1
2
3
4
5
6
7
8
9
10
11
12#include <linux/string.h>
13#include <linux/platform_device.h>
14#include <linux/of_device.h>
15#include <linux/of_irq.h>
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/dma-mapping.h>
19#include <linux/bootmem.h>
20#include <linux/err.h>
21#include <linux/slab.h>
22#include <linux/pm_runtime.h>
23#include <linux/pm_domain.h>
24#include <linux/idr.h>
25#include <linux/acpi.h>
26#include <linux/clk/clk-conf.h>
27#include <linux/limits.h>
28#include <linux/property.h>
29
30#include "base.h"
31#include "power/power.h"
32
33
34static DEFINE_IDA(platform_devid_ida);
35
36struct device platform_bus = {
37 .init_name = "platform",
38};
39EXPORT_SYMBOL_GPL(platform_bus);
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56void __weak arch_setup_pdev_archdata(struct platform_device *pdev)
57{
58}
59
60
61
62
63
64
65
66struct resource *platform_get_resource(struct platform_device *dev,
67 unsigned int type, unsigned int num)
68{
69 int i;
70
71 for (i = 0; i < dev->num_resources; i++) {
72 struct resource *r = &dev->resource[i];
73
74 if (type == resource_type(r) && num-- == 0)
75 return r;
76 }
77 return NULL;
78}
79EXPORT_SYMBOL_GPL(platform_get_resource);
80
81
82
83
84
85
86int platform_get_irq(struct platform_device *dev, unsigned int num)
87{
88#ifdef CONFIG_SPARC
89
90 if (!dev || num >= dev->archdata.num_irqs)
91 return -ENXIO;
92 return dev->archdata.irqs[num];
93#else
94 struct resource *r;
95 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
96 int ret;
97
98 ret = of_irq_get(dev->dev.of_node, num);
99 if (ret > 0 || ret == -EPROBE_DEFER)
100 return ret;
101 }
102
103 r = platform_get_resource(dev, IORESOURCE_IRQ, num);
104 if (has_acpi_companion(&dev->dev)) {
105 if (r && r->flags & IORESOURCE_DISABLED) {
106 int ret;
107
108 ret = acpi_irq_get(ACPI_HANDLE(&dev->dev), num, r);
109 if (ret)
110 return ret;
111 }
112 }
113
114
115
116
117
118
119
120 if (r && r->flags & IORESOURCE_BITS) {
121 struct irq_data *irqd;
122
123 irqd = irq_get_irq_data(r->start);
124 if (!irqd)
125 return -ENXIO;
126 irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
127 }
128
129 return r ? r->start : -ENXIO;
130#endif
131}
132EXPORT_SYMBOL_GPL(platform_get_irq);
133
134
135
136
137
138
139
140int platform_irq_count(struct platform_device *dev)
141{
142 int ret, nr = 0;
143
144 while ((ret = platform_get_irq(dev, nr)) >= 0)
145 nr++;
146
147 if (ret == -EPROBE_DEFER)
148 return ret;
149
150 return nr;
151}
152EXPORT_SYMBOL_GPL(platform_irq_count);
153
154
155
156
157
158
159
160struct resource *platform_get_resource_byname(struct platform_device *dev,
161 unsigned int type,
162 const char *name)
163{
164 int i;
165
166 for (i = 0; i < dev->num_resources; i++) {
167 struct resource *r = &dev->resource[i];
168
169 if (unlikely(!r->name))
170 continue;
171
172 if (type == resource_type(r) && !strcmp(r->name, name))
173 return r;
174 }
175 return NULL;
176}
177EXPORT_SYMBOL_GPL(platform_get_resource_byname);
178
179
180
181
182
183
184int platform_get_irq_byname(struct platform_device *dev, const char *name)
185{
186 struct resource *r;
187
188 if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
189 int ret;
190
191 ret = of_irq_get_byname(dev->dev.of_node, name);
192 if (ret > 0 || ret == -EPROBE_DEFER)
193 return ret;
194 }
195
196 r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
197 return r ? r->start : -ENXIO;
198}
199EXPORT_SYMBOL_GPL(platform_get_irq_byname);
200
201
202
203
204
205
206int platform_add_devices(struct platform_device **devs, int num)
207{
208 int i, ret = 0;
209
