049aa166b1
The consistent DMA stuff was evolved from the old PCI DMA mapping functions. As this has been overhauled, it's something that is used by the generic DMA mapping code, and thus, has no intrinsic PCI dependence. Move the routines somewhere more sensible (same place as sh), and fix up the build for CONFIG_PCI=n in the process. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/*
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* Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
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* Copyright (C) 2003 Paul Mundt (lethal@linux-sh.org)
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* Dynamic DMA mapping support.
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <asm/io.h>
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void *consistent_alloc(struct pci_dev *hwdev, size_t size,
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dma_addr_t *dma_handle)
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{
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void *ret;
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int gfp = GFP_ATOMIC;
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void *vp;
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if (hwdev == NULL || hwdev->dma_mask != 0xffffffff)
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gfp |= GFP_DMA;
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ret = (void *)__get_free_pages(gfp, get_order(size));
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/* now call our friend ioremap_nocache to give us an uncached area */
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vp = ioremap_nocache(virt_to_phys(ret), size);
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if (vp != NULL) {
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memset(vp, 0, size);
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*dma_handle = virt_to_phys(ret);
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dma_cache_wback_inv((unsigned long)ret, size);
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}
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return vp;
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}
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EXPORT_SYMBOL(consistent_alloc);
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void consistent_free(struct pci_dev *hwdev, size_t size,
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void *vaddr, dma_addr_t dma_handle)
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{
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void *alloc;
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alloc = phys_to_virt((unsigned long)dma_handle);
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free_pages((unsigned long)alloc, get_order(size));
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iounmap(vaddr);
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}
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EXPORT_SYMBOL(consistent_free);
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