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98d9f30c BH |
1 | /* |
2 | * PCI <-> OF mapping helpers | |
3 | * | |
4 | * Copyright 2011 IBM Corp. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
4670d610 | 11 | #define pr_fmt(fmt) "PCI: OF: " fmt |
98d9f30c | 12 | |
b165e2b6 | 13 | #include <linux/irqdomain.h> |
98d9f30c BH |
14 | #include <linux/kernel.h> |
15 | #include <linux/pci.h> | |
16 | #include <linux/of.h> | |
c8d17588 | 17 | #include <linux/of_irq.h> |
4670d610 | 18 | #include <linux/of_address.h> |
98d9f30c BH |
19 | #include <linux/of_pci.h> |
20 | #include "pci.h" | |
21 | ||
22 | void pci_set_of_node(struct pci_dev *dev) | |
23 | { | |
24 | if (!dev->bus->dev.of_node) | |
25 | return; | |
26 | dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node, | |
27 | dev->devfn); | |
28 | } | |
29 | ||
30 | void pci_release_of_node(struct pci_dev *dev) | |
31 | { | |
32 | of_node_put(dev->dev.of_node); | |
33 | dev->dev.of_node = NULL; | |
34 | } | |
35 | ||
36 | void pci_set_bus_of_node(struct pci_bus *bus) | |
37 | { | |
38 | if (bus->self == NULL) | |
39 | bus->dev.of_node = pcibios_get_phb_of_node(bus); | |
40 | else | |
41 | bus->dev.of_node = of_node_get(bus->self->dev.of_node); | |
42 | } | |
43 | ||
44 | void pci_release_bus_of_node(struct pci_bus *bus) | |
45 | { | |
46 | of_node_put(bus->dev.of_node); | |
47 | bus->dev.of_node = NULL; | |
48 | } | |
49 | ||
50 | struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus) | |
51 | { | |
52 | /* This should only be called for PHBs */ | |
53 | if (WARN_ON(bus->self || bus->parent)) | |
54 | return NULL; | |
55 | ||
4670d610 RH |
56 | /* |
57 | * Look for a node pointer in either the intermediary device we | |
58 | * create above the root bus or its own parent. Normally only | |
98d9f30c BH |
59 | * the later is populated. |
60 | */ | |
61 | if (bus->bridge->of_node) | |
62 | return of_node_get(bus->bridge->of_node); | |
69566dd8 | 63 | if (bus->bridge->parent && bus->bridge->parent->of_node) |
98d9f30c BH |
64 | return of_node_get(bus->bridge->parent->of_node); |
65 | return NULL; | |
66 | } | |
b165e2b6 MZ |
67 | |
68 | struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus) | |
69 | { | |
70 | #ifdef CONFIG_IRQ_DOMAIN | |
b165e2b6 MZ |
71 | struct irq_domain *d; |
72 | ||
73 | if (!bus->dev.of_node) | |
74 | return NULL; | |
75 | ||
76 | /* Start looking for a phandle to an MSI controller. */ | |
c8d17588 MZ |
77 | d = of_msi_get_domain(&bus->dev, bus->dev.of_node, DOMAIN_BUS_PCI_MSI); |
78 | if (d) | |
79 | return d; | |
471c931c MZ |
80 | |
81 | /* | |
82 | * If we don't have an msi-parent property, look for a domain | |
83 | * directly attached to the host bridge. | |
84 | */ | |
c8d17588 | 85 | d = irq_find_matching_host(bus->dev.of_node, DOMAIN_BUS_PCI_MSI); |
b165e2b6 MZ |
86 | if (d) |
87 | return d; | |
88 | ||
c8d17588 | 89 | return irq_find_host(bus->dev.of_node); |
b165e2b6 MZ |
90 | #else |
91 | return NULL; | |
92 | #endif | |
93 | } | |
4670d610 RH |
94 | |
95 | ||
96 | static inline int __of_pci_pci_compare(struct device_node *node, | |
97 | unsigned int data) | |
98 | { | |
99 | int devfn; | |
100 | ||
101 | devfn = of_pci_get_devfn(node); | |
102 | if (devfn < 0) | |
103 | return 0; | |
104 | ||
105 | return devfn == data; | |
106 | } | |
107 | ||
108 | struct device_node *of_pci_find_child_device(struct device_node *parent, | |
109 | unsigned int devfn) | |
110 | { | |
111 | struct device_node *node, *node2; | |
112 | ||
113 | for_each_child_of_node(parent, node) { | |
114 | if (__of_pci_pci_compare(node, devfn)) | |
115 | return node; | |
