// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (c) 2014 Realtek Semiconductor Corp. All rights reserved.
 */

#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>
#include <uapi/linux/mdio.h>
#include <linux/mdio.h>
#include <linux/usb/cdc.h>
#include <linux/suspend.h>
#include <linux/acpi.h>

/* Information for net-next */
#define NETNEXT_VERSION         "09"

/* Information for net */
#define NET_VERSION             "10"

#define DRIVER_VERSION          "v1." NETNEXT_VERSION "." NET_VERSION
#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_DMY_REG0            0xc0b0
#define PLA_FMC                 0xc0b4
#define PLA_CFG_WOL             0xc0b6
#define PLA_TEREDO_CFG          0xc0bc
#define PLA_TEREDO_WAKE_BASE    0xc0c4
#define PLA_MAR                 0xcd00
#define PLA_BACKUP              0xd000
#define PLA_BDC_CR              0xd1a0
#define PLA_TEREDO_TIMER        0xd2cc
#define PLA_REALWOW_TIMER       0xd2e8
#define PLA_SUSPEND_FLAG        0xd38a
#define PLA_INDICATE_FALG       0xd38c
#define PLA_EXTRA_STATUS        0xd398
#define PLA_EFUSE_DATA          0xdd00
#define PLA_EFUSE_CMD           0xdd02
#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_MTPS                0xe615
#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_USB2PHY             0xb41e
#define USB_SSPHYLINK2          0xb428
#define USB_U2P3_CTRL           0xb460
#define USB_CSR_DUMMY1          0xb464
#define USB_CSR_DUMMY2          0xb466
#define USB_DEV_STAT            0xb808
#define USB_CONNECT_TIMER       0xcbf8
#define USB_MSC_TIMER           0xcbfc
#define USB_BURST_SIZE          0xcfc0
#define USB_LPM_CONFIG          0xcfd8
#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_TIMEOUT    0xd42c
#define USB_RX_EARLY_SIZE       0xd42e
#define USB_PM_CTRL_STATUS      0xd432  /* RTL8153A */
#define USB_RX_EXTRA_AGGR_TMR   0xd432  /* RTL8153B */
#define USB_TX_DMA              0xd434
#define USB_UPT_RXDMA_OWN       0xd437
#define USB_TOLERANCE           0xd490
#define USB_LPM_CTRL            0xd41a
#define USB_BMU_RESET           0xd4b0
#define USB_U1U2_TIMER          0xd4da
#define USB_UPS_CTRL            0xd800
#define USB_POWER_CUT           0xd80a
#define USB_MISC_0              0xd81a
#define USB_MISC_1              0xd81f
#define USB_AFE_CTRL2           0xd824
#define USB_UPS_CFG             0xd842
#define USB_UPS_FLAGS           0xd848
#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
#define USB_BP_8                0xfc38
#define USB_BP_9                0xfc3a
#define USB_BP_10               0xfc3c
#define USB_BP_11               0xfc3e
#define USB_BP_12               0xfc40
#define USB_BP_13               0xfc42
#define USB_BP_14               0xfc44
#define USB_BP_15               0xfc46
#define USB_BP2_EN              0xfc48

/* 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_NCTL_CFG            0xa42c
#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_ABLE            0xa5c4
#define OCP_EEE_ADV             0xa5d0
#define OCP_EEE_LPABLE          0xa5d2
#define OCP_PHY_STATE           0xa708          /* nway state for 8153 */
#define OCP_PHY_PATCH_STAT      0xb800
#define OCP_PHY_PATCH_CMD       0xb820
#define OCP_ADC_IOFFSET         0xbcfc
#define OCP_ADC_CFG             0xbc06
#define OCP_SYSCLK_CFG          0xc416

/* SRAM Register */
#define SRAM_GREEN_CFG          0x8011
#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_DMY_REG0 */
#define ECM_ALDPS               0x0002

/* 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_MTPS */
#define MTPS_JUMBO              (12 * 1024 / 64)
#define MTPS_DEFAULT            (6 * 1024 / 64)

/* 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

/* PLA_BDC_CR */
#define ALDPS_PROXY_MODE        0x0001

/* PLA_EFUSE_CMD */
#define EFUSE_READ_CMD          BIT(15)
#define EFUSE_DATA_BIT16        BIT(7)

/* 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
#define MAC_CLK_SPDWN_EN        BIT(15)

/* 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

/* PLA_SUSPEND_FLAG */
#define LINK_CHG_EVENT          BIT(0)

/* PLA_INDICATE_FALG */
#define UPCOMING_RUNTIME_D3     BIT(0)

/* PLA_EXTRA_STATUS */
#define LINK_CHANGE_FLAG        BIT(8)

/* USB_USB2PHY */
#define USB2PHY_SUSPEND         0x0001
#define USB2PHY_L1              0x0002

/* USB_SSPHYLINK2 */
#define pwd_dn_scale_mask       0x3ffe
#define pwd_dn_scale(x)         ((x) << 1)

/* USB_CSR_DUMMY1 */
#define DYNAMIC_BURST           0x0001

/* USB_CSR_DUMMY2 */
#define EP4_FULL_FC             0x0001

/* USB_DEV_STAT */
#define STAT_SPEED_MASK         0x0006
#define STAT_SPEED_HIGH         0x0000
#define STAT_SPEED_FULL         0x0002

