Hi Jingoo, On Thu, Sep 12, 2013 at 03:15:04PM +0800, Jingoo Han wrote: > On Tuesday 23 July 2013 12:30 PM, Kishon Vijay Abraham I wrote: > > >> . > > >> . > > >>>>> + of_pci_range_to_resource(&range, np, &pp->cfg); > > >>>>> + pp->config.cfg0_size = resource_size(&pp->cfg)/2; > > >>>>> + pp->config.cfg1_size = resource_size(&pp->cfg)/2; > > >>>>> + } > > >>>>> + } > > >>>>> + > > >>>>> + pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start, > > >>>>> + resource_size(&pp->cfg)); > > >>>> > > >>>> Why is configuraion space divided into two? > > >>> > > >>> Sorry, I don't know the exact reason. :( > > >>> Pratyush Anand may know about this. > > >>> Pratyush Anand, could you answer the question? > > >>> > > >>> Also, if you find some problems, please let me know. > > > > One more query.. > > > > Where is inbound translation configuration done in your driver? how should it > > be done? > Yes, Kishon is right. Inbound translation configuration is missing in your code and I think it should be implemented. > Hi Kishon, > > Sorry, I cannot understand your question exactly. > However, the following thread would be helpful. > > http://www.spinics.net/lists/arm-kernel/msg252078.html > https://lkml.org/lkml/2013/6/17/890 >From this conversation, It seems that you have tested this driver and it works fine without inbound translation function. I am sure that you would have tested a PCIe card with DMA capability such as PCIe2USB or PCIe2Ethernet. Since it worked, it means that by default your controller is supporting one to one mapping in case of inbound transaction even when address translation is enabled. In my opinion you should call a function like as follows from dw_pcie_host_init in pcie-designware.c. It will insure one to one mapping for any inbound request in memory range 0 to (in_mem_size - 1) for all dw implementation. static void dw_pcie_prog_viewport_mem_inbound(struct pcie_port *pp) { u32 val; void __iomem *dbi_base = pp->dbi_base; /* Program viewport 0 : INBOUND : MEMORY*/ val = PCIE_ATU_REGION_INBOUND | (0 & 0xF); dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_VIEWPORT)); dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, dbi_base + PCIE_ATU_CR1)); val = PCIE_ATU_ENABLE | PCIE_ATU_BAR_MODE_ENABLE; dw_pcie_writel_rc(pp, val, dbi_base + PCIE_ATU_CR2)); dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_LOWER_BASE)); dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_BASE)); /* in_mem_size must be in power of 2 */ dw_pcie_writel_rc(pp, pp->config.in_mem_size - 1, dbi_base + PCIE_ATU_LIMIT)); dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_LOWER_TARGET)); dw_pcie_writel_rc(pp, 0, dbi_base + PCIE_ATU_UPPER_TARGET)); } Regards Pratyush > > Best regards. > Jingoo Han -- 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
