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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) 2001-2023 Helge Deller <[email protected]>
8 * Copyright (c) 2001,2002 Ryan Bradetich
9 * Copyright (c) 2004-2005 Thibaut VARENE <[email protected]>
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
46static inline int check_dev(struct device *dev)
47{
48 if (dev->bus == &parisc_bus_type) {
49 struct parisc_device *pdev;
50 pdev = to_parisc_device(dev);
51 return pdev->id.hw_type != HPHW_FAULTY;
52 }
53 return 1;
54}
55
56static struct device *
57parse_tree_node(struct device *parent, int index, struct hardware_path *modpath);
58
59struct recurse_struct {
60 void * obj;
61 int (*fn)(struct device *, void *);
62};
63
64static int descend_children(struct device * dev, void * data)
65{
66 struct recurse_struct * recurse_data = (struct recurse_struct *)data;
67
68 if (recurse_data->fn(dev, recurse_data->obj))
69 return 1;
70 else
71 return device_for_each_child(dev, recurse_data, descend_children);
72}
73
74/**
75 * for_each_padev - Iterate over all devices in the tree
76 * @fn: Function to call for each device.
77 * @data: Data to pass to the called function.
78 *
79 * This performs a depth-first traversal of the tree, calling the
80 * function passed for each node. It calls the function for parents
81 * before children.
82 */
83
84static int for_each_padev(int (*fn)(struct device *, void *), void * data)
85{
86 struct recurse_struct recurse_data = {
87 .obj = data,
88 .fn = fn,
89 };
90 return device_for_each_child(root, &recurse_data, descend_children);
91}
92
93/**
94 * match_device - Report whether this driver can handle this device
95 * @driver: the PA-RISC driver to try
96 * @dev: the PA-RISC device to try
97 */
98static int match_device(const struct parisc_driver *driver, struct parisc_device *dev)
99{
100 const struct parisc_device_id *ids;
101
102 for (ids = driver->id_table; ids->sversion; ids++) {
103 if ((ids->sversion != SVERSION_ANY_ID) &&
104 (ids->sversion != dev->id.sversion))
105 continue;
106
107 if ((ids->hw_type != HWTYPE_ANY_ID) &&
108 (ids->hw_type != dev->id.hw_type))
109 continue;
110
111 if ((ids->hversion != HVERSION_ANY_ID) &&
112 (ids->hversion != dev->id.hversion))
113 continue;
114
115 return 1;
116 }
117 return 0;
118}
119
120static int parisc_driver_probe(struct device *dev)
121{
122 int rc;
123 struct parisc_device *pa_dev = to_parisc_device(dev);
124 struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
125
126 rc = pa_drv->probe(pa_dev);
127
128 if (!rc)
129 pa_dev->driver = pa_drv;
130
131 return rc;
132}
133
134static void __exit parisc_driver_remove(struct device *dev)
135{
136 struct parisc_device *pa_dev = to_parisc_device(dev);
137 struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
138
139 if (pa_drv->remove)
140 pa_drv->remove(pa_dev);
141}
142
143
144/**
145 * register_parisc_driver - Register this driver if it can handle a device
146 * @driver: the PA-RISC driver to try
147 */
148int register_parisc_driver(struct parisc_driver *driver)
149{
150 /* FIXME: we need this because apparently the sti
151 * driver can be registered twice */
152 if (driver->drv.name) {
153 pr_warn("BUG: skipping previously registered driver %s\n",
154 driver->name);
155 return 1;
156 }
157
158 if (!driver->probe) {
159 pr_warn("BUG: driver %s has no probe routine\n", driver->name);
160 return 1;
161 }
162
163 driver->drv.bus = &parisc_bus_type;
164
165 /* We install our own probe and remove routines */
166 WARN_ON(driver->drv.probe != NULL);
167 WARN_ON(driver->drv.remove != NULL);
168
169 driver->drv.name = driver->name;
170
171 return driver_register(&driver->drv);
172}
173EXPORT_SYMBOL(register_parisc_driver);
174
175
176struct match_count {
177 struct parisc_driver * driver;
178 int count;
179};
180
181static int match_and_count(struct device * dev, void * data)
182{
183 struct match_count * m = data;
184 struct parisc_device * pdev = to_parisc_device(dev);
185
186 if (check_dev(dev)) {
187 if (match_device(m->driver, pdev))
188 m->count++;
189 }
190 return 0;
191}
192
193/**
194 * count_parisc_driver - count # of devices this driver would match
195 * @driver: the PA-RISC driver to try
196 *
197 * Use by IOMMU support to "guess" the right size IOPdir.
