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1/*
2 * drivers.c
3 *
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.
8 *
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>
14 *
15 * The file handles registering devices and drivers, then matching them.
16 * It's the closest we get to a dating agency.
17 *
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.
28 */
29
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>
41
42/* See comments in include/asm-parisc/pci.h */
43struct dma_map_ops *hppa_dma_ops __read_mostly;
44EXPORT_SYMBOL(hppa_dma_ops);
45
46static struct device root = {
47 .init_name = "parisc",
48};
49
50static inline int check_dev(struct device *dev)
51{
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;
56 }
57 return 1;
58}
59
60static struct device *
61parse_tree_node(struct device *parent, int index, struct hardware_path *modpath);
62
63struct recurse_struct {
64 void * obj;
65 int (*fn)(struct device *, void *);
66};
67
68static int descend_children(struct device * dev, void * data)
69{
70 struct recurse_struct * recurse_data = (struct recurse_struct *)data;
71
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);
76}
77
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.
82 *
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.
86 */
87
88static int for_each_padev(int (*fn)(struct device *, void *), void * data)
89{
90 struct recurse_struct recurse_data = {
91 .obj = data,
92 .fn = fn,
93 };
94 return device_for_each_child(&root, &recurse_data, descend_children);
95}
96
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
101 */
102static int match_device(struct parisc_driver *driver, struct parisc_device *dev)
103{
104 const struct parisc_device_id *ids;
105
106 for (ids = driver->id_table; ids->sversion; ids++) {
107 if ((ids->sversion != SVERSION_ANY_ID) &&
108 (ids->sversion != dev->id.sversion))
109 continue;
110
111 if ((ids->hw_type != HWTYPE_ANY_ID) &&
112 (ids->hw_type != dev->id.hw_type))
113 continue;
114
115 if ((ids->hversion != HVERSION_ANY_ID) &&
116 (ids->hversion != dev->id.hversion))
117 continue;
118
119 return 1;
120 }
121 return 0;
122}
123
124static int parisc_driver_probe(struct device *dev)
125{
126 int rc;
127 struct parisc_device *pa_dev = to_parisc_device(dev);
128 struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
129
130 rc = pa_drv->probe(pa_dev);
131
132 if (!rc)
133 pa_dev->driver = pa_drv;
134
135 return rc;
136}
137
138static int parisc_driver_remove(struct device *dev)
139{
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);
144
145 return 0;
146}
147
148
149/**
150 * register_parisc_driver - Register this driver if it can handle a device
151 * @driver: the PA-RISC driver to try
152 */
153int register_parisc_driver(struct parisc_driver *driver)
154{
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;
162 }
163
164 if (!driver->probe) {
165 printk(KERN_WARNING
166 "BUG: driver %s has no probe routine\n",
167 driver->name);
168 return 1;
169 }
170
171 driver->drv.bus = &parisc_bus_type;
172
173 /* We install our own probe and remove routines */
174 WARN_ON(driver->drv.probe != NULL);
175 WARN_ON(driver->drv.remove != NULL);
176
177 driver->drv.name = driver->name;
178
179 return driver_register(&driver->drv);
180}
181EXPORT_SYMBOL(register_parisc_driver);
182
183
184struct match_count {
185 struct parisc_driver * driver;
186 int count;
187};
188
189static int match_and_count(struct device * dev, void * data)
190{
191 struct match_count * m = data;
192 struct parisc_device * pdev = to_parisc_device(dev);
193
194 if (check_dev(dev)) {
195 if (match_device(m->driver, pdev))
196 m->count++;
197 }
198 return 0;
199}
200
201/**
202 * count_parisc_driver - count # of devices this driver would match
203 * @driver: the PA-RISC driver to try
204 *
205 * Use by IOMMU support to "guess" the right size IOPdir.
206 * Formula is something like memsize/(num_iommu * entry_size).
207 */
208int count_parisc_driver(struct parisc_driver *driver)
209{
210 struct match_count m = {
211 .driver = driver,
212 .count = 0,
213 };
214
215 for_each_padev(match_and_count, &m);
216
217 return m.count;
218}
219
220
221
222/**
223 * unregister_parisc_driver - Unregister this driver from the list of drivers
224 * @driver: the PA-RISC driver to unregister
225 */
226int unregister_parisc_driver(struct parisc_driver *driver)
227{
228 driver_unregister(&driver->drv);
229 return 0;
230}
231EXPORT_SYMBOL(unregister_parisc_driver);
232
233struct find_data {
234 unsigned long hpa;
235 struct parisc_device * dev;
236};
237
238static int find_device(struct device * dev, void * data)
239{
240 struct parisc_device * pdev = to_parisc_device(dev);
241 struct find_data * d = (struct find_data*)data;
242
243 if (check_dev(dev)) {
244 if (pdev->hpa.start == d->hpa) {
245 d->dev = pdev;
246 return 1;
247 }
248 }
249 return 0;
250}
251
252static struct parisc_device *find_device_by_addr(unsigned long hpa)
253{
254 struct find_data d = {
255 .hpa = hpa,
256 };
257 int ret;
258
259 ret = for_each_padev(find_device, &d);
260 return ret ? d.dev : NULL;
261}
262
263/**
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.
267 *
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.
270 */
271const struct parisc_device *
272find_pa_parent_type(const struct parisc_device *padev, int type)
273{
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;
280 }
281
282 return NULL;
283}
284
285/*
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.
291 */
292static void get_node_path(struct device *dev, struct hardware_path *path)
293{
294 int i = 5;
295 memset(&path->bc, -1, 6);
296
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;
302 }
303
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;
310 }
311 dev = dev->parent;
312 }
313}
314
315static char *print_hwpath(struct hardware_path *path, char *output)
316{
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]);
322 }
323 output += sprintf(output, "%u", (unsigned char) path->mod);
324 return output;
325}
326
327/**
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.
331 *
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.
335 */
336char *print_pa_hwpath(struct parisc_device *dev, char *output)
337{
338 struct hardware_path path;
339
340 get_node_path(dev->dev.parent, &path);
341 path.mod = dev->hw_path;
342 return print_hwpath(&path, output);
343}
344EXPORT_SYMBOL(print_pa_hwpath);
345
346#if defined(CONFIG_PCI) || defined(CONFIG_ISA)
347/**
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.
351 *
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.
355 */
356void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path)
357{
358 get_node_path(&pdev->dev, path);
359}
360EXPORT_SYMBOL(get_pci_node_path);
361
362/**
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.
366 *
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.
370 */
371char *print_pci_hwpath(struct pci_dev *dev, char *output)
372{
373 struct hardware_path path;
374
375 get_pci_node_path(dev, &path);
376 return print_hwpath(&path, output);
377}
378EXPORT_SYMBOL(print_pci_hwpath);
379
380#endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */
381
382static void setup_bus_id(struct parisc_device *padev)
383{
384 struct hardware_path path;
385 char name[28];
386 char *output = name;
387 int i;
388
389 get_node_path(padev->dev.parent, &path);
390
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]);
395 }
396 sprintf(output, "%u", (unsigned char) padev->hw_path);
397 dev_set_name(&padev->dev, name);
398}
399
400struct parisc_device * create_tree_node(char id, struct device *parent)
401{
402 struct parisc_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
403 if (!dev)
404 return NULL;
405
406 dev->hw_path = id;
407 dev->id.hw_type = HPHW_FAULTY;
408
409 dev->dev.parent = parent;
410 setup_bus_id(dev);
411
412 dev->dev.bus = &parisc_bus_type;
413 dev->dma_mask = 0xffffffffUL; /* PARISC devices are 32-bit */
414
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;
421 }
422
423 return dev;
424}
425
426struct match_id_data {
427 char id;
428 struct parisc_device * dev;
429};
430
431static int match_by_id(struct device * dev, void * data)
432{
433 struct parisc_device * pdev = to_parisc_device(dev);
434 struct match_id_data * d = data;
435
436 if (pdev->hw_path == d->id) {
437 d->dev = pdev;
438 return 1;
439 }
440 return 0;
441}
442
443/**
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
447 *
448 * Checks all the children of @parent for a matching @id. If none
449 * found, it allocates a new device and returns it.