210 for (i = 0; i < num; i++) {
211 ret = platform_device_register(devs[i]);
212 if (ret) {
213 while (--i >= 0)
214 platform_device_unregister(devs[i]);
215 break;
216 }
217 }
218
219 return ret;
220}
221EXPORT_SYMBOL_GPL(platform_add_devices);
222
223struct platform_object {
224 struct platform_device pdev;
225 char name[];
226};
227
228
229
230
231
232
233
234
235void platform_device_put(struct platform_device *pdev)
236{
237 if (pdev)
238 put_device(&pdev->dev);
239}
240EXPORT_SYMBOL_GPL(platform_device_put);
241
242static void platform_device_release(struct device *dev)
243{
244 struct platform_object *pa = container_of(dev, struct platform_object,
245 pdev.dev);
246
247 of_device_node_put(&pa->pdev.dev);
248 kfree(pa->pdev.dev.platform_data);
249 kfree(pa->pdev.mfd_cell);
250 kfree(pa->pdev.resource);
251 kfree(pa->pdev.driver_override);
252 kfree(pa);
253}
254
255
256
257
258
259
260
261
262
263struct platform_device *platform_device_alloc(const char *name, int id)
264{
265 struct platform_object *pa;
266
267 pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL);
268 if (pa) {
269 strcpy(pa->name, name);
270 pa->pdev.name = pa->name;
271 pa->pdev.id = id;
272 device_initialize(&pa->pdev.dev);
273 pa->pdev.dev.release = platform_device_release;
274 arch_setup_pdev_archdata(&pa->pdev);
275 }
276
277 return pa ? &pa->pdev : NULL;
278}
279EXPORT_SYMBOL_GPL(platform_device_alloc);
280
281
282
283
284
285
286
287
288
289
290
291int platform_device_add_resources(struct platform_device *pdev,
292 const struct resource *res, unsigned int num)
293{
294 struct resource *r = NULL;
295
296 if (res) {
297 r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
298 if (!r)
299 return -ENOMEM;
300 }
301
302 kfree(pdev->resource);
303 pdev->resource = r;
304 pdev->num_resources = num;
305 return 0;
306}
307EXPORT_SYMBOL_GPL(platform_device_add_resources);
308
309
310
311
312
313
314
315
316
317
318
319int platform_device_add_data(struct platform_device *pdev, const void *data,
320 size_t size)
321{
322 void *d = NULL;
323
324 if (data) {
325 d = kmemdup(data, size, GFP_KERNEL);
326 if (!d)
327 return -ENOMEM;
328 }
329
330 kfree(pdev->dev.platform_data);
331 pdev->dev.platform_data = d;
332 return 0;
333}
334EXPORT_SYMBOL_GPL(platform_device_add_data);
335
336
337
338
339
340
341
342
343
344
345int platform_device_add_properties(struct platform_device *pdev,
346 const struct property_entry *properties)
347{
348 return device_add_properties(&pdev->dev, properties);
349}
350EXPORT_SYMBOL_GPL(platform_device_add_properties);
351
352
353
354
355
356
357
358
359int platform_device_add(struct platform_device *pdev)
360{
361 int i, ret;
362
363 if (!pdev)
364 return -EINVAL;
365
366 if (!pdev->dev.parent)
367 pdev->dev.parent = &platform_bus;
368
369 pdev->dev.bus = &platform_bus_type;
370
371 switch (pdev->id) {
372 default:
373 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
374 break;
375 case PLATFORM_DEVID_NONE:
376 dev_set_name(&pdev->dev, "%s", pdev->name);
377 break;
378 case PLATFORM_DEVID_AUTO:
379
380
381
382
383
384 ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL);
385 if (ret < 0)
386 goto err_out;
387 pdev->id = ret;
388 pdev->id_auto = true;
389 dev_set_name(&pdev->dev, "%s.%d.auto", pdev->name, pdev->id);
390 break;
391 }
392
393 for (i = 0; i < pdev->num_resources; i++) {
394 struct resource *p, *r = &pdev->resource[i];
395
396 if (r->name == NULL)
397 r->name = dev_name(&pdev->dev);
398
399 p = r->parent;
400 if (!p) {
401 if (resource_type(r) == IORESOURCE_MEM)
402 p = &iomem_resource;
403 else if (resource_type(r) == IORESOURCE_IO)
