diff options
Diffstat (limited to 'kernel/drivers/pci/hotplug/rpaphp_slot.c')
| -rw-r--r-- | kernel/drivers/pci/hotplug/rpaphp_slot.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/kernel/drivers/pci/hotplug/rpaphp_slot.c b/kernel/drivers/pci/hotplug/rpaphp_slot.c new file mode 100644 index 000000000..a6082cc26 --- /dev/null +++ b/kernel/drivers/pci/hotplug/rpaphp_slot.c @@ -0,0 +1,147 @@ +/* + * RPA Virtual I/O device functions + * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com> + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Send feedback to <lxie@us.ibm.com> + * + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/sysfs.h> +#include <linux/pci.h> +#include <linux/string.h> +#include <linux/slab.h> + +#include <asm/rtas.h> +#include "rpaphp.h" + +/* free up the memory used by a slot */ +static void rpaphp_release_slot(struct hotplug_slot *hotplug_slot) +{ + struct slot *slot = (struct slot *) hotplug_slot->private; + dealloc_slot_struct(slot); +} + +void dealloc_slot_struct(struct slot *slot) +{ + kfree(slot->hotplug_slot->info); + kfree(slot->name); + kfree(slot->hotplug_slot); + kfree(slot); +} + +struct slot *alloc_slot_struct(struct device_node *dn, + int drc_index, char *drc_name, int power_domain) +{ + struct slot *slot; + + slot = kzalloc(sizeof(struct slot), GFP_KERNEL); + if (!slot) + goto error_nomem; + slot->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL); + if (!slot->hotplug_slot) + goto error_slot; + slot->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info), + GFP_KERNEL); + if (!slot->hotplug_slot->info) + goto error_hpslot; + slot->name = kstrdup(drc_name, GFP_KERNEL); + if (!slot->name) + goto error_info; + slot->dn = dn; + slot->index = drc_index; + slot->power_domain = power_domain; + slot->hotplug_slot->private = slot; + slot->hotplug_slot->ops = &rpaphp_hotplug_slot_ops; + slot->hotplug_slot->release = &rpaphp_release_slot; + + return (slot); + +error_info: + kfree(slot->hotplug_slot->info); +error_hpslot: + kfree(slot->hotplug_slot); +error_slot: + kfree(slot); +error_nomem: + return NULL; +} + +static int is_registered(struct slot *slot) +{ + struct slot *tmp_slot; + + list_for_each_entry(tmp_slot, &rpaphp_slot_head, rpaphp_slot_list) { + if (!strcmp(tmp_slot->name, slot->name)) + return 1; + } + return 0; +} + +int rpaphp_deregister_slot(struct slot *slot) +{ + int retval = 0; + struct hotplug_slot *php_slot = slot->hotplug_slot; + + dbg("%s - Entry: deregistering slot=%s\n", + __func__, slot->name); + + list_del(&slot->rpaphp_slot_list); + + retval = pci_hp_deregister(php_slot); + if (retval) + err("Problem unregistering a slot %s\n", slot->name); + + dbg("%s - Exit: rc[%d]\n", __func__, retval); + return retval; +} +EXPORT_SYMBOL_GPL(rpaphp_deregister_slot); + +int rpaphp_register_slot(struct slot *slot) +{ + struct hotplug_slot *php_slot = slot->hotplug_slot; + int retval; + int slotno; + + dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n", + __func__, slot->dn->full_name, slot->index, slot->name, + slot->power_domain, slot->type); + + /* should not try to register the same slot twice */ + if (is_registered(slot)) { + err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name); + return -EAGAIN; + } + + if (slot->dn->child) + slotno = PCI_SLOT(PCI_DN(slot->dn->child)->devfn); + else + slotno = -1; + retval = pci_hp_register(php_slot, slot->bus, slotno, slot->name); + if (retval) { + err("pci_hp_register failed with error %d\n", retval); + return retval; + } + + /* add slot to our internal list */ + list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head); + info("Slot [%s] registered\n", slot->name); + return 0; +} |