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Linux/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 <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         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 
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 repsonse 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 
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 
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 

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