release/src-rt-6.x/linux/linux-2.6/arch/mips/pci/pci-dac.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2000  Ani Joshi <ajoshi@unixbox.com>
   7  * Copyright (C) 2000, 2001, 06  Ralf Baechle <ralf@linux-mips.org>
   8  * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/mm.h>
  14 #include <linux/module.h>
  15 #include <linux/string.h>
  16
  17 #include <asm/cache.h>
  18 #include <asm/io.h>
  19
  20 #include <dma-coherence.h>
  21
  22 #include <linux/pci.h>
  23
  24 dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
  25         struct page *page, unsigned long offset, int direction)
  26 {
  27         struct device *dev = &pdev->dev;
  28
  29         BUG_ON(direction == DMA_NONE);
  30
  31         if (!plat_device_is_coherent(dev)) {
  32                 unsigned long addr;
  33
  34                 addr = (unsigned long) page_address(page) + offset;
  35                 dma_cache_wback_inv(addr, PAGE_SIZE);
  36         }
  37
  38         return plat_map_dma_mem_page(dev, page) + offset;
  39 }
  40
  41 EXPORT_SYMBOL(pci_dac_page_to_dma);
  42
  43 struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
  44         dma64_addr_t dma_addr)
  45 {
  46         return pfn_to_page(plat_dma_addr_to_phys(dma_addr) >> PAGE_SHIFT);
  47 }
  48
  49 EXPORT_SYMBOL(pci_dac_dma_to_page);
  50
  51 unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
  52         dma64_addr_t dma_addr)
  53 {
  54         return dma_addr & ~PAGE_MASK;
  55 }
  56
  57 EXPORT_SYMBOL(pci_dac_dma_to_offset);
  58
  59 void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
  60         dma64_addr_t dma_addr, size_t len, int direction)
  61 {
  62         BUG_ON(direction == PCI_DMA_NONE);
  63
  64         if (!plat_device_is_coherent(&pdev->dev))
  65                 dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
  66 }
  67
  68 EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu);
  69
  70 void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
  71         dma64_addr_t dma_addr, size_t len, int direction)
  72 {
  73         BUG_ON(direction == PCI_DMA_NONE);
  74
  75         if (!plat_device_is_coherent(&pdev->dev))
  76                 dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
  77 }
  78
  79 EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device);