hw/etraxfs_dma.c

   1 /*
   2  * QEMU ETRAX DMA Controller.
   3  *
   4  * Copyright (c) 2008 Edgar E. Iglesias, Axis Communications AB.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <stdio.h>
  25 #include <sys/time.h>
  26 #include "hw.h"
  27 #include "exec-memory.h"
  28 #include "qemu-common.h"
  29 #include "sysemu.h"
  30
  31 #include "etraxfs_dma.h"
  32
  33 #define D(x)
  34
  35 #define RW_DATA           (0x0 / 4)
  36 #define RW_SAVED_DATA     (0x58 / 4)
  37 #define RW_SAVED_DATA_BUF (0x5c / 4)
  38 #define RW_GROUP          (0x60 / 4)
  39 #define RW_GROUP_DOWN     (0x7c / 4)
  40 #define RW_CMD            (0x80 / 4)
  41 #define RW_CFG            (0x84 / 4)
  42 #define RW_STAT           (0x88 / 4)
  43 #define RW_INTR_MASK      (0x8c / 4)
  44 #define RW_ACK_INTR       (0x90 / 4)
  45 #define R_INTR            (0x94 / 4)
  46 #define R_MASKED_INTR     (0x98 / 4)
  47 #define RW_STREAM_CMD     (0x9c / 4)
  48
  49 #define DMA_REG_MAX       (0x100 / 4)
  50
  51 /* descriptors */
  52
  53 // ------------------------------------------------------------ dma_descr_group
  54 typedef struct dma_descr_group {
  55   uint32_t                      next;
  56   unsigned                      eol        : 1;
  57   unsigned                      tol        : 1;
  58   unsigned                      bol        : 1;
  59   unsigned                                 : 1;
  60   unsigned                      intr       : 1;
  61   unsigned                                 : 2;
  62   unsigned                      en         : 1;
  63   unsigned                                 : 7;
  64   unsigned                      dis        : 1;
  65   unsigned                      md         : 16;
  66   struct dma_descr_group       *up;
  67   union {
  68     struct dma_descr_context   *context;
  69     struct dma_descr_group     *group;
  70   }                             down;
  71 } dma_descr_group;
  72
  73 // ---------------------------------------------------------- dma_descr_context
  74 typedef struct dma_descr_context {
  75   uint32_t                      next;
  76   unsigned                      eol        : 1;
  77   unsigned                                 : 3;
  78   unsigned                      intr       : 1;
  79   unsigned                                 : 1;
  80   unsigned                      store_mode : 1;
  81   unsigned                      en         : 1;
  82   unsigned                                 : 7;
  83   unsigned                      dis        : 1;
  84   unsigned                      md0        : 16;
  85   unsigned                      md1;
  86   unsigned                      md2;
  87   unsigned                      md3;
  88   unsigned                      md4;
  89   uint32_t                      saved_data;
  90   uint32_t                      saved_data_buf;
  91 } dma_descr_context;
  92
  93 // ------------------------------------------------------------- dma_descr_data
  94 typedef struct dma_descr_data {
  95   uint32_t                      next;
  96   uint32_t                      buf;
  97   unsigned                      eol        : 1;
  98   unsigned                                 : 2;
  99   unsigned                      out_eop    : 1;
 100   unsigned                      intr       : 1;
 101   unsigned                      wait       : 1;
 102   unsigned                                 : 2;
 103   unsigned                                 : 3;
 104   unsigned                      in_eop     : 1;
 105   unsigned                                 : 4;
 106   unsigned                      md         : 16;
 107   uint32_t                      after;
 108 } dma_descr_data;
 109
 110 /* Constants */
 111 enum {
 112   regk_dma_ack_pkt                         = 0x00000100,
 113   regk_dma_anytime                         = 0x00000001,
 114   regk_dma_array                           = 0x00000008,
 115   regk_dma_burst                           = 0x00000020,
 116   regk_dma_client                          = 0x00000002,
 117   regk_dma_copy_next                       = 0x00000010,
 118   regk_dma_copy_up                         = 0x00000020,
 119   regk_dma_data_at_eol                     = 0x00000001,
 120   regk_dma_dis_c                           = 0x00000010,
 121   regk_dma_dis_g                           = 0x00000020,
