/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2005-2006 Fen Systems Ltd.
 * Copyright 2006-2013 Solarflare Communications Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation, incorporated herein by reference.
 */

#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/i2c.h>
#include <linux/mii.h>
#include <linux/slab.h>
#include "net_driver.h"
#include "bitfield.h"
#include "efx.h"
#include "nic.h"
#include "farch_regs.h"
#include "io.h"
#include "phy.h"
#include "workarounds.h"
#include "selftest.h"
#include "mdio_10g.h"

/* Hardware control for SFC4000 (aka Falcon). */

/**************************************************************************
 *
 * NIC stats
 *
 **************************************************************************
 */

#define FALCON_MAC_STATS_SIZE 0x100

#define XgRxOctets_offset 0x0
#define XgRxOctets_WIDTH 48
#define XgRxOctetsOK_offset 0x8
#define XgRxOctetsOK_WIDTH 48
#define XgRxPkts_offset 0x10
#define XgRxPkts_WIDTH 32
#define XgRxPktsOK_offset 0x14
#define XgRxPktsOK_WIDTH 32
#define XgRxBroadcastPkts_offset 0x18
#define XgRxBroadcastPkts_WIDTH 32
#define XgRxMulticastPkts_offset 0x1C
#define XgRxMulticastPkts_WIDTH 32
#define XgRxUnicastPkts_offset 0x20
#define XgRxUnicastPkts_WIDTH 32
#define XgRxUndersizePkts_offset 0x24
#define XgRxUndersizePkts_WIDTH 32
#define XgRxOversizePkts_offset 0x28
#define XgRxOversizePkts_WIDTH 32
#define XgRxJabberPkts_offset 0x2C
#define XgRxJabberPkts_WIDTH 32
#define XgRxUndersizeFCSerrorPkts_offset 0x30
#define XgRxUndersizeFCSerrorPkts_WIDTH 32
#define XgRxDropEvents_offset 0x34
#define XgRxDropEvents_WIDTH 32
#define XgRxFCSerrorPkts_offset 0x38
#define XgRxFCSerrorPkts_WIDTH 32
#define XgRxAlignError_offset 0x3C
#define XgRxAlignError_WIDTH 32
#define XgRxSymbolError_offset 0x40
#define XgRxSymbolError_WIDTH 32
#define XgRxInternalMACError_offset 0x44
#define XgRxInternalMACError_WIDTH 32
#define XgRxControlPkts_offset 0x48
#define XgRxControlPkts_WIDTH 32
#define XgRxPausePkts_offset 0x4C
#define XgRxPausePkts_WIDTH 32
#define XgRxPkts64Octets_offset 0x50
#define XgRxPkts64Octets_WIDTH 32
#define XgRxPkts65to127Octets_offset 0x54
#define XgRxPkts65to127Octets_WIDTH 32
#define XgRxPkts128to255Octets_offset 0x58
#define XgRxPkts128to255Octets_WIDTH 32
#define XgRxPkts256to511Octets_offset 0x5C
#define XgRxPkts256to511Octets_WIDTH 32
#define XgRxPkts512to1023Octets_offset 0x60
#define XgRxPkts512to1023Octets_WIDTH 32
#define XgRxPkts1024to15xxOctets_offset 0x64
#define XgRxPkts1024to15xxOctets_WIDTH 32
#define XgRxPkts15xxtoMaxOctets_offset 0x68
#define XgRxPkts15xxtoMaxOctets_WIDTH 32
#define XgRxLengthError_offset 0x6C
#define XgRxLengthError_WIDTH 32
#define XgTxPkts_offset 0x80
#define XgTxPkts_WIDTH 32
#define XgTxOctets_offset 0x88
#define XgTxOctets_WIDTH 48
#define XgTxMulticastPkts_offset 0x90
#define XgTxMulticastPkts_WIDTH 32
#define XgTxBroadcastPkts_offset 0x94
#define XgTxBroadcastPkts_WIDTH 32
#define XgTxUnicastPkts_offset 0x98
#define XgTxUnicastPkts_WIDTH 32
#define XgTxControlPkts_offset 0x9C
#define XgTxControlPkts_WIDTH 32
#define XgTxPausePkts_offset 0xA0
#define XgTxPausePkts_WIDTH 32
#define XgTxPkts64Octets_offset 0xA4
#define XgTxPkts64Octets_WIDTH 32
#define XgTxPkts65to127Octets_offset 0xA8
#define XgTxPkts65to127Octets_WIDTH 32
#define XgTxPkts128to255Octets_offset 0xAC
#define XgTxPkts128to255Octets_WIDTH 32
#define XgTxPkts256to511Octets_offset 0xB0
#define XgTxPkts256to511Octets_WIDTH 32
#define XgTxPkts512to1023Octets_offset 0xB4
#define XgTxPkts512to1023Octets_WIDTH 32
#define XgTxPkts1024to15xxOctets_offset 0xB8
#define XgTxPkts1024to15xxOctets_WIDTH 32
#define XgTxPkts1519toMaxOctets_offset 0xBC
#define XgTxPkts1519toMaxOctets_WIDTH 32
#define XgTxUndersizePkts_offset 0xC0
#define XgTxUndersizePkts_WIDTH 32
#define XgTxOversizePkts_offset 0xC4
#define XgTxOversizePkts_WIDTH 32
#define XgTxNonTcpUdpPkt_offset 0xC8
#define XgTxNonTcpUdpPkt_WIDTH 16
#define XgTxMacSrcErrPkt_offset 0xCC
#define XgTxMacSrcErrPkt_WIDTH 16
#define XgTxIpSrcErrPkt_offset 0xD0
#define XgTxIpSrcErrPkt_WIDTH 16
#define XgDmaDone_offset 0xD4
#define XgDmaDone_WIDTH 32

#define FALCON_XMAC_STATS_DMA_FLAG(efx)                         \
        (*(u32 *)((efx)->stats_buffer.addr + XgDmaDone_offset))

#define FALCON_DMA_STAT(ext_name, hw_name)                              \
        [FALCON_STAT_ ## ext_name] =                                    \
        { #ext_name,                                                    \
          /* 48-bit stats are zero-padded to 64 on DMA */               \
          hw_name ## _ ## WIDTH == 48 ? 64 : hw_name ## _ ## WIDTH,     \
          hw_name ## _ ## offset }
#define FALCON_OTHER_STAT(ext_name)                                     \
        [FALCON_STAT_ ## ext_name] = { #ext_name, 0, 0 }
#define GENERIC_SW_STAT(ext_name)                               \
        [GENERIC_STAT_ ## ext_name] = { #ext_name, 0, 0 }

static const struct efx_hw_stat_desc falcon_stat_desc[FALCON_STAT_COUNT] = {
        FALCON_DMA_STAT(tx_bytes, XgTxOctets),
        FALCON_DMA_STAT(tx_packets, XgTxPkts),
        FALCON_DMA_STAT(tx_pause, XgTxPausePkts),
        FALCON_DMA_STAT(tx_control, XgTxControlPkts),
        FALCON_DMA_STAT(tx_unicast, XgTxUnicastPkts),
        FALCON_DMA_STAT(tx_multicast, XgTxMulticastPkts),
        FALCON_DMA_STAT(tx_broadcast, XgTxBroadcastPkts),
        FALCON_DMA_STAT(tx_lt64, XgTxUndersizePkts),
        FALCON_DMA_STAT(tx_64, XgTxPkts64Octets),
        FALCON_DMA_STAT(tx_65_to_127, XgTxPkts65to127Octets),
        FALCON_DMA_STAT(tx_128_to_255, XgTxPkts128to255Octets),
        FALCON_DMA_STAT(tx_256_to_511, XgTxPkts256to511Octets),
        FALCON_DMA_STAT(tx_512_to_1023, XgTxPkts512to1023Octets),
        FALCON_DMA_STAT(tx_1024_to_15xx, XgTxPkts1024to15xxOctets),
        FALCON_DMA_STAT(tx_15xx_to_jumbo, XgTxPkts1519toMaxOctets),
        FALCON_DMA_STAT(tx_gtjumbo, XgTxOversizePkts),
        FALCON_DMA_STAT(tx_non_tcpudp, XgTxNonTcpUdpPkt),
        FALCON_DMA_STAT(tx_mac_src_error, XgTxMacSrcErrPkt),
        FALCON_DMA_STAT(tx_ip_src_error, XgTxIpSrcErrPkt),
        FALCON_DMA_STAT(rx_bytes, XgRxOctets),
        FALCON_DMA_STAT(rx_good_bytes, XgRxOctetsOK),
        FALCON_OTHER_STAT(rx_bad_bytes),
        FALCON_DMA_STAT(rx_packets, XgRxPkts),
        FALCON_DMA_STAT(rx_good, XgRxPktsOK),
        FALCON_DMA_STAT(rx_bad, XgRxFCSerrorPkts),
        FALCON_DMA_STAT(rx_pause, XgRxPausePkts),
        FALCON_DMA_STAT(rx_control, XgRxControlPkts),
        FALCON_DMA_STAT(rx_unicast, XgRxUnicastPkts),
        FALCON_DMA_STAT(rx_multicast, XgRxMulticastPkts),
        FALCON_DMA_STAT(rx_broadcast, XgRxBroadcastPkts),
        FALCON_DMA_STAT(rx_lt64, XgRxUndersizePkts),
        FALCON_DMA_STAT(rx_64, XgRxPkts64Octets),
        FALCON_DMA_STAT(rx_65_to_127, XgRxPkts65to127Octets),
        FALCON_DMA_STAT(rx_128_to_255, XgRxPkts128to255Octets),
        FALCON_DMA_STAT(rx_256_to_511, XgRxPkts256to511Octets),
        FALCON_DMA_STAT(rx_512_to_1023, XgRxPkts512to1023Octets),
        FALCON_DMA_STAT(rx_1024_to_15xx, XgRxPkts1024to15xxOctets),
        FALCON_DMA_STAT(rx_15xx_to_jumbo, XgRxPkts15xxtoMaxOctets),
        FALCON_DMA_STAT(rx_gtjumbo, XgRxOversizePkts),
        FALCON_DMA_STAT(rx_bad_lt64, XgRxUndersizeFCSerrorPkts),
        FALCON_DMA_STAT(rx_bad_gtjumbo, XgRxJabberPkts),
        FALCON_DMA_STAT(rx_overflow, XgRxDropEvents),
        FALCON_DMA_STAT(rx_symbol_error, XgRxSymbolError),
        FALCON_DMA_STAT(rx_align_error, XgRxAlignError),
        FALCON_DMA_STAT(rx_length_error, XgRxLengthError),
        FALCON_DMA_STAT(rx_internal_error, XgRxInternalMACError),
        FALCON_OTHER_STAT(rx_nodesc_drop_cnt),
        GENERIC_SW_STAT(rx_nodesc_trunc),
        GENERIC_SW_STAT(rx_noskb_drops),
};
static const unsigned long falcon_stat_mask[] = {
        [0 ... BITS_TO_LONGS(FALCON_STAT_COUNT) - 1] = ~0UL,
};

/**************************************************************************
 *
 * Basic SPI command set and bit definitions
 *
 *************************************************************************/

#define SPI_WRSR 0x01           /* Write status register */
#define SPI_WRITE 0x02          /* Write data to memory array */
#define SPI_READ 0x03           /* Read data from memory array */
#define SPI_WRDI 0x04           /* Reset write enable latch */
#define SPI_RDSR 0x05           /* Read status register */
#define SPI_WREN 0x06           /* Set write enable latch */
#define SPI_SST_EWSR 0x50       /* SST: Enable write to status register */

#define SPI_STATUS_WPEN 0x80    /* Write-protect pin enabled */
#define SPI_STATUS_BP2 0x10     /* Block protection bit 2 */
#define SPI_STATUS_BP1 0x08     /* Block protection bit 1 */
#define SPI_STATUS_BP0 0x04     /* Block protection bit 0 */
#define SPI_STATUS_WEN 0x02     /* State of the write enable latch */
#define SPI_STATUS_NRDY 0x01    /* Device busy flag */

/**************************************************************************
 *
 * Non-volatile memory layout
 *
 **************************************************************************
 */

/* SFC4000 flash is partitioned into:
 *     0-0x400       chip and board config (see struct falcon_nvconfig)
 *     0x400-0x8000  unused (or may contain VPD if EEPROM not present)
 *     0x8000-end    boot code (mapped to PCI expansion ROM)
 * SFC4000 small EEPROM (size < 0x400) is used for VPD only.
 * SFC4000 large EEPROM (size >= 0x400) is partitioned into:
 *     0-0x400       chip and board config
 *     configurable  VPD
 *     0x800-0x1800  boot config
 * Aside from the chip and board config, all of these are optional and may
 * be absent or truncated depending on the devices used.
 */
#define FALCON_NVCONFIG_END 0x400U
#define FALCON_FLASH_BOOTCODE_START 0x8000U
#define FALCON_EEPROM_BOOTCONFIG_START 0x800U
#define FALCON_EEPROM_BOOTCONFIG_END 0x1800U

/* Board configuration v2 (v1 is obsolete; later versions are compatible) */
struct falcon_nvconfig_board_v2 {
        __le16 nports;
        u8 port0_phy_addr;
        u8 port0_phy_type;
        u8 port1_phy_addr;
        u8 port1_phy_type;
        __le16 asic_sub_revision;
        __le16 board_revision;
} __packed;

/* Board configuration v3 extra information */
struct falcon_nvconfig_board_v3 {
        __le32 spi_device_type[2];
} __packed;

/* Bit numbers for spi_device_type */
#define SPI_DEV_TYPE_SIZE_LBN 0
#define SPI_DEV_TYPE_SIZE_WIDTH 5
#define SPI_DEV_TYPE_ADDR_LEN_LBN 6
#define SPI_DEV_TYPE_ADDR_LEN_WIDTH 2
#define SPI_DEV_TYPE_ERASE_CMD_LBN 8
#define SPI_DEV_TYPE_ERASE_CMD_WIDTH 8
#define SPI_DEV_TYPE_ERASE_SIZE_LBN 16
#define SPI_DEV_TYPE_ERASE_SIZE_WIDTH 5
#define SPI_DEV_TYPE_BLOCK_SIZE_LBN 24
#define SPI_DEV_TYPE_BLOCK_SIZE_WIDTH 5
#define SPI_DEV_TYPE_FIELD(type, field)                                 \
        (((type) >> EFX_LOW_BIT(field)) & EFX_MASK32(EFX_WIDTH(field)))

