RE: [uclinux-dist-devel] [PATCH 2/9] blackfin: Providedma_mmap_coherent() and dma_get_sgtable()

[Jiang, Scott]

From: uclinux-dist-devel-bounces@xxxxxxxxxxxxxxxxxxxx [mailto:uclinux-dist-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Geert Uytterhoeven
Sent: Sunday, January 13, 2013 6:45 PM
To: linux-arch@xxxxxxxxxxxxxxx
Cc: uclinux-dist-devel@xxxxxxxxxxxxxxxxxxxx; Geert Uytterhoeven; linux-kernel@xxxxxxxxxxxxxxx; Marek Szyprowski
Subject: [uclinux-dist-devel] [PATCH 2/9] blackfin: Provide dma_mmap_coherent() and dma_get_sgtable()

blackfin/allmodconfig:

drivers/media/v4l2-core/videobuf2-dma-contig.c: In function âvb2_dc_mmapâ:
drivers/media/v4l2-core/videobuf2-dma-contig.c:204: error: implicit declaration of function âdma_mmap_coherentâ
drivers/media/v4l2-core/videobuf2-dma-contig.c: In function âvb2_dc_get_base_sgtâ:
drivers/media/v4l2-core/videobuf2-dma-contig.c:387: error: implicit declaration of function âdma_get_sgtableâ

For architectures using dma_map_ops, dma_mmap_coherent() and
dma_get_sgtable() are provided in <asm-generic/dma-mapping-common.h>.

Blackfin does not use dma_map_ops, hence it should implement them as inline stubs using dma_common_mmap() and dma_common_get_sgtable().

Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Acked-by: Scott Jiang <scott.jiang.linux@xxxxxxxxx>

---
 arch/blackfin/include/asm/dma-mapping.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/blackfin/include/asm/dma-mapping.h b/arch/blackfin/include/asm/dma-mapping.h
index bbf4610..054d9ec 100644
--- a/arch/blackfin/include/asm/dma-mapping.h
+++ b/arch/blackfin/include/asm/dma-mapping.h
@@ -154,4 +154,14 @@ dma_cache_sync(struct device *dev, void *vaddr, size_t size,
        _dma_sync((dma_addr_t)vaddr, size, dir);  }

+/* drivers/base/dma-mapping.c */
+extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
+                          void *cpu_addr, dma_addr_t dma_addr, size_t size); extern int
+dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
+                                 void *cpu_addr, dma_addr_t dma_addr,
+                                 size_t size);
+
+#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
+#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v,
+h, s)
+
 #endif                         /* _BLACKFIN_DMA_MAPPING_H */
--
1.7.0.4

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