 122   regk_dma_idle                            = 0x00000001,
 123   regk_dma_intern                          = 0x00000004,
 124   regk_dma_load_c                          = 0x00000200,
 125   regk_dma_load_c_n                        = 0x00000280,
 126   regk_dma_load_c_next                     = 0x00000240,
 127   regk_dma_load_d                          = 0x00000140,
 128   regk_dma_load_g                          = 0x00000300,
 129   regk_dma_load_g_down                     = 0x000003c0,
 130   regk_dma_load_g_next                     = 0x00000340,
 131   regk_dma_load_g_up                       = 0x00000380,
 132   regk_dma_next_en                         = 0x00000010,
 133   regk_dma_next_pkt                        = 0x00000010,
 134   regk_dma_no                              = 0x00000000,
 135   regk_dma_only_at_wait                    = 0x00000000,
 136   regk_dma_restore                         = 0x00000020,
 137   regk_dma_rst                             = 0x00000001,
 138   regk_dma_running                         = 0x00000004,
 139   regk_dma_rw_cfg_default                  = 0x00000000,
 140   regk_dma_rw_cmd_default                  = 0x00000000,
 141   regk_dma_rw_intr_mask_default            = 0x00000000,
 142   regk_dma_rw_stat_default                 = 0x00000101,
 143   regk_dma_rw_stream_cmd_default           = 0x00000000,
 144   regk_dma_save_down                       = 0x00000020,
 145   regk_dma_save_up                         = 0x00000020,
 146   regk_dma_set_reg                         = 0x00000050,
 147   regk_dma_set_w_size1                     = 0x00000190,
 148   regk_dma_set_w_size2                     = 0x000001a0,
 149   regk_dma_set_w_size4                     = 0x000001c0,
 150   regk_dma_stopped                         = 0x00000002,
 151   regk_dma_store_c                         = 0x00000002,
 152   regk_dma_store_descr                     = 0x00000000,
 153   regk_dma_store_g                         = 0x00000004,
 154   regk_dma_store_md                        = 0x00000001,
 155   regk_dma_sw                              = 0x00000008,
 156   regk_dma_update_down                     = 0x00000020,
 157   regk_dma_yes                             = 0x00000001
 158 };
 159
 160 enum dma_ch_state
 161 {
 162         RST = 1,
 163         STOPPED = 2,
 164         RUNNING = 4
 165 };
 166
 167 struct fs_dma_channel
 168 {
 169         qemu_irq irq;
 170         struct etraxfs_dma_client *client;
 171
 172         /* Internal status.  */
 173         int stream_cmd_src;
 174         enum dma_ch_state state;
 175
 176         unsigned int input : 1;
 177         unsigned int eol : 1;
 178
 179         struct dma_descr_group current_g;
 180         struct dma_descr_context current_c;
 181         struct dma_descr_data current_d;
 182
 183         /* Controll registers.  */
 184         uint32_t regs[DMA_REG_MAX];
 185 };
 186
 187 struct fs_dma_ctrl
 188 {
 189         MemoryRegion mmio;
 190         int nr_channels;
 191         struct fs_dma_channel *channels;
 192
 193         QEMUBH *bh;
 194 };
 195
 196 static void DMA_run(void *opaque);
 197 static int channel_out_run(struct fs_dma_ctrl *ctrl, int c);
 198
 199 static inline uint32_t channel_reg(struct fs_dma_ctrl *ctrl, int c, int reg)
 200 {
 201         return ctrl->channels[c].regs[reg];
 202 }
 203
 204 static inline int channel_stopped(struct fs_dma_ctrl *ctrl, int c)
 205 {
 206         return channel_reg(ctrl, c, RW_CFG) & 2;
 207 }
 208
 209 static inline int channel_en(struct fs_dma_ctrl *ctrl, int c)
 210 {
 211         return (channel_reg(ctrl, c, RW_CFG) & 1)
 212                 && ctrl->channels[c].client;
 213 }
 214
 215 static inline int fs_channel(target_phys_addr_t addr)
 216 {
 217         /* Every channel has a 0x2000 ctrl register map.  */
 218         return addr >> 13;
 219 }
 220
 221 #ifdef USE_THIS_DEAD_CODE
 222 static void channel_load_g(struct fs_dma_ctrl *ctrl, int c)
 223 {
 224         target_phys_addr_t addr = channel_reg(ctrl, c, RW_GROUP);
 225
 226         /* Load and decode. FIXME: handle endianness.  */
 227         cpu_physical_memory_read (addr,
 228                                   (void *) &ctrl->channels[c].current_g,
 229                                   sizeof ctrl->channels[c].current_g);
 230 }
 231
 232 static void dump_c(int ch, struct dma_descr_context *c)
