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   1 /*
   2  * File:         arch/blackfin/mm/sram-alloc.c
   3  * Based on:
   4  * Author:
   5  *
   6  * Created:
   7  * Description:  SRAM allocator for Blackfin L1 and L2 memory
   8  *
   9  * Modified:
  10  *               Copyright 2004-2008 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/miscdevice.h>
  34 #include <linux/ioport.h>
  35 #include <linux/fcntl.h>
  36 #include <linux/init.h>
  37 #include <linux/poll.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/rtc.h>
  41 #include <asm/blackfin.h>
  42 #include <asm/mem_map.h>
  43 #include "blackfin_sram.h"
  44
  45 static DEFINE_PER_CPU(spinlock_t, l1sram_lock) ____cacheline_aligned_in_smp;
  46 static DEFINE_PER_CPU(spinlock_t, l1_data_sram_lock) ____cacheline_aligned_in_smp;
  47 static DEFINE_PER_CPU(spinlock_t, l1_inst_sram_lock) ____cacheline_aligned_in_smp;
  48 static spinlock_t l2_sram_lock ____cacheline_aligned_in_smp;
  49
  50 /* the data structure for L1 scratchpad and DATA SRAM */
  51 struct sram_piece {
  52         void *paddr;
  53         int size;
  54         pid_t pid;
  55         struct sram_piece *next;
  56 };
  57
  58 static DEFINE_PER_CPU(struct sram_piece, free_l1_ssram_head);
  59 static DEFINE_PER_CPU(struct sram_piece, used_l1_ssram_head);
  60
  61 #if L1_DATA_A_LENGTH != 0
  62 static DEFINE_PER_CPU(struct sram_piece, free_l1_data_A_sram_head);
  63 static DEFINE_PER_CPU(struct sram_piece, used_l1_data_A_sram_head);
  64 #endif
  65
  66 #if L1_DATA_B_LENGTH != 0
  67 static DEFINE_PER_CPU(struct sram_piece, free_l1_data_B_sram_head);
  68 static DEFINE_PER_CPU(struct sram_piece, used_l1_data_B_sram_head);
  69 #endif
  70
  71 #if L1_CODE_LENGTH != 0
  72 static DEFINE_PER_CPU(struct sram_piece, free_l1_inst_sram_head);
  73 static DEFINE_PER_CPU(struct sram_piece, used_l1_inst_sram_head);
  74 #endif
  75
  76 #if L2_LENGTH != 0
  77 static struct sram_piece free_l2_sram_head, used_l2_sram_head;
  78 #endif
  79
  80 static struct kmem_cache *sram_piece_cache;
  81
  82 /* L1 Scratchpad SRAM initialization function */
  83 static void __init l1sram_init(void)
  84 {
  85         unsigned int cpu;
  86         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
  87                 per_cpu(free_l1_ssram_head, cpu).next =
  88                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
  89                 if (!per_cpu(free_l1_ssram_head, cpu).next) {
  90                         printk(KERN_INFO "Fail to initialize Scratchpad data SRAM.\n");
  91                         return;
  92                 }
  93
  94                 per_cpu(free_l1_ssram_head, cpu).next->paddr = (void *)get_l1_scratch_start_cpu(cpu);
  95                 per_cpu(free_l1_ssram_head, cpu).next->size = L1_SCRATCH_LENGTH;
  96                 per_cpu(free_l1_ssram_head, cpu).next->pid = 0;
  97                 per_cpu(free_l1_ssram_head, cpu).next->next = NULL;
  98
  99                 per_cpu(used_l1_ssram_head, cpu).next = NULL;
 100
 101                 /* mutex initialize */
 102                 spin_lock_init(&per_cpu(l1sram_lock, cpu));
 103                 printk(KERN_INFO "Blackfin Scratchpad data SRAM: %d KB\n",
 104                         L1_SCRATCH_LENGTH >> 10);
 105         }
 106 }
 107
 108 static void __init l1_data_sram_init(void)
 109 {
 110 #if L1_DATA_A_LENGTH != 0 || L1_DATA_B_LENGTH != 0
 111         unsigned int cpu;
 112 #endif
 113 #if L1_DATA_A_LENGTH != 0
 114         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 115                 per_cpu(free_l1_data_A_sram_head, cpu).next =
