u-boot/board/compulab/cm_t35/display.c

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/*
* (C) Copyright 2012 - 2013 CompuLab, Ltd. <www.compulab.co.il>
*
* Authors: Nikita Kiryanov <nikita@compulab.co.il>
*
* Parsing code based on linux/drivers/video/pxafb.c
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <stdio_dev.h>
#include <asm/arch/dss.h>
#include <lcd.h>
#include <asm/arch-omap3/dss.h>
DECLARE_GLOBAL_DATA_PTR;
enum display_type {
NONE,
DVI,
DVI_CUSTOM,
};
#define CMAP_ADDR 0x80100000
/*
* The frame buffer is allocated before we have the chance to parse user input.
* To make sure enough memory is allocated for all resolutions, we define
* vl_{col | row} to the maximal resolution supported by OMAP3.
*/
vidinfo_t panel_info = {
.vl_col = 1400,
.vl_row = 1050,
.vl_bpix = LCD_BPP,
.cmap = (ushort *)CMAP_ADDR,
};
static struct panel_config panel_cfg;
static enum display_type lcd_def;
/*
* A note on DVI presets;
* U-Boot can convert 8 bit BMP data to 16 bit BMP data, and OMAP DSS can
* convert 16 bit data into 24 bit data. Thus, GFXFORMAT_RGB16 allows us to
* support two BMP types with one setting.
*/
static const struct panel_config preset_dvi_640X480 = {
.lcd_size = PANEL_LCD_SIZE(640, 480),
.timing_h = DSS_HBP(48) | DSS_HFP(16) | DSS_HSW(96),
.timing_v = DSS_VBP(33) | DSS_VFP(10) | DSS_VSW(2),
.divisor = 12 | (1 << 16),
.data_lines = LCD_INTERFACE_24_BIT,
.panel_type = ACTIVE_DISPLAY,
.load_mode = 2,
.gfx_format = GFXFORMAT_RGB16,
};
static const struct panel_config preset_dvi_800X600 = {
.lcd_size = PANEL_LCD_SIZE(800, 600),
.timing_h = DSS_HBP(88) | DSS_HFP(40) | DSS_HSW(128),
.timing_v = DSS_VBP(23) | DSS_VFP(1) | DSS_VSW(4),
.divisor = 8 | (1 << 16),
.data_lines = LCD_INTERFACE_24_BIT,
.panel_type = ACTIVE_DISPLAY,
.load_mode = 2,
.gfx_format = GFXFORMAT_RGB16,
};
static const struct panel_config preset_dvi_1024X768 = {
.lcd_size = PANEL_LCD_SIZE(1024, 768),
.timing_h = DSS_HBP(160) | DSS_HFP(24) | DSS_HSW(136),
.timing_v = DSS_VBP(29) | DSS_VFP(3) | DSS_VSW(6),
.divisor = 5 | (1 << 16),
.data_lines = LCD_INTERFACE_24_BIT,
.panel_type = ACTIVE_DISPLAY,
.load_mode = 2,
.gfx_format = GFXFORMAT_RGB16,
};
static const struct panel_config preset_dvi_1152X864 = {
.lcd_size = PANEL_LCD_SIZE(1152, 864),
.timing_h = DSS_HBP(256) | DSS_HFP(64) | DSS_HSW(128),
.timing_v = DSS_VBP(32) | DSS_VFP(1) | DSS_VSW(3),
.divisor = 3 | (1 << 16),
.data_lines = LCD_INTERFACE_24_BIT,
.panel_type = ACTIVE_DISPLAY,
.load_mode = 2,
.gfx_format = GFXFORMAT_RGB16,
};
static const struct panel_config preset_dvi_1280X960 = {
.lcd_size = PANEL_LCD_SIZE(1280, 960),
.timing_h = DSS_HBP(312) | DSS_HFP(96) | DSS_HSW(112),
.timing_v = DSS_VBP(36) | DSS_VFP(1) | DSS_VSW(3),
.divisor = 3 | (1 << 16),
.data_lines = LCD_INTERFACE_24_BIT,
.panel_type = ACTIVE_DISPLAY,
.load_mode = 2,
.gfx_format = GFXFORMAT_RGB16,
};
static const struct panel_config preset_dvi_1280X1024 = {
.lcd_size = PANEL_LCD_SIZE(1280, 1024),
.timing_h = DSS_HBP(248) | DSS_HFP(48) | DSS_HSW(112),
.timing_v = DSS_VBP(38) | DSS_VFP(1) | DSS_VSW(3),
.divisor = 3 | (1 << 16),
.data_lines = LCD_INTERFACE_24_BIT,
.panel_type = ACTIVE_DISPLAY,
.load_mode = 2,
.gfx_format = GFXFORMAT_RGB16,
};
/*
* set_resolution_params()
*
* Due to usage of multiple display related APIs resolution data is located in
* more than one place. This function updates them all.
