[PATCH 0/3] Blackfin EMAC Driver updates for 2.6.27 (v2)

[PATCH 0/3] Blackfin EMAC Driver updates for 2.6.27 (v2)

[Bryan Wu]

Hi Jeff,

Please ignore the v1 patchset. I messed up something which Mike pointed out.

Thanks a lot
-Bryan

[PATCH 1/3] Blackfin EMAC Driver: add proper __devinit/__devexit markings

[Bryan Wu]

From: Mike Frysinger <vapier.adi@gmail.com>

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
 drivers/net/bfin_mac.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index 4144343..17951cb 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -956,7 +956,7 @@ static int bfin_mac_close(struct net_device *dev)
 	return 0;
 }
 
-static int __init bfin_mac_probe(struct platform_device *pdev)
+static int __devinit bfin_mac_probe(struct platform_device *pdev)
 {
 	struct net_device *ndev;
 	struct bfin_mac_local *lp;
@@ -1082,7 +1082,7 @@ out_err_probe_mac:
 	return rc;
 }
 
-static int bfin_mac_remove(struct platform_device *pdev)
+static int __devexit bfin_mac_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct bfin_mac_local *lp = netdev_priv(ndev);
@@ -1129,7 +1129,7 @@ static int bfin_mac_resume(struct platform_device *pdev)
 
 static struct platform_driver bfin_mac_driver = {
 	.probe = bfin_mac_probe,
-	.remove = bfin_mac_remove,
+	.remove = __devexit_p(bfin_mac_remove),
 	.resume = bfin_mac_resume,
 	.suspend = bfin_mac_suspend,
 	.driver = {
-- 
1.5.6

Re: [PATCH 1/3] Blackfin EMAC Driver: add proper __devinit/__devexit markings

[Paulius Zaleckas]

Bryan Wu wrote:
> From: Mike Frysinger <vapier.adi@gmail.com>
> 
> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
> Signed-off-by: Bryan Wu <cooloney@kernel.org>
> ---
>  drivers/net/bfin_mac.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
> index 4144343..17951cb 100644
> --- a/drivers/net/bfin_mac.c
> +++ b/drivers/net/bfin_mac.c
> @@ -956,7 +956,7 @@ static int bfin_mac_close(struct net_device *dev)
>  	return 0;
>  }
>  
> -static int __init bfin_mac_probe(struct platform_device *pdev)
> +static int __devinit bfin_mac_probe(struct platform_device *pdev)

__init was OK here.
__devinit is for hotplug devices

>  {
>  	struct net_device *ndev;
>  	struct bfin_mac_local *lp;
> @@ -1082,7 +1082,7 @@ out_err_probe_mac:
>  	return rc;
>  }
>  
> -static int bfin_mac_remove(struct platform_device *pdev)
> +static int __devexit bfin_mac_remove(struct platform_device *pdev)

__devexit is for hotplug, use __exit

>  {
>  	struct net_device *ndev = platform_get_drvdata(pdev);
>  	struct bfin_mac_local *lp = netdev_priv(ndev);
> @@ -1129,7 +1129,7 @@ static int bfin_mac_resume(struct platform_device *pdev)
>  
>  static struct platform_driver bfin_mac_driver = {
>  	.probe = bfin_mac_probe,

.probe shouldn't be declared here. And you should use
platform_device_probe() instead of platform_device_add()

> -	.remove = bfin_mac_remove,
> +	.remove = __devexit_p(bfin_mac_remove),

should be __exit_p()

>  	.resume = bfin_mac_resume,
>  	.suspend = bfin_mac_suspend,
>  	.driver = {

Re: [PATCH 1/3] Blackfin EMAC Driver: add proper __devinit/__devexit markings

[Bryan Wu]

