[ALSA] au1x00 - Code clean up
Modules: MIPS AU1x00 driver
Clean up snd-au1x00 driver code:
- Remove global variables
- Remove old compatibility codes
- Fix DMA-link allocation/release functions in hw_params and hw_free
callbacks (they may be called multiple times)
- Fix spinlocks
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/mips/au1x00.c b/sound/mips/au1x00.c
index d08a42b..a8f9a3b 100644
--- a/sound/mips/au1x00.c
+++ b/sound/mips/au1x00.c
@@ -50,12 +50,7 @@
MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
MODULE_LICENSE("GPL");
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
-#else
-MODULE_CLASSES("{sound}");
-MODULE_DEVICES("{{AMD,Au1000 AC'97}}");
-#endif
#define PLAYBACK 0
#define CAPTURE 1
@@ -68,8 +63,6 @@
#define READ_WAIT 2
#define RW_DONE 3
-DECLARE_WAIT_QUEUE_HEAD(ac97_command_wq);
-
typedef struct au1000_period au1000_period_t;
struct au1000_period
{
@@ -94,7 +87,8 @@
int dma;
spinlock_t dma_lock;
au1000_period_t * buffer;
- unsigned long period_size;
+ unsigned int period_size;
+ unsigned int periods;
};
typedef struct snd_card_au1000 {
@@ -109,11 +103,9 @@
audio_stream_t *stream[2]; /* playback & capture */
} au1000_t;
-static au1000_t *au1000 = NULL;
-
/*--------------------------- Local Functions --------------------------------*/
static void
-au1000_set_ac97_xmit_slots(long xmit_slots)
+au1000_set_ac97_xmit_slots(au1000_t *au1000, long xmit_slots)
{
u32 volatile ac97_config;
@@ -126,7 +118,7 @@
}
static void
-au1000_set_ac97_recv_slots(long recv_slots)
+au1000_set_ac97_recv_slots(au1000_t *au1000, long recv_slots)
{
u32 volatile ac97_config;
@@ -140,79 +132,92 @@
static void
-au1000_dma_stop(audio_stream_t *stream)
+au1000_release_dma_link(audio_stream_t *stream)
{
- unsigned long flags;
au1000_period_t * pointer;
au1000_period_t * pointer_next;
- if (stream->buffer != NULL) {
- spin_lock_irqsave(&stream->dma_lock, flags);
- disable_dma(stream->dma);
- spin_unlock_irqrestore(&stream->dma_lock, flags);
+ stream->period_size = 0;
+ stream->periods = 0;
+ pointer = stream->buffer;
+ if (! pointer)
+ return;
+ do {
+ pointer_next = pointer->next;
+ kfree(pointer);
+ pointer = pointer_next;
+ } while (pointer != stream->buffer);
+ stream->buffer = NULL;
+}
- pointer = stream->buffer;
- pointer_next = stream->buffer->next;
+static int
+au1000_setup_dma_link(audio_stream_t *stream, unsigned int period_bytes,
+ unsigned int periods)
+{
+ snd_pcm_substream_t *substream = stream->substream;
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ unsigned long dma_start;
+ int i;
- do {
- kfree(pointer);
- pointer = pointer_next;
- pointer_next = pointer->next;
- } while (pointer != stream->buffer);
+ dma_start = virt_to_phys(runtime->dma_area);
- stream->buffer = NULL;
+ if (stream->period_size == period_bytes &&
+ stream->periods == periods)
+ return 0; /* not changed */
+
+ au1000_release_dma_link(stream);
+
+ stream->period_size = period_bytes;
+ stream->periods = periods;
+
+ stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL);
+ if (! stream->buffer)
+ return -ENOMEM;
+ pointer = stream->buffer;
+ for (i = 0; i < periods; i++) {
+ pointer->start = (u32)(dma_start + (i * period_bytes));
+ pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
+ if (i < periods - 1) {
+ pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
+ if (! pointer->next) {
+ au1000_release_dma_link(stream);
+ return -ENOMEM;
+ }
+ pointer = pointer->next;
+ }
}
+ pointer->next = stream->buffer;
+ return 0;
+}
+
+static void
+au1000_dma_stop(audio_stream_t *stream)
+{
+ snd_assert(stream->buffer, return);
+ disable_dma(stream->dma);
}
static void
au1000_dma_start(audio_stream_t *stream)
{
- snd_pcm_substream_t *substream = stream->substream;
- snd_pcm_runtime_t *runtime = substream->runtime;
+ snd_assert(stream->buffer, return);
- unsigned long flags, dma_start;
- int i;
- au1000_period_t * pointer;
-
- if (stream->buffer == NULL) {
- dma_start = virt_to_phys(runtime->dma_area);
