/*
 *  Copyright (c) 2014 Realtek Semiconductor Corp. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 */

#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/usb.h>
#include <linux/crc32.h>
#include <linux/if_vlan.h>
#include <linux/uaccess.h>
#include <linux/list.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/ip6_checksum.h>

/* Version Information */
#define DRIVER_VERSION "v1.06.0 (2014/03/03)"
#define DRIVER_AUTHOR "Realtek linux nic maintainers <nic_swsd@realtek.com>"
#define DRIVER_DESC "Realtek RTL8152/RTL8153 Based USB Ethernet Adapters"
#define MODULENAME "r8152"

#define R8152_PHY_ID		32

#define PLA_IDR			0xc000
#define PLA_RCR			0xc010
#define PLA_RMS			0xc016
#define PLA_RXFIFO_CTRL0	0xc0a0
#define PLA_RXFIFO_CTRL1	0xc0a4
#define PLA_RXFIFO_CTRL2	0xc0a8
#define PLA_FMC			0xc0b4
#define PLA_CFG_WOL		0xc0b6
#define PLA_TEREDO_CFG		0xc0bc
#define PLA_MAR			0xcd00
#define PLA_BACKUP		0xd000
#define PAL_BDC_CR		0xd1a0
#define PLA_TEREDO_TIMER	0xd2cc
#define PLA_REALWOW_TIMER	0xd2e8
#define PLA_LEDSEL		0xdd90
#define PLA_LED_FEATURE		0xdd92
#define PLA_PHYAR		0xde00
#define PLA_BOOT_CTRL		0xe004
#define PLA_GPHY_INTR_IMR	0xe022
#define PLA_EEE_CR		0xe040
#define PLA_EEEP_CR		0xe080
#define PLA_MAC_PWR_CTRL	0xe0c0
#define PLA_MAC_PWR_CTRL2	0xe0ca
#define PLA_MAC_PWR_CTRL3	0xe0cc
#define PLA_MAC_PWR_CTRL4	0xe0ce
#define PLA_WDT6_CTRL		0xe428
#define PLA_TCR0		0xe610
#define PLA_TCR1		0xe612
#define PLA_TXFIFO_CTRL		0xe618
#define PLA_RSTTALLY		0xe800
#define PLA_CR			0xe813
#define PLA_CRWECR		0xe81c
#define PLA_CONFIG12		0xe81e	/* CONFIG1, CONFIG2 */
#define PLA_CONFIG34		0xe820	/* CONFIG3, CONFIG4 */
#define PLA_CONFIG5		0xe822
#define PLA_PHY_PWR		0xe84c
#define PLA_OOB_CTRL		0xe84f
#define PLA_CPCR		0xe854
#define PLA_MISC_0		0xe858
#define PLA_MISC_1		0xe85a
#define PLA_OCP_GPHY_BASE	0xe86c
#define PLA_TALLYCNT		0xe890
#define PLA_SFF_STS_7		0xe8de
#define PLA_PHYSTATUS		0xe908
#define PLA_BP_BA		0xfc26
#define PLA_BP_0		0xfc28
#define PLA_BP_1		0xfc2a
#define PLA_BP_2		0xfc2c
#define PLA_BP_3		0xfc2e
#define PLA_BP_4		0xfc30
#define PLA_BP_5		0xfc32
#define PLA_BP_6		0xfc34
#define PLA_BP_7		0xfc36
#define PLA_BP_EN		0xfc38

#define USB_U2P3_CTRL		0xb460
#define USB_DEV_STAT		0xb808
#define USB_USB_CTRL		0xd406
#define USB_PHY_CTRL		0xd408
#define USB_TX_AGG		0xd40a
#define USB_RX_BUF_TH		0xd40c
#define USB_USB_TIMER		0xd428
#define USB_RX_EARLY_AGG	0xd42c
#define USB_PM_CTRL_STATUS	0xd432
#define USB_TX_DMA		0xd434
#define USB_TOLERANCE		0xd490
#define USB_LPM_CTRL		0xd41a
#define USB_UPS_CTRL		0xd800
#define USB_MISC_0		0xd81a
#define USB_POWER_CUT		0xd80a
#define USB_AFE_CTRL2		0xd824
#define USB_WDT11_CTRL		0xe43c
#define USB_BP_BA		0xfc26
#define USB_BP_0		0xfc28
#define USB_BP_1		0xfc2a
#define USB_BP_2		0xfc2c
#define USB_BP_3		0xfc2e
#define USB_BP_4		0xfc30
#define USB_BP_5		0xfc32
#define USB_BP_6		0xfc34
#define USB_BP_7		0xfc36
#define USB_BP_EN		0xfc38

/* OCP Registers */
#define OCP_ALDPS_CONFIG	0x2010
#define OCP_EEE_CONFIG1		0x2080
#define OCP_EEE_CONFIG2		0x2092
#define OCP_EEE_CONFIG3		0x2094
#define OCP_BASE_MII		0xa400
#define OCP_EEE_AR		0xa41a
#define OCP_EEE_DATA		0xa41c
#define OCP_PHY_STATUS		0xa420
#define OCP_POWER_CFG		0xa430
#define OCP_EEE_CFG		0xa432
#define OCP_SRAM_ADDR		0xa436
#define OCP_SRAM_DATA		0xa438
#define OCP_DOWN_SPEED		0xa442
#define OCP_EEE_CFG2		0xa5d0
#define OCP_ADC_CFG		0xbc06

/* SRAM Register */
#define SRAM_LPF_CFG		0x8012
#define SRAM_10M_AMP1		0x8080
#define SRAM_10M_AMP2		0x8082
#define SRAM_IMPEDANCE		0x8084

/* PLA_RCR */
#define RCR_AAP			0x00000001
#define RCR_APM			0x00000002
#define RCR_AM			0x00000004
#define RCR_AB			0x00000008
#define RCR_ACPT_ALL		(RCR_AAP | RCR_APM | RCR_AM | RCR_AB)

/* PLA_RXFIFO_CTRL0 */
#define RXFIFO_THR1_NORMAL	0x00080002
#define RXFIFO_THR1_OOB		0x01800003

/* PLA_RXFIFO_CTRL1 */
#define RXFIFO_THR2_FULL	0x00000060
#define RXFIFO_THR2_HIGH	0x00000038
#define RXFIFO_THR2_OOB		0x0000004a
#define RXFIFO_THR2_NORMAL	0x00a0

/* PLA_RXFIFO_CTRL2 */
#define RXFIFO_THR3_FULL	0x00000078
#define RXFIFO_THR3_HIGH	0x00000048
#define RXFIFO_THR3_OOB		0x0000005a
#define RXFIFO_THR3_NORMAL	0x0110

/* PLA_TXFIFO_CTRL */
#define TXFIFO_THR_NORMAL	0x00400008
#define TXFIFO_THR_NORMAL2	0x01000008

/* PLA_FMC */
#define FMC_FCR_MCU_EN		0x0001

/* PLA_EEEP_CR */
#define EEEP_CR_EEEP_TX		0x0002

/* PLA_WDT6_CTRL */
#define WDT6_SET_MODE		0x0010

/* PLA_TCR0 */
#define TCR0_TX_EMPTY		0x0800
#define TCR0_AUTO_FIFO		0x0080

/* PLA_TCR1 */
#define VERSION_MASK		0x7cf0

/* PLA_RSTTALLY */
#define TALLY_RESET		0x0001

/* PLA_CR */
#define CR_RST			0x10
#define CR_RE			0x08
#define CR_TE			0x04

/* PLA_CRWECR */
#define CRWECR_NORAML		0x00
#define CRWECR_CONFIG		0xc0

/* PLA_OOB_CTRL */
#define NOW_IS_OOB		0x80
#define TXFIFO_EMPTY		0x20
#define RXFIFO_EMPTY		0x10
#define LINK_LIST_READY		0x02
#define DIS_MCU_CLROOB		0x01
#define FIFO_EMPTY		(TXFIFO_EMPTY | RXFIFO_EMPTY)

/* PLA_MISC_1 */
#define RXDY_GATED_EN		0x0008

/* PLA_SFF_STS_7 */
#define RE_INIT_LL		0x8000
#define MCU_BORW_EN		0x4000

/* PLA_CPCR */
#define CPCR_RX_VLAN		0x0040

/* PLA_CFG_WOL */
#define MAGIC_EN		0x0001

/* PLA_TEREDO_CFG */
#define TEREDO_SEL		0x8000
#define TEREDO_WAKE_MASK	0x7f00
#define TEREDO_RS_EVENT_MASK	0x00fe
#define OOB_TEREDO_EN		0x0001

/* PAL_BDC_CR */
#define ALDPS_PROXY_MODE	0x0001

/* PLA_CONFIG34 */
#define LINK_ON_WAKE_EN		0x0010
#define LINK_OFF_WAKE_EN	0x0008

/* PLA_CONFIG5 */
#define BWF_EN			0x0040
#define MWF_EN			0x0020
#define UWF_EN			0x0010
#define LAN_WAKE_EN		0x0002

/* PLA_LED_FEATURE */
#define LED_MODE_MASK		0x0700

/* PLA_PHY_PWR */
#define TX_10M_IDLE_EN		0x0080
#define PFM_PWM_SWITCH		0x0040

/* PLA_MAC_PWR_CTRL */
#define D3_CLK_GATED_EN		0x00004000
#define MCU_CLK_RATIO		0x07010f07
#define MCU_CLK_RATIO_MASK	0x0f0f0f0f
#define ALDPS_SPDWN_RATIO	0x0f87

/* PLA_MAC_PWR_CTRL2 */
#define EEE_SPDWN_RATIO		0x8007

/* PLA_MAC_PWR_CTRL3 */
#define PKT_AVAIL_SPDWN_EN	0x0100
#define SUSPEND_SPDWN_EN	0x0004
#define U1U2_SPDWN_EN		0x0002
#define L1_SPDWN_EN		0x0001

/* PLA_MAC_PWR_CTRL4 */
#define PWRSAVE_SPDWN_EN	0x1000
#define RXDV_SPDWN_EN		0x0800
#define TX10MIDLE_EN		0x0100
#define TP100_SPDWN_EN		0x0020
#define TP500_SPDWN_EN		0x0010
#define TP1000_SPDWN_EN		0x0008
#define EEE_SPDWN_EN		0x0001

/* PLA_GPHY_INTR_IMR */
#define GPHY_STS_MSK		0x0001
#define SPEED_DOWN_MSK		0x0002
#define SPDWN_RXDV_MSK		0x0004
#define SPDWN_LINKCHG_MSK	0x0008

/* PLA_PHYAR */
#define PHYAR_FLAG		0x80000000

/* PLA_EEE_CR */
#define EEE_RX_EN		0x0001
#define EEE_TX_EN		0x0002

/* PLA_BOOT_CTRL */
#define AUTOLOAD_DONE		0x0002

/* USB_DEV_STAT */
#define STAT_SPEED_MASK		0x0006
#define STAT_SPEED_HIGH		0x0000
#define STAT_SPEED_FULL		0x0001

/* USB_TX_AGG */
#define TX_AGG_MAX_THRESHOLD	0x03

/* USB_RX_BUF_TH */
#define RX_THR_SUPPER		0x0c350180
#define RX_THR_HIGH		0x7a120180
#define RX_THR_SLOW		0xffff0180

/* USB_TX_DMA */
#define TEST_MODE_DISABLE	0x00000001
#define TX_SIZE_ADJUST1		0x00000100

/* USB_UPS_CTRL */
#define POWER_CUT		0x0100

/* USB_PM_CTRL_STATUS */
#define RESUME_INDICATE		0x0001

/* USB_USB_CTRL */
#define RX_AGG_DISABLE		0x0010

/* USB_U2P3_CTRL */
#define U2P3_ENABLE		0x0001

/* USB_POWER_CUT */
#define PWR_EN			0x0001
#define PHASE2_EN		0x0008

/* USB_MISC_0 */
#define PCUT_STATUS		0x0001

/* USB_RX_EARLY_AGG */
#define EARLY_AGG_SUPPER	0x0e832981
#define EARLY_AGG_HIGH		0x0e837a12
#define EARLY_AGG_SLOW		0x0e83ffff

/* USB_WDT11_CTRL */
#define TIMER11_EN		0x0001

/* USB_LPM_CTRL */
#define LPM_TIMER_MASK		0x0c
#define LPM_TIMER_500MS		0x04	/* 500 ms */
#define LPM_TIMER_500US		0x0c	/* 500 us */

/* USB_AFE_CTRL2 */
#define SEN_VAL_MASK		0xf800
#define SEN_VAL_NORMAL		0xa000
#define SEL_RXIDLE		0x0100

/* OCP_ALDPS_CONFIG */
#define ENPWRSAVE		0x8000
#define ENPDNPS			0x0200
#define LINKENA			0x0100
#define DIS_SDSAVE		0x0010

/* OCP_PHY_STATUS */
#define PHY_STAT_MASK		0x0007
#define PHY_STAT_LAN_ON		3
#define PHY_STAT_PWRDN		5

/* OCP_POWER_CFG */
#define EEE_CLKDIV_EN		0x8000
#define EN_ALDPS		0x0004
#define EN_10M_PLLOFF		0x0001

/* OCP_EEE_CONFIG1 */
#define RG_TXLPI_MSK_HFDUP	0x8000
#define RG_MATCLR_EN		0x4000
#define EEE_10_CAP		0x2000
#define EEE_NWAY_EN		0x1000
#define TX_QUIET_EN		0x0200
#define RX_QUIET_EN		0x0100
#define SDRISETIME		0x0010	/* bit 4 ~ 6 */
#define RG_RXLPI_MSK_HFDUP	0x0008
#define SDFALLTIME		0x0007	/* bit 0 ~ 2 */

