bcm2835_fb.c (14081B)
1 /* 2 * Raspberry Pi emulation (c) 2012 Gregory Estrade 3 * Refactoring for Pi2 Copyright (c) 2015, Microsoft. Written by Andrew Baumann. 4 * 5 * Heavily based on milkymist-vgafb.c, copyright terms below: 6 * QEMU model of the Milkymist VGA framebuffer. 7 * 8 * Copyright (c) 2010-2012 Michael Walle <michael@walle.cc> 9 * 10 * This library is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2.1 of the License, or (at your option) any later version. 14 * 15 * This library is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 22 * 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qapi/error.h" 27 #include "hw/display/bcm2835_fb.h" 28 #include "hw/hw.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 "hw/qdev-properties.h" 34 #include "migration/vmstate.h" 35 #include "qemu/log.h" 36 #include "qemu/module.h" 37 38 #define DEFAULT_VCRAM_SIZE 0x4000000 39 #define BCM2835_FB_OFFSET 0x00100000 40 41 /* Maximum permitted framebuffer size; experimentally determined on an rpi2 */ 42 #define XRES_MAX 3840 43 #define YRES_MAX 2560 44 /* Framebuffer size used if guest requests zero size */ 45 #define XRES_SMALL 592 46 #define YRES_SMALL 488 47 48 static void fb_invalidate_display(void *opaque) 49 { 50 BCM2835FBState *s = BCM2835_FB(opaque); 51 52 s->invalidate = true; 53 } 54 55 static void draw_line_src16(void *opaque, uint8_t *dst, const uint8_t *src, 56 int width, int deststep) 57 { 58 BCM2835FBState *s = opaque; 59 uint16_t rgb565; 60 uint32_t rgb888; 61 uint8_t r, g, b; 62 DisplaySurface *surface = qemu_console_surface(s->con); 63 int bpp = surface_bits_per_pixel(surface); 64 65 while (width--) { 66 switch (s->config.bpp) { 67 case 8: 68 /* lookup palette starting at video ram base 69 * TODO: cache translation, rather than doing this each time! 70 */ 71 rgb888 = ldl_le_phys(&s->dma_as, s->vcram_base + (*src << 2)); 72 r = (rgb888 >> 0) & 0xff; 73 g = (rgb888 >> 8) & 0xff; 74 b = (rgb888 >> 16) & 0xff; 75 src++; 76 break; 77 case 16: 78 rgb565 = lduw_le_p(src); 79 r = ((rgb565 >> 11) & 0x1f) << 3; 80 g = ((rgb565 >> 5) & 0x3f) << 2; 81 b = ((rgb565 >> 0) & 0x1f) << 3; 82 src += 2; 83 break; 84 case 24: 85 rgb888 = ldl_le_p(src); 86 r = (rgb888 >> 0) & 0xff; 87 g = (rgb888 >> 8) & 0xff; 88 b = (rgb888 >> 16) & 0xff; 89 src += 3; 90 break; 91 case 32: 92 rgb888 = ldl_le_p(src); 93 r = (rgb888 >> 0) & 0xff; 94 g = (rgb888 >> 8) & 0xff; 95 b = (rgb888 >> 16) & 0xff; 96 src += 4; 97 break; 98 default: 99 r = 0; 100 g = 0; 101 b = 0; 102 break; 103 } 104 105 if (s->config.pixo == 0) { 106 /* swap to BGR pixel format */ 107 uint8_t tmp = r; 108 r = b; 109 b = tmp; 110 } 111 112 switch (bpp) { 113 case 8: 114 *dst++ = rgb_to_pixel8(r, g, b); 115 break; 116 case 15: 117 *(uint16_t *)dst = rgb_to_pixel15(r, g, b); 118 dst += 2; 119 break; 120 case 16: 121 *(uint16_t *)dst = rgb_to_pixel16(r, g, b); 122 dst += 2; 123 break; 124 case 24: 125 rgb888 = rgb_to_pixel24(r, g, b); 126 *dst++ = rgb888 & 0xff; 127 *dst++ = (rgb888 >> 8) & 0xff; 128 *dst++ = (rgb888 >> 16) & 0xff; 129 break; 130 case 32: 131 *(uint32_t *)dst = rgb_to_pixel32(r, g, b); 132 dst += 4; 133 break; 134 default: 135 return; 136 } 137 } 138 } 139 140 static bool fb_use_offsets(BCM2835FBConfig *config) 141 { 142 /* 143 * Return true if we should use the viewport offsets. 