1 /* 2 * Raspberry Pi emulation (c) 2012 Gregory Estrade 3 * Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann. 4 * This code is licensed under the GNU GPLv2 and later. 5 * 6 * Heavily based on milkymist-vgafb.c, copyright terms below: 7 * QEMU model of the Milkymist VGA framebuffer. 8 * 9 * Copyright (c) 2010-2012 Michael Walle <michael@walle.cc> 10 * 11 * This library is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU Lesser General Public 13 * License as published by the Free Software Foundation; either 14 * version 2 of the License, or (at your option) any later version. 15 * 16 * This library is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * Lesser General Public License for more details. 20 * 21 * You should have received a copy of the GNU Lesser General Public 22 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 23 * 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qapi/error.h" 28 #include "hw/display/bcm2835_fb.h" 29 #include "hw/irq.h" 30 #include "framebuffer.h" 31 #include "ui/pixel_ops.h" 32 #include "hw/misc/bcm2835_mbox_defs.h" 33 #include "qemu/log.h" 34 #include "qemu/module.h" 35 36 #define DEFAULT_VCRAM_SIZE 0x4000000 37 #define BCM2835_FB_OFFSET 0x00100000 38 39 /* Maximum permitted framebuffer size; experimentally determined on an rpi2 */ 40 #define XRES_MAX 3840 41 #define YRES_MAX 2560 42 /* Framebuffer size used if guest requests zero size */ 43 #define XRES_SMALL 592 44 #define YRES_SMALL 488 45 46 static void fb_invalidate_display(void *opaque) 47 { 48 BCM2835FBState *s = BCM2835_FB(opaque); 49 50 s->invalidate = true; 51 } 52 53 static void draw_line_src16(void *opaque, uint8_t *dst, const uint8_t *src, 54 int width, int deststep) 55 { 56 BCM2835FBState *s = opaque; 57 uint16_t rgb565; 58 uint32_t rgb888; 59 uint8_t r, g, b; 60 DisplaySurface *surface = qemu_console_surface(s->con); 61 int bpp = surface_bits_per_pixel(surface); 62 63 while (width--) { 64 switch (s->config.bpp) { 65 case 8: 66 /* lookup palette starting at video ram base 67 * TODO: cache translation, rather than doing this each time! 68 */ 69 rgb888 = ldl_le_phys(&s->dma_as, s->vcram_base + (*src << 2)); 70 r = (rgb888 >> 0) & 0xff; 71 g = (rgb888 >> 8) & 0xff; 72 b = (rgb888 >> 16) & 0xff; 73 src++; 74 break; 75 case 16: 76 rgb565 = lduw_le_p(src); 77 r = ((rgb565 >> 11) & 0x1f) << 3; 78 g = ((rgb565 >> 5) & 0x3f) << 2; 79 b = ((rgb565 >> 0) & 0x1f) << 3; 80 src += 2; 81 break; 82 case 24: 83 rgb888 = ldl_le_p(src); 84 r = (rgb888 >> 0) & 0xff; 85 g = (rgb888 >> 8) & 0xff; 86 b = (rgb888 >> 16) & 0xff; 87 src += 3; 88 break; 89 case 32: 90 rgb888 = ldl_le_p(src); 91 r = (rgb888 >> 0) & 0xff; 92 g = (rgb888 >> 8) & 0xff; 93 b = (rgb888 >> 16) & 0xff; 94 src += 4; 95 break; 96 default: 97 r = 0; 98 g = 0; 99 b = 0; 100 break; 101 } 102 103 if (s->config.pixo == 0) { 104 /* swap to BGR pixel format */ 105 uint8_t tmp = r; 106 r = b; 107 b = tmp; 108 } 109 110 switch (bpp) { 111 case 8: 112 *dst++ = rgb_to_pixel8(r, g, b); 113 break; 114 case 15: 115 *(uint16_t *)dst = rgb_to_pixel15(r, g, b); 116 dst += 2; 117 break; 118 case 16: 119 *(uint16_t *)dst = rgb_to_pixel16(r, g, b); 120 dst += 2; 121 break; 122 case 24: 123 rgb888 = rgb_to_pixel24(r, g, b); 124 *dst++ = rgb888 & 0xff; 125 *dst++ = (rgb888 >> 8) & 0xff; 126 *dst++ = (rgb888 >> 16) & 0xff; 127 break; 128 case 32: 129 *(uint32_t *)dst = rgb_to_pixel32(r, g, b); 130 dst += 4; 131 break; 132 default: 133 return; 134 } 135 } 136 } 137 138 static bool fb_use_offsets(BCM2835FBConfig *config) 139 { 140 /* 141 * Return true if we should use the viewport offsets. 