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