amd-xgbe: Initial AMD 10GbE platform driver

This patch provides the initial platform driver for the AMD
10GbE device.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 433 insertions, 0 deletions

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
new file mode 100644
index 000000000000..52bbdbf1a2cc
--- /dev/null
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
@@ -0,0 +1,433 @@
+/*
+ * AMD 10Gb Ethernet driver
+ *
+ * This file is available to you under your choice of the following two
+ * licenses:
+ *
+ * License 1: GPLv2
+ *
+ * Copyright (c) 2014 Advanced Micro Devices, Inc.
+ *
+ * This file is free software; you may copy, redistribute 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 file 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, see <http://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
+ *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
+ *     Inc. unless otherwise expressly agreed to in writing between Synopsys
+ *     and you.
+ *
+ *     The Software IS NOT an item of Licensed Software or Licensed Product
+ *     under any End User Software License Agreement or Agreement for Licensed
+ *     Product with Synopsys or any supplement thereto.  Permission is hereby
+ *     granted, free of charge, to any person obtaining a copy of this software
+ *     annotated with this license and the Software, to deal in the Software
+ *     without restriction, including without limitation the rights to use,
+ *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ *     of the Software, and to permit persons to whom the Software is furnished
+ *     to do so, subject to the following conditions:
+ *
+ *     The above copyright notice and this permission notice shall be included
+ *     in all copies or substantial portions of the Software.
+ *
+ *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
+ *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
+ *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ *     THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *
+ * License 2: Modified BSD
+ *
+ * Copyright (c) 2014 Advanced Micro Devices, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Advanced Micro Devices, Inc. nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
+ *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
+ *     Inc. unless otherwise expressly agreed to in writing between Synopsys
+ *     and you.
+ *
+ *     The Software IS NOT an item of Licensed Software or Licensed Product
+ *     under any End User Software License Agreement or Agreement for Licensed
+ *     Product with Synopsys or any supplement thereto.  Permission is hereby
+ *     granted, free of charge, to any person obtaining a copy of this software
+ *     annotated with this license and the Software, to deal in the Software
+ *     without restriction, including without limitation the rights to use,
+ *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ *     of the Software, and to permit persons to whom the Software is furnished
+ *     to do so, subject to the following conditions:
+ *
+ *     The above copyright notice and this permission notice shall be included
+ *     in all copies or substantial portions of the Software.
+ *
+ *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
+ *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
+ *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ *     THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/spinlock.h>
+#include <linux/mdio.h>
+#include <linux/phy.h>
+#include <linux/of.h>
+
+#include "xgbe.h"
+#include "xgbe-common.h"
+
+
+static int xgbe_mdio_read(struct mii_bus *mii, int prtad, int mmd_reg)
+{
+	struct xgbe_prv_data *pdata = mii->priv;
+	struct xgbe_hw_if *hw_if = &pdata->hw_if;
+	int mmd_data;
+
+	DBGPR_MDIO("-->xgbe_mdio_read: prtad=%#x mmd_reg=%#x\n",
+		   prtad, mmd_reg);
+
+	mmd_data = hw_if->read_mmd_regs(pdata, prtad, mmd_reg);
+
+	DBGPR_MDIO("<--xgbe_mdio_read: mmd_data=%#x\n", mmd_data);
+
+	return mmd_data;
+}
+
+static int xgbe_mdio_write(struct mii_bus *mii, int prtad, int mmd_reg,