198 * Formula is something like memsize/(num_iommu * entry_size).
199 */
200int __init count_parisc_driver(struct parisc_driver *driver)
201{
202 struct match_count m = {
203 .driver = driver,
204 .count = 0,
205 };
206
207 for_each_padev(match_and_count, &m);
208
209 return m.count;
210}
211
212
213
214/**
215 * unregister_parisc_driver - Unregister this driver from the list of drivers
216 * @driver: the PA-RISC driver to unregister
217 */
218int unregister_parisc_driver(struct parisc_driver *driver)
219{
220 driver_unregister(&driver->drv);
221 return 0;
222}
223EXPORT_SYMBOL(unregister_parisc_driver);
224
225struct find_data {
226 unsigned long hpa;
227 struct parisc_device * dev;
228};
229
230static int find_device(struct device * dev, void * data)
231{
232 struct parisc_device * pdev = to_parisc_device(dev);
233 struct find_data * d = (struct find_data*)data;
234
235 if (check_dev(dev)) {
236 if (pdev->hpa.start == d->hpa) {
237 d->dev = pdev;
238 return 1;
239 }
240 }
241 return 0;
242}
243
244static struct parisc_device *find_device_by_addr(unsigned long hpa)
245{
246 struct find_data d = {
247 .hpa = hpa,
248 };
249 int ret;
250
251 ret = for_each_padev(find_device, &d);
252 return ret ? d.dev : NULL;
253}
254
255static int __init is_IKE_device(struct device *dev, void *data)
256{
257 struct parisc_device *pdev = to_parisc_device(dev);
258
259 if (!check_dev(dev))
260 return 0;
261 if (pdev->id.hw_type != HPHW_BCPORT)
262 return 0;
263 if (IS_IKE(pdev) ||
264 (pdev->id.hversion == REO_MERCED_PORT) ||
265 (pdev->id.hversion == REOG_MERCED_PORT)) {
266 return 1;
267 }
268 return 0;
269}
270
271int __init machine_has_merced_bus(void)
272{
273 int ret;
274
275 ret = for_each_padev(is_IKE_device, NULL);
276 return ret ? 1 : 0;
277}
278
279/**
280 * find_pa_parent_type - Find a parent of a specific type
281 * @padev: The device to start searching from
282 * @type: The device type to search for.
283 *
284 * Walks up the device tree looking for a device of the specified type.
285 * If it finds it, it returns it. If not, it returns NULL.
286 */
287const struct parisc_device *
288find_pa_parent_type(const struct parisc_device *padev, int type)
289{
290 const struct device *dev = &padev->dev;
291 while (dev != root) {
292 struct parisc_device *candidate = to_parisc_device(dev);
293 if (candidate->id.hw_type == type)
294 return candidate;
295 dev = dev->parent;
296 }
297
298 return NULL;
299}
300
301/*
302 * get_node_path fills in @path with the firmware path to the device.
303 * Note that if @node is a parisc device, we don't fill in the 'mod' field.
304 * This is because both callers pass the parent and fill in the mod
305 * themselves. If @node is a PCI device, we do fill it in, even though this
306 * is inconsistent.
