linux/linux-5.4.31/drivers/misc/ibmasm/dot_command.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * IBM ASM Service Processor Device Driver
 *
 * Copyright (C) IBM Corporation, 2004
 *
 * Author: Max Asböck <amax@us.ibm.com>
 */

#include "ibmasm.h"
#include "dot_command.h"

/**
 * Dispatch an incoming message to the specific handler for the message.
 * Called from interrupt context.
 */
void ibmasm_receive_message(struct service_processor *sp, void *message, int message_size)
{
	u32 size;
	struct dot_command_header *header = (struct dot_command_header *)message;

	if (message_size == 0)
		return;

	size = get_dot_command_size(message);
	if (size == 0)
		return;

	if (size > message_size)
		size = message_size;

	switch (header->type) {
	case sp_event:
		ibmasm_receive_event(sp, message, size);
		break;
	case sp_command_response:
		ibmasm_receive_command_response(sp, message, size);
		break;
	case sp_heartbeat:
		ibmasm_receive_heartbeat(sp, message, size);
		break;
	default:
		dev_err(sp->dev, "Received unknown message from service processor\n");
	}
}


#define INIT_BUFFER_SIZE 32


/**
 * send the 4.3.5.10 dot command (driver VPD) to the service processor
 */
int ibmasm_send_driver_vpd(struct service_processor *sp)
{
	struct command *command;
	struct dot_command_header *header;
	u8 *vpd_command;
	u8 *vpd_data;
	int result = 0;

	command = ibmasm_new_command(sp, INIT_BUFFER_SIZE);
	if (command == NULL)
		return -ENOMEM;

	header = (struct dot_command_header *)command->buffer;
	header->type                = sp_write;
	header->command_size        = 4;
	header->data_size           = 16;
	header->status              = 0;
	header->reserved            = 0;

	vpd_command = command->buffer + sizeof(struct dot_command_header);
	vpd_command[0] = 0x4;
	vpd_command[1] = 0x3;
	vpd_command[2] = 0x5;
	vpd_command[3] = 0xa;

	vpd_data = vpd_command + header->command_size;
	vpd_data[0] = 0;
	strcat(vpd_data, IBMASM_DRIVER_VPD);
	vpd_data[10] = 0;
	vpd_data[15] = 0;

	ibmasm_exec_command(sp, command);
	ibmasm_wait_for_response(command, IBMASM_CMD_TIMEOUT_NORMAL);

	if (command->status != IBMASM_CMD_COMPLETE)
		result = -ENODEV;

	command_put(command);

	return result;
}

struct os_state_command {
	struct dot_command_header	header;
	unsigned char			command[3];
	unsigned char			data;
};

/**
 * send the 4.3.6 dot command (os state) to the service processor
 * During driver init this function is called with os state "up".
 * This causes the service processor to start sending heartbeats the
 * driver.
 * During driver exit the function is called with os state "down",
 * causing the service processor to stop the heartbeats.
 */
int ibmasm_send_os_state(struct service_processor *sp, int os_state)
{
	struct command *cmd;
	struct os_state_command *os_state_cmd;
	int result = 0;

	cmd = ibmasm_new_command(sp, sizeof(struct os_state_command));
	if (cmd == NULL)
		return -ENOMEM;

	os_state_cmd = (struct os_state_command *)cmd->buffer;
	os_state_cmd->header.type		= sp_write;
	os_state_cmd->header.command_size	= 3;
	os_state_cmd->header.data_size		= 1;
	os_state_cmd->header.status		= 0;
	os_state_cmd->command[0]		= 4;
	os_state_cmd->command[1]		= 3;
	os_state_cmd->command[2]		= 6;
	os_state_cmd->data			= os_state;

	ibmasm_exec_command(sp, cmd);
	ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);

	if (cmd->status != IBMASM_CMD_COMPLETE)
		result = -ENODEV;

	command_put(cmd);
	return result;
}