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