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-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
  29 #include <asm/cacheflush.h>
  30 #include <asm/dma.h>    /* for DMA_CHUNK_SIZE */
  31 #include <asm/io.h>
  32 #include <asm/page.h>   /* get_order */
  33 #include <asm/pgalloc.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/tlbflush.h>       /* for purge_tlb_*() macros */
  36
  37 static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
  38 static unsigned long pcxl_used_bytes __read_mostly = 0;
  39 static unsigned long pcxl_used_pages __read_mostly = 0;
  40
  41 extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
  42 static spinlock_t   pcxl_res_lock;
  43 static char    *pcxl_res_map;
  44 static int     pcxl_res_hint;
  45 static int     pcxl_res_size;
  46
  47 #ifdef DEBUG_PCXL_RESOURCE
  48 #define DBG_RES(x...)   printk(x)
  49 #else
  50 #define DBG_RES(x...)
  51 #endif
  52
  53
  54 /*
  55 ** Dump a hex representation of the resource map.
  56 */
  57
  58 #ifdef DUMP_RESMAP
  59 static
  60 void dump_resmap(void)
  61 {
  62         u_long *res_ptr = (unsigned long *)pcxl_res_map;
  63         u_long i = 0;
  64
  65         printk("res_map: ");
  66         for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
  67                 printk("%08lx ", *res_ptr);
  68
  69         printk("\n");
  70 }
  71 #else
  72 static inline void dump_resmap(void) {;}
  73 #endif
  74
  75 static int pa11_dma_supported( struct device *dev, u64 mask)
  76 {
  77         return 1;
  78 }
  79
  80 static inline int map_pte_uncached(pte_t * pte,
  81                 unsigned long vaddr,
  82                 unsigned long size, unsigned long *paddr_ptr)
  83 {
  84         unsigned long end;
  85         unsigned long orig_vaddr = vaddr;
  86
  87         vaddr &= ~PMD_MASK;
  88         end = vaddr + size;
  89         if (end > PMD_SIZE)
  90                 end = PMD_SIZE;
  91         do {
  92                 if (!pte_none(*pte))
  93                         printk(KERN_ERR "map_pte_uncached: page already exists\n");
  94                 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
  95                 purge_tlb_start();
  96                 pdtlb_kernel(orig_vaddr);
  97                 purge_tlb_end();
  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                 pte_t page = *pte;
 171                 pte_clear(&init_mm, vaddr, pte);
 172                 purge_tlb_start();
 173                 pdtlb_kernel(orig_vaddr);
 174                 purge_tlb_end();
 175                 vaddr += PAGE_SIZE;
 176                 orig_vaddr += PAGE_SIZE;
 177                 pte++;
 178                 if (pte_none(page) || pte_present(page))
 179                         continue;
 180                 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
 181         } while (vaddr < end);
 182 }
 183
 184 static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
 185                 unsigned long size)
 186 {
 187         pmd_t * pmd;
 188         unsigned long end;
 189         unsigned long orig_vaddr = vaddr;
 190
 191         if (pgd_none(*dir))
 192                 return;
 193         if (pgd_bad(*dir)) {
 194                 pgd_ERROR(*dir);
 195                 pgd_clear(dir);
 196                 return;
 197         }
 198         pmd = pmd_offset(dir, vaddr);
 199         vaddr &= ~PGDIR_MASK;
 200         end = vaddr + size;
 201         if (end > PGDIR_SIZE)
 202                 end = PGDIR_SIZE;
 203         do {
 204                 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
 205                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
 206                 orig_vaddr += PMD_SIZE;
 207                 pmd++;
 208         } while (vaddr < end);
 209 }
 210
 211 static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
 212 {
 213         pgd_t * dir;
 214         unsigned long end = vaddr + size;
 215
 216         dir = pgd_offset_k(vaddr);
 217         do {
 218                 unmap_uncached_pmd(dir, vaddr, end - vaddr);
 219                 vaddr = vaddr + PGDIR_SIZE;
 220                 dir++;
 221         } while (vaddr && (vaddr < end));
 222 }
 223
 224 #define PCXL_SEARCH_LOOP(idx, mask, size)  \
 225        for(; res_ptr < res_end; ++res_ptr) \
 226        { \
 227                if(0 == ((*res_ptr) & mask)) { \
 228                        *res_ptr |= mask; \
 229                        idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
 230                        pcxl_res_hint = idx + (size >> 3); \
 231                        goto resource_found; \
 232                } \
 233        }
 234
 235 #define PCXL_FIND_FREE_MAPPING(idx, mask, size)  { \
 236        u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
 237        u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
 238        PCXL_SEARCH_LOOP(idx, mask, size); \
 239        res_ptr = (u##size *)&pcxl_res_map[0]; \
 240        PCXL_SEARCH_LOOP(idx, mask, size); \
 241 }
 242
 243 unsigned long
 244 pcxl_alloc_range(size_t size)
 245 {
 246         int res_idx;
 247         u_long mask, flags;
 248         unsigned int pages_needed = size >> PAGE_SHIFT;
 249
 250         mask = (u_long) -1L;
 251         mask >>= BITS_PER_LONG - pages_needed;
 252
 253         DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
 254                 size, pages_needed, mask);
 255
 256         spin_lock_irqsave(&pcxl_res_lock, flags);
 257
 258         if(pages_needed <= 8) {
 259                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
 260         } else if(pages_needed <= 16) {
 261                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
 262         } else if(pages_needed <= 32) {
 263                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
 264         } else {
 265                 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
 266                       __FILE__);
 267         }
 268
