arch/mips/jazz/jazzdma.c

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This source file includes following definitions.
vdma_pgtbl_init
vdma_init
vdma_alloc
vdma_free
vdma_remap
vdma_phys2log
vdma_log2phys
vdma_stats
vdma_enable
vdma_disable
vdma_set_mode
vdma_set_addr
vdma_set_count
vdma_get_residue
vdma_get_enable
jazz_dma_alloc
jazz_dma_free
jazz_dma_map_page
jazz_dma_unmap_page
jazz_dma_map_sg
jazz_dma_unmap_sg
jazz_dma_sync_single_for_device
jazz_dma_sync_single_for_cpu
jazz_dma_sync_sg_for_device
jazz_dma_sync_sg_for_cpu
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Mips Jazz DMA controller support
   4  * Copyright (C) 1995, 1996 by Andreas Busse
   5  *
   6  * NOTE: Some of the argument checking could be removed when
   7  * things have settled down. Also, instead of returning 0xffffffff
   8  * on failure of vdma_alloc() one could leave page #0 unused
   9  * and return the more usual NULL pointer as logical address.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/export.h>
  14 #include <linux/errno.h>
  15 #include <linux/mm.h>
  16 #include <linux/memblock.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/gfp.h>
  19 #include <linux/dma-direct.h>
  20 #include <linux/dma-noncoherent.h>
  21 #include <asm/mipsregs.h>
  22 #include <asm/jazz.h>
  23 #include <asm/io.h>
  24 #include <linux/uaccess.h>
  25 #include <asm/dma.h>
  26 #include <asm/jazzdma.h>
  27 #include <asm/pgtable.h>
  28 
  29 /*
  30  * Set this to one to enable additional vdma debug code.
  31  */
  32 #define CONF_DEBUG_VDMA 0
  33 
  34 static VDMA_PGTBL_ENTRY *pgtbl;
  35 
  36 static DEFINE_SPINLOCK(vdma_lock);
  37 
  38 /*
  39  * Debug stuff
  40  */
  41 #define vdma_debug     ((CONF_DEBUG_VDMA) ? debuglvl : 0)
  42 
  43 static int debuglvl = 3;
  44 
  45 /*
  46  * Initialize the pagetable with a one-to-one mapping of
  47  * the first 16 Mbytes of main memory and declare all
  48  * entries to be unused. Using this method will at least
  49  * allow some early device driver operations to work.
  50  */
  51 static inline void vdma_pgtbl_init(void)
  52 {
  53         unsigned long paddr = 0;
  54         int i;
  55 
  56         for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
  57                 pgtbl[i].frame = paddr;
  58                 pgtbl[i].owner = VDMA_PAGE_EMPTY;
  59                 paddr += VDMA_PAGESIZE;
  60         }
  61 }
  62 
  63 /*
  64  * Initialize the Jazz R4030 dma controller
  65  */
  66 static int __init vdma_init(void)
  67 {
  68         /*
  69          * Allocate 32k of memory for DMA page tables.  This needs to be page
  70          * aligned and should be uncached to avoid cache flushing after every
  71          * update.
