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