/* ac97.c
*
* Sound driver for Milkymist SoC
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq
*/
#define RTEMS_STATUS_CHECKS_USE_PRINTK
#include <rtems.h>
#include <bsp.h>
#include <bsp/irq-generic.h>
#include <rtems/libio.h>
#include <rtems/status-checks.h>
#include "../include/system_conf.h"
#include "milkymist_ac97.h"
#define SND_DEVICE_NAME "/dev/snd"
#define MIXER_DEVICE_NAME "/dev/mixer"
static rtems_id cr_write_sem;
static rtems_id cr_read_sem;
static rtems_isr crrequest_handler(rtems_vector_number n)
{
rtems_semaphore_release(cr_write_sem);
lm32_interrupt_ack(1 << MM_IRQ_AC97CRREQUEST);
}
static rtems_isr crreply_handler(rtems_vector_number n)
{
rtems_semaphore_release(cr_read_sem);
lm32_interrupt_ack(1 << MM_IRQ_AC97CRREPLY);
}
/* queued playback buffers */
#define PLAY_Q_SIZE 8
#define PLAY_Q_MASK (PLAY_Q_SIZE-1)
static struct snd_buffer *play_q[PLAY_Q_SIZE];
static int play_produce;
static int play_consume;
static int play_level;
/* buffers played, for application to collect */
static rtems_id play_q_done;
static void play_start(struct snd_buffer *buf)
{
if (buf->nsamples > (AC97_MAX_DMASIZE/4))
buf->nsamples = AC97_MAX_DMASIZE/4;
MM_WRITE(MM_AC97_DADDRESS, (unsigned int)buf->samples);
MM_WRITE(MM_AC97_DREMAINING, buf->nsamples*4);
MM_WRITE(MM_AC97_DCTL, AC97_SCTL_EN);
}
static rtems_isr pcmplay_handler(rtems_vector_number n)
{
lm32_interrupt_ack(1 << MM_IRQ_AC97DMAR);
rtems_message_queue_send(play_q_done, &play_q[play_consume],
sizeof(void *));
play_consume = (play_consume + 1) & PLAY_Q_MASK;
play_level--;
if(play_level > 0)
play_start(play_q[play_consume]);
else
MM_WRITE(MM_AC97_DCTL, 0);
}
/* queued record buffers */
#define RECORD_Q_SIZE 8
#define RECORD_Q_MASK (RECORD_Q_SIZE-1)
static struct snd_buffer *record_q[RECORD_Q_SIZE];
static int record_produce;
static int record_consume;
static int record_level;
/* buffers recorded, for application to collect */
static rtems_id record_q_done;
static void record_start(struct snd_buffer *buf)
{
if (buf->nsamples > (AC97_MAX_DMASIZE/4))
buf->nsamples = AC97_MAX_DMASIZE/4;
MM_WRITE(MM_AC97_UADDRESS, (unsigned int)buf->samples);
MM_WRITE(MM_AC97_UREMAINING, buf->nsamples*4);
MM_WRITE(MM_AC97_UCTL, AC97_SCTL_EN);
}
static rtems_isr pcmrecord_handler(rtems_vector_number n)
{
lm32_interrupt_ack(1 << MM_IRQ_AC97DMAW);
__asm__ volatile( /* Invalidate Level-1 data cache */
"wcsr DCC, r0\n"
"nop\n"
);
rtems_message_queue_send(record_q_done, &record_q[record_consume],
sizeof(void *));
record_consume = (record_consume + 1) & RECORD_Q_MASK;
record_level--;
if(record_level > 0)
record_start(record_q[record_consume]);
else
MM_WRITE(MM_AC97_UCTL, 0);
}
rtems_device_driver ac97_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code sc;
rtems_isr_entry dummy;
sc = rtems_io_register_name(SND_DEVICE_NAME, major, 0);
RTEMS_CHECK_SC(sc, "create snd device");
sc = rtems_io_register_name(MIXER_DEVICE_NAME, major, 1);
RTEMS_CHECK_SC(sc, "create mixer device");
sc = rtems_semaphore_create(
rtems_build_name('C', 'R', 'W', 'S'),
0,
RTEMS_SIMPLE_BINARY_SEMAPHORE,
