staging: comedi: pcl816: 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>

diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index c48ee22..59c17e6 100644 (file)
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -179,7 +179,7 @@ config COMEDI_PCL812
 
 config COMEDI_PCL816
        tristate "Advantech PCL-814 and PCL-816 ISA card support"
-       depends on VIRT_TO_BUS && ISA_DMA_API
+       depends on ISA_DMA_API
        ---help---
          Enable support for Advantech PCL-814 and PCL-816 ISA cards
 

diff --git a/drivers/staging/comedi/drivers/pcl816.c b/drivers/staging/comedi/drivers/pcl816.c
index 49c1f17..1b76085 100644 (file)
--- a/drivers/staging/comedi/drivers/pcl816.c
+++ b/drivers/staging/comedi/drivers/pcl816.c
@@ -114,13 +114,12 @@ static const struct pcl816_board boardtypes[] = {
 };
 
 struct pcl816_dma_desc {
-       unsigned long virt_addr;        /* virtual address of DMA buffer */
-       unsigned int hw_addr;   /* hardware (bus) address of DMA buffer */
+       void *virt_addr;        /* virtual address of DMA buffer */
+       dma_addr_t hw_addr;     /* hardware (bus) address of DMA buffer */
 };
 
 struct pcl816_private {
        unsigned int dma;       /*  used DMA, 0=don't use DMA */
-       unsigned int dmapages;
        unsigned int hwdmasize;
        struct pcl816_dma_desc dma_desc[2];
        int cur_dma;
@@ -345,8 +344,7 @@ static irqreturn_t pcl816_interrupt(int irq, void *d)
        bufptr = devpriv->ai_poll_ptr;
        devpriv->ai_poll_ptr = 0;
 
-       transfer_from_dma_buf(dev, s, (unsigned short *)dma->virt_addr,
-                             bufptr, len);
+       transfer_from_dma_buf(dev, s, dma->virt_addr, bufptr, len);
 
        pcl816_ai_clear_eoc(dev);
 
@@ -552,7 +550,7 @@ static int pcl816_ai_poll(struct comedi_device *dev, struct comedi_subdevice *s)
                return 0;
        }
 
-       transfer_from_dma_buf(dev, s, (unsigned short *)dma->virt_addr,
+       transfer_from_dma_buf(dev, s, dma->virt_addr,
                              devpriv->ai_poll_ptr, top2);
 
        devpriv->ai_poll_ptr = top1;    /*  new buffer position */
@@ -693,16 +691,15 @@ static int pcl816_alloc_dma(struct comedi_device *dev,
        dev->irq = irq_num;
        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->virt_addr = __get_dma_pages(GFP_KERNEL, devpriv->dmapages);
+               dma->virt_addr = dma_alloc_coherent(NULL, devpriv->hwdmasize,
+                                                   &dma->hw_addr, GFP_KERNEL);
                if (!dma->virt_addr)
                        return -ENOMEM;
-               dma->hw_addr = virt_to_bus((void *)dma->virt_addr);
        }
        return 0;
 }
@@ -721,7 +718,8 @@ static void pcl816_free_dma(struct comedi_device *dev)
        for (i = 0; i < 2; i++) {
                dma = &devpriv->dma_desc[i];
                if (dma->virt_addr)
-                       free_pages(dma->virt_addr, devpriv->dmapages);
+                       dma_free_coherent(NULL, devpriv->hwdmasize,
+                                         dma->virt_addr, dma->hw_addr);
        }
 }