1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Bus & driver management routines for devices within
4  * a MacIO ASIC. Interface to new driver model mostly
5  * stolen from the PCI version.
6  *
7  *  Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
8  *
9  * TODO:
10  *
11  *  - Don't probe below media bay by default, but instead provide
12  *    some hooks for media bay to dynamically add/remove it's own
13  *    sub-devices.
14  */
15 
16 #include <linux/string.h>
17 #include <linux/kernel.h>
18 #include <linux/pci.h>
19 #include <linux/pci_ids.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/of_address.h>
24 #include <linux/of_irq.h>
25 
26 #include <asm/machdep.h>
27 #include <asm/macio.h>
28 #include <asm/pmac_feature.h>
29 #include <asm/prom.h>
30 
31 #undef DEBUG
32 
33 #define MAX_NODE_NAME_SIZE (20 - 12)
34 
35 static struct macio_chip      *macio_on_hold;
36 
37 static int macio_bus_match(struct device *dev, struct device_driver *drv)
38 {
39 	const struct of_device_id * matches = drv->of_match_table;
40 
41 	if (!matches)
42 		return 0;
43 
44 	return of_match_device(matches, dev) != NULL;
45 }
46 
47 struct macio_dev *macio_dev_get(struct macio_dev *dev)
48 {
49 	struct device *tmp;
50 
51 	if (!dev)
52 		return NULL;
53 	tmp = get_device(&dev->ofdev.dev);
54 	if (tmp)
55 		return to_macio_device(tmp);
56 	else
57 		return NULL;
58 }
59 
60 void macio_dev_put(struct macio_dev *dev)
61 {
62 	if (dev)
63 		put_device(&dev->ofdev.dev);
64 }
65 
66 
67 static int macio_device_probe(struct device *dev)
68 {
69 	int error = -ENODEV;
70 	struct macio_driver *drv;
71 	struct macio_dev *macio_dev;
72 	const struct of_device_id *match;
73 
74 	drv = to_macio_driver(dev->driver);
75 	macio_dev = to_macio_device(dev);
76 
77 	if (!drv->probe)
78 		return error;
79 
80 	macio_dev_get(macio_dev);
81 
82 	match = of_match_device(drv->driver.of_match_table, dev);
83 	if (match)
84 		error = drv->probe(macio_dev, match);
85 	if (error)
86 		macio_dev_put(macio_dev);
87 
88 	return error;
89 }
90 
91 static int macio_device_remove(struct device *dev)
92 {
93 	struct macio_dev * macio_dev = to_macio_device(dev);
94 	struct macio_driver * drv = to_macio_driver(dev->driver);
95 
96 	if (dev->driver && drv->remove)
97 		drv->remove(macio_dev);
98 	macio_dev_put(macio_dev);
99 
100 	return 0;
101 }
102 
103 static void macio_device_shutdown(struct device *dev)
104 {
105 	struct macio_dev * macio_dev = to_macio_device(dev);
106 	struct macio_driver * drv = to_macio_driver(dev->driver);
107 
108 	if (dev->driver && drv->shutdown)
109 		drv->shutdown(macio_dev);
110 }
111 
112 static int macio_device_suspend(struct device *dev, pm_message_t state)
113 {
114 	struct macio_dev * macio_dev = to_macio_device(dev);
115 	struct macio_driver * drv = to_macio_driver(dev->driver);
116 
117 	if (dev->driver && drv->suspend)
118 		return drv->suspend(macio_dev, state);
119 	return 0;
120 }
121 
122 static int macio_device_resume(struct device * dev)
123 {
124 	struct macio_dev * macio_dev = to_macio_device(dev);
125 	struct macio_driver * drv = to_macio_driver(dev->driver);
126 
127 	if (dev->driver && drv->resume)
128 		return drv->resume(macio_dev);
129 	return 0;
130 }
131 
132 extern const struct attribute_group *macio_dev_groups[];
133 
134 struct bus_type macio_bus_type = {
135        .name	= "macio",
136        .match	= macio_bus_match,
137        .uevent = of_device_uevent_modalias,
138        .probe	= macio_device_probe,
139        .remove	= macio_device_remove,
140        .shutdown = macio_device_shutdown,
141        .suspend	= macio_device_suspend,
142        .resume	= macio_device_resume,
143        .dev_groups = macio_dev_groups,
144 };
145 
146 static int __init macio_bus_driver_init(void)
147 {
148 	return bus_register(&macio_bus_type);
149 }
150 
151 postcore_initcall(macio_bus_driver_init);
152 
153 
154 /**
155  * macio_release_dev - free a macio device structure when all users of it are
156  * finished.
