drivers/video/video-uclass.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (c) 2015 Google, Inc
  */

 #define LOG_CATEGORY UCLASS_VIDEO

 #include <common.h>
 #include <console.h>
 #include <cpu_func.h>
 #include <dm.h>
 #include <log.h>
 #include <malloc.h>
 #include <mapmem.h>
 #include <stdio_dev.h>
 #include <video.h>
 #include <video_console.h>
 #include <asm/cache.h>
 #include <asm/global_data.h>
 #include <dm/lists.h>
 #include <dm/device_compat.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>
 #ifdef CONFIG_SANDBOX
 #include <asm/sdl.h>
 #endif

 /*
  * Theory of operation:
  *
  * Before relocation each device is bound. The driver for each device must
  * set the @align and @size values in struct video_uc_plat. This
  * information represents the requires size and alignment of the frame buffer
  * for the device. The values can be an over-estimate but cannot be too
  * small. The actual values will be suppled (in the same manner) by the bind()
  * method after relocation.
  *
  * This information is then picked up by video_reserve() which works out how
  * much memory is needed for all devices. This is allocated between
  * gd->video_bottom and gd->video_top.
  *
  * After relocation the same process occurs. The driver supplies the same
  * @size and @align information and this time video_post_bind() checks that
  * the drivers does not overflow the allocated memory.
  *
  * The frame buffer address is actually set (to plat->base) in
  * video_post_probe(). This function also clears the frame buffer and
  * allocates a suitable text console device. This can then be used to write
  * text to the video device.
  */
 DECLARE_GLOBAL_DATA_PTR;

 /**
  * struct video_uc_priv - Information for the video uclass
  *
  * @video_ptr: Current allocation position of the video framebuffer pointer.
  *	While binding devices after relocation, this points to the next
  *	available address to use for a device's framebuffer. It starts at
  *	gd->video_top and works downwards, running out of space when it hits
  *	gd->video_bottom.
  */
 struct video_uc_priv {
 	ulong video_ptr;
 };

 void video_set_flush_dcache(struct udevice *dev, bool flush)
 {
 	struct video_priv *priv = dev_get_uclass_priv(dev);

 	priv->flush_dcache = flush;
 }

 static ulong alloc_fb(struct udevice *dev, ulong *addrp)
 {
 	struct video_uc_plat *plat = dev_get_uclass_plat(dev);
 	ulong base, align, size;

 	if (!plat->size)
 		return 0;

 	align = plat->align ? plat->align : 1 << 20;
 	base = *addrp - plat->size;
 	base &= ~(align - 1);
 	plat->base = base;
 	size = *addrp - base;
 	*addrp = base;

 	return size;
 }

 int video_reserve(ulong *addrp)
 {
 	struct udevice *dev;
 	ulong size;

 	gd->video_top = *addrp;
 	for (uclass_find_first_device(UCLASS_VIDEO, &dev);
 	     dev;
 	     uclass_find_next_device(&dev)) {
 		size = alloc_fb(dev, addrp);
 		debug("%s: Reserving %lx bytes at %lx for video device '%s'\n",
 		      __func__, size, *addrp, dev->name);
 	}

 	/* Allocate space for PCI video devices in case there were not bound */
 	if (*addrp == gd->video_top)
 		*addrp -= CONFIG_VIDEO_PCI_DEFAULT_FB_SIZE;

 	gd->video_bottom = *addrp;
 	gd->fb_base = *addrp;
 	debug("Video frame buffers from %lx to %lx\n", gd->video_bottom,
 	      gd->video_top);

 	return 0;
 }

 int video_clear(struct udevice *dev)
 {
 	struct video_priv *priv = dev_get_uclass_priv(dev);
 	int ret;

 	switch (priv->bpix) {
 	case VIDEO_BPP16:
 		if (IS_ENABLED(CONFIG_VIDEO_BPP16)) {
 			u16 *ppix = priv->fb;
 			u16 *end = priv->fb + priv->fb_size;

