hw/timer/sh_timer.c

   1 /*
   2  * SuperH Timer modules.
   3  *
   4  * Copyright (c) 2007 Magnus Damm
   5  * Based on arm_timer.c by Paul Brook
   6  * Copyright (c) 2005-2006 CodeSourcery.
   7  *
   8  * This code is licensed under the GPL.
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include "exec/memory.h"
  13 #include "qemu/log.h"
  14 #include "hw/irq.h"
  15 #include "hw/sh4/sh.h"
  16 #include "hw/timer/tmu012.h"
  17 #include "hw/ptimer.h"
  18 #include "trace.h"
  19
  20 #define TIMER_TCR_TPSC          (7 << 0)
  21 #define TIMER_TCR_CKEG          (3 << 3)
  22 #define TIMER_TCR_UNIE          (1 << 5)
  23 #define TIMER_TCR_ICPE          (3 << 6)
  24 #define TIMER_TCR_UNF           (1 << 8)
  25 #define TIMER_TCR_ICPF          (1 << 9)
  26 #define TIMER_TCR_RESERVED      (0x3f << 10)
  27
  28 #define TIMER_FEAT_CAPT   (1 << 0)
  29 #define TIMER_FEAT_EXTCLK (1 << 1)
  30
  31 #define OFFSET_TCOR   0
  32 #define OFFSET_TCNT   1
  33 #define OFFSET_TCR    2
  34 #define OFFSET_TCPR   3
  35
  36 typedef struct {
  37     ptimer_state *timer;
  38     uint32_t tcnt;
  39     uint32_t tcor;
  40     uint32_t tcr;
  41     uint32_t tcpr;
  42     int freq;
  43     int int_level;
  44     int old_level;
  45     int feat;
  46     int enabled;
  47     qemu_irq irq;
  48 } SHTimerState;
  49
  50 /* Check all active timers, and schedule the next timer interrupt. */
  51
  52 static void sh_timer_update(SHTimerState *s)
  53 {
  54     int new_level = s->int_level && (s->tcr & TIMER_TCR_UNIE);
  55
  56     if (new_level != s->old_level) {
  57         qemu_set_irq(s->irq, new_level);
  58     }
  59     s->old_level = s->int_level;
  60     s->int_level = new_level;
  61 }
  62
  63 static uint32_t sh_timer_read(void *opaque, hwaddr offset)
  64 {
  65     SHTimerState *s = opaque;
  66
  67     switch (offset >> 2) {
  68     case OFFSET_TCOR:
  69         return s->tcor;
  70     case OFFSET_TCNT:
  71         return ptimer_get_count(s->timer);
  72     case OFFSET_TCR:
  73         return s->tcr | (s->int_level ? TIMER_TCR_UNF : 0);
  74     case OFFSET_TCPR:
  75         if (s->feat & TIMER_FEAT_CAPT) {
  76             return s->tcpr;
  77         }
  78     }
  79     qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
  80                   __func__, offset);
  81     return 0;
  82 }
  83
  84 static void sh_timer_write(void *opaque, hwaddr offset, uint32_t value)
  85 {
  86     SHTimerState *s = opaque;
  87     int freq;
  88
  89     switch (offset >> 2) {
  90     case OFFSET_TCOR:
  91         s->tcor = value;
  92         ptimer_transaction_begin(s->timer);
  93         ptimer_set_limit(s->timer, s->tcor, 0);
  94         ptimer_transaction_commit(s->timer);
  95         break;
  96     case OFFSET_TCNT:
  97         s->tcnt = value;
  98         ptimer_transaction_begin(s->timer);
  99         ptimer_set_count(s->timer, s->tcnt);
 100         ptimer_transaction_commit(s->timer);
 101         break;
 102     case OFFSET_TCR:
 103         ptimer_transaction_begin(s->timer);
 104         if (s->enabled) {
 105             /*
 106              * Pause the timer if it is running. This may cause some inaccuracy
 107              * due to rounding, but avoids a whole lot of other messiness
 108              */
 109             ptimer_stop(s->timer);
 110         }
 111         freq = s->freq;
 112         /* ??? Need to recalculate expiry time after changing divisor.  */
 113         switch (value & TIMER_TCR_TPSC) {
 114         case 0:
 115             freq >>= 2;
 116             break;
 117         case 1:
 118             freq >>= 4;
 119             break;
 120         case 2:
 121             freq >>= 6;
 122             break;
 123         case 3:
 124             freq >>= 8;
 125             break;
 126         case 4:
 127             freq >>= 10;
 128             break;
 129         case 6:
 130         case 7:
 131             if (s->feat & TIMER_FEAT_EXTCLK) {
 132                 break;
 133             }
