PCI: Move OF-related PCI functions into PCI core
Following what has been done for other subsystems, move the remaining PCI related code out of drivers/of/ and into drivers/pci/of.c With this, we can kill a few kconfig symbols. Signed-off-by: Rob Herring <robh@kernel.org> [bhelgaas: minor whitespace, comment cleanups] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: Frank Rowand <frowand.list@gmail.com>
This commit is contained in:
Rob Herring
Bjorn Helgaas
parent
1291a0d504
commit
4670d610d5
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@ -10,7 +10,6 @@ menuconfig ARCH_MVEBU
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select ZONE_DMA if ARM_LPAE
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select GPIOLIB
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select PCI_QUIRKS if PCI
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select OF_ADDRESS_PCI
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if ARCH_MVEBU
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@ -62,10 +62,6 @@ config OF_DYNAMIC
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config OF_ADDRESS
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def_bool y
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depends on !SPARC && HAS_IOMEM
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select OF_ADDRESS_PCI if PCI
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config OF_ADDRESS_PCI
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bool
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config OF_IRQ
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def_bool y
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@ -82,18 +78,6 @@ config OF_MDIO
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help
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OpenFirmware MDIO bus (Ethernet PHY) accessors
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config OF_PCI
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def_tristate PCI
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depends on PCI
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help
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OpenFirmware PCI bus accessors
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config OF_PCI_IRQ
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def_tristate PCI
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depends on OF_PCI && OF_IRQ
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help
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OpenFirmware PCI IRQ routing helpers
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config OF_RESERVED_MEM
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depends on OF_EARLY_FLATTREE
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bool
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@ -10,8 +10,6 @@ obj-$(CONFIG_OF_IRQ) += irq.o
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obj-$(CONFIG_OF_NET) += of_net.o
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obj-$(CONFIG_OF_UNITTEST) += unittest.o
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obj-$(CONFIG_OF_MDIO) += of_mdio.o
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obj-$(CONFIG_OF_PCI) += of_pci.o
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obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o
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obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
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obj-$(CONFIG_OF_RESOLVE) += resolver.o
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obj-$(CONFIG_OF_OVERLAY) += overlay.o
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@ -96,7 +96,7 @@ static unsigned int of_bus_default_get_flags(const __be32 *addr)
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return IORESOURCE_MEM;
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}
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#ifdef CONFIG_OF_ADDRESS_PCI
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#ifdef CONFIG_PCI
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/*
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* PCI bus specific translator
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*/
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@ -171,9 +171,7 @@ static int of_bus_pci_translate(__be32 *addr, u64 offset, int na)
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{
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return of_bus_default_translate(addr + 1, offset, na - 1);
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}
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#endif /* CONFIG_OF_ADDRESS_PCI */
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#ifdef CONFIG_PCI
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const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
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unsigned int *flags)
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{
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@ -426,7 +424,7 @@ static unsigned int of_bus_isa_get_flags(const __be32 *addr)
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*/
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static struct of_bus of_busses[] = {
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#ifdef CONFIG_OF_ADDRESS_PCI
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#ifdef CONFIG_PCI
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/* PCI */
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{
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.name = "pci",
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@ -437,7 +435,7 @@ static struct of_bus of_busses[] = {
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.translate = of_bus_pci_translate,
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.get_flags = of_bus_pci_get_flags,
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},
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#endif /* CONFIG_OF_ADDRESS_PCI */
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#endif /* CONFIG_PCI */
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/* ISA */
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{
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.name = "isa",
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@ -1,384 +0,0 @@
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#define pr_fmt(fmt) "OF: PCI: " fmt
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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_device.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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{
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int devfn;
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devfn = of_pci_get_devfn(node);
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if (devfn < 0)
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return 0;
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return devfn == data;
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}
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struct device_node *of_pci_find_child_device(struct device_node *parent,
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unsigned int devfn)
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{
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struct device_node *node, *node2;
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for_each_child_of_node(parent, node) {
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if (__of_pci_pci_compare(node, devfn))
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return node;
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/*
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* Some OFs create a parent node "multifunc-device" as
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* a fake root for all functions of a multi-function
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* device we go down them as well.
