[U-Boot] [PATCH v3 1/3] davinci: emac: add new features to autonegotiate for EMAC

[manjunath.hadli]

From: Manjunath Hadli <manjunath.ha...@ti.com>

add more features like DUPLEX, 100MB link speed etc to auto negotiate
in EMAC driver. EMAC controller autonegotiates for these features with
PHYs which are on the board.

Signed-off-by: Sudhakar Rajashekhara <sudhakar....@ti.com>
Signed-off-by: Manjunath Hadli <manjunath.ha...@ti.com>
---
 drivers/net/davinci_emac.c |   30 ++++++++++++++++++++++++++++--
 1 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index a8905b8..52617a7 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -279,16 +279,42 @@ static int gen_get_link_speed(int phy_addr)
 static int gen_auto_negotiate(int phy_addr)
 {
        u_int16_t       tmp;
+       u_int16_t       val;
+       unsigned long   cntr = 0;
+
+       if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
+               return 0;
+
+       val = tmp | BMCR_FULLDPLX | BMCR_ANENABLE |
+                                               BMCR_SPEED100;
+       davinci_eth_phy_write(phy_addr, MII_BMCR, val);
+
+       if (!davinci_eth_phy_read(phy_addr, MII_ADVERTISE, &val))
+               return 0;
+
+       val |= (ADVERTISE_100FULL | ADVERTISE_100HALF | ADVERTISE_10FULL |
+                                                       ADVERTISE_10HALF);
+       davinci_eth_phy_write(phy_addr, MII_ADVERTISE, val);
 
        if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
                return(0);
 
        /* Restart Auto_negotiation  */
-       tmp |= BMCR_ANENABLE;
+       tmp |= BMCR_ANRESTART;
        davinci_eth_phy_write(phy_addr, MII_BMCR, tmp);
 
        /*check AutoNegotiate complete */
-       udelay (10000);
+       do {
+               udelay(40000);
+               if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
+                       return 0;
+
+               if (tmp & BMSR_ANEGCOMPLETE)
+                       break;
+
+               cntr++;
+       } while (cntr < 200);
+
        if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
                return(0);
 
-- 
1.6.2.4

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