// SPDX-License-Identifier: GPL-2.0
/* Renesas Ethernet Switch device driver
 *
 * Copyright (C) 2022-2025 Renesas Electronics Corporation
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/ip.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/net_tstamp.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/sys_soc.h>

#include "rswitch.h"
#include "rswitch_l2.h"

#define RSWITCH_GPTP_OFFSET_S4 0x00018000

static int rswitch_reg_wait(void __iomem *addr, u32 offs, u32 mask, u32 expected)
{
        u32 val;

        return readl_poll_timeout_atomic(addr + offs, val, (val & mask) == expected,
                                         1, RSWITCH_TIMEOUT_US);
}

void rswitch_modify(void __iomem *addr, enum rswitch_reg reg, u32 clear, u32 set)
{
        iowrite32((ioread32(addr + reg) & ~clear) | set, addr + reg);
}

/* Common Agent block (COMA) */
static void rswitch_reset(struct rswitch_private *priv)
{
        iowrite32(RRC_RR, priv->addr + RRC);
        iowrite32(RRC_RR_CLR, priv->addr + RRC);
}

static void rswitch_clock_enable(struct rswitch_private *priv)
{
        iowrite32(RCEC_ACE_DEFAULT | RCEC_RCE, priv->addr + RCEC);
}

static void rswitch_clock_disable(struct rswitch_private *priv)
{
        iowrite32(RCDC_RCD, priv->addr + RCDC);
}

static bool rswitch_agent_clock_is_enabled(void __iomem *coma_addr,
                                           unsigned int port)
{
        u32 val = ioread32(coma_addr + RCEC);

        if (val & RCEC_RCE)
                return (val & BIT(port)) ? true : false;
        else
                return false;
}

static void rswitch_agent_clock_ctrl(void __iomem *coma_addr, unsigned int port,
                                     int enable)
{
        u32 val;

        if (enable) {
                val = ioread32(coma_addr + RCEC);
                iowrite32(val | RCEC_RCE | BIT(port), coma_addr + RCEC);
        } else {
                val = ioread32(coma_addr + RCDC);
                iowrite32(val | BIT(port), coma_addr + RCDC);
        }
}

static int rswitch_bpool_config(struct rswitch_private *priv)
{
        u32 val;

        val = ioread32(priv->addr + CABPIRM);
        if (val & CABPIRM_BPR)
                return 0;

        iowrite32(CABPIRM_BPIOG, priv->addr + CABPIRM);

        return rswitch_reg_wait(priv->addr, CABPIRM, CABPIRM_BPR, CABPIRM_BPR);
}

static void rswitch_coma_init(struct rswitch_private *priv)
{
        iowrite32(CABPPFLC_INIT_VALUE, priv->addr + CABPPFLC0);
}

/* R-Switch-2 block (TOP) */
static void rswitch_top_init(struct rswitch_private *priv)
{
        unsigned int i;

        for (i = 0; i < RSWITCH_MAX_NUM_QUEUES; i++)
                iowrite32((i / 16) << (GWCA_INDEX * 8), priv->addr + TPEMIMC7(i));
}

/* Forwarding engine block (MFWD) */
static int rswitch_fwd_init(struct rswitch_private *priv)
{
        u32 all_ports_mask = GENMASK(RSWITCH_NUM_AGENTS - 1, 0);
        unsigned int i;
        u32 reg_val;

        /* Start with empty configuration */
        for (i = 0; i < RSWITCH_NUM_AGENTS; i++) {
                /* Disable all port features */
                iowrite32(0, priv->addr + FWPC0(i));
                /* Disallow L3 forwarding and direct descriptor forwarding */
                iowrite32(FIELD_PREP(FWCP1_LTHFW, all_ports_mask),
                          priv->addr + FWPC1(i));
                /* Disallow L2 forwarding */
                iowrite32(FIELD_PREP(FWCP2_LTWFW, all_ports_mask),
                          priv->addr + FWPC2(i));
                /* Disallow port based forwarding */
                iowrite32(0, priv->addr + FWPBFC(i));
        }

        /* Configure MAC table aging */
        rswitch_modify(priv->addr, FWMACAGUSPC, FWMACAGUSPC_MACAGUSP,
                       FIELD_PREP(FWMACAGUSPC_MACAGUSP, RSW_AGEING_CLK_PER_US));

        reg_val = FIELD_PREP(FWMACAGC_MACAGT, RSW_AGEING_TIME);
        reg_val |= FWMACAGC_MACAGE | FWMACAGC_MACAGSL;
        iowrite32(reg_val, priv->addr + FWMACAGC);

        /* For enabled ETHA ports, setup port based forwarding */
        rswitch_for_each_enabled_port(priv, i) {
                /* Port based forwarding from port i to GWCA port */
                rswitch_modify(priv->addr, FWPBFC(i), FWPBFC_PBDV,
                               FIELD_PREP(FWPBFC_PBDV, BIT(priv->gwca.index)));
                /* Within GWCA port, forward to Rx queue for port i */
                iowrite32(priv->rdev[i]->rx_queue->index,
                          priv->addr + FWPBFCSDC(GWCA_INDEX, i));
        }

        /* For GWCA port, allow direct descriptor forwarding */
        rswitch_modify(priv->addr, FWPC1(priv->gwca.index), FWPC1_DDE, FWPC1_DDE);

        /* Initialize hardware L2 forwarding table */

        /* Allow entire table to be used for "unsecure" entries */
        rswitch_modify(priv->addr, FWMACHEC, 0, FWMACHEC_MACHMUE_MASK);

        /* Initialize MAC hash table */
        iowrite32(FWMACTIM_MACTIOG, priv->addr + FWMACTIM);

        return rswitch_reg_wait(priv->addr, FWMACTIM, FWMACTIM_MACTIOG, 0);
}

/* Gateway CPU agent block (GWCA) */
static int rswitch_gwca_change_mode(struct rswitch_private *priv,
                                    enum rswitch_gwca_mode mode)
{
        int ret;

        if (!rswitch_agent_clock_is_enabled(priv->addr, priv->gwca.index))
                rswitch_agent_clock_ctrl(priv->addr, priv->gwca.index, 1);

        iowrite32(mode, priv->addr + GWMC);

        ret = rswitch_reg_wait(priv->addr, GWMS, GWMS_OPS_MASK, mode);

        if (mode == GWMC_OPC_DISABLE)
                rswitch_agent_clock_ctrl(priv->addr, priv->gwca.index, 0);

        return ret;
}

static int rswitch_gwca_mcast_table_reset(struct rswitch_private *priv)
{
        iowrite32(GWMTIRM_MTIOG, priv->addr + GWMTIRM);

        return rswitch_reg_wait(priv->addr, GWMTIRM, GWMTIRM_MTR, GWMTIRM_MTR);
}

static int rswitch_gwca_axi_ram_reset(struct rswitch_private *priv)
{
        iowrite32(GWARIRM_ARIOG, priv->addr + GWARIRM);

        return rswitch_reg_wait(priv->addr, GWARIRM, GWARIRM_ARR, GWARIRM_ARR);
}

static bool rswitch_is_any_data_irq(struct rswitch_private *priv, u32 *dis, bool tx)
{
        u32 *mask = tx ? priv->gwca.tx_irq_bits : priv->gwca.rx_irq_bits;
        unsigned int i;

        for (i = 0; i < RSWITCH_NUM_IRQ_REGS; i++) {
                if (dis[i] & mask[i])
                        return true;
        }

        return false;
}

static void rswitch_get_data_irq_status(struct rswitch_private *priv, u32 *dis)
{
        unsigned int i;

        for (i = 0; i < RSWITCH_NUM_IRQ_REGS; i++) {
                dis[i] = ioread32(priv->addr + GWDIS(i));
                dis[i] &= ioread32(priv->addr + GWDIE(i));
        }
}

static void rswitch_enadis_data_irq(struct rswitch_private *priv,
                                    unsigned int index, bool enable)
{
        u32 offs = enable ? GWDIE(index / 32) : GWDID(index / 32);

        iowrite32(BIT(index % 32), priv->addr + offs);
}

static void rswitch_ack_data_irq(struct rswitch_private *priv,
                                 unsigned int index)
{
        u32 offs = GWDIS(index / 32);

        iowrite32(BIT(index % 32), priv->addr + offs);
}

static unsigned int rswitch_next_queue_index(struct rswitch_gwca_queue *gq,
                                             bool cur, unsigned int num)
{
        unsigned int index = cur ? gq->cur : gq->dirty;

        if (index + num >= gq->ring_size)
                index = (index + num) % gq->ring_size;
        else
                index += num;

        return index;
}

static unsigned int rswitch_get_num_cur_queues(struct rswitch_gwca_queue *gq)
{
        if (gq->cur >= gq->dirty)
                return gq->cur - gq->dirty;
        else
                return gq->ring_size - gq->dirty + gq->cur;
}

static bool rswitch_is_queue_rxed(struct rswitch_gwca_queue *gq)
{
        struct rswitch_ext_ts_desc *desc = &gq->rx_ring[gq->dirty];

        if ((desc->desc.die_dt & DT_MASK) != DT_FEMPTY)
                return true;

        return false;
}

static int rswitch_gwca_queue_alloc_rx_buf(struct rswitch_gwca_queue *gq,
                                           unsigned int start_index,
                                           unsigned int num)
{
        unsigned int i, index;

        for (i = 0; i < num; i++) {
                index = (i + start_index) % gq->ring_size;
                if (gq->rx_bufs[index])
                        continue;
                gq->rx_bufs[index] = netdev_alloc_frag(RSWITCH_BUF_SIZE);
                if (!gq->rx_bufs[index])
                        goto err;
        }

        return 0;

