drivers/video/fsl_dcu_fb.c - github/trini/u-boot - Gitiles

 /*
  * Copyright 2014 Freescale Semiconductor, Inc.
  *
  * FSL DCU Framebuffer driver
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <asm/io.h>
 #include <common.h>
 #include <fsl_dcu_fb.h>
 #include <linux/fb.h>
 #include <malloc.h>
 #include <video_fb.h>
 #include "videomodes.h"

 /* Convert the X,Y resolution pair into a single number */
 #define RESOLUTION(x, y) (((u32)(x) << 16) | (y))

 #ifdef CONFIG_SYS_FSL_DCU_LE
 #define	dcu_read32	in_le32
 #define	dcu_write32	out_le32
 #elif defined(CONFIG_SYS_FSL_DCU_BE)
 #define	dcu_read32	in_be32
 #define	dcu_write32	out_be32
 #endif

 #define DCU_MODE_BLEND_ITER(x)          ((x) << 20)
 #define DCU_MODE_RASTER_EN		(1 << 14)
 #define DCU_MODE_NORMAL			1
 #define DCU_MODE_COLORBAR               3
 #define DCU_BGND_R(x)			((x) << 16)
 #define DCU_BGND_G(x)			((x) << 8)
 #define DCU_BGND_B(x)			(x)
 #define DCU_DISP_SIZE_DELTA_Y(x)	((x) << 16)
 #define DCU_DISP_SIZE_DELTA_X(x)	(x)
 #define DCU_HSYN_PARA_BP(x)		((x) << 22)
 #define DCU_HSYN_PARA_PW(x)		((x) << 11)
 #define DCU_HSYN_PARA_FP(x)		(x)
 #define DCU_VSYN_PARA_BP(x)		((x) << 22)
 #define DCU_VSYN_PARA_PW(x)		((x) << 11)
 #define DCU_VSYN_PARA_FP(x)		(x)
 #define DCU_SYN_POL_INV_PXCK_FALL	(0 << 6)
 #define DCU_SYN_POL_NEG_REMAIN		(0 << 5)
 #define DCU_SYN_POL_INV_VS_LOW		(1 << 1)
 #define DCU_SYN_POL_INV_HS_LOW		(1)
 #define DCU_THRESHOLD_LS_BF_VS(x)	((x) << 16)
 #define DCU_THRESHOLD_OUT_BUF_HIGH(x)	((x) << 8)
 #define DCU_THRESHOLD_OUT_BUF_LOW(x)	(x)
 #define DCU_UPDATE_MODE_MODE            (1 << 31)
 #define DCU_UPDATE_MODE_READREG         (1 << 30)

 #define DCU_CTRLDESCLN_1_HEIGHT(x)	((x) << 16)
 #define DCU_CTRLDESCLN_1_WIDTH(x)	(x)
 #define DCU_CTRLDESCLN_2_POSY(x)	((x) << 16)
 #define DCU_CTRLDESCLN_2_POSX(x)	(x)
 #define DCU_CTRLDESCLN_4_EN		(1 << 31)
 #define DCU_CTRLDESCLN_4_TILE_EN	(1 << 30)
 #define DCU_CTRLDESCLN_4_DATA_SEL_CLUT	(1 << 29)
 #define DCU_CTRLDESCLN_4_SAFETY_EN	(1 << 28)
 #define DCU_CTRLDESCLN_4_TRANS(x)	((x) << 20)
 #define DCU_CTRLDESCLN_4_BPP(x)		((x) << 16)
 #define DCU_CTRLDESCLN_4_RLE_EN		(1 << 15)
 #define DCU_CTRLDESCLN_4_LUOFFS(x)	((x) << 4)
 #define DCU_CTRLDESCLN_4_BB_ON		(1 << 2)
 #define DCU_CTRLDESCLN_4_AB(x)		(x)
 #define DCU_CTRLDESCLN_5_CKMAX_R(x)	((x) << 16)
 #define DCU_CTRLDESCLN_5_CKMAX_G(x)	((x) << 8)
 #define DCU_CTRLDESCLN_5_CKMAX_B(x)	(x)
 #define DCU_CTRLDESCLN_6_CKMIN_R(x)	((x) << 16)
 #define DCU_CTRLDESCLN_6_CKMIN_G(x)	((x) << 8)
 #define DCU_CTRLDESCLN_6_CKMIN_B(x)	(x)
 #define DCU_CTRLDESCLN_7_TILE_VER(x)	((x) << 16)
 #define DCU_CTRLDESCLN_7_TILE_HOR(x)	(x)
 #define DCU_CTRLDESCLN_8_FG_FCOLOR(x)	(x)
 #define DCU_CTRLDESCLN_9_BG_BCOLOR(x)	(x)

