]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/pci/hotplug/rpaphp_pci.c
d8305a935aab12d2471dd8de7253ba21e19b4136
[linux-2.6.git] / drivers / pci / hotplug / rpaphp_pci.c
1 /*
2  * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
3  * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
4  *
5  * All rights reserved.
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or (at
10  * your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15  * NON INFRINGEMENT.  See the GNU General Public License for more
16  * details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  * Send feedback to <lxie@us.ibm.com>
23  *
24  */
25 #include <linux/pci.h>
26 #include <asm/pci-bridge.h>
27 #include <asm/rtas.h>
28 #include <asm/machdep.h>
29 #include "../pci.h"             /* for pci_add_new_bus */
30
31 #include "rpaphp.h"
32
33 struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn)
34 {
35         struct pci_dev *dev = NULL;
36         char bus_id[BUS_ID_SIZE];
37
38         sprintf(bus_id, "%04x:%02x:%02x.%d", dn->phb->global_number,
39                 dn->busno, PCI_SLOT(dn->devfn), PCI_FUNC(dn->devfn));
40         for_each_pci_dev(dev) {
41                 if (!strcmp(pci_name(dev), bus_id)) {
42                         break;
43                 }
44         }
45         return dev;
46 }
47
48 EXPORT_SYMBOL_GPL(rpaphp_find_pci_dev);
49
50 int rpaphp_claim_resource(struct pci_dev *dev, int resource)
51 {
52         struct resource *res = &dev->resource[resource];
53         struct resource *root = pci_find_parent_resource(dev, res);
54         char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
55         int err = -EINVAL;
56
57         if (root != NULL) {
58                 err = request_resource(root, res);
59         }
60
61         if (err) {
62                 err("PCI: %s region %d of %s %s [%lx:%lx]\n",
63                     root ? "Address space collision on" :
64                     "No parent found for",
65                     resource, dtype, pci_name(dev), res->start, res->end);
66         }
67         return err;
68 }
69
70 EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
71
72 static struct pci_dev *rpaphp_find_bridge_pdev(struct slot *slot)
73 {
74         return rpaphp_find_pci_dev(slot->dn);
75 }
76
77 static int rpaphp_get_sensor_state(struct slot *slot, int *state)
78 {
79         int rc;
80         int setlevel;
81
82         rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
83
84         if (rc < 0) {
85                 if (rc == -EFAULT || rc == -EEXIST) {
86                         dbg("%s: slot must be power up to get sensor-state\n",
87                             __FUNCTION__);
88
89                         /* some slots have to be powered up 
90                          * before get-sensor will succeed.
91                          */
92                         rc = rtas_set_power_level(slot->power_domain, POWER_ON,
93                                                   &setlevel);
94                         if (rc < 0) {
95                                 dbg("%s: power on slot[%s] failed rc=%d.\n",
96                                     __FUNCTION__, slot->name, rc);
97                         } else {
98                                 rc = rtas_get_sensor(DR_ENTITY_SENSE,
99                                                      slot->index, state);
100                         }
101                 } else if (rc == -ENODEV)
102                         info("%s: slot is unusable\n", __FUNCTION__);
103                 else
104                         err("%s failed to get sensor state\n", __FUNCTION__);
105         }
106         return rc;
107 }
108
109 /**
110  * get_pci_adapter_status - get the status of a slot
111  * 
112  * 0-- slot is empty
113  * 1-- adapter is configured
114  * 2-- adapter is not configured
115  * 3-- not valid
116  */
117 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
118 {
119         int state, rc;
120         struct device_node *child_dn;
121         struct pci_dev *child_dev = NULL;
122
123         *value = NOT_VALID;
124         rc = rpaphp_get_sensor_state(slot, &state);
125         if (rc)
126                 goto exit;
127
128         if ((state == EMPTY) || (slot->type == PHB)) {
129                 dbg("slot is empty\n");
130                 *value = EMPTY;
131         }
132         else if (state == PRESENT) {
133                 if (!is_init) {
134                         /* at run-time slot->state can be changed by */
135                         /* config/unconfig adapter */
136                         *value = slot->state;
137                 } else {
138                         child_dn = slot->dn->child;
139                         if (child_dn)
140                                 child_dev = rpaphp_find_pci_dev(child_dn);
141
142                         if (child_dev)
143                                 *value = CONFIGURED;
144                         else if (!child_dn)
145                                 dbg("%s: %s is not valid OFDT node\n",
146                                     __FUNCTION__, slot->dn->full_name);
147                         else {
148                                 err("%s: can't find pdev of adapter in slot[%s]\n", 
149                                         __FUNCTION__, slot->dn->full_name);
150                                 *value = NOT_CONFIGURED;
151                         }
152                 }
153         }
154 exit:
155         return rc;
156 }
157
158 /* Must be called before pci_bus_add_devices */
159 static void 
160 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
161 {
162         struct pci_dev *dev;
163
164         list_for_each_entry(dev, &bus->devices, bus_list) {
165                 /*
166                  * Skip already-present devices (which are on the
167                  * global device list.)
