net: ethernet: Add a driver for Gemini gigabit ethernet

The Gemini ethernet has been around for years as an out-of-tree
patch used with the NAS boxen and routers built on StorLink
SL3512 and SL3516, later Storm Semiconductor, later Cortina
Systems. These ASICs are still being deployed and brand new
off-the-shelf systems using it can easily be acquired.

The full name of the IP block is "Net Engine and Gigabit
Ethernet MAC" commonly just called "GMAC".

The hardware block contains a common TCP Offload Enginer (TOE)
that can be used by both MACs. The current driver does not use
it.

Cc: Tobias Waldvogel <tobias.waldvogel@gmail.com>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 3581 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index e22ca0ae995d..9e0fd33998ac 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1327,8 +1327,10 @@ T:	git git://github.com/ulli-kroll/linux.git
 S:	Maintained
 F:	Documentation/devicetree/bindings/arm/gemini.txt
 F:	Documentation/devicetree/bindings/pinctrl/cortina,gemini-pinctrl.txt
+F:	Documentation/devicetree/bindings/net/cortina,gemini-ethernet.txt
 F:	Documentation/devicetree/bindings/rtc/faraday,ftrtc010.txt
 F:	arch/arm/mach-gemini/
+F:	drivers/net/ethernet/cortina/gemini/*
 F:	drivers/pinctrl/pinctrl-gemini.c
 F:	drivers/rtc/rtc-ftrtc010.c
 
diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index d50519ed7549..b6cf4b6962f5 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -42,6 +42,7 @@ source "drivers/net/ethernet/cavium/Kconfig"
 source "drivers/net/ethernet/chelsio/Kconfig"
 source "drivers/net/ethernet/cirrus/Kconfig"
 source "drivers/net/ethernet/cisco/Kconfig"
+source "drivers/net/ethernet/cortina/Kconfig"
 
 config CX_ECAT
 	tristate "Beckhoff CX5020 EtherCAT master support"
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index 6cf5aded9423..3cdf01e96e0b 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_NET_VENDOR_CAVIUM) += cavium/
 obj-$(CONFIG_NET_VENDOR_CHELSIO) += chelsio/
 obj-$(CONFIG_NET_VENDOR_CIRRUS) += cirrus/
 obj-$(CONFIG_NET_VENDOR_CISCO) += cisco/
+obj-$(CONFIG_NET_VENDOR_CORTINA) += cortina/
 obj-$(CONFIG_CX_ECAT) += ec_bhf.o
 obj-$(CONFIG_DM9000) += davicom/
 obj-$(CONFIG_DNET) += dnet.o
diff --git a/drivers/net/ethernet/cortina/Kconfig b/drivers/net/ethernet/cortina/Kconfig
new file mode 100644
index 000000000000..0df743ea51f1
--- /dev/null
+++ b/drivers/net/ethernet/cortina/Kconfig
@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0
+# Cortina ethernet devices
+
+config NET_VENDOR_CORTINA
+	bool "Cortina Gemini devices"
+	default y
+	---help---
+	  If you have a network (Ethernet) card belonging to this class, say Y
+	  and read the Ethernet-HOWTO, available from
+	  <http://www.tldp.org/docs.html#howto>.
+
+if NET_VENDOR_CORTINA
+
+config GEMINI_ETHERNET
+	tristate "Gemini Gigabit Ethernet support"
+	depends on OF
+	select PHYLIB
+	select CRC32
+	---help---
+	  This driver supports StorLink SL351x (Gemini) dual Gigabit Ethernet.
+
+endif # NET_VENDOR_CORTINA
diff --git a/drivers/net/ethernet/cortina/Makefile b/drivers/net/ethernet/cortina/Makefile
new file mode 100644
index 000000000000..4e86d398a89c
--- /dev/null
+++ b/drivers/net/ethernet/cortina/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for the Cortina Gemini network device drivers.
+
+obj-$(CONFIG_GEMINI_ETHERNET) += gemini.o
diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/cortina/gemini.c
new file mode 100644
index 000000000000..5eb999af2c40
--- /dev/null
+++ b/drivers/net/ethernet/cortina/gemini.c
@@ -0,0 +1,2593 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Ethernet device driver for Cortina Systems Gemini SoC
+ * Also known as the StorLink SL3512 and SL3516 (SL351x) or Lepus
+ * Net Engine and Gigabit Ethernet MAC (GMAC)
+ * This hardware contains a TCP Offload Engine (TOE) but currently the
+ * driver does not make use of it.
