Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 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 | |
Christoph Hellwig | 9f4df96b | 2020-09-22 15:36:11 +0200 | [diff] [blame] | 9 | #include <linux/dma-map-ops.h> |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 10 | #include <linux/device.h> |
| 11 | #include <linux/kernel.h> |
Finn Thain | b12c8a70 | 2018-05-17 20:07:13 +1000 | [diff] [blame] | 12 | #include <linux/platform_device.h> |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 13 | #include <linux/scatterlist.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/vmalloc.h> |
| 16 | #include <linux/export.h> |
| 17 | |
Mike Rapoport | ca15ca4 | 2020-08-06 23:22:28 -0700 | [diff] [blame] | 18 | #include <asm/cacheflush.h> |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 19 | |
Greg Ungerer | b60f187 | 2012-06-26 21:02:54 +1000 | [diff] [blame] | 20 | #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) |
Christoph Hellwig | 69878ef | 2019-06-25 11:01:35 +0200 | [diff] [blame] | 21 | void arch_dma_prep_coherent(struct page *page, size_t size) |
| 22 | { |
| 23 | cache_push(page_to_phys(page), size); |
| 24 | } |
| 25 | |
Christoph Hellwig | 419e2f1 | 2019-08-26 09:03:44 +0200 | [diff] [blame] | 26 | pgprot_t pgprot_dmacoherent(pgprot_t prot) |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 27 | { |
Christoph Hellwig | 34dc63a | 2019-06-25 11:01:34 +0200 | [diff] [blame] | 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; |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 33 | } |
Christoph Hellwig | 34dc63a | 2019-06-25 11:01:34 +0200 | [diff] [blame] | 34 | return prot; |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 35 | } |
Greg Ungerer | 66d857b | 2011-03-22 13:39:27 +1000 | [diff] [blame] | 36 | #else |
Christoph Hellwig | 9eb8be6 | 2018-06-20 10:19:45 +0200 | [diff] [blame] | 37 | void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, |
| 38 | gfp_t gfp, unsigned long attrs) |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 39 | { |
| 40 | void *ret; |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 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 | |
Christoph Hellwig | 9eb8be6 | 2018-06-20 10:19:45 +0200 | [diff] [blame] | 53 | void arch_dma_free(struct device *dev, size_t size, void *vaddr, |
Krzysztof Kozlowski | 00085f1 | 2016-08-03 13:46:00 -0700 | [diff] [blame] | 54 | dma_addr_t dma_handle, unsigned long attrs) |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 55 | { |
| 56 | free_pages((unsigned long)vaddr, get_order(size)); |
| 57 | } |
| 58 | |
Greg Ungerer | b60f187 | 2012-06-26 21:02:54 +1000 | [diff] [blame] | 59 | #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */ |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 60 | |
Christoph Hellwig | 56e35f9 | 2019-11-07 18:03:11 +0100 | [diff] [blame] | 61 | void arch_sync_dma_for_device(phys_addr_t handle, size_t size, |
| 62 | enum dma_data_direction dir) |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 63 | { |
| 64 | switch (dir) { |
Greg Ungerer | d2661c6 | 2012-07-10 13:50:58 +1000 | [diff] [blame] | 65 | case DMA_BIDIRECTIONAL: |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 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: |
Geert Uytterhoeven | 7c79e1e | 2016-12-06 19:57:37 +0100 | [diff] [blame] | 73 | pr_err_ratelimited("dma_sync_single_for_device: unsupported dir %u\n", |
| 74 | dir); |
Greg Ungerer | 5641686 | 2012-05-02 17:06:22 +1000 | [diff] [blame] | 75 | break; |
| 76 | } |
| 77 | } |