linux-stable/drivers/net/sfc/falcon.c

/****************************************************************************
 * Driver for Solarflare Solarstorm network controllers and boards
 * Copyright 2005-2006 Fen Systems Ltd.
 * Copyright 2006-2008 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 "net_driver.h"
#include "bitfield.h"
#include "efx.h"
#include "mac.h"
#include "spi.h"
#include "falcon.h"
#include "regs.h"
#include "io.h"
#include "mdio_10g.h"
#include "phy.h"
#include "workarounds.h"

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

/**************************************************************************
 *
 * Configurable values
 *
 **************************************************************************
 */

/* This is set to 16 for a good reason.  In summary, if larger than
 * 16, the descriptor cache holds more than a default socket
 * buffer's worth of packets (for UDP we can only have at most one
 * socket buffer's worth outstanding).  This combined with the fact
 * that we only get 1 TX event per descriptor cache means the NIC
 * goes idle.
 */
#define TX_DC_ENTRIES 16
#define TX_DC_ENTRIES_ORDER 1
#define TX_DC_BASE 0x130000

#define RX_DC_ENTRIES 64
#define RX_DC_ENTRIES_ORDER 3
#define RX_DC_BASE 0x100000

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));

/* RX FIFO XOFF watermark
 *
 * When the amount of the RX FIFO increases used increases past this
 * watermark send XOFF. Only used if RX flow control is enabled (ethtool -A)
 * This also has an effect on RX/TX arbitration
 */
static int rx_xoff_thresh_bytes = -1;
module_param(rx_xoff_thresh_bytes, int, 0644);
MODULE_PARM_DESC(rx_xoff_thresh_bytes, "RX fifo XOFF threshold");

/* RX FIFO XON watermark
 *
 * When the amount of the RX FIFO used decreases below this
 * watermark send XON. Only used if TX flow control is enabled (ethtool -A)
 * This also has an effect on RX/TX arbitration
 */
static int rx_xon_thresh_bytes = -1;
module_param(rx_xon_thresh_bytes, int, 0644);
MODULE_PARM_DESC(rx_xon_thresh_bytes, "RX fifo XON threshold");

/* If FALCON_MAX_INT_ERRORS internal errors occur within
 * FALCON_INT_ERROR_EXPIRE seconds, we consider the NIC broken and
 * disable it.
 */
#define FALCON_INT_ERROR_EXPIRE 3600
#define FALCON_MAX_INT_ERRORS 5

/* We poll for events every FLUSH_INTERVAL ms, and check FLUSH_POLL_COUNT times
 */
#define FALCON_FLUSH_INTERVAL 10
#define FALCON_FLUSH_POLL_COUNT 100

/**************************************************************************
 *
 * Falcon constants
 *
 **************************************************************************
 */

/* Size and alignment of special buffers (4KB) */
#define FALCON_BUF_SIZE 4096

/* Depth of RX flush request fifo */
#define FALCON_RX_FLUSH_COUNT 4

#define FALCON_IS_DUAL_FUNC(efx)		\
	(falcon_rev(efx) < FALCON_REV_B0)

/**************************************************************************
 *
 * Falcon hardware access
 *
 **************************************************************************/

static inline void falcon_write_buf_tbl(struct efx_nic *efx, efx_qword_t *value,
					unsigned int index)
{
	efx_sram_writeq(efx, efx->membase + efx->type->buf_tbl_base,
			value, index);
}

/* Read the current event from the event queue */
static inline efx_qword_t *falcon_event(struct efx_channel *channel,
					unsigned int index)
{
	return (((efx_qword_t *) (channel->eventq.addr)) + index);
}

/* See if an event is present
 *
 * We check both the high and low dword of the event for all ones.  We
 * wrote all ones when we cleared the event, and no valid event can
 * have all ones in either its high or low dwords.  This approach is
 * robust against reordering.
 *
 * Note that using a single 64-bit comparison is incorrect; even
 * though the CPU read will be atomic, the DMA write may not be.
 */
static inline int falcon_event_present(efx_qword_t *event)
{
	return (!(EFX_DWORD_IS_ALL_ONES(event->dword[0]) |
		  EFX_DWORD_IS_ALL_ONES(event->dword[1])));
}

/**************************************************************************
 *
 * 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 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),
};

/**************************************************************************
 *
 * Falcon special buffer handling
 * Special buffers are used for event queues and the TX and RX
 * descriptor rings.
 *
 *************************************************************************/

/*
 * Initialise a Falcon special buffer
 *
 * This will define a buffer (previously allocated via
 * falcon_alloc_special_buffer()) in Falcon's buffer table, allowing
 * it to be used for event queues, descriptor rings etc.
 */
static void
falcon_init_special_buffer(struct efx_nic *efx,
			   struct efx_special_buffer *buffer)
{
	efx_qword_t buf_desc;
	int index;
	dma_addr_t dma_addr;
	int i;

	EFX_BUG_ON_PARANOID(!buffer->addr);

	/* Write buffer descriptors to NIC */
	for (i = 0; i < buffer->entries; i++) {
		index = buffer->index + i;
		dma_addr = buffer->dma_addr + (i * 4096);
		EFX_LOG(efx, "mapping special buffer %d at %llx\n",
			index, (unsigned long long)dma_addr);
		EFX_POPULATE_QWORD_3(buf_desc,
				     FRF_AZ_BUF_ADR_REGION, 0,
				     FRF_AZ_BUF_ADR_FBUF, dma_addr >> 12,
				     FRF_AZ_BUF_OWNER_ID_FBUF, 0);
		falcon_write_buf_tbl(efx, &buf_desc, index);
	}
}

/* Unmaps a buffer from Falcon and clears the buffer table entries */
static void
falcon_fini_special_buffer(struct efx_nic *efx,
			   struct efx_special_buffer *buffer)
{
	efx_oword_t buf_tbl_upd;
	unsigned int start = buffer->index;
	unsigned int end = (buffer->index + buffer->entries - 1);

	if (!buffer->entries)
		return;

	EFX_LOG(efx, "unmapping special buffers %d-%d\n",
		buffer->index, buffer->index + buffer->entries - 1);

	EFX_POPULATE_OWORD_4(buf_tbl_upd,
			     FRF_AZ_BUF_UPD_CMD, 0,
			     FRF_AZ_BUF_CLR_CMD, 1,
			     FRF_AZ_BUF_CLR_END_ID, end,
			     FRF_AZ_BUF_CLR_START_ID, start);
	efx_writeo(efx, &buf_tbl_upd, FR_AZ_BUF_TBL_UPD);
}

/*
 * Allocate a new Falcon special buffer
 *
 * This allocates memory for a new buffer, clears it and allocates a
 * new buffer ID range.  It does not write into Falcon's buffer table.
 *
 * This call will allocate 4KB buffers, since Falcon can't use 8KB
 * buffers for event queues and descriptor rings.
 */
static int falcon_alloc_special_buffer(struct efx_nic *efx,
				       struct efx_special_buffer *buffer,
				       unsigned int len)
{
	len = ALIGN(len, FALCON_BUF_SIZE);

	buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
					    &buffer->dma_addr);
	if (!buffer->addr)
		return -ENOMEM;
	buffer->len = len;
	buffer->entries = len / FALCON_BUF_SIZE;
	BUG_ON(buffer->dma_addr & (FALCON_BUF_SIZE - 1));

	/* All zeros is a potentially valid event so memset to 0xff */
	memset(buffer->addr, 0xff, len);

	/* Select new buffer ID */
	buffer->index = efx->next_buffer_table;
	efx->next_buffer_table += buffer->entries;

	EFX_LOG(efx, "allocating special buffers %d-%d at %llx+%x "
		"(virt %p phys %llx)\n", buffer->index,
		buffer->index + buffer->entries - 1,
		(u64)buffer->dma_addr, len,
		buffer->addr, (u64)virt_to_phys(buffer->addr));

	return 0;
}

static void falcon_free_special_buffer(struct efx_nic *efx,
				       struct efx_special_buffer *buffer)
{
	if (!buffer->addr)
		return;

	EFX_LOG(efx, "deallocating special buffers %d-%d at %llx+%x "
		"(virt %p phys %llx)\n", buffer->index,
		buffer->index + buffer->entries - 1,
		(u64)buffer->dma_addr, buffer->len,
		buffer->addr, (u64)virt_to_phys(buffer->addr));

	pci_free_consistent(efx->pci_dev, buffer->len, buffer->addr,
			    buffer->dma_addr);
	buffer->addr = NULL;
	buffer->entries = 0;
}

/**************************************************************************
 *
 * Falcon generic buffer handling
 * These buffers are used for interrupt status and MAC stats
 *
 **************************************************************************/

static int falcon_alloc_buffer(struct efx_nic *efx,
			       struct efx_buffer *buffer, unsigned int len)
{
	buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
					    &buffer->dma_addr);
	if (!buffer->addr)
		return -ENOMEM;
	buffer->len = len;
	memset(buffer->addr, 0, len);
	return 0;
}

static void falcon_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer)
{
	if (buffer->addr) {
		pci_free_consistent(efx->pci_dev, buffer->len,
				    buffer->addr, buffer->dma_addr);
		buffer->addr = NULL;
	}
}

/**************************************************************************
 *
 * Falcon TX path
 *
 **************************************************************************/

/* Returns a pointer to the specified transmit descriptor in the TX
 * descriptor queue belonging to the specified channel.
 */
static inline efx_qword_t *falcon_tx_desc(struct efx_tx_queue *tx_queue,
					       unsigned int index)
{
	return (((efx_qword_t *) (tx_queue->txd.addr)) + index);
}

/* This writes to the TX_DESC_WPTR; write pointer for TX descriptor ring */
static inline void falcon_notify_tx_desc(struct efx_tx_queue *tx_queue)
{
	unsigned write_ptr;
	efx_dword_t reg;

	write_ptr = tx_queue->write_count & EFX_TXQ_MASK;
	EFX_POPULATE_DWORD_1(reg, FRF_AZ_TX_DESC_WPTR_DWORD, write_ptr);
	efx_writed_page(tx_queue->efx, &reg,
			FR_AZ_TX_DESC_UPD_DWORD_P0, tx_queue->queue);
}


/* For each entry inserted into the software descriptor ring, create a
 * descriptor in the hardware TX descriptor ring (in host memory), and
 * write a doorbell.
 */
void falcon_push_buffers(struct efx_tx_queue *tx_queue)
{

	struct efx_tx_buffer *buffer;
	efx_qword_t *txd;
	unsigned write_ptr;

