Add support for Cogent csb637

Patch by Anders Larsen, 29 Apr 2005

1 files changed, 232 insertions, 0 deletions

diff --git a/cpu/arm920t/at91rm9200/bcm5221.c b/cpu/arm920t/at91rm9200/bcm5221.c
new file mode 100644
index 0000000..6db1435
--- /dev/null
+++ b/cpu/arm920t/at91rm9200/bcm5221.c
@@ -0,0 +1,232 @@
+/*
+ * Broadcom BCM5221 Ethernet PHY
+ *
+ * (C) Copyright 2005 REA Elektronik GmbH <www.rea.de>
+ * Anders Larsen <alarsen@rea.de>
+ *
+ * (C) Copyright 2003
+ * Author : Hamid Ikdoumi (Atmel)
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <at91rm9200_net.h>
+#include <net.h>
+#include <bcm5221.h>
+
+#ifdef CONFIG_DRIVER_ETHER
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET)
+
+/*
+ * Name:
+ *	bcm5221_IsPhyConnected
+ * Description:
+ *	Reads the 2 PHY ID registers
+ * Arguments:
+ *	p_mac - pointer to AT91S_EMAC struct
+ * Return value:
+ *	TRUE - if id read successfully
+ *	FALSE- if error
+ */
+unsigned int bcm5221_IsPhyConnected (AT91PS_EMAC p_mac)
+{
+	unsigned short Id1, Id2;
+
+	at91rm9200_EmacEnableMDIO (p_mac);
+	at91rm9200_EmacReadPhy (p_mac, BCM5221_PHYID1, &Id1);
+	at91rm9200_EmacReadPhy (p_mac, BCM5221_PHYID2, &Id2);
+	at91rm9200_EmacDisableMDIO (p_mac);
+
+	if ((Id1 == (BCM5221_PHYID1_OUI >> 6)) &&
+		((Id2 >> 10) == (BCM5221_PHYID1_OUI & BCM5221_LSB_MASK)))
+		return TRUE;
+
+	return FALSE;
+}
+
+/*
+ * Name:
+ *	bcm5221_GetLinkSpeed
+ * Description:
+ *	Link parallel detection status of MAC is checked and set in the
+ *	MAC configuration registers
+ * Arguments:
+ *	p_mac - pointer to MAC
+ * Return value:
+ *	TRUE - if link status set succesfully
+ *	FALSE - if link status not set
+ */
+unsigned char bcm5221_GetLinkSpeed (AT91PS_EMAC p_mac)
+{
+	unsigned short stat1, stat2;
+
+	if (!at91rm9200_EmacReadPhy (p_mac, BCM5221_BMSR, &stat1))
+		return FALSE;
+
+	if (!(stat1 & BCM5221_LINK_STATUS))	/* link status up? */
+		return FALSE;
+
+	if (!at91rm9200_EmacReadPhy (p_mac, BCM5221_ACSR, &stat2))
+		return FALSE;
+
+	if ((stat1 & BCM5221_100BASE_TX_FD) && (stat2 & BCM5221_100) && (stat2 & BCM5221_FDX)) {
+		/*set Emac for 100BaseTX and Full Duplex  */
+		p_mac->EMAC_CFG |= AT91C_EMAC_SPD | AT91C_EMAC_FD;
+		return TRUE;
+	}
+
+	if ((stat1 & BCM5221_10BASE_T_FD) && !(stat2 & BCM5221_100) && (stat2 & BCM5221_FDX)) {
+		/*set MII for 10BaseT and Full Duplex  */
+		p_mac->EMAC_CFG = (p_mac->EMAC_CFG &
+				~(AT91C_EMAC_SPD | AT91C_EMAC_FD))
+				| AT91C_EMAC_FD;
+		return TRUE;
+	}
+
+	if ((stat1 & BCM5221_100BASE_TX_HD) && (stat2 & BCM5221_100) && !(stat2 & BCM5221_FDX)) {
+		/*set MII for 100BaseTX and Half Duplex  */
+		p_mac->EMAC_CFG = (p_mac->EMAC_CFG &
+				~(AT91C_EMAC_SPD | AT91C_EMAC_FD))
+				| AT91C_EMAC_SPD;
+		return TRUE;
+	}
+
+	if ((stat1 & BCM5221_10BASE_T_HD) && !(stat2 & BCM5221_100) && !(stat2 & BCM5221_FDX)) {
+		/*set MII for 10BaseT and Half Duplex  */
+		p_mac->EMAC_CFG &= ~(AT91C_EMAC_SPD | AT91C_EMAC_FD);
+		return TRUE;
+	}
+	return FALSE;
+}
+
+
+/*
+ * Name:
+ *	bcm5221_InitPhy
+ * Description:
+ *	MAC starts checking its link by using parallel detection and
+ *	Autonegotiation and the same is set in the MAC configuration registers
+ * Arguments:
+ *	p_mac - pointer to struct AT91S_EMAC
