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1844 jermar 1
/*
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 * Copyright (C) 2001-2004 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/ns16550.h>
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#include <irq.h>
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#include <arch/interrupt.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 <typedefs.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 <sysinfo/sysinfo.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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    .read = ns16550_key_read
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};
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void ns16550_interrupt(int n, istate_t *istate);
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void ns16550_wait(void);
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/** Initialize keyboard and service interrupts using kernel routine */
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void ns16550_grab(void)
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{
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    /* TODO */
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}
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/** Resume the former interrupt vector */
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void ns16550_release(void)
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{
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    /* TODO */
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}
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/** Initialize ns16550. */
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void ns16550_init(void)
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{
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    ns16550_grab();
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    chardev_initialize("ns16550_kbd", &kbrd, &ops);
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    stdin = &kbrd;
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    sysinfo_set_item_val("kbd", NULL, true);
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    sysinfo_set_item_val("kbd.irq", NULL, 0);
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    sysinfo_set_item_val("kbd.address.virtual", NULL, (uintptr_t) kbd_virt_address);
1911 jermar 94
 
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    ns16550_ier_write(IER_ERBFI);               /* enable receiver interrupt */
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    while (ns16550_lsr_read() & LSR_DATA_READY)
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        (void) ns16550_rbr_read();
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}
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/** Process ns16550 interrupt.
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 *
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 * @param n Interrupt vector.
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 * @param istate Interrupted state.
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 */
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void ns16550_interrupt(int n, istate_t *istate)
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{
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    /* TODO */
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}
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/** Wait until the controller reads its data. */
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void ns16550_wait(void)
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{
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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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1896 jermar 126
char ns16550_key_read(chardev_t *d)
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{
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    char ch;   
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    while(!(ch = active_read_buff_read())) {
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        uint8_t x;
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        while (!(ns16550_lsr_read() & LSR_DATA_READY))
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            ;
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        x = ns16550_rbr_read();
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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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                active_read_key_pressed(x);
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        }
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    }
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    return ch;
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}
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/** Poll for key press and release events.
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 *
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 * This function can be used to implement keyboard polling.
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 */
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void ns16550_poll(void)
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{
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    uint8_t x;
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1911 jermar 153
    while (ns16550_lsr_read() & LSR_DATA_READY) {
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        x = ns16550_rbr_read();
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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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1919 jermar 164
irq_ownership_t ns16550_claim(void)
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{
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    /* TODO */
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    return IRQ_ACCEPT;
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}
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void ns16550_irq_handler(irq_t *irq, void *arg, ...)
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{
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    panic("Not yet implemented.\n");
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}
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/** @}
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 */