hw/dma/xlnx_dpdma.c

   1 /*
   2  * xlnx_dpdma.c
   3  *
   4  *  Copyright (C) 2015 : GreenSocs Ltd
   5  *      http://www.greensocs.com/ , email: info@greensocs.com
   6  *
   7  *  Developed by :
   8  *  Frederic Konrad   <fred.konrad@greensocs.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation, either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, see <http://www.gnu.org/licenses/>.
  22  *
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "qemu-common.h"
  27 #include "qemu/log.h"
  28 #include "qemu/module.h"
  29 #include "hw/dma/xlnx_dpdma.h"
  30 #include "hw/irq.h"
  31 #include "migration/vmstate.h"
  32
  33 #ifndef DEBUG_DPDMA
  34 #define DEBUG_DPDMA 0
  35 #endif
  36
  37 #define DPRINTF(fmt, ...) do {                                                 \
  38     if (DEBUG_DPDMA) {                                                         \
  39         qemu_log("xlnx_dpdma: " fmt , ## __VA_ARGS__);                         \
  40     }                                                                          \
  41 } while (0)
  42
  43 /*
  44  * Registers offset for DPDMA.
  45  */
  46 #define DPDMA_ERR_CTRL                        (0x0000)
  47 #define DPDMA_ISR                             (0x0004 >> 2)
  48 #define DPDMA_IMR                             (0x0008 >> 2)
  49 #define DPDMA_IEN                             (0x000C >> 2)
  50 #define DPDMA_IDS                             (0x0010 >> 2)
  51 #define DPDMA_EISR                            (0x0014 >> 2)
  52 #define DPDMA_EIMR                            (0x0018 >> 2)
  53 #define DPDMA_EIEN                            (0x001C >> 2)
  54 #define DPDMA_EIDS                            (0x0020 >> 2)
  55 #define DPDMA_CNTL                            (0x0100 >> 2)
  56
  57 #define DPDMA_GBL                             (0x0104 >> 2)
  58 #define DPDMA_GBL_TRG_CH(n)                   (1 << n)
  59 #define DPDMA_GBL_RTRG_CH(n)                  (1 << 6 << n)
  60
  61 #define DPDMA_ALC0_CNTL                       (0x0108 >> 2)
  62 #define DPDMA_ALC0_STATUS                     (0x010C >> 2)
  63 #define DPDMA_ALC0_MAX                        (0x0110 >> 2)
  64 #define DPDMA_ALC0_MIN                        (0x0114 >> 2)
  65 #define DPDMA_ALC0_ACC                        (0x0118 >> 2)
  66 #define DPDMA_ALC0_ACC_TRAN                   (0x011C >> 2)
  67 #define DPDMA_ALC1_CNTL                       (0x0120 >> 2)
  68 #define DPDMA_ALC1_STATUS                     (0x0124 >> 2)
  69 #define DPDMA_ALC1_MAX                        (0x0128 >> 2)
  70 #define DPDMA_ALC1_MIN                        (0x012C >> 2)
  71 #define DPDMA_ALC1_ACC                        (0x0130 >> 2)
  72 #define DPDMA_ALC1_ACC_TRAN                   (0x0134 >> 2)
  73
  74 #define DPDMA_DSCR_STRT_ADDRE_CH(n)           ((0x0200 + n * 0x100) >> 2)
  75 #define DPDMA_DSCR_STRT_ADDR_CH(n)            ((0x0204 + n * 0x100) >> 2)
  76 #define DPDMA_DSCR_NEXT_ADDRE_CH(n)           ((0x0208 + n * 0x100) >> 2)
  77 #define DPDMA_DSCR_NEXT_ADDR_CH(n)            ((0x020C + n * 0x100) >> 2)
  78 #define DPDMA_PYLD_CUR_ADDRE_CH(n)            ((0x0210 + n * 0x100) >> 2)
  79 #define DPDMA_PYLD_CUR_ADDR_CH(n)             ((0x0214 + n * 0x100) >> 2)
  80
  81 #define DPDMA_CNTL_CH(n)                      ((0x0218 + n * 0x100) >> 2)
  82 #define DPDMA_CNTL_CH_EN                      (1)
  83 #define DPDMA_CNTL_CH_PAUSED                  (1 << 1)
  84
  85 #define DPDMA_STATUS_CH(n)                    ((0x021C + n * 0x100) >> 2)
  86 #define DPDMA_STATUS_BURST_TYPE               (1 << 4)
  87 #define DPDMA_STATUS_MODE                     (1 << 5)
  88 #define DPDMA_STATUS_EN_CRC                   (1 << 6)
  89 #define DPDMA_STATUS_LAST_DSCR                (1 << 7)
  90 #define DPDMA_STATUS_LDSCR_FRAME              (1 << 8)
  91 #define DPDMA_STATUS_IGNR_DONE                (1 << 9)
  92 #define DPDMA_STATUS_DSCR_DONE                (1 << 10)
  93 #define DPDMA_STATUS_EN_DSCR_UP               (1 << 11)
  94 #define DPDMA_STATUS_EN_DSCR_INTR             (1 << 12)
  95 #define DPDMA_STATUS_PREAMBLE_OFF             (13)
  96
  97 #define DPDMA_VDO_CH(n)                       ((0x0220 + n * 0x100) >> 2)
  98 #define DPDMA_PYLD_SZ_CH(n)                   ((0x0224 + n * 0x100) >> 2)
  99 #define DPDMA_DSCR_ID_CH(n)                   ((0x0228 + n * 0x100) >> 2)
 100
 101 /*
 102  * Descriptor control field.
