2 * Bus & driver management routines for devices within
3 * a MacIO ASIC. Interface to new driver model mostly
4 * stolen from the PCI version.
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.
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
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>
33 #include <asm/pci-bridge.h>
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;
50 return of_match_device(matches, &macio_dev->ofdev) != NULL;
53 struct macio_dev *macio_dev_get(struct macio_dev *dev)
59 tmp = get_device(&dev->ofdev.dev);
61 return to_macio_device(tmp);
66 void macio_dev_put(struct macio_dev *dev)
69 put_device(&dev->ofdev.dev);
73 static int macio_device_probe(struct device *dev)
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);
86 macio_dev_get(macio_dev);
88 match = of_match_device(drv->match_table, &macio_dev->ofdev);
90 error = drv->probe(macio_dev, match);
92 macio_dev_put(macio_dev);
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);
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);
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);
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, *compat2;
145 int length, cplen, cplen2, seen = 0;
150 macio_dev = to_macio_device(dev);
154 of = &macio_dev->ofdev;
156 /* stuff we want to pass to /sbin/hotplug */
157 envp[i++] = scratch = buffer;
158 length = scnprintf (scratch, buffer_size, "OF_NAME=%s", of->node->name);
160 buffer_size -= length;
161 if ((buffer_size <= 0) || (i >= num_envp))
166 length = scnprintf (scratch, buffer_size, "OF_TYPE=%s", of->node->type);
168 buffer_size -= length;
169 if ((buffer_size <= 0) || (i >= num_envp))
173 /* Since the compatible field can contain pretty much anything
174 * it's not really legal to split it out with commas. We split it
175 * up using a number of environment variables instead. */
177 compat = (char *) get_property(of->node, "compatible", &cplen);
180 while (compat && cplen > 0) {
182 length = scnprintf (scratch, buffer_size,
183 "OF_COMPATIBLE_%d=%s", seen, compat);
185 buffer_size -= length;
186 if ((buffer_size <= 0) || (i >= num_envp))
189 length = strlen (compat) + 1;
196 length = scnprintf (scratch, buffer_size, "OF_COMPATIBLE_N=%d", seen);
198 buffer_size -= length;
199 if ((buffer_size <= 0) || (i >= num_envp))
204 length = scnprintf (scratch, buffer_size, "MODALIAS=of:N%sT%s",
205 of->node->name, of->node->type);
207 buffer_size -= length;
208 if ((buffer_size <= 0) || (i >= num_envp))
217 length = snprintf (scratch, buffer_size, "C%s", compat2);
218 buffer_size -= length;
219 if (buffer_size <= 0)
222 length = strlen (compat2) + 1;
232 extern struct device_attribute macio_dev_attrs[];
234 struct bus_type macio_bus_type = {
236 .match = macio_bus_match,
237 .uevent = macio_uevent,
238 .probe = macio_device_probe,
239 .remove = macio_device_remove,
240 .shutdown = macio_device_shutdown,
241 .suspend = macio_device_suspend,
242 .resume = macio_device_resume,
243 .dev_attrs = macio_dev_attrs,
246 static int __init macio_bus_driver_init(void)
248 return bus_register(&macio_bus_type);
251 postcore_initcall(macio_bus_driver_init);
255 * macio_release_dev - free a macio device structure when all users of it are
257 * @dev: device that's been disconnected
259 * Will be called only by the device core when all users of this macio device
260 * are done. This currently means never as we don't hot remove any macio
261 * device yet, though that will happen with mediabay based devices in a later
264 static void macio_release_dev(struct device *dev)
