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 | |
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 | |
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, data: recurse_data, fn: 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 | |
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(dev: &root, data: &recurse_data, fn: 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 | */ |
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 | |
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 | |
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 | */ |
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(drv: &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 | |
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(driver: m->driver, dev: 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 | */ |
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(fn: match_and_count, data: &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 | */ |
220 | int unregister_parisc_driver(struct parisc_driver *driver) |
221 | { |
222 | driver_unregister(drv: &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 | |
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 | |
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(fn: find_device, data: &d); |
254 | return ret ? d.dev : NULL; |
255 | } |
256 | |
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 | |
273 | int __init machine_has_merced_bus(void) |
274 | { |
275 | int ret; |
276 | |
277 | ret = for_each_padev(fn: 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 * |
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 | */ |
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 | |
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(buf: output, fmt: "%u/" , (unsigned char) path->bc[i]); |
340 | } |
341 | output += sprintf(buf: output, fmt: "%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 | */ |
354 | char *print_pa_hwpath(struct parisc_device *dev, char *output) |
355 | { |
356 | struct hardware_path path; |
357 | |
358 | get_node_path(dev: dev->dev.parent, path: &path); |
359 | path.mod = dev->hw_path; |
360 | return print_hwpath(path: &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 | */ |
374 | void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path) |
375 | { |
376 | get_node_path(dev: &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 | */ |
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: &path, output); |
395 | } |
396 | EXPORT_SYMBOL(print_pci_hwpath); |
397 | |
398 | #endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */ |
399 | |
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(dev: padev->dev.parent, path: &path); |
408 | |
409 | for (i = 0; i < 6; i++) { |
410 | if (path.bc[i] == -1) |
411 | continue; |
412 | output += sprintf(buf: output, fmt: "%u:" , (unsigned char) path.bc[i]); |
413 | } |
414 | sprintf(buf: output, fmt: "%u" , (unsigned char) padev->hw_path); |
415 | dev_set_name(dev: &padev->dev, name); |
416 | } |
417 | |
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->dev)) { |
438 | kfree(objp: 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 | |
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 | */ |
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(dev: parent, data: &d, fn: match_by_id)) |
477 | return d.dev; |
478 | else |
479 | return create_tree_node(id, parent); |
480 | } |
481 | |
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, id: modpath->bc[i])->dev; |
490 | } |
491 | return alloc_tree_node(parent, id: modpath->mod); |
492 | } |
493 | |
494 | struct parisc_device * __init |
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(modpath: 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(buf: dev->name, size: sizeof(dev->name), fmt: "%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(parent: &iomem_resource, new: &dev->hpa)) |
546 | pr_warn("Unable to claim HPA %lx for device %s\n" , hpa, name); |
547 | |
548 | return dev; |
549 | } |
550 | |
551 | static int parisc_generic_match(struct device *dev, struct device_driver *drv) |
552 | { |
553 | return match_device(driver: to_parisc_driver(drv), dev: to_parisc_device(dev)); |
554 | } |
555 | |
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, fmt: "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 | |
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, format: "PARISC_NAME=%s" , padev->name)) |
579 | return -ENOMEM; |
580 | |
581 | make_modalias(dev, buf: modalias); |
582 | if (add_uevent_var(env, format: "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 | |
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 | const 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 | */ |
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 | */ |
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 | */ |
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 | |
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, index: d->index, modpath: d->modpath)) |
707 | d->dev = dev; |
708 | } else if (dev_is_pci(dev)) { |
709 | if (match_pci_device(dev, index: d->index, modpath: 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(parent: dev, index: d->index, modpath: 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 * |
