mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
[linux/fpc-iii.git] / arch / parisc / kernel / drivers.c
blob6a71d3151a232b03d9c42aef73a9ae2bc7e3f60e
1 /*
2 * drivers.c
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Copyright (c) 1999 The Puffin Group
10 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
11 * Copyright (c) 2001 Helge Deller <deller@gmx.de>
12 * Copyright (c) 2001,2002 Ryan Bradetich
13 * Copyright (c) 2004-2005 Thibaut VARENE <varenet@parisc-linux.org>
15 * The file handles registering devices and drivers, then matching them.
16 * It's the closest we get to a dating agency.
18 * If you're thinking about modifying this file, here are some gotchas to
19 * bear in mind:
20 * - 715/Mirage device paths have a dummy device between Lasi and its children
21 * - The EISA adapter may show up as a sibling or child of Wax
22 * - Dino has an optionally functional serial port. If firmware enables it,
23 * it shows up as a child of Dino. If firmware disables it, the buswalk
24 * finds it and it shows up as a child of Cujo
25 * - Dino has both parisc and pci devices as children
26 * - parisc devices are discovered in a random order, including children
27 * before parents in some cases.
30 #include <linux/slab.h>
31 #include <linux/types.h>
32 #include <linux/kernel.h>
33 #include <linux/pci.h>
34 #include <linux/spinlock.h>
35 #include <linux/string.h>
36 #include <linux/export.h>
37 #include <asm/hardware.h>
38 #include <asm/io.h>
39 #include <asm/pdc.h>
40 #include <asm/parisc-device.h>
42 /* See comments in include/asm-parisc/pci.h */
43 const struct dma_map_ops *hppa_dma_ops __read_mostly;
44 EXPORT_SYMBOL(hppa_dma_ops);
46 static struct device root = {
47 .init_name = "parisc",
50 static inline int check_dev(struct device *dev)
52 if (dev->bus == &parisc_bus_type) {
53 struct parisc_device *pdev;
54 pdev = to_parisc_device(dev);
55 return pdev->id.hw_type != HPHW_FAULTY;
57 return 1;
60 static struct device *
61 parse_tree_node(struct device *parent, int index, struct hardware_path *modpath);
63 struct recurse_struct {
64 void * obj;
65 int (*fn)(struct device *, void *);
68 static int descend_children(struct device * dev, void * data)
70 struct recurse_struct * recurse_data = (struct recurse_struct *)data;
72 if (recurse_data->fn(dev, recurse_data->obj))
73 return 1;
74 else
75 return device_for_each_child(dev, recurse_data, descend_children);
78 /**
79 * for_each_padev - Iterate over all devices in the tree
80 * @fn: Function to call for each device.
81 * @data: Data to pass to the called function.
83 * This performs a depth-first traversal of the tree, calling the
84 * function passed for each node. It calls the function for parents
85 * before children.
