ENGR00315499-7 Add EPDC splash screen for MX 6DL SabreSD and 6SL EVK

Add EPDC splash screen feature for MX6SL EVK, and MX6DL SABRESD board.

- Currently, splash screen consists of a simple black border
  around a white screen.  Done this way to save in memory footprint.

- EPDC splash screen is disabled by default in the config file for MX6DL_SABRESD
  and MX6SL_EVK.  If left enabled, the U-Boot image will not boot correctly
  (hang), since some additional content on the boot device (waveform file) is
  required for EPDC splash to work correctly.

Please refer to Linux Reference Manual for how to flash WAVEFORM file.

Signed-off-by: Robby Cai <R63905@freescale.com>
Signed-off-by: Nitin Garg <nitin.garg@freescale.com>

2 files changed, 455 insertions, 0 deletions

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index c527029..d13dc08 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -40,3 +40,4 @@ obj-$(CONFIG_VIDEO_SMI_LYNXEM) += smiLynxEM.o videomodes.o
 obj-$(CONFIG_VIDEO_TEGRA) += tegra.o
 obj-$(CONFIG_VIDEO_VCXK) += bus_vcxk.o
 obj-$(CONFIG_FORMIKE) += formike.o
+obj-$(CONFIG_MXC_EPDC) += mxc_epdc_fb.o
diff --git a/drivers/video/mxc_epdc_fb.c b/drivers/video/mxc_epdc_fb.c
new file mode 100644
index 0000000..5a400e1
--- /dev/null
+++ b/drivers/video/mxc_epdc_fb.c
@@ -0,0 +1,454 @@
+/*
+ * Copyright (C) 2010-2014 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+/*
+ * Based on STMP378X LCDIF
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ */
+
+#include <common.h>
+#include <lcd.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/types.h>
+
+#include <mxc_epdc_fb.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void *lcd_base;			/* Start of framebuffer memory	*/
+void *lcd_console_address;	/* Start of console buffer	*/
+
+int lcd_color_fg;
+int lcd_color_bg;
+
+short console_col;
+short console_row;
+
+int rev;
+
+void lcd_initcolregs(void)
+{
+}
+
+void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
+{
+}
+
+#define TEMP_USE_DEFAULT 8
+
+#define UPDATE_MODE_PARTIAL			0x0
+#define UPDATE_MODE_FULL			0x1
+
+#define TRUE 1
+#define FALSE 0
+
+#define msleep(a)	udelay(a * 1000)
+
+
+/********************************************************
+ * Start Low-Level EPDC Functions
+ ********************************************************/
+
+static inline void epdc_set_screen_res(u32 width, u32 height)
+{
+	u32 val = (height << EPDC_RES_VERTICAL_OFFSET) | width;
+
+	REG_WR(EPDC_BASE, EPDC_RES, val);
+}
+
+static inline void epdc_set_update_coord(u32 x, u32 y)
+{
+	u32 val = (y << EPDC_UPD_CORD_YCORD_OFFSET) | x;
+
+	REG_WR(EPDC_BASE, EPDC_UPD_CORD, val);
+}
+
+static inline void epdc_set_update_dimensions(u32 width, u32 height)