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(dev: parent, data: &recurse_data, fn: 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 | */ |
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, index: 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, index: 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 | */ |
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: 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 | |
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, parent: &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 | */ |
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(dev: parent, path: &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, mod_path: &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 | */ |
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 | parent: &root); |
884 | } |
885 | |
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 | */ |
906 | void __init init_parisc_bus(void) |
907 | { |
908 | if (bus_register(bus: &parisc_bus_type)) |
909 | panic(fmt: "Could not register PA-RISC bus type\n" ); |
910 | if (device_register(dev: &root)) |
911 | panic(fmt: "Could not register PA-RISC root device\n" ); |
912 | get_device(dev: &root); |
913 | } |
914 | |
915 | static __init void (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, 0x%lx\n\n" , |
931 | p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9]); |
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 | |
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 | |
977 | static __init void (void) |
978 | { |
979 | pr_info("\n\n#define PARISC_DEVICE_LIST \\\n" ); |
980 | for_each_padev(fn: 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 */ |
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 | /* Prevent hung task messages when printing on serial console */ |
1008 | cond_resched(); |
1009 | |
1010 | pr_info("#define HPA_%08lx_DESCRIPTION \"%s\"\n" , |
1011 | hpa, parisc_hardware_description(&dev->id)); |
1012 | |
1013 | mod_index = 0; |
1014 | do { |
1015 | status = pdc_system_map_find_mods(&pdc_mod_info, |
1016 | &mod_path, mod_index++); |
1017 | } while (status == PDC_OK && pdc_mod_info.mod_addr != hpa); |
1018 | |
1019 | pr_info("static struct pdc_system_map_mod_info" |
1020 | " mod_info_hpa_%08lx = {\n" , hpa); |
1021 | #define DO(member) \ |
1022 | pr_cont("\t." #member " = 0x%x,\n", \ |
1023 | (unsigned int)pdc_mod_info.member) |
1024 | DO(mod_addr); |
1025 | DO(mod_pgs); |
1026 | DO(add_addrs); |
1027 | pr_cont("};\n" ); |
1028 | #undef DO |
1029 | pr_info("static struct pdc_module_path " |
1030 | "mod_path_hpa_%08lx = {\n" , hpa); |
1031 | pr_cont("\t.path = { " ); |
1032 | pr_cont(".flags = 0x%x, " , mod_path.path.flags); |
1033 | pr_cont(".bc = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }, " , |
1034 | (unsigned char)mod_path.path.bc[0], |
1035 | (unsigned char)mod_path.path.bc[1], |
1036 | (unsigned char)mod_path.path.bc[2], |
1037 | (unsigned char)mod_path.path.bc[3], |
1038 | (unsigned char)mod_path.path.bc[4], |
1039 | (unsigned char)mod_path.path.bc[5]); |
1040 | pr_cont(".mod = 0x%x " , mod_path.path.mod); |
1041 | pr_cont(" },\n" ); |
1042 | pr_cont("\t.layers = { 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x }\n" , |
1043 | mod_path.layers[0], mod_path.layers[1], mod_path.layers[2], |
1044 | mod_path.layers[3], mod_path.layers[4], mod_path.layers[5]); |
1045 | pr_cont("};\n" ); |
1046 | |
1047 | pr_info("static struct pdc_iodc iodc_data_hpa_%08lx = {\n" , hpa); |
1048 | #define DO(member) \ |
1049 | pr_cont("\t." #member " = 0x%04lx,\n", \ |
1050 | (unsigned long)iodc_data.member) |
1051 | DO(hversion_model); |
1052 | DO(hversion); |
1053 | DO(spa); |
1054 | DO(type); |
1055 | DO(sversion_rev); |
1056 | DO(sversion_model); |
1057 | DO(sversion_opt); |
1058 | DO(rev); |
1059 | DO(dep); |
1060 | DO(features); |
1061 | DO(checksum); |
1062 | DO(length); |
1063 | #undef DO |
1064 | pr_cont("\t/* pad: 0x%04x, 0x%04x */\n" , |
1065 | iodc_data.pad[0], iodc_data.pad[1]); |
1066 | pr_cont("};\n" ); |
1067 | |
1068 | pr_info("#define HPA_%08lx_num_addr %d\n" , hpa, dev->num_addrs); |
1069 | pr_info("#define HPA_%08lx_add_addr " , hpa); |
1070 | count = 0; |
1071 | if (dev->num_addrs == 0) |
1072 | pr_cont("0" ); |
1073 | while (count < dev->num_addrs) { |
1074 | pr_cont("0x%08lx, " , dev->addr[count]); |
1075 | count++; |
1076 | } |
1077 | pr_cont("\n\n" ); |
1078 | |
1079 | return 0; |
1080 | } |
1081 | |
1082 | |
1083 | |
1084 | static __init int print_one_device(struct device * dev, void * data) |
1085 | { |
1086 | struct parisc_device * pdev = to_parisc_device(dev); |
1087 | |
1088 | if (check_dev(dev)) |
1089 | print_parisc_device(dev: pdev); |
1090 | return 0; |
1091 | } |
1092 | |
1093 | /** |
1094 | * print_parisc_devices - Print out a list of devices found in this system |
1095 | */ |
1096 | void __init print_parisc_devices(void) |
1097 | { |
1098 | for_each_padev(fn: print_one_device, NULL); |
1099 | #define 0 |
1100 | if (PARISC_QEMU_MACHINE_HEADER) { |
1101 | qemu_header(); |
1102 | for_each_padev(fn: qemu_print_iodc_data, NULL); |
1103 | qemu_footer(); |
1104 | } |
1105 | } |
1106 | |