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1acafc73 SG |
1 | /* |
2 | * Copyright (c) 2015 Google, Inc | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0+ | |
5 | */ | |
6 | ||
7 | #include <common.h> | |
8 | #include <dm.h> | |
9 | #include <mapmem.h> | |
10 | #include <stdio_dev.h> | |
11 | #include <video.h> | |
12 | #include <video_console.h> | |
13 | #include <dm/lists.h> | |
14 | #include <dm/device-internal.h> | |
15 | #include <dm/uclass-internal.h> | |
16 | #ifdef CONFIG_SANDBOX | |
17 | #include <asm/sdl.h> | |
18 | #endif | |
19 | ||
20 | /* | |
21 | * Theory of operation: | |
22 | * | |
23 | * Before relocation each device is bound. The driver for each device must | |
24 | * set the @align and @size values in struct video_uc_platdata. This | |
25 | * information represents the requires size and alignment of the frame buffer | |
26 | * for the device. The values can be an over-estimate but cannot be too | |
27 | * small. The actual values will be suppled (in the same manner) by the bind() | |
28 | * method after relocation. | |
29 | * | |
30 | * This information is then picked up by video_reserve() which works out how | |
31 | * much memory is needed for all devices. This is allocated between | |
32 | * gd->video_bottom and gd->video_top. | |
33 | * | |
34 | * After relocation the same process occurs. The driver supplies the same | |
35 | * @size and @align information and this time video_post_bind() checks that | |
36 | * the drivers does not overflow the allocated memory. | |
37 | * | |
38 | * The frame buffer address is actually set (to plat->base) in | |
39 | * video_post_probe(). This function also clears the frame buffer and | |
40 | * allocates a suitable text console device. This can then be used to write | |
41 | * text to the video device. | |
42 | */ | |
43 | DECLARE_GLOBAL_DATA_PTR; | |
44 | ||
68dcdc99 SG |
45 | void video_set_flush_dcache(struct udevice *dev, bool flush) |
46 | { | |
47 | struct video_priv *priv = dev_get_uclass_priv(dev); | |
48 | ||
49 | priv->flush_dcache = flush; | |
50 | } | |
51 | ||
1acafc73 SG |
52 | static ulong alloc_fb(struct udevice *dev, ulong *addrp) |
53 | { | |
54 | struct video_uc_platdata *plat = dev_get_uclass_platdata(dev); | |
55 | ulong base, align, size; | |
56 | ||
3968398e BM |
57 | if (!plat->size) |
58 | return 0; | |
59 | ||
1acafc73 SG |
60 | align = plat->align ? plat->align : 1 << 20; |
61 | base = *addrp - plat->size; | |
62 | base &= ~(align - 1); | |
63 | plat->base = base; | |
64 | size = *addrp - base; | |
65 | *addrp = base; | |
66 | ||
67 | return size; | |
68 | } | |
69 | ||
70 | int video_reserve(ulong *addrp) | |
71 | { | |
72 | struct udevice *dev; | |
73 | ulong size; | |
74 | ||
75 | gd->video_top = *addrp; | |
76 | for (uclass_find_first_device(UCLASS_VIDEO, &dev); | |
77 | dev; | |
78 | uclass_find_next_device(&dev)) { | |
79 | size = alloc_fb(dev, addrp); | |
80 | debug("%s: Reserving %lx bytes at %lx for video device '%s'\n", | |
81 | __func__, size, *addrp, dev->name); | |
82 | } | |
83 | gd->video_bottom = *addrp; | |
84 | debug("Video frame buffers from %lx to %lx\n", gd->video_bottom, | |
85 | gd->video_top); | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
90 | static int video_clear(struct udevice *dev) | |
91 | { | |
