diff options
Diffstat (limited to 'arch/arm/cpu/arm_cortexa8/omap3/cache.S')
| -rw-r--r-- | arch/arm/cpu/arm_cortexa8/omap3/cache.S | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm_cortexa8/omap3/cache.S b/arch/arm/cpu/arm_cortexa8/omap3/cache.S new file mode 100644 index 000000000..0f6381535 --- /dev/null +++ b/arch/arm/cpu/arm_cortexa8/omap3/cache.S @@ -0,0 +1,191 @@ +/* + * 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} |