Hello Kishon, > -----Original Message----- > From: Jingoo Han [mailto:jg1.han@xxxxxxxxxxx] > Sent: Thursday, March 27, 2014 5:15 PM > To: 'Kishon Vijay Abraham I'; Mohit KUMAR DCG; Pratyush ANAND > Cc: devicetree@xxxxxxxxxxxxxxx; linux-doc@xxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux- > omap@xxxxxxxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx; bhelgaas@xxxxxxxxxx; > robh+dt@xxxxxxxxxx; pawel.moll@xxxxxxx; mark.rutland@xxxxxxx; > ijc+devicetree@xxxxxxxxxxxxxx; galak@xxxxxxxxxxxxxx; rob@xxxxxxxxxxx; > linux@xxxxxxxxxxxxxxxx; tony@xxxxxxxxxxx; rnayak@xxxxxx; > paul@xxxxxxxxx; 'Marek Vasut'; 'Richard Zhu' > Subject: Re: [RFC PATCH 03/12] pci: host: pcie-designware: Use *base-mask* > for configuring the iATU > > On Wednesday, March 26, 2014 10:58 PM, Kishon Vijay Abraham I wrote: > > > > In DRA7, the cpu sees 32bit address, but the pcie controller can see > > only 28bit address. So whenever the cpu issues a read/write request, > > the 4 most significant bits are used by L3 to determine the target controller. > > For example, the cpu reserves 0x2000_0000 - 0x2FFF_FFFF for PCIe > > controller but the PCIe controller will see only (0x000_0000 - > > 0xFFF_FFF). So for programming the outbound translation window the > *base* should be programmed as 0x000_0000. > > Whenever we try to write to say 0x2000_0000, it will be translated to > > whatever we have programmed in the translation window with base as > 0x000_0000. > > > > Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx> > > (+cc Pratyush Anand, Marek Vasut, Richard Zhu) > > Acked-by: Jingoo Han <jg1.han@xxxxxxxxxxx> > > Mohit Kumar, Pratyush Anand, > If you have other opinions, please let us know. :-) Thank you. > - Yes, looks more clean now. Acked-by: Mohit Kumar <mohit.kumar@xxxxxx> Regards, Mohit > Best regards, > Jingoo Han > > > --- > > .../devicetree/bindings/pci/designware-pcie.txt | 1 + > > drivers/pci/host/pcie-designware.c | 39 ++++++++++++++------ > > drivers/pci/host/pcie-designware.h | 1 + > > 3 files changed, 29 insertions(+), 12 deletions(-) > > > > diff --git a/Documentation/devicetree/bindings/pci/designware-pcie.txt > > b/Documentation/devicetree/bindings/pci/designware-pcie.txt > > index d6fae13..c574dd3 100644 > > --- a/Documentation/devicetree/bindings/pci/designware-pcie.txt > > +++ b/Documentation/devicetree/bindings/pci/designware-pcie.txt > > @@ -27,6 +27,7 @@ Optional properties for fsl,imx6q-pcie > > - power-on-gpio: gpio pin number of power-enable signal > > - wake-up-gpio: gpio pin number of incoming wakeup signal > > - disable-gpio: gpio pin number of outgoing rfkill/endpoint disable > > signal > > +- base-mask: address mask for the PCIe controller target port > > > > Example: > > > > diff --git a/drivers/pci/host/pcie-designware.c > > b/drivers/pci/host/pcie-designware.c > > index 17ce88f..98b661c 100644 > > --- a/drivers/pci/host/pcie-designware.c > > +++ b/drivers/pci/host/pcie-designware.c > > @@ -464,6 +464,9 @@ int __init dw_pcie_host_init(struct pcie_port *pp) > > return -EINVAL; > > } > > > > + if (of_property_read_u64(np, "base-mask", &pp->base_mask)) > > + pp->base_mask = ~(0x0ULL); > > + > > if (IS_ENABLED(CONFIG_PCI_MSI)) { > > pp->irq_domain = irq_domain_add_linear(pp->dev- > >of_node, > > MAX_MSI_IRQS, &msi_domain_ops, > > @@ -503,12 +506,15 @@ int __init dw_pcie_host_init(struct pcie_port > > *pp) > > > > static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 > > busdev) { > > + u64 cfg0_base; > > + > > + cfg0_base = pp->cfg0_base & pp->base_mask; > > /* Program viewport 0 : OUTBOUND : CFG0 */ > > dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | > PCIE_ATU_REGION_INDEX0, > > PCIE_ATU_VIEWPORT); > > - dw_pcie_writel_rc(pp, pp->cfg0_base, PCIE_ATU_LOWER_BASE); > > - dw_pcie_writel_rc(pp, (pp->cfg0_base >> 32), > PCIE_ATU_UPPER_BASE); > > - dw_pcie_writel_rc(pp, pp->cfg0_base + pp->config.cfg0_size - 1, > > + dw_pcie_writel_rc(pp, cfg0_base, PCIE_ATU_LOWER_BASE); > > + dw_pcie_writel_rc(pp, (cfg0_base >> 