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git://projects.qi-hardware.com/openwrt-xburst.git
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279 lines
6.3 KiB
ArmAsm
279 lines
6.3 KiB
ArmAsm
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/*
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* Cache-handling routined for MIPS 4K CPUs
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*
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* Copyright (c) 2003 Wolfgang Denk <wd@denx.de>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include <version.h>
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#include <asm/regdef.h>
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#include <asm/mipsregs.h>
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#include <asm/addrspace.h>
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#include <asm/cacheops.h>
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#if defined(CONFIG_IFX_MIPS)
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# include "ifx_cache.S"
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#endif
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/* 16KB is the maximum size of instruction and data caches on
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* MIPS 4K.
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*/
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#define MIPS_MAX_CACHE_SIZE 0x4000
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/*
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* cacheop macro to automate cache operations
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* first some helpers...
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*/
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#define _mincache(size, maxsize) \
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bltu size,maxsize,9f ; \
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move size,maxsize ; \
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9:
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#define _align(minaddr, maxaddr, linesize) \
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.set noat ; \
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subu AT,linesize,1 ; \
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not AT ; \
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and minaddr,AT ; \
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addu maxaddr,-1 ; \
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and maxaddr,AT ; \
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.set at
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/* general operations */
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#define doop1(op1) \
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cache op1,0(a0)
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#define doop2(op1, op2) \
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cache op1,0(a0) ; \
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nop ; \
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cache op2,0(a0)
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/* specials for cache initialisation */
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#define doop1lw(op1) \
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lw zero,0(a0)
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#define doop1lw1(op1) \
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cache op1,0(a0) ; \
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lw zero,0(a0) ; \
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cache op1,0(a0)
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#define doop121(op1,op2) \
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cache op1,0(a0) ; \
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nop; \
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cache op2,0(a0) ; \
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nop; \
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cache op1,0(a0)
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#define _oploopn(minaddr, maxaddr, linesize, tag, ops) \
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.set noreorder ; \
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10: doop##tag##ops ; \
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bne minaddr,maxaddr,10b ; \
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add minaddr,linesize ; \
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.set reorder
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/* finally the cache operation macros */
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#define vcacheopn(kva, n, cacheSize, cacheLineSize, tag, ops) \
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blez n,11f ; \
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addu n,kva ; \
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_align(kva, n, cacheLineSize) ; \
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_oploopn(kva, n, cacheLineSize, tag, ops) ; \
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11:
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#define icacheopn(kva, n, cacheSize, cacheLineSize, tag, ops) \
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_mincache(n, cacheSize); \
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blez n,11f ; \
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addu n,kva ; \
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_align(kva, n, cacheLineSize) ; \
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_oploopn(kva, n, cacheLineSize, tag, ops) ; \
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11:
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#define vcacheop(kva, n, cacheSize, cacheLineSize, op) \
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vcacheopn(kva, n, cacheSize, cacheLineSize, 1, (op))
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#define icacheop(kva, n, cacheSize, cacheLineSize, op) \
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icacheopn(kva, n, cacheSize, cacheLineSize, 1, (op))
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/*******************************************************************************
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*
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* mips_cache_reset - low level initialisation of the primary caches
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*
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* This routine initialises the primary caches to ensure that they
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* have good parity. It must be called by the ROM before any cached locations
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* are used to prevent the possibility of data with bad parity being written to
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* memory.
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* To initialise the instruction cache it is essential that a source of data
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* with good parity is available. This routine
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* will initialise an area of memory starting at location zero to be used as
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* a source of parity.
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*
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* RETURNS: N/A
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*
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*/
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.globl mips_cache_reset
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.ent mips_cache_reset
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mips_cache_reset:
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li t2, CFG_ICACHE_SIZE
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li t3, CFG_DCACHE_SIZE
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li t4, CFG_CACHELINE_SIZE
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move t5, t4
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li v0, MIPS_MAX_CACHE_SIZE
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/* Now clear that much memory starting from zero.
