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