404 p = &ioport_resource;
405 }
406
407 if (p && insert_resource(p, r)) {
408 dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
409 ret = -EBUSY;
410 goto failed;
411 }
412 }
413
414 pr_debug("Registering platform device '%s'. Parent at %s\n",
415 dev_name(&pdev->dev), dev_name(pdev->dev.parent));
416
417 ret = device_add(&pdev->dev);
418 if (ret == 0)
419 return ret;
420
421 failed:
422 if (pdev->id_auto) {
423 ida_simple_remove(&platform_devid_ida, pdev->id);
424 pdev->id = PLATFORM_DEVID_AUTO;
425 }
426
427 while (--i >= 0) {
428 struct resource *r = &pdev->resource[i];
429 if (r->parent)
430 release_resource(r);
431 }
432
433 err_out:
434 return ret;
435}
436EXPORT_SYMBOL_GPL(platform_device_add);
437
438
439
440
441
442
443
444
445
446void platform_device_del(struct platform_device *pdev)
447{
448 int i;
449
450 if (pdev) {
451 device_remove_properties(&pdev->dev);
452 device_del(&pdev->dev);
453
454 if (pdev->id_auto) {
455 ida_simple_remove(&platform_devid_ida, pdev->id);
456 pdev->id = PLATFORM_DEVID_AUTO;
457 }
458
459 for (i = 0; i < pdev->num_resources; i++) {
460 struct resource *r = &pdev->resource[i];
461 if (r->parent)
462 release_resource(r);
463 }
464 }
465}
466EXPORT_SYMBOL_GPL(platform_device_del);
467
468
469
470
471
472int platform_device_register(struct platform_device *pdev)
473{
474 device_initialize(&pdev->dev);
475 arch_setup_pdev_archdata(pdev);
476 return platform_device_add(pdev);
477}
478EXPORT_SYMBOL_GPL(platform_device_register);
479
480
481
482
483
484
485
486
487
488void platform_device_unregister(struct platform_device *pdev)
489{
490 platform_device_del(pdev);
491 platform_device_put(pdev);
492}
493EXPORT_SYMBOL_GPL(platform_device_unregister);
494
495
496
497
498
499
500
501
502
503struct platform_device *platform_device_register_full(
504 const struct platform_device_info *pdevinfo)
505{
506 int ret = -ENOMEM;
507 struct platform_device *pdev;
508
509 pdev = platform_device_alloc(pdevinfo->name, pdevinfo->id);
510 if (!pdev)
511 goto err_alloc;
512
513 pdev->dev.parent = pdevinfo->parent;
514 pdev->dev.fwnode = pdevinfo->fwnode;
515
516 if (pdevinfo->dma_mask) {
517
518
519
520
521
522
523 pdev->dev.dma_mask =
524 kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
525 if (!pdev->dev.dma_mask)
526 goto err;
527
528 *pdev->dev.dma_mask = pdevinfo->dma_mask;
529 pdev->dev.coherent_dma_mask = pdevinfo->dma_mask;
530 }
531
532 ret = platform_device_add_resources(pdev,
533 pdevinfo->res, pdevinfo->num_res);
534 if (ret)
535 goto err;
536
537 ret = platform_device_add_data(pdev,
538 pdevinfo->data, pdevinfo->size_data);
539 if (ret)
540 goto err;
541
542 if (pdevinfo->properties) {
543 ret = platform_device_add_properties(pdev,
544 pdevinfo->properties);
545 if (ret)
546 goto err;
547 }
548
549 ret = platform_device_add(pdev);
550 if (ret) {
551err:
552 ACPI_COMPANION_SET(&pdev->dev, NULL);
553 kfree(pdev->dev.dma_mask);
554
555err_alloc:
556 platform_device_put(pdev);
557 return ERR_PTR(ret);
558 }
559
560 return pdev;
561}
562EXPORT_SYMBOL_GPL(platform_device_register_full);
563
564static int platform_drv_probe(struct device *_dev)
565{
566 struct platform_driver *drv = to_platform_driver(_dev->driver);
567 struct platform_device *dev = to_platform_device(_dev);
568 int ret;
569
570 ret = of_clk_set_defaults(_dev->of_node, false);
571 if (ret < 0)
572 return ret;
573
574 ret = dev_pm_domain_attach(_dev, true);
575 if (ret)
576 goto out;
577
578 if (drv->probe) {
579 ret = drv->probe(dev);
580 if (ret)
581 dev_pm_domain_detach(_dev, true);
582 }
583
584out:
585 if (drv->prevent_deferred_probe && ret == -EPROBE_DEFER) {
586 dev_warn(_dev, "probe deferral not supported\n");
587 ret = -ENXIO;
588 }
589
590 return ret;
591}
592
593static int platform_drv_probe_fail(struct device *_dev)
594{
595 return -ENXIO;
596}
597
598static int platform_drv_remove(struct device *_dev)
599{
600 struct platform_driver *drv = to_platform_driver(_dev->driver);
601 struct platform_device *dev = to_platform_device(_dev);
602 int ret = 0;
603
604 if (drv->remove)
605 ret = drv->remove(dev);
606 dev_pm_domain_detach(_dev, true);
607
608 return ret;
609}
610
611static void platform_drv_shutdown(struct device *_dev)
612{
613 struct platform_driver *drv = to_platform_driver(_dev->driver);
614 struct platform_device *dev = to_platform_device(_dev);
615
616 if (drv->shutdown)
617 drv->shutdown(dev);
618}
619
620
621
622
623
624
625int __platform_driver_register(struct platform_driver *drv,
626 struct module *owner)
627{
628 drv->driver.owner = owner;
629 drv->driver.bus = &platform_bus_type;
630 drv->driver.probe = platform_drv_probe;
631 drv->driver.remove = platform_drv_remove;
632 drv->driver.shutdown = platform_drv_shutdown;
633
634 return driver_register(&drv->driver);
635}
636EXPORT_SYMBOL_GPL(__platform_driver_register);
637
638
639
640
641
642void platform_driver_unregister(struct platform_driver *drv)
643{
644 driver_unregister(&drv->driver);
645}
646EXPORT_SYMBOL_GPL(platform_driver_unregister);
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668int __init_or_module __platform_driver_probe(struct platform_driver *drv,
669 int (*probe)(struct platform_device *), struct module *module)
670{
671 int retval, code;
672
673 if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
674 pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
675 drv->driver.name, __func__);
676 return -EINVAL;
677 }
678
679
680
681
682
683
684 drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
685
686
687
688
689
690 drv->prevent_deferred_probe = true;
691
692
693 drv->driver.suppress_bind_attrs = true;
694
695
696 drv->probe = probe;
697 retval = code = __platform_driver_register(drv, module);
698
699
700
701
702
703
704
705 spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
706 drv->probe = NULL;
707 if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
708 retval = -ENODEV;
709 drv->driver.probe = platform_drv_probe_fail;
710 spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
711
712 if (code != retval)
713 platform_driver_unregister(drv);
714 return retval;
715}
716EXPORT_SYMBOL_GPL(__platform_driver_probe);
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733struct platform_device * __init_or_module __platform_create_bundle(
734 struct platform_driver *driver,
735 int (*probe)(struct platform_device *),
736 struct resource *res, unsigned int n_res,
737 const void *data, size_t size, struct module *module)
738{
739 struct platform_device *pdev;
740 int error;
741
742 pdev = platform_device_alloc(driver->driver.name, -1);
743 if (!pdev) {
744 error = -ENOMEM;
745 goto err_out;
746 }
747
748 error = platform_device_add_resources(pdev, res, n_res);
749 if (error)
750 goto err_pdev_put;
751
752 error = platform_device_add_data(pdev, data, size);
753 if (error)
754 goto err_pdev_put;
755
756 error = platform_device_add(pdev);
757 if (error)
758 goto err_pdev_put;
759
760 error = __platform_driver_probe(driver, probe, module);
761 if (error)
762 goto err_pdev_del;
763
764 return pdev;
765
766err_pdev_del:
767 platform_device_del(pdev);
768err_pdev_put:
769 platform_device_put(pdev);
770err_out:
771 return ERR_PTR(error);
772}
773EXPORT_SYMBOL_GPL(__platform_create_bundle);
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788int __platform_register_drivers(struct platform_driver * const *drivers,
789 unsigned int count, struct module *owner)
790{
791 unsigned int i;
792 int err;
793
794 for (i = 0; i < count; i++) {
795 pr_debug("registering platform driver %ps\n", drivers[i]);
796
797 err = __platform_driver_register(drivers[i], owner);
798 if (err < 0) {
799 pr_err("failed to register platform driver %ps: %d\n",
800 drivers[i], err);
801 goto error;
802 }
803 }
804
805 return 0;
806
807error:
808 while (i--) {
809 pr_debug("unregistering platform driver %ps\n", drivers[i]);
810 platform_driver_unregister(drivers[i]);
811 }
812
813 return err;
814}
815EXPORT_SYMBOL_GPL(__platform_register_drivers);
816
817
818
819
820
821
822
823
824
825
826void platform_unregister_drivers(struct platform_driver * const *drivers,
827 unsigned int count)
828{
829 while (count--) {
830 pr_debug("unregistering platform driver %ps\n", drivers[count]);
831 platform_driver_unregister(drivers[count]);
832 }
833}
834EXPORT_SYMBOL_GPL(platform_unregister_drivers);
835
836
837
838
839
840
841
842static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
843 char *buf)
844{
845 struct platform_device *pdev = to_platform_device(dev);
846 int len;
847
848 len = of_device_modalias(dev, buf, PAGE_SIZE);
849 if (len != -ENODEV)
850 return len;
851
852 len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
853 if (len != -ENODEV)
854 return len;
855
856 len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
857
858 return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
859}
860static DEVICE_ATTR_RO(modalias);
861
862static ssize_t driver_override_store(struct device *dev,
863 struct device_attribute *attr,
864 const char *buf, size_t count)
865{
866 struct platform_device *pdev = to_platform_device(dev);
867 char *driver_override, *old, *cp;
868
869
870 if (count >= (PAGE_SIZE - 1))
871 return -EINVAL;
872
873 driver_override = kstrndup(buf, count, GFP_KERNEL);
874 if (!driver_override)
875 return -ENOMEM;
876
877 cp = strchr(driver_override, '\n');
878 if (cp)
879 *cp = '\0';
880
881 device_lock(dev);
882 old = pdev->driver_override;
883 if (strlen(driver_override)) {
884 pdev->driver_override = driver_override;
885 } else {
886 kfree(driver_override);
887 pdev->driver_override = NULL;
888 }
889 device_unlock(dev);
890
891 kfree(old);
892
893 return count;
894}
895
896static ssize_t driver_override_show(struct device *dev,
897 struct device_attribute *attr, char *buf)
898{
899 struct platform_device *pdev = to_platform_device(dev);
900 ssize_t len;
901
902 device_lock(dev);
903 len = sprintf(buf, "%s\n", pdev->driver_override);
904 device_unlock(dev);
905 return len;
906}
907static DEVICE_ATTR_RW(driver_override);
908
909
910static struct attribute *platform_dev_attrs[] = {
911 &dev_attr_modalias.attr,
912 &dev_attr_driver_override.attr,
913 NULL,
914};
915ATTRIBUTE_GROUPS(platform_dev);
916
917static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
918{
919 struct platform_device *pdev = to_platform_device(dev);
920 int rc;
921
922
923 rc = of_device_uevent_modalias(dev, env);
924 if (rc != -ENODEV)
925 return rc;
926
927 rc = acpi_device_uevent_modalias(dev, env);
928 if (rc != -ENODEV)
929 return rc;
930
931 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
932 pdev->name);
933 return 0;
934}
935
936static const struct platform_device_id *platform_match_id(
937 const struct platform_device_id *id,
938 struct platform_device *pdev)
