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Linux/arch/parisc/kernel/drivers.c

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  1 /*
  2  * drivers.c
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public License
  6  * as published by the Free Software Foundation; either version
  7  * 2 of the License, or (at your option) any later version.
  8  *
  9  * Copyright (c) 1999 The Puffin Group
 10  * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
 11  * Copyright (c) 2001 Helge Deller <deller@gmx.de>
 12  * Copyright (c) 2001,2002 Ryan Bradetich 
 13  * Copyright (c) 2004-2005 Thibaut VARENE <varenet@parisc-linux.org>
 14  * 
 15  * The file handles registering devices and drivers, then matching them.
 16  * It's the closest we get to a dating agency.
 17  *
 18  * If you're thinking about modifying this file, here are some gotchas to
 19  * bear in mind:
 20  *  - 715/Mirage device paths have a dummy device between Lasi and its children
 21  *  - The EISA adapter may show up as a sibling or child of Wax
 22  *  - Dino has an optionally functional serial port.  If firmware enables it,
 23  *    it shows up as a child of Dino.  If firmware disables it, the buswalk
 24  *    finds it and it shows up as a child of Cujo
 25  *  - Dino has both parisc and pci devices as children
 26  *  - parisc devices are discovered in a random order, including children
 27  *    before parents in some cases.
 28  */
 29 
 30 #include <linux/slab.h>
 31 #include <linux/types.h>
 32 #include <linux/kernel.h>
 33 #include <linux/pci.h>
 34 #include <linux/spinlock.h>
 35 #include <linux/string.h>
 36 #include <linux/export.h>
 37 #include <asm/hardware.h>
 38 #include <asm/io.h>
 39 #include <asm/pdc.h>
 40 #include <asm/parisc-device.h>
 41 
 42 /* See comments in include/asm-parisc/pci.h */
 43 struct hppa_dma_ops *hppa_dma_ops __read_mostly;
 44 EXPORT_SYMBOL(hppa_dma_ops);
 45 
 46 static struct device root = {
 47         .init_name = "parisc",
 48 };
 49 
 50 static inline int check_dev(struct device *dev)
 51 {
 52         if (dev->bus == &parisc_bus_type) {
 53                 struct parisc_device *pdev;
 54                 pdev = to_parisc_device(dev);
 55                 return pdev->id.hw_type != HPHW_FAULTY;
 56         }
 57         return 1;
 58 }
 59 
 60 static struct device *
 61 parse_tree_node(struct device *parent, int index, struct hardware_path *modpath);
 62 
 63 struct recurse_struct {
 64         void * obj;
 65         int (*fn)(struct device *, void *);
 66 };
 67 
 68 static int descend_children(struct device * dev, void * data)
 69 {
 70         struct recurse_struct * recurse_data = (struct recurse_struct *)data;
 71 
 72         if (recurse_data->fn(dev, recurse_data->obj))
 73                 return 1;
 74         else
 75                 return device_for_each_child(dev, recurse_data, descend_children);
 76 }
 77 
 78 /**
 79  *      for_each_padev - Iterate over all devices in the tree
 80  *      @fn:    Function to call for each device.
 81  *      @data:  Data to pass to the called function.
 82  *
 83  *      This performs a depth-first traversal of the tree, calling the
 84  *      function passed for each node.  It calls the function for parents
 85  *      before children.
