shpchp_core.c 10.7 KB
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/*
 * 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.
 *
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 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
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 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
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#include <linux/workqueue.h>
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#include "shpchp.h"

/* Global variables */
int shpchp_debug;
int shpchp_poll_mode;
int shpchp_poll_time;
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struct workqueue_struct *shpchp_wq;
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#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_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_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)
{
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	struct slot *slot = hotplug_slot->private;
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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	kfree(slot->hotplug_slot->info);
	kfree(slot->hotplug_slot);
	kfree(slot);
}

static int init_slots(struct controller *ctrl)
{
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	struct slot *slot;
	struct hotplug_slot *hotplug_slot;
	struct hotplug_slot_info *info;
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	char name[SLOT_NAME_SIZE];
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	int retval = -ENOMEM;
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	int i;
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	for (i = 0; i < ctrl->num_slots; i++) {
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		slot = kzalloc(sizeof(*slot), GFP_KERNEL);
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		if (!slot)
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			goto error;

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		hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
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		if (!hotplug_slot)
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			goto error_slot;
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		slot->hotplug_slot = hotplug_slot;
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		info = kzalloc(sizeof(*info), GFP_KERNEL);
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		if (!info)
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			goto error_hpslot;
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		hotplug_slot->info = info;

		slot->hp_slot = i;
		slot->ctrl = ctrl;
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		slot->bus = ctrl->pci_dev->subordinate->number;
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		slot->device = ctrl->slot_device_offset + i;
		slot->hpc_ops = ctrl->hpc_ops;
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		slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
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		mutex_init(&slot->lock);
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		INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
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		/* register this slot with the hotplug pci core */
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		hotplug_slot->private = slot;
		hotplug_slot->release = &release_slot;
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		snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
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		hotplug_slot->ops = &shpchp_hotplug_slot_ops;

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		ctrl_dbg(ctrl, "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);
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		retval = pci_hp_register(slot->hotplug_slot,
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				ctrl->pci_dev->subordinate, slot->device, name);
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		if (retval) {
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			ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
				 retval);
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			goto error_info;
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		}

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		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);

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		list_add(&slot->slot_list, &ctrl->slot_list);
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	}

	return 0;
error_info:
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	kfree(info);
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error_hpslot:
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	kfree(hotplug_slot);
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error_slot:
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	kfree(slot);
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error:
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	return retval;
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}

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void cleanup_slots(struct controller *ctrl)
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{
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	struct list_head *tmp;
	struct list_head *next;
	struct slot *slot;
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	list_for_each_safe(tmp, next, &ctrl->slot_list) {
		slot = list_entry(tmp, struct slot, slot_list);
		list_del(&slot->slot_list);
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		cancel_delayed_work(&slot->work);
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		flush_scheduled_work();
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		flush_workqueue(shpchp_wq);
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		pci_hp_deregister(slot->hotplug_slot);
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	}
}

/*
 * 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)
{
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	struct slot *slot = get_slot(hotplug_slot);
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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	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)
{
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	struct slot *slot = get_slot(hotplug_slot);
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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	return shpchp_sysfs_enable_slot(slot);
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}

static int disable_slot (struct hotplug_slot *hotplug_slot)
{
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	struct slot *slot = get_slot(hotplug_slot);
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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	return shpchp_sysfs_disable_slot(slot);
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}

static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
{
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	struct slot *slot = get_slot(hotplug_slot);
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	int retval;

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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	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)
{
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	struct slot *slot = get_slot(hotplug_slot);
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	int retval;

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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	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)
{
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	struct slot *slot = get_slot(hotplug_slot);
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	int retval;

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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	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)
{
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	struct slot *slot = get_slot(hotplug_slot);
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	int retval;

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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	retval = slot->hpc_ops->get_adapter_status(slot, value);
	if (retval < 0)
		*value = hotplug_slot->info->adapter_status;

	return 0;
}

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static int get_max_bus_speed(struct hotplug_slot *hotplug_slot,
				enum pci_bus_speed *value)
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{
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	struct slot *slot = get_slot(hotplug_slot);
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	int retval;

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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	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)
{
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	struct slot *slot = get_slot(hotplug_slot);
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	int retval;

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	ctrl_dbg(slot->ctrl, "%s - physical_slot = %s\n",
		 __func__, slot_name(slot));
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	retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
	if (retval < 0)
		*value = PCI_SPEED_UNKNOWN;

	return 0;
}

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static int is_shpc_capable(struct pci_dev *dev)
{
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	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 0;
	if (get_hp_hw_control_from_firmware(dev))
		return 0;
	return 1;
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}

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static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	int rc;
	struct controller *ctrl;

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	if (!is_shpc_capable(pdev))
		return -ENODEV;

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	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
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	if (!ctrl) {
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		dev_err(&pdev->dev, "%s : out of memory\n", __func__);
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		goto err_out_none;
	}
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	INIT_LIST_HEAD(&ctrl->slot_list);
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	rc = shpc_init(ctrl, pdev);
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	if (rc) {
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		ctrl_dbg(ctrl, "controller initialization failed\n");
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		goto err_out_free_ctrl;
	}

	pci_set_drvdata(pdev, ctrl);

	/* Setup the slot information structures */
	rc = init_slots(ctrl);
	if (rc) {
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		ctrl_err(ctrl, "slot initialization failed\n");
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		goto err_out_release_ctlr;
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	}

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	rc = shpchp_create_ctrl_files(ctrl);
	if (rc)
		goto err_cleanup_slots;
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	return 0;

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err_cleanup_slots:
	cleanup_slots(ctrl);
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err_out_release_ctlr:
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	ctrl->hpc_ops->release_ctlr(ctrl);
err_out_free_ctrl:
	kfree(ctrl);
err_out_none:
	return -ENODEV;
}

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static void shpc_remove(struct pci_dev *dev)
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{
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	struct controller *ctrl = pci_get_drvdata(dev);
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	shpchp_remove_ctrl_files(ctrl);
	ctrl->hpc_ops->release_ctlr(ctrl);
	kfree(ctrl);
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}

static struct pci_device_id shpcd_pci_tbl[] = {
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	{PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
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	{ /* 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,
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	.remove =	shpc_remove,
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};

static int __init shpcd_init(void)
{
	int retval = 0;

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	retval = pci_register_driver(&shpc_driver);
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	dbg("%s: pci_register_driver = %d\n", __func__, retval);
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	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
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	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);
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