net: socionext: Add Synquacer NetSec driver

This driver adds support for Socionext "netsec" IP Gigabit
Ethernet + PHY IP used in the Synquacer SC2A11 SoC.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/socionext/Kconfig

@@ -19,4 +19,16 @@ config SNI_AVE
 	  Driver for gigabit ethernet MACs, called AVE, in the
 	  Socionext UniPhier family.
 
+config SNI_NETSEC
+	tristate "Socionext NETSEC ethernet support"
+	depends on (ARCH_SYNQUACER || COMPILE_TEST) && OF
+	select PHYLIB
+	select MII
+	---help---
+	  Enable to add support for the SocioNext NetSec Gigabit Ethernet
+	  controller + PHY, as found on the Synquacer SC2A11 SoC
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called netsec.  If unsure, say N.
+
 endif #NET_VENDOR_SOCIONEXT

drivers/net/ethernet/socionext/Makefile

@@ -3,3 +3,4 @@
 # Makefile for all ethernet ip drivers on Socionext platforms
 #
 obj-$(CONFIG_SNI_AVE) += sni_ave.o
+obj-$(CONFIG_SNI_NETSEC) += netsec.o

drivers/net/ethernet/socionext/netsec.c

+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/types.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/acpi.h>
+#include <linux/of_mdio.h>
+#include <linux/etherdevice.h>
+#include <linux/interrupt.h>
+
+#include <net/tcp.h>
+#include <net/ip6_checksum.h>
+
+#define NETSEC_REG_SOFT_RST			0x104
+#define NETSEC_REG_COM_INIT			0x120
+
+#define NETSEC_REG_TOP_STATUS			0x200
+#define NETSEC_IRQ_RX				BIT(1)
+#define NETSEC_IRQ_TX				BIT(0)
+
+#define NETSEC_REG_TOP_INTEN			0x204
+#define NETSEC_REG_INTEN_SET			0x234
+#define NETSEC_REG_INTEN_CLR			0x238
+
+#define NETSEC_REG_NRM_TX_STATUS		0x400
+#define NETSEC_REG_NRM_TX_INTEN			0x404
+#define NETSEC_REG_NRM_TX_INTEN_SET		0x428
+#define NETSEC_REG_NRM_TX_INTEN_CLR		0x42c
+#define NRM_TX_ST_NTOWNR	BIT(17)
+#define NRM_TX_ST_TR_ERR	BIT(16)
+#define NRM_TX_ST_TXDONE	BIT(15)
+#define NRM_TX_ST_TMREXP	BIT(14)
+
+#define NETSEC_REG_NRM_RX_STATUS		0x440
+#define NETSEC_REG_NRM_RX_INTEN			0x444
+#define NETSEC_REG_NRM_RX_INTEN_SET		0x468
+#define NETSEC_REG_NRM_RX_INTEN_CLR		0x46c
+#define NRM_RX_ST_RC_ERR	BIT(16)
+#define NRM_RX_ST_PKTCNT	BIT(15)
+#define NRM_RX_ST_TMREXP	BIT(14)
+
+#define NETSEC_REG_PKT_CMD_BUF			0xd0
+
+#define NETSEC_REG_CLK_EN			0x100
+
+#define NETSEC_REG_PKT_CTRL			0x140
+
+#define NETSEC_REG_DMA_TMR_CTRL			0x20c
+#define NETSEC_REG_F_TAIKI_MC_VER		0x22c
+#define NETSEC_REG_F_TAIKI_VER			0x230
+#define NETSEC_REG_DMA_HM_CTRL			0x214
+#define NETSEC_REG_DMA_MH_CTRL			0x220
+#define NETSEC_REG_ADDR_DIS_CORE		0x218
+#define NETSEC_REG_DMAC_HM_CMD_BUF		0x210
+#define NETSEC_REG_DMAC_MH_CMD_BUF		0x21c
+
+#define NETSEC_REG_NRM_TX_PKTCNT		0x410
+
+#define NETSEC_REG_NRM_TX_DONE_PKTCNT		0x414
+#define NETSEC_REG_NRM_TX_DONE_TXINT_PKTCNT	0x418
+
+#define NETSEC_REG_NRM_TX_TMR			0x41c
+
+#define NETSEC_REG_NRM_RX_PKTCNT		0x454
+#define NETSEC_REG_NRM_RX_RXINT_PKTCNT		0x458
+#define NETSEC_REG_NRM_TX_TXINT_TMR		0x420
+#define NETSEC_REG_NRM_RX_RXINT_TMR		0x460
+
+#define NETSEC_REG_NRM_RX_TMR			0x45c
+
+#define NETSEC_REG_NRM_TX_DESC_START_UP		0x434
+#define NETSEC_REG_NRM_TX_DESC_START_LW		0x408
+#define NETSEC_REG_NRM_RX_DESC_START_UP		0x474
+#define NETSEC_REG_NRM_RX_DESC_START_LW		0x448
+
+#define NETSEC_REG_NRM_TX_CONFIG		0x430
+#define NETSEC_REG_NRM_RX_CONFIG		0x470
+
+#define MAC_REG_STATUS				0x1024
+#define MAC_REG_DATA				0x11c0
+#define MAC_REG_CMD				0x11c4
+#define MAC_REG_FLOW_TH				0x11cc
+#define MAC_REG_INTF_SEL			0x11d4
+#define MAC_REG_DESC_INIT			0x11fc
+#define MAC_REG_DESC_SOFT_RST			0x1204
+#define NETSEC_REG_MODE_TRANS_COMP_STATUS	0x500
+
+#define GMAC_REG_MCR				0x0000
+#define GMAC_REG_MFFR				0x0004
+#define GMAC_REG_GAR				0x0010
+#define GMAC_REG_GDR				0x0014
+#define GMAC_REG_FCR				0x0018
+#define GMAC_REG_BMR				0x1000
+#define GMAC_REG_RDLAR				0x100c
+#define GMAC_REG_TDLAR				0x1010
+#define GMAC_REG_OMR				0x1018
+
+#define MHZ(n)		((n) * 1000 * 1000)
+
+#define NETSEC_TX_SHIFT_OWN_FIELD		31
+#define NETSEC_TX_SHIFT_LD_FIELD		30
+#define NETSEC_TX_SHIFT_DRID_FIELD		24
+#define NETSEC_TX_SHIFT_PT_FIELD		21
+#define NETSEC_TX_SHIFT_TDRID_FIELD		16
+#define NETSEC_TX_SHIFT_CC_FIELD		15
+#define NETSEC_TX_SHIFT_FS_FIELD		9
+#define NETSEC_TX_LAST				8
+#define NETSEC_TX_SHIFT_CO			7
+#define NETSEC_TX_SHIFT_SO			6
+#define NETSEC_TX_SHIFT_TRS_FIELD		4
+
+#define NETSEC_RX_PKT_OWN_FIELD			31
+#define NETSEC_RX_PKT_LD_FIELD			30
+#define NETSEC_RX_PKT_SDRID_FIELD		24
+#define NETSEC_RX_PKT_FR_FIELD			23
+#define NETSEC_RX_PKT_ER_FIELD			21
+#define NETSEC_RX_PKT_ERR_FIELD			16
+#define NETSEC_RX_PKT_TDRID_FIELD		12
+#define NETSEC_RX_PKT_FS_FIELD			9
+#define NETSEC_RX_PKT_LS_FIELD			8
+#define NETSEC_RX_PKT_CO_FIELD			6
+
+#define NETSEC_RX_PKT_ERR_MASK			3
+
+#define NETSEC_MAX_TX_PKT_LEN			1518
+#define NETSEC_MAX_TX_JUMBO_PKT_LEN		9018
+
+#define NETSEC_RING_GMAC			15
+#define NETSEC_RING_MAX				2
+
+#define NETSEC_TCP_SEG_LEN_MAX			1460
+#define NETSEC_TCP_JUMBO_SEG_LEN_MAX		8960
+
+#define NETSEC_RX_CKSUM_NOTAVAIL		0
+#define NETSEC_RX_CKSUM_OK			1
+#define NETSEC_RX_CKSUM_NG			2
+
+#define NETSEC_TOP_IRQ_REG_CODE_LOAD_END	BIT(20)
+#define NETSEC_IRQ_TRANSITION_COMPLETE		BIT(4)
+
+#define NETSEC_MODE_TRANS_COMP_IRQ_N2T		BIT(20)
+#define NETSEC_MODE_TRANS_COMP_IRQ_T2N		BIT(19)
+
+#define NETSEC_INT_PKTCNT_MAX			2047
+
+#define NETSEC_FLOW_START_TH_MAX		95
+#define NETSEC_FLOW_STOP_TH_MAX			95
+#define NETSEC_FLOW_PAUSE_TIME_MIN		5
+
+#define NETSEC_CLK_EN_REG_DOM_ALL		0x3f
+
+#define NETSEC_PKT_CTRL_REG_MODE_NRM		BIT(28)
+#define NETSEC_PKT_CTRL_REG_EN_JUMBO		BIT(27)
+#define NETSEC_PKT_CTRL_REG_LOG_CHKSUM_ER	BIT(3)
+#define NETSEC_PKT_CTRL_REG_LOG_HD_INCOMPLETE	BIT(2)
+#define NETSEC_PKT_CTRL_REG_LOG_HD_ER		BIT(1)
+#define NETSEC_PKT_CTRL_REG_DRP_NO_MATCH	BIT(0)
+
+#define NETSEC_CLK_EN_REG_DOM_G			BIT(5)
+#define NETSEC_CLK_EN_REG_DOM_C			BIT(1)
