/*
 * Copyright 2008-2015 Freescale Semiconductor Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Freescale Semiconductor nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation, either version 2 of that License or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "fman_memac.h"
#include "fman.h"

#include <linux/slab.h>
#include <linux/io.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/of_mdio.h>

/* PCS registers */
#define MDIO_SGMII_CR                   0x00
#define MDIO_SGMII_DEV_ABIL_SGMII       0x04
#define MDIO_SGMII_LINK_TMR_L           0x12
#define MDIO_SGMII_LINK_TMR_H           0x13
#define MDIO_SGMII_IF_MODE              0x14

/* SGMII Control defines */
#define SGMII_CR_AN_EN                  0x1000
#define SGMII_CR_RESTART_AN             0x0200
#define SGMII_CR_FD                     0x0100
#define SGMII_CR_SPEED_SEL1_1G          0x0040
#define SGMII_CR_DEF_VAL                (SGMII_CR_AN_EN | SGMII_CR_FD | \
                                         SGMII_CR_SPEED_SEL1_1G)

/* SGMII Device Ability for SGMII defines */
#define MDIO_SGMII_DEV_ABIL_SGMII_MODE  0x4001
#define MDIO_SGMII_DEV_ABIL_BASEX_MODE  0x01A0

/* Link timer define */
#define LINK_TMR_L                      0xa120
#define LINK_TMR_H                      0x0007
#define LINK_TMR_L_BASEX                0xaf08
#define LINK_TMR_H_BASEX                0x002f

/* SGMII IF Mode defines */
#define IF_MODE_USE_SGMII_AN            0x0002
#define IF_MODE_SGMII_EN                0x0001
#define IF_MODE_SGMII_SPEED_100M        0x0004
#define IF_MODE_SGMII_SPEED_1G          0x0008
#define IF_MODE_SGMII_DUPLEX_HALF       0x0010

/* Num of additional exact match MAC adr regs */
#define MEMAC_NUM_OF_PADDRS 7

/* Control and Configuration Register (COMMAND_CONFIG) */
#define CMD_CFG_REG_LOWP_RXETY  0x01000000 /* 07 Rx low power indication */
#define CMD_CFG_TX_LOWP_ENA     0x00800000 /* 08 Tx Low Power Idle Enable */
#define CMD_CFG_PFC_MODE        0x00080000 /* 12 Enable PFC */
#define CMD_CFG_NO_LEN_CHK      0x00020000 /* 14 Payload length check disable */
#define CMD_CFG_SW_RESET        0x00001000 /* 19 S/W Reset, self clearing bit */
#define CMD_CFG_TX_PAD_EN       0x00000800 /* 20 Enable Tx padding of frames */
#define CMD_CFG_PAUSE_IGNORE    0x00000100 /* 23 Ignore Pause frame quanta */
#define CMD_CFG_CRC_FWD         0x00000040 /* 25 Terminate/frwd CRC of frames */
#define CMD_CFG_PAD_EN          0x00000020 /* 26 Frame padding removal */
#define CMD_CFG_PROMIS_EN       0x00000010 /* 27 Promiscuous operation enable */
#define CMD_CFG_RX_EN           0x00000002 /* 30 MAC receive path enable */
#define CMD_CFG_TX_EN           0x00000001 /* 31 MAC transmit path enable */

/* Transmit FIFO Sections Register (TX_FIFO_SECTIONS) */
#define TX_FIFO_SECTIONS_TX_EMPTY_MASK                  0xFFFF0000
#define TX_FIFO_SECTIONS_TX_AVAIL_MASK                  0x0000FFFF
#define TX_FIFO_SECTIONS_TX_EMPTY_DEFAULT_10G           0x00400000
#define TX_FIFO_SECTIONS_TX_EMPTY_DEFAULT_1G            0x00100000
#define TX_FIFO_SECTIONS_TX_AVAIL_10G                   0x00000019
#define TX_FIFO_SECTIONS_TX_AVAIL_1G                    0x00000020
#define TX_FIFO_SECTIONS_TX_AVAIL_SLOW_10G              0x00000060

#define GET_TX_EMPTY_DEFAULT_VALUE(_val)                                \
do {                                                                    \
        _val &= ~TX_FIFO_SECTIONS_TX_EMPTY_MASK;                        \
        ((_val == TX_FIFO_SECTIONS_TX_AVAIL_10G) ?                      \
                        (_val |= TX_FIFO_SECTIONS_TX_EMPTY_DEFAULT_10G) :\
                        (_val |= TX_FIFO_SECTIONS_TX_EMPTY_DEFAULT_1G));\
} while (0)

/* Interface Mode Register (IF_MODE) */

#define IF_MODE_MASK            0x00000003 /* 30-31 Mask on i/f mode bits */
#define IF_MODE_XGMII           0x00000000 /* 30-31 XGMII (10G) interface */
#define IF_MODE_GMII            0x00000002 /* 30-31 GMII (1G) interface */
#define IF_MODE_RGMII           0x00000004
#define IF_MODE_RGMII_AUTO      0x00008000
#define IF_MODE_RGMII_1000      0x00004000 /* 10 - 1000Mbps RGMII */
#define IF_MODE_RGMII_100       0x00000000 /* 00 - 100Mbps RGMII */
#define IF_MODE_RGMII_10        0x00002000 /* 01 - 10Mbps RGMII */
#define IF_MODE_RGMII_SP_MASK   0x00006000 /* Setsp mask bits */
#define IF_MODE_RGMII_FD        0x00001000 /* Full duplex RGMII */
#define IF_MODE_HD              0x00000040 /* Half duplex operation */

