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/cacheflush.h>
  27 #include <asm/cplb.h>
  28 #include <asm/cplbinit.h>
  29
  30 #define CPLB_MEM CONFIG_MAX_MEM_SIZE
  31
  32 /*
  33 * Number of required data CPLB switchtable entries
  34 * MEMSIZE / 4 (we mostly install 4M page size CPLBs
  35 * approx 16 for smaller 1MB page size CPLBs for allignment purposes
  36 * 1 for L1 Data Memory
  37 * possibly 1 for L2 Data Memory
  38 * 1 for CONFIG_DEBUG_HUNT_FOR_ZERO
  39 * 1 for ASYNC Memory
  40 */
  41 #define MAX_SWITCH_D_CPLBS (((CPLB_MEM / 4) + 16 + 1 + 1 + 1 \
  42                                  + ASYNC_MEMORY_CPLB_COVERAGE) * 2)
  43
  44 /*
  45 * Number of required instruction CPLB switchtable entries
  46 * MEMSIZE / 4 (we mostly install 4M page size CPLBs
  47 * approx 12 for smaller 1MB page size CPLBs for allignment purposes
  48 * 1 for L1 Instruction Memory
  49 * possibly 1 for L2 Instruction Memory
  50 * 1 for CONFIG_DEBUG_HUNT_FOR_ZERO
  51 */
  52 #define MAX_SWITCH_I_CPLBS (((CPLB_MEM / 4) + 12 + 1 + 1 + 1) * 2)
  53
  54
  55 u_long icplb_table[MAX_CPLBS + 1];
  56 u_long dcplb_table[MAX_CPLBS + 1];
  57
  58 #ifdef CONFIG_CPLB_SWITCH_TAB_L1
  59 # define PDT_ATTR __attribute__((l1_data))
  60 #else
  61 # define PDT_ATTR
  62 #endif
  63
  64 u_long ipdt_table[MAX_SWITCH_I_CPLBS + 1] PDT_ATTR;
  65 u_long dpdt_table[MAX_SWITCH_D_CPLBS + 1] PDT_ATTR;
  66
  67 #ifdef CONFIG_CPLB_INFO
  68 u_long ipdt_swapcount_table[MAX_SWITCH_I_CPLBS] PDT_ATTR;
  69 u_long dpdt_swapcount_table[MAX_SWITCH_D_CPLBS] PDT_ATTR;
  70 #endif
  71
  72 struct s_cplb {
  73         struct cplb_tab init_i;
  74         struct cplb_tab init_d;
  75         struct cplb_tab switch_i;
  76         struct cplb_tab switch_d;
  77 };
  78
  79 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
  80 static struct cplb_desc cplb_data[] = {
  81         {
  82                 .start = 0,
  83                 .end = SIZE_1K,
  84                 .psize = SIZE_1K,
  85                 .attr = INITIAL_T | SWITCH_T | I_CPLB | D_CPLB,
  86                 .i_conf = SDRAM_OOPS,
  87                 .d_conf = SDRAM_OOPS,
  88 #if defined(CONFIG_DEBUG_HUNT_FOR_ZERO)
  89                 .valid = 1,
  90 #else
  91                 .valid = 0,
  92 #endif
  93                 .name = "Zero Pointer Guard Page",
  94         },
  95         {
  96                 .start = L1_CODE_START,
  97                 .end = L1_CODE_START + L1_CODE_LENGTH,
  98                 .psize = SIZE_4M,
  99                 .attr = INITIAL_T | SWITCH_T | I_CPLB,
 100                 .i_conf = L1_IMEMORY,
 101                 .d_conf = 0,
 102                 .valid = 1,
 103                 .name = "L1 I-Memory",
 104         },
 105         {
 106                 .start = L1_DATA_A_START,
 107                 .end = L1_DATA_B_START + L1_DATA_B_LENGTH,
 108                 .psize = SIZE_4M,
 109                 .attr = INITIAL_T | SWITCH_T | D_CPLB,
 110                 .i_conf = 0,
 111                 .d_conf = L1_DMEMORY,
 112 #if ((L1_DATA_A_LENGTH > 0) || (L1_DATA_B_LENGTH > 0))
 113                 .valid = 1,
 114 #else
 115                 .valid = 0,
 116 #endif
 117                 .name = "L1 D-Memory",
 118         },
 119         {
 120                 .start = 0,
 121                 .end = 0,  /* dynamic */
 122                 .psize = 0,
 123                 .attr = INITIAL_T | SWITCH_T | I_CPLB | D_CPLB,
 124                 .i_conf = SDRAM_IGENERIC,
 125                 .d_conf = SDRAM_DGENERIC,
 126                 .valid = 1,
 127                 .name = "Kernel Memory",
 128         },
 129         {
 130                 .start = 0, /* dynamic */
 131                 .end = 0, /* dynamic */
 132                 .psize = 0,
 133                 .attr = INITIAL_T | SWITCH_T | D_CPLB,
 134                 .i_conf = SDRAM_IGENERIC,
 135                 .d_conf = SDRAM_DNON_CHBL,
 136                 .valid = 1,
 137                 .name = "uClinux MTD Memory",
 138         },
 139         {
 140                 .start = 0, /* dynamic */