err:
        for (; i-- > 0; ) {
                index = (i + start_index) % gq->ring_size;
                skb_free_frag(gq->rx_bufs[index]);
                gq->rx_bufs[index] = NULL;
        }

        return -ENOMEM;
}

static void rswitch_gwca_queue_free(struct net_device *ndev,
                                    struct rswitch_gwca_queue *gq)
{
        unsigned int i;

        if (!gq->dir_tx) {
                dma_free_coherent(ndev->dev.parent,
                                  sizeof(struct rswitch_ext_ts_desc) *
                                  (gq->ring_size + 1), gq->rx_ring, gq->ring_dma);
                gq->rx_ring = NULL;

                for (i = 0; i < gq->ring_size; i++)
                        skb_free_frag(gq->rx_bufs[i]);
                kfree(gq->rx_bufs);
                gq->rx_bufs = NULL;
        } else {
                dma_free_coherent(ndev->dev.parent,
                                  sizeof(struct rswitch_ext_desc) *
                                  (gq->ring_size + 1), gq->tx_ring, gq->ring_dma);
                gq->tx_ring = NULL;
                kfree(gq->skbs);
                gq->skbs = NULL;
                kfree(gq->unmap_addrs);
                gq->unmap_addrs = NULL;
        }
}

static void rswitch_gwca_ts_queue_free(struct rswitch_private *priv)
{
        struct rswitch_gwca_queue *gq = &priv->gwca.ts_queue;

        dma_free_coherent(&priv->pdev->dev,
                          sizeof(struct rswitch_ts_desc) * (gq->ring_size + 1),
                          gq->ts_ring, gq->ring_dma);
        gq->ts_ring = NULL;
}

static int rswitch_gwca_queue_alloc(struct net_device *ndev,
                                    struct rswitch_private *priv,
                                    struct rswitch_gwca_queue *gq,
                                    bool dir_tx, unsigned int ring_size)
{
        unsigned int i, bit;

        gq->dir_tx = dir_tx;
        gq->ring_size = ring_size;
        gq->ndev = ndev;

        if (!dir_tx) {
                gq->rx_bufs = kzalloc_objs(*gq->rx_bufs, gq->ring_size);
                if (!gq->rx_bufs)
                        return -ENOMEM;
                if (rswitch_gwca_queue_alloc_rx_buf(gq, 0, gq->ring_size) < 0)
                        goto out;

                gq->rx_ring = dma_alloc_coherent(ndev->dev.parent,
                                                 sizeof(struct rswitch_ext_ts_desc) *
                                                 (gq->ring_size + 1), &gq->ring_dma, GFP_KERNEL);
        } else {
                gq->skbs = kzalloc_objs(*gq->skbs, gq->ring_size);
                if (!gq->skbs)
                        return -ENOMEM;
                gq->unmap_addrs = kzalloc_objs(*gq->unmap_addrs, gq->ring_size);
                if (!gq->unmap_addrs)
                        goto out;
                gq->tx_ring = dma_alloc_coherent(ndev->dev.parent,
                                                 sizeof(struct rswitch_ext_desc) *
                                                 (gq->ring_size + 1), &gq->ring_dma, GFP_KERNEL);
        }

        if (!gq->rx_ring && !gq->tx_ring)
                goto out;

        i = gq->index / 32;
        bit = BIT(gq->index % 32);
        if (dir_tx)
                priv->gwca.tx_irq_bits[i] |= bit;
        else
                priv->gwca.rx_irq_bits[i] |= bit;

        return 0;

out:
        rswitch_gwca_queue_free(ndev, gq);

        return -ENOMEM;
}

static void rswitch_desc_set_dptr(struct rswitch_desc *desc, dma_addr_t addr)
{
        desc->dptrl = cpu_to_le32(lower_32_bits(addr));
        desc->dptrh = upper_32_bits(addr) & 0xff;
}

static dma_addr_t rswitch_desc_get_dptr(const struct rswitch_desc *desc)
{
        return __le32_to_cpu(desc->dptrl) | (u64)(desc->dptrh) << 32;
}

static int rswitch_gwca_queue_format(struct net_device *ndev,
                                     struct rswitch_private *priv,
                                     struct rswitch_gwca_queue *gq)
{
        unsigned int ring_size = sizeof(struct rswitch_ext_desc) * gq->ring_size;
        struct rswitch_ext_desc *desc;
        struct rswitch_desc *linkfix;
        dma_addr_t dma_addr;
        unsigned int i;

        memset(gq->tx_ring, 0, ring_size);
        for (i = 0, desc = gq->tx_ring; i < gq->ring_size; i++, desc++) {
                if (!gq->dir_tx) {
                        dma_addr = dma_map_single(ndev->dev.parent,
                                                  gq->rx_bufs[i] + RSWITCH_HEADROOM,
                                                  RSWITCH_MAP_BUF_SIZE,
                                                  DMA_FROM_DEVICE);
                        if (dma_mapping_error(ndev->dev.parent, dma_addr))
                                goto err;

                        desc->desc.info_ds = cpu_to_le16(RSWITCH_DESC_BUF_SIZE);
                        rswitch_desc_set_dptr(&desc->desc, dma_addr);
                        desc->desc.die_dt = DT_FEMPTY | DIE;
                } else {
                        desc->desc.die_dt = DT_EEMPTY | DIE;
                }
        }
        rswitch_desc_set_dptr(&desc->desc, gq->ring_dma);
        desc->desc.die_dt = DT_LINKFIX;

        linkfix = &priv->gwca.linkfix_table[gq->index];
        linkfix->die_dt = DT_LINKFIX;
        rswitch_desc_set_dptr(linkfix, gq->ring_dma);

        iowrite32(GWDCC_BALR | (gq->dir_tx ? GWDCC_DCP(GWCA_IPV_NUM) | GWDCC_DQT : 0) | GWDCC_EDE,
                  priv->addr + GWDCC_OFFS(gq->index));

        return 0;

err:
        if (!gq->dir_tx) {
                for (desc = gq->tx_ring; i-- > 0; desc++) {
                        dma_addr = rswitch_desc_get_dptr(&desc->desc);
                        dma_unmap_single(ndev->dev.parent, dma_addr,
                                         RSWITCH_MAP_BUF_SIZE, DMA_FROM_DEVICE);
                }
        }

        return -ENOMEM;
}

static void rswitch_gwca_ts_queue_fill(struct rswitch_private *priv,
                                       unsigned int start_index,
                                       unsigned int num)
{
        struct rswitch_gwca_queue *gq = &priv->gwca.ts_queue;
        struct rswitch_ts_desc *desc;
        unsigned int i, index;

        for (i = 0; i < num; i++) {
                index = (i + start_index) % gq->ring_size;
                desc = &gq->ts_ring[index];
                desc->desc.die_dt = DT_FEMPTY_ND | DIE;
        }
}

static int rswitch_gwca_queue_ext_ts_fill(struct net_device *ndev,
                                          struct rswitch_gwca_queue *gq,
                                          unsigned int start_index,
                                          unsigned int num)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        struct rswitch_ext_ts_desc *desc;
        unsigned int i, index;
        dma_addr_t dma_addr;

        for (i = 0; i < num; i++) {
                index = (i + start_index) % gq->ring_size;
                desc = &gq->rx_ring[index];
                if (!gq->dir_tx) {
                        dma_addr = dma_map_single(ndev->dev.parent,
                                                  gq->rx_bufs[index] + RSWITCH_HEADROOM,
                                                  RSWITCH_MAP_BUF_SIZE,
                                                  DMA_FROM_DEVICE);
                        if (dma_mapping_error(ndev->dev.parent, dma_addr))
                                goto err;

                        desc->desc.info_ds = cpu_to_le16(RSWITCH_DESC_BUF_SIZE);
                        rswitch_desc_set_dptr(&desc->desc, dma_addr);
                        dma_wmb();
                        desc->desc.die_dt = DT_FEMPTY | DIE;
                        desc->info1 = cpu_to_le64(INFO1_SPN(rdev->etha->index));
                } else {
                        desc->desc.die_dt = DT_EEMPTY | DIE;
                }
        }

        return 0;

err:
        if (!gq->dir_tx) {
                for (; i-- > 0; ) {
                        index = (i + start_index) % gq->ring_size;
                        desc = &gq->rx_ring[index];
                        dma_addr = rswitch_desc_get_dptr(&desc->desc);
                        dma_unmap_single(ndev->dev.parent, dma_addr,
                                         RSWITCH_MAP_BUF_SIZE, DMA_FROM_DEVICE);
                }
        }

        return -ENOMEM;
}

static int rswitch_gwca_queue_ext_ts_format(struct net_device *ndev,
                                            struct rswitch_private *priv,
                                            struct rswitch_gwca_queue *gq)
{
        unsigned int ring_size = sizeof(struct rswitch_ext_ts_desc) * gq->ring_size;
        struct rswitch_ext_ts_desc *desc;
        struct rswitch_desc *linkfix;
        int err;

        memset(gq->rx_ring, 0, ring_size);
        err = rswitch_gwca_queue_ext_ts_fill(ndev, gq, 0, gq->ring_size);
        if (err < 0)
                return err;

        desc = &gq->rx_ring[gq->ring_size];     /* Last */
        rswitch_desc_set_dptr(&desc->desc, gq->ring_dma);
        desc->desc.die_dt = DT_LINKFIX;

        linkfix = &priv->gwca.linkfix_table[gq->index];
        linkfix->die_dt = DT_LINKFIX;
        rswitch_desc_set_dptr(linkfix, gq->ring_dma);

        iowrite32(GWDCC_BALR | (gq->dir_tx ? GWDCC_DCP(GWCA_IPV_NUM) | GWDCC_DQT : 0) |
                  GWDCC_ETS | GWDCC_EDE,
                  priv->addr + GWDCC_OFFS(gq->index));

