diff mbox series

[v3,06/12] dmaengine: stm32-dma3: add DMA_CYCLIC capability

Message ID 20240520154948.690697-7-amelie.delaunay@foss.st.com (mailing list archive)
State New, archived
Headers show
Series Introduce STM32 DMA3 support | expand

Commit Message

Amelie Delaunay May 20, 2024, 3:49 p.m. UTC 
Add DMA_CYCLIC capability and relative device_prep_dma_cyclic ops with
stm32_dma3_prep_dma_cyclic(). It reuses stm32_dma3_chan_prep_hw() and
stm32_dma3_chan_prep_hwdesc() helpers.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
---
 drivers/dma/stm32/stm32-dma3.c | 77 ++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

Comments

Frank Li May 20, 2024, 6:41 p.m. UTC | #1 
On Mon, May 20, 2024 at 05:49:42PM +0200, Amelie Delaunay wrote:
> Add DMA_CYCLIC capability and relative device_prep_dma_cyclic ops with
> stm32_dma3_prep_dma_cyclic(). It reuses stm32_dma3_chan_prep_hw() and
> stm32_dma3_chan_prep_hwdesc() helpers.
> 
> Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
> ---
>  drivers/dma/stm32/stm32-dma3.c | 77 ++++++++++++++++++++++++++++++++++
>  1 file changed, 77 insertions(+)
> 
> diff --git a/drivers/dma/stm32/stm32-dma3.c b/drivers/dma/stm32/stm32-dma3.c
> index 134c08a7ee96..aae9fc018b1d 100644
> --- a/drivers/dma/stm32/stm32-dma3.c
> +++ b/drivers/dma/stm32/stm32-dma3.c
> @@ -1021,6 +1021,81 @@ static struct dma_async_tx_descriptor *stm32_dma3_prep_slave_sg(struct dma_chan
>  	return NULL;
>  }
>  
> +static struct dma_async_tx_descriptor *stm32_dma3_prep_dma_cyclic(struct dma_chan *c,
> +								  dma_addr_t buf_addr,
> +								  size_t buf_len, size_t period_len,
> +								  enum dma_transfer_direction dir,
> +								  unsigned long flags)
> +{
> +	struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c);
> +	struct stm32_dma3_swdesc *swdesc;
> +	dma_addr_t src, dst;
> +	u32 count, i, ctr1, ctr2;
> +	int ret;
> +
> +	if (!buf_len || !period_len || period_len > STM32_DMA3_MAX_BLOCK_SIZE) {
> +		dev_err(chan2dev(chan), "Invalid buffer/period length\n");
> +		return NULL;
> +	}
> +
> +	if (buf_len % period_len) {
> +		dev_err(chan2dev(chan), "Buffer length not multiple of period length\n");
> +		return NULL;
> +	}
> +
> +	count = buf_len / period_len;
> +	swdesc = stm32_dma3_chan_desc_alloc(chan, count);
> +	if (!swdesc)
> +		return NULL;
> +
> +	if (dir == DMA_MEM_TO_DEV) {
> +		src = buf_addr;
> +		dst = chan->dma_config.dst_addr;
> +
> +		ret = stm32_dma3_chan_prep_hw(chan, DMA_MEM_TO_DEV, &swdesc->ccr, &ctr1, &ctr2,
> +					      src, dst, period_len);
> +	} else if (dir == DMA_DEV_TO_MEM) {
> +		src = chan->dma_config.src_addr;
> +		dst = buf_addr;
> +
> +		ret = stm32_dma3_chan_prep_hw(chan, DMA_DEV_TO_MEM, &swdesc->ccr, &ctr1, &ctr2,
> +					      src, dst, period_len);
> +	} else {
> +		dev_err(chan2dev(chan), "Invalid direction\n");
> +		ret = -EINVAL;
> +	}
> +
> +	if (ret)
> +		goto err_desc_free;
> +
> +	for (i = 0; i < count; i++) {
> +		if (dir == DMA_MEM_TO_DEV) {
> +			src = buf_addr + i * period_len;
> +			dst = chan->dma_config.dst_addr;
> +		} else { /* (dir == DMA_DEV_TO_MEM || dir == DMA_MEM_TO_MEM) */

look like comment is wrong.

DMA_MEM_TO_MEM will return -EINVAL at previous check. 