#define FALCON_NVCONFIG_OFFSET 0x300

#define FALCON_NVCONFIG_BOARD_MAGIC_NUM 0xFA1C
struct falcon_nvconfig {
        efx_oword_t ee_vpd_cfg_reg;                     /* 0x300 */
        u8 mac_address[2][8];                   /* 0x310 */
        efx_oword_t pcie_sd_ctl0123_reg;                /* 0x320 */
        efx_oword_t pcie_sd_ctl45_reg;                  /* 0x330 */
        efx_oword_t pcie_pcs_ctl_stat_reg;              /* 0x340 */
        efx_oword_t hw_init_reg;                        /* 0x350 */
        efx_oword_t nic_stat_reg;                       /* 0x360 */
        efx_oword_t glb_ctl_reg;                        /* 0x370 */
        efx_oword_t srm_cfg_reg;                        /* 0x380 */
        efx_oword_t spare_reg;                          /* 0x390 */
        __le16 board_magic_num;                 /* 0x3A0 */
        __le16 board_struct_ver;
        __le16 board_checksum;
        struct falcon_nvconfig_board_v2 board_v2;
        efx_oword_t ee_base_page_reg;                   /* 0x3B0 */
        struct falcon_nvconfig_board_v3 board_v3;       /* 0x3C0 */
} __packed;

/*************************************************************************/

static int falcon_reset_hw(struct efx_nic *efx, enum reset_type method);
static void falcon_reconfigure_mac_wrapper(struct efx_nic *efx);

static const unsigned int
/* "Large" EEPROM device: Atmel AT25640 or similar
 * 8 KB, 16-bit address, 32 B write block */
large_eeprom_type = ((13 << SPI_DEV_TYPE_SIZE_LBN)
                     | (2 << SPI_DEV_TYPE_ADDR_LEN_LBN)
                     | (5 << SPI_DEV_TYPE_BLOCK_SIZE_LBN)),
/* Default flash device: Atmel AT25F1024
 * 128 KB, 24-bit address, 32 KB erase block, 256 B write block */
default_flash_type = ((17 << SPI_DEV_TYPE_SIZE_LBN)
                      | (3 << SPI_DEV_TYPE_ADDR_LEN_LBN)
                      | (0x52 << SPI_DEV_TYPE_ERASE_CMD_LBN)
                      | (15 << SPI_DEV_TYPE_ERASE_SIZE_LBN)
                      | (8 << SPI_DEV_TYPE_BLOCK_SIZE_LBN));

/**************************************************************************
 *
 * I2C bus - this is a bit-bashing interface using GPIO pins
 * Note that it uses the output enables to tristate the outputs
 * SDA is the data pin and SCL is the clock
 *
 **************************************************************************
 */
static void falcon_setsda(void *data, int state)
{
        struct efx_nic *efx = (struct efx_nic *)data;
        efx_oword_t reg;

        efx_reado(efx, &reg, FR_AB_GPIO_CTL);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_GPIO3_OEN, !state);
        efx_writeo(efx, &reg, FR_AB_GPIO_CTL);
}

static void falcon_setscl(void *data, int state)
{
        struct efx_nic *efx = (struct efx_nic *)data;
        efx_oword_t reg;

        efx_reado(efx, &reg, FR_AB_GPIO_CTL);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_GPIO0_OEN, !state);
        efx_writeo(efx, &reg, FR_AB_GPIO_CTL);
}

static int falcon_getsda(void *data)
{
        struct efx_nic *efx = (struct efx_nic *)data;
        efx_oword_t reg;

        efx_reado(efx, &reg, FR_AB_GPIO_CTL);
        return EFX_OWORD_FIELD(reg, FRF_AB_GPIO3_IN);
}

static int falcon_getscl(void *data)
{
        struct efx_nic *efx = (struct efx_nic *)data;
        efx_oword_t reg;

        efx_reado(efx, &reg, FR_AB_GPIO_CTL);
        return EFX_OWORD_FIELD(reg, FRF_AB_GPIO0_IN);
}

static const struct i2c_algo_bit_data falcon_i2c_bit_operations = {
        .setsda         = falcon_setsda,
        .setscl         = falcon_setscl,
        .getsda         = falcon_getsda,
        .getscl         = falcon_getscl,
        .udelay         = 5,
        /* Wait up to 50 ms for slave to let us pull SCL high */
        .timeout        = DIV_ROUND_UP(HZ, 20),
};

static void falcon_push_irq_moderation(struct efx_channel *channel)
{
        efx_dword_t timer_cmd;
        struct efx_nic *efx = channel->efx;

        /* Set timer register */
        if (channel->irq_moderation) {
                EFX_POPULATE_DWORD_2(timer_cmd,
                                     FRF_AB_TC_TIMER_MODE,
                                     FFE_BB_TIMER_MODE_INT_HLDOFF,
                                     FRF_AB_TC_TIMER_VAL,
                                     channel->irq_moderation - 1);
        } else {
                EFX_POPULATE_DWORD_2(timer_cmd,
                                     FRF_AB_TC_TIMER_MODE,
                                     FFE_BB_TIMER_MODE_DIS,
                                     FRF_AB_TC_TIMER_VAL, 0);
        }
        BUILD_BUG_ON(FR_AA_TIMER_COMMAND_KER != FR_BZ_TIMER_COMMAND_P0);
        efx_writed_page_locked(efx, &timer_cmd, FR_BZ_TIMER_COMMAND_P0,
                               channel->channel);
}

static void falcon_deconfigure_mac_wrapper(struct efx_nic *efx);

static void falcon_prepare_flush(struct efx_nic *efx)
{
        falcon_deconfigure_mac_wrapper(efx);

        /* Wait for the tx and rx fifo's to get to the next packet boundary
         * (~1ms without back-pressure), then to drain the remainder of the
         * fifo's at data path speeds (negligible), with a healthy margin. */
        msleep(10);
}

/* Acknowledge a legacy interrupt from Falcon
 *
 * This acknowledges a legacy (not MSI) interrupt via INT_ACK_KER_REG.
 *
 * Due to SFC bug 3706 (silicon revision <=A1) reads can be duplicated in the
 * BIU. Interrupt acknowledge is read sensitive so must write instead
 * (then read to ensure the BIU collector is flushed)
 *
 * NB most hardware supports MSI interrupts
 */
static inline void falcon_irq_ack_a1(struct efx_nic *efx)
{
        efx_dword_t reg;

        EFX_POPULATE_DWORD_1(reg, FRF_AA_INT_ACK_KER_FIELD, 0xb7eb7e);
        efx_writed(efx, &reg, FR_AA_INT_ACK_KER);
        efx_readd(efx, &reg, FR_AA_WORK_AROUND_BROKEN_PCI_READS);
}

static irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id)
{
        struct efx_nic *efx = dev_id;
        efx_oword_t *int_ker = efx->irq_status.addr;
        int syserr;
        int queues;

        /* Check to see if this is our interrupt.  If it isn't, we
         * exit without having touched the hardware.
         */
        if (unlikely(EFX_OWORD_IS_ZERO(*int_ker))) {
                netif_vdbg(efx, intr, efx->net_dev,
                           "IRQ %d on CPU %d not for me\n", irq,
                           raw_smp_processor_id());
                return IRQ_NONE;
        }
        efx->last_irq_cpu = raw_smp_processor_id();
        netif_vdbg(efx, intr, efx->net_dev,
                   "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
                   irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));

        if (!likely(ACCESS_ONCE(efx->irq_soft_enabled)))
                return IRQ_HANDLED;

        /* Check to see if we have a serious error condition */
        syserr = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);
        if (unlikely(syserr))
                return efx_farch_fatal_interrupt(efx);

        /* Determine interrupting queues, clear interrupt status
         * register and acknowledge the device interrupt.
         */
        BUILD_BUG_ON(FSF_AZ_NET_IVEC_INT_Q_WIDTH > EFX_MAX_CHANNELS);
        queues = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_INT_Q);
        EFX_ZERO_OWORD(*int_ker);
        wmb(); /* Ensure the vector is cleared before interrupt ack */
        falcon_irq_ack_a1(efx);

        if (queues & 1)
                efx_schedule_channel_irq(efx_get_channel(efx, 0));
        if (queues & 2)
                efx_schedule_channel_irq(efx_get_channel(efx, 1));
        return IRQ_HANDLED;
}

/**************************************************************************
 *
 * RSS
 *
 **************************************************************************
 */
static int dummy_rx_push_rss_config(struct efx_nic *efx, bool user,
                                    const u32 *rx_indir_table)
{
        (void) efx;
        (void) user;
        (void) rx_indir_table;
        return -ENOSYS;
}

static int falcon_b0_rx_push_rss_config(struct efx_nic *efx, bool user,
                                        const u32 *rx_indir_table)
{
        efx_oword_t temp;

        (void) user;
        /* Set hash key for IPv4 */
        memcpy(&temp, efx->rx_hash_key, sizeof(temp));
        efx_writeo(efx, &temp, FR_BZ_RX_RSS_TKEY);

        memcpy(efx->rx_indir_table, rx_indir_table,
               sizeof(efx->rx_indir_table));
        efx_farch_rx_push_indir_table(efx);
        return 0;
}

/**************************************************************************
 *
 * EEPROM/flash
 *
 **************************************************************************
 */

#define FALCON_SPI_MAX_LEN sizeof(efx_oword_t)

static int falcon_spi_poll(struct efx_nic *efx)
{
        efx_oword_t reg;
        efx_reado(efx, &reg, FR_AB_EE_SPI_HCMD);
        return EFX_OWORD_FIELD(reg, FRF_AB_EE_SPI_HCMD_CMD_EN) ? -EBUSY : 0;
}

/* Wait for SPI command completion */
static int falcon_spi_wait(struct efx_nic *efx)
{
        /* Most commands will finish quickly, so we start polling at
         * very short intervals.  Sometimes the command may have to
         * wait for VPD or expansion ROM access outside of our
         * control, so we allow up to 100 ms. */
        unsigned long timeout = jiffies + 1 + DIV_ROUND_UP(HZ, 10);
        int i;

        for (i = 0; i < 10; i++) {
                if (!falcon_spi_poll(efx))
                        return 0;
                udelay(10);
        }

        for (;;) {
                if (!falcon_spi_poll(efx))
                        return 0;
                if (time_after_eq(jiffies, timeout)) {
                        netif_err(efx, hw, efx->net_dev,
                                  "timed out waiting for SPI\n");
                        return -ETIMEDOUT;
                }
                schedule_timeout_uninterruptible(1);
        }
}

static int
falcon_spi_cmd(struct efx_nic *efx, const struct falcon_spi_device *spi,
               unsigned int command, int address,
               const void *in, void *out, size_t len)
{
        bool addressed = (address >= 0);
        bool reading = (out != NULL);
        efx_oword_t reg;
        int rc;

        /* Input validation */
        if (len > FALCON_SPI_MAX_LEN)
                return -EINVAL;

        /* Check that previous command is not still running */
        rc = falcon_spi_poll(efx);
        if (rc)
                return rc;

        /* Program address register, if we have an address */
        if (addressed) {
                EFX_POPULATE_OWORD_1(reg, FRF_AB_EE_SPI_HADR_ADR, address);
                efx_writeo(efx, &reg, FR_AB_EE_SPI_HADR);
        }

        /* Program data register, if we have data */
        if (in != NULL) {
                memcpy(&reg, in, len);
                efx_writeo(efx, &reg, FR_AB_EE_SPI_HDATA);
        }

        /* Issue read/write command */
        EFX_POPULATE_OWORD_7(reg,
                             FRF_AB_EE_SPI_HCMD_CMD_EN, 1,
                             FRF_AB_EE_SPI_HCMD_SF_SEL, spi->device_id,
                             FRF_AB_EE_SPI_HCMD_DABCNT, len,
                             FRF_AB_EE_SPI_HCMD_READ, reading,
                             FRF_AB_EE_SPI_HCMD_DUBCNT, 0,
                             FRF_AB_EE_SPI_HCMD_ADBCNT,
                             (addressed ? spi->addr_len : 0),
                             FRF_AB_EE_SPI_HCMD_ENC, command);
        efx_writeo(efx, &reg, FR_AB_EE_SPI_HCMD);

        /* Wait for read/write to complete */
        rc = falcon_spi_wait(efx);
        if (rc)
                return rc;

        /* Read data */
        if (out != NULL) {
                efx_reado(efx, &reg, FR_AB_EE_SPI_HDATA);
                memcpy(out, &reg, len);
        }

        return 0;
}

static inline u8
falcon_spi_munge_command(const struct falcon_spi_device *spi,
                         const u8 command, const unsigned int address)
{
        return command | (((address >> 8) & spi->munge_address) << 3);
}

static int
falcon_spi_read(struct efx_nic *efx, const struct falcon_spi_device *spi,
                loff_t start, size_t len, size_t *retlen, u8 *buffer)
{
        size_t block_len, pos = 0;
        unsigned int command;
        int rc = 0;

        while (pos < len) {
                block_len = min(len - pos, FALCON_SPI_MAX_LEN);

                command = falcon_spi_munge_command(spi, SPI_READ, start + pos);
                rc = falcon_spi_cmd(efx, spi, command, start + pos, NULL,
                                    buffer + pos, block_len);
                if (rc)
                        break;
                pos += block_len;

                /* Avoid locking up the system */
                cond_resched();
                if (signal_pending(current)) {
                        rc = -EINTR;
                        break;
                }
        }

        if (retlen)
                *retlen = pos;
        return rc;
}

#ifdef CONFIG_SFC_MTD

struct falcon_mtd_partition {
        struct efx_mtd_partition common;
        const struct falcon_spi_device *spi;
        size_t offset;
};

#define to_falcon_mtd_partition(mtd)                            \
        container_of(mtd, struct falcon_mtd_partition, common.mtd)

static size_t
falcon_spi_write_limit(const struct falcon_spi_device *spi, size_t start)
{
        return min(FALCON_SPI_MAX_LEN,
                   (spi->block_size - (start & (spi->block_size - 1))));
}

