[PATCH] dmaengine: fsl-edma: dma map slave device address

[PATCH] dmaengine: fsl-edma: dma map slave device address

[Laurentiu Tudor]

This mapping needs to be created in order for slave dma transfers
to work on systems with SMMU. The implementation mostly mimics the
one in pl330 dma driver, authored by Robin Murphy.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Suggested-by: Robin Murphy <robin.murphy@arm.com>
---
Original approach was to add the missing mappings in the i2c client driver,
see here for discussion: https://patchwork.ozlabs.org/patch/1026013/

 drivers/dma/fsl-edma-common.c | 66 ++++++++++++++++++++++++++++++++---
 drivers/dma/fsl-edma-common.h |  4 +++
 drivers/dma/fsl-edma.c        |  1 +
 drivers/dma/mcf-edma.c        |  1 +
 4 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index 8876c4c1bb2c..0e95ee24b6d4 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -6,6 +6,7 @@
 #include <linux/dmapool.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/dma-mapping.h>
 
 #include "fsl-edma-common.h"
 
@@ -173,12 +174,62 @@ int fsl_edma_resume(struct dma_chan *chan)
 }
 EXPORT_SYMBOL_GPL(fsl_edma_resume);
 
+static void fsl_edma_unprep_slave_dma(struct fsl_edma_chan *fsl_chan)
+{
+	if (fsl_chan->dma_dir != DMA_NONE)
+		dma_unmap_resource(fsl_chan->vchan.chan.device->dev,
+				   fsl_chan->dma_dev_addr,
+				   fsl_chan->dma_dev_size,
+				   fsl_chan->dma_dir, 0);
+	fsl_chan->dma_dir = DMA_NONE;
+}
+
+static bool fsl_edma_prep_slave_dma(struct fsl_edma_chan *fsl_chan,
+				    enum dma_transfer_direction dir)
+{
+	struct device *dev = fsl_chan->vchan.chan.device->dev;
+	enum dma_data_direction dma_dir;
+	phys_addr_t addr = 0;
+	u32 size = 0;
+
+	switch (dir) {
+	case DMA_MEM_TO_DEV:
+		dma_dir = DMA_FROM_DEVICE;
+		addr = fsl_chan->cfg.dst_addr;
+		size = fsl_chan->cfg.dst_maxburst;
+		break;
+	case DMA_DEV_TO_MEM:
+		dma_dir = DMA_TO_DEVICE;
+		addr = fsl_chan->cfg.src_addr;
+		size = fsl_chan->cfg.src_maxburst;
+		break;
+	default:
+		dma_dir = DMA_NONE;
+		break;
+	}
+
+	/* Already mapped for this config? */
+	if (fsl_chan->dma_dir == dma_dir)
+		return true;
+
+	fsl_edma_unprep_slave_dma(fsl_chan);
+
+	fsl_chan->dma_dev_addr = dma_map_resource(dev, addr, size, dma_dir, 0);
+	if (dma_mapping_error(dev, fsl_chan->dma_dev_addr))
+		return false;
+	fsl_chan->dma_dev_size = size;
+	fsl_chan->dma_dir = dma_dir;
+
+	return true;
+}
+
 int fsl_edma_slave_config(struct dma_chan *chan,
 				 struct dma_slave_config *cfg)
 {
 	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
 
 	memcpy(&fsl_chan->cfg, cfg, sizeof(*cfg));
+	fsl_edma_unprep_slave_dma(fsl_chan);
 
 	return 0;
 }
@@ -378,6 +429,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 	if (!is_slave_direction(direction))
 		return NULL;
 
+	if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
+		return NULL;
+
 	sg_len = buf_len / period_len;
 	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 	if (!fsl_desc)
@@ -409,11 +463,11 @@ struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
 
 		if (direction == DMA_MEM_TO_DEV) {
 			src_addr = dma_buf_next;
-			dst_addr = fsl_chan->cfg.dst_addr;
+			dst_addr = fsl_chan->dma_dev_addr;
 			soff = fsl_chan->cfg.dst_addr_width;
 			doff = 0;
 		} else {
-			src_addr = fsl_chan->cfg.src_addr;
+			src_addr = fsl_chan->dma_dev_addr;
 			dst_addr = dma_buf_next;
 			soff = 0;
 			doff = fsl_chan->cfg.src_addr_width;
@@ -444,6 +498,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 	if (!is_slave_direction(direction))
 		return NULL;
 