> +			src = chan->dma_config.src_addr;
> +			dst = buf_addr + i * period_len;
> +		}
> +
> +		stm32_dma3_chan_prep_hwdesc(chan, swdesc, i, src, dst, period_len,
> +					    ctr1, ctr2, i == (count - 1), true);
> +	}
> +
> +	/* Enable Error interrupts */
> +	swdesc->ccr |= CCR_USEIE | CCR_ULEIE | CCR_DTEIE;
> +	/* Enable Transfer state interrupts */
> +	swdesc->ccr |= CCR_TCIE;
> +
> +	swdesc->cyclic = true;
> +
> +	return vchan_tx_prep(&chan->vchan, &swdesc->vdesc, flags);
> +
> +err_desc_free:
> +	stm32_dma3_chan_desc_free(chan, swdesc);
> +
> +	return NULL;
> +}
> +
>  static void stm32_dma3_caps(struct dma_chan *c, struct dma_slave_caps *caps)
>  {
>  	struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c);
> @@ -1255,6 +1330,7 @@ static int stm32_dma3_probe(struct platform_device *pdev)
>  
>  	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
>  	dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
> +	dma_cap_set(DMA_CYCLIC, dma_dev->cap_mask);
>  	dma_dev->dev = &pdev->dev;
>  	/*
>  	 * This controller supports up to 8-byte buswidth depending on the port used and the
> @@ -1277,6 +1353,7 @@ static int stm32_dma3_probe(struct platform_device *pdev)
>  	dma_dev->device_alloc_chan_resources = stm32_dma3_alloc_chan_resources;
>  	dma_dev->device_free_chan_resources = stm32_dma3_free_chan_resources;
>  	dma_dev->device_prep_slave_sg = stm32_dma3_prep_slave_sg;
> +	dma_dev->device_prep_dma_cyclic = stm32_dma3_prep_dma_cyclic;
>  	dma_dev->device_caps = stm32_dma3_caps;
>  	dma_dev->device_config = stm32_dma3_config;
>  	dma_dev->device_terminate_all = stm32_dma3_terminate_all;
> -- 
> 2.25.1
>
Amelie Delaunay May 27, 2024, 8:41 a.m. UTC | #2 
On 5/20/24 20:41, Frank Li wrote:
> On Mon, May 20, 2024 at 05:49:42PM +0200, Amelie Delaunay wrote:
>> Add DMA_CYCLIC capability and relative device_prep_dma_cyclic ops with
>> stm32_dma3_prep_dma_cyclic(). It reuses stm32_dma3_chan_prep_hw() and
>> stm32_dma3_chan_prep_hwdesc() helpers.
>>
>> Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
>> ---
>>   drivers/dma/stm32/stm32-dma3.c | 77 ++++++++++++++++++++++++++++++++++
>>   1 file changed, 77 insertions(+)
>>
>> diff --git a/drivers/dma/stm32/stm32-dma3.c b/drivers/dma/stm32/stm32-dma3.c
>> index 134c08a7ee96..aae9fc018b1d 100644
>> --- a/drivers/dma/stm32/stm32-dma3.c
>> +++ b/drivers/dma/stm32/stm32-dma3.c
>> @@ -1021,6 +1021,81 @@ static struct dma_async_tx_descriptor *stm32_dma3_prep_slave_sg(struct dma_chan
>>   	return NULL;
>>   }
>>   
>> +static struct dma_async_tx_descriptor *stm32_dma3_prep_dma_cyclic(struct dma_chan *c,
>> +								  dma_addr_t buf_addr,
>> +								  size_t buf_len, size_t period_len,
>> +								  enum dma_transfer_direction dir,
>> +								  unsigned long flags)
>> +{
>> +	struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c);
>> +	struct stm32_dma3_swdesc *swdesc;
>> +	dma_addr_t src, dst;
>> +	u32 count, i, ctr1, ctr2;
>> +	int ret;
>> +
>> +	if (!buf_len || !period_len || period_len > STM32_DMA3_MAX_BLOCK_SIZE) {
>> +		dev_err(chan2dev(chan), "Invalid buffer/period length\n");
>> +		return NULL;
>> +	}
>> +
>> +	if (buf_len % period_len) {
>> +		dev_err(chan2dev(chan), "Buffer length not multiple of period length\n");
>> +		return NULL;
>> +	}
>> +
>> +	count = buf_len / period_len;
>> +	swdesc = stm32_dma3_chan_desc_alloc(chan, count);
>> +	if (!swdesc)
>> +		return NULL;
>> +
>> +	if (dir == DMA_MEM_TO_DEV) {
>> +		src = buf_addr;
>> +		dst = chan->dma_config.dst_addr;
>> +
>> +		ret = stm32_dma3_chan_prep_hw(chan, DMA_MEM_TO_DEV, &swdesc->ccr, &ctr1, &ctr2,
>> +					      src, dst, period_len);
>> +	} else if (dir == DMA_DEV_TO_MEM) {
>> +		src = chan->dma_config.src_addr;
>> +		dst = buf_addr;
>> +
>> +		ret = stm32_dma3_chan_prep_hw(chan, DMA_DEV_TO_MEM, &swdesc->ccr, &ctr1, &ctr2,
>> +					      src, dst, period_len);
>> +	} else {
>> +		dev_err(chan2dev(chan), "Invalid direction\n");
>> +		ret = -EINVAL;
>> +	}
>> +
>> +	if (ret)
>> +		goto err_desc_free;
>> +
>> +	for (i = 0; i < count; i++) {
>> +		if (dir == DMA_MEM_TO_DEV) {
>> +			src = buf_addr + i * period_len;
>> +			dst = chan->dma_config.dst_addr;
>> +		} else { /* (dir == DMA_DEV_TO_MEM || dir == DMA_MEM_TO_MEM) */
> 
> look like comment is wrong.
> 
> DMA_MEM_TO_MEM will return -EINVAL at previous check.
> 

