/* SPDX-License-Identifier: GPL-2.0+ */
/* Copyright (C) 2018 Microchip Technology Inc. */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/crc32.h>
#include <linux/microchipphy.h>
#include <linux/net_tstamp.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/rtnetlink.h>
#include <linux/iopoll.h>
#include <linux/crc16.h>
#include "lan743x_main.h"
#include "lan743x_ethtool.h"

static void lan743x_pci_cleanup(struct lan743x_adapter *adapter)
{
        pci_release_selected_regions(adapter->pdev,
                                     pci_select_bars(adapter->pdev,
                                                     IORESOURCE_MEM));
        pci_disable_device(adapter->pdev);
}

static int lan743x_pci_init(struct lan743x_adapter *adapter,
                            struct pci_dev *pdev)
{
        unsigned long bars = 0;
        int ret;

        adapter->pdev = pdev;
        ret = pci_enable_device_mem(pdev);
        if (ret)
                goto return_error;

        netif_info(adapter, probe, adapter->netdev,
                   "PCI: Vendor ID = 0x%04X, Device ID = 0x%04X\n",
                   pdev->vendor, pdev->device);
        bars = pci_select_bars(pdev, IORESOURCE_MEM);
        if (!test_bit(0, &bars))
                goto disable_device;

        ret = pci_request_selected_regions(pdev, bars, DRIVER_NAME);
        if (ret)
                goto disable_device;

        pci_set_master(pdev);
        return 0;

disable_device:
        pci_disable_device(adapter->pdev);

return_error:
        return ret;
}

u32 lan743x_csr_read(struct lan743x_adapter *adapter, int offset)
{
        return ioread32(&adapter->csr.csr_address[offset]);
}

void lan743x_csr_write(struct lan743x_adapter *adapter, int offset,
                       u32 data)
{
        iowrite32(data, &adapter->csr.csr_address[offset]);
}

#define LAN743X_CSR_READ_OP(offset)     lan743x_csr_read(adapter, offset)

static int lan743x_csr_light_reset(struct lan743x_adapter *adapter)
{
        u32 data;

        data = lan743x_csr_read(adapter, HW_CFG);
        data |= HW_CFG_LRST_;
        lan743x_csr_write(adapter, HW_CFG, data);

        return readx_poll_timeout(LAN743X_CSR_READ_OP, HW_CFG, data,
                                  !(data & HW_CFG_LRST_), 100000, 10000000);
}

static int lan743x_csr_wait_for_bit(struct lan743x_adapter *adapter,
                                    int offset, u32 bit_mask,
                                    int target_value, int usleep_min,
                                    int usleep_max, int count)
{
        u32 data;

        return readx_poll_timeout(LAN743X_CSR_READ_OP, offset, data,
                                  target_value == ((data & bit_mask) ? 1 : 0),
                                  usleep_max, usleep_min * count);
}

static int lan743x_csr_init(struct lan743x_adapter *adapter)
{
        struct lan743x_csr *csr = &adapter->csr;
        resource_size_t bar_start, bar_length;
        int result;

        bar_start = pci_resource_start(adapter->pdev, 0);
        bar_length = pci_resource_len(adapter->pdev, 0);
        csr->csr_address = devm_ioremap(&adapter->pdev->dev,
                                        bar_start, bar_length);
        if (!csr->csr_address) {
                result = -ENOMEM;
                goto clean_up;
        }

        csr->id_rev = lan743x_csr_read(adapter, ID_REV);
        csr->fpga_rev = lan743x_csr_read(adapter, FPGA_REV);
        netif_info(adapter, probe, adapter->netdev,
                   "ID_REV = 0x%08X, FPGA_REV = %d.%d\n",
                   csr->id_rev, FPGA_REV_GET_MAJOR_(csr->fpga_rev),
                   FPGA_REV_GET_MINOR_(csr->fpga_rev));
        if (!ID_REV_IS_VALID_CHIP_ID_(csr->id_rev)) {
                result = -ENODEV;
                goto clean_up;
        }

        csr->flags = LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR;
        switch (csr->id_rev & ID_REV_CHIP_REV_MASK_) {
        case ID_REV_CHIP_REV_A0_:
                csr->flags |= LAN743X_CSR_FLAG_IS_A0;
                csr->flags &= ~LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR;
                break;
        case ID_REV_CHIP_REV_B0_:
                csr->flags |= LAN743X_CSR_FLAG_IS_B0;
                break;
        }

        result = lan743x_csr_light_reset(adapter);
        if (result)
                goto clean_up;
        return 0;
clean_up:
        return result;
}

static void lan743x_intr_software_isr(struct lan743x_adapter *adapter)
{
        struct lan743x_intr *intr = &adapter->intr;

        /* disable the interrupt to prevent repeated re-triggering */
        lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_SW_GP_);
        intr->software_isr_flag = true;
        wake_up(&intr->software_isr_wq);
}

static void lan743x_tx_isr(void *context, u32 int_sts, u32 flags)
{
        struct lan743x_tx *tx = context;
        struct lan743x_adapter *adapter = tx->adapter;
        bool enable_flag = true;

        lan743x_csr_read(adapter, INT_EN_SET);
        if (flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR) {
                lan743x_csr_write(adapter, INT_EN_CLR,
                                  INT_BIT_DMA_TX_(tx->channel_number));
        }

        if (int_sts & INT_BIT_DMA_TX_(tx->channel_number)) {
                u32 ioc_bit = DMAC_INT_BIT_TX_IOC_(tx->channel_number);
                u32 dmac_int_sts;
                u32 dmac_int_en;

                if (flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ)
                        dmac_int_sts = lan743x_csr_read(adapter, DMAC_INT_STS);
                else
                        dmac_int_sts = ioc_bit;
                if (flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK)
                        dmac_int_en = lan743x_csr_read(adapter,
                                                       DMAC_INT_EN_SET);
                else
                        dmac_int_en = ioc_bit;

                dmac_int_en &= ioc_bit;
                dmac_int_sts &= dmac_int_en;
                if (dmac_int_sts & ioc_bit) {
                        napi_schedule(&tx->napi);
                        enable_flag = false;/* poll func will enable later */
                }
        }

        if (enable_flag)
                /* enable isr */
                lan743x_csr_write(adapter, INT_EN_SET,
                                  INT_BIT_DMA_TX_(tx->channel_number));
}

static void lan743x_rx_isr(void *context, u32 int_sts, u32 flags)
{
        struct lan743x_rx *rx = context;
        struct lan743x_adapter *adapter = rx->adapter;
        bool enable_flag = true;

        if (flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR) {
                lan743x_csr_write(adapter, INT_EN_CLR,
                                  INT_BIT_DMA_RX_(rx->channel_number));
        }

        if (int_sts & INT_BIT_DMA_RX_(rx->channel_number)) {
                u32 rx_frame_bit = DMAC_INT_BIT_RXFRM_(rx->channel_number);
                u32 dmac_int_sts;
                u32 dmac_int_en;

                if (flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ)
                        dmac_int_sts = lan743x_csr_read(adapter, DMAC_INT_STS);
                else
                        dmac_int_sts = rx_frame_bit;
                if (flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK)
                        dmac_int_en = lan743x_csr_read(adapter,
                                                       DMAC_INT_EN_SET);
                else
                        dmac_int_en = rx_frame_bit;

                dmac_int_en &= rx_frame_bit;
                dmac_int_sts &= dmac_int_en;
                if (dmac_int_sts & rx_frame_bit) {
                        napi_schedule(&rx->napi);
                        enable_flag = false;/* poll funct will enable later */
                }
        }

        if (enable_flag) {
                /* enable isr */
                lan743x_csr_write(adapter, INT_EN_SET,
                                  INT_BIT_DMA_RX_(rx->channel_number));
        }
}

static void lan743x_intr_shared_isr(void *context, u32 int_sts, u32 flags)
{
        struct lan743x_adapter *adapter = context;
        unsigned int channel;

        if (int_sts & INT_BIT_ALL_RX_) {
                for (channel = 0; channel < LAN743X_USED_RX_CHANNELS;
                        channel++) {
                        u32 int_bit = INT_BIT_DMA_RX_(channel);

                        if (int_sts & int_bit) {
                                lan743x_rx_isr(&adapter->rx[channel],
                                               int_bit, flags);
                                int_sts &= ~int_bit;
                        }
                }
        }
        if (int_sts & INT_BIT_ALL_TX_) {
                for (channel = 0; channel < LAN743X_USED_TX_CHANNELS;
                        channel++) {
                        u32 int_bit = INT_BIT_DMA_TX_(channel);

                        if (int_sts & int_bit) {
                                lan743x_tx_isr(&adapter->tx[channel],
                                               int_bit, flags);
                                int_sts &= ~int_bit;
                        }
                }
        }
        if (int_sts & INT_BIT_ALL_OTHER_) {
                if (int_sts & INT_BIT_SW_GP_) {
                        lan743x_intr_software_isr(adapter);
                        int_sts &= ~INT_BIT_SW_GP_;
                }
                if (int_sts & INT_BIT_1588_) {
                        lan743x_ptp_isr(adapter);
                        int_sts &= ~INT_BIT_1588_;
                }
        }
        if (int_sts)
                lan743x_csr_write(adapter, INT_EN_CLR, int_sts);
}

static irqreturn_t lan743x_intr_entry_isr(int irq, void *ptr)
{
        struct lan743x_vector *vector = ptr;
        struct lan743x_adapter *adapter = vector->adapter;
        irqreturn_t result = IRQ_NONE;
        u32 int_enables;
        u32 int_sts;

        if (vector->flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ) {
                int_sts = lan743x_csr_read(adapter, INT_STS);
        } else if (vector->flags &
                   (LAN743X_VECTOR_FLAG_SOURCE_STATUS_R2C |
                   LAN743X_VECTOR_FLAG_SOURCE_ENABLE_R2C)) {
                int_sts = lan743x_csr_read(adapter, INT_STS_R2C);
        } else {
                /* use mask as implied status */
                int_sts = vector->int_mask | INT_BIT_MAS_;
        }

        if (!(int_sts & INT_BIT_MAS_))
                goto irq_done;

        if (vector->flags & LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_CLEAR)
                /* disable vector interrupt */
                lan743x_csr_write(adapter,
                                  INT_VEC_EN_CLR,
                                  INT_VEC_EN_(vector->vector_index));

        if (vector->flags & LAN743X_VECTOR_FLAG_MASTER_ENABLE_CLEAR)
                /* disable master interrupt */
                lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_MAS_);

        if (vector->flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK) {
                int_enables = lan743x_csr_read(adapter, INT_EN_SET);
        } else {
                /*  use vector mask as implied enable mask */
                int_enables = vector->int_mask;
        }

        int_sts &= int_enables;
        int_sts &= vector->int_mask;
        if (int_sts) {
                if (vector->handler) {
                        vector->handler(vector->context,
                                        int_sts, vector->flags);
                } else {
                        /* disable interrupts on this vector */
                        lan743x_csr_write(adapter, INT_EN_CLR,
                                          vector->int_mask);
                }
                result = IRQ_HANDLED;
        }

        if (vector->flags & LAN743X_VECTOR_FLAG_MASTER_ENABLE_SET)
                /* enable master interrupt */
                lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_MAS_);

        if (vector->flags & LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_SET)
                /* enable vector interrupt */
                lan743x_csr_write(adapter,
                                  INT_VEC_EN_SET,
                                  INT_VEC_EN_(vector->vector_index));
irq_done:
        return result;
}

static int lan743x_intr_test_isr(struct lan743x_adapter *adapter)
{
        struct lan743x_intr *intr = &adapter->intr;
        int ret;

        intr->software_isr_flag = false;

        /* enable and activate test interrupt */
        lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_SW_GP_);
        lan743x_csr_write(adapter, INT_SET, INT_BIT_SW_GP_);

        ret = wait_event_timeout(intr->software_isr_wq,
                                 intr->software_isr_flag,
                                 msecs_to_jiffies(200));

        /* disable test interrupt */
        lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_SW_GP_);

        return ret > 0 ? 0 : -ENODEV;
}

static int lan743x_intr_register_isr(struct lan743x_adapter *adapter,
                                     int vector_index, u32 flags,
                                     u32 int_mask,
                                     lan743x_vector_handler handler,
                                     void *context)
{
        struct lan743x_vector *vector = &adapter->intr.vector_list
                                        [vector_index];
        int ret;

        vector->adapter = adapter;
        vector->flags = flags;
        vector->vector_index = vector_index;
        vector->int_mask = int_mask;
        vector->handler = handler;
        vector->context = context;

        ret = request_irq(vector->irq,
                          lan743x_intr_entry_isr,
                          (flags & LAN743X_VECTOR_FLAG_IRQ_SHARED) ?
                          IRQF_SHARED : 0, DRIVER_NAME, vector);
        if (ret) {
                vector->handler = NULL;
                vector->context = NULL;
                vector->int_mask = 0;
                vector->flags = 0;
        }
        return ret;
}

static void lan743x_intr_unregister_isr(struct lan743x_adapter *adapter,
                                        int vector_index)
{
        struct lan743x_vector *vector = &adapter->intr.vector_list
                                        [vector_index];

        free_irq(vector->irq, vector);
        vector->handler = NULL;
        vector->context = NULL;
        vector->int_mask = 0;
        vector->flags = 0;
}

static u32 lan743x_intr_get_vector_flags(struct lan743x_adapter *adapter,
                                         u32 int_mask)
{
        int index;

        for (index = 0; index < LAN743X_MAX_VECTOR_COUNT; index++) {
                if (adapter->intr.vector_list[index].int_mask & int_mask)
                        return adapter->intr.vector_list[index].flags;
        }
        return 0;
}

static void lan743x_intr_close(struct lan743x_adapter *adapter)
{
        struct lan743x_intr *intr = &adapter->intr;
        int index = 0;

        lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_MAS_);
        lan743x_csr_write(adapter, INT_VEC_EN_CLR, 0x000000FF);

        for (index = 0; index < LAN743X_MAX_VECTOR_COUNT; index++) {
                if (intr->flags & INTR_FLAG_IRQ_REQUESTED(index)) {
                        lan743x_intr_unregister_isr(adapter, index);
                        intr->flags &= ~INTR_FLAG_IRQ_REQUESTED(index);
                }
        }

        if (intr->flags & INTR_FLAG_MSI_ENABLED) {
                pci_disable_msi(adapter->pdev);
                intr->flags &= ~INTR_FLAG_MSI_ENABLED;
        }

        if (intr->flags & INTR_FLAG_MSIX_ENABLED) {
                pci_disable_msix(adapter->pdev);
                intr->flags &= ~INTR_FLAG_MSIX_ENABLED;
        }
}

static int lan743x_intr_open(struct lan743x_adapter *adapter)
{
        struct msix_entry msix_entries[LAN743X_MAX_VECTOR_COUNT];
        struct lan743x_intr *intr = &adapter->intr;
        u32 int_vec_en_auto_clr = 0;
        u32 int_vec_map0 = 0;
        u32 int_vec_map1 = 0;
        int ret = -ENODEV;
        int index = 0;
        u32 flags = 0;

        intr->number_of_vectors = 0;

