arch/blackfin/mm/sram-alloc.c

   1 /*
   2  * SRAM allocator for Blackfin on-chip memory
   3  *
   4  * Copyright 2004-2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/types.h>
  12 #include <linux/miscdevice.h>
  13 #include <linux/ioport.h>
  14 #include <linux/fcntl.h>
  15 #include <linux/init.h>
  16 #include <linux/poll.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/rtc.h>
  20 #include <asm/blackfin.h>
  21 #include <asm/mem_map.h>
  22 #include "blackfin_sram.h"
  23
  24 /* the data structure for L1 scratchpad and DATA SRAM */
  25 struct sram_piece {
  26         void *paddr;
  27         int size;
  28         pid_t pid;
  29         struct sram_piece *next;
  30 };
  31
  32 static DEFINE_PER_CPU_SHARED_ALIGNED(spinlock_t, l1sram_lock);
  33 static DEFINE_PER_CPU(struct sram_piece, free_l1_ssram_head);
  34 static DEFINE_PER_CPU(struct sram_piece, used_l1_ssram_head);
  35
  36 #if L1_DATA_A_LENGTH != 0
  37 static DEFINE_PER_CPU(struct sram_piece, free_l1_data_A_sram_head);
  38 static DEFINE_PER_CPU(struct sram_piece, used_l1_data_A_sram_head);
  39 #endif
  40
  41 #if L1_DATA_B_LENGTH != 0
  42 static DEFINE_PER_CPU(struct sram_piece, free_l1_data_B_sram_head);
  43 static DEFINE_PER_CPU(struct sram_piece, used_l1_data_B_sram_head);
  44 #endif
  45
  46 #if L1_DATA_A_LENGTH || L1_DATA_B_LENGTH
  47 static DEFINE_PER_CPU_SHARED_ALIGNED(spinlock_t, l1_data_sram_lock);
  48 #endif
  49
  50 #if L1_CODE_LENGTH != 0
  51 static DEFINE_PER_CPU_SHARED_ALIGNED(spinlock_t, l1_inst_sram_lock);
  52 static DEFINE_PER_CPU(struct sram_piece, free_l1_inst_sram_head);
  53 static DEFINE_PER_CPU(struct sram_piece, used_l1_inst_sram_head);
  54 #endif
  55
  56 #if L2_LENGTH != 0
  57 static spinlock_t l2_sram_lock ____cacheline_aligned_in_smp;
  58 static struct sram_piece free_l2_sram_head, used_l2_sram_head;
  59 #endif
  60
  61 static struct kmem_cache *sram_piece_cache;
  62
  63 /* L1 Scratchpad SRAM initialization function */
  64 static void __init l1sram_init(void)
  65 {
  66         unsigned int cpu;
  67         unsigned long reserve;
  68
  69 #ifdef CONFIG_SMP
  70         reserve = 0;
  71 #else
  72         reserve = sizeof(struct l1_scratch_task_info);
  73 #endif
  74
  75         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
  76                 per_cpu(free_l1_ssram_head, cpu).next =
  77                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
  78                 if (!per_cpu(free_l1_ssram_head, cpu).next) {
  79                         printk(KERN_INFO "Fail to initialize Scratchpad data SRAM.\n");
  80                         return;
  81                 }
  82
  83                 per_cpu(free_l1_ssram_head, cpu).next->paddr = (void *)get_l1_scratch_start_cpu(cpu) + reserve;
  84                 per_cpu(free_l1_ssram_head, cpu).next->size = L1_SCRATCH_LENGTH - reserve;
  85                 per_cpu(free_l1_ssram_head, cpu).next->pid = 0;
  86                 per_cpu(free_l1_ssram_head, cpu).next->next = NULL;
  87
  88                 per_cpu(used_l1_ssram_head, cpu).next = NULL;
  89
  90                 /* mutex initialize */
  91                 spin_lock_init(&per_cpu(l1sram_lock, cpu));
  92                 printk(KERN_INFO "Blackfin Scratchpad data SRAM: %d KB\n",
  93                         L1_SCRATCH_LENGTH >> 10);
  94         }
  95 }
  96
  97 static void __init l1_data_sram_init(void)
  98 {
  99 #if L1_DATA_A_LENGTH != 0 || L1_DATA_B_LENGTH != 0
 100         unsigned int cpu;
 101 #endif
 102 #if L1_DATA_A_LENGTH != 0
 103         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 104                 per_cpu(free_l1_data_A_sram_head, cpu).next =
