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-map-ops.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/cacheflush.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 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, 38 gfp_t gfp, unsigned long attrs) 39 { 40 void *ret; 41 42 if (dev == NULL || (*dev->dma_mask < 0xffffffff)) 43 gfp |= GFP_DMA; 44 ret = (void *)__get_free_pages(gfp, get_order(size)); 45 46 if (ret != NULL) { 47 memset(ret, 0, size); 48 *dma_handle = virt_to_phys(ret); 49 } 50 return ret; 51 } 52 53 void arch_dma_free(struct device *dev, size_t size, void *vaddr, 54 dma_addr_t dma_handle, unsigned long attrs) 55 { 56 free_pages((unsigned long)vaddr, get_order(size)); 57 } 58 59 #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */ 60 61 void arch_sync_dma_for_device(phys_addr_t handle, size_t size, 62 enum dma_data_direction dir) 63 { 64 switch (dir) { 65 case DMA_BIDIRECTIONAL: 66 case DMA_TO_DEVICE: 67 cache_push(handle, size); 68 break; 69 case DMA_FROM_DEVICE: 70 cache_clear(handle, size); 71 break; 72 default: 73 pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n", 74 dir); 75 break; 76 } 77 } 78