drivers/net/sfc/mtd.c - kernel/msm-4.9 - Gitiles

 /****************************************************************************
  * 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/module.h>
 #include <linux/mtd/mtd.h>
 #include <linux/delay.h>
 #include <linux/rtnetlink.h>

 #define EFX_DRIVER_NAME "sfc_mtd"
 #include "net_driver.h"
 #include "spi.h"
 #include "efx.h"
 #include "falcon.h"

 #define EFX_SPI_VERIFY_BUF_LEN 16

 struct efx_mtd_partition {
 	struct mtd_info mtd;
 	size_t offset;
 	const char *type_name;
 	char name[IFNAMSIZ + 20];
 };

 struct efx_mtd_ops {
 	int (*read)(struct mtd_info *mtd, loff_t start, size_t len,
 		    size_t *retlen, u8 *buffer);
 	int (*erase)(struct mtd_info *mtd, loff_t start, size_t len);
 	int (*write)(struct mtd_info *mtd, loff_t start, size_t len,
 		     size_t *retlen, const u8 *buffer);
 	int (*sync)(struct mtd_info *mtd);
 };

 struct efx_mtd {
 	struct list_head node;
 	struct efx_nic *efx;
 	const struct efx_spi_device *spi;
 	const char *name;
 	const struct efx_mtd_ops *ops;
 	size_t n_parts;
 	struct efx_mtd_partition part[0];
 };

 #define efx_for_each_partition(part, efx_mtd)			\
 	for ((part) = &(efx_mtd)->part[0];			\
 	     (part) != &(efx_mtd)->part[(efx_mtd)->n_parts];	\
 	     (part)++)

 #define to_efx_mtd_partition(mtd)				\
 	container_of(mtd, struct efx_mtd_partition, mtd)

 static int falcon_mtd_probe(struct efx_nic *efx);

 /* SPI utilities */

 static int efx_spi_slow_wait(struct efx_mtd *efx_mtd, bool uninterruptible)
 {
 	const struct efx_spi_device *spi = efx_mtd->spi;
 	struct efx_nic *efx = efx_mtd->efx;
 	u8 status;
 	int rc, i;

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

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

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

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

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

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

 	return 0;
 }

 static int efx_spi_erase(struct efx_mtd *efx_mtd, loff_t start, size_t len)
 {
 	const struct efx_spi_device *spi = efx_mtd->spi;
 	struct efx_nic *efx = efx_mtd->efx;
 	unsigned pos, block_len;
 	u8 empty[EFX_SPI_VERIFY_BUF_LEN];
 	u8 buffer[EFX_SPI_VERIFY_BUF_LEN];
 	int rc;

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

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

 	rc = efx_spi_unlock(efx, spi);
 	if (rc)
 		return rc;
 	rc = falcon_spi_cmd(efx, spi, SPI_WREN, -1, NULL, NULL, 0);
 	if (rc)
 		return rc;
 	rc = falcon_spi_cmd(efx, spi, spi->erase_command, start, NULL,
 			    NULL, 0);
 	if (rc)
 		return rc;
 	rc = efx_spi_slow_wait(efx_mtd, false);

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

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

 	return rc;
 }

 /* MTD interface */

 static int efx_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
 {
 	struct efx_mtd *efx_mtd = mtd->priv;
 	int rc;

 	rc = efx_mtd->ops->erase(mtd, erase->addr, erase->len);
 	if (rc == 0) {
 		erase->state = MTD_ERASE_DONE;
 	} else {
 		erase->state = MTD_ERASE_FAILED;
 		erase->fail_addr = 0xffffffff;
 	}
 	mtd_erase_callback(erase);
 	return rc;
 }

 static void efx_mtd_sync(struct mtd_info *mtd)
 {
 	struct efx_mtd *efx_mtd = mtd->priv;
 	struct efx_nic *efx = efx_mtd->efx;
 	int rc;

 	rc = efx_mtd->ops->sync(mtd);
 	if (rc)
 		EFX_ERR(efx, "%s sync failed (%d)\n", efx_mtd->name, rc);
 }

 static void efx_mtd_remove_partition(struct efx_mtd_partition *part)
 {
 	int rc;

 	for (;;) {
 		rc = del_mtd_device(&part->mtd);
 		if (rc != -EBUSY)
 			break;
 		ssleep(1);
 	}
 	WARN_ON(rc);
 }

 static void efx_mtd_remove_device(struct efx_mtd *efx_mtd)
 {
 	struct efx_mtd_partition *part;

 	efx_for_each_partition(part, efx_mtd)
 		efx_mtd_remove_partition(part);
 	list_del(&efx_mtd->node);
 	kfree(efx_mtd);
 }

 static void efx_mtd_rename_device(struct efx_mtd *efx_mtd)
 {
 	struct efx_mtd_partition *part;

