On Mon, 2012-07-16 at 10:47 +0200, Guennadi Liakhovetski wrote: > > I want to know what does ccr and mid_rid mean to dmac here? > > CHCR contains a few fields, some enable various interrupt sources, some > specify repeat- and renew-modes, others yet specify transfer size, source > and destination address-modes (incrementing, constant, decrementing), > others yet select a DMA client category (slave / memcpy / ...), and a > transfer flag. Some of these fields could be calculated, others are > pre-defined for various slaves, the exact layout of those fields can also > vary between SoCs. I do not understand how clients would provide these values. For pre-defined values, they should be dmac property why should client like spi or mmc have clue about it?
For others like you mentioned, i guess they could be easily calculated, right? > MID_RID is actually a slave-selector, it contains a magic value, that > cannot be calculated. and again, how does client know this? -- ~Vinod -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
