net: Add Gigabit Ethernet driver of Topcliff PCH

Signed-off-by: Masayuki Ohtake <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/Kconfig

···
 
 source "drivers/net/stmmac/Kconfig"
 
+config PCH_GBE
+	tristate "PCH Gigabit Ethernet"
+	depends on PCI
+	---help---
+	  This is a gigabit ethernet driver for Topcliff PCH.
+	  Topcliff PCH is the platform controller hub that is used in Intel's
+	  general embedded platform.
+	  Topcliff PCH has Gigabit Ethernet interface.
+	  Using this interface, it is able to access system devices connected
+	  to Gigabit Ethernet.
+	  This driver enables Gigabit Ethernet function.
+
 endif # NETDEV_1000
 
 #

drivers/net/Makefile

···
 obj-$(CONFIG_CAIF) += caif/
 
 obj-$(CONFIG_OCTEON_MGMT_ETHERNET) += octeon/
+obj-$(CONFIG_PCH_GBE) += pch_gbe/

drivers/net/pch_gbe/Makefile

···
+obj-$(CONFIG_PCH_GBE) += pch_gbe.o
+
+pch_gbe-y := pch_gbe_phy.o pch_gbe_ethtool.o pch_gbe_param.o
+pch_gbe-y += pch_gbe_api.o pch_gbe_main.o

drivers/net/pch_gbe/pch_gbe.h

···
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This code was derived from the Intel e1000e Linux driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifndef _PCH_GBE_H_
+#define _PCH_GBE_H_
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/mii.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/vmalloc.h>
+#include <net/ip.h>
+
+/**
+ * pch_gbe_regs_mac_adr - Structure holding values of mac address registers
+ * @high	Denotes the 1st to 4th byte from the initial of MAC address
+ * @low		Denotes the 5th to 6th byte from the initial of MAC address
+ */
+struct pch_gbe_regs_mac_adr {
+	u32 high;
+	u32 low;
+};
+/**
+ * pch_udc_regs - Structure holding values of MAC registers
+ */
+struct pch_gbe_regs {
+	u32 INT_ST;
+	u32 INT_EN;
+	u32 MODE;
+	u32 RESET;
+	u32 TCPIP_ACC;
+	u32 EX_LIST;
+	u32 INT_ST_HOLD;
+	u32 PHY_INT_CTRL;
+	u32 MAC_RX_EN;
+	u32 RX_FCTRL;
+	u32 PAUSE_REQ;
+	u32 RX_MODE;
+	u32 TX_MODE;
+	u32 RX_FIFO_ST;
+	u32 TX_FIFO_ST;
+	u32 TX_FID;
+	u32 TX_RESULT;
+	u32 PAUSE_PKT1;
+	u32 PAUSE_PKT2;
+	u32 PAUSE_PKT3;
+	u32 PAUSE_PKT4;
+	u32 PAUSE_PKT5;
+	u32 reserve[2];
+	struct pch_gbe_regs_mac_adr mac_adr[16];
+	u32 ADDR_MASK;
+	u32 MIIM;
+	u32 reserve2;
+	u32 RGMII_ST;
+	u32 RGMII_CTRL;
+	u32 reserve3[3];
+	u32 DMA_CTRL;
+	u32 reserve4[3];
+	u32 RX_DSC_BASE;
+	u32 RX_DSC_SIZE;
+	u32 RX_DSC_HW_P;
+	u32 RX_DSC_HW_P_HLD;
+	u32 RX_DSC_SW_P;
+	u32 reserve5[3];
+	u32 TX_DSC_BASE;
+	u32 TX_DSC_SIZE;
+	u32 TX_DSC_HW_P;
+	u32 TX_DSC_HW_P_HLD;
+	u32 TX_DSC_SW_P;
+	u32 reserve6[3];
+	u32 RX_DMA_ST;
+	u32 TX_DMA_ST;
+	u32 reserve7[2];
+	u32 WOL_ST;
+	u32 WOL_CTRL;
+	u32 WOL_ADDR_MASK;
+};
+
+/* Interrupt Status */
+/* Interrupt Status Hold */
+/* Interrupt Enable */
+#define PCH_GBE_INT_RX_DMA_CMPLT  0x00000001 /* Receive DMA Transfer Complete */
+#define PCH_GBE_INT_RX_VALID      0x00000002 /* MAC Normal Receive Complete */
+#define PCH_GBE_INT_RX_FRAME_ERR  0x00000004 /* Receive frame error */
+#define PCH_GBE_INT_RX_FIFO_ERR   0x00000008 /* Receive FIFO Overflow */
+#define PCH_GBE_INT_RX_DMA_ERR    0x00000010 /* Receive DMA Transfer Error */
+#define PCH_GBE_INT_RX_DSC_EMP    0x00000020 /* Receive Descriptor Empty */
+#define PCH_GBE_INT_TX_CMPLT      0x00000100 /* MAC Transmission Complete */
+#define PCH_GBE_INT_TX_DMA_CMPLT  0x00000200 /* DMA Transfer Complete */
+#define PCH_GBE_INT_TX_FIFO_ERR   0x00000400 /* Transmission FIFO underflow. */
+#define PCH_GBE_INT_TX_DMA_ERR    0x00000800 /* Transmission DMA Error */
+#define PCH_GBE_INT_PAUSE_CMPLT   0x00001000 /* Pause Transmission complete */
+#define PCH_GBE_INT_MIIM_CMPLT    0x00010000 /* MIIM I/F Read completion */
+#define PCH_GBE_INT_PHY_INT       0x00100000 /* Interruption from PHY */
+#define PCH_GBE_INT_WOL_DET       0x01000000 /* Wake On LAN Event detection. */
+#define PCH_GBE_INT_TCPIP_ERR     0x10000000 /* TCP/IP Accelerator Error */
+
+/* Mode */
+#define PCH_GBE_MODE_MII_ETHER      0x00000000  /* GIGA Ethernet Mode [MII] */
+#define PCH_GBE_MODE_GMII_ETHER     0x80000000  /* GIGA Ethernet Mode [GMII] */
+#define PCH_GBE_MODE_HALF_DUPLEX    0x00000000  /* Duplex Mode [half duplex] */
+#define PCH_GBE_MODE_FULL_DUPLEX    0x40000000  /* Duplex Mode [full duplex] */
+#define PCH_GBE_MODE_FR_BST         0x04000000  /* Frame bursting is done */
+
+/* Reset */
+#define PCH_GBE_ALL_RST         0x80000000  /* All reset */
+#define PCH_GBE_TX_RST          0x40000000  /* TX MAC, TX FIFO, TX DMA reset */
+#define PCH_GBE_RX_RST          0x04000000  /* RX MAC, RX FIFO, RX DMA reset */
+
+/* TCP/IP Accelerator Control */
+#define PCH_GBE_EX_LIST_EN      0x00000008  /* External List Enable */
+#define PCH_GBE_RX_TCPIPACC_OFF 0x00000004  /* RX TCP/IP ACC Disabled */
+#define PCH_GBE_TX_TCPIPACC_EN  0x00000002  /* TX TCP/IP ACC Enable */
+#define PCH_GBE_RX_TCPIPACC_EN  0x00000001  /* RX TCP/IP ACC Enable */
+
+/* MAC RX Enable */
+#define PCH_GBE_MRE_MAC_RX_EN   0x00000001      /* MAC Receive Enable */
+
+/* RX Flow Control */
+#define PCH_GBE_FL_CTRL_EN      0x80000000  /* Pause packet is enabled */
+
+/* Pause Packet Request */
+#define PCH_GBE_PS_PKT_RQ       0x80000000  /* Pause packet Request */
+
+/* RX Mode */
+#define PCH_GBE_ADD_FIL_EN      0x80000000  /* Address Filtering Enable */
+/* Multicast Filtering Enable */
+#define PCH_GBE_MLT_FIL_EN      0x40000000
+/* Receive Almost Empty Threshold */
+#define PCH_GBE_RH_ALM_EMP_4    0x00000000      /* 4 words */
+#define PCH_GBE_RH_ALM_EMP_8    0x00004000      /* 8 words */
+#define PCH_GBE_RH_ALM_EMP_16   0x00008000      /* 16 words */
+#define PCH_GBE_RH_ALM_EMP_32   0x0000C000      /* 32 words */
+/* Receive Almost Full Threshold */
+#define PCH_GBE_RH_ALM_FULL_4   0x00000000      /* 4 words */
+#define PCH_GBE_RH_ALM_FULL_8   0x00001000      /* 8 words */
+#define PCH_GBE_RH_ALM_FULL_16  0x00002000      /* 16 words */
+#define PCH_GBE_RH_ALM_FULL_32  0x00003000      /* 32 words */
+/* RX FIFO Read Triger Threshold */
+#define PCH_GBE_RH_RD_TRG_4     0x00000000      /* 4 words */
+#define PCH_GBE_RH_RD_TRG_8     0x00000200      /* 8 words */
+#define PCH_GBE_RH_RD_TRG_16    0x00000400      /* 16 words */
+#define PCH_GBE_RH_RD_TRG_32    0x00000600      /* 32 words */
+#define PCH_GBE_RH_RD_TRG_64    0x00000800      /* 64 words */
+#define PCH_GBE_RH_RD_TRG_128   0x00000A00      /* 128 words */
+#define PCH_GBE_RH_RD_TRG_256   0x00000C00      /* 256 words */
+#define PCH_GBE_RH_RD_TRG_512   0x00000E00      /* 512 words */
+
+/* Receive Descriptor bit definitions */
+#define PCH_GBE_RXD_ACC_STAT_BCAST          0x00000400
+#define PCH_GBE_RXD_ACC_STAT_MCAST          0x00000200
+#define PCH_GBE_RXD_ACC_STAT_UCAST          0x00000100
+#define PCH_GBE_RXD_ACC_STAT_TCPIPOK        0x000000C0
+#define PCH_GBE_RXD_ACC_STAT_IPOK           0x00000080
+#define PCH_GBE_RXD_ACC_STAT_TCPOK          0x00000040
+#define PCH_GBE_RXD_ACC_STAT_IP6ERR         0x00000020
+#define PCH_GBE_RXD_ACC_STAT_OFLIST         0x00000010
+#define PCH_GBE_RXD_ACC_STAT_TYPEIP         0x00000008
+#define PCH_GBE_RXD_ACC_STAT_MACL           0x00000004
+#define PCH_GBE_RXD_ACC_STAT_PPPOE          0x00000002
+#define PCH_GBE_RXD_ACC_STAT_VTAGT          0x00000001
+#define PCH_GBE_RXD_GMAC_STAT_PAUSE         0x0200
+#define PCH_GBE_RXD_GMAC_STAT_MARBR         0x0100
+#define PCH_GBE_RXD_GMAC_STAT_MARMLT        0x0080
+#define PCH_GBE_RXD_GMAC_STAT_MARIND        0x0040
+#define PCH_GBE_RXD_GMAC_STAT_MARNOTMT      0x0020
+#define PCH_GBE_RXD_GMAC_STAT_TLONG         0x0010
+#define PCH_GBE_RXD_GMAC_STAT_TSHRT         0x0008
+#define PCH_GBE_RXD_GMAC_STAT_NOTOCTAL      0x0004
+#define PCH_GBE_RXD_GMAC_STAT_NBLERR        0x0002
+#define PCH_GBE_RXD_GMAC_STAT_CRCERR        0x0001
+
+/* Transmit Descriptor bit definitions */
+#define PCH_GBE_TXD_CTRL_TCPIP_ACC_OFF      0x0008
+#define PCH_GBE_TXD_CTRL_ITAG               0x0004
+#define PCH_GBE_TXD_CTRL_ICRC               0x0002
+#define PCH_GBE_TXD_CTRL_APAD               0x0001
+#define PCH_GBE_TXD_WORDS_SHIFT             2
+#define PCH_GBE_TXD_GMAC_STAT_CMPLT         0x2000
+#define PCH_GBE_TXD_GMAC_STAT_ABT           0x1000
+#define PCH_GBE_TXD_GMAC_STAT_EXCOL         0x0800
+#define PCH_GBE_TXD_GMAC_STAT_SNGCOL        0x0400
+#define PCH_GBE_TXD_GMAC_STAT_MLTCOL        0x0200
+#define PCH_GBE_TXD_GMAC_STAT_CRSER         0x0100
+#define PCH_GBE_TXD_GMAC_STAT_TLNG          0x0080
+#define PCH_GBE_TXD_GMAC_STAT_TSHRT         0x0040
+#define PCH_GBE_TXD_GMAC_STAT_LTCOL         0x0020
+#define PCH_GBE_TXD_GMAC_STAT_TFUNDFLW      0x0010
+#define PCH_GBE_TXD_GMAC_STAT_RTYCNT_MASK   0x000F
+
+/* TX Mode */
+#define PCH_GBE_TM_NO_RTRY     0x80000000 /* No Retransmission */
+#define PCH_GBE_TM_LONG_PKT    0x40000000 /* Long Packt TX Enable */
+#define PCH_GBE_TM_ST_AND_FD   0x20000000 /* Stare and Forward */
+#define PCH_GBE_TM_SHORT_PKT   0x10000000 /* Short Packet TX Enable */
+#define PCH_GBE_TM_LTCOL_RETX  0x08000000 /* Retransmission at Late Collision */
+/* Frame Start Threshold */
+#define PCH_GBE_TM_TH_TX_STRT_4    0x00000000    /* 4 words */
+#define PCH_GBE_TM_TH_TX_STRT_8    0x00004000    /* 8 words */
+#define PCH_GBE_TM_TH_TX_STRT_16   0x00008000    /* 16 words */
+#define PCH_GBE_TM_TH_TX_STRT_32   0x0000C000    /* 32 words */
+/* Transmit Almost Empty Threshold */
+#define PCH_GBE_TM_TH_ALM_EMP_4    0x00000000    /* 4 words */
+#define PCH_GBE_TM_TH_ALM_EMP_8    0x00000800    /* 8 words */
+#define PCH_GBE_TM_TH_ALM_EMP_16   0x00001000    /* 16 words */
+#define PCH_GBE_TM_TH_ALM_EMP_32   0x00001800    /* 32 words */
+#define PCH_GBE_TM_TH_ALM_EMP_64   0x00002000    /* 64 words */
+#define PCH_GBE_TM_TH_ALM_EMP_128  0x00002800    /* 128 words */
+#define PCH_GBE_TM_TH_ALM_EMP_256  0x00003000    /* 256 words */
+#define PCH_GBE_TM_TH_ALM_EMP_512  0x00003800    /* 512 words */
+/* Transmit Almost Full Threshold */
+#define PCH_GBE_TM_TH_ALM_FULL_4   0x00000000    /* 4 words */
+#define PCH_GBE_TM_TH_ALM_FULL_8   0x00000200    /* 8 words */
+#define PCH_GBE_TM_TH_ALM_FULL_16  0x00000400    /* 16 words */
+#define PCH_GBE_TM_TH_ALM_FULL_32  0x00000600    /* 32 words */
+
+/* RX FIFO Status */
+#define PCH_GBE_RF_ALM_FULL     0x80000000  /* RX FIFO is almost full. */
+#define PCH_GBE_RF_ALM_EMP      0x40000000  /* RX FIFO is almost empty. */
+#define PCH_GBE_RF_RD_TRG       0x20000000  /* Become more than RH_RD_TRG. */
+#define PCH_GBE_RF_STRWD        0x1FFE0000  /* The word count of RX FIFO. */
+#define PCH_GBE_RF_RCVING       0x00010000  /* Stored in RX FIFO. */
+
+/* MAC Address Mask */
+#define PCH_GBE_BUSY                0x80000000
+
+/* MIIM  */
+#define PCH_GBE_MIIM_OPER_WRITE     0x04000000
+#define PCH_GBE_MIIM_OPER_READ      0x00000000
+#define PCH_GBE_MIIM_OPER_READY     0x04000000
+#define PCH_GBE_MIIM_PHY_ADDR_SHIFT 21
+#define PCH_GBE_MIIM_REG_ADDR_SHIFT 16
+
+/* RGMII Status */
+#define PCH_GBE_LINK_UP             0x80000008
+#define PCH_GBE_RXC_SPEED_MSK       0x00000006
+#define PCH_GBE_RXC_SPEED_2_5M      0x00000000    /* 2.5MHz */
+#define PCH_GBE_RXC_SPEED_25M       0x00000002    /* 25MHz  */
+#define PCH_GBE_RXC_SPEED_125M      0x00000004    /* 100MHz */
+#define PCH_GBE_DUPLEX_FULL         0x00000001
+
+/* RGMII Control */
+#define PCH_GBE_CRS_SEL             0x00000010
+#define PCH_GBE_RGMII_RATE_125M     0x00000000
+#define PCH_GBE_RGMII_RATE_25M      0x00000008
+#define PCH_GBE_RGMII_RATE_2_5M     0x0000000C
+#define PCH_GBE_RGMII_MODE_GMII     0x00000000
+#define PCH_GBE_RGMII_MODE_RGMII    0x00000002
+#define PCH_GBE_CHIP_TYPE_EXTERNAL  0x00000000
+#define PCH_GBE_CHIP_TYPE_INTERNAL  0x00000001
+
+/* DMA Control */
+#define PCH_GBE_RX_DMA_EN       0x00000002   /* Enables Receive DMA */
+#define PCH_GBE_TX_DMA_EN       0x00000001   /* Enables Transmission DMA */
+
+/* Wake On LAN Status */
+#define PCH_GBE_WLS_BR          0x00000008 /* Broadcas Address */
+#define PCH_GBE_WLS_MLT         0x00000004 /* Multicast Address */
+
+/* The Frame registered in Address Recognizer */
+#define PCH_GBE_WLS_IND         0x00000002
+#define PCH_GBE_WLS_MP          0x00000001 /* Magic packet Address */
+
+/* Wake On LAN Control */
+#define PCH_GBE_WLC_WOL_MODE    0x00010000
+#define PCH_GBE_WLC_IGN_TLONG   0x00000100
+#define PCH_GBE_WLC_IGN_TSHRT   0x00000080
+#define PCH_GBE_WLC_IGN_OCTER   0x00000040
+#define PCH_GBE_WLC_IGN_NBLER   0x00000020
+#define PCH_GBE_WLC_IGN_CRCER   0x00000010
+#define PCH_GBE_WLC_BR          0x00000008
+#define PCH_GBE_WLC_MLT         0x00000004
+#define PCH_GBE_WLC_IND         0x00000002
+#define PCH_GBE_WLC_MP          0x00000001
+
+/* Wake On LAN Address Mask */
+#define PCH_GBE_WLA_BUSY        0x80000000
+
+
+
+/* TX/RX descriptor defines */
+#define PCH_GBE_MAX_TXD                     4096
+#define PCH_GBE_DEFAULT_TXD                  256
+#define PCH_GBE_MIN_TXD                        8
+#define PCH_GBE_MAX_RXD                     4096
+#define PCH_GBE_DEFAULT_RXD                  256
+#define PCH_GBE_MIN_RXD                        8
+
+/* Number of Transmit and Receive Descriptors must be a multiple of 8 */
+#define PCH_GBE_TX_DESC_MULTIPLE               8
+#define PCH_GBE_RX_DESC_MULTIPLE               8
+
+/* Read/Write operation is done through MII Management IF */
+#define PCH_GBE_HAL_MIIM_READ          ((u32)0x00000000)
+#define PCH_GBE_HAL_MIIM_WRITE         ((u32)0x04000000)
+
+/* flow control values */
+#define PCH_GBE_FC_NONE			0
+#define PCH_GBE_FC_RX_PAUSE		1
+#define PCH_GBE_FC_TX_PAUSE		2
+#define PCH_GBE_FC_FULL			3
+#define PCH_GBE_FC_DEFAULT		PCH_GBE_FC_FULL
+
+
+struct pch_gbe_hw;
+/**
+ * struct  pch_gbe_functions - HAL APi function pointer
+ * @get_bus_info:	for pch_gbe_hal_get_bus_info
+ * @init_hw:		for pch_gbe_hal_init_hw
+ * @read_phy_reg:	for pch_gbe_hal_read_phy_reg
+ * @write_phy_reg:	for pch_gbe_hal_write_phy_reg
+ * @reset_phy:		for pch_gbe_hal_phy_hw_reset
+ * @sw_reset_phy:	for pch_gbe_hal_phy_sw_reset
+ * @power_up_phy:	for pch_gbe_hal_power_up_phy
+ * @power_down_phy:	for pch_gbe_hal_power_down_phy
+ * @read_mac_addr:	for pch_gbe_hal_read_mac_addr
+ */
+struct pch_gbe_functions {
+	void (*get_bus_info) (struct pch_gbe_hw *);
+	s32 (*init_hw) (struct pch_gbe_hw *);
+	s32 (*read_phy_reg) (struct pch_gbe_hw *, u32, u16 *);
+	s32 (*write_phy_reg) (struct pch_gbe_hw *, u32, u16);
+	void (*reset_phy) (struct pch_gbe_hw *);
+	void (*sw_reset_phy) (struct pch_gbe_hw *);
+	void (*power_up_phy) (struct pch_gbe_hw *hw);
+	void (*power_down_phy) (struct pch_gbe_hw *hw);
+	s32 (*read_mac_addr) (struct pch_gbe_hw *);
+};
+
+/**
+ * struct pch_gbe_mac_info - MAC infomation
+ * @addr[6]:		Store the MAC address
+ * @fc:			Mode of flow control
+ * @fc_autoneg:		Auto negotiation enable for flow control setting
+ * @tx_fc_enable:	Enable flag of Transmit flow control
+ * @max_frame_size:	Max transmit frame size
+ * @min_frame_size:	Min transmit frame size
+ * @autoneg:		Auto negotiation enable
+ * @link_speed:		Link speed
+ * @link_duplex:	Link duplex
+ */
+struct pch_gbe_mac_info {
+	u8 addr[6];
+	u8 fc;
+	u8 fc_autoneg;
+	u8 tx_fc_enable;
+	u32 max_frame_size;
+	u32 min_frame_size;
+	u8 autoneg;
+	u16 link_speed;
+	u16 link_duplex;
+};
+
+/**
+ * struct pch_gbe_phy_info - PHY infomation
+ * @addr:		PHY address
+ * @id:			PHY's identifier
+ * @revision:		PHY's revision
+ * @reset_delay_us:	HW reset delay time[us]
+ * @autoneg_advertised:	Autoneg advertised
+ */
+struct pch_gbe_phy_info {
+	u32 addr;
+	u32 id;
+	u32 revision;
+	u32 reset_delay_us;
+	u16 autoneg_advertised;
+};
+
+/*!
+ * @ingroup Gigabit Ether driver Layer
+ * @struct  pch_gbe_bus_info
+ * @brief   Bus infomation
+ */
+struct pch_gbe_bus_info {
+	u8 type;
+	u8 speed;
+	u8 width;
+};
+
+/*!
+ * @ingroup Gigabit Ether driver Layer
+ * @struct  pch_gbe_hw
+ * @brief   Hardware infomation
+ */
+struct pch_gbe_hw {
+	void *back;
+
+	struct pch_gbe_regs  __iomem *reg;
+	spinlock_t miim_lock;
+
+	const struct pch_gbe_functions *func;
+	struct pch_gbe_mac_info mac;
+	struct pch_gbe_phy_info phy;
+	struct pch_gbe_bus_info bus;
+};
+
+/**
+ * struct pch_gbe_rx_desc - Receive Descriptor
+ * @buffer_addr:	RX Frame Buffer Address
+ * @tcp_ip_status:	TCP/IP Accelerator Status
+ * @rx_words_eob:	RX word count and Byte position
+ * @gbec_status:	GMAC Status
+ * @dma_status:		DMA Status
+ * @reserved1:		Reserved
+ * @reserved2:		Reserved
+ */
+struct pch_gbe_rx_desc {
+	u32 buffer_addr;
+	u32 tcp_ip_status;
+	u16 rx_words_eob;
+	u16 gbec_status;
+	u8 dma_status;
+	u8 reserved1;
+	u16 reserved2;
+};
+
+/**
+ * struct pch_gbe_tx_desc - Transmit Descriptor
+ * @buffer_addr:	TX Frame Buffer Address
+ * @length:		Data buffer length
+ * @reserved1:		Reserved
+ * @tx_words_eob:	TX word count and Byte position
+ * @tx_frame_ctrl:	TX Frame Control
+ * @dma_status:		DMA Status
+ * @reserved2:		Reserved
+ * @gbec_status:	GMAC Status
+ */
+struct pch_gbe_tx_desc {
+	u32 buffer_addr;
+	u16 length;
+	u16 reserved1;
+	u16 tx_words_eob;
+	u16 tx_frame_ctrl;
+	u8 dma_status;
+	u8 reserved2;
+	u16 gbec_status;
+};
+
+
+/**
+ * struct pch_gbe_buffer - Buffer infomation
+ * @skb:	pointer to a socket buffer
+ * @dma:	DMA address
+ * @time_stamp:	time stamp
+ * @length:	data size
+ */
+struct pch_gbe_buffer {
+	struct sk_buff *skb;
+	dma_addr_t dma;
+	unsigned long time_stamp;
+	u16 length;
+	bool mapped;
+};
+
+/**
+ * struct pch_gbe_tx_ring - tx ring infomation
+ * @tx_lock:	spinlock structs
+ * @desc:	pointer to the descriptor ring memory
+ * @dma:	physical address of the descriptor ring
+ * @size:	length of descriptor ring in bytes
+ * @count:	number of descriptors in the ring
+ * @next_to_use:	next descriptor to associate a buffer with
+ * @next_to_clean:	next descriptor to check for DD status bit
+ * @buffer_info:	array of buffer information structs
+ */
+struct pch_gbe_tx_ring {
+	spinlock_t tx_lock;
+	struct pch_gbe_tx_desc *desc;
+	dma_addr_t dma;
+	unsigned int size;
+	unsigned int count;
+	unsigned int next_to_use;
+	unsigned int next_to_clean;
+	struct pch_gbe_buffer *buffer_info;
+};
+
+/**
+ * struct pch_gbe_rx_ring - rx ring infomation
+ * @desc:	pointer to the descriptor ring memory
+ * @dma:	physical address of the descriptor ring
+ * @size:	length of descriptor ring in bytes
+ * @count:	number of descriptors in the ring
+ * @next_to_use:	next descriptor to associate a buffer with
+ * @next_to_clean:	next descriptor to check for DD status bit
+ * @buffer_info:	array of buffer information structs
+ */
+struct pch_gbe_rx_ring {
+	struct pch_gbe_rx_desc *desc;
+	dma_addr_t dma;
+	unsigned int size;
+	unsigned int count;
+	unsigned int next_to_use;
+	unsigned int next_to_clean;
+	struct pch_gbe_buffer *buffer_info;
+};
+
+/**
+ * struct pch_gbe_hw_stats - Statistics counters collected by the MAC
+ * @rx_packets:		    total packets received
+ * @tx_packets:		    total packets transmitted
+ * @rx_bytes:		    total bytes received
+ * @tx_bytes:		    total bytes transmitted
+ * @rx_errors:		    bad packets received
+ * @tx_errors:		    packet transmit problems
+ * @rx_dropped:		    no space in Linux buffers
+ * @tx_dropped:		    no space available in Linux
+ * @multicast:		    multicast packets received
+ * @collisions:		    collisions
+ * @rx_crc_errors:	    received packet with crc error
+ * @rx_frame_errors:	    received frame alignment error
+ * @rx_alloc_buff_failed:   allocate failure of a receive buffer
+ * @tx_length_errors:	    transmit length error
+ * @tx_aborted_errors:	    transmit aborted error
+ * @tx_carrier_errors:	    transmit carrier error
+ * @tx_timeout_count:	    Number of transmit timeout
+ * @tx_restart_count:	    Number of transmit restert
+ * @intr_rx_dsc_empty_count:	Interrupt count of receive descriptor empty
+ * @intr_rx_frame_err_count:	Interrupt count of receive frame error
+ * @intr_rx_fifo_err_count:	Interrupt count of receive FIFO error
+ * @intr_rx_dma_err_count:	Interrupt count of receive DMA error
+ * @intr_tx_fifo_err_count:	Interrupt count of transmit FIFO error
+ * @intr_tx_dma_err_count:	Interrupt count of transmit DMA error
+ * @intr_tcpip_err_count:	Interrupt count of TCP/IP Accelerator
+ */
+struct pch_gbe_hw_stats {
+	u32 rx_packets;
+	u32 tx_packets;
+	u32 rx_bytes;
+	u32 tx_bytes;
+	u32 rx_errors;
+	u32 tx_errors;
+	u32 rx_dropped;
+	u32 tx_dropped;
+	u32 multicast;
+	u32 collisions;
+	u32 rx_crc_errors;
+	u32 rx_frame_errors;
+	u32 rx_alloc_buff_failed;
+	u32 tx_length_errors;
+	u32 tx_aborted_errors;
+	u32 tx_carrier_errors;
+	u32 tx_timeout_count;
+	u32 tx_restart_count;
+	u32 intr_rx_dsc_empty_count;
+	u32 intr_rx_frame_err_count;
+	u32 intr_rx_fifo_err_count;
+	u32 intr_rx_dma_err_count;
+	u32 intr_tx_fifo_err_count;
+	u32 intr_tx_dma_err_count;
+	u32 intr_tcpip_err_count;
+};
+
+/**
+ * struct pch_gbe_adapter - board specific private data structure
+ * @stats_lock:	Spinlock structure for status
+ * @tx_queue_lock:	Spinlock structure for transmit
+ * @ethtool_lock:	Spinlock structure for ethtool
+ * @irq_sem:		Semaphore for interrupt
+ * @netdev:		Pointer of network device structure
+ * @pdev:		Pointer of pci device structure
+ * @polling_netdev:	Pointer of polling network device structure
+ * @napi:		NAPI structure
+ * @hw:			Pointer of hardware structure
+ * @stats:		Hardware status
+ * @reset_task:		Reset task
+ * @mii:		MII information structure
+ * @watchdog_timer:	Watchdog timer list
+ * @wake_up_evt:	Wake up event
+ * @config_space:	Configuration space
+ * @msg_enable:		Driver message level
+ * @led_status:		LED status
+ * @tx_ring:		Pointer of Tx descriptor ring structure
+ * @rx_ring:		Pointer of Rx descriptor ring structure
+ * @rx_buffer_len:	Receive buffer length
+ * @tx_queue_len:	Transmit queue length
+ * @rx_csum:		Receive TCP/IP checksum enable/disable
+ * @tx_csum:		Transmit TCP/IP checksum enable/disable
+ * @have_msi:		PCI MSI mode flag
+ */
+
+struct pch_gbe_adapter {
+	spinlock_t stats_lock;
+	spinlock_t tx_queue_lock;
+	spinlock_t ethtool_lock;
+	atomic_t irq_sem;
+	struct net_device *netdev;
+	struct pci_dev *pdev;
+	struct net_device *polling_netdev;
+	struct napi_struct napi;
+	struct pch_gbe_hw hw;
+	struct pch_gbe_hw_stats stats;
+	struct work_struct reset_task;
+	struct mii_if_info mii;
+	struct timer_list watchdog_timer;
+	u32 wake_up_evt;
+	u32 *config_space;
+	unsigned long led_status;
+	struct pch_gbe_tx_ring *tx_ring;
+	struct pch_gbe_rx_ring *rx_ring;
+	unsigned long rx_buffer_len;
+	unsigned long tx_queue_len;
+	bool rx_csum;
+	bool tx_csum;
+	bool have_msi;
+};
+
+extern const char pch_driver_version[];
+
+/* pch_gbe_main.c */
+extern int pch_gbe_up(struct pch_gbe_adapter *adapter);
+extern void pch_gbe_down(struct pch_gbe_adapter *adapter);
+extern void pch_gbe_reinit_locked(struct pch_gbe_adapter *adapter);
+extern void pch_gbe_reset(struct pch_gbe_adapter *adapter);
+extern int pch_gbe_setup_tx_resources(struct pch_gbe_adapter *adapter,
+				       struct pch_gbe_tx_ring *txdr);
+extern int pch_gbe_setup_rx_resources(struct pch_gbe_adapter *adapter,
+				       struct pch_gbe_rx_ring *rxdr);
+extern void pch_gbe_free_tx_resources(struct pch_gbe_adapter *adapter,
+				       struct pch_gbe_tx_ring *tx_ring);
+extern void pch_gbe_free_rx_resources(struct pch_gbe_adapter *adapter,
+				       struct pch_gbe_rx_ring *rx_ring);
+extern void pch_gbe_update_stats(struct pch_gbe_adapter *adapter);
+extern int pch_gbe_mdio_read(struct net_device *netdev, int addr, int reg);
+extern void pch_gbe_mdio_write(struct net_device *netdev, int addr, int reg,
+				int data);
+/* pch_gbe_param.c */
+extern void pch_gbe_check_options(struct pch_gbe_adapter *adapter);
+
+/* pch_gbe_ethtool.c */
+extern void pch_gbe_set_ethtool_ops(struct net_device *netdev);
+
+/* pch_gbe_mac.c */
+extern s32 pch_gbe_mac_force_mac_fc(struct pch_gbe_hw *hw);
+extern s32 pch_gbe_mac_read_mac_addr(struct pch_gbe_hw *hw);
+extern u16 pch_gbe_mac_ctrl_miim(struct pch_gbe_hw *hw,
+				  u32 addr, u32 dir, u32 reg, u16 data);
+#endif /* _PCH_GBE_H_ */

