// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for Marvell PPv2 network controller for Armada 375 SoC.
 *
 * Copyright (C) 2014 Marvell
 *
 * Marcin Wojtas <mw@semihalf.com>
 */

#include <linux/acpi.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/platform_device.h>
#include <linux/skbuff.h>
#include <linux/inetdevice.h>
#include <linux/mbus.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/interrupt.h>
#include <linux/cpumask.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/phy.h>
#include <linux/phylink.h>
#include <linux/phy/phy.h>
#include <linux/clk.h>
#include <linux/hrtimer.h>
#include <linux/ktime.h>
#include <linux/regmap.h>
#include <uapi/linux/ppp_defs.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/tso.h>

#include "mvpp2.h"
#include "mvpp2_prs.h"
#include "mvpp2_cls.h"

enum mvpp2_bm_pool_log_num {
        MVPP2_BM_SHORT,
        MVPP2_BM_LONG,
        MVPP2_BM_JUMBO,
        MVPP2_BM_POOLS_NUM
};

static struct {
        int pkt_size;
        int buf_num;
} mvpp2_pools[MVPP2_BM_POOLS_NUM];

/* The prototype is added here to be used in start_dev when using ACPI. This
 * will be removed once phylink is used for all modes (dt+ACPI).
 */
static void mvpp2_mac_config(struct phylink_config *config, unsigned int mode,
                             const struct phylink_link_state *state);
static void mvpp2_mac_link_up(struct phylink_config *config, unsigned int mode,
                              phy_interface_t interface, struct phy_device *phy);

/* Queue modes */
#define MVPP2_QDIST_SINGLE_MODE 0
#define MVPP2_QDIST_MULTI_MODE  1

static int queue_mode = MVPP2_QDIST_MULTI_MODE;

module_param(queue_mode, int, 0444);
MODULE_PARM_DESC(queue_mode, "Set queue_mode (single=0, multi=1)");

/* Utility/helper methods */

void mvpp2_write(struct mvpp2 *priv, u32 offset, u32 data)
{
        writel(data, priv->swth_base[0] + offset);
}

u32 mvpp2_read(struct mvpp2 *priv, u32 offset)
{
        return readl(priv->swth_base[0] + offset);
}

static u32 mvpp2_read_relaxed(struct mvpp2 *priv, u32 offset)
{
        return readl_relaxed(priv->swth_base[0] + offset);
}

static inline u32 mvpp2_cpu_to_thread(struct mvpp2 *priv, int cpu)
{
        return cpu % priv->nthreads;
}

/* These accessors should be used to access:
 *
 * - per-thread registers, where each thread has its own copy of the
 *   register.
 *
 *   MVPP2_BM_VIRT_ALLOC_REG
 *   MVPP2_BM_ADDR_HIGH_ALLOC
 *   MVPP22_BM_ADDR_HIGH_RLS_REG
 *   MVPP2_BM_VIRT_RLS_REG
 *   MVPP2_ISR_RX_TX_CAUSE_REG
 *   MVPP2_ISR_RX_TX_MASK_REG
 *   MVPP2_TXQ_NUM_REG
 *   MVPP2_AGGR_TXQ_UPDATE_REG
 *   MVPP2_TXQ_RSVD_REQ_REG
 *   MVPP2_TXQ_RSVD_RSLT_REG
 *   MVPP2_TXQ_SENT_REG
 *   MVPP2_RXQ_NUM_REG
 *
 * - global registers that must be accessed through a specific thread
 *   window, because they are related to an access to a per-thread
 *   register
 *
 *   MVPP2_BM_PHY_ALLOC_REG    (related to MVPP2_BM_VIRT_ALLOC_REG)
 *   MVPP2_BM_PHY_RLS_REG      (related to MVPP2_BM_VIRT_RLS_REG)
 *   MVPP2_RXQ_THRESH_REG      (related to MVPP2_RXQ_NUM_REG)
 *   MVPP2_RXQ_DESC_ADDR_REG   (related to MVPP2_RXQ_NUM_REG)
 *   MVPP2_RXQ_DESC_SIZE_REG   (related to MVPP2_RXQ_NUM_REG)
 *   MVPP2_RXQ_INDEX_REG       (related to MVPP2_RXQ_NUM_REG)
 *   MVPP2_TXQ_PENDING_REG     (related to MVPP2_TXQ_NUM_REG)
 *   MVPP2_TXQ_DESC_ADDR_REG   (related to MVPP2_TXQ_NUM_REG)
 *   MVPP2_TXQ_DESC_SIZE_REG   (related to MVPP2_TXQ_NUM_REG)
 *   MVPP2_TXQ_INDEX_REG       (related to MVPP2_TXQ_NUM_REG)
 *   MVPP2_TXQ_PENDING_REG     (related to MVPP2_TXQ_NUM_REG)
 *   MVPP2_TXQ_PREF_BUF_REG    (related to MVPP2_TXQ_NUM_REG)
 *   MVPP2_TXQ_PREF_BUF_REG    (related to MVPP2_TXQ_NUM_REG)
 */
static void mvpp2_thread_write(struct mvpp2 *priv, unsigned int thread,
                               u32 offset, u32 data)
{
        writel(data, priv->swth_base[thread] + offset);
}

static u32 mvpp2_thread_read(struct mvpp2 *priv, unsigned int thread,
                             u32 offset)
{
        return readl(priv->swth_base[thread] + offset);
}

static void mvpp2_thread_write_relaxed(struct mvpp2 *priv, unsigned int thread,
                                       u32 offset, u32 data)
{
        writel_relaxed(data, priv->swth_base[thread] + offset);
}

static u32 mvpp2_thread_read_relaxed(struct mvpp2 *priv, unsigned int thread,
                                     u32 offset)
{
        return readl_relaxed(priv->swth_base[thread] + offset);
}

static dma_addr_t mvpp2_txdesc_dma_addr_get(struct mvpp2_port *port,
                                            struct mvpp2_tx_desc *tx_desc)
{
        if (port->priv->hw_version == MVPP21)
                return le32_to_cpu(tx_desc->pp21.buf_dma_addr);
        else
                return le64_to_cpu(tx_desc->pp22.buf_dma_addr_ptp) &
                       MVPP2_DESC_DMA_MASK;
}

static void mvpp2_txdesc_dma_addr_set(struct mvpp2_port *port,
                                      struct mvpp2_tx_desc *tx_desc,
                                      dma_addr_t dma_addr)
{
        dma_addr_t addr, offset;

        addr = dma_addr & ~MVPP2_TX_DESC_ALIGN;
        offset = dma_addr & MVPP2_TX_DESC_ALIGN;

        if (port->priv->hw_version == MVPP21) {
                tx_desc->pp21.buf_dma_addr = cpu_to_le32(addr);
                tx_desc->pp21.packet_offset = offset;
        } else {
                __le64 val = cpu_to_le64(addr);

                tx_desc->pp22.buf_dma_addr_ptp &= ~cpu_to_le64(MVPP2_DESC_DMA_MASK);
                tx_desc->pp22.buf_dma_addr_ptp |= val;
                tx_desc->pp22.packet_offset = offset;
        }
}

static size_t mvpp2_txdesc_size_get(struct mvpp2_port *port,
                                    struct mvpp2_tx_desc *tx_desc)
{
        if (port->priv->hw_version == MVPP21)
                return le16_to_cpu(tx_desc->pp21.data_size);
        else
                return le16_to_cpu(tx_desc->pp22.data_size);
}

static void mvpp2_txdesc_size_set(struct mvpp2_port *port,
                                  struct mvpp2_tx_desc *tx_desc,
                                  size_t size)
{
        if (port->priv->hw_version == MVPP21)
                tx_desc->pp21.data_size = cpu_to_le16(size);
        else
                tx_desc->pp22.data_size = cpu_to_le16(size);
}

static void mvpp2_txdesc_txq_set(struct mvpp2_port *port,
                                 struct mvpp2_tx_desc *tx_desc,
                                 unsigned int txq)
{
        if (port->priv->hw_version == MVPP21)
                tx_desc->pp21.phys_txq = txq;
        else
                tx_desc->pp22.phys_txq = txq;
}

static void mvpp2_txdesc_cmd_set(struct mvpp2_port *port,
                                 struct mvpp2_tx_desc *tx_desc,
                                 unsigned int command)
{
        if (port->priv->hw_version == MVPP21)
                tx_desc->pp21.command = cpu_to_le32(command);
        else
                tx_desc->pp22.command = cpu_to_le32(command);
}

static unsigned int mvpp2_txdesc_offset_get(struct mvpp2_port *port,
                                            struct mvpp2_tx_desc *tx_desc)
{
        if (port->priv->hw_version == MVPP21)
                return tx_desc->pp21.packet_offset;
        else
                return tx_desc->pp22.packet_offset;
}

static dma_addr_t mvpp2_rxdesc_dma_addr_get(struct mvpp2_port *port,
                                            struct mvpp2_rx_desc *rx_desc)
{
        if (port->priv->hw_version == MVPP21)
                return le32_to_cpu(rx_desc->pp21.buf_dma_addr);
        else
                return le64_to_cpu(rx_desc->pp22.buf_dma_addr_key_hash) &
                       MVPP2_DESC_DMA_MASK;
}

static unsigned long mvpp2_rxdesc_cookie_get(struct mvpp2_port *port,
                                             struct mvpp2_rx_desc *rx_desc)
{
        if (port->priv->hw_version == MVPP21)
                return le32_to_cpu(rx_desc->pp21.buf_cookie);
        else
                return le64_to_cpu(rx_desc->pp22.buf_cookie_misc) &
                       MVPP2_DESC_DMA_MASK;
}

static size_t mvpp2_rxdesc_size_get(struct mvpp2_port *port,
                                    struct mvpp2_rx_desc *rx_desc)
{
        if (port->priv->hw_version == MVPP21)
                return le16_to_cpu(rx_desc->pp21.data_size);
        else
                return le16_to_cpu(rx_desc->pp22.data_size);
}

static u32 mvpp2_rxdesc_status_get(struct mvpp2_port *port,
                                   struct mvpp2_rx_desc *rx_desc)
{
        if (port->priv->hw_version == MVPP21)
                return le32_to_cpu(rx_desc->pp21.status);
        else
                return le32_to_cpu(rx_desc->pp22.status);
}

static void mvpp2_txq_inc_get(struct mvpp2_txq_pcpu *txq_pcpu)
{
        txq_pcpu->txq_get_index++;
        if (txq_pcpu->txq_get_index == txq_pcpu->size)
                txq_pcpu->txq_get_index = 0;
}

static void mvpp2_txq_inc_put(struct mvpp2_port *port,
                              struct mvpp2_txq_pcpu *txq_pcpu,
                              struct sk_buff *skb,
                              struct mvpp2_tx_desc *tx_desc)
{
        struct mvpp2_txq_pcpu_buf *tx_buf =
                txq_pcpu->buffs + txq_pcpu->txq_put_index;
        tx_buf->skb = skb;
        tx_buf->size = mvpp2_txdesc_size_get(port, tx_desc);
        tx_buf->dma = mvpp2_txdesc_dma_addr_get(port, tx_desc) +
                mvpp2_txdesc_offset_get(port, tx_desc);
        txq_pcpu->txq_put_index++;
        if (txq_pcpu->txq_put_index == txq_pcpu->size)
                txq_pcpu->txq_put_index = 0;
}

/* Get number of maximum RXQ */
static int mvpp2_get_nrxqs(struct mvpp2 *priv)
{
        unsigned int nrxqs;

        if (priv->hw_version == MVPP22 && queue_mode == MVPP2_QDIST_SINGLE_MODE)
                return 1;

        /* According to the PPv2.2 datasheet and our experiments on
         * PPv2.1, RX queues have an allocation granularity of 4 (when
         * more than a single one on PPv2.2).
         * Round up to nearest multiple of 4.
         */
        nrxqs = (num_possible_cpus() + 3) & ~0x3;
        if (nrxqs > MVPP2_PORT_MAX_RXQ)
                nrxqs = MVPP2_PORT_MAX_RXQ;

        return nrxqs;
}

/* Get number of physical egress port */
static inline int mvpp2_egress_port(struct mvpp2_port *port)
{
        return MVPP2_MAX_TCONT + port->id;
}

/* Get number of physical TXQ */
static inline int mvpp2_txq_phys(int port, int txq)
{
        return (MVPP2_MAX_TCONT + port) * MVPP2_MAX_TXQ + txq;
}

static void *mvpp2_frag_alloc(const struct mvpp2_bm_pool *pool)
{
        if (likely(pool->frag_size <= PAGE_SIZE))
                return netdev_alloc_frag(pool->frag_size);
        else
                return kmalloc(pool->frag_size, GFP_ATOMIC);
}

static void mvpp2_frag_free(const struct mvpp2_bm_pool *pool, void *data)
{
        if (likely(pool->frag_size <= PAGE_SIZE))
                skb_free_frag(data);
        else
                kfree(data);
}

/* Buffer Manager configuration routines */

/* Create pool */
static int mvpp2_bm_pool_create(struct device *dev, struct mvpp2 *priv,
                                struct mvpp2_bm_pool *bm_pool, int size)
{
        u32 val;

        /* Number of buffer pointers must be a multiple of 16, as per
         * hardware constraints
         */
        if (!IS_ALIGNED(size, 16))
                return -EINVAL;

        /* PPv2.1 needs 8 bytes per buffer pointer, PPv2.2 needs 16
         * bytes per buffer pointer
         */
        if (priv->hw_version == MVPP21)
                bm_pool->size_bytes = 2 * sizeof(u32) * size;
        else
                bm_pool->size_bytes = 2 * sizeof(u64) * size;

        bm_pool->virt_addr = dma_alloc_coherent(dev, bm_pool->size_bytes,
                                                &bm_pool->dma_addr,
                                                GFP_KERNEL);
        if (!bm_pool->virt_addr)
                return -ENOMEM;

        if (!IS_ALIGNED((unsigned long)bm_pool->virt_addr,
                        MVPP2_BM_POOL_PTR_ALIGN)) {
                dma_free_coherent(dev, bm_pool->size_bytes,
                                  bm_pool->virt_addr, bm_pool->dma_addr);
                dev_err(dev, "BM pool %d is not %d bytes aligned\n",
                        bm_pool->id, MVPP2_BM_POOL_PTR_ALIGN);
                return -ENOMEM;
        }

        mvpp2_write(priv, MVPP2_BM_POOL_BASE_REG(bm_pool->id),
                    lower_32_bits(bm_pool->dma_addr));
        mvpp2_write(priv, MVPP2_BM_POOL_SIZE_REG(bm_pool->id), size);

        val = mvpp2_read(priv, MVPP2_BM_POOL_CTRL_REG(bm_pool->id));
        val |= MVPP2_BM_START_MASK;
        mvpp2_write(priv, MVPP2_BM_POOL_CTRL_REG(bm_pool->id), val);

        bm_pool->size = size;
        bm_pool->pkt_size = 0;
        bm_pool->buf_num = 0;

        return 0;
}

/* Set pool buffer size */
static void mvpp2_bm_pool_bufsize_set(struct mvpp2 *priv,
                                      struct mvpp2_bm_pool *bm_pool,
                                      int buf_size)
{
        u32 val;

        bm_pool->buf_size = buf_size;

        val = ALIGN(buf_size, 1 << MVPP2_POOL_BUF_SIZE_OFFSET);
        mvpp2_write(priv, MVPP2_POOL_BUF_SIZE_REG(bm_pool->id), val);
}

static void mvpp2_bm_bufs_get_addrs(struct device *dev, struct mvpp2 *priv,
                                    struct mvpp2_bm_pool *bm_pool,
                                    dma_addr_t *dma_addr,
                                    phys_addr_t *phys_addr)
{
        unsigned int thread = mvpp2_cpu_to_thread(priv, get_cpu());