116 | /* | |
117 | * Some OFs create a parent node "multifunc-device" as | |
118 | * a fake root for all functions of a multi-function | |
119 | * device we go down them as well. | |
120 | */ | |
121 | if (!strcmp(node->name, "multifunc-device")) { | |
122 | for_each_child_of_node(node, node2) { | |
123 | if (__of_pci_pci_compare(node2, devfn)) { | |
124 | of_node_put(node); | |
125 | return node2; | |
126 | } | |
127 | } | |
128 | } | |
129 | } | |
130 | return NULL; | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(of_pci_find_child_device); | |
133 | ||
134 | /** | |
135 | * of_pci_get_devfn() - Get device and function numbers for a device node | |
136 | * @np: device node | |
137 | * | |
138 | * Parses a standard 5-cell PCI resource and returns an 8-bit value that can | |
139 | * be passed to the PCI_SLOT() and PCI_FUNC() macros to extract the device | |
140 | * and function numbers respectively. On error a negative error code is | |
141 | * returned. | |
142 | */ | |
143 | int of_pci_get_devfn(struct device_node *np) | |
144 | { | |
145 | u32 reg[5]; | |
146 | int error; | |
147 | ||
148 | error = of_property_read_u32_array(np, "reg", reg, ARRAY_SIZE(reg)); | |
149 | if (error) | |
150 | return error; | |
151 | ||
152 | return (reg[0] >> 8) & 0xff; | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(of_pci_get_devfn); | |
155 | ||
156 | /** | |
157 | * of_pci_parse_bus_range() - parse the bus-range property of a PCI device | |
158 | * @node: device node | |
159 | * @res: address to a struct resource to return the bus-range | |
160 | * | |
161 | * Returns 0 on success or a negative error-code on failure. | |
162 | */ | |
163 | int of_pci_parse_bus_range(struct device_node *node, struct resource *res) | |
164 | { | |
165 | u32 bus_range[2]; | |
166 | int error; | |
167 | ||
168 | error = of_property_read_u32_array(node, "bus-range", bus_range, | |
169 | ARRAY_SIZE(bus_range)); | |
170 | if (error) | |
171 | return error; | |
172 | ||
173 | res->name = node->name; | |
174 | res->start = bus_range[0]; | |
175 | res->end = bus_range[1]; | |
176 | res->flags = IORESOURCE_BUS; | |
177 | ||
178 | return 0; | |
179 | } | |
180 | EXPORT_SYMBOL_GPL(of_pci_parse_bus_range); | |
181 | ||
182 | /** | |
183 | * This function will try to obtain the host bridge domain number by | |
184 | * finding a property called "linux,pci-domain" of the given device node. | |
185 | * | |
186 | * @node: device tree node with the domain information | |
187 | * | |
188 | * Returns the associated domain number from DT in the range [0-0xffff], or | |
189 | * a negative value if the required property is not found. | |
190 | */ | |
191 | int of_get_pci_domain_nr(struct device_node *node) | |
192 | { | |
193 | u32 domain; | |
194 | int error; | |
195 | ||
196 | error = of_property_read_u32(node, "linux,pci-domain", &domain); | |
197 | if (error) | |
198 | return error; | |
199 | ||
200 | return (u16)domain; | |
201 | } | |
202 | EXPORT_SYMBOL_GPL(of_get_pci_domain_nr); | |
203 | ||
204 | /** | |
205 | * This function will try to find the limitation of link speed by finding | |
206 | * a property called "max-link-speed" of the given device node. | |
207 | * | |
208 | * @node: device tree node with the max link speed information | |
209 | * | |
210 | * Returns the associated max link speed from DT, or a negative value if the | |
211 | * required property is not found or is invalid. | |
212 | */ | |
213 | int of_pci_get_max_link_speed(struct device_node *node) | |
214 | { | |
215 | u32 max_link_speed; | |
216 | ||
217 | if (of_property_read_u32(node, "max-link-speed", &max_link_speed) || | |