/* Wait up to 10 ms for buffered write completion */
static int
falcon_spi_wait_write(struct efx_nic *efx, const struct falcon_spi_device *spi)
{
        unsigned long timeout = jiffies + 1 + DIV_ROUND_UP(HZ, 100);
        u8 status;
        int rc;

        for (;;) {
                rc = falcon_spi_cmd(efx, spi, SPI_RDSR, -1, NULL,
                                    &status, sizeof(status));
                if (rc)
                        return rc;
                if (!(status & SPI_STATUS_NRDY))
                        return 0;
                if (time_after_eq(jiffies, timeout)) {
                        netif_err(efx, hw, efx->net_dev,
                                  "SPI write timeout on device %d"
                                  " last status=0x%02x\n",
                                  spi->device_id, status);
                        return -ETIMEDOUT;
                }
                schedule_timeout_uninterruptible(1);
        }
}

static int
falcon_spi_write(struct efx_nic *efx, const struct falcon_spi_device *spi,
                 loff_t start, size_t len, size_t *retlen, const u8 *buffer)
{
        u8 verify_buffer[FALCON_SPI_MAX_LEN];
        size_t block_len, pos = 0;
        unsigned int command;
        int rc = 0;

        while (pos < len) {
                rc = falcon_spi_cmd(efx, spi, SPI_WREN, -1, NULL, NULL, 0);
                if (rc)
                        break;

                block_len = min(len - pos,
                                falcon_spi_write_limit(spi, start + pos));
                command = falcon_spi_munge_command(spi, SPI_WRITE, start + pos);
                rc = falcon_spi_cmd(efx, spi, command, start + pos,
                                    buffer + pos, NULL, block_len);
                if (rc)
                        break;

                rc = falcon_spi_wait_write(efx, spi);
                if (rc)
                        break;

                command = falcon_spi_munge_command(spi, SPI_READ, start + pos);
                rc = falcon_spi_cmd(efx, spi, command, start + pos,
                                    NULL, verify_buffer, block_len);
                if (memcmp(verify_buffer, buffer + pos, block_len)) {
                        rc = -EIO;
                        break;
                }

                pos += block_len;

                /* Avoid locking up the system */
                cond_resched();
                if (signal_pending(current)) {
                        rc = -EINTR;
                        break;
                }
        }

        if (retlen)
                *retlen = pos;
        return rc;
}

static int
falcon_spi_slow_wait(struct falcon_mtd_partition *part, bool uninterruptible)
{
        const struct falcon_spi_device *spi = part->spi;
        struct efx_nic *efx = part->common.mtd.priv;
        u8 status;
        int rc, i;

        /* Wait up to 4s for flash/EEPROM to finish a slow operation. */
        for (i = 0; i < 40; i++) {
                __set_current_state(uninterruptible ?
                                    TASK_UNINTERRUPTIBLE : TASK_INTERRUPTIBLE);
                schedule_timeout(HZ / 10);
                rc = falcon_spi_cmd(efx, spi, SPI_RDSR, -1, NULL,
                                    &status, sizeof(status));
                if (rc)
                        return rc;
                if (!(status & SPI_STATUS_NRDY))
                        return 0;
                if (signal_pending(current))
                        return -EINTR;
        }
        pr_err("%s: timed out waiting for %s\n",
               part->common.name, part->common.dev_type_name);
        return -ETIMEDOUT;
}

static int
falcon_spi_unlock(struct efx_nic *efx, const struct falcon_spi_device *spi)
{
        const u8 unlock_mask = (SPI_STATUS_BP2 | SPI_STATUS_BP1 |
                                SPI_STATUS_BP0);
        u8 status;
        int rc;

        rc = falcon_spi_cmd(efx, spi, SPI_RDSR, -1, NULL,
                            &status, sizeof(status));
        if (rc)
                return rc;

        if (!(status & unlock_mask))
                return 0; /* already unlocked */

        rc = falcon_spi_cmd(efx, spi, SPI_WREN, -1, NULL, NULL, 0);
        if (rc)
                return rc;
        rc = falcon_spi_cmd(efx, spi, SPI_SST_EWSR, -1, NULL, NULL, 0);
        if (rc)
                return rc;

        status &= ~unlock_mask;
        rc = falcon_spi_cmd(efx, spi, SPI_WRSR, -1, &status,
                            NULL, sizeof(status));
        if (rc)
                return rc;
        rc = falcon_spi_wait_write(efx, spi);
        if (rc)
                return rc;

        return 0;
}

#define FALCON_SPI_VERIFY_BUF_LEN 16

static int
falcon_spi_erase(struct falcon_mtd_partition *part, loff_t start, size_t len)
{
        const struct falcon_spi_device *spi = part->spi;
        struct efx_nic *efx = part->common.mtd.priv;
        unsigned pos, block_len;
        u8 empty[FALCON_SPI_VERIFY_BUF_LEN];
        u8 buffer[FALCON_SPI_VERIFY_BUF_LEN];
        int rc;

        if (len != spi->erase_size)
                return -EINVAL;

        if (spi->erase_command == 0)
                return -EOPNOTSUPP;

        rc = falcon_spi_unlock(efx, spi);
        if (rc)
                return rc;
        rc = falcon_spi_cmd(efx, spi, SPI_WREN, -1, NULL, NULL, 0);
        if (rc)
                return rc;
        rc = falcon_spi_cmd(efx, spi, spi->erase_command, start, NULL,
                            NULL, 0);
        if (rc)
                return rc;
        rc = falcon_spi_slow_wait(part, false);

        /* Verify the entire region has been wiped */
        memset(empty, 0xff, sizeof(empty));
        for (pos = 0; pos < len; pos += block_len) {
                block_len = min(len - pos, sizeof(buffer));
                rc = falcon_spi_read(efx, spi, start + pos, block_len,
                                     NULL, buffer);
                if (rc)
                        return rc;
                if (memcmp(empty, buffer, block_len))
                        return -EIO;

                /* Avoid locking up the system */
                cond_resched();
                if (signal_pending(current))
                        return -EINTR;
        }

        return rc;
}

static void falcon_mtd_rename(struct efx_mtd_partition *part)
{
        struct efx_nic *efx = part->mtd.priv;

        snprintf(part->name, sizeof(part->name), "%s %s",
                 efx->name, part->type_name);
}

static int falcon_mtd_read(struct mtd_info *mtd, loff_t start,
                           size_t len, size_t *retlen, u8 *buffer)
{
        struct falcon_mtd_partition *part = to_falcon_mtd_partition(mtd);
        struct efx_nic *efx = mtd->priv;
        struct falcon_nic_data *nic_data = efx->nic_data;
        int rc;

        rc = mutex_lock_interruptible(&nic_data->spi_lock);
        if (rc)
                return rc;
        rc = falcon_spi_read(efx, part->spi, part->offset + start,
                             len, retlen, buffer);
        mutex_unlock(&nic_data->spi_lock);
        return rc;
}

static int falcon_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
{
        struct falcon_mtd_partition *part = to_falcon_mtd_partition(mtd);
        struct efx_nic *efx = mtd->priv;
        struct falcon_nic_data *nic_data = efx->nic_data;
        int rc;

        rc = mutex_lock_interruptible(&nic_data->spi_lock);
        if (rc)
                return rc;
        rc = falcon_spi_erase(part, part->offset + start, len);
        mutex_unlock(&nic_data->spi_lock);
        return rc;
}

static int falcon_mtd_write(struct mtd_info *mtd, loff_t start,
                            size_t len, size_t *retlen, const u8 *buffer)
{
        struct falcon_mtd_partition *part = to_falcon_mtd_partition(mtd);
        struct efx_nic *efx = mtd->priv;
        struct falcon_nic_data *nic_data = efx->nic_data;
        int rc;

        rc = mutex_lock_interruptible(&nic_data->spi_lock);
        if (rc)
                return rc;
        rc = falcon_spi_write(efx, part->spi, part->offset + start,
                              len, retlen, buffer);
        mutex_unlock(&nic_data->spi_lock);
        return rc;
}

static int falcon_mtd_sync(struct mtd_info *mtd)
{
        struct falcon_mtd_partition *part = to_falcon_mtd_partition(mtd);
        struct efx_nic *efx = mtd->priv;
        struct falcon_nic_data *nic_data = efx->nic_data;
        int rc;

        mutex_lock(&nic_data->spi_lock);
        rc = falcon_spi_slow_wait(part, true);
        mutex_unlock(&nic_data->spi_lock);
        return rc;
}

static int falcon_mtd_probe(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        struct falcon_mtd_partition *parts;
        struct falcon_spi_device *spi;
        size_t n_parts;
        int rc = -ENODEV;

        ASSERT_RTNL();

        /* Allocate space for maximum number of partitions */
        parts = kcalloc(2, sizeof(*parts), GFP_KERNEL);
        if (!parts)
                return -ENOMEM;
        n_parts = 0;

        spi = &nic_data->spi_flash;
        if (falcon_spi_present(spi) && spi->size > FALCON_FLASH_BOOTCODE_START) {
                parts[n_parts].spi = spi;
                parts[n_parts].offset = FALCON_FLASH_BOOTCODE_START;
                parts[n_parts].common.dev_type_name = "flash";
                parts[n_parts].common.type_name = "sfc_flash_bootrom";
                parts[n_parts].common.mtd.type = MTD_NORFLASH;
                parts[n_parts].common.mtd.flags = MTD_CAP_NORFLASH;
                parts[n_parts].common.mtd.size = spi->size - FALCON_FLASH_BOOTCODE_START;
                parts[n_parts].common.mtd.erasesize = spi->erase_size;
                n_parts++;
        }

        spi = &nic_data->spi_eeprom;
        if (falcon_spi_present(spi) && spi->size > FALCON_EEPROM_BOOTCONFIG_START) {
                parts[n_parts].spi = spi;
                parts[n_parts].offset = FALCON_EEPROM_BOOTCONFIG_START;
                parts[n_parts].common.dev_type_name = "EEPROM";
                parts[n_parts].common.type_name = "sfc_bootconfig";
                parts[n_parts].common.mtd.type = MTD_RAM;
                parts[n_parts].common.mtd.flags = MTD_CAP_RAM;
                parts[n_parts].common.mtd.size =
                        min(spi->size, FALCON_EEPROM_BOOTCONFIG_END) -
                        FALCON_EEPROM_BOOTCONFIG_START;
                parts[n_parts].common.mtd.erasesize = spi->erase_size;
                n_parts++;
        }

        rc = efx_mtd_add(efx, &parts[0].common, n_parts, sizeof(*parts));
        if (rc)
                kfree(parts);
        return rc;
}

#endif /* CONFIG_SFC_MTD */

/**************************************************************************
 *
 * XMAC operations
 *
 **************************************************************************
 */

/* Configure the XAUI driver that is an output from Falcon */
static void falcon_setup_xaui(struct efx_nic *efx)
{
        efx_oword_t sdctl, txdrv;

        /* Move the XAUI into low power, unless there is no PHY, in
         * which case the XAUI will have to drive a cable. */
        if (efx->phy_type == PHY_TYPE_NONE)
                return;

        efx_reado(efx, &sdctl, FR_AB_XX_SD_CTL);
        EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVD, FFE_AB_XX_SD_CTL_DRV_DEF);
        EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVD, FFE_AB_XX_SD_CTL_DRV_DEF);
        EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVC, FFE_AB_XX_SD_CTL_DRV_DEF);
        EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVC, FFE_AB_XX_SD_CTL_DRV_DEF);
        EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVB, FFE_AB_XX_SD_CTL_DRV_DEF);
        EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVB, FFE_AB_XX_SD_CTL_DRV_DEF);
        EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_HIDRVA, FFE_AB_XX_SD_CTL_DRV_DEF);
        EFX_SET_OWORD_FIELD(sdctl, FRF_AB_XX_LODRVA, FFE_AB_XX_SD_CTL_DRV_DEF);
        efx_writeo(efx, &sdctl, FR_AB_XX_SD_CTL);

        EFX_POPULATE_OWORD_8(txdrv,
                             FRF_AB_XX_DEQD, FFE_AB_XX_TXDRV_DEQ_DEF,

                             FRF_AB_XX_DEQC, FFE_AB_XX_TXDRV_DEQ_DEF,
                             FRF_AB_XX_DEQB, FFE_AB_XX_TXDRV_DEQ_DEF,
                             FRF_AB_XX_DEQA, FFE_AB_XX_TXDRV_DEQ_DEF,
                             FRF_AB_XX_DTXD, FFE_AB_XX_TXDRV_DTX_DEF,
                             FRF_AB_XX_DTXC, FFE_AB_XX_TXDRV_DTX_DEF,
                             FRF_AB_XX_DTXB, FFE_AB_XX_TXDRV_DTX_DEF,
                             FRF_AB_XX_DTXA, FFE_AB_XX_TXDRV_DTX_DEF);
        efx_writeo(efx, &txdrv, FR_AB_XX_TXDRV_CTL);
}

int falcon_reset_xaui(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        efx_oword_t reg;
        int count;

        /* Don't fetch MAC statistics over an XMAC reset */
        WARN_ON(nic_data->stats_disable_count == 0);

        /* Start reset sequence */
        EFX_POPULATE_OWORD_1(reg, FRF_AB_XX_RST_XX_EN, 1);
        efx_writeo(efx, &reg, FR_AB_XX_PWR_RST);

        /* Wait up to 10 ms for completion, then reinitialise */
        for (count = 0; count < 1000; count++) {
                efx_reado(efx, &reg, FR_AB_XX_PWR_RST);
                if (EFX_OWORD_FIELD(reg, FRF_AB_XX_RST_XX_EN) == 0 &&
                    EFX_OWORD_FIELD(reg, FRF_AB_XX_SD_RST_ACT) == 0) {
                        falcon_setup_xaui(efx);
                        return 0;
                }
                udelay(10);
        }
        netif_err(efx, hw, efx->net_dev,
                  "timed out waiting for XAUI/XGXS reset\n");
        return -ETIMEDOUT;
}

static void falcon_ack_status_intr(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        efx_oword_t reg;

        if ((efx_nic_rev(efx) != EFX_REV_FALCON_B0) || LOOPBACK_INTERNAL(efx))
                return;

        /* We expect xgmii faults if the wireside link is down */
        if (!efx->link_state.up)
                return;

        /* We can only use this interrupt to signal the negative edge of
         * xaui_align [we have to poll the positive edge]. */
        if (nic_data->xmac_poll_required)
                return;

        efx_reado(efx, &reg, FR_AB_XM_MGT_INT_MSK);
}

static bool falcon_xgxs_link_ok(struct efx_nic *efx)
{
        efx_oword_t reg;
        bool align_done, link_ok = false;
        int sync_status;

        /* Read link status */
        efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);

        align_done = EFX_OWORD_FIELD(reg, FRF_AB_XX_ALIGN_DONE);
        sync_status = EFX_OWORD_FIELD(reg, FRF_AB_XX_SYNC_STAT);
        if (align_done && (sync_status == FFE_AB_XX_STAT_ALL_LANES))
                link_ok = true;

