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 "qemu/osdep.h"
   9 #include "qemu/error-report.h"
  10 #include "qemu-common.h"
  11 #include "cpu.h"
  12 #include "hw/hw.h"
  13 #include "hw/m68k/mcf.h"
  14 #include "qemu/timer.h"
  15 #include "hw/ptimer.h"
  16 #include "sysemu/sysemu.h"
  17 #include "exec/address-spaces.h"
  18
  19 /* General purpose timer module.  */
  20 typedef struct {
  21     uint16_t tmr;
  22     uint16_t trr;
  23     uint16_t tcr;
  24     uint16_t ter;
  25     ptimer_state *timer;
  26     qemu_irq irq;
  27     int irq_state;
  28 } m5206_timer_state;
  29
  30 #define TMR_RST 0x01
  31 #define TMR_CLK 0x06
  32 #define TMR_FRR 0x08
  33 #define TMR_ORI 0x10
  34 #define TMR_OM  0x20
  35 #define TMR_CE  0xc0
  36
  37 #define TER_CAP 0x01
  38 #define TER_REF 0x02
  39
  40 static void m5206_timer_update(m5206_timer_state *s)
  41 {
  42     if ((s->tmr & TMR_ORI) != 0 && (s->ter & TER_REF))
  43         qemu_irq_raise(s->irq);
  44     else
  45         qemu_irq_lower(s->irq);
  46 }
  47
  48 static void m5206_timer_reset(m5206_timer_state *s)
  49 {
  50     s->tmr = 0;
  51     s->trr = 0;
  52 }
  53
  54 static void m5206_timer_recalibrate(m5206_timer_state *s)
  55 {
  56     int prescale;
  57     int mode;
  58
  59     ptimer_stop(s->timer);
  60
  61     if ((s->tmr & TMR_RST) == 0)
  62         return;
  63
  64     prescale = (s->tmr >> 8) + 1;
  65     mode = (s->tmr >> 1) & 3;
  66     if (mode == 2)
  67         prescale *= 16;
  68
  69     if (mode == 3 || mode == 0)
  70         hw_error("m5206_timer: mode %d not implemented\n", mode);
  71     if ((s->tmr & TMR_FRR) == 0)
  72         hw_error("m5206_timer: free running mode not implemented\n");
  73
  74     /* Assume 66MHz system clock.  */
  75     ptimer_set_freq(s->timer, 66000000 / prescale);
  76
  77     ptimer_set_limit(s->timer, s->trr, 0);
  78
  79     ptimer_run(s->timer, 0);
  80 }
  81
  82 static void m5206_timer_trigger(void *opaque)
  83 {
  84     m5206_timer_state *s = (m5206_timer_state *)opaque;
  85     s->ter |= TER_REF;
  86     m5206_timer_update(s);
  87 }
  88
  89 static uint32_t m5206_timer_read(m5206_timer_state *s, uint32_t addr)
  90 {
  91     switch (addr) {
  92     case 0:
  93         return s->tmr;
  94     case 4:
  95         return s->trr;
  96     case 8:
  97         return s->tcr;
  98     case 0xc:
  99         return s->trr - ptimer_get_count(s->timer);
 100     case 0x11:
 101         return s->ter;
 102     default:
 103         return 0;
 104     }
 105 }
 106
 107 static void m5206_timer_write(m5206_timer_state *s, uint32_t addr, uint32_t val)
 108 {
 109     switch (addr) {
 110     case 0:
 111         if ((s->tmr & TMR_RST) != 0 && (val & TMR_RST) == 0) {
 112             m5206_timer_reset(s);
 113         }
 114         s->tmr = val;
 115         m5206_timer_recalibrate(s);
 116         break;
 117     case 4:
 118         s->trr = val;
 119         m5206_timer_recalibrate(s);
 120         break;
 121     case 8:
 122         s->tcr = val;
 123         break;
 124     case 0xc:
 125         ptimer_set_count(s->timer, val);
 126         break;
 127     case 0x11:
 128         s->ter &= ~val;
 129         break;
 130     default:
 131         break;
 132     }
 133     m5206_timer_update(s);
 134 }
 135
 136 static m5206_timer_state *m5206_timer_init(qemu_irq irq)
 137 {