drivers/net/pch_gbe/pch_gbe_api.c

···
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This code was derived from the Intel e1000e Linux driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include "pch_gbe.h"
+#include "pch_gbe_phy.h"
+
+/* bus type values */
+#define pch_gbe_bus_type_unknown	0
+#define pch_gbe_bus_type_pci		1
+#define pch_gbe_bus_type_pcix		2
+#define pch_gbe_bus_type_pci_express	3
+#define pch_gbe_bus_type_reserved	4
+
+/* bus speed values */
+#define pch_gbe_bus_speed_unknown	0
+#define pch_gbe_bus_speed_33		1
+#define pch_gbe_bus_speed_66		2
+#define pch_gbe_bus_speed_100		3
+#define pch_gbe_bus_speed_120		4
+#define pch_gbe_bus_speed_133		5
+#define pch_gbe_bus_speed_2500		6
+#define pch_gbe_bus_speed_reserved	7
+
+/* bus width values */
+#define pch_gbe_bus_width_unknown	0
+#define pch_gbe_bus_width_pcie_x1	1
+#define pch_gbe_bus_width_pcie_x2	2
+#define pch_gbe_bus_width_pcie_x4	4
+#define pch_gbe_bus_width_32		5
+#define pch_gbe_bus_width_64		6
+#define pch_gbe_bus_width_reserved	7
+
+/**
+ * pch_gbe_plat_get_bus_info - Obtain bus information for adapter
+ * @hw:	Pointer to the HW structure
+ */
+static void pch_gbe_plat_get_bus_info(struct pch_gbe_hw *hw)
+{
+	hw->bus.type  = pch_gbe_bus_type_pci_express;
+	hw->bus.speed = pch_gbe_bus_speed_2500;
+	hw->bus.width = pch_gbe_bus_width_pcie_x1;
+}
+
+/**
+ * pch_gbe_plat_init_hw - Initialize hardware
+ * @hw:	Pointer to the HW structure
+ * Returns
+ *	0:		Successfully
+ *	Negative value:	Failed-EBUSY
+ */
+static s32 pch_gbe_plat_init_hw(struct pch_gbe_hw *hw)
+{
+	s32 ret_val;
+
+	ret_val = pch_gbe_phy_get_id(hw);
+	if (ret_val) {
+		pr_err("pch_gbe_phy_get_id error\n");
+		return ret_val;
+	}
+	pch_gbe_phy_init_setting(hw);
+	/* Setup Mac interface option RGMII */
+#ifdef PCH_GBE_MAC_IFOP_RGMII
+	pch_gbe_phy_set_rgmii(hw);
+#endif
+	return ret_val;
+}
+
+static const struct pch_gbe_functions pch_gbe_ops = {
+	.get_bus_info      = pch_gbe_plat_get_bus_info,
+	.init_hw           = pch_gbe_plat_init_hw,
+	.read_phy_reg      = pch_gbe_phy_read_reg_miic,
+	.write_phy_reg     = pch_gbe_phy_write_reg_miic,
+	.reset_phy         = pch_gbe_phy_hw_reset,
+	.sw_reset_phy      = pch_gbe_phy_sw_reset,
+	.power_up_phy      = pch_gbe_phy_power_up,
+	.power_down_phy    = pch_gbe_phy_power_down,
+	.read_mac_addr     = pch_gbe_mac_read_mac_addr
+};
+
+/**
+ * pch_gbe_plat_init_function_pointers - Init func ptrs
+ * @hw:	Pointer to the HW structure
+ */
+void pch_gbe_plat_init_function_pointers(struct pch_gbe_hw *hw)
+{
+	/* Set PHY parameter */
+	hw->phy.reset_delay_us     = PCH_GBE_PHY_RESET_DELAY_US;
+	/* Set function pointers */
+	hw->func = &pch_gbe_ops;
+}
+
+/**
+ * pch_gbe_hal_setup_init_funcs - Initializes function pointers
+ * @hw:	Pointer to the HW structure
+ * Returns
+ *	0:	Successfully
+ *	ENOSYS:	Function is not registered
+ */
+inline s32 pch_gbe_hal_setup_init_funcs(struct pch_gbe_hw *hw)
+{
+	if (!hw->reg) {
+		pr_err("ERROR: Registers not mapped\n");
+		return -ENOSYS;
+	}
+	pch_gbe_plat_init_function_pointers(hw);
+	return 0;
+}
+
+/**
+ * pch_gbe_hal_get_bus_info - Obtain bus information for adapter
+ * @hw:	Pointer to the HW structure
+ */
+inline void pch_gbe_hal_get_bus_info(struct pch_gbe_hw *hw)
+{
+	if (!hw->func->get_bus_info)
+		pr_err("ERROR: configuration\n");
+	else
+		hw->func->get_bus_info(hw);
+}
+
+/**
+ * pch_gbe_hal_init_hw - Initialize hardware
+ * @hw:	Pointer to the HW structure
+ * Returns
+ *	0:	Successfully
+ *	ENOSYS:	Function is not registered
+ */
+inline s32 pch_gbe_hal_init_hw(struct pch_gbe_hw *hw)
+{
+	if (!hw->func->init_hw) {
+		pr_err("ERROR: configuration\n");
+		return -ENOSYS;
+	}
+	return hw->func->init_hw(hw);
+}
+
+/**
+ * pch_gbe_hal_read_phy_reg - Reads PHY register
+ * @hw:	    Pointer to the HW structure
+ * @offset: The register to read
+ * @data:   The buffer to store the 16-bit read.
+ * Returns
+ *	0:	Successfully
+ *	Negative value:	Failed
+ */
+inline s32 pch_gbe_hal_read_phy_reg(struct pch_gbe_hw *hw, u32 offset,
+					u16 *data)
+{
+	if (!hw->func->read_phy_reg)
+		return 0;
+	return hw->func->read_phy_reg(hw, offset, data);
+}
+
+/**
+ * pch_gbe_hal_write_phy_reg - Writes PHY register
+ * @hw:	    Pointer to the HW structure
+ * @offset: The register to read
+ * @data:   The value to write.
+ * Returns
+ *	0:	Successfully
+ *	Negative value:	Failed
+ */
+inline s32 pch_gbe_hal_write_phy_reg(struct pch_gbe_hw *hw, u32 offset,
+					u16 data)
+{
+	if (!hw->func->write_phy_reg)
+		return 0;
+	return hw->func->write_phy_reg(hw, offset, data);
+}
+
+/**
+ * pch_gbe_hal_phy_hw_reset - Hard PHY reset
+ * @hw:	    Pointer to the HW structure
+ */
+inline void pch_gbe_hal_phy_hw_reset(struct pch_gbe_hw *hw)
+{
+	if (!hw->func->reset_phy)
+		pr_err("ERROR: configuration\n");
+	else
+		hw->func->reset_phy(hw);
+}
+
+/**
+ * pch_gbe_hal_phy_sw_reset - Soft PHY reset
+ * @hw:	    Pointer to the HW structure
+ */
+inline void pch_gbe_hal_phy_sw_reset(struct pch_gbe_hw *hw)
+{
+	if (!hw->func->sw_reset_phy)
+		pr_err("ERROR: configuration\n");
+	else
+		hw->func->sw_reset_phy(hw);
+}
+
+/**
+ * pch_gbe_hal_read_mac_addr - Reads MAC address
+ * @hw:	Pointer to the HW structure
+ * Returns
+ *	0:	Successfully
+ *	ENOSYS:	Function is not registered
+ */
+inline s32 pch_gbe_hal_read_mac_addr(struct pch_gbe_hw *hw)
+{
+	if (!hw->func->read_mac_addr) {
+		pr_err("ERROR: configuration\n");
+		return -ENOSYS;
+	}
+	return hw->func->read_mac_addr(hw);
+}
+
+/**
+ * pch_gbe_hal_power_up_phy - Power up PHY
+ * @hw:	Pointer to the HW structure
+ */
+inline void pch_gbe_hal_power_up_phy(struct pch_gbe_hw *hw)
+{
+	if (hw->func->power_up_phy)
+		hw->func->power_up_phy(hw);
+}
+
+/**
+ * pch_gbe_hal_power_down_phy - Power down PHY
+ * @hw:	Pointer to the HW structure
+ */
+inline void pch_gbe_hal_power_down_phy(struct pch_gbe_hw *hw)
+{
+	if (hw->func->power_down_phy)
+		hw->func->power_down_phy(hw);
+}

drivers/net/pch_gbe/pch_gbe_api.h

···
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This code was derived from the Intel e1000e Linux driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+ */
+#ifndef _PCH_GBE_API_H_
+#define _PCH_GBE_API_H_
+
+#include "pch_gbe_phy.h"
+
+s32 pch_gbe_hal_setup_init_funcs(struct pch_gbe_hw *hw);
+void pch_gbe_hal_get_bus_info(struct pch_gbe_hw *hw);
+s32 pch_gbe_hal_init_hw(struct pch_gbe_hw *hw);
+s32 pch_gbe_hal_read_phy_reg(struct pch_gbe_hw *hw, u32 offset, u16 *data);
+s32 pch_gbe_hal_write_phy_reg(struct pch_gbe_hw *hw, u32 offset, u16 data);
+void pch_gbe_hal_phy_hw_reset(struct pch_gbe_hw *hw);
+void pch_gbe_hal_phy_sw_reset(struct pch_gbe_hw *hw);
+s32 pch_gbe_hal_read_mac_addr(struct pch_gbe_hw *hw);
+void pch_gbe_hal_power_up_phy(struct pch_gbe_hw *hw);
+void pch_gbe_hal_power_down_phy(struct pch_gbe_hw *hw);
+
+#endif