+#define NETSEC_CLK_EN_REG_DOM_D			BIT(0)
+
+#define NETSEC_COM_INIT_REG_DB			BIT(2)
+#define NETSEC_COM_INIT_REG_CLS			BIT(1)
+#define NETSEC_COM_INIT_REG_ALL			(NETSEC_COM_INIT_REG_CLS | \
+						 NETSEC_COM_INIT_REG_DB)
+
+#define NETSEC_SOFT_RST_REG_RESET		0
+#define NETSEC_SOFT_RST_REG_RUN			BIT(31)
+
+#define NETSEC_DMA_CTRL_REG_STOP		1
+#define MH_CTRL__MODE_TRANS			BIT(20)
+
+#define NETSEC_GMAC_CMD_ST_READ			0
+#define NETSEC_GMAC_CMD_ST_WRITE		BIT(28)
+#define NETSEC_GMAC_CMD_ST_BUSY			BIT(31)
+
+#define NETSEC_GMAC_BMR_REG_COMMON		0x00412080
+#define NETSEC_GMAC_BMR_REG_RESET		0x00020181
+#define NETSEC_GMAC_BMR_REG_SWR			0x00000001
+
+#define NETSEC_GMAC_OMR_REG_ST			BIT(13)
+#define NETSEC_GMAC_OMR_REG_SR			BIT(1)
+
+#define NETSEC_GMAC_MCR_REG_IBN			BIT(30)
+#define NETSEC_GMAC_MCR_REG_CST			BIT(25)
+#define NETSEC_GMAC_MCR_REG_JE			BIT(20)
+#define NETSEC_MCR_PS				BIT(15)
+#define NETSEC_GMAC_MCR_REG_FES			BIT(14)
+#define NETSEC_GMAC_MCR_REG_FULL_DUPLEX_COMMON	0x0000280c
+#define NETSEC_GMAC_MCR_REG_HALF_DUPLEX_COMMON	0x0001a00c
+
+#define NETSEC_FCR_RFE				BIT(2)
+#define NETSEC_FCR_TFE				BIT(1)
+
+#define NETSEC_GMAC_GAR_REG_GW			BIT(1)
+#define NETSEC_GMAC_GAR_REG_GB			BIT(0)
+
+#define NETSEC_GMAC_GAR_REG_SHIFT_PA		11
+#define NETSEC_GMAC_GAR_REG_SHIFT_GR		6
+#define GMAC_REG_SHIFT_CR_GAR			2
+
+#define NETSEC_GMAC_GAR_REG_CR_25_35_MHZ	2
+#define NETSEC_GMAC_GAR_REG_CR_35_60_MHZ	3
+#define NETSEC_GMAC_GAR_REG_CR_60_100_MHZ	0
+#define NETSEC_GMAC_GAR_REG_CR_100_150_MHZ	1
+#define NETSEC_GMAC_GAR_REG_CR_150_250_MHZ	4
+#define NETSEC_GMAC_GAR_REG_CR_250_300_MHZ	5
+
+#define NETSEC_GMAC_RDLAR_REG_COMMON		0x18000
+#define NETSEC_GMAC_TDLAR_REG_COMMON		0x1c000
+
+#define NETSEC_REG_NETSEC_VER_F_TAIKI		0x50000
+
+#define NETSEC_REG_DESC_RING_CONFIG_CFG_UP	BIT(31)
+#define NETSEC_REG_DESC_RING_CONFIG_CH_RST	BIT(30)
+#define NETSEC_REG_DESC_TMR_MODE		4
+#define NETSEC_REG_DESC_ENDIAN			0
+
+#define NETSEC_MAC_DESC_SOFT_RST_SOFT_RST	1
+#define NETSEC_MAC_DESC_INIT_REG_INIT		1
+
+#define NETSEC_EEPROM_MAC_ADDRESS		0x00
+#define NETSEC_EEPROM_HM_ME_ADDRESS_H		0x08
+#define NETSEC_EEPROM_HM_ME_ADDRESS_L		0x0C
+#define NETSEC_EEPROM_HM_ME_SIZE		0x10
+#define NETSEC_EEPROM_MH_ME_ADDRESS_H		0x14
+#define NETSEC_EEPROM_MH_ME_ADDRESS_L		0x18
+#define NETSEC_EEPROM_MH_ME_SIZE		0x1C
+#define NETSEC_EEPROM_PKT_ME_ADDRESS		0x20
+#define NETSEC_EEPROM_PKT_ME_SIZE		0x24
+
+#define DESC_NUM	128
+#define NAPI_BUDGET	(DESC_NUM / 2)
+
+#define DESC_SZ	sizeof(struct netsec_de)
+
+#define NETSEC_F_NETSEC_VER_MAJOR_NUM(x)	((x) & 0xffff0000)
+
+enum ring_id {
+	NETSEC_RING_TX = 0,
+	NETSEC_RING_RX
+};
+
+struct netsec_desc {
+	struct sk_buff *skb;
+	dma_addr_t dma_addr;
+	void *addr;
+	u16 len;
+};
+
+struct netsec_desc_ring {
+	phys_addr_t desc_phys;
+	struct netsec_desc *desc;
+	void *vaddr;
+	u16 pkt_cnt;
+	u16 head, tail;
+};
+
+struct netsec_priv {
+	struct netsec_desc_ring desc_ring[NETSEC_RING_MAX];
+	struct ethtool_coalesce et_coalesce;
+	spinlock_t reglock; /* protect reg access */
+	struct napi_struct napi;
+	phy_interface_t phy_interface;
+	struct net_device *ndev;
+	struct device_node *phy_np;
+	struct phy_device *phydev;
+	struct mii_bus *mii_bus;
+	void __iomem *ioaddr;
+	void __iomem *eeprom_base;
+	struct device *dev;
+	struct clk *clk;
+	u32 msg_enable;
+	u32 freq;
+	bool rx_cksum_offload_flag;
+};
+
+struct netsec_de { /* Netsec Descriptor layout */
+	u32 attr;
+	u32 data_buf_addr_up;
+	u32 data_buf_addr_lw;
+	u32 buf_len_info;
+};
+
+struct netsec_tx_pkt_ctrl {
+	u16 tcp_seg_len;
+	bool tcp_seg_offload_flag;
+	bool cksum_offload_flag;
+};
+
+struct netsec_rx_pkt_info {
+	int rx_cksum_result;
+	int err_code;
+	bool err_flag;
+};
+
+static void netsec_write(struct netsec_priv *priv, u32 reg_addr, u32 val)
+{
+	writel(val, priv->ioaddr + reg_addr);
+}
+
+static u32 netsec_read(struct netsec_priv *priv, u32 reg_addr)
+{
+	return readl(priv->ioaddr + reg_addr);
+}
+
+/************* MDIO BUS OPS FOLLOW *************/
+
+#define TIMEOUT_SPINS_MAC		1000
+#define TIMEOUT_SECONDARY_MS_MAC	100
+
+static u32 netsec_clk_type(u32 freq)
+{
+	if (freq < MHZ(35))
+		return NETSEC_GMAC_GAR_REG_CR_25_35_MHZ;
+	if (freq < MHZ(60))
+		return NETSEC_GMAC_GAR_REG_CR_35_60_MHZ;
+	if (freq < MHZ(100))
+		return NETSEC_GMAC_GAR_REG_CR_60_100_MHZ;
+	if (freq < MHZ(150))
+		return NETSEC_GMAC_GAR_REG_CR_100_150_MHZ;
+	if (freq < MHZ(250))
+		return NETSEC_GMAC_GAR_REG_CR_150_250_MHZ;
+
+	return NETSEC_GMAC_GAR_REG_CR_250_300_MHZ;
+}
+
+static int netsec_wait_while_busy(struct netsec_priv *priv, u32 addr, u32 mask)
+{
+	u32 timeout = TIMEOUT_SPINS_MAC;
+
+	while (--timeout && netsec_read(priv, addr) & mask)
+		cpu_relax();
+	if (timeout)
+		return 0;
+
+	timeout = TIMEOUT_SECONDARY_MS_MAC;
+	while (--timeout && netsec_read(priv, addr) & mask)
+		usleep_range(1000, 2000);
+
+	if (timeout)
+		return 0;
+
+	netdev_WARN(priv->ndev, "%s: timeout\n", __func__);
+
+	return -ETIMEDOUT;
+}
+
+static int netsec_mac_write(struct netsec_priv *priv, u32 addr, u32 value)
+{
+	netsec_write(priv, MAC_REG_DATA, value);
+	netsec_write(priv, MAC_REG_CMD, addr | NETSEC_GMAC_CMD_ST_WRITE);
+	return netsec_wait_while_busy(priv,
+				      MAC_REG_CMD, NETSEC_GMAC_CMD_ST_BUSY);
+}
+
+static int netsec_mac_read(struct netsec_priv *priv, u32 addr, u32 *read)
+{
+	int ret;
+
+	netsec_write(priv, MAC_REG_CMD, addr | NETSEC_GMAC_CMD_ST_READ);
+	ret = netsec_wait_while_busy(priv,
+				     MAC_REG_CMD, NETSEC_GMAC_CMD_ST_BUSY);
+	if (ret)
+		return ret;
+
+	*read = netsec_read(priv, MAC_REG_DATA);
+
+	return 0;
+}
+
+static int netsec_mac_wait_while_busy(struct netsec_priv *priv,
+				      u32 addr, u32 mask)
+{
+	u32 timeout = TIMEOUT_SPINS_MAC;
+	int ret, data;
+
+	do {
+		ret = netsec_mac_read(priv, addr, &data);
+		if (ret)
+			break;
+		cpu_relax();
+	} while (--timeout && (data & mask));
+
+	if (timeout)