        return 0;
}

static int rswitch_gwca_linkfix_alloc(struct rswitch_private *priv)
{
        unsigned int i, num_queues = priv->gwca.num_queues;
        struct rswitch_gwca *gwca = &priv->gwca;
        struct device *dev = &priv->pdev->dev;

        gwca->linkfix_table_size = sizeof(struct rswitch_desc) * num_queues;
        gwca->linkfix_table = dma_alloc_coherent(dev, gwca->linkfix_table_size,
                                                 &gwca->linkfix_table_dma, GFP_KERNEL);
        if (!gwca->linkfix_table)
                return -ENOMEM;
        for (i = 0; i < num_queues; i++)
                gwca->linkfix_table[i].die_dt = DT_EOS;

        return 0;
}

static void rswitch_gwca_linkfix_free(struct rswitch_private *priv)
{
        struct rswitch_gwca *gwca = &priv->gwca;

        if (gwca->linkfix_table)
                dma_free_coherent(&priv->pdev->dev, gwca->linkfix_table_size,
                                  gwca->linkfix_table, gwca->linkfix_table_dma);
        gwca->linkfix_table = NULL;
}

static int rswitch_gwca_ts_queue_alloc(struct rswitch_private *priv)
{
        struct rswitch_gwca_queue *gq = &priv->gwca.ts_queue;
        struct rswitch_ts_desc *desc;

        gq->ring_size = TS_RING_SIZE;
        gq->ts_ring = dma_alloc_coherent(&priv->pdev->dev,
                                         sizeof(struct rswitch_ts_desc) *
                                         (gq->ring_size + 1), &gq->ring_dma, GFP_KERNEL);

        if (!gq->ts_ring)
                return -ENOMEM;

        rswitch_gwca_ts_queue_fill(priv, 0, TS_RING_SIZE);
        desc = &gq->ts_ring[gq->ring_size];
        desc->desc.die_dt = DT_LINKFIX;
        rswitch_desc_set_dptr(&desc->desc, gq->ring_dma);

        return 0;
}

static struct rswitch_gwca_queue *rswitch_gwca_get(struct rswitch_private *priv)
{
        struct rswitch_gwca_queue *gq;
        unsigned int index;

        index = find_first_zero_bit(priv->gwca.used, priv->gwca.num_queues);
        if (index >= priv->gwca.num_queues)
                return NULL;
        set_bit(index, priv->gwca.used);
        gq = &priv->gwca.queues[index];
        memset(gq, 0, sizeof(*gq));
        gq->index = index;

        return gq;
}

static void rswitch_gwca_put(struct rswitch_private *priv,
                             struct rswitch_gwca_queue *gq)
{
        clear_bit(gq->index, priv->gwca.used);
}

static int rswitch_txdmac_alloc(struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        struct rswitch_private *priv = rdev->priv;
        int err;

        rdev->tx_queue = rswitch_gwca_get(priv);
        if (!rdev->tx_queue)
                return -EBUSY;

        err = rswitch_gwca_queue_alloc(ndev, priv, rdev->tx_queue, true, TX_RING_SIZE);
        if (err < 0) {
                rswitch_gwca_put(priv, rdev->tx_queue);
                return err;
        }

        return 0;
}

static void rswitch_txdmac_free(struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);

        rswitch_gwca_queue_free(ndev, rdev->tx_queue);
        rswitch_gwca_put(rdev->priv, rdev->tx_queue);
}

static int rswitch_txdmac_init(struct rswitch_private *priv, unsigned int index)
{
        struct rswitch_device *rdev = priv->rdev[index];

        return rswitch_gwca_queue_format(rdev->ndev, priv, rdev->tx_queue);
}

static int rswitch_rxdmac_alloc(struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        struct rswitch_private *priv = rdev->priv;
        int err;

        rdev->rx_queue = rswitch_gwca_get(priv);
        if (!rdev->rx_queue)
                return -EBUSY;

        err = rswitch_gwca_queue_alloc(ndev, priv, rdev->rx_queue, false, RX_RING_SIZE);
        if (err < 0) {
                rswitch_gwca_put(priv, rdev->rx_queue);
                return err;
        }

        return 0;
}

static void rswitch_rxdmac_free(struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);

        rswitch_gwca_queue_free(ndev, rdev->rx_queue);
        rswitch_gwca_put(rdev->priv, rdev->rx_queue);
}

static int rswitch_rxdmac_init(struct rswitch_private *priv, unsigned int index)
{
        struct rswitch_device *rdev = priv->rdev[index];
        struct net_device *ndev = rdev->ndev;

        return rswitch_gwca_queue_ext_ts_format(ndev, priv, rdev->rx_queue);
}

static int rswitch_gwca_hw_init(struct rswitch_private *priv)
{
        unsigned int i;
        int err;

        err = rswitch_gwca_change_mode(priv, GWMC_OPC_DISABLE);
        if (err < 0)
                return err;
        err = rswitch_gwca_change_mode(priv, GWMC_OPC_CONFIG);
        if (err < 0)
                return err;

        err = rswitch_gwca_mcast_table_reset(priv);
        if (err < 0)
                return err;
        err = rswitch_gwca_axi_ram_reset(priv);
        if (err < 0)
                return err;

        iowrite32(GWVCC_VEM_SC_TAG, priv->addr + GWVCC);
        iowrite32(0, priv->addr + GWTTFC);
        iowrite32(lower_32_bits(priv->gwca.linkfix_table_dma), priv->addr + GWDCBAC1);
        iowrite32(upper_32_bits(priv->gwca.linkfix_table_dma), priv->addr + GWDCBAC0);
        iowrite32(lower_32_bits(priv->gwca.ts_queue.ring_dma), priv->addr + GWTDCAC10);
        iowrite32(upper_32_bits(priv->gwca.ts_queue.ring_dma), priv->addr + GWTDCAC00);
        iowrite32(GWMDNC_TSDMN(1) | GWMDNC_TXDMN(0x1e) | GWMDNC_RXDMN(0x1f),
                  priv->addr + GWMDNC);
        iowrite32(GWCA_TS_IRQ_BIT, priv->addr + GWTSDCC0);

        iowrite32(GWTPC_PPPL(GWCA_IPV_NUM), priv->addr + GWTPC0);

        for (i = 0; i < RSWITCH_NUM_PORTS; i++) {
                err = rswitch_rxdmac_init(priv, i);
                if (err < 0)
                        return err;
                err = rswitch_txdmac_init(priv, i);
                if (err < 0)
                        return err;
        }

        err = rswitch_gwca_change_mode(priv, GWMC_OPC_DISABLE);
        if (err < 0)
                return err;
        return rswitch_gwca_change_mode(priv, GWMC_OPC_OPERATION);
}

static int rswitch_gwca_hw_deinit(struct rswitch_private *priv)
{
        int err;

        err = rswitch_gwca_change_mode(priv, GWMC_OPC_DISABLE);
        if (err < 0)
                return err;
        err = rswitch_gwca_change_mode(priv, GWMC_OPC_RESET);
        if (err < 0)
                return err;

        return rswitch_gwca_change_mode(priv, GWMC_OPC_DISABLE);
}

static int rswitch_gwca_halt(struct rswitch_private *priv)
{
        int err;

        priv->gwca_halt = true;
        err = rswitch_gwca_hw_deinit(priv);
        dev_err(&priv->pdev->dev, "halted (%d)\n", err);

        return err;
}

static struct sk_buff *rswitch_rx_handle_desc(struct net_device *ndev,
                                              struct rswitch_gwca_queue *gq,
                                              struct rswitch_ext_ts_desc *desc)
{
        dma_addr_t dma_addr = rswitch_desc_get_dptr(&desc->desc);
        u16 pkt_len = le16_to_cpu(desc->desc.info_ds) & RX_DS;
        u8 die_dt = desc->desc.die_dt & DT_MASK;
        struct sk_buff *skb = NULL;

        dma_unmap_single(ndev->dev.parent, dma_addr, RSWITCH_MAP_BUF_SIZE,
                         DMA_FROM_DEVICE);

        /* The RX descriptor order will be one of the following:
         * - FSINGLE
         * - FSTART -> FEND
         * - FSTART -> FMID -> FEND
         */

        /* Check whether the descriptor is unexpected order */
        switch (die_dt) {
        case DT_FSTART:
        case DT_FSINGLE:
                if (gq->skb_fstart) {
                        dev_kfree_skb_any(gq->skb_fstart);
                        gq->skb_fstart = NULL;
                        ndev->stats.rx_dropped++;
                }
                break;
        case DT_FMID:
        case DT_FEND:
                if (!gq->skb_fstart) {
                        ndev->stats.rx_dropped++;
                        return NULL;
                }
                break;
        default:
                break;
        }