/* OCP_EEE_CONFIG2 */
#define RG_LPIHYS_NUM		0x7000	/* bit 12 ~ 15 */
#define RG_DACQUIET_EN		0x0400
#define RG_LDVQUIET_EN		0x0200
#define RG_CKRSEL		0x0020
#define RG_EEEPRG_EN		0x0010

/* OCP_EEE_CONFIG3 */
#define FST_SNR_EYE_R		0x1500	/* bit 7 ~ 15 */
#define RG_LFS_SEL		0x0060	/* bit 6 ~ 5 */
#define MSK_PH			0x0006	/* bit 0 ~ 3 */

/* OCP_EEE_AR */
/* bit[15:14] function */
#define FUN_ADDR		0x0000
#define FUN_DATA		0x4000
/* bit[4:0] device addr */
#define DEVICE_ADDR		0x0007

/* OCP_EEE_DATA */
#define EEE_ADDR		0x003C
#define EEE_DATA		0x0002

/* OCP_EEE_CFG */
#define CTAP_SHORT_EN		0x0040
#define EEE10_EN		0x0010

/* OCP_DOWN_SPEED */
#define EN_10M_BGOFF		0x0080

/* OCP_EEE_CFG2 */
#define MY1000_EEE		0x0004
#define MY100_EEE		0x0002

/* OCP_ADC_CFG */
#define CKADSEL_L		0x0100
#define ADC_EN			0x0080
#define EN_EMI_L		0x0040

/* SRAM_LPF_CFG */
#define LPF_AUTO_TUNE		0x8000

/* SRAM_10M_AMP1 */
#define GDAC_IB_UPALL		0x0008

/* SRAM_10M_AMP2 */
#define AMP_DN			0x0200

/* SRAM_IMPEDANCE */
#define RX_DRIVING_MASK		0x6000

enum rtl_register_content {
	_1000bps	= 0x10,
	_100bps		= 0x08,
	_10bps		= 0x04,
	LINK_STATUS	= 0x02,
	FULL_DUP	= 0x01,
};

#define RTL8152_MAX_TX		10
#define RTL8152_MAX_RX		10
#define INTBUFSIZE		2
#define CRC_SIZE		4
#define TX_ALIGN		4
#define RX_ALIGN		8

#define INTR_LINK		0x0004

#define RTL8152_REQT_READ	0xc0
#define RTL8152_REQT_WRITE	0x40
#define RTL8152_REQ_GET_REGS	0x05
#define RTL8152_REQ_SET_REGS	0x05

#define BYTE_EN_DWORD		0xff
#define BYTE_EN_WORD		0x33
#define BYTE_EN_BYTE		0x11
#define BYTE_EN_SIX_BYTES	0x3f
#define BYTE_EN_START_MASK	0x0f
#define BYTE_EN_END_MASK	0xf0

#define RTL8152_RMS		(VLAN_ETH_FRAME_LEN + VLAN_HLEN)
#define RTL8152_TX_TIMEOUT	(HZ)

/* rtl8152 flags */
enum rtl8152_flags {
	RTL8152_UNPLUG = 0,
	RTL8152_SET_RX_MODE,
	WORK_ENABLE,
	RTL8152_LINK_CHG,
	SELECTIVE_SUSPEND,
	PHY_RESET,
	SCHEDULE_TASKLET,
};

/* Define these values to match your device */
#define VENDOR_ID_REALTEK		0x0bda
#define PRODUCT_ID_RTL8152		0x8152
#define PRODUCT_ID_RTL8153		0x8153

#define VENDOR_ID_SAMSUNG		0x04e8
#define PRODUCT_ID_SAMSUNG		0xa101

#define MCU_TYPE_PLA			0x0100
#define MCU_TYPE_USB			0x0000

#define REALTEK_USB_DEVICE(vend, prod)	\
	USB_DEVICE_INTERFACE_CLASS(vend, prod, USB_CLASS_VENDOR_SPEC)

struct tally_counter {
	__le64	tx_packets;
	__le64	rx_packets;
	__le64	tx_errors;
	__le32	rx_errors;
	__le16	rx_missed;
	__le16	align_errors;
	__le32	tx_one_collision;
	__le32	tx_multi_collision;
	__le64	rx_unicast;
	__le64	rx_broadcast;
	__le32	rx_multicast;
	__le16	tx_aborted;
	__le16	tx_underun;
};

struct rx_desc {
	__le32 opts1;
#define RX_LEN_MASK			0x7fff

	__le32 opts2;
#define RD_UDP_CS			(1 << 23)
#define RD_TCP_CS			(1 << 22)
#define RD_IPV6_CS			(1 << 20)
#define RD_IPV4_CS			(1 << 19)

	__le32 opts3;
#define IPF				(1 << 23) /* IP checksum fail */
#define UDPF				(1 << 22) /* UDP checksum fail */
#define TCPF				(1 << 21) /* TCP checksum fail */

	__le32 opts4;
	__le32 opts5;
	__le32 opts6;
};

struct tx_desc {
	__le32 opts1;
#define TX_FS			(1 << 31) /* First segment of a packet */
#define TX_LS			(1 << 30) /* Final segment of a packet */
#define GTSENDV4		(1 << 28)
#define GTSENDV6		(1 << 27)
#define GTTCPHO_SHIFT		18
#define GTTCPHO_MAX		0x7fU
#define TX_LEN_MAX		0x3ffffU

	__le32 opts2;
#define UDP_CS			(1 << 31) /* Calculate UDP/IP checksum */
#define TCP_CS			(1 << 30) /* Calculate TCP/IP checksum */
#define IPV4_CS			(1 << 29) /* Calculate IPv4 checksum */
#define IPV6_CS			(1 << 28) /* Calculate IPv6 checksum */
#define MSS_SHIFT		17
#define MSS_MAX			0x7ffU
#define TCPHO_SHIFT		17
#define TCPHO_MAX		0x7ffU
};

struct r8152;

struct rx_agg {
	struct list_head list;
	struct urb *urb;
	struct r8152 *context;
	void *buffer;
	void *head;
};

struct tx_agg {
	struct list_head list;
	struct urb *urb;
	struct r8152 *context;
	void *buffer;
	void *head;
	u32 skb_num;
	u32 skb_len;
};

struct r8152 {
	unsigned long flags;
	struct usb_device *udev;
	struct tasklet_struct tl;
	struct usb_interface *intf;
	struct net_device *netdev;
	struct urb *intr_urb;
	struct tx_agg tx_info[RTL8152_MAX_TX];
	struct rx_agg rx_info[RTL8152_MAX_RX];
	struct list_head rx_done, tx_free;
	struct sk_buff_head tx_queue;
	spinlock_t rx_lock, tx_lock;
	struct delayed_work schedule;
	struct mii_if_info mii;

	struct rtl_ops {
		void (*init)(struct r8152 *);
		int (*enable)(struct r8152 *);
		void (*disable)(struct r8152 *);
		void (*up)(struct r8152 *);
		void (*down)(struct r8152 *);
		void (*unload)(struct r8152 *);
	} rtl_ops;

	int intr_interval;
	u32 saved_wolopts;
	u32 msg_enable;
	u32 tx_qlen;
	u16 ocp_base;
	u8 *intr_buff;
	u8 version;
	u8 speed;
};

enum rtl_version {
	RTL_VER_UNKNOWN = 0,
	RTL_VER_01,
	RTL_VER_02,
	RTL_VER_03,
	RTL_VER_04,
	RTL_VER_05,
	RTL_VER_MAX
};

enum tx_csum_stat {
	TX_CSUM_SUCCESS = 0,
	TX_CSUM_TSO,
	TX_CSUM_NONE
};

/* Maximum number of multicast addresses to filter (vs. Rx-all-multicast).
 * The RTL chips use a 64 element hash table based on the Ethernet CRC.
 */
static const int multicast_filter_limit = 32;
static unsigned int rx_buf_sz = 16384;

#define RTL_LIMITED_TSO_SIZE	(rx_buf_sz - sizeof(struct tx_desc) - \
				 VLAN_ETH_HLEN - VLAN_HLEN)

static
int get_registers(struct r8152 *tp, u16 value, u16 index, u16 size, void *data)
{
	int ret;
	void *tmp;

	tmp = kmalloc(size, GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	ret = usb_control_msg(tp->udev, usb_rcvctrlpipe(tp->udev, 0),
			       RTL8152_REQ_GET_REGS, RTL8152_REQT_READ,
			       value, index, tmp, size, 500);

	memcpy(data, tmp, size);
	kfree(tmp);

	return ret;
}

static
int set_registers(struct r8152 *tp, u16 value, u16 index, u16 size, void *data)
{
	int ret;
	void *tmp;

	tmp = kmalloc(size, GFP_KERNEL);
	if (!tmp)
		return -ENOMEM;

	memcpy(tmp, data, size);

	ret = usb_control_msg(tp->udev, usb_sndctrlpipe(tp->udev, 0),
			       RTL8152_REQ_SET_REGS, RTL8152_REQT_WRITE,
			       value, index, tmp, size, 500);

	kfree(tmp);

	return ret;
}

static int generic_ocp_read(struct r8152 *tp, u16 index, u16 size,
				void *data, u16 type)
{
	u16 limit = 64;
	int ret = 0;

	if (test_bit(RTL8152_UNPLUG, &tp->flags))
		return -ENODEV;

	/* both size and indix must be 4 bytes align */
	if ((size & 3) || !size || (index & 3) || !data)
		return -EPERM;

	if ((u32)index + (u32)size > 0xffff)
		return -EPERM;

	while (size) {
		if (size > limit) {
			ret = get_registers(tp, index, type, limit, data);
			if (ret < 0)
				break;

			index += limit;
			data += limit;
			size -= limit;
		} else {
			ret = get_registers(tp, index, type, size, data);
			if (ret < 0)
				break;

			index += size;
			data += size;
			size = 0;
			break;
		}
	}

	return ret;
}

static int generic_ocp_write(struct r8152 *tp, u16 index, u16 byteen,
				u16 size, void *data, u16 type)
{
	int ret;
	u16 byteen_start, byteen_end, byen;
	u16 limit = 512;

	if (test_bit(RTL8152_UNPLUG, &tp->flags))
		return -ENODEV;

	/* both size and indix must be 4 bytes align */
	if ((size & 3) || !size || (index & 3) || !data)
		return -EPERM;

	if ((u32)index + (u32)size > 0xffff)
		return -EPERM;

	byteen_start = byteen & BYTE_EN_START_MASK;
	byteen_end = byteen & BYTE_EN_END_MASK;

	byen = byteen_start | (byteen_start << 4);
	ret = set_registers(tp, index, type | byen, 4, data);
	if (ret < 0)
		goto error1;

	index += 4;
	data += 4;
	size -= 4;

	if (size) {
		size -= 4;

		while (size) {
			if (size > limit) {
				ret = set_registers(tp, index,
					type | BYTE_EN_DWORD,
					limit, data);
				if (ret < 0)
					goto error1;

				index += limit;
				data += limit;
				size -= limit;
			} else {
				ret = set_registers(tp, index,
					type | BYTE_EN_DWORD,
					size, data);
				if (ret < 0)
					goto error1;

				index += size;
				data += size;
				size = 0;
				break;
			}
		}

		byen = byteen_end | (byteen_end >> 4);
		ret = set_registers(tp, index, type | byen, 4, data);
		if (ret < 0)
			goto error1;
	}

error1:
	return ret;
}

static inline
int pla_ocp_read(struct r8152 *tp, u16 index, u16 size, void *data)
{
	return generic_ocp_read(tp, index, size, data, MCU_TYPE_PLA);
}

static inline
int pla_ocp_write(struct r8152 *tp, u16 index, u16 byteen, u16 size, void *data)
{
	return generic_ocp_write(tp, index, byteen, size, data, MCU_TYPE_PLA);
}

static inline
int usb_ocp_read(struct r8152 *tp, u16 index, u16 size, void *data)
{
	return generic_ocp_read(tp, index, size, data, MCU_TYPE_USB);
}

static inline
int usb_ocp_write(struct r8152 *tp, u16 index, u16 byteen, u16 size, void *data)
{
	return generic_ocp_write(tp, index, byteen, size, data, MCU_TYPE_USB);
}

static u32 ocp_read_dword(struct r8152 *tp, u16 type, u16 index)
{
	__le32 data;

	generic_ocp_read(tp, index, sizeof(data), &data, type);

	return __le32_to_cpu(data);
}

static void ocp_write_dword(struct r8152 *tp, u16 type, u16 index, u32 data)
{
	__le32 tmp = __cpu_to_le32(data);

	generic_ocp_write(tp, index, BYTE_EN_DWORD, sizeof(tmp), &tmp, type);
}

static u16 ocp_read_word(struct r8152 *tp, u16 type, u16 index)
{
	u32 data;
	__le32 tmp;
	u8 shift = index & 2;

	index &= ~3;

	generic_ocp_read(tp, index, sizeof(tmp), &tmp, type);

	data = __le32_to_cpu(tmp);
	data >>= (shift * 8);
	data &= 0xffff;

	return (u16)data;
}

static void ocp_write_word(struct r8152 *tp, u16 type, u16 index, u32 data)
{
	u32 mask = 0xffff;
	__le32 tmp;
	u16 byen = BYTE_EN_WORD;
	u8 shift = index & 2;

	data &= mask;

	if (index & 2) {
		byen <<= shift;
		mask <<= (shift * 8);
		data <<= (shift * 8);
		index &= ~3;
	}

	generic_ocp_read(tp, index, sizeof(tmp), &tmp, type);

	data |= __le32_to_cpu(tmp) & ~mask;
	tmp = __cpu_to_le32(data);

	generic_ocp_write(tp, index, byen, sizeof(tmp), &tmp, type);
}

static u8 ocp_read_byte(struct r8152 *tp, u16 type, u16 index)
{
	u32 data;
	__le32 tmp;
	u8 shift = index & 3;

	index &= ~3;

