hw/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 licenced under the GPL.
   9  */
  10
  11 #include "hw.h"
  12 #include "sh.h"
  13 #include "qemu-timer.h"
  14
  15 //#define DEBUG_TIMER
  16
  17 #define TIMER_TCR_TPSC          (7 << 0)
  18 #define TIMER_TCR_CKEG          (3 << 3)
  19 #define TIMER_TCR_UNIE          (1 << 5)
  20 #define TIMER_TCR_ICPE          (3 << 6)
  21 #define TIMER_TCR_UNF           (1 << 8)
  22 #define TIMER_TCR_ICPF          (1 << 9)
  23 #define TIMER_TCR_RESERVED      (0x3f << 10)
  24
  25 #define TIMER_FEAT_CAPT   (1 << 0)
  26 #define TIMER_FEAT_EXTCLK (1 << 1)
  27
  28 #define OFFSET_TCOR   0
  29 #define OFFSET_TCNT   1
  30 #define OFFSET_TCR    2
  31 #define OFFSET_TCPR   3
  32
  33 typedef struct {
  34     ptimer_state *timer;
  35     uint32_t tcnt;
  36     uint32_t tcor;
  37     uint32_t tcr;
  38     uint32_t tcpr;
  39     int freq;
  40     int int_level;
  41     int old_level;
  42     int feat;
  43     int enabled;
  44     qemu_irq irq;
  45 } sh_timer_state;
  46
  47 /* Check all active timers, and schedule the next timer interrupt. */
  48
  49 static void sh_timer_update(sh_timer_state *s)
  50 {
  51     int new_level = s->int_level && (s->tcr & TIMER_TCR_UNIE);
  52
  53     if (new_level != s->old_level)
  54       qemu_set_irq (s->irq, new_level);
  55
  56     s->old_level = s->int_level;
  57     s->int_level = new_level;
  58 }
  59
  60 static uint32_t sh_timer_read(void *opaque, target_phys_addr_t offset)
  61 {
  62     sh_timer_state *s = (sh_timer_state *)opaque;
  63
  64     switch (offset >> 2) {
  65     case OFFSET_TCOR:
  66         return s->tcor;
  67     case OFFSET_TCNT:
  68         return ptimer_get_count(s->timer);
  69     case OFFSET_TCR:
  70         return s->tcr | (s->int_level ? TIMER_TCR_UNF : 0);
  71     case OFFSET_TCPR:
  72         if (s->feat & TIMER_FEAT_CAPT)
  73             return s->tcpr;
  74     default:
  75         hw_error("sh_timer_read: Bad offset %x\n", (int)offset);
  76         return 0;
  77     }
  78 }
  79
  80 static void sh_timer_write(void *opaque, target_phys_addr_t offset,
  81                             uint32_t value)
  82 {
  83     sh_timer_state *s = (sh_timer_state *)opaque;
  84     int freq;
  85
  86     switch (offset >> 2) {
  87     case OFFSET_TCOR:
  88         s->tcor = value;
  89         ptimer_set_limit(s->timer, s->tcor, 0);
  90         break;
  91     case OFFSET_TCNT:
  92         s->tcnt = value;
  93         ptimer_set_count(s->timer, s->tcnt);
  94         break;
  95     case OFFSET_TCR:
  96         if (s->enabled) {
  97             /* Pause the timer if it is running.  This may cause some
  98                inaccuracy dure to rounding, but avoids a whole lot of other
  99                messyness.  */
 100             ptimer_stop(s->timer);
 101         }
 102         freq = s->freq;
 103         /* ??? Need to recalculate expiry time after changing divisor.  */
 104         switch (value & TIMER_TCR_TPSC) {
 105         case 0: freq >>= 2; break;
 106         case 1: freq >>= 4; break;
 107         case 2: freq >>= 6; break;
 108         case 3: freq >>= 8; break;
 109         case 4: freq >>= 10; break;
 110         case 6:
 111         case 7: if (s->feat & TIMER_FEAT_EXTCLK) break;
 112         default: hw_error("sh_timer_write: Reserved TPSC value\n"); break;
 113         }
 114         switch ((value & TIMER_TCR_CKEG) >> 3) {
