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 <linux/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         BUG_ON(lines < 2);
  69
  70         /* write CDT */
  71         for (i = 0; i < lines; i++) {
  72                 cx_write(cdt + 16 * i, ch->fifo_start + bpl * i);
  73                 cx_write(cdt + 16 * i + 4, 0);
  74                 cx_write(cdt + 16 * i + 8, 0);
  75                 cx_write(cdt + 16 * i + 12, 0);
  76         }
  77
  78         /* write CMDS */
  79         cx_write(ch->cmds_start + 0, risc);
  80
  81         cx_write(ch->cmds_start + 4, 0);
  82         cx_write(ch->cmds_start + 8, cdt);
  83         cx_write(ch->cmds_start + 12, AUDIO_CDT_SIZE_QW);
  84         cx_write(ch->cmds_start + 16, ch->ctrl_start);
  85
  86         /* IQ size */
  87         cx_write(ch->cmds_start + 20, AUDIO_IQ_SIZE_DW);
  88
  89         for (i = 24; i < 80; i += 4)
  90                 cx_write(ch->cmds_start + i, 0);
  91
  92         /* fill registers */
  93         cx_write(ch->ptr1_reg, ch->fifo_start);
  94         cx_write(ch->ptr2_reg, cdt);
  95         cx_write(ch->cnt2_reg, AUDIO_CDT_SIZE_QW);
  96         cx_write(ch->cnt1_reg, AUDIO_CLUSTER_SIZE_QW - 1);
  97
  98         return 0;
  99 }
 100
 101 static __le32 *cx25821_risc_field_upstream_audio(struct cx25821_dev *dev,
 102                                                  __le32 *rp,
 103                                                  dma_addr_t databuf_phys_addr,
 104                                                  unsigned int bpl,
 105                                                  int fifo_enable)
 106 {
 107         unsigned int line;
 108         struct sram_channel *sram_ch =
 109             &dev->sram_channels[dev->_audio_upstream_channel_select];
 110         int offset = 0;
 111
 112         /* scan lines */
 113         for (line = 0; line < LINES_PER_AUDIO_BUFFER; line++) {
 114                 *(rp++) = cpu_to_le32(RISC_READ | RISC_SOL | RISC_EOL | bpl);
 115                 *(rp++) = cpu_to_le32(databuf_phys_addr + offset);
 116                 *(rp++) = cpu_to_le32(0);       /* bits 63-32 */
 117
 118                 /* Check if we need to enable the FIFO
 119                  * after the first 3 lines.
 120                  * For the upstream audio channel,
 121                  * the risc engine will enable the FIFO */
 122                 if (fifo_enable && line == 2) {
 123                         *(rp++) = RISC_WRITECR;
 124                         *(rp++) = sram_ch->dma_ctl;
 125                         *(rp++) = sram_ch->fld_aud_fifo_en;
 126                         *(rp++) = 0x00000020;
 127                 }
 128
 129                 offset += AUDIO_LINE_SIZE;
 130         }
 131
 132         return rp;
 133 }
 134
 135 int cx25821_risc_buffer_upstream_audio(struct cx25821_dev *dev,
 136                                        struct pci_dev *pci,
 137                                        unsigned int bpl, unsigned int lines)
 138 {
 139         __le32 *rp;
 140         int fifo_enable = 0;
 141         int frame = 0, i = 0;
 142         int frame_size = AUDIO_DATA_BUF_SZ;
 143         int databuf_offset = 0;
 144         int risc_flag = RISC_CNT_INC;
 145         dma_addr_t risc_phys_jump_addr;
 146
 147         /* Virtual address of Risc buffer program */
 148         rp = dev->_risc_virt_addr;
 149
 150         /* sync instruction */
 151         *(rp++) = cpu_to_le32(RISC_RESYNC | AUDIO_SYNC_LINE);
 152
 153         for (frame = 0; frame < NUM_AUDIO_FRAMES; frame++) {
 154                 databuf_offset = frame_size * frame;
 155
 156                 if (frame == 0) {
 157                         fifo_enable = 1;
 158                         risc_flag = RISC_CNT_RESET;
 159                 } else {
 160                         fifo_enable = 0;
 161                         risc_flag = RISC_CNT_INC;
 162                 }
 163
 164                 /* Calculate physical jump address */
 165                 if ((frame + 1) == NUM_AUDIO_FRAMES) {
 166                         risc_phys_jump_addr =
 167                             dev->_risc_phys_start_addr +
 168                             RISC_SYNC_INSTRUCTION_SIZE;
 169                 } else {
 170                         risc_phys_jump_addr =
 171                             dev->_risc_phys_start_addr +
 172                             RISC_SYNC_INSTRUCTION_SIZE +
 173                             AUDIO_RISC_DMA_BUF_SIZE * (frame + 1);
 174                 }
 175
 176                 rp = cx25821_risc_field_upstream_audio(dev, rp,
 177                                                        dev->
 178                                                        _audiodata_buf_phys_addr
