arch/blackfin/kernel/cplb-nompu/cplbinit.c

   1 /*
   2  * Blackfin CPLB initialization
   3  *
   4  *               Copyright 2004-2007 Analog Devices Inc.
   5  *
   6  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, see the file COPYING, or write
  20  * to the Free Software Foundation, Inc.,
  21  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  22  */
  23 #include <linux/module.h>
  24
  25 #include <asm/blackfin.h>
  26 #include <asm/cplb.h>
  27 #include <asm/cplbinit.h>
  28
  29 #define CPLB_MEM CONFIG_MAX_MEM_SIZE
  30
  31 /*
  32 * Number of required data CPLB switchtable entries
  33 * MEMSIZE / 4 (we mostly install 4M page size CPLBs
  34 * approx 16 for smaller 1MB page size CPLBs for allignment purposes
  35 * 1 for L1 Data Memory
  36 * possibly 1 for L2 Data Memory
  37 * 1 for CONFIG_DEBUG_HUNT_FOR_ZERO
  38 * 1 for ASYNC Memory
  39 */
  40 #define MAX_SWITCH_D_CPLBS (((CPLB_MEM / 4) + 16 + 1 + 1 + 1 \
  41                                  + ASYNC_MEMORY_CPLB_COVERAGE) * 2)
  42
  43 /*
  44 * Number of required instruction CPLB switchtable entries
  45 * MEMSIZE / 4 (we mostly install 4M page size CPLBs
  46 * approx 12 for smaller 1MB page size CPLBs for allignment purposes
  47 * 1 for L1 Instruction Memory
  48 * possibly 1 for L2 Instruction Memory
  49 * 1 for CONFIG_DEBUG_HUNT_FOR_ZERO
  50 */
  51 #define MAX_SWITCH_I_CPLBS (((CPLB_MEM / 4) + 12 + 1 + 1 + 1) * 2)
  52
  53
  54 u_long icplb_table[MAX_CPLBS + 1];
  55 u_long dcplb_table[MAX_CPLBS + 1];
  56
  57 #ifdef CONFIG_CPLB_SWITCH_TAB_L1
  58 # define PDT_ATTR __attribute__((l1_data))
  59 #else
  60 # define PDT_ATTR
  61 #endif
  62
  63 u_long ipdt_table[MAX_SWITCH_I_CPLBS + 1] PDT_ATTR;
  64 u_long dpdt_table[MAX_SWITCH_D_CPLBS + 1] PDT_ATTR;
  65
  66 #ifdef CONFIG_CPLB_INFO
  67 u_long ipdt_swapcount_table[MAX_SWITCH_I_CPLBS] PDT_ATTR;
  68 u_long dpdt_swapcount_table[MAX_SWITCH_D_CPLBS] PDT_ATTR;
  69 #endif
  70
  71 struct s_cplb {
  72         struct cplb_tab init_i;
  73         struct cplb_tab init_d;
  74         struct cplb_tab switch_i;
  75         struct cplb_tab switch_d;
  76 };
  77
  78 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
  79 static struct cplb_desc cplb_data[] = {
  80         {
  81                 .start = 0,
  82                 .end = SIZE_1K,
  83                 .psize = SIZE_1K,
  84                 .attr = INITIAL_T | SWITCH_T | I_CPLB | D_CPLB,
  85                 .i_conf = SDRAM_OOPS,
  86                 .d_conf = SDRAM_OOPS,
  87 #if defined(CONFIG_DEBUG_HUNT_FOR_ZERO)
  88                 .valid = 1,
  89 #else
  90                 .valid = 0,
  91 #endif
  92                 .name = "Zero Pointer Guard Page",
  93         },
  94         {
  95                 .start = L1_CODE_START,
  96                 .end = L1_CODE_START + L1_CODE_LENGTH,
  97                 .psize = SIZE_4M,
  98                 .attr = INITIAL_T | SWITCH_T | I_CPLB,
  99                 .i_conf = L1_IMEMORY,
 100                 .d_conf = 0,
 101                 .valid = 1,
 102                 .name = "L1 I-Memory",
 103         },
 104         {
 105                 .start = L1_DATA_A_START,
 106                 .end = L1_DATA_B_START + L1_DATA_B_LENGTH,
 107                 .psize = SIZE_4M,
 108                 .attr = INITIAL_T | SWITCH_T | D_CPLB,
 109                 .i_conf = 0,
 110                 .d_conf = L1_DMEMORY,
 111 #if ((L1_DATA_A_LENGTH > 0) || (L1_DATA_B_LENGTH > 0))
 112                 .valid = 1,
 113 #else
 114                 .valid = 0,
 115 #endif
 116                 .name = "L1 D-Memory",
 117         },
 118         {
 119                 .start = 0,
 120                 .end = 0,  /* dynamic */
 121                 .psize = 0,
 122                 .attr = INITIAL_T | SWITCH_T | I_CPLB | D_CPLB,
 123                 .i_conf = SDRAM_IGENERIC,
 124                 .d_conf = SDRAM_DGENERIC,
 125                 .valid = 1,
 126                 .name = "Kernel Memory",
 127         },
 128         {
 129                 .start = 0, /* dynamic */
 130                 .end = 0, /* dynamic */
 131                 .psize = 0,
 132                 .attr = INITIAL_T | SWITCH_T | D_CPLB,
