LXR linux/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
  35static 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 */
  74static 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
  93void __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}
 106