x86/efi: Enforce CONFIG_RELOCATABLE for EFI boot stub
[linux/fpc-iii.git] / arch / powerpc / kernel / ibmebus.c
blob16a7c2326d48d217b3f163777f3cfc473bb02fe1
1 /*
2 * IBM PowerPC IBM eBus Infrastructure Support.
4 * Copyright (c) 2005 IBM Corporation
5 * Joachim Fenkes <fenkes@de.ibm.com>
6 * Heiko J Schick <schickhj@de.ibm.com>
8 * All rights reserved.
10 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
11 * BSD.
13 * OpenIB BSD License
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions are met:
18 * Redistributions of source code must retain the above copyright notice, this
19 * list of conditions and the following disclaimer.
21 * Redistributions in binary form must reproduce the above copyright notice,
22 * this list of conditions and the following disclaimer in the documentation
23 * and/or other materials
24 * provided with the distribution.
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
33 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
34 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
39 #include <linux/init.h>
40 #include <linux/export.h>
41 #include <linux/console.h>
42 #include <linux/kobject.h>
43 #include <linux/dma-mapping.h>
44 #include <linux/interrupt.h>
45 #include <linux/of.h>
46 #include <linux/slab.h>
47 #include <linux/stat.h>
48 #include <linux/of_platform.h>
49 #include <asm/ibmebus.h>
51 static struct device ibmebus_bus_device = { /* fake "parent" device */
52 .init_name = "ibmebus",
55 struct bus_type ibmebus_bus_type;
57 /* These devices will automatically be added to the bus during init */
58 static struct of_device_id __initdata ibmebus_matches[] = {
59 { .compatible = "IBM,lhca" },
60 { .compatible = "IBM,lhea" },
61 {},
64 static void *ibmebus_alloc_coherent(struct device *dev,
65 size_t size,
66 dma_addr_t *dma_handle,
67 gfp_t flag,
68 struct dma_attrs *attrs)
70 void *mem;
72 mem = kmalloc(size, flag);
73 *dma_handle = (dma_addr_t)mem;
75 return mem;
78 static void ibmebus_free_coherent(struct device *dev,
79 size_t size, void *vaddr,
80 dma_addr_t dma_handle,
81 struct dma_attrs *attrs)
83 kfree(vaddr);
86 static dma_addr_t ibmebus_map_page(struct device *dev,
87 struct page *page,
88 unsigned long offset,
89 size_t size,
90 enum dma_data_direction direction,
91 struct dma_attrs *attrs)
93 return (dma_addr_t)(page_address(page) + offset);
96 static void ibmebus_unmap_page(struct device *dev,
97 dma_addr_t dma_addr,
98 size_t size,
99 enum dma_data_direction direction,
100 struct dma_attrs *attrs)
102 return;
105 static int ibmebus_map_sg(struct device *dev,
106 struct scatterlist *sgl,
107 int nents, enum dma_data_direction direction,
108 struct dma_attrs *attrs)
110 struct scatterlist *sg;
111 int i;
113 for_each_sg(sgl, sg, nents, i) {
114 sg->dma_address = (dma_addr_t) sg_virt(sg);
115 sg->dma_length = sg->length;
118 return nents;
121 static void ibmebus_unmap_sg(struct device *dev,
122 struct scatterlist *sg,
123 int nents, enum dma_data_direction direction,
124 struct dma_attrs *attrs)
126 return;
129 static int ibmebus_dma_supported(struct device *dev, u64 mask)
131 return mask == DMA_BIT_MASK(64);
134 static u64 ibmebus_dma_get_required_mask(struct device *dev)
136 return DMA_BIT_MASK(64);
139 static struct dma_map_ops ibmebus_dma_ops = {
140 .alloc = ibmebus_alloc_coherent,
