// SPDX-License-Identifier: GPL-2.0-only
/*****************************************************************************
*
* Copyright ( C ) 2008 Cedric Bregardis < cedric . bregardis @ free . fr > and
* Jean - Christian Hassler < jhassler @ free . fr >
*
* This file is part of the Audiowerk2 ALSA driver
*
*****************************************************************************/
#define AW2_SAA7146_M
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "saa7146.h"
#include "aw2-saa7146.h"
#include "aw2-tsl.c"
#define WRITEREG(value, addr) writel((value), chip->base_addr + (addr))
#define READREG(addr) readl(chip->base_addr + (addr))
static struct snd_aw2_saa7146_cb_param
arr_substream_it_playback_cb[NB_STREAM_PLAYBACK];
static struct snd_aw2_saa7146_cb_param
arr_substream_it_capture_cb[NB_STREAM_CAPTURE];
static int snd_aw2_saa7146_get_limit(int size);
/* chip-specific destructor */
int snd_aw2_saa7146_free(struct snd_aw2_saa7146 *chip)
{
/* disable all irqs */
WRITEREG(0 , IER);
/* reset saa7146 */
WRITEREG((MRST_N << 16 ), MC1);
/* Unset base addr */
chip->base_addr = NULL;
return 0 ;
}
void snd_aw2_saa7146_setup(struct snd_aw2_saa7146 *chip,
void __iomem *pci_base_addr)
{
/* set PCI burst/threshold
Burst length definition
VALUE BURST LENGTH
000 1 Dword
001 2 Dwords
010 4 Dwords
011 8 Dwords
100 16 Dwords
101 32 Dwords
110 64 Dwords
111 128 Dwords
Threshold definition
VALUE WRITE MODE READ MODE
00 1 Dword of valid data 1 empty Dword
01 4 Dwords of valid data 4 empty Dwords
10 8 Dwords of valid data 8 empty Dwords
11 16 Dwords of valid data 16 empty Dwords */
unsigned int acon2;
unsigned int acon1 = 0 ;
int i;
/* Set base addr */
chip->base_addr = pci_base_addr;
/* disable all irqs */
WRITEREG(0 , IER);
/* reset saa7146 */
WRITEREG((MRST_N << 16 ), MC1);
/* enable audio interface */
#ifdef __BIG_ENDIAN
acon1 |= A1_SWAP;
acon1 |= A2_SWAP;
#endif
/* WS0_CTRL, WS0_SYNC: input TSL1, I2S */
/* At initialization WS1 and WS2 are disabled (configured as input) */
acon1 |= 0 * WS1_CTRL;
acon1 |= 0 * WS2_CTRL;
/* WS4 is not used. So it must not restart A2.
This is why it is configured as output (force to low) */
acon1 |= 3 * WS4_CTRL;
/* WS3_CTRL, WS3_SYNC: output TSL2, I2S */
acon1 |= 2 * WS3_CTRL;
/* A1 and A2 are active and asynchronous */
acon1 |= 3 * AUDIO_MODE;
WRITEREG(acon1, ACON1);
/* The following comes from original windows driver.
It is needed to have a correct behavior of input and output
simultenously, but I don't know why ! */
WRITEREG(3 * (BurstA1_in) + 3 * (ThreshA1_in) +
3 * (BurstA1_out) + 3 * (ThreshA1_out) +
3 * (BurstA2_out) + 3 * (ThreshA2_out), PCI_BT_A);
/* enable audio port pins */
WRITEREG((EAP << 16 ) | EAP, MC1);
/* enable I2C */
WRITEREG((EI2C << 16 ) | EI2C, MC1);
/* enable interrupts */
WRITEREG(A1_out | A2_out | A1_in | IIC_S | IIC_E, IER);
/* audio configuration */
acon2 = A2_CLKSRC | BCLK1_OEN;
WRITEREG(acon2, ACON2);
/* By default use analog input */
snd_aw2_saa7146_use_digital_input(chip, 0 );
/* TSL setup */
for (i = 0 ; i < 8 ; ++i) {
WRITEREG(tsl1[i], TSL1 + (i * 4 ));
WRITEREG(tsl2[i], TSL2 + (i * 4 ));
}
}
void snd_aw2_saa7146_pcm_init_playback(struct snd_aw2_saa7146 *chip,
int stream_number,
unsigned long dma_addr,
unsigned long period_size,
unsigned long buffer_size)
{
unsigned long dw_page, dw_limit;
/* Configure DMA for substream
Configuration informations : ALSA has allocated continuous memory
pages . So we don ' t need to use MMU of saa7146 .
*/
/* No MMU -> nothing to do with PageA1, we only configure the limit of
PageAx_out register */
/* Disable MMU */
dw_page = (0 L << 11 );
/* Configure Limit for DMA access.
The limit register defines an address limit , which generates
an interrupt if passed by the actual PCI address pointer .