-
- stream->period_size = frames_to_bytes(runtime,
- runtime->period_size);
- stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL);
- pointer = stream->buffer;
- for (i = 0 ; i < runtime->periods ; i++) {
- pointer->start = (u32)(dma_start +
- (i * stream->period_size));
- pointer->relative_end = (u32)
- (((i+1) * stream->period_size) - 0x1);
- if ( i < runtime->periods - 1) {
- pointer->next = kmalloc(sizeof(au1000_period_t)
- , GFP_KERNEL);
- pointer = pointer->next;
- }
- }
- pointer->next = stream->buffer;
-
- spin_lock_irqsave(&stream->dma_lock, flags);
- init_dma(stream->dma);
- if (get_dma_active_buffer(stream->dma) == 0) {
- clear_dma_done0(stream->dma);
- set_dma_addr0(stream->dma, stream->buffer->start);
- set_dma_count0(stream->dma, stream->period_size >> 1);
- set_dma_addr1(stream->dma, stream->buffer->next->start);
- set_dma_count1(stream->dma, stream->period_size >> 1);
- } else {
- clear_dma_done1(stream->dma);
- set_dma_addr1(stream->dma, stream->buffer->start);
- set_dma_count1(stream->dma, stream->period_size >> 1);
- set_dma_addr0(stream->dma, stream->buffer->next->start);
- set_dma_count0(stream->dma, stream->period_size >> 1);
- }
- enable_dma_buffers(stream->dma);
- start_dma(stream->dma);
- spin_unlock_irqrestore(&stream->dma_lock, flags);
+ init_dma(stream->dma);
+ if (get_dma_active_buffer(stream->dma) == 0) {
+ clear_dma_done0(stream->dma);
+ set_dma_addr0(stream->dma, stream->buffer->start);
+ set_dma_count0(stream->dma, stream->period_size >> 1);
+ set_dma_addr1(stream->dma, stream->buffer->next->start);
+ set_dma_count1(stream->dma, stream->period_size >> 1);
+ } else {
+ clear_dma_done1(stream->dma);
+ set_dma_addr1(stream->dma, stream->buffer->start);
+ set_dma_count1(stream->dma, stream->period_size >> 1);
+ set_dma_addr0(stream->dma, stream->buffer->next->start);
+ set_dma_count0(stream->dma, stream->period_size >> 1);
}
+ enable_dma_buffers(stream->dma);
+ start_dma(stream->dma);
}
static irqreturn_t
@@ -238,11 +243,9 @@
enable_dma_buffer1(stream->dma);
break;
case (DMA_D0 | DMA_D1):
- spin_unlock(&stream->dma_lock);
printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
au1000_dma_stop(stream);
au1000_dma_start(stream);
- spin_lock(&stream->dma_lock);
break;
case (~DMA_D0 & ~DMA_D1):
printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
@@ -261,7 +264,7 @@
.mask = 0,
};
-static snd_pcm_hardware_t snd_au1000 =
+static snd_pcm_hardware_t snd_au1000_hw =
{
.info = (SNDRV_PCM_INFO_INTERLEAVED | \
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
@@ -283,10 +286,12 @@
static int
snd_au1000_playback_open(snd_pcm_substream_t * substream)
{
+ au1000_t *au1000 = substream->pcm->private_data;
+
au1000->stream[PLAYBACK]->substream = substream;
au1000->stream[PLAYBACK]->buffer = NULL;
substream->private_data = au1000->stream[PLAYBACK];
- substream->runtime->hw = snd_au1000;
+ substream->runtime->hw = snd_au1000_hw;
return (snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
}
@@ -294,10 +299,12 @@
static int
snd_au1000_capture_open(snd_pcm_substream_t * substream)
{
+ au1000_t *au1000 = substream->pcm->private_data;
+
au1000->stream[CAPTURE]->substream = substream;
au1000->stream[CAPTURE]->buffer = NULL;
substream->private_data = au1000->stream[CAPTURE];
- substream->runtime->hw = snd_au1000;
+ substream->runtime->hw = snd_au1000_hw;
return (snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
@@ -306,6 +313,8 @@
static int
snd_au1000_playback_close(snd_pcm_substream_t * substream)
{
+ au1000_t *au1000 = substream->pcm->private_data;
+
au1000->stream[PLAYBACK]->substream = NULL;
return 0;
}
@@ -313,6 +322,8 @@
static int
snd_au1000_capture_close(snd_pcm_substream_t * substream)
{
+ au1000_t *au1000 = substream->pcm->private_data;
+
au1000->stream[CAPTURE]->substream = NULL;
return 0;
}
@@ -321,25 +332,36 @@
snd_au1000_hw_params(snd_pcm_substream_t * substream,
snd_pcm_hw_params_t * hw_params)
{
