On Sep 18, 2014, at 3:52 AM, Archit Taneja <architt@xxxxxxxxxxxxxx> wrote: > The BAM DMA IP comes in different versions. The register offset layout varies > among these versions. The layouts depend on which generation/family of SoCs they > belong to. > > The current SoCs(like 8084, 8074) have a layout where the Top level registers > come in the beginning of the address range, followed by pipe and event > registers. The BAM revision numbers fall above 1.4.0. > > The older SoCs (like 8064, 8960) have a layout where the pipe registers come > first, and the top level come later. These have BAM revision numbers lesser than > 1.4.0. > > It isn't suitable to have macros provide the register offsets with the layouts > changed. Future BAM revisions may have different register layouts too. The > register addresses are now calculated by referring a table which contains a base > offset and multipliers for pipe/evnt/ee registers. > > We have a common function bam_addr() which computes addresses for all the > registers. When computing address of top level/ee registers, we pass 0 to the > pipe argument in addr() since they don't have any multiple instances. > > Some of the unused register definitions are removed. We can add new registers as > we need them. > > Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx> > --- > drivers/dma/qcom_bam_dma.c | 176 +++++++++++++++++++++++++++++---------------- > 1 file changed, 113 insertions(+), 63 deletions(-) Reviewed-by: Kumar Gala <galak@xxxxxxxxxxxxxx> - k -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