 233 {
 234         printf("%s ch=%d\n", __func__, ch);
 235         printf("next=%x\n", c->next);
 236         printf("saved_data=%x\n", c->saved_data);
 237         printf("saved_data_buf=%x\n", c->saved_data_buf);
 238         printf("eol=%x\n", (uint32_t) c->eol);
 239 }
 240
 241 static void dump_d(int ch, struct dma_descr_data *d)
 242 {
 243         printf("%s ch=%d\n", __func__, ch);
 244         printf("next=%x\n", d->next);
 245         printf("buf=%x\n", d->buf);
 246         printf("after=%x\n", d->after);
 247         printf("intr=%x\n", (uint32_t) d->intr);
 248         printf("out_eop=%x\n", (uint32_t) d->out_eop);
 249         printf("in_eop=%x\n", (uint32_t) d->in_eop);
 250         printf("eol=%x\n", (uint32_t) d->eol);
 251 }
 252 #endif
 253
 254 static void channel_load_c(struct fs_dma_ctrl *ctrl, int c)
 255 {
 256         target_phys_addr_t addr = channel_reg(ctrl, c, RW_GROUP_DOWN);
 257
 258         /* Load and decode. FIXME: handle endianness.  */
 259         cpu_physical_memory_read (addr,
 260                                   (void *) &ctrl->channels[c].current_c,
 261                                   sizeof ctrl->channels[c].current_c);
 262
 263         D(dump_c(c, &ctrl->channels[c].current_c));
 264         /* I guess this should update the current pos.  */
 265         ctrl->channels[c].regs[RW_SAVED_DATA] =
 266                 (uint32_t)(unsigned long)ctrl->channels[c].current_c.saved_data;
 267         ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
 268                 (uint32_t)(unsigned long)ctrl->channels[c].current_c.saved_data_buf;
 269 }
 270
 271 static void channel_load_d(struct fs_dma_ctrl *ctrl, int c)
 272 {
 273         target_phys_addr_t addr = channel_reg(ctrl, c, RW_SAVED_DATA);
 274
 275         /* Load and decode. FIXME: handle endianness.  */
 276         D(printf("%s ch=%d addr=" TARGET_FMT_plx "\n", __func__, c, addr));
 277         cpu_physical_memory_read (addr,
 278                                   (void *) &ctrl->channels[c].current_d,
 279                                   sizeof ctrl->channels[c].current_d);
 280
 281         D(dump_d(c, &ctrl->channels[c].current_d));
 282         ctrl->channels[c].regs[RW_DATA] = addr;
 283 }
 284
 285 static void channel_store_c(struct fs_dma_ctrl *ctrl, int c)
 286 {
 287         target_phys_addr_t addr = channel_reg(ctrl, c, RW_GROUP_DOWN);
 288
 289         /* Encode and store. FIXME: handle endianness.  */
 290         D(printf("%s ch=%d addr=" TARGET_FMT_plx "\n", __func__, c, addr));
 291         D(dump_d(c, &ctrl->channels[c].current_d));
 292         cpu_physical_memory_write (addr,
 293                                   (void *) &ctrl->channels[c].current_c,
 294                                   sizeof ctrl->channels[c].current_c);
 295 }
 296
 297 static void channel_store_d(struct fs_dma_ctrl *ctrl, int c)
 298 {
 299         target_phys_addr_t addr = channel_reg(ctrl, c, RW_SAVED_DATA);
 300
 301         /* Encode and store. FIXME: handle endianness.  */
 302         D(printf("%s ch=%d addr=" TARGET_FMT_plx "\n", __func__, c, addr));
 303         cpu_physical_memory_write (addr,
 304                                   (void *) &ctrl->channels[c].current_d,
 305                                   sizeof ctrl->channels[c].current_d);
 306 }
 307
 308 static inline void channel_stop(struct fs_dma_ctrl *ctrl, int c)
 309 {
 310         /* FIXME:  */
 311 }
 312
 313 static inline void channel_start(struct fs_dma_ctrl *ctrl, int c)
 314 {
 315         if (ctrl->channels[c].client)
 316         {
 317                 ctrl->channels[c].eol = 0;
 318                 ctrl->channels[c].state = RUNNING;
 319                 if (!ctrl->channels[c].input)
 320                         channel_out_run(ctrl, c);
 321         } else
 322                 printf("WARNING: starting DMA ch %d with no client\n", c);
 323
 324         qemu_bh_schedule_idle(ctrl->bh);
 325 }
 326
 327 static void channel_continue(struct fs_dma_ctrl *ctrl, int c)
 328 {
 329         if (!channel_en(ctrl, c)
 330             || channel_stopped(ctrl, c)
 331             || ctrl->channels[c].state != RUNNING
 332             /* Only reload the current data descriptor if it has eol set.  */
 333             || !ctrl->channels[c].current_d.eol) {
