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 */
23 int this_is_starfire = 0;
24
25 void 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 */
38 struct starfire_irqinfo {
39 unsigned long imap_slots[32];
40 unsigned long tregs[32];
41 struct starfire_irqinfo *next;
42 int upaid, hwmid;
43 };
44
45 static struct starfire_irqinfo *sflist = NULL;
46
47 /* Beam me up Scott(McNeil)y... */
48 void 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
77 unsigned 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
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