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/*
 * Copyright (C) 2006 Martin Decky
 * 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 ppc32   
 * @{
 */
/** @file
 */

#include <arch/drivers/cuda.h>
#include <arch/asm.h>
#include <console/console.h>
#include <console/chardev.h>
#include <arch/drivers/pic.h>
#include <sysinfo/sysinfo.h>
#include <interrupt.h>
#include <stdarg.h>

#define SPECIAL     '?'

#define PACKET_ADB  0x00
#define PACKET_CUDA 0x01

#define CUDA_POWERDOWN 0x0a

#define RS 0x200
#define B (0 * RS)
#define A (1 * RS)
#define SR (10 * RS)
#define ACR (11 * RS)

#define SR_OUT 0x10
#define TACK 0x10
#define TIP 0x20


static volatile __u8 *cuda = NULL;
static iroutine vector;


static char lchars[0x80] = {
    'a',
    's',
    'd',
    'f',
    'h',
    'g',
    'z',
    'x',
    'c',
    'v', 
    SPECIAL,
    'b',
    'q',
    'w',
    'e',
    'r',
    'y',
    't',
    '1',
    '2',
    '3',
    '4',
    '6',
    '5',
    '=',
    '9',
    '7',
    '-',
    '8',
    '0',
    ']',
    'o',
    'u',
    '[',
    'i', 
    'p',
    '\n',    /* Enter */
    'l',
    'j',
    '\'',
    'k',
    ';',
    '\\',
    ',',
    '/',
    'n',
    'm',
    '.',
    '\t',    /* Tab */
    ' ',
    '`',
    '\b',    /* Backspace */
    SPECIAL,
    SPECIAL, /* Escape */
    SPECIAL, /* Ctrl */
    SPECIAL, /* Alt */
    SPECIAL, /* Shift */
    SPECIAL, /* Caps-Lock */
    SPECIAL, /* RAlt */
    SPECIAL, /* Left */
    SPECIAL, /* Right */
    SPECIAL, /* Down */
    SPECIAL, /* Up */
    SPECIAL, 
    SPECIAL,
    '.',     /* Keypad . */
    SPECIAL, 
    '*',     /* Keypad * */
    SPECIAL,
    '+',     /* Keypad + */
    SPECIAL,
    SPECIAL, /* NumLock */
    SPECIAL,
    SPECIAL,
    SPECIAL,
    '/',     /* Keypad / */
    '\n',    /* Keypad Enter */
    SPECIAL,
    '-',     /* Keypad - */
    SPECIAL,
    SPECIAL,
    SPECIAL,
    '0',     /* Keypad 0 */
    '1',     /* Keypad 1 */
    '2',     /* Keypad 2 */
    '3',     /* Keypad 3 */
    '4',     /* Keypad 4 */
    '5',     /* Keypad 5 */
    '6',     /* Keypad 6 */
    '7',     /* Keypad 7 */
    SPECIAL,
    '8',     /* Keypad 8 */
    '9',     /* Keypad 9 */
    SPECIAL,
    SPECIAL,
    SPECIAL,
    SPECIAL, /* F5 */
    SPECIAL, /* F6 */
    SPECIAL, /* F7 */
    SPECIAL, /* F3 */
    SPECIAL, /* F8 */
    SPECIAL, /* F9 */
    SPECIAL,
    SPECIAL, /* F11 */
    SPECIAL,
    SPECIAL, /* F13 */
    SPECIAL,
    SPECIAL, /* ScrollLock */
    SPECIAL,
    SPECIAL, /* F10 */
    SPECIAL,
    SPECIAL, /* F12 */
    SPECIAL,
    SPECIAL, /* Pause */
    SPECIAL, /* Insert */
    SPECIAL, /* Home */
    SPECIAL, /* PageUp */
    SPECIAL, /* Delete */
    SPECIAL, /* F4 */
    SPECIAL, /* End */
    SPECIAL, /* F2 */
    SPECIAL, /* PageDown */
    SPECIAL  /* F1 */
};


void send_packet(const __u8 kind, index_t count, ...);


static void receive_packet(__u8 *kind, index_t count, __u8 data[])
{
    cuda[B] = cuda[B] & ~TIP;
    *kind = cuda[SR];
    
    index_t i;
    for (i = 0; i < count; i++)
        data[i] = cuda[SR];
    
    cuda[B] = cuda[B] | TIP;
}


/* Called from getc(). */
static void cuda_resume(chardev_t *d)
{
}


/* Called from getc(). */
static void cuda_suspend(chardev_t *d)
{
}


static char key_read(chardev_t *d)
{
    char ch;
    
    ch = 0;
    return ch;
}


static chardev_t kbrd;
static chardev_operations_t ops = {
    .suspend = cuda_suspend,
    .resume = cuda_resume,
    .read = key_read
};


int cuda_get_scancode(void)
{
    __u8 kind;
    __u8 data[4];
    
    receive_packet(&kind, 4, data);
    
    if ((kind == PACKET_ADB) && (data[0] == 0x40) && (data[1] == 0x2c))
        return data[2];
    
    return -1;
}

static void cuda_irq(int n, istate_t *istate)
{
    int scan_code = cuda_get_scancode();
    
    if (scan_code != -1) {
        __u8 scancode = (__u8) scan_code;
        if ((scancode & 0x80) != 0x80)
            chardev_push_character(&kbrd, lchars[scancode & 0x7f]);
    }
}


/** Initialize keyboard and service interrupts using kernel routine */
void cuda_grab(void)
{
    vector = int_register(CUDA_IRQ, "cuda", cuda_irq);
}


/** Resume the former interrupt vector */
void cuda_release(void)
{
    if (vector)
        int_register(CUDA_IRQ, "user_interrupt", vector);
}


void cuda_init(__address base, size_t size)
{
    cuda = (__u8 *) hw_map(base, size);
    
    int_register(CUDA_IRQ, "cuda", cuda_irq);
    pic_enable_interrupt(CUDA_IRQ);
    
    chardev_initialize("cuda_kbd", &kbrd, &ops);
    stdin = &kbrd;
    
    sysinfo_set_item_val("cuda", NULL, true);
    sysinfo_set_item_val("cuda.irq", NULL, CUDA_IRQ);
}


void send_packet(const __u8 kind, index_t count, ...)
{
    index_t i;
    va_list va;
    
    cuda[B] = cuda[B] | TIP;
    cuda[ACR] = cuda[ACR] | SR_OUT;
    cuda[SR] = kind;
    cuda[B] = cuda[B] & ~TIP;
    
    va_start(va, count);
    
    for (i = 0; i < count; i++) {
        cuda[ACR] = cuda[ACR] | SR_OUT;
        cuda[SR] = va_arg(va, int);
        cuda[B] = cuda[B] | TACK;
    }
    
    va_end(va);
    
    cuda[B] = cuda[B] | TIP;
}


void cpu_halt(void) {
#ifdef CONFIG_POWEROFF
    send_packet(PACKET_CUDA, 1, CUDA_POWERDOWN);
#endif
    asm volatile (
        "b 0\n"
    );
}

/** @}
 */