141 .free = ibmebus_free_coherent,
142 .map_sg = ibmebus_map_sg,
143 .unmap_sg = ibmebus_unmap_sg,
144 .dma_supported = ibmebus_dma_supported,
145 .get_required_mask = ibmebus_dma_get_required_mask,
146 .map_page = ibmebus_map_page,
147 .unmap_page = ibmebus_unmap_page,
150 static int ibmebus_match_path(struct device *dev, void *data)
152 struct device_node *dn = to_platform_device(dev)->dev.of_node;
153 return (dn->full_name &&
154 (strcasecmp((char *)data, dn->full_name) == 0));
157 static int ibmebus_match_node(struct device *dev, void *data)
159 return to_platform_device(dev)->dev.of_node == data;
162 static int ibmebus_create_device(struct device_node *dn)
164 struct platform_device *dev;
165 int ret;
167 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
168 if (!dev)
169 return -ENOMEM;
171 dev->dev.bus = &ibmebus_bus_type;
172 dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
174 ret = of_device_add(dev);
175 if (ret)
176 platform_device_put(dev);
177 return ret;
180 static int ibmebus_create_devices(const struct of_device_id *matches)
182 struct device_node *root, *child;
183 int ret = 0;
185 root = of_find_node_by_path("/");
187 for_each_child_of_node(root, child) {
188 if (!of_match_node(matches, child))
189 continue;
191 if (bus_find_device(&ibmebus_bus_type, NULL, child,
192 ibmebus_match_node))
193 continue;
195 ret = ibmebus_create_device(child);
196 if (ret) {
197 printk(KERN_ERR "%s: failed to create device (%i)",
198 __func__, ret);
199 of_node_put(child);
200 break;
204 of_node_put(root);
205 return ret;
208 int ibmebus_register_driver(struct platform_driver *drv)
210 /* If the driver uses devices that ibmebus doesn't know, add them */
211 ibmebus_create_devices(drv->driver.of_match_table);
213 drv->driver.bus = &ibmebus_bus_type;
214 return driver_register(&drv->driver);
216 EXPORT_SYMBOL(ibmebus_register_driver);
218 void ibmebus_unregister_driver(struct platform_driver *drv)
220 driver_unregister(&drv->driver);
222 EXPORT_SYMBOL(ibmebus_unregister_driver);
224 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
225 unsigned long irq_flags, const char *devname,
226 void *dev_id)
228 unsigned int irq = irq_create_mapping(NULL, ist);
230 if (irq == NO_IRQ)
231 return -EINVAL;
233 return request_irq(irq, handler, irq_flags, devname, dev_id);
235 EXPORT_SYMBOL(ibmebus_request_irq);
237 void ibmebus_free_irq(u32 ist, void *dev_id)
239 unsigned int irq = irq_find_mapping(NULL, ist);
241 free_irq(irq, dev_id);
242 irq_dispose_mapping(irq);
244 EXPORT_SYMBOL(ibmebus_free_irq);
246 static char *ibmebus_chomp(const char *in, size_t count)
248 char *out = kmalloc(count + 1, GFP_KERNEL);
250 if (!out)
251 return NULL;
253 memcpy(out, in, count);
254 out[count] = '\0';
255 if (out[count - 1] == '\n')
256 out[count - 1] = '\0';
258 return out;
261 static ssize_t ibmebus_store_probe(struct bus_type *bus,
262 const char *buf, size_t count)
264 struct device_node *dn = NULL;
265 char *path;
266 ssize_t rc = 0;
268 path = ibmebus_chomp(buf, count);
269 if (!path)
270 return -ENOMEM;
272 if (bus_find_device(&ibmebus_bus_type, NULL, path,
273 ibmebus_match_path)) {
274 printk(KERN_WARNING "%s: %s has already been probed\n",
275 __func__, path);
276 rc = -EEXIST;
277 goto out;
280 if ((dn = of_find_node_by_path(path))) {
281 rc = ibmebus_create_device(dn);