On Mon, Jul 28, 2008 at 11:21 PM, Paulius Zaleckas
<paulius.zaleckas@teltonika.lt> wrote:
> Bryan Wu wrote:
>>
>> From: Mike Frysinger <vapier.adi@gmail.com>
>>
>> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
>> Signed-off-by: Bryan Wu <cooloney@kernel.org>
>> ---
>>  drivers/net/bfin_mac.c |    6 +++---
>>  1 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
>> index 4144343..17951cb 100644
>> --- a/drivers/net/bfin_mac.c
>> +++ b/drivers/net/bfin_mac.c
>> @@ -956,7 +956,7 @@ static int bfin_mac_close(struct net_device *dev)
>>        return 0;
>>  }
>>  -static int __init bfin_mac_probe(struct platform_device *pdev)
>> +static int __devinit bfin_mac_probe(struct platform_device *pdev)
>
> __init was OK here.
> __devinit is for hotplug devices
>
>>  {
>>        struct net_device *ndev;
>>        struct bfin_mac_local *lp;
>> @@ -1082,7 +1082,7 @@ out_err_probe_mac:
>>        return rc;
>>  }
>>  -static int bfin_mac_remove(struct platform_device *pdev)
>> +static int __devexit bfin_mac_remove(struct platform_device *pdev)
>
> __devexit is for hotplug, use __exit
>
>>  {
>>        struct net_device *ndev = platform_get_drvdata(pdev);
>>        struct bfin_mac_local *lp = netdev_priv(ndev);
>> @@ -1129,7 +1129,7 @@ static int bfin_mac_resume(struct platform_device
>> *pdev)
>>   static struct platform_driver bfin_mac_driver = {
>>        .probe = bfin_mac_probe,
>
> .probe shouldn't be declared here. And you should use
> platform_device_probe() instead of platform_device_add()
>

I failed to find platform_device_probe. Could you please provide some info?
.probe and .remove is very common in platform driver interface, isn't?
I don't know any difference between platform_device_probe() and
platform_device_add().

Thanks
-Bryan

>> -       .remove = bfin_mac_remove,
>> +       .remove = __devexit_p(bfin_mac_remove),
>
> should be __exit_p()
>
>>        .resume = bfin_mac_resume,
>>        .suspend = bfin_mac_suspend,
>>        .driver = {
>
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: [PATCH 1/3] Blackfin EMAC Driver: add proper __devinit/__devexit markings

[Jeff Garzik]

Bryan Wu wrote:
> From: Mike Frysinger <vapier.adi@gmail.com>
> 
> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
> Signed-off-by: Bryan Wu <cooloney@kernel.org>
> ---
>  drivers/net/bfin_mac.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
>

applied 1-3

[PATCH 2/3] Blackfin EMAC Driver: enable TXDWA new feature for new silicon (rev > 0.2)

[Bryan Wu]

Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
 drivers/net/bfin_mac.c |  103 ++++++++++++++++++++++++++++++++++++------------
 1 files changed, 77 insertions(+), 26 deletions(-)

diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index 17951cb..57ebe6d 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -606,36 +606,87 @@ adjust_head:
 static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
 				struct net_device *dev)
 {
-	unsigned int data;
+	u16 *data;
 
 	current_tx_ptr->skb = skb;
 
-	/*
-	 * Is skb->data always 16-bit aligned?
-	 * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
-	 */
-	if ((((unsigned int)(skb->data)) & 0x02) == 2) {
-		/* move skb->data to current_tx_ptr payload */
-		data = (unsigned int)(skb->data) - 2;
-		*((unsigned short *)data) = (unsigned short)(skb->len);
-		current_tx_ptr->desc_a.start_addr = (unsigned long)data;
-		/* this is important! */
-		blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
-
+	if (ANOMALY_05000285) {
+		/*
+		 * TXDWA feature is not avaible to older revision < 0.3 silicon
+		 * of BF537
+		 *
+		 * Only if data buffer is ODD WORD alignment, we do not
+		 * need to memcpy
+		 */
+		u32 data_align = (u32)(skb->data) & 0x3;
+		if (data_align == 0x2) {
+			/* move skb->data to current_tx_ptr payload */
+			data = (u16 *)(skb->data) - 1;
+			*data = (u16)(skb->len);
+			current_tx_ptr->desc_a.start_addr = (u32)data;
+			/* this is important! */
+			blackfin_dcache_flush_range((u32)data,
+					(u32)((u8 *)data + skb->len + 4));
+		} else {
+			*((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
+			memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
+				skb->len);
+			current_tx_ptr->desc_a.start_addr =
+				(u32)current_tx_ptr->packet;
+			if (current_tx_ptr->status.status_word != 0)
+				current_tx_ptr->status.status_word = 0;
+			blackfin_dcache_flush_range(
+				(u32)current_tx_ptr->packet,
+				(u32)(current_tx_ptr->packet + skb->len + 2));
+		}
 	} else {
-		*((unsigned short *)(current_tx_ptr->packet)) =
-		    (unsigned short)(skb->len);
-		memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
-		       (skb->len));
-		current_tx_ptr->desc_a.start_addr =
-		    (unsigned long)current_tx_ptr->packet;
-		if (current_tx_ptr->status.status_word != 0)
-			current_tx_ptr->status.status_word = 0;
-		blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
-					    packet,
-					    (unsigned int)(current_tx_ptr->
-							   packet + skb->len) +
-					    2);
+		/*
+		 * TXDWA feature is avaible to revision < 0.3 silicon of
+		 * BF537 and always avaible to BF52x
+		 */
+		u32 data_align = (u32)(skb->data) & 0x3;
+		if (data_align == 0x0) {
+			u16 sysctl = bfin_read_EMAC_SYSCTL();
+			sysctl |= TXDWA;
+			bfin_write_EMAC_SYSCTL(sysctl);
+
+			/* move skb->data to current_tx_ptr payload */
+			data = (u16 *)(skb->data) - 2;
+			*data = (u16)(skb->len);
+			current_tx_ptr->desc_a.start_addr = (u32)data;
+			/* this is important! */
+			blackfin_dcache_flush_range(
+					(u32)data,
+					(u32)((u8 *)data + skb->len + 4));
+		} else if (data_align == 0x2) {
+			u16 sysctl = bfin_read_EMAC_SYSCTL();
+			sysctl &= ~TXDWA;
+			bfin_write_EMAC_SYSCTL(sysctl);
+
+			/* move skb->data to current_tx_ptr payload */
+			data = (u16 *)(skb->data) - 1;
+			*data = (u16)(skb->len);
+			current_tx_ptr->desc_a.start_addr = (u32)data;
+			/* this is important! */
+			blackfin_dcache_flush_range(
+					(u32)data,
+					(u32)((u8 *)data + skb->len + 4));
+		} else {
+			u16 sysctl = bfin_read_EMAC_SYSCTL();
+			sysctl &= ~TXDWA;
+			bfin_write_EMAC_SYSCTL(sysctl);
+
+			*((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
+			memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
+				skb->len);
+			current_tx_ptr->desc_a.start_addr =
+				(u32)current_tx_ptr->packet;
+			if (current_tx_ptr->status.status_word != 0)
+				current_tx_ptr->status.status_word = 0;
+			blackfin_dcache_flush_range(
+				(u32)current_tx_ptr->packet,
+				(u32)(current_tx_ptr->packet + skb->len + 2));
+		}
 	}
 
