1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * drivers.c
4 *
5 * Copyright (c) 1999 The Puffin Group
6 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
7 * Copyright (c) 2001 Helge Deller <deller@gmx.de>
8 * Copyright (c) 2001,2002 Ryan Bradetich
9 * Copyright (c) 2004-2005 Thibaut VARENE <varenet@parisc-linux.org>
10 *
11 * The file handles registering devices and drivers, then matching them.
12 * It's the closest we get to a dating agency.
13 *
14 * If you're thinking about modifying this file, here are some gotchas to
15 * bear in mind:
16 * - 715/Mirage device paths have a dummy device between Lasi and its children
17 * - The EISA adapter may show up as a sibling or child of Wax
18 * - Dino has an optionally functional serial port. If firmware enables it,
19 * it shows up as a child of Dino. If firmware disables it, the buswalk
20 * finds it and it shows up as a child of Cujo
21 * - Dino has both parisc and pci devices as children
22 * - parisc devices are discovered in a random order, including children
23 * before parents in some cases.
24 */
25
26 #include <linux/slab.h>
27 #include <linux/types.h>
28 #include <linux/kernel.h>
29 #include <linux/pci.h>
30 #include <linux/spinlock.h>
31 #include <linux/string.h>
32 #include <linux/export.h>
33 #include <linux/dma-map-ops.h>
34 #include <asm/hardware.h>
35 #include <asm/io.h>
36 #include <asm/pdc.h>
37 #include <asm/parisc-device.h>
38 #include <asm/ropes.h>
39
40 /* See comments in include/asm-parisc/pci.h */
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 * @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 */
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 struct 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
444 struct match_id_data {
445 char id;
446 struct parisc_device * dev;
447 };
448
match_by_id(struct device * dev,void * data)449 static 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 */
alloc_tree_node(struct device * parent,char id)469 static 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
create_parisc_device(struct hardware_path * modpath)481 static 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
493 struct parisc_device * __init
alloc_pa_dev(unsigned long hpa,struct hardware_path * mod_path)494 alloc_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.start = hpa;
524 /* This is awkward. The STI spec says that gfx devices may occupy
525 * 32MB or 64MB. Unfortunately, we don't know how to tell whether
526 * it's the former or the latter. Assumptions either way can hurt us.
527 */
528 if (hpa == 0xf4000000 || hpa == 0xf8000000) {
529 dev->hpa.end = hpa + 0x03ffffff;
530 } else if (hpa == 0xf6000000 || hpa == 0xfa000000) {
531 dev->hpa.end = hpa + 0x01ffffff;
532 } else {
533 dev->hpa.end = hpa + 0xfff;
534 }
535 dev->hpa.flags = IORESOURCE_MEM;
536 dev->hpa.name = dev->name;
537 name = parisc_hardware_description(&dev->id) ? : "unknown";
538 snprintf(dev->name, sizeof(dev->name), "%s [%s]",
539 name, parisc_pathname(dev));
540
541 /* Silently fail things like mouse ports which are subsumed within
542 * the keyboard controller
543 */
544 if ((hpa & 0xfff) == 0 && insert_resource(&iomem_resource, &dev->hpa))
545 pr_warn("Unable to claim HPA %lx for device %s\n", hpa, name);
546
547 return dev;
548 }
549
parisc_generic_match(struct device * dev,struct device_driver * drv)550 static int parisc_generic_match(struct device *dev, struct device_driver *drv)
551 {
552 return match_device(to_parisc_driver(drv), to_parisc_device(dev));
553 }
554
make_modalias(struct device * dev,char * buf)555 static ssize_t make_modalias(struct device *dev, char *buf)
556 {
557 const struct parisc_device *padev = to_parisc_device(dev);
558 const struct parisc_device_id *id = &padev->id;
