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cache-sh2a.c

/*
 * arch/sh/mm/cache-sh2a.c
 *
 * 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;
      unsigned long flags;

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

      local_irq_save(flags);
      jump_to_uncached();

      for (v = begin; v < end; v+=L1_CACHE_BYTES) {
            unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0);
            int way;
            for (way = 0; way < 4; way++) {
                  unsigned long data =  ctrl_inl(addr | (way << 11));
                  if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
                        data &= ~SH_CACHE_UPDATED;
                        ctrl_outl(data, addr | (way << 11));
                  }
            }
      }

      back_to_cached();
      local_irq_restore(flags);
}

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

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

      local_irq_save(flags);
      jump_to_uncached();

      for (v = begin; v < end; v+=L1_CACHE_BYTES) {
            ctrl_outl((v & CACHE_PHYSADDR_MASK),
                    CACHE_OC_ADDRESS_ARRAY | (v & 0x000003f0) | 0x00000008);
      }
      back_to_cached();
      local_irq_restore(flags);
}

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

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

#ifdef CONFIG_CACHE_WRITEBACK
      ctrl_outl(ctrl_inl(CCR) | CCR_OCACHE_INVALIDATE, CCR);
      /* I-cache invalidate */
      for (v = begin; v < end; v+=L1_CACHE_BYTES) {
            ctrl_outl((v & CACHE_PHYSADDR_MASK),
                    CACHE_IC_ADDRESS_ARRAY | (v & 0x000003f0) | 0x00000008);
      }
#else
      for (v = begin; v < end; v+=L1_CACHE_BYTES) {
            ctrl_outl((v & CACHE_PHYSADDR_MASK),
                    CACHE_IC_ADDRESS_ARRAY | (v & 0x000003f0) | 0x00000008);
            ctrl_outl((v & CACHE_PHYSADDR_MASK),
                    CACHE_OC_ADDRESS_ARRAY | (v & 0x000003f0) | 0x00000008);
      }
#endif
      back_to_cached();
      local_irq_restore(flags);
}

/* WBack O-Cache and flush I-Cache */
void flush_icache_range(unsigned long start, unsigned long end)
{
      unsigned long v;
      unsigned long flags;

      start = start & ~(L1_CACHE_BYTES-1);
      end = (end + L1_CACHE_BYTES-1) & ~(L1_CACHE_BYTES-1);

      local_irq_save(flags);
      jump_to_uncached();

      for (v = start; v < end; v+=L1_CACHE_BYTES) {
            unsigned long addr = (v & 0x000007f0);
            int way;
            /* O-Cache writeback */
            for (way = 0; way < 4; way++) {
                  unsigned long data =  ctrl_inl(CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));
                  if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
                        data &= ~SH_CACHE_UPDATED;
                        ctrl_outl(data, CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));
                  }
            }
            /* I-Cache invalidate */
            ctrl_outl(addr,
                    CACHE_IC_ADDRESS_ARRAY | addr | 0x00000008);
      }

      back_to_cached();
      local_irq_restore(flags);
}

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