avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/drivers/video/video-uclass.c

@@ -0,0 +1,275 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <mapmem.h>
+#include <stdio_dev.h>
+#include <video.h>
+#include <video_console.h>
+#include <dm/lists.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_platdata. 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;
+
+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_platdata *plat = dev_get_uclass_platdata(dev);
+	ulong base, align, size;
+
+	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);
+	}
+	gd->video_bottom = *addrp;
+	debug("Video frame buffers from %lx to %lx\n", gd->video_bottom,
+	      gd->video_top);
+
+	return 0;
+}
+
+static int video_clear(struct udevice *dev)
+{
+	struct video_priv *priv = dev_get_uclass_priv(dev);
+
+	if (priv->bpix == VIDEO_BPP32) {
+		u32 *ppix = priv->fb;
+		u32 *end = priv->fb + priv->fb_size;
+
+		while (ppix < end)
+			*ppix++ = priv->colour_bg;
+	} else {
+		memset(priv->fb, priv->colour_bg, priv->fb_size);
+	}
+
+	return 0;
+}
+
+/* Flush video activity to the caches */
+void video_sync(struct udevice *vid)
+{
+	/*
+	 * 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) && !defined(CONFIG_SYS_DCACHE_OFF)
+	struct video_priv *priv = dev_get_uclass_priv(vid);
+
+	if (priv->flush_dcache) {
+		flush_dcache_range((ulong)priv->fb,
+				   (ulong)priv->fb + priv->fb_size);
+	}
+#elif defined(CONFIG_VIDEO_SANDBOX_SDL)
+	struct video_priv *priv = dev_get_uclass_priv(vid);
+	static ulong last_sync;
+
+	if (get_timer(last_sync) > 10) {
+		sandbox_sdl_sync(priv->fb);
+		last_sync = get_timer(0);
+	}
+#endif
+}
+
+void video_sync_all(void)
+{
+	struct udevice *dev;
+
+	for (uclass_find_first_device(UCLASS_VIDEO, &dev);
+	     dev;
+	     uclass_find_next_device(&dev)) {
+		if (device_active(dev))
+			video_sync(dev);
+	}
+}
+
+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;
+}
+
+/* Set up the colour map */
+static int video_pre_probe(struct udevice *dev)
+{
+	struct video_priv *priv = dev_get_uclass_priv(dev);
+
+	priv->cmap = calloc(256, sizeof(ushort));
+	if (!priv->cmap)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int video_pre_remove(struct udevice *dev)
+{
+	struct video_priv *priv = dev_get_uclass_priv(dev);
+
+	free(priv->cmap);
+
+	return 0;
+}
+
+/* Set up the display ready for use */
+static int video_post_probe(struct udevice *dev)
+{
+	struct video_uc_platdata *plat = dev_get_uclass_platdata(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);
+	priv->line_length = priv->xsize * VNBYTES(priv->bpix);
+	priv->fb_size = priv->line_length * priv->ysize;
+
+	/* Set up colours - we could in future support other colours */
+#ifdef CONFIG_SYS_WHITE_ON_BLACK
+	priv->colour_fg = 0xffffff;
+#else
+	priv->colour_bg = 0xffffff;
+#endif
+	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;
+	}
+
+	return 0;
+};
+
+/* Post-relocation, allocate memory for the frame buffer */
+static int video_post_bind(struct udevice *dev)
+{
+	ulong addr = gd->video_top;
+	ulong size;
+
+	/* Before relocation there is nothing to do here */
+	if ((!gd->flags & GD_FLG_RELOC))
+		return 0;
+	size = alloc_fb(dev, &addr);
+	if (addr < gd->video_bottom) {
+		/* Device tree node may need the 'u-boot,dm-pre-reloc' 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);
+	gd->video_bottom = addr;
+
+	return 0;
+}
+
+UCLASS_DRIVER(video) = {
+	.id		= UCLASS_VIDEO,
+	.name		= "video",
+	.flags		= DM_UC_FLAG_SEQ_ALIAS,
+	.post_bind	= video_post_bind,
+	.pre_probe	= video_pre_probe,
+	.post_probe	= video_post_probe,
+	.pre_remove	= video_pre_remove,
+	.per_device_auto_alloc_size	= sizeof(struct video_priv),
+	.per_device_platdata_auto_alloc_size = sizeof(struct video_uc_platdata),
+};