1 /* $OpenBSD: lpt_isa.c,v 1.12 2002/03/14 01:26:56 millert Exp $ */
2
3 /*
4 * Copyright (c) 1993, 1994 Charles Hannum.
5 * Copyright (c) 1990 William F. Jolitz, TeleMuse
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This software is a component of "386BSD" developed by
19 * William F. Jolitz, TeleMuse.
20 * 4. Neither the name of the developer nor the name "386BSD"
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
25 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
26 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
27 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
28 * NOT MAKE USE OF THIS WORK.
29 *
30 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
31 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
32 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
33 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
34 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
35 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
36 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
37 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
40 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
42 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
43 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
44 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
45 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
47 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
48 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
49 * SUCH DAMAGE.
50 */
51
52 /*
53 * Device Driver for AT parallel printer port
54 */
55
56 #include <sys/param.h>
57 #include <sys/systm.h>
58 #include <sys/device.h>
59
60 #include <machine/bus.h>
61 #include <machine/intr.h>
62
63 #include <dev/isa/isavar.h>
64 #include <dev/ic/lptreg.h>
65 #include <dev/ic/lptvar.h>
66
67 int lpt_isa_probe(struct device *, void *, void *);
68 void lpt_isa_attach(struct device *, struct device *, void *);
69
70 struct cfattach lpt_isa_ca = {
71 sizeof(struct lpt_softc), lpt_isa_probe, lpt_isa_attach
72 };
73
74 /*
75 * Logic:
76 * 1) You should be able to write to and read back the same value
77 * to the data port. Do an alternating zeros, alternating ones,
78 * walking zero, and walking one test to check for stuck bits.
79 *
80 * 2) You should be able to write to and read back the same value
81 * to the control port lower 5 bits, the upper 3 bits are reserved
82 * per the IBM PC technical reference manauls and different boards
83 * do different things with them. Do an alternating zeros, alternating
84 * ones, walking zero, and walking one test to check for stuck bits.
85 *
86 * Some printers drag the strobe line down when the are powered off
87 * so this bit has been masked out of the control port test.
88 *
89 * XXX Some printers may not like a fast pulse on init or strobe, I
90 * don't know at this point, if that becomes a problem these bits
91 * should be turned off in the mask byte for the control port test.
92 *
93 * 3) Set the data and control ports to a value of 0
94 */
95 int
96 lpt_isa_probe(parent, match, aux)
97 struct device *parent;
98 void *match, *aux;
99 {
100 #if !defined(__NO_ISA_INTR_CHECK)
101 struct isa_softc *sc = (struct isa_softc *)parent;
102 #endif
103 struct isa_attach_args *ia = aux;
104 bus_space_tag_t iot;
105 bus_space_handle_t ioh;
106 bus_addr_t base;
107 u_int8_t mask, data;
108 int i, rv, iosz;
109
110 #ifdef DEBUG
111 #define ABORT \
112 do { \
113 printf("lpt_isa_probe: mask %x data %x failed\n", mask, \
114 data); \
115 goto out; \
116 } while (0)
117 #else
118 #define ABORT goto out
119 #endif
120
121 iot = ia->ia_iot;
122 base = ia->ia_iobase;
123 iosz = (ia->ia_iosize == 0x666) ? LPT_NPORTS : ia->ia_iosize;
124 if (bus_space_map(iot, base, iosz, 0, &ioh))
125 return 0;
126
127 rv = 0;
128 mask = 0xff;
129
130 data = 0x55; /* Alternating zeros */
131 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
132 ABORT;
133
134 data = 0xaa; /* Alternating ones */
135 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
136 ABORT;
137
138 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */
139 data = ~(1 << i);
140 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
141 ABORT;
142 }
143
144 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */
145 data = (1 << i);
146 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
147 ABORT;
148 }
149
150 bus_space_write_1(iot, ioh, lpt_data, 0);
151 bus_space_write_1(iot, ioh, lpt_control, 0);
152
153 /*
154 * Check if the specified IRQ is available. If not revert to
155 * polled mode.
156 */
157 #if !defined(__NO_ISA_INTR_CHECK)
158 if (ia->ia_irq != IRQUNK &&
159 !isa_intr_check(sc->sc_ic, ia->ia_irq, IST_EDGE))
160 ia->ia_irq = IRQUNK;
161 #endif
162 ia->ia_msize = 0;
163 ia->ia_iosize = iosz;
164
165 rv = 1;
166
167 out:
168 bus_space_unmap(iot, ioh, iosz);
169 return rv;
170 }
171
172 void
173 lpt_isa_attach(parent, self, aux)
174 struct device *parent, *self;
175 void *aux;
176 {
177 struct lpt_softc *sc = (void *)self;
178 struct isa_attach_args *ia = aux;
179
180 sc->sc_state = 0;
181 sc->sc_iot = ia->ia_iot;
182 if (bus_space_map(sc->sc_iot, ia->ia_iobase, ia->ia_iosize, 0,
183 &sc->sc_ioh))
184 panic("lpt_isa_attach: couldn't map I/O ports");
185
186 if (ia->ia_irq == IRQUNK) {
187 sc->sc_flags |= LPT_POLLED;
188 printf(": polled");
189 }
190
191 lpt_attach_common(sc);
192
193 if (ia->ia_irq != IRQUNK)
194 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
195 IPL_TTY, lptintr, sc, sc->sc_dev.dv_xname);
196 }