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/*

 * Copyright (c) 2005 Ondrej Palkovsky

 * 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 mips32 

 * @{

 */

/** @file

 */

#include <interrupt.h>

#include <ipc/irq.h>

#include <console/chardev.h>

#include <arch/drivers/msim.h>

#include <arch/cp0.h>

#include <console/console.h>

#include <sysinfo/sysinfo.h>

#include <synch/rcu.h>

/** Address of devices. */

#define MSIM_VIDEORAM       0xB0000000

#define MSIM_KBD_ADDRESS    0xB0000000

#define MSIM_KBD_IRQ        2

static chardev_t console;

static irq_t msim_irq;

static void msim_write(chardev_t *dev, const char ch);

static void msim_enable(chardev_t *dev);

static void msim_disable(chardev_t *dev);

static char msim_do_read(chardev_t *dev);

static chardev_operations_t msim_ops = {

    .resume = msim_enable,

    .suspend = msim_disable,

    .write = msim_write,

    .read = msim_do_read,

};

/** Putchar that works with MSIM & gxemul */

void msim_write(chardev_t *dev, const char ch)

{

    *((char *) MSIM_VIDEORAM) = ch;

}

/* Called from getc(). */

void msim_enable(chardev_t *dev)

{

    cp0_unmask_int(MSIM_KBD_IRQ);

}

/* Called from getc(). */

void msim_disable(chardev_t *dev)

{

    cp0_mask_int(MSIM_KBD_IRQ);

}

#include <print.h>

/** Read character using polling, assume interrupts disabled */

static char msim_do_read(chardev_t *dev)

{

    char ch;

    while (1) {

        ch = *((volatile char *) MSIM_KBD_ADDRESS);

        if (ch) {

            if (ch == '\r')

                return '\n';

            if (ch == 0x7f)

                return '\b';

            return ch;

        }

    }

}

/** Process keyboard interrupt. */

static void msim_irq_handler(irq_t *irq, void *arg, ...)

{

    if ((rcu_dereference_pointer(irq->notif_cfg).notify) && (rcu_dereference_pointer(irq->notif_cfg).answerbox))

        ipc_irq_send_notif(irq);

    else {

        char ch = 0;

            ch = *((char *) MSIM_KBD_ADDRESS);

            if (ch =='\r')

                ch = '\n';

            if (ch == 0x7f)

                ch = '\b';

            chardev_push_character(&console, ch);

    }

}

static irq_ownership_t msim_claim(void)

{

    return IRQ_ACCEPT;

}

void msim_kbd_grab(void)

{

    ipl_t ipl = interrupts_disable();

    //rcu_read_lock() is not needed, ints are disabled

    //rcu: atomic update doesn't need reallocation  

    rcu_dereference_pointer(msim_irq.notif_cfg).notify = false;

    interrupts_restore(ipl);

}

void msim_kbd_release(void)

{

    ipl_t ipl = interrupts_disable();

    //rcu: atomic update doesn't need reallocation

    spinlock_lock(&msim_irq.lock);

    if (rcu_dereference_pointer(msim_irq.notif_cfg).answerbox)

        rcu_dereference_pointer(msim_irq.notif_cfg).notify = true;

    spinlock_unlock(&msim_irq.lock);

    interrupts_restore(ipl);

}

/* Return console object representing msim console */

void msim_console(devno_t devno)

{

    chardev_initialize("msim_console", &console, &msim_ops);

    stdin = &console;

    stdout = &console;

    irq_initialize(&msim_irq);

    msim_irq.devno = devno;

    msim_irq.inr = MSIM_KBD_IRQ;

    msim_irq.claim = msim_claim;

    msim_irq.handler = msim_irq_handler;

    irq_register(&msim_irq);

    cp0_unmask_int(MSIM_KBD_IRQ);

    sysinfo_set_item_val("kbd", NULL, true);

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

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

    sysinfo_set_item_val("kbd.address.virtual", NULL, MSIM_KBD_ADDRESS);

}

/** @}

 */