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 = FLD_AUD_SRC_RISCI1 | FLD_AUD_SRC_OF |
  43                         FLD_AUD_SRC_SYNC | FLD_AUD_SRC_OPC_ERR;
  44
  45 int cx25821_sram_channel_setup_upstream_audio(struct cx25821_dev *dev,
  46                                               struct sram_channel *ch,
  47                                               unsigned int bpl, u32 risc)
  48 {
  49         unsigned int i, lines;
  50         u32 cdt;
  51
  52         if (ch->cmds_start == 0) {
  53                 cx_write(ch->ptr1_reg, 0);
  54                 cx_write(ch->ptr2_reg, 0);
  55                 cx_write(ch->cnt2_reg, 0);
  56                 cx_write(ch->cnt1_reg, 0);
  57                 return 0;
  58         }
  59
  60         bpl = (bpl + 7) & ~7;   /* alignment */
  61         cdt = ch->cdt;
  62         lines = ch->fifo_size / bpl;
  63
  64         if (lines > 3)
  65                 lines = 3;
  66
  67         BUG_ON(lines < 2);
  68
  69         /* write CDT */
  70         for (i = 0; i < lines; i++) {
  71                 cx_write(cdt + 16 * i, ch->fifo_start + bpl * i);
  72                 cx_write(cdt + 16 * i + 4, 0);
  73                 cx_write(cdt + 16 * i + 8, 0);
  74                 cx_write(cdt + 16 * i + 12, 0);
  75         }
  76
  77         /* write CMDS */
  78         cx_write(ch->cmds_start + 0, risc);
  79
  80         cx_write(ch->cmds_start + 4, 0);
  81         cx_write(ch->cmds_start + 8, cdt);
  82         cx_write(ch->cmds_start + 12, AUDIO_CDT_SIZE_QW);
  83         cx_write(ch->cmds_start + 16, ch->ctrl_start);
  84
  85         /* IQ size */
  86         cx_write(ch->cmds_start + 20, AUDIO_IQ_SIZE_DW);
  87
  88         for (i = 24; i < 80; i += 4)
  89                 cx_write(ch->cmds_start + i, 0);
  90
  91         /* fill registers */
  92         cx_write(ch->ptr1_reg, ch->fifo_start);
  93         cx_write(ch->ptr2_reg, cdt);
  94         cx_write(ch->cnt2_reg, AUDIO_CDT_SIZE_QW);
  95         cx_write(ch->cnt1_reg, AUDIO_CLUSTER_SIZE_QW - 1);
  96
  97         return 0;
  98 }
  99
 100 static __le32 *cx25821_risc_field_upstream_audio(struct cx25821_dev *dev,
 101                                                  __le32 *rp,
 102                                                  dma_addr_t databuf_phys_addr,
 103                                                  unsigned int bpl,
 104                                                  int fifo_enable)
 105 {
 106         unsigned int line;
 107         struct sram_channel *sram_ch =
 108            dev->channels[dev->_audio_upstream_channel_select].sram_channels;
 109         int offset = 0;
 110
 111         /* scan lines */
 112         for (line = 0; line < LINES_PER_AUDIO_BUFFER; line++) {
 113                 *(rp++) = cpu_to_le32(RISC_READ | RISC_SOL | RISC_EOL | bpl);
 114                 *(rp++) = cpu_to_le32(databuf_phys_addr + offset);
 115                 *(rp++) = cpu_to_le32(0);       /* bits 63-32 */
 116
 117                 /* Check if we need to enable the FIFO
 118                  * after the first 3 lines.
