drivers/media/pci/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 static 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].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 static 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->_audiodata_buf_phys_addr + databuf_offset,
 179                                 bpl, fifo_enable);
 180
 181                 if (USE_RISC_NOOP_AUDIO) {
 182                         for (i = 0; i < NUM_NO_OPS; i++)
 183                                 *(rp++) = cpu_to_le32(RISC_NOOP);
 184                 }
 185
 186                 /* Loop to (Nth)FrameRISC or to Start of Risc program &
 187                  * generate IRQ */
 188                 *(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | risc_flag);
 189                 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
 190                 *(rp++) = cpu_to_le32(0);
 191
 192                 /* Recalculate virtual address based on frame index */
 193                 rp = dev->_risc_virt_addr + RISC_SYNC_INSTRUCTION_SIZE / 4 +
 194                         (AUDIO_RISC_DMA_BUF_SIZE * (frame + 1) / 4);
 195         }
 196
 197         return 0;
 198 }
 199
 200 static void cx25821_free_memory_audio(struct cx25821_dev *dev)
 201 {
 202         if (dev->_risc_virt_addr) {
 203                 pci_free_consistent(dev->pci, dev->_audiorisc_size,
 204                                     dev->_risc_virt_addr, dev->_risc_phys_addr);
 205                 dev->_risc_virt_addr = NULL;
 206         }
 207
 208         if (dev->_audiodata_buf_virt_addr) {
 209                 pci_free_consistent(dev->pci, dev->_audiodata_buf_size,
 210                                     dev->_audiodata_buf_virt_addr,
 211                                     dev->_audiodata_buf_phys_addr);
 212                 dev->_audiodata_buf_virt_addr = NULL;
 213         }
 214 }
 215
 216 void cx25821_stop_upstream_audio(struct cx25821_dev *dev)
 217 {
 218         struct sram_channel *sram_ch =
 219                 dev->channels[AUDIO_UPSTREAM_SRAM_CHANNEL_B].sram_channels;
 220         u32 tmp = 0;
 221
 222         if (!dev->_audio_is_running) {
 223                 printk(KERN_DEBUG
 224                        pr_fmt("No audio file is currently running so return!\n"));
 225                 return;
 226         }
 227         /* Disable RISC interrupts */
 228         cx_write(sram_ch->int_msk, 0);
 229
 230         /* Turn OFF risc and fifo enable in AUD_DMA_CNTRL */
 231         tmp = cx_read(sram_ch->dma_ctl);
 232         cx_write(sram_ch->dma_ctl,
 233                  tmp & ~(sram_ch->fld_aud_fifo_en | sram_ch->fld_aud_risc_en));
 234
 235         /* Clear data buffer memory */
 236         if (dev->_audiodata_buf_virt_addr)
 237                 memset(dev->_audiodata_buf_virt_addr, 0,
 238                        dev->_audiodata_buf_size);
 239
 240         dev->_audio_is_running = 0;
 241         dev->_is_first_audio_frame = 0;
 242         dev->_audioframe_count = 0;
 243         dev->_audiofile_status = END_OF_FILE;
 244
 245         kfree(dev->_irq_audio_queues);
 246         dev->_irq_audio_queues = NULL;
 247
 248         kfree(dev->_audiofilename);
 249 }
 250
 251 void cx25821_free_mem_upstream_audio(struct cx25821_dev *dev)
 252 {
 253         if (dev->_audio_is_running)
 254                 cx25821_stop_upstream_audio(dev);
 255
 256         cx25821_free_memory_audio(dev);
 257 }
 258
 259 static int cx25821_get_audio_data(struct cx25821_dev *dev,
 260                            struct sram_channel *sram_ch)
 261 {
 262         struct file *myfile;
 263         int frame_index_temp = dev->_audioframe_index;
