Hi Jinhoo: > -----Original Message----- > From: linux-pci-owner@xxxxxxxxxxxxxxx [mailto:linux-pci-owner@xxxxxxxxxxxxxxx] > On Behalf Of Jingoo Han > Sent: Tuesday, December 10, 2013 3:03 PM > To: 'Marek Vasut'; Zhu Richard-R65037 > Cc: 'Mohit KUMAR DCG'; 'Pratyush ANAND'; 'Arnd Bergmann'; 'Kishon Vijay > Abraham I'; linux-pci@xxxxxxxxxxxxxxx; 'Tim Harvey'; 'Jingoo Han' > Subject: Re: [Query/Discussion]: IO translation with designware PCIe > controller > > On Tuesday, December 10, 2013 3:31 PM, Mohit KUMAR DCG wrote: > > On Tuesday, December 10, 2013 10:55 AM, Jingoo Han wrote: > > > On Tuesday, December 10, 2013 1:34 PM, Pratyush Anand wrote: > > > > On Tue, Dec 10, 2013 at 12:09:37AM +0800, Arnd Bergmann wrote: > > > > > On Monday 09 December 2013, Pratyush Anand wrote: > > > > > > > I think it does handle this correctly, look at > > > > > > > > > > > > > > static int dw_pcie_setup(int nr, struct pci_sys_data *sys) { > > > > > > > ... > > > > > > > if (global_io_offset < SZ_1M && pp->config.io_size > 0) { > > > > > > > sys->io_offset = global_io_offset - pp- > >config.io_bus_addr; > > > > > > > pci_ioremap_io(sys->io_offset, pp->io.start); > > > > > > > global_io_offset += SZ_64K; > > > > > > > pci_add_resource_offset(&sys->resources, &pp->io, > > > > > > > sys->io_offset); > > > > > > > } > > > > > > > ... > > > > > > > } > > > > > > > > > > > > > > I believe this does the right thing, but you have to put the > > > > > > > correct translation into the 'ranges' property of the host > > > > > > > bridge node > > > in DT. > > > > > > > > > > > > May be not exactly. pp->io is the realio, and it is passed > > > > > > correctly to pci_add_resource_offset. But, as you had also > > > > > > said that pci_ioremap_io will receive cpu physical address > > > > > > space as input, therefore I think following modification will > > > > > > be needed to work io transaction properly. > > > > > > > > > > I see. I think you are right. > > > > > > > > > > > diff --git a/drivers/pci/host/pcie-designware.c > > > > > > b/drivers/pci/host/pcie-designware.c > > > > > > index be6ce30..cf68632 100644 > > > > > > --- a/drivers/pci/host/pcie-designware.c > > > > > > +++ b/drivers/pci/host/pcie-designware.c > > > > > > @@ -378,6 +378,7 @@ int __init dw_pcie_host_init(struct > > > > > > pcie_port > > > *pp) > > > > > > + global_io_offset); > > > > > > pp->config.io_size = resource_size(&pp->io); > > > > > > pp->config.io_bus_addr = range.pci_addr; > > > > > > + pp->io_base = range.cpu_addr; > > > > > > } > > > > > > if (restype == IORESOURCE_MEM) { > > > > > > of_pci_range_to_resource(&range, np, &pp->mem); > > > @@ -403,7 > > > > > > +404,6 @@ int __init dw_pcie_host_init(struct pcie_port *pp) > > > > > > > > > > > > pp->cfg0_base = pp->cfg.start; > > > > > > pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size; > > > > > > - pp->io_base = pp->io.start; > > > > > > pp->mem_base = pp->mem.start; > > > > > > > > > > > > pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base, > > > > > > > > > > This looks correct to me and it seems to also fix a bug in > > > > > dw_pcie_prog_viewport_io_outbound if I read this correctly. > > > > > > > > Yes, now outbound viewport for IO translation will get correct > > > > input address. > > > > > > > > > > > > > > > @@ -667,7 +667,7 @@ static int dw_pcie_setup(int nr, struct > > > > > > pci_sys_data *sys) > > > > > > > > > > > > if (global_io_offset < SZ_1M && pp->config.io_size > 0) { > > > > > > sys->io_offset = global_io_offset - pp->config.io_bus_addr; > > > > > > - pci_ioremap_io(sys->io_offset, pp->io.start); > > > > > > + pci_ioremap_io(sys->io_offset, pp->io_base); > > > > > > global_io_offset += SZ_64K; > > > > > > pci_add_resource_offset(&sys->resources, &pp->io, > > > > > > sys->io_offset); > > > > > > > > > > I think there is still a related bug in here: we should pass > > > > > global_io_offset rather than sys->io_offset to pci_ioremap_io, > > > > > so we map the new window into the first available spot in the > > > > > Linux view of the I/O space, rather than passing a number that > > > > > might be zero for any bus, if the 'ranges' are set up to have an > > > > > identity mapping between Linux I/O spaces and PCI I/O spaces. > > > > > You should be able to verify this by setting the I/O range for > > > > > the bus to a random 4KB multiple in DT and observe that Linux > > > > > start allocating ports from 0x1000 > > > but the raw BAR values would contain the value you have chosen. > > > > > > > > OK. > > > > > > > > @ Jingoo, Mohit > > > > - Now its working properly for SPEAr1310 tested with directly > > connected EP(xhc cards) as well as EP Connected through switch(Lecroy > > PTC in AIC mode). Without this patch my EP devices were not working > > when connected through Switch. > > Hi Marek, Richard, > > How about testing the following Pratyush's patch on imx6 platform with the > Pericom PI7C9X2G303EL PCIe switch? > > As Mohit tested, it looks to resolve the i.MX6 problem when the PCIe switch is > connected to the i.MX6 platform. > > Best regards, > Jingoo Han > [Richard] Sorry to reply late, I went to hospital in the past two days. This patch is great, I tested at my side, it works, thanks a lot. > [.....] > > diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie- > designware.c > index be6ce30..b83f5e8 100644 > --- a/drivers/pci/host/pcie-designware.c > +++ b/drivers/pci/host/pcie-designware.c > @@ -378,6 +378,7 @@ int __init dw_pcie_host_init(struct pcie_port *pp) > + global_io_offset); > pp->config.io_size = resource_size(&pp->io); > pp->config.io_bus_addr = range.pci_addr; > + pp->io_base = range.cpu_addr; > } > if (restype == IORESOURCE_MEM) { > of_pci_range_to_resource(&range, np, &pp->mem); @@ -403,7 > +404,6 @@ int __init dw_pcie_host_init(struct pcie_port *pp) > > pp->cfg0_base = pp->cfg.start; > pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size; > - pp->io_base = pp->io.start; > pp->mem_base = pp->mem.start; > > pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base, @@ -667,7 +667,7 > @@ static int dw_pcie_setup(int nr, struct pci_sys_data *sys) > > if (global_io_offset < SZ_1M && pp->config.io_size > 0) { > sys->io_offset = global_io_offset - pp->config.io_bus_addr; > - pci_ioremap_io(sys->io_offset, pp->io.start); > + pci_ioremap_io(global_io_offset, pp->io_base); > global_io_offset += SZ_64K; > pci_add_resource_offset(&sys->resources, &pp->io, > sys->io_offset); > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in the > body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at > http://vger.kernel.org/majordomo-info.html > Best Regards Richard Zhu -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
