LXR linux/drivers/media/pci/cx25821/cx25821-audio.h

   1/*
   2 *  Driver for the Conexant CX25821 PCIe bridge
   3 *
   4 *  Copyright (C) 2009 Conexant Systems Inc.
   5 *  Authors  <shu.lin@conexant.com>, <hiep.huynh@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#ifndef __CX25821_AUDIO_H__
  24#define __CX25821_AUDIO_H__
  25
  26#define USE_RISC_NOOP           1
  27#define LINES_PER_BUFFER        15
  28#define AUDIO_LINE_SIZE         128
  29
  30/* Number of buffer programs to use at once. */
  31#define NUMBER_OF_PROGRAMS      8
  32
  33/*
  34 * Max size of the RISC program for a buffer. - worst case is 2 writes per line
  35 * Space is also added for the 4 no-op instructions added on the end.
  36 */
  37#ifndef USE_RISC_NOOP
  38#define MAX_BUFFER_PROGRAM_SIZE                                         \
  39        (2 * LINES_PER_BUFFER * RISC_WRITE_INSTRUCTION_SIZE +           \
  40         RISC_WRITECR_INSTRUCTION_SIZE * 4)
  41#endif
  42
  43/* MAE 12 July 2005 Try to use NOOP RISC instruction instead */
  44#ifdef USE_RISC_NOOP
  45#define MAX_BUFFER_PROGRAM_SIZE                                         \
  46        (2 * LINES_PER_BUFFER * RISC_WRITE_INSTRUCTION_SIZE +           \
  47         RISC_NOOP_INSTRUCTION_SIZE * 4)
  48#endif
  49
  50/* Sizes of various instructions in bytes.  Used when adding instructions. */
  51#define RISC_WRITE_INSTRUCTION_SIZE     12
  52#define RISC_JUMP_INSTRUCTION_SIZE      12
  53#define RISC_SKIP_INSTRUCTION_SIZE      4
  54#define RISC_SYNC_INSTRUCTION_SIZE      4
  55#define RISC_WRITECR_INSTRUCTION_SIZE   16
  56#define RISC_NOOP_INSTRUCTION_SIZE      4
  57
  58#define MAX_AUDIO_DMA_BUFFER_SIZE                                       \
  59        (MAX_BUFFER_PROGRAM_SIZE * NUMBER_OF_PROGRAMS +                 \
  60         RISC_SYNC_INSTRUCTION_SIZE)
  61
  62#endif
  63