net: reduce boot latency on QE UEC based boards

actually polling for PHY autonegotiation to finish enables us to remove the
5 second boot prompt latency present on QE based boards.

call to qe_set_mii_clk_src in init_phy, and mv call to init_phy from
uec_initialize to uec_init by Joakim Tjernlund; autonegotiation wait
code shamelessly stolen from tsec driver.

also rm unused CONFIG_RMII_MODE code.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

2 files changed, 79 insertions, 48 deletions

diff --git a/drivers/qe/uec.c b/drivers/qe/uec.c
index 9094643..55f37cb 100644
--- a/drivers/qe/uec.c
+++ b/drivers/qe/uec.c
@@ -512,6 +512,8 @@ static int init_phy(struct eth_device *dev)
 
 	uec->mii_info = mii_info;
 
+	qe_set_mii_clk_src(uec->uec_info->uf_info.ucc_num);
+
 	if (init_mii_management_configuration(umii_regs)) {
 		printf("%s: The MII Bus is stuck!", dev->name);
 		err = -1;
@@ -618,21 +620,12 @@ static void adjust_link(struct eth_device *dev)
 static void phy_change(struct eth_device *dev)
 {
 	uec_private_t	*uec = (uec_private_t *)dev->priv;
-	uec_t		*uec_regs;
-	int		result = 0;
-
-	uec_regs = uec->uec_regs;
-
-	/* Delay 5s to give the PHY a chance to change the register state */
-	udelay(5000000);
 
 	/* Update the link, speed, duplex */
-	result = uec->mii_info->phyinfo->read_status(uec->mii_info);
+	uec->mii_info->phyinfo->read_status(uec->mii_info);
 
 	/* Adjust the interface according to speed */
-	if ((0 == result) || (uec->mii_info->link == 0)) {
-		adjust_link(dev);
-	}
+	adjust_link(dev);
 }
 
 static int uec_set_mac_address(uec_private_t *uec, u8 *mac_addr)
@@ -1157,27 +1150,59 @@ static int uec_startup(uec_private_t *uec)
 static int uec_init(struct eth_device* dev, bd_t *bd)
 {
 	uec_private_t		*uec;
-	int			err;
+	int			err, i;
+	struct phy_info         *curphy;
 
 	uec = (uec_private_t *)dev->priv;
 
 	if (uec->the_first_run == 0) {
-		/* Set up the MAC address */
-		if (dev->enetaddr[0] & 0x01) {
-			printf("%s: MacAddress is multcast address\n",
-				 __FUNCTION__);
-			return -1;
+		err = init_phy(dev);
+		if (err) {
+			printf("%s: Cannot initialize PHY, aborting.\n",
+			       dev->name);
+			return err;
 		}
-		uec_set_mac_address(uec, dev->enetaddr);
+
+		curphy = uec->mii_info->phyinfo;
+
+		if (curphy->config_aneg) {
+			err = curphy->config_aneg(uec->mii_info);
+			if (err) {
+				printf("%s: Can't negotiate PHY\n", dev->name);
+				return err;
+			}
+		}
+
+		/* Give PHYs up to 5 sec to report a link */
+		i = 50;
+		do {
+			err = curphy->read_status(uec->mii_info);
+			udelay(100000);
+		} while (((i-- > 0) && !uec->mii_info->link) || err);
+
+		if (err || i <= 0)
+			printf("warning: %s: timeout on PHY link\n", dev->name);
+
 		uec->the_first_run = 1;
 	}
 
+	/* Set up the MAC address */
+	if (dev->enetaddr[0] & 0x01) {
+		printf("%s: MacAddress is multcast address\n",
+			 __FUNCTION__);
+		return -1;
+	}
+	uec_set_mac_address(uec, dev->enetaddr);
+
+
 	err = uec_open(uec, COMM_DIR_RX_AND_TX);
 	if (err) {
 		printf("%s: cannot enable UEC device\n", dev->name);
 		return -1;
 	}
 