450 */
451static struct parisc_device * alloc_tree_node(struct device *parent, char id)
452{
453 struct match_id_data d = {
454 .id = id,
455 };
456 if (device_for_each_child(parent, &d, match_by_id))
457 return d.dev;
458 else
459 return create_tree_node(id, parent);
460}
461
462static struct parisc_device *create_parisc_device(struct hardware_path *modpath)
463{
464 int i;
465 struct device *parent = &root;
466 for (i = 0; i < 6; i++) {
467 if (modpath->bc[i] == -1)
468 continue;
469 parent = &alloc_tree_node(parent, modpath->bc[i])->dev;
470 }
471 return alloc_tree_node(parent, modpath->mod);
472}
473
474struct parisc_device *
475alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path)
476{
477 int status;
478 unsigned long bytecnt;
479 u8 iodc_data[32];
480 struct parisc_device *dev;
481 const char *name;
482
483 /* Check to make sure this device has not already been added - Ryan */
484 if (find_device_by_addr(hpa) != NULL)
485 return NULL;
486
487 status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32);
488 if (status != PDC_OK)
489 return NULL;
490
491 dev = create_parisc_device(mod_path);
492 if (dev->id.hw_type != HPHW_FAULTY) {
493 printk(KERN_ERR "Two devices have hardware path [%s]. "
494 "IODC data for second device: "
495 "%02x%02x%02x%02x%02x%02x\n"
496 "Rearranging GSC cards sometimes helps\n",
497 parisc_pathname(dev), iodc_data[0], iodc_data[1],
498 iodc_data[3], iodc_data[4], iodc_data[5], iodc_data[6]);
499 return NULL;
500 }
501
502 dev->id.hw_type = iodc_data[3] & 0x1f;
503 dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4);
504 dev->id.hversion_rev = iodc_data[1] & 0x0f;
505 dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) |
506 (iodc_data[5] << 8) | iodc_data[6];
507 dev->hpa.name = parisc_pathname(dev);
508 dev->hpa.start = hpa;
509 /* This is awkward. The STI spec says that gfx devices may occupy
510 * 32MB or 64MB. Unfortunately, we don't know how to tell whether
511 * it's the former or the latter. Assumptions either way can hurt us.
512 */
513 if (hpa == 0xf4000000 || hpa == 0xf8000000) {
514 dev->hpa.end = hpa + 0x03ffffff;
515 } else if (hpa == 0xf6000000 || hpa == 0xfa000000) {
516 dev->hpa.end = hpa + 0x01ffffff;
517 } else {
518 dev->hpa.end = hpa + 0xfff;
519 }
520 dev->hpa.flags = IORESOURCE_MEM;
521 name = parisc_hardware_description(&dev->id);
522 if (name) {
523 strlcpy(dev->name, name, sizeof(dev->name));
524 }
525
526 /* Silently fail things like mouse ports which are subsumed within
527 * the keyboard controller
528 */
529 if ((hpa & 0xfff) == 0 && insert_resource(&iomem_resource, &dev->hpa))
530 printk("Unable to claim HPA %lx for device %s\n",
531 hpa, name);
532
533 return dev;
534}
535
536static int parisc_generic_match(struct device *dev, struct device_driver *drv)
537{
538 return match_device(to_parisc_driver(drv), to_parisc_device(dev));
539}
540
541static ssize_t make_modalias(struct device *dev, char *buf)
542{
543 const struct parisc_device *padev = to_parisc_device(dev);
544 const struct parisc_device_id *id = &padev->id;
545
546 return sprintf(buf, "parisc:t%02Xhv%04Xrev%02Xsv%08X\n",
547 (u8)id->hw_type, (u16)id->hversion, (u8)id->hversion_rev,
548 (u32)id->sversion);
549}
550
551static int parisc_uevent(struct device *dev, struct kobj_uevent_env *env)
552{
553 const struct parisc_device *padev;
554 char modalias[40];
555
556 if (!dev)
557 return -ENODEV;
558
559 padev = to_parisc_device(dev);
560 if (!padev)
561 return -ENODEV;
562
563 if (add_uevent_var(env, "PARISC_NAME=%s", padev->name))
564 return -ENOMEM;
565
566 make_modalias(dev, modalias);
567 if (add_uevent_var(env, "MODALIAS=%s", modalias))
568 return -ENOMEM;
569
570 return 0;
571}
572
573#define pa_dev_attr(name, field, format_string) \
574static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf) \
575{ \
576 struct parisc_device *padev = to_parisc_device(dev); \
577 return sprintf(buf, format_string, padev->field); \
578}
579
580#define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format)
581
582pa_dev_attr(irq, irq, "%u\n");
583pa_dev_attr_id(hw_type, "0x%02x\n");
584pa_dev_attr(rev, id.hversion_rev, "0x%x\n");
585pa_dev_attr_id(hversion, "0x%03x\n");
586pa_dev_attr_id(sversion, "0x%05x\n");
587
588static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
589{
590 return make_modalias(dev, buf);
591}
592
593static struct device_attribute parisc_device_attrs[] = {
594 __ATTR_RO(irq),
595 __ATTR_RO(hw_type),
596 __ATTR_RO(rev),
597 __ATTR_RO(hversion),
598 __ATTR_RO(sversion),
599 __ATTR_RO(modalias),
600 __ATTR_NULL,
601};
602
603struct bus_type parisc_bus_type = {
604 .name = "parisc",
605 .match = parisc_generic_match,
606 .uevent = parisc_uevent,
607 .dev_attrs = parisc_device_attrs,
608 .probe = parisc_driver_probe,
609 .remove = parisc_driver_remove,
610};
611
612/**
613 * register_parisc_device - Locate a driver to manage this device.
614 * @dev: The parisc device.
615 *
616 * Search the driver list for a driver that is willing to manage
617 * this device.
618 */
619int register_parisc_device(struct parisc_device *dev)
620{
621 if (!dev)
622 return 0;
623
624 if (dev->driver)
625 return 1;
626
627 return 0;
628}
629
630/**
631 * match_pci_device - Matches a pci device against a given hardware path
632 * entry.
633 * @dev: the generic device (known to be contained by a pci_dev).
634 * @index: the current BC index
635 * @modpath: the hardware path.
636 * @return: true if the device matches the hardware path.
637 */
638static int match_pci_device(struct device *dev, int index,
639 struct hardware_path *modpath)
640{
641 struct pci_dev *pdev = to_pci_dev(dev);
642 int id;
643
644 if (index == 5) {
645 /* we are at the end of the path, and on the actual device */
646 unsigned int devfn = pdev->devfn;
647 return ((modpath->bc[5] == PCI_SLOT(devfn)) &&
648 (modpath->mod == PCI_FUNC(devfn)));
649 }
650
651 id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5);
652 return (modpath->bc[index] == id);
653}
654
655/**
656 * match_parisc_device - Matches a parisc device against a given hardware
657 * path entry.
