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>
10 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
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>
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 const struct of_device_id ibmebus_matches[] __initconst = {
59 { .compatible = "IBM,lhca" },
60 { .compatible = "IBM,lhea" },
64 static void *ibmebus_alloc_coherent(struct device *dev,
66 dma_addr_t *dma_handle,
68 struct dma_attrs *attrs)
72 mem = kmalloc(size, flag);
73 *dma_handle = (dma_addr_t)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)
86 static dma_addr_t ibmebus_map_page(struct device *dev,
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,
99 enum dma_data_direction direction,
100 struct dma_attrs *attrs)
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;
113 for_each_sg(sgl, sg, nents, i) {
114 sg->dma_address = (dma_addr_t) sg_virt(sg);
115 sg->dma_length = sg->length;
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)
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;
167 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
171 dev->dev.bus = &ibmebus_bus_type;
172 dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
174 ret = of_device_add(dev);
176 platform_device_put(dev);
180 static int ibmebus_create_devices(const struct of_device_id *matches)
182 struct device_node *root, *child;
186 root = of_find_node_by_path("/");
188 for_each_child_of_node(root, child) {
189 if (!of_match_node(matches, child))
192 dev = bus_find_device(&ibmebus_bus_type, NULL, child,
199 ret = ibmebus_create_device(child);
201 printk(KERN_ERR "%s: failed to create device (%i)",
212 int ibmebus_register_driver(struct platform_driver *drv)
214 /* If the driver uses devices that ibmebus doesn't know, add them */
215 ibmebus_create_devices(drv->driver.of_match_table);
217 drv->driver.bus = &ibmebus_bus_type;
218 return driver_register(&drv->driver);
220 EXPORT_SYMBOL(ibmebus_register_driver);
222 void ibmebus_unregister_driver(struct platform_driver *drv)
224 driver_unregister(&drv->driver);
226 EXPORT_SYMBOL(ibmebus_unregister_driver);
228 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
229 unsigned long irq_flags, const char *devname,
232 unsigned int irq = irq_create_mapping(NULL, ist);
237 return request_irq(irq, handler, irq_flags, devname, dev_id);
239 EXPORT_SYMBOL(ibmebus_request_irq);
241 void ibmebus_free_irq(u32 ist, void *dev_id)
243 unsigned int irq = irq_find_mapping(NULL, ist);
245 free_irq(irq, dev_id);
246 irq_dispose_mapping(irq);
248 EXPORT_SYMBOL(ibmebus_free_irq);
250 static char *ibmebus_chomp(const char *in, size_t count)
252 char *out = kmalloc(count + 1, GFP_KERNEL);
257 memcpy(out, in, count);
259 if (out[count - 1] == '\n')
260 out[count - 1] = '\0';
265 static ssize_t ibmebus_store_probe(struct bus_type *bus,
266 const char *buf, size_t count)
268 struct device_node *dn = NULL;
273 path = ibmebus_chomp(buf, count);
277 dev = bus_find_device(&ibmebus_bus_type, NULL, path,
281 printk(KERN_WARNING "%s: %s has already been probed\n",
287 if ((dn = of_find_node_by_path(path))) {
288 rc = ibmebus_create_device(dn);
291 printk(KERN_WARNING "%s: no such device node: %s\n",
302 static BUS_ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe);
304 static ssize_t ibmebus_store_remove(struct bus_type *bus,
305 const char *buf, size_t count)
310 path = ibmebus_chomp(buf, count);
314 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
315 ibmebus_match_path))) {
316 of_device_unregister(to_platform_device(dev));
322 printk(KERN_WARNING "%s: %s not on the bus\n",
329 static BUS_ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove);
