From 38b81a7a41d48e84d71f0b65fa15a684c9ae81da Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Thu, 14 Apr 2016 09:57:50 -0700 Subject: [PATCH] staging: comedi: ni_mio_common: tidy up mite dma channel requests 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 Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- 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; -- 2.7.4