kernel/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                                               const 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         const 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         const 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                            const struct sram_channel *sram_ch)
 261 {
 262         struct file *file;
 263         int frame_index_temp = dev->_audioframe_index;
 264         int i = 0;
 265         int frame_size = AUDIO_DATA_BUF_SZ;
 266         int frame_offset = frame_size * frame_index_temp;
 267         char mybuf[AUDIO_LINE_SIZE];
 268         loff_t file_offset = dev->_audioframe_count * frame_size;
 269         char *p = NULL;
 270
 271         if (dev->_audiofile_status == END_OF_FILE)
 272                 return 0;
 273
 274         file = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 275         if (IS_ERR(file)) {
 276                 pr_err("%s(): ERROR opening file(%s) with errno = %ld!\n",
 277                        __func__, dev->_audiofilename, -PTR_ERR(file));
 278                 return PTR_ERR(file);
 279         }
 280
 281         if (dev->_audiodata_buf_virt_addr)
 282                 p = (char *)dev->_audiodata_buf_virt_addr + frame_offset;
 283
 284         for (i = 0; i < dev->_audio_lines_count; i++) {
 285                 int n = kernel_read(file, file_offset, mybuf, AUDIO_LINE_SIZE);
 286                 if (n < AUDIO_LINE_SIZE) {
 287                         pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
 288                                 __func__);
 289                         dev->_audiofile_status = END_OF_FILE;
 290                         fput(file);
 291                         return 0;
 292                 }
 293                 dev->_audiofile_status = IN_PROGRESS;
 294                 if (p) {
 295                         memcpy(p, mybuf, n);
 296                         p += n;
 297                 }
 298                 file_offset += n;
 299         }
 300         dev->_audioframe_count++;
 301         fput(file);
 302
 303         return 0;
 304 }
 305
 306 static void cx25821_audioups_handler(struct work_struct *work)
 307 {
 308         struct cx25821_dev *dev = container_of(work, struct cx25821_dev,
 309                         _audio_work_entry);
 310
 311         if (!dev) {
 312                 pr_err("ERROR %s(): since container_of(work_struct) FAILED!\n",
 313                         __func__);
 314                 return;
 315         }
 316
 317         cx25821_get_audio_data(dev, dev->channels[dev->_audio_upstream_channel].
 318                         sram_channels);
 319 }
 320
 321 static int cx25821_openfile_audio(struct cx25821_dev *dev,
 322                            const struct sram_channel *sram_ch)
 323 {
 324         char *p = (void *)dev->_audiodata_buf_virt_addr;
 325         struct file *file;
 326         loff_t offset;
 327         int i, j;
 328
 329         file = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
 330         if (IS_ERR(file)) {
 331                 pr_err("%s(): ERROR opening file(%s) with errno = %ld!\n",
 332                         __func__, dev->_audiofilename, PTR_ERR(file));
 333                 return PTR_ERR(file);
 334         }
 335
 336         for (j = 0, offset = 0; j < NUM_AUDIO_FRAMES; j++) {
 337                 for (i = 0; i < dev->_audio_lines_count; i++) {
 338                         char buf[AUDIO_LINE_SIZE];
 339                         int n = kernel_read(file, offset, buf,
 340                                                 AUDIO_LINE_SIZE);
 341
 342                         if (n < AUDIO_LINE_SIZE) {
 343                                 pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
 344                                         __func__);
 345                                 dev->_audiofile_status = END_OF_FILE;
 346                                 fput(file);
 347                                 return 0;
 348                         }
 349
 350                         if (p)
 351                                 memcpy(p + offset, buf, n);
 352
 353                         offset += n;
 354                 }
 355                 dev->_audioframe_count++;
 356         }
 357         dev->_audiofile_status = IN_PROGRESS;
 358         fput(file);
 359         return 0;
 360 }
 361
 362 static int cx25821_audio_upstream_buffer_prepare(struct cx25821_dev *dev,
 363                                                  const struct sram_channel *sram_ch,
