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      1 /*	$NetBSD: pfour_subr.c,v 1.7 2009/03/14 15:36:21 dsl 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 1.7 2009/03/14 15:36:21 dsl 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(struct fbdevice *fb)
     50 {
     51 #if defined(SUN4)
     52 	volatile u_int32_t pfour;
     53 	int width, height;
     54 
     55 	/*
     56 	 * Some pfour framebuffers, e.g. the
     57 	 * cgsix, don't encode resolution the
     58 	 * same, so the driver handles that.
     59 	 * The driver can let us know that it
     60 	 * needs to do this by not mapping in
     61 	 * the pfour register by the time this
     62 	 * routine is called.
     63 	 */
     64 	if (fb->fb_pfour == NULL)
     65 		return;
     66 
     67 	pfour = *fb->fb_pfour;
     68 
     69 	/*
     70 	 * Use the pfour register to determine
     71 	 * the size.  Note that the cgsix and
     72 	 * cgeight don't use this size encoding.
     73 	 * In this case, we have to settle
     74 	 * for the defaults we were provided
     75 	 * with.
     76 	 */
     77 	if ((PFOUR_ID(pfour) == PFOUR_ID_COLOR24) ||
     78 	    (PFOUR_ID(pfour) == PFOUR_ID_FASTCOLOR))
     79 		return;
     80 
     81 	switch (PFOUR_SIZE(pfour)) {
     82 	case PFOUR_SIZE_1152X900:
     83 		width = 1152;
     84 		height = 900;
     85 		break;
     86 
     87 	case PFOUR_SIZE_1024X1024:
     88 		width = 1024;
     89 		height = 1024;
     90 		break;
     91 
     92 	case PFOUR_SIZE_1280X1024:
     93 		width = 1280;
     94 		height = 1024;
     95 		break;
     96 
     97 	case PFOUR_SIZE_1600X1280:
     98 		width = 1600;
     99 		height = 1280;
    100 		break;
    101 
    102 	case PFOUR_SIZE_1440X1440:
    103 		width = 1440;
    104 		height = 1440;
    105 		break;
    106 
    107 	case PFOUR_SIZE_640X480:
    108 		width = 640;
    109 		height = 480;
    110 		break;
    111 
    112 	default:
    113 
    114 		/*
    115 		 * Use the defaults already filled in by the generic fb code.
    116 		 */
    117 
    118 		return;
    119 	}
    120 
    121 	fb->fb_type.fb_width = width;
    122 	fb->fb_type.fb_height = height;
    123 #endif /* SUN4 */
    124 }
    125 
    126 
    127 /*
    128  * Probe for a pfour framebuffer.  Return values:
    129  *
    130  *	PFOUR_NOTPFOUR: framebuffer is not a pfour framebuffer
    131  *	otherwise returns pfour ID
    132  */
    133 int
    134 fb_pfour_id(volatile void *va)
    135 {
    136 #if defined(SUN4)
    137 	volatile u_int32_t val, save, *pfour = va;
    138 
    139 	/* Read the pfour register. */
    140 	save = *pfour;
    141 
    142 	/*
    143 	 * Try to modify the type code.  If it changes, put the
    144 	 * original value back, and notify the caller that it's
    145 	 * not a pfour framebuffer.
    146 	 */
    147 	val = save & ~PFOUR_REG_RESET;
    148 	*pfour = (val ^ PFOUR_FBTYPE_MASK);
    149 	if ((*pfour ^ val) & PFOUR_FBTYPE_MASK) {
    150 		*pfour = save;
    151 		return (PFOUR_NOTPFOUR);
    152 	}
    153 
    154 	return (PFOUR_ID(val));
    155 #else
    156 	return (PFOUR_NOTPFOUR);
    157 #endif /* SUN4 */
    158 }
    159 
    160 /*
    161  * Return the status of the video enable.
    162  */
    163 int
    164 fb_pfour_get_video(struct fbdevice *fb)
    165 {
    166 
    167 	return ((*fb->fb_pfour & PFOUR_REG_VIDEO) != 0);
    168 }
    169 
    170 /*
    171  * Enable or disable the framebuffer.
    172  */
    173 void
    174 fb_pfour_set_video(struct fbdevice *fb, int enable)
    175 {
    176 	volatile u_int32_t pfour;
    177 
    178 	pfour = *fb->fb_pfour & ~(PFOUR_REG_INTCLR|PFOUR_REG_VIDEO);
    179 	*fb->fb_pfour = pfour | (enable ? PFOUR_REG_VIDEO : 0);
    180 }
    181