+	if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
+		return NULL;
+
 	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
 	if (!fsl_desc)
 		return NULL;
@@ -468,11 +525,11 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
 
 		if (direction == DMA_MEM_TO_DEV) {
 			src_addr = sg_dma_address(sg);
-			dst_addr = fsl_chan->cfg.dst_addr;
+			dst_addr = fsl_chan->dma_dev_addr;
 			soff = fsl_chan->cfg.dst_addr_width;
 			doff = 0;
 		} else {
-			src_addr = fsl_chan->cfg.src_addr;
+			src_addr = fsl_chan->dma_dev_addr;
 			dst_addr = sg_dma_address(sg);
 			soff = 0;
 			doff = fsl_chan->cfg.src_addr_width;
@@ -555,6 +612,7 @@ void fsl_edma_free_chan_resources(struct dma_chan *chan)
 	fsl_edma_chan_mux(fsl_chan, 0, false);
 	fsl_chan->edesc = NULL;
 	vchan_get_all_descriptors(&fsl_chan->vchan, &head);
+	fsl_edma_unprep_slave_dma(fsl_chan);
 	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 
 	vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
index 8917e8865959..b435d8e1e3a1 100644
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -6,6 +6,7 @@
 #ifndef _FSL_EDMA_COMMON_H_
 #define _FSL_EDMA_COMMON_H_
 
+#include <linux/dma-direction.h>
 #include "virt-dma.h"
 
 #define EDMA_CR_EDBG		BIT(1)
@@ -120,6 +121,9 @@ struct fsl_edma_chan {
 	struct dma_slave_config		cfg;
 	u32				attr;
 	struct dma_pool			*tcd_pool;
+	dma_addr_t			dma_dev_addr;
+	u32				dma_dev_size;
+	enum dma_data_direction		dma_dir;
 };
 
 struct fsl_edma_desc {
diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index 34d70112fcc9..75e8a7ba3a22 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -254,6 +254,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
 		fsl_chan->pm_state = RUNNING;
 		fsl_chan->slave_id = 0;
 		fsl_chan->idle = true;
+		fsl_chan->dma_dir = DMA_NONE;
 		fsl_chan->vchan.desc_free = fsl_edma_free_desc;
 		vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
 
diff --git a/drivers/dma/mcf-edma.c b/drivers/dma/mcf-edma.c
index 5de1b07eddff..7de54b2fafdb 100644
--- a/drivers/dma/mcf-edma.c
+++ b/drivers/dma/mcf-edma.c
@@ -214,6 +214,7 @@ static int mcf_edma_probe(struct platform_device *pdev)
 		mcf_chan->edma = mcf_edma;
 		mcf_chan->slave_id = i;
 		mcf_chan->idle = true;
+		mcf_chan->dma_dir = DMA_NONE;
 		mcf_chan->vchan.desc_free = fsl_edma_free_desc;
 		vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev);
 		iowrite32(0x0, &regs->tcd[i].csr);
-- 
2.17.1

Re: [PATCH] dmaengine: fsl-edma: dma map slave device address

[Angelo Dureghello]

