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263 lines
7.6 KiB
C
263 lines
7.6 KiB
C
/*
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* (C) Copyright 2004
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* Pierre Aubert, Staubli Faverges , <p.aubert@staubli.com>
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* Copyright 2011 Freescale Semiconductor, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/************************************************************************
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Get Parameters for the video mode:
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The default video mode can be defined in CONFIG_SYS_DEFAULT_VIDEO_MODE.
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If undefined, default video mode is set to 0x301
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Parameters can be set via the variable "videomode" in the environment.
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2 diferent ways are possible:
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"videomode=301" - 301 is a hexadecimal number describing the VESA
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mode. Following modes are implemented:
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Colors 640x480 800x600 1024x768 1152x864 1280x1024
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--------+---------------------------------------------
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8 bits | 0x301 0x303 0x305 0x161 0x307
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15 bits | 0x310 0x313 0x316 0x162 0x319
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16 bits | 0x311 0x314 0x317 0x163 0x31A
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24 bits | 0x312 0x315 0x318 ? 0x31B
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--------+---------------------------------------------
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"videomode=bootargs"
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- the parameters are parsed from the bootargs.
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The format is "NAME:VALUE,NAME:VALUE" etc.
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Ex.:
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"bootargs=video=ctfb:x:800,y:600,depth:16,pclk:25000"
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Parameters not included in the list will be taken from
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the default mode, which is one of the following:
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mode:0 640x480x24
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mode:1 800x600x16
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mode:2 1024x768x8
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mode:3 960x720x24
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mode:4 1152x864x16
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mode:5 1280x1024x8
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if "mode" is not provided within the parameter list,
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mode:0 is assumed.
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Following parameters are supported:
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x xres = visible resolution horizontal
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y yres = visible resolution vertical
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pclk pixelclocks in pico sec
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le left_marging time from sync to picture in pixelclocks
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ri right_marging time from picture to sync in pixelclocks
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up upper_margin time from sync to picture
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lo lower_margin
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hs hsync_len length of horizontal sync
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vs vsync_len length of vertical sync
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sync see FB_SYNC_*
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vmode see FB_VMODE_*
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depth Color depth in bits per pixel
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All other parameters in the variable bootargs are ignored.
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It is also possible to set the parameters direct in the
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variable "videomode", or in another variable i.e.
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"myvideo" and setting the variable "videomode=myvideo"..
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****************************************************************************/
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#include <common.h>
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#include <linux/ctype.h>
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#include "videomodes.h"
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const struct ctfb_vesa_modes vesa_modes[VESA_MODES_COUNT] = {
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{0x301, RES_MODE_640x480, 8},
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{0x310, RES_MODE_640x480, 15},
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{0x311, RES_MODE_640x480, 16},
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{0x312, RES_MODE_640x480, 24},
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{0x303, RES_MODE_800x600, 8},
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{0x313, RES_MODE_800x600, 15},
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{0x314, RES_MODE_800x600, 16},
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{0x315, RES_MODE_800x600, 24},
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{0x305, RES_MODE_1024x768, 8},
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{0x316, RES_MODE_1024x768, 15},
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{0x317, RES_MODE_1024x768, 16},
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{0x318, RES_MODE_1024x768, 24},
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{0x161, RES_MODE_1152x864, 8},
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{0x162, RES_MODE_1152x864, 15},
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{0x163, RES_MODE_1152x864, 16},
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{0x307, RES_MODE_1280x1024, 8},
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{0x319, RES_MODE_1280x1024, 15},
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{0x31A, RES_MODE_1280x1024, 16},
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{0x31B, RES_MODE_1280x1024, 24},
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};
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const struct ctfb_res_modes res_mode_init[RES_MODES_COUNT] = {
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/* x y pixclk le ri up lo hs vs s vmode */
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{640, 480, 39721, 40, 24, 32, 11, 96, 2, 0, FB_VMODE_NONINTERLACED},
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{800, 600, 27778, 64, 24, 22, 1, 72, 2, 0, FB_VMODE_NONINTERLACED},
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{1024, 768, 15384, 168, 8, 29, 3, 144, 4, 0, FB_VMODE_NONINTERLACED},
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{960, 720, 13100, 160, 40, 32, 8, 80, 4, 0, FB_VMODE_NONINTERLACED},
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{1152, 864, 12004, 200, 64, 32, 16, 80, 4, 0, FB_VMODE_NONINTERLACED},
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{1280, 1024, 9090, 200, 48, 26, 1, 184, 3, 0, FB_VMODE_NONINTERLACED},
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};
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/************************************************************************
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* Get Parameters for the video mode:
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*/
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/*********************************************************************
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* returns the length to the next seperator
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*/
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static int
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video_get_param_len (char *start, char sep)
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{
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int i = 0;
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while ((*start != 0) && (*start != sep)) {
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start++;
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i++;
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}
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return i;
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}
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static int
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video_search_param (char *start, char *param)
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{
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int len, totallen, i;
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char *p = start;
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len = strlen (param);
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totallen = len + strlen (start);
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for (i = 0; i < totallen; i++) {
