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3924 svoboda 1 
/*
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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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/** @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   NS16550 port driver.
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 */
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#include <ipc/ipc.h>
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#include <async.h>
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#include <sysinfo.h>
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#include <kbd.h>
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#include <kbd_port.h>
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#include <ddi.h>
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/* NS16550 registers */
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#define RBR_REG     0   /** Receiver Buffer Register. */
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#define IER_REG     1   /** Interrupt Enable Register. */
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#define IIR_REG     2   /** Interrupt Ident Register (read). */
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#define FCR_REG     2   /** FIFO control register (write). */
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#define LCR_REG     3   /** Line Control register. */
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#define MCR_REG     4   /** Modem Control Register. */
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#define LSR_REG     5   /** Line Status Register. */
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#define LSR_DATA_READY  0x01
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static irq_cmd_t ns16550_cmds[] = {
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    {
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        .cmd = CMD_PIO_READ_8,
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        .addr = (void *) 0, /* 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 = LSR_DATA_READY,
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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 = (void *) 0, /* 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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irq_code_t ns16550_kbd = {
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    sizeof(ns16550_cmds) / sizeof(irq_cmd_t),
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    ns16550_cmds
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};
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static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call);
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uint16_t ns16550_port;
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int kbd_port_init(void)
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{
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    async_set_interrupt_received(ns16550_irq_handler);
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    ns16550_port = sysinfo_value("kbd.port");
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    ns16550_kbd.cmds[0].addr = (void *) (ns16550_port + LSR_REG);
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    ns16550_kbd.cmds[3].addr = (void *) (ns16550_port + RBR_REG);
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    ipc_register_irq(sysinfo_value("kbd.inr"), sysinfo_value("kbd.devno"),
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        0, &ns16550_kbd);
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    iospace_enable(task_get_id(), ns16550_port, 8);
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    return 0;
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}
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static void ns16550_irq_handler(ipc_callid_t iid, ipc_call_t *call)
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{
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    int scan_code = IPC_GET_ARG2(*call);
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    kbd_push_scancode(scan_code);
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}
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/**
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 * @}
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 */