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 ibmasm_init_one(struct pci_dev * pdev,const struct pci_device_id * id)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 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 = pci_ioremap_bar(pdev, 0); 109 if (!sp->base_address) { 110 dev_err(sp->dev, "Failed to ioremap pci memory\n"); 111 result = -ENODEV; 112 goto error_ioremap; 113 } 114 115 result = request_irq(sp->irq, ibmasm_interrupt_handler, IRQF_SHARED, sp->devname, (void*)sp); 116 if (result) { 117 dev_err(sp->dev, "Failed to register interrupt handler\n"); 118 goto error_request_irq; 119 } 120 121 enable_sp_interrupts(sp->base_address); 122 123 result = ibmasm_init_remote_input_dev(sp); 124 if (result) { 125 dev_err(sp->dev, "Failed to initialize remote queue\n"); 126 goto error_send_message; 127 } 128 129 result = ibmasm_send_driver_vpd(sp); 130 if (result) { 131 dev_err(sp->dev, "Failed to send driver VPD to service processor\n"); 132 goto error_send_message; 133 } 134 result = ibmasm_send_os_state(sp, SYSTEM_STATE_OS_UP); 135 if (result) { 136 dev_err(sp->dev, "Failed to send OS state to service processor\n"); 137 goto error_send_message; 138 } 139 ibmasmfs_add_sp(sp); 140 141 ibmasm_register_uart(sp); 142 143 return 0; 144 145 error_send_message: 146 disable_sp_interrupts(sp->base_address); 147 ibmasm_free_remote_input_dev(sp); 148 free_irq(sp->irq, (void *)sp); 149 error_request_irq: 150 iounmap(sp->base_address); 151 error_ioremap: 152 ibmasm_heartbeat_exit(sp); 153 error_heartbeat: 154 ibmasm_event_buffer_exit(sp); 155 error_eventbuffer: 156 kfree(sp); 157 error_kmalloc: 158 pci_release_regions(pdev); 159 error_resources: 160 pci_disable_device(pdev); 161 162 return result; 163 } 164 ibmasm_remove_one(struct pci_dev * pdev)165 static void ibmasm_remove_one(struct pci_dev *pdev) 166 { 167 struct service_processor *sp = pci_get_drvdata(pdev); 168 169 dbg("Unregistering UART\n"); 170 ibmasm_unregister_uart(sp); 171 dbg("Sending OS down message\n"); 172 if (ibmasm_send_os_state(sp, SYSTEM_STATE_OS_DOWN)) 173 err("failed to get response to 'Send OS State' command\n"); 174 dbg("Disabling heartbeats\n"); 175 ibmasm_heartbeat_exit(sp); 176 dbg("Disabling interrupts\n"); 177 disable_sp_interrupts(sp->base_address); 178 dbg("Freeing SP irq\n"); 179 free_irq(sp->irq, (void *)sp); 180 dbg("Cleaning up\n"); 181 ibmasm_free_remote_input_dev(sp); 182 iounmap(sp->base_address); 183 ibmasm_event_buffer_exit(sp); 184 kfree(sp); 185 pci_release_regions(pdev); 186 pci_disable_device(pdev); 187 } 188 189 static struct pci_device_id ibmasm_pci_table[] = 190 { 191 { PCI_DEVICE(VENDORID_IBM, DEVICEID_RSA) }, 192 {}, 193 }; 194 195 static struct pci_driver ibmasm_driver = { 196 .name = DRIVER_NAME, 197 .id_table = ibmasm_pci_table, 198 .probe = ibmasm_init_one, 199 .remove = ibmasm_remove_one, 200 }; 201 ibmasm_exit(void)202 static void __exit ibmasm_exit (void) 203 { 204 ibmasm_unregister_panic_notifier(); 205 ibmasmfs_unregister(); 206 pci_unregister_driver(&ibmasm_driver); 207 info(DRIVER_DESC " version " DRIVER_VERSION " unloaded"); 208 } 209 ibmasm_init(void)210 static int __init ibmasm_init(void) 211 { 212 int result = pci_register_driver(&ibmasm_driver); 213 if (result) 214 return result; 215 216 result = ibmasmfs_register(); 217 if (result) { 218 pci_unregister_driver(&ibmasm_driver); 219 err("Failed to register ibmasmfs file system"); 220 return result; 221 } 222 223 ibmasm_register_panic_notifier(); 224 info(DRIVER_DESC " version " DRIVER_VERSION " loaded"); 225 return 0; 226 } 227 228 module_init(ibmasm_init); 229 module_exit(ibmasm_exit); 230 231 MODULE_AUTHOR(DRIVER_AUTHOR); 232 MODULE_DESCRIPTION(DRIVER_DESC); 233 MODULE_LICENSE("GPL"); 234 MODULE_DEVICE_TABLE(pci, ibmasm_pci_table); 235 236