 	/* enable this packet's dma */
-- 
1.5.6

[PATCH 3/3] Blackfin EMAC Driver: Functional power management support

[Bryan Wu]

From: Michael Hennerich <michael.hennerich@analog.com>

Reprogram MAC address after resume from Suspend Mem
(Blackfin Hibernate looses all CORE and SYSTEM register content)

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
 drivers/net/bfin_mac.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index 57ebe6d..69a6b9d 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -972,6 +972,7 @@ static int bfin_mac_open(struct net_device *dev)
 	phy_start(lp->phydev);
 	phy_write(lp->phydev, MII_BMCR, BMCR_RESET);
 	setup_system_regs(dev);
+	setup_mac_addr(dev->dev_addr);
 	bfin_mac_disable();
 	bfin_mac_enable();
 	pr_debug("hardware init finished\n");
-- 
1.5.6

[PATCH 0/3] Blackfin EMAC Driver updates for 2.6.27

[Bryan Wu]

Hi Jeff,

Please take a look at these Blackfin EMAC driver updates for 2.6.27

Thanks
-Bryan

[PATCH 2/3] Blackfin EMAC Driver: enable TXDWA new feature for new silicon (rev > 0.2)

[Bryan Wu]

Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
 drivers/net/bfin_mac.c |  103 ++++++++++++++++++++++++++++++++++++------------
 1 files changed, 77 insertions(+), 26 deletions(-)

diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index e18a7ee..57ebe6d 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -606,36 +606,87 @@ adjust_head:
 static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
 				struct net_device *dev)
 {
-	unsigned int data;
+	u16 *data;
 
 	current_tx_ptr->skb = skb;
 