 119                  * For the upstream audio channel,
 120                  * 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                 /* Loop to (Nth)FrameRISC or to Start of Risc program &
 187                  * 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->channels[AUDIO_UPSTREAM_SRAM_CHANNEL_B].sram_channels;
 220         u32 tmp = 0;
 221
 222         if (!dev->_audio_is_running) {
 223                 printk(KERN_DEBUG
 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         cx25821_free_memory_audio(dev);
 260 }
 261
 262 int cx25821_get_audio_data(struct cx25821_dev *dev,
 263                            struct sram_channel *sram_ch)
 264 {
 265         struct file *myfile;
 266         int frame_index_temp = dev->_audioframe_index;
 267         int i = 0;
 268         int line_size = AUDIO_LINE_SIZE;
 269         int frame_size = AUDIO_DATA_BUF_SZ;
 270         int frame_offset = frame_size * frame_index_temp;
 271         ssize_t vfs_read_retval = 0;
 272         char mybuf[line_size];
 273         loff_t file_offset = dev->_audioframe_count * frame_size;
 274         loff_t pos;
 275         mm_segment_t old_fs;
 276
 277         if (dev->_audiofile_status == END_OF_FILE)
 278                 return 0;
 279
 280         myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 281
 282         if (IS_ERR(myfile)) {
 283                 const int open_errno = -PTR_ERR(myfile);
 284                 printk(KERN_ERR "%s(): ERROR opening file(%s) with errno = %d!\n",
 285                        __func__, dev->_audiofilename, open_errno);
 286                 return PTR_ERR(myfile);
 287         } else {
 288                 if (!(myfile->f_op)) {
 289                         printk(KERN_ERR "%s: File has no file operations registered!\n",
 290                                __func__);
 291                         filp_close(myfile, NULL);
 292                         return -EIO;
 293                 }
 294
 295                 if (!myfile->f_op->read) {
 296                         printk(KERN_ERR "%s: File has no READ operations registered!\n",
 297                                __func__);
 298                         filp_close(myfile, NULL);
 299                         return -EIO;
 300                 }
 301
 302                 pos = myfile->f_pos;
 303                 old_fs = get_fs();
 304                 set_fs(KERNEL_DS);
 305
 306                 for (i = 0; i < dev->_audio_lines_count; i++) {
 307                         pos = file_offset;
 308
 309                         vfs_read_retval =
 310                             vfs_read(myfile, mybuf, line_size, &pos);
 311
 312                         if (vfs_read_retval > 0 && vfs_read_retval == line_size
 313                             && dev->_audiodata_buf_virt_addr != NULL) {
 314                                 memcpy((void *)(dev->_audiodata_buf_virt_addr +
 315                                                 frame_offset / 4), mybuf,
 316                                        vfs_read_retval);
 317                         }
 318
 319                         file_offset += vfs_read_retval;
 320                         frame_offset += vfs_read_retval;
 321
 322                         if (vfs_read_retval < line_size) {
 323                                 printk(KERN_INFO
 324                                        "Done: exit %s() since no more bytes to read from Audio file.\n",
 325                                        __func__);
 326                                 break;
 327                         }
 328                 }
 329
 330                 if (i > 0)
 331                         dev->_audioframe_count++;
 332
 333                 dev->_audiofile_status =
 334                     (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
 335
 336                 set_fs(old_fs);
 337                 filp_close(myfile, NULL);
 338         }
 339
 340         return 0;
 341 }
 342
 343 static void cx25821_audioups_handler(struct work_struct *work)
 344 {
 345         struct cx25821_dev *dev =
 346             container_of(work, struct cx25821_dev, _audio_work_entry);
 347
 348         if (!dev) {
 349                 printk(KERN_ERR "ERROR %s(): since container_of(work_struct) FAILED!\n",
 350                        __func__);
 351                 return;
 352         }
 353
 354         cx25821_get_audio_data(dev,
 355                               dev->channels[dev->
 356                                        _audio_upstream_channel_select].
 357                                        sram_channels);
 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(KERN_ERR "%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(KERN_ERR "%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->channels[chan_num].sram_channels;
 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(KERN_WARNING "%s: Audio Received Overflow Error Interrupt!\n",
 573                                __func__);
 574
 575                 if (status & FLD_AUD_SRC_SYNC)
 576                         printk(KERN_WARNING "%s: Audio Received Sync Error Interrupt!\n",
 577                                __func__);
 578
 579                 if (status & FLD_AUD_SRC_OPC_ERR)
 580                         printk(KERN_WARNING "%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(KERN_WARNING "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->channels[dev->_audio_upstream_channel_select].sram_channels;
 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(KERN_ERR
 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(KERN_WARNING "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->channels[channel_select].sram_channels;
 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         } else {
 768                 str_length = strlen(_defaultAudioName);
 769                 dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL);
 770
 771                 if (!dev->_audiofilename)
 772                         goto error;
 773
 774                 memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1);
 775         }
 776
 777         retval =
 778             cx25821_sram_channel_setup_upstream_audio(dev, sram_ch, _line_size,
 779                                                       0);
 780
 781         dev->audio_upstream_riscbuf_size =
 782             AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS +
 783             RISC_SYNC_INSTRUCTION_SIZE;
 784         dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;
 785
 786         /* Allocating buffers and prepare RISC program */
 787         retval =
 788             cx25821_audio_upstream_buffer_prepare(dev, sram_ch, _line_size);
 789         if (retval < 0) {
 790                 printk(KERN_ERR
 791                        "%s: Failed to set up Audio upstream buffers!\n",
 792                        dev->name);
 793                 goto error;
 794         }
 795         /* Start RISC engine */
 796         cx25821_start_audio_dma_upstream(dev, sram_ch);
 797
 798         return 0;
 799
 800 error:
 801         cx25821_dev_unregister(dev);
 802
 803         return err;
 804 }