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 = kzalloc(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
87 spin_lock_init(&sp->lock);
88 INIT_LIST_HEAD(&sp->command_queue);
89
90 pci_set_drvdata(pdev, (void *)sp);
91 sp->dev = &pdev->dev;
92 sp->number = pdev->bus->number;
93 snprintf(sp->dirname, IBMASM_NAME_SIZE, "%d", sp->number);
94 snprintf(sp->devname, IBMASM_NAME_SIZE, "%s%d", DRIVER_NAME, sp->number);
95
96 if (ibmasm_event_buffer_init(sp)) {
97 dev_err(sp->dev, "Failed to allocate event buffer\n");
98 goto error_eventbuffer;
99 }
100
101 if (ibmasm_heartbeat_init(sp)) {
102 dev_err(sp->dev, "Failed to allocate heartbeat command\n");
103 goto error_heartbeat;
104 }
105
106 sp->irq = pdev->irq;
107 sp->base_address = pci_ioremap_bar(pdev, 0);
108 if (!sp->base_address) {
109 dev_err(sp->dev, "Failed to ioremap pci memory\n");
110 result = -ENODEV;
111 goto error_ioremap;
112 }
113
114 result = request_irq(sp->irq, ibmasm_interrupt_handler, IRQF_SHARED, sp->devname, (void*)sp);
115 if (result) {
116 dev_err(sp->dev, "Failed to register interrupt handler\n");
117 goto error_request_irq;
118 }
119
120 enable_sp_interrupts(sp->base_address);
121
122 result = ibmasm_init_remote_input_dev(sp);
123 if (result) {
124 dev_err(sp->dev, "Failed to initialize remote queue\n");
125 goto error_send_message;
126 }
127
128 result = ibmasm_send_driver_vpd(sp);
129 if (result) {
130 dev_err(sp->dev, "Failed to send driver VPD to service processor\n");
131 goto error_send_message;
132 }
133 result = ibmasm_send_os_state(sp, SYSTEM_STATE_OS_UP);
134 if (result) {
135 dev_err(sp->dev, "Failed to send OS state to service processor\n");
136 goto error_send_message;
137 }
138 ibmasmfs_add_sp(sp);
139
140 ibmasm_register_uart(sp);
141
142 return 0;
143
144 error_send_message:
145 disable_sp_interrupts(sp->base_address);
146 ibmasm_free_remote_input_dev(sp);
147 free_irq(sp->irq, (void *)sp);
148 error_request_irq:
149 iounmap(sp->base_address);
150 error_ioremap:
151 ibmasm_heartbeat_exit(sp);
152 error_heartbeat:
153 ibmasm_event_buffer_exit(sp);
154 error_eventbuffer:
155 pci_set_drvdata(pdev, NULL);
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 __devexit ibmasm_remove_one(struct pci_dev *pdev)
166 {
167 struct service_processor *sp = (struct service_processor *)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 pci_set_drvdata(pdev, NULL);
185 kfree(sp);
186 pci_release_regions(pdev);
187 pci_disable_device(pdev);
188 }
189
190 static struct pci_device_id ibmasm_pci_table[] =
191 {
192 { PCI_DEVICE(VENDORID_IBM, DEVICEID_RSA) },
193 {},
194 };
195
196 static struct pci_driver ibmasm_driver = {
197 .name = DRIVER_NAME,
198 .id_table = ibmasm_pci_table,
199 .probe = ibmasm_init_one,
200 .remove = __devexit_p(ibmasm_remove_one),
201 };
202
203 static void __exit ibmasm_exit (void)
204 {
205 ibmasm_unregister_panic_notifier();
206 ibmasmfs_unregister();
207 pci_unregister_driver(&ibmasm_driver);
208 info(DRIVER_DESC " version " DRIVER_VERSION " unloaded");
209 }
210
211 static int __init ibmasm_init(void)
212 {
213 int result;
214
215 result = ibmasmfs_register();
216 if (result) {
217 err("Failed to register ibmasmfs file system");
218 return result;
219 }
220 result = pci_register_driver(&ibmasm_driver);
221 if (result) {
222 ibmasmfs_unregister();
223 return result;
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
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