168                  */
169                 if (list_empty(&dev->global_list)) {
170                         int i;
171                         
172                         /* Need to setup IOMMU tables */
173                         ppc_md.iommu_dev_setup(dev);
174
175                         if(fix_bus)
176                                 pcibios_fixup_device_resources(dev, bus);
177                         pci_read_irq_line(dev);
178                         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
179                                 struct resource *r = &dev->resource[i];
180
181                                 if (r->parent || !r->start || !r->flags)
182                                         continue;
183                                 rpaphp_claim_resource(dev, i);
184                         }
185                 }
186         }
187 }
188
189 static int rpaphp_pci_config_bridge(struct pci_dev *dev);
190
191 /*****************************************************************************
192  rpaphp_pci_config_slot() will  configure all devices under the 
193  given slot->dn and return the the first pci_dev.
194  *****************************************************************************/
195 static struct pci_dev *
196 rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus)
197 {
198         struct device_node *eads_first_child = dn->child;
199         struct pci_dev *dev = NULL;
200         int num;
201         
202         dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
203
204         if (eads_first_child) {
205                 /* pci_scan_slot should find all children of EADs */
206                 num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0));
207                 if (num) {
208                         rpaphp_fixup_new_pci_devices(bus, 1); 
209                         pci_bus_add_devices(bus);
210                 }
211                 dev = rpaphp_find_pci_dev(eads_first_child);
212                 if (!dev) {
213                         err("No new device found\n");
214                         return NULL;
215                 }
216                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) 
217                         rpaphp_pci_config_bridge(dev);
218         }
219         return dev;
220 }
221
222 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
223 {
224         u8 sec_busno;
225         struct pci_bus *child_bus;
226         struct pci_dev *child_dev;
227
228         dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
229
230         /* get busno of downstream bus */
231         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
232                 
233         /* add to children of PCI bridge dev->bus */
234         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
235         if (!child_bus) {
236                 err("%s: could not add second bus\n", __FUNCTION__);
237                 return -EIO;
238         }
239         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
240         /* do pci_scan_child_bus */
241         pci_scan_child_bus(child_bus);
242
243         list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
244                 eeh_add_device_late(child_dev);
245         }
246
247          /* fixup new pci devices without touching bus struct */
248         rpaphp_fixup_new_pci_devices(child_bus, 0);
249
250         /* Make the discovered devices available */
251         pci_bus_add_devices(child_bus);
252         return 0;
253 }
254
255 static void enable_eeh(struct device_node *dn)
256 {
257         struct device_node *sib;
258
259         for (sib = dn->child; sib; sib = sib->sibling) 
260                 enable_eeh(sib);
261         eeh_add_device_early(dn);
262         return;
263         
264 }
265
266 static void print_slot_pci_funcs(struct slot *slot)
267 {
268         struct pci_dev *dev;
269
270         if (slot->dev_type == PCI_DEV) {
271                 dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->name);
272                 list_for_each_entry (dev, slot->dev.pci_devs, bus_list)
273                         dbg("\t%s\n", pci_name(dev));
274         }
275         return;
276 }
277
278 static int rpaphp_config_pci_adapter(struct slot *slot)
279 {
280         struct pci_bus *pci_bus;
281         struct pci_dev *dev;
282         int rc = -ENODEV;
283
284         dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
285
286         if (slot->bridge) {
287
288                 pci_bus = slot->bridge->subordinate;
289                 if (!pci_bus) {
290                         err("%s: can't find bus structure\n", __FUNCTION__);
291                         goto exit;
292                 }