 #define BPP_16_RGB565			4
 #define BPP_24_RGB888			5
 #define BPP_32_ARGB8888			6

 /*
  * This setting is used for the TWR_LCD_RGB card
  */
 static struct fb_videomode fsl_dcu_mode_480_272 = {
 	.name		= "480x272-60",
 	.refresh	= 60,
 	.xres		= 480,
 	.yres		= 272,
 	.pixclock	= 91996,
 	.left_margin	= 2,
 	.right_margin	= 2,
 	.upper_margin	= 1,
 	.lower_margin	= 1,
 	.hsync_len	= 41,
 	.vsync_len	= 2,
 	.sync		= FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 	.vmode		= FB_VMODE_NONINTERLACED
 };

 /*
  * This setting is used for Siliconimage SiI9022A HDMI
  */
 static struct fb_videomode fsl_dcu_mode_640_480 = {
 	.name		= "640x480-60",
 	.refresh	= 60,
 	.xres		= 640,
 	.yres		= 480,
 	.pixclock	= 39722,
 	.left_margin	= 48,
 	.right_margin	= 16,
 	.upper_margin	= 33,
 	.lower_margin	= 10,
 	.hsync_len	= 96,
 	.vsync_len	= 2,
 	.sync		= 0,
 	.vmode		= FB_VMODE_NONINTERLACED,
 };

 /*
  * DCU register map
  */
 struct dcu_reg {
 	u32 desc_cursor[4];
 	u32 mode;
 	u32 bgnd;
 	u32 disp_size;
 	u32 hsyn_para;
 	u32 vsyn_para;
 	u32 synpol;
 	u32 threshold;
 	u32 int_status;
 	u32 int_mask;
 	u32 colbar[8];
 	u32 div_ratio;
 	u32 sign_calc[2];
 	u32 crc_val;
 	u8 res_064[0x6c-0x64];
 	u32 parr_err_status1;
 	u8 res_070[0x7c-0x70];
 	u32 parr_err_status3;
 	u32 mparr_err_status1;
 	u8 res_084[0x90-0x84];
 	u32 mparr_err_status3;
 	u32 threshold_inp_buf[2];
 	u8 res_09c[0xa0-0x9c];
 	u32 luma_comp;
 	u32 chroma_red;
 	u32 chroma_green;
 	u32 chroma_blue;
 	u32 crc_pos;
 	u32 lyr_intpol_en;
 	u32 lyr_luma_comp;
 	u32 lyr_chrm_red;
 	u32 lyr_chrm_grn;
 	u32 lyr_chrm_blue;
 	u8 res_0c4[0xcc-0xc8];
 	u32 update_mode;
 	u32 underrun;
 	u8 res_0d4[0x100-0xd4];
 	u32 gpr;
 	u32 slr_l[2];
 	u32 slr_disp_size;
 	u32 slr_hvsync_para;
 	u32 slr_pol;
 	u32 slr_l_transp[2];
 	u8 res_120[0x200-0x120];
 	u32 ctrldescl[DCU_LAYER_MAX_NUM][16];
 };

 static struct fb_info info;

 static void reset_total_layers(void)
 {
 	struct dcu_reg *regs = (struct dcu_reg *)CONFIG_SYS_DCU_ADDR;
 	int i;