307 */
308static void get_node_path(struct device *dev, struct hardware_path *path)
309{
310 int i = 5;
311 memset(&path->bc, -1, 6);
312
313 if (dev_is_pci(dev)) {
314 unsigned int devfn = to_pci_dev(dev)->devfn;
315 path->mod = PCI_FUNC(devfn);
316 path->bc[i--] = PCI_SLOT(devfn);
317 dev = dev->parent;
318 }
319
320 while (dev != root) {
321 if (dev_is_pci(dev)) {
322 unsigned int devfn = to_pci_dev(dev)->devfn;
323 path->bc[i--] = PCI_SLOT(devfn) | (PCI_FUNC(devfn)<< 5);
324 } else if (dev->bus == &parisc_bus_type) {
325 path->bc[i--] = to_parisc_device(dev)->hw_path;
326 }
327 dev = dev->parent;
328 }
329}
330
331static char *print_hwpath(struct hardware_path *path, char *output)
332{
333 int i;
334 for (i = 0; i < 6; i++) {
335 if (path->bc[i] == -1)
336 continue;
337 output += sprintf(output, "%u/", (unsigned char) path->bc[i]);
338 }
339 output += sprintf(output, "%u", (unsigned char) path->mod);
340 return output;
341}
342
343/**
344 * print_pa_hwpath - Returns hardware path for PA devices
345 * @dev: The device to return the path for
346 * @output: Pointer to a previously-allocated array to place the path in.
347 *
348 * This function fills in the output array with a human-readable path
349 * to a PA device. This string is compatible with that used by PDC, and
350 * may be printed on the outside of the box.
351 */
352char *print_pa_hwpath(struct parisc_device *dev, char *output)
353{
354 struct hardware_path path;
355
356 get_node_path(dev->dev.parent, &path);
357 path.mod = dev->hw_path;
358 return print_hwpath(&path, output);
359}
360EXPORT_SYMBOL(print_pa_hwpath);
361
362#if defined(CONFIG_PCI) || defined(CONFIG_ISA)
363/**
364 * get_pci_node_path - Determines the hardware path for a PCI device
365 * @pdev: The device to return the path for
366 * @path: Pointer to a previously-allocated array to place the path in.
367 *
368 * This function fills in the hardware_path structure with the route to
369 * the specified PCI device. This structure is suitable for passing to
370 * PDC calls.
371 */
372void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path)
373{
374 get_node_path(&pdev->dev, path);
375}
376EXPORT_SYMBOL(get_pci_node_path);
377
378/**
379 * print_pci_hwpath - Returns hardware path for PCI devices
380 * @dev: The device to return the path for
381 * @output: Pointer to a previously-allocated array to place the path in.
382 *
383 * This function fills in the output array with a human-readable path
384 * to a PCI device. This string is compatible with that used by PDC, and
385 * may be printed on the outside of the box.
386 */
387char *print_pci_hwpath(struct pci_dev *dev, char *output)
388{
389 struct hardware_path path;
390
391 get_pci_node_path(dev, &path);
392 return print_hwpath(&path, output);
393}
394EXPORT_SYMBOL(print_pci_hwpath);
395
396#endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */
397
398static void setup_bus_id(struct parisc_device *padev)
399{
400 struct hardware_path path;
401 char name[28];
402 char *output = name;
403 int i;
404
405 get_node_path(padev->dev.parent, &path);
406
407 for (i = 0; i < 6; i++) {
408 if (path.bc[i] == -1)
409 continue;
410 output += sprintf(output, "%u:", (unsigned char) path.bc[i]);
411 }
412 sprintf(output, "%u", (unsigned char) padev->hw_path);
413 dev_set_name(&padev->dev, name);
414}
415
416static struct parisc_device * __init create_tree_node(char id,
417 struct device *parent)
418{
419 struct parisc_device *dev = kzalloc_obj(*dev);
420 if (!dev)
421 return NULL;
422
423 dev->hw_path = id;
424 dev->id.hw_type = HPHW_FAULTY;
425
426 dev->dev.parent = parent;
427 setup_bus_id(dev);
428
429 dev->dev.bus = &parisc_bus_type;
430 dev->dma_mask = 0xffffffffUL; /* PARISC devices are 32-bit */
431
432 /* make the generic dma mask a pointer to the parisc one */
433 dev->dev.dma_mask = &dev->dma_mask;
434 dev->dev.coherent_dma_mask = dev->dma_mask;
435 if (device_register(&dev->dev)) {
436 put_device(&dev->dev);
437 return NULL;
438 }
439
440 return dev;
441}
442
443struct match_id_data {
444 char id;
445 struct parisc_device * dev;
446};
447
448static int match_by_id(struct device * dev, void * data)
449{
450 struct parisc_device * pdev = to_parisc_device(dev);
451 struct match_id_data * d = data;
452
453 if (pdev->hw_path == d->id) {
454 d->dev = pdev;
455 return 1;
456 }
457 return 0;
458}
459
460/**
461 * alloc_tree_node - returns a device entry in the iotree
462 * @parent: the parent node in the tree
463 * @id: the element of the module path for this entry
464 *
465 * Checks all the children of @parent for a matching @id. If none
466 * found, it allocates a new device and returns it.
