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     void *pic;
  33     uint32_t timing[4];
  34     uint32_t cr;
  35     uint32_t upbase;
  36     uint32_t lpbase;
  37     uint32_t int_status;
  38     uint32_t int_mask;
  39     int cols;
  40     int rows;
  41     enum pl110_bppmode bpp;
  42     int invalidate;
  43     uint32_t pallette[256];
  44     uint32_t raw_pallette[128];
  45     int irq;
  46 } pl110_state;
  47
  48 static const unsigned char pl110_id[] =
  49 { 0x10, 0x11, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  50
  51 /* The Arm documentation (DDI0224C) says the CLDC on the Versatile board
  52    has a different ID.  However Linux only looks for the normal ID.  */
  53 #if 0
  54 static const unsigned char pl110_versatile_id[] =
  55 { 0x93, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
  56 #else
  57 #define pl110_versatile_id pl110_id
  58 #endif
  59
  60 static inline uint32_t rgb_to_pixel8(unsigned int r, unsigned int g, unsigned b)
  61 {
  62     return ((r >> 5) << 5) | ((g >> 5) << 2) | (b >> 6);
  63 }
  64
  65 static inline uint32_t rgb_to_pixel15(unsigned int r, unsigned int g, unsigned b)
  66 {
  67     return ((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3);
  68 }
  69
  70 static inline uint32_t rgb_to_pixel16(unsigned int r, unsigned int g, unsigned b)
  71 {
  72     return ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
  73 }
  74
  75 static inline uint32_t rgb_to_pixel24(unsigned int r, unsigned int g, unsigned b)
  76 {
  77     return (r << 16) | (g << 8) | b;
  78 }
  79
  80 static inline uint32_t rgb_to_pixel32(unsigned int r, unsigned int g, unsigned b)
  81 {
  82     return (r << 16) | (g << 8) | b;
  83 }
  84
  85 typedef void (*drawfn)(uint32_t *, uint8_t *, const uint8_t *, int);
  86
  87 #define BITS 8
  88 #include "pl110_template.h"
  89 #define BITS 15
  90 #include "pl110_template.h"
  91 #define BITS 16
  92 #include "pl110_template.h"
  93 #define BITS 24
  94 #include "pl110_template.h"
  95 #define BITS 32
  96 #include "pl110_template.h"
  97
  98 static int pl110_enabled(pl110_state *s)
  99 {
 100   return (s->cr & PL110_CR_EN) && (s->cr & PL110_CR_PWR);
 101 }
 102
 103 static void pl110_update_display(void *opaque)
 104 {
 105     pl110_state *s = (pl110_state *)opaque;
 106     drawfn* fntable;
 107     drawfn fn;
 108     uint32_t *pallette;
 109     uint32_t addr;
 110     uint32_t base;
 111     int dest_width;
 112     int src_width;
 113     uint8_t *dest;
 114     uint8_t *src;
 115     int first, last = 0;
 116     int dirty, new_dirty;
 117     int i;
 118
 119     if (!pl110_enabled(s))
 120         return;
 121
 122     switch (s->ds->depth) {
 123     case 0:
 124         return;
 125     case 8:
 126         fntable = pl110_draw_fn_8;
 127         dest_width = 1;
 128         break;
 129     case 15:
 130         fntable = pl110_draw_fn_15;
 131         dest_width = 2;
 132         break;
 133     case 16:
 134         fntable = pl110_draw_fn_16;
 135         dest_width = 2;
 136         break;
 137     case 24:
 138         fntable = pl110_draw_fn_24;
 139         dest_width = 3;
 140         break;
 141     case 32:
 142         fntable = pl110_draw_fn_32;
 143         dest_width = 4;
 144         break;
 145     default:
 146         fprintf(stderr, "pl110: Bad color depth\n");
 147         exit(1);
 148     }
 149     if (s->cr & PL110_CR_BEBO)
 150       fn = fntable[s->bpp + 6];
 151     else if (s->cr & PL110_CR_BEPO)
 152       fn = fntable[s->bpp + 12];
 153     else
 154       fn = fntable[s->bpp];
 155
 156     src_width = s->cols;
 157     switch (s->bpp) {
 158     case BPP_1:
 159         src_width >>= 3;
 160         break;
 161     case BPP_2:
 162         src_width >>= 2;
 163         break;
 164     case BPP_4:
 165         src_width >>= 1;
 166         break;
 167     case BPP_8:
 168         break;
 169     case BPP_16:
 170         src_width <<= 1;
 171         break;
 172     case BPP_32:
 173         src_width <<= 2;
 174         break;
 175     }
 176     dest_width *= s->cols;
 177     pallette = s->pallette;
