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7#define pr_fmt(fmt) "PCI: OF: " fmt
8
9#include <linux/irqdomain.h>
10#include <linux/kernel.h>
11#include <linux/pci.h>
12#include <linux/of.h>
13#include <linux/of_irq.h>
14#include <linux/of_address.h>
15#include <linux/of_pci.h>
16#include "pci.h"
17
18#ifdef CONFIG_PCI
19void pci_set_of_node(struct pci_dev *dev)
20{
21 if (!dev->bus->dev.of_node)
22 return;
23 dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node,
24 dev->devfn);
25 if (dev->dev.of_node)
26 dev->dev.fwnode = &dev->dev.of_node->fwnode;
27}
28
29void pci_release_of_node(struct pci_dev *dev)
30{
31 of_node_put(dev->dev.of_node);
32 dev->dev.of_node = NULL;
33 dev->dev.fwnode = NULL;
34}
35
36void pci_set_bus_of_node(struct pci_bus *bus)
37{
38 struct device_node *node;
39
40 if (bus->self == NULL) {
41 node = pcibios_get_phb_of_node(bus);
42 } else {
43 node = of_node_get(bus->self->dev.of_node);
44 if (node && of_property_read_bool(node, "external-facing"))
45 bus->self->external_facing = true;
46 }
47
48 bus->dev.of_node = node;
49
50 if (bus->dev.of_node)
51 bus->dev.fwnode = &bus->dev.of_node->fwnode;
52}
53
54void pci_release_bus_of_node(struct pci_bus *bus)
55{
56 of_node_put(bus->dev.of_node);
57 bus->dev.of_node = NULL;
58 bus->dev.fwnode = NULL;
59}
60
61struct device_node * __weak pcibios_get_phb_of_node(struct pci_bus *bus)
62{
63
64 if (WARN_ON(bus->self || bus->parent))
65 return NULL;
66
67
68
69
70
71
72 if (bus->bridge->of_node)
73 return of_node_get(bus->bridge->of_node);
74 if (bus->bridge->parent && bus->bridge->parent->of_node)
75 return of_node_get(bus->bridge->parent->of_node);
76 return NULL;
77}
78
79struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus)
80{
81#ifdef CONFIG_IRQ_DOMAIN
82 struct irq_domain *d;
83
84 if (!bus->dev.of_node)
85 return NULL;
86
87
88 d = of_msi_get_domain(&bus->dev, bus->dev.of_node, DOMAIN_BUS_PCI_MSI);
89 if (d)
90 return d;
91
92
93
94
95
96 d = irq_find_matching_host(bus->dev.of_node, DOMAIN_BUS_PCI_MSI);
97 if (d)
98 return d;
99
100 return irq_find_host(bus->dev.of_node);
101#else
102 return NULL;
103#endif
104}
105
106bool pci_host_of_has_msi_map(struct device *dev)
107{
108 if (dev && dev->of_node)
109 return of_get_property(dev->of_node, "msi-map", NULL);
110 return false;
111}
112
113static inline int __of_pci_pci_compare(struct device_node *node,
114 unsigned int data)
115{
116 int devfn;
117
118 devfn = of_pci_get_devfn(node);
119 if (devfn < 0)
120 return 0;
121
122 return devfn == data;
123}
124
125struct device_node *of_pci_find_child_device(struct device_node *parent,
126 unsigned int devfn)
127{
128 struct device_node *node, *node2;
129
130 for_each_child_of_node(parent, node) {
131 if (__of_pci_pci_compare(node, devfn))
132 return node;
133
134
135
136
137
138 if (of_node_name_eq(node, "multifunc-device")) {
139 for_each_child_of_node(node, node2) {
140 if (__of_pci_pci_compare(node2, devfn)) {
141 of_node_put(node);
142 return node2;
143 }
144 }
145 }
146 }
147 return NULL;
148}
149EXPORT_SYMBOL_GPL(of_pci_find_child_device);
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159
160int of_pci_get_devfn(struct device_node *np)
161{
162 u32 reg[5];
163 int error;
164
165 error = of_property_read_u32_array(np, "reg", reg, ARRAY_SIZE(reg));
166 if (error)
167 return error;
168
169 return (reg[0] >> 8) & 0xff;
170}
171EXPORT_SYMBOL_GPL(of_pci_get_devfn);
172
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179
180int of_pci_parse_bus_range(struct device_node *node, struct resource *res)
181{
182 u32 bus_range[2];
183 int error;
184
185 error = of_property_read_u32_array(node, "bus-range", bus_range,
186 ARRAY_SIZE(bus_range));
187 if (error)
188 return error;
189
190 res->name = node->name;
191 res->start = bus_range[0];
192 res->end = bus_range[1];
193 res->flags = IORESOURCE_BUS;
194
195 return 0;
196}
197EXPORT_SYMBOL_GPL(of_pci_parse_bus_range);
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215
216int of_get_pci_domain_nr(struct device_node *node)
217{
218 u32 domain;
219 int error;
220
221 error = of_property_read_u32(node, "linux,pci-domain", &domain);
222 if (error)
223 return error;
224
225 return (u16)domain;
226}
227EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
228
229
230
231
232
233void of_pci_check_probe_only(void)
234{
235 u32 val;
236 int ret;
237
238 ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val);
239 if (ret) {
240 if (ret == -ENODATA || ret == -EOVERFLOW)
241 pr_warn("linux,pci-probe-only without valid value, ignoring\n");
242 return;
243 }
244
245 if (val)
246 pci_add_flags(PCI_PROBE_ONLY);
247 else
248 pci_clear_flags(PCI_PROBE_ONLY);
249
250 pr_info("PROBE_ONLY %sabled\n", val ? "en" : "dis");
251}
252EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
253
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273
274static int devm_of_pci_get_host_bridge_resources(struct device *dev,
275 unsigned char busno, unsigned char bus_max,
276 struct list_head *resources,
277 struct list_head *ib_resources,
278 resource_size_t *io_base)
279{
280 struct device_node *dev_node = dev->of_node;
281 struct resource *res, tmp_res;
282 struct resource *bus_range;
283 struct of_pci_range range;
284 struct of_pci_range_parser parser;
285 const char *range_type;
286 int err;
287
288 if (io_base)
289 *io_base = (resource_size_t)OF_BAD_ADDR;
290
291 bus_range = devm_kzalloc(dev, sizeof(*bus_range), GFP_KERNEL);
292 if (!bus_range)
293 return -ENOMEM;
294
295 dev_info(dev, "host bridge %pOF ranges:\n", dev_node);
296
297 err = of_pci_parse_bus_range(dev_node, bus_range);
298 if (err) {
299 bus_range->start = busno;
300 bus_range->end = bus_max;
301 bus_range->flags = IORESOURCE_BUS;
302 dev_info(dev, " No bus range found for %pOF, using %pR\n",
303 dev_node, bus_range);
304 } else {
305 if (bus_range->end > bus_range->start + bus_max)
306 bus_range->end = bus_range->start + bus_max;
307 }
308 pci_add_resource(resources, bus_range);
309
310
311 err = of_pci_range_parser_init(&parser, dev_node);
312 if (err)
313 return 0;
314
315 dev_dbg(dev, "Parsing ranges property...\n");
316 for_each_of_pci_range(&parser, &range) {
317
318 if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
319 range_type = "IO";
320 else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
321 range_type = "MEM";
322 else
323 range_type = "err";
324 dev_info(dev, " %6s %#012llx..%#012llx -> %#012llx\n",
325 range_type, range.cpu_addr,
326 range.cpu_addr + range.size - 1, range.pci_addr);
327
328
329
330
331
332 if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
333 continue;
334
335 err = of_pci_range_to_resource(&range, dev_node, &tmp_res);
336 if (err)
337 continue;
338
339 res = devm_kmemdup(dev, &tmp_res, sizeof(tmp_res), GFP_KERNEL);
340 if (!res) {
341 err = -ENOMEM;
342 goto failed;
343 }
344
345 if (resource_type(res) == IORESOURCE_IO) {
346 if (!io_base) {
347 dev_err(dev, "I/O range found for %pOF. Please provide an io_base pointer to save CPU base address\n",
348 dev_node);
349 err = -EINVAL;
350 goto failed;
351 }
352 if (*io_base != (resource_size_t)OF_BAD_ADDR)
353 dev_warn(dev, "More than one I/O resource converted for %pOF. CPU base address for old range lost!\n",
354 dev_node);
355 *io_base = range.cpu_addr;
356 } else if (resource_type(res) == IORESOURCE_MEM) {
357 res->flags &= ~IORESOURCE_MEM_64;
358 }
359
360 pci_add_resource_offset(resources, res, res->start - range.pci_addr);
361 }
362
363
364 if (!ib_resources)
365 return 0;
366 err = of_pci_dma_range_parser_init(&parser, dev_node);
367 if (err)
368 return 0;
369
370 dev_dbg(dev, "Parsing dma-ranges property...\n");
371 for_each_of_pci_range(&parser, &range) {
372 struct resource_entry *entry;
373
374
375
376
377 if (((range.flags & IORESOURCE_TYPE_BITS) != IORESOURCE_MEM) ||
378 range.cpu_addr == OF_BAD_ADDR || range.size == 0)
379 continue;
380
381 dev_info(dev, " %6s %#012llx..%#012llx -> %#012llx\n",
382 "IB MEM", range.cpu_addr,
383 range.cpu_addr + range.size - 1, range.pci_addr);
384
385
386 err = of_pci_range_to_resource(&range, dev_node, &tmp_res);
387 if (err)
388 continue;
389
390 res = devm_kmemdup(dev, &tmp_res, sizeof(tmp_res), GFP_KERNEL);
391 if (!res) {
392 err = -ENOMEM;
393 goto failed;
394 }
395
396
397 resource_list_for_each_entry(entry, ib_resources)
398 if (entry->res->start > res->start)
399 break;
400
401 pci_add_resource_offset(&entry->node, res,
402 res->start - range.pci_addr);
