summaryrefslogtreecommitdiff
path: root/drivers/videomodes.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/videomodes.c')
-rw-r--r--drivers/videomodes.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/videomodes.c b/drivers/videomodes.c
new file mode 100644
index 0000000..418f74c
--- /dev/null
+++ b/drivers/videomodes.c
@@ -0,0 +1,210 @@
+/*
+ * (C) Copyright 2004
+ * Pierre Aubert, Staubli Faverges , <p.aubert@staubli.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/************************************************************************
+ Get Parameters for the video mode:
+ The default video mode can be defined in CFG_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 "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, t;
+ 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;
+ t = 0;
+ 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;
+}
+
+
generated by cgit v1.1 at 2024-11-17 04:47:13 +0000