[PATCH 02/19] staging: comedi: ni_mio_common: tidy up mite dma channel requests
H Hartley Sweeten
hsweeten at visionengravers.com
Tue Apr 12 21:12:45 UTC 2016
Tidy up the functions that request the mite dma channels by absorbing the
inline helper functions that call ni_set_bitfield() to set the channel
selection bits.
Add support for the NI_M_CDIO_DMA_SEL_REG register to ni_set_bitfield()
so that all the soft_reg_copy_lock spinlocking is done in one place.
Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
drivers/staging/comedi/drivers/ni_mio_common.c | 140 +++++++++++--------------
1 file changed, 59 insertions(+), 81 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
index 7a32605..231cd2c 100644
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -556,6 +556,11 @@ static inline void ni_set_bitfield(struct comedi_device *dev, int reg,
devpriv->g0_g1_select_reg |= bit_values & bit_mask;
ni_writeb(dev, devpriv->g0_g1_select_reg, reg);
break;
+ case NI_M_CDIO_DMA_SEL_REG:
+ devpriv->cdio_dma_select_reg &= ~bit_mask;
+ devpriv->cdio_dma_select_reg |= bit_values & bit_mask;
+ ni_writeb(dev, devpriv->cdio_dma_select_reg, reg);
+ break;
default:
dev_err(dev->class_dev, "called with invalid register %d\n",
reg);
@@ -579,45 +584,16 @@ static inline unsigned ni_stc_dma_channel_select_bitfield(unsigned channel)
return 0;
}
-static inline void ni_set_ai_dma_channel(struct comedi_device *dev,
- unsigned channel)
-{
- unsigned bits = ni_stc_dma_channel_select_bitfield(channel);
-
- ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG,
- NI_E_DMA_AI_SEL_MASK, NI_E_DMA_AI_SEL(bits));
-}
-
static inline void ni_set_ai_dma_no_channel(struct comedi_device *dev)
{
ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG, NI_E_DMA_AI_SEL_MASK, 0);
}
-static inline void ni_set_ao_dma_channel(struct comedi_device *dev,
- unsigned channel)
-{
- unsigned bits = ni_stc_dma_channel_select_bitfield(channel);
-
- ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG,
- NI_E_DMA_AO_SEL_MASK, NI_E_DMA_AO_SEL(bits));
-}
-
static inline void ni_set_ao_dma_no_channel(struct comedi_device *dev)
{
ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG, NI_E_DMA_AO_SEL_MASK, 0);
}
-static inline void ni_set_gpct_dma_channel(struct comedi_device *dev,
- unsigned gpct_index,
- unsigned channel)
-{
- unsigned bits = ni_stc_dma_channel_select_bitfield(channel);
-
- ni_set_bitfield(dev, NI_E_DMA_G0_G1_SEL_REG,
- NI_E_DMA_G0_G1_SEL_MASK(gpct_index),
- NI_E_DMA_G0_G1_SEL(gpct_index, bits));
-}
-
static inline void ni_set_gpct_dma_no_channel(struct comedi_device *dev,
unsigned gpct_index)
{
@@ -625,56 +601,34 @@ static inline void ni_set_gpct_dma_no_channel(struct comedi_device *dev,
NI_E_DMA_G0_G1_SEL_MASK(gpct_index), 0);
}
-static inline void ni_set_cdo_dma_channel(struct comedi_device *dev,
- unsigned mite_channel)
-{
- struct ni_private *devpriv = dev->private;
- unsigned long flags;
- unsigned bits;
-
- spin_lock_irqsave(&devpriv->soft_reg_copy_lock, flags);
- devpriv->cdio_dma_select_reg &= ~NI_M_CDIO_DMA_SEL_CDO_MASK;
- /*
- * XXX just guessing ni_stc_dma_channel_select_bitfield()
- * returns the right bits, under the assumption the cdio dma
- * selection works just like ai/ao/gpct.
- * Definitely works for dma channels 0 and 1.
