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 Asb�ck <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/module.h>
33 #include <linux/interrupt.h>
34 #include <linux/kref.h>
35 #include <linux/device.h>
36 #include <linux/input.h>
37
38 /* Driver identification */
39 #define DRIVER_NAME "ibmasm"
40 #define DRIVER_VERSION "1.0"
41 #define DRIVER_AUTHOR "Max Asbock <masbock@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
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 extern int ibmasm_debug;
48 #define dbg(STR, ARGS...) \
49 do { \
50 if (ibmasm_debug) \
51 printk(KERN_DEBUG STR , ##ARGS); \
52 } while (0)
53
get_timestamp(char * buf)54 static inline char *get_timestamp(char *buf)
55 {
56 struct timeval now;
57 do_gettimeofday(&now);
58 sprintf(buf, "%lu.%lu", now.tv_sec, now.tv_usec);
59 return buf;
60 }
61
62 #define IBMASM_CMD_PENDING 0
63 #define IBMASM_CMD_COMPLETE 1
64 #define IBMASM_CMD_FAILED 2
65
66 #define IBMASM_CMD_TIMEOUT_NORMAL 45
67 #define IBMASM_CMD_TIMEOUT_EXTRA 240
68
69 #define IBMASM_CMD_MAX_BUFFER_SIZE 0x8000
70
71 #define REVERSE_HEARTBEAT_TIMEOUT 120
72
73 #define HEARTBEAT_BUFFER_SIZE 0x400
74
75 #ifdef IA64
76 #define IBMASM_DRIVER_VPD "Lin64 6.08 "
77 #else
78 #define IBMASM_DRIVER_VPD "Lin32 6.08 "
79 #endif
80
81 #define SYSTEM_STATE_OS_UP 5
82 #define SYSTEM_STATE_OS_DOWN 4
83
84 #define IBMASM_NAME_SIZE 16
85
86 #define IBMASM_NUM_EVENTS 10
87 #define IBMASM_EVENT_MAX_SIZE 2048u
88
89
90 struct command {
91 struct list_head queue_node;
92 wait_queue_head_t wait;
93 unsigned char *buffer;
94 size_t buffer_size;
95 int status;
96 struct kref kref;
97 spinlock_t *lock;
98 };
99 #define to_command(c) container_of(c, struct command, kref)
100
101 void ibmasm_free_command(struct kref *kref);
command_put(struct command * cmd)102 static inline void command_put(struct command *cmd)
103 {
104 unsigned long flags;
105 spinlock_t *lock = cmd->lock;
106
107 spin_lock_irqsave(lock, flags);
108 kref_put(&cmd->kref, ibmasm_free_command);
109 spin_unlock_irqrestore(lock, flags);
110 }
111
command_get(struct command * cmd)112 static inline void command_get(struct command *cmd)
113 {
114 kref_get(&cmd->kref);
115 }
116
117
118 struct ibmasm_event {
119 unsigned int serial_number;
120 unsigned int data_size;
121 unsigned char data[IBMASM_EVENT_MAX_SIZE];
122 };
123
124 struct event_buffer {
125 struct ibmasm_event events[IBMASM_NUM_EVENTS];
126 unsigned int next_serial_number;
127 unsigned int next_index;
128 struct list_head readers;
129 };
130
131 struct event_reader {
132 int cancelled;
133 unsigned int next_serial_number;
134 wait_queue_head_t wait;
135 struct list_head node;
136 unsigned int data_size;
137 unsigned char data[IBMASM_EVENT_MAX_SIZE];
138 };
139
140 struct reverse_heartbeat {
141 wait_queue_head_t wait;
142 unsigned int stopped;
143 };
144
145 struct ibmasm_remote {
146 struct input_dev *keybd_dev;
147 struct input_dev *mouse_dev;
148 };
149
150 struct service_processor {
151 struct list_head node;
152 spinlock_t lock;
153 void __iomem *base_address;
154 unsigned int irq;
155 struct command *current_command;
156 struct command *heartbeat;
157 struct list_head command_queue;
158 struct event_buffer *event_buffer;
159 char dirname[IBMASM_NAME_SIZE];
160 char devname[IBMASM_NAME_SIZE];
161 unsigned int number;
162 struct ibmasm_remote remote;
163 int serial_line;
164 struct device *dev;
165 };
166
167 /* command processing */
168 struct command *ibmasm_new_command(struct service_processor *sp, size_t buffer_size);
169 void ibmasm_exec_command(struct service_processor *sp, struct command *cmd);
170 void ibmasm_wait_for_response(struct command *cmd, int timeout);
171 void ibmasm_receive_command_response(struct service_processor *sp, void *response, size_t size);
172
173 /* event processing */
174 int ibmasm_event_buffer_init(struct service_processor *sp);
175 void ibmasm_event_buffer_exit(struct service_processor *sp);
176 void ibmasm_receive_event(struct service_processor *sp, void *data, unsigned int data_size);
177 void ibmasm_event_reader_register(struct service_processor *sp, struct event_reader *reader);
178 void ibmasm_event_reader_unregister(struct service_processor *sp, struct event_reader *reader);
179 int ibmasm_get_next_event(struct service_processor *sp, struct event_reader *reader);
180 void ibmasm_cancel_next_event(struct event_reader *reader);
181
182 /* heartbeat - from SP to OS */
183 void ibmasm_register_panic_notifier(void);
184 void ibmasm_unregister_panic_notifier(void);
185 int ibmasm_heartbeat_init(struct service_processor *sp);
186 void ibmasm_heartbeat_exit(struct service_processor *sp);
187 void ibmasm_receive_heartbeat(struct service_processor *sp, void *message, size_t size);
188
189 /* reverse heartbeat - from OS to SP */
190 void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
191 int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb);
192 void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb);
193
194 /* dot commands */
195 void ibmasm_receive_message(struct service_processor *sp, void *data, int data_size);
196 int ibmasm_send_driver_vpd(struct service_processor *sp);
197 int ibmasm_send_os_state(struct service_processor *sp, int os_state);
198
199 /* low level message processing */
200 int ibmasm_send_i2o_message(struct service_processor *sp);
201 irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id);
202
203 /* remote console */
204 void ibmasm_handle_mouse_interrupt(struct service_processor *sp);
205 int ibmasm_init_remote_input_dev(struct service_processor *sp);
206 void ibmasm_free_remote_input_dev(struct service_processor *sp);
207
208 /* file system */
209 int ibmasmfs_register(void);
210 void ibmasmfs_unregister(void);
211 void ibmasmfs_add_sp(struct service_processor *sp);
212
213 /* uart */
214 #ifdef CONFIG_SERIAL_8250
215 void ibmasm_register_uart(struct service_processor *sp);
216 void ibmasm_unregister_uart(struct service_processor *sp);
217 #else
218 #define ibmasm_register_uart(sp) do { } while(0)
219 #define ibmasm_unregister_uart(sp) do { } while(0)
220 #endif
221