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 ((end   <= (u32) _end && end   >= (u32)_stext) ||
 192             (start <= (u32) _end && start >= (u32)_stext))
 193                 return IN_KERNEL;
 194         return 0;
 195 }
 196
 197 static unsigned short __init
 198 fill_cplbtab(struct cplb_tab *table,
 199              unsigned long start, unsigned long end,
 200              unsigned long block_size, unsigned long cplb_data)
 201 {
 202         int i;
 203
 204         switch (block_size) {
 205         case SIZE_4M:
 206                 i = 3;
 207                 break;
 208         case SIZE_1M:
 209                 i = 2;
 210                 break;
 211         case SIZE_4K:
 212                 i = 1;
 213                 break;
 214         case SIZE_1K:
 215         default:
 216                 i = 0;
 217                 break;
 218         }
 219
 220         cplb_data = (cplb_data & ~(3 << 16)) | (i << 16);
 221
 222         while ((start < end) && (table->pos < table->size)) {
 223
 224                 table->tab[table->pos++] = start;
 225
 226                 if (lock_kernel_check(start, start + block_size) == IN_KERNEL)
 227                         table->tab[table->pos++] =
 228                             cplb_data | CPLB_LOCK | CPLB_DIRTY;
 229                 else
 230                         table->tab[table->pos++] = cplb_data;
 231
 232                 start += block_size;
 233         }
 234         return 0;
 235 }
 236
 237 static unsigned short __init
 238 close_cplbtab(struct cplb_tab *table)
 239 {
 240
 241         while (table->pos < table->size) {
 242
 243                 table->tab[table->pos++] = 0;
 244                 table->tab[table->pos++] = 0; /* !CPLB_VALID */
 245         }
 246         return 0;
 247 }
 248
 249 /* helper function */
 250 static void __init
 251 __fill_code_cplbtab(struct cplb_tab *t, int i, u32 a_start, u32 a_end)
 252 {
 253         if (cplb_data[i].psize) {
 254                 fill_cplbtab(t,
 255                                 cplb_data[i].start,
 256                                 cplb_data[i].end,
 257                                 cplb_data[i].psize,
 258                                 cplb_data[i].i_conf);
 259         } else {
 260 #if defined(CONFIG_BFIN_ICACHE)
 261                 if (ANOMALY_05000263 && i == SDRAM_KERN) {
 262                         fill_cplbtab(t,
 263                                         cplb_data[i].start,
 264                                         cplb_data[i].end,
 265                                         SIZE_4M,
 266                                         cplb_data[i].i_conf);
 267                 } else
 268 #endif
 269                 {
 270                         fill_cplbtab(t,
 271                                         cplb_data[i].start,
 272                                         a_start,
 273                                         SIZE_1M,
 274                                         cplb_data[i].i_conf);
 275                         fill_cplbtab(t,
 276                                         a_start,
 277                                         a_end,
 278                                         SIZE_4M,
 279                                         cplb_data[i].i_conf);
 280                         fill_cplbtab(t, a_end,
 281                                         cplb_data[i].end,
 282                                         SIZE_1M,
 283                                         cplb_data[i].i_conf);
 284                 }
 285         }
 286 }
 287
 288 static void __init
 289 __fill_data_cplbtab(struct cplb_tab *t, int i, u32 a_start, u32 a_end)
 290 {
 291         if (cplb_data[i].psize) {
 292                 fill_cplbtab(t,
 293                                 cplb_data[i].start,
 294                                 cplb_data[i].end,
 295                                 cplb_data[i].psize,
 296                                 cplb_data[i].d_conf);
 297         } else {
 298                 fill_cplbtab(t,
 299                                 cplb_data[i].start,
 300                                 a_start, SIZE_1M,
 301                                 cplb_data[i].d_conf);
 302                 fill_cplbtab(t, a_start,
 303                                 a_end, SIZE_4M,
 304                                 cplb_data[i].d_conf);
 305                 fill_cplbtab(t, a_end,
 306                                 cplb_data[i].end,
 307                                 SIZE_1M,
 308                                 cplb_data[i].d_conf);
 309         }
 310 }
 311
 312 void __init generate_cplb_tables(void)
 313 {
 314
 315         u16 i, j, process;
 316         u32 a_start, a_end, as, ae, as_1m;
 317
 318         struct cplb_tab *t_i = NULL;
 319         struct cplb_tab *t_d = NULL;
 320         struct s_cplb cplb;
 321
 322         printk(KERN_INFO "NOMPU: setting up cplb tables for global access\n");
 323
 324         cplb.init_i.size = MAX_CPLBS;
 325         cplb.init_d.size = MAX_CPLBS;
 326         cplb.switch_i.size = MAX_SWITCH_I_CPLBS;
 327         cplb.switch_d.size = MAX_SWITCH_D_CPLBS;
 328
 329         cplb.init_i.pos = 0;
 330         cplb.init_d.pos = 0;
 331         cplb.switch_i.pos = 0;
 332         cplb.switch_d.pos = 0;
 333
 334         cplb.init_i.tab = icplb_table;
 335         cplb.init_d.tab = dcplb_table;
 336         cplb.switch_i.tab = ipdt_table;
 337         cplb.switch_d.tab = dpdt_table;
 338
 339         cplb_data[SDRAM_KERN].end = memory_end;
 340
 341 #ifdef CONFIG_MTD_UCLINUX
 342         cplb_data[SDRAM_RAM_MTD].start = memory_mtd_start;
 343         cplb_data[SDRAM_RAM_MTD].end = memory_mtd_start + mtd_size;
 344         cplb_data[SDRAM_RAM_MTD].valid = mtd_size > 0;
 345 # if defined(CONFIG_ROMFS_FS)
 346         cplb_data[SDRAM_RAM_MTD].attr |= I_CPLB;
 347
 348         /*
 349          * The ROMFS_FS size is often not multiple of 1MB.