	generic_ocp_read(tp, index, sizeof(tmp), &tmp, type);

	data = __le32_to_cpu(tmp);
	data >>= (shift * 8);
	data &= 0xff;

	return (u8)data;
}

static void ocp_write_byte(struct r8152 *tp, u16 type, u16 index, u32 data)
{
	u32 mask = 0xff;
	__le32 tmp;
	u16 byen = BYTE_EN_BYTE;
	u8 shift = index & 3;

	data &= mask;

	if (index & 3) {
		byen <<= shift;
		mask <<= (shift * 8);
		data <<= (shift * 8);
		index &= ~3;
	}

	generic_ocp_read(tp, index, sizeof(tmp), &tmp, type);

	data |= __le32_to_cpu(tmp) & ~mask;
	tmp = __cpu_to_le32(data);

	generic_ocp_write(tp, index, byen, sizeof(tmp), &tmp, type);
}

static u16 ocp_reg_read(struct r8152 *tp, u16 addr)
{
	u16 ocp_base, ocp_index;

	ocp_base = addr & 0xf000;
	if (ocp_base != tp->ocp_base) {
		ocp_write_word(tp, MCU_TYPE_PLA, PLA_OCP_GPHY_BASE, ocp_base);
		tp->ocp_base = ocp_base;
	}

	ocp_index = (addr & 0x0fff) | 0xb000;
	return ocp_read_word(tp, MCU_TYPE_PLA, ocp_index);
}

static void ocp_reg_write(struct r8152 *tp, u16 addr, u16 data)
{
	u16 ocp_base, ocp_index;

	ocp_base = addr & 0xf000;
	if (ocp_base != tp->ocp_base) {
		ocp_write_word(tp, MCU_TYPE_PLA, PLA_OCP_GPHY_BASE, ocp_base);
		tp->ocp_base = ocp_base;
	}

	ocp_index = (addr & 0x0fff) | 0xb000;
	ocp_write_word(tp, MCU_TYPE_PLA, ocp_index, data);
}

static inline void r8152_mdio_write(struct r8152 *tp, u32 reg_addr, u32 value)
{
	ocp_reg_write(tp, OCP_BASE_MII + reg_addr * 2, value);
}

static inline int r8152_mdio_read(struct r8152 *tp, u32 reg_addr)
{
	return ocp_reg_read(tp, OCP_BASE_MII + reg_addr * 2);
}

static void sram_write(struct r8152 *tp, u16 addr, u16 data)
{
	ocp_reg_write(tp, OCP_SRAM_ADDR, addr);
	ocp_reg_write(tp, OCP_SRAM_DATA, data);
}

static u16 sram_read(struct r8152 *tp, u16 addr)
{
	ocp_reg_write(tp, OCP_SRAM_ADDR, addr);
	return ocp_reg_read(tp, OCP_SRAM_DATA);
}

static int read_mii_word(struct net_device *netdev, int phy_id, int reg)
{
	struct r8152 *tp = netdev_priv(netdev);
	int ret;

	if (phy_id != R8152_PHY_ID)
		return -EINVAL;

	ret = usb_autopm_get_interface(tp->intf);
	if (ret < 0)
		goto out;

	ret = r8152_mdio_read(tp, reg);

	usb_autopm_put_interface(tp->intf);

out:
	return ret;
}

static
void write_mii_word(struct net_device *netdev, int phy_id, int reg, int val)
{
	struct r8152 *tp = netdev_priv(netdev);

	if (phy_id != R8152_PHY_ID)
		return;

	if (usb_autopm_get_interface(tp->intf) < 0)
		return;

	r8152_mdio_write(tp, reg, val);

	usb_autopm_put_interface(tp->intf);
}

static
int r8152_submit_rx(struct r8152 *tp, struct rx_agg *agg, gfp_t mem_flags);

static inline void set_ethernet_addr(struct r8152 *tp)
{
	struct net_device *dev = tp->netdev;
	int ret;
	u8 node_id[8] = {0};

	if (tp->version == RTL_VER_01)
		ret = pla_ocp_read(tp, PLA_IDR, sizeof(node_id), node_id);
	else
		ret = pla_ocp_read(tp, PLA_BACKUP, sizeof(node_id), node_id);

	if (ret < 0) {
		netif_notice(tp, probe, dev, "inet addr fail\n");
	} else {
		if (tp->version != RTL_VER_01) {
			ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CRWECR,
				       CRWECR_CONFIG);
			pla_ocp_write(tp, PLA_IDR, BYTE_EN_SIX_BYTES,
				      sizeof(node_id), node_id);
			ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CRWECR,
				       CRWECR_NORAML);
		}

		memcpy(dev->dev_addr, node_id, dev->addr_len);
		memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
	}
}

static int rtl8152_set_mac_address(struct net_device *netdev, void *p)
{
	struct r8152 *tp = netdev_priv(netdev);
	struct sockaddr *addr = p;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);

	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CRWECR, CRWECR_CONFIG);
	pla_ocp_write(tp, PLA_IDR, BYTE_EN_SIX_BYTES, 8, addr->sa_data);
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CRWECR, CRWECR_NORAML);

	return 0;
}

static void read_bulk_callback(struct urb *urb)
{
	struct net_device *netdev;
	int status = urb->status;
	struct rx_agg *agg;
	struct r8152 *tp;
	int result;

	agg = urb->context;
	if (!agg)
		return;

	tp = agg->context;
	if (!tp)
		return;

	if (test_bit(RTL8152_UNPLUG, &tp->flags))
		return;

	if (!test_bit(WORK_ENABLE, &tp->flags))
		return;

	netdev = tp->netdev;

	/* When link down, the driver would cancel all bulks. */
	/* This avoid the re-submitting bulk */
	if (!netif_carrier_ok(netdev))
		return;

	usb_mark_last_busy(tp->udev);

	switch (status) {
	case 0:
		if (urb->actual_length < ETH_ZLEN)
			break;

		spin_lock(&tp->rx_lock);
		list_add_tail(&agg->list, &tp->rx_done);
		spin_unlock(&tp->rx_lock);
		tasklet_schedule(&tp->tl);
		return;
	case -ESHUTDOWN:
		set_bit(RTL8152_UNPLUG, &tp->flags);
		netif_device_detach(tp->netdev);
		return;
	case -ENOENT:
		return;	/* the urb is in unlink state */
	case -ETIME:
		if (net_ratelimit())
			netdev_warn(netdev, "maybe reset is needed?\n");
		break;
	default:
		if (net_ratelimit())
			netdev_warn(netdev, "Rx status %d\n", status);
		break;
	}

	result = r8152_submit_rx(tp, agg, GFP_ATOMIC);
	if (result == -ENODEV) {
		netif_device_detach(tp->netdev);
	} else if (result) {
		spin_lock(&tp->rx_lock);
		list_add_tail(&agg->list, &tp->rx_done);
		spin_unlock(&tp->rx_lock);
		tasklet_schedule(&tp->tl);
	}
}

static void write_bulk_callback(struct urb *urb)
{
	struct net_device_stats *stats;
	struct net_device *netdev;
	struct tx_agg *agg;
	struct r8152 *tp;
	int status = urb->status;

	agg = urb->context;
	if (!agg)
		return;

	tp = agg->context;
	if (!tp)
		return;

	netdev = tp->netdev;
	stats = &netdev->stats;
	if (status) {
		if (net_ratelimit())
			netdev_warn(netdev, "Tx status %d\n", status);
		stats->tx_errors += agg->skb_num;
	} else {
		stats->tx_packets += agg->skb_num;
		stats->tx_bytes += agg->skb_len;
	}

	spin_lock(&tp->tx_lock);
	list_add_tail(&agg->list, &tp->tx_free);
	spin_unlock(&tp->tx_lock);

	usb_autopm_put_interface_async(tp->intf);

	if (!netif_carrier_ok(netdev))
		return;

	if (!test_bit(WORK_ENABLE, &tp->flags))
		return;

	if (test_bit(RTL8152_UNPLUG, &tp->flags))
		return;

	if (!skb_queue_empty(&tp->tx_queue))
		tasklet_schedule(&tp->tl);
}

static void intr_callback(struct urb *urb)
{
	struct r8152 *tp;
	__le16 *d;
	int status = urb->status;
	int res;

	tp = urb->context;
	if (!tp)
		return;

	if (!test_bit(WORK_ENABLE, &tp->flags))
		return;

	if (test_bit(RTL8152_UNPLUG, &tp->flags))
		return;

	switch (status) {
	case 0:			/* success */
		break;
	case -ECONNRESET:	/* unlink */
	case -ESHUTDOWN:
		netif_device_detach(tp->netdev);
	case -ENOENT:
		return;
	case -EOVERFLOW:
		netif_info(tp, intr, tp->netdev, "intr status -EOVERFLOW\n");
		goto resubmit;
	/* -EPIPE:  should clear the halt */
	default:
		netif_info(tp, intr, tp->netdev, "intr status %d\n", status);
		goto resubmit;
	}

	d = urb->transfer_buffer;
	if (INTR_LINK & __le16_to_cpu(d[0])) {
		if (!(tp->speed & LINK_STATUS)) {
			set_bit(RTL8152_LINK_CHG, &tp->flags);
			schedule_delayed_work(&tp->schedule, 0);
		}
	} else {
		if (tp->speed & LINK_STATUS) {
			set_bit(RTL8152_LINK_CHG, &tp->flags);
			schedule_delayed_work(&tp->schedule, 0);
		}
	}

resubmit:
	res = usb_submit_urb(urb, GFP_ATOMIC);
	if (res == -ENODEV)
		netif_device_detach(tp->netdev);
	else if (res)
		netif_err(tp, intr, tp->netdev,
			  "can't resubmit intr, status %d\n", res);
}

static inline void *rx_agg_align(void *data)
{
	return (void *)ALIGN((uintptr_t)data, RX_ALIGN);
}

static inline void *tx_agg_align(void *data)
{
	return (void *)ALIGN((uintptr_t)data, TX_ALIGN);
}

static void free_all_mem(struct r8152 *tp)
{
	int i;

	for (i = 0; i < RTL8152_MAX_RX; i++) {
		usb_free_urb(tp->rx_info[i].urb);
		tp->rx_info[i].urb = NULL;

		kfree(tp->rx_info[i].buffer);
		tp->rx_info[i].buffer = NULL;
		tp->rx_info[i].head = NULL;
	}

	for (i = 0; i < RTL8152_MAX_TX; i++) {
		usb_free_urb(tp->tx_info[i].urb);
		tp->tx_info[i].urb = NULL;

		kfree(tp->tx_info[i].buffer);
		tp->tx_info[i].buffer = NULL;
		tp->tx_info[i].head = NULL;
	}

	usb_free_urb(tp->intr_urb);
	tp->intr_urb = NULL;

	kfree(tp->intr_buff);
	tp->intr_buff = NULL;
}

static int alloc_all_mem(struct r8152 *tp)
{
	struct net_device *netdev = tp->netdev;
	struct usb_interface *intf = tp->intf;
	struct usb_host_interface *alt = intf->cur_altsetting;
	struct usb_host_endpoint *ep_intr = alt->endpoint + 2;
	struct urb *urb;
	int node, i;
	u8 *buf;

	node = netdev->dev.parent ? dev_to_node(netdev->dev.parent) : -1;

	spin_lock_init(&tp->rx_lock);
	spin_lock_init(&tp->tx_lock);
	INIT_LIST_HEAD(&tp->rx_done);
	INIT_LIST_HEAD(&tp->tx_free);
	skb_queue_head_init(&tp->tx_queue);

	for (i = 0; i < RTL8152_MAX_RX; i++) {
		buf = kmalloc_node(rx_buf_sz, GFP_KERNEL, node);
		if (!buf)
			goto err1;

		if (buf != rx_agg_align(buf)) {
			kfree(buf);
			buf = kmalloc_node(rx_buf_sz + RX_ALIGN, GFP_KERNEL,
					   node);
			if (!buf)
				goto err1;
		}

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			kfree(buf);
			goto err1;
		}

		INIT_LIST_HEAD(&tp->rx_info[i].list);
		tp->rx_info[i].context = tp;
		tp->rx_info[i].urb = urb;
		tp->rx_info[i].buffer = buf;
		tp->rx_info[i].head = rx_agg_align(buf);
	}

	for (i = 0; i < RTL8152_MAX_TX; i++) {
		buf = kmalloc_node(rx_buf_sz, GFP_KERNEL, node);
		if (!buf)
			goto err1;

		if (buf != tx_agg_align(buf)) {
			kfree(buf);
			buf = kmalloc_node(rx_buf_sz + TX_ALIGN, GFP_KERNEL,
					   node);
			if (!buf)
				goto err1;
		}

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			kfree(buf);
			goto err1;
		}

