xref: /src/sys/arch/atari/dev/kbd.c

/*	$NetBSD: kbd.c,v 1.4 1995/06/25 19:05:26 leo Exp $	*/

/*
 * Copyright (c) 1995 Leo Weppelman
 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <dev/cons.h>
#include <machine/cpu.h>
#include <machine/iomap.h>
#include <machine/mfp.h>
#include <machine/acia.h>
#include <machine/video.h>
#include <atari/dev/itevar.h>
#include <atari/dev/kbdreg.h>
#include <atari/dev/event_var.h>
#include <atari/dev/vuid_event.h>

/*
 * The ringbuffer is the interface between the hard and soft interrupt handler.
 * The hard interrupt runs straight from the MFP interrupt.
 */
#define KBD_RING_SIZE	256   /* Sz of input ring buffer, must be power of 2 */
#define KBD_RING_MASK	255   /* Modulo mask for above			     */

static u_char		kbd_ring[KBD_RING_SIZE];
static volatile u_int	kbd_rbput = 0;	/* 'put' index			*/
static u_int		kbd_rbget = 0;	/* 'get' index			*/
static u_char		kbd_soft  = 0;	/* 1: Softint has been scheduled*/

struct kbd_softc {
	int		k_event_mode;	/* if 1, collect events,	*/
					/*   else pass to ite		*/
	struct evvar	k_events;	/* event queue state		*/
	u_char		k_soft_cs;	/* control-reg. copy		*/
	u_char		k_package[20];	/* XXX package being build	*/
	u_char		k_pkg_size;	/* Size of the package		*/
	u_char		k_pkg_idx;
	u_char		*k_sendp;	/* Output pointer		*/
	int		k_send_cnt;	/* Chars left for output	*/
};

static struct kbd_softc kbd_softc;

void	kbd_write __P((u_char *, int));

static void kbdsoft __P((void));
static void kbdattach __P((struct device *, struct device *, void *));
static int  kbdmatch __P((struct device *, struct cfdata *, void *));
static int  kbd_write_poll __P((u_char *, int));
static void kbd_pkg_start __P((struct kbd_softc *, u_char));

struct cfdriver kbdcd = {
	NULL, "kbd", (cfmatch_t)kbdmatch, kbdattach,
	DV_DULL, sizeof(struct device), NULL, 0 };


/*ARGSUSED*/
static	int
kbdmatch(pdp, cfp, auxp)
struct	device *pdp;
struct	cfdata *cfp;
void	*auxp;
{
	if (!strcmp((char *)auxp, "kbd"))
		return (1);
	return (0);
}

/*ARGSUSED*/
static void
kbdattach(pdp, dp, auxp)
struct	device *pdp, *dp;
void	*auxp;
{
	int	timeout;
	u_char	kbd_rst[]  = { 0x80, 0x01 };
	u_char	kbd_icmd[] = { 0x12, 0x15 };

	/*
	 * Disable keyboard interrupts from MFP
	 */
	MFP->mf_ierb &= ~IB_AINT;

	/*
	 * Reset ACIA and intialize to:
	 *    divide by 16, 8 data, 1 stop, no parity, enable RX interrupts
	 */
	KBD->ac_cs = A_RESET;
	delay(100);	/* XXX: enough? */
	KBD->ac_cs = kbd_softc.k_soft_cs = KBD_INIT | A_RXINT;

	/*
	 * Clear error conditions
	 */
	while (KBD->ac_cs & (A_IRQ|A_RXRDY))
		timeout = KBD->ac_da;

	/*
	 * Now send the reset string, and read+ignore it's response
	 */
	if (!kbd_write_poll(kbd_rst, 2))
		printf("kbd: error cannot reset keyboard\n");
	for (timeout = 1000; timeout > 0; timeout--) {
		if (KBD->ac_cs & (A_IRQ|A_RXRDY)) {
			timeout = KBD->ac_da;
			timeout = 100;
		}
		delay(100);
	}
	/*
	 * Send init command: disable mice & joysticks
	 */
	kbd_write_poll(kbd_icmd, sizeof(kbd_icmd));

	printf("\n");
}

/* definitions for atari keyboard encoding. */
#define KEY_CODE(c)	((u_char)(c) & 0x7f)
#define KEY_UP(c)	((u_char)(c) & 0x80)
#define	IS_KEY(c)	((u_char)(c) < 0xf6)

void
kbdenable()
{
	int	s, code;

	s = spltty();