 116                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 117                 if (!per_cpu(free_l1_data_A_sram_head, cpu).next) {
 118                         printk(KERN_INFO "Fail to initialize L1 Data A SRAM.\n");
 119                         return;
 120                 }
 121
 122                 per_cpu(free_l1_data_A_sram_head, cpu).next->paddr =
 123                         (void *)get_l1_data_a_start_cpu(cpu) + (_ebss_l1 - _sdata_l1);
 124                 per_cpu(free_l1_data_A_sram_head, cpu).next->size =
 125                         L1_DATA_A_LENGTH - (_ebss_l1 - _sdata_l1);
 126                 per_cpu(free_l1_data_A_sram_head, cpu).next->pid = 0;
 127                 per_cpu(free_l1_data_A_sram_head, cpu).next->next = NULL;
 128
 129                 per_cpu(used_l1_data_A_sram_head, cpu).next = NULL;
 130
 131                 printk(KERN_INFO "Blackfin L1 Data A SRAM: %d KB (%d KB free)\n",
 132                         L1_DATA_A_LENGTH >> 10,
 133                         per_cpu(free_l1_data_A_sram_head, cpu).next->size >> 10);
 134         }
 135 #endif
 136 #if L1_DATA_B_LENGTH != 0
 137         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 138                 per_cpu(free_l1_data_B_sram_head, cpu).next =
 139                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 140                 if (!per_cpu(free_l1_data_B_sram_head, cpu).next) {
 141                         printk(KERN_INFO "Fail to initialize L1 Data B SRAM.\n");
 142                         return;
 143                 }
 144
 145                 per_cpu(free_l1_data_B_sram_head, cpu).next->paddr =
 146                         (void *)get_l1_data_b_start_cpu(cpu) + (_ebss_b_l1 - _sdata_b_l1);
 147                 per_cpu(free_l1_data_B_sram_head, cpu).next->size =
 148                         L1_DATA_B_LENGTH - (_ebss_b_l1 - _sdata_b_l1);
 149                 per_cpu(free_l1_data_B_sram_head, cpu).next->pid = 0;
 150                 per_cpu(free_l1_data_B_sram_head, cpu).next->next = NULL;
 151
 152                 per_cpu(used_l1_data_B_sram_head, cpu).next = NULL;
 153
 154                 printk(KERN_INFO "Blackfin L1 Data B SRAM: %d KB (%d KB free)\n",
 155                         L1_DATA_B_LENGTH >> 10,
 156                         per_cpu(free_l1_data_B_sram_head, cpu).next->size >> 10);
 157                 /* mutex initialize */
 158         }
 159 #endif
 160
 161 #if L1_DATA_A_LENGTH != 0 || L1_DATA_B_LENGTH != 0
 162         for (cpu = 0; cpu < num_possible_cpus(); ++cpu)
 163                 spin_lock_init(&per_cpu(l1_data_sram_lock, cpu));
 164 #endif
 165 }
 166
 167 static void __init l1_inst_sram_init(void)
 168 {
 169 #if L1_CODE_LENGTH != 0
 170         unsigned int cpu;
 171         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 172                 per_cpu(free_l1_inst_sram_head, cpu).next =
 173                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 174                 if (!per_cpu(free_l1_inst_sram_head, cpu).next) {
 175                         printk(KERN_INFO "Failed to initialize L1 Instruction SRAM\n");
 176                         return;
 177                 }
 178
 179                 per_cpu(free_l1_inst_sram_head, cpu).next->paddr =
 180                         (void *)get_l1_code_start_cpu(cpu) + (_etext_l1 - _stext_l1);
 181                 per_cpu(free_l1_inst_sram_head, cpu).next->size =
 182                         L1_CODE_LENGTH - (_etext_l1 - _stext_l1);
 183                 per_cpu(free_l1_inst_sram_head, cpu).next->pid = 0;
 184                 per_cpu(free_l1_inst_sram_head, cpu).next->next = NULL;