 264         int i = 0;
 265         int line_size = AUDIO_LINE_SIZE;
 266         int frame_size = AUDIO_DATA_BUF_SZ;
 267         int frame_offset = frame_size * frame_index_temp;
 268         ssize_t vfs_read_retval = 0;
 269         char mybuf[line_size];
 270         loff_t file_offset = dev->_audioframe_count * frame_size;
 271         loff_t pos;
 272         mm_segment_t old_fs;
 273
 274         if (dev->_audiofile_status == END_OF_FILE)
 275                 return 0;
 276
 277         myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 278
 279         if (IS_ERR(myfile)) {
 280                 const int open_errno = -PTR_ERR(myfile);
 281                 pr_err("%s(): ERROR opening file(%s) with errno = %d!\n",
 282                        __func__, dev->_audiofilename, open_errno);
 283                 return PTR_ERR(myfile);
 284         } else {
 285                 if (!(myfile->f_op)) {
 286                         pr_err("%s(): File has no file operations registered!\n",
 287                                 __func__);
 288                         filp_close(myfile, NULL);
 289                         return -EIO;
 290                 }
 291
 292                 if (!myfile->f_op->read) {
 293                         pr_err("%s(): File has no READ operations registered!\n",
 294                                 __func__);
 295                         filp_close(myfile, NULL);
 296                         return -EIO;
 297                 }
 298
 299                 pos = myfile->f_pos;
 300                 old_fs = get_fs();
 301                 set_fs(KERNEL_DS);
 302
 303                 for (i = 0; i < dev->_audio_lines_count; i++) {
 304                         pos = file_offset;
 305
 306                         vfs_read_retval = vfs_read(myfile, mybuf, line_size,
 307                                                                         &pos);
 308
 309                         if (vfs_read_retval > 0 && vfs_read_retval == line_size
 310                             && dev->_audiodata_buf_virt_addr != NULL) {
 311                                 memcpy((void *)(dev->_audiodata_buf_virt_addr +
 312                                                 frame_offset / 4), mybuf,
 313                                         vfs_read_retval);
 314                         }
 315
 316                         file_offset += vfs_read_retval;
 317                         frame_offset += vfs_read_retval;
 318
 319                         if (vfs_read_retval < line_size) {
 320                                 pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
 321                                         __func__);
 322                                 break;
 323                         }
 324                 }
 325
 326                 if (i > 0)
 327                         dev->_audioframe_count++;
 328
 329                 dev->_audiofile_status = (vfs_read_retval == line_size) ?
 330                                                 IN_PROGRESS : END_OF_FILE;
 331
 332                 set_fs(old_fs);
 333                 filp_close(myfile, NULL);
 334         }
 335
 336         return 0;
 337 }
 338
 339 static void cx25821_audioups_handler(struct work_struct *work)
 340 {
 341         struct cx25821_dev *dev = container_of(work, struct cx25821_dev,
 342                         _audio_work_entry);
 343
 344         if (!dev) {
 345                 pr_err("ERROR %s(): since container_of(work_struct) FAILED!\n",
 346                         __func__);
 347                 return;
 348         }
 349
 350         cx25821_get_audio_data(dev, dev->channels[dev->_audio_upstream_channel].
