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// SPDX-License-Identifier: GPL-2.0
/*
* 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)
{
phandle ssnode = prom_finddevice("/ssp-serial");
if (ssnode != 0 && (s32)ssnode != -1)
this_is_starfire = 1;
}
/*
* 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;
}
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