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 <asm/uaccess.h>
  36
  37 MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
  38 MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");
  39 MODULE_LICENSE("GPL");
  40
  41 static int _intr_msk =
  42     FLD_AUD_SRC_RISCI1 | FLD_AUD_SRC_OF | FLD_AUD_SRC_SYNC |
  43     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
  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 after the first 3 lines
 119                 // For the upstream audio channel, the risc engine will enable the FIFO.
 120                 if (fifo_enable && line == 2) {
 121                         *(rp++) = RISC_WRITECR;
 122                         *(rp++) = sram_ch->dma_ctl;
 123                         *(rp++) = sram_ch->fld_aud_fifo_en;
 124                         *(rp++) = 0x00000020;
 125                 }
 126
 127                 offset += AUDIO_LINE_SIZE;
 128         }
 129
 130         return rp;
 131 }
 132
 133 int cx25821_risc_buffer_upstream_audio(struct cx25821_dev *dev,
 134                                        struct pci_dev *pci,
 135                                        unsigned int bpl, unsigned int lines)
 136 {
 137         __le32 *rp;
 138         int fifo_enable = 0;
 139         int frame = 0, i = 0;
 140         int frame_size = AUDIO_DATA_BUF_SZ;
 141         int databuf_offset = 0;
 142         int risc_flag = RISC_CNT_INC;
 143         dma_addr_t risc_phys_jump_addr;
 144
 145         /* Virtual address of Risc buffer program */
 146         rp = dev->_risc_virt_addr;
 147
 148         /* sync instruction */
 149         *(rp++) = cpu_to_le32(RISC_RESYNC | AUDIO_SYNC_LINE);
 150
 151         for (frame = 0; frame < NUM_AUDIO_FRAMES; frame++) {
 152                 databuf_offset = frame_size * frame;
 153
 154                 if (frame == 0) {
 155                         fifo_enable = 1;
 156                         risc_flag = RISC_CNT_RESET;
 157                 } else {
 158                         fifo_enable = 0;
 159                         risc_flag = RISC_CNT_INC;
 160                 }
 161
 162                 //Calculate physical jump address
 163                 if ((frame + 1) == NUM_AUDIO_FRAMES) {
 164                         risc_phys_jump_addr =
 165                             dev->_risc_phys_start_addr +
 166                             RISC_SYNC_INSTRUCTION_SIZE;
 167                 } else {
 168                         risc_phys_jump_addr =
 169                             dev->_risc_phys_start_addr +
 170                             RISC_SYNC_INSTRUCTION_SIZE +
 171                             AUDIO_RISC_DMA_BUF_SIZE * (frame + 1);
 172                 }
 173
 174                 rp = cx25821_risc_field_upstream_audio(dev, rp,
 175                                                        dev->
 176                                                        _audiodata_buf_phys_addr
 177                                                        + databuf_offset, bpl,
 178                                                        fifo_enable);
 179
 180                 if (USE_RISC_NOOP_AUDIO) {
 181                         for (i = 0; i < NUM_NO_OPS; i++) {
 182                                 *(rp++) = cpu_to_le32(RISC_NOOP);
 183                         }
 184                 }
 185
 186                 // Loop to (Nth)FrameRISC or to Start of Risc program & generate IRQ
 187                 *(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | risc_flag);
 188                 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
 189                 *(rp++) = cpu_to_le32(0);
 190
 191                 //Recalculate virtual address based on frame index
 192                 rp = dev->_risc_virt_addr + RISC_SYNC_INSTRUCTION_SIZE / 4 +
 193                     (AUDIO_RISC_DMA_BUF_SIZE * (frame + 1) / 4);
 194         }
 195
 196         return 0;
 197 }
 198
 199 void cx25821_free_memory_audio(struct cx25821_dev *dev)
 200 {
 201         if (dev->_risc_virt_addr) {
 202                 pci_free_consistent(dev->pci, dev->_audiorisc_size,
 203                                     dev->_risc_virt_addr, dev->_risc_phys_addr);
 204                 dev->_risc_virt_addr = NULL;
 205         }
 206
 207         if (dev->_audiodata_buf_virt_addr) {
 208                 pci_free_consistent(dev->pci, dev->_audiodata_buf_size,
 209                                     dev->_audiodata_buf_virt_addr,
 210                                     dev->_audiodata_buf_phys_addr);
 211                 dev->_audiodata_buf_virt_addr = NULL;
 212         }
 213 }
 214
 215 void cx25821_stop_upstream_audio(struct cx25821_dev *dev)
 216 {
 217         struct sram_channel *sram_ch =
 218             &dev->sram_channels[AUDIO_UPSTREAM_SRAM_CHANNEL_B];
 219         u32 tmp = 0;
 220
 221         if (!dev->_audio_is_running) {
 222                 printk
 223                     ("cx25821: No audio file is currently running so return!\n");
 224                 return;
 225         }
 226         //Disable RISC interrupts
 227         cx_write(sram_ch->int_msk, 0);
 228
 229         //Turn OFF risc and fifo enable in AUD_DMA_CNTRL
 230         tmp = cx_read(sram_ch->dma_ctl);
 231         cx_write(sram_ch->dma_ctl,
 232                  tmp & ~(sram_ch->fld_aud_fifo_en | sram_ch->fld_aud_risc_en));
 233
 234         //Clear data buffer memory
 235         if (dev->_audiodata_buf_virt_addr)
 236                 memset(dev->_audiodata_buf_virt_addr, 0,
 237                        dev->_audiodata_buf_size);
 238
 239         dev->_audio_is_running = 0;
 240         dev->_is_first_audio_frame = 0;