 334                 D(printf("continue failed ch=%d state=%d stopped=%d en=%d eol=%d\n",
 335                          c, ctrl->channels[c].state,
 336                          channel_stopped(ctrl, c),
 337                          channel_en(ctrl,c),
 338                          ctrl->channels[c].eol));
 339                 D(dump_d(c, &ctrl->channels[c].current_d));
 340                 return;
 341         }
 342
 343         /* Reload the current descriptor.  */
 344         channel_load_d(ctrl, c);
 345
 346         /* If the current descriptor cleared the eol flag and we had already
 347            reached eol state, do the continue.  */
 348         if (!ctrl->channels[c].current_d.eol && ctrl->channels[c].eol) {
 349                 D(printf("continue %d ok %x\n", c,
 350                          ctrl->channels[c].current_d.next));
 351                 ctrl->channels[c].regs[RW_SAVED_DATA] =
 352                         (uint32_t)(unsigned long)ctrl->channels[c].current_d.next;
 353                 channel_load_d(ctrl, c);
 354                 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
 355                         (uint32_t)(unsigned long)ctrl->channels[c].current_d.buf;
 356
 357                 channel_start(ctrl, c);
 358         }
 359         ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
 360                 (uint32_t)(unsigned long)ctrl->channels[c].current_d.buf;
 361 }
 362
 363 static void channel_stream_cmd(struct fs_dma_ctrl *ctrl, int c, uint32_t v)
 364 {
 365         unsigned int cmd = v & ((1 << 10) - 1);
 366
 367         D(printf("%s ch=%d cmd=%x\n",
 368                  __func__, c, cmd));
 369         if (cmd & regk_dma_load_d) {
 370                 channel_load_d(ctrl, c);
 371                 if (cmd & regk_dma_burst)
 372                         channel_start(ctrl, c);
 373         }
 374
 375         if (cmd & regk_dma_load_c) {
 376                 channel_load_c(ctrl, c);
 377         }
 378 }
 379
 380 static void channel_update_irq(struct fs_dma_ctrl *ctrl, int c)
 381 {
 382         D(printf("%s %d\n", __func__, c));
 383         ctrl->channels[c].regs[R_INTR] &=
 384                 ~(ctrl->channels[c].regs[RW_ACK_INTR]);
 385
 386         ctrl->channels[c].regs[R_MASKED_INTR] =
 387                 ctrl->channels[c].regs[R_INTR]
 388                 & ctrl->channels[c].regs[RW_INTR_MASK];
 389
 390         D(printf("%s: chan=%d masked_intr=%x\n", __func__,
 391                  c,
 392                  ctrl->channels[c].regs[R_MASKED_INTR]));
 393
 394         qemu_set_irq(ctrl->channels[c].irq,
 395                      !!ctrl->channels[c].regs[R_MASKED_INTR]);
 396 }
 397
 398 static int channel_out_run(struct fs_dma_ctrl *ctrl, int c)
 399 {
 400         uint32_t len;
 401         uint32_t saved_data_buf;
 402         unsigned char buf[2 * 1024];
 403
 404         if (ctrl->channels[c].eol)
 405                 return 0;
 406
 407         do {
 408                 D(printf("ch=%d buf=%x after=%x\n",
 409                          c,
 410                          (uint32_t)ctrl->channels[c].current_d.buf,
 411                          (uint32_t)ctrl->channels[c].current_d.after));
 412
 413                 channel_load_d(ctrl, c);
 414                 saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
 415                 len = (uint32_t)(unsigned long)
 416                         ctrl->channels[c].current_d.after;
 417                 len -= saved_data_buf;
 418
 419                 if (len > sizeof buf)
 420                         len = sizeof buf;
 421                 cpu_physical_memory_read (saved_data_buf, buf, len);
 422
 423                 D(printf("channel %d pushes %x %u bytes\n", c,
 424                          saved_data_buf, len));
 425
 426                 if (ctrl->channels[c].client->client.push)
 427                         ctrl->channels[c].client->client.push(
 428                                 ctrl->channels[c].client->client.opaque,
 429                                 buf, len);
 430                 else
 431                         printf("WARNING: DMA ch%d dataloss,"
 432                                " no attached client.\n", c);
 433
 434                 saved_data_buf += len;
 435
 436                 if (saved_data_buf == (uint32_t)(unsigned long)
 437                                 ctrl->channels[c].current_d.after) {
