/*
* Standard Hot Plug Controller Driver
*
* Copyright (C) 1995,2001 Compaq Computer Corporation
* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001 IBM Corp.
* Copyright (C) 2003-2004 Intel Corporation
*
* 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 <greg@kroah.com>, <kristen.c.accardi@intel.com>
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/workqueue.h>
#include "shpchp.h"
/* Global variables */
int shpchp_debug;
int shpchp_poll_mode;
int shpchp_poll_time;
struct workqueue_struct *shpchp_wq;
#define DRIVER_VERSION "0.4"
#define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
#define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(shpchp_debug, bool, 0644);
module_param(shpchp_poll_mode, bool, 0644);
module_param(shpchp_poll_time, int, 0644);
MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
#define SHPC_MODULE_NAME "shpchp"
static int set_attention_status (struct hotplug_slot *slot, u8 value);
static int enable_slot (struct hotplug_slot *slot);
static int disable_slot (struct hotplug_slot *slot);
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_latch_status (struct hotplug_slot *slot, u8 *value);
static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
static int get_address (struct hotplug_slot *slot, u32 *value);
static int get_max_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
static int get_cur_bus_speed (struct hotplug_slot *slot, enum pci_bus_speed *value);
static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
.owner = THIS_MODULE,
.set_attention_status = set_attention_status,
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.get_power_status = get_power_status,
.get_attention_status = get_attention_status,
.get_latch_status = get_latch_status,
.get_adapter_status = get_adapter_status,
.get_address = get_address,
.get_max_bus_speed = get_max_bus_speed,
.get_cur_bus_speed = get_cur_bus_speed,
};
/**
* release_slot - free up the memory used by a slot
* @hotplug_slot: slot to free
*/
static void release_slot(struct hotplug_slot *hotplug_slot)
{
struct slot *slot = hotplug_slot->private;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
kfree(slot->hotplug_slot->info);
kfree(slot->hotplug_slot);
kfree(slot);
}
static void make_slot_name(struct slot *slot)
{
snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
slot->bus, slot->number);
}
static int
shpchprm_get_physical_slot_number(struct controller *ctrl, u32 *sun,
u8 busnum, u8 devnum)
{
int offset = devnum - ctrl->slot_device_offset;
dbg("%s: ctrl->slot_num_inc %d, offset %d\n", __FUNCTION__,
ctrl->slot_num_inc, offset);
*sun = (u8) (ctrl->first_slot + ctrl->slot_num_inc *offset);
return 0;
}
static int init_slots(struct controller *ctrl)
{
struct slot *slot;
struct hotplug_slot *hotplug_slot;
struct hotplug_slot_info *info;
int retval = -ENOMEM;
int i;
u32 sun;
for (i = 0; i < ctrl->num_slots; i++) {
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot)
goto error;
hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
if (!hotplug_slot)
goto error_slot;
slot->hotplug_slot = hotplug_slot;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
goto error_hpslot;
hotplug_slot->info = info;
hotplug_slot->name = slot->name;
slot->hp_slot = i;
slot->ctrl = ctrl;
slot->bus = ctrl->slot_bus;
slot->device = ctrl->slot_device_offset + i;
slot->hpc_ops = ctrl->hpc_ops;
mutex_init(&slot->lock);
if (shpchprm_get_physical_slot_number(ctrl, &sun,
slot->bus, slot->device))
goto error_info;
slot->number = sun;
INIT_WORK(&slot->work, queue_pushbutton_work, slot);
/* register this slot with the hotplug pci core */
hotplug_slot->private = slot;
hotplug_slot->release = &release_slot;
make_slot_name(slot);
hotplug_slot->ops = &shpchp_hotplug_slot_ops;
get_power_status(hotplug_slot, &info->power_status);
get_attention_status(hotplug_slot, &info->attention_status);
get_latch_status(hotplug_slot, &info->latch_status);
get_adapter_status(hotplug_slot, &info->adapter_status);
dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
"slot_device_offset=%x\n", slot->bus, slot->device,
slot->hp_slot, slot->number, ctrl->slot_device_offset);
retval = pci_hp_register(slot->hotplug_slot);
if (retval) {
err("pci_hp_register failed with error %d\n", retval);
goto error_info;
}
list_add(&slot->slot_list, &ctrl->slot_list);
}
return 0;
error_info:
kfree(info);
error_hpslot:
kfree(hotplug_slot);
error_slot:
kfree(slot);
error:
return retval;
}
void cleanup_slots(struct controller *ctrl)
{
struct list_head *tmp;
struct list_head *next;
struct slot *slot;
list_for_each_safe(tmp, next, &ctrl->slot_list) {
slot = list_entry(tmp, struct slot, slot_list);
list_del(&slot->slot_list);
cancel_delayed_work(&slot->work);
flush_scheduled_work();
flush_workqueue(shpchp_wq);
pci_hp_deregister(slot->hotplug_slot);
}
}
static int get_ctlr_slot_config(struct controller *ctrl)
{
int num_ctlr_slots;
int first_device_num;
int physical_slot_num;
int updown;
int rc;
int flags;
rc = shpc_get_ctlr_slot_config(ctrl, &num_ctlr_slots,
&first_device_num, &physical_slot_num,
&updown, &flags);
if (rc) {
err("%s: get_ctlr_slot_config fail for b:d (%x:%x)\n",
__FUNCTION__, ctrl->bus, ctrl->device);
return -1;
}
ctrl->num_slots = num_ctlr_slots;
ctrl->slot_device_offset = first_device_num;
ctrl->first_slot = physical_slot_num;
ctrl->slot_num_inc = updown; /* either -1 or 1 */