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

 static int efx_mtd_probe_device(struct efx_nic *efx, struct efx_mtd *efx_mtd)
 {
 	struct efx_mtd_partition *part;

 	efx_mtd->efx = efx;

 	efx_mtd_rename_device(efx_mtd);

 	efx_for_each_partition(part, efx_mtd) {
 		part->mtd.writesize = 1;

 		part->mtd.owner = THIS_MODULE;
 		part->mtd.priv = efx_mtd;
 		part->mtd.name = part->name;
 		part->mtd.erase = efx_mtd_erase;
 		part->mtd.read = efx_mtd->ops->read;
 		part->mtd.write = efx_mtd->ops->write;
 		part->mtd.sync = efx_mtd_sync;

 		if (add_mtd_device(&part->mtd))
 			goto fail;
 	}

 	list_add(&efx_mtd->node, &efx->mtd_list);
 	return 0;

 fail:
 	while (part != &efx_mtd->part[0]) {
 		--part;
 		efx_mtd_remove_partition(part);
 	}
 	/* add_mtd_device() returns 1 if the MTD table is full */
 	return -ENOMEM;
 }

 void efx_mtd_remove(struct efx_nic *efx)
 {
 	struct efx_mtd *efx_mtd, *next;

 	WARN_ON(efx_dev_registered(efx));

 	list_for_each_entry_safe(efx_mtd, next, &efx->mtd_list, node)
 		efx_mtd_remove_device(efx_mtd);
 }

 void efx_mtd_rename(struct efx_nic *efx)
 {
 	struct efx_mtd *efx_mtd;

 	ASSERT_RTNL();

 	list_for_each_entry(efx_mtd, &efx->mtd_list, node)
 		efx_mtd_rename_device(efx_mtd);
 }

 int efx_mtd_probe(struct efx_nic *efx)
 {
 	return falcon_mtd_probe(efx);
 }

 /* Implementation of MTD operations for Falcon */

 static int falcon_mtd_read(struct mtd_info *mtd, loff_t start,
 			   size_t len, size_t *retlen, u8 *buffer)
 {
 	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
 	struct efx_mtd *efx_mtd = mtd->priv;
 	const struct efx_spi_device *spi = efx_mtd->spi;
 	struct efx_nic *efx = efx_mtd->efx;
 	int rc;

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

 static int falcon_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
 {
 	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
 	struct efx_mtd *efx_mtd = mtd->priv;
 	struct efx_nic *efx = efx_mtd->efx;
 	int rc;

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

 static int falcon_mtd_write(struct mtd_info *mtd, loff_t start,
 			    size_t len, size_t *retlen, const u8 *buffer)
 {
 	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
 	struct efx_mtd *efx_mtd = mtd->priv;
 	const struct efx_spi_device *spi = efx_mtd->spi;
 	struct efx_nic *efx = efx_mtd->efx;
 	int rc;

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

 static int falcon_mtd_sync(struct mtd_info *mtd)
 {
 	struct efx_mtd *efx_mtd = mtd->priv;
 	struct efx_nic *efx = efx_mtd->efx;
 	int rc;

 	mutex_lock(&efx->spi_lock);
 	rc = efx_spi_slow_wait(efx_mtd, true);
 	mutex_unlock(&efx->spi_lock);
 	return rc;
 }

 static struct efx_mtd_ops falcon_mtd_ops = {
 	.read	= falcon_mtd_read,
 	.erase	= falcon_mtd_erase,
 	.write	= falcon_mtd_write,
 	.sync	= falcon_mtd_sync,
 };

 static int falcon_mtd_probe(struct efx_nic *efx)
 {
 	struct efx_spi_device *spi = efx->spi_flash;
 	struct efx_mtd *efx_mtd;
 	int rc;

 	ASSERT_RTNL();

 	if (!spi || spi->size <= FALCON_FLASH_BOOTCODE_START)
 		return -ENODEV;

 	efx_mtd = kzalloc(sizeof(*efx_mtd) + sizeof(efx_mtd->part[0]),
 			  GFP_KERNEL);
 	if (!efx_mtd)
 		return -ENOMEM;

 	efx_mtd->spi = spi;
 	efx_mtd->name = "flash";
 	efx_mtd->ops = &falcon_mtd_ops;

 	efx_mtd->n_parts = 1;
 	efx_mtd->part[0].mtd.type = MTD_NORFLASH;
 	efx_mtd->part[0].mtd.flags = MTD_CAP_NORFLASH;
 	efx_mtd->part[0].mtd.size = spi->size - FALCON_FLASH_BOOTCODE_START;
 	efx_mtd->part[0].mtd.erasesize = spi->erase_size;
 	efx_mtd->part[0].offset = FALCON_FLASH_BOOTCODE_START;
 	efx_mtd->part[0].type_name = "sfc_flash_bootrom";

 	rc = efx_mtd_probe_device(efx, efx_mtd);
 	if (rc)
 		kfree(efx_mtd);
 	return rc;
 }
	/****************************************************************************
	* 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/module.h>
	#include <linux/mtd/mtd.h>
	#include <linux/delay.h>
	#include <linux/rtnetlink.h>

