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.h>
24 #include <linux/of_address.h>
25 #include <linux/of_device.h>
26 #include <linux/of_irq.h>
27 
28 #include <asm/machdep.h>
29 #include <asm/macio.h>
30 #include <asm/pmac_feature.h>
31 
32 #undef DEBUG
33 
34 #define MAX_NODE_NAME_SIZE (20 - 12)
35 
36 static struct macio_chip      *macio_on_hold;
37 
38 static int macio_bus_match(struct device *dev, struct device_driver *drv)
39 {
40 	const struct of_device_id * matches = drv->of_match_table;
41 
42 	if (!matches)
43 		return 0;
44 
45 	return of_match_device(matches, dev) != NULL;
46 }
47 
48 struct macio_dev *macio_dev_get(struct macio_dev *dev)
49 {
50 	struct device *tmp;
51 
52 	if (!dev)
53 		return NULL;
54 	tmp = get_device(&dev->ofdev.dev);
55 	if (tmp)
56 		return to_macio_device(tmp);
57 	else
58 		return NULL;
59 }
60 
61 void macio_dev_put(struct macio_dev *dev)
62 {
63 	if (dev)
64 		put_device(&dev->ofdev.dev);
65 }
66 
67 
68 static int macio_device_probe(struct device *dev)
69 {
70 	int error = -ENODEV;
71 	struct macio_driver *drv;
72 	struct macio_dev *macio_dev;
73 	const struct of_device_id *match;
74 
75 	drv = to_macio_driver(dev->driver);
76 	macio_dev = to_macio_device(dev);
77 
78 	if (!drv->probe)
79 		return error;
80 
81 	macio_dev_get(macio_dev);
82 
83 	match = of_match_device(drv->driver.of_match_table, dev);
84 	if (match)
85 		error = drv->probe(macio_dev, match);
86 	if (error)
87 		macio_dev_put(macio_dev);
88 
89 	return error;
90 }
91 
92 static void macio_device_remove(struct device *dev)
93 {
94 	struct macio_dev * macio_dev = to_macio_device(dev);
95 	struct macio_driver * drv = to_macio_driver(dev->driver);
96 
97 	if (dev->driver && drv->remove)
98 		drv->remove(macio_dev);
99 	macio_dev_put(macio_dev);
100 }
101 
102 static void macio_device_shutdown(struct device *dev)
103 {
104 	struct macio_dev * macio_dev = to_macio_device(dev);
105 	struct macio_driver * drv = to_macio_driver(dev->driver);
106 
107 	if (dev->driver && drv->shutdown)
108 		drv->shutdown(macio_dev);
109 }
110 
111 static int macio_device_suspend(struct device *dev, pm_message_t state)
112 {
113 	struct macio_dev * macio_dev = to_macio_device(dev);
114 	struct macio_driver * drv = to_macio_driver(dev->driver);
115 
116 	if (dev->driver && drv->suspend)
117 		return drv->suspend(macio_dev, state);
118 	return 0;
119 }
120 
121 static int macio_device_resume(struct device * dev)
122 {
123 	struct macio_dev * macio_dev = to_macio_device(dev);
124 	struct macio_driver * drv = to_macio_driver(dev->driver);
125 
126 	if (dev->driver && drv->resume)
127 		return drv->resume(macio_dev);
128 	return 0;
129 }
130 
131 static int macio_device_modalias(const struct device *dev, struct kobj_uevent_env *env)
132 {
133 	return of_device_uevent_modalias(dev, env);
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	= macio_device_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 && of_node_name_eq(np, "gc"))
194 		res->end = res->start + 0x1ffff;
195 
196 	/* Airport has bogus resource 2 */
197 	if (index >= 2 && of_node_name_eq(np, "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 (of_node_name_eq(np, "escc"))
211 		return 1;
212 
213 	/* ESCC has bogus resources >= 3 */
214 	if (index >= 3 && (of_node_name_eq(np, "ch-a") ||
215 			   of_node_name_eq(np, "ch-b")))
216 		return 1;
217 
218 	/* Media bay has too many resources, keep only first one */
219 	if (index > 0 && of_node_name_eq(np, "media-bay"))
220 		return 1;
221 
222 	/* Some older IDE resources have bogus sizes */