        /* Try to set up MSIX interrupts */
        memset(&msix_entries[0], 0,
               sizeof(struct msix_entry) * LAN743X_MAX_VECTOR_COUNT);
        for (index = 0; index < LAN743X_MAX_VECTOR_COUNT; index++)
                msix_entries[index].entry = index;
        ret = pci_enable_msix_range(adapter->pdev,
                                    msix_entries, 1,
                                    1 + LAN743X_USED_TX_CHANNELS +
                                    LAN743X_USED_RX_CHANNELS);

        if (ret > 0) {
                intr->flags |= INTR_FLAG_MSIX_ENABLED;
                intr->number_of_vectors = ret;
                intr->using_vectors = true;
                for (index = 0; index < intr->number_of_vectors; index++)
                        intr->vector_list[index].irq = msix_entries
                                                       [index].vector;
                netif_info(adapter, ifup, adapter->netdev,
                           "using MSIX interrupts, number of vectors = %d\n",
                           intr->number_of_vectors);
        }

        /* If MSIX failed try to setup using MSI interrupts */
        if (!intr->number_of_vectors) {
                if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0)) {
                        if (!pci_enable_msi(adapter->pdev)) {
                                intr->flags |= INTR_FLAG_MSI_ENABLED;
                                intr->number_of_vectors = 1;
                                intr->using_vectors = true;
                                intr->vector_list[0].irq =
                                        adapter->pdev->irq;
                                netif_info(adapter, ifup, adapter->netdev,
                                           "using MSI interrupts, number of vectors = %d\n",
                                           intr->number_of_vectors);
                        }
                }
        }

        /* If MSIX, and MSI failed, setup using legacy interrupt */
        if (!intr->number_of_vectors) {
                intr->number_of_vectors = 1;
                intr->using_vectors = false;
                intr->vector_list[0].irq = intr->irq;
                netif_info(adapter, ifup, adapter->netdev,
                           "using legacy interrupts\n");
        }

        /* At this point we must have at least one irq */
        lan743x_csr_write(adapter, INT_VEC_EN_CLR, 0xFFFFFFFF);

        /* map all interrupts to vector 0 */
        lan743x_csr_write(adapter, INT_VEC_MAP0, 0x00000000);
        lan743x_csr_write(adapter, INT_VEC_MAP1, 0x00000000);
        lan743x_csr_write(adapter, INT_VEC_MAP2, 0x00000000);
        flags = LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ |
                LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C |
                LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK |
                LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR;

        if (intr->using_vectors) {
                flags |= LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_CLEAR |
                         LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_SET;
        } else {
                flags |= LAN743X_VECTOR_FLAG_MASTER_ENABLE_CLEAR |
                         LAN743X_VECTOR_FLAG_MASTER_ENABLE_SET |
                         LAN743X_VECTOR_FLAG_IRQ_SHARED;
        }

        if (adapter->csr.flags & LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR) {
                flags &= ~LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ;
                flags &= ~LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C;
                flags &= ~LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR;
                flags &= ~LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK;
                flags |= LAN743X_VECTOR_FLAG_SOURCE_STATUS_R2C;
                flags |= LAN743X_VECTOR_FLAG_SOURCE_ENABLE_R2C;
        }

        init_waitqueue_head(&intr->software_isr_wq);

        ret = lan743x_intr_register_isr(adapter, 0, flags,
                                        INT_BIT_ALL_RX_ | INT_BIT_ALL_TX_ |
                                        INT_BIT_ALL_OTHER_,
                                        lan743x_intr_shared_isr, adapter);
        if (ret)
                goto clean_up;
        intr->flags |= INTR_FLAG_IRQ_REQUESTED(0);

        if (intr->using_vectors)
                lan743x_csr_write(adapter, INT_VEC_EN_SET,
                                  INT_VEC_EN_(0));

        if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0)) {
                lan743x_csr_write(adapter, INT_MOD_CFG0, LAN743X_INT_MOD);
                lan743x_csr_write(adapter, INT_MOD_CFG1, LAN743X_INT_MOD);
                lan743x_csr_write(adapter, INT_MOD_CFG2, LAN743X_INT_MOD);
                lan743x_csr_write(adapter, INT_MOD_CFG3, LAN743X_INT_MOD);
                lan743x_csr_write(adapter, INT_MOD_CFG4, LAN743X_INT_MOD);
                lan743x_csr_write(adapter, INT_MOD_CFG5, LAN743X_INT_MOD);
                lan743x_csr_write(adapter, INT_MOD_CFG6, LAN743X_INT_MOD);
                lan743x_csr_write(adapter, INT_MOD_CFG7, LAN743X_INT_MOD);
                lan743x_csr_write(adapter, INT_MOD_MAP0, 0x00005432);
                lan743x_csr_write(adapter, INT_MOD_MAP1, 0x00000001);
                lan743x_csr_write(adapter, INT_MOD_MAP2, 0x00FFFFFF);
        }

        /* enable interrupts */
        lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_MAS_);
        ret = lan743x_intr_test_isr(adapter);
        if (ret)
                goto clean_up;

        if (intr->number_of_vectors > 1) {
                int number_of_tx_vectors = intr->number_of_vectors - 1;

                if (number_of_tx_vectors > LAN743X_USED_TX_CHANNELS)
                        number_of_tx_vectors = LAN743X_USED_TX_CHANNELS;
                flags = LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ |
                        LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C |
                        LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK |
                        LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR |
                        LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_CLEAR |
                        LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_SET;

                if (adapter->csr.flags &
                   LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR) {
                        flags = LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET |
                                LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET |
                                LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_CLEAR |
                                LAN743X_VECTOR_FLAG_SOURCE_STATUS_AUTO_CLEAR;
                }

                for (index = 0; index < number_of_tx_vectors; index++) {
                        u32 int_bit = INT_BIT_DMA_TX_(index);
                        int vector = index + 1;

                        /* map TX interrupt to vector */
                        int_vec_map1 |= INT_VEC_MAP1_TX_VEC_(index, vector);
                        lan743x_csr_write(adapter, INT_VEC_MAP1, int_vec_map1);

                        /* Remove TX interrupt from shared mask */
                        intr->vector_list[0].int_mask &= ~int_bit;
                        ret = lan743x_intr_register_isr(adapter, vector, flags,
                                                        int_bit, lan743x_tx_isr,
                                                        &adapter->tx[index]);
                        if (ret)
                                goto clean_up;
                        intr->flags |= INTR_FLAG_IRQ_REQUESTED(vector);
                        if (!(flags &
                            LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET))
                                lan743x_csr_write(adapter, INT_VEC_EN_SET,
                                                  INT_VEC_EN_(vector));
                }
        }
        if ((intr->number_of_vectors - LAN743X_USED_TX_CHANNELS) > 1) {
                int number_of_rx_vectors = intr->number_of_vectors -
                                           LAN743X_USED_TX_CHANNELS - 1;

                if (number_of_rx_vectors > LAN743X_USED_RX_CHANNELS)
                        number_of_rx_vectors = LAN743X_USED_RX_CHANNELS;

                flags = LAN743X_VECTOR_FLAG_SOURCE_STATUS_READ |
                        LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C |
                        LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CHECK |
                        LAN743X_VECTOR_FLAG_SOURCE_ENABLE_CLEAR |
                        LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_CLEAR |
                        LAN743X_VECTOR_FLAG_VECTOR_ENABLE_ISR_SET;

                if (adapter->csr.flags &
                    LAN743X_CSR_FLAG_SUPPORTS_INTR_AUTO_SET_CLR) {
                        flags = LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_CLEAR |
                                LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET |
                                LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET |
                                LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_CLEAR |
                                LAN743X_VECTOR_FLAG_SOURCE_STATUS_AUTO_CLEAR;
                }
                for (index = 0; index < number_of_rx_vectors; index++) {
                        int vector = index + 1 + LAN743X_USED_TX_CHANNELS;
                        u32 int_bit = INT_BIT_DMA_RX_(index);

                        /* map RX interrupt to vector */
                        int_vec_map0 |= INT_VEC_MAP0_RX_VEC_(index, vector);
                        lan743x_csr_write(adapter, INT_VEC_MAP0, int_vec_map0);
                        if (flags &
                            LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_CLEAR) {
                                int_vec_en_auto_clr |= INT_VEC_EN_(vector);
                                lan743x_csr_write(adapter, INT_VEC_EN_AUTO_CLR,
                                                  int_vec_en_auto_clr);
                        }

                        /* Remove RX interrupt from shared mask */
                        intr->vector_list[0].int_mask &= ~int_bit;
                        ret = lan743x_intr_register_isr(adapter, vector, flags,
                                                        int_bit, lan743x_rx_isr,
                                                        &adapter->rx[index]);
                        if (ret)
                                goto clean_up;
                        intr->flags |= INTR_FLAG_IRQ_REQUESTED(vector);

                        lan743x_csr_write(adapter, INT_VEC_EN_SET,
                                          INT_VEC_EN_(vector));
                }
        }
        return 0;

clean_up:
        lan743x_intr_close(adapter);
        return ret;
}

static int lan743x_dp_write(struct lan743x_adapter *adapter,
                            u32 select, u32 addr, u32 length, u32 *buf)
{
        u32 dp_sel;
        int i;

        if (lan743x_csr_wait_for_bit(adapter, DP_SEL, DP_SEL_DPRDY_,
                                     1, 40, 100, 100))
                return -EIO;
        dp_sel = lan743x_csr_read(adapter, DP_SEL);
        dp_sel &= ~DP_SEL_MASK_;
        dp_sel |= select;
        lan743x_csr_write(adapter, DP_SEL, dp_sel);

        for (i = 0; i < length; i++) {
                lan743x_csr_write(adapter, DP_ADDR, addr + i);
                lan743x_csr_write(adapter, DP_DATA_0, buf[i]);
                lan743x_csr_write(adapter, DP_CMD, DP_CMD_WRITE_);
                if (lan743x_csr_wait_for_bit(adapter, DP_SEL, DP_SEL_DPRDY_,
                                             1, 40, 100, 100))
                        return -EIO;
        }

        return 0;
}

static u32 lan743x_mac_mii_access(u16 id, u16 index, int read)
{
        u32 ret;

        ret = (id << MAC_MII_ACC_PHY_ADDR_SHIFT_) &
                MAC_MII_ACC_PHY_ADDR_MASK_;
        ret |= (index << MAC_MII_ACC_MIIRINDA_SHIFT_) &
                MAC_MII_ACC_MIIRINDA_MASK_;

        if (read)
                ret |= MAC_MII_ACC_MII_READ_;
        else
                ret |= MAC_MII_ACC_MII_WRITE_;
        ret |= MAC_MII_ACC_MII_BUSY_;

        return ret;
}

static int lan743x_mac_mii_wait_till_not_busy(struct lan743x_adapter *adapter)
{
        u32 data;

        return readx_poll_timeout(LAN743X_CSR_READ_OP, MAC_MII_ACC, data,
                                  !(data & MAC_MII_ACC_MII_BUSY_), 0, 1000000);
}

static int lan743x_mdiobus_read(struct mii_bus *bus, int phy_id, int index)
{
        struct lan743x_adapter *adapter = bus->priv;
        u32 val, mii_access;
        int ret;

        /* comfirm MII not busy */
        ret = lan743x_mac_mii_wait_till_not_busy(adapter);
        if (ret < 0)
                return ret;

        /* set the address, index & direction (read from PHY) */
        mii_access = lan743x_mac_mii_access(phy_id, index, MAC_MII_READ);
        lan743x_csr_write(adapter, MAC_MII_ACC, mii_access);
        ret = lan743x_mac_mii_wait_till_not_busy(adapter);
        if (ret < 0)
                return ret;

        val = lan743x_csr_read(adapter, MAC_MII_DATA);
        return (int)(val & 0xFFFF);
}

static int lan743x_mdiobus_write(struct mii_bus *bus,
                                 int phy_id, int index, u16 regval)
{
        struct lan743x_adapter *adapter = bus->priv;
        u32 val, mii_access;
        int ret;

        /* confirm MII not busy */
        ret = lan743x_mac_mii_wait_till_not_busy(adapter);
        if (ret < 0)
                return ret;
        val = (u32)regval;
        lan743x_csr_write(adapter, MAC_MII_DATA, val);

        /* set the address, index & direction (write to PHY) */
        mii_access = lan743x_mac_mii_access(phy_id, index, MAC_MII_WRITE);
        lan743x_csr_write(adapter, MAC_MII_ACC, mii_access);
        ret = lan743x_mac_mii_wait_till_not_busy(adapter);
        return ret;
}

static void lan743x_mac_set_address(struct lan743x_adapter *adapter,
                                    u8 *addr)
{
        u32 addr_lo, addr_hi;

        addr_lo = addr[0] |
                addr[1] << 8 |
                addr[2] << 16 |
                addr[3] << 24;
        addr_hi = addr[4] |
                addr[5] << 8;
        lan743x_csr_write(adapter, MAC_RX_ADDRL, addr_lo);
        lan743x_csr_write(adapter, MAC_RX_ADDRH, addr_hi);

        ether_addr_copy(adapter->mac_address, addr);
        netif_info(adapter, drv, adapter->netdev,
                   "MAC address set to %pM\n", addr);
}

static int lan743x_mac_init(struct lan743x_adapter *adapter)
{
        bool mac_address_valid = true;
        struct net_device *netdev;
        u32 mac_addr_hi = 0;
        u32 mac_addr_lo = 0;
        u32 data;

        netdev = adapter->netdev;

