405 lines
10 KiB
C
405 lines
10 KiB
C
/* $NetBSD: kbd_zs.c,v 1.5 2000/03/30 12:45:42 augustss Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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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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* 1. 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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* 2. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kbd.c 8.2 (Berkeley) 10/30/93
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*/
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/*
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* Keyboard driver (/dev/kbd -- note that we do not have minor numbers
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* [yet?]). Translates incoming bytes to ASCII or to `firm_events' and
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* passes them up to the appropriate reader.
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*/
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/*
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* Zilog Z8530 Dual UART driver (keyboard interface)
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*
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* This is the 8530 portion of the driver that will be attached to
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* the "zsc" driver for a Sun keyboard.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/signal.h>
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#include <sys/signalvar.h>
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#include <sys/time.h>
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#include <sys/select.h>
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#include <sys/syslog.h>
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#include <dev/ic/z8530reg.h>
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#include <machine/z8530var.h>
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#include <machine/vuid_event.h>
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#include <machine/kbd.h>
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#include <dev/sun/event_var.h>
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#include <dev/sun/kbd_xlate.h>
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#include <dev/sun/kbdvar.h>
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/****************************************************************
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* Interface to the lower layer (zscc)
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****************************************************************/
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static void kbd_zs_rxint __P((struct zs_chanstate *));
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static void kbd_zs_stint __P((struct zs_chanstate *, int));
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static void kbd_zs_txint __P((struct zs_chanstate *));
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static void kbd_zs_softint __P((struct zs_chanstate *));
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struct zsops zsops_kbd = {
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kbd_zs_rxint, /* receive char available */
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kbd_zs_stint, /* external/status */
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kbd_zs_txint, /* xmit buffer empty */
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kbd_zs_softint, /* process software interrupt */
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};
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static int kbd_zs_match(struct device *, struct cfdata *, void *);
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static void kbd_zs_attach(struct device *, struct device *, void *);
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static void kbd_zs_write_data __P((struct kbd_softc *, int));
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struct cfattach kbd_zs_ca = {
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sizeof(struct kbd_softc), kbd_zs_match, kbd_zs_attach
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};
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/*
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* kbd_zs_match: how is this zs channel configured?
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*/
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int
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kbd_zs_match(parent, cf, aux)
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struct device *parent;
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struct cfdata *cf;
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void *aux;
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{
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struct zsc_attach_args *args = aux;
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/* Exact match required for keyboard. */
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if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
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return 2;
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return 0;
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}
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void
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kbd_zs_attach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct zsc_softc *zsc = (void *) parent;
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struct kbd_softc *k = (void *) self;
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struct zsc_attach_args *args = aux;
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struct zs_chanstate *cs;
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struct cfdata *cf;
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int channel, kbd_unit;
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int reset, s;
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cf = k->k_dev.dv_cfdata;
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kbd_unit = k->k_dev.dv_unit;
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channel = args->channel;
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cs = zsc->zsc_cs[channel];
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cs->cs_private = k;
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cs->cs_ops = &zsops_kbd;
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k->k_cs = cs;
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k->k_write_data = kbd_zs_write_data;
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if ((args->hwflags & ZS_HWFLAG_CONSOLE_INPUT) != 0) {
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/*
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* Hookup ourselves as the console input channel
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*/
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struct cons_channel *cc;
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if ((cc = malloc(sizeof *cc, M_DEVBUF, M_NOWAIT)) == NULL)
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return;
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cc->cc_dev = self;
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cc->cc_iopen = kbd_cc_open;
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cc->cc_iclose = kbd_cc_close;
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cc->cc_upstream = NULL;
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cons_attach_input(cc);
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k->k_cc = cc;
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k->k_isconsole = 1;
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printf(" (console input)");
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}
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printf("\n");
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callout_init(&k->k_repeat_ch);
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/* Initialize the speed, etc. */
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s = splzs();
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if (k->k_isconsole == 0) {
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/* Not the console; may need reset. */
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reset = (channel == 0) ?
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ZSWR9_A_RESET : ZSWR9_B_RESET;
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zs_write_reg(cs, 9, reset);
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}
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/* These are OK as set by zscc: WR3, WR4, WR5 */
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/* We don't care about status interrupts. */
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cs->cs_preg[1] = ZSWR1_RIE | ZSWR1_TIE;
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(void) zs_set_speed(cs, KBD_BPS);
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zs_loadchannelregs(cs);
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splx(s);
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/* Do this before any calls to kbd_rint(). */
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kbd_xlate_init(&k->k_state);
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/* XXX - Do this in open? */
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k->k_repeat_start = hz/2;
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k->k_repeat_step = hz/20;
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/* Magic sequence. */
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k->k_magic1 = KBD_L1;
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k->k_magic2 = KBD_A;
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}
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/*
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* used by kbd_start_tx();
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*/
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void
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kbd_zs_write_data(k, c)
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struct kbd_softc *k;
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int c;
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{
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int s;
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/* Need splzs to avoid interruption of the delay. */
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s = splzs();
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zs_write_data(k->k_cs, c);
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splx(s);
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}
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static void
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kbd_zs_rxint(cs)
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struct zs_chanstate *cs;
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{
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struct kbd_softc *k;
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int put, put_next;
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u_char c, rr1;
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k = cs->cs_private;
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put = k->k_rbput;
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/*
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* First read the status, because reading the received char
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* destroys the status of this char.
