hw/display/milkymist-vgafb.c

   1
   2 /*
   3  *  QEMU model of the Milkymist VGA framebuffer.
   4  *
   5  *  Copyright (c) 2010-2012 Michael Walle <michael@walle.cc>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  *
  20  *
  21  * Specification available at:
  22  *   http://milkymist.walle.cc/socdoc/vgafb.pdf
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "hw/hw.h"
  27 #include "hw/qdev-properties.h"
  28 #include "hw/sysbus.h"
  29 #include "trace.h"
  30 #include "ui/console.h"
  31 #include "framebuffer.h"
  32 #include "ui/pixel_ops.h"
  33 #include "qemu/error-report.h"
  34 #include "qemu/module.h"
  35 #include "qom/object.h"
  36
  37 #define BITS 8
  38 #include "migration/vmstate.h"
  39 #include "milkymist-vgafb_template.h"
  40 #define BITS 15
  41 #include "milkymist-vgafb_template.h"
  42 #define BITS 16
  43 #include "milkymist-vgafb_template.h"
  44 #define BITS 24
  45 #include "milkymist-vgafb_template.h"
  46 #define BITS 32
  47 #include "milkymist-vgafb_template.h"
  48
  49 enum {
  50     R_CTRL = 0,
  51     R_HRES,
  52     R_HSYNC_START,
  53     R_HSYNC_END,
  54     R_HSCAN,
  55     R_VRES,
  56     R_VSYNC_START,
  57     R_VSYNC_END,
  58     R_VSCAN,
  59     R_BASEADDRESS,
  60     R_BASEADDRESS_ACT,
  61     R_BURST_COUNT,
  62     R_DDC,
  63     R_SOURCE_CLOCK,
  64     R_MAX
  65 };
  66
  67 enum {
  68     CTRL_RESET = (1<<0),
  69 };
  70
  71 #define TYPE_MILKYMIST_VGAFB "milkymist-vgafb"
  72 typedef struct MilkymistVgafbState MilkymistVgafbState;
  73 DECLARE_INSTANCE_CHECKER(MilkymistVgafbState, MILKYMIST_VGAFB,
  74                          TYPE_MILKYMIST_VGAFB)
  75
  76 struct MilkymistVgafbState {
  77     SysBusDevice parent_obj;
  78
  79     MemoryRegion regs_region;
  80     MemoryRegionSection fbsection;
  81     QemuConsole *con;
  82
  83     int invalidate;
  84     uint32_t fb_offset;
  85     uint32_t fb_mask;
  86
  87     uint32_t regs[R_MAX];
  88 };
  89
  90 static int vgafb_enabled(MilkymistVgafbState *s)
  91 {
  92     return !(s->regs[R_CTRL] & CTRL_RESET);
  93 }
  94
  95 static void vgafb_update_display(void *opaque)
  96 {
  97     MilkymistVgafbState *s = opaque;
  98     SysBusDevice *sbd;
  99     DisplaySurface *surface = qemu_console_surface(s->con);
 100     int src_width;
 101     int first = 0;
 102     int last = 0;
 103     drawfn fn;
 104
 105     if (!vgafb_enabled(s)) {
 106         return;
 107     }
 108
 109     sbd = SYS_BUS_DEVICE(s);
 110     int dest_width = s->regs[R_HRES];
 111
 112     switch (surface_bits_per_pixel(surface)) {
 113     case 0:
 114         return;
 115     case 8:
 116         fn = draw_line_8;
 117         break;
 118     case 15:
 119         fn = draw_line_15;
 120         dest_width *= 2;
 121         break;
 122     case 16:
 123         fn = draw_line_16;
 124         dest_width *= 2;
 125         break;
 126     case 24:
 127         fn = draw_line_24;
 128         dest_width *= 3;
 129         break;
 130     case 32:
 131         fn = draw_line_32;
 132         dest_width *= 4;
 133         break;
 134     default:
 135         hw_error("milkymist_vgafb: bad color depth\n");
 136         break;
 137     }
 138
 139     src_width = s->regs[R_HRES] * 2;
 140     if (s->invalidate) {
 141         framebuffer_update_memory_section(&s->fbsection,
 142                                           sysbus_address_space(sbd),