559
560 return sprintf(buf, "parisc:t%02Xhv%04Xrev%02Xsv%08X\n",
561 (u8)id->hw_type, (u16)id->hversion, (u8)id->hversion_rev,
562 (u32)id->sversion);
563 }
564
parisc_uevent(struct device * dev,struct kobj_uevent_env * env)565 static int parisc_uevent(struct device *dev, struct kobj_uevent_env *env)
566 {
567 const struct parisc_device *padev;
568 char modalias[40];
569
570 if (!dev)
571 return -ENODEV;
572
573 padev = to_parisc_device(dev);
574 if (!padev)
575 return -ENODEV;
576
577 if (add_uevent_var(env, "PARISC_NAME=%s", padev->name))
578 return -ENOMEM;
579
580 make_modalias(dev, modalias);
581 if (add_uevent_var(env, "MODALIAS=%s", modalias))
582 return -ENOMEM;
583
584 return 0;
585 }
586
587 #define pa_dev_attr(name, field, format_string) \
588 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf) \
589 { \
590 struct parisc_device *padev = to_parisc_device(dev); \
591 return sprintf(buf, format_string, padev->field); \
592 } \
593 static DEVICE_ATTR_RO(name);
594
595 #define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format)
596
597 pa_dev_attr(irq, irq, "%u\n");
598 pa_dev_attr_id(hw_type, "0x%02x\n");
599 pa_dev_attr(rev, id.hversion_rev, "0x%x\n");
600 pa_dev_attr_id(hversion, "0x%03x\n");
601 pa_dev_attr_id(sversion, "0x%05x\n");
602
modalias_show(struct device * dev,struct device_attribute * attr,char * buf)603 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
604 {
605 return make_modalias(dev, buf);
606 }
607 static DEVICE_ATTR_RO(modalias);
608
609 static struct attribute *parisc_device_attrs[] = {
610 &dev_attr_irq.attr,
611 &dev_attr_hw_type.attr,
612 &dev_attr_rev.attr,
613 &dev_attr_hversion.attr,
614 &dev_attr_sversion.attr,
615 &dev_attr_modalias.attr,
616 NULL,
617 };
618 ATTRIBUTE_GROUPS(parisc_device);
619
620 struct bus_type parisc_bus_type = {
621 .name = "parisc",
622 .match = parisc_generic_match,
623 .uevent = parisc_uevent,
624 .dev_groups = parisc_device_groups,
625 .probe = parisc_driver_probe,
626 .remove = __exit_p(parisc_driver_remove),
627 };
628
629 /**
630 * register_parisc_device - Locate a driver to manage this device.
631 * @dev: The parisc device.
632 *
633 * Search the driver list for a driver that is willing to manage
634 * this device.
635 */
register_parisc_device(struct parisc_device * dev)636 int __init register_parisc_device(struct parisc_device *dev)
637 {
638 if (!dev)
639 return 0;
640
641 if (dev->driver)
642 return 1;
643
644 return 0;
645 }
646
647 /**
648 * match_pci_device - Matches a pci device against a given hardware path
649 * entry.
650 * @dev: the generic device (known to be contained by a pci_dev).
651 * @index: the current BC index
652 * @modpath: the hardware path.
653 * @return: true if the device matches the hardware path.
654 */
match_pci_device(struct device * dev,int index,struct hardware_path * modpath)655 static int match_pci_device(struct device *dev, int index,
656 struct hardware_path *modpath)
657 {
658 struct pci_dev *pdev = to_pci_dev(dev);
659 int id;
660
661 if (index == 5) {
662 /* we are at the end of the path, and on the actual device */
663 unsigned int devfn = pdev->devfn;
664 return ((modpath->bc[5] == PCI_SLOT(devfn)) &&
665 (modpath->mod == PCI_FUNC(devfn)));
666 }
667
668 /* index might be out of bounds for bc[] */
669 if (index >= 6)
670 return 0;
671
672 id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5);
673 return (modpath->bc[index] == id);
674 }
675
676 /**
677 * match_parisc_device - Matches a parisc device against a given hardware
678 * path entry.
679 * @dev: the generic device (known to be contained by a parisc_device).
680 * @index: the current BC index
681 * @modpath: the hardware path.
682 * @return: true if the device matches the hardware path.
