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/* $OpenBSD: zsclock.c,v 1.4 2014/11/18 20:51:01 krw Exp $ */
/* $NetBSD: clock.c,v 1.11 1995/05/16 07:30:46 phil Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz and Don Ahn.
*
* 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.
*
* @(#)clock.c 7.2 (Berkeley) 5/12/91
*
*/
/*
* Primitive clock interrupt routines.
*
* Improved by Phil Budne ... 10/17/94.
* Pulled over code from i386/isa/clock.c (Matthias Pfaller 12/03/94).
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <dev/ic/z8530reg.h>
#include <machine/z8530var.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>
/*
* Zilog Z8530 Dual UART driver (clock interface)
*/
/* Clock state. */
struct zsclock_softc {
struct device zsc_dev;
struct zs_chanstate *zsc_cs;
};
int zsclock_match(struct device *, void *, void *);
void zsclock_attach(struct device *, struct device *, void *);
struct cfattach zsclock_ca = {
sizeof(struct zsclock_softc), zsclock_match, zsclock_attach
};
struct cfdriver zsclock_cd = {
NULL, "zsclock", DV_DULL
};
void zsclock_stint(struct zs_chanstate *, int);
struct zsops zsops_clock = {
NULL,
zsclock_stint,
NULL,
NULL
};
static int zsclock_attached;
/*
* clock_match: how is this zs channel configured?
*/
int
zsclock_match(struct device *parent, void *match, void *aux)
{
struct cfdata *cf = match;
struct zsc_attach_args *args = aux;
/* only attach one instance */
if (zsclock_attached)
return (0);
/* make sure we'll win a probe over zstty or zskbd */
if (cf->cf_loc[ZSCCF_CHANNEL] == args->channel)
return (2 + 2);
if (cf->cf_loc[ZSCCF_CHANNEL] == ZSCCF_CHANNEL_DEFAULT)
return (2 + 1);
return (0);
}
/*
* The Solbourne IDT systems provide a 4.9152 MHz clock to the ZS chips.
*/
#define PCLK (9600 * 512) /* PCLK pin input clock rate */
void
zsclock_attach(struct device *parent, struct device *self, void *aux)
{
struct zsc_softc *zsc = (void *)parent;
struct zsclock_softc *sc = (void *)self;
struct zsc_attach_args *args = aux;
struct zs_chanstate *cs;
int channel;
int reset, s, tconst;
channel = args->channel;
cs = &zsc->zsc_cs[channel];
cs->cs_private = zsc;
cs->cs_ops = &zsops_clock;
sc->zsc_cs = cs;
printf("\n");
hz = 100;
tconst = ((PCLK / 2) / hz) - 2;
s = splclock();
reset = (channel == 0) ? ZSWR9_A_RESET : ZSWR9_B_RESET;
zs_write_reg(cs, 9, reset);
cs->cs_preg[1] = 0;
cs->cs_preg[3] = ZSWR3_RX_8 | ZSWR3_RX_ENABLE;
cs->cs_preg[4] = ZSWR4_CLK_X1 | ZSWR4_ONESB | ZSWR4_PARENB;
cs->cs_preg[5] = ZSWR5_TX_8 | ZSWR5_TX_ENABLE;
cs->cs_preg[9] = ZSWR9_MASTER_IE;
cs->cs_preg[10] = 0;
cs->cs_preg[11] = ZSWR11_RXCLK_RTXC | ZSWR11_TXCLK_RTXC |
ZSWR11_TRXC_OUT_ENA | ZSWR11_TRXC_BAUD;
cs->cs_preg[12] = tconst;
cs->cs_preg[13] = tconst >> 8;
cs->cs_preg[14] = ZSWR14_BAUD_FROM_PCLK | ZSWR14_BAUD_ENA;
cs->cs_preg[15] = ZSWR15_ZERO_COUNT_IE;
zs_loadchannelregs(cs);
splx(s);
/* enable interrupts */
cs->cs_preg[1] |= ZSWR1_SIE;
zs_write_reg(cs, 1, cs->cs_preg[1]);
zsclock_attached = 1;
}
void
zsclock_stint(struct zs_chanstate *cs, int force)
{
u_char rr0;
rr0 = zs_read_csr(cs);
cs->cs_rr0 = rr0;
/*
* Retrigger the interrupt as a soft interrupt, because we need
* a trap frame for hardclock().
*/
ienab_bis(IE_L10);
zs_write_csr(cs, ZSWR0_RESET_STATUS);
}
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