- return snd_pcm_lib_malloc_pages(substream,
- params_buffer_bytes(hw_params));
+ audio_stream_t *stream = substream->private_data;
+ int err;
+
+ err = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ if (err < 0)
+ return err;
+ return au1000_setup_dma_link(stream,
+ params_period_bytes(hw_params),
+ params_periods(hw_params));
}
static int
snd_au1000_hw_free(snd_pcm_substream_t * substream)
{
+ audio_stream_t *stream = substream->private_data;
+ au1000_release_dma_link(stream);
return snd_pcm_lib_free_pages(substream);
}
static int
snd_au1000_playback_prepare(snd_pcm_substream_t * substream)
{
+ au1000_t *au1000 = substream->pcm->private_data;
snd_pcm_runtime_t *runtime = substream->runtime;
- if (runtime->channels == 1 )
- au1000_set_ac97_xmit_slots(AC97_SLOT_4);
+ if (runtime->channels == 1)
+ au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
else
- au1000_set_ac97_xmit_slots(AC97_SLOT_3 | AC97_SLOT_4);
+ au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
return 0;
}
@@ -347,12 +369,13 @@
static int
snd_au1000_capture_prepare(snd_pcm_substream_t * substream)
{
+ au1000_t *au1000 = substream->pcm->private_data;
snd_pcm_runtime_t *runtime = substream->runtime;
- if (runtime->channels == 1 )
- au1000_set_ac97_recv_slots(AC97_SLOT_4);
+ if (runtime->channels == 1)
+ au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
else
- au1000_set_ac97_recv_slots(AC97_SLOT_3 | AC97_SLOT_4);
+ au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
return 0;
}
@@ -363,6 +386,7 @@
audio_stream_t *stream = substream->private_data;
int err = 0;
+ spin_lock(&stream->dma_lock);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
au1000_dma_start(stream);
@@ -374,6 +398,7 @@
err = -EINVAL;
break;
}
+ spin_unlock(&stream->dma_lock);
return err;
}
@@ -382,12 +407,11 @@
{
audio_stream_t *stream = substream->private_data;
snd_pcm_runtime_t *runtime = substream->runtime;
- unsigned long flags;
long location;
- spin_lock_irqsave(&stream->dma_lock, flags);
+ spin_lock(&stream->dma_lock);
location = get_dma_residue(stream->dma);
- spin_unlock_irqrestore(&stream->dma_lock, flags);
+ spin_unlock(&stream->dma_lock);
location = stream->buffer->relative_end - location;
if (location == -1)
location = 0;
@@ -438,6 +462,9 @@
pcm->info_flags = 0;
strcpy(pcm->name, "Au1000 AC97 PCM");
+ spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
+ spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
+
flags = claim_dma_lock();
if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
"AC97 TX", au1000_dma_interrupt, SA_INTERRUPT,
@@ -457,8 +484,6 @@
set_dma_mode(au1000->stream[CAPTURE]->dma,
get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
release_dma_lock(flags);
- spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
- spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
au1000->pcm = pcm;
return 0;
}
@@ -469,9 +494,11 @@
static unsigned short
snd_au1000_ac97_read(ac97_t *ac97, unsigned short reg)
{
+ au1000_t *au1000 = ac97->private_data;
u32 volatile cmd;
u16 volatile data;
int i;
+
spin_lock(&au1000->ac97_lock);
/* would rather use the interupt than this polling but it works and I can't
get the interupt driven case to work efficiently */
@@ -505,8 +532,10 @@
static void
snd_au1000_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
{
+ au1000_t *au1000 = ac97->private_data;
u32 cmd;
int i;
+
spin_lock(&au1000->ac97_lock);
/* would rather use the interupt than this polling but it works and I can't
get the interupt driven case to work efficiently */
@@ -522,28 +551,13 @@
au1000->ac97_ioport->cmd = cmd;
spin_unlock(&au1000->ac97_lock);
}
-static void
-snd_au1000_ac97_free(ac97_t *ac97)
-{
- au1000->ac97 = NULL;
-}
static int __devinit
-snd_au1000_ac97_new(void)
+snd_au1000_ac97_new(au1000_t *au1000)
{
int err;
-
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
- ac97_bus_t *pbus;
- ac97_template_t ac97;
- static ac97_bus_ops_t ops = {
- .write = snd_au1000_ac97_write,
