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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.
 */

#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 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 char lchars[0x80] = {
    'a',  's',  'd',  'f',  'h',  'g',  'z',  'x',  'c',  'v',    0,  'b',  'q',  'w',  'e',  'r',
    'y',  't',  '1',  '2',  '3',  '4',  '6',  '5',  '=',  '9',  '7',  '-',  '8',  '0',  ']',  'o',
    'u',  '[',  'i',  'p',   13,  'l',  'j', '\'',  'k',  ';', '\\',  ',',  '/',  'n',  'm',  '.',
      9,   32,  '`',    8,    0,   27,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
      0,  '.',    0,  '*',    0,  '+',    0,    0,    0,    0,    0,  '/',   13,    0,  '-',    0,
      0,    0,  '0',  '1',  '2',  '3',  '4',  '5',  '6',  '7',    0,  '8',  '9',    0,    0,    0,
      0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
      0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0,    0
};


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
};


__u8 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 0;
}


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


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"
    );
}