/* USB_LPM_CONFIG */
#define LPM_U1U2_EN             BIT(0)

/* 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
#define RX_THR_B                0x00010001

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

/* USB_BMU_RESET */
#define BMU_RESET_EP_IN         0x01
#define BMU_RESET_EP_OUT        0x02

/* USB_UPT_RXDMA_OWN */
#define OWN_UPDATE              BIT(0)
#define OWN_CLEAR               BIT(1)

/* USB_UPS_CTRL */
#define POWER_CUT               0x0100

/* USB_PM_CTRL_STATUS */
#define RESUME_INDICATE         0x0001

/* USB_USB_CTRL */
#define RX_AGG_DISABLE          0x0010
#define RX_ZERO_EN              0x0080

/* USB_U2P3_CTRL */
#define U2P3_ENABLE             0x0001

/* USB_POWER_CUT */
#define PWR_EN                  0x0001
#define PHASE2_EN               0x0008
#define UPS_EN                  BIT(4)
#define USP_PREWAKE             BIT(5)

/* USB_MISC_0 */
#define PCUT_STATUS             0x0001

/* USB_RX_EARLY_TIMEOUT */
#define COALESCE_SUPER           85000U
#define COALESCE_HIGH           250000U
#define COALESCE_SLOW           524280U

/* USB_WDT11_CTRL */
#define TIMER11_EN              0x0001

/* USB_LPM_CTRL */
/* bit 4 ~ 5: fifo empty boundary */
#define FIFO_EMPTY_1FB          0x30    /* 0x1fb * 64 = 32448 bytes */
/* bit 2 ~ 3: LMP timer */
#define LPM_TIMER_MASK          0x0c
#define LPM_TIMER_500MS         0x04    /* 500 ms */
#define LPM_TIMER_500US         0x0c    /* 500 us */
#define ROK_EXIT_LPM            0x02

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

/* USB_UPS_CFG */
#define SAW_CNT_1MS_MASK        0x0fff

/* USB_UPS_FLAGS */
#define UPS_FLAGS_R_TUNE                BIT(0)
#define UPS_FLAGS_EN_10M_CKDIV          BIT(1)
#define UPS_FLAGS_250M_CKDIV            BIT(2)
#define UPS_FLAGS_EN_ALDPS              BIT(3)
#define UPS_FLAGS_CTAP_SHORT_DIS        BIT(4)
#define UPS_FLAGS_SPEED_MASK            (0xf << 16)
#define ups_flags_speed(x)              ((x) << 16)
#define UPS_FLAGS_EN_EEE                BIT(20)
#define UPS_FLAGS_EN_500M_EEE           BIT(21)
#define UPS_FLAGS_EN_EEE_CKDIV          BIT(22)
#define UPS_FLAGS_EEE_PLLOFF_GIGA       BIT(24)
#define UPS_FLAGS_EEE_CMOD_LV_EN        BIT(25)
#define UPS_FLAGS_EN_GREEN              BIT(26)
#define UPS_FLAGS_EN_FLOW_CTR           BIT(27)

enum spd_duplex {
        NWAY_10M_HALF = 1,
        NWAY_10M_FULL,
        NWAY_100M_HALF,
        NWAY_100M_FULL,
        NWAY_1000M_FULL,
        FORCE_10M_HALF,
        FORCE_10M_FULL,
        FORCE_100M_HALF,
        FORCE_100M_FULL,
};

/* 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_EXT_INIT       2
#define PHY_STAT_LAN_ON         3
#define PHY_STAT_PWRDN          5

/* OCP_NCTL_CFG */
#define PGA_RETURN_EN           BIT(1)

/* 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 sd_rise_time_mask       0x0070
#define sd_rise_time(x)         (min(x, 7) << 4)        /* 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 fast_snr_mask           0xff80
#define fast_snr(x)             (min(x, 0x1ff) << 7)    /* 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 */

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

/* OCP_DOWN_SPEED */
#define EN_EEE_CMODE            BIT(14)
#define EN_EEE_1000             BIT(13)
#define EN_EEE_100              BIT(12)
#define EN_10M_CLKDIV           BIT(11)
#define EN_10M_BGOFF            0x0080

/* OCP_PHY_STATE */
#define TXDIS_STATE             0x01
#define ABD_STATE               0x02

/* OCP_PHY_PATCH_STAT */
#define PATCH_READY             BIT(6)

/* OCP_PHY_PATCH_CMD */
#define PATCH_REQUEST           BIT(4)

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

/* OCP_SYSCLK_CFG */
#define clk_div_expo(x)         (min(x, 5) << 8)

/* SRAM_GREEN_CFG */
#define GREEN_ETH_EN            BIT(15)
#define R_TUNE_EN               BIT(11)

/* 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

/* MAC PASSTHRU */
#define AD_MASK                 0xfee0
#define BND_MASK                0x0004
#define BD_MASK                 0x0001
#define EFUSE                   0xcfdb
#define PASS_THRU_MASK          0x1

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

#define RTL8152_MAX_TX          4
#define RTL8152_MAX_RX          10
#define INTBUFSIZE              2
#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 RTL8153_MAX_PACKET      9216 /* 9K */
#define RTL8153_MAX_MTU         (RTL8153_MAX_PACKET - VLAN_ETH_HLEN - \
                                 ETH_FCS_LEN)
#define RTL8152_RMS             (VLAN_ETH_FRAME_LEN + ETH_FCS_LEN)
#define RTL8153_RMS             RTL8153_MAX_PACKET
#define RTL8152_TX_TIMEOUT      (5 * HZ)
#define RTL8152_NAPI_WEIGHT     64
#define rx_reserved_size(x)     ((x) + VLAN_ETH_HLEN + ETH_FCS_LEN + \
                                 sizeof(struct rx_desc) + RX_ALIGN)

