2 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
3 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
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.
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
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.
22 * Send feedback to <lxie@us.ibm.com>
25 #include <linux/pci.h>
26 #include <asm/pci-bridge.h>
28 #include "../pci.h" /* for pci_add_new_bus */
32 struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn)
34 struct pci_dev *retval_dev = NULL, *dev = NULL;
35 char bus_id[BUS_ID_SIZE];
37 sprintf(bus_id, "%04x:%02x:%02x.%d",dn->phb->global_number,
38 dn->busno, PCI_SLOT(dn->devfn), PCI_FUNC(dn->devfn));
39 while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
40 if (!strcmp(pci_name(dev), bus_id)) {
48 EXPORT_SYMBOL_GPL(rpaphp_find_pci_dev);
50 int rpaphp_claim_resource(struct pci_dev *dev, int resource)
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";
58 err = request_resource(root, res);
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);
70 EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
72 static struct pci_dev *rpaphp_find_bridge_pdev(struct slot *slot)
74 return rpaphp_find_pci_dev(slot->dn);
77 static int rpaphp_get_sensor_state(struct slot *slot, int *state)
82 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
85 if (rc == NEED_POWER || rc == PWR_ONLY) {
86 dbg("%s: slot must be power up to get sensor-state\n",
89 /* some slots have to be powered up
90 * before get-sensor will succeed.
92 rc = rtas_set_power_level(slot->power_domain, POWER_ON,
95 dbg("%s: power on slot[%s] failed rc=%d.\n",
96 __FUNCTION__, slot->name, rc);
98 rc = rtas_get_sensor(DR_ENTITY_SENSE,
101 } else if (rc == ERR_SENSE_USE)
102 info("%s: slot is unusable\n", __FUNCTION__);
104 err("%s failed to get sensor state\n", __FUNCTION__);
110 * get_pci_adapter_status - get the status of a slot
113 * 1-- adapter is configured
114 * 2-- adapter is not configured
117 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
122 rc = rpaphp_get_sensor_state(slot, &state);
125 if (state == PRESENT) {
127 /* at run-time slot->state can be changed by */
128 /* config/unconfig adapter */
129 *value = slot->state;
131 if (!slot->dn->child)
132 dbg("%s: %s is not valid OFDT node\n",
133 __FUNCTION__, slot->dn->full_name);
134 else if (rpaphp_find_pci_dev(slot->dn->child))
137 err("%s: can't find pdev of adapter in slot[%s]\n",
138 __FUNCTION__, slot->dn->full_name);
139 *value = NOT_CONFIGURED;
142 } else if (state == EMPTY) {
143 dbg("slot is empty\n");
151 /* Must be called before pci_bus_add_devices */
153 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
157 list_for_each_entry(dev, &bus->devices, bus_list) {
159 * Skip already-present devices (which are on the
160 * global device list.)
162 if (list_empty(&dev->global_list)) {
166 pcibios_fixup_device_resources(dev, bus);
167 pci_read_irq_line(dev);
168 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
169 struct resource *r = &dev->resource[i];
171 if (r->parent || !r->start || !r->flags)
173 rpaphp_claim_resource(dev, i);
179 static int rpaphp_pci_config_bridge(struct pci_dev *dev);
181 /*****************************************************************************
182 rpaphp_pci_config_slot() will configure all devices under the
183 given slot->dn and return the the first pci_dev.
184 *****************************************************************************/
185 static struct pci_dev *
186 rpaphp_pci_config_slot(struct device_node *dn, struct pci_bus *bus)
188 struct device_node *eads_first_child = dn->child;
192 dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
194 if (eads_first_child) {
195 /* pci_scan_slot should find all children of EADs */
196 num = pci_scan_slot(bus, PCI_DEVFN(PCI_SLOT(eads_first_child->devfn), 0));
198 rpaphp_fixup_new_pci_devices(bus, 1);
199 pci_bus_add_devices(bus);
201 dev = rpaphp_find_pci_dev(eads_first_child);
203 err("No new device found\n");
206 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
207 rpaphp_pci_config_bridge(dev);
212 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
215 struct pci_bus *child_bus;
216 struct pci_dev *child_dev;
218 dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
220 /* get busno of downstream bus */
221 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
223 /* add to children of PCI bridge dev->bus */
224 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
226 err("%s: could not add second bus\n", __FUNCTION__);
229 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
230 /* do pci_scan_child_bus */
231 pci_scan_child_bus(child_bus);
233 list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
234 eeh_add_device_late(child_dev);
237 /* fixup new pci devices without touching bus struct */
238 rpaphp_fixup_new_pci_devices(child_bus, 0);
240 /* Make the discovered devices available */
241 pci_bus_add_devices(child_bus);
245 static void enable_eeh(struct device_node *dn)
247 struct device_node *sib;
249 for (sib = dn->child; sib; sib = sib->sibling)
251 eeh_add_device_early(dn);
257 static void print_slot_pci_funcs(struct slot *slot)
261 if (slot->dev_type == PCI_DEV) {
262 printk("pci_funcs of slot[%s]\n", slot->name);
263 if (list_empty(&slot->dev.pci_funcs))
264 printk(" pci_funcs is EMPTY\n");
266 list_for_each (l, &slot->dev.pci_funcs) {
267 struct rpaphp_pci_func *func =
268 list_entry(l, struct rpaphp_pci_func, sibling);
269 printk(" FOUND dev=%s\n", pci_name(func->pci_dev));
275 static void print_slot_pci_funcs(struct slot *slot)