 350          * This can cause multiple CPLB sets covering the same memory area.
 351          * This will then cause multiple CPLB hit exceptions.
 352          * Workaround: We ensure a contiguous memory area by extending the kernel
 353          * memory section over the mtd section.
 354          * For ROMFS_FS memory must be covered with ICPLBs anyways.
 355          * So there is no difference between kernel and mtd memory setup.
 356          */
 357
 358         cplb_data[SDRAM_KERN].end = memory_mtd_start + mtd_size;;
 359         cplb_data[SDRAM_RAM_MTD].valid = 0;
 360
 361 # endif
 362 #else
 363         cplb_data[SDRAM_RAM_MTD].valid = 0;
 364 #endif
 365
 366         cplb_data[SDRAM_DMAZ].start = _ramend - DMA_UNCACHED_REGION;
 367         cplb_data[SDRAM_DMAZ].end = _ramend;
 368
 369         cplb_data[RES_MEM].start = _ramend;
 370         cplb_data[RES_MEM].end = physical_mem_end;
 371
 372         if (reserved_mem_dcache_on)
 373                 cplb_data[RES_MEM].d_conf = SDRAM_DGENERIC;
 374         else
 375                 cplb_data[RES_MEM].d_conf = SDRAM_DNON_CHBL;
 376
 377         if (reserved_mem_icache_on)
 378                 cplb_data[RES_MEM].i_conf = SDRAM_IGENERIC;
 379         else
 380                 cplb_data[RES_MEM].i_conf = SDRAM_INON_CHBL;
 381
 382         for (i = ZERO_P; i < ARRAY_SIZE(cplb_data); ++i) {
 383                 if (!cplb_data[i].valid)
 384                         continue;
 385
 386                 as_1m = cplb_data[i].start % SIZE_1M;
 387
 388                 /* We need to make sure all sections are properly 1M aligned
 389                  * However between Kernel Memory and the Kernel mtd section, depending on the
 390                  * rootfs size, there can be overlapping memory areas.
 391                  */
 392
 393                 if (as_1m && i != L1I_MEM && i != L1D_MEM) {
 394 #ifdef CONFIG_MTD_UCLINUX
 395                         if (i == SDRAM_RAM_MTD) {
 396                                 if ((cplb_data[SDRAM_KERN].end + 1) > cplb_data[SDRAM_RAM_MTD].start)
 397                                         cplb_data[SDRAM_RAM_MTD].start = (cplb_data[i].start & (-2*SIZE_1M)) + SIZE_1M;
 398                                 else
 399                                         cplb_data[SDRAM_RAM_MTD].start = (cplb_data[i].start & (-2*SIZE_1M));
 400                         } else
 401 #endif
 402                                 printk(KERN_WARNING "Unaligned Start of %s at 0x%X\n",
 403                                        cplb_data[i].name, cplb_data[i].start);
 404                 }
 405
 406                 as = cplb_data[i].start % SIZE_4M;
 407                 ae = cplb_data[i].end % SIZE_4M;
 408
 409                 if (as)
 410                         a_start = cplb_data[i].start + (SIZE_4M - (as));
 411                 else
 412                         a_start = cplb_data[i].start;
 413
 414                 a_end = cplb_data[i].end - ae;
 415
 416                 for (j = INITIAL_T; j <= SWITCH_T; j++) {
 417
 418                         switch (j) {
 419                         case INITIAL_T:
 420                                 if (cplb_data[i].attr & INITIAL_T) {
 421                                         t_i = &cplb.init_i;
 422                                         t_d = &cplb.init_d;
 423                                         process = 1;
 424                                 } else
 425                                         process = 0;
 426                                 break;
 427                         case SWITCH_T:
 428                                 if (cplb_data[i].attr & SWITCH_T) {
 429                                         t_i = &cplb.switch_i;
 430                                         t_d = &cplb.switch_d;
 431                                         process = 1;
 432                                 } else
 433                                         process = 0;
 434                                 break;
 435                         default:
 436                                         process = 0;
 437                                 break;
 438                         }
 439
 440                         if (!process)
 441                                 continue;
 442                         if (cplb_data[i].attr & I_CPLB)
 443                                 __fill_code_cplbtab(t_i, i, a_start, a_end);
 444
 445                         if (cplb_data[i].attr & D_CPLB)
 446                                 __fill_data_cplbtab(t_d, i, a_start, a_end);
 447                 }
 448         }
 449
 450 /* close tables */
 451
 452         close_cplbtab(&cplb.init_i);
 453         close_cplbtab(&cplb.init_d);
 454
 455         cplb.init_i.tab[cplb.init_i.pos] = -1;
 456         cplb.init_d.tab[cplb.init_d.pos] = -1;
 457         cplb.switch_i.tab[cplb.switch_i.pos] = -1;
 458         cplb.switch_d.tab[cplb.switch_d.pos] = -1;
 459
 460 }
 461
 462 #endif
 463