 	for (i = 0; i < DCU_LAYER_MAX_NUM; i++) {
 		dcu_write32(&regs->ctrldescl[i][0], 0);
 		dcu_write32(&regs->ctrldescl[i][1], 0);
 		dcu_write32(&regs->ctrldescl[i][2], 0);
 		dcu_write32(&regs->ctrldescl[i][3], 0);
 		dcu_write32(&regs->ctrldescl[i][4], 0);
 		dcu_write32(&regs->ctrldescl[i][5], 0);
 		dcu_write32(&regs->ctrldescl[i][6], 0);
 		dcu_write32(&regs->ctrldescl[i][7], 0);
 		dcu_write32(&regs->ctrldescl[i][8], 0);
 		dcu_write32(&regs->ctrldescl[i][9], 0);
 		dcu_write32(&regs->ctrldescl[i][10], 0);
 	}

 	dcu_write32(&regs->update_mode, DCU_UPDATE_MODE_READREG);
 }

 static int layer_ctrldesc_init(int index, u32 pixel_format)
 {
 	struct dcu_reg *regs = (struct dcu_reg *)CONFIG_SYS_DCU_ADDR;
 	unsigned int bpp = BPP_24_RGB888;

 	dcu_write32(&regs->ctrldescl[index][0],
 		    DCU_CTRLDESCLN_1_HEIGHT(info.var.yres) |
 		    DCU_CTRLDESCLN_1_WIDTH(info.var.xres));

 	dcu_write32(&regs->ctrldescl[index][1],
 		    DCU_CTRLDESCLN_2_POSY(0) |
 		    DCU_CTRLDESCLN_2_POSX(0));

 	dcu_write32(&regs->ctrldescl[index][2], (unsigned int)info.screen_base);

 	switch (pixel_format) {
 	case 16:
 		bpp = BPP_16_RGB565;
 		break;
 	case 24:
 		bpp = BPP_24_RGB888;
 		break;
 	case 32:
 		bpp = BPP_32_ARGB8888;
 		break;
 	default:
 		printf("unsupported color depth: %u\n", pixel_format);
 	}

 	dcu_write32(&regs->ctrldescl[index][3],
 		    DCU_CTRLDESCLN_4_EN |
 		    DCU_CTRLDESCLN_4_TRANS(0xff) |
 		    DCU_CTRLDESCLN_4_BPP(bpp) |
 		    DCU_CTRLDESCLN_4_AB(0));

 	dcu_write32(&regs->ctrldescl[index][4],
 		    DCU_CTRLDESCLN_5_CKMAX_R(0xff) |
 		    DCU_CTRLDESCLN_5_CKMAX_G(0xff) |
 		    DCU_CTRLDESCLN_5_CKMAX_B(0xff));
 	dcu_write32(&regs->ctrldescl[index][5],
 		    DCU_CTRLDESCLN_6_CKMIN_R(0) |
 		    DCU_CTRLDESCLN_6_CKMIN_G(0) |
 		    DCU_CTRLDESCLN_6_CKMIN_B(0));

 	dcu_write32(&regs->ctrldescl[index][6],
 		    DCU_CTRLDESCLN_7_TILE_VER(0) |
 		    DCU_CTRLDESCLN_7_TILE_HOR(0));

 	dcu_write32(&regs->ctrldescl[index][7], DCU_CTRLDESCLN_8_FG_FCOLOR(0));
 	dcu_write32(&regs->ctrldescl[index][8], DCU_CTRLDESCLN_9_BG_BCOLOR(0));

 	dcu_write32(&regs->update_mode, DCU_UPDATE_MODE_READREG);

 	return 0;
 }

 int fsl_dcu_init(unsigned int xres, unsigned int yres,
 		 unsigned int pixel_format)
 {
 	struct dcu_reg *regs = (struct dcu_reg *)CONFIG_SYS_DCU_ADDR;
 	unsigned int div, mode;