 			while (ppix < end)
 				*ppix++ = priv->colour_bg;
 			break;
 		}
 	case VIDEO_BPP32:
 		if (IS_ENABLED(CONFIG_VIDEO_BPP32)) {
 			u32 *ppix = priv->fb;
 			u32 *end = priv->fb + priv->fb_size;

 			while (ppix < end)
 				*ppix++ = priv->colour_bg;
 			break;
 		}
 	default:
 		memset(priv->fb, priv->colour_bg, priv->fb_size);
 		break;
 	}
 	ret = video_sync_copy(dev, priv->fb, priv->fb + priv->fb_size);
 	if (ret)
 		return ret;

 	return video_sync(dev, false);
 }

 void video_set_default_colors(struct udevice *dev, bool invert)
 {
 	struct video_priv *priv = dev_get_uclass_priv(dev);
 	int fore, back;

 	if (CONFIG_IS_ENABLED(SYS_WHITE_ON_BLACK)) {
 		/* White is used when switching to bold, use light gray here */
 		fore = VID_LIGHT_GRAY;
 		back = VID_BLACK;
 	} else {
 		fore = VID_BLACK;
 		back = VID_WHITE;
 	}
 	if (invert) {
 		int temp;

 		temp = fore;
 		fore = back;
 		back = temp;
 	}
 	priv->fg_col_idx = fore;
 	priv->bg_col_idx = back;
 	priv->colour_fg = vid_console_color(priv, fore);
 	priv->colour_bg = vid_console_color(priv, back);
 }

 /* Flush video activity to the caches */
 int video_sync(struct udevice *vid, bool force)
 {
 	struct video_ops *ops = video_get_ops(vid);
 	int ret;

 	if (ops && ops->video_sync) {
 		ret = ops->video_sync(vid);
 		if (ret)
 			return ret;
 	}

 	/*
 	 * flush_dcache_range() is declared in common.h but it seems that some
 	 * architectures do not actually implement it. Is there a way to find
 	 * out whether it exists? For now, ARM is safe.
 	 */
 #if defined(CONFIG_ARM) && !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
 	struct video_priv *priv = dev_get_uclass_priv(vid);

 	if (priv->flush_dcache) {
 		flush_dcache_range((ulong)priv->fb,
 				   ALIGN((ulong)priv->fb + priv->fb_size,
 					 CONFIG_SYS_CACHELINE_SIZE));
 	}
 #elif defined(CONFIG_VIDEO_SANDBOX_SDL)
 	struct video_priv *priv = dev_get_uclass_priv(vid);
 	static ulong last_sync;

 	if (force || get_timer(last_sync) > 10) {
 		sandbox_sdl_sync(priv->fb);
 		last_sync = get_timer(0);
 	}
 #endif
 	return 0;
 }

 void video_sync_all(void)
 {
 	struct udevice *dev;
 	int ret;

 	for (uclass_find_first_device(UCLASS_VIDEO, &dev);
 	     dev;
 	     uclass_find_next_device(&dev)) {
 		if (device_active(dev)) {
 			ret = video_sync(dev, true);
 			if (ret)
 				dev_dbg(dev, "Video sync failed\n");
 		}
 	}
 }

 bool video_is_active(void)
 {
 	struct udevice *dev;

 	for (uclass_find_first_device(UCLASS_VIDEO, &dev);
 	     dev;
 	     uclass_find_next_device(&dev)) {
 		if (device_active(dev))
 			return true;
 	}

 	return false;
 }

 int video_get_xsize(struct udevice *dev)
 {
 	struct video_priv *priv = dev_get_uclass_priv(dev);

 	return priv->xsize;
 }

 int video_get_ysize(struct udevice *dev)
 {
 	struct video_priv *priv = dev_get_uclass_priv(dev);

 	return priv->ysize;
 }

 #ifdef CONFIG_VIDEO_COPY
 int video_sync_copy(struct udevice *dev, void *from, void *to)
 {
 	struct video_priv *priv = dev_get_uclass_priv(dev);

 	if (priv->copy_fb) {
 		long offset, size;

 		/* Find the offset of the first byte to copy */
 		if ((ulong)to > (ulong)from) {
 			size = to - from;
 			offset = from - priv->fb;
 		} else {
 			size = from - to;
 			offset = to - priv->fb;
 		}