- .read = snd_au1000_ac97_read,
- };
-#else
ac97_bus_t bus, *pbus;
ac97_t ac97;
-#endif
if ((au1000->ac97_res_port = request_region(AC97C_CONFIG,
sizeof(au1000_ac97_reg_t), "Au1x00 AC97")) == NULL) {
@@ -554,8 +568,6 @@
spin_lock_init(&au1000->ac97_lock);
- spin_lock(&au1000->ac97_lock);
-
/* configure pins for AC'97
TODO: move to board_setup.c */
au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
@@ -572,26 +584,16 @@
au1000->ac97_ioport->config = 0x0;
mdelay(5);
- spin_unlock(&au1000->ac97_lock);
-
/* Initialise AC97 middle-layer */
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
return err;
-#else
- memset(&bus, 0, sizeof(bus));
- bus.write = snd_au1000_ac97_write;
- bus.read = snd_au1000_ac97_read;
- if ((err = snd_ac97_bus(au1000->card, &bus, &pbus)) < 0)
- return err;
-#endif
+
memset(&ac97, 0, sizeof(ac97));
ac97.private_data = au1000;
- ac97.private_free = snd_au1000_ac97_free;
if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
return err;
- return 0;
+ return 0;
}
/*------------------------------ Setup / Destroy ----------------------------*/
@@ -599,6 +601,7 @@
void
snd_au1000_free(snd_card_t *card)
{
+ au1000_t *au1000 = card->private_data;
if (au1000->ac97_res_port) {
/* put internal AC97 block into reset */
@@ -614,73 +617,70 @@
free_au1000_dma(au1000->stream[CAPTURE]->dma);
kfree(au1000->stream[PLAYBACK]);
- au1000->stream[PLAYBACK] = NULL;
kfree(au1000->stream[CAPTURE]);
- au1000->stream[CAPTURE] = NULL;
- kfree(au1000);
- au1000 = NULL;
-
}
+
+static snd_card_t *au1000_card;
+
static int __init
au1000_init(void)
{
int err;
+ snd_card_t *card;
+ au1000_t *au1000;
- au1000 = kmalloc(sizeof(au1000_t), GFP_KERNEL);
- if (au1000 == NULL)
+ card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
+ if (card == NULL)
return -ENOMEM;
- au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
- if (au1000->stream[PLAYBACK] == NULL)
- return -ENOMEM;
- au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
- if (au1000->stream[CAPTURE] == NULL)
- return -ENOMEM;
+
+ card->private_free = snd_au1000_free;
+ au1000 = card->private_data;
/* so that snd_au1000_free will work as intended */
+ au1000->card = card;
au1000->stream[PLAYBACK]->dma = -1;
au1000->stream[CAPTURE]->dma = -1;
au1000->ac97_res_port = NULL;
-
- au1000->card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
- if (au1000->card == NULL) {
- snd_au1000_free(au1000->card);
+ au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
+ au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
+ if (au1000->stream[PLAYBACK] == NULL ||
+ au1000->stream[CAPTURE] == NULL) {
+ snd_card_free(card);
return -ENOMEM;
}
- au1000->card->private_data = (au1000_t *)au1000;
- au1000->card->private_free = snd_au1000_free;
-
- if ((err = snd_au1000_ac97_new()) < 0 ) {
- snd_card_free(au1000->card);
+ if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
+ snd_card_free(card);
return err;
}
- if ((err = snd_au1000_pcm_new()) < 0) {
- snd_card_free(au1000->card);
+ if ((err = snd_au1000_pcm_new(au1000)) < 0) {
+ snd_card_free(card);
return err;
}
- strcpy(au1000->card->driver, "AMD-Au1000-AC97");
- strcpy(au1000->card->shortname, "Au1000-AC97");
- sprintf(au1000->card->longname, "AMD Au1000--AC97 ALSA Driver");
+ strcpy(card->driver, "Au1000-AC97");
+ strcpy(card->shortname, "AMD Au1000-AC97");
+ sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
- if ((err = snd_card_set_generic_dev(au1000->card)) < 0) {
- snd_card_free(au1000->card);
+ if ((err = snd_card_set_generic_dev(card)) < 0) {
+ snd_card_free(card);
return err;
}
- if ((err = snd_card_register(au1000->card)) < 0) {
- snd_card_free(au1000->card);
+ if ((err = snd_card_register(card)) < 0) {
+ snd_card_free(card);
return err;
}
printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
+ au1000_card = card;
return 0;
}
static void __exit au1000_exit(void)
{
- snd_card_free(au1000->card);
+ snd_card_free(au1000_card);
}
module_init(au1000_init);