157  * @dev: device that's been disconnected
158  *
159  * Will be called only by the device core when all users of this macio device
160  * are done. This currently means never as we don't hot remove any macio
161  * device yet, though that will happen with mediabay based devices in a later
162  * implementation.
163  */
164 static void macio_release_dev(struct device *dev)
165 {
166 	struct macio_dev *mdev;
167 
168         mdev = to_macio_device(dev);
169 	kfree(mdev);
170 }
171 
172 /**
173  * macio_resource_quirks - tweak or skip some resources for a device
174  * @np: pointer to the device node
175  * @res: resulting resource
176  * @index: index of resource in node
177  *
178  * If this routine returns non-null, then the resource is completely
179  * skipped.
180  */
181 static int macio_resource_quirks(struct device_node *np, struct resource *res,
182 				 int index)
183 {
184 	/* Only quirks for memory resources for now */
185 	if ((res->flags & IORESOURCE_MEM) == 0)
186 		return 0;
187 
188 	/* Grand Central has too large resource 0 on some machines */
189 	if (index == 0 && of_node_name_eq(np, "gc"))
190 		res->end = res->start + 0x1ffff;
191 
192 	/* Airport has bogus resource 2 */
193 	if (index >= 2 && of_node_name_eq(np, "radio"))
194 		return 1;
195 
196 #ifndef CONFIG_PPC64
197 	/* DBDMAs may have bogus sizes */
198 	if ((res->start & 0x0001f000) == 0x00008000)
199 		res->end = res->start + 0xff;
200 #endif /* CONFIG_PPC64 */
201 
202 	/* ESCC parent eats child resources. We could have added a
203 	 * level of hierarchy, but I don't really feel the need
204 	 * for it
205 	 */
206 	if (of_node_name_eq(np, "escc"))
207 		return 1;
208 
209 	/* ESCC has bogus resources >= 3 */
210 	if (index >= 3 && (of_node_name_eq(np, "ch-a") ||
211 			   of_node_name_eq(np, "ch-b")))
212 		return 1;
213 
214 	/* Media bay has too many resources, keep only first one */
215 	if (index > 0 && of_node_name_eq(np, "media-bay"))
216 		return 1;
217 
218 	/* Some older IDE resources have bogus sizes */
219 	if (of_node_name_eq(np, "IDE") || of_node_name_eq(np, "ATA") ||
220 	    of_node_is_type(np, "ide") || of_node_is_type(np, "ata")) {
221 		if (index == 0 && (res->end - res->start) > 0xfff)
222 			res->end = res->start + 0xfff;
223 		if (index == 1 && (res->end - res->start) > 0xff)
224 			res->end = res->start + 0xff;
225 	}
226 	return 0;
227 }
228 
229 static void macio_create_fixup_irq(struct macio_dev *dev, int index,
230 				   unsigned int line)
231 {
232 	unsigned int irq;
233 
234 	irq = irq_create_mapping(NULL, line);
235 	if (!irq) {
236 		dev->interrupt[index].start = irq;
237 		dev->interrupt[index].flags = IORESOURCE_IRQ;
238 		dev->interrupt[index].name = dev_name(&dev->ofdev.dev);
239 	}
240 	if (dev->n_interrupts <= index)
241 		dev->n_interrupts = index + 1;
242 }
243 
244 static void macio_add_missing_resources(struct macio_dev *dev)
245 {
246 	struct device_node *np = dev->ofdev.dev.of_node;
247 	unsigned int irq_base;
248 
249 	/* Gatwick has some missing interrupts on child nodes */
250 	if (dev->bus->chip->type != macio_gatwick)
251 		return;
252 
253 	/* irq_base is always 64 on gatwick. I have no cleaner way to get