 185
 186                 per_cpu(used_l1_inst_sram_head, cpu).next = NULL;
 187
 188                 printk(KERN_INFO "Blackfin L1 Instruction SRAM: %d KB (%d KB free)\n",
 189                         L1_CODE_LENGTH >> 10,
 190                         per_cpu(free_l1_inst_sram_head, cpu).next->size >> 10);
 191
 192                 /* mutex initialize */
 193                 spin_lock_init(&per_cpu(l1_inst_sram_lock, cpu));
 194         }
 195 #endif
 196 }
 197
 198 static void __init l2_sram_init(void)
 199 {
 200 #if L2_LENGTH != 0
 201         free_l2_sram_head.next =
 202                 kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 203         if (!free_l2_sram_head.next) {
 204                 printk(KERN_INFO "Fail to initialize L2 SRAM.\n");
 205                 return;
 206         }
 207
 208         free_l2_sram_head.next->paddr =
 209                 (void *)L2_START + (_ebss_l2 - _stext_l2);
 210         free_l2_sram_head.next->size =
 211                 L2_LENGTH - (_ebss_l2 - _stext_l2);
 212         free_l2_sram_head.next->pid = 0;
 213         free_l2_sram_head.next->next = NULL;
 214
 215         used_l2_sram_head.next = NULL;
 216
 217         printk(KERN_INFO "Blackfin L2 SRAM: %d KB (%d KB free)\n",
 218                 L2_LENGTH >> 10,
 219                 free_l2_sram_head.next->size >> 10);
 220 #endif
 221
 222         /* mutex initialize */
 223         spin_lock_init(&l2_sram_lock);
 224 }
 225
 226 void __init bfin_sram_init(void)
 227 {
 228         sram_piece_cache = kmem_cache_create("sram_piece_cache",
 229                                 sizeof(struct sram_piece),
 230                                 0, SLAB_PANIC, NULL);
 231
 232         l1sram_init();
 233         l1_data_sram_init();
 234         l1_inst_sram_init();
 235         l2_sram_init();
 236 }
 237
 238 /* SRAM allocate function */
 239 static void *_sram_alloc(size_t size, struct sram_piece *pfree_head,
 240                 struct sram_piece *pused_head)
 241 {
 242         struct sram_piece *pslot, *plast, *pavail;
 243
 244         if (size <= 0 || !pfree_head || !pused_head)
 245                 return NULL;
 246
 247         /* Align the size */
 248         size = (size + 3) & ~3;
 249
 250         pslot = pfree_head->next;
 251         plast = pfree_head;
 252
 253         /* search an available piece slot */
 254         while (pslot != NULL && size > pslot->size) {
 255                 plast = pslot;
 256                 pslot = pslot->next;
 257         }
 258
 259         if (!pslot)
 260                 return NULL;
 261
 262         if (pslot->size == size) {
 263                 plast->next = pslot->next;
 264                 pavail = pslot;
 265         } else {
 266                 pavail = kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 267
 268                 if (!pavail)
 269                         return NULL;
 270
 271                 pavail->paddr = pslot->paddr;
 272                 pavail->size = size;
 273                 pslot->paddr += size;
 274                 pslot->size -= size;
 275         }
 276
 277         pavail->pid = current->pid;
 278
 279         pslot = pused_head->next;
 280         plast = pused_head;
 281
 282         /* insert new piece into used piece list !!! */
 283         while (pslot != NULL && pavail->paddr < pslot->paddr) {
 284                 plast = pslot;
 285                 pslot = pslot->next;
 286         }
 287
 288         pavail->next = pslot;
 289         plast->next = pavail;
 290
 291         return pavail->paddr;
 292 }
 293
 294 /* Allocate the largest available block.  */