-	/*
-	 * Is skb->data always 16-bit aligned?
-	 * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
-	 */
-	if ((((unsigned int)(skb->data)) & 0x01) == 0) {
-		/* move skb->data to current_tx_ptr payload */
-		data = (unsigned int)(skb->data) - 2;
-		*((unsigned short *)data) = (unsigned short)(skb->len);
-		current_tx_ptr->desc_a.start_addr = (unsigned long)data;
-		/* this is important! */
-		blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
-
+	if (ANOMALY_05000285) {
+		/*
+		 * TXDWA feature is not avaible to older revision < 0.3 silicon
+		 * of BF537
+		 *
+		 * Only if data buffer is ODD WORD alignment, we do not
+		 * need to memcpy
+		 */
+		u32 data_align = (u32)(skb->data) & 0x3;
+		if (data_align == 0x2) {
+			/* move skb->data to current_tx_ptr payload */
+			data = (u16 *)(skb->data) - 1;
+			*data = (u16)(skb->len);
+			current_tx_ptr->desc_a.start_addr = (u32)data;
+			/* this is important! */
+			blackfin_dcache_flush_range((u32)data,
+					(u32)((u8 *)data + skb->len + 4));
+		} else {
+			*((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
+			memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
+				skb->len);
+			current_tx_ptr->desc_a.start_addr =
+				(u32)current_tx_ptr->packet;
+			if (current_tx_ptr->status.status_word != 0)
+				current_tx_ptr->status.status_word = 0;
+			blackfin_dcache_flush_range(
+				(u32)current_tx_ptr->packet,
+				(u32)(current_tx_ptr->packet + skb->len + 2));
+		}
 	} else {
-		*((unsigned short *)(current_tx_ptr->packet)) =
-		    (unsigned short)(skb->len);
-		memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
-		       (skb->len));
-		current_tx_ptr->desc_a.start_addr =
-		    (unsigned long)current_tx_ptr->packet;
-		if (current_tx_ptr->status.status_word != 0)
-			current_tx_ptr->status.status_word = 0;
-		blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
-					    packet,
-					    (unsigned int)(current_tx_ptr->
-							   packet + skb->len) +
-					    2);
+		/*
+		 * TXDWA feature is avaible to revision < 0.3 silicon of
+		 * BF537 and always avaible to BF52x
+		 */
+		u32 data_align = (u32)(skb->data) & 0x3;
+		if (data_align == 0x0) {
+			u16 sysctl = bfin_read_EMAC_SYSCTL();
+			sysctl |= TXDWA;
+			bfin_write_EMAC_SYSCTL(sysctl);
+
+			/* move skb->data to current_tx_ptr payload */
+			data = (u16 *)(skb->data) - 2;
+			*data = (u16)(skb->len);
+			current_tx_ptr->desc_a.start_addr = (u32)data;
+			/* this is important! */
+			blackfin_dcache_flush_range(
+					(u32)data,
+					(u32)((u8 *)data + skb->len + 4));
+		} else if (data_align == 0x2) {
+			u16 sysctl = bfin_read_EMAC_SYSCTL();
+			sysctl &= ~TXDWA;
+			bfin_write_EMAC_SYSCTL(sysctl);
+
+			/* move skb->data to current_tx_ptr payload */
+			data = (u16 *)(skb->data) - 1;
+			*data = (u16)(skb->len);
+			current_tx_ptr->desc_a.start_addr = (u32)data;
+			/* this is important! */
+			blackfin_dcache_flush_range(
+					(u32)data,
+					(u32)((u8 *)data + skb->len + 4));
+		} else {
+			u16 sysctl = bfin_read_EMAC_SYSCTL();
+			sysctl &= ~TXDWA;
+			bfin_write_EMAC_SYSCTL(sysctl);
+
+			*((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
+			memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
+				skb->len);
+			current_tx_ptr->desc_a.start_addr =
+				(u32)current_tx_ptr->packet;
+			if (current_tx_ptr->status.status_word != 0)
+				current_tx_ptr->status.status_word = 0;
+			blackfin_dcache_flush_range(
+				(u32)current_tx_ptr->packet,
+				(u32)(current_tx_ptr->packet + skb->len + 2));
+		}
 	}
 
 	/* enable this packet's dma */
-- 
1.5.6

Re: [PATCH 2/3] Blackfin EMAC Driver: enable TXDWA new feature for new silicon (rev > 0.2)

[Ingo Oeser]

Hi Bryan,

you duplicate a lot of clever code here. 
Would you mind refactoring this part in a follow-up patch?