 134             /* fallthrough */
 135         default:
 136             qemu_log_mask(LOG_GUEST_ERROR,
 137                           "%s: Reserved TPSC value\n", __func__);
 138         }
 139         switch ((value & TIMER_TCR_CKEG) >> 3) {
 140         case 0:
 141             break;
 142         case 1:
 143         case 2:
 144         case 3:
 145             if (s->feat & TIMER_FEAT_EXTCLK) {
 146                 break;
 147             }
 148             /* fallthrough */
 149         default:
 150             qemu_log_mask(LOG_GUEST_ERROR,
 151                           "%s: Reserved CKEG value\n", __func__);
 152         }
 153         switch ((value & TIMER_TCR_ICPE) >> 6) {
 154         case 0:
 155             break;
 156         case 2:
 157         case 3:
 158             if (s->feat & TIMER_FEAT_CAPT) {
 159                 break;
 160             }
 161             /* fallthrough */
 162         default:
 163             qemu_log_mask(LOG_GUEST_ERROR,
 164                           "%s: Reserved ICPE value\n", __func__);
 165         }
 166         if ((value & TIMER_TCR_UNF) == 0) {
 167             s->int_level = 0;
 168         }
 169
 170         value &= ~TIMER_TCR_UNF;
 171
 172         if ((value & TIMER_TCR_ICPF) && (!(s->feat & TIMER_FEAT_CAPT))) {
 173             qemu_log_mask(LOG_GUEST_ERROR,
 174                           "%s: Reserved ICPF value\n", __func__);
 175         }
 176
 177         value &= ~TIMER_TCR_ICPF; /* capture not supported */
 178
 179         if (value & TIMER_TCR_RESERVED) {
 180             qemu_log_mask(LOG_GUEST_ERROR,
 181                           "%s: Reserved TCR bits set\n", __func__);
 182         }
 183         s->tcr = value;
 184         ptimer_set_limit(s->timer, s->tcor, 0);
 185         ptimer_set_freq(s->timer, freq);
 186         if (s->enabled) {
 187             /* Restart the timer if still enabled.  */
 188             ptimer_run(s->timer, 0);
 189         }
 190         ptimer_transaction_commit(s->timer);
 191         break;
 192     case OFFSET_TCPR:
 193         if (s->feat & TIMER_FEAT_CAPT) {
 194             s->tcpr = value;
 195             break;
 196         }
 197         /* fallthrough */
 198     default:
 199         qemu_log_mask(LOG_GUEST_ERROR,
 200                       "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, offset);
 201     }
 202     sh_timer_update(s);
 203 }
 204
 205 static void sh_timer_start_stop(void *opaque, int enable)
 206 {
 207     SHTimerState *s = opaque;
 208
 209     trace_sh_timer_start_stop(enable, s->enabled);
 210     ptimer_transaction_begin(s->timer);
 211     if (s->enabled && !enable) {
 212         ptimer_stop(s->timer);
 213     }
 214     if (!s->enabled && enable) {
 215         ptimer_run(s->timer, 0);
 216     }
 217     ptimer_transaction_commit(s->timer);
 218     s->enabled = !!enable;
 219 }
 220
 221 static void sh_timer_tick(void *opaque)
 222 {
 223     SHTimerState *s = opaque;
 224     s->int_level = s->enabled;
 225     sh_timer_update(s);
 226 }
 227
 228 static void *sh_timer_init(uint32_t freq, int feat, qemu_irq irq)
 229 {
 230     SHTimerState *s;
 231
 232     s = g_malloc0(sizeof(*s));
 233     s->freq = freq;
 234     s->feat = feat;
 235     s->tcor = 0xffffffff;
 236     s->tcnt = 0xffffffff;
 237     s->tcpr = 0xdeadbeef;
 238     s->tcr = 0;
 239     s->enabled = 0;
 240     s->irq = irq;
 241
 242     s->timer = ptimer_init(sh_timer_tick, s, PTIMER_POLICY_LEGACY);
 243
 244     sh_timer_write(s, OFFSET_TCOR >> 2, s->tcor);
 245     sh_timer_write(s, OFFSET_TCNT >> 2, s->tcnt);
 246     sh_timer_write(s, OFFSET_TCPR >> 2, s->tcpr);
 247     sh_timer_write(s, OFFSET_TCR  >> 2, s->tcpr);
 248     /* ??? Save/restore.  */
 249     return s;
 250 }
 251
 252 typedef struct {
 253     MemoryRegion iomem;
 254     MemoryRegion iomem_p4;
 255     MemoryRegion iomem_a7;
 256     void *timer[3];
 257     int level[3];
 258     uint32_t tocr;
 259     uint32_t tstr;
 260     int feat;
 261 } tmu012_state;
 262
