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 <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 */
41 const struct dma_map_ops *hppa_dma_ops __ro_after_init;
42 EXPORT_SYMBOL(hppa_dma_ops);
43
44 static struct device root = {
45 .init_name = "parisc",
46 };
47
check_dev(struct device * dev)48 static 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
58 static struct device *
59 parse_tree_node(struct device *parent, int index, struct hardware_path *modpath);
60
61 struct recurse_struct {
62 void * obj;
63 int (*fn)(struct device *, void *);
64 };
65
descend_children(struct device * dev,void * data)66 static 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
for_each_padev(int (* fn)(struct device *,void *),void * data)86 static 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 */
match_device(struct parisc_driver * driver,struct parisc_device * dev)100 static 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
parisc_driver_probe(struct device * dev)122 static 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
parisc_driver_remove(struct device * dev)136 static void __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
141 if (pa_drv->remove)
142 pa_drv->remove(pa_dev);
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 */
register_parisc_driver(struct parisc_driver * driver)150 int 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 }
175 EXPORT_SYMBOL(register_parisc_driver);
176
177
178 struct match_count {
179 struct parisc_driver * driver;
180 int count;
181 };
182
match_and_count(struct device * dev,void * data)183 static 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 */
count_parisc_driver(struct parisc_driver * driver)202 int __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 */
unregister_parisc_driver(struct parisc_driver * driver)220 int unregister_parisc_driver(struct parisc_driver *driver)
221 {
222 driver_unregister(&driver->drv);
223 return 0;
224 }
225 EXPORT_SYMBOL(unregister_parisc_driver);
226
227 struct find_data {
228 unsigned long hpa;
229 struct parisc_device * dev;
230 };
231
find_device(struct device * dev,void * data)232 static 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
find_device_by_addr(unsigned long hpa)246 static 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
is_IKE_device(struct device * dev,void * data)257 static 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
machine_has_merced_bus(void)273 int __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 * @padev: 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 */
289 const struct parisc_device *
find_pa_parent_type(const struct parisc_device * padev,int type)290 find_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 */
get_node_path(struct device * dev,struct hardware_path * path)310 static 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
print_hwpath(struct hardware_path * path,char * output)333 static 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 */
print_pa_hwpath(struct parisc_device * dev,char * output)354 char *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 }
362 EXPORT_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 */
get_pci_node_path(struct pci_dev * pdev,struct hardware_path * path)374 void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path)
375 {
376 get_node_path(&pdev->dev, path);
377 }
378 EXPORT_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 */
print_pci_hwpath(struct pci_dev * dev,char * output)389 char *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 }
396 EXPORT_SYMBOL(print_pci_hwpath);
397
398 #endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */
399
setup_bus_id(struct parisc_device * padev)400 static 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
create_tree_node(char id,struct device * parent)418 static struct parisc_device * __init create_tree_node(char id,
419 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
445 struct match_id_data {
446 char id;
447 struct parisc_device * dev;
448 };
449
match_by_id(struct device * dev,void * data)450 static 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 */
alloc_tree_node(struct device * parent,char id)470 static 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
create_parisc_device(struct hardware_path * modpath)482 static 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
494 struct parisc_device * __init
alloc_pa_dev(unsigned long hpa,struct hardware_path * mod_path)495 alloc_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.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 dev->hpa.name = dev->name;
538 name = parisc_hardware_description(&dev->id) ? : "unknown";
539 snprintf(dev->name, sizeof(dev->name), "%s [%s]",
540 name, parisc_pathname(dev));
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
parisc_generic_match(struct device * dev,struct device_driver * drv)551 static 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
make_modalias(const struct device * dev,char * buf)556 static ssize_t make_modalias(const 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
parisc_uevent(const struct device * dev,struct kobj_uevent_env * env)566 static int parisc_uevent(const 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) \
589 static 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 } \
594 static DEVICE_ATTR_RO(name);
595
596 #define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format)
597
598 pa_dev_attr(irq, irq, "%u\n");
599 pa_dev_attr_id(hw_type, "0x%02x\n");
600 pa_dev_attr(rev, id.hversion_rev, "0x%x\n");
601 pa_dev_attr_id(hversion, "0x%03x\n");
602 pa_dev_attr_id(sversion, "0x%05x\n");
603
modalias_show(struct device * dev,struct device_attribute * attr,char * buf)604 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
605 {
606 return make_modalias(dev, buf);
607 }
608 static DEVICE_ATTR_RO(modalias);
609
610 static 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 };
619 ATTRIBUTE_GROUPS(parisc_device);
620
621 struct 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 */
register_parisc_device(struct parisc_device * dev)637 int __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 */
match_pci_device(struct device * dev,int index,struct hardware_path * modpath)656 static 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 */
match_parisc_device(struct device * dev,int index,struct hardware_path * modpath)685 static 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
694 struct parse_tree_data {
695 int index;
696 struct hardware_path * modpath;
697 struct device * dev;
698 };
699
check_parent(struct device * dev,void * data)700 static 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 */
731 static struct device *
parse_tree_node(struct device * parent,int index,struct hardware_path * modpath)732 parse_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 */
hwpath_to_device(struct hardware_path * modpath)755 struct 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 }
771 EXPORT_SYMBOL(hwpath_to_device);
772
773 /**
774 * device_to_hwpath - Populates the hwpath corresponding to the given device.