        /* Clear link status ready for next read */
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_COMMA_DET, FFE_AB_XX_STAT_ALL_LANES);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_CHAR_ERR, FFE_AB_XX_STAT_ALL_LANES);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_DISPERR, FFE_AB_XX_STAT_ALL_LANES);
        efx_writeo(efx, &reg, FR_AB_XX_CORE_STAT);

        return link_ok;
}

static bool falcon_xmac_link_ok(struct efx_nic *efx)
{
        /*
         * Check MAC's XGXS link status except when using XGMII loopback
         * which bypasses the XGXS block.
         * If possible, check PHY's XGXS link status except when using
         * MAC loopback.
         */
        return (efx->loopback_mode == LOOPBACK_XGMII ||
                falcon_xgxs_link_ok(efx)) &&
                (!(efx->mdio.mmds & (1 << MDIO_MMD_PHYXS)) ||
                 LOOPBACK_INTERNAL(efx) ||
                 efx_mdio_phyxgxs_lane_sync(efx));
}

static void falcon_reconfigure_xmac_core(struct efx_nic *efx)
{
        unsigned int max_frame_len;
        efx_oword_t reg;
        bool rx_fc = !!(efx->link_state.fc & EFX_FC_RX);
        bool tx_fc = !!(efx->link_state.fc & EFX_FC_TX);

        /* Configure MAC  - cut-thru mode is hard wired on */
        EFX_POPULATE_OWORD_3(reg,
                             FRF_AB_XM_RX_JUMBO_MODE, 1,
                             FRF_AB_XM_TX_STAT_EN, 1,
                             FRF_AB_XM_RX_STAT_EN, 1);
        efx_writeo(efx, &reg, FR_AB_XM_GLB_CFG);

        /* Configure TX */
        EFX_POPULATE_OWORD_6(reg,
                             FRF_AB_XM_TXEN, 1,
                             FRF_AB_XM_TX_PRMBL, 1,
                             FRF_AB_XM_AUTO_PAD, 1,
                             FRF_AB_XM_TXCRC, 1,
                             FRF_AB_XM_FCNTL, tx_fc,
                             FRF_AB_XM_IPG, 0x3);
        efx_writeo(efx, &reg, FR_AB_XM_TX_CFG);

        /* Configure RX */
        EFX_POPULATE_OWORD_5(reg,
                             FRF_AB_XM_RXEN, 1,
                             FRF_AB_XM_AUTO_DEPAD, 0,
                             FRF_AB_XM_ACPT_ALL_MCAST, 1,
                             FRF_AB_XM_ACPT_ALL_UCAST, !efx->unicast_filter,
                             FRF_AB_XM_PASS_CRC_ERR, 1);
        efx_writeo(efx, &reg, FR_AB_XM_RX_CFG);

        /* Set frame length */
        max_frame_len = EFX_MAX_FRAME_LEN(efx->net_dev->mtu);
        EFX_POPULATE_OWORD_1(reg, FRF_AB_XM_MAX_RX_FRM_SIZE, max_frame_len);
        efx_writeo(efx, &reg, FR_AB_XM_RX_PARAM);
        EFX_POPULATE_OWORD_2(reg,
                             FRF_AB_XM_MAX_TX_FRM_SIZE, max_frame_len,
                             FRF_AB_XM_TX_JUMBO_MODE, 1);
        efx_writeo(efx, &reg, FR_AB_XM_TX_PARAM);

        EFX_POPULATE_OWORD_2(reg,
                             FRF_AB_XM_PAUSE_TIME, 0xfffe, /* MAX PAUSE TIME */
                             FRF_AB_XM_DIS_FCNTL, !rx_fc);
        efx_writeo(efx, &reg, FR_AB_XM_FC);

        /* Set MAC address */
        memcpy(&reg, &efx->net_dev->dev_addr[0], 4);
        efx_writeo(efx, &reg, FR_AB_XM_ADR_LO);
        memcpy(&reg, &efx->net_dev->dev_addr[4], 2);
        efx_writeo(efx, &reg, FR_AB_XM_ADR_HI);
}

static void falcon_reconfigure_xgxs_core(struct efx_nic *efx)
{
        efx_oword_t reg;
        bool xgxs_loopback = (efx->loopback_mode == LOOPBACK_XGXS);
        bool xaui_loopback = (efx->loopback_mode == LOOPBACK_XAUI);
        bool xgmii_loopback = (efx->loopback_mode == LOOPBACK_XGMII);
        bool old_xgmii_loopback, old_xgxs_loopback, old_xaui_loopback;

        /* XGXS block is flaky and will need to be reset if moving
         * into our out of XGMII, XGXS or XAUI loopbacks. */
        efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
        old_xgxs_loopback = EFX_OWORD_FIELD(reg, FRF_AB_XX_XGXS_LB_EN);
        old_xgmii_loopback = EFX_OWORD_FIELD(reg, FRF_AB_XX_XGMII_LB_EN);

        efx_reado(efx, &reg, FR_AB_XX_SD_CTL);
        old_xaui_loopback = EFX_OWORD_FIELD(reg, FRF_AB_XX_LPBKA);

        /* The PHY driver may have turned XAUI off */
        if ((xgxs_loopback != old_xgxs_loopback) ||
            (xaui_loopback != old_xaui_loopback) ||
            (xgmii_loopback != old_xgmii_loopback))
                falcon_reset_xaui(efx);

        efx_reado(efx, &reg, FR_AB_XX_CORE_STAT);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_FORCE_SIG,
                            (xgxs_loopback || xaui_loopback) ?
                            FFE_AB_XX_FORCE_SIG_ALL_LANES : 0);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_XGXS_LB_EN, xgxs_loopback);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_XGMII_LB_EN, xgmii_loopback);
        efx_writeo(efx, &reg, FR_AB_XX_CORE_STAT);

        efx_reado(efx, &reg, FR_AB_XX_SD_CTL);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKD, xaui_loopback);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKC, xaui_loopback);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKB, xaui_loopback);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_XX_LPBKA, xaui_loopback);
        efx_writeo(efx, &reg, FR_AB_XX_SD_CTL);
}


/* Try to bring up the Falcon side of the Falcon-Phy XAUI link */
static bool falcon_xmac_link_ok_retry(struct efx_nic *efx, int tries)
{
        bool mac_up = falcon_xmac_link_ok(efx);

        if (LOOPBACK_MASK(efx) & LOOPBACKS_EXTERNAL(efx) & LOOPBACKS_WS ||
            efx_phy_mode_disabled(efx->phy_mode))
                /* XAUI link is expected to be down */
                return mac_up;

        falcon_stop_nic_stats(efx);

        while (!mac_up && tries) {
                netif_dbg(efx, hw, efx->net_dev, "bashing xaui\n");
                falcon_reset_xaui(efx);
                udelay(200);

                mac_up = falcon_xmac_link_ok(efx);
                --tries;
        }

        falcon_start_nic_stats(efx);

        return mac_up;
}

static bool falcon_xmac_check_fault(struct efx_nic *efx)
{
        return !falcon_xmac_link_ok_retry(efx, 5);
}

static int falcon_reconfigure_xmac(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;

        efx_farch_filter_sync_rx_mode(efx);

        falcon_reconfigure_xgxs_core(efx);
        falcon_reconfigure_xmac_core(efx);

        falcon_reconfigure_mac_wrapper(efx);

        nic_data->xmac_poll_required = !falcon_xmac_link_ok_retry(efx, 5);
        falcon_ack_status_intr(efx);

        return 0;
}

static void falcon_poll_xmac(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;

        /* We expect xgmii faults if the wireside link is down */
        if (!efx->link_state.up || !nic_data->xmac_poll_required)
                return;

        nic_data->xmac_poll_required = !falcon_xmac_link_ok_retry(efx, 1);
        falcon_ack_status_intr(efx);
}

/**************************************************************************
 *
 * MAC wrapper
 *
 **************************************************************************
 */

static void falcon_push_multicast_hash(struct efx_nic *efx)
{
        union efx_multicast_hash *mc_hash = &efx->multicast_hash;

        WARN_ON(!mutex_is_locked(&efx->mac_lock));

        efx_writeo(efx, &mc_hash->oword[0], FR_AB_MAC_MC_HASH_REG0);
        efx_writeo(efx, &mc_hash->oword[1], FR_AB_MAC_MC_HASH_REG1);
}

static void falcon_reset_macs(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        efx_oword_t reg, mac_ctrl;
        int count;

        if (efx_nic_rev(efx) < EFX_REV_FALCON_B0) {
                /* It's not safe to use GLB_CTL_REG to reset the
                 * macs, so instead use the internal MAC resets
                 */
                EFX_POPULATE_OWORD_1(reg, FRF_AB_XM_CORE_RST, 1);
                efx_writeo(efx, &reg, FR_AB_XM_GLB_CFG);

                for (count = 0; count < 10000; count++) {
                        efx_reado(efx, &reg, FR_AB_XM_GLB_CFG);
                        if (EFX_OWORD_FIELD(reg, FRF_AB_XM_CORE_RST) ==
                            0)
                                return;
                        udelay(10);
                }

                netif_err(efx, hw, efx->net_dev,
                          "timed out waiting for XMAC core reset\n");
        }

        /* Mac stats will fail whist the TX fifo is draining */
        WARN_ON(nic_data->stats_disable_count == 0);

        efx_reado(efx, &mac_ctrl, FR_AB_MAC_CTRL);
        EFX_SET_OWORD_FIELD(mac_ctrl, FRF_BB_TXFIFO_DRAIN_EN, 1);
        efx_writeo(efx, &mac_ctrl, FR_AB_MAC_CTRL);

        efx_reado(efx, &reg, FR_AB_GLB_CTL);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_RST_XGTX, 1);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_RST_XGRX, 1);
        EFX_SET_OWORD_FIELD(reg, FRF_AB_RST_EM, 1);
        efx_writeo(efx, &reg, FR_AB_GLB_CTL);

        count = 0;
        while (1) {
                efx_reado(efx, &reg, FR_AB_GLB_CTL);
                if (!EFX_OWORD_FIELD(reg, FRF_AB_RST_XGTX) &&
                    !EFX_OWORD_FIELD(reg, FRF_AB_RST_XGRX) &&
                    !EFX_OWORD_FIELD(reg, FRF_AB_RST_EM)) {
                        netif_dbg(efx, hw, efx->net_dev,
                                  "Completed MAC reset after %d loops\n",
                                  count);
                        break;
                }
                if (count > 20) {
                        netif_err(efx, hw, efx->net_dev, "MAC reset failed\n");
                        break;
                }
                count++;
                udelay(10);
        }

        /* Ensure the correct MAC is selected before statistics
         * are re-enabled by the caller */
        efx_writeo(efx, &mac_ctrl, FR_AB_MAC_CTRL);

        falcon_setup_xaui(efx);
}

static void falcon_drain_tx_fifo(struct efx_nic *efx)
{
        efx_oword_t reg;

        if ((efx_nic_rev(efx) < EFX_REV_FALCON_B0) ||
            (efx->loopback_mode != LOOPBACK_NONE))
                return;

        efx_reado(efx, &reg, FR_AB_MAC_CTRL);
        /* There is no point in draining more than once */
        if (EFX_OWORD_FIELD(reg, FRF_BB_TXFIFO_DRAIN_EN))
                return;

        falcon_reset_macs(efx);
}

static void falcon_deconfigure_mac_wrapper(struct efx_nic *efx)
{
        efx_oword_t reg;

        if (efx_nic_rev(efx) < EFX_REV_FALCON_B0)
                return;

        /* Isolate the MAC -> RX */
        efx_reado(efx, &reg, FR_AZ_RX_CFG);
        EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_INGR_EN, 0);
        efx_writeo(efx, &reg, FR_AZ_RX_CFG);

        /* Isolate TX -> MAC */
        falcon_drain_tx_fifo(efx);
}

static void falcon_reconfigure_mac_wrapper(struct efx_nic *efx)
{
        struct efx_link_state *link_state = &efx->link_state;
        efx_oword_t reg;
        int link_speed, isolate;

        isolate = !!ACCESS_ONCE(efx->reset_pending);

        switch (link_state->speed) {
        case 10000: link_speed = 3; break;
        case 1000:  link_speed = 2; break;
        case 100:   link_speed = 1; break;
        default:    link_speed = 0; break;
        }

        /* MAC_LINK_STATUS controls MAC backpressure but doesn't work
         * as advertised.  Disable to ensure packets are not
         * indefinitely held and TX queue can be flushed at any point
         * while the link is down. */
        EFX_POPULATE_OWORD_5(reg,
                             FRF_AB_MAC_XOFF_VAL, 0xffff /* max pause time */,
                             FRF_AB_MAC_BCAD_ACPT, 1,
                             FRF_AB_MAC_UC_PROM, !efx->unicast_filter,
                             FRF_AB_MAC_LINK_STATUS, 1, /* always set */
                             FRF_AB_MAC_SPEED, link_speed);
        /* On B0, MAC backpressure can be disabled and packets get
         * discarded. */
        if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) {
                EFX_SET_OWORD_FIELD(reg, FRF_BB_TXFIFO_DRAIN_EN,
                                    !link_state->up || isolate);
        }

        efx_writeo(efx, &reg, FR_AB_MAC_CTRL);

        /* Restore the multicast hash registers. */
        falcon_push_multicast_hash(efx);

        efx_reado(efx, &reg, FR_AZ_RX_CFG);
        /* Enable XOFF signal from RX FIFO (we enabled it during NIC
         * initialisation but it may read back as 0) */
        EFX_SET_OWORD_FIELD(reg, FRF_AZ_RX_XOFF_MAC_EN, 1);
        /* Unisolate the MAC -> RX */
        if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_INGR_EN, !isolate);
        efx_writeo(efx, &reg, FR_AZ_RX_CFG);
}

static void falcon_stats_request(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        efx_oword_t reg;

        WARN_ON(nic_data->stats_pending);
        WARN_ON(nic_data->stats_disable_count);

        FALCON_XMAC_STATS_DMA_FLAG(efx) = 0;
        nic_data->stats_pending = true;
        wmb(); /* ensure done flag is clear */

        /* Initiate DMA transfer of stats */
        EFX_POPULATE_OWORD_2(reg,
                             FRF_AB_MAC_STAT_DMA_CMD, 1,
                             FRF_AB_MAC_STAT_DMA_ADR,
                             efx->stats_buffer.dma_addr);
        efx_writeo(efx, &reg, FR_AB_MAC_STAT_DMA);

        mod_timer(&nic_data->stats_timer, round_jiffies_up(jiffies + HZ / 2));
}

static void falcon_stats_complete(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;

        if (!nic_data->stats_pending)
                return;

        nic_data->stats_pending = false;
        if (FALCON_XMAC_STATS_DMA_FLAG(efx)) {
                rmb(); /* read the done flag before the stats */
                efx_nic_update_stats(falcon_stat_desc, FALCON_STAT_COUNT,
                                     falcon_stat_mask, nic_data->stats,
                                     efx->stats_buffer.addr, true);
        } else {
                netif_err(efx, hw, efx->net_dev,
                          "timed out waiting for statistics\n");
        }
}

static void falcon_stats_timer_func(unsigned long context)
{
        struct efx_nic *efx = (struct efx_nic *)context;
        struct falcon_nic_data *nic_data = efx->nic_data;

        spin_lock(&efx->stats_lock);

        falcon_stats_complete(efx);
        if (nic_data->stats_disable_count == 0)
                falcon_stats_request(efx);

        spin_unlock(&efx->stats_lock);
}

static bool falcon_loopback_link_poll(struct efx_nic *efx)
{
        struct efx_link_state old_state = efx->link_state;

