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staging: comedi: gsc_hpdi: tidy up comments

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Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2015-05-05 18:47:24 +01:00 • committed by Greg Kroah-Hartman
parent 4a72a7af46
commit dc05a7d70b
1 changed files with 34 additions and 25 deletions
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27
drivers/staging/comedi/drivers/gsc_hpdi.c
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@ -142,8 +142,10 @@ struct hpdi_private {
uint32_t *dio_buffer[NUM_DMA_BUFFERS]; /* dma buffers */
/* physical addresses of dma buffers */
dma_addr_t dio_buffer_phys_addr[NUM_DMA_BUFFERS];
/* array of dma descriptors read by plx9080, allocated to get proper
* alignment */
/*
* array of dma descriptors read by plx9080, allocated to get proper
* alignment
*/
struct plx_dma_desc *dma_desc;
/* physical address of dma descriptor array */
dma_addr_t dma_desc_phys_addr;
@ -226,7 +228,8 @@ static irqreturn_t gsc_hpdi_interrupt(int irq, void *d)
/* spin lock makes sure no one else changes plx dma control reg */
spin_lock_irqsave(&dev->spinlock, flags);
dma0_status = readb(devpriv->plx9080_mmio + PLX_DMA0_CS_REG);
if (plx_status & ICS_DMA0_A) { /* dma chan 0 interrupt */
if (plx_status & ICS_DMA0_A) {
/* dma chan 0 interrupt */
writeb((dma0_status & PLX_DMA_EN_BIT) | PLX_CLEAR_DMA_INTR_BIT,
devpriv->plx9080_mmio + PLX_DMA0_CS_REG);
@ -238,14 +241,16 @@ static irqreturn_t gsc_hpdi_interrupt(int irq, void *d)
/* spin lock makes sure no one else changes plx dma control reg */
spin_lock_irqsave(&dev->spinlock, flags);
dma1_status = readb(devpriv->plx9080_mmio + PLX_DMA1_CS_REG);
if (plx_status & ICS_DMA1_A) { /* XXX *//* dma chan 1 interrupt */
if (plx_status & ICS_DMA1_A) {
/* XXX */ /* dma chan 1 interrupt */
writeb((dma1_status & PLX_DMA_EN_BIT) | PLX_CLEAR_DMA_INTR_BIT,
devpriv->plx9080_mmio + PLX_DMA1_CS_REG);
}
spin_unlock_irqrestore(&dev->spinlock, flags);
/* clear possible plx9080 interrupt sources */
if (plx_status & ICS_LDIA) { /* clear local doorbell interrupt */
if (plx_status & ICS_LDIA) {
/* clear local doorbell interrupt */
plx_bits = readl(devpriv->plx9080_mmio + PLX_DBR_OUT_REG);
writel(plx_bits, devpriv->plx9080_mmio + PLX_DBR_OUT_REG);
}
@ -576,11 +581,15 @@ static void gsc_hpdi_init_plx9080(struct comedi_device *dev)
bits |= PLX_DMA_EN_READYIN_BIT;
/* enable dma chaining */
bits |= PLX_EN_CHAIN_BIT;
/* enable interrupt on dma done
* (probably don't need this, since chain never finishes) */
/*
* enable interrupt on dma done
* (probably don't need this, since chain never finishes)
*/
bits |= PLX_EN_DMA_DONE_INTR_BIT;
/* don't increment local address during transfers
* (we are transferring from a fixed fifo register) */
/*
* don't increment local address during transfers
* (we are transferring from a fixed fifo register)
*/
bits |= PLX_LOCAL_ADDR_CONST_BIT;
/* route dma interrupt to pci bus */
bits |= PLX_DMA_INTR_PCI_BIT;