// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * drivers/net/ethernet/nxp/lpc_eth.c
 *
 * Author: Kevin Wells <kevin.wells@nxp.com>
 *
 * Copyright (C) 2010 NXP Semiconductors
 * Copyright (C) 2012 Roland Stigge <stigge@antcom.de>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/clk.h>
#include <linux/crc32.h>
#include <linux/etherdevice.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/soc/nxp/lpc32xx-misc.h>

#define MODNAME "lpc-eth"
#define DRV_VERSION "1.00"

#define ENET_MAXF_SIZE 1536
#define ENET_RX_DESC 48
#define ENET_TX_DESC 16

#define NAPI_WEIGHT 16

/*
 * Ethernet MAC controller Register offsets
 */
#define LPC_ENET_MAC1(x)                        (x + 0x000)
#define LPC_ENET_MAC2(x)                        (x + 0x004)
#define LPC_ENET_IPGT(x)                        (x + 0x008)
#define LPC_ENET_IPGR(x)                        (x + 0x00C)
#define LPC_ENET_CLRT(x)                        (x + 0x010)
#define LPC_ENET_MAXF(x)                        (x + 0x014)
#define LPC_ENET_SUPP(x)                        (x + 0x018)
#define LPC_ENET_TEST(x)                        (x + 0x01C)
#define LPC_ENET_MCFG(x)                        (x + 0x020)
#define LPC_ENET_MCMD(x)                        (x + 0x024)
#define LPC_ENET_MADR(x)                        (x + 0x028)
#define LPC_ENET_MWTD(x)                        (x + 0x02C)
#define LPC_ENET_MRDD(x)                        (x + 0x030)
#define LPC_ENET_MIND(x)                        (x + 0x034)
#define LPC_ENET_SA0(x)                         (x + 0x040)
#define LPC_ENET_SA1(x)                         (x + 0x044)
#define LPC_ENET_SA2(x)                         (x + 0x048)
#define LPC_ENET_COMMAND(x)                     (x + 0x100)
#define LPC_ENET_STATUS(x)                      (x + 0x104)
#define LPC_ENET_RXDESCRIPTOR(x)                (x + 0x108)
#define LPC_ENET_RXSTATUS(x)                    (x + 0x10C)
#define LPC_ENET_RXDESCRIPTORNUMBER(x)          (x + 0x110)
#define LPC_ENET_RXPRODUCEINDEX(x)              (x + 0x114)
#define LPC_ENET_RXCONSUMEINDEX(x)              (x + 0x118)
#define LPC_ENET_TXDESCRIPTOR(x)                (x + 0x11C)
#define LPC_ENET_TXSTATUS(x)                    (x + 0x120)
#define LPC_ENET_TXDESCRIPTORNUMBER(x)          (x + 0x124)
#define LPC_ENET_TXPRODUCEINDEX(x)              (x + 0x128)
#define LPC_ENET_TXCONSUMEINDEX(x)              (x + 0x12C)
#define LPC_ENET_TSV0(x)                        (x + 0x158)
#define LPC_ENET_TSV1(x)                        (x + 0x15C)
#define LPC_ENET_RSV(x)                         (x + 0x160)
#define LPC_ENET_FLOWCONTROLCOUNTER(x)          (x + 0x170)
#define LPC_ENET_FLOWCONTROLSTATUS(x)           (x + 0x174)
#define LPC_ENET_RXFILTER_CTRL(x)               (x + 0x200)
#define LPC_ENET_RXFILTERWOLSTATUS(x)           (x + 0x204)
#define LPC_ENET_RXFILTERWOLCLEAR(x)            (x + 0x208)
#define LPC_ENET_HASHFILTERL(x)                 (x + 0x210)
#define LPC_ENET_HASHFILTERH(x)                 (x + 0x214)
#define LPC_ENET_INTSTATUS(x)                   (x + 0xFE0)
#define LPC_ENET_INTENABLE(x)                   (x + 0xFE4)
#define LPC_ENET_INTCLEAR(x)                    (x + 0xFE8)
#define LPC_ENET_INTSET(x)                      (x + 0xFEC)
#define LPC_ENET_POWERDOWN(x)                   (x + 0xFF4)

/*
 * mac1 register definitions
 */
#define LPC_MAC1_RECV_ENABLE                    (1 << 0)
#define LPC_MAC1_PASS_ALL_RX_FRAMES             (1 << 1)
#define LPC_MAC1_RX_FLOW_CONTROL                (1 << 2)
#define LPC_MAC1_TX_FLOW_CONTROL                (1 << 3)
#define LPC_MAC1_LOOPBACK                       (1 << 4)
#define LPC_MAC1_RESET_TX                       (1 << 8)
#define LPC_MAC1_RESET_MCS_TX                   (1 << 9)
#define LPC_MAC1_RESET_RX                       (1 << 10)
#define LPC_MAC1_RESET_MCS_RX                   (1 << 11)
#define LPC_MAC1_SIMULATION_RESET               (1 << 14)
#define LPC_MAC1_SOFT_RESET                     (1 << 15)

/*
 * mac2 register definitions
 */
#define LPC_MAC2_FULL_DUPLEX                    (1 << 0)
#define LPC_MAC2_FRAME_LENGTH_CHECKING          (1 << 1)
#define LPC_MAC2_HUGH_LENGTH_CHECKING           (1 << 2)
#define LPC_MAC2_DELAYED_CRC                    (1 << 3)
#define LPC_MAC2_CRC_ENABLE                     (1 << 4)
#define LPC_MAC2_PAD_CRC_ENABLE                 (1 << 5)
#define LPC_MAC2_VLAN_PAD_ENABLE                (1 << 6)
#define LPC_MAC2_AUTO_DETECT_PAD_ENABLE         (1 << 7)
#define LPC_MAC2_PURE_PREAMBLE_ENFORCEMENT      (1 << 8)
#define LPC_MAC2_LONG_PREAMBLE_ENFORCEMENT      (1 << 9)
#define LPC_MAC2_NO_BACKOFF                     (1 << 12)
#define LPC_MAC2_BACK_PRESSURE                  (1 << 13)
#define LPC_MAC2_EXCESS_DEFER                   (1 << 14)

/*
 * ipgt register definitions
 */
#define LPC_IPGT_LOAD(n)                        ((n) & 0x7F)

/*
 * ipgr register definitions
 */
#define LPC_IPGR_LOAD_PART2(n)                  ((n) & 0x7F)
#define LPC_IPGR_LOAD_PART1(n)                  (((n) & 0x7F) << 8)

/*
 * clrt register definitions
 */
#define LPC_CLRT_LOAD_RETRY_MAX(n)              ((n) & 0xF)
#define LPC_CLRT_LOAD_COLLISION_WINDOW(n)       (((n) & 0x3F) << 8)

/*
 * maxf register definitions
 */
#define LPC_MAXF_LOAD_MAX_FRAME_LEN(n)          ((n) & 0xFFFF)

/*
 * supp register definitions
 */
#define LPC_SUPP_SPEED                          (1 << 8)
#define LPC_SUPP_RESET_RMII                     (1 << 11)

/*
 * test register definitions
 */
#define LPC_TEST_SHORTCUT_PAUSE_QUANTA          (1 << 0)
#define LPC_TEST_PAUSE                          (1 << 1)
#define LPC_TEST_BACKPRESSURE                   (1 << 2)