' 0001 ' means an interrupt will be generated if the lower
6 bits ( 64 bytes ) of the PCI address are zero . ' 0010 '
defines a limit of 128 bytes , ' 0011 ' one of 256 bytes , and
so on up to 1 Mbyte defined by ' 1111 ' . This interrupt range
can be calculated as follows :
Range = 2 ^ ( 5 + Limit ) bytes .
*/
dw_limit = snd_aw2_saa7146_get_limit(period_size);
dw_page |= (dw_limit << 4 );
if (stream_number == 0 ) {
WRITEREG(dw_page, PageA2_out);
/* Base address for DMA transfert. */
/* This address has been reserved by ALSA. */
/* This is a physical address */
WRITEREG(dma_addr, BaseA2_out);
/* Define upper limit for DMA access */
WRITEREG(dma_addr + buffer_size, ProtA2_out);
} else if (stream_number == 1 ) {
WRITEREG(dw_page, PageA1_out);
/* Base address for DMA transfert. */
/* This address has been reserved by ALSA. */
/* This is a physical address */
WRITEREG(dma_addr, BaseA1_out);
/* Define upper limit for DMA access */
WRITEREG(dma_addr + buffer_size, ProtA1_out);
} else {
pr_err("aw2: snd_aw2_saa7146_pcm_init_playback: "
"Substream number is not 0 or 1 -> not managed\n" );
}
}
void snd_aw2_saa7146_pcm_init_capture(struct snd_aw2_saa7146 *chip,
int stream_number, unsigned long dma_addr,
unsigned long period_size,
unsigned long buffer_size)
{
unsigned long dw_page, dw_limit;
/* Configure DMA for substream
Configuration informations : ALSA has allocated continuous memory
pages . So we don ' t need to use MMU of saa7146 .
*/
/* No MMU -> nothing to do with PageA1, we only configure the limit of
PageAx_out register */
/* Disable MMU */
dw_page = (0 L << 11 );
/* Configure Limit for DMA access.
The limit register defines an address limit , which generates
an interrupt if passed by the actual PCI address pointer .
' 0001 ' means an interrupt will be generated if the lower
6 bits ( 64 bytes ) of the PCI address are zero . ' 0010 '
defines a limit of 128 bytes , ' 0011 ' one of 256 bytes , and
so on up to 1 Mbyte defined by ' 1111 ' . This interrupt range
can be calculated as follows :
Range = 2 ^ ( 5 + Limit ) bytes .
*/
dw_limit = snd_aw2_saa7146_get_limit(period_size);
dw_page |= (dw_limit << 4 );
if (stream_number == 0 ) {
WRITEREG(dw_page, PageA1_in);
/* Base address for DMA transfert. */
/* This address has been reserved by ALSA. */
/* This is a physical address */
WRITEREG(dma_addr, BaseA1_in);
/* Define upper limit for DMA access */
WRITEREG(dma_addr + buffer_size, ProtA1_in);
} else {
pr_err("aw2: snd_aw2_saa7146_pcm_init_capture: "
"Substream number is not 0 -> not managed\n" );
}
}
void snd_aw2_saa7146_define_it_playback_callback(unsigned int stream_number,
snd_aw2_saa7146_it_cb
p_it_callback,
void *p_callback_param)
{
if (stream_number < NB_STREAM_PLAYBACK) {
arr_substream_it_playback_cb[stream_number].p_it_callback =
(snd_aw2_saa7146_it_cb) p_it_callback;
arr_substream_it_playback_cb[stream_number].p_callback_param =
(void *)p_callback_param;
}
}
void snd_aw2_saa7146_define_it_capture_callback(unsigned int stream_number,
snd_aw2_saa7146_it_cb
p_it_callback,
void *p_callback_param)
{
if (stream_number < NB_STREAM_CAPTURE) {
arr_substream_it_capture_cb[stream_number].p_it_callback =
(snd_aw2_saa7146_it_cb) p_it_callback;
arr_substream_it_capture_cb[stream_number].p_callback_param =
(void *)p_callback_param;
}
}
void snd_aw2_saa7146_pcm_trigger_start_playback(struct snd_aw2_saa7146 *chip,
int stream_number)
{
unsigned int acon1 = 0 ;
/* In aw8 driver, dma transfert is always active. It is
started and stopped in a larger "space" */
acon1 = READREG(ACON1);
if (stream_number == 0 ) {
WRITEREG((TR_E_A2_OUT << 16 ) | TR_E_A2_OUT, MC1);
/* WS2_CTRL, WS2_SYNC: output TSL2, I2S */
acon1 |= 2 * WS2_CTRL;
WRITEREG(acon1, ACON1);
} else if (stream_number == 1 ) {
WRITEREG((TR_E_A1_OUT << 16 ) | TR_E_A1_OUT, MC1);
