Subversion Repositories HelenOS

/*
 * Copyright (c) 2001-2006 Jakub Jermar
 * 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 genarch 
 * @{
 */
/**
 * @file
 * @brief   NS 16550 serial port / keyboard driver.
 */

#include <genarch/kbd/ns16550.h>
#include <genarch/kbd/key.h>
#include <genarch/kbd/scanc.h>
#include <genarch/kbd/scanc_sun.h>
#include <arch/drivers/kbd.h>
#include <ddi/irq.h>
#include <ipc/irq.h>
#include <cpu.h>
#include <arch/asm.h>
#include <arch.h>
#include <console/chardev.h>
#include <console/console.h>
#include <interrupt.h>
#include <arch/interrupt.h>
#include <sysinfo/sysinfo.h>
#include <synch/spinlock.h>
#include <mm/slab.h>

#define LSR_DATA_READY  0x01

static irq_t *ns16550_irq;

/*
 * These codes read from ns16550 data register are silently ignored.
 */
#define IGNORE_CODE 0x7f        /* all keys up */

static void ns16550_suspend(chardev_t *);
static void ns16550_resume(chardev_t *);

static chardev_operations_t ops = {
    .suspend = ns16550_suspend,
    .resume = ns16550_resume,
};

/** Initialize keyboard and service interrupts using kernel routine */
void ns16550_grab(void)
{
    ipl_t ipl = interrupts_disable();
    spinlock_lock(&ns16550_irq->lock);
    ns16550_irq->notif_cfg.notify = false;
    spinlock_unlock(&ns16550_irq->lock);
    interrupts_restore(ipl);
}

/** Resume the former interrupt vector */
void ns16550_release(void)
{
    ipl_t ipl = interrupts_disable();
    spinlock_lock(&ns16550_irq->lock);
    if (ns16550_irq->notif_cfg.answerbox)
        ns16550_irq->notif_cfg.notify = true;
    spinlock_unlock(&ns16550_irq->lock);
    interrupts_restore(ipl);
}

/** Initialize ns16550.
 *
 * @param dev       Addrress of the beginning of the device in I/O space.
 * @param devno     Device number.
 * @param inr       Interrupt number.
 * @param cir       Clear interrupt function.
 * @param cir_arg   First argument to cir.
 *
 * @return      True on success, false on failure.
 */
bool
ns16550_init(ns16550_t *dev, devno_t devno, inr_t inr, cir_t cir, void *cir_arg)
{
    ns16550_instance_t *instance;

    chardev_initialize("ns16550_kbd", &kbrd, &ops);
    stdin = &kbrd;
    
    instance = malloc(sizeof(ns16550_instance_t), FRAME_ATOMIC);
    if (!instance)
        return false;

    instance->devno = devno;
    instance->ns16550 = dev;
    
    irq_initialize(&instance->irq);
    instance->irq.devno = devno;
    instance->irq.inr = inr;
    instance->irq.claim = ns16550_claim;
    instance->irq.handler = ns16550_irq_handler;
    instance->irq.instance = instance;
    instance->irq.cir = cir;
    instance->irq.cir_arg = cir_arg;
    irq_register(&instance->irq);

    ns16550_irq = &instance->irq;   /* TODO: remove me soon */
    
    while ((pio_read_8(&dev->lsr) & LSR_DATA_READY))
        (void) pio_read_8(&dev->rbr);
    
    sysinfo_set_item_val("kbd", NULL, true);
    sysinfo_set_item_val("kbd.type", NULL, KBD_NS16550);
    sysinfo_set_item_val("kbd.devno", NULL, devno);
    sysinfo_set_item_val("kbd.inr", NULL, inr);
    sysinfo_set_item_val("kbd.address.virtual", NULL, (uintptr_t) dev);
    sysinfo_set_item_val("kbd.port", NULL, (uintptr_t) dev);
    
    /* Enable interrupts */
    pio_write_8(&dev->ier, IER_ERBFI);
    pio_write_8(&dev->mcr, MCR_OUT2);
    
    ns16550_grab();
    
    return true;
}

/* Called from getc(). */
void ns16550_resume(chardev_t *d)
{
}

/* Called from getc(). */
void ns16550_suspend(chardev_t *d)
{
}

irq_ownership_t ns16550_claim(void *instance)
{
    ns16550_instance_t *ns16550_instance = instance;
    ns16550_t *dev = ns16550_instance->ns16550;

    if (pio_read_8(&dev->lsr) & LSR_DATA_READY)
        return IRQ_ACCEPT;
    else
        return IRQ_DECLINE;
}

void ns16550_irq_handler(irq_t *irq)
{
    if (irq->notif_cfg.notify && irq->notif_cfg.answerbox) {
        /*
         * This will hopefully go to the IRQ dispatch code soon.
         */
        ipc_irq_send_notif(irq);
        return;
    }

    ns16550_instance_t *ns16550_instance = irq->instance;
    ns16550_t *dev = ns16550_instance->ns16550;

    if (pio_read_8(&dev->lsr) & LSR_DATA_READY) {
        uint8_t x;
        
        x = pio_read_8(&dev->rbr);
        
        if (x != IGNORE_CODE) {
            if (x & KEY_RELEASE)
                key_released(x ^ KEY_RELEASE);
            else
                key_pressed(x);
        }
    }

}

/** @}
 */