/* Hash table Control Register (HASHTABLE_CTRL) */
#define HASH_CTRL_MCAST_EN      0x00000100
/* 26-31 Hash table address code */
#define HASH_CTRL_ADDR_MASK     0x0000003F
/* MAC mcast indication */
#define GROUP_ADDRESS           0x0000010000000000LL
#define HASH_TABLE_SIZE         64      /* Hash tbl size */

/* Interrupt Mask Register (IMASK) */
#define MEMAC_IMASK_MGI         0x40000000 /* 1 Magic pkt detect indication */
#define MEMAC_IMASK_TSECC_ER    0x20000000 /* 2 Timestamp FIFO ECC error evnt */
#define MEMAC_IMASK_TECC_ER     0x02000000 /* 6 Transmit frame ECC error evnt */
#define MEMAC_IMASK_RECC_ER     0x01000000 /* 7 Receive frame ECC error evnt */

#define MEMAC_ALL_ERRS_IMASK                                    \
                ((u32)(MEMAC_IMASK_TSECC_ER     |       \
                       MEMAC_IMASK_TECC_ER              |       \
                       MEMAC_IMASK_RECC_ER              |       \
                       MEMAC_IMASK_MGI))

#define MEMAC_IEVNT_PCS                 0x80000000 /* PCS (XG). Link sync (G) */
#define MEMAC_IEVNT_AN                  0x40000000 /* Auto-negotiation */
#define MEMAC_IEVNT_LT                  0x20000000 /* Link Training/New page */
#define MEMAC_IEVNT_MGI                 0x00004000 /* Magic pkt detection */
#define MEMAC_IEVNT_TS_ECC_ER           0x00002000 /* Timestamp FIFO ECC error*/
#define MEMAC_IEVNT_RX_FIFO_OVFL        0x00001000 /* Rx FIFO overflow */
#define MEMAC_IEVNT_TX_FIFO_UNFL        0x00000800 /* Tx FIFO underflow */
#define MEMAC_IEVNT_TX_FIFO_OVFL        0x00000400 /* Tx FIFO overflow */
#define MEMAC_IEVNT_TX_ECC_ER           0x00000200 /* Tx frame ECC error */
#define MEMAC_IEVNT_RX_ECC_ER           0x00000100 /* Rx frame ECC error */
#define MEMAC_IEVNT_LI_FAULT            0x00000080 /* Link Interruption flt */
#define MEMAC_IEVNT_RX_EMPTY            0x00000040 /* Rx FIFO empty */
#define MEMAC_IEVNT_TX_EMPTY            0x00000020 /* Tx FIFO empty */
#define MEMAC_IEVNT_RX_LOWP             0x00000010 /* Low Power Idle */
#define MEMAC_IEVNT_PHY_LOS             0x00000004 /* Phy loss of signal */
#define MEMAC_IEVNT_REM_FAULT           0x00000002 /* Remote fault (XGMII) */
#define MEMAC_IEVNT_LOC_FAULT           0x00000001 /* Local fault (XGMII) */

#define DEFAULT_PAUSE_QUANTA    0xf000
#define DEFAULT_FRAME_LENGTH    0x600
#define DEFAULT_TX_IPG_LENGTH   12

#define CLXY_PAUSE_QUANTA_CLX_PQNT      0x0000FFFF
#define CLXY_PAUSE_QUANTA_CLY_PQNT      0xFFFF0000
#define CLXY_PAUSE_THRESH_CLX_QTH       0x0000FFFF
#define CLXY_PAUSE_THRESH_CLY_QTH       0xFFFF0000

struct mac_addr {
        /* Lower 32 bits of 48-bit MAC address */
        u32 mac_addr_l;
        /* Upper 16 bits of 48-bit MAC address */
        u32 mac_addr_u;
};

