fb.c revision 1.11
1 /* $NetBSD: fb.c,v 1.11 2003/08/07 16:29:55 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * All advertising materials mentioning features or use of this software 12 * must display the following acknowledgement: 13 * This product includes software developed by the University of 14 * California, Lawrence Berkeley Laboratory. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 3. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)fb.c 8.1 (Berkeley) 6/11/93 41 */ 42 43 /* 44 * /dev/fb (indirect frame buffer driver). 45 */ 46 47 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: fb.c,v 1.11 2003/08/07 16:29:55 agc Exp $"); 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/conf.h> 53 #include <sys/device.h> 54 #include <sys/ioctl.h> 55 #include <sys/proc.h> 56 57 #include <machine/eeprom.h> 58 #include <dev/sun/fbio.h> 59 60 #include <sun3/dev/fbvar.h> 61 #include <sun3/dev/p4reg.h> 62 63 dev_type_open(fbopen); 64 dev_type_close(fbclose); 65 dev_type_ioctl(fbioctl); 66 dev_type_mmap(fbmmap); 67 68 const struct cdevsw fb_cdevsw = { 69 fbopen, fbclose, noread, nowrite, fbioctl, 70 nostop, notty, nopoll, fbmmap, nokqfilter, 71 }; 72 73 static struct fbdevice *devfb; 74 static int fbpriority; 75 76 /* 77 * This is called by the real driver (i.e. bw2, cg3, ...) 78 * to declare itself as a potential default frame buffer. 79 */ 80 void 81 fb_attach(fb, newpri) 82 struct fbdevice *fb; 83 int newpri; 84 { 85 if (fbpriority < newpri) { 86 fbpriority = newpri; 87 devfb = fb; 88 } 89 } 90 91 int 92 fbopen(dev, flags, mode, p) 93 dev_t dev; 94 int flags, mode; 95 struct proc *p; 96 { 97 98 if (devfb == NULL) 99 return (ENXIO); 100 return ((*devfb->fb_driver->fbd_open)(dev, flags, mode, p)); 101 } 102 103 int 104 fbclose(dev, flags, mode, p) 105 dev_t dev; 106 int flags, mode; 107 struct proc *p; 108 { 109 110 return ((*devfb->fb_driver->fbd_close)(dev, flags, mode, p)); 111 } 112 113 int 114 fbioctl(dev, cmd, data, flags, p) 115 dev_t dev; 116 u_long cmd; 117 caddr_t data; 118 int flags; 119 struct proc *p; 120 { 121 return (fbioctlfb(devfb, cmd, data)); 122 } 123 124 paddr_t 125 fbmmap(dev, off, prot) 126 dev_t dev; 127 off_t off; 128 int prot; 129 { 130 return ((*devfb->fb_driver->fbd_mmap)(dev, off, prot)); 131 } 132 133 /* 134 * Common fb ioctl function 135 */ 136 int 137 fbioctlfb(fb, cmd, data) 138 struct fbdevice *fb; 139 u_long cmd; 140 caddr_t data; 141 { 142 struct fbdriver *fbd = fb->fb_driver; 143 void *vp = (void *)data; 144 int error; 145 146 switch (cmd) { 147 148 case FBIOGTYPE: 149 *(struct fbtype *)vp = fb->fb_fbtype; 150 error = 0; 151 break; 152 153 case FBIOGATTR: 154 error = (*fbd->fbd_gattr)(fb, vp); 155 break; 156 157 case FBIOGVIDEO: 158 error = (*fbd->fbd_gvideo)(fb, vp); 159 break; 160 161 case FBIOSVIDEO: 162 error = (*fbd->fbd_svideo)(fb, vp); 163 break; 164 165 case FBIOGETCMAP: 166 error = (*fbd->fbd_getcmap)(fb, vp); 167 break; 168 169 case FBIOPUTCMAP: 170 error = (*fbd->fbd_putcmap)(fb, vp); 171 break; 172 173 default: 174 error = ENOTTY; 175 } 176 return (error); 177 } 178 179 void 180 fb_unblank() 181 { 182 int on = 1; 183 184 if (devfb == NULL) 185 return; 186 187 (*devfb->fb_driver->fbd_svideo)(devfb, (void *)&on); 188 } 189 190 /* 191 * Default ioctl function to put in struct fbdriver 192 * for functions that are not supported. 