144 * Experimentally, the hardware seems to do this only if the 145 * viewport size is larger than the physical screen. (It doesn't 146 * prevent the guest setting this silly viewport setting, though...) 147 */ 148 return config->xres_virtual > config->xres && 149 config->yres_virtual > config->yres; 150 } 151 152 static void fb_update_display(void *opaque) 153 { 154 BCM2835FBState *s = opaque; 155 DisplaySurface *surface = qemu_console_surface(s->con); 156 int first = 0; 157 int last = 0; 158 int src_width = 0; 159 int dest_width = 0; 160 uint32_t xoff = 0, yoff = 0; 161 162 if (s->lock || !s->config.xres) { 163 return; 164 } 165 166 src_width = bcm2835_fb_get_pitch(&s->config); 167 if (fb_use_offsets(&s->config)) { 168 xoff = s->config.xoffset; 169 yoff = s->config.yoffset; 170 } 171 172 dest_width = s->config.xres; 173 174 switch (surface_bits_per_pixel(surface)) { 175 case 0: 176 return; 177 case 8: 178 break; 179 case 15: 180 dest_width *= 2; 181 break; 182 case 16: 183 dest_width *= 2; 184 break; 185 case 24: 186 dest_width *= 3; 187 break; 188 case 32: 189 dest_width *= 4; 190 break; 191 default: 192 hw_error("bcm2835_fb: bad color depth\n"); 193 break; 194 } 195 196 if (s->invalidate) { 197 hwaddr base = s->config.base + xoff + (hwaddr)yoff * src_width; 198 framebuffer_update_memory_section(&s->fbsection, s->dma_mr, 199 base, 200 s->config.yres, src_width); 201 } 202 203 framebuffer_update_display(surface, &s->fbsection, 204 s->config.xres, s->config.yres, 205 src_width, dest_width, 0, s->invalidate, 206 draw_line_src16, s, &first, &last); 207 208 if (first >= 0) { 209 dpy_gfx_update(s->con, 0, first, s->config.xres, 210 last - first + 1); 211 } 212 213 s->invalidate = false; 214 } 215 216 void bcm2835_fb_validate_config(BCM2835FBConfig *config) 217 { 218 /* 219 * Validate the config, and clip any bogus values into range, 220 * as the hardware does. Note that fb_update_display() relies on 221 * this happening to prevent it from performing out-of-range 222 * accesses on redraw. 223 */ 224 config->xres = MIN(config->xres, XRES_MAX); 225 config->xres_virtual = MIN(config->xres_virtual, XRES_MAX); 226 config->yres = MIN(config->yres, YRES_MAX); 227 config->yres_virtual = MIN(config->yres_virtual, YRES_MAX); 228 229 /* 230 * These are not minima: a 40x40 framebuffer will be accepted. 231 * They're only used as defaults if the guest asks for zero size. 232 */ 233 if (config->xres == 0) { 234 config->xres = XRES_SMALL; 235 } 236 if (config->yres == 0) { 237 config->yres = YRES_SMALL; 238 } 239 if (config->xres_virtual == 0) { 240 config->xres_virtual = config->xres; 241 } 242 if (config->yres_virtual == 0) { 243 config->yres_virtual = config->yres; 244 } 245 246 if (fb_use_offsets(config)) { 247 /* Clip the offsets so the viewport is within the physical screen */ 248 config->xoffset = MIN(config->xoffset, 249 config->xres_virtual - config->xres); 250 config->yoffset = MIN(config->yoffset, 251 config->yres_virtual - config->yres); 252 } 253 } 254 255 void bcm2835_fb_reconfigure(BCM2835FBState *s, BCM2835FBConfig *newconfig) 256 { 257 s->lock = true; 258 