  72          */
  73         pgtbl = (VDMA_PGTBL_ENTRY *)__get_free_pages(GFP_KERNEL | GFP_DMA,
  74                                                     get_order(VDMA_PGTBL_SIZE));
  75         BUG_ON(!pgtbl);
  76         dma_cache_wback_inv((unsigned long)pgtbl, VDMA_PGTBL_SIZE);
  77         pgtbl = (VDMA_PGTBL_ENTRY *)CKSEG1ADDR((unsigned long)pgtbl);
  78 
  79         /*
  80          * Clear the R4030 translation table
  81          */
  82         vdma_pgtbl_init();
  83 
  84         r4030_write_reg32(JAZZ_R4030_TRSTBL_BASE,
  85                           CPHYSADDR((unsigned long)pgtbl));
  86         r4030_write_reg32(JAZZ_R4030_TRSTBL_LIM, VDMA_PGTBL_SIZE);
  87         r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
  88 
  89         printk(KERN_INFO "VDMA: R4030 DMA pagetables initialized.\n");
  90         return 0;
  91 }
  92 arch_initcall(vdma_init);
  93 
  94 /*
  95  * Allocate DMA pagetables using a simple first-fit algorithm
  96  */
  97 unsigned long vdma_alloc(unsigned long paddr, unsigned long size)
  98 {
  99         int first, last, pages, frame, i;
 100         unsigned long laddr, flags;
 101 
 102         /* check arguments */
 103 
 104         if (paddr > 0x1fffffff) {
 105                 if (vdma_debug)
 106                         printk("vdma_alloc: Invalid physical address: %08lx\n",
 107                                paddr);
 108                 return DMA_MAPPING_ERROR;       /* invalid physical address */
 109         }
 110         if (size > 0x400000 || size == 0) {
 111                 if (vdma_debug)
 112                         printk("vdma_alloc: Invalid size: %08lx\n", size);
 113                 return DMA_MAPPING_ERROR;       /* invalid physical address */
 114         }
 115 
 116         spin_lock_irqsave(&vdma_lock, flags);
 117         /*
 118          * Find free chunk
 119          */
 120         pages = VDMA_PAGE(paddr + size) - VDMA_PAGE(paddr) + 1;
 121         first = 0;
 122         while (1) {
 123                 while (pgtbl[first].owner != VDMA_PAGE_EMPTY &&
 124                        first < VDMA_PGTBL_ENTRIES) first++;
 125                 if (first + pages > VDMA_PGTBL_ENTRIES) {       /* nothing free */
 126                         spin_unlock_irqrestore(&vdma_lock, flags);
 127                         return DMA_MAPPING_ERROR;
 128                 }
 129 
 130                 last = first + 1;
 131                 while (pgtbl[last].owner == VDMA_PAGE_EMPTY
 132                        && last - first < pages)
 133                         last++;
 134 
 135                 if (last - first == pages)
 136                         break;  /* found */
 137                 first = last + 1;
 138         }
 139 
 140         /*
 141          * Mark pages as allocated
 142          */
 143         laddr = (first << 12) + (paddr & (VDMA_PAGESIZE - 1));
 144         frame = paddr & ~(VDMA_PAGESIZE - 1);
 145 
 146         for (i = first; i < last; i++) {
 147                 pgtbl[i].frame = frame;
 148                 pgtbl[i].owner = laddr;
 149                 frame += VDMA_PAGESIZE;
 150         }
 151 
 152         /*
 153          * Update translation table and return logical start address
 154          */
 155         r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
 156 
 157         if (vdma_debug > 1)
 158                 printk("vdma_alloc: Allocated %d pages starting from %08lx\n",
 159                      pages, laddr);
 160 
 161         if (vdma_debug > 2) {
 162                 printk("LADDR: ");
 163                 for (i = first; i < last; i++)
 164                         printk("%08x ", i << 12);
 165                 printk("\nPADDR: ");
 166                 for (i = first; i < last; i++)
 167                         printk("%08x ", pgtbl[i].frame);
 168                 printk("\nOWNER: ");
 169                 for (i = first; i < last; i++)
 170                         printk("%08x ", pgtbl[i].owner);
 171                 printk("\n");
 172         }
 173 
 174         spin_unlock_irqrestore(&vdma_lock, flags);
 175 
 176         return laddr;
 177 }
 178 
 179 EXPORT_SYMBOL(vdma_alloc);
 180 
 181 /*
 182  * Free previously allocated dma translation pages
 183  * Note that this does NOT change the translation table,
 184  * it just marks the free'd pages as unused!
 185  */
 186 int vdma_free(unsigned long laddr)
 187 {
 188         int i;
 189 
 190         i = laddr >> 12;
 191 
 192         if (pgtbl[i].owner != laddr) {
 193                 printk
 194                     ("vdma_free: trying to free other's dma pages, laddr=%8lx\n",
 195                      laddr);
 196                 return -1;
 197         }
 198 
 199         while (i < VDMA_PGTBL_ENTRIES && pgtbl[i].owner == laddr) {
 200                 pgtbl[i].owner = VDMA_PAGE_EMPTY;
 201                 i++;
 202         }
 203 
 204         if (vdma_debug > 1)
 205                 printk("vdma_free: freed %ld pages starting from %08lx\n",
 206                        i - (laddr >> 12), laddr);
 207 
 208         return 0;
 209 }
 210 
 211 EXPORT_SYMBOL(vdma_free);
 212 
 213 /*
 214  * Map certain page(s) to another physical address.
