/*
* 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/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <asm/eeh.h> /* for eeh_add_device() */
#include <asm/rtas.h> /* rtas_call */
#include <asm/pci-bridge.h> /* for pci_controller */
#include "../pci.h" /* for pci_add_new_bus */
/* and pci_do_scan_bus */
#include "rpaphp.h"
#include "pci_hotplug.h"
int debug;
static struct semaphore rpaphp_sem;
LIST_HEAD(rpaphp_slot_head);
int num_slots;
#define DRIVER_VERSION "0.1"
#define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>"
#define DRIVER_DESC "RPA HOT Plug PCI Controller Driver"
#define MAX_LOC_CODE 128
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, 0644);
static int enable_slot(struct hotplug_slot *slot);
static int disable_slot(struct hotplug_slot *slot);
static int set_attention_status(struct hotplug_slot *slot, u8 value);
static int get_power_status(struct hotplug_slot *slot, u8 * value);
static int get_attention_status(struct hotplug_slot *slot, u8 * value);
static int get_adapter_status(struct hotplug_slot *slot, u8 * value);
static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value);
struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
.owner = THIS_MODULE,
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.set_attention_status = set_attention_status,
.get_power_status = get_power_status,
.get_attention_status = get_attention_status,
.get_adapter_status = get_adapter_status,
.get_max_bus_speed = get_max_bus_speed,
};
static int rpaphp_get_attention_status(struct slot *slot)
{
return slot->hotplug_slot->info->attention_status;
}
/**
* set_attention_status - set attention LED
* echo 0 > attention -- set LED OFF
* echo 1 > attention -- set LED ON
* echo 2 > attention -- set LED ID(identify, light is blinking)
*
*/
static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
{
int retval = 0;
struct slot *slot = (struct slot *)hotplug_slot->private;
down(&rpaphp_sem);
switch (value) {
case 0:
retval = rpaphp_set_attention_status(slot, LED_OFF);
hotplug_slot->info->attention_status = 0;
break;
case 1:
default:
retval = rpaphp_set_attention_status(slot, LED_ON);
hotplug_slot->info->attention_status = 1;
break;
case 2:
retval = rpaphp_set_attention_status(slot, LED_ID);
hotplug_slot->info->attention_status = 2;
break;
}
up(&rpaphp_sem);
return retval;
}
/**
* get_power_status - get power status of a slot
* @hotplug_slot: slot to get status
* @value: pointer to store status
*
*
*/
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
{
int retval;
struct slot *slot = (struct slot *)hotplug_slot->private;
down(&rpaphp_sem);
retval = rpaphp_get_power_status(slot, value);
up(&rpaphp_sem);
return retval;
}
/**
* get_attention_status - get attention LED status
*
*
*/
static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
{
int retval = 0;
struct slot *slot = (struct slot *)hotplug_slot->private;
down(&rpaphp_sem);
*value = rpaphp_get_attention_status(slot);
up(&rpaphp_sem);
return retval;
}
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
{
struct slot *slot = (struct slot *)hotplug_slot->private;
int retval = 0;
down(&rpaphp_sem);
retval = rpaphp_get_pci_adapter_status(slot, 0, value);
up(&rpaphp_sem);
return retval;
}
static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
{
struct slot *slot = (struct slot *)hotplug_slot->private;
down(&rpaphp_sem);
switch (slot->type) {
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
*value = PCI_SPEED_33MHz; /* speed for case 1-6 */
break;
case 7:
case 8:
*value = PCI_SPEED_66MHz;
break;
case 11:
case 14:
*value = PCI_SPEED_66MHz_PCIX;
break;
case 12:
case 15:
*value = PCI_SPEED_100MHz_PCIX;
break;
case 13:
case 16:
*value = PCI_SPEED_133MHz_PCIX;
break;
default:
*value = PCI_SPEED_UNKNOWN;
break;
}
up(&rpaphp_sem);
return 0;
}
int rpaphp_remove_slot(struct slot *slot)
{
return deregister_slot(slot);
}
static int get_children_props(struct device_node *dn, int **drc_indexes,
int **drc_names, int **drc_types, int **drc_power_domains)
{
int *indexes, *names;
int *types, *domains;
indexes = (int *) get_property(dn, "ibm,drc-indexes", NULL);
names = (int *) get_property(dn, "ibm,drc-names", NULL);
types = (int *) get_property(dn, "ibm,drc-types", NULL);
domains = (int *) get_property(dn, "ibm,drc-power-domains", NULL);
if (!indexes || !names || !types || !domains) {
/* Slot does not have dynamically-removable children */
return -EINVAL;
}
if (drc_indexes)
*drc_indexes = indexes;
if (drc_names)
/* &drc_names[1] contains NULL terminated slot names */
*drc_names = names;
if (drc_types)
/* &drc_types[1] contains NULL terminated slot types */
*drc_types = types;
if (drc_power_domains)
*drc_power_domains = domains;
return 0;
}
/* To get the DRC props describing the current node, first obtain it's
* my-drc-index property. Next obtain the DRC list from it's parent. Use
* the my-drc-index for correlation, and obtain the requested properties.