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

/* Define these values to match your device */
#define VENDOR_ID_REALTEK               0x0bda
#define VENDOR_ID_MICROSOFT             0x045e
#define VENDOR_ID_SAMSUNG               0x04e8
#define VENDOR_ID_LENOVO                0x17ef
#define VENDOR_ID_LINKSYS               0x13b1
#define VENDOR_ID_NVIDIA                0x0955
#define VENDOR_ID_TPLINK                0x2357

#define MCU_TYPE_PLA                    0x0100
#define MCU_TYPE_USB                    0x0000

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_underrun;
};

struct rx_desc {
        __le32 opts1;
#define RX_LEN_MASK                     0x7fff

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

        __le32 opts3;
#define IPF                             BIT(23) /* IP checksum fail */
#define UDPF                            BIT(22) /* UDP checksum fail */
#define TCPF                            BIT(21) /* TCP checksum fail */
#define RX_VLAN_TAG                     BIT(16)

        __le32 opts4;
        __le32 opts5;
        __le32 opts6;
};

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

        __le32 opts2;
#define UDP_CS                  BIT(31) /* Calculate UDP/IP checksum */
#define TCP_CS                  BIT(30) /* Calculate TCP/IP checksum */
#define IPV4_CS                 BIT(29) /* Calculate IPv4 checksum */
#define IPV6_CS                 BIT(28) /* Calculate IPv6 checksum */
#define MSS_SHIFT               17
#define MSS_MAX                 0x7ffU
#define TCPHO_SHIFT             17
#define TCPHO_MAX               0x7ffU
#define TX_VLAN_TAG             BIT(16)
};

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 napi_struct napi;
        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, rx_queue;
        spinlock_t rx_lock, tx_lock;
        struct delayed_work schedule, hw_phy_work;
        struct mii_if_info mii;
        struct mutex control;   /* use for hw setting */
#ifdef CONFIG_PM_SLEEP
        struct notifier_block pm_notifier;
#endif

        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 *);
                int (*eee_get)(struct r8152 *, struct ethtool_eee *);
                int (*eee_set)(struct r8152 *, struct ethtool_eee *);
                bool (*in_nway)(struct r8152 *);
                void (*hw_phy_cfg)(struct r8152 *);
                void (*autosuspend_en)(struct r8152 *tp, bool enable);
        } rtl_ops;

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

enum rtl_version {
        RTL_VER_UNKNOWN = 0,
        RTL_VER_01,
        RTL_VER_02,
        RTL_VER_03,
        RTL_VER_04,
        RTL_VER_05,
        RTL_VER_06,
        RTL_VER_07,
        RTL_VER_08,
        RTL_VER_09,
        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 agg_buf_sz = 16384;

#define RTL_LIMITED_TSO_SIZE    (agg_buf_sz - sizeof(struct tx_desc) - \
                                 VLAN_ETH_HLEN - ETH_FCS_LEN)

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);
        if (ret < 0)
                memset(data, 0xff, size);
        else
                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 = kmemdup(data, size, GFP_KERNEL);
        if (!tmp)
                return -ENOMEM;

        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 void rtl_set_unplug(struct r8152 *tp)
{
        if (tp->udev->state == USB_STATE_NOTATTACHED) {
                set_bit(RTL8152_UNPLUG, &tp->flags);
                smp_mb__after_atomic();
        }
}

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;
                }
        }

        if (ret == -ENODEV)
                rtl_set_unplug(tp);

        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:
        if (ret == -ENODEV)
                rtl_set_unplug(tp);

        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_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;
        u16 byen = BYTE_EN_WORD;
        u8 shift = index & 2;

        index &= ~3;
        byen <<= shift;

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

        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;
        }

        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;
        }

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

        if (phy_id != R8152_PHY_ID)
                return -EINVAL;

        ret = r8152_mdio_read(tp, reg);

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

        if (phy_id != R8152_PHY_ID)
                return;

        r8152_mdio_write(tp, reg, val);
}

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

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

        if (!is_valid_ether_addr(addr->sa_data))
                goto out1;

        ret = usb_autopm_get_interface(tp->intf);
        if (ret < 0)
                goto out1;

        mutex_lock(&tp->control);

        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);

        mutex_unlock(&tp->control);

        usb_autopm_put_interface(tp->intf);
out1:
        return ret;
}

/* Devices containing proper chips can support a persistent
 * host system provided MAC address.
 * Examples of this are Dell TB15 and Dell WD15 docks
 */
static int vendor_mac_passthru_addr_read(struct r8152 *tp, struct sockaddr *sa)
{
        acpi_status status;
        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;
        int ret = -EINVAL;
        u32 ocp_data;
        unsigned char buf[6];