282 of_node_put(dn);
283 } else {
284 printk(KERN_WARNING "%s: no such device node: %s\n",
285 __func__, path);
286 rc = -ENODEV;
289 out:
290 kfree(path);
291 if (rc)
292 return rc;
293 return count;
296 static ssize_t ibmebus_store_remove(struct bus_type *bus,
297 const char *buf, size_t count)
299 struct device *dev;
300 char *path;
302 path = ibmebus_chomp(buf, count);
303 if (!path)
304 return -ENOMEM;
306 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
307 ibmebus_match_path))) {
308 of_device_unregister(to_platform_device(dev));
310 kfree(path);
311 return count;
312 } else {
313 printk(KERN_WARNING "%s: %s not on the bus\n",
314 __func__, path);
316 kfree(path);
317 return -ENODEV;
322 static struct bus_attribute ibmebus_bus_attrs[] = {
323 __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
324 __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
325 __ATTR_NULL
328 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
330 const struct of_device_id *matches = drv->of_match_table;
332 if (!matches)
333 return 0;
335 return of_match_device(matches, dev) != NULL;
338 static int ibmebus_bus_device_probe(struct device *dev)
340 int error = -ENODEV;
341 struct platform_driver *drv;
342 struct platform_device *of_dev;
344 drv = to_platform_driver(dev->driver);
345 of_dev = to_platform_device(dev);
347 if (!drv->probe)
348 return error;
350 of_dev_get(of_dev);
352 if (of_driver_match_device(dev, dev->driver))
353 error = drv->probe(of_dev);
354 if (error)
355 of_dev_put(of_dev);
357 return error;
360 static int ibmebus_bus_device_remove(struct device *dev)
362 struct platform_device *of_dev = to_platform_device(dev);
363 struct platform_driver *drv = to_platform_driver(dev->driver);
365 if (dev->driver && drv->remove)
366 drv->remove(of_dev);
367 return 0;
370 static void ibmebus_bus_device_shutdown(struct device *dev)
372 struct platform_device *of_dev = to_platform_device(dev);
373 struct platform_driver *drv = to_platform_driver(dev->driver);
375 if (dev->driver && drv->shutdown)
376 drv->shutdown(of_dev);
380 * ibmebus_bus_device_attrs
382 static ssize_t devspec_show(struct device *dev,
383 struct device_attribute *attr, char *buf)
385 struct platform_device *ofdev;
387 ofdev = to_platform_device(dev);
388 return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
391 static ssize_t name_show(struct device *dev,
392 struct device_attribute *attr, char *buf)
394 struct platform_device *ofdev;
396 ofdev = to_platform_device(dev);
397 return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
400 static ssize_t modalias_show(struct device *dev,
401 struct device_attribute *attr, char *buf)
403 ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
404 buf[len] = '\n';
405 buf[len+1] = 0;
406 return len+1;
409 struct device_attribute ibmebus_bus_device_attrs[] = {
410 __ATTR_RO(devspec),
411 __ATTR_RO(name),
412 __ATTR_RO(modalias),
413 __ATTR_NULL
416 #ifdef CONFIG_PM_SLEEP
417 static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg)
419 struct platform_device *of_dev = to_platform_device(dev);
420 struct platform_driver *drv = to_platform_driver(dev->driver);
421 int ret = 0;
423 if (dev->driver && drv->suspend)
424 ret = drv->suspend(of_dev, mesg);
425 return ret;
428 static int ibmebus_bus_legacy_resume(struct device *dev)
