arch/parisc/kernel/pci-dma.c

   1 /*
   2 ** PARISC 1.1 Dynamic DMA mapping support.
   3 ** This implementation is for PA-RISC platforms that do not support
   4 ** I/O TLBs (aka DMA address translation hardware).
   5 ** See Documentation/PCI/PCI-DMA-mapping.txt for interface definitions.
   6 **
   7 **      (c) Copyright 1999,2000 Hewlett-Packard Company
   8 **      (c) Copyright 2000 Grant Grundler
   9 **      (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
  10 **      (c) Copyright 2000 John Marvin
  11 **
  12 ** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
  13 ** (I assume it's from David Mosberger-Tang but there was no Copyright)
  14 **
  15 ** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
  16 **
  17 ** - ggg
  18 */
  19
  20 #include <linux/init.h>
  21 #include <linux/mm.h>
  22 #include <linux/pci.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/slab.h>
  26 #include <linux/string.h>
  27 #include <linux/types.h>
  28 #include <linux/scatterlist.h>
  29
  30 #include <asm/cacheflush.h>
  31 #include <asm/dma.h>    /* for DMA_CHUNK_SIZE */
  32 #include <asm/io.h>
  33 #include <asm/page.h>   /* get_order */
  34 #include <asm/pgalloc.h>
  35 #include <asm/uaccess.h>
  36 #include <asm/tlbflush.h>       /* for purge_tlb_*() macros */
  37
  38 static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
  39 static unsigned long pcxl_used_bytes __read_mostly = 0;
  40 static unsigned long pcxl_used_pages __read_mostly = 0;
  41
  42 extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
  43 static spinlock_t   pcxl_res_lock;
  44 static char    *pcxl_res_map;
  45 static int     pcxl_res_hint;
  46 static int     pcxl_res_size;
  47
  48 #ifdef DEBUG_PCXL_RESOURCE
  49 #define DBG_RES(x...)   printk(x)
  50 #else
  51 #define DBG_RES(x...)
  52 #endif
  53
  54
  55 /*
  56 ** Dump a hex representation of the resource map.
  57 */
  58
  59 #ifdef DUMP_RESMAP
  60 static
  61 void dump_resmap(void)
  62 {
  63         u_long *res_ptr = (unsigned long *)pcxl_res_map;
  64         u_long i = 0;
  65
  66         printk("res_map: ");
  67         for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
  68                 printk("%08lx ", *res_ptr);
  69
  70         printk("\n");
  71 }
  72 #else
  73 static inline void dump_resmap(void) {;}
  74 #endif
  75
  76 static int pa11_dma_supported( struct device *dev, u64 mask)
  77 {
  78         return 1;
  79 }
  80
  81 static inline int map_pte_uncached(pte_t * pte,
  82                 unsigned long vaddr,
  83                 unsigned long size, unsigned long *paddr_ptr)
  84 {
  85         unsigned long end;
  86         unsigned long orig_vaddr = vaddr;
  87
  88         vaddr &= ~PMD_MASK;
  89         end = vaddr + size;
  90         if (end > PMD_SIZE)
  91                 end = PMD_SIZE;
  92         do {
  93                 if (!pte_none(*pte))
  94                         printk(KERN_ERR "map_pte_uncached: page already exists\n");
  95                 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
  96                 purge_tlb_start();
  97                 pdtlb_kernel(orig_vaddr);
  98                 purge_tlb_end();
  99                 vaddr += PAGE_SIZE;
 100                 orig_vaddr += PAGE_SIZE;
 101                 (*paddr_ptr) += PAGE_SIZE;
 102                 pte++;
 103         } while (vaddr < end);
 104         return 0;
 105 }
 106
 107 static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
 108                 unsigned long size, unsigned long *paddr_ptr)
 109 {
 110         unsigned long end;
 111         unsigned long orig_vaddr = vaddr;
 112
 113         vaddr &= ~PGDIR_MASK;
 114         end = vaddr + size;
 115         if (end > PGDIR_SIZE)
 116                 end = PGDIR_SIZE;
 117         do {
 118                 pte_t * pte = pte_alloc_kernel(pmd, vaddr);
 119                 if (!pte)
 120                         return -ENOMEM;
 121                 if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
 122                         return -ENOMEM;
 123                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
 124                 orig_vaddr += PMD_SIZE;
 125                 pmd++;
 126         } while (vaddr < end);
 127         return 0;
 128 }
 129
 130 static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
 131                 unsigned long paddr)
 132 {
 133         pgd_t * dir;
 134         unsigned long end = vaddr + size;
 135
 136         dir = pgd_offset_k(vaddr);
 137         do {
 138                 pmd_t *pmd;
 139
 140                 pmd = pmd_alloc(NULL, dir, vaddr);
 141                 if (!pmd)
 142                         return -ENOMEM;
 143                 if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