 138     m5206_timer_state *s;
 139     QEMUBH *bh;
 140
 141     s = g_new0(m5206_timer_state, 1);
 142     bh = qemu_bh_new(m5206_timer_trigger, s);
 143     s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
 144     s->irq = irq;
 145     m5206_timer_reset(s);
 146     return s;
 147 }
 148
 149 /* System Integration Module.  */
 150
 151 typedef struct {
 152     M68kCPU *cpu;
 153     MemoryRegion iomem;
 154     m5206_timer_state *timer[2];
 155     void *uart[2];
 156     uint8_t scr;
 157     uint8_t icr[14];
 158     uint16_t imr; /* 1 == interrupt is masked.  */
 159     uint16_t ipr;
 160     uint8_t rsr;
 161     uint8_t swivr;
 162     uint8_t par;
 163     /* Include the UART vector registers here.  */
 164     uint8_t uivr[2];
 165 } m5206_mbar_state;
 166
 167 /* Interrupt controller.  */
 168
 169 static int m5206_find_pending_irq(m5206_mbar_state *s)
 170 {
 171     int level;
 172     int vector;
 173     uint16_t active;
 174     int i;
 175
 176     level = 0;
 177     vector = 0;
 178     active = s->ipr & ~s->imr;
 179     if (!active)
 180         return 0;
 181
 182     for (i = 1; i < 14; i++) {
 183         if (active & (1 << i)) {
 184             if ((s->icr[i] & 0x1f) > level) {
 185                 level = s->icr[i] & 0x1f;
 186                 vector = i;
 187             }
 188         }
 189     }
 190
 191     if (level < 4)
 192         vector = 0;
 193
 194     return vector;
 195 }
 196
 197 static void m5206_mbar_update(m5206_mbar_state *s)
 198 {
 199     int irq;
 200     int vector;
 201     int level;
 202
 203     irq = m5206_find_pending_irq(s);
 204     if (irq) {
 205         int tmp;
 206         tmp = s->icr[irq];
 207         level = (tmp >> 2) & 7;
 208         if (tmp & 0x80) {
 209             /* Autovector.  */
 210             vector = 24 + level;
 211         } else {
 212             switch (irq) {
 213             case 8: /* SWT */
 214                 vector = s->swivr;
 215                 break;
 216             case 12: /* UART1 */
 217                 vector = s->uivr[0];
 218                 break;
 219             case 13: /* UART2 */
 220                 vector = s->uivr[1];
 221                 break;
 222             default:
 223                 /* Unknown vector.  */
 224                 error_report("Unhandled vector for IRQ %d", irq);
 225                 vector = 0xf;
 226                 break;
 227             }
 228         }
 229     } else {
 230         level = 0;
 231         vector = 0;
 232     }
 233     m68k_set_irq_level(s->cpu, level, vector);
 234 }
 235
 236 static void m5206_mbar_set_irq(void *opaque, int irq, int level)
 237 {
 238     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 239     if (level) {
 240         s->ipr |= 1 << irq;
 241     } else {
 242         s->ipr &= ~(1 << irq);
 243     }
 244     m5206_mbar_update(s);
 245 }
 246
 247 /* System Integration Module.  */
 248
 249 static void m5206_mbar_reset(m5206_mbar_state *s)
 250 {
 251     s->scr = 0xc0;
 252     s->icr[1] = 0x04;
 253     s->icr[2] = 0x08;
 254     s->icr[3] = 0x0c;
 255     s->icr[4] = 0x10;
 256     s->icr[5] = 0x14;
 257     s->icr[6] = 0x18;
 258     s->icr[7] = 0x1c;
 259     s->icr[8] = 0x1c;
 260     s->icr[9] = 0x80;
 261     s->icr[10] = 0x80;
 262     s->icr[11] = 0x80;
 263     s->icr[12] = 0x00;
 264     s->icr[13] = 0x00;
 265     s->imr = 0x3ffe;
 266     s->rsr = 0x80;
