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 * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
123 * is present and valid
125 void of_pci_check_probe_only(void)
130 ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val);
132 if (ret == -ENODATA || ret == -EOVERFLOW)
133 pr_warn("linux,pci-probe-only without valid value, ignoring\n");
138 pci_add_flags(PCI_PROBE_ONLY);
140 pci_clear_flags(PCI_PROBE_ONLY);
142 pr_info("PCI: PROBE_ONLY %sabled\n", val ? "en" : "dis");
144 EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
147 * of_pci_dma_configure - Setup DMA configuration
148 * @dev: ptr to pci_dev struct of the PCI device
150 * Function to update PCI devices's DMA configuration using the same
151 * info from the OF node of host bridge's parent (if any).
153 void of_pci_dma_configure(struct pci_dev *pci_dev)
155 struct device *dev = &pci_dev->dev;
156 struct device *bridge = pci_get_host_bridge_device(pci_dev);
161 of_dma_configure(dev, bridge->parent->of_node);
162 pci_put_host_bridge_device(bridge);
164 EXPORT_SYMBOL_GPL(of_pci_dma_configure);
166 #if defined(CONFIG_OF_ADDRESS)
168 * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT
169 * @dev: device node of the host bridge having the range property
170 * @busno: bus number associated with the bridge root bus
171 * @bus_max: maximum number of buses for this bridge
172 * @resources: list where the range of resources will be added after DT parsing
173 * @io_base: pointer to a variable that will contain on return the physical
174 * address for the start of the I/O range. Can be NULL if the caller doesn't
175 * expect IO ranges to be present in the device tree.
177 * It is the caller's job to free the @resources list.
179 * This function will parse the "ranges" property of a PCI host bridge device
180 * node and setup the resource mapping based on its content. It is expected
181 * that the property conforms with the Power ePAPR document.
183 * It returns zero if the range parsing has been successful or a standard error
184 * value if it failed.
186 int of_pci_get_host_bridge_resources(struct device_node *dev,
187 unsigned char busno, unsigned char bus_max,
188 struct list_head *resources, resource_size_t *io_base)
190 struct resource_entry *window;
191 struct resource *res;
192 struct resource *bus_range;
193 struct of_pci_range range;
194 struct of_pci_range_parser parser;
199 *io_base = (resource_size_t)OF_BAD_ADDR;
201 bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL);
205 pr_info("PCI host bridge %s ranges:\n", dev->full_name);
207 err = of_pci_parse_bus_range(dev, bus_range);
209 bus_range->start = busno;
210 bus_range->end = bus_max;
211 bus_range->flags = IORESOURCE_BUS;
212 pr_info(" No bus range found for %s, using %pR\n",
213 dev->full_name, bus_range);
215 if (bus_range->end > bus_range->start + bus_max)
216 bus_range->end = bus_range->start + bus_max;
218 pci_add_resource(resources, bus_range);
220 /* Check for ranges property */
221 err = of_pci_range_parser_init(&parser, dev);
225 pr_debug("Parsing ranges property...\n");
226 for_each_of_pci_range(&parser, &range) {
227 /* Read next ranges element */
228 if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
229 snprintf(range_type, 4, " IO");
230 else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
231 snprintf(range_type, 4, "MEM");
233 snprintf(range_type, 4, "err");
234 pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type,
235 range.cpu_addr, range.cpu_addr + range.size - 1,
239 * If we failed translation or got a zero-sized region
240 * then skip this range
242 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
245 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
251 err = of_pci_range_to_resource(&range, dev, res);
257 if (resource_type(res) == IORESOURCE_IO) {
259 pr_err("I/O range found for %s. Please provide an io_base pointer to save CPU base address\n",
262 goto conversion_failed;
264 if (*io_base != (resource_size_t)OF_BAD_ADDR)
265 pr_warn("More than one I/O resource converted for %s. CPU base address for old range lost!\n",
267 *io_base = range.cpu_addr;
270 pci_add_resource_offset(resources, res, res->start - range.pci_addr);
278 resource_list_for_each_entry(window, resources)
280 pci_free_resource_list(resources);
283 EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources);
284 #endif /* CONFIG_OF_ADDRESS */
286 #ifdef CONFIG_PCI_MSI
288 static LIST_HEAD(of_pci_msi_chip_list);
289 static DEFINE_MUTEX(of_pci_msi_chip_mutex);
291 int of_pci_msi_chip_add(struct msi_controller *chip)
293 if (!of_property_read_bool(chip->of_node, "msi-controller"))
296 mutex_lock(&of_pci_msi_chip_mutex);
297 list_add(&chip->list, &of_pci_msi_chip_list);
298 mutex_unlock(&of_pci_msi_chip_mutex);
302 EXPORT_SYMBOL_GPL(of_pci_msi_chip_add);
304 void of_pci_msi_chip_remove(struct msi_controller *chip)
306 mutex_lock(&of_pci_msi_chip_mutex);
307 list_del(&chip->list);
308 mutex_unlock(&of_pci_msi_chip_mutex);
310 EXPORT_SYMBOL_GPL(of_pci_msi_chip_remove);
312 struct msi_controller *of_pci_find_msi_chip_by_node(struct device_node *of_node)
314 struct msi_controller *c;
316 mutex_lock(&of_pci_msi_chip_mutex);
317 list_for_each_entry(c, &of_pci_msi_chip_list, list) {
318 if (c->of_node == of_node) {
319 mutex_unlock(&of_pci_msi_chip_mutex);
323 mutex_unlock(&of_pci_msi_chip_mutex);
327 EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
329 #endif /* CONFIG_PCI_MSI */