// 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;
}