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Diffstat (limited to 'arch/arm/mm/cache-fa.S')
| -rw-r--r-- | arch/arm/mm/cache-fa.S | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/arch/arm/mm/cache-fa.S b/arch/arm/mm/cache-fa.S new file mode 100644 index 000000000..3a464d164 --- /dev/null +++ b/arch/arm/mm/cache-fa.S @@ -0,0 +1,247 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/mm/cache-fa.S + * + * Copyright (C) 2005 Faraday Corp. + * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> + * + * Based on cache-v4wb.S: + * Copyright (C) 1997-2002 Russell king + * + * Processors: FA520 FA526 FA626 + */ +#include <linux/linkage.h> +#include <linux/init.h> +#include <asm/assembler.h> +#include <asm/memory.h> +#include <asm/page.h> + +#include "proc-macros.S" + +/* + * The size of one data cache line. + */ +#define CACHE_DLINESIZE 16 + +/* + * The total size of the data cache. + */ +#ifdef CONFIG_ARCH_GEMINI +#define CACHE_DSIZE 8192 +#else +#define CACHE_DSIZE 16384 +#endif + +/* FIXME: put optimal value here. Current one is just estimation */ +#define CACHE_DLIMIT (CACHE_DSIZE * 2) + +/* + * flush_icache_all() + * + * Unconditionally clean and invalidate the entire icache. + */ +ENTRY(fa_flush_icache_all) + mov r0, #0 + mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache + ret lr +ENDPROC(fa_flush_icache_all) + +/* + * flush_user_cache_all() + * + * Clean and invalidate all cache entries in a particular address + * space. + */ +ENTRY(fa_flush_user_cache_all) + /* FALLTHROUGH */ +/* + * flush_kern_cache_all() + * + * Clean and invalidate the entire cache. + */ +ENTRY(fa_flush_kern_cache_all) + mov ip, #0 + mov r2, #VM_EXEC +__flush_whole_cache: + mcr p15, 0, ip, c7, c14, 0 @ clean/invalidate D cache + tst r2, #VM_EXEC + mcrne p15, 0, ip, c7, c5, 0 @ invalidate I cache + mcrne p15, 0, ip, c7, c5, 6 @ invalidate BTB + mcrne p15, 0, ip, c7, c10, 4 @ drain write buffer + mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush + ret lr + +/* + * flush_user_cache_range(start, end, flags) + * + * Invalidate a range of cache entries in the specified + * address space. + * + * - start - start address (inclusive, page aligned) + * - end - end address (exclusive, page aligned) + * - flags - vma_area_struct flags describing address space + */ +ENTRY(fa_flush_user_cache_range) + mov ip, #0 + sub r3, r1, r0 @ calculate total size + cmp r3, #CACHE_DLIMIT @ total size >= limit? + bhs __flush_whole_cache @ flush whole D cache + +1: tst r2, #VM_EXEC + mcrne p15, 0, r0, c7, c5, 1 @ invalidate I line + mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + tst r2, #VM_EXEC + mcrne p15, 0, ip, c7, c5, 6 @ invalidate BTB + mcrne p15, 0, ip, c7, c10, 4 @ data write barrier + mcrne p15, 0, ip, c7, c5, 4 @ prefetch flush + ret lr + +/* + * coherent_kern_range(start, end) + * + * Ensure coherency between the Icache and the Dcache in the + * region described by start. If you have non-snooping + * Harvard caches, you need to implement this function. + * + * - start - virtual start address + * - end - virtual end address + */ +ENTRY(fa_coherent_kern_range) + /* fall through */ + +/* + * coherent_user_range(start, end) + * + * Ensure coherency between the Icache and the Dcache in the + * region described by start. If you have non-snooping + * Harvard caches, you need to implement this function. + * + * - start - virtual start address + * - end - virtual end address + */ +ENTRY(fa_coherent_user_range) + bic r0, r0, #CACHE_DLINESIZE - 1 +1: mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D entry + mcr p15, 0, r0, c7, c5, 1 @ invalidate I entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + mcr p15, 0, r0, c7, c5, 4 @ prefetch flush + ret lr + +/* + * flush_kern_dcache_area(void *addr, size_t size) + * + * Ensure that the data held in the page kaddr is written back + * to the page in question. + * + * - addr - kernel address + * - size - size of region + */ +ENTRY(fa_flush_kern_dcache_area) + add r1, r0, r1 +1: mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + ret lr + +/* + * dma_inv_range(start, end) + * + * Invalidate (discard) the specified virtual address range. + * May not write back any entries. If 'start' or 'end' + * are not cache line aligned, those lines must be written + * back. + * + * - start - virtual start address + * - end - virtual end address + */ +fa_dma_inv_range: + tst r0, #CACHE_DLINESIZE - 1 + bic r0, r0, #CACHE_DLINESIZE - 1 + mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D entry + tst r1, #CACHE_DLINESIZE - 1 + bic r1, r1, #CACHE_DLINESIZE - 1 + mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D entry +1: mcr p15, 0, r0, c7, c6, 1 @ invalidate D entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + ret lr + +/* + * dma_clean_range(start, end) + * + * Clean (write back) the specified virtual address range. + * + * - start - virtual start address + * - end - virtual end address + */ +fa_dma_clean_range: + bic r0, r0, #CACHE_DLINESIZE - 1 +1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + ret lr + +/* + * dma_flush_range(start,end) + * - start - virtual start address of region + * - end - virtual end address of region + */ +ENTRY(fa_dma_flush_range) + bic r0, r0, #CACHE_DLINESIZE - 1 +1: mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D entry + add r0, r0, #CACHE_DLINESIZE + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c10, 4 @ drain write buffer + ret lr + +/* + * dma_map_area(start, size, dir) + * - start - kernel virtual start address + * - size - size of region + * - dir - DMA direction + */ +ENTRY(fa_dma_map_area) + add r1, r1, r0 + cmp r2, #DMA_TO_DEVICE + beq fa_dma_clean_range + bcs fa_dma_inv_range + b fa_dma_flush_range +ENDPROC(fa_dma_map_area) + +/* + * dma_unmap_area(start, size, dir) + * - start - kernel virtual start address + * - size - size of region + * - dir - DMA direction + */ +ENTRY(fa_dma_unmap_area) + ret lr +ENDPROC(fa_dma_unmap_area) + + .globl fa_flush_kern_cache_louis + .equ fa_flush_kern_cache_louis, fa_flush_kern_cache_all + + __INITDATA + + @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S) + define_cache_functions fa |