 179                                                        + databuf_offset, bpl,
 180                                                        fifo_enable);
 181
 182                 if (USE_RISC_NOOP_AUDIO) {
 183                         for (i = 0; i < NUM_NO_OPS; i++)
 184                                 *(rp++) = cpu_to_le32(RISC_NOOP);
 185                 }
 186
 187                 /* Loop to (Nth)FrameRISC or to Start of Risc program &
 188                  * generate IRQ */
 189                 *(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | risc_flag);
 190                 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
 191                 *(rp++) = cpu_to_le32(0);
 192
 193                 /* Recalculate virtual address based on frame index */
 194                 rp = dev->_risc_virt_addr + RISC_SYNC_INSTRUCTION_SIZE / 4 +
 195                     (AUDIO_RISC_DMA_BUF_SIZE * (frame + 1) / 4);
 196         }
 197
 198         return 0;
 199 }
 200
 201 void cx25821_free_memory_audio(struct cx25821_dev *dev)
 202 {
 203         if (dev->_risc_virt_addr) {
 204                 pci_free_consistent(dev->pci, dev->_audiorisc_size,
 205                                     dev->_risc_virt_addr, dev->_risc_phys_addr);
 206                 dev->_risc_virt_addr = NULL;
 207         }
 208
 209         if (dev->_audiodata_buf_virt_addr) {
 210                 pci_free_consistent(dev->pci, dev->_audiodata_buf_size,
 211                                     dev->_audiodata_buf_virt_addr,
 212                                     dev->_audiodata_buf_phys_addr);
 213                 dev->_audiodata_buf_virt_addr = NULL;
 214         }
 215 }
 216
 217 void cx25821_stop_upstream_audio(struct cx25821_dev *dev)
 218 {
 219         struct sram_channel *sram_ch =
 220             &dev->sram_channels[AUDIO_UPSTREAM_SRAM_CHANNEL_B];
 221         u32 tmp = 0;
 222
 223         if (!dev->_audio_is_running) {
 224                 printk(KERN_DEBUG
 225                     "cx25821: No audio file is currently running so return!\n");
 226                 return;
 227         }
 228         /* Disable RISC interrupts */
 229         cx_write(sram_ch->int_msk, 0);
 230
 231         /* Turn OFF risc and fifo enable in AUD_DMA_CNTRL */
 232         tmp = cx_read(sram_ch->dma_ctl);
 233         cx_write(sram_ch->dma_ctl,
 234                  tmp & ~(sram_ch->fld_aud_fifo_en | sram_ch->fld_aud_risc_en));
 235
 236         /* Clear data buffer memory */
 237         if (dev->_audiodata_buf_virt_addr)
 238                 memset(dev->_audiodata_buf_virt_addr, 0,
 239                        dev->_audiodata_buf_size);
 240
 241         dev->_audio_is_running = 0;
 242         dev->_is_first_audio_frame = 0;
 243         dev->_audioframe_count = 0;
 244         dev->_audiofile_status = END_OF_FILE;
 245
 246         if (dev->_irq_audio_queues) {
 247                 kfree(dev->_irq_audio_queues);
 248                 dev->_irq_audio_queues = NULL;
 249         }
 250
 251         if (dev->_audiofilename != NULL)
 252                 kfree(dev->_audiofilename);
 253 }
 254
 255 void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
 256 {
 257         if (dev->_audio_is_running)
 258                 cx25821_stop_upstream_audio(dev);
 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(KERN_ERR "%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(KERN_ERR "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(KERN_ERR "%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                         if (vfs_read_retval < line_size)
 428                                 break;
 429                 }
 430
 431                 dev->_audiofile_status =
 432                     (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
 433
 434                 set_fs(old_fs);
 435                 myfile->f_pos = 0;
 436                 filp_close(myfile, NULL);
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int cx25821_audio_upstream_buffer_prepare(struct cx25821_dev *dev,
 443                                                  struct sram_channel *sram_ch,
 444                                                  int bpl)
 445 {
 446         int ret = 0;
 447         dma_addr_t dma_addr;
 448         dma_addr_t data_dma_addr;
 449
 450         cx25821_free_memory_audio(dev);
 451
 452         dev->_risc_virt_addr =
 453             pci_alloc_consistent(dev->pci, dev->audio_upstream_riscbuf_size,
 454                                  &dma_addr);
 455         dev->_risc_virt_start_addr = dev->_risc_virt_addr;
 456         dev->_risc_phys_start_addr = dma_addr;
 457         dev->_risc_phys_addr = dma_addr;
 458         dev->_audiorisc_size = dev->audio_upstream_riscbuf_size;
 459
 460         if (!dev->_risc_virt_addr) {
