[U-Boot] [PATCH v3 1/2] at91: video: Support driver-model for the HLCD driver

Songjun Wu songjun.wu at microchip.com
Wed Mar 15 08:32:37 UTC 2017 

Add driver-model support to this driver.

Signed-off-by: Songjun Wu <songjun.wu at microchip.com>
---

Changes in v3:
- Replace lcdc_readl/lcdc_writel with real/writel
- Replace while() with wait_for_bit().
- Disable the clock if the clock is enabled and
  error occurs.

Changes in v2:
- Due to the peripheral clock driver improvement, remove
  the unneccessary clock calling.

 drivers/video/Kconfig        |   6 +
 drivers/video/atmel_hlcdfb.c | 481 ++++++++++++++++++++++++++++++++++++-------
 2 files changed, 416 insertions(+), 71 deletions(-)

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 2069576958..0f49612cd0 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -371,6 +371,12 @@ config DISPLAY
 	   The devices provide a simple interface to start up the display,
 	   read display information and enable it.
 
+config ATMEL_HLCD
+	bool "Enable ATMEL video support using HLCDC"
+	depends on DM_VIDEO
+	help
+	   HLCDC supports video output to an attached LCD panel.
+
 config VIDEO_BROADWELL_IGD
 	bool "Enable Intel Broadwell integrated graphics device"
 	depends on X86
diff --git a/drivers/video/atmel_hlcdfb.c b/drivers/video/atmel_hlcdfb.c
index 960b474b76..ef1dbccd27 100644
--- a/drivers/video/atmel_hlcdfb.c
+++ b/drivers/video/atmel_hlcdfb.c
@@ -10,13 +10,22 @@
 #include <asm/io.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/clk.h>
+#include <clk.h>
+#include <dm.h>
+#include <fdtdec.h>
 #include <lcd.h>
+#include <video.h>
+#include <wait_bit.h>
 #include <atmel_hlcdc.h>
 
 #if defined(CONFIG_LCD_LOGO)
 #include <bmp_logo.h>
 #endif
 
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifndef CONFIG_DM_VIDEO
+
 /* configurable parameters */
 #define ATMEL_LCDC_CVAL_DEFAULT		0xc8
 #define ATMEL_LCDC_DMA_BURST_LEN	8
@@ -26,19 +35,16 @@
 
 #define ATMEL_LCDC_FIFO_SIZE		512
 
-#define lcdc_readl(reg)		__raw_readl((reg))
-#define lcdc_writel(reg, val)	__raw_writel((val), (reg))
-
 /*
  * the CLUT register map as following
  * RCLUT(24 ~ 16), GCLUT(15 ~ 8), BCLUT(7 ~ 0)
  */
 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
 {
-	lcdc_writel(((red << LCDC_BASECLUT_RCLUT_Pos) & LCDC_BASECLUT_RCLUT_Msk)
-		| ((green << LCDC_BASECLUT_GCLUT_Pos) & LCDC_BASECLUT_GCLUT_Msk)
-		| ((blue << LCDC_BASECLUT_BCLUT_Pos) & LCDC_BASECLUT_BCLUT_Msk),
-		panel_info.mmio + ATMEL_LCDC_LUT(regno));
+	writel(panel_info.mmio + ATMEL_LCDC_LUT(regno),
+	       ((red << LCDC_BASECLUT_RCLUT_Pos) & LCDC_BASECLUT_RCLUT_Msk)
+	       | ((green << LCDC_BASECLUT_GCLUT_Pos) & LCDC_BASECLUT_GCLUT_Msk)
+	       | ((blue << LCDC_BASECLUT_BCLUT_Pos) & LCDC_BASECLUT_BCLUT_Msk));
 }
 
 ushort *configuration_get_cmap(void)
@@ -55,6 +61,7 @@ void lcd_ctrl_init(void *lcdbase)
 	unsigned long value;
 	struct lcd_dma_desc *desc;
 	struct atmel_hlcd_regs *regs;
+	int ret;
 
 	if (!has_lcdc())
 		return;     /* No lcdc */
@@ -62,21 +69,29 @@ void lcd_ctrl_init(void *lcdbase)
 	regs = (struct atmel_hlcd_regs *)panel_info.mmio;
 