 103  */
 104 #define CONTROL_PREAMBLE_VALUE                0xA5
 105
 106 #define DSCR_CTRL_PREAMBLE                    0xFF
 107 #define DSCR_CTRL_EN_DSCR_DONE_INTR           (1 << 8)
 108 #define DSCR_CTRL_EN_DSCR_UPDATE              (1 << 9)
 109 #define DSCR_CTRL_IGNORE_DONE                 (1 << 10)
 110 #define DSCR_CTRL_AXI_BURST_TYPE              (1 << 11)
 111 #define DSCR_CTRL_AXCACHE                     (0x0F << 12)
 112 #define DSCR_CTRL_AXPROT                      (0x2 << 16)
 113 #define DSCR_CTRL_DESCRIPTOR_MODE             (1 << 18)
 114 #define DSCR_CTRL_LAST_DESCRIPTOR             (1 << 19)
 115 #define DSCR_CTRL_ENABLE_CRC                  (1 << 20)
 116 #define DSCR_CTRL_LAST_DESCRIPTOR_OF_FRAME    (1 << 21)
 117
 118 /*
 119  * Descriptor timestamp field.
 120  */
 121 #define STATUS_DONE                           (1 << 31)
 122
 123 #define DPDMA_FRAG_MAX_SZ                     (4096)
 124
 125 enum DPDMABurstType {
 126     DPDMA_INCR = 0,
 127     DPDMA_FIXED = 1
 128 };
 129
 130 enum DPDMAMode {
 131     DPDMA_CONTIGOUS = 0,
 132     DPDMA_FRAGMENTED = 1
 133 };
 134
 135 struct DPDMADescriptor {
 136     uint32_t control;
 137     uint32_t descriptor_id;
 138     /* transfer size in byte. */
 139     uint32_t xfer_size;
 140     uint32_t line_size_stride;
 141     uint32_t timestamp_lsb;
 142     uint32_t timestamp_msb;
 143     /* contains extension for both descriptor and source. */
 144     uint32_t address_extension;
 145     uint32_t next_descriptor;
 146     uint32_t source_address;
 147     uint32_t address_extension_23;
 148     uint32_t address_extension_45;
 149     uint32_t source_address2;
 150     uint32_t source_address3;
 151     uint32_t source_address4;
 152     uint32_t source_address5;
 153     uint32_t crc;
 154 };
 155
 156 typedef enum DPDMABurstType DPDMABurstType;
 157 typedef enum DPDMAMode DPDMAMode;
 158 typedef struct DPDMADescriptor DPDMADescriptor;
 159
 160 static bool xlnx_dpdma_desc_is_last(DPDMADescriptor *desc)
 161 {
 162     return ((desc->control & DSCR_CTRL_LAST_DESCRIPTOR) != 0);
 163 }
 164
 165 static bool xlnx_dpdma_desc_is_last_of_frame(DPDMADescriptor *desc)
 166 {
 167     return ((desc->control & DSCR_CTRL_LAST_DESCRIPTOR_OF_FRAME) != 0);
 168 }
 169
 170 static uint64_t xlnx_dpdma_desc_get_source_address(DPDMADescriptor *desc,
 171                                                      uint8_t frag)
 172 {
 173     uint64_t addr = 0;
 174     assert(frag < 5);
 175
 176     switch (frag) {
 177     case 0:
 178         addr = desc->source_address
 179             + (extract32(desc->address_extension, 16, 12) << 20);
 180         break;
 181     case 1:
 182         addr = desc->source_address2
 183             + (extract32(desc->address_extension_23, 0, 12) << 8);
 184         break;
 185     case 2:
 186         addr = desc->source_address3
 187             + (extract32(desc->address_extension_23, 16, 12) << 20);
 188         break;
 189     case 3:
 190         addr = desc->source_address4
 191             + (extract32(desc->address_extension_45, 0, 12) << 8);
 192         break;
 193     case 4:
 194         addr = desc->source_address5
 195             + (extract32(desc->address_extension_45, 16, 12) << 20);
 196         break;
 197     default:
 198         addr = 0;
 199         break;
 200     }
 201
 202     return addr;
 203 }
 204
 205 static uint32_t xlnx_dpdma_desc_get_transfer_size(DPDMADescriptor *desc)
 206 {
 207     return desc->xfer_size;
 208 }
 209
 210 static uint32_t xlnx_dpdma_desc_get_line_size(DPDMADescriptor *desc)
 211 {
 212     return extract32(desc->line_size_stride, 0, 18);
 213 }
 214
 215 static uint32_t xlnx_dpdma_desc_get_line_stride(DPDMADescriptor *desc)
 216 {