Hi Laurentiu,

On Fri, Jan 18, 2019 at 12:06:23PM +0200, Laurentiu Tudor wrote:
> This mapping needs to be created in order for slave dma transfers
> to work on systems with SMMU. The implementation mostly mimics the
> one in pl330 dma driver, authored by Robin Murphy.
> 
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
> Suggested-by: Robin Murphy <robin.murphy@arm.com>
> ---
> Original approach was to add the missing mappings in the i2c client driver,
> see here for discussion: https://patchwork.ozlabs.org/patch/1026013/
> 
>  drivers/dma/fsl-edma-common.c | 66 ++++++++++++++++++++++++++++++++---
>  drivers/dma/fsl-edma-common.h |  4 +++
>  drivers/dma/fsl-edma.c        |  1 +
>  drivers/dma/mcf-edma.c        |  1 +
>  4 files changed, 68 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
> index 8876c4c1bb2c..0e95ee24b6d4 100644
> --- a/drivers/dma/fsl-edma-common.c
> +++ b/drivers/dma/fsl-edma-common.c
> @@ -6,6 +6,7 @@
>  #include <linux/dmapool.h>
>  #include <linux/module.h>
>  #include <linux/slab.h>
> +#include <linux/dma-mapping.h>
>  
>  #include "fsl-edma-common.h"
>  
> @@ -173,12 +174,62 @@ int fsl_edma_resume(struct dma_chan *chan)
>  }
>  EXPORT_SYMBOL_GPL(fsl_edma_resume);
>  
> +static void fsl_edma_unprep_slave_dma(struct fsl_edma_chan *fsl_chan)
> +{
> +	if (fsl_chan->dma_dir != DMA_NONE)
> +		dma_unmap_resource(fsl_chan->vchan.chan.device->dev,
> +				   fsl_chan->dma_dev_addr,
> +				   fsl_chan->dma_dev_size,
> +				   fsl_chan->dma_dir, 0);
> +	fsl_chan->dma_dir = DMA_NONE;
> +}
> +
> +static bool fsl_edma_prep_slave_dma(struct fsl_edma_chan *fsl_chan,
> +				    enum dma_transfer_direction dir)
> +{
> +	struct device *dev = fsl_chan->vchan.chan.device->dev;
> +	enum dma_data_direction dma_dir;
> +	phys_addr_t addr = 0;
> +	u32 size = 0;
> +
> +	switch (dir) {
> +	case DMA_MEM_TO_DEV:
> +		dma_dir = DMA_FROM_DEVICE;
> +		addr = fsl_chan->cfg.dst_addr;
> +		size = fsl_chan->cfg.dst_maxburst;
> +		break;
> +	case DMA_DEV_TO_MEM:
> +		dma_dir = DMA_TO_DEVICE;
> +		addr = fsl_chan->cfg.src_addr;
> +		size = fsl_chan->cfg.src_maxburst;
> +		break;
> +	default:
> +		dma_dir = DMA_NONE;
> +		break;
> +	}
> +
> +	/* Already mapped for this config? */
> +	if (fsl_chan->dma_dir == dma_dir)
> +		return true;
> +
> +	fsl_edma_unprep_slave_dma(fsl_chan);
> +
> +	fsl_chan->dma_dev_addr = dma_map_resource(dev, addr, size, dma_dir, 0);
> +	if (dma_mapping_error(dev, fsl_chan->dma_dev_addr))
> +		return false;
> +	fsl_chan->dma_dev_size = size;
> +	fsl_chan->dma_dir = dma_dir;
> +
> +	return true;
> +}
> +
>  int fsl_edma_slave_config(struct dma_chan *chan,
>  				 struct dma_slave_config *cfg)
>  {
>  	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
>  
>  	memcpy(&fsl_chan->cfg, cfg, sizeof(*cfg));
> +	fsl_edma_unprep_slave_dma(fsl_chan);
>  
>  	return 0;
>  }
> @@ -378,6 +429,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
>  	if (!is_slave_direction(direction))
>  		return NULL;
>  
> +	if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
> +		return NULL;
> +
>  	sg_len = buf_len / period_len;
>  	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
>  	if (!fsl_desc)
> @@ -409,11 +463,11 @@ struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