658 * @dev: the generic device (known to be contained by a parisc_device).
659 * @index: the current BC index
660 * @modpath: the hardware path.
661 * @return: true if the device matches the hardware path.
662 */
663static int match_parisc_device(struct device *dev, int index,
664 struct hardware_path *modpath)
665{
666 struct parisc_device *curr = to_parisc_device(dev);
667 char id = (index == 6) ? modpath->mod : modpath->bc[index];
668
669 return (curr->hw_path == id);
670}
671
672struct parse_tree_data {
673 int index;
674 struct hardware_path * modpath;
675 struct device * dev;
676};
677
678static int check_parent(struct device * dev, void * data)
679{
680 struct parse_tree_data * d = data;
681
682 if (check_dev(dev)) {
683 if (dev->bus == &parisc_bus_type) {
684 if (match_parisc_device(dev, d->index, d->modpath))
685 d->dev = dev;
686 } else if (dev_is_pci(dev)) {
687 if (match_pci_device(dev, d->index, d->modpath))
688 d->dev = dev;
689 } else if (dev->bus == NULL) {
690 /* we are on a bus bridge */
691 struct device *new = parse_tree_node(dev, d->index, d->modpath);
692 if (new)
693 d->dev = new;
694 }
695 }
696 return d->dev != NULL;
697}
698
699/**
700 * parse_tree_node - returns a device entry in the iotree
701 * @parent: the parent node in the tree
702 * @index: the current BC index
703 * @modpath: the hardware_path struct to match a device against
704 * @return: The corresponding device if found, NULL otherwise.
705 *
706 * Checks all the children of @parent for a matching @id. If none
707 * found, it returns NULL.
708 */
709static struct device *
710parse_tree_node(struct device *parent, int index, struct hardware_path *modpath)
711{
712 struct parse_tree_data d = {
713 .index = index,
714 .modpath = modpath,
715 };
716
717 struct recurse_struct recurse_data = {
718 .obj = &d,
719 .fn = check_parent,
720 };
721
722 if (device_for_each_child(parent, &recurse_data, descend_children))
723 /* nothing */;
724
725 return d.dev;
726}
727
728/**
729 * hwpath_to_device - Finds the generic device corresponding to a given hardware path.
730 * @modpath: the hardware path.
731 * @return: The target device, NULL if not found.
732 */
733struct device *hwpath_to_device(struct hardware_path *modpath)
734{
735 int i;
736 struct device *parent = &root;
737 for (i = 0; i < 6; i++) {
738 if (modpath->bc[i] == -1)
739 continue;
740 parent = parse_tree_node(parent, i, modpath);
741 if (!parent)
742 return NULL;
743 }
744 if (dev_is_pci(parent)) /* pci devices already parse MOD */
745 return parent;
746 else
747 return parse_tree_node(parent, 6, modpath);
748}
749EXPORT_SYMBOL(hwpath_to_device);
750
751/**
752 * device_to_hwpath - Populates the hwpath corresponding to the given device.
753 * @param dev the target device
754 * @param path pointer to a previously allocated hwpath struct to be filled in
755 */
756void device_to_hwpath(struct device *dev, struct hardware_path *path)
757{
758 struct parisc_device *padev;
759 if (dev->bus == &parisc_bus_type) {
760 padev = to_parisc_device(dev);
761 get_node_path(dev->parent, path);
762 path->mod = padev->hw_path;
763 } else if (dev_is_pci(dev)) {
764 get_node_path(dev, path);
765 }
766}
767EXPORT_SYMBOL(device_to_hwpath);
768
769#define BC_PORT_MASK 0x8
770#define BC_LOWER_PORT 0x8
771
772#define BUS_CONVERTER(dev) \
773 ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT))
774
775#define IS_LOWER_PORT(dev) \
776 ((gsc_readl(dev->hpa.start + offsetof(struct bc_module, io_status)) \
777 & BC_PORT_MASK) == BC_LOWER_PORT)
778
779#define MAX_NATIVE_DEVICES 64
780#define NATIVE_DEVICE_OFFSET 0x1000
781
782#define FLEX_MASK F_EXTEND(0xfffc0000)
783#define IO_IO_LOW offsetof(struct bc_module, io_io_low)
784#define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
785#define READ_IO_IO_LOW(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_LOW)
786#define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_HIGH)
787
788static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
789 struct device *parent);
790
791void walk_lower_bus(struct parisc_device *dev)
792{
793 unsigned long io_io_low, io_io_high;
794
795 if (!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev))
796 return;
797
798 if (dev->id.hw_type == HPHW_IOA) {
799 io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16);
800 io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET;
801 } else {
802 io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK;
803 io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK;
804 }
805
806 walk_native_bus(io_io_low, io_io_high, &dev->dev);
807}
808
809/**
810 * walk_native_bus -- Probe a bus for devices
811 * @io_io_low: Base address of this bus.
812 * @io_io_high: Last address of this bus.
813 * @parent: The parent bus device.
814 *
815 * A native bus (eg Runway or GSC) may have up to 64 devices on it,
816 * spaced at intervals of 0x1000 bytes. PDC may not inform us of these
817 * devices, so we have to probe for them. Unfortunately, we may find
818 * devices which are not physically connected (such as extra serial &
819 * keyboard ports). This problem is not yet solved.
820 */
821static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
822 struct device *parent)
823{
824 int i, devices_found = 0;
825 unsigned long hpa = io_io_low;
826 struct hardware_path path;
827
828 get_node_path(parent, &path);
829 do {
830 for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += NATIVE_DEVICE_OFFSET) {
831 struct parisc_device *dev;
832
833 /* Was the device already added by Firmware? */
834 dev = find_device_by_addr(hpa);
835 if (!dev) {
836 path.mod = i;
837 dev = alloc_pa_dev(hpa, &path);
838 if (!dev)
839 continue;
840
841 register_parisc_device(dev);
842 devices_found++;
843 }
844 walk_lower_bus(dev);
845 }
846 } while(!devices_found && hpa < io_io_high);
847}
848
849#define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000)
850
851/**
852 * walk_central_bus - Find devices attached to the central bus
853 *
854 * PDC doesn't tell us about all devices in the system. This routine
855 * finds devices connected to the central bus.
856 */
857void walk_central_bus(void)
858{
859 walk_native_bus(CENTRAL_BUS_ADDR,
860 CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET),
861 &root);
862}
863
864static void print_parisc_device(struct parisc_device *dev)
865{
866 char hw_path[64];
867 static int count;
868
869 print_pa_hwpath(dev, hw_path);
870 printk(KERN_INFO "%d. %s at 0x%p [%s] { %d, 0x%x, 0x%.3x, 0x%.5x }",
871 ++count, dev->name, (void*) dev->hpa.start, hw_path, dev->id.hw_type,
872 dev->id.hversion_rev, dev->id.hversion, dev->id.sversion);
873
874 if (dev->num_addrs) {
875 int k;
876 printk(", additional addresses: ");
877 for (k = 0; k < dev->num_addrs; k++)
878 printk("0x%lx ", dev->addr[k]);
879 }
880 printk("\n");
881}
882
883/**
884 * init_parisc_bus - Some preparation to be done before inventory
885 */
886void init_parisc_bus(void)
887{
888 if (bus_register(&parisc_bus_type))
889 panic("Could not register PA-RISC bus type\n");
890 if (device_register(&root))
891 panic("Could not register PA-RISC root device\n");
892 get_device(&root);
893}
894
895
896static int print_one_device(struct device * dev, void * data)
897{
898 struct parisc_device * pdev = to_parisc_device(dev);
899
900 if (check_dev(dev))
901 print_parisc_device(pdev);
902 return 0;
903}
904
905/**
906 * print_parisc_devices - Print out a list of devices found in this system
907 */
908void print_parisc_devices(void)
909{
910 for_each_padev(print_one_device, NULL);
911}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers.c
4 *
5 * Copyright (c) 1999 The Puffin Group
6 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
7 * Copyright (c) 2001 Helge Deller <deller@gmx.de>
8 * Copyright (c) 2001,2002 Ryan Bradetich
9 * Copyright (c) 2004-2005 Thibaut VARENE <varenet@parisc-linux.org>
10 *
11 * The file handles registering devices and drivers, then matching them.
