arch/sh/mm/cache-sh2a.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/sh/mm/cache-sh2a.c
   4  *
   5  * Copyright (C) 2008 Yoshinori Sato
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/mm.h>
  10
  11 #include <asm/cache.h>
  12 #include <asm/addrspace.h>
  13 #include <asm/processor.h>
  14 #include <asm/cacheflush.h>
  15 #include <asm/io.h>
  16
  17 /*
  18  * The maximum number of pages we support up to when doing ranged dcache
  19  * flushing. Anything exceeding this will simply flush the dcache in its
  20  * entirety.
  21  */
  22 #define MAX_OCACHE_PAGES        32
  23 #define MAX_ICACHE_PAGES        32
  24
  25 #ifdef CONFIG_CACHE_WRITEBACK
  26 static void sh2a_flush_oc_line(unsigned long v, int way)
  27 {
  28         unsigned long addr = (v & 0x000007f0) | (way << 11);
  29         unsigned long data;
  30
  31         data = __raw_readl(CACHE_OC_ADDRESS_ARRAY | addr);
  32         if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
  33                 data &= ~SH_CACHE_UPDATED;
  34                 __raw_writel(data, CACHE_OC_ADDRESS_ARRAY | addr);
  35         }
  36 }
  37 #endif
  38
  39 static void sh2a_invalidate_line(unsigned long cache_addr, unsigned long v)
  40 {
  41         /* Set associative bit to hit all ways */
  42         unsigned long addr = (v & 0x000007f0) | SH_CACHE_ASSOC;
  43         __raw_writel((addr & CACHE_PHYSADDR_MASK), cache_addr | addr);
  44 }
  45
  46 /*
  47  * Write back the dirty D-caches, but not invalidate them.
  48  */
  49 static void sh2a__flush_wback_region(void *start, int size)
  50 {
  51 #ifdef CONFIG_CACHE_WRITEBACK
  52         unsigned long v;
  53         unsigned long begin, end;
  54         unsigned long flags;
  55         int nr_ways;
  56
  57         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
  58         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
  59                 & ~(L1_CACHE_BYTES-1);
  60         nr_ways = current_cpu_data.dcache.ways;
  61
  62         local_irq_save(flags);
  63         jump_to_uncached();
  64
  65         /* If there are too many pages then flush the entire cache */
  66         if (((end - begin) >> PAGE_SHIFT) >= MAX_OCACHE_PAGES) {
  67                 begin = CACHE_OC_ADDRESS_ARRAY;
  68                 end = begin + (nr_ways * current_cpu_data.dcache.way_size);
  69
  70                 for (v = begin; v < end; v += L1_CACHE_BYTES) {
  71                         unsigned long data = __raw_readl(v);
  72                         if (data & SH_CACHE_UPDATED)
  73                                 __raw_writel(data & ~SH_CACHE_UPDATED, v);
  74                 }
  75         } else {
  76                 int way;
  77                 for (way = 0; way < nr_ways; way++) {
  78                         for (v = begin; v < end; v += L1_CACHE_BYTES)
  79                                 sh2a_flush_oc_line(v, way);
  80                 }
  81         }
  82
  83         back_to_cached();
  84         local_irq_restore(flags);
  85 #endif
  86 }
  87
  88 /*
  89  * Write back the dirty D-caches and invalidate them.
  90  */
  91 static void sh2a__flush_purge_region(void *start, int size)
  92 {
  93         unsigned long v;
  94         unsigned long begin, end;
  95         unsigned long flags;
  96
  97         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
  98         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
  99                 & ~(L1_CACHE_BYTES-1);
 100
 101         local_irq_save(flags);
 102         jump_to_uncached();
 103
 104         for (v = begin; v < end; v+=L1_CACHE_BYTES) {
 105 #ifdef CONFIG_CACHE_WRITEBACK
 106                 int way;
 107                 int nr_ways = current_cpu_data.dcache.ways;
 108                 for (way = 0; way < nr_ways; way++)
 109                         sh2a_flush_oc_line(v, way);
 110 #endif
 111                 sh2a_invalidate_line(CACHE_OC_ADDRESS_ARRAY, v);
 112         }
 113
 114         back_to_cached();
 115         local_irq_restore(flags);
 116 }
 117
 118 /*
 119  * Invalidate the D-caches, but no write back please
 120  */
 121 static void sh2a__flush_invalidate_region(void *start, int size)
 122 {
 123         unsigned long v;
 124         unsigned long begin, end;
 125         unsigned long flags;
 126
 127         begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
 128         end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
 129                 & ~(L1_CACHE_BYTES-1);
 130
 131         local_irq_save(flags);
 132         jump_to_uncached();
 133
 134         /* If there are too many pages then just blow the cache */
 135         if (((end - begin) >> PAGE_SHIFT) >= MAX_OCACHE_PAGES) {
 136                 __raw_writel(__raw_readl(SH_CCR) | CCR_OCACHE_INVALIDATE,
 137                              SH_CCR);
 138         } else {
 139                 for (v = begin; v < end; v += L1_CACHE_BYTES)
 140                         sh2a_invalidate_line(CACHE_OC_ADDRESS_ARRAY, v);
 141         }
 142
 143         back_to_cached();
 144         local_irq_restore(flags);
 145 }
 146
 147 /*
 148  * Write back the range of D-cache, and purge the I-cache.
 149  */
 150 static void sh2a_flush_icache_range(void *args)
 151 {
 152         struct flusher_data *data = args;
 153         unsigned long start, end;
 154         unsigned long v;
 155         unsigned long flags;
 156
 157         start = data->addr1 & ~(L1_CACHE_BYTES-1);
 158         end = (data->addr2 + L1_CACHE_BYTES-1) & ~(L1_CACHE_BYTES-1);
 159
 160 #ifdef CONFIG_CACHE_WRITEBACK
 161         sh2a__flush_wback_region((void *)start, end-start);
 162 #endif
 163
 164         local_irq_save(flags);
 165         jump_to_uncached();
 166
 167         /* I-Cache invalidate */
 168         /* If there are too many pages then just blow the cache */
 169         if (((end - start) >> PAGE_SHIFT) >= MAX_ICACHE_PAGES) {
 170                 __raw_writel(__raw_readl(SH_CCR) | CCR_ICACHE_INVALIDATE,
 171                              SH_CCR);
 172         } else {
 173                 for (v = start; v < end; v += L1_CACHE_BYTES)
 174                         sh2a_invalidate_line(CACHE_IC_ADDRESS_ARRAY, v);
 175         }
 176
 177         back_to_cached();
 178         local_irq_restore(flags);
 179 }
 180
 181 void __init sh2a_cache_init(void)
 182 {
 183         local_flush_icache_range        = sh2a_flush_icache_range;
 184
 185         __flush_wback_region            = sh2a__flush_wback_region;
 186         __flush_purge_region            = sh2a__flush_purge_region;
 187         __flush_invalidate_region       = sh2a__flush_invalidate_region;
 188 }