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/highmem.h>
  17 #include <linux/scatterlist.h>
  18 #include <asm/io.h>
  19
  20 void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
  21 {
  22         void *ret;
  23
  24         ret = consistent_alloc(gfp, size, dma_handle);
  25         if (ret)
  26                 memset(ret, 0, size);
  27
  28         return ret;
  29 }
  30
  31 EXPORT_SYMBOL(dma_alloc_coherent);
  32
  33 void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
  34 {
  35         consistent_free(vaddr);
  36 }
  37
  38 EXPORT_SYMBOL(dma_free_coherent);
  39
  40 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
  41                           enum dma_data_direction direction)
  42 {
  43         BUG_ON(direction == DMA_NONE);
  44
  45         frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
  46
  47         return virt_to_bus(ptr);
  48 }
  49
  50 EXPORT_SYMBOL(dma_map_single);
  51
  52 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  53                enum dma_data_direction direction)
  54 {
  55         unsigned long dampr2;
  56         void *vaddr;
  57         int i;
  58
  59         BUG_ON(direction == DMA_NONE);
  60
  61         dampr2 = __get_DAMPR(2);
  62
  63         for (i = 0; i < nents; i++) {
  64                 vaddr = kmap_atomic(sg_page(&sg[i]), __KM_CACHE);
  65
  66                 frv_dcache_writeback((unsigned long) vaddr,
  67                                      (unsigned long) vaddr + PAGE_SIZE);
  68
  69         }
  70
  71         kunmap_atomic(vaddr, __KM_CACHE);
  72         if (dampr2) {
  73                 __set_DAMPR(2, dampr2);
  74                 __set_IAMPR(2, dampr2);
  75         }
  76
  77         return nents;
  78 }
  79
  80 EXPORT_SYMBOL(dma_map_sg);
  81
  82 dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  83                         size_t size, enum dma_data_direction direction)
  84 {
  85         BUG_ON(direction == DMA_NONE);
  86         flush_dcache_page(page);
  87         return (dma_addr_t) page_to_phys(page) + offset;
  88 }
  89
  90 EXPORT_SYMBOL(dma_map_page);