92 | struct video_priv *priv = dev_get_uclass_priv(dev); | |
93 | ||
94 | if (priv->bpix == VIDEO_BPP32) { | |
95 | u32 *ppix = priv->fb; | |
96 | u32 *end = priv->fb + priv->fb_size; | |
97 | ||
98 | while (ppix < end) | |
99 | *ppix++ = priv->colour_bg; | |
100 | } else { | |
101 | memset(priv->fb, priv->colour_bg, priv->fb_size); | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | /* Flush video activity to the caches */ | |
108 | void video_sync(struct udevice *vid) | |
109 | { | |
110 | /* | |
111 | * flush_dcache_range() is declared in common.h but it seems that some | |
112 | * architectures do not actually implement it. Is there a way to find | |
113 | * out whether it exists? For now, ARM is safe. | |
114 | */ | |
115 | #if defined(CONFIG_ARM) && !defined(CONFIG_SYS_DCACHE_OFF) | |
116 | struct video_priv *priv = dev_get_uclass_priv(vid); | |
117 | ||
118 | if (priv->flush_dcache) { | |
119 | flush_dcache_range((ulong)priv->fb, | |
7981394e SG |
120 | ALIGN((ulong)priv->fb + priv->fb_size, |
121 | CONFIG_SYS_CACHELINE_SIZE)); | |
1acafc73 SG |
122 | } |
123 | #elif defined(CONFIG_VIDEO_SANDBOX_SDL) | |
124 | struct video_priv *priv = dev_get_uclass_priv(vid); | |
125 | static ulong last_sync; | |
126 | ||
127 | if (get_timer(last_sync) > 10) { | |
128 | sandbox_sdl_sync(priv->fb); | |
129 | last_sync = get_timer(0); | |
130 | } | |
131 | #endif | |
132 | } | |
133 | ||
134 | void video_sync_all(void) | |
135 | { | |
136 | struct udevice *dev; | |
137 | ||
138 | for (uclass_find_first_device(UCLASS_VIDEO, &dev); | |
139 | dev; | |
140 | uclass_find_next_device(&dev)) { | |
141 | if (device_active(dev)) | |
142 | video_sync(dev); | |
143 | } | |
144 | } | |
145 | ||
146 | int video_get_xsize(struct udevice *dev) | |
147 | { | |
148 | struct video_priv *priv = dev_get_uclass_priv(dev); | |
149 | ||
150 | return priv->xsize; | |
151 | } | |
152 | ||
153 | int video_get_ysize(struct udevice *dev) | |
154 | { | |
155 | struct video_priv *priv = dev_get_uclass_priv(dev); | |
156 | ||
157 | return priv->ysize; | |
158 | } | |
159 | ||
160 | /* Set up the colour map */ | |
161 | static int video_pre_probe(struct udevice *dev) | |
162 | { | |
163 | struct video_priv *priv = dev_get_uclass_priv(dev); | |
164 | ||
165 | priv->cmap = calloc(256, sizeof(ushort)); | |
166 | if (!priv->cmap) | |
167 | return -ENOMEM; | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static int video_pre_remove(struct udevice *dev) | |
173 | { | |
174 | struct video_priv *priv = dev_get_uclass_priv(dev); | |
175 | ||
176 | free(priv->cmap); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | /* Set up the display ready for use */ | |
182 | static int video_post_probe(struct udevice *dev) | |
183 | { | |
184 | struct video_uc_platdata *plat = dev_get_uclass_platdata(dev); | |
185 | struct video_priv *priv = dev_get_uclass_priv(dev); | |
186 | char name[30], drv[15], *str; | |
826f35f9 | 187 | const char *drv_name = drv; |
1acafc73 SG |
188 | struct udevice *cons; |
189 | int ret; | |
190 | ||
191 | /* Set up the line and display size */ | |
192 | priv->fb = map_sysmem(plat->base, plat->size); | |
193 | priv->line_length = priv->xsize * VNBYTES(priv->bpix); | |
194 | priv->fb_size = priv->line_length * priv->ysize; | |
195 | ||
