arch/microblaze/kernel/cpu/cache.c

   1 /*
   2  * Cache control for MicroBlaze cache memories
   3  *
   4  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   5  * Copyright (C) 2007-2009 PetaLogix
   6  * Copyright (C) 2007 John Williams <john.williams@petalogix.com>
   7  *
   8  * This file is subject to the terms and conditions of the GNU General
   9  * Public License. See the file COPYING in the main directory of this
  10  * archive for more details.
  11  */
  12
  13 #include <asm/cacheflush.h>
  14 #include <linux/cache.h>
  15 #include <asm/cpuinfo.h>
  16
  17 /* Exported functions */
  18
  19 void _enable_icache(void)
  20 {
  21         if (cpuinfo.use_icache) {
  22 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
  23                 __asm__ __volatile__ ("                                 \
  24                                 msrset  r0, %0;                         \
  25                                 nop; "                                  \
  26                                 :                                       \
  27                                 : "i" (MSR_ICE)                         \
  28                                 : "memory");
  29 #else
  30                 __asm__ __volatile__ ("                                 \
  31                                 mfs     r12, rmsr;                      \
  32                                 nop;                                    \
  33                                 ori     r12, r12, %0;                   \
  34                                 mts     rmsr, r12;                      \
  35                                 nop; "                                  \
  36                                 :                                       \
  37                                 : "i" (MSR_ICE)                         \
  38                                 : "memory", "r12");
  39 #endif
  40         }
  41 }
  42
  43 void _disable_icache(void)
  44 {
  45         if (cpuinfo.use_icache) {
  46 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
  47                 __asm__ __volatile__ ("                                 \
  48                                 msrclr r0, %0;                          \
  49                                 nop; "                                  \
  50                                 :                                       \
  51                                 : "i" (MSR_ICE)                         \
  52                                 : "memory");
  53 #else
  54                 __asm__ __volatile__ ("                                 \
  55                                 mfs     r12, rmsr;                      \
  56                                 nop;                                    \
  57                                 andi    r12, r12, ~%0;                  \
  58                                 mts     rmsr, r12;                      \
  59                                 nop; "                                  \
  60                                 :                                       \
  61                                 : "i" (MSR_ICE)                         \
  62                                 : "memory", "r12");
  63 #endif
  64         }
  65 }
  66
  67 void _invalidate_icache(unsigned int addr)
  68 {
  69         if (cpuinfo.use_icache) {
  70                 __asm__ __volatile__ ("                                 \
  71                                 wic     %0, r0"                         \
  72                                 :                                       \
  73                                 : "r" (addr));
  74         }
  75 }
  76
  77 void _enable_dcache(void)
  78 {
  79         if (cpuinfo.use_dcache) {
  80 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
  81                 __asm__ __volatile__ ("                                 \
  82                                 msrset  r0, %0;                         \
  83                                 nop; "                                  \
  84                                 :                                       \
  85                                 : "i" (MSR_DCE)                         \
  86                                 : "memory");
  87 #else
  88                 __asm__ __volatile__ ("                                 \
  89                                 mfs     r12, rmsr;                      \
  90                                 nop;                                    \
  91                                 ori     r12, r12, %0;                   \
  92                                 mts     rmsr, r12;                      \
  93                                 nop; "                                  \
  94                                 :                                       \
  95                                 : "i" (MSR_DCE)                 \
  96                                 : "memory", "r12");
  97 #endif
  98         }
  99 }
 100
 101 void _disable_dcache(void)
 102 {
 103 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR
 104                 __asm__ __volatile__ ("                                 \
 105                                 msrclr  r0, %0;                         \
 106                                 nop; "                                  \
 107                                 :                                       \
 108                                 : "i" (MSR_DCE)                 \
