/*
* PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
* Copyright (C) 2003 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/pci.h>
#include <linux/string.h>
#include <asm/pci-bridge.h>
#include <asm/rtas.h>
#include <asm/machdep.h>
#include "../pci.h" /* for pci_add_new_bus */
#include "rpaphp.h"
static int rpaphp_get_sensor_state(struct slot *slot, int *state)
{
int rc;
int setlevel;
rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
if (rc < 0) {
if (rc == -EFAULT || rc == -EEXIST) {
dbg("%s: slot must be power up to get sensor-state\n",
__FUNCTION__);
/* some slots have to be powered up
* before get-sensor will succeed.
*/
rc = rtas_set_power_level(slot->power_domain, POWER_ON,
&setlevel);
if (rc < 0) {
dbg("%s: power on slot[%s] failed rc=%d.\n",
__FUNCTION__, slot->name, rc);
} else {
rc = rtas_get_sensor(DR_ENTITY_SENSE,
slot->index, state);
}
} else if (rc == -ENODEV)
info("%s: slot is unusable\n", __FUNCTION__);
else
err("%s failed to get sensor state\n", __FUNCTION__);
}
return rc;
}
/**
* get_pci_adapter_status - get the status of a slot
*
* 0-- slot is empty
* 1-- adapter is configured
* 2-- adapter is not configured
* 3-- not valid
*/
int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
{
struct pci_bus *bus;
int state, rc;
*value = NOT_VALID;
rc = rpaphp_get_sensor_state(slot, &state);
if (rc)
goto exit;
if (state == EMPTY)
*value = EMPTY;
else if (state == PRESENT) {
if (!is_init) {
/* at run-time slot->state can be changed by */
/* config/unconfig adapter */
*value = slot->state;
} else {
bus = pcibios_find_pci_bus(slot->dn);
if (bus && !list_empty(&bus->devices))
*value = CONFIGURED;
else
*value = NOT_CONFIGURED;
}
}
exit:
return rc;
}
static void print_slot_pci_funcs(struct pci_bus *bus)
{
struct device_node *dn;
struct pci_dev *dev;
dn = pci_bus_to_OF_node(bus);
if (!dn)
return;
dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
list_for_each_entry (dev, &bus->devices, bus_list)
dbg("\t%s\n", pci_name(dev));
return;
}
static int setup_pci_hotplug_slot_info(struct slot *slot)
{
struct hotplug_slot_info *hotplug_slot_info = slot->hotplug_slot->info;
dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
__FUNCTION__);
rpaphp_get_power_status(slot, &hotplug_slot_info->power_status);
rpaphp_get_pci_adapter_status(slot, 1,
&hotplug_slot_info->adapter_status);
if (hotplug_slot_info->adapter_status == NOT_VALID) {
err("%s: NOT_VALID: skip dn->full_name=%s\n",
__FUNCTION__, slot->dn->full_name);
return -EINVAL;
}
return 0;
}
static void set_slot_name(struct slot *slot)
{
struct pci_bus *bus = slot->bus;
struct pci_dev *bridge;
bridge = bus->self;
if (bridge)
strcpy(slot->name, pci_name(bridge));
else
sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
bus->number);
}
static int setup_pci_slot(struct slot *slot)
{
struct device_node *dn = slot->dn;
struct pci_bus *bus;
BUG_ON(!dn);
bus = pcibios_find_pci_bus(dn);
if (!bus) {
err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
goto exit_rc;
}
slot->bus = bus;
slot->pci_devs = &bus->devices;
set_slot_name(slot);
/* find slot's pci_dev if it's not empty */
if (slot->hotplug_slot->info->adapter_status == EMPTY) {
slot->state = EMPTY; /* slot is empty */
} else {
/* slot is occupied */
if (!dn->child) {
/* non-empty slot has to have child */
err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
__FUNCTION__, slot->name);
goto exit_rc;
}
if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
dbg("%s CONFIGURING pci adapter in slot[%s]\n",
__FUNCTION__, slot->name);
pcibios_add_pci_devices(slot->bus);
} else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
__FUNCTION__, slot->name);
goto exit_rc;
}
print_slot_pci_funcs(slot->bus);
if (!list_empty(slot->pci_devs)) {
slot->state = CONFIGURED;
} else {
/* DLPAR add as opposed to
* boot time */
slot->state = NOT_CONFIGURED;
}
}
return 0;
exit_rc:
dealloc_slot_struct(slot);
return -EINVAL;
}
int register_pci_slot(struct slot *slot)
{
int rc = -EINVAL;
if (setup_pci_hotplug_slot_info(slot))
goto exit_rc;
if (setup_pci_slot(slot))
goto exit_rc;
rc = register_slot(slot);
exit_rc:
return rc;
}
int rpaphp_enable_pci_slot(struct slot *slot)
{
int retval = 0, state;
retval = rpaphp_get_sensor_state(slot, &state);
if (retval)
goto exit;
dbg("%s: sensor state[%d]\n", __FUNCTION__, state);
/* if slot is not empty, enable the adapter */
if (state == PRESENT) {
dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name);
pcibios_add_pci_devices(slot->bus);
slot->state = CONFIGURED;
info("%s: devices in slot[%s] configured\n",
__FUNCTION__, slot->name);
} else if (state == EMPTY) {
dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name);
slot->state = EMPTY;
} else {
err("%s: slot[%s] is in invalid state\n", __FUNCTION__,
slot->name);
slot->state = NOT_VALID;
retval = -EINVAL;
}
exit:
dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
return retval;
}