/* memory map */
struct memac_regs {
        u32 res0000[2];                 /* General Control and Status */
        u32 command_config;             /* 0x008 Ctrl and cfg */
        struct mac_addr mac_addr0;      /* 0x00C-0x010 MAC_ADDR_0...1 */
        u32 maxfrm;                     /* 0x014 Max frame length */
        u32 res0018[1];
        u32 rx_fifo_sections;           /* Receive FIFO configuration reg */
        u32 tx_fifo_sections;           /* Transmit FIFO configuration reg */
        u32 res0024[2];
        u32 hashtable_ctrl;             /* 0x02C Hash table control */
        u32 res0030[4];
        u32 ievent;                     /* 0x040 Interrupt event */
        u32 tx_ipg_length;              /* 0x044 Transmitter inter-packet-gap */
        u32 res0048;
        u32 imask;                      /* 0x04C Interrupt mask */
        u32 res0050;
        u32 pause_quanta[4];            /* 0x054 Pause quanta */
        u32 pause_thresh[4];            /* 0x064 Pause quanta threshold */
        u32 rx_pause_status;            /* 0x074 Receive pause status */
        u32 res0078[2];
        struct mac_addr mac_addr[MEMAC_NUM_OF_PADDRS];/* 0x80-0x0B4 mac padr */
        u32 lpwake_timer;               /* 0x0B8 Low Power Wakeup Timer */
        u32 sleep_timer;                /* 0x0BC Transmit EEE Low Power Timer */
        u32 res00c0[8];
        u32 statn_config;               /* 0x0E0 Statistics configuration */
        u32 res00e4[7];
        /* Rx Statistics Counter */
        u32 reoct_l;
        u32 reoct_u;
        u32 roct_l;
        u32 roct_u;
        u32 raln_l;
        u32 raln_u;
        u32 rxpf_l;
        u32 rxpf_u;
        u32 rfrm_l;
        u32 rfrm_u;
        u32 rfcs_l;
        u32 rfcs_u;
        u32 rvlan_l;
        u32 rvlan_u;
        u32 rerr_l;
        u32 rerr_u;
        u32 ruca_l;
        u32 ruca_u;
        u32 rmca_l;
        u32 rmca_u;
        u32 rbca_l;
        u32 rbca_u;
        u32 rdrp_l;
        u32 rdrp_u;
        u32 rpkt_l;
        u32 rpkt_u;
        u32 rund_l;
        u32 rund_u;
        u32 r64_l;
        u32 r64_u;
        u32 r127_l;
        u32 r127_u;
        u32 r255_l;
        u32 r255_u;
        u32 r511_l;
        u32 r511_u;
        u32 r1023_l;
        u32 r1023_u;
        u32 r1518_l;
        u32 r1518_u;
        u32 r1519x_l;
        u32 r1519x_u;
        u32 rovr_l;
        u32 rovr_u;
        u32 rjbr_l;
        u32 rjbr_u;
        u32 rfrg_l;
        u32 rfrg_u;
        u32 rcnp_l;
        u32 rcnp_u;
        u32 rdrntp_l;
        u32 rdrntp_u;
        u32 res01d0[12];
        /* Tx Statistics Counter */
        u32 teoct_l;
        u32 teoct_u;
        u32 toct_l;
        u32 toct_u;
        u32 res0210[2];
        u32 txpf_l;
        u32 txpf_u;
        u32 tfrm_l;
        u32 tfrm_u;
        u32 tfcs_l;
        u32 tfcs_u;
        u32 tvlan_l;
        u32 tvlan_u;
        u32 terr_l;
        u32 terr_u;
        u32 tuca_l;
        u32 tuca_u;
        u32 tmca_l;
        u32 tmca_u;
        u32 tbca_l;
        u32 tbca_u;
        u32 res0258[2];
        u32 tpkt_l;
        u32 tpkt_u;
        u32 tund_l;
        u32 tund_u;
        u32 t64_l;
        u32 t64_u;
        u32 t127_l;
        u32 t127_u;
        u32 t255_l;
        u32 t255_u;
        u32 t511_l;
        u32 t511_u;
        u32 t1023_l;
        u32 t1023_u;
        u32 t1518_l;
        u32 t1518_u;
        u32 t1519x_l;
        u32 t1519x_u;
        u32 res02a8[6];
        u32 tcnp_l;
        u32 tcnp_u;
        u32 res02c8[14];
        /* Line Interface Control */
        u32 if_mode;            /* 0x300 Interface Mode Control */
        u32 if_status;          /* 0x304 Interface Status */
        u32 res0308[14];
        /* HiGig/2 */
        u32 hg_config;          /* 0x340 Control and cfg */
        u32 res0344[3];
        u32 hg_pause_quanta;    /* 0x350 Pause quanta */
        u32 res0354[3];
        u32 hg_pause_thresh;    /* 0x360 Pause quanta threshold */
        u32 res0364[3];
        u32 hgrx_pause_status;  /* 0x370 Receive pause status */
        u32 hg_fifos_status;    /* 0x374 fifos status */
        u32 rhm;                /* 0x378 rx messages counter */
        u32 thm;                /* 0x37C tx messages counter */
};

struct memac_cfg {
        bool reset_on_init;
        bool pause_ignore;
        bool promiscuous_mode_enable;
        struct fixed_phy_status *fixed_link;
        u16 max_frame_length;
        u16 pause_quanta;
        u32 tx_ipg_length;
};

struct fman_mac {
        /* Pointer to MAC memory mapped registers */
        struct memac_regs __iomem *regs;
        /* MAC address of device */
        u64 addr;
        /* Ethernet physical interface */
        phy_interface_t phy_if;
        u16 max_speed;
        void *dev_id; /* device cookie used by the exception cbs */
        fman_mac_exception_cb *exception_cb;
        fman_mac_exception_cb *event_cb;
        /* Pointer to driver's global address hash table  */
        struct eth_hash_t *multicast_addr_hash;
        /* Pointer to driver's individual address hash table  */
        struct eth_hash_t *unicast_addr_hash;
        u8 mac_id;
        u32 exceptions;
        struct memac_cfg *memac_drv_param;
        void *fm;
        struct fman_rev_info fm_rev_info;
        bool basex_if;
        struct phy_device *pcsphy;
        bool allmulti_enabled;
};

static void add_addr_in_paddr(struct memac_regs __iomem *regs, u8 *adr,
                              u8 paddr_num)
{
        u32 tmp0, tmp1;

        tmp0 = (u32)(adr[0] | adr[1] << 8 | adr[2] << 16 | adr[3] << 24);
        tmp1 = (u32)(adr[4] | adr[5] << 8);

        if (paddr_num == 0) {
                iowrite32be(tmp0, &regs->mac_addr0.mac_addr_l);
                iowrite32be(tmp1, &regs->mac_addr0.mac_addr_u);
        } else {
                iowrite32be(tmp0, &regs->mac_addr[paddr_num - 1].mac_addr_l);
                iowrite32be(tmp1, &regs->mac_addr[paddr_num - 1].mac_addr_u);
        }
}

static int reset(struct memac_regs __iomem *regs)
{
        u32 tmp;
        int count;

        tmp = ioread32be(&regs->command_config);

        tmp |= CMD_CFG_SW_RESET;

        iowrite32be(tmp, &regs->command_config);

        count = 100;
        do {
                udelay(1);
        } while ((ioread32be(&regs->command_config) & CMD_CFG_SW_RESET) &&
                 --count);

        if (count == 0)
                return -EBUSY;

        return 0;
}

static void set_exception(struct memac_regs __iomem *regs, u32 val,
                          bool enable)
{
        u32 tmp;

        tmp = ioread32be(&regs->imask);
        if (enable)
                tmp |= val;
        else
                tmp &= ~val;

        iowrite32be(tmp, &regs->imask);
}

static int init(struct memac_regs __iomem *regs, struct memac_cfg *cfg,
                phy_interface_t phy_if, u16 speed, bool slow_10g_if,
                u32 exceptions)
{
        u32 tmp;