 241         dev->_audioframe_count = 0;
 242         dev->_audiofile_status = END_OF_FILE;
 243
 244         if (dev->_irq_audio_queues) {
 245                 kfree(dev->_irq_audio_queues);
 246                 dev->_irq_audio_queues = NULL;
 247         }
 248
 249         if (dev->_audiofilename != NULL)
 250                 kfree(dev->_audiofilename);
 251 }
 252
 253 void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
 254 {
 255         if (dev->_audio_is_running) {
 256                 cx25821_stop_upstream_audio(dev);
 257         }
 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("%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("%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("%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("ERROR %s(): since container_of(work_struct) FAILED! \n",
 350                        __func__);
 351                 return;
 352         }
 353
 354         cx25821_get_audio_data(dev,
 355                                &dev->sram_channels[dev->
 356                                                    _audio_upstream_channel_select]);
 357 }
 358
 359 int cx25821_openfile_audio(struct cx25821_dev *dev,
 360                            struct sram_channel *sram_ch)
 361 {
 362         struct file *myfile;
 363         int i = 0, j = 0;
 364         int line_size = AUDIO_LINE_SIZE;
 365         ssize_t vfs_read_retval = 0;
 366         char mybuf[line_size];
 367         loff_t pos;
 368         loff_t offset = (unsigned long)0;
 369         mm_segment_t old_fs;
 370
 371         myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 372
 373         if (IS_ERR(myfile)) {
 374                 const int open_errno = -PTR_ERR(myfile);
 375                 printk("%s(): ERROR opening file(%s) with errno = %d! \n",
 376                        __func__, dev->_audiofilename, open_errno);
 377                 return PTR_ERR(myfile);
 378         } else {
 379                 if (!(myfile->f_op)) {
 380                         printk("%s: File has no file operations registered! \n",
 381                                __func__);
 382                         filp_close(myfile, NULL);
 383                         return -EIO;
 384                 }
 385
 386                 if (!myfile->f_op->read) {
 387                         printk("%s: File has no READ operations registered! \n",
 388                                __func__);
 389                         filp_close(myfile, NULL);
 390                         return -EIO;
 391                 }
 392
 393                 pos = myfile->f_pos;
 394                 old_fs = get_fs();
 395                 set_fs(KERNEL_DS);
 396
 397                 for (j = 0; j < NUM_AUDIO_FRAMES; j++) {
 398                         for (i = 0; i < dev->_audio_lines_count; i++) {
 399                                 pos = offset;
 400
 401                                 vfs_read_retval =
 402                                     vfs_read(myfile, mybuf, line_size, &pos);
 403
 404                                 if (vfs_read_retval > 0
 405                                     && vfs_read_retval == line_size
 406                                     && dev->_audiodata_buf_virt_addr != NULL) {
 407                                         memcpy((void *)(dev->
 408                                                         _audiodata_buf_virt_addr
 409                                                         + offset / 4), mybuf,
 410                                                vfs_read_retval);
 411                                 }
 412
 413                                 offset += vfs_read_retval;
 414
 415                                 if (vfs_read_retval < line_size) {
 416                                         printk(KERN_INFO
 417                                                "Done: exit %s() since no more bytes to read from Audio file.\n",
 418                                                __func__);
 419                                         break;
 420                                 }
 421                         }
 422
 423                         if (i > 0) {
 424                                 dev->_audioframe_count++;
 425                         }
 426
 427                         if (vfs_read_retval < line_size) {
 428                                 break;
 429                         }
 430                 }
 431
 432                 dev->_audiofile_status =
 433                     (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
 434
 435                 set_fs(old_fs);
 436                 myfile->f_pos = 0;
 437                 filp_close(myfile, NULL);
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int cx25821_audio_upstream_buffer_prepare(struct cx25821_dev *dev,
 444                                                  struct sram_channel *sram_ch,
 445                                                  int bpl)
 446 {
 447         int ret = 0;
 448         dma_addr_t dma_addr;
 449         dma_addr_t data_dma_addr;
 450
 451         cx25821_free_memory_audio(dev);
 452
 453         dev->_risc_virt_addr =
 454             pci_alloc_consistent(dev->pci, dev->audio_upstream_riscbuf_size,
 455                                  &dma_addr);
 456         dev->_risc_virt_start_addr = dev->_risc_virt_addr;
 457         dev->_risc_phys_start_addr = dma_addr;
 458         dev->_risc_phys_addr = dma_addr;
 459         dev->_audiorisc_size = dev->audio_upstream_riscbuf_size;
 460
 461         if (!dev->_risc_virt_addr) {
 462                 printk
 463                     ("cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for RISC program! Returning.\n");