 215  * Caller must have allocated the page(s) before.
 216  */
 217 int vdma_remap(unsigned long laddr, unsigned long paddr, unsigned long size)
 218 {
 219         int first, pages;
 220 
 221         if (laddr > 0xffffff) {
 222                 if (vdma_debug)
 223                         printk
 224                             ("vdma_map: Invalid logical address: %08lx\n",
 225                              laddr);
 226                 return -EINVAL; /* invalid logical address */
 227         }
 228         if (paddr > 0x1fffffff) {
 229                 if (vdma_debug)
 230                         printk
 231                             ("vdma_map: Invalid physical address: %08lx\n",
 232                              paddr);
 233                 return -EINVAL; /* invalid physical address */
 234         }
 235 
 236         pages = (((paddr & (VDMA_PAGESIZE - 1)) + size) >> 12) + 1;
 237         first = laddr >> 12;
 238         if (vdma_debug)
 239                 printk("vdma_remap: first=%x, pages=%x\n", first, pages);
 240         if (first + pages > VDMA_PGTBL_ENTRIES) {
 241                 if (vdma_debug)
 242                         printk("vdma_alloc: Invalid size: %08lx\n", size);
 243                 return -EINVAL;
 244         }
 245 
 246         paddr &= ~(VDMA_PAGESIZE - 1);
 247         while (pages > 0 && first < VDMA_PGTBL_ENTRIES) {
 248                 if (pgtbl[first].owner != laddr) {
 249                         if (vdma_debug)
 250                                 printk("Trying to remap other's pages.\n");
 251                         return -EPERM;  /* not owner */
 252                 }
 253                 pgtbl[first].frame = paddr;
 254                 paddr += VDMA_PAGESIZE;
 255                 first++;
 256                 pages--;
 257         }
 258 
 259         /*
 260          * Update translation table
 261          */
 262         r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
 263 
 264         if (vdma_debug > 2) {
 265                 int i;
 266                 pages = (((paddr & (VDMA_PAGESIZE - 1)) + size) >> 12) + 1;
 267                 first = laddr >> 12;
 268                 printk("LADDR: ");
 269                 for (i = first; i < first + pages; i++)
 270                         printk("%08x ", i << 12);
 271                 printk("\nPADDR: ");
 272                 for (i = first; i < first + pages; i++)
 273                         printk("%08x ", pgtbl[i].frame);
 274                 printk("\nOWNER: ");
 275                 for (i = first; i < first + pages; i++)
 276                         printk("%08x ", pgtbl[i].owner);
 277                 printk("\n");
 278         }
 279 
 280         return 0;
 281 }
 282 
 283 /*
 284  * Translate a physical address to a logical address.
 285  * This will return the logical address of the first
 286  * match.
 287  */
 288 unsigned long vdma_phys2log(unsigned long paddr)
 289 {
 290         int i;
 291         int frame;
 292 
 293         frame = paddr & ~(VDMA_PAGESIZE - 1);
 294 
 295         for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
 296                 if (pgtbl[i].frame == frame)
 297                         break;
 298         }
 299 
 300         if (i == VDMA_PGTBL_ENTRIES)
 301                 return ~0UL;
 302 
 303         return (i << 12) + (paddr & (VDMA_PAGESIZE - 1));
 304 }
 305 
 306 EXPORT_SYMBOL(vdma_phys2log);
 307 
 308 /*
 309  * Translate a logical DMA address to a physical address
 310  */
 311 unsigned long vdma_log2phys(unsigned long laddr)
 312 {
 313         return pgtbl[laddr >> 12].frame + (laddr & (VDMA_PAGESIZE - 1));
 314 }
 315 
 316 EXPORT_SYMBOL(vdma_log2phys);
 317 
 318 /*
 319  * Print DMA statistics
 320  */
 321 void vdma_stats(void)
 322 {
 323         int i;
 324 
 325         printk("vdma_stats: CONFIG: %08x\n",
 326                r4030_read_reg32(JAZZ_R4030_CONFIG));
 327         printk("R4030 translation table base: %08x\n",
 328                r4030_read_reg32(JAZZ_R4030_TRSTBL_BASE));
 329         printk("R4030 translation table limit: %08x\n",
 330                r4030_read_reg32(JAZZ_R4030_TRSTBL_LIM));
 331         printk("vdma_stats: INV_ADDR: %08x\n",
 332                r4030_read_reg32(JAZZ_R4030_INV_ADDR));
 333         printk("vdma_stats: R_FAIL_ADDR: %08x\n",
 334                r4030_read_reg32(JAZZ_R4030_R_FAIL_ADDR));
 335         printk("vdma_stats: M_FAIL_ADDR: %08x\n",