 133                 .i_conf = SDRAM_IGENERIC,
 134                 .d_conf = SDRAM_DNON_CHBL,
 135                 .valid = 1,
 136                 .name = "uClinux MTD Memory",
 137         },
 138         {
 139                 .start = 0, /* dynamic */
 140                 .end = 0,   /* dynamic */
 141                 .psize = SIZE_1M,
 142                 .attr = INITIAL_T | SWITCH_T | D_CPLB,
 143                 .d_conf = SDRAM_DNON_CHBL,
 144                 .valid = 1,
 145                 .name = "Uncached DMA Zone",
 146         },
 147         {
 148                 .start = 0, /* dynamic */
 149                 .end = 0, /* dynamic */
 150                 .psize = 0,
 151                 .attr = SWITCH_T | D_CPLB,
 152                 .i_conf = 0, /* dynamic */
 153                 .d_conf = 0, /* dynamic */
 154                 .valid = 1,
 155                 .name = "Reserved Memory",
 156         },
 157         {
 158                 .start = ASYNC_BANK0_BASE,
 159                 .end = ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE,
 160                 .psize = 0,
 161                 .attr = SWITCH_T | D_CPLB,
 162                 .d_conf = SDRAM_EBIU,
 163                 .valid = 1,
 164                 .name = "Asynchronous Memory Banks",
 165         },
 166         {
 167                 .start = L2_START,
 168                 .end = L2_START + L2_LENGTH,
 169                 .psize = SIZE_1M,
 170                 .attr = SWITCH_T | I_CPLB | D_CPLB,
 171                 .i_conf = L2_MEMORY,
 172                 .d_conf = L2_MEMORY,
 173                 .valid = (L2_LENGTH > 0),
 174                 .name = "L2 Memory",
 175         },
 176         {
 177                 .start = BOOT_ROM_START,
 178                 .end = BOOT_ROM_START + BOOT_ROM_LENGTH,
 179                 .psize = SIZE_1M,
 180                 .attr = SWITCH_T | I_CPLB | D_CPLB,
 181                 .i_conf = SDRAM_IGENERIC,
 182                 .d_conf = SDRAM_DGENERIC,
 183                 .valid = 1,
 184                 .name = "On-Chip BootROM",
 185         },
 186 };
 187
 188 static u16 __init lock_kernel_check(u32 start, u32 end)
 189 {
 190         if ((end   <= (u32) _end && end   >= (u32)_stext) ||
 191             (start <= (u32) _end && start >= (u32)_stext))
 192                 return IN_KERNEL;
 193         return 0;
 194 }
 195
 196 static unsigned short __init
 197 fill_cplbtab(struct cplb_tab *table,
 198              unsigned long start, unsigned long end,
 199              unsigned long block_size, unsigned long cplb_data)
 200 {
 201         int i;
 202
 203         switch (block_size) {
 204         case SIZE_4M:
 205                 i = 3;
 206                 break;
 207         case SIZE_1M:
 208                 i = 2;
 209                 break;
 210         case SIZE_4K:
 211                 i = 1;
 212                 break;
 213         case SIZE_1K:
 214         default:
 215                 i = 0;
 216                 break;
 217         }
 218
 219         cplb_data = (cplb_data & ~(3 << 16)) | (i << 16);
 220
 221         while ((start < end) && (table->pos < table->size)) {
 222
 223                 table->tab[table->pos++] = start;
 224
 225                 if (lock_kernel_check(start, start + block_size) == IN_KERNEL)
 226                         table->tab[table->pos++] =
 227                             cplb_data | CPLB_LOCK | CPLB_DIRTY;
 228                 else
 229                         table->tab[table->pos++] = cplb_data;
 230
 231                 start += block_size;
 232         }
 233         return 0;
 234 }
 235
 236 static unsigned short __init
 237 close_cplbtab(struct cplb_tab *table)
 238 {
 239
 240         while (table->pos < table->size) {
 241
 242                 table->tab[table->pos++] = 0;
 243                 table->tab[table->pos++] = 0; /* !CPLB_VALID */
 244         }
 245         return 0;
 246 }
 247
 248 /* helper function */
 249 static void __init
 250 __fill_code_cplbtab(struct cplb_tab *t, int i, u32 a_start, u32 a_end)
 251 {
 252         if (cplb_data[i].psize) {
 253                 fill_cplbtab(t,
 254                                 cplb_data[i].start,