+		return 0;
+
+	timeout = TIMEOUT_SECONDARY_MS_MAC;
+	do {
+		usleep_range(1000, 2000);
+
+		ret = netsec_mac_read(priv, addr, &data);
+		if (ret)
+			break;
+		cpu_relax();
+	} while (--timeout && (data & mask));
+
+	if (timeout && !ret)
+		return 0;
+
+	netdev_WARN(priv->ndev, "%s: timeout\n", __func__);
+
+	return -ETIMEDOUT;
+}
+
+static int netsec_mac_update_to_phy_state(struct netsec_priv *priv)
+{
+	struct phy_device *phydev = priv->ndev->phydev;
+	u32 value = 0;
+
+	value = phydev->duplex ? NETSEC_GMAC_MCR_REG_FULL_DUPLEX_COMMON :
+				 NETSEC_GMAC_MCR_REG_HALF_DUPLEX_COMMON;
+
+	if (phydev->speed != SPEED_1000)
+		value |= NETSEC_MCR_PS;
+
+	if (priv->phy_interface != PHY_INTERFACE_MODE_GMII &&
+	    phydev->speed == SPEED_100)
+		value |= NETSEC_GMAC_MCR_REG_FES;
+
+	value |= NETSEC_GMAC_MCR_REG_CST | NETSEC_GMAC_MCR_REG_JE;
+
+	if (phy_interface_mode_is_rgmii(priv->phy_interface))
+		value |= NETSEC_GMAC_MCR_REG_IBN;
+
+	if (netsec_mac_write(priv, GMAC_REG_MCR, value))
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int netsec_phy_write(struct mii_bus *bus,
+			    int phy_addr, int reg, u16 val)
+{
+	struct netsec_priv *priv = bus->priv;
+
+	if (netsec_mac_write(priv, GMAC_REG_GDR, val))
+		return -ETIMEDOUT;
+	if (netsec_mac_write(priv, GMAC_REG_GAR,
+			     phy_addr << NETSEC_GMAC_GAR_REG_SHIFT_PA |
+			     reg << NETSEC_GMAC_GAR_REG_SHIFT_GR |
+			     NETSEC_GMAC_GAR_REG_GW | NETSEC_GMAC_GAR_REG_GB |
+			     (netsec_clk_type(priv->freq) <<
+			      GMAC_REG_SHIFT_CR_GAR)))
+		return -ETIMEDOUT;
+
+	return netsec_mac_wait_while_busy(priv, GMAC_REG_GAR,
+					  NETSEC_GMAC_GAR_REG_GB);
+}
+
+static int netsec_phy_read(struct mii_bus *bus, int phy_addr, int reg_addr)
+{
+	struct netsec_priv *priv = bus->priv;
+	u32 data;
+	int ret;
+
+	if (netsec_mac_write(priv, GMAC_REG_GAR, NETSEC_GMAC_GAR_REG_GB |
+			     phy_addr << NETSEC_GMAC_GAR_REG_SHIFT_PA |
+			     reg_addr << NETSEC_GMAC_GAR_REG_SHIFT_GR |
+			     (netsec_clk_type(priv->freq) <<
+			      GMAC_REG_SHIFT_CR_GAR)))
+		return -ETIMEDOUT;
+
+	ret = netsec_mac_wait_while_busy(priv, GMAC_REG_GAR,
+					 NETSEC_GMAC_GAR_REG_GB);
+	if (ret)
+		return ret;
+
+	ret = netsec_mac_read(priv, GMAC_REG_GDR, &data);
+	if (ret)
+		return ret;
+
+	return data;
+}
+
+/************* ETHTOOL_OPS FOLLOW *************/
+
+static void netsec_et_get_drvinfo(struct net_device *net_device,
+				  struct ethtool_drvinfo *info)
+{
+	strlcpy(info->driver, "netsec", sizeof(info->driver));
+	strlcpy(info->bus_info, dev_name(net_device->dev.parent),
+		sizeof(info->bus_info));
+}
+
+static int netsec_et_get_coalesce(struct net_device *net_device,
+				  struct ethtool_coalesce *et_coalesce)
+{
+	struct netsec_priv *priv = netdev_priv(net_device);
+
+	*et_coalesce = priv->et_coalesce;
+
+	return 0;
+}
+
+static int netsec_et_set_coalesce(struct net_device *net_device,
+				  struct ethtool_coalesce *et_coalesce)
+{
+	struct netsec_priv *priv = netdev_priv(net_device);
+
+	priv->et_coalesce = *et_coalesce;
+
+	if (priv->et_coalesce.tx_coalesce_usecs < 50)
+		priv->et_coalesce.tx_coalesce_usecs = 50;
+	if (priv->et_coalesce.tx_max_coalesced_frames < 1)
+		priv->et_coalesce.tx_max_coalesced_frames = 1;
+
+	netsec_write(priv, NETSEC_REG_NRM_TX_DONE_TXINT_PKTCNT,
+		     priv->et_coalesce.tx_max_coalesced_frames);
+	netsec_write(priv, NETSEC_REG_NRM_TX_TXINT_TMR,
+		     priv->et_coalesce.tx_coalesce_usecs);
+	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_SET, NRM_TX_ST_TXDONE);
+	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_SET, NRM_TX_ST_TMREXP);
+
+	if (priv->et_coalesce.rx_coalesce_usecs < 50)
+		priv->et_coalesce.rx_coalesce_usecs = 50;
+	if (priv->et_coalesce.rx_max_coalesced_frames < 1)
+		priv->et_coalesce.rx_max_coalesced_frames = 1;
+
+	netsec_write(priv, NETSEC_REG_NRM_RX_RXINT_PKTCNT,
+		     priv->et_coalesce.rx_max_coalesced_frames);
+	netsec_write(priv, NETSEC_REG_NRM_RX_RXINT_TMR,
+		     priv->et_coalesce.rx_coalesce_usecs);
+	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_SET, NRM_RX_ST_PKTCNT);
+	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_SET, NRM_RX_ST_TMREXP);
+
+	return 0;
+}
+
+static u32 netsec_et_get_msglevel(struct net_device *dev)
+{
+	struct netsec_priv *priv = netdev_priv(dev);
+
+	return priv->msg_enable;
+}
+
+static void netsec_et_set_msglevel(struct net_device *dev, u32 datum)
+{
+	struct netsec_priv *priv = netdev_priv(dev);
+
+	priv->msg_enable = datum;
+}
+
+static const struct ethtool_ops netsec_ethtool_ops = {
+	.get_drvinfo		= netsec_et_get_drvinfo,
+	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
+	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
+	.get_link		= ethtool_op_get_link,
+	.get_coalesce		= netsec_et_get_coalesce,
+	.set_coalesce		= netsec_et_set_coalesce,
+	.get_msglevel		= netsec_et_get_msglevel,
+	.set_msglevel		= netsec_et_set_msglevel,
+};
+
+/************* NETDEV_OPS FOLLOW *************/
+
+static struct sk_buff *netsec_alloc_skb(struct netsec_priv *priv,
+					struct netsec_desc *desc)
+{
+	struct sk_buff *skb;
+
+	if (device_get_dma_attr(priv->dev) == DEV_DMA_COHERENT) {
+		skb = netdev_alloc_skb_ip_align(priv->ndev, desc->len);
+	} else {
+		desc->len = L1_CACHE_ALIGN(desc->len);
+		skb = netdev_alloc_skb(priv->ndev, desc->len);
+	}
+	if (!skb)
+		return NULL;
+
+	desc->addr = skb->data;
+	desc->dma_addr = dma_map_single(priv->dev, desc->addr, desc->len,
+					DMA_FROM_DEVICE);
+	if (dma_mapping_error(priv->dev, desc->dma_addr)) {
+		dev_kfree_skb_any(skb);
+		return NULL;
+	}
+	return skb;
+}
+
+static void netsec_set_rx_de(struct netsec_priv *priv,
+			     struct netsec_desc_ring *dring, u16 idx,
+			     const struct netsec_desc *desc,
+			     struct sk_buff *skb)
+{
+	struct netsec_de *de = dring->vaddr + DESC_SZ * idx;
+	u32 attr = (1 << NETSEC_RX_PKT_OWN_FIELD) |
+		   (1 << NETSEC_RX_PKT_FS_FIELD) |