 217     return extract32(desc->line_size_stride, 18, 14) * 16;
 218 }
 219
 220 static inline bool xlnx_dpdma_desc_crc_enabled(DPDMADescriptor *desc)
 221 {
 222     return (desc->control & DSCR_CTRL_ENABLE_CRC) != 0;
 223 }
 224
 225 static inline bool xlnx_dpdma_desc_check_crc(DPDMADescriptor *desc)
 226 {
 227     uint32_t *p = (uint32_t *)desc;
 228     uint32_t crc = 0;
 229     uint8_t i;
 230
 231     /*
 232      * CRC is calculated on the whole descriptor except the last 32bits word
 233      * using 32bits addition.
 234      */
 235     for (i = 0; i < 15; i++) {
 236         crc += p[i];
 237     }
 238
 239     return crc == desc->crc;
 240 }
 241
 242 static inline bool xlnx_dpdma_desc_completion_interrupt(DPDMADescriptor *desc)
 243 {
 244     return (desc->control & DSCR_CTRL_EN_DSCR_DONE_INTR) != 0;
 245 }
 246
 247 static inline bool xlnx_dpdma_desc_is_valid(DPDMADescriptor *desc)
 248 {
 249     return (desc->control & DSCR_CTRL_PREAMBLE) == CONTROL_PREAMBLE_VALUE;
 250 }
 251
 252 static inline bool xlnx_dpdma_desc_is_contiguous(DPDMADescriptor *desc)
 253 {
 254     return (desc->control & DSCR_CTRL_DESCRIPTOR_MODE) == 0;
 255 }
 256
 257 static inline bool xlnx_dpdma_desc_update_enabled(DPDMADescriptor *desc)
 258 {
 259     return (desc->control & DSCR_CTRL_EN_DSCR_UPDATE) != 0;
 260 }
 261
 262 static inline void xlnx_dpdma_desc_set_done(DPDMADescriptor *desc)
 263 {
 264     desc->timestamp_msb |= STATUS_DONE;
 265 }
 266
 267 static inline bool xlnx_dpdma_desc_is_already_done(DPDMADescriptor *desc)
 268 {
 269     return (desc->timestamp_msb & STATUS_DONE) != 0;
 270 }
 271
 272 static inline bool xlnx_dpdma_desc_ignore_done_bit(DPDMADescriptor *desc)
 273 {
 274     return (desc->control & DSCR_CTRL_IGNORE_DONE) != 0;
 275 }
 276
 277 static const VMStateDescription vmstate_xlnx_dpdma = {
 278     .name = TYPE_XLNX_DPDMA,
 279     .version_id = 1,
 280     .fields = (VMStateField[]) {
 281         VMSTATE_UINT32_ARRAY(registers, XlnxDPDMAState,
 282                              XLNX_DPDMA_REG_ARRAY_SIZE),
 283         VMSTATE_BOOL_ARRAY(operation_finished, XlnxDPDMAState, 6),
 284         VMSTATE_END_OF_LIST()
 285     }
 286 };
 287
 288 static void xlnx_dpdma_update_irq(XlnxDPDMAState *s)
 289 {
 290     bool flags;
 291
 292     flags = ((s->registers[DPDMA_ISR] & (~s->registers[DPDMA_IMR]))
 293           || (s->registers[DPDMA_EISR] & (~s->registers[DPDMA_EIMR])));
 294     qemu_set_irq(s->irq, flags);
 295 }
 296
 297 static uint64_t xlnx_dpdma_descriptor_start_address(XlnxDPDMAState *s,
 298                                                       uint8_t channel)
 299 {
 300     return (s->registers[DPDMA_DSCR_STRT_ADDRE_CH(channel)] << 16)
 301           + s->registers[DPDMA_DSCR_STRT_ADDR_CH(channel)];
 302 }
 303
 304 static uint64_t xlnx_dpdma_descriptor_next_address(XlnxDPDMAState *s,
 305                                                      uint8_t channel)
 306 {
 307     return ((uint64_t)s->registers[DPDMA_DSCR_NEXT_ADDRE_CH(channel)] << 32)
 308            + s->registers[DPDMA_DSCR_NEXT_ADDR_CH(channel)];
 309 }
 310
 311 static bool xlnx_dpdma_is_channel_enabled(XlnxDPDMAState *s,
 312                                             uint8_t channel)
 313 {
 314     return (s->registers[DPDMA_CNTL_CH(channel)] & DPDMA_CNTL_CH_EN) != 0;
 315 }
 316
 317 static bool xlnx_dpdma_is_channel_paused(XlnxDPDMAState *s,
 318                                            uint8_t channel)
 319 {
 320     return (s->registers[DPDMA_CNTL_CH(channel)] & DPDMA_CNTL_CH_PAUSED) != 0;
 321 }
 322
 323 static inline bool xlnx_dpdma_is_channel_retriggered(XlnxDPDMAState *s,
 324                                                        uint8_t channel)
 325 {