+	phy_change(dev);
+
 	return (uec->mii_info->link ? 0 : -1);
 }
 
@@ -1330,14 +1355,6 @@ int uec_initialize(int index)
 		return err;
 	}
 
-	err = init_phy(dev);
-	if (err) {
-		printf("%s: Cannot initialize PHY, aborting.\n", dev->name);
-		return err;
-	}
-
-	phy_change(dev);
-
 	return 1;
 }
 #endif /* CONFIG_QE */
diff --git a/drivers/qe/uec_phy.c b/drivers/qe/uec_phy.c
index ca6faa6..f890d4f 100644
--- a/drivers/qe/uec_phy.c
+++ b/drivers/qe/uec_phy.c
@@ -77,11 +77,10 @@ void uec_write_phy_reg (struct eth_device *dev, int mii_id, int regnum, int valu
 
 	/* Setting up the MII Mangement Control Register with the value */
 	out_be32 (&ug_regs->miimcon, (u32) value);
+	sync();
 
 	/* Wait till MII management write is complete */
 	while ((in_be32 (&ug_regs->miimind)) & MIIMIND_BUSY);
-
-	udelay (100000);
 }
 
 /* Reads from register regnum in the PHY for device dev, */
@@ -101,16 +100,17 @@ int uec_read_phy_reg (struct eth_device *dev, int mii_id, int regnum)
 	tmp_reg = ((u32) mii_id << MIIMADD_PHY_ADDRESS_SHIFT) | mii_reg;
 	out_be32 (&ug_regs->miimadd, tmp_reg);
 
-	/* Perform an MII management read cycle */
+	/* clear MII management command cycle */
 	out_be32 (&ug_regs->miimcom, 0);
+	sync();
+
+	/* Perform an MII management read cycle */
 	out_be32 (&ug_regs->miimcom, MIIMCOM_READ_CYCLE);
 
 	/* Wait till MII management write is complete */
 	while ((in_be32 (&ug_regs->miimind)) &
 	       (MIIMIND_NOT_VALID | MIIMIND_BUSY));
 
-	udelay (100000);
-
 	/* Read MII management status  */
 	value = (u16) in_be32 (&ug_regs->miimstat);
 	if (value == 0xffff)
@@ -270,20 +270,38 @@ static int genmii_update_link (struct uec_mii_info *mii_info)
 {
 	u16 status;
 
-	/* Do a fake read */
+	/* Status is read once to clear old link state */
 	phy_read (mii_info, PHY_BMSR);
 
-	/* Read link and autonegotiation status */
-	status = phy_read (mii_info, PHY_BMSR);
-	if ((status & PHY_BMSR_LS) == 0)
-		mii_info->link = 0;
-	else
+	/*
+	 * Wait if the link is up, and autonegotiation is in progress
+	 * (ie - we're capable and it's not done)
+	 */
+	status = phy_read(mii_info, PHY_BMSR);
+	if ((status & PHY_BMSR_LS) && (status & PHY_BMSR_AUTN_ABLE)
+	    && !(status & PHY_BMSR_AUTN_COMP)) {
+		int i = 0;
+
+		while (!(status & PHY_BMSR_AUTN_COMP)) {
+			/*
+			 * Timeout reached ?
+			 */
+			if (i > UGETH_AN_TIMEOUT) {
+				mii_info->link = 0;
+				return 0;
+			}
+
+			udelay(1000);	/* 1 ms */
+			status = phy_read(mii_info, PHY_BMSR);
+		}
 		mii_info->link = 1;
-
-	/* If we are autonegotiating, and not done,
-	 * return an error */
-	if (mii_info->autoneg && !(status & PHY_BMSR_AUTN_COMP))
-		return -EAGAIN;
+		udelay(500000);	/* another 500 ms (results in faster booting) */
+	} else {
+		if (status & PHY_BMSR_LS)
+			mii_info->link = 1;
+		else
+			mii_info->link = 0;
+	}
 
 	return 0;
 }
@@ -389,16 +407,12 @@ static int dm9161_init (struct uec_mii_info *mii_info)
 	/* PHY and MAC connect */
 	phy_write (mii_info, PHY_BMCR, phy_read (mii_info, PHY_BMCR) &
 		   ~PHY_BMCR_ISO);
-#ifdef CONFIG_RMII_MODE
-	phy_write (mii_info, MII_DM9161_SCR, MII_DM9161_SCR_RMII_INIT);
-#else
+
 	phy_write (mii_info, MII_DM9161_SCR, MII_DM9161_SCR_INIT);
-#endif
+
 	config_genmii_advert (mii_info);
 	/* Start/restart aneg */
 	genmii_config_aneg (mii_info);
-	/* Delay to wait the aneg compeleted */
-	udelay (3000000);
 
 	return 0;
 }