 109                                 : "memory");
 110 #else
 111                 __asm__ __volatile__ ("                                 \
 112                                 mfs     r12, rmsr;                      \
 113                                 nop;                                    \
 114                                 andi    r12, r12, ~%0;                  \
 115                                 mts     rmsr, r12;                      \
 116                                 nop; "                                  \
 117                                 :                                       \
 118                                 : "i" (MSR_DCE)                 \
 119                                 : "memory", "r12");
 120 #endif
 121 }
 122
 123 void _invalidate_dcache(unsigned int addr)
 124 {
 125                 __asm__ __volatile__ ("                                 \
 126                                 wdc     %0, r0"                         \
 127                                 :                                       \
 128                                 : "r" (addr));
 129 }
 130
 131 void __invalidate_icache_all(void)
 132 {
 133         unsigned int i;
 134         unsigned flags;
 135
 136         if (cpuinfo.use_icache) {
 137                 local_irq_save(flags);
 138                 __disable_icache();
 139
 140                 /* Just loop through cache size and invalidate, no need to add
 141                         CACHE_BASE address */
 142                 for (i = 0; i < cpuinfo.icache_size;
 143                         i += cpuinfo.icache_line)
 144                                 __invalidate_icache(i);
 145
 146                 __enable_icache();
 147                 local_irq_restore(flags);
 148         }
 149 }
 150
 151 void __invalidate_icache_range(unsigned long start, unsigned long end)
 152 {
 153         unsigned int i;
 154         unsigned flags;
 155         unsigned int align;
 156
 157         if (cpuinfo.use_icache) {
 158                 /*
 159                  * No need to cover entire cache range,
 160                  * just cover cache footprint
 161                  */
 162                 end = min(start + cpuinfo.icache_size, end);
 163                 align = ~(cpuinfo.icache_line - 1);
 164                 start &= align; /* Make sure we are aligned */
 165                 /* Push end up to the next cache line */
 166                 end = ((end & align) + cpuinfo.icache_line);
 167
 168                 local_irq_save(flags);
 169                 __disable_icache();
 170
 171                 for (i = start; i < end; i += cpuinfo.icache_line)
 172                         __invalidate_icache(i);
 173
 174                 __enable_icache();
 175                 local_irq_restore(flags);
 176         }
 177 }
 178
 179 void __invalidate_icache_page(struct vm_area_struct *vma, struct page *page)
 180 {
 181         __invalidate_icache_all();
 182 }
 183
 184 void __invalidate_icache_user_range(struct vm_area_struct *vma,
 185                                 struct page *page, unsigned long adr,
 186                                 int len)
 187 {
 188         __invalidate_icache_all();
 189 }
 190
 191 void __invalidate_cache_sigtramp(unsigned long addr)
 192 {
 193         __invalidate_icache_range(addr, addr + 8);
 194 }
 195
 196 void __invalidate_dcache_all(void)
 197 {
 198         unsigned int i;
 199         unsigned flags;
 200
 201         if (cpuinfo.use_dcache) {
 202                 local_irq_save(flags);
 203                 __disable_dcache();
 204
 205                 /*
 206                  * Just loop through cache size and invalidate,
 207                  * no need to add CACHE_BASE address
 208                  */
 209                 for (i = 0; i < cpuinfo.dcache_size;
 210                         i += cpuinfo.dcache_line)
 211                                 __invalidate_dcache(i);
 212
 213                 __enable_dcache();
 214                 local_irq_restore(flags);
 215         }
 216 }
 217
 218 void __invalidate_dcache_range(unsigned long start, unsigned long end)
 219 {
 220         unsigned int i;
 221         unsigned flags;
 222         unsigned int align;
 223
 224         if (cpuinfo.use_dcache) {
 225                 /*
 226                  * No need to cover entire cache range,
 227                  * just cover cache footprint
 228                  */
 229                 end = min(start + cpuinfo.dcache_size, end);
 230                 align = ~(cpuinfo.dcache_line - 1);
 231                 start &= align; /* Make sure we are aligned */
 232                 /* Push end up to the next cache line */
 233                 end = ((end & align) + cpuinfo.dcache_line);
 234                 local_irq_save(flags);
 235                 __disable_dcache();
 236
 237                 for (i = start; i < end; i += cpuinfo.dcache_line)
 238                         __invalidate_dcache(i);
 239
 240                 __enable_dcache();
 241                 local_irq_restore(flags);
 242         }
 243 }
 244
 245 void __invalidate_dcache_page(struct vm_area_struct *vma, struct page *page)
 246 {
 247         __invalidate_dcache_all();
 248 }
 249
 250 void __invalidate_dcache_user_range(struct vm_area_struct *vma,
 251                                 struct page *page, unsigned long adr,
 252                                 int len)
 253 {
 254         __invalidate_dcache_all();
 255 }