 461                 printk(KERN_DEBUG
 462                         "cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for RISC program! Returning.\n");
 463                 return -ENOMEM;
 464         }
 465         /* Clear out memory at address */
 466         memset(dev->_risc_virt_addr, 0, dev->_audiorisc_size);
 467
 468         /* For Audio Data buffer allocation */
 469         dev->_audiodata_buf_virt_addr =
 470             pci_alloc_consistent(dev->pci, dev->audio_upstream_databuf_size,
 471                                  &data_dma_addr);
 472         dev->_audiodata_buf_phys_addr = data_dma_addr;
 473         dev->_audiodata_buf_size = dev->audio_upstream_databuf_size;
 474
 475         if (!dev->_audiodata_buf_virt_addr) {
 476                 printk(KERN_DEBUG
 477                         "cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for data buffer! Returning.\n");
 478                 return -ENOMEM;
 479         }
 480         /* Clear out memory at address */
 481         memset(dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size);
 482
 483         ret = cx25821_openfile_audio(dev, sram_ch);
 484         if (ret < 0)
 485                 return ret;
 486
 487         /* Creating RISC programs */
 488         ret =
 489             cx25821_risc_buffer_upstream_audio(dev, dev->pci, bpl,
 490                                                dev->_audio_lines_count);
 491         if (ret < 0) {
 492                 printk(KERN_DEBUG
 493                       "cx25821 ERROR creating audio upstream RISC programs!\n");
 494                 goto error;
 495         }
 496
 497         return 0;
 498
 499 error:
 500         return ret;
 501 }
 502
 503 int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num,
 504                                u32 status)
 505 {
 506         int i = 0;
 507         u32 int_msk_tmp;
 508         struct sram_channel *channel = &dev->sram_channels[chan_num];
 509         dma_addr_t risc_phys_jump_addr;
 510         __le32 *rp;
 511
 512         if (status & FLD_AUD_SRC_RISCI1) {
 513                 /* Get interrupt_index of the program that interrupted */
 514                 u32 prog_cnt = cx_read(channel->gpcnt);
 515
 516                 /* Since we've identified our IRQ, clear our bits from the
 517                  * interrupt mask and interrupt status registers */
 518                 cx_write(channel->int_msk, 0);
 519                 cx_write(channel->int_stat, cx_read(channel->int_stat));
 520
 521                 spin_lock(&dev->slock);
 522
 523                 while (prog_cnt != dev->_last_index_irq) {
 524                         /* Update _last_index_irq */
 525                         if (dev->_last_index_irq < (NUMBER_OF_PROGRAMS - 1))
 526                                 dev->_last_index_irq++;
 527                         else
 528                                 dev->_last_index_irq = 0;
 529
 530                         dev->_audioframe_index = dev->_last_index_irq;
 531
 532                         queue_work(dev->_irq_audio_queues,
 533                                    &dev->_audio_work_entry);
 534                 }
 535
 536                 if (dev->_is_first_audio_frame) {
 537                         dev->_is_first_audio_frame = 0;
 538
 539                         if (dev->_risc_virt_start_addr != NULL) {
 540                                 risc_phys_jump_addr =
 541                                     dev->_risc_phys_start_addr +
 542                                     RISC_SYNC_INSTRUCTION_SIZE +
 543                                     AUDIO_RISC_DMA_BUF_SIZE;
 544
 545                                 rp = cx25821_risc_field_upstream_audio(dev,
 546                                                                        dev->
 547                                                                        _risc_virt_start_addr
 548                                                                        + 1,
 549                                                                        dev->
 550                                                                        _audiodata_buf_phys_addr,
 551                                                                        AUDIO_LINE_SIZE,
 552                                                                        FIFO_DISABLE);
 553
 554                                 if (USE_RISC_NOOP_AUDIO) {
 555                                         for (i = 0; i < NUM_NO_OPS; i++) {
 556                                                 *(rp++) =
 557                                                     cpu_to_le32(RISC_NOOP);
 558                                         }
 559                                 }
 560                                 /* Jump to 2nd Audio Frame */