        /* disable auto duplex, and speed detection. Phylib does that */
        data = lan743x_csr_read(adapter, MAC_CR);
        data &= ~(MAC_CR_ADD_ | MAC_CR_ASD_);
        data |= MAC_CR_CNTR_RST_;
        lan743x_csr_write(adapter, MAC_CR, data);

        if (!is_valid_ether_addr(adapter->mac_address)) {
                mac_addr_hi = lan743x_csr_read(adapter, MAC_RX_ADDRH);
                mac_addr_lo = lan743x_csr_read(adapter, MAC_RX_ADDRL);
                adapter->mac_address[0] = mac_addr_lo & 0xFF;
                adapter->mac_address[1] = (mac_addr_lo >> 8) & 0xFF;
                adapter->mac_address[2] = (mac_addr_lo >> 16) & 0xFF;
                adapter->mac_address[3] = (mac_addr_lo >> 24) & 0xFF;
                adapter->mac_address[4] = mac_addr_hi & 0xFF;
                adapter->mac_address[5] = (mac_addr_hi >> 8) & 0xFF;

                if (((mac_addr_hi & 0x0000FFFF) == 0x0000FFFF) &&
                    mac_addr_lo == 0xFFFFFFFF) {
                        mac_address_valid = false;
                } else if (!is_valid_ether_addr(adapter->mac_address)) {
                        mac_address_valid = false;
                }

                if (!mac_address_valid)
                        eth_random_addr(adapter->mac_address);
        }
        lan743x_mac_set_address(adapter, adapter->mac_address);
        ether_addr_copy(netdev->dev_addr, adapter->mac_address);

        return 0;
}

static int lan743x_mac_open(struct lan743x_adapter *adapter)
{
        u32 temp;

        temp = lan743x_csr_read(adapter, MAC_RX);
        lan743x_csr_write(adapter, MAC_RX, temp | MAC_RX_RXEN_);
        temp = lan743x_csr_read(adapter, MAC_TX);
        lan743x_csr_write(adapter, MAC_TX, temp | MAC_TX_TXEN_);
        return 0;
}

static void lan743x_mac_close(struct lan743x_adapter *adapter)
{
        u32 temp;

        temp = lan743x_csr_read(adapter, MAC_TX);
        temp &= ~MAC_TX_TXEN_;
        lan743x_csr_write(adapter, MAC_TX, temp);
        lan743x_csr_wait_for_bit(adapter, MAC_TX, MAC_TX_TXD_,
                                 1, 1000, 20000, 100);

        temp = lan743x_csr_read(adapter, MAC_RX);
        temp &= ~MAC_RX_RXEN_;
        lan743x_csr_write(adapter, MAC_RX, temp);
        lan743x_csr_wait_for_bit(adapter, MAC_RX, MAC_RX_RXD_,
                                 1, 1000, 20000, 100);
}

static void lan743x_mac_flow_ctrl_set_enables(struct lan743x_adapter *adapter,
                                              bool tx_enable, bool rx_enable)
{
        u32 flow_setting = 0;

        /* set maximum pause time because when fifo space frees
         * up a zero value pause frame will be sent to release the pause
         */
        flow_setting = MAC_FLOW_CR_FCPT_MASK_;
        if (tx_enable)
                flow_setting |= MAC_FLOW_CR_TX_FCEN_;
        if (rx_enable)
                flow_setting |= MAC_FLOW_CR_RX_FCEN_;
        lan743x_csr_write(adapter, MAC_FLOW, flow_setting);
}

static int lan743x_mac_set_mtu(struct lan743x_adapter *adapter, int new_mtu)
{
        int enabled = 0;
        u32 mac_rx = 0;

        mac_rx = lan743x_csr_read(adapter, MAC_RX);
        if (mac_rx & MAC_RX_RXEN_) {
                enabled = 1;
                if (mac_rx & MAC_RX_RXD_) {
                        lan743x_csr_write(adapter, MAC_RX, mac_rx);
                        mac_rx &= ~MAC_RX_RXD_;
                }
                mac_rx &= ~MAC_RX_RXEN_;
                lan743x_csr_write(adapter, MAC_RX, mac_rx);
                lan743x_csr_wait_for_bit(adapter, MAC_RX, MAC_RX_RXD_,
                                         1, 1000, 20000, 100);
                lan743x_csr_write(adapter, MAC_RX, mac_rx | MAC_RX_RXD_);
        }

        mac_rx &= ~(MAC_RX_MAX_SIZE_MASK_);
        mac_rx |= (((new_mtu + ETH_HLEN + ETH_FCS_LEN)
                  << MAC_RX_MAX_SIZE_SHIFT_) & MAC_RX_MAX_SIZE_MASK_);
        lan743x_csr_write(adapter, MAC_RX, mac_rx);

        if (enabled) {
                mac_rx |= MAC_RX_RXEN_;
                lan743x_csr_write(adapter, MAC_RX, mac_rx);
        }
        return 0;
}

/* PHY */
static int lan743x_phy_reset(struct lan743x_adapter *adapter)
{
        u32 data;

        /* Only called with in probe, and before mdiobus_register */

        data = lan743x_csr_read(adapter, PMT_CTL);
        data |= PMT_CTL_ETH_PHY_RST_;
        lan743x_csr_write(adapter, PMT_CTL, data);

        return readx_poll_timeout(LAN743X_CSR_READ_OP, PMT_CTL, data,
                                  (!(data & PMT_CTL_ETH_PHY_RST_) &&
                                  (data & PMT_CTL_READY_)),
                                  50000, 1000000);
}

static void lan743x_phy_update_flowcontrol(struct lan743x_adapter *adapter,
                                           u8 duplex, u16 local_adv,
                                           u16 remote_adv)
{
        struct lan743x_phy *phy = &adapter->phy;
        u8 cap;

        if (phy->fc_autoneg)
                cap = mii_resolve_flowctrl_fdx(local_adv, remote_adv);
        else
                cap = phy->fc_request_control;

        lan743x_mac_flow_ctrl_set_enables(adapter,
                                          cap & FLOW_CTRL_TX,
                                          cap & FLOW_CTRL_RX);
}

static int lan743x_phy_init(struct lan743x_adapter *adapter)
{
        return lan743x_phy_reset(adapter);
}

static void lan743x_phy_link_status_change(struct net_device *netdev)
{
        struct lan743x_adapter *adapter = netdev_priv(netdev);
        struct phy_device *phydev = netdev->phydev;
        u32 data;

        phy_print_status(phydev);
        if (phydev->state == PHY_RUNNING) {
                struct ethtool_link_ksettings ksettings;
                int remote_advertisement = 0;
                int local_advertisement = 0;

                data = lan743x_csr_read(adapter, MAC_CR);

                /* set interface mode */
                if (phy_interface_is_rgmii(phydev))
                        /* RGMII */
                        data &= ~MAC_CR_MII_EN_;
                else
                        /* GMII */
                        data |= MAC_CR_MII_EN_;

                /* set duplex mode */
                if (phydev->duplex)
                        data |= MAC_CR_DPX_;
                else
                        data &= ~MAC_CR_DPX_;

                /* set bus speed */
                switch (phydev->speed) {
                case SPEED_10:
                        data &= ~MAC_CR_CFG_H_;
                        data &= ~MAC_CR_CFG_L_;
                break;
                case SPEED_100:
                        data &= ~MAC_CR_CFG_H_;
                        data |= MAC_CR_CFG_L_;
                break;
                case SPEED_1000:
                        data |= MAC_CR_CFG_H_;
                        data &= ~MAC_CR_CFG_L_;
                break;
                }
                lan743x_csr_write(adapter, MAC_CR, data);

                memset(&ksettings, 0, sizeof(ksettings));
                phy_ethtool_get_link_ksettings(netdev, &ksettings);
                local_advertisement =
                        linkmode_adv_to_mii_adv_t(phydev->advertising);
                remote_advertisement =
                        linkmode_adv_to_mii_adv_t(phydev->lp_advertising);

                lan743x_phy_update_flowcontrol(adapter,
                                               ksettings.base.duplex,
                                               local_advertisement,
                                               remote_advertisement);
                lan743x_ptp_update_latency(adapter, ksettings.base.speed);
        }
}

static void lan743x_phy_close(struct lan743x_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        phy_stop(netdev->phydev);
        phy_disconnect(netdev->phydev);
        netdev->phydev = NULL;
}

static int lan743x_phy_open(struct lan743x_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct lan743x_phy *phy = &adapter->phy;
        struct phy_device *phydev;
        int ret = -EIO;

        /* try devicetree phy, or fixed link */
        phydev = of_phy_get_and_connect(netdev, adapter->pdev->dev.of_node,
                                        lan743x_phy_link_status_change);

        if (!phydev) {
                /* try internal phy */
                phydev = phy_find_first(adapter->mdiobus);
                if (!phydev)
                        goto return_error;

                ret = phy_connect_direct(netdev, phydev,
                                         lan743x_phy_link_status_change,
                                         PHY_INTERFACE_MODE_GMII);
                if (ret)
                        goto return_error;
        }

        /* MAC doesn't support 1000T Half */
        phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);

        /* support both flow controls */
        phy_support_asym_pause(phydev);
        phy->fc_request_control = (FLOW_CTRL_RX | FLOW_CTRL_TX);
        phy->fc_autoneg = phydev->autoneg;

        phy_start(phydev);
        phy_start_aneg(phydev);
        phy_attached_info(phydev);
        return 0;

return_error:
        return ret;
}

static void lan743x_rfe_open(struct lan743x_adapter *adapter)
{
        lan743x_csr_write(adapter, RFE_RSS_CFG,
                RFE_RSS_CFG_UDP_IPV6_EX_ |
                RFE_RSS_CFG_TCP_IPV6_EX_ |
                RFE_RSS_CFG_IPV6_EX_ |
                RFE_RSS_CFG_UDP_IPV6_ |
                RFE_RSS_CFG_TCP_IPV6_ |
                RFE_RSS_CFG_IPV6_ |
                RFE_RSS_CFG_UDP_IPV4_ |
                RFE_RSS_CFG_TCP_IPV4_ |
                RFE_RSS_CFG_IPV4_ |
                RFE_RSS_CFG_VALID_HASH_BITS_ |
                RFE_RSS_CFG_RSS_QUEUE_ENABLE_ |
                RFE_RSS_CFG_RSS_HASH_STORE_ |
                RFE_RSS_CFG_RSS_ENABLE_);
}

static void lan743x_rfe_update_mac_address(struct lan743x_adapter *adapter)
{
        u8 *mac_addr;
        u32 mac_addr_hi = 0;
        u32 mac_addr_lo = 0;

        /* Add mac address to perfect Filter */
        mac_addr = adapter->mac_address;
        mac_addr_lo = ((((u32)(mac_addr[0])) << 0) |
                      (((u32)(mac_addr[1])) << 8) |
                      (((u32)(mac_addr[2])) << 16) |
                      (((u32)(mac_addr[3])) << 24));
        mac_addr_hi = ((((u32)(mac_addr[4])) << 0) |
                      (((u32)(mac_addr[5])) << 8));

        lan743x_csr_write(adapter, RFE_ADDR_FILT_LO(0), mac_addr_lo);
        lan743x_csr_write(adapter, RFE_ADDR_FILT_HI(0),
                          mac_addr_hi | RFE_ADDR_FILT_HI_VALID_);
}

static void lan743x_rfe_set_multicast(struct lan743x_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        u32 hash_table[DP_SEL_VHF_HASH_LEN];
        u32 rfctl;
        u32 data;

        rfctl = lan743x_csr_read(adapter, RFE_CTL);
        rfctl &= ~(RFE_CTL_AU_ | RFE_CTL_AM_ |
                 RFE_CTL_DA_PERFECT_ | RFE_CTL_MCAST_HASH_);
        rfctl |= RFE_CTL_AB_;
        if (netdev->flags & IFF_PROMISC) {
                rfctl |= RFE_CTL_AM_ | RFE_CTL_AU_;
        } else {
                if (netdev->flags & IFF_ALLMULTI)
                        rfctl |= RFE_CTL_AM_;
        }

        memset(hash_table, 0, DP_SEL_VHF_HASH_LEN * sizeof(u32));
        if (netdev_mc_count(netdev)) {
                struct netdev_hw_addr *ha;
                int i;

                rfctl |= RFE_CTL_DA_PERFECT_;
                i = 1;
                netdev_for_each_mc_addr(ha, netdev) {
                        /* set first 32 into Perfect Filter */
                        if (i < 33) {
                                lan743x_csr_write(adapter,
                                                  RFE_ADDR_FILT_HI(i), 0);
                                data = ha->addr[3];
                                data = ha->addr[2] | (data << 8);
                                data = ha->addr[1] | (data << 8);
                                data = ha->addr[0] | (data << 8);
                                lan743x_csr_write(adapter,
                                                  RFE_ADDR_FILT_LO(i), data);
                                data = ha->addr[5];
                                data = ha->addr[4] | (data << 8);
                                data |= RFE_ADDR_FILT_HI_VALID_;
                                lan743x_csr_write(adapter,
                                                  RFE_ADDR_FILT_HI(i), data);
                        } else {
                                u32 bitnum = (ether_crc(ETH_ALEN, ha->addr) >>
                                             23) & 0x1FF;
                                hash_table[bitnum / 32] |= (1 << (bitnum % 32));
                                rfctl |= RFE_CTL_MCAST_HASH_;
                        }
                        i++;
                }
        }

        lan743x_dp_write(adapter, DP_SEL_RFE_RAM,
                         DP_SEL_VHF_VLAN_LEN,
                         DP_SEL_VHF_HASH_LEN, hash_table);
        lan743x_csr_write(adapter, RFE_CTL, rfctl);
}

static int lan743x_dmac_init(struct lan743x_adapter *adapter)
{
        u32 data = 0;

