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/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 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); 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 } 111 112 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