202 lines
6.0 KiB
C
202 lines
6.0 KiB
C
/* $NetBSD: zs_pcc.c,v 1.21 2008/04/28 20:23:29 martin Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross and Jason R. Thorpe.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Zilog Z8530 Dual UART driver (machine-dependent part)
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*
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* Runs two serial lines per chip using slave drivers.
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* Plain tty/async lines use the zs_async slave.
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*
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* Modified for NetBSD/mvme68k by Jason R. Thorpe <thorpej@NetBSD.org>
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: zs_pcc.c,v 1.21 2008/04/28 20:23:29 martin Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/syslog.h>
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#include <dev/cons.h>
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#include <dev/ic/z8530reg.h>
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#include <machine/z8530var.h>
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#include <machine/cpu.h>
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#include <machine/bus.h>
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#include <mvme68k/dev/mainbus.h>
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#include <mvme68k/dev/pccreg.h>
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#include <mvme68k/dev/pccvar.h>
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#include <mvme68k/dev/zsvar.h>
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#include "ioconf.h"
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/* Definition of the driver for autoconfig. */
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static int zsc_pcc_match(device_t, cfdata_t, void *);
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static void zsc_pcc_attach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(zsc_pcc, sizeof(struct zsc_softc),
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zsc_pcc_match, zsc_pcc_attach, NULL, NULL);
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cons_decl(zsc_pcc);
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/*
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* Is the zs chip present?
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*/
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static int
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zsc_pcc_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct pcc_attach_args *pa = aux;
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if (strcmp(pa->pa_name, zsc_cd.cd_name))
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return 0;
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pa->pa_ipl = cf->pcccf_ipl;
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if (pa->pa_ipl == -1)
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pa->pa_ipl = ZSHARD_PRI;
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return 1;
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}
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/*
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* Attach a found zs.
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*
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* Match slave number to zs unit number, so that misconfiguration will
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* not set up the keyboard as ttya, etc.
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*/
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static void
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zsc_pcc_attach(device_t parent, device_t self, void *aux)
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{
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struct zsc_softc *zsc = device_private(self);
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struct pcc_attach_args *pa = aux;
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struct zsdevice zs;
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bus_space_handle_t bush;
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int zs_level, ir;
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static int didintr;
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zsc->zsc_dev = self;
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/* Map the device's registers */
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bus_space_map(pa->pa_bust, pa->pa_offset, 4, 0, &bush);
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zs_level = pa->pa_ipl;
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/* XXX: This is a gross hack. I need to bus-space zs.c ... */
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zs.zs_chan_b.zc_csr = (volatile uint8_t *)bush;
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zs.zs_chan_b.zc_data = (volatile uint8_t *)bush + 1;
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zs.zs_chan_a.zc_csr = (volatile uint8_t *)bush + 2;
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zs.zs_chan_a.zc_data = (volatile uint8_t *)bush + 3;
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/*
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* Do common parts of SCC configuration.
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* Note that the vector is not actually used by the ZS chip on
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* MVME-147. We set up the PCC so that it provides the vector.
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* This is just here so the real vector is printed at config time.
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*/
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zs_config(zsc, &zs, PCC_VECBASE + PCCV_ZS, PCLK_147);
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evcnt_attach_dynamic(&zsc->zsc_evcnt, EVCNT_TYPE_INTR,
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pccintr_evcnt(zs_level), "rs232", device_xname(zsc->zsc_dev));
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/*
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* Now safe to install interrupt handlers. Note the arguments
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* to the interrupt handlers aren't used. Note, we only do this
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* once since both SCCs interrupt at the same level and vector.
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*/
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if (didintr == 0) {
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didintr = 1;
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pccintr_establish(PCCV_ZS, zshard_shared, zs_level, zsc, NULL);
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}
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/* Sanity check the interrupt levels. */
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ir = pcc_reg_read(sys_pcc, PCCREG_SERIAL_INTR_CTRL);
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if (((ir & PCC_IMASK) != 0) &&
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((ir & PCC_IMASK) != zs_level))
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panic("%s: zs configured at different IPLs", __func__);
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/*
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* Set master interrupt enable. Vector is supplied by the PCC.
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*/
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pcc_reg_write(sys_pcc, PCCREG_SERIAL_INTR_CTRL,
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zs_level | PCC_IENABLE | PCC_ZSEXTERN);
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zs_write_reg(zsc->zsc_cs[0], 2, PCC_VECBASE + PCCV_ZS);
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zs_write_reg(zsc->zsc_cs[0], 9, zs_init_reg[9]);
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}
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/****************************************************************
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* Console support functions (MVME PCC specific!)
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****************************************************************/
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/*
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* Check for SCC console. The MVME-147 always uses unit 0 chan 0.
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*/
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void
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zsc_pcccnprobe(struct consdev *cp)
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{
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extern const struct cdevsw zstty_cdevsw;
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if (machineid != MVME_147) {
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cp->cn_pri = CN_DEAD;
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return;
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}
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/* Initialize required fields. */
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cp->cn_dev = makedev(cdevsw_lookup_major(&zstty_cdevsw), 0);
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cp->cn_pri = CN_NORMAL;
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}
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void
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zsc_pcccninit(struct consdev *cp)
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{
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bus_space_handle_t bush;
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struct zsdevice zs;
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bus_space_map(&_mainbus_space_tag,
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intiobase_phys + MAINBUS_PCC_OFFSET + PCC_ZS0_OFF, 4, 0, &bush);
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/* XXX: This is a gross hack. I need to bus-space zs.c ... */
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zs.zs_chan_b.zc_csr = (volatile uint8_t *)bush;
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zs.zs_chan_b.zc_data = (volatile uint8_t *)bush + 1;
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zs.zs_chan_a.zc_csr = (volatile uint8_t *)bush + 2;
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zs.zs_chan_a.zc_data = (volatile uint8_t *)bush + 3;
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/* Do common parts of console init. */
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zs_cnconfig(0, 0, &zs, PCLK_147);
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}
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