qemu/hw/dma/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/hw.h"
  27 #include "exec/address-spaces.h"
  28 #include "qemu-common.h"
  29 #include "sysemu/sysemu.h"
  30
  31 #include "hw/cris/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         /* Control 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(hwaddr 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         hwaddr 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         hwaddr 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         hwaddr 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         hwaddr 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         hwaddr 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         struct dma_context_metadata meta;
 405         bool send_context = true;
 406
 407         if (ctrl->channels[c].eol)
 408                 return 0;
 409
 410         do {
 411                 bool out_eop;
 412                 D(printf("ch=%d buf=%x after=%x\n",
 413                          c,
 414                          (uint32_t)ctrl->channels[c].current_d.buf,
 415                          (uint32_t)ctrl->channels[c].current_d.after));
 416
 417                 if (send_context) {
 418                         if (ctrl->channels[c].client->client.metadata_push) {
 419                                 meta.metadata = ctrl->channels[c].current_d.md;
 420                                 ctrl->channels[c].client->client.metadata_push(
 421                                         ctrl->channels[c].client->client.opaque,
 422                                         &meta);
 423                         }
 424                         send_context = false;
 425                 }
 426
 427                 channel_load_d(ctrl, c);
 428                 saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
 429                 len = (uint32_t)(unsigned long)
 430                         ctrl->channels[c].current_d.after;
 431                 len -= saved_data_buf;
 432
 433                 if (len > sizeof buf)
 434                         len = sizeof buf;
 435                 cpu_physical_memory_read (saved_data_buf, buf, len);
 436
 437                 out_eop = ((saved_data_buf + len) ==
 438                            ctrl->channels[c].current_d.after) &&
 439                         ctrl->channels[c].current_d.out_eop;
 440
 441                 D(printf("channel %d pushes %x %u bytes eop=%u\n", c,
 442                          saved_data_buf, len, out_eop));
 443
 444                 if (ctrl->channels[c].client->client.push)
 445                         ctrl->channels[c].client->client.push(
 446                                 ctrl->channels[c].client->client.opaque,
 447                                 buf, len, out_eop);
 448                 else
 449                         printf("WARNING: DMA ch%d dataloss,"
 450                                " no attached client.\n", c);
 451
 452                 saved_data_buf += len;
 453
 454                 if (saved_data_buf == (uint32_t)(unsigned long)
 455                                 ctrl->channels[c].current_d.after) {
 456                         /* Done. Step to next.  */
 457                         if (ctrl->channels[c].current_d.out_eop) {
 458                                 send_context = true;
 459                         }
 460                         if (ctrl->channels[c].current_d.intr) {
 461                                 /* data intr.  */
 462                                 D(printf("signal intr %d eol=%d\n",
 463                                         len, ctrl->channels[c].current_d.eol));
 464                                 ctrl->channels[c].regs[R_INTR] |= (1 << 2);
 465                                 channel_update_irq(ctrl, c);
 466                         }
 467                         channel_store_d(ctrl, c);
 468                         if (ctrl->channels[c].current_d.eol) {
 469                                 D(printf("channel %d EOL\n", c));
 470                                 ctrl->channels[c].eol = 1;
 471
 472                                 /* Mark the context as disabled.  */
 473                                 ctrl->channels[c].current_c.dis = 1;
 474                                 channel_store_c(ctrl, c);
 475
 476                                 channel_stop(ctrl, c);
 477                         } else {
 478                                 ctrl->channels[c].regs[RW_SAVED_DATA] =
 479                                         (uint32_t)(unsigned long)ctrl->
 480                                                 channels[c].current_d.next;
 481                                 /* Load new descriptor.  */
 482                                 channel_load_d(ctrl, c);
 483                                 saved_data_buf = (uint32_t)(unsigned long)
 484                                         ctrl->channels[c].current_d.buf;
 485                         }
 486
 487                         ctrl->channels[c].regs[RW_SAVED_DATA_BUF] =
 488                                                         saved_data_buf;
 489                         D(dump_d(c, &ctrl->channels[c].current_d));
 490                 }
 491                 ctrl->channels[c].regs[RW_SAVED_DATA_BUF] = saved_data_buf;
