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 */
24
25 #include <linux/kernel.h>
26 #include <linux/types.h>
27 #include <linux/errno.h>
28 #include <linux/list.h>
29 #include <linux/wait.h>
30 #include <linux/spinlock.h>
31 #include <linux/slab.h>
32 #include <linux/config.h>
33 #include <linux/module.h>
34 #include <linux/version.h>
35 #include <linux/interrupt.h>
36 #include <linux/device.h>
37
38 /* Driver identification */
39 #define DRIVER_NAME "ibmasm"
40 #define DRIVER_VERSION "0.4"
41 #define DRIVER_AUTHOR "Max Asbock"
42 #define DRIVER_DESC "IBM ASM Service Processor Driver"
43
44 #define err(msg) printk(KERN_ERR "%s: " msg "\n", DRIVER_NAME)
45 #define info(msg) printk(KERN_INFO "%s: " msg "\n", DRIVER_NAME)
46
47
48 #define IBMASM_CMD_PENDING 0
49 #define IBMASM_CMD_COMPLETE 1
50 #define IBMASM_CMD_FAILED 2
51
52 #define IBMASM_CMD_TIMEOUT_NORMAL 45
53 #define IBMASM_CMD_TIMEOUT_EXTRA 240
54
55 #define IBMASM_CMD_MAX_BUFFER_SIZE 0x4000
56
57 #define REVERSE_HEARTBEAT_TIMEOUT 120
58
59 #define HEARTBEAT_BUFFER_SIZE 0x400
60
61 #ifdef IA64
62 #define IBMASM_DRIVER_VPD "Lin64 6.08 "
63 #else
64 #define IBMASM_DRIVER_VPD "Lin32 6.08 "
65 #endif
66
67 #define SYSTEM_STATE_OS_UP 5
68 #define SYSTEM_STATE_OS_DOWN 4
69
70 #define IBMASM_NAME_SIZE 16
71
72 #define IBMASM_NUM_EVENTS 10
73 #define IBMASM_EVENT_MAX_SIZE 2048u
74
75
76 struct command {
77 struct list_head queue_node;
78 wait_queue_head_t wait;
79 unsigned char *buffer;
80 size_t buffer_size;
81 int status;
82 struct kobject kobj;
83 };
84 #define to_command(c) container_of(c, struct command, kobj)
85
86 static inline void command_put(struct command *cmd)
87 {
88 kobject_put(&cmd->kobj);
89 }
90
91 static inline void command_get(struct command *cmd)
92 {
93 kobject_get(&cmd->kobj);
94 }
95
96
97 struct ibmasm_event {
98 unsigned int serial_number;
99 unsigned int data_size;
100 unsigned char data[IBMASM_EVENT_MAX_SIZE];
101 };
102
103 struct event_buffer {
104 struct ibmasm_event events[IBMASM_NUM_EVENTS];
105 unsigned int next_serial_number;
106 unsigned int next_index;
107 struct list_head readers;
108 };
109
110 struct event_reader {
111 unsigned int next_serial_number;
112 wait_queue_head_t wait;
113 struct list_head node;
114 unsigned int data_size;
115 unsigned char data[IBMASM_EVENT_MAX_SIZE];
116 };
117
118 struct reverse_heartbeat {
119 wait_queue_head_t wait;
120 unsigned int stopped;
121 };
122
123
124 /* remote console events */
125 struct mouse_event {
126 long x;
127 long y;
128 unsigned char buttons;
129 unsigned char transitions;
130 };
131
132 struct keyboard_event {
133 unsigned long key_code;
134 unsigned char key_down;
135 };
136
137 struct remote_event {
138 unsigned long type;
139 union {
140 struct mouse_event mouse;
141 struct keyboard_event keyboard;
142 } data;
143 };
144
145 #define DRIVER_REMOTE_QUEUE_SIZE 240
146
147 struct remote_queue {
148 struct remote_event *start;
149 struct remote_event *end;
150 struct remote_event *reader;
151 struct remote_event *writer;
152 unsigned int size;
153 int open;
154 wait_queue_head_t wait;
155 };
156
157
158 struct service_processor {
159 struct list_head node;
160 spinlock_t lock;
161 void __iomem *base_address;
162 unsigned int irq;
163 struct command *current_command;
164 struct command *heartbeat;
165 struct list_head command_queue;
166 struct event_buffer *event_buffer;
167 char dirname[IBMASM_NAME_SIZE];
168 char devname[IBMASM_NAME_SIZE];
169 unsigned int number;
170 struct remote_queue remote_queue;
171 int serial_line;
172 struct device *dev;
173 };
174
175 /* command processing */
176 extern struct command *ibmasm_new_command(size_t buffer_size);
177 extern void ibmasm_exec_command(struct service_processor *sp, struct command *cmd);
178 extern void ibmasm_wait_for_response(struct command *cmd, int timeout);
179 extern void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size);
180
181 /* event processing */
182 extern int ibmasm_event_buffer_init(struct service_processor *sp);
183 extern void ibmasm_event_buffer_exit(struct service_processor *sp);
184 extern void ibmasm_receive_event(struct service_processor *sp, void *data, unsigned int data_size);
185 extern void ibmasm_event_reader_register(struct service_processor *sp, struct event_reader *reader);
186 extern void ibmasm_event_reader_unregister(struct service_processor *sp, struct event_reader *reader);
187 extern int ibmasm_get_next_event(struct service_processor *sp, struct event_reader *reader);
188
189 /* heartbeat - from SP to OS */
190 extern void ibmasm_register_panic_notifier(void);
191 extern void ibmasm_unregister_panic_notifier(void);
192 extern int ibmasm_heartbeat_init(struct service_processor *sp);
193 extern void ibmasm_heartbeat_exit(struct service_processor *sp);
194 extern void ibmasm_receive_heartbeat(struct service_processor *sp, void *message, size_t size);
195
196 /* reverse heartbeat - from OS to SP */
197 extern void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
198 extern int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
199 extern void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb);
200
201 /* dot commands */
202 extern void ibmasm_receive_message(struct service_processor *sp, void *data, int data_size);
203 extern int ibmasm_send_driver_vpd(struct service_processor *sp);
204 extern int ibmasm_send_os_state(struct service_processor *sp, int os_state);
205
206 /* low level message processing */
207 extern int ibmasm_send_i2o_message(struct service_processor *sp);
208 extern irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id, struct pt_regs *regs);
209
210 /* remote console */
211 extern void ibmasm_handle_mouse_interrupt(struct service_processor *sp);
212 extern int ibmasm_init_remote_queue(struct service_processor *sp);
213 extern void ibmasm_free_remote_queue(struct service_processor *sp);
214 extern void ibmasm_advance_reader(struct remote_queue *q, unsigned int n);
215 extern size_t ibmasm_events_available(struct remote_queue *q);
216
217 /* file system */
218 extern int ibmasmfs_register(void);
219 extern void ibmasmfs_unregister(void);
220 extern void ibmasmfs_add_sp(struct service_processor *sp);
221
222 /* uart */
223 #ifdef CONFIG_SERIAL_8250
224 extern void ibmasm_register_uart(struct service_processor *sp);
225 extern void ibmasm_unregister_uart(struct service_processor *sp);
226 #else
227 #define ibmasm_register_uart(sp) do { } while(0)
228 #define ibmasm_unregister_uart(sp) do { } while(0)
229 #endif
230
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