 295 static void *_sram_alloc_max(struct sram_piece *pfree_head,
 296                                 struct sram_piece *pused_head,
 297                                 unsigned long *psize)
 298 {
 299         struct sram_piece *pslot, *pmax;
 300
 301         if (!pfree_head || !pused_head)
 302                 return NULL;
 303
 304         pmax = pslot = pfree_head->next;
 305
 306         /* search an available piece slot */
 307         while (pslot != NULL) {
 308                 if (pslot->size > pmax->size)
 309                         pmax = pslot;
 310                 pslot = pslot->next;
 311         }
 312
 313         if (!pmax)
 314                 return NULL;
 315
 316         *psize = pmax->size;
 317
 318         return _sram_alloc(*psize, pfree_head, pused_head);
 319 }
 320
 321 /* SRAM free function */
 322 static int _sram_free(const void *addr,
 323                         struct sram_piece *pfree_head,
 324                         struct sram_piece *pused_head)
 325 {
 326         struct sram_piece *pslot, *plast, *pavail;
 327
 328         if (!pfree_head || !pused_head)
 329                 return -1;
 330
 331         /* search the relevant memory slot */
 332         pslot = pused_head->next;
 333         plast = pused_head;
 334
 335         /* search an available piece slot */
 336         while (pslot != NULL && pslot->paddr != addr) {
 337                 plast = pslot;
 338                 pslot = pslot->next;
 339         }
 340
 341         if (!pslot)
 342                 return -1;
 343
 344         plast->next = pslot->next;
 345         pavail = pslot;
 346         pavail->pid = 0;
 347
 348         /* insert free pieces back to the free list */
 349         pslot = pfree_head->next;
 350         plast = pfree_head;
 351
 352         while (pslot != NULL && addr > pslot->paddr) {
 353                 plast = pslot;
 354                 pslot = pslot->next;
 355         }
 356
 357         if (plast != pfree_head && plast->paddr + plast->size == pavail->paddr) {
 358                 plast->size += pavail->size;
 359                 kmem_cache_free(sram_piece_cache, pavail);
 360         } else {
 361                 pavail->next = plast->next;
 362                 plast->next = pavail;
 363                 plast = pavail;
 364         }
 365
 366         if (pslot && plast->paddr + plast->size == pslot->paddr) {
 367                 plast->size += pslot->size;
 368                 plast->next = pslot->next;
 369                 kmem_cache_free(sram_piece_cache, pslot);
 370         }
 371
 372         return 0;
 373 }
 374
 375 int sram_free(const void *addr)
 376 {
 377
 378 #if L1_CODE_LENGTH != 0
 379         if (addr >= (void *)get_l1_code_start()
 380                  && addr < (void *)(get_l1_code_start() + L1_CODE_LENGTH))
 381                 return l1_inst_sram_free(addr);
 382         else
 383 #endif
 384 #if L1_DATA_A_LENGTH != 0
 385         if (addr >= (void *)get_l1_data_a_start()
 386                  && addr < (void *)(get_l1_data_a_start() + L1_DATA_A_LENGTH))
 387                 return l1_data_A_sram_free(addr);
 388         else
 389 #endif
 390 #if L1_DATA_B_LENGTH != 0
 391         if (addr >= (void *)get_l1_data_b_start()
 392                  && addr < (void *)(get_l1_data_b_start() + L1_DATA_B_LENGTH))
 393                 return l1_data_B_sram_free(addr);
 394         else
 395 #endif
 396 #if L2_LENGTH != 0
 397         if (addr >= (void *)L2_START
 398                  && addr < (void *)(L2_START + L2_LENGTH))
 399                 return l2_sram_free(addr);
 400         else
 401 #endif
 402                 return -1;
