hw/mcf5206.c

   1 /*
   2  * Motorola ColdFire MCF5206 SoC embedded peripheral emulation.
   3  *
   4  * Copyright (c) 2007 CodeSourcery.
   5  *
   6  * This code is licenced under the GPL
   7  */
   8 #include "hw.h"
   9 #include "mcf.h"
  10 #include "qemu-timer.h"
  11 #include "sysemu.h"
  12
  13 /* General purpose timer module.  */
  14 typedef struct {
  15     uint16_t tmr;
  16     uint16_t trr;
  17     uint16_t tcr;
  18     uint16_t ter;
  19     ptimer_state *timer;
  20     qemu_irq irq;
  21     int irq_state;
  22 } m5206_timer_state;
  23
  24 #define TMR_RST 0x01
  25 #define TMR_CLK 0x06
  26 #define TMR_FRR 0x08
  27 #define TMR_ORI 0x10
  28 #define TMR_OM  0x20
  29 #define TMR_CE  0xc0
  30
  31 #define TER_CAP 0x01
  32 #define TER_REF 0x02
  33
  34 static void m5206_timer_update(m5206_timer_state *s)
  35 {
  36     if ((s->tmr & TMR_ORI) != 0 && (s->ter & TER_REF))
  37         qemu_irq_raise(s->irq);
  38     else
  39         qemu_irq_lower(s->irq);
  40 }
  41
  42 static void m5206_timer_reset(m5206_timer_state *s)
  43 {
  44     s->tmr = 0;
  45     s->trr = 0;
  46 }
  47
  48 static void m5206_timer_recalibrate(m5206_timer_state *s)
  49 {
  50     int prescale;
  51     int mode;
  52
  53     ptimer_stop(s->timer);
  54
  55     if ((s->tmr & TMR_RST) == 0)
  56         return;
  57
  58     prescale = (s->tmr >> 8) + 1;
  59     mode = (s->tmr >> 1) & 3;
  60     if (mode == 2)
  61         prescale *= 16;
  62
  63     if (mode == 3 || mode == 0)
  64         hw_error("m5206_timer: mode %d not implemented\n", mode);
  65     if ((s->tmr & TMR_FRR) == 0)
  66         hw_error("m5206_timer: free running mode not implemented\n");
  67
  68     /* Assume 66MHz system clock.  */
  69     ptimer_set_freq(s->timer, 66000000 / prescale);
  70
  71     ptimer_set_limit(s->timer, s->trr, 0);
  72
  73     ptimer_run(s->timer, 0);
  74 }
  75
  76 static void m5206_timer_trigger(void *opaque)
  77 {
  78     m5206_timer_state *s = (m5206_timer_state *)opaque;
  79     s->ter |= TER_REF;
  80     m5206_timer_update(s);
  81 }
  82
  83 static uint32_t m5206_timer_read(m5206_timer_state *s, uint32_t addr)
  84 {
  85     switch (addr) {
  86     case 0:
  87         return s->tmr;
  88     case 4:
  89         return s->trr;
  90     case 8:
  91         return s->tcr;
  92     case 0xc:
  93         return s->trr - ptimer_get_count(s->timer);
  94     case 0x11:
  95         return s->ter;
  96     default:
  97         return 0;
  98     }
  99 }
 100
 101 static void m5206_timer_write(m5206_timer_state *s, uint32_t addr, uint32_t val)
 102 {
 103     switch (addr) {
 104     case 0:
 105         if ((s->tmr & TMR_RST) != 0 && (val & TMR_RST) == 0) {
 106             m5206_timer_reset(s);
 107         }
 108         s->tmr = val;
 109         m5206_timer_recalibrate(s);
 110         break;
 111     case 4:
 112         s->trr = val;
 113         m5206_timer_recalibrate(s);
 114         break;
 115     case 8:
 116         s->tcr = val;
 117         break;
 118     case 0xc:
 119         ptimer_set_count(s->timer, val);
 120         break;
 121     case 0x11:
 122         s->ter &= ~val;
 123         break;
 124     default:
 125         break;
 126     }
 127     m5206_timer_update(s);
 128 }
 129
 130 static m5206_timer_state *m5206_timer_init(qemu_irq irq)
 131 {
 132     m5206_timer_state *s;
 133     QEMUBH *bh;
 134
 135     s = (m5206_timer_state *)qemu_mallocz(sizeof(m5206_timer_state));
 136     bh = qemu_bh_new(m5206_timer_trigger, s);
 137     s->timer = ptimer_init(bh);
 138     s->irq = irq;
 139     m5206_timer_reset(s);
 140     return s;
 141 }
 142
 143 /* System Integration Module.  */
 144
 145 typedef struct {
 146     CPUState *env;
 147     m5206_timer_state *timer[2];
 148     void *uart[2];
 149     uint8_t scr;
 150     uint8_t icr[14];
 151     uint16_t imr; /* 1 == interrupt is masked.  */
 152     uint16_t ipr;
 153     uint8_t rsr;
 154     uint8_t swivr;
 155     uint8_t par;
 156     /* Include the UART vector registers here.  */
 157     uint8_t uivr[2];
 158 } m5206_mbar_state;
 159
 160 /* Interrupt controller.  */
 161
 162 static int m5206_find_pending_irq(m5206_mbar_state *s)