*/
int rpaphp_get_drc_props(struct device_node *dn, int *drc_index,
char **drc_name, char **drc_type, int *drc_power_domain)
{
int *indexes, *names;
int *types, *domains;
unsigned int *my_index;
char *name_tmp, *type_tmp;
int i, rc;
my_index = (int *) get_property(dn, "ibm,my-drc-index", NULL);
if (!my_index) {
/* Node isn't DLPAR/hotplug capable */
return -EINVAL;
}
rc = get_children_props(dn->parent, &indexes, &names, &types, &domains);
if (rc < 0) {
return -EINVAL;
}
name_tmp = (char *) &names[1];
type_tmp = (char *) &types[1];
/* Iterate through parent properties, looking for my-drc-index */
for (i = 0; i < indexes[0]; i++) {
if ((unsigned int) indexes[i + 1] == *my_index) {
if (drc_name)
*drc_name = name_tmp;
if (drc_type)
*drc_type = type_tmp;
if (drc_index)
*drc_index = *my_index;
if (drc_power_domain)
*drc_power_domain = domains[i+1];
return 0;
}
name_tmp += (strlen(name_tmp) + 1);
type_tmp += (strlen(type_tmp) + 1);
}
return -EINVAL;
}
static int is_php_type(char *drc_type)
{
unsigned long value;
char *endptr;
/* PCI Hotplug nodes have an integer for drc_type */
value = simple_strtoul(drc_type, &endptr, 10);
if (endptr == drc_type)
return 0;
return 1;
}
static int is_php_dn(struct device_node *dn, int **indexes, int **names,
int **types, int **power_domains)
{
int *drc_types;
int rc;
rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
if (rc >= 0) {
if (is_php_type((char *) &drc_types[1])) {
*types = drc_types;
return 1;
}
}
return 0;
}
/****************************************************************
* rpaphp not only registers PCI hotplug slots(HOTPLUG),
* but also logical DR slots(EMBEDDED).
* HOTPLUG slot: An adapter can be physically added/removed.
* EMBEDDED slot: An adapter can be logically removed/added
* from/to a partition with the slot.
***************************************************************/
int rpaphp_add_slot(struct device_node *dn)
{
struct slot *slot;
int retval = 0;
int i;
int *indexes, *names, *types, *power_domains;
char *name, *type;
dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name);
/* register PCI devices */
if (dn->name != 0 && strcmp(dn->name, "pci") == 0) {
if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
goto exit;
name = (char *) &names[1];
type = (char *) &types[1];
for (i = 0; i < indexes[0]; i++,
name += (strlen(name) + 1), type += (strlen(type) + 1)) {
if (!(slot = alloc_slot_struct(dn, indexes[i + 1], name,
power_domains[i + 1]))) {
retval = -ENOMEM;
goto exit;
}
slot->type = simple_strtoul(type, NULL, 10);
dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
indexes[i + 1], name, type);
retval = register_pci_slot(slot);
}
}
exit:
dbg("%s - Exit: num_slots=%d rc[%d]\n",
__FUNCTION__, num_slots, retval);
return retval;
}
static void __exit cleanup_slots(void)
{
struct list_head *tmp, *n;
struct slot *slot;
/*
* Unregister all of our slots with the pci_hotplug subsystem,
* and free up all memory that we had allocated.
* memory will be freed in release_slot callback.
*/
list_for_each_safe(tmp, n, &rpaphp_slot_head) {
slot = list_entry(tmp, struct slot, rpaphp_slot_list);
list_del(&slot->rpaphp_slot_list);
pci_hp_deregister(slot->hotplug_slot);
}
return;
}
static int __init rpaphp_init(void)
{
struct device_node *dn = NULL;
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
init_MUTEX(&rpaphp_sem);
while ((dn = of_find_node_by_type(dn, "pci")))
rpaphp_add_slot(dn);
if (!num_slots)
return -ENODEV;
return 0;
}
static void __exit rpaphp_exit(void)
{
cleanup_slots();
}
static int enable_slot(struct hotplug_slot *hotplug_slot)
{
int retval = 0;
struct slot *slot = (struct slot *)hotplug_slot->private;
if (slot->state == CONFIGURED) {
dbg("%s: %s is already enabled\n", __FUNCTION__, slot->name);
goto exit;
}
dbg("ENABLING SLOT %s\n", slot->name);
down(&rpaphp_sem);
retval = rpaphp_enable_pci_slot(slot);
up(&rpaphp_sem);
exit:
dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval);
return retval;
}
static int __disable_slot(struct slot *slot)
{
struct pci_dev *dev, *tmp;
if (slot->state == NOT_CONFIGURED)
return -EINVAL;
list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) {
eeh_remove_bus_device(dev);
pci_remove_bus_device(dev);
}
slot->state = NOT_CONFIGURED;
return 0;
}
static int disable_slot(struct hotplug_slot *hotplug_slot)
{
struct slot *slot = (struct slot *)hotplug_slot->private;
int retval;
down(&rpaphp_sem);
retval = __disable_slot (slot);
up(&rpaphp_sem);
return retval;
}
module_init(rpaphp_init);
module_exit(rpaphp_exit);
EXPORT_SYMBOL_GPL(rpaphp_add_slot);
EXPORT_SYMBOL_GPL(rpaphp_remove_slot);
EXPORT_SYMBOL_GPL(rpaphp_slot_head);
EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
