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