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 - 2006  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 <linux/smp.h>
  16 #include <asm/processor.h>
  17 #include <asm/cache.h>
  18
  19 int __init detect_cpu_and_cache_system(void)
  20 {
  21         unsigned long pvr, prr, cvr;
  22         unsigned long size;
  23
  24         static unsigned long sizes[16] = {
  25                 [1] = (1 << 12),
  26                 [2] = (1 << 13),
  27                 [4] = (1 << 14),
  28                 [8] = (1 << 15),
  29                 [9] = (1 << 16)
  30         };
  31
  32         pvr = (ctrl_inl(CCN_PVR) >> 8) & 0xffffff;
  33         prr = (ctrl_inl(CCN_PRR) >> 4) & 0xff;
  34         cvr = (ctrl_inl(CCN_CVR));
  35
  36         /*
  37          * Setup some sane SH-4 defaults for the icache
  38          */
  39         current_cpu_data.icache.way_incr        = (1 << 13);
  40         current_cpu_data.icache.entry_shift     = 5;
  41         current_cpu_data.icache.sets            = 256;
  42         current_cpu_data.icache.ways            = 1;
  43         current_cpu_data.icache.linesz          = L1_CACHE_BYTES;
  44
  45         /*
  46          * And again for the dcache ..
  47          */
  48         current_cpu_data.dcache.way_incr        = (1 << 14);
  49         current_cpu_data.dcache.entry_shift     = 5;
  50         current_cpu_data.dcache.sets            = 512;
  51         current_cpu_data.dcache.ways            = 1;
  52         current_cpu_data.dcache.linesz          = L1_CACHE_BYTES;
  53
  54         /*
  55          * Setup some generic flags we can probe
  56          * (L2 and DSP detection only work on SH-4A)
  57          */
  58         if (((pvr >> 16) & 0xff) == 0x10) {
  59                 if ((cvr & 0x02000000) == 0)
  60                         current_cpu_data.flags |= CPU_HAS_L2_CACHE;
  61                 if ((cvr & 0x10000000) == 0)
  62                         current_cpu_data.flags |= CPU_HAS_DSP;
  63
  64                 current_cpu_data.flags |= CPU_HAS_LLSC;
  65         }
  66
  67         /* FPU detection works for everyone */
  68         if ((cvr & 0x20000000) == 1)
  69                 current_cpu_data.flags |= CPU_HAS_FPU;
  70
  71         /* Mask off the upper chip ID */
  72         pvr &= 0xffff;
  73
  74         /*
  75          * Probe the underlying processor version/revision and
  76          * adjust cpu_data setup accordingly.
  77          */
  78         switch (pvr) {
  79         case 0x205:
  80                 current_cpu_data.type = CPU_SH7750;
  81                 current_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
  82                                    CPU_HAS_PERF_COUNTER;
  83                 break;
  84         case 0x206:
  85                 current_cpu_data.type = CPU_SH7750S;
  86                 current_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
  87                                    CPU_HAS_PERF_COUNTER;
  88                 break;
  89         case 0x1100:
  90                 current_cpu_data.type = CPU_SH7751;
  91                 current_cpu_data.flags |= CPU_HAS_FPU;
  92                 break;
  93         case 0x2000:
  94                 current_cpu_data.type = CPU_SH73180;
  95                 current_cpu_data.icache.ways = 4;
  96                 current_cpu_data.dcache.ways = 4;
  97                 current_cpu_data.flags |= CPU_HAS_LLSC;
  98                 break;
  99         case 0x2001:
 100         case 0x2004:
 101                 current_cpu_data.type = CPU_SH7770;
 102                 current_cpu_data.icache.ways = 4;
 103                 current_cpu_data.dcache.ways = 4;
 104
 105                 current_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_LLSC;
 106                 break;
 107         case 0x2006:
 108         case 0x200A:
 109                 if (prr == 0x61)
 110                         current_cpu_data.type = CPU_SH7781;
 111                 else
 112                         current_cpu_data.type = CPU_SH7780;
 113
 114                 current_cpu_data.icache.ways = 4;
 115                 current_cpu_data.dcache.ways = 4;
 116
 117                 current_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
 118                                    CPU_HAS_LLSC;
 119                 break;
 120         case 0x3000:
 121         case 0x3003:
 122         case 0x3009:
 123                 current_cpu_data.type = CPU_SH7343;
 124                 current_cpu_data.icache.ways = 4;
 125                 current_cpu_data.dcache.ways = 4;
 126                 current_cpu_data.flags |= CPU_HAS_LLSC;
 127                 break;
 128         case 0x3004:
 129         case 0x3007:
 130                 current_cpu_data.type = CPU_SH7785;
 131                 current_cpu_data.icache.ways = 4;
 132                 current_cpu_data.dcache.ways = 4;
 133                 current_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
 134                                           CPU_HAS_LLSC;