+ *
+ * Authors:
+ * Linus Walleij <linus.walleij@linaro.org>
+ * Tobias Waldvogel <tobias.waldvogel@gmail.com> (OpenWRT)
+ * Michał Mirosław <mirq-linux@rere.qmqm.pl>
+ * Paulius Zaleckas <paulius.zaleckas@gmail.com>
+ * Giuseppe De Robertis <Giuseppe.DeRobertis@ba.infn.it>
+ * Gary Chen & Ch Hsu Storlink Semiconductor
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/cache.h>
+#include <linux/interrupt.h>
+#include <linux/reset.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+#include <linux/of_platform.h>
+#include <linux/etherdevice.h>
+#include <linux/if_vlan.h>
+#include <linux/skbuff.h>
+#include <linux/phy.h>
+#include <linux/crc32.h>
+#include <linux/ethtool.h>
+#include <linux/tcp.h>
+#include <linux/u64_stats_sync.h>
+
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+
+#include "gemini.h"
+
+#define DRV_NAME		"gmac-gemini"
+#define DRV_VERSION		"1.0"
+
+#define HSIZE_8			0x00
+#define HSIZE_16		0x01
+#define HSIZE_32		0x02
+
+#define HBURST_SINGLE		0x00
+#define HBURST_INCR		0x01
+#define HBURST_INCR4		0x02
+#define HBURST_INCR8		0x03
+
+#define HPROT_DATA_CACHE	BIT(0)
+#define HPROT_PRIVILIGED	BIT(1)
+#define HPROT_BUFFERABLE	BIT(2)
+#define HPROT_CACHABLE		BIT(3)
+
+#define DEFAULT_RX_COALESCE_NSECS	0
+#define DEFAULT_GMAC_RXQ_ORDER		9
+#define DEFAULT_GMAC_TXQ_ORDER		8
+#define DEFAULT_RX_BUF_ORDER		11
+#define DEFAULT_NAPI_WEIGHT		64
+#define TX_MAX_FRAGS			16
+#define TX_QUEUE_NUM			1	/* max: 6 */
+#define RX_MAX_ALLOC_ORDER		2
+
+#define GMAC0_IRQ0_2 (GMAC0_TXDERR_INT_BIT | GMAC0_TXPERR_INT_BIT | \
+		      GMAC0_RXDERR_INT_BIT | GMAC0_RXPERR_INT_BIT)
+#define GMAC0_IRQ0_TXQ0_INTS (GMAC0_SWTQ00_EOF_INT_BIT | \
+			      GMAC0_SWTQ00_FIN_INT_BIT)
+#define GMAC0_IRQ4_8 (GMAC0_MIB_INT_BIT | GMAC0_RX_OVERRUN_INT_BIT)
+
+#define GMAC_OFFLOAD_FEATURES (NETIF_F_SG | NETIF_F_IP_CSUM | \
+		NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM | \
+		NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)
+
+/**
+ * struct gmac_queue_page - page buffer per-page info
+ */
+struct gmac_queue_page {
+	struct page *page;
+	dma_addr_t mapping;
+};
+
+struct gmac_txq {
+	struct gmac_txdesc *ring;
+	struct sk_buff	**skb;
+	unsigned int	cptr;
+	unsigned int	noirq_packets;
+};
+
+struct gemini_ethernet;
+
+struct gemini_ethernet_port {
+	u8 id; /* 0 or 1 */
+
+	struct gemini_ethernet *geth;
+	struct net_device *netdev;
+	struct device *dev;
+	void __iomem *dma_base;
+	void __iomem *gmac_base;
+	struct clk *pclk;
+	struct reset_control *reset;
+	int irq;
+	__le32 mac_addr[3];
+
+	void __iomem		*rxq_rwptr;
+	struct gmac_rxdesc	*rxq_ring;
+	unsigned int		rxq_order;
+
+	struct napi_struct	napi;
+	struct hrtimer		rx_coalesce_timer;
+	unsigned int		rx_coalesce_nsecs;
+	unsigned int		freeq_refill;
+	struct gmac_txq		txq[TX_QUEUE_NUM];
+	unsigned int		txq_order;
+	unsigned int		irq_every_tx_packets;
+
+	dma_addr_t		rxq_dma_base;
+	dma_addr_t		txq_dma_base;
+
+	unsigned int		msg_enable;
+	spinlock_t		config_lock; /* Locks config register */
+
+	struct u64_stats_sync	tx_stats_syncp;
+	struct u64_stats_sync	rx_stats_syncp;
+	struct u64_stats_sync	ir_stats_syncp;
+
+	struct rtnl_link_stats64 stats;
+	u64			hw_stats[RX_STATS_NUM];
+	u64			rx_stats[RX_STATUS_NUM];
+	u64			rx_csum_stats[RX_CHKSUM_NUM];
+	u64			rx_napi_exits;
+	u64			tx_frag_stats[TX_MAX_FRAGS];
+	u64			tx_frags_linearized;
+	u64			tx_hw_csummed;
+};
+
+struct gemini_ethernet {
+	struct device *dev;
+	void __iomem *base;
+	struct gemini_ethernet_port *port0;
+	struct gemini_ethernet_port *port1;
+
+	spinlock_t	irq_lock; /* Locks IRQ-related registers */
+	unsigned int	freeq_order;
+	unsigned int	freeq_frag_order;
+	struct gmac_rxdesc *freeq_ring;
+	dma_addr_t	freeq_dma_base;
+	struct gmac_queue_page	*freeq_pages;