        /* test for -AD variant of RTL8153 */
        ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_MISC_0);
        if ((ocp_data & AD_MASK) == 0x1000) {
                /* test for MAC address pass-through bit */
                ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, EFUSE);
                if ((ocp_data & PASS_THRU_MASK) != 1) {
                        netif_dbg(tp, probe, tp->netdev,
                                  "No efuse for RTL8153-AD MAC pass through\n");
                        return -ENODEV;
                }
        } else {
                /* test for RTL8153-BND and RTL8153-BD */
                ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_MISC_1);
                if ((ocp_data & BND_MASK) == 0 && (ocp_data & BD_MASK) == 0) {
                        netif_dbg(tp, probe, tp->netdev,
                                  "Invalid variant for MAC pass through\n");
                        return -ENODEV;
                }
        }

        /* returns _AUXMAC_#AABBCCDDEEFF# */
        status = acpi_evaluate_object(NULL, "\\_SB.AMAC", NULL, &buffer);
        obj = (union acpi_object *)buffer.pointer;
        if (!ACPI_SUCCESS(status))
                return -ENODEV;
        if (obj->type != ACPI_TYPE_BUFFER || obj->string.length != 0x17) {
                netif_warn(tp, probe, tp->netdev,
                           "Invalid buffer for pass-thru MAC addr: (%d, %d)\n",
                           obj->type, obj->string.length);
                goto amacout;
        }
        if (strncmp(obj->string.pointer, "_AUXMAC_#", 9) != 0 ||
            strncmp(obj->string.pointer + 0x15, "#", 1) != 0) {
                netif_warn(tp, probe, tp->netdev,
                           "Invalid header when reading pass-thru MAC addr\n");
                goto amacout;
        }
        ret = hex2bin(buf, obj->string.pointer + 9, 6);
        if (!(ret == 0 && is_valid_ether_addr(buf))) {
                netif_warn(tp, probe, tp->netdev,
                           "Invalid MAC for pass-thru MAC addr: %d, %pM\n",
                           ret, buf);
                ret = -EINVAL;
                goto amacout;
        }
        memcpy(sa->sa_data, buf, 6);
        netif_info(tp, probe, tp->netdev,
                   "Using pass-thru MAC addr %pM\n", sa->sa_data);

amacout:
        kfree(obj);
        return ret;
}

static int determine_ethernet_addr(struct r8152 *tp, struct sockaddr *sa)
{
        struct net_device *dev = tp->netdev;
        int ret;

        sa->sa_family = dev->type;

        if (tp->version == RTL_VER_01) {
                ret = pla_ocp_read(tp, PLA_IDR, 8, sa->sa_data);
        } else {
                /* if device doesn't support MAC pass through this will
                 * be expected to be non-zero
                 */
                ret = vendor_mac_passthru_addr_read(tp, sa);
                if (ret < 0)
                        ret = pla_ocp_read(tp, PLA_BACKUP, 8, sa->sa_data);
        }

        if (ret < 0) {
                netif_err(tp, probe, dev, "Get ether addr fail\n");
        } else if (!is_valid_ether_addr(sa->sa_data)) {
                netif_err(tp, probe, dev, "Invalid ether addr %pM\n",
                          sa->sa_data);
                eth_hw_addr_random(dev);
                ether_addr_copy(sa->sa_data, dev->dev_addr);
                netif_info(tp, probe, dev, "Random ether addr %pM\n",
                           sa->sa_data);
                return 0;
        }

        return ret;
}

static int set_ethernet_addr(struct r8152 *tp)
{
        struct net_device *dev = tp->netdev;
        struct sockaddr sa;
        int ret;

        ret = determine_ethernet_addr(tp, &sa);
        if (ret < 0)
                return ret;

        if (tp->version == RTL_VER_01)
                ether_addr_copy(dev->dev_addr, sa.sa_data);
        else
                ret = rtl8152_set_mac_address(dev, &sa);

        return ret;
}

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

        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_irqsave(&tp->rx_lock, flags);
                list_add_tail(&agg->list, &tp->rx_done);
                spin_unlock_irqrestore(&tp->rx_lock, flags);
                napi_schedule(&tp->napi);
                return;
        case -ESHUTDOWN:
                rtl_set_unplug(tp);
                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;
        }

        r8152_submit_rx(tp, agg, GFP_ATOMIC);
}

static void write_bulk_callback(struct urb *urb)
{
        struct net_device_stats *stats;
        struct net_device *netdev;
        struct tx_agg *agg;
        struct r8152 *tp;
        unsigned long flags;
        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_irqsave(&tp->tx_lock, flags);
        list_add_tail(&agg->list, &tp->tx_free);
        spin_unlock_irqrestore(&tp->tx_lock, flags);

        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))
                napi_schedule(&tp->napi);
}

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);
                /* fall through */
        case -ENOENT:
        case -EPROTO:
                netif_info(tp, intr, tp->netdev,
                           "Stop submitting intr, status %d\n", status);
                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 (!netif_carrier_ok(tp->netdev)) {
                        set_bit(RTL8152_LINK_CHG, &tp->flags);
                        schedule_delayed_work(&tp->schedule, 0);
                }
        } else {
                if (netif_carrier_ok(tp->netdev)) {
                        netif_stop_queue(tp->netdev);
                        set_bit(RTL8152_LINK_CHG, &tp->flags);
                        schedule_delayed_work(&tp->schedule, 0);
                }
        }

resubmit:
        res = usb_submit_urb(urb, GFP_ATOMIC);
        if (res == -ENODEV) {
                rtl_set_unplug(tp);
                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->tx_free);
        INIT_LIST_HEAD(&tp->rx_done);
        skb_queue_head_init(&tp->tx_queue);
        skb_queue_head_init(&tp->rx_queue);

