1 /* 2 * (C) Copyright 2004 3 * Pierre Aubert, Staubli Faverges , <p.aubert@staubli.com> 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 /************************************************************************ 25 Get Parameters for the video mode: 26 The default video mode can be defined in CFG_DEFAULT_VIDEO_MODE. 27 If undefined, default video mode is set to 0x301 28 Parameters can be set via the variable "videomode" in the environment. 29 2 diferent ways are possible: 30 "videomode=301" - 301 is a hexadecimal number describing the VESA 31 mode. Following modes are implemented: 32 33 Colors 640x480 800x600 1024x768 1152x864 1280x1024 34 --------+--------------------------------------------- 35 8 bits | 0x301 0x303 0x305 0x161 0x307 36 15 bits | 0x310 0x313 0x316 0x162 0x319 37 16 bits | 0x311 0x314 0x317 0x163 0x31A 38 24 bits | 0x312 0x315 0x318 ? 0x31B 39 --------+--------------------------------------------- 40 "videomode=bootargs" 41 - the parameters are parsed from the bootargs. 42 The format is "NAME:VALUE,NAME:VALUE" etc. 43 Ex.: 44 "bootargs=video=ctfb:x:800,y:600,depth:16,pclk:25000" 45 Parameters not included in the list will be taken from 46 the default mode, which is one of the following: 47 mode:0 640x480x24 48 mode:1 800x600x16 49 mode:2 1024x768x8 50 mode:3 960x720x24 51 mode:4 1152x864x16 52 mode:5 1280x1024x8 53 54 if "mode" is not provided within the parameter list, 55 mode:0 is assumed. 56 Following parameters are supported: 57 x xres = visible resolution horizontal 58 y yres = visible resolution vertical 59 pclk pixelclocks in pico sec 60 le left_marging time from sync to picture in pixelclocks 61 ri right_marging time from picture to sync in pixelclocks 62 up upper_margin time from sync to picture 63 lo lower_margin 64 hs hsync_len length of horizontal sync 65 vs vsync_len length of vertical sync 66 sync see FB_SYNC_* 67 vmode see FB_VMODE_* 68 depth Color depth in bits per pixel 69 All other parameters in the variable bootargs are ignored. 70 It is also possible to set the parameters direct in the 71 variable "videomode", or in another variable i.e. 72 "myvideo" and setting the variable "videomode=myvideo".. 73 ****************************************************************************/ 74 75 #include <common.h> 76 #include "videomodes.h" 77 78 const struct ctfb_vesa_modes vesa_modes[VESA_MODES_COUNT] = { 79 {0x301, RES_MODE_640x480, 8}, 80 {0x310, RES_MODE_640x480, 15}, 81 {0x311, RES_MODE_640x480, 16}, 82 {0x312, RES_MODE_640x480, 24}, 83 {0x303, RES_MODE_800x600, 8}, 84 {0x313, RES_MODE_800x600, 15}, 85 {0x314, RES_MODE_800x600, 16}, 86 {0x315, RES_MODE_800x600, 24}, 87 {0x305, RES_MODE_1024x768, 8}, 88 {0x316, RES_MODE_1024x768, 15}, 89 {0x317, RES_MODE_1024x768, 16}, 90 {0x318, RES_MODE_1024x768, 24}, 91 {0x161, RES_MODE_1152x864, 8}, 92 {0x162, RES_MODE_1152x864, 15}, 93 {0x163, RES_MODE_1152x864, 16}, 94 {0x307, RES_MODE_1280x1024, 8}, 95 {0x319, RES_MODE_1280x1024, 15}, 96 {0x31A, RES_MODE_1280x1024, 16}, 97 {0x31B, RES_MODE_1280x1024, 24}, 98 }; 99 const struct ctfb_res_modes res_mode_init[RES_MODES_COUNT] = { 100 /* x y pixclk le ri up lo hs vs s vmode */ 101 {640, 480, 39721, 40, 24, 32, 11, 96, 2, 0, FB_VMODE_NONINTERLACED}, 102 {800, 