139 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * IBM ASM Service Processor Device Driver4 *5 * Copyright (C) IBM Corporation, 20046 *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 */17void 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 3249 50 51/*52 * send the 4.3.5.10 dot command (driver VPD) to the service processor53 */54int 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 96struct 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 processor104 * During driver init this function is called with os state "up".105 * This causes the service processor to start sending heartbeats the106 * driver.107 * During driver exit the function is called with os state "down",108 * causing the service processor to stop the heartbeats.109 */110int 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}139