 86  */
 87 
 88 static int for_each_padev(int (*fn)(struct device *, void *), void * data)
 89 {
 90         struct recurse_struct recurse_data = {
 91                 .obj    = data,
 92                 .fn     = fn,
 93         };
 94         return device_for_each_child(&root, &recurse_data, descend_children);
 95 }
 96 
 97 /**
 98  * match_device - Report whether this driver can handle this device
 99  * @driver: the PA-RISC driver to try
100  * @dev: the PA-RISC device to try
101  */
102 static int match_device(struct parisc_driver *driver, struct parisc_device *dev)
103 {
104         const struct parisc_device_id *ids;
105 
106         for (ids = driver->id_table; ids->sversion; ids++) {
107                 if ((ids->sversion != SVERSION_ANY_ID) &&
108                     (ids->sversion != dev->id.sversion))
109                         continue;
110 
111                 if ((ids->hw_type != HWTYPE_ANY_ID) &&
112                     (ids->hw_type != dev->id.hw_type))
113                         continue;
114 
115                 if ((ids->hversion != HVERSION_ANY_ID) &&
116                     (ids->hversion != dev->id.hversion))
117                         continue;
118 
119                 return 1;
120         }
121         return 0;
122 }
123 
124 static int parisc_driver_probe(struct device *dev)
125 {
126         int rc;
127         struct parisc_device *pa_dev = to_parisc_device(dev);
128         struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
129 
130         rc = pa_drv->probe(pa_dev);
131 
132         if (!rc)
133                 pa_dev->driver = pa_drv;
134 
135         return rc;
136 }
137 
138 static int parisc_driver_remove(struct device *dev)
139 {
140         struct parisc_device *pa_dev = to_parisc_device(dev);
141         struct parisc_driver *pa_drv = to_parisc_driver(dev->driver);
142         if (pa_drv->remove)
143                 pa_drv->remove(pa_dev);
144 
145         return 0;
146 }
147         
148 
149 /**
150  * register_parisc_driver - Register this driver if it can handle a device
151  * @driver: the PA-RISC driver to try
152  */
153 int register_parisc_driver(struct parisc_driver *driver)
154 {
155         /* FIXME: we need this because apparently the sti
156          * driver can be registered twice */
157         if(driver->drv.name) {
158                 printk(KERN_WARNING 
159                        "BUG: skipping previously registered driver %s\n",
160                        driver->name);
161                 return 1;
162         }
163 
164         if (!driver->probe) {
165                 printk(KERN_WARNING 
166                        "BUG: driver %s has no probe routine\n",
167                        driver->name);
168                 return 1;
169         }
170 
171         driver->drv.bus = &parisc_bus_type;
172 
173         /* We install our own probe and remove routines */
174         WARN_ON(driver->drv.probe != NULL);
175         WARN_ON(driver->drv.remove != NULL);
176 
177         driver->drv.name = driver->name;
178 
179         return driver_register(&driver->drv);
180 }
181 EXPORT_SYMBOL(register_parisc_driver);
182 
183 
184 struct match_count {
185         struct parisc_driver * driver;
186         int count;
187 };
188 
189 static int match_and_count(struct device * dev, void * data)
190 {
191         struct match_count * m = data;
192         struct parisc_device * pdev = to_parisc_device(dev);
193 
194         if (check_dev(dev)) {
195                 if (match_device(m->driver, pdev))
196                         m->count++;
197         }
198         return 0;
199 }
200 
201 /**
202  * count_parisc_driver - count # of devices this driver would match
203  * @driver: the PA-RISC driver to try
204  *
205  * Use by IOMMU support to "guess" the right size IOPdir.
206  * Formula is something like memsize/(num_iommu * entry_size).
207  */
208 int count_parisc_driver(struct parisc_driver *driver)
209 {
210         struct match_count m = {
211                 .driver = driver,
212                 .count  = 0,
213         };
214 
215         for_each_padev(match_and_count, &m);
216 
217         return m.count;
218 }
219 
220 
221 
222 /**
223  * unregister_parisc_driver - Unregister this driver from the list of drivers
224  * @driver: the PA-RISC driver to unregister
225  */
226 int unregister_parisc_driver(struct parisc_driver *driver)
227 {
228         driver_unregister(&driver->drv);
229         return 0;
230 }
231 EXPORT_SYMBOL(unregister_parisc_driver);
232 
233 struct find_data {
234         unsigned long hpa;
235         struct parisc_device * dev;
236 };
237 
238 static int find_device(struct device * dev, void * data)
239 {
240         struct parisc_device * pdev = to_parisc_device(dev);
241         struct find_data * d = (struct find_data*)data;
242 
243         if (check_dev(dev)) {
244                 if (pdev->hpa.start == d->hpa) {
245                         d->dev = pdev;
246                         return 1;
247                 }
248         }
249         return 0;
250 }
251 
252 static struct parisc_device *find_device_by_addr(unsigned long hpa)
253 {
254         struct find_data d = {
255                 .hpa    = hpa,
256         };
257         int ret;
258 
259         ret = for_each_padev(find_device, &d);
260         return ret ? d.dev : NULL;
261 }
262 
263 /**
264  * find_pa_parent_type - Find a parent of a specific type
265  * @dev: The device to start searching from
266  * @type: The device type to search for.
