forked from Imagelibrary/rtems
437 lines
10 KiB
C
437 lines
10 KiB
C
/* ac97.c
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*
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* Sound driver for Milkymist SoC
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*
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* COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq
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*/
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#define RTEMS_STATUS_CHECKS_USE_PRINTK
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#include <rtems.h>
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#include <bsp.h>
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#include <bsp/irq-generic.h>
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#include <rtems/libio.h>
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#include <rtems/status-checks.h>
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#include "../include/system_conf.h"
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#include <bsp/milkymist_ac97.h>
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#define SND_DEVICE_NAME "/dev/snd"
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#define MIXER_DEVICE_NAME "/dev/mixer"
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static rtems_id cr_write_sem;
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static rtems_id cr_read_sem;
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static rtems_isr crrequest_handler(rtems_vector_number n)
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{
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rtems_semaphore_release(cr_write_sem);
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lm32_interrupt_ack(1 << MM_IRQ_AC97CRREQUEST);
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}
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static rtems_isr crreply_handler(rtems_vector_number n)
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{
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rtems_semaphore_release(cr_read_sem);
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lm32_interrupt_ack(1 << MM_IRQ_AC97CRREPLY);
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}
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/* queued playback buffers */
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#define PLAY_Q_SIZE 8
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#define PLAY_Q_MASK (PLAY_Q_SIZE-1)
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static struct snd_buffer *play_q[PLAY_Q_SIZE];
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static int play_produce;
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static int play_consume;
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static int play_level;
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/* buffers played, for application to collect */
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static rtems_id play_q_done;
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static void play_start(struct snd_buffer *buf)
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{
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if (buf->nsamples > (AC97_MAX_DMASIZE/4))
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buf->nsamples = AC97_MAX_DMASIZE/4;
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MM_WRITE(MM_AC97_DADDRESS, (unsigned int)buf->samples);
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MM_WRITE(MM_AC97_DREMAINING, buf->nsamples*4);
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MM_WRITE(MM_AC97_DCTL, AC97_SCTL_EN);
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}
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static rtems_isr pcmplay_handler(rtems_vector_number n)
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{
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lm32_interrupt_ack(1 << MM_IRQ_AC97DMAR);
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rtems_message_queue_send(play_q_done, &play_q[play_consume],
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sizeof(void *));
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play_consume = (play_consume + 1) & PLAY_Q_MASK;
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play_level--;
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if(play_level > 0)
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play_start(play_q[play_consume]);
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else
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MM_WRITE(MM_AC97_DCTL, 0);
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}
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/* queued record buffers */
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#define RECORD_Q_SIZE 8
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#define RECORD_Q_MASK (RECORD_Q_SIZE-1)
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static struct snd_buffer *record_q[RECORD_Q_SIZE];
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static int record_produce;
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static int record_consume;
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static int record_level;
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/* buffers recorded, for application to collect */
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static rtems_id record_q_done;
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static void record_start(struct snd_buffer *buf)
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{
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if (buf->nsamples > (AC97_MAX_DMASIZE/4))
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buf->nsamples = AC97_MAX_DMASIZE/4;
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MM_WRITE(MM_AC97_UADDRESS, (unsigned int)buf->samples);
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MM_WRITE(MM_AC97_UREMAINING, buf->nsamples*4);
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MM_WRITE(MM_AC97_UCTL, AC97_SCTL_EN);
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}
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static rtems_isr pcmrecord_handler(rtems_vector_number n)
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{
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lm32_interrupt_ack(1 << MM_IRQ_AC97DMAW);
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__asm__ volatile( /* Invalidate Level-1 data cache */
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"wcsr DCC, r0\n"
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"nop\n"
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);
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rtems_message_queue_send(record_q_done, &record_q[record_consume],
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sizeof(void *));
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record_consume = (record_consume + 1) & RECORD_Q_MASK;
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record_level--;
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if(record_level > 0)
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record_start(record_q[record_consume]);
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else
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MM_WRITE(MM_AC97_UCTL, 0);
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}
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rtems_device_driver ac97_initialize(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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rtems_status_code sc;
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rtems_isr_entry dummy;
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sc = rtems_io_register_name(SND_DEVICE_NAME, major, 0);
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RTEMS_CHECK_SC(sc, "create snd device");
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sc = rtems_io_register_name(MIXER_DEVICE_NAME, major, 1);
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RTEMS_CHECK_SC(sc, "create mixer device");
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sc = rtems_semaphore_create(
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rtems_build_name('C', 'R', 'W', 'S'),
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0,
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RTEMS_SIMPLE_BINARY_SEMAPHORE,
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0,
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&cr_write_sem
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);
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RTEMS_CHECK_SC(sc, "create AC97 register write semaphore");
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sc = rtems_semaphore_create(
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rtems_build_name('C', 'R', 'R', 'S'),
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0,
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RTEMS_SIMPLE_BINARY_SEMAPHORE,
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0,
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&cr_read_sem
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);
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RTEMS_CHECK_SC(sc, "create AC97 register read semaphore");
