1 /*        $NetBSD: bwtwo_sbus.c,v 1.30 2022/09/25 18:03:04 thorpej Exp $ */
2 
3 /*-
4  * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by 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  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 /*
33  * Copyright (c) 1992, 1993
34  *        The Regents of the University of California.  All rights reserved.
35  *
36  * This software was developed by the Computer Systems Engineering group
37  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
38  * contributed to Berkeley.
39  *
40  * All advertising materials mentioning features or use of this software
41  * must display the following acknowledgement:
42  *        This product includes software developed by the University of
43  *        California, Lawrence Berkeley Laboratory.
44  *
45  * Redistribution and use in source and binary forms, with or without
46  * modification, are permitted provided that the following conditions
47  * are met:
48  * 1. Redistributions of source code must retain the above copyright
49  *    notice, this list of conditions and the following disclaimer.
50  * 2. Redistributions in binary form must reproduce the above copyright
51  *    notice, this list of conditions and the following disclaimer in the
52  *    documentation and/or other materials provided with the distribution.
53  * 3. Neither the name of the University nor the names of its contributors
54  *    may be used to endorse or promote products derived from this software
55  *    without specific prior written permission.
56  *
57  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
58  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
59  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
60  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
61  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
62  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
63  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
64  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
65  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
66  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
67  * SUCH DAMAGE.
68  *
69  *        @(#)bwtwo.c         8.1 (Berkeley) 6/11/93
70  */
71 
72 /*
73  * black&white display (bwtwo) driver.
74  *
75  * Does not handle interrupts, even though they can occur.
76  *
77  * P4 and overlay plane support by Jason R. Thorpe <thorpej@NetBSD.org>.
78  * Overlay plane handling hints and ideas provided by Brad Spencer.
79  */
80 
81 #include <sys/cdefs.h>
82 __KERNEL_RCSID(0, "$NetBSD: bwtwo_sbus.c,v 1.30 2022/09/25 18:03:04 thorpej Exp $");
83 
84 #include <sys/param.h>
85 #include <sys/systm.h>
86 #include <sys/device.h>
87 #include <sys/ioctl.h>
88 #include <sys/mman.h>
89 #include <sys/tty.h>
90 #include <sys/conf.h>
91 
92 #include <machine/autoconf.h>
93 #include <machine/eeprom.h>
94 
95 #include <dev/sbus/sbusvar.h>
96 
97 #include <dev/sun/fbio.h>
98 #include <dev/sun/fbvar.h>
99 #include <dev/sun/btreg.h>
100 #include <dev/sun/bwtworeg.h>
101 #include <dev/sun/bwtwovar.h>
102 #include <dev/sun/pfourreg.h>
103 
104 /* autoconfiguration driver */
105 static void         bwtwoattach_sbus (device_t, device_t, void *);
106 static int          bwtwomatch_sbus (device_t, cfdata_t, void *);
107 
108 CFATTACH_DECL_NEW(bwtwo_sbus, sizeof(struct bwtwo_softc),
109     bwtwomatch_sbus, bwtwoattach_sbus, NULL, NULL);
110 
111 static int          bwtwo_get_video (struct bwtwo_softc *);
112 static void         bwtwo_set_video (struct bwtwo_softc *, int);
113 
114 /*
115  * Match a bwtwo.
116  */
117 static int
bwtwomatch_sbus(device_t parent,cfdata_t cf,void * aux)118 bwtwomatch_sbus(device_t parent, cfdata_t cf, void *aux)
119 {
120           struct sbus_attach_args *sa = aux;
121 
122           if (strcmp(cf->cf_name, sa->sa_name) == 0)
123                     return 100;         /* beat genfb(4) */
124 
125           return 0;
126 }
127 
128 
129 /*
130  * Attach a display.  We need to notice if it is the console, too.
