NetBSD-5.0.2/sys/dev/sun/ms_zs.c
/* $NetBSD: ms_zs.c,v 1.18 2008/04/20 15:44:01 tsutsui Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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, Lawrence Berkeley Laboratory.
*
* 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. 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.
*
* @(#)ms.c 8.1 (Berkeley) 6/11/93
*/
/*
* Mouse driver (/dev/mouse)
*/
/*
* Zilog Z8530 Dual UART driver (mouse interface)
*
* This is the "slave" driver that will be attached to
* the "zsc" driver for a Sun mouse.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ms_zs.c,v 1.18 2008/04/20 15:44:01 tsutsui Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/time.h>
#include <sys/select.h>
#include <sys/syslog.h>
#include <machine/vuid_event.h>
#include <dev/ic/z8530reg.h>
#include <machine/z8530var.h>
#include <dev/sun/event_var.h>
#include <dev/sun/msvar.h>
static void ms_zs_rxint(struct zs_chanstate *);
static void ms_zs_stint(struct zs_chanstate *, int);
static void ms_zs_txint(struct zs_chanstate *);
static void ms_zs_softint(struct zs_chanstate *);
struct zsops zsops_ms = {
ms_zs_rxint, /* receive char available */
ms_zs_stint, /* external/status */
ms_zs_txint, /* xmit buffer empty */
ms_zs_softint, /* process software interrupt */
};
/* Fall-back baud rate */
#ifdef SUN_MS_BPS
int ms_zs_bps = SUN_MS_BPS;
#else
int ms_zs_bps = MS_DEFAULT_BPS;
#endif
static int ms_zs_match(device_t, cfdata_t, void *);
static void ms_zs_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(ms_zs, sizeof(struct ms_softc),
ms_zs_match, ms_zs_attach, NULL, NULL);
/*
* ms_match: how is this zs channel configured?
*/
int
ms_zs_match(device_t parent, cfdata_t cf, void *aux)
{
struct zsc_attach_args *args = aux;
if (ms_zs_bps == 0)
return 0;
/* Exact match required for keyboard. */
if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
return 2;
return 0;
}
void
ms_zs_attach(device_t parent, device_t self, void *aux)
{
struct zsc_softc *zsc = device_private(parent);
struct ms_softc *ms = device_private(self);
struct zsc_attach_args *args = aux;
struct zs_chanstate *cs;
struct cfdata *cf;
int channel, ms_unit;
int reset, s;
int bps;
ms->ms_dev = self;
cf = device_cfdata(self);
ms_unit = device_unit(self);
channel = args->channel;
cs = zsc->zsc_cs[channel];
cs->cs_private = ms;
cs->cs_ops = &zsops_ms;
ms->ms_cs = cs;
/* Allow kernel option SUN_MS_BPS to hard-code baud rate */
#ifndef SUN_MS_BPS
if ((bps = cs->cs_defspeed) == 0)
#endif
bps = ms_zs_bps;
aprint_normal(": baud rate %d\n", bps);
/* Initialize the speed, etc. */
s = splzs();
/* May need reset... */
reset = (channel == 0) ?
ZSWR9_A_RESET : ZSWR9_B_RESET;
zs_write_reg(cs, 9, reset);
/* These are OK as set by zscc: WR3, WR4, WR5 */
/* We don't care about status or tx interrupts. */
cs->cs_preg[1] = ZSWR1_RIE;
(void)zs_set_speed(cs, bps);
zs_loadchannelregs(cs);
splx(s);
/* Initialize translator. */
ms->ms_byteno = -1;
}
/****************************************************************
* Interface to the lower layer (zscc)
****************************************************************/
static void
ms_zs_rxint(struct zs_chanstate *cs)
{
struct ms_softc *ms;
int put, put_next;
uint8_t c, rr1;
ms = cs->cs_private;
put = ms->ms_rbput;
/*
* First read the status, because reading the received char
* destroys the status of this char.
*/
rr1 = zs_read_reg(cs, 1);
c = zs_read_data(cs);
if (rr1 & (ZSRR1_FE | ZSRR1_DO | ZSRR1_PE)) {
/* Clear the receive error. */
zs_write_csr(cs, ZSWR0_RESET_ERRORS);
}
ms->ms_rbuf[put] = (c << 8) | rr1;
put_next = (put + 1) & MS_RX_RING_MASK;
/* Would overrun if increment makes (put==get). */
if (put_next == ms->ms_rbget) {
ms->ms_intr_flags |= INTR_RX_OVERRUN;
} else {
/* OK, really increment. */
put = put_next;
}
/* Done reading. */
ms->ms_rbput = put;
/* Ask for softint() call. */
cs->cs_softreq = 1;
}
static void
ms_zs_txint(struct zs_chanstate *cs)
{
struct ms_softc *ms;
ms = cs->cs_private;
zs_write_csr(cs, ZSWR0_RESET_TXINT);
ms->ms_intr_flags |= INTR_TX_EMPTY;
/* Ask for softint() call. */
cs->cs_softreq = 1;
}
static void
ms_zs_stint(struct zs_chanstate *cs, int force)
{
struct ms_softc *ms;
uint8_t rr0;
ms = cs->cs_private;
rr0 = zs_read_csr(cs);
zs_write_csr(cs, ZSWR0_RESET_STATUS);
/*
* We have to accumulate status line changes here.
* Otherwise, if we get multiple status interrupts
* before the softint runs, we could fail to notice
* some status line changes in the softint routine.
* Fix from Bill Studenmund, October 1996.
*/
cs->cs_rr0_delta |= (cs->cs_rr0 ^ rr0);
cs->cs_rr0 = rr0;
ms->ms_intr_flags |= INTR_ST_CHECK;
/* Ask for softint() call. */
cs->cs_softreq = 1;
}
static void
ms_zs_softint(struct zs_chanstate *cs)
{
struct ms_softc *ms;
int get, c, s;
int intr_flags;
uint16_t ring_data;
ms = cs->cs_private;
/* Atomically get and clear flags. */
s = splzs();
intr_flags = ms->ms_intr_flags;
ms->ms_intr_flags = 0;
/* Now lower to spltty for the rest. */
(void)spltty();
/*
* Copy data from the receive ring to the event layer.
*/
get = ms->ms_rbget;
while (get != ms->ms_rbput) {
ring_data = ms->ms_rbuf[get];
get = (get + 1) & MS_RX_RING_MASK;
/* low byte of ring_data is rr1 */
c = (ring_data >> 8) & 0xff;
if (ring_data & ZSRR1_DO)
intr_flags |= INTR_RX_OVERRUN;
if (ring_data & (ZSRR1_FE | ZSRR1_PE)) {
log(LOG_ERR, "%s: input error (0x%x)\n",
device_xname(ms->ms_dev), ring_data);
c = -1; /* signal input error */
}
/* Pass this up to the "middle" layer. */
ms_input(ms, c);
}
if (intr_flags & INTR_RX_OVERRUN) {
log(LOG_ERR, "%s: input overrun\n",
device_xname(ms->ms_dev));
}
ms->ms_rbget = get;
if (intr_flags & INTR_TX_EMPTY) {
/*
* Transmit done. (Not expected.)
*/
log(LOG_ERR, "%s: transmit interrupt?\n",
device_xname(ms->ms_dev));
}
if (intr_flags & INTR_ST_CHECK) {
/*
* Status line change. (Not expected.)
*/
log(LOG_ERR, "%s: status interrupt?\n",
device_xname(ms->ms_dev));
cs->cs_rr0_delta = 0;
}
splx(s);
}