259 s->config = *newconfig; 260 261 s->invalidate = true; 262 qemu_console_resize(s->con, s->config.xres, s->config.yres); 263 s->lock = false; 264 } 265 266 static void bcm2835_fb_mbox_push(BCM2835FBState *s, uint32_t value) 267 { 268 uint32_t pitch; 269 uint32_t size; 270 BCM2835FBConfig newconf; 271 272 value &= ~0xf; 273 274 newconf.xres = ldl_le_phys(&s->dma_as, value); 275 newconf.yres = ldl_le_phys(&s->dma_as, value + 4); 276 newconf.xres_virtual = ldl_le_phys(&s->dma_as, value + 8); 277 newconf.yres_virtual = ldl_le_phys(&s->dma_as, value + 12); 278 newconf.bpp = ldl_le_phys(&s->dma_as, value + 20); 279 newconf.xoffset = ldl_le_phys(&s->dma_as, value + 24); 280 newconf.yoffset = ldl_le_phys(&s->dma_as, value + 28); 281 282 newconf.base = s->vcram_base + BCM2835_FB_OFFSET; 283 284 /* Copy fields which we don't want to change from the existing config */ 285 newconf.pixo = s->config.pixo; 286 newconf.alpha = s->config.alpha; 287 288 bcm2835_fb_validate_config(&newconf); 289 290 pitch = bcm2835_fb_get_pitch(&newconf); 291 size = bcm2835_fb_get_size(&newconf); 292 293 stl_le_phys(&s->dma_as, value + 16, pitch); 294 stl_le_phys(&s->dma_as, value + 32, newconf.base); 295 stl_le_phys(&s->dma_as, value + 36, size); 296 297 bcm2835_fb_reconfigure(s, &newconf); 298 } 299 300 static uint64_t bcm2835_fb_read(void *opaque, hwaddr offset, unsigned size) 301 { 302 BCM2835FBState *s = opaque; 303 uint32_t res = 0; 304 305 switch (offset) { 306 case MBOX_AS_DATA: 307 res = MBOX_CHAN_FB; 308 s->pending = false; 309 qemu_set_irq(s->mbox_irq, 0); 310 break; 311 312 case MBOX_AS_PENDING: 313 res = s->pending; 314 break; 315 316 default: 317 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n", 318 __func__, offset); 319 return 0; 320 } 321 322 return res; 323 } 324 325 static void bcm2835_fb_write(void *opaque, hwaddr offset, uint64_t value, 326 unsigned size) 327 { 328 BCM2835FBState *s = opaque; 329 330 switch (offset) { 331 case MBOX_AS_DATA: 332 /* bcm2835_mbox should check our pending status before pushing */ 333 assert(!s->pending); 334 s->pending = true; 335 bcm2835_fb_mbox_push(s, value); 336 qemu_set_irq(s->mbox_irq, 1); 337 break; 338 339 default: 340 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n", 341 __func__, offset); 342 return; 343 } 344 } 345 346 static const MemoryRegionOps bcm2835_fb_ops = { 347 .read = bcm2835_fb_read, 348 .write = bcm2835_fb_write, 349 .endianness = DEVICE_NATIVE_ENDIAN, 350 .valid.min_access_size = 4, 351 .valid.max_access_size = 4, 352 }; 353 354 static const VMStateDescription vmstate_bcm2835_fb = { 355 .name = TYPE_BCM2835_FB, 356 .version_id = 1, 357 .minimum_version_id = 1, 358 .fields = (VMStateField[]) { 359 VMSTATE_BOOL(lock, BCM2835FBState), 360 VMSTATE_BOOL(invalidate, BCM2835FBState), 361 VMSTATE_BOOL(pending, BCM2835FBState), 362 VMSTATE_UINT32(config.xres, BCM2835FBState), 363 VMSTATE_UINT32(config.yres, BCM2835FBState), 364 VMSTATE_UINT32(config.xres_virtual, BCM2835FBState), 365 VMSTATE_UINT32(config.yres_virtual, BCM2835FBState), 366 VMSTATE_UINT32(config.xoffset, BCM2835FBState), 367 VMSTATE_UINT32(config.yoffset, BCM2835FBState), 368 VMSTATE_UINT32(config.bpp, BCM2835FBState), 369 