 326     /* Clear the retriggered bit after reading it. */
 327     bool channel_is_retriggered = s->registers[DPDMA_GBL]
 328                                 & DPDMA_GBL_RTRG_CH(channel);
 329     s->registers[DPDMA_GBL] &= ~DPDMA_GBL_RTRG_CH(channel);
 330     return channel_is_retriggered;
 331 }
 332
 333 static inline bool xlnx_dpdma_is_channel_triggered(XlnxDPDMAState *s,
 334                                                      uint8_t channel)
 335 {
 336     return s->registers[DPDMA_GBL] & DPDMA_GBL_TRG_CH(channel);
 337 }
 338
 339 static void xlnx_dpdma_update_desc_info(XlnxDPDMAState *s, uint8_t channel,
 340                                           DPDMADescriptor *desc)
 341 {
 342     s->registers[DPDMA_DSCR_NEXT_ADDRE_CH(channel)] =
 343                                 extract32(desc->address_extension, 0, 16);
 344     s->registers[DPDMA_DSCR_NEXT_ADDR_CH(channel)] = desc->next_descriptor;
 345     s->registers[DPDMA_PYLD_CUR_ADDRE_CH(channel)] =
 346                                 extract32(desc->address_extension, 16, 16);
 347     s->registers[DPDMA_PYLD_CUR_ADDR_CH(channel)] = desc->source_address;
 348     s->registers[DPDMA_VDO_CH(channel)] =
 349                                 extract32(desc->line_size_stride, 18, 14)
 350                                 + (extract32(desc->line_size_stride, 0, 18)
 351                                   << 14);
 352     s->registers[DPDMA_PYLD_SZ_CH(channel)] = desc->xfer_size;
 353     s->registers[DPDMA_DSCR_ID_CH(channel)] = desc->descriptor_id;
 354
 355     /* Compute the status register with the descriptor information. */
 356     s->registers[DPDMA_STATUS_CH(channel)] =
 357                                 extract32(desc->control, 0, 8) << 13;
 358     if ((desc->control & DSCR_CTRL_EN_DSCR_DONE_INTR) != 0) {
 359         s->registers[DPDMA_STATUS_CH(channel)] |= DPDMA_STATUS_EN_DSCR_INTR;
 360     }
 361     if ((desc->control & DSCR_CTRL_EN_DSCR_UPDATE) != 0) {
 362         s->registers[DPDMA_STATUS_CH(channel)] |= DPDMA_STATUS_EN_DSCR_UP;
 363     }
 364     if ((desc->timestamp_msb & STATUS_DONE) != 0) {
 365         s->registers[DPDMA_STATUS_CH(channel)] |= DPDMA_STATUS_DSCR_DONE;
 366     }
 367     if ((desc->control & DSCR_CTRL_IGNORE_DONE) != 0) {
 368         s->registers[DPDMA_STATUS_CH(channel)] |= DPDMA_STATUS_IGNR_DONE;
 369     }
 370     if ((desc->control & DSCR_CTRL_LAST_DESCRIPTOR_OF_FRAME) != 0) {
 371         s->registers[DPDMA_STATUS_CH(channel)] |= DPDMA_STATUS_LDSCR_FRAME;
 372     }
 373     if ((desc->control & DSCR_CTRL_LAST_DESCRIPTOR) != 0) {
 374         s->registers[DPDMA_STATUS_CH(channel)] |= DPDMA_STATUS_LAST_DSCR;
 375     }
 376     if ((desc->control & DSCR_CTRL_ENABLE_CRC) != 0) {
 377         s->registers[DPDMA_STATUS_CH(channel)] |= DPDMA_STATUS_EN_CRC;
 378     }
 379     if ((desc->control & DSCR_CTRL_DESCRIPTOR_MODE) != 0) {
 380         s->registers[DPDMA_STATUS_CH(channel)] |= DPDMA_STATUS_MODE;
 381     }
 382     if ((desc->control & DSCR_CTRL_AXI_BURST_TYPE) != 0) {
 383         s->registers[DPDMA_STATUS_CH(channel)] |= DPDMA_STATUS_BURST_TYPE;
 384     }
 385 }
 386
 387 static void xlnx_dpdma_dump_descriptor(DPDMADescriptor *desc)
 388 {
 389     if (DEBUG_DPDMA) {
 390         qemu_log("DUMP DESCRIPTOR:\n");
 391         qemu_hexdump(stdout, "", desc, sizeof(DPDMADescriptor));
 392     }
 393 }
 394
 395 static uint64_t xlnx_dpdma_read(void *opaque, hwaddr offset,
 396                                 unsigned size)
 397 {
 398     XlnxDPDMAState *s = XLNX_DPDMA(opaque);
 399
 400     DPRINTF("read @%" HWADDR_PRIx "\n", offset);
 401     offset = offset >> 2;
 402
 403     switch (offset) {
 404     /*
 405      * Trying to read a write only register.
