SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/staging/cx25821/cx25821-audio-upstream.c

   1 /*
   2  *  Driver for the Conexant CX25821 PCIe bridge
   3  *
   4  *  Copyright (C) 2009 Conexant Systems Inc.
   5  *  Authors  <hiep.huynh@conexant.com>, <shu.lin@conexant.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include "cx25821-video.h"
  24 #include "cx25821-audio-upstream.h"
  25
  26 #include <linux/fs.h>
  27 #include <linux/errno.h>
  28 #include <linux/kernel.h>
  29 #include <linux/init.h>
  30 #include <linux/module.h>
  31 #include <linux/syscalls.h>
  32 #include <linux/file.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/delay.h>
  35 #include <linux/slab.h>
  36 #include <asm/uaccess.h>
  37
  38 MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
  39 MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");
  40 MODULE_LICENSE("GPL");
  41
  42 static int _intr_msk =
  43     FLD_AUD_SRC_RISCI1 | FLD_AUD_SRC_OF | FLD_AUD_SRC_SYNC |
  44     FLD_AUD_SRC_OPC_ERR;
  45
  46 int cx25821_sram_channel_setup_upstream_audio(struct cx25821_dev *dev,
  47                                               struct sram_channel *ch,
  48                                               unsigned int bpl, u32 risc)
  49 {
  50         unsigned int i, lines;
  51         u32 cdt;
  52
  53         if (ch->cmds_start == 0) {
  54                 cx_write(ch->ptr1_reg, 0);
  55                 cx_write(ch->ptr2_reg, 0);
  56                 cx_write(ch->cnt2_reg, 0);
  57                 cx_write(ch->cnt1_reg, 0);
  58                 return 0;
  59         }
  60
  61         bpl = (bpl + 7) & ~7;   /* alignment */
  62         cdt = ch->cdt;
  63         lines = ch->fifo_size / bpl;
  64
  65         if (lines > 3) {
  66                 lines = 3;
  67         }
  68
  69         BUG_ON(lines < 2);
  70
  71         /* write CDT */
  72         for (i = 0; i < lines; i++) {
  73                 cx_write(cdt + 16 * i, ch->fifo_start + bpl * i);
  74                 cx_write(cdt + 16 * i + 4, 0);
  75                 cx_write(cdt + 16 * i + 8, 0);
  76                 cx_write(cdt + 16 * i + 12, 0);
  77         }
  78
  79         /* write CMDS */
  80         cx_write(ch->cmds_start + 0, risc);
  81
  82         cx_write(ch->cmds_start + 4, 0);
  83         cx_write(ch->cmds_start + 8, cdt);
  84         cx_write(ch->cmds_start + 12, AUDIO_CDT_SIZE_QW);
  85         cx_write(ch->cmds_start + 16, ch->ctrl_start);
  86
  87         //IQ size
  88         cx_write(ch->cmds_start + 20, AUDIO_IQ_SIZE_DW);
  89
  90         for (i = 24; i < 80; i += 4)
  91                 cx_write(ch->cmds_start + i, 0);
  92
  93         /* fill registers */
  94         cx_write(ch->ptr1_reg, ch->fifo_start);
  95         cx_write(ch->ptr2_reg, cdt);
  96         cx_write(ch->cnt2_reg, AUDIO_CDT_SIZE_QW);
  97         cx_write(ch->cnt1_reg, AUDIO_CLUSTER_SIZE_QW - 1);
  98
  99         return 0;
 100 }
 101
 102 static __le32 *cx25821_risc_field_upstream_audio(struct cx25821_dev *dev,
 103                                                  __le32 * rp,
 104                                                  dma_addr_t databuf_phys_addr,
 105                                                  unsigned int bpl,
 106                                                  int fifo_enable)
 107 {
 108         unsigned int line;
 109         struct sram_channel *sram_ch =
 110             &dev->sram_channels[dev->_audio_upstream_channel_select];
 111         int offset = 0;
 112
 113         /* scan lines */
 114         for (line = 0; line < LINES_PER_AUDIO_BUFFER; line++) {
 115                 *(rp++) = cpu_to_le32(RISC_READ | RISC_SOL | RISC_EOL | bpl);
 116                 *(rp++) = cpu_to_le32(databuf_phys_addr + offset);
 117                 *(rp++) = cpu_to_le32(0);       /* bits 63-32 */
 118
 119                 // Check if we need to enable the FIFO after the first 3 lines
 120                 // For the upstream audio channel, the risc engine will enable the FIFO.
