Annotation of sys/dev/isa/lpt_isa.c, Revision 1.1.1.1
1.1 nbrk 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: }
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