forked from Minki/linux
8720d27dab
Since PCIe downstream port has only one slot at most, we don't need 'slot_list' linked list to manage multiple slots under the port. Acked-by: Alex Chiang <achiang@hp.com> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
428 lines
11 KiB
C
428 lines
11 KiB
C
/*
|
|
* PCI Express 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 "pciehp.h"
|
|
#include <linux/interrupt.h>
|
|
#include <linux/time.h>
|
|
|
|
/* Global variables */
|
|
int pciehp_debug;
|
|
int pciehp_poll_mode;
|
|
int pciehp_poll_time;
|
|
int pciehp_force;
|
|
struct workqueue_struct *pciehp_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 "PCI Express Hot Plug Controller Driver"
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(pciehp_debug, bool, 0644);
|
|
module_param(pciehp_poll_mode, bool, 0644);
|
|
module_param(pciehp_poll_time, int, 0644);
|
|
module_param(pciehp_force, bool, 0644);
|
|
MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
|
|
MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
|
|
MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
|
|
MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
|
|
|
|
#define PCIE_MODULE_NAME "pciehp"
|
|
|
|
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_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 pciehp_hotplug_slot_ops = {
|
|
.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_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;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, hotplug_slot_name(hotplug_slot));
|
|
|
|
kfree(hotplug_slot->info);
|
|
kfree(hotplug_slot);
|
|
}
|
|
|
|
static int init_slot(struct controller *ctrl)
|
|
{
|
|
struct slot *slot = ctrl->slot;
|
|
struct hotplug_slot *hotplug = NULL;
|
|
struct hotplug_slot_info *info = NULL;
|
|
char name[SLOT_NAME_SIZE];
|
|
int retval = -ENOMEM;
|
|
|
|
hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
|
|
if (!hotplug)
|
|
goto out;
|
|
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
|
if (!info)
|
|
goto out;
|
|
|
|
/* register this slot with the hotplug pci core */
|
|
hotplug->info = info;
|
|
hotplug->private = slot;
|
|
hotplug->release = &release_slot;
|
|
hotplug->ops = &pciehp_hotplug_slot_ops;
|
|
slot->hotplug_slot = hotplug;
|
|
snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
|
|
|
|
ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
|
|
"hp_slot=%x sun=%x slot_device_offset=%x\n",
|
|
pci_domain_nr(ctrl->pci_dev->subordinate),
|
|
slot->bus, slot->device, slot->hp_slot, slot->number,
|
|
ctrl->slot_device_offset);
|
|
retval = pci_hp_register(hotplug,
|
|
ctrl->pci_dev->subordinate,
|
|
slot->device,
|
|
name);
|
|
if (retval) {
|
|
ctrl_err(ctrl,
|
|
"pci_hp_register failed with error %d\n", retval);
|
|
goto out;
|
|
}
|
|
get_power_status(hotplug, &info->power_status);
|
|
get_attention_status(hotplug, &info->attention_status);
|
|
get_latch_status(hotplug, &info->latch_status);
|
|
get_adapter_status(hotplug, &info->adapter_status);
|
|
out:
|
|
if (retval) {
|
|
kfree(info);
|
|
kfree(hotplug);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static void cleanup_slot(struct controller *ctrl)
|
|
{
|
|
pci_hp_deregister(ctrl->slot->hotplug_slot);
|
|
}
|
|
|
|
/*
|
|
* 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 = hotplug_slot->private;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
hotplug_slot->info->attention_status = status;
|
|
|
|
if (ATTN_LED(slot->ctrl))
|
|
slot->hpc_ops->set_attention_status(slot, status);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int enable_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
return pciehp_sysfs_enable_slot(slot);
|
|
}
|
|
|
|
|
|
static int disable_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
return pciehp_sysfs_disable_slot(slot);
|
|
}
|
|
|
|
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
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 = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
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 = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
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 = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
