1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2015 Google, Inc
13 #include <stdio_dev.h>
15 #include <video_console.h>
16 #include <asm/cache.h>
18 #include <dm/device-internal.h>
19 #include <dm/uclass-internal.h>
25 * Theory of operation:
27 * Before relocation each device is bound. The driver for each device must
28 * set the @align and @size values in struct video_uc_platdata. This
29 * information represents the requires size and alignment of the frame buffer
30 * for the device. The values can be an over-estimate but cannot be too
31 * small. The actual values will be suppled (in the same manner) by the bind()
32 * method after relocation.
34 * This information is then picked up by video_reserve() which works out how
35 * much memory is needed for all devices. This is allocated between
36 * gd->video_bottom and gd->video_top.
38 * After relocation the same process occurs. The driver supplies the same
39 * @size and @align information and this time video_post_bind() checks that
40 * the drivers does not overflow the allocated memory.
42 * The frame buffer address is actually set (to plat->base) in
43 * video_post_probe(). This function also clears the frame buffer and
44 * allocates a suitable text console device. This can then be used to write
45 * text to the video device.
47 DECLARE_GLOBAL_DATA_PTR;
49 void video_set_flush_dcache(struct udevice *dev, bool flush)
51 struct video_priv *priv = dev_get_uclass_priv(dev);
53 priv->flush_dcache = flush;
56 static ulong alloc_fb(struct udevice *dev, ulong *addrp)
58 struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
59 ulong base, align, size;
64 align = plat->align ? plat->align : 1 << 20;
65 base = *addrp - plat->size;
74 int video_reserve(ulong *addrp)
79 gd->video_top = *addrp;
80 for (uclass_find_first_device(UCLASS_VIDEO, &dev);
82 uclass_find_next_device(&dev)) {
83 size = alloc_fb(dev, addrp);
84 debug("%s: Reserving %lx bytes at %lx for video device '%s'\n",
85 __func__, size, *addrp, dev->name);
87 gd->video_bottom = *addrp;
89 debug("Video frame buffers from %lx to %lx\n", gd->video_bottom,
95 int video_clear(struct udevice *dev)
97 struct video_priv *priv = dev_get_uclass_priv(dev);
101 if (IS_ENABLED(CONFIG_VIDEO_BPP16)) {
102 u16 *ppix = priv->fb;
103 u16 *end = priv->fb + priv->fb_size;
106 *ppix++ = priv->colour_bg;
110 if (IS_ENABLED(CONFIG_VIDEO_BPP32)) {
111 u32 *ppix = priv->fb;
112 u32 *end = priv->fb + priv->fb_size;
115 *ppix++ = priv->colour_bg;
119 memset(priv->fb, priv->colour_bg, priv->fb_size);
126 void video_set_default_colors(struct udevice *dev, bool invert)
128 struct video_priv *priv = dev_get_uclass_priv(dev);
131 if (CONFIG_IS_ENABLED(SYS_WHITE_ON_BLACK)) {
132 /* White is used when switching to bold, use light gray here */
133 fore = VID_LIGHT_GRAY;
146 priv->fg_col_idx = fore;
147 priv->bg_col_idx = back;
148 priv->colour_fg = vid_console_color(priv, fore);
149 priv->colour_bg = vid_console_color(priv, back);
152 /* Flush video activity to the caches */
153 void video_sync(struct udevice *vid, bool force)
156 * flush_dcache_range() is declared in common.h but it seems that some
157 * architectures do not actually implement it. Is there a way to find
158 * out whether it exists? For now, ARM is safe.
