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 fixes this patch fixes the bug in of_dma_get_range, > which with as is, parses the PCI memory ranges and return wrong > size as 0. > > in order to get largest possible dma_mask. this patch also > retuns the largest possible size based on dma-ranges, > > for e.g. > dma-ranges = <0x43000000 0x00 0x00 0x00 0x00 0x80 0x00>; > we should get dev->coherent_dma_mask=0x7fffffffff. > > based on which iova allocation space will honour PCI host > bridge limitations. > > Bug: SOC-5216 > Change-Id: I4c534bdd17e70c6b27327d39d1656e8ed0cf56d6 > Signed-off-by: Oza Pawandeep <oza.oza@xxxxxxxxxxxx> > Reviewed-on: http://gerrit-ccxsw.broadcom.net/40762 > Reviewed-by: vpx_checkpatch status <vpx_checkpatch@xxxxxxxxxxxx> > Reviewed-by: CCXSW <ccxswbuild@xxxxxxxxxxxx> > Reviewed-by: Scott Branden <scott.branden@xxxxxxxxxxxx> > Tested-by: vpx_autobuild status <vpx_autobuild@xxxxxxxxxxxx> > Tested-by: vpx_smoketest status <vpx_smoketest@xxxxxxxxxxxx> > > diff --git a/drivers/of/address.c b/drivers/of/address.c > index 02b2903..f7734fc 100644 > --- a/drivers/of/address.c > +++ b/drivers/of/address.c > @@ -6,6 +6,7 @@ > #include <linux/ioport.h> > #include <linux/module.h> > #include <linux/of_address.h> > +#include <linux/of_pci.h> > #include <linux/pci.h> > #include <linux/pci_regs.h> > #include <linux/sizes.h> > @@ -830,6 +831,54 @@ int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *siz > int ret = 0; > u64 dmaaddr; > > +#ifdef CONFIG_PCI > + struct resource_entry *window; > + LIST_HEAD(res); > + > + if (!node) > + return -EINVAL; > + > + if (of_bus_pci_match(np)) { You are not following what I'm saying. Let me spell it out: - Add a get_dma_ranges() function to of_bus struct. Or maybe should cover ranges too (e.g. get_ranges). I'm not sure. - Convert existing contents of this function to of_bus_default_dma_get_ranges and add that to the default of_bus struct. - Make of_dma_get_range call of_bus_match() and then bus->get_dma_ranges. Rob