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*/
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li a0, KSEG1
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addu a1, a0, v0
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2: sw zero, 0(a0)
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sw zero, 4(a0)
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sw zero, 8(a0)
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sw zero, 12(a0)
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sw zero, 16(a0)
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sw zero, 20(a0)
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sw zero, 24(a0)
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sw zero, 28(a0)
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addu a0, 32
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bltu a0, a1, 2b
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/* Set invalid tag.
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*/
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mtc0 zero, CP0_TAGLO
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#if defined(CONFIG_IFX_MIPS) && defined(IFX_CACHE_EXTRA_INVALID_TAG)
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IFX_CACHE_EXTRA_INVALID_TAG
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#endif
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/*
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* The caches are probably in an indeterminate state,
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* so we force good parity into them by doing an
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* invalidate, load/fill, invalidate for each line.
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*/
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/* Assume bottom of RAM will generate good parity for the cache.
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*/
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li a0, K0BASE
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move a2, t2 # icacheSize
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move a3, t4 # icacheLineSize
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move a1, a2
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icacheopn(a0,a1,a2,a3,121,(Index_Store_Tag_I,Fill))
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#if defined(CONFIG_IFX_MIPS) && defined(IFX_CACHE_EXTRA_OPERATION)
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IFX_CACHE_EXTRA_OPERATION
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#else
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/* To support Orion/R4600, we initialise the data cache in 3 passes.
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*/
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/* 1: initialise dcache tags.
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*/
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li a0, K0BASE
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move a2, t3 # dcacheSize
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move a3, t5 # dcacheLineSize
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move a1, a2
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icacheop(a0,a1,a2,a3,Index_Store_Tag_D)
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/* 2: fill dcache.
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*/
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li a0, K0BASE
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move a2, t3 # dcacheSize
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move a3, t5 # dcacheLineSize
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move a1, a2
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icacheopn(a0,a1,a2,a3,1lw,(dummy))
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/* 3: clear dcache tags.
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*/
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li a0, K0BASE
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move a2, t3 # dcacheSize
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move a3, t5 # dcacheLineSize
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move a1, a2
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icacheop(a0,a1,a2,a3,Index_Store_Tag_D)
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#endif
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j ra
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.end mips_cache_reset
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/*******************************************************************************
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*
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* dcache_status - get cache status
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*
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* RETURNS: 0 - cache disabled; 1 - cache enabled
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*
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*/
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.globl dcache_status
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.ent dcache_status
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dcache_status:
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mfc0 v0, CP0_CONFIG
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andi v0, v0, 1
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j ra
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.end dcache_status
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/*******************************************************************************
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*
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* dcache_disable - disable cache
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*
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* RETURNS: N/A
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*
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*/
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.globl dcache_disable
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.ent dcache_disable
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dcache_disable:
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mfc0 t0, CP0_CONFIG
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li t1, -8
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and t0, t0, t1
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ori t0, t0, CONF_CM_UNCACHED
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mtc0 t0, CP0_CONFIG
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j ra
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.end dcache_disable
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/*******************************************************************************
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*
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* mips_cache_lock - lock RAM area pointed to by a0 in cache.
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*
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* RETURNS: N/A
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*
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*/
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#if defined(CONFIG_PURPLE)
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# define CACHE_LOCK_SIZE (CFG_DCACHE_SIZE/2)
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#else
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# define CACHE_LOCK_SIZE (CFG_DCACHE_SIZE)
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#endif
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.globl mips_cache_lock
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.ent mips_cache_lock
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mips_cache_lock:
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li a1, K0BASE - CACHE_LOCK_SIZE
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addu a0, a1
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li a2, CACHE_LOCK_SIZE
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li a3, CFG_CACHELINE_SIZE
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move a1, a2
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icacheop(a0,a1,a2,a3,0x1d)
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j ra
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.end mips_cache_lock
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