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