 561                                 *(rp++) =
 562                                     cpu_to_le32(RISC_JUMP | RISC_IRQ1 |
 563                                                 RISC_CNT_RESET);
 564                                 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
 565                                 *(rp++) = cpu_to_le32(0);
 566                         }
 567                 }
 568
 569                 spin_unlock(&dev->slock);
 570         } else {
 571                 if (status & FLD_AUD_SRC_OF)
 572                         printk("%s: Audio Received Overflow Error Interrupt!\n",
 573                                __func__);
 574
 575                 if (status & FLD_AUD_SRC_SYNC)
 576                         printk("%s: Audio Received Sync Error Interrupt!\n",
 577                                __func__);
 578
 579                 if (status & FLD_AUD_SRC_OPC_ERR)
 580                         printk("%s: Audio Received OpCode Error Interrupt!\n",
 581                                __func__);
 582
 583                 /* Read and write back the interrupt status register to clear
 584                  * our bits */
 585                 cx_write(channel->int_stat, cx_read(channel->int_stat));
 586         }
 587
 588         if (dev->_audiofile_status == END_OF_FILE) {
 589                 printk("cx25821: EOF Channel Audio Framecount = %d\n",
 590                        dev->_audioframe_count);
 591                 return -1;
 592         }
 593         /* ElSE, set the interrupt mask register, re-enable irq. */
 594         int_msk_tmp = cx_read(channel->int_msk);
 595         cx_write(channel->int_msk, int_msk_tmp |= _intr_msk);
 596
 597         return 0;
 598 }
 599
 600 static irqreturn_t cx25821_upstream_irq_audio(int irq, void *dev_id)
 601 {
 602         struct cx25821_dev *dev = dev_id;
 603         u32 msk_stat, audio_status;
 604         int handled = 0;
 605         struct sram_channel *sram_ch;
 606
 607         if (!dev)
 608                 return -1;
 609
 610         sram_ch = &dev->sram_channels[dev->_audio_upstream_channel_select];
 611
 612         msk_stat = cx_read(sram_ch->int_mstat);
 613         audio_status = cx_read(sram_ch->int_stat);
 614
 615         /* Only deal with our interrupt */
 616         if (audio_status) {
 617                 handled =
 618                     cx25821_audio_upstream_irq(dev,
 619                                                dev->
 620                                                _audio_upstream_channel_select,
 621                                                audio_status);
 622         }
 623
 624         if (handled < 0)
 625                 cx25821_stop_upstream_audio(dev);
 626         else
 627                 handled += handled;
 628
 629         return IRQ_RETVAL(handled);
 630 }
 631
 632 static void cx25821_wait_fifo_enable(struct cx25821_dev *dev,
 633                                      struct sram_channel *sram_ch)
 634 {
 635         int count = 0;
 636         u32 tmp;
 637
 638         do {
 639                 /* Wait 10 microsecond before checking to see if the FIFO is
 640                  * turned ON. */
 641                 udelay(10);
 642
 643                 tmp = cx_read(sram_ch->dma_ctl);
 644
 645                 /* 10 millisecond timeout */
 646                 if (count++ > 1000) {
 647                         printk
 648                             ("cx25821 ERROR: %s() fifo is NOT turned on. Timeout!\n",
 649                              __func__);
 650                         return;
 651                 }
 652
 653         } while (!(tmp & sram_ch->fld_aud_fifo_en));
 654
 655 }
 656
 657 int cx25821_start_audio_dma_upstream(struct cx25821_dev *dev,
 658                                      struct sram_channel *sram_ch)
 659 {
 660         u32 tmp = 0;
 661         int err = 0;
 662
 663         /* Set the physical start address of the RISC program in the initial
 664          * program counter(IPC) member of the CMDS. */
 665         cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
 666         /* Risc IPC High 64 bits 63-32 */
 667         cx_write(sram_ch->cmds_start + 4, 0);
 668
 669         /* reset counter */
 670         cx_write(sram_ch->gpcnt_ctl, 3);
 671
 672         /* Set the line length       (It looks like we do not need to set the
 673          * line length) */
 674         cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);
 675
 676         /* Set the input mode to 16-bit */
 677         tmp = cx_read(sram_ch->aud_cfg);
 678         tmp |=
 679             FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE |
 680             FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D | FLD_AUD_SONY_MODE;