 403 }
 404 EXPORT_SYMBOL(sram_free);
 405
 406 void *l1_data_A_sram_alloc(size_t size)
 407 {
 408         unsigned long flags;
 409         void *addr = NULL;
 410         unsigned int cpu;
 411
 412         cpu = get_cpu();
 413         /* add mutex operation */
 414         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 415
 416 #if L1_DATA_A_LENGTH != 0
 417         addr = _sram_alloc(size, &per_cpu(free_l1_data_A_sram_head, cpu),
 418                         &per_cpu(used_l1_data_A_sram_head, cpu));
 419 #endif
 420
 421         /* add mutex operation */
 422         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 423         put_cpu();
 424
 425         pr_debug("Allocated address in l1_data_A_sram_alloc is 0x%lx+0x%lx\n",
 426                  (long unsigned int)addr, size);
 427
 428         return addr;
 429 }
 430 EXPORT_SYMBOL(l1_data_A_sram_alloc);
 431
 432 int l1_data_A_sram_free(const void *addr)
 433 {
 434         unsigned long flags;
 435         int ret;
 436         unsigned int cpu;
 437
 438         cpu = get_cpu();
 439         /* add mutex operation */
 440         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 441
 442 #if L1_DATA_A_LENGTH != 0
 443         ret = _sram_free(addr, &per_cpu(free_l1_data_A_sram_head, cpu),
 444                         &per_cpu(used_l1_data_A_sram_head, cpu));
 445 #else
 446         ret = -1;
 447 #endif
 448
 449         /* add mutex operation */
 450         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 451         put_cpu();
 452
 453         return ret;
 454 }
 455 EXPORT_SYMBOL(l1_data_A_sram_free);
 456
 457 void *l1_data_B_sram_alloc(size_t size)
 458 {
 459 #if L1_DATA_B_LENGTH != 0
 460         unsigned long flags;
 461         void *addr;
 462         unsigned int cpu;
 463
 464         cpu = get_cpu();
 465         /* add mutex operation */
 466         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 467
 468         addr = _sram_alloc(size, &per_cpu(free_l1_data_B_sram_head, cpu),
 469                         &per_cpu(used_l1_data_B_sram_head, cpu));
 470
 471         /* add mutex operation */
 472         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 473         put_cpu();
 474
 475         pr_debug("Allocated address in l1_data_B_sram_alloc is 0x%lx+0x%lx\n",
 476                  (long unsigned int)addr, size);
 477
 478         return addr;
 479 #else
 480         return NULL;
 481 #endif
 482 }
 483 EXPORT_SYMBOL(l1_data_B_sram_alloc);
 484
 485 int l1_data_B_sram_free(const void *addr)
 486 {
 487 #if L1_DATA_B_LENGTH != 0
 488         unsigned long flags;
 489         int ret;
 490         unsigned int cpu;
 491
 492         cpu = get_cpu();
 493         /* add mutex operation */
 494         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 495
 496         ret = _sram_free(addr, &per_cpu(free_l1_data_B_sram_head, cpu),
 497                         &per_cpu(used_l1_data_B_sram_head, cpu));
 498
 499         /* add mutex operation */
 500         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 501         put_cpu();
 502
 503         return ret;
 504 #else
 505         return -1;
 506 #endif
 507 }
 508 EXPORT_SYMBOL(l1_data_B_sram_free);
 509
 510 void *l1_data_sram_alloc(size_t size)
 511 {
 512         void *addr = l1_data_A_sram_alloc(size);
 513
 514         if (!addr)
 515                 addr = l1_data_B_sram_alloc(size);
 516
 517         return addr;
 518 }
 519 EXPORT_SYMBOL(l1_data_sram_alloc);
 520
 521 void *l1_data_sram_zalloc(size_t size)
 522 {
 523         void *addr = l1_data_sram_alloc(size);
 524
 525         if (addr)