267  *
268  * Walks up the device tree looking for a device of the specified type.
269  * If it finds it, it returns it.  If not, it returns NULL.
270  */
271 const struct parisc_device *
272 find_pa_parent_type(const struct parisc_device *padev, int type)
273 {
274         const struct device *dev = &padev->dev;
275         while (dev != &root) {
276                 struct parisc_device *candidate = to_parisc_device(dev);
277                 if (candidate->id.hw_type == type)
278                         return candidate;
279                 dev = dev->parent;
280         }
281 
282         return NULL;
283 }
284 
285 /*
286  * get_node_path fills in @path with the firmware path to the device.
287  * Note that if @node is a parisc device, we don't fill in the 'mod' field.
288  * This is because both callers pass the parent and fill in the mod
289  * themselves.  If @node is a PCI device, we do fill it in, even though this
290  * is inconsistent.
291  */
292 static void get_node_path(struct device *dev, struct hardware_path *path)
293 {
294         int i = 5;
295         memset(&path->bc, -1, 6);
296 
297         if (dev_is_pci(dev)) {
298                 unsigned int devfn = to_pci_dev(dev)->devfn;
299                 path->mod = PCI_FUNC(devfn);
300                 path->bc[i--] = PCI_SLOT(devfn);
301                 dev = dev->parent;
302         }
303 
304         while (dev != &root) {
305                 if (dev_is_pci(dev)) {
306                         unsigned int devfn = to_pci_dev(dev)->devfn;
307                         path->bc[i--] = PCI_SLOT(devfn) | (PCI_FUNC(devfn)<< 5);
308                 } else if (dev->bus == &parisc_bus_type) {
309                         path->bc[i--] = to_parisc_device(dev)->hw_path;
310                 }
311                 dev = dev->parent;
312         }
313 }
314 
315 static char *print_hwpath(struct hardware_path *path, char *output)
316 {
317         int i;
318         for (i = 0; i < 6; i++) {
319                 if (path->bc[i] == -1)
320                         continue;
321                 output += sprintf(output, "%u/", (unsigned char) path->bc[i]);
322         }
323         output += sprintf(output, "%u", (unsigned char) path->mod);
324         return output;
325 }
326 
327 /**
328  * print_pa_hwpath - Returns hardware path for PA devices
329  * dev: The device to return the path for
330  * output: Pointer to a previously-allocated array to place the path in.
331  *
332  * This function fills in the output array with a human-readable path
333  * to a PA device.  This string is compatible with that used by PDC, and
334  * may be printed on the outside of the box.
335  */
336 char *print_pa_hwpath(struct parisc_device *dev, char *output)
337 {
338         struct hardware_path path;
339 
340         get_node_path(dev->dev.parent, &path);
341         path.mod = dev->hw_path;
342         return print_hwpath(&path, output);
343 }
344 EXPORT_SYMBOL(print_pa_hwpath);
345 
346 #if defined(CONFIG_PCI) || defined(CONFIG_ISA)
347 /**
348  * get_pci_node_path - Determines the hardware path for a PCI device
349  * @pdev: The device to return the path for
350  * @path: Pointer to a previously-allocated array to place the path in.
351  *
352  * This function fills in the hardware_path structure with the route to
353  * the specified PCI device.  This structure is suitable for passing to
354  * PDC calls.