+{
+	u32 val = (height << EPDC_UPD_SIZE_HEIGHT_OFFSET) | width;
+
+	REG_WR(EPDC_BASE, EPDC_UPD_SIZE, val);
+}
+
+static void epdc_submit_update(u32 lut_num, u32 waveform_mode, u32 update_mode,
+			       int use_test_mode, u32 np_val)
+{
+	u32 reg_val = 0;
+
+	if (use_test_mode) {
+		reg_val |=
+			((np_val << EPDC_UPD_FIXED_FIXNP_OFFSET) &
+			EPDC_UPD_FIXED_FIXNP_MASK) | EPDC_UPD_FIXED_FIXNP_EN;
+
+		REG_WR(EPDC_BASE, EPDC_UPD_FIXED, reg_val);
+
+		reg_val = EPDC_UPD_CTRL_USE_FIXED;
+	} else {
+		REG_WR(EPDC_BASE, EPDC_UPD_FIXED, reg_val);
+	}
+
+	reg_val |=
+		((lut_num << EPDC_UPD_CTRL_LUT_SEL_OFFSET) &
+		EPDC_UPD_CTRL_LUT_SEL_MASK) |
+		((waveform_mode << EPDC_UPD_CTRL_WAVEFORM_MODE_OFFSET) &
+		EPDC_UPD_CTRL_WAVEFORM_MODE_MASK) |
+		update_mode;
+
+	REG_WR(EPDC_BASE, EPDC_UPD_CTRL, reg_val);
+}
+
+static inline int epdc_is_lut_active(u32 lut_num)
+{
+	u32 val = REG_RD(EPDC_BASE, EPDC_STATUS_LUTS);
+	int is_active = val & (1 << lut_num) ? TRUE : FALSE;
+
+	return is_active;
+}
+
+static void epdc_set_horizontal_timing(u32 horiz_start, u32 horiz_end,
+				       u32 hsync_width, u32 hsync_line_length)
+{
+	u32 reg_val =
+		((hsync_width << EPDC_TCE_HSCAN1_LINE_SYNC_WIDTH_OFFSET) &
+		EPDC_TCE_HSCAN1_LINE_SYNC_WIDTH_MASK)
+		| ((hsync_line_length << EPDC_TCE_HSCAN1_LINE_SYNC_OFFSET) &
+		EPDC_TCE_HSCAN1_LINE_SYNC_MASK);
+	REG_WR(EPDC_BASE, EPDC_TCE_HSCAN1, reg_val);
+
+	reg_val =
+		((horiz_start << EPDC_TCE_HSCAN2_LINE_BEGIN_OFFSET) &
+		EPDC_TCE_HSCAN2_LINE_BEGIN_MASK)
+		| ((horiz_end << EPDC_TCE_HSCAN2_LINE_END_OFFSET) &
+		EPDC_TCE_HSCAN2_LINE_END_MASK);
+	REG_WR(EPDC_BASE, EPDC_TCE_HSCAN2, reg_val);
+}
+
+static void epdc_set_vertical_timing(u32 vert_start, u32 vert_end,
+					u32 vsync_width)
+{
+	u32 reg_val =
+		((vert_start << EPDC_TCE_VSCAN_FRAME_BEGIN_OFFSET) &
+		EPDC_TCE_VSCAN_FRAME_BEGIN_MASK)
+		| ((vert_end << EPDC_TCE_VSCAN_FRAME_END_OFFSET) &
+		EPDC_TCE_VSCAN_FRAME_END_MASK)
+		| ((vsync_width << EPDC_TCE_VSCAN_FRAME_SYNC_OFFSET) &
+		EPDC_TCE_VSCAN_FRAME_SYNC_MASK);
+	REG_WR(EPDC_BASE, EPDC_TCE_VSCAN, reg_val);
+}
+
+static void epdc_init_settings(void)
+{
+	u32 reg_val;
+	int num_ce;
+
+	/* EPDC_CTRL */
+	reg_val = REG_RD(EPDC_BASE, EPDC_CTRL);
+	reg_val &= ~EPDC_CTRL_UPD_DATA_SWIZZLE_MASK;
+	reg_val |= EPDC_CTRL_UPD_DATA_SWIZZLE_NO_SWAP;
+	reg_val &= ~EPDC_CTRL_LUT_DATA_SWIZZLE_MASK;
+	reg_val |= EPDC_CTRL_LUT_DATA_SWIZZLE_NO_SWAP;
+	REG_SET(EPDC_BASE, EPDC_CTRL, reg_val);
+
+	/* EPDC_FORMAT - 2bit TFT and 4bit Buf pixel format */
+	reg_val = EPDC_FORMAT_TFT_PIXEL_FORMAT_2BIT
+		| EPDC_FORMAT_BUF_PIXEL_FORMAT_P4N
+		| ((0x0 << EPDC_FORMAT_DEFAULT_TFT_PIXEL_OFFSET) &
