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         if (dev->_irq_audio_queues) {
 248                 kfree(dev->_irq_audio_queues);
 249                 dev->_irq_audio_queues = NULL;
 250         }
 251
 252         if (dev->_audiofilename != NULL)
 253                 kfree(dev->_audiofilename);
 254 }
 255
 256 void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
 257 {
 258         if (dev->_audio_is_running)
 259                 cx25821_stop_upstream_audio(dev);
 260
 261         cx25821_free_memory_audio(dev);
 262 }
 263
 264 int cx25821_get_audio_data(struct cx25821_dev *dev,
 265                            struct sram_channel *sram_ch)
 266 {
 267         struct file *myfile;
 268         int frame_index_temp = dev->_audioframe_index;
 269         int i = 0;
 270         int line_size = AUDIO_LINE_SIZE;
 271         int frame_size = AUDIO_DATA_BUF_SZ;
 272         int frame_offset = frame_size * frame_index_temp;
 273         ssize_t vfs_read_retval = 0;
 274         char mybuf[line_size];
 275         loff_t file_offset = dev->_audioframe_count * frame_size;
 276         loff_t pos;
 277         mm_segment_t old_fs;
 278
 279         if (dev->_audiofile_status == END_OF_FILE)
 280                 return 0;
 281
 282         myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 283
 284         if (IS_ERR(myfile)) {
 285                 const int open_errno = -PTR_ERR(myfile);
 286                 pr_err("%s(): ERROR opening file(%s) with errno = %d!\n",
 287                        __func__, dev->_audiofilename, open_errno);
 288                 return PTR_ERR(myfile);
 289         } else {
 290                 if (!(myfile->f_op)) {
 291                         pr_err("%s(): File has no file operations registered!\n",
 292                                __func__);
 293                         filp_close(myfile, NULL);
 294                         return -EIO;
 295                 }
 296
 297                 if (!myfile->f_op->read) {
 298                         pr_err("%s(): File has no READ operations registered!\n",
 299                                __func__);
 300                         filp_close(myfile, NULL);
 301                         return -EIO;
 302                 }
 303
 304                 pos = myfile->f_pos;
 305                 old_fs = get_fs();
 306                 set_fs(KERNEL_DS);
 307
 308                 for (i = 0; i < dev->_audio_lines_count; i++) {
 309                         pos = file_offset;
 310
 311                         vfs_read_retval =
 312                             vfs_read(myfile, mybuf, line_size, &pos);
 313
 314                         if (vfs_read_retval > 0 && vfs_read_retval == line_size
 315                             && dev->_audiodata_buf_virt_addr != NULL) {
 316                                 memcpy((void *)(dev->_audiodata_buf_virt_addr +
 317                                                 frame_offset / 4), mybuf,
 318                                        vfs_read_retval);
 319                         }
 320
 321                         file_offset += vfs_read_retval;
 322                         frame_offset += vfs_read_retval;
 323
 324                         if (vfs_read_retval < line_size) {
 325                                 pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
 326                                         __func__);
 327                                 break;
 328                         }
 329                 }
 330
 331                 if (i > 0)
 332                         dev->_audioframe_count++;
 333
 334                 dev->_audiofile_status =
 335                     (vfs_read_retval == line_size) ? IN_PROGRESS : END_OF_FILE;
 336
 337                 set_fs(old_fs);
 338                 filp_close(myfile, NULL);
 339         }
 340
 341         return 0;
 342 }
 343
 344 static void cx25821_audioups_handler(struct work_struct *work)
 345 {
 346         struct cx25821_dev *dev =
 347             container_of(work, struct cx25821_dev, _audio_work_entry);
 348
 349         if (!dev) {
 350                 pr_err("ERROR %s(): since container_of(work_struct) FAILED!\n",
 351                        __func__);
 352                 return;
 353         }
 354
 355         cx25821_get_audio_data(dev,
 356                               dev->channels[dev->
 357                                        _audio_upstream_channel_select].
