// 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 <linux/termios.h>
#include <linux/tty.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/serial_8250.h>
#include "ibmasm.h"
#include "lowlevel.h"


void ibmasm_register_uart(struct service_processor *sp)
{
        struct uart_8250_port uart;
        void __iomem *iomem_base;

        iomem_base = sp->base_address + SCOUT_COM_B_BASE;

        /* read the uart scratch register to determine if the UART
         * is dedicated to the service processor or if the OS can use it
         */
        if (0 == readl(iomem_base + UART_SCR)) {
                dev_info(sp->dev, "IBM SP UART not registered, owned by service processor\n");
                sp->serial_line = -1;
                return;
        }

        memset(&uart, 0, sizeof(uart));
        uart.port.irq           = sp->irq;
        uart.port.uartclk       = 3686400;
        uart.port.flags         = UPF_SHARE_IRQ;
        uart.port.iotype        = UPIO_MEM;
        uart.port.membase       = iomem_base;

        sp->serial_line = serial8250_register_8250_port(&uart);
        if (sp->serial_line < 0) {
                dev_err(sp->dev, "Failed to register serial port\n");
                return;
        }
        enable_uart_interrupts(sp->base_address);
}

void ibmasm_unregister_uart(struct service_processor *sp)
{
        if (sp->serial_line < 0)
                return;

        disable_uart_interrupts(sp->base_address);
        serial8250_unregister_port(sp->serial_line);
}