	/*
	 * Clear error conditions...
	 */
	while (KBD->ac_cs & (A_IRQ|A_RXRDY))
		code = KBD->ac_da;
	/*
	 * Enable interrupts from MFP
	 */
	MFP->mf_iprb &= ~IB_AINT;
	MFP->mf_ierb |= IB_AINT;
	MFP->mf_imrb |= IB_AINT;

	kbd_softc.k_event_mode   = 0;
	kbd_softc.k_events.ev_io = 0;
	kbd_softc.k_pkg_size     = 0;
	splx(s);
}

int kbdopen(dev_t dev, int flags, int mode, struct proc *p)
{
	int s, error;

	if (kbd_softc.k_events.ev_io)
		return EBUSY;

	kbd_softc.k_events.ev_io = p;
	ev_init(&kbd_softc.k_events);
	return (0);
}

int
kbdclose(dev_t dev, int flags, int mode, struct proc *p)
{
	/* Turn off event mode, dump the queue */
	kbd_softc.k_event_mode = 0;
	ev_fini(&kbd_softc.k_events);
	kbd_softc.k_events.ev_io = NULL;
	return (0);
}

int
kbdread(dev_t dev, struct uio *uio, int flags)
{
	return ev_read(&kbd_softc.k_events, uio, flags);
}

int
kbdioctl(dev_t dev,u_long cmd,register caddr_t data,int flag,struct proc *p)
{
	register struct kbd_softc *k = &kbd_softc;

	switch (cmd) {
		case KIOCTRANS:
			if (*(int *)data == TR_UNTRANS_EVENT)
				return 0;
			break;

		case KIOCGTRANS:
			/*
			 * Get translation mode
			 */
			*(int *)data = TR_UNTRANS_EVENT;
			return 0;

		case KIOCSDIRECT:
			k->k_event_mode = *(int *)data;
			return 0;

		case FIONBIO:	/* we will remove this someday (soon???) */
			return 0;

		case FIOASYNC:
			k->k_events.ev_async = *(int *)data != 0;
				return 0;

		case TIOCSPGRP:
			if (*(int *)data != k->k_events.ev_io->p_pgid)
				return EPERM;
			return 0;

		default:
			return ENOTTY;
	}

	/*
	 * We identified the ioctl, but we do not handle it.
	 */
	return EOPNOTSUPP;		/* misuse, but what the heck */
}

int
kbdselect (dev_t dev, int rw, struct proc *p)
{
  return ev_select (&kbd_softc.k_events, rw, p);
}

/*
 * Keyboard interrupt handler called straight from MFP at spl6.
 */
int
kbdintr(sr)
int sr;	/* sr at time of interrupt	*/
{
	int	code;
	int	got_char = 0;

	/*
	 * There may be multiple keys available. Read them all.
	 */
	while (KBD->ac_cs & (A_RXRDY|A_OE|A_PE)) {
		got_char = 1;
		if (KBD->ac_cs & (A_OE|A_PE)) {
			code = KBD->ac_da;	/* Silently ignore errors */
			continue;
		}
		kbd_ring[kbd_rbput++ & KBD_RING_MASK] = KBD->ac_da;
	}

	/*
	 * If characters are waiting for transmit, send them.
	 */
	if ((kbd_softc.k_soft_cs & A_TXINT) && (KBD->ac_cs & A_TXRDY)) {
		if (kbd_softc.k_sendp != NULL)
			KBD->ac_da = *kbd_softc.k_sendp++;
		if (--kbd_softc.k_send_cnt <= 0) {
			/*
			 * The total package has been transmitted,
			 * wakeup anyone waiting for it.
			 */
			KBD->ac_cs = (kbd_softc.k_soft_cs &= ~A_TXINT);
			kbd_softc.k_sendp    = NULL;
			kbd_softc.k_send_cnt = 0;
			wakeup((caddr_t)&kbd_softc.k_send_cnt);
		}
	}

	/*
	 * Activate software-level to handle possible input.
	 */
	if (got_char) {
		if (!BASEPRI(sr)) {
			if (!kbd_soft++)
				add_sicallback(kbdsoft, 0, 0);
		} else {
			spl1();
			kbdsoft();
		}
	}
}

/*
 * Keyboard soft interrupt handler
 */
void
kbdsoft()
{
	int			s;
	u_char			code;
	struct kbd_softc	*k = &kbd_softc;
	struct firm_event	*fe;
	int			put;
	int			n, get;

	kbd_soft = 0;
	get      = kbd_rbget;

	for (;;) {
		n = kbd_rbput;
		if (get == n) /* We're done	*/
			break;
		n -= get;
		if (n > KBD_RING_SIZE) { /* Ring buffer overflow	*/
			get += n - KBD_RING_SIZE;
			n    = KBD_RING_SIZE;
		}
		while (--n >= 0) {
			code = kbd_ring[get++ & KBD_RING_MASK];

			/*
			 * If collecting a package, stuff it in and
			 * continue.
			 */
			if (k->k_pkg_size && (k->k_pkg_idx < k->k_pkg_size)) {
				k->k_package[k->k_pkg_idx++] = code;
				if (k->k_pkg_idx == k->k_pkg_size) {
				    k->k_pkg_size = 0;
				    /*
				     * Package is complete, we can now
				     * send it to the mouse driver...
				     */
				    mouse_soft(k->k_package, k->k_pkg_size);
				}
				continue;
			}
			/*
			 * If this is a package header, init pkg. handling.
			 */
			if (!IS_KEY(code)) {
				kbd_pkg_start(k, code);
				continue;
			}
			/*
			 * if not in event mode, deliver straight to ite to
			 * process key stroke
			 */
			if (!k->k_event_mode) {
				/* Gets to spltty() by itself	*/
				ite_filter(code, ITEFILT_TTY);
				continue;
			}