88 static int for_each_padev(int (*fn)(struct device *, void *), void * data)
90 struct recurse_struct recurse_data = {
91 .obj = data,
92 .fn = fn,
94 return device_for_each_child(&root, &recurse_data, descend_children);
97 /**
98 * match_device - Report whether this driver can handle this device
99 * @driver: the PA-RISC driver to try
100 * @dev: the PA-RISC device to try
102 static int match_device(struct parisc_driver *driver, struct parisc_device *dev)
104 const struct parisc_device_id *ids;
106 for (ids = driver->id_table; ids->sversion; ids++) {
107 if ((ids->sversion != SVERSION_ANY_ID) &&
108 (ids->sversion != dev->id.sversion))
109 continue;
111 if ((ids->hw_type != HWTYPE_ANY_ID) &&
112 (ids->hw_type != dev->id.hw_type))
113 continue;
115 if ((ids->hversion != HVERSION_ANY_ID) &&
116 (ids->hversion != dev->id.hversion))
117 continue;
119 return 1;
121 return 0;
124 static int parisc_driver_probe(struct device *dev)
126 int rc;
127 struct parisc_device *pa_dev = to_parisc_device(dev);
128 struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
130 rc = pa_drv->probe(pa_dev);
132 if (!rc)
133 pa_dev->driver = pa_drv;
135 return rc;
138 static int parisc_driver_remove(struct device *dev)
140 struct parisc_device *pa_dev = to_parisc_device(dev);
141 struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
142 if (pa_drv->remove)
143 pa_drv->remove(pa_dev);
145 return 0;
150 * register_parisc_driver - Register this driver if it can handle a device
151 * @driver: the PA-RISC driver to try
153 int register_parisc_driver(struct parisc_driver *driver)
155 /* FIXME: we need this because apparently the sti
156 * driver can be registered twice */
157 if(driver->drv.name) {
158 printk(KERN_WARNING
159 "BUG: skipping previously registered driver %s\n",
160 driver->name);
161 return 1;
164 if (!driver->probe) {
165 printk(KERN_WARNING
166 "BUG: driver %s has no probe routine\n",
167 driver->name);
168 return 1;
171 driver->drv.bus = &parisc_bus_type;
173 /* We install our own probe and remove routines */
174 WARN_ON(driver->drv.probe != NULL);
175 WARN_ON(driver->drv.remove != NULL);
177 driver->drv.name = driver->name;
179 return driver_register(&driver->drv);
181 EXPORT_SYMBOL(register_parisc_driver);
184 struct match_count {
185 struct parisc_driver * driver;
186 int count;
189 static int match_and_count(struct device * dev, void * data)
191 struct match_count * m = data;
192 struct parisc_device * pdev = to_parisc_device(dev);
194 if (check_dev(dev)) {
195 if (match_device(m->driver, pdev))
196 m->count++;
198 return 0;
202 * count_parisc_driver - count # of devices this driver would match
203 * @driver: the PA-RISC driver to try
205 * Use by IOMMU support to "guess" the right size IOPdir.
206 * Formula is something like memsize/(num_iommu * entry_size).
208 int count_parisc_driver(struct parisc_driver *driver)
210 struct match_count m = {
211 .driver = driver,
212 .count = 0,
215 for_each_padev(match_and_count, &m);
217 return m.count;
223 * unregister_parisc_driver - Unregister this driver from the list of drivers
224 * @driver: the PA-RISC driver to unregister
226 int unregister_parisc_driver(struct parisc_driver *driver)
228 driver_unregister(&driver->drv);
229 return 0;
231 EXPORT_SYMBOL(unregister_parisc_driver);
233 struct find_data {
234 unsigned long hpa;
235 struct parisc_device * dev;
238 static int find_device(struct device * dev, void * data)
240 struct parisc_device * pdev = to_parisc_device(dev);
241 struct find_data * d = (struct find_data*)data;
243 if (check_dev(dev)) {
244 if (pdev->hpa.start == d->hpa) {
245 d->dev = pdev;
246 return 1;
249 return 0;
252 static struct parisc_device *find_device_by_addr(unsigned long hpa)
254 struct find_data d = {
255 .hpa = hpa,
257 int ret;
259 ret = for_each_padev(find_device, &d);
260 return ret ? d.dev : NULL;
264 * find_pa_parent_type - Find a parent of a specific type
265 * @dev: The device to start searching from
266 * @type: The device type to search for.
268 * Walks up the device tree looking for a device of the specified type.
269 * If it finds it, it returns it. If not, it returns NULL.
271 const struct parisc_device *
272 find_pa_parent_type(const struct parisc_device *padev, int type)
274 const struct device *dev = &padev->dev;
275 while (dev != &root) {
276 struct parisc_device *candidate = to_parisc_device(dev);
277 if (candidate->id.hw_type == type)
278 return candidate;
279 dev = dev->parent;
282 return NULL;
286 * get_node_path fills in @path with the firmware path to the device.
