Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 323 insertions, 0 deletions

diff --git a/kernel/drivers/net/ethernet/sfc/mdio_10g.c b/kernel/drivers/net/ethernet/sfc/mdio_10g.c
new file mode 100644
index 000000000..8ff954c59
--- /dev/null
+++ b/kernel/drivers/net/ethernet/sfc/mdio_10g.c
@@ -0,0 +1,323 @@
+/****************************************************************************
+ * Driver for Solarflare network controllers and boards
+ * Copyright 2006-2011 Solarflare Communications Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation, incorporated herein by reference.
+ */
+/*
+ * Useful functions for working with MDIO clause 45 PHYs
+ */
+#include <linux/types.h>
+#include <linux/ethtool.h>
+#include <linux/delay.h>
+#include "net_driver.h"
+#include "mdio_10g.h"
+#include "workarounds.h"
+
+unsigned efx_mdio_id_oui(u32 id)
+{
+	unsigned oui = 0;
+	int i;
+
+	/* The bits of the OUI are designated a..x, with a=0 and b variable.
+	 * In the id register c is the MSB but the OUI is conventionally
+	 * written as bytes h..a, p..i, x..q.  Reorder the bits accordingly. */
+	for (i = 0; i < 22; ++i)
+		if (id & (1 << (i + 10)))
+			oui |= 1 << (i ^ 7);
+
+	return oui;
+}
+
+int efx_mdio_reset_mmd(struct efx_nic *port, int mmd,
+			    int spins, int spintime)
+{
+	u32 ctrl;
+
+	/* Catch callers passing values in the wrong units (or just silly) */
+	EFX_BUG_ON_PARANOID(spins * spintime >= 5000);
+
+	efx_mdio_write(port, mmd, MDIO_CTRL1, MDIO_CTRL1_RESET);
+	/* Wait for the reset bit to clear. */
+	do {
+		msleep(spintime);
+		ctrl = efx_mdio_read(port, mmd, MDIO_CTRL1);
+		spins--;
+
+	} while (spins && (ctrl & MDIO_CTRL1_RESET));
+
+	return spins ? spins : -ETIMEDOUT;
+}
+
+static int efx_mdio_check_mmd(struct efx_nic *efx, int mmd)
+{
+	int status;
+
+	if (mmd != MDIO_MMD_AN) {
+		/* Read MMD STATUS2 to check it is responding. */
+		status = efx_mdio_read(efx, mmd, MDIO_STAT2);
+		if ((status & MDIO_STAT2_DEVPRST) != MDIO_STAT2_DEVPRST_VAL) {
+			netif_err(efx, hw, efx->net_dev,
+				  "PHY MMD %d not responding.\n", mmd);
+			return -EIO;
+		}
+	}
+
+	return 0;
+}
+
+/* This ought to be ridiculous overkill. We expect it to fail rarely */
+#define MDIO45_RESET_TIME	1000 /* ms */
+#define MDIO45_RESET_ITERS	100
+
+int efx_mdio_wait_reset_mmds(struct efx_nic *efx, unsigned int mmd_mask)
+{
+	const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
+	int tries = MDIO45_RESET_ITERS;
+	int rc = 0;
+	int in_reset;
+
+	while (tries) {
+		int mask = mmd_mask;
+		int mmd = 0;
+		int stat;
+		in_reset = 0;
+		while (mask) {
+			if (mask & 1) {
+				stat = efx_mdio_read(efx, mmd, MDIO_CTRL1);
+				if (stat < 0) {
+					netif_err(efx, hw, efx->net_dev,
+						  "failed to read status of"
+						  " MMD %d\n", mmd);
+					return -EIO;
+				}
+				if (stat & MDIO_CTRL1_RESET)
+					in_reset |= (1 << mmd);
+			}
+			mask = mask >> 1;
+			mmd++;
+		}
+		if (!in_reset)
+			break;
+		tries--;
+		msleep(spintime);
+	}
+	if (in_reset != 0) {
+		netif_err(efx, hw, efx->net_dev,
+			  "not all MMDs came out of reset in time."
