[PATCH 1/3] ibm_newemac: Allow the "no flow control" EMAC feature to work

[PATCH 1/3] ibm_newemac: Allow the "no flow control" EMAC feature to work

[Josh Boyer]

Some PowerPC 40x chips have errata that force us not to use the integrated
flow control.  We have the feature defined, but it currently can't be used
because it is never added to EMAC_FTRS_POSSIBLE.

This adds a Kconfig option for affected platforms to select and puts the
feature in the EMAC_FTRS_POSSIBLE list.  This is set for PowerPC 405EZ
platforms as well.

Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
---
 drivers/net/ibm_newemac/Kconfig |    4 ++++
 drivers/net/ibm_newemac/core.c  |    2 ++
 drivers/net/ibm_newemac/core.h  |    3 +++
 3 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ibm_newemac/Kconfig b/drivers/net/ibm_newemac/Kconfig
index 70a3272..dfb6547 100644
--- a/drivers/net/ibm_newemac/Kconfig
+++ b/drivers/net/ibm_newemac/Kconfig
@@ -62,3 +62,7 @@ config IBM_NEW_EMAC_TAH
 config IBM_NEW_EMAC_EMAC4
 	bool
 	default n
+
+config IBM_NEW_EMAC_NO_FLOW_CTRL
+	bool
+	default n
diff --git a/drivers/net/ibm_newemac/core.c b/drivers/net/ibm_newemac/core.c
index 2e720f2..2442361 100644
--- a/drivers/net/ibm_newemac/core.c
+++ b/drivers/net/ibm_newemac/core.c
@@ -2567,6 +2567,8 @@ static int __devinit emac_init_config(struct emac_instance *dev)
 		if (of_device_is_compatible(np, "ibm,emac-440ep") ||
 		    of_device_is_compatible(np, "ibm,emac-440gr"))
 			dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
+		if (of_device_is_compatible(np, "ibm,emac-405ez"))
+			dev->features |= EMAC_FTR_NO_FLOW_CONTROL_40x;
 	}
 
 	/* Fixup some feature bits based on the device tree */
diff --git a/drivers/net/ibm_newemac/core.h b/drivers/net/ibm_newemac/core.h
index 6545e69..59e5a5d 100644
--- a/drivers/net/ibm_newemac/core.h
+++ b/drivers/net/ibm_newemac/core.h
@@ -341,6 +341,9 @@ enum {
 #ifdef CONFIG_IBM_NEW_EMAC_RGMII
 	    EMAC_FTR_HAS_RGMII	|
 #endif
+#ifdef CONFIG_IBM_NEW_EMAC_NO_FLOW_CTRL
+	    EMAC_FTR_NO_FLOW_CONTROL_40x |
+#endif
 	EMAC_FTR_440EP_PHY_CLK_FIX,
 };
 
-- 
1.5.5.1

[PATCH 2/3 v2] ibm_newemac: Introduce mal_has_feature

[Josh Boyer]

There are some PowerPC SoCs that do odd things with the MAL handling.  In
order to accommodate them, we need to introduce a feature mechanism that is
similar to the existing emac_has_feature function.

This adds a feature variable to the mal_instance structure, and adds a
mal_has_feature function.  Two features are defined and are guarded
by Kconfig options that are selected by the affected platforms.

MAL_FTR_CLEAR_ICINSTAT is used for platforms that need to clear the
interrupt bits in the ICINTSTAT SDR for txeob/rxeob.  This is common
on MAL implementations that have interrupt coalescing.

MAL_FTR_COMMON_ERR_INT is used for platforms that have SERR, TXDE,
and RXDE OR'd into a single interrupt bit.

Signed-of-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
---
 drivers/net/ibm_newemac/Kconfig |    8 ++++++++
 drivers/net/ibm_newemac/mal.h   |   34 ++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ibm_newemac/Kconfig b/drivers/net/ibm_newemac/Kconfig
index dfb6547..44e5a0e 100644
--- a/drivers/net/ibm_newemac/Kconfig
+++ b/drivers/net/ibm_newemac/Kconfig
@@ -66,3 +66,11 @@ config IBM_NEW_EMAC_EMAC4
 config IBM_NEW_EMAC_NO_FLOW_CTRL
 	bool
 	default n
+
+config IBM_NEW_EMAC_MAL_CLR_ICINTSTAT
+	bool
+	default n
+
+config IBM_NEW_EMAC_MAL_COMMON_ERR
+	bool
+	default n
diff --git a/drivers/net/ibm_newemac/mal.h b/drivers/net/ibm_newemac/mal.h
index eaa7262..0b24138 100644
--- a/drivers/net/ibm_newemac/mal.h
+++ b/drivers/net/ibm_newemac/mal.h
@@ -213,6 +213,8 @@ struct mal_instance {
 	struct of_device	*ofdev;
 	int			index;
 	spinlock_t		lock;
+
+	unsigned int features;
 };
 
 static inline u32 get_mal_dcrn(struct mal_instance *mal, int reg)
@@ -225,6 +227,38 @@ static inline void set_mal_dcrn(struct mal_instance *mal, int reg, u32 val)
 	dcr_write(mal->dcr_host, reg, val);
 }
 