223 	if (of_node_name_eq(np, "IDE") || of_node_name_eq(np, "ATA") ||
224 	    of_node_is_type(np, "ide") || of_node_is_type(np, "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 (of_node_name_eq(np, "ch-a")) {
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 (of_node_name_eq(np, "media-bay")) {
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 && of_node_name_eq(np, "floppy")) {
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 && of_node_name_eq(np, "ata4")) {
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 	char name[MAX_NODE_NAME_SIZE + 1];
364 	struct macio_dev *dev;
365 	const u32 *reg;
366 
367 	if (np == NULL)
368 		return NULL;
369 
370 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
371 	if (!dev)
372 		return NULL;
373 
374 	dev->bus = &chip->lbus;
375 	dev->media_bay = in_bay;
376 	dev->ofdev.dev.of_node = np;
377 	dev->ofdev.archdata.dma_mask = 0xffffffffUL;
378 	dev->ofdev.dev.dma_mask = &dev->ofdev.archdata.dma_mask;
379 	dev->ofdev.dev.coherent_dma_mask = dev->ofdev.archdata.dma_mask;
380 	dev->ofdev.dev.parent = parent;
381 	dev->ofdev.dev.bus = &macio_bus_type;
382 	dev->ofdev.dev.release = macio_release_dev;
383 	dev->ofdev.dev.dma_parms = &dev->dma_parms;
384 
385 	/* Standard DMA paremeters */
386 	dma_set_max_seg_size(&dev->ofdev.dev, 65536);
387 	dma_set_seg_boundary(&dev->ofdev.dev, 0xffffffff);
388 
389 #if defined(CONFIG_PCI) && defined(CONFIG_DMA_OPS)
390 	/* Set the DMA ops to the ones from the PCI device, this could be
391 	 * fishy if we didn't know that on PowerMac it's always direct ops
392 	 * or iommu ops that will work fine
393 	 *
394 	 * To get all the fields, copy all archdata
395 	 */
396 	dev->ofdev.dev.archdata = chip->lbus.pdev->dev.archdata;
397 	dev->ofdev.dev.dma_ops = chip->lbus.pdev->dev.dma_ops;
398 #endif /* CONFIG_PCI && CONFIG_DMA_OPS */
399 
400 #ifdef DEBUG
401 	printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n",
402 	       dev, &dev->ofdev, &dev->ofdev.dev, &dev->ofdev.dev.kobj);
403 #endif
404 
405 	/* MacIO itself has a different reg, we use it's PCI base */
406 	snprintf(name, sizeof(name), "%pOFn", np);
407 	if (np == chip->of_node) {
408 		dev_set_name(&dev->ofdev.dev, "%1d.%08x:%.*s",
409 			     chip->lbus.index,
410 #ifdef CONFIG_PCI
411 			(unsigned int)pci_resource_start(chip->lbus.pdev, 0),
412 #else
413 			0, /* NuBus may want to do something better here */
414 #endif
415 			MAX_NODE_NAME_SIZE, name);
416 	} else {
417 		reg = of_get_property(np, "reg", NULL);
418 		dev_set_name(&dev->ofdev.dev, "%1d.%08x:%.*s",
419 			     chip->lbus.index,
420 			     reg ? *reg : 0, MAX_NODE_NAME_SIZE, name);
421 	}
422 
423 	/* Setup interrupts & resources */
424 	macio_setup_interrupts(dev);
425 	macio_setup_resources(dev, parent_res);
426 	macio_add_missing_resources(dev);
427 
428 	/* Register with core */
429 	if (of_device_register(&dev->ofdev) != 0) {
430 		printk(KERN_DEBUG"macio: device registration error for %s!\n",
431 		       dev_name(&dev->ofdev.dev));
432 		put_device(&dev->ofdev.dev);
433 		return NULL;
434 	}
435 
436 	return dev;
437 }
438 
439 static int macio_skip_device(struct device_node *np)
440 {
441 	return of_node_name_prefix(np, "battery") ||
442 	       of_node_name_prefix(np, "escc-legacy");
443 }
444 
445 /**
446  * macio_pci_add_devices - Adds sub-devices of mac-io to the device tree
447  * @chip: pointer to the macio_chip holding the devices
448  *
449  * This function will do the job of extracting devices from the
450  * Open Firmware device tree, build macio_dev structures and add
451  * them to the Linux device tree.