12 * It's the closest we get to a dating agency.
13 *
14 * If you're thinking about modifying this file, here are some gotchas to
15 * bear in mind:
16 * - 715/Mirage device paths have a dummy device between Lasi and its children
17 * - The EISA adapter may show up as a sibling or child of Wax
18 * - Dino has an optionally functional serial port. If firmware enables it,
19 * it shows up as a child of Dino. If firmware disables it, the buswalk
20 * finds it and it shows up as a child of Cujo
21 * - Dino has both parisc and pci devices as children
22 * - parisc devices are discovered in a random order, including children
23 * before parents in some cases.
24 */
25
26#include <linux/slab.h>
27#include <linux/types.h>
28#include <linux/kernel.h>
29#include <linux/pci.h>
30#include <linux/spinlock.h>
31#include <linux/string.h>
32#include <linux/export.h>
33#include <linux/dma-map-ops.h>
34#include <asm/hardware.h>
35#include <asm/io.h>
36#include <asm/pdc.h>
37#include <asm/parisc-device.h>
38#include <asm/ropes.h>
39
40/* See comments in include/asm-parisc/pci.h */
41const struct dma_map_ops *hppa_dma_ops __ro_after_init;
42EXPORT_SYMBOL(hppa_dma_ops);
43
44static struct device root = {
45 .init_name = "parisc",
46};
47
48static inline int check_dev(struct device *dev)
49{
50 if (dev->bus == &parisc_bus_type) {
51 struct parisc_device *pdev;
52 pdev = to_parisc_device(dev);
53 return pdev->id.hw_type != HPHW_FAULTY;
54 }
55 return 1;
56}
57
58static struct device *
59parse_tree_node(struct device *parent, int index, struct hardware_path *modpath);
60
61struct recurse_struct {
62 void * obj;
63 int (*fn)(struct device *, void *);
64};
65
66static int descend_children(struct device * dev, void * data)
67{
68 struct recurse_struct * recurse_data = (struct recurse_struct *)data;
69
70 if (recurse_data->fn(dev, recurse_data->obj))
71 return 1;
72 else
73 return device_for_each_child(dev, recurse_data, descend_children);
74}
75
76/**
77 * for_each_padev - Iterate over all devices in the tree
78 * @fn: Function to call for each device.
79 * @data: Data to pass to the called function.
80 *
81 * This performs a depth-first traversal of the tree, calling the
82 * function passed for each node. It calls the function for parents
83 * before children.
84 */
85
86static int for_each_padev(int (*fn)(struct device *, void *), void * data)
87{
88 struct recurse_struct recurse_data = {
89 .obj = data,
90 .fn = fn,
91 };
92 return device_for_each_child(&root, &recurse_data, descend_children);
93}
94
95/**
96 * match_device - Report whether this driver can handle this device
97 * @driver: the PA-RISC driver to try
98 * @dev: the PA-RISC device to try
99 */
100static int match_device(struct parisc_driver *driver, struct parisc_device *dev)
101{
102 const struct parisc_device_id *ids;
103
104 for (ids = driver->id_table; ids->sversion; ids++) {
105 if ((ids->sversion != SVERSION_ANY_ID) &&
106 (ids->sversion != dev->id.sversion))
107 continue;
108
109 if ((ids->hw_type != HWTYPE_ANY_ID) &&
110 (ids->hw_type != dev->id.hw_type))
111 continue;
112
113 if ((ids->hversion != HVERSION_ANY_ID) &&
114 (ids->hversion != dev->id.hversion))
115 continue;
116
117 return 1;
118 }
119 return 0;
120}
121
122static int parisc_driver_probe(struct device *dev)
123{
124 int rc;
125 struct parisc_device *pa_dev = to_parisc_device(dev);
126 struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
127
128 rc = pa_drv->probe(pa_dev);
129
130 if (!rc)
131 pa_dev->driver = pa_drv;
132
133 return rc;
134}
135
136static int __exit parisc_driver_remove(struct device *dev)
137{
138 struct parisc_device *pa_dev = to_parisc_device(dev);
139 struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
140 if (pa_drv->remove)
141 pa_drv->remove(pa_dev);
142
143 return 0;
144}
145
146
147/**
148 * register_parisc_driver - Register this driver if it can handle a device
149 * @driver: the PA-RISC driver to try
150 */
151int register_parisc_driver(struct parisc_driver *driver)
152{
153 /* FIXME: we need this because apparently the sti
154 * driver can be registered twice */
155 if (driver->drv.name) {
156 pr_warn("BUG: skipping previously registered driver %s\n",
157 driver->name);
158 return 1;
159 }
160
161 if (!driver->probe) {
162 pr_warn("BUG: driver %s has no probe routine\n", driver->name);
163 return 1;
164 }
165
166 driver->drv.bus = &parisc_bus_type;
167
168 /* We install our own probe and remove routines */
169 WARN_ON(driver->drv.probe != NULL);
170 WARN_ON(driver->drv.remove != NULL);
171
172 driver->drv.name = driver->name;
173
174 return driver_register(&driver->drv);
175}
176EXPORT_SYMBOL(register_parisc_driver);
177
178
179struct match_count {
180 struct parisc_driver * driver;
181 int count;
182};
183
184static int match_and_count(struct device * dev, void * data)
185{
186 struct match_count * m = data;
187 struct parisc_device * pdev = to_parisc_device(dev);
188
189 if (check_dev(dev)) {
190 if (match_device(m->driver, pdev))
191 m->count++;
192 }
193 return 0;
194}
195
196/**
197 * count_parisc_driver - count # of devices this driver would match
198 * @driver: the PA-RISC driver to try
199 *
200 * Use by IOMMU support to "guess" the right size IOPdir.
201 * Formula is something like memsize/(num_iommu * entry_size).
