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- // 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");
- }
- }
- }
- 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[80];
- snprintf(str, sizeof(str),
- "[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
- /* 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_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;
- }
- 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,
- .pre_probe = video_pre_probe,
- .post_probe = video_post_probe,
- .pre_remove = video_pre_remove,
- .priv_auto = sizeof(struct video_uc_priv),
- .per_device_auto = sizeof(struct video_priv),
- .per_device_plat_auto = sizeof(struct video_uc_plat),
- };
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