+			   u16 mmd_val)
+{
+	struct xgbe_prv_data *pdata = mii->priv;
+	struct xgbe_hw_if *hw_if = &pdata->hw_if;
+	int mmd_data = mmd_val;
+
+	DBGPR_MDIO("-->xgbe_mdio_write: prtad=%#x mmd_reg=%#x mmd_data=%#x\n",
+		   prtad, mmd_reg, mmd_data);
+
+	hw_if->write_mmd_regs(pdata, prtad, mmd_reg, mmd_data);
+
+	DBGPR_MDIO("<--xgbe_mdio_write\n");
+
+	return 0;
+}
+
+static void xgbe_adjust_link(struct net_device *netdev)
+{
+	struct xgbe_prv_data *pdata = netdev_priv(netdev);
+	struct xgbe_hw_if *hw_if = &pdata->hw_if;
+	struct phy_device *phydev = pdata->phydev;
+	unsigned long flags;
+	int new_state = 0;
+
+	if (phydev == NULL)
+		return;
+
+	DBGPR_MDIO("-->xgbe_adjust_link: address=%d, newlink=%d, curlink=%d\n",
+		   phydev->addr, phydev->link, pdata->phy_link);
+
+	spin_lock_irqsave(&pdata->lock, flags);
+
+	if (phydev->link) {
+		/* Flow control support */
+		if (pdata->pause_autoneg) {
+			if (phydev->pause || phydev->asym_pause) {
+				pdata->tx_pause = 1;
+				pdata->rx_pause = 1;
+			} else {
+				pdata->tx_pause = 0;
+				pdata->rx_pause = 0;
+			}
+		}
+
+		if (pdata->tx_pause != pdata->phy_tx_pause) {
+			hw_if->config_tx_flow_control(pdata);
+			pdata->phy_tx_pause = pdata->tx_pause;
+		}
+
+		if (pdata->rx_pause != pdata->phy_rx_pause) {
+			hw_if->config_rx_flow_control(pdata);
+			pdata->phy_rx_pause = pdata->rx_pause;
+		}
+
+		/* Speed support */
+		if (phydev->speed != pdata->phy_speed) {
+			new_state = 1;
+
+			switch (phydev->speed) {
+			case SPEED_10000:
+				hw_if->set_xgmii_speed(pdata);
+				break;
+
+			case SPEED_2500:
+				hw_if->set_gmii_2500_speed(pdata);
+				break;
+
+			case SPEED_1000:
+				hw_if->set_gmii_speed(pdata);
+				break;
+			}
+			pdata->phy_speed = phydev->speed;
+		}
+
+		if (phydev->link != pdata->phy_link) {
+			new_state = 1;
+			pdata->phy_link = 1;
+		}
+	} else if (pdata->phy_link) {
+		new_state = 1;
+		pdata->phy_link = 0;
+		pdata->phy_speed = SPEED_UNKNOWN;
+	}
+
+	if (new_state)
+		phy_print_status(phydev);
+
+	spin_unlock_irqrestore(&pdata->lock, flags);
+
+	DBGPR_MDIO("<--xgbe_adjust_link\n");
+}
+
+void xgbe_dump_phy_registers(struct xgbe_prv_data *pdata)
+{
+	struct device *dev = pdata->dev;
+	struct phy_device *phydev = pdata->mii->phy_map[XGBE_PRTAD];
+	int i;
+
+	dev_alert(dev, "\n************* PHY Reg dump **********************\n");
+
+	dev_alert(dev, "PCS Control Reg (%#04x) = %#04x\n", MDIO_CTRL1,
+		  XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_CTRL1));
+	dev_alert(dev, "PCS Status Reg (%#04x) = %#04x\n", MDIO_STAT1,
+		  XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_STAT1));
+	dev_alert(dev, "Phy Id (PHYS ID 1 %#04x)= %#04x\n", MDIO_DEVID1,
+		  XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_DEVID1));
+	dev_alert(dev, "Phy Id (PHYS ID 2 %#04x)= %#04x\n", MDIO_DEVID2,
+		  XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_DEVID2));
+	dev_alert(dev, "Devices in Package (%#04x)= %#04x\n", MDIO_DEVS1,
+		  XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_DEVS1));
+	dev_alert(dev, "Devices in Package (%#04x)= %#04x\n", MDIO_DEVS2,
+		  XMDIO_READ(pdata, MDIO_MMD_PCS, MDIO_DEVS2));
+
+	dev_alert(dev, "Auto-Neg Control Reg (%#04x) = %#04x\n", MDIO_CTRL1,
+		  XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_CTRL1));
+	dev_alert(dev, "Auto-Neg Status Reg (%#04x) = %#04x\n", MDIO_STAT1,
+		  XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_STAT1));
+	dev_alert(dev, "Auto-Neg Ad Reg 1 (%#04x) = %#04x\n",
+		  MDIO_AN_ADVERTISE,
+		  XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE));
+	dev_alert(dev, "Auto-Neg Ad Reg 2 (%#04x) = %#04x\n",
+		  MDIO_AN_ADVERTISE + 1,
+		  XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE + 1));
+	dev_alert(dev, "Auto-Neg Ad Reg 3 (%#04x) = %#04x\n",
+		  MDIO_AN_ADVERTISE + 2,
+		  XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_ADVERTISE + 2));
+	dev_alert(dev, "Auto-Neg Completion Reg (%#04x) = %#04x\n",
+		  MDIO_AN_COMP_STAT,
+		  XMDIO_READ(pdata, MDIO_MMD_AN, MDIO_AN_COMP_STAT));
+
+	dev_alert(dev, "MMD Device Mask = %#x\n",