		INIT_LIST_HEAD(&tp->tx_info[i].list);
		tp->tx_info[i].context = tp;
		tp->tx_info[i].urb = urb;
		tp->tx_info[i].buffer = buf;
		tp->tx_info[i].head = tx_agg_align(buf);

		list_add_tail(&tp->tx_info[i].list, &tp->tx_free);
	}

	tp->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!tp->intr_urb)
		goto err1;

	tp->intr_buff = kmalloc(INTBUFSIZE, GFP_KERNEL);
	if (!tp->intr_buff)
		goto err1;

	tp->intr_interval = (int)ep_intr->desc.bInterval;
	usb_fill_int_urb(tp->intr_urb, tp->udev, usb_rcvintpipe(tp->udev, 3),
		     tp->intr_buff, INTBUFSIZE, intr_callback,
		     tp, tp->intr_interval);

	return 0;

err1:
	free_all_mem(tp);
	return -ENOMEM;
}

static struct tx_agg *r8152_get_tx_agg(struct r8152 *tp)
{
	struct tx_agg *agg = NULL;
	unsigned long flags;

	if (list_empty(&tp->tx_free))
		return NULL;

	spin_lock_irqsave(&tp->tx_lock, flags);
	if (!list_empty(&tp->tx_free)) {
		struct list_head *cursor;

		cursor = tp->tx_free.next;
		list_del_init(cursor);
		agg = list_entry(cursor, struct tx_agg, list);
	}
	spin_unlock_irqrestore(&tp->tx_lock, flags);

	return agg;
}

static inline __be16 get_protocol(struct sk_buff *skb)
{
	__be16 protocol;

	if (skb->protocol == htons(ETH_P_8021Q))
		protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
	else
		protocol = skb->protocol;

	return protocol;
}

/*
 * r8152_csum_workaround()
 * The hw limites the value the transport offset. When the offset is out of the
 * range, calculate the checksum by sw.
 */
static void r8152_csum_workaround(struct r8152 *tp, struct sk_buff *skb,
				  struct sk_buff_head *list)
{
	if (skb_shinfo(skb)->gso_size) {
		netdev_features_t features = tp->netdev->features;
		struct sk_buff_head seg_list;
		struct sk_buff *segs, *nskb;

		features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO);
		segs = skb_gso_segment(skb, features);
		if (IS_ERR(segs) || !segs)
			goto drop;

		__skb_queue_head_init(&seg_list);

		do {
			nskb = segs;
			segs = segs->next;
			nskb->next = NULL;
			__skb_queue_tail(&seg_list, nskb);
		} while (segs);

		skb_queue_splice(&seg_list, list);
		dev_kfree_skb(skb);
	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
		if (skb_checksum_help(skb) < 0)
			goto drop;

		__skb_queue_head(list, skb);
	} else {
		struct net_device_stats *stats;

drop:
		stats = &tp->netdev->stats;
		stats->tx_dropped++;
		dev_kfree_skb(skb);
	}
}

/*
 * msdn_giant_send_check()
 * According to the document of microsoft, the TCP Pseudo Header excludes the
 * packet length for IPv6 TCP large packets.
 */
static int msdn_giant_send_check(struct sk_buff *skb)
{
	const struct ipv6hdr *ipv6h;
	struct tcphdr *th;
	int ret;

	ret = skb_cow_head(skb, 0);
	if (ret)
		return ret;

	ipv6h = ipv6_hdr(skb);
	th = tcp_hdr(skb);

	th->check = 0;
	th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);

	return ret;
}

static int r8152_tx_csum(struct r8152 *tp, struct tx_desc *desc,
			 struct sk_buff *skb, u32 len, u32 transport_offset)
{
	u32 mss = skb_shinfo(skb)->gso_size;
	u32 opts1, opts2 = 0;
	int ret = TX_CSUM_SUCCESS;

	WARN_ON_ONCE(len > TX_LEN_MAX);

	opts1 = len | TX_FS | TX_LS;

	if (mss) {
		if (transport_offset > GTTCPHO_MAX) {
			netif_warn(tp, tx_err, tp->netdev,
				   "Invalid transport offset 0x%x for TSO\n",
				   transport_offset);
			ret = TX_CSUM_TSO;
			goto unavailable;
		}

		switch (get_protocol(skb)) {
		case htons(ETH_P_IP):
			opts1 |= GTSENDV4;
			break;

		case htons(ETH_P_IPV6):
			if (msdn_giant_send_check(skb)) {
				ret = TX_CSUM_TSO;
				goto unavailable;
			}
			opts1 |= GTSENDV6;
			break;

		default:
			WARN_ON_ONCE(1);
			break;
		}

		opts1 |= transport_offset << GTTCPHO_SHIFT;
		opts2 |= min(mss, MSS_MAX) << MSS_SHIFT;
	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
		u8 ip_protocol;

		if (transport_offset > TCPHO_MAX) {
			netif_warn(tp, tx_err, tp->netdev,
				   "Invalid transport offset 0x%x\n",
				   transport_offset);
			ret = TX_CSUM_NONE;
			goto unavailable;
		}

		switch (get_protocol(skb)) {
		case htons(ETH_P_IP):
			opts2 |= IPV4_CS;
			ip_protocol = ip_hdr(skb)->protocol;
			break;

		case htons(ETH_P_IPV6):
			opts2 |= IPV6_CS;
			ip_protocol = ipv6_hdr(skb)->nexthdr;
			break;

		default:
			ip_protocol = IPPROTO_RAW;
			break;
		}

		if (ip_protocol == IPPROTO_TCP)
			opts2 |= TCP_CS;
		else if (ip_protocol == IPPROTO_UDP)
			opts2 |= UDP_CS;
		else
			WARN_ON_ONCE(1);

		opts2 |= transport_offset << TCPHO_SHIFT;
	}

	desc->opts2 = cpu_to_le32(opts2);
	desc->opts1 = cpu_to_le32(opts1);

unavailable:
	return ret;
}

static int r8152_tx_agg_fill(struct r8152 *tp, struct tx_agg *agg)
{
	struct sk_buff_head skb_head, *tx_queue = &tp->tx_queue;
	int remain, ret;
	u8 *tx_data;

	__skb_queue_head_init(&skb_head);
	spin_lock(&tx_queue->lock);
	skb_queue_splice_init(tx_queue, &skb_head);
	spin_unlock(&tx_queue->lock);

	tx_data = agg->head;
	agg->skb_num = agg->skb_len = 0;
	remain = rx_buf_sz;

	while (remain >= ETH_ZLEN + sizeof(struct tx_desc)) {
		struct tx_desc *tx_desc;
		struct sk_buff *skb;
		unsigned int len;
		u32 offset;

		skb = __skb_dequeue(&skb_head);
		if (!skb)
			break;

		len = skb->len + sizeof(*tx_desc);

		if (len > remain) {
			__skb_queue_head(&skb_head, skb);
			break;
		}

		tx_data = tx_agg_align(tx_data);
		tx_desc = (struct tx_desc *)tx_data;

		offset = (u32)skb_transport_offset(skb);

		if (r8152_tx_csum(tp, tx_desc, skb, skb->len, offset)) {
			r8152_csum_workaround(tp, skb, &skb_head);
			continue;
		}

		tx_data += sizeof(*tx_desc);

		len = skb->len;
		if (skb_copy_bits(skb, 0, tx_data, len) < 0) {
			struct net_device_stats *stats = &tp->netdev->stats;

			stats->tx_dropped++;
			dev_kfree_skb_any(skb);
			tx_data -= sizeof(*tx_desc);
			continue;
		}

		tx_data += len;
		agg->skb_len += len;
		agg->skb_num++;

		dev_kfree_skb_any(skb);

		remain = rx_buf_sz - (int)(tx_agg_align(tx_data) - agg->head);
	}

	if (!skb_queue_empty(&skb_head)) {
		spin_lock(&tx_queue->lock);
		skb_queue_splice(&skb_head, tx_queue);
		spin_unlock(&tx_queue->lock);
	}

	netif_tx_lock(tp->netdev);

	if (netif_queue_stopped(tp->netdev) &&
	    skb_queue_len(&tp->tx_queue) < tp->tx_qlen)
		netif_wake_queue(tp->netdev);

	netif_tx_unlock(tp->netdev);

	ret = usb_autopm_get_interface_async(tp->intf);
	if (ret < 0)
		goto out_tx_fill;

	usb_fill_bulk_urb(agg->urb, tp->udev, usb_sndbulkpipe(tp->udev, 2),
			  agg->head, (int)(tx_data - (u8 *)agg->head),
			  (usb_complete_t)write_bulk_callback, agg);

	ret = usb_submit_urb(agg->urb, GFP_ATOMIC);
	if (ret < 0)
		usb_autopm_put_interface_async(tp->intf);

out_tx_fill:
	return ret;
}

static u8 r8152_rx_csum(struct r8152 *tp, struct rx_desc *rx_desc)
{
	u8 checksum = CHECKSUM_NONE;
	u32 opts2, opts3;

	if (tp->version == RTL_VER_01)
		goto return_result;

	opts2 = le32_to_cpu(rx_desc->opts2);
	opts3 = le32_to_cpu(rx_desc->opts3);

	if (opts2 & RD_IPV4_CS) {
		if (opts3 & IPF)
			checksum = CHECKSUM_NONE;
		else if ((opts2 & RD_UDP_CS) && (opts3 & UDPF))
			checksum = CHECKSUM_NONE;
		else if ((opts2 & RD_TCP_CS) && (opts3 & TCPF))
			checksum = CHECKSUM_NONE;
		else
			checksum = CHECKSUM_UNNECESSARY;
	} else if (RD_IPV6_CS) {
		if ((opts2 & RD_UDP_CS) && !(opts3 & UDPF))
			checksum = CHECKSUM_UNNECESSARY;
		else if ((opts2 & RD_TCP_CS) && !(opts3 & TCPF))
			checksum = CHECKSUM_UNNECESSARY;
	}

return_result:
	return checksum;
}

static void rx_bottom(struct r8152 *tp)
{
	unsigned long flags;
	struct list_head *cursor, *next, rx_queue;

	if (list_empty(&tp->rx_done))
		return;

	INIT_LIST_HEAD(&rx_queue);
	spin_lock_irqsave(&tp->rx_lock, flags);
	list_splice_init(&tp->rx_done, &rx_queue);
	spin_unlock_irqrestore(&tp->rx_lock, flags);

	list_for_each_safe(cursor, next, &rx_queue) {
		struct rx_desc *rx_desc;
		struct rx_agg *agg;
		int len_used = 0;
		struct urb *urb;
		u8 *rx_data;
		int ret;

		list_del_init(cursor);

		agg = list_entry(cursor, struct rx_agg, list);
		urb = agg->urb;
		if (urb->actual_length < ETH_ZLEN)
			goto submit;

		rx_desc = agg->head;
		rx_data = agg->head;
		len_used += sizeof(struct rx_desc);

		while (urb->actual_length > len_used) {
			struct net_device *netdev = tp->netdev;
			struct net_device_stats *stats = &netdev->stats;
			unsigned int pkt_len;
			struct sk_buff *skb;

			pkt_len = le32_to_cpu(rx_desc->opts1) & RX_LEN_MASK;
			if (pkt_len < ETH_ZLEN)
				break;

			len_used += pkt_len;
			if (urb->actual_length < len_used)
				break;

			pkt_len -= CRC_SIZE;
			rx_data += sizeof(struct rx_desc);

			skb = netdev_alloc_skb_ip_align(netdev, pkt_len);
			if (!skb) {
				stats->rx_dropped++;
				goto find_next_rx;
			}

			skb->ip_summed = r8152_rx_csum(tp, rx_desc);
			memcpy(skb->data, rx_data, pkt_len);
			skb_put(skb, pkt_len);
			skb->protocol = eth_type_trans(skb, netdev);
			netif_receive_skb(skb);
			stats->rx_packets++;
			stats->rx_bytes += pkt_len;

find_next_rx:
			rx_data = rx_agg_align(rx_data + pkt_len + CRC_SIZE);
			rx_desc = (struct rx_desc *)rx_data;
			len_used = (int)(rx_data - (u8 *)agg->head);
			len_used += sizeof(struct rx_desc);
		}

submit:
		ret = r8152_submit_rx(tp, agg, GFP_ATOMIC);
		if (ret && ret != -ENODEV) {
			spin_lock_irqsave(&tp->rx_lock, flags);
			list_add_tail(&agg->list, &tp->rx_done);
			spin_unlock_irqrestore(&tp->rx_lock, flags);
			tasklet_schedule(&tp->tl);
		}
	}
}

static void tx_bottom(struct r8152 *tp)
{
	int res;

	do {
		struct tx_agg *agg;

		if (skb_queue_empty(&tp->tx_queue))
			break;

		agg = r8152_get_tx_agg(tp);
		if (!agg)
			break;

		res = r8152_tx_agg_fill(tp, agg);
		if (res) {
			struct net_device *netdev = tp->netdev;

			if (res == -ENODEV) {
				netif_device_detach(netdev);
			} else {
				struct net_device_stats *stats = &netdev->stats;
				unsigned long flags;

				netif_warn(tp, tx_err, netdev,
					   "failed tx_urb %d\n", res);
				stats->tx_dropped += agg->skb_num;

				spin_lock_irqsave(&tp->tx_lock, flags);
				list_add_tail(&agg->list, &tp->tx_free);
				spin_unlock_irqrestore(&tp->tx_lock, flags);
			}
		}
	} while (res == 0);
}

static void bottom_half(unsigned long data)
{
	struct r8152 *tp;

	tp = (struct r8152 *)data;

	if (test_bit(RTL8152_UNPLUG, &tp->flags))
		return;

	if (!test_bit(WORK_ENABLE, &tp->flags))
		return;

	/* When link down, the driver would cancel all bulks. */
	/* This avoid the re-submitting bulk */
	if (!netif_carrier_ok(tp->netdev))
		return;

	rx_bottom(tp);
	tx_bottom(tp);
}

static
int r8152_submit_rx(struct r8152 *tp, struct rx_agg *agg, gfp_t mem_flags)
{
	usb_fill_bulk_urb(agg->urb, tp->udev, usb_rcvbulkpipe(tp->udev, 1),
		      agg->head, rx_buf_sz,
		      (usb_complete_t)read_bulk_callback, agg);

	return usb_submit_urb(agg->urb, mem_flags);
}

static void rtl_drop_queued_tx(struct r8152 *tp)
{
	struct net_device_stats *stats = &tp->netdev->stats;
	struct sk_buff_head skb_head, *tx_queue = &tp->tx_queue;
	struct sk_buff *skb;

	if (skb_queue_empty(tx_queue))
		return;