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

                if (buf != rx_agg_align(buf)) {
                        kfree(buf);
                        buf = kmalloc_node(agg_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(agg_buf_sz, GFP_KERNEL, node);
                if (!buf)
                        goto err1;

                if (buf != tx_agg_align(buf)) {
                        kfree(buf);
                        buf = kmalloc_node(agg_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;
}

/* 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_SG | NETIF_F_IPV6_CSUM | NETIF_F_TSO6);
                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 inline void rtl_tx_vlan_tag(struct tx_desc *desc, struct sk_buff *skb)
{
        if (skb_vlan_tag_present(skb)) {
                u32 opts2;

                opts2 = TX_VLAN_TAG | swab16(skb_vlan_tag_get(skb));
                desc->opts2 |= cpu_to_le32(opts2);
        }
}

static inline void rtl_rx_vlan_tag(struct rx_desc *desc, struct sk_buff *skb)
{
        u32 opts2 = le32_to_cpu(desc->opts2);

        if (opts2 & RX_VLAN_TAG)
                __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                                       swab16(opts2 & 0xffff));
}

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 (vlan_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 (vlan_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 = 0;
        agg->skb_len = 0;
        remain = agg_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;
                }

                rtl_tx_vlan_tag(tx_desc, skb);

                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 += skb_shinfo(skb)->gso_segs ?: 1;

                dev_kfree_skb_any(skb);

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

                if (test_bit(DELL_TB_RX_AGG_BUG, &tp->flags))
                        break;
        }

        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->netdev->features & NETIF_F_RXCSUM))
                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_UNNECESSARY;
                else if ((opts2 & RD_TCP_CS) && !(opts3 & TCPF))
                        checksum = CHECKSUM_UNNECESSARY;
        } else if (opts2 & 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 int rx_bottom(struct r8152 *tp, int budget)
{
        unsigned long flags;
        struct list_head *cursor, *next, rx_queue;
        int ret = 0, work_done = 0;
        struct napi_struct *napi = &tp->napi;

        if (!skb_queue_empty(&tp->rx_queue)) {
                while (work_done < budget) {
                        struct sk_buff *skb = __skb_dequeue(&tp->rx_queue);
                        struct net_device *netdev = tp->netdev;
                        struct net_device_stats *stats = &netdev->stats;
                        unsigned int pkt_len;

                        if (!skb)
                                break;

                        pkt_len = skb->len;
                        napi_gro_receive(napi, skb);
                        work_done++;
                        stats->rx_packets++;
                        stats->rx_bytes += pkt_len;
                }
        }

        if (list_empty(&tp->rx_done))
                goto out1;

        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;

                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;

                        /* limite the skb numbers for rx_queue */
                        if (unlikely(skb_queue_len(&tp->rx_queue) >= 1000))
                                break;

                        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 -= ETH_FCS_LEN;
                        rx_data += sizeof(struct rx_desc);

                        skb = napi_alloc_skb(napi, 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);
                        rtl_rx_vlan_tag(rx_desc, skb);
                        if (work_done < budget) {
                                napi_gro_receive(napi, skb);
                                work_done++;
                                stats->rx_packets++;
                                stats->rx_bytes += pkt_len;

                        } else {
                                __skb_queue_tail(&tp->rx_queue, skb);
                        }

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

submit:
                if (!ret) {
                        ret = r8152_submit_rx(tp, agg, GFP_ATOMIC);
                } else {
                        urb->actual_length = 0;
                        list_add_tail(&agg->list, next);
                }
        }

        if (!list_empty(&rx_queue)) {
                spin_lock_irqsave(&tp->rx_lock, flags);
                list_splice_tail(&rx_queue, &tp->rx_done);
                spin_unlock_irqrestore(&tp->rx_lock, flags);
        }

out1:
        return work_done;
}

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) {
                                rtl_set_unplug(tp);
                                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(struct r8152 *tp)
{
        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;

        clear_bit(SCHEDULE_NAPI, &tp->flags);

        tx_bottom(tp);
}

static int r8152_poll(struct napi_struct *napi, int budget)
{
        struct r8152 *tp = container_of(napi, struct r8152, napi);
        int work_done;

        work_done = rx_bottom(tp, budget);
        bottom_half(tp);

        if (work_done < budget) {
                if (!napi_complete_done(napi, work_done))
                        goto out;
                if (!list_empty(&tp->rx_done))
                        napi_schedule(napi);
                else if (!skb_queue_empty(&tp->tx_queue) &&
                         !list_empty(&tp->tx_free))
                        napi_schedule(napi);
        }

out:
        return work_done;
}

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

        /* The rx would be stopped, so skip submitting */
        if (test_bit(RTL8152_UNPLUG, &tp->flags) ||
            !test_bit(WORK_ENABLE, &tp->flags) || !netif_carrier_ok(tp->netdev))
                return 0;

        usb_fill_bulk_urb(agg->urb, tp->udev, usb_rcvbulkpipe(tp->udev, 1),
                          agg->head, agg_buf_sz,
                          (usb_complete_t)read_bulk_callback, agg);

        ret = usb_submit_urb(agg->urb, mem_flags);
        if (ret == -ENODEV) {
                rtl_set_unplug(tp);
                netif_device_detach(tp->netdev);
        } else if (ret) {
                struct urb *urb = agg->urb;
                unsigned long flags;

                urb->actual_length = 0;
                spin_lock_irqsave(&tp->rx_lock, flags);
                list_add_tail(&agg->list, &tp->rx_done);
                spin_unlock_irqrestore(&tp->rx_lock, flags);

                netif_err(tp, rx_err, tp->netdev,
                          "Couldn't submit rx[%p], ret = %d\n", agg, ret);

                napi_schedule(&tp->napi);
        }

        return ret;
}

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);

        netif_warn(tp, tx_err, netdev, "Tx timeout\n");

        usb_queue_reset_device(tp->intf);
}

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

        if (netif_carrier_ok(netdev)) {
                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;

