1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2015 Google, Inc
11 #include <video_console.h>
13 #include <dm/device-internal.h>
14 #include <dm/uclass-internal.h>
20 * Theory of operation:
22 * Before relocation each device is bound. The driver for each device must
23 * set the @align and @size values in struct video_uc_platdata. This
24 * information represents the requires size and alignment of the frame buffer
25 * for the device. The values can be an over-estimate but cannot be too
26 * small. The actual values will be suppled (in the same manner) by the bind()
27 * method after relocation.
29 * This information is then picked up by video_reserve() which works out how
30 * much memory is needed for all devices. This is allocated between
31 * gd->video_bottom and gd->video_top.
33 * After relocation the same process occurs. The driver supplies the same
34 * @size and @align information and this time video_post_bind() checks that
35 * the drivers does not overflow the allocated memory.
37 * The frame buffer address is actually set (to plat->base) in
38 * video_post_probe(). This function also clears the frame buffer and
39 * allocates a suitable text console device. This can then be used to write
40 * text to the video device.
42 DECLARE_GLOBAL_DATA_PTR
;
44 void video_set_flush_dcache(struct udevice
*dev
, bool flush
)
46 struct video_priv
*priv
= dev_get_uclass_priv(dev
);
48 priv
->flush_dcache
= flush
;
51 static ulong
alloc_fb(struct udevice
*dev
, ulong
*addrp
)
53 struct video_uc_platdata
*plat
= dev_get_uclass_platdata(dev
);
54 ulong base
, align
, size
;
59 align
= plat
->align
? plat
->align
: 1 << 20;
60 base
= *addrp
- plat
->size
;
69 int video_reserve(ulong
*addrp
)
74 gd
->video_top
= *addrp
;
75 for (uclass_find_first_device(UCLASS_VIDEO
, &dev
);
77 uclass_find_next_device(&dev
)) {
78 size
= alloc_fb(dev
, addrp
);
79 debug("%s: Reserving %lx bytes at %lx for video device '%s'\n",
80 __func__
, size
, *addrp
, dev
->name
);
82 gd
->video_bottom
= *addrp
;
83 debug("Video frame buffers from %lx to %lx\n", gd
->video_bottom
,
89 int video_clear(struct udevice
*dev
)
91 struct video_priv
*priv
= dev_get_uclass_priv(dev
);
96 u16
*end
= priv
->fb
+ priv
->fb_size
;
99 *ppix
++ = priv
->colour_bg
;
103 u32
*ppix
= priv
->fb
;
104 u32
*end
= priv
->fb
+ priv
->fb_size
;
107 *ppix
++ = priv
->colour_bg
;
111 memset(priv
->fb
, priv
->colour_bg
, priv
->fb_size
);
118 void video_set_default_colors(struct video_priv
*priv
)
120 #ifdef CONFIG_SYS_WHITE_ON_BLACK
121 /* White is used when switching to bold, use light gray here */
122 priv
->fg_col_idx
= VID_LIGHT_GRAY
;
123 priv
->colour_fg
= vid_console_color(priv
, VID_LIGHT_GRAY
);
124 priv
->colour_bg
= vid_console_color(priv
, VID_BLACK
);
126 priv
->fg_col_idx
= VID_BLACK
;
127 priv
->colour_fg
= vid_console_color(priv
, VID_BLACK
);
128 priv
->colour_bg
= vid_console_color(priv
, VID_WHITE
);
132 /* Flush video activity to the caches */
133 void video_sync(struct udevice
*vid
, bool force
)
136 * flush_dcache_range() is declared in common.h but it seems that some
137 * architectures do not actually implement it. Is there a way to find
138 * out whether it exists? For now, ARM is safe.
