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 align = plat->align ? plat->align : 1 << 20; 58 base = *addrp - plat->size; 59 base &= ~(align - 1); 60 plat->base = base; 61 size = *addrp - base; 62 *addrp = base; 63 64 return size; 65 } 66 67 int video_reserve(ulong *addrp) 68 { 69 struct udevice *dev; 70 ulong size; 71 72 gd->video_top = *addrp; 73 for (uclass_find_first_device(UCLASS_VIDEO, &dev); 74 dev; 75 uclass_find_next_device(&dev)) { 76 size = alloc_fb(dev, addrp); 77 debug("%s: Reserving %lx bytes at %lx for video device '%s'\n", 78 __func__, size, *addrp, dev->name); 79 } 80 gd->video_bottom = *addrp; 81 debug("Video frame buffers from %lx to %lx\n", gd->video_bottom, 82 gd->video_top); 83 84 return 0; 85 } 86 87 static int video_clear(struct udevice *dev) 88 { 89 struct video_priv *priv = dev_get_uclass_priv(dev); 90 91 if (priv->bpix == VIDEO_BPP32) { 92 u32 *ppix = priv->fb; 93 u32 *end = priv->fb + priv->fb_size; 94 95 while (ppix < end) 96 *ppix++ = priv->colour_bg; 97 } else { 98 memset(priv->fb, priv->colour_bg, priv->fb_size); 99 } 100 101 return 0; 102 } 103 104 /* Flush video activity to the caches */ 105 void video_sync(struct udevice *vid) 106 { 107 /* 108 * flush_dcache_range() is declared in common.h but it seems that some 109 * architectures do not actually implement it. Is there a way to find 110 * out whether it exists? For now, ARM is safe. 111 */ 112 #if defined(CONFIG_ARM) && !defined(CONFIG_SYS_DCACHE_OFF) 113 struct video_priv *priv = dev_get_uclass_priv(vid); 114 115 if (priv->flush_dcache) { 116 flush_dcache_range((ulong)priv->fb, 117 (ulong)priv->fb + priv->fb_size); 118 } 119 #elif defined(CONFIG_VIDEO_SANDBOX_SDL) 120 struct video_priv *priv = dev_get_uclass_priv(vid); 121 static ulong last_sync; 122 123 if (get_timer(last_sync) > 10) { 124 sandbox_sdl_sync(priv->fb); 125 last_sync = get_timer(0); 126 } 127 #endif 128 } 129 130 void video_sync_all(void) 131 { 132 struct udevice *dev; 133 134 for (uclass_find_first_device(UCLASS_VIDEO, &dev); 135 dev; 136 uclass_find_next_device(&dev)) { 137 if (device_active(dev)) 138 video_sync(dev); 139 } 140 } 141 142 int video_get_xsize(struct udevice *dev) 143 { 144 struct video_priv *priv = dev_get_uclass_priv(dev); 145 146 return priv->xsize; 147 } 148 149 int video_get_ysize(struct udevice *dev) 150 { 151 struct video_priv *priv = dev_get_uclass_priv(dev); 152 153 return priv->ysize; 154 } 155 156 /* Set up the colour map */ 157 static int video_pre_probe(struct udevice *dev) 158 { 159 struct video_priv *priv = dev_get_uclass_priv(dev); 160 161 priv->cmap = calloc(256, sizeof(ushort)); 162 if (!priv->cmap) 163 return -ENOMEM; 164 165 return 0; 166 } 167 168 static int video_pre_remove(struct udevice *dev) 169 { 170 struct video_priv *priv = dev_get_uclass_priv(dev); 171 172 free(priv->cmap); 173 174 return 0; 175 } 176 177 /* Set up the display ready for use */ 178 static int video_post_probe(struct udevice *dev) 179 { 180 struct video_uc_platdata *plat = dev_get_uclass_platdata(dev); 181 struct video_priv *priv = dev_get_uclass_priv(dev); 182 char name[30], drv[15], *str; 183 struct udevice *cons; 184 int ret; 185 186 /* Set up the line and display size */ 187 priv->fb = map_sysmem(plat->base, plat->size); 188 priv->line_length = priv->xsize * VNBYTES(priv->bpix); 189 priv->fb_size = priv->line_length * priv->ysize; 190 191 /* Set up colours - we could in future support other colours */ 192 #ifdef CONFIG_SYS_WHITE_ON_BLACK 193 priv->colour_fg = 0xffffff; 194 #else 195 priv->colour_bg = 0xffffff; 196 #endif 197 video_clear(dev); 198 199 /* 200 * Create a text console devices. For now we always do this, although 201 * it might be useful to support only bitmap drawing on the device 202 * for boards that don't need to display text. 203 */ 204 snprintf(name, sizeof(name), "%s.vidconsole", dev->name); 205 str = strdup(name); 206 if (!str) 207 return -ENOMEM; 208 snprintf(drv, sizeof(drv), "vidconsole%d", priv->rot); 209 ret = device_bind_driver(dev, drv, str, &cons); 210 if (ret) { 211 debug("%s: Cannot bind console driver\n", __func__); 212 return ret; 213 } 214 ret = device_probe(cons); 215 if (ret) { 216 debug("%s: Cannot probe console driver\n", __func__); 217 return ret; 218 } 219 220 return 0; 221 }; 222 223 /* Post-relocation, allocate memory for the frame buffer */ 224 static int video_post_bind(struct udevice *dev) 225 { 226 ulong addr = gd->video_top; 227 ulong size; 228 229 /* Before relocation there is nothing to do here */ 230 if ((!gd->flags & GD_FLG_RELOC)) 231 return 0; 232 size = alloc_fb(dev, &addr); 233 if (addr < gd->video_bottom) { 234 /* Device tree node may need the 'u-boot,dm-pre-reloc' tag */ 235 printf("Video device '%s' cannot allocate frame buffer memory -ensure the device is set up before relocation\n", 236 dev->name); 237 return -ENOSPC; 238 } 239 debug("%s: Claiming %lx bytes at %lx for video device '%s'\n", 240 __func__, size, addr, dev->name); 241 gd->video_bottom = addr; 242 243 return 0; 244 } 245 246 UCLASS_DRIVER(video) = { 247 .id = UCLASS_VIDEO, 248 .name = "video", 249 .flags = DM_UC_FLAG_SEQ_ALIAS, 250 .post_bind = video_post_bind, 251 .pre_probe = video_pre_probe, 252 .post_probe = video_post_probe, 253 .pre_remove = video_pre_remove, 254 .per_device_auto_alloc_size = sizeof(struct video_priv), 255 .per_device_platdata_auto_alloc_size = sizeof(struct video_uc_platdata), 256 }; 257