683 */
match_parisc_device(struct device * dev,int index,struct hardware_path * modpath)684 static int match_parisc_device(struct device *dev, int index,
685 struct hardware_path *modpath)
686 {
687 struct parisc_device *curr = to_parisc_device(dev);
688 char id = (index == 6) ? modpath->mod : modpath->bc[index];
689
690 return (curr->hw_path == id);
691 }
692
693 struct parse_tree_data {
694 int index;
695 struct hardware_path * modpath;
696 struct device * dev;
697 };
698
check_parent(struct device * dev,void * data)699 static int check_parent(struct device * dev, void * data)
700 {
701 struct parse_tree_data * d = data;
702
703 if (check_dev(dev)) {
704 if (dev->bus == &parisc_bus_type) {
705 if (match_parisc_device(dev, d->index, d->modpath))
706 d->dev = dev;
707 } else if (dev_is_pci(dev)) {
708 if (match_pci_device(dev, d->index, d->modpath))
709 d->dev = dev;
710 } else if (dev->bus == NULL) {
711 /* we are on a bus bridge */
712 struct device *new = parse_tree_node(dev, d->index, d->modpath);
713 if (new)
714 d->dev = new;
715 }
716 }
717 return d->dev != NULL;
718 }
719
720 /**
721 * parse_tree_node - returns a device entry in the iotree
722 * @parent: the parent node in the tree
723 * @index: the current BC index
724 * @modpath: the hardware_path struct to match a device against
725 * @return: The corresponding device if found, NULL otherwise.
726 *
727 * Checks all the children of @parent for a matching @id. If none
728 * found, it returns NULL.
729 */
730 static struct device *
parse_tree_node(struct device * parent,int index,struct hardware_path * modpath)731 parse_tree_node(struct device *parent, int index, struct hardware_path *modpath)
732 {
733 struct parse_tree_data d = {
734 .index = index,
735 .modpath = modpath,
736 };
737
738 struct recurse_struct recurse_data = {
739 .obj = &d,
740 .fn = check_parent,
741 };
742
743 if (device_for_each_child(parent, &recurse_data, descend_children))
744 /* nothing */;
745
746 return d.dev;
747 }
748
749 /**
750 * hwpath_to_device - Finds the generic device corresponding to a given hardware path.
751 * @modpath: the hardware path.
752 * @return: The target device, NULL if not found.
753 */
hwpath_to_device(struct hardware_path * modpath)754 struct device *hwpath_to_device(struct hardware_path *modpath)
755 {
756 int i;
757 struct device *parent = &root;
758 for (i = 0; i < 6; i++) {
759 if (modpath->bc[i] == -1)
760 continue;
761 parent = parse_tree_node(parent, i, modpath);
762 if (!parent)
763 return NULL;
764 }
765 if (dev_is_pci(parent)) /* pci devices already parse MOD */
766 return parent;
767 else
768 return parse_tree_node(parent, 6, modpath);
769 }
770 EXPORT_SYMBOL(hwpath_to_device);
771
772 /**
773 * device_to_hwpath - Populates the hwpath corresponding to the given device.