266 struct macio_dev *mdev;
268 mdev = to_macio_device(dev);
273 * macio_resource_quirks - tweak or skip some resources for a device
274 * @np: pointer to the device node
275 * @res: resulting resource
276 * @index: index of resource in node
278 * If this routine returns non-null, then the resource is completely
281 static int macio_resource_quirks(struct device_node *np, struct resource *res,
284 if (res->flags & IORESOURCE_MEM) {
285 /* Grand Central has too large resource 0 on some machines */
286 if (index == 0 && !strcmp(np->name, "gc"))
287 res->end = res->start + 0x1ffff;
289 /* Airport has bogus resource 2 */
290 if (index >= 2 && !strcmp(np->name, "radio"))
294 /* DBDMAs may have bogus sizes */
295 if ((res->start & 0x0001f000) == 0x00008000)
296 res->end = res->start + 0xff;
297 #endif /* CONFIG_PPC64 */
299 /* ESCC parent eats child resources. We could have added a
300 * level of hierarchy, but I don't really feel the need
303 if (!strcmp(np->name, "escc"))
306 /* ESCC has bogus resources >= 3 */
307 if (index >= 3 && !(strcmp(np->name, "ch-a") &&
308 strcmp(np->name, "ch-b")))
311 /* Media bay has too many resources, keep only first one */
312 if (index > 0 && !strcmp(np->name, "media-bay"))
315 /* Some older IDE resources have bogus sizes */
316 if (!(strcmp(np->name, "IDE") && strcmp(np->name, "ATA") &&
317 strcmp(np->type, "ide") && strcmp(np->type, "ata"))) {
318 if (index == 0 && (res->end - res->start) > 0xfff)
319 res->end = res->start + 0xfff;
320 if (index == 1 && (res->end - res->start) > 0xff)
321 res->end = res->start + 0xff;
328 static void macio_setup_interrupts(struct macio_dev *dev)
330 struct device_node *np = dev->ofdev.node;
333 /* For now, we use pre-parsed entries in the device-tree for
334 * interrupt routing and addresses, but we should change that
335 * to dynamically parsed entries and so get rid of most of the
336 * clutter in struct device_node
338 for (i = j = 0; i < np->n_intrs; i++) {
339 struct resource *res = &dev->interrupt[j];
341 if (j >= MACIO_DEV_COUNT_IRQS)
343 res->start = np->intrs[i].line;
344 res->flags = IORESOURCE_IO;
345 if (np->intrs[j].sense)
346 res->flags |= IORESOURCE_IRQ_LOWLEVEL;
348 res->flags |= IORESOURCE_IRQ_HIGHEDGE;
349 res->name = dev->ofdev.dev.bus_id;
350 if (macio_resource_quirks(np, res, i))
351 memset(res, 0, sizeof(struct resource));
355 dev->n_interrupts = j;
358 static void macio_setup_resources(struct macio_dev *dev,
359 struct resource *parent_res)
361 struct device_node *np = dev->ofdev.node;
365 for (index = 0; of_address_to_resource(np, index, &r) == 0; index++) {
366 struct resource *res = &dev->resource[index];
367 if (index >= MACIO_DEV_COUNT_RESOURCES)
370 res->name = dev->ofdev.dev.bus_id;
372 if (macio_resource_quirks(np, res, index)) {
373 memset(res, 0, sizeof(struct resource));
376 /* Currently, we consider failure as harmless, this may
377 * change in the future, once I've found all the device
378 * tree bugs in older machines & worked around them
380 if (insert_resource(parent_res, res)) {
381 printk(KERN_WARNING "Can't request resource "
382 "%d for MacIO device %s\n",
383 index, dev->ofdev.dev.bus_id);
386 dev->n_resources = index;
390 * macio_add_one_device - Add one device from OF node to the device tree
391 * @chip: pointer to the macio_chip holding the device
392 * @np: pointer to the device node in the OF tree
393 * @in_bay: set to 1 if device is part of a media-bay
395 * When media-bay is changed to hotswap drivers, this function will
396 * be exposed to the bay driver some way...
