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