1 // SPDX-License-Identifier: GPL-2.0+
3 * PCI Hotplug Driver for PowerPC PowerNV platform.
5 * Copyright Gavin Shan, IBM Corporation 2016.
8 #include <linux/libfdt.h>
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/pci_hotplug.h>
14 #include <asm/pnv-pci.h>
15 #include <asm/ppc-pci.h>
17 #define DRIVER_VERSION "0.1"
18 #define DRIVER_AUTHOR "Gavin Shan, IBM Corporation"
19 #define DRIVER_DESC "PowerPC PowerNV PCI Hotplug Driver"
21 struct pnv_php_event {
23 struct pnv_php_slot *php_slot;
24 struct work_struct work;
27 static LIST_HEAD(pnv_php_slot_list);
28 static DEFINE_SPINLOCK(pnv_php_lock);
30 static void pnv_php_register(struct device_node *dn);
31 static void pnv_php_unregister_one(struct device_node *dn);
32 static void pnv_php_unregister(struct device_node *dn);
34 static void pnv_php_disable_irq(struct pnv_php_slot *php_slot,
37 struct pci_dev *pdev = php_slot->pdev;
38 int irq = php_slot->irq;
41 if (php_slot->irq > 0) {
42 pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &ctrl);
43 ctrl &= ~(PCI_EXP_SLTCTL_HPIE |
45 PCI_EXP_SLTCTL_DLLSCE);
46 pcie_capability_write_word(pdev, PCI_EXP_SLTCTL, ctrl);
48 free_irq(php_slot->irq, php_slot);
53 destroy_workqueue(php_slot->wq);
57 if (disable_device || irq > 0) {
58 if (pdev->msix_enabled)
59 pci_disable_msix(pdev);
60 else if (pdev->msi_enabled)
61 pci_disable_msi(pdev);
63 pci_disable_device(pdev);
67 static void pnv_php_free_slot(struct kref *kref)
69 struct pnv_php_slot *php_slot = container_of(kref,
70 struct pnv_php_slot, kref);
72 WARN_ON(!list_empty(&php_slot->children));
73 pnv_php_disable_irq(php_slot, false);
74 kfree(php_slot->name);
78 static inline void pnv_php_put_slot(struct pnv_php_slot *php_slot)
84 kref_put(&php_slot->kref, pnv_php_free_slot);
87 static struct pnv_php_slot *pnv_php_match(struct device_node *dn,
88 struct pnv_php_slot *php_slot)
90 struct pnv_php_slot *target, *tmp;
92 if (php_slot->dn == dn) {
93 kref_get(&php_slot->kref);
97 list_for_each_entry(tmp, &php_slot->children, link) {
98 target = pnv_php_match(dn, tmp);
106 struct pnv_php_slot *pnv_php_find_slot(struct device_node *dn)
108 struct pnv_php_slot *php_slot, *tmp;
111 spin_lock_irqsave(&pnv_php_lock, flags);
112 list_for_each_entry(tmp, &pnv_php_slot_list, link) {
113 php_slot = pnv_php_match(dn, tmp);
115 spin_unlock_irqrestore(&pnv_php_lock, flags);
119 spin_unlock_irqrestore(&pnv_php_lock, flags);
123 EXPORT_SYMBOL_GPL(pnv_php_find_slot);
126 * Remove pdn for all children of the indicated device node.
127 * The function should remove pdn in a depth-first manner.
129 static void pnv_php_rmv_pdns(struct device_node *dn)
131 struct device_node *child;
133 for_each_child_of_node(dn, child) {
134 pnv_php_rmv_pdns(child);
136 pci_remove_device_node_info(child);
141 * Detach all child nodes of the indicated device nodes. The
142 * function should handle device nodes in depth-first manner.
144 * We should not invoke of_node_release() as the memory for
145 * individual device node is part of large memory block. The
146 * large block is allocated from memblock (system bootup) or
147 * kmalloc() when unflattening the device tree by OF changeset.
148 * We can not free the large block allocated from memblock. For
149 * later case, it should be released at once.