600, 27778, 64, 24, 22, 1, 72, 2, 0, FB_VMODE_NONINTERLACED}, 103 {1024, 768, 15384, 168, 8, 29, 3, 144, 4, 0, FB_VMODE_NONINTERLACED}, 104 {960, 720, 13100, 160, 40, 32, 8, 80, 4, 0, FB_VMODE_NONINTERLACED}, 105 {1152, 864, 12004, 200, 64, 32, 16, 80, 4, 0, FB_VMODE_NONINTERLACED}, 106 {1280, 1024, 9090, 200, 48, 26, 1, 184, 3, 0, FB_VMODE_NONINTERLACED}, 107 }; 108 109 /************************************************************************ 110 * Get Parameters for the video mode: 111 */ 112 /********************************************************************* 113 * returns the length to the next seperator 114 */ 115 static int 116 video_get_param_len (char *start, char sep) 117 { 118 int i = 0; 119 while ((*start != 0) && (*start != sep)) { 120 start++; 121 i++; 122 } 123 return i; 124 } 125 126 static int 127 video_search_param (char *start, char *param) 128 { 129 int len, totallen, i; 130 char *p = start; 131 len = strlen (param); 132 totallen = len + strlen (start); 133 for (i = 0; i < totallen; i++) { 134 if (strncmp (p++, param, len) == 0) 135 return (i); 136 } 137 return -1; 138 } 139 140 /*************************************************************** 141 * Get parameter via the environment as it is done for the 142 * linux kernel i.e: 143 * video=ctfb:x:800,xv:1280,y:600,yv:1024,depth:16,mode:0,pclk:25000, 144 * le:56,ri:48,up:26,lo:5,hs:152,vs:2,sync:0,vmode:0,accel:0 145 * 146 * penv is a pointer to the environment, containing the string, or the name of 147 * another environment variable. It could even be the term "bootargs" 148 */ 149 150 #define GET_OPTION(name,var) \ 151 if(strncmp(p,name,strlen(name))==0) { \ 152 val_s=p+strlen(name); \ 153 var=simple_strtoul(val_s, NULL, 10); \ 154 } 155 156 int video_get_params (struct ctfb_res_modes *pPar, char *penv) 157 { 158 char *p, *s, *val_s; 159 int i = 0, t; 160 int bpp; 161 int mode; 162 /* first search for the environment containing the real param string */ 163 s = penv; 164 if ((p = getenv (s)) != NULL) { 165 s = p; 166 } 167 /* in case of the bootargs line, we have to start 168 * after "video=ctfb:" 169 */ 170 i = video_search_param (s, "video=ctfb:"); 171 if (i >= 0) { 172 s += i; 173 s += strlen ("video=ctfb:"); 174 } 175 /* search for mode as a default value */ 176 p = s; 177 t = 0; 178 mode = 0; /* default */ 179 while ((i = video_get_param_len (p, ',')) != 0) { 180 GET_OPTION ("mode:", mode) 181 p += i; 182 if (*p != 0) 183 p++; /* skip ',' */ 184 } 185 if (mode >= RES_MODES_COUNT) 186 mode = 0; 187 *pPar = res_mode_init[mode]; /* copy default values */ 188 bpp = 24 - ((mode % 3) * 8); 189 p = s; /* restart */ 190 while ((i = video_get_param_len (p, ',')) != 0) { 191 GET_OPTION ("x:", pPar->xres) 192 GET_OPTION ("y:", pPar->yres) 193 GET_OPTION ("le:", pPar->left_margin) 194 GET_OPTION ("ri:", pPar->right_margin) 195 GET_OPTION ("up:", pPar->upper_margin) 196 GET_OPTION ("lo:", pPar->lower_margin) 197 GET_OPTION ("hs:", pPar->hsync_len) 198 GET_OPTION ("vs:", pPar->vsync_len) 199 GET_OPTION ("sync:", pPar->sync) 200 GET_OPTION ("vmode:", pPar->vmode) 201 GET_OPTION ("pclk:", pPar->pixclock) 202 GET_OPTION ("depth:", bpp) 203 p += i; 204 if (*p != 0) 205 p++; /* skip ',' */ 206 } 207 return bpp; 208 } 209