fb.c revision 1.7
1 /* $NetBSD: fb.c,v 1.7 2001/09/19 18:10:34 thorpej 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. All advertising materials mentioning features or use of this software 25 * must display the following acknowledgement: 26 * This product includes software developed by the University of 27 * California, Berkeley and its contributors. 28 * 4. Neither the name of the University nor the names of its contributors 29 * may be used to endorse or promote products derived from this software 30 * without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 * 44 * @(#)fb.c 8.1 (Berkeley) 6/11/93 45 */ 46 47 /* 48 * /dev/fb (indirect frame buffer driver). 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/conf.h> 54 #include <sys/device.h> 55 #include <sys/ioctl.h> 56 #include <sys/proc.h> 57 58 #include <machine/eeprom.h> 59 #include <dev/sun/fbio.h> 60 61 #include <sun3/dev/fbvar.h> 62 #include <sun3/dev/p4reg.h> 63 64 cdev_decl(fb); 65 66 static struct fbdevice *devfb; 67 static int fbpriority; 68 69 /* 70 * This is called by the real driver (i.e. bw2, cg3, ...) 71 * to declare itself as a potential default frame buffer. 72 */ 73 void 74 fb_attach(fb, newpri) 75 struct fbdevice *fb; 76 int newpri; 77 { 78 if (fbpriority < newpri) { 79 fbpriority = newpri; 80 devfb = fb; 81 } 82 } 83 84 int 85 fbopen(dev, flags, mode, p) 86 dev_t dev; 87 int flags, mode; 88 struct proc *p; 89 { 90 91 if (devfb == NULL) 92 return (ENXIO); 93 return ((*devfb->fb_driver->fbd_open)(dev, flags, mode, p)); 94 } 95 96 int 97 fbclose(dev, flags, mode, p) 98 dev_t dev; 99 int flags, mode; 100 struct proc *p; 101 { 102 103 return ((*devfb->fb_driver->fbd_close)(dev, flags, mode, p)); 104 } 105 106 int 107 fbioctl(dev, cmd, data, flags, p) 108 dev_t dev; 109 u_long cmd; 110 caddr_t data; 111 int flags; 112 struct proc *p; 113 { 114 return (fbioctlfb(devfb, cmd, data)); 115 } 116 117 paddr_t 118 fbmmap(dev, off, prot) 119 dev_t dev; 120 off_t off; 121 int prot; 122 { 123 return ((*devfb->fb_driver->fbd_mmap)(dev, off, prot)); 124 } 125 126 /* 127 * Common fb ioctl function 128 */ 129 int 130 fbioctlfb(fb, cmd, data) 131 struct fbdevice *fb; 132 u_long cmd; 133 caddr_t data; 134 { 135 struct fbdriver *fbd = fb->fb_driver; 136 void *vp = (void *)data; 137 int error; 138 139 switch (cmd) { 140 141 case FBIOGTYPE: 142 *(struct fbtype *)vp = fb->fb_fbtype; 143 error = 0; 144 break; 145 146 case FBIOGATTR: 147 error = (*fbd->fbd_gattr)(fb, vp); 148 break; 149 150 case FBIOGVIDEO: 151 error = (*fbd->fbd_gvideo)(fb, vp); 152 break; 153 154 case FBIOSVIDEO: 155 error = (*fbd->fbd_svideo)(fb, vp); 156 break; 157 158 case FBIOGETCMAP: 159 error = (*fbd->fbd_getcmap)(fb, vp); 160 break; 161 162 case FBIOPUTCMAP: 163 error = (*fbd->fbd_putcmap)(fb, vp); 164 break; 165 166 default: 167 error = ENOTTY; 168 } 169 return (error); 170 } 171 172 void 173 fb_unblank() 174 { 175 int on = 1; 176 177 if (devfb == NULL) 178 return; 179 180 (*devfb->fb_driver->fbd_svideo)(devfb, (void *)&on); 181 } 182 183 /* 184 * Default ioctl function to put in struct fbdriver 185 * for functions that are not supported. 