 		/*
 		 * Allow a bit of leeway for valid requests somewhere near the
 		 * frame buffer
 		 */
 		if (offset < -priv->fb_size || offset > 2 * priv->fb_size) {
 #ifdef DEBUG
 			char str[120];

 			snprintf(str, sizeof(str),
 				 "[** FAULT sync_copy fb=%p, from=%p, to=%p, offset=%lx]",
 				 priv->fb, from, to, offset);
 			console_puts_select_stderr(true, str);
 #endif
 			return -EFAULT;
 		}

 		/*
 		 * Silently crop the memcpy. This allows callers to avoid doing
 		 * this themselves. It is common for the end pointer to go a
 		 * few lines after the end of the frame buffer, since most of
 		 * the update algorithms terminate a line after their last write
 		 */
 		if (offset + size > priv->fb_size) {
 			size = priv->fb_size - offset;
 		} else if (offset < 0) {
 			size += offset;
 			offset = 0;
 		}

 		memcpy(priv->copy_fb + offset, priv->fb + offset, size);
 	}

 	return 0;
 }

 int video_sync_copy_all(struct udevice *dev)
 {
 	struct video_priv *priv = dev_get_uclass_priv(dev);

 	video_sync_copy(dev, priv->fb, priv->fb + priv->fb_size);

 	return 0;
 }

 #endif

 #define SPLASH_DECL(_name) \
 	extern u8 __splash_ ## _name ## _begin[]; \
 	extern u8 __splash_ ## _name ## _end[]

 #define SPLASH_START(_name)	__splash_ ## _name ## _begin

 SPLASH_DECL(u_boot_logo);

 static int show_splash(struct udevice *dev)
 {
 	u8 *data = SPLASH_START(u_boot_logo);
 	int ret;

 	ret = video_bmp_display(dev, map_to_sysmem(data), -4, 4, true);

 	return 0;
 }

 /* Set up the display ready for use */
 static int video_post_probe(struct udevice *dev)
 {
 	struct video_uc_plat *plat = dev_get_uclass_plat(dev);
 	struct video_priv *priv = dev_get_uclass_priv(dev);
 	char name[30], drv[15], *str;
 	const char *drv_name = drv;
 	struct udevice *cons;
 	int ret;

 	/* Set up the line and display size */
 	priv->fb = map_sysmem(plat->base, plat->size);
 	if (!priv->line_length)
 		priv->line_length = priv->xsize * VNBYTES(priv->bpix);

 	priv->fb_size = priv->line_length * priv->ysize;

 	if (IS_ENABLED(CONFIG_VIDEO_COPY) && plat->copy_base)
 		priv->copy_fb = map_sysmem(plat->copy_base, plat->size);

 	/* Set up colors  */
 	video_set_default_colors(dev, false);

 	if (!CONFIG_IS_ENABLED(NO_FB_CLEAR))
 		video_clear(dev);

 	/*
 	 * Create a text console device. For now we always do this, although
 	 * it might be useful to support only bitmap drawing on the device
 	 * for boards that don't need to display text. We create a TrueType
 	 * console if enabled, a rotated console if the video driver requests
 	 * it, otherwise a normal console.
 	 *
 	 * The console can be override by setting vidconsole_drv_name before
 	 * probing this video driver, or in the probe() method.
 	 *
 	 * TrueType does not support rotation at present so fall back to the
 	 * rotated console in that case.
 	 */
 	if (!priv->rot && IS_ENABLED(CONFIG_CONSOLE_TRUETYPE)) {
 		snprintf(name, sizeof(name), "%s.vidconsole_tt", dev->name);
 		strcpy(drv, "vidconsole_tt");
 	} else {
 		snprintf(name, sizeof(name), "%s.vidconsole%d", dev->name,
 			 priv->rot);
 		snprintf(drv, sizeof(drv), "vidconsole%d", priv->rot);
 	}