939{
940 while (id->name[0]) {
941 if (strcmp(pdev->name, id->name) == 0) {
942 pdev->id_entry = id;
943 return id;
944 }
945 id++;
946 }
947 return NULL;
948}
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963static int platform_match(struct device *dev, struct device_driver *drv)
964{
965 struct platform_device *pdev = to_platform_device(dev);
966 struct platform_driver *pdrv = to_platform_driver(drv);
967
968
969 if (pdev->driver_override)
970 return !strcmp(pdev->driver_override, drv->name);
971
972
973 if (of_driver_match_device(dev, drv))
974 return 1;
975
976
977 if (acpi_driver_match_device(dev, drv))
978 return 1;
979
980
981 if (pdrv->id_table)
982 return platform_match_id(pdrv->id_table, pdev) != NULL;
983
984
985 return (strcmp(pdev->name, drv->name) == 0);
986}
987
988#ifdef CONFIG_PM_SLEEP
989
990static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
991{
992 struct platform_driver *pdrv = to_platform_driver(dev->driver);
993 struct platform_device *pdev = to_platform_device(dev);
994 int ret = 0;
995
996 if (dev->driver && pdrv->suspend)
997 ret = pdrv->suspend(pdev, mesg);
998
999 return ret;
1000}
1001
1002static int platform_legacy_resume(struct device *dev)
1003{
1004 struct platform_driver *pdrv = to_platform_driver(dev->driver);
1005 struct platform_device *pdev = to_platform_device(dev);
1006 int ret = 0;
1007
1008 if (dev->driver && pdrv->resume)
1009 ret = pdrv->resume(pdev);
1010
1011 return ret;
1012}
1013
1014#endif
1015
1016#ifdef CONFIG_SUSPEND
1017
1018int platform_pm_suspend(struct device *dev)
1019{
1020 struct device_driver *drv = dev->driver;
1021 int ret = 0;
1022
1023 if (!drv)
1024 return 0;
1025
1026 if (drv->pm) {
1027 if (drv->pm->suspend)
1028 ret = drv->pm->suspend(dev);
1029 } else {
1030 ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
1031 }
1032
1033 return ret;
1034}
1035
1036int platform_pm_resume(struct device *dev)
1037{
1038 struct device_driver *drv = dev->driver;
1039 int ret = 0;
1040
1041 if (!drv)
1042 return 0;
1043
1044 if (drv->pm) {
1045 if (drv->pm->resume)
1046 ret = drv->pm->resume(dev);
1047 } else {
1048 ret = platform_legacy_resume(dev);
1049 }
1050
1051 return ret;
1052}
1053
1054#endif
1055
1056#ifdef CONFIG_HIBERNATE_CALLBACKS
1057
1058int platform_pm_freeze(struct device *dev)
1059{
1060 struct device_driver *drv = dev->driver;
1061 int ret = 0;
1062
1063 if (!drv)
1064 return 0;
1065
1066 if (drv->pm) {
1067 if (drv->pm->freeze)
1068 ret = drv->pm->freeze(dev);
1069 } else {
1070 ret = platform_legacy_suspend(dev, PMSG_FREEZE);
1071 }
1072
1073 return ret;
1074}
1075
1076int platform_pm_thaw(struct device *dev)
1077{
1078 struct device_driver *drv = dev->driver;
1079 int ret = 0;
1080
1081 if (!drv)
1082 return 0;
1083
1084 if (drv->pm) {
1085 if (drv->pm->thaw)
1086 ret = drv->pm->thaw(dev);
1087 } else {
1088 ret = platform_legacy_resume(dev);
1089 }
1090
1091 return ret;
1092}
1093
1094int platform_pm_poweroff(struct device *dev)
1095{
1096 struct device_driver *drv = dev->driver;
1097 int ret = 0;
1098
1099 if (!drv)
1100 return 0;
1101
1102 if (drv->pm) {
1103 if (drv->pm->poweroff)
1104 ret = drv->pm->poweroff(dev);
1105 } else {
1106 ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
1107 }
1108
1109 return ret;
1110}
1111
1112int platform_pm_restore(struct device *dev)
1113{
1114 struct device_driver *drv = dev->driver;
1115 int ret = 0;
1116
1117 if (!drv)
1118 return 0;
1119
1120 if (drv->pm) {
1121 if (drv->pm->restore)
1122 ret = drv->pm->restore(dev);
1123 } else {
1124 ret = platform_legacy_resume(dev);
1125 }
1126
