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 = (__raw_readl(CCN_PVR) >> 8) & 0xffffff;
  32         prr = (__raw_readl(CCN_PRR) >> 4) & 0xff;
  33         cvr = (__raw_readl(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         /* We don't know the chip cut */
  54         boot_cpu_data.cut_major = boot_cpu_data.cut_minor = -1;
  55
  56         /*
  57          * Setup some generic flags we can probe on SH-4A parts
  58          */
  59         if (((pvr >> 16) & 0xff) == 0x10) {
  60                 boot_cpu_data.family = CPU_FAMILY_SH4A;
  61
  62                 if ((cvr & 0x10000000) == 0) {
  63                         boot_cpu_data.flags |= CPU_HAS_DSP;
  64                         boot_cpu_data.family = CPU_FAMILY_SH4AL_DSP;
  65                 }
  66
  67                 boot_cpu_data.flags |= CPU_HAS_LLSC | CPU_HAS_PERF_COUNTER;
  68                 boot_cpu_data.cut_major = pvr & 0x7f;
  69
  70                 boot_cpu_data.icache.ways = 4;
  71                 boot_cpu_data.dcache.ways = 4;
  72         } else {
  73                 /* And some SH-4 defaults.. */
  74                 boot_cpu_data.flags |= CPU_HAS_PTEA | CPU_HAS_FPU;
  75                 boot_cpu_data.family = CPU_FAMILY_SH4;
  76         }
  77
  78         /* FPU detection works for almost everyone */
  79         if ((cvr & 0x20000000))
  80                 boot_cpu_data.flags |= CPU_HAS_FPU;
  81
  82         /* Mask off the upper chip ID */
  83         pvr &= 0xffff;
  84
  85         /*
  86          * Probe the underlying processor version/revision and
  87          * adjust cpu_data setup accordingly.
  88          */
  89         switch (pvr) {
  90         case 0x205:
  91                 boot_cpu_data.type = CPU_SH7750;
  92                 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG |
  93                                        CPU_HAS_PERF_COUNTER;
  94                 break;
  95         case 0x206:
  96                 boot_cpu_data.type = CPU_SH7750S;
  97                 boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG |
  98                                        CPU_HAS_PERF_COUNTER;
  99                 break;
 100         case 0x1100:
 101                 boot_cpu_data.type = CPU_SH7751;
 102                 break;
 103         case 0x2001:
 104         case 0x2004:
 105                 boot_cpu_data.type = CPU_SH7770;
 106                 break;
 107         case 0x2006:
 108         case 0x200A:
 109                 if (prr == 0x61)
 110                         boot_cpu_data.type = CPU_SH7781;
 111                 else if (prr == 0xa1)
 112                         boot_cpu_data.type = CPU_SH7763;
 113                 else
 114                         boot_cpu_data.type = CPU_SH7780;
 115
 116                 break;
 117         case 0x3000:
 118         case 0x3003:
 119         case 0x3009:
 120                 boot_cpu_data.type = CPU_SH7343;
 121                 break;
 122         case 0x3004:
 123         case 0x3007:
 124                 boot_cpu_data.type = CPU_SH7785;
 125                 break;
 126         case 0x4004:
 127         case 0x4005:
 128                 boot_cpu_data.type = CPU_SH7786;
 129                 boot_cpu_data.flags |= CPU_HAS_PTEAEX | CPU_HAS_L2_CACHE;
 130                 break;
 131         case 0x3008:
 132                 switch (prr) {
 133                 case 0x50:
 134                 case 0x51:
 135                         boot_cpu_data.type = CPU_SH7723;
 136                         boot_cpu_data.flags |= CPU_HAS_L2_CACHE;
 137                         break;
 138                 case 0x70:
 139                         boot_cpu_data.type = CPU_SH7366;
 140                         break;
 141                 case 0xa0:
 142                 case 0xa1:
 143                         boot_cpu_data.type = CPU_SH7722;
 144                         break;
 145                 }
 146                 break;
 147         case 0x300b:
 148                 switch (prr) {
 149                 case 0x20:
 150                         boot_cpu_data.type = CPU_SH7724;
 151                         boot_cpu_data.flags |= CPU_HAS_L2_CACHE;
 152                         break;
 153                 case 0x50:
 154                         boot_cpu_data.type = CPU_SH7757;