 	/* Memory allocation for framebuffer */
 	info.screen_size =
 		info.var.xres * info.var.yres * (info.var.bits_per_pixel / 8);
 	info.screen_base = (char *)memalign(ARCH_DMA_MINALIGN,
 			roundup(info.screen_size, ARCH_DMA_MINALIGN));
 	memset(info.screen_base, 0, info.screen_size);

 	reset_total_layers();
 	div = dcu_set_pixel_clock(info.var.pixclock);
 	dcu_write32(&regs->div_ratio, (div - 1));

 	dcu_write32(&regs->disp_size,
 		    DCU_DISP_SIZE_DELTA_Y(info.var.yres) |
 		    DCU_DISP_SIZE_DELTA_X(info.var.xres / 16));

 	dcu_write32(&regs->hsyn_para,
 		    DCU_HSYN_PARA_BP(info.var.left_margin) |
 		    DCU_HSYN_PARA_PW(info.var.hsync_len) |
 		    DCU_HSYN_PARA_FP(info.var.right_margin));

 	dcu_write32(&regs->vsyn_para,
 		    DCU_VSYN_PARA_BP(info.var.upper_margin) |
 		    DCU_VSYN_PARA_PW(info.var.vsync_len) |
 		    DCU_VSYN_PARA_FP(info.var.lower_margin));

 	dcu_write32(&regs->synpol,
 		    DCU_SYN_POL_INV_PXCK_FALL |
 		    DCU_SYN_POL_NEG_REMAIN |
 		    DCU_SYN_POL_INV_VS_LOW |
 		    DCU_SYN_POL_INV_HS_LOW);

 	dcu_write32(&regs->bgnd,
 		    DCU_BGND_R(0) | DCU_BGND_G(0) | DCU_BGND_B(0));

 	dcu_write32(&regs->mode,
 		    DCU_MODE_BLEND_ITER(DCU_LAYER_MAX_NUM) |
 		    DCU_MODE_RASTER_EN);

 	dcu_write32(&regs->threshold,
 		    DCU_THRESHOLD_LS_BF_VS(0x3) |
 		    DCU_THRESHOLD_OUT_BUF_HIGH(0x78) |
 		    DCU_THRESHOLD_OUT_BUF_LOW(0));

 	mode = dcu_read32(&regs->mode);
 	dcu_write32(&regs->mode, mode | DCU_MODE_NORMAL);

 	layer_ctrldesc_init(0, pixel_format);

 	return 0;
 }

 void *video_hw_init(void)
 {
 	static GraphicDevice ctfb;
 	const char *options;
 	unsigned int depth = 0, freq = 0;
 	struct fb_videomode *fsl_dcu_mode_db = &fsl_dcu_mode_480_272;

 	if (!video_get_video_mode(&ctfb.winSizeX, &ctfb.winSizeY, &depth, &freq,
 				  &options))
 		return NULL;

 	/* Find the monitor port, which is a required option */
 	if (!options)
 		return NULL;
 	if (strncmp(options, "monitor=", 8) != 0)
 		return NULL;

 	switch (RESOLUTION(ctfb.winSizeX, ctfb.winSizeY)) {
 	case RESOLUTION(480, 272):
 		fsl_dcu_mode_db = &fsl_dcu_mode_480_272;
 		break;
 	case RESOLUTION(640, 480):
 		fsl_dcu_mode_db = &fsl_dcu_mode_640_480;
 		break;
 	default:
 		printf("unsupported resolution %ux%u\n",
 		       ctfb.winSizeX, ctfb.winSizeY);
 	}

 	info.var.xres = fsl_dcu_mode_db->xres;
 	info.var.yres = fsl_dcu_mode_db->yres;
 	info.var.bits_per_pixel = 32;
 	info.var.pixclock = fsl_dcu_mode_db->pixclock;
 	info.var.left_margin = fsl_dcu_mode_db->left_margin;
 	info.var.right_margin = fsl_dcu_mode_db->right_margin;
 	info.var.upper_margin = fsl_dcu_mode_db->upper_margin;
 	info.var.lower_margin = fsl_dcu_mode_db->lower_margin;
 	info.var.hsync_len = fsl_dcu_mode_db->hsync_len;
 	info.var.vsync_len = fsl_dcu_mode_db->vsync_len;
 	info.var.sync = fsl_dcu_mode_db->sync;
 	info.var.vmode = fsl_dcu_mode_db->vmode;
 	info.fix.line_length = info.var.xres * info.var.bits_per_pixel / 8;

 	if (platform_dcu_init(ctfb.winSizeX, ctfb.winSizeY,
 			      options + 8, fsl_dcu_mode_db) < 0)
 		return NULL;