 141                 .end = 0,   /* dynamic */
 142                 .psize = SIZE_1M,
 143                 .attr = INITIAL_T | SWITCH_T | D_CPLB,
 144                 .d_conf = SDRAM_DNON_CHBL,
 145                 .valid = 1,
 146                 .name = "Uncached DMA Zone",
 147         },
 148         {
 149                 .start = 0, /* dynamic */
 150                 .end = 0, /* dynamic */
 151                 .psize = 0,
 152                 .attr = SWITCH_T | D_CPLB,
 153                 .i_conf = 0, /* dynamic */
 154                 .d_conf = 0, /* dynamic */
 155                 .valid = 1,
 156                 .name = "Reserved Memory",
 157         },
 158         {
 159                 .start = ASYNC_BANK0_BASE,
 160                 .end = ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE,
 161                 .psize = 0,
 162                 .attr = SWITCH_T | D_CPLB,
 163                 .d_conf = SDRAM_EBIU,
 164                 .valid = 1,
 165                 .name = "Asynchronous Memory Banks",
 166         },
 167         {
 168                 .start = L2_START,
 169                 .end = L2_START + L2_LENGTH,
 170                 .psize = SIZE_1M,
 171                 .attr = SWITCH_T | I_CPLB | D_CPLB,
 172                 .i_conf = L2_IMEMORY,
 173                 .d_conf = L2_DMEMORY,
 174                 .valid = (L2_LENGTH > 0),
 175                 .name = "L2 Memory",
 176         },
 177         {
 178                 .start = BOOT_ROM_START,
 179                 .end = BOOT_ROM_START + BOOT_ROM_LENGTH,
 180                 .psize = SIZE_1M,
 181                 .attr = SWITCH_T | I_CPLB | D_CPLB,
 182                 .i_conf = SDRAM_IGENERIC,
 183                 .d_conf = SDRAM_DGENERIC,
 184                 .valid = 1,
 185                 .name = "On-Chip BootROM",
 186         },
 187 };
 188
 189 static u16 __init lock_kernel_check(u32 start, u32 end)
 190 {
 191         if (start >= (u32)_end || end <= (u32)_stext)
 192                 return 0;
 193
 194         /* This cplb block overlapped with kernel area. */
 195         return IN_KERNEL;
 196 }
 197
 198 static unsigned short __init
 199 fill_cplbtab(struct cplb_tab *table,
 200              unsigned long start, unsigned long end,
 201              unsigned long block_size, unsigned long cplb_data)
 202 {
 203         int i;
 204
 205         switch (block_size) {
 206         case SIZE_4M:
 207                 i = 3;
 208                 break;
 209         case SIZE_1M:
 210                 i = 2;
 211                 break;
 212         case SIZE_4K:
 213                 i = 1;
 214                 break;
 215         case SIZE_1K:
 216         default:
 217                 i = 0;
 218                 break;
 219         }
 220
 221         cplb_data = (cplb_data & ~(3 << 16)) | (i << 16);
 222
 223         while ((start < end) && (table->pos < table->size)) {
 224
 225                 table->tab[table->pos++] = start;
 226
 227                 if (lock_kernel_check(start, start + block_size) == IN_KERNEL)
 228                         table->tab[table->pos++] =
 229                             cplb_data | CPLB_LOCK | CPLB_DIRTY;
 230                 else
 231                         table->tab[table->pos++] = cplb_data;
 232
 233                 start += block_size;
 234         }
 235         return 0;
 236 }
 237
 238 static unsigned short __init
 239 close_cplbtab(struct cplb_tab *table)
 240 {
 241
 242         while (table->pos < table->size) {
 243
 244                 table->tab[table->pos++] = 0;
 245                 table->tab[table->pos++] = 0; /* !CPLB_VALID */
 246         }
 247         return 0;
 248 }
 249
 250 /* helper function */
 251 static void __init
 252 __fill_code_cplbtab(struct cplb_tab *t, int i, u32 a_start, u32 a_end)
 253 {
 254         if (cplb_data[i].psize) {
 255                 fill_cplbtab(t,
 256                                 cplb_data[i].start,
 257                                 cplb_data[i].end,
 258                                 cplb_data[i].psize,
 259                                 cplb_data[i].i_conf);
 260         } else {
