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