1 #include <linux/kernel.h>
2 #include <linux/export.h>
4 #include <linux/of_address.h>
5 #include <linux/of_device.h>
6 #include <linux/of_pci.h>
7 #include <linux/slab.h>
8 #include <asm-generic/pci-bridge.h>
10 static inline int __of_pci_pci_compare(struct device_node *node,
15 devfn = of_pci_get_devfn(node);
22 struct device_node *of_pci_find_child_device(struct device_node *parent,
25 struct device_node *node, *node2;
27 for_each_child_of_node(parent, node) {
28 if (__of_pci_pci_compare(node, devfn))
31 * Some OFs create a parent node "multifunc-device" as
32 * a fake root for all functions of a multi-function
33 * device we go down them as well.
35 if (!strcmp(node->name, "multifunc-device")) {
36 for_each_child_of_node(node, node2) {
37 if (__of_pci_pci_compare(node2, devfn)) {
46 EXPORT_SYMBOL_GPL(of_pci_find_child_device);
49 * of_pci_get_devfn() - Get device and function numbers for a device node
52 * Parses a standard 5-cell PCI resource and returns an 8-bit value that can
53 * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device
54 * and function numbers respectively. On error a negative error code is
57 int of_pci_get_devfn(struct device_node *np)
62 reg = of_get_property(np, "reg", &size);
64 if (!reg || size < 5 * sizeof(__be32))
67 return (be32_to_cpup(reg) >> 8) & 0xff;
69 EXPORT_SYMBOL_GPL(of_pci_get_devfn);
72 * of_pci_parse_bus_range() - parse the bus-range property of a PCI device
74 * @res: address to a struct resource to return the bus-range
76 * Returns 0 on success or a negative error-code on failure.
78 int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
83 values = of_get_property(node, "bus-range", &len);
84 if (!values || len < sizeof(*values) * 2)
87 res->name = node->name;
88 res->start = be32_to_cpup(values++);
89 res->end = be32_to_cpup(values);
90 res->flags = IORESOURCE_BUS;
94 EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
97 * This function will try to obtain the host bridge domain number by
98 * finding a property called "linux,pci-domain" of the given device node.
100 * @node: device tree node with the domain information
102 * Returns the associated domain number from DT in the range [0-0xffff], or
103 * a negative value if the required property is not found.
105 int of_get_pci_domain_nr(struct device_node *node)
111 value = of_get_property(node, "linux,pci-domain", &len);
112 if (!value || len < sizeof(*value))
115 domain = (u16)be32_to_cpup(value);
119 EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
122 * This function will try to find the limitation of link speed by finding
123 * a property called "max-link-speed" of the given device node.
125 * @node: device tree node with the max link speed information
127 * Returns the associated max link speed from DT, or a negative value if the
128 * required property is not found or is invalid.
130 int of_pci_get_max_link_speed(struct device_node *node)
134 if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
138 return max_link_speed;
140 EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
143 * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
144 * is present and valid
146 void of_pci_check_probe_only(void)
151 ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val);
153 if (ret == -ENODATA || ret == -EOVERFLOW)
154 pr_warn("linux,pci-probe-only without valid value, ignoring\n");
159 pci_add_flags(PCI_PROBE_ONLY);
161 pci_clear_flags(PCI_PROBE_ONLY);
163 pr_info("PCI: PROBE_ONLY %sabled\n", val ? "en" : "dis");
165 EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
167 #if defined(CONFIG_OF_ADDRESS)
169 * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
170 * @dev: device node of the host bridge having the range property
171 * @busno: bus number associated with the bridge root bus
172 * @bus_max: maximum number of buses for this bridge
173 * @resources: list where the range of resources will be added after DT parsing
174 * @io_base: pointer to a variable that will contain on return the physical
175 * address for the start of the I/O range. Can be NULL if the caller doesn't
176 * expect IO ranges to be present in the device tree.
178 * It is the caller's job to free the @resources list.
180 * This function will parse the "ranges" property of a PCI host bridge device
181 * node and setup the resource mapping based on its content. It is expected
182 * that the property conforms with the Power ePAPR document.
184 * It returns zero if the range parsing has been successful or a standard error
185 * value if it failed.
187 int of_pci_get_host_bridge_resources(struct device_node *dev,
188 unsigned char busno, unsigned char bus_max,
189 struct list_head *resources, resource_size_t *io_base)
191 struct resource_entry *window;
192 struct resource *res;
193 struct resource *bus_range;
194 struct of_pci_range range;
195 struct of_pci_range_parser parser;
200 *io_base = (resource_size_t)OF_BAD_ADDR;
202 bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
206 pr_info("PCI host bridge %s ranges:\n", dev->full_name);
208 err = of_pci_parse_bus_range(dev, bus_range);
210 bus_range->start = busno;
211 bus_range->end = bus_max;
212 bus_range->flags = IORESOURCE_BUS;
213 pr_info(" No bus range found for %s, using %pR\n",
214 dev->full_name, bus_range);
216 if (bus_range->end > bus_range->start + bus_max)
217 bus_range->end = bus_range->start + bus_max;
219 pci_add_resource(resources, bus_range);
221 /* Check for ranges property */
222 err = of_pci_range_parser_init(&parser, dev);
226 pr_debug("Parsing ranges property...\n");
227 for_each_of_pci_range(&parser, &range) {
228 /* Read next ranges element */
229 if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
230 snprintf(range_type, 4, " IO");
231 else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
232 snprintf(range_type, 4, "MEM");
234 snprintf(range_type, 4, "err");
235 pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type,
236 range.cpu_addr, range.cpu_addr + range.size - 1,
240 * If we failed translation or got a zero-sized region
241 * then skip this range
243 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
246 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
252 err = of_pci_range_to_resource(&range, dev, res);
258 if (resource_type(res) == IORESOURCE_IO) {
260 pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
263 goto conversion_failed;
265 if (*io_base != (resource_size_t)OF_BAD_ADDR)
266 pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
268 *io_base = range.cpu_addr;
271 pci_add_resource_offset(resources, res, res->start - range.pci_addr);
279 resource_list_for_each_entry(window, resources)
281 pci_free_resource_list(resources);
284 EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
285 #endif /* CONFIG_OF_ADDRESS */
287 #ifdef CONFIG_PCI_MSI
289 static LIST_HEAD(of_pci_msi_chip_list);
290 static DEFINE_MUTEX(of_pci_msi_chip_mutex);
292 int of_pci_msi_chip_add(struct msi_controller *chip)
294 if (!of_property_read_bool(chip->of_node, "msi-controller"))
297 mutex_lock(&of_pci_msi_chip_mutex);
298 list_add(&chip->list, &of_pci_msi_chip_list);
299 mutex_unlock(&of_pci_msi_chip_mutex);
303 EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
305 void of_pci_msi_chip_remove(struct msi_controller *chip)
307 mutex_lock(&of_pci_msi_chip_mutex);
308 list_del(&chip->list);
309 mutex_unlock(&of_pci_msi_chip_mutex);
311 EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
313 struct msi_controller *of_pci_find_msi_chip_by_node(struct device_node *of_node)
315 struct msi_controller *c;
317 mutex_lock(&of_pci_msi_chip_mutex);
318 list_for_each_entry(c, &of_pci_msi_chip_list, list) {
319 if (c->of_node == of_node) {
320 mutex_unlock(&of_pci_msi_chip_mutex);
324 mutex_unlock(&of_pci_msi_chip_mutex);
328 EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
330 #endif /* CONFIG_PCI_MSI */