3 * Pierre Aubert, Staubli Faverges , <p.aubert@staubli.com>
4 * Copyright 2011 Freescale Semiconductor, Inc.
6 * SPDX-License-Identifier: GPL-2.0+
9 /************************************************************************
10 Get Parameters for the video mode:
11 The default video mode can be defined in CONFIG_SYS_DEFAULT_VIDEO_MODE.
12 If undefined, default video mode is set to 0x301
13 Parameters can be set via the variable "videomode" in the environment.
14 2 diferent ways are possible:
15 "videomode=301" - 301 is a hexadecimal number describing the VESA
16 mode. Following modes are implemented:
18 Colors 640x480 800x600 1024x768 1152x864 1280x1024
19 --------+---------------------------------------------
20 8 bits | 0x301 0x303 0x305 0x161 0x307
21 15 bits | 0x310 0x313 0x316 0x162 0x319
22 16 bits | 0x311 0x314 0x317 0x163 0x31A
23 24 bits | 0x312 0x315 0x318 ? 0x31B
24 --------+---------------------------------------------
26 - the parameters are parsed from the bootargs.
27 The format is "NAME:VALUE,NAME:VALUE" etc.
29 "bootargs=video=ctfb:x:800,y:600,depth:16,pclk:25000"
30 Parameters not included in the list will be taken from
31 the default mode, which is one of the following:
39 if "mode" is not provided within the parameter list,
41 Following parameters are supported:
42 x xres = visible resolution horizontal
43 y yres = visible resolution vertical
44 pclk pixelclocks in pico sec
45 le left_marging time from sync to picture in pixelclocks
46 ri right_marging time from picture to sync in pixelclocks
47 up upper_margin time from sync to picture
49 hs hsync_len length of horizontal sync
50 vs vsync_len length of vertical sync
53 depth Color depth in bits per pixel
54 All other parameters in the variable bootargs are ignored.
55 It is also possible to set the parameters direct in the
56 variable "videomode", or in another variable i.e.
57 "myvideo" and setting the variable "videomode=myvideo"..
58 ****************************************************************************/
61 #include <linux/ctype.h>
63 #include "videomodes.h"
65 const struct ctfb_vesa_modes vesa_modes[VESA_MODES_COUNT] = {
66 {0x301, RES_MODE_640x480, 8},
67 {0x310, RES_MODE_640x480, 15},
68 {0x311, RES_MODE_640x480, 16},
69 {0x312, RES_MODE_640x480, 24},
70 {0x303, RES_MODE_800x600, 8},
71 {0x313, RES_MODE_800x600, 15},
72 {0x314, RES_MODE_800x600, 16},
73 {0x315, RES_MODE_800x600, 24},
74 {0x305, RES_MODE_1024x768, 8},
75 {0x316, RES_MODE_1024x768, 15},
76 {0x317, RES_MODE_1024x768, 16},
77 {0x318, RES_MODE_1024x768, 24},
78 {0x161, RES_MODE_1152x864, 8},
79 {0x162, RES_MODE_1152x864, 15},
80 {0x163, RES_MODE_1152x864, 16},
81 {0x307, RES_MODE_1280x1024, 8},
82 {0x319, RES_MODE_1280x1024, 15},
83 {0x31A, RES_MODE_1280x1024, 16},
84 {0x31B, RES_MODE_1280x1024, 24},
86 const struct ctfb_res_modes res_mode_init[RES_MODES_COUNT] = {
87 /* x y hz pixclk ps/kHz le ri up lo hs vs s vmode */
88 #ifndef CONFIG_VIDEO_STD_TIMINGS
89 { 640, 480, 60, 39721, 25180, 40, 24, 32, 11, 96, 2, 0, FB_VMODE_NONINTERLACED},
90 { 800, 600, 60, 27778, 36000, 64, 24, 22, 1, 72, 2, 0, FB_VMODE_NONINTERLACED},
91 {1024, 768, 60, 15384, 65000, 168, 8, 29, 3, 144, 4, 0, FB_VMODE_NONINTERLACED},
92 { 960, 720, 80, 13100, 76335, 160, 40, 32, 8, 80, 4, 0, FB_VMODE_NONINTERLACED},
93 {1152, 864, 60, 12004, 83300, 200, 64, 32, 16, 80, 4, 0, FB_VMODE_NONINTERLACED},
94 {1280, 1024, 60, 9090, 110000, 200, 48, 26, 1, 184, 3, 0, FB_VMODE_NONINTERLACED},
96 { 640, 480, 60, 39683, 25200, 48, 16, 33, 10, 96, 2, 0, FB_VMODE_NONINTERLACED},
97 { 800, 600, 60, 25000, 40000, 88, 40, 23, 1, 128, 4, FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED},
98 {1024, 768, 60, 15384, 65000, 160, 24, 29, 3, 136, 6, 0, FB_VMODE_NONINTERLACED},
99 { 960, 720, 75, 13468, 74250, 176, 72, 27, 1, 112, 2, 0, FB_VMODE_NONINTERLACED},
