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 <linux/slab.h> 56 #include "ibmasm.h" 57 #include "lowlevel.h" 58 #include "remote.h" 59 60 int ibmasm_debug = 0; 61 module_param(ibmasm_debug, int , S_IRUGO | S_IWUSR); 62 MODULE_PARM_DESC(ibmasm_debug, " Set debug mode on or off"); 63 64 65 static int ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id) 66 { 67 int result; 68 struct service_processor *sp; 69 70 if ((result = pci_enable_device(pdev))) { 71 dev_err(&pdev->dev, "Failed to enable PCI device\n"); 72 return result; 73 } 74 if ((result = pci_request_regions(pdev, DRIVER_NAME))) { 75 dev_err(&pdev->dev, "Failed to allocate PCI resources\n"); 76 goto error_resources; 77 } 78 /* vnc client won't work without bus-mastering */ 79 pci_set_master(pdev); 80 81 sp = kzalloc(sizeof(struct service_processor), GFP_KERNEL); 82 if (sp == NULL) { 83 dev_err(&pdev->dev, "Failed to allocate memory\n"); 84 result = -ENOMEM; 85 goto error_kmalloc; 86 } 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 result = ibmasm_event_buffer_init(sp); 98 if (result) { 99 dev_err(sp->dev, "Failed to allocate event buffer\n"); 100 goto error_eventbuffer; 101 } 102 103 result = ibmasm_heartbeat_init(sp); 104 if (result) { 105 dev_err(sp->dev, "Failed to allocate heartbeat command\n"); 106 goto error_heartbeat; 107 } 108 109 sp->irq = pdev->irq; 110 sp->base_address = pci_ioremap_bar(pdev, 0); 111 if (!sp->base_address) { 112 dev_err(sp->dev, "Failed to ioremap pci memory\n"); 113 result = -ENODEV; 114 goto error_ioremap; 115 } 116 117 result = request_irq(sp->irq, ibmasm_interrupt_handler, IRQF_SHARED, sp->devname, (void*)sp); 118 if (result) { 119 dev_err(sp->dev, "Failed to register interrupt handler\n"); 120 goto error_request_irq; 121 } 122 123 enable_sp_interrupts(sp->base_address); 124 125 result = ibmasm_init_remote_input_dev(sp); 126 if (result) { 127 dev_err(sp->dev, "Failed to initialize remote queue\n"); 128 goto error_send_message; 129 } 130 131 result = ibmasm_send_driver_vpd(sp); 132 if (result) { 133 dev_err(sp->dev, "Failed to send driver VPD to service processor\n"); 134 goto error_send_message; 135 } 136 result = ibmasm_send_os_state(sp, SYSTEM_STATE_OS_UP); 137 if (result) { 138 dev_err(sp->dev, "Failed to send OS state to service processor\n"); 139 goto error_send_message; 140 } 141 ibmasmfs_add_sp(sp); 142 143 ibmasm_register_uart(sp); 144 145 return 0; 146 147 error_send_message: 148 disable_sp_interrupts(sp->base_address); 149 ibmasm_free_remote_input_dev(sp); 150 free_irq(sp->irq, (void *)sp); 151 error_request_irq: 152 iounmap(sp->base_address); 153 error_ioremap: 154 ibmasm_heartbeat_exit(sp); 155 error_heartbeat: 156 ibmasm_event_buffer_exit(sp); 157 error_eventbuffer: 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 ibmasm_remove_one(struct pci_dev *pdev) 168 { 169 struct service_processor *sp = 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 response 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 kfree(sp); 187 pci_release_regions(pdev); 188 pci_disable_device(pdev); 189 } 190 191 static struct pci_device_id ibmasm_pci_table[] = 192 { 193 { PCI_DEVICE(VENDORID_IBM, DEVICEID_RSA) }, 194 {}, 195 }; 196 197 static struct pci_driver ibmasm_driver = { 198 .name = DRIVER_NAME, 199 .id_table = ibmasm_pci_table, 200 .probe = ibmasm_init_one, 201 .remove = ibmasm_remove_one, 202 }; 203 204 static void __exit ibmasm_exit (void) 205 { 206 ibmasm_unregister_panic_notifier(); 207 ibmasmfs_unregister(); 208 pci_unregister_driver(&ibmasm_driver); 209 info(DRIVER_DESC " version " DRIVER_VERSION " unloaded"); 210 } 211 212 static int __init ibmasm_init(void) 213 { 214 int result = pci_register_driver(&ibmasm_driver); 215 if (result) 216 return result; 217 218 result = ibmasmfs_register(); 219 if (result) { 220 pci_unregister_driver(&ibmasm_driver); 221 err("Failed to register ibmasmfs file system"); 222 return result; 223 } 224 225 ibmasm_register_panic_notifier(); 226 info(DRIVER_DESC " version " DRIVER_VERSION " loaded"); 227 return 0; 228 } 229 230 module_init(ibmasm_init); 231 module_exit(ibmasm_exit); 232 233 MODULE_AUTHOR(DRIVER_AUTHOR); 234 MODULE_DESCRIPTION(DRIVER_DESC); 235 MODULE_LICENSE("GPL"); 236 MODULE_DEVICE_TABLE(pci, ibmasm_pci_table); 237 238