 269         dump_resmap();
 270         panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
 271               __FILE__);
 272
 273 resource_found:
 274
 275         DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
 276                 res_idx, mask, pcxl_res_hint);
 277
 278         pcxl_used_pages += pages_needed;
 279         pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
 280
 281         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 282
 283         dump_resmap();
 284
 285         /*
 286         ** return the corresponding vaddr in the pcxl dma map
 287         */
 288         return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
 289 }
 290
 291 #define PCXL_FREE_MAPPINGS(idx, m, size) \
 292                 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
 293                 /* BUG_ON((*res_ptr & m) != m); */ \
 294                 *res_ptr &= ~m;
 295
 296 /*
 297 ** clear bits in the pcxl resource map
 298 */
 299 static void
 300 pcxl_free_range(unsigned long vaddr, size_t size)
 301 {
 302         u_long mask, flags;
 303         unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
 304         unsigned int pages_mapped = size >> PAGE_SHIFT;
 305
 306         mask = (u_long) -1L;
 307         mask >>= BITS_PER_LONG - pages_mapped;
 308
 309         DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
 310                 res_idx, size, pages_mapped, mask);
 311
 312         spin_lock_irqsave(&pcxl_res_lock, flags);
 313
 314         if(pages_mapped <= 8) {
 315                 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
 316         } else if(pages_mapped <= 16) {
 317                 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
 318         } else if(pages_mapped <= 32) {
 319                 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
 320         } else {
 321                 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
 322                       __FILE__);
 323         }
 324
 325         pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
 326         pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
 327
 328         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 329
 330         dump_resmap();
 331 }
 332
 333 static int proc_pcxl_dma_show(struct seq_file *m, void *v)
 334 {
 335 #if 0
 336         u_long i = 0;
 337         unsigned long *res_ptr = (u_long *)pcxl_res_map;
 338 #endif
 339         unsigned long total_pages = pcxl_res_size << 3;   /* 8 bits per byte */
 340
 341         seq_printf(m, "\nDMA Mapping Area size    : %d bytes (%ld pages)\n",
 342                 PCXL_DMA_MAP_SIZE, total_pages);
 343
 344         seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
 345
 346         seq_puts(m,  "            total:    free:    used:   % used:\n");
 347         seq_printf(m, "blocks  %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
 348                 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
 349                 (pcxl_used_bytes * 100) / pcxl_res_size);
 350
 351         seq_printf(m, "pages   %8ld %8ld %8ld %8ld%%\n", total_pages,
 352                 total_pages - pcxl_used_pages, pcxl_used_pages,
 353                 (pcxl_used_pages * 100 / total_pages));
 354
 355 #if 0
 356         seq_puts(m, "\nResource bitmap:");
 357
 358         for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
 359                 if ((i & 7) == 0)
 360                     seq_puts(m,"\n   ");
 361                 seq_printf(m, "%s %08lx", buf, *res_ptr);
 362         }
 363 #endif
 364         seq_putc(m, '\n');
 365         return 0;
 366 }
 367
 368 static int proc_pcxl_dma_open(struct inode *inode, struct file *file)
 369 {
 370         return single_open(file, proc_pcxl_dma_show, NULL);
 371 }
 372
 373 static const struct file_operations proc_pcxl_dma_ops = {
 374         .owner          = THIS_MODULE,
 375         .open           = proc_pcxl_dma_open,
 376         .read           = seq_read,
 377         .llseek         = seq_lseek,
 378         .release        = single_release,
 379 };
 380
 381 static int __init
 382 pcxl_dma_init(void)
 383 {
 384         if (pcxl_dma_start == 0)
 385                 return 0;
 386
 387         spin_lock_init(&pcxl_res_lock);
 388         pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
 389         pcxl_res_hint = 0;
 390         pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
 391                                             get_order(pcxl_res_size));
 392         memset(pcxl_res_map, 0, pcxl_res_size);
 393         proc_gsc_root = proc_mkdir("gsc", NULL);
 394         if (!proc_gsc_root)
 395                 printk(KERN_WARNING
 396                         "pcxl_dma_init: Unable to create gsc /proc dir entry\n");
 397         else {
 398                 struct proc_dir_entry* ent;
 399                 ent = create_proc_entry("pcxl_dma", 0, proc_gsc_root);
 400                 if (ent)
 401                         ent->proc_fops = &proc_pcxl_dma_ops;
 402                 else
 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         if (direction == DMA_NONE) {
 451                 printk(KERN_ERR "pa11_dma_map_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
 452                 BUG();
 453         }
 454
 455         flush_kernel_dcache_range((unsigned long) addr, size);
 456         return virt_to_phys(addr);
 457 }
 458
 459 static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
 460 {
 461         if (direction == DMA_NONE) {
 462                 printk(KERN_ERR "pa11_dma_unmap_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
 463                 BUG();
 464         }
 465
 466         if (direction == DMA_TO_DEVICE)
 467             return;
 468
 469         /*
 470          * For PCI_DMA_FROMDEVICE this flush is not necessary for the
 471          * simple map/unmap case. However, it IS necessary if if
 472          * pci_dma_sync_single_* has been called and the buffer reused.