>  
>  		if (direction == DMA_MEM_TO_DEV) {
>  			src_addr = dma_buf_next;
> -			dst_addr = fsl_chan->cfg.dst_addr;
> +			dst_addr = fsl_chan->dma_dev_addr;
>  			soff = fsl_chan->cfg.dst_addr_width;
>  			doff = 0;
>  		} else {
> -			src_addr = fsl_chan->cfg.src_addr;
> +			src_addr = fsl_chan->dma_dev_addr;
>  			dst_addr = dma_buf_next;
>  			soff = 0;
>  			doff = fsl_chan->cfg.src_addr_width;
> @@ -444,6 +498,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
>  	if (!is_slave_direction(direction))
>  		return NULL;
>  
> +	if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
> +		return NULL;
> +
>  	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
>  	if (!fsl_desc)
>  		return NULL;
> @@ -468,11 +525,11 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
>  
>  		if (direction == DMA_MEM_TO_DEV) {
>  			src_addr = sg_dma_address(sg);
> -			dst_addr = fsl_chan->cfg.dst_addr;
> +			dst_addr = fsl_chan->dma_dev_addr;
>  			soff = fsl_chan->cfg.dst_addr_width;
>  			doff = 0;
>  		} else {
> -			src_addr = fsl_chan->cfg.src_addr;
> +			src_addr = fsl_chan->dma_dev_addr;
>  			dst_addr = sg_dma_address(sg);
>  			soff = 0;
>  			doff = fsl_chan->cfg.src_addr_width;
> @@ -555,6 +612,7 @@ void fsl_edma_free_chan_resources(struct dma_chan *chan)
>  	fsl_edma_chan_mux(fsl_chan, 0, false);
>  	fsl_chan->edesc = NULL;
>  	vchan_get_all_descriptors(&fsl_chan->vchan, &head);
> +	fsl_edma_unprep_slave_dma(fsl_chan);
>  	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
>  
>  	vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
> diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
> index 8917e8865959..b435d8e1e3a1 100644
> --- a/drivers/dma/fsl-edma-common.h
> +++ b/drivers/dma/fsl-edma-common.h
> @@ -6,6 +6,7 @@
>  #ifndef _FSL_EDMA_COMMON_H_
>  #define _FSL_EDMA_COMMON_H_
>  
> +#include <linux/dma-direction.h>
>  #include "virt-dma.h"
>  
>  #define EDMA_CR_EDBG		BIT(1)
> @@ -120,6 +121,9 @@ struct fsl_edma_chan {
>  	struct dma_slave_config		cfg;
>  	u32				attr;
>  	struct dma_pool			*tcd_pool;
> +	dma_addr_t			dma_dev_addr;
> +	u32				dma_dev_size;
> +	enum dma_data_direction		dma_dir;
>  };
>  
>  struct fsl_edma_desc {
> diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
> index 34d70112fcc9..75e8a7ba3a22 100644
> --- a/drivers/dma/fsl-edma.c
> +++ b/drivers/dma/fsl-edma.c
> @@ -254,6 +254,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
>  		fsl_chan->pm_state = RUNNING;
>  		fsl_chan->slave_id = 0;
>  		fsl_chan->idle = true;
> +		fsl_chan->dma_dir = DMA_NONE;
>  		fsl_chan->vchan.desc_free = fsl_edma_free_desc;
>  		vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
>  
> diff --git a/drivers/dma/mcf-edma.c b/drivers/dma/mcf-edma.c
> index 5de1b07eddff..7de54b2fafdb 100644
> --- a/drivers/dma/mcf-edma.c
> +++ b/drivers/dma/mcf-edma.c
> @@ -214,6 +214,7 @@ static int mcf_edma_probe(struct platform_device *pdev)
>  		mcf_chan->edma = mcf_edma;
>  		mcf_chan->slave_id = i;
>  		mcf_chan->idle = true;
> +		mcf_chan->dma_dir = DMA_NONE;
>  		mcf_chan->vchan.desc_free = fsl_edma_free_desc;
>  		vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev);
>  		iowrite32(0x0, &regs->tcd[i].csr);
> -- 
> 2.17.1
> 