 351                         sram_channels);
 352 }
 353
 354 static int cx25821_openfile_audio(struct cx25821_dev *dev,
 355                            struct sram_channel *sram_ch)
 356 {
 357         struct file *myfile;
 358         int i = 0, j = 0;
 359         int line_size = AUDIO_LINE_SIZE;
 360         ssize_t vfs_read_retval = 0;
 361         char mybuf[line_size];
 362         loff_t pos;
 363         loff_t offset = (unsigned long)0;
 364         mm_segment_t old_fs;
 365
 366         myfile = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 367
 368         if (IS_ERR(myfile)) {
 369                 const int open_errno = -PTR_ERR(myfile);
 370                 pr_err("%s(): ERROR opening file(%s) with errno = %d!\n",
 371                         __func__, dev->_audiofilename, open_errno);
 372                 return PTR_ERR(myfile);
 373         } else {
 374                 if (!(myfile->f_op)) {
 375                         pr_err("%s(): File has no file operations registered!\n",
 376                                 __func__);
 377                         filp_close(myfile, NULL);
 378                         return -EIO;
 379                 }
 380
 381                 if (!myfile->f_op->read) {
 382                         pr_err("%s(): File has no READ operations registered!\n",
 383                                 __func__);
 384                         filp_close(myfile, NULL);
 385                         return -EIO;
 386                 }
 387
 388                 pos = myfile->f_pos;
 389                 old_fs = get_fs();
 390                 set_fs(KERNEL_DS);
 391
 392                 for (j = 0; j < NUM_AUDIO_FRAMES; j++) {
 393                         for (i = 0; i < dev->_audio_lines_count; i++) {
 394                                 pos = offset;
 395
 396                                 vfs_read_retval = vfs_read(myfile, mybuf,
 397                                                 line_size, &pos);
 398
 399                                 if (vfs_read_retval > 0 &&
 400                                     vfs_read_retval == line_size &&
 401                                     dev->_audiodata_buf_virt_addr != NULL) {
 402                                         memcpy((void *)(dev->
 403                                                         _audiodata_buf_virt_addr
 404                                                         + offset / 4), mybuf,
 405                                                vfs_read_retval);
 406                                 }
 407
 408                                 offset += vfs_read_retval;
 409
 410                                 if (vfs_read_retval < line_size) {
 411                                         pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
 412                                                 __func__);
 413                                         break;
 414                                 }
 415                         }
 416
 417                         if (i > 0)
 418                                 dev->_audioframe_count++;
 419
 420                         if (vfs_read_retval < line_size)
 421                                 break;
 422                 }
 423
 424                 dev->_audiofile_status = (vfs_read_retval == line_size) ?
 425                                                 IN_PROGRESS : END_OF_FILE;
 426
 427                 set_fs(old_fs);
 428                 myfile->f_pos = 0;
 429                 filp_close(myfile, NULL);
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int cx25821_audio_upstream_buffer_prepare(struct cx25821_dev *dev,
 436                                                  struct sram_channel *sram_ch,
 437                                                  int bpl)
 438 {
 439         int ret = 0;
 440         dma_addr_t dma_addr;
 441         dma_addr_t data_dma_addr;
 442
 443         cx25821_free_memory_audio(dev);
 444
 445         dev->_risc_virt_addr = pci_alloc_consistent(dev->pci,
 446                         dev->audio_upstream_riscbuf_size, &dma_addr);
 447         dev->_risc_virt_start_addr = dev->_risc_virt_addr;
 448         dev->_risc_phys_start_addr = dma_addr;
 449         dev->_risc_phys_addr = dma_addr;
 450         dev->_audiorisc_size = dev->audio_upstream_riscbuf_size;
 451
 452         if (!dev->_risc_virt_addr) {
 453                 printk(KERN_DEBUG
 454                         pr_fmt("ERROR: pci_alloc_consistent() FAILED to allocate memory for RISC program! Returning\n"));