196 | /* Set up colours - we could in future support other colours */ | |
197 | #ifdef CONFIG_SYS_WHITE_ON_BLACK | |
198 | priv->colour_fg = 0xffffff; | |
199 | #else | |
200 | priv->colour_bg = 0xffffff; | |
201 | #endif | |
202 | video_clear(dev); | |
203 | ||
83510766 | 204 | /* |
826f35f9 | 205 | * Create a text console device. For now we always do this, although |
83510766 | 206 | * it might be useful to support only bitmap drawing on the device |
826f35f9 SG |
207 | * for boards that don't need to display text. We create a TrueType |
208 | * console if enabled, a rotated console if the video driver requests | |
209 | * it, otherwise a normal console. | |
210 | * | |
211 | * The console can be override by setting vidconsole_drv_name before | |
212 | * probing this video driver, or in the probe() method. | |
213 | * | |
214 | * TrueType does not support rotation at present so fall back to the | |
215 | * rotated console in that case. | |
83510766 | 216 | */ |
826f35f9 | 217 | if (!priv->rot && IS_ENABLED(CONFIG_CONSOLE_TRUETYPE)) { |
a29b0120 SG |
218 | snprintf(name, sizeof(name), "%s.vidconsole_tt", dev->name); |
219 | strcpy(drv, "vidconsole_tt"); | |
220 | } else { | |
221 | snprintf(name, sizeof(name), "%s.vidconsole%d", dev->name, | |
222 | priv->rot); | |
223 | snprintf(drv, sizeof(drv), "vidconsole%d", priv->rot); | |
224 | } | |
225 | ||
83510766 SG |
226 | str = strdup(name); |
227 | if (!str) | |
228 | return -ENOMEM; | |
826f35f9 SG |
229 | if (priv->vidconsole_drv_name) |
230 | drv_name = priv->vidconsole_drv_name; | |
231 | ret = device_bind_driver(dev, drv_name, str, &cons); | |
83510766 SG |
232 | if (ret) { |
233 | debug("%s: Cannot bind console driver\n", __func__); | |
234 | return ret; | |
235 | } | |
826f35f9 | 236 | |
83510766 SG |
237 | ret = device_probe(cons); |
238 | if (ret) { | |
239 | debug("%s: Cannot probe console driver\n", __func__); | |
240 | return ret; | |
241 | } | |
242 | ||
1acafc73 SG |
243 | return 0; |
244 | }; | |
245 | ||
246 | /* Post-relocation, allocate memory for the frame buffer */ | |
247 | static int video_post_bind(struct udevice *dev) | |
248 | { | |
249 | ulong addr = gd->video_top; | |
250 | ulong size; | |
251 | ||
252 | /* Before relocation there is nothing to do here */ | |
253 | if ((!gd->flags & GD_FLG_RELOC)) | |
254 | return 0; | |
255 | size = alloc_fb(dev, &addr); | |
256 | if (addr < gd->video_bottom) { | |
257 | /* Device tree node may need the 'u-boot,dm-pre-reloc' tag */ | |
258 | printf("Video device '%s' cannot allocate frame buffer memory -ensure the device is set up before relocation\n", | |
259 | dev->name); | |
260 | return -ENOSPC; | |
261 | } | |
262 | debug("%s: Claiming %lx bytes at %lx for video device '%s'\n", | |
263 | __func__, size, addr, dev->name); | |
264 | gd->video_bottom = addr; | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | UCLASS_DRIVER(video) = { | |
270 | .id = UCLASS_VIDEO, | |
271 | .name = "video", | |
272 | .flags = DM_UC_FLAG_SEQ_ALIAS, | |
273 | .post_bind = video_post_bind, | |
274 | .pre_probe = video_pre_probe, | |
275 | .post_probe = video_post_probe, | |
276 | .pre_remove = video_pre_remove, | |
277 | .per_device_auto_alloc_size = sizeof(struct video_priv), | |
278 | .per_device_platdata_auto_alloc_size = sizeof(struct video_uc_platdata), | |
279 | }; |