/*
 * mcfg register definitions
 */
#define LPC_MCFG_SCAN_INCREMENT                 (1 << 0)
#define LPC_MCFG_SUPPRESS_PREAMBLE              (1 << 1)
#define LPC_MCFG_CLOCK_SELECT(n)                (((n) & 0x7) << 2)
#define LPC_MCFG_CLOCK_HOST_DIV_4               0
#define LPC_MCFG_CLOCK_HOST_DIV_6               2
#define LPC_MCFG_CLOCK_HOST_DIV_8               3
#define LPC_MCFG_CLOCK_HOST_DIV_10              4
#define LPC_MCFG_CLOCK_HOST_DIV_14              5
#define LPC_MCFG_CLOCK_HOST_DIV_20              6
#define LPC_MCFG_CLOCK_HOST_DIV_28              7
#define LPC_MCFG_RESET_MII_MGMT                 (1 << 15)

/*
 * mcmd register definitions
 */
#define LPC_MCMD_READ                           (1 << 0)
#define LPC_MCMD_SCAN                           (1 << 1)

/*
 * madr register definitions
 */
#define LPC_MADR_REGISTER_ADDRESS(n)            ((n) & 0x1F)
#define LPC_MADR_PHY_0ADDRESS(n)                (((n) & 0x1F) << 8)

/*
 * mwtd register definitions
 */
#define LPC_MWDT_WRITE(n)                       ((n) & 0xFFFF)

/*
 * mrdd register definitions
 */
#define LPC_MRDD_READ_MASK                      0xFFFF

/*
 * mind register definitions
 */
#define LPC_MIND_BUSY                           (1 << 0)
#define LPC_MIND_SCANNING                       (1 << 1)
#define LPC_MIND_NOT_VALID                      (1 << 2)
#define LPC_MIND_MII_LINK_FAIL                  (1 << 3)

/*
 * command register definitions
 */
#define LPC_COMMAND_RXENABLE                    (1 << 0)
#define LPC_COMMAND_TXENABLE                    (1 << 1)
#define LPC_COMMAND_REG_RESET                   (1 << 3)
#define LPC_COMMAND_TXRESET                     (1 << 4)
#define LPC_COMMAND_RXRESET                     (1 << 5)
#define LPC_COMMAND_PASSRUNTFRAME               (1 << 6)
#define LPC_COMMAND_PASSRXFILTER                (1 << 7)
#define LPC_COMMAND_TXFLOWCONTROL               (1 << 8)
#define LPC_COMMAND_RMII                        (1 << 9)
#define LPC_COMMAND_FULLDUPLEX                  (1 << 10)

/*
 * status register definitions
 */
#define LPC_STATUS_RXACTIVE                     (1 << 0)
#define LPC_STATUS_TXACTIVE                     (1 << 1)

/*
 * tsv0 register definitions
 */
#define LPC_TSV0_CRC_ERROR                      (1 << 0)
#define LPC_TSV0_LENGTH_CHECK_ERROR             (1 << 1)
#define LPC_TSV0_LENGTH_OUT_OF_RANGE            (1 << 2)
#define LPC_TSV0_DONE                           (1 << 3)
#define LPC_TSV0_MULTICAST                      (1 << 4)
#define LPC_TSV0_BROADCAST                      (1 << 5)
#define LPC_TSV0_PACKET_DEFER                   (1 << 6)
#define LPC_TSV0_ESCESSIVE_DEFER                (1 << 7)
#define LPC_TSV0_ESCESSIVE_COLLISION            (1 << 8)
#define LPC_TSV0_LATE_COLLISION                 (1 << 9)
#define LPC_TSV0_GIANT                          (1 << 10)
#define LPC_TSV0_UNDERRUN                       (1 << 11)
#define LPC_TSV0_TOTAL_BYTES(n)                 (((n) >> 12) & 0xFFFF)
#define LPC_TSV0_CONTROL_FRAME                  (1 << 28)
#define LPC_TSV0_PAUSE                          (1 << 29)
#define LPC_TSV0_BACKPRESSURE                   (1 << 30)
#define LPC_TSV0_VLAN                           (1 << 31)

/*
 * tsv1 register definitions
 */
#define LPC_TSV1_TRANSMIT_BYTE_COUNT(n)         ((n) & 0xFFFF)
#define LPC_TSV1_COLLISION_COUNT(n)             (((n) >> 16) & 0xF)

/*
 * rsv register definitions
 */
#define LPC_RSV_RECEIVED_BYTE_COUNT(n)          ((n) & 0xFFFF)
#define LPC_RSV_RXDV_EVENT_IGNORED              (1 << 16)
#define LPC_RSV_RXDV_EVENT_PREVIOUSLY_SEEN      (1 << 17)
#define LPC_RSV_CARRIER_EVNT_PREVIOUS_SEEN      (1 << 18)
#define LPC_RSV_RECEIVE_CODE_VIOLATION          (1 << 19)
#define LPC_RSV_CRC_ERROR                       (1 << 20)
#define LPC_RSV_LENGTH_CHECK_ERROR              (1 << 21)
#define LPC_RSV_LENGTH_OUT_OF_RANGE             (1 << 22)
#define LPC_RSV_RECEIVE_OK                      (1 << 23)
#define LPC_RSV_MULTICAST                       (1 << 24)
#define LPC_RSV_BROADCAST                       (1 << 25)
#define LPC_RSV_DRIBBLE_NIBBLE                  (1 << 26)
#define LPC_RSV_CONTROL_FRAME                   (1 << 27)
#define LPC_RSV_PAUSE                           (1 << 28)
#define LPC_RSV_UNSUPPORTED_OPCODE              (1 << 29)
#define LPC_RSV_VLAN                            (1 << 30)

/*
 * flowcontrolcounter register definitions
 */
#define LPC_FCCR_MIRRORCOUNTER(n)               ((n) & 0xFFFF)
#define LPC_FCCR_PAUSETIMER(n)                  (((n) >> 16) & 0xFFFF)

/*
 * flowcontrolstatus register definitions
 */
#define LPC_FCCR_MIRRORCOUNTERCURRENT(n)        ((n) & 0xFFFF)

/*
 * rxfilterctrl, rxfilterwolstatus, and rxfilterwolclear shared
 * register definitions
 */
#define LPC_RXFLTRW_ACCEPTUNICAST               (1 << 0)
#define LPC_RXFLTRW_ACCEPTUBROADCAST            (1 << 1)
#define LPC_RXFLTRW_ACCEPTUMULTICAST            (1 << 2)
#define LPC_RXFLTRW_ACCEPTUNICASTHASH           (1 << 3)
#define LPC_RXFLTRW_ACCEPTUMULTICASTHASH        (1 << 4)
#define LPC_RXFLTRW_ACCEPTPERFECT               (1 << 5)

/*
 * rxfilterctrl register definitions
 */
#define LPC_RXFLTRWSTS_MAGICPACKETENWOL         (1 << 12)
#define LPC_RXFLTRWSTS_RXFILTERENWOL            (1 << 13)

/*
 * rxfilterwolstatus/rxfilterwolclear register definitions
 */
#define LPC_RXFLTRWSTS_RXFILTERWOL              (1 << 7)
#define LPC_RXFLTRWSTS_MAGICPACKETWOL           (1 << 8)

/*
 * intstatus, intenable, intclear, and Intset shared register
 * definitions
 */
#define LPC_MACINT_RXOVERRUNINTEN               (1 << 0)
#define LPC_MACINT_RXERRORONINT                 (1 << 1)
#define LPC_MACINT_RXFINISHEDINTEN              (1 << 2)
#define LPC_MACINT_RXDONEINTEN                  (1 << 3)
#define LPC_MACINT_TXUNDERRUNINTEN              (1 << 4)
#define LPC_MACINT_TXERRORINTEN                 (1 << 5)
#define LPC_MACINT_TXFINISHEDINTEN              (1 << 6)
#define LPC_MACINT_TXDONEINTEN                  (1 << 7)
#define LPC_MACINT_SOFTINTEN                    (1 << 12)
#define LPC_MACINT_WAKEUPINTEN                  (1 << 13)

