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staging: comedi: dt282x: remove VIRT_TO_BUS dependancy 

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 10:56:11 -07:00 committed by Greg Kroah-Hartman
parent eca331c20f
commit ef98a104c2
2 changed files with 9 additions and 6 deletions
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2
drivers/staging/comedi/Kconfig
View File

@ -372,7 +372,7 @@ config COMEDI_DT2817
config COMEDI_DT282X
tristate "Data Translation DT2821 series and DT-EZ ISA card support"
depends on VIRT_TO_BUS && ISA_DMA_API
depends on ISA_DMA_API
---help---
Enable support for Data Translation DT2821 series including DT-EZ
DT2821, DT2821-F-16SE, DT2821-F-8DI, DT2821-G-16SE, DT2821-G-8DI,

13
drivers/staging/comedi/drivers/dt282x.c
View File

@ -302,7 +302,8 @@ static const struct dt282x_board boardtypes[] = {
struct dt282x_dma_desc {
unsigned int chan; /* DMA channel */
unsigned short *virt_addr; /* virtual address of DMA buffer */
void *virt_addr; /* virtual address of DMA buffer */
dma_addr_t hw_addr; /* hardware (bus) address of DMA buffer */
unsigned int size; /* transfer size (in bytes) */
};
@ -344,7 +345,7 @@ static int dt282x_prep_ai_dma(struct comedi_device *dev, int dma_index, int n)
set_dma_mode(dma->chan, DMA_MODE_READ);
flags = claim_dma_lock();
clear_dma_ff(dma->chan);
set_dma_addr(dma->chan, virt_to_bus(dma->virt_addr));
set_dma_addr(dma->chan, dma->hw_addr);
set_dma_count(dma->chan, dma->size);
release_dma_lock(flags);
@ -364,7 +365,7 @@ static int dt282x_prep_ao_dma(struct comedi_device *dev, int dma_index, int n)
set_dma_mode(dma->chan, DMA_MODE_WRITE);
flags = claim_dma_lock();
clear_dma_ff(dma->chan);
set_dma_addr(dma->chan, virt_to_bus(dma->virt_addr));
set_dma_addr(dma->chan, dma->hw_addr);
set_dma_count(dma->chan, dma->size);
release_dma_lock(flags);
@ -1087,7 +1088,8 @@ static int dt282x_alloc_dma(struct comedi_device *dev,
struct dt282x_dma_desc *dma = &devpriv->dma_desc[i];
dma->chan = dma_chan[i];
dma->virt_addr = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
dma->virt_addr = dma_alloc_coherent(NULL, devpriv->dma_maxsize,
&dma->hw_addr, GFP_KERNEL);
if (!dma->virt_addr)
return -ENOMEM;
}
@ -1109,7 +1111,8 @@ static void dt282x_free_dma(struct comedi_device *dev)
if (dma->chan)
free_dma(dma->chan);
if (dma->virt_addr)
free_page((unsigned long)dma->virt_addr);
dma_free_coherent(NULL, devpriv->dma_maxsize,
dma->virt_addr, dma->hw_addr);
}
}