 	str = strdup(name);
 	if (!str)
 		return -ENOMEM;
 	if (priv->vidconsole_drv_name)
 		drv_name = priv->vidconsole_drv_name;
 	ret = device_bind_driver(dev, drv_name, str, &cons);
 	if (ret) {
 		debug("%s: Cannot bind console driver\n", __func__);
 		return ret;
 	}

 	ret = device_probe(cons);
 	if (ret) {
 		debug("%s: Cannot probe console driver\n", __func__);
 		return ret;
 	}

 	if (IS_ENABLED(CONFIG_VIDEO_LOGO) && !plat->hide_logo) {
 		ret = show_splash(dev);
 		if (ret) {
 			log_debug("Cannot show splash screen\n");
 			return ret;
 		}
 	}

 	return 0;
 };

 /* Post-relocation, allocate memory for the frame buffer */
 static int video_post_bind(struct udevice *dev)
 {
 	struct video_uc_priv *uc_priv;
 	ulong addr;
 	ulong size;

 	/* Before relocation there is nothing to do here */
 	if (!(gd->flags & GD_FLG_RELOC))
 		return 0;

 	/* Set up the video pointer, if this is the first device */
 	uc_priv = uclass_get_priv(dev->uclass);
 	if (!uc_priv->video_ptr)
 		uc_priv->video_ptr = gd->video_top;

 	/* Allocate framebuffer space for this device */
 	addr = uc_priv->video_ptr;
 	size = alloc_fb(dev, &addr);
 	if (addr < gd->video_bottom) {
 		/* Device tree node may need the 'u-boot,dm-pre-reloc' or
 		 * 'u-boot,dm-pre-proper' tag
 		 */
 		printf("Video device '%s' cannot allocate frame buffer memory -ensure the device is set up before relocation\n",
 		       dev->name);
 		return -ENOSPC;
 	}
 	debug("%s: Claiming %lx bytes at %lx for video device '%s'\n",
 	      __func__, size, addr, dev->name);
 	uc_priv->video_ptr = addr;

 	return 0;
 }

 UCLASS_DRIVER(video) = {
 	.id		= UCLASS_VIDEO,
 	.name		= "video",
 	.flags		= DM_UC_FLAG_SEQ_ALIAS,
 	.post_bind	= video_post_bind,
 	.post_probe	= video_post_probe,
 	.priv_auto	= sizeof(struct video_uc_priv),
 	.per_device_auto	= sizeof(struct video_priv),
 	.per_device_plat_auto	= sizeof(struct video_uc_plat),
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (c) 2015 Google, Inc
	*/

	#define LOG_CATEGORY UCLASS_VIDEO

	#include <common.h>
	#include <console.h>
	#include <cpu_func.h>
	#include <dm.h>
	#include <log.h>
	#include <malloc.h>
	#include <mapmem.h>
	#include <stdio_dev.h>
	#include <video.h>
	#include <video_console.h>
	#include <asm/cache.h>
	#include <asm/global_data.h>
	#include <dm/lists.h>
	#include <dm/device_compat.h>
	#include <dm/device-internal.h>
	#include <dm/uclass-internal.h>
	#ifdef CONFIG_SANDBOX
	#include <asm/sdl.h>
	#endif

	/*
	* Theory of operation:
	*
	* Before relocation each device is bound. The driver for each device must
	* set the @align and @size values in struct video_uc_plat. This
	* information represents the requires size and alignment of the frame buffer
	* for the device. The values can be an over-estimate but cannot be too
	* small. The actual values will be suppled (in the same manner) by the bind()
	* method after relocation.
	*
	* This information is then picked up by video_reserve() which works out how
	* much memory is needed for all devices. This is allocated between
	* gd->video_bottom and gd->video_top.
	*
	* After relocation the same process occurs. The driver supplies the same
	* @size and @align information and this time video_post_bind() checks that
	* the drivers does not overflow the allocated memory.
	*
	* The frame buffer address is actually set (to plat->base) in
	* video_post_probe(). This function also clears the frame buffer and
	* allocates a suitable text console device. This can then be used to write
	* text to the video device.
	*/
	DECLARE_GLOBAL_DATA_PTR;