774 * @param dev the target device
775 * @param path pointer to a previously allocated hwpath struct to be filled in
776 */
device_to_hwpath(struct device * dev,struct hardware_path * path)777 void device_to_hwpath(struct device *dev, struct hardware_path *path)
778 {
779 struct parisc_device *padev;
780 if (dev->bus == &parisc_bus_type) {
781 padev = to_parisc_device(dev);
782 get_node_path(dev->parent, path);
783 path->mod = padev->hw_path;
784 } else if (dev_is_pci(dev)) {
785 get_node_path(dev, path);
786 }
787 }
788 EXPORT_SYMBOL(device_to_hwpath);
789
790 #define BC_PORT_MASK 0x8
791 #define BC_LOWER_PORT 0x8
792
793 #define BUS_CONVERTER(dev) \
794 ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT))
795
796 #define IS_LOWER_PORT(dev) \
797 ((gsc_readl(dev->hpa.start + offsetof(struct bc_module, io_status)) \
798 & BC_PORT_MASK) == BC_LOWER_PORT)
799
800 #define MAX_NATIVE_DEVICES 64
801 #define NATIVE_DEVICE_OFFSET 0x1000
802
803 #define FLEX_MASK F_EXTEND(0xfffc0000)
804 #define IO_IO_LOW offsetof(struct bc_module, io_io_low)
805 #define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
806 #define READ_IO_IO_LOW(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_LOW)
807 #define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_HIGH)
808
809 static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
810 struct device *parent);
811
walk_lower_bus(struct parisc_device * dev)812 static void __init walk_lower_bus(struct parisc_device *dev)
813 {
814 unsigned long io_io_low, io_io_high;
815
816 if (!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev))
817 return;
818
819 if (dev->id.hw_type == HPHW_IOA) {
820 io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16);
821 io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET;
822 } else {
823 io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK;
824 io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK;
825 }
826
827 walk_native_bus(io_io_low, io_io_high, &dev->dev);
828 }
829
830 /**
831 * walk_native_bus -- Probe a bus for devices
832 * @io_io_low: Base address of this bus.
833 * @io_io_high: Last address of this bus.
834 * @parent: The parent bus device.
835 *
836 * A native bus (eg Runway or GSC) may have up to 64 devices on it,
837 * spaced at intervals of 0x1000 bytes. PDC may not inform us of these
838 * devices, so we have to probe for them. Unfortunately, we may find
839 * devices which are not physically connected (such as extra serial &
840 * keyboard ports). This problem is not yet solved.
841 */
walk_native_bus(unsigned long io_io_low,unsigned long io_io_high,struct device * parent)842 static void __init walk_native_bus(unsigned long io_io_low,
843 unsigned long io_io_high, struct device *parent)
844 {
845 int i, devices_found = 0;
846 unsigned long hpa = io_io_low;
847 struct hardware_path path;
848
849 get_node_path(parent, &path);
850 do {
851 for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += NATIVE_DEVICE_OFFSET) {
852 struct parisc_device *dev;
853
854 /* Was the device already added by Firmware? */
855 dev = find_device_by_addr(hpa);
856 if (!dev) {
857 path.mod = i;
858 dev = alloc_pa_dev(hpa, &path);
859 if (!dev)
860 continue;
861
862 register_parisc_device(dev);
863 devices_found++;
864 }
865 walk_lower_bus(dev);
866 }
867 } while(!devices_found && hpa < io_io_high);
868 }
869
870 #define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000)
871
872 /**
873 * walk_central_bus - Find devices attached to the central bus
874 *
875 * PDC doesn't tell us about all devices in the system. This routine