        /* Config */
        tmp = 0;
        if (cfg->promiscuous_mode_enable)
                tmp |= CMD_CFG_PROMIS_EN;
        if (cfg->pause_ignore)
                tmp |= CMD_CFG_PAUSE_IGNORE;

        /* Payload length check disable */
        tmp |= CMD_CFG_NO_LEN_CHK;
        /* Enable padding of frames in transmit direction */
        tmp |= CMD_CFG_TX_PAD_EN;

        tmp |= CMD_CFG_CRC_FWD;

        iowrite32be(tmp, &regs->command_config);

        /* Max Frame Length */
        iowrite32be((u32)cfg->max_frame_length, &regs->maxfrm);

        /* Pause Time */
        iowrite32be((u32)cfg->pause_quanta, &regs->pause_quanta[0]);
        iowrite32be((u32)0, &regs->pause_thresh[0]);

        /* IF_MODE */
        tmp = 0;
        switch (phy_if) {
        case PHY_INTERFACE_MODE_XGMII:
                tmp |= IF_MODE_XGMII;
                break;
        default:
                tmp |= IF_MODE_GMII;
                if (phy_if == PHY_INTERFACE_MODE_RGMII ||
                    phy_if == PHY_INTERFACE_MODE_RGMII_ID ||
                    phy_if == PHY_INTERFACE_MODE_RGMII_RXID ||
                    phy_if == PHY_INTERFACE_MODE_RGMII_TXID)
                        tmp |= IF_MODE_RGMII | IF_MODE_RGMII_AUTO;
        }
        iowrite32be(tmp, &regs->if_mode);

        /* TX_FIFO_SECTIONS */
        tmp = 0;
        if (phy_if == PHY_INTERFACE_MODE_XGMII) {
                if (slow_10g_if) {
                        tmp |= (TX_FIFO_SECTIONS_TX_AVAIL_SLOW_10G |
                                TX_FIFO_SECTIONS_TX_EMPTY_DEFAULT_10G);
                } else {
                        tmp |= (TX_FIFO_SECTIONS_TX_AVAIL_10G |
                                TX_FIFO_SECTIONS_TX_EMPTY_DEFAULT_10G);
                }
        } else {
                tmp |= (TX_FIFO_SECTIONS_TX_AVAIL_1G |
                        TX_FIFO_SECTIONS_TX_EMPTY_DEFAULT_1G);
        }
        iowrite32be(tmp, &regs->tx_fifo_sections);

        /* clear all pending events and set-up interrupts */
        iowrite32be(0xffffffff, &regs->ievent);
        set_exception(regs, exceptions, true);

        return 0;
}

static void set_dflts(struct memac_cfg *cfg)
{
        cfg->reset_on_init = false;
        cfg->promiscuous_mode_enable = false;
        cfg->pause_ignore = false;
        cfg->tx_ipg_length = DEFAULT_TX_IPG_LENGTH;
        cfg->max_frame_length = DEFAULT_FRAME_LENGTH;
        cfg->pause_quanta = DEFAULT_PAUSE_QUANTA;
}

static u32 get_mac_addr_hash_code(u64 eth_addr)
{
        u64 mask1, mask2;
        u32 xor_val = 0;
        u8 i, j;

        for (i = 0; i < 6; i++) {
                mask1 = eth_addr & (u64)0x01;
                eth_addr >>= 1;

                for (j = 0; j < 7; j++) {
                        mask2 = eth_addr & (u64)0x01;
                        mask1 ^= mask2;
                        eth_addr >>= 1;
                }

                xor_val |= (mask1 << (5 - i));
        }

        return xor_val;
}

static void setup_sgmii_internal_phy(struct fman_mac *memac,
                                     struct fixed_phy_status *fixed_link)
{
        u16 tmp_reg16;

        if (WARN_ON(!memac->pcsphy))
                return;

        /* SGMII mode */
        tmp_reg16 = IF_MODE_SGMII_EN;
        if (!fixed_link)
                /* AN enable */
                tmp_reg16 |= IF_MODE_USE_SGMII_AN;
        else {
                switch (fixed_link->speed) {
                case 10:
                        /* For 10M: IF_MODE[SPEED_10M] = 0 */
                break;
                case 100:
                        tmp_reg16 |= IF_MODE_SGMII_SPEED_100M;
                break;
                case 1000: /* fallthrough */
                default:
                        tmp_reg16 |= IF_MODE_SGMII_SPEED_1G;
                break;
                }
                if (!fixed_link->duplex)
                        tmp_reg16 |= IF_MODE_SGMII_DUPLEX_HALF;
        }
        phy_write(memac->pcsphy, MDIO_SGMII_IF_MODE, tmp_reg16);

        /* Device ability according to SGMII specification */
        tmp_reg16 = MDIO_SGMII_DEV_ABIL_SGMII_MODE;
        phy_write(memac->pcsphy, MDIO_SGMII_DEV_ABIL_SGMII, tmp_reg16);