202 */
203int __init count_parisc_driver(struct parisc_driver *driver)
204{
205 struct match_count m = {
206 .driver = driver,
207 .count = 0,
208 };
209
210 for_each_padev(match_and_count, &m);
211
212 return m.count;
213}
214
215
216
217/**
218 * unregister_parisc_driver - Unregister this driver from the list of drivers
219 * @driver: the PA-RISC driver to unregister
220 */
221int unregister_parisc_driver(struct parisc_driver *driver)
222{
223 driver_unregister(&driver->drv);
224 return 0;
225}
226EXPORT_SYMBOL(unregister_parisc_driver);
227
228struct find_data {
229 unsigned long hpa;
230 struct parisc_device * dev;
231};
232
233static int find_device(struct device * dev, void * data)
234{
235 struct parisc_device * pdev = to_parisc_device(dev);
236 struct find_data * d = (struct find_data*)data;
237
238 if (check_dev(dev)) {
239 if (pdev->hpa.start == d->hpa) {
240 d->dev = pdev;
241 return 1;
242 }
243 }
244 return 0;
245}
246
247static struct parisc_device *find_device_by_addr(unsigned long hpa)
248{
249 struct find_data d = {
250 .hpa = hpa,
251 };
252 int ret;
253
254 ret = for_each_padev(find_device, &d);
255 return ret ? d.dev : NULL;
256}
257
258static int __init is_IKE_device(struct device *dev, void *data)
259{
260 struct parisc_device *pdev = to_parisc_device(dev);
261
262 if (!check_dev(dev))
263 return 0;
264 if (pdev->id.hw_type != HPHW_BCPORT)
265 return 0;
266 if (IS_IKE(pdev) ||
267 (pdev->id.hversion == REO_MERCED_PORT) ||
268 (pdev->id.hversion == REOG_MERCED_PORT)) {
269 return 1;
270 }
271 return 0;
272}
273
274int __init machine_has_merced_bus(void)
275{
276 int ret;
277
278 ret = for_each_padev(is_IKE_device, NULL);
279 return ret ? 1 : 0;
280}
281
282/**
283 * find_pa_parent_type - Find a parent of a specific type
284 * @dev: The device to start searching from
285 * @type: The device type to search for.
286 *
287 * Walks up the device tree looking for a device of the specified type.
288 * If it finds it, it returns it. If not, it returns NULL.
289 */
290const struct parisc_device *
291find_pa_parent_type(const struct parisc_device *padev, int type)
292{
293 const struct device *dev = &padev->dev;
294 while (dev != &root) {
295 struct parisc_device *candidate = to_parisc_device(dev);
296 if (candidate->id.hw_type == type)
297 return candidate;
298 dev = dev->parent;
299 }
300
301 return NULL;
302}
303
304/*
305 * get_node_path fills in @path with the firmware path to the device.
306 * Note that if @node is a parisc device, we don't fill in the 'mod' field.
307 * This is because both callers pass the parent and fill in the mod
308 * themselves. If @node is a PCI device, we do fill it in, even though this
309 * is inconsistent.
310 */
311static void get_node_path(struct device *dev, struct hardware_path *path)
312{
313 int i = 5;
314 memset(&path->bc, -1, 6);
315
316 if (dev_is_pci(dev)) {
317 unsigned int devfn = to_pci_dev(dev)->devfn;
318 path->mod = PCI_FUNC(devfn);
319 path->bc[i--] = PCI_SLOT(devfn);
320 dev = dev->parent;
321 }
322
323 while (dev != &root) {
324 if (dev_is_pci(dev)) {
325 unsigned int devfn = to_pci_dev(dev)->devfn;
326 path->bc[i--] = PCI_SLOT(devfn) | (PCI_FUNC(devfn)<< 5);
327 } else if (dev->bus == &parisc_bus_type) {
328 path->bc[i--] = to_parisc_device(dev)->hw_path;
329 }
330 dev = dev->parent;
331 }
332}
333
334static char *print_hwpath(struct hardware_path *path, char *output)
335{
336 int i;
337 for (i = 0; i < 6; i++) {
338 if (path->bc[i] == -1)
339 continue;
340 output += sprintf(output, "%u/", (unsigned char) path->bc[i]);
341 }
342 output += sprintf(output, "%u", (unsigned char) path->mod);
343 return output;
344}
345
346/**
347 * print_pa_hwpath - Returns hardware path for PA devices
348 * dev: The device to return the path for
349 * output: Pointer to a previously-allocated array to place the path in.
350 *
351 * This function fills in the output array with a human-readable path
352 * to a PA device. This string is compatible with that used by PDC, and
353 * may be printed on the outside of the box.
354 */
355char *print_pa_hwpath(struct parisc_device *dev, char *output)
356{
357 struct hardware_path path;
358
359 get_node_path(dev->dev.parent, &path);
360 path.mod = dev->hw_path;
361 return print_hwpath(&path, output);
362}
363EXPORT_SYMBOL(print_pa_hwpath);
364
365#if defined(CONFIG_PCI) || defined(CONFIG_ISA)
366/**
367 * get_pci_node_path - Determines the hardware path for a PCI device
368 * @pdev: The device to return the path for
369 * @path: Pointer to a previously-allocated array to place the path in.
370 *
371 * This function fills in the hardware_path structure with the route to
372 * the specified PCI device. This structure is suitable for passing to
373 * PDC calls.
374 */
375void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path)
376{
377 get_node_path(&pdev->dev, path);
378}
379EXPORT_SYMBOL(get_pci_node_path);
380
381/**
382 * print_pci_hwpath - Returns hardware path for PCI devices
383 * dev: The device to return the path for
384 * output: Pointer to a previously-allocated array to place the path in.
385 *
386 * This function fills in the output array with a human-readable path
387 * to a PCI device. This string is compatible with that used by PDC, and
388 * may be printed on the outside of the box.
389 */
390char *print_pci_hwpath(struct pci_dev *dev, char *output)
391{
392 struct hardware_path path;
393
394 get_pci_node_path(dev, &path);
395 return print_hwpath(&path, output);
396}
397EXPORT_SYMBOL(print_pci_hwpath);
398
399#endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */
400
401static void setup_bus_id(struct parisc_device *padev)
402{
403 struct hardware_path path;
404 char name[28];
405 char *output = name;
406 int i;
407
408 get_node_path(padev->dev.parent, &path);
409
410 for (i = 0; i < 6; i++) {
411 if (path.bc[i] == -1)
412 continue;
413 output += sprintf(output, "%u:", (unsigned char) path.bc[i]);
414 }
415 sprintf(output, "%u", (unsigned char) padev->hw_path);
416 dev_set_name(&padev->dev, name);
417}
418
419struct parisc_device * __init create_tree_node(char id, struct device *parent)
420{
421 struct parisc_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
422 if (!dev)
423 return NULL;
424
425 dev->hw_path = id;
426 dev->id.hw_type = HPHW_FAULTY;
427
428 dev->dev.parent = parent;
429 setup_bus_id(dev);
430
431 dev->dev.bus = &parisc_bus_type;
432 dev->dma_mask = 0xffffffffUL; /* PARISC devices are 32-bit */
433
434 /* make the generic dma mask a pointer to the parisc one */
435 dev->dev.dma_mask = &dev->dma_mask;
436 dev->dev.coherent_dma_mask = dev->dma_mask;
437 if (device_register(&dev->dev)) {
438 kfree(dev);
439 return NULL;
440 }
441
442 return dev;
443}
444
445struct match_id_data {
446 char id;
447 struct parisc_device * dev;
448};
449
450static int match_by_id(struct device * dev, void * data)
451{
452 struct parisc_device * pdev = to_parisc_device(dev);
453 struct match_id_data * d = data;
454
455 if (pdev->hw_path == d->id) {
456 d->dev = pdev;
457 return 1;
458 }
459 return 0;
460}
461
462/**
463 * alloc_tree_node - returns a device entry in the iotree
464 * @parent: the parent node in the tree
465 * @id: the element of the module path for this entry
466 *
467 * Checks all the children of @parent for a matching @id. If none
468 * found, it allocates a new device and returns it.
