[ARM] Support register switch in nommu mode
[linux-2.6/verdex.git] / drivers / macintosh / macio_asic.c
blob2a545ceb523b05cfb57fdf20b8c79e1ca1f5ca2e
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)
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.
13 * TODO:
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.
20 #include <linux/config.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/pci.h>
24 #include <linux/pci_ids.h>
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
29 #include <asm/machdep.h>
30 #include <asm/macio.h>
31 #include <asm/pmac_feature.h>
32 #include <asm/prom.h>
33 #include <asm/pci-bridge.h>
35 #undef DEBUG
37 #define MAX_NODE_NAME_SIZE (BUS_ID_SIZE - 12)
39 static struct macio_chip *macio_on_hold;
41 static int macio_bus_match(struct device *dev, struct device_driver *drv)
43 struct macio_dev * macio_dev = to_macio_device(dev);
44 struct macio_driver * macio_drv = to_macio_driver(drv);
45 const struct of_device_id * matches = macio_drv->match_table;
47 if (!matches)
48 return 0;
50 return of_match_device(matches, &macio_dev->ofdev) != NULL;
53 struct macio_dev *macio_dev_get(struct macio_dev *dev)
55 struct device *tmp;
57 if (!dev)
58 return NULL;
59 tmp = get_device(&dev->ofdev.dev);
60 if (tmp)
61 return to_macio_device(tmp);
62 else
63 return NULL;
66 void macio_dev_put(struct macio_dev *dev)
68 if (dev)
69 put_device(&dev->ofdev.dev);
73 static int macio_device_probe(struct device *dev)
75 int error = -ENODEV;
76 struct macio_driver *drv;
77 struct macio_dev *macio_dev;
78 const struct of_device_id *match;
80 drv = to_macio_driver(dev->driver);
81 macio_dev = to_macio_device(dev);
83 if (!drv->probe)
84 return error;
86 macio_dev_get(macio_dev);
88 match = of_match_device(drv->match_table, &macio_dev->ofdev);
89 if (match)
90 error = drv->probe(macio_dev, match);
91 if (error)
92 macio_dev_put(macio_dev);
94 return error;
97 static int macio_device_remove(struct device *dev)
99 struct macio_dev * macio_dev = to_macio_device(dev);
100 struct macio_driver * drv = to_macio_driver(dev->driver);
102 if (dev->driver && drv->remove)
103 drv->remove(macio_dev);
104 macio_dev_put(macio_dev);
106 return 0;
109 static void macio_device_shutdown(struct device *dev)
111 struct macio_dev * macio_dev = to_macio_device(dev);
112 struct macio_driver * drv = to_macio_driver(dev->driver);
114 if (dev->driver && drv->shutdown)
115 drv->shutdown(macio_dev);
118 static int macio_device_suspend(struct device *dev, pm_message_t state)
120 struct macio_dev * macio_dev = to_macio_device(dev);
121 struct macio_driver * drv = to_macio_driver(dev->driver);
123 if (dev->driver && drv->suspend)
124 return drv->suspend(macio_dev, state);
125 return 0;
128 static int macio_device_resume(struct device * dev)
130 struct macio_dev * macio_dev = to_macio_device(dev);
131 struct macio_driver * drv = to_macio_driver(dev->driver);
133 if (dev->driver && drv->resume)
134 return drv->resume(macio_dev);
135 return 0;
138 static int macio_uevent(struct device *dev, char **envp, int num_envp,
139 char *buffer, int buffer_size)
141 struct macio_dev * macio_dev;
142 struct of_device * of;
143 char *scratch, *compat;
144 int i = 0;
145 int length = 0;
146 int cplen, seen = 0;
148 if (!dev)
149 return -ENODEV;
151 macio_dev = to_macio_device(dev);
152 if (!macio_dev)
153 return -ENODEV;
155 of = &macio_dev->ofdev;
156 scratch = buffer;
158 /* stuff we want to pass to /sbin/hotplug */
159 envp[i++] = scratch;
160 length += scnprintf (scratch, buffer_size - length, "OF_NAME=%s",
161 of->node->name);
162 if ((buffer_size - length <= 0) || (i >= num_envp))
163 return -ENOMEM;
164 ++length;
165 scratch += length;
167 envp[i++] = scratch;
168 length += scnprintf (scratch, buffer_size - length, "OF_TYPE=%s",
169 of->node->type);
170 if ((buffer_size - length <= 0) || (i >= num_envp))
171 return -ENOMEM;
172 ++length;
173 scratch += length;
