LXR linux/drivers/misc/ibmasm/dot

   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 */
  31void 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 */
  68int 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
 110struct 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 */
 124int 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}
 153