	BUG_ON(tx_queue->write_count == tx_queue->insert_count);

	do {
		write_ptr = tx_queue->write_count & EFX_TXQ_MASK;
		buffer = &tx_queue->buffer[write_ptr];
		txd = falcon_tx_desc(tx_queue, write_ptr);
		++tx_queue->write_count;

		/* Create TX descriptor ring entry */
		EFX_POPULATE_QWORD_4(*txd,
				     FSF_AZ_TX_KER_CONT, buffer->continuation,
				     FSF_AZ_TX_KER_BYTE_COUNT, buffer->len,
				     FSF_AZ_TX_KER_BUF_REGION, 0,
				     FSF_AZ_TX_KER_BUF_ADDR, buffer->dma_addr);
	} while (tx_queue->write_count != tx_queue->insert_count);

	wmb(); /* Ensure descriptors are written before they are fetched */
	falcon_notify_tx_desc(tx_queue);
}

/* Allocate hardware resources for a TX queue */
int falcon_probe_tx(struct efx_tx_queue *tx_queue)
{
	struct efx_nic *efx = tx_queue->efx;
	BUILD_BUG_ON(EFX_TXQ_SIZE < 512 || EFX_TXQ_SIZE > 4096 ||
		     EFX_TXQ_SIZE & EFX_TXQ_MASK);
	return falcon_alloc_special_buffer(efx, &tx_queue->txd,
					   EFX_TXQ_SIZE * sizeof(efx_qword_t));
}

void falcon_init_tx(struct efx_tx_queue *tx_queue)
{
	efx_oword_t tx_desc_ptr;
	struct efx_nic *efx = tx_queue->efx;

	tx_queue->flushed = FLUSH_NONE;

	/* Pin TX descriptor ring */
	falcon_init_special_buffer(efx, &tx_queue->txd);

	/* Push TX descriptor ring to card */
	EFX_POPULATE_OWORD_10(tx_desc_ptr,
			      FRF_AZ_TX_DESCQ_EN, 1,
			      FRF_AZ_TX_ISCSI_DDIG_EN, 0,
			      FRF_AZ_TX_ISCSI_HDIG_EN, 0,
			      FRF_AZ_TX_DESCQ_BUF_BASE_ID, tx_queue->txd.index,
			      FRF_AZ_TX_DESCQ_EVQ_ID,
			      tx_queue->channel->channel,
			      FRF_AZ_TX_DESCQ_OWNER_ID, 0,
			      FRF_AZ_TX_DESCQ_LABEL, tx_queue->queue,
			      FRF_AZ_TX_DESCQ_SIZE,
			      __ffs(tx_queue->txd.entries),
			      FRF_AZ_TX_DESCQ_TYPE, 0,
			      FRF_BZ_TX_NON_IP_DROP_DIS, 1);

	if (falcon_rev(efx) >= FALCON_REV_B0) {
		int csum = tx_queue->queue == EFX_TX_QUEUE_OFFLOAD_CSUM;
		EFX_SET_OWORD_FIELD(tx_desc_ptr, FRF_BZ_TX_IP_CHKSM_DIS, !csum);
		EFX_SET_OWORD_FIELD(tx_desc_ptr, FRF_BZ_TX_TCP_CHKSM_DIS,
				    !csum);
	}

	efx_writeo_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
			 tx_queue->queue);

	if (falcon_rev(efx) < FALCON_REV_B0) {
		efx_oword_t reg;

		/* Only 128 bits in this register */
		BUILD_BUG_ON(EFX_TX_QUEUE_COUNT >= 128);

		efx_reado(efx, &reg, FR_AA_TX_CHKSM_CFG);
		if (tx_queue->queue == EFX_TX_QUEUE_OFFLOAD_CSUM)
			clear_bit_le(tx_queue->queue, (void *)&reg);
		else
			set_bit_le(tx_queue->queue, (void *)&reg);
		efx_writeo(efx, &reg, FR_AA_TX_CHKSM_CFG);
	}
}

static void falcon_flush_tx_queue(struct efx_tx_queue *tx_queue)
{
	struct efx_nic *efx = tx_queue->efx;
	efx_oword_t tx_flush_descq;

	tx_queue->flushed = FLUSH_PENDING;

	/* Post a flush command */
	EFX_POPULATE_OWORD_2(tx_flush_descq,
			     FRF_AZ_TX_FLUSH_DESCQ_CMD, 1,
			     FRF_AZ_TX_FLUSH_DESCQ, tx_queue->queue);
	efx_writeo(efx, &tx_flush_descq, FR_AZ_TX_FLUSH_DESCQ);
}

void falcon_fini_tx(struct efx_tx_queue *tx_queue)
{
	struct efx_nic *efx = tx_queue->efx;
	efx_oword_t tx_desc_ptr;

	/* The queue should have been flushed */
	WARN_ON(tx_queue->flushed != FLUSH_DONE);

	/* Remove TX descriptor ring from card */
	EFX_ZERO_OWORD(tx_desc_ptr);
	efx_writeo_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base,
			 tx_queue->queue);

	/* Unpin TX descriptor ring */
	falcon_fini_special_buffer(efx, &tx_queue->txd);
}

/* Free buffers backing TX queue */
void falcon_remove_tx(struct efx_tx_queue *tx_queue)
{
	falcon_free_special_buffer(tx_queue->efx, &tx_queue->txd);
}

/**************************************************************************
 *
 * Falcon RX path
 *
 **************************************************************************/

/* Returns a pointer to the specified descriptor in the RX descriptor queue */
static inline efx_qword_t *falcon_rx_desc(struct efx_rx_queue *rx_queue,
					       unsigned int index)
{
	return (((efx_qword_t *) (rx_queue->rxd.addr)) + index);
}

/* This creates an entry in the RX descriptor queue */
static inline void falcon_build_rx_desc(struct efx_rx_queue *rx_queue,
					unsigned index)
{
	struct efx_rx_buffer *rx_buf;
	efx_qword_t *rxd;

	rxd = falcon_rx_desc(rx_queue, index);
	rx_buf = efx_rx_buffer(rx_queue, index);
	EFX_POPULATE_QWORD_3(*rxd,
			     FSF_AZ_RX_KER_BUF_SIZE,
			     rx_buf->len -
			     rx_queue->efx->type->rx_buffer_padding,
			     FSF_AZ_RX_KER_BUF_REGION, 0,
			     FSF_AZ_RX_KER_BUF_ADDR, rx_buf->dma_addr);
}

/* This writes to the RX_DESC_WPTR register for the specified receive
 * descriptor ring.
 */
void falcon_notify_rx_desc(struct efx_rx_queue *rx_queue)
{
	efx_dword_t reg;
	unsigned write_ptr;

	while (rx_queue->notified_count != rx_queue->added_count) {
		falcon_build_rx_desc(rx_queue,
				     rx_queue->notified_count &
				     EFX_RXQ_MASK);
		++rx_queue->notified_count;
	}

	wmb();
	write_ptr = rx_queue->added_count & EFX_RXQ_MASK;
	EFX_POPULATE_DWORD_1(reg, FRF_AZ_RX_DESC_WPTR_DWORD, write_ptr);
	efx_writed_page(rx_queue->efx, &reg,
			FR_AZ_RX_DESC_UPD_DWORD_P0, rx_queue->queue);
}

int falcon_probe_rx(struct efx_rx_queue *rx_queue)
{
	struct efx_nic *efx = rx_queue->efx;
	BUILD_BUG_ON(EFX_RXQ_SIZE < 512 || EFX_RXQ_SIZE > 4096 ||
		     EFX_RXQ_SIZE & EFX_RXQ_MASK);
	return falcon_alloc_special_buffer(efx, &rx_queue->rxd,
					   EFX_RXQ_SIZE * sizeof(efx_qword_t));
}

void falcon_init_rx(struct efx_rx_queue *rx_queue)
{
	efx_oword_t rx_desc_ptr;
	struct efx_nic *efx = rx_queue->efx;
	bool is_b0 = falcon_rev(efx) >= FALCON_REV_B0;
	bool iscsi_digest_en = is_b0;

	EFX_LOG(efx, "RX queue %d ring in special buffers %d-%d\n",
		rx_queue->queue, rx_queue->rxd.index,
		rx_queue->rxd.index + rx_queue->rxd.entries - 1);

	rx_queue->flushed = FLUSH_NONE;

	/* Pin RX descriptor ring */
	falcon_init_special_buffer(efx, &rx_queue->rxd);

	/* Push RX descriptor ring to card */
	EFX_POPULATE_OWORD_10(rx_desc_ptr,
			      FRF_AZ_RX_ISCSI_DDIG_EN, iscsi_digest_en,
			      FRF_AZ_RX_ISCSI_HDIG_EN, iscsi_digest_en,
			      FRF_AZ_RX_DESCQ_BUF_BASE_ID, rx_queue->rxd.index,
			      FRF_AZ_RX_DESCQ_EVQ_ID,
			      rx_queue->channel->channel,
			      FRF_AZ_RX_DESCQ_OWNER_ID, 0,
			      FRF_AZ_RX_DESCQ_LABEL, rx_queue->queue,
			      FRF_AZ_RX_DESCQ_SIZE,
			      __ffs(rx_queue->rxd.entries),
			      FRF_AZ_RX_DESCQ_TYPE, 0 /* kernel queue */ ,
			      /* For >=B0 this is scatter so disable */
			      FRF_AZ_RX_DESCQ_JUMBO, !is_b0,
			      FRF_AZ_RX_DESCQ_EN, 1);
	efx_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
			 rx_queue->queue);
}

static void falcon_flush_rx_queue(struct efx_rx_queue *rx_queue)
{
	struct efx_nic *efx = rx_queue->efx;
	efx_oword_t rx_flush_descq;

	rx_queue->flushed = FLUSH_PENDING;

	/* Post a flush command */
	EFX_POPULATE_OWORD_2(rx_flush_descq,
			     FRF_AZ_RX_FLUSH_DESCQ_CMD, 1,
			     FRF_AZ_RX_FLUSH_DESCQ, rx_queue->queue);
	efx_writeo(efx, &rx_flush_descq, FR_AZ_RX_FLUSH_DESCQ);
}

void falcon_fini_rx(struct efx_rx_queue *rx_queue)
{
	efx_oword_t rx_desc_ptr;
	struct efx_nic *efx = rx_queue->efx;

	/* The queue should already have been flushed */
	WARN_ON(rx_queue->flushed != FLUSH_DONE);

	/* Remove RX descriptor ring from card */
	EFX_ZERO_OWORD(rx_desc_ptr);
	efx_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base,
			 rx_queue->queue);