        /* Adjust link timer for SGMII  -
         * According to Cisco SGMII specification the timer should be 1.6 ms.
         * The link_timer register is configured in units of the clock.
         * - When running as 1G SGMII, Serdes clock is 125 MHz, so
         * unit = 1 / (125*10^6 Hz) = 8 ns.
         * 1.6 ms in units of 8 ns = 1.6ms / 8ns = 2*10^5 = 0x30d40
         * - When running as 2.5G SGMII, Serdes clock is 312.5 MHz, so
         * unit = 1 / (312.5*10^6 Hz) = 3.2 ns.
         * 1.6 ms in units of 3.2 ns = 1.6ms / 3.2ns = 5*10^5 = 0x7a120.
         * Since link_timer value of 1G SGMII will be too short for 2.5 SGMII,
         * we always set up here a value of 2.5 SGMII.
         */
        phy_write(memac->pcsphy, MDIO_SGMII_LINK_TMR_H, LINK_TMR_H);
        phy_write(memac->pcsphy, MDIO_SGMII_LINK_TMR_L, LINK_TMR_L);

        if (!fixed_link)
                /* Restart AN */
                tmp_reg16 = SGMII_CR_DEF_VAL | SGMII_CR_RESTART_AN;
        else
                /* AN disabled */
                tmp_reg16 = SGMII_CR_DEF_VAL & ~SGMII_CR_AN_EN;
        phy_write(memac->pcsphy, 0x0, tmp_reg16);
}

static void setup_sgmii_internal_phy_base_x(struct fman_mac *memac)
{
        u16 tmp_reg16;

        /* AN Device capability  */
        tmp_reg16 = MDIO_SGMII_DEV_ABIL_BASEX_MODE;
        phy_write(memac->pcsphy, MDIO_SGMII_DEV_ABIL_SGMII, tmp_reg16);

        /* Adjust link timer for SGMII  -
         * For Serdes 1000BaseX auto-negotiation the timer should be 10 ms.
         * The link_timer register is configured in units of the clock.
         * - When running as 1G SGMII, Serdes clock is 125 MHz, so
         * unit = 1 / (125*10^6 Hz) = 8 ns.
         * 10 ms in units of 8 ns = 10ms / 8ns = 1250000 = 0x1312d0
         * - When running as 2.5G SGMII, Serdes clock is 312.5 MHz, so
         * unit = 1 / (312.5*10^6 Hz) = 3.2 ns.
         * 10 ms in units of 3.2 ns = 10ms / 3.2ns = 3125000 = 0x2faf08.
         * Since link_timer value of 1G SGMII will be too short for 2.5 SGMII,
         * we always set up here a value of 2.5 SGMII.
         */
        phy_write(memac->pcsphy, MDIO_SGMII_LINK_TMR_H, LINK_TMR_H_BASEX);
        phy_write(memac->pcsphy, MDIO_SGMII_LINK_TMR_L, LINK_TMR_L_BASEX);

        /* Restart AN */
        tmp_reg16 = SGMII_CR_DEF_VAL | SGMII_CR_RESTART_AN;
        phy_write(memac->pcsphy, 0x0, tmp_reg16);
}

static int check_init_parameters(struct fman_mac *memac)
{
        if (memac->addr == 0) {
                pr_err("Ethernet MAC must have a valid MAC address\n");
                return -EINVAL;
        }
        if (!memac->exception_cb) {
                pr_err("Uninitialized exception handler\n");
                return -EINVAL;
        }
        if (!memac->event_cb) {
                pr_warn("Uninitialize event handler\n");
                return -EINVAL;
        }

        return 0;
}

static int get_exception_flag(enum fman_mac_exceptions exception)
{
        u32 bit_mask;

        switch (exception) {
        case FM_MAC_EX_10G_TX_ECC_ER:
                bit_mask = MEMAC_IMASK_TECC_ER;
                break;
        case FM_MAC_EX_10G_RX_ECC_ER:
                bit_mask = MEMAC_IMASK_RECC_ER;
                break;
        case FM_MAC_EX_TS_FIFO_ECC_ERR:
                bit_mask = MEMAC_IMASK_TSECC_ER;
                break;
        case FM_MAC_EX_MAGIC_PACKET_INDICATION:
                bit_mask = MEMAC_IMASK_MGI;
                break;
        default:
                bit_mask = 0;
                break;
        }

        return bit_mask;
}

static void memac_err_exception(void *handle)
{
        struct fman_mac *memac = (struct fman_mac *)handle;
        struct memac_regs __iomem *regs = memac->regs;
        u32 event, imask;

        event = ioread32be(&regs->ievent);
        imask = ioread32be(&regs->imask);

        /* Imask include both error and notification/event bits.
         * Leaving only error bits enabled by imask.
         * The imask error bits are shifted by 16 bits offset from
         * their corresponding location in the ievent - hence the >> 16
         */
        event &= ((imask & MEMAC_ALL_ERRS_IMASK) >> 16);

        iowrite32be(event, &regs->ievent);

        if (event & MEMAC_IEVNT_TS_ECC_ER)
                memac->exception_cb(memac->dev_id, FM_MAC_EX_TS_FIFO_ECC_ERR);
        if (event & MEMAC_IEVNT_TX_ECC_ER)
                memac->exception_cb(memac->dev_id, FM_MAC_EX_10G_TX_ECC_ER);
        if (event & MEMAC_IEVNT_RX_ECC_ER)
                memac->exception_cb(memac->dev_id, FM_MAC_EX_10G_RX_ECC_ER);
}

static void memac_exception(void *handle)
{
        struct fman_mac *memac = (struct fman_mac *)handle;
        struct memac_regs __iomem *regs = memac->regs;
        u32 event, imask;

        event = ioread32be(&regs->ievent);
        imask = ioread32be(&regs->imask);