 464                 return -ENOMEM;
 465         }
 466         //Clear out memory at address
 467         memset(dev->_risc_virt_addr, 0, dev->_audiorisc_size);
 468
 469         //For Audio Data buffer allocation
 470         dev->_audiodata_buf_virt_addr =
 471             pci_alloc_consistent(dev->pci, dev->audio_upstream_databuf_size,
 472                                  &data_dma_addr);
 473         dev->_audiodata_buf_phys_addr = data_dma_addr;
 474         dev->_audiodata_buf_size = dev->audio_upstream_databuf_size;
 475
 476         if (!dev->_audiodata_buf_virt_addr) {
 477                 printk
 478                     ("cx25821 ERROR: pci_alloc_consistent() FAILED to allocate memory for data buffer! Returning. \n");
 479                 return -ENOMEM;
 480         }
 481         //Clear out memory at address
 482         memset(dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size);
 483
 484         ret = cx25821_openfile_audio(dev, sram_ch);
 485         if (ret < 0)
 486                 return ret;
 487
 488         //Creating RISC programs
 489         ret =
 490             cx25821_risc_buffer_upstream_audio(dev, dev->pci, bpl,
 491                                                dev->_audio_lines_count);
 492         if (ret < 0) {
 493                 printk(KERN_DEBUG
 494                        "cx25821 ERROR creating audio upstream RISC programs! \n");
 495                 goto error;
 496         }
 497
 498         return 0;
 499
 500       error:
 501         return ret;
 502 }
 503
 504 int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num,
 505                                u32 status)
 506 {
 507         int i = 0;
 508         u32 int_msk_tmp;
 509         struct sram_channel *channel = &dev->sram_channels[chan_num];
 510         dma_addr_t risc_phys_jump_addr;
 511         __le32 *rp;
 512
 513         if (status & FLD_AUD_SRC_RISCI1) {
 514                 //Get interrupt_index of the program that interrupted
 515                 u32 prog_cnt = cx_read(channel->gpcnt);
 516
 517                 //Since we've identified our IRQ, clear our bits from the 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
 531                         dev->_audioframe_index = dev->_last_index_irq;
 532
 533                         queue_work(dev->_irq_audio_queues,
 534                                    &dev->_audio_work_entry);
 535                 }
 536
 537                 if (dev->_is_first_audio_frame) {
 538                         dev->_is_first_audio_frame = 0;
 539
 540                         if (dev->_risc_virt_start_addr != NULL) {
 541                                 risc_phys_jump_addr =
 542                                     dev->_risc_phys_start_addr +
 543                                     RISC_SYNC_INSTRUCTION_SIZE +
 544                                     AUDIO_RISC_DMA_BUF_SIZE;
 545
 546                                 rp = cx25821_risc_field_upstream_audio(dev,
 547                                                                        dev->
 548                                                                        _risc_virt_start_addr
 549                                                                        + 1,
 550                                                                        dev->
 551                                                                        _audiodata_buf_phys_addr,
 552                                                                        AUDIO_LINE_SIZE,
 553                                                                        FIFO_DISABLE);
 554
 555                                 if (USE_RISC_NOOP_AUDIO) {
 556                                         for (i = 0; i < NUM_NO_OPS; i++) {
 557                                                 *(rp++) =
 558                                                     cpu_to_le32(RISC_NOOP);
 559                                         }
 560                                 }
 561                                 // Jump to 2nd Audio Frame
 562                                 *(rp++) =
 563                                     cpu_to_le32(RISC_JUMP | RISC_IRQ1 |
 564                                                 RISC_CNT_RESET);
 565                                 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
 566                                 *(rp++) = cpu_to_le32(0);
 567                         }
 568                 }
 569
 570                 spin_unlock(&dev->slock);
 571         } else {
 572                 if (status & FLD_AUD_SRC_OF)
 573                         printk("%s: Audio Received Overflow Error Interrupt!\n",
 574                                __func__);
 575
 576                 if (status & FLD_AUD_SRC_SYNC)
 577                         printk("%s: Audio Received Sync Error Interrupt!\n",
 578                                __func__);
 579
 580                 if (status & FLD_AUD_SRC_OPC_ERR)
 581                         printk("%s: Audio Received OpCode Error Interrupt!\n",
 582                                __func__);
 583
 584                 // Read and write back the interrupt status register to clear 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
 630         return IRQ_RETVAL(handled);
 631 }
 632
 633 static void cx25821_wait_fifo_enable(struct cx25821_dev *dev,
 634                                      struct sram_channel *sram_ch)
 635 {
 636         int count = 0;
 637         u32 tmp;
 638
 639         do {
 640                 //Wait 10 microsecond before checking to see if the FIFO is turned ON.
