drivers/misc/ibmasm/dot_command.c

   1 /*
   2  * IBM ASM Service Processor Device Driver
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * Copyright (C) IBM Corporation, 2004
  19  *
  20  * Author: Max Asböck <amax@us.ibm.com>
  21  *
  22  */
  23
  24 #include "ibmasm.h"
  25 #include "dot_command.h"
  26
  27 /**
  28  * Dispatch an incoming message to the specific handler for the message.
  29  * Called from interrupt context.
  30  */
  31 void ibmasm_receive_message(struct service_processor *sp, void *message, int message_size)
  32 {
  33         u32 size;
  34         struct dot_command_header *header = (struct dot_command_header *)message;
  35
  36         size = get_dot_command_size(message);
  37         if (size > message_size)
  38                 size = message_size;
  39
  40         switch (header->type) {
  41         case sp_event:
  42                 ibmasm_receive_event(sp, message, size);
  43                 break;
  44         case sp_command_response:
  45                 ibmasm_receive_command_response(sp, message, size);
  46                 break;
  47         case sp_heartbeat:
  48                 ibmasm_receive_heartbeat(sp, message, size);
  49                 break;
  50         default:
  51                 dev_err(sp->dev, "Received unknown message from service processor\n");
  52         }
  53 }
  54
  55
  56 #define INIT_BUFFER_SIZE 32
  57
  58
  59 /**
  60  * send the 4.3.5.10 dot command (driver VPD) to the service processor
  61  */
  62 int ibmasm_send_driver_vpd(struct service_processor *sp)
  63 {
  64         struct command *command;
  65         struct dot_command_header *header;
  66         u8 *vpd_command;
  67         u8 *vpd_data;
  68         int result = 0;
  69
  70         command = ibmasm_new_command(INIT_BUFFER_SIZE);
  71         if (command == NULL)
  72                 return -ENOMEM;
  73
  74         header = (struct dot_command_header *)command->buffer;
  75         header->type                = sp_write;
  76         header->command_size        = 4;
  77         header->data_size           = 16;
  78         header->status              = 0;
  79         header->reserved            = 0;
  80
  81         vpd_command = command->buffer + sizeof(struct dot_command_header);
  82         vpd_command[0] = 0x4;
  83         vpd_command[1] = 0x3;
  84         vpd_command[2] = 0x5;
  85         vpd_command[3] = 0xa;
  86
  87         vpd_data = vpd_command + header->command_size;
  88         vpd_data[0] = 0;
  89         strcat(vpd_data, IBMASM_DRIVER_VPD);
  90         vpd_data[10] = 0;
  91         vpd_data[15] = 0;
  92
  93         ibmasm_exec_command(sp, command);
  94         ibmasm_wait_for_response(command, IBMASM_CMD_TIMEOUT_NORMAL);
  95
  96         if (command->status != IBMASM_CMD_COMPLETE)
  97                 result = -ENODEV;
  98
  99         command_put(command);
 100
 101         return result;
 102 }
 103
 104 struct os_state_command {
 105         struct dot_command_header       header;
 106         unsigned char                   command[3];
 107         unsigned char                   data;
 108 };
 109
 110 /**
 111  * send the 4.3.6 dot command (os state) to the service processor
 112  * During driver init this function is called with os state "up".
 113  * This causes the service processor to start sending heartbeats the
 114  * driver.
 115  * During driver exit the function is called with os state "down",
 116  * causing the service processor to stop the heartbeats.
 117  */
 118 int ibmasm_send_os_state(struct service_processor *sp, int os_state)
 119 {
 120         struct command *cmd;
 121         struct os_state_command *os_state_cmd;
 122         int result = 0;
 123
 124         cmd = ibmasm_new_command(sizeof(struct os_state_command));
 125         if (cmd == NULL)
 126                 return -ENOMEM;
 127
 128         os_state_cmd = (struct os_state_command *)cmd->buffer;
 129         os_state_cmd->header.type               = sp_write;
 130         os_state_cmd->header.command_size       = 3;
 131         os_state_cmd->header.data_size          = 1;
 132         os_state_cmd->header.status             = 0;
 133         os_state_cmd->command[0]                = 4;
 134         os_state_cmd->command[1]                = 3;
 135         os_state_cmd->command[2]                = 6;
 136         os_state_cmd->data                      = os_state;
 137
 138         ibmasm_exec_command(sp, cmd);
 139         ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);
 140
 141         if (cmd->status != IBMASM_CMD_COMPLETE)
 142                 result = -ENODEV;
 143
 144         command_put(cmd);
 145         return result;
 146 }