430 struct platform_device *of_dev = to_platform_device(dev);
431 struct platform_driver *drv = to_platform_driver(dev->driver);
432 int ret = 0;
434 if (dev->driver && drv->resume)
435 ret = drv->resume(of_dev);
436 return ret;
439 static int ibmebus_bus_pm_prepare(struct device *dev)
441 struct device_driver *drv = dev->driver;
442 int ret = 0;
444 if (drv && drv->pm && drv->pm->prepare)
445 ret = drv->pm->prepare(dev);
447 return ret;
450 static void ibmebus_bus_pm_complete(struct device *dev)
452 struct device_driver *drv = dev->driver;
454 if (drv && drv->pm && drv->pm->complete)
455 drv->pm->complete(dev);
458 #ifdef CONFIG_SUSPEND
460 static int ibmebus_bus_pm_suspend(struct device *dev)
462 struct device_driver *drv = dev->driver;
463 int ret = 0;
465 if (!drv)
466 return 0;
468 if (drv->pm) {
469 if (drv->pm->suspend)
470 ret = drv->pm->suspend(dev);
471 } else {
472 ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND);
475 return ret;
478 static int ibmebus_bus_pm_suspend_noirq(struct device *dev)
480 struct device_driver *drv = dev->driver;
481 int ret = 0;
483 if (!drv)
484 return 0;
486 if (drv->pm) {
487 if (drv->pm->suspend_noirq)
488 ret = drv->pm->suspend_noirq(dev);
491 return ret;
494 static int ibmebus_bus_pm_resume(struct device *dev)
496 struct device_driver *drv = dev->driver;
497 int ret = 0;
499 if (!drv)
500 return 0;
502 if (drv->pm) {
503 if (drv->pm->resume)
504 ret = drv->pm->resume(dev);
505 } else {
506 ret = ibmebus_bus_legacy_resume(dev);
509 return ret;
512 static int ibmebus_bus_pm_resume_noirq(struct device *dev)
514 struct device_driver *drv = dev->driver;
515 int ret = 0;
517 if (!drv)
518 return 0;
520 if (drv->pm) {
521 if (drv->pm->resume_noirq)
522 ret = drv->pm->resume_noirq(dev);
525 return ret;
528 #else /* !CONFIG_SUSPEND */
530 #define ibmebus_bus_pm_suspend NULL
531 #define ibmebus_bus_pm_resume NULL
532 #define ibmebus_bus_pm_suspend_noirq NULL
533 #define ibmebus_bus_pm_resume_noirq NULL
535 #endif /* !CONFIG_SUSPEND */
537 #ifdef CONFIG_HIBERNATE_CALLBACKS
539 static int ibmebus_bus_pm_freeze(struct device *dev)
541 struct device_driver *drv = dev->driver;
542 int ret = 0;
544 if (!drv)
545 return 0;
547 if (drv->pm) {
548 if (drv->pm->freeze)
549 ret = drv->pm->freeze(dev);
550 } else {
551 ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE);
554 return ret;
557 static int ibmebus_bus_pm_freeze_noirq(struct device *dev)
559 struct device_driver *drv = dev->driver;
560 int ret = 0;
562 if (!drv)
563 return 0;
565 if (drv->pm) {
566 if (drv->pm->freeze_noirq)
567 ret = drv->pm->freeze_noirq(dev);
570 return ret;
573 static int ibmebus_bus_pm_thaw(struct device *dev)
575 struct device_driver *drv = dev->driver;
576 int ret = 0;
578 if (!drv)
579 return 0;
581 if (drv->pm) {
582 if (drv->pm->thaw)
583 ret = drv->pm->thaw(dev);
584 } else {
585 ret = ibmebus_bus_legacy_resume(dev);
588 return ret;
591 static int ibmebus_bus_pm_thaw_noirq(struct device *dev)
593 struct device_driver *drv = dev->driver;
594 int ret = 0;
596 if (!drv)
597 return 0;
599 if (drv->pm) {
600 if (drv->pm->thaw_noirq)
601 ret = drv->pm->thaw_noirq(dev);
604 return ret;
607 static int ibmebus_bus_pm_poweroff(struct device *dev)
609 struct device_driver *drv = dev->driver;
610 int ret = 0;
612 if (!drv)
613 return 0;
615 if (drv->pm) {
616 if (drv->pm->poweroff)