/*
 * powerdown register definitions
 */
#define LPC_POWERDOWN_MACAHB                    (1 << 31)

static phy_interface_t lpc_phy_interface_mode(struct device *dev)
{
        if (dev && dev->of_node) {
                const char *mode = of_get_property(dev->of_node,
                                                   "phy-mode", NULL);
                if (mode && !strcmp(mode, "mii"))
                        return PHY_INTERFACE_MODE_MII;
        }
        return PHY_INTERFACE_MODE_RMII;
}

static bool use_iram_for_net(struct device *dev)
{
        if (dev && dev->of_node)
                return of_property_read_bool(dev->of_node, "use-iram");
        return false;
}

/* Receive Status information word */
#define RXSTATUS_SIZE                   0x000007FF
#define RXSTATUS_CONTROL                (1 << 18)
#define RXSTATUS_VLAN                   (1 << 19)
#define RXSTATUS_FILTER                 (1 << 20)
#define RXSTATUS_MULTICAST              (1 << 21)
#define RXSTATUS_BROADCAST              (1 << 22)
#define RXSTATUS_CRC                    (1 << 23)
#define RXSTATUS_SYMBOL                 (1 << 24)
#define RXSTATUS_LENGTH                 (1 << 25)
#define RXSTATUS_RANGE                  (1 << 26)
#define RXSTATUS_ALIGN                  (1 << 27)
#define RXSTATUS_OVERRUN                (1 << 28)
#define RXSTATUS_NODESC                 (1 << 29)
#define RXSTATUS_LAST                   (1 << 30)
#define RXSTATUS_ERROR                  (1 << 31)

#define RXSTATUS_STATUS_ERROR \
        (RXSTATUS_NODESC | RXSTATUS_OVERRUN | RXSTATUS_ALIGN | \
         RXSTATUS_RANGE | RXSTATUS_LENGTH | RXSTATUS_SYMBOL | RXSTATUS_CRC)

/* Receive Descriptor control word */
#define RXDESC_CONTROL_SIZE             0x000007FF
#define RXDESC_CONTROL_INT              (1 << 31)

/* Transmit Status information word */
#define TXSTATUS_COLLISIONS_GET(x)      (((x) >> 21) & 0xF)
#define TXSTATUS_DEFER                  (1 << 25)
#define TXSTATUS_EXCESSDEFER            (1 << 26)
#define TXSTATUS_EXCESSCOLL             (1 << 27)
#define TXSTATUS_LATECOLL               (1 << 28)
#define TXSTATUS_UNDERRUN               (1 << 29)
#define TXSTATUS_NODESC                 (1 << 30)
#define TXSTATUS_ERROR                  (1 << 31)

/* Transmit Descriptor control word */
#define TXDESC_CONTROL_SIZE             0x000007FF
#define TXDESC_CONTROL_OVERRIDE         (1 << 26)
#define TXDESC_CONTROL_HUGE             (1 << 27)
#define TXDESC_CONTROL_PAD              (1 << 28)
#define TXDESC_CONTROL_CRC              (1 << 29)
#define TXDESC_CONTROL_LAST             (1 << 30)
#define TXDESC_CONTROL_INT              (1 << 31)

/*
 * Structure of a TX/RX descriptors and RX status
 */
struct txrx_desc_t {
        __le32 packet;
        __le32 control;
};
struct rx_status_t {
        __le32 statusinfo;
        __le32 statushashcrc;
};

/*
 * Device driver data structure
 */
struct netdata_local {
        struct platform_device  *pdev;
        struct net_device       *ndev;
        struct device_node      *phy_node;
        spinlock_t              lock;
        void __iomem            *net_base;
        u32                     msg_enable;
        unsigned int            skblen[ENET_TX_DESC];
        unsigned int            last_tx_idx;
        unsigned int            num_used_tx_buffs;
        struct mii_bus          *mii_bus;
        struct clk              *clk;
        dma_addr_t              dma_buff_base_p;
        void                    *dma_buff_base_v;
        size_t                  dma_buff_size;
        struct txrx_desc_t      *tx_desc_v;
        u32                     *tx_stat_v;
        void                    *tx_buff_v;
        struct txrx_desc_t      *rx_desc_v;
        struct rx_status_t      *rx_stat_v;
        void                    *rx_buff_v;
        int                     link;
        int                     speed;
        int                     duplex;
        struct napi_struct      napi;
};

/*
 * MAC support functions
 */
static void __lpc_set_mac(struct netdata_local *pldat, const u8 *mac)
{
        u32 tmp;

        /* Set station address */
        tmp = mac[0] | ((u32)mac[1] << 8);
        writel(tmp, LPC_ENET_SA2(pldat->net_base));
        tmp = mac[2] | ((u32)mac[3] << 8);
        writel(tmp, LPC_ENET_SA1(pldat->net_base));
        tmp = mac[4] | ((u32)mac[5] << 8);
        writel(tmp, LPC_ENET_SA0(pldat->net_base));

        netdev_dbg(pldat->ndev, "Ethernet MAC address %pM\n", mac);
}

static void __lpc_get_mac(struct netdata_local *pldat, u8 *mac)
{
        u32 tmp;

        /* Get station address */
        tmp = readl(LPC_ENET_SA2(pldat->net_base));
        mac[0] = tmp & 0xFF;
        mac[1] = tmp >> 8;
        tmp = readl(LPC_ENET_SA1(pldat->net_base));
        mac[2] = tmp & 0xFF;
        mac[3] = tmp >> 8;
        tmp = readl(LPC_ENET_SA0(pldat->net_base));
        mac[4] = tmp & 0xFF;
        mac[5] = tmp >> 8;
}

static void __lpc_params_setup(struct netdata_local *pldat)
{
        u32 tmp;

        if (pldat->duplex == DUPLEX_FULL) {
                tmp = readl(LPC_ENET_MAC2(pldat->net_base));
                tmp |= LPC_MAC2_FULL_DUPLEX;
                writel(tmp, LPC_ENET_MAC2(pldat->net_base));
                tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
                tmp |= LPC_COMMAND_FULLDUPLEX;
                writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
                writel(LPC_IPGT_LOAD(0x15), LPC_ENET_IPGT(pldat->net_base));
        } else {
                tmp = readl(LPC_ENET_MAC2(pldat->net_base));
                tmp &= ~LPC_MAC2_FULL_DUPLEX;
                writel(tmp, LPC_ENET_MAC2(pldat->net_base));
                tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
                tmp &= ~LPC_COMMAND_FULLDUPLEX;
                writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
                writel(LPC_IPGT_LOAD(0x12), LPC_ENET_IPGT(pldat->net_base));
        }

        if (pldat->speed == SPEED_100)
                writel(LPC_SUPP_SPEED, LPC_ENET_SUPP(pldat->net_base));
        else
                writel(0, LPC_ENET_SUPP(pldat->net_base));
}

static void __lpc_eth_reset(struct netdata_local *pldat)
{
        /* Reset all MAC logic */
        writel((LPC_MAC1_RESET_TX | LPC_MAC1_RESET_MCS_TX | LPC_MAC1_RESET_RX |
                LPC_MAC1_RESET_MCS_RX | LPC_MAC1_SIMULATION_RESET |
                LPC_MAC1_SOFT_RESET), LPC_ENET_MAC1(pldat->net_base));
        writel((LPC_COMMAND_REG_RESET | LPC_COMMAND_TXRESET |
                LPC_COMMAND_RXRESET), LPC_ENET_COMMAND(pldat->net_base));
}

static int __lpc_mii_mngt_reset(struct netdata_local *pldat)
{
        /* Reset MII management hardware */
        writel(LPC_MCFG_RESET_MII_MGMT, LPC_ENET_MCFG(pldat->net_base));