+ * Return value:
+ *	TRUE - if link status set succesfully
+ *	FALSE - if link status not set
+ */
+unsigned char bcm5221_InitPhy (AT91PS_EMAC p_mac)
+{
+	unsigned char ret = TRUE;
+	unsigned short IntValue;
+
+	at91rm9200_EmacEnableMDIO (p_mac);
+
+	if (!bcm5221_GetLinkSpeed (p_mac)) {
+		/* Try another time */
+		ret = bcm5221_GetLinkSpeed (p_mac);
+	}
+
+	/* Disable PHY Interrupts */
+	at91rm9200_EmacReadPhy (p_mac, BCM5221_INTR, &IntValue);
+	/* clear FDX LED and INTR Enable */
+	IntValue &= ~(BCM5221_FDX_LED | BCM5221_INTR_ENABLE);
+	/* set FDX, SPD, Link, INTR masks */
+	IntValue |= (BCM5221_FDX_MASK  | BCM5221_SPD_MASK |
+		     BCM5221_LINK_MASK | BCM5221_INTR_MASK);
+	at91rm9200_EmacWritePhy (p_mac, BCM5221_INTR, &IntValue);
+	at91rm9200_EmacDisableMDIO (p_mac);
+
+	return (ret);
+}
+
+
+/*
+ * Name:
+ *	bcm5221_AutoNegotiate
+ * Description:
+ *	MAC Autonegotiates with the partner status of same is set in the
+ *	MAC configuration registers
+ * Arguments:
+ *	dev - pointer to struct net_device
+ * Return value:
+ *	TRUE - if link status set successfully
+ *	FALSE - if link status not set
+ */
+unsigned char bcm5221_AutoNegotiate (AT91PS_EMAC p_mac, int *status)
+{
+	unsigned short value;
+	unsigned short PhyAnar;
+	unsigned short PhyAnalpar;
+
+	/* Set bcm5221 control register */
+	if (!at91rm9200_EmacReadPhy (p_mac, BCM5221_BMCR, &value))
+		return FALSE;
+	value &= ~BCM5221_AUTONEG;	/* remove autonegotiation enable */
+	value |=  BCM5221_ISOLATE;	/* Electrically isolate PHY */
+	if (!at91rm9200_EmacWritePhy (p_mac, BCM5221_BMCR, &value))
+		return FALSE;
+
+	/* Set the Auto_negotiation Advertisement Register */
+	/* MII advertising for 100BaseTxFD and HD, 10BaseTFD and HD, IEEE 802.3 */
+	PhyAnar = BCM5221_TX_FDX | BCM5221_TX_HDX |
+		  BCM5221_10_FDX | BCM5221_10_HDX | BCM5221_AN_IEEE_802_3;
+	if (!at91rm9200_EmacWritePhy (p_mac, BCM5221_ANAR, &PhyAnar))
+		return FALSE;
+
+	/* Read the Control Register     */
+	if (!at91rm9200_EmacReadPhy (p_mac, BCM5221_BMCR, &value))
+		return FALSE;
+
+	value |= BCM5221_SPEED_SELECT | BCM5221_AUTONEG | BCM5221_DUPLEX_MODE;
+	if (!at91rm9200_EmacWritePhy (p_mac, BCM5221_BMCR, &value))
+		return FALSE;
+	/* Restart Auto_negotiation  */
+	value |= BCM5221_RESTART_AUTONEG;
+	value &= ~BCM5221_ISOLATE;
+	if (!at91rm9200_EmacWritePhy (p_mac, BCM5221_BMCR, &value))
+		return FALSE;
+
+	/*check AutoNegotiate complete */
+	udelay (10000);
+	at91rm9200_EmacReadPhy (p_mac, BCM5221_BMSR, &value);
+	if (!(value & BCM5221_AUTONEG_COMP))
+		return FALSE;
+
+	/* Get the AutoNeg Link partner base page */
+	if (!at91rm9200_EmacReadPhy (p_mac, BCM5221_ANLPAR, &PhyAnalpar))
+		return FALSE;
+
+	if ((PhyAnar & BCM5221_TX_FDX) && (PhyAnalpar & BCM5221_TX_FDX)) {
+		/*set MII for 100BaseTX and Full Duplex  */
+		p_mac->EMAC_CFG |= AT91C_EMAC_SPD | AT91C_EMAC_FD;
+		return TRUE;
+	}
+
+	if ((PhyAnar & BCM5221_10_FDX) && (PhyAnalpar & BCM5221_10_FDX)) {
+		/*set MII for 10BaseT and Full Duplex  */
+		p_mac->EMAC_CFG = (p_mac->EMAC_CFG &
+				~(AT91C_EMAC_SPD | AT91C_EMAC_FD))
+				| AT91C_EMAC_FD;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+#endif	/* CONFIG_COMMANDS & CFG_CMD_NET */
+
+#endif	/* CONFIG_DRIVER_ETHER */