of/pci: Add support for parsing PCI host bridge resources from DT
Provide a function to parse the PCI DT ranges that can be used to create a pci_host_bridge structure together with its associated bus. Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> [make io_base parameter optional] Signed-off-by: Robert Richter <rrichter@cavium.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Arnd Bergmann <arnd@arndb.de> CC: Grant Likely <grant.likely@linaro.org> CC: Rob Herring <robh+dt@kernel.org> CC: Catalin Marinas <catalin.marinas@arm.com>
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@ -1,7 +1,9 @@
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/slab.h>
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static inline int __of_pci_pci_compare(struct device_node *node,
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unsigned int data)
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@ -114,6 +116,121 @@ int of_get_pci_domain_nr(struct device_node *node)
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}
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EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
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#if defined(CONFIG_OF_ADDRESS)
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/**
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* of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
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* @dev: device node of the host bridge having the range property
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* @busno: bus number associated with the bridge root bus
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* @bus_max: maximum number of buses for this bridge
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* @resources: list where the range of resources will be added after DT parsing
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* @io_base: pointer to a variable that will contain on return the physical
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* address for the start of the I/O range. Can be NULL if the caller doesn't
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* expect IO ranges to be present in the device tree.
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*
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* It is the caller's job to free the @resources list.
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*
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* This function will parse the "ranges" property of a PCI host bridge device
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* node and setup the resource mapping based on its content. It is expected
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* that the property conforms with the Power ePAPR document.
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*
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* It returns zero if the range parsing has been successful or a standard error
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* value if it failed.
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*/
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int of_pci_get_host_bridge_resources(struct device_node *dev,
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unsigned char busno, unsigned char bus_max,
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struct list_head *resources, resource_size_t *io_base)
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{
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struct resource *res;
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struct resource *bus_range;
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struct of_pci_range range;
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struct of_pci_range_parser parser;
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char range_type[4];
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int err;
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if (io_base)
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*io_base = (resource_size_t)OF_BAD_ADDR;
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bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
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if (!bus_range)
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return -ENOMEM;
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pr_info("PCI host bridge %s ranges:\n", dev->full_name);
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err = of_pci_parse_bus_range(dev, bus_range);
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if (err) {
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bus_range->start = busno;
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bus_range->end = bus_max;
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bus_range->flags = IORESOURCE_BUS;
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pr_info(" No bus range found for %s, using %pR\n",
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dev->full_name, bus_range);
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} else {
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if (bus_range->end > bus_range->start + bus_max)
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bus_range->end = bus_range->start + bus_max;
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}
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pci_add_resource(resources, bus_range);
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/* Check for ranges property */
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err = of_pci_range_parser_init(&parser, dev);
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if (err)
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goto parse_failed;
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pr_debug("Parsing ranges property...\n");
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for_each_of_pci_range(&parser, &range) {
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/* Read next ranges element */
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if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
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snprintf(range_type, 4, " IO");
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else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
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snprintf(range_type, 4, "MEM");
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else
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snprintf(range_type, 4, "err");
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pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type,
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range.cpu_addr, range.cpu_addr + range.size - 1,
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range.pci_addr);
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/*
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* If we failed translation or got a zero-sized region
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* then skip this range
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*/
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if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
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continue;
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res = kzalloc(sizeof(struct resource), GFP_KERNEL);
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if (!res) {
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err = -ENOMEM;
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goto parse_failed;
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}
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err = of_pci_range_to_resource(&range, dev, res);
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if (err)
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goto conversion_failed;
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if (resource_type(res) == IORESOURCE_IO) {
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if (!io_base) {
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pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
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dev->full_name);
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err = -EINVAL;
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goto conversion_failed;
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}
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if (*io_base != (resource_size_t)OF_BAD_ADDR)
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pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
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dev->full_name);
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*io_base = range.cpu_addr;
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}
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pci_add_resource_offset(resources, res, res->start - range.pci_addr);
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}
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return 0;
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conversion_failed:
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kfree(res);
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parse_failed:
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pci_free_resource_list(resources);
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return err;
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}
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EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
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#endif /* CONFIG_OF_ADDRESS */
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#ifdef CONFIG_PCI_MSI
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static LIST_HEAD(of_pci_msi_chip_list);
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@ -52,6 +52,12 @@ of_get_pci_domain_nr(struct device_node *node)
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}
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#endif
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#if defined(CONFIG_OF_ADDRESS)
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int of_pci_get_host_bridge_resources(struct device_node *dev,
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unsigned char busno, unsigned char bus_max,
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struct list_head *resources, resource_size_t *io_base);
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#endif
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#if defined(CONFIG_OF) && defined(CONFIG_PCI_MSI)
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int of_pci_msi_chip_add(struct msi_chip *chip);
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void of_pci_msi_chip_remove(struct msi_chip *chip);
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