	#define EFX_DRIVER_NAME "sfc_mtd"
	#include "net_driver.h"
	#include "spi.h"
	#include "efx.h"
	#include "falcon.h"

	#define EFX_SPI_VERIFY_BUF_LEN 16

	struct efx_mtd_partition {
	struct mtd_info mtd;
	size_t offset;
	const char *type_name;
	char name[IFNAMSIZ + 20];
	};

	struct efx_mtd_ops {
	int (read)(struct mtd_info mtd, loff_t start, size_t len,
	size_t retlen, u8 buffer);
	int (erase)(struct mtd_info mtd, loff_t start, size_t len);
	int (write)(struct mtd_info mtd, loff_t start, size_t len,
	size_t retlen, const u8 buffer);
	int (sync)(struct mtd_info mtd);
	};

	struct efx_mtd {
	struct list_head node;
	struct efx_nic *efx;
	const struct efx_spi_device *spi;
	const char *name;
	const struct efx_mtd_ops *ops;
	size_t n_parts;
	struct efx_mtd_partition part[0];
	};

	#define efx_for_each_partition(part, efx_mtd) \
	for ((part) = &(efx_mtd)->part[0]; \
	(part) != &(efx_mtd)->part[(efx_mtd)->n_parts]; \
	(part)++)

	#define to_efx_mtd_partition(mtd) \
	container_of(mtd, struct efx_mtd_partition, mtd)

	static int falcon_mtd_probe(struct efx_nic *efx);

	/* SPI utilities */

	static int efx_spi_slow_wait(struct efx_mtd *efx_mtd, bool uninterruptible)
	{
	const struct efx_spi_device *spi = efx_mtd->spi;
	struct efx_nic *efx = efx_mtd->efx;
	u8 status;
	int rc, i;

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

	static int
	efx_spi_unlock(struct efx_nic efx, const struct efx_spi_device spi)
	{
	const u8 unlock_mask = (SPI_STATUS_BP2 \| SPI_STATUS_BP1 \|
	SPI_STATUS_BP0);
	u8 status;
	int rc;

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

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

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

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

	return 0;
	}

	static int efx_spi_erase(struct efx_mtd *efx_mtd, loff_t start, size_t len)
	{
	const struct efx_spi_device *spi = efx_mtd->spi;
	struct efx_nic *efx = efx_mtd->efx;
	unsigned pos, block_len;
	u8 empty[EFX_SPI_VERIFY_BUF_LEN];
	u8 buffer[EFX_SPI_VERIFY_BUF_LEN];
	int rc;

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

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

	rc = efx_spi_unlock(efx, spi);
	if (rc)
	return rc;
	rc = falcon_spi_cmd(efx, spi, SPI_WREN, -1, NULL, NULL, 0);
	if (rc)
	return rc;
	rc = falcon_spi_cmd(efx, spi, spi->erase_command, start, NULL,
	NULL, 0);
	if (rc)
	return rc;
	rc = efx_spi_slow_wait(efx_mtd, false);

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

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

	return rc;
	}

	/* MTD interface */

	static int efx_mtd_erase(struct mtd_info mtd, struct erase_info erase)
	{
	struct efx_mtd *efx_mtd = mtd->priv;
	int rc;

	rc = efx_mtd->ops->erase(mtd, erase->addr, erase->len);
	if (rc == 0) {
	erase->state = MTD_ERASE_DONE;
	} else {
	erase->state = MTD_ERASE_FAILED;
	erase->fail_addr = 0xffffffff;
	}
	mtd_erase_callback(erase);
	return rc;
	}

	static void efx_mtd_sync(struct mtd_info *mtd)
	{
	struct efx_mtd *efx_mtd = mtd->priv;
	struct efx_nic *efx = efx_mtd->efx;
	int rc;

	rc = efx_mtd->ops->sync(mtd);
	if (rc)
	EFX_ERR(efx, "%s sync failed (%d)\n", efx_mtd->name, rc);
	}

	static void efx_mtd_remove_partition(struct efx_mtd_partition *part)
	{
	int rc;

	for (;;) {
	rc = del_mtd_device(&part->mtd);
	if (rc != -EBUSY)
	break;
	ssleep(1);
	}
	WARN_ON(rc);
	}

	static void efx_mtd_remove_device(struct efx_mtd *efx_mtd)
	{
	struct efx_mtd_partition *part;

	efx_for_each_partition(part, efx_mtd)
	efx_mtd_remove_partition(part);
	list_del(&efx_mtd->node);
	kfree(efx_mtd);
	}

	static void efx_mtd_rename_device(struct efx_mtd *efx_mtd)
	{
	struct efx_mtd_partition *part;