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*/
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if (!strcmp(node->name, "multifunc-device")) {
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for_each_child_of_node(node, node2) {
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if (__of_pci_pci_compare(node2, devfn)) {
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of_node_put(node);
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return node2;
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}
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}
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(of_pci_find_child_device);
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/**
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* of_pci_get_devfn() - Get device and function numbers for a device node
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* @np: device node
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*
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* Parses a standard 5-cell PCI resource and returns an 8-bit value that can
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* be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
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* and function numbers respectively. On error a negative error code is
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* returned.
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*/
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int of_pci_get_devfn(struct device_node *np)
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{
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u32 reg[5];
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int error;
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error = of_property_read_u32_array(np, "reg", reg, ARRAY_SIZE(reg));
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if (error)
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return error;
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return (reg[0] >> 8) & 0xff;
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}
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EXPORT_SYMBOL_GPL(of_pci_get_devfn);
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/**
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* of_pci_parse_bus_range() - parse the bus-range property of a PCI device
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* @node: device node
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* @res: address to a struct resource to return the bus-range
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*
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* Returns 0 on success or a negative error-code on failure.
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*/
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int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
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{
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u32 bus_range[2];
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int error;
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error = of_property_read_u32_array(node, "bus-range", bus_range,
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ARRAY_SIZE(bus_range));
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if (error)
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return error;
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res->name = node->name;
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res->start = bus_range[0];
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res->end = bus_range[1];
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res->flags = IORESOURCE_BUS;
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
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/**
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* This function will try to obtain the host bridge domain number by
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* finding a property called "linux,pci-domain" of the given device node.
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*
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* @node: device tree node with the domain information
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*
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* Returns the associated domain number from DT in the range [0-0xffff], or
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* a negative value if the required property is not found.
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*/
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int of_get_pci_domain_nr(struct device_node *node)
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{
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u32 domain;
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int error;
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error = of_property_read_u32(node, "linux,pci-domain", &domain);
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if (error)
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return error;
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return (u16)domain;
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}
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EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
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/**
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* This function will try to find the limitation of link speed by finding
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* a property called "max-link-speed" of the given device node.
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*
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* @node: device tree node with the max link speed information
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*
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* Returns the associated max link speed from DT, or a negative value if the
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* required property is not found or is invalid.
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*/
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int of_pci_get_max_link_speed(struct device_node *node)
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{
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u32 max_link_speed;
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if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
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max_link_speed > 4)
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return -EINVAL;
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return max_link_speed;
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}
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EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
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/**
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* of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
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* is present and valid
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*/
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void of_pci_check_probe_only(void)
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{
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u32 val;
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int ret;
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ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val);
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if (ret) {
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if (ret == -ENODATA || ret == -EOVERFLOW)
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pr_warn("linux,pci-probe-only without valid value, ignoring\n");
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return;
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}
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if (val)
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pci_add_flags(PCI_PROBE_ONLY);
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else
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pci_clear_flags(PCI_PROBE_ONLY);
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pr_info("PROBE_ONLY %sabled\n", val ? "en" : "dis");
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}
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EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
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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_entry *window;
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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("host bridge %pOF ranges:\n", dev);
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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 %pOF, using %pR\n",
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dev, 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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kfree(res);
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continue;
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}
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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 %pOF. Please provide an io_base pointer to save CPU base address\n",
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dev);
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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 %pOF. CPU base address for old range lost!\n",
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dev);
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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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resource_list_for_each_entry(window, resources)
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kfree(window->res);
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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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/**
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* of_pci_map_rid - Translate a requester ID through a downstream mapping.
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* @np: root complex device node.
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* @rid: PCI requester ID to map.
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* @map_name: property name of the map to use.
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* @map_mask_name: optional property name of the mask to use.
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* @target: optional pointer to a target device node.
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* @id_out: optional pointer to receive the translated ID.
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*
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* Given a PCI requester ID, look up the appropriate implementation-defined
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* platform ID and/or the target device which receives transactions on that
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* ID, as per the "iommu-map" and "msi-map" bindings. Either of @target or
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* @id_out may be NULL if only the other is required. If @target points to
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* a non-NULL device node pointer, only entries targeting that node will be
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* matched; if it points to a NULL value, it will receive the device node of
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* the first matching target phandle, with a reference held.