        /* Setup MII clock to slowest rate with a /28 divider */
        writel(LPC_MCFG_CLOCK_SELECT(LPC_MCFG_CLOCK_HOST_DIV_28),
               LPC_ENET_MCFG(pldat->net_base));

        return 0;
}

static inline phys_addr_t __va_to_pa(void *addr, struct netdata_local *pldat)
{
        phys_addr_t phaddr;

        phaddr = addr - pldat->dma_buff_base_v;
        phaddr += pldat->dma_buff_base_p;

        return phaddr;
}

static void lpc_eth_enable_int(void __iomem *regbase)
{
        writel((LPC_MACINT_RXDONEINTEN | LPC_MACINT_TXDONEINTEN),
               LPC_ENET_INTENABLE(regbase));
}

static void lpc_eth_disable_int(void __iomem *regbase)
{
        writel(0, LPC_ENET_INTENABLE(regbase));
}

/* Setup TX/RX descriptors */
static void __lpc_txrx_desc_setup(struct netdata_local *pldat)
{
        u32 *ptxstat;
        void *tbuff;
        int i;
        struct txrx_desc_t *ptxrxdesc;
        struct rx_status_t *prxstat;

        tbuff = PTR_ALIGN(pldat->dma_buff_base_v, 16);

        /* Setup TX descriptors, status, and buffers */
        pldat->tx_desc_v = tbuff;
        tbuff += sizeof(struct txrx_desc_t) * ENET_TX_DESC;

        pldat->tx_stat_v = tbuff;
        tbuff += sizeof(u32) * ENET_TX_DESC;

        tbuff = PTR_ALIGN(tbuff, 16);
        pldat->tx_buff_v = tbuff;
        tbuff += ENET_MAXF_SIZE * ENET_TX_DESC;

        /* Setup RX descriptors, status, and buffers */
        pldat->rx_desc_v = tbuff;
        tbuff += sizeof(struct txrx_desc_t) * ENET_RX_DESC;

        tbuff = PTR_ALIGN(tbuff, 16);
        pldat->rx_stat_v = tbuff;
        tbuff += sizeof(struct rx_status_t) * ENET_RX_DESC;

        tbuff = PTR_ALIGN(tbuff, 16);
        pldat->rx_buff_v = tbuff;
        tbuff += ENET_MAXF_SIZE * ENET_RX_DESC;

        /* Map the TX descriptors to the TX buffers in hardware */
        for (i = 0; i < ENET_TX_DESC; i++) {
                ptxstat = &pldat->tx_stat_v[i];
                ptxrxdesc = &pldat->tx_desc_v[i];

                ptxrxdesc->packet = __va_to_pa(
                                pldat->tx_buff_v + i * ENET_MAXF_SIZE, pldat);
                ptxrxdesc->control = 0;
                *ptxstat = 0;
        }

        /* Map the RX descriptors to the RX buffers in hardware */
        for (i = 0; i < ENET_RX_DESC; i++) {
                prxstat = &pldat->rx_stat_v[i];
                ptxrxdesc = &pldat->rx_desc_v[i];

                ptxrxdesc->packet = __va_to_pa(
                                pldat->rx_buff_v + i * ENET_MAXF_SIZE, pldat);
                ptxrxdesc->control = RXDESC_CONTROL_INT | (ENET_MAXF_SIZE - 1);
                prxstat->statusinfo = 0;
                prxstat->statushashcrc = 0;
        }

        /* Setup base addresses in hardware to point to buffers and
         * descriptors
         */
        writel((ENET_TX_DESC - 1),
               LPC_ENET_TXDESCRIPTORNUMBER(pldat->net_base));
        writel(__va_to_pa(pldat->tx_desc_v, pldat),
               LPC_ENET_TXDESCRIPTOR(pldat->net_base));
        writel(__va_to_pa(pldat->tx_stat_v, pldat),
               LPC_ENET_TXSTATUS(pldat->net_base));
        writel((ENET_RX_DESC - 1),
               LPC_ENET_RXDESCRIPTORNUMBER(pldat->net_base));
        writel(__va_to_pa(pldat->rx_desc_v, pldat),
               LPC_ENET_RXDESCRIPTOR(pldat->net_base));
        writel(__va_to_pa(pldat->rx_stat_v, pldat),
               LPC_ENET_RXSTATUS(pldat->net_base));
}

static void __lpc_eth_init(struct netdata_local *pldat)
{
        u32 tmp;

        /* Disable controller and reset */
        tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
        tmp &= ~LPC_COMMAND_RXENABLE | LPC_COMMAND_TXENABLE;
        writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
        tmp = readl(LPC_ENET_MAC1(pldat->net_base));
        tmp &= ~LPC_MAC1_RECV_ENABLE;
        writel(tmp, LPC_ENET_MAC1(pldat->net_base));

        /* Initial MAC setup */
        writel(LPC_MAC1_PASS_ALL_RX_FRAMES, LPC_ENET_MAC1(pldat->net_base));
        writel((LPC_MAC2_PAD_CRC_ENABLE | LPC_MAC2_CRC_ENABLE),
               LPC_ENET_MAC2(pldat->net_base));
        writel(ENET_MAXF_SIZE, LPC_ENET_MAXF(pldat->net_base));

        /* Collision window, gap */
        writel((LPC_CLRT_LOAD_RETRY_MAX(0xF) |
                LPC_CLRT_LOAD_COLLISION_WINDOW(0x37)),
               LPC_ENET_CLRT(pldat->net_base));
        writel(LPC_IPGR_LOAD_PART2(0x12), LPC_ENET_IPGR(pldat->net_base));

        if (lpc_phy_interface_mode(&pldat->pdev->dev) == PHY_INTERFACE_MODE_MII)
                writel(LPC_COMMAND_PASSRUNTFRAME,
                       LPC_ENET_COMMAND(pldat->net_base));
        else {
                writel((LPC_COMMAND_PASSRUNTFRAME | LPC_COMMAND_RMII),
                       LPC_ENET_COMMAND(pldat->net_base));
                writel(LPC_SUPP_RESET_RMII, LPC_ENET_SUPP(pldat->net_base));
        }

        __lpc_params_setup(pldat);

        /* Setup TX and RX descriptors */
        __lpc_txrx_desc_setup(pldat);

        /* Setup packet filtering */
        writel((LPC_RXFLTRW_ACCEPTUBROADCAST | LPC_RXFLTRW_ACCEPTPERFECT),
               LPC_ENET_RXFILTER_CTRL(pldat->net_base));

        /* Get the next TX buffer output index */
        pldat->num_used_tx_buffs = 0;
        pldat->last_tx_idx =
                readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));

        /* Clear and enable interrupts */
        writel(0xFFFF, LPC_ENET_INTCLEAR(pldat->net_base));
        smp_wmb();
        lpc_eth_enable_int(pldat->net_base);