+/* Features of various MAL implementations */
+
+/* Set if you have interrupt coalescing and you have to clear the SDR
+ * register for TXEOB and RXEOB interrupts to work
+ */
+#define MAL_FTR_CLEAR_ICINTSTAT	0x00000001
+
+/* Set if your MAL has SERR, TXDE, and RXDE OR'd into a single UIC
+ * interrupt
+ */
+#define MAL_FTR_COMMON_ERR_INT	0x00000002
+
+enum {
+	MAL_FTRS_ALWAYS = 0,
+
+	MAL_FTRS_POSSIBLE =
+#ifdef CONFIG_IBM_NEW_EMAC_MAL_CLR_ICINTSTAT
+		MAL_FTR_CLEAR_ICINTSTAT |
+#endif
+#ifdef CONFIG_IBM_NEW_EMAC_MAL_COMMON_ERR
+		MAL_FTR_COMMON_ERR_INT |
+#endif
+		0,
+};
+
+static inline int mal_has_feature(struct mal_instance *dev,
+		unsigned long feature)
+{
+	return (MAL_FTRS_ALWAYS & feature) ||
+		(MAL_FTRS_POSSIBLE & dev->features & feature);
+}
+
 /* Register MAL devices */
 int mal_init(void);
 void mal_exit(void);
-- 
1.5.5.1

[PATCH 3/3 v2] ibm_newemac: MAL support for PowerPC 405EZ

[Josh Boyer]

The PowerPC 405EZ SoC has some differences in the interrupt layout and
handling for the MAL.  The SERR, TXDE, and RXDE interrupts are OR'd into
a single interrupt.  Also, due to the possibility for interrupt coalescing,
the TXEOB and RXEOB interrupts require an interrupt bit to be cleared in
the ICINTSTAT SDR.

This sets the proper MAL feature bits for 405EZ boards, and adds a common
shared handler for SERR, TXDE, and RXDE.  The defines for the ICINTSTAT DCR
are added to the proper header file as well.

This has been adapted from code originally written by Stefan Roese.

Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/dcr-regs.h |    7 ++++
 drivers/net/ibm_newemac/mal.c       |   60 ++++++++++++++++++++++++++++++++---
 2 files changed, 62 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/dcr-regs.h b/arch/powerpc/include/asm/dcr-regs.h
index 29b0ece..7b833ff 100644
--- a/arch/powerpc/include/asm/dcr-regs.h
+++ b/arch/powerpc/include/asm/dcr-regs.h
@@ -68,6 +68,13 @@
 #define SDR0_UART3		0x0123
 #define SDR0_CUST0		0x4000
 
+/* SDR for 405EZ */
+#define DCRN_SDR_ICINTSTAT	0x4510
+#define ICINTSTAT_ICRX	0x80000000
+#define ICINTSTAT_ICTX0	0x40000000
+#define ICINTSTAT_ICTX1 0x20000000
+#define ICINTSTAT_ICTX	0x60000000
+
 /*
  * All those DCR register addresses are offsets from the base address
  * for the SRAM0 controller (e.g. 0x20 on 440GX). The base address is
diff --git a/drivers/net/ibm_newemac/mal.c b/drivers/net/ibm_newemac/mal.c
index 10c267b..1839d3f 100644
--- a/drivers/net/ibm_newemac/mal.c
+++ b/drivers/net/ibm_newemac/mal.c
@@ -28,6 +28,7 @@
 #include <linux/delay.h>
 
 #include "core.h"
+#include <asm/dcr-regs.h>
 
 static int mal_count;
 
@@ -279,6 +280,10 @@ static irqreturn_t mal_txeob(int irq, void *dev_instance)
 	mal_schedule_poll(mal);
 	set_mal_dcrn(mal, MAL_TXEOBISR, r);
 
+	if (mal_has_feature(mal, MAL_FTR_CLEAR_ICINTSTAT))
+		mtdcri(SDR0, DCRN_SDR_ICINTSTAT,
+				(mfdcri(SDR0, DCRN_SDR_ICINTSTAT) | ICINTSTAT_ICTX));
+
 	return IRQ_HANDLED;
 }
 
@@ -293,6 +298,10 @@ static irqreturn_t mal_rxeob(int irq, void *dev_instance)
 	mal_schedule_poll(mal);
 	set_mal_dcrn(mal, MAL_RXEOBISR, r);
 
