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 = smp_processor_id();
 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
 415         pr_debug("Allocated address in l1_data_A_sram_alloc is 0x%lx+0x%lx\n",
 416                  (long unsigned int)addr, size);
 417
 418         return addr;
 419 #else
 420         return NULL;
 421 #endif
 422 }
 423 EXPORT_SYMBOL(l1_data_A_sram_alloc);
 424
 425 int l1_data_A_sram_free(const void *addr)
 426 {
 427 #if L1_DATA_A_LENGTH != 0
 428         unsigned long flags;
 429         int ret;
 430         unsigned int cpu;
 431
 432         cpu = smp_processor_id();
 433         /* add mutex operation */
 434         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 435
 436         ret = _sram_free(addr, &per_cpu(free_l1_data_A_sram_head, cpu),
 437                         &per_cpu(used_l1_data_A_sram_head, cpu));
 438
 439         /* add mutex operation */
 440         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 441
 442         return ret;
 443 #else
 444         return -1;
 445 #endif
 446 }
 447 EXPORT_SYMBOL(l1_data_A_sram_free);
 448
 449 void *l1_data_B_sram_alloc(size_t size)
 450 {
 451 #if L1_DATA_B_LENGTH != 0
 452         unsigned long flags;
 453         void *addr;
 454         unsigned int cpu;
 455
 456         cpu = smp_processor_id();
 457         /* add mutex operation */
 458         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 459
 460         addr = _sram_alloc(size, &per_cpu(free_l1_data_B_sram_head, cpu),
 461                         &per_cpu(used_l1_data_B_sram_head, cpu));
 462
 463         /* add mutex operation */
 464         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 465
 466         pr_debug("Allocated address in l1_data_B_sram_alloc is 0x%lx+0x%lx\n",
 467                  (long unsigned int)addr, size);
 468
 469         return addr;
 470 #else
 471         return NULL;
 472 #endif
 473 }
 474 EXPORT_SYMBOL(l1_data_B_sram_alloc);
 475
 476 int l1_data_B_sram_free(const void *addr)
 477 {
 478 #if L1_DATA_B_LENGTH != 0
 479         unsigned long flags;
 480         int ret;
 481         unsigned int cpu;
 482
 483         cpu = smp_processor_id();
 484         /* add mutex operation */
 485         spin_lock_irqsave(&per_cpu(l1_data_sram_lock, cpu), flags);
 486
 487         ret = _sram_free(addr, &per_cpu(free_l1_data_B_sram_head, cpu),
 488                         &per_cpu(used_l1_data_B_sram_head, cpu));
 489
 490         /* add mutex operation */
 491         spin_unlock_irqrestore(&per_cpu(l1_data_sram_lock, cpu), flags);
 492
 493         return ret;
 494 #else
 495         return -1;
 496 #endif
 497 }
 498 EXPORT_SYMBOL(l1_data_B_sram_free);
 499
 500 void *l1_data_sram_alloc(size_t size)
 501 {
 502         void *addr = l1_data_A_sram_alloc(size);
 503
 504         if (!addr)
 505                 addr = l1_data_B_sram_alloc(size);
 506
 507         return addr;
 508 }
 509 EXPORT_SYMBOL(l1_data_sram_alloc);
 510
 511 void *l1_data_sram_zalloc(size_t size)
 512 {
 513         void *addr = l1_data_sram_alloc(size);
 514
 515         if (addr)
 516                 memset(addr, 0x00, size);
 517
 518         return addr;
 519 }
 520 EXPORT_SYMBOL(l1_data_sram_zalloc);
 521
 522 int l1_data_sram_free(const void *addr)
 523 {
 524         int ret;
 525         ret = l1_data_A_sram_free(addr);
 526         if (ret == -1)
 527                 ret = l1_data_B_sram_free(addr);
 528         return ret;
 529 }
 530 EXPORT_SYMBOL(l1_data_sram_free);