			/*
			 * Keyboard is generating events.  Turn this keystroke
			 * into an event and put it in the queue.  If the queue
			 * is full, the keystroke is lost (sorry!).
			 */
			s = spltty();
			put = k->k_events.ev_put;
			fe  = &k->k_events.ev_q[put];
			put = (put + 1) % EV_QSIZE;
			if (put == k->k_events.ev_get) {
				log(LOG_WARNING,
					"keyboard event queue overflow\n");
				splx(s);
				continue;
			}
			fe->id             = KEY_CODE(code);
			fe->value          = KEY_UP(code) ? VKEY_UP : VKEY_DOWN;
			fe->time           = time;
			k->k_events.ev_put = put;
			EV_WAKEUP(&k->k_events);
			splx(s);
		}
		kbd_rbget = get;
	}
}

static	char sound[] = {
	0xA8,0x01,0xA9,0x01,0xAA,0x01,0x00,
	0xF8,0x10,0x10,0x10,0x00,0x20,0x03
};

int
kbdbell()
{
	register int	i, sps;

	sps = spltty();
	for (i = 0; i < sizeof(sound); i++) {
		SOUND->sd_selr = i;
		SOUND->sd_wdat = sound[i];
	}
	splx(sps);
}

int
kbdgetcn()
{
	u_char	code;
	int	s = spltty();
	int	ints_active;

	ints_active = 0;
	if (MFP->mf_imrb & IB_AINT) {
		ints_active   = 1;
		MFP->mf_imrb &= ~IB_AINT;
	}
	for (;;) {
		while (!((KBD->ac_cs & (A_IRQ|A_RXRDY)) == (A_IRQ|A_RXRDY)))
			;	/* Wait for key	*/
		if (KBD->ac_cs & (A_OE|A_PE)) {
			code = KBD->ac_da;	/* Silently ignore errors */
			continue;
		}
		break;
	}

	code = KBD->ac_da;
	if (ints_active) {
		MFP->mf_iprb &= ~IB_AINT;
		MFP->mf_imrb |=  IB_AINT;
	}

	splx (s);
	return code;
}

/*
 * Write a command to the keyboard in 'polled' mode.
 */
static int
kbd_write_poll(cmd, len)
u_char	*cmd;
int	len;
{
	int	timeout;

	while (len-- > 0) {
		KBD->ac_da = *cmd++;
		for (timeout = 100; !(KBD->ac_cs & A_TXRDY); timeout--)
			delay(10);
		if (!(KBD->ac_cs & A_TXRDY))
			return (0);
	}
	return (1);
}

/*
 * Write a command to the keyboard. Return when command is send.
 */
void
kbd_write(cmd, len)
u_char	*cmd;
int	len;
{
	struct kbd_softc	*k = &kbd_softc;
	int			sps;

	/*
	 * Get to splhigh, 'real' interrupts arrive at spl6!
	 */
	sps = splhigh();

	/*
	 * Make sure any privious write has ended...
	 */
	while (k->k_sendp != NULL)
		tsleep((caddr_t)&k->k_sendp, TTOPRI, "kbd_write1", 0);

	/*
	 * If the KBD-acia is not currently busy, send the first
	 * character now.
	 */
	KBD->ac_cs = (k->k_soft_cs |= A_TXINT);
	if (KBD->ac_cs & A_TXRDY) {
		KBD->ac_da = *cmd++;
		len--;
	}

	/*
	 * If we're not yet done, wait until all characters are send.
	 */
	if (len > 0) {
		k->k_sendp    = cmd;
		k->k_send_cnt = len;
		tsleep((caddr_t)&k->k_send_cnt, TTOPRI, "kbd_write2", 0);
	}
	splx(sps);

	/*
	 * Wakeup all procs waiting for us.
	 */
	wakeup((caddr_t)&k->k_sendp);
}

/*
 * Setup softc-fields to assemble a keyboard package.
 */
static void
kbd_pkg_start(kp, msg_start)
struct kbd_softc *kp;
u_char		 msg_start;
{
	kp->k_pkg_idx    = 1;
	kp->k_package[0] = msg_start;
	switch (msg_start) {
		case 0xf6:
			kp->k_pkg_size = 8;
			break;
		case 0xf7:
			kp->k_pkg_size = 6;
			break;
		case 0xf8:
		case 0xf9:
		case 0xfa:
		case 0xfb:
			kp->k_pkg_size = 3;
			break;
		case 0xfc:
			kp->k_pkg_size = 7;
			break;
		case 0xfe:
		case 0xff:
			kp->k_pkg_size = 2;
			break;
		default:
			printf("kbd: Unknown packet 0x%x\n", msg_start);
			break;
	}
}