hw/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 #include "ssi.h"
  14 #include "console.h"
  15
  16 //#define DEBUG_SSD0323 1
  17
  18 #ifdef DEBUG_SSD0323
  19 #define DPRINTF(fmt, ...) \
  20 do { printf("ssd0323: " fmt , ## __VA_ARGS__); } while (0)
  21 #define BADF(fmt, ...) \
  22 do { \
  23     fprintf(stderr, "ssd0323: error: " fmt , ## __VA_ARGS__); abort(); \
  24 } while (0)
  25 #else
  26 #define DPRINTF(fmt, ...) do {} while(0)
  27 #define BADF(fmt, ...) \
  28 do { fprintf(stderr, "ssd0323: error: " fmt , ## __VA_ARGS__);} while (0)
  29 #endif
  30
  31 /* Scaling factor for pixels.  */
  32 #define MAGNIFY 4
  33
  34 #define REMAP_SWAP_COLUMN 0x01
  35 #define REMAP_SWAP_NYBBLE 0x02
  36 #define REMAP_VERTICAL    0x04
  37 #define REMAP_SWAP_COM    0x10
  38 #define REMAP_SPLIT_COM   0x40
  39
  40 enum ssd0323_mode
  41 {
  42     SSD0323_CMD,
  43     SSD0323_DATA
  44 };
  45
  46 typedef struct {
  47     SSISlave ssidev;
  48     DisplayState *ds;
  49
  50     int cmd_len;
  51     int cmd;
  52     int cmd_data[8];
  53     int row;
  54     int row_start;
  55     int row_end;
  56     int col;
  57     int col_start;
  58     int col_end;
  59     int redraw;
  60     int remap;
  61     enum ssd0323_mode mode;
  62     uint8_t framebuffer[128 * 80 / 2];
  63 } ssd0323_state;
  64
  65 static uint32_t ssd0323_transfer(SSISlave *dev, uint32_t data)
  66 {
  67     ssd0323_state *s = FROM_SSI_SLAVE(ssd0323_state, dev);
  68
  69     switch (s->mode) {
  70     case SSD0323_DATA:
  71         DPRINTF("data 0x%02x\n", data);
  72         s->framebuffer[s->col + s->row * 64] = data;
  73         if (s->remap & REMAP_VERTICAL) {
  74             s->row++;
  75             if (s->row > s->row_end) {
  76                 s->row = s->row_start;
  77                 s->col++;
  78             }
  79             if (s->col > s->col_end) {
  80                 s->col = s->col_start;
  81             }
  82         } else {
  83             s->col++;
  84             if (s->col > s->col_end) {
  85                 s->row++;
  86                 s->col = s->col_start;
  87             }
  88             if (s->row > s->row_end) {
  89                 s->row = s->row_start;
  90             }
  91         }
  92         s->redraw = 1;
  93         break;
  94     case SSD0323_CMD:
  95         DPRINTF("cmd 0x%02x\n", data);
  96         if (s->cmd_len == 0) {
  97             s->cmd = data;
  98         } else {
  99             s->cmd_data[s->cmd_len - 1] = data;
 100         }
 101         s->cmd_len++;
 102         switch (s->cmd) {
 103 #define DATA(x) if (s->cmd_len <= (x)) return 0
 104         case 0x15: /* Set column.  */
 105             DATA(2);
 106             s->col = s->col_start = s->cmd_data[0] % 64;
 107             s->col_end = s->cmd_data[1] % 64;
 108             break;
 109         case 0x75: /* Set row.  */
 110             DATA(2);
 111             s->row = s->row_start = s->cmd_data[0] % 80;
 112             s->row_end = s->cmd_data[1] % 80;
 113             break;
 114         case 0x81: /* Set contrast */
 115             DATA(1);
 116             break;
 117         case 0x84: case 0x85: case 0x86: /* Max current.  */
 118             DATA(0);
 119             break;
 120         case 0xa0: /* Set remapping.  */
 121             /* FIXME: Implement this.  */
 122             DATA(1);
 123             s->remap = s->cmd_data[0];
 124             break;
 125         case 0xa1: /* Set display start line.  */
 126         case 0xa2: /* Set display offset.  */
 127             /* FIXME: Implement these.  */
 128             DATA(1);
 129             break;
 130         case 0xa4: /* Normal mode.  */
 131         case 0xa5: /* All on.  */
 132         case 0xa6: /* All off.  */