469 */
470static struct parisc_device * __init alloc_tree_node(
471 struct device *parent, char id)
472{
473 struct match_id_data d = {
474 .id = id,
475 };
476 if (device_for_each_child(parent, &d, match_by_id))
477 return d.dev;
478 else
479 return create_tree_node(id, parent);
480}
481
482static struct parisc_device *create_parisc_device(struct hardware_path *modpath)
483{
484 int i;
485 struct device *parent = &root;
486 for (i = 0; i < 6; i++) {
487 if (modpath->bc[i] == -1)
488 continue;
489 parent = &alloc_tree_node(parent, modpath->bc[i])->dev;
490 }
491 return alloc_tree_node(parent, modpath->mod);
492}
493
494struct parisc_device * __init
495alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path)
496{
497 int status;
498 unsigned long bytecnt;
499 u8 iodc_data[32];
500 struct parisc_device *dev;
501 const char *name;
502
503 /* Check to make sure this device has not already been added - Ryan */
504 if (find_device_by_addr(hpa) != NULL)
505 return NULL;
506
507 status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32);
508 if (status != PDC_OK)
509 return NULL;
510
511 dev = create_parisc_device(mod_path);
512 if (dev->id.hw_type != HPHW_FAULTY) {
513 pr_err("Two devices have hardware path [%s]. IODC data for second device: %7phN\n"
514 "Rearranging GSC cards sometimes helps\n",
515 parisc_pathname(dev), iodc_data);
516 return NULL;
517 }
518
519 dev->id.hw_type = iodc_data[3] & 0x1f;
520 dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4);
521 dev->id.hversion_rev = iodc_data[1] & 0x0f;
522 dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) |
523 (iodc_data[5] << 8) | iodc_data[6];
524 dev->hpa.name = parisc_pathname(dev);
525 dev->hpa.start = hpa;
526 /* This is awkward. The STI spec says that gfx devices may occupy
527 * 32MB or 64MB. Unfortunately, we don't know how to tell whether
528 * it's the former or the latter. Assumptions either way can hurt us.
529 */
530 if (hpa == 0xf4000000 || hpa == 0xf8000000) {
531 dev->hpa.end = hpa + 0x03ffffff;
532 } else if (hpa == 0xf6000000 || hpa == 0xfa000000) {
533 dev->hpa.end = hpa + 0x01ffffff;
534 } else {
535 dev->hpa.end = hpa + 0xfff;
536 }
537 dev->hpa.flags = IORESOURCE_MEM;
538 name = parisc_hardware_description(&dev->id);
539 if (name) {
540 strlcpy(dev->name, name, sizeof(dev->name));
541 }
542
543 /* Silently fail things like mouse ports which are subsumed within
544 * the keyboard controller
545 */
546 if ((hpa & 0xfff) == 0 && insert_resource(&iomem_resource, &dev->hpa))
547 pr_warn("Unable to claim HPA %lx for device %s\n", hpa, name);
548
549 return dev;
550}
551
552static int parisc_generic_match(struct device *dev, struct device_driver *drv)
553{
554 return match_device(to_parisc_driver(drv), to_parisc_device(dev));
555}
556
557static ssize_t make_modalias(struct device *dev, char *buf)
558{
559 const struct parisc_device *padev = to_parisc_device(dev);
560 const struct parisc_device_id *id = &padev->id;
561
562 return sprintf(buf, "parisc:t%02Xhv%04Xrev%02Xsv%08X\n",
563 (u8)id->hw_type, (u16)id->hversion, (u8)id->hversion_rev,
564 (u32)id->sversion);
565}
566
567static int parisc_uevent(struct device *dev, struct kobj_uevent_env *env)
568{
569 const struct parisc_device *padev;
570 char modalias[40];
571
572 if (!dev)
573 return -ENODEV;
574
575 padev = to_parisc_device(dev);
576 if (!padev)
577 return -ENODEV;
578
579 if (add_uevent_var(env, "PARISC_NAME=%s", padev->name))
580 return -ENOMEM;
581
582 make_modalias(dev, modalias);
583 if (add_uevent_var(env, "MODALIAS=%s", modalias))
584 return -ENOMEM;
585
586 return 0;
587}
588
589#define pa_dev_attr(name, field, format_string) \
590static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf) \
591{ \
592 struct parisc_device *padev = to_parisc_device(dev); \
593 return sprintf(buf, format_string, padev->field); \
594} \
595static DEVICE_ATTR_RO(name);
596
597#define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format)
598
599pa_dev_attr(irq, irq, "%u\n");
600pa_dev_attr_id(hw_type, "0x%02x\n");
601pa_dev_attr(rev, id.hversion_rev, "0x%x\n");
602pa_dev_attr_id(hversion, "0x%03x\n");
603pa_dev_attr_id(sversion, "0x%05x\n");
604
605static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
606{
607 return make_modalias(dev, buf);
608}
609static DEVICE_ATTR_RO(modalias);
610
611static struct attribute *parisc_device_attrs[] = {
612 &dev_attr_irq.attr,
613 &dev_attr_hw_type.attr,
614 &dev_attr_rev.attr,
615 &dev_attr_hversion.attr,
616 &dev_attr_sversion.attr,
617 &dev_attr_modalias.attr,
618 NULL,
619};
620ATTRIBUTE_GROUPS(parisc_device);
621
622struct bus_type parisc_bus_type = {
623 .name = "parisc",
624 .match = parisc_generic_match,
625 .uevent = parisc_uevent,
626 .dev_groups = parisc_device_groups,
627 .probe = parisc_driver_probe,
628 .remove = __exit_p(parisc_driver_remove),
629};
630
631/**
632 * register_parisc_device - Locate a driver to manage this device.
633 * @dev: The parisc device.
634 *
635 * Search the driver list for a driver that is willing to manage
636 * this device.
637 */
638int __init register_parisc_device(struct parisc_device *dev)
639{
640 if (!dev)
641 return 0;
642
643 if (dev->driver)
644 return 1;
645
646 return 0;
647}
648
649/**
650 * match_pci_device - Matches a pci device against a given hardware path
651 * entry.
652 * @dev: the generic device (known to be contained by a pci_dev).
653 * @index: the current BC index
654 * @modpath: the hardware path.
655 * @return: true if the device matches the hardware path.
656 */
657static int match_pci_device(struct device *dev, int index,
658 struct hardware_path *modpath)
659{
660 struct pci_dev *pdev = to_pci_dev(dev);
661 int id;
662
663 if (index == 5) {
664 /* we are at the end of the path, and on the actual device */
665 unsigned int devfn = pdev->devfn;
666 return ((modpath->bc[5] == PCI_SLOT(devfn)) &&
667 (modpath->mod == PCI_FUNC(devfn)));
668 }
669
670 /* index might be out of bounds for bc[] */
671 if (index >= 6)
672 return 0;
673
674 id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5);
675 return (modpath->bc[index] == id);
676}
677
678/**
679 * match_parisc_device - Matches a parisc device against a given hardware
680 * path entry.
681 * @dev: the generic device (known to be contained by a parisc_device).
682 * @index: the current BC index
683 * @modpath: the hardware path.
684 * @return: true if the device matches the hardware path.
