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