 455                 return -ENOMEM;
 456         }
 457         /* Clear out memory at address */
 458         memset(dev->_risc_virt_addr, 0, dev->_audiorisc_size);
 459
 460         /* For Audio Data buffer allocation */
 461         dev->_audiodata_buf_virt_addr = pci_alloc_consistent(dev->pci,
 462                         dev->audio_upstream_databuf_size, &data_dma_addr);
 463         dev->_audiodata_buf_phys_addr = data_dma_addr;
 464         dev->_audiodata_buf_size = dev->audio_upstream_databuf_size;
 465
 466         if (!dev->_audiodata_buf_virt_addr) {
 467                 printk(KERN_DEBUG
 468                         pr_fmt("ERROR: pci_alloc_consistent() FAILED to allocate memory for data buffer! Returning\n"));
 469                 return -ENOMEM;
 470         }
 471         /* Clear out memory at address */
 472         memset(dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size);
 473
 474         ret = cx25821_openfile_audio(dev, sram_ch);
 475         if (ret < 0)
 476                 return ret;
 477
 478         /* Creating RISC programs */
 479         ret = cx25821_risc_buffer_upstream_audio(dev, dev->pci, bpl,
 480                                                 dev->_audio_lines_count);
 481         if (ret < 0) {
 482                 printk(KERN_DEBUG
 483                         pr_fmt("ERROR creating audio upstream RISC programs!\n"));
 484                 goto error;
 485         }
 486
 487         return 0;
 488
 489 error:
 490         return ret;
 491 }
 492
 493 static int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num,
 494                                u32 status)
 495 {
 496         int i = 0;
 497         u32 int_msk_tmp;
 498         struct sram_channel *channel = dev->channels[chan_num].sram_channels;
 499         dma_addr_t risc_phys_jump_addr;
 500         __le32 *rp;
 501
 502         if (status & FLD_AUD_SRC_RISCI1) {
 503                 /* Get interrupt_index of the program that interrupted */
 504                 u32 prog_cnt = cx_read(channel->gpcnt);
 505
 506                 /* Since we've identified our IRQ, clear our bits from the
 507                  * interrupt mask and interrupt status registers */
 508                 cx_write(channel->int_msk, 0);
 509                 cx_write(channel->int_stat, cx_read(channel->int_stat));
 510
 511                 spin_lock(&dev->slock);
 512
 513                 while (prog_cnt != dev->_last_index_irq) {
 514                         /* Update _last_index_irq */
 515                         if (dev->_last_index_irq < (NUMBER_OF_PROGRAMS - 1))
 516                                 dev->_last_index_irq++;
 517                         else
 518                                 dev->_last_index_irq = 0;
 519
 520                         dev->_audioframe_index = dev->_last_index_irq;
 521
 522                         queue_work(dev->_irq_audio_queues,
 523                                    &dev->_audio_work_entry);
 524                 }
 525
 526                 if (dev->_is_first_audio_frame) {
 527                         dev->_is_first_audio_frame = 0;
 528
 529                         if (dev->_risc_virt_start_addr != NULL) {
 530                                 risc_phys_jump_addr =
 531                                         dev->_risc_phys_start_addr +
 532                                         RISC_SYNC_INSTRUCTION_SIZE +
 533                                         AUDIO_RISC_DMA_BUF_SIZE;
 534
 535                                 rp = cx25821_risc_field_upstream_audio(dev,
 536                                                 dev->_risc_virt_start_addr + 1,
 537                                                 dev->_audiodata_buf_phys_addr,
 538                                                 AUDIO_LINE_SIZE, FIFO_DISABLE);
 539
 540                                 if (USE_RISC_NOOP_AUDIO) {
 541                                         for (i = 0; i < NUM_NO_OPS; i++) {
 542                                                 *(rp++) =
 543                                                     cpu_to_le32(RISC_NOOP);
 544                                         }
 545                                 }
 546                                 /* Jump to 2nd Audio Frame */
 547                                 *(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 |
 548                                                 RISC_CNT_RESET);
