sys/dev/drm/include/asm/pci-dma-compat.h

   1 /*
   2  * Copyright (c) 2015 François Tigeot
   3  * Copyright (c) 2015 Matthew Dillon <dillon@backplane.com>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice unmodified, this list of conditions, and the following
  11  *    disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #ifndef _ASM_PCI_DMA_COMPAT_H_
  29 #define _ASM_PCI_DMA_COMPAT_H_
  30
  31 #include <vm/vm_page.h>
  32
  33 static inline dma_addr_t
  34 pci_map_page(struct pci_dev *hwdev, struct vm_page *page,
  35              unsigned long offset, size_t size, int direction)
  36 {
  37         return VM_PAGE_TO_PHYS(page) + offset;
  38 }
  39
  40 static inline void
  41 pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
  42                size_t size, int direction)
  43 {
  44 }
  45
  46 static inline int
  47 pci_dma_mapping_error(struct pci_dev *hwdev, dma_addr_t dma_address)
  48 {
  49         return (dma_address == 0);
  50 }
  51
  52 #endif  /* _ASM_PCI_DMA_COMPAT_H_ */