 531
 532 void *l1_inst_sram_alloc(size_t size)
 533 {
 534 #if L1_CODE_LENGTH != 0
 535         unsigned long flags;
 536         void *addr;
 537         unsigned int cpu;
 538
 539         cpu = smp_processor_id();
 540         /* add mutex operation */
 541         spin_lock_irqsave(&per_cpu(l1_inst_sram_lock, cpu), flags);
 542
 543         addr = _sram_alloc(size, &per_cpu(free_l1_inst_sram_head, cpu),
 544                         &per_cpu(used_l1_inst_sram_head, cpu));
 545
 546         /* add mutex operation */
 547         spin_unlock_irqrestore(&per_cpu(l1_inst_sram_lock, cpu), flags);
 548
 549         pr_debug("Allocated address in l1_inst_sram_alloc is 0x%lx+0x%lx\n",
 550                  (long unsigned int)addr, size);
 551
 552         return addr;
 553 #else
 554         return NULL;
 555 #endif
 556 }
 557 EXPORT_SYMBOL(l1_inst_sram_alloc);
 558
 559 int l1_inst_sram_free(const void *addr)
 560 {
 561 #if L1_CODE_LENGTH != 0
 562         unsigned long flags;
 563         int ret;
 564         unsigned int cpu;
 565
 566         cpu = smp_processor_id();
 567         /* add mutex operation */
 568         spin_lock_irqsave(&per_cpu(l1_inst_sram_lock, cpu), flags);
 569
 570         ret = _sram_free(addr, &per_cpu(free_l1_inst_sram_head, cpu),
 571                         &per_cpu(used_l1_inst_sram_head, cpu));
 572
 573         /* add mutex operation */
 574         spin_unlock_irqrestore(&per_cpu(l1_inst_sram_lock, cpu), flags);
 575
 576         return ret;
 577 #else
 578         return -1;
 579 #endif
 580 }
 581 EXPORT_SYMBOL(l1_inst_sram_free);
 582
 583 /* L1 Scratchpad memory allocate function */
 584 void *l1sram_alloc(size_t size)
 585 {
 586         unsigned long flags;
 587         void *addr;
 588         unsigned int cpu;
 589
 590         cpu = smp_processor_id();
 591         /* add mutex operation */
 592         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 593
 594         addr = _sram_alloc(size, &per_cpu(free_l1_ssram_head, cpu),
 595                         &per_cpu(used_l1_ssram_head, cpu));
 596
 597         /* add mutex operation */
 598         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 599
 600         return addr;
 601 }
 602
 603 /* L1 Scratchpad memory allocate function */
 604 void *l1sram_alloc_max(size_t *psize)
 605 {
 606         unsigned long flags;
 607         void *addr;
 608         unsigned int cpu;
 609
 610         cpu = smp_processor_id();
 611         /* add mutex operation */
 612         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 613
 614         addr = _sram_alloc_max(&per_cpu(free_l1_ssram_head, cpu),
 615                         &per_cpu(used_l1_ssram_head, cpu), psize);
 616
 617         /* add mutex operation */
 618         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 619
 620         return addr;
 621 }
 622
 623 /* L1 Scratchpad memory free function */
 624 int l1sram_free(const void *addr)
 625 {
 626         unsigned long flags;
 627         int ret;
 628         unsigned int cpu;
 629
 630         cpu = smp_processor_id();
 631         /* add mutex operation */
 632         spin_lock_irqsave(&per_cpu(l1sram_lock, cpu), flags);
 633
 634         ret = _sram_free(addr, &per_cpu(free_l1_ssram_head, cpu),
 635                         &per_cpu(used_l1_ssram_head, cpu));
 636
 637         /* add mutex operation */
 638         spin_unlock_irqrestore(&per_cpu(l1sram_lock, cpu), flags);
 639
 640         return ret;
 641 }
 642