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sc = rtems_message_queue_create(
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rtems_build_name('P', 'L', 'Y', 'Q'),
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PLAY_Q_SIZE*2,
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sizeof(void *),
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0,
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&play_q_done
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);
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RTEMS_CHECK_SC(sc, "create playback done queue");
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sc = rtems_message_queue_create(
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rtems_build_name('R', 'E', 'C', 'Q'),
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RECORD_Q_SIZE*2,
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sizeof(void *),
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0,
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&record_q_done
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);
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RTEMS_CHECK_SC(sc, "create record done queue");
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rtems_interrupt_catch(crrequest_handler, MM_IRQ_AC97CRREQUEST, &dummy);
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rtems_interrupt_catch(crreply_handler, MM_IRQ_AC97CRREPLY, &dummy);
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rtems_interrupt_catch(pcmplay_handler, MM_IRQ_AC97DMAR, &dummy);
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rtems_interrupt_catch(pcmrecord_handler, MM_IRQ_AC97DMAW, &dummy);
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bsp_interrupt_vector_enable(MM_IRQ_AC97CRREQUEST);
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bsp_interrupt_vector_enable(MM_IRQ_AC97CRREPLY);
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bsp_interrupt_vector_enable(MM_IRQ_AC97DMAR);
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bsp_interrupt_vector_enable(MM_IRQ_AC97DMAW);
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play_produce = 0;
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play_consume = 0;
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play_level = 0;
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record_produce = 0;
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record_consume = 0;
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record_level = 0;
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return RTEMS_SUCCESSFUL;
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}
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static rtems_status_code submit_play(struct snd_buffer *buf)
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{
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bsp_interrupt_vector_disable(MM_IRQ_AC97DMAR);
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if (play_level == PLAY_Q_SIZE) {
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bsp_interrupt_vector_enable(MM_IRQ_AC97DMAR);
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return RTEMS_UNSATISFIED;
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}
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play_q[play_produce] = buf;
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play_produce = (play_produce + 1) & PLAY_Q_MASK;
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play_level++;
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if (play_level == 1)
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play_start(buf);
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bsp_interrupt_vector_enable(MM_IRQ_AC97DMAR);
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return RTEMS_SUCCESSFUL;
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}
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static rtems_status_code collect_play(struct snd_buffer **buf)
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{
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size_t s;
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return rtems_message_queue_receive(
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play_q_done,
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buf,
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&s,
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RTEMS_WAIT,
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RTEMS_NO_TIMEOUT
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);
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}
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static rtems_status_code submit_record(struct snd_buffer *buf)
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{
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bsp_interrupt_vector_disable(MM_IRQ_AC97DMAW);
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if (record_level == RECORD_Q_SIZE) {
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bsp_interrupt_vector_enable(MM_IRQ_AC97DMAW);
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return RTEMS_UNSATISFIED;
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}
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record_q[record_produce] = buf;
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record_produce = (record_produce + 1) & RECORD_Q_MASK;
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record_level++;
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if (record_level == 1)
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record_start(buf);
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bsp_interrupt_vector_enable(MM_IRQ_AC97DMAW);
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return RTEMS_SUCCESSFUL;
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}
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static rtems_status_code collect_record(struct snd_buffer **buf)
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{
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size_t s;
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return rtems_message_queue_receive(
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record_q_done,
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buf,
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&s,
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RTEMS_WAIT,
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RTEMS_NO_TIMEOUT
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);
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}
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#define CR_TIMEOUT 10
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static int read_cr(unsigned int adr)
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{
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rtems_status_code sc;
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MM_WRITE(MM_AC97_CRADDR, adr);
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MM_WRITE(MM_AC97_CRCTL, AC97_CRCTL_RQEN);
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sc = rtems_semaphore_obtain(cr_write_sem, RTEMS_WAIT, CR_TIMEOUT);
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if (sc != RTEMS_SUCCESSFUL)
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return -1;
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sc = rtems_semaphore_obtain(cr_read_sem, RTEMS_WAIT, CR_TIMEOUT);
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if (sc != RTEMS_SUCCESSFUL)
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return -1;
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return MM_READ(MM_AC97_CRDATAIN);
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}
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static int write_cr(unsigned int adr, unsigned int val)
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{
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rtems_status_code sc;
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MM_WRITE(MM_AC97_CRADDR, adr);
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MM_WRITE(MM_AC97_CRDATAOUT, val);
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MM_WRITE(MM_AC97_CRCTL, AC97_CRCTL_RQEN|AC97_CRCTL_WRITE);
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sc = rtems_semaphore_obtain(cr_write_sem, RTEMS_WAIT, CR_TIMEOUT);
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if (sc != RTEMS_SUCCESSFUL)
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return 0;
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return 1;
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}
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rtems_device_driver ac97_open(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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int codec_id;
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if (minor == 0) {
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/* snd */
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return RTEMS_SUCCESSFUL;
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} else {
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/* mixer */
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codec_id = read_cr(0x00);
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if ((codec_id != 0x0d50) && (codec_id != 0x6150)) {
