1 /* 2 * QEMU CG3 Frame buffer 3 * 4 * Copyright (c) 2012 Bob Breuer 5 * Copyright (c) 2013 Mark Cave-Ayland 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qemu-common.h" 28 #include "qapi/error.h" 29 #include "qemu/error-report.h" 30 #include "ui/console.h" 31 #include "hw/sysbus.h" 32 #include "migration/vmstate.h" 33 #include "hw/irq.h" 34 #include "hw/loader.h" 35 #include "hw/qdev-properties.h" 36 #include "qemu/log.h" 37 #include "qemu/module.h" 38 39 /* Change to 1 to enable debugging */ 40 #define DEBUG_CG3 0 41 42 #define CG3_ROM_FILE "QEMU,cgthree.bin" 43 #define FCODE_MAX_ROM_SIZE 0x10000 44 45 #define CG3_REG_SIZE 0x20 46 47 #define CG3_REG_BT458_ADDR 0x0 48 #define CG3_REG_BT458_COLMAP 0x4 49 #define CG3_REG_FBC_CTRL 0x10 50 #define CG3_REG_FBC_STATUS 0x11 51 #define CG3_REG_FBC_CURSTART 0x12 52 #define CG3_REG_FBC_CUREND 0x13 53 #define CG3_REG_FBC_VCTRL 0x14 54 55 /* Control register flags */ 56 #define CG3_CR_ENABLE_INTS 0x80 57 58 /* Status register flags */ 59 #define CG3_SR_PENDING_INT 0x80 60 #define CG3_SR_1152_900_76_B 0x60 61 #define CG3_SR_ID_COLOR 0x01 62 63 #define CG3_VRAM_SIZE 0x100000 64 #define CG3_VRAM_OFFSET 0x800000 65 66 #define DPRINTF(fmt, ...) do { \ 67 if (DEBUG_CG3) { \ 68 printf("CG3: " fmt , ## __VA_ARGS__); \ 69 } \ 70 } while (0) 71 72 #define TYPE_CG3 "cgthree" 73 #define CG3(obj) OBJECT_CHECK(CG3State, (obj), TYPE_CG3) 74 75 typedef struct CG3State { 76 SysBusDevice parent_obj; 77 78 QemuConsole *con; 79 qemu_irq irq; 80 hwaddr prom_addr; 81 MemoryRegion vram_mem; 82 MemoryRegion rom; 83 MemoryRegion reg; 84 uint32_t vram_size; 85 int full_update; 86 uint8_t regs[16]; 87 uint8_t r[256], g[256], b[256]; 88 uint16_t width, height, depth; 89 uint8_t dac_index, dac_state; 90 } CG3State; 91 92 static void cg3_update_display(void *opaque) 93 { 94 CG3State *s = opaque; 95 DisplaySurface *surface = qemu_console_surface(s->con); 96 const uint8_t *pix; 97 uint32_t *data; 98 uint32_t dval; 99 int x, y, y_start; 100 unsigned int width, height; 101 ram_addr_t page; 102 DirtyBitmapSnapshot *snap = NULL; 103 104 if (surface_bits_per_pixel(surface) != 32) { 105 return; 106 } 107 width = s->width; 108 height = s->height; 109 110 y_start = -1; 111 pix = memory_region_get_ram_ptr(&s->vram_mem); 112 data = (uint32_t *)surface_data(surface); 113 114 if (!s->full_update) { 115 snap = memory_region_snapshot_and_clear_dirty(&s->vram_mem, 0x0, 116 memory_region_size(&s->vram_mem), 117 DIRTY_MEMORY_VGA); 118 } 119 120 for (y = 0; y < height; y++) { 121 int update; 122 123 page = (ram_addr_t)y * width; 124 125 if (s->full_update) { 126 update = 1; 127 } else { 128 update = memory_region_snapshot_get_dirty(&s->vram_mem, snap, page, 129 width); 130 } 131 132 if (update) { 133 if (y_start < 0) { 134 y_start = y; 135 } 136 137 for (x = 0; x < width; x++) { 138 dval = *pix++; 139 dval = (s->r[dval] << 16) | (s->g[dval] << 8) | s->b[dval]; 140 *data++ = dval; 141 } 142 } else { 143 if (y_start >= 0) { 144 dpy_gfx_update(s->con, 0, y_start, width, y - y_start); 145 y_start = -1; 146 } 147 pix += width; 148 data += width; 149 } 150 } 151 s->full_update = 0; 152 if (y_start >= 