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
  21 void *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
  32 EXPORT_SYMBOL(dma_alloc_coherent);
  33
  34 void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
  35 {
  36         consistent_free(vaddr);
  37 }
  38
  39 EXPORT_SYMBOL(dma_free_coherent);
  40
  41 dma_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
  51 EXPORT_SYMBOL(dma_map_single);
  52
  53 int 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
  81 EXPORT_SYMBOL(dma_map_sg);
  82
  83 dma_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
  91 EXPORT_SYMBOL(dma_map_page);