| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Setup the right wbflush routine for the different DECstations. |
| 3 | * |
| 4 | * Created with information from: |
| 5 | * DECstation 3100 Desktop Workstation Functional Specification |
| 6 | * DECstation 5000/200 KN02 System Module Functional Specification |
| 7 | * mipsel-linux-objdump --disassemble vmunix | grep "wbflush" :-) |
| 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> |
| 20 | #include <asm/system.h> |
| 21 | #include <asm/wbflush.h> |
| 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); |