100 {1152, 864, 75, 9259, 108000, 256, 64, 32, 1, 128, 3, FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED},
101 {1280, 1024, 60, 9259, 108000, 248, 48, 38, 1, 112, 3, FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, FB_VMODE_NONINTERLACED},
105 /************************************************************************
106 * Get Parameters for the video mode:
108 /*********************************************************************
109 * returns the length to the next seperator
112 video_get_param_len (char *start, char sep)
115 while ((*start != 0) && (*start != sep)) {
123 video_search_param (char *start, char *param)
125 int len, totallen, i;
127 len = strlen (param);
128 totallen = len + strlen (start);
129 for (i = 0; i < totallen; i++) {
130 if (strncmp (p++, param, len) == 0)
136 /***************************************************************
137 * Get parameter via the environment as it is done for the
139 * video=ctfb:x:800,xv:1280,y:600,yv:1024,depth:16,mode:0,pclk:25000,
140 * le:56,ri:48,up:26,lo:5,hs:152,vs:2,sync:0,vmode:0,accel:0
142 * penv is a pointer to the environment, containing the string, or the name of
143 * another environment variable. It could even be the term "bootargs"
146 #define GET_OPTION(name,var) \
147 if(strncmp(p,name,strlen(name))==0) { \
148 val_s=p+strlen(name); \
149 var=simple_strtoul(val_s, NULL, 10); \
152 int video_get_params (struct ctfb_res_modes *pPar, char *penv)
159 /* first search for the environment containing the real param string */
162 if ((p = getenv (s)) != NULL)
166 * in case of the bootargs line, we have to start
167 * after "video=ctfb:"
169 i = video_search_param (s, "video=ctfb:");
172 s += strlen ("video=ctfb:");
174 /* search for mode as a default value */
176 mode = 0; /* default */
178 while ((i = video_get_param_len (p, ',')) != 0) {
179 GET_OPTION ("mode:", mode)
185 if (mode >= RES_MODES_COUNT)
188 *pPar = res_mode_init[mode]; /* copy default values */
189 bpp = 24 - ((mode % 3) * 8);
192 while ((i = video_get_param_len (p, ',')) != 0) {
193 GET_OPTION ("x:", pPar->xres)
194 GET_OPTION ("y:", pPar->yres)
195 GET_OPTION ("refresh:", pPar->refresh)
196 GET_OPTION ("le:", pPar->left_margin)
197 GET_OPTION ("ri:", pPar->right_margin)
198 GET_OPTION ("up:", pPar->upper_margin)
199 GET_OPTION ("lo:", pPar->lower_margin)
200 GET_OPTION ("hs:", pPar->hsync_len)
201 GET_OPTION ("vs:", pPar->vsync_len)
202 GET_OPTION ("sync:", pPar->sync)
203 GET_OPTION ("vmode:", pPar->vmode)
204 GET_OPTION ("pclk:", pPar->pixclock)
205 GET_OPTION ("pclk_khz:", pPar->pixclock_khz)
206 GET_OPTION ("depth:", bpp)
215 * Parse the 'video-mode' environment variable
217 * Example: "video-mode=fslfb:1280x1024-32@60,monitor=dvi". See
218 * doc/README.video for more information on how to set the variable.
220 * @xres: returned value of X-resolution
221 * @yres: returned value of Y-resolution
222 * @depth: returned value of color depth
223 * @freq: returned value of monitor frequency
224 * @options: pointer to any remaining options, or NULL
226 * Returns 1 if valid values were found, 0 otherwise
228 int video_get_video_mode(unsigned int *xres, unsigned int *yres,
229 unsigned int *depth, unsigned int *freq, const char **options)
231 char *p = getenv("video-mode");
235 /* Skip over the driver name, which we don't care about. */
240 /* Get the X-resolution*/
241 while (*p && !isdigit(*p))
243 *xres = simple_strtoul(p, &p, 10);
247 /* Get the Y-resolution */
248 while (*p && !isdigit(*p))
250 *yres = simple_strtoul(p, &p, 10);
255 while (*p && !isdigit(*p))
257 *depth = simple_strtoul(p, &p, 10);
261 /* Get the frequency */
262 while (*p && !isdigit(*p))
264 *freq = simple_strtoul(p, &p, 10);
268 /* Find the extra options, if any */
270 *options = p ? p + 1 : NULL;