 155                         break;
 156                 }
 157                 break;
 158         case 0x4000:    /* 1st cut */
 159         case 0x4001:    /* 2nd cut */
 160                 boot_cpu_data.type = CPU_SHX3;
 161                 break;
 162         case 0x700:
 163                 boot_cpu_data.type = CPU_SH4_501;
 164                 boot_cpu_data.flags &= ~CPU_HAS_FPU;
 165                 boot_cpu_data.icache.ways = 2;
 166                 boot_cpu_data.dcache.ways = 2;
 167                 break;
 168         case 0x600:
 169                 boot_cpu_data.type = CPU_SH4_202;
 170                 boot_cpu_data.icache.ways = 2;
 171                 boot_cpu_data.dcache.ways = 2;
 172                 break;
 173         case 0x500 ... 0x501:
 174                 switch (prr) {
 175                 case 0x10:
 176                         boot_cpu_data.type = CPU_SH7750R;
 177                         break;
 178                 case 0x11:
 179                         boot_cpu_data.type = CPU_SH7751R;
 180                         break;
 181                 case 0x50 ... 0x5f:
 182                         boot_cpu_data.type = CPU_SH7760;
 183                         break;
 184                 }
 185
 186                 boot_cpu_data.icache.ways = 2;
 187                 boot_cpu_data.dcache.ways = 2;
 188
 189                 break;
 190         }
 191
 192         /*
 193          * On anything that's not a direct-mapped cache, look to the CVR
 194          * for I/D-cache specifics.
 195          */
 196         if (boot_cpu_data.icache.ways > 1) {
 197                 size = sizes[(cvr >> 20) & 0xf];
 198                 boot_cpu_data.icache.way_incr   = (size >> 1);
 199                 boot_cpu_data.icache.sets       = (size >> 6);
 200
 201         }
 202
 203         /* And the rest of the D-cache */
 204         if (boot_cpu_data.dcache.ways > 1) {
 205                 size = sizes[(cvr >> 16) & 0xf];
 206                 boot_cpu_data.dcache.way_incr   = (size >> 1);
 207                 boot_cpu_data.dcache.sets       = (size >> 6);
 208         }
 209
 210         /*
 211          * SH-4A's have an optional PIPT L2.
 212          */
 213         if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
 214                 /*
 215                  * Verify that it really has something hooked up, this
 216                  * is the safety net for CPUs that have optional L2
 217                  * support yet do not implement it.
 218                  */
 219                 if ((cvr & 0xf) == 0)
 220                         boot_cpu_data.flags &= ~CPU_HAS_L2_CACHE;
 221                 else {
 222                         /*
 223                          * Silicon and specifications have clearly never
 224                          * met..
 225                          */
 226                         cvr ^= 0xf;
 227
 228                         /*
 229                          * Size calculation is much more sensible
 230                          * than it is for the L1.
 231                          *
 232                          * Sizes are 128KB, 256KB, 512KB, and 1MB.
 233                          */
 234                         size = (cvr & 0xf) << 17;
 235
 236                         boot_cpu_data.scache.way_incr           = (1 << 16);
 237                         boot_cpu_data.scache.entry_shift        = 5;
 238                         boot_cpu_data.scache.ways               = 4;
 239                         boot_cpu_data.scache.linesz             = L1_CACHE_BYTES;
 240
 241                         boot_cpu_data.scache.entry_mask =
 242                                 (boot_cpu_data.scache.way_incr -
 243                                  boot_cpu_data.scache.linesz);
 244
 245                         boot_cpu_data.scache.sets       = size /
 246                                 (boot_cpu_data.scache.linesz *
 247                                  boot_cpu_data.scache.ways);
 248
 249                         boot_cpu_data.scache.way_size   =
 250                                 (boot_cpu_data.scache.sets *
 251                                  boot_cpu_data.scache.linesz);
 252                 }
 253         }
 254
 255         return 0;
 256 }