diff mbox

net: fec: don't access RACC register when not available

Message ID 201506260510.t5Q5AZ90010455@goober.accelecon.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Greg Ungerer June 26, 2015, 5:10 a.m. UTC 
From 8969de63989b8814a6db9d00b9d1ceabe40e8b11 Mon Sep 17 00:00:00 2001
From: Greg Ungerer <gerg@uclinux.org>
Date: Sat, 20 Jun 2015 15:51:57 +1000
Subject: [PATCH] net: fec: don't access RACC register when not available

Not all silicon implementations of the Freescale FEC hardware module
have the RACC (Receive Accelerator Function) register, so we should not
be trying to access it on those that don't. Currently none of the ColdFire
based parts with a FEC have it.

Support for RACC was introduced by commit 4c09eed9 ("net: fec: Enable imx6
enet checksum acceleration"). A fix was introduced in commit d1391930
("net: fec: Fix build for MCF5272") that disables its use on the ColdFire
M5272 part, but it doesn't fix the general case of other ColdFire parts.

To fix we create a quirk flag, FEC_QUIRK_HAS_RACC, and check it before
working with the RACC register.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
---
 drivers/net/ethernet/freescale/fec.h      |  2 ++
 drivers/net/ethernet/freescale/fec_main.c | 30 +++++++++++++++++-------------
 2 files changed, 19 insertions(+), 13 deletions(-)

Comments

David Miller June 29, 2015, 12:02 a.m. UTC | #1 
From: Greg Ungerer <gerg@uclinux.org>
Date: Fri, 26 Jun 2015 15:10:35 +1000

> From 8969de63989b8814a6db9d00b9d1ceabe40e8b11 Mon Sep 17 00:00:00 2001
> From: Greg Ungerer <gerg@uclinux.org>
> Date: Sat, 20 Jun 2015 15:51:57 +1000
> Subject: [PATCH] net: fec: don't access RACC register when not available
> 
> Not all silicon implementations of the Freescale FEC hardware module
> have the RACC (Receive Accelerator Function) register, so we should not
> be trying to access it on those that don't. Currently none of the ColdFire
> based parts with a FEC have it.
> 
> Support for RACC was introduced by commit 4c09eed9 ("net: fec: Enable imx6
> enet checksum acceleration"). A fix was introduced in commit d1391930
> ("net: fec: Fix build for MCF5272") that disables its use on the ColdFire
> M5272 part, but it doesn't fix the general case of other ColdFire parts.
> 
> To fix we create a quirk flag, FEC_QUIRK_HAS_RACC, and check it before
> working with the RACC register.
> 
> Signed-off-by: Greg Ungerer <gerg@uclinux.org>

Applied, thank you.
--
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
diff mbox

Patch

diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index a86af8a..1eee73c 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -428,6 +428,8 @@  struct bufdesc_ex {
 #define FEC_QUIRK_BUG_CAPTURE		(1 << 10)
 /* Controller has only one MDIO bus */
 #define FEC_QUIRK_SINGLE_MDIO		(1 << 11)
+/* Controller supports RACC register */
+#define FEC_QUIRK_HAS_RACC		(1 << 12)
 
 struct fec_enet_priv_tx_q {
 	int index;
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 66d47e4..63658d5 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -85,28 +85,30 @@  static struct platform_device_id fec_devtype[] = {
 		.driver_data = 0,
 	}, {
 		.name = "imx25-fec",
-		.driver_data = FEC_QUIRK_USE_GASKET,
+		.driver_data = FEC_QUIRK_USE_GASKET | FEC_QUIRK_HAS_RACC,
 	}, {
 		.name = "imx27-fec",
-		.driver_data = 0,
+		.driver_data = FEC_QUIRK_HAS_RACC,
 	}, {
 		.name = "imx28-fec",
 		.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_SWAP_FRAME |
-				FEC_QUIRK_SINGLE_MDIO,
+				FEC_QUIRK_SINGLE_MDIO | FEC_QUIRK_HAS_RACC,
 	}, {
 		.name = "imx6q-fec",
 		.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT |
 				FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM |
-				FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR006358,
+				FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR006358 |
+				FEC_QUIRK_HAS_RACC,
 	}, {
 		.name = "mvf600-fec",
-		.driver_data = FEC_QUIRK_ENET_MAC,
+		.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_RACC,
 	}, {
 		.name = "imx6sx-fec",
 		.driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT |
 				FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM |
 				FEC_QUIRK_HAS_VLAN | FEC_QUIRK_HAS_AVB |
-				FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE,
+				FEC_QUIRK_ERR007885 | FEC_QUIRK_BUG_CAPTURE |
+				FEC_QUIRK_HAS_RACC,
 	}, {
 		/* sentinel */
 	}
@@ -970,13 +972,15 @@  fec_restart(struct net_device *ndev)
 	writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
 
 #if !defined(CONFIG_M5272)
-	/* set RX checksum */
-	val = readl(fep->hwp + FEC_RACC);
-	if (fep->csum_flags & FLAG_RX_CSUM_ENABLED)
-		val |= FEC_RACC_OPTIONS;
-	else
-		val &= ~FEC_RACC_OPTIONS;
-	writel(val, fep->hwp + FEC_RACC);
+	if (fep->quirks & FEC_QUIRK_HAS_RACC) {
+		/* set RX checksum */
+		val = readl(fep->hwp + FEC_RACC);
+		if (fep->csum_flags & FLAG_RX_CSUM_ENABLED)
+			val |= FEC_RACC_OPTIONS;
+		else
+			val &= ~FEC_RACC_OPTIONS;
+		writel(val, fep->hwp + FEC_RACC);
+	}
 #endif
 
 	/*