From: "Eric Bénard" <eric@eukrea.com>
To: netdev@vger.kernel.org
Cc: shawn.guo@linaro.org, davem@davemloft.net,
linux-arm-kernel@lists.infradead.org,
u.kleine-koenig@pengutronix.de
Subject: [PATCH] net: fsl: fec: handle 10Mbps speed in RMII mode
Date: Wed, 11 Jan 2012 17:29:36 +0100 [thread overview]
Message-ID: <1326299376-22853-1-git-send-email-eric@eukrea.com> (raw)
when the link is 10 Mbps and the mode is RMII, it's necessary
to set FRCONT to 1 in MIIGSK_CFGR to divide the RMII source
clock by 10 in order to support 10 Mbps operations.
Signed-off-by: Eric Bénard <eric@eukrea.com>
---
drivers/net/ethernet/freescale/fec.c | 10 ++++++++--
drivers/net/ethernet/freescale/fec.h | 4 ++++
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
index ddcbbb3..89532ab 100644
--- a/drivers/net/ethernet/freescale/fec.c
+++ b/drivers/net/ethernet/freescale/fec.c
@@ -476,6 +476,7 @@ fec_restart(struct net_device *ndev, int duplex)
} else {
#ifdef FEC_MIIGSK_ENR
if (id_entry->driver_data & FEC_QUIRK_USE_GASKET) {
+ u32 miigsk;
/* disable the gasket and wait */
writel(0, fep->hwp + FEC_MIIGSK_ENR);
while (readl(fep->hwp + FEC_MIIGSK_ENR) & 4)
@@ -486,8 +487,13 @@ fec_restart(struct net_device *ndev, int duplex)
* RMII, 50 MHz, no loopback, no echo
* MII, 25 MHz, no loopback, no echo
*/
- writel((fep->phy_interface == PHY_INTERFACE_MODE_RMII) ?
- 1 : 0, fep->hwp + FEC_MIIGSK_CFGR);
+ miigsk = (fep->phy_interface == PHY_INTERFACE_MODE_RMII)
+ ? FEC_MIIGSK_RMII_MODE : FEC_MIIGSK_MII_MODE;
+ if (fep->phy_dev) {
+ if (fep->phy_dev->speed == SPEED_10)
+ miigsk |= FEC_MIIGSK_FRCONT_10M;
+ }
+ writel(miigsk, fep->hwp + FEC_MIIGSK_CFGR);
/* re-enable the gasket */
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index 8b2c6d7..6870d9e 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -47,6 +47,10 @@
#define FEC_MIIGSK_CFGR 0x300 /* MIIGSK Configuration reg */
#define FEC_MIIGSK_ENR 0x308 /* MIIGSK Enable reg */
+#define FEC_MIIGSK_MII_MODE 0x00
+#define FEC_MIIGSK_RMII_MODE 0x01
+#define FEC_MIIGSK_FRCONT_10M 0x40
+
#else
#define FEC_ECNTRL 0x000 /* Ethernet control reg */
--
1.7.7.5
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next reply other threads:[~2012-01-11 16:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-11 16:29 Eric Bénard [this message]
2012-01-12 15:27 ` [PATCH] net: fsl: fec: handle 10Mbps speed in RMII mode Shawn Guo
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