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printk("AC97 codec detection failed\n");
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return RTEMS_UNSATISFIED;
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}
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write_cr(0x02, 0x0000); /* master volume */
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write_cr(0x04, 0x0f0f); /* headphones volume */
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write_cr(0x18, 0x0000); /* PCM out volume */
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write_cr(0x1c, 0x0f0f); /* record gain */
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write_cr(0x1a, 0x0505); /* record select: stereo mix */
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return RTEMS_SUCCESSFUL;
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}
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}
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static rtems_status_code ioctl_read_channel(void *buf,
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unsigned int chan, int mono)
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{
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unsigned int *val = (unsigned int *)buf;
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int mic_boost;
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int codec;
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int left, right;
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codec = read_cr(chan);
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if (codec < 0)
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return RTEMS_UNSATISFIED;
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if (codec & 0x8000) {
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/* muted */
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*val = 0;
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return RTEMS_SUCCESSFUL;
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}
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if (mono) {
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left = 100-(((codec & 0x1f) + 1)*100)/32;
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mic_boost = (codec & (1 << 6)) >> 6;
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*val = left | mic_boost << 8;
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} else {
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right = 100-(((codec & 0x1f) + 1)*100)/32;
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left = 100-((((codec & 0x1f00) >> 8) + 1)*100)/32;
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*val = left | (right << 8);
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}
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return RTEMS_SUCCESSFUL;
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}
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static rtems_status_code ioctl_write_channel(void *buf,
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unsigned int chan, int mono)
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{
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unsigned int *val = (unsigned int *)buf;
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int mic_boost;
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int left, right;
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int codec;
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rtems_status_code sc;
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left = *val & 0xff;
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left = (left*32)/100 - 1;
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if (left < 0)
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left = 0;
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if (mono) {
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mic_boost = *val >> 8;
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right = 31;
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} else {
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right = (*val >> 8) & 0xff;
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right = (right*32)/100 - 1;
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if (right < 0)
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right = 0;
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}
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if ((left == 0) && (right == 0))
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/* mute */
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codec = 0x8000;
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else
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codec = (31-left) | ((31-right) << 8);
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if (mono) {
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if (mic_boost)
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codec |= (1 << 6);
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else
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codec &= ~(1 << 6);
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}
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if (!write_cr(chan, codec))
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sc = RTEMS_UNSATISFIED;
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else
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sc = RTEMS_SUCCESSFUL;
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return sc;
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}
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rtems_device_driver ac97_control(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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rtems_libio_ioctl_args_t *args = arg;
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rtems_status_code sc;
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args->ioctl_return = -1;
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if(minor == 0) {
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/* dsp */
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switch (args->command) {
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case SOUND_SND_SUBMIT_PLAY:
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return submit_play((struct snd_buffer *)args->buffer);
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case SOUND_SND_COLLECT_PLAY:
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return collect_play((struct snd_buffer **)args->buffer);
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case SOUND_SND_SUBMIT_RECORD:
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return submit_record((struct snd_buffer *)args->buffer);
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case SOUND_SND_COLLECT_RECORD:
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return collect_record((struct snd_buffer **)args->buffer);
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default:
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return RTEMS_UNSATISFIED;
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}
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} else {
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/* mixer */
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switch (args->command) {
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case SOUND_MIXER_READ(SOUND_MIXER_MIC):
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sc = ioctl_read_channel(args->buffer, 0x0e, 1);
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if(sc == RTEMS_SUCCESSFUL)
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args->ioctl_return = 0;
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return sc;
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case SOUND_MIXER_READ(SOUND_MIXER_LINE):
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sc = ioctl_read_channel(args->buffer, 0x10, 0);
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if(sc == RTEMS_SUCCESSFUL)
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args->ioctl_return = 0;
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return sc;
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case SOUND_MIXER_WRITE(SOUND_MIXER_MIC):
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sc = ioctl_write_channel(args->buffer, 0x0e, 1);
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if(sc == RTEMS_SUCCESSFUL)
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args->ioctl_return = 0;
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return sc;
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case SOUND_MIXER_WRITE(SOUND_MIXER_LINE):
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sc = ioctl_write_channel(args->buffer, 0x10, 0);
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if(sc == RTEMS_SUCCESSFUL)
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args->ioctl_return = 0;
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return sc;
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default:
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return RTEMS_UNSATISFIED;
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}
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}
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}
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