From: Ian Abbott Date: Fri, 28 Jun 2013 16:09:25 +0000 (+0100) Subject: staging: comedi: ni_labpc: migrate labpc_drain_dma() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f88e8e09880d4abe3cad98ec8889e0f46eb89e4d;p=linux-beck.git staging: comedi: ni_labpc: migrate labpc_drain_dma() Move `labpc_drain_dma()` into the "ni_labpc_isadma" module. Provide a dummy inline function in "ni_labpc_isadma.h" if the module is not being built. Signed-off-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c index e1b073f746fe..818a8abe208c 100644 --- a/drivers/staging/comedi/drivers/ni_labpc.c +++ b/drivers/staging/comedi/drivers/ni_labpc.c @@ -906,60 +906,6 @@ static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) } #ifdef CONFIG_ISA_DMA_API -static void labpc_drain_dma(struct comedi_device *dev) -{ - struct labpc_private *devpriv = dev->private; - struct comedi_subdevice *s = dev->read_subdev; - struct comedi_async *async = s->async; - int status; - unsigned long flags; - unsigned int max_points, num_points, residue, leftover; - int i; - - status = devpriv->stat1; - - flags = claim_dma_lock(); - disable_dma(devpriv->dma_chan); - /* clear flip-flop to make sure 2-byte registers for - * count and address get set correctly */ - clear_dma_ff(devpriv->dma_chan); - - /* figure out how many points to read */ - max_points = devpriv->dma_transfer_size / sample_size; - /* residue is the number of points left to be done on the dma - * transfer. It should always be zero at this point unless - * the stop_src is set to external triggering. - */ - residue = get_dma_residue(devpriv->dma_chan) / sample_size; - num_points = max_points - residue; - if (devpriv->count < num_points && async->cmd.stop_src == TRIG_COUNT) - num_points = devpriv->count; - - /* figure out how many points will be stored next time */ - leftover = 0; - if (async->cmd.stop_src != TRIG_COUNT) { - leftover = devpriv->dma_transfer_size / sample_size; - } else if (devpriv->count > num_points) { - leftover = devpriv->count - num_points; - if (leftover > max_points) - leftover = max_points; - } - - /* write data to comedi buffer */ - for (i = 0; i < num_points; i++) - cfc_write_to_buffer(s, devpriv->dma_buffer[i]); - - if (async->cmd.stop_src == TRIG_COUNT) - devpriv->count -= num_points; - - /* set address and count for next transfer */ - set_dma_addr(devpriv->dma_chan, devpriv->dma_addr); - set_dma_count(devpriv->dma_chan, leftover * sample_size); - release_dma_lock(flags); - - async->events |= COMEDI_CB_BLOCK; -} - static void handle_isa_dma(struct comedi_device *dev) { struct labpc_private *devpriv = dev->private; @@ -1009,12 +955,10 @@ static int labpc_drain_fifo(struct comedi_device *dev) * when acquisition is terminated by stop_src == TRIG_EXT). */ static void labpc_drain_dregs(struct comedi_device *dev) { -#ifdef CONFIG_ISA_DMA_API struct labpc_private *devpriv = dev->private; if (devpriv->current_transfer == isa_dma_transfer) labpc_drain_dma(dev); -#endif labpc_drain_fifo(dev); } diff --git a/drivers/staging/comedi/drivers/ni_labpc_isadma.c b/drivers/staging/comedi/drivers/ni_labpc_isadma.c index dba2be36c48d..c4bfecc07b63 100644 --- a/drivers/staging/comedi/drivers/ni_labpc_isadma.c +++ b/drivers/staging/comedi/drivers/ni_labpc_isadma.c @@ -23,6 +23,7 @@ #include +#include "comedi_fc.h" #include "ni_labpc.h" #include "ni_labpc_regs.h" #include "ni_labpc_isadma.h" @@ -81,6 +82,61 @@ void labpc_setup_dma(struct comedi_device *dev, struct comedi_subdevice *s) } EXPORT_SYMBOL_GPL(labpc_setup_dma); +void labpc_drain_dma(struct comedi_device *dev) +{ + struct labpc_private *devpriv = dev->private; + struct comedi_subdevice *s = dev->read_subdev; + struct comedi_async *async = s->async; + int status; + unsigned long flags; + unsigned int max_points, num_points, residue, leftover; + int i; + + status = devpriv->stat1; + + flags = claim_dma_lock(); + disable_dma(devpriv->dma_chan); + /* clear flip-flop to make sure 2-byte registers for + * count and address get set correctly */ + clear_dma_ff(devpriv->dma_chan); + + /* figure out how many points to read */ + max_points = devpriv->dma_transfer_size / sample_size; + /* residue is the number of points left to be done on the dma + * transfer. It should always be zero at this point unless + * the stop_src is set to external triggering. + */ + residue = get_dma_residue(devpriv->dma_chan) / sample_size; + num_points = max_points - residue; + if (devpriv->count < num_points && async->cmd.stop_src == TRIG_COUNT) + num_points = devpriv->count; + + /* figure out how many points will be stored next time */ + leftover = 0; + if (async->cmd.stop_src != TRIG_COUNT) { + leftover = devpriv->dma_transfer_size / sample_size; + } else if (devpriv->count > num_points) { + leftover = devpriv->count - num_points; + if (leftover > max_points) + leftover = max_points; + } + + /* write data to comedi buffer */ + for (i = 0; i < num_points; i++) + cfc_write_to_buffer(s, devpriv->dma_buffer[i]); + + if (async->cmd.stop_src == TRIG_COUNT) + devpriv->count -= num_points; + + /* set address and count for next transfer */ + set_dma_addr(devpriv->dma_chan, devpriv->dma_addr); + set_dma_count(devpriv->dma_chan, leftover * sample_size); + release_dma_lock(flags); + + async->events |= COMEDI_CB_BLOCK; +} +EXPORT_SYMBOL_GPL(labpc_drain_dma); + int labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan) { struct labpc_private *devpriv = dev->private; diff --git a/drivers/staging/comedi/drivers/ni_labpc_isadma.h b/drivers/staging/comedi/drivers/ni_labpc_isadma.h index c721f57daf0c..1f322f2bc2d9 100644 --- a/drivers/staging/comedi/drivers/ni_labpc_isadma.h +++ b/drivers/staging/comedi/drivers/ni_labpc_isadma.h @@ -19,6 +19,7 @@ static inline bool labpc_have_dma_chan(struct comedi_device *dev) int labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan); void labpc_free_dma_chan(struct comedi_device *dev); void labpc_setup_dma(struct comedi_device *dev, struct comedi_subdevice *s); +void labpc_drain_dma(struct comedi_device *dev); #else @@ -42,6 +43,10 @@ static inline void labpc_setup_dma(struct comedi_device *dev, { } +static inline void labpc_drain_dma(struct comedi_device *dev) +{ +} + #endif #endif /* _NI_LABPC_ISADMA_H */