        *dma_addr = mvpp2_thread_read(priv, thread,
                                      MVPP2_BM_PHY_ALLOC_REG(bm_pool->id));
        *phys_addr = mvpp2_thread_read(priv, thread, MVPP2_BM_VIRT_ALLOC_REG);

        if (priv->hw_version == MVPP22) {
                u32 val;
                u32 dma_addr_highbits, phys_addr_highbits;

                val = mvpp2_thread_read(priv, thread, MVPP22_BM_ADDR_HIGH_ALLOC);
                dma_addr_highbits = (val & MVPP22_BM_ADDR_HIGH_PHYS_MASK);
                phys_addr_highbits = (val & MVPP22_BM_ADDR_HIGH_VIRT_MASK) >>
                        MVPP22_BM_ADDR_HIGH_VIRT_SHIFT;

                if (sizeof(dma_addr_t) == 8)
                        *dma_addr |= (u64)dma_addr_highbits << 32;

                if (sizeof(phys_addr_t) == 8)
                        *phys_addr |= (u64)phys_addr_highbits << 32;
        }

        put_cpu();
}

/* Free all buffers from the pool */
static void mvpp2_bm_bufs_free(struct device *dev, struct mvpp2 *priv,
                               struct mvpp2_bm_pool *bm_pool, int buf_num)
{
        int i;

        if (buf_num > bm_pool->buf_num) {
                WARN(1, "Pool does not have so many bufs pool(%d) bufs(%d)\n",
                     bm_pool->id, buf_num);
                buf_num = bm_pool->buf_num;
        }

        for (i = 0; i < buf_num; i++) {
                dma_addr_t buf_dma_addr;
                phys_addr_t buf_phys_addr;
                void *data;

                mvpp2_bm_bufs_get_addrs(dev, priv, bm_pool,
                                        &buf_dma_addr, &buf_phys_addr);

                dma_unmap_single(dev, buf_dma_addr,
                                 bm_pool->buf_size, DMA_FROM_DEVICE);

                data = (void *)phys_to_virt(buf_phys_addr);
                if (!data)
                        break;

                mvpp2_frag_free(bm_pool, data);
        }

        /* Update BM driver with number of buffers removed from pool */
        bm_pool->buf_num -= i;
}

/* Check number of buffers in BM pool */
static int mvpp2_check_hw_buf_num(struct mvpp2 *priv, struct mvpp2_bm_pool *bm_pool)
{
        int buf_num = 0;

        buf_num += mvpp2_read(priv, MVPP2_BM_POOL_PTRS_NUM_REG(bm_pool->id)) &
                                    MVPP22_BM_POOL_PTRS_NUM_MASK;
        buf_num += mvpp2_read(priv, MVPP2_BM_BPPI_PTRS_NUM_REG(bm_pool->id)) &
                                    MVPP2_BM_BPPI_PTR_NUM_MASK;

        /* HW has one buffer ready which is not reflected in the counters */
        if (buf_num)
                buf_num += 1;

        return buf_num;
}

/* Cleanup pool */
static int mvpp2_bm_pool_destroy(struct device *dev, struct mvpp2 *priv,
                                 struct mvpp2_bm_pool *bm_pool)
{
        int buf_num;
        u32 val;

        buf_num = mvpp2_check_hw_buf_num(priv, bm_pool);
        mvpp2_bm_bufs_free(dev, priv, bm_pool, buf_num);

        /* Check buffer counters after free */
        buf_num = mvpp2_check_hw_buf_num(priv, bm_pool);
        if (buf_num) {
                WARN(1, "cannot free all buffers in pool %d, buf_num left %d\n",
                     bm_pool->id, bm_pool->buf_num);
                return 0;
        }

        val = mvpp2_read(priv, MVPP2_BM_POOL_CTRL_REG(bm_pool->id));
        val |= MVPP2_BM_STOP_MASK;
        mvpp2_write(priv, MVPP2_BM_POOL_CTRL_REG(bm_pool->id), val);

        dma_free_coherent(dev, bm_pool->size_bytes,
                          bm_pool->virt_addr,
                          bm_pool->dma_addr);
        return 0;
}

static int mvpp2_bm_pools_init(struct device *dev, struct mvpp2 *priv)
{
        int i, err, size, poolnum = MVPP2_BM_POOLS_NUM;
        struct mvpp2_bm_pool *bm_pool;

        if (priv->percpu_pools)
                poolnum = mvpp2_get_nrxqs(priv) * 2;

        /* Create all pools with maximum size */
        size = MVPP2_BM_POOL_SIZE_MAX;
        for (i = 0; i < poolnum; i++) {
                bm_pool = &priv->bm_pools[i];
                bm_pool->id = i;
                err = mvpp2_bm_pool_create(dev, priv, bm_pool, size);
                if (err)
                        goto err_unroll_pools;
                mvpp2_bm_pool_bufsize_set(priv, bm_pool, 0);
        }
        return 0;

err_unroll_pools:
        dev_err(dev, "failed to create BM pool %d, size %d\n", i, size);
        for (i = i - 1; i >= 0; i--)
                mvpp2_bm_pool_destroy(dev, priv, &priv->bm_pools[i]);
        return err;
}

static int mvpp2_bm_init(struct device *dev, struct mvpp2 *priv)
{
        int i, err, poolnum = MVPP2_BM_POOLS_NUM;

        if (priv->percpu_pools)
                poolnum = mvpp2_get_nrxqs(priv) * 2;

        dev_info(dev, "using %d %s buffers\n", poolnum,
                 priv->percpu_pools ? "per-cpu" : "shared");

        for (i = 0; i < poolnum; i++) {
                /* Mask BM all interrupts */
                mvpp2_write(priv, MVPP2_BM_INTR_MASK_REG(i), 0);
                /* Clear BM cause register */
                mvpp2_write(priv, MVPP2_BM_INTR_CAUSE_REG(i), 0);
        }

        /* Allocate and initialize BM pools */
        priv->bm_pools = devm_kcalloc(dev, poolnum,
                                      sizeof(*priv->bm_pools), GFP_KERNEL);
        if (!priv->bm_pools)
                return -ENOMEM;

        err = mvpp2_bm_pools_init(dev, priv);
        if (err < 0)
                return err;
        return 0;
}

static void mvpp2_setup_bm_pool(void)
{
        /* Short pool */
        mvpp2_pools[MVPP2_BM_SHORT].buf_num  = MVPP2_BM_SHORT_BUF_NUM;
        mvpp2_pools[MVPP2_BM_SHORT].pkt_size = MVPP2_BM_SHORT_PKT_SIZE;

        /* Long pool */
        mvpp2_pools[MVPP2_BM_LONG].buf_num  = MVPP2_BM_LONG_BUF_NUM;
        mvpp2_pools[MVPP2_BM_LONG].pkt_size = MVPP2_BM_LONG_PKT_SIZE;

        /* Jumbo pool */
        mvpp2_pools[MVPP2_BM_JUMBO].buf_num  = MVPP2_BM_JUMBO_BUF_NUM;
        mvpp2_pools[MVPP2_BM_JUMBO].pkt_size = MVPP2_BM_JUMBO_PKT_SIZE;
}

/* Attach long pool to rxq */
static void mvpp2_rxq_long_pool_set(struct mvpp2_port *port,
                                    int lrxq, int long_pool)
{
        u32 val, mask;
        int prxq;

        /* Get queue physical ID */
        prxq = port->rxqs[lrxq]->id;

        if (port->priv->hw_version == MVPP21)
                mask = MVPP21_RXQ_POOL_LONG_MASK;
        else
                mask = MVPP22_RXQ_POOL_LONG_MASK;

        val = mvpp2_read(port->priv, MVPP2_RXQ_CONFIG_REG(prxq));
        val &= ~mask;
        val |= (long_pool << MVPP2_RXQ_POOL_LONG_OFFS) & mask;
        mvpp2_write(port->priv, MVPP2_RXQ_CONFIG_REG(prxq), val);
}

/* Attach short pool to rxq */
static void mvpp2_rxq_short_pool_set(struct mvpp2_port *port,
                                     int lrxq, int short_pool)
{
        u32 val, mask;
        int prxq;

        /* Get queue physical ID */
        prxq = port->rxqs[lrxq]->id;

        if (port->priv->hw_version == MVPP21)
                mask = MVPP21_RXQ_POOL_SHORT_MASK;
        else
                mask = MVPP22_RXQ_POOL_SHORT_MASK;

        val = mvpp2_read(port->priv, MVPP2_RXQ_CONFIG_REG(prxq));
        val &= ~mask;
        val |= (short_pool << MVPP2_RXQ_POOL_SHORT_OFFS) & mask;
        mvpp2_write(port->priv, MVPP2_RXQ_CONFIG_REG(prxq), val);
}

static void *mvpp2_buf_alloc(struct mvpp2_port *port,
                             struct mvpp2_bm_pool *bm_pool,
                             dma_addr_t *buf_dma_addr,
                             phys_addr_t *buf_phys_addr,
                             gfp_t gfp_mask)
{
        dma_addr_t dma_addr;
        void *data;

        data = mvpp2_frag_alloc(bm_pool);
        if (!data)
                return NULL;

        dma_addr = dma_map_single(port->dev->dev.parent, data,
                                  MVPP2_RX_BUF_SIZE(bm_pool->pkt_size),
                                  DMA_FROM_DEVICE);
        if (unlikely(dma_mapping_error(port->dev->dev.parent, dma_addr))) {
                mvpp2_frag_free(bm_pool, data);
                return NULL;
        }
        *buf_dma_addr = dma_addr;
        *buf_phys_addr = virt_to_phys(data);

        return data;
}

/* Release buffer to BM */
static inline void mvpp2_bm_pool_put(struct mvpp2_port *port, int pool,
                                     dma_addr_t buf_dma_addr,
                                     phys_addr_t buf_phys_addr)
{
        unsigned int thread = mvpp2_cpu_to_thread(port->priv, get_cpu());
        unsigned long flags = 0;

        if (test_bit(thread, &port->priv->lock_map))
                spin_lock_irqsave(&port->bm_lock[thread], flags);

        if (port->priv->hw_version == MVPP22) {
                u32 val = 0;

                if (sizeof(dma_addr_t) == 8)
                        val |= upper_32_bits(buf_dma_addr) &
                                MVPP22_BM_ADDR_HIGH_PHYS_RLS_MASK;

                if (sizeof(phys_addr_t) == 8)
                        val |= (upper_32_bits(buf_phys_addr)
                                << MVPP22_BM_ADDR_HIGH_VIRT_RLS_SHIFT) &
                                MVPP22_BM_ADDR_HIGH_VIRT_RLS_MASK;

                mvpp2_thread_write_relaxed(port->priv, thread,
                                           MVPP22_BM_ADDR_HIGH_RLS_REG, val);
        }

        /* MVPP2_BM_VIRT_RLS_REG is not interpreted by HW, and simply
         * returned in the "cookie" field of the RX
         * descriptor. Instead of storing the virtual address, we
         * store the physical address
         */
        mvpp2_thread_write_relaxed(port->priv, thread,
                                   MVPP2_BM_VIRT_RLS_REG, buf_phys_addr);
        mvpp2_thread_write_relaxed(port->priv, thread,
                                   MVPP2_BM_PHY_RLS_REG(pool), buf_dma_addr);

        if (test_bit(thread, &port->priv->lock_map))
                spin_unlock_irqrestore(&port->bm_lock[thread], flags);

        put_cpu();
}

/* Allocate buffers for the pool */
static int mvpp2_bm_bufs_add(struct mvpp2_port *port,
                             struct mvpp2_bm_pool *bm_pool, int buf_num)
{
        int i, buf_size, total_size;
        dma_addr_t dma_addr;
        phys_addr_t phys_addr;
        void *buf;

        if (port->priv->percpu_pools &&
            bm_pool->pkt_size > MVPP2_BM_LONG_PKT_SIZE) {
                netdev_err(port->dev,
                           "attempted to use jumbo frames with per-cpu pools");
                return 0;
        }

        buf_size = MVPP2_RX_BUF_SIZE(bm_pool->pkt_size);
        total_size = MVPP2_RX_TOTAL_SIZE(buf_size);

        if (buf_num < 0 ||
            (buf_num + bm_pool->buf_num > bm_pool->size)) {
                netdev_err(port->dev,
                           "cannot allocate %d buffers for pool %d\n",
                           buf_num, bm_pool->id);
                return 0;
        }

        for (i = 0; i < buf_num; i++) {
                buf = mvpp2_buf_alloc(port, bm_pool, &dma_addr,
                                      &phys_addr, GFP_KERNEL);
                if (!buf)
                        break;

                mvpp2_bm_pool_put(port, bm_pool->id, dma_addr,
                                  phys_addr);
        }

        /* Update BM driver with number of buffers added to pool */
        bm_pool->buf_num += i;

        netdev_dbg(port->dev,
                   "pool %d: pkt_size=%4d, buf_size=%4d, total_size=%4d\n",
                   bm_pool->id, bm_pool->pkt_size, buf_size, total_size);

        netdev_dbg(port->dev,
                   "pool %d: %d of %d buffers added\n",
                   bm_pool->id, i, buf_num);
        return i;
}

/* Notify the driver that BM pool is being used as specific type and return the
 * pool pointer on success
 */
static struct mvpp2_bm_pool *
mvpp2_bm_pool_use(struct mvpp2_port *port, unsigned pool, int pkt_size)
{
        struct mvpp2_bm_pool *new_pool = &port->priv->bm_pools[pool];
        int num;

        if ((port->priv->percpu_pools && pool > mvpp2_get_nrxqs(port->priv) * 2) ||
            (!port->priv->percpu_pools && pool >= MVPP2_BM_POOLS_NUM)) {
                netdev_err(port->dev, "Invalid pool %d\n", pool);
                return NULL;
        }

        /* Allocate buffers in case BM pool is used as long pool, but packet
         * size doesn't match MTU or BM pool hasn't being used yet
         */
        if (new_pool->pkt_size == 0) {
                int pkts_num;