 526                 memset(addr, 0x00, size);
 527
 528         return addr;
 529 }
 530 EXPORT_SYMBOL(l1_data_sram_zalloc);
 531
 532 int l1_data_sram_free(const void *addr)
 533 {
 534         int ret;
 535         ret = l1_data_A_sram_free(addr);
 536         if (ret == -1)
 537                 ret = l1_data_B_sram_free(addr);
 538         return ret;
 539 }
 540 EXPORT_SYMBOL(l1_data_sram_free);
 541
 542 void *l1_inst_sram_alloc(size_t size)
 543 {
 544 #if L1_CODE_LENGTH != 0
 545         unsigned long flags;
 546         void *addr;
 547         unsigned int cpu;
 548
 549         cpu = get_cpu();
 550         /* add mutex operation */
 551         spin_lock_irqsave(&per_cpu(l1_inst_sram_lock, cpu), flags);
 552
 553         addr = _sram_alloc(size, &per_cpu(free_l1_inst_sram_head, cpu),
 554                         &per_cpu(used_l1_inst_sram_head, cpu));
 555
 556         /* add mutex operation */
 557         spin_unlock_irqrestore(&per_cpu(l1_inst_sram_lock, cpu), flags);
 558         put_cpu();
 559
 560         pr_debug("Allocated address in l1_inst_sram_alloc is 0x%lx+0x%lx\n",
 561                  (long unsigned int)addr, size);
 562
 563         return addr;
 564 #else
 565         return NULL;
 566 #endif
 567 }
 568 EXPORT_SYMBOL(l1_inst_sram_alloc);
 569
 570 int l1_inst_sram_free(const void *addr)
 571 {
 572 #if L1_CODE_LENGTH != 0
 573         unsigned long flags;
 574         int ret;
 575         unsigned int cpu;
 576
 577         cpu = get_cpu();
 578         /* add mutex operation */
 579         spin_lock_irqsave(&per_cpu(l1_inst_sram_lock, cpu), flags);
 580
 581         ret = _sram_free(addr, &per_cpu(free_l1_inst_sram_head, cpu),
 582                         &per_cpu(used_l1_inst_sram_head, cpu));
 583
 584         /* add mutex operation */
 585         spin_unlock_irqrestore(&per_cpu(l1_inst_sram_lock, cpu), flags);
 586         put_cpu();
 587
 588         return ret;
 589 #else
 590         return -1;
 591 #endif
 592 }
 593 EXPORT_SYMBOL(l1_inst_sram_free);
 594
 595 /* L1 Scratchpad memory allocate function */
 596 void *l1sram_alloc(size_t size)
 597 {
 598         unsigned long flags;
 599         void *addr;
 600         unsigned int cpu;
 601
 602         cpu = get_cpu();
 603         /* add mutex operation */
 604         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 605
 606         addr = _sram_alloc(size, &per_cpu(free_l1_ssram_head, cpu),
 607                         &per_cpu(used_l1_ssram_head, cpu));
 608
 609         /* add mutex operation */
 610         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 611         put_cpu();
 612
 613         return addr;
 614 }
 615
 616 /* L1 Scratchpad memory allocate function */
 617 void *l1sram_alloc_max(size_t *psize)
 618 {
 619         unsigned long flags;
 620         void *addr;
 621         unsigned int cpu;
 622
 623         cpu = get_cpu();
 624         /* add mutex operation */
 625         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 626
 627         addr = _sram_alloc_max(&per_cpu(free_l1_ssram_head, cpu),
 628                         &per_cpu(used_l1_ssram_head, cpu), psize);
 629
 630         /* add mutex operation */
 631         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 632         put_cpu();
 633
 634         return addr;
 635 }
 636
 637 /* L1 Scratchpad memory free function */
 638 int l1sram_free(const void *addr)
 639 {
 640         unsigned long flags;
 641         int ret;
 642         unsigned int cpu;
 643
 644         cpu = get_cpu();
 645         /* add mutex operation */
 646         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 647
