From ba83a3076523be79e85fd07433f8b3f361e6428b Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Mon, 4 Apr 2005 12:23:03 +0000
Subject: Patch by Steven Scholz, 04 Apr 2005: Make sure that MDIO clock does
 not exceed 2.5 MHz on AT91

---
 cpu/at91rm9200/at91rm9200_ether.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'cpu')

diff --git a/cpu/at91rm9200/at91rm9200_ether.c b/cpu/at91rm9200/at91rm9200_ether.c
index 2ec888f..0bc1d89 100644
--- a/cpu/at91rm9200/at91rm9200_ether.c
+++ b/cpu/at91rm9200/at91rm9200_ether.c
@@ -210,6 +210,11 @@ int eth_init (bd_t * bd)
 	p_mac->EMAC_CFG |= AT91C_EMAC_RMII;
 #endif
 
+#if (AT91C_MASTER_CLOCK > 40000000)
+	/* MDIO clock must not exceed 2.5 MHz, so enable MCK divider */
+	p_mac->EMAC_CFG |= AT91C_EMAC_CLK_HCLK_64;
+#endif
+
 	p_mac->EMAC_CTL |= AT91C_EMAC_TE | AT91C_EMAC_RE;
 
 	at91rm92000_GetPhyInterface (& PhyOps);
-- 
cgit v1.1