1 /* $NetBSD: fb.c,v 1.18 2024/12/21 17:40:11 tsutsui 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 1.18 2024/12/21 17:40:11 tsutsui 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 static dev_type_open(fbopen); 64 static dev_type_close(fbclose); 65 static dev_type_ioctl(fbioctl); 66 static dev_type_mmap(fbmmap); 67 68 const struct cdevsw fb_cdevsw = { 69 .d_open = fbopen, 70 .d_close = fbclose, 71 .d_read = noread, 72 .d_write = nowrite, 73 .d_ioctl = fbioctl, 74 .d_stop = nostop, 75 .d_tty = notty, 76 .d_poll = nopoll, 77 .d_mmap = fbmmap, 78 .d_kqfilter = nokqfilter, 79 .d_discard = nodiscard, 80 .d_flag = 0 81 }; 82 83 static struct fbdevice *devfb; 84 static int fbpriority; 85 86 /* 87 * This is called by the real driver (i.e. bw2, cg3, ...) 88 * to declare itself as a potential default frame buffer. 89 */ 90 void 91 fb_attach(struct fbdevice *fb, int newpri) 92 { 93 if (fbpriority < newpri) { 94 fbpriority = newpri; 95 devfb = fb; 96 } 97 } 98 99 static int 100 fbopen(dev_t dev, int flags, int mode, struct lwp *l) 101 { 102 103 if (devfb == NULL) 104 return (ENXIO); 105 return ((*devfb->fb_driver->fbd_open)(dev, flags, mode, l)); 106 } 107 108 static int 109 fbclose(dev_t dev, int flags, int mode, struct lwp *l) 110 { 111 112 return ((*devfb->fb_driver->fbd_close)(dev, flags, mode, l)); 113 } 114 115 static int 116 fbioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l) 117 { 118 return (fbioctlfb(devfb, cmd, data)); 119 } 120 121 static paddr_t 122 fbmmap(dev_t dev, off_t off, int prot) 123 { 124 return ((*devfb->fb_driver->fbd_mmap)(dev, off, prot)); 125 } 126 127 /* 128 * Common fb ioctl function 129 */ 130 int 131 fbioctlfb(struct fbdevice *fb, u_long cmd, void *data) 132 { 133 struct fbdriver *fbd = fb->fb_driver; 134 void *vp = (void *)data; 135 int error; 136 137 switch (cmd) { 138 139 case FBIOGTYPE: 140 *(struct fbtype *)vp = fb->fb_fbtype; 141 error = 0; 142 break; 143 144 case FBIOGATTR: 145 error = (*fbd->fbd_gattr)(fb, vp); 146 break; 147 148 case FBIOGVIDEO: 149 error = (*fbd->fbd_gvideo)(fb, vp); 150 break; 151 152 case FBIOSVIDEO: 153 error = (*fbd->fbd_svideo)(fb, vp); 154 break; 155 156 case FBIOGETCMAP: 157 error = (*fbd->fbd_getcmap)(fb, vp); 158 break; 159 160 case FBIOPUTCMAP: 161 error = (*fbd->fbd_putcmap)(fb, vp); 162 break; 163 164 default: 165 error = ENOTTY; 166 } 167 return (error); 168 } 169 170 void 171 fb_unblank(void) 172 { 173 int on = 1; 174 175 if (devfb == NULL) 176 return; 177 178 (*devfb->fb_driver->fbd_svideo)(devfb, (void *)&on); 179 } 180 181 /* 182 * Default ioctl function to put in struct fbdriver 183 * for functions that are not supported. 184 */ 185 int 186 fb_noioctl(struct fbdevice *fbd, void *vp) 187 { 188 return ENOTTY; 189 } 190 191 /**************************************************************** 192 * Misc. helpers... 193 */ 194 195 /* Set FB size based on EEPROM screen shape code. */ 196 void 197 fb_eeprom_setsize(struct fbdevice *fb) 198 { 199 int szcode; 200 int w, h; 201 202 /* Go get the EEPROM screen size byte. */ 203 szcode = eeprom_copy->eeScreenSize; 204 205 w = h = 0; 206 switch (szcode) { 207 case EE_SCR_1152X900: 208 w = 1152; 209 h = 900; 210 break; 211 case EE_SCR_1024X1024: 212 w = 1024; 213 h = 1024; 214 break; 215 case EE_SCR_1600X1280: 216 w = 1600; 217 h = 1280; 218 break; 219 case EE_SCR_1440X1440: 220 w = 1440; 221 h = 1440; 222 break; 223 default: 224 break; 225 } 226 227 if (w && h) { 228 fb->fb_fbtype.fb_width = w; 229 fb->fb_fbtype.fb_height = h; 230 } else { 231 printf("%s: EE size code %d unknown\n", 232 fb->fb_name, szcode); 233 } 234 } 235 236 /* 237 * Probe for a P4 register at the passed virtual address. 238 * Returns P4 ID value, or -1 if no P4 register. 239 */ 240 int 241 fb_pfour_id(void *va) 242 { 243 volatile uint32_t val, save, *pfour = va; 244 245 /* Read the P4 register. */ 246 save = *pfour; 247 248 /* 249 * Try to modify the type code. If it changes, put the 250 * original value back, and tell the caller that the 251 * framebuffer does not have a P4 register. 252 */ 253 val = save & ~P4_REG_RESET; 254 *pfour = (val ^ P4_FBTYPE_MASK); 255 if ((*pfour ^ val) & P4_FBTYPE_MASK) { 256 *pfour = save; 257 return (-1); 258 } 259 260 return (P4_ID(val)); 261 } 262 263 /* 264 * Return the status of the video enable. 265 */ 266 int 267 fb_pfour_get_video(struct fbdevice *fb) 268 { 269 270 return ((*fb->fb_pfour & P4_REG_VIDEO) != 0); 271 } 272 273 /* 274 * Turn video on or off using the P4 register. 275 */ 276 void 277 fb_pfour_set_video(struct fbdevice *fb, int on) 278 { 279 int pfour; 280 281 pfour = *fb->fb_pfour & ~(P4_REG_INTCLR|P4_REG_VIDEO); 282 *fb->fb_pfour = pfour | (on ? P4_REG_VIDEO : 0); 283 } 284 285 static const struct { 286 int w, h; 287 } fb_p4sizedecode[P4_SIZE_MASK+1] = { 288 { 1600, 1280 }, 289 { 1152, 900 }, 290 { 1024, 1024 }, 291 { 1280, 1024 }, 292 { 1440, 1440 }, 293 { 640, 480 }, 294 }; 295 296 /* 297 * Use the P4 register to determine the screen size. 298 */ 299 void 300 fb_pfour_setsize(struct fbdevice *fb) 301 { 302 int p4, p4type, p4size; 303 int h, w; 304 305 if (fb->fb_pfour == 0) 306 return; 307 308 p4 = *fb->fb_pfour; 309 p4type = P4_FBTYPE(p4); 310 311 /* These do not encode the screen size. */ 312 if (p4type == P4_ID_COLOR24) 313 return; 314 if ((p4type & P4_ID_MASK) == P4_ID_FASTCOLOR) 315 return; 316 317 p4size = p4type & P4_SIZE_MASK; 318 w = fb_p4sizedecode[p4size].w; 319 h = fb_p4sizedecode[p4size].h; 320 if (w && h) { 321 fb->fb_fbtype.fb_width = w; 322 fb->fb_fbtype.fb_height = h; 323 } else { 324 printf("%s: P4 size code %d unknown\n", 325 fb->fb_name, p4size); 326 } 327 } 328
Indexes created Sun Sep 21 20:09:37 GMT 2025