	/**
	* struct video_uc_priv - Information for the video uclass
	*
	* @video_ptr: Current allocation position of the video framebuffer pointer.
	* While binding devices after relocation, this points to the next
	* available address to use for a device's framebuffer. It starts at
	* gd->video_top and works downwards, running out of space when it hits
	* gd->video_bottom.
	*/
	struct video_uc_priv {
	ulong video_ptr;
	};

	void video_set_flush_dcache(struct udevice *dev, bool flush)
	{
	struct video_priv *priv = dev_get_uclass_priv(dev);

	priv->flush_dcache = flush;
	}

	static ulong alloc_fb(struct udevice dev, ulong addrp)
	{
	struct video_uc_plat *plat = dev_get_uclass_plat(dev);
	ulong base, align, size;

	if (!plat->size)
	return 0;

	align = plat->align ? plat->align : 1 << 20;
	base = *addrp - plat->size;
	base &= ~(align - 1);
	plat->base = base;
	size = *addrp - base;
	*addrp = base;

	return size;
	}

	int video_reserve(ulong *addrp)
	{
	struct udevice *dev;
	ulong size;

	gd->video_top = *addrp;
	for (uclass_find_first_device(UCLASS_VIDEO, &dev);
	dev;
	uclass_find_next_device(&dev)) {
	size = alloc_fb(dev, addrp);
	debug("%s: Reserving %lx bytes at %lx for video device '%s'\n",
	__func__, size, *addrp, dev->name);
	}

	/* Allocate space for PCI video devices in case there were not bound */
	if (*addrp == gd->video_top)
	*addrp -= CONFIG_VIDEO_PCI_DEFAULT_FB_SIZE;

	gd->video_bottom = *addrp;
	gd->fb_base = *addrp;
	debug("Video frame buffers from %lx to %lx\n", gd->video_bottom,
	gd->video_top);

	return 0;
	}

	int video_clear(struct udevice *dev)
	{
	struct video_priv *priv = dev_get_uclass_priv(dev);
	int ret;

	switch (priv->bpix) {
	case VIDEO_BPP16:
	if (IS_ENABLED(CONFIG_VIDEO_BPP16)) {
	u16 *ppix = priv->fb;
	u16 *end = priv->fb + priv->fb_size;

	while (ppix < end)
	*ppix++ = priv->colour_bg;
	break;
	}
	case VIDEO_BPP32:
	if (IS_ENABLED(CONFIG_VIDEO_BPP32)) {
	u32 *ppix = priv->fb;
	u32 *end = priv->fb + priv->fb_size;

	while (ppix < end)
	*ppix++ = priv->colour_bg;
	break;
	}
	default:
	memset(priv->fb, priv->colour_bg, priv->fb_size);
	break;
	}
	ret = video_sync_copy(dev, priv->fb, priv->fb + priv->fb_size);
	if (ret)
	return ret;

	return video_sync(dev, false);
	}

	void video_set_default_colors(struct udevice *dev, bool invert)
	{
	struct video_priv *priv = dev_get_uclass_priv(dev);
	int fore, back;

	if (CONFIG_IS_ENABLED(SYS_WHITE_ON_BLACK)) {
	/* White is used when switching to bold, use light gray here */
	fore = VID_LIGHT_GRAY;
	back = VID_BLACK;
	} else {
	fore = VID_BLACK;
	back = VID_WHITE;
	}
	if (invert) {
	int temp;

	temp = fore;
	fore = back;
	back = temp;
	}
	priv->fg_col_idx = fore;
	priv->bg_col_idx = back;
	priv->colour_fg = vid_console_color(priv, fore);
	priv->colour_bg = vid_console_color(priv, back);
	}

	/* Flush video activity to the caches */
	int video_sync(struct udevice *vid, bool force)
	{
	struct video_ops *ops = video_get_ops(vid);
	int ret;

	if (ops && ops->video_sync) {
	ret = ops->video_sync(vid);
	if (ret)
	return ret;
	}