+	if (mal_has_feature(mal, MAL_FTR_CLEAR_ICINTSTAT))
+		mtdcri(SDR0, DCRN_SDR_ICINTSTAT,
+				(mfdcri(SDR0, DCRN_SDR_ICINTSTAT) | ICINTSTAT_ICRX));
+
 	return IRQ_HANDLED;
 }
 
@@ -336,6 +345,25 @@ static irqreturn_t mal_rxde(int irq, void *dev_instance)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t mal_int(int irq, void *dev_instance)
+{
+	struct mal_instance *mal = dev_instance;
+	u32 esr = get_mal_dcrn(mal, MAL_ESR);
+
+	if (esr & MAL_ESR_EVB) {
+		/* descriptor error */
+		if (esr & MAL_ESR_DE) {
+			if (esr & MAL_ESR_CIDT)
+				return mal_rxde(irq, dev_instance);
+			else
+				return mal_txde(irq, dev_instance);
+		} else { /* SERR */
+			return mal_serr(irq, dev_instance);
+		}
+	}
+	return IRQ_HANDLED;
+}
+
 void mal_poll_disable(struct mal_instance *mal, struct mal_commac *commac)
 {
 	/* Spinlock-type semantics: only one caller disable poll at a time */
@@ -493,6 +521,8 @@ static int __devinit mal_probe(struct of_device *ofdev,
 	unsigned int dcr_base;
 	const u32 *prop;
 	u32 cfg;
+	unsigned long irqflags;
+	irq_handler_t hdlr_serr, hdlr_txde, hdlr_rxde;
 
 	mal = kzalloc(sizeof(struct mal_instance), GFP_KERNEL);
 	if (!mal) {
@@ -542,11 +572,21 @@ static int __devinit mal_probe(struct of_device *ofdev,
 		goto fail;
 	}
 
+	if (of_device_is_compatible(ofdev->node, "ibm,mcmal-405ez"))
+		mal->features |= (MAL_FTR_CLEAR_ICINTSTAT |
+				MAL_FTR_COMMON_ERR_INT);
+
 	mal->txeob_irq = irq_of_parse_and_map(ofdev->node, 0);
 	mal->rxeob_irq = irq_of_parse_and_map(ofdev->node, 1);
 	mal->serr_irq = irq_of_parse_and_map(ofdev->node, 2);
-	mal->txde_irq = irq_of_parse_and_map(ofdev->node, 3);
-	mal->rxde_irq = irq_of_parse_and_map(ofdev->node, 4);
+
+	if (mal_has_feature(mal, MAL_FTR_COMMON_ERR_INT)) {
+		mal->txde_irq = mal->rxde_irq = mal->serr_irq;
+	} else {
+		mal->txde_irq = irq_of_parse_and_map(ofdev->node, 3);
+		mal->rxde_irq = irq_of_parse_and_map(ofdev->node, 4);
+	}
+
 	if (mal->txeob_irq == NO_IRQ || mal->rxeob_irq == NO_IRQ ||
 	    mal->serr_irq == NO_IRQ || mal->txde_irq == NO_IRQ ||
 	    mal->rxde_irq == NO_IRQ) {
@@ -608,16 +648,26 @@ static int __devinit mal_probe(struct of_device *ofdev,
 			     sizeof(struct mal_descriptor) *
 			     mal_rx_bd_offset(mal, i));
 
-	err = request_irq(mal->serr_irq, mal_serr, 0, "MAL SERR", mal);
+	if (mal_has_feature(mal, MAL_FTR_COMMON_ERR_INT)) {
+		irqflags = IRQF_SHARED;
+		hdlr_serr = hdlr_txde = hdlr_rxde = mal_int;
+	} else {
+		irqflags = 0;
+		hdlr_serr = mal_serr;
+		hdlr_txde = mal_txde;
+		hdlr_rxde = mal_rxde;
+	}
+
+	err = request_irq(mal->serr_irq, hdlr_serr, irqflags, "MAL SERR", mal);
 	if (err)
 		goto fail2;
-	err = request_irq(mal->txde_irq, mal_txde, 0, "MAL TX DE", mal);
+	err = request_irq(mal->txde_irq, hdlr_txde, irqflags, "MAL TX DE", mal);
 	if (err)
 		goto fail3;
 	err = request_irq(mal->txeob_irq, mal_txeob, 0, "MAL TX EOB", mal);
 	if (err)
 		goto fail4;
-	err = request_irq(mal->rxde_irq, mal_rxde, 0, "MAL RX DE", mal);
+	err = request_irq(mal->rxde_irq, hdlr_rxde, irqflags, "MAL RX DE", mal);
 	if (err)
 		goto fail5;
 	err = request_irq(mal->rxeob_irq, mal_rxeob, 0, "MAL RX EOB", mal);
-- 
1.5.5.1

[PATCH 0/3 v2] ibm_newemac: Various fixes and additions for PPC405EZ

[Josh Boyer]