175 /* Since the compatible field can contain pretty much anything
176 * it's not really legal to split it out with commas. We split it
177 * up using a number of environment variables instead. */
179 compat = (char *) get_property(of->node, "compatible", &cplen);
180 while (compat && cplen > 0) {
181 int l;
182 envp[i++] = scratch;
183 length += scnprintf (scratch, buffer_size - length,
184 "OF_COMPATIBLE_%d=%s", seen, compat);
185 if ((buffer_size - length <= 0) || (i >= num_envp))
186 return -ENOMEM;
187 length++;
188 scratch += length;
189 l = strlen (compat) + 1;
190 compat += l;
191 cplen -= l;
192 seen++;
195 envp[i++] = scratch;
196 length += scnprintf (scratch, buffer_size - length,
197 "OF_COMPATIBLE_N=%d", seen);
198 if ((buffer_size - length <= 0) || (i >= num_envp))
199 return -ENOMEM;
200 ++length;
201 scratch += length;
203 envp[i] = NULL;
205 return 0;
208 extern struct device_attribute macio_dev_attrs[];
210 struct bus_type macio_bus_type = {
211 .name = "macio",
212 .match = macio_bus_match,
213 .uevent = macio_uevent,
214 .suspend = macio_device_suspend,
215 .resume = macio_device_resume,
216 .dev_attrs = macio_dev_attrs,
219 static int __init macio_bus_driver_init(void)
221 return bus_register(&macio_bus_type);
224 postcore_initcall(macio_bus_driver_init);
228 * macio_release_dev - free a macio device structure when all users of it are
229 * finished.
230 * @dev: device that's been disconnected
232 * Will be called only by the device core when all users of this macio device
233 * are done. This currently means never as we don't hot remove any macio
234 * device yet, though that will happen with mediabay based devices in a later
235 * implementation.
237 static void macio_release_dev(struct device *dev)
239 struct macio_dev *mdev;
241 mdev = to_macio_device(dev);
242 kfree(mdev);
246 * macio_resource_quirks - tweak or skip some resources for a device
247 * @np: pointer to the device node
248 * @res: resulting resource
249 * @index: index of resource in node
251 * If this routine returns non-null, then the resource is completely
252 * skipped.
254 static int macio_resource_quirks(struct device_node *np, struct resource *res,
255 int index)
257 if (res->flags & IORESOURCE_MEM) {
258 /* Grand Central has too large resource 0 on some machines */
259 if (index == 0 && !strcmp(np->name, "gc"))
260 res->end = res->start + 0x1ffff;
262 /* Airport has bogus resource 2 */
263 if (index >= 2 && !strcmp(np->name, "radio"))
264 return 1;
266 #ifndef CONFIG_PPC64
267 /* DBDMAs may have bogus sizes */
268 if ((res->start & 0x0001f000) == 0x00008000)
269 res->end = res->start + 0xff;
270 #endif /* CONFIG_PPC64 */
272 /* ESCC parent eats child resources. We could have added a
273 * level of hierarchy, but I don't really feel the need
274 * for it
276 if (!strcmp(np->name, "escc"))
277 return 1;
279 /* ESCC has bogus resources >= 3 */
280 if (index >= 3 && !(strcmp(np->name, "ch-a") &&
281 strcmp(np->name, "ch-b")))
282 return 1;
284 /* Media bay has too many resources, keep only first one */
285 if (index > 0 && !strcmp(np->name, "media-bay"))
286 return 1;
288 /* Some older IDE resources have bogus sizes */
289 if (!(strcmp(np->name, "IDE") && strcmp(np->name, "ATA") &&
290 strcmp(np->type, "ide") && strcmp(np->type, "ata"))) {
291 if (index == 0 && (res->end - res->start) > 0xfff)
292 res->end = res->start + 0xfff;
293 if (index == 1 && (res->end - res->start) > 0xff)
294 res->end = res->start + 0xff;
297 return 0;
301 static void macio_setup_interrupts(struct macio_dev *dev)
303 struct device_node *np = dev->ofdev.node;
304 int i,j;
306 /* For now, we use pre-parsed entries in the device-tree for
307 * interrupt routing and addresses, but we should change that
308 * to dynamically parsed entries and so get rid of most of the
309 * clutter in struct device_node
311 for (i = j = 0; i < np->n_intrs; i++) {