 144                         return -ENOMEM;
 145                 vaddr = vaddr + PGDIR_SIZE;
 146                 dir++;
 147         } while (vaddr && (vaddr < end));
 148         return 0;
 149 }
 150
 151 static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
 152                 unsigned long size)
 153 {
 154         pte_t * pte;
 155         unsigned long end;
 156         unsigned long orig_vaddr = vaddr;
 157
 158         if (pmd_none(*pmd))
 159                 return;
 160         if (pmd_bad(*pmd)) {
 161                 pmd_ERROR(*pmd);
 162                 pmd_clear(pmd);
 163                 return;
 164         }
 165         pte = pte_offset_map(pmd, vaddr);
 166         vaddr &= ~PMD_MASK;
 167         end = vaddr + size;
 168         if (end > PMD_SIZE)
 169                 end = PMD_SIZE;
 170         do {
 171                 pte_t page = *pte;
 172                 pte_clear(&init_mm, vaddr, pte);
 173                 purge_tlb_start();
 174                 pdtlb_kernel(orig_vaddr);
 175                 purge_tlb_end();
 176                 vaddr += PAGE_SIZE;
 177                 orig_vaddr += PAGE_SIZE;
 178                 pte++;
 179                 if (pte_none(page) || pte_present(page))
 180                         continue;
 181                 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
 182         } while (vaddr < end);
 183 }
 184
 185 static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
 186                 unsigned long size)
 187 {
 188         pmd_t * pmd;
 189         unsigned long end;
 190         unsigned long orig_vaddr = vaddr;
 191
 192         if (pgd_none(*dir))
 193                 return;
 194         if (pgd_bad(*dir)) {
 195                 pgd_ERROR(*dir);
 196                 pgd_clear(dir);
 197                 return;
 198         }
 199         pmd = pmd_offset(dir, vaddr);
 200         vaddr &= ~PGDIR_MASK;
 201         end = vaddr + size;
 202         if (end > PGDIR_SIZE)
 203                 end = PGDIR_SIZE;
 204         do {
 205                 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
 206                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
 207                 orig_vaddr += PMD_SIZE;
 208                 pmd++;
 209         } while (vaddr < end);
 210 }
 211
 212 static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
 213 {
 214         pgd_t * dir;
 215         unsigned long end = vaddr + size;
 216
 217         dir = pgd_offset_k(vaddr);
 218         do {
 219                 unmap_uncached_pmd(dir, vaddr, end - vaddr);
 220                 vaddr = vaddr + PGDIR_SIZE;
 221                 dir++;
 222         } while (vaddr && (vaddr < end));
 223 }
 224
 225 #define PCXL_SEARCH_LOOP(idx, mask, size)  \
 226        for(; res_ptr < res_end; ++res_ptr) \
 227        { \
 228                if(0 == ((*res_ptr) & mask)) { \
 229                        *res_ptr |= mask; \
 230                        idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
 231                        pcxl_res_hint = idx + (size >> 3); \
 232                        goto resource_found; \
 233                } \
 234        }
 235
 236 #define PCXL_FIND_FREE_MAPPING(idx, mask, size)  { \
 237        u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
 238        u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
 239        PCXL_SEARCH_LOOP(idx, mask, size); \
 240        res_ptr = (u##size *)&pcxl_res_map[0]; \
 241        PCXL_SEARCH_LOOP(idx, mask, size); \
 242 }
 243
 244 unsigned long
 245 pcxl_alloc_range(size_t size)
 246 {
 247         int res_idx;
 248         u_long mask, flags;
 249         unsigned int pages_needed = size >> PAGE_SHIFT;
 250
 251         mask = (u_long) -1L;
 252         mask >>= BITS_PER_LONG - pages_needed;
 253
 254         DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
 255                 size, pages_needed, mask);
 256
 257         spin_lock_irqsave(&pcxl_res_lock, flags);
 258
 259         if(pages_needed <= 8) {
 260                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
 261         } else if(pages_needed <= 16) {
 262                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
 263         } else if(pages_needed <= 32) {
 264                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
 265         } else {
 266                 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
 267                       __FILE__);
 268         }
 269
 270         dump_resmap();
 271         panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
 272               __FILE__);
 273
 274 resource_found:
 275
 276         DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
 277                 res_idx, mask, pcxl_res_hint);
 278