32), PCIE_ATU_UPPER_BASE); > > + dw_pcie_writel_rc(pp, cfg0_base + pp->config.cfg0_size - 1, > > PCIE_ATU_LIMIT); > > dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET); > > dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET); @@ -518,14 > +524,17 > > @@ static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 > > busdev) > > > > static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 > > busdev) { > > + u64 cfg1_base; > > + > > + cfg1_base = pp->cfg1_base & pp->base_mask; > > /* Program viewport 1 : OUTBOUND : CFG1 */ > > dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | > PCIE_ATU_REGION_INDEX1, > > PCIE_ATU_VIEWPORT); > > dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, PCIE_ATU_CR1); > > dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2); > > - dw_pcie_writel_rc(pp, pp->cfg1_base, PCIE_ATU_LOWER_BASE); > > - dw_pcie_writel_rc(pp, (pp->cfg1_base >> 32), > PCIE_ATU_UPPER_BASE); > > - dw_pcie_writel_rc(pp, pp->cfg1_base + pp->config.cfg1_size - 1, > > + dw_pcie_writel_rc(pp, cfg1_base, PCIE_ATU_LOWER_BASE); > > + dw_pcie_writel_rc(pp, (cfg1_base >> 32), PCIE_ATU_UPPER_BASE); > > + dw_pcie_writel_rc(pp, cfg1_base + pp->config.cfg1_size - 1, > > PCIE_ATU_LIMIT); > > dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET); > > dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET); @@ -533,14 > +542,17 > > @@ static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 > > busdev) > > > > static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port > *pp) > > { > > + u64 mem_base; > > + > > + mem_base = pp->mem_base & pp->base_mask; > > /* Program viewport 0 : OUTBOUND : MEM */ > > dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | > PCIE_ATU_REGION_INDEX0, > > PCIE_ATU_VIEWPORT); > > dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, PCIE_ATU_CR1); > > dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2); > > - dw_pcie_writel_rc(pp, pp->mem_base, PCIE_ATU_LOWER_BASE); > > - dw_pcie_writel_rc(pp, (pp->mem_base >> 32), > PCIE_ATU_UPPER_BASE); > > - dw_pcie_writel_rc(pp, pp->mem_base + pp->config.mem_size - 1, > > + dw_pcie_writel_rc(pp, mem_base, PCIE_ATU_LOWER_BASE); > > + dw_pcie_writel_rc(pp, (mem_base >> 32), PCIE_ATU_UPPER_BASE); > > + dw_pcie_writel_rc(pp, mem_base + pp->config.mem_size - 1, > > PCIE_ATU_LIMIT); > > dw_pcie_writel_rc(pp, pp->config.mem_bus_addr, > PCIE_ATU_LOWER_TARGET); > > dw_pcie_writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr), > > @@ -549,14 +561,17 @@ static void > > dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp) > > > > static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp) > > { > > + u64 io_base; > > + > > + io_base = pp->io_base & pp->base_mask; > > /* Program viewport 1 : OUTBOUND : IO */ > > dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | > PCIE_ATU_REGION_INDEX1, > > PCIE_ATU_VIEWPORT); > > dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, PCIE_ATU_CR1); > > dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2); > > - dw_pcie_writel_rc(pp, pp->io_base, PCIE_ATU_LOWER_BASE); > > - dw_pcie_writel_rc(pp, (pp->io_base >> 32), > PCIE_ATU_UPPER_BASE); > > - dw_pcie_writel_rc(pp, pp->io_base + pp->config.io_size - 1, > > + dw_pcie_writel_rc(pp, io_base, PCIE_ATU_LOWER_BASE); > > + dw_pcie_writel_rc(pp, (io_base >> 32), PCIE_ATU_UPPER_BASE); > > + dw_pcie_writel_rc(pp, io_base + pp->config.io_size - 1, > > PCIE_ATU_LIMIT); > > dw_pcie_writel_rc(pp, pp->config.io_bus_addr, > PCIE_ATU_LOWER_TARGET); > > dw_pcie_writel_rc(pp, upper_32_bits(pp->config.io_bus_addr), > > diff --git a/drivers/pci/host/pcie-designware.h > > b/drivers/pci/host/pcie-designware.h > > index 3063b35..3fa12a6 100644 > > --- a/drivers/pci/host/pcie-designware.h > > +++ b/drivers/pci/host/pcie-designware.h > > @@ -35,6 +35,7 @@ struct pcie_port { > > struct device *dev; > > u8 root_bus_nr; > > void __iomem *dbi_base; > > + u64 base_mask; > > u64 cfg0_base; > > void __iomem *va_cfg0_base; > > u64 cfg1_base; > > -- > > 1.7.9.5 -- 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
