arch/parisc/kernel/pci-dma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3 ** PARISC 1.1 Dynamic DMA mapping support.
   4 ** This implementation is for PA-RISC platforms that do not support
   5 ** I/O TLBs (aka DMA address translation hardware).
   6 ** See Documentation/DMA-API-HOWTO.txt for interface definitions.
   7 **
   8 **      (c) Copyright 1999,2000 Hewlett-Packard Company
   9 **      (c) Copyright 2000 Grant Grundler
  10 **      (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
  11 **      (c) Copyright 2000 John Marvin
  12 **
  13 ** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
  14 ** (I assume it's from David Mosberger-Tang but there was no Copyright)
  15 **
  16 ** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
  17 **
  18 ** - ggg
  19 */
  20
  21 #include <linux/init.h>
  22 #include <linux/gfp.h>
  23 #include <linux/mm.h>
  24 #include <linux/pci.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/string.h>
  28 #include <linux/types.h>
  29 #include <linux/scatterlist.h>
  30 #include <linux/export.h>
  31
  32 #include <asm/cacheflush.h>
  33 #include <asm/dma.h>    /* for DMA_CHUNK_SIZE */
  34 #include <asm/io.h>
  35 #include <asm/page.h>   /* get_order */
  36 #include <asm/pgalloc.h>
  37 #include <linux/uaccess.h>
  38 #include <asm/tlbflush.h>       /* for purge_tlb_*() macros */
  39
  40 static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
  41 static unsigned long pcxl_used_bytes __read_mostly = 0;
  42 static unsigned long pcxl_used_pages __read_mostly = 0;
  43
  44 extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
  45 static DEFINE_SPINLOCK(pcxl_res_lock);
  46 static char    *pcxl_res_map;
  47 static int     pcxl_res_hint;
  48 static int     pcxl_res_size;
  49
  50 #ifdef DEBUG_PCXL_RESOURCE
  51 #define DBG_RES(x...)   printk(x)
  52 #else
  53 #define DBG_RES(x...)
  54 #endif
  55
  56
  57 /*
  58 ** Dump a hex representation of the resource map.
  59 */
  60
  61 #ifdef DUMP_RESMAP
  62 static
  63 void dump_resmap(void)
  64 {
  65         u_long *res_ptr = (unsigned long *)pcxl_res_map;
  66         u_long i = 0;
  67
  68         printk("res_map: ");
  69         for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
  70                 printk("%08lx ", *res_ptr);
  71
  72         printk("\n");
  73 }
  74 #else
  75 static inline void dump_resmap(void) {;}
  76 #endif
  77
  78 static inline int map_pte_uncached(pte_t * pte,
  79                 unsigned long vaddr,
  80                 unsigned long size, unsigned long *paddr_ptr)
  81 {
  82         unsigned long end;
  83         unsigned long orig_vaddr = vaddr;
  84
  85         vaddr &= ~PMD_MASK;
  86         end = vaddr + size;
  87         if (end > PMD_SIZE)
  88                 end = PMD_SIZE;
  89         do {
  90                 unsigned long flags;
  91
  92                 if (!pte_none(*pte))
  93                         printk(KERN_ERR "map_pte_uncached: page already exists\n");
  94                 purge_tlb_start(flags);
  95                 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
  96                 pdtlb_kernel(orig_vaddr);
  97                 purge_tlb_end(flags);
  98                 vaddr += PAGE_SIZE;
  99                 orig_vaddr += PAGE_SIZE;
 100                 (*paddr_ptr) += PAGE_SIZE;
 101                 pte++;
 102         } while (vaddr < end);
 103         return 0;
 104 }
 105
 106 static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
 107                 unsigned long size, unsigned long *paddr_ptr)
 108 {
 109         unsigned long end;
 110         unsigned long orig_vaddr = vaddr;
 111
 112         vaddr &= ~PGDIR_MASK;
 113         end = vaddr + size;
 114         if (end > PGDIR_SIZE)
 115                 end = PGDIR_SIZE;
 116         do {
 117                 pte_t * pte = pte_alloc_kernel(pmd, vaddr);
 118                 if (!pte)
 119                         return -ENOMEM;
 120                 if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
 121                         return -ENOMEM;
 122                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
 123                 orig_vaddr += PMD_SIZE;
 124                 pmd++;
 125         } while (vaddr < end);
 126         return 0;
