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      1 /*	$NetBSD: video_subr.c,v 1.13 2012/02/12 16:34:11 matt 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 UCHIYAMA Yasushi.
      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 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: video_subr.c,v 1.13 2012/02/12 16:34:11 matt Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/malloc.h>
     38 
     39 #include <machine/bootinfo.h>
     40 
     41 #include <dev/hpc/video_subr.h>
     42 
     43 #define BPP2 ({								\
     44 	u_int8_t bitmap;						\
     45 	bitmap = *(volatile u_int8_t*)addr;				\
     46 	*(volatile u_int8_t*)addr =					\
     47 		(bitmap & ~(0x3 << ((3 - (x % 4)) * 2)));		\
     48 })
     49 
     50 #define BPP4 ({								\
     51 	u_int8_t bitmap;						\
     52 	bitmap = *(volatile u_int8_t*)addr;				\
     53 	*(volatile u_int8_t*)addr =					\
     54 		(bitmap & ~(0xf << ((1 - (x % 2)) * 4)));		\
     55 })
     56 
     57 #define BPP8 ({								\
     58 	*(volatile u_int8_t*)addr = 0xff;				\
     59 })
     60 
     61 #define BRESENHAM(a, b, c, d, func) ({					\
     62 	u_int32_t fbaddr = vc->vc_fbvaddr;				\
     63 	u_int32_t fbwidth = vc->vc_fbwidth;				\
     64 	u_int32_t fbdepth = vc->vc_fbdepth;				\
     65 	len = a, step = b -1;						\
     66 	if (step == 0)							\
     67 		return;							\
     68 	kstep = len == 0 ? 0 : 1;					\
     69 	for (i = k = 0, j = step / 2; i <= step; i++) {			\
     70 		x = xbase c;						\
     71 		y = ybase d;						\
     72 		addr = fbaddr + (((y * fbwidth + x) * fbdepth) >> 3);	\
     73 		func;							\
     74 		j -= len;						\
     75 		while (j < 0) {						\
     76 			j += step;					\
     77 			k += kstep;					\
     78 		}							\
     79 	}								\
     80 })
     81 
     82 #define DRAWLINE(func) ({						\
     83 	if (x < 0) {							\
     84 		if (y < 0) {						\
     85 			if (_y < _x) {					\
     86 				BRESENHAM(_y, _x, -i, -k, func);	\
     87 			} else {					\
     88 				BRESENHAM(_x, _y, -k, -i, func);	\
     89 			}						\
     90 		} else {						\
     91 			if (_y < _x) {					\
     92 				BRESENHAM(_y, _x, -i, +k, func);	\
     93 			} else {					\
     94 				BRESENHAM(_x, _y, -k, +i, func);	\
     95 			}						\
     96 		}							\
     97 	} else {							\
     98 		if (y < 0) {						\
     99 			if (_y < _x) {					\
    100 				BRESENHAM(_y, _x, +i, -k, func);	\
    101 			} else {					\
    102 				BRESENHAM(_x, _y, +k, -i, func);	\
    103 			}						\
    104 		} else {						\
    105 			if (_y < _x) {					\
    106 				BRESENHAM(_y, _x, +i, +k, func);	\
    107 			} else {					\
    108 				BRESENHAM(_x, _y, +k, +i, func);	\
    109 			}						\
    110 		}							\
    111 	}								\
    112 })
    113 
    114 #define LINEFUNC(b)							\
    115 static void								\
    116 linebpp##b(struct video_chip *vc, int x0, int y0, int x1, int y1)	\
    117 {									\
    118 	u_int32_t addr;							\
    119 	int i, j, k, len, step, kstep;					\
    120 	int x, _x, y, _y;						\
    121 	int xbase, ybase;						\
    122 	x = x1 - x0;							\
    123 	y = y1 - y0;							\
    124 	_x = abs(x);							\
    125 	_y = abs(y);							\
    126 	xbase = x0;							\
    127 	ybase = y0;							\
    128 	DRAWLINE(BPP##b);						\
    129 }
    130 
    131 #define DOTFUNC(b)							\
    132 static void								\
    133 dotbpp##b(struct video_chip *vc, int x, int y)				\
    134 {									\
    135 	u_int32_t addr;							\
    136 	addr = vc->vc_fbvaddr + (((y * vc->vc_fbwidth + x) *		\
    137 				 vc->vc_fbdepth) >> 3);			\
    138 	BPP##b;								\
    139 }
    140 
    141 LINEFUNC(2)
    142 LINEFUNC(4)
    143 LINEFUNC(8)
    144 DOTFUNC(2)
    145 DOTFUNC(4)
    146 DOTFUNC(8)
    147 static void linebpp_unimpl(struct video_chip *, int, int, int, int);
    148 static void dotbpp_unimpl(struct video_chip *, int, int);
    149 
    150 int
    151 cmap_work_alloc(u_int8_t **r, u_int8_t **g, u_int8_t **b, u_int32_t **rgb,
    152     int cnt)
    153 {
    154 	KASSERT(LEGAL_CLUT_INDEX(cnt - 1));
    155 