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

	static int efx_mtd_probe_device(struct efx_nic efx, struct efx_mtd efx_mtd)
	{
	struct efx_mtd_partition *part;

	efx_mtd->efx = efx;

	efx_mtd_rename_device(efx_mtd);

	efx_for_each_partition(part, efx_mtd) {
	part->mtd.writesize = 1;

	part->mtd.owner = THIS_MODULE;
	part->mtd.priv = efx_mtd;
	part->mtd.name = part->name;
	part->mtd.erase = efx_mtd_erase;
	part->mtd.read = efx_mtd->ops->read;
	part->mtd.write = efx_mtd->ops->write;
	part->mtd.sync = efx_mtd_sync;

	if (add_mtd_device(&part->mtd))
	goto fail;
	}

	list_add(&efx_mtd->node, &efx->mtd_list);
	return 0;

	fail:
	while (part != &efx_mtd->part[0]) {
	--part;
	efx_mtd_remove_partition(part);
	}
	/* add_mtd_device() returns 1 if the MTD table is full */
	return -ENOMEM;
	}

	void efx_mtd_remove(struct efx_nic *efx)
	{
	struct efx_mtd efx_mtd, next;

	WARN_ON(efx_dev_registered(efx));

	list_for_each_entry_safe(efx_mtd, next, &efx->mtd_list, node)
	efx_mtd_remove_device(efx_mtd);
	}

	void efx_mtd_rename(struct efx_nic *efx)
	{
	struct efx_mtd *efx_mtd;

	ASSERT_RTNL();

	list_for_each_entry(efx_mtd, &efx->mtd_list, node)
	efx_mtd_rename_device(efx_mtd);
	}

	int efx_mtd_probe(struct efx_nic *efx)
	{
	return falcon_mtd_probe(efx);
	}

	/* Implementation of MTD operations for Falcon */

	static int falcon_mtd_read(struct mtd_info *mtd, loff_t start,
	size_t len, size_t retlen, u8 buffer)
	{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	const struct efx_spi_device *spi = efx_mtd->spi;
	struct efx_nic *efx = efx_mtd->efx;
	int rc;

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

	static int falcon_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
	{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	struct efx_nic *efx = efx_mtd->efx;
	int rc;

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

	static int falcon_mtd_write(struct mtd_info *mtd, loff_t start,
	size_t len, size_t retlen, const u8 buffer)
	{
	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
	struct efx_mtd *efx_mtd = mtd->priv;
	const struct efx_spi_device *spi = efx_mtd->spi;
	struct efx_nic *efx = efx_mtd->efx;
	int rc;

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

	static int falcon_mtd_sync(struct mtd_info *mtd)
	{
	struct efx_mtd *efx_mtd = mtd->priv;
	struct efx_nic *efx = efx_mtd->efx;
	int rc;

	mutex_lock(&efx->spi_lock);
	rc = efx_spi_slow_wait(efx_mtd, true);
	mutex_unlock(&efx->spi_lock);
	return rc;
	}

	static struct efx_mtd_ops falcon_mtd_ops = {
	.read = falcon_mtd_read,
	.erase = falcon_mtd_erase,
	.write = falcon_mtd_write,
	.sync = falcon_mtd_sync,
	};

	static int falcon_mtd_probe(struct efx_nic *efx)
	{
	struct efx_spi_device *spi = efx->spi_flash;
	struct efx_mtd *efx_mtd;
	int rc;

	ASSERT_RTNL();

	if (!spi \|\| spi->size <= FALCON_FLASH_BOOTCODE_START)
	return -ENODEV;

	efx_mtd = kzalloc(sizeof(*efx_mtd) + sizeof(efx_mtd->part[0]),
	GFP_KERNEL);
	if (!efx_mtd)
	return -ENOMEM;

	efx_mtd->spi = spi;
	efx_mtd->name = "flash";
	efx_mtd->ops = &falcon_mtd_ops;

	efx_mtd->n_parts = 1;
	efx_mtd->part[0].mtd.type = MTD_NORFLASH;
	efx_mtd->part[0].mtd.flags = MTD_CAP_NORFLASH;
	efx_mtd->part[0].mtd.size = spi->size - FALCON_FLASH_BOOTCODE_START;
	efx_mtd->part[0].mtd.erasesize = spi->erase_size;
	efx_mtd->part[0].offset = FALCON_FLASH_BOOTCODE_START;
	efx_mtd->part[0].type_name = "sfc_flash_bootrom";

	rc = efx_mtd_probe_device(efx, efx_mtd);
	if (rc)
	kfree(efx_mtd);
	return rc;
	}