 143                                           s->regs[R_BASEADDRESS] + s->fb_offset,
 144                                           s->regs[R_VRES], src_width);
 145     }
 146
 147     framebuffer_update_display(surface, &s->fbsection,
 148                                s->regs[R_HRES],
 149                                s->regs[R_VRES],
 150                                src_width,
 151                                dest_width,
 152                                0,
 153                                s->invalidate,
 154                                fn,
 155                                NULL,
 156                                &first, &last);
 157
 158     if (first >= 0) {
 159         dpy_gfx_update(s->con, 0, first, s->regs[R_HRES], last - first + 1);
 160     }
 161     s->invalidate = 0;
 162 }
 163
 164 static void vgafb_invalidate_display(void *opaque)
 165 {
 166     MilkymistVgafbState *s = opaque;
 167     s->invalidate = 1;
 168 }
 169
 170 static void vgafb_resize(MilkymistVgafbState *s)
 171 {
 172     if (!vgafb_enabled(s)) {
 173         return;
 174     }
 175
 176     qemu_console_resize(s->con, s->regs[R_HRES], s->regs[R_VRES]);
 177     s->invalidate = 1;
 178 }
 179
 180 static uint64_t vgafb_read(void *opaque, hwaddr addr,
 181                            unsigned size)
 182 {
 183     MilkymistVgafbState *s = opaque;
 184     uint32_t r = 0;
 185
 186     addr >>= 2;
 187     switch (addr) {
 188     case R_CTRL:
 189     case R_HRES:
 190     case R_HSYNC_START:
 191     case R_HSYNC_END:
 192     case R_HSCAN:
 193     case R_VRES:
 194     case R_VSYNC_START:
 195     case R_VSYNC_END:
 196     case R_VSCAN:
 197     case R_BASEADDRESS:
 198     case R_BURST_COUNT:
 199     case R_DDC:
 200     case R_SOURCE_CLOCK:
 201         r = s->regs[addr];
 202     break;
 203     case R_BASEADDRESS_ACT:
 204         r = s->regs[R_BASEADDRESS];
 205     break;
 206
 207     default:
 208         error_report("milkymist_vgafb: read access to unknown register 0x"
 209                 TARGET_FMT_plx, addr << 2);
 210         break;
 211     }
 212
 213     trace_milkymist_vgafb_memory_read(addr << 2, r);
 214
 215     return r;
 216 }
 217
 218 static void vgafb_write(void *opaque, hwaddr addr, uint64_t value,
 219                         unsigned size)
 220 {
 221     MilkymistVgafbState *s = opaque;
 222
 223     trace_milkymist_vgafb_memory_write(addr, value);
 224
 225     addr >>= 2;
 226     switch (addr) {
 227     case R_CTRL:
 228         s->regs[addr] = value;
 229         vgafb_resize(s);
 230         break;
 231     case R_HSYNC_START:
 232     case R_HSYNC_END:
 233     case R_HSCAN:
 234     case R_VSYNC_START:
 235     case R_VSYNC_END:
 236     case R_VSCAN:
 237     case R_BURST_COUNT:
 238     case R_DDC:
 239     case R_SOURCE_CLOCK:
 240         s->regs[addr] = value;
 241         break;
 242     case R_BASEADDRESS:
 243         if (value & 0x1f) {
 244             error_report("milkymist_vgafb: framebuffer base address have to "
 245                      "be 32 byte aligned");
 246             break;
 247         }
 248         s->regs[addr] = value & s->fb_mask;
 249         s->invalidate = 1;
 250         break;
 251     case R_HRES:
 252     case R_VRES:
 253         s->regs[addr] = value;
 254         vgafb_resize(s);
 255         break;
 256     case R_BASEADDRESS_ACT:
 257         error_report("milkymist_vgafb: write to read-only register 0x"
 258                 TARGET_FMT_plx, addr << 2);
 259         break;
 260
 261     default:
 262         error_report("milkymist_vgafb: write access to unknown register 0x"
 263                 TARGET_FMT_plx, addr << 2);
 264         break;
 265     }
 266 }
 267
 268 static const MemoryRegionOps vgafb_mmio_ops = {
 269     .read = vgafb_read,
 270     .write = vgafb_write,
 271     .valid = {
 272         .min_access_size = 4,
 273         .max_access_size = 4,
 274     },
 275     .endianness = DEVICE_NATIVE_ENDIAN,
 276 };
 277
 278 static void milkymist_vgafb_reset(DeviceState *d)
 279 {
 280     MilkymistVgafbState *s = MILKYMIST_VGAFB(d);
 281     int i;
 282
 283     for (i = 0; i < R_MAX; i++) {
 284         s->regs[i] = 0;
 285     }
 286
 287     /* defaults */
 288     s->regs[R_CTRL] = CTRL_RESET;
 289     s->regs[R_HRES] = 640;
 290     s->regs[R_VRES] = 480;
 291     s->regs[R_BASEADDRESS] = 0;
 292 }
 293
 294 static const GraphicHwOps vgafb_ops = {
 295     .invalidate  = vgafb_invalidate_display,
 296     .gfx_update  = vgafb_update_display,
 297 };
 298
 299 static void milkymist_vgafb_init(Object *obj)
 300 {
 301     MilkymistVgafbState *s = MILKYMIST_VGAFB(obj);
 302     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 303
 304     memory_region_init_io(&s->regs_region, OBJECT(s), &vgafb_mmio_ops, s,
 305             "milkymist-vgafb", R_MAX * 4);
 306     sysbus_init_mmio(dev, &s->regs_region);
 307 }
 308
 309 static void milkymist_vgafb_realize(DeviceState *dev, Error **errp)
 310 {
 311     MilkymistVgafbState *s = MILKYMIST_VGAFB(dev);
 312
 313     s->con = graphic_console_init(dev, 0, &vgafb_ops, s);
 314 }
 315
 316 static int vgafb_post_load(void *opaque, int version_id)
 317 {
 318     vgafb_invalidate_display(opaque);
 319     return 0;
 320 }
 321
 322 static const VMStateDescription vmstate_milkymist_vgafb = {
 323     .name = "milkymist-vgafb",
 324     .version_id = 1,
 325     .minimum_version_id = 1,
 326     .post_load = vgafb_post_load,
 327     .fields = (VMStateField[]) {
 328         VMSTATE_UINT32_ARRAY(regs, MilkymistVgafbState, R_MAX),
 329         VMSTATE_END_OF_LIST()
 330     }
 331 };
 332
 333 static Property milkymist_vgafb_properties[] = {
 334     DEFINE_PROP_UINT32("fb_offset", MilkymistVgafbState, fb_offset, 0x0),
 335     DEFINE_PROP_UINT32("fb_mask", MilkymistVgafbState, fb_mask, 0xffffffff),
 336     DEFINE_PROP_END_OF_LIST(),
 337 };
 338
 339 static void milkymist_vgafb_class_init(ObjectClass *klass, void *data)
 340 {
 341     DeviceClass *dc = DEVICE_CLASS(klass);
 342
 343     dc->reset = milkymist_vgafb_reset;
 344     dc->vmsd = &vmstate_milkymist_vgafb;
 345     device_class_set_props(dc, milkymist_vgafb_properties);
 346     dc->realize = milkymist_vgafb_realize;
 347 }
 348
 349 static const TypeInfo milkymist_vgafb_info = {
 350     .name          = TYPE_MILKYMIST_VGAFB,
 351     .parent        = TYPE_SYS_BUS_DEVICE,
 352     .instance_size = sizeof(MilkymistVgafbState),
 353     .instance_init = milkymist_vgafb_init,
 354     .class_init    = milkymist_vgafb_class_init,
 355 };
 356
 357 static void milkymist_vgafb_register_types(void)
 358 {
 359     type_register_static(&milkymist_vgafb_info);
 360 }
 361
 362 type_init(milkymist_vgafb_register_types)