 	/* Disable DISP signal */
-	lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_DISPDIS);
-	while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
-		udelay(1);
+	writel(LCDC_LCDDIS_DISPDIS, &regs->lcdc_lcddis);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_DISPSTS,
+			   false, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
 	/* Disable synchronization */
-	lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_SYNCDIS);
-	while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
-		udelay(1);
+	writel(LCDC_LCDDIS_SYNCDIS, &regs->lcdc_lcddis);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_LCDSTS,
+			   false, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
 	/* Disable pixel clock */
-	lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_CLKDIS);
-	while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
-		udelay(1);
+	writel(LCDC_LCDDIS_CLKDIS, &regs->lcdc_lcddis);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_CLKSTS,
+			   false, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
 	/* Disable PWM */
-	lcdc_writel(&regs->lcdc_lcddis, LCDC_LCDDIS_PWMDIS);
-	while ((lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
-		udelay(1);
+	writel(LCDC_LCDDIS_PWMDIS, &regs->lcdc_lcddis);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_PWMSTS,
+			   false, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
 
 	/* Set pixel clock */
 	value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
@@ -85,23 +100,23 @@ void lcd_ctrl_init(void *lcdbase)
 
 	if (value < 1) {
 		/* Using system clock as pixel clock */
-		lcdc_writel(&regs->lcdc_lcdcfg0,
-					LCDC_LCDCFG0_CLKDIV(0)
-					| LCDC_LCDCFG0_CGDISHCR
-					| LCDC_LCDCFG0_CGDISHEO
-					| LCDC_LCDCFG0_CGDISOVR1
-					| LCDC_LCDCFG0_CGDISBASE
-					| panel_info.vl_clk_pol
-					| LCDC_LCDCFG0_CLKSEL);
+		writel(LCDC_LCDCFG0_CLKDIV(0)
+			| LCDC_LCDCFG0_CGDISHCR
+			| LCDC_LCDCFG0_CGDISHEO
+			| LCDC_LCDCFG0_CGDISOVR1
+			| LCDC_LCDCFG0_CGDISBASE
+			| panel_info.vl_clk_pol
+			| LCDC_LCDCFG0_CLKSEL,
+			&regs->lcdc_lcdcfg0);
 
 	} else {
-		lcdc_writel(&regs->lcdc_lcdcfg0,
-				LCDC_LCDCFG0_CLKDIV(value - 2)
-				| LCDC_LCDCFG0_CGDISHCR
-				| LCDC_LCDCFG0_CGDISHEO
-				| LCDC_LCDCFG0_CGDISOVR1
-				| LCDC_LCDCFG0_CGDISBASE
-				| panel_info.vl_clk_pol);
+		writel(LCDC_LCDCFG0_CLKDIV(value - 2)
+			| LCDC_LCDCFG0_CGDISHCR
+			| LCDC_LCDCFG0_CGDISHEO
+			| LCDC_LCDCFG0_CGDISOVR1
+			| LCDC_LCDCFG0_CGDISBASE
+			| panel_info.vl_clk_pol,
+			&regs->lcdc_lcdcfg0);
 	}
 
 	/* Initialize control register 5 */
@@ -134,50 +149,50 @@ void lcd_ctrl_init(void *lcdbase)
 
 	value |= LCDC_LCDCFG5_GUARDTIME(ATMEL_LCDC_GUARD_TIME);
 	value |= (LCDC_LCDCFG5_DISPDLY | LCDC_LCDCFG5_VSPDLYS);
-	lcdc_writel(&regs->lcdc_lcdcfg5, value);
+	writel(value, &regs->lcdc_lcdcfg5);
 
 	/* Vertical & Horizontal Timing */
 	value = LCDC_LCDCFG1_VSPW(panel_info.vl_vsync_len - 1);
 	value |= LCDC_LCDCFG1_HSPW(panel_info.vl_hsync_len - 1);
-	lcdc_writel(&regs->lcdc_lcdcfg1, value);
+	writel(value, &regs->lcdc_lcdcfg1);
 
 	value = LCDC_LCDCFG2_VBPW(panel_info.vl_upper_margin);
 	value |= LCDC_LCDCFG2_VFPW(panel_info.vl_lower_margin - 1);
-	lcdc_writel(&regs->lcdc_lcdcfg2, value);
+	writel(value, &regs->lcdc_lcdcfg2);
 
 	value = LCDC_LCDCFG3_HBPW(panel_info.vl_left_margin - 1);
 	value |= LCDC_LCDCFG3_HFPW(panel_info.vl_right_margin - 1);
-	lcdc_writel(&regs->lcdc_lcdcfg3, value);
+	writel(value, &regs->lcdc_lcdcfg3);
 