 681         cx_write(sram_ch->aud_cfg, tmp);
 682
 683         /* Read and write back the interrupt status register to clear it */
 684         tmp = cx_read(sram_ch->int_stat);
 685         cx_write(sram_ch->int_stat, tmp);
 686
 687         /* Clear our bits from the interrupt status register. */
 688         cx_write(sram_ch->int_stat, _intr_msk);
 689
 690         /* Set the interrupt mask register, enable irq. */
 691         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
 692         tmp = cx_read(sram_ch->int_msk);
 693         cx_write(sram_ch->int_msk, tmp |= _intr_msk);
 694
 695         err =
 696             request_irq(dev->pci->irq, cx25821_upstream_irq_audio,
 697                         IRQF_SHARED | IRQF_DISABLED, dev->name, dev);
 698         if (err < 0) {
 699                 printk(KERN_ERR "%s: can't get upstream IRQ %d\n", dev->name,
 700                        dev->pci->irq);
 701                 goto fail_irq;
 702         }
 703
 704         /* Start the DMA  engine */
 705         tmp = cx_read(sram_ch->dma_ctl);
 706         cx_set(sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en);
 707
 708         dev->_audio_is_running = 1;
 709         dev->_is_first_audio_frame = 1;
 710
 711         /* The fifo_en bit turns on by the first Risc program */
 712         cx25821_wait_fifo_enable(dev, sram_ch);
 713
 714         return 0;
 715
 716 fail_irq:
 717         cx25821_dev_unregister(dev);
 718         return err;
 719 }
 720
 721 int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
 722 {
 723         struct sram_channel *sram_ch;
 724         int retval = 0;
 725         int err = 0;
 726         int str_length = 0;
 727
 728         if (dev->_audio_is_running) {
 729                 printk("Audio Channel is still running so return!\n");
 730                 return 0;
 731         }
 732
 733         dev->_audio_upstream_channel_select = channel_select;
 734         sram_ch = &dev->sram_channels[channel_select];
 735
 736         /* Work queue */
 737         INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
 738         dev->_irq_audio_queues =
 739             create_singlethread_workqueue("cx25821_audioworkqueue");
 740
 741         if (!dev->_irq_audio_queues) {
 742                 printk(KERN_DEBUG
 743                         "cx25821 ERROR: create_singlethread_workqueue() for Audio FAILED!\n");
 744                 return -ENOMEM;
 745         }
 746
 747         dev->_last_index_irq = 0;
 748         dev->_audio_is_running = 0;
 749         dev->_audioframe_count = 0;
 750         dev->_audiofile_status = RESET_STATUS;
 751         dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
 752         _line_size = AUDIO_LINE_SIZE;
 753
 754         if (dev->input_audiofilename) {
 755                 str_length = strlen(dev->input_audiofilename);
 756                 dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL);
 757
 758                 if (!dev->_audiofilename)
 759                         goto error;
 760
 761                 memcpy(dev->_audiofilename, dev->input_audiofilename,
 762                        str_length + 1);
 763
 764                 /* Default if filename is empty string */
 765                 if (strcmp(dev->input_audiofilename, "") == 0) {
 766                         dev->_audiofilename = "/root/audioGOOD.wav";
 767                 }
 768         } else {
 769                 str_length = strlen(_defaultAudioName);
 770                 dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL);
 771
 772                 if (!dev->_audiofilename)
 773                         goto error;
 774
 775                 memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1);
 776         }
 777
 778         retval =
 779             cx25821_sram_channel_setup_upstream_audio(dev, sram_ch, _line_size,
 780                                                       0);
 781
 782         dev->audio_upstream_riscbuf_size =
 783             AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS +
 784             RISC_SYNC_INSTRUCTION_SIZE;
 785         dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;
 786
 787         /* Allocating buffers and prepare RISC program */
 788         retval =
 789             cx25821_audio_upstream_buffer_prepare(dev, sram_ch, _line_size);
 790         if (retval < 0) {
 791                 printk(KERN_ERR
 792                        "%s: Failed to set up Audio upstream buffers!\n",
 793                        dev->name);
 794                 goto error;
 795         }
 796         /* Start RISC engine */
 797         cx25821_start_audio_dma_upstream(dev, sram_ch);
 798
 799         return 0;
 800
 801 error:
 802         cx25821_dev_unregister(dev);
 803
 804         return err;
 805 }