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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;

}

/**

 * @}

 */