/*
* 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 location_read_file (struct hotplug_slot *php_slot, char *buf)
{
char *value;
int retval = -ENOENT;
struct slot *slot = (struct slot *)php_slot->private;
if (!slot)
return retval;
value = slot->location;
retval = sprintf (buf, "%s\n", value);
return retval;
}
static struct hotplug_slot_attribute hotplug_slot_attr_location = {
.attr = {.name = "phy_location", .mode = S_IFREG | S_IRUGO},
.show = location_read_file,
};
static void rpaphp_sysfs_add_attr_location (struct hotplug_slot *slot)
{
sysfs_create_file(&slot->kobj, &hotplug_slot_attr_location.attr);
}
static void rpaphp_sysfs_remove_attr_location (struct hotplug_slot *slot)
{
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_location.attr);
}
/* 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);
return;
}
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(BUS_ID_SIZE + 1, GFP_KERNEL);
if (!slot->hotplug_slot->name)
goto error_info;
slot->location = kmalloc(strlen(drc_name) + 1, GFP_KERNEL);
if (!slot->location)
goto error_name;
slot->name = slot->hotplug_slot->name;
slot->dn = dn;
slot->index = drc_index;
strcpy(slot->location, drc_name);
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_name:
kfree(slot->hotplug_slot->name);
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",
__FUNCTION__, slot->name);
list_del(&slot->rpaphp_slot_list);
/* remove "phy_location" file */
rpaphp_sysfs_remove_attr_location(php_slot);
retval = pci_hp_deregister(php_slot);
if (retval)
err("Problem unregistering a slot %s\n", slot->name);
else
num_slots--;
dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
return retval;
}
EXPORT_SYMBOL_GPL(rpaphp_deregister_slot);
int rpaphp_register_slot(struct slot *slot)
{
int retval;
dbg("%s registering slot:path[%s] index[%x], name[%s] pdomain[%x] type[%d]\n",
__FUNCTION__, 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)) { /* should't be here */
err("rpaphp_register_slot: slot[%s] is already registered\n", slot->name);
rpaphp_release_slot(slot->hotplug_slot);
return -EAGAIN;
}
retval = pci_hp_register(slot->hotplug_slot);
if (retval) {
err("pci_hp_register failed with error %d\n", retval);
rpaphp_release_slot(slot->hotplug_slot);
return retval;
}
/* create "phy_locatoin" file */
rpaphp_sysfs_add_attr_location(slot->hotplug_slot);
/* add slot to our internal list */
dbg("%s adding slot[%s] to rpaphp_slot_list\n",
__FUNCTION__, slot->name);
list_add(&slot->rpaphp_slot_list, &rpaphp_slot_head);
info("Slot [%s](PCI location=%s) registered\n", slot->name,
slot->location);
num_slots++;
return 0;
}
int rpaphp_get_power_status(struct slot *slot, u8 * value)
{
int rc = 0, level;
rc = rtas_get_power_level(slot->power_domain, &level);
if (rc < 0) {
err("failed to get power-level for slot(%s), rc=0x%x\n",
slot->location, rc);
return rc;
}
dbg("%s the power level of slot %s(pwd-domain:0x%x) is %d\n",
__FUNCTION__, slot->name, slot->power_domain, level);
*value = level;
return rc;
}
int rpaphp_set_attention_status(struct slot *slot, u8 status)
{
int rc;
/* status: LED_OFF or LED_ON */
rc = rtas_set_indicator(DR_INDICATOR, slot->index, status);
if (rc < 0)
err("slot(name=%s location=%s index=0x%x) set attention-status(%d) failed! rc=0x%x\n",
slot->name, slot->location, slot->index, status, rc);
return rc;
}