+		  phydev->c45_ids.devices_in_package);
+	for (i = 0; i < ARRAY_SIZE(phydev->c45_ids.device_ids); i++)
+		dev_alert(dev, "  MMD %d: ID = %#08x\n", i,
+			  phydev->c45_ids.device_ids[i]);
+
+	dev_alert(dev, "\n*************************************************\n");
+}
+
+int xgbe_mdio_register(struct xgbe_prv_data *pdata)
+{
+	struct net_device *netdev = pdata->netdev;
+	struct device_node *phy_node;
+	struct mii_bus *mii;
+	struct phy_device *phydev;
+	int ret = 0;
+
+	DBGPR("-->xgbe_mdio_register\n");
+
+	/* Retrieve the phy-handle */
+	phy_node = of_parse_phandle(pdata->dev->of_node, "phy-handle", 0);
+	if (!phy_node) {
+		dev_err(pdata->dev, "unable to parse phy-handle\n");
+		return -EINVAL;
+	}
+
+	/* Register with the MDIO bus */
+	mii = mdiobus_alloc();
+	if (mii == NULL) {
+		dev_err(pdata->dev, "mdiobus_alloc failed\n");
+		ret = -ENOMEM;
+		goto err_node_get;
+	}
+
+	/* Register on the MDIO bus (don't probe any PHYs) */
+	mii->name = XGBE_PHY_NAME;
+	mii->read = xgbe_mdio_read;
+	mii->write = xgbe_mdio_write;
+	snprintf(mii->id, sizeof(mii->id), "%s", pdata->mii_bus_id);
+	mii->priv = pdata;
+	mii->phy_mask = ~0;
+	mii->parent = pdata->dev;
+	ret = mdiobus_register(mii);
+	if (ret) {
+		dev_err(pdata->dev, "mdiobus_register failed\n");
+		goto err_mdiobus_alloc;
+	}
+	DBGPR("  mdiobus_register succeeded for %s\n", pdata->mii_bus_id);
+
+	/* Probe the PCS using Clause 45 */
+	phydev = get_phy_device(mii, XGBE_PRTAD, true);
+	if (IS_ERR(phydev) || !phydev ||
+	    !phydev->c45_ids.device_ids[MDIO_MMD_PCS]) {
+		dev_err(pdata->dev, "get_phy_device failed\n");
+		ret = phydev ? PTR_ERR(phydev) : -ENOLINK;
+		goto err_mdiobus_register;
+	}
+	request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT,
+		       MDIO_ID_ARGS(phydev->c45_ids.device_ids[MDIO_MMD_PCS]));
+
+	of_node_get(phy_node);
+	phydev->dev.of_node = phy_node;
+	ret = phy_device_register(phydev);
+	if (ret) {
+		dev_err(pdata->dev, "phy_device_register failed\n");
+		of_node_put(phy_node);
+		goto err_phy_device;
+	}
+
+	/* Add a reference to the PHY driver so it can't be unloaded */
+	pdata->phy_module = phydev->dev.driver ?
+			    phydev->dev.driver->owner : NULL;
+	if (!try_module_get(pdata->phy_module)) {
+		dev_err(pdata->dev, "try_module_get failed\n");
+		ret = -EIO;
+		goto err_phy_device;
+	}
+
+	pdata->mii = mii;
+	pdata->mdio_mmd = MDIO_MMD_PCS;
+
+	pdata->phy_link = -1;
+	pdata->phy_speed = SPEED_UNKNOWN;
+	pdata->phy_tx_pause = pdata->tx_pause;
+	pdata->phy_rx_pause = pdata->rx_pause;
+
+	ret = phy_connect_direct(netdev, phydev, &xgbe_adjust_link,
+				 pdata->phy_mode);
+	if (ret) {
+		netdev_err(netdev, "phy_connect_direct failed\n");
+		goto err_phy_device;
+	}
+
+	if (!phydev->drv || (phydev->drv->phy_id == 0)) {
+		netdev_err(netdev, "phy_id not valid\n");
+		return -ENODEV;
+		goto err_phy_connect;
+	}
+	DBGPR("  phy_connect_direct succeeded for PHY %s, link=%d\n",
+	      dev_name(&phydev->dev), phydev->link);
+
+	phydev->autoneg = pdata->default_autoneg;
+	if (phydev->autoneg == AUTONEG_DISABLE) {
+		/* Add settings needed to force speed */
+		phydev->supported |= SUPPORTED_1000baseT_Full;
+		phydev->supported |= SUPPORTED_10000baseT_Full;
+
+		phydev->speed = pdata->default_speed;
+		phydev->duplex = DUPLEX_FULL;
+
+		phydev->advertising &= ~ADVERTISED_Autoneg;
+	}
+
+	pdata->phydev = phydev;
+
+	of_node_put(phy_node);
+
+	DBGPHY_REGS(pdata);
+
+	DBGPR("<--xgbe_mdio_register\n");
+
+	return 0;
+
+err_phy_connect:
+	phy_disconnect(phydev);
+
+err_phy_device:
+	phy_device_free(phydev);
+
+err_mdiobus_register:
+	mdiobus_unregister(mii);
+
+err_mdiobus_alloc:
+	mdiobus_free(mii);
+
+err_node_get:
+	of_node_put(phy_node);
+
+	return ret;
+}
+
+void xgbe_mdio_unregister(struct xgbe_prv_data *pdata)
+{
+	DBGPR("-->xgbe_mdio_unregister\n");
+
+	phy_disconnect(pdata->phydev);
+	pdata->phydev = NULL;
+
+	module_put(pdata->phy_module);
+	pdata->phy_module = NULL;
+
+	mdiobus_unregister(pdata->mii);
+	pdata->mii->priv = NULL;
+
+	mdiobus_free(pdata->mii);
+	pdata->mii = NULL;
+
+	DBGPR("<--xgbe_mdio_unregister\n");
+}