331 static struct attribute *ibmbus_bus_attrs[] = {
332 &bus_attr_probe.attr,
333 &bus_attr_remove.attr,
336 ATTRIBUTE_GROUPS(ibmbus_bus);
338 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
340 const struct of_device_id *matches = drv->of_match_table;
345 return of_match_device(matches, dev) != NULL;
348 static int ibmebus_bus_device_probe(struct device *dev)
351 struct platform_driver *drv;
352 struct platform_device *of_dev;
354 drv = to_platform_driver(dev->driver);
355 of_dev = to_platform_device(dev);
362 if (of_driver_match_device(dev, dev->driver))
363 error = drv->probe(of_dev);
370 static int ibmebus_bus_device_remove(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->remove)
380 static void ibmebus_bus_device_shutdown(struct device *dev)
382 struct platform_device *of_dev = to_platform_device(dev);
383 struct platform_driver *drv = to_platform_driver(dev->driver);
385 if (dev->driver && drv->shutdown)
386 drv->shutdown(of_dev);
390 * ibmebus_bus_device_attrs
392 static ssize_t devspec_show(struct device *dev,
393 struct device_attribute *attr, char *buf)
395 struct platform_device *ofdev;
397 ofdev = to_platform_device(dev);
398 return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
401 static ssize_t name_show(struct device *dev,
402 struct device_attribute *attr, char *buf)
404 struct platform_device *ofdev;
406 ofdev = to_platform_device(dev);
407 return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
410 static ssize_t modalias_show(struct device *dev,
411 struct device_attribute *attr, char *buf)
413 ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
419 struct device_attribute ibmebus_bus_device_attrs[] = {
426 #ifdef CONFIG_PM_SLEEP
427 static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg)
429 struct platform_device *of_dev = to_platform_device(dev);
430 struct platform_driver *drv = to_platform_driver(dev->driver);
433 if (dev->driver && drv->suspend)
434 ret = drv->suspend(of_dev, mesg);
438 static int ibmebus_bus_legacy_resume(struct device *dev)
440 struct platform_device *of_dev = to_platform_device(dev);
441 struct platform_driver *drv = to_platform_driver(dev->driver);
444 if (dev->driver && drv->resume)
445 ret = drv->resume(of_dev);
449 static int ibmebus_bus_pm_prepare(struct device *dev)
451 struct device_driver *drv = dev->driver;
454 if (drv && drv->pm && drv->pm->prepare)
455 ret = drv->pm->prepare(dev);
460 static void ibmebus_bus_pm_complete(struct device *dev)
462 struct device_driver *drv = dev->driver;
464 if (drv && drv->pm && drv->pm->complete)
465 drv->pm->complete(dev);
468 #ifdef CONFIG_SUSPEND
470 static int ibmebus_bus_pm_suspend(struct device *dev)
472 struct device_driver *drv = dev->driver;
479 if (drv->pm->suspend)
480 ret = drv->pm->suspend(dev);
482 ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND);
488 static int ibmebus_bus_pm_suspend_noirq(struct device *dev)
490 struct device_driver *drv = dev->driver;
497 if (drv->pm->suspend_noirq)
498 ret = drv->pm->suspend_noirq(dev);
504 static int ibmebus_bus_pm_resume(struct device *dev)
506 struct device_driver *drv = dev->driver;
514 ret = drv->pm->resume(dev);
516 ret = ibmebus_bus_legacy_resume(dev);
522 static int ibmebus_bus_pm_resume_noirq(struct device *dev)
524 struct device_driver *drv = dev->driver;
531 if (drv->pm->resume_noirq)
532 ret = drv->pm->resume_noirq(dev);
538 #else /* !CONFIG_SUSPEND */
540 #define ibmebus_bus_pm_suspend NULL
541 #define ibmebus_bus_pm_resume NULL
542 #define ibmebus_bus_pm_suspend_noirq NULL
543 #define ibmebus_bus_pm_resume_noirq NULL
545 #endif /* !CONFIG_SUSPEND */
547 #ifdef CONFIG_HIBERNATE_CALLBACKS
549 static int ibmebus_bus_pm_freeze(struct device *dev)