160 #if defined(CONFIG_ARM) && !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
161 struct video_priv *priv = dev_get_uclass_priv(vid);
163 if (priv->flush_dcache) {
164 flush_dcache_range((ulong)priv->fb,
165 ALIGN((ulong)priv->fb + priv->fb_size,
166 CONFIG_SYS_CACHELINE_SIZE));
168 #elif defined(CONFIG_VIDEO_SANDBOX_SDL)
169 struct video_priv *priv = dev_get_uclass_priv(vid);
170 static ulong last_sync;
172 if (force || get_timer(last_sync) > 10) {
173 sandbox_sdl_sync(priv->fb);
174 last_sync = get_timer(0);
179 void video_sync_all(void)
183 for (uclass_find_first_device(UCLASS_VIDEO, &dev);
185 uclass_find_next_device(&dev)) {
186 if (device_active(dev))
187 video_sync(dev, true);
191 int video_get_xsize(struct udevice *dev)
193 struct video_priv *priv = dev_get_uclass_priv(dev);
198 int video_get_ysize(struct udevice *dev)
200 struct video_priv *priv = dev_get_uclass_priv(dev);
205 #ifdef CONFIG_VIDEO_COPY
206 int video_sync_copy(struct udevice *dev, void *from, void *to)
208 struct video_priv *priv = dev_get_uclass_priv(dev);
213 /* Find the offset of the first byte to copy */
214 if ((ulong)to > (ulong)from) {
216 offset = from - priv->fb;
219 offset = to - priv->fb;
223 * Allow a bit of leeway for valid requests somewhere near the
226 if (offset < -priv->fb_size || offset > 2 * priv->fb_size) {
230 snprintf(str, sizeof(str),
231 "[sync_copy fb=%p, from=%p, to=%p, offset=%lx]",
232 priv->fb, from, to, offset);
233 console_puts_select_stderr(true, str);
239 * Silently crop the memcpy. This allows callers to avoid doing
240 * this themselves. It is common for the end pointer to go a
241 * few lines after the end of the frame buffer, since most of
242 * the update algorithms terminate a line after their last write
244 if (offset + size > priv->fb_size) {
245 size = priv->fb_size - offset;
246 } else if (offset < 0) {
251 memcpy(priv->copy_fb + offset, priv->fb + offset, size);
258 /* Set up the colour map */
259 static int video_pre_probe(struct udevice *dev)
261 struct video_priv *priv = dev_get_uclass_priv(dev);
263 priv->cmap = calloc(256, sizeof(ushort));
270 static int video_pre_remove(struct udevice *dev)
272 struct video_priv *priv = dev_get_uclass_priv(dev);
279 /* Set up the display ready for use */
280 static int video_post_probe(struct udevice *dev)
282 struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
283 struct video_priv *priv = dev_get_uclass_priv(dev);
284 char name[30], drv[15], *str;
285 const char *drv_name = drv;
286 struct udevice *cons;
289 /* Set up the line and display size */
290 priv->fb = map_sysmem(plat->base, plat->size);
291 if (!priv->line_length)
292 priv->line_length = priv->xsize * VNBYTES(priv->bpix);
294 priv->fb_size = priv->line_length * priv->ysize;
297 video_set_default_colors(dev, false);
299 if (!CONFIG_IS_ENABLED(NO_FB_CLEAR))
303 * Create a text console device. For now we always do this, although
304 * it might be useful to support only bitmap drawing on the device
305 * for boards that don't need to display text. We create a TrueType
306 * console if enabled, a rotated console if the video driver requests
307 * it, otherwise a normal console.
309 * The console can be override by setting vidconsole_drv_name before
310 * probing this video driver, or in the probe() method.
312 * TrueType does not support rotation at present so fall back to the
313 * rotated console in that case.
315 if (!priv->rot && IS_ENABLED(CONFIG_CONSOLE_TRUETYPE)) {
316 snprintf(name, sizeof(name), "%s.vidconsole_tt", dev->name);
317 strcpy(drv, "vidconsole_tt");
319 snprintf(name, sizeof(name), "%s.vidconsole%d", dev->name,
321 snprintf(drv, sizeof(drv), "vidconsole%d", priv->rot);
327 if (priv->vidconsole_drv_name)
328 drv_name = priv->vidconsole_drv_name;
329 ret = device_bind_driver(dev, drv_name, str, &cons);
331 debug("%s: Cannot bind console driver\n", __func__);
335 ret = device_probe(cons);
337 debug("%s: Cannot probe console driver\n", __func__);
344 /* Post-relocation, allocate memory for the frame buffer */
345 static int video_post_bind(struct udevice *dev)
347 ulong addr = gd->video_top;
350 /* Before relocation there is nothing to do here */
351 if (!(gd->flags & GD_FLG_RELOC))
353 size = alloc_fb(dev, &addr);
354 if (addr < gd->video_bottom) {
355 /* Device tree node may need the 'u-boot,dm-pre-reloc' or
356 * 'u-boot,dm-pre-proper' tag
358 printf("Video device '%s' cannot allocate frame buffer memory -ensure the device is set up before relocation\n",
362 debug("%s: Claiming %lx bytes at %lx for video device '%s'\n",
363 __func__, size, addr, dev->name);
364 gd->video_bottom = addr;
369 UCLASS_DRIVER(video) = {
372 .flags = DM_UC_FLAG_SEQ_ALIAS,
373 .post_bind = video_post_bind,
374 .pre_probe = video_pre_probe,
375 .post_probe = video_post_probe,
376 .pre_remove = video_pre_remove,
377 .per_device_auto_alloc_size = sizeof(struct video_priv),
378 .per_device_platdata_auto_alloc_size = sizeof(struct video_uc_platdata),