diff options
Diffstat (limited to 'Documentation/arm/Samsung-S3C24XX/DMA.txt')
| -rw-r--r-- | Documentation/arm/Samsung-S3C24XX/DMA.txt | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/Documentation/arm/Samsung-S3C24XX/DMA.txt b/Documentation/arm/Samsung-S3C24XX/DMA.txt index 37f4edcc5d8..3ed82383efe 100644 --- a/Documentation/arm/Samsung-S3C24XX/DMA.txt +++ b/Documentation/arm/Samsung-S3C24XX/DMA.txt @@ -5,7 +5,7 @@ Introduction ------------ The kernel provides an interface to manage DMA transfers - using the DMA channels in the cpu, so that the central + using the DMA channels in the CPU, so that the central duty of managing channel mappings, and programming the channel generators is in one place. @@ -17,24 +17,24 @@ DMA Channel Ordering channels to all sources, which means that some devices have a restricted number of channels that can be used. - To allow flexibilty for each cpu type and board, the - dma code can be given an dma ordering structure which + To allow flexibility for each CPU type and board, the + DMA code can be given a DMA ordering structure which allows the order of channel search to be specified, as well as allowing the prohibition of certain claims. struct s3c24xx_dma_order has a list of channels, and - each channel within has a slot for a list of dma - channel numbers. The slots are searched in order, for - the presence of a dma channel number with DMA_CH_VALID - orred in. + each channel within has a slot for a list of DMA + channel numbers. The slots are searched in order for + the presence of a DMA channel number with DMA_CH_VALID + or-ed in. If the order has the flag DMA_CH_NEVER set, then after checking the channel list, the system will return no found channel, thus denying the request. A board support file can call s3c24xx_dma_order_set() - to register an complete ordering set. The routine will - copy the data, so the original can be discared with + to register a complete ordering set. The routine will + copy the data, so the original can be discarded with __initdata. |