 127 }
 128
 129 static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
 130                 unsigned long paddr)
 131 {
 132         pgd_t * dir;
 133         unsigned long end = vaddr + size;
 134
 135         dir = pgd_offset_k(vaddr);
 136         do {
 137                 pmd_t *pmd;
 138
 139                 pmd = pmd_alloc(NULL, dir, vaddr);
 140                 if (!pmd)
 141                         return -ENOMEM;
 142                 if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
 143                         return -ENOMEM;
 144                 vaddr = vaddr + PGDIR_SIZE;
 145                 dir++;
 146         } while (vaddr && (vaddr < end));
 147         return 0;
 148 }
 149
 150 static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
 151                 unsigned long size)
 152 {
 153         pte_t * pte;
 154         unsigned long end;
 155         unsigned long orig_vaddr = vaddr;
 156
 157         if (pmd_none(*pmd))
 158                 return;
 159         if (pmd_bad(*pmd)) {
 160                 pmd_ERROR(*pmd);
 161                 pmd_clear(pmd);
 162                 return;
 163         }
 164         pte = pte_offset_map(pmd, vaddr);
 165         vaddr &= ~PMD_MASK;
 166         end = vaddr + size;
 167         if (end > PMD_SIZE)
 168                 end = PMD_SIZE;
 169         do {
 170                 unsigned long flags;
 171                 pte_t page = *pte;
 172
 173                 pte_clear(&init_mm, vaddr, pte);
 174                 purge_tlb_start(flags);
 175                 pdtlb_kernel(orig_vaddr);
 176                 purge_tlb_end(flags);
 177                 vaddr += PAGE_SIZE;
 178                 orig_vaddr += PAGE_SIZE;
 179                 pte++;
 180                 if (pte_none(page) || pte_present(page))
 181                         continue;
 182                 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
 183         } while (vaddr < end);
 184 }
 185
 186 static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
 187                 unsigned long size)
 188 {
 189         pmd_t * pmd;
 190         unsigned long end;
 191         unsigned long orig_vaddr = vaddr;
 192
 193         if (pgd_none(*dir))
 194                 return;
 195         if (pgd_bad(*dir)) {
 196                 pgd_ERROR(*dir);
 197                 pgd_clear(dir);
 198                 return;
 199         }
 200         pmd = pmd_offset(dir, vaddr);
 201         vaddr &= ~PGDIR_MASK;
 202         end = vaddr + size;
 203         if (end > PGDIR_SIZE)
 204                 end = PGDIR_SIZE;
 205         do {
 206                 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
 207                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
 208                 orig_vaddr += PMD_SIZE;
 209                 pmd++;
 210         } while (vaddr < end);
 211 }
 212
 213 static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
 214 {
 215         pgd_t * dir;
 216         unsigned long end = vaddr + size;
 217
 218         dir = pgd_offset_k(vaddr);
 219         do {
 220                 unmap_uncached_pmd(dir, vaddr, end - vaddr);
 221                 vaddr = vaddr + PGDIR_SIZE;
 222                 dir++;
 223         } while (vaddr && (vaddr < end));
 224 }
 225
 226 #define PCXL_SEARCH_LOOP(idx, mask, size)  \
 227        for(; res_ptr < res_end; ++res_ptr) \
 228        { \
 229                if(0 == ((*res_ptr) & mask)) { \
 230                        *res_ptr |= mask; \
 231                        idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
 232                        pcxl_res_hint = idx + (size >> 3); \
 233                        goto resource_found; \
 234                } \
 235        }
 236
 237 #define PCXL_FIND_FREE_MAPPING(idx, mask, size)  { \
 238        u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
 239        u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
 240        PCXL_SEARCH_LOOP(idx, mask, size); \
 241        res_ptr = (u##size *)&pcxl_res_map[0]; \
 242        PCXL_SEARCH_LOOP(idx, mask, size); \
 243 }
 244
 245 unsigned long
 246 pcxl_alloc_range(size_t size)
 247 {
 248         int res_idx;
 249         u_long mask, flags;
 250         unsigned int pages_needed = size >> PAGE_SHIFT;
 251