        /* Enable controller */
        tmp = readl(LPC_ENET_COMMAND(pldat->net_base));
        tmp |= LPC_COMMAND_RXENABLE | LPC_COMMAND_TXENABLE;
        writel(tmp, LPC_ENET_COMMAND(pldat->net_base));
        tmp = readl(LPC_ENET_MAC1(pldat->net_base));
        tmp |= LPC_MAC1_RECV_ENABLE;
        writel(tmp, LPC_ENET_MAC1(pldat->net_base));
}

static void __lpc_eth_shutdown(struct netdata_local *pldat)
{
        /* Reset ethernet and power down PHY */
        __lpc_eth_reset(pldat);
        writel(0, LPC_ENET_MAC1(pldat->net_base));
        writel(0, LPC_ENET_MAC2(pldat->net_base));
}

/*
 * MAC<--->PHY support functions
 */
static int lpc_mdio_read(struct mii_bus *bus, int phy_id, int phyreg)
{
        struct netdata_local *pldat = bus->priv;
        unsigned long timeout = jiffies + msecs_to_jiffies(100);
        int lps;

        writel(((phy_id << 8) | phyreg), LPC_ENET_MADR(pldat->net_base));
        writel(LPC_MCMD_READ, LPC_ENET_MCMD(pldat->net_base));

        /* Wait for unbusy status */
        while (readl(LPC_ENET_MIND(pldat->net_base)) & LPC_MIND_BUSY) {
                if (time_after(jiffies, timeout))
                        return -EIO;
                cpu_relax();
        }

        lps = readl(LPC_ENET_MRDD(pldat->net_base));
        writel(0, LPC_ENET_MCMD(pldat->net_base));

        return lps;
}

static int lpc_mdio_write(struct mii_bus *bus, int phy_id, int phyreg,
                        u16 phydata)
{
        struct netdata_local *pldat = bus->priv;
        unsigned long timeout = jiffies + msecs_to_jiffies(100);

        writel(((phy_id << 8) | phyreg), LPC_ENET_MADR(pldat->net_base));
        writel(phydata, LPC_ENET_MWTD(pldat->net_base));

        /* Wait for completion */
        while (readl(LPC_ENET_MIND(pldat->net_base)) & LPC_MIND_BUSY) {
                if (time_after(jiffies, timeout))
                        return -EIO;
                cpu_relax();
        }

        return 0;
}

static int lpc_mdio_reset(struct mii_bus *bus)
{
        return __lpc_mii_mngt_reset((struct netdata_local *)bus->priv);
}

static void lpc_handle_link_change(struct net_device *ndev)
{
        struct netdata_local *pldat = netdev_priv(ndev);
        struct phy_device *phydev = ndev->phydev;
        unsigned long flags;

        bool status_change = false;

        spin_lock_irqsave(&pldat->lock, flags);

        if (phydev->link) {
                if ((pldat->speed != phydev->speed) ||
                    (pldat->duplex != phydev->duplex)) {
                        pldat->speed = phydev->speed;
                        pldat->duplex = phydev->duplex;
                        status_change = true;
                }
        }

        if (phydev->link != pldat->link) {
                if (!phydev->link) {
                        pldat->speed = 0;
                        pldat->duplex = -1;
                }
                pldat->link = phydev->link;

                status_change = true;
        }

        spin_unlock_irqrestore(&pldat->lock, flags);

        if (status_change)
                __lpc_params_setup(pldat);
}

static int lpc_mii_probe(struct net_device *ndev)
{
        struct netdata_local *pldat = netdev_priv(ndev);
        struct phy_device *phydev;

        /* Attach to the PHY */
        if (lpc_phy_interface_mode(&pldat->pdev->dev) == PHY_INTERFACE_MODE_MII)
                netdev_info(ndev, "using MII interface\n");
        else
                netdev_info(ndev, "using RMII interface\n");

        if (pldat->phy_node)
                phydev =  of_phy_find_device(pldat->phy_node);
        else
                phydev = phy_find_first(pldat->mii_bus);
        if (!phydev) {
                netdev_err(ndev, "no PHY found\n");
                return -ENODEV;
        }

        phydev = phy_connect(ndev, phydev_name(phydev),
                             &lpc_handle_link_change,
                             lpc_phy_interface_mode(&pldat->pdev->dev));
        if (IS_ERR(phydev)) {
                netdev_err(ndev, "Could not attach to PHY\n");
                return PTR_ERR(phydev);
        }

        phy_set_max_speed(phydev, SPEED_100);

        pldat->link = 0;
        pldat->speed = 0;
        pldat->duplex = -1;

        phy_attached_info(phydev);

        return 0;
}

static int lpc_mii_init(struct netdata_local *pldat)
{
        struct device_node *node;
        int err = -ENXIO;

        pldat->mii_bus = mdiobus_alloc();
        if (!pldat->mii_bus) {
                err = -ENOMEM;
                goto err_out;
        }

        /* Setup MII mode */
        if (lpc_phy_interface_mode(&pldat->pdev->dev) == PHY_INTERFACE_MODE_MII)
                writel(LPC_COMMAND_PASSRUNTFRAME,
                       LPC_ENET_COMMAND(pldat->net_base));
        else {
                writel((LPC_COMMAND_PASSRUNTFRAME | LPC_COMMAND_RMII),
                       LPC_ENET_COMMAND(pldat->net_base));
                writel(LPC_SUPP_RESET_RMII, LPC_ENET_SUPP(pldat->net_base));
        }

        pldat->mii_bus->name = "lpc_mii_bus";
        pldat->mii_bus->read = &lpc_mdio_read;
        pldat->mii_bus->write = &lpc_mdio_write;
        pldat->mii_bus->reset = &lpc_mdio_reset;
        snprintf(pldat->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
                 pldat->pdev->name, pldat->pdev->id);
        pldat->mii_bus->priv = pldat;
        pldat->mii_bus->parent = &pldat->pdev->dev;

        node = of_get_child_by_name(pldat->pdev->dev.of_node, "mdio");
        err = of_mdiobus_register(pldat->mii_bus, node);
        of_node_put(node);
        if (err)
                goto err_out_unregister_bus;

        err = lpc_mii_probe(pldat->ndev);
        if (err)
                goto err_out_unregister_bus;

        return 0;

err_out_unregister_bus:
        mdiobus_unregister(pldat->mii_bus);
        mdiobus_free(pldat->mii_bus);
err_out:
        return err;
}

static void __lpc_handle_xmit(struct net_device *ndev)
{
        struct netdata_local *pldat = netdev_priv(ndev);
        u32 txcidx, *ptxstat, txstat;

        txcidx = readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
        while (pldat->last_tx_idx != txcidx) {
                unsigned int skblen = pldat->skblen[pldat->last_tx_idx];

                /* A buffer is available, get buffer status */
                ptxstat = &pldat->tx_stat_v[pldat->last_tx_idx];
                txstat = *ptxstat;

                /* Next buffer and decrement used buffer counter */
                pldat->num_used_tx_buffs--;
                pldat->last_tx_idx++;
                if (pldat->last_tx_idx >= ENET_TX_DESC)
                        pldat->last_tx_idx = 0;

                /* Update collision counter */
                ndev->stats.collisions += TXSTATUS_COLLISIONS_GET(txstat);

