static snd_pcm_uframes_t cygnus_pcm_pointer(struct snd_pcm_substream *substream)
{
struct cygnus_aio_port *aio;
unsigned int res = 0, cur = 0, base = 0;
struct ringbuf_regs *p_rbuf = NULL;
aio = cygnus_dai_get_dma_data(substream);
/*
* Get the offset of the current read (for playack) or write
* index (for capture). Report this value back to the asoc framework.
*/
p_rbuf = get_ringbuf(substream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
cur = readl(aio->cygaud->audio + p_rbuf->rdaddr);
else
cur = readl(aio->cygaud->audio + p_rbuf->wraddr);
base = readl(aio->cygaud->audio + p_rbuf->baseaddr);
/*
* Mask off the MSB of the rdaddr,wraddr and baseaddr
* since MSB is not part of the address
*/
res = (cur & 0x7fffffff) - (base & 0x7fffffff);
return bytes_to_frames(substream->runtime, res);
}
static void cygnus_pcm_period_elapsed(struct snd_pcm_substream *substream)
{
struct cygnus_aio_port *aio;
struct ringbuf_regs *p_rbuf = NULL;
u32 regval;
aio = cygnus_dai_get_dma_data(substream);
p_rbuf = get_ringbuf(substream);
/*
* If free/full mark interrupt occurs, provide timestamp
* to ALSA and update appropriate idx by period_bytes
*/
snd_pcm_period_elapsed(substream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
/* Set the ring buffer to full */
regval = readl(aio->cygaud->audio + p_rbuf->rdaddr);
regval = regval ^ BIT(31);
writel(regval, aio->cygaud->audio + p_rbuf->wraddr);
} else {
/* Set the ring buffer to empty */
regval = readl(aio->cygaud->audio + p_rbuf->wraddr);
writel(regval, aio->cygaud->audio + p_rbuf->rdaddr);
}
}
static int cygnus_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct cygnus_aio_port *aio;
unsigned long bufsize, periodsize;
int ret = 0;
bool is_play;
u32 start;
struct ringbuf_regs *p_rbuf = NULL;
aio = cygnus_dai_get_dma_data(substream);
dev_dbg(rtd->cpu_dai->dev, "%s port %d\n", __func__, aio->portnum);
bufsize = snd_pcm_lib_buffer_bytes(substream);
periodsize = snd_pcm_lib_period_bytes(substream);
dev_dbg(rtd->cpu_dai->dev, "%s (buf_size %lu) (period_size %lu)\n",
__func__, bufsize, periodsize);
configure_ringbuf_regs(substream);
p_rbuf = get_ringbuf(substream);
start = runtime->dma_addr;
is_play = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 1 : 0;
ringbuf_set_initial(aio->cygaud->audio, p_rbuf, is_play, start,
periodsize, bufsize);
return ret;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(rx_data_process, ev, data)
{
PROCESS_BEGIN();
/* Process is polled whenever data is available from uart isr */
uint8_t c;
while(1) {
PROCESS_YIELD_UNTIL(ev == PROCESS_EVENT_POLL);
/* Read RX ringbuffer. ASCII chars Output when LF is seen.
If overflowed, strings are skipped */
do {
if (get_ringbuf(&c) == -1) {
break; /* No more rx char's in ringbuffer */
} else {
if (rx_buf_index == RX_BUFFER_SIZE) { /* Skip current content if buffer full */
rx_buf_index = 0;
}
rx_buf[rx_buf_index++] = c;
if ((c == '\n')||(c == '\r')) {
rx_buf[rx_buf_index] = '\0';
printf("RX on UART1: %s", rx_buf);
/* Signal event to coap clients.
Demo assumes data is consumed before new data comes in */
event_coap_rx_uart1_handler();
rx_buf_index = 0;
}
}
} while (1);
}
PROCESS_END();
}
/* get data from ring buffer and then write to usb bus */
static void spcp8x5_send(struct usb_serial_port *port)
{
int count, result;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
if (priv->write_urb_in_use) {
dev_dbg(&port->dev, "write urb still used\n");
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
/* send the 1st urb for writting */
memset(port->write_urb->transfer_buffer , 0x00 , port->bulk_out_size);
count = get_ringbuf(priv->buf, port->write_urb->transfer_buffer,
port->bulk_out_size);
if (count == 0) {
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
/* update the urb status */
priv->write_urb_in_use = 1;
spin_unlock_irqrestore(&priv->lock, flags);
port->write_urb->transfer_buffer_length = count;
port->write_urb->dev = port->serial->dev;
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result) {
dev_dbg(&port->dev, "failed submitting write urb, error %d\n",
result);
priv->write_urb_in_use = 0;
/* TODO: reschedule spcp8x5_send */
}
schedule_work(&port->work);
}