142 * Experimentally, the hardware seems to do this only if the 143 * viewport size is larger than the physical screen. (It doesn't 144 * prevent the guest setting this silly viewport setting, though...) 145 */ 146 return config->xres_virtual > config->xres && 147 config->yres_virtual > config->yres; 148 } 149 150 static void fb_update_display(void *opaque) 151 { 152 BCM2835FBState *s = opaque; 153 DisplaySurface *surface = qemu_console_surface(s->con); 154 int first = 0; 155 int last = 0; 156 int src_width = 0; 157 int dest_width = 0; 158 uint32_t xoff = 0, yoff = 0; 159 160 if (s->lock || !s->config.xres) { 161 return; 162 } 163 164 src_width = bcm2835_fb_get_pitch(&s->config); 165 if (fb_use_offsets(&s->config)) { 166 xoff = s->config.xoffset; 167 yoff = s->config.yoffset; 168 } 169 170 dest_width = s->config.xres; 171 172 switch (surface_bits_per_pixel(surface)) { 173 case 0: 174 return; 175 case 8: 176 break; 177 case 15: 178 dest_width *= 2; 179 break; 180 case 16: 181 dest_width *= 2; 182 break; 183 case 24: 184 dest_width *= 3; 185 break; 186 case 32: 187 dest_width *= 4; 188 break; 189 default: 190 hw_error("bcm2835_fb: bad color depth\n"); 191 break; 192 } 193 194 if (s->invalidate) { 195 hwaddr base = s->config.base + xoff + (hwaddr)yoff * src_width; 196 framebuffer_update_memory_section(&s->fbsection, s->dma_mr, 197 base, 198 s->config.yres, src_width); 199 } 200 201 framebuffer_update_display(surface, &s->fbsection, 202 s->config.xres, s->config.yres, 203 src_width, dest_width, 0, s->invalidate, 204 draw_line_src16, s, &first, &last); 205 206 if (first >= 0) { 207 dpy_gfx_update(s->con, 0, first, s->config.xres, 208 last - first + 1); 209 } 210 211 s->invalidate = false; 212 } 213 214 void bcm2835_fb_validate_config(BCM2835FBConfig *config) 215 { 216 /* 217 * Validate the config, and clip any bogus values into range, 218 * as the hardware does. Note that fb_update_display() relies on 219 * this happening to prevent it from performing out-of-range 220 * accesses on redraw. 221 */ 222 config->xres = MIN(config->xres, XRES_MAX); 223 config->xres_virtual = MIN(config->xres_virtual, XRES_MAX); 224 config->yres = MIN(config->yres, YRES_MAX); 225 config->yres_virtual = MIN(config->yres_virtual, YRES_MAX); 226 227 /* 228 * These are not minima: a 40x40 framebuffer will be accepted. 229 * They're only used as defaults if the guest asks for zero size. 230 */ 231 if (config->xres == 0) { 232 config->xres = XRES_SMALL; 233 } 234 if (config->yres == 0) { 235 config->yres = YRES_SMALL; 236 } 237 if (config->xres_virtual == 0) { 238 config->xres_virtual = config->xres; 239 } 240 if (config->yres_virtual == 0) { 241 config->yres_virtual = config->yres; 242 } 243 244 if (fb_use_offsets(config)) { 245 /* Clip the offsets so the viewport is within the physical screen */ 246 config->xoffset = MIN(config->xoffset, 247 config->xres_virtual - config->xres); 248 config->yoffset = MIN(config->yoffset, 249 config->yres_virtual - config->yres); 250 } 251 } 252 253 void bcm2835_fb_reconfigure(BCM2835FBState *s, BCM2835FBConfig *newconfig) 254 { 255 s->lock = true; 256 257 s->config = *newconfig; 258 259 s->invalidate = true; 260 qemu_console_resize(s->con, s->config.xres, s->config.yres); 261 s->lock = false; 262 } 263 264 static void bcm2835_fb_mbox_push(BCM2835FBState *s, uint32_t value) 265 { 266 uint32_t pitch; 267 uint32_t size; 268 BCM2835FBConfig newconf; 269 270 value &= ~0xf; 271 272 newconf.xres = ldl_le_phys(&s->dma_as, value); 273 newconf.yres = ldl_le_phys(&s->dma_as, value + 4); 274 newconf.xres_virtual = ldl_le_phys(&s->dma_as, value + 8); 275 newconf.yres_virtual = ldl_le_phys(&s->dma_as, value + 12); 276 newconf.bpp = ldl_le_phys(&s->dma_as, value + 20); 277 newconf.xoffset = ldl_le_phys(&s->dma_as, value + 24); 278 newconf.yoffset = ldl_le_phys(&s->dma_as, value + 28); 279 280 newconf.base = s->vcram_base | (value & 0xc0000000); 281 newconf.base += BCM2835_FB_OFFSET; 282 283 bcm2835_fb_validate_config(&newconf); 284 285 pitch = bcm2835_fb_get_pitch(&newconf); 286 size = bcm2835_fb_get_size(&newconf); 287 288 stl_le_phys(&s->dma_as, value + 16, pitch); 289 stl_le_phys(&s->dma_as, value + 32, newconf.base); 290 stl_le_phys(&s->dma_as, value + 36, size); 291 292 bcm2835_fb_reconfigure(s, &newconf); 293 } 294 295 static uint64_t bcm2835_fb_read(void *opaque, hwaddr offset, unsigned size) 296 { 297 BCM2835FBState *s = opaque; 298 uint32_t res = 0; 299 300 switch (offset) { 301 case MBOX_AS_DATA: 302 res = MBOX_CHAN_FB; 303 s->pending = false; 304 qemu_set_irq(s->mbox_irq, 0); 305 break; 306 307 case MBOX_AS_PENDING: 308 res = s->pending; 309 break; 310 311 default: 312 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n", 313 __func__, offset); 314 return 0; 315 } 316 317 return res; 318 } 319 320 static void bcm2835_fb_write(void *opaque, hwaddr offset, uint64_t value, 321 unsigned size) 322 { 323 BCM2835FBState *s = opaque; 324 325 switch (offset) { 326 case MBOX_AS_DATA: 327 /* bcm2835_mbox should check our pending status before pushing */ 328 assert(!s->pending); 329 s->pending = true; 330 bcm2835_fb_mbox_push(s, value); 331 qemu_set_irq(s->mbox_irq, 1); 332 break; 333 334 default: 335 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n", 336 __func__, offset); 337 return; 338 } 339 } 340 341 static const MemoryRegionOps bcm2835_fb_ops = { 342 .read = bcm2835_fb_read, 343 .write = bcm2835_fb_write, 344 .endianness = DEVICE_NATIVE_ENDIAN, 345 .valid.min_access_size = 4, 346 .valid.max_access_size = 4, 347 }; 348 349 static const VMStateDescription vmstate_bcm2835_fb = { 350 .name = TYPE_BCM2835_FB, 351 .version_id = 1, 352 .minimum_version_id = 1, 353 .fields = (VMStateField[]) { 354 VMSTATE_BOOL(lock, BCM2835FBState), 355 VMSTATE_BOOL(invalidate, BCM2835FBState), 356 VMSTATE_BOOL(pending, BCM2835FBState), 357 VMSTATE_UINT32(config.xres, BCM2835FBState), 358 VMSTATE_UINT32(config.yres, BCM2835FBState), 359 VMSTATE_UINT32(config.xres_virtual, BCM2835FBState), 360 VMSTATE_UINT32(config.yres_virtual, BCM2835FBState), 361 VMSTATE_UINT32(config.xoffset, BCM2835FBState), 362 VMSTATE_UINT32(config.yoffset, BCM2835FBState), 363 VMSTATE_UINT32(config.bpp, BCM2835FBState), 364 VMSTATE_UINT32(config.base, BCM2835FBState), 365 