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[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         u8 sec_busno;
192         struct pci_bus *child_bus;
193         struct pci_dev *child_dev;
194
195         dbg("Enter %s:  BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
196
197         /* get busno of downstream bus */
198         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
199                 
200         /* add to children of PCI bridge dev->bus */
201         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
202         if (!child_bus) {
203                 err("%s: could not add second bus\n", __FUNCTION__);
204                 return -EIO;
205         }
206         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
207         /* do pci_scan_child_bus */
208         pci_scan_child_bus(child_bus);
209
210         list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
211                 eeh_add_device_late(child_dev);
212         }
213
214          /* fixup new pci devices without touching bus struct */
215         rpaphp_fixup_new_pci_devices(child_bus, 0);
216
217         /* Make the discovered devices available */
218         pci_bus_add_devices(child_bus);
219         return 0;
220 }
221
222 /*****************************************************************************
223  rpaphp_pci_config_slot() will  configure all devices under the
224  given slot->dn and return the the first pci_dev.
225  *****************************************************************************/
226 static struct pci_dev *
227 rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus)
228 {
229         struct device_node *eads_first_child = dn->child;
230         struct pci_dev *dev = NULL;
231         int num;
232
233         dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
234
235         if (eads_first_child) {
236                 /* pci_scan_slot should find all children of EADs */
237                 num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0));
238                 if (num) {
239                         rpaphp_fixup_new_pci_devices(bus, 1);
240                         pci_bus_add_devices(bus);
241                 }
242                 dev = rpaphp_find_pci_dev(eads_first_child);
243                 if (!dev) {
244                         err("No new device found\n");
245                         return NULL;
246                 }
247                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
248                         rpaphp_pci_config_bridge(dev);
249         }
250         return dev;
251 }
252
253 static void enable_eeh(struct device_node *dn)
254 {
255         struct device_node *sib;
256
257         for (sib = dn->child; sib; sib = sib->sibling) 
258                 enable_eeh(sib);
259         eeh_add_device_early(dn);
260         return;
261         
262 }
263
264 static void print_slot_pci_funcs(struct slot *slot)
265 {
266         struct pci_dev *dev;
267
268         if (slot->dev_type == PCI_DEV) {
269                 dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, slot->name);
270                 list_for_each_entry (dev, slot->dev.pci_devs, bus_list)
271                         dbg("\t%s\n", pci_name(dev));
272         }
273         return;
274 }
275
276 static int rpaphp_config_pci_adapter(struct slot *slot)
277 {
278         struct pci_bus *pci_bus;
279         struct pci_dev *dev;
280         int rc = -ENODEV;
281
282         dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
283
284         if (slot->bridge) {
285
286                 pci_bus = slot->bridge->subordinate;
287                 if (!pci_bus) {
288                         err("%s: can't find bus structure\n", __FUNCTION__);
289                         goto exit;
290                 }
291                 enable_eeh(slot->dn);
292                 dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
293                 if (!dev) {
294                         err("%s: can't find any devices.\n", __FUNCTION__);
295                         goto exit;
296                 }
297                 print_slot_pci_funcs(slot);
298                 rc = 0;
299         } else {
300                 /* slot is not enabled */
301                 err("slot doesn't have pci_dev structure\n");
302         }
303 exit:
304         dbg("Exit %s:  rc=%d\n", __FUNCTION__, rc);
305         return rc;
306 }
307
308 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
309 {
310         eeh_remove_device(dev);
311         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
312                 struct pci_bus *bus = dev->subordinate;
313                 struct list_head *ln;
314                 if (!bus)
315                         return; 
316                 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
317                         struct pci_dev *pdev = pci_dev_b(ln);
318                         if (pdev)
319                                 rpaphp_eeh_remove_bus_device(pdev);
320                 }
321
322         }
323         return;
324 }
325
326 int rpaphp_unconfig_pci_adapter(struct slot *slot)
327 {
328         struct pci_dev *dev;
329         int retval = 0;
330
331         list_for_each_entry(dev, slot->dev.pci_devs, bus_list)
332                 rpaphp_eeh_remove_bus_device(dev);
333
334         pci_remove_behind_bridge(slot->bridge);
335         slot->state = NOT_CONFIGURED;
336         info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
337              slot->name);
338         return retval;
339 }
340
341 static int setup_pci_hotplug_slot_info(struct slot *slot)
342 {
343         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
344             __FUNCTION__);
345         rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
346         rpaphp_get_pci_adapter_status(slot, 1,
347                                       &slot->hotplug_slot->info->
348                                       adapter_status);