287 * Note that if @node is a parisc device, we don't fill in the 'mod' field.
288 * This is because both callers pass the parent and fill in the mod
289 * themselves. If @node is a PCI device, we do fill it in, even though this
290 * is inconsistent.
292 static void get_node_path(struct device *dev, struct hardware_path *path)
294 int i = 5;
295 memset(&path->bc, -1, 6);
297 if (dev_is_pci(dev)) {
298 unsigned int devfn = to_pci_dev(dev)->devfn;
299 path->mod = PCI_FUNC(devfn);
300 path->bc[i--] = PCI_SLOT(devfn);
301 dev = dev->parent;
304 while (dev != &root) {
305 if (dev_is_pci(dev)) {
306 unsigned int devfn = to_pci_dev(dev)->devfn;
307 path->bc[i--] = PCI_SLOT(devfn) | (PCI_FUNC(devfn)<< 5);
308 } else if (dev->bus == &parisc_bus_type) {
309 path->bc[i--] = to_parisc_device(dev)->hw_path;
311 dev = dev->parent;
315 static char *print_hwpath(struct hardware_path *path, char *output)
317 int i;
318 for (i = 0; i < 6; i++) {
319 if (path->bc[i] == -1)
320 continue;
321 output += sprintf(output, "%u/", (unsigned char) path->bc[i]);
323 output += sprintf(output, "%u", (unsigned char) path->mod);
324 return output;
328 * print_pa_hwpath - Returns hardware path for PA devices
329 * dev: The device to return the path for
330 * output: Pointer to a previously-allocated array to place the path in.
332 * This function fills in the output array with a human-readable path
333 * to a PA device. This string is compatible with that used by PDC, and
334 * may be printed on the outside of the box.
336 char *print_pa_hwpath(struct parisc_device *dev, char *output)
338 struct hardware_path path;
340 get_node_path(dev->dev.parent, &path);
341 path.mod = dev->hw_path;
342 return print_hwpath(&path, output);
344 EXPORT_SYMBOL(print_pa_hwpath);
346 #if defined(CONFIG_PCI) || defined(CONFIG_ISA)
348 * get_pci_node_path - Determines the hardware path for a PCI device
349 * @pdev: The device to return the path for
350 * @path: Pointer to a previously-allocated array to place the path in.
352 * This function fills in the hardware_path structure with the route to
353 * the specified PCI device. This structure is suitable for passing to
354 * PDC calls.
356 void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path)
358 get_node_path(&pdev->dev, path);
360 EXPORT_SYMBOL(get_pci_node_path);
363 * print_pci_hwpath - Returns hardware path for PCI devices
364 * dev: The device to return the path for
365 * output: Pointer to a previously-allocated array to place the path in.
367 * This function fills in the output array with a human-readable path
368 * to a PCI device. This string is compatible with that used by PDC, and
369 * may be printed on the outside of the box.