254 	 * that value from here at this point
255 	 */
256 	irq_base = 64;
257 
258 	/* Fix SCC */
259 	if (of_node_name_eq(np, "ch-a")) {
260 		macio_create_fixup_irq(dev, 0, 15 + irq_base);
261 		macio_create_fixup_irq(dev, 1,  4 + irq_base);
262 		macio_create_fixup_irq(dev, 2,  5 + irq_base);
263 		printk(KERN_INFO "macio: fixed SCC irqs on gatwick\n");
264 	}
265 
266 	/* Fix media-bay */
267 	if (of_node_name_eq(np, "media-bay")) {
268 		macio_create_fixup_irq(dev, 0, 29 + irq_base);
269 		printk(KERN_INFO "macio: fixed media-bay irq on gatwick\n");
270 	}
271 
272 	/* Fix left media bay childs */
273 	if (dev->media_bay != NULL && of_node_name_eq(np, "floppy")) {
274 		macio_create_fixup_irq(dev, 0, 19 + irq_base);
275 		macio_create_fixup_irq(dev, 1,  1 + irq_base);
276 		printk(KERN_INFO "macio: fixed left floppy irqs\n");
277 	}
278 	if (dev->media_bay != NULL && of_node_name_eq(np, "ata4")) {
279 		macio_create_fixup_irq(dev, 0, 14 + irq_base);
280 		macio_create_fixup_irq(dev, 0,  3 + irq_base);
281 		printk(KERN_INFO "macio: fixed left ide irqs\n");
282 	}
283 }
284 
285 static void macio_setup_interrupts(struct macio_dev *dev)
286 {
287 	struct device_node *np = dev->ofdev.dev.of_node;
288 	unsigned int irq;
289 	int i = 0, j = 0;
290 
291 	for (;;) {
292 		struct resource *res;
293 
294 		if (j >= MACIO_DEV_COUNT_IRQS)
295 			break;
296 		res = &dev->interrupt[j];
297 		irq = irq_of_parse_and_map(np, i++);
298 		if (!irq)
299 			break;
300 		res->start = irq;
301 		res->flags = IORESOURCE_IRQ;
302 		res->name = dev_name(&dev->ofdev.dev);
303 		if (macio_resource_quirks(np, res, i - 1)) {
304 			memset(res, 0, sizeof(struct resource));
305 			continue;
306 		} else
307 			j++;
308 	}
309 	dev->n_interrupts = j;
310 }
311 
312 static void macio_setup_resources(struct macio_dev *dev,
313 				  struct resource *parent_res)
314 {
315 	struct device_node *np = dev->ofdev.dev.of_node;
316 	struct resource r;
317 	int index;
318 
319 	for (index = 0; of_address_to_resource(np, index, &r) == 0; index++) {
320 		struct resource *res;
321 		if (index >= MACIO_DEV_COUNT_RESOURCES)
322 			break;
323 		res = &dev->resource[index];
324 		*res = r;
325 		res->name = dev_name(&dev->ofdev.dev);
326 
327 		if (macio_resource_quirks(np, res, index)) {
328 			memset(res, 0, sizeof(struct resource));
329 			continue;
330 		}
331 		/* Currently, we consider failure as harmless, this may
332 		 * change in the future, once I've found all the device
333 		 * tree bugs in older machines & worked around them
334 		 */
335 		if (insert_resource(parent_res, res)) {
336 			printk(KERN_WARNING "Can't request resource "
337 			       "%d for MacIO device %s\n",
338 			       index, dev_name(&dev->ofdev.dev));
339 		}
340 	}
341 	dev->n_resources = index;
342 }
343 
344 /**
345  * macio_add_one_device - Add one device from OF node to the device tree
346  * @chip: pointer to the macio_chip holding the device
347  * @np: pointer to the device node in the OF tree
348  * @in_bay: set to 1 if device is part of a media-bay
349  *
350  * When media-bay is changed to hotswap drivers, this function will
351  * be exposed to the bay driver some way...
