arch/sh/mm/cache-sh2a.c

   1 /*
   2  * arch/sh/mm/cache-sh2a.c
   3  *
   4  * Copyright (C) 2008 Yoshinori Sato
   5  *
   6  * Released under the terms of the GNU GPL v2.0.
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/mm.h>
  11
  12 #include <asm/cache.h>
  13 #include <asm/addrspace.h>
  14 #include <asm/processor.h>
  15 #include <asm/cacheflush.h>
  16 #include <asm/io.h>
  17
  18 void __flush_wback_region(void *start, int size)
  19 {
  20         unsigned long v;
  21         unsigned long begin, end;
  22         unsigned long flags;
  23
  24         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
  25         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
  26                 & ~(L1_CACHE_BYTES-1);
  27
  28         local_irq_save(flags);
  29         jump_to_uncached();
  30
  31         for (v = begin; v < end; v+=L1_CACHE_BYTES) {
  32                 unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0);
  33                 int way;
  34                 for (way = 0; way < 4; way++) {
  35                         unsigned long data =  ctrl_inl(addr | (way << 11));
  36                         if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
  37                                 data &= ~SH_CACHE_UPDATED;
  38                                 ctrl_outl(data, addr | (way << 11));
  39                         }
  40                 }
  41         }
  42
  43         back_to_cached();
  44         local_irq_restore(flags);
  45 }
  46
  47 void __flush_purge_region(void *start, int size)
  48 {
  49         unsigned long v;
  50         unsigned long begin, end;
  51         unsigned long flags;
  52
  53         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
  54         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
  55                 & ~(L1_CACHE_BYTES-1);
  56
  57         local_irq_save(flags);
  58         jump_to_uncached();
  59
  60         for (v = begin; v < end; v+=L1_CACHE_BYTES) {
  61                 ctrl_outl((v & CACHE_PHYSADDR_MASK),
  62                           CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);
  63         }
  64         back_to_cached();
  65         local_irq_restore(flags);
  66 }
  67
  68 void __flush_invalidate_region(void *start, int size)
  69 {
  70         unsigned long v;
  71         unsigned long begin, end;
  72         unsigned long flags;
  73
  74         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
  75         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
  76                 & ~(L1_CACHE_BYTES-1);
  77         local_irq_save(flags);
  78         jump_to_uncached();
  79
  80 #ifdef CONFIG_CACHE_WRITEBACK
  81         ctrl_outl(ctrl_inl(CCR) | CCR_OCACHE_INVALIDATE, CCR);
  82         /* I-cache invalidate */
  83         for (v = begin; v < end; v+=L1_CACHE_BYTES) {
  84                 ctrl_outl((v & CACHE_PHYSADDR_MASK),
  85                           CACHE_IC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);
  86         }
  87 #else
  88         for (v = begin; v < end; v+=L1_CACHE_BYTES) {
  89                 ctrl_outl((v & CACHE_PHYSADDR_MASK),
  90                           CACHE_IC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);
  91                 ctrl_outl((v & CACHE_PHYSADDR_MASK),
  92                           CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);
  93         }
  94 #endif
  95         back_to_cached();
  96         local_irq_restore(flags);
  97 }
  98
  99 /* WBack O-Cache and flush I-Cache */
 100 void flush_icache_range(unsigned long start, unsigned long end)
 101 {
 102         unsigned long v;
 103         unsigned long flags;
 104
 105         start = start & ~(L1_CACHE_BYTES-1);
 106         end = (end + L1_CACHE_BYTES-1) & ~(L1_CACHE_BYTES-1);
 107
 108         local_irq_save(flags);
 109         jump_to_uncached();
 110
 111         for (v = start; v < end; v+=L1_CACHE_BYTES) {
 112                 unsigned long addr = (v & 0x000007f0);
 113                 int way;
 114                 /* O-Cache writeback */
 115                 for (way = 0; way < 4; way++) {
 116                         unsigned long data =  ctrl_inl(CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));
 117                         if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
 118                                 data &= ~SH_CACHE_UPDATED;
 119                                 ctrl_outl(data, CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));
 120                         }
 121                 }
 122                 /* I-Cache invalidate */
 123                 ctrl_outl(addr,
 124                           CACHE_IC_ADDRESS_ARRAY | addr | 0x00000008);
 125         }
 126
 127         back_to_cached();
 128         local_irq_restore(flags);
 129 }