355  */
356 void get_pci_node_path(struct pci_dev *pdev, struct hardware_path *path)
357 {
358         get_node_path(&pdev->dev, path);
359 }
360 EXPORT_SYMBOL(get_pci_node_path);
361 
362 /**
363  * print_pci_hwpath - Returns hardware path for PCI devices
364  * dev: The device to return the path for
365  * output: Pointer to a previously-allocated array to place the path in.
366  *
367  * This function fills in the output array with a human-readable path
368  * to a PCI device.  This string is compatible with that used by PDC, and
369  * may be printed on the outside of the box.
370  */
371 char *print_pci_hwpath(struct pci_dev *dev, char *output)
372 {
373         struct hardware_path path;
374 
375         get_pci_node_path(dev, &path);
376         return print_hwpath(&path, output);
377 }
378 EXPORT_SYMBOL(print_pci_hwpath);
379 
380 #endif /* defined(CONFIG_PCI) || defined(CONFIG_ISA) */
381 
382 static void setup_bus_id(struct parisc_device *padev)
383 {
384         struct hardware_path path;
385         char name[28];
386         char *output = name;
387         int i;
388 
389         get_node_path(padev->dev.parent, &path);
390 
391         for (i = 0; i < 6; i++) {
392                 if (path.bc[i] == -1)
393                         continue;
394                 output += sprintf(output, "%u:", (unsigned char) path.bc[i]);
395         }
396         sprintf(output, "%u", (unsigned char) padev->hw_path);
397         dev_set_name(&padev->dev, name);
398 }
399 
400 struct parisc_device * create_tree_node(char id, struct device *parent)
401 {
402         struct parisc_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
403         if (!dev)
404                 return NULL;
405 
406         dev->hw_path = id;
407         dev->id.hw_type = HPHW_FAULTY;
408 
409         dev->dev.parent = parent;
410         setup_bus_id(dev);
411 
412         dev->dev.bus = &parisc_bus_type;
413         dev->dma_mask = 0xffffffffUL;   /* PARISC devices are 32-bit */
414 
415         /* make the generic dma mask a pointer to the parisc one */
416         dev->dev.dma_mask = &dev->dma_mask;
417         dev->dev.coherent_dma_mask = dev->dma_mask;
418         if (device_register(&dev->dev)) {
419                 kfree(dev);
420                 return NULL;
421         }
422 
423         return dev;
424 }
425 
426 struct match_id_data {
427         char id;
428         struct parisc_device * dev;
429 };
430 
431 static int match_by_id(struct device * dev, void * data)
432 {
433         struct parisc_device * pdev = to_parisc_device(dev);
434         struct match_id_data * d = data;
435 
436         if (pdev->hw_path == d->id) {
437                 d->dev = pdev;
438                 return 1;
439         }
440         return 0;
441 }
442 
443 /**
444  * alloc_tree_node - returns a device entry in the iotree
445  * @parent: the parent node in the tree
446  * @id: the element of the module path for this entry
447  *
448  * Checks all the children of @parent for a matching @id.  If none
449  * found, it allocates a new device and returns it.
