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Subject[PATCH 1/7] parport_ip32: pass struct device to DMA API functions
Date
The DMA API generally relies on a struct device to work properly, and
only barely works without one for legacy reasons. Pass the easily
available struct device from the platform_device to remedy this.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/parport/parport_ip32.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/parport/parport_ip32.c b/drivers/parport/parport_ip32.c
index 62873070f988..b7a892791c3e 100644
--- a/drivers/parport/parport_ip32.c
+++ b/drivers/parport/parport_ip32.c
@@ -568,6 +568,7 @@ static irqreturn_t parport_ip32_merr_interrupt(int irq, void *dev_id)

/**
* parport_ip32_dma_start - begins a DMA transfer
+ * @p: partport to work on
* @dir: DMA direction: DMA_TO_DEVICE or DMA_FROM_DEVICE
* @addr: pointer to data buffer
* @count: buffer size
@@ -575,8 +576,8 @@ static irqreturn_t parport_ip32_merr_interrupt(int irq, void *dev_id)
* Calls to parport_ip32_dma_start() and parport_ip32_dma_stop() must be
* correctly balanced.
*/
-static int parport_ip32_dma_start(enum dma_data_direction dir,
- void *addr, size_t count)
+static int parport_ip32_dma_start(struct parport *p,
+ enum dma_data_direction dir, void *addr, size_t count)
{
unsigned int limit;
u64 ctrl;
@@ -601,7 +602,7 @@ static int parport_ip32_dma_start(enum dma_data_direction dir,

/* Prepare DMA pointers */
parport_ip32_dma.dir = dir;
- parport_ip32_dma.buf = dma_map_single(NULL, addr, count, dir);
+ parport_ip32_dma.buf = dma_map_single(&p->bus_dev, addr, count, dir);
parport_ip32_dma.len = count;
parport_ip32_dma.next = parport_ip32_dma.buf;
parport_ip32_dma.left = parport_ip32_dma.len;
@@ -625,11 +626,12 @@ static int parport_ip32_dma_start(enum dma_data_direction dir,

/**
* parport_ip32_dma_stop - ends a running DMA transfer
+ * @p: partport to work on
*
* Calls to parport_ip32_dma_start() and parport_ip32_dma_stop() must be
* correctly balanced.
*/
-static void parport_ip32_dma_stop(void)
+static void parport_ip32_dma_stop(struct parport *p)
{
u64 ctx_a;
u64 ctx_b;
@@ -685,8 +687,8 @@ static void parport_ip32_dma_stop(void)
enable_irq(MACEISA_PAR_CTXB_IRQ);
parport_ip32_dma.irq_on = 1;

- dma_unmap_single(NULL, parport_ip32_dma.buf, parport_ip32_dma.len,
- parport_ip32_dma.dir);
+ dma_unmap_single(&p->bus_dev, parport_ip32_dma.buf,
+ parport_ip32_dma.len, parport_ip32_dma.dir);
}

/**
@@ -1445,7 +1447,7 @@ static size_t parport_ip32_fifo_write_block_dma(struct parport *p,

priv->irq_mode = PARPORT_IP32_IRQ_HERE;

- parport_ip32_dma_start(DMA_TO_DEVICE, (void *)buf, len);
+ parport_ip32_dma_start(p, DMA_TO_DEVICE, (void *)buf, len);
reinit_completion(&priv->irq_complete);
parport_ip32_frob_econtrol(p, ECR_DMAEN | ECR_SERVINTR, ECR_DMAEN);

@@ -1461,7 +1463,7 @@ static size_t parport_ip32_fifo_write_block_dma(struct parport *p,
if (ecr & ECR_SERVINTR)
break; /* DMA transfer just finished */
}
- parport_ip32_dma_stop();
+ parport_ip32_dma_stop(p);
written = len - parport_ip32_dma_get_residue();

priv->irq_mode = PARPORT_IP32_IRQ_FWD;
--
2.20.1
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