186 */ 187 int 188 fb_noioctl(fbd, vp) 189 struct fbdevice *fbd; 190 void *vp; 191 { 192 return ENOTTY; 193 } 194 195 /**************************************************************** 196 * Misc. helpers... 197 */ 198 199 /* Set FB size based on EEPROM screen shape code. */ 200 void 201 fb_eeprom_setsize(fb) 202 struct fbdevice *fb; 203 { 204 int szcode; 205 int w, h; 206 207 /* Go get the EEPROM screen size byte. */ 208 szcode = eeprom_copy->eeScreenSize; 209 210 w = h = 0; 211 switch (szcode) { 212 case EE_SCR_1152X900: 213 w = 1152; 214 h = 900; 215 break; 216 case EE_SCR_1024X1024: 217 w = 1024; 218 h = 1024; 219 break; 220 case EE_SCR_1600X1280: 221 w = 1600; 222 h = 1280; 223 break; 224 case EE_SCR_1440X1440: 225 w = 1440; 226 h = 1440; 227 break; 228 default: 229 break; 230 } 231 232 if (w && h) { 233 fb->fb_fbtype.fb_width = w; 234 fb->fb_fbtype.fb_height = h; 235 } else { 236 printf("%s: EE size code %d unknown\n", 237 fb->fb_name, szcode); 238 } 239 } 240 241 /* 242 * Probe for a P4 register at the passed virtual address. 243 * Returns P4 ID value, or -1 if no P4 register. 244 */ 245 int 246 fb_pfour_id(va) 247 void *va; 248 { 249 volatile u_int32_t val, save, *pfour = va; 250 251 /* Read the P4 register. */ 252 save = *pfour; 253 254 /* 255 * Try to modify the type code. If it changes, put the 256 * original value back, and tell the caller that the 257 * framebuffer does not have a P4 register. 258 */ 259 val = save & ~P4_REG_RESET; 260 *pfour = (val ^ P4_FBTYPE_MASK); 261 if ((*pfour ^ val) & P4_FBTYPE_MASK) { 262 *pfour = save; 263 return (-1); 264 } 265 266 return (P4_ID(val)); 267 } 268 269 /* 270 * Return the status of the video enable. 271 */ 272 int 273 fb_pfour_get_video(fb) 274 struct fbdevice *fb; 275 { 276 277 return ((*fb->fb_pfour & P4_REG_VIDEO) != 0); 278 } 279 280 /* 281 * Turn video on or off using the P4 register. 282 */ 283 void 284 fb_pfour_set_video(fb, on) 285 struct fbdevice *fb; 286 int on; 287 { 288 int pfour; 289 290 pfour = *fb->fb_pfour & ~(P4_REG_INTCLR|P4_REG_VIDEO); 291 *fb->fb_pfour = pfour | (on ? P4_REG_VIDEO : 0); 292 } 293 294 static const struct { 295 int w, h; 296 } fb_p4sizedecode[P4_SIZE_MASK+1] = { 297 { 1600, 1280 }, 298 { 1152, 900 }, 299 { 1024, 1024 }, 300 { 1280, 1024 }, 301 { 1440, 1440 }, 302 { 640, 480 }, 303 }; 304 305 /* 306 * Use the P4 register to determine the screen size. 307 */ 308 void 309 fb_pfour_setsize(fb) 310 struct fbdevice *fb; 311 { 312 int p4, p4type, p4size; 313 int h, w; 314 315 if (fb->fb_pfour == 0) 316 return; 317 318 p4 = *fb->fb_pfour; 319 p4type = P4_FBTYPE(p4); 320 321 /* These do not encode the screen size. */ 322 if (p4type == P4_ID_COLOR24) 323 return; 324 if ((p4type & P4_ID_MASK) == P4_ID_FASTCOLOR) 325 return; 326 327 p4size = p4type & P4_SIZE_MASK; 328 w = fb_p4sizedecode[p4size].w; 329 h = fb_p4sizedecode[p4size].h; 330 if (w && h) { 331 fb->fb_fbtype.fb_width = w; 332 fb->fb_fbtype.fb_height = h; 333 } else { 334 printf("%s: P4 size code %d unknown\n", 335 fb->fb_name, p4size); 336 } 337 } 338
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