X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=Documentation%2FDMA-mapping.txt;h=028614cdd0624291f630d3cdda899cf02335ed2b;hb=dd7f2928d834f7ac67202bcdf24a44ba9b138f08;hp=7c717699032c90f403432ef793cfeed8c359fe7b;hpb=a748422ee45725e04e1d3792fa19dfa90ddfd116;p=linux-2.6-omap-h63xx.git diff --git a/Documentation/DMA-mapping.txt b/Documentation/DMA-mapping.txt index 7c717699032..028614cdd06 100644 --- a/Documentation/DMA-mapping.txt +++ b/Documentation/DMA-mapping.txt @@ -107,7 +107,7 @@ The query is performed via a call to pci_set_dma_mask(): int pci_set_dma_mask(struct pci_dev *pdev, u64 device_mask); -The query for consistent allocations is performed via a a call to +The query for consistent allocations is performed via a call to pci_set_consistent_dma_mask(): int pci_set_consistent_dma_mask(struct pci_dev *pdev, u64 device_mask); @@ -117,7 +117,7 @@ device_mask is a bit mask describing which bits of a PCI address your device supports. It returns zero if your card can perform DMA properly on the machine given the address mask you provided. -If it returns non-zero, your device can not perform DMA properly on +If it returns non-zero, your device cannot perform DMA properly on this platform, and attempting to do so will result in undefined behavior. You must either use a different mask, or not use DMA. @@ -698,12 +698,12 @@ these interfaces. Remember that, as defined, consistent mappings are always going to be SAC addressable. The first thing your driver needs to do is query the PCI platform -layer with your devices DAC addressing capabilities: +layer if it is capable of handling your devices DAC addressing +capabilities: - int pci_dac_set_dma_mask(struct pci_dev *pdev, u64 mask); + int pci_dac_dma_supported(struct pci_dev *hwdev, u64 mask); -This routine behaves identically to pci_set_dma_mask. You may not -use the following interfaces if this routine fails. +You may not use the following interfaces if this routine fails. Next, DMA addresses using this API are kept track of using the dma64_addr_t type. It is guaranteed to be big enough to hold any