119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* RPA Virtual I/O device functions
|
|
* Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* 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 */
|
|
void dealloc_slot_struct(struct slot *slot)
|
|
{
|
|
of_node_put(slot->dn);
|
|
kfree(slot->name);
|
|
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->name = kstrdup(drc_name, GFP_KERNEL);
|
|
if (!slot->name)
|
|
goto error_slot;
|
|
slot->dn = of_node_get(dn);
|
|
slot->index = drc_index;
|
|
slot->power_domain = power_domain;
|
|
slot->hotplug_slot.ops = &rpaphp_hotplug_slot_ops;
|
|
|
|
return (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);
|
|
pci_hp_deregister(php_slot);
|
|
dealloc_slot_struct(slot);
|
|
|
|
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;
|
|
struct device_node *child;
|
|
u32 my_index;
|
|
int retval;
|
|
int slotno = -1;
|
|
|
|
dbg("%s registering slot:path[%pOF] index[%x], name[%s] pdomain[%x] type[%d]\n",
|
|
__func__, slot->dn, 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;
|
|
}
|
|
|
|
for_each_child_of_node(slot->dn, child) {
|
|
retval = of_property_read_u32(child, "ibm,my-drc-index", &my_index);
|
|
if (my_index == slot->index) {
|
|
slotno = PCI_SLOT(PCI_DN(child)->devfn);
|
|
of_node_put(child);
|
|
break;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|