293                 enable_eeh(slot->dn);
294                 dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
295                 if (!dev) {
296                         err("%s: can't find any devices.\n", __FUNCTION__);
297                         goto exit;
298                 }
299                 print_slot_pci_funcs(slot);
300                 rc = 0;
301         } else {
302                 /* slot is not enabled */
303                 err("slot doesn't have pci_dev structure\n");
304         }
305 exit:
306         dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
307         return rc;
308 }
309
310 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
311 {
312         eeh_remove_device(dev);
313         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
314                 struct pci_bus *bus = dev->subordinate;
315                 struct list_head *ln;
316                 if (!bus)
317                         return; 
318                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
319                         struct pci_dev *pdev = pci_dev_b(ln);
320                         if (pdev)
321                                 rpaphp_eeh_remove_bus_device(pdev);
322                 }
323
324         }
325         return;
326 }
327
328 int rpaphp_unconfig_pci_adapter(struct slot *slot)
329 {
330         struct pci_dev *dev;
331         int retval = 0;
332
333         list_for_each_entry(dev, slot->dev.pci_devs, bus_list)
334                 rpaphp_eeh_remove_bus_device(dev);
335
336         pci_remove_behind_bridge(slot->bridge);
337         slot->state = NOT_CONFIGURED;
338         info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
339              slot->name);
340         return retval;
341 }
342
343 static int setup_pci_hotplug_slot_info(struct slot *slot)
344 {
345         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
346             __FUNCTION__);
347         rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
348         rpaphp_get_pci_adapter_status(slot, 1,
349                                       &slot->hotplug_slot->info->
350                                       adapter_status);
351         if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
352                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
353                     __FUNCTION__, slot->dn->full_name);
354                 return -EINVAL;
355         }
356         return 0;
357 }
358
359 static int set_phb_slot_name(struct slot *slot)
360 {
361         struct device_node *dn;
362         struct pci_controller *phb;
363         struct pci_bus *bus;
364
365         dn = slot->dn;
366         if (!dn) {
367                 return -EINVAL;
368         }
369         phb = dn->phb;
370         if (!phb) {
371                 return -EINVAL;
372         }
373         bus = phb->bus;
374         if (!bus) {
375                 return -EINVAL;
376         }
377
378         sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus),
379                         bus->number, 0, 0);
380         return 0;
381 }
382
383 static int setup_pci_slot(struct slot *slot)
384 {
385         struct pci_bus *bus;
386         int rc;
387
388         if (slot->type == PHB) {
389                 rc = set_phb_slot_name(slot);
390                 if (rc < 0) {
391                         err("%s: failed to set phb slot name\n", __FUNCTION__);
392                         goto exit_rc;
393                 }
394         } else {
395                 slot->bridge = rpaphp_find_bridge_pdev(slot);
396                 if (!slot->bridge) {
397                         /* slot being added doesn't have pci_dev yet */
398                         err("%s: no pci_dev for bridge dn %s\n",
399                                         __FUNCTION__, slot->name);
400                         goto exit_rc;
401                 }
402
403                 bus = slot->bridge->subordinate;
404                 if (!bus)
405                         goto exit_rc;
406                 slot->dev.pci_devs = &bus->devices;
407
408                 dbg("%s set slot->name to %s\n",  __FUNCTION__,
409                                 pci_name(slot->bridge));
410                 strcpy(slot->name, pci_name(slot->bridge));
411         }
412
413         /* find slot's pci_dev if it's not empty */
414         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
415                 slot->state = EMPTY;    /* slot is empty */
416         } else {
417                 /* slot is occupied */
418                 if (!(slot->dn->child)) {
419                         /* non-empty slot has to have child */
420                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 
