1 /* $NetBSD: vga_ofbus.c,v 1.18 2023/12/20 15:34:45 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
22 * School of Computer Science
23 * Carnegie Mellon University
24 * Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30 #include <sys/cdefs.h>
31 __KERNEL_RCSID(0, "$NetBSD: vga_ofbus.c,v 1.18 2023/12/20 15:34:45 thorpej Exp $");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/device.h>
37 #include <sys/proc.h>
38 #include <sys/kauth.h>
39
40 #include <dev/isa/isavar.h>
41
42 #include <dev/ic/mc6845reg.h>
43 #include <dev/ic/pcdisplayvar.h>
44 #include <dev/ic/vgareg.h>
45 #include <dev/ic/vgavar.h>
46
47 #include <dev/wscons/wsconsio.h>
48 #include <dev/wscons/wsdisplayvar.h>
49
50 #include <dev/ofw/openfirm.h>
51
52 #include <shark/ofw/vga_ofbusvar.h>
53
54 struct vga_ofbus_softc {
55 struct vga_softc sc_vga;
56
57 int sc_phandle;
58 };
59
60 #if (NIGSFB_OFBUS > 0) || (NVGA_OFBUS > 0)
61 extern int console_ihandle;
62 #endif
63
64 int vga_ofbus_match (device_t, cfdata_t, void *);
65 void vga_ofbus_attach (device_t, device_t, void *);
66
67 CFATTACH_DECL_NEW(vga_ofbus, sizeof(struct vga_ofbus_softc),
68 vga_ofbus_match, vga_ofbus_attach, NULL, NULL);
69
70 static const struct device_compatible_entry compat_data[] = {
71 { .compat = "pnpPNP,900" },
72 DEVICE_COMPAT_EOL
73 };
74
75 static int vga_ofbus_ioctl(void *, u_long, void *, int, struct lwp *);
76 static paddr_t vga_ofbus_mmap(void *, off_t, int);
77
78 static const struct vga_funcs vga_ofbus_funcs = {
79 vga_ofbus_ioctl,
80 vga_ofbus_mmap
81 };
82 static uint32_t vga_reg[12];
83 extern paddr_t isa_io_physaddr, isa_mem_physaddr;
84
85 int
vga_ofbus_match(device_t parent,cfdata_t match,void * aux)86 vga_ofbus_match(device_t parent, cfdata_t match, void *aux)
87 {
88 struct ofbus_attach_args *oba = aux;
89
90 if (!of_compatible_match(oba->oba_phandle, compat_data))
91 return (0);
92
93 if (!vga_is_console(&isa_io_bs_tag, WSDISPLAY_TYPE_ISAVGA) &&
94 !vga_common_probe(&isa_io_bs_tag, &isa_mem_bs_tag))
95 return (0);
96
97 return (2); /* more than generic pcdisplay */
98 }
99
100 void
vga_ofbus_attach(device_t parent,device_t self,void * aux)101 vga_ofbus_attach(device_t parent, device_t self, void *aux)
102 {
103 struct vga_ofbus_softc *osc = device_private(self);
104 struct vga_softc *sc = &osc->sc_vga;
105 struct ofbus_attach_args *oba = aux;
106 int vga_handle, i;
107
108 sc->sc_dev = self;
109 aprint_normal("\n");
110 osc->sc_phandle = oba->oba_phandle;
111
112 vga_handle = OF_finddevice("/vlbus/display");
113 OF_getprop(vga_handle, "reg", vga_reg, sizeof(vga_reg));
114
115 /* for some idiotic reason we get this in the wrong byte order */
116 for (i = 0; i < 12; i++) {
117 vga_reg[i] = be32toh(vga_reg[i]);
118 aprint_debug_dev(self, "vga_reg[%2d] = 0x%08x\n",
119 i, vga_reg[i]);
120 }
121
122 vga_common_attach(sc, &isa_io_bs_tag, &isa_mem_bs_tag,
123 WSDISPLAY_TYPE_ISAVGA, 0, &vga_ofbus_funcs);
124 if (vga_reg[10] > 0) {
125 aprint_normal_dev(self, "aperture at 0x%08x\n", vga_reg[10]);
126 }
127 }
128
129 int
vga_ofbus_cnattach(bus_space_tag_t iot,bus_space_tag_t memt)130 vga_ofbus_cnattach(bus_space_tag_t iot, bus_space_tag_t memt)
131 {
132 int chosen_phandle;
133 int stdout_ihandle, stdout_phandle, ret;
134 char buf[128];
135
136 stdout_phandle = 0;
137
138 /*
139 * Find out whether the firmware's chosen stdout is
140 * a display. If so, use the existing ihandle so the firmware
141 * doesn't become Unhappy. If not, just open it.