0,
&cr_write_sem
);
RTEMS_CHECK_SC(sc, "create AC97 register write semaphore");
sc = rtems_semaphore_create(
rtems_build_name('C', 'R', 'R', 'S'),
0,
RTEMS_SIMPLE_BINARY_SEMAPHORE,
0,
&cr_read_sem
);
RTEMS_CHECK_SC(sc, "create AC97 register read semaphore");
sc = rtems_message_queue_create(
rtems_build_name('P', 'L', 'Y', 'Q'),
PLAY_Q_SIZE*2,
sizeof(void *),
0,
&play_q_done
);
RTEMS_CHECK_SC(sc, "create playback done queue");
sc = rtems_message_queue_create(
rtems_build_name('R', 'E', 'C', 'Q'),
RECORD_Q_SIZE*2,
sizeof(void *),
0,
&record_q_done
);
RTEMS_CHECK_SC(sc, "create record done queue");
rtems_interrupt_catch(crrequest_handler, MM_IRQ_AC97CRREQUEST, &dummy);
rtems_interrupt_catch(crreply_handler, MM_IRQ_AC97CRREPLY, &dummy);
rtems_interrupt_catch(pcmplay_handler, MM_IRQ_AC97DMAR, &dummy);
rtems_interrupt_catch(pcmrecord_handler, MM_IRQ_AC97DMAW, &dummy);
bsp_interrupt_vector_enable(MM_IRQ_AC97CRREQUEST);
bsp_interrupt_vector_enable(MM_IRQ_AC97CRREPLY);
bsp_interrupt_vector_enable(MM_IRQ_AC97DMAR);
bsp_interrupt_vector_enable(MM_IRQ_AC97DMAW);
play_produce = 0;
play_consume = 0;
play_level = 0;
record_produce = 0;
record_consume = 0;
record_level = 0;
return RTEMS_SUCCESSFUL;
}
static rtems_status_code submit_play(struct snd_buffer *buf)
{
bsp_interrupt_vector_disable(MM_IRQ_AC97DMAR);
if (play_level == PLAY_Q_SIZE) {
bsp_interrupt_vector_enable(MM_IRQ_AC97DMAR);
return RTEMS_UNSATISFIED;
}
play_q[play_produce] = buf;
play_produce = (play_produce + 1) & PLAY_Q_MASK;
play_level++;
if (play_level == 1)
play_start(buf);
bsp_interrupt_vector_enable(MM_IRQ_AC97DMAR);
return RTEMS_SUCCESSFUL;
}
static rtems_status_code collect_play(struct snd_buffer **buf)
{
size_t s;
return rtems_message_queue_receive(
play_q_done,
buf,
&s,
RTEMS_WAIT,
RTEMS_NO_TIMEOUT
);
}
static rtems_status_code submit_record(struct snd_buffer *buf)
{
bsp_interrupt_vector_disable(MM_IRQ_AC97DMAW);
if (record_level == RECORD_Q_SIZE) {
bsp_interrupt_vector_enable(MM_IRQ_AC97DMAW);
return RTEMS_UNSATISFIED;
}
record_q[record_produce] = buf;
record_produce = (record_produce + 1) & RECORD_Q_MASK;
record_level++;
if (record_level == 1)
record_start(buf);
bsp_interrupt_vector_enable(MM_IRQ_AC97DMAW);
return RTEMS_SUCCESSFUL;
}
static rtems_status_code collect_record(struct snd_buffer **buf)
{
size_t s;
return rtems_message_queue_receive(
record_q_done,
buf,
&s,
RTEMS_WAIT,
RTEMS_NO_TIMEOUT
);
}
#define CR_TIMEOUT 10
static int read_cr(unsigned int adr)
{
rtems_status_code sc;
MM_WRITE(MM_AC97_CRADDR, adr);
MM_WRITE(MM_AC97_CRCTL, AC97_CRCTL_RQEN);
sc = rtems_semaphore_obtain(cr_write_sem, RTEMS_WAIT, CR_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
return -1;
sc = rtems_semaphore_obtain(cr_read_sem, RTEMS_WAIT, CR_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
return -1;
return MM_READ(MM_AC97_CRDATAIN);
}
static int write_cr(unsigned int adr, unsigned int val)
{
rtems_status_code sc;
MM_WRITE(MM_AC97_CRADDR, adr);
MM_WRITE(MM_AC97_CRDATAOUT, val);
MM_WRITE(MM_AC97_CRCTL, AC97_CRCTL_RQEN|AC97_CRCTL_WRITE);