*/
static void set_resolution_params(int x, int y)
{
panel_cfg.lcd_size = PANEL_LCD_SIZE(x, y);
panel_info.vl_col = x;
panel_info.vl_row = y;
lcd_line_length = (panel_info.vl_col * NBITS(panel_info.vl_bpix)) / 8;
}
static void set_preset(const struct panel_config preset, int x_res, int y_res)
{
panel_cfg = preset;
set_resolution_params(x_res, y_res);
}
static enum display_type set_dvi_preset(const struct panel_config preset,
int x_res, int y_res)
{
set_preset(preset, x_res, y_res);
return DVI;
}
/*
* parse_mode() - parse the mode parameter of custom lcd settings
*
* @mode: <res_x>x<res_y>
*
* Returns -1 on error, 0 on success.
*/
static int parse_mode(const char *mode)
{
unsigned int modelen = strlen(mode);
int res_specified = 0;
unsigned int xres = 0, yres = 0;
int yres_specified = 0;
int i;
for (i = modelen - 1; i >= 0; i--) {
switch (mode[i]) {
case 'x':
if (!yres_specified) {
yres = simple_strtoul(&mode[i + 1], NULL, 0);
yres_specified = 1;
} else {
goto done_parsing;
}
break;
case '0' ... '9':
break;
default:
goto done_parsing;
}
}
if (i < 0 && yres_specified) {
xres = simple_strtoul(mode, NULL, 0);
res_specified = 1;
}
done_parsing:
if (res_specified) {
set_resolution_params(xres, yres);
} else {
printf("LCD: invalid mode: %s\n", mode);
return -1;
}
return 0;
}
#define PIXEL_CLK_NUMERATOR (26 * 432 / 39)
/*
* parse_pixclock() - Parse the pixclock parameter of custom lcd settings
*
* @pixclock: the desired pixel clock
*
* Returns -1 on error, 0 on success.
*
* Handling the pixel_clock:
*
* Pixel clock is defined in the OMAP35x TRM as follows:
* pixel_clock =
* (SYS_CLK * 2 * PRCM.CM_CLKSEL2_PLL[18:8]) /
* (DSS.DISPC_DIVISOR[23:16] * DSS.DISPC_DIVISOR[6:0] *
* PRCM.CM_CLKSEL_DSS[4:0] * (PRCM.CM_CLKSEL2_PLL[6:0] + 1))
*
* In practice, this means that in order to set the
* divisor for the desired pixel clock one needs to
* solve the following equation:
*
* 26 * 432 / (39 * <pixel_clock>) = DSS.DISPC_DIVISOR[6:0]
*
* NOTE: the explicit equation above is reduced. Do not
* try to infer anything from these numbers.
*/
static int parse_pixclock(char *pixclock)
{
int divisor, pixclock_val;
char *pixclk_start = pixclock;
pixclock_val = simple_strtoul(pixclock, &pixclock, 10);
divisor = DIV_ROUND_UP(PIXEL_CLK_NUMERATOR, pixclock_val);
/* 0 and 1 are illegal values for PCD */
if (divisor <= 1)
divisor = 2;
panel_cfg.divisor = divisor | (1 << 16);
if (pixclock[0] != '\0') {
printf("LCD: invalid value for pixclock:%s\n", pixclk_start);
return -1;
}
return 0;
}
/*
* parse_setting() - parse a single setting of custom lcd parameters
*
* @setting: The custom lcd setting <name>:<value>
*
* Returns -1 on failure, 0 on success.