151 static void pnv_php_detach_device_nodes(struct device_node *parent)
153 struct device_node *dn;
156 for_each_child_of_node(parent, dn) {
157 pnv_php_detach_device_nodes(dn);
160 refcount = kref_read(&dn->kobj.kref);
162 pr_warn("Invalid refcount %d on <%pOF>\n",
169 static void pnv_php_rmv_devtree(struct pnv_php_slot *php_slot)
171 pnv_php_rmv_pdns(php_slot->dn);
174 * Decrease the refcount if the device nodes were created
175 * through OF changeset before detaching them.
178 of_changeset_destroy(&php_slot->ocs);
179 pnv_php_detach_device_nodes(php_slot->dn);
183 kfree(php_slot->fdt);
185 php_slot->dn->child = NULL;
186 php_slot->fdt = NULL;
191 * As the nodes in OF changeset are applied in reverse order, we
192 * need revert the nodes in advance so that we have correct node
193 * order after the changeset is applied.
195 static void pnv_php_reverse_nodes(struct device_node *parent)
197 struct device_node *child, *next;
200 for_each_child_of_node(parent, child)
201 pnv_php_reverse_nodes(child);
203 /* Reverse the nodes in the child list */
204 child = parent->child;
205 parent->child = NULL;
207 next = child->sibling;
209 child->sibling = parent->child;
210 parent->child = child;
215 static int pnv_php_populate_changeset(struct of_changeset *ocs,
216 struct device_node *dn)
218 struct device_node *child;
221 for_each_child_of_node(dn, child) {
222 ret = of_changeset_attach_node(ocs, child);
226 ret = pnv_php_populate_changeset(ocs, child);
234 static void *pnv_php_add_one_pdn(struct device_node *dn, void *data)
236 struct pci_controller *hose = (struct pci_controller *)data;
239 pdn = pci_add_device_node_info(hose, dn);
241 return ERR_PTR(-ENOMEM);
246 static void pnv_php_add_pdns(struct pnv_php_slot *slot)
248 struct pci_controller *hose = pci_bus_to_host(slot->bus);
250 pci_traverse_device_nodes(slot->dn, pnv_php_add_one_pdn, hose);
253 static int pnv_php_add_devtree(struct pnv_php_slot *php_slot)
255 void *fdt, *fdt1, *dt;
258 /* We don't know the FDT blob size. We try to get it through
259 * maximal memory chunk and then copy it to another chunk that
260 * fits the real size.
262 fdt1 = kzalloc(0x10000, GFP_KERNEL);
268 ret = pnv_pci_get_device_tree(php_slot->dn->phandle, fdt1, 0x10000);
270 pci_warn(php_slot->pdev, "Error %d getting FDT blob\n", ret);
274 fdt = kzalloc(fdt_totalsize(fdt1), GFP_KERNEL);
280 /* Unflatten device tree blob */
281 memcpy(fdt, fdt1, fdt_totalsize(fdt1));
282 dt = of_fdt_unflatten_tree(fdt, php_slot->dn, NULL);
285 pci_warn(php_slot->pdev, "Cannot unflatten FDT\n");
289 /* Initialize and apply the changeset */
290 of_changeset_init(&php_slot->ocs);
291 pnv_php_reverse_nodes(php_slot->dn);
292 ret = pnv_php_populate_changeset(&php_slot->ocs, php_slot->dn);
294 pnv_php_reverse_nodes(php_slot->dn);
295 pci_warn(php_slot->pdev, "Error %d populating changeset\n",
300 php_slot->dn->child = NULL;
301 ret = of_changeset_apply(&php_slot->ocs);
303 pci_warn(php_slot->pdev, "Error %d applying changeset\n", ret);
304 goto destroy_changeset;
307 /* Add device node firmware data */
308 pnv_php_add_pdns(php_slot);
315 of_changeset_destroy(&php_slot->ocs);