 549                                 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
 550                                 *(rp++) = cpu_to_le32(0);
 551                         }
 552                 }
 553
 554                 spin_unlock(&dev->slock);
 555         } else {
 556                 if (status & FLD_AUD_SRC_OF)
 557                         pr_warn("%s(): Audio Received Overflow Error Interrupt!\n",
 558                                 __func__);
 559
 560                 if (status & FLD_AUD_SRC_SYNC)
 561                         pr_warn("%s(): Audio Received Sync Error Interrupt!\n",
 562                                 __func__);
 563
 564                 if (status & FLD_AUD_SRC_OPC_ERR)
 565                         pr_warn("%s(): Audio Received OpCode Error Interrupt!\n",
 566                                 __func__);
 567
 568                 /* Read and write back the interrupt status register to clear
 569                  * our bits */
 570                 cx_write(channel->int_stat, cx_read(channel->int_stat));
 571         }
 572
 573         if (dev->_audiofile_status == END_OF_FILE) {
 574                 pr_warn("EOF Channel Audio Framecount = %d\n",
 575                         dev->_audioframe_count);
 576                 return -1;
 577         }
 578         /* ElSE, set the interrupt mask register, re-enable irq. */
 579         int_msk_tmp = cx_read(channel->int_msk);
 580         cx_write(channel->int_msk, int_msk_tmp |= _intr_msk);
 581
 582         return 0;
 583 }
 584
 585 static irqreturn_t cx25821_upstream_irq_audio(int irq, void *dev_id)
 586 {
 587         struct cx25821_dev *dev = dev_id;
 588         u32 audio_status;
 589         int handled = 0;
 590         struct sram_channel *sram_ch;
 591
 592         if (!dev)
 593                 return -1;
 594
 595         sram_ch = dev->channels[dev->_audio_upstream_channel].sram_channels;
 596
 597         audio_status = cx_read(sram_ch->int_stat);
 598
 599         /* Only deal with our interrupt */
 600         if (audio_status) {
 601                 handled = cx25821_audio_upstream_irq(dev,
 602                                 dev->_audio_upstream_channel, audio_status);
 603         }
 604
 605         if (handled < 0)
 606                 cx25821_stop_upstream_audio(dev);
 607         else
 608                 handled += handled;
 609
 610         return IRQ_RETVAL(handled);
 611 }
 612
 613 static void cx25821_wait_fifo_enable(struct cx25821_dev *dev,
 614                                      struct sram_channel *sram_ch)
 615 {
 616         int count = 0;
 617         u32 tmp;
 618
 619         do {
 620                 /* Wait 10 microsecond before checking to see if the FIFO is
 621                  * turned ON. */
 622                 udelay(10);
 623
 624                 tmp = cx_read(sram_ch->dma_ctl);
 625
 626                 /* 10 millisecond timeout */
 627                 if (count++ > 1000) {
 628                         pr_err("ERROR: %s() fifo is NOT turned on. Timeout!\n",
 629                                 __func__);
 630                         return;
 631                 }
 632
 633         } while (!(tmp & sram_ch->fld_aud_fifo_en));
 634
 635 }
 636
 637 static int cx25821_start_audio_dma_upstream(struct cx25821_dev *dev,
 638                                             struct sram_channel *sram_ch)
 639 {
 640         u32 tmp = 0;
 641         int err = 0;
 642
 643         /* Set the physical start address of the RISC program in the initial
 644          * program counter(IPC) member of the CMDS. */
 645         cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
 646         /* Risc IPC High 64 bits 63-32 */
 647         cx_write(sram_ch->cmds_start + 4, 0);
 648
 649         /* reset counter */
 650         cx_write(sram_ch->gpcnt_ctl, 3);
 651
 652         /* Set the line length       (It looks like we do not need to set the
 653          * line length) */
 654         cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);
 655
 656         /* Set the input mode to 16-bit */
 657         tmp = cx_read(sram_ch->aud_cfg);
 658         tmp |= FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE |
 659                 FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D |
 660                 FLD_AUD_SONY_MODE;
 661         cx_write(sram_ch->aud_cfg, tmp);
 662
 663         /* Read and write back the interrupt status register to clear it */
 664         tmp = cx_read(sram_ch->int_stat);
