hw/m68k/mcf5206.c

   1 /*
   2  * Motorola ColdFire MCF5206 SoC embedded peripheral emulation.
   3  *
   4  * Copyright (c) 2007 CodeSourcery.
   5  *
   6  * This code is licensed under the GPL
   7  */
   8 #include "hw/hw.h"
   9 #include "hw/m68k/mcf.h"
  10 #include "qemu/timer.h"
  11 #include "hw/ptimer.h"
  12 #include "sysemu/sysemu.h"
  13 #include "exec/address-spaces.h"
  14
  15 /* General purpose timer module.  */
  16 typedef struct {
  17     uint16_t tmr;
  18     uint16_t trr;
  19     uint16_t tcr;
  20     uint16_t ter;
  21     ptimer_state *timer;
  22     qemu_irq irq;
  23     int irq_state;
  24 } m5206_timer_state;
  25
  26 #define TMR_RST 0x01
  27 #define TMR_CLK 0x06
  28 #define TMR_FRR 0x08
  29 #define TMR_ORI 0x10
  30 #define TMR_OM  0x20
  31 #define TMR_CE  0xc0
  32
  33 #define TER_CAP 0x01
  34 #define TER_REF 0x02
  35
  36 static void m5206_timer_update(m5206_timer_state *s)
  37 {
  38     if ((s->tmr & TMR_ORI) != 0 && (s->ter & TER_REF))
  39         qemu_irq_raise(s->irq);
  40     else
  41         qemu_irq_lower(s->irq);
  42 }
  43
  44 static void m5206_timer_reset(m5206_timer_state *s)
  45 {
  46     s->tmr = 0;
  47     s->trr = 0;
  48 }
  49
  50 static void m5206_timer_recalibrate(m5206_timer_state *s)
  51 {
  52     int prescale;
  53     int mode;
  54
  55     ptimer_stop(s->timer);
  56
  57     if ((s->tmr & TMR_RST) == 0)
  58         return;
  59
  60     prescale = (s->tmr >> 8) + 1;
  61     mode = (s->tmr >> 1) & 3;
  62     if (mode == 2)
  63         prescale *= 16;
  64
  65     if (mode == 3 || mode == 0)
  66         hw_error("m5206_timer: mode %d not implemented\n", mode);
  67     if ((s->tmr & TMR_FRR) == 0)
  68         hw_error("m5206_timer: free running mode not implemented\n");
  69
  70     /* Assume 66MHz system clock.  */
  71     ptimer_set_freq(s->timer, 66000000 / prescale);
  72
  73     ptimer_set_limit(s->timer, s->trr, 0);
  74
  75     ptimer_run(s->timer, 0);
  76 }
  77
  78 static void m5206_timer_trigger(void *opaque)
  79 {
  80     m5206_timer_state *s = (m5206_timer_state *)opaque;
  81     s->ter |= TER_REF;
  82     m5206_timer_update(s);
  83 }
  84
  85 static uint32_t m5206_timer_read(m5206_timer_state *s, uint32_t addr)
  86 {
  87     switch (addr) {
  88     case 0:
  89         return s->tmr;
  90     case 4:
  91         return s->trr;
  92     case 8:
  93         return s->tcr;
  94     case 0xc:
  95         return s->trr - ptimer_get_count(s->timer);
  96     case 0x11:
  97         return s->ter;
  98     default:
  99         return 0;
 100     }
 101 }
 102
 103 static void m5206_timer_write(m5206_timer_state *s, uint32_t addr, uint32_t val)
 104 {
 105     switch (addr) {
 106     case 0:
 107         if ((s->tmr & TMR_RST) != 0 && (val & TMR_RST) == 0) {
 108             m5206_timer_reset(s);
 109         }
 110         s->tmr = val;
 111         m5206_timer_recalibrate(s);
 112         break;
 113     case 4:
 114         s->trr = val;
 115         m5206_timer_recalibrate(s);
 116         break;
 117     case 8:
 118         s->tcr = val;
 119         break;
 120     case 0xc:
 121         ptimer_set_count(s->timer, val);
 122         break;
 123     case 0x11:
 124         s->ter &= ~val;
 125         break;
 126     default:
 127         break;
 128     }
 129     m5206_timer_update(s);
 130 }
 131
 132 static m5206_timer_state *m5206_timer_init(qemu_irq irq)