 492         } while (!ctrl->channels[c].eol);
 493         return 1;
 494 }
 495
 496 static int channel_in_process(struct fs_dma_ctrl *ctrl, int c,
 497                               unsigned char *buf, int buflen, int eop)
 498 {
 499         uint32_t len;
 500         uint32_t saved_data_buf;
 501
 502         if (ctrl->channels[c].eol == 1)
 503                 return 0;
 504
 505         channel_load_d(ctrl, c);
 506         saved_data_buf = channel_reg(ctrl, c, RW_SAVED_DATA_BUF);
 507         len = (uint32_t)(unsigned long)ctrl->channels[c].current_d.after;
 508         len -= saved_data_buf;
 509
 510         if (len > buflen)
 511                 len = buflen;
 512
 513         cpu_physical_memory_write (saved_data_buf, buf, len);
 514         saved_data_buf += len;
 515
 516         if (saved_data_buf ==
 517             (uint32_t)(unsigned long)ctrl->channels[c].current_d.after
 518             || eop) {
 519                 uint32_t r_intr = ctrl->channels[c].regs[R_INTR];
 520
 521                 D(printf("in dscr end len=%d\n",
 522                          ctrl->channels[c].current_d.after
 523                          - ctrl->channels[c].current_d.buf));
 524                 ctrl->channels[c].current_d.after = saved_data_buf;
 525
 526                 /* Done. Step to next.  */
 527                 if (ctrl->channels[c].current_d.intr) {
 528                         /* TODO: signal eop to the client.  */
 529                         /* data intr.  */
 530                         ctrl->channels[c].regs[R_INTR] |= 3;
 531                 }
 532                 if (eop) {
 533                         ctrl->channels[c].current_d.in_eop = 1;
 534                         ctrl->channels[c].regs[R_INTR] |= 8;
 535                 }
 536                 if (r_intr != ctrl->channels[c].regs[R_INTR])
 537                         channel_update_irq(ctrl, c);
 538
 539                 channel_store_d(ctrl, c);
 540                 D(dump_d(c, &ctrl->channels[c].current_d));
 541
 542                 if (ctrl->channels[c].current_d.eol) {
 543                         D(printf("channel %d EOL\n", c));
 544                         ctrl->channels[c].eol = 1;
 545
 546                         /* Mark the context as disabled.  */
 547                         ctrl->channels[c].current_c.dis = 1;
 548                         channel_store_c(ctrl, c);
 549
 550                         channel_stop(ctrl, c);
 551                 } else {
 552                         ctrl->channels[c].regs[RW_SAVED_DATA] =
 553                                 (uint32_t)(unsigned long)ctrl->
 554                                         channels[c].current_d.next;
 555                         /* Load new descriptor.  */
 556                         channel_load_d(ctrl, c);
 557                         saved_data_buf = (uint32_t)(unsigned long)
 558                                 ctrl->channels[c].current_d.buf;
 559                 }
 560         }
 561
 562         ctrl->channels[c].regs[RW_SAVED_DATA_BUF] = saved_data_buf;
 563         return len;
 564 }
 565
 566 static inline int channel_in_run(struct fs_dma_ctrl *ctrl, int c)
 567 {
 568         if (ctrl->channels[c].client->client.pull) {
 569                 ctrl->channels[c].client->client.pull(
 570                         ctrl->channels[c].client->client.opaque);
 571                 return 1;
 572         } else
 573                 return 0;
 574 }
 575
 576 static uint32_t dma_rinvalid (void *opaque, hwaddr addr)
 577 {
 578         hw_error("Unsupported short raccess. reg=" TARGET_FMT_plx "\n", addr);
 579         return 0;
 580 }
 581
 582 static uint64_t
 583 dma_read(void *opaque, hwaddr addr, unsigned int size)
 584 {
 585         struct fs_dma_ctrl *ctrl = opaque;
 586         int c;
 587         uint32_t r = 0;
 588
 589         if (size != 4) {
 590                 dma_rinvalid(opaque, addr);
 591         }
 592
 593         /* Make addr relative to this channel and bounded to nr regs.  */
 594         c = fs_channel(addr);
 595         addr &= 0xff;
 596         addr >>= 2;
 597         switch (addr)
 598         {
 599                 case RW_STAT:
 600                         r = ctrl->channels[c].state & 7;
 601                         r |= ctrl->channels[c].eol << 5;
 602                         r |= ctrl->channels[c].stream_cmd_src << 8;
 603                         break;
 604
 605                 default:
 606                         r = ctrl->channels[c].regs[addr];
 607                         D(printf ("%s c=%d addr=" TARGET_FMT_plx "\n",
 608                                   __func__, c, addr));
 609                         break;
 610         }
 611         return r;
 612 }
 613
 614 static void
 615 dma_winvalid (void *opaque, hwaddr addr, uint32_t value)
 616 {
 617         hw_error("Unsupported short waccess. reg=" TARGET_FMT_plx "\n", addr);
 618 }
 619
 620 static void
 621 dma_update_state(struct fs_dma_ctrl *ctrl, int c)
 622 {
 623         if (ctrl->channels[c].regs[RW_CFG] & 2)
 624                 ctrl->channels[c].state = STOPPED;
 625         if (!(ctrl->channels[c].regs[RW_CFG] & 1))
 626                 ctrl->channels[c].state = RST;
 627 }
 628
 629 static void
 630 dma_write(void *opaque, hwaddr addr,
 631           uint64_t val64, unsigned int size)
 632 {