+	unsigned int	num_freeq_pages;
+	spinlock_t	freeq_lock; /* Locks queue from reentrance */
+};
+
+#define GMAC_STATS_NUM	( \
+	RX_STATS_NUM + RX_STATUS_NUM + RX_CHKSUM_NUM + 1 + \
+	TX_MAX_FRAGS + 2)
+
+static const char gmac_stats_strings[GMAC_STATS_NUM][ETH_GSTRING_LEN] = {
+	"GMAC_IN_DISCARDS",
+	"GMAC_IN_ERRORS",
+	"GMAC_IN_MCAST",
+	"GMAC_IN_BCAST",
+	"GMAC_IN_MAC1",
+	"GMAC_IN_MAC2",
+	"RX_STATUS_GOOD_FRAME",
+	"RX_STATUS_TOO_LONG_GOOD_CRC",
+	"RX_STATUS_RUNT_FRAME",
+	"RX_STATUS_SFD_NOT_FOUND",
+	"RX_STATUS_CRC_ERROR",
+	"RX_STATUS_TOO_LONG_BAD_CRC",
+	"RX_STATUS_ALIGNMENT_ERROR",
+	"RX_STATUS_TOO_LONG_BAD_ALIGN",
+	"RX_STATUS_RX_ERR",
+	"RX_STATUS_DA_FILTERED",
+	"RX_STATUS_BUFFER_FULL",
+	"RX_STATUS_11",
+	"RX_STATUS_12",
+	"RX_STATUS_13",
+	"RX_STATUS_14",
+	"RX_STATUS_15",
+	"RX_CHKSUM_IP_UDP_TCP_OK",
+	"RX_CHKSUM_IP_OK_ONLY",
+	"RX_CHKSUM_NONE",
+	"RX_CHKSUM_3",
+	"RX_CHKSUM_IP_ERR_UNKNOWN",
+	"RX_CHKSUM_IP_ERR",
+	"RX_CHKSUM_TCP_UDP_ERR",
+	"RX_CHKSUM_7",
+	"RX_NAPI_EXITS",
+	"TX_FRAGS[1]",
+	"TX_FRAGS[2]",
+	"TX_FRAGS[3]",
+	"TX_FRAGS[4]",
+	"TX_FRAGS[5]",
+	"TX_FRAGS[6]",
+	"TX_FRAGS[7]",
+	"TX_FRAGS[8]",
+	"TX_FRAGS[9]",
+	"TX_FRAGS[10]",
+	"TX_FRAGS[11]",
+	"TX_FRAGS[12]",
+	"TX_FRAGS[13]",
+	"TX_FRAGS[14]",
+	"TX_FRAGS[15]",
+	"TX_FRAGS[16+]",
+	"TX_FRAGS_LINEARIZED",
+	"TX_HW_CSUMMED",
+};
+
+static void gmac_dump_dma_state(struct net_device *netdev);
+
+static void gmac_update_config0_reg(struct net_device *netdev,
+				    u32 val, u32 vmask)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&port->config_lock, flags);
+
+	reg = readl(port->gmac_base + GMAC_CONFIG0);
+	reg = (reg & ~vmask) | val;
+	writel(reg, port->gmac_base + GMAC_CONFIG0);
+
+	spin_unlock_irqrestore(&port->config_lock, flags);
+}
+
+static void gmac_enable_tx_rx(struct net_device *netdev)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&port->config_lock, flags);
+
+	reg = readl(port->gmac_base + GMAC_CONFIG0);
+	reg &= ~CONFIG0_TX_RX_DISABLE;
+	writel(reg, port->gmac_base + GMAC_CONFIG0);
+
+	spin_unlock_irqrestore(&port->config_lock, flags);
+}
+
+static void gmac_disable_tx_rx(struct net_device *netdev)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	unsigned long flags;
+	u32 val;
+
+	spin_lock_irqsave(&port->config_lock, flags);
+
+	val = readl(port->gmac_base + GMAC_CONFIG0);
+	val |= CONFIG0_TX_RX_DISABLE;
+	writel(val, port->gmac_base + GMAC_CONFIG0);
+
+	spin_unlock_irqrestore(&port->config_lock, flags);
+
+	mdelay(10);	/* let GMAC consume packet */
+}
+
+static void gmac_set_flow_control(struct net_device *netdev, bool tx, bool rx)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	unsigned long flags;
+	u32 val;
+
+	spin_lock_irqsave(&port->config_lock, flags);
+
+	val = readl(port->gmac_base + GMAC_CONFIG0);
+	val &= ~CONFIG0_FLOW_CTL;
+	if (tx)
+		val |= CONFIG0_FLOW_TX;
+	if (rx)
+		val |= CONFIG0_FLOW_RX;
+	writel(val, port->gmac_base + GMAC_CONFIG0);
+
+	spin_unlock_irqrestore(&port->config_lock, flags);
+}
+
+static void gmac_speed_set(struct net_device *netdev)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	struct phy_device *phydev = netdev->phydev;
+	union gmac_status status, old_status;
+	int pause_tx = 0;
+	int pause_rx = 0;
+
+	status.bits32 = readl(port->gmac_base + GMAC_STATUS);
+	old_status.bits32 = status.bits32;
+	status.bits.link = phydev->link;
+	status.bits.duplex = phydev->duplex;
+
+	switch (phydev->speed) {
+	case 1000:
+		status.bits.speed = GMAC_SPEED_1000;
+		if (phydev->interface == PHY_INTERFACE_MODE_RGMII)
+			status.bits.mii_rmii = GMAC_PHY_RGMII_1000;
+		netdev_info(netdev, "connect to RGMII @ 1Gbit\n");
+		break;
+	case 100:
+		status.bits.speed = GMAC_SPEED_100;
+		if (phydev->interface == PHY_INTERFACE_MODE_RGMII)