The following patch series adds things needed to support the PowerPC 405EZ
SoC.  I've incorporated the suggestions and fixes from the previous round
of patches and barring any further comments these should be ready to go.

josh

Josh Boyer (3):
  ibm_newemac: Allow the "no flow control" EMAC feature to work
  ibm_newemac: Introduce mal_has_feature
  ibm_newemac: MAL support for PowerPC 405EZ

 arch/powerpc/include/asm/dcr-regs.h |    7 ++++
 drivers/net/ibm_newemac/Kconfig     |   12 +++++++
 drivers/net/ibm_newemac/core.c      |    2 +
 drivers/net/ibm_newemac/core.h      |    3 ++
 drivers/net/ibm_newemac/mal.c       |   60 ++++++++++++++++++++++++++++++++---
 drivers/net/ibm_newemac/mal.h       |   34 ++++++++++++++++++++
 6 files changed, 113 insertions(+), 5 deletions(-)

Re: [PATCH 0/3 v2] ibm_newemac: Various fixes and additions for PPC405EZ

[Benjamin Herrenschmidt]

On Mon, 2008-09-08 at 08:44 -0400, Josh Boyer wrote:
> The following patch series adds things needed to support the PowerPC 405EZ
> SoC.  I've incorporated the suggestions and fixes from the previous round
> of patches and barring any further comments these should be ready to go.

For some reason, I got this email but not the 3 following patch ones...

Cheers,
Ben.

> josh
> 
> Josh Boyer (3):
>   ibm_newemac: Allow the "no flow control" EMAC feature to work
>   ibm_newemac: Introduce mal_has_feature
>   ibm_newemac: MAL support for PowerPC 405EZ
> 
>  arch/powerpc/include/asm/dcr-regs.h |    7 ++++
>  drivers/net/ibm_newemac/Kconfig     |   12 +++++++
>  drivers/net/ibm_newemac/core.c      |    2 +
>  drivers/net/ibm_newemac/core.h      |    3 ++
>  drivers/net/ibm_newemac/mal.c       |   60 ++++++++++++++++++++++++++++++++---
>  drivers/net/ibm_newemac/mal.h       |   34 ++++++++++++++++++++
>  6 files changed, 113 insertions(+), 5 deletions(-)

Re: [PATCH 0/3 v2] ibm_newemac: Various fixes and additions for PPC405EZ

[Josh Boyer]

On Tue, 09 Sep 2008 17:11:23 +1000
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> On Mon, 2008-09-08 at 08:44 -0400, Josh Boyer wrote:
> > The following patch series adds things needed to support the PowerPC 405EZ
> > SoC.  I've incorporated the suggestions and fixes from the previous round
> > of patches and barring any further comments these should be ready to go.
> 
> For some reason, I got this email but not the 3 following patch ones...

Erm.. odd.

http://patchwork.ozlabs.org/patch/208/
http://patchwork.ozlabs.org/patch/209/
http://patchwork.ozlabs.org/patch/210/

All of them were addressed to you and netdev, with linuxppc-dev on CC.
You should have gotten them..

josh

Re: [PATCH 0/3 v2] ibm_newemac: Various fixes and additions for PPC405EZ

[Josh Boyer]

On Mon, 8 Sep 2008 08:44:59 -0400
Josh Boyer <jwboyer@linux.vnet.ibm.com> wrote:

> The following patch series adds things needed to support the PowerPC 405EZ
> SoC.  I've incorporated the suggestions and fixes from the previous round
> of patches and barring any further comments these should be ready to go.
> 
> josh
> 
> Josh Boyer (3):
>   ibm_newemac: Allow the "no flow control" EMAC feature to work
>   ibm_newemac: Introduce mal_has_feature
>   ibm_newemac: MAL support for PowerPC 405EZ

I should mention that I have a platform support patch series that
depends on these for working ethernet.  I can bring this set in through
my tree at the same time if the patches look fine and Jeff acks that.

josh

Re: [PATCH 1/3] ibm_newemac: Allow the "no flow control" EMAC feature to work

[Jeff Garzik]

Josh Boyer wrote:
> Some PowerPC 40x chips have errata that force us not to use the integrated
> flow control.  We have the feature defined, but it currently can't be used
> because it is never added to EMAC_FTRS_POSSIBLE.
> 
> This adds a Kconfig option for affected platforms to select and puts the
> feature in the EMAC_FTRS_POSSIBLE list.  This is set for PowerPC 405EZ
> platforms as well.
> 
> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
> ---
>  drivers/net/ibm_newemac/Kconfig |    4 ++++
>  drivers/net/ibm_newemac/core.c  |    2 ++
>  drivers/net/ibm_newemac/core.h  |    3 +++
>  3 files changed, 9 insertions(+), 0 deletions(-)

ACK patches 1-3