218 | max_link_speed > 4) | |
219 | return -EINVAL; | |
220 | ||
221 | return max_link_speed; | |
222 | } | |
223 | EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed); | |
224 | ||
225 | /** | |
226 | * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only | |
227 | * is present and valid | |
228 | */ | |
229 | void of_pci_check_probe_only(void) | |
230 | { | |
231 | u32 val; | |
232 | int ret; | |
233 | ||
234 | ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val); | |
235 | if (ret) { | |
236 | if (ret == -ENODATA || ret == -EOVERFLOW) | |
237 | pr_warn("linux,pci-probe-only without valid value, ignoring\n"); | |
238 | return; | |
239 | } | |
240 | ||
241 | if (val) | |
242 | pci_add_flags(PCI_PROBE_ONLY); | |
243 | else | |
244 | pci_clear_flags(PCI_PROBE_ONLY); | |
245 | ||
246 | pr_info("PROBE_ONLY %sabled\n", val ? "en" : "dis"); | |
247 | } | |
248 | EXPORT_SYMBOL_GPL(of_pci_check_probe_only); | |
249 | ||
250 | #if defined(CONFIG_OF_ADDRESS) | |
251 | /** | |
252 | * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT | |
253 | * @dev: device node of the host bridge having the range property | |
254 | * @busno: bus number associated with the bridge root bus | |
255 | * @bus_max: maximum number of buses for this bridge | |
256 | * @resources: list where the range of resources will be added after DT parsing | |
257 | * @io_base: pointer to a variable that will contain on return the physical | |
258 | * address for the start of the I/O range. Can be NULL if the caller doesn't | |
259 | * expect I/O ranges to be present in the device tree. | |
260 | * | |
261 | * It is the caller's job to free the @resources list. | |
262 | * | |
263 | * This function will parse the "ranges" property of a PCI host bridge device | |
264 | * node and setup the resource mapping based on its content. It is expected | |
265 | * that the property conforms with the Power ePAPR document. | |
266 | * | |
267 | * It returns zero if the range parsing has been successful or a standard error | |
268 | * value if it failed. | |
269 | */ | |
270 | int of_pci_get_host_bridge_resources(struct device_node *dev, | |
271 | unsigned char busno, unsigned char bus_max, | |
272 | struct list_head *resources, resource_size_t *io_base) | |
273 | { | |
274 | struct resource_entry *window; | |
275 | struct resource *res; | |
276 | struct resource *bus_range; | |
277 | struct of_pci_range range; | |
278 | struct of_pci_range_parser parser; | |
279 | char range_type[4]; | |
280 | int err; | |
281 | ||
282 | if (io_base) | |
283 | *io_base = (resource_size_t)OF_BAD_ADDR; | |
284 | ||
285 | bus_range = kzalloc(sizeof(*bus_range), GFP_KERNEL); | |
286 | if (!bus_range) | |
287 | return -ENOMEM; | |
288 | ||
289 | pr_info("host bridge %pOF ranges:\n", dev); | |
290 | ||
291 | err = of_pci_parse_bus_range(dev, bus_range); | |
292 | if (err) { | |
293 | bus_range->start = busno; | |
294 | bus_range->end = bus_max; | |
295 | bus_range->flags = IORESOURCE_BUS; | |
296 | pr_info(" No bus range found for %pOF, using %pR\n", | |
297 | dev, bus_range); | |
298 | } else { | |
299 | if (bus_range->end > bus_range->start + bus_max) | |
300 | bus_range->end = bus_range->start + bus_max; | |
301 | } | |
302 | pci_add_resource(resources, bus_range); | |
303 | ||
304 | /* Check for ranges property */ | |
305 | err = of_pci_range_parser_init(&parser, dev); | |
306 | if (err) | |
307 | goto parse_failed; | |
308 | ||
309 | pr_debug("Parsing ranges property...\n"); | |
310 | for_each_of_pci_range(&parser, &range) { | |
311 | /* Read next ranges element */ | |
