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/*
* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix@windriver.com>
*
* This file is based on and replaces the existing cache.c file
* The copyrights for the cache.c file are:
*
* (C) Copyright 2008 Texas Insturments
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <asm/arch/omap3.h>
/*
* omap3 cache code
*/
.align 5
.global invalidate_dcache
.global l2_cache_enable
.global l2_cache_disable
/*
* invalidate_dcache()
*
* Invalidate the whole D-cache.
*
* Corrupted registers: r0-r5, r7, r9-r11
*
* - mm - mm_struct describing address space
*/
invalidate_dcache:
stmfd r13!, {r0 - r5, r7, r9 - r12, r14}
mov r7, r0 @ take a backup of device type
cmp r0, #0x3 @ check if the device type is
@ GP
moveq r12, #0x1 @ set up to invalide L2
smi: .word 0x01600070 @ Call SMI monitor (smieq)
cmp r7, #0x3 @ compare again in case its
@ lost
beq finished_inval @ if GP device, inval done
@ above
mrc p15, 1, r0, c0, c0, 1 @ read clidr
ands r3, r0, #0x7000000 @ extract loc from clidr
mov r3, r3, lsr #23 @ left align loc bit field
beq finished_inval @ if loc is 0, then no need to
@ clean
mov r10, #0 @ start clean at cache level 0
inval_loop1:
add r2, r10, r10, lsr #1 @ work out 3x current cache
@ level
mov r1, r0, lsr r2 @ extract cache type bits from
@ clidr
and r1, r1, #7 @ mask of the bits for current
@ cache only
cmp r1, #2 @ see what cache we have at
@ this level
blt skip_inval @ skip if no cache, or just
@ i-cache
mcr p15, 2, r10, c0, c0, 0 @ select current cache level
@ in cssr
mov r2, #0 @ operand for mcr SBZ
mcr p15, 0, r2, c7, c5, 4 @ flush prefetch buffer to
@ sych the new cssr&csidr,
@ with armv7 this is 'isb',
@ but we compile with armv5
mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
and r2, r1, #7 @ extract the length of the
@ cache lines
add r2, r2, #4 @ add 4 (line length offset)
ldr r4, =0x3ff
ands r4, r4, r1, lsr #3 @ find maximum number on the
@ way size
clz r5, r4 @ find bit position of way
@ size increment
ldr r7, =0x7fff
ands r7, r7, r1, lsr #13 @ extract max number of the
@ index size
inval_loop2:
mov r9, r4 @ create working copy of max
@ way size
inval_loop3:
orr r11, r10, r9, lsl r5 @ factor way and cache number
@ into r11
orr r11, r11, r7, lsl r2 @ factor index number into r11
mcr p15, 0, r11, c7, c6, 2 @ invalidate by set/way
subs r9, r9, #1 @ decrement the way
bge inval_loop3
subs r7, r7, #1 @ decrement the index
bge inval_loop2
skip_inval:
add r10, r10, #2 @ increment cache number
cmp r3, r10
bgt inval_loop1
finished_inval:
mov r10, #0 @ swith back to cache level 0
mcr p15, 2, r10, c0, c0, 0 @ select current cache level
@ in cssr
mcr p15, 0, r10, c7, c5, 4 @ flush prefetch buffer,
@ with armv7 this is 'isb',
@ but we compile with armv5
ldmfd r13!, {r0 - r5, r7, r9 - r12, pc}
l2_cache_enable:
push {r0, r1, r2, lr}
@ ES2 onwards we can disable/enable L2 ourselves
bl get_cpu_rev
cmp r0, #CPU_3XX_ES20
blt l2_cache_disable_EARLIER_THAN_ES2
mrc 15, 0, r3, cr1, cr0, 1
orr r3, r3, #2
mcr 15, 0, r3, cr1, cr0, 1
b l2_cache_enable_END
l2_cache_enable_EARLIER_THAN_ES2:
@ Save r0, r12 and restore them after usage
mov r3, ip
str r3, [sp, #4]
mov r3, r0
@
@ GP Device ROM code API usage here
@ r12 = AUXCR Write function and r0 value
@
mov ip, #3
mrc 15, 0, r0, cr1, cr0, 1
orr r0, r0, #2
@ SMI instruction to call ROM Code API
.word 0xe1600070
mov r0, r3
mov ip, r3
str r3, [sp, #4]
l2_cache_enable_END:
pop {r1, r2, r3, pc}
l2_cache_disable:
push {r0, r1, r2, lr}
@ ES2 onwards we can disable/enable L2 ourselves
bl get_cpu_rev
cmp r0, #CPU_3XX_ES20
blt l2_cache_disable_EARLIER_THAN_ES2
mrc 15, 0, r3, cr1, cr0, 1
bic r3, r3, #2
mcr 15, 0, r3, cr1, cr0, 1
b l2_cache_disable_END
l2_cache_disable_EARLIER_THAN_ES2:
@ Save r0, r12 and restore them after usage
mov r3, ip
str r3, [sp, #4]
mov r3, r0
@
@ GP Device ROM code API usage here
@ r12 = AUXCR Write function and r0 value
@
mov ip, #3
mrc 15, 0, r0, cr1, cr0, 1
bic r0, r0, #2
@ SMI instruction to call ROM Code API
.word 0xe1600070
mov r0, r3
mov ip, r3
str r3, [sp, #4]
l2_cache_disable_END:
pop {r1, r2, r3, pc}
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