arch/sh/mm/cache-sh3.c

   1 /*
   2  * arch/sh/mm/cache-sh3.c
   3  *
   4  * Copyright (C) 1999, 2000  Niibe Yutaka
   5  * Copyright (C) 2002 Paul Mundt
   6  *
   7  * Released under the terms of the GNU GPL v2.0.
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/mman.h>
  12 #include <linux/mm.h>
  13 #include <linux/threads.h>
  14 #include <asm/addrspace.h>
  15 #include <asm/page.h>
  16 #include <asm/pgtable.h>
  17 #include <asm/processor.h>
  18 #include <asm/cache.h>
  19 #include <asm/io.h>
  20 #include <asm/uaccess.h>
  21 #include <asm/pgalloc.h>
  22 #include <asm/mmu_context.h>
  23 #include <asm/cacheflush.h>
  24
  25 /*
  26  * Write back the dirty D-caches, but not invalidate them.
  27  *
  28  * Is this really worth it, or should we just alias this routine
  29  * to __flush_purge_region too?
  30  *
  31  * START: Virtual Address (U0, P1, or P3)
  32  * SIZE: Size of the region.
  33  */
  34
  35 static void sh3__flush_wback_region(void *start, int size)
  36 {
  37         unsigned long v, j;
  38         unsigned long begin, end;
  39         unsigned long flags;
  40
  41         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
  42         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
  43                 & ~(L1_CACHE_BYTES-1);
  44
  45         for (v = begin; v < end; v+=L1_CACHE_BYTES) {
  46                 unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
  47                 for (j = 0; j < current_cpu_data.dcache.ways; j++) {
  48                         unsigned long data, addr, p;
  49
  50                         p = __pa(v);
  51                         addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
  52                         local_irq_save(flags);
  53                         data = __raw_readl(addr);
  54
  55                         if ((data & CACHE_PHYSADDR_MASK) ==
  56                             (p & CACHE_PHYSADDR_MASK)) {
  57                                 data &= ~SH_CACHE_UPDATED;
  58                                 __raw_writel(data, addr);
  59                                 local_irq_restore(flags);
  60                                 break;
  61                         }
  62                         local_irq_restore(flags);
  63                         addrstart += current_cpu_data.dcache.way_incr;
  64                 }
  65         }
  66 }
  67
  68 /*
  69  * Write back the dirty D-caches and invalidate them.
  70  *
  71  * START: Virtual Address (U0, P1, or P3)
  72  * SIZE: Size of the region.
  73  */
  74 static void sh3__flush_purge_region(void *start, int size)
  75 {
  76         unsigned long v;
  77         unsigned long begin, end;
  78
  79         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
  80         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
  81                 & ~(L1_CACHE_BYTES-1);
  82
  83         for (v = begin; v < end; v+=L1_CACHE_BYTES) {
  84                 unsigned long data, addr;
  85
  86                 data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
  87                 addr = CACHE_OC_ADDRESS_ARRAY |
  88                         (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
  89                 __raw_writel(data, addr);
  90         }
  91 }
  92
  93 void __init sh3_cache_init(void)
  94 {
  95         __flush_wback_region = sh3__flush_wback_region;
  96         __flush_purge_region = sh3__flush_purge_region;
  97
  98         /*
  99          * No write back please
 100          *
 101          * Except I don't think there's any way to avoid the writeback.
 102          * So we just alias it to sh3__flush_purge_region(). dwmw2.
 103          */
 104         __flush_invalidate_region = sh3__flush_purge_region;
 105 }