318 php_slot->dn->child = NULL;
327 int pnv_php_set_slot_power_state(struct hotplug_slot *slot,
330 struct pnv_php_slot *php_slot = slot->private;
334 ret = pnv_pci_set_power_state(php_slot->id, state, &msg);
336 if (be64_to_cpu(msg.params[1]) != php_slot->dn->phandle ||
337 be64_to_cpu(msg.params[2]) != state ||
338 be64_to_cpu(msg.params[3]) != OPAL_SUCCESS) {
339 pci_warn(php_slot->pdev, "Wrong msg (%lld, %lld, %lld)\n",
340 be64_to_cpu(msg.params[1]),
341 be64_to_cpu(msg.params[2]),
342 be64_to_cpu(msg.params[3]));
345 } else if (ret < 0) {
346 pci_warn(php_slot->pdev, "Error %d powering %s\n",
347 ret, (state == OPAL_PCI_SLOT_POWER_ON) ? "on" : "off");
351 if (state == OPAL_PCI_SLOT_POWER_OFF || state == OPAL_PCI_SLOT_OFFLINE)
352 pnv_php_rmv_devtree(php_slot);
354 ret = pnv_php_add_devtree(php_slot);
358 EXPORT_SYMBOL_GPL(pnv_php_set_slot_power_state);
360 static int pnv_php_get_power_state(struct hotplug_slot *slot, u8 *state)
362 struct pnv_php_slot *php_slot = slot->private;
363 uint8_t power_state = OPAL_PCI_SLOT_POWER_ON;
367 * Retrieve power status from firmware. If we fail
368 * getting that, the power status fails back to
371 ret = pnv_pci_get_power_state(php_slot->id, &power_state);
373 pci_warn(php_slot->pdev, "Error %d getting power status\n",
376 *state = power_state;
377 slot->info->power_status = power_state;
383 static int pnv_php_get_adapter_state(struct hotplug_slot *slot, u8 *state)
385 struct pnv_php_slot *php_slot = slot->private;
386 uint8_t presence = OPAL_PCI_SLOT_EMPTY;
390 * Retrieve presence status from firmware. If we can't
391 * get that, it will fail back to be empty.
393 ret = pnv_pci_get_presence_state(php_slot->id, &presence);
396 slot->info->adapter_status = presence;
399 pci_warn(php_slot->pdev, "Error %d getting presence\n", ret);
405 static int pnv_php_set_attention_state(struct hotplug_slot *slot, u8 state)
407 /* FIXME: Make it real once firmware supports it */
408 slot->info->attention_status = state;
413 static int pnv_php_enable(struct pnv_php_slot *php_slot, bool rescan)
415 struct hotplug_slot *slot = &php_slot->slot;
416 uint8_t presence = OPAL_PCI_SLOT_EMPTY;
417 uint8_t power_status = OPAL_PCI_SLOT_POWER_ON;
420 /* Check if the slot has been configured */
421 if (php_slot->state != PNV_PHP_STATE_REGISTERED)
424 /* Retrieve slot presence status */
425 ret = pnv_php_get_adapter_state(slot, &presence);
430 * Proceed if there have nothing behind the slot. However,
431 * we should leave the slot in registered state at the
432 * beginning. Otherwise, the PCI devices inserted afterwards
433 * won't be probed and populated.
435 if (presence == OPAL_PCI_SLOT_EMPTY) {
436 if (!php_slot->power_state_check) {
437 php_slot->power_state_check = true;
446 * If the power supply to the slot is off, we can't detect
447 * adapter presence state. That means we have to turn the
448 * slot on before going to probe slot's presence state.
450 * On the first time, we don't change the power status to
451 * boost system boot with assumption that the firmware
452 * supplies consistent slot power status: empty slot always
453 * has its power off and non-empty slot has its power on.
