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/DMA-API-HOWTO.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/gfp.h>
  22 #include <linux/mm.h>
  23 #include <linux/pci.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/string.h>
  27 #include <linux/types.h>
  28 #include <linux/scatterlist.h>
  29 #include <linux/export.h>
  30
  31 #include <asm/cacheflush.h>
  32 #include <asm/dma.h>    /* for DMA_CHUNK_SIZE */
  33 #include <asm/io.h>
  34 #include <asm/page.h>   /* get_order */
  35 #include <asm/pgalloc.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/tlbflush.h>       /* for purge_tlb_*() macros */
  38
  39 static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
  40 static unsigned long pcxl_used_bytes __read_mostly = 0;
  41 static unsigned long pcxl_used_pages __read_mostly = 0;
  42
  43 extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
  44 static spinlock_t   pcxl_res_lock;
  45 static char    *pcxl_res_map;
  46 static int     pcxl_res_hint;
  47 static int     pcxl_res_size;
  48
  49 #ifdef DEBUG_PCXL_RESOURCE
  50 #define DBG_RES(x...)   printk(x)
  51 #else
  52 #define DBG_RES(x...)
  53 #endif
  54
  55
  56 /*
  57 ** Dump a hex representation of the resource map.
  58 */
  59
  60 #ifdef DUMP_RESMAP
  61 static
  62 void dump_resmap(void)
  63 {
  64         u_long *res_ptr = (unsigned long *)pcxl_res_map;
  65         u_long i = 0;
  66
  67         printk("res_map: ");
  68         for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
  69                 printk("%08lx ", *res_ptr);
  70
  71         printk("\n");
  72 }
  73 #else
  74 static inline void dump_resmap(void) {;}
  75 #endif
  76
  77 static int pa11_dma_supported( struct device *dev, u64 mask)
  78 {
  79         return 1;
  80 }
  81
  82 static inline int map_pte_uncached(pte_t * pte,
  83                 unsigned long vaddr,
  84                 unsigned long size, unsigned long *paddr_ptr)
  85 {
  86         unsigned long end;
  87         unsigned long orig_vaddr = vaddr;
  88
  89         vaddr &= ~PMD_MASK;
  90         end = vaddr + size;
  91         if (end > PMD_SIZE)
  92                 end = PMD_SIZE;
  93         do {
  94                 unsigned long flags;
  95
  96                 if (!pte_none(*pte))
  97                         printk(KERN_ERR "map_pte_uncached: page already exists\n");
  98                 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
  99                 purge_tlb_start(flags);
 100                 pdtlb_kernel(orig_vaddr);
 101                 purge_tlb_end(flags);
 102                 vaddr += PAGE_SIZE;
 103                 orig_vaddr += PAGE_SIZE;
 104                 (*paddr_ptr) += PAGE_SIZE;
 105                 pte++;
 106         } while (vaddr < end);
 107         return 0;
 108 }
 109
 110 static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
 111                 unsigned long size, unsigned long *paddr_ptr)
 112 {
 113         unsigned long end;
 114         unsigned long orig_vaddr = vaddr;
 115
 116         vaddr &= ~PGDIR_MASK;
 117         end = vaddr + size;
 118         if (end > PGDIR_SIZE)
 119                 end = PGDIR_SIZE;
 120         do {
 121                 pte_t * pte = pte_alloc_kernel(pmd, vaddr);
 122                 if (!pte)
 123                         return -ENOMEM;
 124                 if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
 125                         return -ENOMEM;
 126                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
 127                 orig_vaddr += PMD_SIZE;
 128                 pmd++;
 129         } while (vaddr < end);
 130         return 0;
 131 }
 132
 133 static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
 134                 unsigned long paddr)
 135 {
 136         pgd_t * dir;
 137         unsigned long end = vaddr + size;
 138
 139         dir = pgd_offset_k(vaddr);
 140         do {
 141                 pmd_t *pmd;
 142
 143                 pmd = pmd_alloc(NULL, dir, vaddr);
 144                 if (!pmd)
 145                         return -ENOMEM;
 146                 if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
 147                         return -ENOMEM;
 148                 vaddr = vaddr + PGDIR_SIZE;
 149                 dir++;
 150         } while (vaddr && (vaddr < end));
 151         return 0;
 152 }
 153
 154 static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
 155                 unsigned long size)
 156 {
 157         pte_t * pte;
 158         unsigned long end;
 159         unsigned long orig_vaddr = vaddr;
 160
 161         if (pmd_none(*pmd))
 162                 return;
 163         if (pmd_bad(*pmd)) {
 164                 pmd_ERROR(*pmd);
 165                 pmd_clear(pmd);
 166                 return;
 167         }
 168         pte = pte_offset_map(pmd, vaddr);
 169         vaddr &= ~PMD_MASK;
 170         end = vaddr + size;