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*
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* Return: 0 on success or a standard error code on failure.
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*/
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int of_pci_map_rid(struct device_node *np, u32 rid,
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const char *map_name, const char *map_mask_name,
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struct device_node **target, u32 *id_out)
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{
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u32 map_mask, masked_rid;
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int map_len;
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const __be32 *map = NULL;
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if (!np || !map_name || (!target && !id_out))
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return -EINVAL;
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map = of_get_property(np, map_name, &map_len);
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if (!map) {
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if (target)
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return -ENODEV;
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/* Otherwise, no map implies no translation */
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*id_out = rid;
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return 0;
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}
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if (!map_len || map_len % (4 * sizeof(*map))) {
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pr_err("%pOF: Error: Bad %s length: %d\n", np,
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map_name, map_len);
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return -EINVAL;
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}
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/* The default is to select all bits. */
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map_mask = 0xffffffff;
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/*
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* Can be overridden by "{iommu,msi}-map-mask" property.
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* If of_property_read_u32() fails, the default is used.
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*/
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if (map_mask_name)
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of_property_read_u32(np, map_mask_name, &map_mask);
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masked_rid = map_mask & rid;
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for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) {
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struct device_node *phandle_node;
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u32 rid_base = be32_to_cpup(map + 0);
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u32 phandle = be32_to_cpup(map + 1);
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u32 out_base = be32_to_cpup(map + 2);
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u32 rid_len = be32_to_cpup(map + 3);
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if (rid_base & ~map_mask) {
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pr_err("%pOF: Invalid %s translation - %s-mask (0x%x) ignores rid-base (0x%x)\n",
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np, map_name, map_name,
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map_mask, rid_base);
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return -EFAULT;
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}
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if (masked_rid < rid_base || masked_rid >= rid_base + rid_len)
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continue;
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phandle_node = of_find_node_by_phandle(phandle);
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if (!phandle_node)
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return -ENODEV;
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|
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if (target) {
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if (*target)
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of_node_put(phandle_node);
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else
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*target = phandle_node;
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if (*target != phandle_node)
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continue;
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}
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if (id_out)
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*id_out = masked_rid - rid_base + out_base;
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pr_debug("%pOF: %s, using mask %08x, rid-base: %08x, out-base: %08x, length: %08x, rid: %08x -> %08x\n",
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np, map_name, map_mask, rid_base, out_base,
|
||||
rid_len, rid, masked_rid - rid_base + out_base);
|
||||
return 0;
|
||||
}
|
||||
|
||||
pr_err("%pOF: Invalid %s translation - no match for rid 0x%x on %pOF\n",
|
||||
np, map_name, rid, target && *target ? *target : NULL);
|
||||
return -EFAULT;
|
||||
}
|
||||
|
|
@ -1,131 +0,0 @@
|
|||
#include <linux/kernel.h>
|
||||
#include <linux/of_pci.h>
|
||||
#include <linux/of_irq.h>
|
||||
#include <linux/export.h>
|
||||
|
||||
/**
|
||||
* of_irq_parse_pci - Resolve the interrupt for a PCI device
|
||||
* @pdev: the device whose interrupt is to be resolved
|
||||
* @out_irq: structure of_irq 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.
|
||||
*/
|
||||
int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq)
|
||||
{
|
||||
struct device_node *dn, *ppnode;
|
||||
struct pci_dev *ppdev;
|
||||
__be32 laddr[3];
|
||||
u8 pin;
|
||||
int rc;
|
||||
|
||||
/* Check if we have a device node, if yes, fallback to standard
|
||||
* device tree parsing
|
||||
*/
|
||||
dn = pci_device_to_OF_node(pdev);
|
||||
if (dn) {
|
||||
rc = of_irq_parse_one(dn, 0, out_irq);
|
||||
if (!rc)
|
||||
return rc;
|
||||
}
|
||||
|
||||
/* Ok, we don't, time to have fun. Let's start by building up an
|
||||
* interrupt spec. we assume #interrupt-cells is 1, which is standard
|
||||
* for PCI. If you do different, then don't use that routine.
