1 #include <linux/kernel.h>
2 #include <linux/export.h>
4 #include <linux/of_address.h>
5 #include <linux/of_pci.h>
6 #include <linux/slab.h>
8 static inline int __of_pci_pci_compare(struct device_node *node,
13 devfn = of_pci_get_devfn(node);
20 struct device_node *of_pci_find_child_device(struct device_node *parent,
23 struct device_node *node, *node2;
25 for_each_child_of_node(parent, node) {
26 if (__of_pci_pci_compare(node, devfn))
29 * Some OFs create a parent node "multifunc-device" as
30 * a fake root for all functions of a multi-function
31 * device we go down them as well.
33 if (!strcmp(node->name, "multifunc-device")) {
34 for_each_child_of_node(node, node2) {
35 if (__of_pci_pci_compare(node2, devfn)) {
44 EXPORT_SYMBOL_GPL(of_pci_find_child_device);
47 * of_pci_get_devfn() - Get device and function numbers for a device node
50 * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
51 * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
52 * and function numbers respectively. On error a negative error code is
55 int of_pci_get_devfn(struct device_node *np)
60 reg = of_get_property(np, "reg", &size);
62 if (!reg || size < 5 * sizeof(__be32))
65 return (be32_to_cpup(reg) >> 8) & 0xff;
67 EXPORT_SYMBOL_GPL(of_pci_get_devfn);
70 * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
72 * @res: address to a struct resource to return the bus-range
74 * Returns 0 on success or a negative error-code on failure.
76 int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
81 values = of_get_property(node, "bus-range", &len);
82 if (!values || len < sizeof(*values) * 2)
85 res->name = node->name;
86 res->start = be32_to_cpup(values++);
87 res->end = be32_to_cpup(values);
88 res->flags = IORESOURCE_BUS;
92 EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
95 * This function will try to obtain the host bridge domain number by
96 * finding a property called "linux,pci-domain" of the given device node.
98 * @node: device tree node with the domain information
100 * Returns the associated domain number from DT in the range [0-0xffff], or
101 * a negative value if the required property is not found.
103 int of_get_pci_domain_nr(struct device_node *node)
109 value = of_get_property(node, "linux,pci-domain", &len);
110 if (!value || len < sizeof(*value))
113 domain = (u16)be32_to_cpup(value);
117 EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
119 #if defined(CONFIG_OF_ADDRESS)
121 * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
122 * @dev: device node of the host bridge having the range property
123 * @busno: bus number associated with the bridge root bus
124 * @bus_max: maximum number of buses for this bridge
125 * @resources: list where the range of resources will be added after DT parsing
126 * @io_base: pointer to a variable that will contain on return the physical
127 * address for the start of the I/O range. Can be NULL if the caller doesn't
128 * expect IO ranges to be present in the device tree.
130 * It is the caller's job to free the @resources list.
132 * This function will parse the "ranges" property of a PCI host bridge device
133 * node and setup the resource mapping based on its content. It is expected
134 * that the property conforms with the Power ePAPR document.
136 * It returns zero if the range parsing has been successful or a standard error
137 * value if it failed.
139 int of_pci_get_host_bridge_resources(struct device_node *dev,
140 unsigned char busno, unsigned char bus_max,
141 struct list_head *resources, resource_size_t *io_base)
143 struct pci_host_bridge_window *window;
144 struct resource *res;
145 struct resource *bus_range;
146 struct of_pci_range range;
147 struct of_pci_range_parser parser;
152 *io_base = (resource_size_t)OF_BAD_ADDR;
154 bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
158 pr_info("PCI host bridge %s ranges:\n", dev->full_name);
160 err = of_pci_parse_bus_range(dev, bus_range);
162 bus_range->start = busno;
163 bus_range->end = bus_max;
164 bus_range->flags = IORESOURCE_BUS;
165 pr_info(" No bus range found for %s, using %pR\n",
166 dev->full_name, bus_range);
168 if (bus_range->end > bus_range->start + bus_max)
169 bus_range->end = bus_range->start + bus_max;
171 pci_add_resource(resources, bus_range);
173 /* Check for ranges property */
174 err = of_pci_range_parser_init(&parser, dev);
178 pr_debug("Parsing ranges property...\n");
179 for_each_of_pci_range(&parser, &range) {
180 /* Read next ranges element */
181 if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
182 snprintf(range_type, 4, " IO");
183 else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
184 snprintf(range_type, 4, "MEM");
186 snprintf(range_type, 4, "err");
187 pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type,
188 range.cpu_addr, range.cpu_addr + range.size - 1,
192 * If we failed translation or got a zero-sized region
193 * then skip this range
195 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
198 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
204 err = of_pci_range_to_resource(&range, dev, res);
206 goto conversion_failed;
208 if (resource_type(res) == IORESOURCE_IO) {
210 pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
213 goto conversion_failed;
215 if (*io_base != (resource_size_t)OF_BAD_ADDR)
216 pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
218 *io_base = range.cpu_addr;
221 pci_add_resource_offset(resources, res, res->start - range.pci_addr);
229 list_for_each_entry(window, resources, list)
231 pci_free_resource_list(resources);
235 EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
236 #endif /* CONFIG_OF_ADDRESS */
238 #ifdef CONFIG_PCI_MSI
240 static LIST_HEAD(of_pci_msi_chip_list);
241 static DEFINE_MUTEX(of_pci_msi_chip_mutex);
243 int of_pci_msi_chip_add(struct msi_controller *chip)
245 if (!of_property_read_bool(chip->of_node, "msi-controller"))
248 mutex_lock(&of_pci_msi_chip_mutex);
249 list_add(&chip->list, &of_pci_msi_chip_list);
250 mutex_unlock(&of_pci_msi_chip_mutex);
254 EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
256 void of_pci_msi_chip_remove(struct msi_controller *chip)
258 mutex_lock(&of_pci_msi_chip_mutex);
259 list_del(&chip->list);
260 mutex_unlock(&of_pci_msi_chip_mutex);
262 EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
264 struct msi_controller *of_pci_find_msi_chip_by_node(struct device_node *of_node)
266 struct msi_controller *c;
268 mutex_lock(&of_pci_msi_chip_mutex);
269 list_for_each_entry(c, &of_pci_msi_chip_list, list) {
270 if (c->of_node == of_node) {
271 mutex_unlock(&of_pci_msi_chip_mutex);
275 mutex_unlock(&of_pci_msi_chip_mutex);
279 EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
281 #endif /* CONFIG_PCI_MSI */