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/*

 * 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"

int ibmasm_debug = 0;

module_param(ibmasm_debug, int , S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(ibmasm_debug, " Set debug mode on or off");

static int __devinit ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)

{

        int result;

        struct service_processor *sp;

        if ((result = pci_enable_device(pdev))) {

                dev_err(&pdev->dev, "Failed to enable PCI device\n");

                return result;

        }

        if ((result = pci_request_regions(pdev, DRIVER_NAME))) {

                dev_err(&pdev->dev, "Failed to allocate PCI resources\n");

                goto error_resources;

        }

        /* vnc client won't work without bus-mastering */

        pci_set_master(pdev);

        sp = kzalloc(sizeof(struct service_processor), GFP_KERNEL);

        if (sp == NULL) {

                dev_err(&pdev->dev, "Failed to allocate memory\n");

                result = -ENOMEM;

                goto error_kmalloc;

        }

        spin_lock_init(&sp->lock);

        INIT_LIST_HEAD(&sp->command_queue);

        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 = request_irq(sp->irq, ibmasm_interrupt_handler, IRQF_SHARED, 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);

        result = ibmasm_init_remote_input_dev(sp);

        if (result) {

                dev_err(sp->dev, "Failed to initialize remote queue\n");

                goto error_send_message;

        }

        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);

        return 0;

error_send_message:

        disable_sp_interrupts(sp->base_address);

        ibmasm_free_remote_input_dev(sp);

        free_irq(sp->irq, (void *)sp);

error_request_irq:

        iounmap(sp->base_address);

error_ioremap:

        ibmasm_heartbeat_exit(sp);

error_heartbeat:

        ibmasm_event_buffer_exit(sp);

error_eventbuffer:

        pci_set_drvdata(pdev, NULL);

        kfree(sp);

error_kmalloc:

        pci_release_regions(pdev);

error_resources:

        pci_disable_device(pdev);

        return result;

}

static void __devexit ibmasm_remove_one(struct pci_dev *pdev)

{

        struct service_processor *sp = (struct service_processor *)pci_get_drvdata(pdev);

        dbg("Unregistering UART\n");

        ibmasm_unregister_uart(sp);

        dbg("Sending OS down message\n");

        if (ibmasm_send_os_state(sp, SYSTEM_STATE_OS_DOWN))

                err("failed to get repsonse to 'Send OS State' command\n");

        dbg("Disabling heartbeats\n");

        ibmasm_heartbeat_exit(sp);

        dbg("Disabling interrupts\n");

        disable_sp_interrupts(sp->base_address);

        dbg("Freeing SP irq\n");

        free_irq(sp->irq, (void *)sp);

        dbg("Cleaning up\n");

        ibmasm_free_remote_input_dev(sp);

        iounmap(sp->base_address);

        ibmasm_event_buffer_exit(sp);

        pci_set_drvdata(pdev, NULL);

        kfree(sp);

        pci_release_regions(pdev);

        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) {

                ibmasmfs_unregister();

                return result;

        }

        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");

MODULE_DEVICE_TABLE(pci, ibmasm_pci_table);