 336                r4030_read_reg32(JAZZ_R4030_M_FAIL_ADDR));
 337         printk("vdma_stats: IRQ_SOURCE: %08x\n",
 338                r4030_read_reg32(JAZZ_R4030_IRQ_SOURCE));
 339         printk("vdma_stats: I386_ERROR: %08x\n",
 340                r4030_read_reg32(JAZZ_R4030_I386_ERROR));
 341         printk("vdma_chnl_modes:   ");
 342         for (i = 0; i < 8; i++)
 343                 printk("%04x ",
 344                        (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
 345                                                    (i << 5)));
 346         printk("\n");
 347         printk("vdma_chnl_enables: ");
 348         for (i = 0; i < 8; i++)
 349                 printk("%04x ",
 350                        (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
 351                                                    (i << 5)));
 352         printk("\n");
 353 }
 354 
 355 /*
 356  * DMA transfer functions
 357  */
 358 
 359 /*
 360  * Enable a DMA channel. Also clear any error conditions.
 361  */
 362 void vdma_enable(int channel)
 363 {
 364         int status;
 365 
 366         if (vdma_debug)
 367                 printk("vdma_enable: channel %d\n", channel);
 368 
 369         /*
 370          * Check error conditions first
 371          */
 372         status = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));
 373         if (status & 0x400)
 374                 printk("VDMA: Channel %d: Address error!\n", channel);
 375         if (status & 0x200)
 376                 printk("VDMA: Channel %d: Memory error!\n", channel);
 377 
 378         /*
 379          * Clear all interrupt flags
 380          */
 381         r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
 382                           r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
 383                                            (channel << 5)) | R4030_TC_INTR
 384                           | R4030_MEM_INTR | R4030_ADDR_INTR);
 385 
 386         /*
 387          * Enable the desired channel
 388          */
 389         r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
 390                           r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
 391                                            (channel << 5)) |
 392                           R4030_CHNL_ENABLE);
 393 }
 394 
 395 EXPORT_SYMBOL(vdma_enable);
 396 
 397 /*
 398  * Disable a DMA channel
 399  */
 400 void vdma_disable(int channel)
 401 {
 402         if (vdma_debug) {
 403                 int status =
 404                     r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
 405                                      (channel << 5));
 406 
 407                 printk("vdma_disable: channel %d\n", channel);
 408                 printk("VDMA: channel %d status: %04x (%s) mode: "
 409                        "%02x addr: %06x count: %06x\n",
 410                        channel, status,
 411                        ((status & 0x600) ? "ERROR" : "OK"),
 412                        (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
 413                                                    (channel << 5)),
 414                        (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ADDR +
 415                                                    (channel << 5)),
 416                        (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_COUNT +
 417                                                    (channel << 5)));
 418         }
 419 
 420         r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
 421                           r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
 422                                            (channel << 5)) &
 423                           ~R4030_CHNL_ENABLE);
 424 
 425         /*
 426          * After disabling a DMA channel a remote bus register should be
 427          * read to ensure that the current DMA acknowledge cycle is completed.
 428          */
 429         *((volatile unsigned int *) JAZZ_DUMMY_DEVICE);
 430 }
 431 
 432 EXPORT_SYMBOL(vdma_disable);
 433 
 434 /*
 435  * Set DMA mode. This function accepts the mode values used
 436  * to set a PC-style DMA controller. For the SCSI and FDC
 437  * channels, we also set the default modes each time we're
 438  * called.
 439  * NOTE: The FAST and BURST dma modes are supported by the
 440  * R4030 Rev. 2 and PICA chipsets only. I leave them disabled
 441  * for now.