        lan743x_csr_write(adapter, DMAC_CMD, DMAC_CMD_SWR_);
        lan743x_csr_wait_for_bit(adapter, DMAC_CMD, DMAC_CMD_SWR_,
                                 0, 1000, 20000, 100);
        switch (DEFAULT_DMA_DESCRIPTOR_SPACING) {
        case DMA_DESCRIPTOR_SPACING_16:
                data = DMAC_CFG_MAX_DSPACE_16_;
                break;
        case DMA_DESCRIPTOR_SPACING_32:
                data = DMAC_CFG_MAX_DSPACE_32_;
                break;
        case DMA_DESCRIPTOR_SPACING_64:
                data = DMAC_CFG_MAX_DSPACE_64_;
                break;
        case DMA_DESCRIPTOR_SPACING_128:
                data = DMAC_CFG_MAX_DSPACE_128_;
                break;
        default:
                return -EPERM;
        }
        if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0))
                data |= DMAC_CFG_COAL_EN_;
        data |= DMAC_CFG_CH_ARB_SEL_RX_HIGH_;
        data |= DMAC_CFG_MAX_READ_REQ_SET_(6);
        lan743x_csr_write(adapter, DMAC_CFG, data);
        data = DMAC_COAL_CFG_TIMER_LIMIT_SET_(1);
        data |= DMAC_COAL_CFG_TIMER_TX_START_;
        data |= DMAC_COAL_CFG_FLUSH_INTS_;
        data |= DMAC_COAL_CFG_INT_EXIT_COAL_;
        data |= DMAC_COAL_CFG_CSR_EXIT_COAL_;
        data |= DMAC_COAL_CFG_TX_THRES_SET_(0x0A);
        data |= DMAC_COAL_CFG_RX_THRES_SET_(0x0C);
        lan743x_csr_write(adapter, DMAC_COAL_CFG, data);
        data = DMAC_OBFF_TX_THRES_SET_(0x08);
        data |= DMAC_OBFF_RX_THRES_SET_(0x0A);
        lan743x_csr_write(adapter, DMAC_OBFF_CFG, data);
        return 0;
}

static int lan743x_dmac_tx_get_state(struct lan743x_adapter *adapter,
                                     int tx_channel)
{
        u32 dmac_cmd = 0;

        dmac_cmd = lan743x_csr_read(adapter, DMAC_CMD);
        return DMAC_CHANNEL_STATE_SET((dmac_cmd &
                                      DMAC_CMD_START_T_(tx_channel)),
                                      (dmac_cmd &
                                      DMAC_CMD_STOP_T_(tx_channel)));
}

static int lan743x_dmac_tx_wait_till_stopped(struct lan743x_adapter *adapter,
                                             int tx_channel)
{
        int timeout = 100;
        int result = 0;

        while (timeout &&
               ((result = lan743x_dmac_tx_get_state(adapter, tx_channel)) ==
               DMAC_CHANNEL_STATE_STOP_PENDING)) {
                usleep_range(1000, 20000);
                timeout--;
        }
        if (result == DMAC_CHANNEL_STATE_STOP_PENDING)
                result = -ENODEV;
        return result;
}

static int lan743x_dmac_rx_get_state(struct lan743x_adapter *adapter,
                                     int rx_channel)
{
        u32 dmac_cmd = 0;

        dmac_cmd = lan743x_csr_read(adapter, DMAC_CMD);
        return DMAC_CHANNEL_STATE_SET((dmac_cmd &
                                      DMAC_CMD_START_R_(rx_channel)),
                                      (dmac_cmd &
                                      DMAC_CMD_STOP_R_(rx_channel)));
}

static int lan743x_dmac_rx_wait_till_stopped(struct lan743x_adapter *adapter,
                                             int rx_channel)
{
        int timeout = 100;
        int result = 0;

        while (timeout &&
               ((result = lan743x_dmac_rx_get_state(adapter, rx_channel)) ==
               DMAC_CHANNEL_STATE_STOP_PENDING)) {
                usleep_range(1000, 20000);
                timeout--;
        }
        if (result == DMAC_CHANNEL_STATE_STOP_PENDING)
                result = -ENODEV;
        return result;
}

static void lan743x_tx_release_desc(struct lan743x_tx *tx,
                                    int descriptor_index, bool cleanup)
{
        struct lan743x_tx_buffer_info *buffer_info = NULL;
        struct lan743x_tx_descriptor *descriptor = NULL;
        u32 descriptor_type = 0;
        bool ignore_sync;

        descriptor = &tx->ring_cpu_ptr[descriptor_index];
        buffer_info = &tx->buffer_info[descriptor_index];
        if (!(buffer_info->flags & TX_BUFFER_INFO_FLAG_ACTIVE))
                goto done;

        descriptor_type = le32_to_cpu(descriptor->data0) &
                          TX_DESC_DATA0_DTYPE_MASK_;
        if (descriptor_type == TX_DESC_DATA0_DTYPE_DATA_)
                goto clean_up_data_descriptor;
        else
                goto clear_active;

clean_up_data_descriptor:
        if (buffer_info->dma_ptr) {
                if (buffer_info->flags &
                    TX_BUFFER_INFO_FLAG_SKB_FRAGMENT) {
                        dma_unmap_page(&tx->adapter->pdev->dev,
                                       buffer_info->dma_ptr,
                                       buffer_info->buffer_length,
                                       DMA_TO_DEVICE);
                } else {
                        dma_unmap_single(&tx->adapter->pdev->dev,
                                         buffer_info->dma_ptr,
                                         buffer_info->buffer_length,
                                         DMA_TO_DEVICE);
                }
                buffer_info->dma_ptr = 0;
                buffer_info->buffer_length = 0;
        }
        if (!buffer_info->skb)
                goto clear_active;

        if (!(buffer_info->flags & TX_BUFFER_INFO_FLAG_TIMESTAMP_REQUESTED)) {
                dev_kfree_skb_any(buffer_info->skb);
                goto clear_skb;
        }

        if (cleanup) {
                lan743x_ptp_unrequest_tx_timestamp(tx->adapter);
                dev_kfree_skb_any(buffer_info->skb);
        } else {
                ignore_sync = (buffer_info->flags &
                               TX_BUFFER_INFO_FLAG_IGNORE_SYNC) != 0;
                lan743x_ptp_tx_timestamp_skb(tx->adapter,
                                             buffer_info->skb, ignore_sync);
        }

clear_skb:
        buffer_info->skb = NULL;

clear_active:
        buffer_info->flags &= ~TX_BUFFER_INFO_FLAG_ACTIVE;

done:
        memset(buffer_info, 0, sizeof(*buffer_info));
        memset(descriptor, 0, sizeof(*descriptor));
}

static int lan743x_tx_next_index(struct lan743x_tx *tx, int index)
{
        return ((++index) % tx->ring_size);
}

static void lan743x_tx_release_completed_descriptors(struct lan743x_tx *tx)
{
        while (le32_to_cpu(*tx->head_cpu_ptr) != (tx->last_head)) {
                lan743x_tx_release_desc(tx, tx->last_head, false);
                tx->last_head = lan743x_tx_next_index(tx, tx->last_head);
        }
}

static void lan743x_tx_release_all_descriptors(struct lan743x_tx *tx)
{
        u32 original_head = 0;

        original_head = tx->last_head;
        do {
                lan743x_tx_release_desc(tx, tx->last_head, true);
                tx->last_head = lan743x_tx_next_index(tx, tx->last_head);
        } while (tx->last_head != original_head);
        memset(tx->ring_cpu_ptr, 0,
               sizeof(*tx->ring_cpu_ptr) * (tx->ring_size));
        memset(tx->buffer_info, 0,
               sizeof(*tx->buffer_info) * (tx->ring_size));
}

static int lan743x_tx_get_desc_cnt(struct lan743x_tx *tx,
                                   struct sk_buff *skb)
{
        int result = 1; /* 1 for the main skb buffer */
        int nr_frags = 0;

        if (skb_is_gso(skb))
                result++; /* requires an extension descriptor */
        nr_frags = skb_shinfo(skb)->nr_frags;
        result += nr_frags; /* 1 for each fragment buffer */
        return result;
}

static int lan743x_tx_get_avail_desc(struct lan743x_tx *tx)
{
        int last_head = tx->last_head;
        int last_tail = tx->last_tail;

        if (last_tail >= last_head)
                return tx->ring_size - last_tail + last_head - 1;
        else
                return last_head - last_tail - 1;
}

void lan743x_tx_set_timestamping_mode(struct lan743x_tx *tx,
                                      bool enable_timestamping,
                                      bool enable_onestep_sync)
{
        if (enable_timestamping)
                tx->ts_flags |= TX_TS_FLAG_TIMESTAMPING_ENABLED;
        else
                tx->ts_flags &= ~TX_TS_FLAG_TIMESTAMPING_ENABLED;
        if (enable_onestep_sync)
                tx->ts_flags |= TX_TS_FLAG_ONE_STEP_SYNC;
        else
                tx->ts_flags &= ~TX_TS_FLAG_ONE_STEP_SYNC;
}

static int lan743x_tx_frame_start(struct lan743x_tx *tx,
                                  unsigned char *first_buffer,
                                  unsigned int first_buffer_length,
                                  unsigned int frame_length,
                                  bool time_stamp,
                                  bool check_sum)
{
        /* called only from within lan743x_tx_xmit_frame.
         * assuming tx->ring_lock has already been acquired.
         */
        struct lan743x_tx_descriptor *tx_descriptor = NULL;
        struct lan743x_tx_buffer_info *buffer_info = NULL;
        struct lan743x_adapter *adapter = tx->adapter;
        struct device *dev = &adapter->pdev->dev;
        dma_addr_t dma_ptr;

        tx->frame_flags |= TX_FRAME_FLAG_IN_PROGRESS;
        tx->frame_first = tx->last_tail;
        tx->frame_tail = tx->frame_first;

        tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
        buffer_info = &tx->buffer_info[tx->frame_tail];
        dma_ptr = dma_map_single(dev, first_buffer, first_buffer_length,
                                 DMA_TO_DEVICE);
        if (dma_mapping_error(dev, dma_ptr))
                return -ENOMEM;

        tx_descriptor->data1 = cpu_to_le32(DMA_ADDR_LOW32(dma_ptr));
        tx_descriptor->data2 = cpu_to_le32(DMA_ADDR_HIGH32(dma_ptr));
        tx_descriptor->data3 = cpu_to_le32((frame_length << 16) &
                TX_DESC_DATA3_FRAME_LENGTH_MSS_MASK_);

        buffer_info->skb = NULL;
        buffer_info->dma_ptr = dma_ptr;
        buffer_info->buffer_length = first_buffer_length;
        buffer_info->flags |= TX_BUFFER_INFO_FLAG_ACTIVE;

        tx->frame_data0 = (first_buffer_length &
                TX_DESC_DATA0_BUF_LENGTH_MASK_) |
                TX_DESC_DATA0_DTYPE_DATA_ |
                TX_DESC_DATA0_FS_ |
                TX_DESC_DATA0_FCS_;
        if (time_stamp)
                tx->frame_data0 |= TX_DESC_DATA0_TSE_;

        if (check_sum)
                tx->frame_data0 |= TX_DESC_DATA0_ICE_ |
                                   TX_DESC_DATA0_IPE_ |
                                   TX_DESC_DATA0_TPE_;

        /* data0 will be programmed in one of other frame assembler functions */
        return 0;
}

static void lan743x_tx_frame_add_lso(struct lan743x_tx *tx,
                                     unsigned int frame_length,
                                     int nr_frags)
{
        /* called only from within lan743x_tx_xmit_frame.
         * assuming tx->ring_lock has already been acquired.
         */
        struct lan743x_tx_descriptor *tx_descriptor = NULL;
        struct lan743x_tx_buffer_info *buffer_info = NULL;

        /* wrap up previous descriptor */
        tx->frame_data0 |= TX_DESC_DATA0_EXT_;
        if (nr_frags <= 0) {
                tx->frame_data0 |= TX_DESC_DATA0_LS_;
                tx->frame_data0 |= TX_DESC_DATA0_IOC_;
        }
        tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
        tx_descriptor->data0 = cpu_to_le32(tx->frame_data0);

        /* move to next descriptor */
        tx->frame_tail = lan743x_tx_next_index(tx, tx->frame_tail);
        tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
        buffer_info = &tx->buffer_info[tx->frame_tail];

        /* add extension descriptor */
        tx_descriptor->data1 = 0;
        tx_descriptor->data2 = 0;
        tx_descriptor->data3 = 0;

        buffer_info->skb = NULL;
        buffer_info->dma_ptr = 0;
        buffer_info->buffer_length = 0;
        buffer_info->flags |= TX_BUFFER_INFO_FLAG_ACTIVE;

        tx->frame_data0 = (frame_length & TX_DESC_DATA0_EXT_PAY_LENGTH_MASK_) |
                          TX_DESC_DATA0_DTYPE_EXT_ |
                          TX_DESC_DATA0_EXT_LSO_;

        /* data0 will be programmed in one of other frame assembler functions */
}

static int lan743x_tx_frame_add_fragment(struct lan743x_tx *tx,
                                         const skb_frag_t *fragment,
                                         unsigned int frame_length)
{
        /* called only from within lan743x_tx_xmit_frame
         * assuming tx->ring_lock has already been acquired
         */
        struct lan743x_tx_descriptor *tx_descriptor = NULL;
        struct lan743x_tx_buffer_info *buffer_info = NULL;
        struct lan743x_adapter *adapter = tx->adapter;
        struct device *dev = &adapter->pdev->dev;
        unsigned int fragment_length = 0;
        dma_addr_t dma_ptr;

        fragment_length = skb_frag_size(fragment);
        if (!fragment_length)
                return 0;

        /* wrap up previous descriptor */
        tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
        tx_descriptor->data0 = cpu_to_le32(tx->frame_data0);

        /* move to next descriptor */
        tx->frame_tail = lan743x_tx_next_index(tx, tx->frame_tail);
        tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
        buffer_info = &tx->buffer_info[tx->frame_tail];
        dma_ptr = skb_frag_dma_map(dev, fragment,
                                   0, fragment_length,
                                   DMA_TO_DEVICE);
        if (dma_mapping_error(dev, dma_ptr)) {
                int desc_index;

                /* cleanup all previously setup descriptors */
                desc_index = tx->frame_first;
                while (desc_index != tx->frame_tail) {
                        lan743x_tx_release_desc(tx, desc_index, true);
                        desc_index = lan743x_tx_next_index(tx, desc_index);
                }
                dma_wmb();
                tx->frame_flags &= ~TX_FRAME_FLAG_IN_PROGRESS;
                tx->frame_first = 0;
                tx->frame_data0 = 0;
                tx->frame_tail = 0;
                return -ENOMEM;
        }

        tx_descriptor->data1 = cpu_to_le32(DMA_ADDR_LOW32(dma_ptr));
        tx_descriptor->data2 = cpu_to_le32(DMA_ADDR_HIGH32(dma_ptr));
        tx_descriptor->data3 = cpu_to_le32((frame_length << 16) &
                               TX_DESC_DATA3_FRAME_LENGTH_MSS_MASK_);

        buffer_info->skb = NULL;
        buffer_info->dma_ptr = dma_ptr;
        buffer_info->buffer_length = fragment_length;
        buffer_info->flags |= TX_BUFFER_INFO_FLAG_ACTIVE;
        buffer_info->flags |= TX_BUFFER_INFO_FLAG_SKB_FRAGMENT;

        tx->frame_data0 = (fragment_length & TX_DESC_DATA0_BUF_LENGTH_MASK_) |
                          TX_DESC_DATA0_DTYPE_DATA_ |
                          TX_DESC_DATA0_FCS_;