1127 return ret;
1128}
1129
1130#endif
1131
1132int platform_dma_configure(struct device *dev)
1133{
1134 enum dev_dma_attr attr;
1135 int ret = 0;
1136
1137 if (dev->of_node) {
1138 ret = of_dma_configure(dev, dev->of_node, true);
1139 } else if (has_acpi_companion(dev)) {
1140 attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode));
1141 if (attr != DEV_DMA_NOT_SUPPORTED)
1142 ret = acpi_dma_configure(dev, attr);
1143 }
1144
1145 return ret;
1146}
1147
1148static const struct dev_pm_ops platform_dev_pm_ops = {
1149 .runtime_suspend = pm_generic_runtime_suspend,
1150 .runtime_resume = pm_generic_runtime_resume,
1151 USE_PLATFORM_PM_SLEEP_OPS
1152};
1153
1154struct bus_type platform_bus_type = {
1155 .name = "platform",
1156 .dev_groups = platform_dev_groups,
1157 .match = platform_match,
1158 .uevent = platform_uevent,
1159 .dma_configure = platform_dma_configure,
1160 .pm = &platform_dev_pm_ops,
1161};
1162EXPORT_SYMBOL_GPL(platform_bus_type);
1163
1164int __init platform_bus_init(void)
1165{
1166 int error;
1167
1168 early_platform_cleanup();
1169
1170 error = device_register(&platform_bus);
1171 if (error) {
1172 put_device(&platform_bus);
1173 return error;
1174 }
1175 error = bus_register(&platform_bus_type);
1176 if (error)
1177 device_unregister(&platform_bus);
1178 of_platform_register_reconfig_notifier();
1179 return error;
1180}
1181
1182#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
1183u64 dma_get_required_mask(struct device *dev)
1184{
1185 u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
1186 u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
1187 u64 mask;
1188
1189 if (!high_totalram) {
1190
1191 low_totalram = (1 << (fls(low_totalram) - 1));
1192 low_totalram += low_totalram - 1;
1193 mask = low_totalram;
1194 } else {
1195 high_totalram = (1 << (fls(high_totalram) - 1));
1196 high_totalram += high_totalram - 1;
1197 mask = (((u64)high_totalram) << 32) + 0xffffffff;
1198 }
1199 return mask;
1200}
1201EXPORT_SYMBOL_GPL(dma_get_required_mask);
1202#endif
1203
1204static __initdata LIST_HEAD(early_platform_driver_list);
1205static __initdata LIST_HEAD(early_platform_device_list);
1206
1207
1208
1209
1210
1211
1212
1213
1214int __init early_platform_driver_register(struct early_platform_driver *epdrv,
1215 char *buf)
1216{
1217 char *tmp;
1218 int n;
1219
1220
1221
1222
1223 if (!epdrv->list.next) {
1224 INIT_LIST_HEAD(&epdrv->list);
1225 list_add_tail(&epdrv->list, &early_platform_driver_list);
1226 }
1227
1228
1229
1230
1231
1232 n = strlen(epdrv->pdrv->driver.name);
1233 if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
1234 list_move(&epdrv->list, &early_platform_driver_list);
1235
1236
1237 if (buf[n] == '\0' || buf[n] == ',')
1238 epdrv->requested_id = -1;
1239 else {
1240 epdrv->requested_id = simple_strtoul(&buf[n + 1],
1241 &tmp, 10);
1242
1243 if (buf[n] != '.' || (tmp == &buf[n + 1])) {
1244 epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
1245 n = 0;
1246 } else
1247 n += strcspn(&buf[n + 1], ",") + 1;
1248 }
1249
1250 if (buf[n] == ',')
1251 n++;
1252
1253 if (epdrv->bufsize) {
1254 memcpy(epdrv->buffer, &buf[n],
1255 min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
1256 epdrv->buffer[epdrv->bufsize - 1] = '\0';
1257 }
1258 }
1259
1260 return 0;
1261}
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271void __init early_platform_add_devices(struct platform_device **devs, int num)
1272{
1273 struct device *dev;
1274 int i;
1275
1276
1277 for (i = 0; i < num; i++) {
1278 dev = &devs[i]->dev;
1279
1280 if (!dev->devres_head.next) {
1281 pm_runtime_early_init(dev);
