443 lines
11 KiB
C
443 lines
11 KiB
C
|
/*
|
||
|
|
* PCM timer handling on ctxfi
|
||
|
|
*
|
||
|
|
* This source file is released under GPL v2 license (no other versions).
|
||
|
|
* See the COPYING file included in the main directory of this source
|
||
|
|
* distribution for the license terms and conditions.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/math64.h>
|
||
|
|
#include <linux/moduleparam.h>
|
||
|
|
#include <sound/core.h>
|
||
|
|
#include <sound/pcm.h>
|
||
|
|
#include "ctatc.h"
|
||
|
|
#include "cthardware.h"
|
||
|
|
#include "cttimer.h"
|
||
|
|
|
||
|
|
static bool use_system_timer;
|
||
|
|
MODULE_PARM_DESC(use_system_timer, "Force to use system-timer");
|
||
|
|
module_param(use_system_timer, bool, S_IRUGO);
|
||
|
|
|
||
|
|
struct ct_timer_ops {
|
||
|
|
void (*init)(struct ct_timer_instance *);
|
||
|
|
void (*prepare)(struct ct_timer_instance *);
|
||
|
|
void (*start)(struct ct_timer_instance *);
|
||
|
|
void (*stop)(struct ct_timer_instance *);
|
||
|
|
void (*free_instance)(struct ct_timer_instance *);
|
||
|
|
void (*interrupt)(struct ct_timer *);
|
||
|
|
void (*free_global)(struct ct_timer *);
|
||
|
|
};
|
||
|
|
|
||
|
|
/* timer instance -- assigned to each PCM stream */
|
||
|
|
struct ct_timer_instance {
|
||
|
|
spinlock_t lock;
|
||
|
|
struct ct_timer *timer_base;
|
||
|
|
struct ct_atc_pcm *apcm;
|
||
|
|
struct snd_pcm_substream *substream;
|
||
|
|
struct timer_list timer;
|
||
|
|
struct list_head instance_list;
|
||
|
|
struct list_head running_list;
|
||
|
|
unsigned int position;
|
||
|
|
unsigned int frag_count;
|
||
|
|
unsigned int running:1;
|
||
|
|
unsigned int need_update:1;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* timer instance manager */
|
||
|
|
struct ct_timer {
|
||
|
|
spinlock_t lock; /* global timer lock (for xfitimer) */
|
||
|
|
spinlock_t list_lock; /* lock for instance list */
|
||
|
|
struct ct_atc *atc;
|
||
|
|
const struct ct_timer_ops *ops;
|
||
|
|
struct list_head instance_head;
|
||
|
|
struct list_head running_head;
|
||
|
|
unsigned int wc; /* current wallclock */
|
||
|
|
unsigned int irq_handling:1; /* in IRQ handling */
|
||
|
|
unsigned int reprogram:1; /* need to reprogram the internval */
|
||
|
|
unsigned int running:1; /* global timer running */
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* system-timer-based updates
|
||
|
|
*/
|
||
|
|
|
||
|
|
static void ct_systimer_callback(struct timer_list *t)
|
||
|
|
{
|
||
|
|
struct ct_timer_instance *ti = from_timer(ti, t, timer);
|
||
|
|
struct snd_pcm_substream *substream = ti->substream;
|
||
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
|
struct ct_atc_pcm *apcm = ti->apcm;
|
||
|
|
unsigned int period_size = runtime->period_size;
|
||
|
|
unsigned int buffer_size = runtime->buffer_size;
|
||
|
|
unsigned long flags;
|
||
|
|
unsigned int position, dist, interval;
|
||
|
|
|
||
|
|
position = substream->ops->pointer(substream);
|
||
|
|
dist = (position + buffer_size - ti->position) % buffer_size;
|
||
|
|
if (dist >= period_size ||
|
||
|
|
position / period_size != ti->position / period_size) {
|
||
|
|
apcm->interrupt(apcm);
|
||
|
|
ti->position = position;
|
||
|
|
}
|
||
|
|
/* Add extra HZ*5/1000 to avoid overrun issue when recording
|
||
|
|
* at 8kHz in 8-bit format or at 88kHz in 24-bit format. */
|
||
|
|
interval = ((period_size - (position % period_size))
|
||
|
|
* HZ + (runtime->rate - 1)) / runtime->rate + HZ * 5 / 1000;
|
||
|
|
spin_lock_irqsave(&ti->lock, flags);
|
||
|
|
if (ti->running)
|
||
|
|
mod_timer(&ti->timer, jiffies + interval);
|
||
|
|
spin_unlock_irqrestore(&ti->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ct_systimer_init(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