 643 void *l2_sram_alloc(size_t size)
 644 {
 645 #if L2_LENGTH != 0
 646         unsigned long flags;
 647         void *addr;
 648
 649         /* add mutex operation */
 650         spin_lock_irqsave(&l2_sram_lock, flags);
 651
 652         addr = _sram_alloc(size, &free_l2_sram_head,
 653                         &used_l2_sram_head);
 654
 655         /* add mutex operation */
 656         spin_unlock_irqrestore(&l2_sram_lock, flags);
 657
 658         pr_debug("Allocated address in l2_sram_alloc is 0x%lx+0x%lx\n",
 659                  (long unsigned int)addr, size);
 660
 661         return addr;
 662 #else
 663         return NULL;
 664 #endif
 665 }
 666 EXPORT_SYMBOL(l2_sram_alloc);
 667
 668 void *l2_sram_zalloc(size_t size)
 669 {
 670         void *addr = l2_sram_alloc(size);
 671
 672         if (addr)
 673                 memset(addr, 0x00, size);
 674
 675         return addr;
 676 }
 677 EXPORT_SYMBOL(l2_sram_zalloc);
 678
 679 int l2_sram_free(const void *addr)
 680 {
 681 #if L2_LENGTH != 0
 682         unsigned long flags;
 683         int ret;
 684
 685         /* add mutex operation */
 686         spin_lock_irqsave(&l2_sram_lock, flags);
 687
 688         ret = _sram_free(addr, &free_l2_sram_head,
 689                         &used_l2_sram_head);
 690
 691         /* add mutex operation */
 692         spin_unlock_irqrestore(&l2_sram_lock, flags);
 693
 694         return ret;
 695 #else
 696         return -1;
 697 #endif
 698 }
 699 EXPORT_SYMBOL(l2_sram_free);
 700
 701 int sram_free_with_lsl(const void *addr)
 702 {
 703         struct sram_list_struct *lsl, **tmp;
 704         struct mm_struct *mm = current->mm;
 705
 706         for (tmp = &mm->context.sram_list; *tmp; tmp = &(*tmp)->next)
 707                 if ((*tmp)->addr == addr)
 708                         goto found;
 709         return -1;
 710 found:
 711         lsl = *tmp;
 712         sram_free(addr);
 713         *tmp = lsl->next;
 714         kfree(lsl);
 715
 716         return 0;
 717 }
 718 EXPORT_SYMBOL(sram_free_with_lsl);
 719
 720 /* Allocate memory and keep in L1 SRAM List (lsl) so that the resources are
 721  * tracked.  These are designed for userspace so that when a process exits,
 722  * we can safely reap their resources.
 723  */
 724 void *sram_alloc_with_lsl(size_t size, unsigned long flags)
 725 {
 726         void *addr = NULL;
 727         struct sram_list_struct *lsl = NULL;
 728         struct mm_struct *mm = current->mm;
 729
 730         lsl = kzalloc(sizeof(struct sram_list_struct), GFP_KERNEL);
 731         if (!lsl)
 732                 return NULL;
 733
 734         if (flags & L1_INST_SRAM)
 735                 addr = l1_inst_sram_alloc(size);
 736
 737         if (addr == NULL && (flags & L1_DATA_A_SRAM))
 738                 addr = l1_data_A_sram_alloc(size);
 739
 740         if (addr == NULL && (flags & L1_DATA_B_SRAM))
 741                 addr = l1_data_B_sram_alloc(size);
 742
 743         if (addr == NULL && (flags & L2_SRAM))
 744                 addr = l2_sram_alloc(size);
 745
 746         if (addr == NULL) {
 747                 kfree(lsl);
 748                 return NULL;
 749         }
 750         lsl->addr = addr;
 751         lsl->length = size;
 752         lsl->next = mm->context.sram_list;
 753         mm->context.sram_list = lsl;
 754         return addr;
 755 }
 756 EXPORT_SYMBOL(sram_alloc_with_lsl);
 757
 758 #ifdef CONFIG_PROC_FS
 759 /* Once we get a real allocator, we'll throw all of this away.