 163 {
 164     int level;
 165     int vector;
 166     uint16_t active;
 167     int i;
 168
 169     level = 0;
 170     vector = 0;
 171     active = s->ipr & ~s->imr;
 172     if (!active)
 173         return 0;
 174
 175     for (i = 1; i < 14; i++) {
 176         if (active & (1 << i)) {
 177             if ((s->icr[i] & 0x1f) > level) {
 178                 level = s->icr[i] & 0x1f;
 179                 vector = i;
 180             }
 181         }
 182     }
 183
 184     if (level < 4)
 185         vector = 0;
 186
 187     return vector;
 188 }
 189
 190 static void m5206_mbar_update(m5206_mbar_state *s)
 191 {
 192     int irq;
 193     int vector;
 194     int level;
 195
 196     irq = m5206_find_pending_irq(s);
 197     if (irq) {
 198         int tmp;
 199         tmp = s->icr[irq];
 200         level = (tmp >> 2) & 7;
 201         if (tmp & 0x80) {
 202             /* Autovector.  */
 203             vector = 24 + level;
 204         } else {
 205             switch (irq) {
 206             case 8: /* SWT */
 207                 vector = s->swivr;
 208                 break;
 209             case 12: /* UART1 */
 210                 vector = s->uivr[0];
 211                 break;
 212             case 13: /* UART2 */
 213                 vector = s->uivr[1];
 214                 break;
 215             default:
 216                 /* Unknown vector.  */
 217                 fprintf(stderr, "Unhandled vector for IRQ %d\n", irq);
 218                 vector = 0xf;
 219                 break;
 220             }
 221         }
 222     } else {
 223         level = 0;
 224         vector = 0;
 225     }
 226     m68k_set_irq_level(s->env, level, vector);
 227 }
 228
 229 static void m5206_mbar_set_irq(void *opaque, int irq, int level)
 230 {
 231     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 232     if (level) {
 233         s->ipr |= 1 << irq;
 234     } else {
 235         s->ipr &= ~(1 << irq);
 236     }
 237     m5206_mbar_update(s);
 238 }
 239
 240 /* System Integration Module.  */
 241
 242 static void m5206_mbar_reset(m5206_mbar_state *s)
 243 {
 244     s->scr = 0xc0;
 245     s->icr[1] = 0x04;
 246     s->icr[2] = 0x08;
 247     s->icr[3] = 0x0c;
 248     s->icr[4] = 0x10;
 249     s->icr[5] = 0x14;
 250     s->icr[6] = 0x18;
 251     s->icr[7] = 0x1c;
 252     s->icr[8] = 0x1c;
 253     s->icr[9] = 0x80;
 254     s->icr[10] = 0x80;
 255     s->icr[11] = 0x80;
 256     s->icr[12] = 0x00;
 257     s->icr[13] = 0x00;
 258     s->imr = 0x3ffe;
 259     s->rsr = 0x80;
 260     s->swivr = 0x0f;
 261     s->par = 0;
 262 }
 263
 264 static uint32_t m5206_mbar_read(m5206_mbar_state *s, uint32_t offset)
 265 {
 266     if (offset >= 0x100 && offset < 0x120) {
 267         return m5206_timer_read(s->timer[0], offset - 0x100);
 268     } else if (offset >= 0x120 && offset < 0x140) {
 269         return m5206_timer_read(s->timer[1], offset - 0x120);
 270     } else if (offset >= 0x140 && offset < 0x160) {
 271         return mcf_uart_read(s->uart[0], offset - 0x140);
 272     } else if (offset >= 0x180 && offset < 0x1a0) {
 273         return mcf_uart_read(s->uart[1], offset - 0x180);
 274     }
 275     switch (offset) {
 276     case 0x03: return s->scr;
 277     case 0x14 ... 0x20: return s->icr[offset - 0x13];
 278     case 0x36: return s->imr;
 279     case 0x3a: return s->ipr;
 280     case 0x40: return s->rsr;
 281     case 0x41: return 0;
 282     case 0x42: return s->swivr;
 283     case 0x50:
 284         /* DRAM mask register.  */
 285         /* FIXME: currently hardcoded to 128Mb.  */
 286         {
 287             uint32_t mask = ~0;
 288             while (mask > ram_size)
 289                 mask >>= 1;
 290             return mask & 0x0ffe0000;
 291         }
 292     case 0x5c: return 1; /* DRAM bank 1 empty.  */
 293     case 0xcb: return s->par;
 294     case 0x170: return s->uivr[0];
 295     case 0x1b0: return s->uivr[1];
 296     }
 297     hw_error("Bad MBAR read offset 0x%x", (int)offset);
 298     return 0;
 299 }
 300
 301 static void m5206_mbar_write(m5206_mbar_state *s, uint32_t offset,
 302                              uint32_t value)
 303 {
 304     if (offset >= 0x100 && offset < 0x120) {