+			  " MMDs still in reset: %x\n", in_reset);
+		rc = -ETIMEDOUT;
+	}
+	return rc;
+}
+
+int efx_mdio_check_mmds(struct efx_nic *efx, unsigned int mmd_mask)
+{
+	int mmd = 0, probe_mmd, devs1, devs2;
+	u32 devices;
+
+	/* Historically we have probed the PHYXS to find out what devices are
+	 * present,but that doesn't work so well if the PHYXS isn't expected
+	 * to exist, if so just find the first item in the list supplied. */
+	probe_mmd = (mmd_mask & MDIO_DEVS_PHYXS) ? MDIO_MMD_PHYXS :
+	    __ffs(mmd_mask);
+
+	/* Check all the expected MMDs are present */
+	devs1 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS1);
+	devs2 = efx_mdio_read(efx, probe_mmd, MDIO_DEVS2);
+	if (devs1 < 0 || devs2 < 0) {
+		netif_err(efx, hw, efx->net_dev,
+			  "failed to read devices present\n");
+		return -EIO;
+	}
+	devices = devs1 | (devs2 << 16);
+	if ((devices & mmd_mask) != mmd_mask) {
+		netif_err(efx, hw, efx->net_dev,
+			  "required MMDs not present: got %x, wanted %x\n",
+			  devices, mmd_mask);
+		return -ENODEV;
+	}
+	netif_vdbg(efx, hw, efx->net_dev, "Devices present: %x\n", devices);
+
+	/* Check all required MMDs are responding and happy. */
+	while (mmd_mask) {
+		if ((mmd_mask & 1) && efx_mdio_check_mmd(efx, mmd))
+			return -EIO;
+		mmd_mask = mmd_mask >> 1;
+		mmd++;
+	}
+
+	return 0;
+}
+
+bool efx_mdio_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
+{
+	/* If the port is in loopback, then we should only consider a subset
+	 * of mmd's */
+	if (LOOPBACK_INTERNAL(efx))
+		return true;
+	else if (LOOPBACK_MASK(efx) & LOOPBACKS_WS)
+		return false;
+	else if (efx_phy_mode_disabled(efx->phy_mode))
+		return false;
+	else if (efx->loopback_mode == LOOPBACK_PHYXS)
+		mmd_mask &= ~(MDIO_DEVS_PHYXS |
+			      MDIO_DEVS_PCS |
+			      MDIO_DEVS_PMAPMD |
+			      MDIO_DEVS_AN);
+	else if (efx->loopback_mode == LOOPBACK_PCS)
+		mmd_mask &= ~(MDIO_DEVS_PCS |
+			      MDIO_DEVS_PMAPMD |
+			      MDIO_DEVS_AN);
+	else if (efx->loopback_mode == LOOPBACK_PMAPMD)
+		mmd_mask &= ~(MDIO_DEVS_PMAPMD |
+			      MDIO_DEVS_AN);
+
+	return mdio45_links_ok(&efx->mdio, mmd_mask);
+}
+
+void efx_mdio_transmit_disable(struct efx_nic *efx)
+{
+	efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
+			  MDIO_PMA_TXDIS, MDIO_PMD_TXDIS_GLOBAL,
+			  efx->phy_mode & PHY_MODE_TX_DISABLED);
+}
+
+void efx_mdio_phy_reconfigure(struct efx_nic *efx)
+{
+	efx_mdio_set_flag(efx, MDIO_MMD_PMAPMD,
+			  MDIO_CTRL1, MDIO_PMA_CTRL1_LOOPBACK,
+			  efx->loopback_mode == LOOPBACK_PMAPMD);
+	efx_mdio_set_flag(efx, MDIO_MMD_PCS,
+			  MDIO_CTRL1, MDIO_PCS_CTRL1_LOOPBACK,
+			  efx->loopback_mode == LOOPBACK_PCS);
+	efx_mdio_set_flag(efx, MDIO_MMD_PHYXS,
+			  MDIO_CTRL1, MDIO_PHYXS_CTRL1_LOOPBACK,
+			  efx->loopback_mode == LOOPBACK_PHYXS_WS);
+}
+
+static void efx_mdio_set_mmd_lpower(struct efx_nic *efx,
+				    int lpower, int mmd)
+{
+	int stat = efx_mdio_read(efx, mmd, MDIO_STAT1);
+
+	netif_vdbg(efx, drv, efx->net_dev, "Setting low power mode for MMD %d to %d\n",
+		  mmd, lpower);
+
+	if (stat & MDIO_STAT1_LPOWERABLE) {
+		efx_mdio_set_flag(efx, mmd, MDIO_CTRL1,
+				  MDIO_CTRL1_LPOWER, lpower);
+	}
+}
+
+void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
+			      int low_power, unsigned int mmd_mask)
+{
+	int mmd = 0;
+	mmd_mask &= ~MDIO_DEVS_AN;
+	while (mmd_mask) {
+		if (mmd_mask & 1)
+			efx_mdio_set_mmd_lpower(efx, low_power, mmd);
+		mmd_mask = (mmd_mask >> 1);
+		mmd++;
+	}
+}
+
+/**
+ * efx_mdio_set_settings - Set (some of) the PHY settings over MDIO.