452  *
453  * For now, childs of media-bay are added now as well. This will
454  * change rsn though.
455  */
456 static void macio_pci_add_devices(struct macio_chip *chip)
457 {
458 	struct device_node *np, *pnode;
459 	struct macio_dev *rdev, *mdev, *mbdev = NULL, *sdev = NULL;
460 	struct device *parent = NULL;
461 	struct resource *root_res = &iomem_resource;
462 
463 	/* Add a node for the macio bus itself */
464 #ifdef CONFIG_PCI
465 	if (chip->lbus.pdev) {
466 		parent = &chip->lbus.pdev->dev;
467 		root_res = &chip->lbus.pdev->resource[0];
468 	}
469 #endif
470 	pnode = of_node_get(chip->of_node);
471 	if (pnode == NULL)
472 		return;
473 
474 	/* Add macio itself to hierarchy */
475 	rdev = macio_add_one_device(chip, parent, pnode, NULL, root_res);
476 	if (rdev == NULL)
477 		return;
478 	root_res = &rdev->resource[0];
479 
480 	/* First scan 1st level */
481 	for_each_child_of_node(pnode, np) {
482 		if (macio_skip_device(np))
483 			continue;
484 		of_node_get(np);
485 		mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL,
486 					    root_res);
487 		if (mdev == NULL)
488 			of_node_put(np);
489 		else if (of_node_name_prefix(np, "media-bay"))
490 			mbdev = mdev;
491 		else if (of_node_name_prefix(np, "escc"))
492 			sdev = mdev;
493 	}
494 
495 	/* Add media bay devices if any */
496 	if (mbdev) {
497 		pnode = mbdev->ofdev.dev.of_node;
498 		for_each_child_of_node(pnode, np) {
499 			if (macio_skip_device(np))
500 				continue;
501 			of_node_get(np);
502 			if (macio_add_one_device(chip, &mbdev->ofdev.dev, np,
503 						 mbdev,  root_res) == NULL)
504 				of_node_put(np);
505 		}
506 	}
507 
508 	/* Add serial ports if any */
509 	if (sdev) {
510 		pnode = sdev->ofdev.dev.of_node;
511 		for_each_child_of_node(pnode, np) {
512 			if (macio_skip_device(np))
513 				continue;
514 			of_node_get(np);
515 			if (macio_add_one_device(chip, &sdev->ofdev.dev, np,
516 						 NULL, root_res) == NULL)
517 				of_node_put(np);
518 		}
519 	}
520 }
521 
522 
523 /**
524  * macio_register_driver - Registers a new MacIO device driver
525  * @drv: pointer to the driver definition structure
526  */
527 int macio_register_driver(struct macio_driver *drv)
528 {
529 	/* initialize common driver fields */
530 	drv->driver.bus = &macio_bus_type;
531 
532 	/* register with core */
533 	return driver_register(&drv->driver);
534 }
535 
536 /**
537  * macio_unregister_driver - Unregisters a new MacIO device driver
538  * @drv: pointer to the driver definition structure
539  */
540 void macio_unregister_driver(struct macio_driver *drv)
541 {
542 	driver_unregister(&drv->driver);
543 }
544 
545 /* Managed MacIO resources */
546 struct macio_devres {
547 	u32	res_mask;
548 };
549 
550 static void maciom_release(struct device *gendev, void *res)
551 {
552 	struct macio_dev *dev = to_macio_device(gendev);
553 	struct macio_devres *dr = res;
554 	int i, max;
555 
556 	max = min(dev->n_resources, 32);
557 	for (i = 0; i < max; i++) {
558 		if (dr->res_mask & (1 << i))
559 			macio_release_resource(dev, i);
560 	}
561 }
562 
563 int macio_enable_devres(struct macio_dev *dev)
564 {
565 	struct macio_devres *dr;
566 
567 	dr = devres_find(&dev->ofdev.dev, maciom_release, NULL, NULL);
568 	if (!dr) {
569 		dr = devres_alloc(maciom_release, sizeof(*dr), GFP_KERNEL);
570 		if (!dr)
571 			return -ENOMEM;
572 	}
573 	return devres_get(&dev->ofdev.dev, dr, NULL, NULL) != NULL;
574 }
575 
576 static struct macio_devres * find_macio_dr(struct macio_dev *dev)
577 {
578 	return devres_find(&dev->ofdev.dev, maciom_release, NULL, NULL);
579 }
580 
581 /**
582  *	macio_request_resource - Request an MMIO resource
583  * 	@dev: pointer to the device holding the resource
584  *	@resource_no: resource number to request
585  *	@name: resource name
586  *
587  *	Mark  memory region number @resource_no associated with MacIO
588  *	device @dev as being reserved by owner @name.  Do not access
589  *	any address inside the memory regions unless this call returns
590  *	successfully.