 252         mask = (u_long) -1L;
 253         mask >>= BITS_PER_LONG - pages_needed;
 254
 255         DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
 256                 size, pages_needed, mask);
 257
 258         spin_lock_irqsave(&pcxl_res_lock, flags);
 259
 260         if(pages_needed <= 8) {
 261                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
 262         } else if(pages_needed <= 16) {
 263                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
 264         } else if(pages_needed <= 32) {
 265                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
 266         } else {
 267                 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
 268                       __FILE__);
 269         }
 270
 271         dump_resmap();
 272         panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
 273               __FILE__);
 274
 275 resource_found:
 276
 277         DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
 278                 res_idx, mask, pcxl_res_hint);
 279
 280         pcxl_used_pages += pages_needed;
 281         pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
 282
 283         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 284
 285         dump_resmap();
 286
 287         /*
 288         ** return the corresponding vaddr in the pcxl dma map
 289         */
 290         return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
 291 }
 292
 293 #define PCXL_FREE_MAPPINGS(idx, m, size) \
 294                 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
 295                 /* BUG_ON((*res_ptr & m) != m); */ \
 296                 *res_ptr &= ~m;
 297
 298 /*
 299 ** clear bits in the pcxl resource map
 300 */
 301 static void
 302 pcxl_free_range(unsigned long vaddr, size_t size)
 303 {
 304         u_long mask, flags;
 305         unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
 306         unsigned int pages_mapped = size >> PAGE_SHIFT;
 307
 308         mask = (u_long) -1L;
 309         mask >>= BITS_PER_LONG - pages_mapped;
 310
 311         DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
 312                 res_idx, size, pages_mapped, mask);
 313
 314         spin_lock_irqsave(&pcxl_res_lock, flags);
 315
 316         if(pages_mapped <= 8) {
 317                 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
 318         } else if(pages_mapped <= 16) {
 319                 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
 320         } else if(pages_mapped <= 32) {
 321                 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
 322         } else {
 323                 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
 324                       __FILE__);
 325         }
 326
 327         pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
 328         pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
 329
 330         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 331
 332         dump_resmap();
 333 }
 334
 335 static int proc_pcxl_dma_show(struct seq_file *m, void *v)
 336 {
 337 #if 0
 338         u_long i = 0;
 339         unsigned long *res_ptr = (u_long *)pcxl_res_map;
 340 #endif
 341         unsigned long total_pages = pcxl_res_size << 3;   /* 8 bits per byte */
 342
 343         seq_printf(m, "\nDMA Mapping Area size    : %d bytes (%ld pages)\n",
 344                 PCXL_DMA_MAP_SIZE, total_pages);
 345
 346         seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
 347
 348         seq_puts(m,  "            total:    free:    used:   % used:\n");
 349         seq_printf(m, "blocks  %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
 350                 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
 351                 (pcxl_used_bytes * 100) / pcxl_res_size);
 352
 353         seq_printf(m, "pages   %8ld %8ld %8ld %8ld%%\n", total_pages,
 354                 total_pages - pcxl_used_pages, pcxl_used_pages,
 355                 (pcxl_used_pages * 100 / total_pages));
 356
 357 #if 0
 358         seq_puts(m, "\nResource bitmap:");
 359
 360         for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
 361                 if ((i & 7) == 0)
 362                     seq_puts(m,"\n   ");
 363                 seq_printf(m, "%s %08lx", buf, *res_ptr);
