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pfour_subr.c revision 1.5.74.1 
      1 /*	$NetBSD: pfour_subr.c,v 1.5.74.1 2008/05/16 02:25:06 yamt Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Support routines for pfour framebuffers.
     34  */
     35 
     36 
     37 #include <sys/cdefs.h>
     38 __KERNEL_RCSID(0, "$NetBSD: pfour_subr.c,v 1.5.74.1 2008/05/16 02:25:06 yamt Exp $");
     39 
     40 #include <sys/param.h>
     41 #include <sys/systm.h>
     42 #include <sys/device.h>
     43 
     44 #include <dev/sun/pfourreg.h>
     45 #include <dev/sun/fbio.h>
     46 #include <dev/sun/fbvar.h>
     47 
     48 void
     49 fb_setsize_pfour(fb)
     50 	struct fbdevice *fb;
     51 {
     52 #if defined(SUN4)
     53 	volatile u_int32_t pfour;
     54 	int width, height;
     55 
     56 	/*
     57 	 * Some pfour framebuffers, e.g. the
     58 	 * cgsix, don't encode resolution the
     59 	 * same, so the driver handles that.
     60 	 * The driver can let us know that it
     61 	 * needs to do this by not mapping in
     62 	 * the pfour register by the time this
     63 	 * routine is called.
     64 	 */
     65 	if (fb->fb_pfour == NULL)
     66 		return;
     67 
     68 	pfour = *fb->fb_pfour;
     69 
     70 	/*
     71 	 * Use the pfour register to determine
     72 	 * the size.  Note that the cgsix and
     73 	 * cgeight don't use this size encoding.
     74 	 * In this case, we have to settle
     75 	 * for the defaults we were provided
     76 	 * with.
     77 	 */
     78 	if ((PFOUR_ID(pfour) == PFOUR_ID_COLOR24) ||
     79 	    (PFOUR_ID(pfour) == PFOUR_ID_FASTCOLOR))
     80 		return;
     81 
     82 	switch (PFOUR_SIZE(pfour)) {
     83 	case PFOUR_SIZE_1152X900:
     84 		width = 1152;
     85 		height = 900;
     86 		break;
     87 
     88 	case PFOUR_SIZE_1024X1024:
     89 		width = 1024;
     90 		height = 1024;
     91 		break;
     92 
     93 	case PFOUR_SIZE_1280X1024:
     94 		width = 1280;
     95 		height = 1024;
     96 		break;
     97 
     98 	case PFOUR_SIZE_1600X1280:
     99 		width = 1600;
    100 		height = 1280;
    101 		break;
    102 
    103 	case PFOUR_SIZE_1440X1440:
    104 		width = 1440;
    105 		height = 1440;
    106 		break;
    107 
    108 	case PFOUR_SIZE_640X480:
    109 		width = 640;
    110 		height = 480;
    111 		break;
    112 
    113 	default:
    114 
    115 		/*
    116 		 * Use the defaults already filled in by the generic fb code.
    117 		 */
    118 
    119 		return;
    120 	}
    121 
    122 	fb->fb_type.fb_width = width;
    123 	fb->fb_type.fb_height = height;
    124 #endif /* SUN4 */
    125 }
    126 
    127 
    128 /*
    129  * Probe for a pfour framebuffer.  Return values:
    130  *
    131  *	PFOUR_NOTPFOUR: framebuffer is not a pfour framebuffer
    132  *	otherwise returns pfour ID
    133  */
    134 int
    135 fb_pfour_id(va)
    136 	volatile void *va;
    137 {
    138 #if defined(SUN4)
    139 	volatile u_int32_t val, save, *pfour = va;
    140 
    141 	/* Read the pfour register. */
    142 	save = *pfour;
    143 
    144 	/*
    145 	 * Try to modify the type code.  If it changes, put the
    146 	 * original value back, and notify the caller that it's
    147 	 * not a pfour framebuffer.
    148 	 */
    149 	val = save & ~PFOUR_REG_RESET;
    150 	*pfour = (val ^ PFOUR_FBTYPE_MASK);
    151 	if ((*pfour ^ val) & PFOUR_FBTYPE_MASK) {
    152 		*pfour = save;
    153 		return (PFOUR_NOTPFOUR);
    154 	}
    155 
    156 	return (PFOUR_ID(val));
    157 #else
    158 	return (PFOUR_NOTPFOUR);
    159 #endif /* SUN4 */
    160 }
    161 
    162 /*
    163  * Return the status of the video enable.
    164  */
    165 int
    166 fb_pfour_get_video(fb)
    167 	struct fbdevice *fb;
    168 {
    169 
    170 	return ((*fb->fb_pfour & PFOUR_REG_VIDEO) != 0);
    171 }
    172 
    173 /*
    174  * Enable or disable the framebuffer.
    175  */
    176 void
    177 fb_pfour_set_video(fb, enable)
    178 	struct fbdevice *fb;
    179 	int enable;
    180 {
    181 	volatile u_int32_t pfour;
    182 
    183 	pfour = *fb->fb_pfour & ~(PFOUR_REG_INTCLR|PFOUR_REG_VIDEO);
    184 	*fb->fb_pfour = pfour | (enable ? PFOUR_REG_VIDEO : 0);
    185 }
    186