455 if (!php_slot->power_state_check) {
456 php_slot->power_state_check = true;
458 ret = pnv_php_get_power_state(slot, &power_status);
462 if (power_status != OPAL_PCI_SLOT_POWER_ON)
466 /* Check the power status. Scan the slot if it is already on */
467 ret = pnv_php_get_power_state(slot, &power_status);
471 if (power_status == OPAL_PCI_SLOT_POWER_ON)
474 /* Power is off, turn it on and then scan the slot */
475 ret = pnv_php_set_slot_power_state(slot, OPAL_PCI_SLOT_POWER_ON);
480 if (presence == OPAL_PCI_SLOT_PRESENT) {
482 pci_lock_rescan_remove();
483 pci_hp_add_devices(php_slot->bus);
484 pci_unlock_rescan_remove();
487 /* Rescan for child hotpluggable slots */
488 php_slot->state = PNV_PHP_STATE_POPULATED;
490 pnv_php_register(php_slot->dn);
492 php_slot->state = PNV_PHP_STATE_POPULATED;
498 static int pnv_php_enable_slot(struct hotplug_slot *slot)
500 struct pnv_php_slot *php_slot = container_of(slot,
501 struct pnv_php_slot, slot);
503 return pnv_php_enable(php_slot, true);
506 static int pnv_php_disable_slot(struct hotplug_slot *slot)
508 struct pnv_php_slot *php_slot = slot->private;
511 if (php_slot->state != PNV_PHP_STATE_POPULATED)
514 /* Remove all devices behind the slot */
515 pci_lock_rescan_remove();
516 pci_hp_remove_devices(php_slot->bus);
517 pci_unlock_rescan_remove();
519 /* Detach the child hotpluggable slots */
520 pnv_php_unregister(php_slot->dn);
522 /* Notify firmware and remove device nodes */
523 ret = pnv_php_set_slot_power_state(slot, OPAL_PCI_SLOT_POWER_OFF);
525 php_slot->state = PNV_PHP_STATE_REGISTERED;
529 static struct hotplug_slot_ops php_slot_ops = {
530 .get_power_status = pnv_php_get_power_state,
531 .get_adapter_status = pnv_php_get_adapter_state,
532 .set_attention_status = pnv_php_set_attention_state,
533 .enable_slot = pnv_php_enable_slot,
534 .disable_slot = pnv_php_disable_slot,
537 static void pnv_php_release(struct hotplug_slot *slot)
539 struct pnv_php_slot *php_slot = slot->private;
542 /* Remove from global or child list */
543 spin_lock_irqsave(&pnv_php_lock, flags);
544 list_del(&php_slot->link);
545 spin_unlock_irqrestore(&pnv_php_lock, flags);
547 /* Detach from parent */
548 pnv_php_put_slot(php_slot);
549 pnv_php_put_slot(php_slot->parent);
552 static struct pnv_php_slot *pnv_php_alloc_slot(struct device_node *dn)
554 struct pnv_php_slot *php_slot;
560 ret = of_property_read_string(dn, "ibm,slot-label", &label);
564 if (pnv_pci_get_slot_id(dn, &id))
567 bus = pci_find_bus_by_node(dn);
571 php_slot = kzalloc(sizeof(*php_slot), GFP_KERNEL);
575 php_slot->name = kstrdup(label, GFP_KERNEL);
576 if (!php_slot->name) {
581 if (dn->child && PCI_DN(dn->child))
582 php_slot->slot_no = PCI_SLOT(PCI_DN(dn->child)->devfn);
584 php_slot->slot_no = -1; /* Placeholder slot */
586 kref_init(&php_slot->kref);
587 php_slot->state = PNV_PHP_STATE_INITIALIZED;
589 php_slot->pdev = bus->self;
592 php_slot->power_state_check = false;
593 php_slot->slot.ops = &php_slot_ops;
594 php_slot->slot.info = &php_slot->slot_info;
595 php_slot->slot.release = pnv_php_release;
596 php_slot->slot.private = php_slot;
598 INIT_LIST_HEAD(&php_slot->children);
599 INIT_LIST_HEAD(&php_slot->link);
604 static int pnv_php_register_slot(struct pnv_php_slot *php_slot)
606 struct pnv_php_slot *parent;
607 struct device_node *dn = php_slot->dn;
611 /* Check if the slot is registered or not */
612 parent = pnv_php_find_slot(php_slot->dn);
614 pnv_php_put_slot(parent);
618 /* Register PCI slot */
619 ret = pci_hp_register(&php_slot->slot, php_slot->bus,
620 php_slot->slot_no, php_slot->name);
622 pci_warn(php_slot->pdev, "Error %d registering slot\n", ret);
