/* * 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/system.h> #include <asm/wbflush.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);