 	ctfb.frameAdrs = (unsigned int)info.screen_base;
 	ctfb.plnSizeX = ctfb.winSizeX;
 	ctfb.plnSizeY = ctfb.winSizeY;

 	ctfb.gdfBytesPP = 4;
 	ctfb.gdfIndex = GDF_32BIT_X888RGB;

 	ctfb.memSize = info.screen_size;

 	return &ctfb;
 }
	/*
	* Copyright 2014 Freescale Semiconductor, Inc.
	*
	* FSL DCU Framebuffer driver
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <asm/io.h>
	#include <common.h>
	#include <fsl_dcu_fb.h>
	#include <linux/fb.h>
	#include <malloc.h>
	#include <video_fb.h>
	#include "videomodes.h"

	/* Convert the X,Y resolution pair into a single number */
	#define RESOLUTION(x, y) (((u32)(x) << 16) \| (y))

	#ifdef CONFIG_SYS_FSL_DCU_LE
	#define dcu_read32 in_le32
	#define dcu_write32 out_le32
	#elif defined(CONFIG_SYS_FSL_DCU_BE)
	#define dcu_read32 in_be32
	#define dcu_write32 out_be32
	#endif

	#define DCU_MODE_BLEND_ITER(x) ((x) << 20)
	#define DCU_MODE_RASTER_EN (1 << 14)
	#define DCU_MODE_NORMAL 1
	#define DCU_MODE_COLORBAR 3
	#define DCU_BGND_R(x) ((x) << 16)
	#define DCU_BGND_G(x) ((x) << 8)
	#define DCU_BGND_B(x) (x)
	#define DCU_DISP_SIZE_DELTA_Y(x) ((x) << 16)
	#define DCU_DISP_SIZE_DELTA_X(x) (x)
	#define DCU_HSYN_PARA_BP(x) ((x) << 22)
	#define DCU_HSYN_PARA_PW(x) ((x) << 11)
	#define DCU_HSYN_PARA_FP(x) (x)
	#define DCU_VSYN_PARA_BP(x) ((x) << 22)
	#define DCU_VSYN_PARA_PW(x) ((x) << 11)
	#define DCU_VSYN_PARA_FP(x) (x)
	#define DCU_SYN_POL_INV_PXCK_FALL (0 << 6)
	#define DCU_SYN_POL_NEG_REMAIN (0 << 5)
	#define DCU_SYN_POL_INV_VS_LOW (1 << 1)
	#define DCU_SYN_POL_INV_HS_LOW (1)
	#define DCU_THRESHOLD_LS_BF_VS(x) ((x) << 16)
	#define DCU_THRESHOLD_OUT_BUF_HIGH(x) ((x) << 8)
	#define DCU_THRESHOLD_OUT_BUF_LOW(x) (x)
	#define DCU_UPDATE_MODE_MODE (1 << 31)
	#define DCU_UPDATE_MODE_READREG (1 << 30)

	#define DCU_CTRLDESCLN_1_HEIGHT(x) ((x) << 16)
	#define DCU_CTRLDESCLN_1_WIDTH(x) (x)
	#define DCU_CTRLDESCLN_2_POSY(x) ((x) << 16)
	#define DCU_CTRLDESCLN_2_POSX(x) (x)
	#define DCU_CTRLDESCLN_4_EN (1 << 31)
	#define DCU_CTRLDESCLN_4_TILE_EN (1 << 30)
	#define DCU_CTRLDESCLN_4_DATA_SEL_CLUT (1 << 29)
	#define DCU_CTRLDESCLN_4_SAFETY_EN (1 << 28)
	#define DCU_CTRLDESCLN_4_TRANS(x) ((x) << 20)
	#define DCU_CTRLDESCLN_4_BPP(x) ((x) << 16)
	#define DCU_CTRLDESCLN_4_RLE_EN (1 << 15)
	#define DCU_CTRLDESCLN_4_LUOFFS(x) ((x) << 4)
	#define DCU_CTRLDESCLN_4_BB_ON (1 << 2)
	#define DCU_CTRLDESCLN_4_AB(x) (x)
	#define DCU_CTRLDESCLN_5_CKMAX_R(x) ((x) << 16)
	#define DCU_CTRLDESCLN_5_CKMAX_G(x) ((x) << 8)
	#define DCU_CTRLDESCLN_5_CKMAX_B(x) (x)
	#define DCU_CTRLDESCLN_6_CKMIN_R(x) ((x) << 16)
	#define DCU_CTRLDESCLN_6_CKMIN_G(x) ((x) << 8)
	#define DCU_CTRLDESCLN_6_CKMIN_B(x) (x)
	#define DCU_CTRLDESCLN_7_TILE_VER(x) ((x) << 16)
	#define DCU_CTRLDESCLN_7_TILE_HOR(x) (x)
	#define DCU_CTRLDESCLN_8_FG_FCOLOR(x) (x)
	#define DCU_CTRLDESCLN_9_BG_BCOLOR(x) (x)