 406      */
 407     case DPDMA_GBL:
 408         return 0;
 409     default:
 410         assert(offset <= (0xFFC >> 2));
 411         return s->registers[offset];
 412     }
 413     return 0;
 414 }
 415
 416 static void xlnx_dpdma_write(void *opaque, hwaddr offset,
 417                                uint64_t value, unsigned size)
 418 {
 419     XlnxDPDMAState *s = XLNX_DPDMA(opaque);
 420
 421     DPRINTF("write @%" HWADDR_PRIx " = %" PRIx64 "\n", offset, value);
 422     offset = offset >> 2;
 423
 424     switch (offset) {
 425     case DPDMA_ISR:
 426         s->registers[DPDMA_ISR] &= ~value;
 427         xlnx_dpdma_update_irq(s);
 428         break;
 429     case DPDMA_IEN:
 430         s->registers[DPDMA_IMR] &= ~value;
 431         break;
 432     case DPDMA_IDS:
 433         s->registers[DPDMA_IMR] |= value;
 434         break;
 435     case DPDMA_EISR:
 436         s->registers[DPDMA_EISR] &= ~value;
 437         xlnx_dpdma_update_irq(s);
 438         break;
 439     case DPDMA_EIEN:
 440         s->registers[DPDMA_EIMR] &= ~value;
 441         break;
 442     case DPDMA_EIDS:
 443         s->registers[DPDMA_EIMR] |= value;
 444         break;
 445     case DPDMA_IMR:
 446     case DPDMA_EIMR:
 447     case DPDMA_DSCR_NEXT_ADDRE_CH(0):
 448     case DPDMA_DSCR_NEXT_ADDRE_CH(1):
 449     case DPDMA_DSCR_NEXT_ADDRE_CH(2):
 450     case DPDMA_DSCR_NEXT_ADDRE_CH(3):
 451     case DPDMA_DSCR_NEXT_ADDRE_CH(4):
 452     case DPDMA_DSCR_NEXT_ADDRE_CH(5):
 453     case DPDMA_DSCR_NEXT_ADDR_CH(0):
 454     case DPDMA_DSCR_NEXT_ADDR_CH(1):
 455     case DPDMA_DSCR_NEXT_ADDR_CH(2):
 456     case DPDMA_DSCR_NEXT_ADDR_CH(3):
 457     case DPDMA_DSCR_NEXT_ADDR_CH(4):
 458     case DPDMA_DSCR_NEXT_ADDR_CH(5):
 459     case DPDMA_PYLD_CUR_ADDRE_CH(0):
 460     case DPDMA_PYLD_CUR_ADDRE_CH(1):
 461     case DPDMA_PYLD_CUR_ADDRE_CH(2):
 462     case DPDMA_PYLD_CUR_ADDRE_CH(3):
 463     case DPDMA_PYLD_CUR_ADDRE_CH(4):
 464     case DPDMA_PYLD_CUR_ADDRE_CH(5):
 465     case DPDMA_PYLD_CUR_ADDR_CH(0):
 466     case DPDMA_PYLD_CUR_ADDR_CH(1):
 467     case DPDMA_PYLD_CUR_ADDR_CH(2):
 468     case DPDMA_PYLD_CUR_ADDR_CH(3):
 469     case DPDMA_PYLD_CUR_ADDR_CH(4):
 470     case DPDMA_PYLD_CUR_ADDR_CH(5):
 471     case DPDMA_STATUS_CH(0):
 472     case DPDMA_STATUS_CH(1):
 473     case DPDMA_STATUS_CH(2):
 474     case DPDMA_STATUS_CH(3):
 475     case DPDMA_STATUS_CH(4):
 476     case DPDMA_STATUS_CH(5):
 477     case DPDMA_VDO_CH(0):
 478     case DPDMA_VDO_CH(1):
 479     case DPDMA_VDO_CH(2):
 480     case DPDMA_VDO_CH(3):
 481     case DPDMA_VDO_CH(4):
 482     case DPDMA_VDO_CH(5):
 483     case DPDMA_PYLD_SZ_CH(0):
 484     case DPDMA_PYLD_SZ_CH(1):
 485     case DPDMA_PYLD_SZ_CH(2):
 486     case DPDMA_PYLD_SZ_CH(3):
 487     case DPDMA_PYLD_SZ_CH(4):
 488     case DPDMA_PYLD_SZ_CH(5):
 489     case DPDMA_DSCR_ID_CH(0):
 490     case DPDMA_DSCR_ID_CH(1):
 491     case DPDMA_DSCR_ID_CH(2):
 492     case DPDMA_DSCR_ID_CH(3):
 493     case DPDMA_DSCR_ID_CH(4):
 494     case DPDMA_DSCR_ID_CH(5):
 495         /*
 496          * Trying to write to a read only register..
 497          */
 498         break;
 499     case DPDMA_GBL:
 500         /*
 501          * This is a write only register so it's read as zero in the read
 502          * callback.
 503          * We store the value anyway so we can know if the channel is
 504          * enabled.
 505          */
 506         s->registers[offset] |= value & 0x00000FFF;
 507         break;
 508     case DPDMA_DSCR_STRT_ADDRE_CH(0):