371 char *print_pci_hwpath(struct pci_dev *dev, char *output)
373 struct hardware_path path;
375 get_pci_node_path(dev, &path);
376 return print_hwpath(&path, output);
378 EXPORT_SYMBOL(print_pci_hwpath);
380 #endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */
382 static void setup_bus_id(struct parisc_device *padev)
384 struct hardware_path path;
385 char name[28];
386 char *output = name;
387 int i;
389 get_node_path(padev->dev.parent, &path);
391 for (i = 0; i < 6; i++) {
392 if (path.bc[i] == -1)
393 continue;
394 output += sprintf(output, "%u:", (unsigned char) path.bc[i]);
396 sprintf(output, "%u", (unsigned char) padev->hw_path);
397 dev_set_name(&padev->dev, name);
400 struct parisc_device * create_tree_node(char id, struct device *parent)
402 struct parisc_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
403 if (!dev)
404 return NULL;
406 dev->hw_path = id;
407 dev->id.hw_type = HPHW_FAULTY;
409 dev->dev.parent = parent;
410 setup_bus_id(dev);
412 dev->dev.bus = &parisc_bus_type;
413 dev->dma_mask = 0xffffffffUL; /* PARISC devices are 32-bit */
415 /* make the generic dma mask a pointer to the parisc one */
416 dev->dev.dma_mask = &dev->dma_mask;
417 dev->dev.coherent_dma_mask = dev->dma_mask;
418 if (device_register(&dev->dev)) {
419 kfree(dev);
420 return NULL;
423 return dev;
426 struct match_id_data {
427 char id;
428 struct parisc_device * dev;
431 static int match_by_id(struct device * dev, void * data)
433 struct parisc_device * pdev = to_parisc_device(dev);
434 struct match_id_data * d = data;
436 if (pdev->hw_path == d->id) {
437 d->dev = pdev;
438 return 1;
440 return 0;
444 * alloc_tree_node - returns a device entry in the iotree
445 * @parent: the parent node in the tree
446 * @id: the element of the module path for this entry
448 * Checks all the children of @parent for a matching @id. If none
449 * found, it allocates a new device and returns it.
451 static struct parisc_device * __init alloc_tree_node(
452 struct device *parent, char id)
454 struct match_id_data d = {
455 .id = id,
457 if (device_for_each_child(parent, &d, match_by_id))
458 return d.dev;
459 else
460 return create_tree_node(id, parent);
463 static struct parisc_device *create_parisc_device(struct hardware_path *modpath)
465 int i;
466 struct device *parent = &root;
467 for (i = 0; i < 6; i++) {
468 if (modpath->bc[i] == -1)
469 continue;
470 parent = &alloc_tree_node(parent, modpath->bc[i])->dev;
472 return alloc_tree_node(parent, modpath->mod);
475 struct parisc_device *
476 alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path)
478 int status;
479 unsigned long bytecnt;
480 u8 iodc_data[32];
481 struct parisc_device *dev;
482 const char *name;
484 /* Check to make sure this device has not already been added - Ryan */
485 if (find_device_by_addr(hpa) != NULL)
486 return NULL;
488 status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32);
489 if (status != PDC_OK)
490 return NULL;
492 dev = create_parisc_device(mod_path);
493 if (dev->id.hw_type != HPHW_FAULTY) {
494 printk(KERN_ERR "Two devices have hardware path [%s]. "
495 "IODC data for second device: "
496 "%02x%02x%02x%02x%02x%02x\n"
497 "Rearranging GSC cards sometimes helps\n",
498 parisc_pathname(dev), iodc_data[0], iodc_data[1],
499 iodc_data[3], iodc_data[4], iodc_data[5], iodc_data[6]);
500 return NULL;
503 dev->id.hw_type = iodc_data[3] & 0x1f;
504 dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4);
505 dev->id.hversion_rev = iodc_data[1] & 0x0f;
506 dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) |
507 (iodc_data[5] << 8) | iodc_data[6];
508 dev->hpa.name = parisc_pathname(dev);
509 dev->hpa.start = hpa;
510 /* This is awkward. The STI spec says that gfx devices may occupy
511 * 32MB or 64MB. Unfortunately, we don't know how to tell whether
512 * it's the former or the latter. Assumptions either way can hurt us.