        WARN_ON(!mutex_is_locked(&efx->mac_lock));
        WARN_ON(!LOOPBACK_INTERNAL(efx));

        efx->link_state.fd = true;
        efx->link_state.fc = efx->wanted_fc;
        efx->link_state.up = true;
        efx->link_state.speed = 10000;

        return !efx_link_state_equal(&efx->link_state, &old_state);
}

static int falcon_reconfigure_port(struct efx_nic *efx)
{
        int rc;

        WARN_ON(efx_nic_rev(efx) > EFX_REV_FALCON_B0);

        /* Poll the PHY link state *before* reconfiguring it. This means we
         * will pick up the correct speed (in loopback) to select the correct
         * MAC.
         */
        if (LOOPBACK_INTERNAL(efx))
                falcon_loopback_link_poll(efx);
        else
                efx->phy_op->poll(efx);

        falcon_stop_nic_stats(efx);
        falcon_deconfigure_mac_wrapper(efx);

        falcon_reset_macs(efx);

        efx->phy_op->reconfigure(efx);
        rc = falcon_reconfigure_xmac(efx);
        BUG_ON(rc);

        falcon_start_nic_stats(efx);

        /* Synchronise efx->link_state with the kernel */
        efx_link_status_changed(efx);

        return 0;
}

/* TX flow control may automatically turn itself off if the link
 * partner (intermittently) stops responding to pause frames. There
 * isn't any indication that this has happened, so the best we do is
 * leave it up to the user to spot this and fix it by cycling transmit
 * flow control on this end.
 */

static void falcon_a1_prepare_enable_fc_tx(struct efx_nic *efx)
{
        /* Schedule a reset to recover */
        efx_schedule_reset(efx, RESET_TYPE_INVISIBLE);
}

static void falcon_b0_prepare_enable_fc_tx(struct efx_nic *efx)
{
        /* Recover by resetting the EM block */
        falcon_stop_nic_stats(efx);
        falcon_drain_tx_fifo(efx);
        falcon_reconfigure_xmac(efx);
        falcon_start_nic_stats(efx);
}

/**************************************************************************
 *
 * PHY access via GMII
 *
 **************************************************************************
 */

/* Wait for GMII access to complete */
static int falcon_gmii_wait(struct efx_nic *efx)
{
        efx_oword_t md_stat;
        int count;

        /* wait up to 50ms - taken max from datasheet */
        for (count = 0; count < 5000; count++) {
                efx_reado(efx, &md_stat, FR_AB_MD_STAT);
                if (EFX_OWORD_FIELD(md_stat, FRF_AB_MD_BSY) == 0) {
                        if (EFX_OWORD_FIELD(md_stat, FRF_AB_MD_LNFL) != 0 ||
                            EFX_OWORD_FIELD(md_stat, FRF_AB_MD_BSERR) != 0) {
                                netif_err(efx, hw, efx->net_dev,
                                          "error from GMII access "
                                          EFX_OWORD_FMT"\n",
                                          EFX_OWORD_VAL(md_stat));
                                return -EIO;
                        }
                        return 0;
                }
                udelay(10);
        }
        netif_err(efx, hw, efx->net_dev, "timed out waiting for GMII\n");
        return -ETIMEDOUT;
}

/* Write an MDIO register of a PHY connected to Falcon. */
static int falcon_mdio_write(struct net_device *net_dev,
                             int prtad, int devad, u16 addr, u16 value)
{
        struct efx_nic *efx = netdev_priv(net_dev);
        struct falcon_nic_data *nic_data = efx->nic_data;
        efx_oword_t reg;
        int rc;

        netif_vdbg(efx, hw, efx->net_dev,
                   "writing MDIO %d register %d.%d with 0x%04x\n",
                    prtad, devad, addr, value);

        mutex_lock(&nic_data->mdio_lock);

        /* Check MDIO not currently being accessed */
        rc = falcon_gmii_wait(efx);
        if (rc)
                goto out;

        /* Write the address/ID register */
        EFX_POPULATE_OWORD_1(reg, FRF_AB_MD_PHY_ADR, addr);
        efx_writeo(efx, &reg, FR_AB_MD_PHY_ADR);

        EFX_POPULATE_OWORD_2(reg, FRF_AB_MD_PRT_ADR, prtad,
                             FRF_AB_MD_DEV_ADR, devad);
        efx_writeo(efx, &reg, FR_AB_MD_ID);

        /* Write data */
        EFX_POPULATE_OWORD_1(reg, FRF_AB_MD_TXD, value);
        efx_writeo(efx, &reg, FR_AB_MD_TXD);

        EFX_POPULATE_OWORD_2(reg,
                             FRF_AB_MD_WRC, 1,
                             FRF_AB_MD_GC, 0);
        efx_writeo(efx, &reg, FR_AB_MD_CS);

        /* Wait for data to be written */
        rc = falcon_gmii_wait(efx);
        if (rc) {
                /* Abort the write operation */
                EFX_POPULATE_OWORD_2(reg,
                                     FRF_AB_MD_WRC, 0,
                                     FRF_AB_MD_GC, 1);
                efx_writeo(efx, &reg, FR_AB_MD_CS);
                udelay(10);
        }

out:
        mutex_unlock(&nic_data->mdio_lock);
        return rc;
}

/* Read an MDIO register of a PHY connected to Falcon. */
static int falcon_mdio_read(struct net_device *net_dev,
                            int prtad, int devad, u16 addr)
{
        struct efx_nic *efx = netdev_priv(net_dev);
        struct falcon_nic_data *nic_data = efx->nic_data;
        efx_oword_t reg;
        int rc;

        mutex_lock(&nic_data->mdio_lock);

        /* Check MDIO not currently being accessed */
        rc = falcon_gmii_wait(efx);
        if (rc)
                goto out;

        EFX_POPULATE_OWORD_1(reg, FRF_AB_MD_PHY_ADR, addr);
        efx_writeo(efx, &reg, FR_AB_MD_PHY_ADR);

        EFX_POPULATE_OWORD_2(reg, FRF_AB_MD_PRT_ADR, prtad,
                             FRF_AB_MD_DEV_ADR, devad);
        efx_writeo(efx, &reg, FR_AB_MD_ID);

        /* Request data to be read */
        EFX_POPULATE_OWORD_2(reg, FRF_AB_MD_RDC, 1, FRF_AB_MD_GC, 0);
        efx_writeo(efx, &reg, FR_AB_MD_CS);

        /* Wait for data to become available */
        rc = falcon_gmii_wait(efx);
        if (rc == 0) {
                efx_reado(efx, &reg, FR_AB_MD_RXD);
                rc = EFX_OWORD_FIELD(reg, FRF_AB_MD_RXD);
                netif_vdbg(efx, hw, efx->net_dev,
                           "read from MDIO %d register %d.%d, got %04x\n",
                           prtad, devad, addr, rc);
        } else {
                /* Abort the read operation */
                EFX_POPULATE_OWORD_2(reg,
                                     FRF_AB_MD_RIC, 0,
                                     FRF_AB_MD_GC, 1);
                efx_writeo(efx, &reg, FR_AB_MD_CS);

                netif_dbg(efx, hw, efx->net_dev,
                          "read from MDIO %d register %d.%d, got error %d\n",
                          prtad, devad, addr, rc);
        }

out:
        mutex_unlock(&nic_data->mdio_lock);
        return rc;
}

/* This call is responsible for hooking in the MAC and PHY operations */
static int falcon_probe_port(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        int rc;

        switch (efx->phy_type) {
        case PHY_TYPE_SFX7101:
                efx->phy_op = &falcon_sfx7101_phy_ops;
                break;
        case PHY_TYPE_QT2022C2:
        case PHY_TYPE_QT2025C:
                efx->phy_op = &falcon_qt202x_phy_ops;
                break;
        case PHY_TYPE_TXC43128:
                efx->phy_op = &falcon_txc_phy_ops;
                break;
        default:
                netif_err(efx, probe, efx->net_dev, "Unknown PHY type %d\n",
                          efx->phy_type);
                return -ENODEV;
        }

        /* Fill out MDIO structure and loopback modes */
        mutex_init(&nic_data->mdio_lock);
        efx->mdio.mdio_read = falcon_mdio_read;
        efx->mdio.mdio_write = falcon_mdio_write;
        rc = efx->phy_op->probe(efx);
        if (rc != 0)
                return rc;

        /* Initial assumption */
        efx->link_state.speed = 10000;
        efx->link_state.fd = true;

        /* Hardware flow ctrl. FalconA RX FIFO too small for pause generation */
        if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
                efx->wanted_fc = EFX_FC_RX | EFX_FC_TX;
        else
                efx->wanted_fc = EFX_FC_RX;
        if (efx->mdio.mmds & MDIO_DEVS_AN)
                efx->wanted_fc |= EFX_FC_AUTO;

        /* Allocate buffer for stats */
        rc = efx_nic_alloc_buffer(efx, &efx->stats_buffer,
                                  FALCON_MAC_STATS_SIZE, GFP_KERNEL);
        if (rc)
                return rc;
        netif_dbg(efx, probe, efx->net_dev,
                  "stats buffer at %llx (virt %p phys %llx)\n",
                  (u64)efx->stats_buffer.dma_addr,
                  efx->stats_buffer.addr,
                  (u64)virt_to_phys(efx->stats_buffer.addr));

        return 0;
}

static void falcon_remove_port(struct efx_nic *efx)
{
        efx->phy_op->remove(efx);
        efx_nic_free_buffer(efx, &efx->stats_buffer);
}

/* Global events are basically PHY events */
static bool
falcon_handle_global_event(struct efx_channel *channel, efx_qword_t *event)
{
        struct efx_nic *efx = channel->efx;
        struct falcon_nic_data *nic_data = efx->nic_data;

        if (EFX_QWORD_FIELD(*event, FSF_AB_GLB_EV_G_PHY0_INTR) ||
            EFX_QWORD_FIELD(*event, FSF_AB_GLB_EV_XG_PHY0_INTR) ||
            EFX_QWORD_FIELD(*event, FSF_AB_GLB_EV_XFP_PHY0_INTR))
                /* Ignored */
                return true;

        if ((efx_nic_rev(efx) == EFX_REV_FALCON_B0) &&
            EFX_QWORD_FIELD(*event, FSF_BB_GLB_EV_XG_MGT_INTR)) {
                nic_data->xmac_poll_required = true;
                return true;
        }

        if (efx_nic_rev(efx) <= EFX_REV_FALCON_A1 ?
            EFX_QWORD_FIELD(*event, FSF_AA_GLB_EV_RX_RECOVERY) :
            EFX_QWORD_FIELD(*event, FSF_BB_GLB_EV_RX_RECOVERY)) {
                netif_err(efx, rx_err, efx->net_dev,
                          "channel %d seen global RX_RESET event. Resetting.\n",
                          channel->channel);

                atomic_inc(&efx->rx_reset);
                efx_schedule_reset(efx, EFX_WORKAROUND_6555(efx) ?
                                   RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
                return true;
        }

        return false;
}

/**************************************************************************
 *
 * Falcon test code
 *
 **************************************************************************/

static int
falcon_read_nvram(struct efx_nic *efx, struct falcon_nvconfig *nvconfig_out)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        struct falcon_nvconfig *nvconfig;
        struct falcon_spi_device *spi;
        void *region;
        int rc, magic_num, struct_ver;
        __le16 *word, *limit;
        u32 csum;

        if (falcon_spi_present(&nic_data->spi_flash))
                spi = &nic_data->spi_flash;
        else if (falcon_spi_present(&nic_data->spi_eeprom))
                spi = &nic_data->spi_eeprom;
        else
                return -EINVAL;

        region = kmalloc(FALCON_NVCONFIG_END, GFP_KERNEL);
        if (!region)
                return -ENOMEM;
        nvconfig = region + FALCON_NVCONFIG_OFFSET;

        mutex_lock(&nic_data->spi_lock);
        rc = falcon_spi_read(efx, spi, 0, FALCON_NVCONFIG_END, NULL, region);
        mutex_unlock(&nic_data->spi_lock);
        if (rc) {
                netif_err(efx, hw, efx->net_dev, "Failed to read %s\n",
                          falcon_spi_present(&nic_data->spi_flash) ?
                          "flash" : "EEPROM");
                rc = -EIO;
                goto out;
        }

        magic_num = le16_to_cpu(nvconfig->board_magic_num);
        struct_ver = le16_to_cpu(nvconfig->board_struct_ver);

        rc = -EINVAL;
        if (magic_num != FALCON_NVCONFIG_BOARD_MAGIC_NUM) {
                netif_err(efx, hw, efx->net_dev,
                          "NVRAM bad magic 0x%x\n", magic_num);
                goto out;
        }
        if (struct_ver < 2) {
                netif_err(efx, hw, efx->net_dev,
                          "NVRAM has ancient version 0x%x\n", struct_ver);
                goto out;
        } else if (struct_ver < 4) {
                word = &nvconfig->board_magic_num;
                limit = (__le16 *) (nvconfig + 1);
        } else {
                word = region;
                limit = region + FALCON_NVCONFIG_END;
        }
        for (csum = 0; word < limit; ++word)
                csum += le16_to_cpu(*word);

        if (~csum & 0xffff) {
                netif_err(efx, hw, efx->net_dev,
                          "NVRAM has incorrect checksum\n");
                goto out;
        }

        rc = 0;
        if (nvconfig_out)
                memcpy(nvconfig_out, nvconfig, sizeof(*nvconfig));

 out:
        kfree(region);
        return rc;
}

static int falcon_test_nvram(struct efx_nic *efx)
{
        return falcon_read_nvram(efx, NULL);
}

