hw/display/cg3.c

   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-common.h"
  27 #include "qemu/error-report.h"
  28 #include "ui/console.h"
  29 #include "hw/sysbus.h"
  30 #include "hw/loader.h"
  31
  32 /* Change to 1 to enable debugging */
  33 #define DEBUG_CG3 0
  34
  35 #define CG3_ROM_FILE  "QEMU,cgthree.bin"
  36 #define FCODE_MAX_ROM_SIZE 0x10000
  37
  38 #define CG3_REG_SIZE            0x20
  39
  40 #define CG3_REG_BT458_ADDR      0x0
  41 #define CG3_REG_BT458_COLMAP    0x4
  42 #define CG3_REG_FBC_CTRL        0x10
  43 #define CG3_REG_FBC_STATUS      0x11
  44 #define CG3_REG_FBC_CURSTART    0x12
  45 #define CG3_REG_FBC_CUREND      0x13
  46 #define CG3_REG_FBC_VCTRL       0x14
  47
  48 /* Control register flags */
  49 #define CG3_CR_ENABLE_INTS      0x80
  50
  51 /* Status register flags */
  52 #define CG3_SR_PENDING_INT      0x80
  53 #define CG3_SR_1152_900_76_B    0x60
  54 #define CG3_SR_ID_COLOR         0x01
  55
  56 #define CG3_VRAM_SIZE 0x100000
  57 #define CG3_VRAM_OFFSET 0x800000
  58
  59 #define DPRINTF(fmt, ...) do { \
  60     if (DEBUG_CG3) { \
  61         printf("CG3: " fmt , ## __VA_ARGS__); \
  62     } \
  63 } while (0);
  64
  65 #define TYPE_CG3 "cgthree"
  66 #define CG3(obj) OBJECT_CHECK(CG3State, (obj), TYPE_CG3)
  67
  68 typedef struct CG3State {
  69     SysBusDevice parent_obj;
  70
  71     QemuConsole *con;
  72     qemu_irq irq;
  73     hwaddr prom_addr;
  74     MemoryRegion vram_mem;
  75     MemoryRegion rom;
  76     MemoryRegion reg;
  77     uint32_t vram_size;
  78     int full_update;
  79     uint8_t regs[16];
  80     uint8_t r[256], g[256], b[256];
  81     uint16_t width, height, depth;
  82     uint8_t dac_index, dac_state;
  83 } CG3State;
  84
  85 static void cg3_update_display(void *opaque)
  86 {
  87     CG3State *s = opaque;
  88     DisplaySurface *surface = qemu_console_surface(s->con);
  89     const uint8_t *pix;
  90     uint32_t *data;
  91     uint32_t dval;
  92     int x, y, y_start;
  93     unsigned int width, height;
  94     ram_addr_t page, page_min, page_max;
  95
  96     if (surface_bits_per_pixel(surface) != 32) {
  97         return;
  98     }
  99     width = s->width;
 100     height = s->height;
 101
 102     y_start = -1;
 103     page_min = -1;
 104     page_max = 0;
 105     page = 0;
 106     pix = memory_region_get_ram_ptr(&s->vram_mem);
 107     data = (uint32_t *)surface_data(surface);
 108
 109     memory_region_sync_dirty_bitmap(&s->vram_mem);
 110     for (y = 0; y < height; y++) {
 111         int update = s->full_update;
 112
 113         page = (y * width) & TARGET_PAGE_MASK;
 114         update |= memory_region_get_dirty(&s->vram_mem, page, page + width,
 115                                           DIRTY_MEMORY_VGA);
 116         if (update) {
 117             if (y_start < 0) {
 118                 y_start = y;
 119             }
 120             if (page < page_min) {
 121                 page_min = page;
 122             }
 123             if (page > page_max) {
 124                 page_max = page;
 125             }
 126
 127             for (x = 0; x < width; x++) {
 128                 dval = *pix++;
 129                 dval = (s->r[dval] << 16) | (s->g[dval] << 8) | s->b[dval];
 130                 *data++ = dval;
 131             }
 132         } else {
 133             if (y_start >= 0) {
 134                 dpy_gfx_update(s->con, 0, y_start, s->width, y - y_start);
 135                 y_start = -1;
 136             }
 137             pix += width;
 138             data += width;
 139         }
 140     }
 141     s->full_update = 0;
 142     if (y_start >= 0) {
 143         dpy_gfx_update(s->con, 0, y_start, s->width, y - y_start);
 144     }
 145     if (page_max >= page_min) {
 146         memory_region_reset_dirty(&s->vram_mem,
 147                               page_min, page_max - page_min + TARGET_PAGE_SIZE,
 148                               DIRTY_MEMORY_VGA);
 149     }
