uart.c

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/*
 * IBM ASM Service Processor Device Driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) IBM Corporation, 2004
 *
 * Author: Max Asböck <[email protected]>
 *
 */

#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);
}