 105                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 106                 if (!per_cpu(free_l1_data_A_sram_head, cpu).next) {
 107                         printk(KERN_INFO "Fail to initialize L1 Data A SRAM.\n");
 108                         return;
 109                 }
 110
 111                 per_cpu(free_l1_data_A_sram_head, cpu).next->paddr =
 112                         (void *)get_l1_data_a_start_cpu(cpu) + (_ebss_l1 - _sdata_l1);
 113                 per_cpu(free_l1_data_A_sram_head, cpu).next->size =
 114                         L1_DATA_A_LENGTH - (_ebss_l1 - _sdata_l1);
 115                 per_cpu(free_l1_data_A_sram_head, cpu).next->pid = 0;
 116                 per_cpu(free_l1_data_A_sram_head, cpu).next->next = NULL;
 117
 118                 per_cpu(used_l1_data_A_sram_head, cpu).next = NULL;
 119
 120                 printk(KERN_INFO "Blackfin L1 Data A SRAM: %d KB (%d KB free)\n",
 121                         L1_DATA_A_LENGTH >> 10,
 122                         per_cpu(free_l1_data_A_sram_head, cpu).next->size >> 10);
 123         }
 124 #endif
 125 #if L1_DATA_B_LENGTH != 0
 126         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 127                 per_cpu(free_l1_data_B_sram_head, cpu).next =
 128                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 129                 if (!per_cpu(free_l1_data_B_sram_head, cpu).next) {
 130                         printk(KERN_INFO "Fail to initialize L1 Data B SRAM.\n");
 131                         return;
 132                 }
 133
 134                 per_cpu(free_l1_data_B_sram_head, cpu).next->paddr =
 135                         (void *)get_l1_data_b_start_cpu(cpu) + (_ebss_b_l1 - _sdata_b_l1);
 136                 per_cpu(free_l1_data_B_sram_head, cpu).next->size =
 137                         L1_DATA_B_LENGTH - (_ebss_b_l1 - _sdata_b_l1);
 138                 per_cpu(free_l1_data_B_sram_head, cpu).next->pid = 0;
 139                 per_cpu(free_l1_data_B_sram_head, cpu).next->next = NULL;
 140
 141                 per_cpu(used_l1_data_B_sram_head, cpu).next = NULL;
 142
 143                 printk(KERN_INFO "Blackfin L1 Data B SRAM: %d KB (%d KB free)\n",
 144                         L1_DATA_B_LENGTH >> 10,
 145                         per_cpu(free_l1_data_B_sram_head, cpu).next->size >> 10);
 146                 /* mutex initialize */
 147         }
 148 #endif
 149
 150 #if L1_DATA_A_LENGTH != 0 || L1_DATA_B_LENGTH != 0
 151         for (cpu = 0; cpu < num_possible_cpus(); ++cpu)
 152                 spin_lock_init(&per_cpu(l1_data_sram_lock, cpu));
 153 #endif
 154 }
 155
 156 static void __init l1_inst_sram_init(void)
 157 {
 158 #if L1_CODE_LENGTH != 0
 159         unsigned int cpu;
 160         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 161                 per_cpu(free_l1_inst_sram_head, cpu).next =
 162                         kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 163                 if (!per_cpu(free_l1_inst_sram_head, cpu).next) {
 164                         printk(KERN_INFO "Failed to initialize L1 Instruction SRAM\n");
 165                         return;
 166                 }
 167
 168                 per_cpu(free_l1_inst_sram_head, cpu).next->paddr =
 169                         (void *)get_l1_code_start_cpu(cpu) + (_etext_l1 - _stext_l1);
 170                 per_cpu(free_l1_inst_sram_head, cpu).next->size =
 171                         L1_CODE_LENGTH - (_etext_l1 - _stext_l1);
 172                 per_cpu(free_l1_inst_sram_head, cpu).next->pid = 0;
 173                 per_cpu(free_l1_inst_sram_head, cpu).next->next = NULL;
 174