 305         m5206_timer_write(s->timer[0], offset - 0x100, value);
 306         return;
 307     } else if (offset >= 0x120 && offset < 0x140) {
 308         m5206_timer_write(s->timer[1], offset - 0x120, value);
 309         return;
 310     } else if (offset >= 0x140 && offset < 0x160) {
 311         mcf_uart_write(s->uart[0], offset - 0x140, value);
 312         return;
 313     } else if (offset >= 0x180 && offset < 0x1a0) {
 314         mcf_uart_write(s->uart[1], offset - 0x180, value);
 315         return;
 316     }
 317     switch (offset) {
 318     case 0x03:
 319         s->scr = value;
 320         break;
 321     case 0x14 ... 0x20:
 322         s->icr[offset - 0x13] = value;
 323         m5206_mbar_update(s);
 324         break;
 325     case 0x36:
 326         s->imr = value;
 327         m5206_mbar_update(s);
 328         break;
 329     case 0x40:
 330         s->rsr &= ~value;
 331         break;
 332     case 0x41:
 333         /* TODO: implement watchdog.  */
 334         break;
 335     case 0x42:
 336         s->swivr = value;
 337         break;
 338     case 0xcb:
 339         s->par = value;
 340         break;
 341     case 0x170:
 342         s->uivr[0] = value;
 343         break;
 344     case 0x178: case 0x17c: case 0x1c8: case 0x1bc:
 345         /* Not implemented: UART Output port bits.  */
 346         break;
 347     case 0x1b0:
 348         s->uivr[1] = value;
 349         break;
 350     default:
 351         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 352         break;
 353     }
 354 }
 355
 356 /* Internal peripherals use a variety of register widths.
 357    This lookup table allows a single routine to handle all of them.  */
 358 static const int m5206_mbar_width[] =
 359 {
 360   /* 000-040 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  2, 2, 2, 2,
 361   /* 040-080 */ 1, 2, 2, 2,  4, 1, 2, 4,  1, 2, 4, 2,  2, 4, 2, 2,
 362   /* 080-0c0 */ 4, 2, 2, 4,  2, 2, 4, 2,  2, 4, 2, 2,  4, 2, 2, 4,
 363   /* 0c0-100 */ 2, 2, 1, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
 364   /* 100-140 */ 2, 2, 2, 2,  1, 0, 0, 0,  2, 2, 2, 2,  1, 0, 0, 0,
 365   /* 140-180 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
 366   /* 180-1c0 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
 367   /* 1c0-200 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
 368 };
 369
 370 static uint32_t m5206_mbar_readw(void *opaque, target_phys_addr_t offset);
 371 static uint32_t m5206_mbar_readl(void *opaque, target_phys_addr_t offset);
 372
 373 static uint32_t m5206_mbar_readb(void *opaque, target_phys_addr_t offset)
 374 {
 375     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 376     offset &= 0x3ff;
 377     if (offset > 0x200) {
 378         hw_error("Bad MBAR read offset 0x%x", (int)offset);
 379     }
 380     if (m5206_mbar_width[offset >> 2] > 1) {
 381         uint16_t val;
 382         val = m5206_mbar_readw(opaque, offset & ~1);
 383         if ((offset & 1) == 0) {
 384             val >>= 8;
 385         }
 386         return val & 0xff;
 387     }
 388     return m5206_mbar_read(s, offset);
 389 }
 390
 391 static uint32_t m5206_mbar_readw(void *opaque, target_phys_addr_t offset)
 392 {
 393     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 394     int width;
 395     offset &= 0x3ff;
 396     if (offset > 0x200) {
 397         hw_error("Bad MBAR read offset 0x%x", (int)offset);
 398     }
 399     width = m5206_mbar_width[offset >> 2];
 400     if (width > 2) {
 401         uint32_t val;
 402         val = m5206_mbar_readl(opaque, offset & ~3);
 403         if ((offset & 3) == 0)
 404             val >>= 16;
 405         return val & 0xffff;
 406     } else if (width < 2) {
 407         uint16_t val;
 408         val = m5206_mbar_readb(opaque, offset) << 8;
 409         val |= m5206_mbar_readb(opaque, offset + 1);
 410         return val;
 411     }
 412     return m5206_mbar_read(s, offset);
 413 }
 414
 415 static uint32_t m5206_mbar_readl(void *opaque, target_phys_addr_t offset)
 416 {
 417     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 418     int width;
 419     offset &= 0x3ff;
 420     if (offset > 0x200) {
