NetBSD-5.0.2/sys/arch/mvme68k/dev/zs_pcc.c
/* $NetBSD: zs_pcc.c,v 1.21 2008/04/28 20:23:29 martin 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 and Jason R. Thorpe.
*
* 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.
*
* 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.
*
* Modified for NetBSD/mvme68k by Jason R. Thorpe <thorpej@NetBSD.org>
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: zs_pcc.c,v 1.21 2008/04/28 20:23:29 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <dev/cons.h>
#include <dev/ic/z8530reg.h>
#include <machine/z8530var.h>
#include <machine/cpu.h>
#include <machine/bus.h>
#include <mvme68k/dev/mainbus.h>
#include <mvme68k/dev/pccreg.h>
#include <mvme68k/dev/pccvar.h>
#include <mvme68k/dev/zsvar.h>
#include "ioconf.h"
/* Definition of the driver for autoconfig. */
static int zsc_pcc_match(device_t, cfdata_t, void *);
static void zsc_pcc_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(zsc_pcc, sizeof(struct zsc_softc),
zsc_pcc_match, zsc_pcc_attach, NULL, NULL);
cons_decl(zsc_pcc);
/*
* Is the zs chip present?
*/
static int
zsc_pcc_match(device_t parent, cfdata_t cf, void *aux)
{
struct pcc_attach_args *pa = aux;
if (strcmp(pa->pa_name, zsc_cd.cd_name))
return 0;
pa->pa_ipl = cf->pcccf_ipl;
if (pa->pa_ipl == -1)
pa->pa_ipl = ZSHARD_PRI;
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.
*/
static void
zsc_pcc_attach(device_t parent, device_t self, void *aux)
{
struct zsc_softc *zsc = device_private(self);
struct pcc_attach_args *pa = aux;
struct zsdevice zs;
bus_space_handle_t bush;
int zs_level, ir;
static int didintr;
zsc->zsc_dev = self;
/* Map the device's registers */
bus_space_map(pa->pa_bust, pa->pa_offset, 4, 0, &bush);
zs_level = pa->pa_ipl;
/* XXX: This is a gross hack. I need to bus-space zs.c ... */
zs.zs_chan_b.zc_csr = (volatile uint8_t *)bush;
zs.zs_chan_b.zc_data = (volatile uint8_t *)bush + 1;
zs.zs_chan_a.zc_csr = (volatile uint8_t *)bush + 2;
zs.zs_chan_a.zc_data = (volatile uint8_t *)bush + 3;
/*
* Do common parts of SCC configuration.
* Note that the vector is not actually used by the ZS chip on
* MVME-147. We set up the PCC so that it provides the vector.
* This is just here so the real vector is printed at config time.
*/
zs_config(zsc, &zs, PCC_VECBASE + PCCV_ZS, PCLK_147);
evcnt_attach_dynamic(&zsc->zsc_evcnt, EVCNT_TYPE_INTR,
pccintr_evcnt(zs_level), "rs232", device_xname(zsc->zsc_dev));
/*
* 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 == 0) {
didintr = 1;
pccintr_establish(PCCV_ZS, zshard_shared, zs_level, zsc, NULL);
}
/* Sanity check the interrupt levels. */
ir = pcc_reg_read(sys_pcc, PCCREG_SERIAL_INTR_CTRL);
if (((ir & PCC_IMASK) != 0) &&
((ir & PCC_IMASK) != zs_level))
panic("%s: zs configured at different IPLs", __func__);
/*
* Set master interrupt enable. Vector is supplied by the PCC.
*/
pcc_reg_write(sys_pcc, PCCREG_SERIAL_INTR_CTRL,
zs_level | PCC_IENABLE | PCC_ZSEXTERN);
zs_write_reg(zsc->zsc_cs[0], 2, PCC_VECBASE + PCCV_ZS);
zs_write_reg(zsc->zsc_cs[0], 9, zs_init_reg[9]);
}
/****************************************************************
* Console support functions (MVME PCC specific!)
****************************************************************/
/*
* Check for SCC console. The MVME-147 always uses unit 0 chan 0.
*/
void
zsc_pcccnprobe(struct consdev *cp)
{
extern const struct cdevsw zstty_cdevsw;
if (machineid != MVME_147) {
cp->cn_pri = CN_DEAD;
return;
}
/* Initialize required fields. */
cp->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0);
cp->cn_pri = CN_NORMAL;
}
void
zsc_pcccninit(struct consdev *cp)
{
bus_space_handle_t bush;
struct zsdevice zs;
bus_space_map(&_mainbus_space_tag,
intiobase_phys + MAINBUS_PCC_OFFSET + PCC_ZS0_OFF, 4, 0, &bush);
/* XXX: This is a gross hack. I need to bus-space zs.c ... */
zs.zs_chan_b.zc_csr = (volatile uint8_t *)bush;
zs.zs_chan_b.zc_data = (volatile uint8_t *)bush + 1;
zs.zs_chan_a.zc_csr = (volatile uint8_t *)bush + 2;
zs.zs_chan_a.zc_data = (volatile uint8_t *)bush + 3;
/* Do common parts of console init. */
zs_cnconfig(0, 0, &zs, PCLK_147);
}