        /* data0 will be programmed in one of other frame assembler functions */
        return 0;
}

static void lan743x_tx_frame_end(struct lan743x_tx *tx,
                                 struct sk_buff *skb,
                                 bool time_stamp,
                                 bool ignore_sync)
{
        /* called only from within lan743x_tx_xmit_frame
         * assuming tx->ring_lock has already been acquired
         */
        struct lan743x_tx_descriptor *tx_descriptor = NULL;
        struct lan743x_tx_buffer_info *buffer_info = NULL;
        struct lan743x_adapter *adapter = tx->adapter;
        u32 tx_tail_flags = 0;

        /* wrap up previous descriptor */
        if ((tx->frame_data0 & TX_DESC_DATA0_DTYPE_MASK_) ==
            TX_DESC_DATA0_DTYPE_DATA_) {
                tx->frame_data0 |= TX_DESC_DATA0_LS_;
                tx->frame_data0 |= TX_DESC_DATA0_IOC_;
        }

        tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
        buffer_info = &tx->buffer_info[tx->frame_tail];
        buffer_info->skb = skb;
        if (time_stamp)
                buffer_info->flags |= TX_BUFFER_INFO_FLAG_TIMESTAMP_REQUESTED;
        if (ignore_sync)
                buffer_info->flags |= TX_BUFFER_INFO_FLAG_IGNORE_SYNC;

        tx_descriptor->data0 = cpu_to_le32(tx->frame_data0);
        tx->frame_tail = lan743x_tx_next_index(tx, tx->frame_tail);
        tx->last_tail = tx->frame_tail;

        dma_wmb();

        if (tx->vector_flags & LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET)
                tx_tail_flags |= TX_TAIL_SET_TOP_INT_VEC_EN_;
        if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET)
                tx_tail_flags |= TX_TAIL_SET_DMAC_INT_EN_ |
                TX_TAIL_SET_TOP_INT_EN_;

        lan743x_csr_write(adapter, TX_TAIL(tx->channel_number),
                          tx_tail_flags | tx->frame_tail);
        tx->frame_flags &= ~TX_FRAME_FLAG_IN_PROGRESS;
}

static netdev_tx_t lan743x_tx_xmit_frame(struct lan743x_tx *tx,
                                         struct sk_buff *skb)
{
        int required_number_of_descriptors = 0;
        unsigned int start_frame_length = 0;
        unsigned int frame_length = 0;
        unsigned int head_length = 0;
        unsigned long irq_flags = 0;
        bool do_timestamp = false;
        bool ignore_sync = false;
        int nr_frags = 0;
        bool gso = false;
        int j;

        required_number_of_descriptors = lan743x_tx_get_desc_cnt(tx, skb);

        spin_lock_irqsave(&tx->ring_lock, irq_flags);
        if (required_number_of_descriptors >
                lan743x_tx_get_avail_desc(tx)) {
                if (required_number_of_descriptors > (tx->ring_size - 1)) {
                        dev_kfree_skb_irq(skb);
                } else {
                        /* save to overflow buffer */
                        tx->overflow_skb = skb;
                        netif_stop_queue(tx->adapter->netdev);
                }
                goto unlock;
        }

        /* space available, transmit skb  */
        if ((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
            (tx->ts_flags & TX_TS_FLAG_TIMESTAMPING_ENABLED) &&
            (lan743x_ptp_request_tx_timestamp(tx->adapter))) {
                skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
                do_timestamp = true;
                if (tx->ts_flags & TX_TS_FLAG_ONE_STEP_SYNC)
                        ignore_sync = true;
        }
        head_length = skb_headlen(skb);
        frame_length = skb_pagelen(skb);
        nr_frags = skb_shinfo(skb)->nr_frags;
        start_frame_length = frame_length;
        gso = skb_is_gso(skb);
        if (gso) {
                start_frame_length = max(skb_shinfo(skb)->gso_size,
                                         (unsigned short)8);
        }

        if (lan743x_tx_frame_start(tx,
                                   skb->data, head_length,
                                   start_frame_length,
                                   do_timestamp,
                                   skb->ip_summed == CHECKSUM_PARTIAL)) {
                dev_kfree_skb_irq(skb);
                goto unlock;
        }

        if (gso)
                lan743x_tx_frame_add_lso(tx, frame_length, nr_frags);

        if (nr_frags <= 0)
                goto finish;

        for (j = 0; j < nr_frags; j++) {
                const skb_frag_t *frag = &(skb_shinfo(skb)->frags[j]);

                if (lan743x_tx_frame_add_fragment(tx, frag, frame_length)) {
                        /* upon error no need to call
                         *      lan743x_tx_frame_end
                         * frame assembler clean up was performed inside
                         *      lan743x_tx_frame_add_fragment
                         */
                        dev_kfree_skb_irq(skb);
                        goto unlock;
                }
        }

finish:
        lan743x_tx_frame_end(tx, skb, do_timestamp, ignore_sync);

unlock:
        spin_unlock_irqrestore(&tx->ring_lock, irq_flags);
        return NETDEV_TX_OK;
}

static int lan743x_tx_napi_poll(struct napi_struct *napi, int weight)
{
        struct lan743x_tx *tx = container_of(napi, struct lan743x_tx, napi);
        struct lan743x_adapter *adapter = tx->adapter;
        bool start_transmitter = false;
        unsigned long irq_flags = 0;
        u32 ioc_bit = 0;

        ioc_bit = DMAC_INT_BIT_TX_IOC_(tx->channel_number);
        lan743x_csr_read(adapter, DMAC_INT_STS);
        if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C)
                lan743x_csr_write(adapter, DMAC_INT_STS, ioc_bit);
        spin_lock_irqsave(&tx->ring_lock, irq_flags);

        /* clean up tx ring */
        lan743x_tx_release_completed_descriptors(tx);
        if (netif_queue_stopped(adapter->netdev)) {
                if (tx->overflow_skb) {
                        if (lan743x_tx_get_desc_cnt(tx, tx->overflow_skb) <=
                                lan743x_tx_get_avail_desc(tx))
                                start_transmitter = true;
                } else {
                        netif_wake_queue(adapter->netdev);
                }
        }
        spin_unlock_irqrestore(&tx->ring_lock, irq_flags);

        if (start_transmitter) {
                /* space is now available, transmit overflow skb */
                lan743x_tx_xmit_frame(tx, tx->overflow_skb);
                tx->overflow_skb = NULL;
                netif_wake_queue(adapter->netdev);
        }

        if (!napi_complete(napi))
                goto done;

        /* enable isr */
        lan743x_csr_write(adapter, INT_EN_SET,
                          INT_BIT_DMA_TX_(tx->channel_number));
        lan743x_csr_read(adapter, INT_STS);

done:
        return 0;
}

static void lan743x_tx_ring_cleanup(struct lan743x_tx *tx)
{
        if (tx->head_cpu_ptr) {
                dma_free_coherent(&tx->adapter->pdev->dev,
                                  sizeof(*tx->head_cpu_ptr), tx->head_cpu_ptr,
                                  tx->head_dma_ptr);
                tx->head_cpu_ptr = NULL;
                tx->head_dma_ptr = 0;
        }
        kfree(tx->buffer_info);
        tx->buffer_info = NULL;

        if (tx->ring_cpu_ptr) {
                dma_free_coherent(&tx->adapter->pdev->dev,
                                  tx->ring_allocation_size, tx->ring_cpu_ptr,
                                  tx->ring_dma_ptr);
                tx->ring_allocation_size = 0;
                tx->ring_cpu_ptr = NULL;
                tx->ring_dma_ptr = 0;
        }
        tx->ring_size = 0;
}

static int lan743x_tx_ring_init(struct lan743x_tx *tx)
{
        size_t ring_allocation_size = 0;
        void *cpu_ptr = NULL;
        dma_addr_t dma_ptr;
        int ret = -ENOMEM;

        tx->ring_size = LAN743X_TX_RING_SIZE;
        if (tx->ring_size & ~TX_CFG_B_TX_RING_LEN_MASK_) {
                ret = -EINVAL;
                goto cleanup;
        }
        if (dma_set_mask_and_coherent(&tx->adapter->pdev->dev,
                                      DMA_BIT_MASK(64))) {
                if (dma_set_mask_and_coherent(&tx->adapter->pdev->dev,
                                              DMA_BIT_MASK(32))) {
                        dev_warn(&tx->adapter->pdev->dev,
                                 "lan743x_: No suitable DMA available\n");
                        ret = -ENOMEM;
                        goto cleanup;
                }
        }
        ring_allocation_size = ALIGN(tx->ring_size *
                                     sizeof(struct lan743x_tx_descriptor),
                                     PAGE_SIZE);
        dma_ptr = 0;
        cpu_ptr = dma_alloc_coherent(&tx->adapter->pdev->dev,
                                     ring_allocation_size, &dma_ptr, GFP_KERNEL);
        if (!cpu_ptr) {
                ret = -ENOMEM;
                goto cleanup;
        }

        tx->ring_allocation_size = ring_allocation_size;
        tx->ring_cpu_ptr = (struct lan743x_tx_descriptor *)cpu_ptr;
        tx->ring_dma_ptr = dma_ptr;

        cpu_ptr = kcalloc(tx->ring_size, sizeof(*tx->buffer_info), GFP_KERNEL);
        if (!cpu_ptr) {
                ret = -ENOMEM;
                goto cleanup;
        }
        tx->buffer_info = (struct lan743x_tx_buffer_info *)cpu_ptr;
        dma_ptr = 0;
        cpu_ptr = dma_alloc_coherent(&tx->adapter->pdev->dev,
                                     sizeof(*tx->head_cpu_ptr), &dma_ptr,
                                     GFP_KERNEL);
        if (!cpu_ptr) {
                ret = -ENOMEM;
                goto cleanup;
        }

        tx->head_cpu_ptr = cpu_ptr;
        tx->head_dma_ptr = dma_ptr;
        if (tx->head_dma_ptr & 0x3) {
                ret = -ENOMEM;
                goto cleanup;
        }

        return 0;

cleanup:
        lan743x_tx_ring_cleanup(tx);
        return ret;
}

static void lan743x_tx_close(struct lan743x_tx *tx)
{
        struct lan743x_adapter *adapter = tx->adapter;

        lan743x_csr_write(adapter,
                          DMAC_CMD,
                          DMAC_CMD_STOP_T_(tx->channel_number));
        lan743x_dmac_tx_wait_till_stopped(adapter, tx->channel_number);

        lan743x_csr_write(adapter,
                          DMAC_INT_EN_CLR,
                          DMAC_INT_BIT_TX_IOC_(tx->channel_number));
        lan743x_csr_write(adapter, INT_EN_CLR,
                          INT_BIT_DMA_TX_(tx->channel_number));
        napi_disable(&tx->napi);
        netif_napi_del(&tx->napi);

        lan743x_csr_write(adapter, FCT_TX_CTL,
                          FCT_TX_CTL_DIS_(tx->channel_number));
        lan743x_csr_wait_for_bit(adapter, FCT_TX_CTL,
                                 FCT_TX_CTL_EN_(tx->channel_number),
                                 0, 1000, 20000, 100);

        lan743x_tx_release_all_descriptors(tx);

        if (tx->overflow_skb) {
                dev_kfree_skb(tx->overflow_skb);
                tx->overflow_skb = NULL;
        }

        lan743x_tx_ring_cleanup(tx);
}

static int lan743x_tx_open(struct lan743x_tx *tx)
{
        struct lan743x_adapter *adapter = NULL;
        u32 data = 0;
        int ret;

        adapter = tx->adapter;
        ret = lan743x_tx_ring_init(tx);
        if (ret)
                return ret;

        /* initialize fifo */
        lan743x_csr_write(adapter, FCT_TX_CTL,
                          FCT_TX_CTL_RESET_(tx->channel_number));
        lan743x_csr_wait_for_bit(adapter, FCT_TX_CTL,
                                 FCT_TX_CTL_RESET_(tx->channel_number),
                                 0, 1000, 20000, 100);

        /* enable fifo */
        lan743x_csr_write(adapter, FCT_TX_CTL,
                          FCT_TX_CTL_EN_(tx->channel_number));

        /* reset tx channel */
        lan743x_csr_write(adapter, DMAC_CMD,
                          DMAC_CMD_TX_SWR_(tx->channel_number));
        lan743x_csr_wait_for_bit(adapter, DMAC_CMD,
                                 DMAC_CMD_TX_SWR_(tx->channel_number),
                                 0, 1000, 20000, 100);

        /* Write TX_BASE_ADDR */
        lan743x_csr_write(adapter,
                          TX_BASE_ADDRH(tx->channel_number),
                          DMA_ADDR_HIGH32(tx->ring_dma_ptr));
        lan743x_csr_write(adapter,
                          TX_BASE_ADDRL(tx->channel_number),
                          DMA_ADDR_LOW32(tx->ring_dma_ptr));

        /* Write TX_CFG_B */
        data = lan743x_csr_read(adapter, TX_CFG_B(tx->channel_number));
        data &= ~TX_CFG_B_TX_RING_LEN_MASK_;
        data |= ((tx->ring_size) & TX_CFG_B_TX_RING_LEN_MASK_);
        if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0))
                data |= TX_CFG_B_TDMABL_512_;
        lan743x_csr_write(adapter, TX_CFG_B(tx->channel_number), data);

        /* Write TX_CFG_A */
        data = TX_CFG_A_TX_TMR_HPWB_SEL_IOC_ | TX_CFG_A_TX_HP_WB_EN_;
        if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0)) {
                data |= TX_CFG_A_TX_HP_WB_ON_INT_TMR_;
                data |= TX_CFG_A_TX_PF_THRES_SET_(0x10);
                data |= TX_CFG_A_TX_PF_PRI_THRES_SET_(0x04);
                data |= TX_CFG_A_TX_HP_WB_THRES_SET_(0x07);
        }
        lan743x_csr_write(adapter, TX_CFG_A(tx->channel_number), data);