 121                 if (fifo_enable && line == 2) {
 122                         *(rp++) = RISC_WRITECR;
 123                         *(rp++) = sram_ch->dma_ctl;
 124                         *(rp++) = sram_ch->fld_aud_fifo_en;
 125                         *(rp++) = 0x00000020;
 126                 }
 127
 128                 offset += AUDIO_LINE_SIZE;
 129         }
 130
 131         return rp;
 132 }
 133
 134 int cx25821_risc_buffer_upstream_audio(struct cx25821_dev *dev,
 135                                        struct pci_dev *pci,
 136                                        unsigned int bpl, unsigned int lines)
 137 {
 138         __le32 *rp;
 139         int fifo_enable = 0;
 140         int frame = 0, i = 0;
 141         int frame_size = AUDIO_DATA_BUF_SZ;
 142         int databuf_offset = 0;
 143         int risc_flag = RISC_CNT_INC;
 144         dma_addr_t risc_phys_jump_addr;
 145
 146         /* Virtual address of Risc buffer program */
 147         rp = dev->_risc_virt_addr;
 148
 149         /* sync instruction */
 150         *(rp++) = cpu_to_le32(RISC_RESYNC | AUDIO_SYNC_LINE);
 151
 152         for (frame = 0; frame < NUM_AUDIO_FRAMES; frame++) {
 153                 databuf_offset = frame_size * frame;
 154
 155                 if (frame == 0) {
 156                         fifo_enable = 1;
 157                         risc_flag = RISC_CNT_RESET;
 158                 } else {
 159                         fifo_enable = 0;
 160                         risc_flag = RISC_CNT_INC;
 161                 }
 162
 163                 //Calculate physical jump address
 164                 if ((frame + 1) == NUM_AUDIO_FRAMES) {
 165                         risc_phys_jump_addr =
 166                             dev->_risc_phys_start_addr +
 167                             RISC_SYNC_INSTRUCTION_SIZE;
 168                 } else {
 169                         risc_phys_jump_addr =
 170                             dev->_risc_phys_start_addr +
 171                             RISC_SYNC_INSTRUCTION_SIZE +
 172                             AUDIO_RISC_DMA_BUF_SIZE * (frame + 1);
 173                 }
 174
 175                 rp = cx25821_risc_field_upstream_audio(dev, rp,
 176                                                        dev->
 177                                                        _audiodata_buf_phys_addr
 178                                                        + databuf_offset, bpl,
 179                                                        fifo_enable);
 180
 181                 if (USE_RISC_NOOP_AUDIO) {
 182                         for (i = 0; i < NUM_NO_OPS; i++) {
 183                                 *(rp++) = cpu_to_le32(RISC_NOOP);
 184                         }
 185                 }
 186
 187                 // Loop to (Nth)FrameRISC or to Start of Risc program & generate IRQ
 188                 *(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | risc_flag);
 189                 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
 190                 *(rp++) = cpu_to_le32(0);
 191
 192                 //Recalculate virtual address based on frame index
 193                 rp = dev->_risc_virt_addr + RISC_SYNC_INSTRUCTION_SIZE / 4 +
 194                     (AUDIO_RISC_DMA_BUF_SIZE * (frame + 1) / 4);
 195         }
 196
 197         return 0;
 198 }
 199
 200 void cx25821_free_memory_audio(struct cx25821_dev *dev)
 201 {
 202         if (dev->_risc_virt_addr) {
 203                 pci_free_consistent(dev->pci, dev->_audiorisc_size,
 204                                     dev->_risc_virt_addr, dev->_risc_phys_addr);
 205                 dev->_risc_virt_addr = NULL;
 206         }
 207
 208         if (dev->_audiodata_buf_virt_addr) {
 209                 pci_free_consistent(dev->pci, dev->_audiodata_buf_size,
 210                                     dev->_audiodata_buf_virt_addr,
 211                                     dev->_audiodata_buf_phys_addr);
 212                 dev->_audiodata_buf_virt_addr = NULL;
 213         }
 214 }
 215
 216 void cx25821_stop_upstream_audio(struct cx25821_dev *dev)
 217 {
 218         struct sram_channel *sram_ch =
 219             &dev->sram_channels[AUDIO_UPSTREAM_SRAM_CHANNEL_B];
 220         u32 tmp = 0;
 221
 222         if (!dev->_audio_is_running) {
 223                 printk
 224                     ("cx25821: No audio file is currently running so return!\n");
 225                 return;
 226         }
 227         //Disable RISC interrupts
 228         cx_write(sram_ch->int_msk, 0);
 229
 230         //Turn OFF risc and fifo enable in AUD_DMA_CNTRL
 231         tmp = cx_read(sram_ch->dma_ctl);
 232         cx_write(sram_ch->dma_ctl,
 233                  tmp & ~(sram_ch->fld_aud_fifo_en | sram_ch->fld_aud_risc_en));