 364         }
 365 #endif
 366         seq_putc(m, '\n');
 367         return 0;
 368 }
 369
 370 static int proc_pcxl_dma_open(struct inode *inode, struct file *file)
 371 {
 372         return single_open(file, proc_pcxl_dma_show, NULL);
 373 }
 374
 375 static const struct file_operations proc_pcxl_dma_ops = {
 376         .owner          = THIS_MODULE,
 377         .open           = proc_pcxl_dma_open,
 378         .read           = seq_read,
 379         .llseek         = seq_lseek,
 380         .release        = single_release,
 381 };
 382
 383 static int __init
 384 pcxl_dma_init(void)
 385 {
 386         if (pcxl_dma_start == 0)
 387                 return 0;
 388
 389         pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
 390         pcxl_res_hint = 0;
 391         pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
 392                                             get_order(pcxl_res_size));
 393         memset(pcxl_res_map, 0, pcxl_res_size);
 394         proc_gsc_root = proc_mkdir("gsc", NULL);
 395         if (!proc_gsc_root)
 396                 printk(KERN_WARNING
 397                         "pcxl_dma_init: Unable to create gsc /proc dir entry\n");
 398         else {
 399                 struct proc_dir_entry* ent;
 400                 ent = proc_create("pcxl_dma", 0, proc_gsc_root,
 401                                   &proc_pcxl_dma_ops);
 402                 if (!ent)
 403                         printk(KERN_WARNING
 404                                 "pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
 405         }
 406         return 0;
 407 }
 408
 409 __initcall(pcxl_dma_init);
 410
 411 static void *pa11_dma_alloc(struct device *dev, size_t size,
 412                 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
 413 {
 414         unsigned long vaddr;
 415         unsigned long paddr;
 416         int order;
 417
 418         order = get_order(size);
 419         size = 1 << (order + PAGE_SHIFT);
 420         vaddr = pcxl_alloc_range(size);
 421         paddr = __get_free_pages(flag, order);
 422         flush_kernel_dcache_range(paddr, size);
 423         paddr = __pa(paddr);
 424         map_uncached_pages(vaddr, size, paddr);
 425         *dma_handle = (dma_addr_t) paddr;
 426
 427 #if 0
 428 /* This probably isn't needed to support EISA cards.
 429 ** ISA cards will certainly only support 24-bit DMA addressing.
 430 ** Not clear if we can, want, or need to support ISA.
 431 */
 432         if (!dev || *dev->coherent_dma_mask < 0xffffffff)
 433                 gfp |= GFP_DMA;
 434 #endif
 435         return (void *)vaddr;
 436 }
 437
 438 static void pa11_dma_free(struct device *dev, size_t size, void *vaddr,
 439                 dma_addr_t dma_handle, unsigned long attrs)
 440 {
 441         int order;
 442
 443         order = get_order(size);
 444         size = 1 << (order + PAGE_SHIFT);
 445         unmap_uncached_pages((unsigned long)vaddr, size);
 446         pcxl_free_range((unsigned long)vaddr, size);
 447         free_pages((unsigned long)__va(dma_handle), order);
 448 }
 449
 450 static dma_addr_t pa11_dma_map_page(struct device *dev, struct page *page,
 451                 unsigned long offset, size_t size,
 452                 enum dma_data_direction direction, unsigned long attrs)
 453 {
 454         void *addr = page_address(page) + offset;
 455         BUG_ON(direction == DMA_NONE);
 456
 457         if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
 458                 flush_kernel_dcache_range((unsigned long) addr, size);
 459
 460         return virt_to_phys(addr);
 461 }
 462
 463 static void pa11_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
 464                 size_t size, enum dma_data_direction direction,
 465                 unsigned long attrs)
 466 {
 467         BUG_ON(direction == DMA_NONE);
 468
 469         if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
 470                 return;
 471
 472         if (direction == DMA_TO_DEVICE)
 473                 return;
 474
 475         /*
 476          * For PCI_DMA_FROMDEVICE this flush is not necessary for the
 477          * simple map/unmap case. However, it IS necessary if if
 478          * pci_dma_sync_single_* has been called and the buffer reused.
