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| author |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-08-30 19:23:52 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-09-02 14:07:32 +1000 |
| commit | 5b6e9ff6deb703b95fb355bb66d86096c1a2df09 (patch) | |
| tree | 81d76f282fba415681cda3d1e3690da46c3d17b2 /arch/powerpc/kernel/dma.c | |
| parent | powerpc: Use is_32bit_task() helper to test 32-bit binary (diff) | |
| download | linux-dev-5b6e9ff6deb703b95fb355bb66d86096c1a2df09.tar.xz linux-dev-5b6e9ff6deb703b95fb355bb66d86096c1a2df09.zip | |
powerpc/dma: Add optional platform override of dma_set_mask()
Some platforms may want to override dma_set_mask() to take into
account some specific "features" such as the availability of
a direct-map window in addition to an iommu.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/dma.c')
| -rw-r--r-- | arch/powerpc/kernel/dma.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c index 84d6367ec003..f368c075c90b 100644 --- a/arch/powerpc/kernel/dma.c +++ b/arch/powerpc/kernel/dma.c @@ -12,6 +12,7 @@ #include <linux/memblock.h> #include <asm/bug.h> #include <asm/abs_addr.h> +#include <asm/machdep.h> /* * Generic direct DMA implementation @@ -154,6 +155,23 @@ EXPORT_SYMBOL(dma_direct_ops); #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16) +int dma_set_mask(struct device *dev, u64 dma_mask) +{ + struct dma_map_ops *dma_ops = get_dma_ops(dev); + + if (ppc_md.dma_set_mask) + return ppc_md.dma_set_mask(dev, dma_mask); + if (unlikely(dma_ops == NULL)) + return -EIO; + if (dma_ops->set_dma_mask != NULL) + return dma_ops->set_dma_mask(dev, dma_mask); + if (!dev->dma_mask || !dma_supported(dev, dma_mask)) + return -EIO; + *dev->dma_mask = dma_mask; + return 0; +} +EXPORT_SYMBOL(dma_set_mask); + static int __init dma_init(void) { dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); |