cm-t35: move the display code to common place

Compulab OMAP3 boards use the same display initialization code.
Move the display initialization code to live under board/compulab/common
directory.

Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>
Tested-by: Nikita Kiryanov <nikita@compulab.co.il>

2 files changed, 407 insertions, 0 deletions

diff --git a/board/compulab/common/Makefile b/board/compulab/common/Makefile
index ec2e510cd..b399c8f46 100644
--- a/board/compulab/common/Makefile
+++ b/board/compulab/common/Makefile
@@ -15,6 +15,7 @@ endif
 LIB	= $(obj)lib$(VENDOR).o
 
 COBJS-$(CONFIG_DRIVER_OMAP34XX_I2C) += eeprom.o
+COBJS-$(CONFIG_LCD) += omap3_display.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/board/compulab/common/omap3_display.c b/board/compulab/common/omap3_display.c
new file mode 100644
index 000000000..fae8d9540
--- /dev/null
+++ b/board/compulab/common/omap3_display.c
@@ -0,0 +1,406 @@
+/*
+ * (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) {}