drivers/misc/ibmasm/module.c - linux-mtk - Git at Google


 /*
  * 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 <linux/slab.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 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);

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

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

 	sp->irq = pdev->irq;
 	sp->base_address = pci_ioremap_bar(pdev, 0);
 	if (!sp->base_address) {
 		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:
 	kfree(sp);
 error_kmalloc:
         pci_release_regions(pdev);
 error_resources:
         pci_disable_device(pdev);

 	return result;
 }

 static void ibmasm_remove_one(struct pci_dev *pdev)
 {
 	struct service_processor *sp = 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 response 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);
 	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		= 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 = pci_register_driver(&ibmasm_driver);
 	if (result)
 		return result;

 	result = ibmasmfs_register();
 	if (result) {
 		pci_unregister_driver(&ibmasm_driver);
 		err("Failed to register ibmasmfs file system");
 		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);

	/*
	* 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 <linux/slab.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 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);

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

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

	sp->irq = pdev->irq;
	sp->base_address = pci_ioremap_bar(pdev, 0);
	if (!sp->base_address) {
	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:
	kfree(sp);
	error_kmalloc:
	pci_release_regions(pdev);
	error_resources:
	pci_disable_device(pdev);

	return result;
	}

	static void ibmasm_remove_one(struct pci_dev *pdev)
	{
	struct service_processor *sp = 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 response 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);
	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 = 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 = pci_register_driver(&ibmasm_driver);
	if (result)
	return result;

	result = ibmasmfs_register();
	if (result) {
	pci_unregister_driver(&ibmasm_driver);
	err("Failed to register ibmasmfs file system");
	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);