static const struct efx_farch_register_test falcon_b0_register_tests[] = {
        { FR_AZ_ADR_REGION,
          EFX_OWORD32(0x0003FFFF, 0x0003FFFF, 0x0003FFFF, 0x0003FFFF) },
        { FR_AZ_RX_CFG,
          EFX_OWORD32(0xFFFFFFFE, 0x00017FFF, 0x00000000, 0x00000000) },
        { FR_AZ_TX_CFG,
          EFX_OWORD32(0x7FFF0037, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AZ_TX_RESERVED,
          EFX_OWORD32(0xFFFEFE80, 0x1FFFFFFF, 0x020000FE, 0x007FFFFF) },
        { FR_AB_MAC_CTRL,
          EFX_OWORD32(0xFFFF0000, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AZ_SRM_TX_DC_CFG,
          EFX_OWORD32(0x001FFFFF, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AZ_RX_DC_CFG,
          EFX_OWORD32(0x0000000F, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AZ_RX_DC_PF_WM,
          EFX_OWORD32(0x000003FF, 0x00000000, 0x00000000, 0x00000000) },
        { FR_BZ_DP_CTRL,
          EFX_OWORD32(0x00000FFF, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AB_GM_CFG2,
          EFX_OWORD32(0x00007337, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AB_GMF_CFG0,
          EFX_OWORD32(0x00001F1F, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AB_XM_GLB_CFG,
          EFX_OWORD32(0x00000C68, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AB_XM_TX_CFG,
          EFX_OWORD32(0x00080164, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AB_XM_RX_CFG,
          EFX_OWORD32(0x07100A0C, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AB_XM_RX_PARAM,
          EFX_OWORD32(0x00001FF8, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AB_XM_FC,
          EFX_OWORD32(0xFFFF0001, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AB_XM_ADR_LO,
          EFX_OWORD32(0xFFFFFFFF, 0x00000000, 0x00000000, 0x00000000) },
        { FR_AB_XX_SD_CTL,
          EFX_OWORD32(0x0003FF0F, 0x00000000, 0x00000000, 0x00000000) },
};

static int
falcon_b0_test_chip(struct efx_nic *efx, struct efx_self_tests *tests)
{
        enum reset_type reset_method = RESET_TYPE_INVISIBLE;
        int rc, rc2;

        mutex_lock(&efx->mac_lock);
        if (efx->loopback_modes) {
                /* We need the 312 clock from the PHY to test the XMAC
                 * registers, so move into XGMII loopback if available */
                if (efx->loopback_modes & (1 << LOOPBACK_XGMII))
                        efx->loopback_mode = LOOPBACK_XGMII;
                else
                        efx->loopback_mode = __ffs(efx->loopback_modes);
        }
        __efx_reconfigure_port(efx);
        mutex_unlock(&efx->mac_lock);

        efx_reset_down(efx, reset_method);

        tests->registers =
                efx_farch_test_registers(efx, falcon_b0_register_tests,
                                         ARRAY_SIZE(falcon_b0_register_tests))
                ? -1 : 1;

        rc = falcon_reset_hw(efx, reset_method);
        rc2 = efx_reset_up(efx, reset_method, rc == 0);
        return rc ? rc : rc2;
}

/**************************************************************************
 *
 * Device reset
 *
 **************************************************************************
 */

static enum reset_type falcon_map_reset_reason(enum reset_type reason)
{
        switch (reason) {
        case RESET_TYPE_RX_RECOVERY:
        case RESET_TYPE_DMA_ERROR:
        case RESET_TYPE_TX_SKIP:
                /* These can occasionally occur due to hardware bugs.
                 * We try to reset without disrupting the link.
                 */
                return RESET_TYPE_INVISIBLE;
        default:
                return RESET_TYPE_ALL;
        }
}

static int falcon_map_reset_flags(u32 *flags)
{
        enum {
                FALCON_RESET_INVISIBLE = (ETH_RESET_DMA | ETH_RESET_FILTER |
                                          ETH_RESET_OFFLOAD | ETH_RESET_MAC),
                FALCON_RESET_ALL = FALCON_RESET_INVISIBLE | ETH_RESET_PHY,
                FALCON_RESET_WORLD = FALCON_RESET_ALL | ETH_RESET_IRQ,
        };

        if ((*flags & FALCON_RESET_WORLD) == FALCON_RESET_WORLD) {
                *flags &= ~FALCON_RESET_WORLD;
                return RESET_TYPE_WORLD;
        }

        if ((*flags & FALCON_RESET_ALL) == FALCON_RESET_ALL) {
                *flags &= ~FALCON_RESET_ALL;
                return RESET_TYPE_ALL;
        }

        if ((*flags & FALCON_RESET_INVISIBLE) == FALCON_RESET_INVISIBLE) {
                *flags &= ~FALCON_RESET_INVISIBLE;
                return RESET_TYPE_INVISIBLE;
        }

        return -EINVAL;
}

/* Resets NIC to known state.  This routine must be called in process
 * context and is allowed to sleep. */
static int __falcon_reset_hw(struct efx_nic *efx, enum reset_type method)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        efx_oword_t glb_ctl_reg_ker;
        int rc;

        netif_dbg(efx, hw, efx->net_dev, "performing %s hardware reset\n",
                  RESET_TYPE(method));

        /* Initiate device reset */
        if (method == RESET_TYPE_WORLD) {
                rc = pci_save_state(efx->pci_dev);
                if (rc) {
                        netif_err(efx, drv, efx->net_dev,
                                  "failed to backup PCI state of primary "
                                  "function prior to hardware reset\n");
                        goto fail1;
                }
                if (efx_nic_is_dual_func(efx)) {
                        rc = pci_save_state(nic_data->pci_dev2);
                        if (rc) {
                                netif_err(efx, drv, efx->net_dev,
                                          "failed to backup PCI state of "
                                          "secondary function prior to "
                                          "hardware reset\n");
                                goto fail2;
                        }

                }

                EFX_POPULATE_OWORD_2(glb_ctl_reg_ker,
                                     FRF_AB_EXT_PHY_RST_DUR,
                                     FFE_AB_EXT_PHY_RST_DUR_10240US,
                                     FRF_AB_SWRST, 1);
        } else {
                EFX_POPULATE_OWORD_7(glb_ctl_reg_ker,
                                     /* exclude PHY from "invisible" reset */
                                     FRF_AB_EXT_PHY_RST_CTL,
                                     method == RESET_TYPE_INVISIBLE,
                                     /* exclude EEPROM/flash and PCIe */
                                     FRF_AB_PCIE_CORE_RST_CTL, 1,
                                     FRF_AB_PCIE_NSTKY_RST_CTL, 1,
                                     FRF_AB_PCIE_SD_RST_CTL, 1,
                                     FRF_AB_EE_RST_CTL, 1,
                                     FRF_AB_EXT_PHY_RST_DUR,
                                     FFE_AB_EXT_PHY_RST_DUR_10240US,
                                     FRF_AB_SWRST, 1);
        }
        efx_writeo(efx, &glb_ctl_reg_ker, FR_AB_GLB_CTL);

        netif_dbg(efx, hw, efx->net_dev, "waiting for hardware reset\n");
        schedule_timeout_uninterruptible(HZ / 20);

        /* Restore PCI configuration if needed */
        if (method == RESET_TYPE_WORLD) {
                if (efx_nic_is_dual_func(efx))
                        pci_restore_state(nic_data->pci_dev2);
                pci_restore_state(efx->pci_dev);
                netif_dbg(efx, drv, efx->net_dev,
                          "successfully restored PCI config\n");
        }

        /* Assert that reset complete */
        efx_reado(efx, &glb_ctl_reg_ker, FR_AB_GLB_CTL);
        if (EFX_OWORD_FIELD(glb_ctl_reg_ker, FRF_AB_SWRST) != 0) {
                rc = -ETIMEDOUT;
                netif_err(efx, hw, efx->net_dev,
                          "timed out waiting for hardware reset\n");
                goto fail3;
        }
        netif_dbg(efx, hw, efx->net_dev, "hardware reset complete\n");

        return 0;

        /* pci_save_state() and pci_restore_state() MUST be called in pairs */
fail2:
        pci_restore_state(efx->pci_dev);
fail1:
fail3:
        return rc;
}

static int falcon_reset_hw(struct efx_nic *efx, enum reset_type method)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        int rc;

        mutex_lock(&nic_data->spi_lock);
        rc = __falcon_reset_hw(efx, method);
        mutex_unlock(&nic_data->spi_lock);

        return rc;
}

static void falcon_monitor(struct efx_nic *efx)
{
        bool link_changed;
        int rc;

        BUG_ON(!mutex_is_locked(&efx->mac_lock));

        rc = falcon_board(efx)->type->monitor(efx);
        if (rc) {
                netif_err(efx, hw, efx->net_dev,
                          "Board sensor %s; shutting down PHY\n",
                          (rc == -ERANGE) ? "reported fault" : "failed");
                efx->phy_mode |= PHY_MODE_LOW_POWER;
                rc = __efx_reconfigure_port(efx);
                WARN_ON(rc);
        }

        if (LOOPBACK_INTERNAL(efx))
                link_changed = falcon_loopback_link_poll(efx);
        else
                link_changed = efx->phy_op->poll(efx);

        if (link_changed) {
                falcon_stop_nic_stats(efx);
                falcon_deconfigure_mac_wrapper(efx);

                falcon_reset_macs(efx);
                rc = falcon_reconfigure_xmac(efx);
                BUG_ON(rc);

                falcon_start_nic_stats(efx);

                efx_link_status_changed(efx);
        }

        falcon_poll_xmac(efx);
}

/* Zeroes out the SRAM contents.  This routine must be called in
 * process context and is allowed to sleep.
 */
static int falcon_reset_sram(struct efx_nic *efx)
{
        efx_oword_t srm_cfg_reg_ker, gpio_cfg_reg_ker;
        int count;

        /* Set the SRAM wake/sleep GPIO appropriately. */
        efx_reado(efx, &gpio_cfg_reg_ker, FR_AB_GPIO_CTL);
        EFX_SET_OWORD_FIELD(gpio_cfg_reg_ker, FRF_AB_GPIO1_OEN, 1);
        EFX_SET_OWORD_FIELD(gpio_cfg_reg_ker, FRF_AB_GPIO1_OUT, 1);
        efx_writeo(efx, &gpio_cfg_reg_ker, FR_AB_GPIO_CTL);

        /* Initiate SRAM reset */
        EFX_POPULATE_OWORD_2(srm_cfg_reg_ker,
                             FRF_AZ_SRM_INIT_EN, 1,
                             FRF_AZ_SRM_NB_SZ, 0);
        efx_writeo(efx, &srm_cfg_reg_ker, FR_AZ_SRM_CFG);

        /* Wait for SRAM reset to complete */
        count = 0;
        do {
                netif_dbg(efx, hw, efx->net_dev,
                          "waiting for SRAM reset (attempt %d)...\n", count);

                /* SRAM reset is slow; expect around 16ms */
                schedule_timeout_uninterruptible(HZ / 50);

                /* Check for reset complete */
                efx_reado(efx, &srm_cfg_reg_ker, FR_AZ_SRM_CFG);
                if (!EFX_OWORD_FIELD(srm_cfg_reg_ker, FRF_AZ_SRM_INIT_EN)) {
                        netif_dbg(efx, hw, efx->net_dev,
                                  "SRAM reset complete\n");

                        return 0;
                }
        } while (++count < 20); /* wait up to 0.4 sec */

        netif_err(efx, hw, efx->net_dev, "timed out waiting for SRAM reset\n");
        return -ETIMEDOUT;
}

static void falcon_spi_device_init(struct efx_nic *efx,
                                  struct falcon_spi_device *spi_device,
                                  unsigned int device_id, u32 device_type)
{
        if (device_type != 0) {
                spi_device->device_id = device_id;
                spi_device->size =
                        1 << SPI_DEV_TYPE_FIELD(device_type, SPI_DEV_TYPE_SIZE);
                spi_device->addr_len =
                        SPI_DEV_TYPE_FIELD(device_type, SPI_DEV_TYPE_ADDR_LEN);
                spi_device->munge_address = (spi_device->size == 1 << 9 &&
                                             spi_device->addr_len == 1);
                spi_device->erase_command =
                        SPI_DEV_TYPE_FIELD(device_type, SPI_DEV_TYPE_ERASE_CMD);
                spi_device->erase_size =
                        1 << SPI_DEV_TYPE_FIELD(device_type,
                                                SPI_DEV_TYPE_ERASE_SIZE);
                spi_device->block_size =
                        1 << SPI_DEV_TYPE_FIELD(device_type,
                                                SPI_DEV_TYPE_BLOCK_SIZE);
        } else {
                spi_device->size = 0;
        }
}

/* Extract non-volatile configuration */
static int falcon_probe_nvconfig(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        struct falcon_nvconfig *nvconfig;
        int rc;

        nvconfig = kmalloc(sizeof(*nvconfig), GFP_KERNEL);
        if (!nvconfig)
                return -ENOMEM;

        rc = falcon_read_nvram(efx, nvconfig);
        if (rc)
                goto out;

        efx->phy_type = nvconfig->board_v2.port0_phy_type;
        efx->mdio.prtad = nvconfig->board_v2.port0_phy_addr;

        if (le16_to_cpu(nvconfig->board_struct_ver) >= 3) {
                falcon_spi_device_init(
                        efx, &nic_data->spi_flash, FFE_AB_SPI_DEVICE_FLASH,
                        le32_to_cpu(nvconfig->board_v3
                                    .spi_device_type[FFE_AB_SPI_DEVICE_FLASH]));
                falcon_spi_device_init(
                        efx, &nic_data->spi_eeprom, FFE_AB_SPI_DEVICE_EEPROM,
                        le32_to_cpu(nvconfig->board_v3
                                    .spi_device_type[FFE_AB_SPI_DEVICE_EEPROM]));
        }

        /* Read the MAC addresses */
        ether_addr_copy(efx->net_dev->perm_addr, nvconfig->mac_address[0]);

        netif_dbg(efx, probe, efx->net_dev, "PHY is %d phy_id %d\n",
                  efx->phy_type, efx->mdio.prtad);

        rc = falcon_probe_board(efx,
                                le16_to_cpu(nvconfig->board_v2.board_revision));
out:
        kfree(nvconfig);
        return rc;
}

static int falcon_dimension_resources(struct efx_nic *efx)
{
        efx->rx_dc_base = 0x20000;
        efx->tx_dc_base = 0x26000;
        return 0;
}

