1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file COPYING in the main directory of this archive 4 * for more details. 5 */ 6 7 #undef DEBUG 8 9 #include <linux/dma-noncoherent.h> 10 #include <linux/device.h> 11 #include <linux/kernel.h> 12 #include <linux/platform_device.h> 13 #include <linux/scatterlist.h> 14 #include <linux/slab.h> 15 #include <linux/vmalloc.h> 16 #include <linux/export.h> 17 18 #include <asm/pgalloc.h> 19 20 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) 21 void arch_dma_prep_coherent(struct page *page, size_t size) 22 { 23 cache_push(page_to_phys(page), size); 24 } 25 26 pgprot_t pgprot_dmacoherent(pgprot_t prot) 27 { 28 if (CPU_IS_040_OR_060) { 29 pgprot_val(prot) &= ~_PAGE_CACHE040; 30 pgprot_val(prot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S; 31 } else { 32 pgprot_val(prot) |= _PAGE_NOCACHE030; 33 } 34 return prot; 35 } 36 #else 37 38 #include <asm/cacheflush.h> 39 40 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, 41 gfp_t gfp, unsigned long attrs) 42 { 43 void *ret; 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 arch_dma_free(struct device *dev, size_t size, void *vaddr, 57 dma_addr_t dma_handle, unsigned long attrs) 58 { 59 free_pages((unsigned long)vaddr, get_order(size)); 60 } 61 62 #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */ 63 64 void arch_sync_dma_for_device(phys_addr_t handle, size_t size, 65 enum dma_data_direction dir) 66 { 67 switch (dir) { 68 case DMA_BIDIRECTIONAL: 69 case DMA_TO_DEVICE: 70 cache_push(handle, size); 71 break; 72 case DMA_FROM_DEVICE: 73 cache_clear(handle, size); 74 break; 75 default: 76 pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n", 77 dir); 78 break; 79 } 80 } 81