 641                 udelay(10);
 642
 643                 tmp = cx_read(sram_ch->dma_ctl);
 644
 645                 if (count++ > 1000)     //10 millisecond timeout
 646                 {
 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 program counter(IPC) member of the CMDS.
 664         cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
 665         cx_write(sram_ch->cmds_start + 4, 0);   /* Risc IPC High 64 bits 63-32 */
 666
 667         /* reset counter */
 668         cx_write(sram_ch->gpcnt_ctl, 3);
 669
 670         //Set the line length       (It looks like we do not need to set the line length)
 671         cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);
 672
 673         //Set the input mode to 16-bit
 674         tmp = cx_read(sram_ch->aud_cfg);
 675         tmp |=
 676             FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE |
 677             FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D | FLD_AUD_SONY_MODE;
 678         cx_write(sram_ch->aud_cfg, tmp);
 679
 680         // Read and write back the interrupt status register to clear it
 681         tmp = cx_read(sram_ch->int_stat);
 682         cx_write(sram_ch->int_stat, tmp);
 683
 684         // Clear our bits from the interrupt status register.
 685         cx_write(sram_ch->int_stat, _intr_msk);
 686
 687         //Set the interrupt mask register, enable irq.
 688         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
 689         tmp = cx_read(sram_ch->int_msk);
 690         cx_write(sram_ch->int_msk, tmp |= _intr_msk);
 691
 692         err =
 693             request_irq(dev->pci->irq, cx25821_upstream_irq_audio,
 694                         IRQF_SHARED | IRQF_DISABLED, dev->name, dev);
 695         if (err < 0) {
 696                 printk(KERN_ERR "%s: can't get upstream IRQ %d\n", dev->name,
 697                        dev->pci->irq);
 698                 goto fail_irq;
 699         }
 700
 701         // Start the DMA  engine
 702         tmp = cx_read(sram_ch->dma_ctl);
 703         cx_set(sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en);
 704
 705         dev->_audio_is_running = 1;
 706         dev->_is_first_audio_frame = 1;
 707
 708         // The fifo_en bit turns on by the first Risc program
 709         cx25821_wait_fifo_enable(dev, sram_ch);
 710
 711         return 0;
 712
 713       fail_irq:
 714         cx25821_dev_unregister(dev);
 715         return err;
 716 }
 717
 718 int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
 719 {
 720         struct sram_channel *sram_ch;
 721         int retval = 0;
 722         int err = 0;
 723         int str_length = 0;
 724
 725         if (dev->_audio_is_running) {
 726                 printk("Audio Channel is still running so return!\n");
 727                 return 0;
 728         }
 729
 730         dev->_audio_upstream_channel_select = channel_select;
 731         sram_ch = &dev->sram_channels[channel_select];
 732
 733         //Work queue
 734         INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
 735         dev->_irq_audio_queues =
 736             create_singlethread_workqueue("cx25821_audioworkqueue");
 737
 738         if (!dev->_irq_audio_queues) {
 739                 printk
 740                     ("cx25821 ERROR: create_singlethread_workqueue() for Audio FAILED!\n");
 741                 return -ENOMEM;
 742         }
 743
 744         dev->_last_index_irq = 0;
 745         dev->_audio_is_running = 0;
 746         dev->_audioframe_count = 0;
 747         dev->_audiofile_status = RESET_STATUS;
 748         dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
 749         _line_size = AUDIO_LINE_SIZE;
 750
 751         if (dev->input_audiofilename) {
 752                 str_length = strlen(dev->input_audiofilename);
 753                 dev->_audiofilename =
 754                     (char *)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 =
 769                     (char *)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 }