403 }
404
405 return 0;
406
407failed:
408 pci_free_resource_list(resources);
409 return err;
410}
411
412#if IS_ENABLED(CONFIG_OF_IRQ)
413
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418
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420
421
422
423
424static int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq)
425{
426 struct device_node *dn, *ppnode;
427 struct pci_dev *ppdev;
428 __be32 laddr[3];
429 u8 pin;
430 int rc;
431
432
433
434
435
436 dn = pci_device_to_OF_node(pdev);
437 if (dn) {
438 rc = of_irq_parse_one(dn, 0, out_irq);
439 if (!rc)
440 return rc;
441 }
442
443
444
445
446
447
448 rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
449 if (rc != 0)
450 goto err;
451
452 if (pin == 0)
453 return -ENODEV;
454
455
456 for (;;) {
457
458 ppdev = pdev->bus->self;
459
460
461 if (ppdev == NULL) {
462 ppnode = pci_bus_to_OF_node(pdev->bus);
463
464
465 if (ppnode == NULL) {
466 rc = -EINVAL;
467 goto err;
468 }
469 } else {
470
471 ppnode = pci_device_to_OF_node(ppdev);
472 }
473
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477
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483
484
485
486 if (ppnode)
487 break;
488
489
490
491
492
493 pin = pci_swizzle_interrupt_pin(pdev, pin);
494 pdev = ppdev;
495 }
496
497 out_irq->np = ppnode;
498 out_irq->args_count = 1;
499 out_irq->args[0] = pin;
500 laddr[0] = cpu_to_be32((pdev->bus->number << 16) | (pdev->devfn << 8));
501 laddr[1] = laddr[2] = cpu_to_be32(0);
502 rc = of_irq_parse_raw(laddr, out_irq);
503 if (rc)
504 goto err;
505 return 0;
506err:
507 if (rc == -ENOENT) {
508 dev_warn(&pdev->dev,
509 "%s: no interrupt-map found, INTx interrupts not available\n",
510 __func__);
511 pr_warn_once("%s: possibly some PCI slots don't have level triggered interrupts capability\n",
512 __func__);
513 } else {
514 dev_err(&pdev->dev, "%s: failed with rc=%d\n", __func__, rc);
515 }
516 return rc;
517}
518
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528
529int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin)
530{
531 struct of_phandle_args oirq;
532 int ret;
533
534 ret = of_irq_parse_pci(dev, &oirq);
535 if (ret)
536 return 0;
537
538 return irq_create_of_mapping(&oirq);
539}
540EXPORT_SYMBOL_GPL(of_irq_parse_and_map_pci);
541#endif
542
543static int pci_parse_request_of_pci_ranges(struct device *dev,
544 struct pci_host_bridge *bridge)
545{
546 int err, res_valid = 0;
547 resource_size_t iobase;
548 struct resource_entry *win, *tmp;
549
550 INIT_LIST_HEAD(&bridge->windows);
551 INIT_LIST_HEAD(&bridge->dma_ranges);
552
553 err = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &bridge->windows,
554 &bridge->dma_ranges, &iobase);
555 if (err)
556 return err;
557
558 err = devm_request_pci_bus_resources(dev, &bridge->windows);
559 if (err)
560 return err;
561
562 resource_list_for_each_entry_safe(win, tmp, &bridge->windows) {
563 struct resource *res = win->res;
564
565 switch (resource_type(res)) {
566 case IORESOURCE_IO:
567 err = devm_pci_remap_iospace(dev, res, iobase);
568 if (err) {
569 dev_warn(dev, "error %d: failed to map resource %pR\n",
570 err, res);
571 resource_list_destroy_entry(win);
572 }
573 break;
574 case IORESOURCE_MEM:
575 res_valid |= !(res->flags & IORESOURCE_PREFETCH);
576
577 if (!(res->flags & IORESOURCE_PREFETCH))
578 if (upper_32_bits(resource_size(res)))
579 dev_warn(dev, "Memory resource size exceeds max for 32 bits\n");
580
581 break;
582 }
583 }
584
585 if (!res_valid)
586 dev_warn(dev, "non-prefetchable memory resource required\n");
587
588 return 0;
589}
590
591int devm_of_pci_bridge_init(struct device *dev, struct pci_host_bridge *bridge)
592{
593 if (!dev->of_node)
594 return 0;
595
596 bridge->swizzle_irq = pci_common_swizzle;
597 bridge->map_irq = of_irq_parse_and_map_pci;
598
599 return pci_parse_request_of_pci_ranges(dev, bridge);
600}
601
602#endif
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619int of_pci_get_max_link_speed(struct device_node *node)
620{
621 u32 max_link_speed;
622
623 if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
624 max_link_speed == 0 || max_link_speed > 4)
625 return -EINVAL;
626
627 return max_link_speed;
628}
629EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
630