0) { 153 dpy_gfx_update(s->con, 0, y_start, width, y - y_start); 154 } 155 /* vsync interrupt? */ 156 if (s->regs[0] & CG3_CR_ENABLE_INTS) { 157 s->regs[1] |= CG3_SR_PENDING_INT; 158 qemu_irq_raise(s->irq); 159 } 160 g_free(snap); 161 } 162 163 static void cg3_invalidate_display(void *opaque) 164 { 165 CG3State *s = opaque; 166 167 memory_region_set_dirty(&s->vram_mem, 0, CG3_VRAM_SIZE); 168 } 169 170 static uint64_t cg3_reg_read(void *opaque, hwaddr addr, unsigned size) 171 { 172 CG3State *s = opaque; 173 int val; 174 175 switch (addr) { 176 case CG3_REG_BT458_ADDR: 177 case CG3_REG_BT458_COLMAP: 178 val = 0; 179 break; 180 case CG3_REG_FBC_CTRL: 181 val = s->regs[0]; 182 break; 183 case CG3_REG_FBC_STATUS: 184 /* monitor ID 6, board type = 1 (color) */ 185 val = s->regs[1] | CG3_SR_1152_900_76_B | CG3_SR_ID_COLOR; 186 break; 187 case CG3_REG_FBC_CURSTART ... CG3_REG_SIZE - 1: 188 val = s->regs[addr - 0x10]; 189 break; 190 default: 191 qemu_log_mask(LOG_UNIMP, 192 "cg3: Unimplemented register read " 193 "reg 0x%" HWADDR_PRIx " size 0x%x\n", 194 addr, size); 195 val = 0; 196 break; 197 } 198 DPRINTF("read %02x from reg %" HWADDR_PRIx "\n", val, addr); 199 return val; 200 } 201 202 static void cg3_reg_write(void *opaque, hwaddr addr, uint64_t val, 203 unsigned size) 204 { 205 CG3State *s = opaque; 206 uint8_t regval; 207 int i; 208 209 DPRINTF("write %" PRIx64 " to reg %" HWADDR_PRIx " size %d\n", 210 val, addr, size); 211 212 switch (addr) { 213 case CG3_REG_BT458_ADDR: 214 s->dac_index = val; 215 s->dac_state = 0; 216 break; 217 case CG3_REG_BT458_COLMAP: 218 /* This register can be written to as either a long word or a byte */ 219 if (size == 1) { 220 val <<= 24; 221 } 222 223 for (i = 0; i < size; i++) { 224 regval = val >> 24; 225 226 switch (s->dac_state) { 227 case 0: 228 s->r[s->dac_index] = regval; 229 s->dac_state++; 230 break; 231 case 1: 232 s->g[s->dac_index] = regval; 233 s->dac_state++; 234 break; 235 case 2: 236 s->b[s->dac_index] = regval; 237 /* Index autoincrement */ 238 s->dac_index = (s->dac_index + 1) & 0xff; 239 /* fall through */ 240 default: 241 s->dac_state = 0; 242 break; 243 } 244 val <<= 8; 245 } 246 s->full_update = 1; 247 break; 248 case CG3_REG_FBC_CTRL: 249 s->regs[0] = val; 250 break; 251 case CG3_REG_FBC_STATUS: 252 if (s->regs[1] & CG3_SR_PENDING_INT) { 253 /* clear interrupt */ 254 s->regs[1] &= ~CG3_SR_PENDING_INT; 255 qemu_irq_lower(s->irq); 256 } 257 break; 258 case CG3_REG_FBC_CURSTART ... CG3_REG_SIZE - 1: 259 s->regs[addr - 0x10] = val; 260 break; 261 default: 262 qemu_log_mask(LOG_UNIMP, 263 "cg3: Unimplemented register write " 264 "reg 0x%" HWADDR_PRIx " size 0x%x value 0x%" PRIx64 "\n", 265 addr, size, val); 266 break; 267 } 268 } 269 270 static const MemoryRegionOps cg3_reg_ops = { 271 .read = cg3_reg_read, 272 .write = cg3_reg_write, 273 .endianness = DEVICE_NATIVE_ENDIAN, 274 .valid = { 275 .min_access_size = 1, 276 .max_access_size = 4, 277 }, 278 }; 279 280 static const GraphicHwOps cg3_ops = { 281 .invalidate = cg3_invalidate_display, 282 .gfx_update = cg3_update_display, 283 }; 284 285 static void cg3_initfn(Object *obj) 286 { 287 