1 /*
2  * Bus & driver management routines for devices within
3  * a MacIO ASIC. Interface to new driver model mostly
4  * stolen from the PCI version.
5  *
6  *  Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
7  *
8  *  This program is free software; you can redistribute it and/or
9  *  modify it under the terms of the GNU General Public License
10  *  as published by the Free Software Foundation; either version
11  *  2 of the License, or (at your option) any later version.
12  *
13  * TODO:
14  *
15  *  - Don't probe below media bay by default, but instead provide
16  *    some hooks for media bay to dynamically add/remove it's own
17  *    sub-devices.
18  */
19 
20 #include <linux/string.h>
21 #include <linux/kernel.h>
22 #include <linux/pci.h>
23 #include <linux/pci_ids.h>
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <linux/of_address.h>
28 #include <linux/of_irq.h>
29 
30 #include <asm/machdep.h>
31 #include <asm/macio.h>
32 #include <asm/pmac_feature.h>
33 #include <asm/prom.h>
34 
35 #undef DEBUG
36 
37 #define MAX_NODE_NAME_SIZE (20 - 12)
38 
39 static struct macio_chip      *macio_on_hold;
40 
41 static int macio_bus_match(struct device *dev, struct device_driver *drv)
42 {
43 	const struct of_device_id * matches = drv->of_match_table;
44 
45 	if (!matches)
46 		return 0;
47 
48 	return of_match_device(matches, dev) != NULL;
49 }
50 
51 struct macio_dev *macio_dev_get(struct macio_dev *dev)
52 {
53 	struct device *tmp;
54 
55 	if (!dev)
56 		return NULL;
57 	tmp = get_device(&dev->ofdev.dev);
58 	if (tmp)
59 		return to_macio_device(tmp);
60 	else
61 		return NULL;
62 }
63 
64 void macio_dev_put(struct macio_dev *dev)
65 {
66 	if (dev)
67 		put_device(&dev->ofdev.dev);
68 }
69 
70 
71 static int macio_device_probe(struct device *dev)
72 {
73 	int error = -ENODEV;
74 	struct macio_driver *drv;
75 	struct macio_dev *macio_dev;
76 	const struct of_device_id *match;
77 
78 	drv = to_macio_driver(dev->driver);
79 	macio_dev = to_macio_device(dev);
80 
81 	if (!drv->probe)
82 		return error;
83 
84 	macio_dev_get(macio_dev);
85 
86 	match = of_match_device(drv->driver.of_match_table, dev);
87 	if (match)
88 		error = drv->probe(macio_dev, match);
89 	if (error)
90 		macio_dev_put(macio_dev);
91 
92 	return error;
93 }
94 
95 static int macio_device_remove(struct device *dev)
96 {
97 	struct macio_dev * macio_dev = to_macio_device(dev);
98 	struct macio_driver * drv = to_macio_driver(dev->driver);
99 
100 	if (dev->driver && drv->remove)
101 		drv->remove(macio_dev);
102 	macio_dev_put(macio_dev);
103 
104 	return 0;
105 }
106 
107 static void macio_device_shutdown(struct device *dev)
108 {
109 	struct macio_dev * macio_dev = to_macio_device(dev);
110 	struct macio_driver * drv = to_macio_driver(dev->driver);
111 
112 	if (dev->driver && drv->shutdown)
113 		drv->shutdown(macio_dev);
114 }
115 
116 static int macio_device_suspend(struct device *dev, pm_message_t state)
117 {
118 	struct macio_dev * macio_dev = to_macio_device(dev);
119 	struct macio_driver * drv = to_macio_driver(dev->driver);
120 
121 	if (dev->driver && drv->suspend)
122 		return drv->suspend(macio_dev, state);
123 	return 0;
124 }
125 
126 static int macio_device_resume(struct device * dev)
127 {
128 	struct macio_dev * macio_dev = to_macio_device(dev);
129 	struct macio_driver * drv = to_macio_driver(dev->driver);
130 
131 	if (dev->driver && drv->resume)
132 		return drv->resume(macio_dev);
133 	return 0;
134 }
135 
136 extern const struct attribute_group *macio_dev_groups[];
137 
138 struct bus_type macio_bus_type = {
139        .name	= "macio",
140        .match	= macio_bus_match,
141        .uevent = of_device_uevent_modalias,
142        .probe	= macio_device_probe,
143        .remove	= macio_device_remove,
144        .shutdown = macio_device_shutdown,
145        .suspend	= macio_device_suspend,
146        .resume	= macio_device_resume,
147        .dev_groups = macio_dev_groups,
148 };
149 
150 static int __init macio_bus_driver_init(void)
151 {
152 	return bus_register(&macio_bus_type);
153 }
154 
155 postcore_initcall(macio_bus_driver_init);
156 
157 
158 /**
159  * macio_release_dev - free a macio device structure when all users of it are
160  * finished.