        /* Imask include both error and notification/event bits.
         * Leaving only error bits enabled by imask.
         * The imask error bits are shifted by 16 bits offset from
         * their corresponding location in the ievent - hence the >> 16
         */
        event &= ((imask & MEMAC_ALL_ERRS_IMASK) >> 16);

        iowrite32be(event, &regs->ievent);

        if (event & MEMAC_IEVNT_MGI)
                memac->exception_cb(memac->dev_id,
                                    FM_MAC_EX_MAGIC_PACKET_INDICATION);
}

static void free_init_resources(struct fman_mac *memac)
{
        fman_unregister_intr(memac->fm, FMAN_MOD_MAC, memac->mac_id,
                             FMAN_INTR_TYPE_ERR);

        fman_unregister_intr(memac->fm, FMAN_MOD_MAC, memac->mac_id,
                             FMAN_INTR_TYPE_NORMAL);

        /* release the driver's group hash table */
        free_hash_table(memac->multicast_addr_hash);
        memac->multicast_addr_hash = NULL;

        /* release the driver's individual hash table */
        free_hash_table(memac->unicast_addr_hash);
        memac->unicast_addr_hash = NULL;
}

static bool is_init_done(struct memac_cfg *memac_drv_params)
{
        /* Checks if mEMAC driver parameters were initialized */
        if (!memac_drv_params)
                return true;

        return false;
}

int memac_enable(struct fman_mac *memac, enum comm_mode mode)
{
        struct memac_regs __iomem *regs = memac->regs;
        u32 tmp;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        tmp = ioread32be(&regs->command_config);
        if (mode & COMM_MODE_RX)
                tmp |= CMD_CFG_RX_EN;
        if (mode & COMM_MODE_TX)
                tmp |= CMD_CFG_TX_EN;

        iowrite32be(tmp, &regs->command_config);

        return 0;
}

int memac_disable(struct fman_mac *memac, enum comm_mode mode)
{
        struct memac_regs __iomem *regs = memac->regs;
        u32 tmp;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        tmp = ioread32be(&regs->command_config);
        if (mode & COMM_MODE_RX)
                tmp &= ~CMD_CFG_RX_EN;
        if (mode & COMM_MODE_TX)
                tmp &= ~CMD_CFG_TX_EN;

        iowrite32be(tmp, &regs->command_config);

        return 0;
}

int memac_set_promiscuous(struct fman_mac *memac, bool new_val)
{
        struct memac_regs __iomem *regs = memac->regs;
        u32 tmp;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        tmp = ioread32be(&regs->command_config);
        if (new_val)
                tmp |= CMD_CFG_PROMIS_EN;
        else
                tmp &= ~CMD_CFG_PROMIS_EN;

        iowrite32be(tmp, &regs->command_config);

        return 0;
}

int memac_adjust_link(struct fman_mac *memac, u16 speed)
{
        struct memac_regs __iomem *regs = memac->regs;
        u32 tmp;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        tmp = ioread32be(&regs->if_mode);

        /* Set full duplex */
        tmp &= ~IF_MODE_HD;

        if (memac->phy_if == PHY_INTERFACE_MODE_RGMII) {
                /* Configure RGMII in manual mode */
                tmp &= ~IF_MODE_RGMII_AUTO;
                tmp &= ~IF_MODE_RGMII_SP_MASK;
                /* Full duplex */
                tmp |= IF_MODE_RGMII_FD;

                switch (speed) {
                case SPEED_1000:
                        tmp |= IF_MODE_RGMII_1000;
                        break;
                case SPEED_100:
                        tmp |= IF_MODE_RGMII_100;
                        break;
                case SPEED_10:
                        tmp |= IF_MODE_RGMII_10;
                        break;
                default:
                        break;
                }
        }

        iowrite32be(tmp, &regs->if_mode);

        return 0;
}

int memac_cfg_max_frame_len(struct fman_mac *memac, u16 new_val)
{
        if (is_init_done(memac->memac_drv_param))
                return -EINVAL;

        memac->memac_drv_param->max_frame_length = new_val;

        return 0;
}

int memac_cfg_reset_on_init(struct fman_mac *memac, bool enable)
{
        if (is_init_done(memac->memac_drv_param))
                return -EINVAL;

        memac->memac_drv_param->reset_on_init = enable;

        return 0;
}

int memac_cfg_fixed_link(struct fman_mac *memac,
                         struct fixed_phy_status *fixed_link)
{
        if (is_init_done(memac->memac_drv_param))
                return -EINVAL;

        memac->memac_drv_param->fixed_link = fixed_link;

        return 0;
}

int memac_set_tx_pause_frames(struct fman_mac *memac, u8 priority,
                              u16 pause_time, u16 thresh_time)
{
        struct memac_regs __iomem *regs = memac->regs;
        u32 tmp;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        tmp = ioread32be(&regs->tx_fifo_sections);

