1 /* $NetBSD: fb.c,v 1.5 1998/02/08 05:15:35 gwr 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 <machine/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 int 118 fbmmap(dev, off, prot) 119 dev_t dev; 120 int off, prot; 121 { 122 return ((*devfb->fb_driver->fbd_mmap)(dev, off, prot)); 123 } 124 125 /* 126 * Common fb ioctl function 127 */ 128 int 129 fbioctlfb(fb, cmd, data) 130 struct fbdevice *fb; 131 u_long cmd; 132 caddr_t data; 133 { 134 struct fbdriver *fbd = fb->fb_driver; 135 void *vp = (void *)data; 136 int error; 137 138 switch (cmd) { 139 140 case FBIOGTYPE: 141 *(struct fbtype *)vp = fb->fb_fbtype; 142 error = 0; 143 break; 144 145 case FBIOGATTR: 146 error = (*fbd->fbd_gattr)(fb, vp); 147 break; 148 149 case FBIOGVIDEO: 150 error = (*fbd->fbd_gvideo)(fb, vp); 151 break; 152 153 case FBIOSVIDEO: 154 error = (*fbd->fbd_svideo)(fb, vp); 155 break; 156 157 case FBIOGETCMAP: 158 error = (*fbd->fbd_getcmap)(fb, vp); 159 break; 160 161 case FBIOPUTCMAP: 162 error = (*fbd->fbd_putcmap)(fb, vp); 163 break; 164 165 default: 166 error = ENOTTY; 167 } 168 return (error); 169 } 170 171 void 172 fb_unblank() 173 { 174 int on = 1; 175 176 if (devfb == NULL) 177 return; 178 179 (*devfb->fb_driver->fbd_svideo)(devfb, (void *)&on); 180 } 181 182 /* 183 * Default ioctl function to put in struct fbdriver 184 * for functions that are not supported. 185 */ 186 int 187 fb_noioctl(fbd, vp) 188 struct fbdevice *fbd; 189 void *vp; 190 { 191 return ENOTTY; 192 } 193 194 /**************************************************************** 195 * Misc. helpers... 196 */ 197 198 /* Set FB size based on EEPROM screen shape code. */ 199 void 200 fb_eeprom_setsize(fb) 201 struct fbdevice *fb; 202 { 203 int szcode; 204 int w, h; 205 206 /* Go get the EEPROM screen size byte. */ 207 szcode = eeprom_copy->eeScreenSize; 208 209 w = h = 0; 210 switch (szcode) { 211 case EE_SCR_1152X900: 212 w = 1152; 213 h = 900; 214 break; 215 case EE_SCR_1024X1024: 216 w = 1024; 217 h = 1024; 218 break; 219 case EE_SCR_1600X1280: 220 w = 1600; 221 h = 1280; 222 break; 223 case EE_SCR_1440X1440: 224 w = 1440; 225 h = 1440; 226 break; 227 default: 228 break; 229 } 230 231 if (w && h) { 232 fb->fb_fbtype.fb_width = w; 233 fb->fb_fbtype.fb_height = h; 234 } else { 235 printf("%s: EE size code %d unknown\n", 236 fb->fb_name, szcode); 237 } 238 } 239 240 /* 241 * Probe for a P4 register at the passed virtual address. 242 * Returns P4 ID value, or -1 if no P4 register. 243 */ 244 int 245 fb_pfour_id(va) 246 void *va; 247 { 248 volatile u_int32_t val, save, *pfour = va; 249 250 /* Read the P4 register. */ 251 save = *pfour; 252 253 /* 254 * Try to modify the type code. If it changes, put the 255 * original value back, and tell the caller that the 256 * framebuffer does not have a P4 register. 257 */ 258 val = save & ~P4_REG_RESET; 259 *pfour = (val ^ P4_FBTYPE_MASK); 260 if ((*pfour ^ val) & P4_FBTYPE_MASK) { 261 *pfour = save; 262 return (-1); 263 } 264 265 return (P4_ID(val)); 266 } 267 268 /* 269 * Return the status of the video enable. 270 */ 271 int 272 fb_pfour_get_video(fb) 273 struct fbdevice *fb; 274 { 275 276 return ((*fb->fb_pfour & P4_REG_VIDEO) != 0); 277 } 278 279 /* 280 * Turn video on or off using the P4 register. 281 */ 282 void 283 fb_pfour_set_video(fb, on) 284 struct fbdevice *fb; 285 int on; 286 { 287 int pfour; 288 289 pfour = *fb->fb_pfour & ~(P4_REG_INTCLR|P4_REG_VIDEO); 290 *fb->fb_pfour = pfour | (on ? P4_REG_VIDEO : 0); 291 } 292 293 static const struct { 294 int w, h; 295 } fb_p4sizedecode[P4_SIZE_MASK+1] = { 296 { 1600, 1280 }, 297 { 1152, 900 }, 298 { 1024, 1024 }, 299 { 1280, 1024 }, 300 { 1440, 1440 }, 301 { 640, 480 }, 302 }; 303 304 /* 305 * Use the P4 register to determine the screen size. 306 */ 307 void 308 fb_pfour_setsize(fb) 309 struct fbdevice *fb; 310 { 311 int p4, p4type, p4size; 312 int h, w; 313 314 if (fb->fb_pfour == 0) 315 return; 316 317 p4 = *fb->fb_pfour; 318 p4type = P4_FBTYPE(p4); 319 320 /* These do not encode the screen size. */ 321 if (p4type == P4_ID_COLOR24) 322 return; 323 if ((p4type & P4_ID_MASK) == P4_ID_FASTCOLOR) 324 return; 325 326 p4size = p4type & P4_SIZE_MASK; 327 w = fb_p4sizedecode[p4size].w; 328 h = fb_p4sizedecode[p4size].h; 329 if (w && h) { 330 fb->fb_fbtype.fb_width = w; 331 fb->fb_fbtype.fb_height = h; 332 } else { 333 printf("%s: P4 size code %d unknown\n", 334 fb->fb_name, p4size); 335 } 336 } 337