161  * @dev: device that's been disconnected
162  *
163  * Will be called only by the device core when all users of this macio device
164  * are done. This currently means never as we don't hot remove any macio
165  * device yet, though that will happen with mediabay based devices in a later
166  * implementation.
167  */
168 static void macio_release_dev(struct device *dev)
169 {
170 	struct macio_dev *mdev;
171 
172         mdev = to_macio_device(dev);
173 	kfree(mdev);
174 }
175 
176 /**
177  * macio_resource_quirks - tweak or skip some resources for a device
178  * @np: pointer to the device node
179  * @res: resulting resource
180  * @index: index of resource in node
181  *
182  * If this routine returns non-null, then the resource is completely
183  * skipped.
184  */
185 static int macio_resource_quirks(struct device_node *np, struct resource *res,
186 				 int index)
187 {
188 	/* Only quirks for memory resources for now */
189 	if ((res->flags & IORESOURCE_MEM) == 0)
190 		return 0;
191 
192 	/* Grand Central has too large resource 0 on some machines */
193 	if (index == 0 && !strcmp(np->name, "gc"))
194 		res->end = res->start + 0x1ffff;
195 
196 	/* Airport has bogus resource 2 */
197 	if (index >= 2 && !strcmp(np->name, "radio"))
198 		return 1;
199 
200 #ifndef CONFIG_PPC64
201 	/* DBDMAs may have bogus sizes */
202 	if ((res->start & 0x0001f000) == 0x00008000)
203 		res->end = res->start + 0xff;
204 #endif /* CONFIG_PPC64 */
205 
206 	/* ESCC parent eats child resources. We could have added a
207 	 * level of hierarchy, but I don't really feel the need
208 	 * for it
209 	 */
210 	if (!strcmp(np->name, "escc"))
211 		return 1;
212 
213 	/* ESCC has bogus resources >= 3 */
214 	if (index >= 3 && !(strcmp(np->name, "ch-a") &&
215 			    strcmp(np->name, "ch-b")))
216 		return 1;
217 
218 	/* Media bay has too many resources, keep only first one */
219 	if (index > 0 && !strcmp(np->name, "media-bay"))
220 		return 1;
221 
222 	/* Some older IDE resources have bogus sizes */
223 	if (!(strcmp(np->name, "IDE") && strcmp(np->name, "ATA") &&
224 	      strcmp(np->type, "ide") && strcmp(np->type, "ata"))) {
225 		if (index == 0 && (res->end - res->start) > 0xfff)
226 			res->end = res->start + 0xfff;
227 		if (index == 1 && (res->end - res->start) > 0xff)
228 			res->end = res->start + 0xff;
229 	}
230 	return 0;
231 }
232 
233 static void macio_create_fixup_irq(struct macio_dev *dev, int index,
234 				   unsigned int line)
235 {
236 	unsigned int irq;
237 
238 	irq = irq_create_mapping(NULL, line);
239 	if (!irq) {
240 		dev->interrupt[index].start = irq;
241 		dev->interrupt[index].flags = IORESOURCE_IRQ;
242 		dev->interrupt[index].name = dev_name(&dev->ofdev.dev);
243 	}
244 	if (dev->n_interrupts <= index)
245 		dev->n_interrupts = index + 1;
246 }
247 
248 static void macio_add_missing_resources(struct macio_dev *dev)
249 {
250 	struct device_node *np = dev->ofdev.dev.of_node;
251 	unsigned int irq_base;
252 
253 	/* Gatwick has some missing interrupts on child nodes */
254 	if (dev->bus->chip->type != macio_gatwick)
255 		return;
256 
257 	/* irq_base is always 64 on gatwick. I have no cleaner way to get
