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 if (!dn->phb || !dn->phb->bus)
57 return find_bus_among_children(dn->phb->bus, dn);
59 EXPORT_SYMBOL_GPL(rpaphp_find_pci_bus);
61 int rpaphp_claim_resource(struct pci_dev *dev, int resource)
63 struct resource *res = &dev->resource[resource];
64 struct resource *root = pci_find_parent_resource(dev, res);
65 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
69 err = request_resource(root, res);
73 err("PCI: %s region %d of %s %s [%lx:%lx]\n",
74 root ? "Address space collision on" :
75 "No parent found for",
76 resource, dtype, pci_name(dev), res->start, res->end);
81 EXPORT_SYMBOL_GPL(rpaphp_claim_resource);
83 static int rpaphp_get_sensor_state(struct slot *slot, int *state)
88 rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
91 if (rc == -EFAULT || rc == -EEXIST) {
92 dbg("%s: slot must be power up to get sensor-state\n",
95 /* some slots have to be powered up
96 * before get-sensor will succeed.
98 rc = rtas_set_power_level(slot->power_domain, POWER_ON,
101 dbg("%s: power on slot[%s] failed rc=%d.\n",
102 __FUNCTION__, slot->name, rc);
104 rc = rtas_get_sensor(DR_ENTITY_SENSE,
107 } else if (rc == -ENODEV)
108 info("%s: slot is unusable\n", __FUNCTION__);
110 err("%s failed to get sensor state\n", __FUNCTION__);
116 * get_pci_adapter_status - get the status of a slot
119 * 1-- adapter is configured
120 * 2-- adapter is not configured
123 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
129 rc = rpaphp_get_sensor_state(slot, &state);
135 else if (state == PRESENT) {
137 /* at run-time slot->state can be changed by */
138 /* config/unconfig adapter */
139 *value = slot->state;
141 bus = rpaphp_find_pci_bus(slot->dn);
142 if (bus && !list_empty(&bus->devices))
145 *value = NOT_CONFIGURED;
152 /* Must be called before pci_bus_add_devices */
154 rpaphp_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
158 list_for_each_entry(dev, &bus->devices, bus_list) {
160 * Skip already-present devices (which are on the
161 * global device list.)
163 if (list_empty(&dev->global_list)) {
166 /* Need to setup IOMMU tables */
167 ppc_md.iommu_dev_setup(dev);
170 pcibios_fixup_device_resources(dev, bus);
171 pci_read_irq_line(dev);
172 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
173 struct resource *r = &dev->resource[i];
175 if (r->parent || !r->start || !r->flags)
177 rpaphp_claim_resource(dev, i);
183 static int rpaphp_pci_config_bridge(struct pci_dev *dev)
186 struct pci_bus *child_bus;
187 struct pci_dev *child_dev;
189 dbg("Enter %s: BRIDGE dev=%s\n", __FUNCTION__, pci_name(dev));
191 /* get busno of downstream bus */
192 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
194 /* add to children of PCI bridge dev->bus */
195 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
197 err("%s: could not add second bus\n", __FUNCTION__);
200 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
201 /* do pci_scan_child_bus */
202 pci_scan_child_bus(child_bus);
204 list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
205 eeh_add_device_late(child_dev);
208 /* fixup new pci devices without touching bus struct */
209 rpaphp_fixup_new_pci_devices(child_bus, 0);
211 /* Make the discovered devices available */
212 pci_bus_add_devices(child_bus);
216 /*****************************************************************************
217 rpaphp_pci_config_slot() will configure all devices under the
218 given slot->dn and return the the first pci_dev.