352  */
353 static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
354 					       struct device *parent,
355 					       struct device_node *np,
356 					       struct macio_dev *in_bay,
357 					       struct resource *parent_res)
358 {
359 	char name[MAX_NODE_NAME_SIZE + 1];
360 	struct macio_dev *dev;
361 	const u32 *reg;
362 
363 	if (np == NULL)
364 		return NULL;
365 
366 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
367 	if (!dev)
368 		return NULL;
369 
370 	dev->bus = &chip->lbus;
371 	dev->media_bay = in_bay;
372 	dev->ofdev.dev.of_node = np;
373 	dev->ofdev.archdata.dma_mask = 0xffffffffUL;
374 	dev->ofdev.dev.dma_mask = &dev->ofdev.archdata.dma_mask;
375 	dev->ofdev.dev.coherent_dma_mask = dev->ofdev.archdata.dma_mask;
376 	dev->ofdev.dev.parent = parent;
377 	dev->ofdev.dev.bus = &macio_bus_type;
378 	dev->ofdev.dev.release = macio_release_dev;
379 	dev->ofdev.dev.dma_parms = &dev->dma_parms;
380 
381 	/* Standard DMA paremeters */
382 	dma_set_max_seg_size(&dev->ofdev.dev, 65536);
383 	dma_set_seg_boundary(&dev->ofdev.dev, 0xffffffff);
384 
385 #ifdef CONFIG_PCI
386 	/* Set the DMA ops to the ones from the PCI device, this could be
387 	 * fishy if we didn't know that on PowerMac it's always direct ops
388 	 * or iommu ops that will work fine
389 	 *
390 	 * To get all the fields, copy all archdata
391 	 */
392 	dev->ofdev.dev.archdata = chip->lbus.pdev->dev.archdata;
393 	dev->ofdev.dev.dma_ops = chip->lbus.pdev->dev.dma_ops;
394 #endif /* CONFIG_PCI */
395 
396 #ifdef DEBUG
397 	printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n",
398 	       dev, &dev->ofdev, &dev->ofdev.dev, &dev->ofdev.dev.kobj);
399 #endif
400 
401 	/* MacIO itself has a different reg, we use it's PCI base */
402 	snprintf(name, sizeof(name), "%pOFn", np);
403 	if (np == chip->of_node) {
404 		dev_set_name(&dev->ofdev.dev, "%1d.%08x:%.*s",
405 			     chip->lbus.index,
406 #ifdef CONFIG_PCI
407 			(unsigned int)pci_resource_start(chip->lbus.pdev, 0),
408 #else
409 			0, /* NuBus may want to do something better here */
410 #endif
411 			MAX_NODE_NAME_SIZE, name);
412 	} else {
413 		reg = of_get_property(np, "reg", NULL);
414 		dev_set_name(&dev->ofdev.dev, "%1d.%08x:%.*s",
415 			     chip->lbus.index,
416 			     reg ? *reg : 0, MAX_NODE_NAME_SIZE, name);
417 	}
418 
419 	/* Setup interrupts & resources */
420 	macio_setup_interrupts(dev);
421 	macio_setup_resources(dev, parent_res);
422 	macio_add_missing_resources(dev);
423 
424 	/* Register with core */
425 	if (of_device_register(&dev->ofdev) != 0) {
426 		printk(KERN_DEBUG"macio: device registration error for %s!\n",
427 		       dev_name(&dev->ofdev.dev));
428 		kfree(dev);
429 		return NULL;
430 	}
431 
432 	return dev;
433 }
434 
435 static int macio_skip_device(struct device_node *np)
436 {
437 	return of_node_name_prefix(np, "battery") ||
438 	       of_node_name_prefix(np, "escc-legacy");
439 }
440 
441 /**
442  * macio_pci_add_devices - Adds sub-devices of mac-io to the device tree
443  * @chip: pointer to the macio_chip holding the devices
444  *
445  * This function will do the job of extracting devices from the
446  * Open Firmware device tree, build macio_dev structures and add
447  * them to the Linux device tree.