        /* Write TX_HEAD_WRITEBACK_ADDR */
        lan743x_csr_write(adapter,
                          TX_HEAD_WRITEBACK_ADDRH(tx->channel_number),
                          DMA_ADDR_HIGH32(tx->head_dma_ptr));
        lan743x_csr_write(adapter,
                          TX_HEAD_WRITEBACK_ADDRL(tx->channel_number),
                          DMA_ADDR_LOW32(tx->head_dma_ptr));

        /* set last head */
        tx->last_head = lan743x_csr_read(adapter, TX_HEAD(tx->channel_number));

        /* write TX_TAIL */
        tx->last_tail = 0;
        lan743x_csr_write(adapter, TX_TAIL(tx->channel_number),
                          (u32)(tx->last_tail));
        tx->vector_flags = lan743x_intr_get_vector_flags(adapter,
                                                         INT_BIT_DMA_TX_
                                                         (tx->channel_number));
        netif_tx_napi_add(adapter->netdev,
                          &tx->napi, lan743x_tx_napi_poll,
                          tx->ring_size - 1);
        napi_enable(&tx->napi);

        data = 0;
        if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_CLEAR)
                data |= TX_CFG_C_TX_TOP_INT_EN_AUTO_CLR_;
        if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_AUTO_CLEAR)
                data |= TX_CFG_C_TX_DMA_INT_STS_AUTO_CLR_;
        if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_R2C)
                data |= TX_CFG_C_TX_INT_STS_R2C_MODE_MASK_;
        if (tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_R2C)
                data |= TX_CFG_C_TX_INT_EN_R2C_;
        lan743x_csr_write(adapter, TX_CFG_C(tx->channel_number), data);

        if (!(tx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET))
                lan743x_csr_write(adapter, INT_EN_SET,
                                  INT_BIT_DMA_TX_(tx->channel_number));
        lan743x_csr_write(adapter, DMAC_INT_EN_SET,
                          DMAC_INT_BIT_TX_IOC_(tx->channel_number));

        /*  start dmac channel */
        lan743x_csr_write(adapter, DMAC_CMD,
                          DMAC_CMD_START_T_(tx->channel_number));
        return 0;
}

static int lan743x_rx_next_index(struct lan743x_rx *rx, int index)
{
        return ((++index) % rx->ring_size);
}

static void lan743x_rx_update_tail(struct lan743x_rx *rx, int index)
{
        /* update the tail once per 8 descriptors */
        if ((index & 7) == 7)
                lan743x_csr_write(rx->adapter, RX_TAIL(rx->channel_number),
                                  index);
}

static int lan743x_rx_init_ring_element(struct lan743x_rx *rx, int index,
                                        gfp_t gfp)
{
        struct net_device *netdev = rx->adapter->netdev;
        struct device *dev = &rx->adapter->pdev->dev;
        struct lan743x_rx_buffer_info *buffer_info;
        unsigned int buffer_length, used_length;
        struct lan743x_rx_descriptor *descriptor;
        struct sk_buff *skb;
        dma_addr_t dma_ptr;

        buffer_length = netdev->mtu + ETH_HLEN + ETH_FCS_LEN + RX_HEAD_PADDING;

        descriptor = &rx->ring_cpu_ptr[index];
        buffer_info = &rx->buffer_info[index];
        skb = __netdev_alloc_skb(netdev, buffer_length, gfp);
        if (!skb)
                return -ENOMEM;
        dma_ptr = dma_map_single(dev, skb->data, buffer_length, DMA_FROM_DEVICE);
        if (dma_mapping_error(dev, dma_ptr)) {
                dev_kfree_skb_any(skb);
                return -ENOMEM;
        }
        if (buffer_info->dma_ptr) {
                /* sync used area of buffer only */
                if (le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_LS_)
                        /* frame length is valid only if LS bit is set.
                         * it's a safe upper bound for the used area in this
                         * buffer.
                         */
                        used_length = min(RX_DESC_DATA0_FRAME_LENGTH_GET_
                                          (le32_to_cpu(descriptor->data0)),
                                          buffer_info->buffer_length);
                else
                        used_length = buffer_info->buffer_length;
                dma_sync_single_for_cpu(dev, buffer_info->dma_ptr,
                                        used_length,
                                        DMA_FROM_DEVICE);
                dma_unmap_single_attrs(dev, buffer_info->dma_ptr,
                                       buffer_info->buffer_length,
                                       DMA_FROM_DEVICE,
                                       DMA_ATTR_SKIP_CPU_SYNC);
        }

        buffer_info->skb = skb;
        buffer_info->dma_ptr = dma_ptr;
        buffer_info->buffer_length = buffer_length;
        descriptor->data1 = cpu_to_le32(DMA_ADDR_LOW32(buffer_info->dma_ptr));
        descriptor->data2 = cpu_to_le32(DMA_ADDR_HIGH32(buffer_info->dma_ptr));
        descriptor->data3 = 0;
        descriptor->data0 = cpu_to_le32((RX_DESC_DATA0_OWN_ |
                            (buffer_length & RX_DESC_DATA0_BUF_LENGTH_MASK_)));
        lan743x_rx_update_tail(rx, index);

        return 0;
}

static void lan743x_rx_reuse_ring_element(struct lan743x_rx *rx, int index)
{
        struct lan743x_rx_buffer_info *buffer_info;
        struct lan743x_rx_descriptor *descriptor;

        descriptor = &rx->ring_cpu_ptr[index];
        buffer_info = &rx->buffer_info[index];

        descriptor->data1 = cpu_to_le32(DMA_ADDR_LOW32(buffer_info->dma_ptr));
        descriptor->data2 = cpu_to_le32(DMA_ADDR_HIGH32(buffer_info->dma_ptr));
        descriptor->data3 = 0;
        descriptor->data0 = cpu_to_le32((RX_DESC_DATA0_OWN_ |
                            ((buffer_info->buffer_length) &
                            RX_DESC_DATA0_BUF_LENGTH_MASK_)));
        lan743x_rx_update_tail(rx, index);
}

static void lan743x_rx_release_ring_element(struct lan743x_rx *rx, int index)
{
        struct lan743x_rx_buffer_info *buffer_info;
        struct lan743x_rx_descriptor *descriptor;

        descriptor = &rx->ring_cpu_ptr[index];
        buffer_info = &rx->buffer_info[index];

        memset(descriptor, 0, sizeof(*descriptor));

        if (buffer_info->dma_ptr) {
                dma_unmap_single(&rx->adapter->pdev->dev,
                                 buffer_info->dma_ptr,
                                 buffer_info->buffer_length,
                                 DMA_FROM_DEVICE);
                buffer_info->dma_ptr = 0;
        }

        if (buffer_info->skb) {
                dev_kfree_skb(buffer_info->skb);
                buffer_info->skb = NULL;
        }

        memset(buffer_info, 0, sizeof(*buffer_info));
}

static struct sk_buff *
lan743x_rx_trim_skb(struct sk_buff *skb, int frame_length)
{
        if (skb_linearize(skb)) {
                dev_kfree_skb_irq(skb);
                return NULL;
        }
        frame_length = max_t(int, 0, frame_length - ETH_FCS_LEN);
        if (skb->len > frame_length) {
                skb->tail -= skb->len - frame_length;
                skb->len = frame_length;
        }
        return skb;
}

static int lan743x_rx_process_buffer(struct lan743x_rx *rx)
{
        int current_head_index = le32_to_cpu(*rx->head_cpu_ptr);
        struct lan743x_rx_descriptor *descriptor, *desc_ext;
        struct net_device *netdev = rx->adapter->netdev;
        int result = RX_PROCESS_RESULT_NOTHING_TO_DO;
        struct lan743x_rx_buffer_info *buffer_info;
        int frame_length, buffer_length;
        int extension_index = -1;
        bool is_last, is_first;
        struct sk_buff *skb;

        if (current_head_index < 0 || current_head_index >= rx->ring_size)
                goto done;

        if (rx->last_head < 0 || rx->last_head >= rx->ring_size)
                goto done;

        if (rx->last_head == current_head_index)
                goto done;

        descriptor = &rx->ring_cpu_ptr[rx->last_head];
        if (le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_OWN_)
                goto done;
        buffer_info = &rx->buffer_info[rx->last_head];

        is_last = le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_LS_;
        is_first = le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_FS_;

        if (is_last && le32_to_cpu(descriptor->data0) & RX_DESC_DATA0_EXT_) {
                /* extension is expected to follow */
                int index = lan743x_rx_next_index(rx, rx->last_head);

                if (index == current_head_index)
                        /* extension not yet available */
                        goto done;
                desc_ext = &rx->ring_cpu_ptr[index];
                if (le32_to_cpu(desc_ext->data0) & RX_DESC_DATA0_OWN_)
                        /* extension not yet available */
                        goto done;
                if (!(le32_to_cpu(desc_ext->data0) & RX_DESC_DATA0_EXT_))
                        goto move_forward;
                extension_index = index;
        }

        /* Only the last buffer in a multi-buffer frame contains the total frame
         * length. The chip occasionally sends more buffers than strictly
         * required to reach the total frame length.
         * Handle this by adding all buffers to the skb in their entirety.
         * Once the real frame length is known, trim the skb.
         */
        frame_length =
                RX_DESC_DATA0_FRAME_LENGTH_GET_(le32_to_cpu(descriptor->data0));
        buffer_length = buffer_info->buffer_length;

        netdev_dbg(netdev, "%s%schunk: %d/%d",
                   is_first ? "first " : "      ",
                   is_last  ? "last  " : "      ",
                   frame_length, buffer_length);

        /* save existing skb, allocate new skb and map to dma */
        skb = buffer_info->skb;
        if (lan743x_rx_init_ring_element(rx, rx->last_head,
                                         GFP_ATOMIC | GFP_DMA)) {
                /* failed to allocate next skb.
                 * Memory is very low.
                 * Drop this packet and reuse buffer.
                 */
                lan743x_rx_reuse_ring_element(rx, rx->last_head);
                /* drop packet that was being assembled */
                dev_kfree_skb_irq(rx->skb_head);
                rx->skb_head = NULL;
                goto process_extension;
        }

        /* add buffers to skb via skb->frag_list */
        if (is_first) {
                skb_reserve(skb, RX_HEAD_PADDING);
                skb_put(skb, buffer_length - RX_HEAD_PADDING);
                if (rx->skb_head)
                        dev_kfree_skb_irq(rx->skb_head);
                rx->skb_head = skb;
        } else if (rx->skb_head) {
                skb_put(skb, buffer_length);
                if (skb_shinfo(rx->skb_head)->frag_list)
                        rx->skb_tail->next = skb;
                else
                        skb_shinfo(rx->skb_head)->frag_list = skb;
                rx->skb_tail = skb;
                rx->skb_head->len += skb->len;
                rx->skb_head->data_len += skb->len;
                rx->skb_head->truesize += skb->truesize;
        } else {
                /* packet to assemble has already been dropped because one or
                 * more of its buffers could not be allocated
                 */
                netdev_dbg(netdev, "drop buffer intended for dropped packet");
                dev_kfree_skb_irq(skb);
        }

process_extension:
        if (extension_index >= 0) {
                u32 ts_sec;
                u32 ts_nsec;

                ts_sec = le32_to_cpu(desc_ext->data1);
                ts_nsec = (le32_to_cpu(desc_ext->data2) &
                          RX_DESC_DATA2_TS_NS_MASK_);
                if (rx->skb_head)
                        skb_hwtstamps(rx->skb_head)->hwtstamp =
                                ktime_set(ts_sec, ts_nsec);
                lan743x_rx_reuse_ring_element(rx, extension_index);
                rx->last_head = extension_index;
                netdev_dbg(netdev, "process extension");
        }

        if (is_last && rx->skb_head)
                rx->skb_head = lan743x_rx_trim_skb(rx->skb_head, frame_length);

        if (is_last && rx->skb_head) {
                rx->skb_head->protocol = eth_type_trans(rx->skb_head,
                                                        rx->adapter->netdev);
                netdev_dbg(netdev, "sending %d byte frame to OS",
                           rx->skb_head->len);
                napi_gro_receive(&rx->napi, rx->skb_head);
                rx->skb_head = NULL;
        }

move_forward:
        /* push tail and head forward */
        rx->last_tail = rx->last_head;
        rx->last_head = lan743x_rx_next_index(rx, rx->last_head);
        result = RX_PROCESS_RESULT_BUFFER_RECEIVED;
done:
        return result;
}

static int lan743x_rx_napi_poll(struct napi_struct *napi, int weight)
{
        struct lan743x_rx *rx = container_of(napi, struct lan743x_rx, napi);
        struct lan743x_adapter *adapter = rx->adapter;
        int result = RX_PROCESS_RESULT_NOTHING_TO_DO;
        u32 rx_tail_flags = 0;
        int count;

        if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_W2C) {
                /* clear int status bit before reading packet */
                lan743x_csr_write(adapter, DMAC_INT_STS,
                                  DMAC_INT_BIT_RXFRM_(rx->channel_number));
        }
        for (count = 0; count < weight; count++) {
                result = lan743x_rx_process_buffer(rx);
                if (result == RX_PROCESS_RESULT_NOTHING_TO_DO)
                        break;
        }
        rx->frame_count += count;
        if (count == weight || result == RX_PROCESS_RESULT_BUFFER_RECEIVED)
                return weight;

        if (!napi_complete_done(napi, count))
                return count;