	#define BPP_16_RGB565 4
	#define BPP_24_RGB888 5
	#define BPP_32_ARGB8888 6

	/*
	* This setting is used for the TWR_LCD_RGB card
	*/
	static struct fb_videomode fsl_dcu_mode_480_272 = {
	.name = "480x272-60",
	.refresh = 60,
	.xres = 480,
	.yres = 272,
	.pixclock = 91996,
	.left_margin = 2,
	.right_margin = 2,
	.upper_margin = 1,
	.lower_margin = 1,
	.hsync_len = 41,
	.vsync_len = 2,
	.sync = FB_SYNC_COMP_HIGH_ACT \| FB_SYNC_VERT_HIGH_ACT,
	.vmode = FB_VMODE_NONINTERLACED
	};

	/*
	* This setting is used for Siliconimage SiI9022A HDMI
	*/
	static struct fb_videomode fsl_dcu_mode_640_480 = {
	.name = "640x480-60",
	.refresh = 60,
	.xres = 640,
	.yres = 480,
	.pixclock = 39722,
	.left_margin = 48,
	.right_margin = 16,
	.upper_margin = 33,
	.lower_margin = 10,
	.hsync_len = 96,
	.vsync_len = 2,
	.sync = 0,
	.vmode = FB_VMODE_NONINTERLACED,
	};

	/*
	* DCU register map
	*/
	struct dcu_reg {
	u32 desc_cursor[4];
	u32 mode;
	u32 bgnd;
	u32 disp_size;
	u32 hsyn_para;
	u32 vsyn_para;
	u32 synpol;
	u32 threshold;
	u32 int_status;
	u32 int_mask;
	u32 colbar[8];
	u32 div_ratio;
	u32 sign_calc[2];
	u32 crc_val;
	u8 res_064[0x6c-0x64];
	u32 parr_err_status1;
	u8 res_070[0x7c-0x70];
	u32 parr_err_status3;
	u32 mparr_err_status1;
	u8 res_084[0x90-0x84];
	u32 mparr_err_status3;
	u32 threshold_inp_buf[2];
	u8 res_09c[0xa0-0x9c];
	u32 luma_comp;
	u32 chroma_red;
	u32 chroma_green;
	u32 chroma_blue;
	u32 crc_pos;
	u32 lyr_intpol_en;
	u32 lyr_luma_comp;
	u32 lyr_chrm_red;
	u32 lyr_chrm_grn;
	u32 lyr_chrm_blue;
	u8 res_0c4[0xcc-0xc8];
	u32 update_mode;
	u32 underrun;
	u8 res_0d4[0x100-0xd4];
	u32 gpr;
	u32 slr_l[2];
	u32 slr_disp_size;
	u32 slr_hvsync_para;
	u32 slr_pol;
	u32 slr_l_transp[2];
	u8 res_120[0x200-0x120];
	u32 ctrldescl[DCU_LAYER_MAX_NUM][16];
	};

	static struct fb_info info;

	static void reset_total_layers(void)
	{
	struct dcu_reg regs = (struct dcu_reg )CONFIG_SYS_DCU_ADDR;
	int i;

