hw/display/ssd0323.c

   1 /*
   2  * SSD0323 OLED controller with OSRAM Pictiva 128x64 display.
   3  *
   4  * Copyright (c) 2006-2007 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licensed under the GPL.
   8  */
   9
  10 /* The controller can support a variety of different displays, but we only
  11    implement one.  Most of the commends relating to brightness and geometry
  12    setup are ignored. */
  13
  14 #include "qemu/osdep.h"
  15 #include "hw/ssi/ssi.h"
  16 #include "migration/vmstate.h"
  17 #include "qemu/module.h"
  18 #include "ui/console.h"
  19
  20 //#define DEBUG_SSD0323 1
  21
  22 #ifdef DEBUG_SSD0323
  23 #define DPRINTF(fmt, ...) \
  24 do { printf("ssd0323: " fmt , ## __VA_ARGS__); } while (0)
  25 #define BADF(fmt, ...) \
  26 do { \
  27     fprintf(stderr, "ssd0323: error: " fmt , ## __VA_ARGS__); abort(); \
  28 } while (0)
  29 #else
  30 #define DPRINTF(fmt, ...) do {} while(0)
  31 #define BADF(fmt, ...) \
  32 do { fprintf(stderr, "ssd0323: error: " fmt , ## __VA_ARGS__);} while (0)
  33 #endif
  34
  35 /* Scaling factor for pixels.  */
  36 #define MAGNIFY 4
  37
  38 #define REMAP_SWAP_COLUMN 0x01
  39 #define REMAP_SWAP_NYBBLE 0x02
  40 #define REMAP_VERTICAL    0x04
  41 #define REMAP_SWAP_COM    0x10
  42 #define REMAP_SPLIT_COM   0x40
  43
  44 enum ssd0323_mode
  45 {
  46     SSD0323_CMD,
  47     SSD0323_DATA
  48 };
  49
  50 typedef struct {
  51     SSISlave ssidev;
  52     QemuConsole *con;
  53
  54     uint32_t cmd_len;
  55     int32_t cmd;
  56     int32_t cmd_data[8];
  57     int32_t row;
  58     int32_t row_start;
  59     int32_t row_end;
  60     int32_t col;
  61     int32_t col_start;
  62     int32_t col_end;
  63     int32_t redraw;
  64     int32_t remap;
  65     uint32_t mode;
  66     uint8_t framebuffer[128 * 80 / 2];
  67 } ssd0323_state;
  68
  69 static uint32_t ssd0323_transfer(SSISlave *dev, uint32_t data)
  70 {
  71     ssd0323_state *s = FROM_SSI_SLAVE(ssd0323_state, dev);
  72
  73     switch (s->mode) {
  74     case SSD0323_DATA:
  75         DPRINTF("data 0x%02x\n", data);
  76         s->framebuffer[s->col + s->row * 64] = data;
  77         if (s->remap & REMAP_VERTICAL) {
  78             s->row++;
  79             if (s->row > s->row_end) {
  80                 s->row = s->row_start;
  81                 s->col++;
  82             }
  83             if (s->col > s->col_end) {
  84                 s->col = s->col_start;
  85             }
  86         } else {
  87             s->col++;
  88             if (s->col > s->col_end) {
  89                 s->row++;
  90                 s->col = s->col_start;
  91             }
  92             if (s->row > s->row_end) {
  93                 s->row = s->row_start;
  94             }
  95         }
  96         s->redraw = 1;
  97         break;
  98     case SSD0323_CMD:
  99         DPRINTF("cmd 0x%02x\n", data);
 100         if (s->cmd_len == 0) {
 101             s->cmd = data;
 102         } else {
 103             s->cmd_data[s->cmd_len - 1] = data;
 104         }
 105         s->cmd_len++;
 106         switch (s->cmd) {
 107 #define DATA(x) if (s->cmd_len <= (x)) return 0
 108         case 0x15: /* Set column.  */
 109             DATA(2);
 110             s->col = s->col_start = s->cmd_data[0] % 64;
 111             s->col_end = s->cmd_data[1] % 64;
 112             break;
 113         case 0x75: /* Set row.  */
 114             DATA(2);
 115             s->row = s->row_start = s->cmd_data[0] % 80;
 116             s->row_end = s->cmd_data[1] % 80;
 117             break;
 118         case 0x81: /* Set contrast */
 119             DATA(1);
 120             break;
 121         case 0x84: case 0x85: case 0x86: /* Max current.  */
 122             DATA(0);
 123             break;
 124         case 0xa0: /* Set remapping.  */
 125             /* FIXME: Implement this.  */
 126             DATA(1);
 127             s->remap = s->cmd_data[0];
 128             break;
 129         case 0xa1: /* Set display start line.  */
 130         case 0xa2: /* Set display offset.  */
 131             /* FIXME: Implement these.  */
 132             DATA(1);
 133             break;
 134         case 0xa4: /* Normal mode.  */
 135         case 0xa5: /* All on.  */
 136         case 0xa6: /* All off.  */
 137         case 0xa7: /* Inverse.  */
 138             /* FIXME: Implement these.  */
 139             DATA(0);
 140             break;
 141         case 0xa8: /* Set multiplex ratio.  */
 142         case 0xad: /* Set DC-DC converter.  */
 143             DATA(1);
 144             /* Ignored.  Don't care.  */
 145             break;
 146         case 0xae: /* Display off.  */
 147         case 0xaf: /* Display on.  */
 148             DATA(0);
 149             /* TODO: Implement power control.  */
 150             break;
 151         case 0xb1: /* Set phase length.  */
 152         case 0xb2: /* Set row period.  */
 153         case 0xb3: /* Set clock rate.  */
 154         case 0xbc: /* Set precharge.  */
 155         case 0xbe: /* Set VCOMH.  */
 156         case 0xbf: /* Set segment low.  */
 157             DATA(1);
 158             /* Ignored.  Don't care.  */
 159             break;
 160         case 0xb8: /* Set grey scale table.  */
 161             /* FIXME: Implement this.  */
 162             DATA(8);
 163             break;
 164         case 0xe3: /* NOP.  */
 165             DATA(0);
 166             break;
 167         case 0xff: /* Nasty hack because we don't handle chip selects
 168                       properly.  */
 169             break;
 170         default:
 171             BADF("Unknown command: 0x%x\n", data);
 172         }
 173         s->cmd_len = 0;
 174         return 0;
 175     }
 176     return 0;
 177 }
 178
 179 static void ssd0323_update_display(void *opaque)
 180 {
 181     ssd0323_state *s = (ssd0323_state *)opaque;
 182     DisplaySurface *surface = qemu_console_surface(s->con);
 183     uint8_t *dest;
 184     uint8_t *src;
 185     int x;
 186     int y;
 187     int i;
 188     int line;
 189     char *colors[16];
 190     char colortab[MAGNIFY * 64];
 191     char *p;
 192     int dest_width;
 193
 194     if (!s->redraw)
 195         return;
 196
 197     switch (surface_bits_per_pixel(surface)) {
 198     case 0:
 199         return;
 200     case 15:
 201         dest_width = 2;
 202         break;
 203     case 16:
 204         dest_width = 2;
 205         break;
 206     case 24:
 207         dest_width = 3;
 208         break;
 209     case 32:
 210         dest_width = 4;
 211         break;
 212     default:
 213         BADF("Bad color depth\n");
 214         return;
 215     }
 216     p = colortab;
 217     for (i = 0; i < 16; i++) {
 218         int n;
 219         colors[i] = p;
 220         switch (surface_bits_per_pixel(surface)) {
 221         case 15:
 222             n = i * 2 + (i >> 3);
 223             p[0] = n | (n << 5);
 224             p[1] = (n << 2) | (n >> 3);
 225             break;
 226         case 16:
 227             n = i * 2 + (i >> 3);
 228             p[0] = n | (n << 6) | ((n << 1) & 0x20);
 229             p[1] = (n << 3) | (n >> 2);
 230             break;
 231         case 24:
 232         case 32:
 233             n = (i << 4) | i;
 234             p[0] = p[1] = p[2] = n;
 235             break;
 236         default:
 237             BADF("Bad color depth\n");
 238             return;
 239         }
 240         p += dest_width;
 241     }
 242     /* TODO: Implement row/column remapping.  */
 243     dest = surface_data(surface);
 244     for (y = 0; y < 64; y++) {
 245         line = y;
 246         src = s->framebuffer + 64 * line;
 247         for (x = 0; x < 64; x++) {
 248             int val;
 249             val = *src >> 4;
 250             for (i = 0; i < MAGNIFY; i++) {
 251                 memcpy(dest, colors[val], dest_width);
 252                 dest += dest_width;
 253             }
 254             val = *src & 0xf;
 255             for (i = 0; i < MAGNIFY; i++) {
 256                 memcpy(dest, colors[val], dest_width);
 257                 dest += dest_width;
 258             }
 259             src++;
 260         }
 261         for (i = 1; i < MAGNIFY; i++) {
 262             memcpy(dest, dest - dest_width * MAGNIFY * 128,
 263                    dest_width * 128 * MAGNIFY);
 264             dest += dest_width * 128 * MAGNIFY;
 265         }
 266     }
 267     s->redraw = 0;
 268     dpy_gfx_update(s->con, 0, 0, 128 * MAGNIFY, 64 * MAGNIFY);
 269 }
 270
 271 static void ssd0323_invalidate_display(void * opaque)
 272 {
 273     ssd0323_state *s = (ssd0323_state *)opaque;
 274     s->redraw = 1;
 275 }
 276
 277 /* Command/data input.  */
 278 static void ssd0323_cd(void *opaque, int n, int level)
 279 {
 280     ssd0323_state *s = (ssd0323_state *)opaque;
 281     DPRINTF("%s mode\n", level ? "Data" : "Command");
 282     s->mode = level ? SSD0323_DATA : SSD0323_CMD;
 283 }
 284
 285 static int ssd0323_post_load(void *opaque, int version_id)
 286 {
 287     ssd0323_state *s = (ssd0323_state *)opaque;
 288
 289     if (s->cmd_len > ARRAY_SIZE(s->cmd_data)) {
 290         return -EINVAL;
 291     }
 292     if (s->row < 0 || s->row >= 80) {
 293         return -EINVAL;
 294     }
 295     if (s->row_start < 0 || s->row_start >= 80) {
 296         return -EINVAL;
 297     }
 298     if (s->row_end < 0 || s->row_end >= 80) {
 299         return -EINVAL;
 300     }
 301     if (s->col < 0 || s->col >= 64) {
 302         return -EINVAL;
 303     }
 304     if (s->col_start < 0 || s->col_start >= 64) {
 305         return -EINVAL;
 306     }
 307     if (s->col_end < 0 || s->col_end >= 64) {
 308         return -EINVAL;
 309     }
 310     if (s->mode != SSD0323_CMD && s->mode != SSD0323_DATA) {
 311         return -EINVAL;
 312     }
 313
 314     return 0;
 315 }
 316
 317 static const VMStateDescription vmstate_ssd0323 = {
 318     .name = "ssd0323_oled",
 319     .version_id = 2,
 320     .minimum_version_id = 2,
 321     .post_load = ssd0323_post_load,
 322     .fields      = (VMStateField []) {
 323         VMSTATE_UINT32(cmd_len, ssd0323_state),
 324         VMSTATE_INT32(cmd, ssd0323_state),
 325         VMSTATE_INT32_ARRAY(cmd_data, ssd0323_state, 8),
 326         VMSTATE_INT32(row, ssd0323_state),
 327         VMSTATE_INT32(row_start, ssd0323_state),
 328         VMSTATE_INT32(row_end, ssd0323_state),
 329         VMSTATE_INT32(col, ssd0323_state),
 330         VMSTATE_INT32(col_start, ssd0323_state),
 331         VMSTATE_INT32(col_end, ssd0323_state),
 332         VMSTATE_INT32(redraw, ssd0323_state),
 333         VMSTATE_INT32(remap, ssd0323_state),
 334         VMSTATE_UINT32(mode, ssd0323_state),
 335         VMSTATE_BUFFER(framebuffer, ssd0323_state),
 336         VMSTATE_SSI_SLAVE(ssidev, ssd0323_state),
 337         VMSTATE_END_OF_LIST()
 338     }
 339 };
 340
 341 static const GraphicHwOps ssd0323_ops = {
 342     .invalidate  = ssd0323_invalidate_display,
 343     .gfx_update  = ssd0323_update_display,
 344 };
 345
 346 static void ssd0323_realize(SSISlave *d, Error **errp)
 347 {
 348     DeviceState *dev = DEVICE(d);
 349     ssd0323_state *s = FROM_SSI_SLAVE(ssd0323_state, d);
 350
 351     s->col_end = 63;
 352     s->row_end = 79;
 353     s->con = graphic_console_init(dev, 0, &ssd0323_ops, s);
 354     qemu_console_resize(s->con, 128 * MAGNIFY, 64 * MAGNIFY);
 355
 356     qdev_init_gpio_in(dev, ssd0323_cd, 1);
 357 }
 358
 359 static void ssd0323_class_init(ObjectClass *klass, void *data)
 360 {
 361     DeviceClass *dc = DEVICE_CLASS(klass);
 362     SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
 363
 364     k->realize = ssd0323_realize;
 365     k->transfer = ssd0323_transfer;
 366     k->cs_polarity = SSI_CS_HIGH;
 367     dc->vmsd = &vmstate_ssd0323;
 368 }
 369
 370 static const TypeInfo ssd0323_info = {
 371     .name          = "ssd0323",
 372     .parent        = TYPE_SSI_SLAVE,
 373     .instance_size = sizeof(ssd0323_state),
 374     .class_init    = ssd0323_class_init,
 375 };
 376
 377 static void ssd03232_register_types(void)
 378 {
 379     type_register_static(&ssd0323_info);
 380 }
 381
 382 type_init(ssd03232_register_types)