 115         case 0: break;
 116         case 1:
 117         case 2:
 118         case 3: if (s->feat & TIMER_FEAT_EXTCLK) break;
 119         default: hw_error("sh_timer_write: Reserved CKEG value\n"); break;
 120         }
 121         switch ((value & TIMER_TCR_ICPE) >> 6) {
 122         case 0: break;
 123         case 2:
 124         case 3: if (s->feat & TIMER_FEAT_CAPT) break;
 125         default: hw_error("sh_timer_write: Reserved ICPE value\n"); break;
 126         }
 127         if ((value & TIMER_TCR_UNF) == 0)
 128             s->int_level = 0;
 129
 130         value &= ~TIMER_TCR_UNF;
 131
 132         if ((value & TIMER_TCR_ICPF) && (!(s->feat & TIMER_FEAT_CAPT)))
 133             hw_error("sh_timer_write: Reserved ICPF value\n");
 134
 135         value &= ~TIMER_TCR_ICPF; /* capture not supported */
 136
 137         if (value & TIMER_TCR_RESERVED)
 138             hw_error("sh_timer_write: Reserved TCR bits set\n");
 139         s->tcr = value;
 140         ptimer_set_limit(s->timer, s->tcor, 0);
 141         ptimer_set_freq(s->timer, freq);
 142         if (s->enabled) {
 143             /* Restart the timer if still enabled.  */
 144             ptimer_run(s->timer, 0);
 145         }
 146         break;
 147     case OFFSET_TCPR:
 148         if (s->feat & TIMER_FEAT_CAPT) {
 149             s->tcpr = value;
 150             break;
 151         }
 152     default:
 153         hw_error("sh_timer_write: Bad offset %x\n", (int)offset);
 154     }
 155     sh_timer_update(s);
 156 }
 157
 158 static void sh_timer_start_stop(void *opaque, int enable)
 159 {
 160     sh_timer_state *s = (sh_timer_state *)opaque;
 161
 162 #ifdef DEBUG_TIMER
 163     printf("sh_timer_start_stop %d (%d)\n", enable, s->enabled);
 164 #endif
 165
 166     if (s->enabled && !enable) {
 167         ptimer_stop(s->timer);
 168     }
 169     if (!s->enabled && enable) {
 170         ptimer_run(s->timer, 0);
 171     }
 172     s->enabled = !!enable;
 173
 174 #ifdef DEBUG_TIMER
 175     printf("sh_timer_start_stop done %d\n", s->enabled);
 176 #endif
 177 }
 178
 179 static void sh_timer_tick(void *opaque)
 180 {
 181     sh_timer_state *s = (sh_timer_state *)opaque;
 182     s->int_level = s->enabled;
 183     sh_timer_update(s);
 184 }
 185
 186 static void *sh_timer_init(uint32_t freq, int feat, qemu_irq irq)
 187 {
 188     sh_timer_state *s;
 189     QEMUBH *bh;
 190
 191     s = (sh_timer_state *)qemu_mallocz(sizeof(sh_timer_state));
 192     s->freq = freq;
 193     s->feat = feat;
 194     s->tcor = 0xffffffff;
 195     s->tcnt = 0xffffffff;
 196     s->tcpr = 0xdeadbeef;
 197     s->tcr = 0;
 198     s->enabled = 0;
 199     s->irq = irq;
 200
 201     bh = qemu_bh_new(sh_timer_tick, s);
 202     s->timer = ptimer_init(bh);
 203
 204     sh_timer_write(s, OFFSET_TCOR >> 2, s->tcor);
 205     sh_timer_write(s, OFFSET_TCNT >> 2, s->tcnt);
 206     sh_timer_write(s, OFFSET_TCPR >> 2, s->tcpr);
 207     sh_timer_write(s, OFFSET_TCR  >> 2, s->tcpr);
 208     /* ??? Save/restore.  */
 209     return s;
 210 }
 211
 212 typedef struct {
 213     void *timer[3];
 214     int level[3];
 215     uint32_t tocr;
 216     uint32_t tstr;
 217     int feat;
 218 } tmu012_state;
 219
 220 static uint32_t tmu012_read(void *opaque, target_phys_addr_t offset)
 221 {
 222     tmu012_state *s = (tmu012_state *)opaque;
 223
 224 #ifdef DEBUG_TIMER
 225     printf("tmu012_read 0x%lx\n", (unsigned long) offset);