626 /* Attach to the parent's child list or global list */
627 while ((dn = of_get_parent(dn))) {
633 parent = pnv_php_find_slot(dn);
642 spin_lock_irqsave(&pnv_php_lock, flags);
643 php_slot->parent = parent;
645 list_add_tail(&php_slot->link, &parent->children);
647 list_add_tail(&php_slot->link, &pnv_php_slot_list);
648 spin_unlock_irqrestore(&pnv_php_lock, flags);
650 php_slot->state = PNV_PHP_STATE_REGISTERED;
654 static int pnv_php_enable_msix(struct pnv_php_slot *php_slot)
656 struct pci_dev *pdev = php_slot->pdev;
657 struct msix_entry entry;
661 /* Get total number of MSIx entries */
662 nr_entries = pci_msix_vec_count(pdev);
666 /* Check hotplug MSIx entry is in range */
667 pcie_capability_read_word(pdev, PCI_EXP_FLAGS, &pcie_flag);
668 entry.entry = (pcie_flag & PCI_EXP_FLAGS_IRQ) >> 9;
669 if (entry.entry >= nr_entries)
673 ret = pci_enable_msix_exact(pdev, &entry, 1);
675 pci_warn(pdev, "Error %d enabling MSIx\n", ret);
682 static void pnv_php_event_handler(struct work_struct *work)
684 struct pnv_php_event *event =
685 container_of(work, struct pnv_php_event, work);
686 struct pnv_php_slot *php_slot = event->php_slot;
689 pnv_php_enable_slot(&php_slot->slot);
691 pnv_php_disable_slot(&php_slot->slot);
696 static irqreturn_t pnv_php_interrupt(int irq, void *data)
698 struct pnv_php_slot *php_slot = data;
699 struct pci_dev *pchild, *pdev = php_slot->pdev;
700 struct eeh_dev *edev;
702 struct pnv_php_event *event;
709 pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &sts);
710 sts &= (PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_DLLSC);
711 pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, sts);
712 if (sts & PCI_EXP_SLTSTA_DLLSC) {
713 pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lsts);
714 added = !!(lsts & PCI_EXP_LNKSTA_DLLLA);
715 } else if (!(php_slot->flags & PNV_PHP_FLAG_BROKEN_PDC) &&
716 (sts & PCI_EXP_SLTSTA_PDC)) {
717 ret = pnv_pci_get_presence_state(php_slot->id, &presence);
719 pci_warn(pdev, "PCI slot [%s] error %d getting presence (0x%04x), to retry the operation.\n",
720 php_slot->name, ret, sts);
724 added = !!(presence == OPAL_PCI_SLOT_PRESENT);
729 /* Freeze the removed PE to avoid unexpected error reporting */
731 pchild = list_first_entry_or_null(&php_slot->bus->devices,
732 struct pci_dev, bus_list);
733 edev = pchild ? pci_dev_to_eeh_dev(pchild) : NULL;
734 pe = edev ? edev->pe : NULL;
736 eeh_serialize_lock(&flags);
737 eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
738 eeh_serialize_unlock(flags);
739 eeh_pe_set_option(pe, EEH_OPT_FREEZE_PE);
744 * The PE is left in frozen state if the event is missed. It's
745 * fine as the PCI devices (PE) aren't functional any more.
747 event = kzalloc(sizeof(*event), GFP_ATOMIC);
749 pci_warn(pdev, "PCI slot [%s] missed hotplug event 0x%04x\n",
750 php_slot->name, sts);
754 pci_info(pdev, "PCI slot [%s] %s (IRQ: %d)\n",
755 php_slot->name, added ? "added" : "removed", irq);
756 INIT_WORK(&event->work, pnv_php_event_handler);
757 event->added = added;
758 event->php_slot = php_slot;
759 queue_work(php_slot->wq, &event->work);
764 static void pnv_php_init_irq(struct pnv_php_slot *php_slot, int irq)
766 struct pci_dev *pdev = php_slot->pdev;
771 /* Allocate workqueue */
772 php_slot->wq = alloc_workqueue("pciehp-%s", 0, 0, php_slot->name);
774 pci_warn(pdev, "Cannot alloc workqueue\n");
775 pnv_php_disable_irq(php_slot, true);
779 /* Check PDC (Presence Detection Change) is broken or not */
780 ret = of_property_read_u32(php_slot->dn, "ibm,slot-broken-pdc",
782 if (!ret && broken_pdc)
783 php_slot->flags |= PNV_PHP_FLAG_BROKEN_PDC;
785 /* Clear pending interrupts */
