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 <asm/machdep.h>
29 #include "../pci.h" /* for pci_add_new_bus */
33 struct pci_dev *rpaphp_find_pci_dev(struct device_node *dn)
35 struct pci_dev *dev = NULL;
36 char bus_id[BUS_ID_SIZE];
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)) {
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 == -EFAULT || rc == -EEXIST) {
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 == -ENODEV)
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)
120 struct device_node *child_dn;
121 struct pci_dev *child_dev = NULL;
124 rc = rpaphp_get_sensor_state(slot, &state);
128 if ((state == EMPTY) || (slot->type == PHB)) {
129 dbg("slot is empty\n");
132 else if (state == PRESENT) {
134 /* at run-time slot->state can be changed by */
135 /* config/unconfig adapter */
136 *value = slot->state;
138 child_dn = slot->dn->child;
140 child_dev = rpaphp_find_pci_dev(child_dn);
145 dbg("%s: %s is not valid OFDT node\n",
146 __FUNCTION__, slot->dn->full_name);
148 err("%s: can't find pdev of adapter in slot[%s]\n",
149 __FUNCTION__, slot->dn->full_name);
150 *value = NOT_CONFIGURED;
158 /* Must be called before pci_bus_add_devices */
160 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
164 list_for_each_entry(dev, &bus->devices, bus_list) {
166 * Skip already-present devices (which are on the
167 * global device list.)
169 if (list_empty(&dev->global_list)) {
172 /* Need to setup IOMMU tables */
173 ppc_md.iommu_dev_setup(dev);
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];
181 if (r->parent || !r->start || !r->flags)
183 rpaphp_claim_resource(dev, i);
189 static int rpaphp_pci_config_bridge(struct pci_dev *dev);
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)
198 struct device_node *eads_first_child = dn->child;
199 struct pci_dev *dev = NULL;
202 dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
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));
208 rpaphp_fixup_new_pci_devices(bus, 1);
209 pci_bus_add_devices(bus);
211 dev = rpaphp_find_pci_dev(eads_first_child);
213 err("No new device found\n");
216 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
217 rpaphp_pci_config_bridge(dev);
222 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
225 struct pci_bus *child_bus;
226 struct pci_dev *child_dev;
228 dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
230 /* get busno of downstream bus */
231 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
233 /* add to children of PCI bridge dev->bus */
234 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
236 err("%s: could not add second bus\n", __FUNCTION__);
239 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
240 /* do pci_scan_child_bus */
241 pci_scan_child_bus(child_bus);
243 list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
244 eeh_add_device_late(child_dev);
247 /* fixup new pci devices without touching bus struct */
248 rpaphp_fixup_new_pci_devices(child_bus, 0);
250 /* Make the discovered devices available */
251 pci_bus_add_devices(child_bus);
255 static void enable_eeh(struct device_node *dn)
257 struct device_node *sib;
259 for (sib = dn->child; sib; sib = sib->sibling)
261 eeh_add_device_early(dn);
266 static void print_slot_pci_funcs(struct slot *slot)
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));
278 static int rpaphp_config_pci_adapter(struct slot *slot)
280 struct pci_bus *pci_bus;
284 dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
288 pci_bus = slot->bridge->subordinate;
290 err("%s: can't find bus structure\n", __FUNCTION__);
293 enable_eeh(slot->dn);
294 dev = rpaphp_pci_config_slot(slot->dn, pci_bus);
296 err("%s: can't find any devices.\n", __FUNCTION__);
299 print_slot_pci_funcs(slot);
302 /* slot is not enabled */
303 err("slot doesn't have pci_dev structure\n");
306 dbg("Exit %s: rc=%d\n", __FUNCTION__, rc);
310 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
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;
318 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
319 struct pci_dev *pdev = pci_dev_b(ln);
321 rpaphp_eeh_remove_bus_device(pdev);
328 int rpaphp_unconfig_pci_adapter(struct slot *slot)
333 list_for_each_entry(dev, slot->dev.pci_devs, bus_list)
334 rpaphp_eeh_remove_bus_device(dev);
336 pci_remove_behind_bridge(slot->bridge);
337 slot->state = NOT_CONFIGURED;
338 info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
343 static int setup_pci_hotplug_slot_info(struct slot *slot)
345 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
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->
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);
359 static int set_phb_slot_name(struct slot *slot)
361 struct device_node *dn;
362 struct pci_controller *phb;
378 sprintf(slot->name, "%04x:%02x:%02x.%x", pci_domain_nr(bus),
383 static int setup_pci_slot(struct slot *slot)
388 if (slot->type == PHB) {
389 rc = set_phb_slot_name(slot);
391 err("%s: failed to set phb slot name\n", __FUNCTION__);
395 slot->bridge = rpaphp_find_bridge_pdev(slot);
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);
403 bus = slot->bridge->subordinate;
406 slot->dev.pci_devs = &bus->devices;
408 dbg("%s set slot->name to %s\n", __FUNCTION__,
409 pci_name(slot->bridge));
410 strcpy(slot->name, pci_name(slot->bridge));
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 */
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);
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__);
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);
438 print_slot_pci_funcs(slot);
439 if (!list_empty(slot->dev.pci_devs)) {
440 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) || (slot->type == PHB))
462 if (setup_pci_hotplug_slot_info(slot))
464 if (setup_pci_slot(slot))
466 rc = register_slot(slot);
471 int rpaphp_enable_pci_slot(struct slot *slot)
473 int retval = 0, state;
475 retval = rpaphp_get_sensor_state(slot, &state);
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);
484 slot->state = CONFIGURED;
485 dbg("%s: PCI devices in slot[%s] has been configured\n",
486 __FUNCTION__, slot->name);
488 slot->state = NOT_CONFIGURED;
489 dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
490 __FUNCTION__, slot->name);
492 } else if (state == EMPTY) {
493 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
496 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
498 slot->state = NOT_VALID;
502 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
506 struct hotplug_slot *rpaphp_find_hotplug_slot(struct pci_dev *dev)
508 struct list_head *tmp, *n;
511 list_for_each_safe(tmp, n, &rpaphp_slot_head) {
513 struct list_head *ln;
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);
524 bus = slot->bridge->subordinate;
526 continue; /* should never happen? */
528 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
529 struct pci_dev *pdev = pci_dev_b(ln);
531 return slot->hotplug_slot;
538 EXPORT_SYMBOL_GPL(rpaphp_find_hotplug_slot);