+ * @efx:		Efx NIC
+ * @ecmd:		New settings
+ */
+int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
+{
+	struct ethtool_cmd prev = { .cmd = ETHTOOL_GSET };
+
+	efx->phy_op->get_settings(efx, &prev);
+
+	if (ecmd->advertising == prev.advertising &&
+	    ethtool_cmd_speed(ecmd) == ethtool_cmd_speed(&prev) &&
+	    ecmd->duplex == prev.duplex &&
+	    ecmd->port == prev.port &&
+	    ecmd->autoneg == prev.autoneg)
+		return 0;
+
+	/* We can only change these settings for -T PHYs */
+	if (prev.port != PORT_TP || ecmd->port != PORT_TP)
+		return -EINVAL;
+
+	/* Check that PHY supports these settings */
+	if (!ecmd->autoneg ||
+	    (ecmd->advertising | SUPPORTED_Autoneg) & ~prev.supported)
+		return -EINVAL;
+
+	efx_link_set_advertising(efx, ecmd->advertising | ADVERTISED_Autoneg);
+	efx_mdio_an_reconfigure(efx);
+	return 0;
+}
+
+/**
+ * efx_mdio_an_reconfigure - Push advertising flags and restart autonegotiation
+ * @efx:		Efx NIC
+ */
+void efx_mdio_an_reconfigure(struct efx_nic *efx)
+{
+	int reg;
+
+	WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
+
+	/* Set up the base page */
+	reg = ADVERTISE_CSMA | ADVERTISE_RESV;
+	if (efx->link_advertising & ADVERTISED_Pause)
+		reg |= ADVERTISE_PAUSE_CAP;
+	if (efx->link_advertising & ADVERTISED_Asym_Pause)
+		reg |= ADVERTISE_PAUSE_ASYM;
+	efx_mdio_write(efx, MDIO_MMD_AN, MDIO_AN_ADVERTISE, reg);
+
+	/* Set up the (extended) next page */
+	efx->phy_op->set_npage_adv(efx, efx->link_advertising);
+
+	/* Enable and restart AN */
+	reg = efx_mdio_read(efx, MDIO_MMD_AN, MDIO_CTRL1);
+	reg |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART | MDIO_AN_CTRL1_XNP;
+	efx_mdio_write(efx, MDIO_MMD_AN, MDIO_CTRL1, reg);
+}
+
+u8 efx_mdio_get_pause(struct efx_nic *efx)
+{
+	BUILD_BUG_ON(EFX_FC_AUTO & (EFX_FC_RX | EFX_FC_TX));
+
+	if (!(efx->wanted_fc & EFX_FC_AUTO))
+		return efx->wanted_fc;
+
+	WARN_ON(!(efx->mdio.mmds & MDIO_DEVS_AN));
+
+	return mii_resolve_flowctrl_fdx(
+		mii_advertise_flowctrl(efx->wanted_fc),
+		efx_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_LPA));
+}
+
+int efx_mdio_test_alive(struct efx_nic *efx)
+{
+	int rc;
+	int devad = __ffs(efx->mdio.mmds);
+	u16 physid1, physid2;
+
+	mutex_lock(&efx->mac_lock);
+
+	physid1 = efx_mdio_read(efx, devad, MDIO_DEVID1);
+	physid2 = efx_mdio_read(efx, devad, MDIO_DEVID2);
+
+	if ((physid1 == 0x0000) || (physid1 == 0xffff) ||
+	    (physid2 == 0x0000) || (physid2 == 0xffff)) {
+		netif_err(efx, hw, efx->net_dev,
+			  "no MDIO PHY present with ID %d\n", efx->mdio.prtad);
+		rc = -EINVAL;
+	} else {
+		rc = efx_mdio_check_mmds(efx, efx->mdio.mmds);
+	}
+
+	mutex_unlock(&efx->mac_lock);
+	return rc;
+}