                /* Set default buffer number or free all the buffers in case
                 * the pool is not empty
                 */
                pkts_num = new_pool->buf_num;
                if (pkts_num == 0) {
                        if (port->priv->percpu_pools) {
                                if (pool < port->nrxqs)
                                        pkts_num = mvpp2_pools[MVPP2_BM_SHORT].buf_num;
                                else
                                        pkts_num = mvpp2_pools[MVPP2_BM_LONG].buf_num;
                        } else {
                                pkts_num = mvpp2_pools[pool].buf_num;
                        }
                } else {
                        mvpp2_bm_bufs_free(port->dev->dev.parent,
                                           port->priv, new_pool, pkts_num);
                }

                new_pool->pkt_size = pkt_size;
                new_pool->frag_size =
                        SKB_DATA_ALIGN(MVPP2_RX_BUF_SIZE(pkt_size)) +
                        MVPP2_SKB_SHINFO_SIZE;

                /* Allocate buffers for this pool */
                num = mvpp2_bm_bufs_add(port, new_pool, pkts_num);
                if (num != pkts_num) {
                        WARN(1, "pool %d: %d of %d allocated\n",
                             new_pool->id, num, pkts_num);
                        return NULL;
                }
        }

        mvpp2_bm_pool_bufsize_set(port->priv, new_pool,
                                  MVPP2_RX_BUF_SIZE(new_pool->pkt_size));

        return new_pool;
}

static struct mvpp2_bm_pool *
mvpp2_bm_pool_use_percpu(struct mvpp2_port *port, int type,
                         unsigned int pool, int pkt_size)
{
        struct mvpp2_bm_pool *new_pool = &port->priv->bm_pools[pool];
        int num;

        if (pool > port->nrxqs * 2) {
                netdev_err(port->dev, "Invalid pool %d\n", pool);
                return NULL;
        }

        /* Allocate buffers in case BM pool is used as long pool, but packet
         * size doesn't match MTU or BM pool hasn't being used yet
         */
        if (new_pool->pkt_size == 0) {
                int pkts_num;

                /* Set default buffer number or free all the buffers in case
                 * the pool is not empty
                 */
                pkts_num = new_pool->buf_num;
                if (pkts_num == 0)
                        pkts_num = mvpp2_pools[type].buf_num;
                else
                        mvpp2_bm_bufs_free(port->dev->dev.parent,
                                           port->priv, new_pool, pkts_num);

                new_pool->pkt_size = pkt_size;
                new_pool->frag_size =
                        SKB_DATA_ALIGN(MVPP2_RX_BUF_SIZE(pkt_size)) +
                        MVPP2_SKB_SHINFO_SIZE;

                /* Allocate buffers for this pool */
                num = mvpp2_bm_bufs_add(port, new_pool, pkts_num);
                if (num != pkts_num) {
                        WARN(1, "pool %d: %d of %d allocated\n",
                             new_pool->id, num, pkts_num);
                        return NULL;
                }
        }

        mvpp2_bm_pool_bufsize_set(port->priv, new_pool,
                                  MVPP2_RX_BUF_SIZE(new_pool->pkt_size));

        return new_pool;
}

/* Initialize pools for swf, shared buffers variant */
static int mvpp2_swf_bm_pool_init_shared(struct mvpp2_port *port)
{
        enum mvpp2_bm_pool_log_num long_log_pool, short_log_pool;
        int rxq;

        /* If port pkt_size is higher than 1518B:
         * HW Long pool - SW Jumbo pool, HW Short pool - SW Long pool
         * else: HW Long pool - SW Long pool, HW Short pool - SW Short pool
         */
        if (port->pkt_size > MVPP2_BM_LONG_PKT_SIZE) {
                long_log_pool = MVPP2_BM_JUMBO;
                short_log_pool = MVPP2_BM_LONG;
        } else {
                long_log_pool = MVPP2_BM_LONG;
                short_log_pool = MVPP2_BM_SHORT;
        }

        if (!port->pool_long) {
                port->pool_long =
                        mvpp2_bm_pool_use(port, long_log_pool,
                                          mvpp2_pools[long_log_pool].pkt_size);
                if (!port->pool_long)
                        return -ENOMEM;

                port->pool_long->port_map |= BIT(port->id);

                for (rxq = 0; rxq < port->nrxqs; rxq++)
                        mvpp2_rxq_long_pool_set(port, rxq, port->pool_long->id);
        }

        if (!port->pool_short) {
                port->pool_short =
                        mvpp2_bm_pool_use(port, short_log_pool,
                                          mvpp2_pools[short_log_pool].pkt_size);
                if (!port->pool_short)
                        return -ENOMEM;

                port->pool_short->port_map |= BIT(port->id);

                for (rxq = 0; rxq < port->nrxqs; rxq++)
                        mvpp2_rxq_short_pool_set(port, rxq,
                                                 port->pool_short->id);
        }

        return 0;
}

/* Initialize pools for swf, percpu buffers variant */
static int mvpp2_swf_bm_pool_init_percpu(struct mvpp2_port *port)
{
        struct mvpp2_bm_pool *p;
        int i;

        for (i = 0; i < port->nrxqs; i++) {
                p = mvpp2_bm_pool_use_percpu(port, MVPP2_BM_SHORT, i,
                                             mvpp2_pools[MVPP2_BM_SHORT].pkt_size);
                if (!p)
                        return -ENOMEM;

                port->priv->bm_pools[i].port_map |= BIT(port->id);
                mvpp2_rxq_short_pool_set(port, i, port->priv->bm_pools[i].id);
        }

        for (i = 0; i < port->nrxqs; i++) {
                p = mvpp2_bm_pool_use_percpu(port, MVPP2_BM_LONG, i + port->nrxqs,
                                             mvpp2_pools[MVPP2_BM_LONG].pkt_size);
                if (!p)
                        return -ENOMEM;

                port->priv->bm_pools[i + port->nrxqs].port_map |= BIT(port->id);
                mvpp2_rxq_long_pool_set(port, i,
                                        port->priv->bm_pools[i + port->nrxqs].id);
        }

        port->pool_long = NULL;
        port->pool_short = NULL;

        return 0;
}

static int mvpp2_swf_bm_pool_init(struct mvpp2_port *port)
{
        if (port->priv->percpu_pools)
                return mvpp2_swf_bm_pool_init_percpu(port);
        else
                return mvpp2_swf_bm_pool_init_shared(port);
}

static void mvpp2_set_hw_csum(struct mvpp2_port *port,
                              enum mvpp2_bm_pool_log_num new_long_pool)
{
        const netdev_features_t csums = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;

        /* Update L4 checksum when jumbo enable/disable on port.
         * Only port 0 supports hardware checksum offload due to
         * the Tx FIFO size limitation.
         * Also, don't set NETIF_F_HW_CSUM because L3_offset in TX descriptor
         * has 7 bits, so the maximum L3 offset is 128.
         */
        if (new_long_pool == MVPP2_BM_JUMBO && port->id != 0) {
                port->dev->features &= ~csums;
                port->dev->hw_features &= ~csums;
        } else {
                port->dev->features |= csums;
                port->dev->hw_features |= csums;
        }
}

static int mvpp2_bm_update_mtu(struct net_device *dev, int mtu)
{
        struct mvpp2_port *port = netdev_priv(dev);
        enum mvpp2_bm_pool_log_num new_long_pool;
        int pkt_size = MVPP2_RX_PKT_SIZE(mtu);

        if (port->priv->percpu_pools)
                goto out_set;

        /* If port MTU is higher than 1518B:
         * HW Long pool - SW Jumbo pool, HW Short pool - SW Long pool
         * else: HW Long pool - SW Long pool, HW Short pool - SW Short pool
         */
        if (pkt_size > MVPP2_BM_LONG_PKT_SIZE)
                new_long_pool = MVPP2_BM_JUMBO;
        else
                new_long_pool = MVPP2_BM_LONG;

        if (new_long_pool != port->pool_long->id) {
                /* Remove port from old short & long pool */
                port->pool_long = mvpp2_bm_pool_use(port, port->pool_long->id,
                                                    port->pool_long->pkt_size);
                port->pool_long->port_map &= ~BIT(port->id);
                port->pool_long = NULL;

                port->pool_short = mvpp2_bm_pool_use(port, port->pool_short->id,
                                                     port->pool_short->pkt_size);
                port->pool_short->port_map &= ~BIT(port->id);
                port->pool_short = NULL;

                port->pkt_size =  pkt_size;

                /* Add port to new short & long pool */
                mvpp2_swf_bm_pool_init(port);

                mvpp2_set_hw_csum(port, new_long_pool);

        }

out_set:
        dev->mtu = mtu;
        dev->wanted_features = dev->features;

        netdev_update_features(dev);
        return 0;
}

static inline void mvpp2_interrupts_enable(struct mvpp2_port *port)
{
        int i, sw_thread_mask = 0;

        for (i = 0; i < port->nqvecs; i++)
                sw_thread_mask |= port->qvecs[i].sw_thread_mask;

        mvpp2_write(port->priv, MVPP2_ISR_ENABLE_REG(port->id),
                    MVPP2_ISR_ENABLE_INTERRUPT(sw_thread_mask));
}

static inline void mvpp2_interrupts_disable(struct mvpp2_port *port)
{
        int i, sw_thread_mask = 0;

        for (i = 0; i < port->nqvecs; i++)
                sw_thread_mask |= port->qvecs[i].sw_thread_mask;

        mvpp2_write(port->priv, MVPP2_ISR_ENABLE_REG(port->id),
                    MVPP2_ISR_DISABLE_INTERRUPT(sw_thread_mask));
}

static inline void mvpp2_qvec_interrupt_enable(struct mvpp2_queue_vector *qvec)
{
        struct mvpp2_port *port = qvec->port;

        mvpp2_write(port->priv, MVPP2_ISR_ENABLE_REG(port->id),
                    MVPP2_ISR_ENABLE_INTERRUPT(qvec->sw_thread_mask));
}

static inline void mvpp2_qvec_interrupt_disable(struct mvpp2_queue_vector *qvec)
{
        struct mvpp2_port *port = qvec->port;

        mvpp2_write(port->priv, MVPP2_ISR_ENABLE_REG(port->id),
                    MVPP2_ISR_DISABLE_INTERRUPT(qvec->sw_thread_mask));
}

/* Mask the current thread's Rx/Tx interrupts
 * Called by on_each_cpu(), guaranteed to run with migration disabled,
 * using smp_processor_id() is OK.
 */
static void mvpp2_interrupts_mask(void *arg)
{
        struct mvpp2_port *port = arg;

        /* If the thread isn't used, don't do anything */
        if (smp_processor_id() > port->priv->nthreads)
                return;

        mvpp2_thread_write(port->priv,
                           mvpp2_cpu_to_thread(port->priv, smp_processor_id()),
                           MVPP2_ISR_RX_TX_MASK_REG(port->id), 0);
}

/* Unmask the current thread's Rx/Tx interrupts.
 * Called by on_each_cpu(), guaranteed to run with migration disabled,
 * using smp_processor_id() is OK.
 */
static void mvpp2_interrupts_unmask(void *arg)
{
        struct mvpp2_port *port = arg;
        u32 val;

        /* If the thread isn't used, don't do anything */
        if (smp_processor_id() > port->priv->nthreads)
                return;

        val = MVPP2_CAUSE_MISC_SUM_MASK |
                MVPP2_CAUSE_RXQ_OCCUP_DESC_ALL_MASK(port->priv->hw_version);
        if (port->has_tx_irqs)
                val |= MVPP2_CAUSE_TXQ_OCCUP_DESC_ALL_MASK;

        mvpp2_thread_write(port->priv,
                           mvpp2_cpu_to_thread(port->priv, smp_processor_id()),
                           MVPP2_ISR_RX_TX_MASK_REG(port->id), val);
}

static void
mvpp2_shared_interrupt_mask_unmask(struct mvpp2_port *port, bool mask)
{
        u32 val;
        int i;

        if (port->priv->hw_version != MVPP22)
                return;

        if (mask)
                val = 0;
        else
                val = MVPP2_CAUSE_RXQ_OCCUP_DESC_ALL_MASK(MVPP22);

        for (i = 0; i < port->nqvecs; i++) {
                struct mvpp2_queue_vector *v = port->qvecs + i;

                if (v->type != MVPP2_QUEUE_VECTOR_SHARED)
                        continue;

                mvpp2_thread_write(port->priv, v->sw_thread_id,
                                   MVPP2_ISR_RX_TX_MASK_REG(port->id), val);
        }
}

/* Port configuration routines */
static bool mvpp2_is_xlg(phy_interface_t interface)
{
        return interface == PHY_INTERFACE_MODE_10GBASER ||
               interface == PHY_INTERFACE_MODE_XAUI;
}

static void mvpp22_gop_init_rgmii(struct mvpp2_port *port)
{
        struct mvpp2 *priv = port->priv;
        u32 val;

        regmap_read(priv->sysctrl_base, GENCONF_PORT_CTRL0, &val);
        val |= GENCONF_PORT_CTRL0_BUS_WIDTH_SELECT;
        regmap_write(priv->sysctrl_base, GENCONF_PORT_CTRL0, val);

        regmap_read(priv->sysctrl_base, GENCONF_CTRL0, &val);
        if (port->gop_id == 2)
                val |= GENCONF_CTRL0_PORT0_RGMII | GENCONF_CTRL0_PORT1_RGMII;
        else if (port->gop_id == 3)
                val |= GENCONF_CTRL0_PORT1_RGMII_MII;
        regmap_write(priv->sysctrl_base, GENCONF_CTRL0, val);
}

static void mvpp22_gop_init_sgmii(struct mvpp2_port *port)
{
        struct mvpp2 *priv = port->priv;
        u32 val;

        regmap_read(priv->sysctrl_base, GENCONF_PORT_CTRL0, &val);
        val |= GENCONF_PORT_CTRL0_BUS_WIDTH_SELECT |
               GENCONF_PORT_CTRL0_RX_DATA_SAMPLE;
        regmap_write(priv->sysctrl_base, GENCONF_PORT_CTRL0, val);

        if (port->gop_id > 1) {
                regmap_read(priv->sysctrl_base, GENCONF_CTRL0, &val);
                if (port->gop_id == 2)
                        val &= ~GENCONF_CTRL0_PORT0_RGMII;
                else if (port->gop_id == 3)
                        val &= ~GENCONF_CTRL0_PORT1_RGMII_MII;
                regmap_write(priv->sysctrl_base, GENCONF_CTRL0, val);
        }
}

static void mvpp22_gop_init_10gkr(struct mvpp2_port *port)
{
        struct mvpp2 *priv = port->priv;
        void __iomem *mpcs = priv->iface_base + MVPP22_MPCS_BASE(port->gop_id);
        void __iomem *xpcs = priv->iface_base + MVPP22_XPCS_BASE(port->gop_id);
        u32 val;

        val = readl(xpcs + MVPP22_XPCS_CFG0);
        val &= ~(MVPP22_XPCS_CFG0_PCS_MODE(0x3) |
                 MVPP22_XPCS_CFG0_ACTIVE_LANE(0x3));
        val |= MVPP22_XPCS_CFG0_ACTIVE_LANE(2);
        writel(val, xpcs + MVPP22_XPCS_CFG0);