        /* Handle the descriptor */
        switch (die_dt) {
        case DT_FSTART:
        case DT_FSINGLE:
                skb = build_skb(gq->rx_bufs[gq->cur], RSWITCH_BUF_SIZE);
                if (skb) {
                        skb_reserve(skb, RSWITCH_HEADROOM);
                        skb_put(skb, pkt_len);
                        gq->pkt_len = pkt_len;
                        if (die_dt == DT_FSTART) {
                                gq->skb_fstart = skb;
                                skb = NULL;
                        }
                }
                break;
        case DT_FMID:
        case DT_FEND:
                skb_add_rx_frag(gq->skb_fstart, skb_shinfo(gq->skb_fstart)->nr_frags,
                                virt_to_page(gq->rx_bufs[gq->cur]),
                                offset_in_page(gq->rx_bufs[gq->cur]) + RSWITCH_HEADROOM,
                                pkt_len, RSWITCH_BUF_SIZE);
                if (die_dt == DT_FEND) {
                        skb = gq->skb_fstart;
                        gq->skb_fstart = NULL;
                }
                gq->pkt_len += pkt_len;
                break;
        default:
                netdev_err(ndev, "%s: unexpected value (%x)\n", __func__, die_dt);
                break;
        }

        return skb;
}

static bool rswitch_rx(struct net_device *ndev, int *quota)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        struct rswitch_gwca_queue *gq = rdev->rx_queue;
        struct rswitch_ext_ts_desc *desc;
        int limit, boguscnt, ret;
        struct sk_buff *skb;
        unsigned int num;
        u32 get_ts;

        if (*quota <= 0)
                return true;

        boguscnt = min_t(int, gq->ring_size, *quota);
        limit = boguscnt;

        desc = &gq->rx_ring[gq->cur];
        while ((desc->desc.die_dt & DT_MASK) != DT_FEMPTY) {
                dma_rmb();
                skb = rswitch_rx_handle_desc(ndev, gq, desc);
                if (!skb)
                        goto out;

                get_ts = rdev->priv->tstamp_rx_ctrl != HWTSTAMP_FILTER_NONE;
                if (get_ts) {
                        struct skb_shared_hwtstamps *shhwtstamps;
                        struct timespec64 ts;

                        shhwtstamps = skb_hwtstamps(skb);
                        memset(shhwtstamps, 0, sizeof(*shhwtstamps));
                        ts.tv_sec = __le32_to_cpu(desc->ts_sec);
                        ts.tv_nsec = __le32_to_cpu(desc->ts_nsec & cpu_to_le32(0x3fffffff));
                        shhwtstamps->hwtstamp = timespec64_to_ktime(ts);
                }
                skb->protocol = eth_type_trans(skb, ndev);
                napi_gro_receive(&rdev->napi, skb);
                rdev->ndev->stats.rx_packets++;
                rdev->ndev->stats.rx_bytes += gq->pkt_len;

out:
                gq->rx_bufs[gq->cur] = NULL;
                gq->cur = rswitch_next_queue_index(gq, true, 1);
                desc = &gq->rx_ring[gq->cur];

                if (--boguscnt <= 0)
                        break;
        }

        num = rswitch_get_num_cur_queues(gq);
        ret = rswitch_gwca_queue_alloc_rx_buf(gq, gq->dirty, num);
        if (ret < 0)
                goto err;
        ret = rswitch_gwca_queue_ext_ts_fill(ndev, gq, gq->dirty, num);
        if (ret < 0)
                goto err;
        gq->dirty = rswitch_next_queue_index(gq, false, num);

        *quota -= limit - boguscnt;

        return boguscnt <= 0;

err:
        rswitch_gwca_halt(rdev->priv);

        return 0;
}

static void rswitch_tx_free(struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        struct rswitch_gwca_queue *gq = rdev->tx_queue;
        struct rswitch_ext_desc *desc;
        struct sk_buff *skb;

        desc = &gq->tx_ring[gq->dirty];
        while ((desc->desc.die_dt & DT_MASK) == DT_FEMPTY) {
                dma_rmb();

                skb = gq->skbs[gq->dirty];
                if (skb) {
                        rdev->ndev->stats.tx_packets++;
                        rdev->ndev->stats.tx_bytes += skb->len;
                        dma_unmap_single(ndev->dev.parent,
                                         gq->unmap_addrs[gq->dirty],
                                         skb->len, DMA_TO_DEVICE);
                        dev_kfree_skb_any(gq->skbs[gq->dirty]);
                        gq->skbs[gq->dirty] = NULL;
                }

                desc->desc.die_dt = DT_EEMPTY;
                gq->dirty = rswitch_next_queue_index(gq, false, 1);
                desc = &gq->tx_ring[gq->dirty];
        }
}

static int rswitch_poll(struct napi_struct *napi, int budget)
{
        struct net_device *ndev = napi->dev;
        struct rswitch_private *priv;
        struct rswitch_device *rdev;
        unsigned long flags;
        int quota = budget;

        rdev = netdev_priv(ndev);
        priv = rdev->priv;

retry:
        rswitch_tx_free(ndev);

        if (rswitch_rx(ndev, &quota))
                goto out;
        else if (rdev->priv->gwca_halt)
                goto err;
        else if (rswitch_is_queue_rxed(rdev->rx_queue))
                goto retry;

        netif_wake_subqueue(ndev, 0);

        if (napi_complete_done(napi, budget - quota)) {
                spin_lock_irqsave(&priv->lock, flags);
                if (test_bit(rdev->port, priv->opened_ports)) {
                        rswitch_enadis_data_irq(priv, rdev->tx_queue->index, true);
                        rswitch_enadis_data_irq(priv, rdev->rx_queue->index, true);
                }
                spin_unlock_irqrestore(&priv->lock, flags);
        }

out:
        return budget - quota;

err:
        napi_complete(napi);

        return 0;
}

static void rswitch_queue_interrupt(struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);

        if (napi_schedule_prep(&rdev->napi)) {
                spin_lock(&rdev->priv->lock);
                rswitch_enadis_data_irq(rdev->priv, rdev->tx_queue->index, false);
                rswitch_enadis_data_irq(rdev->priv, rdev->rx_queue->index, false);
                spin_unlock(&rdev->priv->lock);
                __napi_schedule(&rdev->napi);
        }
}

static irqreturn_t rswitch_data_irq(struct rswitch_private *priv, u32 *dis)
{
        struct rswitch_gwca_queue *gq;
        unsigned int i, index, bit;

        for (i = 0; i < priv->gwca.num_queues; i++) {
                gq = &priv->gwca.queues[i];
                index = gq->index / 32;
                bit = BIT(gq->index % 32);
                if (!(dis[index] & bit))
                        continue;

                rswitch_ack_data_irq(priv, gq->index);
                rswitch_queue_interrupt(gq->ndev);
        }

        return IRQ_HANDLED;
}

static irqreturn_t rswitch_gwca_irq(int irq, void *dev_id)
{
        struct rswitch_private *priv = dev_id;
        u32 dis[RSWITCH_NUM_IRQ_REGS];
        irqreturn_t ret = IRQ_NONE;

        rswitch_get_data_irq_status(priv, dis);

        if (rswitch_is_any_data_irq(priv, dis, true) ||
            rswitch_is_any_data_irq(priv, dis, false))
                ret = rswitch_data_irq(priv, dis);

        return ret;
}

static int rswitch_gwca_request_irqs(struct rswitch_private *priv)
{
        char *resource_name, *irq_name;
        int i, ret, irq;

        for (i = 0; i < GWCA_NUM_IRQS; i++) {
                resource_name = kasprintf(GFP_KERNEL, GWCA_IRQ_RESOURCE_NAME, i);
                if (!resource_name)
                        return -ENOMEM;

                irq = platform_get_irq_byname(priv->pdev, resource_name);
                kfree(resource_name);
                if (irq < 0)
                        return irq;

                irq_name = devm_kasprintf(&priv->pdev->dev, GFP_KERNEL,
                                          GWCA_IRQ_NAME, i);
                if (!irq_name)
                        return -ENOMEM;

                ret = devm_request_irq(&priv->pdev->dev, irq, rswitch_gwca_irq,
                                       0, irq_name, priv);
                if (ret < 0)
                        return ret;
        }

        return 0;
}

static void rswitch_ts(struct rswitch_private *priv)
{
        struct rswitch_gwca_queue *gq = &priv->gwca.ts_queue;
        struct skb_shared_hwtstamps shhwtstamps;
        struct rswitch_ts_desc *desc;
        struct rswitch_device *rdev;
        struct sk_buff *ts_skb;
        struct timespec64 ts;
        unsigned int num;
        u32 tag, port;

        desc = &gq->ts_ring[gq->cur];
        while ((desc->desc.die_dt & DT_MASK) != DT_FEMPTY_ND) {
                dma_rmb();

                port = TS_DESC_DPN(__le32_to_cpu(desc->desc.dptrl));
                if (unlikely(port >= RSWITCH_NUM_PORTS))
                        goto next;
                rdev = priv->rdev[port];

                tag = TS_DESC_TSUN(__le32_to_cpu(desc->desc.dptrl));
                if (unlikely(tag >= TS_TAGS_PER_PORT))
                        goto next;
                ts_skb = xchg(&rdev->ts_skb[tag], NULL);
                smp_mb(); /* order rdev->ts_skb[] read before bitmap update */
                clear_bit(tag, rdev->ts_skb_used);

                if (unlikely(!ts_skb))
                        goto next;

                memset(&shhwtstamps, 0, sizeof(shhwtstamps));
                ts.tv_sec = __le32_to_cpu(desc->ts_sec);
                ts.tv_nsec = __le32_to_cpu(desc->ts_nsec & cpu_to_le32(0x3fffffff));
                shhwtstamps.hwtstamp = timespec64_to_ktime(ts);
                skb_tstamp_tx(ts_skb, &shhwtstamps);
                dev_consume_skb_irq(ts_skb);

next:
                gq->cur = rswitch_next_queue_index(gq, true, 1);
                desc = &gq->ts_ring[gq->cur];
        }

        num = rswitch_get_num_cur_queues(gq);
        rswitch_gwca_ts_queue_fill(priv, gq->dirty, num);
        gq->dirty = rswitch_next_queue_index(gq, false, num);
}

static irqreturn_t rswitch_gwca_ts_irq(int irq, void *dev_id)
{
        struct rswitch_private *priv = dev_id;

        if (ioread32(priv->addr + GWTSDIS) & GWCA_TS_IRQ_BIT) {
                iowrite32(GWCA_TS_IRQ_BIT, priv->addr + GWTSDIS);
                rswitch_ts(priv);

                return IRQ_HANDLED;
        }

        return IRQ_NONE;
}

static int rswitch_gwca_ts_request_irqs(struct rswitch_private *priv)
{
        int irq;

        irq = platform_get_irq_byname(priv->pdev, GWCA_TS_IRQ_RESOURCE_NAME);
        if (irq < 0)
                return irq;

        return devm_request_irq(&priv->pdev->dev, irq, rswitch_gwca_ts_irq,
                                0, GWCA_TS_IRQ_NAME, priv);
}

