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1844 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2006 Jakub Jermar
1844 jermar 3
 * 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 <arch/drivers/ns16550.h>
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#include <ddi/irq.h>
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#include <ipc/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 <sysinfo/sysinfo.h>
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#include <synch/spinlock.h>
1844 jermar 54
 
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#define LSR_DATA_READY  0x01
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1921 jermar 57
/** Structure representing the ns16550. */
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static ns16550_t ns16550;
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/** Structure for ns16550's IRQ. */
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static irq_t ns16550_irq;
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1844 jermar 63
/*
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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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1931 jermar 77
void ns16550_interrupt(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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    ipl_t ipl = interrupts_disable();
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    ns16550_ier_write(&ns16550, IER_ERBFI);     /* enable receiver interrupt */
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    while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY)
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        (void) ns16550_rbr_read(&ns16550);
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    spinlock_lock(&ns16550_irq.lock);
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    ns16550_irq.notif_cfg.notify = false;
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    spinlock_unlock(&ns16550_irq.lock);
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    interrupts_restore(ipl);
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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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    ipl_t ipl = interrupts_disable();
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    spinlock_lock(&ns16550_irq.lock);
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    if (ns16550_irq.notif_cfg.answerbox)
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        ns16550_irq.notif_cfg.notify = true;
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    spinlock_unlock(&ns16550_irq.lock);
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    interrupts_restore(ipl);
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}
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1921 jermar 106
/** Initialize ns16550.
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 *
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 * @param devno Device number.
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 * @param inr Interrupt number.
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 * @param vaddr Virtual address of device's registers.
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 */
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void ns16550_init(devno_t devno, inr_t inr, uintptr_t vaddr)
1844 jermar 113
{
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    chardev_initialize("ns16550_kbd", &kbrd, &ops);
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    stdin = &kbrd;
1880 jermar 116
 
1921 jermar 117
    ns16550.devno = devno;
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    ns16550.reg = (uint8_t *) vaddr;
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    irq_initialize(&ns16550_irq);
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    ns16550_irq.devno = devno;
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    ns16550_irq.inr = inr;
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    ns16550_irq.claim = ns16550_claim;
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    ns16550_irq.handler = ns16550_irq_handler;
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    irq_register(&ns16550_irq);
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1880 jermar 127
    sysinfo_set_item_val("kbd", NULL, true);
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    sysinfo_set_item_val("kbd.type", NULL, KBD_NS16550);
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    sysinfo_set_item_val("kbd.devno", NULL, devno);
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    sysinfo_set_item_val("kbd.inr", NULL, inr);
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    sysinfo_set_item_val("kbd.address.virtual", NULL, vaddr);
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1931 jermar 133
    ns16550_grab();
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}
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1931 jermar 136
/** Process ns16550 interrupt. */
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void ns16550_interrupt(void)
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{
1931 jermar 139
    /* TODO
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     *
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     * ns16550 works in the polled mode so far.
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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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{
148
}
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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 155
char ns16550_key_read(chardev_t *d)
1844 jermar 156
{
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    char ch;   
158
 
159
    while(!(ch = active_read_buff_read())) {
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        uint8_t x;
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        while (!(ns16550_lsr_read(&ns16550) & LSR_DATA_READY))
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            ;
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        x = ns16550_rbr_read(&ns16550);
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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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174
/** Poll for key press and release events.
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 *
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 * This function can be used to implement keyboard polling.
177
 */
178
void ns16550_poll(void)
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{
1931 jermar 180
    ipl_t ipl;
1844 jermar 181
 
1931 jermar 182
    ipl = interrupts_disable();
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    spinlock_lock(&ns16550_irq.lock);
184
 
185
    if (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) {
1932 jermar 186
        if (ns16550_irq.notif_cfg.notify && ns16550_irq.notif_cfg.answerbox) {
1931 jermar 187
            /*
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             * Send IPC notification.
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             */
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            ipc_irq_send_notif(&ns16550_irq);
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            spinlock_unlock(&ns16550_irq.lock);
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            interrupts_restore(ipl);
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            return;
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        }
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    }
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197
    spinlock_unlock(&ns16550_irq.lock);
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    interrupts_restore(ipl);
199
 
1921 jermar 200
    while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) {
1931 jermar 201
        uint8_t x;
202
 
1921 jermar 203
        x = ns16550_rbr_read(&ns16550);
1844 jermar 204
        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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        }
210
    }
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}
212
 
1919 jermar 213
irq_ownership_t ns16550_claim(void)
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{
1931 jermar 215
    return (ns16550_lsr_read(&ns16550) & LSR_DATA_READY);
1919 jermar 216
}
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218
void ns16550_irq_handler(irq_t *irq, void *arg, ...)
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{
1931 jermar 220
    panic("Not yet implemented, ns16550 works in polled mode.\n");
1919 jermar 221
}
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1844 jermar 223
/** @}
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 */