 358                                        sram_channels);
 359 }
 360
 361 int cx25821_openfile_audio(struct cx25821_dev *dev,
 362                            struct sram_channel *sram_ch)
 363 {
 364         struct file *myfile;
 365         int i = 0, j = 0;
 366         int line_size = AUDIO_LINE_SIZE;
 367         ssize_t vfs_read_retval = 0;
 368         char mybuf[line_size];
 369         loff_t pos;
 370         loff_t offset = (unsigned long)0;
 371         mm_segment_t old_fs;
 372
 373         myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 374
 375         if (IS_ERR(myfile)) {
 376                 const int open_errno = -PTR_ERR(myfile);
 377                 pr_err("%s(): ERROR opening file(%s) with errno = %d!\n",
 378                        __func__, dev->_audiofilename, open_errno);
 379                 return PTR_ERR(myfile);
 380         } else {
 381                 if (!(myfile->f_op)) {
 382                         pr_err("%s(): File has no file operations registered!\n",
 383                                __func__);
 384                         filp_close(myfile, NULL);
 385                         return -EIO;
 386                 }
 387
 388                 if (!myfile->f_op->read) {
 389                         pr_err("%s(): File has no READ operations registered!\n",
 390                                __func__);
 391                         filp_close(myfile, NULL);
 392                         return -EIO;
 393                 }
 394
 395                 pos = myfile->f_pos;
 396                 old_fs = get_fs();
 397                 set_fs(KERNEL_DS);
 398
 399                 for (j = 0; j < NUM_AUDIO_FRAMES; j++) {
 400                         for (i = 0; i < dev->_audio_lines_count; i++) {
 401                                 pos = offset;
 402
 403                                 vfs_read_retval =
 404                                     vfs_read(myfile, mybuf, line_size, &pos);
 405
 406                                 if (vfs_read_retval > 0
 407                                     && vfs_read_retval == line_size
 408                                     && dev->_audiodata_buf_virt_addr != NULL) {
 409                                         memcpy((void *)(dev->
 410                                                         _audiodata_buf_virt_addr
 411                                                         + offset / 4), mybuf,
 412                                                vfs_read_retval);
 413                                 }
 414
 415                                 offset += vfs_read_retval;
 416
 417                                 if (vfs_read_retval < line_size) {
 418                                         pr_info("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                        pr_fmt("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                        pr_fmt("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                        pr_fmt("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                         pr_warn("%s(): Audio Received Overflow Error Interrupt!\n",
 573                                 __func__);
 574
 575                 if (status & FLD_AUD_SRC_SYNC)
 576                         pr_warn("%s(): Audio Received Sync Error Interrupt!\n",
 577                                 __func__);
 578
 579                 if (status & FLD_AUD_SRC_OPC_ERR)
 580                         pr_warn("%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                 pr_warn("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                         pr_err("ERROR: %s() fifo is NOT turned on. Timeout!\n",
 648                                __func__);
 649                         return;
 650                 }
 651
 652         } while (!(tmp & sram_ch->fld_aud_fifo_en));
 653
 654 }
 655
 656 int cx25821_start_audio_dma_upstream(struct cx25821_dev *dev,
 657                                      struct sram_channel *sram_ch)
 658 {
 659         u32 tmp = 0;
 660         int err = 0;
 661
 662         /* Set the physical start address of the RISC program in the initial
 663          * program counter(IPC) member of the CMDS. */
 664         cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
 665         /* Risc IPC High 64 bits 63-32 */
 666         cx_write(sram_ch->cmds_start + 4, 0);
 667
 668         /* reset counter */
 669         cx_write(sram_ch->gpcnt_ctl, 3);
 670
 671         /* Set the line length       (It looks like we do not need to set the
 672          * line length) */
 673         cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);
 674
 675         /* Set the input mode to 16-bit */
 676         tmp = cx_read(sram_ch->aud_cfg);
 677         tmp |=
 678             FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE |
 679             FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D | FLD_AUD_SONY_MODE;
 680         cx_write(sram_ch->aud_cfg, tmp);
 681
 682         /* Read and write back the interrupt status register to clear it */
 683         tmp = cx_read(sram_ch->int_stat);
 684         cx_write(sram_ch->int_stat, tmp);
 685
 686         /* Clear our bits from the interrupt status register. */
 687         cx_write(sram_ch->int_stat, _intr_msk);
 688
 689         /* Set the interrupt mask register, enable irq. */
 690         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
 691         tmp = cx_read(sram_ch->int_msk);
 692         cx_write(sram_ch->int_msk, tmp |= _intr_msk);
 693
 694         err =
 695             request_irq(dev->pci->irq, cx25821_upstream_irq_audio,
 696                         IRQF_SHARED | IRQF_DISABLED, dev->name, dev);
 697         if (err < 0) {
 698                 pr_err("%s: can't get upstream IRQ %d\n",
 699                        dev->name, dev->pci->irq);
 700                 goto fail_irq;
 701         }
 702
 703         /* Start the DMA  engine */
 704         tmp = cx_read(sram_ch->dma_ctl);
 705         cx_set(sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en);
 706
 707         dev->_audio_is_running = 1;
 708         dev->_is_first_audio_frame = 1;
 709
 710         /* The fifo_en bit turns on by the first Risc program */
 711         cx25821_wait_fifo_enable(dev, sram_ch);
 712
 713         return 0;
 714
 715 fail_irq:
 716         cx25821_dev_unregister(dev);
 717         return err;
 718 }
 719
 720 int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
 721 {
 722         struct sram_channel *sram_ch;
 723         int retval = 0;
 724         int err = 0;
 725         int str_length = 0;
 726
 727         if (dev->_audio_is_running) {
 728                 pr_warn("Audio Channel is still running so return!\n");
 729                 return 0;
 730         }
 731
 732         dev->_audio_upstream_channel_select = channel_select;
 733         sram_ch = dev->channels[channel_select].sram_channels;
 734
 735         /* Work queue */
 736         INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
 737         dev->_irq_audio_queues =
 738             create_singlethread_workqueue("cx25821_audioworkqueue");
 739
 740         if (!dev->_irq_audio_queues) {
 741                 printk(KERN_DEBUG
 742                        pr_fmt("ERROR: create_singlethread_workqueue() for Audio FAILED!\n"));
 743                 return -ENOMEM;
 744         }
 745
 746         dev->_last_index_irq = 0;
 747         dev->_audio_is_running = 0;
 748         dev->_audioframe_count = 0;
 749         dev->_audiofile_status = RESET_STATUS;
 750         dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
 751         _line_size = AUDIO_LINE_SIZE;
 752
 753         if (dev->input_audiofilename) {
 754                 str_length = strlen(dev->input_audiofilename);
 755                 dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL);
 756
 757                 if (!dev->_audiofilename)
 758                         goto error;
 759
 760                 memcpy(dev->_audiofilename, dev->input_audiofilename,
 761                        str_length + 1);
 762
 763                 /* Default if filename is empty string */
 764                 if (strcmp(dev->input_audiofilename, "") == 0)
 765                         dev->_audiofilename = "/root/audioGOOD.wav";
 766         } else {
 767                 str_length = strlen(_defaultAudioName);
 768                 dev->_audiofilename = kmalloc(str_length + 1, GFP_KERNEL);
 769
 770                 if (!dev->_audiofilename)
 771                         goto error;
 772
 773                 memcpy(dev->_audiofilename, _defaultAudioName, str_length + 1);
 774         }
 775
 776         retval =
 777             cx25821_sram_channel_setup_upstream_audio(dev, sram_ch, _line_size,
 778                                                       0);
 779
 780         dev->audio_upstream_riscbuf_size =
 781             AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS +
 782             RISC_SYNC_INSTRUCTION_SIZE;
 783         dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;
 784
 785         /* Allocating buffers and prepare RISC program */
 786         retval =
 787             cx25821_audio_upstream_buffer_prepare(dev, sram_ch, _line_size);
 788         if (retval < 0) {
 789                 pr_err("%s: Failed to set up Audio upstream buffers!\n",
 790                        dev->name);
 791                 goto error;
 792         }
 793         /* Start RISC engine */
 794         cx25821_start_audio_dma_upstream(dev, sram_ch);
 795
 796         return 0;
 797
 798 error:
 799         cx25821_dev_unregister(dev);
 800
 801         return err;
 802 }