- */
- bits = ni_stc_dma_channel_select_bitfield(mite_channel);
- devpriv->cdio_dma_select_reg |= NI_M_CDIO_DMA_SEL_CDO(bits);
- ni_writeb(dev, devpriv->cdio_dma_select_reg, NI_M_CDIO_DMA_SEL_REG);
- mmiowb();
- spin_unlock_irqrestore(&devpriv->soft_reg_copy_lock, flags);
-}
-
static inline void ni_set_cdo_dma_no_channel(struct comedi_device *dev)
{
- struct ni_private *devpriv = dev->private;
- unsigned long flags;
-
- spin_lock_irqsave(&devpriv->soft_reg_copy_lock, flags);
- devpriv->cdio_dma_select_reg &= ~NI_M_CDIO_DMA_SEL_CDO_MASK;
- ni_writeb(dev, devpriv->cdio_dma_select_reg, NI_M_CDIO_DMA_SEL_REG);
- mmiowb();
- spin_unlock_irqrestore(&devpriv->soft_reg_copy_lock, flags);
+ ni_set_bitfield(dev, NI_M_CDIO_DMA_SEL_REG,
+ NI_M_CDIO_DMA_SEL_CDO_MASK, 0);
}
static int ni_request_ai_mite_channel(struct comedi_device *dev)
{
struct ni_private *devpriv = dev->private;
+ struct mite_channel *mite_chan;
unsigned long flags;
+ unsigned int bits;
spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
- devpriv->ai_mite_chan =
- mite_request_channel(devpriv->mite, devpriv->ai_mite_ring);
- if (!devpriv->ai_mite_chan) {
+ mite_chan = mite_request_channel(devpriv->mite, devpriv->ai_mite_ring);
+ if (!mite_chan) {
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
dev_err(dev->class_dev,
"failed to reserve mite dma channel for analog input\n");
return -EBUSY;
}
- devpriv->ai_mite_chan->dir = COMEDI_INPUT;
- ni_set_ai_dma_channel(dev, devpriv->ai_mite_chan->channel);
+ mite_chan->dir = COMEDI_INPUT;
+ devpriv->ai_mite_chan = mite_chan;
+
+ bits = ni_stc_dma_channel_select_bitfield(mite_chan->channel);
+ ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG,
+ NI_E_DMA_AI_SEL_MASK, NI_E_DMA_AI_SEL(bits));
+
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
return 0;
}
@@ -682,19 +636,25 @@ static int ni_request_ai_mite_channel(struct comedi_device *dev)
static int ni_request_ao_mite_channel(struct comedi_device *dev)
{
struct ni_private *devpriv = dev->private;
+ struct mite_channel *mite_chan;
unsigned long flags;
+ unsigned int bits;
spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
- devpriv->ao_mite_chan =
- mite_request_channel(devpriv->mite, devpriv->ao_mite_ring);
- if (!devpriv->ao_mite_chan) {
+ mite_chan = mite_request_channel(devpriv->mite, devpriv->ao_mite_ring);
+ if (!mite_chan) {
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
dev_err(dev->class_dev,
"failed to reserve mite dma channel for analog outut\n");
return -EBUSY;
}
- devpriv->ao_mite_chan->dir = COMEDI_OUTPUT;
- ni_set_ao_dma_channel(dev, devpriv->ao_mite_chan->channel);
+ mite_chan->dir = COMEDI_OUTPUT;
+ devpriv->ao_mite_chan = mite_chan;
+
+ bits = ni_stc_dma_channel_select_bitfield(mite_chan->channel);
+ ni_set_bitfield(dev, NI_E_DMA_AI_AO_SEL_REG,
+ NI_E_DMA_AO_SEL_MASK, NI_E_DMA_AO_SEL(bits));
+
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
return 0;
}
@@ -704,13 +664,14 @@ static int ni_request_gpct_mite_channel(struct comedi_device *dev,
enum comedi_io_direction direction)
{
struct ni_private *devpriv = dev->private;
- unsigned long flags;
+ struct ni_gpct *counter = &devpriv->counter_dev->counters[gpct_index];
struct mite_channel *mite_chan;
+ unsigned long flags;
+ unsigned int bits;
spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
- mite_chan =
- mite_request_channel(devpriv->mite,
- devpriv->gpct_mite_ring[gpct_index]);
+ mite_chan = mite_request_channel(devpriv->mite,
+ devpriv->gpct_mite_ring[gpct_index]);
if (!mite_chan) {
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
dev_err(dev->class_dev,
@@ -718,9 +679,13 @@ static int ni_request_gpct_mite_channel(struct comedi_device *dev,
return -EBUSY;
}
mite_chan->dir = direction;
- ni_tio_set_mite_channel(&devpriv->counter_dev->counters[gpct_index],
- mite_chan);
- ni_set_gpct_dma_channel(dev, gpct_index, mite_chan->channel);
+ ni_tio_set_mite_channel(counter, mite_chan);
+
+ bits = ni_stc_dma_channel_select_bitfield(mite_chan->channel);
+ ni_set_bitfield(dev, NI_E_DMA_G0_G1_SEL_REG,
+ NI_E_DMA_G0_G1_SEL_MASK(gpct_index),
+ NI_E_DMA_G0_G1_SEL(gpct_index, bits));
+
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
return 0;
}
@@ -731,19 +696,32 @@ static int ni_request_cdo_mite_channel(struct comedi_device *dev)
{
#ifdef PCIDMA
struct ni_private *devpriv = dev->private;
+ struct mite_channel *mite_chan;
unsigned long flags;
+ unsigned int bits;
spin_lock_irqsave(&devpriv->mite_channel_lock, flags);
- devpriv->cdo_mite_chan =
- mite_request_channel(devpriv->mite, devpriv->cdo_mite_ring);
- if (!devpriv->cdo_mite_chan) {
+ mite_chan = mite_request_channel(devpriv->mite, devpriv->cdo_mite_ring);
+ if (!mite_chan) {
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
dev_err(dev->class_dev,
"failed to reserve mite dma channel for correlated digital output\n");
return -EBUSY;
}
- devpriv->cdo_mite_chan->dir = COMEDI_OUTPUT;
- ni_set_cdo_dma_channel(dev, devpriv->cdo_mite_chan->channel);
+ mite_chan->dir = COMEDI_OUTPUT;
+ devpriv->cdo_mite_chan = mite_chan;
+
+ /*
+ * XXX just guessing ni_stc_dma_channel_select_bitfield()
+ * returns the right bits, under the assumption the cdio dma
+ * selection works just like ai/ao/gpct.
+ * Definitely works for dma channels 0 and 1.
+ */
+ bits = ni_stc_dma_channel_select_bitfield(mite_chan->channel);
+ ni_set_bitfield(dev, NI_M_CDIO_DMA_SEL_REG,
+ NI_M_CDIO_DMA_SEL_CDO_MASK,
+ NI_M_CDIO_DMA_SEL_CDO(bits));
+
spin_unlock_irqrestore(&devpriv->mite_channel_lock, flags);
#endif /* PCIDMA */
return 0;
--
2.6.3
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