786 pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &sts);
787 if (php_slot->flags & PNV_PHP_FLAG_BROKEN_PDC)
788 sts |= PCI_EXP_SLTSTA_DLLSC;
790 sts |= (PCI_EXP_SLTSTA_PDC | PCI_EXP_SLTSTA_DLLSC);
791 pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, sts);
793 /* Request the interrupt */
794 ret = request_irq(irq, pnv_php_interrupt, IRQF_SHARED,
795 php_slot->name, php_slot);
797 pnv_php_disable_irq(php_slot, true);
798 pci_warn(pdev, "Error %d enabling IRQ %d\n", ret, irq);
802 /* Enable the interrupts */
803 pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &ctrl);
804 if (php_slot->flags & PNV_PHP_FLAG_BROKEN_PDC) {
805 ctrl &= ~PCI_EXP_SLTCTL_PDCE;
806 ctrl |= (PCI_EXP_SLTCTL_HPIE |
807 PCI_EXP_SLTCTL_DLLSCE);
809 ctrl |= (PCI_EXP_SLTCTL_HPIE |
810 PCI_EXP_SLTCTL_PDCE |
811 PCI_EXP_SLTCTL_DLLSCE);
813 pcie_capability_write_word(pdev, PCI_EXP_SLTCTL, ctrl);
815 /* The interrupt is initialized successfully when @irq is valid */
819 static void pnv_php_enable_irq(struct pnv_php_slot *php_slot)
821 struct pci_dev *pdev = php_slot->pdev;
825 * The MSI/MSIx interrupt might have been occupied by other
826 * drivers. Don't populate the surprise hotplug capability
829 if (pci_dev_msi_enabled(pdev))
832 ret = pci_enable_device(pdev);
834 pci_warn(pdev, "Error %d enabling device\n", ret);
838 pci_set_master(pdev);
840 /* Enable MSIx interrupt */
841 irq = pnv_php_enable_msix(php_slot);
843 pnv_php_init_irq(php_slot, irq);
848 * Use MSI if MSIx doesn't work. Fail back to legacy INTx
849 * if MSI doesn't work either
851 ret = pci_enable_msi(pdev);
852 if (!ret || pdev->irq) {
854 pnv_php_init_irq(php_slot, irq);
858 static int pnv_php_register_one(struct device_node *dn)
860 struct pnv_php_slot *php_slot;
864 /* Check if it's hotpluggable slot */
865 ret = of_property_read_u32(dn, "ibm,slot-pluggable", &prop32);
869 ret = of_property_read_u32(dn, "ibm,reset-by-firmware", &prop32);
873 php_slot = pnv_php_alloc_slot(dn);
877 ret = pnv_php_register_slot(php_slot);
881 ret = pnv_php_enable(php_slot, false);
883 goto unregister_slot;
885 /* Enable interrupt if the slot supports surprise hotplug */
886 ret = of_property_read_u32(dn, "ibm,slot-surprise-pluggable", &prop32);
888 pnv_php_enable_irq(php_slot);
893 pnv_php_unregister_one(php_slot->dn);
895 pnv_php_put_slot(php_slot);
899 static void pnv_php_register(struct device_node *dn)
901 struct device_node *child;
904 * The parent slots should be registered before their
907 for_each_child_of_node(dn, child) {
908 pnv_php_register_one(child);
909 pnv_php_register(child);
913 static void pnv_php_unregister_one(struct device_node *dn)
915 struct pnv_php_slot *php_slot;
917 php_slot = pnv_php_find_slot(dn);
921 php_slot->state = PNV_PHP_STATE_OFFLINE;
922 pnv_php_put_slot(php_slot);
923 pci_hp_deregister(&php_slot->slot);
926 static void pnv_php_unregister(struct device_node *dn)
928 struct device_node *child;
930 /* The child slots should go before their parent slots */
931 for_each_child_of_node(dn, child) {
932 pnv_php_unregister(child);
933 pnv_php_unregister_one(child);
937 static int __init pnv_php_init(void)
939 struct device_node *dn;
941 pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
942 for_each_compatible_node(dn, NULL, "ibm,ioda2-phb")
943 pnv_php_register(dn);
948 static void __exit pnv_php_exit(void)
950 struct device_node *dn;
952 for_each_compatible_node(dn, NULL, "ibm,ioda2-phb")
953 pnv_php_unregister(dn);
956 module_init(pnv_php_init);
957 module_exit(pnv_php_exit);
959 MODULE_VERSION(DRIVER_VERSION);
960 MODULE_LICENSE("GPL v2");
961 MODULE_AUTHOR(DRIVER_AUTHOR);
962 MODULE_DESCRIPTION(DRIVER_DESC);