Indeed. I'll fix it in v4.

>> +			src = chan->dma_config.src_addr;
>> +			dst = buf_addr + i * period_len;
>> +		}
>> +
>> +		stm32_dma3_chan_prep_hwdesc(chan, swdesc, i, src, dst, period_len,
>> +					    ctr1, ctr2, i == (count - 1), true);
>> +	}
>> +
>> +	/* Enable Error interrupts */
>> +	swdesc->ccr |= CCR_USEIE | CCR_ULEIE | CCR_DTEIE;
>> +	/* Enable Transfer state interrupts */
>> +	swdesc->ccr |= CCR_TCIE;
>> +
>> +	swdesc->cyclic = true;
>> +
>> +	return vchan_tx_prep(&chan->vchan, &swdesc->vdesc, flags);
>> +
>> +err_desc_free:
>> +	stm32_dma3_chan_desc_free(chan, swdesc);
>> +
>> +	return NULL;
>> +}
>> +
>>   static void stm32_dma3_caps(struct dma_chan *c, struct dma_slave_caps *caps)
>>   {
>>   	struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c);
>> @@ -1255,6 +1330,7 @@ static int stm32_dma3_probe(struct platform_device *pdev)
>>   
>>   	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
>>   	dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
>> +	dma_cap_set(DMA_CYCLIC, dma_dev->cap_mask);
>>   	dma_dev->dev = &pdev->dev;
>>   	/*
>>   	 * This controller supports up to 8-byte buswidth depending on the port used and the
>> @@ -1277,6 +1353,7 @@ static int stm32_dma3_probe(struct platform_device *pdev)
>>   	dma_dev->device_alloc_chan_resources = stm32_dma3_alloc_chan_resources;
>>   	dma_dev->device_free_chan_resources = stm32_dma3_free_chan_resources;
>>   	dma_dev->device_prep_slave_sg = stm32_dma3_prep_slave_sg;
>> +	dma_dev->device_prep_dma_cyclic = stm32_dma3_prep_dma_cyclic;
>>   	dma_dev->device_caps = stm32_dma3_caps;
>>   	dma_dev->device_config = stm32_dma3_config;
>>   	dma_dev->device_terminate_all = stm32_dma3_terminate_all;
>> -- 
>> 2.25.1
>>
diff mbox series

Patch

diff --git a/drivers/dma/stm32/stm32-dma3.c b/drivers/dma/stm32/stm32-dma3.c
index 134c08a7ee96..aae9fc018b1d 100644
--- a/drivers/dma/stm32/stm32-dma3.c
+++ b/drivers/dma/stm32/stm32-dma3.c
@@ -1021,6 +1021,81 @@  static struct dma_async_tx_descriptor *stm32_dma3_prep_slave_sg(struct dma_chan
 	return NULL;
 }
 
