0d5a6db3aa
This commit adds a very basic registry of msi_chip structures, so that an IRQ controller driver can register an msi_chip, and a PCIe host controller can find it, based on a 'struct device_node'. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Jason Cooper <jason@lakedaemon.net>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
#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_pci.h>
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#include <asm/prom.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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unsigned int size;
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const __be32 *reg;
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reg = of_get_property(np, "reg", &size);
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if (!reg || size < 5 * sizeof(__be32))
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return -EINVAL;
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return (be32_to_cpup(reg) >> 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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const __be32 *values;
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int len;
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values = of_get_property(node, "bus-range", &len);
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if (!values || len < sizeof(*values) * 2)
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return -EINVAL;
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res->name = node->name;
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res->start = be32_to_cpup(values++);
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res->end = be32_to_cpup(values);
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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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#ifdef CONFIG_PCI_MSI
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static LIST_HEAD(of_pci_msi_chip_list);
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static DEFINE_MUTEX(of_pci_msi_chip_mutex);
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int of_pci_msi_chip_add(struct msi_chip *chip)
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{
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if (!of_property_read_bool(chip->of_node, "msi-controller"))
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return -EINVAL;
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mutex_lock(&of_pci_msi_chip_mutex);
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list_add(&chip->list, &of_pci_msi_chip_list);
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mutex_unlock(&of_pci_msi_chip_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
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void of_pci_msi_chip_remove(struct msi_chip *chip)
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{
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mutex_lock(&of_pci_msi_chip_mutex);
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list_del(&chip->list);
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mutex_unlock(&of_pci_msi_chip_mutex);
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}
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EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
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struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node)
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{
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struct msi_chip *c;
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mutex_lock(&of_pci_msi_chip_mutex);
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list_for_each_entry(c, &of_pci_msi_chip_list, list) {
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if (c->of_node == of_node) {
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mutex_unlock(&of_pci_msi_chip_mutex);
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return c;
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}
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}
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mutex_unlock(&of_pci_msi_chip_mutex);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
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#endif /* CONFIG_PCI_MSI */
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