+		   (1 << NETSEC_RX_PKT_LS_FIELD);
+
+	if (idx == DESC_NUM - 1)
+		attr |= (1 << NETSEC_RX_PKT_LD_FIELD);
+
+	de->data_buf_addr_up = upper_32_bits(desc->dma_addr);
+	de->data_buf_addr_lw = lower_32_bits(desc->dma_addr);
+	de->buf_len_info = desc->len;
+	de->attr = attr;
+	dma_wmb();
+
+	dring->desc[idx].dma_addr = desc->dma_addr;
+	dring->desc[idx].addr = desc->addr;
+	dring->desc[idx].len = desc->len;
+	dring->desc[idx].skb = skb;
+}
+
+static struct sk_buff *netsec_get_rx_de(struct netsec_priv *priv,
+					struct netsec_desc_ring *dring,
+					u16 idx,
+					struct netsec_rx_pkt_info *rxpi,
+					struct netsec_desc *desc, u16 *len)
+{
+	struct netsec_de de = {};
+
+	memcpy(&de, dring->vaddr + DESC_SZ * idx, DESC_SZ);
+
+	*len = de.buf_len_info >> 16;
+
+	rxpi->err_flag = (de.attr >> NETSEC_RX_PKT_ER_FIELD) & 1;
+	rxpi->rx_cksum_result = (de.attr >> NETSEC_RX_PKT_CO_FIELD) & 3;
+	rxpi->err_code = (de.attr >> NETSEC_RX_PKT_ERR_FIELD) &
+							NETSEC_RX_PKT_ERR_MASK;
+	*desc = dring->desc[idx];
+	return desc->skb;
+}
+
+static struct sk_buff *netsec_get_rx_pkt_data(struct netsec_priv *priv,
+					      struct netsec_rx_pkt_info *rxpi,
+					      struct netsec_desc *desc,
+					      u16 *len)
+{
+	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
+	struct sk_buff *tmp_skb, *skb = NULL;
+	struct netsec_desc td;
+	int tail;
+
+	*rxpi = (struct netsec_rx_pkt_info){};
+
+	td.len = priv->ndev->mtu + 22;
+
+	tmp_skb = netsec_alloc_skb(priv, &td);
+
+	dma_rmb();
+
+	tail = dring->tail;
+
+	if (!tmp_skb) {
+		netsec_set_rx_de(priv, dring, tail, &dring->desc[tail],
+				 dring->desc[tail].skb);
+	} else {
+		skb = netsec_get_rx_de(priv, dring, tail, rxpi, desc, len);
+		netsec_set_rx_de(priv, dring, tail, &td, tmp_skb);
+	}
+
+	/* move tail ahead */
+	dring->tail = (dring->tail + 1) % DESC_NUM;
+
+	dring->pkt_cnt--;
+
+	return skb;
+}
+
+static int netsec_clean_tx_dring(struct netsec_priv *priv, int budget)
+{
+	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
+	unsigned int pkts, bytes;
+
+	dring->pkt_cnt += netsec_read(priv, NETSEC_REG_NRM_TX_DONE_PKTCNT);
+
+	if (dring->pkt_cnt < budget)
+		budget = dring->pkt_cnt;
+
+	pkts = 0;
+	bytes = 0;
+
+	while (pkts < budget) {
+		struct netsec_desc *desc;
+		struct netsec_de *entry;
+		int tail, eop;
+
+		tail = dring->tail;
+
+		/* move tail ahead */
+		dring->tail = (tail + 1) % DESC_NUM;
+
+		desc = &dring->desc[tail];
+		entry = dring->vaddr + DESC_SZ * tail;
+
+		eop = (entry->attr >> NETSEC_TX_LAST) & 1;
+
+		dma_unmap_single(priv->dev, desc->dma_addr, desc->len,
+				 DMA_TO_DEVICE);
+		if (eop) {
+			pkts++;
+			bytes += desc->skb->len;
+			dev_kfree_skb(desc->skb);
+		}
+		*desc = (struct netsec_desc){};
+	}
+	dring->pkt_cnt -= budget;
+
+	priv->ndev->stats.tx_packets += budget;
+	priv->ndev->stats.tx_bytes += bytes;
+
+	netdev_completed_queue(priv->ndev, budget, bytes);
+
+	return budget;
+}
+
+static int netsec_process_tx(struct netsec_priv *priv, int budget)
+{
+	struct net_device *ndev = priv->ndev;
+	int new, done = 0;
+
+	do {
+		new = netsec_clean_tx_dring(priv, budget);
+		done += new;
+		budget -= new;
+	} while (new);
+
+	if (done && netif_queue_stopped(ndev))
+		netif_wake_queue(ndev);
+
+	return done;
+}
+
+static int netsec_process_rx(struct netsec_priv *priv, int budget)
+{
+	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
+	struct net_device *ndev = priv->ndev;
+	struct netsec_rx_pkt_info rx_info;
+	int done = 0, rx_num = 0;
+	struct netsec_desc desc;
+	struct sk_buff *skb;
+	u16 len;
+
+	while (done < budget) {
+		if (!rx_num) {
+			rx_num = netsec_read(priv, NETSEC_REG_NRM_RX_PKTCNT);
+			dring->pkt_cnt += rx_num;
+
+			/* move head 'rx_num' */
+			dring->head = (dring->head + rx_num) % DESC_NUM;
+
+			rx_num = dring->pkt_cnt;
+			if (!rx_num)
+				break;
+		}
+		done++;
+		rx_num--;
+		skb = netsec_get_rx_pkt_data(priv, &rx_info, &desc, &len);
+		if (unlikely(!skb) || rx_info.err_flag) {
+			netif_err(priv, drv, priv->ndev,
+				  "%s: rx fail err(%d)\n",
+				  __func__, rx_info.err_code);
+			ndev->stats.rx_dropped++;
+			continue;
+		}
+
+		dma_unmap_single(priv->dev, desc.dma_addr, desc.len,
+				 DMA_FROM_DEVICE);
+		skb_put(skb, len);
+		skb->protocol = eth_type_trans(skb, priv->ndev);
+
+		if (priv->rx_cksum_offload_flag &&
+		    rx_info.rx_cksum_result == NETSEC_RX_CKSUM_OK)
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+		if (napi_gro_receive(&priv->napi, skb) != GRO_DROP) {
+			ndev->stats.rx_packets++;
+			ndev->stats.rx_bytes += len;
+		}
+	}
+
+	return done;
+}
+
+static int netsec_napi_poll(struct napi_struct *napi, int budget)
+{
+	struct netsec_priv *priv;
+	struct net_device *ndev;
+	int tx, rx, done, todo;
+
+	priv = container_of(napi, struct netsec_priv, napi);
+	ndev = priv->ndev;
+
+	todo = budget;
+	do {
+		if (!todo)
+			break;
+
+		tx = netsec_process_tx(priv, todo);
+		todo -= tx;
+
+		if (!todo)
+			break;
+
+		rx = netsec_process_rx(priv, todo);
+		todo -= rx;
+	} while (rx || tx);
+
+	done = budget - todo;
+
+	if (done < budget && napi_complete_done(napi, done)) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&priv->reglock, flags);
+		netsec_write(priv, NETSEC_REG_INTEN_SET,
+			     NETSEC_IRQ_RX | NETSEC_IRQ_TX);
+		spin_unlock_irqrestore(&priv->reglock, flags);
+	}
+
+	return done;
+}
+
+static void netsec_set_tx_de(struct netsec_priv *priv,
+			     struct netsec_desc_ring *dring,
+			     const struct netsec_tx_pkt_ctrl *tx_ctrl,
+			     const struct netsec_desc *desc,
+			     struct sk_buff *skb)
+{
+	int idx = dring->head;
+	struct netsec_de *de;
+	u32 attr;
+
+	de = dring->vaddr + (DESC_SZ * idx);
+
+	attr = (1 << NETSEC_TX_SHIFT_OWN_FIELD) |
+	       (1 << NETSEC_TX_SHIFT_PT_FIELD) |
+	       (NETSEC_RING_GMAC << NETSEC_TX_SHIFT_TDRID_FIELD) |
+	       (1 << NETSEC_TX_SHIFT_FS_FIELD) |