591  *
592  *	Returns 0 on success, or %EBUSY on error.  A warning
593  *	message is also printed on failure.
594  */
595 int macio_request_resource(struct macio_dev *dev, int resource_no,
596 			   const char *name)
597 {
598 	struct macio_devres *dr = find_macio_dr(dev);
599 
600 	if (macio_resource_len(dev, resource_no) == 0)
601 		return 0;
602 
603 	if (!request_mem_region(macio_resource_start(dev, resource_no),
604 				macio_resource_len(dev, resource_no),
605 				name))
606 		goto err_out;
607 
608 	if (dr && resource_no < 32)
609 		dr->res_mask |= 1 << resource_no;
610 
611 	return 0;
612 
613 err_out:
614 	printk (KERN_WARNING "MacIO: Unable to reserve resource #%d:%lx@%lx"
615 		" for device %s\n",
616 		resource_no,
617 		macio_resource_len(dev, resource_no),
618 		macio_resource_start(dev, resource_no),
619 		dev_name(&dev->ofdev.dev));
620 	return -EBUSY;
621 }
622 
623 /**
624  * macio_release_resource - Release an MMIO resource
625  * @dev: pointer to the device holding the resource
626  * @resource_no: resource number to release
627  */
628 void macio_release_resource(struct macio_dev *dev, int resource_no)
629 {
630 	struct macio_devres *dr = find_macio_dr(dev);
631 
632 	if (macio_resource_len(dev, resource_no) == 0)
633 		return;
634 	release_mem_region(macio_resource_start(dev, resource_no),
635 			   macio_resource_len(dev, resource_no));
636 	if (dr && resource_no < 32)
637 		dr->res_mask &= ~(1 << resource_no);
638 }
639 
640 /**
641  *	macio_request_resources - Reserve all memory resources
642  *	@dev: MacIO device whose resources are to be reserved
643  *	@name: Name to be associated with resource.
644  *
645  *	Mark all memory regions associated with MacIO device @dev as
646  *	being reserved by owner @name.  Do not access any address inside
647  *	the memory regions unless this call returns successfully.
648  *
649  *	Returns 0 on success, or %EBUSY on error.  A warning
650  *	message is also printed on failure.
651  */
652 int macio_request_resources(struct macio_dev *dev, const char *name)
653 {
654 	int i;
655 
656 	for (i = 0; i < dev->n_resources; i++)
657 		if (macio_request_resource(dev, i, name))
658 			goto err_out;
659 	return 0;
660 
661 err_out:
662 	while(--i >= 0)
663 		macio_release_resource(dev, i);
664 
665 	return -EBUSY;
666 }
667 
668 /**
669  *	macio_release_resources - Release reserved memory resources
670  *	@dev: MacIO device whose resources were previously reserved
671  */
672 
673 void macio_release_resources(struct macio_dev *dev)
674 {
675 	int i;
676 
677 	for (i = 0; i < dev->n_resources; i++)
678 		macio_release_resource(dev, i);
679 }
680 
681 
682 #ifdef CONFIG_PCI
683 
684 static int macio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
685 {
686 	struct device_node* np;
687 	struct macio_chip* chip;
688 
689 	if (ent->vendor != PCI_VENDOR_ID_APPLE)
690 		return -ENODEV;
691 
692 	/* Note regarding refcounting: We assume pci_device_to_OF_node() is
693 	 * ported to new OF APIs and returns a node with refcount incremented.
694 	 */
695 	np = pci_device_to_OF_node(pdev);
696 	if (np == NULL)
697 		return -ENODEV;
698 
699 	/* The above assumption is wrong !!!
700 	 * fix that here for now until I fix the arch code
701 	 */
702 	of_node_get(np);
703 
704 	/* We also assume that pmac_feature will have done a get() on nodes
705 	 * stored in the macio chips array
706 	 */
707 	chip = macio_find(np, macio_unknown);
708        	of_node_put(np);
709 	if (chip == NULL)
710 		return -ENODEV;
711 
712 	/* XXX Need locking ??? */
713 	if (chip->lbus.pdev == NULL) {
714 		chip->lbus.pdev = pdev;
715 		chip->lbus.chip = chip;
716 		pci_set_drvdata(pdev, &chip->lbus);
717 		pci_set_master(pdev);
718 	}
719 
720 	printk(KERN_INFO "MacIO PCI driver attached to %s chipset\n",
721 		chip->name);
722 
723 	/*
724 	 * HACK ALERT: The WallStreet PowerBook and some OHare based machines
725 	 * have 2 macio ASICs. I must probe the "main" one first or IDE
726 	 * ordering will be incorrect. So I put on "hold" the second one since
727 	 * it seem to appear first on PCI
728 	 */
729 	if (chip->type == macio_gatwick || chip->type == macio_ohareII)
730 		if (macio_chips[0].lbus.pdev == NULL) {
731 			macio_on_hold = chip;
732 			return 0;
733 		}
734 
735 	macio_pci_add_devices(chip);
736 	if (macio_on_hold && macio_chips[0].lbus.pdev != NULL) {
737 		macio_pci_add_devices(macio_on_hold);
738 		macio_on_hold = NULL;
739 	}
740 
741 	return 0;
742 }
743 
744 static void macio_pci_remove(struct pci_dev* pdev)
745 {
746 	panic("removing of macio-asic not supported !\n");
747 }
748 
749 /*
750  * MacIO is matched against any Apple ID, it's probe() function
751  * will then decide wether it applies or not
752  */
753 static const struct pci_device_id pci_ids[] = { {
754 	.vendor		= PCI_VENDOR_ID_APPLE,
755 	.device		= PCI_ANY_ID,
756 	.subvendor	= PCI_ANY_ID,
757 	.subdevice	= PCI_ANY_ID,
758 
759 	}, { /* end: all zeroes */ }
760 };
761 MODULE_DEVICE_TABLE (pci, pci_ids);
762 
763 /* pci driver glue; this is a "new style" PCI driver module */
764 static struct pci_driver macio_pci_driver = {
765 	.name		= "macio",
766 	.id_table	= pci_ids,
767 
768 	.probe		= macio_pci_probe,
769 	.remove		= macio_pci_remove,
770 };
771 
772 #endif /* CONFIG_PCI */
773 
774 static int __init macio_module_init (void)
775 {
776 #ifdef CONFIG_PCI
777 	int rc;
778 
779 	rc = pci_register_driver(&macio_pci_driver);
780 	if (rc)
781 		return rc;
782 #endif /* CONFIG_PCI */
783 	return 0;
784 }
785 
786 module_init(macio_module_init);
787 
788 EXPORT_SYMBOL(macio_register_driver);
789 EXPORT_SYMBOL(macio_unregister_driver);
790 EXPORT_SYMBOL(macio_dev_get);
791 EXPORT_SYMBOL(macio_dev_put);
792 EXPORT_SYMBOL(macio_request_resource);
793 EXPORT_SYMBOL(macio_release_resource);
794 EXPORT_SYMBOL(macio_request_resources);
795 EXPORT_SYMBOL(macio_release_resources);
796 EXPORT_SYMBOL(macio_enable_devres);
797 
798