hw/pl080.c

   1 /*
   2  * Arm PrimeCell PL080/PL081 DMA controller
   3  *
   4  * Copyright (c) 2006 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licensed under the GPL.
   8  */
   9
  10 #include "sysbus.h"
  11
  12 #define PL080_MAX_CHANNELS 8
  13 #define PL080_CONF_E    0x1
  14 #define PL080_CONF_M1   0x2
  15 #define PL080_CONF_M2   0x4
  16
  17 #define PL080_CCONF_H   0x40000
  18 #define PL080_CCONF_A   0x20000
  19 #define PL080_CCONF_L   0x10000
  20 #define PL080_CCONF_ITC 0x08000
  21 #define PL080_CCONF_IE  0x04000
  22 #define PL080_CCONF_E   0x00001
  23
  24 #define PL080_CCTRL_I   0x80000000
  25 #define PL080_CCTRL_DI  0x08000000
  26 #define PL080_CCTRL_SI  0x04000000
  27 #define PL080_CCTRL_D   0x02000000
  28 #define PL080_CCTRL_S   0x01000000
  29
  30 typedef struct {
  31     uint32_t src;
  32     uint32_t dest;
  33     uint32_t lli;
  34     uint32_t ctrl;
  35     uint32_t conf;
  36 } pl080_channel;
  37
  38 typedef struct {
  39     SysBusDevice busdev;
  40     MemoryRegion iomem;
  41     uint8_t tc_int;
  42     uint8_t tc_mask;
  43     uint8_t err_int;
  44     uint8_t err_mask;
  45     uint32_t conf;
  46     uint32_t sync;
  47     uint32_t req_single;
  48     uint32_t req_burst;
  49     pl080_channel chan[PL080_MAX_CHANNELS];
  50     int nchannels;
  51     /* Flag to avoid recursive DMA invocations.  */
  52     int running;
  53     qemu_irq irq;
  54 } pl080_state;
  55
  56 static const VMStateDescription vmstate_pl080_channel = {
  57     .name = "pl080_channel",
  58     .version_id = 1,
  59     .minimum_version_id = 1,
  60     .fields = (VMStateField[]) {
  61         VMSTATE_UINT32(src, pl080_channel),
  62         VMSTATE_UINT32(dest, pl080_channel),
  63         VMSTATE_UINT32(lli, pl080_channel),
  64         VMSTATE_UINT32(ctrl, pl080_channel),
  65         VMSTATE_UINT32(conf, pl080_channel),
  66         VMSTATE_END_OF_LIST()
  67     }
  68 };
  69
  70 static const VMStateDescription vmstate_pl080 = {
  71     .name = "pl080",
  72     .version_id = 1,
  73     .minimum_version_id = 1,
  74     .fields = (VMStateField[]) {
  75         VMSTATE_UINT8(tc_int, pl080_state),
  76         VMSTATE_UINT8(tc_mask, pl080_state),
  77         VMSTATE_UINT8(err_int, pl080_state),
  78         VMSTATE_UINT8(err_mask, pl080_state),
  79         VMSTATE_UINT32(conf, pl080_state),
  80         VMSTATE_UINT32(sync, pl080_state),
  81         VMSTATE_UINT32(req_single, pl080_state),
  82         VMSTATE_UINT32(req_burst, pl080_state),
  83         VMSTATE_UINT8(tc_int, pl080_state),
  84         VMSTATE_UINT8(tc_int, pl080_state),
  85         VMSTATE_UINT8(tc_int, pl080_state),
  86         VMSTATE_STRUCT_ARRAY(chan, pl080_state, PL080_MAX_CHANNELS,
  87                              1, vmstate_pl080_channel, pl080_channel),
  88         VMSTATE_INT32(running, pl080_state),
  89         VMSTATE_END_OF_LIST()
  90     }
  91 };
  92
  93 static const unsigned char pl080_id[] =
  94 { 0x80, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 };
  95
  96 static const unsigned char pl081_id[] =
  97 { 0x81, 0x10, 0x04, 0x0a, 0x0d, 0xf0, 0x05, 0xb1 };
  98
  99 static void pl080_update(pl080_state *s)
 100 {
 101     if ((s->tc_int & s->tc_mask)
 102             || (s->err_int & s->err_mask))
 103         qemu_irq_raise(s->irq);
 104     else
 105         qemu_irq_lower(s->irq);
 106 }
 107
 108 static void pl080_run(pl080_state *s)
 109 {
 110     int c;
 111     int flow;
 112     pl080_channel *ch;
 113     int swidth;
 114     int dwidth;
 115     int xsize;
 116     int n;
 117     int src_id;
 118     int dest_id;
 119     int size;
 120     uint8_t buff[4];
 121     uint32_t req;
 122
 123     s->tc_mask = 0;
 124     for (c = 0; c < s->nchannels; c++) {
 125         if (s->chan[c].conf & PL080_CCONF_ITC)
 126             s->tc_mask |= 1 << c;
 127         if (s->chan[c].conf & PL080_CCONF_IE)
 128             s->err_mask |= 1 << c;
 129     }
 130
 131     if ((s->conf & PL080_CONF_E) == 0)
 132         return;
 133
 134 hw_error("DMA active\n");
 135     /* If we are already in the middle of a DMA operation then indicate that
 136        there may be new DMA requests and return immediately.  */
 137     if (s->running) {
 138         s->running++;
 139         return;
 140     }
 141     s->running = 1;
 142     while (s->running) {
 143         for (c = 0; c < s->nchannels; c++) {