 	/* Display size */
 	value = LCDC_LCDCFG4_RPF(panel_info.vl_row - 1);
 	value |= LCDC_LCDCFG4_PPL(panel_info.vl_col - 1);
-	lcdc_writel(&regs->lcdc_lcdcfg4, value);
+	writel(value, &regs->lcdc_lcdcfg4);
 
-	lcdc_writel(&regs->lcdc_basecfg0,
-			LCDC_BASECFG0_BLEN_AHB_INCR4 | LCDC_BASECFG0_DLBO);
+	writel(LCDC_BASECFG0_BLEN_AHB_INCR4 | LCDC_BASECFG0_DLBO,
+	       &regs->lcdc_basecfg0);
 
 	switch (NBITS(panel_info.vl_bpix)) {
 	case 16:
-		lcdc_writel(&regs->lcdc_basecfg1,
-			LCDC_BASECFG1_RGBMODE_16BPP_RGB_565);
+		writel(LCDC_BASECFG1_RGBMODE_16BPP_RGB_565,
+		       &regs->lcdc_basecfg1);
 		break;
 	case 32:
-		lcdc_writel(&regs->lcdc_basecfg1,
-			LCDC_BASECFG1_RGBMODE_24BPP_RGB_888);
+		writel(LCDC_BASECFG1_RGBMODE_24BPP_RGB_888,
+		       &regs->lcdc_basecfg1);
 		break;
 	default:
 		BUG();
 		break;
 	}
 
-	lcdc_writel(&regs->lcdc_basecfg2, LCDC_BASECFG2_XSTRIDE(0));
-	lcdc_writel(&regs->lcdc_basecfg3, 0);
-	lcdc_writel(&regs->lcdc_basecfg4, LCDC_BASECFG4_DMA);
+	writel(LCDC_BASECFG2_XSTRIDE(0), &regs->lcdc_basecfg2);
+	writel(0, &regs->lcdc_basecfg3);
+	writel(LCDC_BASECFG4_DMA, &regs->lcdc_basecfg4);
 
 	/* Disable all interrupts */
-	lcdc_writel(&regs->lcdc_lcdidr, ~0UL);
-	lcdc_writel(&regs->lcdc_baseidr, ~0UL);
+	writel(~0UL, &regs->lcdc_lcdidr);
+	writel(~0UL, &regs->lcdc_baseidr);
 
 	/* Setup the DMA descriptor, this descriptor will loop to itself */
 	desc = (struct lcd_dma_desc *)(lcdbase - 16);
@@ -191,30 +206,354 @@ void lcd_ctrl_init(void *lcdbase)
 	/* Flush the DMA descriptor if we enabled dcache */
 	flush_dcache_range((u32)desc, (u32)desc + sizeof(*desc));
 
-	lcdc_writel(&regs->lcdc_baseaddr, desc->address);
-	lcdc_writel(&regs->lcdc_basectrl, desc->control);
-	lcdc_writel(&regs->lcdc_basenext, desc->next);
-	lcdc_writel(&regs->lcdc_basecher, LCDC_BASECHER_CHEN |
-					  LCDC_BASECHER_UPDATEEN);
+	writel(desc->address, &regs->lcdc_baseaddr);
+	writel(desc->control, &regs->lcdc_basectrl);
+	writel(desc->next, &regs->lcdc_basenext);
+	writel(LCDC_BASECHER_CHEN | LCDC_BASECHER_UPDATEEN,
+	       &regs->lcdc_basecher);
 