	/*
	* flush_dcache_range() is declared in common.h but it seems that some
	* architectures do not actually implement it. Is there a way to find
	* out whether it exists? For now, ARM is safe.
	*/
	#if defined(CONFIG_ARM) && !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
	struct video_priv *priv = dev_get_uclass_priv(vid);

	if (priv->flush_dcache) {
	flush_dcache_range((ulong)priv->fb,
	ALIGN((ulong)priv->fb + priv->fb_size,
	CONFIG_SYS_CACHELINE_SIZE));
	}
	#elif defined(CONFIG_VIDEO_SANDBOX_SDL)
	struct video_priv *priv = dev_get_uclass_priv(vid);
	static ulong last_sync;

	if (force \|\| get_timer(last_sync) > 10) {
	sandbox_sdl_sync(priv->fb);
	last_sync = get_timer(0);
	}
	#endif
	return 0;
	}

	void video_sync_all(void)
	{
	struct udevice *dev;
	int ret;

	for (uclass_find_first_device(UCLASS_VIDEO, &dev);
	dev;
	uclass_find_next_device(&dev)) {
	if (device_active(dev)) {
	ret = video_sync(dev, true);
	if (ret)
	dev_dbg(dev, "Video sync failed\n");
	}
	}
	}

	bool video_is_active(void)
	{
	struct udevice *dev;

	for (uclass_find_first_device(UCLASS_VIDEO, &dev);
	dev;
	uclass_find_next_device(&dev)) {
	if (device_active(dev))
	return true;
	}

	return false;
	}

	int video_get_xsize(struct udevice *dev)
	{
	struct video_priv *priv = dev_get_uclass_priv(dev);

	return priv->xsize;
	}

	int video_get_ysize(struct udevice *dev)
	{
	struct video_priv *priv = dev_get_uclass_priv(dev);

	return priv->ysize;
	}

	#ifdef CONFIG_VIDEO_COPY
	int video_sync_copy(struct udevice dev, void from, void *to)
	{
	struct video_priv *priv = dev_get_uclass_priv(dev);

	if (priv->copy_fb) {
	long offset, size;

	/* Find the offset of the first byte to copy */
	if ((ulong)to > (ulong)from) {
	size = to - from;
	offset = from - priv->fb;
	} else {
	size = from - to;
	offset = to - priv->fb;
	}

	/*
	* Allow a bit of leeway for valid requests somewhere near the
	* frame buffer
	*/
	if (offset < -priv->fb_size \|\| offset > 2 * priv->fb_size) {
	#ifdef DEBUG
	char str[120];

	snprintf(str, sizeof(str),
	"[** FAULT sync_copy fb=%p, from=%p, to=%p, offset=%lx]",
	priv->fb, from, to, offset);
	console_puts_select_stderr(true, str);
	#endif
	return -EFAULT;
	}

	/*
	* Silently crop the memcpy. This allows callers to avoid doing
	* this themselves. It is common for the end pointer to go a
	* few lines after the end of the frame buffer, since most of
	* the update algorithms terminate a line after their last write
	*/
	if (offset + size > priv->fb_size) {
	size = priv->fb_size - offset;
	} else if (offset < 0) {
	size += offset;
	offset = 0;
	}

	memcpy(priv->copy_fb + offset, priv->fb + offset, size);
	}

	return 0;
	}

	int video_sync_copy_all(struct udevice *dev)
	{
	struct video_priv *priv = dev_get_uclass_priv(dev);

	video_sync_copy(dev, priv->fb, priv->fb + priv->fb_size);

	return 0;
	}

	#endif

	#define SPLASH_DECL(_name) \
	extern u8 __splash_ ## _name ## _begin[]; \
	extern u8 __splash_ ## _name ## _end[]

	#define SPLASH_START(_name) __splash_ ## _name ## _begin

	SPLASH_DECL(u_boot_logo);

	static int show_splash(struct udevice *dev)
	{
	u8 *data = SPLASH_START(u_boot_logo);
	int ret;

	ret = video_bmp_display(dev, map_to_sysmem(data), -4, 4, true);

	return 0;
	}

	/* Set up the display ready for use */
	static int video_post_probe(struct udevice *dev)
	{
	struct video_uc_plat *plat = dev_get_uclass_plat(dev);
	struct video_priv *priv = dev_get_uclass_priv(dev);
	char name[30], drv[15], *str;
	const char *drv_name = drv;
	struct udevice *cons;
	int ret;