 760  * Until then, we need some sort of visibility into the L1 alloc.
 761  */
 762 /* Need to keep line of output the same.  Currently, that is 44 bytes
 763  * (including newline).
 764  */
 765 static int _sram_proc_read(char *buf, int *len, int count, const char *desc,
 766                 struct sram_piece *pfree_head,
 767                 struct sram_piece *pused_head)
 768 {
 769         struct sram_piece *pslot;
 770
 771         if (!pfree_head || !pused_head)
 772                 return -1;
 773
 774         *len += sprintf(&buf[*len], "--- SRAM %-14s Size   PID State     \n", desc);
 775
 776         /* search the relevant memory slot */
 777         pslot = pused_head->next;
 778
 779         while (pslot != NULL) {
 780                 *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 781                         pslot->paddr, pslot->paddr + pslot->size,
 782                         pslot->size, pslot->pid, "ALLOCATED");
 783
 784                 pslot = pslot->next;
 785         }
 786
 787         pslot = pfree_head->next;
 788
 789         while (pslot != NULL) {
 790                 *len += sprintf(&buf[*len], "%p-%p %10i %5i %-10s\n",
 791                         pslot->paddr, pslot->paddr + pslot->size,
 792                         pslot->size, pslot->pid, "FREE");
 793
 794                 pslot = pslot->next;
 795         }
 796
 797         return 0;
 798 }
 799 static int sram_proc_read(char *buf, char **start, off_t offset, int count,
 800                 int *eof, void *data)
 801 {
 802         int len = 0;
 803         unsigned int cpu;
 804
 805         for (cpu = 0; cpu < num_possible_cpus(); ++cpu) {
 806                 if (_sram_proc_read(buf, &len, count, "Scratchpad",
 807                         &per_cpu(free_l1_ssram_head, cpu), &per_cpu(used_l1_ssram_head, cpu)))
 808                         goto not_done;
 809 #if L1_DATA_A_LENGTH != 0
 810                 if (_sram_proc_read(buf, &len, count, "L1 Data A",
 811                         &per_cpu(free_l1_data_A_sram_head, cpu),
 812                         &per_cpu(used_l1_data_A_sram_head, cpu)))
 813                         goto not_done;
 814 #endif
 815 #if L1_DATA_B_LENGTH != 0
 816                 if (_sram_proc_read(buf, &len, count, "L1 Data B",
 817                         &per_cpu(free_l1_data_B_sram_head, cpu),
 818                         &per_cpu(used_l1_data_B_sram_head, cpu)))
 819                         goto not_done;
 820 #endif
 821 #if L1_CODE_LENGTH != 0
 822                 if (_sram_proc_read(buf, &len, count, "L1 Instruction",
 823                         &per_cpu(free_l1_inst_sram_head, cpu),
 824                         &per_cpu(used_l1_inst_sram_head, cpu)))
 825                         goto not_done;
 826 #endif
 827         }
 828 #if L2_LENGTH != 0
 829         if (_sram_proc_read(buf, &len, count, "L2", &free_l2_sram_head,
 830                 &used_l2_sram_head))
 831                 goto not_done;
 832 #endif
 833         *eof = 1;
 834  not_done:
 835         return len;
 836 }
 837
 838 static int __init sram_proc_init(void)
 839 {
 840         struct proc_dir_entry *ptr;
 841         ptr = create_proc_entry("sram", S_IFREG | S_IRUGO, NULL);
 842         if (!ptr) {
 843                 printk(KERN_WARNING "unable to create /proc/sram\n");
 844                 return -1;
 845         }
 846         ptr->read_proc = sram_proc_read;
 847         return 0;
 848 }
 849 late_initcall(sram_proc_init);
 850 #endif