Create PHY Lib for U-Boot

Extends the mii_dev structure to participate in a full-blown MDIO and
PHY driver scheme.  The mii_dev structure and miiphy calls are modified
in such a way to allow the original mii command and miiphy
infrastructure to work as before, but also to support a new set of APIs
which allow (among other things) sharing of PHY driver code and 10G support

The mii command will continue to support normal PHY management functions
(Clause 22 of 802.3), but will not be changed to support 10G
(Clause 45).

The basic design is similar to PHY Lib from Linux, but simplified for
U-Boot's network and driver infrastructure.

We now have MDIO drivers and PHY drivers

An MDIO driver provides:
read
write
reset

A PHY driver provides:
(optionally): probe
config - initial setup, starting of auto-negotiation
startup - waiting for AN, and reading link state
shutdown - any cleanup needed

The ethernet drivers interact with the PHY Lib using these functions:
phy_connect()
phy_config()
phy_startup()
phy_shutdown()

Each PHY driver can be configured separately, or all at once using
config_phylib_all_drivers.h (added in the patch which adds the drivers)

We also provide generic drivers for Clause 22 (10/100/1000), and
Clause 45 (10G) PHYs.

We also implement phy_reset(), and call it in phy_connect(). Because
phy_reset() is essentially the same as miiphy_reset, but:
a) must support 10G PHYs, and
b) should use the phylib primitives,

we implement miiphy_reset, using phy_reset(), but only when
CONFIG_PHYLIB is set. Otherwise, we just use the old version. In this
way, we save on compile size, even if we don't manage to save code size.

Pulled ethtool.h and mdio.h from:
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6
782d640afd15af7a1faf01cfe566ca4ac511319d
With many, many deletions so as to enable compilation under u-boot

Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Detlev Zundel <dzu@denx.de>

1 files changed, 105 insertions, 0 deletions

diff --git a/drivers/net/phy/generic_10g.c b/drivers/net/phy/generic_10g.c
new file mode 100644
index 0000000000..315c50867d
--- /dev/null
+++ b/drivers/net/phy/generic_10g.c
@@ -0,0 +1,105 @@
+/*
+ * Generic PHY Management code
+ *
+ * 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
+ *
+ *
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ * author Andy Fleming
+ *
+ * Based loosely off of Linux's PHY Lib
+ */
+
+#include <config.h>
+#include <common.h>
+#include <miiphy.h>
+#include <phy.h>
+
+int gen10g_shutdown(struct phy_device *phydev)
+{
+	return 0;
+}
+
+int gen10g_startup(struct phy_device *phydev)
+{
+	int devad, reg;
+	u32 mmd_mask = phydev->mmds;
+
+	phydev->link = 1;
+
+	/* For now just lie and say it's 10G all the time */
+	phydev->speed = SPEED_10000;
+	phydev->duplex = DUPLEX_FULL;
+
+	for (devad = 0; mmd_mask; devad++, mmd_mask = mmd_mask >> 1) {
+		if (!mmd_mask & 1)
+			continue;
+
+		/* Read twice because link state is latched and a
+		 * read moves the current state into the register */
+		phy_read(phydev, devad, MDIO_STAT1);
+		reg = phy_read(phydev, devad, MDIO_STAT1);
+		if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
+			phydev->link = 0;
+	}
+
+	return 0;
+}
+
+int gen10g_discover_mmds(struct phy_device *phydev)
+{
+	int mmd, stat2, devs1, devs2;
+
+	/* Assume PHY must have at least one of PMA/PMD, WIS, PCS, PHY
+	 * XS or DTE XS; give up if none is present. */
+	for (mmd = 1; mmd <= 5; mmd++) {
+		/* Is this MMD present? */
+		stat2 = phy_read(phydev, mmd, MDIO_STAT2);
+		if (stat2 < 0 ||
+			(stat2 & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL)
+			continue;
+
+		/* It should tell us about all the other MMDs */
+		devs1 = phy_read(phydev, mmd, MDIO_DEVS1);
+		devs2 = phy_read(phydev, mmd, MDIO_DEVS2);
+		if (devs1 < 0 || devs2 < 0)
+			continue;
+
+		phydev->mmds = devs1 | (devs2 << 16);
+		return 0;
+	}
+
+	return 0;
+}
+
+int gen10g_config(struct phy_device *phydev)
+{
+	/* For now, assume 10000baseT. Fill in later */
+	phydev->supported = phydev->advertising = SUPPORTED_10000baseT_Full;
+
+	return gen10g_discover_mmds(phydev);
+}
+
+struct phy_driver gen10g_driver = {
+	.uid		= 0xffffffff,
+	.mask		= 0xffffffff,
+	.name		= "Generic 10G PHY",
+	.features	= 0,
+	.config		= gen10g_config,
+	.startup	= gen10g_startup,
+	.shutdown	= gen10g_shutdown,
+};
+