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 288 CG3State *s = CG3(obj); 289 290 memory_region_init_rom_nomigrate(&s->rom, obj, "cg3.prom", 291 FCODE_MAX_ROM_SIZE, &error_fatal); 292 sysbus_init_mmio(sbd, &s->rom); 293 294 memory_region_init_io(&s->reg, obj, &cg3_reg_ops, s, "cg3.reg", 295 CG3_REG_SIZE); 296 sysbus_init_mmio(sbd, &s->reg); 297 } 298 299 static void cg3_realizefn(DeviceState *dev, Error **errp) 300 { 301 SysBusDevice *sbd = SYS_BUS_DEVICE(dev); 302 CG3State *s = CG3(dev); 303 int ret; 304 char *fcode_filename; 305 306 /* FCode ROM */ 307 vmstate_register_ram_global(&s->rom); 308 fcode_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, CG3_ROM_FILE); 309 if (fcode_filename) { 310 ret = load_image_mr(fcode_filename, &s->rom); 311 g_free(fcode_filename); 312 if (ret < 0 || ret > FCODE_MAX_ROM_SIZE) { 313 warn_report("cg3: could not load prom '%s'", CG3_ROM_FILE); 314 } 315 } 316 317 memory_region_init_ram(&s->vram_mem, NULL, "cg3.vram", s->vram_size, 318 &error_fatal); 319 memory_region_set_log(&s->vram_mem, true, DIRTY_MEMORY_VGA); 320 sysbus_init_mmio(sbd, &s->vram_mem); 321 322 sysbus_init_irq(sbd, &s->irq); 323 324 s->con = graphic_console_init(dev, 0, &cg3_ops, s); 325 qemu_console_resize(s->con, s->width, s->height); 326 } 327 328 static int vmstate_cg3_post_load(void *opaque, int version_id) 329 { 330 CG3State *s = opaque; 331 332 cg3_invalidate_display(s); 333 334 return 0; 335 } 336 337 static const VMStateDescription vmstate_cg3 = { 338 .name = "cg3", 339 .version_id = 1, 340 .minimum_version_id = 1, 341 .post_load = vmstate_cg3_post_load, 342 .fields = (VMStateField[]) { 343 VMSTATE_UINT16(height, CG3State), 344 VMSTATE_UINT16(width, CG3State), 345 VMSTATE_UINT16(depth, CG3State), 346 VMSTATE_BUFFER(r, CG3State), 347 VMSTATE_BUFFER(g, CG3State), 348 VMSTATE_BUFFER(b, CG3State), 349 VMSTATE_UINT8(dac_index, CG3State), 350 VMSTATE_UINT8(dac_state, CG3State), 351 VMSTATE_END_OF_LIST() 352 } 353 }; 354 355 static void cg3_reset(DeviceState *d) 356 { 357 CG3State *s = CG3(d); 358 359 /* Initialize palette */ 360 memset(s->r, 0, 256); 361 memset(s->g, 0, 256); 362 memset(s->b, 0, 256); 363 364 s->dac_state = 0; 365 s->full_update = 1; 366 qemu_irq_lower(s->irq); 367 } 368 369 static Property cg3_properties[] = { 370 DEFINE_PROP_UINT32("vram-size", CG3State, vram_size, -1), 371 DEFINE_PROP_UINT16("width", CG3State, width, -1), 372 DEFINE_PROP_UINT16("height", CG3State, height, -1), 373 DEFINE_PROP_UINT16("depth", CG3State, depth, -1), 374 DEFINE_PROP_END_OF_LIST(), 375 }; 376 377 static void cg3_class_init(ObjectClass *klass, void *data) 378 { 379 DeviceClass *dc = DEVICE_CLASS(klass); 380 381 dc->realize = cg3_realizefn; 382 dc->reset = cg3_reset; 383 dc->vmsd = &vmstate_cg3; 384 device_class_set_props(dc, cg3_properties); 385 } 386 387 static const TypeInfo cg3_info = { 388 .name = TYPE_CG3, 389 .parent = TYPE_SYS_BUS_DEVICE, 390 .instance_size = sizeof(CG3State), 391 .instance_init = cg3_initfn, 392 .class_init = cg3_class_init, 393 }; 394 395 static void cg3_register_types(void) 396 { 397 type_register_static(&cg3_info); 398 } 399 400 type_init(cg3_register_types) 401