LXR linux/arch/frv/mb93090-mb00/pci-dma.c

   1/* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs
   2 *
   3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4 * Written by David Howells (dhowells@redhat.com)
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#include <linux/types.h>
  13#include <linux/dma-mapping.h>
  14#include <linux/list.h>
  15#include <linux/pci.h>
  16#include <linux/export.h>
  17#include <linux/highmem.h>
  18#include <linux/scatterlist.h>
  19#include <asm/io.h>
  20
  21void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
  22{
  23        void *ret;
  24
  25        ret = consistent_alloc(gfp, size, dma_handle);
  26        if (ret)
  27                memset(ret, 0, size);
  28
  29        return ret;
  30}
  31
  32EXPORT_SYMBOL(dma_alloc_coherent);
  33
  34void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
  35{
  36        consistent_free(vaddr);
  37}
  38
  39EXPORT_SYMBOL(dma_free_coherent);
  40
  41dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
  42                          enum dma_data_direction direction)
  43{
  44        BUG_ON(direction == DMA_NONE);
  45
  46        frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
  47
  48        return virt_to_bus(ptr);
  49}
  50
  51EXPORT_SYMBOL(dma_map_single);
  52
  53int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  54               enum dma_data_direction direction)
  55{
  56        unsigned long dampr2;
  57        void *vaddr;
  58        int i;
  59
  60        BUG_ON(direction == DMA_NONE);
  61
  62        dampr2 = __get_DAMPR(2);
  63
  64        for (i = 0; i < nents; i++) {
  65                vaddr = kmap_atomic_primary(sg_page(&sg[i]));
  66
  67                frv_dcache_writeback((unsigned long) vaddr,
  68                                     (unsigned long) vaddr + PAGE_SIZE);
  69
  70        }
  71
  72        kunmap_atomic_primary(vaddr);
  73        if (dampr2) {
  74                __set_DAMPR(2, dampr2);
  75                __set_IAMPR(2, dampr2);
  76        }
  77
  78        return nents;
  79}
  80
  81EXPORT_SYMBOL(dma_map_sg);
  82
  83dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  84                        size_t size, enum dma_data_direction direction)
  85{
  86        BUG_ON(direction == DMA_NONE);
  87        flush_dcache_page(page);
  88        return (dma_addr_t) page_to_phys(page) + offset;
  89}
  90
  91EXPORT_SYMBOL(dma_map_page);
  92