876 * finds devices connected to the central bus.
877 */
walk_central_bus(void)878 void __init walk_central_bus(void)
879 {
880 walk_native_bus(CENTRAL_BUS_ADDR,
881 CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET),
882 &root);
883 }
884
print_parisc_device(struct parisc_device * dev)885 static __init void print_parisc_device(struct parisc_device *dev)
886 {
887 static int count __initdata;
888
889 pr_info("%d. %s at %pap { type:%d, hv:%#x, sv:%#x, rev:%#x }",
890 ++count, dev->name, &(dev->hpa.start), dev->id.hw_type,
891 dev->id.hversion, dev->id.sversion, dev->id.hversion_rev);
892
893 if (dev->num_addrs) {
894 int k;
895 pr_cont(", additional addresses: ");
896 for (k = 0; k < dev->num_addrs; k++)
897 pr_cont("0x%lx ", dev->addr[k]);
898 }
899 pr_cont("\n");
900 }
901
902 /**
903 * init_parisc_bus - Some preparation to be done before inventory
904 */
init_parisc_bus(void)905 void __init init_parisc_bus(void)
906 {
907 if (bus_register(&parisc_bus_type))
908 panic("Could not register PA-RISC bus type\n");
909 if (device_register(&root))
910 panic("Could not register PA-RISC root device\n");
911 get_device(&root);
912 }
913
qemu_header(void)914 static __init void qemu_header(void)
915 {
916 int num;
917 unsigned long *p;
918
919 pr_info("--- cut here ---\n");
920 pr_info("/* AUTO-GENERATED HEADER FILE FOR SEABIOS FIRMWARE */\n");
921 pr_cont("/* generated with Linux kernel */\n");
922 pr_cont("/* search for PARISC_QEMU_MACHINE_HEADER in Linux */\n\n");
923
924 pr_info("#define PARISC_MODEL \"%s\"\n\n",
925 boot_cpu_data.pdc.sys_model_name);
926
927 pr_info("#define PARISC_PDC_MODEL 0x%lx, 0x%lx, 0x%lx, "
928 "0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx\n\n",
929 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
930 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
931 #undef p
932
933 pr_info("#define PARISC_PDC_VERSION 0x%04lx\n\n",
934 boot_cpu_data.pdc.versions);
935
936 pr_info("#define PARISC_PDC_CPUID 0x%04lx\n\n",
937 boot_cpu_data.pdc.cpuid);
938
939 pr_info("#define PARISC_PDC_CAPABILITIES 0x%04lx\n\n",
940 boot_cpu_data.pdc.capabilities);
941
942 pr_info("#define PARISC_PDC_ENTRY_ORG 0x%04lx\n\n",
943 #ifdef CONFIG_64BIT
944 (unsigned long)(PAGE0->mem_pdc_hi) << 32 |
945 #endif
946 (unsigned long)PAGE0->mem_pdc);
947
948 pr_info("#define PARISC_PDC_CACHE_INFO");
949 p = (unsigned long *) &cache_info;
950 for (num = 0; num < sizeof(cache_info); num += sizeof(unsigned long)) {
951 if (((num % 5) == 0)) {
952 pr_cont(" \\\n");
953 pr_info("\t");
954 }
955 pr_cont("%s0x%04lx",
956 num?", ":"", *p++);
957 }
958 pr_cont("\n\n");
959 }
960
qemu_print_hpa(struct device * lin_dev,void * data)961 static __init int qemu_print_hpa(struct device *lin_dev, void *data)
962 {
963 struct parisc_device *dev = to_parisc_device(lin_dev);
964 unsigned long hpa = dev->hpa.start;
965
966 pr_cont("\t{\t.hpa = 0x%08lx,\\\n", hpa);
967 pr_cont("\t\t.iodc = &iodc_data_hpa_%08lx,\\\n", hpa);
968 pr_cont("\t\t.mod_info = &mod_info_hpa_%08lx,\\\n", hpa);
969 pr_cont("\t\t.mod_path = &mod_path_hpa_%08lx,\\\n", hpa);
970 pr_cont("\t\t.num_addr = HPA_%08lx_num_addr,\\\n", hpa);
971 pr_cont("\t\t.add_addr = { HPA_%08lx_add_addr } },\\\n", hpa);
972 return 0;
973 }
974
975
qemu_footer(void)976 static __init void qemu_footer(void)
977 {
978 pr_info("\n\n#define PARISC_DEVICE_LIST \\\n");
979 for_each_padev(qemu_print_hpa, NULL);
980 pr_cont("\t{ 0, }\n");
981 pr_info("--- cut here ---\n");
982 }
983
984 /* print iodc data of the various hpa modules for qemu inclusion */