 	/* Enable LCD */
-	value = lcdc_readl(&regs->lcdc_lcden);
-	lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_CLKEN);
-	while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
-		udelay(1);
-	value = lcdc_readl(&regs->lcdc_lcden);
-	lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_SYNCEN);
-	while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
-		udelay(1);
-	value = lcdc_readl(&regs->lcdc_lcden);
-	lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_DISPEN);
-	while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
-		udelay(1);
-	value = lcdc_readl(&regs->lcdc_lcden);
-	lcdc_writel(&regs->lcdc_lcden, value | LCDC_LCDEN_PWMEN);
-	while (!(lcdc_readl(&regs->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
-		udelay(1);
+	value = readl(&regs->lcdc_lcden);
+	writel(value | LCDC_LCDEN_CLKEN, &regs->lcdc_lcden);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_CLKSTS,
+			   true, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+	value = readl(&regs->lcdc_lcden);
+	writel(value | LCDC_LCDEN_SYNCEN, &regs->lcdc_lcden);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_LCDSTS,
+			   true, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+	value = readl(&regs->lcdc_lcden);
+	writel(value | LCDC_LCDEN_DISPEN, &regs->lcdc_lcden);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_DISPSTS,
+			   true, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+	value = readl(&regs->lcdc_lcden);
+	writel(value | LCDC_LCDEN_PWMEN, &regs->lcdc_lcden);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_PWMSTS,
+			   true, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
 