+			status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
+		netdev_info(netdev, "connect to RGMII @ 100 Mbit\n");
+		break;
+	case 10:
+		status.bits.speed = GMAC_SPEED_10;
+		if (phydev->interface == PHY_INTERFACE_MODE_RGMII)
+			status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
+		netdev_info(netdev, "connect to RGMII @ 10 Mbit\n");
+		break;
+	default:
+		netdev_warn(netdev, "Not supported PHY speed (%d)\n",
+			    phydev->speed);
+	}
+
+	if (phydev->duplex == DUPLEX_FULL) {
+		u16 lcladv = phy_read(phydev, MII_ADVERTISE);
+		u16 rmtadv = phy_read(phydev, MII_LPA);
+		u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
+
+		if (cap & FLOW_CTRL_RX)
+			pause_rx = 1;
+		if (cap & FLOW_CTRL_TX)
+			pause_tx = 1;
+	}
+
+	gmac_set_flow_control(netdev, pause_tx, pause_rx);
+
+	if (old_status.bits32 == status.bits32)
+		return;
+
+	if (netif_msg_link(port)) {
+		phy_print_status(phydev);
+		netdev_info(netdev, "link flow control: %s\n",
+			    phydev->pause
+			    ? (phydev->asym_pause ? "tx" : "both")
+			    : (phydev->asym_pause ? "rx" : "none")
+		);
+	}
+
+	gmac_disable_tx_rx(netdev);
+	writel(status.bits32, port->gmac_base + GMAC_STATUS);
+	gmac_enable_tx_rx(netdev);
+}
+
+static int gmac_setup_phy(struct net_device *netdev)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	union gmac_status status = { .bits32 = 0 };
+	struct device *dev = port->dev;
+	struct phy_device *phy;
+
+	phy = of_phy_get_and_connect(netdev,
+				     dev->of_node,
+				     gmac_speed_set);
+	if (!phy)
+		return -ENODEV;
+	netdev->phydev = phy;
+
+	netdev_info(netdev, "connected to PHY \"%s\"\n",
+		    phydev_name(phy));
+	phy_attached_print(phy, "phy_id=0x%.8lx, phy_mode=%s\n",
+			   (unsigned long)phy->phy_id,
+			   phy_modes(phy->interface));
+
+	phy->supported &= PHY_GBIT_FEATURES;
+	phy->supported |= SUPPORTED_Asym_Pause | SUPPORTED_Pause;
+	phy->advertising = phy->supported;
+
+	/* set PHY interface type */
+	switch (phy->interface) {
+	case PHY_INTERFACE_MODE_MII:
+		netdev_info(netdev, "set GMAC0 to GMII mode, GMAC1 disabled\n");
+		status.bits.mii_rmii = GMAC_PHY_MII;
+		netdev_info(netdev, "connect to MII\n");
+		break;
+	case PHY_INTERFACE_MODE_GMII:
+		netdev_info(netdev, "set GMAC0 to GMII mode, GMAC1 disabled\n");
+		status.bits.mii_rmii = GMAC_PHY_GMII;
+		netdev_info(netdev, "connect to GMII\n");
+		break;
+	case PHY_INTERFACE_MODE_RGMII:
+		dev_info(dev, "set GMAC0 and GMAC1 to MII/RGMII mode\n");
+		status.bits.mii_rmii = GMAC_PHY_RGMII_100_10;
+		netdev_info(netdev, "connect to RGMII\n");
+		break;
+	default:
+		netdev_err(netdev, "Unsupported MII interface\n");
+		phy_disconnect(phy);
+		netdev->phydev = NULL;
+		return -EINVAL;
+	}
+	writel(status.bits32, port->gmac_base + GMAC_STATUS);
+
+	return 0;
+}
+
+static int gmac_pick_rx_max_len(int max_l3_len)
+{
+	/* index = CONFIG_MAXLEN_XXX values */
+	static const int max_len[8] = {
+		1536, 1518, 1522, 1542,
+		9212, 10236, 1518, 1518
+	};
+	int i, n = 5;
+
+	max_l3_len += ETH_HLEN + VLAN_HLEN;
+
+	if (max_l3_len > max_len[n])
+		return -1;
+
+	for (i = 0; i < 5; i++) {
+		if (max_len[i] >= max_l3_len && max_len[i] < max_len[n])
+			n = i;
+	}
+
+	return n;
+}
+
+static int gmac_init(struct net_device *netdev)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	union gmac_config0 config0 = { .bits = {
+		.dis_tx = 1,
+		.dis_rx = 1,
+		.ipv4_rx_chksum = 1,
+		.ipv6_rx_chksum = 1,
+		.rx_err_detect = 1,
+		.rgmm_edge = 1,
+		.port0_chk_hwq = 1,
+		.port1_chk_hwq = 1,
+		.port0_chk_toeq = 1,
+		.port1_chk_toeq = 1,
+		.port0_chk_classq = 1,
+		.port1_chk_classq = 1,
+	} };
+	union gmac_ahb_weight ahb_weight = { .bits = {
+		.rx_weight = 1,
+		.tx_weight = 1,
+		.hash_weight = 1,
+		.pre_req = 0x1f,
+		.tq_dv_threshold = 0,
+	} };