398 static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
399 struct device *parent,
400 struct device_node *np,
401 struct macio_dev *in_bay,
402 struct resource *parent_res)
404 struct macio_dev *dev;
410 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
413 memset(dev, 0, sizeof(*dev));
415 dev->bus = &chip->lbus;
416 dev->media_bay = in_bay;
417 dev->ofdev.node = np;
418 dev->ofdev.dma_mask = 0xffffffffUL;
419 dev->ofdev.dev.dma_mask = &dev->ofdev.dma_mask;
420 dev->ofdev.dev.parent = parent;
421 dev->ofdev.dev.bus = &macio_bus_type;
422 dev->ofdev.dev.release = macio_release_dev;
425 printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n",
426 dev, &dev->ofdev, &dev->ofdev.dev, &dev->ofdev.dev.kobj);
429 /* MacIO itself has a different reg, we use it's PCI base */
430 if (np == chip->of_node) {
431 sprintf(dev->ofdev.dev.bus_id, "%1d.%08lx:%.*s",
434 pci_resource_start(chip->lbus.pdev, 0),
436 0, /* NuBus may want to do something better here */
438 MAX_NODE_NAME_SIZE, np->name);
440 reg = (u32 *)get_property(np, "reg", NULL);
441 sprintf(dev->ofdev.dev.bus_id, "%1d.%08x:%.*s",
443 reg ? *reg : 0, MAX_NODE_NAME_SIZE, np->name);
446 /* Setup interrupts & resources */
447 macio_setup_interrupts(dev);
448 macio_setup_resources(dev, parent_res);
450 /* Register with core */
451 if (of_device_register(&dev->ofdev) != 0) {
452 printk(KERN_DEBUG"macio: device registration error for %s!\n",
453 dev->ofdev.dev.bus_id);
461 static int macio_skip_device(struct device_node *np)
463 if (strncmp(np->name, "battery", 7) == 0)
465 if (strncmp(np->name, "escc-legacy", 11) == 0)
471 * macio_pci_add_devices - Adds sub-devices of mac-io to the device tree
472 * @chip: pointer to the macio_chip holding the devices
474 * This function will do the job of extracting devices from the
475 * Open Firmware device tree, build macio_dev structures and add
476 * them to the Linux device tree.
478 * For now, childs of media-bay are added now as well. This will
481 static void macio_pci_add_devices(struct macio_chip *chip)
483 struct device_node *np, *pnode;
484 struct macio_dev *rdev, *mdev, *mbdev = NULL, *sdev = NULL;
485 struct device *parent = NULL;
486 struct resource *root_res = &iomem_resource;
488 /* Add a node for the macio bus itself */
490 if (chip->lbus.pdev) {
491 parent = &chip->lbus.pdev->dev;
492 root_res = &chip->lbus.pdev->resource[0];
495 pnode = of_node_get(chip->of_node);
499 /* Add macio itself to hierarchy */
500 rdev = macio_add_one_device(chip, parent, pnode, NULL, root_res);
503 root_res = &rdev->resource[0];
505 /* First scan 1st level */
506 for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
507 if (macio_skip_device(np))
510 mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL,
514 else if (strncmp(np->name, "media-bay", 9) == 0)
516 else if (strncmp(np->name, "escc", 4) == 0)
520 /* Add media bay devices if any */
522 for (np = NULL; (np = of_get_next_child(mbdev->ofdev.node, np))
524 if (macio_skip_device(np))
527 if (macio_add_one_device(chip, &mbdev->ofdev.dev, np,
528 mbdev, root_res) == NULL)
532 /* Add serial ports if any */
534 for (np = NULL; (np = of_get_next_child(sdev->ofdev.node, np))
536 if (macio_skip_device(np))
539 if (macio_add_one_device(chip, &sdev->ofdev.dev, np,
540 NULL, root_res) == NULL)
548 * macio_register_driver - Registers a new MacIO device driver
549 * @drv: pointer to the driver definition structure
551 int macio_register_driver(struct macio_driver *drv)
553 /* initialize common driver fields */
554 drv->driver.name = drv->name;
555 drv->driver.bus = &macio_bus_type;
557 /* register with core */
558 return driver_register(&drv->driver);
562 * macio_unregister_driver - Unregisters a new MacIO device driver
563 * @drv: pointer to the driver definition structure
565 void macio_unregister_driver(struct macio_driver *drv)
567 driver_unregister(&drv->driver);
571 * macio_request_resource - Request an MMIO resource
572 * @dev: pointer to the device holding the resource
573 * @resource_no: resource number to request
574 * @name: resource name
576 * Mark memory region number @resource_no associated with MacIO
577 * device @dev as being reserved by owner @name. Do not access
578 * any address inside the memory regions unless this call returns
581 * Returns 0 on success, or %EBUSY on error. A warning
582 * message is also printed on failure.
584 int macio_request_resource(struct macio_dev *dev, int resource_no,
587 if (macio_resource_len(dev, resource_no) == 0)
590 if (!request_mem_region(macio_resource_start(dev, resource_no),
591 macio_resource_len(dev, resource_no),
598 printk (KERN_WARNING "MacIO: Unable to reserve resource #%d:%lx@%lx"
601 macio_resource_len(dev, resource_no),
602 macio_resource_start(dev, resource_no),
603 dev->ofdev.dev.bus_id);
608 * macio_release_resource - Release an MMIO resource
609 * @dev: pointer to the device holding the resource
610 * @resource_no: resource number to release
612 void macio_release_resource(struct macio_dev *dev, int resource_no)
614 if (macio_resource_len(dev, resource_no) == 0)
616 release_mem_region(macio_resource_start(dev, resource_no),
617 macio_resource_len(dev, resource_no));
621 * macio_request_resources - Reserve all memory resources
622 * @dev: MacIO device whose resources are to be reserved
623 * @name: Name to be associated with resource.
