arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / sh / kernel / dma-coherent.c
blobd4811691b93cc170c8d4c3b39f29c84401e6ccac
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2004 - 2007 Paul Mundt
4 */
5 #include <linux/mm.h>
6 #include <linux/init.h>
7 #include <linux/dma-noncoherent.h>
8 #include <linux/module.h>
9 #include <asm/cacheflush.h>
10 #include <asm/addrspace.h>
12 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
13 gfp_t gfp, unsigned long attrs)
15 void *ret, *ret_nocache;
16 int order = get_order(size);
18 gfp |= __GFP_ZERO;
20 ret = (void *)__get_free_pages(gfp, order);
21 if (!ret)
22 return NULL;
25 * Pages from the page allocator may have data present in
26 * cache. So flush the cache before using uncached memory.
28 arch_sync_dma_for_device(virt_to_phys(ret), size,
29 DMA_BIDIRECTIONAL);
31 ret_nocache = (void __force *)ioremap(virt_to_phys(ret), size);
32 if (!ret_nocache) {
33 free_pages((unsigned long)ret, order);
34 return NULL;
37 split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
39 *dma_handle = virt_to_phys(ret);
40 if (!WARN_ON(!dev))
41 *dma_handle -= PFN_PHYS(dev->dma_pfn_offset);
43 return ret_nocache;
46 void arch_dma_free(struct device *dev, size_t size, void *vaddr,
47 dma_addr_t dma_handle, unsigned long attrs)
49 int order = get_order(size);
50 unsigned long pfn = (dma_handle >> PAGE_SHIFT);
51 int k;
53 if (!WARN_ON(!dev))
54 pfn += dev->dma_pfn_offset;
56 for (k = 0; k < (1 << order); k++)
57 __free_pages(pfn_to_page(pfn + k), 0);
59 iounmap(vaddr);
62 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
63 enum dma_data_direction dir)
65 void *addr = sh_cacheop_vaddr(phys_to_virt(paddr));
67 switch (dir) {
68 case DMA_FROM_DEVICE: /* invalidate only */
69 __flush_invalidate_region(addr, size);
70 break;
71 case DMA_TO_DEVICE: /* writeback only */
72 __flush_wback_region(addr, size);
73 break;
74 case DMA_BIDIRECTIONAL: /* writeback and invalidate */
75 __flush_purge_region(addr, size);
76 break;
77 default:
78 BUG();