	/* Unpin RX descriptor ring */
	falcon_fini_special_buffer(efx, &rx_queue->rxd);
}

/* Free buffers backing RX queue */
void falcon_remove_rx(struct efx_rx_queue *rx_queue)
{
	falcon_free_special_buffer(rx_queue->efx, &rx_queue->rxd);
}

/**************************************************************************
 *
 * Falcon event queue processing
 * Event queues are processed by per-channel tasklets.
 *
 **************************************************************************/

/* Update a channel's event queue's read pointer (RPTR) register
 *
 * This writes the EVQ_RPTR_REG register for the specified channel's
 * event queue.
 *
 * Note that EVQ_RPTR_REG contains the index of the "last read" event,
 * whereas channel->eventq_read_ptr contains the index of the "next to
 * read" event.
 */
void falcon_eventq_read_ack(struct efx_channel *channel)
{
	efx_dword_t reg;
	struct efx_nic *efx = channel->efx;

	EFX_POPULATE_DWORD_1(reg, FRF_AZ_EVQ_RPTR, channel->eventq_read_ptr);
	efx_writed_table(efx, &reg, efx->type->evq_rptr_tbl_base,
			    channel->channel);
}

/* Use HW to insert a SW defined event */
void falcon_generate_event(struct efx_channel *channel, efx_qword_t *event)
{
	efx_oword_t drv_ev_reg;

	BUILD_BUG_ON(FRF_AZ_DRV_EV_DATA_LBN != 0 ||
		     FRF_AZ_DRV_EV_DATA_WIDTH != 64);
	drv_ev_reg.u32[0] = event->u32[0];
	drv_ev_reg.u32[1] = event->u32[1];
	drv_ev_reg.u32[2] = 0;
	drv_ev_reg.u32[3] = 0;
	EFX_SET_OWORD_FIELD(drv_ev_reg, FRF_AZ_DRV_EV_QID, channel->channel);
	efx_writeo(channel->efx, &drv_ev_reg, FR_AZ_DRV_EV);
}

/* Handle a transmit completion event
 *
 * Falcon batches TX completion events; the message we receive is of
 * the form "complete all TX events up to this index".
 */
static void falcon_handle_tx_event(struct efx_channel *channel,
				   efx_qword_t *event)
{
	unsigned int tx_ev_desc_ptr;
	unsigned int tx_ev_q_label;
	struct efx_tx_queue *tx_queue;
	struct efx_nic *efx = channel->efx;

	if (likely(EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_COMP))) {
		/* Transmit completion */
		tx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_DESC_PTR);
		tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
		tx_queue = &efx->tx_queue[tx_ev_q_label];
		channel->irq_mod_score +=
			(tx_ev_desc_ptr - tx_queue->read_count) &
			EFX_TXQ_MASK;
		efx_xmit_done(tx_queue, tx_ev_desc_ptr);
	} else if (EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_WQ_FF_FULL)) {
		/* Rewrite the FIFO write pointer */
		tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL);
		tx_queue = &efx->tx_queue[tx_ev_q_label];

		if (efx_dev_registered(efx))
			netif_tx_lock(efx->net_dev);
		falcon_notify_tx_desc(tx_queue);
		if (efx_dev_registered(efx))
			netif_tx_unlock(efx->net_dev);
	} else if (EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_PKT_ERR) &&
		   EFX_WORKAROUND_10727(efx)) {
		efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
	} else {
		EFX_ERR(efx, "channel %d unexpected TX event "
			EFX_QWORD_FMT"\n", channel->channel,
			EFX_QWORD_VAL(*event));
	}
}

/* Detect errors included in the rx_evt_pkt_ok bit. */
static void falcon_handle_rx_not_ok(struct efx_rx_queue *rx_queue,
				    const efx_qword_t *event,
				    bool *rx_ev_pkt_ok,
				    bool *discard)
{
	struct efx_nic *efx = rx_queue->efx;
	bool rx_ev_buf_owner_id_err, rx_ev_ip_hdr_chksum_err;
	bool rx_ev_tcp_udp_chksum_err, rx_ev_eth_crc_err;
	bool rx_ev_frm_trunc, rx_ev_drib_nib, rx_ev_tobe_disc;
	bool rx_ev_other_err, rx_ev_pause_frm;
	bool rx_ev_ip_frag_err, rx_ev_hdr_type, rx_ev_mcast_pkt;
	unsigned rx_ev_pkt_type;

	rx_ev_hdr_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE);
	rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT);
	rx_ev_tobe_disc = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_TOBE_DISC);
	rx_ev_pkt_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_TYPE);
	rx_ev_buf_owner_id_err = EFX_QWORD_FIELD(*event,
						 FSF_AZ_RX_EV_BUF_OWNER_ID_ERR);
	rx_ev_ip_frag_err = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_IP_FRAG_ERR);
	rx_ev_ip_hdr_chksum_err = EFX_QWORD_FIELD(*event,
						  FSF_AZ_RX_EV_IP_HDR_CHKSUM_ERR);
	rx_ev_tcp_udp_chksum_err = EFX_QWORD_FIELD(*event,
						   FSF_AZ_RX_EV_TCP_UDP_CHKSUM_ERR);
	rx_ev_eth_crc_err = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_ETH_CRC_ERR);
	rx_ev_frm_trunc = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_FRM_TRUNC);
	rx_ev_drib_nib = ((falcon_rev(efx) >= FALCON_REV_B0) ?
			  0 : EFX_QWORD_FIELD(*event, FSF_AA_RX_EV_DRIB_NIB));
	rx_ev_pause_frm = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PAUSE_FRM_ERR);

	/* Every error apart from tobe_disc and pause_frm */
	rx_ev_other_err = (rx_ev_drib_nib | rx_ev_tcp_udp_chksum_err |
			   rx_ev_buf_owner_id_err | rx_ev_eth_crc_err |
			   rx_ev_frm_trunc | rx_ev_ip_hdr_chksum_err);

	/* Count errors that are not in MAC stats.  Ignore expected
	 * checksum errors during self-test. */
	if (rx_ev_frm_trunc)
		++rx_queue->channel->n_rx_frm_trunc;
	else if (rx_ev_tobe_disc)
		++rx_queue->channel->n_rx_tobe_disc;
	else if (!efx->loopback_selftest) {
		if (rx_ev_ip_hdr_chksum_err)
			++rx_queue->channel->n_rx_ip_hdr_chksum_err;
		else if (rx_ev_tcp_udp_chksum_err)
			++rx_queue->channel->n_rx_tcp_udp_chksum_err;
	}
	if (rx_ev_ip_frag_err)
		++rx_queue->channel->n_rx_ip_frag_err;

	/* The frame must be discarded if any of these are true. */
	*discard = (rx_ev_eth_crc_err | rx_ev_frm_trunc | rx_ev_drib_nib |
		    rx_ev_tobe_disc | rx_ev_pause_frm);

	/* TOBE_DISC is expected on unicast mismatches; don't print out an
	 * error message.  FRM_TRUNC indicates RXDP dropped the packet due
	 * to a FIFO overflow.
	 */
#ifdef EFX_ENABLE_DEBUG
	if (rx_ev_other_err) {
		EFX_INFO_RL(efx, " RX queue %d unexpected RX event "
			    EFX_QWORD_FMT "%s%s%s%s%s%s%s%s\n",
			    rx_queue->queue, EFX_QWORD_VAL(*event),
			    rx_ev_buf_owner_id_err ? " [OWNER_ID_ERR]" : "",
			    rx_ev_ip_hdr_chksum_err ?
			    " [IP_HDR_CHKSUM_ERR]" : "",
			    rx_ev_tcp_udp_chksum_err ?
			    " [TCP_UDP_CHKSUM_ERR]" : "",
			    rx_ev_eth_crc_err ? " [ETH_CRC_ERR]" : "",
			    rx_ev_frm_trunc ? " [FRM_TRUNC]" : "",
			    rx_ev_drib_nib ? " [DRIB_NIB]" : "",
			    rx_ev_tobe_disc ? " [TOBE_DISC]" : "",
			    rx_ev_pause_frm ? " [PAUSE]" : "");
	}
#endif
}

/* Handle receive events that are not in-order. */
static void falcon_handle_rx_bad_index(struct efx_rx_queue *rx_queue,
				       unsigned index)
{
	struct efx_nic *efx = rx_queue->efx;
	unsigned expected, dropped;

	expected = rx_queue->removed_count & EFX_RXQ_MASK;
	dropped = (index - expected) & EFX_RXQ_MASK;
	EFX_INFO(efx, "dropped %d events (index=%d expected=%d)\n",
		dropped, index, expected);

	efx_schedule_reset(efx, EFX_WORKAROUND_5676(efx) ?
			   RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE);
}

/* Handle a packet received event
 *
 * Falcon silicon gives a "discard" flag if it's a unicast packet with the
 * wrong destination address
 * Also "is multicast" and "matches multicast filter" flags can be used to
 * discard non-matching multicast packets.
 */
static void falcon_handle_rx_event(struct efx_channel *channel,
				   const efx_qword_t *event)
{
	unsigned int rx_ev_desc_ptr, rx_ev_byte_cnt;
	unsigned int rx_ev_hdr_type, rx_ev_mcast_pkt;
	unsigned expected_ptr;
	bool rx_ev_pkt_ok, discard = false, checksummed;
	struct efx_rx_queue *rx_queue;
	struct efx_nic *efx = channel->efx;

	/* Basic packet information */
	rx_ev_byte_cnt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_BYTE_CNT);
	rx_ev_pkt_ok = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_OK);
	rx_ev_hdr_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE);
	WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_JUMBO_CONT));
	WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_SOP) != 1);
	WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_Q_LABEL) !=
		channel->channel);

	rx_queue = &efx->rx_queue[channel->channel];

	rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_DESC_PTR);
	expected_ptr = rx_queue->removed_count & EFX_RXQ_MASK;
	if (unlikely(rx_ev_desc_ptr != expected_ptr))
		falcon_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr);

	if (likely(rx_ev_pkt_ok)) {
		/* If packet is marked as OK and packet type is TCP/IPv4 or
		 * UDP/IPv4, then we can rely on the hardware checksum.
		 */
		checksummed =
			efx->rx_checksum_enabled &&
			(rx_ev_hdr_type == FSE_AB_RX_EV_HDR_TYPE_IPV4_TCP ||
			 rx_ev_hdr_type == FSE_AB_RX_EV_HDR_TYPE_IPV4_UDP);
	} else {
		falcon_handle_rx_not_ok(rx_queue, event, &rx_ev_pkt_ok,
					&discard);
		checksummed = false;
	}