 234
 235         //Clear data buffer memory
 236         if (dev->_audiodata_buf_virt_addr)
 237                 memset(dev->_audiodata_buf_virt_addr, 0,
 238                        dev->_audiodata_buf_size);
 239
 240         dev->_audio_is_running = 0;
 241         dev->_is_first_audio_frame = 0;
 242         dev->_audioframe_count = 0;
 243         dev->_audiofile_status = END_OF_FILE;
 244
 245         if (dev->_irq_audio_queues) {
 246                 kfree(dev->_irq_audio_queues);
 247                 dev->_irq_audio_queues = NULL;
 248         }
 249
 250         if (dev->_audiofilename != NULL)
 251                 kfree(dev->_audiofilename);
 252 }
 253
 254 void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
 255 {
 256         if (dev->_audio_is_running) {
 257                 cx25821_stop_upstream_audio(dev);
 258         }
 259
 260         cx25821_free_memory_audio(dev);
 261 }
 262
 263 int cx25821_get_audio_data(struct cx25821_dev *dev,
 264                            struct sram_channel *sram_ch)
 265 {
 266         struct file *myfile;
 267         int frame_index_temp = dev->_audioframe_index;
 268         int i = 0;
 269         int line_size = AUDIO_LINE_SIZE;
 270         int frame_size = AUDIO_DATA_BUF_SZ;
 271         int frame_offset = frame_size * frame_index_temp;
 272         ssize_t vfs_read_retval = 0;
 273         char mybuf[line_size];
 274         loff_t file_offset = dev->_audioframe_count * frame_size;
 275         loff_t pos;
 276         mm_segment_t old_fs;
 277
 278         if (dev->_audiofile_status == END_OF_FILE)
 279                 return 0;
 280
 281         myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 282
 283         if (IS_ERR(myfile)) {
 284                 const int open_errno = -PTR_ERR(myfile);
 285                 printk("%s(): ERROR opening file(%s) with errno = %d! \n",
 286                        __func__, dev->_audiofilename, open_errno);
 287                 return PTR_ERR(myfile);
 288         } else {
 289                 if (!(myfile->f_op)) {
 290                         printk("%s: File has no file operations registered!\n",
 291                                __func__);
 292                         filp_close(myfile, NULL);
 293                         return -EIO;
 294                 }
 295
 296                 if (!myfile->f_op->read) {
 297                         printk("%s: File has no READ operations registered! \n",
 298                                __func__);
 299                         filp_close(myfile, NULL);
 300                         return -EIO;
 301                 }
 302
 303                 pos = myfile->f_pos;
 304                 old_fs = get_fs();
 305                 set_fs(KERNEL_DS);
 306
 307                 for (i = 0; i < dev->_audio_lines_count; i++) {
 308                         pos = file_offset;
 309
 310                         vfs_read_retval =
 311                             vfs_read(myfile, mybuf, line_size, &pos);
 312
 313                         if (vfs_read_retval > 0 && vfs_read_retval == line_size
 314                             && dev->_audiodata_buf_virt_addr != NULL) {
 315                                 memcpy((void *)(dev->_audiodata_buf_virt_addr +
 316                                                 frame_offset / 4), mybuf,
 317                                        vfs_read_retval);
 318                         }
 319
 320                         file_offset += vfs_read_retval;
 321                         frame_offset += vfs_read_retval;
 322
 323                         if (vfs_read_retval < line_size) {
 324                                 printk(KERN_INFO
 325                                        "Done: exit %s() since no more bytes to read from Audio file.\n",
 326                                        __func__);
 327                                 break;
 328                         }
 329                 }
 330
 331                 if (i > 0)
 332                         dev->_audioframe_count++;
 333
 334                 dev->_audiofile_status =
 335                     (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
 336
 337                 set_fs(old_fs);
 338                 filp_close(myfile, NULL);
 339         }
 340
 341         return 0;
 342 }
 343
 344 static void cx25821_audioups_handler(struct work_struct *work)
 345 {
 346         struct cx25821_dev *dev =
 347             container_of(work, struct cx25821_dev, _audio_work_entry);
 348
 349         if (!dev) {
 350                 printk("ERROR %s(): since container_of(work_struct) FAILED! \n",
 351                        __func__);
 352                 return;
 353         }
 354
 355         cx25821_get_audio_data(dev,