131  */
132 void
bwtwoattach_sbus(device_t parent,device_t self,void * args)133 bwtwoattach_sbus(device_t parent, device_t self, void *args)
134 {
135           struct bwtwo_softc *sc = device_private(self);
136           struct sbus_attach_args *sa = args;
137           struct fbdevice *fb = &sc->sc_fb;
138           bus_space_handle_t bh;
139           int isconsole, node;
140           const char *name;
141 
142           sc->sc_dev = self;
143           node = sa->sa_node;
144 
145           /* Remember cookies for bwtwo_mmap() */
146           sc->sc_bustag = sa->sa_bustag;
147           sc->sc_paddr = sbus_bus_addr(sa->sa_bustag, sa->sa_slot, sa->sa_offset);
148 
149           fb->fb_flags = device_cfdata(self)->cf_flags;
150           fb->fb_type.fb_depth = 1;
151           fb_setsize_obp(fb, fb->fb_type.fb_depth, 1152, 900, node);
152 
153           /*
154            * When the ROM has mapped in a bwtwo display, the address
155            * maps only the video RAM, hence we always map the control
156            * registers ourselves.  We only need the video RAM if we are
157            * going to print characters via rconsole.
158            */
159           if (sbus_bus_map(sa->sa_bustag,
160                                sa->sa_slot,
161                                sa->sa_offset + BWREG_REG,
162                                sizeof(struct fbcontrol),
163                                BUS_SPACE_MAP_LINEAR, &bh) != 0) {
164                     aprint_error_dev(self, "cannot map control registers\n");
165                     return;
166           }
167           sc->sc_reg = (struct fbcontrol *)bus_space_vaddr(sa->sa_bustag, bh);
168           fb->fb_pfour = NULL;
169 
170           sc->sc_pixeloffset = BWREG_MEM;
171 
172           isconsole = fb_is_console(node);
173           name = prom_getpropstring(node, "model");
174 
175           /* Assume `bwtwo at sbus' only happens at sun4c's */
176           sc->sc_get_video = bwtwo_get_video;
177           sc->sc_set_video = bwtwo_set_video;
178 
179           if (sa->sa_npromvaddrs != 0)
180                     sc->sc_fb.fb_pixels = (void *)(u_long)sa->sa_promvaddrs[0];
181           if (isconsole && sc->sc_fb.fb_pixels == NULL) {
182                     int ramsize = fb->fb_type.fb_height * fb->fb_linebytes;
183                     if (sbus_bus_map(sa->sa_bustag, sa->sa_slot,
184                                          sa->sa_offset + sc->sc_pixeloffset,
185                                          ramsize,
186                                          BUS_SPACE_MAP_LINEAR, &bh) != 0) {
187                               aprint_error_dev(self, "cannot map pixels\n");
188                               return;
189                     }
190                     sc->sc_fb.fb_pixels = (char *)bus_space_vaddr(sa->sa_bustag, bh);
191           }
192 
193           bwtwoattach(sc, name, isconsole);
194 }
195 
196 static void
bwtwo_set_video(struct bwtwo_softc * sc,int enable)197 bwtwo_set_video(struct bwtwo_softc *sc, int enable)
198 {
199 
200           if (enable)
201                     /*
202                      * If the we're the console the PROM will have taken care
203                      * of the FBC_TIMING bit and video control parameters. We
204                      * simply turn on FBC_TIMING; in case other video parameters
205                      * are necessary, here is a set read from an ELC:
206                      * [0xbb,0x2b,0x4,0x14,0xae,0x3,0xa8,0x24,0x1,0x5,0xff,0x1]
207                      */
208                     sc->sc_reg->fbc_ctrl |= FBC_VENAB | FBC_TIMING;
209           else
210                     sc->sc_reg->fbc_ctrl &= ~FBC_VENAB;
211 }
212 
213 static int
bwtwo_get_video(struct bwtwo_softc * sc)214 bwtwo_get_video(struct bwtwo_softc *sc)
215 {
216 
217           return ((sc->sc_reg->fbc_ctrl & FBC_VENAB) != 0);
218 }
219