450  */
451 static struct parisc_device * alloc_tree_node(struct device *parent, char id)
452 {
453         struct match_id_data d = {
454                 .id = id,
455         };
456         if (device_for_each_child(parent, &d, match_by_id))
457                 return d.dev;
458         else
459                 return create_tree_node(id, parent);
460 }
461 
462 static struct parisc_device *create_parisc_device(struct hardware_path *modpath)
463 {
464         int i;
465         struct device *parent = &root;
466         for (i = 0; i < 6; i++) {
467                 if (modpath->bc[i] == -1)
468                         continue;
469                 parent = &alloc_tree_node(parent, modpath->bc[i])->dev;
470         }
471         return alloc_tree_node(parent, modpath->mod);
472 }
473 
474 struct parisc_device *
475 alloc_pa_dev(unsigned long hpa, struct hardware_path *mod_path)
476 {
477         int status;
478         unsigned long bytecnt;
479         u8 iodc_data[32];
480         struct parisc_device *dev;
481         const char *name;
482 
483         /* Check to make sure this device has not already been added - Ryan */
484         if (find_device_by_addr(hpa) != NULL)
485                 return NULL;
486 
487         status = pdc_iodc_read(&bytecnt, hpa, 0, &iodc_data, 32);
488         if (status != PDC_OK)
489                 return NULL;
490 
491         dev = create_parisc_device(mod_path);
492         if (dev->id.hw_type != HPHW_FAULTY) {
493                 printk(KERN_ERR "Two devices have hardware path [%s].  "
494                                 "IODC data for second device: "
495                                 "%02x%02x%02x%02x%02x%02x\n"
496                                 "Rearranging GSC cards sometimes helps\n",
497                         parisc_pathname(dev), iodc_data[0], iodc_data[1],
498                         iodc_data[3], iodc_data[4], iodc_data[5], iodc_data[6]);
499                 return NULL;
500         }
501 
502         dev->id.hw_type = iodc_data[3] & 0x1f;
503         dev->id.hversion = (iodc_data[0] << 4) | ((iodc_data[1] & 0xf0) >> 4);
504         dev->id.hversion_rev = iodc_data[1] & 0x0f;
505         dev->id.sversion = ((iodc_data[4] & 0x0f) << 16) |
506                         (iodc_data[5] << 8) | iodc_data[6];
507         dev->hpa.name = parisc_pathname(dev);
508         dev->hpa.start = hpa;
509         /* This is awkward.  The STI spec says that gfx devices may occupy
510          * 32MB or 64MB.  Unfortunately, we don't know how to tell whether
511          * it's the former or the latter.  Assumptions either way can hurt us.
512          */
513         if (hpa == 0xf4000000 || hpa == 0xf8000000) {
514                 dev->hpa.end = hpa + 0x03ffffff;
515         } else if (hpa == 0xf6000000 || hpa == 0xfa000000) {
516                 dev->hpa.end = hpa + 0x01ffffff;
517         } else {
518                 dev->hpa.end = hpa + 0xfff;
519         }
520         dev->hpa.flags = IORESOURCE_MEM;
521         name = parisc_hardware_description(&dev->id);
522         if (name) {
523                 strlcpy(dev->name, name, sizeof(dev->name));
524         }
525 
526         /* Silently fail things like mouse ports which are subsumed within
527          * the keyboard controller
528          */
529         if ((hpa & 0xfff) == 0 && insert_resource(&iomem_resource, &dev->hpa))
530                 printk("Unable to claim HPA %lx for device %s\n",
531                                 hpa, name);
532 
533         return dev;
534 }
535 
536 static int parisc_generic_match(struct device *dev, struct device_driver *drv)
537 {
538         return match_device(to_parisc_driver(drv), to_parisc_device(dev));
539 }
540 
541 static ssize_t make_modalias(struct device *dev, char *buf)
542 {
543         const struct parisc_device *padev = to_parisc_device(dev);
544         const struct parisc_device_id *id = &padev->id;
545 
546         return sprintf(buf, "parisc:t%02Xhv%04Xrev%02Xsv%08X\n",
547                 (u8)id->hw_type, (u16)id->hversion, (u8)id->hversion_rev,
548                 (u32)id->sversion);
549 }
550 
551 static int parisc_uevent(struct device *dev, struct kobj_uevent_env *env)
552 {
553         const struct parisc_device *padev;
554         char modalias[40];
555 
556         if (!dev)
557                 return -ENODEV;
558 
559         padev = to_parisc_device(dev);
560         if (!padev)
561                 return -ENODEV;
562 
563         if (add_uevent_var(env, "PARISC_NAME=%s", padev->name))
564                 return -ENOMEM;
565 
566         make_modalias(dev, modalias);
567         if (add_uevent_var(env, "MODALIAS=%s", modalias))
568                 return -ENOMEM;
569 
570         return 0;
571 }
572 