 364                                                  int bpl)
 365 {
 366         int ret = 0;
 367         dma_addr_t dma_addr;
 368         dma_addr_t data_dma_addr;
 369
 370         cx25821_free_memory_audio(dev);
 371
 372         dev->_risc_virt_addr = pci_alloc_consistent(dev->pci,
 373                         dev->audio_upstream_riscbuf_size, &dma_addr);
 374         dev->_risc_virt_start_addr = dev->_risc_virt_addr;
 375         dev->_risc_phys_start_addr = dma_addr;
 376         dev->_risc_phys_addr = dma_addr;
 377         dev->_audiorisc_size = dev->audio_upstream_riscbuf_size;
 378
 379         if (!dev->_risc_virt_addr) {
 380                 printk(KERN_DEBUG
 381                         pr_fmt("ERROR: pci_alloc_consistent() FAILED to allocate memory for RISC program! Returning\n"));
 382                 return -ENOMEM;
 383         }
 384         /* Clear out memory at address */
 385         memset(dev->_risc_virt_addr, 0, dev->_audiorisc_size);
 386
 387         /* For Audio Data buffer allocation */
 388         dev->_audiodata_buf_virt_addr = pci_alloc_consistent(dev->pci,
 389                         dev->audio_upstream_databuf_size, &data_dma_addr);
 390         dev->_audiodata_buf_phys_addr = data_dma_addr;
 391         dev->_audiodata_buf_size = dev->audio_upstream_databuf_size;
 392
 393         if (!dev->_audiodata_buf_virt_addr) {
 394                 printk(KERN_DEBUG
 395                         pr_fmt("ERROR: pci_alloc_consistent() FAILED to allocate memory for data buffer! Returning\n"));
 396                 return -ENOMEM;
 397         }
 398         /* Clear out memory at address */
 399         memset(dev->_audiodata_buf_virt_addr, 0, dev->_audiodata_buf_size);
 400
 401         ret = cx25821_openfile_audio(dev, sram_ch);
 402         if (ret < 0)
 403                 return ret;
 404
 405         /* Creating RISC programs */
 406         ret = cx25821_risc_buffer_upstream_audio(dev, dev->pci, bpl,
 407                                                 dev->_audio_lines_count);
 408         if (ret < 0) {
 409                 printk(KERN_DEBUG
 410                         pr_fmt("ERROR creating audio upstream RISC programs!\n"));
 411                 goto error;
 412         }
 413
 414         return 0;
 415
 416 error:
 417         return ret;
 418 }
 419
 420 static int cx25821_audio_upstream_irq(struct cx25821_dev *dev, int chan_num,
 421                                u32 status)
 422 {
 423         int i = 0;
 424         u32 int_msk_tmp;
 425         const struct sram_channel *channel = dev->channels[chan_num].sram_channels;
 426         dma_addr_t risc_phys_jump_addr;
 427         __le32 *rp;
 428
 429         if (status & FLD_AUD_SRC_RISCI1) {
 430                 /* Get interrupt_index of the program that interrupted */
 431                 u32 prog_cnt = cx_read(channel->gpcnt);
 432
 433                 /* Since we've identified our IRQ, clear our bits from the
 434                  * interrupt mask and interrupt status registers */
 435                 cx_write(channel->int_msk, 0);
 436                 cx_write(channel->int_stat, cx_read(channel->int_stat));
 437
 438                 spin_lock(&dev->slock);
 439
 440                 while (prog_cnt != dev->_last_index_irq) {
 441                         /* Update _last_index_irq */
 442                         if (dev->_last_index_irq < (NUMBER_OF_PROGRAMS - 1))
 443                                 dev->_last_index_irq++;
 444                         else
 445                                 dev->_last_index_irq = 0;
 446
 447                         dev->_audioframe_index = dev->_last_index_irq;
 448
 449                         queue_work(dev->_irq_audio_queues,
 450                                    &dev->_audio_work_entry);
 451                 }
 452
 453                 if (dev->_is_first_audio_frame) {
 454                         dev->_is_first_audio_frame = 0;
 455
 456                         if (dev->_risc_virt_start_addr != NULL) {
 457                                 risc_phys_jump_addr =
 458                                         dev->_risc_phys_start_addr +
 459                                         RISC_SYNC_INSTRUCTION_SIZE +
 460                                         AUDIO_RISC_DMA_BUF_SIZE;
 461
 462                                 rp = cx25821_risc_field_upstream_audio(dev,
 463                                                 dev->_risc_virt_start_addr + 1,
 464                                                 dev->_audiodata_buf_phys_addr,
 465                                                 AUDIO_LINE_SIZE, FIFO_DISABLE);