 421         hw_error("Bad MBAR read offset 0x%x", (int)offset);
 422     }
 423     width = m5206_mbar_width[offset >> 2];
 424     if (width < 4) {
 425         uint32_t val;
 426         val = m5206_mbar_readw(opaque, offset) << 16;
 427         val |= m5206_mbar_readw(opaque, offset + 2);
 428         return val;
 429     }
 430     return m5206_mbar_read(s, offset);
 431 }
 432
 433 static void m5206_mbar_writew(void *opaque, target_phys_addr_t offset,
 434                               uint32_t value);
 435 static void m5206_mbar_writel(void *opaque, target_phys_addr_t offset,
 436                               uint32_t value);
 437
 438 static void m5206_mbar_writeb(void *opaque, target_phys_addr_t offset,
 439                               uint32_t value)
 440 {
 441     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 442     int width;
 443     offset &= 0x3ff;
 444     if (offset > 0x200) {
 445         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 446     }
 447     width = m5206_mbar_width[offset >> 2];
 448     if (width > 1) {
 449         uint32_t tmp;
 450         tmp = m5206_mbar_readw(opaque, offset & ~1);
 451         if (offset & 1) {
 452             tmp = (tmp & 0xff00) | value;
 453         } else {
 454             tmp = (tmp & 0x00ff) | (value << 8);
 455         }
 456         m5206_mbar_writew(opaque, offset & ~1, tmp);
 457         return;
 458     }
 459     m5206_mbar_write(s, offset, value);
 460 }
 461
 462 static void m5206_mbar_writew(void *opaque, target_phys_addr_t offset,
 463                               uint32_t value)
 464 {
 465     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 466     int width;
 467     offset &= 0x3ff;
 468     if (offset > 0x200) {
 469         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 470     }
 471     width = m5206_mbar_width[offset >> 2];
 472     if (width > 2) {
 473         uint32_t tmp;
 474         tmp = m5206_mbar_readl(opaque, offset & ~3);
 475         if (offset & 3) {
 476             tmp = (tmp & 0xffff0000) | value;
 477         } else {
 478             tmp = (tmp & 0x0000ffff) | (value << 16);
 479         }
 480         m5206_mbar_writel(opaque, offset & ~3, tmp);
 481         return;
 482     } else if (width < 2) {
 483         m5206_mbar_writeb(opaque, offset, value >> 8);
 484         m5206_mbar_writeb(opaque, offset + 1, value & 0xff);
 485         return;
 486     }
 487     m5206_mbar_write(s, offset, value);
 488 }
 489
 490 static void m5206_mbar_writel(void *opaque, target_phys_addr_t offset,
 491                               uint32_t value)
 492 {
 493     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 494     int width;
 495     offset &= 0x3ff;
 496     if (offset > 0x200) {
 497         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 498     }
 499     width = m5206_mbar_width[offset >> 2];
 500     if (width < 4) {
 501         m5206_mbar_writew(opaque, offset, value >> 16);
 502         m5206_mbar_writew(opaque, offset + 2, value & 0xffff);
 503         return;
 504     }
 505     m5206_mbar_write(s, offset, value);
 506 }
 507
 508 static CPUReadMemoryFunc * const m5206_mbar_readfn[] = {
 509    m5206_mbar_readb,
 510    m5206_mbar_readw,
 511    m5206_mbar_readl
 512 };
 513
 514 static CPUWriteMemoryFunc * const m5206_mbar_writefn[] = {
 515    m5206_mbar_writeb,
 516    m5206_mbar_writew,
 517    m5206_mbar_writel
 518 };
 519
 520 qemu_irq *mcf5206_init(uint32_t base, CPUState *env)
 521 {
 522     m5206_mbar_state *s;
 523     qemu_irq *pic;
 524     int iomemtype;
 525
 526     s = (m5206_mbar_state *)qemu_mallocz(sizeof(m5206_mbar_state));
 527     iomemtype = cpu_register_io_memory(m5206_mbar_readfn,
 528                                        m5206_mbar_writefn, s);
 529     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 530
 531     pic = qemu_allocate_irqs(m5206_mbar_set_irq, s, 14);
 532     s->timer[0] = m5206_timer_init(pic[9]);
 533     s->timer[1] = m5206_timer_init(pic[10]);
 534     s->uart[0] = mcf_uart_init(pic[12], serial_hds[0]);
 535     s->uart[1] = mcf_uart_init(pic[13], serial_hds[1]);
 536     s->env = env;
 537
 538     m5206_mbar_reset(s);
 539     return pic;
 540 }