+	union gmac_tx_wcr0 hw_weigh = { .bits = {
+		.hw_tq3 = 1,
+		.hw_tq2 = 1,
+		.hw_tq1 = 1,
+		.hw_tq0 = 1,
+	} };
+	union gmac_tx_wcr1 sw_weigh = { .bits = {
+		.sw_tq5 = 1,
+		.sw_tq4 = 1,
+		.sw_tq3 = 1,
+		.sw_tq2 = 1,
+		.sw_tq1 = 1,
+		.sw_tq0 = 1,
+	} };
+	union gmac_config1 config1 = { .bits = {
+		.set_threshold = 16,
+		.rel_threshold = 24,
+	} };
+	union gmac_config2 config2 = { .bits = {
+		.set_threshold = 16,
+		.rel_threshold = 32,
+	} };
+	union gmac_config3 config3 = { .bits = {
+		.set_threshold = 0,
+		.rel_threshold = 0,
+	} };
+	union gmac_config0 tmp;
+	u32 val;
+
+	config0.bits.max_len = gmac_pick_rx_max_len(netdev->mtu);
+	tmp.bits32 = readl(port->gmac_base + GMAC_CONFIG0);
+	config0.bits.reserved = tmp.bits.reserved;
+	writel(config0.bits32, port->gmac_base + GMAC_CONFIG0);
+	writel(config1.bits32, port->gmac_base + GMAC_CONFIG1);
+	writel(config2.bits32, port->gmac_base + GMAC_CONFIG2);
+	writel(config3.bits32, port->gmac_base + GMAC_CONFIG3);
+
+	val = readl(port->dma_base + GMAC_AHB_WEIGHT_REG);
+	writel(ahb_weight.bits32, port->dma_base + GMAC_AHB_WEIGHT_REG);
+
+	writel(hw_weigh.bits32,
+	       port->dma_base + GMAC_TX_WEIGHTING_CTRL_0_REG);
+	writel(sw_weigh.bits32,
+	       port->dma_base + GMAC_TX_WEIGHTING_CTRL_1_REG);
+
+	port->rxq_order = DEFAULT_GMAC_RXQ_ORDER;
+	port->txq_order = DEFAULT_GMAC_TXQ_ORDER;
+	port->rx_coalesce_nsecs = DEFAULT_RX_COALESCE_NSECS;
+
+	/* Mark every quarter of the queue a packet for interrupt
+	 * in order to be able to wake up the queue if it was stopped
+	 */
+	port->irq_every_tx_packets = 1 << (port->txq_order - 2);
+
+	return 0;
+}
+
+static void gmac_uninit(struct net_device *netdev)
+{
+	if (netdev->phydev)
+		phy_disconnect(netdev->phydev);
+}
+
+static int gmac_setup_txqs(struct net_device *netdev)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	unsigned int n_txq = netdev->num_tx_queues;
+	struct gemini_ethernet *geth = port->geth;
+	size_t entries = 1 << port->txq_order;
+	struct gmac_txq *txq = port->txq;
+	struct gmac_txdesc *desc_ring;
+	size_t len = n_txq * entries;
+	struct sk_buff **skb_tab;
+	void __iomem *rwptr_reg;
+	unsigned int r;
+	int i;
+
+	rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
+
+	skb_tab = kcalloc(len, sizeof(*skb_tab), GFP_KERNEL);
+	if (!skb_tab)
+		return -ENOMEM;
+
+	desc_ring = dma_alloc_coherent(geth->dev, len * sizeof(*desc_ring),
+				       &port->txq_dma_base, GFP_KERNEL);
+
+	if (!desc_ring) {
+		kfree(skb_tab);
+		return -ENOMEM;
+	}
+
+	if (port->txq_dma_base & ~DMA_Q_BASE_MASK) {
+		dev_warn(geth->dev, "TX queue base it not aligned\n");
+		return -ENOMEM;
+	}
+
+	writel(port->txq_dma_base | port->txq_order,
+	       port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
+
+	for (i = 0; i < n_txq; i++) {
+		txq->ring = desc_ring;
+		txq->skb = skb_tab;
+		txq->noirq_packets = 0;
+
+		r = readw(rwptr_reg);
+		rwptr_reg += 2;
+		writew(r, rwptr_reg);
+		rwptr_reg += 2;
+		txq->cptr = r;
+
+		txq++;
+		desc_ring += entries;
+		skb_tab += entries;
+	}
+
+	return 0;
+}
+
+static void gmac_clean_txq(struct net_device *netdev, struct gmac_txq *txq,
+			   unsigned int r)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	unsigned int m = (1 << port->txq_order) - 1;
+	struct gemini_ethernet *geth = port->geth;
+	unsigned int c = txq->cptr;
+	union gmac_txdesc_0 word0;
+	union gmac_txdesc_1 word1;
+	unsigned int hwchksum = 0;
+	unsigned long bytes = 0;
+	struct gmac_txdesc *txd;
+	unsigned short nfrags;
+	unsigned int errs = 0;
+	unsigned int pkts = 0;
+	unsigned int word3;
+	dma_addr_t mapping;
+
+	if (c == r)
+		return;
+
+	while (c != r) {
+		txd = txq->ring + c;
+		word0 = txd->word0;
+		word1 = txd->word1;
+		mapping = txd->word2.buf_adr;
+		word3 = txd->word3.bits32;