 133 {
 134     m5206_timer_state *s;
 135     QEMUBH *bh;
 136
 137     s = (m5206_timer_state *)g_malloc0(sizeof(m5206_timer_state));
 138     bh = qemu_bh_new(m5206_timer_trigger, s);
 139     s->timer = ptimer_init(bh);
 140     s->irq = irq;
 141     m5206_timer_reset(s);
 142     return s;
 143 }
 144
 145 /* System Integration Module.  */
 146
 147 typedef struct {
 148     M68kCPU *cpu;
 149     MemoryRegion iomem;
 150     m5206_timer_state *timer[2];
 151     void *uart[2];
 152     uint8_t scr;
 153     uint8_t icr[14];
 154     uint16_t imr; /* 1 == interrupt is masked.  */
 155     uint16_t ipr;
 156     uint8_t rsr;
 157     uint8_t swivr;
 158     uint8_t par;
 159     /* Include the UART vector registers here.  */
 160     uint8_t uivr[2];
 161 } m5206_mbar_state;
 162
 163 /* Interrupt controller.  */
 164
 165 static int m5206_find_pending_irq(m5206_mbar_state *s)
 166 {
 167     int level;
 168     int vector;
 169     uint16_t active;
 170     int i;
 171
 172     level = 0;
 173     vector = 0;
 174     active = s->ipr & ~s->imr;
 175     if (!active)
 176         return 0;
 177
 178     for (i = 1; i < 14; i++) {
 179         if (active & (1 << i)) {
 180             if ((s->icr[i] & 0x1f) > level) {
 181                 level = s->icr[i] & 0x1f;
 182                 vector = i;
 183             }
 184         }
 185     }
 186
 187     if (level < 4)
 188         vector = 0;
 189
 190     return vector;
 191 }
 192
 193 static void m5206_mbar_update(m5206_mbar_state *s)
 194 {
 195     int irq;
 196     int vector;
 197     int level;
 198
 199     irq = m5206_find_pending_irq(s);
 200     if (irq) {
 201         int tmp;
 202         tmp = s->icr[irq];
 203         level = (tmp >> 2) & 7;
 204         if (tmp & 0x80) {
 205             /* Autovector.  */
 206             vector = 24 + level;
 207         } else {
 208             switch (irq) {
 209             case 8: /* SWT */
 210                 vector = s->swivr;
 211                 break;
 212             case 12: /* UART1 */
 213                 vector = s->uivr[0];
 214                 break;
 215             case 13: /* UART2 */
 216                 vector = s->uivr[1];
 217                 break;
 218             default:
 219                 /* Unknown vector.  */
 220                 fprintf(stderr, "Unhandled vector for IRQ %d\n", irq);
 221                 vector = 0xf;
 222                 break;
 223             }
 224         }
 225     } else {
 226         level = 0;
 227         vector = 0;
 228     }
 229     m68k_set_irq_level(s->cpu, level, vector);
 230 }
 231
 232 static void m5206_mbar_set_irq(void *opaque, int irq, int level)
 233 {
 234     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 235     if (level) {
 236         s->ipr |= 1 << irq;
 237     } else {
 238         s->ipr &= ~(1 << irq);
 239     }
 240     m5206_mbar_update(s);
 241 }
 242
 243 /* System Integration Module.  */
 244
 245 static void m5206_mbar_reset(m5206_mbar_state *s)
 246 {
 247     s->scr = 0xc0;
 248     s->icr[1] = 0x04;
 249     s->icr[2] = 0x08;
 250     s->icr[3] = 0x0c;
 251     s->icr[4] = 0x10;
 252     s->icr[5] = 0x14;
 253     s->icr[6] = 0x18;
 254     s->icr[7] = 0x1c;
 255     s->icr[8] = 0x1c;
 256     s->icr[9] = 0x80;
 257     s->icr[10] = 0x80;
 258     s->icr[11] = 0x80;
 259     s->icr[12] = 0x00;
 260     s->icr[13] = 0x00;
 261     s->imr = 0x3ffe;