drivers/net/pch_gbe/pch_gbe_ethtool.c

···
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This code was derived from the Intel e1000e Linux driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include "pch_gbe.h"
+#include "pch_gbe_api.h"
+
+/**
+ * pch_gbe_stats - Stats item infomation
+ */
+struct pch_gbe_stats {
+	char string[ETH_GSTRING_LEN];
+	size_t size;
+	size_t offset;
+};
+
+#define PCH_GBE_STAT(m)						\
+{								\
+	.string = #m,						\
+	.size = FIELD_SIZEOF(struct pch_gbe_hw_stats, m),	\
+	.offset = offsetof(struct pch_gbe_hw_stats, m),		\
+}
+
+/**
+ * pch_gbe_gstrings_stats - ethtool information status name list
+ */
+static const struct pch_gbe_stats pch_gbe_gstrings_stats[] = {
+	PCH_GBE_STAT(rx_packets),
+	PCH_GBE_STAT(tx_packets),
+	PCH_GBE_STAT(rx_bytes),
+	PCH_GBE_STAT(tx_bytes),
+	PCH_GBE_STAT(rx_errors),
+	PCH_GBE_STAT(tx_errors),
+	PCH_GBE_STAT(rx_dropped),
+	PCH_GBE_STAT(tx_dropped),
+	PCH_GBE_STAT(multicast),
+	PCH_GBE_STAT(collisions),
+	PCH_GBE_STAT(rx_crc_errors),
+	PCH_GBE_STAT(rx_frame_errors),
+	PCH_GBE_STAT(rx_alloc_buff_failed),
+	PCH_GBE_STAT(tx_length_errors),
+	PCH_GBE_STAT(tx_aborted_errors),
+	PCH_GBE_STAT(tx_carrier_errors),
+	PCH_GBE_STAT(tx_timeout_count),
+	PCH_GBE_STAT(tx_restart_count),
+	PCH_GBE_STAT(intr_rx_dsc_empty_count),
+	PCH_GBE_STAT(intr_rx_frame_err_count),
+	PCH_GBE_STAT(intr_rx_fifo_err_count),
+	PCH_GBE_STAT(intr_rx_dma_err_count),
+	PCH_GBE_STAT(intr_tx_fifo_err_count),
+	PCH_GBE_STAT(intr_tx_dma_err_count),
+	PCH_GBE_STAT(intr_tcpip_err_count)
+};
+
+#define PCH_GBE_QUEUE_STATS_LEN 0
+#define PCH_GBE_GLOBAL_STATS_LEN	ARRAY_SIZE(pch_gbe_gstrings_stats)
+#define PCH_GBE_STATS_LEN (PCH_GBE_GLOBAL_STATS_LEN + PCH_GBE_QUEUE_STATS_LEN)
+
+#define PCH_GBE_MAC_REGS_LEN    (sizeof(struct pch_gbe_regs) / 4)
+#define PCH_GBE_REGS_LEN        (PCH_GBE_MAC_REGS_LEN + PCH_GBE_PHY_REGS_LEN)
+/**
+ * pch_gbe_get_settings - Get device-specific settings
+ * @netdev: Network interface device structure
+ * @ecmd:   Ethtool command
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+static int pch_gbe_get_settings(struct net_device *netdev,
+				 struct ethtool_cmd *ecmd)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	int ret;
+
+	ret = mii_ethtool_gset(&adapter->mii, ecmd);
+	ecmd->supported &= ~(SUPPORTED_TP | SUPPORTED_1000baseT_Half);
+	ecmd->advertising &= ~(ADVERTISED_TP | ADVERTISED_1000baseT_Half);
+
+	if (!netif_carrier_ok(adapter->netdev))
+		ecmd->speed = -1;
+	return ret;
+}
+
+/**
+ * pch_gbe_set_settings - Set device-specific settings
+ * @netdev: Network interface device structure
+ * @ecmd:   Ethtool command
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+static int pch_gbe_set_settings(struct net_device *netdev,
+				 struct ethtool_cmd *ecmd)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+	int ret;
+
+	pch_gbe_hal_write_phy_reg(hw, MII_BMCR, BMCR_RESET);
+
+	if (ecmd->speed == -1)
+		ecmd->speed = SPEED_1000;
+		ecmd->duplex = DUPLEX_FULL;
+	ret = mii_ethtool_sset(&adapter->mii, ecmd);
+	if (ret) {
+		pr_err("Error: mii_ethtool_sset\n");
+		return ret;
+	}
+	hw->mac.link_speed = ecmd->speed;
+	hw->mac.link_duplex = ecmd->duplex;
+	hw->phy.autoneg_advertised = ecmd->advertising;
+	hw->mac.autoneg = ecmd->autoneg;
+	pch_gbe_hal_phy_sw_reset(hw);
+
+	/* reset the link */
+	if (netif_running(adapter->netdev)) {
+		pch_gbe_down(adapter);
+		ret = pch_gbe_up(adapter);
+	} else {
+		pch_gbe_reset(adapter);
+	}
+	return ret;
+}
+
+/**
+ * pch_gbe_get_regs_len - Report the size of device registers
+ * @netdev: Network interface device structure
+ * Returns: the size of device registers.
+ */
+static int pch_gbe_get_regs_len(struct net_device *netdev)
+{
+	return PCH_GBE_REGS_LEN * (int)sizeof(u32);
+}
+
+/**
+ * pch_gbe_get_drvinfo - Report driver information
+ * @netdev:  Network interface device structure
+ * @drvinfo: Driver information structure
+ */
+static void pch_gbe_get_drvinfo(struct net_device *netdev,
+				 struct ethtool_drvinfo *drvinfo)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	strcpy(drvinfo->driver, KBUILD_MODNAME);
+	strcpy(drvinfo->version, pch_driver_version);
+	strcpy(drvinfo->fw_version, "N/A");
+	strcpy(drvinfo->bus_info, pci_name(adapter->pdev));
+	drvinfo->regdump_len = pch_gbe_get_regs_len(netdev);
+}
+
+/**
+ * pch_gbe_get_regs - Get device registers
+ * @netdev: Network interface device structure
+ * @regs:   Ethtool register structure
+ * @p:      Buffer pointer of read device register date
+ */
+static void pch_gbe_get_regs(struct net_device *netdev,
+				struct ethtool_regs *regs, void *p)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+	struct pci_dev *pdev = adapter->pdev;
+	u32 *regs_buff = p;
+	u16 i, tmp;
+
+	regs->version = 0x1000000 | (__u32)pdev->revision << 16 | pdev->device;
+	for (i = 0; i < PCH_GBE_MAC_REGS_LEN; i++)
+		*regs_buff++ = ioread32(&hw->reg->INT_ST + i);
+	/* PHY register */
+	for (i = 0; i < PCH_GBE_PHY_REGS_LEN; i++) {
+		pch_gbe_hal_read_phy_reg(&adapter->hw, i, &tmp);
+		*regs_buff++ = tmp;
+	}
+}
+
+/**
+ * pch_gbe_get_wol - Report whether Wake-on-Lan is enabled
+ * @netdev: Network interface device structure
+ * @wol:    Wake-on-Lan information
+ */
+static void pch_gbe_get_wol(struct net_device *netdev,
+				struct ethtool_wolinfo *wol)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	wol->supported = WAKE_UCAST | WAKE_MCAST | WAKE_BCAST | WAKE_MAGIC;
+	wol->wolopts = 0;
+
+	if ((adapter->wake_up_evt & PCH_GBE_WLC_IND))
+		wol->wolopts |= WAKE_UCAST;
+	if ((adapter->wake_up_evt & PCH_GBE_WLC_MLT))
+		wol->wolopts |= WAKE_MCAST;
+	if ((adapter->wake_up_evt & PCH_GBE_WLC_BR))
+		wol->wolopts |= WAKE_BCAST;
+	if ((adapter->wake_up_evt & PCH_GBE_WLC_MP))
+		wol->wolopts |= WAKE_MAGIC;
+}
+
+/**
+ * pch_gbe_set_wol - Turn Wake-on-Lan on or off
+ * @netdev: Network interface device structure
+ * @wol:    Pointer of wake-on-Lan information straucture
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+static int pch_gbe_set_wol(struct net_device *netdev,
+				struct ethtool_wolinfo *wol)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	if ((wol->wolopts & (WAKE_PHY | WAKE_ARP | WAKE_MAGICSECURE)))
+		return -EOPNOTSUPP;
+	/* these settings will always override what we currently have */
+	adapter->wake_up_evt = 0;
+
+	if ((wol->wolopts & WAKE_UCAST))
+		adapter->wake_up_evt |= PCH_GBE_WLC_IND;
+	if ((wol->wolopts & WAKE_MCAST))
+		adapter->wake_up_evt |= PCH_GBE_WLC_MLT;
+	if ((wol->wolopts & WAKE_BCAST))
+		adapter->wake_up_evt |= PCH_GBE_WLC_BR;
+	if ((wol->wolopts & WAKE_MAGIC))
+		adapter->wake_up_evt |= PCH_GBE_WLC_MP;
+	return 0;
+}
+
+/**
+ * pch_gbe_nway_reset - Restart autonegotiation
+ * @netdev: Network interface device structure
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+static int pch_gbe_nway_reset(struct net_device *netdev)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	return mii_nway_restart(&adapter->mii);
+}
+
+/**
+ * pch_gbe_get_ringparam - Report ring sizes
+ * @netdev:  Network interface device structure
+ * @ring:    Ring param structure
+ */
+static void pch_gbe_get_ringparam(struct net_device *netdev,
+					struct ethtool_ringparam *ring)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_tx_ring *txdr = adapter->tx_ring;
+	struct pch_gbe_rx_ring *rxdr = adapter->rx_ring;
+
+	ring->rx_max_pending = PCH_GBE_MAX_RXD;
+	ring->tx_max_pending = PCH_GBE_MAX_TXD;
+	ring->rx_mini_max_pending = 0;
+	ring->rx_jumbo_max_pending = 0;
+	ring->rx_pending = rxdr->count;
+	ring->tx_pending = txdr->count;
+	ring->rx_mini_pending = 0;
+	ring->rx_jumbo_pending = 0;
+}
+
+/**
+ * pch_gbe_set_ringparam - Set ring sizes
+ * @netdev:  Network interface device structure
+ * @ring:    Ring param structure
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+static int pch_gbe_set_ringparam(struct net_device *netdev,
+					struct ethtool_ringparam *ring)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_tx_ring *txdr, *tx_old;
+	struct pch_gbe_rx_ring *rxdr, *rx_old;
+	int tx_ring_size, rx_ring_size;
+	int err = 0;
+
+	if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
+		return -EINVAL;
+	tx_ring_size = (int)sizeof(struct pch_gbe_tx_ring);
+	rx_ring_size = (int)sizeof(struct pch_gbe_rx_ring);
+
+	if ((netif_running(adapter->netdev)))
+		pch_gbe_down(adapter);
+	tx_old = adapter->tx_ring;
+	rx_old = adapter->rx_ring;
+
+	txdr = kzalloc(tx_ring_size, GFP_KERNEL);
+	if (!txdr) {
+		err = -ENOMEM;
+		goto err_alloc_tx;
+	}
+	rxdr = kzalloc(rx_ring_size, GFP_KERNEL);
+	if (!rxdr) {
+		err = -ENOMEM;
+		goto err_alloc_rx;
+	}
+	adapter->tx_ring = txdr;
+	adapter->rx_ring = rxdr;
+
+	rxdr->count =
+		clamp_val(ring->rx_pending, PCH_GBE_MIN_RXD, PCH_GBE_MAX_RXD);
+	rxdr->count = roundup(rxdr->count, PCH_GBE_RX_DESC_MULTIPLE);
+
+	txdr->count =
+		clamp_val(ring->tx_pending, PCH_GBE_MIN_RXD, PCH_GBE_MAX_RXD);
+	txdr->count = roundup(txdr->count, PCH_GBE_TX_DESC_MULTIPLE);
+
+	if ((netif_running(adapter->netdev))) {
+		/* Try to get new resources before deleting old */
+		err = pch_gbe_setup_rx_resources(adapter, adapter->rx_ring);
+		if (err)
+			goto err_setup_rx;
+		err = pch_gbe_setup_tx_resources(adapter, adapter->tx_ring);
+		if (err)
+			goto err_setup_tx;
+		/* save the new, restore the old in order to free it,
+		 * then restore the new back again */
+#ifdef RINGFREE
+		adapter->rx_ring = rx_old;
+		adapter->tx_ring = tx_old;
+		pch_gbe_free_rx_resources(adapter, adapter->rx_ring);
+		pch_gbe_free_tx_resources(adapter, adapter->tx_ring);
+		kfree(tx_old);
+		kfree(rx_old);
+		adapter->rx_ring = rxdr;
+		adapter->tx_ring = txdr;
+#else
+		pch_gbe_free_rx_resources(adapter, rx_old);
+		pch_gbe_free_tx_resources(adapter, tx_old);
+		kfree(tx_old);
+		kfree(rx_old);
+		adapter->rx_ring = rxdr;
+		adapter->tx_ring = txdr;
+#endif
+		err = pch_gbe_up(adapter);
+	}
+	return err;
+
+err_setup_tx:
+	pch_gbe_free_rx_resources(adapter, adapter->rx_ring);
+err_setup_rx:
+	adapter->rx_ring = rx_old;
+	adapter->tx_ring = tx_old;
+	kfree(rxdr);
+err_alloc_rx:
+	kfree(txdr);
+err_alloc_tx:
+	if (netif_running(adapter->netdev))
+		pch_gbe_up(adapter);
+	return err;
+}
+
+/**
+ * pch_gbe_get_pauseparam - Report pause parameters
+ * @netdev:  Network interface device structure
+ * @pause:   Pause parameters structure
+ */
+static void pch_gbe_get_pauseparam(struct net_device *netdev,
+				       struct ethtool_pauseparam *pause)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+
+	pause->autoneg =
+	    ((hw->mac.fc_autoneg) ? AUTONEG_ENABLE : AUTONEG_DISABLE);
+
+	if (hw->mac.fc == PCH_GBE_FC_RX_PAUSE) {
+		pause->rx_pause = 1;
+	} else if (hw->mac.fc == PCH_GBE_FC_TX_PAUSE) {
+		pause->tx_pause = 1;
+	} else if (hw->mac.fc == PCH_GBE_FC_FULL) {
+		pause->rx_pause = 1;
+		pause->tx_pause = 1;
+	}
+}
+
+/**
+ * pch_gbe_set_pauseparam - Set pause paramters
+ * @netdev:  Network interface device structure
+ * @pause:   Pause parameters structure
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+static int pch_gbe_set_pauseparam(struct net_device *netdev,
+				       struct ethtool_pauseparam *pause)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+	int ret = 0;
+
+	hw->mac.fc_autoneg = pause->autoneg;
+	if ((pause->rx_pause) && (pause->tx_pause))
+		hw->mac.fc = PCH_GBE_FC_FULL;
+	else if ((pause->rx_pause) && (!pause->tx_pause))
+		hw->mac.fc = PCH_GBE_FC_RX_PAUSE;
+	else if ((!pause->rx_pause) && (pause->tx_pause))
+		hw->mac.fc = PCH_GBE_FC_TX_PAUSE;
+	else if ((!pause->rx_pause) && (!pause->tx_pause))
+		hw->mac.fc = PCH_GBE_FC_NONE;
+
+	if (hw->mac.fc_autoneg == AUTONEG_ENABLE) {
+		if ((netif_running(adapter->netdev))) {
+			pch_gbe_down(adapter);
+			ret = pch_gbe_up(adapter);
+		} else {
+			pch_gbe_reset(adapter);
+		}
+	} else {
+		ret = pch_gbe_mac_force_mac_fc(hw);
+	}
+	return ret;
+}
+
+/**
+ * pch_gbe_get_rx_csum - Report whether receive checksums are turned on or off
+ * @netdev:  Network interface device structure
+ * Returns
+ *	true(1):  Checksum On
+ *	false(0): Checksum Off
+ */
+static u32 pch_gbe_get_rx_csum(struct net_device *netdev)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	return adapter->rx_csum;
+}
+
+/**
+ * pch_gbe_set_rx_csum - Turn receive checksum on or off
+ * @netdev:  Network interface device structure
+ * @data:    Checksum On[true] or Off[false]
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+static int pch_gbe_set_rx_csum(struct net_device *netdev, u32 data)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	adapter->rx_csum = data;
+	if ((netif_running(netdev)))
+		pch_gbe_reinit_locked(adapter);
+	else
+		pch_gbe_reset(adapter);
+
+	return 0;
+}
+
+/**
+ * pch_gbe_get_tx_csum - Report whether transmit checksums are turned on or off
+ * @netdev:  Network interface device structure
+ * Returns
+ *	true(1):  Checksum On
+ *	false(0): Checksum Off
+ */
+static u32 pch_gbe_get_tx_csum(struct net_device *netdev)
+{
+	return (netdev->features & NETIF_F_HW_CSUM) != 0;
+}
+
+/**
+ * pch_gbe_set_tx_csum - Turn transmit checksums on or off
+ * @netdev: Network interface device structure
+ * @data:   Checksum on[true] or off[false]
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+static int pch_gbe_set_tx_csum(struct net_device *netdev, u32 data)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	adapter->tx_csum = data;
+	if (data)
+		netdev->features |= NETIF_F_HW_CSUM;
+	else
+		netdev->features &= ~NETIF_F_HW_CSUM;
+	return 0;
+}
+
+/**
+ * pch_gbe_get_strings - Return a set of strings that describe the requested
+ *			 objects
+ * @netdev:    Network interface device structure
+ * @stringset: Select the stringset. [ETH_SS_TEST] [ETH_SS_STATS]
+ * @data:      Pointer of read string data.
+ */
+static void pch_gbe_get_strings(struct net_device *netdev, u32 stringset,
+					u8 *data)
+{
+	u8 *p = data;
+	int i;
+
+	switch (stringset) {
+	case (u32) ETH_SS_STATS:
+		for (i = 0; i < PCH_GBE_GLOBAL_STATS_LEN; i++) {
+			memcpy(p, pch_gbe_gstrings_stats[i].string,
+			       ETH_GSTRING_LEN);
+			p += ETH_GSTRING_LEN;
+		}
+		break;
+	}
+}
+
+/**
+ * pch_gbe_get_ethtool_stats - Return statistics about the device
+ * @netdev: Network interface device structure
+ * @stats:  Ethtool statue structure
+ * @data:   Pointer of read status area
+ */
+static void pch_gbe_get_ethtool_stats(struct net_device *netdev,
+				  struct ethtool_stats *stats, u64 *data)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	int i;
+	const struct pch_gbe_stats *gstats = pch_gbe_gstrings_stats;
+	char *hw_stats = (char *)&adapter->stats;
+
+	pch_gbe_update_stats(adapter);
+	for (i = 0; i < PCH_GBE_GLOBAL_STATS_LEN; i++) {
+		char *p = hw_stats + gstats->offset;
+		data[i] = gstats->size == sizeof(u64) ? *(u64 *)p:(*(u32 *)p);
+		gstats++;
+	}
+}
+
+static int pch_gbe_get_sset_count(struct net_device *netdev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return PCH_GBE_STATS_LEN;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static const struct ethtool_ops pch_gbe_ethtool_ops = {
+	.get_settings = pch_gbe_get_settings,
+	.set_settings = pch_gbe_set_settings,
+	.get_drvinfo = pch_gbe_get_drvinfo,
+	.get_regs_len = pch_gbe_get_regs_len,
+	.get_regs = pch_gbe_get_regs,
+	.get_wol = pch_gbe_get_wol,
+	.set_wol = pch_gbe_set_wol,
+	.nway_reset = pch_gbe_nway_reset,
+	.get_link = ethtool_op_get_link,
+	.get_ringparam = pch_gbe_get_ringparam,
+	.set_ringparam = pch_gbe_set_ringparam,
+	.get_pauseparam = pch_gbe_get_pauseparam,
+	.set_pauseparam = pch_gbe_set_pauseparam,
+	.get_rx_csum = pch_gbe_get_rx_csum,
+	.set_rx_csum = pch_gbe_set_rx_csum,
+	.get_tx_csum = pch_gbe_get_tx_csum,
+	.set_tx_csum = pch_gbe_set_tx_csum,
+	.get_strings = pch_gbe_get_strings,
+	.get_ethtool_stats = pch_gbe_get_ethtool_stats,
+	.get_sset_count = pch_gbe_get_sset_count,
+};
+
+void pch_gbe_set_ethtool_ops(struct net_device *netdev)
+{
+	SET_ETHTOOL_OPS(netdev, &pch_gbe_ethtool_ops);
+}

