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/*

 * Copyright (c) 2001-2006 Jakub Jermar

 * 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 genarch

 * @{

 */

/**

 * @file

 * @brief   NS 16550 serial port / keyboard driver.

 */

#include <genarch/kbd/ns16550.h>

#include <genarch/kbd/key.h>

#include <genarch/kbd/scanc.h>

#include <genarch/kbd/scanc_sun.h>

#include <arch/drivers/kbd.h>

#include <ddi/irq.h>

#include <cpu.h>

#include <arch/asm.h>

#include <arch.h>

#include <console/chardev.h>

#include <console/console.h>

#include <interrupt.h>

#include <arch/interrupt.h>

#include <sysinfo/sysinfo.h>

#include <synch/spinlock.h>

#include <mm/slab.h>

#define LSR_DATA_READY  0x01

/*

 * These codes read from ns16550 data register are silently ignored.

 */

#define IGNORE_CODE 0x7f        /* all keys up */

static void ns16550_suspend(chardev_t *);

static void ns16550_resume(chardev_t *);

static chardev_operations_t ops = {

    .suspend = ns16550_suspend,

    .resume = ns16550_resume,

};

/** Initialize ns16550.

 *

 * @param dev       Addrress of the beginning of the device in I/O space.

 * @param devno     Device number.

 * @param inr       Interrupt number.

 * @param cir       Clear interrupt function.

 * @param cir_arg   First argument to cir.

 *

 * @return      True on success, false on failure.

 */

bool

ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg)

{

    ns16550_instance_t *instance;

    chardev_initialize("ns16550_kbd", &kbrd, &ops);

    stdin = &kbrd;

    instance = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);

    if (!instance)

        return false;

    instance->devno = devno;

    instance->ns16550 = dev;

    irq_initialize(&instance->irq);

    instance->irq.devno = devno;

    instance->irq.inr = inr;

    instance->irq.claim = ns16550_claim;

    instance->irq.handler = ns16550_irq_handler;

    instance->irq.instance = instance;

    instance->irq.cir = cir;

    instance->irq.cir_arg = cir_arg;

    irq_register(&instance->irq);

    while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))

        (void) pio_read_8(&dev->rbr);

    /*

     * This is the necessary evil until the userspace driver is entirely

     * self-sufficient.

     */

    sysinfo_set_item_val("kbd", NULL, true);

    sysinfo_set_item_val("kbd.type", NULL, KBD_NS16550);

    sysinfo_set_item_val("kbd.devno", NULL, devno);

    sysinfo_set_item_val("kbd.inr", NULL, inr);

    sysinfo_set_item_val("kbd.address.virtual", NULL, (uintptr_t) dev);

    sysinfo_set_item_val("kbd.port", NULL, (uintptr_t) dev);

    /* Enable interrupts */

    pio_write_8(&dev->ier, IER_ERBFI);

    pio_write_8(&dev->mcr, MCR_OUT2);

    return true;

}

/* Called from getc(). */

void ns16550_resume(chardev_t *d)

{

}

/* Called from getc(). */

void ns16550_suspend(chardev_t *d)

{

}

irq_ownership_t ns16550_claim(irq_t *irq)

{

    ns16550_instance_t *ns16550_instance = irq->instance;

    ns16550_t *dev = ns16550_instance->ns16550;

    if (pio_read_8(&dev->lsr) & LSR_DATA_READY)

        return IRQ_ACCEPT;

    else

        return IRQ_DECLINE;

}

void ns16550_irq_handler(irq_t *irq)

{

    ns16550_instance_t *ns16550_instance = irq->instance;

    ns16550_t *dev = ns16550_instance->ns16550;

    if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {

        uint8_t x;

        x = pio_read_8(&dev->rbr);

        if (x != IGNORE_CODE) {

            if (x & KEY_RELEASE)

                key_released(x ^ KEY_RELEASE);

            else

                key_pressed(x);

        }

    }

}

/** @}

 */