drivers/misc/ibmasm/module.c

   1
   2 /*
   3  * IBM ASM Service Processor Device Driver
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  *
  19  * Copyright (C) IBM Corporation, 2004
  20  *
  21  * Author: Max Asböck <amax@us.ibm.com>
  22  *
  23  * This driver is based on code originally written by Pete Reynolds
  24  * and others.
  25  *
  26  */
  27
  28 /*
  29  * The ASM device driver does the following things:
  30  *
  31  * 1) When loaded it sends a message to the service processor,
  32  * indicating that an OS is * running. This causes the service processor
  33  * to send periodic heartbeats to the OS.
  34  *
  35  * 2) Answers the periodic heartbeats sent by the service processor.
  36  * Failure to do so would result in system reboot.
  37  *
  38  * 3) Acts as a pass through for dot commands sent from user applications.
  39  * The interface for this is the ibmasmfs file system.
  40  *
  41  * 4) Allows user applications to register for event notification. Events
  42  * are sent to the driver through interrupts. They can be read from user
  43  * space through the ibmasmfs file system.
  44  *
  45  * 5) Allows user space applications to send heartbeats to the service
  46  * processor (aka reverse heartbeats). Again this happens through ibmasmfs.
  47  *
  48  * 6) Handles remote mouse and keyboard event interrupts and makes them
  49  * available to user applications through ibmasmfs.
  50  *
  51  */
  52
  53 #include <linux/pci.h>
  54 #include <linux/init.h>
  55 #include "ibmasm.h"
  56 #include "lowlevel.h"
  57 #include "remote.h"
  58
  59
  60 static int __devinit ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
  61 {
  62         int err, result = -ENOMEM;
  63         struct service_processor *sp;
  64
  65         if ((err = pci_enable_device(pdev))) {
  66                 printk(KERN_ERR "%s: can't enable PCI device at %s\n",
  67                         DRIVER_NAME, pci_name(pdev));
  68                 return err;
  69         }
  70
  71         sp = kmalloc(sizeof(struct service_processor), GFP_KERNEL);
  72         if (sp == NULL) {
  73                 dev_err(&pdev->dev, "Failed to allocate memory\n");
  74                 result = -ENOMEM;
  75                 goto error_kmalloc;
  76         }
  77         memset(sp, 0, sizeof(struct service_processor));
  78
  79         pci_set_drvdata(pdev, (void *)sp);
  80         sp->dev = &pdev->dev;
  81         sp->number = pdev->bus->number;
  82         snprintf(sp->dirname, IBMASM_NAME_SIZE, "%d", sp->number);
  83         snprintf(sp->devname, IBMASM_NAME_SIZE, "%s%d", DRIVER_NAME, sp->number);
  84
  85         if (ibmasm_event_buffer_init(sp)) {
  86                 dev_err(sp->dev, "Failed to allocate event buffer\n");
  87                 goto error_eventbuffer;
  88         }
  89
  90         if (ibmasm_heartbeat_init(sp)) {
  91                 dev_err(sp->dev, "Failed to allocate heartbeat command\n");
  92                 goto error_heartbeat;
  93         }
  94
  95         sp->irq = pdev->irq;
  96         sp->base_address = ioremap(pci_resource_start(pdev, 0),
  97                                         pci_resource_len(pdev, 0));
  98         if (sp->base_address == 0) {
  99                 dev_err(sp->dev, "Failed to ioremap pci memory\n");
 100                 result =  -ENODEV;
 101                 goto error_ioremap;
 102         }
 103
 104         result = ibmasm_init_remote_queue(sp);
 105         if (result) {
 106                 dev_err(sp->dev, "Failed to initialize remote queue\n");
 107                 goto error_remote_queue;
 108         }
 109
 110         spin_lock_init(&sp->lock);
 111         INIT_LIST_HEAD(&sp->command_queue);
 112
 113         result = request_irq(sp->irq, ibmasm_interrupt_handler, SA_SHIRQ, sp->devname, (void*)sp);
 114         if (result) {
 115                 dev_err(sp->dev, "Failed to register interrupt handler\n");
 116                 goto error_request_irq;
