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        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 */
  37struct starfire_irqinfo {
  38        unsigned long imap_slots[32];
  39        unsigned long tregs[32];
  40        struct starfire_irqinfo *next;
  41        int upaid, hwmid;
  42};
  43
  44static struct starfire_irqinfo *sflist = NULL;
  45
  46/* Beam me up Scott(McNeil)y... */
  47void 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
  76unsigned 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}
 112