312 | if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO) | |
313 | snprintf(range_type, 4, " IO"); | |
314 | else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM) | |
315 | snprintf(range_type, 4, "MEM"); | |
316 | else | |
317 | snprintf(range_type, 4, "err"); | |
318 | pr_info(" %s %#010llx..%#010llx -> %#010llx\n", range_type, | |
319 | range.cpu_addr, range.cpu_addr + range.size - 1, | |
320 | range.pci_addr); | |
321 | ||
322 | /* | |
323 | * If we failed translation or got a zero-sized region | |
324 | * then skip this range | |
325 | */ | |
326 | if (range.cpu_addr == OF_BAD_ADDR || range.size == 0) | |
327 | continue; | |
328 | ||
329 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
330 | if (!res) { | |
331 | err = -ENOMEM; | |
332 | goto parse_failed; | |
333 | } | |
334 | ||
335 | err = of_pci_range_to_resource(&range, dev, res); | |
336 | if (err) { | |
337 | kfree(res); | |
338 | continue; | |
339 | } | |
340 | ||
341 | if (resource_type(res) == IORESOURCE_IO) { | |
342 | if (!io_base) { | |
343 | pr_err("I/O range found for %pOF. Please provide an io_base pointer to save CPU base address\n", | |
344 | dev); | |
345 | err = -EINVAL; | |
346 | goto conversion_failed; | |
347 | } | |
348 | if (*io_base != (resource_size_t)OF_BAD_ADDR) | |
349 | pr_warn("More than one I/O resource converted for %pOF. CPU base address for old range lost!\n", | |
350 | dev); | |
351 | *io_base = range.cpu_addr; | |
352 | } | |
353 | ||
354 | pci_add_resource_offset(resources, res, res->start - range.pci_addr); | |
355 | } | |
356 | ||
357 | return 0; | |
358 | ||
359 | conversion_failed: | |
360 | kfree(res); | |
361 | parse_failed: | |
362 | resource_list_for_each_entry(window, resources) | |
363 | kfree(window->res); | |
364 | pci_free_resource_list(resources); | |
365 | return err; | |
366 | } | |
367 | EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources); | |
368 | #endif /* CONFIG_OF_ADDRESS */ | |
369 | ||
370 | /** | |
371 | * of_pci_map_rid - Translate a requester ID through a downstream mapping. | |
372 | * @np: root complex device node. | |
373 | * @rid: PCI requester ID to map. | |
374 | * @map_name: property name of the map to use. | |
375 | * @map_mask_name: optional property name of the mask to use. | |
376 | * @target: optional pointer to a target device node. | |
377 | * @id_out: optional pointer to receive the translated ID. | |
378 | * | |
379 | * Given a PCI requester ID, look up the appropriate implementation-defined | |
380 | * platform ID and/or the target device which receives transactions on that | |
381 | * ID, as per the "iommu-map" and "msi-map" bindings. Either of @target or | |
382 | * @id_out may be NULL if only the other is required. If @target points to | |
383 | * a non-NULL device node pointer, only entries targeting that node will be | |
384 | * matched; if it points to a NULL value, it will receive the device node of | |
385 | * the first matching target phandle, with a reference held. | |
386 | * | |
387 | * Return: 0 on success or a standard error code on failure. | |
388 | */ | |
389 | int of_pci_map_rid(struct device_node *np, u32 rid, | |
390 | const char *map_name, const char *map_mask_name, | |
391 | struct device_node **target, u32 *id_out) | |
392 | { | |
393 | u32 map_mask, masked_rid; | |
394 | int map_len; | |
395 | const __be32 *map = NULL; | |
396 | ||
397 | if (!np || !map_name || (!target && !id_out)) | |
398 | return -EINVAL; | |
399 | ||
400 | map = of_get_property(np, map_name, &map_len); | |
401 | if (!map) { | |
402 | if (target) | |
403 | return -ENODEV; | |
404 | /* Otherwise, no map implies no translation */ | |