142 */
143 if ((chosen_phandle = OF_finddevice("/chosen")) == -1 ||
144 OF_getprop(chosen_phandle, "stdout", &stdout_ihandle,
145 sizeof(stdout_ihandle)) != sizeof(stdout_ihandle)) {
146 return ENXIO;
147 }
148 stdout_ihandle = of_decode_int((unsigned char *)&stdout_ihandle);
149 if ((stdout_phandle = OF_instance_to_package(stdout_ihandle)) == -1 ||
150 OF_getprop(stdout_phandle, "device_type", buf, sizeof(buf)) <= 0) {
151 return ENXIO;
152 }
153
154 if (strcmp(buf, "display") != 0) {
155 /* The display is not stdout device. */
156 return ENXIO;
157 }
158
159 if (OF_call_method("text-mode3", stdout_ihandle, 0, 0) != 0) {
160 printf("vga_ofbus_match: text-mode3 method invocation on VGA "
161 "screen device failed\n");
162 }
163
164 ret = vga_cnattach(iot, memt, WSDISPLAY_TYPE_ISAVGA, 1);
165 #if (NIGSFB_OFBUS > 0) || (NVGA_OFBUS > 0)
166 if (ret == 0)
167 console_ihandle = stdout_ihandle;
168 #endif
169
170 return ret;
171 }
172
173 static int
vga_ofbus_ioctl(void * cookie,u_long cmd,void * data,int flag,struct lwp * l)174 vga_ofbus_ioctl(void *cookie, u_long cmd, void *data, int flag, struct lwp *l)
175 {
176 /* we should catch WSDISPLAYIO_SMODE here */
177 return 0;
178 }
179
180 static paddr_t
vga_ofbus_mmap(void * cookie,off_t offset,int prot)181 vga_ofbus_mmap(void *cookie, off_t offset, int prot)
182 {
183
184 /* only the superuser may mmap IO and aperture */
185 if (curlwp != NULL) {
186 if (kauth_authorize_machdep(kauth_cred_get(),
187 KAUTH_MACHDEP_UNMANAGEDMEM, NULL, NULL, NULL, NULL) != 0) {
188 return -1;
189 }
190 }
191
192 /*
193 * XXX
194 * we should really use bus_space_mmap here but for some reason
195 * the ISA tags contain kernel virtual addresses and translating them
196 * back to physical addresses doesn't really work
197 */
198 /* access to IO ports */
199 if ((offset >= PCI_MAGIC_IO_RANGE) &&
200 (offset < (PCI_MAGIC_IO_RANGE + 0x10000))) {
201 paddr_t pa;
202
203 pa = isa_io_physaddr + offset - PCI_MAGIC_IO_RANGE;
204 return arm_btop(pa);
205 }
206
207 /* legacy VGA aperture */
208 if ((offset >= 0xa0000) && (offset < 0xc0000)) {
209
210 return arm_btop(isa_mem_physaddr + offset);
211 }
212
213 /* SVGA aperture, we get the address from OpenFirmware */
214 if (vga_reg[10] == 0)
215 return -1;
216
217 if ((offset >= vga_reg[10]) &&
218 (offset < (vga_reg[10] + vga_reg[11]))) {
219
220 return arm_btop(isa_mem_physaddr + offset);
221 }
222
223 return -1;
224 }
225