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