617 ret = drv->pm->poweroff(dev);
618 } else {
619 ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE);
622 return ret;
625 static int ibmebus_bus_pm_poweroff_noirq(struct device *dev)
627 struct device_driver *drv = dev->driver;
628 int ret = 0;
630 if (!drv)
631 return 0;
633 if (drv->pm) {
634 if (drv->pm->poweroff_noirq)
635 ret = drv->pm->poweroff_noirq(dev);
638 return ret;
641 static int ibmebus_bus_pm_restore(struct device *dev)
643 struct device_driver *drv = dev->driver;
644 int ret = 0;
646 if (!drv)
647 return 0;
649 if (drv->pm) {
650 if (drv->pm->restore)
651 ret = drv->pm->restore(dev);
652 } else {
653 ret = ibmebus_bus_legacy_resume(dev);
656 return ret;
659 static int ibmebus_bus_pm_restore_noirq(struct device *dev)
661 struct device_driver *drv = dev->driver;
662 int ret = 0;
664 if (!drv)
665 return 0;
667 if (drv->pm) {
668 if (drv->pm->restore_noirq)
669 ret = drv->pm->restore_noirq(dev);
672 return ret;
675 #else /* !CONFIG_HIBERNATE_CALLBACKS */
677 #define ibmebus_bus_pm_freeze NULL
678 #define ibmebus_bus_pm_thaw NULL
679 #define ibmebus_bus_pm_poweroff NULL
680 #define ibmebus_bus_pm_restore NULL
681 #define ibmebus_bus_pm_freeze_noirq NULL
682 #define ibmebus_bus_pm_thaw_noirq NULL
683 #define ibmebus_bus_pm_poweroff_noirq NULL
684 #define ibmebus_bus_pm_restore_noirq NULL
686 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
688 static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
689 .prepare = ibmebus_bus_pm_prepare,
690 .complete = ibmebus_bus_pm_complete,
691 .suspend = ibmebus_bus_pm_suspend,
692 .resume = ibmebus_bus_pm_resume,
693 .freeze = ibmebus_bus_pm_freeze,
694 .thaw = ibmebus_bus_pm_thaw,
695 .poweroff = ibmebus_bus_pm_poweroff,
696 .restore = ibmebus_bus_pm_restore,
697 .suspend_noirq = ibmebus_bus_pm_suspend_noirq,
698 .resume_noirq = ibmebus_bus_pm_resume_noirq,
699 .freeze_noirq = ibmebus_bus_pm_freeze_noirq,
700 .thaw_noirq = ibmebus_bus_pm_thaw_noirq,
701 .poweroff_noirq = ibmebus_bus_pm_poweroff_noirq,
702 .restore_noirq = ibmebus_bus_pm_restore_noirq,
705 #define IBMEBUS_BUS_PM_OPS_PTR (&ibmebus_bus_dev_pm_ops)
707 #else /* !CONFIG_PM_SLEEP */
709 #define IBMEBUS_BUS_PM_OPS_PTR NULL
711 #endif /* !CONFIG_PM_SLEEP */
713 struct bus_type ibmebus_bus_type = {
714 .name = "ibmebus",
715 .uevent = of_device_uevent_modalias,
716 .bus_attrs = ibmebus_bus_attrs,
717 .match = ibmebus_bus_bus_match,
718 .probe = ibmebus_bus_device_probe,
719 .remove = ibmebus_bus_device_remove,
720 .shutdown = ibmebus_bus_device_shutdown,
721 .dev_attrs = ibmebus_bus_device_attrs,
722 .pm = IBMEBUS_BUS_PM_OPS_PTR,
724 EXPORT_SYMBOL(ibmebus_bus_type);
726 static int __init ibmebus_bus_init(void)
728 int err;
730 printk(KERN_INFO "IBM eBus Device Driver\n");
732 err = bus_register(&ibmebus_bus_type);
733 if (err) {
734 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
735 __func__);
736 return err;
739 err = device_register(&ibmebus_bus_device);
740 if (err) {
741 printk(KERN_WARNING "%s: device_register returned %i\n",
742 __func__, err);
743 bus_unregister(&ibmebus_bus_type);
745 return err;
748 err = ibmebus_create_devices(ibmebus_matches);
749 if (err) {
750 device_unregister(&ibmebus_bus_device);
751 bus_unregister(&ibmebus_bus_type);
752 return err;
755 return 0;
757 postcore_initcall(ibmebus_bus_init);