hw/pl110.c

   1 /*
   2  * Arm PrimeCell PL110 Color LCD Controller
   3  *
   4  * Copyright (c) 2005-2006 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licenced under the GNU LGPL
   8  */
   9
  10 #include "vl.h"
  11
  12 #define PL110_CR_EN   0x001
  13 #define PL110_CR_BEBO 0x200
  14 #define PL110_CR_BEPO 0x400
  15 #define PL110_CR_PWR  0x800
  16
  17 enum pl110_bppmode
  18 {
  19     BPP_1,
  20     BPP_2,
  21     BPP_4,
  22     BPP_8,
  23     BPP_16,
  24     BPP_32
  25 };
  26
  27 typedef struct {
  28     uint32_t base;
  29     DisplayState *ds;
  30     /* The Versatile/PB uses a slightly modified PL110 controller.  */
  31     int versatile;
  32     uint32_t timing[4];
  33     uint32_t cr;
  34     uint32_t upbase;
  35     uint32_t lpbase;
  36     uint32_t int_status;
  37     uint32_t int_mask;
  38     int cols;
  39     int rows;
  40     enum pl110_bppmode bpp;
  41     int invalidate;
  42     uint32_t pallette[256];
  43     uint32_t raw_pallette[128];
  44     qemu_irq irq;
  45 } pl110_state;
  46
  47 static const unsigned char pl110_id[] =
  48 { 0x10, 0x11, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  49
  50 /* The Arm documentation (DDI0224C) says the CLDC on the Versatile board
  51    has a different ID.  However Linux only looks for the normal ID.  */
  52 #if 0
  53 static const unsigned char pl110_versatile_id[] =
  54 { 0x93, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  55 #else
  56 #define pl110_versatile_id pl110_id
  57 #endif
  58
  59 static inline uint32_t rgb_to_pixel8(unsigned int r, unsigned int g, unsigned b)
  60 {
  61     return ((r >> 5) << 5) | ((g >> 5) << 2) | (b >> 6);
  62 }
  63
  64 static inline uint32_t rgb_to_pixel15(unsigned int r, unsigned int g, unsigned b)
  65 {
  66     return ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3);
  67 }
  68
  69 static inline uint32_t rgb_to_pixel16(unsigned int r, unsigned int g, unsigned b)
  70 {
  71     return ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
  72 }
  73
  74 static inline uint32_t rgb_to_pixel24(unsigned int r, unsigned int g, unsigned b)
  75 {
  76     return (r << 16) | (g << 8) | b;
  77 }
  78
  79 static inline uint32_t rgb_to_pixel32(unsigned int r, unsigned int g, unsigned b)
  80 {
  81     return (r << 16) | (g << 8) | b;
  82 }
  83
  84 typedef void (*drawfn)(uint32_t *, uint8_t *, const uint8_t *, int);
  85
  86 #define BITS 8
  87 #include "pl110_template.h"
  88 #define BITS 15
  89 #include "pl110_template.h"
  90 #define BITS 16
  91 #include "pl110_template.h"
  92 #define BITS 24
  93 #include "pl110_template.h"
  94 #define BITS 32
  95 #include "pl110_template.h"
  96
  97 static int pl110_enabled(pl110_state *s)
  98 {
  99   return (s->cr & PL110_CR_EN) && (s->cr & PL110_CR_PWR);
 100 }
 101
 102 static void pl110_update_display(void *opaque)
 103 {
 104     pl110_state *s = (pl110_state *)opaque;
 105     drawfn* fntable;
 106     drawfn fn;
 107     uint32_t *pallette;
 108     uint32_t addr;
 109     uint32_t base;
 110     int dest_width;
 111     int src_width;
 112     uint8_t *dest;
 113     uint8_t *src;
 114     int first, last = 0;
 115     int dirty, new_dirty;
 116     int i;
 117
 118     if (!pl110_enabled(s))
 119         return;
 120
 121     switch (s->ds->depth) {
 122     case 0:
 123         return;
 124     case 8:
 125         fntable = pl110_draw_fn_8;
 126         dest_width = 1;
 127         break;
 128     case 15:
 129         fntable = pl110_draw_fn_15;
 130         dest_width = 2;
 131         break;
 132     case 16:
 133         fntable = pl110_draw_fn_16;
 134         dest_width = 2;
 135         break;
 136     case 24:
 137         fntable = pl110_draw_fn_24;
 138         dest_width = 3;
 139         break;
 140     case 32:
 141         fntable = pl110_draw_fn_32;
 142         dest_width = 4;
 143         break;
 144     default:
 145         fprintf(stderr, "pl110: Bad color depth\n");
 146         exit(1);
 147     }
 148     if (s->cr & PL110_CR_BEBO)
 149       fn = fntable[s->bpp + 6];
 150     else if (s->cr & PL110_CR_BEPO)
 151       fn = fntable[s->bpp + 12];
 152     else