 171         if (end > PMD_SIZE)
 172                 end = PMD_SIZE;
 173         do {
 174                 unsigned long flags;
 175                 pte_t page = *pte;
 176
 177                 pte_clear(&init_mm, vaddr, pte);
 178                 purge_tlb_start(flags);
 179                 pdtlb_kernel(orig_vaddr);
 180                 purge_tlb_end(flags);
 181                 vaddr += PAGE_SIZE;
 182                 orig_vaddr += PAGE_SIZE;
 183                 pte++;
 184                 if (pte_none(page) || pte_present(page))
 185                         continue;
 186                 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
 187         } while (vaddr < end);
 188 }
 189
 190 static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
 191                 unsigned long size)
 192 {
 193         pmd_t * pmd;
 194         unsigned long end;
 195         unsigned long orig_vaddr = vaddr;
 196
 197         if (pgd_none(*dir))
 198                 return;
 199         if (pgd_bad(*dir)) {
 200                 pgd_ERROR(*dir);
 201                 pgd_clear(dir);
 202                 return;
 203         }
 204         pmd = pmd_offset(dir, vaddr);
 205         vaddr &= ~PGDIR_MASK;
 206         end = vaddr + size;
 207         if (end > PGDIR_SIZE)
 208                 end = PGDIR_SIZE;
 209         do {
 210                 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
 211                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
 212                 orig_vaddr += PMD_SIZE;
 213                 pmd++;
 214         } while (vaddr < end);
 215 }
 216
 217 static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
 218 {
 219         pgd_t * dir;
 220         unsigned long end = vaddr + size;
 221
 222         dir = pgd_offset_k(vaddr);
 223         do {
 224                 unmap_uncached_pmd(dir, vaddr, end - vaddr);
 225                 vaddr = vaddr + PGDIR_SIZE;
 226                 dir++;
 227         } while (vaddr && (vaddr < end));
 228 }
 229
 230 #define PCXL_SEARCH_LOOP(idx, mask, size)  \
 231        for(; res_ptr < res_end; ++res_ptr) \
 232        { \
 233                if(0 == ((*res_ptr) & mask)) { \
 234                        *res_ptr |= mask; \
 235                        idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
 236                        pcxl_res_hint = idx + (size >> 3); \
 237                        goto resource_found; \
 238                } \
 239        }
 240
 241 #define PCXL_FIND_FREE_MAPPING(idx, mask, size)  { \
 242        u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
 243        u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
 244        PCXL_SEARCH_LOOP(idx, mask, size); \
 245        res_ptr = (u##size *)&pcxl_res_map[0]; \
 246        PCXL_SEARCH_LOOP(idx, mask, size); \
 247 }
 248
 249 unsigned long
 250 pcxl_alloc_range(size_t size)
 251 {
 252         int res_idx;
 253         u_long mask, flags;
 254         unsigned int pages_needed = size >> PAGE_SHIFT;
 255
 256         mask = (u_long) -1L;
 257         mask >>= BITS_PER_LONG - pages_needed;
 258
 259         DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
 260                 size, pages_needed, mask);
 261
 262         spin_lock_irqsave(&pcxl_res_lock, flags);
 263
 264         if(pages_needed <= 8) {
 265                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
 266         } else if(pages_needed <= 16) {
 267                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
 268         } else if(pages_needed <= 32) {
 269                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
 270         } else {
 271                 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
 272                       __FILE__);
 273         }
 274
 275         dump_resmap();
 276         panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
 277               __FILE__);
 278
 279 resource_found:
 280
 281         DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
 282                 res_idx, mask, pcxl_res_hint);
 283
 284         pcxl_used_pages += pages_needed;
 285         pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
 286
 287         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 288
 289         dump_resmap();
 290
 291         /*
 292         ** return the corresponding vaddr in the pcxl dma map
 293         */
 294         return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
 295 }
 296
 297 #define PCXL_FREE_MAPPINGS(idx, m, size) \
 298                 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
 299                 /* BUG_ON((*res_ptr & m) != m); */ \
 300                 *res_ptr &= ~m;
 301
 302 /*
 303 ** clear bits in the pcxl resource map
 304 */
 305 static void
 306 pcxl_free_range(unsigned long vaddr, size_t size)
 307 {
 308         u_long mask, flags;
