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| author |   Michael Hennerich <michael.hennerich@analog.com> | 2009-09-23 11:32:52 +0000 |
|---|---|---|
| committer |   Mike Frysinger <vapier@gentoo.org> | 2009-12-15 00:13:51 -0500 |
| commit | cb5ae60f7a0b21b936c022a2e7f9303c60665233 (patch) | |
| tree | 6605a4dec5a881fa4436c36c18f985436b69bd0c /arch/blackfin/kernel/dma-mapping.c | |
| parent | Blackfin: clean up bf537-lq035 board resources (diff) | |
| download | linux-dev-cb5ae60f7a0b21b936c022a2e7f9303c60665233.tar.xz linux-dev-cb5ae60f7a0b21b936c022a2e7f9303c60665233.zip | |
Blackfin: convert DMA code to a proper bitmap
Rather than using our own data structures that basically boil down to a
bitmap, use the standard bitmap functions.
Reported-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/blackfin/kernel/dma-mapping.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/arch/blackfin/kernel/dma-mapping.c b/arch/blackfin/kernel/dma-mapping.c index e74e74d7733f..be81572b89c2 100644 --- a/arch/blackfin/kernel/dma-mapping.c +++ b/arch/blackfin/kernel/dma-mapping.c @@ -19,7 +19,7 @@ #include <asm/bfin-global.h> static spinlock_t dma_page_lock; -static unsigned int *dma_page; +static unsigned long *dma_page; static unsigned int dma_pages; static unsigned long dma_base; static unsigned long dma_size; @@ -30,7 +30,7 @@ void dma_alloc_init(unsigned long start, unsigned long end) spin_lock_init(&dma_page_lock); dma_initialized = 0; - dma_page = (unsigned int *)__get_free_page(GFP_KERNEL); + dma_page = (unsigned long *)__get_free_page(GFP_KERNEL); memset(dma_page, 0, PAGE_SIZE); dma_base = PAGE_ALIGN(start); dma_size = PAGE_ALIGN(end) - PAGE_ALIGN(start); @@ -58,10 +58,11 @@ static unsigned long __alloc_dma_pages(unsigned int pages) spin_lock_irqsave(&dma_page_lock, flags); for (i = 0; i < dma_pages;) { - if (dma_page[i++] == 0) { + if (test_bit(i++, dma_page) == 0) { if (++count == pages) { while (count--) - dma_page[--i] = 1; + __set_bit(--i, dma_page); + ret = dma_base + (i << PAGE_SHIFT); break; } @@ -84,9 +85,9 @@ static void __free_dma_pages(unsigned long addr, unsigned int pages) } spin_lock_irqsave(&dma_page_lock, flags); - for (i = page; i < page + pages; i++) { - dma_page[i] = 0; - } + for (i = page; i < page + pages; i++) + __clear_bit(i, dma_page); + spin_unlock_irqrestore(&dma_page_lock, flags); } |