 262     s->rsr = 0x80;
 263     s->swivr = 0x0f;
 264     s->par = 0;
 265 }
 266
 267 static uint64_t m5206_mbar_read(m5206_mbar_state *s,
 268                                 uint64_t offset, unsigned size)
 269 {
 270     if (offset >= 0x100 && offset < 0x120) {
 271         return m5206_timer_read(s->timer[0], offset - 0x100);
 272     } else if (offset >= 0x120 && offset < 0x140) {
 273         return m5206_timer_read(s->timer[1], offset - 0x120);
 274     } else if (offset >= 0x140 && offset < 0x160) {
 275         return mcf_uart_read(s->uart[0], offset - 0x140, size);
 276     } else if (offset >= 0x180 && offset < 0x1a0) {
 277         return mcf_uart_read(s->uart[1], offset - 0x180, size);
 278     }
 279     switch (offset) {
 280     case 0x03: return s->scr;
 281     case 0x14 ... 0x20: return s->icr[offset - 0x13];
 282     case 0x36: return s->imr;
 283     case 0x3a: return s->ipr;
 284     case 0x40: return s->rsr;
 285     case 0x41: return 0;
 286     case 0x42: return s->swivr;
 287     case 0x50:
 288         /* DRAM mask register.  */
 289         /* FIXME: currently hardcoded to 128Mb.  */
 290         {
 291             uint32_t mask = ~0;
 292             while (mask > ram_size)
 293                 mask >>= 1;
 294             return mask & 0x0ffe0000;
 295         }
 296     case 0x5c: return 1; /* DRAM bank 1 empty.  */
 297     case 0xcb: return s->par;
 298     case 0x170: return s->uivr[0];
 299     case 0x1b0: return s->uivr[1];
 300     }
 301     hw_error("Bad MBAR read offset 0x%x", (int)offset);
 302     return 0;
 303 }
 304
 305 static void m5206_mbar_write(m5206_mbar_state *s, uint32_t offset,
 306                              uint64_t value, unsigned size)
 307 {
 308     if (offset >= 0x100 && offset < 0x120) {
 309         m5206_timer_write(s->timer[0], offset - 0x100, value);
 310         return;
 311     } else if (offset >= 0x120 && offset < 0x140) {
 312         m5206_timer_write(s->timer[1], offset - 0x120, value);
 313         return;
 314     } else if (offset >= 0x140 && offset < 0x160) {
 315         mcf_uart_write(s->uart[0], offset - 0x140, value, size);
 316         return;
 317     } else if (offset >= 0x180 && offset < 0x1a0) {
 318         mcf_uart_write(s->uart[1], offset - 0x180, value, size);
 319         return;
 320     }
 321     switch (offset) {
 322     case 0x03:
 323         s->scr = value;
 324         break;
 325     case 0x14 ... 0x20:
 326         s->icr[offset - 0x13] = value;
 327         m5206_mbar_update(s);
 328         break;
 329     case 0x36:
 330         s->imr = value;
 331         m5206_mbar_update(s);
 332         break;
 333     case 0x40:
 334         s->rsr &= ~value;
 335         break;
 336     case 0x41:
 337         /* TODO: implement watchdog.  */
 338         break;
 339     case 0x42:
 340         s->swivr = value;
 341         break;
 342     case 0xcb:
 343         s->par = value;
 344         break;
 345     case 0x170:
 346         s->uivr[0] = value;
 347         break;
 348     case 0x178: case 0x17c: case 0x1c8: case 0x1bc:
 349         /* Not implemented: UART Output port bits.  */
 350         break;
 351     case 0x1b0:
 352         s->uivr[1] = value;
 353         break;
 354     default:
 355         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 356         break;
 357     }
 358 }
 359
 360 /* Internal peripherals use a variety of register widths.