 309         unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
 310         unsigned int pages_mapped = size >> PAGE_SHIFT;
 311
 312         mask = (u_long) -1L;
 313         mask >>= BITS_PER_LONG - pages_mapped;
 314
 315         DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
 316                 res_idx, size, pages_mapped, mask);
 317
 318         spin_lock_irqsave(&pcxl_res_lock, flags);
 319
 320         if(pages_mapped <= 8) {
 321                 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
 322         } else if(pages_mapped <= 16) {
 323                 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
 324         } else if(pages_mapped <= 32) {
 325                 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
 326         } else {
 327                 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
 328                       __FILE__);
 329         }
 330
 331         pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
 332         pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
 333
 334         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 335
 336         dump_resmap();
 337 }
 338
 339 static int proc_pcxl_dma_show(struct seq_file *m, void *v)
 340 {
 341 #if 0
 342         u_long i = 0;
 343         unsigned long *res_ptr = (u_long *)pcxl_res_map;
 344 #endif
 345         unsigned long total_pages = pcxl_res_size << 3;   /* 8 bits per byte */
 346
 347         seq_printf(m, "\nDMA Mapping Area size    : %d bytes (%ld pages)\n",
 348                 PCXL_DMA_MAP_SIZE, total_pages);
 349
 350         seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
 351
 352         seq_puts(m,  "            total:    free:    used:   % used:\n");
 353         seq_printf(m, "blocks  %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
 354                 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
 355                 (pcxl_used_bytes * 100) / pcxl_res_size);
 356
 357         seq_printf(m, "pages   %8ld %8ld %8ld %8ld%%\n", total_pages,
 358                 total_pages - pcxl_used_pages, pcxl_used_pages,
 359                 (pcxl_used_pages * 100 / total_pages));
 360
 361 #if 0
 362         seq_puts(m, "\nResource bitmap:");
 363
 364         for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
 365                 if ((i & 7) == 0)
 366                     seq_puts(m,"\n   ");
 367                 seq_printf(m, "%s %08lx", buf, *res_ptr);
 368         }
 369 #endif
 370         seq_putc(m, '\n');
 371         return 0;
 372 }
 373
 374 static int proc_pcxl_dma_open(struct inode *inode, struct file *file)
 375 {
 376         return single_open(file, proc_pcxl_dma_show, NULL);
 377 }
 378
 379 static const struct file_operations proc_pcxl_dma_ops = {
 380         .owner          = THIS_MODULE,
 381         .open           = proc_pcxl_dma_open,
 382         .read           = seq_read,
 383         .llseek         = seq_lseek,
 384         .release        = single_release,
 385 };
 386
 387 static int __init
 388 pcxl_dma_init(void)
 389 {
 390         if (pcxl_dma_start == 0)
 391                 return 0;
 392
 393         spin_lock_init(&pcxl_res_lock);
 394         pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
 395         pcxl_res_hint = 0;
 396         pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
 397                                             get_order(pcxl_res_size));
 398         memset(pcxl_res_map, 0, pcxl_res_size);
 399         proc_gsc_root = proc_mkdir("gsc", NULL);
 400         if (!proc_gsc_root)
 401                 printk(KERN_WARNING
 402                         "pcxl_dma_init: Unable to create gsc /proc dir entry\n");
 403         else {
 404                 struct proc_dir_entry* ent;
 405                 ent = proc_create("pcxl_dma", 0, proc_gsc_root,
 406                                   &proc_pcxl_dma_ops);
 407                 if (!ent)
 408                         printk(KERN_WARNING
 409                                 "pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
 410         }
 411         return 0;
 412 }
 413
 414 __initcall(pcxl_dma_init);
 415
 416 static void * pa11_dma_alloc_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag)
 417 {
 418         unsigned long vaddr;
 419         unsigned long paddr;
 420         int order;
 421
 422         order = get_order(size);
 423         size = 1 << (order + PAGE_SHIFT);
 424         vaddr = pcxl_alloc_range(size);
 425         paddr = __get_free_pages(flag, order);
 426         flush_kernel_dcache_range(paddr, size);
 427         paddr = __pa(paddr);
 428         map_uncached_pages(vaddr, size, paddr);
 429         *dma_handle = (dma_addr_t) paddr;
 430
 431 #if 0
 432 /* This probably isn't needed to support EISA cards.
 433 ** ISA cards will certainly only support 24-bit DMA addressing.
 434 ** Not clear if we can, want, or need to support ISA.
