arch/ppc/kernel/pci-dma.c

   1 /*
   2  * BK Id: SCCS/s.pci-dma.c 1.10 06/13/02 14:57:36 trini
   3  */
   4 /*
   5  * Copyright (C) 2000   Ani Joshi <ajoshi@unixbox.com>
   6  *
   7  *
   8  * Dynamic DMA mapping support.
   9  *
  10  * swiped from i386
  11  *
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/mm.h>
  16 #include <linux/string.h>
  17 #include <linux/pci.h>
  18 #include <asm/io.h>
  19
  20 void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
  21                            dma_addr_t *dma_handle)
  22 {
  23         void *ret;
  24         int gfp = GFP_ATOMIC;
  25
  26         if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
  27                 gfp |= GFP_DMA;
  28
  29 #ifdef CONFIG_NOT_COHERENT_CACHE
  30         ret = consistent_alloc(gfp, size, dma_handle);
  31 #else
  32         ret = (void *)__get_free_pages(gfp, get_order(size));
  33 #endif
  34
  35         if (ret != NULL) {
  36                 memset(ret, 0, size);
  37 #ifndef CONFIG_NOT_COHERENT_CACHE
  38                 *dma_handle = virt_to_bus(ret);
  39 #endif
  40         }
  41         return ret;
  42 }
  43
  44 void pci_free_consistent(struct pci_dev *hwdev, size_t size,
  45                          void *vaddr, dma_addr_t dma_handle)
  46 {
  47 #ifdef CONFIG_NOT_COHERENT_CACHE
  48         consistent_free(vaddr);
  49 #else
  50         free_pages((unsigned long)vaddr, get_order(size));
  51 #endif
  52 }