 261 #if defined(CONFIG_BFIN_ICACHE)
 262                 if (ANOMALY_05000263 && i == SDRAM_KERN) {
 263                         fill_cplbtab(t,
 264                                         cplb_data[i].start,
 265                                         cplb_data[i].end,
 266                                         SIZE_4M,
 267                                         cplb_data[i].i_conf);
 268                 } else
 269 #endif
 270                 {
 271                         fill_cplbtab(t,
 272                                         cplb_data[i].start,
 273                                         a_start,
 274                                         SIZE_1M,
 275                                         cplb_data[i].i_conf);
 276                         fill_cplbtab(t,
 277                                         a_start,
 278                                         a_end,
 279                                         SIZE_4M,
 280                                         cplb_data[i].i_conf);
 281                         fill_cplbtab(t, a_end,
 282                                         cplb_data[i].end,
 283                                         SIZE_1M,
 284                                         cplb_data[i].i_conf);
 285                 }
 286         }
 287 }
 288
 289 static void __init
 290 __fill_data_cplbtab(struct cplb_tab *t, int i, u32 a_start, u32 a_end)
 291 {
 292         if (cplb_data[i].psize) {
 293                 fill_cplbtab(t,
 294                                 cplb_data[i].start,
 295                                 cplb_data[i].end,
 296                                 cplb_data[i].psize,
 297                                 cplb_data[i].d_conf);
 298         } else {
 299                 fill_cplbtab(t,
 300                                 cplb_data[i].start,
 301                                 a_start, SIZE_1M,
 302                                 cplb_data[i].d_conf);
 303                 fill_cplbtab(t, a_start,
 304                                 a_end, SIZE_4M,
 305                                 cplb_data[i].d_conf);
 306                 fill_cplbtab(t, a_end,
 307                                 cplb_data[i].end,
 308                                 SIZE_1M,
 309                                 cplb_data[i].d_conf);
 310         }
 311 }
 312
 313 void __init generate_cplb_tables(void)
 314 {
 315
 316         u16 i, j, process;
 317         u32 a_start, a_end, as, ae, as_1m;
 318
 319         struct cplb_tab *t_i = NULL;
 320         struct cplb_tab *t_d = NULL;
 321         struct s_cplb cplb;
 322
 323         printk(KERN_INFO "NOMPU: setting up cplb tables for global access\n");
 324
 325         cplb.init_i.size = MAX_CPLBS;
 326         cplb.init_d.size = MAX_CPLBS;
 327         cplb.switch_i.size = MAX_SWITCH_I_CPLBS;
 328         cplb.switch_d.size = MAX_SWITCH_D_CPLBS;
 329
 330         cplb.init_i.pos = 0;
 331         cplb.init_d.pos = 0;
 332         cplb.switch_i.pos = 0;
 333         cplb.switch_d.pos = 0;
 334
 335         cplb.init_i.tab = icplb_table;
 336         cplb.init_d.tab = dcplb_table;
 337         cplb.switch_i.tab = ipdt_table;
 338         cplb.switch_d.tab = dpdt_table;
 339
 340         cplb_data[SDRAM_KERN].end = memory_end;
 341
 342 #ifdef CONFIG_MTD_UCLINUX
 343         cplb_data[SDRAM_RAM_MTD].start = memory_mtd_start;
 344         cplb_data[SDRAM_RAM_MTD].end = memory_mtd_start + mtd_size;
 345         cplb_data[SDRAM_RAM_MTD].valid = mtd_size > 0;
 346 # if defined(CONFIG_ROMFS_FS)
 347         cplb_data[SDRAM_RAM_MTD].attr |= I_CPLB;
 348
 349         /*
 350          * The ROMFS_FS size is often not multiple of 1MB.
 351          * This can cause multiple CPLB sets covering the same memory area.
 352          * This will then cause multiple CPLB hit exceptions.
 353          * Workaround: We ensure a contiguous memory area by extending the kernel
 354          * memory section over the mtd section.
 355          * For ROMFS_FS memory must be covered with ICPLBs anyways.
 356          * So there is no difference between kernel and mtd memory setup.
