/*
* 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 <arch/drivers/ns16550.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>
#define LSR_DATA_READY 0x01
/** Structure representing the ns16550. */
static ns16550_t ns16550;
/** Structure for ns16550's IRQ. */
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,
.read = ns16550_key_read
};
void ns16550_interrupt(void);
/** Initialize keyboard and service interrupts using kernel routine */
void ns16550_grab(void)
{
ipl_t ipl = interrupts_disable();
ns16550_ier_write(&ns16550, IER_ERBFI); /* enable receiver interrupt */
while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY)
(void) ns16550_rbr_read(&ns16550);
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 devno Device number.
* @param inr Interrupt number.
* @param vaddr Virtual address of device's registers.
*/
void ns16550_init(devno_t devno, inr_t inr, uintptr_t vaddr)
{
chardev_initialize("ns16550_kbd", &kbrd, &ops);
stdin = &kbrd;
ns16550.devno = devno;
ns16550.reg = (uint8_t *) vaddr;
irq_initialize(&ns16550_irq);
ns16550_irq.devno = devno;
ns16550_irq.inr = inr;
ns16550_irq.claim = ns16550_claim;
ns16550_irq.handler = ns16550_irq_handler;
irq_register(&ns16550_irq);
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, vaddr);
ns16550_grab();
}
/** Process ns16550 interrupt. */
void ns16550_interrupt(void)
{
/* TODO
*
* ns16550 works in the polled mode so far.
*/
}
/* Called from getc(). */
void ns16550_resume(chardev_t *d)
{
}
/* Called from getc(). */
void ns16550_suspend(chardev_t *d)
{
}
char ns16550_key_read(chardev_t *d)
{
char ch;
while(!(ch = active_read_buff_read())) {
uint8_t x;
while (!(ns16550_lsr_read(&ns16550) & LSR_DATA_READY))
;
x = ns16550_rbr_read(&ns16550);
if (x != IGNORE_CODE) {
if (x & KEY_RELEASE)
key_released(x ^ KEY_RELEASE);
else
active_read_key_pressed(x);
}
}
return ch;
}
/** Poll for key press and release events.
*
* This function can be used to implement keyboard polling.
*/
void ns16550_poll(void)
{
ipl_t ipl;
ipl = interrupts_disable();
spinlock_lock(&ns16550_irq.lock);
if (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) {
if (ns16550_irq.notif_cfg.notify && ns16550_irq.notif_cfg.answerbox) {
/*
* Send IPC notification.
*/
ipc_irq_send_notif(&ns16550_irq);
spinlock_unlock(&ns16550_irq.lock);
interrupts_restore(ipl);
return;
}
}
spinlock_unlock(&ns16550_irq.lock);
interrupts_restore(ipl);
while (ns16550_lsr_read(&ns16550) & LSR_DATA_READY) {
uint8_t x;
x = ns16550_rbr_read(&ns16550);
if (x != IGNORE_CODE) {
if (x & KEY_RELEASE)
key_released(x ^ KEY_RELEASE);
else
key_pressed(x);
}
}
}
irq_ownership_t ns16550_claim(void)
{
return (ns16550_lsr_read(&ns16550) & LSR_DATA_READY);
}
void ns16550_irq_handler(irq_t *irq, void *arg, ...)
{
panic("Not yet implemented, ns16550 works in polled mode.\n");
}
/** @}
*/