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 <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/Kconfig | 2 +-
drivers/staging/comedi/drivers/das1800.c | 16 ++++++++++------
2 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index 1cdbf1f..fe030a3 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -309,7 +309,7 @@ config COMEDI_DAS800
config COMEDI_DAS1800
tristate "DAS1800 and compatible ISA card support"
- depends on VIRT_TO_BUS && ISA_DMA_API
+ depends on ISA_DMA_API
---help---
Enable support for DAS1800 and compatible ISA cards
Keithley Metrabyte DAS-1701ST, DAS-1701ST-DA, DAS-1701/AO,
diff --git a/drivers/staging/comedi/drivers/das1800.c
b/drivers/staging/comedi/drivers/das1800.c
index df28d36a..dd46a91 100644
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -422,7 +422,8 @@ static const struct das1800_board das1800_boards[] = {
struct das1800_dma_desc {
unsigned int chan; /* DMA channel */
- uint16_t *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 */
};
struct das1800_private {
@@ -572,7 +573,7 @@ static void das1800_handle_dma(struct comedi_device *dev,
flags = claim_dma_lock();
das1800_flush_dma_channel(dev, s, dma->chan, dma->virt_addr);
/* re-enable dma channel */
- set_dma_addr(dma->chan, virt_to_bus(dma->virt_addr));
+ set_dma_addr(dma->chan, dma->hw_addr);
set_dma_count(dma->chan, devpriv->dma_transfer_size);
enable_dma(dma->chan);
release_dma_lock(flags);
@@ -1013,7 +1014,7 @@ static void setup_dma(struct comedi_device *dev, const
struct comedi_cmd *cmd)
/* clear flip-flop to make sure 2-byte registers for
* count and address get set correctly */
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 appropriate size of transfer */
set_dma_count(dma->chan, devpriv->dma_transfer_size);
enable_dma(dma->chan);
@@ -1024,7 +1025,7 @@ static void setup_dma(struct comedi_device *dev, const
struct comedi_cmd *cmd)
/* clear flip-flop to make sure 2-byte registers for
* count and address get set correctly */
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 appropriate size of transfer */
set_dma_count(dma->chan, devpriv->dma_transfer_size);
enable_dma(dma->chan);
@@ -1288,7 +1289,8 @@ static int das1800_init_dma(struct comedi_device *dev,
}
dma->chan = dma_chan[i];
- dma->virt_addr = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
+ dma->virt_addr = dma_alloc_coherent(NULL, DMA_BUF_SIZE,
+ &dma->hw_addr, GFP_KERNEL);
if (!dma->virt_addr)
return -ENOMEM;
@@ -1520,7 +1522,9 @@ static void das1800_detach(struct comedi_device *dev)
dma = &devpriv->dma_desc[i];
if (dma->chan)
free_dma(dma->chan);
- kfree(dma->virt_addr);
+ if (dma->virt_addr)
+ dma_free_coherent(NULL, DMA_BUF_SIZE,
+ dma->virt_addr, dma->hw_addr);
}
kfree(devpriv->fifo_buf);
if (devpriv->iobase2)
--
2.0.3
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