*/
static int parse_setting(char *setting)
{
int num_val;
char *setting_start = setting;
if (!strncmp(setting, "mode:", 5)) {
return parse_mode(setting + 5);
} else if (!strncmp(setting, "pixclock:", 9)) {
return parse_pixclock(setting + 9);
} else if (!strncmp(setting, "left:", 5)) {
num_val = simple_strtoul(setting + 5, &setting, 0);
panel_cfg.timing_h |= DSS_HBP(num_val);
} else if (!strncmp(setting, "right:", 6)) {
num_val = simple_strtoul(setting + 6, &setting, 0);
panel_cfg.timing_h |= DSS_HFP(num_val);
} else if (!strncmp(setting, "upper:", 6)) {
num_val = simple_strtoul(setting + 6, &setting, 0);
panel_cfg.timing_v |= DSS_VBP(num_val);
} else if (!strncmp(setting, "lower:", 6)) {
num_val = simple_strtoul(setting + 6, &setting, 0);
panel_cfg.timing_v |= DSS_VFP(num_val);
} else if (!strncmp(setting, "hsynclen:", 9)) {
num_val = simple_strtoul(setting + 9, &setting, 0);
panel_cfg.timing_h |= DSS_HSW(num_val);
} else if (!strncmp(setting, "vsynclen:", 9)) {
num_val = simple_strtoul(setting + 9, &setting, 0);
panel_cfg.timing_v |= DSS_VSW(num_val);
} else if (!strncmp(setting, "hsync:", 6)) {
if (simple_strtoul(setting + 6, &setting, 0) == 0)
panel_cfg.pol_freq |= DSS_IHS;
else
panel_cfg.pol_freq &= ~DSS_IHS;
} else if (!strncmp(setting, "vsync:", 6)) {
if (simple_strtoul(setting + 6, &setting, 0) == 0)
panel_cfg.pol_freq |= DSS_IVS;
else
panel_cfg.pol_freq &= ~DSS_IVS;
} else if (!strncmp(setting, "outputen:", 9)) {
if (simple_strtoul(setting + 9, &setting, 0) == 0)
panel_cfg.pol_freq |= DSS_IEO;
else
panel_cfg.pol_freq &= ~DSS_IEO;
} else if (!strncmp(setting, "pixclockpol:", 12)) {
if (simple_strtoul(setting + 12, &setting, 0) == 0)
panel_cfg.pol_freq |= DSS_IPC;
else
panel_cfg.pol_freq &= ~DSS_IPC;
} else if (!strncmp(setting, "active", 6)) {
panel_cfg.panel_type = ACTIVE_DISPLAY;
return 0; /* Avoid sanity check below */
} else if (!strncmp(setting, "passive", 7)) {
panel_cfg.panel_type = PASSIVE_DISPLAY;
return 0; /* Avoid sanity check below */
} else if (!strncmp(setting, "display:", 8)) {
if (!strncmp(setting + 8, "dvi", 3)) {
lcd_def = DVI_CUSTOM;
return 0; /* Avoid sanity check below */
}
} else {
printf("LCD: unknown option %s\n", setting_start);
return -1;
}
if (setting[0] != '\0') {
printf("LCD: invalid value for %s\n", setting_start);
return -1;
}
return 0;
}
/*
* env_parse_customlcd() - parse custom lcd params from an environment variable.
*
* @custom_lcd_params: The environment variable containing the lcd params.
*
* Returns -1 on failure, 0 on success.
*/
static int parse_customlcd(char *custom_lcd_params)
{
char params_cpy[160];
char *setting;
strncpy(params_cpy, custom_lcd_params, 160);
setting = strtok(params_cpy, ",");
while (setting) {
if (parse_setting(setting) < 0)
return -1;
setting = strtok(NULL, ",");
}
/* Currently we don't support changing this via custom lcd params */
panel_cfg.data_lines = LCD_INTERFACE_24_BIT;
panel_cfg.gfx_format = GFXFORMAT_RGB16; /* See dvi predefines note */
return 0;
}
/*
* env_parse_displaytype() - parse display type.
*
* Parses the environment variable "displaytype", which contains the
* name of the display type or preset, in which case it applies its
* configurations.
*
* Returns the type of display that was specified.
*/
static enum display_type env_parse_displaytype(char *displaytype)
{
if (!strncmp(displaytype, "dvi640x480", 10))
return set_dvi_preset(preset_dvi_640X480, 640, 480);
else if (!strncmp(displaytype, "dvi800x600", 10))
return set_dvi_preset(preset_dvi_800X600, 800, 600);
else if (!strncmp(displaytype, "dvi1024x768", 11))
return set_dvi_preset(preset_dvi_1024X768, 1024, 768);
else if (!strncmp(displaytype, "dvi1152x864", 11))
return set_dvi_preset(preset_dvi_1152X864, 1152, 864);
else if (!strncmp(displaytype, "dvi1280x960", 11))
return set_dvi_preset(preset_dvi_1280X960, 1280, 960);
else if (!strncmp(displaytype, "dvi1280x1024", 12))
return set_dvi_preset(preset_dvi_1280X1024, 1280, 1024);
return NONE;
}
void lcd_ctrl_init(void *lcdbase)
{
struct prcm *prcm = (struct prcm *)PRCM_BASE;
char *custom_lcd;
char *displaytype = getenv("displaytype");
if (displaytype == NULL)
return;
lcd_def = env_parse_displaytype(displaytype);
/* If we did not recognize the preset, check if it's an env variable */
if (lcd_def == NONE) {
custom_lcd = getenv(displaytype);
if (custom_lcd == NULL || parse_customlcd(custom_lcd) < 0)
return;
}
panel_cfg.frame_buffer = lcdbase;
omap3_dss_panel_config(&panel_cfg);
/*
* Pixel clock is defined with many divisions and only few
* multiplications of the system clock. Since DSS FCLK divisor is set
* to 16 by default, we need to set it to a smaller value, like 3
* (chosen via trial and error).
*/
clrsetbits_le32(&prcm->clksel_dss, 0xF, 3);
}
void lcd_enable(void)
{
if (lcd_def == DVI || lcd_def == DVI_CUSTOM) {
gpio_direction_output(54, 0); /* Turn on DVI */
omap3_dss_enable();
}
}
void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue) {}