drivers/net/pch_gbe/pch_gbe_main.c

···
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This code was derived from the Intel e1000e Linux driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include "pch_gbe.h"
+#include "pch_gbe_api.h"
+
+#define DRV_VERSION     "1.00"
+const char pch_driver_version[] = DRV_VERSION;
+
+#define PCI_DEVICE_ID_INTEL_IOH1_GBE	0x8802		/* Pci device ID */
+#define PCH_GBE_MAR_ENTRIES		16
+#define PCH_GBE_SHORT_PKT		64
+#define DSC_INIT16			0xC000
+#define PCH_GBE_DMA_ALIGN		0
+#define PCH_GBE_WATCHDOG_PERIOD		(1 * HZ)	/* watchdog time */
+#define PCH_GBE_COPYBREAK_DEFAULT	256
+#define PCH_GBE_PCI_BAR			1
+
+#define PCH_GBE_TX_WEIGHT         64
+#define PCH_GBE_RX_WEIGHT         64
+#define PCH_GBE_RX_BUFFER_WRITE   16
+
+/* Initialize the wake-on-LAN settings */
+#define PCH_GBE_WL_INIT_SETTING    (PCH_GBE_WLC_MP)
+
+#define PCH_GBE_MAC_RGMII_CTRL_SETTING ( \
+	PCH_GBE_CHIP_TYPE_INTERNAL | \
+	PCH_GBE_RGMII_MODE_RGMII   | \
+	PCH_GBE_CRS_SEL              \
+	)
+
+/* Ethertype field values */
+#define PCH_GBE_MAX_JUMBO_FRAME_SIZE    10318
+#define PCH_GBE_FRAME_SIZE_2048         2048
+#define PCH_GBE_FRAME_SIZE_4096         4096
+#define PCH_GBE_FRAME_SIZE_8192         8192
+
+#define PCH_GBE_GET_DESC(R, i, type)    (&(((struct type *)((R).desc))[i]))
+#define PCH_GBE_RX_DESC(R, i)           PCH_GBE_GET_DESC(R, i, pch_gbe_rx_desc)
+#define PCH_GBE_TX_DESC(R, i)           PCH_GBE_GET_DESC(R, i, pch_gbe_tx_desc)
+#define PCH_GBE_DESC_UNUSED(R) \
+	((((R)->next_to_clean > (R)->next_to_use) ? 0 : (R)->count) + \
+	(R)->next_to_clean - (R)->next_to_use - 1)
+
+/* Pause packet value */
+#define	PCH_GBE_PAUSE_PKT1_VALUE    0x00C28001
+#define	PCH_GBE_PAUSE_PKT2_VALUE    0x00000100
+#define	PCH_GBE_PAUSE_PKT4_VALUE    0x01000888
+#define	PCH_GBE_PAUSE_PKT5_VALUE    0x0000FFFF
+
+#define PCH_GBE_ETH_ALEN            6
+
+/* This defines the bits that are set in the Interrupt Mask
+ * Set/Read Register.  Each bit is documented below:
+ *   o RXT0   = Receiver Timer Interrupt (ring 0)
+ *   o TXDW   = Transmit Descriptor Written Back
+ *   o RXDMT0 = Receive Descriptor Minimum Threshold hit (ring 0)
+ *   o RXSEQ  = Receive Sequence Error
+ *   o LSC    = Link Status Change
+ */
+#define PCH_GBE_INT_ENABLE_MASK ( \
+	PCH_GBE_INT_RX_DMA_CMPLT |    \
+	PCH_GBE_INT_RX_DSC_EMP   |    \
+	PCH_GBE_INT_WOL_DET      |    \
+	PCH_GBE_INT_TX_CMPLT          \
+	)
+
+
+static unsigned int copybreak __read_mostly = PCH_GBE_COPYBREAK_DEFAULT;
+
+/**
+ * pch_gbe_mac_read_mac_addr - Read MAC address
+ * @hw:	            Pointer to the HW structure
+ * Returns
+ *	0:			Successful.
+ */
+s32 pch_gbe_mac_read_mac_addr(struct pch_gbe_hw *hw)
+{
+	u32  adr1a, adr1b;
+
+	adr1a = ioread32(&hw->reg->mac_adr[0].high);
+	adr1b = ioread32(&hw->reg->mac_adr[0].low);
+
+	hw->mac.addr[0] = (u8)(adr1a & 0xFF);
+	hw->mac.addr[1] = (u8)((adr1a >> 8) & 0xFF);
+	hw->mac.addr[2] = (u8)((adr1a >> 16) & 0xFF);
+	hw->mac.addr[3] = (u8)((adr1a >> 24) & 0xFF);
+	hw->mac.addr[4] = (u8)(adr1b & 0xFF);
+	hw->mac.addr[5] = (u8)((adr1b >> 8) & 0xFF);
+
+	pr_debug("hw->mac.addr : %pM\n", hw->mac.addr);
+	return 0;
+}
+
+/**
+ * pch_gbe_wait_clr_bit - Wait to clear a bit
+ * @reg:	Pointer of register
+ * @busy:	Busy bit
+ */
+void pch_gbe_wait_clr_bit(void *reg, u32 bit)
+{
+	u32 tmp;
+	/* wait busy */
+	tmp = 1000;
+	while ((ioread32(reg) & bit) && --tmp)
+		cpu_relax();
+	if (!tmp)
+		pr_err("Error: busy bit is not cleared\n");
+}
+/**
+ * pch_gbe_mac_mar_set - Set MAC address register
+ * @hw:	    Pointer to the HW structure
+ * @addr:   Pointer to the MAC address
+ * @index:  MAC address array register
+ */
+void pch_gbe_mac_mar_set(struct pch_gbe_hw *hw, u8 * addr, u32 index)
+{
+	u32 mar_low, mar_high, adrmask;
+
+	pr_debug("index : 0x%x\n", index);
+
+	/*
+	 * HW expects these in little endian so we reverse the byte order
+	 * from network order (big endian) to little endian
+	 */
+	mar_high = ((u32) addr[0] | ((u32) addr[1] << 8) |
+		   ((u32) addr[2] << 16) | ((u32) addr[3] << 24));
+	mar_low = ((u32) addr[4] | ((u32) addr[5] << 8));
+	/* Stop the MAC Address of index. */
+	adrmask = ioread32(&hw->reg->ADDR_MASK);
+	iowrite32((adrmask | (0x0001 << index)), &hw->reg->ADDR_MASK);
+	/* wait busy */
+	pch_gbe_wait_clr_bit(&hw->reg->ADDR_MASK, PCH_GBE_BUSY);
+	/* Set the MAC address to the MAC address 1A/1B register */
+	iowrite32(mar_high, &hw->reg->mac_adr[index].high);
+	iowrite32(mar_low, &hw->reg->mac_adr[index].low);
+	/* Start the MAC address of index */
+	iowrite32((adrmask & ~(0x0001 << index)), &hw->reg->ADDR_MASK);
+	/* wait busy */
+	pch_gbe_wait_clr_bit(&hw->reg->ADDR_MASK, PCH_GBE_BUSY);
+}
+
+/**
+ * pch_gbe_mac_reset_hw - Reset hardware
+ * @hw:	Pointer to the HW structure
+ */
+void pch_gbe_mac_reset_hw(struct pch_gbe_hw *hw)
+{
+	/* Read the MAC address. and store to the private data */
+	pch_gbe_mac_read_mac_addr(hw);
+	iowrite32(PCH_GBE_ALL_RST, &hw->reg->RESET);
+#ifdef PCH_GBE_MAC_IFOP_RGMII
+	iowrite32(PCH_GBE_MODE_GMII_ETHER, &hw->reg->MODE);
+#endif
+	pch_gbe_wait_clr_bit(&hw->reg->RESET, PCH_GBE_ALL_RST);
+	/* Setup the receive address */
+	pch_gbe_mac_mar_set(hw, hw->mac.addr, 0);
+	return;
+}
+
+/**
+ * pch_gbe_mac_init_rx_addrs - Initialize receive address's
+ * @hw:	Pointer to the HW structure
+ * @mar_count: Receive address registers
+ */
+void pch_gbe_mac_init_rx_addrs(struct pch_gbe_hw *hw, u16 mar_count)
+{
+	u32 i;
+
+	/* Setup the receive address */
+	pch_gbe_mac_mar_set(hw, hw->mac.addr, 0);
+
+	/* Zero out the other receive addresses */
+	for (i = 1; i < mar_count; i++) {
+		iowrite32(0, &hw->reg->mac_adr[i].high);
+		iowrite32(0, &hw->reg->mac_adr[i].low);
+	}
+	iowrite32(0xFFFE, &hw->reg->ADDR_MASK);
+	/* wait busy */
+	pch_gbe_wait_clr_bit(&hw->reg->ADDR_MASK, PCH_GBE_BUSY);
+}
+
+
+/**
+ * pch_gbe_mac_mc_addr_list_update - Update Multicast addresses
+ * @hw:	            Pointer to the HW structure
+ * @mc_addr_list:   Array of multicast addresses to program
+ * @mc_addr_count:  Number of multicast addresses to program
+ * @mar_used_count: The first MAC Address register free to program
+ * @mar_total_num:  Total number of supported MAC Address Registers
+ */
+void pch_gbe_mac_mc_addr_list_update(struct pch_gbe_hw *hw,
+				     u8 *mc_addr_list, u32 mc_addr_count,
+				     u32 mar_used_count, u32 mar_total_num)
+{
+	u32 i, adrmask;
+
+	/* Load the first set of multicast addresses into the exact
+	 * filters (RAR).  If there are not enough to fill the RAR
+	 * array, clear the filters.
+	 */
+	for (i = mar_used_count; i < mar_total_num; i++) {
+		if (mc_addr_count) {
+			pch_gbe_mac_mar_set(hw, mc_addr_list, i);
+			mc_addr_count--;
+			mc_addr_list += PCH_GBE_ETH_ALEN;
+		} else {
+			/* Clear MAC address mask */
+			adrmask = ioread32(&hw->reg->ADDR_MASK);
+			iowrite32((adrmask | (0x0001 << i)),
+					&hw->reg->ADDR_MASK);
+			/* wait busy */
+			pch_gbe_wait_clr_bit(&hw->reg->ADDR_MASK, PCH_GBE_BUSY);
+			/* Clear MAC address */
+			iowrite32(0, &hw->reg->mac_adr[i].high);
+			iowrite32(0, &hw->reg->mac_adr[i].low);
+		}
+	}
+}
+
+/**
+ * pch_gbe_mac_force_mac_fc - Force the MAC's flow control settings
+ * @hw:	            Pointer to the HW structure
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+s32 pch_gbe_mac_force_mac_fc(struct pch_gbe_hw *hw)
+{
+	struct pch_gbe_mac_info *mac = &hw->mac;
+	u32 rx_fctrl;
+
+	pr_debug("mac->fc = %u\n", mac->fc);
+
+	rx_fctrl = ioread32(&hw->reg->RX_FCTRL);
+
+	switch (mac->fc) {
+	case PCH_GBE_FC_NONE:
+		rx_fctrl &= ~PCH_GBE_FL_CTRL_EN;
+		mac->tx_fc_enable = false;
+		break;
+	case PCH_GBE_FC_RX_PAUSE:
+		rx_fctrl |= PCH_GBE_FL_CTRL_EN;
+		mac->tx_fc_enable = false;
+		break;
+	case PCH_GBE_FC_TX_PAUSE:
+		rx_fctrl &= ~PCH_GBE_FL_CTRL_EN;
+		mac->tx_fc_enable = true;
+		break;
+	case PCH_GBE_FC_FULL:
+		rx_fctrl |= PCH_GBE_FL_CTRL_EN;
+		mac->tx_fc_enable = true;
+		break;
+	default:
+		pr_err("Flow control param set incorrectly\n");
+		return -EINVAL;
+	}
+	if (mac->link_duplex == DUPLEX_HALF)
+		rx_fctrl &= ~PCH_GBE_FL_CTRL_EN;
+	iowrite32(rx_fctrl, &hw->reg->RX_FCTRL);
+	pr_debug("RX_FCTRL reg : 0x%08x  mac->tx_fc_enable : %d\n",
+		 ioread32(&hw->reg->RX_FCTRL), mac->tx_fc_enable);
+	return 0;
+}
+
+/**
+ * pch_gbe_mac_set_wol_event - Set wake-on-lan event
+ * @hw:     Pointer to the HW structure
+ * @wu_evt: Wake up event
+ */
+void pch_gbe_mac_set_wol_event(struct pch_gbe_hw *hw, u32 wu_evt)
+{
+	u32 addr_mask;
+
+	pr_debug("wu_evt : 0x%08x  ADDR_MASK reg : 0x%08x\n",
+		 wu_evt, ioread32(&hw->reg->ADDR_MASK));
+
+	if (wu_evt) {
+		/* Set Wake-On-Lan address mask */
+		addr_mask = ioread32(&hw->reg->ADDR_MASK);
+		iowrite32(addr_mask, &hw->reg->WOL_ADDR_MASK);
+		/* wait busy */
+		pch_gbe_wait_clr_bit(&hw->reg->WOL_ADDR_MASK, PCH_GBE_WLA_BUSY);
+		iowrite32(0, &hw->reg->WOL_ST);
+		iowrite32((wu_evt | PCH_GBE_WLC_WOL_MODE), &hw->reg->WOL_CTRL);
+		iowrite32(0x02, &hw->reg->TCPIP_ACC);
+		iowrite32(PCH_GBE_INT_ENABLE_MASK, &hw->reg->INT_EN);
+	} else {
+		iowrite32(0, &hw->reg->WOL_CTRL);
+		iowrite32(0, &hw->reg->WOL_ST);
+	}
+	return;
+}
+
+/**
+ * pch_gbe_mac_ctrl_miim - Control MIIM interface
+ * @hw:   Pointer to the HW structure
+ * @addr: Address of PHY
+ * @dir:  Operetion. (Write or Read)
+ * @reg:  Access register of PHY
+ * @data: Write data.
+ *
+ * Returns: Read date.
+ */
+u16 pch_gbe_mac_ctrl_miim(struct pch_gbe_hw *hw, u32 addr, u32 dir, u32 reg,
+			u16 data)
+{
+	u32 data_out = 0;
+	unsigned int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&hw->miim_lock, flags);
+
+	for (i = 100; i; --i) {
+		if ((ioread32(&hw->reg->MIIM) & PCH_GBE_MIIM_OPER_READY))
+			break;
+		udelay(20);
+	}
+	if (i == 0) {
+		pr_err("pch-gbe.miim won't go Ready\n");
+		spin_unlock_irqrestore(&hw->miim_lock, flags);
+		return 0;	/* No way to indicate timeout error */
+	}
+	iowrite32(((reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) |
+		  (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) |
+		  dir | data), &hw->reg->MIIM);
+	for (i = 0; i < 100; i++) {
+		udelay(20);
+		data_out = ioread32(&hw->reg->MIIM);
+		if ((data_out & PCH_GBE_MIIM_OPER_READY))
+			break;
+	}
+	spin_unlock_irqrestore(&hw->miim_lock, flags);
+
+	pr_debug("PHY %s: reg=%d, data=0x%04X\n",
+		 dir == PCH_GBE_MIIM_OPER_READ ? "READ" : "WRITE", reg,
+		 dir == PCH_GBE_MIIM_OPER_READ ? data_out : data);
+	return (u16) data_out;
+}
+
+/**
+ * pch_gbe_mac_set_pause_packet - Set pause packet
+ * @hw:   Pointer to the HW structure
+ */
+void pch_gbe_mac_set_pause_packet(struct pch_gbe_hw *hw)
+{
+	unsigned long tmp2, tmp3;
+
+	/* Set Pause packet */
+	tmp2 = hw->mac.addr[1];
+	tmp2 = (tmp2 << 8) | hw->mac.addr[0];
+	tmp2 = PCH_GBE_PAUSE_PKT2_VALUE | (tmp2 << 16);
+
+	tmp3 = hw->mac.addr[5];
+	tmp3 = (tmp3 << 8) | hw->mac.addr[4];
+	tmp3 = (tmp3 << 8) | hw->mac.addr[3];
+	tmp3 = (tmp3 << 8) | hw->mac.addr[2];
+
+	iowrite32(PCH_GBE_PAUSE_PKT1_VALUE, &hw->reg->PAUSE_PKT1);
+	iowrite32(tmp2, &hw->reg->PAUSE_PKT2);
+	iowrite32(tmp3, &hw->reg->PAUSE_PKT3);
+	iowrite32(PCH_GBE_PAUSE_PKT4_VALUE, &hw->reg->PAUSE_PKT4);
+	iowrite32(PCH_GBE_PAUSE_PKT5_VALUE, &hw->reg->PAUSE_PKT5);
+
+	/* Transmit Pause Packet */
+	iowrite32(PCH_GBE_PS_PKT_RQ, &hw->reg->PAUSE_REQ);
+
+	pr_debug("PAUSE_PKT1-5 reg : 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",
+		 ioread32(&hw->reg->PAUSE_PKT1), ioread32(&hw->reg->PAUSE_PKT2),
+		 ioread32(&hw->reg->PAUSE_PKT3), ioread32(&hw->reg->PAUSE_PKT4),
+		 ioread32(&hw->reg->PAUSE_PKT5));
+
+	return;
+}
+
+
+/**
+ * pch_gbe_alloc_queues - Allocate memory for all rings
+ * @adapter:  Board private structure to initialize
+ * Returns
+ *	0:	Successfully
+ *	Negative value:	Failed
+ */
+static int pch_gbe_alloc_queues(struct pch_gbe_adapter *adapter)
+{
+	int size;
+
+	size = (int)sizeof(struct pch_gbe_tx_ring);
+	adapter->tx_ring = kzalloc(size, GFP_KERNEL);
+	if (!adapter->tx_ring)
+		return -ENOMEM;
+	size = (int)sizeof(struct pch_gbe_rx_ring);
+	adapter->rx_ring = kzalloc(size, GFP_KERNEL);
+	if (!adapter->rx_ring) {
+		kfree(adapter->tx_ring);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+/**
+ * pch_gbe_init_stats - Initialize status
+ * @adapter:  Board private structure to initialize
+ */
+static void pch_gbe_init_stats(struct pch_gbe_adapter *adapter)
+{
+	memset(&adapter->stats, 0, sizeof(adapter->stats));
+	return;
+}
+
+/**
+ * pch_gbe_init_phy - Initialize PHY
+ * @adapter:  Board private structure to initialize
+ * Returns
+ *	0:	Successfully
+ *	Negative value:	Failed
+ */
+static int pch_gbe_init_phy(struct pch_gbe_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	u32 addr;
+	u16 bmcr, stat;
+
+	/* Discover phy addr by searching addrs in order {1,0,2,..., 31} */
+	for (addr = 0; addr < PCH_GBE_PHY_REGS_LEN; addr++) {
+		adapter->mii.phy_id = (addr == 0) ? 1 : (addr == 1) ? 0 : addr;
+		bmcr = pch_gbe_mdio_read(netdev, adapter->mii.phy_id, MII_BMCR);
+		stat = pch_gbe_mdio_read(netdev, adapter->mii.phy_id, MII_BMSR);
+		stat = pch_gbe_mdio_read(netdev, adapter->mii.phy_id, MII_BMSR);
+		if (!((bmcr == 0xFFFF) || ((stat == 0) && (bmcr == 0))))
+			break;
+	}
+	adapter->hw.phy.addr = adapter->mii.phy_id;
+	pr_debug("phy_addr = %d\n", adapter->mii.phy_id);
+	if (addr == 32)
+		return -EAGAIN;
+	/* Selected the phy and isolate the rest */
+	for (addr = 0; addr < PCH_GBE_PHY_REGS_LEN; addr++) {
+		if (addr != adapter->mii.phy_id) {
+			pch_gbe_mdio_write(netdev, addr, MII_BMCR,
+					   BMCR_ISOLATE);
+		} else {
+			bmcr = pch_gbe_mdio_read(netdev, addr, MII_BMCR);
+			pch_gbe_mdio_write(netdev, addr, MII_BMCR,
+					   bmcr & ~BMCR_ISOLATE);
+		}
+	}
+
+	/* MII setup */
+	adapter->mii.phy_id_mask = 0x1F;
+	adapter->mii.reg_num_mask = 0x1F;
+	adapter->mii.dev = adapter->netdev;
+	adapter->mii.mdio_read = pch_gbe_mdio_read;
+	adapter->mii.mdio_write = pch_gbe_mdio_write;
+	adapter->mii.supports_gmii = mii_check_gmii_support(&adapter->mii);
+	return 0;
+}
+
+/**
+ * pch_gbe_mdio_read - The read function for mii
+ * @netdev: Network interface device structure
+ * @addr:   Phy ID
+ * @reg:    Access location
+ * Returns
+ *	0:	Successfully
+ *	Negative value:	Failed
+ */
+int pch_gbe_mdio_read(struct net_device *netdev, int addr, int reg)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+
+	return pch_gbe_mac_ctrl_miim(hw, addr, PCH_GBE_HAL_MIIM_READ, reg,
+				     (u16) 0);
+}
+
+/**
+ * pch_gbe_mdio_write - The write function for mii
+ * @netdev: Network interface device structure
+ * @addr:   Phy ID (not used)
+ * @reg:    Access location
+ * @data:   Write data
+ */
+void pch_gbe_mdio_write(struct net_device *netdev, int addr, int reg, int data)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+
+	pch_gbe_mac_ctrl_miim(hw, addr, PCH_GBE_HAL_MIIM_WRITE, reg, data);
+}
+
+/**
+ * pch_gbe_reset_task - Reset processing at the time of transmission timeout
+ * @work:  Pointer of board private structure
+ */
+static void pch_gbe_reset_task(struct work_struct *work)
+{
+	struct pch_gbe_adapter *adapter;
+	adapter = container_of(work, struct pch_gbe_adapter, reset_task);
+
+	pch_gbe_reinit_locked(adapter);
+}
+
+/**
+ * pch_gbe_reinit_locked- Re-initialization
+ * @adapter:  Board private structure
+ */
+void pch_gbe_reinit_locked(struct pch_gbe_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+
+	rtnl_lock();
+	if (netif_running(netdev)) {
+		pch_gbe_down(adapter);
+		pch_gbe_up(adapter);
+	}
+	rtnl_unlock();
+}
+
+/**
+ * pch_gbe_reset - Reset GbE
+ * @adapter:  Board private structure
+ */
+void pch_gbe_reset(struct pch_gbe_adapter *adapter)
+{
+	pch_gbe_mac_reset_hw(&adapter->hw);
+	/* Setup the receive address. */
+	pch_gbe_mac_init_rx_addrs(&adapter->hw, PCH_GBE_MAR_ENTRIES);
+	if (pch_gbe_hal_init_hw(&adapter->hw))
+		pr_err("Hardware Error\n");
+}
+
+/**
+ * pch_gbe_free_irq - Free an interrupt
+ * @adapter:  Board private structure
+ */
+static void pch_gbe_free_irq(struct pch_gbe_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+
+	free_irq(adapter->pdev->irq, netdev);
+	if (adapter->have_msi) {
+		pci_disable_msi(adapter->pdev);
+		pr_debug("call pci_disable_msi\n");
+	}
+}
+
+/**
+ * pch_gbe_irq_disable - Mask off interrupt generation on the NIC
+ * @adapter:  Board private structure
+ */
+static void pch_gbe_irq_disable(struct pch_gbe_adapter *adapter)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+
+	atomic_inc(&adapter->irq_sem);
+	iowrite32(0, &hw->reg->INT_EN);
+	ioread32(&hw->reg->INT_ST);
+	synchronize_irq(adapter->pdev->irq);
+
+	pr_debug("INT_EN reg : 0x%08x\n", ioread32(&hw->reg->INT_EN));
+}
+
+/**
+ * pch_gbe_irq_enable - Enable default interrupt generation settings
+ * @adapter:  Board private structure
+ */
+static void pch_gbe_irq_enable(struct pch_gbe_adapter *adapter)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+
+	if (likely(atomic_dec_and_test(&adapter->irq_sem)))
+		iowrite32(PCH_GBE_INT_ENABLE_MASK, &hw->reg->INT_EN);
+	ioread32(&hw->reg->INT_ST);
+	pr_debug("INT_EN reg : 0x%08x\n", ioread32(&hw->reg->INT_EN));
+}
+
+
+
+/**
+ * pch_gbe_setup_tctl - configure the Transmit control registers
+ * @adapter:  Board private structure
+ */
+static void pch_gbe_setup_tctl(struct pch_gbe_adapter *adapter)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	u32 tx_mode, tcpip;
+
+	tx_mode = PCH_GBE_TM_LONG_PKT |
+		PCH_GBE_TM_ST_AND_FD |
+		PCH_GBE_TM_SHORT_PKT |
+		PCH_GBE_TM_TH_TX_STRT_8 |
+		PCH_GBE_TM_TH_ALM_EMP_4 | PCH_GBE_TM_TH_ALM_FULL_8;
+
+	iowrite32(tx_mode, &hw->reg->TX_MODE);
+
+	tcpip = ioread32(&hw->reg->TCPIP_ACC);
+	tcpip |= PCH_GBE_TX_TCPIPACC_EN;
+	iowrite32(tcpip, &hw->reg->TCPIP_ACC);
+	return;
+}
+
+/**
+ * pch_gbe_configure_tx - Configure Transmit Unit after Reset
+ * @adapter:  Board private structure
+ */
+static void pch_gbe_configure_tx(struct pch_gbe_adapter *adapter)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	u32 tdba, tdlen, dctrl;
+
+	pr_debug("dma addr = 0x%08llx  size = 0x%08x\n",
+		 (unsigned long long)adapter->tx_ring->dma,
+		 adapter->tx_ring->size);
+
+	/* Setup the HW Tx Head and Tail descriptor pointers */
+	tdba = adapter->tx_ring->dma;
+	tdlen = adapter->tx_ring->size - 0x10;
+	iowrite32(tdba, &hw->reg->TX_DSC_BASE);
+	iowrite32(tdlen, &hw->reg->TX_DSC_SIZE);
+	iowrite32(tdba, &hw->reg->TX_DSC_SW_P);
+
+	/* Enables Transmission DMA */
+	dctrl = ioread32(&hw->reg->DMA_CTRL);
+	dctrl |= PCH_GBE_TX_DMA_EN;
+	iowrite32(dctrl, &hw->reg->DMA_CTRL);
+}
+
+/**
+ * pch_gbe_setup_rctl - Configure the receive control registers
+ * @adapter:  Board private structure
+ */
+static void pch_gbe_setup_rctl(struct pch_gbe_adapter *adapter)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	u32 rx_mode, tcpip;
+
+	rx_mode = PCH_GBE_ADD_FIL_EN | PCH_GBE_MLT_FIL_EN |
+	PCH_GBE_RH_ALM_EMP_4 | PCH_GBE_RH_ALM_FULL_4 | PCH_GBE_RH_RD_TRG_8;
+
+	iowrite32(rx_mode, &hw->reg->RX_MODE);
+
+	tcpip = ioread32(&hw->reg->TCPIP_ACC);
+
+	if (adapter->rx_csum) {
+		tcpip &= ~PCH_GBE_RX_TCPIPACC_OFF;
+		tcpip |= PCH_GBE_RX_TCPIPACC_EN;
+	} else {
+		tcpip |= PCH_GBE_RX_TCPIPACC_OFF;
+		tcpip &= ~PCH_GBE_RX_TCPIPACC_EN;
+	}
+	iowrite32(tcpip, &hw->reg->TCPIP_ACC);
+	return;
+}
+
+/**
+ * pch_gbe_configure_rx - Configure Receive Unit after Reset
+ * @adapter:  Board private structure
+ */
+static void pch_gbe_configure_rx(struct pch_gbe_adapter *adapter)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	u32 rdba, rdlen, rctl, rxdma;
+
+	pr_debug("dma adr = 0x%08llx  size = 0x%08x\n",
+		 (unsigned long long)adapter->rx_ring->dma,
+		 adapter->rx_ring->size);
+
+	pch_gbe_mac_force_mac_fc(hw);
+
+	/* Disables Receive MAC */
+	rctl = ioread32(&hw->reg->MAC_RX_EN);
+	iowrite32((rctl & ~PCH_GBE_MRE_MAC_RX_EN), &hw->reg->MAC_RX_EN);
+
+	/* Disables Receive DMA */
+	rxdma = ioread32(&hw->reg->DMA_CTRL);
+	rxdma &= ~PCH_GBE_RX_DMA_EN;
+	iowrite32(rxdma, &hw->reg->DMA_CTRL);
+
+	pr_debug("MAC_RX_EN reg = 0x%08x  DMA_CTRL reg = 0x%08x\n",
+		 ioread32(&hw->reg->MAC_RX_EN),
+		 ioread32(&hw->reg->DMA_CTRL));
+
+	/* Setup the HW Rx Head and Tail Descriptor Pointers and
+	 * the Base and Length of the Rx Descriptor Ring */
+	rdba = adapter->rx_ring->dma;
+	rdlen = adapter->rx_ring->size - 0x10;
+	iowrite32(rdba, &hw->reg->RX_DSC_BASE);
+	iowrite32(rdlen, &hw->reg->RX_DSC_SIZE);
+	iowrite32((rdba + rdlen), &hw->reg->RX_DSC_SW_P);
+
+	/* Enables Receive DMA */
+	rxdma = ioread32(&hw->reg->DMA_CTRL);
+	rxdma |= PCH_GBE_RX_DMA_EN;
+	iowrite32(rxdma, &hw->reg->DMA_CTRL);
+	/* Enables Receive */
+	iowrite32(PCH_GBE_MRE_MAC_RX_EN, &hw->reg->MAC_RX_EN);
+}
+
+/**
+ * pch_gbe_unmap_and_free_tx_resource - Unmap and free tx socket buffer
+ * @adapter:     Board private structure
+ * @buffer_info: Buffer information structure
+ */
+static void pch_gbe_unmap_and_free_tx_resource(
+	struct pch_gbe_adapter *adapter, struct pch_gbe_buffer *buffer_info)
+{
+	if (buffer_info->mapped) {
+		dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
+				 buffer_info->length, DMA_TO_DEVICE);
+		buffer_info->mapped = false;
+	}
+	if (buffer_info->skb) {
+		dev_kfree_skb_any(buffer_info->skb);
+		buffer_info->skb = NULL;
+	}
+}
+
+/**
+ * pch_gbe_unmap_and_free_rx_resource - Unmap and free rx socket buffer
+ * @adapter:      Board private structure
+ * @buffer_info:  Buffer information structure
+ */
+static void pch_gbe_unmap_and_free_rx_resource(
+					struct pch_gbe_adapter *adapter,
+					struct pch_gbe_buffer *buffer_info)
+{
+	if (buffer_info->mapped) {
+		dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
+				 buffer_info->length, DMA_FROM_DEVICE);
+		buffer_info->mapped = false;
+	}
+	if (buffer_info->skb) {
+		dev_kfree_skb_any(buffer_info->skb);
+		buffer_info->skb = NULL;
+	}
+}
+
+/**
+ * pch_gbe_clean_tx_ring - Free Tx Buffers
+ * @adapter:  Board private structure
+ * @tx_ring:  Ring to be cleaned
+ */
+static void pch_gbe_clean_tx_ring(struct pch_gbe_adapter *adapter,
+				   struct pch_gbe_tx_ring *tx_ring)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	struct pch_gbe_buffer *buffer_info;
+	unsigned long size;
+	unsigned int i;
+
+	/* Free all the Tx ring sk_buffs */
+	for (i = 0; i < tx_ring->count; i++) {
+		buffer_info = &tx_ring->buffer_info[i];
+		pch_gbe_unmap_and_free_tx_resource(adapter, buffer_info);
+	}
+	pr_debug("call pch_gbe_unmap_and_free_tx_resource() %d count\n", i);
+
+	size = (unsigned long)sizeof(struct pch_gbe_buffer) * tx_ring->count;
+	memset(tx_ring->buffer_info, 0, size);
+
+	/* Zero out the descriptor ring */
+	memset(tx_ring->desc, 0, tx_ring->size);
+	tx_ring->next_to_use = 0;
+	tx_ring->next_to_clean = 0;
+	iowrite32(tx_ring->dma, &hw->reg->TX_DSC_HW_P);
+	iowrite32((tx_ring->size - 0x10), &hw->reg->TX_DSC_SIZE);
+}
+
+/**
+ * pch_gbe_clean_rx_ring - Free Rx Buffers
+ * @adapter:  Board private structure
+ * @rx_ring:  Ring to free buffers from
+ */
+static void
+pch_gbe_clean_rx_ring(struct pch_gbe_adapter *adapter,
+		      struct pch_gbe_rx_ring *rx_ring)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	struct pch_gbe_buffer *buffer_info;
+	unsigned long size;
+	unsigned int i;
+
+	/* Free all the Rx ring sk_buffs */
+	for (i = 0; i < rx_ring->count; i++) {
+		buffer_info = &rx_ring->buffer_info[i];
+		pch_gbe_unmap_and_free_rx_resource(adapter, buffer_info);
+	}
+	pr_debug("call pch_gbe_unmap_and_free_rx_resource() %d count\n", i);
+	size = (unsigned long)sizeof(struct pch_gbe_buffer) * rx_ring->count;
+	memset(rx_ring->buffer_info, 0, size);
+
+	/* Zero out the descriptor ring */
+	memset(rx_ring->desc, 0, rx_ring->size);
+	rx_ring->next_to_clean = 0;
+	rx_ring->next_to_use = 0;
+	iowrite32(rx_ring->dma, &hw->reg->RX_DSC_HW_P);
+	iowrite32((rx_ring->size - 0x10), &hw->reg->RX_DSC_SIZE);
+}
+
