1 /* $NetBSD: fb.c,v 1.14 2007/03/04 06:00:53 christos 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 1.14 2007/03/04 06:00:53 christos 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(struct fbdevice *fb, int newpri) 82 { 83 if (fbpriority < newpri) { 84 fbpriority = newpri; 85 devfb = fb; 86 } 87 } 88 89 int 90 fbopen(dev_t dev, int flags, int mode, struct lwp *l) 91 { 92 93 if (devfb == NULL) 94 return (ENXIO); 95 return ((*devfb->fb_driver->fbd_open)(dev, flags, mode, l)); 96 } 97 98 int 99 fbclose(dev_t dev, int flags, int mode, struct lwp *l) 100 { 101 102 return ((*devfb->fb_driver->fbd_close)(dev, flags, mode, l)); 103 } 104 105 int 106 fbioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l) 107 { 108 return (fbioctlfb(devfb, cmd, data)); 109 } 110 111 paddr_t 112 fbmmap(dev_t dev, off_t off, int prot) 113 { 114 return ((*devfb->fb_driver->fbd_mmap)(dev, off, prot)); 115 } 116 117 /* 118 * Common fb ioctl function 119 */ 120 int 121 fbioctlfb(struct fbdevice *fb, u_long cmd, void *data) 122 { 123 struct fbdriver *fbd = fb->fb_driver; 124 void *vp = (void *)data; 125 int error; 126 127 switch (cmd) { 128 129 case FBIOGTYPE: 130 *(struct fbtype *)vp = fb->fb_fbtype; 131 error = 0; 132 break; 133 134 case FBIOGATTR: 135 error = (*fbd->fbd_gattr)(fb, vp); 136 break; 137 138 case FBIOGVIDEO: 139 error = (*fbd->fbd_gvideo)(fb, vp); 140 break; 141 142 case FBIOSVIDEO: 143 error = (*fbd->fbd_svideo)(fb, vp); 144 break; 145 146 case FBIOGETCMAP: 147 error = (*fbd->fbd_getcmap)(fb, vp); 148 break; 149 150 case FBIOPUTCMAP: 151 error = (*fbd->fbd_putcmap)(fb, vp); 152 break; 153 154 default: 155 error = ENOTTY; 156 } 157 return (error); 158 } 159 160 void 161 fb_unblank(void) 162 { 163 int on = 1; 164 165 if (devfb == NULL) 166 return; 167 168 (*devfb->fb_driver->fbd_svideo)(devfb, (void *)&on); 169 } 170 171 /* 172 * Default ioctl function to put in struct fbdriver 173 * for functions that are not supported. 174 */ 175 int 176 fb_noioctl(struct fbdevice *fbd, void *vp) 177 { 178 return ENOTTY; 179 } 180 181 /**************************************************************** 182 * Misc. helpers... 183 */ 184 185 /* Set FB size based on EEPROM screen shape code. */ 186 void 187 fb_eeprom_setsize(struct fbdevice *fb) 188 { 189 int szcode; 190 int w, h; 191 192 /* Go get the EEPROM screen size byte. */ 193 szcode = eeprom_copy->eeScreenSize; 194 195 w = h = 0; 196 switch (szcode) { 197 case EE_SCR_1152X900: 198 w = 1152; 199 h = 900; 200 break; 201 case EE_SCR_1024X1024: 202 w = 1024; 203 h = 1024; 204 break; 205 case EE_SCR_1600X1280: 206 w = 1600; 207 h = 1280; 208 break; 209 case EE_SCR_1440X1440: 210 w = 1440; 211 h = 1440; 212 break; 213 default: 214 break; 215 } 216 217 if (w && h) { 218 fb->fb_fbtype.fb_width = w; 219 fb->fb_fbtype.fb_height = h; 220 } else { 221 printf("%s: EE size code %d unknown\n", 222 fb->fb_name, szcode); 223 } 224 } 225 226 /* 227 * Probe for a P4 register at the passed virtual address. 228 * Returns P4 ID value, or -1 if no P4 register. 229 */ 230 int 231 fb_pfour_id(void *va) 232 { 233 volatile uint32_t val, save, *pfour = va; 234 235 /* Read the P4 register. */ 236 save = *pfour; 237 238 /* 239 * Try to modify the type code. If it changes, put the 240 * original value back, and tell the caller that the 241 * framebuffer does not have a P4 register. 242 */ 243 val = save & ~P4_REG_RESET; 244 *pfour = (val ^ P4_FBTYPE_MASK); 245 if ((*pfour ^ val) & P4_FBTYPE_MASK) { 246 *pfour = save; 247 return (-1); 248 } 249 250 return (P4_ID(val)); 251 } 252 253 /* 254 * Return the status of the video enable. 255 */ 256 int 257 fb_pfour_get_video(struct fbdevice *fb) 258 { 259 260 return ((*fb->fb_pfour & P4_REG_VIDEO) != 0); 261 } 262 263 /* 264 * Turn video on or off using the P4 register. 265 */ 266 void 267 fb_pfour_set_video(struct fbdevice *fb, int on) 268 { 269 int pfour; 270 271 pfour = *fb->fb_pfour & ~(P4_REG_INTCLR|P4_REG_VIDEO); 272 *fb->fb_pfour = pfour | (on ? P4_REG_VIDEO : 0); 273 } 274 275 static const struct { 276 int w, h; 277 } fb_p4sizedecode[P4_SIZE_MASK+1] = { 278 { 1600, 1280 }, 279 { 1152, 900 }, 280 { 1024, 1024 }, 281 { 1280, 1024 }, 282 { 1440, 1440 }, 283 { 640, 480 }, 284 }; 285 286 /* 287 * Use the P4 register to determine the screen size. 288 */ 289 void 290 fb_pfour_setsize(struct fbdevice *fb) 291 { 292 int p4, p4type, p4size; 293 int h, w; 294 295 if (fb->fb_pfour == 0) 296 return; 297 298 p4 = *fb->fb_pfour; 299 p4type = P4_FBTYPE(p4); 300 301 /* These do not encode the screen size. */ 302 if (p4type == P4_ID_COLOR24) 303 return; 304 if ((p4type & P4_ID_MASK) == P4_ID_FASTCOLOR) 305 return; 306 307 p4size = p4type & P4_SIZE_MASK; 308 w = fb_p4sizedecode[p4size].w; 309 h = fb_p4sizedecode[p4size].h; 310 if (w && h) { 311 fb->fb_fbtype.fb_width = w; 312 fb->fb_fbtype.fb_height = h; 313 } else { 314 printf("%s: P4 size code %d unknown\n", 315 fb->fb_name, p4size); 316 } 317 } 318