    156 #define	ALLOC_BUF(x, bit)						\
    157 	if (x) {							\
    158 		*x = malloc(cnt * sizeof(u_int ## bit ## _t),		\
    159 		    M_DEVBUF, M_WAITOK);				\
    160 		if (*x == 0)						\
    161 			goto errout;					\
    162 	}
    163 	ALLOC_BUF(r, 8);
    164 	ALLOC_BUF(g, 8);
    165 	ALLOC_BUF(b, 8);
    166 	ALLOC_BUF(rgb, 32);
    167 #undef	ALLOCBUF
    168 
    169 	return (0);
    170 errout:
    171 	cmap_work_free(*r, *g, *b, *rgb);
    172 
    173 	return (ENOMEM);
    174 }
    175 
    176 void
    177 cmap_work_free(u_int8_t *r, u_int8_t *g, u_int8_t *b, u_int32_t *rgb)
    178 {
    179 	if (r)
    180 		free(r, M_DEVBUF);
    181 	if (g)
    182 		free(g, M_DEVBUF);
    183 	if (b)
    184 		free(b, M_DEVBUF);
    185 	if (rgb)
    186 		free(rgb, M_DEVBUF);
    187 }
    188 
    189 void
    190 rgb24_compose(u_int32_t *rgb24, u_int8_t *r, u_int8_t *g, u_int8_t *b, int cnt)
    191 {
    192 	int i;
    193 	KASSERT(rgb24 && r && g && b && LEGAL_CLUT_INDEX(cnt - 1));
    194 
    195 	for (i = 0; i < cnt; i++) {
    196 		*rgb24++ = RGB24(r[i], g[i], b[i]);
    197 	}
    198 }
    199 
    200 void
    201 rgb24_decompose(u_int32_t *rgb24, u_int8_t *r, u_int8_t *g, u_int8_t *b,
    202     int cnt)
    203 {
    204 	int i;
    205 	KASSERT(rgb24 && r && g && b && LEGAL_CLUT_INDEX(cnt - 1));
    206 
    207 	for (i = 0; i < cnt; i++) {
    208 		u_int32_t rgb = *rgb24++;
    209 		*r++ = (rgb >> 16) & 0xff;
    210 		*g++ = (rgb >> 8) & 0xff;
    211 		*b++ = rgb & 0xff;
    212 	}
    213 }
    214 
    215 /*
    216  * Debug routines.
    217  */
    218 void
    219 video_calibration_pattern(struct video_chip *vc)
    220 {
    221 	int x, y;
    222 
    223 	x = vc->vc_fbwidth - 40;
    224 	y = vc->vc_fbheight - 40;
    225 	video_line(vc, 40, 40, x , 40);
    226 	video_line(vc, x , 40, x , y );
    227 	video_line(vc, x , y , 40, y );
    228 	video_line(vc, 40, y , 40, 40);
    229 	video_line(vc, 40, 40, x , y );
    230 	video_line(vc, x,  40, 40, y );
    231 }
    232 
    233 static void
    234 linebpp_unimpl(struct video_chip *vc,
    235 	       int x0, int y0,
    236 	       int x1, int y1)
    237 {
    238 
    239 	return;
    240 }
    241 
    242 static void
    243 dotbpp_unimpl(struct video_chip *vc, int x, int y)
    244 {
    245 
    246 	return;
    247 }
    248 
    249 void
    250 video_attach_drawfunc(struct video_chip *vc)
    251 {
    252 	switch (vc->vc_fbdepth) {
    253 	default:
    254 		vc->vc_drawline = linebpp_unimpl;
    255 		vc->vc_drawdot = dotbpp_unimpl;
    256 		break;
    257 	case 8:
    258 		vc->vc_drawline = linebpp8;
    259 		vc->vc_drawdot = dotbpp8;
    260 		break;
    261 	case 4:
    262 		vc->vc_drawline = linebpp4;
    263 		vc->vc_drawdot = dotbpp4;
    264 		break;
    265 	case 2:
    266 		vc->vc_drawline = linebpp2;
    267 		vc->vc_drawdot = dotbpp2;
    268 		break;
    269 	}
    270 }
    271 
    272 void
    273 video_line(struct video_chip *vc, int x0, int y0, int x1, int y1)
    274 {
    275 	if (vc->vc_drawline)
    276 		vc->vc_drawline(vc, x0, y0, x1, y1);
    277 }
    278 
    279 void
    280 video_dot(struct video_chip *vc, int x, int y)
    281 {
    282 	if (vc->vc_drawdot)
    283 		vc->vc_drawdot(vc, x, y);
    284 }
    285 
    286 int
    287 video_reverse_color(void)
    288 {
    289 	struct {
    290 		int reverse, normal;
    291 	} ctype[] = {
    292 		{ BIFB_D2_M2L_3,	BIFB_D2_M2L_0	},
    293 		{ BIFB_D2_M2L_3x2,	BIFB_D2_M2L_0x2	},
    294 		{ BIFB_D8_FF,		BIFB_D8_00	},
    295 		{ BIFB_D16_FFFF,	BIFB_D16_0000,	},
    296 		{ -1, -1 } /* terminator */
    297 	}, *ctypep;
    298 	u_int16_t fbtype;
    299 
    300 	/* check reverse color */
    301 	fbtype = bootinfo->fb_type;
    302 	for (ctypep = ctype; ctypep->normal != -1 ;  ctypep++) {
    303 		if (fbtype == ctypep->normal) {
    304 			return (0);
    305 		} else if (fbtype == ctypep->reverse) {
    306 			return (1);
    307 		}
    308 	}
    309 	printf(": WARNING unknown frame buffer type 0x%04x.\n", fbtype);
    310 	return (0);
    311 }
    312