514 if (hpa == 0xf4000000 || hpa == 0xf8000000) {
515 dev->hpa.end = hpa + 0x03ffffff;
516 } else if (hpa == 0xf6000000 || hpa == 0xfa000000) {
517 dev->hpa.end = hpa + 0x01ffffff;
518 } else {
519 dev->hpa.end = hpa + 0xfff;
521 dev->hpa.flags = IORESOURCE_MEM;
522 name = parisc_hardware_description(&dev->id);
523 if (name) {
524 strlcpy(dev->name, name, sizeof(dev->name));
527 /* Silently fail things like mouse ports which are subsumed within
528 * the keyboard controller
530 if ((hpa & 0xfff) == 0 && insert_resource(&iomem_resource, &dev->hpa))
531 printk("Unable to claim HPA %lx for device %s\n",
532 hpa, name);
534 return dev;
537 static int parisc_generic_match(struct device *dev, struct device_driver *drv)
539 return match_device(to_parisc_driver(drv), to_parisc_device(dev));
542 static ssize_t make_modalias(struct device *dev, char *buf)
544 const struct parisc_device *padev = to_parisc_device(dev);
545 const struct parisc_device_id *id = &padev->id;
547 return sprintf(buf, "parisc:t%02Xhv%04Xrev%02Xsv%08X\n",
548 (u8)id->hw_type, (u16)id->hversion, (u8)id->hversion_rev,
549 (u32)id->sversion);
552 static int parisc_uevent(struct device *dev, struct kobj_uevent_env *env)
554 const struct parisc_device *padev;
555 char modalias[40];
557 if (!dev)
558 return -ENODEV;
560 padev = to_parisc_device(dev);
561 if (!padev)
562 return -ENODEV;
564 if (add_uevent_var(env, "PARISC_NAME=%s", padev->name))
565 return -ENOMEM;
567 make_modalias(dev, modalias);
568 if (add_uevent_var(env, "MODALIAS=%s", modalias))
569 return -ENOMEM;
571 return 0;
574 #define pa_dev_attr(name, field, format_string) \
575 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf) \
577 struct parisc_device *padev = to_parisc_device(dev); \
578 return sprintf(buf, format_string, padev->field); \
580 static DEVICE_ATTR_RO(name);
582 #define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format)
584 pa_dev_attr(irq, irq, "%u\n");
585 pa_dev_attr_id(hw_type, "0x%02x\n");
586 pa_dev_attr(rev, id.hversion_rev, "0x%x\n");
587 pa_dev_attr_id(hversion, "0x%03x\n");
588 pa_dev_attr_id(sversion, "0x%05x\n");
590 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
592 return make_modalias(dev, buf);
594 static DEVICE_ATTR_RO(modalias);
596 static struct attribute *parisc_device_attrs[] = {
597 &dev_attr_irq.attr,
598 &dev_attr_hw_type.attr,
599 &dev_attr_rev.attr,
600 &dev_attr_hversion.attr,
601 &dev_attr_sversion.attr,
602 &dev_attr_modalias.attr,
603 NULL,
605 ATTRIBUTE_GROUPS(parisc_device);
607 struct bus_type parisc_bus_type = {
608 .name = "parisc",
609 .match = parisc_generic_match,
610 .uevent = parisc_uevent,
611 .dev_groups = parisc_device_groups,
612 .probe = parisc_driver_probe,
613 .remove = parisc_driver_remove,
617 * register_parisc_device - Locate a driver to manage this device.
618 * @dev: The parisc device.
620 * Search the driver list for a driver that is willing to manage
621 * this device.
623 int register_parisc_device(struct parisc_device *dev)
625 if (!dev)
626 return 0;
628 if (dev->driver)
629 return 1;
631 return 0;
635 * match_pci_device - Matches a pci device against a given hardware path
636 * entry.
637 * @dev: the generic device (known to be contained by a pci_dev).
638 * @index: the current BC index
639 * @modpath: the hardware path.
640 * @return: true if the device matches the hardware path.
642 static int match_pci_device(struct device *dev, int index,
643 struct hardware_path *modpath)
645 struct pci_dev *pdev = to_pci_dev(dev);
646 int id;
648 if (index == 5) {
649 /* we are at the end of the path, and on the actual device */
650 unsigned int devfn = pdev->devfn;
651 return ((modpath->bc[5] == PCI_SLOT(devfn)) &&
652 (modpath->mod == PCI_FUNC(devfn)));
655 /* index might be out of bounds for bc[] */
656 if (index >= 6)
657 return 0;
659 id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5);
660 return (modpath->bc[index] == id);
664 * match_parisc_device - Matches a parisc device against a given hardware
665 * path entry.
