From: gabriele paoloni <gabriele.paoloni@xxxxxxxxxx> This patch is needed port PCIe designware to new DT parsing API As discussed in http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/317743.html in designware we have a problem as the PCI addresses in the PCIe controller address space are required in order to perform correct HW operation. In order to solve this problem commit f4c55c5a3f7f68c06cc559ed7af8b2d017cbb0a7 "PCI: designware: Program ATU with untranslated address" added code to read the PCIe controller start address directly from the DT ranges. In the new DT parsing API of_pci_get_host_bridge_resources() hides the DT parser from the host controller drivers, so it is not possible for drivers to parse values directly from the DT. In http://www.spinics.net/lists/linux-pci/msg42540.html we already tried to use the new DT parsing API but there is a bug (obviously) in setting the <*>_mod_base addresses Applying this patch we can easily set "<*>_mod_base = win->__res.start" This patch adds a new field in "struct of_pci_range" to store the pci controller start address; it fills the field in of_pci_range_parser_one(); in of_pci_get_host_bridge_resources() it retrieve the resource entry after it is created and added to the resource list and uses entry->__res.start to store the pci controller address the patch is based on 4.2-rc1 Signed-off-by: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx> --- drivers/of/address.c | 1 + drivers/of/of_pci.c | 4 ++++ drivers/pci/host/pcie-designware.c | 9 +++------ include/linux/of_address.h | 1 + 4 files changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/of/address.c b/drivers/of/address.c index 8bfda6a..52f9321 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -265,6 +265,7 @@ struct of_pci_range *of_pci_range_parser_one(struct of_pci_range_parser *parser, range->pci_addr = of_read_number(parser->range + 1, ns); range->cpu_addr = of_translate_address(parser->node, parser->range + na); + range->pci_ctrl_addr = of_read_number(parser->range + na, ns); range->size = of_read_number(parser->range + parser->pna + na, ns); parser->range += parser->np; diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index 5751dc5..2ccc749 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -198,6 +198,7 @@ int of_pci_get_host_bridge_resources(struct device_node *dev, pr_debug("Parsing ranges property...\n"); for_each_of_pci_range(&parser, &range) { + struct resource_entry *entry; /* Read next ranges element */ if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO) snprintf(range_type, 4, " IO"); @@ -240,6 +241,9 @@ int of_pci_get_host_bridge_resources(struct device_node *dev, } pci_add_resource_offset(resources, res, res->start - range.pci_addr); + entry = list_last_entry(resources, struct resource_entry, node); + /*we are using __res for storing the PCI controller address*/ + entry->__res.start = range.pci_ctrl_addr; } return 0; diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index 69486be..106dae6 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -416,8 +416,7 @@ 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.pci_ctrl_addr; } if (restype == IORESOURCE_MEM) { of_pci_range_to_resource(&range, np, &pp->mem); @@ -426,8 +425,7 @@ 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.pci_ctrl_addr; } if (restype == 0) { of_pci_range_to_resource(&range, np, &pp->cfg); @@ -437,8 +435,7 @@ 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.pci_ctrl_addr; pp->cfg1_mod_base = pp->cfg0_mod_base + pp->cfg0_size; } diff --git a/include/linux/of_address.h b/include/linux/of_address.h index d88e81b..55bb1ae 100644 --- a/include/linux/of_address.h +++ b/include/linux/of_address.h @@ -16,6 +16,7 @@ struct of_pci_range { u32 pci_space; u64 pci_addr; u64 cpu_addr; + u64 pci_ctrl_addr; u64 size; u32 flags; }; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