 178     base = s->upbase;
 179     /* HACK: Arm aliases physical memory at 0x80000000.  */
 180     if (base > 0x80000000)
 181         base -= 0x80000000;
 182     src = phys_ram_base + base;
 183     dest = s->ds->data;
 184     first = -1;
 185     addr = base;
 186
 187     dirty = cpu_physical_memory_get_dirty(addr, VGA_DIRTY_FLAG);
 188     for (i = 0; i < s->rows; i++) {
 189         new_dirty = 0;
 190         if ((addr & TARGET_PAGE_MASK) + src_width >= TARGET_PAGE_SIZE) {
 191             uint32_t tmp;
 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         return s->int_mask;
 306     case 7: /* LCDControl */
 307         return s->cr;
 308     case 8: /* LCDRIS */
 309         return s->int_status;
 310     case 9: /* LCDMIS */
 311         return s->int_status & s->int_mask;
 312     case 11: /* LCDUPCURR */
 313         /* TODO: Implement vertical refresh.  */
 314         return s->upbase;
 315     case 12: /* LCDLPCURR */
 316         return s->lpbase;
 317     default:
 318         cpu_abort (cpu_single_env, "pl110_read: Bad offset %x\n", offset);
 319         return 0;
 320     }
 321 }
 322
 323 static void pl110_write(void *opaque, target_phys_addr_t offset,
 324                         uint32_t val)
 325 {
 326     pl110_state *s = (pl110_state *)opaque;
 327     int n;
 328
 329     /* For simplicity invalidate the display whenever a control register
 330        is writen to.  */
 331     s->invalidate = 1;
 332     offset -= s->base;
 333     if (offset >= 0x200 && offset < 0x400) {
 334         /* Pallette.  */
 335         n = (offset - 0x200) >> 2;
 336         s->raw_pallette[(offset - 0x200) >> 2] = val;
 337         pl110_update_pallette(s, n);
 338         return;
 339     }
 340     switch (offset >> 2) {
 341     case 0: /* LCDTiming0 */
 342         s->timing[0] = val;
 343         n = ((val & 0xfc) + 4) * 4;
 344         pl110_resize(s, n, s->rows);
 345         break;
 346     case 1: /* LCDTiming1 */
 347         s->timing[1] = val;
 348         n = (val & 0x3ff) + 1;
 349         pl110_resize(s, s->cols, n);
 350         break;
 351     case 2: /* LCDTiming2 */
 352         s->timing[2] = val;
 353         break;
 354     case 3: /* LCDTiming3 */
 355         s->timing[3] = val;
 356         break;
 357     case 4: /* LCDUPBASE */
 358         s->upbase = val;
 359         break;
 360     case 5: /* LCDLPBASE */
 361         s->lpbase = val;
 362         break;
 363     case 6: /* LCDIMSC */
 364         if (s->versatile)
 365             goto control;
 366     imsc:
 367         s->int_mask = val;
 368         pl110_update(s);
 369         break;
 370     case 7: /* LCDControl */
 371         if (s->versatile)
 372             goto imsc;
 373     control:
 374         s->cr = val;
 375         s->bpp = (val >> 1) & 7;
 376         if (pl110_enabled(s)) {
 377             dpy_resize(s->ds, s->cols, s->rows);
 378         }
 379         break;
 380     case 10: /* LCDICR */
 381         s->int_status &= ~val;
 382         pl110_update(s);
 383         break;
 384     default:
 385         cpu_abort (cpu_single_env, "pl110_write: Bad offset %x\n", offset);
 386     }
 387 }
 388
 389 static CPUReadMemoryFunc *pl110_readfn[] = {
 390    pl110_read,
 391    pl110_read,
 392    pl110_read
 393 };
 394
 395 static CPUWriteMemoryFunc *pl110_writefn[] = {
 396    pl110_write,
 397    pl110_write,
 398    pl110_write
 399 };
 400
 401 void *pl110_init(DisplayState *ds, uint32_t base, void *pic, int irq,
 402                  int versatile)
 403 {
 404     pl110_state *s;
 405     int iomemtype;
 406
 407     s = (pl110_state *)qemu_mallocz(sizeof(pl110_state));
 408     iomemtype = cpu_register_io_memory(0, pl110_readfn,
 409                                        pl110_writefn, s);
 410     cpu_register_physical_memory(base, 0x00000fff, iomemtype);
 411     s->base = base;
 412     s->ds = ds;
 413     s->versatile = versatile;
 414     s->pic = pic;
 415     s->irq = irq;
 416     graphic_console_init(ds, pl110_update_display, pl110_invalidate_display,
 417                          NULL, s);
 418     /* ??? Save/restore.  */
 419     return s;
 420 }