|
||||
*/
|
||||
rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
|
||||
if (rc != 0)
|
||||
goto err;
|
||||
/* No pin, exit with no error message. */
|
||||
if (pin == 0)
|
||||
return -ENODEV;
|
||||
|
||||
/* Now we walk up the PCI tree */
|
||||
for (;;) {
|
||||
/* Get the pci_dev of our parent */
|
||||
ppdev = pdev->bus->self;
|
||||
|
||||
/* Ouch, it's a host bridge... */
|
||||
if (ppdev == NULL) {
|
||||
ppnode = pci_bus_to_OF_node(pdev->bus);
|
||||
|
||||
/* No node for host bridge ? give up */
|
||||
if (ppnode == NULL) {
|
||||
rc = -EINVAL;
|
||||
goto err;
|
||||
}
|
||||
} else {
|
||||
/* We found a P2P bridge, check if it has a node */
|
||||
ppnode = pci_device_to_OF_node(ppdev);
|
||||
}
|
||||
|
||||
/* Ok, we have found a parent with a device-node, hand over to
|
||||
* the OF parsing code.
|
||||
* We build a unit address from the linux device to be used for
|
||||
* resolution. Note that we use the linux bus number which may
|
||||
* not match your firmware bus numbering.
|
||||
* Fortunately, in most cases, interrupt-map-mask doesn't
|
||||
* include the bus number as part of the matching.
|
||||
* You should still be careful about that though if you intend
|
||||
* to rely on this function (you ship a firmware that doesn't
|
||||
* create device nodes for all PCI devices).
|
||||
*/
|
||||
if (ppnode)
|
||||
break;
|
||||
|
||||
/* We can only get here if we hit a P2P bridge with no node,
|
||||
* let's do standard swizzling and try again
|
||||
*/
|
||||
pin = pci_swizzle_interrupt_pin(pdev, pin);
|
||||
pdev = ppdev;
|
||||
}
|
||||
|
||||
out_irq->np = ppnode;
|
||||
out_irq->args_count = 1;
|
||||
out_irq->args[0] = pin;
|
||||
laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8));
|
||||
laddr[1] = laddr[2] = cpu_to_be32(0);
|
||||
rc = of_irq_parse_raw(laddr, out_irq);
|
||||
if (rc)
|
||||
goto err;
|
||||
return 0;
|
||||
err:
|
||||
if (rc == -ENOENT) {
|
||||
dev_warn(&pdev->dev,
|
||||
"%s: no interrupt-map found, INTx interrupts not available\n",
|
||||
__func__);
|
||||
pr_warn_once("%s: possibly some PCI slots don't have level triggered interrupts capability\n",
|
||||
__func__);
|
||||
} else {
|
||||
dev_err(&pdev->dev, "%s: failed with rc=%d\n", __func__, rc);
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_irq_parse_pci);
|
||||
|
||||
/**
|
||||
* 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)
|
||||
{
|
||||
struct of_phandle_args oirq;
|
||||
int ret;
|
||||
|
||||
ret = of_irq_parse_pci(dev, &oirq);
|
||||
if (ret)
|
||||
return 0; /* Proper return code 0 == NO_IRQ */
|
||||
|
||||
return irq_create_of_mapping(&oirq);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_irq_parse_and_map_pci);
|
||||
|
||||
515
drivers/pci/of.c
515
drivers/pci/of.c
|
|
@ -8,12 +8,14 @@
|
|||
* as published by the Free Software Foundation; either version
|
||||
* 2 of the License, or (at your option) any later version.
|
||||
*/
|
||||
#define pr_fmt(fmt) "PCI: OF: " fmt
|
||||
|
||||
#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 "pci.h"
|
||||
|
||||
|
|
@ -51,8 +53,9 @@ struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)
|
|||
if (WARN_ON(bus->self || bus->parent))
|
||||
return NULL;
|
||||
|
||||
/* Look for a node pointer in either the intermediary device we
|
||||
* create above the root bus or it's own parent. Normally only
|
||||
/*
|
||||
* Look for a node pointer in either the intermediary device we
|
||||
* create above the root bus or its own parent. Normally only
|
||||
* the later is populated.
