pciehp_core.c

优龙2410linux2.6.8内核源代码

/*
 * PCI Express Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman ([e-mail])
 * 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 <[e-mail]>, <[e-mail]>
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include "pciehp.h"
#include "pciehprm.h"

/* Global variables */
int pciehp_debug;
int pciehp_poll_mode;
int pciehp_poll_time;
struct controller *pciehp_ctrl_list;
struct pci_func *pciehp_slot_list[256];

#define DRIVER_VERSION	"0.4"
#define DRIVER_AUTHOR	"Dan Zink <[e-mail]>, Greg Kroah-Hartman <[e-mail]>, Dely Sy <[e-mail]>"
#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, 644);
module_param(pciehp_poll_mode, bool, 644);
module_param(pciehp_poll_time, int, 644);
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");

#define PCIE_MODULE_NAME "pciehp"

static int pcie_start_thread (void);
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 = {
	.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_max_bus_speed =	get_max_bus_speed,
  	.get_cur_bus_speed =	get_cur_bus_speed,
};

static int init_slots(struct controller *ctrl)
{
	struct slot *new_slot;
	u8 number_of_slots;
	u8 slot_device;
	u32 slot_number;
	int result = -ENOMEM;

	dbg("%s\n",__FUNCTION__);

	number_of_slots = ctrl->num_slots;
	slot_device = ctrl->slot_device_offset;
	slot_number = ctrl->first_slot;

	while (number_of_slots) {
		new_slot = kmalloc(sizeof(*new_slot), GFP_KERNEL);
		if (!new_slot)
			goto error;

		memset(new_slot, 0, sizeof(struct slot));
		new_slot->hotplug_slot =
				kmalloc(sizeof(*(new_slot->hotplug_slot)),
						GFP_KERNEL);
		if (!new_slot->hotplug_slot)
			goto error_slot;
		memset(new_slot->hotplug_slot, 0, sizeof(struct hotplug_slot));

		new_slot->hotplug_slot->info =
			kmalloc(sizeof(*(new_slot->hotplug_slot->info)),
						GFP_KERNEL);
		if (!new_slot->hotplug_slot->info)
			goto error_hpslot;
		memset(new_slot->hotplug_slot->info, 0,
					sizeof(struct hotplug_slot_info));
		new_slot->hotplug_slot->name = kmalloc(SLOT_NAME_SIZE,
						GFP_KERNEL);
		if (!new_slot->hotplug_slot->name)
			goto error_info;

		new_slot->ctrl = ctrl;
		new_slot->bus = ctrl->slot_bus;
		new_slot->device = slot_device;
		new_slot->hpc_ops = ctrl->hpc_ops;

		new_slot->number = ctrl->first_slot;
		new_slot->hp_slot = slot_device - ctrl->slot_device_offset;

		/* register this slot with the hotplug pci core */
		new_slot->hotplug_slot->private = new_slot;
		make_slot_name (new_slot->hotplug_slot->name, SLOT_NAME_SIZE, new_slot);
		new_slot->hotplug_slot->ops = &pciehp_hotplug_slot_ops;

		new_slot->hpc_ops->get_power_status(new_slot, &(new_slot->hotplug_slot->info->power_status));
		new_slot->hpc_ops->get_attention_status(new_slot, &(new_slot->hotplug_slot->info->attention_status));
		new_slot->hpc_ops->get_latch_status(new_slot, &(new_slot->hotplug_slot->info->latch_status));
		new_slot->hpc_ops->get_adapter_status(new_slot, &(new_slot->hotplug_slot->info->adapter_status));

		dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x slot_device_offset=%x\n", 
			new_slot->bus, new_slot->device, new_slot->hp_slot, new_slot->number, ctrl->slot_device_offset);
		result = pci_hp_register (new_slot->hotplug_slot);
		if (result) {
			err ("pci_hp_register failed with error %d\n", result);
			goto error_name;
		}

		new_slot->next = ctrl->slot;
		ctrl->slot = new_slot;

		number_of_slots--;
		slot_device++;
		slot_number += ctrl->slot_num_inc;
	}

	return 0;

error_name:
	kfree(new_slot->hotplug_slot->name);
error_info:
	kfree(new_slot->hotplug_slot->info);
error_hpslot:
	kfree(new_slot->hotplug_slot);
error_slot:
	kfree(new_slot);
error:
	return result;
}


static int cleanup_slots (struct controller * ctrl)
{
	struct slot *old_slot, *next_slot;

	old_slot = ctrl->slot;
	ctrl->slot = NULL;

	while (old_slot) {
		next_slot = old_slot->next;
		pci_hp_deregister (old_slot->hotplug_slot);
		kfree(old_slot->hotplug_slot->info);
		kfree(old_slot->hotplug_slot->name);
		kfree(old_slot->hotplug_slot);
		kfree(old_slot);
		old_slot = next_slot;
	}


	return(0);
}

static int get_ctlr_slot_config(struct controller *ctrl)
{
	int num_ctlr_slots;		/* Not needed; PCI Express has 1 slot per port*/
	int first_device_num;		/* Not needed */
	int physical_slot_num;
	int updown;			/* Not needed */
	int rc;
	int flags;			/* Not needed */

	rc = pcie_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;	/* PCI Express has 1 slot per port */
	ctrl->slot_device_offset = first_device_num;
	ctrl->first_slot = physical_slot_num;
	ctrl->slot_num_inc = updown; 	/* Not needed */		/* either -1 or 1 */

	dbg("%s: bus(0x%x) num_slot(0x%x) 1st_dev(0x%x) psn(0x%x) updown(%d) for b:d (%x:%x)\n",
		__FUNCTION__, ctrl->slot_bus, 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 = hotplug_slot->private;

	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 = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	return pciehp_enable_slot(slot);
}


static int disable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	return pciehp_disable_slot(slot);
}

static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;
	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 = hotplug_slot->private;
	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 = hotplug_slot->private;
	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 = hotplug_slot->private;
	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;