775 * @dev: the target device
776 * @path: pointer to a previously allocated hwpath struct to be filled in
777 */
device_to_hwpath(struct device * dev,struct hardware_path * path)778 void 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 }
789 EXPORT_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
810 static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
811 struct device *parent);
812
walk_lower_bus(struct parisc_device * dev)813 static void __init 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 */
walk_native_bus(unsigned long io_io_low,unsigned long io_io_high,struct device * parent)843 static 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 */
walk_central_bus(void)879 void __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
print_parisc_device(struct parisc_device * dev)886 static __init void print_parisc_device(struct parisc_device *dev)
887 {
888 static int count __initdata;
889
890 pr_info("%d. %s at %pap { type:%d, hv:%#x, sv:%#x, rev:%#x }",
891 ++count, dev->name, &(dev->hpa.start), dev->id.hw_type,
892 dev->id.hversion, dev->id.sversion, dev->id.hversion_rev);
893
894 if (dev->num_addrs) {
895 int k;
896 pr_cont(", additional addresses: ");
897 for (k = 0; k < dev->num_addrs; k++)
898 pr_cont("0x%lx ", dev->addr[k]);
899 }
900 pr_cont("\n");
901 }
902
903 /**
904 * init_parisc_bus - Some preparation to be done before inventory
905 */
init_parisc_bus(void)906 void __init init_parisc_bus(void)
907 {
908 if (bus_register(&parisc_bus_type))
909 panic("Could not register PA-RISC bus type\n");
910 if (device_register(&root))
911 panic("Could not register PA-RISC root device\n");
912 get_device(&root);
913 }
914
qemu_header(void)915 static __init void qemu_header(void)
916 {
917 int num;
918 unsigned long *p;
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\n",
926 boot_cpu_data.pdc.sys_model_name);
927
928 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
929 pr_info("#define PARISC_PDC_MODEL 0x%lx, 0x%lx, 0x%lx, "
930 "0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx\n\n",
931 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
932 #undef p
933
934 pr_info("#define PARISC_PDC_VERSION 0x%04lx\n\n",
935 boot_cpu_data.pdc.versions);
936
937 pr_info("#define PARISC_PDC_CPUID 0x%04lx\n\n",
938 boot_cpu_data.pdc.cpuid);
939
940 pr_info("#define PARISC_PDC_CAPABILITIES 0x%04lx\n\n",
941 boot_cpu_data.pdc.capabilities);
942
943 pr_info("#define PARISC_PDC_ENTRY_ORG 0x%04lx\n\n",
944 #ifdef CONFIG_64BIT
945 (unsigned long)(PAGE0->mem_pdc_hi) << 32 |
946 #endif
947 (unsigned long)PAGE0->mem_pdc);
948
949 pr_info("#define PARISC_PDC_CACHE_INFO");
950 p = (unsigned long *) &cache_info;
951 for (num = 0; num < sizeof(cache_info); num += sizeof(unsigned long)) {
952 if (((num % 5) == 0)) {
953 pr_cont(" \\\n");
954 pr_info("\t");
955 }
956 pr_cont("%s0x%04lx",
957 num?", ":"", *p++);
958 }
959 pr_cont("\n\n");
960 }
961
qemu_print_hpa(struct device * lin_dev,void * data)962 static __init int qemu_print_hpa(struct device *lin_dev, void *data)
963 {
964 struct parisc_device *dev = to_parisc_device(lin_dev);
965 unsigned long hpa = dev->hpa.start;
966
967 pr_cont("\t{\t.hpa = 0x%08lx,\\\n", hpa);
968 pr_cont("\t\t.iodc = &iodc_data_hpa_%08lx,\\\n", hpa);
969 pr_cont("\t\t.mod_info = &mod_info_hpa_%08lx,\\\n", hpa);
970 pr_cont("\t\t.mod_path = &mod_path_hpa_%08lx,\\\n", hpa);
971 pr_cont("\t\t.num_addr = HPA_%08lx_num_addr,\\\n", hpa);
972 pr_cont("\t\t.add_addr = { HPA_%08lx_add_addr } },\\\n", hpa);
973 return 0;
974 }
975
976
qemu_footer(void)977 static __init void qemu_footer(void)
978 {
979 pr_info("\n\n#define PARISC_DEVICE_LIST \\\n");
980 for_each_padev(qemu_print_hpa, NULL);
981 pr_cont("\t{ 0, }\n");