+		EPDC_FORMAT_DEFAULT_TFT_PIXEL_MASK);
+	REG_WR(EPDC_BASE, EPDC_FORMAT, reg_val);
+
+	/* EPDC_FIFOCTRL (disabled) */
+	reg_val =
+		((100 << EPDC_FIFOCTRL_FIFO_INIT_LEVEL_OFFSET) &
+		EPDC_FIFOCTRL_FIFO_INIT_LEVEL_MASK)
+		| ((200 << EPDC_FIFOCTRL_FIFO_H_LEVEL_OFFSET) &
+		EPDC_FIFOCTRL_FIFO_H_LEVEL_MASK)
+		| ((100 << EPDC_FIFOCTRL_FIFO_L_LEVEL_OFFSET) &
+		EPDC_FIFOCTRL_FIFO_L_LEVEL_MASK);
+	REG_WR(EPDC_BASE, EPDC_FIFOCTRL, reg_val);
+
+	/* EPDC_TEMP - Use default temperature */
+	REG_WR(EPDC_BASE, EPDC_TEMP, TEMP_USE_DEFAULT);
+
+	/* EPDC_RES */
+	epdc_set_screen_res(panel_info.vl_col, panel_info.vl_row);
+
+	/*
+	 * EPDC_TCE_CTRL
+	 * VSCAN_HOLDOFF = 4
+	 * VCOM_MODE = MANUAL
+	 * VCOM_VAL = 0
+	 * DDR_MODE = DISABLED
+	 * LVDS_MODE_CE = DISABLED
+	 * LVDS_MODE = DISABLED
+	 * DUAL_SCAN = DISABLED
+	 * SDDO_WIDTH = 8bit
+	 * PIXELS_PER_SDCLK = 4
+	 */
+	reg_val =
+		((panel_info.epdc_data.epdc_timings.vscan_holdoff <<
+			EPDC_TCE_CTRL_VSCAN_HOLDOFF_OFFSET) &
+			EPDC_TCE_CTRL_VSCAN_HOLDOFF_MASK)
+		| EPDC_TCE_CTRL_PIXELS_PER_SDCLK_4;
+	REG_WR(EPDC_BASE, EPDC_TCE_CTRL, reg_val);
+
+	/* EPDC_TCE_HSCAN */
+	epdc_set_horizontal_timing(panel_info.vl_left_margin,
+				panel_info.vl_right_margin,
+				panel_info.vl_hsync,
+				panel_info.vl_hsync);
+
+	/* EPDC_TCE_VSCAN */
+	epdc_set_vertical_timing(panel_info.vl_upper_margin,
+				 panel_info.vl_lower_margin,
+				 panel_info.vl_vsync);
+
+	/* EPDC_TCE_OE */
+	reg_val =
+		((panel_info.epdc_data.epdc_timings.sdoed_width <<
+			EPDC_TCE_OE_SDOED_WIDTH_OFFSET) &
+			EPDC_TCE_OE_SDOED_WIDTH_MASK)
+		| ((panel_info.epdc_data.epdc_timings.sdoed_delay <<
+			EPDC_TCE_OE_SDOED_DLY_OFFSET) &
+			EPDC_TCE_OE_SDOED_DLY_MASK)
+		| ((panel_info.epdc_data.epdc_timings.sdoez_width <<
+			EPDC_TCE_OE_SDOEZ_WIDTH_OFFSET) &
+			EPDC_TCE_OE_SDOEZ_WIDTH_MASK)
+		| ((panel_info.epdc_data.epdc_timings.sdoez_delay <<
+			EPDC_TCE_OE_SDOEZ_DLY_OFFSET) &
+			EPDC_TCE_OE_SDOEZ_DLY_MASK);
+	REG_WR(EPDC_BASE, EPDC_TCE_OE, reg_val);
+
+	/* EPDC_TCE_TIMING1 */
+	REG_WR(EPDC_BASE, EPDC_TCE_TIMING1, 0x0);
+
+	/* EPDC_TCE_TIMING2 */
+	reg_val =
+		((panel_info.epdc_data.epdc_timings.gdclk_hp_offs <<
+			EPDC_TCE_TIMING2_GDCLK_HP_OFFSET) &
+			EPDC_TCE_TIMING2_GDCLK_HP_MASK)
+		| ((panel_info.epdc_data.epdc_timings.gdsp_offs <<
+			EPDC_TCE_TIMING2_GDSP_OFFSET_OFFSET) &
+			EPDC_TCE_TIMING2_GDSP_OFFSET_MASK);
+	REG_WR(EPDC_BASE, EPDC_TCE_TIMING2, reg_val);
+
+	/* EPDC_TCE_TIMING3 */
+	reg_val =
+		((panel_info.epdc_data.epdc_timings.gdoe_offs <<
+			EPDC_TCE_TIMING3_GDOE_OFFSET_OFFSET) &
+			EPDC_TCE_TIMING3_GDOE_OFFSET_MASK)
+		| ((panel_info.epdc_data.epdc_timings.gdclk_offs <<
+			EPDC_TCE_TIMING3_GDCLK_OFFSET_OFFSET) &