 279         pcxl_used_pages += pages_needed;
 280         pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
 281
 282         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 283
 284         dump_resmap();
 285
 286         /*
 287         ** return the corresponding vaddr in the pcxl dma map
 288         */
 289         return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
 290 }
 291
 292 #define PCXL_FREE_MAPPINGS(idx, m, size) \
 293                 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
 294                 /* BUG_ON((*res_ptr & m) != m); */ \
 295                 *res_ptr &= ~m;
 296
 297 /*
 298 ** clear bits in the pcxl resource map
 299 */
 300 static void
 301 pcxl_free_range(unsigned long vaddr, size_t size)
 302 {
 303         u_long mask, flags;
 304         unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
 305         unsigned int pages_mapped = size >> PAGE_SHIFT;
 306
 307         mask = (u_long) -1L;
 308         mask >>= BITS_PER_LONG - pages_mapped;
 309
 310         DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
 311                 res_idx, size, pages_mapped, mask);
 312
 313         spin_lock_irqsave(&pcxl_res_lock, flags);
 314
 315         if(pages_mapped <= 8) {
 316                 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
 317         } else if(pages_mapped <= 16) {
 318                 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
 319         } else if(pages_mapped <= 32) {
 320                 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
 321         } else {
 322                 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
 323                       __FILE__);
 324         }
 325
 326         pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
 327         pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
 328
 329         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 330
 331         dump_resmap();
 332 }
 333
 334 static int proc_pcxl_dma_show(struct seq_file *m, void *v)
 335 {
 336 #if 0
 337         u_long i = 0;
 338         unsigned long *res_ptr = (u_long *)pcxl_res_map;
 339 #endif
 340         unsigned long total_pages = pcxl_res_size << 3;   /* 8 bits per byte */
 341
 342         seq_printf(m, "\nDMA Mapping Area size    : %d bytes (%ld pages)\n",
 343                 PCXL_DMA_MAP_SIZE, total_pages);
 344
 345         seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
 346
 347         seq_puts(m,  "            total:    free:    used:   % used:\n");
 348         seq_printf(m, "blocks  %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
 349                 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
 350                 (pcxl_used_bytes * 100) / pcxl_res_size);
 351
 352         seq_printf(m, "pages   %8ld %8ld %8ld %8ld%%\n", total_pages,
 353                 total_pages - pcxl_used_pages, pcxl_used_pages,
 354                 (pcxl_used_pages * 100 / total_pages));
 355
 356 #if 0
 357         seq_puts(m, "\nResource bitmap:");
 358
 359         for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
 360                 if ((i & 7) == 0)
 361                     seq_puts(m,"\n   ");
 362                 seq_printf(m, "%s %08lx", buf, *res_ptr);
 363         }
 364 #endif
 365         seq_putc(m, '\n');
 366         return 0;
 367 }
 368
 369 static int proc_pcxl_dma_open(struct inode *inode, struct file *file)
 370 {
 371         return single_open(file, proc_pcxl_dma_show, NULL);
 372 }
 373
 374 static const struct file_operations proc_pcxl_dma_ops = {
 375         .owner          = THIS_MODULE,
 376         .open           = proc_pcxl_dma_open,
 377         .read           = seq_read,
 378         .llseek         = seq_lseek,
 379         .release        = single_release,
 380 };
 381
 382 static int __init
 383 pcxl_dma_init(void)
 384 {
 385         if (pcxl_dma_start == 0)
 386                 return 0;
 387
 388         spin_lock_init(&pcxl_res_lock);
 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_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag)
 412 {
 413         unsigned long vaddr;
 414         unsigned long paddr;
 415         int order;
 416
 417         order = get_order(size);
 418         size = 1 << (order + PAGE_SHIFT);
 419         vaddr = pcxl_alloc_range(size);
 420         paddr = __get_free_pages(flag, order);
 421         flush_kernel_dcache_range(paddr, size);
 422         paddr = __pa(paddr);
 423         map_uncached_pages(vaddr, size, paddr);
 424         *dma_handle = (dma_addr_t) paddr;
 425
 426 #if 0
 427 /* This probably isn't needed to support EISA cards.
 428 ** ISA cards will certainly only support 24-bit DMA addressing.
 429 ** Not clear if we can, want, or need to support ISA.
