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zs_pcc.c revision 1.7.16.1
      1 /*	$NetBSD: zs_pcc.c,v 1.7.16.1 2000/03/11 20:51:51 scw Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Gordon W. Ross and Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Zilog Z8530 Dual UART driver (machine-dependent part)
     41  *
     42  * Runs two serial lines per chip using slave drivers.
     43  * Plain tty/async lines use the zs_async slave.
     44  *
     45  * Modified for NetBSD/mvme68k by Jason R. Thorpe <thorpej (at) NetBSD.ORG>
     46  */
     47 
     48 #include <sys/param.h>
     49 #include <sys/systm.h>
     50 #include <sys/proc.h>
     51 #include <sys/device.h>
     52 #include <sys/conf.h>
     53 #include <sys/file.h>
     54 #include <sys/ioctl.h>
     55 #include <sys/tty.h>
     56 #include <sys/time.h>
     57 #include <sys/kernel.h>
     58 #include <sys/syslog.h>
     59 
     60 #include <dev/cons.h>
     61 #include <dev/ic/z8530reg.h>
     62 #include <machine/z8530var.h>
     63 
     64 #include <machine/cpu.h>
     65 #include <machine/bus.h>
     66 
     67 #include <mvme68k/dev/pccreg.h>
     68 #include <mvme68k/dev/pccvar.h>
     69 #include <mvme68k/dev/zsvar.h>
     70 
     71 /*
     72  * PCC offsets.
     73  */
     74 static int zs_pcc_offsets[NZSC] = { PCC_ZS0_OFF, PCC_ZS1_OFF };
     75 
     76 struct zschan *
     77 zs_pcc_get_chan_addr(zsc_unit, channel)
     78 	int zsc_unit, channel;
     79 {
     80 	struct zsdevice *addr;
     81 	struct zschan *zc;
     82 
     83 	if (zsc_unit >= NZSC)
     84 		return NULL;
     85 	addr = (struct zsdevice *)PCC_VADDR(zs_pcc_offsets[zsc_unit]);
     86 	if (addr == NULL)
     87 		return NULL;
     88 	if (channel == 0) {
     89 		zc = &addr->zs_chan_a;
     90 	} else {
     91 		zc = &addr->zs_chan_b;
     92 	}
     93 	return (zc);
     94 }
     95 
     96 /****************************************************************
     97  * Autoconfig
     98  ****************************************************************/
     99 
    100 /* Definition of the driver for autoconfig. */
    101 static int	zsc_pcc_match  __P((struct device *, struct cfdata *, void *));
    102 static void	zsc_pcc_attach __P((struct device *, struct device *, void *));
    103 
    104 struct cfattach zsc_pcc_ca = {
    105 	sizeof(struct zsc_softc), zsc_pcc_match, zsc_pcc_attach
    106 };
    107 
    108 extern struct cfdriver zsc_cd;
    109 
    110 /*
    111  * Is the zs chip present?
    112  */
    113 static int
    114 zsc_pcc_match(parent, cf, aux)
    115 	struct device *parent;
    116 	struct cfdata *cf;
    117 	void *aux;
    118 {
    119 	struct pcc_attach_args *pa = aux;
    120 	int unit;
    121 
    122 	/* XXX This is bogus; should fix this. */
    123 	unit = cf->cf_unit;
    124 	if (unit < 0 || unit >= NZSC)
    125 		return (0);
    126 
    127 	if (strcmp(pa->pa_name, zsc_cd.cd_name))
    128 		return (0);
    129 
    130 	pa->pa_ipl = cf->pcccf_ipl;
    131 	if (pa->pa_ipl == -1)
    132 		pa->pa_ipl = ZSHARD_PRI;
    133 	return (1);
    134 }
    135 
    136 /*
    137  * Attach a found zs.
    138  *
    139  * Match slave number to zs unit number, so that misconfiguration will
    140  * not set up the keyboard as ttya, etc.
    141  */
    142 static void
    143 zsc_pcc_attach(parent, self, aux)
    144 	struct device *parent;
    145 	struct device *self;
    146 	void *aux;
    147 {
    148 	struct zsc_softc *zsc = (void *) self;
    149 	struct pcc_attach_args *pa = aux;
    150 	int zs_level, ir;
    151 	static int didintr;
    152 
    153 	zs_level = pa->pa_ipl;
    154 
    155 	/* Do common parts of SCC configuration. */
    156 	zs_config(zsc, zs_pcc_get_chan_addr);
    157 
    158 	/*
    159 	 * Now safe to install interrupt handlers.  Note the arguments
    160 	 * to the interrupt handlers aren't used.  Note, we only do this
    161 	 * once since both SCCs interrupt at the same level and vector.
    162 	 */
    163 	if (didintr == 0) {
    164 		didintr = 1;
    165 		pccintr_establish(PCCV_ZS, zshard, zs_level, zsc);
    166 	}
    167 
    168 	/* Sanity check the interrupt levels. */
    169 	ir = pcc_reg_read(sys_pcc, PCCREG_SERIAL_INTR_CTRL);
    170 	if (((ir & PCC_IMASK) != 0) &&
    171 	    ((ir & PCC_IMASK) != zs_level))
    172 		panic("zs_pcc_attach: zs configured at different IPLs");
    173 
    174 	/*
    175 	 * Set master interrupt enable.  Vector is programmed into
    176 	 * the SCC by the PCC.
    177 	 */
    178 	pcc_reg_write(sys_pcc, PCCREG_SERIAL_INTR_CTRL,
    179 	    zs_level | PCC_IENABLE | PCC_ZSEXTERN);
    180 	zs_write_reg(zsc->zsc_cs[0], 9, zs_init_reg[9]);
    181 }
    182 
    183 /****************************************************************
    184  * Console support functions (MVME PCC specific!)
    185  ****************************************************************/
    186 
    187 /*
    188  * Check for SCC console.  The MVME-147 always uses unit 0 chan 0.
    189  */
    190 void
    191 zsc_pcccnprobe(cp)
    192 	struct consdev *cp;
    193 {
    194 	if (machineid != MVME_147) {
    195 		cp->cn_pri = CN_DEAD;
    196 		return;
    197 	}
    198 
    199 	/* Initialize required fields. */
    200 	cp->cn_dev = makedev(zs_major, 0);
    201 	cp->cn_pri = CN_NORMAL;
    202 }
    203 
    204 void
    205 zsc_pcccninit(cp)
    206 	struct consdev *cp;
    207 {
    208 	int unit, chan;
    209 	struct zschan *zc;
    210 
    211 	unit = 0;	/* XXX */
    212 	chan = 0;	/* XXX */
    213 	zc = zs_pcc_get_chan_addr(unit, chan);
    214 
    215 	/* Do common parts of console init. */
    216 	zs_cnconfig(unit, chan, zc);
    217 }
    218