 153       fn = fntable[s->bpp];
 154
 155     src_width = s->cols;
 156     switch (s->bpp) {
 157     case BPP_1:
 158         src_width >>= 3;
 159         break;
 160     case BPP_2:
 161         src_width >>= 2;
 162         break;
 163     case BPP_4:
 164         src_width >>= 1;
 165         break;
 166     case BPP_8:
 167         break;
 168     case BPP_16:
 169         src_width <<= 1;
 170         break;
 171     case BPP_32:
 172         src_width <<= 2;
 173         break;
 174     }
 175     dest_width *= s->cols;
 176     pallette = s->pallette;
 177     base = s->upbase;
 178     /* HACK: Arm aliases physical memory at 0x80000000.  */
 179     if (base > 0x80000000)
 180         base -= 0x80000000;
 181     src = phys_ram_base + base;
 182     dest = s->ds->data;
 183     first = -1;
 184     addr = base;
 185
 186     dirty = cpu_physical_memory_get_dirty(addr, VGA_DIRTY_FLAG);
 187     new_dirty = dirty;
 188     for (i = 0; i < s->rows; i++) {
 189         if ((addr & ~TARGET_PAGE_MASK) + src_width >= TARGET_PAGE_SIZE) {
 190             uint32_t tmp;
 191             new_dirty = 0;
 192             for (tmp = 0; tmp < src_width; tmp += TARGET_PAGE_SIZE) {
 193                 new_dirty |= cpu_physical_memory_get_dirty(addr + tmp,
 194                                                            VGA_DIRTY_FLAG);
 195             }
 196         }
 197
 198         if (dirty || new_dirty || s->invalidate) {
 199             fn(pallette, dest, src, s->cols);
 200             if (first == -1)
 201                 first = i;
 202             last = i;
 203         }
 204         dirty = new_dirty;
 205         addr += src_width;
 206         dest += dest_width;
 207         src += src_width;
 208     }
 209     if (first < 0)
 210       return;
 211
 212     s->invalidate = 0;
 213     cpu_physical_memory_reset_dirty(base + first * src_width,
 214                                     base + (last + 1) * src_width,
 215                                     VGA_DIRTY_FLAG);
 216     dpy_update(s->ds, 0, first, s->cols, last - first + 1);
 217 }
 218
 219 static void pl110_invalidate_display(void * opaque)
 220 {
 221     pl110_state *s = (pl110_state *)opaque;
 222     s->invalidate = 1;
 223 }
 224
 225 static void pl110_update_pallette(pl110_state *s, int n)
 226 {
 227     int i;
 228     uint32_t raw;
 229     unsigned int r, g, b;
 230
 231     raw = s->raw_pallette[n];
 232     n <<= 1;
 233     for (i = 0; i < 2; i++) {
 234         r = (raw & 0x1f) << 3;
 235         raw >>= 5;
 236         g = (raw & 0x1f) << 3;
 237         raw >>= 5;
 238         b = (raw & 0x1f) << 3;
 239         /* The I bit is ignored.  */
 240         raw >>= 6;
 241         switch (s->ds->depth) {
 242         case 8:
 243             s->pallette[n] = rgb_to_pixel8(r, g, b);
 244             break;
 245         case 15:
 246             s->pallette[n] = rgb_to_pixel15(r, g, b);
 247             break;
 248         case 16:
 249             s->pallette[n] = rgb_to_pixel16(r, g, b);
 250             break;
 251         case 24:
 252         case 32:
 253             s->pallette[n] = rgb_to_pixel32(r, g, b);
 254             break;
 255         }
 256         n++;
 257     }
 258 }
 259
 260 static void pl110_resize(pl110_state *s, int width, int height)
 261 {
 262     if (width != s->cols || height != s->rows) {
 263         if (pl110_enabled(s)) {
 264             dpy_resize(s->ds, width, height);
 265         }
 266     }
 267     s->cols = width;
 268     s->rows = height;
 269 }
 270
 271 /* Update interrupts.  */
 272 static void pl110_update(pl110_state *s)
 273 {
 274   /* TODO: Implement interrupts.  */
 275 }
 276
 277 static uint32_t pl110_read(void *opaque, target_phys_addr_t offset)
 278 {
 279     pl110_state *s = (pl110_state *)opaque;
 280
 281     offset -= s->base;
 282     if (offset >= 0xfe0 && offset < 0x1000) {
 283         if (s->versatile)
 284             return pl110_versatile_id[(offset - 0xfe0) >> 2];
 285         else
 286             return pl110_id[(offset - 0xfe0) >> 2];
 287     }
 288     if (offset >= 0x200 && offset < 0x400) {
 289         return s->raw_pallette[(offset - 0x200) >> 2];