timer_setup(&ti->timer, ct_systimer_callback, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ct_systimer_start(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
struct snd_pcm_runtime *runtime = ti->substream->runtime;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&ti->lock, flags);
|
||
|
|
ti->running = 1;
|
||
|
|
mod_timer(&ti->timer,
|
||
|
|
jiffies + (runtime->period_size * HZ +
|
||
|
|
(runtime->rate - 1)) / runtime->rate);
|
||
|
|
spin_unlock_irqrestore(&ti->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ct_systimer_stop(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&ti->lock, flags);
|
||
|
|
ti->running = 0;
|
||
|
|
del_timer(&ti->timer);
|
||
|
|
spin_unlock_irqrestore(&ti->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ct_systimer_prepare(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
ct_systimer_stop(ti);
|
||
|
|
try_to_del_timer_sync(&ti->timer);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define ct_systimer_free ct_systimer_prepare
|
||
|
|
|
||
|
|
static const struct ct_timer_ops ct_systimer_ops = {
|
||
|
|
.init = ct_systimer_init,
|
||
|
|
.free_instance = ct_systimer_free,
|
||
|
|
.prepare = ct_systimer_prepare,
|
||
|
|
.start = ct_systimer_start,
|
||
|
|
.stop = ct_systimer_stop,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Handling multiple streams using a global emu20k1 timer irq
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define CT_TIMER_FREQ 48000
|
||
|
|
#define MIN_TICKS 1
|
||
|
|
#define MAX_TICKS ((1 << 13) - 1)
|
||
|
|
|
||
|
|
static void ct_xfitimer_irq_rearm(struct ct_timer *atimer, int ticks)
|
||
|
|
{
|
||
|
|
struct hw *hw = atimer->atc->hw;
|
||
|
|
if (ticks > MAX_TICKS)
|
||
|
|
ticks = MAX_TICKS;
|
||
|
|
hw->set_timer_tick(hw, ticks);
|
||
|
|
if (!atimer->running)
|
||
|
|
hw->set_timer_irq(hw, 1);
|
||
|
|
atimer->running = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ct_xfitimer_irq_stop(struct ct_timer *atimer)
|
||
|
|
{
|
||
|
|
if (atimer->running) {
|
||
|
|
struct hw *hw = atimer->atc->hw;
|
||
|
|
hw->set_timer_irq(hw, 0);
|
||
|
|
hw->set_timer_tick(hw, 0);
|
||
|
|
atimer->running = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline unsigned int ct_xfitimer_get_wc(struct ct_timer *atimer)
|
||
|
|
{
|
||
|
|
struct hw *hw = atimer->atc->hw;
|
||
|
|
return hw->get_wc(hw);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* reprogram the timer interval;
|
||
|
|
* checks the running instance list and determines the next timer interval.
|
||
|
|
* also updates the each stream position, returns the number of streams
|
||
|
|
* to call snd_pcm_period_elapsed() appropriately
|
||
|
|
*
|
||
|
|
* call this inside the lock and irq disabled
|
||
|
|
*/
|
||
|
|
static int ct_xfitimer_reprogram(struct ct_timer *atimer, int can_update)
|
||
|
|
{
|
||
|
|
struct ct_timer_instance *ti;
|
||
|
|
unsigned int min_intr = (unsigned int)-1;
|
||
|
|
int updates = 0;
|
||
|
|
unsigned int wc, diff;
|
||
|
|
|
||
|
|
if (list_empty(&atimer->running_head)) {
|
||
|
|
ct_xfitimer_irq_stop(atimer);
|
||
|
|
atimer->reprogram = 0; /* clear flag */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
wc = ct_xfitimer_get_wc(atimer);
|
||
|
|
diff = wc - atimer->wc;
|
||
|
|
atimer->wc = wc;
|
||
|
|
list_for_each_entry(ti, &atimer->running_head, running_list) {
|
||
|
|
if (ti->frag_count > diff)
|
||
|
|
ti->frag_count -= diff;
|
||
|
|
else {
|
||
|
|
unsigned int pos;
|
||
|
|
unsigned int period_size, rate;
|
||
|
|
|
||
|
|
period_size = ti->substream->runtime->period_size;
|
||
|
|
rate = ti->substream->runtime->rate;
|
||
|
|
pos = ti->substream->ops->pointer(ti->substream);
|
||
|
|
if (pos / period_size != ti->position / period_size) {
|
||
|
|
ti->need_update = 1;
|
||
|
|
