LXR linux-old/arch/sh/stboards/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
  18void *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
  36void 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}
  43