	__skb_queue_head_init(&skb_head);
	spin_lock_bh(&tx_queue->lock);
	skb_queue_splice_init(tx_queue, &skb_head);
	spin_unlock_bh(&tx_queue->lock);

	while ((skb = __skb_dequeue(&skb_head))) {
		dev_kfree_skb(skb);
		stats->tx_dropped++;
	}
}

static void rtl8152_tx_timeout(struct net_device *netdev)
{
	struct r8152 *tp = netdev_priv(netdev);
	int i;

	netif_warn(tp, tx_err, netdev, "Tx timeout\n");
	for (i = 0; i < RTL8152_MAX_TX; i++)
		usb_unlink_urb(tp->tx_info[i].urb);
}

static void rtl8152_set_rx_mode(struct net_device *netdev)
{
	struct r8152 *tp = netdev_priv(netdev);

	if (tp->speed & LINK_STATUS) {
		set_bit(RTL8152_SET_RX_MODE, &tp->flags);
		schedule_delayed_work(&tp->schedule, 0);
	}
}

static void _rtl8152_set_rx_mode(struct net_device *netdev)
{
	struct r8152 *tp = netdev_priv(netdev);
	u32 mc_filter[2];	/* Multicast hash filter */
	__le32 tmp[2];
	u32 ocp_data;

	clear_bit(RTL8152_SET_RX_MODE, &tp->flags);
	netif_stop_queue(netdev);
	ocp_data = ocp_read_dword(tp, MCU_TYPE_PLA, PLA_RCR);
	ocp_data &= ~RCR_ACPT_ALL;
	ocp_data |= RCR_AB | RCR_APM;

	if (netdev->flags & IFF_PROMISC) {
		/* Unconditionally log net taps. */
		netif_notice(tp, link, netdev, "Promiscuous mode enabled\n");
		ocp_data |= RCR_AM | RCR_AAP;
		mc_filter[1] = mc_filter[0] = 0xffffffff;
	} else if ((netdev_mc_count(netdev) > multicast_filter_limit) ||
		   (netdev->flags & IFF_ALLMULTI)) {
		/* Too many to filter perfectly -- accept all multicasts. */
		ocp_data |= RCR_AM;
		mc_filter[1] = mc_filter[0] = 0xffffffff;
	} else {
		struct netdev_hw_addr *ha;

		mc_filter[1] = mc_filter[0] = 0;
		netdev_for_each_mc_addr(ha, netdev) {
			int bit_nr = ether_crc(ETH_ALEN, ha->addr) >> 26;
			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
			ocp_data |= RCR_AM;
		}
	}

	tmp[0] = __cpu_to_le32(swab32(mc_filter[1]));
	tmp[1] = __cpu_to_le32(swab32(mc_filter[0]));

	pla_ocp_write(tp, PLA_MAR, BYTE_EN_DWORD, sizeof(tmp), tmp);
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RCR, ocp_data);
	netif_wake_queue(netdev);
}

static netdev_tx_t rtl8152_start_xmit(struct sk_buff *skb,
					struct net_device *netdev)
{
	struct r8152 *tp = netdev_priv(netdev);

	skb_tx_timestamp(skb);

	skb_queue_tail(&tp->tx_queue, skb);

	if (!list_empty(&tp->tx_free)) {
		if (test_bit(SELECTIVE_SUSPEND, &tp->flags)) {
			set_bit(SCHEDULE_TASKLET, &tp->flags);
			schedule_delayed_work(&tp->schedule, 0);
		} else {
			usb_mark_last_busy(tp->udev);
			tasklet_schedule(&tp->tl);
		}
	} else if (skb_queue_len(&tp->tx_queue) > tp->tx_qlen)
		netif_stop_queue(netdev);

	return NETDEV_TX_OK;
}

static void r8152b_reset_packet_filter(struct r8152 *tp)
{
	u32	ocp_data;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_FMC);
	ocp_data &= ~FMC_FCR_MCU_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_FMC, ocp_data);
	ocp_data |= FMC_FCR_MCU_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_FMC, ocp_data);
}

static void rtl8152_nic_reset(struct r8152 *tp)
{
	int	i;

	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CR, CR_RST);

	for (i = 0; i < 1000; i++) {
		if (!(ocp_read_byte(tp, MCU_TYPE_PLA, PLA_CR) & CR_RST))
			break;
		udelay(100);
	}
}

static void set_tx_qlen(struct r8152 *tp)
{
	struct net_device *netdev = tp->netdev;

	tp->tx_qlen = rx_buf_sz / (netdev->mtu + VLAN_ETH_HLEN + VLAN_HLEN +
				   sizeof(struct tx_desc));
}

static inline u8 rtl8152_get_speed(struct r8152 *tp)
{
	return ocp_read_byte(tp, MCU_TYPE_PLA, PLA_PHYSTATUS);
}

static void rtl_set_eee_plus(struct r8152 *tp)
{
	u32 ocp_data;
	u8 speed;

	speed = rtl8152_get_speed(tp);
	if (speed & _10bps) {
		ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_EEEP_CR);
		ocp_data |= EEEP_CR_EEEP_TX;
		ocp_write_word(tp, MCU_TYPE_PLA, PLA_EEEP_CR, ocp_data);
	} else {
		ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_EEEP_CR);
		ocp_data &= ~EEEP_CR_EEEP_TX;
		ocp_write_word(tp, MCU_TYPE_PLA, PLA_EEEP_CR, ocp_data);
	}
}

static void rxdy_gated_en(struct r8152 *tp, bool enable)
{
	u32 ocp_data;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_MISC_1);
	if (enable)
		ocp_data |= RXDY_GATED_EN;
	else
		ocp_data &= ~RXDY_GATED_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_MISC_1, ocp_data);
}

static int rtl_enable(struct r8152 *tp)
{
	u32 ocp_data;
	int i, ret;

	r8152b_reset_packet_filter(tp);

	ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_CR);
	ocp_data |= CR_RE | CR_TE;
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CR, ocp_data);

	rxdy_gated_en(tp, false);

	INIT_LIST_HEAD(&tp->rx_done);
	ret = 0;
	for (i = 0; i < RTL8152_MAX_RX; i++) {
		INIT_LIST_HEAD(&tp->rx_info[i].list);
		ret |= r8152_submit_rx(tp, &tp->rx_info[i], GFP_KERNEL);
	}

	return ret;
}

static int rtl8152_enable(struct r8152 *tp)
{
	set_tx_qlen(tp);
	rtl_set_eee_plus(tp);

	return rtl_enable(tp);
}

static void r8153_set_rx_agg(struct r8152 *tp)
{
	u8 speed;

	speed = rtl8152_get_speed(tp);
	if (speed & _1000bps) {
		if (tp->udev->speed == USB_SPEED_SUPER) {
			ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_BUF_TH,
					RX_THR_SUPPER);
			ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_EARLY_AGG,
					EARLY_AGG_SUPPER);
		} else {
			ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_BUF_TH,
					RX_THR_HIGH);
			ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_EARLY_AGG,
					EARLY_AGG_HIGH);
		}
	} else {
		ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_BUF_TH, RX_THR_SLOW);
		ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_EARLY_AGG,
				EARLY_AGG_SLOW);
	}
}

static int rtl8153_enable(struct r8152 *tp)
{
	set_tx_qlen(tp);
	rtl_set_eee_plus(tp);
	r8153_set_rx_agg(tp);

	return rtl_enable(tp);
}

static void rtl8152_disable(struct r8152 *tp)
{
	u32 ocp_data;
	int i;

	ocp_data = ocp_read_dword(tp, MCU_TYPE_PLA, PLA_RCR);
	ocp_data &= ~RCR_ACPT_ALL;
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RCR, ocp_data);

	rtl_drop_queued_tx(tp);

	for (i = 0; i < RTL8152_MAX_TX; i++)
		usb_kill_urb(tp->tx_info[i].urb);

	rxdy_gated_en(tp, true);

	for (i = 0; i < 1000; i++) {
		ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
		if ((ocp_data & FIFO_EMPTY) == FIFO_EMPTY)
			break;
		mdelay(1);
	}

	for (i = 0; i < 1000; i++) {
		if (ocp_read_word(tp, MCU_TYPE_PLA, PLA_TCR0) & TCR0_TX_EMPTY)
			break;
		mdelay(1);
	}

	for (i = 0; i < RTL8152_MAX_RX; i++)
		usb_kill_urb(tp->rx_info[i].urb);

	rtl8152_nic_reset(tp);
}

static void r8152_power_cut_en(struct r8152 *tp, bool enable)
{
	u32 ocp_data;

	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_UPS_CTRL);
	if (enable)
		ocp_data |= POWER_CUT;
	else
		ocp_data &= ~POWER_CUT;
	ocp_write_word(tp, MCU_TYPE_USB, USB_UPS_CTRL, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_PM_CTRL_STATUS);
	ocp_data &= ~RESUME_INDICATE;
	ocp_write_word(tp, MCU_TYPE_USB, USB_PM_CTRL_STATUS, ocp_data);
}

#define WAKE_ANY (WAKE_PHY | WAKE_MAGIC | WAKE_UCAST | WAKE_BCAST | WAKE_MCAST)

static u32 __rtl_get_wol(struct r8152 *tp)
{
	u32 ocp_data;
	u32 wolopts = 0;

	ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_CONFIG5);
	if (!(ocp_data & LAN_WAKE_EN))
		return 0;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CONFIG34);
	if (ocp_data & LINK_ON_WAKE_EN)
		wolopts |= WAKE_PHY;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CONFIG5);
	if (ocp_data & UWF_EN)
		wolopts |= WAKE_UCAST;
	if (ocp_data & BWF_EN)
		wolopts |= WAKE_BCAST;
	if (ocp_data & MWF_EN)
		wolopts |= WAKE_MCAST;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CFG_WOL);
	if (ocp_data & MAGIC_EN)
		wolopts |= WAKE_MAGIC;

	return wolopts;
}

static void __rtl_set_wol(struct r8152 *tp, u32 wolopts)
{
	u32 ocp_data;

	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CRWECR, CRWECR_CONFIG);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CONFIG34);
	ocp_data &= ~LINK_ON_WAKE_EN;
	if (wolopts & WAKE_PHY)
		ocp_data |= LINK_ON_WAKE_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_CONFIG34, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CONFIG5);
	ocp_data &= ~(UWF_EN | BWF_EN | MWF_EN | LAN_WAKE_EN);
	if (wolopts & WAKE_UCAST)
		ocp_data |= UWF_EN;
	if (wolopts & WAKE_BCAST)
		ocp_data |= BWF_EN;
	if (wolopts & WAKE_MCAST)
		ocp_data |= MWF_EN;
	if (wolopts & WAKE_ANY)
		ocp_data |= LAN_WAKE_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_CONFIG5, ocp_data);

	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CRWECR, CRWECR_NORAML);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CFG_WOL);
	ocp_data &= ~MAGIC_EN;
	if (wolopts & WAKE_MAGIC)
		ocp_data |= MAGIC_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_CFG_WOL, ocp_data);

	if (wolopts & WAKE_ANY)
		device_set_wakeup_enable(&tp->udev->dev, true);
	else
		device_set_wakeup_enable(&tp->udev->dev, false);
}

static void rtl_runtime_suspend_enable(struct r8152 *tp, bool enable)
{
	if (enable) {
		u32 ocp_data;

		__rtl_set_wol(tp, WAKE_ANY);

		ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CRWECR, CRWECR_CONFIG);

		ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CONFIG34);
		ocp_data |= LINK_OFF_WAKE_EN;
		ocp_write_word(tp, MCU_TYPE_PLA, PLA_CONFIG34, ocp_data);

		ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CRWECR, CRWECR_NORAML);
	} else {
		__rtl_set_wol(tp, tp->saved_wolopts);
	}
}

static void rtl_phy_reset(struct r8152 *tp)
{
	u16 data;
	int i;

	clear_bit(PHY_RESET, &tp->flags);

	data = r8152_mdio_read(tp, MII_BMCR);

	/* don't reset again before the previous one complete */
	if (data & BMCR_RESET)
		return;

	data |= BMCR_RESET;
	r8152_mdio_write(tp, MII_BMCR, data);

	for (i = 0; i < 50; i++) {
		msleep(20);
		if ((r8152_mdio_read(tp, MII_BMCR) & BMCR_RESET) == 0)
			break;
	}
}

static void rtl_clear_bp(struct r8152 *tp)
{
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_BP_0, 0);
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_BP_2, 0);
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_BP_4, 0);
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_BP_6, 0);
	ocp_write_dword(tp, MCU_TYPE_USB, USB_BP_0, 0);
	ocp_write_dword(tp, MCU_TYPE_USB, USB_BP_2, 0);
	ocp_write_dword(tp, MCU_TYPE_USB, USB_BP_4, 0);
	ocp_write_dword(tp, MCU_TYPE_USB, USB_BP_6, 0);
	mdelay(3);
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_BP_BA, 0);
	ocp_write_word(tp, MCU_TYPE_USB, USB_BP_BA, 0);
}

static void r8153_clear_bp(struct r8152 *tp)
{
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_BP_EN, 0);
	ocp_write_byte(tp, MCU_TYPE_USB, USB_BP_EN, 0);
	rtl_clear_bp(tp);
}

static void r8153_teredo_off(struct r8152 *tp)
{
	u32 ocp_data;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_TEREDO_CFG);
	ocp_data &= ~(TEREDO_SEL | TEREDO_RS_EVENT_MASK | OOB_TEREDO_EN);
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_TEREDO_CFG, ocp_data);

	ocp_write_word(tp, MCU_TYPE_PLA, PLA_WDT6_CTRL, WDT6_SET_MODE);
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_REALWOW_TIMER, 0);
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_TEREDO_TIMER, 0);
}

static void r8152b_disable_aldps(struct r8152 *tp)
{
	ocp_reg_write(tp, OCP_ALDPS_CONFIG, ENPDNPS | LINKENA | DIS_SDSAVE);
	msleep(20);
}

static inline void r8152b_enable_aldps(struct r8152 *tp)
{
	ocp_reg_write(tp, OCP_ALDPS_CONFIG, ENPWRSAVE | ENPDNPS |
					    LINKENA | DIS_SDSAVE);
}

static void r8152b_hw_phy_cfg(struct r8152 *tp)
{
	u16 data;

	data = r8152_mdio_read(tp, MII_BMCR);
	if (data & BMCR_PDOWN) {
		data &= ~BMCR_PDOWN;
		r8152_mdio_write(tp, MII_BMCR, data);
	}

	r8152b_disable_aldps(tp);

	rtl_clear_bp(tp);

	r8152b_enable_aldps(tp);
	set_bit(PHY_RESET, &tp->flags);
}

static void r8152b_exit_oob(struct r8152 *tp)
{
	u32 ocp_data;
	int i;

	ocp_data = ocp_read_dword(tp, MCU_TYPE_PLA, PLA_RCR);
	ocp_data &= ~RCR_ACPT_ALL;
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RCR, ocp_data);

	rxdy_gated_en(tp, true);
	r8153_teredo_off(tp);
	r8152b_hw_phy_cfg(tp);