 509     case DPDMA_DSCR_STRT_ADDRE_CH(1):
 510     case DPDMA_DSCR_STRT_ADDRE_CH(2):
 511     case DPDMA_DSCR_STRT_ADDRE_CH(3):
 512     case DPDMA_DSCR_STRT_ADDRE_CH(4):
 513     case DPDMA_DSCR_STRT_ADDRE_CH(5):
 514         value &= 0x0000FFFF;
 515         s->registers[offset] = value;
 516         break;
 517     case DPDMA_CNTL_CH(0):
 518         s->registers[DPDMA_GBL] &= ~DPDMA_GBL_TRG_CH(0);
 519         value &= 0x3FFFFFFF;
 520         s->registers[offset] = value;
 521         break;
 522     case DPDMA_CNTL_CH(1):
 523         s->registers[DPDMA_GBL] &= ~DPDMA_GBL_TRG_CH(1);
 524         value &= 0x3FFFFFFF;
 525         s->registers[offset] = value;
 526         break;
 527     case DPDMA_CNTL_CH(2):
 528         s->registers[DPDMA_GBL] &= ~DPDMA_GBL_TRG_CH(2);
 529         value &= 0x3FFFFFFF;
 530         s->registers[offset] = value;
 531         break;
 532     case DPDMA_CNTL_CH(3):
 533         s->registers[DPDMA_GBL] &= ~DPDMA_GBL_TRG_CH(3);
 534         value &= 0x3FFFFFFF;
 535         s->registers[offset] = value;
 536         break;
 537     case DPDMA_CNTL_CH(4):
 538         s->registers[DPDMA_GBL] &= ~DPDMA_GBL_TRG_CH(4);
 539         value &= 0x3FFFFFFF;
 540         s->registers[offset] = value;
 541         break;
 542     case DPDMA_CNTL_CH(5):
 543         s->registers[DPDMA_GBL] &= ~DPDMA_GBL_TRG_CH(5);
 544         value &= 0x3FFFFFFF;
 545         s->registers[offset] = value;
 546         break;
 547     default:
 548         assert(offset <= (0xFFC >> 2));
 549         s->registers[offset] = value;
 550         break;
 551     }
 552 }
 553
 554 static const MemoryRegionOps dma_ops = {
 555     .read = xlnx_dpdma_read,
 556     .write = xlnx_dpdma_write,
 557     .endianness = DEVICE_NATIVE_ENDIAN,
 558     .valid = {
 559         .min_access_size = 4,
 560         .max_access_size = 4,
 561     },
 562     .impl = {
 563         .min_access_size = 4,
 564         .max_access_size = 4,
 565     },
 566 };
 567
 568 static void xlnx_dpdma_init(Object *obj)
 569 {
 570     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 571     XlnxDPDMAState *s = XLNX_DPDMA(obj);
 572
 573     memory_region_init_io(&s->iomem, obj, &dma_ops, s,
 574                           TYPE_XLNX_DPDMA, 0x1000);
 575     sysbus_init_mmio(sbd, &s->iomem);
 576     sysbus_init_irq(sbd, &s->irq);
 577 }
 578
 579 static void xlnx_dpdma_reset(DeviceState *dev)
 580 {
 581     XlnxDPDMAState *s = XLNX_DPDMA(dev);
 582     size_t i;
 583
 584     memset(s->registers, 0, sizeof(s->registers));
 585     s->registers[DPDMA_IMR] =  0x07FFFFFF;
 586     s->registers[DPDMA_EIMR] = 0xFFFFFFFF;
 587     s->registers[DPDMA_ALC0_MIN] = 0x0000FFFF;
 588     s->registers[DPDMA_ALC1_MIN] = 0x0000FFFF;
 589
 590     for (i = 0; i < 6; i++) {
 591         s->data[i] = NULL;
 592         s->operation_finished[i] = true;
 593     }
 594 }
 595
 596 static void xlnx_dpdma_class_init(ObjectClass *oc, void *data)
 597 {
 598     DeviceClass *dc = DEVICE_CLASS(oc);
 599
 600     dc->vmsd = &vmstate_xlnx_dpdma;
 601     dc->reset = xlnx_dpdma_reset;
 602 }
 603
 604 static const TypeInfo xlnx_dpdma_info = {
 605     .name          = TYPE_XLNX_DPDMA,
 606     .parent        = TYPE_SYS_BUS_DEVICE,
 607     .instance_size = sizeof(XlnxDPDMAState),
 608     .instance_init = xlnx_dpdma_init,
 609     .class_init    = xlnx_dpdma_class_init,
 610 };
 611
 612 static void xlnx_dpdma_register_types(void)
 613 {
 614     type_register_static(&xlnx_dpdma_info);
 615 }
 616