	/* Detect multicast packets that didn't match the filter */
	rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT);
	if (rx_ev_mcast_pkt) {
		unsigned int rx_ev_mcast_hash_match =
			EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_HASH_MATCH);

		if (unlikely(!rx_ev_mcast_hash_match))
			discard = true;
	}

	channel->irq_mod_score += 2;

	/* Handle received packet */
	efx_rx_packet(rx_queue, rx_ev_desc_ptr, rx_ev_byte_cnt,
		      checksummed, discard);
}

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

	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)) {
		efx->phy_op->clear_interrupt(efx);
		queue_work(efx->workqueue, &efx->phy_work);
		handled = true;
	}

	if ((falcon_rev(efx) >= FALCON_REV_B0) &&
	    EFX_QWORD_FIELD(*event, FSF_BB_GLB_EV_XG_MGT_INTR)) {
		efx->xmac_poll_required = true;
		handled = true;
	}

	if (falcon_rev(efx) <= FALCON_REV_A1 ?
	    EFX_QWORD_FIELD(*event, FSF_AA_GLB_EV_RX_RECOVERY) :
	    EFX_QWORD_FIELD(*event, FSF_BB_GLB_EV_RX_RECOVERY)) {
		EFX_ERR(efx, "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);
		handled = true;
	}

	if (!handled)
		EFX_ERR(efx, "channel %d unknown global event "
			EFX_QWORD_FMT "\n", channel->channel,
			EFX_QWORD_VAL(*event));
}

static void falcon_handle_driver_event(struct efx_channel *channel,
				       efx_qword_t *event)
{
	struct efx_nic *efx = channel->efx;
	unsigned int ev_sub_code;
	unsigned int ev_sub_data;

	ev_sub_code = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBCODE);
	ev_sub_data = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA);

	switch (ev_sub_code) {
	case FSE_AZ_TX_DESCQ_FLS_DONE_EV:
		EFX_TRACE(efx, "channel %d TXQ %d flushed\n",
			  channel->channel, ev_sub_data);
		break;
	case FSE_AZ_RX_DESCQ_FLS_DONE_EV:
		EFX_TRACE(efx, "channel %d RXQ %d flushed\n",
			  channel->channel, ev_sub_data);
		break;
	case FSE_AZ_EVQ_INIT_DONE_EV:
		EFX_LOG(efx, "channel %d EVQ %d initialised\n",
			channel->channel, ev_sub_data);
		break;
	case FSE_AZ_SRM_UPD_DONE_EV:
		EFX_TRACE(efx, "channel %d SRAM update done\n",
			  channel->channel);
		break;
	case FSE_AZ_WAKE_UP_EV:
		EFX_TRACE(efx, "channel %d RXQ %d wakeup event\n",
			  channel->channel, ev_sub_data);
		break;
	case FSE_AZ_TIMER_EV:
		EFX_TRACE(efx, "channel %d RX queue %d timer expired\n",
			  channel->channel, ev_sub_data);
		break;
	case FSE_AA_RX_RECOVER_EV:
		EFX_ERR(efx, "channel %d seen DRIVER 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);
		break;
	case FSE_BZ_RX_DSC_ERROR_EV:
		EFX_ERR(efx, "RX DMA Q %d reports descriptor fetch error."
			" RX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
		efx_schedule_reset(efx, RESET_TYPE_RX_DESC_FETCH);
		break;
	case FSE_BZ_TX_DSC_ERROR_EV:
		EFX_ERR(efx, "TX DMA Q %d reports descriptor fetch error."
			" TX Q %d is disabled.\n", ev_sub_data, ev_sub_data);
		efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH);
		break;
	default:
		EFX_TRACE(efx, "channel %d unknown driver event code %d "
			  "data %04x\n", channel->channel, ev_sub_code,
			  ev_sub_data);
		break;
	}
}

int falcon_process_eventq(struct efx_channel *channel, int rx_quota)
{
	unsigned int read_ptr;
	efx_qword_t event, *p_event;
	int ev_code;
	int rx_packets = 0;

	read_ptr = channel->eventq_read_ptr;

	do {
		p_event = falcon_event(channel, read_ptr);
		event = *p_event;

		if (!falcon_event_present(&event))
			/* End of events */
			break;

		EFX_TRACE(channel->efx, "channel %d event is "EFX_QWORD_FMT"\n",
			  channel->channel, EFX_QWORD_VAL(event));

		/* Clear this event by marking it all ones */
		EFX_SET_QWORD(*p_event);

		ev_code = EFX_QWORD_FIELD(event, FSF_AZ_EV_CODE);

		switch (ev_code) {
		case FSE_AZ_EV_CODE_RX_EV:
			falcon_handle_rx_event(channel, &event);
			++rx_packets;
			break;
		case FSE_AZ_EV_CODE_TX_EV:
			falcon_handle_tx_event(channel, &event);
			break;
		case FSE_AZ_EV_CODE_DRV_GEN_EV:
			channel->eventq_magic = EFX_QWORD_FIELD(
				event, FSF_AZ_DRV_GEN_EV_MAGIC);
			EFX_LOG(channel->efx, "channel %d received generated "
				"event "EFX_QWORD_FMT"\n", channel->channel,
				EFX_QWORD_VAL(event));
			break;
		case FSE_AZ_EV_CODE_GLOBAL_EV:
			falcon_handle_global_event(channel, &event);
			break;
		case FSE_AZ_EV_CODE_DRIVER_EV:
			falcon_handle_driver_event(channel, &event);
			break;
		default:
			EFX_ERR(channel->efx, "channel %d unknown event type %d"
				" (data " EFX_QWORD_FMT ")\n", channel->channel,
				ev_code, EFX_QWORD_VAL(event));
		}

		/* Increment read pointer */
		read_ptr = (read_ptr + 1) & EFX_EVQ_MASK;

	} while (rx_packets < rx_quota);

	channel->eventq_read_ptr = read_ptr;
	return rx_packets;
}

void falcon_set_int_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);

}

/* Allocate buffer table entries for event queue */
int falcon_probe_eventq(struct efx_channel *channel)
{
	struct efx_nic *efx = channel->efx;
	BUILD_BUG_ON(EFX_EVQ_SIZE < 512 || EFX_EVQ_SIZE > 32768 ||
		     EFX_EVQ_SIZE & EFX_EVQ_MASK);
	return falcon_alloc_special_buffer(efx, &channel->eventq,
					   EFX_EVQ_SIZE * sizeof(efx_qword_t));
}

void falcon_init_eventq(struct efx_channel *channel)
{
	efx_oword_t evq_ptr;
	struct efx_nic *efx = channel->efx;

	EFX_LOG(efx, "channel %d event queue in special buffers %d-%d\n",
		channel->channel, channel->eventq.index,
		channel->eventq.index + channel->eventq.entries - 1);

	/* Pin event queue buffer */
	falcon_init_special_buffer(efx, &channel->eventq);

	/* Fill event queue with all ones (i.e. empty events) */
	memset(channel->eventq.addr, 0xff, channel->eventq.len);

	/* Push event queue to card */
	EFX_POPULATE_OWORD_3(evq_ptr,
			     FRF_AZ_EVQ_EN, 1,
			     FRF_AZ_EVQ_SIZE, __ffs(channel->eventq.entries),
			     FRF_AZ_EVQ_BUF_BASE_ID, channel->eventq.index);
	efx_writeo_table(efx, &evq_ptr, efx->type->evq_ptr_tbl_base,
			 channel->channel);

	falcon_set_int_moderation(channel);
}

void falcon_fini_eventq(struct efx_channel *channel)
{
	efx_oword_t eventq_ptr;
	struct efx_nic *efx = channel->efx;

	/* Remove event queue from card */
	EFX_ZERO_OWORD(eventq_ptr);
	efx_writeo_table(efx, &eventq_ptr, efx->type->evq_ptr_tbl_base,
			 channel->channel);

	/* Unpin event queue */
	falcon_fini_special_buffer(efx, &channel->eventq);
}

/* Free buffers backing event queue */
void falcon_remove_eventq(struct efx_channel *channel)
{
	falcon_free_special_buffer(channel->efx, &channel->eventq);
}


/* Generates a test event on the event queue.  A subsequent call to
 * process_eventq() should pick up the event and place the value of
 * "magic" into channel->eventq_magic;
 */
void falcon_generate_test_event(struct efx_channel *channel, unsigned int magic)
{
	efx_qword_t test_event;

	EFX_POPULATE_QWORD_2(test_event, FSF_AZ_EV_CODE,
			     FSE_AZ_EV_CODE_DRV_GEN_EV,
			     FSF_AZ_DRV_GEN_EV_MAGIC, magic);
	falcon_generate_event(channel, &test_event);
}

void falcon_sim_phy_event(struct efx_nic *efx)
{
	efx_qword_t phy_event;

	EFX_POPULATE_QWORD_1(phy_event, FSF_AZ_EV_CODE,
			     FSE_AZ_EV_CODE_GLOBAL_EV);
	if (EFX_IS10G(efx))
		EFX_SET_QWORD_FIELD(phy_event, FSF_AB_GLB_EV_XG_PHY0_INTR, 1);
	else
		EFX_SET_QWORD_FIELD(phy_event, FSF_AB_GLB_EV_G_PHY0_INTR, 1);

	falcon_generate_event(&efx->channel[0], &phy_event);
}

/**************************************************************************
 *
 * Flush handling
 *
 **************************************************************************/


static void falcon_poll_flush_events(struct efx_nic *efx)
{
	struct efx_channel *channel = &efx->channel[0];
	struct efx_tx_queue *tx_queue;
	struct efx_rx_queue *rx_queue;
	unsigned int read_ptr = channel->eventq_read_ptr;
	unsigned int end_ptr = (read_ptr - 1) & EFX_EVQ_MASK;

	do {
		efx_qword_t *event = falcon_event(channel, read_ptr);
		int ev_code, ev_sub_code, ev_queue;
		bool ev_failed;

		if (!falcon_event_present(event))
			break;

		ev_code = EFX_QWORD_FIELD(*event, FSF_AZ_EV_CODE);
		ev_sub_code = EFX_QWORD_FIELD(*event,
					      FSF_AZ_DRIVER_EV_SUBCODE);
		if (ev_code == FSE_AZ_EV_CODE_DRIVER_EV &&
		    ev_sub_code == FSE_AZ_TX_DESCQ_FLS_DONE_EV) {
			ev_queue = EFX_QWORD_FIELD(*event,
						   FSF_AZ_DRIVER_EV_SUBDATA);
			if (ev_queue < EFX_TX_QUEUE_COUNT) {
				tx_queue = efx->tx_queue + ev_queue;
				tx_queue->flushed = FLUSH_DONE;
			}
		} else if (ev_code == FSE_AZ_EV_CODE_DRIVER_EV &&
			   ev_sub_code == FSE_AZ_RX_DESCQ_FLS_DONE_EV) {
			ev_queue = EFX_QWORD_FIELD(
				*event, FSF_AZ_DRIVER_EV_RX_DESCQ_ID);
			ev_failed = EFX_QWORD_FIELD(
				*event, FSF_AZ_DRIVER_EV_RX_FLUSH_FAIL);
			if (ev_queue < efx->n_rx_queues) {
				rx_queue = efx->rx_queue + ev_queue;
				rx_queue->flushed =
					ev_failed ? FLUSH_FAILED : FLUSH_DONE;
			}
		}