                /* Any errors occurred? */
                if (txstat & TXSTATUS_ERROR) {
                        if (txstat & TXSTATUS_UNDERRUN) {
                                /* FIFO underrun */
                                ndev->stats.tx_fifo_errors++;
                        }
                        if (txstat & TXSTATUS_LATECOLL) {
                                /* Late collision */
                                ndev->stats.tx_aborted_errors++;
                        }
                        if (txstat & TXSTATUS_EXCESSCOLL) {
                                /* Excessive collision */
                                ndev->stats.tx_aborted_errors++;
                        }
                        if (txstat & TXSTATUS_EXCESSDEFER) {
                                /* Defer limit */
                                ndev->stats.tx_aborted_errors++;
                        }
                        ndev->stats.tx_errors++;
                } else {
                        /* Update stats */
                        ndev->stats.tx_packets++;
                        ndev->stats.tx_bytes += skblen;
                }

                txcidx = readl(LPC_ENET_TXCONSUMEINDEX(pldat->net_base));
        }

        if (pldat->num_used_tx_buffs <= ENET_TX_DESC/2) {
                if (netif_queue_stopped(ndev))
                        netif_wake_queue(ndev);
        }
}

static int __lpc_handle_recv(struct net_device *ndev, int budget)
{
        struct netdata_local *pldat = netdev_priv(ndev);
        struct sk_buff *skb;
        u32 rxconsidx, len, ethst;
        struct rx_status_t *prxstat;
        int rx_done = 0;

        /* Get the current RX buffer indexes */
        rxconsidx = readl(LPC_ENET_RXCONSUMEINDEX(pldat->net_base));
        while (rx_done < budget && rxconsidx !=
                        readl(LPC_ENET_RXPRODUCEINDEX(pldat->net_base))) {
                /* Get pointer to receive status */
                prxstat = &pldat->rx_stat_v[rxconsidx];
                len = (prxstat->statusinfo & RXSTATUS_SIZE) + 1;

                /* Status error? */
                ethst = prxstat->statusinfo;
                if ((ethst & (RXSTATUS_ERROR | RXSTATUS_STATUS_ERROR)) ==
                    (RXSTATUS_ERROR | RXSTATUS_RANGE))
                        ethst &= ~RXSTATUS_ERROR;

                if (ethst & RXSTATUS_ERROR) {
                        int si = prxstat->statusinfo;
                        /* Check statuses */
                        if (si & RXSTATUS_OVERRUN) {
                                /* Overrun error */
                                ndev->stats.rx_fifo_errors++;
                        } else if (si & RXSTATUS_CRC) {
                                /* CRC error */
                                ndev->stats.rx_crc_errors++;
                        } else if (si & RXSTATUS_LENGTH) {
                                /* Length error */
                                ndev->stats.rx_length_errors++;
                        } else if (si & RXSTATUS_ERROR) {
                                /* Other error */
                                ndev->stats.rx_length_errors++;
                        }
                        ndev->stats.rx_errors++;
                } else {
                        /* Packet is good */
                        skb = dev_alloc_skb(len);
                        if (!skb) {
                                ndev->stats.rx_dropped++;
                        } else {
                                /* Copy packet from buffer */
                                skb_put_data(skb,
                                             pldat->rx_buff_v + rxconsidx * ENET_MAXF_SIZE,
                                             len);

                                /* Pass to upper layer */
                                skb->protocol = eth_type_trans(skb, ndev);
                                netif_receive_skb(skb);
                                ndev->stats.rx_packets++;
                                ndev->stats.rx_bytes += len;
                        }
                }

                /* Increment consume index */
                rxconsidx = rxconsidx + 1;
                if (rxconsidx >= ENET_RX_DESC)
                        rxconsidx = 0;
                writel(rxconsidx,
                       LPC_ENET_RXCONSUMEINDEX(pldat->net_base));
                rx_done++;
        }

        return rx_done;
}

static int lpc_eth_poll(struct napi_struct *napi, int budget)
{
        struct netdata_local *pldat = container_of(napi,
                        struct netdata_local, napi);
        struct net_device *ndev = pldat->ndev;
        int rx_done = 0;
        struct netdev_queue *txq = netdev_get_tx_queue(ndev, 0);

        __netif_tx_lock(txq, smp_processor_id());
        __lpc_handle_xmit(ndev);
        __netif_tx_unlock(txq);
        rx_done = __lpc_handle_recv(ndev, budget);

        if (rx_done < budget) {
                napi_complete_done(napi, rx_done);
                lpc_eth_enable_int(pldat->net_base);
        }

        return rx_done;
}

static irqreturn_t __lpc_eth_interrupt(int irq, void *dev_id)
{
        struct net_device *ndev = dev_id;
        struct netdata_local *pldat = netdev_priv(ndev);
        u32 tmp;

        spin_lock(&pldat->lock);

        tmp = readl(LPC_ENET_INTSTATUS(pldat->net_base));
        /* Clear interrupts */
        writel(tmp, LPC_ENET_INTCLEAR(pldat->net_base));

        lpc_eth_disable_int(pldat->net_base);
        if (likely(napi_schedule_prep(&pldat->napi)))
                __napi_schedule(&pldat->napi);

        spin_unlock(&pldat->lock);

        return IRQ_HANDLED;
}

static int lpc_eth_close(struct net_device *ndev)
{
        unsigned long flags;
        struct netdata_local *pldat = netdev_priv(ndev);

        if (netif_msg_ifdown(pldat))
                dev_dbg(&pldat->pdev->dev, "shutting down %s\n", ndev->name);

        napi_disable(&pldat->napi);
        netif_stop_queue(ndev);

        spin_lock_irqsave(&pldat->lock, flags);
        __lpc_eth_reset(pldat);
        netif_carrier_off(ndev);
        writel(0, LPC_ENET_MAC1(pldat->net_base));
        writel(0, LPC_ENET_MAC2(pldat->net_base));
        spin_unlock_irqrestore(&pldat->lock, flags);

        if (ndev->phydev)
                phy_stop(ndev->phydev);
        clk_disable_unprepare(pldat->clk);

        return 0;
}

static netdev_tx_t lpc_eth_hard_start_xmit(struct sk_buff *skb,
                                           struct net_device *ndev)
{
        struct netdata_local *pldat = netdev_priv(ndev);
        u32 len, txidx;
        u32 *ptxstat;
        struct txrx_desc_t *ptxrxdesc;

        len = skb->len;

        spin_lock_irq(&pldat->lock);

        if (pldat->num_used_tx_buffs >= (ENET_TX_DESC - 1)) {
                /* This function should never be called when there are no
                 * buffers
                 */
                netif_stop_queue(ndev);
                spin_unlock_irq(&pldat->lock);
                WARN(1, "BUG! TX request when no free TX buffers!\n");
                return NETDEV_TX_BUSY;
        }

        /* Get the next TX descriptor index */
        txidx = readl(LPC_ENET_TXPRODUCEINDEX(pldat->net_base));

        /* Setup control for the transfer */
        ptxstat = &pldat->tx_stat_v[txidx];
        *ptxstat = 0;
        ptxrxdesc = &pldat->tx_desc_v[txidx];
        ptxrxdesc->control =
                (len - 1) | TXDESC_CONTROL_LAST | TXDESC_CONTROL_INT;

        /* Copy data to the DMA buffer */
        memcpy(pldat->tx_buff_v + txidx * ENET_MAXF_SIZE, skb->data, len);

        /* Save the buffer and increment the buffer counter */
        pldat->skblen[txidx] = len;
        pldat->num_used_tx_buffs++;

        /* Start transmit */
        txidx++;
        if (txidx >= ENET_TX_DESC)
                txidx = 0;
        writel(txidx, LPC_ENET_TXPRODUCEINDEX(pldat->net_base));

