| menu "DMA support" |
| |
| config SH_DMA |
| bool "DMA controller (DMAC) support" |
| help |
| Selecting this option will provide same API as PC's Direct Memory |
| Access Controller(8237A) for SuperH DMAC. |
| |
| If unsure, say N. |
| |
| config NR_ONCHIP_DMA_CHANNELS |
| depends on SH_DMA |
| int "Number of on-chip DMAC channels" |
| default "4" |
| help |
| This allows you to specify the number of channels that the on-chip |
| DMAC supports. This will be 4 for SH7750/SH7751 and 8 for the |
| SH7750R/SH7751R. |
| |
| config NR_DMA_CHANNELS_BOOL |
| depends on SH_DMA |
| bool "Override default number of maximum DMA channels" |
| help |
| This allows you to forcibly update the maximum number of supported |
| DMA channels for a given board. If this is unset, this will default |
| to the number of channels that the on-chip DMAC has. |
| |
| config NR_DMA_CHANNELS |
| int "Maximum number of DMA channels" |
| depends on SH_DMA && NR_DMA_CHANNELS_BOOL |
| default NR_ONCHIP_DMA_CHANNELS |
| help |
| This allows you to specify the maximum number of DMA channels to |
| support. Setting this to a higher value allows for cascading DMACs |
| with additional channels. |
| |
| config DMA_PAGE_OPS |
| bool "Use DMAC for page copy/clear" |
| depends on SH_DMA && BROKEN |
| help |
| Selecting this option will use a dual-address mode configured channel |
| in the SH DMAC for copy_page()/clear_page(). Primarily a performance |
| hack. |
| |
| config DMA_PAGE_OPS_CHANNEL |
| depends on DMA_PAGE_OPS |
| int "DMA channel for sh memory-manager page copy/clear" |
| default "3" |
| help |
| This allows the specification of the dual address dma channel, |
| in case channel 3 is unavailable. On the SH4, channels 1,2, and 3 |
| are dual-address capable. |
| |
| endmenu |
| |