I tested this patch on:

- Vybrid VF50N (Toradex Colibri VF50)
- ColdFire mcf54415 (Sysam stmark2 board)

and dma still works properly.

Tested-by: Angelo Dureghello <angelo@sysam.it>

Re: [PATCH] dmaengine: fsl-edma: dma map slave device address

[Laurentiu Tudor]

Hi Angelo,

On 18.01.2019 23:50, Angelo Dureghello wrote:
> Hi Laurentiu,
> 
> On Fri, Jan 18, 2019 at 12:06:23PM +0200, Laurentiu Tudor wrote:
>> This mapping needs to be created in order for slave dma transfers
>> to work on systems with SMMU. The implementation mostly mimics the
>> one in pl330 dma driver, authored by Robin Murphy.
>>
>> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
>> Suggested-by: Robin Murphy <robin.murphy@arm.com>
>> ---
>> Original approach was to add the missing mappings in the i2c client driver,
>> see here for discussion: https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatchwork.ozlabs.org%2Fpatch%2F1026013%2F&amp;data=02%7C01%7Claurentiu.tudor%40nxp.com%7C7861dfe95dfb4fceeb8208d67d907488%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C1%7C636834456718898365&amp;sdata=XM5shQdcIRgFLtCmuRuFtViR6ttPDWI%2BNHXoPi68Xs8%3D&amp;reserved=0
>>
>>   drivers/dma/fsl-edma-common.c | 66 ++++++++++++++++++++++++++++++++---
>>   drivers/dma/fsl-edma-common.h |  4 +++
>>   drivers/dma/fsl-edma.c        |  1 +
>>   drivers/dma/mcf-edma.c        |  1 +
>>   4 files changed, 68 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
>> index 8876c4c1bb2c..0e95ee24b6d4 100644
>> --- a/drivers/dma/fsl-edma-common.c
>> +++ b/drivers/dma/fsl-edma-common.c
>> @@ -6,6 +6,7 @@
>>   #include <linux/dmapool.h>
>>   #include <linux/module.h>
>>   #include <linux/slab.h>
>> +#include <linux/dma-mapping.h>
>>   
>>   #include "fsl-edma-common.h"
>>   
>> @@ -173,12 +174,62 @@ int fsl_edma_resume(struct dma_chan *chan)
>>   }
>>   EXPORT_SYMBOL_GPL(fsl_edma_resume);
>>   
>> +static void fsl_edma_unprep_slave_dma(struct fsl_edma_chan *fsl_chan)
>> +{
>> +	if (fsl_chan->dma_dir != DMA_NONE)
>> +		dma_unmap_resource(fsl_chan->vchan.chan.device->dev,
>> +				   fsl_chan->dma_dev_addr,
>> +				   fsl_chan->dma_dev_size,
>> +				   fsl_chan->dma_dir, 0);
>> +	fsl_chan->dma_dir = DMA_NONE;
>> +}
>> +
>> +static bool fsl_edma_prep_slave_dma(struct fsl_edma_chan *fsl_chan,
>> +				    enum dma_transfer_direction dir)
>> +{
>> +	struct device *dev = fsl_chan->vchan.chan.device->dev;
>> +	enum dma_data_direction dma_dir;
>> +	phys_addr_t addr = 0;
>> +	u32 size = 0;
>> +
>> +	switch (dir) {
>> +	case DMA_MEM_TO_DEV:
>> +		dma_dir = DMA_FROM_DEVICE;
>> +		addr = fsl_chan->cfg.dst_addr;
>> +		size = fsl_chan->cfg.dst_maxburst;
>> +		break;
>> +	case DMA_DEV_TO_MEM:
>> +		dma_dir = DMA_TO_DEVICE;
>> +		addr = fsl_chan->cfg.src_addr;
>> +		size = fsl_chan->cfg.src_maxburst;
>> +		break;
>> +	default:
>> +		dma_dir = DMA_NONE;
>> +		break;
>> +	}
>> +
>> +	/* Already mapped for this config? */
>> +	if (fsl_chan->dma_dir == dma_dir)
>> +		return true;
>> +
>> +	fsl_edma_unprep_slave_dma(fsl_chan);
>> +
>> +	fsl_chan->dma_dev_addr = dma_map_resource(dev, addr, size, dma_dir, 0);
>> +	if (dma_mapping_error(dev, fsl_chan->dma_dev_addr))
>> +		return false;
>> +	fsl_chan->dma_dev_size = size;
>> +	fsl_chan->dma_dir = dma_dir;
>> +
>> +	return true;
>> +}
>> +
>>   int fsl_edma_slave_config(struct dma_chan *chan,
>>   				 struct dma_slave_config *cfg)
>>   {
>>   	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
>>   
>>   	memcpy(&fsl_chan->cfg, cfg, sizeof(*cfg));
>> +	fsl_edma_unprep_slave_dma(fsl_chan);
>>   
>>   	return 0;
>>   }
>> @@ -378,6 +429,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
>>   	if (!is_slave_direction(direction))
>>   		return NULL;
>>   
>> +	if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
>> +		return NULL;
>> +
>>   	sg_len = buf_len / period_len;
>>   	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
>>   	if (!fsl_desc)
>> @@ -409,11 +463,11 @@ struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