 648         ret = _sram_free(addr, &per_cpu(free_l1_ssram_head, cpu),
 649                         &per_cpu(used_l1_ssram_head, cpu));
 650
 651         /* add mutex operation */
 652         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 653         put_cpu();
 654
 655         return ret;
 656 }
 657
 658 void *l2_sram_alloc(size_t size)
 659 {
 660 #if L2_LENGTH != 0
 661         unsigned long flags;
 662         void *addr;
 663
 664         /* add mutex operation */
 665         spin_lock_irqsave(&l2_sram_lock, flags);
 666
 667         addr = _sram_alloc(size, &free_l2_sram_head,
 668                         &used_l2_sram_head);
 669
 670         /* add mutex operation */
 671         spin_unlock_irqrestore(&l2_sram_lock, flags);
 672
 673         pr_debug("Allocated address in l2_sram_alloc is 0x%lx+0x%lx\n",
 674                  (long unsigned int)addr, size);
 675
 676         return addr;
 677 #else
 678         return NULL;
 679 #endif
 680 }
 681 EXPORT_SYMBOL(l2_sram_alloc);
 682
 683 void *l2_sram_zalloc(size_t size)
 684 {
 685         void *addr = l2_sram_alloc(size);
 686
 687         if (addr)
 688                 memset(addr, 0x00, size);
 689
 690         return addr;
 691 }
 692 EXPORT_SYMBOL(l2_sram_zalloc);
 693
 694 int l2_sram_free(const void *addr)
 695 {
 696 #if L2_LENGTH != 0
 697         unsigned long flags;
 698         int ret;
 699
 700         /* add mutex operation */
 701         spin_lock_irqsave(&l2_sram_lock, flags);
 702
 703         ret = _sram_free(addr, &free_l2_sram_head,
 704                         &used_l2_sram_head);
 705
 706         /* add mutex operation */
 707         spin_unlock_irqrestore(&l2_sram_lock, flags);
 708
 709         return ret;
 710 #else
 711         return -1;
 712 #endif
 713 }
 714 EXPORT_SYMBOL(l2_sram_free);
 715
 716 int sram_free_with_lsl(const void *addr)
 717 {
 718         struct sram_list_struct *lsl, **tmp;
 719         struct mm_struct *mm = current->mm;
 720
 721         for (tmp = &mm->context.sram_list; *tmp; tmp = &(*tmp)->next)
 722                 if ((*tmp)->addr == addr)
 723                         goto found;
 724         return -1;
 725 found:
 726         lsl = *tmp;
 727         sram_free(addr);
 728         *tmp = lsl->next;
 729         kfree(lsl);
 730
 731         return 0;
 732 }
 733 EXPORT_SYMBOL(sram_free_with_lsl);
 734
 735 void *sram_alloc_with_lsl(size_t size, unsigned long flags)
 736 {
 737         void *addr = NULL;
 738         struct sram_list_struct *lsl = NULL;
 739         struct mm_struct *mm = current->mm;
 740
 741         lsl = kzalloc(sizeof(struct sram_list_struct), GFP_KERNEL);
 742         if (!lsl)
 743                 return NULL;
 744
 745         if (flags & L1_INST_SRAM)
 746                 addr = l1_inst_sram_alloc(size);
 747
 748         if (addr == NULL && (flags & L1_DATA_A_SRAM))
 749                 addr = l1_data_A_sram_alloc(size);
 750
 751         if (addr == NULL && (flags & L1_DATA_B_SRAM))
 752                 addr = l1_data_B_sram_alloc(size);
 753
 754         if (addr == NULL && (flags & L2_SRAM))
 755                 addr = l2_sram_alloc(size);
 756
 757         if (addr == NULL) {
 758                 kfree(lsl);
 759                 return NULL;
 760         }
 761         lsl->addr = addr;
 762         lsl->length = size;
 763         lsl->next = mm->context.sram_list;
 764         mm->context.sram_list = lsl;
 765         return addr;
 766 }
 767 EXPORT_SYMBOL(sram_alloc_with_lsl);
 768
 769 #ifdef CONFIG_PROC_FS
 770 /* Once we get a real allocator, we'll throw all of this away.