467 */
468static struct parisc_device * __init alloc_tree_node(
469 struct device *parent, char id)
470{
471 struct match_id_data d = {
472 .id = id,
473 };
474 if (device_for_each_child(parent, &d, match_by_id))
475 return d.dev;
476 else
477 return create_tree_node(id, parent);
478}
479
480static struct parisc_device *create_parisc_device(struct hardware_path *modpath)
481{
482 int i;
483 struct device *parent = root;
484 for (i = 0; i < 6; i++) {
485 if (modpath->bc[i] == -1)
486 continue;
487 parent = &alloc_tree_node(parent, modpath->bc[i])->dev;
488 }
489 return alloc_tree_node(parent, modpath->mod);
490}
491
492struct parisc_device * __init
493alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path)
494{
495 int status;
496 unsigned long bytecnt;
497 u8 iodc_data[32];
498 struct parisc_device *dev;
499 const char *name;
500
501 /* Check to make sure this device has not already been added - Ryan */
502 if (find_device_by_addr(hpa) != NULL)
503 return NULL;
504
505 status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32);
506 if (status != PDC_OK)
507 return NULL;
508
509 dev = create_parisc_device(mod_path);
510 if (dev->id.hw_type != HPHW_FAULTY) {
511 pr_err("Two devices have hardware path [%s]. IODC data for second device: %7phN\n"
512 "Rearranging GSC cards sometimes helps\n",
513 parisc_pathname(dev), iodc_data);
514 return NULL;
515 }
516
517 dev->id.hw_type = iodc_data[3] & 0x1f;
518 dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4);
519 dev->id.hversion_rev = iodc_data[1] & 0x0f;
520 dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) |
521 (iodc_data[5] << 8) | iodc_data[6];
522 dev->hpa.start = hpa;
523 /* This is awkward. The STI spec says that gfx devices may occupy
524 * 32MB or 64MB. Unfortunately, we don't know how to tell whether
525 * it's the former or the latter. Assumptions either way can hurt us.
526 */
527 if (hpa == 0xf4000000 || hpa == 0xf8000000) {
528 dev->hpa.end = hpa + 0x03ffffff;
529 } else if (hpa == 0xf6000000 || hpa == 0xfa000000) {
530 dev->hpa.end = hpa + 0x01ffffff;
531 } else {
532 dev->hpa.end = hpa + 0xfff;
533 }
534 dev->hpa.flags = IORESOURCE_MEM;
535 dev->hpa.name = dev->name;
536 name = parisc_hardware_description(&dev->id) ? : "unknown";
537 snprintf(dev->name, sizeof(dev->name), "%s [%s]",
538 name, parisc_pathname(dev));
539
540 /* Silently fail things like mouse ports which are subsumed within
541 * the keyboard controller
542 */
543 if ((hpa & 0xfff) == 0 && insert_resource(&iomem_resource, &dev->hpa))
544 pr_warn("Unable to claim HPA %lx for device %s\n", hpa, name);
545
546 return dev;
547}
548
549static int parisc_generic_match(struct device *dev, const struct device_driver *drv)
550{
551 return match_device(to_parisc_driver(drv), to_parisc_device(dev));
552}
553
554static ssize_t make_modalias(const struct device *dev, char *buf)
555{
556 const struct parisc_device *padev = to_parisc_device(dev);
557 const struct parisc_device_id *id = &padev->id;
558
559 return sprintf(buf, "parisc:t%02Xhv%04Xrev%02Xsv%08X\n",
560 (u8)id->hw_type, (u16)id->hversion, (u8)id->hversion_rev,
561 (u32)id->sversion);
562}
563
564static int parisc_uevent(const struct device *dev, struct kobj_uevent_env *env)