405 | *id_out = rid; | |
406 | return 0; | |
407 | } | |
408 | ||
409 | if (!map_len || map_len % (4 * sizeof(*map))) { | |
410 | pr_err("%pOF: Error: Bad %s length: %d\n", np, | |
411 | map_name, map_len); | |
412 | return -EINVAL; | |
413 | } | |
414 | ||
415 | /* The default is to select all bits. */ | |
416 | map_mask = 0xffffffff; | |
417 | ||
418 | /* | |
419 | * Can be overridden by "{iommu,msi}-map-mask" property. | |
420 | * If of_property_read_u32() fails, the default is used. | |
421 | */ | |
422 | if (map_mask_name) | |
423 | of_property_read_u32(np, map_mask_name, &map_mask); | |
424 | ||
425 | masked_rid = map_mask & rid; | |
426 | for ( ; map_len > 0; map_len -= 4 * sizeof(*map), map += 4) { | |
427 | struct device_node *phandle_node; | |
428 | u32 rid_base = be32_to_cpup(map + 0); | |
429 | u32 phandle = be32_to_cpup(map + 1); | |
430 | u32 out_base = be32_to_cpup(map + 2); | |
431 | u32 rid_len = be32_to_cpup(map + 3); | |
432 | ||
433 | if (rid_base & ~map_mask) { | |
434 | pr_err("%pOF: Invalid %s translation - %s-mask (0x%x) ignores rid-base (0x%x)\n", | |
435 | np, map_name, map_name, | |
436 | map_mask, rid_base); | |
437 | return -EFAULT; | |
438 | } | |
439 | ||
440 | if (masked_rid < rid_base || masked_rid >= rid_base + rid_len) | |
441 | continue; | |
442 | ||
443 | phandle_node = of_find_node_by_phandle(phandle); | |
444 | if (!phandle_node) | |
445 | return -ENODEV; | |
446 | ||
447 | if (target) { | |
448 | if (*target) | |
449 | of_node_put(phandle_node); | |
450 | else | |
451 | *target = phandle_node; | |
452 | ||
453 | if (*target != phandle_node) | |
454 | continue; | |
455 | } | |
456 | ||
457 | if (id_out) | |
458 | *id_out = masked_rid - rid_base + out_base; | |
459 | ||
460 | pr_debug("%pOF: %s, using mask %08x, rid-base: %08x, out-base: %08x, length: %08x, rid: %08x -> %08x\n", | |
461 | np, map_name, map_mask, rid_base, out_base, | |
462 | rid_len, rid, masked_rid - rid_base + out_base); | |
463 | return 0; | |
464 | } | |
465 | ||
466 | pr_err("%pOF: Invalid %s translation - no match for rid 0x%x on %pOF\n", | |
467 | np, map_name, rid, target && *target ? *target : NULL); | |
468 | return -EFAULT; | |
469 | } | |
470 | ||
471 | #if IS_ENABLED(CONFIG_OF_IRQ) | |
472 | /** | |
473 | * of_irq_parse_pci - Resolve the interrupt for a PCI device | |
474 | * @pdev: the device whose interrupt is to be resolved | |
475 | * @out_irq: structure of_irq filled by this function | |
476 | * | |
477 | * This function resolves the PCI interrupt for a given PCI device. If a | |
478 | * device-node exists for a given pci_dev, it will use normal OF tree | |
479 | * walking. If not, it will implement standard swizzling and walk up the | |
480 | * PCI tree until an device-node is found, at which point it will finish | |
481 | * resolving using the OF tree walking. | |
482 | */ | |
483 | int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq) | |
484 | { | |
485 | struct device_node *dn, *ppnode; | |
486 | struct pci_dev *ppdev; | |
487 | __be32 laddr[3]; | |
488 | u8 pin; | |
489 | int rc; | |
490 | ||
491 | /* | |
492 | * Check if we have a device node, if yes, fallback to standard | |
493 | * device tree parsing | |
494 | */ | |
495 | dn = pci_device_to_OF_node(pdev); | |
496 | if (dn) { | |
497 | rc = of_irq_parse_one(dn, 0, out_irq); | |
498 | if (!rc) | |
499 | return rc; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Ok, we don't, time to have fun. Let's start by building up an | |
504 | * interrupt spec. we assume #interrupt-cells is 1, which is standard | |
505 | * for PCI. If you do different, then don't use that routine. | |
