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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 <ipc/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>

#define LSR_DATA_READY  0x01

/** Structure representing the ns16550. */

static ns16550_t ns16550;

/** Structure for ns16550's IRQ. */

static irq_t ns16550_irq;

/*

 * 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,

    .read = ns16550_key_read

};

void ns16550_interrupt(void);

/** Initialize keyboard and service interrupts using kernel routine */

void ns16550_grab(void)

{

    ipl_t ipl = interrupts_disable();

    ns16550_ier_write(&ns16550, IER_ERBFI);     /* enable receiver interrupt */

    while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY)

        (void) ns16550_rbr_read(&ns16550);

    spinlock_lock(&ns16550_irq.lock);

    ns16550_irq.notif_cfg.notify = false;

    spinlock_unlock(&ns16550_irq.lock);

    interrupts_restore(ipl);

}

/** Resume the former interrupt vector */

void ns16550_release(void)

{

    ipl_t ipl = interrupts_disable();

    spinlock_lock(&ns16550_irq.lock);

    if (ns16550_irq.notif_cfg.answerbox)

        ns16550_irq.notif_cfg.notify = true;

    spinlock_unlock(&ns16550_irq.lock);

    interrupts_restore(ipl);

}

/** Initialize ns16550.

 *

 * @param devno     Device number.

 * @param port      Virtual/IO address of device's registers.

 * @param inr       Interrupt number.

 * @param cir       Clear interrupt function.

 * @param cir_arg   First argument to cir.

 */

void

ns16550_init(devno_t devno, ioport_t port, inr_t inr, cir_t cir, void *cir_arg)

{

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

    stdin = &kbrd;

    ns16550.devno = devno;

    ns16550.io_port = port;

    irq_initialize(&ns16550_irq);

    ns16550_irq.devno = devno;

    ns16550_irq.inr = inr;

    ns16550_irq.claim = ns16550_claim;

    ns16550_irq.handler = ns16550_irq_handler;

    ns16550_irq.cir = cir;

    ns16550_irq.cir_arg = cir_arg;

    irq_register(&ns16550_irq);

    while ((ns16550_lsr_read(&ns16550) & LSR_DATA_READY))

        ns16550_rbr_read(&ns16550);

    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, port);

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

    /* Enable interrupts */

    ns16550_ier_write(&ns16550, IER_ERBFI);

    ns16550_mcr_write(&ns16550, MCR_OUT2);

    uint8_t c;

    // This switches rbr & ier to mode when accept baudrate constant

    c = ns16550_lcr_read(&ns16550);

    ns16550_lcr_write(&ns16550, 0x80 | c);

    ns16550_rbr_write(&ns16550, 0x0c);

    ns16550_ier_write(&ns16550, 0x00);

    ns16550_lcr_write(&ns16550, c);

    ns16550_grab();

}

/** Process ns16550 interrupt. */

void ns16550_interrupt(void)

{

    ns16550_poll();

}

/* Called from getc(). */

void ns16550_resume(chardev_t *d)

{

}

/* Called from getc(). */

void ns16550_suspend(chardev_t *d)

{

}

char ns16550_key_read(chardev_t *d)

{

    char ch;   

    while(!(ch = active_read_buff_read())) {

        uint8_t x;

        while (!(ns16550_lsr_read(&ns16550) & LSR_DATA_READY));

        x = ns16550_rbr_read(&ns16550);

        if (x != IGNORE_CODE) {

            if (x & KEY_RELEASE)

                key_released(x ^ KEY_RELEASE);

            else

                active_read_key_pressed(x);

        }

    }

    return ch;

}

/** Poll for key press and release events.

 *

 * This function can be used to implement keyboard polling.

 */

void ns16550_poll(void)

{

    while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) {

        uint8_t x;

        x = ns16550_rbr_read(&ns16550);

        if (x != IGNORE_CODE) {

            if (x & KEY_RELEASE)

                key_released(x ^ KEY_RELEASE);

            else

                key_pressed(x);

        }

    }

}

irq_ownership_t ns16550_claim(void *instance)

{

    return (ns16550_lsr_read(&ns16550) & LSR_DATA_READY);

}

void ns16550_irq_handler(irq_t *irq)

{

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

        ipc_irq_send_notif(irq);

    else

        ns16550_interrupt();

}

/** @}

 */