|
||||
*/
|
||||
if (bus->bridge->of_node)
|
||||
|
|
@ -88,3 +91,511 @@ struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
|
|||
return NULL;
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
static inline int __of_pci_pci_compare(struct device_node *node,
|
||||
unsigned int data)
|
||||
{
|
||||
int devfn;
|
||||
|
||||
devfn = of_pci_get_devfn(node);
|
||||
if (devfn < 0)
|
||||
return 0;
|
||||
|
||||
return devfn == data;
|
||||
}
|
||||
|
||||
struct device_node *of_pci_find_child_device(struct device_node *parent,
|
||||
unsigned int devfn)
|
||||
{
|
||||
struct device_node *node, *node2;
|
||||
|
||||
for_each_child_of_node(parent, node) {
|
||||
if (__of_pci_pci_compare(node, devfn))
|
||||
return node;
|
||||
/*
|
||||
* Some OFs create a parent node "multifunc-device" as
|
||||
* a fake root for all functions of a multi-function
|
||||
* device we go down them as well.
|
||||
*/
|
||||
if (!strcmp(node->name, "multifunc-device")) {
|
||||
for_each_child_of_node(node, node2) {
|
||||
if (__of_pci_pci_compare(node2, devfn)) {
|
||||
of_node_put(node);
|
||||
return node2;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_pci_find_child_device);
|
||||
|
||||
/**
|
||||
* 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)
|
||||
{
|
||||
u32 reg[5];
|
||||
int error;
|
||||
|
||||
error = of_property_read_u32_array(np, "reg", reg, ARRAY_SIZE(reg));
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
return (reg[0] >> 8) & 0xff;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_pci_get_devfn);
|
||||
|
||||
/**
|
||||
* 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)
|
||||
{
|
||||
u32 bus_range[2];
|
||||
int error;
|
||||
|
||||
error = of_property_read_u32_array(node, "bus-range", bus_range,
|
||||
ARRAY_SIZE(bus_range));
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
res->name = node->name;
|
||||
res->start = bus_range[0];
|
||||
res->end = bus_range[1];
|
||||
res->flags = IORESOURCE_BUS;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
|
||||
|
||||
/**
|
||||
* This function will try to obtain the host bridge domain number by
|
||||
* finding a property called "linux,pci-domain" of the given device node.
|
||||
*
|
||||
* @node: device tree node with the domain information
|
||||
*
|
||||
* 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)
|
||||
{
|
||||
u32 domain;
|
||||
int error;
|
||||
|
||||
error = of_property_read_u32(node, "linux,pci-domain", &domain);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
return (u16)domain;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
|
||||
|
||||
/**
|
||||
* This function will try to find the limitation of link speed by finding
|
||||
* a property called "max-link-speed" of the given device node.
|
||||
*
|
||||
* @node: device tree node with the max link speed information
|
||||
*
|
||||
* 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)
|
||||
{
|
||||
u32 max_link_speed;
|
||||
|
||||
if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
|
||||
max_link_speed > 4)
|
||||
return -EINVAL;
|
||||
|
||||
return max_link_speed;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
|
||||
|
||||
/**
|
||||
* 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)
|
||||
{
|
||||
u32 val;
|
||||
int ret;
|
||||
|
||||
ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val);
|
||||
if (ret) {
|
||||
if (ret == -ENODATA || ret == -EOVERFLOW)
|
||||
pr_warn("linux,pci-probe-only without valid value, ignoring\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if (val)
|
||||
pci_add_flags(PCI_PROBE_ONLY);
|
||||
else
|
||||
pci_clear_flags(PCI_PROBE_ONLY);
|
||||
|
||||
pr_info("PROBE_ONLY %sabled\n", val ? "en" : "dis");
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
|
||||
|
||||
#if defined(CONFIG_OF_ADDRESS)
|
||||
/**
|
||||
* of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
|
||||
* @dev: device node of the host bridge having the range property
|
||||
* @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
|
||||
* @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.
