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cache-sh2.c

/*
 * arch/sh/mm/cache-sh2.c
 *
 * Copyright (C) 2002 Paul Mundt
 * Copyright (C) 2008 Yoshinori Sato
 *
 * Released under the terms of the GNU GPL v2.0.
 */

#include <linux/init.h>
#include <linux/mm.h>

#include <asm/cache.h>
#include <asm/addrspace.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/io.h>

void __flush_wback_region(void *start, int size)
{
      unsigned long v;
      unsigned long begin, end;

      begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
      end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
            & ~(L1_CACHE_BYTES-1);
      for (v = begin; v < end; v+=L1_CACHE_BYTES) {
            unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0);
            int way;
            for (way = 0; way < 4; way++) {
                  unsigned long data =  ctrl_inl(addr | (way << 12));
                  if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
                        data &= ~SH_CACHE_UPDATED;
                        ctrl_outl(data, addr | (way << 12));
                  }
            }
      }
}

void __flush_purge_region(void *start, int size)
{
      unsigned long v;
      unsigned long begin, end;

      begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
      end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
            & ~(L1_CACHE_BYTES-1);

      for (v = begin; v < end; v+=L1_CACHE_BYTES)
            ctrl_outl((v & CACHE_PHYSADDR_MASK),
                    CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
}

void __flush_invalidate_region(void *start, int size)
{
#ifdef CONFIG_CACHE_WRITEBACK
      /*
       * SH-2 does not support individual line invalidation, only a
       * global invalidate.
       */
      unsigned long ccr;
      unsigned long flags;
      local_irq_save(flags);
      jump_to_uncached();

      ccr = ctrl_inl(CCR);
      ccr |= CCR_CACHE_INVALIDATE;
      ctrl_outl(ccr, CCR);

      back_to_cached();
      local_irq_restore(flags);
#else
      unsigned long v;
      unsigned long begin, end;

      begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
      end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
            & ~(L1_CACHE_BYTES-1);

      for (v = begin; v < end; v+=L1_CACHE_BYTES)
            ctrl_outl((v & CACHE_PHYSADDR_MASK),
                    CACHE_OC_ADDRESS_ARRAY | (v & 0x00000ff0) | 0x00000008);
#endif
}

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