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*/
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rr1 = zs_read_reg(cs, 1);
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c = zs_read_data(cs);
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if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
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/* Clear the receive error. */
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zs_write_csr(cs, ZSWR0_RESET_ERRORS);
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}
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/*
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* Check NOW for a console abort sequence, so that we can
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* abort even when interrupts are locking up the machine.
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*/
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if (k->k_magic1_down) {
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/* The last keycode was "MAGIC1" down. */
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k->k_magic1_down = 0;
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if (c == k->k_magic2) {
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/* Magic "L1-A" sequence; enter debugger. */
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if (k->k_isconsole) {
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zs_abort(cs);
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/* Debugger done. Fake L1-up to finish it. */
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c = k->k_magic1 | KBD_UP;
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} else {
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printf("kbd: magic sequence, but not console\n");
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}
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}
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}
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if (c == k->k_magic1) {
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k->k_magic1_down = 1;
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}
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k->k_rbuf[put] = (c << 8) | rr1;
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put_next = (put + 1) & KBD_RX_RING_MASK;
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/* Would overrun if increment makes (put==get). */
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if (put_next == k->k_rbget) {
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k->k_intr_flags |= INTR_RX_OVERRUN;
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} else {
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/* OK, really increment. */
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put = put_next;
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}
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/* Done reading. */
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k->k_rbput = put;
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/* Ask for softint() call. */
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cs->cs_softreq = 1;
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}
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static void
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kbd_zs_txint(cs)
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struct zs_chanstate *cs;
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{
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struct kbd_softc *k;
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k = cs->cs_private;
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zs_write_csr(cs, ZSWR0_RESET_TXINT);
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k->k_intr_flags |= INTR_TX_EMPTY;
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/* Ask for softint() call. */
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cs->cs_softreq = 1;
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}
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static void
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kbd_zs_stint(cs, force)
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struct zs_chanstate *cs;
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int force;
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{
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struct kbd_softc *k;
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int rr0;
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k = cs->cs_private;
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rr0 = zs_read_csr(cs);
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zs_write_csr(cs, ZSWR0_RESET_STATUS);
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#if 0
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if (rr0 & ZSRR0_BREAK) {
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/* Keyboard unplugged? */
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zs_abort(cs);
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return (0);
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}
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#endif
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/*
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* We have to accumulate status line changes here.
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* Otherwise, if we get multiple status interrupts
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* before the softint runs, we could fail to notice
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* some status line changes in the softint routine.
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* Fix from Bill Studenmund, October 1996.
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*/
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cs->cs_rr0_delta |= (cs->cs_rr0 ^ rr0);
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cs->cs_rr0 = rr0;
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k->k_intr_flags |= INTR_ST_CHECK;
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/* Ask for softint() call. */
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cs->cs_softreq = 1;
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}
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/*
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* Get input from the recieve ring and pass it on.
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* Note: this is called at splsoftclock()
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*/
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static void
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kbd_zs_softint(cs)
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struct zs_chanstate *cs;
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{
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struct kbd_softc *k;
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int get, c, s;
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int intr_flags;
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u_short ring_data;
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k = cs->cs_private;
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/* Atomically get and clear flags. */
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s = splzs();
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intr_flags = k->k_intr_flags;
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k->k_intr_flags = 0;
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/* Now lower to spltty for the rest. */
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(void) spltty();
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/*
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* Copy data from the receive ring to the event layer.
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*/
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get = k->k_rbget;
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while (get != k->k_rbput) {
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ring_data = k->k_rbuf[get];
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get = (get + 1) & KBD_RX_RING_MASK;
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/* low byte of ring_data is rr1 */
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c = (ring_data >> 8) & 0xff;
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if (ring_data & ZSRR1_DO)
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intr_flags |= INTR_RX_OVERRUN;
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if (ring_data & (ZSRR1_FE | ZSRR1_PE)) {
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/*
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* After garbage, flush pending input, and
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* send a reset to resync key translation.
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*/
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log(LOG_ERR, "%s: input error (0x%x)\n",
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k->k_dev.dv_xname, ring_data);
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get = k->k_rbput; /* flush */
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goto send_reset;
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}
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/* Pass this up to the "middle" layer. */
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kbd_input_raw(k, c);
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}
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if (intr_flags & INTR_RX_OVERRUN) {
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log(LOG_ERR, "%s: input overrun\n",
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k->k_dev.dv_xname);
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send_reset:
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/* Send a reset to resync translation. */
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kbd_output(k, KBD_CMD_RESET);
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kbd_start_tx(k);
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}
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k->k_rbget = get;
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if (intr_flags & INTR_TX_EMPTY) {
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/*
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* Transmit done. Try to send more, or
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* clear busy and wakeup drain waiters.
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*/
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k->k_txflags &= ~K_TXBUSY;
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kbd_start_tx(k);
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}
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if (intr_flags & INTR_ST_CHECK) {
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/*
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* Status line change. (Not expected.)
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*/
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log(LOG_ERR, "%s: status interrupt?\n",
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k->k_dev.dv_xname);
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cs->cs_rr0_delta = 0;
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}
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splx(s);
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}
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