565{
566 const struct parisc_device *padev;
567 char modalias[40];
568
569 if (!dev)
570 return -ENODEV;
571
572 padev = to_parisc_device(dev);
573 if (!padev)
574 return -ENODEV;
575
576 if (add_uevent_var(env, "PARISC_NAME=%s", padev->name))
577 return -ENOMEM;
578
579 make_modalias(dev, modalias);
580 if (add_uevent_var(env, "MODALIAS=%s", modalias))
581 return -ENOMEM;
582
583 return 0;
584}
585
586#define pa_dev_attr(name, field, format_string) \
587static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf) \
588{ \
589 struct parisc_device *padev = to_parisc_device(dev); \
590 return sprintf(buf, format_string, padev->field); \
591} \
592static DEVICE_ATTR_RO(name);
593
594#define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format)
595
596pa_dev_attr(irq, irq, "%u\n");
597pa_dev_attr_id(hw_type, "0x%02x\n");
598pa_dev_attr(rev, id.hversion_rev, "0x%x\n");
599pa_dev_attr_id(hversion, "0x%03x\n");
600pa_dev_attr_id(sversion, "0x%05x\n");
601
602static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
603{
604 return make_modalias(dev, buf);
605}
606static DEVICE_ATTR_RO(modalias);
607
608static struct attribute *parisc_device_attrs[] = {
609 &dev_attr_irq.attr,
610 &dev_attr_hw_type.attr,
611 &dev_attr_rev.attr,
612 &dev_attr_hversion.attr,
613 &dev_attr_sversion.attr,
614 &dev_attr_modalias.attr,
615 NULL,
616};
617ATTRIBUTE_GROUPS(parisc_device);
618
619const struct bus_type parisc_bus_type = {
620 .name = "parisc",
621 .match = parisc_generic_match,
622 .uevent = parisc_uevent,
623 .dev_groups = parisc_device_groups,
624 .probe = parisc_driver_probe,
625 .remove = __exit_p(parisc_driver_remove),
626};
627
628/**
629 * register_parisc_device - Locate a driver to manage this device.
630 * @dev: The parisc device.
631 *
632 * Search the driver list for a driver that is willing to manage
633 * this device.
634 */
635int __init register_parisc_device(struct parisc_device *dev)
636{
637 if (!dev)
638 return 0;
639
640 if (dev->driver)
641 return 1;
642
643 return 0;
644}
645
646/**
647 * match_pci_device - Matches a pci device against a given hardware path
648 * entry.
649 * @dev: the generic device (known to be contained by a pci_dev).
650 * @index: the current BC index
651 * @modpath: the hardware path.
652 * @return: true if the device matches the hardware path.
653 */
654static int match_pci_device(struct device *dev, int index,
655 struct hardware_path *modpath)
656{
657 struct pci_dev *pdev = to_pci_dev(dev);
658 int id;
659
660 if (index == 5) {
661 /* we are at the end of the path, and on the actual device */
662 unsigned int devfn = pdev->devfn;
663 return ((modpath->bc[5] == PCI_SLOT(devfn)) &&
664 (modpath->mod == PCI_FUNC(devfn)));
665 }
666
667 /* index might be out of bounds for bc[] */
668 if (index >= 6)
669 return 0;
670
671 id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5);
672 return (modpath->bc[index] == id);
673}
674
675/**
676 * match_parisc_device - Matches a parisc device against a given hardware
677 * path entry.
678 * @dev: the generic device (known to be contained by a parisc_device).
679 * @index: the current BC index
680 * @modpath: the hardware path.
681 * @return: true if the device matches the hardware path.