 356                                &dev->sram_channels[dev->
 357                                                    _audio_upstream_channel_select]);
 358 }
 359
 360 int cx25821_openfile_audio(struct cx25821_dev *dev,
 361                            struct sram_channel *sram_ch)
 362 {
 363         struct file *myfile;
 364         int i = 0, j = 0;
 365         int line_size = AUDIO_LINE_SIZE;
 366         ssize_t vfs_read_retval = 0;
 367         char mybuf[line_size];
 368         loff_t pos;
 369         loff_t offset = (unsigned long)0;
 370         mm_segment_t old_fs;
 371
 372         myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 373
 374         if (IS_ERR(myfile)) {
 375                 const int open_errno = -PTR_ERR(myfile);
 376                 printk("%s(): ERROR opening file(%s) with errno = %d! \n",
 377                        __func__, dev->_audiofilename, open_errno);
 378                 return PTR_ERR(myfile);
 379         } else {
 380                 if (!(myfile->f_op)) {
 381                         printk("%s: File has no file operations registered! \n",
 382                                __func__);
 383                         filp_close(myfile, NULL);
 384                         return -EIO;
 385                 }
 386
 387                 if (!myfile->f_op->read) {
 388                         printk("%s: File has no READ operations registered! \n",
 389                                __func__);
 390                         filp_close(myfile, NULL);
 391                         return -EIO;
 392                 }
 393
 394                 pos = myfile->f_pos;
 395                 old_fs = get_fs();
 396                 set_fs(KERNEL_DS);
 397
 398                 for (j = 0; j < NUM_AUDIO_FRAMES; j++) {
 399                         for (i = 0; i < dev->_audio_lines_count; i++) {
 400                                 pos = offset;
 401
 402                                 vfs_read_retval =
 403                                     vfs_read(myfile, mybuf, line_size, &pos);
 404
 405                                 if (vfs_read_retval > 0
 406                                     && vfs_read_retval == line_size
 407                                     && dev->_audiodata_buf_virt_addr != NULL) {
 408                                         memcpy((void *)(dev->
 409                                                         _audiodata_buf_virt_addr
 410                                                         + offset / 4), mybuf,
 411                                                vfs_read_retval);
 412                                 }
 413
 414                                 offset += vfs_read_retval;
 415
 416                                 if (vfs_read_retval < line_size) {
 417                                         printk(KERN_INFO
 418                                                "Done: exit %s() since no more bytes to read from Audio file.\n",
 419                                                __func__);
 420                                         break;
 421                                 }
 422                         }
 423
 424                         if (i > 0) {
 425                                 dev->_audioframe_count++;
 426                         }
 427
 428                         if (vfs_read_retval < line_size) {
 429                                 break;
 430                         }
 431                 }
 432
 433                 dev->_audiofile_status =
 434                     (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
 435
 436                 set_fs(old_fs);
 437                 myfile->f_pos = 0;
 438                 filp_close(myfile, NULL);
 439         }
 440
 441         return 0;
 442 }
 443
 444 static int cx25821_audio_upstream_buffer_prepare(struct cx25821_dev *dev,
 445                                                  struct sram_channel *sram_ch,
 446                                                  int bpl)
 447 {
 448         int ret = 0;
 449         dma_addr_t dma_addr;
 450         dma_addr_t data_dma_addr;
 451
 452         cx25821_free_memory_audio(dev);
 453
 454         dev->_risc_virt_addr =
 455             pci_alloc_consistent(dev->pci, dev->audio_upstream_riscbuf_size,
 456                                  &dma_addr);
 457         dev->_risc_virt_start_addr = dev->_risc_virt_addr;
 458         dev->_risc_phys_start_addr = dma_addr;
 459         dev->_risc_phys_addr = dma_addr;
 460         dev->_audiorisc_size = dev->audio_upstream_riscbuf_size;
 461
 462         if (!dev->_risc_virt_addr) {
 463                 printk
 464                     ("cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for RISC program! Returning.\n");
 465                 return -ENOMEM;
