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