+static void pch_gbe_set_rgmii_ctrl(struct pch_gbe_adapter *adapter, u16 speed,
+				    u16 duplex)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	unsigned long rgmii = 0;
+
+	/* Set the RGMII control. */
+#ifdef PCH_GBE_MAC_IFOP_RGMII
+	switch (speed) {
+	case SPEED_10:
+		rgmii = (PCH_GBE_RGMII_RATE_2_5M |
+			 PCH_GBE_MAC_RGMII_CTRL_SETTING);
+		break;
+	case SPEED_100:
+		rgmii = (PCH_GBE_RGMII_RATE_25M |
+			 PCH_GBE_MAC_RGMII_CTRL_SETTING);
+		break;
+	case SPEED_1000:
+		rgmii = (PCH_GBE_RGMII_RATE_125M |
+			 PCH_GBE_MAC_RGMII_CTRL_SETTING);
+		break;
+	}
+	iowrite32(rgmii, &hw->reg->RGMII_CTRL);
+#else	/* GMII */
+	rgmii = 0;
+	iowrite32(rgmii, &hw->reg->RGMII_CTRL);
+#endif
+}
+static void pch_gbe_set_mode(struct pch_gbe_adapter *adapter, u16 speed,
+			      u16 duplex)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct pch_gbe_hw *hw = &adapter->hw;
+	unsigned long mode = 0;
+
+	/* Set the communication mode */
+	switch (speed) {
+	case SPEED_10:
+		mode = PCH_GBE_MODE_MII_ETHER;
+		netdev->tx_queue_len = 10;
+		break;
+	case SPEED_100:
+		mode = PCH_GBE_MODE_MII_ETHER;
+		netdev->tx_queue_len = 100;
+		break;
+	case SPEED_1000:
+		mode = PCH_GBE_MODE_GMII_ETHER;
+		break;
+	}
+	if (duplex == DUPLEX_FULL)
+		mode |= PCH_GBE_MODE_FULL_DUPLEX;
+	else
+		mode |= PCH_GBE_MODE_HALF_DUPLEX;
+	iowrite32(mode, &hw->reg->MODE);
+}
+
+/**
+ * pch_gbe_watchdog - Watchdog process
+ * @data:  Board private structure
+ */
+static void pch_gbe_watchdog(unsigned long data)
+{
+	struct pch_gbe_adapter *adapter = (struct pch_gbe_adapter *)data;
+	struct net_device *netdev = adapter->netdev;
+	struct pch_gbe_hw *hw = &adapter->hw;
+	struct ethtool_cmd cmd;
+
+	pr_debug("right now = %ld\n", jiffies);
+
+	pch_gbe_update_stats(adapter);
+	if ((mii_link_ok(&adapter->mii)) && (!netif_carrier_ok(netdev))) {
+		netdev->tx_queue_len = adapter->tx_queue_len;
+		/* mii library handles link maintenance tasks */
+		if (mii_ethtool_gset(&adapter->mii, &cmd)) {
+			pr_err("ethtool get setting Error\n");
+			mod_timer(&adapter->watchdog_timer,
+				  round_jiffies(jiffies +
+						PCH_GBE_WATCHDOG_PERIOD));
+			return;
+		}
+		hw->mac.link_speed = cmd.speed;
+		hw->mac.link_duplex = cmd.duplex;
+		/* Set the RGMII control. */
+		pch_gbe_set_rgmii_ctrl(adapter, hw->mac.link_speed,
+						hw->mac.link_duplex);
+		/* Set the communication mode */
+		pch_gbe_set_mode(adapter, hw->mac.link_speed,
+				 hw->mac.link_duplex);
+		netdev_dbg(netdev,
+			   "Link is Up %d Mbps %s-Duplex\n",
+			   cmd.speed,
+			   cmd.duplex == DUPLEX_FULL ? "Full" : "Half");
+		netif_carrier_on(netdev);
+		netif_wake_queue(netdev);
+	} else if ((!mii_link_ok(&adapter->mii)) &&
+		   (netif_carrier_ok(netdev))) {
+		netdev_dbg(netdev, "NIC Link is Down\n");
+		hw->mac.link_speed = SPEED_10;
+		hw->mac.link_duplex = DUPLEX_HALF;
+		netif_carrier_off(netdev);
+		netif_stop_queue(netdev);
+	}
+	mod_timer(&adapter->watchdog_timer,
+		  round_jiffies(jiffies + PCH_GBE_WATCHDOG_PERIOD));
+}
+
+/**
+ * pch_gbe_tx_queue - Carry out queuing of the transmission data
+ * @adapter:  Board private structure
+ * @tx_ring:  Tx descriptor ring structure
+ * @skb:      Sockt buffer structure
+ */
+static void pch_gbe_tx_queue(struct pch_gbe_adapter *adapter,
+			      struct pch_gbe_tx_ring *tx_ring,
+			      struct sk_buff *skb)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	struct pch_gbe_tx_desc *tx_desc;
+	struct pch_gbe_buffer *buffer_info;
+	struct sk_buff *tmp_skb;
+	unsigned int frame_ctrl;
+	unsigned int ring_num;
+	unsigned long flags;
+
+	/*-- Set frame control --*/
+	frame_ctrl = 0;
+	if (unlikely(skb->len < PCH_GBE_SHORT_PKT))
+		frame_ctrl |= PCH_GBE_TXD_CTRL_APAD;
+	if (unlikely(!adapter->tx_csum))
+		frame_ctrl |= PCH_GBE_TXD_CTRL_TCPIP_ACC_OFF;
+
+	/* Performs checksum processing */
+	/*
+	 * It is because the hardware accelerator does not support a checksum,
+	 * when the received data size is less than 64 bytes.
+	 */
+	if ((skb->len < PCH_GBE_SHORT_PKT) && (adapter->tx_csum)) {
+		frame_ctrl |= PCH_GBE_TXD_CTRL_APAD |
+			      PCH_GBE_TXD_CTRL_TCPIP_ACC_OFF;
+		if (skb->protocol == htons(ETH_P_IP)) {
+			struct iphdr *iph = ip_hdr(skb);
+			unsigned int offset;
+			iph->check = 0;
+			iph->check = ip_fast_csum((u8 *) iph, iph->ihl);
+			offset = skb_transport_offset(skb);
+			if (iph->protocol == IPPROTO_TCP) {
+				skb->csum = 0;
+				tcp_hdr(skb)->check = 0;
+				skb->csum = skb_checksum(skb, offset,
+							 skb->len - offset, 0);
+				tcp_hdr(skb)->check =
+					csum_tcpudp_magic(iph->saddr,
+							  iph->daddr,
+							  skb->len - offset,
+							  IPPROTO_TCP,
+							  skb->csum);
+			} else if (iph->protocol == IPPROTO_UDP) {
+				skb->csum = 0;
+				udp_hdr(skb)->check = 0;
+				skb->csum =
+					skb_checksum(skb, offset,
+						     skb->len - offset, 0);
+				udp_hdr(skb)->check =
+					csum_tcpudp_magic(iph->saddr,
+							  iph->daddr,
+							  skb->len - offset,
+							  IPPROTO_UDP,
+							  skb->csum);
+			}
+		}
+	}
+	spin_lock_irqsave(&tx_ring->tx_lock, flags);
+	ring_num = tx_ring->next_to_use;
+	if (unlikely((ring_num + 1) == tx_ring->count))
+		tx_ring->next_to_use = 0;
+	else
+		tx_ring->next_to_use = ring_num + 1;
+
+	spin_unlock_irqrestore(&tx_ring->tx_lock, flags);
+	buffer_info = &tx_ring->buffer_info[ring_num];
+	tmp_skb = buffer_info->skb;
+
+	/* [Header:14][payload] ---> [Header:14][paddong:2][payload]    */
+	memcpy(tmp_skb->data, skb->data, ETH_HLEN);
+	tmp_skb->data[ETH_HLEN] = 0x00;
+	tmp_skb->data[ETH_HLEN + 1] = 0x00;
+	tmp_skb->len = skb->len;
+	memcpy(&tmp_skb->data[ETH_HLEN + 2], &skb->data[ETH_HLEN],
+	       (skb->len - ETH_HLEN));
+	/*-- Set Buffer infomation --*/
+	buffer_info->length = tmp_skb->len;
+	buffer_info->dma = dma_map_single(&adapter->pdev->dev, tmp_skb->data,
+					  buffer_info->length,
+					  DMA_TO_DEVICE);
+	if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma)) {
+		pr_err("TX DMA map failed\n");
+		buffer_info->dma = 0;
+		buffer_info->time_stamp = 0;
+		tx_ring->next_to_use = ring_num;
+		return;
+	}
+	buffer_info->mapped = true;
+	buffer_info->time_stamp = jiffies;
+
+	/*-- Set Tx descriptor --*/
+	tx_desc = PCH_GBE_TX_DESC(*tx_ring, ring_num);
+	tx_desc->buffer_addr = (buffer_info->dma);
+	tx_desc->length = (tmp_skb->len);
+	tx_desc->tx_words_eob = ((tmp_skb->len + 3));
+	tx_desc->tx_frame_ctrl = (frame_ctrl);
+	tx_desc->gbec_status = (DSC_INIT16);
+
+	if (unlikely(++ring_num == tx_ring->count))
+		ring_num = 0;
+
+	/* Update software pointer of TX descriptor */
+	iowrite32(tx_ring->dma +
+		  (int)sizeof(struct pch_gbe_tx_desc) * ring_num,
+		  &hw->reg->TX_DSC_SW_P);
+	dev_kfree_skb_any(skb);
+}
+
+/**
+ * pch_gbe_update_stats - Update the board statistics counters
+ * @adapter:  Board private structure
+ */
+void pch_gbe_update_stats(struct pch_gbe_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev *pdev = adapter->pdev;
+	struct pch_gbe_hw_stats *stats = &adapter->stats;
+	unsigned long flags;
+
+	/*
+	 * Prevent stats update while adapter is being reset, or if the pci
+	 * connection is down.
+	 */
+	if ((pdev->error_state) && (pdev->error_state != pci_channel_io_normal))
+		return;
+
+	spin_lock_irqsave(&adapter->stats_lock, flags);
+
+	/* Update device status "adapter->stats" */
+	stats->rx_errors = stats->rx_crc_errors + stats->rx_frame_errors;
+	stats->tx_errors = stats->tx_length_errors +
+	    stats->tx_aborted_errors +
+	    stats->tx_carrier_errors + stats->tx_timeout_count;
+
+	/* Update network device status "adapter->net_stats" */
+	netdev->stats.rx_packets = stats->rx_packets;
+	netdev->stats.rx_bytes = stats->rx_bytes;
+	netdev->stats.rx_dropped = stats->rx_dropped;
+	netdev->stats.tx_packets = stats->tx_packets;
+	netdev->stats.tx_bytes = stats->tx_bytes;
+	netdev->stats.tx_dropped = stats->tx_dropped;
+	/* Fill out the OS statistics structure */
+	netdev->stats.multicast = stats->multicast;
+	netdev->stats.collisions = stats->collisions;
+	/* Rx Errors */
+	netdev->stats.rx_errors = stats->rx_errors;
+	netdev->stats.rx_crc_errors = stats->rx_crc_errors;
+	netdev->stats.rx_frame_errors = stats->rx_frame_errors;
+	/* Tx Errors */
+	netdev->stats.tx_errors = stats->tx_errors;
+	netdev->stats.tx_aborted_errors = stats->tx_aborted_errors;
+	netdev->stats.tx_carrier_errors = stats->tx_carrier_errors;
+
+	spin_unlock_irqrestore(&adapter->stats_lock, flags);
+}
+
+/**
+ * pch_gbe_intr - Interrupt Handler
+ * @irq:   Interrupt number
+ * @data:  Pointer to a network interface device structure
+ * Returns
+ *	- IRQ_HANDLED:	Our interrupt
+ *	- IRQ_NONE:	Not our interrupt
+ */
+static irqreturn_t pch_gbe_intr(int irq, void *data)
+{
+	struct net_device *netdev = data;
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+	u32 int_st;
+	u32 int_en;
+
+	/* Check request status */
+	int_st = ioread32(&hw->reg->INT_ST);
+	int_st = int_st & ioread32(&hw->reg->INT_EN);
+	/* When request status is no interruption factor */
+	if (unlikely(!int_st))
+		return IRQ_NONE;	/* Not our interrupt. End processing. */
+	pr_debug("%s occur int_st = 0x%08x\n", __func__, int_st);
+	if (int_st & PCH_GBE_INT_RX_FRAME_ERR)
+		adapter->stats.intr_rx_frame_err_count++;
+	if (int_st & PCH_GBE_INT_RX_FIFO_ERR)
+		adapter->stats.intr_rx_fifo_err_count++;
+	if (int_st & PCH_GBE_INT_RX_DMA_ERR)
+		adapter->stats.intr_rx_dma_err_count++;
+	if (int_st & PCH_GBE_INT_TX_FIFO_ERR)
+		adapter->stats.intr_tx_fifo_err_count++;
+	if (int_st & PCH_GBE_INT_TX_DMA_ERR)
+		adapter->stats.intr_tx_dma_err_count++;
+	if (int_st & PCH_GBE_INT_TCPIP_ERR)
+		adapter->stats.intr_tcpip_err_count++;
+	/* When Rx descriptor is empty  */
+	if ((int_st & PCH_GBE_INT_RX_DSC_EMP)) {
+		adapter->stats.intr_rx_dsc_empty_count++;
+		pr_err("Rx descriptor is empty\n");
+		int_en = ioread32(&hw->reg->INT_EN);
+		iowrite32((int_en & ~PCH_GBE_INT_RX_DSC_EMP), &hw->reg->INT_EN);
+		if (hw->mac.tx_fc_enable) {
+			/* Set Pause packet */
+			pch_gbe_mac_set_pause_packet(hw);
+		}
+		if ((int_en & (PCH_GBE_INT_RX_DMA_CMPLT | PCH_GBE_INT_TX_CMPLT))
+		    == 0) {
+			return IRQ_HANDLED;
+		}
+	}
+
+	/* When request status is Receive interruption */
+	if ((int_st & (PCH_GBE_INT_RX_DMA_CMPLT | PCH_GBE_INT_TX_CMPLT))) {
+		if (likely(napi_schedule_prep(&adapter->napi))) {
+			/* Enable only Rx Descriptor empty */
+			atomic_inc(&adapter->irq_sem);
+			int_en = ioread32(&hw->reg->INT_EN);
+			int_en &=
+			    ~(PCH_GBE_INT_RX_DMA_CMPLT | PCH_GBE_INT_TX_CMPLT);
+			iowrite32(int_en, &hw->reg->INT_EN);
+			/* Start polling for NAPI */
+			__napi_schedule(&adapter->napi);
+		}
+	}
+	pr_debug("return = 0x%08x  INT_EN reg = 0x%08x\n",
+		 IRQ_HANDLED, ioread32(&hw->reg->INT_EN));
+	return IRQ_HANDLED;
+}
+
+/**
+ * pch_gbe_alloc_rx_buffers - Replace used receive buffers; legacy & extended
+ * @adapter:       Board private structure
+ * @rx_ring:       Rx descriptor ring
+ * @cleaned_count: Cleaned count
+ */
+static void
+pch_gbe_alloc_rx_buffers(struct pch_gbe_adapter *adapter,
+			 struct pch_gbe_rx_ring *rx_ring, int cleaned_count)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev *pdev = adapter->pdev;
+	struct pch_gbe_hw *hw = &adapter->hw;
+	struct pch_gbe_rx_desc *rx_desc;
+	struct pch_gbe_buffer *buffer_info;
+	struct sk_buff *skb;
+	unsigned int i;
+	unsigned int bufsz;
+
+	bufsz = adapter->rx_buffer_len + PCH_GBE_DMA_ALIGN;
+	i = rx_ring->next_to_use;
+
+	while ((cleaned_count--)) {
+		buffer_info = &rx_ring->buffer_info[i];
+		skb = buffer_info->skb;
+		if (skb) {
+			skb_trim(skb, 0);
+		} else {
+			skb = netdev_alloc_skb(netdev, bufsz);
+			if (unlikely(!skb)) {
+				/* Better luck next round */
+				adapter->stats.rx_alloc_buff_failed++;
+				break;
+			}
+			/* 64byte align */
+			skb_reserve(skb, PCH_GBE_DMA_ALIGN);
+
+			buffer_info->skb = skb;
+			buffer_info->length = adapter->rx_buffer_len;
+		}
+		buffer_info->dma = dma_map_single(&pdev->dev,
+						  skb->data,
+						  buffer_info->length,
+						  DMA_FROM_DEVICE);
+		if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma)) {
+			dev_kfree_skb(skb);
+			buffer_info->skb = NULL;
+			buffer_info->dma = 0;
+			adapter->stats.rx_alloc_buff_failed++;
+			break; /* while !buffer_info->skb */
+		}
+		buffer_info->mapped = true;
+		rx_desc = PCH_GBE_RX_DESC(*rx_ring, i);
+		rx_desc->buffer_addr = (buffer_info->dma);
+		rx_desc->gbec_status = DSC_INIT16;
+
+		pr_debug("i = %d  buffer_info->dma = 0x08%llx  buffer_info->length = 0x%x\n",
+			 i, (unsigned long long)buffer_info->dma,
+			 buffer_info->length);
+
+		if (unlikely(++i == rx_ring->count))
+			i = 0;
+	}
+	if (likely(rx_ring->next_to_use != i)) {
+		rx_ring->next_to_use = i;
+		if (unlikely(i-- == 0))
+			i = (rx_ring->count - 1);
+		iowrite32(rx_ring->dma +
+			  (int)sizeof(struct pch_gbe_rx_desc) * i,
+			  &hw->reg->RX_DSC_SW_P);
+	}
+	return;
+}
+
+/**
+ * pch_gbe_alloc_tx_buffers - Allocate transmit buffers
+ * @adapter:   Board private structure
+ * @tx_ring:   Tx descriptor ring
+ */
+static void pch_gbe_alloc_tx_buffers(struct pch_gbe_adapter *adapter,
+					struct pch_gbe_tx_ring *tx_ring)
+{
+	struct pch_gbe_buffer *buffer_info;
+	struct sk_buff *skb;
+	unsigned int i;
+	unsigned int bufsz;
+	struct pch_gbe_tx_desc *tx_desc;
+
+	bufsz =
+	    adapter->hw.mac.max_frame_size + PCH_GBE_DMA_ALIGN + NET_IP_ALIGN;
+
+	for (i = 0; i < tx_ring->count; i++) {
+		buffer_info = &tx_ring->buffer_info[i];
+		skb = netdev_alloc_skb(adapter->netdev, bufsz);
+		skb_reserve(skb, PCH_GBE_DMA_ALIGN);
+		buffer_info->skb = skb;
+		tx_desc = PCH_GBE_TX_DESC(*tx_ring, i);
+		tx_desc->gbec_status = (DSC_INIT16);
+	}
+	return;
+}
+
+/**
+ * pch_gbe_clean_tx - Reclaim resources after transmit completes
+ * @adapter:   Board private structure
+ * @tx_ring:   Tx descriptor ring
+ * Returns
+ *	true:  Cleaned the descriptor
+ *	false: Not cleaned the descriptor
+ */
+static bool
+pch_gbe_clean_tx(struct pch_gbe_adapter *adapter,
+		 struct pch_gbe_tx_ring *tx_ring)
+{
+	struct pch_gbe_tx_desc *tx_desc;
+	struct pch_gbe_buffer *buffer_info;
+	struct sk_buff *skb;
+	unsigned int i;
+	unsigned int cleaned_count = 0;
+	bool cleaned = false;
+
+	pr_debug("next_to_clean : %d\n", tx_ring->next_to_clean);
+
+	i = tx_ring->next_to_clean;
+	tx_desc = PCH_GBE_TX_DESC(*tx_ring, i);
+	pr_debug("gbec_status:0x%04x  dma_status:0x%04x\n",
+		 tx_desc->gbec_status, tx_desc->dma_status);
+
+	while ((tx_desc->gbec_status & DSC_INIT16) == 0x0000) {
+		pr_debug("gbec_status:0x%04x\n", tx_desc->gbec_status);
+		cleaned = true;
+		buffer_info = &tx_ring->buffer_info[i];
+		skb = buffer_info->skb;
+
+		if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_ABT)) {
+			adapter->stats.tx_aborted_errors++;
+			pr_err("Transfer Abort Error\n");
+		} else if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_CRSER)
+			  ) {
+			adapter->stats.tx_carrier_errors++;
+			pr_err("Transfer Carrier Sense Error\n");
+		} else if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_EXCOL)
+			  ) {
+			adapter->stats.tx_aborted_errors++;
+			pr_err("Transfer Collision Abort Error\n");
+		} else if ((tx_desc->gbec_status &
+			    (PCH_GBE_TXD_GMAC_STAT_SNGCOL |
+			     PCH_GBE_TXD_GMAC_STAT_MLTCOL))) {
+			adapter->stats.collisions++;
+			adapter->stats.tx_packets++;
+			adapter->stats.tx_bytes += skb->len;
+			pr_debug("Transfer Collision\n");
+		} else if ((tx_desc->gbec_status & PCH_GBE_TXD_GMAC_STAT_CMPLT)
+			  ) {
+			adapter->stats.tx_packets++;
+			adapter->stats.tx_bytes += skb->len;
+		}
+		if (buffer_info->mapped) {
+			pr_debug("unmap buffer_info->dma : %d\n", i);
+			dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
+					 buffer_info->length, DMA_TO_DEVICE);
+			buffer_info->mapped = false;
+		}
+		if (buffer_info->skb) {
+			pr_debug("trim buffer_info->skb : %d\n", i);
+			skb_trim(buffer_info->skb, 0);
+		}
+		tx_desc->gbec_status = DSC_INIT16;
+		if (unlikely(++i == tx_ring->count))
+			i = 0;
+		tx_desc = PCH_GBE_TX_DESC(*tx_ring, i);
+
+		/* weight of a sort for tx, to avoid endless transmit cleanup */
+		if (cleaned_count++ == PCH_GBE_TX_WEIGHT)
+			break;
+	}
+	pr_debug("called pch_gbe_unmap_and_free_tx_resource() %d count\n",
+		 cleaned_count);
+	/* Recover from running out of Tx resources in xmit_frame */
+	if (unlikely(cleaned && (netif_queue_stopped(adapter->netdev)))) {
+		netif_wake_queue(adapter->netdev);
+		adapter->stats.tx_restart_count++;
+		pr_debug("Tx wake queue\n");
+	}
+	spin_lock(&adapter->tx_queue_lock);
+	tx_ring->next_to_clean = i;
+	spin_unlock(&adapter->tx_queue_lock);
+	pr_debug("next_to_clean : %d\n", tx_ring->next_to_clean);
+	return cleaned;
+}
+
+/**
+ * pch_gbe_clean_rx - Send received data up the network stack; legacy
+ * @adapter:     Board private structure
+ * @rx_ring:     Rx descriptor ring
+ * @work_done:   Completed count
+ * @work_to_do:  Request count
+ * Returns
+ *	true:  Cleaned the descriptor
+ *	false: Not cleaned the descriptor
+ */
+static bool
+pch_gbe_clean_rx(struct pch_gbe_adapter *adapter,
+		 struct pch_gbe_rx_ring *rx_ring,
+		 int *work_done, int work_to_do)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev *pdev = adapter->pdev;
+	struct pch_gbe_buffer *buffer_info;
+	struct pch_gbe_rx_desc *rx_desc;
+	u32 length;
+	unsigned char tmp_packet[ETH_HLEN];
+	unsigned int i;
+	unsigned int cleaned_count = 0;
+	bool cleaned = false;
+	struct sk_buff *skb;
+	u8 dma_status;
+	u16 gbec_status;
+	u32 tcp_ip_status;
+	u8 skb_copy_flag = 0;
+	u8 skb_padding_flag = 0;
+
+	i = rx_ring->next_to_clean;
+
+	while (*work_done < work_to_do) {
+		/* Check Rx descriptor status */
+		rx_desc = PCH_GBE_RX_DESC(*rx_ring, i);
+		if (rx_desc->gbec_status == DSC_INIT16)
+			break;
+		cleaned = true;
+		cleaned_count++;
+
+		dma_status = rx_desc->dma_status;
+		gbec_status = rx_desc->gbec_status;
+		tcp_ip_status = rx_desc->tcp_ip_status;
+		rx_desc->gbec_status = DSC_INIT16;
+		buffer_info = &rx_ring->buffer_info[i];
+		skb = buffer_info->skb;
+
+		/* unmap dma */
+		dma_unmap_single(&pdev->dev, buffer_info->dma,
+				   buffer_info->length, DMA_FROM_DEVICE);
+		buffer_info->mapped = false;
+		/* Prefetch the packet */
+		prefetch(skb->data);
+
+		pr_debug("RxDecNo = 0x%04x  Status[DMA:0x%02x GBE:0x%04x "
+			 "TCP:0x%08x]  BufInf = 0x%p\n",
+			 i, dma_status, gbec_status, tcp_ip_status,
+			 buffer_info);
+		/* Error check */
+		if (unlikely(gbec_status & PCH_GBE_RXD_GMAC_STAT_NOTOCTAL)) {
+			adapter->stats.rx_frame_errors++;
+			pr_err("Receive Not Octal Error\n");
+		} else if (unlikely(gbec_status &
+				PCH_GBE_RXD_GMAC_STAT_NBLERR)) {
+			adapter->stats.rx_frame_errors++;
+			pr_err("Receive Nibble Error\n");
+		} else if (unlikely(gbec_status &
+				PCH_GBE_RXD_GMAC_STAT_CRCERR)) {
+			adapter->stats.rx_crc_errors++;
+			pr_err("Receive CRC Error\n");
+		} else {
+			/* get receive length */
+			/* length convert[-3], padding[-2] */
+			length = (rx_desc->rx_words_eob) - 3 - 2;
+
+			/* Decide the data conversion method */
+			if (!adapter->rx_csum) {
+				/* [Header:14][payload] */
+				skb_padding_flag = 0;
+				skb_copy_flag = 1;
+			} else {
+				/* [Header:14][padding:2][payload] */
+				skb_padding_flag = 1;
+				if (length < copybreak)
+					skb_copy_flag = 1;
+				else
+					skb_copy_flag = 0;
+			}
+
+			/* Data conversion */
+			if (skb_copy_flag) {	/* recycle  skb */
+				struct sk_buff *new_skb;
+				new_skb =
+				    netdev_alloc_skb(netdev,
+						     length + NET_IP_ALIGN);
+				if (new_skb) {
+					if (!skb_padding_flag) {
+						skb_reserve(new_skb,
+								NET_IP_ALIGN);
+					}
+					memcpy(new_skb->data, skb->data,
+						length);
+					/* save the skb
+					 * in buffer_info as good */
+					skb = new_skb;
+				} else if (!skb_padding_flag) {
+					/* dorrop error */
+					pr_err("New skb allocation Error\n");
+					goto dorrop;
+				}
+			} else {
+				buffer_info->skb = NULL;
+			}
+			if (skb_padding_flag) {
+				memcpy(&tmp_packet[0], &skb->data[0], ETH_HLEN);
+				memcpy(&skb->data[NET_IP_ALIGN], &tmp_packet[0],
+					ETH_HLEN);
+				skb_reserve(skb, NET_IP_ALIGN);
+
+			}
+
+			/* update status of driver */
+			adapter->stats.rx_bytes += length;
+			adapter->stats.rx_packets++;
+			if ((gbec_status & PCH_GBE_RXD_GMAC_STAT_MARMLT))
+				adapter->stats.multicast++;
+			/* Write meta date of skb */
+			skb_put(skb, length);
+			skb->protocol = eth_type_trans(skb, netdev);
+			if ((tcp_ip_status & PCH_GBE_RXD_ACC_STAT_TCPIPOK) ==
+			    PCH_GBE_RXD_ACC_STAT_TCPIPOK) {
+				skb->ip_summed = CHECKSUM_UNNECESSARY;
+			} else {
+				skb->ip_summed = CHECKSUM_NONE;
+			}
+			napi_gro_receive(&adapter->napi, skb);
+			(*work_done)++;
+			pr_debug("Receive skb->ip_summed: %d length: %d\n",
+				 skb->ip_summed, length);
+		}
+dorrop:
+		/* return some buffers to hardware, one at a time is too slow */
+		if (unlikely(cleaned_count >= PCH_GBE_RX_BUFFER_WRITE)) {
+			pch_gbe_alloc_rx_buffers(adapter, rx_ring,
+						 cleaned_count);
+			cleaned_count = 0;
+		}
+		if (++i == rx_ring->count)
+			i = 0;
+	}
+	rx_ring->next_to_clean = i;
+	if (cleaned_count)
+		pch_gbe_alloc_rx_buffers(adapter, rx_ring, cleaned_count);
+	return cleaned;
+}
+
+/**
+ * pch_gbe_setup_tx_resources - Allocate Tx resources (Descriptors)
+ * @adapter:  Board private structure
+ * @tx_ring:  Tx descriptor ring (for a specific queue) to setup
+ * Returns
+ *	0:		Successfully
+ *	Negative value:	Failed
+ */
+int pch_gbe_setup_tx_resources(struct pch_gbe_adapter *adapter,
+				struct pch_gbe_tx_ring *tx_ring)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	struct pch_gbe_tx_desc *tx_desc;
+	int size;
+	int desNo;
+
+	size = (int)sizeof(struct pch_gbe_buffer) * tx_ring->count;
+	tx_ring->buffer_info = vmalloc(size);
+	if (!tx_ring->buffer_info) {
+		pr_err("Unable to allocate memory for the buffer infomation\n");
+		return -ENOMEM;
+	}
+	memset(tx_ring->buffer_info, 0, size);
+
+	tx_ring->size = tx_ring->count * (int)sizeof(struct pch_gbe_tx_desc);
+
+	tx_ring->desc = dma_alloc_coherent(&pdev->dev, tx_ring->size,
+					   &tx_ring->dma, GFP_KERNEL);
+	if (!tx_ring->desc) {
+		vfree(tx_ring->buffer_info);
+		pr_err("Unable to allocate memory for the transmit descriptor ring\n");
+		return -ENOMEM;
+	}
+	memset(tx_ring->desc, 0, tx_ring->size);
+
+	tx_ring->next_to_use = 0;
+	tx_ring->next_to_clean = 0;
+	spin_lock_init(&tx_ring->tx_lock);
+
+	for (desNo = 0; desNo < tx_ring->count; desNo++) {
+		tx_desc = PCH_GBE_TX_DESC(*tx_ring, desNo);
+		tx_desc->gbec_status = DSC_INIT16;
+	}
+	pr_debug("tx_ring->desc = 0x%p  tx_ring->dma = 0x%08llx\n"
+		 "next_to_clean = 0x%08x  next_to_use = 0x%08x\n",
+		 tx_ring->desc, (unsigned long long)tx_ring->dma,
+		 tx_ring->next_to_clean, tx_ring->next_to_use);
+	return 0;
+}
+
+/**
+ * pch_gbe_setup_rx_resources - Allocate Rx resources (Descriptors)
+ * @adapter:  Board private structure
+ * @rx_ring:  Rx descriptor ring (for a specific queue) to setup
+ * Returns
+ *	0:		Successfully
+ *	Negative value:	Failed
+ */
+int pch_gbe_setup_rx_resources(struct pch_gbe_adapter *adapter,
+				struct pch_gbe_rx_ring *rx_ring)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	struct pch_gbe_rx_desc *rx_desc;
+	int size;
+	int desNo;
+
+	size = (int)sizeof(struct pch_gbe_buffer) * rx_ring->count;
+	rx_ring->buffer_info = vmalloc(size);
+	if (!rx_ring->buffer_info) {
+		pr_err("Unable to allocate memory for the receive descriptor ring\n");
+		return -ENOMEM;
+	}
+	memset(rx_ring->buffer_info, 0, size);
+	rx_ring->size = rx_ring->count * (int)sizeof(struct pch_gbe_rx_desc);
+	rx_ring->desc =	dma_alloc_coherent(&pdev->dev, rx_ring->size,
+					   &rx_ring->dma, GFP_KERNEL);
+
+	if (!rx_ring->desc) {
+		pr_err("Unable to allocate memory for the receive descriptor ring\n");
+		vfree(rx_ring->buffer_info);