312 struct resource *res = &dev->interrupt[j];
314 if (j >= MACIO_DEV_COUNT_IRQS)
315 break;
316 res->start = np->intrs[i].line;
317 res->flags = IORESOURCE_IO;
318 if (np->intrs[j].sense)
319 res->flags |= IORESOURCE_IRQ_LOWLEVEL;
320 else
321 res->flags |= IORESOURCE_IRQ_HIGHEDGE;
322 res->name = dev->ofdev.dev.bus_id;
323 if (macio_resource_quirks(np, res, i))
324 memset(res, 0, sizeof(struct resource));
325 else
326 j++;
328 dev->n_interrupts = j;
331 static void macio_setup_resources(struct macio_dev *dev,
332 struct resource *parent_res)
334 struct device_node *np = dev->ofdev.node;
335 struct resource r;
336 int index;
338 for (index = 0; of_address_to_resource(np, index, &r) == 0; index++) {
339 struct resource *res = &dev->resource[index];
340 if (index >= MACIO_DEV_COUNT_RESOURCES)
341 break;
342 *res = r;
343 res->name = dev->ofdev.dev.bus_id;
345 if (macio_resource_quirks(np, res, index)) {
346 memset(res, 0, sizeof(struct resource));
347 continue;
349 /* Currently, we consider failure as harmless, this may
350 * change in the future, once I've found all the device
351 * tree bugs in older machines & worked around them
353 if (insert_resource(parent_res, res)) {
354 printk(KERN_WARNING "Can't request resource "
355 "%d for MacIO device %s\n",
356 index, dev->ofdev.dev.bus_id);
359 dev->n_resources = index;
363 * macio_add_one_device - Add one device from OF node to the device tree
364 * @chip: pointer to the macio_chip holding the device
365 * @np: pointer to the device node in the OF tree
366 * @in_bay: set to 1 if device is part of a media-bay
368 * When media-bay is changed to hotswap drivers, this function will
369 * be exposed to the bay driver some way...
371 static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
372 struct device *parent,
373 struct device_node *np,
374 struct macio_dev *in_bay,
375 struct resource *parent_res)
377 struct macio_dev *dev;
378 u32 *reg;
380 if (np == NULL)
381 return NULL;
383 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
384 if (!dev)
385 return NULL;
386 memset(dev, 0, sizeof(*dev));
388 dev->bus = &chip->lbus;
389 dev->media_bay = in_bay;
390 dev->ofdev.node = np;
391 dev->ofdev.dma_mask = 0xffffffffUL;
392 dev->ofdev.dev.dma_mask = &dev->ofdev.dma_mask;
393 dev->ofdev.dev.parent = parent;
394 dev->ofdev.dev.bus = &macio_bus_type;
395 dev->ofdev.dev.release = macio_release_dev;
397 #ifdef DEBUG
398 printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n",
399 dev, &dev->ofdev, &dev->ofdev.dev, &dev->ofdev.dev.kobj);
400 #endif
402 /* MacIO itself has a different reg, we use it's PCI base */
403 if (np == chip->of_node) {
404 sprintf(dev->ofdev.dev.bus_id, "%1d.%08lx:%.*s",
405 chip->lbus.index,
406 #ifdef CONFIG_PCI
407 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, np->name);
412 } else {
413 reg = (u32 *)get_property(np, "reg", NULL);
414 sprintf(dev->ofdev.dev.bus_id, "%1d.%08x:%.*s",
415 chip->lbus.index,
416 reg ? *reg : 0, MAX_NODE_NAME_SIZE, np->name);
419 /* Setup interrupts & resources */
420 macio_setup_interrupts(dev);
421 macio_setup_resources(dev, parent_res);
423 /* Register with core */
424 if (of_device_register(&dev->ofdev) != 0) {
425 printk(KERN_DEBUG"macio: device registration error for %s!\n",
426 dev->ofdev.dev.bus_id);
427 kfree(dev);
428 return NULL;
431 return dev;
434 static int macio_skip_device(struct device_node *np)
436 if (strncmp(np->name, "battery", 7) == 0)
437 return 1;
438 if (strncmp(np->name, "escc-legacy", 11) == 0)
439 return 1;
440 return 0;
444 * macio_pci_add_devices - Adds sub-devices of mac-io to the device tree
445 * @chip: pointer to the macio_chip holding the devices
447 * This function will do the job of extracting devices from the
448 * Open Firmware device tree, build macio_dev structures and add
449 * them to the Linux device tree.
451 * For now, childs of media-bay are added now as well. This will
452 * change rsn though.