 267     s->swivr = 0x0f;
 268     s->par = 0;
 269 }
 270
 271 static uint64_t m5206_mbar_read(m5206_mbar_state *s,
 272                                 uint64_t offset, unsigned size)
 273 {
 274     if (offset >= 0x100 && offset < 0x120) {
 275         return m5206_timer_read(s->timer[0], offset - 0x100);
 276     } else if (offset >= 0x120 && offset < 0x140) {
 277         return m5206_timer_read(s->timer[1], offset - 0x120);
 278     } else if (offset >= 0x140 && offset < 0x160) {
 279         return mcf_uart_read(s->uart[0], offset - 0x140, size);
 280     } else if (offset >= 0x180 && offset < 0x1a0) {
 281         return mcf_uart_read(s->uart[1], offset - 0x180, size);
 282     }
 283     switch (offset) {
 284     case 0x03: return s->scr;
 285     case 0x14 ... 0x20: return s->icr[offset - 0x13];
 286     case 0x36: return s->imr;
 287     case 0x3a: return s->ipr;
 288     case 0x40: return s->rsr;
 289     case 0x41: return 0;
 290     case 0x42: return s->swivr;
 291     case 0x50:
 292         /* DRAM mask register.  */
 293         /* FIXME: currently hardcoded to 128Mb.  */
 294         {
 295             uint32_t mask = ~0;
 296             while (mask > ram_size)
 297                 mask >>= 1;
 298             return mask & 0x0ffe0000;
 299         }
 300     case 0x5c: return 1; /* DRAM bank 1 empty.  */
 301     case 0xcb: return s->par;
 302     case 0x170: return s->uivr[0];
 303     case 0x1b0: return s->uivr[1];
 304     }
 305     hw_error("Bad MBAR read offset 0x%x", (int)offset);
 306     return 0;
 307 }
 308
 309 static void m5206_mbar_write(m5206_mbar_state *s, uint32_t offset,
 310                              uint64_t value, unsigned size)
 311 {
 312     if (offset >= 0x100 && offset < 0x120) {
 313         m5206_timer_write(s->timer[0], offset - 0x100, value);
 314         return;
 315     } else if (offset >= 0x120 && offset < 0x140) {
 316         m5206_timer_write(s->timer[1], offset - 0x120, value);
 317         return;
 318     } else if (offset >= 0x140 && offset < 0x160) {
 319         mcf_uart_write(s->uart[0], offset - 0x140, value, size);
 320         return;
 321     } else if (offset >= 0x180 && offset < 0x1a0) {
 322         mcf_uart_write(s->uart[1], offset - 0x180, value, size);
 323         return;
 324     }
 325     switch (offset) {
 326     case 0x03:
 327         s->scr = value;
 328         break;
 329     case 0x14 ... 0x20:
 330         s->icr[offset - 0x13] = value;
 331         m5206_mbar_update(s);
 332         break;
 333     case 0x36:
 334         s->imr = value;
 335         m5206_mbar_update(s);
 336         break;
 337     case 0x40:
 338         s->rsr &= ~value;
 339         break;
 340     case 0x41:
 341         /* TODO: implement watchdog.  */
 342         break;
 343     case 0x42:
 344         s->swivr = value;
 345         break;
 346     case 0xcb:
 347         s->par = value;
 348         break;
 349     case 0x170:
 350         s->uivr[0] = value;
 351         break;
 352     case 0x178: case 0x17c: case 0x1c8: case 0x1bc:
 353         /* Not implemented: UART Output port bits.  */
 354         break;
 355     case 0x1b0:
 356         s->uivr[1] = value;
 357         break;
 358     default:
 359         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 360         break;
 361     }
 362 }
 363
 364 /* Internal peripherals use a variety of register widths.
