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[POWERPC] PS3: Fix DMA scatter-gather 

Add the missing pieces to support DMA scatter-gather on the PS3 system bus.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Geoff Levand 2007-01-30 15:20:34 -08:00 committed by Paul Mackerras
parent 97ec167599
commit 35063bb2ea
1 changed files with 21 additions and 2 deletions
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23
arch/powerpc/platforms/ps3/system-bus.c
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@ -272,10 +272,29 @@ static void ps3_unmap_single(struct device *_dev, dma_addr_t dma_addr,
static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction)
{
struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
int i;
#if defined(CONFIG_PS3_DYNAMIC_DMA)
BUG_ON("do");
return -EPERM;
#else
for (i = 0; i < nents; i++, sg++) {
int result = ps3_dma_map(dev->d_region,
page_to_phys(sg->page) + sg->offset, sg->length,
&sg->dma_address);
if (result) {
pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
__func__, __LINE__, result);
return -EINVAL;
}
sg->dma_length = sg->length;
}
return nents;
#endif
return 0;
}
static void ps3_unmap_sg(struct device *_dev, struct scatterlist *sg,
@ -288,7 +307,7 @@ static void ps3_unmap_sg(struct device *_dev, struct scatterlist *sg,
static int ps3_dma_supported(struct device *_dev, u64 mask)
{
return 1;
return mask >= DMA_32BIT_MASK;
}
static struct dma_mapping_ops ps3_dma_ops = {