	for (i = 0; i < DCU_LAYER_MAX_NUM; i++) {
	dcu_write32(&regs->ctrldescl[i][0], 0);
	dcu_write32(&regs->ctrldescl[i][1], 0);
	dcu_write32(&regs->ctrldescl[i][2], 0);
	dcu_write32(&regs->ctrldescl[i][3], 0);
	dcu_write32(&regs->ctrldescl[i][4], 0);
	dcu_write32(&regs->ctrldescl[i][5], 0);
	dcu_write32(&regs->ctrldescl[i][6], 0);
	dcu_write32(&regs->ctrldescl[i][7], 0);
	dcu_write32(&regs->ctrldescl[i][8], 0);
	dcu_write32(&regs->ctrldescl[i][9], 0);
	dcu_write32(&regs->ctrldescl[i][10], 0);
	}

	dcu_write32(&regs->update_mode, DCU_UPDATE_MODE_READREG);
	}

	static int layer_ctrldesc_init(int index, u32 pixel_format)
	{
	struct dcu_reg regs = (struct dcu_reg )CONFIG_SYS_DCU_ADDR;
	unsigned int bpp = BPP_24_RGB888;

	dcu_write32(&regs->ctrldescl[index][0],
	DCU_CTRLDESCLN_1_HEIGHT(info.var.yres) \|
	DCU_CTRLDESCLN_1_WIDTH(info.var.xres));

	dcu_write32(&regs->ctrldescl[index][1],
	DCU_CTRLDESCLN_2_POSY(0) \|
	DCU_CTRLDESCLN_2_POSX(0));

	dcu_write32(&regs->ctrldescl[index][2], (unsigned int)info.screen_base);

	switch (pixel_format) {
	case 16:
	bpp = BPP_16_RGB565;
	break;
	case 24:
	bpp = BPP_24_RGB888;
	break;
	case 32:
	bpp = BPP_32_ARGB8888;
	break;
	default:
	printf("unsupported color depth: %u\n", pixel_format);
	}

	dcu_write32(&regs->ctrldescl[index][3],
	DCU_CTRLDESCLN_4_EN \|
	DCU_CTRLDESCLN_4_TRANS(0xff) \|
	DCU_CTRLDESCLN_4_BPP(bpp) \|
	DCU_CTRLDESCLN_4_AB(0));

	dcu_write32(&regs->ctrldescl[index][4],
	DCU_CTRLDESCLN_5_CKMAX_R(0xff) \|
	DCU_CTRLDESCLN_5_CKMAX_G(0xff) \|
	DCU_CTRLDESCLN_5_CKMAX_B(0xff));
	dcu_write32(&regs->ctrldescl[index][5],
	DCU_CTRLDESCLN_6_CKMIN_R(0) \|
	DCU_CTRLDESCLN_6_CKMIN_G(0) \|
	DCU_CTRLDESCLN_6_CKMIN_B(0));

	dcu_write32(&regs->ctrldescl[index][6],
	DCU_CTRLDESCLN_7_TILE_VER(0) \|
	DCU_CTRLDESCLN_7_TILE_HOR(0));

	dcu_write32(&regs->ctrldescl[index][7], DCU_CTRLDESCLN_8_FG_FCOLOR(0));
	dcu_write32(&regs->ctrldescl[index][8], DCU_CTRLDESCLN_9_BG_BCOLOR(0));

	dcu_write32(&regs->update_mode, DCU_UPDATE_MODE_READREG);

	return 0;
	}

	int fsl_dcu_init(unsigned int xres, unsigned int yres,
	unsigned int pixel_format)
	{
	struct dcu_reg regs = (struct dcu_reg )CONFIG_SYS_DCU_ADDR;
	unsigned int div, mode;

	/* Memory allocation for framebuffer */
	info.screen_size =
	info.var.xres * info.var.yres * (info.var.bits_per_pixel / 8);
	info.screen_base = (char *)memalign(ARCH_DMA_MINALIGN,
	roundup(info.screen_size, ARCH_DMA_MINALIGN));
	memset(info.screen_base, 0, info.screen_size);

	reset_total_layers();
	div = dcu_set_pixel_clock(info.var.pixclock);
	dcu_write32(&regs->div_ratio, (div - 1));

	dcu_write32(&regs->disp_size,
	DCU_DISP_SIZE_DELTA_Y(info.var.yres) \|
	DCU_DISP_SIZE_DELTA_X(info.var.xres / 16));

