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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [sh64/] [mm/] [consistent.c] - Rev 17
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/* * Copyright (C) 2001 David J. Mckay (david.mckay@st.com) * Copyright (C) 2003 Paul Mundt (lethal@linux-sh.org) * * May be copied or modified under the terms of the GNU General Public * License. See linux/COPYING for more information. * * Dynamic DMA mapping support. */ #include <linux/types.h> #include <linux/mm.h> #include <linux/string.h> #include <linux/pci.h> #include <linux/dma-mapping.h> #include <linux/module.h> #include <asm/io.h> void *consistent_alloc(struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle) { void *ret; int gfp = GFP_ATOMIC; void *vp; if (hwdev == NULL || hwdev->dma_mask != 0xffffffff) gfp |= GFP_DMA; ret = (void *)__get_free_pages(gfp, get_order(size)); /* now call our friend ioremap_nocache to give us an uncached area */ vp = ioremap_nocache(virt_to_phys(ret), size); if (vp != NULL) { memset(vp, 0, size); *dma_handle = virt_to_phys(ret); dma_cache_sync(NULL, ret, size, DMA_BIDIRECTIONAL); } return vp; } EXPORT_SYMBOL(consistent_alloc); void consistent_free(struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle) { void *alloc; alloc = phys_to_virt((unsigned long)dma_handle); free_pages((unsigned long)alloc, get_order(size)); iounmap(vaddr); } EXPORT_SYMBOL(consistent_free);
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