+
+		dma_unmap_single(geth->dev, mapping,
+				 word0.bits.buffer_size, DMA_TO_DEVICE);
+
+		if (word3 & EOF_BIT)
+			dev_kfree_skb(txq->skb[c]);
+
+		c++;
+		c &= m;
+
+		if (!(word3 & SOF_BIT))
+			continue;
+
+		if (!word0.bits.status_tx_ok) {
+			errs++;
+			continue;
+		}
+
+		pkts++;
+		bytes += txd->word1.bits.byte_count;
+
+		if (word1.bits32 & TSS_CHECKUM_ENABLE)
+			hwchksum++;
+
+		nfrags = word0.bits.desc_count - 1;
+		if (nfrags) {
+			if (nfrags >= TX_MAX_FRAGS)
+				nfrags = TX_MAX_FRAGS - 1;
+
+			u64_stats_update_begin(&port->tx_stats_syncp);
+			port->tx_frag_stats[nfrags]++;
+			u64_stats_update_end(&port->ir_stats_syncp);
+		}
+	}
+
+	u64_stats_update_begin(&port->ir_stats_syncp);
+	port->stats.tx_errors += errs;
+	port->stats.tx_packets += pkts;
+	port->stats.tx_bytes += bytes;
+	port->tx_hw_csummed += hwchksum;
+	u64_stats_update_end(&port->ir_stats_syncp);
+
+	txq->cptr = c;
+}
+
+static void gmac_cleanup_txqs(struct net_device *netdev)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	unsigned int n_txq = netdev->num_tx_queues;
+	struct gemini_ethernet *geth = port->geth;
+	void __iomem *rwptr_reg;
+	unsigned int r, i;
+
+	rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
+
+	for (i = 0; i < n_txq; i++) {
+		r = readw(rwptr_reg);
+		rwptr_reg += 2;
+		writew(r, rwptr_reg);
+		rwptr_reg += 2;
+
+		gmac_clean_txq(netdev, port->txq + i, r);
+	}
+	writel(0, port->dma_base + GMAC_SW_TX_QUEUE_BASE_REG);
+
+	kfree(port->txq->skb);
+	dma_free_coherent(geth->dev,
+			  n_txq * sizeof(*port->txq->ring) << port->txq_order,
+			  port->txq->ring, port->txq_dma_base);
+}
+
+static int gmac_setup_rxq(struct net_device *netdev)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	struct gemini_ethernet *geth = port->geth;
+	struct nontoe_qhdr __iomem *qhdr;
+
+	qhdr = geth->base + TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
+	port->rxq_rwptr = &qhdr->word1;
+
+	/* Remap a slew of memory to use for the RX queue */
+	port->rxq_ring = dma_alloc_coherent(geth->dev,
+				sizeof(*port->rxq_ring) << port->rxq_order,
+				&port->rxq_dma_base, GFP_KERNEL);
+	if (!port->rxq_ring)
+		return -ENOMEM;
+	if (port->rxq_dma_base & ~NONTOE_QHDR0_BASE_MASK) {
+		dev_warn(geth->dev, "RX queue base it not aligned\n");
+		return -ENOMEM;
+	}
+
+	writel(port->rxq_dma_base | port->rxq_order, &qhdr->word0);
+	writel(0, port->rxq_rwptr);
+	return 0;
+}
+
+static struct gmac_queue_page *
+gmac_get_queue_page(struct gemini_ethernet *geth,
+		    struct gemini_ethernet_port *port,
+		    dma_addr_t addr)
+{
+	struct gmac_queue_page *gpage;
+	dma_addr_t mapping;
+	int i;
+
+	/* Only look for even pages */
+	mapping = addr & PAGE_MASK;
+
+	if (!geth->freeq_pages) {
+		dev_err(geth->dev, "try to get page with no page list\n");
+		return NULL;
+	}
+
+	/* Look up a ring buffer page from virtual mapping */
+	for (i = 0; i < geth->num_freeq_pages; i++) {
+		gpage = &geth->freeq_pages[i];
+		if (gpage->mapping == mapping)
+			return gpage;
+	}
+
+	return NULL;
+}
+
+static void gmac_cleanup_rxq(struct net_device *netdev)
+{
+	struct gemini_ethernet_port *port = netdev_priv(netdev);
+	struct gemini_ethernet *geth = port->geth;
+	struct gmac_rxdesc *rxd = port->rxq_ring;
+	static struct gmac_queue_page *gpage;
+	struct nontoe_qhdr __iomem *qhdr;
+	void __iomem *dma_reg;
+	void __iomem *ptr_reg;
+	dma_addr_t mapping;
+	union dma_rwptr rw;
+	unsigned int r, w;
+
+	qhdr = geth->base +
+		TOE_DEFAULT_Q_HDR_BASE(netdev->dev_id);
+	dma_reg = &qhdr->word0;
+	ptr_reg = &qhdr->word1;
+
+	rw.bits32 = readl(ptr_reg);
+	r = rw.bits.rptr;
+	w = rw.bits.wptr;
+	writew(r, ptr_reg + 2);
+
+	writel(0, dma_reg);
+
+	/* Loop from read pointer to write pointer of the RX queue
+	 * and free up all pages by the queue.
