diff options
Diffstat (limited to 'arch/arc/include/asm/cache.h')
-rw-r--r-- | arch/arc/include/asm/cache.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/arc/include/asm/cache.h b/arch/arc/include/asm/cache.h new file mode 100644 index 00000000000..6632273861f --- /dev/null +++ b/arch/arc/include/asm/cache.h @@ -0,0 +1,75 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __ARC_ASM_CACHE_H +#define __ARC_ASM_CACHE_H + +/* In case $$ not config, setup a dummy number for rest of kernel */ +#ifndef CONFIG_ARC_CACHE_LINE_SHIFT +#define L1_CACHE_SHIFT 6 +#else +#define L1_CACHE_SHIFT CONFIG_ARC_CACHE_LINE_SHIFT +#endif + +#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT) + +#define ARC_ICACHE_WAYS 2 +#define ARC_DCACHE_WAYS 4 + +/* Helpers */ +#define ARC_ICACHE_LINE_LEN L1_CACHE_BYTES +#define ARC_DCACHE_LINE_LEN L1_CACHE_BYTES + +#define ICACHE_LINE_MASK (~(ARC_ICACHE_LINE_LEN - 1)) +#define DCACHE_LINE_MASK (~(ARC_DCACHE_LINE_LEN - 1)) + +#if ARC_ICACHE_LINE_LEN != ARC_DCACHE_LINE_LEN +#error "Need to fix some code as I/D cache lines not same" +#else +#define is_not_cache_aligned(p) ((unsigned long)p & (~DCACHE_LINE_MASK)) +#endif + +#ifndef __ASSEMBLY__ + +/* Uncached access macros */ +#define arc_read_uncached_32(ptr) \ +({ \ + unsigned int __ret; \ + __asm__ __volatile__( \ + " ld.di %0, [%1] \n" \ + : "=r"(__ret) \ + : "r"(ptr)); \ + __ret; \ +}) + +#define arc_write_uncached_32(ptr, data)\ +({ \ + __asm__ __volatile__( \ + " st.di %0, [%1] \n" \ + : \ + : "r"(data), "r"(ptr)); \ +}) + +/* used to give SHMLBA a value to avoid Cache Aliasing */ +extern unsigned int ARC_shmlba; + +#define ARCH_DMA_MINALIGN L1_CACHE_BYTES + +/* + * ARC700 doesn't cache any access in top 256M. + * Ideal for wiring memory mapped peripherals as we don't need to do + * explicit uncached accesses (LD.di/ST.di) hence more portable drivers + */ +#define ARC_UNCACHED_ADDR_SPACE 0xc0000000 + +extern void arc_cache_init(void); +extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len); +extern void __init read_decode_cache_bcr(void); +#endif + +#endif /* _ASM_CACHE_H */ |