 175                 per_cpu(used_l1_inst_sram_head, cpu).next = NULL;
 176
 177                 printk(KERN_INFO "Blackfin L1 Instruction SRAM: %d KB (%d KB free)\n",
 178                         L1_CODE_LENGTH >> 10,
 179                         per_cpu(free_l1_inst_sram_head, cpu).next->size >> 10);
 180
 181                 /* mutex initialize */
 182                 spin_lock_init(&per_cpu(l1_inst_sram_lock, cpu));
 183         }
 184 #endif
 185 }
 186
 187 static void __init l2_sram_init(void)
 188 {
 189 #if L2_LENGTH != 0
 190         free_l2_sram_head.next =
 191                 kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 192         if (!free_l2_sram_head.next) {
 193                 printk(KERN_INFO "Fail to initialize L2 SRAM.\n");
 194                 return;
 195         }
 196
 197         free_l2_sram_head.next->paddr =
 198                 (void *)L2_START + (_ebss_l2 - _stext_l2);
 199         free_l2_sram_head.next->size =
 200                 L2_LENGTH - (_ebss_l2 - _stext_l2);
 201         free_l2_sram_head.next->pid = 0;
 202         free_l2_sram_head.next->next = NULL;
 203
 204         used_l2_sram_head.next = NULL;
 205
 206         printk(KERN_INFO "Blackfin L2 SRAM: %d KB (%d KB free)\n",
 207                 L2_LENGTH >> 10,
 208                 free_l2_sram_head.next->size >> 10);
 209
 210         /* mutex initialize */
 211         spin_lock_init(&l2_sram_lock);
 212 #endif
 213 }
 214
 215 static int __init bfin_sram_init(void)
 216 {
 217         sram_piece_cache = kmem_cache_create("sram_piece_cache",
 218                                 sizeof(struct sram_piece),
 219                                 0, SLAB_PANIC, NULL);
 220
 221         l1sram_init();
 222         l1_data_sram_init();
 223         l1_inst_sram_init();
 224         l2_sram_init();
 225
 226         return 0;
 227 }
 228 pure_initcall(bfin_sram_init);
 229
 230 /* SRAM allocate function */
 231 static void *_sram_alloc(size_t size, struct sram_piece *pfree_head,
 232                 struct sram_piece *pused_head)
 233 {
 234         struct sram_piece *pslot, *plast, *pavail;
 235
 236         if (size <= 0 || !pfree_head || !pused_head)
 237                 return NULL;
 238
 239         /* Align the size */
 240         size = (size + 3) & ~3;
 241
 242         pslot = pfree_head->next;
 243         plast = pfree_head;
 244
 245         /* search an available piece slot */
 246         while (pslot != NULL && size > pslot->size) {
 247                 plast = pslot;
 248                 pslot = pslot->next;
 249         }
 250
 251         if (!pslot)
 252                 return NULL;
 253
 254         if (pslot->size == size) {
 255                 plast->next = pslot->next;
 256                 pavail = pslot;
 257         } else {
 258                 pavail = kmem_cache_alloc(sram_piece_cache, GFP_KERNEL);
 259
 260                 if (!pavail)
 261                         return NULL;
 262
 263                 pavail->paddr = pslot->paddr;
 264                 pavail->size = size;
 265                 pslot->paddr += size;
 266                 pslot->size -= size;
 267         }
 268
 269         pavail->pid = current->pid;
 270
 271         pslot = pused_head->next;
 272         plast = pused_head;
 273
 274         /* insert new piece into used piece list !!! */
 275         while (pslot != NULL && pavail->paddr < pslot->paddr) {
 276                 plast = pslot;
 277                 pslot = pslot->next;
 278         }
 279
 280         pavail->next = pslot;
 281         plast->next = pavail;
 282
 283         return pavail->paddr;
 284 }
 285
 286 /* Allocate the largest available block.  */
 287 static void *_sram_alloc_max(struct sram_piece *pfree_head,