258 	 * that value from here at this point
259 	 */
260 	irq_base = 64;
261 
262 	/* Fix SCC */
263 	if (strcmp(np->name, "ch-a") == 0) {
264 		macio_create_fixup_irq(dev, 0, 15 + irq_base);
265 		macio_create_fixup_irq(dev, 1,  4 + irq_base);
266 		macio_create_fixup_irq(dev, 2,  5 + irq_base);
267 		printk(KERN_INFO "macio: fixed SCC irqs on gatwick\n");
268 	}
269 
270 	/* Fix media-bay */
271 	if (strcmp(np->name, "media-bay") == 0) {
272 		macio_create_fixup_irq(dev, 0, 29 + irq_base);
273 		printk(KERN_INFO "macio: fixed media-bay irq on gatwick\n");
274 	}
275 
276 	/* Fix left media bay childs */
277 	if (dev->media_bay != NULL && strcmp(np->name, "floppy") == 0) {
278 		macio_create_fixup_irq(dev, 0, 19 + irq_base);
279 		macio_create_fixup_irq(dev, 1,  1 + irq_base);
280 		printk(KERN_INFO "macio: fixed left floppy irqs\n");
281 	}
282 	if (dev->media_bay != NULL && strcasecmp(np->name, "ata4") == 0) {
283 		macio_create_fixup_irq(dev, 0, 14 + irq_base);
284 		macio_create_fixup_irq(dev, 0,  3 + irq_base);
285 		printk(KERN_INFO "macio: fixed left ide irqs\n");
286 	}
287 }
288 
289 static void macio_setup_interrupts(struct macio_dev *dev)
290 {
291 	struct device_node *np = dev->ofdev.dev.of_node;
292 	unsigned int irq;
293 	int i = 0, j = 0;
294 
295 	for (;;) {
296 		struct resource *res;
297 
298 		if (j >= MACIO_DEV_COUNT_IRQS)
299 			break;
300 		res = &dev->interrupt[j];
301 		irq = irq_of_parse_and_map(np, i++);
302 		if (!irq)
303 			break;
304 		res->start = irq;
305 		res->flags = IORESOURCE_IRQ;
306 		res->name = dev_name(&dev->ofdev.dev);
307 		if (macio_resource_quirks(np, res, i - 1)) {
308 			memset(res, 0, sizeof(struct resource));
309 			continue;
310 		} else
311 			j++;
312 	}
313 	dev->n_interrupts = j;
314 }
315 
316 static void macio_setup_resources(struct macio_dev *dev,
317 				  struct resource *parent_res)
318 {
319 	struct device_node *np = dev->ofdev.dev.of_node;
320 	struct resource r;
321 	int index;
322 
323 	for (index = 0; of_address_to_resource(np, index, &r) == 0; index++) {
324 		struct resource *res;
325 		if (index >= MACIO_DEV_COUNT_RESOURCES)
326 			break;
327 		res = &dev->resource[index];
328 		*res = r;
329 		res->name = dev_name(&dev->ofdev.dev);
330 
331 		if (macio_resource_quirks(np, res, index)) {
332 			memset(res, 0, sizeof(struct resource));
333 			continue;
334 		}
335 		/* Currently, we consider failure as harmless, this may
336 		 * change in the future, once I've found all the device
337 		 * tree bugs in older machines & worked around them
338 		 */
339 		if (insert_resource(parent_res, res)) {
340 			printk(KERN_WARNING "Can't request resource "
341 			       "%d for MacIO device %s\n",
342 			       index, dev_name(&dev->ofdev.dev));
343 		}
344 	}
345 	dev->n_resources = index;
346 }
347 
348 /**
349  * macio_add_one_device - Add one device from OF node to the device tree
350  * @chip: pointer to the macio_chip holding the device
351  * @np: pointer to the device node in the OF tree
352  * @in_bay: set to 1 if device is part of a media-bay
353  *
354  * When media-bay is changed to hotswap drivers, this function will
355  * be exposed to the bay driver some way...