 442  */
 443 void vdma_set_mode(int channel, int mode)
 444 {
 445         if (vdma_debug)
 446                 printk("vdma_set_mode: channel %d, mode 0x%x\n", channel,
 447                        mode);
 448 
 449         switch (channel) {
 450         case JAZZ_SCSI_DMA:     /* scsi */
 451                 r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
 452 /*                        R4030_MODE_FAST | */
 453 /*                        R4030_MODE_BURST | */
 454                                   R4030_MODE_INTR_EN |
 455                                   R4030_MODE_WIDTH_16 |
 456                                   R4030_MODE_ATIME_80);
 457                 break;
 458 
 459         case JAZZ_FLOPPY_DMA:   /* floppy */
 460                 r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
 461 /*                        R4030_MODE_FAST | */
 462 /*                        R4030_MODE_BURST | */
 463                                   R4030_MODE_INTR_EN |
 464                                   R4030_MODE_WIDTH_8 |
 465                                   R4030_MODE_ATIME_120);
 466                 break;
 467 
 468         case JAZZ_AUDIOL_DMA:
 469         case JAZZ_AUDIOR_DMA:
 470                 printk("VDMA: Audio DMA not supported yet.\n");
 471                 break;
 472 
 473         default:
 474                 printk
 475                     ("VDMA: vdma_set_mode() called with unsupported channel %d!\n",
 476                      channel);
 477         }
 478 
 479         switch (mode) {
 480         case DMA_MODE_READ:
 481                 r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
 482                                   r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
 483                                                    (channel << 5)) &
 484                                   ~R4030_CHNL_WRITE);
 485                 break;
 486 
 487         case DMA_MODE_WRITE:
 488                 r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
 489                                   r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
 490                                                    (channel << 5)) |
 491                                   R4030_CHNL_WRITE);
 492                 break;
 493 
 494         default:
 495                 printk
 496                     ("VDMA: vdma_set_mode() called with unknown dma mode 0x%x\n",
 497                      mode);
 498         }
 499 }
 500 
 501 EXPORT_SYMBOL(vdma_set_mode);
 502 
 503 /*
 504  * Set Transfer Address
 505  */
 506 void vdma_set_addr(int channel, long addr)
 507 {
 508         if (vdma_debug)
 509                 printk("vdma_set_addr: channel %d, addr %lx\n", channel,
 510                        addr);
 511 
 512         r4030_write_reg32(JAZZ_R4030_CHNL_ADDR + (channel << 5), addr);
 513 }
 514 
 515 EXPORT_SYMBOL(vdma_set_addr);
 516 
 517 /*
 518  * Set Transfer Count
 519  */
 520 void vdma_set_count(int channel, int count)
 521 {
 522         if (vdma_debug)
 523                 printk("vdma_set_count: channel %d, count %08x\n", channel,
 524                        (unsigned) count);
 525 
 526         r4030_write_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5), count);
 527 }
 528 
 529 EXPORT_SYMBOL(vdma_set_count);
 530 
 531 /*
 532  * Get Residual
 533  */
 534 int vdma_get_residue(int channel)
 535 {
 536         int residual;
 537 
 538         residual = r4030_read_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5));
 539 
 540         if (vdma_debug)
 541                 printk("vdma_get_residual: channel %d: residual=%d\n",
 542                        channel, residual);
 543 
 544         return residual;
 545 }
 546 
 547 /*
 548  * Get DMA channel enable register
 549  */
 550 int vdma_get_enable(int channel)
 551 {
 552         int enable;
 553 
 554         enable = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));
 555 
 556         if (vdma_debug)
 557                 printk("vdma_get_enable: channel %d: enable=%d\n", channel,
 558                        enable);
 559 
 560         return enable;
 561 }
 562 
 563 static void *jazz_dma_alloc(struct device *dev, size_t size,
 564                 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 565 {
 566         void *ret;
 567 
 568         ret = dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs);
 569         if (!ret)
 570                 return NULL;
 571 
 572         *dma_handle = vdma_alloc(virt_to_phys(ret), size);
 573         if (*dma_handle == DMA_MAPPING_ERROR) {
 574                 dma_direct_free_pages(dev, size, ret, *dma_handle, attrs);
 575                 return NULL;
 576         }
 577 
 578         return ret;