+		return -ENOMEM;
+	}
+	memset(rx_ring->desc, 0, rx_ring->size);
+	rx_ring->next_to_clean = 0;
+	rx_ring->next_to_use = 0;
+	for (desNo = 0; desNo < rx_ring->count; desNo++) {
+		rx_desc = PCH_GBE_RX_DESC(*rx_ring, desNo);
+		rx_desc->gbec_status = DSC_INIT16;
+	}
+	pr_debug("rx_ring->desc = 0x%p  rx_ring->dma = 0x%08llx "
+		 "next_to_clean = 0x%08x  next_to_use = 0x%08x\n",
+		 rx_ring->desc, (unsigned long long)rx_ring->dma,
+		 rx_ring->next_to_clean, rx_ring->next_to_use);
+	return 0;
+}
+
+/**
+ * pch_gbe_free_tx_resources - Free Tx Resources
+ * @adapter:  Board private structure
+ * @tx_ring:  Tx descriptor ring for a specific queue
+ */
+void pch_gbe_free_tx_resources(struct pch_gbe_adapter *adapter,
+				struct pch_gbe_tx_ring *tx_ring)
+{
+	struct pci_dev *pdev = adapter->pdev;
+
+	pch_gbe_clean_tx_ring(adapter, tx_ring);
+	vfree(tx_ring->buffer_info);
+	tx_ring->buffer_info = NULL;
+	pci_free_consistent(pdev, tx_ring->size, tx_ring->desc, tx_ring->dma);
+	tx_ring->desc = NULL;
+}
+
+/**
+ * pch_gbe_free_rx_resources - Free Rx Resources
+ * @adapter:  Board private structure
+ * @rx_ring:  Ring to clean the resources from
+ */
+void pch_gbe_free_rx_resources(struct pch_gbe_adapter *adapter,
+				struct pch_gbe_rx_ring *rx_ring)
+{
+	struct pci_dev *pdev = adapter->pdev;
+
+	pch_gbe_clean_rx_ring(adapter, rx_ring);
+	vfree(rx_ring->buffer_info);
+	rx_ring->buffer_info = NULL;
+	pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
+	rx_ring->desc = NULL;
+}
+
+/**
+ * pch_gbe_request_irq - Allocate an interrupt line
+ * @adapter:  Board private structure
+ * Returns
+ *	0:		Successfully
+ *	Negative value:	Failed
+ */
+static int pch_gbe_request_irq(struct pch_gbe_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	int err;
+	int flags;
+
+	flags = IRQF_SHARED;
+	adapter->have_msi = false;
+	err = pci_enable_msi(adapter->pdev);
+	pr_debug("call pci_enable_msi\n");
+	if (err) {
+		pr_debug("call pci_enable_msi - Error: %d\n", err);
+	} else {
+		flags = 0;
+		adapter->have_msi = true;
+	}
+	err = request_irq(adapter->pdev->irq, &pch_gbe_intr,
+			  flags, netdev->name, netdev);
+	if (err)
+		pr_err("Unable to allocate interrupt Error: %d\n", err);
+	pr_debug("adapter->have_msi : %d  flags : 0x%04x  return : 0x%04x\n",
+		 adapter->have_msi, flags, err);
+	return err;
+}
+
+
+static void pch_gbe_set_multi(struct net_device *netdev);
+/**
+ * pch_gbe_up - Up GbE network device
+ * @adapter:  Board private structure
+ * Returns
+ *	0:		Successfully
+ *	Negative value:	Failed
+ */
+int pch_gbe_up(struct pch_gbe_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring;
+	struct pch_gbe_rx_ring *rx_ring = adapter->rx_ring;
+	int err;
+
+	/* hardware has been reset, we need to reload some things */
+	pch_gbe_set_multi(netdev);
+
+	pch_gbe_setup_tctl(adapter);
+	pch_gbe_configure_tx(adapter);
+	pch_gbe_setup_rctl(adapter);
+	pch_gbe_configure_rx(adapter);
+
+	err = pch_gbe_request_irq(adapter);
+	if (err) {
+		pr_err("Error: can't bring device up\n");
+		return err;
+	}
+	pch_gbe_alloc_tx_buffers(adapter, tx_ring);
+	pch_gbe_alloc_rx_buffers(adapter, rx_ring, rx_ring->count);
+	adapter->tx_queue_len = netdev->tx_queue_len;
+
+	mod_timer(&adapter->watchdog_timer, jiffies);
+
+	napi_enable(&adapter->napi);
+	pch_gbe_irq_enable(adapter);
+	netif_start_queue(adapter->netdev);
+
+	return 0;
+}
+
+/**
+ * pch_gbe_down - Down GbE network device
+ * @adapter:  Board private structure
+ */
+void pch_gbe_down(struct pch_gbe_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+
+	/* signal that we're down so the interrupt handler does not
+	 * reschedule our watchdog timer */
+	napi_disable(&adapter->napi);
+	atomic_set(&adapter->irq_sem, 0);
+
+	pch_gbe_irq_disable(adapter);
+	pch_gbe_free_irq(adapter);
+
+	del_timer_sync(&adapter->watchdog_timer);
+
+	netdev->tx_queue_len = adapter->tx_queue_len;
+	netif_carrier_off(netdev);
+	netif_stop_queue(netdev);
+
+	pch_gbe_reset(adapter);
+	pch_gbe_clean_tx_ring(adapter, adapter->tx_ring);
+	pch_gbe_clean_rx_ring(adapter, adapter->rx_ring);
+}
+
+/**
+ * pch_gbe_sw_init - Initialize general software structures (struct pch_gbe_adapter)
+ * @adapter:  Board private structure to initialize
+ * Returns
+ *	0:		Successfully
+ *	Negative value:	Failed
+ */
+static int pch_gbe_sw_init(struct pch_gbe_adapter *adapter)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	struct net_device *netdev = adapter->netdev;
+
+	adapter->rx_buffer_len = PCH_GBE_FRAME_SIZE_2048;
+	hw->mac.max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
+	hw->mac.min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
+
+	/* Initialize the hardware-specific values */
+	if (pch_gbe_hal_setup_init_funcs(hw)) {
+		pr_err("Hardware Initialization Failure\n");
+		return -EIO;
+	}
+	if (pch_gbe_alloc_queues(adapter)) {
+		pr_err("Unable to allocate memory for queues\n");
+		return -ENOMEM;
+	}
+	spin_lock_init(&adapter->hw.miim_lock);
+	spin_lock_init(&adapter->tx_queue_lock);
+	spin_lock_init(&adapter->stats_lock);
+	spin_lock_init(&adapter->ethtool_lock);
+	atomic_set(&adapter->irq_sem, 0);
+	pch_gbe_irq_disable(adapter);
+
+	pch_gbe_init_stats(adapter);
+
+	pr_debug("rx_buffer_len : %d  mac.min_frame_size : %d  mac.max_frame_size : %d\n",
+		 (u32) adapter->rx_buffer_len,
+		 hw->mac.min_frame_size, hw->mac.max_frame_size);
+	return 0;
+}
+
+/**
+ * pch_gbe_open - Called when a network interface is made active
+ * @netdev:	Network interface device structure
+ * Returns
+ *	0:		Successfully
+ *	Negative value:	Failed
+ */
+static int pch_gbe_open(struct net_device *netdev)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+	int err;
+
+	/* allocate transmit descriptors */
+	err = pch_gbe_setup_tx_resources(adapter, adapter->tx_ring);
+	if (err)
+		goto err_setup_tx;
+	/* allocate receive descriptors */
+	err = pch_gbe_setup_rx_resources(adapter, adapter->rx_ring);
+	if (err)
+		goto err_setup_rx;
+	pch_gbe_hal_power_up_phy(hw);
+	err = pch_gbe_up(adapter);
+	if (err)
+		goto err_up;
+	pr_debug("Success End\n");
+	return 0;
+
+err_up:
+	if (!adapter->wake_up_evt)
+		pch_gbe_hal_power_down_phy(hw);
+	pch_gbe_free_rx_resources(adapter, adapter->rx_ring);
+err_setup_rx:
+	pch_gbe_free_tx_resources(adapter, adapter->tx_ring);
+err_setup_tx:
+	pch_gbe_reset(adapter);
+	pr_err("Error End\n");
+	return err;
+}
+
+/**
+ * pch_gbe_stop - Disables a network interface
+ * @netdev:  Network interface device structure
+ * Returns
+ *	0: Successfully
+ */
+static int pch_gbe_stop(struct net_device *netdev)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+
+	pch_gbe_down(adapter);
+	if (!adapter->wake_up_evt)
+		pch_gbe_hal_power_down_phy(hw);
+	pch_gbe_free_tx_resources(adapter, adapter->tx_ring);
+	pch_gbe_free_rx_resources(adapter, adapter->rx_ring);
+	return 0;
+}
+
+/**
+ * pch_gbe_xmit_frame - Packet transmitting start
+ * @skb:     Socket buffer structure
+ * @netdev:  Network interface device structure
+ * Returns
+ *	- NETDEV_TX_OK:   Normal end
+ *	- NETDEV_TX_BUSY: Error end
+ */
+static int pch_gbe_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring;
+	unsigned long flags;
+
+	if (unlikely(skb->len > (adapter->hw.mac.max_frame_size - 4))) {
+		dev_kfree_skb_any(skb);
+		pr_err("Transfer length Error: skb len: %d > max: %d\n",
+		       skb->len, adapter->hw.mac.max_frame_size);
+		adapter->stats.tx_length_errors++;
+		return NETDEV_TX_OK;
+	}
+	if (!spin_trylock_irqsave(&tx_ring->tx_lock, flags)) {
+		/* Collision - tell upper layer to requeue */
+		return NETDEV_TX_LOCKED;
+	}
+	if (unlikely(!PCH_GBE_DESC_UNUSED(tx_ring))) {
+		netif_stop_queue(netdev);
+		spin_unlock_irqrestore(&tx_ring->tx_lock, flags);
+		pr_debug("Return : BUSY  next_to use : 0x%08x  next_to clean : 0x%08x\n",
+			 tx_ring->next_to_use, tx_ring->next_to_clean);
+		return NETDEV_TX_BUSY;
+	}
+	spin_unlock_irqrestore(&tx_ring->tx_lock, flags);
+
+	/* CRC,ITAG no support */
+	pch_gbe_tx_queue(adapter, tx_ring, skb);
+	return NETDEV_TX_OK;
+}
+
+/**
+ * pch_gbe_get_stats - Get System Network Statistics
+ * @netdev:  Network interface device structure
+ * Returns:  The current stats
+ */
+static struct net_device_stats *pch_gbe_get_stats(struct net_device *netdev)
+{
+	/* only return the current stats */
+	return &netdev->stats;
+}
+
+/**
+ * pch_gbe_set_multi - Multicast and Promiscuous mode set
+ * @netdev:   Network interface device structure
+ */
+static void pch_gbe_set_multi(struct net_device *netdev)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+	struct netdev_hw_addr *ha;
+	u8 *mta_list;
+	u32 rctl;
+	int i;
+	int mc_count;
+
+	pr_debug("netdev->flags : 0x%08x\n", netdev->flags);
+
+	/* Check for Promiscuous and All Multicast modes */
+	rctl = ioread32(&hw->reg->RX_MODE);
+	mc_count = netdev_mc_count(netdev);
+	if ((netdev->flags & IFF_PROMISC)) {
+		rctl &= ~PCH_GBE_ADD_FIL_EN;
+		rctl &= ~PCH_GBE_MLT_FIL_EN;
+	} else if ((netdev->flags & IFF_ALLMULTI)) {
+		/* all the multicasting receive permissions */
+		rctl |= PCH_GBE_ADD_FIL_EN;
+		rctl &= ~PCH_GBE_MLT_FIL_EN;
+	} else {
+		if (mc_count >= PCH_GBE_MAR_ENTRIES) {
+			/* all the multicasting receive permissions */
+			rctl |= PCH_GBE_ADD_FIL_EN;
+			rctl &= ~PCH_GBE_MLT_FIL_EN;
+		} else {
+			rctl |= (PCH_GBE_ADD_FIL_EN | PCH_GBE_MLT_FIL_EN);
+		}
+	}
+	iowrite32(rctl, &hw->reg->RX_MODE);
+
+	if (mc_count >= PCH_GBE_MAR_ENTRIES)
+		return;
+	mta_list = kmalloc(mc_count * ETH_ALEN, GFP_ATOMIC);
+	if (!mta_list)
+		return;
+
+	/* The shared function expects a packed array of only addresses. */
+	i = 0;
+	netdev_for_each_mc_addr(ha, netdev) {
+		if (i == mc_count)
+			break;
+		memcpy(mta_list + (i++ * ETH_ALEN), &ha->addr, ETH_ALEN);
+	}
+	pch_gbe_mac_mc_addr_list_update(hw, mta_list, i, 1,
+					PCH_GBE_MAR_ENTRIES);
+	kfree(mta_list);
+
+	pr_debug("RX_MODE reg(check bit31,30 ADD,MLT) : 0x%08x  netdev->mc_count : 0x%08x\n",
+		 ioread32(&hw->reg->RX_MODE), mc_count);
+}
+
+/**
+ * pch_gbe_set_mac - Change the Ethernet Address of the NIC
+ * @netdev: Network interface device structure
+ * @addr:   Pointer to an address structure
+ * Returns
+ *	0:		Successfully
+ *	-EADDRNOTAVAIL:	Failed
+ */
+static int pch_gbe_set_mac(struct net_device *netdev, void *addr)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct sockaddr *skaddr = addr;
+	int ret_val;
+
+	if (!is_valid_ether_addr(skaddr->sa_data)) {
+		ret_val = -EADDRNOTAVAIL;
+	} else {
+		memcpy(netdev->dev_addr, skaddr->sa_data, netdev->addr_len);
+		memcpy(adapter->hw.mac.addr, skaddr->sa_data, netdev->addr_len);
+		pch_gbe_mac_mar_set(&adapter->hw, adapter->hw.mac.addr, 0);
+		ret_val = 0;
+	}
+	pr_debug("ret_val : 0x%08x\n", ret_val);
+	pr_debug("dev_addr : %pM\n", netdev->dev_addr);
+	pr_debug("mac_addr : %pM\n", adapter->hw.mac.addr);
+	pr_debug("MAC_ADR1AB reg : 0x%08x 0x%08x\n",
+		 ioread32(&adapter->hw.reg->mac_adr[0].high),
+		 ioread32(&adapter->hw.reg->mac_adr[0].low));
+	return ret_val;
+}
+
+/**
+ * pch_gbe_change_mtu - Change the Maximum Transfer Unit
+ * @netdev:   Network interface device structure
+ * @new_mtu:  New value for maximum frame size
+ * Returns
+ *	0:		Successfully
+ *	-EINVAL:	Failed
+ */
+static int pch_gbe_change_mtu(struct net_device *netdev, int new_mtu)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	int max_frame;
+
+	max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
+	if ((max_frame < ETH_ZLEN + ETH_FCS_LEN) ||
+		(max_frame > PCH_GBE_MAX_JUMBO_FRAME_SIZE)) {
+		pr_err("Invalid MTU setting\n");
+		return -EINVAL;
+	}
+	if (max_frame <= PCH_GBE_FRAME_SIZE_2048)
+		adapter->rx_buffer_len = PCH_GBE_FRAME_SIZE_2048;
+	else if (max_frame <= PCH_GBE_FRAME_SIZE_4096)
+		adapter->rx_buffer_len = PCH_GBE_FRAME_SIZE_4096;
+	else if (max_frame <= PCH_GBE_FRAME_SIZE_8192)
+		adapter->rx_buffer_len = PCH_GBE_FRAME_SIZE_8192;
+	else
+		adapter->rx_buffer_len = PCH_GBE_MAX_JUMBO_FRAME_SIZE;
+	netdev->mtu = new_mtu;
+	adapter->hw.mac.max_frame_size = max_frame;
+
+	if (netif_running(netdev))
+		pch_gbe_reinit_locked(adapter);
+	else
+		pch_gbe_reset(adapter);
+
+	pr_debug("max_frame : %d  rx_buffer_len : %d  mtu : %d  max_frame_size : %d\n",
+		 max_frame, (u32) adapter->rx_buffer_len, netdev->mtu,
+		 adapter->hw.mac.max_frame_size);
+	return 0;
+}
+
+/**
+ * pch_gbe_ioctl - Controls register through a MII interface
+ * @netdev:   Network interface device structure
+ * @ifr:      Pointer to ifr structure
+ * @cmd:      Control command
+ * Returns
+ *	0:	Successfully
+ *	Negative value:	Failed
+ */
+static int pch_gbe_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	pr_debug("cmd : 0x%04x\n", cmd);
+
+	return generic_mii_ioctl(&adapter->mii, if_mii(ifr), cmd, NULL);
+}
+
+/**
+ * pch_gbe_tx_timeout - Respond to a Tx Hang
+ * @netdev:   Network interface device structure
+ */
+static void pch_gbe_tx_timeout(struct net_device *netdev)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	/* Do the reset outside of interrupt context */
+	adapter->stats.tx_timeout_count++;
+	schedule_work(&adapter->reset_task);
+}
+
+/**
+ * pch_gbe_napi_poll - NAPI receive and transfer polling callback
+ * @napi:    Pointer of polling device struct
+ * @budget:  The maximum number of a packet
+ * Returns
+ *	false:  Exit the polling mode
+ *	true:   Continue the polling mode
+ */
+static int pch_gbe_napi_poll(struct napi_struct *napi, int budget)
+{
+	struct pch_gbe_adapter *adapter =
+	    container_of(napi, struct pch_gbe_adapter, napi);
+	struct net_device *netdev = adapter->netdev;
+	int work_done = 0;
+	bool poll_end_flag = false;
+	bool cleaned = false;
+
+	pr_debug("budget : %d\n", budget);
+
+	/* Keep link state information with original netdev */
+	if (!netif_carrier_ok(netdev)) {
+		poll_end_flag = true;
+	} else {
+		cleaned = pch_gbe_clean_tx(adapter, adapter->tx_ring);
+		pch_gbe_clean_rx(adapter, adapter->rx_ring, &work_done, budget);
+
+		if (cleaned)
+			work_done = budget;
+		/* If no Tx and not enough Rx work done,
+		 * exit the polling mode
+		 */
+		if ((work_done < budget) || !netif_running(netdev))
+			poll_end_flag = true;
+	}
+
+	if (poll_end_flag) {
+		napi_complete(napi);
+		pch_gbe_irq_enable(adapter);
+	}
+
+	pr_debug("poll_end_flag : %d  work_done : %d  budget : %d\n",
+		 poll_end_flag, work_done, budget);
+
+	return work_done;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/**
+ * pch_gbe_netpoll - Used by things like netconsole to send skbs
+ * @netdev:  Network interface device structure
+ */
+static void pch_gbe_netpoll(struct net_device *netdev)
+{
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	disable_irq(adapter->pdev->irq);
+	pch_gbe_intr(adapter->pdev->irq, netdev);
+	enable_irq(adapter->pdev->irq);
+}
+#endif
+
+static const struct net_device_ops pch_gbe_netdev_ops = {
+	.ndo_open = pch_gbe_open,
+	.ndo_stop = pch_gbe_stop,
+	.ndo_start_xmit = pch_gbe_xmit_frame,
+	.ndo_get_stats = pch_gbe_get_stats,
+	.ndo_set_mac_address = pch_gbe_set_mac,
+	.ndo_tx_timeout = pch_gbe_tx_timeout,
+	.ndo_change_mtu = pch_gbe_change_mtu,
+	.ndo_do_ioctl = pch_gbe_ioctl,
+	.ndo_set_multicast_list = &pch_gbe_set_multi,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller = pch_gbe_netpoll,
+#endif
+};
+
+static pci_ers_result_t pch_gbe_io_error_detected(struct pci_dev *pdev,
+						pci_channel_state_t state)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	netif_device_detach(netdev);
+	if (netif_running(netdev))
+		pch_gbe_down(adapter);
+	pci_disable_device(pdev);
+	/* Request a slot slot reset. */
+	return PCI_ERS_RESULT_NEED_RESET;
+}
+
+static pci_ers_result_t pch_gbe_io_slot_reset(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+
+	if (pci_enable_device(pdev)) {
+		pr_err("Cannot re-enable PCI device after reset\n");
+		return PCI_ERS_RESULT_DISCONNECT;
+	}
+	pci_set_master(pdev);
+	pci_enable_wake(pdev, PCI_D0, 0);
+	pch_gbe_hal_power_up_phy(hw);
+	pch_gbe_reset(adapter);
+	/* Clear wake up status */
+	pch_gbe_mac_set_wol_event(hw, 0);
+
+	return PCI_ERS_RESULT_RECOVERED;
+}
+
+static void pch_gbe_io_resume(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	if (netif_running(netdev)) {
+		if (pch_gbe_up(adapter)) {
+			pr_debug("can't bring device back up after reset\n");
+			return;
+		}
+	}
+	netif_device_attach(netdev);
+}
+
+static int __pch_gbe_suspend(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+	u32 wufc = adapter->wake_up_evt;
+	int retval = 0;
+
+	netif_device_detach(netdev);
+	if (netif_running(netdev))
+		pch_gbe_down(adapter);
+	if (wufc) {
+		pch_gbe_set_multi(netdev);
+		pch_gbe_setup_rctl(adapter);
+		pch_gbe_configure_rx(adapter);
+		pch_gbe_set_rgmii_ctrl(adapter, hw->mac.link_speed,
+					hw->mac.link_duplex);
+		pch_gbe_set_mode(adapter, hw->mac.link_speed,
+					hw->mac.link_duplex);
+		pch_gbe_mac_set_wol_event(hw, wufc);
+		pci_disable_device(pdev);
+	} else {
+		pch_gbe_hal_power_down_phy(hw);
+		pch_gbe_mac_set_wol_event(hw, wufc);
+		pci_disable_device(pdev);
+	}
+	return retval;
+}
+
+#ifdef CONFIG_PM
+static int pch_gbe_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+
+	return __pch_gbe_suspend(pdev);
+}
+
+static int pch_gbe_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+	struct pch_gbe_hw *hw = &adapter->hw;
+	u32 err;
+
+	err = pci_enable_device(pdev);
+	if (err) {
+		pr_err("Cannot enable PCI device from suspend\n");
+		return err;
+	}
+	pci_set_master(pdev);
+	pch_gbe_hal_power_up_phy(hw);
+	pch_gbe_reset(adapter);
+	/* Clear wake on lan control and status */
+	pch_gbe_mac_set_wol_event(hw, 0);
+
+	if (netif_running(netdev))
+		pch_gbe_up(adapter);
+	netif_device_attach(netdev);
+
+	return 0;
+}
+#endif /* CONFIG_PM */
+
+static void pch_gbe_shutdown(struct pci_dev *pdev)
+{
+	__pch_gbe_suspend(pdev);
+	if (system_state == SYSTEM_POWER_OFF) {
+		pci_wake_from_d3(pdev, true);
+		pci_set_power_state(pdev, PCI_D3hot);
+	}
+}
+
+static void pch_gbe_remove(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
+
+	flush_scheduled_work();
+	unregister_netdev(netdev);
+
+	pch_gbe_hal_phy_hw_reset(&adapter->hw);
+
+	kfree(adapter->tx_ring);
+	kfree(adapter->rx_ring);
+
+	iounmap(adapter->hw.reg);
+	pci_release_regions(pdev);
+	free_netdev(netdev);
+	pci_disable_device(pdev);
+}
+
+static int pch_gbe_probe(struct pci_dev *pdev,
+			  const struct pci_device_id *pci_id)
+{
+	struct net_device *netdev;
+	struct pch_gbe_adapter *adapter;
+	int ret;
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
+		|| pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
+		ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+		if (ret) {
+			ret = pci_set_consistent_dma_mask(pdev,
+							  DMA_BIT_MASK(32));
+			if (ret) {
+				dev_err(&pdev->dev, "ERR: No usable DMA "
+					"configuration, aborting\n");
+				goto err_disable_device;
+			}
+		}
+	}
+
+	ret = pci_request_regions(pdev, KBUILD_MODNAME);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"ERR: Can't reserve PCI I/O and memory resources\n");
+		goto err_disable_device;
+	}
+	pci_set_master(pdev);
+
+	netdev = alloc_etherdev((int)sizeof(struct pch_gbe_adapter));
+	if (!netdev) {
+		ret = -ENOMEM;
+		dev_err(&pdev->dev,
+			"ERR: Can't allocate and set up an Ethernet device\n");
+		goto err_release_pci;
+	}
+	SET_NETDEV_DEV(netdev, &pdev->dev);
+
+	pci_set_drvdata(pdev, netdev);
+	adapter = netdev_priv(netdev);
+	adapter->netdev = netdev;
+	adapter->pdev = pdev;
+	adapter->hw.back = adapter;
+	adapter->hw.reg = pci_iomap(pdev, PCH_GBE_PCI_BAR, 0);
+	if (!adapter->hw.reg) {
+		ret = -EIO;
+		dev_err(&pdev->dev, "Can't ioremap\n");
+		goto err_free_netdev;
+	}
+
+	netdev->netdev_ops = &pch_gbe_netdev_ops;
+	netdev->watchdog_timeo = PCH_GBE_WATCHDOG_PERIOD;
+	netif_napi_add(netdev, &adapter->napi,
+		       pch_gbe_napi_poll, PCH_GBE_RX_WEIGHT);
+	netdev->features = NETIF_F_HW_CSUM | NETIF_F_GRO;
+	pch_gbe_set_ethtool_ops(netdev);
+
+	pch_gbe_mac_reset_hw(&adapter->hw);
+
+	/* setup the private structure */
+	ret = pch_gbe_sw_init(adapter);
+	if (ret)
+		goto err_iounmap;
+
+	/* Initialize PHY */
+	ret = pch_gbe_init_phy(adapter);
+	if (ret) {
+		dev_err(&pdev->dev, "PHY initialize error\n");
+		goto err_free_adapter;
+	}
+	pch_gbe_hal_get_bus_info(&adapter->hw);
+
+	/* Read the MAC address. and store to the private data */
+	ret = pch_gbe_hal_read_mac_addr(&adapter->hw);
+	if (ret) {
+		dev_err(&pdev->dev, "MAC address Read Error\n");
+		goto err_free_adapter;
+	}
+
+	memcpy(netdev->dev_addr, adapter->hw.mac.addr, netdev->addr_len);
+	if (!is_valid_ether_addr(netdev->dev_addr)) {
+		dev_err(&pdev->dev, "Invalid MAC Address\n");
+		ret = -EIO;
+		goto err_free_adapter;
+	}
+	setup_timer(&adapter->watchdog_timer, pch_gbe_watchdog,
+		    (unsigned long)adapter);
+
+	INIT_WORK(&adapter->reset_task, pch_gbe_reset_task);
+
+	pch_gbe_check_options(adapter);
+
+	if (adapter->tx_csum)
+		netdev->features |= NETIF_F_HW_CSUM;
+	else
+		netdev->features &= ~NETIF_F_HW_CSUM;
+
+	/* initialize the wol settings based on the eeprom settings */
+	adapter->wake_up_evt = PCH_GBE_WL_INIT_SETTING;
+	dev_info(&pdev->dev, "MAC address : %pM\n", netdev->dev_addr);
+
+	/* reset the hardware with the new settings */
+	pch_gbe_reset(adapter);
+
+	ret = register_netdev(netdev);
+	if (ret)
+		goto err_free_adapter;
+	/* tell the stack to leave us alone until pch_gbe_open() is called */
+	netif_carrier_off(netdev);
+	netif_stop_queue(netdev);
+
+	dev_dbg(&pdev->dev, "OKIsemi(R) PCH Network Connection\n");
+
+	device_set_wakeup_enable(&pdev->dev, 1);
+	return 0;
+
+err_free_adapter:
+	pch_gbe_hal_phy_hw_reset(&adapter->hw);
+	kfree(adapter->tx_ring);
+	kfree(adapter->rx_ring);
+err_iounmap:
+	iounmap(adapter->hw.reg);
+err_free_netdev:
+	free_netdev(netdev);
+err_release_pci:
+	pci_release_regions(pdev);
+err_disable_device:
+	pci_disable_device(pdev);
+	return ret;
+}
+
+static const struct pci_device_id pch_gbe_pcidev_id[] = {
+	{.vendor = PCI_VENDOR_ID_INTEL,
+	 .device = PCI_DEVICE_ID_INTEL_IOH1_GBE,
+	 .subvendor = PCI_ANY_ID,
+	 .subdevice = PCI_ANY_ID,
+	 .class = (PCI_CLASS_NETWORK_ETHERNET << 8),
+	 .class_mask = (0xFFFF00)
+	 },
+	/* required last entry */
+	{0}
+};
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops pch_gbe_pm_ops = {
+	.suspend = pch_gbe_suspend,
+	.resume = pch_gbe_resume,
+	.freeze = pch_gbe_suspend,
+	.thaw = pch_gbe_resume,
+	.poweroff = pch_gbe_suspend,
+	.restore = pch_gbe_resume,
+};
+#endif
+
+static struct pci_error_handlers pch_gbe_err_handler = {
+	.error_detected = pch_gbe_io_error_detected,
+	.slot_reset = pch_gbe_io_slot_reset,
+	.resume = pch_gbe_io_resume
+};
+
+static struct pci_driver pch_gbe_pcidev = {
+	.name = KBUILD_MODNAME,
+	.id_table = pch_gbe_pcidev_id,
+	.probe = pch_gbe_probe,
+	.remove = pch_gbe_remove,
+#ifdef CONFIG_PM_OPS
+	.driver.pm = &pch_gbe_pm_ops,
+#endif
+	.shutdown = pch_gbe_shutdown,
+	.err_handler = &pch_gbe_err_handler
+};
+
+
+static int __init pch_gbe_init_module(void)
+{
+	int ret;
+
+	ret = pci_register_driver(&pch_gbe_pcidev);
+	if (copybreak != PCH_GBE_COPYBREAK_DEFAULT) {
+		if (copybreak == 0) {
+			pr_info("copybreak disabled\n");
+		} else {
+			pr_info("copybreak enabled for packets <= %u bytes\n",
+				copybreak);
+		}
+	}
+	return ret;
+}
+
+static void __exit pch_gbe_exit_module(void)
+{
+	pci_unregister_driver(&pch_gbe_pcidev);
+}
+
+module_init(pch_gbe_init_module);
+module_exit(pch_gbe_exit_module);
+
+MODULE_DESCRIPTION("OKI semiconductor PCH Gigabit ethernet Driver");
+MODULE_AUTHOR("OKI semiconductor, <[e-mail]>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_DEVICE_TABLE(pci, pch_gbe_pcidev_id);
+
+module_param(copybreak, uint, 0644);
+MODULE_PARM_DESC(copybreak,
+	"Maximum size of packet that is copied to a new buffer on receive");
+
+/* pch_gbe_main.c */

