diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sh/mm/consistent.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/sh/mm/consistent.c')
-rw-r--r-- | arch/sh/mm/consistent.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c new file mode 100644 index 000000000000..1f7af0c73cf4 --- /dev/null +++ b/arch/sh/mm/consistent.c @@ -0,0 +1,85 @@ +/* + * arch/sh/mm/consistent.c + * + * Copyright (C) 2004 Paul Mundt + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/mm.h> +#include <linux/dma-mapping.h> +#include <asm/io.h> + +void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle) +{ + struct page *page, *end, *free; + void *ret; + int order; + + size = PAGE_ALIGN(size); + order = get_order(size); + + page = alloc_pages(gfp, order); + if (!page) + return NULL; + + ret = page_address(page); + *handle = virt_to_phys(ret); + + /* + * We must flush the cache before we pass it on to the device + */ + dma_cache_wback_inv(ret, size); + + page = virt_to_page(ret); + free = page + (size >> PAGE_SHIFT); + end = page + (1 << order); + + while (++page < end) { + set_page_count(page, 1); + + /* Free any unused pages */ + if (page >= free) { + __free_page(page); + } + } + + return P2SEGADDR(ret); +} + +void consistent_free(void *vaddr, size_t size) +{ + unsigned long addr = P1SEGADDR((unsigned long)vaddr); + struct page *page=virt_to_page(addr); + int num_pages=(size+PAGE_SIZE-1) >> PAGE_SHIFT; + int i; + + for(i=0;i<num_pages;i++) { + __free_page((page+i)); + } +} + +void consistent_sync(void *vaddr, size_t size, int direction) +{ + void * p1addr = (void*) P1SEGADDR((unsigned long)vaddr); + + switch (direction) { + case DMA_FROM_DEVICE: /* invalidate only */ + dma_cache_inv(p1addr, size); + break; + case DMA_TO_DEVICE: /* writeback only */ + dma_cache_wback(p1addr, size); + break; + case DMA_BIDIRECTIONAL: /* writeback and invalidate */ + dma_cache_wback_inv(p1addr, size); + break; + default: + BUG(); + } +} + +EXPORT_SYMBOL(consistent_alloc); +EXPORT_SYMBOL(consistent_free); +EXPORT_SYMBOL(consistent_sync); + |