 226 #endif
 227
 228     if (offset >= 0x20) {
 229         if (!(s->feat & TMU012_FEAT_3CHAN))
 230             hw_error("tmu012_write: Bad channel offset %x\n", (int)offset);
 231         return sh_timer_read(s->timer[2], offset - 0x20);
 232     }
 233
 234     if (offset >= 0x14)
 235         return sh_timer_read(s->timer[1], offset - 0x14);
 236
 237     if (offset >= 0x08)
 238         return sh_timer_read(s->timer[0], offset - 0x08);
 239
 240     if (offset == 4)
 241         return s->tstr;
 242
 243     if ((s->feat & TMU012_FEAT_TOCR) && offset == 0)
 244         return s->tocr;
 245
 246     hw_error("tmu012_write: Bad offset %x\n", (int)offset);
 247     return 0;
 248 }
 249
 250 static void tmu012_write(void *opaque, target_phys_addr_t offset,
 251                         uint32_t value)
 252 {
 253     tmu012_state *s = (tmu012_state *)opaque;
 254
 255 #ifdef DEBUG_TIMER
 256     printf("tmu012_write 0x%lx 0x%08x\n", (unsigned long) offset, value);
 257 #endif
 258
 259     if (offset >= 0x20) {
 260         if (!(s->feat & TMU012_FEAT_3CHAN))
 261             hw_error("tmu012_write: Bad channel offset %x\n", (int)offset);
 262         sh_timer_write(s->timer[2], offset - 0x20, value);
 263         return;
 264     }
 265
 266     if (offset >= 0x14) {
 267         sh_timer_write(s->timer[1], offset - 0x14, value);
 268         return;
 269     }
 270
 271     if (offset >= 0x08) {
 272         sh_timer_write(s->timer[0], offset - 0x08, value);
 273         return;
 274     }
 275
 276     if (offset == 4) {
 277         sh_timer_start_stop(s->timer[0], value & (1 << 0));
 278         sh_timer_start_stop(s->timer[1], value & (1 << 1));
 279         if (s->feat & TMU012_FEAT_3CHAN)
 280             sh_timer_start_stop(s->timer[2], value & (1 << 2));
 281         else
 282             if (value & (1 << 2))
 283                 hw_error("tmu012_write: Bad channel\n");
 284
 285         s->tstr = value;
 286         return;
 287     }
 288
 289     if ((s->feat & TMU012_FEAT_TOCR) && offset == 0) {
 290         s->tocr = value & (1 << 0);
 291     }
 292 }
 293
 294 static CPUReadMemoryFunc * const tmu012_readfn[] = {
 295     tmu012_read,
 296     tmu012_read,
 297     tmu012_read
 298 };
 299
 300 static CPUWriteMemoryFunc * const tmu012_writefn[] = {
 301     tmu012_write,
 302     tmu012_write,
 303     tmu012_write
 304 };
 305
 306 void tmu012_init(target_phys_addr_t base, int feat, uint32_t freq,
 307                  qemu_irq ch0_irq, qemu_irq ch1_irq,
 308                  qemu_irq ch2_irq0, qemu_irq ch2_irq1)
 309 {
 310     int iomemtype;
 311     tmu012_state *s;
 312     int timer_feat = (feat & TMU012_FEAT_EXTCLK) ? TIMER_FEAT_EXTCLK : 0;
 313
 314     s = (tmu012_state *)qemu_mallocz(sizeof(tmu012_state));
 315     s->feat = feat;
 316     s->timer[0] = sh_timer_init(freq, timer_feat, ch0_irq);
 317     s->timer[1] = sh_timer_init(freq, timer_feat, ch1_irq);
 318     if (feat & TMU012_FEAT_3CHAN)
 319         s->timer[2] = sh_timer_init(freq, timer_feat | TIMER_FEAT_CAPT,
 320                                     ch2_irq0); /* ch2_irq1 not supported */
 321     iomemtype = cpu_register_io_memory(tmu012_readfn,
 322                                        tmu012_writefn, s);
 323     cpu_register_physical_memory(P4ADDR(base), 0x00001000, iomemtype);
 324     cpu_register_physical_memory(A7ADDR(base), 0x00001000, iomemtype);
 325     /* ??? Save/restore.  */
 326 }