 665         cx_write(sram_ch->int_stat, tmp);
 666
 667         /* Clear our bits from the interrupt status register. */
 668         cx_write(sram_ch->int_stat, _intr_msk);
 669
 670         /* Set the interrupt mask register, enable irq. */
 671         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
 672         tmp = cx_read(sram_ch->int_msk);
 673         cx_write(sram_ch->int_msk, tmp |= _intr_msk);
 674
 675         err = request_irq(dev->pci->irq, cx25821_upstream_irq_audio,
 676                         IRQF_SHARED, dev->name, dev);
 677         if (err < 0) {
 678                 pr_err("%s: can't get upstream IRQ %d\n", dev->name,
 679                                 dev->pci->irq);
 680                 goto fail_irq;
 681         }
 682
 683         /* Start the DMA  engine */
 684         tmp = cx_read(sram_ch->dma_ctl);
 685         cx_set(sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en);
 686
 687         dev->_audio_is_running = 1;
 688         dev->_is_first_audio_frame = 1;
 689
 690         /* The fifo_en bit turns on by the first Risc program */
 691         cx25821_wait_fifo_enable(dev, sram_ch);
 692
 693         return 0;
 694
 695 fail_irq:
 696         cx25821_dev_unregister(dev);
 697         return err;
 698 }
 699
 700 int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
 701 {
 702         struct sram_channel *sram_ch;
 703         int retval = 0;
 704         int err = 0;
 705         int str_length = 0;
 706
 707         if (dev->_audio_is_running) {
 708                 pr_warn("Audio Channel is still running so return!\n");
 709                 return 0;
 710         }
 711
 712         dev->_audio_upstream_channel = channel_select;
 713         sram_ch = dev->channels[channel_select].sram_channels;
 714
 715         /* Work queue */
 716         INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
 717         dev->_irq_audio_queues =
 718             create_singlethread_workqueue("cx25821_audioworkqueue");
 719
 720         if (!dev->_irq_audio_queues) {
 721                 printk(KERN_DEBUG
 722                         pr_fmt("ERROR: create_singlethread_workqueue() for Audio FAILED!\n"));
 723                 return -ENOMEM;
 724         }
 725
 726         dev->_last_index_irq = 0;
 727         dev->_audio_is_running = 0;
 728         dev->_audioframe_count = 0;
 729         dev->_audiofile_status = RESET_STATUS;
 730         dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
 731         _line_size = AUDIO_LINE_SIZE;
 732
 733         if (dev->input_audiofilename) {
 734                 str_length = strlen(dev->input_audiofilename);
 735                 dev->_audiofilename = kmemdup(dev->input_audiofilename,
 736                                               str_length + 1, GFP_KERNEL);
 737
 738                 if (!dev->_audiofilename)
 739                         goto error;
 740
 741                 /* Default if filename is empty string */
 742                 if (strcmp(dev->input_audiofilename, "") == 0)
 743                         dev->_audiofilename = "/root/audioGOOD.wav";
 744         } else {
 745                 str_length = strlen(_defaultAudioName);
 746                 dev->_audiofilename = kmemdup(_defaultAudioName,
 747                                               str_length + 1, GFP_KERNEL);
 748
 749                 if (!dev->_audiofilename)
 750                         goto error;
 751         }
 752
 753         retval = cx25821_sram_channel_setup_upstream_audio(dev, sram_ch,
 754                                                         _line_size, 0);
 755
 756         dev->audio_upstream_riscbuf_size =
 757                 AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS +
 758                 RISC_SYNC_INSTRUCTION_SIZE;
 759         dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;
 760
 761         /* Allocating buffers and prepare RISC program */
 762         retval = cx25821_audio_upstream_buffer_prepare(dev, sram_ch,
 763                                                         _line_size);
 764         if (retval < 0) {
 765                 pr_err("%s: Failed to set up Audio upstream buffers!\n",
 766                         dev->name);
 767                 goto error;
 768         }
 769         /* Start RISC engine */
 770         cx25821_start_audio_dma_upstream(dev, sram_ch);
 771
 772         return 0;
 773
 774 error:
 775         cx25821_dev_unregister(dev);
 776
 777         return err;
 778 }