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(size: 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(fmt: "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 | |