sc = rtems_semaphore_obtain(cr_write_sem, RTEMS_WAIT, CR_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
return 0;
return 1;
}
rtems_device_driver ac97_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
int codec_id;
if (minor == 0) {
/* snd */
return RTEMS_SUCCESSFUL;
} else {
/* mixer */
codec_id = read_cr(0x00);
if ((codec_id != 0x0d50) && (codec_id != 0x6150)) {
printk("AC97 codec detection failed\n");
return RTEMS_UNSATISFIED;
}
write_cr(0x02, 0x0000); /* master volume */
write_cr(0x04, 0x0f0f); /* headphones volume */
write_cr(0x18, 0x0000); /* PCM out volume */
write_cr(0x1c, 0x0f0f); /* record gain */
write_cr(0x1a, 0x0505); /* record select: stereo mix */
return RTEMS_SUCCESSFUL;
}
}
static rtems_status_code ioctl_read_channel(void *buf,
unsigned int chan, int mono)
{
unsigned int *val = (unsigned int *)buf;
int codec;
int left, right;
codec = read_cr(chan);
if (codec < 0)
return RTEMS_UNSATISFIED;
if (codec & 0x8000) {
/* muted */
*val = 0;
return RTEMS_SUCCESSFUL;
}
if (mono) {
right = left = 100-(((codec & 0x1f) + 1)*100)/32;
} else {
right = 100-(((codec & 0x1f) + 1)*100)/32;
left = 100-((((codec & 0x1f00) >> 8) + 1)*100)/32;
}
*val = left | (right << 8);
return RTEMS_SUCCESSFUL;
}
static rtems_status_code ioctl_write_channel(void *buf,
unsigned int chan, int mono)
{
unsigned int *val = (unsigned int *)buf;
int left, right;
int codec;
rtems_status_code sc;
left = *val & 0xff;
left = (left*32)/100 - 1;
if(left < 0)
left = 0;
if (mono)
right = 31;
else {
right = (*val >> 8) & 0xff;
right = (right*32)/100 - 1;
if(right < 0)
right = 0;
}
if ((left == 0) && (right == 0))
/* mute */
codec = 0x8000;
else
codec = (31-left) | ((31-right) << 8);
if (!write_cr(chan, codec))
sc = RTEMS_UNSATISFIED;
else
sc = RTEMS_SUCCESSFUL;
return sc;
}
rtems_device_driver ac97_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_libio_ioctl_args_t *args = arg;
rtems_status_code sc;
args->ioctl_return = -1;
if(minor == 0) {
/* dsp */
switch (args->command) {
case SOUND_SND_SUBMIT_PLAY:
return submit_play((struct snd_buffer *)args->buffer);
case SOUND_SND_COLLECT_PLAY:
return collect_play((struct snd_buffer **)args->buffer);
case SOUND_SND_SUBMIT_RECORD:
return submit_record((struct snd_buffer *)args->buffer);
case SOUND_SND_COLLECT_RECORD:
return collect_record((struct snd_buffer **)args->buffer);
default:
return RTEMS_UNSATISFIED;
}
} else {
/* mixer */
switch (args->command) {
case SOUND_MIXER_READ(SOUND_MIXER_MIC):
sc = ioctl_read_channel(args->buffer, 0x0e, 1);
if(sc == RTEMS_SUCCESSFUL)
args->ioctl_return = 0;
return sc;
case SOUND_MIXER_READ(SOUND_MIXER_LINE):
sc = ioctl_read_channel(args->buffer, 0x10, 0);
if(sc == RTEMS_SUCCESSFUL)
args->ioctl_return = 0;
return sc;
case SOUND_MIXER_WRITE(SOUND_MIXER_MIC):
sc = ioctl_write_channel(args->buffer, 0x0e, 1);
if(sc == RTEMS_SUCCESSFUL)
args->ioctl_return = 0;
return sc;
case SOUND_MIXER_WRITE(SOUND_MIXER_LINE):
sc = ioctl_write_channel(args->buffer, 0x10, 0);
if(sc == RTEMS_SUCCESSFUL)
args->ioctl_return = 0;
return sc;
default:
return RTEMS_UNSATISFIED;
}
}
}