arch/sh/mm/cache-sh3.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/sh/mm/cache-sh3.c
   4  *
   5  * Copyright (C) 1999, 2000  Niibe Yutaka
   6  * Copyright (C) 2002 Paul Mundt
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/mman.h>
  11 #include <linux/mm.h>
  12 #include <linux/threads.h>
  13 #include <asm/addrspace.h>
  14 #include <asm/page.h>
  15 #include <asm/pgtable.h>
  16 #include <asm/processor.h>
  17 #include <asm/cache.h>
  18 #include <asm/io.h>
  19 #include <linux/uaccess.h>
  20 #include <asm/pgalloc.h>
  21 #include <asm/mmu_context.h>
  22 #include <asm/cacheflush.h>
  23
  24 /*
  25  * Write back the dirty D-caches, but not invalidate them.
  26  *
  27  * Is this really worth it, or should we just alias this routine
  28  * to __flush_purge_region too?
  29  *
  30  * START: Virtual Address (U0, P1, or P3)
  31  * SIZE: Size of the region.
  32  */
  33
  34 static void sh3__flush_wback_region(void *start, int size)
  35 {
  36         unsigned long v, j;
  37         unsigned long begin, end;
  38         unsigned long flags;
  39
  40         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
  41         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
  42                 & ~(L1_CACHE_BYTES-1);
  43
  44         for (v = begin; v < end; v+=L1_CACHE_BYTES) {
  45                 unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY;
  46                 for (j = 0; j < current_cpu_data.dcache.ways; j++) {
  47                         unsigned long data, addr, p;
  48
  49                         p = __pa(v);
  50                         addr = addrstart | (v & current_cpu_data.dcache.entry_mask);
  51                         local_irq_save(flags);
  52                         data = __raw_readl(addr);
  53
  54                         if ((data & CACHE_PHYSADDR_MASK) ==
  55                             (p & CACHE_PHYSADDR_MASK)) {
  56                                 data &= ~SH_CACHE_UPDATED;
  57                                 __raw_writel(data, addr);
  58                                 local_irq_restore(flags);
  59                                 break;
  60                         }
  61                         local_irq_restore(flags);
  62                         addrstart += current_cpu_data.dcache.way_incr;
  63                 }
  64         }
  65 }
  66
  67 /*
  68  * Write back the dirty D-caches and invalidate them.
  69  *
  70  * START: Virtual Address (U0, P1, or P3)
  71  * SIZE: Size of the region.
  72  */
  73 static void sh3__flush_purge_region(void *start, int size)
  74 {
  75         unsigned long v;
  76         unsigned long begin, end;
  77
  78         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
  79         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
  80                 & ~(L1_CACHE_BYTES-1);
  81
  82         for (v = begin; v < end; v+=L1_CACHE_BYTES) {
  83                 unsigned long data, addr;
  84
  85                 data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */
  86                 addr = CACHE_OC_ADDRESS_ARRAY |
  87                         (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC;
  88                 __raw_writel(data, addr);
  89         }
  90 }
  91
  92 void __init sh3_cache_init(void)
  93 {
  94         __flush_wback_region = sh3__flush_wback_region;
  95         __flush_purge_region = sh3__flush_purge_region;
  96
  97         /*
  98          * No write back please
  99          *
 100          * Except I don't think there's any way to avoid the writeback.
 101          * So we just alias it to sh3__flush_purge_region(). dwmw2.
 102          */
 103         __flush_invalidate_region = sh3__flush_purge_region;
 104 }