 479          */
 480
 481         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
 482 }
 483
 484 static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist,
 485                 int nents, enum dma_data_direction direction,
 486                 unsigned long attrs)
 487 {
 488         int i;
 489         struct scatterlist *sg;
 490
 491         BUG_ON(direction == DMA_NONE);
 492
 493         for_each_sg(sglist, sg, nents, i) {
 494                 unsigned long vaddr = (unsigned long)sg_virt(sg);
 495
 496                 sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr);
 497                 sg_dma_len(sg) = sg->length;
 498
 499                 if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
 500                         continue;
 501
 502                 flush_kernel_dcache_range(vaddr, sg->length);
 503         }
 504         return nents;
 505 }
 506
 507 static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
 508                 int nents, enum dma_data_direction direction,
 509                 unsigned long attrs)
 510 {
 511         int i;
 512         struct scatterlist *sg;
 513
 514         BUG_ON(direction == DMA_NONE);
 515
 516         if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
 517                 return;
 518
 519         if (direction == DMA_TO_DEVICE)
 520                 return;
 521
 522         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 523
 524         for_each_sg(sglist, sg, nents, i)
 525                 flush_kernel_vmap_range(sg_virt(sg), sg->length);
 526 }
 527
 528 static void pa11_dma_sync_single_for_cpu(struct device *dev,
 529                 dma_addr_t dma_handle, size_t size,
 530                 enum dma_data_direction direction)
 531 {
 532         BUG_ON(direction == DMA_NONE);
 533
 534         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
 535                         size);
 536 }
 537
 538 static void pa11_dma_sync_single_for_device(struct device *dev,
 539                 dma_addr_t dma_handle, size_t size,
 540                 enum dma_data_direction direction)
 541 {
 542         BUG_ON(direction == DMA_NONE);
 543
 544         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
 545                         size);
 546 }
 547
 548 static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 549 {
 550         int i;
 551         struct scatterlist *sg;
 552
 553         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 554
 555         for_each_sg(sglist, sg, nents, i)
 556                 flush_kernel_vmap_range(sg_virt(sg), sg->length);
 557 }
 558
 559 static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 560 {
 561         int i;
 562         struct scatterlist *sg;
 563
 564         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 565
 566         for_each_sg(sglist, sg, nents, i)
 567                 flush_kernel_vmap_range(sg_virt(sg), sg->length);
 568 }
 569
 570 static void pa11_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 571                enum dma_data_direction direction)
 572 {
 573         flush_kernel_dcache_range((unsigned long)vaddr, size);
 574 }
 575
 576 const struct dma_map_ops pcxl_dma_ops = {
 577         .alloc =                pa11_dma_alloc,
 578         .free =                 pa11_dma_free,
 579         .map_page =             pa11_dma_map_page,
 580         .unmap_page =           pa11_dma_unmap_page,
 581         .map_sg =               pa11_dma_map_sg,
 582         .unmap_sg =             pa11_dma_unmap_sg,
 583         .sync_single_for_cpu =  pa11_dma_sync_single_for_cpu,
 584         .sync_single_for_device = pa11_dma_sync_single_for_device,
 585         .sync_sg_for_cpu =      pa11_dma_sync_sg_for_cpu,
 586         .sync_sg_for_device =   pa11_dma_sync_sg_for_device,
 587         .cache_sync =           pa11_dma_cache_sync,
 588 };
 589
 590 static void *pcx_dma_alloc(struct device *dev, size_t size,
 591                 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
 592 {
 593         void *addr;
 594
 595         if ((attrs & DMA_ATTR_NON_CONSISTENT) == 0)
 596                 return NULL;
 597
 598         addr = (void *)__get_free_pages(flag, get_order(size));
 599         if (addr)
 600                 *dma_handle = (dma_addr_t)virt_to_phys(addr);
 601
 602         return addr;
 603 }
 604
 605 static void pcx_dma_free(struct device *dev, size_t size, void *vaddr,
 606                 dma_addr_t iova, unsigned long attrs)
 607 {
 608         free_pages((unsigned long)vaddr, get_order(size));
 609         return;
 610 }
 611
 612 const struct dma_map_ops pcx_dma_ops = {
 613         .alloc =                pcx_dma_alloc,
 614         .free =                 pcx_dma_free,
 615         .map_page =             pa11_dma_map_page,
 616         .unmap_page =           pa11_dma_unmap_page,
 617         .map_sg =               pa11_dma_map_sg,
 618         .unmap_sg =             pa11_dma_unmap_sg,
 619         .sync_single_for_cpu =  pa11_dma_sync_single_for_cpu,
 620         .sync_single_for_device = pa11_dma_sync_single_for_device,
 621         .sync_sg_for_cpu =      pa11_dma_sync_sg_for_cpu,
 622         .sync_sg_for_device =   pa11_dma_sync_sg_for_device,
 623         .cache_sync =           pa11_dma_cache_sync,
 624 };