From c9af956cf7548bc352557eb8356913e489fd8716 Mon Sep 17 00:00:00 2001 From: David Howells <dhowells@redhat.com> Date: Wed, 15 Oct 2008 16:50:53 +0100 Subject: FRV: Provide dma_map_page() for NOMMU and fix comments Provide dma_map_page() for the NOMMU-mode FRV arch. Also do some fixing on the comments attached to the various DMA functions for both MMU and NOMMU mode FRV code. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- arch/frv/mb93090-mb00/pci-dma-nommu.c | 23 ++++++++++++++++++++--- arch/frv/mb93090-mb00/pci-dma.c | 11 +++++++++-- 2 files changed, 29 insertions(+), 5 deletions(-) (limited to 'arch/frv') diff --git a/arch/frv/mb93090-mb00/pci-dma-nommu.c b/arch/frv/mb93090-mb00/pci-dma-nommu.c index 64ee58d748be..52ff9aec799d 100644 --- a/arch/frv/mb93090-mb00/pci-dma-nommu.c +++ b/arch/frv/mb93090-mb00/pci-dma-nommu.c @@ -111,7 +111,7 @@ EXPORT_SYMBOL(dma_free_coherent); * The 32-bit bus address to use is returned. * * Once the device is given the dma address, the device owns this memory - * until either pci_unmap_single or pci_dma_sync_single is performed. + * until either dma_unmap_single or pci_dma_sync_single is performed. */ dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction direction) @@ -129,7 +129,7 @@ EXPORT_SYMBOL(dma_map_single); /* * Map a set of buffers described by scatterlist in streaming * mode for DMA. This is the scather-gather version of the - * above pci_map_single interface. Here the scatter gather list + * above dma_map_single interface. Here the scatter gather list * elements are each tagged with the appropriate dma address * and length. They are obtained via sg_dma_{address,length}(SG). * @@ -139,7 +139,7 @@ EXPORT_SYMBOL(dma_map_single); * The routine returns the number of addr/length pairs actually * used, at most nents. * - * Device ownership issues as mentioned above for pci_map_single are + * Device ownership issues as mentioned above for dma_map_single are * the same here. */ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, @@ -158,3 +158,20 @@ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, } EXPORT_SYMBOL(dma_map_sg); + +/* + * Map a single page of the indicated size for DMA in streaming mode. + * The 32-bit bus address to use is returned. + * + * Device ownership issues as mentioned above for dma_map_single are + * the same here. + */ +dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, + size_t size, enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); + flush_dcache_page(page); + return (dma_addr_t) page_to_phys(page) + offset; +} + +EXPORT_SYMBOL(dma_map_page); diff --git a/arch/frv/mb93090-mb00/pci-dma.c b/arch/frv/mb93090-mb00/pci-dma.c index 662f7b12d005..3ddedebc4eb3 100644 --- a/arch/frv/mb93090-mb00/pci-dma.c +++ b/arch/frv/mb93090-mb00/pci-dma.c @@ -61,7 +61,7 @@ EXPORT_SYMBOL(dma_map_single); /* * Map a set of buffers described by scatterlist in streaming * mode for DMA. This is the scather-gather version of the - * above pci_map_single interface. Here the scatter gather list + * above dma_map_single interface. Here the scatter gather list * elements are each tagged with the appropriate dma address * and length. They are obtained via sg_dma_{address,length}(SG). * @@ -71,7 +71,7 @@ EXPORT_SYMBOL(dma_map_single); * The routine returns the number of addr/length pairs actually * used, at most nents. * - * Device ownership issues as mentioned above for pci_map_single are + * Device ownership issues as mentioned above for dma_map_single are * the same here. */ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, @@ -105,6 +105,13 @@ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, EXPORT_SYMBOL(dma_map_sg); +/* + * Map a single page of the indicated size for DMA in streaming mode. + * The 32-bit bus address to use is returned. + * + * Device ownership issues as mentioned above for dma_map_single are + * the same here. + */ dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction) { -- cgit v1.2.3