On Tue, May 2, 2017 at 11:46 PM, Oza Pawandeep <oza.oza@xxxxxxxxxxxx> wrote: > current device framework and of framework integration assumes > dma-ranges in a way where memory-mapped devices define their > dma-ranges. (child-bus-address, parent-bus-address, length). > > of_dma_configure is specifically written to take care of memory > mapped devices. but no implementation exists for pci to take > care of pcie based memory ranges. > > for e.g. iproc based SOCs and other SOCs(suc as rcar) have PCI > world dma-ranges. > dma-ranges = <0x43000000 0x00 0x00 0x00 0x00 0x80 0x00>; > > this patch serves following: > > 1) exposes interface to the pci host driver for their > inbound memory ranges > > 2) provide an interface to callers such as of_dma_get_ranges. > so then the returned size get best possible (largest) dma_mask. > because PCI RC drivers do not call APIs such as > dma_set_coherent_mask() and hence rather it shows its addressing > capabilities based on dma-ranges. > for e.g. > dma-ranges = <0x43000000 0x00 0x00 0x00 0x00 0x80 0x00>; > we should get dev->coherent_dma_mask=0x7fffffffff. > > 3) this patch handles multiple inbound windows and dma-ranges. > it is left to the caller, how it wants to use them. > the new function returns the resources in a standard and unform way > > 4) this way the callers of for e.g. of_dma_get_ranges > does not need to change. > > 5) leaves scope of adding PCI flag handling for inbound memory > by the new function. > > Bug: SOC-5216 > Change-Id: Ie045386df91e1e0587846bb147ae40d96f6d7d2e > Signed-off-by: Oza Pawandeep <oza.oza@xxxxxxxxxxxx> > Reviewed-on: http://gerrit-ccxsw.broadcom.net/40428 > Reviewed-by: vpx_checkpatch status <vpx_checkpatch@xxxxxxxxxxxx> > Reviewed-by: CCXSW <ccxswbuild@xxxxxxxxxxxx> > Reviewed-by: Ray Jui <ray.jui@xxxxxxxxxxxx> > Tested-by: vpx_autobuild status <vpx_autobuild@xxxxxxxxxxxx> > Tested-by: vpx_smoketest status <vpx_smoketest@xxxxxxxxxxxx> > Tested-by: CCXSW <ccxswbuild@xxxxxxxxxxxx> All these non-person, probably internal Broadcom Tested-by and Reviewed-by's should be removed too. > Reviewed-by: Scott Branden <scott.branden@xxxxxxxxxxxx> > Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