448  *
449  * For now, childs of media-bay are added now as well. This will
450  * change rsn though.
451  */
452 static void macio_pci_add_devices(struct macio_chip *chip)
453 {
454 	struct device_node *np, *pnode;
455 	struct macio_dev *rdev, *mdev, *mbdev = NULL, *sdev = NULL;
456 	struct device *parent = NULL;
457 	struct resource *root_res = &iomem_resource;
458 
459 	/* Add a node for the macio bus itself */
460 #ifdef CONFIG_PCI
461 	if (chip->lbus.pdev) {
462 		parent = &chip->lbus.pdev->dev;
463 		root_res = &chip->lbus.pdev->resource[0];
464 	}
465 #endif
466 	pnode = of_node_get(chip->of_node);
467 	if (pnode == NULL)
468 		return;
469 
470 	/* Add macio itself to hierarchy */
471 	rdev = macio_add_one_device(chip, parent, pnode, NULL, root_res);
472 	if (rdev == NULL)
473 		return;
474 	root_res = &rdev->resource[0];
475 
476 	/* First scan 1st level */
477 	for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
478 		if (macio_skip_device(np))
479 			continue;
480 		of_node_get(np);
481 		mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL,
482 					    root_res);
483 		if (mdev == NULL)
484 			of_node_put(np);
485 		else if (of_node_name_prefix(np, "media-bay"))
486 			mbdev = mdev;
487 		else if (of_node_name_prefix(np, "escc"))
488 			sdev = mdev;
489 	}
490 
491 	/* Add media bay devices if any */
492 	if (mbdev) {
493 		pnode = mbdev->ofdev.dev.of_node;
494 		for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
495 			if (macio_skip_device(np))
496 				continue;
497 			of_node_get(np);
498 			if (macio_add_one_device(chip, &mbdev->ofdev.dev, np,
499 						 mbdev,  root_res) == NULL)
500 				of_node_put(np);
501 		}
502 	}
503 
504 	/* Add serial ports if any */
505 	if (sdev) {
506 		pnode = sdev->ofdev.dev.of_node;
507 		for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
508 			if (macio_skip_device(np))
509 				continue;
510 			of_node_get(np);
511 			if (macio_add_one_device(chip, &sdev->ofdev.dev, np,
512 						 NULL, root_res) == NULL)
513 				of_node_put(np);
514 		}
515 	}
516 }
517 
518 
519 /**
520  * macio_register_driver - Registers a new MacIO device driver
521  * @drv: pointer to the driver definition structure
522  */
523 int macio_register_driver(struct macio_driver *drv)
524 {
525 	/* initialize common driver fields */
526 	drv->driver.bus = &macio_bus_type;
527 
528 	/* register with core */
529 	return driver_register(&drv->driver);
530 }
531 
532 /**
533  * macio_unregister_driver - Unregisters a new MacIO device driver
534  * @drv: pointer to the driver definition structure
535  */
536 void macio_unregister_driver(struct macio_driver *drv)
537 {
538 	driver_unregister(&drv->driver);
539 }
540 
541 /* Managed MacIO resources */
542 struct macio_devres {
543 	u32	res_mask;
544 };
545 
546 static void maciom_release(struct device *gendev, void *res)
547 {
548 	struct macio_dev *dev = to_macio_device(gendev);
549 	struct macio_devres *dr = res;
550 	int i, max;
551 
552 	max = min(dev->n_resources, 32);
553 	for (i = 0; i < max; i++) {
554 		if (dr->res_mask & (1 << i))
555 			macio_release_resource(dev, i);
556 	}
557 }
558 
559 int macio_enable_devres(struct macio_dev *dev)
560 {
561 	struct macio_devres *dr;
562 
563 	dr = devres_find(&dev->ofdev.dev, maciom_release, NULL, NULL);
564 	if (!dr) {
565 		dr = devres_alloc(maciom_release, sizeof(*dr), GFP_KERNEL);
566 		if (!dr)
567 			return -ENOMEM;
568 	}
569 	return devres_get(&dev->ofdev.dev, dr, NULL, NULL) != NULL;
570 }
571 
572 static struct macio_devres * find_macio_dr(struct macio_dev *dev)
573 {
574 	return devres_find(&dev->ofdev.dev, maciom_release, NULL, NULL);
575 }
576 
577 /**
578  *	macio_request_resource - Request an MMIO resource
579  * 	@dev: pointer to the device holding the resource
580  *	@resource_no: resource number to request
581  *	@name: resource name
582  *
583  *	Mark  memory region number @resource_no associated with MacIO
584  *	device @dev as being reserved by owner @name.  Do not access
585  *	any address inside the memory regions unless this call returns
586  *	successfully.