/* Probe all SPI devices on the NIC */
static void falcon_probe_spi_devices(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        efx_oword_t nic_stat, gpio_ctl, ee_vpd_cfg;
        int boot_dev;

        efx_reado(efx, &gpio_ctl, FR_AB_GPIO_CTL);
        efx_reado(efx, &nic_stat, FR_AB_NIC_STAT);
        efx_reado(efx, &ee_vpd_cfg, FR_AB_EE_VPD_CFG0);

        if (EFX_OWORD_FIELD(gpio_ctl, FRF_AB_GPIO3_PWRUP_VALUE)) {
                boot_dev = (EFX_OWORD_FIELD(nic_stat, FRF_AB_SF_PRST) ?
                            FFE_AB_SPI_DEVICE_FLASH : FFE_AB_SPI_DEVICE_EEPROM);
                netif_dbg(efx, probe, efx->net_dev, "Booted from %s\n",
                          boot_dev == FFE_AB_SPI_DEVICE_FLASH ?
                          "flash" : "EEPROM");
        } else {
                /* Disable VPD and set clock dividers to safe
                 * values for initial programming. */
                boot_dev = -1;
                netif_dbg(efx, probe, efx->net_dev,
                          "Booted from internal ASIC settings;"
                          " setting SPI config\n");
                EFX_POPULATE_OWORD_3(ee_vpd_cfg, FRF_AB_EE_VPD_EN, 0,
                                     /* 125 MHz / 7 ~= 20 MHz */
                                     FRF_AB_EE_SF_CLOCK_DIV, 7,
                                     /* 125 MHz / 63 ~= 2 MHz */
                                     FRF_AB_EE_EE_CLOCK_DIV, 63);
                efx_writeo(efx, &ee_vpd_cfg, FR_AB_EE_VPD_CFG0);
        }

        mutex_init(&nic_data->spi_lock);

        if (boot_dev == FFE_AB_SPI_DEVICE_FLASH)
                falcon_spi_device_init(efx, &nic_data->spi_flash,
                                       FFE_AB_SPI_DEVICE_FLASH,
                                       default_flash_type);
        if (boot_dev == FFE_AB_SPI_DEVICE_EEPROM)
                falcon_spi_device_init(efx, &nic_data->spi_eeprom,
                                       FFE_AB_SPI_DEVICE_EEPROM,
                                       large_eeprom_type);
}

static unsigned int falcon_a1_mem_map_size(struct efx_nic *efx)
{
        return 0x20000;
}

static unsigned int falcon_b0_mem_map_size(struct efx_nic *efx)
{
        /* Map everything up to and including the RSS indirection table.
         * The PCI core takes care of mapping the MSI-X tables.
         */
        return FR_BZ_RX_INDIRECTION_TBL +
                FR_BZ_RX_INDIRECTION_TBL_STEP * FR_BZ_RX_INDIRECTION_TBL_ROWS;
}

static int falcon_probe_nic(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data;
        struct falcon_board *board;
        int rc;

        efx->primary = efx; /* only one usable function per controller */

        /* Allocate storage for hardware specific data */
        nic_data = kzalloc(sizeof(*nic_data), GFP_KERNEL);
        if (!nic_data)
                return -ENOMEM;
        efx->nic_data = nic_data;

        rc = -ENODEV;

        if (efx_farch_fpga_ver(efx) != 0) {
                netif_err(efx, probe, efx->net_dev,
                          "Falcon FPGA not supported\n");
                goto fail1;
        }

        if (efx_nic_rev(efx) <= EFX_REV_FALCON_A1) {
                efx_oword_t nic_stat;
                struct pci_dev *dev;
                u8 pci_rev = efx->pci_dev->revision;

                if ((pci_rev == 0xff) || (pci_rev == 0)) {
                        netif_err(efx, probe, efx->net_dev,
                                  "Falcon rev A0 not supported\n");
                        goto fail1;
                }
                efx_reado(efx, &nic_stat, FR_AB_NIC_STAT);
                if (EFX_OWORD_FIELD(nic_stat, FRF_AB_STRAP_10G) == 0) {
                        netif_err(efx, probe, efx->net_dev,
                                  "Falcon rev A1 1G not supported\n");
                        goto fail1;
                }
                if (EFX_OWORD_FIELD(nic_stat, FRF_AA_STRAP_PCIE) == 0) {
                        netif_err(efx, probe, efx->net_dev,
                                  "Falcon rev A1 PCI-X not supported\n");
                        goto fail1;
                }

                dev = pci_dev_get(efx->pci_dev);
                while ((dev = pci_get_device(PCI_VENDOR_ID_SOLARFLARE,
                                             PCI_DEVICE_ID_SOLARFLARE_SFC4000A_1,
                                             dev))) {
                        if (dev->bus == efx->pci_dev->bus &&
                            dev->devfn == efx->pci_dev->devfn + 1) {
                                nic_data->pci_dev2 = dev;
                                break;
                        }
                }
                if (!nic_data->pci_dev2) {
                        netif_err(efx, probe, efx->net_dev,
                                  "failed to find secondary function\n");
                        rc = -ENODEV;
                        goto fail2;
                }
        }

        /* Now we can reset the NIC */
        rc = __falcon_reset_hw(efx, RESET_TYPE_ALL);
        if (rc) {
                netif_err(efx, probe, efx->net_dev, "failed to reset NIC\n");
                goto fail3;
        }

        /* Allocate memory for INT_KER */
        rc = efx_nic_alloc_buffer(efx, &efx->irq_status, sizeof(efx_oword_t),
                                  GFP_KERNEL);
        if (rc)
                goto fail4;
        BUG_ON(efx->irq_status.dma_addr & 0x0f);

        netif_dbg(efx, probe, efx->net_dev,
                  "INT_KER at %llx (virt %p phys %llx)\n",
                  (u64)efx->irq_status.dma_addr,
                  efx->irq_status.addr,
                  (u64)virt_to_phys(efx->irq_status.addr));

        falcon_probe_spi_devices(efx);

        /* Read in the non-volatile configuration */
        rc = falcon_probe_nvconfig(efx);
        if (rc) {
                if (rc == -EINVAL)
                        netif_err(efx, probe, efx->net_dev, "NVRAM is invalid\n");
                goto fail5;
        }

        efx->max_channels = (efx_nic_rev(efx) <= EFX_REV_FALCON_A1 ? 4 :
                             EFX_MAX_CHANNELS);
        efx->max_tx_channels = efx->max_channels;
        efx->timer_quantum_ns = 4968; /* 621 cycles */

        /* Initialise I2C adapter */
        board = falcon_board(efx);
        board->i2c_adap.owner = THIS_MODULE;
        board->i2c_data = falcon_i2c_bit_operations;
        board->i2c_data.data = efx;
        board->i2c_adap.algo_data = &board->i2c_data;
        board->i2c_adap.dev.parent = &efx->pci_dev->dev;
        strlcpy(board->i2c_adap.name, "SFC4000 GPIO",
                sizeof(board->i2c_adap.name));
        rc = i2c_bit_add_bus(&board->i2c_adap);
        if (rc)
                goto fail5;

        rc = falcon_board(efx)->type->init(efx);
        if (rc) {
                netif_err(efx, probe, efx->net_dev,
                          "failed to initialise board\n");
                goto fail6;
        }

        nic_data->stats_disable_count = 1;
        setup_timer(&nic_data->stats_timer, &falcon_stats_timer_func,
                    (unsigned long)efx);

        return 0;

 fail6:
        i2c_del_adapter(&board->i2c_adap);
        memset(&board->i2c_adap, 0, sizeof(board->i2c_adap));
 fail5:
        efx_nic_free_buffer(efx, &efx->irq_status);
 fail4:
 fail3:
        if (nic_data->pci_dev2) {
                pci_dev_put(nic_data->pci_dev2);
                nic_data->pci_dev2 = NULL;
        }
 fail2:
 fail1:
        kfree(efx->nic_data);
        return rc;
}

static void falcon_init_rx_cfg(struct efx_nic *efx)
{
        /* RX control FIFO thresholds (32 entries) */
        const unsigned ctrl_xon_thr = 20;
        const unsigned ctrl_xoff_thr = 25;
        efx_oword_t reg;

        efx_reado(efx, &reg, FR_AZ_RX_CFG);
        if (efx_nic_rev(efx) <= EFX_REV_FALCON_A1) {
                /* Data FIFO size is 5.5K.  The RX DMA engine only
                 * supports scattering for user-mode queues, but will
                 * split DMA writes at intervals of RX_USR_BUF_SIZE
                 * (32-byte units) even for kernel-mode queues.  We
                 * set it to be so large that that never happens.
                 */
                EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_DESC_PUSH_EN, 0);
                EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_USR_BUF_SIZE,
                                    (3 * 4096) >> 5);
                EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_XON_MAC_TH, 512 >> 8);
                EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_XOFF_MAC_TH, 2048 >> 8);
                EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_XON_TX_TH, ctrl_xon_thr);
                EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_XOFF_TX_TH, ctrl_xoff_thr);
        } else {
                /* Data FIFO size is 80K; register fields moved */
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_DESC_PUSH_EN, 0);
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_USR_BUF_SIZE,
                                    EFX_RX_USR_BUF_SIZE >> 5);
                /* Send XON and XOFF at ~3 * max MTU away from empty/full */
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_XON_MAC_TH, 27648 >> 8);
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_XOFF_MAC_TH, 54272 >> 8);
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_XON_TX_TH, ctrl_xon_thr);
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_XOFF_TX_TH, ctrl_xoff_thr);
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_INGR_EN, 1);

                /* Enable hash insertion. This is broken for the
                 * 'Falcon' hash so also select Toeplitz TCP/IPv4 and
                 * IPv4 hashes. */
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_HASH_INSRT_HDR, 1);
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_HASH_ALG, 1);
                EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_IP_HASH, 1);
        }
        /* Always enable XOFF signal from RX FIFO.  We enable
         * or disable transmission of pause frames at the MAC. */
        EFX_SET_OWORD_FIELD(reg, FRF_AZ_RX_XOFF_MAC_EN, 1);
        efx_writeo(efx, &reg, FR_AZ_RX_CFG);
}

/* This call performs hardware-specific global initialisation, such as
 * defining the descriptor cache sizes and number of RSS channels.
 * It does not set up any buffers, descriptor rings or event queues.
 */
static int falcon_init_nic(struct efx_nic *efx)
{
        efx_oword_t temp;
        int rc;

        /* Use on-chip SRAM */
        efx_reado(efx, &temp, FR_AB_NIC_STAT);
        EFX_SET_OWORD_FIELD(temp, FRF_AB_ONCHIP_SRAM, 1);
        efx_writeo(efx, &temp, FR_AB_NIC_STAT);

        rc = falcon_reset_sram(efx);
        if (rc)
                return rc;

        /* Clear the parity enables on the TX data fifos as
         * they produce false parity errors because of timing issues
         */
        if (EFX_WORKAROUND_5129(efx)) {
                efx_reado(efx, &temp, FR_AZ_CSR_SPARE);
                EFX_SET_OWORD_FIELD(temp, FRF_AB_MEM_PERR_EN_TX_DATA, 0);
                efx_writeo(efx, &temp, FR_AZ_CSR_SPARE);
        }

        if (EFX_WORKAROUND_7244(efx)) {
                efx_reado(efx, &temp, FR_BZ_RX_FILTER_CTL);
                EFX_SET_OWORD_FIELD(temp, FRF_BZ_UDP_FULL_SRCH_LIMIT, 8);
                EFX_SET_OWORD_FIELD(temp, FRF_BZ_UDP_WILD_SRCH_LIMIT, 8);
                EFX_SET_OWORD_FIELD(temp, FRF_BZ_TCP_FULL_SRCH_LIMIT, 8);
                EFX_SET_OWORD_FIELD(temp, FRF_BZ_TCP_WILD_SRCH_LIMIT, 8);
                efx_writeo(efx, &temp, FR_BZ_RX_FILTER_CTL);
        }

        /* XXX This is documented only for Falcon A0/A1 */
        /* Setup RX.  Wait for descriptor is broken and must
         * be disabled.  RXDP recovery shouldn't be needed, but is.
         */
        efx_reado(efx, &temp, FR_AA_RX_SELF_RST);
        EFX_SET_OWORD_FIELD(temp, FRF_AA_RX_NODESC_WAIT_DIS, 1);
        EFX_SET_OWORD_FIELD(temp, FRF_AA_RX_SELF_RST_EN, 1);
        if (EFX_WORKAROUND_5583(efx))
                EFX_SET_OWORD_FIELD(temp, FRF_AA_RX_ISCSI_DIS, 1);
        efx_writeo(efx, &temp, FR_AA_RX_SELF_RST);

        /* Do not enable TX_NO_EOP_DISC_EN, since it limits packets to 16
         * descriptors (which is bad).
         */
        efx_reado(efx, &temp, FR_AZ_TX_CFG);
        EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_NO_EOP_DISC_EN, 0);
        efx_writeo(efx, &temp, FR_AZ_TX_CFG);

        falcon_init_rx_cfg(efx);

        if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) {
                falcon_b0_rx_push_rss_config(efx, false, efx->rx_indir_table);

                /* Set destination of both TX and RX Flush events */
                EFX_POPULATE_OWORD_1(temp, FRF_BZ_FLS_EVQ_ID, 0);
                efx_writeo(efx, &temp, FR_BZ_DP_CTRL);
        }

        efx_farch_init_common(efx);

        return 0;
}

static void falcon_remove_nic(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        struct falcon_board *board = falcon_board(efx);

        board->type->fini(efx);

        /* Remove I2C adapter and clear it in preparation for a retry */
        i2c_del_adapter(&board->i2c_adap);
        memset(&board->i2c_adap, 0, sizeof(board->i2c_adap));

        efx_nic_free_buffer(efx, &efx->irq_status);

        __falcon_reset_hw(efx, RESET_TYPE_ALL);

        /* Release the second function after the reset */
        if (nic_data->pci_dev2) {
                pci_dev_put(nic_data->pci_dev2);
                nic_data->pci_dev2 = NULL;
        }

        /* Tear down the private nic state */
        kfree(efx->nic_data);
        efx->nic_data = NULL;
}

static size_t falcon_describe_nic_stats(struct efx_nic *efx, u8 *names)
{
        return efx_nic_describe_stats(falcon_stat_desc, FALCON_STAT_COUNT,
                                      falcon_stat_mask, names);
}

static size_t falcon_update_nic_stats(struct efx_nic *efx, u64 *full_stats,
                                      struct rtnl_link_stats64 *core_stats)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        u64 *stats = nic_data->stats;
        efx_oword_t cnt;

        if (!nic_data->stats_disable_count) {
                efx_reado(efx, &cnt, FR_AZ_RX_NODESC_DROP);
                stats[FALCON_STAT_rx_nodesc_drop_cnt] +=
                        EFX_OWORD_FIELD(cnt, FRF_AB_RX_NODESC_DROP_CNT);

                if (nic_data->stats_pending &&
                    FALCON_XMAC_STATS_DMA_FLAG(efx)) {
                        nic_data->stats_pending = false;
                        rmb(); /* read the done flag before the stats */
                        efx_nic_update_stats(
                                falcon_stat_desc, FALCON_STAT_COUNT,
                                falcon_stat_mask,
                                stats, efx->stats_buffer.addr, true);
                }