 255                                 cplb_data[i].end,
 256                                 cplb_data[i].psize,
 257                                 cplb_data[i].i_conf);
 258         } else {
 259 #if defined(CONFIG_BFIN_ICACHE)
 260                 if (ANOMALY_05000263 && i == SDRAM_KERN) {
 261                         fill_cplbtab(t,
 262                                         cplb_data[i].start,
 263                                         cplb_data[i].end,
 264                                         SIZE_4M,
 265                                         cplb_data[i].i_conf);
 266                 } else
 267 #endif
 268                 {
 269                         fill_cplbtab(t,
 270                                         cplb_data[i].start,
 271                                         a_start,
 272                                         SIZE_1M,
 273                                         cplb_data[i].i_conf);
 274                         fill_cplbtab(t,
 275                                         a_start,
 276                                         a_end,
 277                                         SIZE_4M,
 278                                         cplb_data[i].i_conf);
 279                         fill_cplbtab(t, a_end,
 280                                         cplb_data[i].end,
 281                                         SIZE_1M,
 282                                         cplb_data[i].i_conf);
 283                 }
 284         }
 285 }
 286
 287 static void __init
 288 __fill_data_cplbtab(struct cplb_tab *t, int i, u32 a_start, u32 a_end)
 289 {
 290         if (cplb_data[i].psize) {
 291                 fill_cplbtab(t,
 292                                 cplb_data[i].start,
 293                                 cplb_data[i].end,
 294                                 cplb_data[i].psize,
 295                                 cplb_data[i].d_conf);
 296         } else {
 297                 fill_cplbtab(t,
 298                                 cplb_data[i].start,
 299                                 a_start, SIZE_1M,
 300                                 cplb_data[i].d_conf);
 301                 fill_cplbtab(t, a_start,
 302                                 a_end, SIZE_4M,
 303                                 cplb_data[i].d_conf);
 304                 fill_cplbtab(t, a_end,
 305                                 cplb_data[i].end,
 306                                 SIZE_1M,
 307                                 cplb_data[i].d_conf);
 308         }
 309 }
 310
 311 void __init generate_cplb_tables(void)
 312 {
 313
 314         u16 i, j, process;
 315         u32 a_start, a_end, as, ae, as_1m;
 316
 317         struct cplb_tab *t_i = NULL;
 318         struct cplb_tab *t_d = NULL;
 319         struct s_cplb cplb;
 320
 321         printk(KERN_INFO "NOMPU: setting up cplb tables for global access\n");
 322
 323         cplb.init_i.size = MAX_CPLBS;
 324         cplb.init_d.size = MAX_CPLBS;
 325         cplb.switch_i.size = MAX_SWITCH_I_CPLBS;
 326         cplb.switch_d.size = MAX_SWITCH_D_CPLBS;
 327
 328         cplb.init_i.pos = 0;
 329         cplb.init_d.pos = 0;
 330         cplb.switch_i.pos = 0;
 331         cplb.switch_d.pos = 0;
 332
 333         cplb.init_i.tab = icplb_table;
 334         cplb.init_d.tab = dcplb_table;
 335         cplb.switch_i.tab = ipdt_table;
 336         cplb.switch_d.tab = dpdt_table;
 337
 338         cplb_data[SDRAM_KERN].end = memory_end;
 339
 340 #ifdef CONFIG_MTD_UCLINUX
 341         cplb_data[SDRAM_RAM_MTD].start = memory_mtd_start;
 342         cplb_data[SDRAM_RAM_MTD].end = memory_mtd_start + mtd_size;
 343         cplb_data[SDRAM_RAM_MTD].valid = mtd_size > 0;
 344 # if defined(CONFIG_ROMFS_FS)
 345         cplb_data[SDRAM_RAM_MTD].attr |= I_CPLB;
 346
 347         /*
 348          * The ROMFS_FS size is often not multiple of 1MB.
 349          * This can cause multiple CPLB sets covering the same memory area.
 350          * This will then cause multiple CPLB hit exceptions.
 351          * Workaround: We ensure a contiguous memory area by extending the kernel
 352          * memory section over the mtd section.
 353          * For ROMFS_FS memory must be covered with ICPLBs anyways.