Bryan Wu schrieb:
> Signed-off-by: Bryan Wu <cooloney@kernel.org>
> ---
>  drivers/net/bfin_mac.c |  103 ++++++++++++++++++++++++++++++++++++------------
>  1 files changed, 77 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
> index e18a7ee..57ebe6d 100644
> --- a/drivers/net/bfin_mac.c
> +++ b/drivers/net/bfin_mac.c
> @@ -606,36 +606,87 @@ adjust_head:
>  static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
>  				struct net_device *dev)
>  {
> -	unsigned int data;
> +	u16 *data;
>  
>  	current_tx_ptr->skb = skb;
>  
> -	/*
> -	 * Is skb->data always 16-bit aligned?
> -	 * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
> -	 */
> -	if ((((unsigned int)(skb->data)) & 0x01) == 0) {
> -		/* move skb->data to current_tx_ptr payload */
> -		data = (unsigned int)(skb->data) - 2;
> -		*((unsigned short *)data) = (unsigned short)(skb->len);
> -		current_tx_ptr->desc_a.start_addr = (unsigned long)data;
> -		/* this is important! */
> -		blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
> -
> +	if (ANOMALY_05000285) {
> +		/*
> +		 * TXDWA feature is not avaible to older revision < 0.3 silicon
> +		 * of BF537
> +		 *
> +		 * Only if data buffer is ODD WORD alignment, we do not
> +		 * need to memcpy
> +		 */
> +		u32 data_align = (u32)(skb->data) & 0x3;
> +		if (data_align == 0x2) {
> +			/* move skb->data to current_tx_ptr payload */
> +			data = (u16 *)(skb->data) - 1;
> +			*data = (u16)(skb->len);
> +			current_tx_ptr->desc_a.start_addr = (u32)data;
> +			/* this is important! */
> +			blackfin_dcache_flush_range((u32)data,
> +					(u32)((u8 *)data + skb->len + 4));
> +		} else {
> +			*((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
> +			memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
> +				skb->len);
> +			current_tx_ptr->desc_a.start_addr =
> +				(u32)current_tx_ptr->packet;
> +			if (current_tx_ptr->status.status_word != 0)
> +				current_tx_ptr->status.status_word = 0;
> +			blackfin_dcache_flush_range(
> +				(u32)current_tx_ptr->packet,
> +				(u32)(current_tx_ptr->packet + skb->len + 2));
> +		}
>  	} else {
> -		*((unsigned short *)(current_tx_ptr->packet)) =
> -		    (unsigned short)(skb->len);
> -		memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
> -		       (skb->len));
> -		current_tx_ptr->desc_a.start_addr =
> -		    (unsigned long)current_tx_ptr->packet;
> -		if (current_tx_ptr->status.status_word != 0)
> -			current_tx_ptr->status.status_word = 0;
> -		blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
> -					    packet,
> -					    (unsigned int)(current_tx_ptr->
> -							   packet + skb->len) +
> -					    2);
> +		/*
> +		 * TXDWA feature is avaible to revision < 0.3 silicon of
> +		 * BF537 and always avaible to BF52x
> +		 */
> +		u32 data_align = (u32)(skb->data) & 0x3;
> +		if (data_align == 0x0) {

This condition seems to be the only part dependend on "ANOMALY_05000285".

> +			u16 sysctl = bfin_read_EMAC_SYSCTL();
> +			sysctl |= TXDWA;
> +			bfin_write_EMAC_SYSCTL(sysctl);
> +
> +			/* move skb->data to current_tx_ptr payload */
> +			data = (u16 *)(skb->data) - 2;
> +			*data = (u16)(skb->len);
> +			current_tx_ptr->desc_a.start_addr = (u32)data;
> +			/* this is important! */
> +			blackfin_dcache_flush_range(
> +					(u32)data,
> +					(u32)((u8 *)data + skb->len + 4));
> +		} else if (data_align == 0x2) {
> +			u16 sysctl = bfin_read_EMAC_SYSCTL();
> +			sysctl &= ~TXDWA;
> +			bfin_write_EMAC_SYSCTL(sysctl);
> +
> +			/* move skb->data to current_tx_ptr payload */
> +			data = (u16 *)(skb->data) - 1;
> +			*data = (u16)(skb->len);
> +			current_tx_ptr->desc_a.start_addr = (u32)data;
> +			/* this is important! */
> +			blackfin_dcache_flush_range(
> +					(u32)data,
> +					(u32)((u8 *)data + skb->len + 4));
> +		} else {
> +			u16 sysctl = bfin_read_EMAC_SYSCTL();
> +			sysctl &= ~TXDWA;
> +			bfin_write_EMAC_SYSCTL(sysctl);
> +
> +			*((u16 *)(current_tx_ptr->packet)) = (u16)(skb->len);
> +			memcpy((u8 *)(current_tx_ptr->packet + 2), skb->data,
> +				skb->len);
> +			current_tx_ptr->desc_a.start_addr =
> +				(u32)current_tx_ptr->packet;
> +			if (current_tx_ptr->status.status_word != 0)
> +				current_tx_ptr->status.status_word = 0;
> +			blackfin_dcache_flush_range(
> +				(u32)current_tx_ptr->packet,
> +				(u32)(current_tx_ptr->packet + skb->len + 2));
> +		}
>  	}
>  
>  	/* enable this packet's dma */

Best Regards

Ingo Oeser