|
||||
*
|
||||
* It is the caller's job to free the @resources list.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
int of_pci_get_host_bridge_resources(struct device_node *dev,
|
||||
unsigned char busno, unsigned char bus_max,
|
||||
struct list_head *resources, resource_size_t *io_base)
|
||||
{
|
||||
struct resource_entry *window;
|
||||
struct resource *res;
|
||||
struct resource *bus_range;
|
||||
struct of_pci_range range;
|
||||
struct of_pci_range_parser parser;
|
||||
char range_type[4];
|
||||
int err;
|
||||
|
||||
if (io_base)
|
||||
*io_base = (resource_size_t)OF_BAD_ADDR;
|
||||
|
||||
bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
|
||||
if (!bus_range)
|
||||
return -ENOMEM;
|
||||
|
||||
pr_info("host bridge %pOF ranges:\n", dev);
|
||||
|
||||
err = of_pci_parse_bus_range(dev, bus_range);
|
||||
if (err) {
|
||||
bus_range->start = busno;
|
||||
bus_range->end = bus_max;
|
||||
bus_range->flags = IORESOURCE_BUS;
|
||||
pr_info(" No bus range found for %pOF, using %pR\n",
|
||||
dev, bus_range);
|
||||
} else {
|
||||
if (bus_range->end > bus_range->start + bus_max)
|
||||
bus_range->end = bus_range->start + bus_max;
|
||||
}
|
||||
pci_add_resource(resources, bus_range);
|
||||
|
||||
/* Check for ranges property */
|
||||
err = of_pci_range_parser_init(&parser, dev);
|
||||
if (err)
|
||||
goto parse_failed;
|
||||
|
||||
pr_debug("Parsing ranges property...\n");
|
||||
for_each_of_pci_range(&parser, &range) {
|
||||
/* Read next ranges element */
|
||||
if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
|
||||
snprintf(range_type, 4, " IO");
|
||||
else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
|
||||
snprintf(range_type, 4, "MEM");
|
||||
else
|
||||
snprintf(range_type, 4, "err");
|
||||
pr_info(" %s %#010llx..%#010llx -> %#010llx\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;
|
||||
|
||||
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
|
||||
if (!res) {
|
||||
err = -ENOMEM;
|
||||
goto parse_failed;
|
||||
}
|
||||
|
||||
err = of_pci_range_to_resource(&range, dev, res);
|
||||
if (err) {
|
||||
kfree(res);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (resource_type(res) == IORESOURCE_IO) {
|
||||
if (!io_base) {
|
||||
pr_err("I/O range found for %pOF. Please provide an io_base pointer to save CPU base address\n",
|
||||
dev);
|
||||
err = -EINVAL;
|
||||
goto conversion_failed;
|
||||
}
|
||||
if (*io_base != (resource_size_t)OF_BAD_ADDR)
|
||||
pr_warn("More than one I/O resource converted for %pOF. CPU base address for old range lost!\n",
|
||||
dev);
|
||||
*io_base = range.cpu_addr;
|
||||
}
|
||||
|
||||
pci_add_resource_offset(resources, res, res->start - range.pci_addr);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
conversion_failed:
|
||||
kfree(res);
|
||||
parse_failed:
|
||||
resource_list_for_each_entry(window, resources)
|
||||
kfree(window->res);
|
||||
pci_free_resource_list(resources);
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
|
||||
#endif /* CONFIG_OF_ADDRESS */
|
||||
|
||||
/**
|
||||
* of_pci_map_rid - Translate a requester ID through a downstream mapping.
|
||||
* @np: root complex device node.
|
||||
* @rid: PCI requester ID to map.
|
||||
* @map_name: property name of the map to use.
|
||||
* @map_mask_name: optional property name of the mask to use.
|
||||
* @target: optional pointer to a target device node.
|
||||
* @id_out: optional pointer to receive the translated ID.