356  */
357 static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
358 					       struct device *parent,
359 					       struct device_node *np,
360 					       struct macio_dev *in_bay,
361 					       struct resource *parent_res)
362 {
363 	struct macio_dev *dev;
364 	const u32 *reg;
365 
366 	if (np == NULL)
367 		return NULL;
368 
369 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
370 	if (!dev)
371 		return NULL;
372 
373 	dev->bus = &chip->lbus;
374 	dev->media_bay = in_bay;
375 	dev->ofdev.dev.of_node = np;
376 	dev->ofdev.archdata.dma_mask = 0xffffffffUL;
377 	dev->ofdev.dev.dma_mask = &dev->ofdev.archdata.dma_mask;
378 	dev->ofdev.dev.coherent_dma_mask = dev->ofdev.archdata.dma_mask;
379 	dev->ofdev.dev.parent = parent;
380 	dev->ofdev.dev.bus = &macio_bus_type;
381 	dev->ofdev.dev.release = macio_release_dev;
382 	dev->ofdev.dev.dma_parms = &dev->dma_parms;
383 
384 	/* Standard DMA paremeters */
385 	dma_set_max_seg_size(&dev->ofdev.dev, 65536);
386 	dma_set_seg_boundary(&dev->ofdev.dev, 0xffffffff);
387 
388 #ifdef CONFIG_PCI
389 	/* Set the DMA ops to the ones from the PCI device, this could be
390 	 * fishy if we didn't know that on PowerMac it's always direct ops
391 	 * or iommu ops that will work fine
392 	 *
393 	 * To get all the fields, copy all archdata
394 	 */
395 	dev->ofdev.dev.archdata = chip->lbus.pdev->dev.archdata;
396 	dev->ofdev.dev.dma_ops = chip->lbus.pdev->dev.dma_ops;
397 #endif /* CONFIG_PCI */
398 
399 #ifdef DEBUG
400 	printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n",
401 	       dev, &dev->ofdev, &dev->ofdev.dev, &dev->ofdev.dev.kobj);
402 #endif
403 
404 	/* MacIO itself has a different reg, we use it's PCI base */
405 	if (np == chip->of_node) {
406 		dev_set_name(&dev->ofdev.dev, "%1d.%08x:%.*s",
407 			     chip->lbus.index,
408 #ifdef CONFIG_PCI
409 			(unsigned int)pci_resource_start(chip->lbus.pdev, 0),
410 #else
411 			0, /* NuBus may want to do something better here */
412 #endif
413 			MAX_NODE_NAME_SIZE, np->name);
414 	} else {
415 		reg = of_get_property(np, "reg", NULL);
416 		dev_set_name(&dev->ofdev.dev, "%1d.%08x:%.*s",
417 			     chip->lbus.index,
418 			     reg ? *reg : 0, MAX_NODE_NAME_SIZE, np->name);
419 	}
420 
421 	/* Setup interrupts & resources */
422 	macio_setup_interrupts(dev);
423 	macio_setup_resources(dev, parent_res);
424 	macio_add_missing_resources(dev);
425 
426 	/* Register with core */
427 	if (of_device_register(&dev->ofdev) != 0) {
428 		printk(KERN_DEBUG"macio: device registration error for %s!\n",
429 		       dev_name(&dev->ofdev.dev));
430 		kfree(dev);
431 		return NULL;
432 	}
433 
434 	return dev;
435 }
436 
437 static int macio_skip_device(struct device_node *np)
438 {
439 	if (strncmp(np->name, "battery", 7) == 0)
440 		return 1;
441 	if (strncmp(np->name, "escc-legacy", 11) == 0)
442 		return 1;
443 	return 0;
444 }
445 
446 /**
447  * macio_pci_add_devices - Adds sub-devices of mac-io to the device tree
448  * @chip: pointer to the macio_chip holding the devices
449  *
450  * This function will do the job of extracting devices from the
451  * Open Firmware device tree, build macio_dev structures and add
452  * them to the Linux device tree.