+	       (1 << NETSEC_TX_LAST) |
+	       (tx_ctrl->cksum_offload_flag << NETSEC_TX_SHIFT_CO) |
+	       (tx_ctrl->tcp_seg_offload_flag << NETSEC_TX_SHIFT_SO) |
+	       (1 << NETSEC_TX_SHIFT_TRS_FIELD);
+	if (idx == DESC_NUM - 1)
+		attr |= (1 << NETSEC_TX_SHIFT_LD_FIELD);
+
+	de->data_buf_addr_up = upper_32_bits(desc->dma_addr);
+	de->data_buf_addr_lw = lower_32_bits(desc->dma_addr);
+	de->buf_len_info = (tx_ctrl->tcp_seg_len << 16) | desc->len;
+	de->attr = attr;
+	dma_wmb();
+
+	dring->desc[idx] = *desc;
+	dring->desc[idx].skb = skb;
+
+	/* move head ahead */
+	dring->head = (dring->head + 1) % DESC_NUM;
+}
+
+static netdev_tx_t netsec_netdev_start_xmit(struct sk_buff *skb,
+					    struct net_device *ndev)
+{
+	struct netsec_priv *priv = netdev_priv(ndev);
+	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_TX];
+	struct netsec_tx_pkt_ctrl tx_ctrl = {};
+	struct netsec_desc tx_desc;
+	u16 tso_seg_len = 0;
+	int filled;
+
+	/* differentiate between full/emtpy ring */
+	if (dring->head >= dring->tail)
+		filled = dring->head - dring->tail;
+	else
+		filled = dring->head + DESC_NUM - dring->tail;
+
+	if (DESC_NUM - filled < 2) { /* if less than 2 available */
+		netif_err(priv, drv, priv->ndev, "%s: TxQFull!\n", __func__);
+		netif_stop_queue(priv->ndev);
+		dma_wmb();
+		return NETDEV_TX_BUSY;
+	}
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL)
+		tx_ctrl.cksum_offload_flag = true;
+
+	if (skb_is_gso(skb))
+		tso_seg_len = skb_shinfo(skb)->gso_size;
+
+	if (tso_seg_len > 0) {
+		if (skb->protocol == htons(ETH_P_IP)) {
+			ip_hdr(skb)->tot_len = 0;
+			tcp_hdr(skb)->check =
+				~tcp_v4_check(0, ip_hdr(skb)->saddr,
+					      ip_hdr(skb)->daddr, 0);
+		} else {
+			ipv6_hdr(skb)->payload_len = 0;
+			tcp_hdr(skb)->check =
+				~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+						 &ipv6_hdr(skb)->daddr,
+						 0, IPPROTO_TCP, 0);
+		}
+
+		tx_ctrl.tcp_seg_offload_flag = true;
+		tx_ctrl.tcp_seg_len = tso_seg_len;
+	}
+
+	tx_desc.dma_addr = dma_map_single(priv->dev, skb->data,
+					  skb_headlen(skb), DMA_TO_DEVICE);
+	if (dma_mapping_error(priv->dev, tx_desc.dma_addr)) {
+		netif_err(priv, drv, priv->ndev,
+			  "%s: DMA mapping failed\n", __func__);
+		ndev->stats.tx_dropped++;
+		dev_kfree_skb_any(skb);
+		return NETDEV_TX_OK;
+	}
+	tx_desc.addr = skb->data;
+	tx_desc.len = skb_headlen(skb);
+
+	skb_tx_timestamp(skb);
+	netdev_sent_queue(priv->ndev, skb->len);
+
+	netsec_set_tx_de(priv, dring, &tx_ctrl, &tx_desc, skb);
+	netsec_write(priv, NETSEC_REG_NRM_TX_PKTCNT, 1); /* submit another tx */
+
+	return NETDEV_TX_OK;
+}
+
+static void netsec_uninit_pkt_dring(struct netsec_priv *priv, int id)
+{
+	struct netsec_desc_ring *dring = &priv->desc_ring[id];
+	struct netsec_desc *desc;
+	u16 idx;
+
+	if (!dring->vaddr || !dring->desc)
+		return;
+
+	for (idx = 0; idx < DESC_NUM; idx++) {
+		desc = &dring->desc[idx];
+		if (!desc->addr)
+			continue;
+
+		dma_unmap_single(priv->dev, desc->dma_addr, desc->len,
+				 id == NETSEC_RING_RX ? DMA_FROM_DEVICE :
+							      DMA_TO_DEVICE);
+		dev_kfree_skb(desc->skb);
+	}
+
+	memset(dring->desc, 0, sizeof(struct netsec_desc) * DESC_NUM);
+	memset(dring->vaddr, 0, DESC_SZ * DESC_NUM);
+
+	dring->head = 0;
+	dring->tail = 0;
+	dring->pkt_cnt = 0;
+}
+
+static void netsec_free_dring(struct netsec_priv *priv, int id)
+{
+	struct netsec_desc_ring *dring = &priv->desc_ring[id];
+
+	if (dring->vaddr) {
+		dma_free_coherent(priv->dev, DESC_SZ * DESC_NUM,
+				  dring->vaddr, dring->desc_phys);
+		dring->vaddr = NULL;
+	}
+
+	kfree(dring->desc);
+	dring->desc = NULL;
+}
+
+static int netsec_alloc_dring(struct netsec_priv *priv, enum ring_id id)
+{
+	struct netsec_desc_ring *dring = &priv->desc_ring[id];
+	int ret = 0;
+
+	dring->vaddr = dma_zalloc_coherent(priv->dev, DESC_SZ * DESC_NUM,
+					   &dring->desc_phys, GFP_KERNEL);
+	if (!dring->vaddr) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	dring->desc = kzalloc(DESC_NUM * sizeof(*dring->desc), GFP_KERNEL);
+	if (!dring->desc) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	return 0;
+err:
+	netsec_free_dring(priv, id);
+
+	return ret;
+}
+
+static int netsec_setup_rx_dring(struct netsec_priv *priv)
+{
+	struct netsec_desc_ring *dring = &priv->desc_ring[NETSEC_RING_RX];
+	struct netsec_desc desc;
+	struct sk_buff *skb;
+	int n;
+
+	desc.len = priv->ndev->mtu + 22;
+
+	for (n = 0; n < DESC_NUM; n++) {
+		skb = netsec_alloc_skb(priv, &desc);
+		if (!skb) {
+			netsec_uninit_pkt_dring(priv, NETSEC_RING_RX);
+			return -ENOMEM;
+		}
+		netsec_set_rx_de(priv, dring, n, &desc, skb);
+	}
+
+	return 0;
+}
+
+static int netsec_netdev_load_ucode_region(struct netsec_priv *priv, u32 reg,
+					   u32 addr_h, u32 addr_l, u32 size)
+{
+	u64 base = (u64)addr_h << 32 | addr_l;
+	void __iomem *ucode;
+	u32 i;
+
+	ucode = ioremap(base, size * sizeof(u32));
+	if (!ucode)
+		return -ENOMEM;
+
+	for (i = 0; i < size; i++)
+		netsec_write(priv, reg, readl(ucode + i * 4));
+
+	iounmap(ucode);
+	return 0;
+}
+
+static int netsec_netdev_load_microcode(struct netsec_priv *priv)
+{
+	u32 addr_h, addr_l, size;
+	int err;
+
+	addr_h = readl(priv->eeprom_base + NETSEC_EEPROM_HM_ME_ADDRESS_H);
+	addr_l = readl(priv->eeprom_base + NETSEC_EEPROM_HM_ME_ADDRESS_L);
+	size = readl(priv->eeprom_base + NETSEC_EEPROM_HM_ME_SIZE);
+	err = netsec_netdev_load_ucode_region(priv, NETSEC_REG_DMAC_HM_CMD_BUF,
+					      addr_h, addr_l, size);
+	if (err)
+		return err;
+
+	addr_h = readl(priv->eeprom_base + NETSEC_EEPROM_MH_ME_ADDRESS_H);
+	addr_l = readl(priv->eeprom_base + NETSEC_EEPROM_MH_ME_ADDRESS_L);
+	size = readl(priv->eeprom_base + NETSEC_EEPROM_MH_ME_SIZE);
+	err = netsec_netdev_load_ucode_region(priv, NETSEC_REG_DMAC_MH_CMD_BUF,
+					      addr_h, addr_l, size);
+	if (err)
+		return err;
+
+	addr_h = 0;
+	addr_l = readl(priv->eeprom_base + NETSEC_EEPROM_PKT_ME_ADDRESS);