 144             ch = &s->chan[c];
 145 again:
 146             /* Test if thiws channel has any pending DMA requests.  */
 147             if ((ch->conf & (PL080_CCONF_H | PL080_CCONF_E))
 148                     != PL080_CCONF_E)
 149                 continue;
 150             flow = (ch->conf >> 11) & 7;
 151             if (flow >= 4) {
 152                 hw_error(
 153                     "pl080_run: Peripheral flow control not implemented\n");
 154             }
 155             src_id = (ch->conf >> 1) & 0x1f;
 156             dest_id = (ch->conf >> 6) & 0x1f;
 157             size = ch->ctrl & 0xfff;
 158             req = s->req_single | s->req_burst;
 159             switch (flow) {
 160             case 0:
 161                 break;
 162             case 1:
 163                 if ((req & (1u << dest_id)) == 0)
 164                     size = 0;
 165                 break;
 166             case 2:
 167                 if ((req & (1u << src_id)) == 0)
 168                     size = 0;
 169                 break;
 170             case 3:
 171                 if ((req & (1u << src_id)) == 0
 172                         || (req & (1u << dest_id)) == 0)
 173                     size = 0;
 174                 break;
 175             }
 176             if (!size)
 177                 continue;
 178
 179             /* Transfer one element.  */
 180             /* ??? Should transfer multiple elements for a burst request.  */
 181             /* ??? Unclear what the proper behavior is when source and
 182                destination widths are different.  */
 183             swidth = 1 << ((ch->ctrl >> 18) & 7);
 184             dwidth = 1 << ((ch->ctrl >> 21) & 7);
 185             for (n = 0; n < dwidth; n+= swidth) {
 186                 cpu_physical_memory_read(ch->src, buff + n, swidth);
 187                 if (ch->ctrl & PL080_CCTRL_SI)
 188                     ch->src += swidth;
 189             }
 190             xsize = (dwidth < swidth) ? swidth : dwidth;
 191             /* ??? This may pad the value incorrectly for dwidth < 32.  */
 192             for (n = 0; n < xsize; n += dwidth) {
 193                 cpu_physical_memory_write(ch->dest + n, buff + n, dwidth);
 194                 if (ch->ctrl & PL080_CCTRL_DI)
 195                     ch->dest += swidth;
 196             }
 197
 198             size--;
 199             ch->ctrl = (ch->ctrl & 0xfffff000) | size;
 200             if (size == 0) {
 201                 /* Transfer complete.  */
 202                 if (ch->lli) {
 203                     ch->src = ldl_le_phys(ch->lli);
 204                     ch->dest = ldl_le_phys(ch->lli + 4);
 205                     ch->ctrl = ldl_le_phys(ch->lli + 12);
 206                     ch->lli = ldl_le_phys(ch->lli + 8);
 207                 } else {
 208                     ch->conf &= ~PL080_CCONF_E;
 209                 }
 210                 if (ch->ctrl & PL080_CCTRL_I) {
 211                     s->tc_int |= 1 << c;
 212                 }
 213             }
 214             goto again;
 215         }
 216         if (--s->running)
 217             s->running = 1;
 218     }
 219 }
 220
 221 static uint64_t pl080_read(void *opaque, target_phys_addr_t offset,
 222                            unsigned size)
 223 {
 224     pl080_state *s = (pl080_state *)opaque;
 225     uint32_t i;
 226     uint32_t mask;
 227
 228     if (offset >= 0xfe0 && offset < 0x1000) {
 229         if (s->nchannels == 8) {
 230             return pl080_id[(offset - 0xfe0) >> 2];
 231         } else {
 232             return pl081_id[(offset - 0xfe0) >> 2];
 233         }
 234     }
 235     if (offset >= 0x100 && offset < 0x200) {
 236         i = (offset & 0xe0) >> 5;
 237         if (i >= s->nchannels)
 238             goto bad_offset;
 239         switch (offset >> 2) {
 240         case 0: /* SrcAddr */
 241             return s->chan[i].src;
 242         case 1: /* DestAddr */
 243             return s->chan[i].dest;
 244         case 2: /* LLI */
 245             return s->chan[i].lli;
 246         case 3: /* Control */
 247             return s->chan[i].ctrl;
 248         case 4: /* Configuration */
 249             return s->chan[i].conf;
 250         default:
 251             goto bad_offset;
 252         }
 253     }
 254     switch (offset >> 2) {
 255     case 0: /* IntStatus */
 256         return (s->tc_int & s->tc_mask) | (s->err_int & s->err_mask);