453  *
454  * For now, childs of media-bay are added now as well. This will
455  * change rsn though.
456  */
457 static void macio_pci_add_devices(struct macio_chip *chip)
458 {
459 	struct device_node *np, *pnode;
460 	struct macio_dev *rdev, *mdev, *mbdev = NULL, *sdev = NULL;
461 	struct device *parent = NULL;
462 	struct resource *root_res = &iomem_resource;
463 
464 	/* Add a node for the macio bus itself */
465 #ifdef CONFIG_PCI
466 	if (chip->lbus.pdev) {
467 		parent = &chip->lbus.pdev->dev;
468 		root_res = &chip->lbus.pdev->resource[0];
469 	}
470 #endif
471 	pnode = of_node_get(chip->of_node);
472 	if (pnode == NULL)
473 		return;
474 
475 	/* Add macio itself to hierarchy */
476 	rdev = macio_add_one_device(chip, parent, pnode, NULL, root_res);
477 	if (rdev == NULL)
478 		return;
479 	root_res = &rdev->resource[0];
480 
481 	/* First scan 1st level */
482 	for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
483 		if (macio_skip_device(np))
484 			continue;
485 		of_node_get(np);
486 		mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL,
487 					    root_res);
488 		if (mdev == NULL)
489 			of_node_put(np);
490 		else if (strncmp(np->name, "media-bay", 9) == 0)
491 			mbdev = mdev;
492 		else if (strncmp(np->name, "escc", 4) == 0)
493 			sdev = mdev;
494 	}
495 
496 	/* Add media bay devices if any */
497 	if (mbdev) {
498 		pnode = mbdev->ofdev.dev.of_node;
499 		for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
500 			if (macio_skip_device(np))
501 				continue;
502 			of_node_get(np);
503 			if (macio_add_one_device(chip, &mbdev->ofdev.dev, np,
504 						 mbdev,  root_res) == NULL)
505 				of_node_put(np);
506 		}
507 	}
508 
509 	/* Add serial ports if any */
510 	if (sdev) {
511 		pnode = sdev->ofdev.dev.of_node;
512 		for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
513 			if (macio_skip_device(np))
514 				continue;
515 			of_node_get(np);
516 			if (macio_add_one_device(chip, &sdev->ofdev.dev, np,
517 						 NULL, root_res) == NULL)
518 				of_node_put(np);
519 		}
520 	}
521 }
522 
523 
524 /**
525  * macio_register_driver - Registers a new MacIO device driver
526  * @drv: pointer to the driver definition structure
527  */
528 int macio_register_driver(struct macio_driver *drv)
529 {
530 	/* initialize common driver fields */
531 	drv->driver.bus = &macio_bus_type;
532 
533 	/* register with core */
534 	return driver_register(&drv->driver);
535 }
536 
537 /**
538  * macio_unregister_driver - Unregisters a new MacIO device driver
539  * @drv: pointer to the driver definition structure
540  */
541 void macio_unregister_driver(struct macio_driver *drv)
542 {
543 	driver_unregister(&drv->driver);
544 }
545 
546 /* Managed MacIO resources */
547 struct macio_devres {
548 	u32	res_mask;
549 };
550 
551 static void maciom_release(struct device *gendev, void *res)
552 {
553 	struct macio_dev *dev = to_macio_device(gendev);
554 	struct macio_devres *dr = res;
555 	int i, max;
556 
557 	max = min(dev->n_resources, 32);
558 	for (i = 0; i < max; i++) {
559 		if (dr->res_mask & (1 << i))
560 			macio_release_resource(dev, i);
561 	}
562 }
563 
564 int macio_enable_devres(struct macio_dev *dev)
565 {
566 	struct macio_devres *dr;
567 
568 	dr = devres_find(&dev->ofdev.dev, maciom_release, NULL, NULL);
569 	if (!dr) {
570 		dr = devres_alloc(maciom_release, sizeof(*dr), GFP_KERNEL);
571 		if (!dr)
572 			return -ENOMEM;
573 	}
574 	return devres_get(&dev->ofdev.dev, dr, NULL, NULL) != NULL;
575 }
576 
577 static struct macio_devres * find_macio_dr(struct macio_dev *dev)
578 {
579 	return devres_find(&dev->ofdev.dev, maciom_release, NULL, NULL);
580 }
581 
582 /**
583  *	macio_request_resource - Request an MMIO resource
584  * 	@dev: pointer to the device holding the resource
585  *	@resource_no: resource number to request
586  *	@name: resource name
587  *
588  *	Mark  memory region number @resource_no associated with MacIO
589  *	device @dev as being reserved by owner @name.  Do not access
590  *	any address inside the memory regions unless this call returns
591  *	successfully.
