int mite_sync_input_dma(struct mite_channel *mite_chan, comedi_async * async)
{
int count;
unsigned int nbytes, old_alloc_count;
const unsigned bytes_per_scan = cfc_bytes_per_scan(async->subdevice);
old_alloc_count = async->buf_write_alloc_count;
// write alloc as much as we can
comedi_buf_write_alloc(async, async->prealloc_bufsz);
nbytes = mite_bytes_written_to_memory_lb(mite_chan);
if ((int)(mite_bytes_written_to_memory_ub(mite_chan) -
old_alloc_count) > 0) {
rt_printk("mite: DMA overwrite of free area\n");
async->events |= COMEDI_CB_OVERFLOW;
return -1;
}
count = nbytes - async->buf_write_count;
/* it's possible count will be negative due to
* conservative value returned by mite_bytes_written_to_memory_lb */
if (count <= 0) {
return 0;
}
comedi_buf_write_free(async, count);
async->scan_progress += count;
if (async->scan_progress >= bytes_per_scan) {
async->scan_progress %= bytes_per_scan;
async->events |= COMEDI_CB_EOS;
}
async->events |= COMEDI_CB_BLOCK;
return 0;
}
int mite_sync_input_dma(struct mite_channel *mite_chan,
struct comedi_subdevice *s)
{
struct comedi_async *async = s->async;
int count;
unsigned int nbytes, old_alloc_count;
old_alloc_count = async->buf_write_alloc_count;
/* write alloc as much as we can */
comedi_buf_write_alloc(s, async->prealloc_bufsz);
nbytes = mite_bytes_written_to_memory_lb(mite_chan);
if ((int)(mite_bytes_written_to_memory_ub(mite_chan) -
old_alloc_count) > 0) {
dev_warn(s->device->class_dev,
"mite: DMA overwrite of free area\n");
async->events |= COMEDI_CB_OVERFLOW;
return -1;
}
count = nbytes - async->buf_write_count;
/*
* it's possible count will be negative due to conservative value
* returned by mite_bytes_written_to_memory_lb
*/
if (count <= 0)
return 0;
comedi_buf_write_free(s, count);
comedi_inc_scan_progress(s, count);
async->events |= COMEDI_CB_BLOCK;
return 0;
}
static int ni_tio_input_cmd(struct ni_gpct *counter, struct comedi_async *async)
{
struct ni_gpct_device *counter_dev = counter->counter_dev;
unsigned cidx = counter->counter_index;
struct comedi_cmd *cmd = &async->cmd;
int retval = 0;
/* write alloc the entire buffer */
comedi_buf_write_alloc(async, async->prealloc_bufsz);
counter->mite_chan->dir = COMEDI_INPUT;
switch (counter_dev->variant) {
case ni_gpct_variant_m_series:
case ni_gpct_variant_660x:
mite_prep_dma(counter->mite_chan, 32, 32);
break;
case ni_gpct_variant_e_series:
mite_prep_dma(counter->mite_chan, 16, 32);
break;
default:
BUG();
break;
}
ni_tio_set_bits(counter, NITIO_CMD_REG(cidx), Gi_Save_Trace_Bit, 0);
ni_tio_configure_dma(counter, 1, 1);
switch (cmd->start_src) {
case TRIG_NOW:
async->inttrig = NULL;
mite_dma_arm(counter->mite_chan);
retval = ni_tio_arm(counter, 1, NI_GPCT_ARM_IMMEDIATE);
break;
case TRIG_INT:
async->inttrig = &ni_tio_input_inttrig;
break;
case TRIG_EXT:
async->inttrig = NULL;
mite_dma_arm(counter->mite_chan);
retval = ni_tio_arm(counter, 1, cmd->start_arg);
break;
case TRIG_OTHER:
async->inttrig = NULL;
mite_dma_arm(counter->mite_chan);
break;
default:
BUG();
break;
}
return retval;
}
int comedi_mark_buffer_written(void *d, unsigned int subdevice,
unsigned int num_bytes)
{
struct comedi_device *dev = (struct comedi_device *) d;
struct comedi_subdevice *s = dev->subdevices + subdevice;
struct comedi_async *async;
int bytes_written;
if (subdevice >= dev->n_subdevices)
return -1;
async = s->async;
if (async == NULL)
return -1;
bytes_written = comedi_buf_write_alloc(async, num_bytes);
comedi_buf_write_free(async, bytes_written);
if (bytes_written != num_bytes)
return -1;
return 0;
}
static int ni_tio_input_cmd(struct comedi_subdevice *s)
{
struct ni_gpct *counter = s->private;
struct ni_gpct_device *counter_dev = counter->counter_dev;
unsigned cidx = counter->counter_index;
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
int ret = 0;
/* write alloc the entire buffer */
comedi_buf_write_alloc(s, async->prealloc_bufsz);
counter->mite_chan->dir = COMEDI_INPUT;
switch (counter_dev->variant) {
case ni_gpct_variant_m_series:
case ni_gpct_variant_660x:
mite_prep_dma(counter->mite_chan, 32, 32);
break;
case ni_gpct_variant_e_series:
mite_prep_dma(counter->mite_chan, 16, 32);
break;
default:
BUG();
break;
}
ni_tio_set_bits(counter, NITIO_CMD_REG(cidx), GI_SAVE_TRACE, 0);
ni_tio_configure_dma(counter, true, true);
if (cmd->start_src == TRIG_INT) {
async->inttrig = &ni_tio_input_inttrig;
} else { /* TRIG_NOW || TRIG_EXT || TRIG_OTHER */
async->inttrig = NULL;
mite_dma_arm(counter->mite_chan);
if (cmd->start_src == TRIG_NOW)
ret = ni_tio_arm(counter, 1, NI_GPCT_ARM_IMMEDIATE);
else if (cmd->start_src == TRIG_EXT)
ret = ni_tio_arm(counter, 1, cmd->start_arg);
}
return ret;
}
static int setup_mite_dma(struct comedi_device *dev, struct comedi_subdevice *s)
{
int retval;
unsigned long flags;
retval = ni_pcidio_request_di_mite_channel(dev);
if (retval)
return retval;
/* write alloc the entire buffer */
comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
if (devpriv->di_mite_chan) {
mite_prep_dma(devpriv->di_mite_chan, 32, 32);
mite_dma_arm(devpriv->di_mite_chan);
} else
retval = -EIO;
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
return retval;
}
/* Writes an array of data points to comedi's buffer */
unsigned int cfc_write_array_to_buffer(struct comedi_subdevice *subd,
void *data, unsigned int num_bytes)
{
struct comedi_async *async = subd->async;
unsigned int retval;
if (num_bytes == 0)
return 0;
retval = comedi_buf_write_alloc(async, num_bytes);
if (retval != num_bytes) {
dev_warn(subd->device->class_dev, "comedi: buffer overrun\n");
async->events |= COMEDI_CB_OVERFLOW;
return 0;
}
comedi_buf_memcpy_to(async, 0, data, num_bytes);
comedi_buf_write_free(async, num_bytes);
increment_scan_progress(subd, num_bytes);
async->events |= COMEDI_CB_BLOCK;
return num_bytes;
}