        val = readl(mpcs + MVPP22_MPCS_CTRL);
        val &= ~MVPP22_MPCS_CTRL_FWD_ERR_CONN;
        writel(val, mpcs + MVPP22_MPCS_CTRL);

        val = readl(mpcs + MVPP22_MPCS_CLK_RESET);
        val &= ~MVPP22_MPCS_CLK_RESET_DIV_RATIO(0x7);
        val |= MVPP22_MPCS_CLK_RESET_DIV_RATIO(1);
        writel(val, mpcs + MVPP22_MPCS_CLK_RESET);
}

static int mvpp22_gop_init(struct mvpp2_port *port)
{
        struct mvpp2 *priv = port->priv;
        u32 val;

        if (!priv->sysctrl_base)
                return 0;

        switch (port->phy_interface) {
        case PHY_INTERFACE_MODE_RGMII:
        case PHY_INTERFACE_MODE_RGMII_ID:
        case PHY_INTERFACE_MODE_RGMII_RXID:
        case PHY_INTERFACE_MODE_RGMII_TXID:
                if (port->gop_id == 0)
                        goto invalid_conf;
                mvpp22_gop_init_rgmii(port);
                break;
        case PHY_INTERFACE_MODE_SGMII:
        case PHY_INTERFACE_MODE_1000BASEX:
        case PHY_INTERFACE_MODE_2500BASEX:
                mvpp22_gop_init_sgmii(port);
                break;
        case PHY_INTERFACE_MODE_10GBASER:
                if (port->gop_id != 0)
                        goto invalid_conf;
                mvpp22_gop_init_10gkr(port);
                break;
        default:
                goto unsupported_conf;
        }

        regmap_read(priv->sysctrl_base, GENCONF_PORT_CTRL1, &val);
        val |= GENCONF_PORT_CTRL1_RESET(port->gop_id) |
               GENCONF_PORT_CTRL1_EN(port->gop_id);
        regmap_write(priv->sysctrl_base, GENCONF_PORT_CTRL1, val);

        regmap_read(priv->sysctrl_base, GENCONF_PORT_CTRL0, &val);
        val |= GENCONF_PORT_CTRL0_CLK_DIV_PHASE_CLR;
        regmap_write(priv->sysctrl_base, GENCONF_PORT_CTRL0, val);

        regmap_read(priv->sysctrl_base, GENCONF_SOFT_RESET1, &val);
        val |= GENCONF_SOFT_RESET1_GOP;
        regmap_write(priv->sysctrl_base, GENCONF_SOFT_RESET1, val);

unsupported_conf:
        return 0;

invalid_conf:
        netdev_err(port->dev, "Invalid port configuration\n");
        return -EINVAL;
}

static void mvpp22_gop_unmask_irq(struct mvpp2_port *port)
{
        u32 val;

        if (phy_interface_mode_is_rgmii(port->phy_interface) ||
            phy_interface_mode_is_8023z(port->phy_interface) ||
            port->phy_interface == PHY_INTERFACE_MODE_SGMII) {
                /* Enable the GMAC link status irq for this port */
                val = readl(port->base + MVPP22_GMAC_INT_SUM_MASK);
                val |= MVPP22_GMAC_INT_SUM_MASK_LINK_STAT;
                writel(val, port->base + MVPP22_GMAC_INT_SUM_MASK);
        }

        if (port->gop_id == 0) {
                /* Enable the XLG/GIG irqs for this port */
                val = readl(port->base + MVPP22_XLG_EXT_INT_MASK);
                if (mvpp2_is_xlg(port->phy_interface))
                        val |= MVPP22_XLG_EXT_INT_MASK_XLG;
                else
                        val |= MVPP22_XLG_EXT_INT_MASK_GIG;
                writel(val, port->base + MVPP22_XLG_EXT_INT_MASK);
        }
}

static void mvpp22_gop_mask_irq(struct mvpp2_port *port)
{
        u32 val;

        if (port->gop_id == 0) {
                val = readl(port->base + MVPP22_XLG_EXT_INT_MASK);
                val &= ~(MVPP22_XLG_EXT_INT_MASK_XLG |
                         MVPP22_XLG_EXT_INT_MASK_GIG);
                writel(val, port->base + MVPP22_XLG_EXT_INT_MASK);
        }

        if (phy_interface_mode_is_rgmii(port->phy_interface) ||
            phy_interface_mode_is_8023z(port->phy_interface) ||
            port->phy_interface == PHY_INTERFACE_MODE_SGMII) {
                val = readl(port->base + MVPP22_GMAC_INT_SUM_MASK);
                val &= ~MVPP22_GMAC_INT_SUM_MASK_LINK_STAT;
                writel(val, port->base + MVPP22_GMAC_INT_SUM_MASK);
        }
}

static void mvpp22_gop_setup_irq(struct mvpp2_port *port)
{
        u32 val;

        if (port->phylink ||
            phy_interface_mode_is_rgmii(port->phy_interface) ||
            phy_interface_mode_is_8023z(port->phy_interface) ||
            port->phy_interface == PHY_INTERFACE_MODE_SGMII) {
                val = readl(port->base + MVPP22_GMAC_INT_MASK);
                val |= MVPP22_GMAC_INT_MASK_LINK_STAT;
                writel(val, port->base + MVPP22_GMAC_INT_MASK);
        }

        if (port->gop_id == 0) {
                val = readl(port->base + MVPP22_XLG_INT_MASK);
                val |= MVPP22_XLG_INT_MASK_LINK;
                writel(val, port->base + MVPP22_XLG_INT_MASK);
        }

        mvpp22_gop_unmask_irq(port);
}

/* Sets the PHY mode of the COMPHY (which configures the serdes lanes).
 *
 * The PHY mode used by the PPv2 driver comes from the network subsystem, while
 * the one given to the COMPHY comes from the generic PHY subsystem. Hence they
 * differ.
 *
 * The COMPHY configures the serdes lanes regardless of the actual use of the
 * lanes by the physical layer. This is why configurations like
 * "PPv2 (2500BaseX) - COMPHY (2500SGMII)" are valid.
 */
static int mvpp22_comphy_init(struct mvpp2_port *port)
{
        int ret;

        if (!port->comphy)
                return 0;

        ret = phy_set_mode_ext(port->comphy, PHY_MODE_ETHERNET,
                               port->phy_interface);
        if (ret)
                return ret;

        return phy_power_on(port->comphy);
}

static void mvpp2_port_enable(struct mvpp2_port *port)
{
        u32 val;

        /* Only GOP port 0 has an XLG MAC */
        if (port->gop_id == 0 && mvpp2_is_xlg(port->phy_interface)) {
                val = readl(port->base + MVPP22_XLG_CTRL0_REG);
                val |= MVPP22_XLG_CTRL0_PORT_EN;
                val &= ~MVPP22_XLG_CTRL0_MIB_CNT_DIS;
                writel(val, port->base + MVPP22_XLG_CTRL0_REG);
        } else {
                val = readl(port->base + MVPP2_GMAC_CTRL_0_REG);
                val |= MVPP2_GMAC_PORT_EN_MASK;
                val |= MVPP2_GMAC_MIB_CNTR_EN_MASK;
                writel(val, port->base + MVPP2_GMAC_CTRL_0_REG);
        }
}

static void mvpp2_port_disable(struct mvpp2_port *port)
{
        u32 val;

        /* Only GOP port 0 has an XLG MAC */
        if (port->gop_id == 0 && mvpp2_is_xlg(port->phy_interface)) {
                val = readl(port->base + MVPP22_XLG_CTRL0_REG);
                val &= ~MVPP22_XLG_CTRL0_PORT_EN;
                writel(val, port->base + MVPP22_XLG_CTRL0_REG);
        }

        val = readl(port->base + MVPP2_GMAC_CTRL_0_REG);
        val &= ~(MVPP2_GMAC_PORT_EN_MASK);
        writel(val, port->base + MVPP2_GMAC_CTRL_0_REG);
}

/* Set IEEE 802.3x Flow Control Xon Packet Transmission Mode */
static void mvpp2_port_periodic_xon_disable(struct mvpp2_port *port)
{
        u32 val;

        val = readl(port->base + MVPP2_GMAC_CTRL_1_REG) &
                    ~MVPP2_GMAC_PERIODIC_XON_EN_MASK;
        writel(val, port->base + MVPP2_GMAC_CTRL_1_REG);
}

/* Configure loopback port */
static void mvpp2_port_loopback_set(struct mvpp2_port *port,
                                    const struct phylink_link_state *state)
{
        u32 val;

        val = readl(port->base + MVPP2_GMAC_CTRL_1_REG);

        if (state->speed == 1000)
                val |= MVPP2_GMAC_GMII_LB_EN_MASK;
        else
                val &= ~MVPP2_GMAC_GMII_LB_EN_MASK;

        if (phy_interface_mode_is_8023z(port->phy_interface) ||
            port->phy_interface == PHY_INTERFACE_MODE_SGMII)
                val |= MVPP2_GMAC_PCS_LB_EN_MASK;
        else
                val &= ~MVPP2_GMAC_PCS_LB_EN_MASK;

        writel(val, port->base + MVPP2_GMAC_CTRL_1_REG);
}

struct mvpp2_ethtool_counter {
        unsigned int offset;
        const char string[ETH_GSTRING_LEN];
        bool reg_is_64b;
};

static u64 mvpp2_read_count(struct mvpp2_port *port,
                            const struct mvpp2_ethtool_counter *counter)
{
        u64 val;

        val = readl(port->stats_base + counter->offset);
        if (counter->reg_is_64b)
                val += (u64)readl(port->stats_base + counter->offset + 4) << 32;

        return val;
}

/* Some counters are accessed indirectly by first writing an index to
 * MVPP2_CTRS_IDX. The index can represent various resources depending on the
 * register we access, it can be a hit counter for some classification tables,
 * a counter specific to a rxq, a txq or a buffer pool.
 */
static u32 mvpp2_read_index(struct mvpp2 *priv, u32 index, u32 reg)
{
        mvpp2_write(priv, MVPP2_CTRS_IDX, index);
        return mvpp2_read(priv, reg);
}

/* Due to the fact that software statistics and hardware statistics are, by
 * design, incremented at different moments in the chain of packet processing,
 * it is very likely that incoming packets could have been dropped after being
 * counted by hardware but before reaching software statistics (most probably
 * multicast packets), and in the oppposite way, during transmission, FCS bytes
 * are added in between as well as TSO skb will be split and header bytes added.
 * Hence, statistics gathered from userspace with ifconfig (software) and
 * ethtool (hardware) cannot be compared.
 */
static const struct mvpp2_ethtool_counter mvpp2_ethtool_mib_regs[] = {
        { MVPP2_MIB_GOOD_OCTETS_RCVD, "good_octets_received", true },
        { MVPP2_MIB_BAD_OCTETS_RCVD, "bad_octets_received" },
        { MVPP2_MIB_CRC_ERRORS_SENT, "crc_errors_sent" },
        { MVPP2_MIB_UNICAST_FRAMES_RCVD, "unicast_frames_received" },
        { MVPP2_MIB_BROADCAST_FRAMES_RCVD, "broadcast_frames_received" },
        { MVPP2_MIB_MULTICAST_FRAMES_RCVD, "multicast_frames_received" },
        { MVPP2_MIB_FRAMES_64_OCTETS, "frames_64_octets" },
        { MVPP2_MIB_FRAMES_65_TO_127_OCTETS, "frames_65_to_127_octet" },
        { MVPP2_MIB_FRAMES_128_TO_255_OCTETS, "frames_128_to_255_octet" },
        { MVPP2_MIB_FRAMES_256_TO_511_OCTETS, "frames_256_to_511_octet" },
        { MVPP2_MIB_FRAMES_512_TO_1023_OCTETS, "frames_512_to_1023_octet" },
        { MVPP2_MIB_FRAMES_1024_TO_MAX_OCTETS, "frames_1024_to_max_octet" },
        { MVPP2_MIB_GOOD_OCTETS_SENT, "good_octets_sent", true },
        { MVPP2_MIB_UNICAST_FRAMES_SENT, "unicast_frames_sent" },
        { MVPP2_MIB_MULTICAST_FRAMES_SENT, "multicast_frames_sent" },
        { MVPP2_MIB_BROADCAST_FRAMES_SENT, "broadcast_frames_sent" },
        { MVPP2_MIB_FC_SENT, "fc_sent" },
        { MVPP2_MIB_FC_RCVD, "fc_received" },
        { MVPP2_MIB_RX_FIFO_OVERRUN, "rx_fifo_overrun" },
        { MVPP2_MIB_UNDERSIZE_RCVD, "undersize_received" },
        { MVPP2_MIB_FRAGMENTS_RCVD, "fragments_received" },
        { MVPP2_MIB_OVERSIZE_RCVD, "oversize_received" },
        { MVPP2_MIB_JABBER_RCVD, "jabber_received" },
        { MVPP2_MIB_MAC_RCV_ERROR, "mac_receive_error" },
        { MVPP2_MIB_BAD_CRC_EVENT, "bad_crc_event" },
        { MVPP2_MIB_COLLISION, "collision" },
        { MVPP2_MIB_LATE_COLLISION, "late_collision" },
};

static const struct mvpp2_ethtool_counter mvpp2_ethtool_port_regs[] = {
        { MVPP2_OVERRUN_ETH_DROP, "rx_fifo_or_parser_overrun_drops" },
        { MVPP2_CLS_ETH_DROP, "rx_classifier_drops" },
};

static const struct mvpp2_ethtool_counter mvpp2_ethtool_txq_regs[] = {
        { MVPP2_TX_DESC_ENQ_CTR, "txq_%d_desc_enqueue" },
        { MVPP2_TX_DESC_ENQ_TO_DDR_CTR, "txq_%d_desc_enqueue_to_ddr" },
        { MVPP2_TX_BUFF_ENQ_TO_DDR_CTR, "txq_%d_buff_euqueue_to_ddr" },
        { MVPP2_TX_DESC_ENQ_HW_FWD_CTR, "txq_%d_desc_hardware_forwarded" },
        { MVPP2_TX_PKTS_DEQ_CTR, "txq_%d_packets_dequeued" },
        { MVPP2_TX_PKTS_FULL_QUEUE_DROP_CTR, "txq_%d_queue_full_drops" },
        { MVPP2_TX_PKTS_EARLY_DROP_CTR, "txq_%d_packets_early_drops" },
        { MVPP2_TX_PKTS_BM_DROP_CTR, "txq_%d_packets_bm_drops" },
        { MVPP2_TX_PKTS_BM_MC_DROP_CTR, "txq_%d_packets_rep_bm_drops" },
};

static const struct mvpp2_ethtool_counter mvpp2_ethtool_rxq_regs[] = {
        { MVPP2_RX_DESC_ENQ_CTR, "rxq_%d_desc_enqueue" },
        { MVPP2_RX_PKTS_FULL_QUEUE_DROP_CTR, "rxq_%d_queue_full_drops" },
        { MVPP2_RX_PKTS_EARLY_DROP_CTR, "rxq_%d_packets_early_drops" },
        { MVPP2_RX_PKTS_BM_DROP_CTR, "rxq_%d_packets_bm_drops" },
};