 466
 467                                 if (USE_RISC_NOOP_AUDIO) {
 468                                         for (i = 0; i < NUM_NO_OPS; i++) {
 469                                                 *(rp++) =
 470                                                     cpu_to_le32(RISC_NOOP);
 471                                         }
 472                                 }
 473                                 /* Jump to 2nd Audio Frame */
 474                                 *(rp++) = cpu_to_le32(RISC_JUMP | RISC_IRQ1 |
 475                                                 RISC_CNT_RESET);
 476                                 *(rp++) = cpu_to_le32(risc_phys_jump_addr);
 477                                 *(rp++) = cpu_to_le32(0);
 478                         }
 479                 }
 480
 481                 spin_unlock(&dev->slock);
 482         } else {
 483                 if (status & FLD_AUD_SRC_OF)
 484                         pr_warn("%s(): Audio Received Overflow Error Interrupt!\n",
 485                                 __func__);
 486
 487                 if (status & FLD_AUD_SRC_SYNC)
 488                         pr_warn("%s(): Audio Received Sync Error Interrupt!\n",
 489                                 __func__);
 490
 491                 if (status & FLD_AUD_SRC_OPC_ERR)
 492                         pr_warn("%s(): Audio Received OpCode Error Interrupt!\n",
 493                                 __func__);
 494
 495                 /* Read and write back the interrupt status register to clear
 496                  * our bits */
 497                 cx_write(channel->int_stat, cx_read(channel->int_stat));
 498         }
 499
 500         if (dev->_audiofile_status == END_OF_FILE) {
 501                 pr_warn("EOF Channel Audio Framecount = %d\n",
 502                         dev->_audioframe_count);
 503                 return -1;
 504         }
 505         /* ElSE, set the interrupt mask register, re-enable irq. */
 506         int_msk_tmp = cx_read(channel->int_msk);
 507         cx_write(channel->int_msk, int_msk_tmp |= _intr_msk);
 508
 509         return 0;
 510 }
 511
 512 static irqreturn_t cx25821_upstream_irq_audio(int irq, void *dev_id)
 513 {
 514         struct cx25821_dev *dev = dev_id;
 515         u32 audio_status;
 516         int handled = 0;
 517         const struct sram_channel *sram_ch;
 518
 519         if (!dev)
 520                 return -1;
 521
 522         sram_ch = dev->channels[dev->_audio_upstream_channel].sram_channels;
 523
 524         audio_status = cx_read(sram_ch->int_stat);
 525
 526         /* Only deal with our interrupt */
 527         if (audio_status) {
 528                 handled = cx25821_audio_upstream_irq(dev,
 529                                 dev->_audio_upstream_channel, audio_status);
 530         }
 531
 532         if (handled < 0)
 533                 cx25821_stop_upstream_audio(dev);
 534         else
 535                 handled += handled;
 536
 537         return IRQ_RETVAL(handled);
 538 }
 539
 540 static void cx25821_wait_fifo_enable(struct cx25821_dev *dev,
 541                                      const struct sram_channel *sram_ch)
 542 {
 543         int count = 0;
 544         u32 tmp;
 545
 546         do {
 547                 /* Wait 10 microsecond before checking to see if the FIFO is
 548                  * turned ON. */
 549                 udelay(10);
 550
 551                 tmp = cx_read(sram_ch->dma_ctl);
 552
 553                 /* 10 millisecond timeout */
 554                 if (count++ > 1000) {
 555                         pr_err("ERROR: %s() fifo is NOT turned on. Timeout!\n",
 556                                 __func__);
 557                         return;
 558                 }
 559
 560         } while (!(tmp & sram_ch->fld_aud_fifo_en));
 561
 562 }
 563
 564 static int cx25821_start_audio_dma_upstream(struct cx25821_dev *dev,
 565                                             const struct sram_channel *sram_ch)
 566 {
 567         u32 tmp = 0;
 568         int err = 0;
 569
 570         /* Set the physical start address of the RISC program in the initial
 571          * program counter(IPC) member of the CMDS. */
 572         cx_write(sram_ch->cmds_start + 0, dev->_risc_phys_addr);
 573         /* Risc IPC High 64 bits 63-32 */
 574         cx_write(sram_ch->cmds_start + 4, 0);
 575
 576         /* reset counter */
 577         cx_write(sram_ch->gpcnt_ctl, 3);
 578
 579         /* Set the line length       (It looks like we do not need to set the
 580          * line length) */