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if (strncmp (p++, param, len) == 0)
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return (i);
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}
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return -1;
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}
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/***************************************************************
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* Get parameter via the environment as it is done for the
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* linux kernel i.e:
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* video=ctfb:x:800,xv:1280,y:600,yv:1024,depth:16,mode:0,pclk:25000,
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* le:56,ri:48,up:26,lo:5,hs:152,vs:2,sync:0,vmode:0,accel:0
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*
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* penv is a pointer to the environment, containing the string, or the name of
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* another environment variable. It could even be the term "bootargs"
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*/
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#define GET_OPTION(name,var) \
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if(strncmp(p,name,strlen(name))==0) { \
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val_s=p+strlen(name); \
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var=simple_strtoul(val_s, NULL, 10); \
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}
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int video_get_params (struct ctfb_res_modes *pPar, char *penv)
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{
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char *p, *s, *val_s;
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int i = 0;
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int bpp;
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int mode;
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/* first search for the environment containing the real param string */
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s = penv;
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if ((p = getenv (s)) != NULL)
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s = p;
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/*
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* in case of the bootargs line, we have to start
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* after "video=ctfb:"
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*/
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i = video_search_param (s, "video=ctfb:");
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if (i >= 0) {
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s += i;
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s += strlen ("video=ctfb:");
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}
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/* search for mode as a default value */
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p = s;
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mode = 0; /* default */
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while ((i = video_get_param_len (p, ',')) != 0) {
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GET_OPTION ("mode:", mode)
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p += i;
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if (*p != 0)
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p++; /* skip ',' */
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}
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if (mode >= RES_MODES_COUNT)
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mode = 0;
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*pPar = res_mode_init[mode]; /* copy default values */
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bpp = 24 - ((mode % 3) * 8);
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p = s; /* restart */
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while ((i = video_get_param_len (p, ',')) != 0) {
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GET_OPTION ("x:", pPar->xres)
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GET_OPTION ("y:", pPar->yres)
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GET_OPTION ("le:", pPar->left_margin)
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GET_OPTION ("ri:", pPar->right_margin)
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GET_OPTION ("up:", pPar->upper_margin)
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GET_OPTION ("lo:", pPar->lower_margin)
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GET_OPTION ("hs:", pPar->hsync_len)
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GET_OPTION ("vs:", pPar->vsync_len)
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GET_OPTION ("sync:", pPar->sync)
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GET_OPTION ("vmode:", pPar->vmode)
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GET_OPTION ("pclk:", pPar->pixclock)
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GET_OPTION ("depth:", bpp)
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p += i;
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if (*p != 0)
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p++; /* skip ',' */
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}
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return bpp;
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}
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/*
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* Parse the 'video-mode' environment variable
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*
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* Example: "video-mode=fslfb:1280x1024-32@60,monitor=dvi". See
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* doc/README.video for more information on how to set the variable.
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*
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* @xres: returned value of X-resolution
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* @yres: returned value of Y-resolution
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* @depth: returned value of color depth
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* @freq: returned value of monitor frequency
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* @options: pointer to any remaining options, or NULL
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*
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* Returns 1 if valid values were found, 0 otherwise
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*/
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int video_get_video_mode(unsigned int *xres, unsigned int *yres,
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unsigned int *depth, unsigned int *freq, const char **options)
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{
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char *p = getenv("video-mode");
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if (!p)
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return 0;
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/* Skip over the driver name, which we don't care about. */
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p = strchr(p, ':');
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if (!p)
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return 0;
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/* Get the X-resolution*/
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while (*p && !isdigit(*p))
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p++;
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*xres = simple_strtoul(p, &p, 10);
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if (!*xres)
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return 0;
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/* Get the Y-resolution */
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while (*p && !isdigit(*p))
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p++;
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*yres = simple_strtoul(p, &p, 10);
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if (!*yres)
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return 0;
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/* Get the depth */
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while (*p && !isdigit(*p))
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p++;
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*depth = simple_strtoul(p, &p, 10);
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if (!*depth)
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return 0;
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/* Get the frequency */
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while (*p && !isdigit(*p))
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p++;
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*freq = simple_strtoul(p, &p, 10);
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if (!*freq)
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return 0;
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/* Find the extra options, if any */
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p = strchr(p, ',');
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*options = p ? p + 1 : NULL;
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return 1;
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}
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