
/*
 * IBM ASM Service Processor Device Driver
 *
 * 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.  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) IBM Corporation, 2004
 *
 * Author: Max Asböck <amax@us.ibm.com> 
 *
 * This driver is based on code originally written by Pete Reynolds 
 * and others.
 *
 */

/*
 * The ASM device driver does the following things:
 *
 * 1) When loaded it sends a message to the service processor,
 * indicating that an OS is * running. This causes the service processor
 * to send periodic heartbeats to the OS. 
 *
 * 2) Answers the periodic heartbeats sent by the service processor.
 * Failure to do so would result in system reboot.
 *
 * 3) Acts as a pass through for dot commands sent from user applications.
 * The interface for this is the ibmasmfs file system. 
 *
 * 4) Allows user applications to register for event notification. Events
 * are sent to the driver through interrupts. They can be read from user
 * space through the ibmasmfs file system.
 *
 * 5) Allows user space applications to send heartbeats to the service
 * processor (aka reverse heartbeats). Again this happens through ibmasmfs.
 *
 * 6) Handles remote mouse and keyboard event interrupts and makes them
 * available to user applications through ibmasmfs.
 *
 */

#include <linux/pci.h>
#include <linux/init.h>
#include "ibmasm.h"
#include "lowlevel.h"
#include "remote.h"


static int __init ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
	int result = -ENOMEM;
	struct service_processor *sp;

	if (pci_enable_device(pdev)) {
		printk(KERN_ERR "%s: can't enable PCI device at %s\n",
			DRIVER_NAME, pci_name(pdev));
		return -ENODEV;
	}

	sp = kmalloc(sizeof(struct service_processor), GFP_KERNEL);
	if (sp == NULL) {
		dev_err(&pdev->dev, "Failed to allocate memory\n");
		result = -ENOMEM;
		goto error_kmalloc;
	}
	memset(sp, 0, sizeof(struct service_processor));

	pci_set_drvdata(pdev, (void *)sp);
	sp->dev = &pdev->dev;
	sp->number = pdev->bus->number;
	snprintf(sp->dirname, IBMASM_NAME_SIZE, "%d", sp->number);
	snprintf(sp->devname, IBMASM_NAME_SIZE, "%s%d", DRIVER_NAME, sp->number);

	if (ibmasm_event_buffer_init(sp)) {
		dev_err(sp->dev, "Failed to allocate event buffer\n");
		goto error_eventbuffer;
	}

	if (ibmasm_heartbeat_init(sp)) {
		dev_err(sp->dev, "Failed to allocate heartbeat command\n");
		goto error_heartbeat;
	}

	sp->irq = pdev->irq;
	sp->base_address = ioremap(pci_resource_start(pdev, 0), 
					pci_resource_len(pdev, 0));
	if (sp->base_address == 0) {
		dev_err(sp->dev, "Failed to ioremap pci memory\n");
		result =  -ENODEV;
		goto error_ioremap;
	}

	result = ibmasm_init_remote_queue(sp);
	if (result) {
		dev_err(sp->dev, "Failed to initialize remote queue\n");
		goto error_remote_queue;
	}

	sp->lock = SPIN_LOCK_UNLOCKED;
	INIT_LIST_HEAD(&sp->command_queue);

	result = request_irq(sp->irq, ibmasm_interrupt_handler, SA_SHIRQ, sp->devname, (void*)sp);
	if (result) {
		dev_err(sp->dev, "Failed to register interrupt handler\n");
		goto error_request_irq;
	}

	enable_sp_interrupts(sp->base_address);
	disable_mouse_interrupts(sp);

	result = ibmasm_send_driver_vpd(sp);
	if (result) {
		dev_err(sp->dev, "Failed to send driver VPD to service processor\n");
		goto error_send_message;
	}
	result = ibmasm_send_os_state(sp, SYSTEM_STATE_OS_UP);
	if (result) {
		dev_err(sp->dev, "Failed to send OS state to service processor\n");
		goto error_send_message;
	}
	ibmasmfs_add_sp(sp);

	ibmasm_register_uart(sp);

	dev_printk(KERN_DEBUG, &pdev->dev, "WARNING: This software may not be supported or function\n");
	dev_printk(KERN_DEBUG, &pdev->dev, "correctly on your IBM server. Please consult the IBM\n");
	dev_printk(KERN_DEBUG, &pdev->dev, "ServerProven website\n");
	dev_printk(KERN_DEBUG, &pdev->dev, "http://www.pc.ibm.com/ww/eserver/xseries/serverproven\n");
	dev_printk(KERN_DEBUG, &pdev->dev, "for information on the specific driver level and support\n");
	dev_printk(KERN_DEBUG, &pdev->dev, "statement for your IBM server.\n");

	return 0;

error_send_message:
	disable_sp_interrupts(sp->base_address);
	free_irq(sp->irq, (void *)sp);
error_request_irq:
	ibmasm_free_remote_queue(sp);
error_remote_queue:
	iounmap(sp->base_address);
error_ioremap:
	ibmasm_heartbeat_exit(sp);
error_heartbeat:
	ibmasm_event_buffer_exit(sp);
error_eventbuffer:
	kfree(sp);
error_kmalloc:
	pci_disable_device(pdev);

	return result;
}

static void __exit ibmasm_remove_one(struct pci_dev *pdev)
{
	struct service_processor *sp = (struct service_processor *)pci_get_drvdata(pdev);

	ibmasm_unregister_uart(sp);
	ibmasm_send_os_state(sp, SYSTEM_STATE_OS_DOWN);
	disable_sp_interrupts(sp->base_address);
	disable_mouse_interrupts(sp);
	free_irq(sp->irq, (void *)sp);
	ibmasm_heartbeat_exit(sp);
	ibmasm_free_remote_queue(sp);
	iounmap(sp->base_address);
	ibmasm_event_buffer_exit(sp);
	kfree(sp);
	pci_disable_device(pdev);
}

static struct pci_device_id ibmasm_pci_table[] =
{
	{ PCI_DEVICE(VENDORID_IBM, DEVICEID_RSA) },
	{},
};

static struct pci_driver ibmasm_driver = {
	.name		= DRIVER_NAME,
	.id_table	= ibmasm_pci_table,
	.probe		= ibmasm_init_one,
	.remove		= __devexit_p(ibmasm_remove_one),
};

static void __exit ibmasm_exit (void)
{
	ibmasm_unregister_panic_notifier();
	ibmasmfs_unregister();
	pci_unregister_driver(&ibmasm_driver);
	info(DRIVER_DESC " version " DRIVER_VERSION " unloaded");
}

static int __init ibmasm_init(void)
{
	int result;

	result = ibmasmfs_register();
	if (result) {
		err("Failed to register ibmasmfs file system");
		return result;
	}
	result = pci_register_driver(&ibmasm_driver);
	if (result <= 0) {
		pci_unregister_driver(&ibmasm_driver);
		ibmasmfs_unregister();
		return -ENODEV;
	}
	ibmasm_register_panic_notifier();
	info(DRIVER_DESC " version " DRIVER_VERSION " loaded");
	return 0;
}

module_init(ibmasm_init);
module_exit(ibmasm_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