#define MVPP2_N_ETHTOOL_STATS(ntxqs, nrxqs)     (ARRAY_SIZE(mvpp2_ethtool_mib_regs) + \
                                                 ARRAY_SIZE(mvpp2_ethtool_port_regs) + \
                                                 (ARRAY_SIZE(mvpp2_ethtool_txq_regs) * (ntxqs)) + \
                                                 (ARRAY_SIZE(mvpp2_ethtool_rxq_regs) * (nrxqs)))

static void mvpp2_ethtool_get_strings(struct net_device *netdev, u32 sset,
                                      u8 *data)
{
        struct mvpp2_port *port = netdev_priv(netdev);
        int i, q;

        if (sset != ETH_SS_STATS)
                return;

        for (i = 0; i < ARRAY_SIZE(mvpp2_ethtool_mib_regs); i++) {
                strscpy(data, mvpp2_ethtool_mib_regs[i].string,
                        ETH_GSTRING_LEN);
                data += ETH_GSTRING_LEN;
        }

        for (i = 0; i < ARRAY_SIZE(mvpp2_ethtool_port_regs); i++) {
                strscpy(data, mvpp2_ethtool_port_regs[i].string,
                        ETH_GSTRING_LEN);
                data += ETH_GSTRING_LEN;
        }

        for (q = 0; q < port->ntxqs; q++) {
                for (i = 0; i < ARRAY_SIZE(mvpp2_ethtool_txq_regs); i++) {
                        snprintf(data, ETH_GSTRING_LEN,
                                 mvpp2_ethtool_txq_regs[i].string, q);
                        data += ETH_GSTRING_LEN;
                }
        }

        for (q = 0; q < port->nrxqs; q++) {
                for (i = 0; i < ARRAY_SIZE(mvpp2_ethtool_rxq_regs); i++) {
                        snprintf(data, ETH_GSTRING_LEN,
                                 mvpp2_ethtool_rxq_regs[i].string,
                                 q);
                        data += ETH_GSTRING_LEN;
                }
        }
}

static void mvpp2_read_stats(struct mvpp2_port *port)
{
        u64 *pstats;
        int i, q;

        pstats = port->ethtool_stats;

        for (i = 0; i < ARRAY_SIZE(mvpp2_ethtool_mib_regs); i++)
                *pstats++ += mvpp2_read_count(port, &mvpp2_ethtool_mib_regs[i]);

        for (i = 0; i < ARRAY_SIZE(mvpp2_ethtool_port_regs); i++)
                *pstats++ += mvpp2_read(port->priv,
                                        mvpp2_ethtool_port_regs[i].offset +
                                        4 * port->id);

        for (q = 0; q < port->ntxqs; q++)
                for (i = 0; i < ARRAY_SIZE(mvpp2_ethtool_txq_regs); i++)
                        *pstats++ += mvpp2_read_index(port->priv,
                                                      MVPP22_CTRS_TX_CTR(port->id, i),
                                                      mvpp2_ethtool_txq_regs[i].offset);

        /* Rxqs are numbered from 0 from the user standpoint, but not from the
         * driver's. We need to add the  port->first_rxq offset.
         */
        for (q = 0; q < port->nrxqs; q++)
                for (i = 0; i < ARRAY_SIZE(mvpp2_ethtool_rxq_regs); i++)
                        *pstats++ += mvpp2_read_index(port->priv,
                                                      port->first_rxq + i,
                                                      mvpp2_ethtool_rxq_regs[i].offset);
}

static void mvpp2_gather_hw_statistics(struct work_struct *work)
{
        struct delayed_work *del_work = to_delayed_work(work);
        struct mvpp2_port *port = container_of(del_work, struct mvpp2_port,
                                               stats_work);

        mutex_lock(&port->gather_stats_lock);

        mvpp2_read_stats(port);

        /* No need to read again the counters right after this function if it
         * was called asynchronously by the user (ie. use of ethtool).
         */
        cancel_delayed_work(&port->stats_work);
        queue_delayed_work(port->priv->stats_queue, &port->stats_work,
                           MVPP2_MIB_COUNTERS_STATS_DELAY);

        mutex_unlock(&port->gather_stats_lock);
}

static void mvpp2_ethtool_get_stats(struct net_device *dev,
                                    struct ethtool_stats *stats, u64 *data)
{
        struct mvpp2_port *port = netdev_priv(dev);

        /* Update statistics for the given port, then take the lock to avoid
         * concurrent accesses on the ethtool_stats structure during its copy.
         */
        mvpp2_gather_hw_statistics(&port->stats_work.work);

        mutex_lock(&port->gather_stats_lock);
        memcpy(data, port->ethtool_stats,
               sizeof(u64) * MVPP2_N_ETHTOOL_STATS(port->ntxqs, port->nrxqs));
        mutex_unlock(&port->gather_stats_lock);
}

static int mvpp2_ethtool_get_sset_count(struct net_device *dev, int sset)
{
        struct mvpp2_port *port = netdev_priv(dev);

        if (sset == ETH_SS_STATS)
                return MVPP2_N_ETHTOOL_STATS(port->ntxqs, port->nrxqs);

        return -EOPNOTSUPP;
}

static void mvpp2_mac_reset_assert(struct mvpp2_port *port)
{
        u32 val;

        val = readl(port->base + MVPP2_GMAC_CTRL_2_REG) |
              MVPP2_GMAC_PORT_RESET_MASK;
        writel(val, port->base + MVPP2_GMAC_CTRL_2_REG);

        if (port->priv->hw_version == MVPP22 && port->gop_id == 0) {
                val = readl(port->base + MVPP22_XLG_CTRL0_REG) &
                      ~MVPP22_XLG_CTRL0_MAC_RESET_DIS;
                writel(val, port->base + MVPP22_XLG_CTRL0_REG);
        }
}

static void mvpp22_pcs_reset_assert(struct mvpp2_port *port)
{
        struct mvpp2 *priv = port->priv;
        void __iomem *mpcs, *xpcs;
        u32 val;

        if (port->priv->hw_version != MVPP22 || port->gop_id != 0)
                return;

        mpcs = priv->iface_base + MVPP22_MPCS_BASE(port->gop_id);
        xpcs = priv->iface_base + MVPP22_XPCS_BASE(port->gop_id);

        val = readl(mpcs + MVPP22_MPCS_CLK_RESET);
        val &= ~(MAC_CLK_RESET_MAC | MAC_CLK_RESET_SD_RX | MAC_CLK_RESET_SD_TX);
        val |= MVPP22_MPCS_CLK_RESET_DIV_SET;
        writel(val, mpcs + MVPP22_MPCS_CLK_RESET);

        val = readl(xpcs + MVPP22_XPCS_CFG0);
        writel(val & ~MVPP22_XPCS_CFG0_RESET_DIS, xpcs + MVPP22_XPCS_CFG0);
}

static void mvpp22_pcs_reset_deassert(struct mvpp2_port *port)
{
        struct mvpp2 *priv = port->priv;
        void __iomem *mpcs, *xpcs;
        u32 val;

        if (port->priv->hw_version != MVPP22 || port->gop_id != 0)
                return;

        mpcs = priv->iface_base + MVPP22_MPCS_BASE(port->gop_id);
        xpcs = priv->iface_base + MVPP22_XPCS_BASE(port->gop_id);

        switch (port->phy_interface) {
        case PHY_INTERFACE_MODE_10GBASER:
                val = readl(mpcs + MVPP22_MPCS_CLK_RESET);
                val |= MAC_CLK_RESET_MAC | MAC_CLK_RESET_SD_RX |
                       MAC_CLK_RESET_SD_TX;
                val &= ~MVPP22_MPCS_CLK_RESET_DIV_SET;
                writel(val, mpcs + MVPP22_MPCS_CLK_RESET);
                break;
        case PHY_INTERFACE_MODE_XAUI:
        case PHY_INTERFACE_MODE_RXAUI:
                val = readl(xpcs + MVPP22_XPCS_CFG0);
                writel(val | MVPP22_XPCS_CFG0_RESET_DIS, xpcs + MVPP22_XPCS_CFG0);
                break;
        default:
                break;
        }
}

/* Change maximum receive size of the port */
static inline void mvpp2_gmac_max_rx_size_set(struct mvpp2_port *port)
{
        u32 val;

        val = readl(port->base + MVPP2_GMAC_CTRL_0_REG);
        val &= ~MVPP2_GMAC_MAX_RX_SIZE_MASK;
        val |= (((port->pkt_size - MVPP2_MH_SIZE) / 2) <<
                    MVPP2_GMAC_MAX_RX_SIZE_OFFS);
        writel(val, port->base + MVPP2_GMAC_CTRL_0_REG);
}

/* Change maximum receive size of the port */
static inline void mvpp2_xlg_max_rx_size_set(struct mvpp2_port *port)
{
        u32 val;

        val =  readl(port->base + MVPP22_XLG_CTRL1_REG);
        val &= ~MVPP22_XLG_CTRL1_FRAMESIZELIMIT_MASK;
        val |= ((port->pkt_size - MVPP2_MH_SIZE) / 2) <<
               MVPP22_XLG_CTRL1_FRAMESIZELIMIT_OFFS;
        writel(val, port->base + MVPP22_XLG_CTRL1_REG);
}

/* Set defaults to the MVPP2 port */
static void mvpp2_defaults_set(struct mvpp2_port *port)
{
        int tx_port_num, val, queue, lrxq;

        if (port->priv->hw_version == MVPP21) {
                /* Update TX FIFO MIN Threshold */
                val = readl(port->base + MVPP2_GMAC_PORT_FIFO_CFG_1_REG);
                val &= ~MVPP2_GMAC_TX_FIFO_MIN_TH_ALL_MASK;
                /* Min. TX threshold must be less than minimal packet length */
                val |= MVPP2_GMAC_TX_FIFO_MIN_TH_MASK(64 - 4 - 2);
                writel(val, port->base + MVPP2_GMAC_PORT_FIFO_CFG_1_REG);
        }

        /* Disable Legacy WRR, Disable EJP, Release from reset */
        tx_port_num = mvpp2_egress_port(port);
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_PORT_INDEX_REG,
                    tx_port_num);
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_CMD_1_REG, 0);

        /* Set TXQ scheduling to Round-Robin */
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_FIXED_PRIO_REG, 0);

        /* Close bandwidth for all queues */
        for (queue = 0; queue < MVPP2_MAX_TXQ; queue++)
                mvpp2_write(port->priv,
                            MVPP2_TXQ_SCHED_TOKEN_CNTR_REG(queue), 0);

        /* Set refill period to 1 usec, refill tokens
         * and bucket size to maximum
         */
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_PERIOD_REG,
                    port->priv->tclk / USEC_PER_SEC);
        val = mvpp2_read(port->priv, MVPP2_TXP_SCHED_REFILL_REG);
        val &= ~MVPP2_TXP_REFILL_PERIOD_ALL_MASK;
        val |= MVPP2_TXP_REFILL_PERIOD_MASK(1);
        val |= MVPP2_TXP_REFILL_TOKENS_ALL_MASK;
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_REFILL_REG, val);
        val = MVPP2_TXP_TOKEN_SIZE_MAX;
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_TOKEN_SIZE_REG, val);

        /* Set MaximumLowLatencyPacketSize value to 256 */
        mvpp2_write(port->priv, MVPP2_RX_CTRL_REG(port->id),
                    MVPP2_RX_USE_PSEUDO_FOR_CSUM_MASK |
                    MVPP2_RX_LOW_LATENCY_PKT_SIZE(256));

        /* Enable Rx cache snoop */
        for (lrxq = 0; lrxq < port->nrxqs; lrxq++) {
                queue = port->rxqs[lrxq]->id;
                val = mvpp2_read(port->priv, MVPP2_RXQ_CONFIG_REG(queue));
                val |= MVPP2_SNOOP_PKT_SIZE_MASK |
                           MVPP2_SNOOP_BUF_HDR_MASK;
                mvpp2_write(port->priv, MVPP2_RXQ_CONFIG_REG(queue), val);
        }

        /* At default, mask all interrupts to all present cpus */
        mvpp2_interrupts_disable(port);
}

/* Enable/disable receiving packets */
static void mvpp2_ingress_enable(struct mvpp2_port *port)
{
        u32 val;
        int lrxq, queue;

        for (lrxq = 0; lrxq < port->nrxqs; lrxq++) {
                queue = port->rxqs[lrxq]->id;
                val = mvpp2_read(port->priv, MVPP2_RXQ_CONFIG_REG(queue));
                val &= ~MVPP2_RXQ_DISABLE_MASK;
                mvpp2_write(port->priv, MVPP2_RXQ_CONFIG_REG(queue), val);
        }
}

static void mvpp2_ingress_disable(struct mvpp2_port *port)
{
        u32 val;
        int lrxq, queue;

        for (lrxq = 0; lrxq < port->nrxqs; lrxq++) {
                queue = port->rxqs[lrxq]->id;
                val = mvpp2_read(port->priv, MVPP2_RXQ_CONFIG_REG(queue));
                val |= MVPP2_RXQ_DISABLE_MASK;
                mvpp2_write(port->priv, MVPP2_RXQ_CONFIG_REG(queue), val);
        }
}

/* Enable transmit via physical egress queue
 * - HW starts take descriptors from DRAM
 */
static void mvpp2_egress_enable(struct mvpp2_port *port)
{
        u32 qmap;
        int queue;
        int tx_port_num = mvpp2_egress_port(port);

        /* Enable all initialized TXs. */
        qmap = 0;
        for (queue = 0; queue < port->ntxqs; queue++) {
                struct mvpp2_tx_queue *txq = port->txqs[queue];

                if (txq->descs)
                        qmap |= (1 << queue);
        }

        mvpp2_write(port->priv, MVPP2_TXP_SCHED_PORT_INDEX_REG, tx_port_num);
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_Q_CMD_REG, qmap);
}

/* Disable transmit via physical egress queue
 * - HW doesn't take descriptors from DRAM
 */
static void mvpp2_egress_disable(struct mvpp2_port *port)
{
        u32 reg_data;
        int delay;
        int tx_port_num = mvpp2_egress_port(port);

        /* Issue stop command for active channels only */
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_PORT_INDEX_REG, tx_port_num);
        reg_data = (mvpp2_read(port->priv, MVPP2_TXP_SCHED_Q_CMD_REG)) &
                    MVPP2_TXP_SCHED_ENQ_MASK;
        if (reg_data != 0)
                mvpp2_write(port->priv, MVPP2_TXP_SCHED_Q_CMD_REG,
                            (reg_data << MVPP2_TXP_SCHED_DISQ_OFFSET));

