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staging: comedi: pcl818: remove VIRT_TO_BUS dependancy

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Use dma_{alloc,free}_coherent() to allocate and free the DMA buffers.
This removes the dependancy on VIRT_TO_BUS.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2015-01-12 10:55:58 -07:00 committed by Greg Kroah-Hartman
parent b8e7048bab
commit 7a37b7a755
2 changed files with 13 additions and 14 deletions
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2
drivers/staging/comedi/Kconfig
View File

@ -188,7 +188,7 @@ config COMEDI_PCL816
config COMEDI_PCL818
tristate "Advantech PCL-718 and PCL-818 ISA card support"
depends on VIRT_TO_BUS && ISA_DMA_API
depends on ISA_DMA_API
---help---
Enable support for Advantech PCL-818 ISA cards
PCL-818L, PCL-818H, PCL-818HD, PCL-818HG, PCL-818 and PCL-718

25
drivers/staging/comedi/drivers/pcl818.c
View File

@ -303,13 +303,12 @@ static const struct pcl818_board boardtypes[] = {
};
struct pcl818_dma_desc {
unsigned long dmabuf; /* pointers to begin of DMA buffers */
unsigned int hwdmaptr; /* hardware address of DMA buffers */
void *virt_addr; /* virtual address of DMA buffer */
dma_addr_t hw_addr; /* hardware (bus) address of DMA buffer */
};
struct pcl818_private {
unsigned int dma; /* used DMA, 0=don't use DMA */
unsigned int dmapages;
unsigned int hwdmasize;
struct pcl818_dma_desc dma_desc[2];
int cur_dma;
@ -367,7 +366,7 @@ static void pcl818_ai_setup_dma(struct comedi_device *dev,
set_dma_mode(devpriv->dma, DMA_MODE_READ);
flags = claim_dma_lock();
clear_dma_ff(devpriv->dma);
set_dma_addr(devpriv->dma, dma->hwdmaptr);
set_dma_addr(devpriv->dma, dma->hw_addr);
set_dma_count(devpriv->dma, bytes);
release_dma_lock(flags);
enable_dma(devpriv->dma);
@ -388,7 +387,7 @@ static void pcl818_ai_setup_next_dma(struct comedi_device *dev,
dma = &devpriv->dma_desc[devpriv->cur_dma];
set_dma_mode(devpriv->dma, DMA_MODE_READ);
flags = claim_dma_lock();
set_dma_addr(devpriv->dma, dma->hwdmaptr);
set_dma_addr(devpriv->dma, dma->hw_addr);
if (devpriv->dma_runs_to_end || cmd->stop_src == TRIG_NONE)
set_dma_count(devpriv->dma, devpriv->hwdmasize);
else
@ -565,7 +564,7 @@ static void pcl818_handle_dma(struct comedi_device *dev,
{
struct pcl818_private *devpriv = dev->private;
struct pcl818_dma_desc *dma = &devpriv->dma_desc[devpriv->cur_dma];
unsigned short *ptr = (unsigned short *)dma->dmabuf;
unsigned short *ptr = dma->virt_addr;
unsigned int chan;
unsigned int val;
int i, len, bufptr;
@ -1072,16 +1071,15 @@ static int pcl818_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
return 0;
devpriv->dma = dma_chan;
devpriv->dmapages = 2; /* we need 16KB */
devpriv->hwdmasize = (1 << devpriv->dmapages) * PAGE_SIZE;
devpriv->hwdmasize = PAGE_SIZE * 4; /* we need 16KB */
for (i = 0; i < 2; i++) {
dma = &devpriv->dma_desc[i];
dma->dmabuf = __get_dma_pages(GFP_KERNEL, devpriv->dmapages);
if (!dma->dmabuf)
dma->virt_addr = dma_alloc_coherent(NULL, devpriv->hwdmasize,
&dma->hw_addr, GFP_KERNEL);
if (!dma->virt_addr)
return -ENOMEM;
dma->hwdmaptr = virt_to_bus((void *)dma->dmabuf);
}
return 0;
}
@ -1099,8 +1097,9 @@ static void pcl818_free_dma(struct comedi_device *dev)
free_dma(devpriv->dma);
for (i = 0; i < 2; i++) {
dma = &devpriv->dma_desc[i];
if (dma->dmabuf)
free_pages(dma->dmabuf, devpriv->dmapages);
if (dma->virt_addr)
dma_free_coherent(NULL, devpriv->hwdmasize,
dma->virt_addr, dma->hw_addr);
}
}