+	size = readl(priv->eeprom_base + NETSEC_EEPROM_PKT_ME_SIZE);
+	err = netsec_netdev_load_ucode_region(priv, NETSEC_REG_PKT_CMD_BUF,
+					      addr_h, addr_l, size);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+static int netsec_reset_hardware(struct netsec_priv *priv)
+{
+	u32 value;
+	int err;
+
+	/* stop DMA engines */
+	if (!netsec_read(priv, NETSEC_REG_ADDR_DIS_CORE)) {
+		netsec_write(priv, NETSEC_REG_DMA_HM_CTRL,
+			     NETSEC_DMA_CTRL_REG_STOP);
+		netsec_write(priv, NETSEC_REG_DMA_MH_CTRL,
+			     NETSEC_DMA_CTRL_REG_STOP);
+
+		while (netsec_read(priv, NETSEC_REG_DMA_HM_CTRL) &
+		       NETSEC_DMA_CTRL_REG_STOP)
+			cpu_relax();
+
+		while (netsec_read(priv, NETSEC_REG_DMA_MH_CTRL) &
+		       NETSEC_DMA_CTRL_REG_STOP)
+			cpu_relax();
+	}
+
+	netsec_write(priv, NETSEC_REG_SOFT_RST, NETSEC_SOFT_RST_REG_RESET);
+	netsec_write(priv, NETSEC_REG_SOFT_RST, NETSEC_SOFT_RST_REG_RUN);
+	netsec_write(priv, NETSEC_REG_COM_INIT, NETSEC_COM_INIT_REG_ALL);
+
+	while (netsec_read(priv, NETSEC_REG_COM_INIT) != 0)
+		cpu_relax();
+
+	/* set desc_start addr */
+	netsec_write(priv, NETSEC_REG_NRM_RX_DESC_START_UP,
+		     upper_32_bits(priv->desc_ring[NETSEC_RING_RX].desc_phys));
+	netsec_write(priv, NETSEC_REG_NRM_RX_DESC_START_LW,
+		     lower_32_bits(priv->desc_ring[NETSEC_RING_RX].desc_phys));
+
+	netsec_write(priv, NETSEC_REG_NRM_TX_DESC_START_UP,
+		     upper_32_bits(priv->desc_ring[NETSEC_RING_TX].desc_phys));
+	netsec_write(priv, NETSEC_REG_NRM_TX_DESC_START_LW,
+		     lower_32_bits(priv->desc_ring[NETSEC_RING_TX].desc_phys));
+
+	/* set normal tx dring ring config */
+	netsec_write(priv, NETSEC_REG_NRM_TX_CONFIG,
+		     1 << NETSEC_REG_DESC_ENDIAN);
+	netsec_write(priv, NETSEC_REG_NRM_RX_CONFIG,
+		     1 << NETSEC_REG_DESC_ENDIAN);
+
+	err = netsec_netdev_load_microcode(priv);
+	if (err) {
+		netif_err(priv, probe, priv->ndev,
+			  "%s: failed to load microcode (%d)\n", __func__, err);
+		return err;
+	}
+
+	/* start DMA engines */
+	netsec_write(priv, NETSEC_REG_DMA_TMR_CTRL, priv->freq / 1000000 - 1);
+	netsec_write(priv, NETSEC_REG_ADDR_DIS_CORE, 0);
+
+	usleep_range(1000, 2000);
+
+	if (!(netsec_read(priv, NETSEC_REG_TOP_STATUS) &
+	      NETSEC_TOP_IRQ_REG_CODE_LOAD_END)) {
+		netif_err(priv, probe, priv->ndev,
+			  "microengine start failed\n");
+		return -ENXIO;
+	}
+	netsec_write(priv, NETSEC_REG_TOP_STATUS,
+		     NETSEC_TOP_IRQ_REG_CODE_LOAD_END);
+
+	value = NETSEC_PKT_CTRL_REG_MODE_NRM;
+	if (priv->ndev->mtu > ETH_DATA_LEN)
+		value |= NETSEC_PKT_CTRL_REG_EN_JUMBO;
+
+	/* change to normal mode */
+	netsec_write(priv, NETSEC_REG_DMA_MH_CTRL, MH_CTRL__MODE_TRANS);
+	netsec_write(priv, NETSEC_REG_PKT_CTRL, value);
+
+	while ((netsec_read(priv, NETSEC_REG_MODE_TRANS_COMP_STATUS) &
+		NETSEC_MODE_TRANS_COMP_IRQ_T2N) == 0)
+		cpu_relax();
+
+	/* clear any pending EMPTY/ERR irq status */
+	netsec_write(priv, NETSEC_REG_NRM_TX_STATUS, ~0);
+
+	/* Disable TX & RX intr */
+	netsec_write(priv, NETSEC_REG_INTEN_CLR, ~0);
+
+	return 0;
+}
+
+static int netsec_start_gmac(struct netsec_priv *priv)
+{
+	struct phy_device *phydev = priv->ndev->phydev;
+	u32 value = 0;
+	int ret;
+
+	if (phydev->speed != SPEED_1000)
+		value = (NETSEC_GMAC_MCR_REG_CST |
+			 NETSEC_GMAC_MCR_REG_HALF_DUPLEX_COMMON);
+
+	if (netsec_mac_write(priv, GMAC_REG_MCR, value))
+		return -ETIMEDOUT;
+	if (netsec_mac_write(priv, GMAC_REG_BMR,
+			     NETSEC_GMAC_BMR_REG_RESET))
+		return -ETIMEDOUT;
+
+	/* Wait soft reset */
+	usleep_range(1000, 5000);
+
+	ret = netsec_mac_read(priv, GMAC_REG_BMR, &value);
+	if (ret)
+		return ret;
+	if (value & NETSEC_GMAC_BMR_REG_SWR)
+		return -EAGAIN;
+
+	netsec_write(priv, MAC_REG_DESC_SOFT_RST, 1);
+	if (netsec_wait_while_busy(priv, MAC_REG_DESC_SOFT_RST, 1))
+		return -ETIMEDOUT;
+
+	netsec_write(priv, MAC_REG_DESC_INIT, 1);
+	if (netsec_wait_while_busy(priv, MAC_REG_DESC_INIT, 1))
+		return -ETIMEDOUT;
+
+	if (netsec_mac_write(priv, GMAC_REG_BMR,
+			     NETSEC_GMAC_BMR_REG_COMMON))
+		return -ETIMEDOUT;
+	if (netsec_mac_write(priv, GMAC_REG_RDLAR,
+			     NETSEC_GMAC_RDLAR_REG_COMMON))
+		return -ETIMEDOUT;
+	if (netsec_mac_write(priv, GMAC_REG_TDLAR,
+			     NETSEC_GMAC_TDLAR_REG_COMMON))
+		return -ETIMEDOUT;
+	if (netsec_mac_write(priv, GMAC_REG_MFFR, 0x80000001))
+		return -ETIMEDOUT;
+
+	ret = netsec_mac_update_to_phy_state(priv);
+	if (ret)
+		return ret;
+
+	ret = netsec_mac_read(priv, GMAC_REG_OMR, &value);
+	if (ret)
+		return ret;
+
+	value |= NETSEC_GMAC_OMR_REG_SR;
+	value |= NETSEC_GMAC_OMR_REG_ST;
+
+	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_CLR, ~0);
+	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_CLR, ~0);
+
+	netsec_et_set_coalesce(priv->ndev, &priv->et_coalesce);
+
+	if (netsec_mac_write(priv, GMAC_REG_OMR, value))
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+static int netsec_stop_gmac(struct netsec_priv *priv)
+{
+	u32 value;
+	int ret;
+
+	ret = netsec_mac_read(priv, GMAC_REG_OMR, &value);
+	if (ret)
+		return ret;
+	value &= ~NETSEC_GMAC_OMR_REG_SR;
+	value &= ~NETSEC_GMAC_OMR_REG_ST;
+
+	/* disable all interrupts */
+	netsec_write(priv, NETSEC_REG_NRM_RX_INTEN_CLR, ~0);
+	netsec_write(priv, NETSEC_REG_NRM_TX_INTEN_CLR, ~0);
+
+	return netsec_mac_write(priv, GMAC_REG_OMR, value);
+}
+
+static void netsec_phy_adjust_link(struct net_device *ndev)
+{
+	struct netsec_priv *priv = netdev_priv(ndev);
+
+	if (ndev->phydev->link)
+		netsec_start_gmac(priv);
+	else
+		netsec_stop_gmac(priv);
+
+	phy_print_status(ndev->phydev);
+}
+
+static irqreturn_t netsec_irq_handler(int irq, void *dev_id)
+{
+	struct netsec_priv *priv = dev_id;
+	u32 val, status = netsec_read(priv, NETSEC_REG_TOP_STATUS);
+	unsigned long flags;
+
+	/* Disable interrupts */
+	if (status & NETSEC_IRQ_TX) {
+		val = netsec_read(priv, NETSEC_REG_NRM_TX_STATUS);
+		netsec_write(priv, NETSEC_REG_NRM_TX_STATUS, val);
