NetBSD/sys/arch/newsmips/dev/zs_hb.c

434 lines
10 KiB
C

/* $NetBSD: zs_hb.c,v 1.4 2000/03/06 21:36:10 thorpej Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross.
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Zilog Z8530 Dual UART driver (machine-dependent part)
*
* Runs two serial lines per chip using slave drivers.
* Plain tty/async lines use the zs_async slave.
* Sun keyboard/mouse uses the zs_kbd/zs_ms slaves.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/tty.h>
#include <machine/adrsmap.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/z8530var.h>
#include <dev/cons.h>
#include <dev/ic/z8530reg.h>
#include "zsc.h" /* NZSC */
#define NZS NZSC
/* Make life easier for the initialized arrays here. */
#if NZS < 2
#undef NZS
#define NZS 2
#endif
#define ZSCFLAG_EX 0x01 /* expansion board */
/*
* The news3400 provides a 4.9152 MHz clock to the ZS chips.
*/
#define PCLK (9600 * 512) /* PCLK pin input clock rate */
#define PCLK_EX (9600 * 384)
/*
* Define interrupt levels.
*/
#define ZSHARD_PRI 64
#define ZS_DELAY() {(void)*(volatile char *)INTEN1; delay(2);}
/* The layout of this is hardware-dependent (padding, order). */
struct zschan {
volatile u_char zc_csr; /* ctrl,status, and indirect access */
volatile u_char zc_data; /* data */
};
struct zsdevice {
/* Yes, they are backwards. */
struct zschan zs_chan_b;
struct zschan zs_chan_a;
};
extern int zs_def_cflag;
extern void (*zs_delay) __P((void));
static struct zsdevice *zsaddr[NZS];
/* Flags from cninit() */
static int zs_hwflags[NZS][2];
/* Default speed for all channels */
static int zs_defspeed = 9600;
static u_char zs_init_reg[16] = {
0, /* 0: CMD (reset, etc.) */
0, /* 1: No interrupts yet. */
ZSHARD_PRI, /* IVECT */
ZSWR3_RX_8 | ZSWR3_RX_ENABLE,
ZSWR4_CLK_X16 | ZSWR4_ONESB | ZSWR4_EVENP,
ZSWR5_TX_8 | ZSWR5_TX_ENABLE,
0, /* 6: TXSYNC/SYNCLO */
0, /* 7: RXSYNC/SYNCHI */
0, /* 8: alias for data port */
ZSWR9_MASTER_IE,
0, /*10: Misc. TX/RX control bits */
ZSWR11_TXCLK_BAUD | ZSWR11_RXCLK_BAUD,
((PCLK/32)/9600)-2, /*12: BAUDLO (default=9600) */
0, /*13: BAUDHI (default=9600) */
ZSWR14_BAUD_ENA | ZSWR14_BAUD_FROM_PCLK,
ZSWR15_BREAK_IE,
};
static struct zschan * zs_get_chan_addr __P((int, int));
static void zs_hb_delay __P((void));
static int zshard_hb __P((void *));
static int zs_getc __P((void *));
static void zs_putc __P((void *, int));
int zshard __P((void *));
int zs_get_speed __P((struct zs_chanstate *));
struct zschan *
zs_get_chan_addr(zs_unit, channel)
int zs_unit, channel;
{
struct zsdevice *addr;
struct zschan *zc;
if (zs_unit >= NZS)
return NULL;
addr = zsaddr[zs_unit];
if (addr == NULL)
return NULL;
if (channel == 0) {
zc = &addr->zs_chan_a;
} else {
zc = &addr->zs_chan_b;
}
return (zc);
}
void
zs_hb_delay()
{
ZS_DELAY();
}
/****************************************************************
* Autoconfig
****************************************************************/
/* Definition of the driver for autoconfig. */
int zs_hb_match __P((struct device *, struct cfdata *, void *));
void zs_hb_attach __P((struct device *, struct device *, void *));
int zs_print __P((void *, const char *name));
struct cfattach zsc_hb_ca = {
sizeof(struct zsc_softc), zs_hb_match, zs_hb_attach
};
/*
* Is the zs chip present?
*/
int
zs_hb_match(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux;
{
struct confargs *ca = aux;
if (strcmp(ca->ca_name, "zsc"))
return 0;
/* This returns -1 on a fault (bus error). */
if (badaddr((char *)cf->cf_addr, 1))
return 0;
return 1;
}
/*
* Attach a found zs.
*
* Match slave number to zs unit number, so that misconfiguration will
* not set up the keyboard as ttya, etc.
*/
void
zs_hb_attach(parent, self, aux)
struct device *parent;
struct device *self;
void *aux;
{
struct zsc_softc *zsc = (void *)self;
/* struct confargs *ca = aux; */
struct zsc_attach_args zsc_args;
volatile struct zschan *zc;
struct zs_chanstate *cs;
int s, zs_unit, channel, intlevel;
static int didintr;
zs_unit = zsc->zsc_dev.dv_unit;
intlevel = zsc->zsc_dev.dv_cfdata->cf_level;
zsaddr[zs_unit] = (void *)zsc->zsc_dev.dv_cfdata->cf_addr;
if (intlevel == -1) {
#if 0
printf(": interrupt level not configured\n");
return;
#else
printf(": interrupt level not configured; using");
intlevel = 1;
#endif
}
printf(" level %d\n", intlevel);
zs_delay = zs_hb_delay;
/*
* Initialize software state for each channel.