 	/* Enable flushing if we enabled dcache */
 	lcd_set_flush_dcache(1);
 }
+
+#else
+
+enum {
+	LCD_MAX_WIDTH		= 1024,
+	LCD_MAX_HEIGHT		= 768,
+	LCD_MAX_LOG2_BPP	= VIDEO_BPP16,
+};
+
+struct atmel_hlcdc_priv {
+	struct atmel_hlcd_regs *regs;
+	struct display_timing timing;
+	unsigned int vl_bpix;
+	unsigned int output_mode;
+	unsigned int guard_time;
+	ulong clk_rate;
+};
+
+static int at91_hlcdc_enable_clk(struct udevice *dev)
+{
+	struct atmel_hlcdc_priv *priv = dev_get_priv(dev);
+	struct clk clk;
+	ulong clk_rate;
+	int ret;
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret)
+		return -EINVAL;
+
+	ret = clk_enable(&clk);
+	if (ret)
+		return ret;
+
+	clk_rate = clk_get_rate(&clk);
+	if (!clk_rate) {
+		clk_disable(&clk);
+		return -ENODEV;
+	}
+
+	priv->clk_rate = clk_rate;
+
+	clk_free(&clk);
+
+	return 0;
+}
+
+static void atmel_hlcdc_init(struct udevice *dev)
+{
+	struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
+	struct atmel_hlcdc_priv *priv = dev_get_priv(dev);
+	struct atmel_hlcd_regs *regs = priv->regs;
+	struct display_timing *timing = &priv->timing;
+	struct lcd_dma_desc *desc;
+	unsigned long value, vl_clk_pol;
+	int ret;
+
+	/* Disable DISP signal */
+	writel(LCDC_LCDDIS_DISPDIS, &regs->lcdc_lcddis);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_DISPSTS,
+			   false, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+	/* Disable synchronization */
+	writel(LCDC_LCDDIS_SYNCDIS, &regs->lcdc_lcddis);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_LCDSTS,
+			   false, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+	/* Disable pixel clock */
+	writel(LCDC_LCDDIS_CLKDIS, &regs->lcdc_lcddis);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_CLKSTS,
+			   false, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+	/* Disable PWM */
+	writel(LCDC_LCDDIS_PWMDIS, &regs->lcdc_lcddis);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_PWMSTS,
+			   false, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+
+	/* Set pixel clock */
+	value = priv->clk_rate / timing->pixelclock.typ;
+	if (priv->clk_rate % timing->pixelclock.typ)
+		value++;
+
+	vl_clk_pol = 0;
+	if (timing->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+		vl_clk_pol = LCDC_LCDCFG0_CLKPOL;
+
+	if (value < 1) {
+		/* Using system clock as pixel clock */
+		writel(LCDC_LCDCFG0_CLKDIV(0)
+			| LCDC_LCDCFG0_CGDISHCR
+			| LCDC_LCDCFG0_CGDISHEO
+			| LCDC_LCDCFG0_CGDISOVR1
+			| LCDC_LCDCFG0_CGDISBASE
+			| vl_clk_pol
+			| LCDC_LCDCFG0_CLKSEL,
+			&regs->lcdc_lcdcfg0);
+
+	} else {
+		writel(LCDC_LCDCFG0_CLKDIV(value - 2)
+			| LCDC_LCDCFG0_CGDISHCR
+			| LCDC_LCDCFG0_CGDISHEO
+			| LCDC_LCDCFG0_CGDISOVR1
+			| LCDC_LCDCFG0_CGDISBASE
+			| vl_clk_pol,
+			&regs->lcdc_lcdcfg0);
+	}
+
+	/* Initialize control register 5 */
+	value = 0;
+
+	if (!(timing->flags & DISPLAY_FLAGS_HSYNC_HIGH))
+		value |= LCDC_LCDCFG5_HSPOL;
+	if (!(timing->flags & DISPLAY_FLAGS_VSYNC_HIGH))
+		value |= LCDC_LCDCFG5_VSPOL;
+
+	switch (priv->output_mode) {
+	case 12:
+		value |= LCDC_LCDCFG5_MODE_OUTPUT_12BPP;
+		break;
+	case 16:
+		value |= LCDC_LCDCFG5_MODE_OUTPUT_16BPP;
+		break;
+	case 18:
+		value |= LCDC_LCDCFG5_MODE_OUTPUT_18BPP;
+		break;
+	case 24:
+		value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP;
+		break;
+	default:
+		BUG();
+		break;
+	}
+
+	value |= LCDC_LCDCFG5_GUARDTIME(priv->guard_time);
+	value |= (LCDC_LCDCFG5_DISPDLY | LCDC_LCDCFG5_VSPDLYS);
+	writel(value, &regs->lcdc_lcdcfg5);
+
+	/* Vertical & Horizontal Timing */
+	value = LCDC_LCDCFG1_VSPW(timing->vsync_len.typ - 1);
+	value |= LCDC_LCDCFG1_HSPW(timing->hsync_len.typ - 1);
+	writel(value, &regs->lcdc_lcdcfg1);
+
+	value = LCDC_LCDCFG2_VBPW(timing->vback_porch.typ);
+	value |= LCDC_LCDCFG2_VFPW(timing->vfront_porch.typ - 1);
+	writel(value, &regs->lcdc_lcdcfg2);
+
+	value = LCDC_LCDCFG3_HBPW(timing->hback_porch.typ - 1);
+	value |= LCDC_LCDCFG3_HFPW(timing->hfront_porch.typ - 1);
+	writel(value, &regs->lcdc_lcdcfg3);
+
+	/* Display size */
+	value = LCDC_LCDCFG4_RPF(timing->vactive.typ - 1);
+	value |= LCDC_LCDCFG4_PPL(timing->hactive.typ - 1);
+	writel(value, &regs->lcdc_lcdcfg4);
+
+	writel(LCDC_BASECFG0_BLEN_AHB_INCR4 | LCDC_BASECFG0_DLBO,
+	       &regs->lcdc_basecfg0);
+
+	switch (VNBITS(priv->vl_bpix)) {
+	case 16:
+		writel(LCDC_BASECFG1_RGBMODE_16BPP_RGB_565,
+		       &regs->lcdc_basecfg1);
