[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>

1 files changed, 21 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c
index 9f2c6a909e4d..bce6136cbce7 100644
--- a/arch/powerpc/platforms/ps3/system-bus.c
+++ b/arch/powerpc/platforms/ps3/system-bus.c
@@ -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 = {