ti->position = pos;
|
||
|
|
updates++;
|
||
|
|
}
|
||
|
|
pos %= period_size;
|
||
|
|
pos = period_size - pos;
|
||
|
|
ti->frag_count = div_u64((u64)pos * CT_TIMER_FREQ +
|
||
|
|
rate - 1, rate);
|
||
|
|
}
|
||
|
|
if (ti->need_update && !can_update)
|
||
|
|
min_intr = 0; /* pending to the next irq */
|
||
|
|
if (ti->frag_count < min_intr)
|
||
|
|
min_intr = ti->frag_count;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (min_intr < MIN_TICKS)
|
||
|
|
min_intr = MIN_TICKS;
|
||
|
|
ct_xfitimer_irq_rearm(atimer, min_intr);
|
||
|
|
atimer->reprogram = 0; /* clear flag */
|
||
|
|
return updates;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* look through the instance list and call period_elapsed if needed */
|
||
|
|
static void ct_xfitimer_check_period(struct ct_timer *atimer)
|
||
|
|
{
|
||
|
|
struct ct_timer_instance *ti;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&atimer->list_lock, flags);
|
||
|
|
list_for_each_entry(ti, &atimer->instance_head, instance_list) {
|
||
|
|
if (ti->running && ti->need_update) {
|
||
|
|
ti->need_update = 0;
|
||
|
|
ti->apcm->interrupt(ti->apcm);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
spin_unlock_irqrestore(&atimer->list_lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Handle timer-interrupt */
|
||
|
|
static void ct_xfitimer_callback(struct ct_timer *atimer)
|
||
|
|
{
|
||
|
|
int update;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&atimer->lock, flags);
|
||
|
|
atimer->irq_handling = 1;
|
||
|
|
do {
|
||
|
|
update = ct_xfitimer_reprogram(atimer, 1);
|
||
|
|
spin_unlock(&atimer->lock);
|
||
|
|
if (update)
|
||
|
|
ct_xfitimer_check_period(atimer);
|
||
|
|
spin_lock(&atimer->lock);
|
||
|
|
} while (atimer->reprogram);
|
||
|
|
atimer->irq_handling = 0;
|
||
|
|
spin_unlock_irqrestore(&atimer->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ct_xfitimer_prepare(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
ti->frag_count = ti->substream->runtime->period_size;
|
||
|
|
ti->running = 0;
|
||
|
|
ti->need_update = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* start/stop the timer */
|
||
|
|
static void ct_xfitimer_update(struct ct_timer *atimer)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&atimer->lock, flags);
|
||
|
|
if (atimer->irq_handling) {
|
||
|
|
/* reached from IRQ handler; let it handle later */
|
||
|
|
atimer->reprogram = 1;
|
||
|
|
spin_unlock_irqrestore(&atimer->lock, flags);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
ct_xfitimer_irq_stop(atimer);
|
||
|
|
ct_xfitimer_reprogram(atimer, 0);
|
||
|
|
spin_unlock_irqrestore(&atimer->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ct_xfitimer_start(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
struct ct_timer *atimer = ti->timer_base;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&atimer->lock, flags);
|
||
|
|
if (list_empty(&ti->running_list))
|
||
|
|
atimer->wc = ct_xfitimer_get_wc(atimer);
|
||
|
|
ti->running = 1;
|
||
|
|
ti->need_update = 0;
|
||
|
|
list_add(&ti->running_list, &atimer->running_head);
|
||
|
|
spin_unlock_irqrestore(&atimer->lock, flags);
|
||
|
|
ct_xfitimer_update(atimer);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ct_xfitimer_stop(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
struct ct_timer *atimer = ti->timer_base;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&atimer->lock, flags);
|
||
|
|
list_del_init(&ti->running_list);
|
||
|
|
ti->running = 0;
|
||
|
|
spin_unlock_irqrestore(&atimer->lock, flags);
|
||
|
|
ct_xfitimer_update(atimer);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ct_xfitimer_free_global(struct ct_timer *atimer)
|
||
|
|
{
|
||
|
|
ct_xfitimer_irq_stop(atimer);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct ct_timer_ops ct_xfitimer_ops = {