193 */ 194 int 195 fb_noioctl(fbd, vp) 196 struct fbdevice *fbd; 197 void *vp; 198 { 199 return ENOTTY; 200 } 201 202 /**************************************************************** 203 * Misc. helpers... 204 */ 205 206 /* Set FB size based on EEPROM screen shape code. */ 207 void 208 fb_eeprom_setsize(fb) 209 struct fbdevice *fb; 210 { 211 int szcode; 212 int w, h; 213 214 /* Go get the EEPROM screen size byte. */ 215 szcode = eeprom_copy->eeScreenSize; 216 217 w = h = 0; 218 switch (szcode) { 219 case EE_SCR_1152X900: 220 w = 1152; 221 h = 900; 222 break; 223 case EE_SCR_1024X1024: 224 w = 1024; 225 h = 1024; 226 break; 227 case EE_SCR_1600X1280: 228 w = 1600; 229 h = 1280; 230 break; 231 case EE_SCR_1440X1440: 232 w = 1440; 233 h = 1440; 234 break; 235 default: 236 break; 237 } 238 239 if (w && h) { 240 fb->fb_fbtype.fb_width = w; 241 fb->fb_fbtype.fb_height = h; 242 } else { 243 printf("%s: EE size code %d unknown\n", 244 fb->fb_name, szcode); 245 } 246 } 247 248 /* 249 * Probe for a P4 register at the passed virtual address. 250 * Returns P4 ID value, or -1 if no P4 register. 251 */ 252 int 253 fb_pfour_id(va) 254 void *va; 255 { 256 volatile u_int32_t val, save, *pfour = va; 257 258 /* Read the P4 register. */ 259 save = *pfour; 260 261 /* 262 * Try to modify the type code. If it changes, put the 263 * original value back, and tell the caller that the 264 * framebuffer does not have a P4 register. 265 */ 266 val = save & ~P4_REG_RESET; 267 *pfour = (val ^ P4_FBTYPE_MASK); 268 if ((*pfour ^ val) & P4_FBTYPE_MASK) { 269 *pfour = save; 270 return (-1); 271 } 272 273 return (P4_ID(val)); 274 } 275 276 /* 277 * Return the status of the video enable. 278 */ 279 int 280 fb_pfour_get_video(fb) 281 struct fbdevice *fb; 282 { 283 284 return ((*fb->fb_pfour & P4_REG_VIDEO) != 0); 285 } 286 287 /* 288 * Turn video on or off using the P4 register. 289 */ 290 void 291 fb_pfour_set_video(fb, on) 292 struct fbdevice *fb; 293 int on; 294 { 295 int pfour; 296 297 pfour = *fb->fb_pfour & ~(P4_REG_INTCLR|P4_REG_VIDEO); 298 *fb->fb_pfour = pfour | (on ? P4_REG_VIDEO : 0); 299 } 300 301 static const struct { 302 int w, h; 303 } fb_p4sizedecode[P4_SIZE_MASK+1] = { 304 { 1600, 1280 }, 305 { 1152, 900 }, 306 { 1024, 1024 }, 307 { 1280, 1024 }, 308 { 1440, 1440 }, 309 { 640, 480 }, 310 }; 311 312 /* 313 * Use the P4 register to determine the screen size. 314 */ 315 void 316 fb_pfour_setsize(fb) 317 struct fbdevice *fb; 318 { 319 int p4, p4type, p4size; 320 int h, w; 321 322 if (fb->fb_pfour == 0) 323 return; 324 325 p4 = *fb->fb_pfour; 326 p4type = P4_FBTYPE(p4); 327 328 /* These do not encode the screen size. */ 329 if (p4type == P4_ID_COLOR24) 330 return; 331 if ((p4type & P4_ID_MASK) == P4_ID_FASTCOLOR) 332 return; 333 334 p4size = p4type & P4_SIZE_MASK; 335 w = fb_p4sizedecode[p4size].w; 336 h = fb_p4sizedecode[p4size].h; 337 if (w && h) { 338 fb->fb_fbtype.fb_width = w; 339 fb->fb_fbtype.fb_height = h; 340 } else { 341 printf("%s: P4 size code %d unknown\n", 342 fb->fb_name, p4size); 343 } 344 } 345
Indexes created Wed Sep 24 15:09:51 GMT 2025