 617 size_t xlnx_dpdma_start_operation(XlnxDPDMAState *s, uint8_t channel,
 618                                     bool one_desc)
 619 {
 620     uint64_t desc_addr;
 621     uint64_t source_addr[6];
 622     DPDMADescriptor desc;
 623     bool done = false;
 624     size_t ptr = 0;
 625
 626     assert(channel <= 5);
 627
 628     DPRINTF("start dpdma channel 0x%" PRIX8 "\n", channel);
 629
 630     if (!xlnx_dpdma_is_channel_triggered(s, channel)) {
 631         DPRINTF("Channel isn't triggered..\n");
 632         return 0;
 633     }
 634
 635     if (!xlnx_dpdma_is_channel_enabled(s, channel)) {
 636         DPRINTF("Channel isn't enabled..\n");
 637         return 0;
 638     }
 639
 640     if (xlnx_dpdma_is_channel_paused(s, channel)) {
 641         DPRINTF("Channel is paused..\n");
 642         return 0;
 643     }
 644
 645     do {
 646         if ((s->operation_finished[channel])
 647           || xlnx_dpdma_is_channel_retriggered(s, channel)) {
 648             desc_addr = xlnx_dpdma_descriptor_start_address(s, channel);
 649             s->operation_finished[channel] = false;
 650         } else {
 651             desc_addr = xlnx_dpdma_descriptor_next_address(s, channel);
 652         }
 653
 654         if (dma_memory_read(&address_space_memory, desc_addr, &desc,
 655                             sizeof(DPDMADescriptor))) {
 656             s->registers[DPDMA_EISR] |= ((1 << 1) << channel);
 657             xlnx_dpdma_update_irq(s);
 658             s->operation_finished[channel] = true;
 659             DPRINTF("Can't get the descriptor.\n");
 660             break;
 661         }
 662
 663         xlnx_dpdma_update_desc_info(s, channel, &desc);
 664
 665 #ifdef DEBUG_DPDMA
 666         xlnx_dpdma_dump_descriptor(&desc);
 667 #endif
 668
 669         DPRINTF("location of the descriptor: %" PRIx64 "\n", desc_addr);
 670         if (!xlnx_dpdma_desc_is_valid(&desc)) {
 671             s->registers[DPDMA_EISR] |= ((1 << 7) << channel);
 672             xlnx_dpdma_update_irq(s);
 673             s->operation_finished[channel] = true;
 674             DPRINTF("Invalid descriptor..\n");
 675             break;
 676         }
 677
 678         if (xlnx_dpdma_desc_crc_enabled(&desc)
 679             && !xlnx_dpdma_desc_check_crc(&desc)) {
 680             s->registers[DPDMA_EISR] |= ((1 << 13) << channel);
 681             xlnx_dpdma_update_irq(s);
 682             s->operation_finished[channel] = true;
 683             DPRINTF("Bad CRC for descriptor..\n");
 684             break;
 685         }
 686
 687         if (xlnx_dpdma_desc_is_already_done(&desc)
 688             && !xlnx_dpdma_desc_ignore_done_bit(&desc)) {
 689             /* We are trying to process an already processed descriptor. */
 690             s->registers[DPDMA_EISR] |= ((1 << 25) << channel);
 691             xlnx_dpdma_update_irq(s);
 692             s->operation_finished[channel] = true;
 693             DPRINTF("Already processed descriptor..\n");
 694             break;
 695         }
 696
 697         done = xlnx_dpdma_desc_is_last(&desc)
 698              || xlnx_dpdma_desc_is_last_of_frame(&desc);
 699
 700         s->operation_finished[channel] = done;
 701         if (s->data[channel]) {
 702             int64_t transfer_len = xlnx_dpdma_desc_get_transfer_size(&desc);
 703             uint32_t line_size = xlnx_dpdma_desc_get_line_size(&desc);
 704             uint32_t line_stride = xlnx_dpdma_desc_get_line_stride(&desc);
 705             if (xlnx_dpdma_desc_is_contiguous(&desc)) {
