arch/sh/kernel/cpu/sh4/probe.c

   1 /*
   2  * arch/sh/kernel/cpu/sh4/probe.c
   3  *
   4  * CPU Subtype Probing for SH-4.
   5  *
   6  * Copyright (C) 2001 - 2007  Paul Mundt
   7  * Copyright (C) 2003  Richard Curnow
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file "COPYING" in the main directory of this archive
  11  * for more details.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <asm/processor.h>
  16 #include <asm/cache.h>
  17
  18 int __init detect_cpu_and_cache_system(void)
  19 {
  20         unsigned long pvr, prr, cvr;
  21         unsigned long size;
  22
  23         static unsigned long sizes[16] = {
  24                 [1] = (1 << 12),
  25                 [2] = (1 << 13),
  26                 [4] = (1 << 14),
  27                 [8] = (1 << 15),
  28                 [9] = (1 << 16)
  29         };
  30
  31         pvr = (ctrl_inl(CCN_PVR) >> 8) & 0xffffff;
  32         prr = (ctrl_inl(CCN_PRR) >> 4) & 0xff;
  33         cvr = (ctrl_inl(CCN_CVR));
  34
  35         /*
  36          * Setup some sane SH-4 defaults for the icache
  37          */
  38         boot_cpu_data.icache.way_incr           = (1 << 13);
  39         boot_cpu_data.icache.entry_shift        = 5;
  40         boot_cpu_data.icache.sets               = 256;
  41         boot_cpu_data.icache.ways               = 1;
  42         boot_cpu_data.icache.linesz             = L1_CACHE_BYTES;
  43
  44         /*
  45          * And again for the dcache ..
  46          */
  47         boot_cpu_data.dcache.way_incr           = (1 << 14);
  48         boot_cpu_data.dcache.entry_shift        = 5;
  49         boot_cpu_data.dcache.sets               = 512;
  50         boot_cpu_data.dcache.ways               = 1;
  51         boot_cpu_data.dcache.linesz             = L1_CACHE_BYTES;
  52
  53         /*
  54          * Setup some generic flags we can probe on SH-4A parts
  55          */
  56         if (((pvr >> 16) & 0xff) == 0x10) {
  57                 if ((cvr & 0x10000000) == 0)
  58                         boot_cpu_data.flags |= CPU_HAS_DSP;
  59
  60                 boot_cpu_data.flags |= CPU_HAS_LLSC;
  61         }
  62
  63         /* FPU detection works for everyone */
  64         if ((cvr & 0x20000000) == 1)
  65                 boot_cpu_data.flags |= CPU_HAS_FPU;
  66
  67         /* Mask off the upper chip ID */
  68         pvr &= 0xffff;
  69
  70         /*
  71          * Probe the underlying processor version/revision and
  72          * adjust cpu_data setup accordingly.
  73          */
  74         switch (pvr) {
  75         case 0x205:
  76                 boot_cpu_data.type = CPU_SH7750;
  77                 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
  78                                    CPU_HAS_PERF_COUNTER;
  79                 break;
  80         case 0x206:
  81                 boot_cpu_data.type = CPU_SH7750S;
  82                 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
  83                                    CPU_HAS_PERF_COUNTER;
  84                 break;
  85         case 0x1100:
  86                 boot_cpu_data.type = CPU_SH7751;
  87                 boot_cpu_data.flags |= CPU_HAS_FPU;
  88                 break;
  89         case 0x2001:
  90         case 0x2004:
  91                 boot_cpu_data.type = CPU_SH7770;
  92                 boot_cpu_data.icache.ways = 4;
  93                 boot_cpu_data.dcache.ways = 4;
  94
  95                 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_LLSC;
  96                 break;
  97         case 0x2006:
  98         case 0x200A:
  99                 if (prr == 0x61)
 100                         boot_cpu_data.type = CPU_SH7781;
 101                 else
 102                         boot_cpu_data.type = CPU_SH7780;
 103
 104                 boot_cpu_data.icache.ways = 4;
 105                 boot_cpu_data.dcache.ways = 4;
 106
 107                 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
 108                                    CPU_HAS_LLSC;
 109                 break;
 110         case 0x3000:
 111         case 0x3003:
 112         case 0x3009:
 113                 boot_cpu_data.type = CPU_SH7343;
 114                 boot_cpu_data.icache.ways = 4;
 115                 boot_cpu_data.dcache.ways = 4;
 116                 boot_cpu_data.flags |= CPU_HAS_LLSC;
 117                 break;
 118         case 0x3004:
 119         case 0x3007:
 120                 boot_cpu_data.type = CPU_SH7785;
 121                 boot_cpu_data.icache.ways = 4;
 122                 boot_cpu_data.dcache.ways = 4;