drivers/net/pch_gbe/pch_gbe_param.c

···
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This code was derived from the Intel e1000e Linux driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include "pch_gbe.h"
+
+#define OPTION_UNSET   -1
+#define OPTION_DISABLED 0
+#define OPTION_ENABLED  1
+
+/**
+ * TxDescriptors - Transmit Descriptor Count
+ * @Valid Range:   PCH_GBE_MIN_TXD - PCH_GBE_MAX_TXD
+ * @Default Value: PCH_GBE_DEFAULT_TXD
+ */
+static int TxDescriptors = OPTION_UNSET;
+module_param(TxDescriptors, int, 0);
+MODULE_PARM_DESC(TxDescriptors, "Number of transmit descriptors");
+
+/**
+ * RxDescriptors -Receive Descriptor Count
+ * @Valid Range:   PCH_GBE_MIN_RXD - PCH_GBE_MAX_RXD
+ * @Default Value: PCH_GBE_DEFAULT_RXD
+ */
+static int RxDescriptors = OPTION_UNSET;
+module_param(RxDescriptors, int, 0);
+MODULE_PARM_DESC(RxDescriptors, "Number of receive descriptors");
+
+/**
+ * Speed - User Specified Speed Override
+ * @Valid Range: 0, 10, 100, 1000
+ *   - 0:    auto-negotiate at all supported speeds
+ *   - 10:   only link at 10 Mbps
+ *   - 100:  only link at 100 Mbps
+ *   - 1000: only link at 1000 Mbps
+ * @Default Value: 0
+ */
+static int Speed = OPTION_UNSET;
+module_param(Speed, int, 0);
+MODULE_PARM_DESC(Speed, "Speed setting");
+
+/**
+ * Duplex - User Specified Duplex Override
+ * @Valid Range: 0-2
+ *   - 0:  auto-negotiate for duplex
+ *   - 1:  only link at half duplex
+ *   - 2:  only link at full duplex
+ * @Default Value: 0
+ */
+static int Duplex = OPTION_UNSET;
+module_param(Duplex, int, 0);
+MODULE_PARM_DESC(Duplex, "Duplex setting");
+
+#define HALF_DUPLEX 1
+#define FULL_DUPLEX 2
+
+/**
+ * AutoNeg - Auto-negotiation Advertisement Override
+ * @Valid Range: 0x01-0x0F, 0x20-0x2F
+ *
+ *       The AutoNeg value is a bit mask describing which speed and duplex
+ *       combinations should be advertised during auto-negotiation.
+ *       The supported speed and duplex modes are listed below
+ *
+ *       Bit           7     6     5      4      3     2     1      0
+ *       Speed (Mbps)  N/A   N/A   1000   N/A    100   100   10     10
+ *       Duplex                    Full          Full  Half  Full   Half
+ *
+ * @Default Value: 0x2F (copper)
+ */
+static int AutoNeg = OPTION_UNSET;
+module_param(AutoNeg, int, 0);
+MODULE_PARM_DESC(AutoNeg, "Advertised auto-negotiation setting");
+
+#define PHY_ADVERTISE_10_HALF      0x0001
+#define PHY_ADVERTISE_10_FULL      0x0002
+#define PHY_ADVERTISE_100_HALF     0x0004
+#define PHY_ADVERTISE_100_FULL     0x0008
+#define PHY_ADVERTISE_1000_HALF    0x0010 /* Not used, just FYI */
+#define PHY_ADVERTISE_1000_FULL    0x0020
+#define PCH_AUTONEG_ADVERTISE_DEFAULT   0x2F
+
+/**
+ * FlowControl - User Specified Flow Control Override
+ * @Valid Range: 0-3
+ *    - 0:  No Flow Control
+ *    - 1:  Rx only, respond to PAUSE frames but do not generate them
+ *    - 2:  Tx only, generate PAUSE frames but ignore them on receive
+ *    - 3:  Full Flow Control Support
+ * @Default Value: Read flow control settings from the EEPROM
+ */
+static int FlowControl = OPTION_UNSET;
+module_param(FlowControl, int, 0);
+MODULE_PARM_DESC(FlowControl, "Flow Control setting");
+
+/*
+ * XsumRX - Receive Checksum Offload Enable/Disable
+ * @Valid Range: 0, 1
+ *    - 0:  disables all checksum offload
+ *    - 1:  enables receive IP/TCP/UDP checksum offload
+ * @Default Value: PCH_GBE_DEFAULT_RX_CSUM
+ */
+static int XsumRX = OPTION_UNSET;
+module_param(XsumRX, int, 0);
+MODULE_PARM_DESC(XsumRX, "Disable or enable Receive Checksum offload");
+
+#define PCH_GBE_DEFAULT_RX_CSUM             true	/* trueorfalse */
+
+/*
+ * XsumTX - Transmit Checksum Offload Enable/Disable
+ * @Valid Range: 0, 1
+ *    - 0:  disables all checksum offload
+ *    - 1:  enables transmit IP/TCP/UDP checksum offload
+ * @Default Value: PCH_GBE_DEFAULT_TX_CSUM
+ */
+static int XsumTX = OPTION_UNSET;
+module_param(XsumTX, int, 0);
+MODULE_PARM_DESC(XsumTX, "Disable or enable Transmit Checksum offload");
+
+#define PCH_GBE_DEFAULT_TX_CSUM             true	/* trueorfalse */
+
+/**
+ * pch_gbe_option - Force the MAC's flow control settings
+ * @hw:	            Pointer to the HW structure
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+struct pch_gbe_option {
+	enum { enable_option, range_option, list_option } type;
+	char *name;
+	char *err;
+	int  def;
+	union {
+		struct { /* range_option info */
+			int min;
+			int max;
+		} r;
+		struct { /* list_option info */
+			int nr;
+			const struct pch_gbe_opt_list { int i; char *str; } *p;
+		} l;
+	} arg;
+};
+
+static const struct pch_gbe_opt_list speed_list[] = {
+	{ 0, "" },
+	{ SPEED_10, "" },
+	{ SPEED_100, "" },
+	{ SPEED_1000, "" }
+};
+
+static const struct pch_gbe_opt_list dplx_list[] = {
+	{ 0, "" },
+	{ HALF_DUPLEX, "" },
+	{ FULL_DUPLEX, "" }
+};
+
+static const struct pch_gbe_opt_list an_list[] =
+	#define AA "AutoNeg advertising "
+	{{ 0x01, AA "10/HD" },
+	 { 0x02, AA "10/FD" },
+	 { 0x03, AA "10/FD, 10/HD" },
+	 { 0x04, AA "100/HD" },
+	 { 0x05, AA "100/HD, 10/HD" },
+	 { 0x06, AA "100/HD, 10/FD" },
+	 { 0x07, AA "100/HD, 10/FD, 10/HD" },
+	 { 0x08, AA "100/FD" },
+	 { 0x09, AA "100/FD, 10/HD" },
+	 { 0x0a, AA "100/FD, 10/FD" },
+	 { 0x0b, AA "100/FD, 10/FD, 10/HD" },
+	 { 0x0c, AA "100/FD, 100/HD" },
+	 { 0x0d, AA "100/FD, 100/HD, 10/HD" },
+	 { 0x0e, AA "100/FD, 100/HD, 10/FD" },
+	 { 0x0f, AA "100/FD, 100/HD, 10/FD, 10/HD" },
+	 { 0x20, AA "1000/FD" },
+	 { 0x21, AA "1000/FD, 10/HD" },
+	 { 0x22, AA "1000/FD, 10/FD" },
+	 { 0x23, AA "1000/FD, 10/FD, 10/HD" },
+	 { 0x24, AA "1000/FD, 100/HD" },
+	 { 0x25, AA "1000/FD, 100/HD, 10/HD" },
+	 { 0x26, AA "1000/FD, 100/HD, 10/FD" },
+	 { 0x27, AA "1000/FD, 100/HD, 10/FD, 10/HD" },
+	 { 0x28, AA "1000/FD, 100/FD" },
+	 { 0x29, AA "1000/FD, 100/FD, 10/HD" },
+	 { 0x2a, AA "1000/FD, 100/FD, 10/FD" },
+	 { 0x2b, AA "1000/FD, 100/FD, 10/FD, 10/HD" },
+	 { 0x2c, AA "1000/FD, 100/FD, 100/HD" },
+	 { 0x2d, AA "1000/FD, 100/FD, 100/HD, 10/HD" },
+	 { 0x2e, AA "1000/FD, 100/FD, 100/HD, 10/FD" },
+	 { 0x2f, AA "1000/FD, 100/FD, 100/HD, 10/FD, 10/HD" }
+};
+
+static const struct pch_gbe_opt_list fc_list[] = {
+	{ PCH_GBE_FC_NONE, "Flow Control Disabled" },
+	{ PCH_GBE_FC_RX_PAUSE, "Flow Control Receive Only" },
+	{ PCH_GBE_FC_TX_PAUSE, "Flow Control Transmit Only" },
+	{ PCH_GBE_FC_FULL, "Flow Control Enabled" }
+};
+
+/**
+ * pch_gbe_validate_option - Validate option
+ * @value:    value
+ * @opt:      option
+ * @adapter:  Board private structure
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+static int pch_gbe_validate_option(int *value,
+				    const struct pch_gbe_option *opt,
+				    struct pch_gbe_adapter *adapter)
+{
+	if (*value == OPTION_UNSET) {
+		*value = opt->def;
+		return 0;
+	}
+
+	switch (opt->type) {
+	case enable_option:
+		switch (*value) {
+		case OPTION_ENABLED:
+			pr_debug("%s Enabled\n", opt->name);
+			return 0;
+		case OPTION_DISABLED:
+			pr_debug("%s Disabled\n", opt->name);
+			return 0;
+		}
+		break;
+	case range_option:
+		if (*value >= opt->arg.r.min && *value <= opt->arg.r.max) {
+			pr_debug("%s set to %i\n", opt->name, *value);
+			return 0;
+		}
+		break;
+	case list_option: {
+		int i;
+		const struct pch_gbe_opt_list *ent;
+
+		for (i = 0; i < opt->arg.l.nr; i++) {
+			ent = &opt->arg.l.p[i];
+			if (*value == ent->i) {
+				if (ent->str[0] != '\0')
+					pr_debug("%s\n", ent->str);
+				return 0;
+			}
+		}
+	}
+		break;
+	default:
+		BUG();
+	}
+
+	pr_debug("Invalid %s value specified (%i) %s\n",
+		 opt->name, *value, opt->err);
+	*value = opt->def;
+	return -1;
+}
+
+/**
+ * pch_gbe_check_copper_options - Range Checking for Link Options, Copper Version
+ * @adapter:  Board private structure
+ */
+static void pch_gbe_check_copper_options(struct pch_gbe_adapter *adapter)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+	int speed, dplx;
+
+	{ /* Speed */
+		static const struct pch_gbe_option opt = {
+			.type = list_option,
+			.name = "Speed",
+			.err  = "parameter ignored",
+			.def  = 0,
+			.arg  = { .l = { .nr = (int)ARRAY_SIZE(speed_list),
+					 .p = speed_list } }
+		};
+		speed = Speed;
+		pch_gbe_validate_option(&speed, &opt, adapter);
+	}
+	{ /* Duplex */
+		static const struct pch_gbe_option opt = {
+			.type = list_option,
+			.name = "Duplex",
+			.err  = "parameter ignored",
+			.def  = 0,
+			.arg  = { .l = { .nr = (int)ARRAY_SIZE(dplx_list),
+					 .p = dplx_list } }
+		};
+		dplx = Duplex;
+		pch_gbe_validate_option(&dplx, &opt, adapter);
+	}
+
+	{ /* Autoneg */
+		static const struct pch_gbe_option opt = {
+			.type = list_option,
+			.name = "AutoNeg",
+			.err  = "parameter ignored",
+			.def  = PCH_AUTONEG_ADVERTISE_DEFAULT,
+			.arg  = { .l = { .nr = (int)ARRAY_SIZE(an_list),
+					 .p = an_list} }
+		};
+		if (speed || dplx) {
+			pr_debug("AutoNeg specified along with Speed or Duplex, AutoNeg parameter ignored\n");
+			hw->phy.autoneg_advertised = opt.def;
+		} else {
+			hw->phy.autoneg_advertised = AutoNeg;
+			pch_gbe_validate_option(
+				(int *)(&hw->phy.autoneg_advertised),
+				&opt, adapter);
+		}
+	}
+
+	switch (speed + dplx) {
+	case 0:
+		hw->mac.autoneg = hw->mac.fc_autoneg = 1;
+		if ((speed || dplx))
+			pr_debug("Speed and duplex autonegotiation enabled\n");
+		hw->mac.link_speed = SPEED_10;
+		hw->mac.link_duplex = DUPLEX_HALF;
+		break;
+	case HALF_DUPLEX:
+		pr_debug("Half Duplex specified without Speed\n");
+		pr_debug("Using Autonegotiation at Half Duplex only\n");
+		hw->mac.autoneg = hw->mac.fc_autoneg = 1;
+		hw->phy.autoneg_advertised = PHY_ADVERTISE_10_HALF |
+						PHY_ADVERTISE_100_HALF;
+		hw->mac.link_speed = SPEED_10;
+		hw->mac.link_duplex = DUPLEX_HALF;
+		break;
+	case FULL_DUPLEX:
+		pr_debug("Full Duplex specified without Speed\n");
+		pr_debug("Using Autonegotiation at Full Duplex only\n");
+		hw->mac.autoneg = hw->mac.fc_autoneg = 1;
+		hw->phy.autoneg_advertised = PHY_ADVERTISE_10_FULL |
+						PHY_ADVERTISE_100_FULL |
+						PHY_ADVERTISE_1000_FULL;
+		hw->mac.link_speed = SPEED_10;
+		hw->mac.link_duplex = DUPLEX_FULL;
+		break;
+	case SPEED_10:
+		pr_debug("10 Mbps Speed specified without Duplex\n");
+		pr_debug("Using Autonegotiation at 10 Mbps only\n");
+		hw->mac.autoneg = hw->mac.fc_autoneg = 1;
+		hw->phy.autoneg_advertised = PHY_ADVERTISE_10_HALF |
+						PHY_ADVERTISE_10_FULL;
+		hw->mac.link_speed = SPEED_10;
+		hw->mac.link_duplex = DUPLEX_HALF;
+		break;
+	case SPEED_10 + HALF_DUPLEX:
+		pr_debug("Forcing to 10 Mbps Half Duplex\n");
+		hw->mac.autoneg = hw->mac.fc_autoneg = 0;
+		hw->phy.autoneg_advertised = 0;
+		hw->mac.link_speed = SPEED_10;
+		hw->mac.link_duplex = DUPLEX_HALF;
+		break;
+	case SPEED_10 + FULL_DUPLEX:
+		pr_debug("Forcing to 10 Mbps Full Duplex\n");
+		hw->mac.autoneg = hw->mac.fc_autoneg = 0;
+		hw->phy.autoneg_advertised = 0;
+		hw->mac.link_speed = SPEED_10;
+		hw->mac.link_duplex = DUPLEX_FULL;
+		break;
+	case SPEED_100:
+		pr_debug("100 Mbps Speed specified without Duplex\n");
+		pr_debug("Using Autonegotiation at 100 Mbps only\n");
+		hw->mac.autoneg = hw->mac.fc_autoneg = 1;
+		hw->phy.autoneg_advertised = PHY_ADVERTISE_100_HALF |
+						PHY_ADVERTISE_100_FULL;
+		hw->mac.link_speed = SPEED_100;
+		hw->mac.link_duplex = DUPLEX_HALF;
+		break;
+	case SPEED_100 + HALF_DUPLEX:
+		pr_debug("Forcing to 100 Mbps Half Duplex\n");
+		hw->mac.autoneg = hw->mac.fc_autoneg = 0;
+		hw->phy.autoneg_advertised = 0;
+		hw->mac.link_speed = SPEED_100;
+		hw->mac.link_duplex = DUPLEX_HALF;
+		break;
+	case SPEED_100 + FULL_DUPLEX:
+		pr_debug("Forcing to 100 Mbps Full Duplex\n");
+		hw->mac.autoneg = hw->mac.fc_autoneg = 0;
+		hw->phy.autoneg_advertised = 0;
+		hw->mac.link_speed = SPEED_100;
+		hw->mac.link_duplex = DUPLEX_FULL;
+		break;
+	case SPEED_1000:
+		pr_debug("1000 Mbps Speed specified without Duplex\n");
+		goto full_duplex_only;
+	case SPEED_1000 + HALF_DUPLEX:
+		pr_debug("Half Duplex is not supported at 1000 Mbps\n");
+		/* fall through */
+	case SPEED_1000 + FULL_DUPLEX:
+full_duplex_only:
+		pr_debug("Using Autonegotiation at 1000 Mbps Full Duplex only\n");
+		hw->mac.autoneg = hw->mac.fc_autoneg = 1;
+		hw->phy.autoneg_advertised = PHY_ADVERTISE_1000_FULL;
+		hw->mac.link_speed = SPEED_1000;
+		hw->mac.link_duplex = DUPLEX_FULL;
+		break;
+	default:
+		BUG();
+	}
+}
+
+/**
+ * pch_gbe_check_options - Range Checking for Command Line Parameters
+ * @adapter:  Board private structure
+ */
+void pch_gbe_check_options(struct pch_gbe_adapter *adapter)
+{
+	struct pch_gbe_hw *hw = &adapter->hw;
+
+	{ /* Transmit Descriptor Count */
+		static const struct pch_gbe_option opt = {
+			.type = range_option,
+			.name = "Transmit Descriptors",
+			.err  = "using default of "
+				__MODULE_STRING(PCH_GBE_DEFAULT_TXD),
+			.def  = PCH_GBE_DEFAULT_TXD,
+			.arg  = { .r = { .min = PCH_GBE_MIN_TXD } },
+			.arg  = { .r = { .max = PCH_GBE_MAX_TXD } }
+		};
+		struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring;
+		tx_ring->count = TxDescriptors;
+		pch_gbe_validate_option(&tx_ring->count, &opt, adapter);
+		tx_ring->count = roundup(tx_ring->count,
+					PCH_GBE_TX_DESC_MULTIPLE);
+	}
+	{ /* Receive Descriptor Count */
+		static const struct pch_gbe_option opt = {
+			.type = range_option,
+			.name = "Receive Descriptors",
+			.err  = "using default of "
+				__MODULE_STRING(PCH_GBE_DEFAULT_RXD),
+			.def  = PCH_GBE_DEFAULT_RXD,
+			.arg  = { .r = { .min = PCH_GBE_MIN_RXD } },
+			.arg  = { .r = { .max = PCH_GBE_MAX_RXD } }
+		};
+		struct pch_gbe_rx_ring *rx_ring = adapter->rx_ring;
+		rx_ring->count = RxDescriptors;
+		pch_gbe_validate_option(&rx_ring->count, &opt, adapter);
+		rx_ring->count = roundup(rx_ring->count,
+				PCH_GBE_RX_DESC_MULTIPLE);
+	}
+	{ /* Checksum Offload Enable/Disable */
+		static const struct pch_gbe_option opt = {
+			.type = enable_option,
+			.name = "Checksum Offload",
+			.err  = "defaulting to Enabled",
+			.def  = PCH_GBE_DEFAULT_RX_CSUM
+		};
+		adapter->rx_csum = XsumRX;
+		pch_gbe_validate_option((int *)(&adapter->rx_csum),
+					&opt, adapter);
+	}
+	{ /* Checksum Offload Enable/Disable */
+		static const struct pch_gbe_option opt = {
+			.type = enable_option,
+			.name = "Checksum Offload",
+			.err  = "defaulting to Enabled",
+			.def  = PCH_GBE_DEFAULT_TX_CSUM
+		};
+		adapter->tx_csum = XsumTX;
+		pch_gbe_validate_option((int *)(&adapter->tx_csum),
+						&opt, adapter);
+	}
+	{ /* Flow Control */
+		static const struct pch_gbe_option opt = {
+			.type = list_option,
+			.name = "Flow Control",
+			.err  = "reading default settings from EEPROM",
+			.def  = PCH_GBE_FC_DEFAULT,
+			.arg  = { .l = { .nr = (int)ARRAY_SIZE(fc_list),
+					 .p = fc_list } }
+		};
+		hw->mac.fc = FlowControl;
+		pch_gbe_validate_option((int *)(&hw->mac.fc),
+						&opt, adapter);
+	}
+
+	pch_gbe_check_copper_options(adapter);
+}

