arch/sh/boards/harp/pcidma.c

   1 /*
   2  * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
   3  *
   4  * May be copied or modified under the terms of the GNU General Public
   5  * License.  See linux/COPYING for more information.
   6  *
   7  * Dynamic DMA mapping support.
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/mm.h>
  12 #include <linux/string.h>
  13 #include <linux/pci.h>
  14 #include <asm/io.h>
  15 #include <asm/addrspace.h>
  16
  17
  18 void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
  19                            dma_addr_t * dma_handle)
  20 {
  21         void *ret;
  22         int gfp = GFP_ATOMIC;
  23
  24         ret = (void *) __get_free_pages(gfp, get_order(size));
  25
  26         if (ret != NULL) {
  27                 /* Is it neccessary to do the memset? */
  28                 memset(ret, 0, size);
  29                 *dma_handle = virt_to_bus(ret);
  30         }
  31         /* We must flush the cache before we pass it on to the device */
  32         flush_cache_all();
  33         return  P2SEGADDR(ret);
  34 }
  35
  36 void pci_free_consistent(struct pci_dev *hwdev, size_t size,
  37                          void *vaddr, dma_addr_t dma_handle)
  38 {
  39         unsigned long p1addr=P1SEGADDR((unsigned long)vaddr);
  40
  41         free_pages(p1addr, get_order(size));
  42 }