arch/ppc/kernel/pci-dma.c

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