682 */
683static int match_parisc_device(struct device *dev, int index,
684 struct hardware_path *modpath)
685{
686 struct parisc_device *curr = to_parisc_device(dev);
687 char id = (index == 6) ? modpath->mod : modpath->bc[index];
688
689 return (curr->hw_path == id);
690}
691
692struct parse_tree_data {
693 int index;
694 struct hardware_path * modpath;
695 struct device * dev;
696};
697
698static int check_parent(struct device * dev, void * data)
699{
700 struct parse_tree_data * d = data;
701
702 if (check_dev(dev)) {
703 if (dev->bus == &parisc_bus_type) {
704 if (match_parisc_device(dev, d->index, d->modpath))
705 d->dev = dev;
706 } else if (dev_is_pci(dev)) {
707 if (match_pci_device(dev, d->index, d->modpath))
708 d->dev = dev;
709 } else if (dev->bus == NULL) {
710 /* we are on a bus bridge */
711 struct device *new = parse_tree_node(dev, d->index, d->modpath);
712 if (new)
713 d->dev = new;
714 }
715 }
716 return d->dev != NULL;
717}
718
719/**
720 * parse_tree_node - returns a device entry in the iotree
721 * @parent: the parent node in the tree
722 * @index: the current BC index
723 * @modpath: the hardware_path struct to match a device against
724 * @return: The corresponding device if found, NULL otherwise.
725 *
726 * Checks all the children of @parent for a matching @id. If none
727 * found, it returns NULL.
728 */
729static struct device *
730parse_tree_node(struct device *parent, int index, struct hardware_path *modpath)
731{
732 struct parse_tree_data d = {
733 .index = index,
734 .modpath = modpath,
735 };
736
737 struct recurse_struct recurse_data = {
738 .obj = &d,
739 .fn = check_parent,
740 };
741
742 if (device_for_each_child(parent, &recurse_data, descend_children))
743 { /* nothing */ }
744
745 return d.dev;
746}
747
748/**
749 * hwpath_to_device - Finds the generic device corresponding to a given hardware path.
750 * @modpath: the hardware path.
751 * @return: The target device, NULL if not found.
752 */
753struct device *hwpath_to_device(struct hardware_path *modpath)
754{
755 int i;
756 struct device *parent = root;
757 for (i = 0; i < 6; i++) {
758 if (modpath->bc[i] == -1)
759 continue;
760 parent = parse_tree_node(parent, i, modpath);
761 if (!parent)
762 return NULL;
763 }
764 if (dev_is_pci(parent)) /* pci devices already parse MOD */
765 return parent;
766 else
767 return parse_tree_node(parent, 6, modpath);
768}
769EXPORT_SYMBOL(hwpath_to_device);
770
771/**
772 * device_to_hwpath - Populates the hwpath corresponding to the given device.
773 * @dev: the target device
774 * @path: pointer to a previously allocated hwpath struct to be filled in
775 */
776void device_to_hwpath(struct device *dev, struct hardware_path *path)
777{
778 struct parisc_device *padev;
779 if (dev->bus == &parisc_bus_type) {
780 padev = to_parisc_device(dev);
781 get_node_path(dev->parent, path);
782 path->mod = padev->hw_path;
783 } else if (dev_is_pci(dev)) {
784 get_node_path(dev, path);
785 }
786}
787EXPORT_SYMBOL(device_to_hwpath);
788
789#define BC_PORT_MASK 0x8
790#define BC_LOWER_PORT 0x8
791
792#define BUS_CONVERTER(dev) \
793 ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT))
794
795#define IS_LOWER_PORT(dev) \
796 ((gsc_readl(dev->hpa.start + offsetof(struct bc_module, io_status)) \
797 & BC_PORT_MASK) == BC_LOWER_PORT)
798
799#define MAX_NATIVE_DEVICES 64
800#define NATIVE_DEVICE_OFFSET 0x1000
801
802#define FLEX_MASK F_EXTEND(0xfffc0000)
803#define IO_IO_LOW offsetof(struct bc_module, io_io_low)
804#define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
805#define READ_IO_IO_LOW(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_LOW)
806#define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_HIGH)
807
808static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
809 struct device *parent);
810
811static void __init walk_lower_bus(struct parisc_device *dev)
812{
813 unsigned long io_io_low, io_io_high;
814
815 if (!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev))
816 return;
817
818 if (dev->id.hw_type == HPHW_IOA) {
819 io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16);
820 io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET;
821 } else {
822 io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK;
823 io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK;
824 }
825
826 walk_native_bus(io_io_low, io_io_high, &dev->dev);
827}
828
829/**
830 * walk_native_bus -- Probe a bus for devices
831 * @io_io_low: Base address of this bus.
