FreeBSD/Linux Kernel Cross Reference
sys/dev/sun/pfour_subr.c

     /*      $NetBSD: pfour_subr.c,v 1.4 2003/10/28 16:25:29 chs Exp $ */
     
     /*-
      * Copyright (c) 2000 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Paul Kranenburg.
      *
     * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *        This product includes software developed by the NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    /*
     * Support routines for pfour framebuffers.
     */
    
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: pfour_subr.c,v 1.4 2003/10/28 16:25:29 chs Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/device.h>
    
    #include <dev/sun/pfourreg.h>
    #include <dev/sun/fbio.h>
    #include <dev/sun/fbvar.h>
    
    void
    fb_setsize_pfour(fb)
            struct fbdevice *fb;
    {
    #if defined(SUN4)
            volatile u_int32_t pfour;
            int width, height;
    
            /*
             * Some pfour framebuffers, e.g. the
             * cgsix, don't encode resolution the
             * same, so the driver handles that.
             * The driver can let us know that it
             * needs to do this by not mapping in
             * the pfour register by the time this
             * routine is called.
             */
            if (fb->fb_pfour == NULL)
                    return;
    
            pfour = *fb->fb_pfour;
    
            /*
             * Use the pfour register to determine
             * the size.  Note that the cgsix and
             * cgeight don't use this size encoding.
             * In this case, we have to settle
             * for the defaults we were provided
             * with.
             */
            if ((PFOUR_ID(pfour) == PFOUR_ID_COLOR24) ||
                (PFOUR_ID(pfour) == PFOUR_ID_FASTCOLOR))
                    return;
    
            switch (PFOUR_SIZE(pfour)) {
            case PFOUR_SIZE_1152X900:
                    width = 1152;
                    height = 900;
                    break;
    
            case PFOUR_SIZE_1024X1024:
                    width = 1024;
                    height = 1024;
                    break;
    
           case PFOUR_SIZE_1280X1024:
                   width = 1280;
                   height = 1024;
                   break;
   
           case PFOUR_SIZE_1600X1280:
                   width = 1600;
                   height = 1280;
                   break;
   
           case PFOUR_SIZE_1440X1440:
                   width = 1440;
                   height = 1440;
                   break;
   
           case PFOUR_SIZE_640X480:
                   width = 640;
                   height = 480;
                   break;
   
           default:
   
                   /*
                    * Use the defaults already filled in by the generic fb code.
                    */
   
                   return;
           }
   
           fb->fb_type.fb_width = width;
           fb->fb_type.fb_height = height;
   #endif /* SUN4 */
   }
   
   
   /*
    * Probe for a pfour framebuffer.  Return values:
    *
    *      PFOUR_NOTPFOUR: framebuffer is not a pfour framebuffer
    *      otherwise returns pfour ID
    */
   int
   fb_pfour_id(va)
           volatile void *va;
   {
   #if defined(SUN4)
           volatile u_int32_t val, save, *pfour = va;
   
           /* Read the pfour register. */
           save = *pfour;
   
           /*
            * Try to modify the type code.  If it changes, put the
            * original value back, and notify the caller that it's
            * not a pfour framebuffer.
            */
           val = save & ~PFOUR_REG_RESET;
           *pfour = (val ^ PFOUR_FBTYPE_MASK);
           if ((*pfour ^ val) & PFOUR_FBTYPE_MASK) {
                   *pfour = save;
                   return (PFOUR_NOTPFOUR);
           }
   
           return (PFOUR_ID(val));
   #else
           return (PFOUR_NOTPFOUR);
   #endif /* SUN4 */
   }
   
   /*
    * Return the status of the video enable.
    */
   int
   fb_pfour_get_video(fb)
           struct fbdevice *fb;
   {
   
           return ((*fb->fb_pfour & PFOUR_REG_VIDEO) != 0);
   }
   
   /*
    * Enable or disable the framebuffer.
    */
   void
   fb_pfour_set_video(fb, enable)
           struct fbdevice *fb;
           int enable;
   {
           volatile u_int32_t pfour;
   
           pfour = *fb->fb_pfour & ~(PFOUR_REG_INTCLR|PFOUR_REG_VIDEO);
           *fb->fb_pfour = pfour | (enable ? PFOUR_REG_VIDEO : 0);
   }

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