Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b00dc837 | 2 | /* |
1da177e4 LT |
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 | { | |
8d125562 | 27 | phandle ssnode = prom_finddevice("/ssp-serial"); |
4a3a2552 | 28 | if (ssnode != 0 && (s32)ssnode != -1) |
1da177e4 LT |
29 | this_is_starfire = 1; |
30 | } | |
31 | ||
1da177e4 LT |
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... */ | |
286bbe87 | 48 | void starfire_hookup(int upaid) |
1da177e4 LT |
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; | |
1da177e4 LT |
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 | } |