Starfire board has 32 registers which perform translation
  38 * and delivery of traditional interrupt packets into the extended
  39 * Starfire hardware format.  Essentially UPAID's now have 2 more
  40 * bits than in all previous Sun5 systems.
  41 */
  42struct starfire_irqinfo {
  43        unsigned long imap_slots[32];
  44        unsigned long tregs[32];
  45        struct starfire_irqinfo *next;
  46        int upaid, hwmid;
  47};
  48
  49static struct starfire_irqinfo *sflist = NULL;
  50
  51/* Beam me up Scott(McNeil)y... */
  52void starfire_hookup(int upaid)
  53{
  54        struct starfire_irqinfo *p;
  55        unsigned long treg_base, hwmid, i;
  56
  57        p = kmalloc(sizeof(*p), GFP_KERNEL);
  58        if (!p) {
  59                prom_printf("starfire_hookup: No memory, this is insane.\n");
  60                prom_halt();
  61        }
  62        treg_base = 0x100fc000000UL;
  63        hwmid = ((upaid & 0x3c) << 1) |
  64                ((upaid & 0x40) >> 4) |
  65                (upaid & 0x3);
  66        p->hwmid = hwmid;
  67        treg_base += (hwmid << 33UL);
  68        treg_base += 0x200UL;
  69        for (i = 0; i < 32; i++) {
  70                p->imap_slots[i] = 0UL;
  71                p->tregs[i] = treg_base + (i * 0x10UL);
  72                /* Lets play it safe and not overwrite existing mappings */
  73                if (upa_readl(p->tregs[i]) != 0)
  74                        p->imap_slots[i] = 0xdeadbeaf;
  75        }
  76        p->upaid = upaid;
  77        p->next = sflist;
  78        sflist = p;
  79}
  80
  81unsigned int starfire_translate(unsigned long imap,
  82                                unsigned int upaid)
  83{
  84        struct starfire_irqinfo *p;
  85        unsigned int bus_hwmid;
  86        unsigned int i;
  87
  88        bus_hwmid = (((unsigned long)imap) >> 33) & 0x7f;
  89        for (p = sflist; p != NULL; p = p->next)
  90                if (p->hwmid == bus_hwmid)
  91                        break;
  92        if (p == NULL) {
  93                prom_printf("XFIRE: Cannot find irqinfo for imap %016lx\n",
  94                            ((unsigned long)imap));
  95                prom_halt();
  96        }
  97        for (i = 0; i < 32; i++) {
  98                if (p->imap_slots[i] == imap ||
  99                    p->imap_slots[i] == 0UL)
 100                        break;
 101        }
 102        if (i == 32) {
 103                printk("starfire_translate: Are you kidding me?\n");
 104                panic("Lucy in the sky....");
 105        }
 106        p->imap_slots[i] = imap;
 107
 108        /* map to real upaid */
 109        upaid = (((upaid & 0x3c) << 1) |
 110                 ((upaid & 0x40) >> 4) |
 111                 (upaid & 0x3));
 112
 113        upa_writel(upaid, p->tregs[i]);
 114
 115        return i;
 116}
 117