> -----Original Message----- > From: Bjorn Helgaas [mailto:helgaas@xxxxxxxxxx] > Sent: 21 October 2015 23:15 > To: Wangzhou (B) > Cc: Bjorn Helgaas; jingoohan1@xxxxxxxxx; pratyush.anand@xxxxxxxxx; Arnd > Bergmann; linux@xxxxxxxxxxxxxxxx; thomas.petazzoni@xxxxxxxxxxxxxxxxxx; > Gabriele Paoloni; lorenzo.pieralisi@xxxxxxx; james.morse@xxxxxxx; > Liviu.Dudau@xxxxxxx; jason@xxxxxxxxxxxxxx; robh@xxxxxxxxxx; > gabriel.fernandez@xxxxxxxxxx; Minghuan.Lian@xxxxxxxxxxxxx; linux- > pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; > devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; zhangjukuo; > qiuzhenfa; liudongdong (C); qiujiang; xuwei (O); Liguozhu (Kenneth) > Subject: Re: [PATCH v11 1/6] PCI: designware: move calculation of bus > addresses to DRA7xx > > Hi Zhou & Gabriele, Hi Bjorn, thanks for reviewing > > On Fri, Oct 16, 2015 at 06:23:36PM +0800, Zhou Wang wrote: > > From: gabriele paoloni <gabriele.paoloni@xxxxxxxxxx> > > > > Commit f4c55c5a3f7f ("PCI: designware: Program ATU with untranslated > > address") added the calculation of PCI BUS addresses in designware, > > storing them in new fields added in "struct pcie_port". This > > calculation is done for every designware user even if is only > > applicable to DRA7xx. > > This patch moves the calculation of the bus addresses to the DRA7xx > > driver and is needed to allow the rework of designware to use > > the new DT parsing API. > > > > Signed-off-by: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx> > > Signed-off-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx> > > Acked-by: Pratyush Anand <pratyush.anand@xxxxxxxxx> > > --- > > drivers/pci/host/pci-dra7xx.c | 13 +++++++++++++ > > drivers/pci/host/pcie-designware.c | 15 ++++----------- > > 2 files changed, 17 insertions(+), 11 deletions(-) > > > > diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c > > index 199e29a..ebdffa0 100644 > > --- a/drivers/pci/host/pci-dra7xx.c > > +++ b/drivers/pci/host/pci-dra7xx.c > > @@ -62,6 +62,7 @@ > > > > #define PCIECTRL_DRA7XX_CONF_PHY_CS 0x010C > > #define LINK_UP BIT(16) > > +#define CPU_TO_BUS_ADDR 0x0FFFFFFF > > "CPU_TO_BUS_ADDR" is a very generic name. Since you do have DRA7XX in > other #defines and static symbols in this file, maybe it could be DRA7XX to > make it obvious that it only applies here? Ok will change to DRA7XX_CPU_TO_BUS_ADRR in v12 > > > > > struct dra7xx_pcie { > > void __iomem *base; > > @@ -151,6 +152,18 @@ static void dra7xx_pcie_enable_interrupts(struct > pcie_port *pp) > > static void dra7xx_pcie_host_init(struct pcie_port *pp) > > { > > dw_pcie_setup_rc(pp); > > + > > + if (pp->io_mod_base) > > + pp->io_mod_base &= CPU_TO_BUS_ADDR; > > These are equivalent to > > pp->io_mod_base &= CPU_TO_BUS_ADDR; > > (You don't need to test whether they're zero first.) > Yes agreed, will change in v12 > > + > > + if (pp->mem_mod_base) > > + pp->mem_mod_base &= CPU_TO_BUS_ADDR; > > + > > + if (pp->cfg0_mod_base) { > > + pp->cfg0_mod_base &= CPU_TO_BUS_ADDR; > > + pp->cfg1_mod_base &= CPU_TO_BUS_ADDR; > > + } > > + > > dra7xx_pcie_establish_link(pp); > > if (IS_ENABLED(CONFIG_PCI_MSI)) > > dw_pcie_msi_init(pp); > > diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie- > designware.c > > index 52aa6e3..75338a6 100644 > > --- a/drivers/pci/host/pcie-designware.c > > +++ b/drivers/pci/host/pcie-designware.c > > @@ -365,14 +365,10 @@ int dw_pcie_host_init(struct pcie_port *pp) > > struct of_pci_range range; > > struct of_pci_range_parser parser; > > struct resource *cfg_res; > > - u32 val, na, ns; > > + u32 val, ns; > > const __be32 *addrp; > > int i, index, ret; > > > > - /* Find the address cell size and the number of cells in order to get > > - * the untranslated address. > > - */ > > - of_property_read_u32(np, "#address-cells", &na); > > ns = of_n_size_cells(np); > > > > cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config"); > > @@ -415,8 +411,7 @@ int dw_pcie_host_init(struct pcie_port *pp) > > pp->io_base = range.cpu_addr; > > > > /* Find the untranslated IO space address */ > > - pp->io_mod_base = of_read_number(parser.range - > > - parser.np + na, ns); > > + pp->io_mod_base = range.cpu_addr; > > So apparently > > "of_read_number() == range.cpu_addr & CPU_TO_BUS_ADDR" on DRA7xx > "of_read_number() == range.cpu_addr" everywhere else? Yes correct > > Is that right? Is that a valid assumption, i.e., are we assuming > anything about DTs in the field that we shouldn't? Before I wrote a patch that was generic to accommodate intermediate level of translation between PCI_addr -> BUS_addr -> CPU_addr http://lists.infradead.org/pipermail/linux-arm-kernel/2015-July/360922.html After discussion we agreed to solve it with a bitmask rather than adding a field to of_pci_range to make it generic. The bitmask only applies to DRA7xx > > > } > > if (restype == IORESOURCE_MEM) { > > of_pci_range_to_resource(&range, np, &pp->mem); > > @@ -425,8 +420,7 @@ int dw_pcie_host_init(struct pcie_port *pp) > > pp->mem_bus_addr = range.pci_addr; > > > > /* Find the untranslated MEM space address */ > > - pp->mem_mod_base = of_read_number(parser.range - > > - parser.np + na, ns); > > + pp->mem_mod_base = range.cpu_addr; > > } > > if (restype == 0) { > > of_pci_range_to_resource(&range, np, &pp->cfg); > > @@ -436,8 +430,7 @@ int dw_pcie_host_init(struct pcie_port *pp) > > pp->cfg1_base = pp->cfg.start + pp->cfg0_size; > > > > /* Find the untranslated configuration space address */ > > - pp->cfg0_mod_base = of_read_number(parser.range - > > - parser.np + na, ns); > > + pp->cfg0_mod_base = range.cpu_addr; > > pp->cfg1_mod_base = pp->cfg0_mod_base + > > pp->cfg0_size; > > } > > -- > > 1.9.1 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > Please read the FAQ at http://www.tux.org/lkml/ -- 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