140 #if defined(CONFIG_ARM) && !defined(CONFIG_SYS_DCACHE_OFF)
141 struct video_priv
*priv
= dev_get_uclass_priv(vid
);
143 if (priv
->flush_dcache
) {
144 flush_dcache_range((ulong
)priv
->fb
,
145 ALIGN((ulong
)priv
->fb
+ priv
->fb_size
,
146 CONFIG_SYS_CACHELINE_SIZE
));
148 #elif defined(CONFIG_VIDEO_SANDBOX_SDL)
149 struct video_priv
*priv
= dev_get_uclass_priv(vid
);
150 static ulong last_sync
;
152 if (force
|| get_timer(last_sync
) > 10) {
153 sandbox_sdl_sync(priv
->fb
);
154 last_sync
= get_timer(0);
159 void video_sync_all(void)
163 for (uclass_find_first_device(UCLASS_VIDEO
, &dev
);
165 uclass_find_next_device(&dev
)) {
166 if (device_active(dev
))
167 video_sync(dev
, true);
171 int video_get_xsize(struct udevice
*dev
)
173 struct video_priv
*priv
= dev_get_uclass_priv(dev
);
178 int video_get_ysize(struct udevice
*dev
)
180 struct video_priv
*priv
= dev_get_uclass_priv(dev
);
185 /* Set up the colour map */
186 static int video_pre_probe(struct udevice
*dev
)
188 struct video_priv
*priv
= dev_get_uclass_priv(dev
);
190 priv
->cmap
= calloc(256, sizeof(ushort
));
197 static int video_pre_remove(struct udevice
*dev
)
199 struct video_priv
*priv
= dev_get_uclass_priv(dev
);
206 /* Set up the display ready for use */
207 static int video_post_probe(struct udevice
*dev
)
209 struct video_uc_platdata
*plat
= dev_get_uclass_platdata(dev
);
210 struct video_priv
*priv
= dev_get_uclass_priv(dev
);
211 char name
[30], drv
[15], *str
;
212 const char *drv_name
= drv
;
213 struct udevice
*cons
;
216 /* Set up the line and display size */
217 priv
->fb
= map_sysmem(plat
->base
, plat
->size
);
218 priv
->line_length
= priv
->xsize
* VNBYTES(priv
->bpix
);
219 priv
->fb_size
= priv
->line_length
* priv
->ysize
;
222 video_set_default_colors(priv
);
224 if (!CONFIG_IS_ENABLED(NO_FB_CLEAR
))
228 * Create a text console device. For now we always do this, although
229 * it might be useful to support only bitmap drawing on the device
230 * for boards that don't need to display text. We create a TrueType
231 * console if enabled, a rotated console if the video driver requests
232 * it, otherwise a normal console.
234 * The console can be override by setting vidconsole_drv_name before
235 * probing this video driver, or in the probe() method.
237 * TrueType does not support rotation at present so fall back to the
238 * rotated console in that case.
240 if (!priv
->rot
&& IS_ENABLED(CONFIG_CONSOLE_TRUETYPE
)) {
241 snprintf(name
, sizeof(name
), "%s.vidconsole_tt", dev
->name
);
242 strcpy(drv
, "vidconsole_tt");
244 snprintf(name
, sizeof(name
), "%s.vidconsole%d", dev
->name
,
246 snprintf(drv
, sizeof(drv
), "vidconsole%d", priv
->rot
);
252 if (priv
->vidconsole_drv_name
)
253 drv_name
= priv
->vidconsole_drv_name
;
254 ret
= device_bind_driver(dev
, drv_name
, str
, &cons
);
256 debug("%s: Cannot bind console driver\n", __func__
);
260 ret
= device_probe(cons
);
262 debug("%s: Cannot probe console driver\n", __func__
);
269 /* Post-relocation, allocate memory for the frame buffer */
270 static int video_post_bind(struct udevice
*dev
)
272 ulong addr
= gd
->video_top
;
275 /* Before relocation there is nothing to do here */
276 if (!(gd
->flags
& GD_FLG_RELOC
))
278 size
= alloc_fb(dev
, &addr
);
279 if (addr
< gd
->video_bottom
) {
280 /* Device tree node may need the 'u-boot,dm-pre-reloc' tag */
281 printf("Video device '%s' cannot allocate frame buffer memory -ensure the device is set up before relocation\n",
285 debug("%s: Claiming %lx bytes at %lx for video device '%s'\n",
286 __func__
, size
, addr
, dev
->name
);
287 gd
->video_bottom
= addr
;
292 UCLASS_DRIVER(video
) = {
295 .flags
= DM_UC_FLAG_SEQ_ALIAS
,
296 .post_bind
= video_post_bind
,
297 .pre_probe
= video_pre_probe
,
298 .post_probe
= video_post_probe
,
299 .pre_remove
= video_pre_remove
,
300 .per_device_auto_alloc_size
= sizeof(struct video_priv
),
301 .per_device_platdata_auto_alloc_size
= sizeof(struct video_uc_platdata
),