mirror of
https://github.com/torvalds/linux.git
synced 2024-11-11 06:31:49 +00:00
a9f00d8df2
Add ALSA support for the opb_ac97_controller_ref_v1_00_a ip core found in Xilinx' ML403 reference design. Known issue: Currently this driver hits a WARN_ON_ONCE(1) statement in kernel/irq/resend.c (line 70). According to Linus (http://lkml.org/lkml/2007/8/5/5) this may be ignored, right? I haven't had a look into this 'problem' yet. Signed-off-by: Joachim Foerster <JOFT@gmx.de> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
141 lines
5.1 KiB
C
141 lines
5.1 KiB
C
/*
|
|
* Helper functions for indirect PCM data transfer to a simple FIFO in
|
|
* hardware (small, no possibility to read "hardware io position",
|
|
* updating position done by interrupt, ...)
|
|
*
|
|
* Copyright (c) by 2007 Joachim Foerster <JOFT@gmx.de>
|
|
*
|
|
* Based on "pcm-indirect.h" (alsa-driver-1.0.13) by
|
|
*
|
|
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
|
|
* Jaroslav Kysela <perex@suse.cz>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#ifndef __SOUND_PCM_INDIRECT2_H
|
|
#define __SOUND_PCM_INDIRECT2_H
|
|
|
|
/* struct snd_pcm_substream, struct snd_pcm_runtime, snd_pcm_uframes_t */
|
|
#include <sound/pcm.h>
|
|
|
|
/* Debug options for code which may be removed completely in a final version */
|
|
#ifdef CONFIG_SND_DEBUG
|
|
#define SND_PCM_INDIRECT2_STAT /* turn on some "statistics" about the
|
|
* process of copying bytes from the
|
|
* intermediate buffer to the hardware
|
|
* fifo and the other way round
|
|
*/
|
|
#endif
|
|
|
|
struct snd_pcm_indirect2 {
|
|
unsigned int hw_buffer_size; /* Byte size of hardware buffer */
|
|
int hw_ready; /* playback: 1 = hw fifo has room left,
|
|
* 0 = hw fifo is full
|
|
*/
|
|
unsigned int min_multiple;
|
|
int min_periods; /* counts number of min. periods until
|
|
* min_multiple is reached
|
|
*/
|
|
int min_period_count; /* counts bytes to count number of
|
|
* min. periods
|
|
*/
|
|
|
|
unsigned int sw_buffer_size; /* Byte size of software buffer */
|
|
|
|
/* sw_data: position in intermediate buffer, where we will read (or
|
|
* write) from/to next time (to transfer data to/from HW)
|
|
*/
|
|
unsigned int sw_data; /* Offset to next dst (or src) in sw
|
|
* ring buffer
|
|
*/
|
|
/* easiest case (playback):
|
|
* sw_data is nearly the same as ~ runtime->control->appl_ptr, with the
|
|
* exception that sw_data is "behind" by the number if bytes ALSA wrote
|
|
* to the intermediate buffer last time.
|
|
* A call to ack() callback synchronizes both indirectly.
|
|
*/
|
|
|
|
/* We have no real sw_io pointer here. Usually sw_io is pointing to the
|
|
* current playback/capture position _inside_ the hardware. Devices
|
|
* with plain FIFOs often have no possibility to publish this position.
|
|
* So we say: if sw_data is updated, that means bytes were copied to
|
|
* the hardware, we increase sw_io by that amount, because there have
|
|
* to be as much bytes which were played. So sw_io will stay behind
|
|
* sw_data all the time and has to converge to sw_data at the end of
|
|
* playback.
|
|
*/
|
|
unsigned int sw_io; /* Current software pointer in bytes */
|
|
|
|
/* sw_ready: number of bytes ALSA copied to the intermediate buffer, so
|
|
* it represents the number of bytes which wait for transfer to the HW
|
|
*/
|
|
int sw_ready; /* Bytes ready to be transferred to/from hw */
|
|
|
|
/* appl_ptr: last known position of ALSA (where ALSA is going to write
|
|
* next time into the intermediate buffer
|
|
*/
|
|
snd_pcm_uframes_t appl_ptr; /* Last seen appl_ptr */
|
|
|
|
unsigned int bytes2hw;
|
|
int check_alignment;
|
|
|
|
#ifdef SND_PCM_INDIRECT2_STAT
|
|
unsigned int zeros2hw;
|
|
unsigned int mul_elapsed;
|
|
unsigned int mul_elapsed_real;
|
|
unsigned long firstbytetime;
|
|
unsigned long lastbytetime;
|
|
unsigned long firstzerotime;
|
|
unsigned int byte_sizes[64];
|
|
unsigned int zero_sizes[64];
|
|
unsigned int min_adds[8];
|
|
unsigned int mul_adds[8];
|
|
unsigned int zero_times[3750]; /* = 15s */
|
|
unsigned int zero_times_saved;
|
|
unsigned int zero_times_notsaved;
|
|
unsigned int irq_occured;
|
|
unsigned int pointer_calls;
|
|
unsigned int lastdifftime;
|
|
#endif
|
|
};
|
|
|
|
typedef size_t (*snd_pcm_indirect2_copy_t) (struct snd_pcm_substream *substream,
|
|
struct snd_pcm_indirect2 *rec,
|
|
size_t bytes);
|
|
typedef size_t (*snd_pcm_indirect2_zero_t) (struct snd_pcm_substream *substream,
|
|
struct snd_pcm_indirect2 *rec);
|
|
|
|
#ifdef SND_PCM_INDIRECT2_STAT
|
|
void snd_pcm_indirect2_stat(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_indirect2 *rec);
|
|
#endif
|
|
|
|
snd_pcm_uframes_t
|
|
snd_pcm_indirect2_pointer(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_indirect2 *rec);
|
|
void
|
|
snd_pcm_indirect2_playback_interrupt(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_indirect2 *rec,
|
|
snd_pcm_indirect2_copy_t copy,
|
|
snd_pcm_indirect2_zero_t zero);
|
|
void
|
|
snd_pcm_indirect2_capture_interrupt(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_indirect2 *rec,
|
|
snd_pcm_indirect2_copy_t copy,
|
|
snd_pcm_indirect2_zero_t null);
|
|
|
|
#endif /* __SOUND_PCM_INDIRECT2_H */
|