 466         }
 467         //Clear out memory at address
 468         memset(dev->_risc_virt_addr, 0, dev->_audiorisc_size);
 469
 470         //For Audio Data buffer allocation
 471         dev->_audiodata_buf_virt_addr =
 472             pci_alloc_consistent(dev->pci, dev->audio_upstream_databuf_size,
 473                                  &data_dma_addr);
 474         dev->_audiodata_buf_phys_addr = data_dma_addr;
 475         dev->_audiodata_buf_size = dev->audio_upstream_databuf_size;
 476
 477         if (!dev->_audiodata_buf_virt_addr) {
 478                 printk
 479                     ("cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for data buffer! Returning. \n");
 480                 return -ENOMEM;
 481         }
 482         //Clear out memory at address
 483         memset(dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size);
 484
 485         ret = cx25821_openfile_audio(dev, sram_ch);
 486         if (ret < 0)
 487                 return ret;
 488
 489         //Creating RISC programs
 490         ret =
 491             cx25821_risc_buffer_upstream_audio(dev, dev->pci, bpl,
 492                                                dev->_audio_lines_count);
 493         if (ret < 0) {
 494                 printk(KERN_DEBUG
 495                        "cx25821 ERROR creating audio upstream RISC programs! \n");
 496                 goto error;
 497         }
 498
 499         return 0;
 500
 501       error:
 502         return ret;
 503 }
 504
 505 int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num,
 506                                u32 status)
 507 {
 508         int i = 0;
 509         u32 int_msk_tmp;
 510         struct sram_channel *channel = &dev->sram_channels[chan_num];
 511         dma_addr_t risc_phys_jump_addr;
 512         __le32 *rp;
 513
 514         if (status & FLD_AUD_SRC_RISCI1) {
 515                 //Get interrupt_index of the program that interrupted
 516                 u32 prog_cnt = cx_read(channel->gpcnt);
 517
 518                 //Since we've identified our IRQ, clear our bits from the interrupt mask and interrupt status registers
 519                 cx_write(channel->int_msk, 0);
 520                 cx_write(channel->int_stat, cx_read(channel->int_stat));
 521
 522                 spin_lock(&dev->slock);
 523
 524                 while (prog_cnt != dev->_last_index_irq) {
 525                         //Update _last_index_irq
 526                         if (dev->_last_index_irq < (NUMBER_OF_PROGRAMS - 1)) {
 527                                 dev->_last_index_irq++;
 528                         } else {
 529                                 dev->_last_index_irq = 0;
 530                         }
 531
 532                         dev->_audioframe_index = dev->_last_index_irq;
 533
 534                         queue_work(dev->_irq_audio_queues,
 535                                    &dev->_audio_work_entry);
 536                 }
 537
 538                 if (dev->_is_first_audio_frame) {
 539                         dev->_is_first_audio_frame = 0;
 540
 541                         if (dev->_risc_virt_start_addr != NULL) {
 542                                 risc_phys_jump_addr =
 543                                     dev->_risc_phys_start_addr +
 544                                     RISC_SYNC_INSTRUCTION_SIZE +
 545                                     AUDIO_RISC_DMA_BUF_SIZE;
 546
 547                                 rp = cx25821_risc_field_upstream_audio(dev,
 548                                                                        dev->
 549                                                                        _risc_virt_start_addr
 550                                                                        + 1,
 551                                                                        dev->
 552                                                                        _audiodata_buf_phys_addr,
 553                                                                        AUDIO_LINE_SIZE,
 554                                                                        FIFO_DISABLE);
 555
 556                                 if (USE_RISC_NOOP_AUDIO) {
 557                                         for (i = 0; i < NUM_NO_OPS; i++) {
 558                                                 *(rp++) =
 559                                                     cpu_to_le32(RISC_NOOP);
 560                                         }
 561                                 }
 562                                 // Jump to 2nd Audio Frame
 563                                 *(rp++) =
 564                                     cpu_to_le32(RISC_JUMP | RISC_IRQ1 |
 565                                                 RISC_CNT_RESET);