573 #define pa_dev_attr(name, field, format_string)                         \
574 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, char *buf)                \
575 {                                                                       \
576         struct parisc_device *padev = to_parisc_device(dev);            \
577         return sprintf(buf, format_string, padev->field);               \
578 }
579 
580 #define pa_dev_attr_id(field, format) pa_dev_attr(field, id.field, format)
581 
582 pa_dev_attr(irq, irq, "%u\n");
583 pa_dev_attr_id(hw_type, "0x%02x\n");
584 pa_dev_attr(rev, id.hversion_rev, "0x%x\n");
585 pa_dev_attr_id(hversion, "0x%03x\n");
586 pa_dev_attr_id(sversion, "0x%05x\n");
587 
588 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
589 {
590         return make_modalias(dev, buf);
591 }
592 
593 static struct device_attribute parisc_device_attrs[] = {
594         __ATTR_RO(irq),
595         __ATTR_RO(hw_type),
596         __ATTR_RO(rev),
597         __ATTR_RO(hversion),
598         __ATTR_RO(sversion),
599         __ATTR_RO(modalias),
600         __ATTR_NULL,
601 };
602 
603 struct bus_type parisc_bus_type = {
604         .name = "parisc",
605         .match = parisc_generic_match,
606         .uevent = parisc_uevent,
607         .dev_attrs = parisc_device_attrs,
608         .probe = parisc_driver_probe,
609         .remove = parisc_driver_remove,
610 };
611 
612 /**
613  * register_parisc_device - Locate a driver to manage this device.
614  * @dev: The parisc device.
615  *
616  * Search the driver list for a driver that is willing to manage
617  * this device.
618  */
619 int register_parisc_device(struct parisc_device *dev)
620 {
621         if (!dev)
622                 return 0;
623 
624         if (dev->driver)
625                 return 1;
626 
627         return 0;
628 }
629 
630 /**
631  * match_pci_device - Matches a pci device against a given hardware path
632  * entry.
633  * @dev: the generic device (known to be contained by a pci_dev).
634  * @index: the current BC index
635  * @modpath: the hardware path.
636  * @return: true if the device matches the hardware path.
637  */
638 static int match_pci_device(struct device *dev, int index,
639                 struct hardware_path *modpath)
640 {
641         struct pci_dev *pdev = to_pci_dev(dev);
642         int id;
643 
644         if (index == 5) {
645                 /* we are at the end of the path, and on the actual device */
646                 unsigned int devfn = pdev->devfn;
647                 return ((modpath->bc[5] == PCI_SLOT(devfn)) &&
648                                         (modpath->mod == PCI_FUNC(devfn)));
649         }
650 
651         id = PCI_SLOT(pdev->devfn) | (PCI_FUNC(pdev->devfn) << 5);
652         return (modpath->bc[index] == id);
653 }
654 
655 /**
656  * match_parisc_device - Matches a parisc device against a given hardware
657  * path entry.
658  * @dev: the generic device (known to be contained by a parisc_device).
659  * @index: the current BC index
660  * @modpath: the hardware path.
661  * @return: true if the device matches the hardware path.
662  */
663 static int match_parisc_device(struct device *dev, int index,
664                 struct hardware_path *modpath)
665 {
666         struct parisc_device *curr = to_parisc_device(dev);
667         char id = (index == 6) ? modpath->mod : modpath->bc[index];
668 
669         return (curr->hw_path == id);
670 }
671 
672 struct parse_tree_data {
673         int index;
674         struct hardware_path * modpath;
675         struct device * dev;
676 };
677 
678 static int check_parent(struct device * dev, void * data)
679 {
680         struct parse_tree_data * d = data;
681 
682         if (check_dev(dev)) {
683                 if (dev->bus == &parisc_bus_type) {
684                         if (match_parisc_device(dev, d->index, d->modpath))
685                                 d->dev = dev;
686                 } else if (dev_is_pci(dev)) {
687                         if (match_pci_device(dev, d->index, d->modpath))
688                                 d->dev = dev;
689                 } else if (dev->bus == NULL) {
690                         /* we are on a bus bridge */
691                         struct device *new = parse_tree_node(dev, d->index, d->modpath);
692                         if (new)
693                                 d->dev = new;
694                 }
695         }
696         return d->dev != NULL;
697 }
698 
699 /**
700  * parse_tree_node - returns a device entry in the iotree
701  * @parent: the parent node in the tree
702  * @index: the current BC index
703  * @modpath: the hardware_path struct to match a device against
704  * @return: The corresponding device if found, NULL otherwise.
