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