		/* We're about to destroy the queue anyway, so
		 * it's ok to throw away every non-flush event */
		EFX_SET_QWORD(*event);

		read_ptr = (read_ptr + 1) & EFX_EVQ_MASK;
	} while (read_ptr != end_ptr);

	channel->eventq_read_ptr = read_ptr;
}

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);
}

/* Handle tx and rx flushes at the same time, since they run in
 * parallel in the hardware and there's no reason for us to
 * serialise them */
int falcon_flush_queues(struct efx_nic *efx)
{
	struct efx_rx_queue *rx_queue;
	struct efx_tx_queue *tx_queue;
	int i, tx_pending, rx_pending;

	falcon_prepare_flush(efx);

	/* Flush all tx queues in parallel */
	efx_for_each_tx_queue(tx_queue, efx)
		falcon_flush_tx_queue(tx_queue);

	/* The hardware supports four concurrent rx flushes, each of which may
	 * need to be retried if there is an outstanding descriptor fetch */
	for (i = 0; i < FALCON_FLUSH_POLL_COUNT; ++i) {
		rx_pending = tx_pending = 0;
		efx_for_each_rx_queue(rx_queue, efx) {
			if (rx_queue->flushed == FLUSH_PENDING)
				++rx_pending;
		}
		efx_for_each_rx_queue(rx_queue, efx) {
			if (rx_pending == FALCON_RX_FLUSH_COUNT)
				break;
			if (rx_queue->flushed == FLUSH_FAILED ||
			    rx_queue->flushed == FLUSH_NONE) {
				falcon_flush_rx_queue(rx_queue);
				++rx_pending;
			}
		}
		efx_for_each_tx_queue(tx_queue, efx) {
			if (tx_queue->flushed != FLUSH_DONE)
				++tx_pending;
		}

		if (rx_pending == 0 && tx_pending == 0)
			return 0;

		msleep(FALCON_FLUSH_INTERVAL);
		falcon_poll_flush_events(efx);
	}

	/* Mark the queues as all flushed. We're going to return failure
	 * leading to a reset, or fake up success anyway */
	efx_for_each_tx_queue(tx_queue, efx) {
		if (tx_queue->flushed != FLUSH_DONE)
			EFX_ERR(efx, "tx queue %d flush command timed out\n",
				tx_queue->queue);
		tx_queue->flushed = FLUSH_DONE;
	}
	efx_for_each_rx_queue(rx_queue, efx) {
		if (rx_queue->flushed != FLUSH_DONE)
			EFX_ERR(efx, "rx queue %d flush command timed out\n",
				rx_queue->queue);
		rx_queue->flushed = FLUSH_DONE;
	}

	if (EFX_WORKAROUND_7803(efx))
		return 0;

	return -ETIMEDOUT;
}

/**************************************************************************
 *
 * Falcon hardware interrupts
 * The hardware interrupt handler does very little work; all the event
 * queue processing is carried out by per-channel tasklets.
 *
 **************************************************************************/

/* Enable/disable/generate Falcon interrupts */
static inline void falcon_interrupts(struct efx_nic *efx, int enabled,
				     int force)
{
	efx_oword_t int_en_reg_ker;

	EFX_POPULATE_OWORD_2(int_en_reg_ker,
			     FRF_AZ_KER_INT_KER, force,
			     FRF_AZ_DRV_INT_EN_KER, enabled);
	efx_writeo(efx, &int_en_reg_ker, FR_AZ_INT_EN_KER);
}

void falcon_enable_interrupts(struct efx_nic *efx)
{
	efx_oword_t int_adr_reg_ker;
	struct efx_channel *channel;

	EFX_ZERO_OWORD(*((efx_oword_t *) efx->irq_status.addr));
	wmb(); /* Ensure interrupt vector is clear before interrupts enabled */

	/* Program address */
	EFX_POPULATE_OWORD_2(int_adr_reg_ker,
			     FRF_AZ_NORM_INT_VEC_DIS_KER,
			     EFX_INT_MODE_USE_MSI(efx),
			     FRF_AZ_INT_ADR_KER, efx->irq_status.dma_addr);
	efx_writeo(efx, &int_adr_reg_ker, FR_AZ_INT_ADR_KER);

	/* Enable interrupts */
	falcon_interrupts(efx, 1, 0);

	/* Force processing of all the channels to get the EVQ RPTRs up to
	   date */
	efx_for_each_channel(channel, efx)
		efx_schedule_channel(channel);
}

void falcon_disable_interrupts(struct efx_nic *efx)
{
	/* Disable interrupts */
	falcon_interrupts(efx, 0, 0);
}

/* Generate a Falcon test interrupt
 * Interrupt must already have been enabled, otherwise nasty things
 * may happen.
 */
void falcon_generate_interrupt(struct efx_nic *efx)
{
	falcon_interrupts(efx, 1, 1);
}

/* 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);
}

/* Process a fatal interrupt
 * Disable bus mastering ASAP and schedule a reset
 */
static irqreturn_t falcon_fatal_interrupt(struct efx_nic *efx)
{
	struct falcon_nic_data *nic_data = efx->nic_data;
	efx_oword_t *int_ker = efx->irq_status.addr;
	efx_oword_t fatal_intr;
	int error, mem_perr;

	efx_reado(efx, &fatal_intr, FR_AZ_FATAL_INTR_KER);
	error = EFX_OWORD_FIELD(fatal_intr, FRF_AZ_FATAL_INTR);

	EFX_ERR(efx, "SYSTEM ERROR " EFX_OWORD_FMT " status "
		EFX_OWORD_FMT ": %s\n", EFX_OWORD_VAL(*int_ker),
		EFX_OWORD_VAL(fatal_intr),
		error ? "disabling bus mastering" : "no recognised error");
	if (error == 0)
		goto out;

	/* If this is a memory parity error dump which blocks are offending */
	mem_perr = EFX_OWORD_FIELD(fatal_intr, FRF_AZ_MEM_PERR_INT_KER);
	if (mem_perr) {
		efx_oword_t reg;
		efx_reado(efx, &reg, FR_AZ_MEM_STAT);
		EFX_ERR(efx, "SYSTEM ERROR: memory parity error "
			EFX_OWORD_FMT "\n", EFX_OWORD_VAL(reg));
	}

	/* Disable both devices */
	pci_clear_master(efx->pci_dev);
	if (FALCON_IS_DUAL_FUNC(efx))
		pci_clear_master(nic_data->pci_dev2);
	falcon_disable_interrupts(efx);

	/* Count errors and reset or disable the NIC accordingly */
	if (efx->int_error_count == 0 ||
	    time_after(jiffies, efx->int_error_expire)) {
		efx->int_error_count = 0;
		efx->int_error_expire =
			jiffies + FALCON_INT_ERROR_EXPIRE * HZ;
	}
	if (++efx->int_error_count < FALCON_MAX_INT_ERRORS) {
		EFX_ERR(efx, "SYSTEM ERROR - reset scheduled\n");
		efx_schedule_reset(efx, RESET_TYPE_INT_ERROR);
	} else {
		EFX_ERR(efx, "SYSTEM ERROR - max number of errors seen."
			"NIC will be disabled\n");
		efx_schedule_reset(efx, RESET_TYPE_DISABLE);
	}
out:
	return IRQ_HANDLED;
}

/* Handle a legacy interrupt from Falcon
 * Acknowledges the interrupt and schedule event queue processing.
 */
static irqreturn_t falcon_legacy_interrupt_b0(int irq, void *dev_id)
{
	struct efx_nic *efx = dev_id;
	efx_oword_t *int_ker = efx->irq_status.addr;
	irqreturn_t result = IRQ_NONE;
	struct efx_channel *channel;
	efx_dword_t reg;
	u32 queues;
	int syserr;

	/* Read the ISR which also ACKs the interrupts */
	efx_readd(efx, &reg, FR_BZ_INT_ISR0);
	queues = EFX_EXTRACT_DWORD(reg, 0, 31);

	/* 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 falcon_fatal_interrupt(efx);

	/* Schedule processing of any interrupting queues */
	efx_for_each_channel(channel, efx) {
		if ((queues & 1) ||
		    falcon_event_present(
			    falcon_event(channel, channel->eventq_read_ptr))) {
			efx_schedule_channel(channel);
			result = IRQ_HANDLED;
		}
		queues >>= 1;
	}

	if (result == IRQ_HANDLED) {
		efx->last_irq_cpu = raw_smp_processor_id();
		EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n",
			  irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg));
	}

	return result;
}


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;
	struct efx_channel *channel;
	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))) {
		EFX_TRACE(efx, "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();
	EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
		  irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));

	/* 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 falcon_fatal_interrupt(efx);

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

	/* Schedule processing of any interrupting queues */
	channel = &efx->channel[0];
	while (queues) {
		if (queues & 0x01)
			efx_schedule_channel(channel);
		channel++;
		queues >>= 1;
	}

	return IRQ_HANDLED;
}

/* Handle an MSI interrupt from Falcon
 *
 * Handle an MSI hardware interrupt.  This routine schedules event
 * queue processing.  No interrupt acknowledgement cycle is necessary.
 * Also, we never need to check that the interrupt is for us, since
 * MSI interrupts cannot be shared.
 */
static irqreturn_t falcon_msi_interrupt(int irq, void *dev_id)
{
	struct efx_channel *channel = dev_id;
	struct efx_nic *efx = channel->efx;
	efx_oword_t *int_ker = efx->irq_status.addr;
	int syserr;

	efx->last_irq_cpu = raw_smp_processor_id();
	EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
		  irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));