        /* Stop queue if no more TX buffers */
        if (pldat->num_used_tx_buffs >= (ENET_TX_DESC - 1))
                netif_stop_queue(ndev);

        spin_unlock_irq(&pldat->lock);

        dev_kfree_skb(skb);
        return NETDEV_TX_OK;
}

static int lpc_set_mac_address(struct net_device *ndev, void *p)
{
        struct sockaddr *addr = p;
        struct netdata_local *pldat = netdev_priv(ndev);
        unsigned long flags;

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

        spin_lock_irqsave(&pldat->lock, flags);

        /* Set station address */
        __lpc_set_mac(pldat, ndev->dev_addr);

        spin_unlock_irqrestore(&pldat->lock, flags);

        return 0;
}

static void lpc_eth_set_multicast_list(struct net_device *ndev)
{
        struct netdata_local *pldat = netdev_priv(ndev);
        struct netdev_hw_addr_list *mcptr = &ndev->mc;
        struct netdev_hw_addr *ha;
        u32 tmp32, hash_val, hashlo, hashhi;
        unsigned long flags;

        spin_lock_irqsave(&pldat->lock, flags);

        /* Set station address */
        __lpc_set_mac(pldat, ndev->dev_addr);

        tmp32 =  LPC_RXFLTRW_ACCEPTUBROADCAST | LPC_RXFLTRW_ACCEPTPERFECT;

        if (ndev->flags & IFF_PROMISC)
                tmp32 |= LPC_RXFLTRW_ACCEPTUNICAST |
                        LPC_RXFLTRW_ACCEPTUMULTICAST;
        if (ndev->flags & IFF_ALLMULTI)
                tmp32 |= LPC_RXFLTRW_ACCEPTUMULTICAST;

        if (netdev_hw_addr_list_count(mcptr))
                tmp32 |= LPC_RXFLTRW_ACCEPTUMULTICASTHASH;

        writel(tmp32, LPC_ENET_RXFILTER_CTRL(pldat->net_base));


        /* Set initial hash table */
        hashlo = 0x0;
        hashhi = 0x0;

        /* 64 bits : multicast address in hash table */
        netdev_hw_addr_list_for_each(ha, mcptr) {
                hash_val = (ether_crc(6, ha->addr) >> 23) & 0x3F;

                if (hash_val >= 32)
                        hashhi |= 1 << (hash_val - 32);
                else
                        hashlo |= 1 << hash_val;
        }

        writel(hashlo, LPC_ENET_HASHFILTERL(pldat->net_base));
        writel(hashhi, LPC_ENET_HASHFILTERH(pldat->net_base));

        spin_unlock_irqrestore(&pldat->lock, flags);
}

static int lpc_eth_open(struct net_device *ndev)
{
        struct netdata_local *pldat = netdev_priv(ndev);
        int ret;

        if (netif_msg_ifup(pldat))
                dev_dbg(&pldat->pdev->dev, "enabling %s\n", ndev->name);

        ret = clk_prepare_enable(pldat->clk);
        if (ret)
                return ret;

        /* Suspended PHY makes LPC ethernet core block, so resume now */
        phy_resume(ndev->phydev);

        /* Reset and initialize */
        __lpc_eth_reset(pldat);
        __lpc_eth_init(pldat);

        /* schedule a link state check */
        phy_start(ndev->phydev);
        netif_start_queue(ndev);
        napi_enable(&pldat->napi);

        return 0;
}

/*
 * Ethtool ops
 */
static void lpc_eth_ethtool_getdrvinfo(struct net_device *ndev,
        struct ethtool_drvinfo *info)
{
        strscpy(info->driver, MODNAME, sizeof(info->driver));
        strscpy(info->version, DRV_VERSION, sizeof(info->version));
        strscpy(info->bus_info, dev_name(ndev->dev.parent),
                sizeof(info->bus_info));
}

static u32 lpc_eth_ethtool_getmsglevel(struct net_device *ndev)
{
        struct netdata_local *pldat = netdev_priv(ndev);

        return pldat->msg_enable;
}

static void lpc_eth_ethtool_setmsglevel(struct net_device *ndev, u32 level)
{
        struct netdata_local *pldat = netdev_priv(ndev);

        pldat->msg_enable = level;
}

static const struct ethtool_ops lpc_eth_ethtool_ops = {
        .get_drvinfo    = lpc_eth_ethtool_getdrvinfo,
        .get_msglevel   = lpc_eth_ethtool_getmsglevel,
        .set_msglevel   = lpc_eth_ethtool_setmsglevel,
        .get_link       = ethtool_op_get_link,
        .get_link_ksettings = phy_ethtool_get_link_ksettings,
        .set_link_ksettings = phy_ethtool_set_link_ksettings,
};

static const struct net_device_ops lpc_netdev_ops = {
        .ndo_open               = lpc_eth_open,
        .ndo_stop               = lpc_eth_close,
        .ndo_start_xmit         = lpc_eth_hard_start_xmit,
        .ndo_set_rx_mode        = lpc_eth_set_multicast_list,
        .ndo_eth_ioctl          = phy_do_ioctl_running,
        .ndo_set_mac_address    = lpc_set_mac_address,
        .ndo_validate_addr      = eth_validate_addr,
};

static int lpc_eth_drv_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct device_node *np = dev->of_node;
        struct netdata_local *pldat;
        struct net_device *ndev;
        dma_addr_t dma_handle;
        struct resource *res;
        u8 addr[ETH_ALEN];
        int irq, ret;

        /* Setup network interface for RMII or MII mode */
        lpc32xx_set_phy_interface_mode(lpc_phy_interface_mode(dev));

        /* Get platform resources */
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        irq = platform_get_irq(pdev, 0);
        if (!res || irq < 0) {
                dev_err(dev, "error getting resources.\n");
                ret = -ENXIO;
                goto err_exit;
        }

        /* Allocate net driver data structure */
        ndev = alloc_etherdev(sizeof(struct netdata_local));
        if (!ndev) {
                dev_err(dev, "could not allocate device.\n");
                ret = -ENOMEM;
                goto err_exit;
        }

        SET_NETDEV_DEV(ndev, dev);

        pldat = netdev_priv(ndev);
        pldat->pdev = pdev;
        pldat->ndev = ndev;

        spin_lock_init(&pldat->lock);

        /* Save resources */
        ndev->irq = irq;

        /* Get clock for the device */
        pldat->clk = clk_get(dev, NULL);
        if (IS_ERR(pldat->clk)) {
                dev_err(dev, "error getting clock.\n");
                ret = PTR_ERR(pldat->clk);
                goto err_out_free_dev;
        }

        /* Enable network clock */
        ret = clk_prepare_enable(pldat->clk);
        if (ret)
                goto err_out_clk_put;

        /* Map IO space */
        pldat->net_base = ioremap(res->start, resource_size(res));
        if (!pldat->net_base) {
                dev_err(dev, "failed to map registers\n");
                ret = -ENOMEM;
                goto err_out_disable_clocks;
        }
        ret = request_irq(ndev->irq, __lpc_eth_interrupt, 0,
                          ndev->name, ndev);
        if (ret) {
                dev_err(dev, "error requesting interrupt.\n");
                goto err_out_iounmap;
        }

        /* Setup driver functions */
        ndev->netdev_ops = &lpc_netdev_ops;
        ndev->ethtool_ops = &lpc_eth_ethtool_ops;
        ndev->watchdog_timeo = msecs_to_jiffies(2500);