	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CRWECR, CRWECR_NORAML);
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_CR, 0x00);

	ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
	ocp_data &= ~NOW_IS_OOB;
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7);
	ocp_data &= ~MCU_BORW_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7, ocp_data);

	for (i = 0; i < 1000; i++) {
		ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
		if (ocp_data & LINK_LIST_READY)
			break;
		mdelay(1);
	}

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7);
	ocp_data |= RE_INIT_LL;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7, ocp_data);

	for (i = 0; i < 1000; i++) {
		ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
		if (ocp_data & LINK_LIST_READY)
			break;
		mdelay(1);
	}

	rtl8152_nic_reset(tp);

	/* rx share fifo credit full threshold */
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL0, RXFIFO_THR1_NORMAL);

	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_DEV_STAT);
	ocp_data &= STAT_SPEED_MASK;
	if (ocp_data == STAT_SPEED_FULL) {
		/* rx share fifo credit near full threshold */
		ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL1,
				RXFIFO_THR2_FULL);
		ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL2,
				RXFIFO_THR3_FULL);
	} else {
		/* rx share fifo credit near full threshold */
		ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL1,
				RXFIFO_THR2_HIGH);
		ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL2,
				RXFIFO_THR3_HIGH);
	}

	/* TX share fifo free credit full threshold */
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_TXFIFO_CTRL, TXFIFO_THR_NORMAL);

	ocp_write_byte(tp, MCU_TYPE_USB, USB_TX_AGG, TX_AGG_MAX_THRESHOLD);
	ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_BUF_TH, RX_THR_HIGH);
	ocp_write_dword(tp, MCU_TYPE_USB, USB_TX_DMA,
			TEST_MODE_DISABLE | TX_SIZE_ADJUST1);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CPCR);
	ocp_data &= ~CPCR_RX_VLAN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_CPCR, ocp_data);

	ocp_write_word(tp, MCU_TYPE_PLA, PLA_RMS, RTL8152_RMS);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_TCR0);
	ocp_data |= TCR0_AUTO_FIFO;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_TCR0, ocp_data);
}

static void r8152b_enter_oob(struct r8152 *tp)
{
	u32 ocp_data;
	int i;

	ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
	ocp_data &= ~NOW_IS_OOB;
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL, ocp_data);

	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL0, RXFIFO_THR1_OOB);
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL1, RXFIFO_THR2_OOB);
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL2, RXFIFO_THR3_OOB);

	rtl8152_disable(tp);

	for (i = 0; i < 1000; i++) {
		ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
		if (ocp_data & LINK_LIST_READY)
			break;
		mdelay(1);
	}

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7);
	ocp_data |= RE_INIT_LL;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7, ocp_data);

	for (i = 0; i < 1000; i++) {
		ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
		if (ocp_data & LINK_LIST_READY)
			break;
		mdelay(1);
	}

	ocp_write_word(tp, MCU_TYPE_PLA, PLA_RMS, RTL8152_RMS);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CPCR);
	ocp_data |= CPCR_RX_VLAN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_CPCR, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PAL_BDC_CR);
	ocp_data |= ALDPS_PROXY_MODE;
	ocp_write_word(tp, MCU_TYPE_PLA, PAL_BDC_CR, ocp_data);

	ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
	ocp_data |= NOW_IS_OOB | DIS_MCU_CLROOB;
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL, ocp_data);

	rxdy_gated_en(tp, false);

	ocp_data = ocp_read_dword(tp, MCU_TYPE_PLA, PLA_RCR);
	ocp_data |= RCR_APM | RCR_AM | RCR_AB;
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RCR, ocp_data);
}

static void r8153_hw_phy_cfg(struct r8152 *tp)
{
	u32 ocp_data;
	u16 data;

	ocp_reg_write(tp, OCP_ADC_CFG, CKADSEL_L | ADC_EN | EN_EMI_L);
	data = r8152_mdio_read(tp, MII_BMCR);
	if (data & BMCR_PDOWN) {
		data &= ~BMCR_PDOWN;
		r8152_mdio_write(tp, MII_BMCR, data);
	}

	r8153_clear_bp(tp);

	if (tp->version == RTL_VER_03) {
		data = ocp_reg_read(tp, OCP_EEE_CFG);
		data &= ~CTAP_SHORT_EN;
		ocp_reg_write(tp, OCP_EEE_CFG, data);
	}

	data = ocp_reg_read(tp, OCP_POWER_CFG);
	data |= EEE_CLKDIV_EN;
	ocp_reg_write(tp, OCP_POWER_CFG, data);

	data = ocp_reg_read(tp, OCP_DOWN_SPEED);
	data |= EN_10M_BGOFF;
	ocp_reg_write(tp, OCP_DOWN_SPEED, data);
	data = ocp_reg_read(tp, OCP_POWER_CFG);
	data |= EN_10M_PLLOFF;
	ocp_reg_write(tp, OCP_POWER_CFG, data);
	data = sram_read(tp, SRAM_IMPEDANCE);
	data &= ~RX_DRIVING_MASK;
	sram_write(tp, SRAM_IMPEDANCE, data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_PHY_PWR);
	ocp_data |= PFM_PWM_SWITCH;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_PHY_PWR, ocp_data);

	data = sram_read(tp, SRAM_LPF_CFG);
	data |= LPF_AUTO_TUNE;
	sram_write(tp, SRAM_LPF_CFG, data);

	data = sram_read(tp, SRAM_10M_AMP1);
	data |= GDAC_IB_UPALL;
	sram_write(tp, SRAM_10M_AMP1, data);
	data = sram_read(tp, SRAM_10M_AMP2);
	data |= AMP_DN;
	sram_write(tp, SRAM_10M_AMP2, data);

	set_bit(PHY_RESET, &tp->flags);
}

static void r8153_u1u2en(struct r8152 *tp, bool enable)
{
	u8 u1u2[8];

	if (enable)
		memset(u1u2, 0xff, sizeof(u1u2));
	else
		memset(u1u2, 0x00, sizeof(u1u2));

	usb_ocp_write(tp, USB_TOLERANCE, BYTE_EN_SIX_BYTES, sizeof(u1u2), u1u2);
}

static void r8153_u2p3en(struct r8152 *tp, bool enable)
{
	u32 ocp_data;

	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_U2P3_CTRL);
	if (enable)
		ocp_data |= U2P3_ENABLE;
	else
		ocp_data &= ~U2P3_ENABLE;
	ocp_write_word(tp, MCU_TYPE_USB, USB_U2P3_CTRL, ocp_data);
}

static void r8153_power_cut_en(struct r8152 *tp, bool enable)
{
	u32 ocp_data;

	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_POWER_CUT);
	if (enable)
		ocp_data |= PWR_EN | PHASE2_EN;
	else
		ocp_data &= ~(PWR_EN | PHASE2_EN);
	ocp_write_word(tp, MCU_TYPE_USB, USB_POWER_CUT, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_MISC_0);
	ocp_data &= ~PCUT_STATUS;
	ocp_write_word(tp, MCU_TYPE_USB, USB_MISC_0, ocp_data);
}

static void r8153_first_init(struct r8152 *tp)
{
	u32 ocp_data;
	int i;

	rxdy_gated_en(tp, true);
	r8153_teredo_off(tp);

	ocp_data = ocp_read_dword(tp, MCU_TYPE_PLA, PLA_RCR);
	ocp_data &= ~RCR_ACPT_ALL;
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RCR, ocp_data);

	r8153_hw_phy_cfg(tp);

	rtl8152_nic_reset(tp);

	ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
	ocp_data &= ~NOW_IS_OOB;
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7);
	ocp_data &= ~MCU_BORW_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7, ocp_data);

	for (i = 0; i < 1000; i++) {
		ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
		if (ocp_data & LINK_LIST_READY)
			break;
		mdelay(1);
	}

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7);
	ocp_data |= RE_INIT_LL;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7, ocp_data);

	for (i = 0; i < 1000; i++) {
		ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
		if (ocp_data & LINK_LIST_READY)
			break;
		mdelay(1);
	}

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CPCR);
	ocp_data &= ~CPCR_RX_VLAN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_CPCR, ocp_data);

	ocp_write_word(tp, MCU_TYPE_PLA, PLA_RMS, RTL8152_RMS);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_TCR0);
	ocp_data |= TCR0_AUTO_FIFO;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_TCR0, ocp_data);

	rtl8152_nic_reset(tp);

	/* rx share fifo credit full threshold */
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL0, RXFIFO_THR1_NORMAL);
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL1, RXFIFO_THR2_NORMAL);
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_RXFIFO_CTRL2, RXFIFO_THR3_NORMAL);
	/* TX share fifo free credit full threshold */
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_TXFIFO_CTRL, TXFIFO_THR_NORMAL2);

	/* rx aggregation */
	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_USB_CTRL);
	ocp_data &= ~RX_AGG_DISABLE;
	ocp_write_word(tp, MCU_TYPE_USB, USB_USB_CTRL, ocp_data);
}

static void r8153_enter_oob(struct r8152 *tp)
{
	u32 ocp_data;
	int i;

	ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
	ocp_data &= ~NOW_IS_OOB;
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL, ocp_data);

	rtl8152_disable(tp);

	for (i = 0; i < 1000; i++) {
		ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
		if (ocp_data & LINK_LIST_READY)
			break;
		mdelay(1);
	}

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7);
	ocp_data |= RE_INIT_LL;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_SFF_STS_7, ocp_data);

	for (i = 0; i < 1000; i++) {
		ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
		if (ocp_data & LINK_LIST_READY)
			break;
		mdelay(1);
	}

	ocp_write_word(tp, MCU_TYPE_PLA, PLA_RMS, RTL8152_RMS);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_TEREDO_CFG);
	ocp_data &= ~TEREDO_WAKE_MASK;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_TEREDO_CFG, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_CPCR);
	ocp_data |= CPCR_RX_VLAN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_CPCR, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PAL_BDC_CR);
	ocp_data |= ALDPS_PROXY_MODE;
	ocp_write_word(tp, MCU_TYPE_PLA, PAL_BDC_CR, ocp_data);

	ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL);
	ocp_data |= NOW_IS_OOB | DIS_MCU_CLROOB;
	ocp_write_byte(tp, MCU_TYPE_PLA, PLA_OOB_CTRL, ocp_data);

	rxdy_gated_en(tp, false);

	ocp_data = ocp_read_dword(tp, MCU_TYPE_PLA, PLA_RCR);
	ocp_data |= RCR_APM | RCR_AM | RCR_AB;
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_RCR, ocp_data);
}

static void r8153_disable_aldps(struct r8152 *tp)
{
	u16 data;

	data = ocp_reg_read(tp, OCP_POWER_CFG);
	data &= ~EN_ALDPS;
	ocp_reg_write(tp, OCP_POWER_CFG, data);
	msleep(20);
}

static void r8153_enable_aldps(struct r8152 *tp)
{
	u16 data;

	data = ocp_reg_read(tp, OCP_POWER_CFG);
	data |= EN_ALDPS;
	ocp_reg_write(tp, OCP_POWER_CFG, data);
}

static int rtl8152_set_speed(struct r8152 *tp, u8 autoneg, u16 speed, u8 duplex)
{
	u16 bmcr, anar, gbcr;
	int ret = 0;

	cancel_delayed_work_sync(&tp->schedule);
	anar = r8152_mdio_read(tp, MII_ADVERTISE);
	anar &= ~(ADVERTISE_10HALF | ADVERTISE_10FULL |
		  ADVERTISE_100HALF | ADVERTISE_100FULL);
	if (tp->mii.supports_gmii) {
		gbcr = r8152_mdio_read(tp, MII_CTRL1000);
		gbcr &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
	} else {
		gbcr = 0;
	}

	if (autoneg == AUTONEG_DISABLE) {
		if (speed == SPEED_10) {
			bmcr = 0;
			anar |= ADVERTISE_10HALF | ADVERTISE_10FULL;
		} else if (speed == SPEED_100) {
			bmcr = BMCR_SPEED100;
			anar |= ADVERTISE_100HALF | ADVERTISE_100FULL;
		} else if (speed == SPEED_1000 && tp->mii.supports_gmii) {
			bmcr = BMCR_SPEED1000;
			gbcr |= ADVERTISE_1000FULL | ADVERTISE_1000HALF;
		} else {
			ret = -EINVAL;
			goto out;
		}