587  *
588  *	Returns 0 on success, or %EBUSY on error.  A warning
589  *	message is also printed on failure.
590  */
591 int macio_request_resource(struct macio_dev *dev, int resource_no,
592 			   const char *name)
593 {
594 	struct macio_devres *dr = find_macio_dr(dev);
595 
596 	if (macio_resource_len(dev, resource_no) == 0)
597 		return 0;
598 
599 	if (!request_mem_region(macio_resource_start(dev, resource_no),
600 				macio_resource_len(dev, resource_no),
601 				name))
602 		goto err_out;
603 
604 	if (dr && resource_no < 32)
605 		dr->res_mask |= 1 << resource_no;
606 
607 	return 0;
608 
609 err_out:
610 	printk (KERN_WARNING "MacIO: Unable to reserve resource #%d:%lx@%lx"
611 		" for device %s\n",
612 		resource_no,
613 		macio_resource_len(dev, resource_no),
614 		macio_resource_start(dev, resource_no),
615 		dev_name(&dev->ofdev.dev));
616 	return -EBUSY;
617 }
618 
619 /**
620  * macio_release_resource - Release an MMIO resource
621  * @dev: pointer to the device holding the resource
622  * @resource_no: resource number to release
623  */
624 void macio_release_resource(struct macio_dev *dev, int resource_no)
625 {
626 	struct macio_devres *dr = find_macio_dr(dev);
627 
628 	if (macio_resource_len(dev, resource_no) == 0)
629 		return;
630 	release_mem_region(macio_resource_start(dev, resource_no),
631 			   macio_resource_len(dev, resource_no));
632 	if (dr && resource_no < 32)
633 		dr->res_mask &= ~(1 << resource_no);
634 }
635 
636 /**
637  *	macio_request_resources - Reserve all memory resources
638  *	@dev: MacIO device whose resources are to be reserved
639  *	@name: Name to be associated with resource.
640  *
641  *	Mark all memory regions associated with MacIO device @dev as
642  *	being reserved by owner @name.  Do not access any address inside
643  *	the memory regions unless this call returns successfully.
644  *
645  *	Returns 0 on success, or %EBUSY on error.  A warning
646  *	message is also printed on failure.
647  */
648 int macio_request_resources(struct macio_dev *dev, const char *name)
649 {
650 	int i;
651 
652 	for (i = 0; i < dev->n_resources; i++)
653 		if (macio_request_resource(dev, i, name))
654 			goto err_out;
655 	return 0;
656 
657 err_out:
658 	while(--i >= 0)
659 		macio_release_resource(dev, i);
660 
661 	return -EBUSY;
662 }
663 
664 /**
665  *	macio_release_resources - Release reserved memory resources
666  *	@dev: MacIO device whose resources were previously reserved
667  */
668 
669 void macio_release_resources(struct macio_dev *dev)
670 {
671 	int i;
672 
673 	for (i = 0; i < dev->n_resources; i++)
674 		macio_release_resource(dev, i);
675 }
676 
677 
678 #ifdef CONFIG_PCI
679 
680 static int macio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
681 {
682 	struct device_node* np;
683 	struct macio_chip* chip;
684 
685 	if (ent->vendor != PCI_VENDOR_ID_APPLE)
686 		return -ENODEV;
687 
688 	/* Note regarding refcounting: We assume pci_device_to_OF_node() is
689 	 * ported to new OF APIs and returns a node with refcount incremented.
