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         if (message_size == 0)
  37                 return;
  38
  39         size = get_dot_command_size(message);
  40         if (size == 0)
  41                 return;
  42
  43         if (size > message_size)
  44                 size = message_size;
  45
  46         switch (header->type) {
  47         case sp_event:
  48                 ibmasm_receive_event(sp, message, size);
  49                 break;
  50         case sp_command_response:
  51                 ibmasm_receive_command_response(sp, message, size);
  52                 break;
  53         case sp_heartbeat:
  54                 ibmasm_receive_heartbeat(sp, message, size);
  55                 break;
  56         default:
  57                 dev_err(sp->dev, "Received unknown message from service processor\n");
  58         }
  59 }
  60
  61
  62 #define INIT_BUFFER_SIZE 32
  63
  64
  65 /**
  66  * send the 4.3.5.10 dot command (driver VPD) to the service processor
  67  */
  68 int ibmasm_send_driver_vpd(struct service_processor *sp)
  69 {
  70         struct command *command;
  71         struct dot_command_header *header;
  72         u8 *vpd_command;
  73         u8 *vpd_data;
  74         int result = 0;
  75
  76         command = ibmasm_new_command(sp, INIT_BUFFER_SIZE);
  77         if (command == NULL)
  78                 return -ENOMEM;
  79
  80         header = (struct dot_command_header *)command->buffer;
  81         header->type                = sp_write;
  82         header->command_size        = 4;
  83         header->data_size           = 16;
  84         header->status              = 0;
  85         header->reserved            = 0;
  86
  87         vpd_command = command->buffer + sizeof(struct dot_command_header);
  88         vpd_command[0] = 0x4;
  89         vpd_command[1] = 0x3;
  90         vpd_command[2] = 0x5;
  91         vpd_command[3] = 0xa;
  92
  93         vpd_data = vpd_command + header->command_size;
  94         vpd_data[0] = 0;
  95         strcat(vpd_data, IBMASM_DRIVER_VPD);
  96         vpd_data[10] = 0;
  97         vpd_data[15] = 0;
  98
  99         ibmasm_exec_command(sp, command);
 100         ibmasm_wait_for_response(command, IBMASM_CMD_TIMEOUT_NORMAL);
 101
 102         if (command->status != IBMASM_CMD_COMPLETE)
 103                 result = -ENODEV;
 104
 105         command_put(command);
 106
 107         return result;
 108 }
 109
 110 struct os_state_command {
 111         struct dot_command_header       header;
 112         unsigned char                   command[3];
 113         unsigned char                   data;
 114 };
 115
 116 /**
 117  * send the 4.3.6 dot command (os state) to the service processor
 118  * During driver init this function is called with os state "up".
 119  * This causes the service processor to start sending heartbeats the
 120  * driver.
 121  * During driver exit the function is called with os state "down",
 122  * causing the service processor to stop the heartbeats.
 123  */
 124 int ibmasm_send_os_state(struct service_processor *sp, int os_state)
 125 {
 126         struct command *cmd;
 127         struct os_state_command *os_state_cmd;
 128         int result = 0;
 129
 130         cmd = ibmasm_new_command(sp, sizeof(struct os_state_command));
 131         if (cmd == NULL)
 132                 return -ENOMEM;
 133
 134         os_state_cmd = (struct os_state_command *)cmd->buffer;
 135         os_state_cmd->header.type               = sp_write;
 136         os_state_cmd->header.command_size       = 3;
 137         os_state_cmd->header.data_size          = 1;
 138         os_state_cmd->header.status             = 0;
 139         os_state_cmd->command[0]                = 4;
 140         os_state_cmd->command[1]                = 3;
 141         os_state_cmd->command[2]                = 6;
 142         os_state_cmd->data                      = os_state;
 143
 144         ibmasm_exec_command(sp, cmd);
 145         ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);
 146
 147         if (cmd->status != IBMASM_CMD_COMPLETE)
 148                 result = -ENODEV;
 149
 150         command_put(cmd);
 151         return result;
 152 }