454 static void macio_pci_add_devices(struct macio_chip *chip)
456 struct device_node *np, *pnode;
457 struct macio_dev *rdev, *mdev, *mbdev = NULL, *sdev = NULL;
458 struct device *parent = NULL;
459 struct resource *root_res = &iomem_resource;
461 /* Add a node for the macio bus itself */
462 #ifdef CONFIG_PCI
463 if (chip->lbus.pdev) {
464 parent = &chip->lbus.pdev->dev;
465 root_res = &chip->lbus.pdev->resource[0];
467 #endif
468 pnode = of_node_get(chip->of_node);
469 if (pnode == NULL)
470 return;
472 /* Add macio itself to hierarchy */
473 rdev = macio_add_one_device(chip, parent, pnode, NULL, root_res);
474 if (rdev == NULL)
475 return;
476 root_res = &rdev->resource[0];
478 /* First scan 1st level */
479 for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
480 if (macio_skip_device(np))
481 continue;
482 of_node_get(np);
483 mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL,
484 root_res);
485 if (mdev == NULL)
486 of_node_put(np);
487 else if (strncmp(np->name, "media-bay", 9) == 0)
488 mbdev = mdev;
489 else if (strncmp(np->name, "escc", 4) == 0)
490 sdev = mdev;
493 /* Add media bay devices if any */
494 if (mbdev)
495 for (np = NULL; (np = of_get_next_child(mbdev->ofdev.node, np))
496 != NULL;) {
497 if (macio_skip_device(np))
498 continue;
499 of_node_get(np);
500 if (macio_add_one_device(chip, &mbdev->ofdev.dev, np,
501 mbdev, root_res) == NULL)
502 of_node_put(np);
505 /* Add serial ports if any */
506 if (sdev) {
507 for (np = NULL; (np = of_get_next_child(sdev->ofdev.node, np))
508 != NULL;) {
509 if (macio_skip_device(np))
510 continue;
511 of_node_get(np);
512 if (macio_add_one_device(chip, &sdev->ofdev.dev, np,
513 NULL, root_res) == NULL)
514 of_node_put(np);
521 * macio_register_driver - Registers a new MacIO device driver
522 * @drv: pointer to the driver definition structure
524 int macio_register_driver(struct macio_driver *drv)
526 int count = 0;
528 /* initialize common driver fields */
529 drv->driver.name = drv->name;
530 drv->driver.bus = &macio_bus_type;
531 drv->driver.probe = macio_device_probe;
532 drv->driver.remove = macio_device_remove;
533 drv->driver.shutdown = macio_device_shutdown;
535 /* register with core */
536 count = driver_register(&drv->driver);
537 return count ? count : 1;
541 * macio_unregister_driver - Unregisters a new MacIO device driver
542 * @drv: pointer to the driver definition structure
544 void macio_unregister_driver(struct macio_driver *drv)
546 driver_unregister(&drv->driver);
550 * macio_request_resource - Request an MMIO resource
551 * @dev: pointer to the device holding the resource
552 * @resource_no: resource number to request
553 * @name: resource name
555 * Mark memory region number @resource_no associated with MacIO
556 * device @dev as being reserved by owner @name. Do not access
557 * any address inside the memory regions unless this call returns
558 * successfully.
560 * Returns 0 on success, or %EBUSY on error. A warning
561 * message is also printed on failure.
563 int macio_request_resource(struct macio_dev *dev, int resource_no,
564 const char *name)
566 if (macio_resource_len(dev, resource_no) == 0)
567 return 0;
569 if (!request_mem_region(macio_resource_start(dev, resource_no),
570 macio_resource_len(dev, resource_no),
571 name))
572 goto err_out;
574 return 0;
576 err_out:
577 printk (KERN_WARNING "MacIO: Unable to reserve resource #%d:%lx@%lx"
578 " for device %s\n",
579 resource_no,
580 macio_resource_len(dev, resource_no),
581 macio_resource_start(dev, resource_no),
582 dev->ofdev.dev.bus_id);
583 return -EBUSY;
587 * macio_release_resource - Release an MMIO resource
588 * @dev: pointer to the device holding the resource
589 * @resource_no: resource number to release
591 void macio_release_resource(struct macio_dev *dev, int resource_no)
593 if (macio_resource_len(dev, resource_no) == 0)
594 return;
595 release_mem_region(macio_resource_start(dev, resource_no),
596 macio_resource_len(dev, resource_no));
600 * macio_request_resources - Reserve all memory resources
601 * @dev: MacIO device whose resources are to be reserved
602 * @name: Name to be associated with resource.