retval = slot->hpc_ops->get_adapter_status(slot, value);
|
|
if (retval < 0)
|
|
*value = hotplug_slot->info->adapter_status;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
|
|
enum pci_bus_speed *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
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 = hotplug_slot->private;
|
|
int retval;
|
|
|
|
ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
|
|
__func__, slot_name(slot));
|
|
|
|
retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
|
|
if (retval < 0)
|
|
*value = PCI_SPEED_UNKNOWN;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pciehp_probe(struct pcie_device *dev)
|
|
{
|
|
int rc;
|
|
struct controller *ctrl;
|
|
struct slot *slot;
|
|
u8 value;
|
|
struct pci_dev *pdev = dev->port;
|
|
|
|
if (pciehp_force)
|
|
dev_info(&dev->device,
|
|
"Bypassing BIOS check for pciehp use on %s\n",
|
|
pci_name(pdev));
|
|
else if (pciehp_get_hp_hw_control_from_firmware(pdev))
|
|
goto err_out_none;
|
|
|
|
ctrl = pcie_init(dev);
|
|
if (!ctrl) {
|
|
dev_err(&dev->device, "Controller initialization failed\n");
|
|
goto err_out_none;
|
|
}
|
|
set_service_data(dev, ctrl);
|
|
|
|
/* Setup the slot information structures */
|
|
rc = init_slot(ctrl);
|
|
if (rc) {
|
|
if (rc == -EBUSY)
|
|
ctrl_warn(ctrl, "Slot already registered by another "
|
|
"hotplug driver\n");
|
|
else
|
|
ctrl_err(ctrl, "Slot initialization failed\n");
|
|
goto err_out_release_ctlr;
|
|
}
|
|
|
|
/* Enable events after we have setup the data structures */
|
|
rc = pcie_init_notification(ctrl);
|
|
if (rc) {
|
|
ctrl_err(ctrl, "Notification initialization failed\n");
|
|
goto err_out_release_ctlr;
|
|
}
|
|
|
|
/* Check if slot is occupied */
|
|
slot = ctrl->slot;
|
|
slot->hpc_ops->get_adapter_status(slot, &value);
|
|
if (value) {
|
|
if (pciehp_force)
|
|
pciehp_enable_slot(slot);
|
|
} else {
|
|
/* Power off slot if not occupied */
|
|
if (POWER_CTRL(ctrl)) {
|
|
rc = slot->hpc_ops->power_off_slot(slot);
|
|
if (rc)
|
|
goto err_out_free_ctrl_slot;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_out_free_ctrl_slot:
|
|
cleanup_slot(ctrl);
|
|
err_out_release_ctlr:
|
|
ctrl->hpc_ops->release_ctlr(ctrl);
|
|
err_out_none:
|
|
return -ENODEV;
|
|
}
|
|
|
|
static void pciehp_remove (struct pcie_device *dev)
|
|
{
|
|
struct controller *ctrl = get_service_data(dev);
|
|
|
|
cleanup_slot(ctrl);
|
|
ctrl->hpc_ops->release_ctlr(ctrl);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int pciehp_suspend (struct pcie_device *dev)
|
|
{
|
|
dev_info(&dev->device, "%s ENTRY\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
static int pciehp_resume (struct pcie_device *dev)
|
|
{
|
|
dev_info(&dev->device, "%s ENTRY\n", __func__);
|
|
if (pciehp_force) {
|
|
struct controller *ctrl = get_service_data(dev);
|
|
struct slot *slot;
|
|
u8 status;
|
|
|
|
/* reinitialize the chipset's event detection logic */
|
|
pcie_enable_notification(ctrl);
|
|
|
|
slot = ctrl->slot;
|
|
|
|
/* Check if slot is occupied */
|
|
slot->hpc_ops->get_adapter_status(slot, &status);
|
|
if (status)
|
|
pciehp_enable_slot(slot);
|
|
else
|
|
pciehp_disable_slot(slot);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* PM */
|
|
|
|
static struct pcie_port_service_driver hpdriver_portdrv = {
|
|
.name = PCIE_MODULE_NAME,
|
|
.port_type = PCIE_ANY_PORT,
|
|
.service = PCIE_PORT_SERVICE_HP,
|
|
|
|
.probe = pciehp_probe,
|
|
.remove = pciehp_remove,
|
|
|
|
#ifdef CONFIG_PM
|
|
.suspend = pciehp_suspend,
|
|
.resume = pciehp_resume,
|
|
#endif /* PM */
|
|
};
|
|
|
|
static int __init pcied_init(void)
|
|
{
|
|
int retval = 0;
|
|
|
|
pciehp_firmware_init();
|
|
retval = pcie_port_service_register(&hpdriver_portdrv);
|
|
dbg("pcie_port_service_register = %d\n", retval);
|
|
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
|
|
if (retval)
|
|
dbg("Failure to register service\n");
|
|
return retval;
|
|
}
|
|
|
|
static void __exit pcied_cleanup(void)
|
|
{
|
|
dbg("unload_pciehpd()\n");
|
|
pcie_port_service_unregister(&hpdriver_portdrv);
|
|
info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
|
|
}
|
|
|
|
module_init(pcied_init);
|
|
module_exit(pcied_cleanup);
|