 135                 break;
 136         case 0x3008:
 137                 if (prr == 0xa0) {
 138                         current_cpu_data.type = CPU_SH7722;
 139                         current_cpu_data.icache.ways = 4;
 140                         current_cpu_data.dcache.ways = 4;
 141                         current_cpu_data.flags |= CPU_HAS_LLSC;
 142                 }
 143                 break;
 144         case 0x4000:    /* 1st cut */
 145         case 0x4001:    /* 2nd cut */
 146                 current_cpu_data.type = CPU_SHX3;
 147                 current_cpu_data.icache.ways = 4;
 148                 current_cpu_data.dcache.ways = 4;
 149                 current_cpu_data.flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
 150                                           CPU_HAS_LLSC;
 151                 break;
 152         case 0x8000:
 153                 current_cpu_data.type = CPU_ST40RA;
 154                 current_cpu_data.flags |= CPU_HAS_FPU;
 155                 break;
 156         case 0x8100:
 157                 current_cpu_data.type = CPU_ST40GX1;
 158                 current_cpu_data.flags |= CPU_HAS_FPU;
 159                 break;
 160         case 0x700:
 161                 current_cpu_data.type = CPU_SH4_501;
 162                 current_cpu_data.icache.ways = 2;
 163                 current_cpu_data.dcache.ways = 2;
 164                 break;
 165         case 0x600:
 166                 current_cpu_data.type = CPU_SH4_202;
 167                 current_cpu_data.icache.ways = 2;
 168                 current_cpu_data.dcache.ways = 2;
 169                 current_cpu_data.flags |= CPU_HAS_FPU;
 170                 break;
 171         case 0x500 ... 0x501:
 172                 switch (prr) {
 173                 case 0x10:
 174                         current_cpu_data.type = CPU_SH7750R;
 175                         break;
 176                 case 0x11:
 177                         current_cpu_data.type = CPU_SH7751R;
 178                         break;
 179                 case 0x50 ... 0x5f:
 180                         current_cpu_data.type = CPU_SH7760;
 181                         break;
 182                 }
 183
 184                 current_cpu_data.icache.ways = 2;
 185                 current_cpu_data.dcache.ways = 2;
 186
 187                 current_cpu_data.flags |= CPU_HAS_FPU;
 188
 189                 break;
 190         default:
 191                 current_cpu_data.type = CPU_SH_NONE;
 192                 break;
 193         }
 194
 195 #ifdef CONFIG_SH_DIRECT_MAPPED
 196         current_cpu_data.icache.ways = 1;
 197         current_cpu_data.dcache.ways = 1;
 198 #endif
 199
 200 #ifdef CONFIG_CPU_HAS_PTEA
 201         current_cpu_data.flags |= CPU_HAS_PTEA;
 202 #endif
 203
 204         /*
 205          * On anything that's not a direct-mapped cache, look to the CVR
 206          * for I/D-cache specifics.
 207          */
 208         if (current_cpu_data.icache.ways > 1) {
 209                 size = sizes[(cvr >> 20) & 0xf];
 210                 current_cpu_data.icache.way_incr        = (size >> 1);
 211                 current_cpu_data.icache.sets            = (size >> 6);
 212
 213         }
 214
 215         /* And the rest of the D-cache */
 216         if (current_cpu_data.dcache.ways > 1) {
 217                 size = sizes[(cvr >> 16) & 0xf];
 218                 current_cpu_data.dcache.way_incr        = (size >> 1);
 219                 current_cpu_data.dcache.sets            = (size >> 6);
 220         }
 221
 222         /*
 223          * Setup the L2 cache desc
 224          *
 225          * SH-4A's have an optional PIPT L2.
 226          */
 227         if (current_cpu_data.flags & CPU_HAS_L2_CACHE) {
 228                 /*
 229                  * Size calculation is much more sensible
 230                  * than it is for the L1.
 231                  *
 232                  * Sizes are 128KB, 258KB, 512KB, and 1MB.
 233                  */
 234                 size = (cvr & 0xf) << 17;
 235
 236                 BUG_ON(!size);
 237
 238                 current_cpu_data.scache.way_incr        = (1 << 16);
 239                 current_cpu_data.scache.entry_shift     = 5;
 240                 current_cpu_data.scache.ways            = 4;
 241                 current_cpu_data.scache.linesz          = L1_CACHE_BYTES;
 242
 243                 current_cpu_data.scache.entry_mask      =
 244                         (current_cpu_data.scache.way_incr -
 245                          current_cpu_data.scache.linesz);
 246
 247                 current_cpu_data.scache.sets            = size /
 248                         (current_cpu_data.scache.linesz *
 249                          current_cpu_data.scache.ways);
 250
 251                 current_cpu_data.scache.way_size        =
 252                         (current_cpu_data.scache.sets *
 253                          current_cpu_data.scache.linesz);
 254         }
 255
 256         return 0;
 257 }