arch/arc/include/asm/cache.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef __ARC_ASM_CACHE_H
  10 #define __ARC_ASM_CACHE_H
  11
  12 /* In case $$ not config, setup a dummy number for rest of kernel */
  13 #ifndef CONFIG_ARC_CACHE_LINE_SHIFT
  14 #define L1_CACHE_SHIFT          6
  15 #else
  16 #define L1_CACHE_SHIFT          CONFIG_ARC_CACHE_LINE_SHIFT
  17 #endif
  18
  19 #define L1_CACHE_BYTES          (1 << L1_CACHE_SHIFT)
  20
  21 /* For a rare case where customers have differently config I/D */
  22 #define ARC_ICACHE_LINE_LEN     L1_CACHE_BYTES
  23 #define ARC_DCACHE_LINE_LEN     L1_CACHE_BYTES
  24
  25 #define ICACHE_LINE_MASK        (~(ARC_ICACHE_LINE_LEN - 1))
  26 #define DCACHE_LINE_MASK        (~(ARC_DCACHE_LINE_LEN - 1))
  27
  28 /*
  29  * ARC700 doesn't cache any access in top 256M.
  30  * Ideal for wiring memory mapped peripherals as we don't need to do
  31  * explicit uncached accesses (LD.di/ST.di) hence more portable drivers
  32  */
  33 #define ARC_UNCACHED_ADDR_SPACE 0xc0000000
  34
  35 #ifndef __ASSEMBLY__
  36
  37 /* Uncached access macros */
  38 #define arc_read_uncached_32(ptr)       \
  39 ({                                      \
  40         unsigned int __ret;             \
  41         __asm__ __volatile__(           \
  42         "       ld.di %0, [%1]  \n"     \
  43         : "=r"(__ret)                   \
  44         : "r"(ptr));                    \
  45         __ret;                          \
  46 })
  47
  48 #define arc_write_uncached_32(ptr, data)\
  49 ({                                      \
  50         __asm__ __volatile__(           \
  51         "       st.di %0, [%1]  \n"     \
  52         :                               \
  53         : "r"(data), "r"(ptr));         \
  54 })
  55
  56 #define ARCH_DMA_MINALIGN      L1_CACHE_BYTES
  57
  58 extern void arc_cache_init(void);
  59 extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
  60 extern void read_decode_cache_bcr(void);
  61
  62 #endif  /* !__ASSEMBLY__ */
  63
  64 #endif /* _ASM_CACHE_H */