690 	 */
691 	np = pci_device_to_OF_node(pdev);
692 	if (np == NULL)
693 		return -ENODEV;
694 
695 	/* The above assumption is wrong !!!
696 	 * fix that here for now until I fix the arch code
697 	 */
698 	of_node_get(np);
699 
700 	/* We also assume that pmac_feature will have done a get() on nodes
701 	 * stored in the macio chips array
702 	 */
703 	chip = macio_find(np, macio_unknown);
704        	of_node_put(np);
705 	if (chip == NULL)
706 		return -ENODEV;
707 
708 	/* XXX Need locking ??? */
709 	if (chip->lbus.pdev == NULL) {
710 		chip->lbus.pdev = pdev;
711 		chip->lbus.chip = chip;
712 		pci_set_drvdata(pdev, &chip->lbus);
713 		pci_set_master(pdev);
714 	}
715 
716 	printk(KERN_INFO "MacIO PCI driver attached to %s chipset\n",
717 		chip->name);
718 
719 	/*
720 	 * HACK ALERT: The WallStreet PowerBook and some OHare based machines
721 	 * have 2 macio ASICs. I must probe the "main" one first or IDE
722 	 * ordering will be incorrect. So I put on "hold" the second one since
723 	 * it seem to appear first on PCI
724 	 */
725 	if (chip->type == macio_gatwick || chip->type == macio_ohareII)
726 		if (macio_chips[0].lbus.pdev == NULL) {
727 			macio_on_hold = chip;
728 			return 0;
729 		}
730 
731 	macio_pci_add_devices(chip);
732 	if (macio_on_hold && macio_chips[0].lbus.pdev != NULL) {
733 		macio_pci_add_devices(macio_on_hold);
734 		macio_on_hold = NULL;
735 	}
736 
737 	return 0;
738 }
739 
740 static void macio_pci_remove(struct pci_dev* pdev)
741 {
742 	panic("removing of macio-asic not supported !\n");
743 }
744 
745 /*
746  * MacIO is matched against any Apple ID, it's probe() function
747  * will then decide wether it applies or not
748  */
749 static const struct pci_device_id pci_ids[] = { {
750 	.vendor		= PCI_VENDOR_ID_APPLE,
751 	.device		= PCI_ANY_ID,
752 	.subvendor	= PCI_ANY_ID,
753 	.subdevice	= PCI_ANY_ID,
754 
755 	}, { /* end: all zeroes */ }
756 };
757 MODULE_DEVICE_TABLE (pci, pci_ids);
758 
759 /* pci driver glue; this is a "new style" PCI driver module */
760 static struct pci_driver macio_pci_driver = {
761 	.name		= (char *) "macio",
762 	.id_table	= pci_ids,
763 
764 	.probe		= macio_pci_probe,
765 	.remove		= macio_pci_remove,
766 };
767 
768 #endif /* CONFIG_PCI */
769 
770 static int __init macio_module_init (void)
771 {
772 #ifdef CONFIG_PCI
773 	int rc;
774 
775 	rc = pci_register_driver(&macio_pci_driver);
776 	if (rc)
777 		return rc;
778 #endif /* CONFIG_PCI */
779 	return 0;
780 }
781 
782 module_init(macio_module_init);
783 
784 EXPORT_SYMBOL(macio_register_driver);
785 EXPORT_SYMBOL(macio_unregister_driver);
786 EXPORT_SYMBOL(macio_dev_get);
787 EXPORT_SYMBOL(macio_dev_put);
788 EXPORT_SYMBOL(macio_request_resource);
789 EXPORT_SYMBOL(macio_release_resource);
790 EXPORT_SYMBOL(macio_request_resources);
791 EXPORT_SYMBOL(macio_release_resources);
792 EXPORT_SYMBOL(macio_enable_devres);
793 
794