281 static int init_slot_pci_funcs(struct slot *slot)
283 struct device_node *child;
285 for (child = slot->dn->child; child != NULL; child = child->sibling) {
286 struct pci_dev *pdev = rpaphp_find_pci_dev(child);
289 struct rpaphp_pci_func *func;
290 func = kmalloc(sizeof(struct rpaphp_pci_func), GFP_KERNEL);
293 memset(func, 0, sizeof(struct rpaphp_pci_func));
294 INIT_LIST_HEAD(&func->sibling);
295 func->pci_dev = pdev;
296 list_add_tail(&func->sibling, &slot->dev.pci_funcs);
297 print_slot_pci_funcs(slot);
299 err("%s: dn=%s has no pci_dev\n",
300 __FUNCTION__, child->full_name);
307 static int rpaphp_config_pci_adapter(struct slot *slot)
309 struct pci_bus *pci_bus;
313 dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
317 pci_bus = slot->bridge->subordinate;
319 err("%s: can't find bus structure\n", __FUNCTION__);
322 enable_eeh(slot->dn);
323 dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
325 err("%s: can't find any devices.\n", __FUNCTION__);
328 /* associate corresponding pci_dev */
329 rc = init_slot_pci_funcs(slot);
332 print_slot_pci_funcs(slot);
333 if (!list_empty(&slot->dev.pci_funcs))
336 /* slot is not enabled */
337 err("slot doesn't have pci_dev structure\n");
340 dbg("Exit %s: rc=%d\n", __FUNCTION__, rc);
345 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
347 eeh_remove_device(dev);
348 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
349 struct pci_bus *bus = dev->subordinate;
350 struct list_head *ln;
353 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
354 struct pci_dev *pdev = pci_dev_b(ln);
356 rpaphp_eeh_remove_bus_device(pdev);
363 int rpaphp_unconfig_pci_adapter(struct slot *slot)
366 struct list_head *ln;
368 dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
369 if (list_empty(&slot->dev.pci_funcs)) {
370 err("%s: slot[%s] doesn't have any devices.\n", __FUNCTION__,
376 /* remove the devices from the pci core */
377 list_for_each (ln, &slot->dev.pci_funcs) {
378 struct rpaphp_pci_func *func;
380 func = list_entry(ln, struct rpaphp_pci_func, sibling);
382 pci_remove_bus_device(func->pci_dev);
383 rpaphp_eeh_remove_bus_device(func->pci_dev);
387 INIT_LIST_HEAD(&slot->dev.pci_funcs);
388 slot->state = NOT_CONFIGURED;
389 info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
392 dbg("Exit %s, rc=0x%x\n", __FUNCTION__, retval);
396 static int setup_pci_hotplug_slot_info(struct slot *slot)
398 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
400 rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
401 rpaphp_get_pci_adapter_status(slot, 1,
402 &slot->hotplug_slot->info->
404 if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
405 err("%s: NOT_VALID: skip dn->full_name=%s\n",
406 __FUNCTION__, slot->dn->full_name);
412 static int setup_pci_slot(struct slot *slot)
414 slot->bridge = rpaphp_find_bridge_pdev(slot);
415 if (!slot->bridge) { /* slot being added doesn't have pci_dev yet */
416 err("%s: no pci_dev for bridge dn %s\n", __FUNCTION__, slot->name);
419 dbg("%s set slot->name to %s\n", __FUNCTION__, pci_name(slot->bridge));
420 strcpy(slot->name, pci_name(slot->bridge));
422 /* find slot's pci_dev if it's not empty */
423 if (slot->hotplug_slot->info->adapter_status == EMPTY) {
424 slot->state = EMPTY; /* slot is empty */
426 /* slot is occupied */
427 if (!(slot->dn->child)) {
428 /* non-empty slot has to have child */
429 err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
430 __FUNCTION__, slot->name);
433 if (init_slot_pci_funcs(slot)) {
434 err("%s: init_slot_pci_funcs failed\n", __FUNCTION__);
437 print_slot_pci_funcs(slot);
438 if (!list_empty(&slot->dev.pci_funcs)) {
439 slot->state = CONFIGURED;
442 /* DLPAR add as opposed to
444 slot->state = NOT_CONFIGURED;
449 dealloc_slot_struct(slot);
453 int register_pci_slot(struct slot *slot)
457 slot->dev_type = PCI_DEV;
458 if (slot->type == EMBEDDED)
459 slot->removable = EMBEDDED;
461 slot->removable = HOTPLUG;
462 INIT_LIST_HEAD(&slot->dev.pci_funcs);
463 if (setup_pci_hotplug_slot_info(slot))
465 if (setup_pci_slot(slot))
467 rc = register_slot(slot);
472 int rpaphp_enable_pci_slot(struct slot *slot)
474 int retval = 0, state;
476 retval = rpaphp_get_sensor_state(slot, &state);
479 dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
480 /* if slot is not empty, enable the adapter */
481 if (state == PRESENT) {
482 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
483 retval = rpaphp_config_pci_adapter(slot);
485 slot->state = CONFIGURED;
486 dbg("%s: PCI devices in slot[%s] has been configured\n",
487 __FUNCTION__, slot->name);
489 slot->state = NOT_CONFIGURED;
490 dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
491 __FUNCTION__, slot->name);
493 } else if (state == EMPTY) {
494 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
497 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
499 slot->state = NOT_VALID;
503 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
507 struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev)
509 struct list_head *tmp, *n;
512 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
514 struct list_head *ln;
516 slot = list_entry(tmp, struct slot, rpaphp_slot_list);
517 if (slot->bridge == NULL) {
518 if (slot->dev_type == PCI_DEV) {
519 printk(KERN_WARNING "PCI slot missing bridge %s %s \n",
520 slot->name, slot->location);
525 bus = slot->bridge->subordinate;
527 continue; /* should never happen? */
529 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
530 struct pci_dev *pdev = pci_dev_b(ln);
532 return slot->hotplug_slot;
539 EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot);