hw/pxa2xx_timer.c

   1 /*
   2  * Intel XScale PXA255/270 OS Timers.
   3  *
   4  * Copyright (c) 2006 Openedhand Ltd.
   5  * Copyright (c) 2006 Thorsten Zitterell
   6  *
   7  * This code is licenced under the GPL.
   8  */
   9
  10 #include "hw.h"
  11 #include "qemu-timer.h"
  12 #include "sysemu.h"
  13 #include "pxa.h"
  14
  15 #define OSMR0   0x00
  16 #define OSMR1   0x04
  17 #define OSMR2   0x08
  18 #define OSMR3   0x0c
  19 #define OSMR4   0x80
  20 #define OSMR5   0x84
  21 #define OSMR6   0x88
  22 #define OSMR7   0x8c
  23 #define OSMR8   0x90
  24 #define OSMR9   0x94
  25 #define OSMR10  0x98
  26 #define OSMR11  0x9c
  27 #define OSCR    0x10    /* OS Timer Count */
  28 #define OSCR4   0x40
  29 #define OSCR5   0x44
  30 #define OSCR6   0x48
  31 #define OSCR7   0x4c
  32 #define OSCR8   0x50
  33 #define OSCR9   0x54
  34 #define OSCR10  0x58
  35 #define OSCR11  0x5c
  36 #define OSSR    0x14    /* Timer status register */
  37 #define OWER    0x18
  38 #define OIER    0x1c    /* Interrupt enable register  3-0 to E3-E0 */
  39 #define OMCR4   0xc0    /* OS Match Control registers */
  40 #define OMCR5   0xc4
  41 #define OMCR6   0xc8
  42 #define OMCR7   0xcc
  43 #define OMCR8   0xd0
  44 #define OMCR9   0xd4
  45 #define OMCR10  0xd8
  46 #define OMCR11  0xdc
  47 #define OSNR    0x20
  48
  49 #define PXA25X_FREQ     3686400 /* 3.6864 MHz */
  50 #define PXA27X_FREQ     3250000 /* 3.25 MHz */
  51
  52 static int pxa2xx_timer4_freq[8] = {
  53     [0] = 0,
  54     [1] = 32768,
  55     [2] = 1000,
  56     [3] = 1,
  57     [4] = 1000000,
  58     /* [5] is the "Externally supplied clock".  Assign if necessary.  */
  59     [5 ... 7] = 0,
  60 };
  61
  62 typedef struct {
  63     uint32_t value;
  64     int level;
  65     qemu_irq irq;
  66     QEMUTimer *qtimer;
  67     int num;
  68     void *info;
  69 } PXA2xxTimer0;
  70
  71 typedef struct {
  72     PXA2xxTimer0 tm;
  73     int32_t oldclock;
  74     int32_t clock;
  75     uint64_t lastload;
  76     uint32_t freq;
  77     uint32_t control;
  78 } PXA2xxTimer4;
  79
  80 typedef struct {
  81     int32_t clock;
  82     int32_t oldclock;
  83     uint64_t lastload;
  84     uint32_t freq;
  85     PXA2xxTimer0 timer[4];
  86     PXA2xxTimer4 *tm4;
  87     uint32_t events;
  88     uint32_t irq_enabled;
  89     uint32_t reset3;
  90     uint32_t snapshot;
  91 } pxa2xx_timer_info;
  92
  93 static void pxa2xx_timer_update(void *opaque, uint64_t now_qemu)
  94 {
  95     pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
  96     int i;
  97     uint32_t now_vm;
  98     uint64_t new_qemu;
  99
 100     now_vm = s->clock +
 101             muldiv64(now_qemu - s->lastload, s->freq, get_ticks_per_sec());
 102
 103     for (i = 0; i < 4; i ++) {
 104         new_qemu = now_qemu + muldiv64((uint32_t) (s->timer[i].value - now_vm),
 105                         get_ticks_per_sec(), s->freq);
 106         qemu_mod_timer(s->timer[i].qtimer, new_qemu);
 107     }
 108 }
 109
 110 static void pxa2xx_timer_update4(void *opaque, uint64_t now_qemu, int n)
 111 {
 112     pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
 113     uint32_t now_vm;
 114     uint64_t new_qemu;
 115     static const int counters[8] = { 0, 0, 0, 0, 4, 4, 6, 6 };
 116     int counter;
 117
 118     if (s->tm4[n].control & (1 << 7))
 119         counter = n;
 120     else
 121         counter = counters[n];
 122
 123     if (!s->tm4[counter].freq) {
 124         qemu_del_timer(s->tm4[n].tm.qtimer);
 125         return;
 126     }
 127
 128     now_vm = s->tm4[counter].clock + muldiv64(now_qemu -
 129                     s->tm4[counter].lastload,
 130                     s->tm4[counter].freq, get_ticks_per_sec());
 131
 132     new_qemu = now_qemu + muldiv64((uint32_t) (s->tm4[n].tm.value - now_vm),
 133                     get_ticks_per_sec(), s->tm4[counter].freq);
 134     qemu_mod_timer(s->tm4[n].tm.qtimer, new_qemu);
 135 }
 136
 137 static uint32_t pxa2xx_timer_read(void *opaque, target_phys_addr_t offset)
 138 {
 139     pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
 140     int tm = 0;
 141
 142     switch (offset) {
 143     case OSMR3:  tm ++;
 144     case OSMR2:  tm ++;
 145     case OSMR1:  tm ++;
 146     case OSMR0:
 147         return s->timer[tm].value;
 148     case OSMR11: tm ++;
 149     case OSMR10: tm ++;
 150     case OSMR9:  tm ++;
 151     case OSMR8:  tm ++;
 152     case OSMR7:  tm ++;
 153     case OSMR6:  tm ++;
 154     case OSMR5:  tm ++;
 155     case OSMR4:
 156         if (!s->tm4)
 157             goto badreg;
 158         return s->tm4[tm].tm.value;
 159     case OSCR:
 160         return s->clock + muldiv64(qemu_get_clock(vm_clock) -
 161                         s->lastload, s->freq, get_ticks_per_sec());
 162     case OSCR11: tm ++;
 163     case OSCR10: tm ++;
 164     case OSCR9:  tm ++;
 165     case OSCR8:  tm ++;
 166     case OSCR7:  tm ++;
 167     case OSCR6:  tm ++;
 168     case OSCR5:  tm ++;
 169     case OSCR4:
 170         if (!s->tm4)
 171             goto badreg;
 172
 173         if ((tm == 9 - 4 || tm == 11 - 4) && (s->tm4[tm].control & (1 << 9))) {
 174             if (s->tm4[tm - 1].freq)
 175                 s->snapshot = s->tm4[tm - 1].clock + muldiv64(
 176                                 qemu_get_clock(vm_clock) -
 177                                 s->tm4[tm - 1].lastload,
 178                                 s->tm4[tm - 1].freq, get_ticks_per_sec());
 179             else
 180                 s->snapshot = s->tm4[tm - 1].clock;
 181         }
 182
 183         if (!s->tm4[tm].freq)
 184             return s->tm4[tm].clock;
 185         return s->tm4[tm].clock + muldiv64(qemu_get_clock(vm_clock) -
 186                         s->tm4[tm].lastload, s->tm4[tm].freq, get_ticks_per_sec());
 187     case OIER:
 188         return s->irq_enabled;
 189     case OSSR:  /* Status register */
 190         return s->events;
 191     case OWER:
 192         return s->reset3;
 193     case OMCR11: tm ++;
 194     case OMCR10: tm ++;
 195     case OMCR9:  tm ++;
 196     case OMCR8:  tm ++;
 197     case OMCR7:  tm ++;
 198     case OMCR6:  tm ++;
 199     case OMCR5:  tm ++;
 200     case OMCR4:
 201         if (!s->tm4)
 202             goto badreg;
 203         return s->tm4[tm].control;
 204     case OSNR:
 205         return s->snapshot;
 206     default:
 207     badreg:
 208         hw_error("pxa2xx_timer_read: Bad offset " REG_FMT "\n", offset);
 209     }
 210
 211     return 0;
 212 }
 213
 214 static void pxa2xx_timer_write(void *opaque, target_phys_addr_t offset,
 215                 uint32_t value)
 216 {
 217     int i, tm = 0;
 218     pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
 219
 220     switch (offset) {
 221     case OSMR3:  tm ++;
 222     case OSMR2:  tm ++;
 223     case OSMR1:  tm ++;
 224     case OSMR0:
 225         s->timer[tm].value = value;
 226         pxa2xx_timer_update(s, qemu_get_clock(vm_clock));
 227         break;
 228     case OSMR11: tm ++;
 229     case OSMR10: tm ++;
 230     case OSMR9:  tm ++;
 231     case OSMR8:  tm ++;
 232     case OSMR7:  tm ++;
 233     case OSMR6:  tm ++;
 234     case OSMR5:  tm ++;
 235     case OSMR4:
 236         if (!s->tm4)
 237             goto badreg;
 238         s->tm4[tm].tm.value = value;
 239         pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
 240         break;
 241     case OSCR:
 242         s->oldclock = s->clock;
 243         s->lastload = qemu_get_clock(vm_clock);
 244         s->clock = value;
 245         pxa2xx_timer_update(s, s->lastload);
 246         break;
 247     case OSCR11: tm ++;
 248     case OSCR10: tm ++;
 249     case OSCR9:  tm ++;
 250     case OSCR8:  tm ++;
 251     case OSCR7:  tm ++;
 252     case OSCR6:  tm ++;
 253     case OSCR5:  tm ++;
 254     case OSCR4:
 255         if (!s->tm4)
 256             goto badreg;
 257         s->tm4[tm].oldclock = s->tm4[tm].clock;
 258         s->tm4[tm].lastload = qemu_get_clock(vm_clock);
 259         s->tm4[tm].clock = value;
 260         pxa2xx_timer_update4(s, s->tm4[tm].lastload, tm);
 261         break;
 262     case OIER:
 263         s->irq_enabled = value & 0xfff;
 264         break;
 265     case OSSR:  /* Status register */
 266         s->events &= ~value;
 267         for (i = 0; i < 4; i ++, value >>= 1) {
 268             if (s->timer[i].level && (value & 1)) {
 269                 s->timer[i].level = 0;
 270                 qemu_irq_lower(s->timer[i].irq);
 271             }
 272         }
 273         if (s->tm4) {
 274             for (i = 0; i < 8; i ++, value >>= 1)
 275                 if (s->tm4[i].tm.level && (value & 1))
 276                     s->tm4[i].tm.level = 0;
 277             if (!(s->events & 0xff0))
 278                 qemu_irq_lower(s->tm4->tm.irq);
 279         }
 280         break;
 281     case OWER:  /* XXX: Reset on OSMR3 match? */
 282         s->reset3 = value;
 283         break;
 284     case OMCR7:  tm ++;
 285     case OMCR6:  tm ++;
 286     case OMCR5:  tm ++;
 287     case OMCR4:
 288         if (!s->tm4)
 289             goto badreg;
 290         s->tm4[tm].control = value & 0x0ff;
 291         /* XXX Stop if running (shouldn't happen) */
 292         if ((value & (1 << 7)) || tm == 0)
 293             s->tm4[tm].freq = pxa2xx_timer4_freq[value & 7];
 294         else {
 295             s->tm4[tm].freq = 0;
 296             pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
 297         }
 298         break;
 299     case OMCR11: tm ++;
 300     case OMCR10: tm ++;
 301     case OMCR9:  tm ++;
 302     case OMCR8:  tm += 4;
 303         if (!s->tm4)
 304             goto badreg;
 305         s->tm4[tm].control = value & 0x3ff;
 306         /* XXX Stop if running (shouldn't happen) */
 307         if ((value & (1 << 7)) || !(tm & 1))
 308             s->tm4[tm].freq =
 309                     pxa2xx_timer4_freq[(value & (1 << 8)) ?  0 : (value & 7)];
 310         else {
 311             s->tm4[tm].freq = 0;
 312             pxa2xx_timer_update4(s, qemu_get_clock(vm_clock), tm);
 313         }
 314         break;
 315     default:
 316     badreg:
 317         hw_error("pxa2xx_timer_write: Bad offset " REG_FMT "\n", offset);
 318     }
 319 }
 320
 321 static CPUReadMemoryFunc * const pxa2xx_timer_readfn[] = {
 322     pxa2xx_timer_read,
 323     pxa2xx_timer_read,
 324     pxa2xx_timer_read,
 325 };
 326
 327 static CPUWriteMemoryFunc * const pxa2xx_timer_writefn[] = {
 328     pxa2xx_timer_write,
 329     pxa2xx_timer_write,
 330     pxa2xx_timer_write,
 331 };
 332
 333 static void pxa2xx_timer_tick(void *opaque)
 334 {
 335     PXA2xxTimer0 *t = (PXA2xxTimer0 *) opaque;
 336     pxa2xx_timer_info *i = (pxa2xx_timer_info *) t->info;
 337
 338     if (i->irq_enabled & (1 << t->num)) {
 339         t->level = 1;
 340         i->events |= 1 << t->num;
 341         qemu_irq_raise(t->irq);
 342     }
 343
 344     if (t->num == 3)
 345         if (i->reset3 & 1) {
 346             i->reset3 = 0;
 347             qemu_system_reset_request();
 348         }
 349 }
 350
 351 static void pxa2xx_timer_tick4(void *opaque)
 352 {
 353     PXA2xxTimer4 *t = (PXA2xxTimer4 *) opaque;
 354     pxa2xx_timer_info *i = (pxa2xx_timer_info *) t->tm.info;
 355
 356     pxa2xx_timer_tick(&t->tm);
 357     if (t->control & (1 << 3))
 358         t->clock = 0;
 359     if (t->control & (1 << 6))
 360         pxa2xx_timer_update4(i, qemu_get_clock(vm_clock), t->tm.num - 4);
 361 }
 362
 363 static void pxa2xx_timer_save(QEMUFile *f, void *opaque)
 364 {
 365     pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
 366     int i;
 367
 368     qemu_put_be32s(f, (uint32_t *) &s->clock);
 369     qemu_put_be32s(f, (uint32_t *) &s->oldclock);
 370     qemu_put_be64s(f, &s->lastload);
 371
 372     for (i = 0; i < 4; i ++) {
 373         qemu_put_be32s(f, &s->timer[i].value);
 374         qemu_put_be32(f, s->timer[i].level);
 375     }
 376     if (s->tm4)
 377         for (i = 0; i < 8; i ++) {
 378             qemu_put_be32s(f, &s->tm4[i].tm.value);
 379             qemu_put_be32(f, s->tm4[i].tm.level);
 380             qemu_put_sbe32s(f, &s->tm4[i].oldclock);
 381             qemu_put_sbe32s(f, &s->tm4[i].clock);
 382             qemu_put_be64s(f, &s->tm4[i].lastload);
 383             qemu_put_be32s(f, &s->tm4[i].freq);
 384             qemu_put_be32s(f, &s->tm4[i].control);
 385         }
 386
 387     qemu_put_be32s(f, &s->events);
 388     qemu_put_be32s(f, &s->irq_enabled);
 389     qemu_put_be32s(f, &s->reset3);
 390     qemu_put_be32s(f, &s->snapshot);
 391 }
 392
 393 static int pxa2xx_timer_load(QEMUFile *f, void *opaque, int version_id)
 394 {
 395     pxa2xx_timer_info *s = (pxa2xx_timer_info *) opaque;
 396     int64_t now;
 397     int i;
 398
 399     qemu_get_be32s(f, (uint32_t *) &s->clock);
 400     qemu_get_be32s(f, (uint32_t *) &s->oldclock);
 401     qemu_get_be64s(f, &s->lastload);
 402
 403     now = qemu_get_clock(vm_clock);
 404     for (i = 0; i < 4; i ++) {
 405         qemu_get_be32s(f, &s->timer[i].value);
 406         s->timer[i].level = qemu_get_be32(f);
 407     }
 408     pxa2xx_timer_update(s, now);
 409
 410     if (s->tm4)
 411         for (i = 0; i < 8; i ++) {
 412             qemu_get_be32s(f, &s->tm4[i].tm.value);
 413             s->tm4[i].tm.level = qemu_get_be32(f);
 414             qemu_get_sbe32s(f, &s->tm4[i].oldclock);
 415             qemu_get_sbe32s(f, &s->tm4[i].clock);
 416             qemu_get_be64s(f, &s->tm4[i].lastload);
 417             qemu_get_be32s(f, &s->tm4[i].freq);
 418             qemu_get_be32s(f, &s->tm4[i].control);
 419             pxa2xx_timer_update4(s, now, i);
 420         }
 421
 422     qemu_get_be32s(f, &s->events);
 423     qemu_get_be32s(f, &s->irq_enabled);
 424     qemu_get_be32s(f, &s->reset3);
 425     qemu_get_be32s(f, &s->snapshot);
 426
 427     return 0;
 428 }
 429
 430 static pxa2xx_timer_info *pxa2xx_timer_init(target_phys_addr_t base,
 431                 qemu_irq *irqs)
 432 {
 433     int i;
 434     int iomemtype;
 435     pxa2xx_timer_info *s;
 436
 437     s = (pxa2xx_timer_info *) qemu_mallocz(sizeof(pxa2xx_timer_info));
 438     s->irq_enabled = 0;
 439     s->oldclock = 0;
 440     s->clock = 0;
 441     s->lastload = qemu_get_clock(vm_clock);
 442     s->reset3 = 0;
 443
 444     for (i = 0; i < 4; i ++) {
 445         s->timer[i].value = 0;
 446         s->timer[i].irq = irqs[i];
 447         s->timer[i].info = s;
 448         s->timer[i].num = i;
 449         s->timer[i].level = 0;
 450         s->timer[i].qtimer = qemu_new_timer(vm_clock,
 451                         pxa2xx_timer_tick, &s->timer[i]);
 452     }
 453
 454     iomemtype = cpu_register_io_memory(pxa2xx_timer_readfn,
 455                     pxa2xx_timer_writefn, s);
 456     cpu_register_physical_memory(base, 0x00001000, iomemtype);
 457
 458     register_savevm("pxa2xx_timer", 0, 0,
 459                     pxa2xx_timer_save, pxa2xx_timer_load, s);
 460
 461     return s;
 462 }
 463
 464 void pxa25x_timer_init(target_phys_addr_t base, qemu_irq *irqs)
 465 {
 466     pxa2xx_timer_info *s = pxa2xx_timer_init(base, irqs);
 467     s->freq = PXA25X_FREQ;
 468     s->tm4 = NULL;
 469 }
 470
 471 void pxa27x_timer_init(target_phys_addr_t base,
 472                 qemu_irq *irqs, qemu_irq irq4)
 473 {
 474     pxa2xx_timer_info *s = pxa2xx_timer_init(base, irqs);
 475     int i;
 476     s->freq = PXA27X_FREQ;
 477     s->tm4 = (PXA2xxTimer4 *) qemu_mallocz(8 *
 478                     sizeof(PXA2xxTimer4));
 479     for (i = 0; i < 8; i ++) {
 480         s->tm4[i].tm.value = 0;
 481         s->tm4[i].tm.irq = irq4;
 482         s->tm4[i].tm.info = s;
 483         s->tm4[i].tm.num = i + 4;
 484         s->tm4[i].tm.level = 0;
 485         s->tm4[i].freq = 0;
 486         s->tm4[i].control = 0x0;
 487         s->tm4[i].tm.qtimer = qemu_new_timer(vm_clock,
 488                         pxa2xx_timer_tick4, &s->tm4[i]);
 489     }
 490 }