drivers/net/pch_gbe/pch_gbe_phy.c

···
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This code was derived from the Intel e1000e Linux driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include "pch_gbe.h"
+#include "pch_gbe_phy.h"
+
+#define PHY_MAX_REG_ADDRESS   0x1F	/* 5 bit address bus (0-0x1F) */
+
+/* PHY 1000 MII Register/Bit Definitions */
+/* PHY Registers defined by IEEE */
+#define PHY_CONTROL           0x00  /* Control Register */
+#define PHY_STATUS            0x01  /* Status Regiser */
+#define PHY_ID1               0x02  /* Phy Id Register (word 1) */
+#define PHY_ID2               0x03  /* Phy Id Register (word 2) */
+#define PHY_AUTONEG_ADV       0x04  /* Autoneg Advertisement */
+#define PHY_LP_ABILITY        0x05  /* Link Partner Ability (Base Page) */
+#define PHY_AUTONEG_EXP       0x06  /* Autoneg Expansion Register */
+#define PHY_NEXT_PAGE_TX      0x07  /* Next Page TX */
+#define PHY_LP_NEXT_PAGE      0x08  /* Link Partner Next Page */
+#define PHY_1000T_CTRL        0x09  /* 1000Base-T Control Register */
+#define PHY_1000T_STATUS      0x0A  /* 1000Base-T Status Register */
+#define PHY_EXT_STATUS        0x0F  /* Extended Status Register */
+#define PHY_PHYSP_CONTROL     0x10  /* PHY Specific Control Register */
+#define PHY_EXT_PHYSP_CONTROL 0x14  /* Extended PHY Specific Control Register */
+#define PHY_LED_CONTROL       0x18  /* LED Control Register */
+#define PHY_EXT_PHYSP_STATUS  0x1B  /* Extended PHY Specific Status Register */
+
+/* PHY Control Register */
+#define MII_CR_SPEED_SELECT_MSB 0x0040	/* bits 6,13: 10=1000, 01=100, 00=10 */
+#define MII_CR_COLL_TEST_ENABLE 0x0080	/* Collision test enable */
+#define MII_CR_FULL_DUPLEX      0x0100	/* FDX =1, half duplex =0 */
+#define MII_CR_RESTART_AUTO_NEG 0x0200	/* Restart auto negotiation */
+#define MII_CR_ISOLATE          0x0400	/* Isolate PHY from MII */
+#define MII_CR_POWER_DOWN       0x0800	/* Power down */
+#define MII_CR_AUTO_NEG_EN      0x1000	/* Auto Neg Enable */
+#define MII_CR_SPEED_SELECT_LSB 0x2000	/* bits 6,13: 10=1000, 01=100, 00=10 */
+#define MII_CR_LOOPBACK         0x4000	/* 0 = normal, 1 = loopback */
+#define MII_CR_RESET            0x8000	/* 0 = normal, 1 = PHY reset */
+#define MII_CR_SPEED_1000       0x0040
+#define MII_CR_SPEED_100        0x2000
+#define MII_CR_SPEED_10         0x0000
+
+/* PHY Status Register */
+#define MII_SR_EXTENDED_CAPS     0x0001	/* Extended register capabilities */
+#define MII_SR_JABBER_DETECT     0x0002	/* Jabber Detected */
+#define MII_SR_LINK_STATUS       0x0004	/* Link Status 1 = link */
+#define MII_SR_AUTONEG_CAPS      0x0008	/* Auto Neg Capable */
+#define MII_SR_REMOTE_FAULT      0x0010	/* Remote Fault Detect */
+#define MII_SR_AUTONEG_COMPLETE  0x0020	/* Auto Neg Complete */
+#define MII_SR_PREAMBLE_SUPPRESS 0x0040	/* Preamble may be suppressed */
+#define MII_SR_EXTENDED_STATUS   0x0100	/* Ext. status info in Reg 0x0F */
+#define MII_SR_100T2_HD_CAPS     0x0200	/* 100T2 Half Duplex Capable */
+#define MII_SR_100T2_FD_CAPS     0x0400	/* 100T2 Full Duplex Capable */
+#define MII_SR_10T_HD_CAPS       0x0800	/* 10T   Half Duplex Capable */
+#define MII_SR_10T_FD_CAPS       0x1000	/* 10T   Full Duplex Capable */
+#define MII_SR_100X_HD_CAPS      0x2000	/* 100X  Half Duplex Capable */
+#define MII_SR_100X_FD_CAPS      0x4000	/* 100X  Full Duplex Capable */
+#define MII_SR_100T4_CAPS        0x8000	/* 100T4 Capable */
+
+/* Phy Id Register (word 2) */
+#define PHY_REVISION_MASK        0x000F
+
+/* PHY Specific Control Register */
+#define PHYSP_CTRL_ASSERT_CRS_TX  0x0800
+
+
+/* Default value of PHY register */
+#define PHY_CONTROL_DEFAULT         0x1140 /* Control Register */
+#define PHY_AUTONEG_ADV_DEFAULT     0x01e0 /* Autoneg Advertisement */
+#define PHY_NEXT_PAGE_TX_DEFAULT    0x2001 /* Next Page TX */
+#define PHY_1000T_CTRL_DEFAULT      0x0300 /* 1000Base-T Control Register */
+#define PHY_PHYSP_CONTROL_DEFAULT   0x01EE /* PHY Specific Control Register */
+
+/**
+ * pch_gbe_phy_get_id - Retrieve the PHY ID and revision
+ * @hw:	       Pointer to the HW structure
+ * Returns
+ *	0:			Successful.
+ *	Negative value:		Failed.
+ */
+s32 pch_gbe_phy_get_id(struct pch_gbe_hw *hw)
+{
+	struct pch_gbe_phy_info *phy = &hw->phy;
+	s32 ret;
+	u16 phy_id1;
+	u16 phy_id2;
+
+	ret = pch_gbe_phy_read_reg_miic(hw, PHY_ID1, &phy_id1);
+	if (ret)
+		return ret;
+	ret = pch_gbe_phy_read_reg_miic(hw, PHY_ID2, &phy_id2);
+	if (ret)
+		return ret;
+	/*
+	 * PHY_ID1: [bit15-0:ID(21-6)]
+	 * PHY_ID2: [bit15-10:ID(5-0)][bit9-4:Model][bit3-0:revision]
+	 */
+	phy->id = (u32)phy_id1;
+	phy->id = ((phy->id << 6) | ((phy_id2 & 0xFC00) >> 10));
+	phy->revision = (u32) (phy_id2 & 0x000F);
+	pr_debug("phy->id : 0x%08x  phy->revision : 0x%08x\n",
+		 phy->id, phy->revision);
+	return 0;
+}
+
+/**
+ * pch_gbe_phy_read_reg_miic - Read MII control register
+ * @hw:	     Pointer to the HW structure
+ * @offset:  Register offset to be read
+ * @data:    Pointer to the read data
+ * Returns
+ *	0:		Successful.
+ *	-EINVAL:	Invalid argument.
+ */
+s32 pch_gbe_phy_read_reg_miic(struct pch_gbe_hw *hw, u32 offset, u16 *data)
+{
+	struct pch_gbe_phy_info *phy = &hw->phy;
+
+	if (offset > PHY_MAX_REG_ADDRESS) {
+		pr_err("PHY Address %d is out of range\n", offset);
+		return -EINVAL;
+	}
+	*data = pch_gbe_mac_ctrl_miim(hw, phy->addr, PCH_GBE_HAL_MIIM_READ,
+				      offset, (u16)0);
+	return 0;
+}
+
+/**
+ * pch_gbe_phy_write_reg_miic - Write MII control register
+ * @hw:	     Pointer to the HW structure
+ * @offset:  Register offset to be read
+ * @data:    data to write to register at offset
+ * Returns
+ *	0:		Successful.
+ *	-EINVAL:	Invalid argument.
+ */
+s32 pch_gbe_phy_write_reg_miic(struct pch_gbe_hw *hw, u32 offset, u16 data)
+{
+	struct pch_gbe_phy_info *phy = &hw->phy;
+
+	if (offset > PHY_MAX_REG_ADDRESS) {
+		pr_err("PHY Address %d is out of range\n", offset);
+		return -EINVAL;
+	}
+	pch_gbe_mac_ctrl_miim(hw, phy->addr, PCH_GBE_HAL_MIIM_WRITE,
+				 offset, data);
+	return 0;
+}
+
+/**
+ * pch_gbe_phy_sw_reset - PHY software reset
+ * @hw:	            Pointer to the HW structure
+ */
+void pch_gbe_phy_sw_reset(struct pch_gbe_hw *hw)
+{
+	u16 phy_ctrl;
+
+	pch_gbe_phy_read_reg_miic(hw, PHY_CONTROL, &phy_ctrl);
+	phy_ctrl |= MII_CR_RESET;
+	pch_gbe_phy_write_reg_miic(hw, PHY_CONTROL, phy_ctrl);
+	udelay(1);
+}
+
+/**
+ * pch_gbe_phy_hw_reset - PHY hardware reset
+ * @hw:	   Pointer to the HW structure
+ */
+void pch_gbe_phy_hw_reset(struct pch_gbe_hw *hw)
+{
+	pch_gbe_phy_write_reg_miic(hw, PHY_CONTROL, PHY_CONTROL_DEFAULT);
+	pch_gbe_phy_write_reg_miic(hw, PHY_AUTONEG_ADV,
+					PHY_AUTONEG_ADV_DEFAULT);
+	pch_gbe_phy_write_reg_miic(hw, PHY_NEXT_PAGE_TX,
+					PHY_NEXT_PAGE_TX_DEFAULT);
+	pch_gbe_phy_write_reg_miic(hw, PHY_1000T_CTRL, PHY_1000T_CTRL_DEFAULT);
+	pch_gbe_phy_write_reg_miic(hw, PHY_PHYSP_CONTROL,
+					PHY_PHYSP_CONTROL_DEFAULT);
+}
+
+/**
+ * pch_gbe_phy_power_up - restore link in case the phy was powered down
+ * @hw:	   Pointer to the HW structure
+ */
+void pch_gbe_phy_power_up(struct pch_gbe_hw *hw)
+{
+	u16 mii_reg;
+
+	mii_reg = 0;
+	/* Just clear the power down bit to wake the phy back up */
+	/* according to the manual, the phy will retain its
+	 * settings across a power-down/up cycle */
+	pch_gbe_phy_read_reg_miic(hw, PHY_CONTROL, &mii_reg);
+	mii_reg &= ~MII_CR_POWER_DOWN;
+	pch_gbe_phy_write_reg_miic(hw, PHY_CONTROL, mii_reg);
+}
+
+/**
+ * pch_gbe_phy_power_down - Power down PHY
+ * @hw:	   Pointer to the HW structure
+ */
+void pch_gbe_phy_power_down(struct pch_gbe_hw *hw)
+{
+	u16 mii_reg;
+
+	mii_reg = 0;
+	/* Power down the PHY so no link is implied when interface is down *
+	 * The PHY cannot be powered down if any of the following is TRUE *
+	 * (a) WoL is enabled
+	 * (b) AMT is active
+	 */
+	pch_gbe_phy_read_reg_miic(hw, PHY_CONTROL, &mii_reg);
+	mii_reg |= MII_CR_POWER_DOWN;
+	pch_gbe_phy_write_reg_miic(hw, PHY_CONTROL, mii_reg);
+	mdelay(1);
+}
+
+/**
+ * pch_gbe_phy_set_rgmii - RGMII interface setting
+ * @hw:	            Pointer to the HW structure
+ */
+inline void pch_gbe_phy_set_rgmii(struct pch_gbe_hw *hw)
+{
+	pch_gbe_phy_sw_reset(hw);
+}
+
+/**
+ * pch_gbe_phy_init_setting - PHY initial setting
+ * @hw:	            Pointer to the HW structure
+ */
+void pch_gbe_phy_init_setting(struct pch_gbe_hw *hw)
+{
+	struct pch_gbe_adapter *adapter;
+	struct ethtool_cmd     cmd;
+	int ret;
+	u16 mii_reg;
+
+	adapter = container_of(hw, struct pch_gbe_adapter, hw);
+	ret = mii_ethtool_gset(&adapter->mii, &cmd);
+	if (ret)
+		pr_err("Error: mii_ethtool_gset\n");
+
+	cmd.speed = hw->mac.link_speed;
+	cmd.duplex = hw->mac.link_duplex;
+	cmd.advertising = hw->phy.autoneg_advertised;
+	cmd.autoneg = hw->mac.autoneg;
+	pch_gbe_phy_write_reg_miic(hw, MII_BMCR, BMCR_RESET);
+	ret = mii_ethtool_sset(&adapter->mii, &cmd);
+	if (ret)
+		pr_err("Error: mii_ethtool_sset\n");
+
+	pch_gbe_phy_sw_reset(hw);
+
+	pch_gbe_phy_read_reg_miic(hw, PHY_PHYSP_CONTROL, &mii_reg);
+	mii_reg |= PHYSP_CTRL_ASSERT_CRS_TX;
+	pch_gbe_phy_write_reg_miic(hw, PHY_PHYSP_CONTROL, mii_reg);
+
+}

drivers/net/pch_gbe/pch_gbe_phy.h

···
+/*
+ * Copyright (C) 1999 - 2010 Intel Corporation.
+ * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
+ *
+ * This code was derived from the Intel e1000e Linux driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+ */
+#ifndef _PCH_GBE_PHY_H_
+#define _PCH_GBE_PHY_H_
+
+#define PCH_GBE_PHY_REGS_LEN		32
+#define	PCH_GBE_PHY_RESET_DELAY_US	10
+#define PCH_GBE_MAC_IFOP_RGMII
+
+s32 pch_gbe_phy_get_id(struct pch_gbe_hw *hw);
+s32 pch_gbe_phy_read_reg_miic(struct pch_gbe_hw *hw, u32 offset, u16 *data);
+s32 pch_gbe_phy_write_reg_miic(struct pch_gbe_hw *hw, u32 offset, u16 data);
+void pch_gbe_phy_sw_reset(struct pch_gbe_hw *hw);
+void pch_gbe_phy_hw_reset(struct pch_gbe_hw *hw);
+void pch_gbe_phy_power_up(struct pch_gbe_hw *hw);
+void pch_gbe_phy_power_down(struct pch_gbe_hw *hw);
+void pch_gbe_phy_set_rgmii(struct pch_gbe_hw *hw);
+void pch_gbe_phy_init_setting(struct pch_gbe_hw *hw);
+
+#endif /* _PCH_GBE_PHY_H_ */