+			EPDC_TCE_TIMING3_GDCLK_OFFSET_MASK);
+	REG_WR(EPDC_BASE, EPDC_TCE_TIMING3, reg_val);
+
+	/*
+	 * EPDC_TCE_SDCFG
+	 * SDCLK_HOLD = 1
+	 * SDSHR = 1
+	 * NUM_CE = 1
+	 * SDDO_REFORMAT = FLIP_PIXELS
+	 * SDDO_INVERT = DISABLED
+	 * PIXELS_PER_CE = display horizontal resolution
+	 */
+	num_ce = panel_info.epdc_data.epdc_timings.num_ce;
+	if (num_ce == 0)
+		num_ce = 1;
+	reg_val = EPDC_TCE_SDCFG_SDCLK_HOLD | EPDC_TCE_SDCFG_SDSHR
+		| ((num_ce << EPDC_TCE_SDCFG_NUM_CE_OFFSET) & EPDC_TCE_SDCFG_NUM_CE_MASK)
+		| EPDC_TCE_SDCFG_SDDO_REFORMAT_FLIP_PIXELS
+		| ((panel_info.vl_col << EPDC_TCE_SDCFG_PIXELS_PER_CE_OFFSET) &
+		EPDC_TCE_SDCFG_PIXELS_PER_CE_MASK);
+	REG_WR(EPDC_BASE, EPDC_TCE_SDCFG, reg_val);
+
+	/*
+	 * EPDC_TCE_GDCFG
+	 * GDRL = 1
+	 * GDOE_MODE = 0;
+	 * GDSP_MODE = 0;
+	 */
+	reg_val = EPDC_TCE_SDCFG_GDRL;
+	REG_WR(EPDC_BASE, EPDC_TCE_GDCFG, reg_val);
+
+	/*
+	 * EPDC_TCE_POLARITY
+	 * SDCE_POL = ACTIVE LOW
+	 * SDLE_POL = ACTIVE HIGH
+	 * SDOE_POL = ACTIVE HIGH
+	 * GDOE_POL = ACTIVE HIGH
+	 * GDSP_POL = ACTIVE LOW
+	 */
+	reg_val = EPDC_TCE_POLARITY_SDLE_POL_ACTIVE_HIGH
+		| EPDC_TCE_POLARITY_SDOE_POL_ACTIVE_HIGH
+		| EPDC_TCE_POLARITY_GDOE_POL_ACTIVE_HIGH;
+	REG_WR(EPDC_BASE, EPDC_TCE_POLARITY, reg_val);
+
+	/* EPDC_IRQ_MASK */
+	REG_WR(EPDC_BASE, EPDC_IRQ_MASK,
+		EPDC_IRQ_TCE_UNDERRUN_IRQ);
+
+	/*
+	 * EPDC_GPIO
+	 * PWRCOM = ?
+	 * PWRCTRL = ?
+	 * BDR = ?
+	 */
+	reg_val = ((0 << EPDC_GPIO_PWRCTRL_OFFSET) & EPDC_GPIO_PWRCTRL_MASK)
+		| ((0 << EPDC_GPIO_BDR_OFFSET) & EPDC_GPIO_BDR_MASK);
+	REG_WR(EPDC_BASE, EPDC_GPIO, reg_val);
+}
+
+static void draw_mode0(void)
+{
+	int i;
+
+	/* Program EPDC update to process buffer */
+	epdc_set_update_coord(0, 0);
+	epdc_set_update_dimensions(panel_info.vl_col, panel_info.vl_row);
+	epdc_submit_update(0, panel_info.epdc_data.wv_modes.mode_init,
+				UPDATE_MODE_FULL, FALSE, 0);
+
+	debug("Mode0 update - Waiting for LUT to complete...\n");
+
+	/* Will timeout after ~4-5 seconds */
+
+	for (i = 0; i < 40; i++) {
+		if (!epdc_is_lut_active(0)) {
+			debug("Mode0 init complete\n");
+			return;
+		}
+		msleep(100);
+	}
+
+	debug("Mode0 init failed!\n");
+
+}
+
+static void draw_splash_screen(void)
+{
+	int i;
+	int lut_num = 0;
+
+	/* Program EPDC update to process buffer */
+	epdc_set_update_coord(0, 0);
+	epdc_set_update_dimensions(panel_info.vl_col, panel_info.vl_row);
+	epdc_submit_update(lut_num, panel_info.epdc_data.wv_modes.mode_gc16,
+		UPDATE_MODE_FULL, FALSE, 0);
+
+	for (i = 0; i < 40; i++) {
+		if (!epdc_is_lut_active(lut_num)) {
+			debug("Splash screen update complete\n");
+			return;
+		}
+		msleep(100);
+	}
+	debug("Splash screen update failed!\n");
+}
+