        /* Wait for all Tx activity to terminate. */
        delay = 0;
        do {
                if (delay >= MVPP2_TX_DISABLE_TIMEOUT_MSEC) {
                        netdev_warn(port->dev,
                                    "Tx stop timed out, status=0x%08x\n",
                                    reg_data);
                        break;
                }
                mdelay(1);
                delay++;

                /* Check port TX Command register that all
                 * Tx queues are stopped
                 */
                reg_data = mvpp2_read(port->priv, MVPP2_TXP_SCHED_Q_CMD_REG);
        } while (reg_data & MVPP2_TXP_SCHED_ENQ_MASK);
}

/* Rx descriptors helper methods */

/* Get number of Rx descriptors occupied by received packets */
static inline int
mvpp2_rxq_received(struct mvpp2_port *port, int rxq_id)
{
        u32 val = mvpp2_read(port->priv, MVPP2_RXQ_STATUS_REG(rxq_id));

        return val & MVPP2_RXQ_OCCUPIED_MASK;
}

/* Update Rx queue status with the number of occupied and available
 * Rx descriptor slots.
 */
static inline void
mvpp2_rxq_status_update(struct mvpp2_port *port, int rxq_id,
                        int used_count, int free_count)
{
        /* Decrement the number of used descriptors and increment count
         * increment the number of free descriptors.
         */
        u32 val = used_count | (free_count << MVPP2_RXQ_NUM_NEW_OFFSET);

        mvpp2_write(port->priv, MVPP2_RXQ_STATUS_UPDATE_REG(rxq_id), val);
}

/* Get pointer to next RX descriptor to be processed by SW */
static inline struct mvpp2_rx_desc *
mvpp2_rxq_next_desc_get(struct mvpp2_rx_queue *rxq)
{
        int rx_desc = rxq->next_desc_to_proc;

        rxq->next_desc_to_proc = MVPP2_QUEUE_NEXT_DESC(rxq, rx_desc);
        prefetch(rxq->descs + rxq->next_desc_to_proc);
        return rxq->descs + rx_desc;
}

/* Set rx queue offset */
static void mvpp2_rxq_offset_set(struct mvpp2_port *port,
                                 int prxq, int offset)
{
        u32 val;

        /* Convert offset from bytes to units of 32 bytes */
        offset = offset >> 5;

        val = mvpp2_read(port->priv, MVPP2_RXQ_CONFIG_REG(prxq));
        val &= ~MVPP2_RXQ_PACKET_OFFSET_MASK;

        /* Offset is in */
        val |= ((offset << MVPP2_RXQ_PACKET_OFFSET_OFFS) &
                    MVPP2_RXQ_PACKET_OFFSET_MASK);

        mvpp2_write(port->priv, MVPP2_RXQ_CONFIG_REG(prxq), val);
}

/* Tx descriptors helper methods */

/* Get pointer to next Tx descriptor to be processed (send) by HW */
static struct mvpp2_tx_desc *
mvpp2_txq_next_desc_get(struct mvpp2_tx_queue *txq)
{
        int tx_desc = txq->next_desc_to_proc;

        txq->next_desc_to_proc = MVPP2_QUEUE_NEXT_DESC(txq, tx_desc);
        return txq->descs + tx_desc;
}

/* Update HW with number of aggregated Tx descriptors to be sent
 *
 * Called only from mvpp2_tx(), so migration is disabled, using
 * smp_processor_id() is OK.
 */
static void mvpp2_aggr_txq_pend_desc_add(struct mvpp2_port *port, int pending)
{
        /* aggregated access - relevant TXQ number is written in TX desc */
        mvpp2_thread_write(port->priv,
                           mvpp2_cpu_to_thread(port->priv, smp_processor_id()),
                           MVPP2_AGGR_TXQ_UPDATE_REG, pending);
}

/* Check if there are enough free descriptors in aggregated txq.
 * If not, update the number of occupied descriptors and repeat the check.
 *
 * Called only from mvpp2_tx(), so migration is disabled, using
 * smp_processor_id() is OK.
 */
static int mvpp2_aggr_desc_num_check(struct mvpp2_port *port,
                                     struct mvpp2_tx_queue *aggr_txq, int num)
{
        if ((aggr_txq->count + num) > MVPP2_AGGR_TXQ_SIZE) {
                /* Update number of occupied aggregated Tx descriptors */
                unsigned int thread =
                        mvpp2_cpu_to_thread(port->priv, smp_processor_id());
                u32 val = mvpp2_read_relaxed(port->priv,
                                             MVPP2_AGGR_TXQ_STATUS_REG(thread));

                aggr_txq->count = val & MVPP2_AGGR_TXQ_PENDING_MASK;

                if ((aggr_txq->count + num) > MVPP2_AGGR_TXQ_SIZE)
                        return -ENOMEM;
        }
        return 0;
}

/* Reserved Tx descriptors allocation request
 *
 * Called only from mvpp2_txq_reserved_desc_num_proc(), itself called
 * only by mvpp2_tx(), so migration is disabled, using
 * smp_processor_id() is OK.
 */
static int mvpp2_txq_alloc_reserved_desc(struct mvpp2_port *port,
                                         struct mvpp2_tx_queue *txq, int num)
{
        unsigned int thread = mvpp2_cpu_to_thread(port->priv, smp_processor_id());
        struct mvpp2 *priv = port->priv;
        u32 val;

        val = (txq->id << MVPP2_TXQ_RSVD_REQ_Q_OFFSET) | num;
        mvpp2_thread_write_relaxed(priv, thread, MVPP2_TXQ_RSVD_REQ_REG, val);

        val = mvpp2_thread_read_relaxed(priv, thread, MVPP2_TXQ_RSVD_RSLT_REG);

        return val & MVPP2_TXQ_RSVD_RSLT_MASK;
}

/* Check if there are enough reserved descriptors for transmission.
 * If not, request chunk of reserved descriptors and check again.
 */
static int mvpp2_txq_reserved_desc_num_proc(struct mvpp2_port *port,
                                            struct mvpp2_tx_queue *txq,
                                            struct mvpp2_txq_pcpu *txq_pcpu,
                                            int num)
{
        int req, desc_count;
        unsigned int thread;

        if (txq_pcpu->reserved_num >= num)
                return 0;

        /* Not enough descriptors reserved! Update the reserved descriptor
         * count and check again.
         */

        desc_count = 0;
        /* Compute total of used descriptors */
        for (thread = 0; thread < port->priv->nthreads; thread++) {
                struct mvpp2_txq_pcpu *txq_pcpu_aux;

                txq_pcpu_aux = per_cpu_ptr(txq->pcpu, thread);
                desc_count += txq_pcpu_aux->count;
                desc_count += txq_pcpu_aux->reserved_num;
        }

        req = max(MVPP2_CPU_DESC_CHUNK, num - txq_pcpu->reserved_num);
        desc_count += req;

        if (desc_count >
           (txq->size - (MVPP2_MAX_THREADS * MVPP2_CPU_DESC_CHUNK)))
                return -ENOMEM;

        txq_pcpu->reserved_num += mvpp2_txq_alloc_reserved_desc(port, txq, req);

        /* OK, the descriptor could have been updated: check again. */

        if (txq_pcpu->reserved_num < num)
                return -ENOMEM;
        return 0;
}

/* Release the last allocated Tx descriptor. Useful to handle DMA
 * mapping failures in the Tx path.
 */
static void mvpp2_txq_desc_put(struct mvpp2_tx_queue *txq)
{
        if (txq->next_desc_to_proc == 0)
                txq->next_desc_to_proc = txq->last_desc - 1;
        else
                txq->next_desc_to_proc--;
}

/* Set Tx descriptors fields relevant for CSUM calculation */
static u32 mvpp2_txq_desc_csum(int l3_offs, __be16 l3_proto,
                               int ip_hdr_len, int l4_proto)
{
        u32 command;

        /* fields: L3_offset, IP_hdrlen, L3_type, G_IPv4_chk,
         * G_L4_chk, L4_type required only for checksum calculation
         */
        command = (l3_offs << MVPP2_TXD_L3_OFF_SHIFT);
        command |= (ip_hdr_len << MVPP2_TXD_IP_HLEN_SHIFT);
        command |= MVPP2_TXD_IP_CSUM_DISABLE;

        if (l3_proto == htons(ETH_P_IP)) {
                command &= ~MVPP2_TXD_IP_CSUM_DISABLE;  /* enable IPv4 csum */
                command &= ~MVPP2_TXD_L3_IP6;           /* enable IPv4 */
        } else {
                command |= MVPP2_TXD_L3_IP6;            /* enable IPv6 */
        }

        if (l4_proto == IPPROTO_TCP) {
                command &= ~MVPP2_TXD_L4_UDP;           /* enable TCP */
                command &= ~MVPP2_TXD_L4_CSUM_FRAG;     /* generate L4 csum */
        } else if (l4_proto == IPPROTO_UDP) {
                command |= MVPP2_TXD_L4_UDP;            /* enable UDP */
                command &= ~MVPP2_TXD_L4_CSUM_FRAG;     /* generate L4 csum */
        } else {
                command |= MVPP2_TXD_L4_CSUM_NOT;
        }

        return command;
}

/* Get number of sent descriptors and decrement counter.
 * The number of sent descriptors is returned.
 * Per-thread access
 *
 * Called only from mvpp2_txq_done(), called from mvpp2_tx()
 * (migration disabled) and from the TX completion tasklet (migration
 * disabled) so using smp_processor_id() is OK.
 */
static inline int mvpp2_txq_sent_desc_proc(struct mvpp2_port *port,
                                           struct mvpp2_tx_queue *txq)
{
        u32 val;

        /* Reading status reg resets transmitted descriptor counter */
        val = mvpp2_thread_read_relaxed(port->priv,
                                        mvpp2_cpu_to_thread(port->priv, smp_processor_id()),
                                        MVPP2_TXQ_SENT_REG(txq->id));

        return (val & MVPP2_TRANSMITTED_COUNT_MASK) >>
                MVPP2_TRANSMITTED_COUNT_OFFSET;
}

/* Called through on_each_cpu(), so runs on all CPUs, with migration
 * disabled, therefore using smp_processor_id() is OK.
 */
static void mvpp2_txq_sent_counter_clear(void *arg)
{
        struct mvpp2_port *port = arg;
        int queue;

        /* If the thread isn't used, don't do anything */
        if (smp_processor_id() > port->priv->nthreads)
                return;

        for (queue = 0; queue < port->ntxqs; queue++) {
                int id = port->txqs[queue]->id;

                mvpp2_thread_read(port->priv,
                                  mvpp2_cpu_to_thread(port->priv, smp_processor_id()),
                                  MVPP2_TXQ_SENT_REG(id));
        }
}

/* Set max sizes for Tx queues */
static void mvpp2_txp_max_tx_size_set(struct mvpp2_port *port)
{
        u32     val, size, mtu;
        int     txq, tx_port_num;

        mtu = port->pkt_size * 8;
        if (mtu > MVPP2_TXP_MTU_MAX)
                mtu = MVPP2_TXP_MTU_MAX;

        /* WA for wrong Token bucket update: Set MTU value = 3*real MTU value */
        mtu = 3 * mtu;

        /* Indirect access to registers */
        tx_port_num = mvpp2_egress_port(port);
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_PORT_INDEX_REG, tx_port_num);

        /* Set MTU */
        val = mvpp2_read(port->priv, MVPP2_TXP_SCHED_MTU_REG);
        val &= ~MVPP2_TXP_MTU_MAX;
        val |= mtu;
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_MTU_REG, val);

        /* TXP token size and all TXQs token size must be larger that MTU */
        val = mvpp2_read(port->priv, MVPP2_TXP_SCHED_TOKEN_SIZE_REG);
        size = val & MVPP2_TXP_TOKEN_SIZE_MAX;
        if (size < mtu) {
                size = mtu;
                val &= ~MVPP2_TXP_TOKEN_SIZE_MAX;
                val |= size;
                mvpp2_write(port->priv, MVPP2_TXP_SCHED_TOKEN_SIZE_REG, val);
        }

        for (txq = 0; txq < port->ntxqs; txq++) {
                val = mvpp2_read(port->priv,
                                 MVPP2_TXQ_SCHED_TOKEN_SIZE_REG(txq));
                size = val & MVPP2_TXQ_TOKEN_SIZE_MAX;

                if (size < mtu) {
                        size = mtu;
                        val &= ~MVPP2_TXQ_TOKEN_SIZE_MAX;
                        val |= size;
                        mvpp2_write(port->priv,
                                    MVPP2_TXQ_SCHED_TOKEN_SIZE_REG(txq),
                                    val);
                }
        }
}

/* Set the number of packets that will be received before Rx interrupt
 * will be generated by HW.
 */
static void mvpp2_rx_pkts_coal_set(struct mvpp2_port *port,
                                   struct mvpp2_rx_queue *rxq)
{
        unsigned int thread = mvpp2_cpu_to_thread(port->priv, get_cpu());

        if (rxq->pkts_coal > MVPP2_OCCUPIED_THRESH_MASK)
                rxq->pkts_coal = MVPP2_OCCUPIED_THRESH_MASK;

        mvpp2_thread_write(port->priv, thread, MVPP2_RXQ_NUM_REG, rxq->id);
        mvpp2_thread_write(port->priv, thread, MVPP2_RXQ_THRESH_REG,
                           rxq->pkts_coal);

        put_cpu();
}

/* For some reason in the LSP this is done on each CPU. Why ? */
static void mvpp2_tx_pkts_coal_set(struct mvpp2_port *port,
                                   struct mvpp2_tx_queue *txq)
{
        unsigned int thread = mvpp2_cpu_to_thread(port->priv, get_cpu());
        u32 val;

        if (txq->done_pkts_coal > MVPP2_TXQ_THRESH_MASK)
                txq->done_pkts_coal = MVPP2_TXQ_THRESH_MASK;

        val = (txq->done_pkts_coal << MVPP2_TXQ_THRESH_OFFSET);
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_NUM_REG, txq->id);
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_THRESH_REG, val);

        put_cpu();
}

static u32 mvpp2_usec_to_cycles(u32 usec, unsigned long clk_hz)
{
        u64 tmp = (u64)clk_hz * usec;

        do_div(tmp, USEC_PER_SEC);

        return tmp > U32_MAX ? U32_MAX : tmp;
}

static u32 mvpp2_cycles_to_usec(u32 cycles, unsigned long clk_hz)
{
        u64 tmp = (u64)cycles * USEC_PER_SEC;

        do_div(tmp, clk_hz);

        return tmp > U32_MAX ? U32_MAX : tmp;
}

/* Set the time delay in usec before Rx interrupt */
static void mvpp2_rx_time_coal_set(struct mvpp2_port *port,
                                   struct mvpp2_rx_queue *rxq)
{
        unsigned long freq = port->priv->tclk;
        u32 val = mvpp2_usec_to_cycles(rxq->time_coal, freq);

        if (val > MVPP2_MAX_ISR_RX_THRESHOLD) {
                rxq->time_coal =
                        mvpp2_cycles_to_usec(MVPP2_MAX_ISR_RX_THRESHOLD, freq);