 263 static uint64_t tmu012_read(void *opaque, hwaddr offset, unsigned size)
 264 {
 265     tmu012_state *s = opaque;
 266
 267     trace_sh_timer_read(offset);
 268     if (offset >= 0x20) {
 269         if (!(s->feat & TMU012_FEAT_3CHAN)) {
 270             qemu_log_mask(LOG_GUEST_ERROR,
 271                           "%s: Bad channel offset 0x%" HWADDR_PRIx "\n",
 272                           __func__, offset);
 273         }
 274         return sh_timer_read(s->timer[2], offset - 0x20);
 275     }
 276
 277     if (offset >= 0x14) {
 278         return sh_timer_read(s->timer[1], offset - 0x14);
 279     }
 280     if (offset >= 0x08) {
 281         return sh_timer_read(s->timer[0], offset - 0x08);
 282     }
 283     if (offset == 4) {
 284         return s->tstr;
 285     }
 286     if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) {
 287         return s->tocr;
 288     }
 289
 290     qemu_log_mask(LOG_GUEST_ERROR,
 291                   "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, offset);
 292     return 0;
 293 }
 294
 295 static void tmu012_write(void *opaque, hwaddr offset,
 296                         uint64_t value, unsigned size)
 297 {
 298     tmu012_state *s = opaque;
 299
 300     trace_sh_timer_write(offset, value);
 301     if (offset >= 0x20) {
 302         if (!(s->feat & TMU012_FEAT_3CHAN)) {
 303             qemu_log_mask(LOG_GUEST_ERROR,
 304                           "%s: Bad channel offset 0x%" HWADDR_PRIx "\n",
 305                           __func__, offset);
 306         }
 307         sh_timer_write(s->timer[2], offset - 0x20, value);
 308         return;
 309     }
 310
 311     if (offset >= 0x14) {
 312         sh_timer_write(s->timer[1], offset - 0x14, value);
 313         return;
 314     }
 315
 316     if (offset >= 0x08) {
 317         sh_timer_write(s->timer[0], offset - 0x08, value);
 318         return;
 319     }
 320
 321     if (offset == 4) {
 322         sh_timer_start_stop(s->timer[0], value & (1 << 0));
 323         sh_timer_start_stop(s->timer[1], value & (1 << 1));
 324         if (s->feat & TMU012_FEAT_3CHAN) {
 325             sh_timer_start_stop(s->timer[2], value & (1 << 2));
 326         } else {
 327             if (value & (1 << 2)) {
 328                 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad channel\n", __func__);
 329             }
 330         }
 331
 332         s->tstr = value;
 333         return;
 334     }
 335
 336     if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) {
 337         s->tocr = value & (1 << 0);
 338     }
 339 }
 340
 341 static const MemoryRegionOps tmu012_ops = {
 342     .read = tmu012_read,
 343     .write = tmu012_write,
 344     .endianness = DEVICE_NATIVE_ENDIAN,
 345 };
 346
 347 void tmu012_init(MemoryRegion *sysmem, hwaddr base, int feat, uint32_t freq,
 348                  qemu_irq ch0_irq, qemu_irq ch1_irq,
 349                  qemu_irq ch2_irq0, qemu_irq ch2_irq1)
 350 {
 351     tmu012_state *s;
 352     int timer_feat = (feat & TMU012_FEAT_EXTCLK) ? TIMER_FEAT_EXTCLK : 0;
 353
 354     s = g_malloc0(sizeof(*s));
 355     s->feat = feat;
 356     s->timer[0] = sh_timer_init(freq, timer_feat, ch0_irq);
 357     s->timer[1] = sh_timer_init(freq, timer_feat, ch1_irq);
 358     if (feat & TMU012_FEAT_3CHAN) {
 359         s->timer[2] = sh_timer_init(freq, timer_feat | TIMER_FEAT_CAPT,
 360                                     ch2_irq0); /* ch2_irq1 not supported */
 361     }
 362
 363     memory_region_init_io(&s->iomem, NULL, &tmu012_ops, s, "timer", 0x30);
 364
 365     memory_region_init_alias(&s->iomem_p4, NULL, "timer-p4",
 366                              &s->iomem, 0, memory_region_size(&s->iomem));
 367     memory_region_add_subregion(sysmem, P4ADDR(base), &s->iomem_p4);
 368
 369     memory_region_init_alias(&s->iomem_a7, NULL, "timer-a7",
 370                              &s->iomem, 0, memory_region_size(&s->iomem));
 371     memory_region_add_subregion(sysmem, A7ADDR(base), &s->iomem_a7);
 372     /* ??? Save/restore.  */
 373 }