>>   
>>   		if (direction == DMA_MEM_TO_DEV) {
>>   			src_addr = dma_buf_next;
>> -			dst_addr = fsl_chan->cfg.dst_addr;
>> +			dst_addr = fsl_chan->dma_dev_addr;
>>   			soff = fsl_chan->cfg.dst_addr_width;
>>   			doff = 0;
>>   		} else {
>> -			src_addr = fsl_chan->cfg.src_addr;
>> +			src_addr = fsl_chan->dma_dev_addr;
>>   			dst_addr = dma_buf_next;
>>   			soff = 0;
>>   			doff = fsl_chan->cfg.src_addr_width;
>> @@ -444,6 +498,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
>>   	if (!is_slave_direction(direction))
>>   		return NULL;
>>   
>> +	if (!fsl_edma_prep_slave_dma(fsl_chan, direction))
>> +		return NULL;
>> +
>>   	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);
>>   	if (!fsl_desc)
>>   		return NULL;
>> @@ -468,11 +525,11 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
>>   
>>   		if (direction == DMA_MEM_TO_DEV) {
>>   			src_addr = sg_dma_address(sg);
>> -			dst_addr = fsl_chan->cfg.dst_addr;
>> +			dst_addr = fsl_chan->dma_dev_addr;
>>   			soff = fsl_chan->cfg.dst_addr_width;
>>   			doff = 0;
>>   		} else {
>> -			src_addr = fsl_chan->cfg.src_addr;
>> +			src_addr = fsl_chan->dma_dev_addr;
>>   			dst_addr = sg_dma_address(sg);
>>   			soff = 0;
>>   			doff = fsl_chan->cfg.src_addr_width;
>> @@ -555,6 +612,7 @@ void fsl_edma_free_chan_resources(struct dma_chan *chan)
>>   	fsl_edma_chan_mux(fsl_chan, 0, false);
>>   	fsl_chan->edesc = NULL;
>>   	vchan_get_all_descriptors(&fsl_chan->vchan, &head);
>> +	fsl_edma_unprep_slave_dma(fsl_chan);
>>   	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
>>   
>>   	vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
>> diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
>> index 8917e8865959..b435d8e1e3a1 100644
>> --- a/drivers/dma/fsl-edma-common.h
>> +++ b/drivers/dma/fsl-edma-common.h
>> @@ -6,6 +6,7 @@
>>   #ifndef _FSL_EDMA_COMMON_H_
>>   #define _FSL_EDMA_COMMON_H_
>>   
>> +#include <linux/dma-direction.h>
>>   #include "virt-dma.h"
>>   
>>   #define EDMA_CR_EDBG		BIT(1)
>> @@ -120,6 +121,9 @@ struct fsl_edma_chan {
>>   	struct dma_slave_config		cfg;
>>   	u32				attr;
>>   	struct dma_pool			*tcd_pool;
>> +	dma_addr_t			dma_dev_addr;
>> +	u32				dma_dev_size;
>> +	enum dma_data_direction		dma_dir;
>>   };
>>   
>>   struct fsl_edma_desc {
>> diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
>> index 34d70112fcc9..75e8a7ba3a22 100644
>> --- a/drivers/dma/fsl-edma.c
>> +++ b/drivers/dma/fsl-edma.c
>> @@ -254,6 +254,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
>>   		fsl_chan->pm_state = RUNNING;
>>   		fsl_chan->slave_id = 0;
>>   		fsl_chan->idle = true;
>> +		fsl_chan->dma_dir = DMA_NONE;
>>   		fsl_chan->vchan.desc_free = fsl_edma_free_desc;
>>   		vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);
>>   
>> diff --git a/drivers/dma/mcf-edma.c b/drivers/dma/mcf-edma.c
>> index 5de1b07eddff..7de54b2fafdb 100644
>> --- a/drivers/dma/mcf-edma.c
>> +++ b/drivers/dma/mcf-edma.c
>> @@ -214,6 +214,7 @@ static int mcf_edma_probe(struct platform_device *pdev)
>>   		mcf_chan->edma = mcf_edma;
>>   		mcf_chan->slave_id = i;
>>   		mcf_chan->idle = true;
>> +		mcf_chan->dma_dir = DMA_NONE;
>>   		mcf_chan->vchan.desc_free = fsl_edma_free_desc;
>>   		vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev);
>>   		iowrite32(0x0, &regs->tcd[i].csr);
>> -- 
>> 2.17.1
>>
> 
> I tested this patch on:
> 
> - Vybrid VF50N (Toradex Colibri VF50)
> - ColdFire mcf54415 (Sysam stmark2 board)
> 
> and dma still works properly.
> 
> Tested-by: Angelo Dureghello <angelo@sysam.it>
> 

Thanks a lot for testing!

---
Best Regards, Laurentiu

Re: [PATCH] dmaengine: fsl-edma: dma map slave device address

[Vinod Koul]

On 18-01-19, 12:06, Laurentiu Tudor wrote:
> This mapping needs to be created in order for slave dma transfers
> to work on systems with SMMU. The implementation mostly mimics the
> one in pl330 dma driver, authored by Robin Murphy.

Applied, thanks

-- 
~Vinod