 150     /* vsync interrupt? */
 151     if (s->regs[0] & CG3_CR_ENABLE_INTS) {
 152         s->regs[1] |= CG3_SR_PENDING_INT;
 153         qemu_irq_raise(s->irq);
 154     }
 155 }
 156
 157 static void cg3_invalidate_display(void *opaque)
 158 {
 159     CG3State *s = opaque;
 160
 161     memory_region_set_dirty(&s->vram_mem, 0, CG3_VRAM_SIZE);
 162 }
 163
 164 static uint64_t cg3_reg_read(void *opaque, hwaddr addr, unsigned size)
 165 {
 166     CG3State *s = opaque;
 167     int val;
 168
 169     switch (addr) {
 170     case CG3_REG_BT458_ADDR:
 171     case CG3_REG_BT458_COLMAP:
 172         val = 0;
 173         break;
 174     case CG3_REG_FBC_CTRL:
 175         val = s->regs[0];
 176         break;
 177     case CG3_REG_FBC_STATUS:
 178         /* monitor ID 6, board type = 1 (color) */
 179         val = s->regs[1] | CG3_SR_1152_900_76_B | CG3_SR_ID_COLOR;
 180         break;
 181     case CG3_REG_FBC_CURSTART ... CG3_REG_SIZE - 1:
 182         val = s->regs[addr - 0x10];
 183         break;
 184     default:
 185         qemu_log_mask(LOG_UNIMP,
 186                   "cg3: Unimplemented register read "
 187                   "reg 0x%" HWADDR_PRIx " size 0x%x\n",
 188                   addr, size);
 189         val = 0;
 190         break;
 191     }
 192     DPRINTF("read %02x from reg %" HWADDR_PRIx "\n", val, addr);
 193     return val;
 194 }
 195
 196 static void cg3_reg_write(void *opaque, hwaddr addr, uint64_t val,
 197                           unsigned size)
 198 {
 199     CG3State *s = opaque;
 200     uint8_t regval;
 201     int i;
 202
 203     DPRINTF("write %" PRIx64 " to reg %" HWADDR_PRIx " size %d\n",
 204             val, addr, size);
 205
 206     switch (addr) {
 207     case CG3_REG_BT458_ADDR:
 208         s->dac_index = val;
 209         s->dac_state = 0;
 210         break;
 211     case CG3_REG_BT458_COLMAP:
 212         /* This register can be written to as either a long word or a byte */
 213         if (size == 1) {
 214             val <<= 24;
 215         }
 216
 217         for (i = 0; i < size; i++) {
 218             regval = val >> 24;
 219
 220             switch (s->dac_state) {
 221             case 0:
 222                 s->r[s->dac_index] = regval;
 223                 s->dac_state++;
 224                 break;
 225             case 1:
 226                 s->g[s->dac_index] = regval;
 227                 s->dac_state++;
 228                 break;
 229             case 2:
 230                 s->b[s->dac_index] = regval;
 231                 /* Index autoincrement */
 232                 s->dac_index = (s->dac_index + 1) & 0xff;
 233             default:
 234                 s->dac_state = 0;
 235                 break;
 236             }
 237             val <<= 8;
 238         }
 239         s->full_update = 1;
 240         break;
 241     case CG3_REG_FBC_CTRL:
 242         s->regs[0] = val;
 243         break;
 244     case CG3_REG_FBC_STATUS:
 245         if (s->regs[1] & CG3_SR_PENDING_INT) {
 246             /* clear interrupt */
 247             s->regs[1] &= ~CG3_SR_PENDING_INT;
 248             qemu_irq_lower(s->irq);
 249         }
 250         break;
 251     case CG3_REG_FBC_CURSTART ... CG3_REG_SIZE - 1:
 252         s->regs[addr - 0x10] = val;
 253         break;
 254     default:
 255         qemu_log_mask(LOG_UNIMP,
 256                   "cg3: Unimplemented register write "
 257                   "reg 0x%" HWADDR_PRIx " size 0x%x value 0x%" PRIx64 "\n",
 258                   addr, size, val);
 259         break;
 260     }
 261 }
 262
 263 static const MemoryRegionOps cg3_reg_ops = {
 264     .read = cg3_reg_read,
 265     .write = cg3_reg_write,
 266     .endianness = DEVICE_NATIVE_ENDIAN,
 267     .valid = {
 268         .min_access_size = 1,
 269         .max_access_size = 4,
 270     },
 271 };
 272
 273 static const GraphicHwOps cg3_ops = {
 274     .invalidate = cg3_invalidate_display,
 275     .gfx_update = cg3_update_display,
 276 };
 277
 278 static void cg3_initfn(Object *obj)
