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staging: comedi: das1800: 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>
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parent
6e89008b06
commit
a4b064ee46
2 changed files with 11 additions and 7 deletions
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@ -309,7 +309,7 @@ config COMEDI_DAS800
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config COMEDI_DAS1800
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tristate "DAS1800 and compatible ISA card support"
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depends on VIRT_TO_BUS && ISA_DMA_API
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depends on ISA_DMA_API
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---help---
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Enable support for DAS1800 and compatible ISA cards
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Keithley Metrabyte DAS-1701ST, DAS-1701ST-DA, DAS-1701/AO,
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@ -422,7 +422,8 @@ static const struct das1800_board das1800_boards[] = {
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struct das1800_dma_desc {
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unsigned int chan; /* DMA channel */
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uint16_t *virt_addr; /* virtual address of DMA buffer */
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void *virt_addr; /* virtual address of DMA buffer */
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dma_addr_t hw_addr; /* hardware (bus) address of DMA buffer */
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};
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struct das1800_private {
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@ -572,7 +573,7 @@ static void das1800_handle_dma(struct comedi_device *dev,
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flags = claim_dma_lock();
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das1800_flush_dma_channel(dev, s, dma->chan, dma->virt_addr);
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/* re-enable dma channel */
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set_dma_addr(dma->chan, virt_to_bus(dma->virt_addr));
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set_dma_addr(dma->chan, dma->hw_addr);
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set_dma_count(dma->chan, devpriv->dma_transfer_size);
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enable_dma(dma->chan);
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release_dma_lock(flags);
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@ -1013,7 +1014,7 @@ static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
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/* clear flip-flop to make sure 2-byte registers for
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* count and address get set correctly */
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clear_dma_ff(dma->chan);
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set_dma_addr(dma->chan, virt_to_bus(dma->virt_addr));
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set_dma_addr(dma->chan, dma->hw_addr);
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/* set appropriate size of transfer */
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set_dma_count(dma->chan, devpriv->dma_transfer_size);
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enable_dma(dma->chan);
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@ -1024,7 +1025,7 @@ static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
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/* clear flip-flop to make sure 2-byte registers for
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* count and address get set correctly */
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clear_dma_ff(dma->chan);
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set_dma_addr(dma->chan, virt_to_bus(dma->virt_addr));
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set_dma_addr(dma->chan, dma->hw_addr);
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/* set appropriate size of transfer */
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set_dma_count(dma->chan, devpriv->dma_transfer_size);
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enable_dma(dma->chan);
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@ -1288,7 +1289,8 @@ static int das1800_init_dma(struct comedi_device *dev,
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}
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dma->chan = dma_chan[i];
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dma->virt_addr = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
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dma->virt_addr = dma_alloc_coherent(NULL, DMA_BUF_SIZE,
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&dma->hw_addr, GFP_KERNEL);
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if (!dma->virt_addr)
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return -ENOMEM;
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@ -1520,7 +1522,9 @@ static void das1800_detach(struct comedi_device *dev)
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dma = &devpriv->dma_desc[i];
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if (dma->chan)
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free_dma(dma->chan);
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kfree(dma->virt_addr);
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if (dma->virt_addr)
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dma_free_coherent(NULL, DMA_BUF_SIZE,
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dma->virt_addr, dma->hw_addr);
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}
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kfree(devpriv->fifo_buf);
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if (devpriv->iobase2)
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