[PATCH v3 36/59] dmaengine: bam-dma: Split device_control

Maxime Ripard
2014-10-22T16:04:35Z

Split the device_control callback of the Qualcomm BAM DMA driver to make use
of the newly introduced callbacks, that will eventually be used to retrieve
slave capabilities.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
drivers/dma/qcom_bam_dma.c | 85 +++++++++++++++++++++++-----------------------
1 file changed, 43 insertions(+), 42 deletions(-)

diff --git a/drivers/dma/qcom_bam_dma.c b/drivers/dma/qcom_bam_dma.c
index 7a4bbb0f80a5..03b1bf2afd4e 100644
--- a/drivers/dma/qcom_bam_dma.c
+++ b/drivers/dma/qcom_bam_dma.c
@@ -448,11 +448,18 @@ static void bam_free_chan(struct dma_chan *chan)
* Sets slave configuration for channel
*
*/
-static void bam_slave_config(struct bam_chan *bchan,
- struct dma_slave_config *cfg)
+static int bam_slave_config(struct dma_chan *chan,
+ struct dma_slave_config *cfg)
{
+ struct bam_chan *bchan = to_bam_chan(chan);
+ unsigned long flag;
+
+ spin_lock_irqsave(&bchan->vc.lock, flag);
memcpy(&bchan->slave, cfg, sizeof(*cfg));
bchan->reconfigure = 1;
+ spin_unlock_irqrestore(&bchan->vc.lock, flag);
+
+ return 0;
}

/**
@@ -545,8 +552,9 @@ err_out:
* No callbacks are done
*
*/
-static void bam_dma_terminate_all(struct bam_chan *bchan)
+static int bam_dma_terminate_all(struct dma_chan *chan)
{
+ struct bam_chan *bchan = to_bam_chan(chan);
unsigned long flag;
LIST_HEAD(head);

@@ -561,56 +569,46 @@ static void bam_dma_terminate_all(struct bam_chan *bchan)
spin_unlock_irqrestore(&bchan->vc.lock, flag);

vchan_dma_desc_free_list(&bchan->vc, &head);
+
+ return 0;
}

/**
- * bam_control - DMA device control
+ * bam_pause - Pause DMA channel
* @chan: dma channel
- * @cmd: control cmd
- * @arg: cmd argument
*
- * Perform DMA control command
+ */
+static int bam_pause(struct dma_chan *chan)
+{
+ struct bam_chan *bchan = to_bam_chan(chan);
+ struct bam_device *bdev = bchan->bdev;
+ unsigned long flag;
+
+ spin_lock_irqsave(&bchan->vc.lock, flag);
+ writel_relaxed(1, bdev->regs + BAM_P_HALT(bchan->id));
+ bchan->paused = 1;
+ spin_unlock_irqrestore(&bchan->vc.lock, flag);
+
+ return 0;
+}
+
+/**
+ * bam_resume - Resume DMA channel operations
+ * @chan: dma channel
*
*/
-static int bam_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
- unsigned long arg)
+static int bam_resume(struct dma_chan *chan)
{
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_device *bdev = bchan->bdev;
- int ret = 0;
unsigned long flag;

- switch (cmd) {
- case DMA_PAUSE:
- spin_lock_irqsave(&bchan->vc.lock, flag);
- writel_relaxed(1, bdev->regs + BAM_P_HALT(bchan->id));
- bchan->paused = 1;
- spin_unlock_irqrestore(&bchan->vc.lock, flag);
- break;
-
- case DMA_RESUME:
- spin_lock_irqsave(&bchan->vc.lock, flag);
- writel_relaxed(0, bdev->regs + BAM_P_HALT(bchan->id));
- bchan->paused = 0;
- spin_unlock_irqrestore(&bchan->vc.lock, flag);
- break;
-
- case DMA_TERMINATE_ALL:
- bam_dma_terminate_all(bchan);
- break;
-
- case DMA_SLAVE_CONFIG:
- spin_lock_irqsave(&bchan->vc.lock, flag);
- bam_slave_config(bchan, (struct dma_slave_config *)arg);
- spin_unlock_irqrestore(&bchan->vc.lock, flag);
- break;
-
- default:
- ret = -ENXIO;
- break;
- }
+ spin_lock_irqsave(&bchan->vc.lock, flag);
+ writel_relaxed(0, bdev->regs + BAM_P_HALT(bchan->id));
+ bchan->paused = 0;
+ spin_unlock_irqrestore(&bchan->vc.lock, flag);

- return ret;
+ return 0;
}

/**
@@ -1050,7 +1048,10 @@ static int bam_dma_probe(struct platform_device *pdev)
bdev->common.device_alloc_chan_resources = bam_alloc_chan;
bdev->common.device_free_chan_resources = bam_free_chan;
bdev->common.device_prep_slave_sg = bam_prep_slave_sg;
- bdev->common.device_control = bam_control;
+ bdev->common.device_config = bam_slave_config;
+ bdev->common.device_pause = bam_pause;
+ bdev->common.device_resume = bam_resume;
+ bdev->common.device_terminate_all = bam_dma_terminate_all;
bdev->common.device_issue_pending = bam_issue_pending;
bdev->common.device_tx_status = bam_tx_status;
bdev->common.dev = bdev->dev;
@@ -1089,7 +1090,7 @@ static int bam_dma_remove(struct platform_device *pdev)
devm_free_irq(bdev->dev, bdev->irq, bdev);

for (i = 0; i < bdev->num_channels; i++) {
- bam_dma_terminate_all(&bdev->channels[i]);
+ bam_dma_terminate_all(&bdev->channels[i].vc.chan);
tasklet_kill(&bdev->channels[i].vc.task);

dma_free_writecombine(bdev->dev, BAM_DESC_FIFO_SIZE,
--
2.1.1