// SPDX-License-Identifier: GPL-2.0+ /* * PCI <-> OF mapping helpers * * Copyright 2011 IBM Corp. */ #define pr_fmt(fmt) … #include <linux/cleanup.h> #include <linux/irqdomain.h> #include <linux/kernel.h> #include <linux/pci.h> #include <linux/of.h> #include <linux/of_irq.h> #include <linux/of_address.h> #include <linux/of_pci.h> #include <linux/platform_device.h> #include "pci.h" #ifdef CONFIG_PCI /** * pci_set_of_node - Find and set device's DT device_node * @dev: the PCI device structure to fill * * Returns 0 on success with of_node set or when no device is described in the * DT. Returns -ENODEV if the device is present, but disabled in the DT. */ int pci_set_of_node(struct pci_dev *dev) { … } void pci_release_of_node(struct pci_dev *dev) { … } void pci_set_bus_of_node(struct pci_bus *bus) { … } void pci_release_bus_of_node(struct pci_bus *bus) { … } struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus) { … } struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus) { … } bool pci_host_of_has_msi_map(struct device *dev) { … } static inline int __of_pci_pci_compare(struct device_node *node, unsigned int data) { … } struct device_node *of_pci_find_child_device(struct device_node *parent, unsigned int devfn) { … } EXPORT_SYMBOL_GPL(…); /** * of_pci_get_devfn() - Get device and function numbers for a device node * @np: device node * * Parses a standard 5-cell PCI resource and returns an 8-bit value that can * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device * and function numbers respectively. On error a negative error code is * returned. */ int of_pci_get_devfn(struct device_node *np) { … } EXPORT_SYMBOL_GPL(…); /** * of_pci_parse_bus_range() - parse the bus-range property of a PCI device * @node: device node * @res: address to a struct resource to return the bus-range * * Returns 0 on success or a negative error-code on failure. */ int of_pci_parse_bus_range(struct device_node *node, struct resource *res) { … } EXPORT_SYMBOL_GPL(…); /** * of_get_pci_domain_nr - Find the host bridge domain number * of the given device node. * @node: Device tree node with the domain information. * * This function will try to obtain the host bridge domain number by finding * a property called "linux,pci-domain" of the given device node. * * Return: * * > 0 - On success, an associated domain number. * * -EINVAL - The property "linux,pci-domain" does not exist. * * -ENODATA - The linux,pci-domain" property does not have value. * * -EOVERFLOW - Invalid "linux,pci-domain" property value. * * Returns the associated domain number from DT in the range [0-0xffff], or * a negative value if the required property is not found. */ int of_get_pci_domain_nr(struct device_node *node) { … } EXPORT_SYMBOL_GPL(…); /** * of_pci_preserve_config - Return true if the boot configuration needs to * be preserved * @node: Device tree node. * * Look for "linux,pci-probe-only" property for a given PCI controller's * node and return true if found. Also look in the chosen node if the * property is not found in the given controller's node. Having this * property ensures that the kernel doesn't reconfigure the BARs and bridge * windows that are already done by the platform firmware. * * Return: true if the property exists; false otherwise. */ bool of_pci_preserve_config(struct device_node *node) { … } /** * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only * is present and valid */ void of_pci_check_probe_only(void) { … } EXPORT_SYMBOL_GPL(…); /** * devm_of_pci_get_host_bridge_resources() - Resource-managed parsing of PCI * host bridge resources from DT * @dev: host bridge device * @busno: bus number associated with the bridge root bus * @bus_max: maximum number of buses for this bridge * @resources: list where the range of resources will be added after DT parsing * @ib_resources: list where the range of inbound resources (with addresses * from 'dma-ranges') will be added after DT parsing * @io_base: pointer to a variable that will contain on return the physical * address for the start of the I/O range. Can be NULL if the caller doesn't * expect I/O ranges to be present in the device tree. * * 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 devm_of_pci_get_host_bridge_resources(struct device *dev, unsigned char busno, unsigned char bus_max, struct list_head *resources, struct list_head *ib_resources, resource_size_t *io_base) { … } #if IS_ENABLED(CONFIG_OF_IRQ) /** * of_irq_parse_pci - Resolve the interrupt for a PCI device * @pdev: the device whose interrupt is to be resolved * @out_irq: structure of_phandle_args filled by this function * * This function resolves the PCI interrupt for a given PCI device. If a * device-node exists for a given pci_dev, it will use normal OF tree * walking. If not, it will implement standard swizzling and walk up the * PCI tree until an device-node is found, at which point it will finish * resolving using the OF tree walking. */ static int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq) { … } /** * of_irq_parse_and_map_pci() - Decode a PCI IRQ from the device tree and map to a VIRQ * @dev: The PCI device needing an IRQ * @slot: PCI slot number; passed when used as map_irq callback. Unused * @pin: PCI IRQ pin number; passed when used as map_irq callback. Unused * * @slot and @pin are unused, but included in the function so that this * function can be used directly as the map_irq callback to * pci_assign_irq() and struct pci_host_bridge.map_irq pointer */ int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin) { … } EXPORT_SYMBOL_GPL(…); #endif /* CONFIG_OF_IRQ */ static int pci_parse_request_of_pci_ranges(struct device *dev, struct pci_host_bridge *bridge) { … } int devm_of_pci_bridge_init(struct device *dev, struct pci_host_bridge *bridge) { … } #ifdef CONFIG_PCI_DYNAMIC_OF_NODES void of_pci_remove_node(struct pci_dev *pdev) { … } void of_pci_make_dev_node(struct pci_dev *pdev) { … } #endif #endif /* CONFIG_PCI */ /** * of_pci_get_max_link_speed - Find the maximum link speed of the given device node. * @node: Device tree node with the maximum link speed information. * * This function will try to find the limitation of link speed by finding * a property called "max-link-speed" of the given device node. * * Return: * * > 0 - On success, a maximum link speed. * * -EINVAL - Invalid "max-link-speed" property value, or failure to access * the property of the device tree node. * * Returns the associated max link speed from DT, or a negative value if the * required property is not found or is invalid. */ int of_pci_get_max_link_speed(struct device_node *node) { … } EXPORT_SYMBOL_GPL(…); /** * of_pci_get_slot_power_limit - Parses the "slot-power-limit-milliwatt" * property. * * @node: device tree node with the slot power limit information * @slot_power_limit_value: pointer where the value should be stored in PCIe * Slot Capabilities Register format * @slot_power_limit_scale: pointer where the scale should be stored in PCIe * Slot Capabilities Register format * * Returns the slot power limit in milliwatts and if @slot_power_limit_value * and @slot_power_limit_scale pointers are non-NULL, fills in the value and * scale in format used by PCIe Slot Capabilities Register. * * If the property is not found or is invalid, returns 0. */ u32 of_pci_get_slot_power_limit(struct device_node *node, u8 *slot_power_limit_value, u8 *slot_power_limit_scale) { … } EXPORT_SYMBOL_GPL(…);
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