        GET_TX_EMPTY_DEFAULT_VALUE(tmp);
        iowrite32be(tmp, &regs->tx_fifo_sections);

        tmp = ioread32be(&regs->command_config);
        tmp &= ~CMD_CFG_PFC_MODE;
        priority = 0;

        iowrite32be(tmp, &regs->command_config);

        tmp = ioread32be(&regs->pause_quanta[priority / 2]);
        if (priority % 2)
                tmp &= CLXY_PAUSE_QUANTA_CLX_PQNT;
        else
                tmp &= CLXY_PAUSE_QUANTA_CLY_PQNT;
        tmp |= ((u32)pause_time << (16 * (priority % 2)));
        iowrite32be(tmp, &regs->pause_quanta[priority / 2]);

        tmp = ioread32be(&regs->pause_thresh[priority / 2]);
        if (priority % 2)
                tmp &= CLXY_PAUSE_THRESH_CLX_QTH;
        else
                tmp &= CLXY_PAUSE_THRESH_CLY_QTH;
        tmp |= ((u32)thresh_time << (16 * (priority % 2)));
        iowrite32be(tmp, &regs->pause_thresh[priority / 2]);

        return 0;
}

int memac_accept_rx_pause_frames(struct fman_mac *memac, bool en)
{
        struct memac_regs __iomem *regs = memac->regs;
        u32 tmp;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        tmp = ioread32be(&regs->command_config);
        if (en)
                tmp &= ~CMD_CFG_PAUSE_IGNORE;
        else
                tmp |= CMD_CFG_PAUSE_IGNORE;

        iowrite32be(tmp, &regs->command_config);

        return 0;
}

int memac_modify_mac_address(struct fman_mac *memac, enet_addr_t *enet_addr)
{
        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        add_addr_in_paddr(memac->regs, (u8 *)(*enet_addr), 0);

        return 0;
}

int memac_add_hash_mac_address(struct fman_mac *memac, enet_addr_t *eth_addr)
{
        struct memac_regs __iomem *regs = memac->regs;
        struct eth_hash_entry *hash_entry;
        u32 hash;
        u64 addr;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        addr = ENET_ADDR_TO_UINT64(*eth_addr);

        if (!(addr & GROUP_ADDRESS)) {
                /* Unicast addresses not supported in hash */
                pr_err("Unicast Address\n");
                return -EINVAL;
        }
        hash = get_mac_addr_hash_code(addr) & HASH_CTRL_ADDR_MASK;

        /* Create element to be added to the driver hash table */
        hash_entry = kmalloc(sizeof(*hash_entry), GFP_ATOMIC);
        if (!hash_entry)
                return -ENOMEM;
        hash_entry->addr = addr;
        INIT_LIST_HEAD(&hash_entry->node);

        list_add_tail(&hash_entry->node,
                      &memac->multicast_addr_hash->lsts[hash]);
        iowrite32be(hash | HASH_CTRL_MCAST_EN, &regs->hashtable_ctrl);

        return 0;
}

int memac_set_allmulti(struct fman_mac *memac, bool enable)
{
        u32 entry;
        struct memac_regs __iomem *regs = memac->regs;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        if (enable) {
                for (entry = 0; entry < HASH_TABLE_SIZE; entry++)
                        iowrite32be(entry | HASH_CTRL_MCAST_EN,
                                    &regs->hashtable_ctrl);
        } else {
                for (entry = 0; entry < HASH_TABLE_SIZE; entry++)
                        iowrite32be(entry & ~HASH_CTRL_MCAST_EN,
                                    &regs->hashtable_ctrl);
        }

        memac->allmulti_enabled = enable;

        return 0;
}

int memac_set_tstamp(struct fman_mac *memac, bool enable)
{
        return 0; /* Always enabled. */
}

int memac_del_hash_mac_address(struct fman_mac *memac, enet_addr_t *eth_addr)
{
        struct memac_regs __iomem *regs = memac->regs;
        struct eth_hash_entry *hash_entry = NULL;
        struct list_head *pos;
        u32 hash;
        u64 addr;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        addr = ENET_ADDR_TO_UINT64(*eth_addr);

        hash = get_mac_addr_hash_code(addr) & HASH_CTRL_ADDR_MASK;

        list_for_each(pos, &memac->multicast_addr_hash->lsts[hash]) {
                hash_entry = ETH_HASH_ENTRY_OBJ(pos);
                if (hash_entry->addr == addr) {
                        list_del_init(&hash_entry->node);
                        kfree(hash_entry);
                        break;
                }
        }

        if (!memac->allmulti_enabled) {
                if (list_empty(&memac->multicast_addr_hash->lsts[hash]))
                        iowrite32be(hash & ~HASH_CTRL_MCAST_EN,
                                    &regs->hashtable_ctrl);
        }

        return 0;
}

int memac_set_exception(struct fman_mac *memac,
                        enum fman_mac_exceptions exception, bool enable)
{
        u32 bit_mask = 0;

        if (!is_init_done(memac->memac_drv_param))
                return -EINVAL;

        bit_mask = get_exception_flag(exception);
        if (bit_mask) {
                if (enable)
                        memac->exceptions |= bit_mask;
                else
                        memac->exceptions &= ~bit_mask;
        } else {
                pr_err("Undefined exception\n");
                return -EINVAL;
        }
        set_exception(memac->regs, bit_mask, enable);

        return 0;
}

int memac_init(struct fman_mac *memac)
{
        struct memac_cfg *memac_drv_param;
        u8 i;
        enet_addr_t eth_addr;
        bool slow_10g_if = false;
        struct fixed_phy_status *fixed_link;
        int err;
        u32 reg32 = 0;

        if (is_init_done(memac->memac_drv_param))
                return -EINVAL;

        err = check_init_parameters(memac);
        if (err)
                return err;

        memac_drv_param = memac->memac_drv_param;

        if (memac->fm_rev_info.major == 6 && memac->fm_rev_info.minor == 4)
                slow_10g_if = true;

        /* First, reset the MAC if desired. */
        if (memac_drv_param->reset_on_init) {
                err = reset(memac->regs);
                if (err) {
                        pr_err("mEMAC reset failed\n");
                        return err;
                }
        }