        /* Get size of DMA buffers/descriptors region */
        pldat->dma_buff_size = (ENET_TX_DESC + ENET_RX_DESC) * (ENET_MAXF_SIZE +
                sizeof(struct txrx_desc_t) + sizeof(struct rx_status_t));

        if (use_iram_for_net(dev)) {
                if (pldat->dma_buff_size >
                    lpc32xx_return_iram(&pldat->dma_buff_base_v, &dma_handle)) {
                        pldat->dma_buff_base_v = NULL;
                        pldat->dma_buff_size = 0;
                        netdev_err(ndev,
                                "IRAM not big enough for net buffers, using SDRAM instead.\n");
                }
        }

        if (pldat->dma_buff_base_v == NULL) {
                ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
                if (ret)
                        goto err_out_free_irq;

                pldat->dma_buff_size = PAGE_ALIGN(pldat->dma_buff_size);

                /* Allocate a chunk of memory for the DMA ethernet buffers
                 * and descriptors
                 */
                pldat->dma_buff_base_v =
                        dma_alloc_coherent(dev,
                                           pldat->dma_buff_size, &dma_handle,
                                           GFP_KERNEL);
                if (pldat->dma_buff_base_v == NULL) {
                        ret = -ENOMEM;
                        goto err_out_free_irq;
                }
        }
        pldat->dma_buff_base_p = dma_handle;

        netdev_dbg(ndev, "IO address space     :%pR\n", res);
        netdev_dbg(ndev, "IO address size      :%zd\n",
                        (size_t)resource_size(res));
        netdev_dbg(ndev, "IO address (mapped)  :0x%p\n",
                        pldat->net_base);
        netdev_dbg(ndev, "IRQ number           :%d\n", ndev->irq);
        netdev_dbg(ndev, "DMA buffer size      :%zd\n", pldat->dma_buff_size);
        netdev_dbg(ndev, "DMA buffer P address :%pad\n",
                        &pldat->dma_buff_base_p);
        netdev_dbg(ndev, "DMA buffer V address :0x%p\n",
                        pldat->dma_buff_base_v);

        pldat->phy_node = of_parse_phandle(np, "phy-handle", 0);

        /* Get MAC address from current HW setting (POR state is all zeros) */
        __lpc_get_mac(pldat, addr);
        eth_hw_addr_set(ndev, addr);

        if (!is_valid_ether_addr(ndev->dev_addr)) {
                of_get_ethdev_address(np, ndev);
        }
        if (!is_valid_ether_addr(ndev->dev_addr))
                eth_hw_addr_random(ndev);

        /* then shut everything down to save power */
        __lpc_eth_shutdown(pldat);

        /* Set default parameters */
        pldat->msg_enable = NETIF_MSG_LINK;

        /* Force an MII interface reset and clock setup */
        __lpc_mii_mngt_reset(pldat);

        /* Force default PHY interface setup in chip, this will probably be
         * changed by the PHY driver
         */
        pldat->link = 0;
        pldat->speed = 100;
        pldat->duplex = DUPLEX_FULL;
        __lpc_params_setup(pldat);

        netif_napi_add_weight(ndev, &pldat->napi, lpc_eth_poll, NAPI_WEIGHT);

        ret = register_netdev(ndev);
        if (ret) {
                dev_err(dev, "Cannot register net device, aborting.\n");
                goto err_out_dma_unmap;
        }
        platform_set_drvdata(pdev, ndev);

        ret = lpc_mii_init(pldat);
        if (ret)
                goto err_out_unregister_netdev;

        netdev_info(ndev, "LPC mac at 0x%08lx irq %d\n",
               (unsigned long)res->start, ndev->irq);

        device_init_wakeup(dev, 1);
        device_set_wakeup_enable(dev, 0);

        return 0;

err_out_unregister_netdev:
        unregister_netdev(ndev);
err_out_dma_unmap:
        if (!use_iram_for_net(dev) ||
            pldat->dma_buff_size > lpc32xx_return_iram(NULL, NULL))
                dma_free_coherent(dev, pldat->dma_buff_size,
                                  pldat->dma_buff_base_v,
                                  pldat->dma_buff_base_p);
err_out_free_irq:
        free_irq(ndev->irq, ndev);
err_out_iounmap:
        iounmap(pldat->net_base);
err_out_disable_clocks:
        clk_disable_unprepare(pldat->clk);
err_out_clk_put:
        clk_put(pldat->clk);
err_out_free_dev:
        free_netdev(ndev);
err_exit:
        pr_err("%s: not found (%d).\n", MODNAME, ret);
        return ret;
}

static void lpc_eth_drv_remove(struct platform_device *pdev)
{
        struct net_device *ndev = platform_get_drvdata(pdev);
        struct netdata_local *pldat = netdev_priv(ndev);

        unregister_netdev(ndev);

        if (!use_iram_for_net(&pldat->pdev->dev) ||
            pldat->dma_buff_size > lpc32xx_return_iram(NULL, NULL))
                dma_free_coherent(&pldat->pdev->dev, pldat->dma_buff_size,
                                  pldat->dma_buff_base_v,
                                  pldat->dma_buff_base_p);
        free_irq(ndev->irq, ndev);
        iounmap(pldat->net_base);
        mdiobus_unregister(pldat->mii_bus);
        mdiobus_free(pldat->mii_bus);
        clk_disable_unprepare(pldat->clk);
        clk_put(pldat->clk);
        free_netdev(ndev);
}

#ifdef CONFIG_PM
static int lpc_eth_drv_suspend(struct platform_device *pdev,
        pm_message_t state)
{
        struct net_device *ndev = platform_get_drvdata(pdev);
        struct netdata_local *pldat = netdev_priv(ndev);

        if (device_may_wakeup(&pdev->dev))
                enable_irq_wake(ndev->irq);

        if (ndev) {
                if (netif_running(ndev)) {
                        netif_device_detach(ndev);
                        __lpc_eth_shutdown(pldat);
                        clk_disable_unprepare(pldat->clk);

                        /*
                         * Reset again now clock is disable to be sure
                         * EMC_MDC is down
                         */
                        __lpc_eth_reset(pldat);
                }
        }

        return 0;
}

static int lpc_eth_drv_resume(struct platform_device *pdev)
{
        struct net_device *ndev = platform_get_drvdata(pdev);
        struct netdata_local *pldat;
        int ret;

        if (device_may_wakeup(&pdev->dev))
                disable_irq_wake(ndev->irq);

        if (ndev) {
                if (netif_running(ndev)) {
                        pldat = netdev_priv(ndev);

                        /* Enable interface clock */
                        ret = clk_enable(pldat->clk);
                        if (ret)
                                return ret;

                        /* Reset and initialize */
                        __lpc_eth_reset(pldat);
                        __lpc_eth_init(pldat);

                        netif_device_attach(ndev);
                }
        }

        return 0;
}
#endif

static const struct of_device_id lpc_eth_match[] = {
        { .compatible = "nxp,lpc-eth" },
        { }
};
MODULE_DEVICE_TABLE(of, lpc_eth_match);

static struct platform_driver lpc_eth_driver = {
        .probe          = lpc_eth_drv_probe,
        .remove         = lpc_eth_drv_remove,
#ifdef CONFIG_PM
        .suspend        = lpc_eth_drv_suspend,
        .resume         = lpc_eth_drv_resume,
#endif
        .driver         = {
                .name   = MODNAME,
                .of_match_table = lpc_eth_match,
        },
};

module_platform_driver(lpc_eth_driver);

MODULE_AUTHOR("Kevin Wells <kevin.wells@nxp.com>");
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
MODULE_DESCRIPTION("LPC Ethernet Driver");
MODULE_LICENSE("GPL");