                /* re-evaluate to get actual register value */
                val = mvpp2_usec_to_cycles(rxq->time_coal, freq);
        }

        mvpp2_write(port->priv, MVPP2_ISR_RX_THRESHOLD_REG(rxq->id), val);
}

static void mvpp2_tx_time_coal_set(struct mvpp2_port *port)
{
        unsigned long freq = port->priv->tclk;
        u32 val = mvpp2_usec_to_cycles(port->tx_time_coal, freq);

        if (val > MVPP2_MAX_ISR_TX_THRESHOLD) {
                port->tx_time_coal =
                        mvpp2_cycles_to_usec(MVPP2_MAX_ISR_TX_THRESHOLD, freq);

                /* re-evaluate to get actual register value */
                val = mvpp2_usec_to_cycles(port->tx_time_coal, freq);
        }

        mvpp2_write(port->priv, MVPP2_ISR_TX_THRESHOLD_REG(port->id), val);
}

/* Free Tx queue skbuffs */
static void mvpp2_txq_bufs_free(struct mvpp2_port *port,
                                struct mvpp2_tx_queue *txq,
                                struct mvpp2_txq_pcpu *txq_pcpu, int num)
{
        int i;

        for (i = 0; i < num; i++) {
                struct mvpp2_txq_pcpu_buf *tx_buf =
                        txq_pcpu->buffs + txq_pcpu->txq_get_index;

                if (!IS_TSO_HEADER(txq_pcpu, tx_buf->dma))
                        dma_unmap_single(port->dev->dev.parent, tx_buf->dma,
                                         tx_buf->size, DMA_TO_DEVICE);
                if (tx_buf->skb)
                        dev_kfree_skb_any(tx_buf->skb);

                mvpp2_txq_inc_get(txq_pcpu);
        }
}

static inline struct mvpp2_rx_queue *mvpp2_get_rx_queue(struct mvpp2_port *port,
                                                        u32 cause)
{
        int queue = fls(cause) - 1;

        return port->rxqs[queue];
}

static inline struct mvpp2_tx_queue *mvpp2_get_tx_queue(struct mvpp2_port *port,
                                                        u32 cause)
{
        int queue = fls(cause) - 1;

        return port->txqs[queue];
}

/* Handle end of transmission */
static void mvpp2_txq_done(struct mvpp2_port *port, struct mvpp2_tx_queue *txq,
                           struct mvpp2_txq_pcpu *txq_pcpu)
{
        struct netdev_queue *nq = netdev_get_tx_queue(port->dev, txq->log_id);
        int tx_done;

        if (txq_pcpu->thread != mvpp2_cpu_to_thread(port->priv, smp_processor_id()))
                netdev_err(port->dev, "wrong cpu on the end of Tx processing\n");

        tx_done = mvpp2_txq_sent_desc_proc(port, txq);
        if (!tx_done)
                return;
        mvpp2_txq_bufs_free(port, txq, txq_pcpu, tx_done);

        txq_pcpu->count -= tx_done;

        if (netif_tx_queue_stopped(nq))
                if (txq_pcpu->count <= txq_pcpu->wake_threshold)
                        netif_tx_wake_queue(nq);
}

static unsigned int mvpp2_tx_done(struct mvpp2_port *port, u32 cause,
                                  unsigned int thread)
{
        struct mvpp2_tx_queue *txq;
        struct mvpp2_txq_pcpu *txq_pcpu;
        unsigned int tx_todo = 0;

        while (cause) {
                txq = mvpp2_get_tx_queue(port, cause);
                if (!txq)
                        break;

                txq_pcpu = per_cpu_ptr(txq->pcpu, thread);

                if (txq_pcpu->count) {
                        mvpp2_txq_done(port, txq, txq_pcpu);
                        tx_todo += txq_pcpu->count;
                }

                cause &= ~(1 << txq->log_id);
        }
        return tx_todo;
}

/* Rx/Tx queue initialization/cleanup methods */

/* Allocate and initialize descriptors for aggr TXQ */
static int mvpp2_aggr_txq_init(struct platform_device *pdev,
                               struct mvpp2_tx_queue *aggr_txq,
                               unsigned int thread, struct mvpp2 *priv)
{
        u32 txq_dma;

        /* Allocate memory for TX descriptors */
        aggr_txq->descs = dma_alloc_coherent(&pdev->dev,
                                             MVPP2_AGGR_TXQ_SIZE * MVPP2_DESC_ALIGNED_SIZE,
                                             &aggr_txq->descs_dma, GFP_KERNEL);
        if (!aggr_txq->descs)
                return -ENOMEM;

        aggr_txq->last_desc = MVPP2_AGGR_TXQ_SIZE - 1;

        /* Aggr TXQ no reset WA */
        aggr_txq->next_desc_to_proc = mvpp2_read(priv,
                                                 MVPP2_AGGR_TXQ_INDEX_REG(thread));

        /* Set Tx descriptors queue starting address indirect
         * access
         */
        if (priv->hw_version == MVPP21)
                txq_dma = aggr_txq->descs_dma;
        else
                txq_dma = aggr_txq->descs_dma >>
                        MVPP22_AGGR_TXQ_DESC_ADDR_OFFS;

        mvpp2_write(priv, MVPP2_AGGR_TXQ_DESC_ADDR_REG(thread), txq_dma);
        mvpp2_write(priv, MVPP2_AGGR_TXQ_DESC_SIZE_REG(thread),
                    MVPP2_AGGR_TXQ_SIZE);

        return 0;
}

/* Create a specified Rx queue */
static int mvpp2_rxq_init(struct mvpp2_port *port,
                          struct mvpp2_rx_queue *rxq)

{
        unsigned int thread;
        u32 rxq_dma;

        rxq->size = port->rx_ring_size;

        /* Allocate memory for RX descriptors */
        rxq->descs = dma_alloc_coherent(port->dev->dev.parent,
                                        rxq->size * MVPP2_DESC_ALIGNED_SIZE,
                                        &rxq->descs_dma, GFP_KERNEL);
        if (!rxq->descs)
                return -ENOMEM;

        rxq->last_desc = rxq->size - 1;

        /* Zero occupied and non-occupied counters - direct access */
        mvpp2_write(port->priv, MVPP2_RXQ_STATUS_REG(rxq->id), 0);

        /* Set Rx descriptors queue starting address - indirect access */
        thread = mvpp2_cpu_to_thread(port->priv, get_cpu());
        mvpp2_thread_write(port->priv, thread, MVPP2_RXQ_NUM_REG, rxq->id);
        if (port->priv->hw_version == MVPP21)
                rxq_dma = rxq->descs_dma;
        else
                rxq_dma = rxq->descs_dma >> MVPP22_DESC_ADDR_OFFS;
        mvpp2_thread_write(port->priv, thread, MVPP2_RXQ_DESC_ADDR_REG, rxq_dma);
        mvpp2_thread_write(port->priv, thread, MVPP2_RXQ_DESC_SIZE_REG, rxq->size);
        mvpp2_thread_write(port->priv, thread, MVPP2_RXQ_INDEX_REG, 0);
        put_cpu();

        /* Set Offset */
        mvpp2_rxq_offset_set(port, rxq->id, NET_SKB_PAD);

        /* Set coalescing pkts and time */
        mvpp2_rx_pkts_coal_set(port, rxq);
        mvpp2_rx_time_coal_set(port, rxq);

        /* Add number of descriptors ready for receiving packets */
        mvpp2_rxq_status_update(port, rxq->id, 0, rxq->size);

        return 0;
}

/* Push packets received by the RXQ to BM pool */
static void mvpp2_rxq_drop_pkts(struct mvpp2_port *port,
                                struct mvpp2_rx_queue *rxq)
{
        int rx_received, i;

        rx_received = mvpp2_rxq_received(port, rxq->id);
        if (!rx_received)
                return;

        for (i = 0; i < rx_received; i++) {
                struct mvpp2_rx_desc *rx_desc = mvpp2_rxq_next_desc_get(rxq);
                u32 status = mvpp2_rxdesc_status_get(port, rx_desc);
                int pool;

                pool = (status & MVPP2_RXD_BM_POOL_ID_MASK) >>
                        MVPP2_RXD_BM_POOL_ID_OFFS;

                mvpp2_bm_pool_put(port, pool,
                                  mvpp2_rxdesc_dma_addr_get(port, rx_desc),
                                  mvpp2_rxdesc_cookie_get(port, rx_desc));
        }
        mvpp2_rxq_status_update(port, rxq->id, rx_received, rx_received);
}

/* Cleanup Rx queue */
static void mvpp2_rxq_deinit(struct mvpp2_port *port,
                             struct mvpp2_rx_queue *rxq)
{
        unsigned int thread;

        mvpp2_rxq_drop_pkts(port, rxq);

        if (rxq->descs)
                dma_free_coherent(port->dev->dev.parent,
                                  rxq->size * MVPP2_DESC_ALIGNED_SIZE,
                                  rxq->descs,
                                  rxq->descs_dma);

        rxq->descs             = NULL;
        rxq->last_desc         = 0;
        rxq->next_desc_to_proc = 0;
        rxq->descs_dma         = 0;

        /* Clear Rx descriptors queue starting address and size;
         * free descriptor number
         */
        mvpp2_write(port->priv, MVPP2_RXQ_STATUS_REG(rxq->id), 0);
        thread = mvpp2_cpu_to_thread(port->priv, get_cpu());
        mvpp2_thread_write(port->priv, thread, MVPP2_RXQ_NUM_REG, rxq->id);
        mvpp2_thread_write(port->priv, thread, MVPP2_RXQ_DESC_ADDR_REG, 0);
        mvpp2_thread_write(port->priv, thread, MVPP2_RXQ_DESC_SIZE_REG, 0);
        put_cpu();
}

/* Create and initialize a Tx queue */
static int mvpp2_txq_init(struct mvpp2_port *port,
                          struct mvpp2_tx_queue *txq)
{
        u32 val;
        unsigned int thread;
        int desc, desc_per_txq, tx_port_num;
        struct mvpp2_txq_pcpu *txq_pcpu;

        txq->size = port->tx_ring_size;

        /* Allocate memory for Tx descriptors */
        txq->descs = dma_alloc_coherent(port->dev->dev.parent,
                                txq->size * MVPP2_DESC_ALIGNED_SIZE,
                                &txq->descs_dma, GFP_KERNEL);
        if (!txq->descs)
                return -ENOMEM;

        txq->last_desc = txq->size - 1;

        /* Set Tx descriptors queue starting address - indirect access */
        thread = mvpp2_cpu_to_thread(port->priv, get_cpu());
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_NUM_REG, txq->id);
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_DESC_ADDR_REG,
                           txq->descs_dma);
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_DESC_SIZE_REG,
                           txq->size & MVPP2_TXQ_DESC_SIZE_MASK);
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_INDEX_REG, 0);
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_RSVD_CLR_REG,
                           txq->id << MVPP2_TXQ_RSVD_CLR_OFFSET);
        val = mvpp2_thread_read(port->priv, thread, MVPP2_TXQ_PENDING_REG);
        val &= ~MVPP2_TXQ_PENDING_MASK;
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_PENDING_REG, val);

        /* Calculate base address in prefetch buffer. We reserve 16 descriptors
         * for each existing TXQ.
         * TCONTS for PON port must be continuous from 0 to MVPP2_MAX_TCONT
         * GBE ports assumed to be continuous from 0 to MVPP2_MAX_PORTS
         */
        desc_per_txq = 16;
        desc = (port->id * MVPP2_MAX_TXQ * desc_per_txq) +
               (txq->log_id * desc_per_txq);

        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_PREF_BUF_REG,
                           MVPP2_PREF_BUF_PTR(desc) | MVPP2_PREF_BUF_SIZE_16 |
                           MVPP2_PREF_BUF_THRESH(desc_per_txq / 2));
        put_cpu();

        /* WRR / EJP configuration - indirect access */
        tx_port_num = mvpp2_egress_port(port);
        mvpp2_write(port->priv, MVPP2_TXP_SCHED_PORT_INDEX_REG, tx_port_num);

        val = mvpp2_read(port->priv, MVPP2_TXQ_SCHED_REFILL_REG(txq->log_id));
        val &= ~MVPP2_TXQ_REFILL_PERIOD_ALL_MASK;
        val |= MVPP2_TXQ_REFILL_PERIOD_MASK(1);
        val |= MVPP2_TXQ_REFILL_TOKENS_ALL_MASK;
        mvpp2_write(port->priv, MVPP2_TXQ_SCHED_REFILL_REG(txq->log_id), val);

        val = MVPP2_TXQ_TOKEN_SIZE_MAX;
        mvpp2_write(port->priv, MVPP2_TXQ_SCHED_TOKEN_SIZE_REG(txq->log_id),
                    val);

        for (thread = 0; thread < port->priv->nthreads; thread++) {
                txq_pcpu = per_cpu_ptr(txq->pcpu, thread);
                txq_pcpu->size = txq->size;
                txq_pcpu->buffs = kmalloc_array(txq_pcpu->size,
                                                sizeof(*txq_pcpu->buffs),
                                                GFP_KERNEL);
                if (!txq_pcpu->buffs)
                        return -ENOMEM;

                txq_pcpu->count = 0;
                txq_pcpu->reserved_num = 0;
                txq_pcpu->txq_put_index = 0;
                txq_pcpu->txq_get_index = 0;
                txq_pcpu->tso_headers = NULL;

                txq_pcpu->stop_threshold = txq->size - MVPP2_MAX_SKB_DESCS;
                txq_pcpu->wake_threshold = txq_pcpu->stop_threshold / 2;

                txq_pcpu->tso_headers =
                        dma_alloc_coherent(port->dev->dev.parent,
                                           txq_pcpu->size * TSO_HEADER_SIZE,
                                           &txq_pcpu->tso_headers_dma,
                                           GFP_KERNEL);
                if (!txq_pcpu->tso_headers)
                        return -ENOMEM;
        }

        return 0;
}

/* Free allocated TXQ resources */
static void mvpp2_txq_deinit(struct mvpp2_port *port,
                             struct mvpp2_tx_queue *txq)
{
        struct mvpp2_txq_pcpu *txq_pcpu;
        unsigned int thread;

        for (thread = 0; thread < port->priv->nthreads; thread++) {
                txq_pcpu = per_cpu_ptr(txq->pcpu, thread);
                kfree(txq_pcpu->buffs);

                if (txq_pcpu->tso_headers)
                        dma_free_coherent(port->dev->dev.parent,
                                          txq_pcpu->size * TSO_HEADER_SIZE,
                                          txq_pcpu->tso_headers,
                                          txq_pcpu->tso_headers_dma);

                txq_pcpu->tso_headers = NULL;
        }

        if (txq->descs)
                dma_free_coherent(port->dev->dev.parent,
                                  txq->size * MVPP2_DESC_ALIGNED_SIZE,
                                  txq->descs, txq->descs_dma);

        txq->descs             = NULL;
        txq->last_desc         = 0;
        txq->next_desc_to_proc = 0;
        txq->descs_dma         = 0;

