diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/kernel/dma.c')
-rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/kernel/dma.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/dma.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/dma.c new file mode 100644 index 0000000000..f61810532a --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/kernel/dma.c @@ -0,0 +1,60 @@ +/* + * arch/ubicom32/kernel/dma.c + * Ubicom32 architecture dynamic DMA mapping support. + * + * (C) Copyright 2009, Ubicom, Inc. + * + * This file is part of the Ubicom32 Linux Kernel Port. + * + * The Ubicom32 Linux Kernel Port is free software: you can redistribute + * it and/or modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, either version 2 of the + * License, or (at your option) any later version. + * + * The Ubicom32 Linux Kernel Port is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; without even the implied + * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with the Ubicom32 Linux Kernel Port. If not, + * see <http://www.gnu.org/licenses/>. + * + * Ubicom32 implementation derived from (with many thanks): + * arch/m68knommu + * arch/blackfin + * arch/parisc + * + * We never have any address translations to worry about, so this + * is just alloc/free. + */ + +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/device.h> +#include <linux/io.h> + +void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, int gfp) +{ + void *ret; + /* ignore region specifiers */ + gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); + + if (dev == NULL || (*dev->dma_mask < 0xffffffff)) + gfp |= GFP_DMA; + ret = (void *)__get_free_pages(gfp, get_order(size)); + + if (ret != NULL) { + memset(ret, 0, size); + *dma_handle = virt_to_phys(ret); + } + return ret; +} + +void dma_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + free_pages((unsigned long)vaddr, get_order(size)); +} |