        /* re-arm interrupts, must write to rx tail on some chip variants */
        if (rx->vector_flags & LAN743X_VECTOR_FLAG_VECTOR_ENABLE_AUTO_SET)
                rx_tail_flags |= RX_TAIL_SET_TOP_INT_VEC_EN_;
        if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_SET) {
                rx_tail_flags |= RX_TAIL_SET_TOP_INT_EN_;
        } else {
                lan743x_csr_write(adapter, INT_EN_SET,
                                  INT_BIT_DMA_RX_(rx->channel_number));
        }

        if (rx_tail_flags)
                lan743x_csr_write(adapter, RX_TAIL(rx->channel_number),
                                  rx_tail_flags | rx->last_tail);

        return count;
}

static void lan743x_rx_ring_cleanup(struct lan743x_rx *rx)
{
        if (rx->buffer_info && rx->ring_cpu_ptr) {
                int index;

                for (index = 0; index < rx->ring_size; index++)
                        lan743x_rx_release_ring_element(rx, index);
        }

        if (rx->head_cpu_ptr) {
                dma_free_coherent(&rx->adapter->pdev->dev,
                                  sizeof(*rx->head_cpu_ptr), rx->head_cpu_ptr,
                                  rx->head_dma_ptr);
                rx->head_cpu_ptr = NULL;
                rx->head_dma_ptr = 0;
        }

        kfree(rx->buffer_info);
        rx->buffer_info = NULL;

        if (rx->ring_cpu_ptr) {
                dma_free_coherent(&rx->adapter->pdev->dev,
                                  rx->ring_allocation_size, rx->ring_cpu_ptr,
                                  rx->ring_dma_ptr);
                rx->ring_allocation_size = 0;
                rx->ring_cpu_ptr = NULL;
                rx->ring_dma_ptr = 0;
        }

        rx->ring_size = 0;
        rx->last_head = 0;
}

static int lan743x_rx_ring_init(struct lan743x_rx *rx)
{
        size_t ring_allocation_size = 0;
        dma_addr_t dma_ptr = 0;
        void *cpu_ptr = NULL;
        int ret = -ENOMEM;
        int index = 0;

        rx->ring_size = LAN743X_RX_RING_SIZE;
        if (rx->ring_size <= 1) {
                ret = -EINVAL;
                goto cleanup;
        }
        if (rx->ring_size & ~RX_CFG_B_RX_RING_LEN_MASK_) {
                ret = -EINVAL;
                goto cleanup;
        }
        if (dma_set_mask_and_coherent(&rx->adapter->pdev->dev,
                                      DMA_BIT_MASK(64))) {
                if (dma_set_mask_and_coherent(&rx->adapter->pdev->dev,
                                              DMA_BIT_MASK(32))) {
                        dev_warn(&rx->adapter->pdev->dev,
                                 "lan743x_: No suitable DMA available\n");
                        ret = -ENOMEM;
                        goto cleanup;
                }
        }
        ring_allocation_size = ALIGN(rx->ring_size *
                                     sizeof(struct lan743x_rx_descriptor),
                                     PAGE_SIZE);
        dma_ptr = 0;
        cpu_ptr = dma_alloc_coherent(&rx->adapter->pdev->dev,
                                     ring_allocation_size, &dma_ptr, GFP_KERNEL);
        if (!cpu_ptr) {
                ret = -ENOMEM;
                goto cleanup;
        }
        rx->ring_allocation_size = ring_allocation_size;
        rx->ring_cpu_ptr = (struct lan743x_rx_descriptor *)cpu_ptr;
        rx->ring_dma_ptr = dma_ptr;

        cpu_ptr = kcalloc(rx->ring_size, sizeof(*rx->buffer_info),
                          GFP_KERNEL);
        if (!cpu_ptr) {
                ret = -ENOMEM;
                goto cleanup;
        }
        rx->buffer_info = (struct lan743x_rx_buffer_info *)cpu_ptr;
        dma_ptr = 0;
        cpu_ptr = dma_alloc_coherent(&rx->adapter->pdev->dev,
                                     sizeof(*rx->head_cpu_ptr), &dma_ptr,
                                     GFP_KERNEL);
        if (!cpu_ptr) {
                ret = -ENOMEM;
                goto cleanup;
        }

        rx->head_cpu_ptr = cpu_ptr;
        rx->head_dma_ptr = dma_ptr;
        if (rx->head_dma_ptr & 0x3) {
                ret = -ENOMEM;
                goto cleanup;
        }

        rx->last_head = 0;
        for (index = 0; index < rx->ring_size; index++) {
                ret = lan743x_rx_init_ring_element(rx, index, GFP_KERNEL);
                if (ret)
                        goto cleanup;
        }
        return 0;

cleanup:
        netif_warn(rx->adapter, ifup, rx->adapter->netdev,
                   "Error allocating memory for LAN743x\n");

        lan743x_rx_ring_cleanup(rx);
        return ret;
}

static void lan743x_rx_close(struct lan743x_rx *rx)
{
        struct lan743x_adapter *adapter = rx->adapter;

        lan743x_csr_write(adapter, FCT_RX_CTL,
                          FCT_RX_CTL_DIS_(rx->channel_number));
        lan743x_csr_wait_for_bit(adapter, FCT_RX_CTL,
                                 FCT_RX_CTL_EN_(rx->channel_number),
                                 0, 1000, 20000, 100);

        lan743x_csr_write(adapter, DMAC_CMD,
                          DMAC_CMD_STOP_R_(rx->channel_number));
        lan743x_dmac_rx_wait_till_stopped(adapter, rx->channel_number);

        lan743x_csr_write(adapter, DMAC_INT_EN_CLR,
                          DMAC_INT_BIT_RXFRM_(rx->channel_number));
        lan743x_csr_write(adapter, INT_EN_CLR,
                          INT_BIT_DMA_RX_(rx->channel_number));
        napi_disable(&rx->napi);

        netif_napi_del(&rx->napi);

        lan743x_rx_ring_cleanup(rx);
}

static int lan743x_rx_open(struct lan743x_rx *rx)
{
        struct lan743x_adapter *adapter = rx->adapter;
        u32 data = 0;
        int ret;

        rx->frame_count = 0;
        ret = lan743x_rx_ring_init(rx);
        if (ret)
                goto return_error;

        netif_napi_add(adapter->netdev,
                       &rx->napi, lan743x_rx_napi_poll,
                       NAPI_POLL_WEIGHT);

        lan743x_csr_write(adapter, DMAC_CMD,
                          DMAC_CMD_RX_SWR_(rx->channel_number));
        lan743x_csr_wait_for_bit(adapter, DMAC_CMD,
                                 DMAC_CMD_RX_SWR_(rx->channel_number),
                                 0, 1000, 20000, 100);

        /* set ring base address */
        lan743x_csr_write(adapter,
                          RX_BASE_ADDRH(rx->channel_number),
                          DMA_ADDR_HIGH32(rx->ring_dma_ptr));
        lan743x_csr_write(adapter,
                          RX_BASE_ADDRL(rx->channel_number),
                          DMA_ADDR_LOW32(rx->ring_dma_ptr));

        /* set rx write back address */
        lan743x_csr_write(adapter,
                          RX_HEAD_WRITEBACK_ADDRH(rx->channel_number),
                          DMA_ADDR_HIGH32(rx->head_dma_ptr));
        lan743x_csr_write(adapter,
                          RX_HEAD_WRITEBACK_ADDRL(rx->channel_number),
                          DMA_ADDR_LOW32(rx->head_dma_ptr));
        data = RX_CFG_A_RX_HP_WB_EN_;
        if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0)) {
                data |= (RX_CFG_A_RX_WB_ON_INT_TMR_ |
                        RX_CFG_A_RX_WB_THRES_SET_(0x7) |
                        RX_CFG_A_RX_PF_THRES_SET_(16) |
                        RX_CFG_A_RX_PF_PRI_THRES_SET_(4));
        }

        /* set RX_CFG_A */
        lan743x_csr_write(adapter,
                          RX_CFG_A(rx->channel_number), data);

        /* set RX_CFG_B */
        data = lan743x_csr_read(adapter, RX_CFG_B(rx->channel_number));
        data &= ~RX_CFG_B_RX_PAD_MASK_;
        if (!RX_HEAD_PADDING)
                data |= RX_CFG_B_RX_PAD_0_;
        else
                data |= RX_CFG_B_RX_PAD_2_;
        data &= ~RX_CFG_B_RX_RING_LEN_MASK_;
        data |= ((rx->ring_size) & RX_CFG_B_RX_RING_LEN_MASK_);
        data |= RX_CFG_B_TS_ALL_RX_;
        if (!(adapter->csr.flags & LAN743X_CSR_FLAG_IS_A0))
                data |= RX_CFG_B_RDMABL_512_;

        lan743x_csr_write(adapter, RX_CFG_B(rx->channel_number), data);
        rx->vector_flags = lan743x_intr_get_vector_flags(adapter,
                                                         INT_BIT_DMA_RX_
                                                         (rx->channel_number));

        /* set RX_CFG_C */
        data = 0;
        if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_AUTO_CLEAR)
                data |= RX_CFG_C_RX_TOP_INT_EN_AUTO_CLR_;
        if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_AUTO_CLEAR)
                data |= RX_CFG_C_RX_DMA_INT_STS_AUTO_CLR_;
        if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_STATUS_R2C)
                data |= RX_CFG_C_RX_INT_STS_R2C_MODE_MASK_;
        if (rx->vector_flags & LAN743X_VECTOR_FLAG_SOURCE_ENABLE_R2C)
                data |= RX_CFG_C_RX_INT_EN_R2C_;
        lan743x_csr_write(adapter, RX_CFG_C(rx->channel_number), data);

        rx->last_tail = ((u32)(rx->ring_size - 1));
        lan743x_csr_write(adapter, RX_TAIL(rx->channel_number),
                          rx->last_tail);
        rx->last_head = lan743x_csr_read(adapter, RX_HEAD(rx->channel_number));
        if (rx->last_head) {
                ret = -EIO;
                goto napi_delete;
        }

        napi_enable(&rx->napi);

        lan743x_csr_write(adapter, INT_EN_SET,
                          INT_BIT_DMA_RX_(rx->channel_number));
        lan743x_csr_write(adapter, DMAC_INT_STS,
                          DMAC_INT_BIT_RXFRM_(rx->channel_number));
        lan743x_csr_write(adapter, DMAC_INT_EN_SET,
                          DMAC_INT_BIT_RXFRM_(rx->channel_number));
        lan743x_csr_write(adapter, DMAC_CMD,
                          DMAC_CMD_START_R_(rx->channel_number));

        /* initialize fifo */
        lan743x_csr_write(adapter, FCT_RX_CTL,
                          FCT_RX_CTL_RESET_(rx->channel_number));
        lan743x_csr_wait_for_bit(adapter, FCT_RX_CTL,
                                 FCT_RX_CTL_RESET_(rx->channel_number),
                                 0, 1000, 20000, 100);
        lan743x_csr_write(adapter, FCT_FLOW(rx->channel_number),
                          FCT_FLOW_CTL_REQ_EN_ |
                          FCT_FLOW_CTL_ON_THRESHOLD_SET_(0x2A) |
                          FCT_FLOW_CTL_OFF_THRESHOLD_SET_(0xA));

        /* enable fifo */
        lan743x_csr_write(adapter, FCT_RX_CTL,
                          FCT_RX_CTL_EN_(rx->channel_number));
        return 0;

napi_delete:
        netif_napi_del(&rx->napi);
        lan743x_rx_ring_cleanup(rx);

return_error:
        return ret;
}

static int lan743x_netdev_close(struct net_device *netdev)
{
        struct lan743x_adapter *adapter = netdev_priv(netdev);
        int index;

        lan743x_tx_close(&adapter->tx[0]);

        for (index = 0; index < LAN743X_USED_RX_CHANNELS; index++)
                lan743x_rx_close(&adapter->rx[index]);

        lan743x_ptp_close(adapter);

        lan743x_phy_close(adapter);

        lan743x_mac_close(adapter);

        lan743x_intr_close(adapter);

        return 0;
}

static int lan743x_netdev_open(struct net_device *netdev)
{
        struct lan743x_adapter *adapter = netdev_priv(netdev);
        int index;
        int ret;

        ret = lan743x_intr_open(adapter);
        if (ret)
                goto return_error;

        ret = lan743x_mac_open(adapter);
        if (ret)
                goto close_intr;

        ret = lan743x_phy_open(adapter);
        if (ret)
                goto close_mac;

        ret = lan743x_ptp_open(adapter);
        if (ret)
                goto close_phy;

        lan743x_rfe_open(adapter);

        for (index = 0; index < LAN743X_USED_RX_CHANNELS; index++) {
                ret = lan743x_rx_open(&adapter->rx[index]);
                if (ret)
                        goto close_rx;
        }

        ret = lan743x_tx_open(&adapter->tx[0]);
        if (ret)
                goto close_rx;

        return 0;

close_rx:
        for (index = 0; index < LAN743X_USED_RX_CHANNELS; index++) {
                if (adapter->rx[index].ring_cpu_ptr)
                        lan743x_rx_close(&adapter->rx[index]);
        }
        lan743x_ptp_close(adapter);

close_phy:
        lan743x_phy_close(adapter);

close_mac:
        lan743x_mac_close(adapter);

close_intr:
        lan743x_intr_close(adapter);

return_error:
        netif_warn(adapter, ifup, adapter->netdev,
                   "Error opening LAN743x\n");
        return ret;
}

static netdev_tx_t lan743x_netdev_xmit_frame(struct sk_buff *skb,
                                             struct net_device *netdev)
{
        struct lan743x_adapter *adapter = netdev_priv(netdev);

        return lan743x_tx_xmit_frame(&adapter->tx[0], skb);
}

static int lan743x_netdev_ioctl(struct net_device *netdev,
                                struct ifreq *ifr, int cmd)
{
        if (!netif_running(netdev))
                return -EINVAL;
        if (cmd == SIOCSHWTSTAMP)
                return lan743x_ptp_ioctl(netdev, ifr, cmd);
        return phy_mii_ioctl(netdev->phydev, ifr, cmd);
}

static void lan743x_netdev_set_multicast(struct net_device *netdev)
{
        struct lan743x_adapter *adapter = netdev_priv(netdev);

        lan743x_rfe_set_multicast(adapter);
}

static int lan743x_netdev_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct lan743x_adapter *adapter = netdev_priv(netdev);
        int ret = 0;

        ret = lan743x_mac_set_mtu(adapter, new_mtu);
        if (!ret)
                netdev->mtu = new_mtu;
        return ret;
}

static void lan743x_netdev_get_stats64(struct net_device *netdev,
                                       struct rtnl_link_stats64 *stats)
{
        struct lan743x_adapter *adapter = netdev_priv(netdev);