 566                                 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
 567                                 *(rp++) = cpu_to_le32(0);
 568                         }
 569                 }
 570
 571                 spin_unlock(&dev->slock);
 572         } else {
 573                 if (status & FLD_AUD_SRC_OF)
 574                         printk("%s: Audio Received Overflow Error Interrupt!\n",
 575                                __func__);
 576
 577                 if (status & FLD_AUD_SRC_SYNC)
 578                         printk("%s: Audio Received Sync Error Interrupt!\n",
 579                                __func__);
 580
 581                 if (status & FLD_AUD_SRC_OPC_ERR)
 582                         printk("%s: Audio Received OpCode Error Interrupt!\n",
 583                                __func__);
 584
 585                 // Read and write back the interrupt status register to clear our bits
 586                 cx_write(channel->int_stat, cx_read(channel->int_stat));
 587         }
 588
 589         if (dev->_audiofile_status == END_OF_FILE) {
 590                 printk("cx25821: EOF Channel Audio Framecount = %d\n",
 591                        dev->_audioframe_count);
 592                 return -1;
 593         }
 594         //ElSE, set the interrupt mask register, re-enable irq.
 595         int_msk_tmp = cx_read(channel->int_msk);
 596         cx_write(channel->int_msk, int_msk_tmp |= _intr_msk);
 597
 598         return 0;
 599 }
 600
 601 static irqreturn_t cx25821_upstream_irq_audio(int irq, void *dev_id)
 602 {
 603         struct cx25821_dev *dev = dev_id;
 604         u32 msk_stat, audio_status;
 605         int handled = 0;
 606         struct sram_channel *sram_ch;
 607
 608         if (!dev)
 609                 return -1;
 610
 611         sram_ch = &dev->sram_channels[dev->_audio_upstream_channel_select];
 612
 613         msk_stat = cx_read(sram_ch->int_mstat);
 614         audio_status = cx_read(sram_ch->int_stat);
 615
 616         // Only deal with our interrupt
 617         if (audio_status) {
 618                 handled =
 619                     cx25821_audio_upstream_irq(dev,
 620                                                dev->
 621                                                _audio_upstream_channel_select,
 622                                                audio_status);
 623         }
 624
 625         if (handled < 0) {
 626                 cx25821_stop_upstream_audio(dev);
 627         } else {
 628                 handled += handled;
 629         }
 630
 631         return IRQ_RETVAL(handled);
 632 }
 633
 634 static void cx25821_wait_fifo_enable(struct cx25821_dev *dev,
 635                                      struct sram_channel *sram_ch)
 636 {
 637         int count = 0;
 638         u32 tmp;
 639
 640         do {
 641                 //Wait 10 microsecond before checking to see if the FIFO is turned ON.
 642                 udelay(10);
 643
 644                 tmp = cx_read(sram_ch->dma_ctl);
 645
 646                 if (count++ > 1000)     //10 millisecond timeout
 647                 {
 648                         printk
 649                             ("cx25821 ERROR: %s() fifo is NOT turned on. Timeout!\n",
 650                              __func__);
 651                         return;
 652                 }
 653
 654         } while (!(tmp & sram_ch->fld_aud_fifo_en));
 655
 656 }
 657
 658 int cx25821_start_audio_dma_upstream(struct cx25821_dev *dev,
 659                                      struct sram_channel *sram_ch)
 660 {
 661         u32 tmp = 0;
 662         int err = 0;
 663
 664         // Set the physical start address of the RISC program in the initial program counter(IPC) member of the CMDS.
 665         cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
 666         cx_write(sram_ch->cmds_start + 4, 0);   /* Risc IPC High 64 bits 63-32 */
 667
 668         /* reset counter */
 669         cx_write(sram_ch->gpcnt_ctl, 3);
 670
 671         //Set the line length       (It looks like we do not need to set the line length)
 672         cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);
 673
 674         //Set the input mode to 16-bit
 675         tmp = cx_read(sram_ch->aud_cfg);
 676         tmp |=
 677             FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE |
 678             FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D | FLD_AUD_SONY_MODE;
 679         cx_write(sram_ch->aud_cfg, tmp);
 680
 681         // Read and write back the interrupt status register to clear it
 682         tmp = cx_read(sram_ch->int_stat);
 683         cx_write(sram_ch->int_stat, tmp);
 684
 685         // Clear our bits from the interrupt status register.