 435 */
 436         if (!dev || *dev->coherent_dma_mask < 0xffffffff)
 437                 gfp |= GFP_DMA;
 438 #endif
 439         return (void *)vaddr;
 440 }
 441
 442 static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle)
 443 {
 444         int order;
 445
 446         order = get_order(size);
 447         size = 1 << (order + PAGE_SHIFT);
 448         unmap_uncached_pages((unsigned long)vaddr, size);
 449         pcxl_free_range((unsigned long)vaddr, size);
 450         free_pages((unsigned long)__va(dma_handle), order);
 451 }
 452
 453 static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction)
 454 {
 455         BUG_ON(direction == DMA_NONE);
 456
 457         flush_kernel_dcache_range((unsigned long) addr, size);
 458         return virt_to_phys(addr);
 459 }
 460
 461 static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
 462 {
 463         BUG_ON(direction == DMA_NONE);
 464
 465         if (direction == DMA_TO_DEVICE)
 466             return;
 467
 468         /*
 469          * For PCI_DMA_FROMDEVICE this flush is not necessary for the
 470          * simple map/unmap case. However, it IS necessary if if
 471          * pci_dma_sync_single_* has been called and the buffer reused.
 472          */
 473
 474         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
 475         return;
 476 }
 477
 478 static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 479 {
 480         int i;
 481
 482         BUG_ON(direction == DMA_NONE);
 483
 484         for (i = 0; i < nents; i++, sglist++ ) {
 485                 unsigned long vaddr = sg_virt_addr(sglist);
 486                 sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr);
 487                 sg_dma_len(sglist) = sglist->length;
 488                 flush_kernel_dcache_range(vaddr, sglist->length);
 489         }
 490         return nents;
 491 }
 492
 493 static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 494 {
 495         int i;
 496
 497         BUG_ON(direction == DMA_NONE);
 498
 499         if (direction == DMA_TO_DEVICE)
 500             return;
 501
 502         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 503
 504         for (i = 0; i < nents; i++, sglist++ )
 505                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 506         return;
 507 }
 508
 509 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)
 510 {
 511         BUG_ON(direction == DMA_NONE);
 512
 513         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
 514 }
 515
 516 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)
 517 {
 518         BUG_ON(direction == DMA_NONE);
 519
 520         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
 521 }
 522
 523 static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 524 {
 525         int i;
 526
 527         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 528
 529         for (i = 0; i < nents; i++, sglist++ )
 530                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 531 }
 532
 533 static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 534 {
 535         int i;
 536
 537         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 538
 539         for (i = 0; i < nents; i++, sglist++ )
 540                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 541 }
 542
 543 struct hppa_dma_ops pcxl_dma_ops = {
 544         .dma_supported =        pa11_dma_supported,
 545         .alloc_consistent =     pa11_dma_alloc_consistent,
 546         .alloc_noncoherent =    pa11_dma_alloc_consistent,
 547         .free_consistent =      pa11_dma_free_consistent,
 548         .map_single =           pa11_dma_map_single,
 549         .unmap_single =         pa11_dma_unmap_single,
 550         .map_sg =               pa11_dma_map_sg,
 551         .unmap_sg =             pa11_dma_unmap_sg,
 552         .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
 553         .dma_sync_single_for_device = pa11_dma_sync_single_for_device,
 554         .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
 555         .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device,
 556 };
 557
 558 static void *fail_alloc_consistent(struct device *dev, size_t size,
 559                                    dma_addr_t *dma_handle, gfp_t flag)
 560 {
 561         return NULL;
 562 }
 563
 564 static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size,
 565                                           dma_addr_t *dma_handle, gfp_t flag)
 566 {
 567         void *addr;
 568
 569         addr = (void *)__get_free_pages(flag, get_order(size));
 570         if (addr)
 571                 *dma_handle = (dma_addr_t)virt_to_phys(addr);
 572
 573         return addr;
 574 }
 575
 576 static void pa11_dma_free_noncoherent(struct device *dev, size_t size,
 577                                         void *vaddr, dma_addr_t iova)
 578 {
 579         free_pages((unsigned long)vaddr, get_order(size));
 580         return;
 581 }
 582
 583 struct hppa_dma_ops pcx_dma_ops = {
 584         .dma_supported =        pa11_dma_supported,
 585         .alloc_consistent =     fail_alloc_consistent,
 586         .alloc_noncoherent =    pa11_dma_alloc_noncoherent,
 587         .free_consistent =      pa11_dma_free_noncoherent,
 588         .map_single =           pa11_dma_map_single,
 589         .unmap_single =         pa11_dma_unmap_single,
 590         .map_sg =               pa11_dma_map_sg,
 591         .unmap_sg =             pa11_dma_unmap_sg,
 592         .dma_sync_single_for_cpu =      pa11_dma_sync_single_for_cpu,
 593         .dma_sync_single_for_device =   pa11_dma_sync_single_for_device,
 594         .dma_sync_sg_for_cpu =          pa11_dma_sync_sg_for_cpu,
 595         .dma_sync_sg_for_device =       pa11_dma_sync_sg_for_device,
 596 };