+	}
+	if (status & NETSEC_IRQ_RX) {
+		val = netsec_read(priv, NETSEC_REG_NRM_RX_STATUS);
+		netsec_write(priv, NETSEC_REG_NRM_RX_STATUS, val);
+	}
+
+	spin_lock_irqsave(&priv->reglock, flags);
+	netsec_write(priv, NETSEC_REG_INTEN_CLR, NETSEC_IRQ_RX | NETSEC_IRQ_TX);
+	spin_unlock_irqrestore(&priv->reglock, flags);
+
+	napi_schedule(&priv->napi);
+
+	return IRQ_HANDLED;
+}
+
+static int netsec_netdev_open(struct net_device *ndev)
+{
+	struct netsec_priv *priv = netdev_priv(ndev);
+	int ret;
+
+	pm_runtime_get_sync(priv->dev);
+
+	ret = netsec_setup_rx_dring(priv);
+	if (ret) {
+		netif_err(priv, probe, priv->ndev,
+			  "%s: fail setup ring\n", __func__);
+		goto err1;
+	}
+
+	ret = request_irq(priv->ndev->irq, netsec_irq_handler,
+			  IRQF_SHARED, "netsec", priv);
+	if (ret) {
+		netif_err(priv, drv, priv->ndev, "request_irq failed\n");
+		goto err2;
+	}
+
+	if (dev_of_node(priv->dev)) {
+		if (!of_phy_connect(priv->ndev, priv->phy_np,
+				    netsec_phy_adjust_link, 0,
+				    priv->phy_interface)) {
+			netif_err(priv, link, priv->ndev, "missing PHY\n");
+			goto err3;
+		}
+	} else {
+		ret = phy_connect_direct(priv->ndev, priv->phydev,
+					 netsec_phy_adjust_link,
+					 priv->phy_interface);
+		if (ret) {
+			netif_err(priv, link, priv->ndev,
+				  "phy_connect_direct() failed (%d)\n", ret);
+			goto err3;
+		}
+	}
+
+	phy_start(ndev->phydev);
+
+	netsec_start_gmac(priv);
+	napi_enable(&priv->napi);
+	netif_start_queue(ndev);
+
+	/* Enable RX intr. */
+	netsec_write(priv, NETSEC_REG_INTEN_SET, NETSEC_IRQ_RX);
+
+	return 0;
+err3:
+	free_irq(priv->ndev->irq, priv);
+err2:
+	netsec_uninit_pkt_dring(priv, NETSEC_RING_RX);
+err1:
+	pm_runtime_put_sync(priv->dev);
+	return ret;
+}
+
+static int netsec_netdev_stop(struct net_device *ndev)
+{
+	struct netsec_priv *priv = netdev_priv(ndev);
+
+	netif_stop_queue(priv->ndev);
+	dma_wmb();
+
+	napi_disable(&priv->napi);
+
+	netsec_write(priv, NETSEC_REG_INTEN_CLR, ~0);
+	netsec_stop_gmac(priv);
+
+	free_irq(priv->ndev->irq, priv);
+
+	netsec_uninit_pkt_dring(priv, NETSEC_RING_TX);
+	netsec_uninit_pkt_dring(priv, NETSEC_RING_RX);
+
+	phy_stop(ndev->phydev);
+	phy_disconnect(ndev->phydev);
+
+	pm_runtime_put_sync(priv->dev);
+
+	return 0;
+}
+
+static int netsec_netdev_init(struct net_device *ndev)
+{
+	struct netsec_priv *priv = netdev_priv(ndev);
+	int ret;
+
+	ret = netsec_alloc_dring(priv, NETSEC_RING_TX);
+	if (ret)
+		return ret;
+
+	ret = netsec_alloc_dring(priv, NETSEC_RING_RX);
+	if (ret)
+		goto err1;
+
+	ret = netsec_reset_hardware(priv);
+	if (ret)
+		goto err2;
+
+	return 0;
+err2:
+	netsec_free_dring(priv, NETSEC_RING_RX);
+err1:
+	netsec_free_dring(priv, NETSEC_RING_TX);
+	return ret;
+}
+
+static void netsec_netdev_uninit(struct net_device *ndev)
+{
+	struct netsec_priv *priv = netdev_priv(ndev);
+
+	netsec_free_dring(priv, NETSEC_RING_RX);
+	netsec_free_dring(priv, NETSEC_RING_TX);
+}
+
+static int netsec_netdev_set_features(struct net_device *ndev,
+				      netdev_features_t features)
+{
+	struct netsec_priv *priv = netdev_priv(ndev);
+
+	priv->rx_cksum_offload_flag = !!(features & NETIF_F_RXCSUM);
+
+	return 0;
+}
+
+static int netsec_netdev_ioctl(struct net_device *ndev, struct ifreq *ifr,
+			       int cmd)
+{
+	return phy_mii_ioctl(ndev->phydev, ifr, cmd);
+}
+
+static const struct net_device_ops netsec_netdev_ops = {
+	.ndo_init		= netsec_netdev_init,
+	.ndo_uninit		= netsec_netdev_uninit,
+	.ndo_open		= netsec_netdev_open,
+	.ndo_stop		= netsec_netdev_stop,
+	.ndo_start_xmit		= netsec_netdev_start_xmit,
+	.ndo_set_features	= netsec_netdev_set_features,
+	.ndo_set_mac_address    = eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_do_ioctl		= netsec_netdev_ioctl,
+};
+
+static int netsec_of_probe(struct platform_device *pdev,
+			   struct netsec_priv *priv)
+{
+	priv->phy_np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
+	if (!priv->phy_np) {
+		dev_err(&pdev->dev, "missing required property 'phy-handle'\n");
+		return -EINVAL;
+	}
+
+	priv->clk = devm_clk_get(&pdev->dev, NULL); /* get by 'phy_ref_clk' */
+	if (IS_ERR(priv->clk)) {
+		dev_err(&pdev->dev, "phy_ref_clk not found\n");
+		return PTR_ERR(priv->clk);
+	}
+	priv->freq = clk_get_rate(priv->clk);
+
+	return 0;
+}
+
+static int netsec_acpi_probe(struct platform_device *pdev,
+			     struct netsec_priv *priv, u32 *phy_addr)
+{
+	int ret;
+
+	if (!IS_ENABLED(CONFIG_ACPI))
+		return -ENODEV;
+
+	ret = device_property_read_u32(&pdev->dev, "phy-channel", phy_addr);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"missing required property 'phy-channel'\n");
+		return ret;
+	}
+
+	ret = device_property_read_u32(&pdev->dev,
+				       "socionext,phy-clock-frequency",
+				       &priv->freq);
+	if (ret)
+		dev_err(&pdev->dev,
+			"missing required property 'socionext,phy-clock-frequency'\n");
+	return ret;
+}
+
+static void netsec_unregister_mdio(struct netsec_priv *priv)
+{
+	struct phy_device *phydev = priv->phydev;
+
+	if (!dev_of_node(priv->dev) && phydev) {
+		phy_device_remove(phydev);
+		phy_device_free(phydev);
+	}
+
+	mdiobus_unregister(priv->mii_bus);
+}
+
+static int netsec_register_mdio(struct netsec_priv *priv, u32 phy_addr)
+{
+	struct mii_bus *bus;
+	int ret;
+
+	bus = devm_mdiobus_alloc(priv->dev);
+	if (!bus)
+		return -ENOMEM;
+
+	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", dev_name(priv->dev));
+	bus->priv = priv;
+	bus->name = "SNI NETSEC MDIO";
+	bus->read = netsec_phy_read;
+	bus->write = netsec_phy_write;
+	bus->parent = priv->dev;
+	priv->mii_bus = bus;
+
+	if (dev_of_node(priv->dev)) {
+		struct device_node *mdio_node, *parent = dev_of_node(priv->dev);
+
+		mdio_node = of_get_child_by_name(parent, "mdio");
+		if (mdio_node) {
+			parent = mdio_node;
+		} else {
+			/* older f/w doesn't populate the mdio subnode,
+			 * allow relaxed upgrade of f/w in due time.