 365    This lookup table allows a single routine to handle all of them.  */
 366 static const uint8_t m5206_mbar_width[] =
 367 {
 368   /* 000-040 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  2, 2, 2, 2,
 369   /* 040-080 */ 1, 2, 2, 2,  4, 1, 2, 4,  1, 2, 4, 2,  2, 4, 2, 2,
 370   /* 080-0c0 */ 4, 2, 2, 4,  2, 2, 4, 2,  2, 4, 2, 2,  4, 2, 2, 4,
 371   /* 0c0-100 */ 2, 2, 1, 0,  0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0, 0,
 372   /* 100-140 */ 2, 2, 2, 2,  1, 0, 0, 0,  2, 2, 2, 2,  1, 0, 0, 0,
 373   /* 140-180 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
 374   /* 180-1c0 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
 375   /* 1c0-200 */ 1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,  1, 1, 1, 1,
 376 };
 377
 378 static uint32_t m5206_mbar_readw(void *opaque, hwaddr offset);
 379 static uint32_t m5206_mbar_readl(void *opaque, hwaddr offset);
 380
 381 static uint32_t m5206_mbar_readb(void *opaque, hwaddr offset)
 382 {
 383     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 384     offset &= 0x3ff;
 385     if (offset >= 0x200) {
 386         hw_error("Bad MBAR read offset 0x%x", (int)offset);
 387     }
 388     if (m5206_mbar_width[offset >> 2] > 1) {
 389         uint16_t val;
 390         val = m5206_mbar_readw(opaque, offset & ~1);
 391         if ((offset & 1) == 0) {
 392             val >>= 8;
 393         }
 394         return val & 0xff;
 395     }
 396     return m5206_mbar_read(s, offset, 1);
 397 }
 398
 399 static uint32_t m5206_mbar_readw(void *opaque, hwaddr offset)
 400 {
 401     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 402     int width;
 403     offset &= 0x3ff;
 404     if (offset >= 0x200) {
 405         hw_error("Bad MBAR read offset 0x%x", (int)offset);
 406     }
 407     width = m5206_mbar_width[offset >> 2];
 408     if (width > 2) {
 409         uint32_t val;
 410         val = m5206_mbar_readl(opaque, offset & ~3);
 411         if ((offset & 3) == 0)
 412             val >>= 16;
 413         return val & 0xffff;
 414     } else if (width < 2) {
 415         uint16_t val;
 416         val = m5206_mbar_readb(opaque, offset) << 8;
 417         val |= m5206_mbar_readb(opaque, offset + 1);
 418         return val;
 419     }
 420     return m5206_mbar_read(s, offset, 2);
 421 }
 422
 423 static uint32_t m5206_mbar_readl(void *opaque, hwaddr offset)
 424 {
 425     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 426     int width;
 427     offset &= 0x3ff;
 428     if (offset >= 0x200) {
 429         hw_error("Bad MBAR read offset 0x%x", (int)offset);
 430     }
 431     width = m5206_mbar_width[offset >> 2];
 432     if (width < 4) {
 433         uint32_t val;
 434         val = m5206_mbar_readw(opaque, offset) << 16;
 435         val |= m5206_mbar_readw(opaque, offset + 2);
 436         return val;
 437     }
 438     return m5206_mbar_read(s, offset, 4);
 439 }
 440
 441 static void m5206_mbar_writew(void *opaque, hwaddr offset,
 442                               uint32_t value);
 443 static void m5206_mbar_writel(void *opaque, hwaddr offset,
 444                               uint32_t value);
 445
 446 static void m5206_mbar_writeb(void *opaque, hwaddr offset,
 447                               uint32_t value)
 448 {
 449     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 450     int width;
 451     offset &= 0x3ff;
