1 // SPDX-License-Identifier: GPL-2.0 <<
2 /* 1 /*
3 * Copyright (C) 2009-2010 PetaLogix !! 2 * This file is subject to the terms and conditions of the GNU General Public
4 * Copyright (C) 2006 Benjamin Herrenschmidt, !! 3 * License. See the file COPYING in the main directory of this archive
5 * !! 4 * for more details.
6 * Provide default implementations of the DMA <<
7 * directly mapped busses. <<
8 */ 5 */
9 6
10 #include <linux/device.h> <<
11 #include <linux/dma-map-ops.h> 7 #include <linux/dma-map-ops.h>
12 #include <linux/gfp.h> !! 8 #include <linux/kernel.h>
13 #include <linux/export.h> <<
14 #include <linux/bug.h> <<
15 #include <asm/cacheflush.h> 9 #include <asm/cacheflush.h>
16 10
17 static void __dma_sync(phys_addr_t paddr, size !! 11 #ifndef CONFIG_COLDFIRE
18 enum dma_data_direction direct !! 12 void arch_dma_prep_coherent(struct page *page, size_t size)
19 { 13 {
20 switch (direction) { !! 14 cache_push(page_to_phys(page), size);
21 case DMA_TO_DEVICE: <<
22 case DMA_BIDIRECTIONAL: <<
23 flush_dcache_range(paddr, padd <<
24 break; <<
25 case DMA_FROM_DEVICE: <<
26 invalidate_dcache_range(paddr, <<
27 break; <<
28 default: <<
29 BUG(); <<
30 } <<
31 } 15 }
32 16
33 void arch_sync_dma_for_device(phys_addr_t padd !! 17 pgprot_t pgprot_dmacoherent(pgprot_t prot)
34 enum dma_data_direction dir) <<
35 { 18 {
36 __dma_sync(paddr, size, dir); !! 19 if (CPU_IS_040_OR_060) {
>> 20 pgprot_val(prot) &= ~_PAGE_CACHE040;
>> 21 pgprot_val(prot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
>> 22 } else {
>> 23 pgprot_val(prot) |= _PAGE_NOCACHE030;
>> 24 }
>> 25 return prot;
37 } 26 }
>> 27 #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
38 28
39 void arch_sync_dma_for_cpu(phys_addr_t paddr, !! 29 void arch_sync_dma_for_device(phys_addr_t handle, size_t size,
40 enum dma_data_direction dir) 30 enum dma_data_direction dir)
41 { 31 {
42 __dma_sync(paddr, size, dir); !! 32 switch (dir) {
>> 33 case DMA_BIDIRECTIONAL:
>> 34 case DMA_TO_DEVICE:
>> 35 cache_push(handle, size);
>> 36 break;
>> 37 case DMA_FROM_DEVICE:
>> 38 cache_clear(handle, size);
>> 39 break;
>> 40 default:
>> 41 pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n",
>> 42 dir);
>> 43 break;
>> 44 }
43 } 45 }
44 46
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