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 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 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 57 if (!plat->size) 58 return 0; 59 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, 120 ALIGN((ulong)priv->fb + priv->fb_size, 121 CONFIG_SYS_CACHELINE_SIZE)); 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; 187 const char *drv_name = drv; 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); 203 204 /* 205 * Create a text console device. For now we always do this, although 206 * it might be useful to support only bitmap drawing on the device 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. 216 */ 217 if (!priv->rot && IS_ENABLED(CONFIG_CONSOLE_TRUETYPE)) { 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 } 225 226 str = strdup(name); 227 if (!str) 228 return -ENOMEM; 229 if (priv->vidconsole_drv_name) 230 drv_name = priv->vidconsole_drv_name; 231 ret = device_bind_driver(dev, drv_name, str, &cons); 232 if (ret) { 233 debug("%s: Cannot bind console driver\n", __func__); 234 return ret; 235 } 236 237 ret = device_probe(cons); 238 if (ret) { 239 debug("%s: Cannot probe console driver\n", __func__); 240 return ret; 241 } 242 243 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 }; 280