 581         cx_write(sram_ch->aud_length, AUDIO_LINE_SIZE & FLD_AUD_DST_LN_LNGTH);
 582
 583         /* Set the input mode to 16-bit */
 584         tmp = cx_read(sram_ch->aud_cfg);
 585         tmp |= FLD_AUD_SRC_ENABLE | FLD_AUD_DST_PK_MODE | FLD_AUD_CLK_ENABLE |
 586                 FLD_AUD_MASTER_MODE | FLD_AUD_CLK_SELECT_PLL_D |
 587                 FLD_AUD_SONY_MODE;
 588         cx_write(sram_ch->aud_cfg, tmp);
 589
 590         /* Read and write back the interrupt status register to clear it */
 591         tmp = cx_read(sram_ch->int_stat);
 592         cx_write(sram_ch->int_stat, tmp);
 593
 594         /* Clear our bits from the interrupt status register. */
 595         cx_write(sram_ch->int_stat, _intr_msk);
 596
 597         /* Set the interrupt mask register, enable irq. */
 598         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << sram_ch->irq_bit));
 599         tmp = cx_read(sram_ch->int_msk);
 600         cx_write(sram_ch->int_msk, tmp |= _intr_msk);
 601
 602         err = request_irq(dev->pci->irq, cx25821_upstream_irq_audio,
 603                         IRQF_SHARED, dev->name, dev);
 604         if (err < 0) {
 605                 pr_err("%s: can't get upstream IRQ %d\n", dev->name,
 606                                 dev->pci->irq);
 607                 goto fail_irq;
 608         }
 609
 610         /* Start the DMA  engine */
 611         tmp = cx_read(sram_ch->dma_ctl);
 612         cx_set(sram_ch->dma_ctl, tmp | sram_ch->fld_aud_risc_en);
 613
 614         dev->_audio_is_running = 1;
 615         dev->_is_first_audio_frame = 1;
 616
 617         /* The fifo_en bit turns on by the first Risc program */
 618         cx25821_wait_fifo_enable(dev, sram_ch);
 619
 620         return 0;
 621
 622 fail_irq:
 623         cx25821_dev_unregister(dev);
 624         return err;
 625 }
 626
 627 int cx25821_audio_upstream_init(struct cx25821_dev *dev, int channel_select)
 628 {
 629         const struct sram_channel *sram_ch;
 630         int err = 0;
 631
 632         if (dev->_audio_is_running) {
 633                 pr_warn("Audio Channel is still running so return!\n");
 634                 return 0;
 635         }
 636
 637         dev->_audio_upstream_channel = channel_select;
 638         sram_ch = dev->channels[channel_select].sram_channels;
 639
 640         /* Work queue */
 641         INIT_WORK(&dev->_audio_work_entry, cx25821_audioups_handler);
 642         dev->_irq_audio_queues =
 643             create_singlethread_workqueue("cx25821_audioworkqueue");
 644
 645         if (!dev->_irq_audio_queues) {
 646                 printk(KERN_DEBUG
 647                         pr_fmt("ERROR: create_singlethread_workqueue() for Audio FAILED!\n"));
 648                 return -ENOMEM;
 649         }
 650
 651         dev->_last_index_irq = 0;
 652         dev->_audio_is_running = 0;
 653         dev->_audioframe_count = 0;
 654         dev->_audiofile_status = RESET_STATUS;
 655         dev->_audio_lines_count = LINES_PER_AUDIO_BUFFER;
 656         _line_size = AUDIO_LINE_SIZE;
 657
 658         if ((dev->input_audiofilename) &&
 659             (strcmp(dev->input_audiofilename, "") != 0))
 660                 dev->_audiofilename = kstrdup(dev->input_audiofilename,
 661                                               GFP_KERNEL);
 662         else
 663                 dev->_audiofilename = kstrdup(_defaultAudioName,
 664                                               GFP_KERNEL);
 665
 666         if (!dev->_audiofilename) {
 667                 err = -ENOMEM;
 668                 goto error;
 669         }
 670
 671         cx25821_sram_channel_setup_upstream_audio(dev, sram_ch,
 672                                                   _line_size, 0);
 673
 674         dev->audio_upstream_riscbuf_size =
 675                 AUDIO_RISC_DMA_BUF_SIZE * NUM_AUDIO_PROGS +
 676                 RISC_SYNC_INSTRUCTION_SIZE;
 677         dev->audio_upstream_databuf_size = AUDIO_DATA_BUF_SZ * NUM_AUDIO_PROGS;
 678
 679         /* Allocating buffers and prepare RISC program */
 680         err = cx25821_audio_upstream_buffer_prepare(dev, sram_ch,
 681                                                         _line_size);
 682         if (err < 0) {
 683                 pr_err("%s: Failed to set up Audio upstream buffers!\n",
 684                         dev->name);
 685                 goto error;
 686         }
 687         /* Start RISC engine */
 688         cx25821_start_audio_dma_upstream(dev, sram_ch);
 689
 690         return 0;
 691
 692 error:
 693         cx25821_dev_unregister(dev);
 694
 695         return err;
 696 }