		if (duplex == DUPLEX_FULL)
			bmcr |= BMCR_FULLDPLX;
	} else {
		if (speed == SPEED_10) {
			if (duplex == DUPLEX_FULL)
				anar |= ADVERTISE_10HALF | ADVERTISE_10FULL;
			else
				anar |= ADVERTISE_10HALF;
		} else if (speed == SPEED_100) {
			if (duplex == DUPLEX_FULL) {
				anar |= ADVERTISE_10HALF | ADVERTISE_10FULL;
				anar |= ADVERTISE_100HALF | ADVERTISE_100FULL;
			} else {
				anar |= ADVERTISE_10HALF;
				anar |= ADVERTISE_100HALF;
			}
		} else if (speed == SPEED_1000 && tp->mii.supports_gmii) {
			if (duplex == DUPLEX_FULL) {
				anar |= ADVERTISE_10HALF | ADVERTISE_10FULL;
				anar |= ADVERTISE_100HALF | ADVERTISE_100FULL;
				gbcr |= ADVERTISE_1000FULL | ADVERTISE_1000HALF;
			} else {
				anar |= ADVERTISE_10HALF;
				anar |= ADVERTISE_100HALF;
				gbcr |= ADVERTISE_1000HALF;
			}
		} else {
			ret = -EINVAL;
			goto out;
		}

		bmcr = BMCR_ANENABLE | BMCR_ANRESTART;
	}

	if (test_bit(PHY_RESET, &tp->flags))
		bmcr |= BMCR_RESET;

	if (tp->mii.supports_gmii)
		r8152_mdio_write(tp, MII_CTRL1000, gbcr);

	r8152_mdio_write(tp, MII_ADVERTISE, anar);
	r8152_mdio_write(tp, MII_BMCR, bmcr);

	if (test_bit(PHY_RESET, &tp->flags)) {
		int i;

		clear_bit(PHY_RESET, &tp->flags);
		for (i = 0; i < 50; i++) {
			msleep(20);
			if ((r8152_mdio_read(tp, MII_BMCR) & BMCR_RESET) == 0)
				break;
		}
	}

out:

	return ret;
}

static void rtl8152_down(struct r8152 *tp)
{
	r8152_power_cut_en(tp, false);
	r8152b_disable_aldps(tp);
	r8152b_enter_oob(tp);
	r8152b_enable_aldps(tp);
}

static void rtl8153_down(struct r8152 *tp)
{
	r8153_u1u2en(tp, false);
	r8153_power_cut_en(tp, false);
	r8153_disable_aldps(tp);
	r8153_enter_oob(tp);
	r8153_enable_aldps(tp);
}

static void set_carrier(struct r8152 *tp)
{
	struct net_device *netdev = tp->netdev;
	u8 speed;

	clear_bit(RTL8152_LINK_CHG, &tp->flags);
	speed = rtl8152_get_speed(tp);

	if (speed & LINK_STATUS) {
		if (!(tp->speed & LINK_STATUS)) {
			tp->rtl_ops.enable(tp);
			set_bit(RTL8152_SET_RX_MODE, &tp->flags);
			netif_carrier_on(netdev);
		}
	} else {
		if (tp->speed & LINK_STATUS) {
			netif_carrier_off(netdev);
			tasklet_disable(&tp->tl);
			tp->rtl_ops.disable(tp);
			tasklet_enable(&tp->tl);
		}
	}
	tp->speed = speed;
}

static void rtl_work_func_t(struct work_struct *work)
{
	struct r8152 *tp = container_of(work, struct r8152, schedule.work);

	if (usb_autopm_get_interface(tp->intf) < 0)
		return;

	if (!test_bit(WORK_ENABLE, &tp->flags))
		goto out1;

	if (test_bit(RTL8152_UNPLUG, &tp->flags))
		goto out1;

	if (test_bit(RTL8152_LINK_CHG, &tp->flags))
		set_carrier(tp);

	if (test_bit(RTL8152_SET_RX_MODE, &tp->flags))
		_rtl8152_set_rx_mode(tp->netdev);

	if (test_bit(SCHEDULE_TASKLET, &tp->flags) &&
	    (tp->speed & LINK_STATUS)) {
		clear_bit(SCHEDULE_TASKLET, &tp->flags);
		tasklet_schedule(&tp->tl);
	}

	if (test_bit(PHY_RESET, &tp->flags))
		rtl_phy_reset(tp);

out1:
	usb_autopm_put_interface(tp->intf);
}

static int rtl8152_open(struct net_device *netdev)
{
	struct r8152 *tp = netdev_priv(netdev);
	int res = 0;

	res = alloc_all_mem(tp);
	if (res)
		goto out;

	res = usb_autopm_get_interface(tp->intf);
	if (res < 0) {
		free_all_mem(tp);
		goto out;
	}

	/* The WORK_ENABLE may be set when autoresume occurs */
	if (test_bit(WORK_ENABLE, &tp->flags)) {
		clear_bit(WORK_ENABLE, &tp->flags);
		usb_kill_urb(tp->intr_urb);
		cancel_delayed_work_sync(&tp->schedule);
		if (tp->speed & LINK_STATUS)
			tp->rtl_ops.disable(tp);
	}

	tp->rtl_ops.up(tp);

	rtl8152_set_speed(tp, AUTONEG_ENABLE,
			  tp->mii.supports_gmii ? SPEED_1000 : SPEED_100,
			  DUPLEX_FULL);
	tp->speed = 0;
	netif_carrier_off(netdev);
	netif_start_queue(netdev);
	set_bit(WORK_ENABLE, &tp->flags);

	res = usb_submit_urb(tp->intr_urb, GFP_KERNEL);
	if (res) {
		if (res == -ENODEV)
			netif_device_detach(tp->netdev);
		netif_warn(tp, ifup, netdev, "intr_urb submit failed: %d\n",
			   res);
		free_all_mem(tp);
	}

	usb_autopm_put_interface(tp->intf);

out:
	return res;
}

static int rtl8152_close(struct net_device *netdev)
{
	struct r8152 *tp = netdev_priv(netdev);
	int res = 0;

	clear_bit(WORK_ENABLE, &tp->flags);
	usb_kill_urb(tp->intr_urb);
	cancel_delayed_work_sync(&tp->schedule);
	netif_stop_queue(netdev);

	res = usb_autopm_get_interface(tp->intf);
	if (res < 0) {
		rtl_drop_queued_tx(tp);
	} else {
		/*
		 * The autosuspend may have been enabled and wouldn't
		 * be disable when autoresume occurs, because the
		 * netif_running() would be false.
		 */
		if (test_bit(SELECTIVE_SUSPEND, &tp->flags)) {
			rtl_runtime_suspend_enable(tp, false);
			clear_bit(SELECTIVE_SUSPEND, &tp->flags);
		}

		tasklet_disable(&tp->tl);
		tp->rtl_ops.down(tp);
		tasklet_enable(&tp->tl);
		usb_autopm_put_interface(tp->intf);
	}

	free_all_mem(tp);

	return res;
}

static void r8152b_enable_eee(struct r8152 *tp)
{
	u32 ocp_data;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_EEE_CR);
	ocp_data |= EEE_RX_EN | EEE_TX_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_EEE_CR, ocp_data);
	ocp_reg_write(tp, OCP_EEE_CONFIG1, RG_TXLPI_MSK_HFDUP | RG_MATCLR_EN |
					   EEE_10_CAP | EEE_NWAY_EN |
					   TX_QUIET_EN | RX_QUIET_EN |
					   SDRISETIME | RG_RXLPI_MSK_HFDUP |
					   SDFALLTIME);
	ocp_reg_write(tp, OCP_EEE_CONFIG2, RG_LPIHYS_NUM | RG_DACQUIET_EN |
					   RG_LDVQUIET_EN | RG_CKRSEL |
					   RG_EEEPRG_EN);
	ocp_reg_write(tp, OCP_EEE_CONFIG3, FST_SNR_EYE_R | RG_LFS_SEL | MSK_PH);
	ocp_reg_write(tp, OCP_EEE_AR, FUN_ADDR | DEVICE_ADDR);
	ocp_reg_write(tp, OCP_EEE_DATA, EEE_ADDR);
	ocp_reg_write(tp, OCP_EEE_AR, FUN_DATA | DEVICE_ADDR);
	ocp_reg_write(tp, OCP_EEE_DATA, EEE_DATA);
	ocp_reg_write(tp, OCP_EEE_AR, 0x0000);
}

static void r8153_enable_eee(struct r8152 *tp)
{
	u32 ocp_data;
	u16 data;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_EEE_CR);
	ocp_data |= EEE_RX_EN | EEE_TX_EN;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_EEE_CR, ocp_data);
	data = ocp_reg_read(tp, OCP_EEE_CFG);
	data |= EEE10_EN;
	ocp_reg_write(tp, OCP_EEE_CFG, data);
	data = ocp_reg_read(tp, OCP_EEE_CFG2);
	data |= MY1000_EEE | MY100_EEE;
	ocp_reg_write(tp, OCP_EEE_CFG2, data);
}

static void r8152b_enable_fc(struct r8152 *tp)
{
	u16 anar;

	anar = r8152_mdio_read(tp, MII_ADVERTISE);
	anar |= ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;
	r8152_mdio_write(tp, MII_ADVERTISE, anar);
}

static void rtl_tally_reset(struct r8152 *tp)
{
	u32 ocp_data;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_RSTTALLY);
	ocp_data |= TALLY_RESET;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_RSTTALLY, ocp_data);
}

static void r8152b_init(struct r8152 *tp)
{
	u32 ocp_data;

	if (tp->version == RTL_VER_01) {
		ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_LED_FEATURE);
		ocp_data &= ~LED_MODE_MASK;
		ocp_write_word(tp, MCU_TYPE_PLA, PLA_LED_FEATURE, ocp_data);
	}

	r8152_power_cut_en(tp, false);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_PHY_PWR);
	ocp_data |= TX_10M_IDLE_EN | PFM_PWM_SWITCH;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_PHY_PWR, ocp_data);
	ocp_data = ocp_read_dword(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL);
	ocp_data &= ~MCU_CLK_RATIO_MASK;
	ocp_data |= MCU_CLK_RATIO | D3_CLK_GATED_EN;
	ocp_write_dword(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL, ocp_data);
	ocp_data = GPHY_STS_MSK | SPEED_DOWN_MSK |
		   SPDWN_RXDV_MSK | SPDWN_LINKCHG_MSK;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_GPHY_INTR_IMR, ocp_data);

	r8152b_enable_eee(tp);
	r8152b_enable_aldps(tp);
	r8152b_enable_fc(tp);
	rtl_tally_reset(tp);

	/* enable rx aggregation */
	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_USB_CTRL);
	ocp_data &= ~RX_AGG_DISABLE;
	ocp_write_word(tp, MCU_TYPE_USB, USB_USB_CTRL, ocp_data);
}

static void r8153_init(struct r8152 *tp)
{
	u32 ocp_data;
	int i;

	r8153_u1u2en(tp, false);

	for (i = 0; i < 500; i++) {
		if (ocp_read_word(tp, MCU_TYPE_PLA, PLA_BOOT_CTRL) &
		    AUTOLOAD_DONE)
			break;
		msleep(20);
	}

	for (i = 0; i < 500; i++) {
		ocp_data = ocp_reg_read(tp, OCP_PHY_STATUS) & PHY_STAT_MASK;
		if (ocp_data == PHY_STAT_LAN_ON || ocp_data == PHY_STAT_PWRDN)
			break;
		msleep(20);
	}

	r8153_u2p3en(tp, false);

	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_WDT11_CTRL);
	ocp_data &= ~TIMER11_EN;
	ocp_write_word(tp, MCU_TYPE_USB, USB_WDT11_CTRL, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_LED_FEATURE);
	ocp_data &= ~LED_MODE_MASK;
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_LED_FEATURE, ocp_data);

	ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_LPM_CTRL);
	ocp_data &= ~LPM_TIMER_MASK;
	if (tp->udev->speed == USB_SPEED_SUPER)
		ocp_data |= LPM_TIMER_500US;
	else
		ocp_data |= LPM_TIMER_500MS;
	ocp_write_byte(tp, MCU_TYPE_USB, USB_LPM_CTRL, ocp_data);

	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_AFE_CTRL2);
	ocp_data &= ~SEN_VAL_MASK;
	ocp_data |= SEN_VAL_NORMAL | SEL_RXIDLE;
	ocp_write_word(tp, MCU_TYPE_USB, USB_AFE_CTRL2, ocp_data);

	r8153_power_cut_en(tp, false);
	r8153_u1u2en(tp, true);

	ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL, ALDPS_SPDWN_RATIO);
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL2, EEE_SPDWN_RATIO);
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL3,
		       PKT_AVAIL_SPDWN_EN | SUSPEND_SPDWN_EN |
		       U1U2_SPDWN_EN | L1_SPDWN_EN);
	ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL4,
		       PWRSAVE_SPDWN_EN | RXDV_SPDWN_EN | TX10MIDLE_EN |
		       TP100_SPDWN_EN | TP500_SPDWN_EN | TP1000_SPDWN_EN |
		       EEE_SPDWN_EN);

	r8153_enable_eee(tp);
	r8153_enable_aldps(tp);
	r8152b_enable_fc(tp);
	rtl_tally_reset(tp);
}

static int rtl8152_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct r8152 *tp = usb_get_intfdata(intf);

	if (PMSG_IS_AUTO(message))
		set_bit(SELECTIVE_SUSPEND, &tp->flags);
	else
		netif_device_detach(tp->netdev);

	if (netif_running(tp->netdev)) {
		clear_bit(WORK_ENABLE, &tp->flags);
		usb_kill_urb(tp->intr_urb);
		cancel_delayed_work_sync(&tp->schedule);
		if (test_bit(SELECTIVE_SUSPEND, &tp->flags)) {
			rtl_runtime_suspend_enable(tp, true);
		} else {
			tasklet_disable(&tp->tl);
			tp->rtl_ops.down(tp);
			tasklet_enable(&tp->tl);
		}
	}

	return 0;
}

static int rtl8152_resume(struct usb_interface *intf)
{
	struct r8152 *tp = usb_get_intfdata(intf);

	if (!test_bit(SELECTIVE_SUSPEND, &tp->flags)) {
		tp->rtl_ops.init(tp);
		netif_device_attach(tp->netdev);
	}

	if (netif_running(tp->netdev)) {
		if (test_bit(SELECTIVE_SUSPEND, &tp->flags)) {
			rtl_runtime_suspend_enable(tp, false);
			clear_bit(SELECTIVE_SUSPEND, &tp->flags);
			if (tp->speed & LINK_STATUS)
				tp->rtl_ops.disable(tp);
		} else {
			tp->rtl_ops.up(tp);
			rtl8152_set_speed(tp, AUTONEG_ENABLE,
				tp->mii.supports_gmii ? SPEED_1000 : SPEED_100,
				DUPLEX_FULL);
		}
		tp->speed = 0;
		netif_carrier_off(tp->netdev);
		set_bit(WORK_ENABLE, &tp->flags);
		usb_submit_urb(tp->intr_urb, GFP_KERNEL);
	}

	return 0;
}

static void rtl8152_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
	struct r8152 *tp = netdev_priv(dev);

	if (usb_autopm_get_interface(tp->intf) < 0)
		return;

	wol->supported = WAKE_ANY;
	wol->wolopts = __rtl_get_wol(tp);

	usb_autopm_put_interface(tp->intf);
}

static int rtl8152_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
	struct r8152 *tp = netdev_priv(dev);
	int ret;

	ret = usb_autopm_get_interface(tp->intf);
	if (ret < 0)
		goto out_set_wol;