666 * @dev: the generic device (known to be contained by a parisc_device).
667 * @index: the current BC index
668 * @modpath: the hardware path.
669 * @return: true if the device matches the hardware path.
671 static int match_parisc_device(struct device *dev, int index,
672 struct hardware_path *modpath)
674 struct parisc_device *curr = to_parisc_device(dev);
675 char id = (index == 6) ? modpath->mod : modpath->bc[index];
677 return (curr->hw_path == id);
680 struct parse_tree_data {
681 int index;
682 struct hardware_path * modpath;
683 struct device * dev;
686 static int check_parent(struct device * dev, void * data)
688 struct parse_tree_data * d = data;
690 if (check_dev(dev)) {
691 if (dev->bus == &parisc_bus_type) {
692 if (match_parisc_device(dev, d->index, d->modpath))
693 d->dev = dev;
694 } else if (dev_is_pci(dev)) {
695 if (match_pci_device(dev, d->index, d->modpath))
696 d->dev = dev;
697 } else if (dev->bus == NULL) {
698 /* we are on a bus bridge */
699 struct device *new = parse_tree_node(dev, d->index, d->modpath);
700 if (new)
701 d->dev = new;
704 return d->dev != NULL;
708 * parse_tree_node - returns a device entry in the iotree
709 * @parent: the parent node in the tree
710 * @index: the current BC index
711 * @modpath: the hardware_path struct to match a device against
712 * @return: The corresponding device if found, NULL otherwise.
714 * Checks all the children of @parent for a matching @id. If none
715 * found, it returns NULL.
717 static struct device *
718 parse_tree_node(struct device *parent, int index, struct hardware_path *modpath)
720 struct parse_tree_data d = {
721 .index = index,
722 .modpath = modpath,
725 struct recurse_struct recurse_data = {
726 .obj = &d,
727 .fn = check_parent,
730 if (device_for_each_child(parent, &recurse_data, descend_children))
731 /* nothing */;
733 return d.dev;
737 * hwpath_to_device - Finds the generic device corresponding to a given hardware path.
738 * @modpath: the hardware path.
739 * @return: The target device, NULL if not found.
741 struct device *hwpath_to_device(struct hardware_path *modpath)
743 int i;
744 struct device *parent = &root;
745 for (i = 0; i < 6; i++) {
746 if (modpath->bc[i] == -1)
747 continue;
748 parent = parse_tree_node(parent, i, modpath);
749 if (!parent)
750 return NULL;
752 if (dev_is_pci(parent)) /* pci devices already parse MOD */
753 return parent;
754 else
755 return parse_tree_node(parent, 6, modpath);
757 EXPORT_SYMBOL(hwpath_to_device);
760 * device_to_hwpath - Populates the hwpath corresponding to the given device.