VMSTATE_UNUSED(8), /* Was pitch and size */ 366 VMSTATE_UINT32(config.pixo, BCM2835FBState), 367 VMSTATE_UINT32(config.alpha, BCM2835FBState), 368 VMSTATE_END_OF_LIST() 369 } 370 }; 371 372 static const GraphicHwOps vgafb_ops = { 373 .invalidate = fb_invalidate_display, 374 .gfx_update = fb_update_display, 375 }; 376 377 static void bcm2835_fb_init(Object *obj) 378 { 379 BCM2835FBState *s = BCM2835_FB(obj); 380 381 memory_region_init_io(&s->iomem, obj, &bcm2835_fb_ops, s, TYPE_BCM2835_FB, 382 0x10); 383 sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem); 384 sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq); 385 } 386 387 static void bcm2835_fb_reset(DeviceState *dev) 388 { 389 BCM2835FBState *s = BCM2835_FB(dev); 390 391 s->pending = false; 392 393 s->config = s->initial_config; 394 395 s->invalidate = true; 396 s->lock = false; 397 } 398 399 static void bcm2835_fb_realize(DeviceState *dev, Error **errp) 400 { 401 BCM2835FBState *s = BCM2835_FB(dev); 402 Error *err = NULL; 403 Object *obj; 404 405 if (s->vcram_base == 0) { 406 error_setg(errp, "%s: required vcram-base property not set", __func__); 407 return; 408 } 409 410 obj = object_property_get_link(OBJECT(dev), "dma-mr", &err); 411 if (obj == NULL) { 412 error_setg(errp, "%s: required dma-mr link not found: %s", 413 __func__, error_get_pretty(err)); 414 return; 415 } 416 417 /* Fill in the parts of initial_config that are not set by QOM properties */ 418 s->initial_config.xres_virtual = s->initial_config.xres; 419 s->initial_config.yres_virtual = s->initial_config.yres; 420 s->initial_config.xoffset = 0; 421 s->initial_config.yoffset = 0; 422 s->initial_config.base = s->vcram_base + BCM2835_FB_OFFSET; 423 424 s->dma_mr = MEMORY_REGION(obj); 425 address_space_init(&s->dma_as, s->dma_mr, NULL); 426 427 bcm2835_fb_reset(dev); 428 429 s->con = graphic_console_init(dev, 0, &vgafb_ops, s); 430 qemu_console_resize(s->con, s->config.xres, s->config.yres); 431 } 432 433 static Property bcm2835_fb_props[] = { 434 DEFINE_PROP_UINT32("vcram-base", BCM2835FBState, vcram_base, 0),/*required*/ 435 DEFINE_PROP_UINT32("vcram-size", BCM2835FBState, vcram_size, 436 DEFAULT_VCRAM_SIZE), 437 DEFINE_PROP_UINT32("xres", BCM2835FBState, initial_config.xres, 640), 438 DEFINE_PROP_UINT32("yres", BCM2835FBState, initial_config.yres, 480), 439 DEFINE_PROP_UINT32("bpp", BCM2835FBState, initial_config.bpp, 16), 440 DEFINE_PROP_UINT32("pixo", BCM2835FBState, 441 initial_config.pixo, 1), /* 1=RGB, 0=BGR */ 442 DEFINE_PROP_UINT32("alpha", BCM2835FBState, 443 initial_config.alpha, 2), /* alpha ignored */ 444 DEFINE_PROP_END_OF_LIST() 445 }; 446 447 static void bcm2835_fb_class_init(ObjectClass *klass, void *data) 448 { 449 DeviceClass *dc = DEVICE_CLASS(klass); 450 451 dc->props = bcm2835_fb_props; 452 dc->realize = bcm2835_fb_realize; 453 dc->reset = bcm2835_fb_reset; 454 dc->vmsd = &vmstate_bcm2835_fb; 455 } 456 457 static TypeInfo bcm2835_fb_info = { 458 .name = TYPE_BCM2835_FB, 459 .parent = TYPE_SYS_BUS_DEVICE, 460 .instance_size = sizeof(BCM2835FBState), 461 .class_init = bcm2835_fb_class_init, 462 .instance_init = bcm2835_fb_init, 463 }; 464 465 static void bcm2835_fb_register_types(void) 466 { 467 type_register_static(&bcm2835_fb_info); 468 } 469 470 type_init(bcm2835_fb_register_types) 471