 288                                 struct sram_piece *pused_head,
 289                                 unsigned long *psize)
 290 {
 291         struct sram_piece *pslot, *pmax;
 292
 293         if (!pfree_head || !pused_head)
 294                 return NULL;
 295
 296         pmax = pslot = pfree_head->next;
 297
 298         /* search an available piece slot */
 299         while (pslot != NULL) {
 300                 if (pslot->size > pmax->size)
 301                         pmax = pslot;
 302                 pslot = pslot->next;
 303         }
 304
 305         if (!pmax)
 306                 return NULL;
 307
 308         *psize = pmax->size;
 309
 310         return _sram_alloc(*psize, pfree_head, pused_head);
 311 }
 312
 313 /* SRAM free function */
 314 static int _sram_free(const void *addr,
 315                         struct sram_piece *pfree_head,
 316                         struct sram_piece *pused_head)
 317 {
 318         struct sram_piece *pslot, *plast, *pavail;
 319
 320         if (!pfree_head || !pused_head)
 321                 return -1;
 322
 323         /* search the relevant memory slot */
 324         pslot = pused_head->next;
 325         plast = pused_head;
 326
 327         /* search an available piece slot */
 328         while (pslot != NULL && pslot->paddr != addr) {
 329                 plast = pslot;
 330                 pslot = pslot->next;
 331         }
 332
 333         if (!pslot)
 334                 return -1;
 335
 336         plast->next = pslot->next;
 337         pavail = pslot;
 338         pavail->pid = 0;
 339
 340         /* insert free pieces back to the free list */
 341         pslot = pfree_head->next;
 342         plast = pfree_head;
 343
 344         while (pslot != NULL && addr > pslot->paddr) {
 345                 plast = pslot;
 346                 pslot = pslot->next;
 347         }
 348
 349         if (plast != pfree_head && plast->paddr + plast->size == pavail->paddr) {
 350                 plast->size += pavail->size;
 351                 kmem_cache_free(sram_piece_cache, pavail);
 352         } else {
 353                 pavail->next = plast->next;
 354                 plast->next = pavail;
 355                 plast = pavail;
 356         }
 357
 358         if (pslot && plast->paddr + plast->size == pslot->paddr) {
 359                 plast->size += pslot->size;
 360                 plast->next = pslot->next;
 361                 kmem_cache_free(sram_piece_cache, pslot);
 362         }
 363
 364         return 0;
 365 }
 366
 367 int sram_free(const void *addr)
 368 {
 369
 370 #if L1_CODE_LENGTH != 0
 371         if (addr >= (void *)get_l1_code_start()
 372                  && addr < (void *)(get_l1_code_start() + L1_CODE_LENGTH))
 373                 return l1_inst_sram_free(addr);
 374         else
 375 #endif
 376 #if L1_DATA_A_LENGTH != 0
 377         if (addr >= (void *)get_l1_data_a_start()
 378                  && addr < (void *)(get_l1_data_a_start() + L1_DATA_A_LENGTH))
 379                 return l1_data_A_sram_free(addr);
 380         else
 381 #endif
 382 #if L1_DATA_B_LENGTH != 0
 383         if (addr >= (void *)get_l1_data_b_start()
 384                  && addr < (void *)(get_l1_data_b_start() + L1_DATA_B_LENGTH))
 385                 return l1_data_B_sram_free(addr);
 386         else
 387 #endif
 388 #if L2_LENGTH != 0
 389         if (addr >= (void *)L2_START
 390                  && addr < (void *)(L2_START + L2_LENGTH))
 391                 return l2_sram_free(addr);
 392         else
 393 #endif
 394                 return -1;
 395 }
 396 EXPORT_SYMBOL(sram_free);
 397
 398 void *l1_data_A_sram_alloc(size_t size)