551 struct device_driver *drv = dev->driver;
559 ret = drv->pm->freeze(dev);
561 ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE);
567 static int ibmebus_bus_pm_freeze_noirq(struct device *dev)
569 struct device_driver *drv = dev->driver;
576 if (drv->pm->freeze_noirq)
577 ret = drv->pm->freeze_noirq(dev);
583 static int ibmebus_bus_pm_thaw(struct device *dev)
585 struct device_driver *drv = dev->driver;
593 ret = drv->pm->thaw(dev);
595 ret = ibmebus_bus_legacy_resume(dev);
601 static int ibmebus_bus_pm_thaw_noirq(struct device *dev)
603 struct device_driver *drv = dev->driver;
610 if (drv->pm->thaw_noirq)
611 ret = drv->pm->thaw_noirq(dev);
617 static int ibmebus_bus_pm_poweroff(struct device *dev)
619 struct device_driver *drv = dev->driver;
626 if (drv->pm->poweroff)
627 ret = drv->pm->poweroff(dev);
629 ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE);
635 static int ibmebus_bus_pm_poweroff_noirq(struct device *dev)
637 struct device_driver *drv = dev->driver;
644 if (drv->pm->poweroff_noirq)
645 ret = drv->pm->poweroff_noirq(dev);
651 static int ibmebus_bus_pm_restore(struct device *dev)
653 struct device_driver *drv = dev->driver;
660 if (drv->pm->restore)
661 ret = drv->pm->restore(dev);
663 ret = ibmebus_bus_legacy_resume(dev);
669 static int ibmebus_bus_pm_restore_noirq(struct device *dev)
671 struct device_driver *drv = dev->driver;
678 if (drv->pm->restore_noirq)
679 ret = drv->pm->restore_noirq(dev);
685 #else /* !CONFIG_HIBERNATE_CALLBACKS */
687 #define ibmebus_bus_pm_freeze NULL
688 #define ibmebus_bus_pm_thaw NULL
689 #define ibmebus_bus_pm_poweroff NULL
690 #define ibmebus_bus_pm_restore NULL
691 #define ibmebus_bus_pm_freeze_noirq NULL
692 #define ibmebus_bus_pm_thaw_noirq NULL
693 #define ibmebus_bus_pm_poweroff_noirq NULL
694 #define ibmebus_bus_pm_restore_noirq NULL
696 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
698 static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
699 .prepare = ibmebus_bus_pm_prepare,
700 .complete = ibmebus_bus_pm_complete,
701 .suspend = ibmebus_bus_pm_suspend,
702 .resume = ibmebus_bus_pm_resume,
703 .freeze = ibmebus_bus_pm_freeze,
704 .thaw = ibmebus_bus_pm_thaw,
705 .poweroff = ibmebus_bus_pm_poweroff,
706 .restore = ibmebus_bus_pm_restore,
707 .suspend_noirq = ibmebus_bus_pm_suspend_noirq,
708 .resume_noirq = ibmebus_bus_pm_resume_noirq,
709 .freeze_noirq = ibmebus_bus_pm_freeze_noirq,
710 .thaw_noirq = ibmebus_bus_pm_thaw_noirq,
711 .poweroff_noirq = ibmebus_bus_pm_poweroff_noirq,
712 .restore_noirq = ibmebus_bus_pm_restore_noirq,
715 #define IBMEBUS_BUS_PM_OPS_PTR (&ibmebus_bus_dev_pm_ops)
717 #else /* !CONFIG_PM_SLEEP */
719 #define IBMEBUS_BUS_PM_OPS_PTR NULL
721 #endif /* !CONFIG_PM_SLEEP */
723 struct bus_type ibmebus_bus_type = {
725 .uevent = of_device_uevent_modalias,
726 .bus_groups = ibmbus_bus_groups,
727 .match = ibmebus_bus_bus_match,
728 .probe = ibmebus_bus_device_probe,
729 .remove = ibmebus_bus_device_remove,
730 .shutdown = ibmebus_bus_device_shutdown,
731 .dev_attrs = ibmebus_bus_device_attrs,
732 .pm = IBMEBUS_BUS_PM_OPS_PTR,
734 EXPORT_SYMBOL(ibmebus_bus_type);
736 static int __init ibmebus_bus_init(void)
740 printk(KERN_INFO "IBM eBus Device Driver\n");
742 err = bus_register(&ibmebus_bus_type);
744 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
749 err = device_register(&ibmebus_bus_device);
751 printk(KERN_WARNING "%s: device_register returned %i\n",
753 bus_unregister(&ibmebus_bus_type);
758 err = ibmebus_create_devices(ibmebus_matches);
760 device_unregister(&ibmebus_bus_device);
761 bus_unregister(&ibmebus_bus_type);
767 postcore_initcall(ibmebus_bus_init);