        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] = 0xffffffff;
                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] = 0xffffffff;
                mc_filter[0] = 0xffffffff;
        } else {
                struct netdev_hw_addr *ha;

                mc_filter[1] = 0;
                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_features_t
rtl8152_features_check(struct sk_buff *skb, struct net_device *dev,
                       netdev_features_t features)
{
        u32 mss = skb_shinfo(skb)->gso_size;
        int max_offset = mss ? GTTCPHO_MAX : TCPHO_MAX;
        int offset = skb_transport_offset(skb);

        if ((mss || skb->ip_summed == CHECKSUM_PARTIAL) && offset > max_offset)
                features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
        else if ((skb->len + sizeof(struct tx_desc)) > agg_buf_sz)
                features &= ~NETIF_F_GSO_MASK;

        return features;
}

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_NAPI, &tp->flags);
                        schedule_delayed_work(&tp->schedule, 0);
                } else {
                        usb_mark_last_busy(tp->udev);
                        napi_schedule(&tp->napi);
                }
        } 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;
                usleep_range(100, 400);
        }
}

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

        tp->tx_qlen = agg_buf_sz / (netdev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN +
                                    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_start_rx(struct r8152 *tp)
{
        int i, ret = 0;

        INIT_LIST_HEAD(&tp->rx_done);
        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);
                if (ret)
                        break;
        }

        if (ret && ++i < RTL8152_MAX_RX) {
                struct list_head rx_queue;
                unsigned long flags;

                INIT_LIST_HEAD(&rx_queue);

                do {
                        struct rx_agg *agg = &tp->rx_info[i++];
                        struct urb *urb = agg->urb;

                        urb->actual_length = 0;
                        list_add_tail(&agg->list, &rx_queue);
                } while (i < RTL8152_MAX_RX);

                spin_lock_irqsave(&tp->rx_lock, flags);
                list_splice_tail(&rx_queue, &tp->rx_done);
                spin_unlock_irqrestore(&tp->rx_lock, flags);
        }

        return ret;
}

static int rtl_stop_rx(struct r8152 *tp)
{
        int i;

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

        while (!skb_queue_empty(&tp->rx_queue))
                dev_kfree_skb(__skb_dequeue(&tp->rx_queue));

        return 0;
}

static inline void r8153b_rx_agg_chg_indicate(struct r8152 *tp)
{
        ocp_write_byte(tp, MCU_TYPE_USB, USB_UPT_RXDMA_OWN,
                       OWN_UPDATE | OWN_CLEAR);
}

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

        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);

        switch (tp->version) {
        case RTL_VER_08:
        case RTL_VER_09:
                r8153b_rx_agg_chg_indicate(tp);
                break;
        default:
                break;
        }

        rxdy_gated_en(tp, false);

        return 0;
}

static int rtl8152_enable(struct r8152 *tp)
{
        if (test_bit(RTL8152_UNPLUG, &tp->flags))
                return -ENODEV;

        set_tx_qlen(tp);
        rtl_set_eee_plus(tp);

        return rtl_enable(tp);
}

static void r8153_set_rx_early_timeout(struct r8152 *tp)
{
        u32 ocp_data = tp->coalesce / 8;

        switch (tp->version) {
        case RTL_VER_03:
        case RTL_VER_04:
        case RTL_VER_05:
        case RTL_VER_06:
                ocp_write_word(tp, MCU_TYPE_USB, USB_RX_EARLY_TIMEOUT,
                               ocp_data);
                break;

        case RTL_VER_08:
        case RTL_VER_09:
                /* The RTL8153B uses USB_RX_EXTRA_AGGR_TMR for rx timeout
                 * primarily. For USB_RX_EARLY_TIMEOUT, we fix it to 128ns.
                 */
                ocp_write_word(tp, MCU_TYPE_USB, USB_RX_EARLY_TIMEOUT,
                               128 / 8);
                ocp_write_word(tp, MCU_TYPE_USB, USB_RX_EXTRA_AGGR_TMR,
                               ocp_data);
                break;

        default:
                break;
        }
}

static void r8153_set_rx_early_size(struct r8152 *tp)
{
        u32 ocp_data = agg_buf_sz - rx_reserved_size(tp->netdev->mtu);

        switch (tp->version) {
        case RTL_VER_03:
        case RTL_VER_04:
        case RTL_VER_05:
        case RTL_VER_06:
                ocp_write_word(tp, MCU_TYPE_USB, USB_RX_EARLY_SIZE,
                               ocp_data / 4);
                break;
        case RTL_VER_08:
        case RTL_VER_09:
                ocp_write_word(tp, MCU_TYPE_USB, USB_RX_EARLY_SIZE,
                               ocp_data / 8);
                break;
        default:
                WARN_ON_ONCE(1);
                break;
        }
}