	dcu_write32(&regs->hsyn_para,
	DCU_HSYN_PARA_BP(info.var.left_margin) \|
	DCU_HSYN_PARA_PW(info.var.hsync_len) \|
	DCU_HSYN_PARA_FP(info.var.right_margin));

	dcu_write32(&regs->vsyn_para,
	DCU_VSYN_PARA_BP(info.var.upper_margin) \|
	DCU_VSYN_PARA_PW(info.var.vsync_len) \|
	DCU_VSYN_PARA_FP(info.var.lower_margin));

	dcu_write32(&regs->synpol,
	DCU_SYN_POL_INV_PXCK_FALL \|
	DCU_SYN_POL_NEG_REMAIN \|
	DCU_SYN_POL_INV_VS_LOW \|
	DCU_SYN_POL_INV_HS_LOW);

	dcu_write32(&regs->bgnd,
	DCU_BGND_R(0) \| DCU_BGND_G(0) \| DCU_BGND_B(0));

	dcu_write32(&regs->mode,
	DCU_MODE_BLEND_ITER(DCU_LAYER_MAX_NUM) \|
	DCU_MODE_RASTER_EN);

	dcu_write32(&regs->threshold,
	DCU_THRESHOLD_LS_BF_VS(0x3) \|
	DCU_THRESHOLD_OUT_BUF_HIGH(0x78) \|
	DCU_THRESHOLD_OUT_BUF_LOW(0));

	mode = dcu_read32(&regs->mode);
	dcu_write32(&regs->mode, mode \| DCU_MODE_NORMAL);

	layer_ctrldesc_init(0, pixel_format);

	return 0;
	}

	void *video_hw_init(void)
	{
	static GraphicDevice ctfb;
	const char *options;
	unsigned int depth = 0, freq = 0;
	struct fb_videomode *fsl_dcu_mode_db = &fsl_dcu_mode_480_272;

	if (!video_get_video_mode(&ctfb.winSizeX, &ctfb.winSizeY, &depth, &freq,
	&options))
	return NULL;

	/* Find the monitor port, which is a required option */
	if (!options)
	return NULL;
	if (strncmp(options, "monitor=", 8) != 0)
	return NULL;

	switch (RESOLUTION(ctfb.winSizeX, ctfb.winSizeY)) {
	case RESOLUTION(480, 272):
	fsl_dcu_mode_db = &fsl_dcu_mode_480_272;
	break;
	case RESOLUTION(640, 480):
	fsl_dcu_mode_db = &fsl_dcu_mode_640_480;
	break;
	default:
	printf("unsupported resolution %ux%u\n",
	ctfb.winSizeX, ctfb.winSizeY);
	}

	info.var.xres = fsl_dcu_mode_db->xres;
	info.var.yres = fsl_dcu_mode_db->yres;
	info.var.bits_per_pixel = 32;
	info.var.pixclock = fsl_dcu_mode_db->pixclock;
	info.var.left_margin = fsl_dcu_mode_db->left_margin;
	info.var.right_margin = fsl_dcu_mode_db->right_margin;
	info.var.upper_margin = fsl_dcu_mode_db->upper_margin;
	info.var.lower_margin = fsl_dcu_mode_db->lower_margin;
	info.var.hsync_len = fsl_dcu_mode_db->hsync_len;
	info.var.vsync_len = fsl_dcu_mode_db->vsync_len;
	info.var.sync = fsl_dcu_mode_db->sync;
	info.var.vmode = fsl_dcu_mode_db->vmode;
	info.fix.line_length = info.var.xres * info.var.bits_per_pixel / 8;

	if (platform_dcu_init(ctfb.winSizeX, ctfb.winSizeY,
	options + 8, fsl_dcu_mode_db) < 0)
	return NULL;

	ctfb.frameAdrs = (unsigned int)info.screen_base;
	ctfb.plnSizeX = ctfb.winSizeX;
	ctfb.plnSizeY = ctfb.winSizeY;

	ctfb.gdfBytesPP = 4;
	ctfb.gdfIndex = GDF_32BIT_X888RGB;

	ctfb.memSize = info.screen_size;

	return &ctfb;
	}