 633         struct fs_dma_ctrl *ctrl = opaque;
 634         uint32_t value = val64;
 635         int c;
 636
 637         if (size != 4) {
 638                 dma_winvalid(opaque, addr, value);
 639         }
 640
 641         /* Make addr relative to this channel and bounded to nr regs.  */
 642         c = fs_channel(addr);
 643         addr &= 0xff;
 644         addr >>= 2;
 645         switch (addr)
 646         {
 647                 case RW_DATA:
 648                         ctrl->channels[c].regs[addr] = value;
 649                         break;
 650
 651                 case RW_CFG:
 652                         ctrl->channels[c].regs[addr] = value;
 653                         dma_update_state(ctrl, c);
 654                         break;
 655                 case RW_CMD:
 656                         /* continue.  */
 657                         if (value & ~1)
 658                                 printf("Invalid store to ch=%d RW_CMD %x\n",
 659                                        c, value);
 660                         ctrl->channels[c].regs[addr] = value;
 661                         channel_continue(ctrl, c);
 662                         break;
 663
 664                 case RW_SAVED_DATA:
 665                 case RW_SAVED_DATA_BUF:
 666                 case RW_GROUP:
 667                 case RW_GROUP_DOWN:
 668                         ctrl->channels[c].regs[addr] = value;
 669                         break;
 670
 671                 case RW_ACK_INTR:
 672                 case RW_INTR_MASK:
 673                         ctrl->channels[c].regs[addr] = value;
 674                         channel_update_irq(ctrl, c);
 675                         if (addr == RW_ACK_INTR)
 676                                 ctrl->channels[c].regs[RW_ACK_INTR] = 0;
 677                         break;
 678
 679                 case RW_STREAM_CMD:
 680                         if (value & ~1023)
 681                                 printf("Invalid store to ch=%d "
 682                                        "RW_STREAMCMD %x\n",
 683                                        c, value);
 684                         ctrl->channels[c].regs[addr] = value;
 685                         D(printf("stream_cmd ch=%d\n", c));
 686                         channel_stream_cmd(ctrl, c, value);
 687                         break;
 688
 689                 default:
 690                         D(printf ("%s c=%d " TARGET_FMT_plx "\n",
 691                                 __func__, c, addr));
 692                         break;
 693         }
 694 }
 695
 696 static const MemoryRegionOps dma_ops = {
 697         .read = dma_read,
 698         .write = dma_write,
 699         .endianness = DEVICE_NATIVE_ENDIAN,
 700         .valid = {
 701                 .min_access_size = 1,
 702                 .max_access_size = 4
 703         }
 704 };
 705
 706 static int etraxfs_dmac_run(void *opaque)
 707 {
 708         struct fs_dma_ctrl *ctrl = opaque;
 709         int i;
 710         int p = 0;
 711
 712         for (i = 0;
 713              i < ctrl->nr_channels;
 714              i++)
 715         {
 716                 if (ctrl->channels[i].state == RUNNING)
 717                 {
 718                         if (ctrl->channels[i].input) {
 719                                 p += channel_in_run(ctrl, i);
 720                         } else {
 721                                 p += channel_out_run(ctrl, i);
 722                         }
 723                 }
 724         }
 725         return p;
 726 }
 727
 728 int etraxfs_dmac_input(struct etraxfs_dma_client *client,
 729                        void *buf, int len, int eop)
 730 {
 731         return channel_in_process(client->ctrl, client->channel,
 732                                   buf, len, eop);
 733 }
 734
 735 /* Connect an IRQ line with a channel.  */
 736 void etraxfs_dmac_connect(void *opaque, int c, qemu_irq *line, int input)
 737 {
 738         struct fs_dma_ctrl *ctrl = opaque;
 739         ctrl->channels[c].irq = *line;
 740         ctrl->channels[c].input = input;
 741 }
 742
 743 void etraxfs_dmac_connect_client(void *opaque, int c,
 744                                  struct etraxfs_dma_client *cl)
 745 {
 746         struct fs_dma_ctrl *ctrl = opaque;
 747         cl->ctrl = ctrl;
 748         cl->channel = c;
 749         ctrl->channels[c].client = cl;
 750 }
 751
 752
 753 static void DMA_run(void *opaque)
 754 {
 755     struct fs_dma_ctrl *etraxfs_dmac = opaque;
 756     int p = 1;
 757
 758     if (runstate_is_running())
 759         p = etraxfs_dmac_run(etraxfs_dmac);
 760
 761     if (p)
 762         qemu_bh_schedule_idle(etraxfs_dmac->bh);
 763 }
 764
 765 void *etraxfs_dmac_init(hwaddr base, int nr_channels)
 766 {
 767         struct fs_dma_ctrl *ctrl = NULL;
 768
 769         ctrl = g_malloc0(sizeof *ctrl);
 770
 771         ctrl->bh = qemu_bh_new(DMA_run, ctrl);
 772
 773         ctrl->nr_channels = nr_channels;
 774         ctrl->channels = g_malloc0(sizeof ctrl->channels[0] * nr_channels);
 775
 776         memory_region_init_io(&ctrl->mmio, NULL, &dma_ops, ctrl, "etraxfs-dma",
 777                               nr_channels * 0x2000);
 778         memory_region_add_subregion(get_system_memory(), base, &ctrl->mmio);
 779
 780         return ctrl;
 781 }