	/* Set up the line and display size */
	priv->fb = map_sysmem(plat->base, plat->size);
	if (!priv->line_length)
	priv->line_length = priv->xsize * VNBYTES(priv->bpix);

	priv->fb_size = priv->line_length * priv->ysize;

	if (IS_ENABLED(CONFIG_VIDEO_COPY) && plat->copy_base)
	priv->copy_fb = map_sysmem(plat->copy_base, plat->size);

	/* Set up colors */
	video_set_default_colors(dev, false);

	if (!CONFIG_IS_ENABLED(NO_FB_CLEAR))
	video_clear(dev);

	/*
	* Create a text console device. For now we always do this, although
	* it might be useful to support only bitmap drawing on the device
	* for boards that don't need to display text. We create a TrueType
	* console if enabled, a rotated console if the video driver requests
	* it, otherwise a normal console.
	*
	* The console can be override by setting vidconsole_drv_name before
	* probing this video driver, or in the probe() method.
	*
	* TrueType does not support rotation at present so fall back to the
	* rotated console in that case.
	*/
	if (!priv->rot && IS_ENABLED(CONFIG_CONSOLE_TRUETYPE)) {
	snprintf(name, sizeof(name), "%s.vidconsole_tt", dev->name);
	strcpy(drv, "vidconsole_tt");
	} else {
	snprintf(name, sizeof(name), "%s.vidconsole%d", dev->name,
	priv->rot);
	snprintf(drv, sizeof(drv), "vidconsole%d", priv->rot);
	}

	str = strdup(name);
	if (!str)
	return -ENOMEM;
	if (priv->vidconsole_drv_name)
	drv_name = priv->vidconsole_drv_name;
	ret = device_bind_driver(dev, drv_name, str, &cons);
	if (ret) {
	debug("%s: Cannot bind console driver\n", __func__);
	return ret;
	}

	ret = device_probe(cons);
	if (ret) {
	debug("%s: Cannot probe console driver\n", __func__);
	return ret;
	}

	if (IS_ENABLED(CONFIG_VIDEO_LOGO) && !plat->hide_logo) {
	ret = show_splash(dev);
	if (ret) {
	log_debug("Cannot show splash screen\n");
	return ret;
	}
	}

	return 0;
	};

	/* Post-relocation, allocate memory for the frame buffer */
	static int video_post_bind(struct udevice *dev)
	{
	struct video_uc_priv *uc_priv;
	ulong addr;
	ulong size;

	/* Before relocation there is nothing to do here */
	if (!(gd->flags & GD_FLG_RELOC))
	return 0;

	/* Set up the video pointer, if this is the first device */
	uc_priv = uclass_get_priv(dev->uclass);
	if (!uc_priv->video_ptr)
	uc_priv->video_ptr = gd->video_top;

	/* Allocate framebuffer space for this device */
	addr = uc_priv->video_ptr;
	size = alloc_fb(dev, &addr);
	if (addr < gd->video_bottom) {
	/* Device tree node may need the 'u-boot,dm-pre-reloc' or
	* 'u-boot,dm-pre-proper' tag
	*/
	printf("Video device '%s' cannot allocate frame buffer memory -ensure the device is set up before relocation\n",
	dev->name);
	return -ENOSPC;
	}
	debug("%s: Claiming %lx bytes at %lx for video device '%s'\n",
	__func__, size, addr, dev->name);
	uc_priv->video_ptr = addr;

	return 0;
	}

	UCLASS_DRIVER(video) = {
	.id = UCLASS_VIDEO,
	.name = "video",
	.flags = DM_UC_FLAG_SEQ_ALIAS,
	.post_bind = video_post_bind,
	.post_probe = video_post_probe,
	.priv_auto = sizeof(struct video_uc_priv),
	.per_device_auto = sizeof(struct video_priv),
	.per_device_plat_auto = sizeof(struct video_uc_plat),
	};