761 * @param dev the target device
762 * @param path pointer to a previously allocated hwpath struct to be filled in
764 void device_to_hwpath(struct device *dev, struct hardware_path *path)
766 struct parisc_device *padev;
767 if (dev->bus == &parisc_bus_type) {
768 padev = to_parisc_device(dev);
769 get_node_path(dev->parent, path);
770 path->mod = padev->hw_path;
771 } else if (dev_is_pci(dev)) {
772 get_node_path(dev, path);
775 EXPORT_SYMBOL(device_to_hwpath);
777 #define BC_PORT_MASK 0x8
778 #define BC_LOWER_PORT 0x8
780 #define BUS_CONVERTER(dev) \
781 ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT))
783 #define IS_LOWER_PORT(dev) \
784 ((gsc_readl(dev->hpa.start + offsetof(struct bc_module, io_status)) \
785 & BC_PORT_MASK) == BC_LOWER_PORT)
787 #define MAX_NATIVE_DEVICES 64
788 #define NATIVE_DEVICE_OFFSET 0x1000
790 #define FLEX_MASK F_EXTEND(0xfffc0000)
791 #define IO_IO_LOW offsetof(struct bc_module, io_io_low)
792 #define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
793 #define READ_IO_IO_LOW(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_LOW)
794 #define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_HIGH)
796 static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
797 struct device *parent);
799 void walk_lower_bus(struct parisc_device *dev)
801 unsigned long io_io_low, io_io_high;
803 if (!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev))
804 return;
806 if (dev->id.hw_type == HPHW_IOA) {
807 io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16);
808 io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET;
809 } else {
810 io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK;
811 io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK;
814 walk_native_bus(io_io_low, io_io_high, &dev->dev);
818 * walk_native_bus -- Probe a bus for devices
819 * @io_io_low: Base address of this bus.
820 * @io_io_high: Last address of this bus.
821 * @parent: The parent bus device.
823 * A native bus (eg Runway or GSC) may have up to 64 devices on it,
824 * spaced at intervals of 0x1000 bytes. PDC may not inform us of these
825 * devices, so we have to probe for them. Unfortunately, we may find
826 * devices which are not physically connected (such as extra serial &
827 * keyboard ports). This problem is not yet solved.
829 static void __init walk_native_bus(unsigned long io_io_low,
830 unsigned long io_io_high, struct device *parent)
832 int i, devices_found = 0;
833 unsigned long hpa = io_io_low;
834 struct hardware_path path;
836 get_node_path(parent, &path);
837 do {
838 for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += NATIVE_DEVICE_OFFSET) {
839 struct parisc_device *dev;
841 /* Was the device already added by Firmware? */
842 dev = find_device_by_addr(hpa);
843 if (!dev) {
844 path.mod = i;
845 dev = alloc_pa_dev(hpa, &path);
846 if (!dev)
847 continue;
849 register_parisc_device(dev);
850 devices_found++;
852 walk_lower_bus(dev);
854 } while(!devices_found && hpa < io_io_high);
857 #define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000)
860 * walk_central_bus - Find devices attached to the central bus
862 * PDC doesn't tell us about all devices in the system. This routine
863 * finds devices connected to the central bus.
865 void walk_central_bus(void)
867 walk_native_bus(CENTRAL_BUS_ADDR,
868 CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET),
869 &root);
872 static void print_parisc_device(struct parisc_device *dev)
874 char hw_path[64];
875 static int count;
877 print_pa_hwpath(dev, hw_path);
878 printk(KERN_INFO "%d. %s at 0x%p [%s] { %d, 0x%x, 0x%.3x, 0x%.5x }",
879 ++count, dev->name, (void*) dev->hpa.start, hw_path, dev->id.hw_type,
880 dev->id.hversion_rev, dev->id.hversion, dev->id.sversion);
882 if (dev->num_addrs) {
883 int k;
884 pr_cont(", additional addresses: ");
885 for (k = 0; k < dev->num_addrs; k++)
886 pr_cont("0x%lx ", dev->addr[k]);
888 pr_cont("\n");
892 * init_parisc_bus - Some preparation to be done before inventory
894 void init_parisc_bus(void)
896 if (bus_register(&parisc_bus_type))
897 panic("Could not register PA-RISC bus type\n");
898 if (device_register(&root))
899 panic("Could not register PA-RISC root device\n");
900 get_device(&root);
904 static int print_one_device(struct device * dev, void * data)
906 struct parisc_device * pdev = to_parisc_device(dev);
908 if (check_dev(dev))
909 print_parisc_device(pdev);
910 return 0;
914 * print_parisc_devices - Print out a list of devices found in this system
916 void print_parisc_devices(void)
918 for_each_padev(print_one_device, NULL);