static int rtl8153_enable(struct r8152 *tp)
{
        if (test_bit(RTL8152_UNPLUG, &tp->flags))
                return -ENODEV;

        set_tx_qlen(tp);
        rtl_set_eee_plus(tp);
        r8153_set_rx_early_timeout(tp);
        r8153_set_rx_early_size(tp);

        return rtl_enable(tp);
}

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

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

        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;
                usleep_range(1000, 2000);
        }

        for (i = 0; i < 1000; i++) {
                if (ocp_read_word(tp, MCU_TYPE_PLA, PLA_TCR0) & TCR0_TX_EMPTY)
                        break;
                usleep_range(1000, 2000);
        }

        rtl_stop_rx(tp);

        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);
}

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

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

static int rtl8152_set_features(struct net_device *dev,
                                netdev_features_t features)
{
        netdev_features_t changed = features ^ dev->features;
        struct r8152 *tp = netdev_priv(dev);
        int ret;

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

        mutex_lock(&tp->control);

        if (changed & NETIF_F_HW_VLAN_CTAG_RX) {
                if (features & NETIF_F_HW_VLAN_CTAG_RX)
                        rtl_rx_vlan_en(tp, true);
                else
                        rtl_rx_vlan_en(tp, false);
        }

        mutex_unlock(&tp->control);

        usb_autopm_put_interface(tp->intf);

out:
        return ret;
}

#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_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);
        if (wolopts & WAKE_UCAST)
                ocp_data |= UWF_EN;
        if (wolopts & WAKE_BCAST)
                ocp_data |= BWF_EN;
        if (wolopts & WAKE_MCAST)
                ocp_data |= MWF_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 r8153_mac_clk_spd(struct r8152 *tp, bool enable)
{
        /* MAC clock speed down */
        if (enable) {
                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 | EEE_SPDWN_EN |
                               TP1000_SPDWN_EN);
        } else {
                ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL, 0);
                ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL2, 0);
                ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL3, 0);
                ocp_write_word(tp, MCU_TYPE_PLA, PLA_MAC_PWR_CTRL4, 0);
        }
}

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 r8153b_u1u2en(struct r8152 *tp, bool enable)
{
        u32 ocp_data;

        ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_LPM_CONFIG);
        if (enable)
                ocp_data |= LPM_U1U2_EN;
        else
                ocp_data &= ~LPM_U1U2_EN;

        ocp_write_word(tp, MCU_TYPE_USB, USB_LPM_CONFIG, ocp_data);
}

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 r8153b_ups_flags_w1w0(struct r8152 *tp, u32 set, u32 clear)
{
        u32 ocp_data;

        ocp_data = ocp_read_dword(tp, MCU_TYPE_USB, USB_UPS_FLAGS);
        ocp_data &= ~clear;
        ocp_data |= set;
        ocp_write_dword(tp, MCU_TYPE_USB, USB_UPS_FLAGS, ocp_data);
}

static void r8153b_green_en(struct r8152 *tp, bool enable)
{
        u16 data;

        if (enable) {
                sram_write(tp, 0x8045, 0);      /* 10M abiq&ldvbias */
                sram_write(tp, 0x804d, 0x1222); /* 100M short abiq&ldvbias */
                sram_write(tp, 0x805d, 0x0022); /* 1000M short abiq&ldvbias */
        } else {
                sram_write(tp, 0x8045, 0x2444); /* 10M abiq&ldvbias */
                sram_write(tp, 0x804d, 0x2444); /* 100M short abiq&ldvbias */
                sram_write(tp, 0x805d, 0x2444); /* 1000M short abiq&ldvbias */
        }

        data = sram_read(tp, SRAM_GREEN_CFG);
        data |= GREEN_ETH_EN;
        sram_write(tp, SRAM_GREEN_CFG, data);

        r8153b_ups_flags_w1w0(tp, UPS_FLAGS_EN_GREEN, 0);
}

static u16 r8153_phy_status(struct r8152 *tp, u16 desired)
{
        u16 data;
        int i;

        for (i = 0; i < 500; i++) {
                data = ocp_reg_read(tp, OCP_PHY_STATUS);
                data &= PHY_STAT_MASK;
                if (desired) {
                        if (data == desired)
                                break;
                } else if (data == PHY_STAT_LAN_ON || data == PHY_STAT_PWRDN ||
                           data == PHY_STAT_EXT_INIT) {
                        break;
                }

                msleep(20);
        }

        return data;
}

static void r8153b_ups_en(struct r8152 *tp, bool enable)
{
        u32 ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_POWER_CUT);

        if (enable) {
                ocp_data |= UPS_EN | USP_PREWAKE | PHASE2_EN;
                ocp_write_byte(tp, MCU_TYPE_USB, USB_POWER_CUT, ocp_data);

                ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, 0xcfff);
                ocp_data |= BIT(0);
                ocp_write_byte(tp, MCU_TYPE_USB, 0xcfff, ocp_data);
        } else {
                u16 data;

                ocp_data &= ~(UPS_EN | USP_PREWAKE);
                ocp_write_byte(tp, MCU_TYPE_USB, USB_POWER_CUT, ocp_data);

                ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, 0xcfff);
                ocp_data &= ~BIT(0);
                ocp_write_byte(tp, MCU_TYPE_USB, 0xcfff, 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);

                data = r8153_phy_status(tp, 0);

                switch (data) {
                case PHY_STAT_PWRDN:
                case PHY_STAT_EXT_INIT:
                        r8153b_green_en(tp,
                                        test_bit(GREEN_ETHERNET, &tp->flags));

                        data = r8152_mdio_read(tp, MII_BMCR);
                        data &= ~BMCR_PDOWN;
                        data |= BMCR_RESET;
                        r8152_mdio_write(tp, MII_BMCR, data);

                        data = r8153_phy_status(tp, PHY_STAT_LAN_ON);
                        /* fall through */

                default:
                        if (data != PHY_STAT_LAN_ON)
                                netif_warn(tp, link, tp->netdev,
                                           "PHY not ready");
                        break;
                }
        }
}

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 r8153b_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;
        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_queue_wake(struct r8152 *tp, bool enable)
{
        u32 ocp_data;

        ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_INDICATE_FALG);
        if (enable)
                ocp_data |= UPCOMING_RUNTIME_D3;
        else
                ocp_data &= ~UPCOMING_RUNTIME_D3;
        ocp_write_byte(tp, MCU_TYPE_PLA, PLA_INDICATE_FALG, ocp_data);

        ocp_data = ocp_read_byte(tp, MCU_TYPE_PLA, PLA_SUSPEND_FLAG);
        ocp_data &= ~LINK_CHG_EVENT;
        ocp_write_byte(tp, MCU_TYPE_PLA, PLA_SUSPEND_FLAG, ocp_data);

        ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_EXTRA_STATUS);
        ocp_data &= ~LINK_CHANGE_FLAG;
        ocp_write_word(tp, MCU_TYPE_PLA, PLA_EXTRA_STATUS, ocp_data);
}

static bool rtl_can_wakeup(struct r8152 *tp)
{
        struct usb_device *udev = tp->udev;

        return (udev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_WAKEUP);
}

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 {
                u32 ocp_data;

                __rtl_set_wol(tp, tp->saved_wolopts);

                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);
        }
}

static void rtl8153_runtime_enable(struct r8152 *tp, bool enable)
{
        if (enable) {
                r8153_u1u2en(tp, false);
                r8153_u2p3en(tp, false);
                r8153_mac_clk_spd(tp, true);
                rtl_runtime_suspend_enable(tp, true);
        } else {
                rtl_runtime_suspend_enable(tp, false);
                r8153_mac_clk_spd(tp, false);

                switch (tp->version) {
                case RTL_VER_03:
                case RTL_VER_04:
                        break;
                case RTL_VER_05:
                case RTL_VER_06:
                default:
                        r8153_u2p3en(tp, true);
                        break;
                }

                r8153_u1u2en(tp, true);
        }
}

static void rtl8153b_runtime_enable(struct r8152 *tp, bool enable)
{
        if (enable) {
                r8153_queue_wake(tp, true);
                r8153b_u1u2en(tp, false);
                r8153_u2p3en(tp, false);
                rtl_runtime_suspend_enable(tp, true);
                r8153b_ups_en(tp, true);
        } else {
                r8153b_ups_en(tp, false);
                r8153_queue_wake(tp, false);
                rtl_runtime_suspend_enable(tp, false);
                r8153_u2p3en(tp, true);
                r8153b_u1u2en(tp, true);
        }
}

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

        switch (tp->version) {
        case RTL_VER_01:
        case RTL_VER_02:
        case RTL_VER_03:
        case RTL_VER_04:
        case RTL_VER_05:
        case RTL_VER_06:
        case RTL_VER_07:
                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);
                break;

        case RTL_VER_08:
        case RTL_VER_09:
                /* The bit 0 ~ 7 are relative with teredo settings. They are
                 * W1C (write 1 to clear), so set all 1 to disable it.
                 */
                ocp_write_byte(tp, MCU_TYPE_PLA, PLA_TEREDO_CFG, 0xff);
                break;

        default:
                break;
        }

        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 rtl_reset_bmu(struct r8152 *tp)
{
        u32 ocp_data;

        ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_BMU_RESET);
        ocp_data &= ~(BMU_RESET_EP_IN | BMU_RESET_EP_OUT);
        ocp_write_byte(tp, MCU_TYPE_USB, USB_BMU_RESET, ocp_data);
        ocp_data |= BMU_RESET_EP_IN | BMU_RESET_EP_OUT;
        ocp_write_byte(tp, MCU_TYPE_USB, USB_BMU_RESET, ocp_data);
}

static void r8152_aldps_en(struct r8152 *tp, bool enable)
{
        if (enable) {
                ocp_reg_write(tp, OCP_ALDPS_CONFIG, ENPWRSAVE | ENPDNPS |
                                                    LINKENA | DIS_SDSAVE);
        } else {
                ocp_reg_write(tp, OCP_ALDPS_CONFIG, ENPDNPS | LINKENA |
                                                    DIS_SDSAVE);
                msleep(20);
        }
}

static inline void r8152_mmd_indirect(struct r8152 *tp, u16 dev, u16 reg)
{
        ocp_reg_write(tp, OCP_EEE_AR, FUN_ADDR | dev);
        ocp_reg_write(tp, OCP_EEE_DATA, reg);
        ocp_reg_write(tp, OCP_EEE_AR, FUN_DATA | dev);