Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Setup the right wbflush routine for the different DECstations. | |
3 | * | |
4 | * Created with information from: | |
70342287 RB |
5 | * DECstation 3100 Desktop Workstation Functional Specification |
6 | * DECstation 5000/200 KN02 System Module Functional Specification | |
7 | * mipsel-linux-objdump --disassemble vmunix | grep "wbflush" :-) | |
1da177e4 LT |
8 | * |
9 | * This file is subject to the terms and conditions of the GNU General Public | |
10 | * License. See the file "COPYING" in the main directory of this archive | |
11 | * for more details. | |
12 | * | |
13 | * Copyright (C) 1998 Harald Koerfgen | |
14 | * Copyright (C) 2002 Maciej W. Rozycki | |
15 | */ | |
16 | ||
17 | #include <linux/init.h> | |
18 | ||
19 | #include <asm/bootinfo.h> | |
1da177e4 | 20 | #include <asm/wbflush.h> |
b81947c6 | 21 | #include <asm/barrier.h> |
1da177e4 LT |
22 | |
23 | static void wbflush_kn01(void); | |
24 | static void wbflush_kn210(void); | |
25 | static void wbflush_mips(void); | |
26 | ||
27 | void (*__wbflush) (void); | |
28 | ||
29 | void __init wbflush_setup(void) | |
30 | { | |
31 | switch (mips_machtype) { | |
32 | case MACH_DS23100: | |
33 | case MACH_DS5000_200: /* DS5000 3max */ | |
34 | __wbflush = wbflush_kn01; | |
35 | break; | |
36 | case MACH_DS5100: /* DS5100 MIPSMATE */ | |
37 | __wbflush = wbflush_kn210; | |
38 | break; | |
39 | case MACH_DS5000_1XX: /* DS5000/100 3min */ | |
40 | case MACH_DS5000_XX: /* Personal DS5000/2x */ | |
41 | case MACH_DS5000_2X0: /* DS5000/240 3max+ */ | |
42 | case MACH_DS5900: /* DS5900 bigmax */ | |
43 | default: | |
44 | __wbflush = wbflush_mips; | |
45 | break; | |
46 | } | |
47 | } | |
48 | ||
49 | /* | |
50 | * For the DS3100 and DS5000/200 the R2020/R3220 writeback buffer functions | |
51 | * as part of Coprocessor 0. | |
52 | */ | |
53 | static void wbflush_kn01(void) | |
54 | { | |
55 | asm(".set\tpush\n\t" | |
56 | ".set\tnoreorder\n\t" | |
57 | "1:\tbc0f\t1b\n\t" | |
58 | "nop\n\t" | |
59 | ".set\tpop"); | |
60 | } | |
61 | ||
62 | /* | |
63 | * For the DS5100 the writeback buffer seems to be a part of Coprocessor 3. | |
64 | * But CP3 has to enabled first. | |
65 | */ | |
66 | static void wbflush_kn210(void) | |
67 | { | |
68 | asm(".set\tpush\n\t" | |
69 | ".set\tnoreorder\n\t" | |
70 | "mfc0\t$2,$12\n\t" | |
71 | "lui\t$3,0x8000\n\t" | |
72 | "or\t$3,$2,$3\n\t" | |
73 | "mtc0\t$3,$12\n\t" | |
74 | "nop\n" | |
75 | "1:\tbc3f\t1b\n\t" | |
76 | "nop\n\t" | |
77 | "mtc0\t$2,$12\n\t" | |
78 | "nop\n\t" | |
79 | ".set\tpop" | |
80 | : : : "$2", "$3"); | |
81 | } | |
82 | ||
83 | /* | |
84 | * I/O ASIC systems use a standard writeback buffer that gets flushed | |
85 | * upon an uncached read. | |
86 | */ | |
87 | static void wbflush_mips(void) | |
88 | { | |
89 | __fast_iob(); | |
90 | } | |
91 | ||
92 | #include <linux/module.h> | |
93 | ||
94 | EXPORT_SYMBOL(__wbflush); |