[PATCH v3] net: fec: Fix build for MCF5272

[Guenter Roeck <linux@roeck-us.net>]

Commits 4c09eed9 (net: fec: Enable imx6 enet checksum acceleration) and
baa70a5c (net: fec: enable pause frame to improve rx prefomance for 1G
network) introduced functionality into the FEC driver which is not
supported on MCF5272. The registers used to implement this functionality
do not exist on MCF5272. Since register defines for MCF5272 are separate
from register defines for other chips, building images for MCF5272 fails
as follows.

fec_main.c: In function 'fec_restart':
fec_main.c:520:8: error: 'FEC_RACC' undeclared (first use in this function)
fec_main.c:585:3: error: 'FEC_R_FIFO_RSEM' undeclared (first use in this function)
fec_main.c:586:3: error: 'FEC_R_FIFO_RSFL' undeclared (first use in this function)
fec_main.c:587:3: error: 'FEC_R_FIFO_RAEM' undeclared (first use in this function)
fec_main.c:588:3: error: 'FEC_R_FIFO_RAFL' undeclared (first use in this function)
fec_main.c:591:3: error: 'FEC_OPD' undeclared (first use in this function)

Adding the missing register defines is not an option, since the registers
do not exist on MCF5272. Disable the added functionality for MCF5272 builds.

Cc: Frank Li <Frank.Li@freescale.com>
Cc: Jim Baxter <jim_baxter@mentor.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
v3: Add build error to commit log
v2: Improved explanation to clarify that the build fails due to missing register
    defines which can not be added since the registers don't exist on MCF5272. 

This problem exists in 3.9 as well, though only due to commit baa70a5c. The
patch does therefore not cleanly apply to 3.9. Options I can see are to ignore
the build error in 3.9, to back-port the patch manually, or to split it into
two separate patches. David, let me know which approach you prefer. 

 drivers/net/ethernet/freescale/fec_main.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index a667015..d48099f 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -516,6 +516,7 @@ fec_restart(struct net_device *ndev, int duplex)
 	/* Set MII speed */
 	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)
@@ -523,6 +524,7 @@ fec_restart(struct net_device *ndev, int duplex)
 	else
 		val &= ~FEC_RACC_OPTIONS;
 	writel(val, fep->hwp + FEC_RACC);
+#endif
 
 	/*
 	 * The phy interface and speed need to get configured
@@ -575,6 +577,7 @@ fec_restart(struct net_device *ndev, int duplex)
 #endif
 	}
 
+#if !defined(CONFIG_M5272)
 	/* enable pause frame*/
 	if ((fep->pause_flag & FEC_PAUSE_FLAG_ENABLE) ||
 	    ((fep->pause_flag & FEC_PAUSE_FLAG_AUTONEG) &&
@@ -592,6 +595,7 @@ fec_restart(struct net_device *ndev, int duplex)
 	} else {
 		rcntl &= ~FEC_ENET_FCE;
 	}
+#endif /* !defined(CONFIG_M5272) */
 
 	writel(rcntl, fep->hwp + FEC_R_CNTRL);
 
@@ -1205,7 +1209,9 @@ static int fec_enet_mii_probe(struct net_device *ndev)
 	/* mask with MAC supported features */
 	if (id_entry->driver_data & FEC_QUIRK_HAS_GBIT) {
 		phy_dev->supported &= PHY_GBIT_FEATURES;
+#if !defined(CONFIG_M5272)
 		phy_dev->supported |= SUPPORTED_Pause;
+#endif
 	}
 	else
 		phy_dev->supported &= PHY_BASIC_FEATURES;
@@ -1390,6 +1396,8 @@ static int fec_enet_get_ts_info(struct net_device *ndev,
 	}
 }
 
+#if !defined(CONFIG_M5272)
+
 static void fec_enet_get_pauseparam(struct net_device *ndev,
 				    struct ethtool_pauseparam *pause)
 {
@@ -1436,9 +1444,13 @@ static int fec_enet_set_pauseparam(struct net_device *ndev,
 	return 0;
 }
 
+#endif /* !defined(CONFIG_M5272) */
+
 static const struct ethtool_ops fec_enet_ethtool_ops = {
+#if !defined(CONFIG_M5272)
 	.get_pauseparam		= fec_enet_get_pauseparam,
 	.set_pauseparam		= fec_enet_set_pauseparam,
+#endif
 	.get_settings		= fec_enet_get_settings,
 	.set_settings		= fec_enet_set_settings,
 	.get_drvinfo		= fec_enet_get_drvinfo,
@@ -1874,10 +1886,12 @@ fec_probe(struct platform_device *pdev)
 	/* setup board info structure */
 	fep = netdev_priv(ndev);
 
+#if !defined(CONFIG_M5272)
 	/* default enable pause frame auto negotiation */
 	if (pdev->id_entry &&
 	    (pdev->id_entry->driver_data & FEC_QUIRK_HAS_GBIT))
 		fep->pause_flag |= FEC_PAUSE_FLAG_AUTONEG;
+#endif
 
 	fep->hwp = devm_request_and_ioremap(&pdev->dev, r);
 	fep->pdev = pdev;
-- 
1.7.9.7