Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> --- drivers/pci/Makefile | 1 + drivers/pci/of.c | 102 +++++++++++++++++++++++++++++++++++++++++++ drivers/pci/pci.c | 2 + include/linux/pci.h | 10 +++++ 4 files changed, 115 insertions(+) create mode 100644 drivers/pci/of.c diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile index c222f77b3b..69649fbcd2 100644 --- a/drivers/pci/Makefile +++ b/drivers/pci/Makefile @@ -3,6 +3,7 @@ # Makefile for the PCI bus specific drivers. # obj-y += pci.o bus.o pci_iomap.o host-bridge.o +obj-$(CONFIG_OFDEVICE) += of.o ccflags-$(CONFIG_PCI_DEBUG) := -DDEBUG diff --git a/drivers/pci/of.c b/drivers/pci/of.c new file mode 100644 index 0000000000..b1ee3fa938 --- /dev/null +++ b/drivers/pci/of.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * PCI <-> OF mapping helpers + * + * Copyright 2011 IBM Corp. + */ +#define pr_fmt(fmt) "PCI: OF: " fmt + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <of.h> +#include <of_address.h> +#include <common.h> +#include <linux/resource_ext.h> + +/** + * of_pci_get_host_bridge_resources() - parsing of PCI host bridge resources from DT + * @dev: host bridge device + * @resources: list where the range of resources will be added after DT parsing + * + * This function will parse the "ranges" property of a PCI host bridge device + * node and setup the resource mapping based on its content. It is expected + * that the property conforms with the Power ePAPR document. + * + * It returns zero if the range parsing has been successful or a standard error + * value if it failed. + */ +static int of_pci_get_host_bridge_resources(struct device *dev, + struct pci_controller *bridge) +{ + struct list_head *resources = &bridge->windows; + struct device_node *dev_node = dev->of_node; + struct resource *res, tmp_res; + struct of_pci_range range; + struct of_pci_range_parser parser; + const char *range_type; + int err; + + dev_dbg(dev, "host bridge %pOF ranges:\n", dev_node); + + /* Check for ranges property */ + err = of_pci_range_parser_init(&parser, dev_node); + if (err) + return 0; + + dev_dbg(dev, "Parsing ranges property...\n"); + for_each_of_pci_range(&parser, &range) { + /* Read next ranges element */ + if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO) + range_type = "IO"; + else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM) + range_type = "MEM"; + else + range_type = "err"; + dev_dbg(dev, " %6s %#012llx..%#012llx -> %#012llx\n", + range_type, range.cpu_addr, + range.cpu_addr + range.size - 1, range.pci_addr); + + /* + * If we failed translation or got a zero-sized region + * then skip this range + */ + if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) + continue; + + of_pci_range_to_resource(&range, dev_node, &tmp_res); + + res = kmemdup(&tmp_res, sizeof(tmp_res), GFP_KERNEL); + if (!res) { + err = -ENOMEM; + goto failed; + } + + pci_add_resource_offset(resources, res, res->start - range.pci_addr); + + switch (res->flags & IORESOURCE_TYPE_BITS) { + case IORESOURCE_IO: + bridge->io_resource = res; + break; + + case IORESOURCE_MEM: + if (res->flags & IORESOURCE_PREFETCH) + bridge->mem_pref_resource = res; + else + bridge->mem_resource = res; + break; + } + } + + return 0; + +failed: + return err; +} + +int of_pci_bridge_init(struct device *dev, struct pci_controller *bridge) +{ + if (!dev->of_node) + return 0; + + return of_pci_get_host_bridge_resources(dev, bridge); +} diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 0a238cd190..bc083270d9 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -45,6 +45,8 @@ static void pci_bus_register_devices(struct pci_bus *bus) void pci_controller_init(struct pci_controller *hose) { INIT_LIST_HEAD(&hose->windows); + + of_pci_bridge_init(hose->parent, hose); } void register_pci_controller(struct pci_controller *hose) diff --git a/include/linux/pci.h b/include/linux/pci.h index 11a60f66a9..f6511e0095 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -414,4 +414,14 @@ void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, struct pci_bus_region *region); +/* drivers/pci/of.c */ +#ifdef CONFIG_OFDEVICE +int of_pci_bridge_init(struct device *dev, struct pci_controller *bridge); +#else +static inline int of_pci_bridge_init(struct device *dev, struct pci_controller *bridge) +{ + return 0; +} +#endif + #endif /* LINUX_PCI_H */ -- 2.39.2