*/
for (channel = 0; channel < 2; channel++) {
zsc_args.channel = channel;
zsc_args.hwflags = zs_hwflags[zs_unit][channel];
cs = &zsc->zsc_cs_store[channel];
zsc->zsc_cs[channel] = cs;
cs->cs_channel = channel;
cs->cs_private = NULL;
cs->cs_ops = &zsops_null;
if ((zsc->zsc_dev.dv_cfdata->cf_flags & ZSCFLAG_EX) == 0)
cs->cs_brg_clk = PCLK / 16;
else
cs->cs_brg_clk = PCLK_EX / 16;
zc = zs_get_chan_addr(zs_unit, channel);
cs->cs_reg_csr = &zc->zc_csr;
cs->cs_reg_data = &zc->zc_data;
bcopy(zs_init_reg, cs->cs_creg, 16);
bcopy(zs_init_reg, cs->cs_preg, 16);
/* XXX: Get these from the EEPROM instead? */
/* XXX: See the mvme167 code. Better. */
if (zsc_args.hwflags & ZS_HWFLAG_CONSOLE)
cs->cs_defspeed = zs_get_speed(cs);
else
cs->cs_defspeed = zs_defspeed;
cs->cs_defcflag = zs_def_cflag;
/* Make these correspond to cs_defcflag (-crtscts) */
cs->cs_rr0_dcd = ZSRR0_DCD;
cs->cs_rr0_cts = 0;
cs->cs_wr5_dtr = ZSWR5_DTR | ZSWR5_RTS;
cs->cs_wr5_rts = 0;
/*
* Clear the master interrupt enable.
* The INTENA is common to both channels,
* so just do it on the A channel.
*/
if (channel == 0) {
zs_write_reg(cs, 9, 0);
}
/*
* Look for a child driver for this channel.
* The child attach will setup the hardware.
*/
if (!config_found(self, (void *)&zsc_args, zs_print)) {
/* No sub-driver. Just reset it. */
u_char reset = (channel == 0) ?
ZSWR9_A_RESET : ZSWR9_B_RESET;
s = splhigh();
zs_write_reg(cs, 9, reset);
splx(s);
}
}
/*
* Now safe to install interrupt handlers. Note the arguments
* to the interrupt handlers aren't used. Note, we only do this
* once since both SCCs interrupt at the same level and vector.
*/
if (!didintr) {
didintr = 1;
hb_intr_establish(intlevel, IPL_SERIAL, zshard_hb, NULL);
}
/* XXX; evcnt_attach() ? */
/*
* Set the master interrupt enable and interrupt vector.
* (common to both channels, do it on A)
*/
cs = zsc->zsc_cs[0];
s = splhigh();
/* interrupt vector */
zs_write_reg(cs, 2, zs_init_reg[2]);
/* master interrupt control (enable) */
zs_write_reg(cs, 9, zs_init_reg[9]);
splx(s);
}
/*
* Our ZS chips all share a common, autovectored interrupt,
* so we have to look at all of them on each interrupt.
*/
static int
zshard_hb(arg)
void *arg;
{
(void) *(volatile u_char *)SCCVECT;
return zshard(arg);
}
/*
* Polled input char.
*/
int
zs_getc(arg)
void *arg;
{
register volatile struct zschan *zc = arg;
register int s, c, rr0;
s = splhigh();
/* Wait for a character to arrive. */
do {
rr0 = zc->zc_csr;
ZS_DELAY();
} while ((rr0 & ZSRR0_RX_READY) == 0);
c = zc->zc_data;
ZS_DELAY();
splx(s);
/*
* This is used by the kd driver to read scan codes,
* so don't translate '\r' ==> '\n' here...
*/
return (c);
}
/*
* Polled output char.
*/
void
zs_putc(arg, c)
void *arg;
int c;
{
register volatile struct zschan *zc = arg;
register int s, rr0;
s = splhigh();
/* Wait for transmitter to become ready. */
do {
rr0 = zc->zc_csr;
ZS_DELAY();
} while ((rr0 & ZSRR0_TX_READY) == 0);
zc->zc_data = c;
ZS_DELAY();
splx(s);
}
/*****************************************************************/
static void zscnprobe __P((struct consdev *));
static void zscninit __P((struct consdev *));
static int zscngetc __P((dev_t));
static void zscnputc __P((dev_t, int));
static void zscnpollc __P((dev_t, int));
struct consdev consdev_zs = {
zscnprobe,
zscninit,
zscngetc,
zscnputc,
zscnpollc,
NULL,
};
void
zscnprobe(cn)
struct consdev *cn;
{
}
void
zscninit(cn)
struct consdev *cn;
{
cn->cn_dev = makedev(zs_major, 0);
cn->cn_pri = CN_REMOTE;
zs_hwflags[0][0] = ZS_HWFLAG_CONSOLE;
}
int
zscngetc(dev)
dev_t dev;
{
return zs_getc((void *)SCCPORT0A);
}
void
zscnputc(dev, c)
dev_t dev;
int c;
{
zs_putc((void *)SCCPORT0A, c);
}
void
zscnpollc(dev, on)
dev_t dev;
int on;
{
}