|
||||
*
|
||||
* Given a PCI requester ID, look up the appropriate implementation-defined
|
||||
* platform ID and/or the target device which receives transactions on that
|
||||
* ID, as per the "iommu-map" and "msi-map" bindings. Either of @target or
|
||||
* @id_out may be NULL if only the other is required. If @target points to
|
||||
* a non-NULL device node pointer, only entries targeting that node will be
|
||||
* matched; if it points to a NULL value, it will receive the device node of
|
||||
* the first matching target phandle, with a reference held.
|
||||
*
|
||||
* Return: 0 on success or a standard error code on failure.
|
||||
*/
|
||||
int of_pci_map_rid(struct device_node *np, u32 rid,
|
||||
const char *map_name, const char *map_mask_name,
|
||||
struct device_node **target, u32 *id_out)
|
||||
{
|
||||
u32 map_mask, masked_rid;
|
||||
int map_len;
|
||||
const __be32 *map = NULL;
|
||||
|
||||
if (!np || !map_name || (!target && !id_out))
|
||||
return -EINVAL;
|
||||
|
||||
map = of_get_property(np, map_name, &map_len);
|
||||
if (!map) {
|
||||
if (target)
|
||||
return -ENODEV;
|
||||
/* Otherwise, no map implies no translation */
|
||||
*id_out = rid;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!map_len || map_len % (4 * sizeof(*map))) {
|
||||
pr_err("%pOF: Error: Bad %s length: %d\n", np,
|
||||
map_name, map_len);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* The default is to select all bits. */
|
||||
map_mask = 0xffffffff;
|
||||
|
||||
/*
|
||||
* Can be overridden by "{iommu,msi}-map-mask" property.
|
||||
* If of_property_read_u32() fails, the default is used.
|
||||
*/
|
||||
if (map_mask_name)
|
||||
of_property_read_u32(np, map_mask_name, &map_mask);
|
||||
|
||||
masked_rid = map_mask & rid;
|
||||
for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) {
|
||||
struct device_node *phandle_node;
|
||||
u32 rid_base = be32_to_cpup(map + 0);
|
||||
u32 phandle = be32_to_cpup(map + 1);
|
||||
u32 out_base = be32_to_cpup(map + 2);
|
||||
u32 rid_len = be32_to_cpup(map + 3);
|
||||
|
||||
if (rid_base & ~map_mask) {
|
||||
pr_err("%pOF: Invalid %s translation - %s-mask (0x%x) ignores rid-base (0x%x)\n",
|
||||
np, map_name, map_name,
|
||||
map_mask, rid_base);
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
if (masked_rid < rid_base || masked_rid >= rid_base + rid_len)
|
||||
continue;
|
||||
|
||||
phandle_node = of_find_node_by_phandle(phandle);
|
||||
if (!phandle_node)
|
||||
return -ENODEV;
|
||||
|
||||
if (target) {
|
||||
if (*target)
|
||||
of_node_put(phandle_node);
|
||||
else
|
||||
*target = phandle_node;
|
||||
|
||||
if (*target != phandle_node)
|
||||
continue;
|
||||
}
|
||||
|
||||
if (id_out)
|
||||
*id_out = masked_rid - rid_base + out_base;
|
||||
|
||||
pr_debug("%pOF: %s, using mask %08x, rid-base: %08x, out-base: %08x, length: %08x, rid: %08x -> %08x\n",
|
||||
np, map_name, map_mask, rid_base, out_base,
|
||||
rid_len, rid, masked_rid - rid_base + out_base);
|
||||
return 0;
|
||||
}
|
||||
|
||||
pr_err("%pOF: Invalid %s translation - no match for rid 0x%x on %pOF\n",
|
||||
np, map_name, rid, target && *target ? *target : NULL);
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
#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_irq 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.
|
||||
*/
|
||||
int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq)
|
||||
{
|
||||
struct device_node *dn, *ppnode;
|
||||
struct pci_dev *ppdev;
|
||||
__be32 laddr[3];
|
||||
u8 pin;
|
||||
int rc;
|
||||
|
||||
/*
|
||||
* Check if we have a device node, if yes, fallback to standard
|
||||
* device tree parsing
|
||||
*/
|
||||
dn = pci_device_to_OF_node(pdev);
|
||||
if (dn) {
|
||||
rc = of_irq_parse_one(dn, 0, out_irq);
|
||||
if (!rc)
|
||||
return rc;
|
||||
}
|
||||
|
||||
/*
|
||||
* Ok, we don't, time to have fun. Let's start by building up an
|
||||
* interrupt spec. we assume #interrupt-cells is 1, which is standard
|
||||
* for PCI. If you do different, then don't use that routine.