+			 */
+			dev_info(priv->dev, "Upgrade f/w for mdio subnode!\n");
+		}
+
+		ret = of_mdiobus_register(bus, parent);
+		of_node_put(mdio_node);
+
+		if (ret) {
+			dev_err(priv->dev, "mdiobus register err(%d)\n", ret);
+			return ret;
+		}
+	} else {
+		/* Mask out all PHYs from auto probing. */
+		bus->phy_mask = ~0;
+		ret = mdiobus_register(bus);
+		if (ret) {
+			dev_err(priv->dev, "mdiobus register err(%d)\n", ret);
+			return ret;
+		}
+
+		priv->phydev = get_phy_device(bus, phy_addr, false);
+		if (IS_ERR(priv->phydev)) {
+			ret = PTR_ERR(priv->phydev);
+			dev_err(priv->dev, "get_phy_device err(%d)\n", ret);
+			priv->phydev = NULL;
+			return -ENODEV;
+		}
+
+		ret = phy_device_register(priv->phydev);
+		if (ret) {
+			mdiobus_unregister(bus);
+			dev_err(priv->dev,
+				"phy_device_register err(%d)\n", ret);
+		}
+	}
+
+	return ret;
+}
+
+static int netsec_probe(struct platform_device *pdev)
+{
+	struct resource *mmio_res, *eeprom_res, *irq_res;
+	u8 *mac, macbuf[ETH_ALEN];
+	struct netsec_priv *priv;
+	u32 hw_ver, phy_addr = 0;
+	struct net_device *ndev;
+	int ret;
+
+	mmio_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mmio_res) {
+		dev_err(&pdev->dev, "No MMIO resource found.\n");
+		return -ENODEV;
+	}
+
+	eeprom_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!eeprom_res) {
+		dev_info(&pdev->dev, "No EEPROM resource found.\n");
+		return -ENODEV;
+	}
+
+	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!irq_res) {
+		dev_err(&pdev->dev, "No IRQ resource found.\n");
+		return -ENODEV;
+	}
+
+	ndev = alloc_etherdev(sizeof(*priv));
+	if (!ndev)
+		return -ENOMEM;
+
+	priv = netdev_priv(ndev);
+
+	spin_lock_init(&priv->reglock);
+	SET_NETDEV_DEV(ndev, &pdev->dev);
+	platform_set_drvdata(pdev, priv);
+	ndev->irq = irq_res->start;
+	priv->dev = &pdev->dev;
+	priv->ndev = ndev;
+
+	priv->msg_enable = NETIF_MSG_TX_ERR | NETIF_MSG_HW | NETIF_MSG_DRV |
+			   NETIF_MSG_LINK | NETIF_MSG_PROBE;
+
+	priv->phy_interface = device_get_phy_mode(&pdev->dev);
+	if (priv->phy_interface < 0) {
+		dev_err(&pdev->dev, "missing required property 'phy-mode'\n");
+		ret = -ENODEV;
+		goto free_ndev;
+	}
+
+	priv->ioaddr = devm_ioremap(&pdev->dev, mmio_res->start,
+				    resource_size(mmio_res));
+	if (!priv->ioaddr) {
+		dev_err(&pdev->dev, "devm_ioremap() failed\n");
+		ret = -ENXIO;
+		goto free_ndev;
+	}
+
+	priv->eeprom_base = devm_ioremap(&pdev->dev, eeprom_res->start,
+					 resource_size(eeprom_res));
+	if (!priv->eeprom_base) {
+		dev_err(&pdev->dev, "devm_ioremap() failed for EEPROM\n");
+		ret = -ENXIO;
+		goto free_ndev;
+	}
+
+	mac = device_get_mac_address(&pdev->dev, macbuf, sizeof(macbuf));
+	if (mac)
+		ether_addr_copy(ndev->dev_addr, mac);
+
+	if (priv->eeprom_base &&
+	    (!mac || !is_valid_ether_addr(ndev->dev_addr))) {
+		void __iomem *macp = priv->eeprom_base +
+					NETSEC_EEPROM_MAC_ADDRESS;
+
+		ndev->dev_addr[0] = readb(macp + 3);
+		ndev->dev_addr[1] = readb(macp + 2);
+		ndev->dev_addr[2] = readb(macp + 1);
+		ndev->dev_addr[3] = readb(macp + 0);
+		ndev->dev_addr[4] = readb(macp + 7);
+		ndev->dev_addr[5] = readb(macp + 6);
+	}
+
+	if (!is_valid_ether_addr(ndev->dev_addr)) {
+		dev_warn(&pdev->dev, "No MAC address found, using random\n");
+		eth_hw_addr_random(ndev);
+	}
+
+	if (dev_of_node(&pdev->dev))
+		ret = netsec_of_probe(pdev, priv);
+	else
+		ret = netsec_acpi_probe(pdev, priv, &phy_addr);
+	if (ret)
+		goto free_ndev;
+
+	if (!priv->freq) {
+		dev_err(&pdev->dev, "missing PHY reference clock frequency\n");
+		ret = -ENODEV;
+		goto free_ndev;
+	}
+
+	/* default for throughput */
+	priv->et_coalesce.rx_coalesce_usecs = 500;
+	priv->et_coalesce.rx_max_coalesced_frames = 8;
+	priv->et_coalesce.tx_coalesce_usecs = 500;
+	priv->et_coalesce.tx_max_coalesced_frames = 8;
+
+	ret = device_property_read_u32(&pdev->dev, "max-frame-size",
+				       &ndev->max_mtu);
+	if (ret < 0)
+		ndev->max_mtu = ETH_DATA_LEN;
+
+	/* runtime_pm coverage just for probe, open/close also cover it */
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
+
+	hw_ver = netsec_read(priv, NETSEC_REG_F_TAIKI_VER);
+	/* this driver only supports F_TAIKI style NETSEC */
+	if (NETSEC_F_NETSEC_VER_MAJOR_NUM(hw_ver) !=
+	    NETSEC_F_NETSEC_VER_MAJOR_NUM(NETSEC_REG_NETSEC_VER_F_TAIKI)) {
+		ret = -ENODEV;
+		goto pm_disable;
+	}
+
+	dev_info(&pdev->dev, "hardware revision %d.%d\n",
+		 hw_ver >> 16, hw_ver & 0xffff);
+
+	netif_napi_add(ndev, &priv->napi, netsec_napi_poll, NAPI_BUDGET);
+
+	ndev->netdev_ops = &netsec_netdev_ops;
+	ndev->ethtool_ops = &netsec_ethtool_ops;
+
+	ndev->features |= NETIF_F_HIGHDMA | NETIF_F_RXCSUM | NETIF_F_GSO |
+				NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
+	ndev->hw_features = ndev->features;
+
+	priv->rx_cksum_offload_flag = true;
+
+	ret = netsec_register_mdio(priv, phy_addr);
+	if (ret)
+		goto unreg_napi;
+
+	if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)))
+		dev_warn(&pdev->dev, "Failed to enable 64-bit DMA\n");
+
+	ret = register_netdev(ndev);
+	if (ret) {
+		netif_err(priv, probe, ndev, "register_netdev() failed\n");
+		goto unreg_mii;
+	}
+
+	pm_runtime_put_sync(&pdev->dev);
+	return 0;
+
+unreg_mii:
+	netsec_unregister_mdio(priv);
+unreg_napi:
+	netif_napi_del(&priv->napi);
+pm_disable:
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+free_ndev:
+	free_netdev(ndev);
+	dev_err(&pdev->dev, "init failed\n");
+
+	return ret;
+}
+
+static int netsec_remove(struct platform_device *pdev)
+{
+	struct netsec_priv *priv = platform_get_drvdata(pdev);
+
+	unregister_netdev(priv->ndev);
+
+	netsec_unregister_mdio(priv);
+
+	netif_napi_del(&priv->napi);
+
+	pm_runtime_disable(&pdev->dev);
+	free_netdev(priv->ndev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int netsec_runtime_suspend(struct device *dev)
+{
+	struct netsec_priv *priv = dev_get_drvdata(dev);
+
+	netsec_write(priv, NETSEC_REG_CLK_EN, 0);
+
+	clk_disable_unprepare(priv->clk);
+
+	return 0;
+}
+
+static int netsec_runtime_resume(struct device *dev)
+{
+	struct netsec_priv *priv = dev_get_drvdata(dev);
+
+	clk_prepare_enable(priv->clk);
+
+	netsec_write(priv, NETSEC_REG_CLK_EN, NETSEC_CLK_EN_REG_DOM_D |
+					       NETSEC_CLK_EN_REG_DOM_C |
+					       NETSEC_CLK_EN_REG_DOM_G);
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops netsec_pm_ops = {
+	SET_RUNTIME_PM_OPS(netsec_runtime_suspend, netsec_runtime_resume, NULL)
+};
+
+static const struct of_device_id netsec_dt_ids[] = {
+	{ .compatible = "socionext,synquacer-netsec" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, netsec_dt_ids);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id netsec_acpi_ids[] = {
+	{ "SCX0001" },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, netsec_acpi_ids);
+#endif
+
+static struct platform_driver netsec_driver = {
+	.probe	= netsec_probe,
+	.remove	= netsec_remove,
+	.driver = {
+		.name = "netsec",
+		.pm = &netsec_pm_ops,
+		.of_match_table = netsec_dt_ids,
+		.acpi_match_table = ACPI_PTR(netsec_acpi_ids),
+	},
+};
+module_platform_driver(netsec_driver);
+
+MODULE_AUTHOR("Jassi Brar <jaswinder.singh@linaro.org>");
+MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
+MODULE_DESCRIPTION("NETSEC Ethernet driver");
+MODULE_LICENSE("GPL");