 430 */
 431         if (!dev || *dev->coherent_dma_mask < 0xffffffff)
 432                 gfp |= GFP_DMA;
 433 #endif
 434         return (void *)vaddr;
 435 }
 436
 437 static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle)
 438 {
 439         int order;
 440
 441         order = get_order(size);
 442         size = 1 << (order + PAGE_SHIFT);
 443         unmap_uncached_pages((unsigned long)vaddr, size);
 444         pcxl_free_range((unsigned long)vaddr, size);
 445         free_pages((unsigned long)__va(dma_handle), order);
 446 }
 447
 448 static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction)
 449 {
 450         BUG_ON(direction == DMA_NONE);
 451
 452         flush_kernel_dcache_range((unsigned long) addr, size);
 453         return virt_to_phys(addr);
 454 }
 455
 456 static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
 457 {
 458         BUG_ON(direction == DMA_NONE);
 459
 460         if (direction == DMA_TO_DEVICE)
 461             return;
 462
 463         /*
 464          * For PCI_DMA_FROMDEVICE this flush is not necessary for the
 465          * simple map/unmap case. However, it IS necessary if if
 466          * pci_dma_sync_single_* has been called and the buffer reused.
 467          */
 468
 469         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
 470         return;
 471 }
 472
 473 static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 474 {
 475         int i;
 476
 477         BUG_ON(direction == DMA_NONE);
 478
 479         for (i = 0; i < nents; i++, sglist++ ) {
 480                 unsigned long vaddr = sg_virt_addr(sglist);
 481                 sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr);
 482                 sg_dma_len(sglist) = sglist->length;
 483                 flush_kernel_dcache_range(vaddr, sglist->length);
 484         }
 485         return nents;
 486 }
 487
 488 static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 489 {
 490         int i;
 491
 492         BUG_ON(direction == DMA_NONE);
 493
 494         if (direction == DMA_TO_DEVICE)
 495             return;
 496
 497         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 498
 499         for (i = 0; i < nents; i++, sglist++ )
 500                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 501         return;
 502 }
 503
 504 static void pa11_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction)
 505 {
 506         BUG_ON(direction == DMA_NONE);
 507
 508         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
 509 }
 510
 511 static void pa11_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction)
 512 {
 513         BUG_ON(direction == DMA_NONE);
 514
 515         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
 516 }
 517
 518 static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 519 {
 520         int i;
 521
 522         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 523
 524         for (i = 0; i < nents; i++, sglist++ )
 525                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 526 }
 527
 528 static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 529 {
 530         int i;
 531
 532         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 533
 534         for (i = 0; i < nents; i++, sglist++ )
 535                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 536 }
 537
 538 struct hppa_dma_ops pcxl_dma_ops = {
 539         .dma_supported =        pa11_dma_supported,
 540         .alloc_consistent =     pa11_dma_alloc_consistent,
 541         .alloc_noncoherent =    pa11_dma_alloc_consistent,
 542         .free_consistent =      pa11_dma_free_consistent,
 543         .map_single =           pa11_dma_map_single,
 544         .unmap_single =         pa11_dma_unmap_single,
 545         .map_sg =               pa11_dma_map_sg,
 546         .unmap_sg =             pa11_dma_unmap_sg,
 547         .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
 548         .dma_sync_single_for_device = pa11_dma_sync_single_for_device,
 549         .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
 550         .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device,
 551 };
 552
 553 static void *fail_alloc_consistent(struct device *dev, size_t size,
 554                                    dma_addr_t *dma_handle, gfp_t flag)
 555 {
 556         return NULL;
 557 }
 558
 559 static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size,
 560                                           dma_addr_t *dma_handle, gfp_t flag)
 561 {
 562         void *addr;
 563
 564         addr = (void *)__get_free_pages(flag, get_order(size));
 565         if (addr)
 566                 *dma_handle = (dma_addr_t)virt_to_phys(addr);
 567
 568         return addr;
 569 }
 570
 571 static void pa11_dma_free_noncoherent(struct device *dev, size_t size,
 572                                         void *vaddr, dma_addr_t iova)
 573 {
 574         free_pages((unsigned long)vaddr, get_order(size));
 575         return;
 576 }
 577
 578 struct hppa_dma_ops pcx_dma_ops = {
 579         .dma_supported =        pa11_dma_supported,
 580         .alloc_consistent =     fail_alloc_consistent,
 581         .alloc_noncoherent =    pa11_dma_alloc_noncoherent,
 582         .free_consistent =      pa11_dma_free_noncoherent,
 583         .map_single =           pa11_dma_map_single,
 584         .unmap_single =         pa11_dma_unmap_single,
 585         .map_sg =               pa11_dma_map_sg,
 586         .unmap_sg =             pa11_dma_unmap_sg,
 587         .dma_sync_single_for_cpu =      pa11_dma_sync_single_for_cpu,
 588         .dma_sync_single_for_device =   pa11_dma_sync_single_for_device,
 589         .dma_sync_sg_for_cpu =          pa11_dma_sync_sg_for_cpu,
 590         .dma_sync_sg_for_device =       pa11_dma_sync_sg_for_device,
 591 };