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

	/* Schedule processing of the channel */
	efx_schedule_channel(channel);

	return IRQ_HANDLED;
}


/* Setup RSS indirection table.
 * This maps from the hash value of the packet to RXQ
 */
static void falcon_setup_rss_indir_table(struct efx_nic *efx)
{
	int i = 0;
	unsigned long offset;
	efx_dword_t dword;

	if (falcon_rev(efx) < FALCON_REV_B0)
		return;

	for (offset = FR_BZ_RX_INDIRECTION_TBL;
	     offset < FR_BZ_RX_INDIRECTION_TBL + 0x800;
	     offset += 0x10) {
		EFX_POPULATE_DWORD_1(dword, FRF_BZ_IT_QUEUE,
				     i % efx->n_rx_queues);
		efx_writed(efx, &dword, offset);
		i++;
	}
}

/* Hook interrupt handler(s)
 * Try MSI and then legacy interrupts.
 */
int falcon_init_interrupt(struct efx_nic *efx)
{
	struct efx_channel *channel;
	int rc;

	if (!EFX_INT_MODE_USE_MSI(efx)) {
		irq_handler_t handler;
		if (falcon_rev(efx) >= FALCON_REV_B0)
			handler = falcon_legacy_interrupt_b0;
		else
			handler = falcon_legacy_interrupt_a1;

		rc = request_irq(efx->legacy_irq, handler, IRQF_SHARED,
				 efx->name, efx);
		if (rc) {
			EFX_ERR(efx, "failed to hook legacy IRQ %d\n",
				efx->pci_dev->irq);
			goto fail1;
		}
		return 0;
	}

	/* Hook MSI or MSI-X interrupt */
	efx_for_each_channel(channel, efx) {
		rc = request_irq(channel->irq, falcon_msi_interrupt,
				 IRQF_PROBE_SHARED, /* Not shared */
				 channel->name, channel);
		if (rc) {
			EFX_ERR(efx, "failed to hook IRQ %d\n", channel->irq);
			goto fail2;
		}
	}

	return 0;

 fail2:
	efx_for_each_channel(channel, efx)
		free_irq(channel->irq, channel);
 fail1:
	return rc;
}

void falcon_fini_interrupt(struct efx_nic *efx)
{
	struct efx_channel *channel;
	efx_oword_t reg;

	/* Disable MSI/MSI-X interrupts */
	efx_for_each_channel(channel, efx) {
		if (channel->irq)
			free_irq(channel->irq, channel);
	}

	/* ACK legacy interrupt */
	if (falcon_rev(efx) >= FALCON_REV_B0)
		efx_reado(efx, &reg, FR_BZ_INT_ISR0);
	else
		falcon_irq_ack_a1(efx);

	/* Disable legacy interrupt */
	if (efx->legacy_irq)
		free_irq(efx->legacy_irq, efx);
}

/**************************************************************************
 *
 * 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)) {
			EFX_ERR(efx, "timed out waiting for SPI\n");
			return -ETIMEDOUT;
		}
		schedule_timeout_uninterruptible(1);
	}
}

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

	/* Input validation */
	if (len > FALCON_SPI_MAX_LEN)
		return -EINVAL;
	BUG_ON(!mutex_is_locked(&efx->spi_lock));

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

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

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

	for (;;) {
		rc = falcon_spi_cmd(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)) {
			EFX_ERR(efx, "SPI write timeout on device %d"
				" last status=0x%02x\n",
				spi->device_id, status);
			return -ETIMEDOUT;
		}
		schedule_timeout_uninterruptible(1);
	}
}

int falcon_spi_read(const struct efx_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 = efx_spi_munge_command(spi, SPI_READ, start + pos);
		rc = falcon_spi_cmd(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;
}

int falcon_spi_write(const struct efx_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(spi, SPI_WREN, -1, NULL, NULL, 0);
		if (rc)
			break;

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

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

		command = efx_spi_munge_command(spi, SPI_READ, start + pos);
		rc = falcon_spi_cmd(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;
}

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

static int falcon_reset_macs(struct efx_nic *efx)
{
	efx_oword_t reg;
	int count;

	if (falcon_rev(efx) < FALCON_REV_B0) {
		/* It's not safe to use GLB_CTL_REG to reset the
		 * macs, so instead use the internal MAC resets
		 */
		if (!EFX_IS10G(efx)) {
			EFX_POPULATE_OWORD_1(reg, FRF_AB_GM_SW_RST, 1);
			efx_writeo(efx, &reg, FR_AB_GM_CFG1);
			udelay(1000);

			EFX_POPULATE_OWORD_1(reg, FRF_AB_GM_SW_RST, 0);
			efx_writeo(efx, &reg, FR_AB_GM_CFG1);
			udelay(1000);
			return 0;
		} else {
			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 0;
				udelay(10);
			}

			EFX_ERR(efx, "timed out waiting for XMAC core reset\n");
			return -ETIMEDOUT;
		}
	}

	/* MAC stats will fail whilst the TX fifo is draining. Serialise
	 * the drain sequence with the statistics fetch */
	falcon_stop_nic_stats(efx);

	efx_reado(efx, &reg, FR_AB_MAC_CTRL);
	EFX_SET_OWORD_FIELD(reg, FRF_BB_TXFIFO_DRAIN_EN, 1);
	efx_writeo(efx, &reg, 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)) {
			EFX_LOG(efx, "Completed MAC reset after %d loops\n",
				count);
			break;
		}
		if (count > 20) {
			EFX_ERR(efx, "MAC reset failed\n");
			break;
		}
		count++;
		udelay(10);
	}

	/* If we've reset the EM block and the link is up, then
	 * we'll have to kick the XAUI link so the PHY can recover */
	if (efx->link_state.up && EFX_IS10G(efx) && EFX_WORKAROUND_5147(efx))
		falcon_reset_xaui(efx);

	falcon_start_nic_stats(efx);

	return 0;
}

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

	if ((falcon_rev(efx) < FALCON_REV_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);
}

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

	if (falcon_rev(efx) < FALCON_REV_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);

	if (!efx->link_state.up)
		falcon_drain_tx_fifo(efx);
}

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;
	bool tx_fc;

	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->promiscuous,
			     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 (falcon_rev(efx) >= FALCON_REV_B0) {
		EFX_SET_OWORD_FIELD(reg, FRF_BB_TXFIFO_DRAIN_EN,
				    !link_state->up);
	}

	efx_writeo(efx, &reg, FR_AB_MAC_CTRL);

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

	/* Transmission of pause frames when RX crosses the threshold is
	 * covered by RX_XOFF_MAC_EN and XM_TX_CFG_REG:XM_FCNTL.
	 * Action on receipt of pause frames is controller by XM_DIS_FCNTL */
	tx_fc = !!(efx->link_state.fc & EFX_FC_TX);
	efx_reado(efx, &reg, FR_AZ_RX_CFG);
	EFX_SET_OWORD_FIELD(reg, FRF_AZ_RX_XOFF_MAC_EN, tx_fc);

	/* Unisolate the MAC -> RX */
	if (falcon_rev(efx) >= FALCON_REV_B0)
		EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_INGR_EN, 1);
	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);

	if (nic_data->stats_dma_done == NULL)
		return;	/* no mac selected */

	*nic_data->stats_dma_done = FALCON_STATS_NOT_DONE;
	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 = 0;
	if (*nic_data->stats_dma_done == FALCON_STATS_DONE) {
		rmb(); /* read the done flag before the stats */
		efx->mac_op->update_stats(efx);
	} else {
		EFX_ERR(efx, "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);
}

/**************************************************************************
 *
 * 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 upto 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) {
				EFX_ERR(efx, "error from GMII access "
					EFX_OWORD_FMT"\n",
					EFX_OWORD_VAL(md_stat));
				return -EIO;
			}
			return 0;
		}
		udelay(10);
	}
	EFX_ERR(efx, "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);
	efx_oword_t reg;
	int rc;

	EFX_REGDUMP(efx, "writing MDIO %d register %d.%d with 0x%04x\n",
		    prtad, devad, addr, value);

	spin_lock_bh(&efx->phy_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:
	spin_unlock_bh(&efx->phy_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);
	efx_oword_t reg;
	int rc;

	spin_lock_bh(&efx->phy_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);
		EFX_REGDUMP(efx, "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);

		EFX_LOG(efx, "read from MDIO %d register %d.%d, got error %d\n",
			prtad, devad, addr, rc);
	}

 out:
	spin_unlock_bh(&efx->phy_lock);
	return rc;
}

static void falcon_clock_mac(struct efx_nic *efx)
{
	unsigned strap_val;
	efx_oword_t nic_stat;

	/* Configure the NIC generated MAC clock correctly */
	efx_reado(efx, &nic_stat, FR_AB_NIC_STAT);
	strap_val = EFX_IS10G(efx) ? 5 : 3;
	if (falcon_rev(efx) >= FALCON_REV_B0) {
		EFX_SET_OWORD_FIELD(nic_stat, FRF_BB_EE_STRAP_EN, 1);
		EFX_SET_OWORD_FIELD(nic_stat, FRF_BB_EE_STRAP, strap_val);
		efx_writeo(efx, &nic_stat, FR_AB_NIC_STAT);
	} else {
		/* Falcon A1 does not support 1G/10G speed switching
		 * and must not be used with a PHY that does. */
		BUG_ON(EFX_OWORD_FIELD(nic_stat, FRF_AB_STRAP_PINS) !=
		       strap_val);
	}
}

int falcon_switch_mac(struct efx_nic *efx)
{
	struct efx_mac_operations *old_mac_op = efx->mac_op;
	struct falcon_nic_data *nic_data = efx->nic_data;
	unsigned int stats_done_offset;
	int rc = 0;

	/* Don't try to fetch MAC stats while we're switching MACs */
	falcon_stop_nic_stats(efx);

	/* Internal loopbacks override the phy speed setting */
	if (efx->loopback_mode == LOOPBACK_GMAC) {
		efx->link_state.speed = 1000;
		efx->link_state.fd = true;
	} else if (LOOPBACK_INTERNAL(efx)) {
		efx->link_state.speed = 10000;
		efx->link_state.fd = true;
	}

	WARN_ON(!mutex_is_locked(&efx->mac_lock));
	efx->mac_op = (EFX_IS10G(efx) ?
		       &falcon_xmac_operations : &falcon_gmac_operations);

	if (EFX_IS10G(efx))
		stats_done_offset = XgDmaDone_offset;
	else
		stats_done_offset = GDmaDone_offset;
	nic_data->stats_dma_done = efx->stats_buffer.addr + stats_done_offset;

	if (old_mac_op == efx->mac_op)
		goto out;

	falcon_clock_mac(efx);