349         if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
350                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
351                     __FUNCTION__, slot->dn->full_name);
352                 return -EINVAL;
353         }
354         return 0;
355 }
356
357 static int set_phb_slot_name(struct slot *slot)
358 {
359         struct device_node *dn;
360         struct pci_controller *phb;
361         struct pci_bus *bus;
362
363         dn = slot->dn;
364         if (!dn) {
365                 return -EINVAL;
366         }
367         phb = dn->phb;
368         if (!phb) {
369                 return -EINVAL;
370         }
371         bus = phb->bus;
372         if (!bus) {
373                 return -EINVAL;
374         }
375
376         sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus),
377                         bus->number, 0, 0);
378         return 0;
379 }
380
381 static int setup_pci_slot(struct slot *slot)
382 {
383         struct pci_bus *bus;
384         int rc;
385
386         if (slot->type == PHB) {
387                 rc = set_phb_slot_name(slot);
388                 if (rc < 0) {
389                         err("%s: failed to set phb slot name\n", __FUNCTION__);
390                         goto exit_rc;
391                 }
392         } else {
393                 slot->bridge = rpaphp_find_bridge_pdev(slot);
394                 if (!slot->bridge) {
395                         /* slot being added doesn't have pci_dev yet */
396                         err("%s: no pci_dev for bridge dn %s\n",
397                                         __FUNCTION__, slot->name);
398                         goto exit_rc;
399                 }
400
401                 bus = slot->bridge->subordinate;
402                 if (!bus)
403                         goto exit_rc;
404                 slot->dev.pci_devs = &bus->devices;
405
406                 dbg("%s set slot->name to %s\n",  __FUNCTION__,
407                                 pci_name(slot->bridge));
408                 strcpy(slot->name, pci_name(slot->bridge));
409         }
410
411         /* find slot's pci_dev if it's not empty */
412         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
413                 slot->state = EMPTY;    /* slot is empty */
414         } else {
415                 /* slot is occupied */
416                 if (!(slot->dn->child)) {
417                         /* non-empty slot has to have child */
418                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 
419                                 __FUNCTION__, slot->name);
420                         goto exit_rc;
421                 }
422
423                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
424                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",  
425                                 __FUNCTION__, slot->name);
426                         if (rpaphp_config_pci_adapter(slot)) {
427                                 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
428                                 goto exit_rc;           
429                         }
430
431                 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
432                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
433                                 __FUNCTION__, slot->name);
434                         goto exit_rc;
435                 }
436                 print_slot_pci_funcs(slot);
437                 if (!list_empty(slot->dev.pci_devs)) {
438                         slot->state = CONFIGURED;
439                 } else {
440                         /* DLPAR add as opposed to 
441                          * boot time */
442                         slot->state = NOT_CONFIGURED;
443                 }
444         }
445         return 0;
446 exit_rc:
447         dealloc_slot_struct(slot);
448         return -EINVAL;
449 }
450
451 int register_pci_slot(struct slot *slot)
452 {
453         int rc = -EINVAL;
454
455         slot->dev_type = PCI_DEV;
456         if ((slot->type == EMBEDDED) || (slot->type == PHB))
457                 slot->removable = 0;
458         else
459                 slot->removable = 1;
460         if (setup_pci_hotplug_slot_info(slot))
461                 goto exit_rc;
462         if (setup_pci_slot(slot))
463                 goto exit_rc;
464         rc = register_slot(slot);
465 exit_rc:
466         return rc;
467 }
468
469 int rpaphp_enable_pci_slot(struct slot *slot)
470 {
471         int retval = 0, state;
472
473         retval = rpaphp_get_sensor_state(slot, &state);
474         if (retval)
475                 goto exit;
476         dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
477         /* if slot is not empty, enable the adapter */
478         if (state == PRESENT) {
479                 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
480                 retval = rpaphp_config_pci_adapter(slot);
481                 if (!retval) {
482                         slot->state = CONFIGURED;
483                         dbg("%s: PCI devices in slot[%s] has been configured\n", 
484                                 __FUNCTION__, slot->name);
485                 } else {
486                         slot->state = NOT_CONFIGURED;
487                         dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
488                             __FUNCTION__, slot->name);
489                 }
490         } else if (state == EMPTY) {
491                 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
492                 slot->state = EMPTY;
493         } else {
494                 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
495                     slot->name);
496                 slot->state = NOT_VALID;
497                 retval = -EINVAL;
498         }
499 exit:
500         dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
501         return retval;
502 }