Commit | Line | Data |
---|---|---|
b0c62724 MS |
1 | /* |
2 | * Support for MicroBlaze PVR (processor version register) | |
3 | * | |
4 | * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> | |
5 | * Copyright (C) 2007-2009 PetaLogix | |
6 | * Copyright (C) 2007 John Williams <john.williams@petalogix.com> | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU General Public | |
9 | * License. See the file "COPYING" in the main directory of this archive | |
10 | * for more details. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/compiler.h> | |
15 | #include <asm/system.h> | |
16 | #include <asm/exceptions.h> | |
17 | #include <asm/pvr.h> | |
18 | ||
19 | /* | |
20 | * Until we get an assembler that knows about the pvr registers, | |
21 | * this horrible cruft will have to do. | |
22 | * That hardcoded opcode is mfs r3, rpvrNN | |
23 | */ | |
24 | ||
25 | #define get_single_pvr(pvrid, val) \ | |
26 | { \ | |
27 | register unsigned tmp __asm__("r3"); \ | |
28 | tmp = 0x0; /* Prevent warning about unused */ \ | |
29 | __asm__ __volatile__ ( \ | |
16497004 | 30 | "mfs %0, rpvr" #pvrid ";" \ |
b0c62724 MS |
31 | : "=r" (tmp) : : "memory"); \ |
32 | val = tmp; \ | |
33 | } | |
34 | ||
35 | /* | |
36 | * Does the CPU support the PVR register? | |
37 | * return value: | |
38 | * 0: no PVR | |
39 | * 1: simple PVR | |
40 | * 2: full PVR | |
41 | * | |
42 | * This must work on all CPU versions, including those before the | |
43 | * PVR was even an option. | |
44 | */ | |
45 | ||
46 | int cpu_has_pvr(void) | |
47 | { | |
a3cd613b | 48 | unsigned long flags; |
b0c62724 MS |
49 | unsigned pvr0; |
50 | ||
51 | local_save_flags(flags); | |
52 | ||
53 | /* PVR bit in MSR tells us if there is any support */ | |
54 | if (!(flags & PVR_MSR_BIT)) | |
55 | return 0; | |
56 | ||
16497004 | 57 | get_single_pvr(0, pvr0); |
b0c62724 MS |
58 | pr_debug("%s: pvr0 is 0x%08x\n", __func__, pvr0); |
59 | ||
60 | if (pvr0 & PVR0_PVR_FULL_MASK) | |
61 | return 1; | |
62 | ||
63 | /* for partial PVR use static cpuinfo */ | |
64 | return 2; | |
65 | } | |
66 | ||
67 | void get_pvr(struct pvr_s *p) | |
68 | { | |
69 | get_single_pvr(0, p->pvr[0]); | |
70 | get_single_pvr(1, p->pvr[1]); | |
71 | get_single_pvr(2, p->pvr[2]); | |
72 | get_single_pvr(3, p->pvr[3]); | |
73 | get_single_pvr(4, p->pvr[4]); | |
74 | get_single_pvr(5, p->pvr[5]); | |
75 | get_single_pvr(6, p->pvr[6]); | |
76 | get_single_pvr(7, p->pvr[7]); | |
77 | get_single_pvr(8, p->pvr[8]); | |
78 | get_single_pvr(9, p->pvr[9]); | |
79 | get_single_pvr(10, p->pvr[10]); | |
80 | get_single_pvr(11, p->pvr[11]); | |
81 | } |