|
||
|
|
.prepare = ct_xfitimer_prepare,
|
||
|
|
.start = ct_xfitimer_start,
|
||
|
|
.stop = ct_xfitimer_stop,
|
||
|
|
.interrupt = ct_xfitimer_callback,
|
||
|
|
.free_global = ct_xfitimer_free_global,
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* timer instance
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct ct_timer_instance *
|
||
|
|
ct_timer_instance_new(struct ct_timer *atimer, struct ct_atc_pcm *apcm)
|
||
|
|
{
|
||
|
|
struct ct_timer_instance *ti;
|
||
|
|
|
||
|
|
ti = kzalloc(sizeof(*ti), GFP_KERNEL);
|
||
|
|
if (!ti)
|
||
|
|
return NULL;
|
||
|
|
spin_lock_init(&ti->lock);
|
||
|
|
INIT_LIST_HEAD(&ti->instance_list);
|
||
|
|
INIT_LIST_HEAD(&ti->running_list);
|
||
|
|
ti->timer_base = atimer;
|
||
|
|
ti->apcm = apcm;
|
||
|
|
ti->substream = apcm->substream;
|
||
|
|
if (atimer->ops->init)
|
||
|
|
atimer->ops->init(ti);
|
||
|
|
|
||
|
|
spin_lock_irq(&atimer->list_lock);
|
||
|
|
list_add(&ti->instance_list, &atimer->instance_head);
|
||
|
|
spin_unlock_irq(&atimer->list_lock);
|
||
|
|
|
||
|
|
return ti;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ct_timer_prepare(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
if (ti->timer_base->ops->prepare)
|
||
|
|
ti->timer_base->ops->prepare(ti);
|
||
|
|
ti->position = 0;
|
||
|
|
ti->running = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ct_timer_start(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
struct ct_timer *atimer = ti->timer_base;
|
||
|
|
atimer->ops->start(ti);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ct_timer_stop(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
struct ct_timer *atimer = ti->timer_base;
|
||
|
|
atimer->ops->stop(ti);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ct_timer_instance_free(struct ct_timer_instance *ti)
|
||
|
|
{
|
||
|
|
struct ct_timer *atimer = ti->timer_base;
|
||
|
|
|
||
|
|
atimer->ops->stop(ti); /* to be sure */
|
||
|
|
if (atimer->ops->free_instance)
|
||
|
|
atimer->ops->free_instance(ti);
|
||
|
|
|
||
|
|
spin_lock_irq(&atimer->list_lock);
|
||
|
|
list_del(&ti->instance_list);
|
||
|
|
spin_unlock_irq(&atimer->list_lock);
|
||
|
|
|
||
|
|
kfree(ti);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* timer manager
|
||
|
|
*/
|
||
|
|
|
||
|
|
static void ct_timer_interrupt(void *data, unsigned int status)
|
||
|
|
{
|
||
|
|
struct ct_timer *timer = data;
|
||
|
|
|
||
|
|
/* Interval timer interrupt */
|
||
|
|
if ((status & IT_INT) && timer->ops->interrupt)
|
||
|
|
timer->ops->interrupt(timer);
|
||
|
|
}
|
||
|
|
|
||
|
|
struct ct_timer *ct_timer_new(struct ct_atc *atc)
|
||
|
|
{
|
||
|
|
struct ct_timer *atimer;
|
||
|
|
struct hw *hw;
|
||
|
|
|
||
|
|
atimer = kzalloc(sizeof(*atimer), GFP_KERNEL);
|
||
|
|
if (!atimer)
|
||
|
|
return NULL;
|
||
|
|
spin_lock_init(&atimer->lock);
|
||
|
|
spin_lock_init(&atimer->list_lock);
|
||
|
|
INIT_LIST_HEAD(&atimer->instance_head);
|
||
|
|
INIT_LIST_HEAD(&atimer->running_head);
|
||
|
|
atimer->atc = atc;
|
||
|
|
hw = atc->hw;
|
||
|
|
if (!use_system_timer && hw->set_timer_irq) {
|
||
|
|
dev_info(atc->card->dev, "Use xfi-native timer\n");
|
||
|
|
atimer->ops = &ct_xfitimer_ops;
|
||
|
|
hw->irq_callback_data = atimer;
|
||
|
|
hw->irq_callback = ct_timer_interrupt;
|
||
|
|
} else {
|
||
|
|
dev_info(atc->card->dev, "Use system timer\n");
|
||
|
|
atimer->ops = &ct_systimer_ops;
|
||
|
|
}
|
||
|
|
return atimer;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ct_timer_free(struct ct_timer *atimer)
|
||
|
|
{
|
||
|
|
struct hw *hw = atimer->atc->hw;
|
||
|
|
hw->irq_callback = NULL;
|
||
|
|
if (atimer->ops->free_global)
|
||
|
|
atimer->ops->free_global(atimer);
|
||
|
|
kfree(atimer);
|
||
|
|
}
|
||
|
|
|