1282 INIT_LIST_HEAD(&dev->devres_head);
1283 list_add_tail(&dev->devres_head,
1284 &early_platform_device_list);
1285 }
1286 }
1287}
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297void __init early_platform_driver_register_all(char *class_str)
1298{
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313 parse_early_options(class_str);
1314}
1315
1316
1317
1318
1319
1320
1321static struct platform_device * __init
1322early_platform_match(struct early_platform_driver *epdrv, int id)
1323{
1324 struct platform_device *pd;
1325
1326 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1327 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1328 if (pd->id == id)
1329 return pd;
1330
1331 return NULL;
1332}
1333
1334
1335
1336
1337
1338
1339static int __init early_platform_left(struct early_platform_driver *epdrv,
1340 int id)
1341{
1342 struct platform_device *pd;
1343
1344 list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
1345 if (platform_match(&pd->dev, &epdrv->pdrv->driver))
1346 if (pd->id >= id)
1347 return 1;
1348
1349 return 0;
1350}
1351
1352
1353
1354
1355
1356
1357
1358static int __init early_platform_driver_probe_id(char *class_str,
1359 int id,
1360 int nr_probe)
1361{
1362 struct early_platform_driver *epdrv;
1363 struct platform_device *match;
1364 int match_id;
1365 int n = 0;
1366 int left = 0;
1367
1368 list_for_each_entry(epdrv, &early_platform_driver_list, list) {
1369
1370 if (strcmp(class_str, epdrv->class_str))
1371 continue;
1372
1373 if (id == -2) {
1374 match_id = epdrv->requested_id;
1375 left = 1;
1376
1377 } else {
1378 match_id = id;
1379 left += early_platform_left(epdrv, id);
1380
1381
1382 switch (epdrv->requested_id) {
1383 case EARLY_PLATFORM_ID_ERROR:
1384 case EARLY_PLATFORM_ID_UNSET:
1385 break;
1386 default:
1387 if (epdrv->requested_id == id)
1388 match_id = EARLY_PLATFORM_ID_UNSET;
1389 }
1390 }
1391
1392 switch (match_id) {
1393 case EARLY_PLATFORM_ID_ERROR:
1394 pr_warn("%s: unable to parse %s parameter\n",
1395 class_str, epdrv->pdrv->driver.name);
1396
1397 case EARLY_PLATFORM_ID_UNSET:
1398 match = NULL;
1399 break;
1400 default:
1401 match = early_platform_match(epdrv, match_id);
1402 }
1403
1404 if (match) {
1405
1406
1407
1408
1409
1410 if (!match->dev.init_name && slab_is_available()) {
1411 if (match->id != -1)
1412 match->dev.init_name =
1413 kasprintf(GFP_KERNEL, "%s.%d",
1414 match->name,
1415 match->id);
1416 else
1417 match->dev.init_name =
1418 kasprintf(GFP_KERNEL, "%s",
1419 match->name);
1420
1421 if (!match->dev.init_name)
1422 return -ENOMEM;
1423 }
1424
1425 if (epdrv->pdrv->probe(match))
1426 pr_warn("%s: unable to probe %s early.\n",
1427 class_str, match->name);
1428 else
1429 n++;
1430 }
1431
1432 if (n >= nr_probe)
1433 break;
1434 }
1435
1436 if (left)
1437 return n;
1438 else
1439 return -ENODEV;
1440}
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452int __init early_platform_driver_probe(char *class_str,
1453 int nr_probe,
1454 int user_only)
1455{
1456 int k, n, i;
1457
1458 n = 0;
1459 for (i = -2; n < nr_probe; i++) {
1460 k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
1461
1462 if (k < 0)
1463 break;
1464
1465 n += k;
1466
1467 if (user_only)
1468 break;
1469 }
1470
1471 return n;
1472}
1473
1474
1475
1476
1477void __init early_platform_cleanup(void)
1478{
1479 struct platform_device *pd, *pd2;
1480
1481
1482 list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
1483 dev.devres_head) {
1484 list_del(&pd->dev.devres_head);
1485 memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
1486 }
1487}
1488
1489