1// SPDX-License-Identifier: GPL-2.0
2/*
3 * starfire.c: Starfire/E10000 support.
4 *
5 * Copyright (C) 1998 David S. Miller (davem@redhat.com)
6 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
7 */
8
9#include <linux/kernel.h>
10#include <linux/slab.h>
11
12#include <asm/page.h>
13#include <asm/oplib.h>
14#include <asm/smp.h>
15#include <asm/upa.h>
16#include <asm/starfire.h>
17
18/*
19 * A few places around the kernel check this to see if
20 * they need to call us to do things in a Starfire specific
21 * way.
22 */
23int this_is_starfire = 0;
24
25void check_if_starfire(void)
26{
27	phandle ssnode = prom_finddevice("/ssp-serial");
28	if (ssnode != 0 && (s32)ssnode != -1)
29		this_is_starfire = 1;
30}
31
32/*
33 * Each Starfire board has 32 registers which perform translation
34 * and delivery of traditional interrupt packets into the extended
35 * Starfire hardware format.  Essentially UPAID's now have 2 more
36 * bits than in all previous Sun5 systems.
37 */
38struct starfire_irqinfo {
39	unsigned long imap_slots[32];
40	unsigned long tregs[32];
41	struct starfire_irqinfo *next;
42	int upaid, hwmid;
43};
44
45static struct starfire_irqinfo *sflist = NULL;
46
47/* Beam me up Scott(McNeil)y... */
48void starfire_hookup(int upaid)
49{
50	struct starfire_irqinfo *p;
51	unsigned long treg_base, hwmid, i;
52
53	p = kmalloc(sizeof(*p), GFP_KERNEL);
54	if (!p) {
55		prom_printf("starfire_hookup: No memory, this is insane.\n");
56		prom_halt();
57	}
58	treg_base = 0x100fc000000UL;
59	hwmid = ((upaid & 0x3c) << 1) |
60		((upaid & 0x40) >> 4) |
61		(upaid & 0x3);
62	p->hwmid = hwmid;
63	treg_base += (hwmid << 33UL);
64	treg_base += 0x200UL;
65	for (i = 0; i < 32; i++) {
66		p->imap_slots[i] = 0UL;
67		p->tregs[i] = treg_base + (i * 0x10UL);
68		/* Lets play it safe and not overwrite existing mappings */
69		if (upa_readl(p->tregs[i]) != 0)
70			p->imap_slots[i] = 0xdeadbeaf;
71	}
72	p->upaid = upaid;
73	p->next = sflist;
74	sflist = p;
75}
76
77unsigned int starfire_translate(unsigned long imap,
78				unsigned int upaid)
79{
80	struct starfire_irqinfo *p;
81	unsigned int bus_hwmid;
82	unsigned int i;
83
84	bus_hwmid = (((unsigned long)imap) >> 33) & 0x7f;
85	for (p = sflist; p != NULL; p = p->next)
86		if (p->hwmid == bus_hwmid)
87			break;
88	if (p == NULL) {
89		prom_printf("XFIRE: Cannot find irqinfo for imap %016lx\n",
90			    ((unsigned long)imap));
91		prom_halt();
92	}
93	for (i = 0; i < 32; i++) {
94		if (p->imap_slots[i] == imap ||
95		    p->imap_slots[i] == 0UL)
96			break;
97	}
98	if (i == 32) {
99		printk("starfire_translate: Are you kidding me?\n");
100		panic("Lucy in the sky....");
101	}
102	p->imap_slots[i] = imap;
103
104	/* map to real upaid */
105	upaid = (((upaid & 0x3c) << 1) |
106		 ((upaid & 0x40) >> 4) |
107		 (upaid & 0x3));
108
109	upa_writel(upaid, p->tregs[i]);
110
111	return i;
112}
113