|
||||
*/
|
||||
rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
|
||||
if (rc != 0)
|
||||
goto err;
|
||||
/* No pin, exit with no error message. */
|
||||
if (pin == 0)
|
||||
return -ENODEV;
|
||||
|
||||
/* Now we walk up the PCI tree */
|
||||
for (;;) {
|
||||
/* Get the pci_dev of our parent */
|
||||
ppdev = pdev->bus->self;
|
||||
|
||||
/* Ouch, it's a host bridge... */
|
||||
if (ppdev == NULL) {
|
||||
ppnode = pci_bus_to_OF_node(pdev->bus);
|
||||
|
||||
/* No node for host bridge ? give up */
|
||||
if (ppnode == NULL) {
|
||||
rc = -EINVAL;
|
||||
goto err;
|
||||
}
|
||||
} else {
|
||||
/* We found a P2P bridge, check if it has a node */
|
||||
ppnode = pci_device_to_OF_node(ppdev);
|
||||
}
|
||||
|
||||
/*
|
||||
* Ok, we have found a parent with a device-node, hand over to
|
||||
* the OF parsing code.
|
||||
* We build a unit address from the linux device to be used for
|
||||
* resolution. Note that we use the linux bus number which may
|
||||
* not match your firmware bus numbering.
|
||||
* Fortunately, in most cases, interrupt-map-mask doesn't
|
||||
* include the bus number as part of the matching.
|
||||
* You should still be careful about that though if you intend
|
||||
* to rely on this function (you ship a firmware that doesn't
|
||||
* create device nodes for all PCI devices).
|
||||
*/
|
||||
if (ppnode)
|
||||
break;
|
||||
|
||||
/*
|
||||
* We can only get here if we hit a P2P bridge with no node;
|
||||
* let's do standard swizzling and try again
|
||||
*/
|
||||
pin = pci_swizzle_interrupt_pin(pdev, pin);
|
||||
pdev = ppdev;
|
||||
}
|
||||
|
||||
out_irq->np = ppnode;
|
||||
out_irq->args_count = 1;
|
||||
out_irq->args[0] = pin;
|
||||
laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8));
|
||||
laddr[1] = laddr[2] = cpu_to_be32(0);
|
||||
rc = of_irq_parse_raw(laddr, out_irq);
|
||||
if (rc)
|
||||
goto err;
|
||||
return 0;
|
||||
err:
|
||||
if (rc == -ENOENT) {
|
||||
dev_warn(&pdev->dev,
|
||||
"%s: no interrupt-map found, INTx interrupts not available\n",
|
||||
__func__);
|
||||
pr_warn_once("%s: possibly some PCI slots don't have level triggered interrupts capability\n",
|
||||
__func__);
|
||||
} else {
|
||||
dev_err(&pdev->dev, "%s: failed with rc=%d\n", __func__, rc);
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_irq_parse_pci);
|
||||
|
||||
/**
|
||||
* 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)
|
||||
{
|
||||
struct of_phandle_args oirq;
|
||||
int ret;
|
||||
|
||||
ret = of_irq_parse_pci(dev, &oirq);
|
||||
if (ret)
|
||||
return 0; /* Proper return code 0 == NO_IRQ */
|
||||
|
||||
return irq_create_of_mapping(&oirq);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_irq_parse_and_map_pci);
|
||||
#endif /* CONFIG_OF_IRQ */
|
||||
|
|
|
|||
|
|
@ -9,7 +9,7 @@ struct pci_dev;
|
|||
struct of_phandle_args;
|
||||
struct device_node;
|
||||
|
||||
#ifdef CONFIG_OF_PCI
|
||||
#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_PCI)
|
||||
int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq);
|
||||
struct device_node *of_pci_find_child_device(struct device_node *parent,
|
||||
unsigned int devfn);
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user