 361    This lookup table allows a single routine to handle all of them.  */
 362 static const uint8_t m5206_mbar_width[] =
 363 {
 364   /* 000-040 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  2, 2, 2, 2,
 365   /* 040-080 */ 1, 2, 2, 2,  4, 1, 2, 4,  1, 2, 4, 2,  2, 4, 2, 2,
 366   /* 080-0c0 */ 4, 2, 2, 4,  2, 2, 4, 2,  2, 4, 2, 2,  4, 2, 2, 4,
 367   /* 0c0-100 */ 2, 2, 1, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
 368   /* 100-140 */ 2, 2, 2, 2,  1, 0, 0, 0,  2, 2, 2, 2,  1, 0, 0, 0,
 369   /* 140-180 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
 370   /* 180-1c0 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
 371   /* 1c0-200 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
 372 };
 373
 374 static uint32_t m5206_mbar_readw(void *opaque, hwaddr offset);
 375 static uint32_t m5206_mbar_readl(void *opaque, hwaddr offset);
 376
 377 static uint32_t m5206_mbar_readb(void *opaque, hwaddr offset)
 378 {
 379     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 380     offset &= 0x3ff;
 381     if (offset >= 0x200) {
 382         hw_error("Bad MBAR read offset 0x%x", (int)offset);
 383     }
 384     if (m5206_mbar_width[offset >> 2] > 1) {
 385         uint16_t val;
 386         val = m5206_mbar_readw(opaque, offset & ~1);
 387         if ((offset & 1) == 0) {
 388             val >>= 8;
 389         }
 390         return val & 0xff;
 391     }
 392     return m5206_mbar_read(s, offset, 1);
 393 }
 394
 395 static uint32_t m5206_mbar_readw(void *opaque, hwaddr offset)
 396 {
 397     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 398     int width;
 399     offset &= 0x3ff;
 400     if (offset >= 0x200) {
 401         hw_error("Bad MBAR read offset 0x%x", (int)offset);
 402     }
 403     width = m5206_mbar_width[offset >> 2];
 404     if (width > 2) {
 405         uint32_t val;
 406         val = m5206_mbar_readl(opaque, offset & ~3);
 407         if ((offset & 3) == 0)
 408             val >>= 16;
 409         return val & 0xffff;
 410     } else if (width < 2) {
 411         uint16_t val;
 412         val = m5206_mbar_readb(opaque, offset) << 8;
 413         val |= m5206_mbar_readb(opaque, offset + 1);
 414         return val;
 415     }
 416     return m5206_mbar_read(s, offset, 2);
 417 }
 418
 419 static uint32_t m5206_mbar_readl(void *opaque, hwaddr offset)
 420 {
 421     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 422     int width;
 423     offset &= 0x3ff;
 424     if (offset >= 0x200) {
 425         hw_error("Bad MBAR read offset 0x%x", (int)offset);
 426     }
 427     width = m5206_mbar_width[offset >> 2];
 428     if (width < 4) {
 429         uint32_t val;
 430         val = m5206_mbar_readw(opaque, offset) << 16;
 431         val |= m5206_mbar_readw(opaque, offset + 2);
 432         return val;
 433     }
 434     return m5206_mbar_read(s, offset, 4);
 435 }
 436
 437 static void m5206_mbar_writew(void *opaque, hwaddr offset,
 438                               uint32_t value);
 439 static void m5206_mbar_writel(void *opaque, hwaddr offset,
 440                               uint32_t value);
 441
 442 static void m5206_mbar_writeb(void *opaque, hwaddr offset,
 443                               uint32_t value)
 444 {
 445     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 446     int width;
 447     offset &= 0x3ff;
 448     if (offset >= 0x200) {