        /* MAC Address */
        MAKE_ENET_ADDR_FROM_UINT64(memac->addr, eth_addr);
        add_addr_in_paddr(memac->regs, (u8 *)eth_addr, 0);

        fixed_link = memac_drv_param->fixed_link;

        init(memac->regs, memac->memac_drv_param, memac->phy_if,
             memac->max_speed, slow_10g_if, memac->exceptions);

        /* FM_RX_FIFO_CORRUPT_ERRATA_10GMAC_A006320 errata workaround
         * Exists only in FMan 6.0 and 6.3.
         */
        if ((memac->fm_rev_info.major == 6) &&
            ((memac->fm_rev_info.minor == 0) ||
            (memac->fm_rev_info.minor == 3))) {
                /* MAC strips CRC from received frames - this workaround
                 * should decrease the likelihood of bug appearance
                 */
                reg32 = ioread32be(&memac->regs->command_config);
                reg32 &= ~CMD_CFG_CRC_FWD;
                iowrite32be(reg32, &memac->regs->command_config);
        }

        if (memac->phy_if == PHY_INTERFACE_MODE_SGMII) {
                /* Configure internal SGMII PHY */
                if (memac->basex_if)
                        setup_sgmii_internal_phy_base_x(memac);
                else
                        setup_sgmii_internal_phy(memac, fixed_link);
        } else if (memac->phy_if == PHY_INTERFACE_MODE_QSGMII) {
                /* Configure 4 internal SGMII PHYs */
                for (i = 0; i < 4; i++) {
                        u8 qsmgii_phy_addr, phy_addr;
                        /* QSGMII PHY address occupies 3 upper bits of 5-bit
                         * phy_address; the lower 2 bits are used to extend
                         * register address space and access each one of 4
                         * ports inside QSGMII.
                         */
                        phy_addr = memac->pcsphy->mdio.addr;
                        qsmgii_phy_addr = (u8)((phy_addr << 2) | i);
                        memac->pcsphy->mdio.addr = qsmgii_phy_addr;
                        if (memac->basex_if)
                                setup_sgmii_internal_phy_base_x(memac);
                        else
                                setup_sgmii_internal_phy(memac, fixed_link);

                        memac->pcsphy->mdio.addr = phy_addr;
                }
        }

        /* Max Frame Length */
        err = fman_set_mac_max_frame(memac->fm, memac->mac_id,
                                     memac_drv_param->max_frame_length);
        if (err) {
                pr_err("settings Mac max frame length is FAILED\n");
                return err;
        }

        memac->multicast_addr_hash = alloc_hash_table(HASH_TABLE_SIZE);
        if (!memac->multicast_addr_hash) {
                free_init_resources(memac);
                pr_err("allocation hash table is FAILED\n");
                return -ENOMEM;
        }

        memac->unicast_addr_hash = alloc_hash_table(HASH_TABLE_SIZE);
        if (!memac->unicast_addr_hash) {
                free_init_resources(memac);
                pr_err("allocation hash table is FAILED\n");
                return -ENOMEM;
        }

        fman_register_intr(memac->fm, FMAN_MOD_MAC, memac->mac_id,
                           FMAN_INTR_TYPE_ERR, memac_err_exception, memac);

        fman_register_intr(memac->fm, FMAN_MOD_MAC, memac->mac_id,
                           FMAN_INTR_TYPE_NORMAL, memac_exception, memac);

        kfree(memac_drv_param);
        memac->memac_drv_param = NULL;

        return 0;
}

int memac_free(struct fman_mac *memac)
{
        free_init_resources(memac);

        if (memac->pcsphy)
                put_device(&memac->pcsphy->mdio.dev);

        kfree(memac->memac_drv_param);
        kfree(memac);

        return 0;
}

struct fman_mac *memac_config(struct fman_mac_params *params)
{
        struct fman_mac *memac;
        struct memac_cfg *memac_drv_param;
        void __iomem *base_addr;

        base_addr = params->base_addr;
        /* allocate memory for the m_emac data structure */
        memac = kzalloc(sizeof(*memac), GFP_KERNEL);
        if (!memac)
                return NULL;

        /* allocate memory for the m_emac driver parameters data structure */
        memac_drv_param = kzalloc(sizeof(*memac_drv_param), GFP_KERNEL);
        if (!memac_drv_param) {
                memac_free(memac);
                return NULL;
        }

        /* Plant parameter structure pointer */
        memac->memac_drv_param = memac_drv_param;

        set_dflts(memac_drv_param);

        memac->addr = ENET_ADDR_TO_UINT64(params->addr);

        memac->regs = base_addr;
        memac->max_speed = params->max_speed;
        memac->phy_if = params->phy_if;
        memac->mac_id = params->mac_id;
        memac->exceptions = (MEMAC_IMASK_TSECC_ER | MEMAC_IMASK_TECC_ER |
                             MEMAC_IMASK_RECC_ER | MEMAC_IMASK_MGI);
        memac->exception_cb = params->exception_cb;
        memac->event_cb = params->event_cb;
        memac->dev_id = params->dev_id;
        memac->fm = params->fm;
        memac->basex_if = params->basex_if;

        /* Save FMan revision */
        fman_get_revision(memac->fm, &memac->fm_rev_info);

        if (memac->phy_if == PHY_INTERFACE_MODE_SGMII ||
            memac->phy_if == PHY_INTERFACE_MODE_QSGMII) {
                if (!params->internal_phy_node) {
                        pr_err("PCS PHY node is not available\n");
                        memac_free(memac);
                        return NULL;
                }

                memac->pcsphy = of_phy_find_device(params->internal_phy_node);
                if (!memac->pcsphy) {
                        pr_err("of_phy_find_device (PCS PHY) failed\n");
                        memac_free(memac);
                        return NULL;
                }
        }

        return memac;
}