506 | */ | |
507 | rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin); | |
508 | if (rc != 0) | |
509 | goto err; | |
510 | /* No pin, exit with no error message. */ | |
511 | if (pin == 0) | |
512 | return -ENODEV; | |
513 | ||
514 | /* Now we walk up the PCI tree */ | |
515 | for (;;) { | |
516 | /* Get the pci_dev of our parent */ | |
517 | ppdev = pdev->bus->self; | |
518 | ||
519 | /* Ouch, it's a host bridge... */ | |
520 | if (ppdev == NULL) { | |
521 | ppnode = pci_bus_to_OF_node(pdev->bus); | |
522 | ||
523 | /* No node for host bridge ? give up */ | |
524 | if (ppnode == NULL) { | |
525 | rc = -EINVAL; | |
526 | goto err; | |
527 | } | |
528 | } else { | |
529 | /* We found a P2P bridge, check if it has a node */ | |
530 | ppnode = pci_device_to_OF_node(ppdev); | |
531 | } | |
532 | ||
533 | /* | |
534 | * Ok, we have found a parent with a device-node, hand over to | |
535 | * the OF parsing code. | |
536 | * We build a unit address from the linux device to be used for | |
537 | * resolution. Note that we use the linux bus number which may | |
538 | * not match your firmware bus numbering. | |
539 | * Fortunately, in most cases, interrupt-map-mask doesn't | |
540 | * include the bus number as part of the matching. | |
541 | * You should still be careful about that though if you intend | |
542 | * to rely on this function (you ship a firmware that doesn't | |
543 | * create device nodes for all PCI devices). | |
544 | */ | |
545 | if (ppnode) | |
546 | break; | |
547 | ||
548 | /* | |
549 | * We can only get here if we hit a P2P bridge with no node; | |
550 | * let's do standard swizzling and try again | |
551 | */ | |
552 | pin = pci_swizzle_interrupt_pin(pdev, pin); | |
553 | pdev = ppdev; | |
554 | } | |
555 | ||
556 | out_irq->np = ppnode; | |
557 | out_irq->args_count = 1; | |
558 | out_irq->args[0] = pin; | |
559 | laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8)); | |
560 | laddr[1] = laddr[2] = cpu_to_be32(0); | |
561 | rc = of_irq_parse_raw(laddr, out_irq); | |
562 | if (rc) | |
563 | goto err; | |
564 | return 0; | |
565 | err: | |
566 | if (rc == -ENOENT) { | |
567 | dev_warn(&pdev->dev, | |
568 | "%s: no interrupt-map found, INTx interrupts not available\n", | |
569 | __func__); | |
570 | pr_warn_once("%s: possibly some PCI slots don't have level triggered interrupts capability\n", | |
571 | __func__); | |
572 | } else { | |
573 | dev_err(&pdev->dev, "%s: failed with rc=%d\n", __func__, rc); | |
574 | } | |
575 | return rc; | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(of_irq_parse_pci); | |
578 | ||
579 | /** | |
580 | * of_irq_parse_and_map_pci() - Decode a PCI IRQ from the device tree and map to a VIRQ | |
581 | * @dev: The PCI device needing an IRQ | |
582 | * @slot: PCI slot number; passed when used as map_irq callback. Unused | |
583 | * @pin: PCI IRQ pin number; passed when used as map_irq callback. Unused | |
584 | * | |
585 | * @slot and @pin are unused, but included in the function so that this | |
586 | * function can be used directly as the map_irq callback to | |
587 | * pci_assign_irq() and struct pci_host_bridge.map_irq pointer | |
588 | */ | |
589 | int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin) | |
590 | { | |
591 | struct of_phandle_args oirq; | |
592 | int ret; | |
593 | ||
594 | ret = of_irq_parse_pci(dev, &oirq); | |
595 | if (ret) | |
596 | return 0; /* Proper return code 0 == NO_IRQ */ | |
597 | ||
598 | return irq_create_of_mapping(&oirq); | |
599 | } | |
600 | EXPORT_SYMBOL_GPL(of_irq_parse_and_map_pci); | |
601 | #endif /* CONFIG_OF_IRQ */ |