xref: /openbsd-src/sys/arch/hppa/gsc/lpt_gsc.c (revision 78d5ff0ec949396ff3bbc97f51b741a17179ba18)
1 /*	$OpenBSD: lpt_gsc.c,v 1.13 2022/03/13 08:04:38 mpi Exp $	*/
2 
3 /*
4  * Copyright (c) 1998 Michael Shalayeff
5  * Copyright (c) 1993, 1994 Charles Hannum.
6  * Copyright (c) 1990 William F. Jolitz, TeleMuse
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. All advertising materials mentioning features or use of this software
18  *    must display the following acknowledgement:
19  *	This software is a component of "386BSD" developed by
20  *	William F. Jolitz, TeleMuse.
21  * 4. Neither the name of the developer nor the name "386BSD"
22  *    may be used to endorse or promote products derived from this software
23  *    without specific prior written permission.
24  *
25  * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
26  * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
27  * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
28  * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
29  * NOT MAKE USE OF THIS WORK.
30  *
31  * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
32  * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
33  * REFERENCES SUCH AS THE  "PORTING UNIX TO THE 386" SERIES
34  * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
35  * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
36  * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
37  * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
38  * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
39  *
40  * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE DEVELOPER BE LIABLE
44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50  * SUCH DAMAGE.
51  */
52 
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/device.h>
56 
57 #include <machine/bus.h>
58 #include <machine/intr.h>
59 #include <machine/iomod.h>
60 #include <machine/autoconf.h>
61 
62 #include <dev/ic/lptreg.h>
63 #include <dev/ic/lptvar.h>
64 
65 #include <hppa/dev/cpudevs.h>
66 
67 #include <hppa/gsc/gscbusvar.h>
68 
69 #define	LPTGSC_OFFSET	0x800
70 
71 int	lpt_gsc_probe(struct device *, void *, void *);
72 void	lpt_gsc_attach(struct device *, struct device *, void *);
73 
74 const struct cfattach lpt_gsc_ca = {
75 	sizeof(struct lpt_softc), lpt_gsc_probe, lpt_gsc_attach
76 };
77 
78 /*
79  * Logic:
80  *	1) You should be able to write to and read back the same value
81  *	   to the data port.  Do an alternating zeros, alternating ones,
82  *	   walking zero, and walking one test to check for stuck bits.
83  *
84  *	2) You should be able to write to and read back the same value
85  *	   to the control port lower 5 bits, the upper 3 bits are reserved
86  *	   per the IBM PC technical reference manuals and different boards
87  *	   do different things with them.  Do an alternating zeros, alternating
88  *	   ones, walking zero, and walking one test to check for stuck bits.
89  *
90  *	   Some printers drag the strobe line down when the are powered off
91  * 	   so this bit has been masked out of the control port test.
92  *
93  *	   XXX Some printers may not like a fast pulse on init or strobe, I
94  *	   don't know at this point, if that becomes a problem these bits
95  *	   should be turned off in the mask byte for the control port test.
96  *
97  *	3) Set the data and control ports to a value of 0
98  */
99 int
lpt_gsc_probe(parent,match,aux)100 lpt_gsc_probe(parent, match, aux)
101 	struct device *parent;
102 	void *match, *aux;
103 {
104 	struct gsc_attach_args *ga = aux;
105 	bus_space_handle_t ioh;
106 	bus_addr_t base;
107 	u_int8_t mask, data;
108 	int i, rv;
109 
110 	if (ga->ga_type.iodc_type != HPPA_TYPE_FIO ||
111 	    ga->ga_type.iodc_sv_model != HPPA_FIO_CENT)
112 		return 0;
113 
114 #ifdef DEBUG
115 #define	ABORT								\
116 	do {								\
117 		printf("lpt_gsc_probe: mask %x data %x failed\n", mask,	\
118 		    data);						\
119 		return 0;						\
120 	} while (0)
121 #else
122 #define	ABORT	do {							\
123 			bus_space_unmap(ga->ga_iot, ioh, LPT_NPORTS);	\
124 			return 0;					\
125 		} while (0)
126 #endif
127 
128 	base = ga->ga_hpa + LPTGSC_OFFSET;
129 	if (bus_space_map(ga->ga_iot, base, LPT_NPORTS, 0, &ioh)) {
130 		printf("lpt_gsc_probe: cannot map io space\n");
131 		return 0;
132 	}
133 
134 	rv = 0;
135 	mask = 0xff;
136 
137 	data = 0x55;				/* Alternating zeros */
138 	if (!lpt_port_test(ga->ga_iot, ioh, base, lpt_data, data, mask))
139 		ABORT;
140 
141 	data = 0xaa;				/* Alternating ones */
142 	if (!lpt_port_test(ga->ga_iot, ioh, base, lpt_data, data, mask))
143 		ABORT;
144 
145 	for (i = 0; i < CHAR_BIT; i++) {	/* Walking zero */
146 		data = ~(1 << i);
147 		if (!lpt_port_test(ga->ga_iot, ioh, base, lpt_data, data, mask))
148 			ABORT;
149 	}
150 
151 	for (i = 0; i < CHAR_BIT; i++) {	/* Walking one */
152 		data = (1 << i);
153 		if (!lpt_port_test(ga->ga_iot, ioh, base, lpt_data, data, mask))
154 			ABORT;
155 	}
156 
157 	bus_space_write_1(ga->ga_iot, ioh, lpt_data, 0);
158 	bus_space_write_1(ga->ga_iot, ioh, lpt_control, 0);
159 	bus_space_unmap(ga->ga_iot, ioh, LPT_NPORTS);
160 
161 	return 1;
162 }
163 
164 void
lpt_gsc_attach(parent,self,aux)165 lpt_gsc_attach(parent, self, aux)
166 	struct device *parent, *self;
167 	void *aux;
168 {
169 	struct lpt_softc *sc = (void *)self;
170 	struct gsc_attach_args *ga = aux;
171 	bus_addr_t base;
172 
173 	/* sc->sc_flags |= LPT_POLLED; */
174 
175 	sc->sc_state = 0;
176 	sc->sc_iot = ga->ga_iot;
177 	base = ga->ga_hpa + LPTGSC_OFFSET;
178 	if (bus_space_map(ga->ga_iot, base, LPT_NPORTS, 0, &sc->sc_ioh)) {
179 		printf(": cannot map io space\n");
180 		return;
181 	}
182 
183 	lpt_attach_common(sc);
184 
185 	sc->sc_ih = gsc_intr_establish((struct gsc_softc *)parent,
186 	    ga->ga_irq, IPL_TTY, lptintr, sc, sc->sc_dev.dv_xname);
187 }
188