/* $NetBSD: fb.c,v 1.18 2024/12/21 17:40:11 tsutsui Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratory. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)fb.c 8.1 (Berkeley) 6/11/93 */ /* * /dev/fb (indirect frame buffer driver). */ #include __KERNEL_RCSID(0, "$NetBSD: fb.c,v 1.18 2024/12/21 17:40:11 tsutsui Exp $"); #include #include #include #include #include #include #include #include #include #include static dev_type_open(fbopen); static dev_type_close(fbclose); static dev_type_ioctl(fbioctl); static dev_type_mmap(fbmmap); const struct cdevsw fb_cdevsw = { .d_open = fbopen, .d_close = fbclose, .d_read = noread, .d_write = nowrite, .d_ioctl = fbioctl, .d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = fbmmap, .d_kqfilter = nokqfilter, .d_discard = nodiscard, .d_flag = 0 }; static struct fbdevice *devfb; static int fbpriority; /* * This is called by the real driver (i.e. bw2, cg3, ...) * to declare itself as a potential default frame buffer. */ void fb_attach(struct fbdevice *fb, int newpri) { if (fbpriority < newpri) { fbpriority = newpri; devfb = fb; } } static int fbopen(dev_t dev, int flags, int mode, struct lwp *l) { if (devfb == NULL) return (ENXIO); return ((*devfb->fb_driver->fbd_open)(dev, flags, mode, l)); } static int fbclose(dev_t dev, int flags, int mode, struct lwp *l) { return ((*devfb->fb_driver->fbd_close)(dev, flags, mode, l)); } static int fbioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l) { return (fbioctlfb(devfb, cmd, data)); } static paddr_t fbmmap(dev_t dev, off_t off, int prot) { return ((*devfb->fb_driver->fbd_mmap)(dev, off, prot)); } /* * Common fb ioctl function */ int fbioctlfb(struct fbdevice *fb, u_long cmd, void *data) { struct fbdriver *fbd = fb->fb_driver; void *vp = (void *)data; int error; switch (cmd) { case FBIOGTYPE: *(struct fbtype *)vp = fb->fb_fbtype; error = 0; break; case FBIOGATTR: error = (*fbd->fbd_gattr)(fb, vp); break; case FBIOGVIDEO: error = (*fbd->fbd_gvideo)(fb, vp); break; case FBIOSVIDEO: error = (*fbd->fbd_svideo)(fb, vp); break; case FBIOGETCMAP: error = (*fbd->fbd_getcmap)(fb, vp); break; case FBIOPUTCMAP: error = (*fbd->fbd_putcmap)(fb, vp); break; default: error = ENOTTY; } return (error); } void fb_unblank(void) { int on = 1; if (devfb == NULL) return; (*devfb->fb_driver->fbd_svideo)(devfb, (void *)&on); } /* * Default ioctl function to put in struct fbdriver * for functions that are not supported. */ int fb_noioctl(struct fbdevice *fbd, void *vp) { return ENOTTY; } /**************************************************************** * Misc. helpers... */ /* Set FB size based on EEPROM screen shape code. */ void fb_eeprom_setsize(struct fbdevice *fb) { int szcode; int w, h; /* Go get the EEPROM screen size byte. */ szcode = eeprom_copy->eeScreenSize; w = h = 0; switch (szcode) { case EE_SCR_1152X900: w = 1152; h = 900; break; case EE_SCR_1024X1024: w = 1024; h = 1024; break; case EE_SCR_1600X1280: w = 1600; h = 1280; break; case EE_SCR_1440X1440: w = 1440; h = 1440; break; default: break; } if (w && h) { fb->fb_fbtype.fb_width = w; fb->fb_fbtype.fb_height = h; } else { printf("%s: EE size code %d unknown\n", fb->fb_name, szcode); } } /* * Probe for a P4 register at the passed virtual address. * Returns P4 ID value, or -1 if no P4 register. */ int fb_pfour_id(void *va) { volatile uint32_t val, save, *pfour = va; /* Read the P4 register. */ save = *pfour; /* * Try to modify the type code. If it changes, put the * original value back, and tell the caller that the * framebuffer does not have a P4 register. */ val = save & ~P4_REG_RESET; *pfour = (val ^ P4_FBTYPE_MASK); if ((*pfour ^ val) & P4_FBTYPE_MASK) { *pfour = save; return (-1); } return (P4_ID(val)); } /* * Return the status of the video enable. */ int fb_pfour_get_video(struct fbdevice *fb) { return ((*fb->fb_pfour & P4_REG_VIDEO) != 0); } /* * Turn video on or off using the P4 register. */ void fb_pfour_set_video(struct fbdevice *fb, int on) { int pfour; pfour = *fb->fb_pfour & ~(P4_REG_INTCLR|P4_REG_VIDEO); *fb->fb_pfour = pfour | (on ? P4_REG_VIDEO : 0); } static const struct { int w, h; } fb_p4sizedecode[P4_SIZE_MASK+1] = { { 1600, 1280 }, { 1152, 900 }, { 1024, 1024 }, { 1280, 1024 }, { 1440, 1440 }, { 640, 480 }, }; /* * Use the P4 register to determine the screen size. */ void fb_pfour_setsize(struct fbdevice *fb) { int p4, p4type, p4size; int h, w; if (fb->fb_pfour == 0) return; p4 = *fb->fb_pfour; p4type = P4_FBTYPE(p4); /* These do not encode the screen size. */ if (p4type == P4_ID_COLOR24) return; if ((p4type & P4_ID_MASK) == P4_ID_FASTCOLOR) return; p4size = p4type & P4_SIZE_MASK; w = fb_p4sizedecode[p4size].w; h = fb_p4sizedecode[p4size].h; if (w && h) { fb->fb_fbtype.fb_width = w; fb->fb_fbtype.fb_height = h; } else { printf("%s: P4 size code %d unknown\n", fb->fb_name, p4size); } }