+	 */
+	while (r != w) {
+		mapping = rxd[r].word2.buf_adr;
+		r++;
+		r &= ((1 << port->rxq_order) - 1);
+
+		if (!mapping)
+			continue;
+
+		/* Freeq pointers are one page off */
+		gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
+		if (!gpage) {
+			dev_err(geth->dev, "could not find page\n");
+			continue;
+		}
+		/* Release the RX queue reference to the page */
+		put_page(gpage->page);
+	}
+
+	dma_free_coherent(geth->dev, sizeof(*port->rxq_ring) << port->rxq_order,
+			  port->rxq_ring, port->rxq_dma_base);
+}
+
+static struct page *geth_freeq_alloc_map_page(struct gemini_ethernet *geth,
+					      int pn)
+{
+	struct gmac_rxdesc *freeq_entry;
+	struct gmac_queue_page *gpage;
+	unsigned int fpp_order;
+	unsigned int frag_len;
+	dma_addr_t mapping;
+	struct page *page;
+	int i;
+
+	/* First allocate and DMA map a single page */
+	page = alloc_page(GFP_ATOMIC);
+	if (!page)
+		return NULL;
+
+	mapping = dma_map_single(geth->dev, page_address(page),
+				 PAGE_SIZE, DMA_FROM_DEVICE);
+	if (dma_mapping_error(geth->dev, mapping)) {
+		put_page(page);
+		return NULL;
+	}
+
+	/* The assign the page mapping (physical address) to the buffer address
+	 * in the hardware queue. PAGE_SHIFT on ARM is 12 (1 page is 4096 bytes,
+	 * 4k), and the default RX frag order is 11 (fragments are up 20 2048
+	 * bytes, 2k) so fpp_order (fragments per page order) is default 1. Thus
+	 * each page normally needs two entries in the queue.
+	 */
+	frag_len = 1 << geth->freeq_frag_order; /* Usually 2048 */
+	fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
+	freeq_entry = geth->freeq_ring + (pn << fpp_order);
+	dev_dbg(geth->dev, "allocate page %d fragment length %d fragments per page %d, freeq entry %p\n",
+		 pn, frag_len, (1 << fpp_order), freeq_entry);
+	for (i = (1 << fpp_order); i > 0; i--) {
+		freeq_entry->word2.buf_adr = mapping;
+		freeq_entry++;
+		mapping += frag_len;
+	}
+
+	/* If the freeq entry already has a page mapped, then unmap it. */
+	gpage = &geth->freeq_pages[pn];
+	if (gpage->page) {
+		mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
+		dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
+		/* This should be the last reference to the page so it gets
+		 * released
+		 */
+		put_page(gpage->page);
+	}
+
+	/* Then put our new mapping into the page table */
+	dev_dbg(geth->dev, "page %d, DMA addr: %08x, page %p\n",
+		pn, (unsigned int)mapping, page);
+	gpage->mapping = mapping;
+	gpage->page = page;
+
+	return page;
+}
+
+/**
+ * geth_fill_freeq() - Fill the freeq with empty fragments to use
+ * @geth: the ethernet adapter
+ * @refill: whether to reset the queue by filling in all freeq entries or
+ * just refill it, usually the interrupt to refill the queue happens when
+ * the queue is half empty.
+ */
+static unsigned int geth_fill_freeq(struct gemini_ethernet *geth, bool refill)
+{
+	unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
+	unsigned int count = 0;
+	unsigned int pn, epn;
+	unsigned long flags;
+	union dma_rwptr rw;
+	unsigned int m_pn;
+
+	/* Mask for page */
+	m_pn = (1 << (geth->freeq_order - fpp_order)) - 1;
+
+	spin_lock_irqsave(&geth->freeq_lock, flags);
+
+	rw.bits32 = readl(geth->base + GLOBAL_SWFQ_RWPTR_REG);
+	pn = (refill ? rw.bits.wptr : rw.bits.rptr) >> fpp_order;
+	epn = (rw.bits.rptr >> fpp_order) - 1;
+	epn &= m_pn;
+
+	/* Loop over the freeq ring buffer entries */
+	while (pn != epn) {
+		struct gmac_queue_page *gpage;
+		struct page *page;
+
+		gpage = &geth->freeq_pages[pn];
+		page = gpage->page;
+
+		dev_dbg(geth->dev, "fill entry %d page ref count %d add %d refs\n",
+			pn, page_ref_count(page), 1 << fpp_order);
+
+		if (page_ref_count(page) > 1) {
+			unsigned int fl = (pn - epn) & m_pn;
+
+			if (fl > 64 >> fpp_order)
+				break;
+
+			page = geth_freeq_alloc_map_page(geth, pn);
+			if (!page)
+				break;
+		}
+
+		/* Add one reference per fragment in the page */
+		page_ref_add(page, 1 << fpp_order);
+		count += 1 << fpp_order;
+		pn++;
+		pn &= m_pn;
+	}
+