/* Ethernet TSN Agent block (ETHA) and Ethernet MAC IP block (RMAC) */
static int rswitch_etha_change_mode(struct rswitch_etha *etha,
                                    enum rswitch_etha_mode mode)
{
        int ret;

        if (!rswitch_agent_clock_is_enabled(etha->coma_addr, etha->index))
                rswitch_agent_clock_ctrl(etha->coma_addr, etha->index, 1);

        iowrite32(mode, etha->addr + EAMC);

        ret = rswitch_reg_wait(etha->addr, EAMS, EAMS_OPS_MASK, mode);

        if (mode == EAMC_OPC_DISABLE)
                rswitch_agent_clock_ctrl(etha->coma_addr, etha->index, 0);

        return ret;
}

static void rswitch_etha_read_mac_address(struct rswitch_etha *etha)
{
        u32 mrmac0 = ioread32(etha->addr + MRMAC0);
        u32 mrmac1 = ioread32(etha->addr + MRMAC1);
        u8 *mac = &etha->mac_addr[0];

        mac[0] = (mrmac0 >>  8) & 0xFF;
        mac[1] = (mrmac0 >>  0) & 0xFF;
        mac[2] = (mrmac1 >> 24) & 0xFF;
        mac[3] = (mrmac1 >> 16) & 0xFF;
        mac[4] = (mrmac1 >>  8) & 0xFF;
        mac[5] = (mrmac1 >>  0) & 0xFF;
}

static void rswitch_etha_write_mac_address(struct rswitch_etha *etha, const u8 *mac)
{
        iowrite32((mac[0] << 8) | mac[1], etha->addr + MRMAC0);
        iowrite32((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
                  etha->addr + MRMAC1);
}

static int rswitch_etha_wait_link_verification(struct rswitch_etha *etha)
{
        iowrite32(MLVC_PLV, etha->addr + MLVC);

        return rswitch_reg_wait(etha->addr, MLVC, MLVC_PLV, 0);
}

static void rswitch_rmac_setting(struct rswitch_etha *etha, const u8 *mac)
{
        u32 pis, lsc;

        rswitch_etha_write_mac_address(etha, mac);

        switch (etha->phy_interface) {
        case PHY_INTERFACE_MODE_SGMII:
                pis = MPIC_PIS_GMII;
                break;
        case PHY_INTERFACE_MODE_USXGMII:
        case PHY_INTERFACE_MODE_5GBASER:
                pis = MPIC_PIS_XGMII;
                break;
        default:
                pis = FIELD_GET(MPIC_PIS, ioread32(etha->addr + MPIC));
                break;
        }

        switch (etha->speed) {
        case 100:
                lsc = MPIC_LSC_100M;
                break;
        case 1000:
                lsc = MPIC_LSC_1G;
                break;
        case 2500:
                lsc = MPIC_LSC_2_5G;
                break;
        default:
                lsc = FIELD_GET(MPIC_LSC, ioread32(etha->addr + MPIC));
                break;
        }

        rswitch_modify(etha->addr, MPIC, MPIC_PIS | MPIC_LSC,
                       FIELD_PREP(MPIC_PIS, pis) | FIELD_PREP(MPIC_LSC, lsc));
}

static void rswitch_etha_enable_mii(struct rswitch_etha *etha)
{
        rswitch_modify(etha->addr, MPIC, MPIC_PSMCS | MPIC_PSMHT,
                       FIELD_PREP(MPIC_PSMCS, etha->psmcs) |
                       FIELD_PREP(MPIC_PSMHT, 0x06));
}

static int rswitch_etha_hw_init(struct rswitch_etha *etha, const u8 *mac)
{
        int err;

        err = rswitch_etha_change_mode(etha, EAMC_OPC_DISABLE);
        if (err < 0)
                return err;
        err = rswitch_etha_change_mode(etha, EAMC_OPC_CONFIG);
        if (err < 0)
                return err;

        iowrite32(EAVCC_VEM_SC_TAG, etha->addr + EAVCC);
        rswitch_rmac_setting(etha, mac);
        rswitch_etha_enable_mii(etha);

        err = rswitch_etha_wait_link_verification(etha);
        if (err < 0)
                return err;

        err = rswitch_etha_change_mode(etha, EAMC_OPC_DISABLE);
        if (err < 0)
                return err;

        return rswitch_etha_change_mode(etha, EAMC_OPC_OPERATION);
}

static int rswitch_etha_mpsm_op(struct rswitch_etha *etha, bool read,
                                unsigned int mmf, unsigned int pda,
                                unsigned int pra, unsigned int pop,
                                unsigned int prd)
{
        u32 val;
        int ret;

        val = MPSM_PSME |
              FIELD_PREP(MPSM_MFF, mmf) |
              FIELD_PREP(MPSM_PDA, pda) |
              FIELD_PREP(MPSM_PRA, pra) |
              FIELD_PREP(MPSM_POP, pop) |
              FIELD_PREP(MPSM_PRD, prd);
        iowrite32(val, etha->addr + MPSM);

        ret = rswitch_reg_wait(etha->addr, MPSM, MPSM_PSME, 0);
        if (ret)
                return ret;

        if (read) {
                val = ioread32(etha->addr + MPSM);
                ret = FIELD_GET(MPSM_PRD, val);
        }

        return ret;
}

static int rswitch_etha_mii_read_c45(struct mii_bus *bus, int addr, int devad,
                                     int regad)
{
        struct rswitch_etha *etha = bus->priv;
        int ret;

        ret = rswitch_etha_mpsm_op(etha, false, MPSM_MMF_C45, addr, devad,
                                   MPSM_POP_ADDRESS, regad);
        if (ret)
                return ret;

        return rswitch_etha_mpsm_op(etha, true, MPSM_MMF_C45, addr, devad,
                                    MPSM_POP_READ_C45, 0);
}

static int rswitch_etha_mii_write_c45(struct mii_bus *bus, int addr, int devad,
                                      int regad, u16 val)
{
        struct rswitch_etha *etha = bus->priv;
        int ret;

        ret = rswitch_etha_mpsm_op(etha, false, MPSM_MMF_C45, addr, devad,
                                   MPSM_POP_ADDRESS, regad);
        if (ret)
                return ret;

        return rswitch_etha_mpsm_op(etha, false, MPSM_MMF_C45, addr, devad,
                                    MPSM_POP_WRITE, val);
}

static int rswitch_etha_mii_read_c22(struct mii_bus *bus, int phyad, int regad)
{
        struct rswitch_etha *etha = bus->priv;

        return rswitch_etha_mpsm_op(etha, true, MPSM_MMF_C22, phyad, regad,
                                    MPSM_POP_READ_C22, 0);
}

static int rswitch_etha_mii_write_c22(struct mii_bus *bus, int phyad,
                                      int regad, u16 val)
{
        struct rswitch_etha *etha = bus->priv;

        return rswitch_etha_mpsm_op(etha, false, MPSM_MMF_C22, phyad, regad,
                                    MPSM_POP_WRITE, val);
}

/* Call of_node_put(port) after done */
static struct device_node *rswitch_get_port_node(struct rswitch_device *rdev)
{
        struct device_node *ports, *port;
        int err = 0;
        u32 index;

        ports = of_get_child_by_name(rdev->ndev->dev.parent->of_node,
                                     "ethernet-ports");
        if (!ports)
                return NULL;

        for_each_available_child_of_node(ports, port) {
                err = of_property_read_u32(port, "reg", &index);
                if (err < 0) {
                        port = NULL;
                        goto out;
                }
                if (index == rdev->etha->index)
                        break;
        }

out:
        of_node_put(ports);

        return port;
}

static int rswitch_etha_get_params(struct rswitch_device *rdev)
{
        u32 max_speed;
        int err;

        if (!rdev->np_port)
                return 0;       /* ignored */

        err = of_get_phy_mode(rdev->np_port, &rdev->etha->phy_interface);
        if (err)
                return err;

        err = of_property_read_u32(rdev->np_port, "max-speed", &max_speed);
        if (!err) {
                rdev->etha->speed = max_speed;
                return 0;
        }