        stats->rx_packets = lan743x_csr_read(adapter, STAT_RX_TOTAL_FRAMES);
        stats->tx_packets = lan743x_csr_read(adapter, STAT_TX_TOTAL_FRAMES);
        stats->rx_bytes = lan743x_csr_read(adapter,
                                           STAT_RX_UNICAST_BYTE_COUNT) +
                          lan743x_csr_read(adapter,
                                           STAT_RX_BROADCAST_BYTE_COUNT) +
                          lan743x_csr_read(adapter,
                                           STAT_RX_MULTICAST_BYTE_COUNT);
        stats->tx_bytes = lan743x_csr_read(adapter,
                                           STAT_TX_UNICAST_BYTE_COUNT) +
                          lan743x_csr_read(adapter,
                                           STAT_TX_BROADCAST_BYTE_COUNT) +
                          lan743x_csr_read(adapter,
                                           STAT_TX_MULTICAST_BYTE_COUNT);
        stats->rx_errors = lan743x_csr_read(adapter, STAT_RX_FCS_ERRORS) +
                           lan743x_csr_read(adapter,
                                            STAT_RX_ALIGNMENT_ERRORS) +
                           lan743x_csr_read(adapter, STAT_RX_JABBER_ERRORS) +
                           lan743x_csr_read(adapter,
                                            STAT_RX_UNDERSIZE_FRAME_ERRORS) +
                           lan743x_csr_read(adapter,
                                            STAT_RX_OVERSIZE_FRAME_ERRORS);
        stats->tx_errors = lan743x_csr_read(adapter, STAT_TX_FCS_ERRORS) +
                           lan743x_csr_read(adapter,
                                            STAT_TX_EXCESS_DEFERRAL_ERRORS) +
                           lan743x_csr_read(adapter, STAT_TX_CARRIER_ERRORS);
        stats->rx_dropped = lan743x_csr_read(adapter,
                                             STAT_RX_DROPPED_FRAMES);
        stats->tx_dropped = lan743x_csr_read(adapter,
                                             STAT_TX_EXCESSIVE_COLLISION);
        stats->multicast = lan743x_csr_read(adapter,
                                            STAT_RX_MULTICAST_FRAMES) +
                           lan743x_csr_read(adapter,
                                            STAT_TX_MULTICAST_FRAMES);
        stats->collisions = lan743x_csr_read(adapter,
                                             STAT_TX_SINGLE_COLLISIONS) +
                            lan743x_csr_read(adapter,
                                             STAT_TX_MULTIPLE_COLLISIONS) +
                            lan743x_csr_read(adapter,
                                             STAT_TX_LATE_COLLISIONS);
}

static int lan743x_netdev_set_mac_address(struct net_device *netdev,
                                          void *addr)
{
        struct lan743x_adapter *adapter = netdev_priv(netdev);
        struct sockaddr *sock_addr = addr;
        int ret;

        ret = eth_prepare_mac_addr_change(netdev, sock_addr);
        if (ret)
                return ret;
        ether_addr_copy(netdev->dev_addr, sock_addr->sa_data);
        lan743x_mac_set_address(adapter, sock_addr->sa_data);
        lan743x_rfe_update_mac_address(adapter);
        return 0;
}

static const struct net_device_ops lan743x_netdev_ops = {
        .ndo_open               = lan743x_netdev_open,
        .ndo_stop               = lan743x_netdev_close,
        .ndo_start_xmit         = lan743x_netdev_xmit_frame,
        .ndo_eth_ioctl          = lan743x_netdev_ioctl,
        .ndo_set_rx_mode        = lan743x_netdev_set_multicast,
        .ndo_change_mtu         = lan743x_netdev_change_mtu,
        .ndo_get_stats64        = lan743x_netdev_get_stats64,
        .ndo_set_mac_address    = lan743x_netdev_set_mac_address,
};

static void lan743x_hardware_cleanup(struct lan743x_adapter *adapter)
{
        lan743x_csr_write(adapter, INT_EN_CLR, 0xFFFFFFFF);
}

static void lan743x_mdiobus_cleanup(struct lan743x_adapter *adapter)
{
        mdiobus_unregister(adapter->mdiobus);
}

static void lan743x_full_cleanup(struct lan743x_adapter *adapter)
{
        unregister_netdev(adapter->netdev);

        lan743x_mdiobus_cleanup(adapter);
        lan743x_hardware_cleanup(adapter);
        lan743x_pci_cleanup(adapter);
}

static int lan743x_hardware_init(struct lan743x_adapter *adapter,
                                 struct pci_dev *pdev)
{
        struct lan743x_tx *tx;
        int index;
        int ret;

        adapter->intr.irq = adapter->pdev->irq;
        lan743x_csr_write(adapter, INT_EN_CLR, 0xFFFFFFFF);

        ret = lan743x_gpio_init(adapter);
        if (ret)
                return ret;

        ret = lan743x_mac_init(adapter);
        if (ret)
                return ret;

        ret = lan743x_phy_init(adapter);
        if (ret)
                return ret;

        ret = lan743x_ptp_init(adapter);
        if (ret)
                return ret;

        lan743x_rfe_update_mac_address(adapter);

        ret = lan743x_dmac_init(adapter);
        if (ret)
                return ret;

        for (index = 0; index < LAN743X_USED_RX_CHANNELS; index++) {
                adapter->rx[index].adapter = adapter;
                adapter->rx[index].channel_number = index;
        }

        tx = &adapter->tx[0];
        tx->adapter = adapter;
        tx->channel_number = 0;
        spin_lock_init(&tx->ring_lock);
        return 0;
}

static int lan743x_mdiobus_init(struct lan743x_adapter *adapter)
{
        int ret;

        adapter->mdiobus = devm_mdiobus_alloc(&adapter->pdev->dev);
        if (!(adapter->mdiobus)) {
                ret = -ENOMEM;
                goto return_error;
        }

        adapter->mdiobus->priv = (void *)adapter;
        adapter->mdiobus->read = lan743x_mdiobus_read;
        adapter->mdiobus->write = lan743x_mdiobus_write;
        adapter->mdiobus->name = "lan743x-mdiobus";
        snprintf(adapter->mdiobus->id, MII_BUS_ID_SIZE,
                 "pci-%s", pci_name(adapter->pdev));

        if ((adapter->csr.id_rev & ID_REV_ID_MASK_) == ID_REV_ID_LAN7430_)
                /* LAN7430 uses internal phy at address 1 */
                adapter->mdiobus->phy_mask = ~(u32)BIT(1);

        /* register mdiobus */
        ret = mdiobus_register(adapter->mdiobus);
        if (ret < 0)
                goto return_error;
        return 0;

return_error:
        return ret;
}

/* lan743x_pcidev_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @id: entry in lan743x_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * initializes an adapter identified by a pci_dev structure.
 * The OS initialization, configuring of the adapter private structure,
 * and a hardware reset occur.
 **/
static int lan743x_pcidev_probe(struct pci_dev *pdev,
                                const struct pci_device_id *id)
{
        struct lan743x_adapter *adapter = NULL;
        struct net_device *netdev = NULL;
        int ret = -ENODEV;

        netdev = devm_alloc_etherdev(&pdev->dev,
                                     sizeof(struct lan743x_adapter));
        if (!netdev)
                goto return_error;

        SET_NETDEV_DEV(netdev, &pdev->dev);
        pci_set_drvdata(pdev, netdev);
        adapter = netdev_priv(netdev);
        adapter->netdev = netdev;
        adapter->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE |
                              NETIF_MSG_LINK | NETIF_MSG_IFUP |
                              NETIF_MSG_IFDOWN | NETIF_MSG_TX_QUEUED;
        netdev->max_mtu = LAN743X_MAX_FRAME_SIZE;

        of_get_mac_address(pdev->dev.of_node, adapter->mac_address);

        ret = lan743x_pci_init(adapter, pdev);
        if (ret)
                goto return_error;

        ret = lan743x_csr_init(adapter);
        if (ret)
                goto cleanup_pci;

        ret = lan743x_hardware_init(adapter, pdev);
        if (ret)
                goto cleanup_pci;

        ret = lan743x_mdiobus_init(adapter);
        if (ret)
                goto cleanup_hardware;

        adapter->netdev->netdev_ops = &lan743x_netdev_ops;
        adapter->netdev->ethtool_ops = &lan743x_ethtool_ops;
        adapter->netdev->features = NETIF_F_SG | NETIF_F_TSO | NETIF_F_HW_CSUM;
        adapter->netdev->hw_features = adapter->netdev->features;

        /* carrier off reporting is important to ethtool even BEFORE open */
        netif_carrier_off(netdev);

        ret = register_netdev(adapter->netdev);
        if (ret < 0)
                goto cleanup_mdiobus;
        return 0;

cleanup_mdiobus:
        lan743x_mdiobus_cleanup(adapter);

cleanup_hardware:
        lan743x_hardware_cleanup(adapter);

cleanup_pci:
        lan743x_pci_cleanup(adapter);

return_error:
        pr_warn("Initialization failed\n");
        return ret;
}

/**
 * lan743x_pcidev_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * this is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  This could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/
static void lan743x_pcidev_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct lan743x_adapter *adapter = netdev_priv(netdev);

        lan743x_full_cleanup(adapter);
}

static void lan743x_pcidev_shutdown(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct lan743x_adapter *adapter = netdev_priv(netdev);

        rtnl_lock();
        netif_device_detach(netdev);

        /* close netdev when netdev is at running state.
         * For instance, it is true when system goes to sleep by pm-suspend
         * However, it is false when system goes to sleep by suspend GUI menu
         */
        if (netif_running(netdev))
                lan743x_netdev_close(netdev);
        rtnl_unlock();

#ifdef CONFIG_PM
        pci_save_state(pdev);
#endif

        /* clean up lan743x portion */
        lan743x_hardware_cleanup(adapter);
}

#ifdef CONFIG_PM_SLEEP
static u16 lan743x_pm_wakeframe_crc16(const u8 *buf, int len)
{
        return bitrev16(crc16(0xFFFF, buf, len));
}

static void lan743x_pm_set_wol(struct lan743x_adapter *adapter)
{
        const u8 ipv4_multicast[3] = { 0x01, 0x00, 0x5E };
        const u8 ipv6_multicast[3] = { 0x33, 0x33 };
        const u8 arp_type[2] = { 0x08, 0x06 };
        int mask_index;
        u32 pmtctl;
        u32 wucsr;
        u32 macrx;
        u16 crc;

        for (mask_index = 0; mask_index < MAC_NUM_OF_WUF_CFG; mask_index++)
                lan743x_csr_write(adapter, MAC_WUF_CFG(mask_index), 0);

        /* clear wake settings */
        pmtctl = lan743x_csr_read(adapter, PMT_CTL);
        pmtctl |= PMT_CTL_WUPS_MASK_;
        pmtctl &= ~(PMT_CTL_GPIO_WAKEUP_EN_ | PMT_CTL_EEE_WAKEUP_EN_ |
                PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_ |
                PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_ | PMT_CTL_ETH_PHY_WAKE_EN_);

        macrx = lan743x_csr_read(adapter, MAC_RX);

        wucsr = 0;
        mask_index = 0;

        pmtctl |= PMT_CTL_ETH_PHY_D3_COLD_OVR_ | PMT_CTL_ETH_PHY_D3_OVR_;

        if (adapter->wolopts & WAKE_PHY) {
                pmtctl |= PMT_CTL_ETH_PHY_EDPD_PLL_CTL_;
                pmtctl |= PMT_CTL_ETH_PHY_WAKE_EN_;
        }
        if (adapter->wolopts & WAKE_MAGIC) {
                wucsr |= MAC_WUCSR_MPEN_;
                macrx |= MAC_RX_RXEN_;
                pmtctl |= PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_;
        }
        if (adapter->wolopts & WAKE_UCAST) {
                wucsr |= MAC_WUCSR_RFE_WAKE_EN_ | MAC_WUCSR_PFDA_EN_;
                macrx |= MAC_RX_RXEN_;
                pmtctl |= PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_;
                pmtctl |= PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_;
        }
        if (adapter->wolopts & WAKE_BCAST) {
                wucsr |= MAC_WUCSR_RFE_WAKE_EN_ | MAC_WUCSR_BCST_EN_;
                macrx |= MAC_RX_RXEN_;
                pmtctl |= PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_;
                pmtctl |= PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_;
        }
        if (adapter->wolopts & WAKE_MCAST) {
                /* IPv4 multicast */
                crc = lan743x_pm_wakeframe_crc16(ipv4_multicast, 3);
                lan743x_csr_write(adapter, MAC_WUF_CFG(mask_index),
                                  MAC_WUF_CFG_EN_ | MAC_WUF_CFG_TYPE_MCAST_ |
                                  (0 << MAC_WUF_CFG_OFFSET_SHIFT_) |
                                  (crc & MAC_WUF_CFG_CRC16_MASK_));
                lan743x_csr_write(adapter, MAC_WUF_MASK0(mask_index), 7);
                lan743x_csr_write(adapter, MAC_WUF_MASK1(mask_index), 0);
                lan743x_csr_write(adapter, MAC_WUF_MASK2(mask_index), 0);
                lan743x_csr_write(adapter, MAC_WUF_MASK3(mask_index), 0);
                mask_index++;

                /* IPv6 multicast */
                crc = lan743x_pm_wakeframe_crc16(ipv6_multicast, 2);
                lan743x_csr_write(adapter, MAC_WUF_CFG(mask_index),
                                  MAC_WUF_CFG_EN_ | MAC_WUF_CFG_TYPE_MCAST_ |
                                  (0 << MAC_WUF_CFG_OFFSET_SHIFT_) |
                                  (crc & MAC_WUF_CFG_CRC16_MASK_));
                lan743x_csr_write(adapter, MAC_WUF_MASK0(mask_index), 3);
                lan743x_csr_write(adapter, MAC_WUF_MASK1(mask_index), 0);
                lan743x_csr_write(adapter, MAC_WUF_MASK2(mask_index), 0);
                lan743x_csr_write(adapter, MAC_WUF_MASK3(mask_index), 0);
                mask_index++;

                wucsr |= MAC_WUCSR_RFE_WAKE_EN_ | MAC_WUCSR_WAKE_EN_;
                macrx |= MAC_RX_RXEN_;
                pmtctl |= PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_;
                pmtctl |= PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_;
        }
        if (adapter->wolopts & WAKE_ARP) {
                /* set MAC_WUF_CFG & WUF_MASK
                 * for packettype (offset 12,13) = ARP (0x0806)
                 */
                crc = lan743x_pm_wakeframe_crc16(arp_type, 2);
                lan743x_csr_write(adapter, MAC_WUF_CFG(mask_index),
                                  MAC_WUF_CFG_EN_ | MAC_WUF_CFG_TYPE_ALL_ |
                                  (0 << MAC_WUF_CFG_OFFSET_SHIFT_) |
                                  (crc & MAC_WUF_CFG_CRC16_MASK_));
                lan743x_csr_write(adapter, MAC_WUF_MASK0(mask_index), 0x3000);
                lan743x_csr_write(adapter, MAC_WUF_MASK1(mask_index), 0);
                lan743x_csr_write(adapter, MAC_WUF_MASK2(mask_index), 0);
                lan743x_csr_write(adapter, MAC_WUF_MASK3(mask_index), 0);
                mask_index++;