 290     }
 291     switch (offset >> 2) {
 292     case 0: /* LCDTiming0 */
 293         return s->timing[0];
 294     case 1: /* LCDTiming1 */
 295         return s->timing[1];
 296     case 2: /* LCDTiming2 */
 297         return s->timing[2];
 298     case 3: /* LCDTiming3 */
 299         return s->timing[3];
 300     case 4: /* LCDUPBASE */
 301         return s->upbase;
 302     case 5: /* LCDLPBASE */
 303         return s->lpbase;
 304     case 6: /* LCDIMSC */
 305         if (s->versatile)
 306           return s->cr;
 307         return s->int_mask;
 308     case 7: /* LCDControl */
 309         if (s->versatile)
 310           return s->int_mask;
 311         return s->cr;
 312     case 8: /* LCDRIS */
 313         return s->int_status;
 314     case 9: /* LCDMIS */
 315         return s->int_status & s->int_mask;
 316     case 11: /* LCDUPCURR */
 317         /* TODO: Implement vertical refresh.  */
 318         return s->upbase;
 319     case 12: /* LCDLPCURR */
 320         return s->lpbase;
 321     default:
 322         cpu_abort (cpu_single_env, "pl110_read: Bad offset %x\n", offset);
 323         return 0;
 324     }
 325 }
 326
 327 static void pl110_write(void *opaque, target_phys_addr_t offset,
 328                         uint32_t val)
 329 {
 330     pl110_state *s = (pl110_state *)opaque;
 331     int n;
 332
 333     /* For simplicity invalidate the display whenever a control register
 334        is writen to.  */
 335     s->invalidate = 1;
 336     offset -= s->base;
 337     if (offset >= 0x200 && offset < 0x400) {
 338         /* Pallette.  */
 339         n = (offset - 0x200) >> 2;
 340         s->raw_pallette[(offset - 0x200) >> 2] = val;
 341         pl110_update_pallette(s, n);
 342         return;
 343     }
 344     switch (offset >> 2) {
 345     case 0: /* LCDTiming0 */
 346         s->timing[0] = val;
 347         n = ((val & 0xfc) + 4) * 4;
 348         pl110_resize(s, n, s->rows);
 349         break;
 350     case 1: /* LCDTiming1 */
 351         s->timing[1] = val;
 352         n = (val & 0x3ff) + 1;
 353         pl110_resize(s, s->cols, n);
 354         break;
 355     case 2: /* LCDTiming2 */
 356         s->timing[2] = val;
 357         break;
 358     case 3: /* LCDTiming3 */
 359         s->timing[3] = val;
 360         break;
 361     case 4: /* LCDUPBASE */
 362         s->upbase = val;
 363         break;
 364     case 5: /* LCDLPBASE */
 365         s->lpbase = val;
 366         break;
 367     case 6: /* LCDIMSC */
 368         if (s->versatile)
 369             goto control;
 370     imsc:
 371         s->int_mask = val;
 372         pl110_update(s);
 373         break;
 374     case 7: /* LCDControl */
 375         if (s->versatile)
 376             goto imsc;
 377     control:
 378         s->cr = val;
 379         s->bpp = (val >> 1) & 7;
 380         if (pl110_enabled(s)) {
 381             dpy_resize(s->ds, s->cols, s->rows);
 382         }
 383         break;
 384     case 10: /* LCDICR */
 385         s->int_status &= ~val;
 386         pl110_update(s);
 387         break;
 388     default:
 389         cpu_abort (cpu_single_env, "pl110_write: Bad offset %x\n", offset);
 390     }
 391 }
 392
 393 static CPUReadMemoryFunc *pl110_readfn[] = {
 394    pl110_read,
 395    pl110_read,
 396    pl110_read
 397 };
 398
 399 static CPUWriteMemoryFunc *pl110_writefn[] = {
 400    pl110_write,
 401    pl110_write,
 402    pl110_write
 403 };
 404
 405 void *pl110_init(DisplayState *ds, uint32_t base, qemu_irq irq,
 406                  int versatile)
 407 {
 408     pl110_state *s;
 409     int iomemtype;
 410
 411     s = (pl110_state *)qemu_mallocz(sizeof(pl110_state));
 412     iomemtype = cpu_register_io_memory(0, pl110_readfn,
 413                                        pl110_writefn, s);
 414     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 415     s->base = base;
 416     s->ds = ds;
 417     s->versatile = versatile;
 418     s->irq = irq;
 419     graphic_console_init(ds, pl110_update_display, pl110_invalidate_display,
 420                          NULL, s);
 421     /* ??? Save/restore.  */
 422     return s;
 423 }