 686         cx_write(sram_ch->int_stat, _intr_msk);
 687
 688         //Set the interrupt mask register, enable irq.
 689         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
 690         tmp = cx_read(sram_ch->int_msk);
 691         cx_write(sram_ch->int_msk, tmp |= _intr_msk);
 692
 693         err =
 694             request_irq(dev->pci->irq, cx25821_upstream_irq_audio,
 695                         IRQF_SHARED | IRQF_DISABLED, dev->name, dev);
 696         if (err < 0) {
 697                 printk(KERN_ERR "%s: can't get upstream IRQ %d\n", dev->name,
 698                        dev->pci->irq);
 699                 goto fail_irq;
 700         }
 701
 702         // Start the DMA  engine
 703         tmp = cx_read(sram_ch->dma_ctl);
 704         cx_set(sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en);
 705
 706         dev->_audio_is_running = 1;
 707         dev->_is_first_audio_frame = 1;
 708
 709         // The fifo_en bit turns on by the first Risc program
 710         cx25821_wait_fifo_enable(dev, sram_ch);
 711
 712         return 0;
 713
 714       fail_irq:
 715         cx25821_dev_unregister(dev);
 716         return err;
 717 }
 718
 719 int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
 720 {
 721         struct sram_channel *sram_ch;
 722         int retval = 0;
 723         int err = 0;
 724         int str_length = 0;
 725
 726         if (dev->_audio_is_running) {
 727                 printk("Audio Channel is still running so return!\n");
 728                 return 0;
 729         }
 730
 731         dev->_audio_upstream_channel_select = channel_select;
 732         sram_ch = &dev->sram_channels[channel_select];
 733
 734         //Work queue
 735         INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
 736         dev->_irq_audio_queues =
 737             create_singlethread_workqueue("cx25821_audioworkqueue");
 738
 739         if (!dev->_irq_audio_queues) {
 740                 printk
 741                     ("cx25821 ERROR: create_singlethread_workqueue() for Audio FAILED!\n");
 742                 return -ENOMEM;
 743         }
 744
 745         dev->_last_index_irq = 0;
 746         dev->_audio_is_running = 0;
 747         dev->_audioframe_count = 0;
 748         dev->_audiofile_status = RESET_STATUS;
 749         dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
 750         _line_size = AUDIO_LINE_SIZE;
 751
 752         if (dev->input_audiofilename) {
 753                 str_length = strlen(dev->input_audiofilename);
 754                 dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL);
 755
 756                 if (!dev->_audiofilename)
 757                         goto error;
 758
 759                 memcpy(dev->_audiofilename, dev->input_audiofilename,
 760                        str_length + 1);
 761
 762                 //Default if filename is empty string
 763                 if (strcmp(dev->input_audiofilename, "") == 0) {
 764                         dev->_audiofilename = "/root/audioGOOD.wav";
 765                 }
 766         } else {
 767                 str_length = strlen(_defaultAudioName);
 768                 dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL);
 769
 770                 if (!dev->_audiofilename)
 771                         goto error;
 772
 773                 memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1);
 774         }
 775
 776         retval =
 777             cx25821_sram_channel_setup_upstream_audio(dev, sram_ch, _line_size,
 778                                                       0);
 779
 780         dev->audio_upstream_riscbuf_size =
 781             AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS +
 782             RISC_SYNC_INSTRUCTION_SIZE;
 783         dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;
 784
 785         //Allocating buffers and prepare RISC program
 786         retval =
 787             cx25821_audio_upstream_buffer_prepare(dev, sram_ch, _line_size);
 788         if (retval < 0) {
 789                 printk(KERN_ERR
 790                        "%s: Failed to set up Audio upstream buffers!\n",
 791                        dev->name);
 792                 goto error;
 793         }
 794         //Start RISC engine
 795         cx25821_start_audio_dma_upstream(dev, sram_ch);
 796
 797         return 0;
 798
 799       error:
 800         cx25821_dev_unregister(dev);
 801
 802         return err;
 803 }