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/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * 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 i8042 port driver.
 */

#include <ddi.h>
#include <libarch/ddi.h>
#include <ipc/ipc.h>
#include <async.h>
#include <unistd.h>
#include <sysinfo.h>
#include <kbd_port.h>
#include <kbd.h>
#include "i8042.h"

/* Interesting bits for status register */
#define i8042_OUTPUT_FULL  0x1
#define i8042_INPUT_FULL   0x2
#define i8042_MOUSE_DATA   0x20

/* Command constants */
#define i8042_CMD_KBD 0x60
#define i8042_CMD_MOUSE  0xd4

/* Keyboard cmd byte */
#define i8042_KBD_IE        0x1
#define i8042_MOUSE_IE      0x2
#define i8042_KBD_DISABLE   0x10
#define i8042_MOUSE_DISABLE 0x20
#define i8042_KBD_TRANSLATE 0x40

/* Mouse constants */
#define MOUSE_OUT_INIT  0xf4
#define MOUSE_ACK       0xfa

static irq_cmd_t i8042_cmds[] = {
    {
        .cmd = CMD_PIO_READ_8,
        .addr = NULL,   /* will be patched in run-time */
        .dstarg = 1
    },
    {
        .cmd = CMD_BTEST,
        .value = i8042_OUTPUT_FULL,
        .srcarg = 1,
        .dstarg = 3
    },
    {
        .cmd = CMD_PREDICATE,
        .value = 2,
        .srcarg = 3
    },
    {
        .cmd = CMD_PIO_READ_8,
        .addr = NULL,   /* will be patched in run-time */
        .dstarg = 2
    },
    {
        .cmd = CMD_ACCEPT
    }
};

static irq_code_t i8042_kbd = {
    sizeof(i8042_cmds) / sizeof(irq_cmd_t),
    i8042_cmds
};

static uintptr_t i8042_physical;
static uintptr_t i8042_kernel;
static i8042_t * i8042;

static void wait_ready(void) {
    while (pio_read_8(&i8042->status) & i8042_INPUT_FULL)
        ;
}

static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call);

int kbd_port_init(void)
{
    int mouseenabled = 0;
    void *vaddr;

    i8042_physical = sysinfo_value("kbd.address.physical");
    i8042_kernel = sysinfo_value("kbd.address.kernel");
    if (pio_enable((void *) i8042_physical, sizeof(i8042_t), &vaddr) != 0)
        return -1;
    i8042 = vaddr;

    async_set_interrupt_received(i8042_irq_handler);

    /* Disable kbd, enable mouse */
    pio_write_8(&i8042->status, i8042_CMD_KBD);
    wait_ready();
    pio_write_8(&i8042->status, i8042_CMD_KBD);
    wait_ready();
    pio_write_8(&i8042->data, i8042_KBD_DISABLE);
    wait_ready();

    /* Flush all current IO */
    while (pio_read_8(&i8042->status) & i8042_OUTPUT_FULL)
        (void) pio_read_8(&i8042->data);
    
    /* Enable kbd */
    i8042_kbd.cmds[0].addr = &((i8042_t *) i8042_kernel)->status;
    i8042_kbd.cmds[3].addr = &((i8042_t *) i8042_kernel)->data;
    ipc_register_irq(sysinfo_value("kbd.inr"), sysinfo_value("kbd.devno"), 0, &i8042_kbd);

    int newcontrol = i8042_KBD_IE | i8042_KBD_TRANSLATE;
    if (mouseenabled)
        newcontrol |= i8042_MOUSE_IE;
    
    pio_write_8(&i8042->status, i8042_CMD_KBD);
    wait_ready();
    pio_write_8(&i8042->data, newcontrol);
    wait_ready();
    
    return 0;
}

static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call)
{
    int status = IPC_GET_ARG1(*call);

    if ((status & i8042_MOUSE_DATA))
        return;

    int scan_code = IPC_GET_ARG2(*call);

    kbd_push_scancode(scan_code);
    return;
}

/**
 * @}
 */