[PATCH] Remove hosthw.h from rio (unused file)
[wrt350n-kernel.git] / arch / mips / dec / wbflush.c
blob925c0525344bddaa69c6279c504f6c6659806824
1 /*
2 * Setup the right wbflush routine for the different DECstations.
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" :-)
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.
13 * Copyright (C) 1998 Harald Koerfgen
14 * Copyright (C) 2002 Maciej W. Rozycki
17 #include <linux/init.h>
19 #include <asm/bootinfo.h>
20 #include <asm/system.h>
21 #include <asm/wbflush.h>
23 static void wbflush_kn01(void);
24 static void wbflush_kn210(void);
25 static void wbflush_mips(void);
27 void (*__wbflush) (void);
29 void __init wbflush_setup(void)
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;
50 * For the DS3100 and DS5000/200 the R2020/R3220 writeback buffer functions
51 * as part of Coprocessor 0.
53 static void wbflush_kn01(void)
55 asm(".set\tpush\n\t"
56 ".set\tnoreorder\n\t"
57 "1:\tbc0f\t1b\n\t"
58 "nop\n\t"
59 ".set\tpop");
63 * For the DS5100 the writeback buffer seems to be a part of Coprocessor 3.
64 * But CP3 has to enabled first.
66 static void wbflush_kn210(void)
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");
84 * I/O ASIC systems use a standard writeback buffer that gets flushed
85 * upon an uncached read.
87 static void wbflush_mips(void)
89 __fast_iob();
92 #include <linux/module.h>
94 EXPORT_SYMBOL(__wbflush);