685 */
686static int match_parisc_device(struct device *dev, int index,
687 struct hardware_path *modpath)
688{
689 struct parisc_device *curr = to_parisc_device(dev);
690 char id = (index == 6) ? modpath->mod : modpath->bc[index];
691
692 return (curr->hw_path == id);
693}
694
695struct parse_tree_data {
696 int index;
697 struct hardware_path * modpath;
698 struct device * dev;
699};
700
701static int check_parent(struct device * dev, void * data)
702{
703 struct parse_tree_data * d = data;
704
705 if (check_dev(dev)) {
706 if (dev->bus == &parisc_bus_type) {
707 if (match_parisc_device(dev, d->index, d->modpath))
708 d->dev = dev;
709 } else if (dev_is_pci(dev)) {
710 if (match_pci_device(dev, d->index, d->modpath))
711 d->dev = dev;
712 } else if (dev->bus == NULL) {
713 /* we are on a bus bridge */
714 struct device *new = parse_tree_node(dev, d->index, d->modpath);
715 if (new)
716 d->dev = new;
717 }
718 }
719 return d->dev != NULL;
720}
721
722/**
723 * parse_tree_node - returns a device entry in the iotree
724 * @parent: the parent node in the tree
725 * @index: the current BC index
726 * @modpath: the hardware_path struct to match a device against
727 * @return: The corresponding device if found, NULL otherwise.
728 *
729 * Checks all the children of @parent for a matching @id. If none
730 * found, it returns NULL.
731 */
732static struct device *
733parse_tree_node(struct device *parent, int index, struct hardware_path *modpath)
734{
735 struct parse_tree_data d = {
736 .index = index,
737 .modpath = modpath,
738 };
739
740 struct recurse_struct recurse_data = {
741 .obj = &d,
742 .fn = check_parent,
743 };
744
745 if (device_for_each_child(parent, &recurse_data, descend_children))
746 /* nothing */;
747
748 return d.dev;
749}
750
751/**
752 * hwpath_to_device - Finds the generic device corresponding to a given hardware path.
753 * @modpath: the hardware path.
754 * @return: The target device, NULL if not found.
755 */
756struct device *hwpath_to_device(struct hardware_path *modpath)
757{
758 int i;
759 struct device *parent = &root;
760 for (i = 0; i < 6; i++) {
761 if (modpath->bc[i] == -1)
762 continue;
763 parent = parse_tree_node(parent, i, modpath);
764 if (!parent)
765 return NULL;
766 }
767 if (dev_is_pci(parent)) /* pci devices already parse MOD */
768 return parent;
769 else
770 return parse_tree_node(parent, 6, modpath);
771}
772EXPORT_SYMBOL(hwpath_to_device);
773
774/**
775 * device_to_hwpath - Populates the hwpath corresponding to the given device.
776 * @param dev the target device
777 * @param path pointer to a previously allocated hwpath struct to be filled in
778 */
779void device_to_hwpath(struct device *dev, struct hardware_path *path)
780{
781 struct parisc_device *padev;
782 if (dev->bus == &parisc_bus_type) {
783 padev = to_parisc_device(dev);
784 get_node_path(dev->parent, path);
785 path->mod = padev->hw_path;
786 } else if (dev_is_pci(dev)) {
787 get_node_path(dev, path);
788 }
789}
790EXPORT_SYMBOL(device_to_hwpath);
791
792#define BC_PORT_MASK 0x8
793#define BC_LOWER_PORT 0x8
794
795#define BUS_CONVERTER(dev) \
796 ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT))
797
798#define IS_LOWER_PORT(dev) \
799 ((gsc_readl(dev->hpa.start + offsetof(struct bc_module, io_status)) \
800 & BC_PORT_MASK) == BC_LOWER_PORT)
801
802#define MAX_NATIVE_DEVICES 64
803#define NATIVE_DEVICE_OFFSET 0x1000
804
805#define FLEX_MASK F_EXTEND(0xfffc0000)
806#define IO_IO_LOW offsetof(struct bc_module, io_io_low)
807#define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
808#define READ_IO_IO_LOW(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_LOW)
809#define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_HIGH)
810
811static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
812 struct device *parent);
813
814static void __init walk_lower_bus(struct parisc_device *dev)
815{
816 unsigned long io_io_low, io_io_high;
817
818 if (!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev))
819 return;
820
821 if (dev->id.hw_type == HPHW_IOA) {
822 io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16);
823 io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET;
824 } else {
825 io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK;
826 io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK;
827 }
828
829 walk_native_bus(io_io_low, io_io_high, &dev->dev);
830}
831
832/**
833 * walk_native_bus -- Probe a bus for devices
834 * @io_io_low: Base address of this bus.
835 * @io_io_high: Last address of this bus.
836 * @parent: The parent bus device.
837 *
838 * A native bus (eg Runway or GSC) may have up to 64 devices on it,
839 * spaced at intervals of 0x1000 bytes. PDC may not inform us of these
840 * devices, so we have to probe for them. Unfortunately, we may find
841 * devices which are not physically connected (such as extra serial &
842 * keyboard ports). This problem is not yet solved.
843 */
844static void __init walk_native_bus(unsigned long io_io_low,
845 unsigned long io_io_high, struct device *parent)
846{
847 int i, devices_found = 0;
848 unsigned long hpa = io_io_low;
849 struct hardware_path path;
850
851 get_node_path(parent, &path);
852 do {
853 for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += NATIVE_DEVICE_OFFSET) {
854 struct parisc_device *dev;
855
856 /* Was the device already added by Firmware? */
857 dev = find_device_by_addr(hpa);
858 if (!dev) {
859 path.mod = i;
860 dev = alloc_pa_dev(hpa, &path);
861 if (!dev)
862 continue;
863
864 register_parisc_device(dev);
865 devices_found++;
866 }
867 walk_lower_bus(dev);
868 }
869 } while(!devices_found && hpa < io_io_high);
870}
871
872#define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000)
873
874/**
875 * walk_central_bus - Find devices attached to the central bus
876 *
877 * PDC doesn't tell us about all devices in the system. This routine
878 * finds devices connected to the central bus.