	EFX_LOG(efx, "selected %cMAC\n", EFX_IS10G(efx) ? 'X' : 'G');
	/* Not all macs support a mac-level link state */
	efx->xmac_poll_required = false;

	rc = falcon_reset_macs(efx);
out:
	falcon_start_nic_stats(efx);
	return rc;
}

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

	switch (efx->phy_type) {
	case PHY_TYPE_SFX7101:
		efx->phy_op = &falcon_sfx7101_phy_ops;
		break;
	case PHY_TYPE_SFT9001A:
	case PHY_TYPE_SFT9001B:
		efx->phy_op = &falcon_sft9001_phy_ops;
		break;
	case PHY_TYPE_QT2022C2:
	case PHY_TYPE_QT2025C:
		efx->phy_op = &falcon_qt202x_phy_ops;
		break;
	default:
		EFX_ERR(efx, "Unknown PHY type %d\n",
			efx->phy_type);
		return -ENODEV;
	}

	if (efx->phy_op->macs & EFX_XMAC)
		efx->loopback_modes |= ((1 << LOOPBACK_XGMII) |
					(1 << LOOPBACK_XGXS) |
					(1 << LOOPBACK_XAUI));
	if (efx->phy_op->macs & EFX_GMAC)
		efx->loopback_modes |= (1 << LOOPBACK_GMAC);
	efx->loopback_modes |= efx->phy_op->loopbacks;

	/* Set up MDIO structure for PHY */
	efx->mdio.mmds = efx->phy_op->mmds;
	efx->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22;
	efx->mdio.mdio_read = falcon_mdio_read;
	efx->mdio.mdio_write = falcon_mdio_write;

	/* Hardware flow ctrl. FalconA RX FIFO too small for pause generation */
	if (falcon_rev(efx) >= FALCON_REV_B0)
		efx->wanted_fc = EFX_FC_RX | EFX_FC_TX;
	else
		efx->wanted_fc = EFX_FC_RX;

	/* Allocate buffer for stats */
	rc = falcon_alloc_buffer(efx, &efx->stats_buffer,
				 FALCON_MAC_STATS_SIZE);
	if (rc)
		return rc;
	EFX_LOG(efx, "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;
}

void falcon_remove_port(struct efx_nic *efx)
{
	falcon_free_buffer(efx, &efx->stats_buffer);
}

/**************************************************************************
 *
 * Multicast filtering
 *
 **************************************************************************
 */

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);
}


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

int falcon_read_nvram(struct efx_nic *efx, struct falcon_nvconfig *nvconfig_out)
{
	struct falcon_nvconfig *nvconfig;
	struct efx_spi_device *spi;
	void *region;
	int rc, magic_num, struct_ver;
	__le16 *word, *limit;
	u32 csum;

	spi = efx->spi_flash ? efx->spi_flash : efx->spi_eeprom;
	if (!spi)
		return -EINVAL;

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

	mutex_lock(&efx->spi_lock);
	rc = falcon_spi_read(spi, 0, FALCON_NVCONFIG_END, NULL, region);
	mutex_unlock(&efx->spi_lock);
	if (rc) {
		EFX_ERR(efx, "Failed to read %s\n",
			efx->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) {
		EFX_ERR(efx, "NVRAM bad magic 0x%x\n", magic_num);
		goto out;
	}
	if (struct_ver < 2) {
		EFX_ERR(efx, "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) {
		EFX_ERR(efx, "NVRAM has incorrect checksum\n");
		goto out;
	}

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

 out:
	kfree(region);
	return rc;
}

/* Registers tested in the falcon register test */
static struct {
	unsigned address;
	efx_oword_t mask;
} efx_test_registers[] = {
	{ FR_AZ_ADR_REGION,
	  EFX_OWORD32(0x0001FFFF, 0x0001FFFF, 0x0001FFFF, 0x0001FFFF) },
	{ 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 bool efx_masked_compare_oword(const efx_oword_t *a, const efx_oword_t *b,
				     const efx_oword_t *mask)
{
	return ((a->u64[0] ^ b->u64[0]) & mask->u64[0]) ||
		((a->u64[1] ^ b->u64[1]) & mask->u64[1]);
}

int falcon_test_registers(struct efx_nic *efx)
{
	unsigned address = 0, i, j;
	efx_oword_t mask, imask, original, reg, buf;

	/* Falcon should be in loopback to isolate the XMAC from the PHY */
	WARN_ON(!LOOPBACK_INTERNAL(efx));

	for (i = 0; i < ARRAY_SIZE(efx_test_registers); ++i) {
		address = efx_test_registers[i].address;
		mask = imask = efx_test_registers[i].mask;
		EFX_INVERT_OWORD(imask);

		efx_reado(efx, &original, address);

		/* bit sweep on and off */
		for (j = 0; j < 128; j++) {
			if (!EFX_EXTRACT_OWORD32(mask, j, j))
				continue;

			/* Test this testable bit can be set in isolation */
			EFX_AND_OWORD(reg, original, mask);
			EFX_SET_OWORD32(reg, j, j, 1);

			efx_writeo(efx, &reg, address);
			efx_reado(efx, &buf, address);

			if (efx_masked_compare_oword(&reg, &buf, &mask))
				goto fail;

			/* Test this testable bit can be cleared in isolation */
			EFX_OR_OWORD(reg, original, mask);
			EFX_SET_OWORD32(reg, j, j, 0);

			efx_writeo(efx, &reg, address);
			efx_reado(efx, &buf, address);

			if (efx_masked_compare_oword(&reg, &buf, &mask))
				goto fail;
		}

		efx_writeo(efx, &original, address);
	}

	return 0;

fail:
	EFX_ERR(efx, "wrote "EFX_OWORD_FMT" read "EFX_OWORD_FMT
		" at address 0x%x mask "EFX_OWORD_FMT"\n", EFX_OWORD_VAL(reg),
		EFX_OWORD_VAL(buf), address, EFX_OWORD_VAL(mask));
	return -EIO;
}

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

/* Resets NIC to known state.  This routine must be called in process
 * context and is allowed to sleep. */
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;

	EFX_LOG(efx, "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) {
			EFX_ERR(efx, "failed to backup PCI state of primary "
				"function prior to hardware reset\n");
			goto fail1;
		}
		if (FALCON_IS_DUAL_FUNC(efx)) {
			rc = pci_save_state(nic_data->pci_dev2);
			if (rc) {
				EFX_ERR(efx, "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);

	EFX_LOG(efx, "waiting for hardware reset\n");
	schedule_timeout_uninterruptible(HZ / 20);

	/* Restore PCI configuration if needed */
	if (method == RESET_TYPE_WORLD) {
		if (FALCON_IS_DUAL_FUNC(efx)) {
			rc = pci_restore_state(nic_data->pci_dev2);
			if (rc) {
				EFX_ERR(efx, "failed to restore PCI config for "
					"the secondary function\n");
				goto fail3;
			}
		}
		rc = pci_restore_state(efx->pci_dev);
		if (rc) {
			EFX_ERR(efx, "failed to restore PCI config for the "
				"primary function\n");
			goto fail4;
		}
		EFX_LOG(efx, "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;
		EFX_ERR(efx, "timed out waiting for hardware reset\n");
		goto fail5;
	}
	EFX_LOG(efx, "hardware reset complete\n");

	return 0;

	/* pci_save_state() and pci_restore_state() MUST be called in pairs */
fail2:
fail3:
	pci_restore_state(efx->pci_dev);
fail1:
fail4:
fail5:
	return rc;
}

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

	rc = falcon_board(efx)->type->monitor(efx);
	if (rc) {
		EFX_ERR(efx, "Board sensor %s; shutting down PHY\n",
			(rc == -ERANGE) ? "reported fault" : "failed");
		efx->phy_mode |= PHY_MODE_LOW_POWER;
		falcon_sim_phy_event(efx);
	}
	efx->phy_op->poll(efx);
	if (EFX_IS10G(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 {
		EFX_LOG(efx, "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)) {
			EFX_LOG(efx, "SRAM reset complete\n");

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

	EFX_ERR(efx, "timed out waiting for SRAM reset\n");
	return -ETIMEDOUT;
}

static int falcon_spi_device_init(struct efx_nic *efx,
				  struct efx_spi_device **spi_device_ret,
				  unsigned int device_id, u32 device_type)
{
	struct efx_spi_device *spi_device;

	if (device_type != 0) {
		spi_device = kzalloc(sizeof(*spi_device), GFP_KERNEL);
		if (!spi_device)
			return -ENOMEM;
		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);

		spi_device->efx = efx;
	} else {
		spi_device = NULL;
	}

	kfree(*spi_device_ret);
	*spi_device_ret = spi_device;
	return 0;
}


static void falcon_remove_spi_devices(struct efx_nic *efx)
{
	kfree(efx->spi_eeprom);
	efx->spi_eeprom = NULL;
	kfree(efx->spi_flash);
	efx->spi_flash = NULL;
}

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

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

	rc = falcon_read_nvram(efx, nvconfig);
	if (rc == -EINVAL) {
		EFX_ERR(efx, "NVRAM is invalid therefore using defaults\n");
		efx->phy_type = PHY_TYPE_NONE;
		efx->mdio.prtad = MDIO_PRTAD_NONE;
		board_rev = 0;
		rc = 0;
	} else if (rc) {
		goto fail1;
	} else {
		struct falcon_nvconfig_board_v2 *v2 = &nvconfig->board_v2;
		struct falcon_nvconfig_board_v3 *v3 = &nvconfig->board_v3;

		efx->phy_type = v2->port0_phy_type;
		efx->mdio.prtad = v2->port0_phy_addr;
		board_rev = le16_to_cpu(v2->board_revision);

		if (le16_to_cpu(nvconfig->board_struct_ver) >= 3) {
			rc = falcon_spi_device_init(
				efx, &efx->spi_flash, FFE_AB_SPI_DEVICE_FLASH,
				le32_to_cpu(v3->spi_device_type
					    [FFE_AB_SPI_DEVICE_FLASH]));
			if (rc)
				goto fail2;
			rc = falcon_spi_device_init(
				efx, &efx->spi_eeprom, FFE_AB_SPI_DEVICE_EEPROM,
				le32_to_cpu(v3->spi_device_type
					    [FFE_AB_SPI_DEVICE_EEPROM]));
			if (rc)
				goto fail2;
		}
	}

	/* Read the MAC addresses */
	memcpy(efx->mac_address, nvconfig->mac_address[0], ETH_ALEN);