 133         case 0xa7: /* Inverse.  */
 134             /* FIXME: Implement these.  */
 135             DATA(0);
 136             break;
 137         case 0xa8: /* Set multiplex ratio.  */
 138         case 0xad: /* Set DC-DC converter.  */
 139             DATA(1);
 140             /* Ignored.  Don't care.  */
 141             break;
 142         case 0xae: /* Display off.  */
 143         case 0xaf: /* Display on.  */
 144             DATA(0);
 145             /* TODO: Implement power control.  */
 146             break;
 147         case 0xb1: /* Set phase length.  */
 148         case 0xb2: /* Set row period.  */
 149         case 0xb3: /* Set clock rate.  */
 150         case 0xbc: /* Set precharge.  */
 151         case 0xbe: /* Set VCOMH.  */
 152         case 0xbf: /* Set segment low.  */
 153             DATA(1);
 154             /* Ignored.  Don't care.  */
 155             break;
 156         case 0xb8: /* Set grey scale table.  */
 157             /* FIXME: Implement this.  */
 158             DATA(8);
 159             break;
 160         case 0xe3: /* NOP.  */
 161             DATA(0);
 162             break;
 163         case 0xff: /* Nasty hack because we don't handle chip selects
 164                       properly.  */
 165             break;
 166         default:
 167             BADF("Unknown command: 0x%x\n", data);
 168         }
 169         s->cmd_len = 0;
 170         return 0;
 171     }
 172     return 0;
 173 }
 174
 175 static void ssd0323_update_display(void *opaque)
 176 {
 177     ssd0323_state *s = (ssd0323_state *)opaque;
 178     uint8_t *dest;
 179     uint8_t *src;
 180     int x;
 181     int y;
 182     int i;
 183     int line;
 184     char *colors[16];
 185     char colortab[MAGNIFY * 64];
 186     char *p;
 187     int dest_width;
 188
 189     if (!s->redraw)
 190         return;
 191
 192     switch (ds_get_bits_per_pixel(s->ds)) {
 193     case 0:
 194         return;
 195     case 15:
 196         dest_width = 2;
 197         break;
 198     case 16:
 199         dest_width = 2;
 200         break;
 201     case 24:
 202         dest_width = 3;
 203         break;
 204     case 32:
 205         dest_width = 4;
 206         break;
 207     default:
 208         BADF("Bad color depth\n");
 209         return;
 210     }
 211     p = colortab;
 212     for (i = 0; i < 16; i++) {
 213         int n;
 214         colors[i] = p;
 215         switch (ds_get_bits_per_pixel(s->ds)) {
 216         case 15:
 217             n = i * 2 + (i >> 3);
 218             p[0] = n | (n << 5);
 219             p[1] = (n << 2) | (n >> 3);
 220             break;
 221         case 16:
 222             n = i * 2 + (i >> 3);
 223             p[0] = n | (n << 6) | ((n << 1) & 0x20);
 224             p[1] = (n << 3) | (n >> 2);
 225             break;
 226         case 24:
 227         case 32:
 228             n = (i << 4) | i;
 229             p[0] = p[1] = p[2] = n;
 230             break;
 231         default:
 232             BADF("Bad color depth\n");
 233             return;
 234         }
 235         p += dest_width;
 236     }
 237     /* TODO: Implement row/column remapping.  */
 238     dest = ds_get_data(s->ds);
 239     for (y = 0; y < 64; y++) {
 240         line = y;
 241         src = s->framebuffer + 64 * line;
 242         for (x = 0; x < 64; x++) {
 243             int val;
 244             val = *src >> 4;
 245             for (i = 0; i < MAGNIFY; i++) {
 246                 memcpy(dest, colors[val], dest_width);
 247                 dest += dest_width;
 248             }
 249             val = *src & 0xf;
 250             for (i = 0; i < MAGNIFY; i++) {
 251                 memcpy(dest, colors[val], dest_width);
 252                 dest += dest_width;
 253             }
