| 1 | /* |
| 2 | * arch/ubicom32/kernel/dma.c |
| 3 | * Ubicom32 architecture dynamic DMA mapping support. |
| 4 | * |
| 5 | * (C) Copyright 2009, Ubicom, Inc. |
| 6 | * |
| 7 | * This file is part of the Ubicom32 Linux Kernel Port. |
| 8 | * |
| 9 | * The Ubicom32 Linux Kernel Port is free software: you can redistribute |
| 10 | * it and/or modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation, either version 2 of the |
| 12 | * License, or (at your option) any later version. |
| 13 | * |
| 14 | * The Ubicom32 Linux Kernel Port is distributed in the hope that it |
| 15 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 16 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 17 | * the GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with the Ubicom32 Linux Kernel Port. If not, |
| 21 | * see <http://www.gnu.org/licenses/>. |
| 22 | * |
| 23 | * Ubicom32 implementation derived from (with many thanks): |
| 24 | * arch/m68knommu |
| 25 | * arch/blackfin |
| 26 | * arch/parisc |
| 27 | * |
| 28 | * We never have any address translations to worry about, so this |
| 29 | * is just alloc/free. |
| 30 | */ |
| 31 | |
| 32 | #include <linux/types.h> |
| 33 | #include <linux/mm.h> |
| 34 | #include <linux/string.h> |
| 35 | #include <linux/device.h> |
| 36 | #include <linux/io.h> |
| 37 | |
| 38 | void *dma_alloc_coherent(struct device *dev, size_t size, |
| 39 | dma_addr_t *dma_handle, int gfp) |
| 40 | { |
| 41 | void *ret; |
| 42 | /* ignore region specifiers */ |
| 43 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); |
| 44 | |
| 45 | if (dev == NULL || (*dev->dma_mask < 0xffffffff)) |
| 46 | gfp |= GFP_DMA; |
| 47 | ret = (void *)__get_free_pages(gfp, get_order(size)); |
| 48 | |
| 49 | if (ret != NULL) { |
| 50 | memset(ret, 0, size); |
| 51 | *dma_handle = virt_to_phys(ret); |
| 52 | } |
| 53 | return ret; |
| 54 | } |
| 55 | |
| 56 | void dma_free_coherent(struct device *dev, size_t size, |
| 57 | void *vaddr, dma_addr_t dma_handle) |
| 58 | { |
| 59 | free_pages((unsigned long)vaddr, get_order(size)); |
| 60 | } |
| 61 | |