592  *
593  *	Returns 0 on success, or %EBUSY on error.  A warning
594  *	message is also printed on failure.
595  */
596 int macio_request_resource(struct macio_dev *dev, int resource_no,
597 			   const char *name)
598 {
599 	struct macio_devres *dr = find_macio_dr(dev);
600 
601 	if (macio_resource_len(dev, resource_no) == 0)
602 		return 0;
603 
604 	if (!request_mem_region(macio_resource_start(dev, resource_no),
605 				macio_resource_len(dev, resource_no),
606 				name))
607 		goto err_out;
608 
609 	if (dr && resource_no < 32)
610 		dr->res_mask |= 1 << resource_no;
611 
612 	return 0;
613 
614 err_out:
615 	printk (KERN_WARNING "MacIO: Unable to reserve resource #%d:%lx@%lx"
616 		" for device %s\n",
617 		resource_no,
618 		macio_resource_len(dev, resource_no),
619 		macio_resource_start(dev, resource_no),
620 		dev_name(&dev->ofdev.dev));
621 	return -EBUSY;
622 }
623 
624 /**
625  * macio_release_resource - Release an MMIO resource
626  * @dev: pointer to the device holding the resource
627  * @resource_no: resource number to release
628  */
629 void macio_release_resource(struct macio_dev *dev, int resource_no)
630 {
631 	struct macio_devres *dr = find_macio_dr(dev);
632 
633 	if (macio_resource_len(dev, resource_no) == 0)
634 		return;
635 	release_mem_region(macio_resource_start(dev, resource_no),
636 			   macio_resource_len(dev, resource_no));
637 	if (dr && resource_no < 32)
638 		dr->res_mask &= ~(1 << resource_no);
639 }
640 
641 /**
642  *	macio_request_resources - Reserve all memory resources
643  *	@dev: MacIO device whose resources are to be reserved
644  *	@name: Name to be associated with resource.
645  *
646  *	Mark all memory regions associated with MacIO device @dev as
647  *	being reserved by owner @name.  Do not access any address inside
648  *	the memory regions unless this call returns successfully.
649  *
650  *	Returns 0 on success, or %EBUSY on error.  A warning
651  *	message is also printed on failure.
652  */
653 int macio_request_resources(struct macio_dev *dev, const char *name)
654 {
655 	int i;
656 
657 	for (i = 0; i < dev->n_resources; i++)
658 		if (macio_request_resource(dev, i, name))
659 			goto err_out;
660 	return 0;
661 
662 err_out:
663 	while(--i >= 0)
664 		macio_release_resource(dev, i);
665 
666 	return -EBUSY;
667 }
668 
669 /**
670  *	macio_release_resources - Release reserved memory resources
671  *	@dev: MacIO device whose resources were previously reserved
672  */
673 
674 void macio_release_resources(struct macio_dev *dev)
675 {
676 	int i;
677 
678 	for (i = 0; i < dev->n_resources; i++)
679 		macio_release_resource(dev, i);
680 }
681 
682 
683 #ifdef CONFIG_PCI
684 
685 static int macio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
686 {
687 	struct device_node* np;
688 	struct macio_chip* chip;
689 
690 	if (ent->vendor != PCI_VENDOR_ID_APPLE)
691 		return -ENODEV;
692 
693 	/* Note regarding refcounting: We assume pci_device_to_OF_node() is
694 	 * ported to new OF APIs and returns a node with refcount incremented.