 438                         /* Done. Step to next.  */
 439                         if (ctrl->channels[c].current_d.out_eop) {
 440                                 /* TODO: signal eop to the client.  */
 441                                 D(printf("signal eop\n"));
 442                         }
 443                         if (ctrl->channels[c].current_d.intr) {
 444                                 /* TODO: signal eop to the client.  */
 445                                 /* data intr.  */
 446                                 D(printf("signal intr %d eol=%d\n",
 447                                         len, ctrl->channels[c].current_d.eol));
 448                                 ctrl->channels[c].regs[R_INTR] |= (1 << 2);
 449                                 channel_update_irq(ctrl, c);
 450                         }
 451                         channel_store_d(ctrl, c);
 452                         if (ctrl->channels[c].current_d.eol) {
 453                                 D(printf("channel %d EOL\n", c));
 454                                 ctrl->channels[c].eol = 1;
 455
 456                                 /* Mark the context as disabled.  */
 457                                 ctrl->channels[c].current_c.dis = 1;
 458                                 channel_store_c(ctrl, c);
 459
 460                                 channel_stop(ctrl, c);
 461                         } else {
 462                                 ctrl->channels[c].regs[RW_SAVED_DATA] =
 463                                         (uint32_t)(unsigned long)ctrl->
 464                                                 channels[c].current_d.next;
 465                                 /* Load new descriptor.  */
 466                                 channel_load_d(ctrl, c);
 467                                 saved_data_buf = (uint32_t)(unsigned long)
 468                                         ctrl->channels[c].current_d.buf;
 469                         }
 470
 471                         ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
 472                                                         saved_data_buf;
 473                         D(dump_d(c, &ctrl->channels[c].current_d));
 474                 }
 475                 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] = saved_data_buf;
 476         } while (!ctrl->channels[c].eol);
 477         return 1;
 478 }
 479
 480 static int channel_in_process(struct fs_dma_ctrl *ctrl, int c,
 481                               unsigned char *buf, int buflen, int eop)
 482 {
 483         uint32_t len;
 484         uint32_t saved_data_buf;
 485
 486         if (ctrl->channels[c].eol == 1)
 487                 return 0;
 488
 489         channel_load_d(ctrl, c);
 490         saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
 491         len = (uint32_t)(unsigned long)ctrl->channels[c].current_d.after;
 492         len -= saved_data_buf;
 493
 494         if (len > buflen)
 495                 len = buflen;
 496
 497         cpu_physical_memory_write (saved_data_buf, buf, len);
 498         saved_data_buf += len;
 499
 500         if (saved_data_buf ==
 501             (uint32_t)(unsigned long)ctrl->channels[c].current_d.after
 502             || eop) {
 503                 uint32_t r_intr = ctrl->channels[c].regs[R_INTR];
 504
 505                 D(printf("in dscr end len=%d\n",
 506                          ctrl->channels[c].current_d.after
 507                          - ctrl->channels[c].current_d.buf));
 508                 ctrl->channels[c].current_d.after = saved_data_buf;
 509
 510                 /* Done. Step to next.  */
 511                 if (ctrl->channels[c].current_d.intr) {
 512                         /* TODO: signal eop to the client.  */
 513                         /* data intr.  */
 514                         ctrl->channels[c].regs[R_INTR] |= 3;
 515                 }
 516                 if (eop) {
 517                         ctrl->channels[c].current_d.in_eop = 1;
 518                         ctrl->channels[c].regs[R_INTR] |= 8;
 519                 }
 520                 if (r_intr != ctrl->channels[c].regs[R_INTR])
 521                         channel_update_irq(ctrl, c);
 522
 523                 channel_store_d(ctrl, c);
 524                 D(dump_d(c, &ctrl->channels[c].current_d));