 771  * Until then, we need some sort of visibility into the L1 alloc.
 772  */
 773 /* Need to keep line of output the same.  Currently, that is 44 bytes
 774  * (including newline).
 775  */
 776 static int _sram_proc_read(char *buf, int *len, int count, const char *desc,
 777                 struct sram_piece *pfree_head,
 778                 struct sram_piece *pused_head)
 779 {
 780         struct sram_piece *pslot;
 781
 782         if (!pfree_head || !pused_head)
 783                 return -1;
 784
 785         *len += sprintf(&buf[*len], "--- SRAM %-14s Size   PID State     \n", desc);
 786
 787         /* search the relevant memory slot */
 788         pslot = pused_head->next;
 789
 790         while (pslot != NULL) {
 791                 *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 792                         pslot->paddr, pslot->paddr + pslot->size,
 793                         pslot->size, pslot->pid, "ALLOCATED");
 794
 795                 pslot = pslot->next;
 796         }
 797
 798         pslot = pfree_head->next;
 799
 800         while (pslot != NULL) {
 801                 *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 802                         pslot->paddr, pslot->paddr + pslot->size,
 803                         pslot->size, pslot->pid, "FREE");
 804
 805                 pslot = pslot->next;
 806         }
 807
 808         return 0;
 809 }
 810 static int sram_proc_read(char *buf, char **start, off_t offset, int count,
 811                 int *eof, void *data)
 812 {
 813         int len = 0;
 814         unsigned int cpu;
 815
 816         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 817                 if (_sram_proc_read(buf, &len, count, "Scratchpad",
 818                         &per_cpu(free_l1_ssram_head, cpu), &per_cpu(used_l1_ssram_head, cpu)))
 819                         goto not_done;
 820 #if L1_DATA_A_LENGTH != 0
 821                 if (_sram_proc_read(buf, &len, count, "L1 Data A",
 822                         &per_cpu(free_l1_data_A_sram_head, cpu),
 823                         &per_cpu(used_l1_data_A_sram_head, cpu)))
 824                         goto not_done;
 825 #endif
 826 #if L1_DATA_B_LENGTH != 0
 827                 if (_sram_proc_read(buf, &len, count, "L1 Data B",
 828                         &per_cpu(free_l1_data_B_sram_head, cpu),
 829                         &per_cpu(used_l1_data_B_sram_head, cpu)))
 830                         goto not_done;
 831 #endif
 832 #if L1_CODE_LENGTH != 0
 833                 if (_sram_proc_read(buf, &len, count, "L1 Instruction",
 834                         &per_cpu(free_l1_inst_sram_head, cpu),
 835                         &per_cpu(used_l1_inst_sram_head, cpu)))
 836                         goto not_done;
 837 #endif
 838         }
 839 #if L2_LENGTH != 0
 840         if (_sram_proc_read(buf, &len, count, "L2", &free_l2_sram_head,
 841                 &used_l2_sram_head))
 842                 goto not_done;
 843 #endif
 844         *eof = 1;
 845  not_done:
 846         return len;
 847 }
 848
 849 static int __init sram_proc_init(void)
 850 {
 851         struct proc_dir_entry *ptr;
 852         ptr = create_proc_entry("sram", S_IFREG | S_IRUGO, NULL);
 853         if (!ptr) {
 854                 printk(KERN_WARNING "unable to create /proc/sram\n");
 855                 return -1;
 856         }
 857         ptr->owner = THIS_MODULE;
 858         ptr->read_proc = sram_proc_read;
 859         return 0;
 860 }
 861 late_initcall(sram_proc_init);
 862 #endif