832 * @io_io_high: Last address of this bus.
833 * @parent: The parent bus device.
834 *
835 * A native bus (eg Runway or GSC) may have up to 64 devices on it,
836 * spaced at intervals of 0x1000 bytes. PDC may not inform us of these
837 * devices, so we have to probe for them. Unfortunately, we may find
838 * devices which are not physically connected (such as extra serial &
839 * keyboard ports). This problem is not yet solved.
840 */
841static void __init walk_native_bus(unsigned long io_io_low,
842 unsigned long io_io_high, struct device *parent)
843{
844 int i, devices_found = 0;
845 unsigned long hpa = io_io_low;
846 struct hardware_path path;
847
848 get_node_path(parent, &path);
849 do {
850 for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += NATIVE_DEVICE_OFFSET) {
851 struct parisc_device *dev;
852
853 /* Was the device already added by Firmware? */
854 dev = find_device_by_addr(hpa);
855 if (!dev) {
856 path.mod = i;
857 dev = alloc_pa_dev(hpa, &path);
858 if (!dev)
859 continue;
860
861 register_parisc_device(dev);
862 devices_found++;
863 }
864 walk_lower_bus(dev);
865 }
866 } while(!devices_found && hpa < io_io_high);
867}
868
869#define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000)
870
871/**
872 * walk_central_bus - Find devices attached to the central bus
873 *
874 * PDC doesn't tell us about all devices in the system. This routine
875 * finds devices connected to the central bus.
876 */
877void __init walk_central_bus(void)
878{
879 walk_native_bus(CENTRAL_BUS_ADDR,
880 CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET),
881 root);
882}
883
884static __init void print_parisc_device(struct parisc_device *dev)
885{
886 static int count __initdata;
887
888 pr_info("%d. %s at %pap { type:%d, hv:%#x, sv:%#x, rev:%#x }",
889 ++count, dev->name, &(dev->hpa.start), dev->id.hw_type,
890 dev->id.hversion, dev->id.sversion, dev->id.hversion_rev);
891
892 if (dev->num_addrs) {
893 int k;
894 pr_cont(", additional addresses: ");
895 for (k = 0; k < dev->num_addrs; k++)
896 pr_cont("0x%lx ", dev->addr[k]);
897 }
898 pr_cont("\n");
899}
900
901/**
902 * init_parisc_bus - Some preparation to be done before inventory
903 */
904void __init init_parisc_bus(void)
905{
906 if (bus_register(&parisc_bus_type))
907 panic("Could not register PA-RISC bus type\n");
908
909 root = root_device_register("parisc");
910 if (IS_ERR(root))
911 panic("Could not register PA-RISC root device\n");
912}
913
914static __init void qemu_header(void)
915{
916 int num;
917 unsigned long *p;
918 char name_mpe[80];
919
920 pr_info("--- cut here ---\n");
921 pr_info("/* AUTO-GENERATED HEADER FILE FOR SEABIOS FIRMWARE */\n");
922 pr_cont("/* generated with Linux kernel */\n");
923 pr_cont("/* search for PARISC_QEMU_MACHINE_HEADER in Linux */\n\n");
924
925 pr_info("#define PARISC_MODEL \"%s\"\n",
926 boot_cpu_data.pdc.sys_model_name);
927 strcpy(name_mpe, boot_cpu_data.pdc.sys_model_name);
928 pdc_model_sysmodel(OS_ID_MPEXL, name_mpe);
929 pr_info("#define PARISC_MODEL_MPE \"%s\"\n\n", name_mpe);
930
931 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
932 pr_info("#define PARISC_PDC_MODEL 0x%lx, 0x%lx, 0x%lx, "
933 "0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx\n\n",