dbg("%s: num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d "
"(%x:%x)\n", __FUNCTION__, num_ctlr_slots, first_device_num,
physical_slot_num, updown, ctrl->bus, ctrl->device);
return 0;
}
/*
* set_attention_status - Turns the Amber LED for a slot on, off or blink
*/
static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
hotplug_slot->info->attention_status = status;
slot->hpc_ops->set_attention_status(slot, status);
return 0;
}
static int enable_slot (struct hotplug_slot *hotplug_slot)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
return shpchp_sysfs_enable_slot(slot);
}
static int disable_slot (struct hotplug_slot *hotplug_slot)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
return shpchp_sysfs_disable_slot(slot);
}
static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
retval = slot->hpc_ops->get_power_status(slot, value);
if (retval < 0)
*value = hotplug_slot->info->power_status;
return 0;
}
static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
retval = slot->hpc_ops->get_attention_status(slot, value);
if (retval < 0)
*value = hotplug_slot->info->attention_status;
return 0;
}
static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
retval = slot->hpc_ops->get_latch_status(slot, value);
if (retval < 0)
*value = hotplug_slot->info->latch_status;
return 0;
}
static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
retval = slot->hpc_ops->get_adapter_status(slot, value);
if (retval < 0)
*value = hotplug_slot->info->adapter_status;
return 0;
}
static int get_address (struct hotplug_slot *hotplug_slot, u32 *value)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
*value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;
return 0;
}
static int get_max_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
retval = slot->hpc_ops->get_max_bus_speed(slot, value);
if (retval < 0)
*value = PCI_SPEED_UNKNOWN;
return 0;
}
static int get_cur_bus_speed (struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
{
struct slot *slot = get_slot(hotplug_slot, __FUNCTION__);
int retval;
dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
if (retval < 0)
*value = PCI_SPEED_UNKNOWN;
return 0;
}
static int is_shpc_capable(struct pci_dev *dev)
{
if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
PCI_DEVICE_ID_AMD_GOLAM_7450))
return 1;
if (pci_find_capability(dev, PCI_CAP_ID_SHPC))
return 1;
return 0;
}
static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int rc;
struct controller *ctrl;
struct slot *t_slot;
int first_device_num; /* first PCI device number */
int num_ctlr_slots; /* number of slots implemented */
if (!is_shpc_capable(pdev))
return -ENODEV;
ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
if (!ctrl) {
err("%s : out of memory\n", __FUNCTION__);
goto err_out_none;
}
INIT_LIST_HEAD(&ctrl->slot_list);
rc = shpc_init(ctrl, pdev);
if (rc) {
dbg("%s: controller initialization failed\n",
SHPC_MODULE_NAME);
goto err_out_free_ctrl;
}
pci_set_drvdata(pdev, ctrl);
ctrl->bus = pdev->bus->number;
ctrl->slot_bus = pdev->subordinate->number;
ctrl->device = PCI_SLOT(pdev->devfn);
ctrl->function = PCI_FUNC(pdev->devfn);
dbg("ctrl bus=0x%x, device=%x, function=%x, irq=%x\n",
ctrl->bus, ctrl->device, ctrl->function, pdev->irq);
/*
* Save configuration headers for this and subordinate PCI buses
*/
rc = get_ctlr_slot_config(ctrl);
if (rc) {
err(msg_initialization_err, rc);
goto err_out_release_ctlr;
}
first_device_num = ctrl->slot_device_offset;
num_ctlr_slots = ctrl->num_slots;
ctrl->add_support = 1;
/* Setup the slot information structures */
rc = init_slots(ctrl);
if (rc) {
err(msg_initialization_err, 6);
goto err_out_release_ctlr;
}
/* Now hpc_functions (slot->hpc_ops->functions) are ready */
t_slot = shpchp_find_slot(ctrl, first_device_num);
/* Check for operation bus speed */
rc = t_slot->hpc_ops->get_cur_bus_speed(t_slot, &ctrl->speed);
dbg("%s: t_slot->hp_slot %x\n", __FUNCTION__,t_slot->hp_slot);
if (rc || ctrl->speed == PCI_SPEED_UNKNOWN) {
err(SHPC_MODULE_NAME ": Can't get current bus speed. "
"Set to 33MHz PCI.\n");
ctrl->speed = PCI_SPEED_33MHz;
}
rc = shpchp_create_ctrl_files(ctrl);
if (rc)
goto err_cleanup_slots;
return 0;
err_cleanup_slots:
cleanup_slots(ctrl);
err_out_release_ctlr:
ctrl->hpc_ops->release_ctlr(ctrl);
err_out_free_ctrl:
kfree(ctrl);
err_out_none:
return -ENODEV;
}
static void shpc_remove(struct pci_dev *dev)
{
struct controller *ctrl = pci_get_drvdata(dev);
shpchp_remove_ctrl_files(ctrl);
ctrl->hpc_ops->release_ctlr(ctrl);
kfree(ctrl);
}
static struct pci_device_id shpcd_pci_tbl[] = {
{PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
{ /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
static struct pci_driver shpc_driver = {
.name = SHPC_MODULE_NAME,
.id_table = shpcd_pci_tbl,
.probe = shpc_probe,
.remove = shpc_remove,
};
static int __init shpcd_init(void)
{
int retval = 0;
#ifdef CONFIG_HOTPLUG_PCI_SHPC_POLL_EVENT_MODE
shpchp_poll_mode = 1;
#endif
retval = pci_register_driver(&shpc_driver);
dbg("%s: pci_register_driver = %d\n", __FUNCTION__, retval);
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
return retval;
}
static void __exit shpcd_cleanup(void)
{
dbg("unload_shpchpd()\n");
pci_unregister_driver(&shpc_driver);
info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
}
module_init(shpcd_init);
module_exit(shpcd_cleanup);