705  *
706  * Checks all the children of @parent for a matching @id.  If none
707  * found, it returns NULL.
708  */
709 static struct device *
710 parse_tree_node(struct device *parent, int index, struct hardware_path *modpath)
711 {
712         struct parse_tree_data d = {
713                 .index          = index,
714                 .modpath        = modpath,
715         };
716 
717         struct recurse_struct recurse_data = {
718                 .obj    = &d,
719                 .fn     = check_parent,
720         };
721 
722         if (device_for_each_child(parent, &recurse_data, descend_children))
723                 /* nothing */;
724 
725         return d.dev;
726 }
727 
728 /**
729  * hwpath_to_device - Finds the generic device corresponding to a given hardware path.
730  * @modpath: the hardware path.
731  * @return: The target device, NULL if not found.
732  */
733 struct device *hwpath_to_device(struct hardware_path *modpath)
734 {
735         int i;
736         struct device *parent = &root;
737         for (i = 0; i < 6; i++) {
738                 if (modpath->bc[i] == -1)
739                         continue;
740                 parent = parse_tree_node(parent, i, modpath);
741                 if (!parent)
742                         return NULL;
743         }
744         if (dev_is_pci(parent)) /* pci devices already parse MOD */
745                 return parent;
746         else
747                 return parse_tree_node(parent, 6, modpath);
748 }
749 EXPORT_SYMBOL(hwpath_to_device);
750 
751 /**
752  * device_to_hwpath - Populates the hwpath corresponding to the given device.
753  * @param dev the target device
754  * @param path pointer to a previously allocated hwpath struct to be filled in
755  */
756 void device_to_hwpath(struct device *dev, struct hardware_path *path)
757 {
758         struct parisc_device *padev;
759         if (dev->bus == &parisc_bus_type) {
760                 padev = to_parisc_device(dev);
761                 get_node_path(dev->parent, path);
762                 path->mod = padev->hw_path;
763         } else if (dev_is_pci(dev)) {
764                 get_node_path(dev, path);
765         }
766 }
767 EXPORT_SYMBOL(device_to_hwpath);
768 
769 #define BC_PORT_MASK 0x8
770 #define BC_LOWER_PORT 0x8
771 
772 #define BUS_CONVERTER(dev) \
773         ((dev->id.hw_type == HPHW_IOA) || (dev->id.hw_type == HPHW_BCPORT))
774 
775 #define IS_LOWER_PORT(dev) \
776         ((gsc_readl(dev->hpa.start + offsetof(struct bc_module, io_status)) \
777                 & BC_PORT_MASK) == BC_LOWER_PORT)
778 
779 #define MAX_NATIVE_DEVICES 64
780 #define NATIVE_DEVICE_OFFSET 0x1000
781 
782 #define FLEX_MASK       F_EXTEND(0xfffc0000)
783 #define IO_IO_LOW       offsetof(struct bc_module, io_io_low)
784 #define IO_IO_HIGH      offsetof(struct bc_module, io_io_high)
785 #define READ_IO_IO_LOW(dev)  (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_LOW)
786 #define READ_IO_IO_HIGH(dev) (unsigned long)(signed int)gsc_readl(dev->hpa.start + IO_IO_HIGH)
787 
788 static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
789                             struct device *parent);
790 
791 void walk_lower_bus(struct parisc_device *dev)
792 {
793         unsigned long io_io_low, io_io_high;
794 
795         if (!BUS_CONVERTER(dev) || IS_LOWER_PORT(dev))
796                 return;
797 
798         if (dev->id.hw_type == HPHW_IOA) {
799                 io_io_low = (unsigned long)(signed int)(READ_IO_IO_LOW(dev) << 16);
800                 io_io_high = io_io_low + MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET;
801         } else {
802                 io_io_low = (READ_IO_IO_LOW(dev) + ~FLEX_MASK) & FLEX_MASK;
803                 io_io_high = (READ_IO_IO_HIGH(dev)+ ~FLEX_MASK) & FLEX_MASK;
804         }
805 
806         walk_native_bus(io_io_low, io_io_high, &dev->dev);
807 }
808 
809 /**
810  * walk_native_bus -- Probe a bus for devices
811  * @io_io_low: Base address of this bus.