 525
 526                 if (ctrl->channels[c].current_d.eol) {
 527                         D(printf("channel %d EOL\n", c));
 528                         ctrl->channels[c].eol = 1;
 529
 530                         /* Mark the context as disabled.  */
 531                         ctrl->channels[c].current_c.dis = 1;
 532                         channel_store_c(ctrl, c);
 533
 534                         channel_stop(ctrl, c);
 535                 } else {
 536                         ctrl->channels[c].regs[RW_SAVED_DATA] =
 537                                 (uint32_t)(unsigned long)ctrl->
 538                                         channels[c].current_d.next;
 539                         /* Load new descriptor.  */
 540                         channel_load_d(ctrl, c);
 541                         saved_data_buf = (uint32_t)(unsigned long)
 542                                 ctrl->channels[c].current_d.buf;
 543                 }
 544         }
 545
 546         ctrl->channels[c].regs[RW_SAVED_DATA_BUF] = saved_data_buf;
 547         return len;
 548 }
 549
 550 static inline int channel_in_run(struct fs_dma_ctrl *ctrl, int c)
 551 {
 552         if (ctrl->channels[c].client->client.pull) {
 553                 ctrl->channels[c].client->client.pull(
 554                         ctrl->channels[c].client->client.opaque);
 555                 return 1;
 556         } else
 557                 return 0;
 558 }
 559
 560 static uint32_t dma_rinvalid (void *opaque, target_phys_addr_t addr)
 561 {
 562         hw_error("Unsupported short raccess. reg=" TARGET_FMT_plx "\n", addr);
 563         return 0;
 564 }
 565
 566 static uint64_t
 567 dma_read(void *opaque, target_phys_addr_t addr, unsigned int size)
 568 {
 569         struct fs_dma_ctrl *ctrl = opaque;
 570         int c;
 571         uint32_t r = 0;
 572
 573         if (size != 4) {
 574                 dma_rinvalid(opaque, addr);
 575         }
 576
 577         /* Make addr relative to this channel and bounded to nr regs.  */
 578         c = fs_channel(addr);
 579         addr &= 0xff;
 580         addr >>= 2;
 581         switch (addr)
 582         {
 583                 case RW_STAT:
 584                         r = ctrl->channels[c].state & 7;
 585                         r |= ctrl->channels[c].eol << 5;
 586                         r |= ctrl->channels[c].stream_cmd_src << 8;
 587                         break;
 588
 589                 default:
 590                         r = ctrl->channels[c].regs[addr];
 591                         D(printf ("%s c=%d addr=" TARGET_FMT_plx "\n",
 592                                   __func__, c, addr));
 593                         break;
 594         }
 595         return r;
 596 }
 597
 598 static void
 599 dma_winvalid (void *opaque, target_phys_addr_t addr, uint32_t value)
 600 {
 601         hw_error("Unsupported short waccess. reg=" TARGET_FMT_plx "\n", addr);
 602 }
 603
 604 static void
 605 dma_update_state(struct fs_dma_ctrl *ctrl, int c)
 606 {
 607         if (ctrl->channels[c].regs[RW_CFG] & 2)
 608                 ctrl->channels[c].state = STOPPED;
 609         if (!(ctrl->channels[c].regs[RW_CFG] & 1))
 610                 ctrl->channels[c].state = RST;
 611 }
 612
 613 static void
 614 dma_write(void *opaque, target_phys_addr_t addr,
 615           uint64_t val64, unsigned int size)
 616 {
 617         struct fs_dma_ctrl *ctrl = opaque;
 618         uint32_t value = val64;
 619         int c;
 620
 621         if (size != 4) {
 622                 dma_winvalid(opaque, addr, value);
 623         }
 624
 625         /* Make addr relative to this channel and bounded to nr regs.  */
 626         c = fs_channel(addr);
 627         addr &= 0xff;
 628         addr >>= 2;
 629         switch (addr)
 630         {
 631                 case RW_DATA:
 632                         ctrl->channels[c].regs[addr] = value;
 633                         break;
 634
 635                 case RW_CFG:
 636                         ctrl->channels[c].regs[addr] = value;
 637                         dma_update_state(ctrl, c);
 638                         break;
 639                 case RW_CMD:
 640                         /* continue.  */
 641                         if (value & ~1)
 642                                 printf("Invalid store to ch=%d RW_CMD %x\n",