 279 {
 280     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 281     CG3State *s = CG3(obj);
 282
 283     memory_region_init_ram(&s->rom, obj, "cg3.prom", FCODE_MAX_ROM_SIZE,
 284                            &error_fatal);
 285     memory_region_set_readonly(&s->rom, true);
 286     sysbus_init_mmio(sbd, &s->rom);
 287
 288     memory_region_init_io(&s->reg, obj, &cg3_reg_ops, s, "cg3.reg",
 289                           CG3_REG_SIZE);
 290     sysbus_init_mmio(sbd, &s->reg);
 291 }
 292
 293 static void cg3_realizefn(DeviceState *dev, Error **errp)
 294 {
 295     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
 296     CG3State *s = CG3(dev);
 297     int ret;
 298     char *fcode_filename;
 299
 300     /* FCode ROM */
 301     vmstate_register_ram_global(&s->rom);
 302     fcode_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, CG3_ROM_FILE);
 303     if (fcode_filename) {
 304         ret = load_image_targphys(fcode_filename, s->prom_addr,
 305                                   FCODE_MAX_ROM_SIZE);
 306         g_free(fcode_filename);
 307         if (ret < 0 || ret > FCODE_MAX_ROM_SIZE) {
 308             error_report("cg3: could not load prom '%s'", CG3_ROM_FILE);
 309         }
 310     }
 311
 312     memory_region_init_ram(&s->vram_mem, NULL, "cg3.vram", s->vram_size,
 313                            &error_fatal);
 314     memory_region_set_log(&s->vram_mem, true, DIRTY_MEMORY_VGA);
 315     vmstate_register_ram_global(&s->vram_mem);
 316     sysbus_init_mmio(sbd, &s->vram_mem);
 317
 318     sysbus_init_irq(sbd, &s->irq);
 319
 320     s->con = graphic_console_init(DEVICE(dev), 0, &cg3_ops, s);
 321     qemu_console_resize(s->con, s->width, s->height);
 322 }
 323
 324 static int vmstate_cg3_post_load(void *opaque, int version_id)
 325 {
 326     CG3State *s = opaque;
 327
 328     cg3_invalidate_display(s);
 329
 330     return 0;
 331 }
 332
 333 static const VMStateDescription vmstate_cg3 = {
 334     .name = "cg3",
 335     .version_id = 1,
 336     .minimum_version_id = 1,
 337     .post_load = vmstate_cg3_post_load,
 338     .fields = (VMStateField[]) {
 339         VMSTATE_UINT16(height, CG3State),
 340         VMSTATE_UINT16(width, CG3State),
 341         VMSTATE_UINT16(depth, CG3State),
 342         VMSTATE_BUFFER(r, CG3State),
 343         VMSTATE_BUFFER(g, CG3State),
 344         VMSTATE_BUFFER(b, CG3State),
 345         VMSTATE_UINT8(dac_index, CG3State),
 346         VMSTATE_UINT8(dac_state, CG3State),
 347         VMSTATE_END_OF_LIST()
 348     }
 349 };
 350
 351 static void cg3_reset(DeviceState *d)
 352 {
 353     CG3State *s = CG3(d);
 354
 355     /* Initialize palette */
 356     memset(s->r, 0, 256);
 357     memset(s->g, 0, 256);
 358     memset(s->b, 0, 256);
 359
 360     s->dac_state = 0;
 361     s->full_update = 1;
 362     qemu_irq_lower(s->irq);
 363 }
 364
 365 static Property cg3_properties[] = {
 366     DEFINE_PROP_UINT32("vram-size",    CG3State, vram_size, -1),
 367     DEFINE_PROP_UINT16("width",        CG3State, width,     -1),
 368     DEFINE_PROP_UINT16("height",       CG3State, height,    -1),
 369     DEFINE_PROP_UINT16("depth",        CG3State, depth,     -1),
 370     DEFINE_PROP_UINT64("prom-addr",    CG3State, prom_addr, -1),
 371     DEFINE_PROP_END_OF_LIST(),
 372 };
 373
 374 static void cg3_class_init(ObjectClass *klass, void *data)
 375 {
 376     DeviceClass *dc = DEVICE_CLASS(klass);
 377
 378     dc->realize = cg3_realizefn;
 379     dc->reset = cg3_reset;
 380     dc->vmsd = &vmstate_cg3;
 381     dc->props = cg3_properties;
 382 }
 383
 384 static const TypeInfo cg3_info = {
 385     .name          = TYPE_CG3,
 386     .parent        = TYPE_SYS_BUS_DEVICE,
 387     .instance_size = sizeof(CG3State),
 388     .instance_init = cg3_initfn,
 389     .class_init    = cg3_class_init,
 390 };
 391
 392 static void cg3_register_types(void)
 393 {
 394     type_register_static(&cg3_info);
 395 }
 396
 397 type_init(cg3_register_types)