source: mainline/uspace/srv/kbd/port/ns16550.c@ 430afff

/*
 * Copyright (c) 2006 Josef Cejka
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup kbd_port
 * @ingroup  kbd
 * @{
 */ 
/** @file
 * @brief       NS16550 port driver.
 */

#include <ipc/ipc.h>
#include <async.h>
#include <sysinfo.h>
#include <kbd.h>
#include <kbd_port.h>
#include <ddi.h>

/* NS16550 registers */
#define RBR_REG         0       /** Receiver Buffer Register. */
#define IER_REG         1       /** Interrupt Enable Register. */
#define IIR_REG         2       /** Interrupt Ident Register (read). */
#define FCR_REG         2       /** FIFO control register (write). */
#define LCR_REG         3       /** Line Control register. */
#define MCR_REG         4       /** Modem Control Register. */
#define LSR_REG         5       /** Line Status Register. */

#define LSR_DATA_READY  0x01

static irq_cmd_t ns16550_cmds[] = {
        {
                .cmd = CMD_PIO_READ_8,
                .addr = (void *) 0,     /* will be patched in run-time */
                .dstarg = 1
        },
        {
                .cmd = CMD_BTEST,
                .value = LSR_DATA_READY,
                .srcarg = 1,
                .dstarg = 3
        },
        {
                .cmd = CMD_PREDICATE,
                .value = 2,
                .srcarg = 3
        },
        {
                .cmd = CMD_PIO_READ_8,
                .addr = (void *) 0,     /* will be patched in run-time */
                .dstarg = 2
        },
        {
                .cmd = CMD_ACCEPT
        }
};

irq_code_t ns16550_kbd = {
        sizeof(ns16550_cmds) / sizeof(irq_cmd_t),
        ns16550_cmds
};

static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call);

uint16_t ns16550_port;

int kbd_port_init(void)
{
        async_set_interrupt_received(ns16550_irq_handler);

        ns16550_port = sysinfo_value("kbd.port");
        ns16550_kbd.cmds[0].addr = (void *) (ns16550_port + LSR_REG);
        ns16550_kbd.cmds[3].addr = (void *) (ns16550_port + RBR_REG);
        ipc_register_irq(sysinfo_value("kbd.inr"), sysinfo_value("kbd.devno"),
            0, &ns16550_kbd);
        iospace_enable(task_get_id(), ns16550_port, 8);

        return 0;
}

static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call)
{
        int scan_code = IPC_GET_ARG2(*call);
        kbd_push_scancode(scan_code);
}

/**
 * @}
 */