        /* if no "max-speed" property, let's use default speed */
        switch (rdev->etha->phy_interface) {
        case PHY_INTERFACE_MODE_MII:
                rdev->etha->speed = SPEED_100;
                break;
        case PHY_INTERFACE_MODE_SGMII:
                rdev->etha->speed = SPEED_1000;
                break;
        case PHY_INTERFACE_MODE_USXGMII:
                rdev->etha->speed = SPEED_2500;
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int rswitch_mii_register(struct rswitch_device *rdev)
{
        struct device_node *mdio_np;
        struct mii_bus *mii_bus;
        int err;

        mii_bus = mdiobus_alloc();
        if (!mii_bus)
                return -ENOMEM;

        mii_bus->name = "rswitch_mii";
        sprintf(mii_bus->id, "etha%d", rdev->etha->index);
        mii_bus->priv = rdev->etha;
        mii_bus->read_c45 = rswitch_etha_mii_read_c45;
        mii_bus->write_c45 = rswitch_etha_mii_write_c45;
        mii_bus->read = rswitch_etha_mii_read_c22;
        mii_bus->write = rswitch_etha_mii_write_c22;
        mii_bus->parent = &rdev->priv->pdev->dev;

        mdio_np = of_get_child_by_name(rdev->np_port, "mdio");
        err = of_mdiobus_register(mii_bus, mdio_np);
        if (err < 0) {
                mdiobus_free(mii_bus);
                goto out;
        }

        rdev->etha->mii = mii_bus;

out:
        of_node_put(mdio_np);

        return err;
}

static void rswitch_mii_unregister(struct rswitch_device *rdev)
{
        if (rdev->etha->mii) {
                mdiobus_unregister(rdev->etha->mii);
                mdiobus_free(rdev->etha->mii);
                rdev->etha->mii = NULL;
        }
}

static void rswitch_adjust_link(struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        struct phy_device *phydev = ndev->phydev;

        if (phydev->link != rdev->etha->link) {
                phy_print_status(phydev);
                if (phydev->link)
                        phy_power_on(rdev->serdes);
                else if (rdev->serdes->power_count)
                        phy_power_off(rdev->serdes);

                rdev->etha->link = phydev->link;

                if (!rdev->priv->etha_no_runtime_change &&
                    phydev->speed != rdev->etha->speed) {
                        rdev->etha->speed = phydev->speed;

                        rswitch_etha_hw_init(rdev->etha, rdev->ndev->dev_addr);
                        phy_set_speed(rdev->serdes, rdev->etha->speed);
                }
        }
}

static void rswitch_phy_remove_link_mode(struct rswitch_device *rdev,
                                         struct phy_device *phydev)
{
        if (!rdev->priv->etha_no_runtime_change)
                return;

        switch (rdev->etha->speed) {
        case SPEED_2500:
                phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Full_BIT);
                phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Full_BIT);
                break;
        case SPEED_1000:
                phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_2500baseX_Full_BIT);
                phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Full_BIT);
                break;
        case SPEED_100:
                phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_2500baseX_Full_BIT);
                phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Full_BIT);
                break;
        default:
                break;
        }

        phy_set_max_speed(phydev, rdev->etha->speed);
}

static int rswitch_phy_device_init(struct rswitch_device *rdev)
{
        struct phy_device *phydev;
        struct device_node *phy;
        int err = -ENOENT;

        if (!rdev->np_port)
                return -ENODEV;

        phy = of_parse_phandle(rdev->np_port, "phy-handle", 0);
        if (!phy)
                return -ENODEV;

        /* Set phydev->host_interfaces before calling of_phy_connect() to
         * configure the PHY with the information of host_interfaces.
         */
        phydev = of_phy_find_device(phy);
        if (!phydev)
                goto out;
        __set_bit(rdev->etha->phy_interface, phydev->host_interfaces);
        phydev->mac_managed_pm = true;

        phydev = of_phy_connect(rdev->ndev, phy, rswitch_adjust_link, 0,
                                rdev->etha->phy_interface);
        if (!phydev)
                goto out;

        phy_set_max_speed(phydev, SPEED_2500);
        phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT);
        phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT);
        phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT);
        phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
        rswitch_phy_remove_link_mode(rdev, phydev);

        phy_attached_info(phydev);

        err = 0;
out:
        of_node_put(phy);

        return err;
}

static void rswitch_phy_device_deinit(struct rswitch_device *rdev)
{
        if (rdev->ndev->phydev)
                phy_disconnect(rdev->ndev->phydev);
}

static int rswitch_serdes_set_params(struct rswitch_device *rdev)
{
        int err;

        err = phy_set_mode_ext(rdev->serdes, PHY_MODE_ETHERNET,
                               rdev->etha->phy_interface);
        if (err < 0)
                return err;

        return phy_set_speed(rdev->serdes, rdev->etha->speed);
}

static int rswitch_ether_port_init_one(struct rswitch_device *rdev)
{
        int err;

        if (!rdev->etha->operated) {
                err = rswitch_etha_hw_init(rdev->etha, rdev->ndev->dev_addr);
                if (err < 0)
                        return err;
                if (rdev->priv->etha_no_runtime_change)
                        rdev->etha->operated = true;
        }

        err = rswitch_mii_register(rdev);
        if (err < 0)
                return err;

        err = rswitch_phy_device_init(rdev);
        if (err < 0)
                goto err_phy_device_init;

        rdev->serdes = devm_of_phy_get(&rdev->priv->pdev->dev, rdev->np_port, NULL);
        if (IS_ERR(rdev->serdes)) {
                err = PTR_ERR(rdev->serdes);
                goto err_serdes_phy_get;
        }

        err = rswitch_serdes_set_params(rdev);
        if (err < 0)
                goto err_serdes_set_params;

        return 0;

err_serdes_set_params:
err_serdes_phy_get:
        rswitch_phy_device_deinit(rdev);

err_phy_device_init:
        rswitch_mii_unregister(rdev);

        return err;
}

static void rswitch_ether_port_deinit_one(struct rswitch_device *rdev)
{
        rswitch_phy_device_deinit(rdev);
        rswitch_mii_unregister(rdev);
}

static int rswitch_ether_port_init_all(struct rswitch_private *priv)
{
        unsigned int i;
        int err;

        rswitch_for_each_enabled_port(priv, i) {
                err = rswitch_ether_port_init_one(priv->rdev[i]);
                if (err)
                        goto err_init_one;
        }

        rswitch_for_each_enabled_port(priv, i) {
                err = phy_init(priv->rdev[i]->serdes);
                if (err)
                        goto err_serdes;
        }

        return 0;

err_serdes:
        rswitch_for_each_enabled_port_continue_reverse(priv, i)
                phy_exit(priv->rdev[i]->serdes);
        i = RSWITCH_NUM_PORTS;

err_init_one:
        rswitch_for_each_enabled_port_continue_reverse(priv, i)
                rswitch_ether_port_deinit_one(priv->rdev[i]);

        return err;
}

static void rswitch_ether_port_deinit_all(struct rswitch_private *priv)
{
        unsigned int i;

        rswitch_for_each_enabled_port(priv, i) {
                phy_exit(priv->rdev[i]->serdes);
                rswitch_ether_port_deinit_one(priv->rdev[i]);
        }
}

static int rswitch_open(struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        unsigned long flags;

        if (bitmap_empty(rdev->priv->opened_ports, RSWITCH_NUM_PORTS))
                iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDIE);

        napi_enable(&rdev->napi);

        spin_lock_irqsave(&rdev->priv->lock, flags);
        bitmap_set(rdev->priv->opened_ports, rdev->port, 1);
        rswitch_enadis_data_irq(rdev->priv, rdev->tx_queue->index, true);
        rswitch_enadis_data_irq(rdev->priv, rdev->rx_queue->index, true);
        spin_unlock_irqrestore(&rdev->priv->lock, flags);

        phy_start(ndev->phydev);

        netif_start_queue(ndev);

        if (rdev->brdev)
                rswitch_update_l2_offload(rdev->priv);

        return 0;
}

static int rswitch_stop(struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        struct sk_buff *ts_skb;
        unsigned long flags;
        unsigned int tag;

        netif_tx_stop_all_queues(ndev);

        phy_stop(ndev->phydev);

        spin_lock_irqsave(&rdev->priv->lock, flags);
        rswitch_enadis_data_irq(rdev->priv, rdev->tx_queue->index, false);
        rswitch_enadis_data_irq(rdev->priv, rdev->rx_queue->index, false);
        bitmap_clear(rdev->priv->opened_ports, rdev->port, 1);
        spin_unlock_irqrestore(&rdev->priv->lock, flags);

        napi_disable(&rdev->napi);

        if (rdev->brdev)
                rswitch_update_l2_offload(rdev->priv);

        if (bitmap_empty(rdev->priv->opened_ports, RSWITCH_NUM_PORTS))
                iowrite32(GWCA_TS_IRQ_BIT, rdev->priv->addr + GWTSDID);

        for_each_set_bit(tag, rdev->ts_skb_used, TS_TAGS_PER_PORT) {
                ts_skb = xchg(&rdev->ts_skb[tag], NULL);
                clear_bit(tag, rdev->ts_skb_used);
                if (ts_skb)
                        dev_kfree_skb(ts_skb);
        }

        return 0;
}

static bool rswitch_ext_desc_set_info1(struct rswitch_device *rdev,
                                       struct sk_buff *skb,
                                       struct rswitch_ext_desc *desc)
{
        desc->info1 = cpu_to_le64(INFO1_DV(BIT(rdev->etha->index)) |
                                  INFO1_IPV(GWCA_IPV_NUM) | INFO1_FMT);
        if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
                unsigned int tag;

                tag = find_first_zero_bit(rdev->ts_skb_used, TS_TAGS_PER_PORT);
                if (tag == TS_TAGS_PER_PORT)
                        return false;
                smp_mb(); /* order bitmap read before rdev->ts_skb[] write */
                rdev->ts_skb[tag] = skb_get(skb);
                set_bit(tag, rdev->ts_skb_used);

                skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
                desc->info1 |= cpu_to_le64(INFO1_TSUN(tag) | INFO1_TXC);

                skb_tx_timestamp(skb);
        }

        return true;
}

static bool rswitch_ext_desc_set(struct rswitch_device *rdev,
                                 struct sk_buff *skb,
                                 struct rswitch_ext_desc *desc,
                                 dma_addr_t dma_addr, u16 len, u8 die_dt)
{
        rswitch_desc_set_dptr(&desc->desc, dma_addr);
        desc->desc.info_ds = cpu_to_le16(len);
        if (!rswitch_ext_desc_set_info1(rdev, skb, desc))
                return false;