 257     case 1: /* IntTCStatus */
 258         return (s->tc_int & s->tc_mask);
 259     case 3: /* IntErrorStatus */
 260         return (s->err_int & s->err_mask);
 261     case 5: /* RawIntTCStatus */
 262         return s->tc_int;
 263     case 6: /* RawIntErrorStatus */
 264         return s->err_int;
 265     case 7: /* EnbldChns */
 266         mask = 0;
 267         for (i = 0; i < s->nchannels; i++) {
 268             if (s->chan[i].conf & PL080_CCONF_E)
 269                 mask |= 1 << i;
 270         }
 271         return mask;
 272     case 8: /* SoftBReq */
 273     case 9: /* SoftSReq */
 274     case 10: /* SoftLBReq */
 275     case 11: /* SoftLSReq */
 276         /* ??? Implement these. */
 277         return 0;
 278     case 12: /* Configuration */
 279         return s->conf;
 280     case 13: /* Sync */
 281         return s->sync;
 282     default:
 283     bad_offset:
 284         hw_error("pl080_read: Bad offset %x\n", (int)offset);
 285         return 0;
 286     }
 287 }
 288
 289 static void pl080_write(void *opaque, target_phys_addr_t offset,
 290                         uint64_t value, unsigned size)
 291 {
 292     pl080_state *s = (pl080_state *)opaque;
 293     int i;
 294
 295     if (offset >= 0x100 && offset < 0x200) {
 296         i = (offset & 0xe0) >> 5;
 297         if (i >= s->nchannels)
 298             goto bad_offset;
 299         switch (offset >> 2) {
 300         case 0: /* SrcAddr */
 301             s->chan[i].src = value;
 302             break;
 303         case 1: /* DestAddr */
 304             s->chan[i].dest = value;
 305             break;
 306         case 2: /* LLI */
 307             s->chan[i].lli = value;
 308             break;
 309         case 3: /* Control */
 310             s->chan[i].ctrl = value;
 311             break;
 312         case 4: /* Configuration */
 313             s->chan[i].conf = value;
 314             pl080_run(s);
 315             break;
 316         }
 317     }
 318     switch (offset >> 2) {
 319     case 2: /* IntTCClear */
 320         s->tc_int &= ~value;
 321         break;
 322     case 4: /* IntErrorClear */
 323         s->err_int &= ~value;
 324         break;
 325     case 8: /* SoftBReq */
 326     case 9: /* SoftSReq */
 327     case 10: /* SoftLBReq */
 328     case 11: /* SoftLSReq */
 329         /* ??? Implement these.  */
 330         hw_error("pl080_write: Soft DMA not implemented\n");
 331         break;
 332     case 12: /* Configuration */
 333         s->conf = value;
 334         if (s->conf & (PL080_CONF_M1 | PL080_CONF_M1)) {
 335             hw_error("pl080_write: Big-endian DMA not implemented\n");
 336         }
 337         pl080_run(s);
 338         break;
 339     case 13: /* Sync */
 340         s->sync = value;
 341         break;
 342     default:
 343     bad_offset:
 344         hw_error("pl080_write: Bad offset %x\n", (int)offset);
 345     }
 346     pl080_update(s);
 347 }
 348
 349 static const MemoryRegionOps pl080_ops = {
 350     .read = pl080_read,
 351     .write = pl080_write,
 352     .endianness = DEVICE_NATIVE_ENDIAN,
 353 };
 354
 355 static int pl08x_init(SysBusDevice *dev, int nchannels)
 356 {
 357     pl080_state *s = FROM_SYSBUS(pl080_state, dev);
 358
 359     memory_region_init_io(&s->iomem, &pl080_ops, s, "pl080", 0x1000);
 360     sysbus_init_mmio(dev, &s->iomem);
 361     sysbus_init_irq(dev, &s->irq);
 362     s->nchannels = nchannels;
 363     return 0;
 364 }
 365
 366 static int pl080_init(SysBusDevice *dev)
 367 {
 368     return pl08x_init(dev, 8);
 369 }
 370
 371 static int pl081_init(SysBusDevice *dev)
 372 {
 373     return pl08x_init(dev, 2);
 374 }
 375
 376 static SysBusDeviceInfo pl080_info = {
 377     .init = pl080_init,
 378     .qdev.name = "pl080",
 379     .qdev.size = sizeof(pl080_state),
 380     .qdev.vmsd = &vmstate_pl080,
 381     .qdev.no_user = 1,
 382 };
 383
 384 static SysBusDeviceInfo pl081_info = {
 385     .init = pl081_init,
 386     .qdev.name = "pl081",
 387     .qdev.size = sizeof(pl080_state),
 388     .qdev.vmsd = &vmstate_pl080,
 389     .qdev.no_user = 1,
 390 };
 391
 392 /* The PL080 and PL081 are the same except for the number of channels
 393    they implement (8 and 2 respectively).  */
 394 static void pl080_register_devices(void)
 395 {
 396     sysbus_register_withprop(&pl080_info);
 397     sysbus_register_withprop(&pl081_info);
 398 }
 399
 400 device_init(pl080_register_devices)