 579 }
 580 
 581 static void jazz_dma_free(struct device *dev, size_t size, void *vaddr,
 582                 dma_addr_t dma_handle, unsigned long attrs)
 583 {
 584         vdma_free(dma_handle);
 585         dma_direct_free_pages(dev, size, vaddr, dma_handle, attrs);
 586 }
 587 
 588 static dma_addr_t jazz_dma_map_page(struct device *dev, struct page *page,
 589                 unsigned long offset, size_t size, enum dma_data_direction dir,
 590                 unsigned long attrs)
 591 {
 592         phys_addr_t phys = page_to_phys(page) + offset;
 593 
 594         if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
 595                 arch_sync_dma_for_device(dev, phys, size, dir);
 596         return vdma_alloc(phys, size);
 597 }
 598 
 599 static void jazz_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
 600                 size_t size, enum dma_data_direction dir, unsigned long attrs)
 601 {
 602         if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
 603                 arch_sync_dma_for_cpu(dev, vdma_log2phys(dma_addr), size, dir);
 604         vdma_free(dma_addr);
 605 }
 606 
 607 static int jazz_dma_map_sg(struct device *dev, struct scatterlist *sglist,
 608                 int nents, enum dma_data_direction dir, unsigned long attrs)
 609 {
 610         int i;
 611         struct scatterlist *sg;
 612 
 613         for_each_sg(sglist, sg, nents, i) {
 614                 if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
 615                         arch_sync_dma_for_device(dev, sg_phys(sg), sg->length,
 616                                 dir);
 617                 sg->dma_address = vdma_alloc(sg_phys(sg), sg->length);
 618                 if (sg->dma_address == DMA_MAPPING_ERROR)
 619                         return 0;
 620                 sg_dma_len(sg) = sg->length;
 621         }
 622 
 623         return nents;
 624 }
 625 
 626 static void jazz_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
 627                 int nents, enum dma_data_direction dir, unsigned long attrs)
 628 {
 629         int i;
 630         struct scatterlist *sg;
 631 
 632         for_each_sg(sglist, sg, nents, i) {
 633                 if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
 634                         arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length,
 635                                 dir);
 636                 vdma_free(sg->dma_address);
 637         }
 638 }
 639 
 640 static void jazz_dma_sync_single_for_device(struct device *dev,
 641                 dma_addr_t addr, size_t size, enum dma_data_direction dir)
 642 {
 643         arch_sync_dma_for_device(dev, vdma_log2phys(addr), size, dir);
 644 }
 645 
 646 static void jazz_dma_sync_single_for_cpu(struct device *dev,
 647                 dma_addr_t addr, size_t size, enum dma_data_direction dir)
 648 {
 649         arch_sync_dma_for_cpu(dev, vdma_log2phys(addr), size, dir);
 650 }
 651 
 652 static void jazz_dma_sync_sg_for_device(struct device *dev,
 653                 struct scatterlist *sgl, int nents, enum dma_data_direction dir)
 654 {
 655         struct scatterlist *sg;
 656         int i;
 657 
 658         for_each_sg(sgl, sg, nents, i)
 659                 arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir);
 660 }
 661 
 662 static void jazz_dma_sync_sg_for_cpu(struct device *dev,
 663                 struct scatterlist *sgl, int nents, enum dma_data_direction dir)
 664 {
 665         struct scatterlist *sg;
 666         int i;
 667 
 668         for_each_sg(sgl, sg, nents, i)
 669                 arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
 670 }
 671 
 672 const struct dma_map_ops jazz_dma_ops = {
 673         .alloc                  = jazz_dma_alloc,
 674         .free                   = jazz_dma_free,
 675         .map_page               = jazz_dma_map_page,
 676         .unmap_page             = jazz_dma_unmap_page,
 677         .map_sg                 = jazz_dma_map_sg,
 678         .unmap_sg               = jazz_dma_unmap_sg,
 679         .sync_single_for_cpu    = jazz_dma_sync_single_for_cpu,
 680         .sync_single_for_device = jazz_dma_sync_single_for_device,
 681         .sync_sg_for_cpu        = jazz_dma_sync_sg_for_cpu,
 682         .sync_sg_for_device     = jazz_dma_sync_sg_for_device,
 683         .dma_supported          = dma_direct_supported,
 684         .cache_sync             = arch_dma_cache_sync,
 685         .mmap                   = dma_common_mmap,
 686         .get_sgtable            = dma_common_get_sgtable,
 687 };
 688 EXPORT_SYMBOL(jazz_dma_ops);
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root/arch/mips/jazz/jazzdma.c

DEFINITIONS
