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 static struct pci_bus *find_bus_among_children(struct pci_bus *bus,
34 struct device_node *dn)
36 struct pci_bus *child = NULL;
37 struct list_head *tmp;
38 struct device_node *busdn;
40 busdn = pci_bus_to_OF_node(bus);
44 list_for_each(tmp, &bus->children) {
45 child = find_bus_among_children(pci_bus_b(tmp), dn);
52 struct pci_bus *rpaphp_find_pci_bus(struct device_node *dn)
54 struct pci_dn *pdn = dn->data;
56 if (!pdn || !pdn->phb || !pdn->phb->bus)
59 return find_bus_among_children(pdn->phb->bus, dn);
61 EXPORT_SYMBOL_GPL(rpaphp_find_pci_bus);
63 int rpaphp_claim_resource(struct pci_dev *dev, int resource)
65 struct resource *res = &dev->resource[resource];
66 struct resource *root = pci_find_parent_resource(dev, res);
67 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
71 err = request_resource(root, res);
75 err("PCI: %s region %d of %s %s [%lx:%lx]\n",
76 root ? "Address space collision on" :
77 "No parent found for",
78 resource, dtype, pci_name(dev), res->start, res->end);
83 EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
85 static int rpaphp_get_sensor_state(struct slot *slot, int *state)
90 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
93 if (rc == -EFAULT || rc == -EEXIST) {
94 dbg("%s: slot must be power up to get sensor-state\n",
97 /* some slots have to be powered up
98 * before get-sensor will succeed.
100 rc = rtas_set_power_level(slot->power_domain, POWER_ON,
103 dbg("%s: power on slot[%s] failed rc=%d.\n",
104 __FUNCTION__, slot->name, rc);
106 rc = rtas_get_sensor(DR_ENTITY_SENSE,
109 } else if (rc == -ENODEV)
110 info("%s: slot is unusable\n", __FUNCTION__);
112 err("%s failed to get sensor state\n", __FUNCTION__);
118 * get_pci_adapter_status - get the status of a slot
121 * 1-- adapter is configured
122 * 2-- adapter is not configured
125 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
131 rc = rpaphp_get_sensor_state(slot, &state);
137 else if (state == PRESENT) {
139 /* at run-time slot->state can be changed by */
140 /* config/unconfig adapter */
141 *value = slot->state;
143 bus = rpaphp_find_pci_bus(slot->dn);
144 if (bus && !list_empty(&bus->devices))
147 *value = NOT_CONFIGURED;
154 /* Must be called before pci_bus_add_devices */
156 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
160 list_for_each_entry(dev, &bus->devices, bus_list) {
162 * Skip already-present devices (which are on the
163 * global device list.)
165 if (list_empty(&dev->global_list)) {
168 /* Need to setup IOMMU tables */
169 ppc_md.iommu_dev_setup(dev);
172 pcibios_fixup_device_resources(dev, bus);
173 pci_read_irq_line(dev);
174 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
175 struct resource *r = &dev->resource[i];
177 if (r->parent || !r->start || !r->flags)
179 rpaphp_claim_resource(dev, i);
185 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
188 struct pci_bus *child_bus;
189 struct pci_dev *child_dev;
191 dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
193 /* get busno of downstream bus */
194 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
196 /* add to children of PCI bridge dev->bus */
197 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
199 err("%s: could not add second bus\n", __FUNCTION__);
202 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
203 /* do pci_scan_child_bus */
204 pci_scan_child_bus(child_bus);
206 list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
207 eeh_add_device_late(child_dev);
210 /* fixup new pci devices without touching bus struct */
211 rpaphp_fixup_new_pci_devices(child_bus, 0);
213 /* Make the discovered devices available */
214 pci_bus_add_devices(child_bus);
218 /*****************************************************************************
219 rpaphp_pci_config_slot() will configure all devices under the
220 given slot->dn and return the the first pci_dev.