604 * Mark all memory regions associated with MacIO device @dev as
605 * being reserved by owner @name. Do not access any address inside
606 * the memory regions unless this call returns successfully.
608 * Returns 0 on success, or %EBUSY on error. A warning
609 * message is also printed on failure.
611 int macio_request_resources(struct macio_dev *dev, const char *name)
613 int i;
615 for (i = 0; i < dev->n_resources; i++)
616 if (macio_request_resource(dev, i, name))
617 goto err_out;
618 return 0;
620 err_out:
621 while(--i >= 0)
622 macio_release_resource(dev, i);
624 return -EBUSY;
628 * macio_release_resources - Release reserved memory resources
629 * @dev: MacIO device whose resources were previously reserved
632 void macio_release_resources(struct macio_dev *dev)
634 int i;
636 for (i = 0; i < dev->n_resources; i++)
637 macio_release_resource(dev, i);
641 #ifdef CONFIG_PCI
643 static int __devinit macio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
645 struct device_node* np;
646 struct macio_chip* chip;
648 if (ent->vendor != PCI_VENDOR_ID_APPLE)
649 return -ENODEV;
651 /* Note regarding refcounting: We assume pci_device_to_OF_node() is
652 * ported to new OF APIs and returns a node with refcount incremented.
654 np = pci_device_to_OF_node(pdev);
655 if (np == NULL)
656 return -ENODEV;
658 /* The above assumption is wrong !!!
659 * fix that here for now until I fix the arch code
661 of_node_get(np);
663 /* We also assume that pmac_feature will have done a get() on nodes
664 * stored in the macio chips array
666 chip = macio_find(np, macio_unknown);
667 of_node_put(np);
668 if (chip == NULL)
669 return -ENODEV;
671 /* XXX Need locking ??? */
672 if (chip->lbus.pdev == NULL) {
673 chip->lbus.pdev = pdev;
674 chip->lbus.chip = chip;
675 pci_set_drvdata(pdev, &chip->lbus);
676 pci_set_master(pdev);
679 printk(KERN_INFO "MacIO PCI driver attached to %s chipset\n",
680 chip->name);
683 * HACK ALERT: The WallStreet PowerBook and some OHare based machines
684 * have 2 macio ASICs. I must probe the "main" one first or IDE
685 * ordering will be incorrect. So I put on "hold" the second one since
686 * it seem to appear first on PCI
688 if (chip->type == macio_gatwick || chip->type == macio_ohareII)
689 if (macio_chips[0].lbus.pdev == NULL) {
690 macio_on_hold = chip;
691 return 0;
694 macio_pci_add_devices(chip);
695 if (macio_on_hold && macio_chips[0].lbus.pdev != NULL) {
696 macio_pci_add_devices(macio_on_hold);
697 macio_on_hold = NULL;
700 return 0;
703 static void __devexit macio_pci_remove(struct pci_dev* pdev)
705 panic("removing of macio-asic not supported !\n");
709 * MacIO is matched against any Apple ID, it's probe() function
710 * will then decide wether it applies or not
712 static const struct pci_device_id __devinitdata pci_ids [] = { {
713 .vendor = PCI_VENDOR_ID_APPLE,
714 .device = PCI_ANY_ID,
715 .subvendor = PCI_ANY_ID,
716 .subdevice = PCI_ANY_ID,
718 }, { /* end: all zeroes */ }
720 MODULE_DEVICE_TABLE (pci, pci_ids);
722 /* pci driver glue; this is a "new style" PCI driver module */
723 static struct pci_driver macio_pci_driver = {
724 .name = (char *) "macio",
725 .id_table = pci_ids,
727 .probe = macio_pci_probe,
728 .remove = macio_pci_remove,
731 #endif /* CONFIG_PCI */
733 static int __init macio_module_init (void)
735 #ifdef CONFIG_PCI
736 int rc;
738 rc = pci_register_driver(&macio_pci_driver);
739 if (rc)
740 return rc;
741 #endif /* CONFIG_PCI */
742 return 0;
745 module_init(macio_module_init);
747 EXPORT_SYMBOL(macio_register_driver);
748 EXPORT_SYMBOL(macio_unregister_driver);
749 EXPORT_SYMBOL(macio_dev_get);
750 EXPORT_SYMBOL(macio_dev_put);
751 EXPORT_SYMBOL(macio_request_resource);
752 EXPORT_SYMBOL(macio_release_resource);
753 EXPORT_SYMBOL(macio_request_resources);
754 EXPORT_SYMBOL(macio_release_resources);