95 lines
2.0 KiB
C
95 lines
2.0 KiB
C
|
/*
|
||
|
|
* Setup the right wbflush routine for the different DECstations.
|
||
|
|
*
|
||
|
|
* Created with information from:
|
||
|
|
* DECstation 3100 Desktop Workstation Functional Specification
|
||
|
|
* DECstation 5000/200 KN02 System Module Functional Specification
|
||
|
|
* mipsel-linux-objdump --disassemble vmunix | grep "wbflush" :-)
|
||
|
|
*
|
||
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
||
|
|
* License. See the file "COPYING" in the main directory of this archive
|
||
|
|
* for more details.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1998 Harald Koerfgen
|
||
|
|
* Copyright (C) 2002 Maciej W. Rozycki
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/init.h>
|
||
|
|
|
||
|
|
#include <asm/bootinfo.h>
|
||
|
|
#include <asm/wbflush.h>
|
||
|
|
#include <asm/barrier.h>
|
||
|
|
|
||
|
|
static void wbflush_kn01(void);
|
||
|
|
static void wbflush_kn210(void);
|
||
|
|
static void wbflush_mips(void);
|
||
|
|
|
||
|
|
void (*__wbflush) (void);
|
||
|
|
|
||
|
|
void __init wbflush_setup(void)
|
||
|
|
{
|
||
|
|
switch (mips_machtype) {
|
||
|
|
case MACH_DS23100:
|
||
|
|
case MACH_DS5000_200: /* DS5000 3max */
|
||
|
|
__wbflush = wbflush_kn01;
|
||
|
|
break;
|
||
|
|
case MACH_DS5100: /* DS5100 MIPSMATE */
|
||
|
|
__wbflush = wbflush_kn210;
|
||
|
|
break;
|
||
|
|
case MACH_DS5000_1XX: /* DS5000/100 3min */
|
||
|
|
case MACH_DS5000_XX: /* Personal DS5000/2x */
|
||
|
|
case MACH_DS5000_2X0: /* DS5000/240 3max+ */
|
||
|
|
case MACH_DS5900: /* DS5900 bigmax */
|
||
|
|
default:
|
||
|
|
__wbflush = wbflush_mips;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For the DS3100 and DS5000/200 the R2020/R3220 writeback buffer functions
|
||
|
|
* as part of Coprocessor 0.
|
||
|
|
*/
|
||
|
|
static void wbflush_kn01(void)
|
||
|
|
{
|
||
|
|
asm(".set\tpush\n\t"
|
||
|
|
".set\tnoreorder\n\t"
|
||
|
|
"1:\tbc0f\t1b\n\t"
|
||
|
|
"nop\n\t"
|
||
|
|
".set\tpop");
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For the DS5100 the writeback buffer seems to be a part of Coprocessor 3.
|
||
|
|
* But CP3 has to enabled first.
|
||
|
|
*/
|
||
|
|
static void wbflush_kn210(void)
|
||
|
|
{
|
||
|
|
asm(".set\tpush\n\t"
|
||
|
|
".set\tnoreorder\n\t"
|
||
|
|
"mfc0\t$2,$12\n\t"
|
||
|
|
"lui\t$3,0x8000\n\t"
|
||
|
|
"or\t$3,$2,$3\n\t"
|
||
|
|
"mtc0\t$3,$12\n\t"
|
||
|
|
"nop\n"
|
||
|
|
"1:\tbc3f\t1b\n\t"
|
||
|
|
"nop\n\t"
|
||
|
|
"mtc0\t$2,$12\n\t"
|
||
|
|
"nop\n\t"
|
||
|
|
".set\tpop"
|
||
|
|
: : : "$2", "$3");
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* I/O ASIC systems use a standard writeback buffer that gets flushed
|
||
|
|
* upon an uncached read.
|
||
|
|
*/
|
||
|
|
static void wbflush_mips(void)
|
||
|
|
{
|
||
|
|
__fast_iob();
|
||
|
|
}
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(__wbflush);
|