219 *****************************************************************************/
220 static struct pci_dev *
221 rpaphp_pci_config_slot(struct pci_bus *bus)
223 struct device_node *dn = pci_bus_to_OF_node(bus);
224 struct pci_dev *dev = NULL;
228 dbg("Enter %s: dn=%s bus=%s\n", __FUNCTION__, dn->full_name, bus->name);
229 if (!dn || !dn->child)
232 slotno = PCI_SLOT(dn->child->devfn);
234 /* pci_scan_slot should find all children */
235 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
237 rpaphp_fixup_new_pci_devices(bus, 1);
238 pci_bus_add_devices(bus);
240 if (list_empty(&bus->devices)) {
241 err("%s: No new device found\n", __FUNCTION__);
244 list_for_each_entry(dev, &bus->devices, bus_list) {
245 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
246 rpaphp_pci_config_bridge(dev);
252 static void enable_eeh(struct device_node *dn)
254 struct device_node *sib;
256 for (sib = dn->child; sib; sib = sib->sibling)
258 eeh_add_device_early(dn);
263 static void print_slot_pci_funcs(struct pci_bus *bus)
265 struct device_node *dn;
268 dn = pci_bus_to_OF_node(bus);
272 dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
273 list_for_each_entry (dev, &bus->devices, bus_list)
274 dbg("\t%s\n", pci_name(dev));
278 int rpaphp_config_pci_adapter(struct pci_bus *bus)
280 struct device_node *dn = pci_bus_to_OF_node(bus);
284 dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name);
289 dev = rpaphp_pci_config_slot(bus);
291 err("%s: can't find any devices.\n", __FUNCTION__);
294 print_slot_pci_funcs(bus);
297 dbg("Exit %s: rc=%d\n", __FUNCTION__, rc);
300 EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter);
302 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev)
304 eeh_remove_device(dev);
305 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
306 struct pci_bus *bus = dev->subordinate;
307 struct list_head *ln;
310 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
311 struct pci_dev *pdev = pci_dev_b(ln);
313 rpaphp_eeh_remove_bus_device(pdev);
320 int rpaphp_unconfig_pci_adapter(struct slot *slot)
322 struct pci_dev *dev, *tmp;
325 list_for_each_entry_safe(dev, tmp, slot->pci_devs, bus_list) {
326 rpaphp_eeh_remove_bus_device(dev);
327 pci_remove_bus_device(dev);
330 slot->state = NOT_CONFIGURED;
331 info("%s: devices in slot[%s] unconfigured.\n", __FUNCTION__,
336 static int setup_pci_hotplug_slot_info(struct slot *slot)
338 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
340 rpaphp_get_power_status(slot, &slot->hotplug_slot->info->power_status);
341 rpaphp_get_pci_adapter_status(slot, 1,
342 &slot->hotplug_slot->info->
344 if (slot->hotplug_slot->info->adapter_status == NOT_VALID) {
345 err("%s: NOT_VALID: skip dn->full_name=%s\n",
346 __FUNCTION__, slot->dn->full_name);
352 static void set_slot_name(struct slot *slot)
354 struct pci_bus *bus = slot->bus;
355 struct pci_dev *bridge;
359 strcpy(slot->name, pci_name(bridge));
361 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
365 static int setup_pci_slot(struct slot *slot)
367 struct device_node *dn = slot->dn;
371 bus = rpaphp_find_pci_bus(dn);
373 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
378 slot->pci_devs = &bus->devices;
381 /* find slot's pci_dev if it's not empty */
382 if (slot->hotplug_slot->info->adapter_status == EMPTY) {
383 slot->state = EMPTY; /* slot is empty */
385 /* slot is occupied */
387 /* non-empty slot has to have child */
388 err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
389 __FUNCTION__, slot->name);
393 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
394 dbg("%s CONFIGURING pci adapter in slot[%s]\n",
395 __FUNCTION__, slot->name);
396 if (rpaphp_config_pci_adapter(slot->bus)) {
397 err("%s: CONFIG pci adapter failed\n", __FUNCTION__);
401 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
402 err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
403 __FUNCTION__, slot->name);
406 print_slot_pci_funcs(slot->bus);
407 if (!list_empty(slot->pci_devs)) {
408 slot->state = CONFIGURED;
410 /* DLPAR add as opposed to
412 slot->state = NOT_CONFIGURED;
417 dealloc_slot_struct(slot);
421 int register_pci_slot(struct slot *slot)
425 if (setup_pci_hotplug_slot_info(slot))
427 if (setup_pci_slot(slot))
429 rc = register_slot(slot);
434 int rpaphp_enable_pci_slot(struct slot *slot)
436 int retval = 0, state;
438 retval = rpaphp_get_sensor_state(slot, &state);
441 dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
442 /* if slot is not empty, enable the adapter */
443 if (state == PRESENT) {
444 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
445 retval = rpaphp_config_pci_adapter(slot->bus);
447 slot->state = CONFIGURED;
448 dbg("%s: PCI devices in slot[%s] has been configured\n",
449 __FUNCTION__, slot->name);
451 slot->state = NOT_CONFIGURED;
452 dbg("%s: no pci_dev struct for adapter in slot[%s]\n",
453 __FUNCTION__, slot->name);
455 } else if (state == EMPTY) {
456 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
459 err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
461 slot->state = NOT_VALID;
465 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);