LXR linux/arch/microblaze/include/asm/cacheflush.h

   1/*
   2 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   3 * Copyright (C) 2007-2009 PetaLogix
   4 * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
   5 * based on v850 version which was
   6 * Copyright (C) 2001,02,03 NEC Electronics Corporation
   7 * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
   8 *
   9 * This file is subject to the terms and conditions of the GNU General
  10 * Public License. See the file COPYING in the main directory of this
  11 * archive for more details.
  12 *
  13 */
  14
  15#ifndef _ASM_MICROBLAZE_CACHEFLUSH_H
  16#define _ASM_MICROBLAZE_CACHEFLUSH_H
  17
  18/* Somebody depends on this; sigh... */
  19#include <linux/mm.h>
  20#include <linux/io.h>
  21
  22/* Look at Documentation/cachetlb.txt */
  23
  24/*
  25 * Cache handling functions.
  26 * Microblaze has a write-through data cache, meaning that the data cache
  27 * never needs to be flushed.  The only flushing operations that are
  28 * implemented are to invalidate the instruction cache.  These are called
  29 * after loading a user application into memory, we must invalidate the
  30 * instruction cache to make sure we don't fetch old, bad code.
  31 */
  32
  33/* struct cache, d=dcache, i=icache, fl = flush, iv = invalidate,
  34 * suffix r = range */
  35struct scache {
  36        /* icache */
  37        void (*ie)(void); /* enable */
  38        void (*id)(void); /* disable */
  39        void (*ifl)(void); /* flush */
  40        void (*iflr)(unsigned long a, unsigned long b);
  41        void (*iin)(void); /* invalidate */
  42        void (*iinr)(unsigned long a, unsigned long b);
  43        /* dcache */
  44        void (*de)(void); /* enable */
  45        void (*dd)(void); /* disable */
  46        void (*dfl)(void); /* flush */
  47        void (*dflr)(unsigned long a, unsigned long b);
  48        void (*din)(void); /* invalidate */
  49        void (*dinr)(unsigned long a, unsigned long b);
  50};
  51
  52/* microblaze cache */
  53extern struct scache *mbc;
  54
  55void microblaze_cache_init(void);
  56
  57#define enable_icache()                                 mbc->ie();
  58#define disable_icache()                                mbc->id();
  59#define flush_icache()                                  mbc->ifl();
  60#define flush_icache_range(start, end)                  mbc->iflr(start, end);
  61#define invalidate_icache()                             mbc->iin();
  62#define invalidate_icache_range(start, end)             mbc->iinr(start, end);
  63
  64#define flush_icache_user_range(vma, pg, adr, len)      flush_icache();
  65#define flush_icache_page(vma, pg)                      do { } while (0)
  66
  67#define enable_dcache()                                 mbc->de();
  68#define disable_dcache()                                mbc->dd();
  69/* FIXME for LL-temac driver */
  70#define invalidate_dcache()                             mbc->din();
  71#define invalidate_dcache_range(start, end)             mbc->dinr(start, end);
  72#define flush_dcache()                                  mbc->dfl();
  73#define flush_dcache_range(start, end)                  mbc->dflr(start, end);
  74
  75#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
  76/* MS: We have to implement it because of rootfs-jffs2 issue on WB */
  77#define flush_dcache_page(page) \
  78do { \
  79        unsigned long addr = (unsigned long) page_address(page); /* virtual */ \
  80        addr = (u32)virt_to_phys((void *)addr); \
  81        flush_dcache_range((unsigned) (addr), (unsigned) (addr) + PAGE_SIZE); \
  82} while (0);
  83
  84#define flush_dcache_mmap_lock(mapping)         do { } while (0)
  85#define flush_dcache_mmap_unlock(mapping)       do { } while (0)
  86
  87#define flush_cache_dup_mm(mm)                          do { } while (0)
  88#define flush_cache_vmap(start, end)                    do { } while (0)
  89#define flush_cache_vunmap(start, end)                  do { } while (0)
  90#define flush_cache_mm(mm)                      do { } while (0)
  91
  92#define flush_cache_page(vma, vmaddr, pfn) \
  93        flush_dcache_range(pfn << PAGE_SHIFT, (pfn << PAGE_SHIFT) + PAGE_SIZE);
  94
  95/* MS: kgdb code use this macro, wrong len with FLASH */
  96#if 0
  97#define flush_cache_range(vma, start, len)      {       \
  98        flush_icache_range((unsigned) (start), (unsigned) (start) + (len)); \
  99        flush_dcache_range((unsigned) (start), (unsigned) (start) + (len)); \
 100}
 101#endif
 102
 103#define flush_cache_range(vma, start, len) do { } while (0)
 104
 105static inline void copy_to_user_page(struct vm_area_struct *vma,
 106                                     struct page *page, unsigned long vaddr,
 107                                     void *dst, void *src, int len)
 108{
 109        u32 addr = virt_to_phys(dst);
 110        memcpy(dst, src, len);
 111        if (vma->vm_flags & VM_EXEC) {
 112                invalidate_icache_range(addr, addr + PAGE_SIZE);
 113                flush_dcache_range(addr, addr + PAGE_SIZE);
 114        }
 115}
 116
 117static inline void copy_from_user_page(struct vm_area_struct *vma,
 118                                       struct page *page, unsigned long vaddr,
 119                                       void *dst, void *src, int len)
 120{
 121        memcpy(dst, src, len);
 122}
 123
 124#endif /* _ASM_MICROBLAZE_CACHEFLUSH_H */
 125