+	writew(pn << fpp_order, geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
+
+	spin_unlock_irqrestore(&geth->freeq_lock, flags);
+
+	return count;
+}
+
+static int geth_setup_freeq(struct gemini_ethernet *geth)
+{
+	unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
+	unsigned int frag_len = 1 << geth->freeq_frag_order;
+	unsigned int len = 1 << geth->freeq_order;
+	unsigned int pages = len >> fpp_order;
+	union queue_threshold qt;
+	union dma_skb_size skbsz;
+	unsigned int filled;
+	unsigned int pn;
+
+	geth->freeq_ring = dma_alloc_coherent(geth->dev,
+		sizeof(*geth->freeq_ring) << geth->freeq_order,
+		&geth->freeq_dma_base, GFP_KERNEL);
+	if (!geth->freeq_ring)
+		return -ENOMEM;
+	if (geth->freeq_dma_base & ~DMA_Q_BASE_MASK) {
+		dev_warn(geth->dev, "queue ring base it not aligned\n");
+		goto err_freeq;
+	}
+
+	/* Allocate a mapping to page look-up index */
+	geth->freeq_pages = kzalloc(pages * sizeof(*geth->freeq_pages),
+				   GFP_KERNEL);
+	if (!geth->freeq_pages)
+		goto err_freeq;
+	geth->num_freeq_pages = pages;
+
+	dev_info(geth->dev, "allocate %d pages for queue\n", pages);
+	for (pn = 0; pn < pages; pn++)
+		if (!geth_freeq_alloc_map_page(geth, pn))
+			goto err_freeq_alloc;
+
+	filled = geth_fill_freeq(geth, false);
+	if (!filled)
+		goto err_freeq_alloc;
+
+	qt.bits32 = readl(geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
+	qt.bits.swfq_empty = 32;
+	writel(qt.bits32, geth->base + GLOBAL_QUEUE_THRESHOLD_REG);
+
+	skbsz.bits.sw_skb_size = 1 << geth->freeq_frag_order;
+	writel(skbsz.bits32, geth->base + GLOBAL_DMA_SKB_SIZE_REG);
+	writel(geth->freeq_dma_base | geth->freeq_order,
+	       geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
+
+	return 0;
+
+err_freeq_alloc:
+	while (pn > 0) {
+		struct gmac_queue_page *gpage;
+		dma_addr_t mapping;
+
+		--pn;
+		mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
+		dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
+		gpage = &geth->freeq_pages[pn];
+		put_page(gpage->page);
+	}
+
+	kfree(geth->freeq_pages);
+err_freeq:
+	dma_free_coherent(geth->dev,
+			  sizeof(*geth->freeq_ring) << geth->freeq_order,
+			  geth->freeq_ring, geth->freeq_dma_base);
+	geth->freeq_ring = NULL;
+	return -ENOMEM;
+}
+
+/**
+ * geth_cleanup_freeq() - cleanup the DMA mappings and free the queue
+ * @geth: the Gemini global ethernet state
+ */
+static void geth_cleanup_freeq(struct gemini_ethernet *geth)
+{
+	unsigned int fpp_order = PAGE_SHIFT - geth->freeq_frag_order;
+	unsigned int frag_len = 1 << geth->freeq_frag_order;
+	unsigned int len = 1 << geth->freeq_order;
+	unsigned int pages = len >> fpp_order;
+	unsigned int pn;
+
+	writew(readw(geth->base + GLOBAL_SWFQ_RWPTR_REG),
+	       geth->base + GLOBAL_SWFQ_RWPTR_REG + 2);
+	writel(0, geth->base + GLOBAL_SW_FREEQ_BASE_SIZE_REG);
+
+	for (pn = 0; pn < pages; pn++) {
+		struct gmac_queue_page *gpage;
+		dma_addr_t mapping;
+
+		mapping = geth->freeq_ring[pn << fpp_order].word2.buf_adr;
+		dma_unmap_single(geth->dev, mapping, frag_len, DMA_FROM_DEVICE);
+
+		gpage = &geth->freeq_pages[pn];
+		while (page_ref_count(gpage->page) > 0)
+			put_page(gpage->page);
+	}
+
+	kfree(geth->freeq_pages);
+
+	dma_free_coherent(geth->dev,
+			  sizeof(*geth->freeq_ring) << geth->freeq_order,
+			  geth->freeq_ring, geth->freeq_dma_base);
+}
+
+/**
+ * geth_resize_freeq() - resize the software queue depth
+ * @port: the port requesting the change
+ *
+ * This gets called at least once during probe() so the device queue gets
+ * "resized" from the hardware defaults. Since both ports/net devices share
+ * the same hardware queue, some synchronization between the ports is
+ * needed.
+ */
+static int geth_resize_freeq(struct gemini_ethernet_port *port)
+{
+	struct gemini_ethernet *geth = port->geth;
+	struct net_device *netdev = port->netdev;
+	struct gemini_ethernet_port *other_port;
+	struct net_device *other_netdev;
+	unsigned int new_size = 0;
+	unsigned int new_order;
+	unsigned long flags;
+	u32 en;
+	int ret;
+
+	if (netdev->dev_id == 0)