 117         }
 118
 119         enable_sp_interrupts(sp->base_address);
 120         disable_mouse_interrupts(sp);
 121
 122         result = ibmasm_send_driver_vpd(sp);
 123         if (result) {
 124                 dev_err(sp->dev, "Failed to send driver VPD to service processor\n");
 125                 goto error_send_message;
 126         }
 127         result = ibmasm_send_os_state(sp, SYSTEM_STATE_OS_UP);
 128         if (result) {
 129                 dev_err(sp->dev, "Failed to send OS state to service processor\n");
 130                 goto error_send_message;
 131         }
 132         ibmasmfs_add_sp(sp);
 133
 134         ibmasm_register_uart(sp);
 135
 136         dev_printk(KERN_DEBUG, &pdev->dev, "WARNING: This software may not be supported or function\n");
 137         dev_printk(KERN_DEBUG, &pdev->dev, "correctly on your IBM server. Please consult the IBM\n");
 138         dev_printk(KERN_DEBUG, &pdev->dev, "ServerProven website\n");
 139         dev_printk(KERN_DEBUG, &pdev->dev, "http://www.pc.ibm.com/ww/eserver/xseries/serverproven\n");
 140         dev_printk(KERN_DEBUG, &pdev->dev, "for information on the specific driver level and support\n");
 141         dev_printk(KERN_DEBUG, &pdev->dev, "statement for your IBM server.\n");
 142
 143         return 0;
 144
 145 error_send_message:
 146         disable_sp_interrupts(sp->base_address);
 147         free_irq(sp->irq, (void *)sp);
 148 error_request_irq:
 149         ibmasm_free_remote_queue(sp);
 150 error_remote_queue:
 151         iounmap(sp->base_address);
 152 error_ioremap:
 153         ibmasm_heartbeat_exit(sp);
 154 error_heartbeat:
 155         ibmasm_event_buffer_exit(sp);
 156 error_eventbuffer:
 157         kfree(sp);
 158 error_kmalloc:
 159         pci_disable_device(pdev);
 160
 161         return result;
 162 }
 163
 164 static void __devexit ibmasm_remove_one(struct pci_dev *pdev)
 165 {
 166         struct service_processor *sp = (struct service_processor *)pci_get_drvdata(pdev);
 167
 168         ibmasm_unregister_uart(sp);
 169         ibmasm_send_os_state(sp, SYSTEM_STATE_OS_DOWN);
 170         disable_sp_interrupts(sp->base_address);
 171         disable_mouse_interrupts(sp);
 172         free_irq(sp->irq, (void *)sp);
 173         ibmasm_heartbeat_exit(sp);
 174         ibmasm_free_remote_queue(sp);
 175         iounmap(sp->base_address);
 176         ibmasm_event_buffer_exit(sp);
 177         kfree(sp);
 178         pci_disable_device(pdev);
 179 }
 180
 181 static struct pci_device_id ibmasm_pci_table[] =
 182 {
 183         { PCI_DEVICE(VENDORID_IBM, DEVICEID_RSA) },
 184         {},
 185 };
 186
 187 static struct pci_driver ibmasm_driver = {
 188         .name           = DRIVER_NAME,
 189         .id_table       = ibmasm_pci_table,
 190         .probe          = ibmasm_init_one,
 191         .remove         = __devexit_p(ibmasm_remove_one),
 192 };
 193
 194 static void __exit ibmasm_exit (void)
 195 {
 196         ibmasm_unregister_panic_notifier();
 197         ibmasmfs_unregister();
 198         pci_unregister_driver(&ibmasm_driver);
 199         info(DRIVER_DESC " version " DRIVER_VERSION " unloaded");
 200 }
 201
 202 static int __init ibmasm_init(void)
 203 {
 204         int result;
 205
 206         result = ibmasmfs_register();
 207         if (result) {
 208                 err("Failed to register ibmasmfs file system");
 209                 return result;
 210         }
 211         result = pci_register_driver(&ibmasm_driver);
 212         if (result) {
 213                 ibmasmfs_unregister();
 214                 return result;
 215         }
 216         ibmasm_register_panic_notifier();
 217         info(DRIVER_DESC " version " DRIVER_VERSION " loaded");
 218         return 0;
 219 }
 220
 221 module_init(ibmasm_init);
 222 module_exit(ibmasm_exit);
 223
 224 MODULE_AUTHOR(DRIVER_AUTHOR);
 225 MODULE_DESCRIPTION(DRIVER_DESC);
 226 MODULE_LICENSE("GPL");
 227 MODULE_DEVICE_TABLE(pci, ibmasm_pci_table);
 228