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/*

 * Copyright (c) 2001-2004 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   i8042 processor driver.

 *

 * It takes care of low-level keyboard functions.

 */

#include <genarch/kbd/i8042.h>

#include <genarch/kbd/key.h>

#include <genarch/kbd/scanc.h>

#include <genarch/kbd/scanc_pc.h>

#include <arch/drivers/i8042.h>

#include <cpu.h>

#include <arch/asm.h>

#include <arch.h>

#include <console/chardev.h>

#include <console/console.h>

#include <interrupt.h>

#include <sysinfo/sysinfo.h>

#include <ipc/irq.h>

#include <synch/rcu.h>

/* Keyboard commands. */

#define KBD_ENABLE  0xf4

#define KBD_DISABLE 0xf5

#define KBD_ACK     0xfa

/*

 * 60  Write 8042 Command Byte: next data byte written to port 60h is

 *     placed in 8042 command register. Format:

 *

 *    |7|6|5|4|3|2|1|0|8042 Command Byte

 *     | | | | | | | `---- 1=enable output register full interrupt

 *     | | | | | | `----- should be 0

 *     | | | | | `------ 1=set status register system, 0=clear

 *     | | | | `------- 1=override keyboard inhibit, 0=allow inhibit

 *     | | | `-------- disable keyboard I/O by driving clock line low

 *     | | `--------- disable auxiliary device, drives clock line low

 *     | `---------- IBM scancode translation 0=AT, 1=PC/XT

 *     `----------- reserved, should be 0

 */

#define i8042_SET_COMMAND   0x60

#define i8042_COMMAND       0x69

#define i8042_BUFFER_FULL_MASK  0x01

#define i8042_WAIT_MASK     0x02

#define i8042_MOUSE_DATA        0x20

static void i8042_suspend(chardev_t *);

static void i8042_resume(chardev_t *);

static chardev_operations_t ops = {

    .suspend = i8042_suspend,

    .resume = i8042_resume,

    .read = i8042_key_read

};

/** Structure for i8042's IRQ. */

static irq_t i8042_kbd_irq;

static irq_t i8042_mouse_irq;

/** Wait until the controller reads its data. */

static void i8042_wait(void) {

    while (i8042_status_read() & i8042_WAIT_MASK) {

        /* wait */

    }

}

void i8042_grab(void)

{

    ipl_t ipl = interrupts_disable();

    i8042_wait();

    i8042_command_write(i8042_SET_COMMAND);

    i8042_wait();

    i8042_data_write(i8042_COMMAND);

    i8042_wait();

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

    //rcu: atomic update doesn't need reallocation

    rcu_dereference_pointer(i8042_kbd_irq.notif_cfg).notify = false;

    rcu_dereference_pointer(i8042_mouse_irq.notif_cfg).notify = false;

    interrupts_restore(ipl);

}

void i8042_release(void)

{

    ipl_t ipl = interrupts_disable();

    //rcu: atomic update doesn't need reallocation

    spinlock_lock(&i8042_kbd_irq.lock);

    if (rcu_dereference_pointer(i8042_kbd_irq.notif_cfg).answerbox)

        rcu_dereference_pointer(i8042_kbd_irq.notif_cfg).notify = true;

    spinlock_unlock(&i8042_kbd_irq.lock);

    spinlock_lock(&i8042_mouse_irq.lock);

    if (rcu_dereference_pointer(i8042_mouse_irq.notif_cfg).answerbox)

        rcu_dereference_pointer(i8042_mouse_irq.notif_cfg).notify = true;

    spinlock_unlock(&i8042_mouse_irq.lock);

    interrupts_restore(ipl);

}

static irq_ownership_t i8042_claim(void)

{

    return IRQ_ACCEPT;

}

static void i8042_kbd_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 {

        uint8_t x;

        uint8_t status;

        while (((status = i8042_status_read()) & i8042_BUFFER_FULL_MASK)) {

            x = i8042_data_read();

            if ((status & i8042_MOUSE_DATA))

                continue;

            if (x & KEY_RELEASE)

                key_released(x ^ KEY_RELEASE);

            else

                key_pressed(x);

        }

    }

}

static void i8042_mouse_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);

}

/** Initialize i8042. */

void i8042_init(devno_t kbd_devno, inr_t kbd_inr, devno_t mouse_devno, inr_t mouse_inr)

{

    chardev_initialize("i8042_kbd", &kbrd, &ops);

    stdin = &kbrd;

    irq_initialize(&i8042_kbd_irq);

    i8042_kbd_irq.devno = kbd_devno;

    i8042_kbd_irq.inr = kbd_inr;

    i8042_kbd_irq.claim = i8042_claim;

    i8042_kbd_irq.handler = i8042_kbd_irq_handler;

    irq_register(&i8042_kbd_irq);

    irq_initialize(&i8042_mouse_irq);

    i8042_mouse_irq.devno = mouse_devno;

    i8042_mouse_irq.inr = mouse_inr;

    i8042_mouse_irq.claim = i8042_claim;

    i8042_mouse_irq.handler = i8042_mouse_irq_handler;

    irq_register(&i8042_mouse_irq);

    trap_virtual_enable_irqs(1 << kbd_inr);

    trap_virtual_enable_irqs(1 << mouse_inr);

    /*

     * Clear input buffer.

     * Number of iterations is limited to prevent infinite looping.

     */

    int i;

    for (i = 0; (i8042_status_read() & i8042_BUFFER_FULL_MASK) && i < 100; i++) {

        i8042_data_read();

    }

    sysinfo_set_item_val("kbd", NULL, true);

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

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

    sysinfo_set_item_val("mouse", NULL, true);

    sysinfo_set_item_val("mouse.devno", NULL, mouse_devno);

    sysinfo_set_item_val("mouse.inr", NULL, mouse_inr);

    i8042_grab();

}

/* Called from getc(). */

void i8042_resume(chardev_t *d)

{

}

/* Called from getc(). */

void i8042_suspend(chardev_t *d)

{

}

char i8042_key_read(chardev_t *d)

{

    char ch;   

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

        uint8_t x;

        while (!(i8042_status_read() & i8042_BUFFER_FULL_MASK))

            ;

        x = i8042_data_read();

        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 i8042_poll(void)

{

    uint8_t x;

    while (((x = i8042_status_read() & i8042_BUFFER_FULL_MASK))) {

        x = i8042_data_read();

        if (x & KEY_RELEASE)

            key_released(x ^ KEY_RELEASE);

        else

            key_pressed(x);

    }

}

/** @}

 */