--- /dev/null
+/*
+ * 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;
+
+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;
+ 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);
+
+ 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),
+};
projects / people / ms / u-boot.git / blobdiff