        dma_wmb();

        desc->desc.die_dt = die_dt;

        return true;
}

static u8 rswitch_ext_desc_get_die_dt(unsigned int nr_desc, unsigned int index)
{
        if (nr_desc == 1)
                return DT_FSINGLE | DIE;
        if (index == 0)
                return DT_FSTART;
        if (nr_desc - 1 == index)
                return DT_FEND | DIE;
        return DT_FMID;
}

static u16 rswitch_ext_desc_get_len(u8 die_dt, unsigned int orig_len)
{
        switch (die_dt & DT_MASK) {
        case DT_FSINGLE:
        case DT_FEND:
                return (orig_len % RSWITCH_DESC_BUF_SIZE) ?: RSWITCH_DESC_BUF_SIZE;
        case DT_FSTART:
        case DT_FMID:
                return RSWITCH_DESC_BUF_SIZE;
        default:
                return 0;
        }
}

static netdev_tx_t rswitch_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        struct rswitch_gwca_queue *gq = rdev->tx_queue;
        dma_addr_t dma_addr, dma_addr_orig;
        netdev_tx_t ret = NETDEV_TX_OK;
        struct rswitch_ext_desc *desc;
        unsigned int i, nr_desc;
        u8 die_dt;
        u16 len;

        nr_desc = (skb->len - 1) / RSWITCH_DESC_BUF_SIZE + 1;
        if (rswitch_get_num_cur_queues(gq) >= gq->ring_size - nr_desc) {
                netif_stop_subqueue(ndev, 0);
                return NETDEV_TX_BUSY;
        }

        if (skb_put_padto(skb, ETH_ZLEN))
                return ret;

        dma_addr_orig = dma_map_single(ndev->dev.parent, skb->data, skb->len, DMA_TO_DEVICE);
        if (dma_mapping_error(ndev->dev.parent, dma_addr_orig))
                goto err_kfree;

        /* Stored the skb at the last descriptor to avoid skb free before hardware completes send */
        gq->skbs[(gq->cur + nr_desc - 1) % gq->ring_size] = skb;
        gq->unmap_addrs[(gq->cur + nr_desc - 1) % gq->ring_size] = dma_addr_orig;

        dma_wmb();

        /* DT_FSTART should be set at last. So, this is reverse order. */
        for (i = nr_desc; i-- > 0; ) {
                desc = &gq->tx_ring[rswitch_next_queue_index(gq, true, i)];
                die_dt = rswitch_ext_desc_get_die_dt(nr_desc, i);
                dma_addr = dma_addr_orig + i * RSWITCH_DESC_BUF_SIZE;
                len = rswitch_ext_desc_get_len(die_dt, skb->len);
                if (!rswitch_ext_desc_set(rdev, skb, desc, dma_addr, len, die_dt))
                        goto err_unmap;
        }

        gq->cur = rswitch_next_queue_index(gq, true, nr_desc);
        rswitch_modify(rdev->addr, GWTRC(gq->index), 0, BIT(gq->index % 32));

        return ret;

err_unmap:
        gq->skbs[(gq->cur + nr_desc - 1) % gq->ring_size] = NULL;
        dma_unmap_single(ndev->dev.parent, dma_addr_orig, skb->len, DMA_TO_DEVICE);

err_kfree:
        dev_kfree_skb_any(skb);

        return ret;
}

static struct net_device_stats *rswitch_get_stats(struct net_device *ndev)
{
        return &ndev->stats;
}

static int rswitch_hwstamp_get(struct net_device *ndev,
                               struct kernel_hwtstamp_config *config)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        struct rswitch_private *priv = rdev->priv;

        config->flags = 0;
        config->tx_type = priv->tstamp_tx_ctrl;
        config->rx_filter = priv->tstamp_rx_ctrl;

        return 0;
}

static int rswitch_hwstamp_set(struct net_device *ndev,
                               struct kernel_hwtstamp_config *config,
                               struct netlink_ext_ack *extack)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        enum hwtstamp_rx_filters tstamp_rx_ctrl;
        enum hwtstamp_tx_types tstamp_tx_ctrl;

        if (config->flags)
                return -EINVAL;

        switch (config->tx_type) {
        case HWTSTAMP_TX_OFF:
        case HWTSTAMP_TX_ON:
                tstamp_tx_ctrl = config->tx_type;
                break;
        default:
                return -ERANGE;
        }

        switch (config->rx_filter) {
        case HWTSTAMP_FILTER_NONE:
        case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
                tstamp_rx_ctrl = config->rx_filter;
                break;
        default:
                config->rx_filter = HWTSTAMP_FILTER_ALL;
                tstamp_rx_ctrl = HWTSTAMP_FILTER_ALL;
                break;
        }

        rdev->priv->tstamp_tx_ctrl = tstamp_tx_ctrl;
        rdev->priv->tstamp_rx_ctrl = tstamp_rx_ctrl;

        return 0;
}

static int rswitch_get_port_parent_id(struct net_device *ndev,
                                      struct netdev_phys_item_id *ppid)
{
        struct rswitch_device *rdev = netdev_priv(ndev);
        const char *name;

        name = dev_name(&rdev->priv->pdev->dev);
        ppid->id_len = min_t(size_t, strlen(name), sizeof(ppid->id));
        memcpy(ppid->id, name, ppid->id_len);

        return 0;
}

static int rswitch_get_phys_port_name(struct net_device *ndev,
                                      char *name, size_t len)
{
        struct rswitch_device *rdev = netdev_priv(ndev);

        snprintf(name, len, "tsn%d", rdev->port);

        return 0;
}

static const struct net_device_ops rswitch_netdev_ops = {
        .ndo_open = rswitch_open,
        .ndo_stop = rswitch_stop,
        .ndo_start_xmit = rswitch_start_xmit,
        .ndo_get_stats = rswitch_get_stats,
        .ndo_eth_ioctl = phy_do_ioctl_running,
        .ndo_get_port_parent_id = rswitch_get_port_parent_id,
        .ndo_get_phys_port_name = rswitch_get_phys_port_name,
        .ndo_validate_addr = eth_validate_addr,
        .ndo_set_mac_address = eth_mac_addr,
        .ndo_hwtstamp_get = rswitch_hwstamp_get,
        .ndo_hwtstamp_set = rswitch_hwstamp_set,
};

bool is_rdev(const struct net_device *ndev)
{
        return (ndev->netdev_ops == &rswitch_netdev_ops);
}

static int rswitch_get_ts_info(struct net_device *ndev, struct kernel_ethtool_ts_info *info)
{
        struct rswitch_device *rdev = netdev_priv(ndev);

        info->phc_index = rcar_gen4_ptp_clock_index(rdev->priv->ptp_priv);
        info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
                                SOF_TIMESTAMPING_TX_HARDWARE |
                                SOF_TIMESTAMPING_RX_HARDWARE |
                                SOF_TIMESTAMPING_RAW_HARDWARE;
        info->tx_types = BIT(HWTSTAMP_TX_OFF) | BIT(HWTSTAMP_TX_ON);
        info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) | BIT(HWTSTAMP_FILTER_ALL);

        return 0;
}

static const struct ethtool_ops rswitch_ethtool_ops = {
        .get_ts_info = rswitch_get_ts_info,
        .get_link_ksettings = phy_ethtool_get_link_ksettings,
        .set_link_ksettings = phy_ethtool_set_link_ksettings,
};

static const struct of_device_id renesas_eth_sw_of_table[] = {
        { .compatible = "renesas,r8a779f0-ether-switch", },
        { }
};
MODULE_DEVICE_TABLE(of, renesas_eth_sw_of_table);

static void rswitch_etha_init(struct rswitch_private *priv, unsigned int index)
{
        struct rswitch_etha *etha = &priv->etha[index];

        memset(etha, 0, sizeof(*etha));
        etha->index = index;
        etha->addr = priv->addr + RSWITCH_ETHA_OFFSET + index * RSWITCH_ETHA_SIZE;
        etha->coma_addr = priv->addr;

        /* MPIC.PSMCS = (clk [MHz] / (MDC frequency [MHz] * 2) - 1.
         * Calculating PSMCS value as MDC frequency = 2.5MHz. So, multiply
         * both the numerator and the denominator by 10.
         */
        etha->psmcs = clk_get_rate(priv->clk) / 100000 / (25 * 2) - 1;
}

static int rswitch_device_alloc(struct rswitch_private *priv, unsigned int index)
{
        struct platform_device *pdev = priv->pdev;
        struct rswitch_device *rdev;
        struct net_device *ndev;
        int err;

        if (index >= RSWITCH_NUM_PORTS)
                return -EINVAL;

        ndev = alloc_etherdev_mqs(sizeof(struct rswitch_device), 1, 1);
        if (!ndev)
                return -ENOMEM;