 706                 source_addr[0] = xlnx_dpdma_desc_get_source_address(&desc, 0);
 707                 while (transfer_len != 0) {
 708                     if (dma_memory_read(&address_space_memory,
 709                                         source_addr[0],
 710                                         &s->data[channel][ptr],
 711                                         line_size)) {
 712                         s->registers[DPDMA_ISR] |= ((1 << 12) << channel);
 713                         xlnx_dpdma_update_irq(s);
 714                         DPRINTF("Can't get data.\n");
 715                         break;
 716                     }
 717                     ptr += line_size;
 718                     transfer_len -= line_size;
 719                     source_addr[0] += line_stride;
 720                 }
 721             } else {
 722                 DPRINTF("Source address:\n");
 723                 int frag;
 724                 for (frag = 0; frag < 5; frag++) {
 725                     source_addr[frag] =
 726                           xlnx_dpdma_desc_get_source_address(&desc, frag);
 727                     DPRINTF("Fragment %u: %" PRIx64 "\n", frag + 1,
 728                             source_addr[frag]);
 729                 }
 730
 731                 frag = 0;
 732                 while ((transfer_len < 0) && (frag < 5)) {
 733                     size_t fragment_len = DPDMA_FRAG_MAX_SZ
 734                                     - (source_addr[frag] % DPDMA_FRAG_MAX_SZ);
 735
 736                     if (dma_memory_read(&address_space_memory,
 737                                         source_addr[frag],
 738                                         &(s->data[channel][ptr]),
 739                                         fragment_len)) {
 740                         s->registers[DPDMA_ISR] |= ((1 << 12) << channel);
 741                         xlnx_dpdma_update_irq(s);
 742                         DPRINTF("Can't get data.\n");
 743                         break;
 744                     }
 745                     ptr += fragment_len;
 746                     transfer_len -= fragment_len;
 747                     frag += 1;
 748                 }
 749             }
 750         }
 751
 752         if (xlnx_dpdma_desc_update_enabled(&desc)) {
 753             /* The descriptor need to be updated when it's completed. */
 754             DPRINTF("update the descriptor with the done flag set.\n");
 755             xlnx_dpdma_desc_set_done(&desc);
 756             dma_memory_write(&address_space_memory, desc_addr, &desc,
 757                              sizeof(DPDMADescriptor));
 758         }
 759
 760         if (xlnx_dpdma_desc_completion_interrupt(&desc)) {
 761             DPRINTF("completion interrupt enabled!\n");
 762             s->registers[DPDMA_ISR] |= (1 << channel);
 763             xlnx_dpdma_update_irq(s);
 764         }
 765
 766     } while (!done && !one_desc);
 767
 768     return ptr;
 769 }
 770
 771 void xlnx_dpdma_set_host_data_location(XlnxDPDMAState *s, uint8_t channel,
 772                                          void *p)
 773 {
 774     if (!s) {
 775         qemu_log_mask(LOG_UNIMP, "DPDMA client not attached to valid DPDMA"
 776                       " instance\n");
 777         return;
 778     }
 779
 780     assert(channel <= 5);
 781     s->data[channel] = p;
 782 }
 783
 784 void xlnx_dpdma_trigger_vsync_irq(XlnxDPDMAState *s)
 785 {
 786     s->registers[DPDMA_ISR] |= (1 << 27);
 787     xlnx_dpdma_update_irq(s);
 788 }
 789
 790 type_init(xlnx_dpdma_register_types)