/*
* File: arch/blackfin/mach-common/cache.S
* Based on:
* Author: LG Soft India
*
* Created:
* Description: cache control support
*
* Modified:
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/linkage.h>
#include <asm/cplb.h>
#include <asm/entry.h>
#include <asm/blackfin.h>
#include <asm/cache.h>
.text
.align 2
ENTRY(_cache_invalidate)
/*
* Icache or DcacheA or DcacheB Invalidation
* or any combination thereof
* R0 has bits
* CPLB_ENABLE_ICACHE_P,CPLB_ENABLE_DCACHE_P,CPLB_ENABLE_DCACHE2_P
* set as required
*/
[--SP] = R7;
R7 = R0;
CC = BITTST(R7,CPLB_ENABLE_ICACHE_P);
IF !CC JUMP .Lno_icache;
[--SP] = RETS;
CALL _icache_invalidate;
RETS = [SP++];
.Lno_icache:
CC = BITTST(R7,CPLB_ENABLE_DCACHE_P);
IF !CC JUMP .Lno_dcache_a;
R0 = 0; /* specifies bank A */
[--SP] = RETS;
CALL _dcache_invalidate;
RETS = [SP++];
.Lno_dcache_a:
CC = BITTST(R7,CPLB_ENABLE_DCACHE2_P);
IF !CC JUMP .Lno_dcache_b;
R0 = 0;
BITSET(R0, 23); /* specifies bank B */
[--SP] = RETS;
CALL _dcache_invalidate;
RETS = [SP++];
.Lno_dcache_b:
R7 = [SP++];
RTS;
ENDPROC(_cache_invalidate)
/* Invalidate the Entire Instruction cache by
* disabling IMC bit
*/
ENTRY(_icache_invalidate)
ENTRY(_invalidate_entire_icache)
[--SP] = ( R7:5);
P0.L = (IMEM_CONTROL & 0xFFFF);
P0.H = (IMEM_CONTROL >> 16);
R7 = [P0];
/* Clear the IMC bit , All valid bits in the instruction
* cache are set to the invalid state
*/
BITCLR(R7,IMC_P);
CLI R6;
SSYNC; /* SSYNC required before invalidating cache. */
.align 8;
[P0] = R7;
SSYNC;
STI R6;
/* Configures the instruction cache agian */
R6 = (IMC | ENICPLB);
R7 = R7 | R6;
CLI R6;
SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */
.align 8;
[P0] = R7;
SSYNC;
STI R6;
( R7:5) = [SP++];
RTS;
ENDPROC(_invalidate_entire_icache)
ENDPROC(_icache_invalidate)
/*
* blackfin_cache_flush_range(start, end)
* Invalidate all cache lines assocoiated with this
* area of memory.
*
* start: Start address
* end: End address
*/
ENTRY(_blackfin_icache_flush_range)
R2 = -L1_CACHE_BYTES;
R2 = R0 & R2;
P0 = R2;
P1 = R1;
CSYNC;
IFLUSH [P0];
1:
IFLUSH [P0++];
CC = P0 < P1 (iu);
IF CC JUMP 1b (bp);
IFLUSH [P0];
SSYNC;
RTS;
ENDPROC(_blackfin_icache_flush_range)
/*
* blackfin_icache_dcache_flush_range(start, end)
* FLUSH all cache lines assocoiated with this
* area of memory.
*
* start: Start address
* end: End address
*/
ENTRY(_blackfin_icache_dcache_flush_range)
R2 = -L1_CACHE_BYTES;
R2 = R0 & R2;
P0 = R2;
P1 = R1;
CSYNC;
IFLUSH [P0];
1:
FLUSH [P0];
IFLUSH [P0++];
CC = P0 < P1 (iu);
IF CC JUMP 1b (bp);
IFLUSH [P0];
FLUSH [P0];
SSYNC;
RTS;
ENDPROC(_blackfin_icache_dcache_flush_range)
/* Throw away all D-cached data in specified region without any obligation to
* write them back. However, we must clean the D-cached entries around the
* boundaries of the start and/or end address is not cache aligned.
*
* Start: start address,
* end : end address.
*/
ENTRY(_blackfin_dcache_invalidate_range)
R2 = -L1_CACHE_BYTES;
R2 = R0 & R2;
P0 = R2;
P1 = R1;
CSYNC;
FLUSHINV[P0];
1:
FLUSHINV[P0++];
CC = P0 < P1 (iu);
IF CC JUMP 1b (bp);
/* If the data crosses a cache line, then we'll be pointing to
* the last cache line, but won't have flushed/invalidated it yet,
* so do one more.
*/
FLUSHINV[P0];
SSYNC;
RTS;
ENDPROC(_blackfin_dcache_invalidate_range)
/* Invalidate the Entire Data cache by
* clearing DMC[1:0] bits
*/
ENTRY(_invalidate_entire_dcache)
ENTRY(_dcache_invalidate)
[--SP] = ( R7:6);
P0.L = (DMEM_CONTROL & 0xFFFF);
P0.H = (DMEM_CONTROL >> 16);
R7 = [P0];
/* Clear the DMC[1:0] bits, All valid bits in the data
* cache are set to the invalid state
*/
BITCLR(R7,DMC0_P);
BITCLR(R7,DMC1_P);
CLI R6;
SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
.align 8;
[P0] = R7;
SSYNC;
STI R6;
/* Configures the data cache again */
R6 = DMEM_CNTR;
R7 = R7 | R6;
CLI R6;
SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */
.align 8;
[P0] = R7;
SSYNC;
STI R6;
( R7:6) = [SP++];
RTS;
ENDPROC(_dcache_invalidate)
ENDPROC(_invalidate_entire_dcache)
ENTRY(_blackfin_dcache_flush_range)
R2 = -L1_CACHE_BYTES;
R2 = R0 & R2;
P0 = R2;
P1 = R1;
CSYNC;
FLUSH[P0];
1:
FLUSH[P0++];
CC = P0 < P1 (iu);
IF CC JUMP 1b (bp);
/* If the data crosses a cache line, then we'll be pointing to
* the last cache line, but won't have flushed it yet, so do
* one more.
*/
FLUSH[P0];
SSYNC;
RTS;
ENDPROC(_blackfin_dcache_flush_range)
ENTRY(_blackfin_dflush_page)
P1 = 1 << (PAGE_SHIFT - L1_CACHE_SHIFT);
P0 = R0;
CSYNC;
FLUSH[P0];
LSETUP (.Lfl1, .Lfl1) LC0 = P1;
.Lfl1: FLUSH [P0++];
SSYNC;
RTS;
ENDPROC(_blackfin_dflush_page)
