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3923 svoboda 1 
/*
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 * Copyright (c) 2001-2004 Jakub Jermar
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 * Copyright (c) 2006 Josef Cejka
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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3924 svoboda 30 
/** @addtogroup kbd_port
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 * @ingroup kbd
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 * @{
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 */
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/** @file
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 * @brief i8042 port driver.
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 */
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4345 svoboda 38 
#include <ddi.h>
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#include <libarch/ddi.h>
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#include <ipc/ipc.h>
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#include <async.h>
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#include <unistd.h>
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#include <sysinfo.h>
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#include <kbd_port.h>
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#include <kbd.h>
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#include "i8042.h"
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/* Interesting bits for status register */
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#define i8042_OUTPUT_FULL  0x1
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#define i8042_INPUT_FULL   0x2
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#define i8042_MOUSE_DATA   0x20
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/* Command constants */
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#define i8042_CMD_KBD 0x60
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#define i8042_CMD_MOUSE  0xd4
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/* Keyboard cmd byte */
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#define i8042_KBD_IE        0x1
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#define i8042_MOUSE_IE      0x2
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#define i8042_KBD_DISABLE   0x10
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#define i8042_MOUSE_DISABLE 0x20
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#define i8042_KBD_TRANSLATE 0x40
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/* Mouse constants */
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#define MOUSE_OUT_INIT  0xf4
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#define MOUSE_ACK       0xfa
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static irq_cmd_t i8042_cmds[] = {
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    {
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        .cmd = CMD_PIO_READ_8,
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        .addr = NULL,   /* will be patched in run-time */
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        .dstarg = 1
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    },
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    {
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        .cmd = CMD_BTEST,
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        .value = i8042_OUTPUT_FULL,
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        .srcarg = 1,
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        .dstarg = 3
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    },
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    {
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        .cmd = CMD_PREDICATE,
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        .value = 2,
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        .srcarg = 3
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    },
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    {
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        .cmd = CMD_PIO_READ_8,
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        .addr = NULL,   /* will be patched in run-time */
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        .dstarg = 2
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    },
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    {
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        .cmd = CMD_ACCEPT
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    }
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};
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static irq_code_t i8042_kbd = {
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    sizeof(i8042_cmds) / sizeof(irq_cmd_t),
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    i8042_cmds
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};
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static uintptr_t i8042_physical;
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static uintptr_t i8042_kernel;
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static i8042_t * i8042;
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static void wait_ready(void) {
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    while (pio_read_8(&i8042->status) & i8042_INPUT_FULL)
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        ;
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}
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static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call);
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int kbd_port_init(void)
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{
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    int mouseenabled = 0;
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    void *vaddr;
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    i8042_physical = sysinfo_value("kbd.address.physical");
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    i8042_kernel = sysinfo_value("kbd.address.kernel");
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    if (pio_enable((void *) i8042_physical, sizeof(i8042_t), &vaddr) != 0)
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        return -1;
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    i8042 = vaddr;
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    async_set_interrupt_received(i8042_irq_handler);
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    /* Disable kbd, enable mouse */
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    pio_write_8(&i8042->status, i8042_CMD_KBD);
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    wait_ready();
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    pio_write_8(&i8042->status, i8042_CMD_KBD);
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    wait_ready();
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    pio_write_8(&i8042->data, i8042_KBD_DISABLE);
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    wait_ready();
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    /* Flush all current IO */
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    while (pio_read_8(&i8042->status) & i8042_OUTPUT_FULL)
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        (void) pio_read_8(&i8042->data);
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    /* Enable kbd */
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    i8042_kbd.cmds[0].addr = &((i8042_t *) i8042_kernel)->status;
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    i8042_kbd.cmds[3].addr = &((i8042_t *) i8042_kernel)->data;
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    ipc_register_irq(sysinfo_value("kbd.inr"), sysinfo_value("kbd.devno"), 0, &i8042_kbd);
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    int newcontrol = i8042_KBD_IE | i8042_KBD_TRANSLATE;
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    if (mouseenabled)
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        newcontrol |= i8042_MOUSE_IE;
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    pio_write_8(&i8042->status, i8042_CMD_KBD);
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    wait_ready();
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    pio_write_8(&i8042->data, newcontrol);
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    wait_ready();
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    return 0;
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}
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static void i8042_irq_handler(ipc_callid_t iid, ipc_call_t *call)
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{
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    int status = IPC_GET_ARG1(*call);
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    if ((status & i8042_MOUSE_DATA))
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        return;
3923 svoboda 159 
 
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    int scan_code = IPC_GET_ARG2(*call);
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    kbd_push_scancode(scan_code);
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    return;
3923 svoboda 164 
}
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/**
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 * @}
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 */