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

	falcon_probe_board(efx, board_rev);

	kfree(nvconfig);
	return 0;

 fail2:
	falcon_remove_spi_devices(efx);
 fail1:
	kfree(nvconfig);
	return rc;
}

/* Probe the NIC variant (revision, ASIC vs FPGA, function count, port
 * count, port speed).  Set workaround and feature flags accordingly.
 */
static int falcon_probe_nic_variant(struct efx_nic *efx)
{
	efx_oword_t altera_build;
	efx_oword_t nic_stat;

	efx_reado(efx, &altera_build, FR_AZ_ALTERA_BUILD);
	if (EFX_OWORD_FIELD(altera_build, FRF_AZ_ALTERA_BUILD_VER)) {
		EFX_ERR(efx, "Falcon FPGA not supported\n");
		return -ENODEV;
	}

	efx_reado(efx, &nic_stat, FR_AB_NIC_STAT);

	switch (falcon_rev(efx)) {
	case FALCON_REV_A0:
	case 0xff:
		EFX_ERR(efx, "Falcon rev A0 not supported\n");
		return -ENODEV;

	case FALCON_REV_A1:
		if (EFX_OWORD_FIELD(nic_stat, FRF_AA_STRAP_PCIE) == 0) {
			EFX_ERR(efx, "Falcon rev A1 PCI-X not supported\n");
			return -ENODEV;
		}
		break;

	case FALCON_REV_B0:
		break;

	default:
		EFX_ERR(efx, "Unknown Falcon rev %d\n", falcon_rev(efx));
		return -ENODEV;
	}

	/* Initial assumed speed */
	efx->link_state.speed = EFX_OWORD_FIELD(nic_stat, FRF_AB_STRAP_10G) ? 10000 : 1000;

	return 0;
}

/* Probe all SPI devices on the NIC */
static void falcon_probe_spi_devices(struct efx_nic *efx)
{
	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);
		EFX_LOG(efx, "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;
		EFX_LOG(efx, "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);
	}

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

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

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

	/* Determine number of ports etc. */
	rc = falcon_probe_nic_variant(efx);
	if (rc)
		goto fail1;

	/* Probe secondary function if expected */
	if (FALCON_IS_DUAL_FUNC(efx)) {
		struct pci_dev *dev = pci_dev_get(efx->pci_dev);

		while ((dev = pci_get_device(EFX_VENDID_SFC, FALCON_A_S_DEVID,
					     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) {
			EFX_ERR(efx, "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) {
		EFX_ERR(efx, "failed to reset NIC\n");
		goto fail3;
	}

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

	EFX_LOG(efx, "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)
		goto fail5;

	/* 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) {
		EFX_ERR(efx, "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:
	BUG_ON(i2c_del_adapter(&board->i2c_adap));
	memset(&board->i2c_adap, 0, sizeof(board->i2c_adap));
 fail5:
	falcon_remove_spi_devices(efx);
	falcon_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)
{
	/* Prior to Siena the RX DMA engine will split each frame at
	 * intervals of RX_USR_BUF_SIZE (32-byte units). We set it to
	 * be so large that that never happens. */
	const unsigned huge_buf_size = (3 * 4096) >> 5;
	/* RX control FIFO thresholds (32 entries) */
	const unsigned ctrl_xon_thr = 20;
	const unsigned ctrl_xoff_thr = 25;
	/* RX data FIFO thresholds (256-byte units; size varies) */
	int data_xon_thr = rx_xon_thresh_bytes >> 8;
	int data_xoff_thr = rx_xoff_thresh_bytes >> 8;
	efx_oword_t reg;

	efx_reado(efx, &reg, FR_AZ_RX_CFG);
	if (falcon_rev(efx) <= FALCON_REV_A1) {
		/* Data FIFO size is 5.5K */
		if (data_xon_thr < 0)
			data_xon_thr = 512 >> 8;
		if (data_xoff_thr < 0)
			data_xoff_thr = 2048 >> 8;
		EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_DESC_PUSH_EN, 0);
		EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_USR_BUF_SIZE,
				    huge_buf_size);
		EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_XON_MAC_TH, data_xon_thr);
		EFX_SET_OWORD_FIELD(reg, FRF_AA_RX_XOFF_MAC_TH, data_xoff_thr);
		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 */
		if (data_xon_thr < 0)
			data_xon_thr = 27648 >> 8; /* ~3*max MTU */
		if (data_xoff_thr < 0)
			data_xoff_thr = 54272 >> 8; /* ~80Kb - 3*max MTU */
		EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_DESC_PUSH_EN, 0);
		EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_USR_BUF_SIZE,
				    huge_buf_size);
		EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_XON_MAC_TH, data_xon_thr);
		EFX_SET_OWORD_FIELD(reg, FRF_BZ_RX_XOFF_MAC_TH, data_xoff_thr);
		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);
	}
	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.
 */
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);

	/* Set the source of the GMAC clock */
	if (falcon_rev(efx) == FALCON_REV_B0) {
		efx_reado(efx, &temp, FR_AB_GPIO_CTL);
		EFX_SET_OWORD_FIELD(temp, FRF_AB_USE_NIC_CLK, true);
		efx_writeo(efx, &temp, FR_AB_GPIO_CTL);
	}

	/* Select the correct MAC */
	falcon_clock_mac(efx);

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

	/* Set positions of descriptor caches in SRAM. */
	EFX_POPULATE_OWORD_1(temp, FRF_AZ_SRM_TX_DC_BASE_ADR, TX_DC_BASE / 8);
	efx_writeo(efx, &temp, FR_AZ_SRM_TX_DC_CFG);
	EFX_POPULATE_OWORD_1(temp, FRF_AZ_SRM_RX_DC_BASE_ADR, RX_DC_BASE / 8);
	efx_writeo(efx, &temp, FR_AZ_SRM_RX_DC_CFG);

	/* Set TX descriptor cache size. */
	BUILD_BUG_ON(TX_DC_ENTRIES != (8 << TX_DC_ENTRIES_ORDER));
	EFX_POPULATE_OWORD_1(temp, FRF_AZ_TX_DC_SIZE, TX_DC_ENTRIES_ORDER);
	efx_writeo(efx, &temp, FR_AZ_TX_DC_CFG);

	/* Set RX descriptor cache size.  Set low watermark to size-8, as
	 * this allows most efficient prefetching.
	 */
	BUILD_BUG_ON(RX_DC_ENTRIES != (8 << RX_DC_ENTRIES_ORDER));
	EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_SIZE, RX_DC_ENTRIES_ORDER);
	efx_writeo(efx, &temp, FR_AZ_RX_DC_CFG);
	EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_PF_LWM, RX_DC_ENTRIES - 8);
	efx_writeo(efx, &temp, FR_AZ_RX_DC_PF_WM);

	/* 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);
	}

	/* Enable all the genuinely fatal interrupts.  (They are still
	 * masked by the overall interrupt mask, controlled by
	 * falcon_interrupts()).
	 *
	 * Note: All other fatal interrupts are enabled
	 */
	EFX_POPULATE_OWORD_3(temp,
			     FRF_AZ_ILL_ADR_INT_KER_EN, 1,
			     FRF_AZ_RBUF_OWN_INT_KER_EN, 1,
			     FRF_AZ_TBUF_OWN_INT_KER_EN, 1);
	EFX_INVERT_OWORD(temp);
	efx_writeo(efx, &temp, FR_AZ_FATAL_INTR_KER);

	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);
	}

	falcon_setup_rss_indir_table(efx);

	/* 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);

	/* Disable the ugly timer-based TX DMA backoff and allow TX DMA to be
	 * controlled by the RX FIFO fill level. Set arbitration to one pkt/Q.
	 */
	efx_reado(efx, &temp, FR_AZ_TX_RESERVED);
	EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER, 0xfe);
	EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER_EN, 1);
	EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_ONE_PKT_PER_Q, 1);
	EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PUSH_EN, 0);
	EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_DIS_NON_IP_EV, 1);
	/* Enable SW_EV to inherit in char driver - assume harmless here */
	EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_SOFT_EVT_EN, 1);
	/* Prefetch threshold 2 => fetch when descriptor cache half empty */
	EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_THRESHOLD, 2);
	/* Squash TX of packets of 16 bytes or less */
	if (falcon_rev(efx) >= FALCON_REV_B0 && EFX_WORKAROUND_9141(efx))
		EFX_SET_OWORD_FIELD(temp, FRF_BZ_TX_FLUSH_MIN_LEN_EN, 1);
	efx_writeo(efx, &temp, FR_AZ_TX_RESERVED);

	/* 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);

	/* Set destination of both TX and RX Flush events */
	if (falcon_rev(efx) >= FALCON_REV_B0) {
		EFX_POPULATE_OWORD_1(temp, FRF_BZ_FLS_EVQ_ID, 0);
		efx_writeo(efx, &temp, FR_BZ_DP_CTRL);
	}

	return 0;
}

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

	board->type->fini(efx);

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

	falcon_remove_spi_devices(efx);
	falcon_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;
}

void falcon_update_nic_stats(struct efx_nic *efx)
{
	struct falcon_nic_data *nic_data = efx->nic_data;
	efx_oword_t cnt;

	if (nic_data->stats_disable_count)
		return;

	efx_reado(efx, &cnt, FR_AZ_RX_NODESC_DROP);
	efx->n_rx_nodesc_drop_cnt +=
		EFX_OWORD_FIELD(cnt, FRF_AB_RX_NODESC_DROP_CNT);

	if (nic_data->stats_pending &&
	    *nic_data->stats_dma_done == FALCON_STATS_DONE) {
		nic_data->stats_pending = false;
		rmb(); /* read the done flag before the stats */
		efx->mac_op->update_stats(efx);
	}
}

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);
}

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 (*nic_data->stats_dma_done == FALCON_STATS_DONE)
			break;
		msleep(1);
	}

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

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

struct efx_nic_type falcon_a_nic_type = {
	.mem_map_size = 0x20000,
	.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,
	.max_interrupt_mode = EFX_INT_MODE_MSI,
	.phys_addr_channels = 4,
};

struct efx_nic_type falcon_b_nic_type = {
	/* Map everything up to and including the RSS indirection
	 * table.  Don't map MSI-X table, MSI-X PBA since Linux
	 * requires that they not be mapped.  */
	.mem_map_size = (FR_BZ_RX_INDIRECTION_TBL +
			 FR_BZ_RX_INDIRECTION_TBL_STEP *
			 FR_BZ_RX_INDIRECTION_TBL_ROWS),
	.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_buffer_padding = 0,
	.max_interrupt_mode = EFX_INT_MODE_MSIX,
	.phys_addr_channels = 32, /* Hardware limit is 64, but the legacy
				   * interrupt handler only supports 32
				   * channels */
};