 123                 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
 124                                           CPU_HAS_LLSC;
 125                 break;
 126         case 0x3008:
 127                 if (prr == 0xa0) {
 128                         boot_cpu_data.type = CPU_SH7722;
 129                         boot_cpu_data.icache.ways = 4;
 130                         boot_cpu_data.dcache.ways = 4;
 131                         boot_cpu_data.flags |= CPU_HAS_LLSC;
 132                 }
 133                 break;
 134         case 0x4000:    /* 1st cut */
 135         case 0x4001:    /* 2nd cut */
 136                 boot_cpu_data.type = CPU_SHX3;
 137                 boot_cpu_data.icache.ways = 4;
 138                 boot_cpu_data.dcache.ways = 4;
 139                 boot_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
 140                                           CPU_HAS_LLSC;
 141                 break;
 142         case 0x700:
 143                 boot_cpu_data.type = CPU_SH4_501;
 144                 boot_cpu_data.icache.ways = 2;
 145                 boot_cpu_data.dcache.ways = 2;
 146                 break;
 147         case 0x600:
 148                 boot_cpu_data.type = CPU_SH4_202;
 149                 boot_cpu_data.icache.ways = 2;
 150                 boot_cpu_data.dcache.ways = 2;
 151                 boot_cpu_data.flags |= CPU_HAS_FPU;
 152                 break;
 153         case 0x500 ... 0x501:
 154                 switch (prr) {
 155                 case 0x10:
 156                         boot_cpu_data.type = CPU_SH7750R;
 157                         break;
 158                 case 0x11:
 159                         boot_cpu_data.type = CPU_SH7751R;
 160                         break;
 161                 case 0x50 ... 0x5f:
 162                         boot_cpu_data.type = CPU_SH7760;
 163                         break;
 164                 }
 165
 166                 boot_cpu_data.icache.ways = 2;
 167                 boot_cpu_data.dcache.ways = 2;
 168
 169                 boot_cpu_data.flags |= CPU_HAS_FPU;
 170
 171                 break;
 172         default:
 173                 boot_cpu_data.type = CPU_SH_NONE;
 174                 break;
 175         }
 176
 177 #ifdef CONFIG_SH_DIRECT_MAPPED
 178         boot_cpu_data.icache.ways = 1;
 179         boot_cpu_data.dcache.ways = 1;
 180 #endif
 181
 182 #ifdef CONFIG_CPU_HAS_PTEA
 183         boot_cpu_data.flags |= CPU_HAS_PTEA;
 184 #endif
 185
 186         /*
 187          * On anything that's not a direct-mapped cache, look to the CVR
 188          * for I/D-cache specifics.
 189          */
 190         if (boot_cpu_data.icache.ways > 1) {
 191                 size = sizes[(cvr >> 20) & 0xf];
 192                 boot_cpu_data.icache.way_incr   = (size >> 1);
 193                 boot_cpu_data.icache.sets       = (size >> 6);
 194
 195         }
 196
 197         /* And the rest of the D-cache */
 198         if (boot_cpu_data.dcache.ways > 1) {
 199                 size = sizes[(cvr >> 16) & 0xf];
 200                 boot_cpu_data.dcache.way_incr   = (size >> 1);
 201                 boot_cpu_data.dcache.sets       = (size >> 6);
 202         }
 203
 204         /*
 205          * Setup the L2 cache desc
 206          *
 207          * SH-4A's have an optional PIPT L2.
 208          */
 209         if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
 210                 /*
 211                  * Size calculation is much more sensible
 212                  * than it is for the L1.
 213                  *
 214                  * Sizes are 128KB, 258KB, 512KB, and 1MB.
 215                  */
 216                 size = (cvr & 0xf) << 17;
 217
 218                 BUG_ON(!size);
 219
 220                 boot_cpu_data.scache.way_incr           = (1 << 16);
 221                 boot_cpu_data.scache.entry_shift        = 5;
 222                 boot_cpu_data.scache.ways               = 4;
 223                 boot_cpu_data.scache.linesz             = L1_CACHE_BYTES;
 224
 225                 boot_cpu_data.scache.entry_mask =
 226                         (boot_cpu_data.scache.way_incr -
 227                          boot_cpu_data.scache.linesz);
 228
 229                 boot_cpu_data.scache.sets       = size /
 230                         (boot_cpu_data.scache.linesz *
 231                          boot_cpu_data.scache.ways);
 232
 233                 boot_cpu_data.scache.way_size   =
 234                         (boot_cpu_data.scache.sets *
 235                          boot_cpu_data.scache.linesz);
 236         }
 237
 238         return 0;
 239 }