 449         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 450     }
 451     width = m5206_mbar_width[offset >> 2];
 452     if (width > 1) {
 453         uint32_t tmp;
 454         tmp = m5206_mbar_readw(opaque, offset & ~1);
 455         if (offset & 1) {
 456             tmp = (tmp & 0xff00) | value;
 457         } else {
 458             tmp = (tmp & 0x00ff) | (value << 8);
 459         }
 460         m5206_mbar_writew(opaque, offset & ~1, tmp);
 461         return;
 462     }
 463     m5206_mbar_write(s, offset, value, 1);
 464 }
 465
 466 static void m5206_mbar_writew(void *opaque, hwaddr offset,
 467                               uint32_t value)
 468 {
 469     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 470     int width;
 471     offset &= 0x3ff;
 472     if (offset >= 0x200) {
 473         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 474     }
 475     width = m5206_mbar_width[offset >> 2];
 476     if (width > 2) {
 477         uint32_t tmp;
 478         tmp = m5206_mbar_readl(opaque, offset & ~3);
 479         if (offset & 3) {
 480             tmp = (tmp & 0xffff0000) | value;
 481         } else {
 482             tmp = (tmp & 0x0000ffff) | (value << 16);
 483         }
 484         m5206_mbar_writel(opaque, offset & ~3, tmp);
 485         return;
 486     } else if (width < 2) {
 487         m5206_mbar_writeb(opaque, offset, value >> 8);
 488         m5206_mbar_writeb(opaque, offset + 1, value & 0xff);
 489         return;
 490     }
 491     m5206_mbar_write(s, offset, value, 2);
 492 }
 493
 494 static void m5206_mbar_writel(void *opaque, hwaddr offset,
 495                               uint32_t value)
 496 {
 497     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 498     int width;
 499     offset &= 0x3ff;
 500     if (offset >= 0x200) {
 501         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 502     }
 503     width = m5206_mbar_width[offset >> 2];
 504     if (width < 4) {
 505         m5206_mbar_writew(opaque, offset, value >> 16);
 506         m5206_mbar_writew(opaque, offset + 2, value & 0xffff);
 507         return;
 508     }
 509     m5206_mbar_write(s, offset, value, 4);
 510 }
 511
 512 static const MemoryRegionOps m5206_mbar_ops = {
 513     .old_mmio = {
 514         .read = {
 515             m5206_mbar_readb,
 516             m5206_mbar_readw,
 517             m5206_mbar_readl,
 518         },
 519         .write = {
 520             m5206_mbar_writeb,
 521             m5206_mbar_writew,
 522             m5206_mbar_writel,
 523         },
 524     },
 525     .endianness = DEVICE_NATIVE_ENDIAN,
 526 };
 527
 528 qemu_irq *mcf5206_init(MemoryRegion *sysmem, uint32_t base, M68kCPU *cpu)
 529 {
 530     m5206_mbar_state *s;
 531     qemu_irq *pic;
 532
 533     s = (m5206_mbar_state *)g_malloc0(sizeof(m5206_mbar_state));
 534
 535     memory_region_init_io(&s->iomem, &m5206_mbar_ops, s,
 536                           "mbar", 0x00001000);
 537     memory_region_add_subregion(sysmem, base, &s->iomem);
 538
 539     pic = qemu_allocate_irqs(m5206_mbar_set_irq, s, 14);
 540     s->timer[0] = m5206_timer_init(pic[9]);
 541     s->timer[1] = m5206_timer_init(pic[10]);
 542     s->uart[0] = mcf_uart_init(pic[12], serial_hds[0]);
 543     s->uart[1] = mcf_uart_init(pic[13], serial_hds[1]);
 544     s->cpu = cpu;
 545
 546     m5206_mbar_reset(s);
 547     return pic;
 548 }