+		break;
+	case 32:
+		writel(LCDC_BASECFG1_RGBMODE_24BPP_RGB_888,
+		       &regs->lcdc_basecfg1);
+		break;
+	default:
+		BUG();
+		break;
+	}
+
+	writel(LCDC_BASECFG2_XSTRIDE(0), &regs->lcdc_basecfg2);
+	writel(0, &regs->lcdc_basecfg3);
+	writel(LCDC_BASECFG4_DMA, &regs->lcdc_basecfg4);
+
+	/* Disable all interrupts */
+	writel(~0UL, &regs->lcdc_lcdidr);
+	writel(~0UL, &regs->lcdc_baseidr);
+
+	/* Setup the DMA descriptor, this descriptor will loop to itself */
+	desc = (struct lcd_dma_desc *)(uc_plat->base - 16);
+
+	desc->address = (u32)uc_plat->base;
+
+	/* Disable DMA transfer interrupt & descriptor loaded interrupt. */
+	desc->control = LCDC_BASECTRL_ADDIEN | LCDC_BASECTRL_DSCRIEN
+			| LCDC_BASECTRL_DMAIEN | LCDC_BASECTRL_DFETCH;
+	desc->next = (u32)desc;
+
+	/* Flush the DMA descriptor if we enabled dcache */
+	flush_dcache_range((u32)desc, (u32)desc + sizeof(*desc));
+
+	writel(desc->address, &regs->lcdc_baseaddr);
+	writel(desc->control, &regs->lcdc_basectrl);
+	writel(desc->next, &regs->lcdc_basenext);
+	writel(LCDC_BASECHER_CHEN | LCDC_BASECHER_UPDATEEN,
+	       &regs->lcdc_basecher);
+
+	/* Enable LCD */
+	value = readl(&regs->lcdc_lcden);
+	writel(value | LCDC_LCDEN_CLKEN, &regs->lcdc_lcden);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_CLKSTS,
+			   true, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+	value = readl(&regs->lcdc_lcden);
+	writel(value | LCDC_LCDEN_SYNCEN, &regs->lcdc_lcden);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_LCDSTS,
+			   true, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+	value = readl(&regs->lcdc_lcden);
+	writel(value | LCDC_LCDEN_DISPEN, &regs->lcdc_lcden);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_DISPSTS,
+			   true, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+	value = readl(&regs->lcdc_lcden);
+	writel(value | LCDC_LCDEN_PWMEN, &regs->lcdc_lcden);
+	ret = wait_for_bit(__func__, &regs->lcdc_lcdsr, LCDC_LCDSR_PWMSTS,
+			   true, 1000, false);
+	if (ret)
+		printf("%s: %d: Timeout!\n", __func__, __LINE__);
+}
+
+static int atmel_hlcdc_probe(struct udevice *dev)
+{
+	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct atmel_hlcdc_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = at91_hlcdc_enable_clk(dev);
+	if (ret)
+		return ret;
+
+	atmel_hlcdc_init(dev);
+
+	uc_priv->xsize = priv->timing.hactive.typ;
+	uc_priv->ysize = priv->timing.vactive.typ;
+	uc_priv->bpix = priv->vl_bpix;
+
+	/* Enable flushing if we enabled dcache */
+	video_set_flush_dcache(dev, true);
+
+	return 0;
+}
+
+static int atmel_hlcdc_ofdata_to_platdata(struct udevice *dev)
+{
+	struct atmel_hlcdc_priv *priv = dev_get_priv(dev);
+	const void *blob = gd->fdt_blob;
+	int node = dev->of_offset;
+
+	priv->regs = (struct atmel_hlcd_regs *)dev_get_addr(dev);
+	if (!priv->regs) {
+		debug("%s: No display controller address\n", __func__);
+		return -EINVAL;
+	}
+
+	if (fdtdec_decode_display_timing(blob, dev->of_offset,
+					 0, &priv->timing)) {
+		debug("%s: Failed to decode display timing\n", __func__);
+		return -EINVAL;
+	}
+
+	if (priv->timing.hactive.typ > LCD_MAX_WIDTH)
+		priv->timing.hactive.typ = LCD_MAX_WIDTH;
+
+	if (priv->timing.vactive.typ > LCD_MAX_HEIGHT)
+		priv->timing.vactive.typ = LCD_MAX_HEIGHT;
+
+	priv->vl_bpix = fdtdec_get_int(blob, node, "atmel,vl-bpix", 0);
+	if (!priv->vl_bpix) {
+		debug("%s: Failed to get bits per pixel\n", __func__);
+		return -EINVAL;
+	}
+
+	priv->output_mode = fdtdec_get_int(blob, node, "atmel,output-mode", 24);
+	priv->guard_time = fdtdec_get_int(blob, node, "atmel,guard-time", 1);
+
+	return 0;
+}
+
+static int atmel_hlcdc_bind(struct udevice *dev)
+{
+	struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
+
+	uc_plat->size = LCD_MAX_WIDTH * LCD_MAX_HEIGHT *
+				(1 << LCD_MAX_LOG2_BPP) / 8;
+
+	debug("%s: Frame buffer size %x\n", __func__, uc_plat->size);
+
+	return 0;
+}
+
+static const struct udevice_id atmel_hlcdc_ids[] = {
+	{ .compatible = "atmel,sama5d2-hlcdc" },
+	{ }
+};
+
+U_BOOT_DRIVER(atmel_hlcdfb) = {
+	.name	= "atmel_hlcdfb",
+	.id	= UCLASS_VIDEO,
+	.of_match = atmel_hlcdc_ids,
+	.bind	= atmel_hlcdc_bind,
+	.probe	= atmel_hlcdc_probe,
+	.ofdata_to_platdata = atmel_hlcdc_ofdata_to_platdata,
+	.priv_auto_alloc_size = sizeof(struct atmel_hlcdc_priv),
+};
+
+#endif
-- 
2.11.0

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