diff options
Diffstat (limited to 'arch/arm/cpu')
-rw-r--r-- | arch/arm/cpu/armv7/Makefile | 2 | ||||
-rw-r--r-- | arch/arm/cpu/armv7/cache_v7.c | 41 | ||||
-rw-r--r-- | arch/arm/cpu/armv7/cache_v7_asm.S | 84 |
3 files changed, 91 insertions, 36 deletions
diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile index 45f346c949..328c4b10e9 100644 --- a/arch/arm/cpu/armv7/Makefile +++ b/arch/arm/cpu/armv7/Makefile @@ -7,7 +7,7 @@ extra-y := start.o -obj-y += cache_v7.o +obj-y += cache_v7.o cache_v7_asm.o obj-y += cpu.o cp15.o obj-y += syslib.o diff --git a/arch/arm/cpu/armv7/cache_v7.c b/arch/arm/cpu/armv7/cache_v7.c index 94ff48859e..dd07ba1768 100644 --- a/arch/arm/cpu/armv7/cache_v7.c +++ b/arch/arm/cpu/armv7/cache_v7.c @@ -16,6 +16,10 @@ #define ARMV7_DCACHE_CLEAN_INVAL_RANGE 4 #ifndef CONFIG_SYS_DCACHE_OFF + +/* Asm functions from cache_v7_asm.S */ +void v7_flush_dcache_all(void); + static int check_cache_range(unsigned long start, unsigned long stop) { int ok = 1; @@ -88,34 +92,6 @@ static void v7_inval_dcache_level_setway(u32 level, u32 num_sets, DSB; } -static void v7_clean_inval_dcache_level_setway(u32 level, u32 num_sets, - u32 num_ways, u32 way_shift, - u32 log2_line_len) -{ - int way, set; - u32 setway; - - /* - * For optimal assembly code: - * a. count down - * b. have bigger loop inside - */ - for (way = num_ways - 1; way >= 0 ; way--) { - for (set = num_sets - 1; set >= 0; set--) { - setway = (level << 1) | (set << log2_line_len) | - (way << way_shift); - /* - * Clean & Invalidate data/unified - * cache line by set/way - */ - asm volatile (" mcr p15, 0, %0, c7, c14, 2" - : : "r" (setway)); - } - } - /* DSB to make sure the operation is complete */ - DSB; -} - static void v7_maint_dcache_level_setway(u32 level, u32 operation) { u32 ccsidr; @@ -142,13 +118,8 @@ static void v7_maint_dcache_level_setway(u32 level, u32 operation) log2_num_ways = log_2_n_round_up(num_ways); way_shift = (32 - log2_num_ways); - if (operation == ARMV7_DCACHE_INVAL_ALL) { - v7_inval_dcache_level_setway(level, num_sets, num_ways, + v7_inval_dcache_level_setway(level, num_sets, num_ways, way_shift, log2_line_len); - } else if (operation == ARMV7_DCACHE_CLEAN_INVAL_ALL) { - v7_clean_inval_dcache_level_setway(level, num_sets, num_ways, - way_shift, log2_line_len); - } } static void v7_maint_dcache_all(u32 operation) @@ -263,7 +234,7 @@ void invalidate_dcache_all(void) */ void flush_dcache_all(void) { - v7_maint_dcache_all(ARMV7_DCACHE_CLEAN_INVAL_ALL); + v7_flush_dcache_all(); v7_outer_cache_flush_all(); } diff --git a/arch/arm/cpu/armv7/cache_v7_asm.S b/arch/arm/cpu/armv7/cache_v7_asm.S new file mode 100644 index 0000000000..2e4629f927 --- /dev/null +++ b/arch/arm/cpu/armv7/cache_v7_asm.S @@ -0,0 +1,84 @@ +/* + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <config.h> +#include <linux/linkage.h> +#include <linux/sizes.h> +#include <asm/system.h> + +#ifdef CONFIG_SYS_THUMB_BUILD +#define ARM(x...) +#define THUMB(x...) x +#else +#define ARM(x...) x +#define THUMB(x...) +#endif + +/* + * v7_flush_dcache_all() + * + * Flush the whole D-cache. + * + * Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode) + * + * Note: copied from arch/arm/mm/cache-v7.S of Linux 4.4 + */ +ENTRY(__v7_flush_dcache_all) + dmb @ ensure ordering with previous memory accesses + mrc p15, 1, r0, c0, c0, 1 @ read clidr + mov r3, r0, lsr #23 @ move LoC into position + ands r3, r3, #7 << 1 @ extract LoC*2 from clidr + beq finished @ if loc is 0, then no need to clean +start_flush_levels: + mov r10, #0 @ start clean at cache level 0 +flush_levels: + 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 @ skip if no cache, or just i-cache + mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr + isb @ isb to sych the new cssr&csidr + 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) + movw 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 + movw r7, #0x7fff + ands r7, r7, r1, lsr #13 @ extract max number of the index size +loop1: + mov r9, r7 @ create working copy of max index +loop2: + ARM( orr r11, r10, r4, lsl r5 ) @ factor way and cache number into r11 + THUMB( lsl r6, r4, r5 ) + THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11 + ARM( orr r11, r11, r9, lsl r2 ) @ factor index number into r11 + THUMB( lsl r6, r9, r2 ) + THUMB( orr r11, r11, r6 ) @ factor index number into r11 + mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way + subs r9, r9, #1 @ decrement the index + bge loop2 + subs r4, r4, #1 @ decrement the way + bge loop1 +skip: + add r10, r10, #2 @ increment cache number + cmp r3, r10 + bgt flush_levels +finished: + mov r10, #0 @ swith back to cache level 0 + mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr + dsb st + isb + bx lr +ENDPROC(__v7_flush_dcache_all) + +ENTRY(v7_flush_dcache_all) + ARM( stmfd sp!, {r4-r5, r7, r9-r11, lr} ) + THUMB( stmfd sp!, {r4-r7, r9-r11, lr} ) + bl __v7_flush_dcache_all + ARM( ldmfd sp!, {r4-r5, r7, r9-r11, lr} ) + THUMB( ldmfd sp!, {r4-r7, r9-r11, lr} ) + bx lr +ENDPROC(v7_flush_dcache_all) |