 452     if (offset >= 0x200) {
 453         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 454     }
 455     width = m5206_mbar_width[offset >> 2];
 456     if (width > 1) {
 457         uint32_t tmp;
 458         tmp = m5206_mbar_readw(opaque, offset & ~1);
 459         if (offset & 1) {
 460             tmp = (tmp & 0xff00) | value;
 461         } else {
 462             tmp = (tmp & 0x00ff) | (value << 8);
 463         }
 464         m5206_mbar_writew(opaque, offset & ~1, tmp);
 465         return;
 466     }
 467     m5206_mbar_write(s, offset, value, 1);
 468 }
 469
 470 static void m5206_mbar_writew(void *opaque, hwaddr offset,
 471                               uint32_t value)
 472 {
 473     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 474     int width;
 475     offset &= 0x3ff;
 476     if (offset >= 0x200) {
 477         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 478     }
 479     width = m5206_mbar_width[offset >> 2];
 480     if (width > 2) {
 481         uint32_t tmp;
 482         tmp = m5206_mbar_readl(opaque, offset & ~3);
 483         if (offset & 3) {
 484             tmp = (tmp & 0xffff0000) | value;
 485         } else {
 486             tmp = (tmp & 0x0000ffff) | (value << 16);
 487         }
 488         m5206_mbar_writel(opaque, offset & ~3, tmp);
 489         return;
 490     } else if (width < 2) {
 491         m5206_mbar_writeb(opaque, offset, value >> 8);
 492         m5206_mbar_writeb(opaque, offset + 1, value & 0xff);
 493         return;
 494     }
 495     m5206_mbar_write(s, offset, value, 2);
 496 }
 497
 498 static void m5206_mbar_writel(void *opaque, hwaddr offset,
 499                               uint32_t value)
 500 {
 501     m5206_mbar_state *s = (m5206_mbar_state *)opaque;
 502     int width;
 503     offset &= 0x3ff;
 504     if (offset >= 0x200) {
 505         hw_error("Bad MBAR write offset 0x%x", (int)offset);
 506     }
 507     width = m5206_mbar_width[offset >> 2];
 508     if (width < 4) {
 509         m5206_mbar_writew(opaque, offset, value >> 16);
 510         m5206_mbar_writew(opaque, offset + 2, value & 0xffff);
 511         return;
 512     }
 513     m5206_mbar_write(s, offset, value, 4);
 514 }
 515
 516 static const MemoryRegionOps m5206_mbar_ops = {
 517     .old_mmio = {
 518         .read = {
 519             m5206_mbar_readb,
 520             m5206_mbar_readw,
 521             m5206_mbar_readl,
 522         },
 523         .write = {
 524             m5206_mbar_writeb,
 525             m5206_mbar_writew,
 526             m5206_mbar_writel,
 527         },
 528     },
 529     .endianness = DEVICE_NATIVE_ENDIAN,
 530 };
 531
 532 qemu_irq *mcf5206_init(MemoryRegion *sysmem, uint32_t base, M68kCPU *cpu)
 533 {
 534     m5206_mbar_state *s;
 535     qemu_irq *pic;
 536
 537     s = g_new0(m5206_mbar_state, 1);
 538
 539     memory_region_init_io(&s->iomem, NULL, &m5206_mbar_ops, s,
 540                           "mbar", 0x00001000);
 541     memory_region_add_subregion(sysmem, base, &s->iomem);
 542
 543     pic = qemu_allocate_irqs(m5206_mbar_set_irq, s, 14);
 544     s->timer[0] = m5206_timer_init(pic[9]);
 545     s->timer[1] = m5206_timer_init(pic[10]);
 546     s->uart[0] = mcf_uart_init(pic[12], serial_hd(0));
 547     s->uart[1] = mcf_uart_init(pic[13], serial_hd(1));
 548     s->cpu = cpu;
 549
 550     m5206_mbar_reset(s);
 551     return pic;
 552 }