 399 {
 400 #if L1_DATA_A_LENGTH != 0
 401         unsigned long flags;
 402         void *addr;
 403         unsigned int cpu;
 404
 405         cpu = get_cpu();
 406         /* add mutex operation */
 407         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 408
 409         addr = _sram_alloc(size, &per_cpu(free_l1_data_A_sram_head, cpu),
 410                         &per_cpu(used_l1_data_A_sram_head, cpu));
 411
 412         /* add mutex operation */
 413         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 414         put_cpu();
 415
 416         pr_debug("Allocated address in l1_data_A_sram_alloc is 0x%lx+0x%lx\n",
 417                  (long unsigned int)addr, size);
 418
 419         return addr;
 420 #else
 421         return NULL;
 422 #endif
 423 }
 424 EXPORT_SYMBOL(l1_data_A_sram_alloc);
 425
 426 int l1_data_A_sram_free(const void *addr)
 427 {
 428 #if L1_DATA_A_LENGTH != 0
 429         unsigned long flags;
 430         int ret;
 431         unsigned int cpu;
 432
 433         cpu = get_cpu();
 434         /* add mutex operation */
 435         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 436
 437         ret = _sram_free(addr, &per_cpu(free_l1_data_A_sram_head, cpu),
 438                         &per_cpu(used_l1_data_A_sram_head, cpu));
 439
 440         /* add mutex operation */
 441         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 442         put_cpu();
 443
 444         return ret;
 445 #else
 446         return -1;
 447 #endif
 448 }
 449 EXPORT_SYMBOL(l1_data_A_sram_free);
 450
 451 void *l1_data_B_sram_alloc(size_t size)
 452 {
 453 #if L1_DATA_B_LENGTH != 0
 454         unsigned long flags;
 455         void *addr;
 456         unsigned int cpu;
 457
 458         cpu = get_cpu();
 459         /* add mutex operation */
 460         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 461
 462         addr = _sram_alloc(size, &per_cpu(free_l1_data_B_sram_head, cpu),
 463                         &per_cpu(used_l1_data_B_sram_head, cpu));
 464
 465         /* add mutex operation */
 466         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 467         put_cpu();
 468
 469         pr_debug("Allocated address in l1_data_B_sram_alloc is 0x%lx+0x%lx\n",
 470                  (long unsigned int)addr, size);
 471
 472         return addr;
 473 #else
 474         return NULL;
 475 #endif
 476 }
 477 EXPORT_SYMBOL(l1_data_B_sram_alloc);
 478
 479 int l1_data_B_sram_free(const void *addr)
 480 {
 481 #if L1_DATA_B_LENGTH != 0
 482         unsigned long flags;
 483         int ret;
 484         unsigned int cpu;
 485
 486         cpu = get_cpu();
 487         /* add mutex operation */
 488         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 489
 490         ret = _sram_free(addr, &per_cpu(free_l1_data_B_sram_head, cpu),
 491                         &per_cpu(used_l1_data_B_sram_head, cpu));
 492
 493         /* add mutex operation */
 494         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 495         put_cpu();
 496
 497         return ret;
 498 #else
 499         return -1;
 500 #endif
 501 }
 502 EXPORT_SYMBOL(l1_data_B_sram_free);
 503
 504 void *l1_data_sram_alloc(size_t size)
 505 {
 506         void *addr = l1_data_A_sram_alloc(size);
 507
 508         if (!addr)
 509                 addr = l1_data_B_sram_alloc(size);
 510
 511         return addr;
 512 }
 513 EXPORT_SYMBOL(l1_data_sram_alloc);
 514
 515 void *l1_data_sram_zalloc(size_t size)
 516 {
 517         void *addr = l1_data_sram_alloc(size);
 518
 519         if (addr)
 520                 memset(addr, 0x00, size);
 521
 522         return addr;
 523 }