/* WS1_CTRL, WS1_SYNC: output TSL1, I2S */
acon1 |= 1 * WS1_CTRL;
WRITEREG(acon1, ACON1);
}
}
void snd_aw2_saa7146_pcm_trigger_stop_playback(struct snd_aw2_saa7146 *chip,
int stream_number)
{
unsigned int acon1 = 0 ;
acon1 = READREG(ACON1);
if (stream_number == 0 ) {
/* WS2_CTRL, WS2_SYNC: output TSL2, I2S */
acon1 &= ~(3 * WS2_CTRL);
WRITEREG(acon1, ACON1);
WRITEREG((TR_E_A2_OUT << 16 ), MC1);
} else if (stream_number == 1 ) {
/* WS1_CTRL, WS1_SYNC: output TSL1, I2S */
acon1 &= ~(3 * WS1_CTRL);
WRITEREG(acon1, ACON1);
WRITEREG((TR_E_A1_OUT << 16 ), MC1);
}
}
void snd_aw2_saa7146_pcm_trigger_start_capture(struct snd_aw2_saa7146 *chip,
int stream_number)
{
/* In aw8 driver, dma transfert is always active. It is
started and stopped in a larger "space" */
if (stream_number == 0 )
WRITEREG((TR_E_A1_IN << 16 ) | TR_E_A1_IN, MC1);
}
void snd_aw2_saa7146_pcm_trigger_stop_capture(struct snd_aw2_saa7146 *chip,
int stream_number)
{
if (stream_number == 0 )
WRITEREG((TR_E_A1_IN << 16 ), MC1);
}
irqreturn_t snd_aw2_saa7146_interrupt(int irq, void *dev_id)
{
unsigned int isr;
__always_unused unsigned int iicsta;
struct snd_aw2_saa7146 *chip = dev_id;
isr = READREG(ISR);
if (!isr)
return IRQ_NONE;
WRITEREG(isr, ISR);
if (isr & (IIC_S | IIC_E)) {
iicsta = READREG(IICSTA);
WRITEREG(0 x100, IICSTA);
}
if (isr & A1_out) {
if (arr_substream_it_playback_cb[1 ].p_it_callback != NULL) {
arr_substream_it_playback_cb[1 ].
p_it_callback(arr_substream_it_playback_cb[1 ].
p_callback_param);
}
}
if (isr & A2_out) {
if (arr_substream_it_playback_cb[0 ].p_it_callback != NULL) {
arr_substream_it_playback_cb[0 ].
p_it_callback(arr_substream_it_playback_cb[0 ].
p_callback_param);
}
}
if (isr & A1_in) {
if (arr_substream_it_capture_cb[0 ].p_it_callback != NULL) {
arr_substream_it_capture_cb[0 ].
p_it_callback(arr_substream_it_capture_cb[0 ].
p_callback_param);
}
}
return IRQ_HANDLED;
}
unsigned int snd_aw2_saa7146_get_hw_ptr_playback(struct snd_aw2_saa7146 *chip,
int stream_number,
unsigned char *start_addr,
unsigned int buffer_size)
{
long pci_adp = 0 ;
size_t ptr = 0 ;
if (stream_number == 0 ) {
pci_adp = READREG(PCI_ADP3);
ptr = pci_adp - (long )start_addr;
if (ptr == buffer_size)
ptr = 0 ;
}
if (stream_number == 1 ) {
pci_adp = READREG(PCI_ADP1);
ptr = pci_adp - (size_t) start_addr;
if (ptr == buffer_size)
ptr = 0 ;
}
return ptr;
}
unsigned int snd_aw2_saa7146_get_hw_ptr_capture(struct snd_aw2_saa7146 *chip,
int stream_number,
unsigned char *start_addr,
unsigned int buffer_size)
{
size_t pci_adp = 0 ;
size_t ptr = 0 ;
if (stream_number == 0 ) {
pci_adp = READREG(PCI_ADP2);
ptr = pci_adp - (size_t) start_addr;
if (ptr == buffer_size)
ptr = 0 ;
}
return ptr;
}
void snd_aw2_saa7146_use_digital_input(struct snd_aw2_saa7146 *chip,
int use_digital)
{
/* FIXME: switch between analog and digital input does not always work.
It can produce a kind of white noise . It seams that received data
are inverted sometime ( endian inversion ) . Why ? I don ' t know , maybe
a problem of synchronization . . . However for the time being I have
not found the problem . Workaround : switch again ( and again ) between
digital and analog input until it works. */
if (use_digital)
WRITEREG(0 x40, GPIO_CTRL);
else
WRITEREG(0 x50, GPIO_CTRL);
}
int snd_aw2_saa7146_is_using_digital_input(struct snd_aw2_saa7146 *chip)
{
unsigned int reg_val = READREG(GPIO_CTRL);
if ((reg_val & 0 xFF) == 0 x40)
return 1 ;
else
return 0 ;
}
static int snd_aw2_saa7146_get_limit(int size)
{
int limitsize = 32 ;
int limit = 0 ;
while (limitsize < size) {
limitsize *= 2 ;
limit++;
}
return limit;
}
Messung V0.5 in Prozent C=88 H=100 G=94
¤ Dauer der Verarbeitung: 0.11 Sekunden
(vorverarbeitet am 2026-09-28)
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