236 lines
6.4 KiB
C
236 lines
6.4 KiB
C
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/*
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* IBM ASM Service Processor Device Driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2004
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*
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* Author: Max Asböck <amax@us.ibm.com>
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*
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* This driver is based on code originally written by Pete Reynolds
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* and others.
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*
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*/
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/*
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* The ASM device driver does the following things:
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*
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* 1) When loaded it sends a message to the service processor,
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* indicating that an OS is * running. This causes the service processor
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* to send periodic heartbeats to the OS.
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*
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* 2) Answers the periodic heartbeats sent by the service processor.
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* Failure to do so would result in system reboot.
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*
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* 3) Acts as a pass through for dot commands sent from user applications.
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* The interface for this is the ibmasmfs file system.
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*
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* 4) Allows user applications to register for event notification. Events
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* are sent to the driver through interrupts. They can be read from user
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* space through the ibmasmfs file system.
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*
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* 5) Allows user space applications to send heartbeats to the service
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* processor (aka reverse heartbeats). Again this happens through ibmasmfs.
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*
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* 6) Handles remote mouse and keyboard event interrupts and makes them
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* available to user applications through ibmasmfs.
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*
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*/
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include "ibmasm.h"
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#include "lowlevel.h"
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#include "remote.h"
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int ibmasm_debug = 0;
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module_param(ibmasm_debug, int , S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(ibmasm_debug, " Set debug mode on or off");
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static int ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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int result;
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struct service_processor *sp;
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if ((result = pci_enable_device(pdev))) {
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dev_err(&pdev->dev, "Failed to enable PCI device\n");
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return result;
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}
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if ((result = pci_request_regions(pdev, DRIVER_NAME))) {
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dev_err(&pdev->dev, "Failed to allocate PCI resources\n");
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goto error_resources;
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}
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/* vnc client won't work without bus-mastering */
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pci_set_master(pdev);
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sp = kzalloc(sizeof(struct service_processor), GFP_KERNEL);
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if (sp == NULL) {
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dev_err(&pdev->dev, "Failed to allocate memory\n");
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result = -ENOMEM;
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goto error_kmalloc;
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}
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spin_lock_init(&sp->lock);
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INIT_LIST_HEAD(&sp->command_queue);
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pci_set_drvdata(pdev, (void *)sp);
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sp->dev = &pdev->dev;
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sp->number = pdev->bus->number;
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snprintf(sp->dirname, IBMASM_NAME_SIZE, "%d", sp->number);
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snprintf(sp->devname, IBMASM_NAME_SIZE, "%s%d", DRIVER_NAME, sp->number);
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if (ibmasm_event_buffer_init(sp)) {
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dev_err(sp->dev, "Failed to allocate event buffer\n");
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goto error_eventbuffer;
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}
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if (ibmasm_heartbeat_init(sp)) {
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dev_err(sp->dev, "Failed to allocate heartbeat command\n");
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goto error_heartbeat;
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}
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sp->irq = pdev->irq;
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sp->base_address = pci_ioremap_bar(pdev, 0);
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if (!sp->base_address) {
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dev_err(sp->dev, "Failed to ioremap pci memory\n");
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result = -ENODEV;
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goto error_ioremap;
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}
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result = request_irq(sp->irq, ibmasm_interrupt_handler, IRQF_SHARED, sp->devname, (void*)sp);
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if (result) {
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dev_err(sp->dev, "Failed to register interrupt handler\n");
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goto error_request_irq;
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}
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enable_sp_interrupts(sp->base_address);
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result = ibmasm_init_remote_input_dev(sp);
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if (result) {
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dev_err(sp->dev, "Failed to initialize remote queue\n");
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goto error_send_message;
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}
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result = ibmasm_send_driver_vpd(sp);
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if (result) {
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dev_err(sp->dev, "Failed to send driver VPD to service processor\n");
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goto error_send_message;
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}
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result = ibmasm_send_os_state(sp, SYSTEM_STATE_OS_UP);
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if (result) {
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dev_err(sp->dev, "Failed to send OS state to service processor\n");
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goto error_send_message;
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}
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ibmasmfs_add_sp(sp);
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ibmasm_register_uart(sp);
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return 0;
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error_send_message:
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disable_sp_interrupts(sp->base_address);
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ibmasm_free_remote_input_dev(sp);
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free_irq(sp->irq, (void *)sp);
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error_request_irq:
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iounmap(sp->base_address);
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error_ioremap:
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ibmasm_heartbeat_exit(sp);
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error_heartbeat:
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ibmasm_event_buffer_exit(sp);
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error_eventbuffer:
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kfree(sp);
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error_kmalloc:
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pci_release_regions(pdev);
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error_resources:
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pci_disable_device(pdev);
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return result;
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}
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static void ibmasm_remove_one(struct pci_dev *pdev)
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{
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struct service_processor *sp = pci_get_drvdata(pdev);
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dbg("Unregistering UART\n");
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ibmasm_unregister_uart(sp);
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dbg("Sending OS down message\n");
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if (ibmasm_send_os_state(sp, SYSTEM_STATE_OS_DOWN))
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err("failed to get response to 'Send OS State' command\n");
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dbg("Disabling heartbeats\n");
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ibmasm_heartbeat_exit(sp);
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dbg("Disabling interrupts\n");
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disable_sp_interrupts(sp->base_address);
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dbg("Freeing SP irq\n");
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free_irq(sp->irq, (void *)sp);
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dbg("Cleaning up\n");
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ibmasm_free_remote_input_dev(sp);
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iounmap(sp->base_address);
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ibmasm_event_buffer_exit(sp);
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kfree(sp);
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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}
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static struct pci_device_id ibmasm_pci_table[] =
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{
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{ PCI_DEVICE(VENDORID_IBM, DEVICEID_RSA) },
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{},
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};
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static struct pci_driver ibmasm_driver = {
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.name = DRIVER_NAME,
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.id_table = ibmasm_pci_table,
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.probe = ibmasm_init_one,
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.remove = ibmasm_remove_one,
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};
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static void __exit ibmasm_exit (void)
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{
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ibmasm_unregister_panic_notifier();
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ibmasmfs_unregister();
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pci_unregister_driver(&ibmasm_driver);
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info(DRIVER_DESC " version " DRIVER_VERSION " unloaded");
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}
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static int __init ibmasm_init(void)
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{
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int result = pci_register_driver(&ibmasm_driver);
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if (result)
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return result;
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result = ibmasmfs_register();
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if (result) {
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pci_unregister_driver(&ibmasm_driver);
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err("Failed to register ibmasmfs file system");
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return result;
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}
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ibmasm_register_panic_notifier();
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info(DRIVER_DESC " version " DRIVER_VERSION " loaded");
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return 0;
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}
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module_init(ibmasm_init);
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module_exit(ibmasm_exit);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, ibmasm_pci_table);
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