 357          */
 358
 359         cplb_data[SDRAM_KERN].end = memory_mtd_start + mtd_size;;
 360         cplb_data[SDRAM_RAM_MTD].valid = 0;
 361
 362 # endif
 363 #else
 364         cplb_data[SDRAM_RAM_MTD].valid = 0;
 365 #endif
 366
 367         cplb_data[SDRAM_DMAZ].start = _ramend - DMA_UNCACHED_REGION;
 368         cplb_data[SDRAM_DMAZ].end = _ramend;
 369
 370         cplb_data[RES_MEM].start = _ramend;
 371         cplb_data[RES_MEM].end = physical_mem_end;
 372
 373         if (reserved_mem_dcache_on)
 374                 cplb_data[RES_MEM].d_conf = SDRAM_DGENERIC;
 375         else
 376                 cplb_data[RES_MEM].d_conf = SDRAM_DNON_CHBL;
 377
 378         if (reserved_mem_icache_on)
 379                 cplb_data[RES_MEM].i_conf = SDRAM_IGENERIC;
 380         else
 381                 cplb_data[RES_MEM].i_conf = SDRAM_INON_CHBL;
 382
 383         for (i = ZERO_P; i < ARRAY_SIZE(cplb_data); ++i) {
 384                 if (!cplb_data[i].valid)
 385                         continue;
 386
 387                 as_1m = cplb_data[i].start % SIZE_1M;
 388
 389                 /* We need to make sure all sections are properly 1M aligned
 390                  * However between Kernel Memory and the Kernel mtd section, depending on the
 391                  * rootfs size, there can be overlapping memory areas.
 392                  */
 393
 394                 if (as_1m && i != L1I_MEM && i != L1D_MEM) {
 395 #ifdef CONFIG_MTD_UCLINUX
 396                         if (i == SDRAM_RAM_MTD) {
 397                                 if ((cplb_data[SDRAM_KERN].end + 1) > cplb_data[SDRAM_RAM_MTD].start)
 398                                         cplb_data[SDRAM_RAM_MTD].start = (cplb_data[i].start & (-2*SIZE_1M)) + SIZE_1M;
 399                                 else
 400                                         cplb_data[SDRAM_RAM_MTD].start = (cplb_data[i].start & (-2*SIZE_1M));
 401                         } else
 402 #endif
 403                                 printk(KERN_WARNING "Unaligned Start of %s at 0x%X\n",
 404                                        cplb_data[i].name, cplb_data[i].start);
 405                 }
 406
 407                 as = cplb_data[i].start % SIZE_4M;
 408                 ae = cplb_data[i].end % SIZE_4M;
 409
 410                 if (as)
 411                         a_start = cplb_data[i].start + (SIZE_4M - (as));
 412                 else
 413                         a_start = cplb_data[i].start;
 414
 415                 a_end = cplb_data[i].end - ae;
 416
 417                 for (j = INITIAL_T; j <= SWITCH_T; j++) {
 418
 419                         switch (j) {
 420                         case INITIAL_T:
 421                                 if (cplb_data[i].attr & INITIAL_T) {
 422                                         t_i = &cplb.init_i;
 423                                         t_d = &cplb.init_d;
 424                                         process = 1;
 425                                 } else
 426                                         process = 0;
 427                                 break;
 428                         case SWITCH_T:
 429                                 if (cplb_data[i].attr & SWITCH_T) {
 430                                         t_i = &cplb.switch_i;
 431                                         t_d = &cplb.switch_d;
 432                                         process = 1;
 433                                 } else
 434                                         process = 0;
 435                                 break;
 436                         default:
 437                                         process = 0;
 438                                 break;
 439                         }
 440
 441                         if (!process)
 442                                 continue;
 443                         if (cplb_data[i].attr & I_CPLB)
 444                                 __fill_code_cplbtab(t_i, i, a_start, a_end);
 445
 446                         if (cplb_data[i].attr & D_CPLB)
 447                                 __fill_data_cplbtab(t_d, i, a_start, a_end);
 448                 }
 449         }
 450
 451 /* close tables */
 452
 453         close_cplbtab(&cplb.init_i);
 454         close_cplbtab(&cplb.init_d);
 455
 456         cplb.init_i.tab[cplb.init_i.pos] = -1;
 457         cplb.init_d.tab[cplb.init_d.pos] = -1;
 458         cplb.switch_i.tab[cplb.switch_i.pos] = -1;
 459         cplb.switch_d.tab[cplb.switch_d.pos] = -1;
 460
 461 }
 462
 463 #endif
 464