812  * @io_io_high: Last address of this bus.
813  * @parent: The parent bus device.
814  * 
815  * A native bus (eg Runway or GSC) may have up to 64 devices on it,
816  * spaced at intervals of 0x1000 bytes.  PDC may not inform us of these
817  * devices, so we have to probe for them.  Unfortunately, we may find
818  * devices which are not physically connected (such as extra serial &
819  * keyboard ports).  This problem is not yet solved.
820  */
821 static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
822                             struct device *parent)
823 {
824         int i, devices_found = 0;
825         unsigned long hpa = io_io_low;
826         struct hardware_path path;
827 
828         get_node_path(parent, &path);
829         do {
830                 for(i = 0; i < MAX_NATIVE_DEVICES; i++, hpa += NATIVE_DEVICE_OFFSET) {
831                         struct parisc_device *dev;
832 
833                         /* Was the device already added by Firmware? */
834                         dev = find_device_by_addr(hpa);
835                         if (!dev) {
836                                 path.mod = i;
837                                 dev = alloc_pa_dev(hpa, &path);
838                                 if (!dev)
839                                         continue;
840 
841                                 register_parisc_device(dev);
842                                 devices_found++;
843                         }
844                         walk_lower_bus(dev);
845                 }
846         } while(!devices_found && hpa < io_io_high);
847 }
848 
849 #define CENTRAL_BUS_ADDR F_EXTEND(0xfff80000)
850 
851 /**
852  * walk_central_bus - Find devices attached to the central bus
853  *
854  * PDC doesn't tell us about all devices in the system.  This routine
855  * finds devices connected to the central bus.
856  */
857 void walk_central_bus(void)
858 {
859         walk_native_bus(CENTRAL_BUS_ADDR,
860                         CENTRAL_BUS_ADDR + (MAX_NATIVE_DEVICES * NATIVE_DEVICE_OFFSET),
861                         &root);
862 }
863 
864 static void print_parisc_device(struct parisc_device *dev)
865 {
866         char hw_path[64];
867         static int count;
868 
869         print_pa_hwpath(dev, hw_path);
870         printk(KERN_INFO "%d. %s at 0x%p [%s] { %d, 0x%x, 0x%.3x, 0x%.5x }",
871                 ++count, dev->name, (void*) dev->hpa.start, hw_path, dev->id.hw_type,
872                 dev->id.hversion_rev, dev->id.hversion, dev->id.sversion);
873 
874         if (dev->num_addrs) {
875                 int k;
876                 printk(", additional addresses: ");
877                 for (k = 0; k < dev->num_addrs; k++)
878                         printk("0x%lx ", dev->addr[k]);
879         }
880         printk("\n");
881 }
882 
883 /**
884  * init_parisc_bus - Some preparation to be done before inventory
885  */
886 void init_parisc_bus(void)
887 {
888         if (bus_register(&parisc_bus_type))
889                 panic("Could not register PA-RISC bus type\n");
890         if (device_register(&root))
891                 panic("Could not register PA-RISC root device\n");
892         get_device(&root);
893 }
894 
895 
896 static int print_one_device(struct device * dev, void * data)
897 {
898         struct parisc_device * pdev = to_parisc_device(dev);
899 
900         if (check_dev(dev))
901                 print_parisc_device(pdev);
902         return 0;
903 }
904 
905 /**
906  * print_parisc_devices - Print out a list of devices found in this system
907  */
908 void print_parisc_devices(void)
909 {
910         for_each_padev(print_one_device, NULL);
911 }
912 

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