        SET_NETDEV_DEV(ndev, &pdev->dev);
        ether_setup(ndev);

        rdev = netdev_priv(ndev);
        rdev->ndev = ndev;
        rdev->priv = priv;
        priv->rdev[index] = rdev;
        rdev->port = index;
        rdev->etha = &priv->etha[index];
        rdev->addr = priv->addr;

        ndev->base_addr = (unsigned long)rdev->addr;
        snprintf(ndev->name, IFNAMSIZ, "tsn%d", index);
        ndev->netdev_ops = &rswitch_netdev_ops;
        ndev->ethtool_ops = &rswitch_ethtool_ops;
        ndev->max_mtu = RSWITCH_MAX_MTU;
        ndev->min_mtu = ETH_MIN_MTU;

        netif_napi_add(ndev, &rdev->napi, rswitch_poll);

        rdev->np_port = rswitch_get_port_node(rdev);
        rdev->disabled = !rdev->np_port;
        err = of_get_ethdev_address(rdev->np_port, ndev);
        if (err) {
                if (is_valid_ether_addr(rdev->etha->mac_addr))
                        eth_hw_addr_set(ndev, rdev->etha->mac_addr);
                else
                        eth_hw_addr_random(ndev);
        }

        err = rswitch_etha_get_params(rdev);
        if (err < 0)
                goto out_get_params;

        err = rswitch_rxdmac_alloc(ndev);
        if (err < 0)
                goto out_rxdmac;

        err = rswitch_txdmac_alloc(ndev);
        if (err < 0)
                goto out_txdmac;

        list_add_tail(&rdev->list, &priv->port_list);

        return 0;

out_txdmac:
        rswitch_rxdmac_free(ndev);

out_rxdmac:
out_get_params:
        of_node_put(rdev->np_port);
        netif_napi_del(&rdev->napi);
        free_netdev(ndev);

        return err;
}

static void rswitch_device_free(struct rswitch_private *priv, unsigned int index)
{
        struct rswitch_device *rdev = priv->rdev[index];
        struct net_device *ndev = rdev->ndev;

        list_del(&rdev->list);
        rswitch_txdmac_free(ndev);
        rswitch_rxdmac_free(ndev);
        of_node_put(rdev->np_port);
        netif_napi_del(&rdev->napi);
        free_netdev(ndev);
}

static int rswitch_init(struct rswitch_private *priv)
{
        unsigned int i;
        int err;

        for (i = 0; i < RSWITCH_NUM_PORTS; i++)
                rswitch_etha_init(priv, i);

        rswitch_clock_enable(priv);
        for (i = 0; i < RSWITCH_NUM_PORTS; i++)
                rswitch_etha_read_mac_address(&priv->etha[i]);

        rswitch_reset(priv);

        rswitch_clock_enable(priv);
        rswitch_top_init(priv);
        err = rswitch_bpool_config(priv);
        if (err < 0)
                return err;

        rswitch_coma_init(priv);

        err = rswitch_gwca_linkfix_alloc(priv);
        if (err < 0)
                return -ENOMEM;

        err = rswitch_gwca_ts_queue_alloc(priv);
        if (err < 0)
                goto err_ts_queue_alloc;

        for (i = 0; i < RSWITCH_NUM_PORTS; i++) {
                err = rswitch_device_alloc(priv, i);
                if (err < 0) {
                        for (; i-- > 0; )
                                rswitch_device_free(priv, i);
                        goto err_device_alloc;
                }
        }

        err = rswitch_fwd_init(priv);
        if (err < 0)
                goto err_fwd_init;

        err = rcar_gen4_ptp_register(priv->ptp_priv, clk_get_rate(priv->clk));
        if (err < 0)
                goto err_ptp_register;

        err = rswitch_gwca_request_irqs(priv);
        if (err < 0)
                goto err_gwca_request_irq;

        err = rswitch_gwca_ts_request_irqs(priv);
        if (err < 0)
                goto err_gwca_ts_request_irq;

        err = rswitch_gwca_hw_init(priv);
        if (err < 0)
                goto err_gwca_hw_init;

        err = rswitch_ether_port_init_all(priv);
        if (err)
                goto err_ether_port_init_all;

        rswitch_for_each_enabled_port(priv, i) {
                err = register_netdev(priv->rdev[i]->ndev);
                if (err) {
                        rswitch_for_each_enabled_port_continue_reverse(priv, i)
                                unregister_netdev(priv->rdev[i]->ndev);
                        goto err_register_netdev;
                }
        }

        rswitch_for_each_enabled_port(priv, i)
                netdev_info(priv->rdev[i]->ndev, "MAC address %pM\n",
                            priv->rdev[i]->ndev->dev_addr);

        return 0;

err_register_netdev:
        rswitch_ether_port_deinit_all(priv);

err_ether_port_init_all:
        rswitch_gwca_hw_deinit(priv);

err_gwca_hw_init:
err_gwca_ts_request_irq:
err_gwca_request_irq:
        rcar_gen4_ptp_unregister(priv->ptp_priv);

err_fwd_init:
err_ptp_register:
        for (i = 0; i < RSWITCH_NUM_PORTS; i++)
                rswitch_device_free(priv, i);

err_device_alloc:
        rswitch_gwca_ts_queue_free(priv);

err_ts_queue_alloc:
        rswitch_gwca_linkfix_free(priv);

        return err;
}

static const struct soc_device_attribute rswitch_soc_no_speed_change[]  = {
        { .soc_id = "r8a779f0", .revision = "ES1.0" },
        { /* Sentinel */ }
};

static int renesas_eth_sw_probe(struct platform_device *pdev)
{
        const struct soc_device_attribute *attr;
        struct rswitch_private *priv;
        struct resource *res;
        int ret;

        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "secure_base");
        if (!res) {
                dev_err(&pdev->dev, "invalid resource\n");
                return -EINVAL;
        }

        priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;

        spin_lock_init(&priv->lock);

        priv->clk = devm_clk_get(&pdev->dev, NULL);
        if (IS_ERR(priv->clk))
                return PTR_ERR(priv->clk);

        attr = soc_device_match(rswitch_soc_no_speed_change);
        if (attr)
                priv->etha_no_runtime_change = true;

        platform_set_drvdata(pdev, priv);
        priv->pdev = pdev;
        priv->addr = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(priv->addr))
                return PTR_ERR(priv->addr);

        priv->ptp_priv =
                rcar_gen4_ptp_alloc(pdev, priv->addr + RSWITCH_GPTP_OFFSET_S4);
        if (!priv->ptp_priv)
                return -ENOMEM;

        ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40));
        if (ret < 0) {
                ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
                if (ret < 0)
                        return ret;
        }

        priv->gwca.index = AGENT_INDEX_GWCA;
        priv->gwca.num_queues = min(RSWITCH_NUM_PORTS * NUM_QUEUES_PER_NDEV,
                                    RSWITCH_MAX_NUM_QUEUES);
        priv->gwca.queues = devm_kcalloc(&pdev->dev, priv->gwca.num_queues,
                                         sizeof(*priv->gwca.queues), GFP_KERNEL);
        if (!priv->gwca.queues)
                return -ENOMEM;

        INIT_LIST_HEAD(&priv->port_list);

        pm_runtime_enable(&pdev->dev);
        pm_runtime_get_sync(&pdev->dev);

        ret = rswitch_init(priv);
        if (ret < 0) {
                pm_runtime_put(&pdev->dev);
                pm_runtime_disable(&pdev->dev);
                return ret;
        }

        if (list_empty(&priv->port_list))
                dev_warn(&pdev->dev, "could not initialize any ports\n");

        ret = rswitch_register_notifiers();
        if (ret) {
                dev_err(&pdev->dev, "could not register notifiers\n");
                return ret;
        }

        device_set_wakeup_capable(&pdev->dev, 1);

        return ret;
}

static void rswitch_deinit(struct rswitch_private *priv)
{
        unsigned int i;

        rswitch_gwca_hw_deinit(priv);
        rcar_gen4_ptp_unregister(priv->ptp_priv);

        rswitch_for_each_enabled_port(priv, i) {
                struct rswitch_device *rdev = priv->rdev[i];

                unregister_netdev(rdev->ndev);
                rswitch_ether_port_deinit_one(rdev);
                phy_exit(priv->rdev[i]->serdes);
        }

        for (i = 0; i < RSWITCH_NUM_PORTS; i++)
                rswitch_device_free(priv, i);

        rswitch_gwca_ts_queue_free(priv);
        rswitch_gwca_linkfix_free(priv);

        rswitch_clock_disable(priv);
}

static void renesas_eth_sw_remove(struct platform_device *pdev)
{
        struct rswitch_private *priv = platform_get_drvdata(pdev);

        rswitch_unregister_notifiers();
        rswitch_deinit(priv);

        pm_runtime_put(&pdev->dev);
        pm_runtime_disable(&pdev->dev);

        platform_set_drvdata(pdev, NULL);
}

static int renesas_eth_sw_suspend(struct device *dev)
{
        struct rswitch_private *priv = dev_get_drvdata(dev);
        struct net_device *ndev;
        unsigned int i;

        rswitch_for_each_enabled_port(priv, i) {
                ndev = priv->rdev[i]->ndev;
                if (netif_running(ndev)) {
                        netif_device_detach(ndev);
                        rswitch_stop(ndev);
                }
                if (priv->rdev[i]->serdes->init_count)
                        phy_exit(priv->rdev[i]->serdes);
        }

        return 0;
}

static int renesas_eth_sw_resume(struct device *dev)
{
        struct rswitch_private *priv = dev_get_drvdata(dev);
        struct net_device *ndev;
        unsigned int i;

        rswitch_for_each_enabled_port(priv, i) {
                phy_init(priv->rdev[i]->serdes);
                ndev = priv->rdev[i]->ndev;
                if (netif_running(ndev)) {
                        rswitch_open(ndev);
                        netif_device_attach(ndev);
                }
        }

        return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(renesas_eth_sw_pm_ops, renesas_eth_sw_suspend,
                                renesas_eth_sw_resume);

static struct platform_driver renesas_eth_sw_driver_platform = {
        .probe = renesas_eth_sw_probe,
        .remove = renesas_eth_sw_remove,
        .driver = {
                .name = "renesas_eth_sw",
                .pm = pm_sleep_ptr(&renesas_eth_sw_pm_ops),
                .of_match_table = renesas_eth_sw_of_table,
        }
};
module_platform_driver(renesas_eth_sw_driver_platform);
MODULE_AUTHOR("Yoshihiro Shimoda");
MODULE_DESCRIPTION("Renesas Ethernet Switch device driver");
MODULE_LICENSE("GPL");