879 */
880void __init walk_central_bus(void)
881{
882 walk_native_bus(CENTRAL_BUS_ADDR,
883 CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET),
884 &root);
885}
886
887static void print_parisc_device(struct parisc_device *dev)
888{
889 char hw_path[64];
890 static int count;
891
892 print_pa_hwpath(dev, hw_path);
893 pr_info("%d. %s at %pap [%s] { %d, 0x%x, 0x%.3x, 0x%.5x }",
894 ++count, dev->name, &(dev->hpa.start), hw_path, dev->id.hw_type,
895 dev->id.hversion_rev, dev->id.hversion, dev->id.sversion);
896
897 if (dev->num_addrs) {
898 int k;
899 pr_cont(", additional addresses: ");
900 for (k = 0; k < dev->num_addrs; k++)
901 pr_cont("0x%lx ", dev->addr[k]);
902 }
903 pr_cont("\n");
904}
905
906/**
907 * init_parisc_bus - Some preparation to be done before inventory
908 */
909void __init init_parisc_bus(void)
910{
911 if (bus_register(&parisc_bus_type))
912 panic("Could not register PA-RISC bus type\n");
913 if (device_register(&root))
914 panic("Could not register PA-RISC root device\n");
915 get_device(&root);
916}
917
918static __init void qemu_header(void)
919{
920 int num;
921 unsigned long *p;
922
923 pr_info("--- cut here ---\n");
924 pr_info("/* AUTO-GENERATED HEADER FILE FOR SEABIOS FIRMWARE */\n");
925 pr_cont("/* generated with Linux kernel */\n");
926 pr_cont("/* search for PARISC_QEMU_MACHINE_HEADER in Linux */\n\n");
927
928 pr_info("#define PARISC_MODEL \"%s\"\n\n",
929 boot_cpu_data.pdc.sys_model_name);
930
931 pr_info("#define PARISC_PDC_MODEL 0x%lx, 0x%lx, 0x%lx, "
932 "0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx\n\n",
933 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
934 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
935 #undef p
936
937 pr_info("#define PARISC_PDC_VERSION 0x%04lx\n\n",
938 boot_cpu_data.pdc.versions);
939
940 pr_info("#define PARISC_PDC_CPUID 0x%04lx\n\n",
941 boot_cpu_data.pdc.cpuid);
942
943 pr_info("#define PARISC_PDC_CAPABILITIES 0x%04lx\n\n",
944 boot_cpu_data.pdc.capabilities);
945
946 pr_info("#define PARISC_PDC_ENTRY_ORG 0x%04lx\n\n",
947#ifdef CONFIG_64BIT
948 (unsigned long)(PAGE0->mem_pdc_hi) << 32 |
949#endif
950 (unsigned long)PAGE0->mem_pdc);
951
952 pr_info("#define PARISC_PDC_CACHE_INFO");
953 p = (unsigned long *) &cache_info;
954 for (num = 0; num < sizeof(cache_info); num += sizeof(unsigned long)) {
955 if (((num % 5) == 0)) {
956 pr_cont(" \\\n");
957 pr_info("\t");
958 }
959 pr_cont("%s0x%04lx",
960 num?", ":"", *p++);
961 }
962 pr_cont("\n\n");
963}
964
965static __init int qemu_print_hpa(struct device *lin_dev, void *data)
966{
967 struct parisc_device *dev = to_parisc_device(lin_dev);
968 unsigned long hpa = dev->hpa.start;
969
970 pr_cont("\t{\t.hpa = 0x%08lx,\\\n", hpa);
971 pr_cont("\t\t.iodc = &iodc_data_hpa_%08lx,\\\n", hpa);
972 pr_cont("\t\t.mod_info = &mod_info_hpa_%08lx,\\\n", hpa);
973 pr_cont("\t\t.mod_path = &mod_path_hpa_%08lx,\\\n", hpa);
974 pr_cont("\t\t.num_addr = HPA_%08lx_num_addr,\\\n", hpa);
975 pr_cont("\t\t.add_addr = { HPA_%08lx_add_addr } },\\\n", hpa);
976 return 0;
977}
978
979
980static __init void qemu_footer(void)
981{
982 pr_info("\n\n#define PARISC_DEVICE_LIST \\\n");
983 for_each_padev(qemu_print_hpa, NULL);
984 pr_cont("\t{ 0, }\n");
985 pr_info("--- cut here ---\n");
986}
987
988/* print iodc data of the various hpa modules for qemu inclusion */
989static __init int qemu_print_iodc_data(struct device *lin_dev, void *data)
990{
991 struct parisc_device *dev = to_parisc_device(lin_dev);
992 unsigned long count;
993 unsigned long hpa = dev->hpa.start;
994 int status;
995 struct pdc_iodc iodc_data;
996
997 int mod_index;
998 struct pdc_system_map_mod_info pdc_mod_info;
999 struct pdc_module_path mod_path;
1000
1001 status = pdc_iodc_read(&count, hpa, 0,
1002 &iodc_data, sizeof(iodc_data));
1003 if (status != PDC_OK) {
1004 pr_info("No IODC data for hpa 0x%08lx\n", hpa);
1005 return 0;
1006 }
1007
1008 pr_info("\n");
1009
1010 pr_info("#define HPA_%08lx_DESCRIPTION \"%s\"\n",
1011 hpa, parisc_hardware_description(&dev->id));
1012
1013 mod_index = 0;
1014 do {
1015 status = pdc_system_map_find_mods(&pdc_mod_info,
1016 &mod_path, mod_index++);
1017 } while (status == PDC_OK && pdc_mod_info.mod_addr != hpa);
1018
1019 pr_info("static struct pdc_system_map_mod_info"
1020 " mod_info_hpa_%08lx = {\n", hpa);
1021 #define DO(member) \
1022 pr_cont("\t." #member " = 0x%x,\n", \
1023 (unsigned int)pdc_mod_info.member)
1024 DO(mod_addr);
1025 DO(mod_pgs);
1026 DO(add_addrs);
1027 pr_cont("};\n");
1028 #undef DO
1029 pr_info("static struct pdc_module_path "
1030 "mod_path_hpa_%08lx = {\n", hpa);
1031 pr_cont("\t.path = { ");
1032 pr_cont(".flags = 0x%x, ", mod_path.path.flags);
1033 pr_cont(".bc = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }, ",
1034 (unsigned char)mod_path.path.bc[0],
1035 (unsigned char)mod_path.path.bc[1],
1036 (unsigned char)mod_path.path.bc[2],
1037 (unsigned char)mod_path.path.bc[3],
1038 (unsigned char)mod_path.path.bc[4],
1039 (unsigned char)mod_path.path.bc[5]);
1040 pr_cont(".mod = 0x%x ", mod_path.path.mod);
1041 pr_cont(" },\n");
1042 pr_cont("\t.layers = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }\n",
1043 mod_path.layers[0], mod_path.layers[1], mod_path.layers[2],
1044 mod_path.layers[3], mod_path.layers[4], mod_path.layers[5]);
1045 pr_cont("};\n");
1046
1047 pr_info("static struct pdc_iodc iodc_data_hpa_%08lx = {\n", hpa);
1048 #define DO(member) \
1049 pr_cont("\t." #member " = 0x%04lx,\n", \
1050 (unsigned long)iodc_data.member)
1051 DO(hversion_model);
1052 DO(hversion);
1053 DO(spa);
1054 DO(type);
1055 DO(sversion_rev);
1056 DO(sversion_model);
1057 DO(sversion_opt);
1058 DO(rev);
1059 DO(dep);
1060 DO(features);
1061 DO(checksum);
1062 DO(length);
1063 #undef DO
1064 pr_cont("\t/* pad: 0x%04x, 0x%04x */\n",
1065 iodc_data.pad[0], iodc_data.pad[1]);
1066 pr_cont("};\n");
1067
1068 pr_info("#define HPA_%08lx_num_addr %d\n", hpa, dev->num_addrs);
1069 pr_info("#define HPA_%08lx_add_addr ", hpa);
1070 count = 0;
1071 if (dev->num_addrs == 0)
1072 pr_cont("0");
1073 while (count < dev->num_addrs) {
1074 pr_cont("0x%08lx, ", dev->addr[count]);
1075 count++;
1076 }
1077 pr_cont("\n\n");
1078
1079 return 0;
1080}
1081
1082
1083
1084static int print_one_device(struct device * dev, void * data)
1085{
1086 struct parisc_device * pdev = to_parisc_device(dev);
1087
1088 if (check_dev(dev))
1089 print_parisc_device(pdev);
1090 return 0;
1091}
1092
1093/**
1094 * print_parisc_devices - Print out a list of devices found in this system
1095 */
1096void __init print_parisc_devices(void)
1097{
1098 for_each_padev(print_one_device, NULL);
1099 #define PARISC_QEMU_MACHINE_HEADER 0
1100 if (PARISC_QEMU_MACHINE_HEADER) {
1101 qemu_header();
1102 for_each_padev(qemu_print_iodc_data, NULL);
1103 qemu_footer();
1104 }
1105}