 643                                        c, value);
 644                         ctrl->channels[c].regs[addr] = value;
 645                         channel_continue(ctrl, c);
 646                         break;
 647
 648                 case RW_SAVED_DATA:
 649                 case RW_SAVED_DATA_BUF:
 650                 case RW_GROUP:
 651                 case RW_GROUP_DOWN:
 652                         ctrl->channels[c].regs[addr] = value;
 653                         break;
 654
 655                 case RW_ACK_INTR:
 656                 case RW_INTR_MASK:
 657                         ctrl->channels[c].regs[addr] = value;
 658                         channel_update_irq(ctrl, c);
 659                         if (addr == RW_ACK_INTR)
 660                                 ctrl->channels[c].regs[RW_ACK_INTR] = 0;
 661                         break;
 662
 663                 case RW_STREAM_CMD:
 664                         if (value & ~1023)
 665                                 printf("Invalid store to ch=%d "
 666                                        "RW_STREAMCMD %x\n",
 667                                        c, value);
 668                         ctrl->channels[c].regs[addr] = value;
 669                         D(printf("stream_cmd ch=%d\n", c));
 670                         channel_stream_cmd(ctrl, c, value);
 671                         break;
 672
 673                 default:
 674                         D(printf ("%s c=%d " TARGET_FMT_plx "\n",
 675                                 __func__, c, addr));
 676                         break;
 677         }
 678 }
 679
 680 static const MemoryRegionOps dma_ops = {
 681         .read = dma_read,
 682         .write = dma_write,
 683         .endianness = DEVICE_NATIVE_ENDIAN,
 684         .valid = {
 685                 .min_access_size = 1,
 686                 .max_access_size = 4
 687         }
 688 };
 689
 690 static int etraxfs_dmac_run(void *opaque)
 691 {
 692         struct fs_dma_ctrl *ctrl = opaque;
 693         int i;
 694         int p = 0;
 695
 696         for (i = 0;
 697              i < ctrl->nr_channels;
 698              i++)
 699         {
 700                 if (ctrl->channels[i].state == RUNNING)
 701                 {
 702                         if (ctrl->channels[i].input) {
 703                                 p += channel_in_run(ctrl, i);
 704                         } else {
 705                                 p += channel_out_run(ctrl, i);
 706                         }
 707                 }
 708         }
 709         return p;
 710 }
 711
 712 int etraxfs_dmac_input(struct etraxfs_dma_client *client,
 713                        void *buf, int len, int eop)
 714 {
 715         return channel_in_process(client->ctrl, client->channel,
 716                                   buf, len, eop);
 717 }
 718
 719 /* Connect an IRQ line with a channel.  */
 720 void etraxfs_dmac_connect(void *opaque, int c, qemu_irq *line, int input)
 721 {
 722         struct fs_dma_ctrl *ctrl = opaque;
 723         ctrl->channels[c].irq = *line;
 724         ctrl->channels[c].input = input;
 725 }
 726
 727 void etraxfs_dmac_connect_client(void *opaque, int c,
 728                                  struct etraxfs_dma_client *cl)
 729 {
 730         struct fs_dma_ctrl *ctrl = opaque;
 731         cl->ctrl = ctrl;
 732         cl->channel = c;
 733         ctrl->channels[c].client = cl;
 734 }
 735
 736
 737 static void DMA_run(void *opaque)
 738 {
 739     struct fs_dma_ctrl *etraxfs_dmac = opaque;
 740     int p = 1;
 741
 742     if (runstate_is_running())
 743         p = etraxfs_dmac_run(etraxfs_dmac);
 744
 745     if (p)
 746         qemu_bh_schedule_idle(etraxfs_dmac->bh);
 747 }
 748
 749 void *etraxfs_dmac_init(target_phys_addr_t base, int nr_channels)
 750 {
 751         struct fs_dma_ctrl *ctrl = NULL;
 752
 753         ctrl = g_malloc0(sizeof *ctrl);
 754
 755         ctrl->bh = qemu_bh_new(DMA_run, ctrl);
 756
 757         ctrl->nr_channels = nr_channels;
 758         ctrl->channels = g_malloc0(sizeof ctrl->channels[0] * nr_channels);
 759
 760         memory_region_init_io(&ctrl->mmio, &dma_ops, ctrl, "etraxfs-dma",
 761                               nr_channels * 0x2000);
 762         memory_region_add_subregion(get_system_memory(), base, &ctrl->mmio);
 763
 764         return ctrl;
 765 }