982 pr_info("--- cut here ---\n");
983 }
984
985 /* print iodc data of the various hpa modules for qemu inclusion */
qemu_print_iodc_data(struct device * lin_dev,void * data)986 static __init int qemu_print_iodc_data(struct device *lin_dev, void *data)
987 {
988 struct parisc_device *dev = to_parisc_device(lin_dev);
989 unsigned long count;
990 unsigned long hpa = dev->hpa.start;
991 int status;
992 struct pdc_iodc iodc_data;
993
994 int mod_index;
995 struct pdc_system_map_mod_info pdc_mod_info;
996 struct pdc_module_path mod_path;
997
998 status = pdc_iodc_read(&count, hpa, 0,
999 &iodc_data, sizeof(iodc_data));
1000 if (status != PDC_OK) {
1001 pr_info("No IODC data for hpa 0x%08lx\n", hpa);
1002 return 0;
1003 }
1004
1005 pr_info("\n");
1006
1007 pr_info("#define HPA_%08lx_DESCRIPTION \"%s\"\n",
1008 hpa, parisc_hardware_description(&dev->id));
1009
1010 mod_index = 0;
1011 do {
1012 status = pdc_system_map_find_mods(&pdc_mod_info,
1013 &mod_path, mod_index++);
1014 } while (status == PDC_OK && pdc_mod_info.mod_addr != hpa);
1015
1016 pr_info("static struct pdc_system_map_mod_info"
1017 " mod_info_hpa_%08lx = {\n", hpa);
1018 #define DO(member) \
1019 pr_cont("\t." #member " = 0x%x,\n", \
1020 (unsigned int)pdc_mod_info.member)
1021 DO(mod_addr);
1022 DO(mod_pgs);
1023 DO(add_addrs);
1024 pr_cont("};\n");
1025 #undef DO
1026 pr_info("static struct pdc_module_path "
1027 "mod_path_hpa_%08lx = {\n", hpa);
1028 pr_cont("\t.path = { ");
1029 pr_cont(".flags = 0x%x, ", mod_path.path.flags);
1030 pr_cont(".bc = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }, ",
1031 (unsigned char)mod_path.path.bc[0],
1032 (unsigned char)mod_path.path.bc[1],
1033 (unsigned char)mod_path.path.bc[2],
1034 (unsigned char)mod_path.path.bc[3],
1035 (unsigned char)mod_path.path.bc[4],
1036 (unsigned char)mod_path.path.bc[5]);
1037 pr_cont(".mod = 0x%x ", mod_path.path.mod);
1038 pr_cont(" },\n");
1039 pr_cont("\t.layers = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }\n",
1040 mod_path.layers[0], mod_path.layers[1], mod_path.layers[2],
1041 mod_path.layers[3], mod_path.layers[4], mod_path.layers[5]);
1042 pr_cont("};\n");
1043
1044 pr_info("static struct pdc_iodc iodc_data_hpa_%08lx = {\n", hpa);
1045 #define DO(member) \
1046 pr_cont("\t." #member " = 0x%04lx,\n", \
1047 (unsigned long)iodc_data.member)
1048 DO(hversion_model);
1049 DO(hversion);
1050 DO(spa);
1051 DO(type);
1052 DO(sversion_rev);
1053 DO(sversion_model);
1054 DO(sversion_opt);
1055 DO(rev);
1056 DO(dep);
1057 DO(features);
1058 DO(checksum);
1059 DO(length);
1060 #undef DO
1061 pr_cont("\t/* pad: 0x%04x, 0x%04x */\n",
1062 iodc_data.pad[0], iodc_data.pad[1]);
1063 pr_cont("};\n");
1064
1065 pr_info("#define HPA_%08lx_num_addr %d\n", hpa, dev->num_addrs);
1066 pr_info("#define HPA_%08lx_add_addr ", hpa);
1067 count = 0;
1068 if (dev->num_addrs == 0)
1069 pr_cont("0");
1070 while (count < dev->num_addrs) {
1071 pr_cont("0x%08lx, ", dev->addr[count]);
1072 count++;
1073 }
1074 pr_cont("\n\n");
1075
1076 return 0;
1077 }
1078
1079
1080
print_one_device(struct device * dev,void * data)1081 static __init int print_one_device(struct device * dev, void * data)
1082 {
1083 struct parisc_device * pdev = to_parisc_device(dev);
1084
1085 if (check_dev(dev))
1086 print_parisc_device(pdev);
1087 return 0;
1088 }
1089
1090 /**
1091 * print_parisc_devices - Print out a list of devices found in this system
1092 */
print_parisc_devices(void)1093 void __init print_parisc_devices(void)
1094 {
1095 for_each_padev(print_one_device, NULL);
1096 #define PARISC_QEMU_MACHINE_HEADER 0
1097 if (PARISC_QEMU_MACHINE_HEADER) {
1098 qemu_header();
1099 for_each_padev(qemu_print_iodc_data, NULL);
1100 qemu_footer();
1101 }
1102 }
1103