                /* Update derived statistic */
                efx_update_diff_stat(&stats[FALCON_STAT_rx_bad_bytes],
                                     stats[FALCON_STAT_rx_bytes] -
                                     stats[FALCON_STAT_rx_good_bytes] -
                                     stats[FALCON_STAT_rx_control] * 64);
                efx_update_sw_stats(efx, stats);
        }

        if (full_stats)
                memcpy(full_stats, stats, sizeof(u64) * FALCON_STAT_COUNT);

        if (core_stats) {
                core_stats->rx_packets = stats[FALCON_STAT_rx_packets];
                core_stats->tx_packets = stats[FALCON_STAT_tx_packets];
                core_stats->rx_bytes = stats[FALCON_STAT_rx_bytes];
                core_stats->tx_bytes = stats[FALCON_STAT_tx_bytes];
                core_stats->rx_dropped = stats[FALCON_STAT_rx_nodesc_drop_cnt] +
                                         stats[GENERIC_STAT_rx_nodesc_trunc] +
                                         stats[GENERIC_STAT_rx_noskb_drops];
                core_stats->multicast = stats[FALCON_STAT_rx_multicast];
                core_stats->rx_length_errors =
                        stats[FALCON_STAT_rx_gtjumbo] +
                        stats[FALCON_STAT_rx_length_error];
                core_stats->rx_crc_errors = stats[FALCON_STAT_rx_bad];
                core_stats->rx_frame_errors = stats[FALCON_STAT_rx_align_error];
                core_stats->rx_fifo_errors = stats[FALCON_STAT_rx_overflow];

                core_stats->rx_errors = (core_stats->rx_length_errors +
                                         core_stats->rx_crc_errors +
                                         core_stats->rx_frame_errors +
                                         stats[FALCON_STAT_rx_symbol_error]);
        }

        return FALCON_STAT_COUNT;
}

void falcon_start_nic_stats(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;

        spin_lock_bh(&efx->stats_lock);
        if (--nic_data->stats_disable_count == 0)
                falcon_stats_request(efx);
        spin_unlock_bh(&efx->stats_lock);
}

/* We don't acutally pull stats on falcon. Wait 10ms so that
 * they arrive when we call this just after start_stats
 */
static void falcon_pull_nic_stats(struct efx_nic *efx)
{
        msleep(10);
}

void falcon_stop_nic_stats(struct efx_nic *efx)
{
        struct falcon_nic_data *nic_data = efx->nic_data;
        int i;

        might_sleep();

        spin_lock_bh(&efx->stats_lock);
        ++nic_data->stats_disable_count;
        spin_unlock_bh(&efx->stats_lock);

        del_timer_sync(&nic_data->stats_timer);

        /* Wait enough time for the most recent transfer to
         * complete. */
        for (i = 0; i < 4 && nic_data->stats_pending; i++) {
                if (FALCON_XMAC_STATS_DMA_FLAG(efx))
                        break;
                msleep(1);
        }

        spin_lock_bh(&efx->stats_lock);
        falcon_stats_complete(efx);
        spin_unlock_bh(&efx->stats_lock);
}

static void falcon_set_id_led(struct efx_nic *efx, enum efx_led_mode mode)
{
        falcon_board(efx)->type->set_id_led(efx, mode);
}

/**************************************************************************
 *
 * Wake on LAN
 *
 **************************************************************************
 */

static void falcon_get_wol(struct efx_nic *efx, struct ethtool_wolinfo *wol)
{
        wol->supported = 0;
        wol->wolopts = 0;
        memset(&wol->sopass, 0, sizeof(wol->sopass));
}

static int falcon_set_wol(struct efx_nic *efx, u32 type)
{
        if (type != 0)
                return -EINVAL;
        return 0;
}

/**************************************************************************
 *
 * Revision-dependent attributes used by efx.c and nic.c
 *
 **************************************************************************
 */

const struct efx_nic_type falcon_a1_nic_type = {
        .is_vf = false,
        .mem_bar = EFX_MEM_BAR,
        .mem_map_size = falcon_a1_mem_map_size,
        .probe = falcon_probe_nic,
        .remove = falcon_remove_nic,
        .init = falcon_init_nic,
        .dimension_resources = falcon_dimension_resources,
        .fini = falcon_irq_ack_a1,
        .monitor = falcon_monitor,
        .map_reset_reason = falcon_map_reset_reason,
        .map_reset_flags = falcon_map_reset_flags,
        .reset = falcon_reset_hw,
        .probe_port = falcon_probe_port,
        .remove_port = falcon_remove_port,
        .handle_global_event = falcon_handle_global_event,
        .fini_dmaq = efx_farch_fini_dmaq,
        .prepare_flush = falcon_prepare_flush,
        .finish_flush = efx_port_dummy_op_void,
        .prepare_flr = efx_port_dummy_op_void,
        .finish_flr = efx_farch_finish_flr,
        .describe_stats = falcon_describe_nic_stats,
        .update_stats = falcon_update_nic_stats,
        .start_stats = falcon_start_nic_stats,
        .pull_stats = falcon_pull_nic_stats,
        .stop_stats = falcon_stop_nic_stats,
        .set_id_led = falcon_set_id_led,
        .push_irq_moderation = falcon_push_irq_moderation,
        .reconfigure_port = falcon_reconfigure_port,
        .prepare_enable_fc_tx = falcon_a1_prepare_enable_fc_tx,
        .reconfigure_mac = falcon_reconfigure_xmac,
        .check_mac_fault = falcon_xmac_check_fault,
        .get_wol = falcon_get_wol,
        .set_wol = falcon_set_wol,
        .resume_wol = efx_port_dummy_op_void,
        .test_nvram = falcon_test_nvram,
        .irq_enable_master = efx_farch_irq_enable_master,
        .irq_test_generate = efx_farch_irq_test_generate,
        .irq_disable_non_ev = efx_farch_irq_disable_master,
        .irq_handle_msi = efx_farch_msi_interrupt,
        .irq_handle_legacy = falcon_legacy_interrupt_a1,
        .tx_probe = efx_farch_tx_probe,
        .tx_init = efx_farch_tx_init,
        .tx_remove = efx_farch_tx_remove,
        .tx_write = efx_farch_tx_write,
        .rx_push_rss_config = dummy_rx_push_rss_config,
        .rx_probe = efx_farch_rx_probe,
        .rx_init = efx_farch_rx_init,
        .rx_remove = efx_farch_rx_remove,
        .rx_write = efx_farch_rx_write,
        .rx_defer_refill = efx_farch_rx_defer_refill,
        .ev_probe = efx_farch_ev_probe,
        .ev_init = efx_farch_ev_init,
        .ev_fini = efx_farch_ev_fini,
        .ev_remove = efx_farch_ev_remove,
        .ev_process = efx_farch_ev_process,
        .ev_read_ack = efx_farch_ev_read_ack,
        .ev_test_generate = efx_farch_ev_test_generate,

        /* We don't expose the filter table on Falcon A1 as it is not
         * mapped into function 0, but these implementations still
         * work with a degenerate case of all tables set to size 0.
         */
        .filter_table_probe = efx_farch_filter_table_probe,
        .filter_table_restore = efx_farch_filter_table_restore,
        .filter_table_remove = efx_farch_filter_table_remove,
        .filter_insert = efx_farch_filter_insert,
        .filter_remove_safe = efx_farch_filter_remove_safe,
        .filter_get_safe = efx_farch_filter_get_safe,
        .filter_clear_rx = efx_farch_filter_clear_rx,
        .filter_count_rx_used = efx_farch_filter_count_rx_used,
        .filter_get_rx_id_limit = efx_farch_filter_get_rx_id_limit,
        .filter_get_rx_ids = efx_farch_filter_get_rx_ids,

#ifdef CONFIG_SFC_MTD
        .mtd_probe = falcon_mtd_probe,
        .mtd_rename = falcon_mtd_rename,
        .mtd_read = falcon_mtd_read,
        .mtd_erase = falcon_mtd_erase,
        .mtd_write = falcon_mtd_write,
        .mtd_sync = falcon_mtd_sync,
#endif

        .revision = EFX_REV_FALCON_A1,
        .txd_ptr_tbl_base = FR_AA_TX_DESC_PTR_TBL_KER,
        .rxd_ptr_tbl_base = FR_AA_RX_DESC_PTR_TBL_KER,
        .buf_tbl_base = FR_AA_BUF_FULL_TBL_KER,
        .evq_ptr_tbl_base = FR_AA_EVQ_PTR_TBL_KER,
        .evq_rptr_tbl_base = FR_AA_EVQ_RPTR_KER,
        .max_dma_mask = DMA_BIT_MASK(FSF_AZ_TX_KER_BUF_ADDR_WIDTH),
        .rx_buffer_padding = 0x24,
        .can_rx_scatter = false,
        .max_interrupt_mode = EFX_INT_MODE_MSI,
        .timer_period_max =  1 << FRF_AB_TC_TIMER_VAL_WIDTH,
        .offload_features = NETIF_F_IP_CSUM,
        .mcdi_max_ver = -1,
};

const struct efx_nic_type falcon_b0_nic_type = {
        .is_vf = false,
        .mem_bar = EFX_MEM_BAR,
        .mem_map_size = falcon_b0_mem_map_size,
        .probe = falcon_probe_nic,
        .remove = falcon_remove_nic,
        .init = falcon_init_nic,
        .dimension_resources = falcon_dimension_resources,
        .fini = efx_port_dummy_op_void,
        .monitor = falcon_monitor,
        .map_reset_reason = falcon_map_reset_reason,
        .map_reset_flags = falcon_map_reset_flags,
        .reset = falcon_reset_hw,
        .probe_port = falcon_probe_port,
        .remove_port = falcon_remove_port,
        .handle_global_event = falcon_handle_global_event,
        .fini_dmaq = efx_farch_fini_dmaq,
        .prepare_flush = falcon_prepare_flush,
        .finish_flush = efx_port_dummy_op_void,
        .prepare_flr = efx_port_dummy_op_void,
        .finish_flr = efx_farch_finish_flr,
        .describe_stats = falcon_describe_nic_stats,
        .update_stats = falcon_update_nic_stats,
        .start_stats = falcon_start_nic_stats,
        .pull_stats = falcon_pull_nic_stats,
        .stop_stats = falcon_stop_nic_stats,
        .set_id_led = falcon_set_id_led,
        .push_irq_moderation = falcon_push_irq_moderation,
        .reconfigure_port = falcon_reconfigure_port,
        .prepare_enable_fc_tx = falcon_b0_prepare_enable_fc_tx,
        .reconfigure_mac = falcon_reconfigure_xmac,
        .check_mac_fault = falcon_xmac_check_fault,
        .get_wol = falcon_get_wol,
        .set_wol = falcon_set_wol,
        .resume_wol = efx_port_dummy_op_void,
        .test_chip = falcon_b0_test_chip,
        .test_nvram = falcon_test_nvram,
        .irq_enable_master = efx_farch_irq_enable_master,
        .irq_test_generate = efx_farch_irq_test_generate,
        .irq_disable_non_ev = efx_farch_irq_disable_master,
        .irq_handle_msi = efx_farch_msi_interrupt,
        .irq_handle_legacy = efx_farch_legacy_interrupt,
        .tx_probe = efx_farch_tx_probe,
        .tx_init = efx_farch_tx_init,
        .tx_remove = efx_farch_tx_remove,
        .tx_write = efx_farch_tx_write,
        .rx_push_rss_config = falcon_b0_rx_push_rss_config,
        .rx_probe = efx_farch_rx_probe,
        .rx_init = efx_farch_rx_init,
        .rx_remove = efx_farch_rx_remove,
        .rx_write = efx_farch_rx_write,
        .rx_defer_refill = efx_farch_rx_defer_refill,
        .ev_probe = efx_farch_ev_probe,
        .ev_init = efx_farch_ev_init,
        .ev_fini = efx_farch_ev_fini,
        .ev_remove = efx_farch_ev_remove,
        .ev_process = efx_farch_ev_process,
        .ev_read_ack = efx_farch_ev_read_ack,
        .ev_test_generate = efx_farch_ev_test_generate,
        .filter_table_probe = efx_farch_filter_table_probe,
        .filter_table_restore = efx_farch_filter_table_restore,
        .filter_table_remove = efx_farch_filter_table_remove,
        .filter_update_rx_scatter = efx_farch_filter_update_rx_scatter,
        .filter_insert = efx_farch_filter_insert,
        .filter_remove_safe = efx_farch_filter_remove_safe,
        .filter_get_safe = efx_farch_filter_get_safe,
        .filter_clear_rx = efx_farch_filter_clear_rx,
        .filter_count_rx_used = efx_farch_filter_count_rx_used,
        .filter_get_rx_id_limit = efx_farch_filter_get_rx_id_limit,
        .filter_get_rx_ids = efx_farch_filter_get_rx_ids,
#ifdef CONFIG_RFS_ACCEL
        .filter_rfs_insert = efx_farch_filter_rfs_insert,
        .filter_rfs_expire_one = efx_farch_filter_rfs_expire_one,
#endif
#ifdef CONFIG_SFC_MTD
        .mtd_probe = falcon_mtd_probe,
        .mtd_rename = falcon_mtd_rename,
        .mtd_read = falcon_mtd_read,
        .mtd_erase = falcon_mtd_erase,
        .mtd_write = falcon_mtd_write,
        .mtd_sync = falcon_mtd_sync,
#endif

        .revision = EFX_REV_FALCON_B0,
        .txd_ptr_tbl_base = FR_BZ_TX_DESC_PTR_TBL,
        .rxd_ptr_tbl_base = FR_BZ_RX_DESC_PTR_TBL,
        .buf_tbl_base = FR_BZ_BUF_FULL_TBL,
        .evq_ptr_tbl_base = FR_BZ_EVQ_PTR_TBL,
        .evq_rptr_tbl_base = FR_BZ_EVQ_RPTR,
        .max_dma_mask = DMA_BIT_MASK(FSF_AZ_TX_KER_BUF_ADDR_WIDTH),
        .rx_prefix_size = FS_BZ_RX_PREFIX_SIZE,
        .rx_hash_offset = FS_BZ_RX_PREFIX_HASH_OFST,
        .rx_buffer_padding = 0,
        .can_rx_scatter = true,
        .max_interrupt_mode = EFX_INT_MODE_MSIX,
        .timer_period_max =  1 << FRF_AB_TC_TIMER_VAL_WIDTH,
        .offload_features = NETIF_F_IP_CSUM | NETIF_F_RXHASH | NETIF_F_NTUPLE,
        .mcdi_max_ver = -1,
        .max_rx_ip_filters = FR_BZ_RX_FILTER_TBL0_ROWS,
};