1 #include <linux/kernel.h>
2 #include <linux/export.h>
4 #include <linux/of_pci.h>
6 static inline int __of_pci_pci_compare(struct device_node *node,
11 devfn = of_pci_get_devfn(node);
18 struct device_node *of_pci_find_child_device(struct device_node *parent,
21 struct device_node *node, *node2;
23 for_each_child_of_node(parent, node) {
24 if (__of_pci_pci_compare(node, devfn))
27 * Some OFs create a parent node "multifunc-device" as
28 * a fake root for all functions of a multi-function
29 * device we go down them as well.
31 if (!strcmp(node->name, "multifunc-device")) {
32 for_each_child_of_node(node, node2) {
33 if (__of_pci_pci_compare(node2, devfn)) {
42 EXPORT_SYMBOL_GPL(of_pci_find_child_device);
45 * of_pci_get_devfn() - Get device and function numbers for a device node
48 * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
49 * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
50 * and function numbers respectively. On error a negative error code is
53 int of_pci_get_devfn(struct device_node *np)
58 reg = of_get_property(np, "reg", &size);
60 if (!reg || size < 5 * sizeof(__be32))
63 return (be32_to_cpup(reg) >> 8) & 0xff;
65 EXPORT_SYMBOL_GPL(of_pci_get_devfn);
68 * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
70 * @res: address to a struct resource to return the bus-range
72 * Returns 0 on success or a negative error-code on failure.
74 int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
79 values = of_get_property(node, "bus-range", &len);
80 if (!values || len < sizeof(*values) * 2)
83 res->name = node->name;
84 res->start = be32_to_cpup(values++);
85 res->end = be32_to_cpup(values);
86 res->flags = IORESOURCE_BUS;
90 EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
94 static LIST_HEAD(of_pci_msi_chip_list);
95 static DEFINE_MUTEX(of_pci_msi_chip_mutex);
97 int of_pci_msi_chip_add(struct msi_chip *chip)
99 if (!of_property_read_bool(chip->of_node, "msi-controller"))
102 mutex_lock(&of_pci_msi_chip_mutex);
103 list_add(&chip->list, &of_pci_msi_chip_list);
104 mutex_unlock(&of_pci_msi_chip_mutex);
108 EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
110 void of_pci_msi_chip_remove(struct msi_chip *chip)
112 mutex_lock(&of_pci_msi_chip_mutex);
113 list_del(&chip->list);
114 mutex_unlock(&of_pci_msi_chip_mutex);
116 EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
118 struct msi_chip *of_pci_find_msi_chip_by_node(struct device_node *of_node)
122 mutex_lock(&of_pci_msi_chip_mutex);
123 list_for_each_entry(c, &of_pci_msi_chip_list, list) {
124 if (c->of_node == of_node) {
125 mutex_unlock(&of_pci_msi_chip_mutex);
129 mutex_unlock(&of_pci_msi_chip_mutex);
133 EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
135 #endif /* CONFIG_PCI_MSI */