625 * Mark all memory regions associated with MacIO device @dev as
626 * being reserved by owner @name. Do not access any address inside
627 * the memory regions unless this call returns successfully.
629 * Returns 0 on success, or %EBUSY on error. A warning
630 * message is also printed on failure.
632 int macio_request_resources(struct macio_dev *dev, const char *name)
636 for (i = 0; i < dev->n_resources; i++)
637 if (macio_request_resource(dev, i, name))
643 macio_release_resource(dev, i);
649 * macio_release_resources - Release reserved memory resources
650 * @dev: MacIO device whose resources were previously reserved
653 void macio_release_resources(struct macio_dev *dev)
657 for (i = 0; i < dev->n_resources; i++)
658 macio_release_resource(dev, i);
664 static int __devinit macio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
666 struct device_node* np;
667 struct macio_chip* chip;
669 if (ent->vendor != PCI_VENDOR_ID_APPLE)
672 /* Note regarding refcounting: We assume pci_device_to_OF_node() is
673 * ported to new OF APIs and returns a node with refcount incremented.
675 np = pci_device_to_OF_node(pdev);
679 /* The above assumption is wrong !!!
680 * fix that here for now until I fix the arch code
684 /* We also assume that pmac_feature will have done a get() on nodes
685 * stored in the macio chips array
687 chip = macio_find(np, macio_unknown);
692 /* XXX Need locking ??? */
693 if (chip->lbus.pdev == NULL) {
694 chip->lbus.pdev = pdev;
695 chip->lbus.chip = chip;
696 pci_set_drvdata(pdev, &chip->lbus);
697 pci_set_master(pdev);
700 printk(KERN_INFO "MacIO PCI driver attached to %s chipset\n",
704 * HACK ALERT: The WallStreet PowerBook and some OHare based machines
705 * have 2 macio ASICs. I must probe the "main" one first or IDE
706 * ordering will be incorrect. So I put on "hold" the second one since
707 * it seem to appear first on PCI
709 if (chip->type == macio_gatwick || chip->type == macio_ohareII)
710 if (macio_chips[0].lbus.pdev == NULL) {
711 macio_on_hold = chip;
715 macio_pci_add_devices(chip);
716 if (macio_on_hold && macio_chips[0].lbus.pdev != NULL) {
717 macio_pci_add_devices(macio_on_hold);
718 macio_on_hold = NULL;
724 static void __devexit macio_pci_remove(struct pci_dev* pdev)
726 panic("removing of macio-asic not supported !\n");
730 * MacIO is matched against any Apple ID, it's probe() function
731 * will then decide wether it applies or not
733 static const struct pci_device_id __devinitdata pci_ids [] = { {
734 .vendor = PCI_VENDOR_ID_APPLE,
735 .device = PCI_ANY_ID,
736 .subvendor = PCI_ANY_ID,
737 .subdevice = PCI_ANY_ID,
739 }, { /* end: all zeroes */ }
741 MODULE_DEVICE_TABLE (pci, pci_ids);
743 /* pci driver glue; this is a "new style" PCI driver module */
744 static struct pci_driver macio_pci_driver = {
745 .name = (char *) "macio",
748 .probe = macio_pci_probe,
749 .remove = macio_pci_remove,
752 #endif /* CONFIG_PCI */
754 static int __init macio_module_init (void)
759 rc = pci_register_driver(&macio_pci_driver);
762 #endif /* CONFIG_PCI */
766 module_init(macio_module_init);
768 EXPORT_SYMBOL(macio_register_driver);
769 EXPORT_SYMBOL(macio_unregister_driver);
770 EXPORT_SYMBOL(macio_dev_get);
771 EXPORT_SYMBOL(macio_dev_put);
772 EXPORT_SYMBOL(macio_request_resource);
773 EXPORT_SYMBOL(macio_release_resource);
774 EXPORT_SYMBOL(macio_request_resources);
775 EXPORT_SYMBOL(macio_release_resources);