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From 2f9f0ec1ff013934a86a7303c9194f6dc05620c3 Mon Sep 17 00:00:00 2001
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From: Sebastian Mayr <sebastian.mayr@student.uibk.ac.at>
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Date: Thu, 20 Dec 2012 18:34:45 +0100
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Subject: [PATCH 1/2] lantiq_etop: Change MDIO clock
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This patch sets the MDC clock to 2.5MHz which fixes the MDIO communication
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with the ar8316 switch.
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---
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drivers/net/ethernet/lantiq_etop.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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--- a/drivers/net/ethernet/lantiq_etop.c
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+++ b/drivers/net/ethernet/lantiq_etop.c
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@@ -83,6 +83,7 @@
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#define LTQ_GBIT_PMAC_HD_CTL 0x8c
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#define LTQ_GBIT_P0_CTL 0x4
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#define LTQ_GBIT_PMAC_RX_IPG 0xa8
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+#define LTQ_GBIT_RGMII_CTL 0x78
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#define PMAC_HD_CTL_AS (1 << 19)
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#define PMAC_HD_CTL_RXSH (1 << 22)
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@@ -92,6 +93,10 @@
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/* Disable MDIO auto polling (0=disable, 1=enable) */
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#define PX_CTL_DMDIO 0x00400000
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+/* MDC clock divider, clock = 25MHz/((MDC_CLOCK + 1) * 2) */
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+#define MDC_CLOCK_MASK 0xff000000
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+#define MDC_CLOCK_OFFSET 24
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+
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/* register information for the gbit's MDIO bus */
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#define MDIO_XR9_REQUEST 0x00008000
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#define MDIO_XR9_READ 0x00000800
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@@ -329,6 +334,9 @@ ltq_etop_gbit_init(struct net_device *de
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/* Due to traffic halt when burst length 8,
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replace default IPG value with 0x3B */
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ltq_gbit_w32(0x3B, LTQ_GBIT_PMAC_RX_IPG);
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+ /* set mdc clock to 2.5 MHz */
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+ ltq_gbit_w32_mask(MDC_CLOCK_MASK, 4 << MDC_CLOCK_OFFSET,
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+ LTQ_GBIT_RGMII_CTL);
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}
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static int
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