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/*
* 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/kobject.h>
#include <linux/sysfs.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <asm/rtas.h>
#include "rpaphp.h"
static ssize_t address_read_file (struct hotplug_slot *php_slot, char *buf)
{
int retval;
struct slot *slot = (struct slot *)php_slot->private;
struct pci_bus *bus;
if (!slot)
return -ENOENT;
bus = slot->bus;
if (!bus)
return -ENOENT;
if (bus->self)
retval = sprintf(buf, pci_name(bus->self));
else
retval = sprintf(buf, "%04x:%02x:00.0",
pci_domain_nr(bus), bus->number);
return retval;
}
static struct hotplug_slot_attribute php_attr_address = {
.attr = {.name = "address", .mode = S_IFREG | S_IRUGO},
.show = address_read_file,
};
/* 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->hotplug_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->hotplug_slot->name = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
if (!slot->hotplug_slot->name)
goto error_info;
slot->name = slot->hotplug_slot->name;
strcpy(slot->name, drc_name);
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);
/* remove "address" file */
sysfs_remove_file(&php_slot->kobj, &php_attr_address.attr);
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;
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;
}
retval = pci_hp_register(php_slot);
if (retval) {
err("pci_hp_register failed with error %d\n", retval);
return retval;
}
/* create "address" file */
retval = sysfs_create_file(&php_slot->kobj, &php_attr_address.attr);
if (retval) {
err("sysfs_create_file failed with error %d\n", retval);
goto sysfs_fail;
}
/* add slot to our internal list */
list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
info("Slot [%s] registered\n", slot->name);
return 0;
sysfs_fail:
pci_hp_deregister(php_slot);
return retval;
}
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