+static struct dma_async_tx_descriptor *stm32_dma3_prep_dma_cyclic(struct dma_chan *c,
+								  dma_addr_t buf_addr,
+								  size_t buf_len, size_t period_len,
+								  enum dma_transfer_direction dir,
+								  unsigned long flags)
+{
+	struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c);
+	struct stm32_dma3_swdesc *swdesc;
+	dma_addr_t src, dst;
+	u32 count, i, ctr1, ctr2;
+	int ret;
+
+	if (!buf_len || !period_len || period_len > STM32_DMA3_MAX_BLOCK_SIZE) {
+		dev_err(chan2dev(chan), "Invalid buffer/period length\n");
+		return NULL;
+	}
+
+	if (buf_len % period_len) {
+		dev_err(chan2dev(chan), "Buffer length not multiple of period length\n");
+		return NULL;
+	}
+
+	count = buf_len / period_len;
+	swdesc = stm32_dma3_chan_desc_alloc(chan, count);
+	if (!swdesc)
+		return NULL;
+
+	if (dir == DMA_MEM_TO_DEV) {
+		src = buf_addr;
+		dst = chan->dma_config.dst_addr;
+
+		ret = stm32_dma3_chan_prep_hw(chan, DMA_MEM_TO_DEV, &swdesc->ccr, &ctr1, &ctr2,
+					      src, dst, period_len);
+	} else if (dir == DMA_DEV_TO_MEM) {
+		src = chan->dma_config.src_addr;
+		dst = buf_addr;
+
+		ret = stm32_dma3_chan_prep_hw(chan, DMA_DEV_TO_MEM, &swdesc->ccr, &ctr1, &ctr2,
+					      src, dst, period_len);
+	} else {
+		dev_err(chan2dev(chan), "Invalid direction\n");
+		ret = -EINVAL;
+	}
+
+	if (ret)
+		goto err_desc_free;
+
+	for (i = 0; i < count; i++) {
+		if (dir == DMA_MEM_TO_DEV) {
+			src = buf_addr + i * period_len;
+			dst = chan->dma_config.dst_addr;
+		} else { /* (dir == DMA_DEV_TO_MEM || dir == DMA_MEM_TO_MEM) */
+			src = chan->dma_config.src_addr;
+			dst = buf_addr + i * period_len;
+		}
+
+		stm32_dma3_chan_prep_hwdesc(chan, swdesc, i, src, dst, period_len,
+					    ctr1, ctr2, i == (count - 1), true);
+	}
+
+	/* Enable Error interrupts */
+	swdesc->ccr |= CCR_USEIE | CCR_ULEIE | CCR_DTEIE;
+	/* Enable Transfer state interrupts */
+	swdesc->ccr |= CCR_TCIE;
+
+	swdesc->cyclic = true;
+
+	return vchan_tx_prep(&chan->vchan, &swdesc->vdesc, flags);
+
+err_desc_free:
+	stm32_dma3_chan_desc_free(chan, swdesc);
+
+	return NULL;
+}
+
 static void stm32_dma3_caps(struct dma_chan *c, struct dma_slave_caps *caps)
 {
 	struct stm32_dma3_chan *chan = to_stm32_dma3_chan(c);
@@ -1255,6 +1330,7 @@  static int stm32_dma3_probe(struct platform_device *pdev)
 
 	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
 	dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
+	dma_cap_set(DMA_CYCLIC, dma_dev->cap_mask);
 	dma_dev->dev = &pdev->dev;
 	/*
 	 * This controller supports up to 8-byte buswidth depending on the port used and the
@@ -1277,6 +1353,7 @@  static int stm32_dma3_probe(struct platform_device *pdev)
 	dma_dev->device_alloc_chan_resources = stm32_dma3_alloc_chan_resources;
 	dma_dev->device_free_chan_resources = stm32_dma3_free_chan_resources;
 	dma_dev->device_prep_slave_sg = stm32_dma3_prep_slave_sg;
+	dma_dev->device_prep_dma_cyclic = stm32_dma3_prep_dma_cyclic;
 	dma_dev->device_caps = stm32_dma3_caps;
 	dma_dev->device_config = stm32_dma3_config;
 	dma_dev->device_terminate_all = stm32_dma3_terminate_all;