qemu_print_iodc_data(struct device * lin_dev,void * data)985 static __init int qemu_print_iodc_data(struct device *lin_dev, void *data)
986 {
987 struct parisc_device *dev = to_parisc_device(lin_dev);
988 unsigned long count;
989 unsigned long hpa = dev->hpa.start;
990 int status;
991 struct pdc_iodc iodc_data;
992
993 int mod_index;
994 struct pdc_system_map_mod_info pdc_mod_info;
995 struct pdc_module_path mod_path;
996
997 status = pdc_iodc_read(&count, hpa, 0,
998 &iodc_data, sizeof(iodc_data));
999 if (status != PDC_OK) {
1000 pr_info("No IODC data for hpa 0x%08lx\n", hpa);
1001 return 0;
1002 }
1003
1004 pr_info("\n");
1005
1006 pr_info("#define HPA_%08lx_DESCRIPTION \"%s\"\n",
1007 hpa, parisc_hardware_description(&dev->id));
1008
1009 mod_index = 0;
1010 do {
1011 status = pdc_system_map_find_mods(&pdc_mod_info,
1012 &mod_path, mod_index++);
1013 } while (status == PDC_OK && pdc_mod_info.mod_addr != hpa);
1014
1015 pr_info("static struct pdc_system_map_mod_info"
1016 " mod_info_hpa_%08lx = {\n", hpa);
1017 #define DO(member) \
1018 pr_cont("\t." #member " = 0x%x,\n", \
1019 (unsigned int)pdc_mod_info.member)
1020 DO(mod_addr);
1021 DO(mod_pgs);
1022 DO(add_addrs);
1023 pr_cont("};\n");
1024 #undef DO
1025 pr_info("static struct pdc_module_path "
1026 "mod_path_hpa_%08lx = {\n", hpa);
1027 pr_cont("\t.path = { ");
1028 pr_cont(".flags = 0x%x, ", mod_path.path.flags);
1029 pr_cont(".bc = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }, ",
1030 (unsigned char)mod_path.path.bc[0],
1031 (unsigned char)mod_path.path.bc[1],
1032 (unsigned char)mod_path.path.bc[2],
1033 (unsigned char)mod_path.path.bc[3],
1034 (unsigned char)mod_path.path.bc[4],
1035 (unsigned char)mod_path.path.bc[5]);
1036 pr_cont(".mod = 0x%x ", mod_path.path.mod);
1037 pr_cont(" },\n");
1038 pr_cont("\t.layers = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }\n",
1039 mod_path.layers[0], mod_path.layers[1], mod_path.layers[2],
1040 mod_path.layers[3], mod_path.layers[4], mod_path.layers[5]);
1041 pr_cont("};\n");
1042
1043 pr_info("static struct pdc_iodc iodc_data_hpa_%08lx = {\n", hpa);
1044 #define DO(member) \
1045 pr_cont("\t." #member " = 0x%04lx,\n", \
1046 (unsigned long)iodc_data.member)
1047 DO(hversion_model);
1048 DO(hversion);
1049 DO(spa);
1050 DO(type);
1051 DO(sversion_rev);
1052 DO(sversion_model);
1053 DO(sversion_opt);
1054 DO(rev);
1055 DO(dep);
1056 DO(features);
1057 DO(checksum);
1058 DO(length);
1059 #undef DO
1060 pr_cont("\t/* pad: 0x%04x, 0x%04x */\n",
1061 iodc_data.pad[0], iodc_data.pad[1]);
1062 pr_cont("};\n");
1063
1064 pr_info("#define HPA_%08lx_num_addr %d\n", hpa, dev->num_addrs);
1065 pr_info("#define HPA_%08lx_add_addr ", hpa);
1066 count = 0;
1067 if (dev->num_addrs == 0)
1068 pr_cont("0");
1069 while (count < dev->num_addrs) {
1070 pr_cont("0x%08lx, ", dev->addr[count]);
1071 count++;
1072 }
1073 pr_cont("\n\n");
1074
1075 return 0;
1076 }
1077
1078
1079
print_one_device(struct device * dev,void * data)1080 static __init int print_one_device(struct device * dev, void * data)
1081 {
1082 struct parisc_device * pdev = to_parisc_device(dev);
1083
1084 if (check_dev(dev))
1085 print_parisc_device(pdev);
1086 return 0;
1087 }
1088
1089 /**
1090 * print_parisc_devices - Print out a list of devices found in this system
1091 */
print_parisc_devices(void)1092 void __init print_parisc_devices(void)
1093 {
1094 for_each_padev(print_one_device, NULL);
1095 #define PARISC_QEMU_MACHINE_HEADER 0
1096 if (PARISC_QEMU_MACHINE_HEADER) {
1097 qemu_header();
1098 for_each_padev(qemu_print_iodc_data, NULL);
1099 qemu_footer();
1100 }
1101 }
1102