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1844 jermar 1 
/*
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 * Copyright (c) 2009 Jakub Jermar
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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 genarch
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 * @{
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 */
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/**
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 * @file
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 * @brief   NS 16550 serial port / keyboard driver.
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 */
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#include <genarch/kbd/ns16550.h>
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#include <genarch/kbd/key.h>
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#include <genarch/kbd/scanc.h>
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#include <genarch/kbd/scanc_sun.h>
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#include <arch/drivers/kbd.h>
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#include <ddi/irq.h>
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#include <cpu.h>
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#include <arch/asm.h>
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#include <arch.h>
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#include <console/chardev.h>
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#include <console/console.h>
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#include <interrupt.h>
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#include <arch/interrupt.h>
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#include <synch/spinlock.h>
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#include <mm/slab.h>
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#define LSR_DATA_READY  0x01
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/*
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 * These codes read from ns16550 data register are silently ignored.
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 */
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#define IGNORE_CODE 0x7f        /* all keys up */
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static void ns16550_suspend(chardev_t *);
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static void ns16550_resume(chardev_t *);
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static chardev_operations_t ops = {
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    .suspend = ns16550_suspend,
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    .resume = ns16550_resume,
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};
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/** Initialize ns16550.
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 *
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 * @param dev       Addrress of the beginning of the device in I/O space.
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 * @param devno     Device number.
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 * @param inr       Interrupt number.
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 * @param cir       Clear interrupt function.
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 * @param cir_arg   First argument to cir.
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 *
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 * @return      True on success, false on failure.
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 */
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bool
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ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg)
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{
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    ns16550_instance_t *instance;
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    chardev_initialize("ns16550_kbd", &kbrd, &ops);
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    stdin = &kbrd;
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    instance = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);
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    if (!instance)
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        return false;
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    instance->devno = devno;
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    instance->ns16550 = dev;
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    irq_initialize(&instance->irq);
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    instance->irq.devno = devno;
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    instance->irq.inr = inr;
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    instance->irq.claim = ns16550_claim;
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    instance->irq.handler = ns16550_irq_handler;
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    instance->irq.instance = instance;
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    instance->irq.cir = cir;
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    instance->irq.cir_arg = cir_arg;
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    irq_register(&instance->irq);
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    while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))
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        (void) pio_read_8(&dev->rbr);
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    /* Enable interrupts */
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    pio_write_8(&dev->ier, IER_ERBFI);
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    pio_write_8(&dev->mcr, MCR_OUT2);
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    return true;
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}
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/* Called from getc(). */
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void ns16550_resume(chardev_t *d)
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{
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}
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/* Called from getc(). */
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void ns16550_suspend(chardev_t *d)
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{
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}
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irq_ownership_t ns16550_claim(irq_t *irq)
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{
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    ns16550_instance_t *ns16550_instance = irq->instance;
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    ns16550_t *dev = ns16550_instance->ns16550;
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    if (pio_read_8(&dev->lsr) & LSR_DATA_READY)
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        return IRQ_ACCEPT;
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    else
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        return IRQ_DECLINE;
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}
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void ns16550_irq_handler(irq_t *irq)
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{
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    ns16550_instance_t *ns16550_instance = irq->instance;
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    ns16550_t *dev = ns16550_instance->ns16550;
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    if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {
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        uint8_t x;
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        x = pio_read_8(&dev->rbr);
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        if (x != IGNORE_CODE) {
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            if (x & KEY_RELEASE)
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                key_released(x ^ KEY_RELEASE);
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            else
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                key_pressed(x);
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        }
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    }
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}
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/** @}
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 */