	__rtl_set_wol(tp, wol->wolopts);
	tp->saved_wolopts = wol->wolopts & WAKE_ANY;

	usb_autopm_put_interface(tp->intf);

out_set_wol:
	return ret;
}

static u32 rtl8152_get_msglevel(struct net_device *dev)
{
	struct r8152 *tp = netdev_priv(dev);

	return tp->msg_enable;
}

static void rtl8152_set_msglevel(struct net_device *dev, u32 value)
{
	struct r8152 *tp = netdev_priv(dev);

	tp->msg_enable = value;
}

static void rtl8152_get_drvinfo(struct net_device *netdev,
				struct ethtool_drvinfo *info)
{
	struct r8152 *tp = netdev_priv(netdev);

	strncpy(info->driver, MODULENAME, ETHTOOL_BUSINFO_LEN);
	strncpy(info->version, DRIVER_VERSION, ETHTOOL_BUSINFO_LEN);
	usb_make_path(tp->udev, info->bus_info, sizeof(info->bus_info));
}

static
int rtl8152_get_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
{
	struct r8152 *tp = netdev_priv(netdev);

	if (!tp->mii.mdio_read)
		return -EOPNOTSUPP;

	return mii_ethtool_gset(&tp->mii, cmd);
}

static int rtl8152_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct r8152 *tp = netdev_priv(dev);
	int ret;

	ret = usb_autopm_get_interface(tp->intf);
	if (ret < 0)
		goto out;

	ret = rtl8152_set_speed(tp, cmd->autoneg, cmd->speed, cmd->duplex);

	usb_autopm_put_interface(tp->intf);

out:
	return ret;
}

static const char rtl8152_gstrings[][ETH_GSTRING_LEN] = {
	"tx_packets",
	"rx_packets",
	"tx_errors",
	"rx_errors",
	"rx_missed",
	"align_errors",
	"tx_single_collisions",
	"tx_multi_collisions",
	"rx_unicast",
	"rx_broadcast",
	"rx_multicast",
	"tx_aborted",
	"tx_underrun",
};

static int rtl8152_get_sset_count(struct net_device *dev, int sset)
{
	switch (sset) {
	case ETH_SS_STATS:
		return ARRAY_SIZE(rtl8152_gstrings);
	default:
		return -EOPNOTSUPP;
	}
}

static void rtl8152_get_ethtool_stats(struct net_device *dev,
				      struct ethtool_stats *stats, u64 *data)
{
	struct r8152 *tp = netdev_priv(dev);
	struct tally_counter tally;

	generic_ocp_read(tp, PLA_TALLYCNT, sizeof(tally), &tally, MCU_TYPE_PLA);

	data[0] = le64_to_cpu(tally.tx_packets);
	data[1] = le64_to_cpu(tally.rx_packets);
	data[2] = le64_to_cpu(tally.tx_errors);
	data[3] = le32_to_cpu(tally.rx_errors);
	data[4] = le16_to_cpu(tally.rx_missed);
	data[5] = le16_to_cpu(tally.align_errors);
	data[6] = le32_to_cpu(tally.tx_one_collision);
	data[7] = le32_to_cpu(tally.tx_multi_collision);
	data[8] = le64_to_cpu(tally.rx_unicast);
	data[9] = le64_to_cpu(tally.rx_broadcast);
	data[10] = le32_to_cpu(tally.rx_multicast);
	data[11] = le16_to_cpu(tally.tx_aborted);
	data[12] = le16_to_cpu(tally.tx_underun);
}

static void rtl8152_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
	switch (stringset) {
	case ETH_SS_STATS:
		memcpy(data, *rtl8152_gstrings, sizeof(rtl8152_gstrings));
		break;
	}
}

static struct ethtool_ops ops = {
	.get_drvinfo = rtl8152_get_drvinfo,
	.get_settings = rtl8152_get_settings,
	.set_settings = rtl8152_set_settings,
	.get_link = ethtool_op_get_link,
	.get_msglevel = rtl8152_get_msglevel,
	.set_msglevel = rtl8152_set_msglevel,
	.get_wol = rtl8152_get_wol,
	.set_wol = rtl8152_set_wol,
	.get_strings = rtl8152_get_strings,
	.get_sset_count = rtl8152_get_sset_count,
	.get_ethtool_stats = rtl8152_get_ethtool_stats,
};

static int rtl8152_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
{
	struct r8152 *tp = netdev_priv(netdev);
	struct mii_ioctl_data *data = if_mii(rq);
	int res;

	res = usb_autopm_get_interface(tp->intf);
	if (res < 0)
		goto out;

	switch (cmd) {
	case SIOCGMIIPHY:
		data->phy_id = R8152_PHY_ID; /* Internal PHY */
		break;

	case SIOCGMIIREG:
		data->val_out = r8152_mdio_read(tp, data->reg_num);
		break;

	case SIOCSMIIREG:
		if (!capable(CAP_NET_ADMIN)) {
			res = -EPERM;
			break;
		}
		r8152_mdio_write(tp, data->reg_num, data->val_in);
		break;

	default:
		res = -EOPNOTSUPP;
	}

	usb_autopm_put_interface(tp->intf);

out:
	return res;
}

static const struct net_device_ops rtl8152_netdev_ops = {
	.ndo_open		= rtl8152_open,
	.ndo_stop		= rtl8152_close,
	.ndo_do_ioctl		= rtl8152_ioctl,
	.ndo_start_xmit		= rtl8152_start_xmit,
	.ndo_tx_timeout		= rtl8152_tx_timeout,
	.ndo_set_rx_mode	= rtl8152_set_rx_mode,
	.ndo_set_mac_address	= rtl8152_set_mac_address,

	.ndo_change_mtu		= eth_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
};

static void r8152b_get_version(struct r8152 *tp)
{
	u32	ocp_data;
	u16	version;

	ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_TCR1);
	version = (u16)(ocp_data & VERSION_MASK);

	switch (version) {
	case 0x4c00:
		tp->version = RTL_VER_01;
		break;
	case 0x4c10:
		tp->version = RTL_VER_02;
		break;
	case 0x5c00:
		tp->version = RTL_VER_03;
		tp->mii.supports_gmii = 1;
		break;
	case 0x5c10:
		tp->version = RTL_VER_04;
		tp->mii.supports_gmii = 1;
		break;
	case 0x5c20:
		tp->version = RTL_VER_05;
		tp->mii.supports_gmii = 1;
		break;
	default:
		netif_info(tp, probe, tp->netdev,
			   "Unknown version 0x%04x\n", version);
		break;
	}
}

static void rtl8152_unload(struct r8152 *tp)
{
	if (tp->version != RTL_VER_01)
		r8152_power_cut_en(tp, true);
}

static void rtl8153_unload(struct r8152 *tp)
{
	r8153_power_cut_en(tp, true);
}

static int rtl_ops_init(struct r8152 *tp, const struct usb_device_id *id)
{
	struct rtl_ops *ops = &tp->rtl_ops;
	int ret = -ENODEV;

	switch (id->idVendor) {
	case VENDOR_ID_REALTEK:
		switch (id->idProduct) {
		case PRODUCT_ID_RTL8152:
			ops->init		= r8152b_init;
			ops->enable		= rtl8152_enable;
			ops->disable		= rtl8152_disable;
			ops->up			= r8152b_exit_oob;
			ops->down		= rtl8152_down;
			ops->unload		= rtl8152_unload;
			ret = 0;
			break;
		case PRODUCT_ID_RTL8153:
			ops->init		= r8153_init;
			ops->enable		= rtl8153_enable;
			ops->disable		= rtl8152_disable;
			ops->up			= r8153_first_init;
			ops->down		= rtl8153_down;
			ops->unload		= rtl8153_unload;
			ret = 0;
			break;
		default:
			break;
		}
		break;

	case VENDOR_ID_SAMSUNG:
		switch (id->idProduct) {
		case PRODUCT_ID_SAMSUNG:
			ops->init		= r8153_init;
			ops->enable		= rtl8153_enable;
			ops->disable		= rtl8152_disable;
			ops->up			= r8153_first_init;
			ops->down		= rtl8153_down;
			ops->unload		= rtl8153_unload;
			ret = 0;
			break;
		default:
			break;
		}
		break;

	default:
		break;
	}

	if (ret)
		netif_err(tp, probe, tp->netdev, "Unknown Device\n");

	return ret;
}

static int rtl8152_probe(struct usb_interface *intf,
			 const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct r8152 *tp;
	struct net_device *netdev;
	int ret;

	if (udev->actconfig->desc.bConfigurationValue != 1) {
		usb_driver_set_configuration(udev, 1);
		return -ENODEV;
	}

	usb_reset_device(udev);
	netdev = alloc_etherdev(sizeof(struct r8152));
	if (!netdev) {
		dev_err(&intf->dev, "Out of memory\n");
		return -ENOMEM;
	}

	SET_NETDEV_DEV(netdev, &intf->dev);
	tp = netdev_priv(netdev);
	tp->msg_enable = 0x7FFF;

	tp->udev = udev;
	tp->netdev = netdev;
	tp->intf = intf;

	ret = rtl_ops_init(tp, id);
	if (ret)
		goto out;

	tasklet_init(&tp->tl, bottom_half, (unsigned long)tp);
	INIT_DELAYED_WORK(&tp->schedule, rtl_work_func_t);

	netdev->netdev_ops = &rtl8152_netdev_ops;
	netdev->watchdog_timeo = RTL8152_TX_TIMEOUT;

	netdev->features |= NETIF_F_RXCSUM | NETIF_F_IP_CSUM | NETIF_F_SG |
			    NETIF_F_TSO | NETIF_F_FRAGLIST | NETIF_F_IPV6_CSUM |
			    NETIF_F_TSO6;
	netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM | NETIF_F_SG |
			      NETIF_F_TSO | NETIF_F_FRAGLIST |
			      NETIF_F_IPV6_CSUM | NETIF_F_TSO6;

	SET_ETHTOOL_OPS(netdev, &ops);
	netif_set_gso_max_size(netdev, RTL_LIMITED_TSO_SIZE);

	tp->mii.dev = netdev;
	tp->mii.mdio_read = read_mii_word;
	tp->mii.mdio_write = write_mii_word;
	tp->mii.phy_id_mask = 0x3f;
	tp->mii.reg_num_mask = 0x1f;
	tp->mii.phy_id = R8152_PHY_ID;
	tp->mii.supports_gmii = 0;

	intf->needs_remote_wakeup = 1;

	r8152b_get_version(tp);
	tp->rtl_ops.init(tp);
	set_ethernet_addr(tp);

	usb_set_intfdata(intf, tp);

	ret = register_netdev(netdev);
	if (ret != 0) {
		netif_err(tp, probe, netdev, "couldn't register the device\n");
		goto out1;
	}

	tp->saved_wolopts = __rtl_get_wol(tp);
	if (tp->saved_wolopts)
		device_set_wakeup_enable(&udev->dev, true);
	else
		device_set_wakeup_enable(&udev->dev, false);

	netif_info(tp, probe, netdev, "%s\n", DRIVER_VERSION);

	return 0;

out1:
	usb_set_intfdata(intf, NULL);
out:
	free_netdev(netdev);
	return ret;
}

static void rtl8152_disconnect(struct usb_interface *intf)
{
	struct r8152 *tp = usb_get_intfdata(intf);

	usb_set_intfdata(intf, NULL);
	if (tp) {
		set_bit(RTL8152_UNPLUG, &tp->flags);
		tasklet_kill(&tp->tl);
		unregister_netdev(tp->netdev);
		tp->rtl_ops.unload(tp);
		free_netdev(tp->netdev);
	}
}

/* table of devices that work with this driver */
static struct usb_device_id rtl8152_table[] = {
	{USB_DEVICE(VENDOR_ID_REALTEK, PRODUCT_ID_RTL8152)},
	{USB_DEVICE(VENDOR_ID_REALTEK, PRODUCT_ID_RTL8153)},
	{USB_DEVICE(VENDOR_ID_SAMSUNG, PRODUCT_ID_SAMSUNG)},
	{}
};

MODULE_DEVICE_TABLE(usb, rtl8152_table);

static struct usb_driver rtl8152_driver = {
	.name =		MODULENAME,
	.id_table =	rtl8152_table,
	.probe =	rtl8152_probe,
	.disconnect =	rtl8152_disconnect,
	.suspend =	rtl8152_suspend,
	.resume =	rtl8152_resume,
	.reset_resume =	rtl8152_resume,
	.supports_autosuspend = 1,
	.disable_hub_initiated_lpm = 1,
};

module_usb_driver(rtl8152_driver);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");