 473          */
 474
 475         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
 476         return;
 477 }
 478
 479 static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 480 {
 481         int i;
 482
 483         if (direction == DMA_NONE)
 484             BUG();
 485
 486         for (i = 0; i < nents; i++, sglist++ ) {
 487                 unsigned long vaddr = sg_virt_addr(sglist);
 488                 sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr);
 489                 sg_dma_len(sglist) = sglist->length;
 490                 flush_kernel_dcache_range(vaddr, sglist->length);
 491         }
 492         return nents;
 493 }
 494
 495 static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 496 {
 497         int i;
 498
 499         if (direction == DMA_NONE)
 500             BUG();
 501
 502         if (direction == DMA_TO_DEVICE)
 503             return;
 504
 505         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 506
 507         for (i = 0; i < nents; i++, sglist++ )
 508                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 509         return;
 510 }
 511
 512 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)
 513 {
 514         if (direction == DMA_NONE)
 515             BUG();
 516
 517         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
 518 }
 519
 520 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)
 521 {
 522         if (direction == DMA_NONE)
 523             BUG();
 524
 525         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
 526 }
 527
 528 static void pa11_dma_sync_sg_for_cpu(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 static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 539 {
 540         int i;
 541
 542         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 543
 544         for (i = 0; i < nents; i++, sglist++ )
 545                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 546 }
 547
 548 struct hppa_dma_ops pcxl_dma_ops = {
 549         .dma_supported =        pa11_dma_supported,
 550         .alloc_consistent =     pa11_dma_alloc_consistent,
 551         .alloc_noncoherent =    pa11_dma_alloc_consistent,
 552         .free_consistent =      pa11_dma_free_consistent,
 553         .map_single =           pa11_dma_map_single,
 554         .unmap_single =         pa11_dma_unmap_single,
 555         .map_sg =               pa11_dma_map_sg,
 556         .unmap_sg =             pa11_dma_unmap_sg,
 557         .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
 558         .dma_sync_single_for_device = pa11_dma_sync_single_for_device,
 559         .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
 560         .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device,
 561 };
 562
 563 static void *fail_alloc_consistent(struct device *dev, size_t size,
 564                                    dma_addr_t *dma_handle, gfp_t flag)
 565 {
 566         return NULL;
 567 }
 568
 569 static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size,
 570                                           dma_addr_t *dma_handle, gfp_t flag)
 571 {
 572         void *addr = NULL;
 573
 574         /* rely on kmalloc to be cacheline aligned */
 575         addr = kmalloc(size, flag);
 576         if(addr)
 577                 *dma_handle = (dma_addr_t)virt_to_phys(addr);
 578
 579         return addr;
 580 }
 581
 582 static void pa11_dma_free_noncoherent(struct device *dev, size_t size,
 583                                         void *vaddr, dma_addr_t iova)
 584 {
 585         kfree(vaddr);
 586         return;
 587 }
 588
 589 struct hppa_dma_ops pcx_dma_ops = {
 590         .dma_supported =        pa11_dma_supported,
 591         .alloc_consistent =     fail_alloc_consistent,
 592         .alloc_noncoherent =    pa11_dma_alloc_noncoherent,
 593         .free_consistent =      pa11_dma_free_noncoherent,
 594         .map_single =           pa11_dma_map_single,
 595         .unmap_single =         pa11_dma_unmap_single,
 596         .map_sg =               pa11_dma_map_sg,
 597         .unmap_sg =             pa11_dma_unmap_sg,
 598         .dma_sync_single_for_cpu =      pa11_dma_sync_single_for_cpu,
 599         .dma_sync_single_for_device =   pa11_dma_sync_single_for_device,
 600         .dma_sync_sg_for_cpu =          pa11_dma_sync_sg_for_cpu,
 601         .dma_sync_sg_for_device =       pa11_dma_sync_sg_for_device,
 602 };