221 *****************************************************************************/
222 static struct pci_dev *
223 rpaphp_pci_config_slot(struct pci_bus *bus)
225 struct device_node *dn = pci_bus_to_OF_node(bus);
226 struct pci_dev *dev = NULL;
230 dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
231 if (!dn || !dn->child)
234 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
236 /* pci_scan_slot should find all children */
237 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
239 rpaphp_fixup_new_pci_devices(bus, 1);
240 pci_bus_add_devices(bus);
242 if (list_empty(&bus->devices)) {
243 err("%s: No new device found\n", __FUNCTION__);
246 list_for_each_entry(dev, &bus->devices, bus_list) {
247 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
248 rpaphp_pci_config_bridge(dev);
254 static void enable_eeh(struct device_node *dn)
256 struct device_node *sib;
258 for (sib = dn->child; sib; sib = sib->sibling)
260 eeh_add_device_early(dn);
265 static void print_slot_pci_funcs(struct pci_bus *bus)
267 struct device_node *dn;
270 dn = pci_bus_to_OF_node(bus);
274 dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
275 list_for_each_entry (dev, &bus->devices, bus_list)
276 dbg("\t%s\n", pci_name(dev));
280 int rpaphp_config_pci_adapter(struct pci_bus *bus)
282 struct device_node *dn = pci_bus_to_OF_node(bus);
286 dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name);
291 dev = rpaphp_pci_config_slot(bus);
293 err("%s: can't find any devices.\n", __FUNCTION__);
296 print_slot_pci_funcs(bus);
299 dbg("Exit %s: rc=%d\n", __FUNCTION__, rc);
302 EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter);
304 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
306 eeh_remove_device(dev);
307 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
308 struct pci_bus *bus = dev->subordinate;
309 struct list_head *ln;
312 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
313 struct pci_dev *pdev = pci_dev_b(ln);
315 rpaphp_eeh_remove_bus_device(pdev);
322 int rpaphp_unconfig_pci_adapter(struct slot *slot)
324 struct pci_dev *dev, *tmp;
327 list_for_each_entry_safe(dev, tmp, slot->pci_devs, bus_list) {
328 rpaphp_eeh_remove_bus_device(dev);
329 pci_remove_bus_device(dev);
332 slot->state = NOT_CONFIGURED;
333 info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
338 static int setup_pci_hotplug_slot_info(struct slot *slot)
340 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
342 rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
343 rpaphp_get_pci_adapter_status(slot, 1,
344 &slot->hotplug_slot->info->
346 if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
347 err("%s: NOT_VALID: skip dn->full_name=%s\n",
348 __FUNCTION__, slot->dn->full_name);
354 static void set_slot_name(struct slot *slot)
356 struct pci_bus *bus = slot->bus;
357 struct pci_dev *bridge;
361 strcpy(slot->name, pci_name(bridge));
363 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
367 static int setup_pci_slot(struct slot *slot)
369 struct device_node *dn = slot->dn;
373 bus = rpaphp_find_pci_bus(dn);
375 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
380 slot->pci_devs = &bus->devices;
383 /* find slot's pci_dev if it's not empty */
384 if (slot->hotplug_slot->info->adapter_status == EMPTY) {
385 slot->state = EMPTY; /* slot is empty */
387 /* slot is occupied */
389 /* non-empty slot has to have child */
390 err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
391 __FUNCTION__, slot->name);
395 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
396 dbg("%s CONFIGURING pci adapter in slot[%s]\n",
397 __FUNCTION__, slot->name);
398 if (rpaphp_config_pci_adapter(slot->bus)) {
399 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
403 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
404 err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
405 __FUNCTION__, slot->name);
408 print_slot_pci_funcs(slot->bus);
409 if (!list_empty(slot->pci_devs)) {
410 slot->state = CONFIGURED;
412 /* DLPAR add as opposed to
414 slot->state = NOT_CONFIGURED;
419 dealloc_slot_struct(slot);
423 int register_pci_slot(struct slot *slot)
427 if (setup_pci_hotplug_slot_info(slot))
429 if (setup_pci_slot(slot))
431 rc = register_slot(slot);
436 int rpaphp_enable_pci_slot(struct slot *slot)
438 int retval = 0, state;
440 retval = rpaphp_get_sensor_state(slot, &state);
443 dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
444 /* if slot is not empty, enable the adapter */
445 if (state == PRESENT) {
446 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
447 retval = rpaphp_config_pci_adapter(slot->bus);
449 slot->state = CONFIGURED;
450 dbg("%s: PCI devices in slot[%s] has been configured\n",
451 __FUNCTION__, slot->name);
453 slot->state = NOT_CONFIGURED;
454 dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
455 __FUNCTION__, slot->name);
457 } else if (state == EMPTY) {
458 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
461 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
463 slot->state = NOT_VALID;
467 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);