 254             src++;
 255         }
 256         for (i = 1; i < MAGNIFY; i++) {
 257             memcpy(dest, dest - dest_width * MAGNIFY * 128,
 258                    dest_width * 128 * MAGNIFY);
 259             dest += dest_width * 128 * MAGNIFY;
 260         }
 261     }
 262     s->redraw = 0;
 263     dpy_update(s->ds, 0, 0, 128 * MAGNIFY, 64 * MAGNIFY);
 264 }
 265
 266 static void ssd0323_invalidate_display(void * opaque)
 267 {
 268     ssd0323_state *s = (ssd0323_state *)opaque;
 269     s->redraw = 1;
 270 }
 271
 272 /* Command/data input.  */
 273 static void ssd0323_cd(void *opaque, int n, int level)
 274 {
 275     ssd0323_state *s = (ssd0323_state *)opaque;
 276     DPRINTF("%s mode\n", level ? "Data" : "Command");
 277     s->mode = level ? SSD0323_DATA : SSD0323_CMD;
 278 }
 279
 280 static void ssd0323_save(QEMUFile *f, void *opaque)
 281 {
 282     SSISlave *ss = SSI_SLAVE(opaque);
 283     ssd0323_state *s = (ssd0323_state *)opaque;
 284     int i;
 285
 286     qemu_put_be32(f, s->cmd_len);
 287     qemu_put_be32(f, s->cmd);
 288     for (i = 0; i < 8; i++)
 289         qemu_put_be32(f, s->cmd_data[i]);
 290     qemu_put_be32(f, s->row);
 291     qemu_put_be32(f, s->row_start);
 292     qemu_put_be32(f, s->row_end);
 293     qemu_put_be32(f, s->col);
 294     qemu_put_be32(f, s->col_start);
 295     qemu_put_be32(f, s->col_end);
 296     qemu_put_be32(f, s->redraw);
 297     qemu_put_be32(f, s->remap);
 298     qemu_put_be32(f, s->mode);
 299     qemu_put_buffer(f, s->framebuffer, sizeof(s->framebuffer));
 300
 301     qemu_put_be32(f, ss->cs);
 302 }
 303
 304 static int ssd0323_load(QEMUFile *f, void *opaque, int version_id)
 305 {
 306     SSISlave *ss = SSI_SLAVE(opaque);
 307     ssd0323_state *s = (ssd0323_state *)opaque;
 308     int i;
 309
 310     if (version_id != 1)
 311         return -EINVAL;
 312
 313     s->cmd_len = qemu_get_be32(f);
 314     s->cmd = qemu_get_be32(f);
 315     for (i = 0; i < 8; i++)
 316         s->cmd_data[i] = qemu_get_be32(f);
 317     s->row = qemu_get_be32(f);
 318     s->row_start = qemu_get_be32(f);
 319     s->row_end = qemu_get_be32(f);
 320     s->col = qemu_get_be32(f);
 321     s->col_start = qemu_get_be32(f);
 322     s->col_end = qemu_get_be32(f);
 323     s->redraw = qemu_get_be32(f);
 324     s->remap = qemu_get_be32(f);
 325     s->mode = qemu_get_be32(f);
 326     qemu_get_buffer(f, s->framebuffer, sizeof(s->framebuffer));
 327
 328     ss->cs = qemu_get_be32(f);
 329
 330     return 0;
 331 }
 332
 333 static int ssd0323_init(SSISlave *dev)
 334 {
 335     ssd0323_state *s = FROM_SSI_SLAVE(ssd0323_state, dev);
 336
 337     s->col_end = 63;
 338     s->row_end = 79;
 339     s->ds = graphic_console_init(ssd0323_update_display,
 340                                  ssd0323_invalidate_display,
 341                                  NULL, NULL, s);
 342     qemu_console_resize(s->ds, 128 * MAGNIFY, 64 * MAGNIFY);
 343
 344     qdev_init_gpio_in(&dev->qdev, ssd0323_cd, 1);
 345
 346     register_savevm(&dev->qdev, "ssd0323_oled", -1, 1,
 347                     ssd0323_save, ssd0323_load, s);
 348     return 0;
 349 }
 350
 351 static void ssd0323_class_init(ObjectClass *klass, void *data)
 352 {
 353     SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
 354
 355     k->init = ssd0323_init;
 356     k->transfer = ssd0323_transfer;
 357     k->cs_polarity = SSI_CS_HIGH;
 358 }
 359
 360 static TypeInfo ssd0323_info = {
 361     .name          = "ssd0323",
 362     .parent        = TYPE_SSI_SLAVE,
 363     .instance_size = sizeof(ssd0323_state),
 364     .class_init    = ssd0323_class_init,
 365 };
 366
 367 static void ssd03232_register_types(void)
 368 {
 369     type_register_static(&ssd0323_info);
 370 }
 371
 372 type_init(ssd03232_register_types)