 354          * So there is no difference between kernel and mtd memory setup.
 355          */
 356
 357         cplb_data[SDRAM_KERN].end = memory_mtd_start + mtd_size;;
 358         cplb_data[SDRAM_RAM_MTD].valid = 0;
 359
 360 # endif
 361 #else
 362         cplb_data[SDRAM_RAM_MTD].valid = 0;
 363 #endif
 364
 365         cplb_data[SDRAM_DMAZ].start = _ramend - DMA_UNCACHED_REGION;
 366         cplb_data[SDRAM_DMAZ].end = _ramend;
 367
 368         cplb_data[RES_MEM].start = _ramend;
 369         cplb_data[RES_MEM].end = physical_mem_end;
 370
 371         if (reserved_mem_dcache_on)
 372                 cplb_data[RES_MEM].d_conf = SDRAM_DGENERIC;
 373         else
 374                 cplb_data[RES_MEM].d_conf = SDRAM_DNON_CHBL;
 375
 376         if (reserved_mem_icache_on)
 377                 cplb_data[RES_MEM].i_conf = SDRAM_IGENERIC;
 378         else
 379                 cplb_data[RES_MEM].i_conf = SDRAM_INON_CHBL;
 380
 381         for (i = ZERO_P; i < ARRAY_SIZE(cplb_data); ++i) {
 382                 if (!cplb_data[i].valid)
 383                         continue;
 384
 385                 as_1m = cplb_data[i].start % SIZE_1M;
 386
 387                 /* We need to make sure all sections are properly 1M aligned
 388                  * However between Kernel Memory and the Kernel mtd section, depending on the
 389                  * rootfs size, there can be overlapping memory areas.
 390                  */
 391
 392                 if (as_1m && i != L1I_MEM && i != L1D_MEM) {
 393 #ifdef CONFIG_MTD_UCLINUX
 394                         if (i == SDRAM_RAM_MTD) {
 395                                 if ((cplb_data[SDRAM_KERN].end + 1) > cplb_data[SDRAM_RAM_MTD].start)
 396                                         cplb_data[SDRAM_RAM_MTD].start = (cplb_data[i].start & (-2*SIZE_1M)) + SIZE_1M;
 397                                 else
 398                                         cplb_data[SDRAM_RAM_MTD].start = (cplb_data[i].start & (-2*SIZE_1M));
 399                         } else
 400 #endif
 401                                 printk(KERN_WARNING "Unaligned Start of %s at 0x%X\n",
 402                                        cplb_data[i].name, cplb_data[i].start);
 403                 }
 404
 405                 as = cplb_data[i].start % SIZE_4M;
 406                 ae = cplb_data[i].end % SIZE_4M;
 407
 408                 if (as)
 409                         a_start = cplb_data[i].start + (SIZE_4M - (as));
 410                 else
 411                         a_start = cplb_data[i].start;
 412
 413                 a_end = cplb_data[i].end - ae;
 414
 415                 for (j = INITIAL_T; j <= SWITCH_T; j++) {
 416
 417                         switch (j) {
 418                         case INITIAL_T:
 419                                 if (cplb_data[i].attr & INITIAL_T) {
 420                                         t_i = &cplb.init_i;
 421                                         t_d = &cplb.init_d;
 422                                         process = 1;
 423                                 } else
 424                                         process = 0;
 425                                 break;
 426                         case SWITCH_T:
 427                                 if (cplb_data[i].attr & SWITCH_T) {
 428                                         t_i = &cplb.switch_i;
 429                                         t_d = &cplb.switch_d;
 430                                         process = 1;
 431                                 } else
 432                                         process = 0;
 433                                 break;
 434                         default:
 435                                         process = 0;
 436                                 break;
 437                         }
 438
 439                         if (!process)
 440                                 continue;
 441                         if (cplb_data[i].attr & I_CPLB)
 442                                 __fill_code_cplbtab(t_i, i, a_start, a_end);
 443
 444                         if (cplb_data[i].attr & D_CPLB)
 445                                 __fill_data_cplbtab(t_d, i, a_start, a_end);
 446                 }
 447         }
 448
 449 /* close tables */
 450
 451         close_cplbtab(&cplb.init_i);
 452         close_cplbtab(&cplb.init_d);
 453
 454         cplb.init_i.tab[cplb.init_i.pos] = -1;
 455         cplb.init_d.tab[cplb.init_d.pos] = -1;
 456         cplb.switch_i.tab[cplb.switch_i.pos] = -1;
 457         cplb.switch_d.tab[cplb.switch_d.pos] = -1;
 458
 459 }
 460
 461 #endif
 462