VMSTATE_UINT32(config.base, BCM2835FBState), 370 VMSTATE_UNUSED(8), /* Was pitch and size */ 371 VMSTATE_UINT32(config.pixo, BCM2835FBState), 372 VMSTATE_UINT32(config.alpha, BCM2835FBState), 373 VMSTATE_END_OF_LIST() 374 } 375 }; 376 377 static const GraphicHwOps vgafb_ops = { 378 .invalidate = fb_invalidate_display, 379 .gfx_update = fb_update_display, 380 }; 381 382 static void bcm2835_fb_init(Object *obj) 383 { 384 BCM2835FBState *s = BCM2835_FB(obj); 385 386 memory_region_init_io(&s->iomem, obj, &bcm2835_fb_ops, s, TYPE_BCM2835_FB, 387 0x10); 388 sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem); 389 sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq); 390 } 391 392 static void bcm2835_fb_reset(DeviceState *dev) 393 { 394 BCM2835FBState *s = BCM2835_FB(dev); 395 396 s->pending = false; 397 398 s->config = s->initial_config; 399 400 s->invalidate = true; 401 s->lock = false; 402 } 403 404 static void bcm2835_fb_realize(DeviceState *dev, Error **errp) 405 { 406 BCM2835FBState *s = BCM2835_FB(dev); 407 Object *obj; 408 409 if (s->vcram_base == 0) { 410 error_setg(errp, "%s: required vcram-base property not set", __func__); 411 return; 412 } 413 414 obj = object_property_get_link(OBJECT(dev), "dma-mr", &error_abort); 415 416 /* Fill in the parts of initial_config that are not set by QOM properties */ 417 s->initial_config.xres_virtual = s->initial_config.xres; 418 s->initial_config.yres_virtual = s->initial_config.yres; 419 s->initial_config.xoffset = 0; 420 s->initial_config.yoffset = 0; 421 s->initial_config.base = s->vcram_base + BCM2835_FB_OFFSET; 422 423 s->dma_mr = MEMORY_REGION(obj); 424 address_space_init(&s->dma_as, s->dma_mr, TYPE_BCM2835_FB "-memory"); 425 426 bcm2835_fb_reset(dev); 427 428 s->con = graphic_console_init(dev, 0, &vgafb_ops, s); 429 qemu_console_resize(s->con, s->config.xres, s->config.yres); 430 } 431 432 static Property bcm2835_fb_props[] = { 433 DEFINE_PROP_UINT32("vcram-base", BCM2835FBState, vcram_base, 0),/*required*/ 434 DEFINE_PROP_UINT32("vcram-size", BCM2835FBState, vcram_size, 435 DEFAULT_VCRAM_SIZE), 436 DEFINE_PROP_UINT32("xres", BCM2835FBState, initial_config.xres, 640), 437 DEFINE_PROP_UINT32("yres", BCM2835FBState, initial_config.yres, 480), 438 DEFINE_PROP_UINT32("bpp", BCM2835FBState, initial_config.bpp, 16), 439 DEFINE_PROP_UINT32("pixo", BCM2835FBState, 440 initial_config.pixo, 1), /* 1=RGB, 0=BGR */ 441 DEFINE_PROP_UINT32("alpha", BCM2835FBState, 442 initial_config.alpha, 2), /* alpha ignored */ 443 DEFINE_PROP_END_OF_LIST() 444 }; 445 446 static void bcm2835_fb_class_init(ObjectClass *klass, void *data) 447 { 448 DeviceClass *dc = DEVICE_CLASS(klass); 449 450 device_class_set_props(dc, bcm2835_fb_props); 451 dc->realize = bcm2835_fb_realize; 452 dc->reset = bcm2835_fb_reset; 453 dc->vmsd = &vmstate_bcm2835_fb; 454 } 455 456 static const TypeInfo bcm2835_fb_info = { 457 .name = TYPE_BCM2835_FB, 458 .parent = TYPE_SYS_BUS_DEVICE, 459 .instance_size = sizeof(BCM2835FBState), 460 .class_init = bcm2835_fb_class_init, 461 .instance_init = bcm2835_fb_init, 462 }; 463 464 static void bcm2835_fb_register_types(void) 465 { 466 type_register_static(&bcm2835_fb_info); 467 } 468 469 type_init(bcm2835_fb_register_types)