drivers/misc/ibmasm/dot_command.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * IBM ASM Service Processor Device Driver
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  *
   7  * Author: Max Asböck <amax@us.ibm.com>
   8  */
   9
  10 #include "ibmasm.h"
  11 #include "dot_command.h"
  12
  13 /**
  14  * Dispatch an incoming message to the specific handler for the message.
  15  * Called from interrupt context.
  16  */
  17 void ibmasm_receive_message(struct service_processor *sp, void *message, int message_size)
  18 {
  19         u32 size;
  20         struct dot_command_header *header = (struct dot_command_header *)message;
  21
  22         if (message_size == 0)
  23                 return;
  24
  25         size = get_dot_command_size(message);
  26         if (size == 0)
  27                 return;
  28
  29         if (size > message_size)
  30                 size = message_size;
  31
  32         switch (header->type) {
  33         case sp_event:
  34                 ibmasm_receive_event(sp, message, size);
  35                 break;
  36         case sp_command_response:
  37                 ibmasm_receive_command_response(sp, message, size);
  38                 break;
  39         case sp_heartbeat:
  40                 ibmasm_receive_heartbeat(sp, message, size);
  41                 break;
  42         default:
  43                 dev_err(sp->dev, "Received unknown message from service processor\n");
  44         }
  45 }
  46
  47
  48 #define INIT_BUFFER_SIZE 32
  49
  50
  51 /**
  52  * send the 4.3.5.10 dot command (driver VPD) to the service processor
  53  */
  54 int ibmasm_send_driver_vpd(struct service_processor *sp)
  55 {
  56         struct command *command;
  57         struct dot_command_header *header;
  58         u8 *vpd_command;
  59         u8 *vpd_data;
  60         int result = 0;
  61
  62         command = ibmasm_new_command(sp, INIT_BUFFER_SIZE);
  63         if (command == NULL)
  64                 return -ENOMEM;
  65
  66         header = (struct dot_command_header *)command->buffer;
  67         header->type                = sp_write;
  68         header->command_size        = 4;
  69         header->data_size           = 16;
  70         header->status              = 0;
  71         header->reserved            = 0;
  72
  73         vpd_command = command->buffer + sizeof(struct dot_command_header);
  74         vpd_command[0] = 0x4;
  75         vpd_command[1] = 0x3;
  76         vpd_command[2] = 0x5;
  77         vpd_command[3] = 0xa;
  78
  79         vpd_data = vpd_command + header->command_size;
  80         vpd_data[0] = 0;
  81         strcat(vpd_data, IBMASM_DRIVER_VPD);
  82         vpd_data[10] = 0;
  83         vpd_data[15] = 0;
  84
  85         ibmasm_exec_command(sp, command);
  86         ibmasm_wait_for_response(command, IBMASM_CMD_TIMEOUT_NORMAL);
  87
  88         if (command->status != IBMASM_CMD_COMPLETE)
  89                 result = -ENODEV;
  90
  91         command_put(command);
  92
  93         return result;
  94 }
  95
  96 struct os_state_command {
  97         struct dot_command_header       header;
  98         unsigned char                   command[3];
  99         unsigned char                   data;
 100 };
 101
 102 /**
 103  * send the 4.3.6 dot command (os state) to the service processor
 104  * During driver init this function is called with os state "up".
 105  * This causes the service processor to start sending heartbeats the
 106  * driver.
 107  * During driver exit the function is called with os state "down",
 108  * causing the service processor to stop the heartbeats.
 109  */
 110 int ibmasm_send_os_state(struct service_processor *sp, int os_state)
 111 {
 112         struct command *cmd;
 113         struct os_state_command *os_state_cmd;
 114         int result = 0;
 115
 116         cmd = ibmasm_new_command(sp, sizeof(struct os_state_command));
 117         if (cmd == NULL)
 118                 return -ENOMEM;
 119
 120         os_state_cmd = (struct os_state_command *)cmd->buffer;
 121         os_state_cmd->header.type               = sp_write;
 122         os_state_cmd->header.command_size       = 3;
 123         os_state_cmd->header.data_size          = 1;
 124         os_state_cmd->header.status             = 0;
 125         os_state_cmd->command[0]                = 4;
 126         os_state_cmd->command[1]                = 3;
 127         os_state_cmd->command[2]                = 6;
 128         os_state_cmd->data                      = os_state;
 129
 130         ibmasm_exec_command(sp, cmd);
 131         ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);
 132
 133         if (cmd->status != IBMASM_CMD_COMPLETE)
 134                 result = -ENODEV;
 135
 136         command_put(cmd);
 137         return result;
 138 }