 524 EXPORT_SYMBOL(l1_data_sram_zalloc);
 525
 526 int l1_data_sram_free(const void *addr)
 527 {
 528         int ret;
 529         ret = l1_data_A_sram_free(addr);
 530         if (ret == -1)
 531                 ret = l1_data_B_sram_free(addr);
 532         return ret;
 533 }
 534 EXPORT_SYMBOL(l1_data_sram_free);
 535
 536 void *l1_inst_sram_alloc(size_t size)
 537 {
 538 #if L1_CODE_LENGTH != 0
 539         unsigned long flags;
 540         void *addr;
 541         unsigned int cpu;
 542
 543         cpu = get_cpu();
 544         /* add mutex operation */
 545         spin_lock_irqsave(&per_cpu(l1_inst_sram_lock, cpu), flags);
 546
 547         addr = _sram_alloc(size, &per_cpu(free_l1_inst_sram_head, cpu),
 548                         &per_cpu(used_l1_inst_sram_head, cpu));
 549
 550         /* add mutex operation */
 551         spin_unlock_irqrestore(&per_cpu(l1_inst_sram_lock, cpu), flags);
 552         put_cpu();
 553
 554         pr_debug("Allocated address in l1_inst_sram_alloc is 0x%lx+0x%lx\n",
 555                  (long unsigned int)addr, size);
 556
 557         return addr;
 558 #else
 559         return NULL;
 560 #endif
 561 }
 562 EXPORT_SYMBOL(l1_inst_sram_alloc);
 563
 564 int l1_inst_sram_free(const void *addr)
 565 {
 566 #if L1_CODE_LENGTH != 0
 567         unsigned long flags;
 568         int ret;
 569         unsigned int cpu;
 570
 571         cpu = get_cpu();
 572         /* add mutex operation */
 573         spin_lock_irqsave(&per_cpu(l1_inst_sram_lock, cpu), flags);
 574
 575         ret = _sram_free(addr, &per_cpu(free_l1_inst_sram_head, cpu),
 576                         &per_cpu(used_l1_inst_sram_head, cpu));
 577
 578         /* add mutex operation */
 579         spin_unlock_irqrestore(&per_cpu(l1_inst_sram_lock, cpu), flags);
 580         put_cpu();
 581
 582         return ret;
 583 #else
 584         return -1;
 585 #endif
 586 }
 587 EXPORT_SYMBOL(l1_inst_sram_free);
 588
 589 /* L1 Scratchpad memory allocate function */
 590 void *l1sram_alloc(size_t size)
 591 {
 592         unsigned long flags;
 593         void *addr;
 594         unsigned int cpu;
 595
 596         cpu = get_cpu();
 597         /* add mutex operation */
 598         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 599
 600         addr = _sram_alloc(size, &per_cpu(free_l1_ssram_head, cpu),
 601                         &per_cpu(used_l1_ssram_head, cpu));
 602
 603         /* add mutex operation */
 604         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 605         put_cpu();
 606
 607         return addr;
 608 }
 609
 610 /* L1 Scratchpad memory allocate function */
 611 void *l1sram_alloc_max(size_t *psize)
 612 {
 613         unsigned long flags;
 614         void *addr;
 615         unsigned int cpu;
 616
 617         cpu = get_cpu();
 618         /* add mutex operation */
 619         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 620
 621         addr = _sram_alloc_max(&per_cpu(free_l1_ssram_head, cpu),
 622                         &per_cpu(used_l1_ssram_head, cpu), psize);
 623
 624         /* add mutex operation */
 625         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 626         put_cpu();
 627
 628         return addr;
 629 }
 630
 631 /* L1 Scratchpad memory free function */
 632 int l1sram_free(const void *addr)
 633 {
 634         unsigned long flags;
 635         int ret;
 636         unsigned int cpu;
 637
 638         cpu = get_cpu();
 639         /* add mutex operation */
 640         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 641
 642         ret = _sram_free(addr, &per_cpu(free_l1_ssram_head, cpu),
 643                         &per_cpu(used_l1_ssram_head, cpu));