+void lcd_enable(void)
+{
+	int i;
+
+	epdc_power_on();
+
+	lcd_base = (void *)CONFIG_FB_BASE;
+	/* Draw black border around framebuffer*/
+	memset(lcd_base, 0xFF, panel_info.vl_col * panel_info.vl_row);
+	memset(lcd_base, 0x0, 24 * panel_info.vl_col);
+	for (i = 24; i < (panel_info.vl_row - 24); i++) {
+		memset((u8 *)lcd_base + i * panel_info.vl_col, 0x00, 24);
+		memset((u8 *)lcd_base + i * panel_info.vl_col
+			+ panel_info.vl_col - 24, 0x00, 24);
+	}
+	memset((u8 *)lcd_base + panel_info.vl_col * (panel_info.vl_row - 24),
+		0x00, 24 * panel_info.vl_col);
+
+	flush_cache((ulong)lcd_base, panel_info.vl_col * panel_info.vl_row);
+
+	/* Draw data to display */
+	draw_mode0();
+
+	draw_splash_screen();
+}
+
+void lcd_disable(void)
+{
+	debug("lcd_disable\n");
+
+	/* Disable clocks to EPDC */
+	REG_SET(EPDC_BASE, EPDC_CTRL, EPDC_CTRL_CLKGATE);
+}
+
+void lcd_panel_disable(void)
+{
+	epdc_power_off();
+}
+
+void lcd_ctrl_init(void *lcdbase)
+{
+	unsigned int val;
+
+	/*
+	 * We rely on lcdbase being a physical address, i.e., either MMU off,
+	 * or 1-to-1 mapping. Might want to add some virt2phys here.
+	 */
+	if (!lcdbase)
+		return;
+
+	lcd_color_fg = 0xFF;
+	lcd_color_bg = 0xFF;
+
+	/* Reset */
+	REG_SET(EPDC_BASE, EPDC_CTRL, EPDC_CTRL_SFTRST);
+	while (!(REG_RD(EPDC_BASE, EPDC_CTRL) & EPDC_CTRL_CLKGATE))
+		;
+	REG_CLR(EPDC_BASE, EPDC_CTRL, EPDC_CTRL_SFTRST);
+
+	/* Enable clock gating (clear to enable) */
+	REG_CLR(EPDC_BASE, EPDC_CTRL, EPDC_CTRL_CLKGATE);
+	while (REG_RD(EPDC_BASE, EPDC_CTRL) &
+	       (EPDC_CTRL_SFTRST | EPDC_CTRL_CLKGATE))
+		;
+
+	debug("resolution %dx%d, bpp %d\n", (int)panel_info.vl_col,
+		(int)panel_info.vl_row, NBITS(panel_info.vl_bpix));
+
+	/* Get EPDC version */
+	val = REG_RD(EPDC_BASE, EPDC_VERSION);
+	rev = ((val & EPDC_VERSION_MAJOR_MASK) >>
+				EPDC_VERSION_MAJOR_OFFSET) * 10
+			+ ((val & EPDC_VERSION_MINOR_MASK) >>
+				EPDC_VERSION_MINOR_OFFSET);
+
+	/* Set framebuffer pointer */
+	REG_WR(EPDC_BASE, EPDC_UPD_ADDR, (u32)lcdbase);
+
+	/* Set Working Buffer pointer */
+	REG_WR(EPDC_BASE, EPDC_WB_ADDR, panel_info.epdc_data.working_buf_addr);
+	if (rev > 20)
+		REG_WR(EPDC_BASE, EPDC_WB_ADDR_TCE, panel_info.epdc_data.working_buf_addr);
+
+	/* Get waveform data address and offset */
+	if (setup_waveform_file()) {
+		printf("Can't load waveform data!\n");
+		return;
+	}
+
+	/* Set Waveform Buffer pointer */
+	REG_WR(EPDC_BASE, EPDC_WVADDR,
+		panel_info.epdc_data.waveform_buf_addr);
+
+	/* Initialize EPDC, passing pointer to EPDC registers */
+	epdc_init_settings();
+
+	return;
+}
+
+ulong calc_fbsize(void)
+{
+	return panel_info.vl_row * panel_info.vl_col * 2 \
+		* NBITS(panel_info.vl_bpix) / 8;
+}
+