934 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9]);
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 memset(&iodc_data, 0, sizeof(iodc_data));
1002 status = pdc_iodc_read(&count, hpa, 0,
1003 &iodc_data, sizeof(iodc_data));
1004 if (status != PDC_OK) {
1005 pr_info("No IODC data for hpa 0x%08lx\n", hpa);
1006 return 0;
1007 }
1008
1009 pr_info("\n");
1010
1011 /* Prevent hung task messages when printing on serial console */
1012 cond_resched();
1013
1014 pr_info("#define HPA_%08lx_DESCRIPTION \"%s\"\n",
1015 hpa, parisc_hardware_description(&dev->id));
1016
1017 mod_index = 0;
1018 do {
1019 /* initialize device path for old machines */
1020 memset(&mod_path, 0xff, sizeof(mod_path));
1021 get_node_path(dev->dev.parent, &mod_path.path);
1022 mod_path.path.mod = dev->hw_path;
1023 memset(&pdc_mod_info, 0, sizeof(pdc_mod_info));
1024 status = pdc_system_map_find_mods(&pdc_mod_info,
1025 &mod_path, mod_index++);
1026 } while (status == PDC_OK && pdc_mod_info.mod_addr != hpa);
1027
1028 pr_info("static struct pdc_system_map_mod_info"
1029 " mod_info_hpa_%08lx = {\n", hpa);
1030 #define DO(member) \
1031 pr_cont("\t." #member " = 0x%x,\n", \
1032 (unsigned int)pdc_mod_info.member)
1033 DO(mod_addr);
1034 DO(mod_pgs);
1035 DO(add_addrs);
1036 pr_cont("};\n");
1037 #undef DO
1038 pr_info("static struct pdc_module_path "
1039 "mod_path_hpa_%08lx = {\n", hpa);
1040 pr_cont("\t.path = { ");
1041 pr_cont(".flags = 0x%x, ", mod_path.path.flags);
1042 pr_cont(".bc = { 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x }, ",
1043 (unsigned char)mod_path.path.bc[0],
1044 (unsigned char)mod_path.path.bc[1],
1045 (unsigned char)mod_path.path.bc[2],
1046 (unsigned char)mod_path.path.bc[3],
1047 (unsigned char)mod_path.path.bc[4],
1048 (unsigned char)mod_path.path.bc[5]);
1049 pr_cont(".mod = 0x%02x }\n", (unsigned char)mod_path.path.mod);
1050 pr_cont("};\n");
1051
1052 pr_info("static struct pdc_iodc iodc_data_hpa_%08lx = {\n", hpa);
1053 #define DO(member) \
1054 pr_cont("\t." #member " = 0x%04lx,\n", \
1055 (unsigned long)iodc_data.member)
1056 DO(hversion_model);
1057 DO(hversion);
1058 DO(spa);
1059 DO(type);
1060 DO(sversion_rev);
1061 DO(sversion_model);
1062 DO(sversion_opt);
1063 DO(rev);
1064 DO(dep);
1065 DO(features);
1066 DO(checksum);
1067 DO(length);
1068 #undef DO
1069 pr_cont("};\n");
1070
1071 pr_info("#define HPA_%08lx_num_addr %d\n", hpa, dev->num_addrs);
1072 pr_info("#define HPA_%08lx_add_addr ", hpa);
1073 count = 0;
1074 if (dev->num_addrs == 0)
1075 pr_cont("0");
1076 while (count < dev->num_addrs) {
1077 pr_cont("0x%08lx, ", dev->addr[count]);
1078 count++;
1079 }
1080 pr_cont("\n\n");
1081
1082 return 0;
1083}
1084
1085
1086
1087static __init int print_one_device(struct device * dev, void * data)
1088{
1089 struct parisc_device * pdev = to_parisc_device(dev);
1090
1091 if (check_dev(dev))
1092 print_parisc_device(pdev);
1093 return 0;
1094}
1095
1096/**
1097 * print_parisc_devices - Print out a list of devices found in this system
1098 */
1099void __init print_parisc_devices(void)
1100{
1101 for_each_padev(print_one_device, NULL);
1102 #define PARISC_QEMU_MACHINE_HEADER 0
1103 if (PARISC_QEMU_MACHINE_HEADER) {
1104 qemu_header();
1105 for_each_padev(qemu_print_iodc_data, NULL);
1106 qemu_footer();
1107 }
1108}