 644
 645         /* add mutex operation */
 646         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 647         put_cpu();
 648
 649         return ret;
 650 }
 651
 652 void *l2_sram_alloc(size_t size)
 653 {
 654 #if L2_LENGTH != 0
 655         unsigned long flags;
 656         void *addr;
 657
 658         /* add mutex operation */
 659         spin_lock_irqsave(&l2_sram_lock, flags);
 660
 661         addr = _sram_alloc(size, &free_l2_sram_head,
 662                         &used_l2_sram_head);
 663
 664         /* add mutex operation */
 665         spin_unlock_irqrestore(&l2_sram_lock, flags);
 666
 667         pr_debug("Allocated address in l2_sram_alloc is 0x%lx+0x%lx\n",
 668                  (long unsigned int)addr, size);
 669
 670         return addr;
 671 #else
 672         return NULL;
 673 #endif
 674 }
 675 EXPORT_SYMBOL(l2_sram_alloc);
 676
 677 void *l2_sram_zalloc(size_t size)
 678 {
 679         void *addr = l2_sram_alloc(size);
 680
 681         if (addr)
 682                 memset(addr, 0x00, size);
 683
 684         return addr;
 685 }
 686 EXPORT_SYMBOL(l2_sram_zalloc);
 687
 688 int l2_sram_free(const void *addr)
 689 {
 690 #if L2_LENGTH != 0
 691         unsigned long flags;
 692         int ret;
 693
 694         /* add mutex operation */
 695         spin_lock_irqsave(&l2_sram_lock, flags);
 696
 697         ret = _sram_free(addr, &free_l2_sram_head,
 698                         &used_l2_sram_head);
 699
 700         /* add mutex operation */
 701         spin_unlock_irqrestore(&l2_sram_lock, flags);
 702
 703         return ret;
 704 #else
 705         return -1;
 706 #endif
 707 }
 708 EXPORT_SYMBOL(l2_sram_free);
 709
 710 int sram_free_with_lsl(const void *addr)
 711 {
 712         struct sram_list_struct *lsl, **tmp;
 713         struct mm_struct *mm = current->mm;
 714
 715         for (tmp = &mm->context.sram_list; *tmp; tmp = &(*tmp)->next)
 716                 if ((*tmp)->addr == addr)
 717                         goto found;
 718         return -1;
 719 found:
 720         lsl = *tmp;
 721         sram_free(addr);
 722         *tmp = lsl->next;
 723         kfree(lsl);
 724
 725         return 0;
 726 }
 727 EXPORT_SYMBOL(sram_free_with_lsl);
 728
 729 /* Allocate memory and keep in L1 SRAM List (lsl) so that the resources are
 730  * tracked.  These are designed for userspace so that when a process exits,
 731  * we can safely reap their resources.
 732  */
 733 void *sram_alloc_with_lsl(size_t size, unsigned long flags)
 734 {
 735         void *addr = NULL;
 736         struct sram_list_struct *lsl = NULL;
 737         struct mm_struct *mm = current->mm;
 738
 739         lsl = kzalloc(sizeof(struct sram_list_struct), GFP_KERNEL);
 740         if (!lsl)
 741                 return NULL;
 742
 743         if (flags & L1_INST_SRAM)
 744                 addr = l1_inst_sram_alloc(size);
 745
 746         if (addr == NULL && (flags & L1_DATA_A_SRAM))
 747                 addr = l1_data_A_sram_alloc(size);
 748
 749         if (addr == NULL && (flags & L1_DATA_B_SRAM))
 750                 addr = l1_data_B_sram_alloc(size);
 751
 752         if (addr == NULL && (flags & L2_SRAM))
 753                 addr = l2_sram_alloc(size);
 754
 755         if (addr == NULL) {
 756                 kfree(lsl);
 757                 return NULL;
 758         }
 759         lsl->addr = addr;
 760         lsl->length = size;
 761         lsl->next = mm->context.sram_list;
 762         mm->context.sram_list = lsl;
 763         return addr;
 764 }
 765 EXPORT_SYMBOL(sram_alloc_with_lsl);
 766
 767 #ifdef CONFIG_PROC_FS
 768 /* Once we get a real allocator, we'll throw all of this away.
