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 int ibmasm_debug = 0;
  60 module_param(ibmasm_debug, int , S_IRUGO | S_IWUSR);
  61 MODULE_PARM_DESC(ibmasm_debug, " Set debug mode on or off");
  62
  63
  64 static int __devinit ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
  65 {
  66         int result;
  67         struct service_processor *sp;
  68
  69         if ((result = pci_enable_device(pdev))) {
  70                 dev_err(&pdev->dev, "Failed to enable PCI device\n");
  71                 return result;
  72         }
  73         if ((result = pci_request_regions(pdev, DRIVER_NAME))) {
  74                 dev_err(&pdev->dev, "Failed to allocate PCI resources\n");
  75                 goto error_resources;
  76         }
  77         /* vnc client won't work without bus-mastering */
  78         pci_set_master(pdev);
  79
  80         sp = kmalloc(sizeof(struct service_processor), GFP_KERNEL);
  81         if (sp == NULL) {
  82                 dev_err(&pdev->dev, "Failed to allocate memory\n");
  83                 result = -ENOMEM;
  84                 goto error_kmalloc;
  85         }
  86         memset(sp, 0, sizeof(struct service_processor));
  87
  88         spin_lock_init(&sp->lock);
  89         INIT_LIST_HEAD(&sp->command_queue);
  90
  91         pci_set_drvdata(pdev, (void *)sp);
  92         sp->dev = &pdev->dev;
  93         sp->number = pdev->bus->number;
  94         snprintf(sp->dirname, IBMASM_NAME_SIZE, "%d", sp->number);
  95         snprintf(sp->devname, IBMASM_NAME_SIZE, "%s%d", DRIVER_NAME, sp->number);
  96
  97         if (ibmasm_event_buffer_init(sp)) {
  98                 dev_err(sp->dev, "Failed to allocate event buffer\n");
  99                 goto error_eventbuffer;
 100         }
 101
 102         if (ibmasm_heartbeat_init(sp)) {
 103                 dev_err(sp->dev, "Failed to allocate heartbeat command\n");
 104                 goto error_heartbeat;
 105         }
 106
 107         sp->irq = pdev->irq;
 108         sp->base_address = ioremap(pci_resource_start(pdev, 0),
 109                                         pci_resource_len(pdev, 0));
 110         if (sp->base_address == 0) {
 111                 dev_err(sp->dev, "Failed to ioremap pci memory\n");
 112                 result =  -ENODEV;
 113                 goto error_ioremap;
 114         }
 115
 116         result = request_irq(sp->irq, ibmasm_interrupt_handler, IRQF_SHARED, sp->devname, (void*)sp);
 117         if (result) {
 118                 dev_err(sp->dev, "Failed to register interrupt handler\n");
 119                 goto error_request_irq;
 120         }
 121
 122         enable_sp_interrupts(sp->base_address);
 123
 124         result = ibmasm_init_remote_input_dev(sp);
 125         if (result) {
 126                 dev_err(sp->dev, "Failed to initialize remote queue\n");
 127                 goto error_send_message;
 128         }
 129
 130         result = ibmasm_send_driver_vpd(sp);
 131         if (result) {
 132                 dev_err(sp->dev, "Failed to send driver VPD to service processor\n");
 133                 goto error_send_message;
 134         }
 135         result = ibmasm_send_os_state(sp, SYSTEM_STATE_OS_UP);
 136         if (result) {
 137                 dev_err(sp->dev, "Failed to send OS state to service processor\n");
 138                 goto error_send_message;
 139         }
 140         ibmasmfs_add_sp(sp);
 141
 142         ibmasm_register_uart(sp);
 143
 144         return 0;
 145
 146 error_send_message:
 147         disable_sp_interrupts(sp->base_address);
 148         ibmasm_free_remote_input_dev(sp);
 149         free_irq(sp->irq, (void *)sp);
 150 error_request_irq:
 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         pci_set_drvdata(pdev, NULL);
 158         kfree(sp);
 159 error_kmalloc:
 160         pci_release_regions(pdev);
 161 error_resources:
 162         pci_disable_device(pdev);
 163
 164         return result;
 165 }
 166
 167 static void __devexit ibmasm_remove_one(struct pci_dev *pdev)
 168 {
 169         struct service_processor *sp = (struct service_processor *)pci_get_drvdata(pdev);
 170
 171         dbg("Unregistering UART\n");
 172         ibmasm_unregister_uart(sp);
 173         dbg("Sending OS down message\n");
 174         if (ibmasm_send_os_state(sp, SYSTEM_STATE_OS_DOWN))
 175                 err("failed to get repsonse to 'Send OS State' command\n");
 176         dbg("Disabling heartbeats\n");
 177         ibmasm_heartbeat_exit(sp);
 178         dbg("Disabling interrupts\n");
 179         disable_sp_interrupts(sp->base_address);
 180         dbg("Freeing SP irq\n");
 181         free_irq(sp->irq, (void *)sp);
 182         dbg("Cleaning up\n");
 183         ibmasm_free_remote_input_dev(sp);
 184         iounmap(sp->base_address);
 185         ibmasm_event_buffer_exit(sp);
 186         pci_set_drvdata(pdev, NULL);
 187         kfree(sp);
 188         pci_release_regions(pdev);
 189         pci_disable_device(pdev);
 190 }
 191
 192 static struct pci_device_id ibmasm_pci_table[] =
 193 {
 194         { PCI_DEVICE(VENDORID_IBM, DEVICEID_RSA) },
 195         {},
 196 };
 197
 198 static struct pci_driver ibmasm_driver = {
 199         .name           = DRIVER_NAME,
 200         .id_table       = ibmasm_pci_table,
 201         .probe          = ibmasm_init_one,
 202         .remove         = __devexit_p(ibmasm_remove_one),
 203 };
 204
 205 static void __exit ibmasm_exit (void)
 206 {
 207         ibmasm_unregister_panic_notifier();
 208         ibmasmfs_unregister();
 209         pci_unregister_driver(&ibmasm_driver);
 210         info(DRIVER_DESC " version " DRIVER_VERSION " unloaded");
 211 }
 212
 213 static int __init ibmasm_init(void)
 214 {
 215         int result;
 216
 217         result = ibmasmfs_register();
 218         if (result) {
 219                 err("Failed to register ibmasmfs file system");
 220                 return result;
 221         }
 222         result = pci_register_driver(&ibmasm_driver);
 223         if (result) {
 224                 ibmasmfs_unregister();
 225                 return result;
 226         }
 227         ibmasm_register_panic_notifier();
 228         info(DRIVER_DESC " version " DRIVER_VERSION " loaded");
 229         return 0;
 230 }
 231
 232 module_init(ibmasm_init);
 233 module_exit(ibmasm_exit);
 234
 235 MODULE_AUTHOR(DRIVER_AUTHOR);
 236 MODULE_DESCRIPTION(DRIVER_DESC);
 237 MODULE_LICENSE("GPL");
 238 MODULE_DEVICE_TABLE(pci, ibmasm_pci_table);
 239