695 	 */
696 	np = pci_device_to_OF_node(pdev);
697 	if (np == NULL)
698 		return -ENODEV;
699 
700 	/* The above assumption is wrong !!!
701 	 * fix that here for now until I fix the arch code
702 	 */
703 	of_node_get(np);
704 
705 	/* We also assume that pmac_feature will have done a get() on nodes
706 	 * stored in the macio chips array
707 	 */
708 	chip = macio_find(np, macio_unknown);
709        	of_node_put(np);
710 	if (chip == NULL)
711 		return -ENODEV;
712 
713 	/* XXX Need locking ??? */
714 	if (chip->lbus.pdev == NULL) {
715 		chip->lbus.pdev = pdev;
716 		chip->lbus.chip = chip;
717 		pci_set_drvdata(pdev, &chip->lbus);
718 		pci_set_master(pdev);
719 	}
720 
721 	printk(KERN_INFO "MacIO PCI driver attached to %s chipset\n",
722 		chip->name);
723 
724 	/*
725 	 * HACK ALERT: The WallStreet PowerBook and some OHare based machines
726 	 * have 2 macio ASICs. I must probe the "main" one first or IDE
727 	 * ordering will be incorrect. So I put on "hold" the second one since
728 	 * it seem to appear first on PCI
729 	 */
730 	if (chip->type == macio_gatwick || chip->type == macio_ohareII)
731 		if (macio_chips[0].lbus.pdev == NULL) {
732 			macio_on_hold = chip;
733 			return 0;
734 		}
735 
736 	macio_pci_add_devices(chip);
737 	if (macio_on_hold && macio_chips[0].lbus.pdev != NULL) {
738 		macio_pci_add_devices(macio_on_hold);
739 		macio_on_hold = NULL;
740 	}
741 
742 	return 0;
743 }
744 
745 static void macio_pci_remove(struct pci_dev* pdev)
746 {
747 	panic("removing of macio-asic not supported !\n");
748 }
749 
750 /*
751  * MacIO is matched against any Apple ID, it's probe() function
752  * will then decide wether it applies or not
753  */
754 static const struct pci_device_id pci_ids[] = { {
755 	.vendor		= PCI_VENDOR_ID_APPLE,
756 	.device		= PCI_ANY_ID,
757 	.subvendor	= PCI_ANY_ID,
758 	.subdevice	= PCI_ANY_ID,
759 
760 	}, { /* end: all zeroes */ }
761 };
762 MODULE_DEVICE_TABLE (pci, pci_ids);
763 
764 /* pci driver glue; this is a "new style" PCI driver module */
765 static struct pci_driver macio_pci_driver = {
766 	.name		= (char *) "macio",
767 	.id_table	= pci_ids,
768 
769 	.probe		= macio_pci_probe,
770 	.remove		= macio_pci_remove,
771 };
772 
773 #endif /* CONFIG_PCI */
774 
775 static int __init macio_module_init (void)
776 {
777 #ifdef CONFIG_PCI
778 	int rc;
779 
780 	rc = pci_register_driver(&macio_pci_driver);
781 	if (rc)
782 		return rc;
783 #endif /* CONFIG_PCI */
784 	return 0;
785 }
786 
787 module_init(macio_module_init);
788 
789 EXPORT_SYMBOL(macio_register_driver);
790 EXPORT_SYMBOL(macio_unregister_driver);
791 EXPORT_SYMBOL(macio_dev_get);
792 EXPORT_SYMBOL(macio_dev_put);
793 EXPORT_SYMBOL(macio_request_resource);
794 EXPORT_SYMBOL(macio_release_resource);
795 EXPORT_SYMBOL(macio_request_resources);
796 EXPORT_SYMBOL(macio_release_resources);
797 EXPORT_SYMBOL(macio_enable_devres);
798 
799