        /* Set minimum bandwidth for disabled TXQs */
        mvpp2_write(port->priv, MVPP2_TXQ_SCHED_TOKEN_CNTR_REG(txq->log_id), 0);

        /* Set Tx descriptors queue starting address and size */
        thread = mvpp2_cpu_to_thread(port->priv, get_cpu());
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_NUM_REG, txq->id);
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_DESC_ADDR_REG, 0);
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_DESC_SIZE_REG, 0);
        put_cpu();
}

/* Cleanup Tx ports */
static void mvpp2_txq_clean(struct mvpp2_port *port, struct mvpp2_tx_queue *txq)
{
        struct mvpp2_txq_pcpu *txq_pcpu;
        int delay, pending;
        unsigned int thread = mvpp2_cpu_to_thread(port->priv, get_cpu());
        u32 val;

        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_NUM_REG, txq->id);
        val = mvpp2_thread_read(port->priv, thread, MVPP2_TXQ_PREF_BUF_REG);
        val |= MVPP2_TXQ_DRAIN_EN_MASK;
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_PREF_BUF_REG, val);

        /* The napi queue has been stopped so wait for all packets
         * to be transmitted.
         */
        delay = 0;
        do {
                if (delay >= MVPP2_TX_PENDING_TIMEOUT_MSEC) {
                        netdev_warn(port->dev,
                                    "port %d: cleaning queue %d timed out\n",
                                    port->id, txq->log_id);
                        break;
                }
                mdelay(1);
                delay++;

                pending = mvpp2_thread_read(port->priv, thread,
                                            MVPP2_TXQ_PENDING_REG);
                pending &= MVPP2_TXQ_PENDING_MASK;
        } while (pending);

        val &= ~MVPP2_TXQ_DRAIN_EN_MASK;
        mvpp2_thread_write(port->priv, thread, MVPP2_TXQ_PREF_BUF_REG, val);
        put_cpu();

        for (thread = 0; thread < port->priv->nthreads; thread++) {
                txq_pcpu = per_cpu_ptr(txq->pcpu, thread);

                /* Release all packets */
                mvpp2_txq_bufs_free(port, txq, txq_pcpu, txq_pcpu->count);

                /* Reset queue */
                txq_pcpu->count = 0;
                txq_pcpu->txq_put_index = 0;
                txq_pcpu->txq_get_index = 0;
        }
}

/* Cleanup all Tx queues */
static void mvpp2_cleanup_txqs(struct mvpp2_port *port)
{
        struct mvpp2_tx_queue *txq;
        int queue;
        u32 val;

        val = mvpp2_read(port->priv, MVPP2_TX_PORT_FLUSH_REG);

        /* Reset Tx ports and delete Tx queues */
        val |= MVPP2_TX_PORT_FLUSH_MASK(port->id);
        mvpp2_write(port->priv, MVPP2_TX_PORT_FLUSH_REG, val);

        for (queue = 0; queue < port->ntxqs; queue++) {
                txq = port->txqs[queue];
                mvpp2_txq_clean(port, txq);
                mvpp2_txq_deinit(port, txq);
        }

        on_each_cpu(mvpp2_txq_sent_counter_clear, port, 1);

        val &= ~MVPP2_TX_PORT_FLUSH_MASK(port->id);
        mvpp2_write(port->priv, MVPP2_TX_PORT_FLUSH_REG, val);
}

/* Cleanup all Rx queues */
static void mvpp2_cleanup_rxqs(struct mvpp2_port *port)
{
        int queue;

        for (queue = 0; queue < port->nrxqs; queue++)
                mvpp2_rxq_deinit(port, port->rxqs[queue]);
}

/* Init all Rx queues for port */
static int mvpp2_setup_rxqs(struct mvpp2_port *port)
{
        int queue, err;

        for (queue = 0; queue < port->nrxqs; queue++) {
                err = mvpp2_rxq_init(port, port->rxqs[queue]);
                if (err)
                        goto err_cleanup;
        }
        return 0;

err_cleanup:
        mvpp2_cleanup_rxqs(port);
        return err;
}

/* Init all tx queues for port */
static int mvpp2_setup_txqs(struct mvpp2_port *port)
{
        struct mvpp2_tx_queue *txq;
        int queue, err, cpu;

        for (queue = 0; queue < port->ntxqs; queue++) {
                txq = port->txqs[queue];
                err = mvpp2_txq_init(port, txq);
                if (err)
                        goto err_cleanup;

                /* Assign this queue to a CPU */
                cpu = queue % num_present_cpus();
                netif_set_xps_queue(port->dev, cpumask_of(cpu), queue);
        }

        if (port->has_tx_irqs) {
                mvpp2_tx_time_coal_set(port);
                for (queue = 0; queue < port->ntxqs; queue++) {
                        txq = port->txqs[queue];
                        mvpp2_tx_pkts_coal_set(port, txq);
                }
        }

        on_each_cpu(mvpp2_txq_sent_counter_clear, port, 1);
        return 0;

err_cleanup:
        mvpp2_cleanup_txqs(port);
        return err;
}

/* The callback for per-port interrupt */
static irqreturn_t mvpp2_isr(int irq, void *dev_id)
{
        struct mvpp2_queue_vector *qv = dev_id;

        mvpp2_qvec_interrupt_disable(qv);

        napi_schedule(&qv->napi);

        return IRQ_HANDLED;
}

/* Per-port interrupt for link status changes */
static irqreturn_t mvpp2_link_status_isr(int irq, void *dev_id)
{
        struct mvpp2_port *port = (struct mvpp2_port *)dev_id;
        struct net_device *dev = port->dev;
        bool event = false, link = false;
        u32 val;

        mvpp22_gop_mask_irq(port);

        if (port->gop_id == 0 && mvpp2_is_xlg(port->phy_interface)) {
                val = readl(port->base + MVPP22_XLG_INT_STAT);
                if (val & MVPP22_XLG_INT_STAT_LINK) {
                        event = true;
                        val = readl(port->base + MVPP22_XLG_STATUS);
                        if (val & MVPP22_XLG_STATUS_LINK_UP)
                                link = true;
                }
        } else if (phy_interface_mode_is_rgmii(port->phy_interface) ||
                   phy_interface_mode_is_8023z(port->phy_interface) ||
                   port->phy_interface == PHY_INTERFACE_MODE_SGMII) {
                val = readl(port->base + MVPP22_GMAC_INT_STAT);
                if (val & MVPP22_GMAC_INT_STAT_LINK) {
                        event = true;
                        val = readl(port->base + MVPP2_GMAC_STATUS0);
                        if (val & MVPP2_GMAC_STATUS0_LINK_UP)
                                link = true;
                }
        }

        if (port->phylink) {
                phylink_mac_change(port->phylink, link);
                goto handled;
        }

        if (!netif_running(dev) || !event)
                goto handled;

        if (link) {
                mvpp2_interrupts_enable(port);

                mvpp2_egress_enable(port);
                mvpp2_ingress_enable(port);
                netif_carrier_on(dev);
                netif_tx_wake_all_queues(dev);
        } else {
                netif_tx_stop_all_queues(dev);
                netif_carrier_off(dev);
                mvpp2_ingress_disable(port);
                mvpp2_egress_disable(port);

                mvpp2_interrupts_disable(port);
        }

handled:
        mvpp22_gop_unmask_irq(port);
        return IRQ_HANDLED;
}

static enum hrtimer_restart mvpp2_hr_timer_cb(struct hrtimer *timer)
{
        struct net_device *dev;
        struct mvpp2_port *port;
        struct mvpp2_port_pcpu *port_pcpu;
        unsigned int tx_todo, cause;

        port_pcpu = container_of(timer, struct mvpp2_port_pcpu, tx_done_timer);
        dev = port_pcpu->dev;

        if (!netif_running(dev))
                return HRTIMER_NORESTART;

        port_pcpu->timer_scheduled = false;
        port = netdev_priv(dev);

        /* Process all the Tx queues */
        cause = (1 << port->ntxqs) - 1;
        tx_todo = mvpp2_tx_done(port, cause,
                                mvpp2_cpu_to_thread(port->priv, smp_processor_id()));

        /* Set the timer in case not all the packets were processed */
        if (tx_todo && !port_pcpu->timer_scheduled) {
                port_pcpu->timer_scheduled = true;
                hrtimer_forward_now(&port_pcpu->tx_done_timer,
                                    MVPP2_TXDONE_HRTIMER_PERIOD_NS);

                return HRTIMER_RESTART;
        }
        return HRTIMER_NORESTART;
}

/* Main RX/TX processing routines */

/* Display more error info */
static void mvpp2_rx_error(struct mvpp2_port *port,
                           struct mvpp2_rx_desc *rx_desc)
{
        u32 status = mvpp2_rxdesc_status_get(port, rx_desc);
        size_t sz = mvpp2_rxdesc_size_get(port, rx_desc);
        char *err_str = NULL;

        switch (status & MVPP2_RXD_ERR_CODE_MASK) {
        case MVPP2_RXD_ERR_CRC:
                err_str = "crc";
                break;
        case MVPP2_RXD_ERR_OVERRUN:
                err_str = "overrun";
                break;
        case MVPP2_RXD_ERR_RESOURCE:
                err_str = "resource";
                break;
        }
        if (err_str && net_ratelimit())
                netdev_err(port->dev,
                           "bad rx status %08x (%s error), size=%zu\n",
                           status, err_str, sz);
}

/* Handle RX checksum offload */
static void mvpp2_rx_csum(struct mvpp2_port *port, u32 status,
                          struct sk_buff *skb)
{
        if (((status & MVPP2_RXD_L3_IP4) &&
             !(status & MVPP2_RXD_IP4_HEADER_ERR)) ||
            (status & MVPP2_RXD_L3_IP6))
                if (((status & MVPP2_RXD_L4_UDP) ||
                     (status & MVPP2_RXD_L4_TCP)) &&
                     (status & MVPP2_RXD_L4_CSUM_OK)) {
                        skb->csum = 0;
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                        return;
                }

        skb->ip_summed = CHECKSUM_NONE;
}

/* Allocate a new skb and add it to BM pool */
static int mvpp2_rx_refill(struct mvpp2_port *port,
                           struct mvpp2_bm_pool *bm_pool, int pool)
{
        dma_addr_t dma_addr;
        phys_addr_t phys_addr;
        void *buf;

        buf = mvpp2_buf_alloc(port, bm_pool, &dma_addr, &phys_addr,
                              GFP_ATOMIC);
        if (!buf)
                return -ENOMEM;

        mvpp2_bm_pool_put(port, pool, dma_addr, phys_addr);

        return 0;
}

/* Handle tx checksum */
static u32 mvpp2_skb_tx_csum(struct mvpp2_port *port, struct sk_buff *skb)
{
        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                int ip_hdr_len = 0;
                u8 l4_proto;
                __be16 l3_proto = vlan_get_protocol(skb);

                if (l3_proto == htons(ETH_P_IP)) {
                        struct iphdr *ip4h = ip_hdr(skb);

                        /* Calculate IPv4 checksum and L4 checksum */
                        ip_hdr_len = ip4h->ihl;
                        l4_proto = ip4h->protocol;
                } else if (l3_proto == htons(ETH_P_IPV6)) {
                        struct ipv6hdr *ip6h = ipv6_hdr(skb);

                        /* Read l4_protocol from one of IPv6 extra headers */
                        if (skb_network_header_len(skb) > 0)
                                ip_hdr_len = (skb_network_header_len(skb) >> 2);
                        l4_proto = ip6h->nexthdr;
                } else {
                        return MVPP2_TXD_L4_CSUM_NOT;
                }

                return mvpp2_txq_desc_csum(skb_network_offset(skb),
                                           l3_proto, ip_hdr_len, l4_proto);
        }

        return MVPP2_TXD_L4_CSUM_NOT | MVPP2_TXD_IP_CSUM_DISABLE;
}

/* Main rx processing */
static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
                    int rx_todo, struct mvpp2_rx_queue *rxq)
{
        struct net_device *dev = port->dev;
        int rx_received;
        int rx_done = 0;
        u32 rcvd_pkts = 0;
        u32 rcvd_bytes = 0;

        /* Get number of received packets and clamp the to-do */
        rx_received = mvpp2_rxq_received(port, rxq->id);
        if (rx_todo > rx_received)
                rx_todo = rx_received;

        while (rx_done < rx_todo) {
                struct mvpp2_rx_desc *rx_desc = mvpp2_rxq_next_desc_get(rxq);
                struct mvpp2_bm_pool *bm_pool;
                struct sk_buff *skb;
                unsigned int frag_size;
                dma_addr_t dma_addr;
                phys_addr_t phys_addr;
                u32 rx_status;
                int pool, rx_bytes, err;
                void *data;

                rx_done++;
                rx_status = mvpp2_rxdesc_status_get(port, rx_desc);
                rx_bytes = mvpp2_rxdesc_size_get(port, rx_desc);
                rx_bytes -= MVPP2_MH_SIZE;
                dma_addr = mvpp2_rxdesc_dma_addr_get(port, rx_desc);
                phys_addr = mvpp2_rxdesc_cookie_get(port, rx_desc);
                data = (void *)phys_to_virt(phys_addr);

                pool = (rx_status & MVPP2_RXD_BM_POOL_ID_MASK) >>
                        MVPP2_RXD_BM_POOL_ID_OFFS;
                bm_pool = &port->priv->bm_pools[pool];

                /* In case of an error, release the requested buffer pointer
                 * to the Buffer Manager. This request process is controlled
                 * by the hardware, and the information about the buffer is
                 * comprised by the RX descriptor.
                 */
                if (rx_status & MVPP2_RXD_ERR_SUMMARY)
                        goto err_drop_frame;

                dma_sync_single_for_cpu(dev->dev.parent, dma_addr,
                                        rx_bytes + MVPP2_MH_SIZE,
                                        DMA_FROM_DEVICE);
                prefetch(data);

                if (bm_pool->frag_size > PAGE_SIZE)
                        frag_size = 0;
                else
                        frag_size = bm_pool->frag_size;

                skb = build_skb(data, frag_size);
                if (!skb) {
                        netdev_warn(port->dev, "skb build failed\n");
                        goto err_drop_frame;
                }

                err = mvpp2_rx_refill(port, bm_pool, pool);
                if (err) {
                        netdev_err(port->dev, "failed to refill BM pools\n");
                        goto err_drop_frame;
                }

                dma_unmap_single_attrs(dev->dev.parent, dma_addr,
                                       bm_pool->buf_size, DMA_FROM_DEVICE,
                                       DMA_ATTR_SKIP_CPU_SYNC);

                rcvd_pkts++;
                rcvd_bytes += rx_bytes;

                skb_reserve(skb, MVPP2_MH_SIZE + NET_SKB_PAD);
                skb_put(skb, rx_bytes);
                skb->protocol = eth_type_trans(skb, dev);
                mvpp2_rx_csum(port, rx_status, skb);

                napi_gro_receive(napi, skb);
                continue;

err_drop_frame:
                dev->stats.rx_errors++;