 769  * Until then, we need some sort of visibility into the L1 alloc.
 770  */
 771 /* Need to keep line of output the same.  Currently, that is 44 bytes
 772  * (including newline).
 773  */
 774 static int _sram_proc_read(char *buf, int *len, int count, const char *desc,
 775                 struct sram_piece *pfree_head,
 776                 struct sram_piece *pused_head)
 777 {
 778         struct sram_piece *pslot;
 779
 780         if (!pfree_head || !pused_head)
 781                 return -1;
 782
 783         *len += sprintf(&buf[*len], "--- SRAM %-14s Size   PID State     \n", desc);
 784
 785         /* search the relevant memory slot */
 786         pslot = pused_head->next;
 787
 788         while (pslot != NULL) {
 789                 *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 790                         pslot->paddr, pslot->paddr + pslot->size,
 791                         pslot->size, pslot->pid, "ALLOCATED");
 792
 793                 pslot = pslot->next;
 794         }
 795
 796         pslot = pfree_head->next;
 797
 798         while (pslot != NULL) {
 799                 *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 800                         pslot->paddr, pslot->paddr + pslot->size,
 801                         pslot->size, pslot->pid, "FREE");
 802
 803                 pslot = pslot->next;
 804         }
 805
 806         return 0;
 807 }
 808 static int sram_proc_read(char *buf, char **start, off_t offset, int count,
 809                 int *eof, void *data)
 810 {
 811         int len = 0;
 812         unsigned int cpu;
 813
 814         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 815                 if (_sram_proc_read(buf, &len, count, "Scratchpad",
 816                         &per_cpu(free_l1_ssram_head, cpu), &per_cpu(used_l1_ssram_head, cpu)))
 817                         goto not_done;
 818 #if L1_DATA_A_LENGTH != 0
 819                 if (_sram_proc_read(buf, &len, count, "L1 Data A",
 820                         &per_cpu(free_l1_data_A_sram_head, cpu),
 821                         &per_cpu(used_l1_data_A_sram_head, cpu)))
 822                         goto not_done;
 823 #endif
 824 #if L1_DATA_B_LENGTH != 0
 825                 if (_sram_proc_read(buf, &len, count, "L1 Data B",
 826                         &per_cpu(free_l1_data_B_sram_head, cpu),
 827                         &per_cpu(used_l1_data_B_sram_head, cpu)))
 828                         goto not_done;
 829 #endif
 830 #if L1_CODE_LENGTH != 0
 831                 if (_sram_proc_read(buf, &len, count, "L1 Instruction",
 832                         &per_cpu(free_l1_inst_sram_head, cpu),
 833                         &per_cpu(used_l1_inst_sram_head, cpu)))
 834                         goto not_done;
 835 #endif
 836         }
 837 #if L2_LENGTH != 0
 838         if (_sram_proc_read(buf, &len, count, "L2", &free_l2_sram_head,
 839                 &used_l2_sram_head))
 840                 goto not_done;
 841 #endif
 842         *eof = 1;
 843  not_done:
 844         return len;
 845 }
 846
 847 static int __init sram_proc_init(void)
 848 {
 849         struct proc_dir_entry *ptr;
 850         ptr = create_proc_entry("sram", S_IFREG | S_IRUGO, NULL);
 851         if (!ptr) {
 852                 printk(KERN_WARNING "unable to create /proc/sram\n");
 853                 return -1;
 854         }
 855         ptr->read_proc = sram_proc_read;
 856         return 0;
 857 }
 858 late_initcall(sram_proc_init);
 859 #endif