diff options
Diffstat (limited to 'Documentation/arm')
| -rw-r--r-- | Documentation/arm/Samsung-S3C24XX/DMA.txt | 46 | ||||
| -rw-r--r-- | Documentation/arm/Samsung-S3C24XX/Overview.txt | 21 |
2 files changed, 63 insertions, 4 deletions
diff --git a/Documentation/arm/Samsung-S3C24XX/DMA.txt b/Documentation/arm/Samsung-S3C24XX/DMA.txt new file mode 100644 index 00000000000..37f4edcc5d8 --- /dev/null +++ b/Documentation/arm/Samsung-S3C24XX/DMA.txt @@ -0,0 +1,46 @@ + S3C2410 DMA + =========== + +Introduction +------------ + + The kernel provides an interface to manage DMA transfers + 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. + + +DMA Channel Ordering +-------------------- + + Many of the range do not have connections for the DMA + 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 + 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. + + 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 + __initdata. + + +Authour +------- + +Ben Dooks, +Copyright (c) 2007 Ben Dooks, Simtec Electronics +Licensed under the GPL v2 diff --git a/Documentation/arm/Samsung-S3C24XX/Overview.txt b/Documentation/arm/Samsung-S3C24XX/Overview.txt index 28d014714ab..c31b76fa66c 100644 --- a/Documentation/arm/Samsung-S3C24XX/Overview.txt +++ b/Documentation/arm/Samsung-S3C24XX/Overview.txt @@ -8,13 +8,10 @@ Introduction The Samsung S3C24XX range of ARM9 System-on-Chip CPUs are supported by the 's3c2410' architecture of ARM Linux. Currently the S3C2410, - S3C2440 and S3C2442 devices are supported. + S3C2412, S3C2413, S3C2440 and S3C2442 devices are supported. Support for the S3C2400 series is in progress. - Support for the S3C2412 and S3C2413 CPUs is being merged. - - Configuration ------------- @@ -26,6 +23,22 @@ Configuration please check the machine specific documentation. +Layout +------ + + The core support files are located in the platform code contained in + arch/arm/plat-s3c24xx with headers in include/asm-arm/plat-s3c24xx. + This directory should be kept to items shared between the platform + code (arch/arm/plat-s3c24xx) and the arch/arm/mach-s3c24* code. + + Each cpu has a directory with the support files for it, and the + machines that carry the device. For example S3C2410 is contained + in arch/arm/mach-s3c2410 and S3C2440 in arch/arm/mach-s3c2440 + + Register, kernel and platform data definitions are held in the + include/asm-arm/arch-s3c2410 directory. + + Machines -------- |