421                                 __FUNCTION__, slot->name);
422                         goto exit_rc;
423                 }
424
425                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
426                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",  
427                                 __FUNCTION__, slot->name);
428                         if (rpaphp_config_pci_adapter(slot)) {
429                                 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
430                                 goto exit_rc;           
431                         }
432
433                 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
434                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
435                                 __FUNCTION__, slot->name);
436                         goto exit_rc;
437                 }
438                 print_slot_pci_funcs(slot);
439                 if (!list_empty(slot->dev.pci_devs)) {
440                         slot->state = CONFIGURED;
441                 } else {
442                         /* DLPAR add as opposed to 
443                          * boot time */
444                         slot->state = NOT_CONFIGURED;
445                 }
446         }
447         return 0;
448 exit_rc:
449         dealloc_slot_struct(slot);
450         return -EINVAL;
451 }
452
453 int register_pci_slot(struct slot *slot)
454 {
455         int rc = -EINVAL;
456
457         slot->dev_type = PCI_DEV;
458         if ((slot->type == EMBEDDED) || (slot->type == PHB))
459                 slot->removable = 0;
460         else
461                 slot->removable = 1;
462         if (setup_pci_hotplug_slot_info(slot))
463                 goto exit_rc;
464         if (setup_pci_slot(slot))
465                 goto exit_rc;
466         rc = register_slot(slot);
467 exit_rc:
468         return rc;
469 }
470
471 int rpaphp_enable_pci_slot(struct slot *slot)
472 {
473         int retval = 0, state;
474
475         retval = rpaphp_get_sensor_state(slot, &state);
476         if (retval)
477                 goto exit;
478         dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
479         /* if slot is not empty, enable the adapter */
480         if (state == PRESENT) {
481                 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
482                 retval = rpaphp_config_pci_adapter(slot);
483                 if (!retval) {
484                         slot->state = CONFIGURED;
485                         dbg("%s: PCI devices in slot[%s] has been configured\n", 
486                                 __FUNCTION__, slot->name);
487                 } else {
488                         slot->state = NOT_CONFIGURED;
489                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
490                             __FUNCTION__, slot->name);
491                 }
492         } else if (state == EMPTY) {
493                 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
494                 slot->state = EMPTY;
495         } else {
496                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
497                     slot->name);
498                 slot->state = NOT_VALID;
499                 retval = -EINVAL;
500         }
501 exit:
502         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
503         return retval;
504 }
505
506 struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev)
507 {
508         struct list_head        *tmp, *n;
509         struct slot             *slot;
510
511         list_for_each_safe(tmp, n, &rpaphp_slot_head) {
512                 struct pci_bus *bus;
513                 struct list_head *ln;
514
515                 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
516                 if (slot->bridge == NULL) {
517                         if (slot->dev_type == PCI_DEV) {
518                                 printk(KERN_WARNING "PCI slot missing bridge %s %s \n", 
519                                                     slot->name, slot->location);
520                         }
521                         continue;
522                 }
523
524                 bus = slot->bridge->subordinate;
525                 if (!bus) {
526                         continue;  /* should never happen? */
527                 }
528                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
529                                 struct pci_dev *pdev = pci_dev_b(ln);
530                                 if (pdev == dev)
531                                         return slot->hotplug_slot;
532                 }
533         }
534
535         return NULL;
536 }
537
538 EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot);