[deliverable/linux.git] / drivers / net / sfc / mtd.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/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 "nic.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;
}
Commit	Line	Data
f4150724 BH	1	/****************************************************************************
	2	* Driver for Solarflare Solarstorm network controllers and boards
	3	* Copyright 2005-2006 Fen Systems Ltd.
	4	* Copyright 2006-2008 Solarflare Communications Inc.
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License version 2 as published
	8	* by the Free Software Foundation, incorporated herein by reference.
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/mtd/mtd.h>
	13	#include <linux/delay.h>
76884835	14	#include <linux/rtnetlink.h>
f4150724 BH	15
	16	#define EFX_DRIVER_NAME "sfc_mtd"
	17	#include "net_driver.h"
	18	#include "spi.h"
ff2ef902	19	#include "efx.h"
744093c9	20	#include "nic.h"
f4150724 BH	21
	22	#define EFX_SPI_VERIFY_BUF_LEN 16
	23
76884835	24	struct efx_mtd_partition {
f4150724	25	struct mtd_info mtd;
76884835 BH	26	size_t offset;
76884835 BH	27	const char *type_name;
f4150724 BH	28	char name[IFNAMSIZ + 20];
	29	};
	30
76884835 BH	31	struct efx_mtd_ops {
	32	int (read)(struct mtd_info mtd, loff_t start, size_t len,
	33	size_t retlen, u8 buffer);
	34	int (erase)(struct mtd_info mtd, loff_t start, size_t len);
	35	int (write)(struct mtd_info mtd, loff_t start, size_t len,
	36	size_t retlen, const u8 buffer);
	37	int (sync)(struct mtd_info mtd);
	38	};
	39
	40	struct efx_mtd {
	41	struct list_head node;
	42	struct efx_nic *efx;
	43	const struct efx_spi_device *spi;
	44	const char *name;
	45	const struct efx_mtd_ops *ops;
	46	size_t n_parts;
	47	struct efx_mtd_partition part[0];
	48	};
	49
	50	#define efx_for_each_partition(part, efx_mtd) \
	51	for ((part) = &(efx_mtd)->part[0]; \
	52	(part) != &(efx_mtd)->part[(efx_mtd)->n_parts]; \
	53	(part)++)
	54
	55	#define to_efx_mtd_partition(mtd) \
	56	container_of(mtd, struct efx_mtd_partition, mtd)
	57
	58	static int falcon_mtd_probe(struct efx_nic *efx);
	59
f4150724 BH	60	/* SPI utilities */
	61
	62	static int efx_spi_slow_wait(struct efx_mtd *efx_mtd, bool uninterruptible)
	63	{
	64	const struct efx_spi_device *spi = efx_mtd->spi;
76884835	65	struct efx_nic *efx = efx_mtd->efx;
f4150724 BH	66	u8 status;
	67	int rc, i;
	68
	69	/* Wait up to 4s for flash/EEPROM to finish a slow operation. */
	70	for (i = 0; i < 40; i++) {
	71	__set_current_state(uninterruptible ?
	72	TASK_UNINTERRUPTIBLE : TASK_INTERRUPTIBLE);
	73	schedule_timeout(HZ / 10);
76884835	74	rc = falcon_spi_cmd(efx, spi, SPI_RDSR, -1, NULL,
f4150724 BH	75	&status, sizeof(status));
	76	if (rc)
	77	return rc;
	78	if (!(status & SPI_STATUS_NRDY))
	79	return 0;
	80	if (signal_pending(current))
	81	return -EINTR;
	82	}
	83	EFX_ERR(efx, "timed out waiting for %s\n", efx_mtd->name);
	84	return -ETIMEDOUT;
	85	}
	86
76884835 BH	87	static int
76884835 BH	88	efx_spi_unlock(struct efx_nic efx, const struct efx_spi_device spi)
f4150724 BH	89	{
	90	const u8 unlock_mask = (SPI_STATUS_BP2 \| SPI_STATUS_BP1 \|
	91	SPI_STATUS_BP0);
	92	u8 status;
	93	int rc;
	94
76884835 BH	95	rc = falcon_spi_cmd(efx, spi, SPI_RDSR, -1, NULL,
76884835 BH	96	&status, sizeof(status));
f4150724 BH	97	if (rc)
	98	return rc;
	99
	100	if (!(status & unlock_mask))
	101	return 0; /* already unlocked */
	102
76884835	103	rc = falcon_spi_cmd(efx, spi, SPI_WREN, -1, NULL, NULL, 0);
f4150724 BH	104	if (rc)
f4150724 BH	105	return rc;
76884835	106	rc = falcon_spi_cmd(efx, spi, SPI_SST_EWSR, -1, NULL, NULL, 0);
f4150724 BH	107	if (rc)
	108	return rc;
	109
	110	status &= ~unlock_mask;
76884835 BH	111	rc = falcon_spi_cmd(efx, spi, SPI_WRSR, -1, &status,
76884835 BH	112	NULL, sizeof(status));
f4150724 BH	113	if (rc)
f4150724 BH	114	return rc;
76884835	115	rc = falcon_spi_wait_write(efx, spi);
f4150724 BH	116	if (rc)
	117	return rc;
	118
	119	return 0;
	120	}
	121
	122	static int efx_spi_erase(struct efx_mtd *efx_mtd, loff_t start, size_t len)
	123	{
	124	const struct efx_spi_device *spi = efx_mtd->spi;
76884835	125	struct efx_nic *efx = efx_mtd->efx;
f4150724 BH	126	unsigned pos, block_len;
	127	u8 empty[EFX_SPI_VERIFY_BUF_LEN];
	128	u8 buffer[EFX_SPI_VERIFY_BUF_LEN];
	129	int rc;
	130
	131	if (len != spi->erase_size)
	132	return -EINVAL;
	133
	134	if (spi->erase_command == 0)
	135	return -EOPNOTSUPP;
	136
76884835	137	rc = efx_spi_unlock(efx, spi);
f4150724 BH	138	if (rc)
f4150724 BH	139	return rc;
76884835	140	rc = falcon_spi_cmd(efx, spi, SPI_WREN, -1, NULL, NULL, 0);
f4150724 BH	141	if (rc)
f4150724 BH	142	return rc;
76884835 BH	143	rc = falcon_spi_cmd(efx, spi, spi->erase_command, start, NULL,
76884835 BH	144	NULL, 0);
f4150724 BH	145	if (rc)
	146	return rc;
	147	rc = efx_spi_slow_wait(efx_mtd, false);
	148
	149	/* Verify the entire region has been wiped */
	150	memset(empty, 0xff, sizeof(empty));
	151	for (pos = 0; pos < len; pos += block_len) {
	152	block_len = min(len - pos, sizeof(buffer));
76884835 BH	153	rc = falcon_spi_read(efx, spi, start + pos, block_len,
76884835 BH	154	NULL, buffer);
f4150724 BH	155	if (rc)
	156	return rc;
	157	if (memcmp(empty, buffer, block_len))
	158	return -EIO;
	159
	160	/* Avoid locking up the system */
	161	cond_resched();
	162	if (signal_pending(current))
	163	return -EINTR;
	164	}
	165
	166	return rc;
	167	}
	168
	169	/* MTD interface */
	170
76884835 BH	171	static int efx_mtd_erase(struct mtd_info mtd, struct erase_info erase)
	172	{
	173	struct efx_mtd *efx_mtd = mtd->priv;
	174	int rc;
	175
	176	rc = efx_mtd->ops->erase(mtd, erase->addr, erase->len);
	177	if (rc == 0) {
	178	erase->state = MTD_ERASE_DONE;
	179	} else {
	180	erase->state = MTD_ERASE_FAILED;
	181	erase->fail_addr = 0xffffffff;
	182	}
	183	mtd_erase_callback(erase);
	184	return rc;
	185	}
	186
	187	static void efx_mtd_sync(struct mtd_info *mtd)
	188	{
	189	struct efx_mtd *efx_mtd = mtd->priv;
	190	struct efx_nic *efx = efx_mtd->efx;
	191	int rc;
	192
	193	rc = efx_mtd->ops->sync(mtd);
	194	if (rc)
	195	EFX_ERR(efx, "%s sync failed (%d)\n", efx_mtd->name, rc);
	196	}
	197
	198	static void efx_mtd_remove_partition(struct efx_mtd_partition *part)
	199	{
	200	int rc;
	201
	202	for (;;) {
	203	rc = del_mtd_device(&part->mtd);
	204	if (rc != -EBUSY)
	205	break;
	206	ssleep(1);
	207	}
	208	WARN_ON(rc);
	209	}
	210
	211	static void efx_mtd_remove_device(struct efx_mtd *efx_mtd)
	212	{
	213	struct efx_mtd_partition *part;
	214
	215	efx_for_each_partition(part, efx_mtd)
	216	efx_mtd_remove_partition(part);
	217	list_del(&efx_mtd->node);
	218	kfree(efx_mtd);
	219	}
	220
	221	static void efx_mtd_rename_device(struct efx_mtd *efx_mtd)
	222	{
	223	struct efx_mtd_partition *part;
	224
	225	efx_for_each_partition(part, efx_mtd)
	226	snprintf(part->name, sizeof(part->name),
	227	"%s %s", efx_mtd->efx->name,
	228	part->type_name);
	229	}
	230
	231	static int efx_mtd_probe_device(struct efx_nic efx, struct efx_mtd efx_mtd)
	232	{
	233	struct efx_mtd_partition *part;
	234
235	efx_mtd->efx = efx;
236
237	efx_mtd_rename_device(efx_mtd);
238
239	efx_for_each_partition(part, efx_mtd) {
240	part->mtd.writesize = 1;
241
242	part->mtd.owner = THIS_MODULE;
243	part->mtd.priv = efx_mtd;
244	part->mtd.name = part->name;
245	part->mtd.erase = efx_mtd_erase;
246	part->mtd.read = efx_mtd->ops->read;
247	part->mtd.write = efx_mtd->ops->write;
248	part->mtd.sync = efx_mtd_sync;
249
250	if (add_mtd_device(&part->mtd))
251	goto fail;
252	}
253
254	list_add(&efx_mtd->node, &efx->mtd_list);
255	return 0;
256
257	fail:
258	while (part != &efx_mtd->part[0]) {
259	--part;
260	efx_mtd_remove_partition(part);
261	}
262	/* add_mtd_device() returns 1 if the MTD table is full */
263	return -ENOMEM;
264	}
265
266	void efx_mtd_remove(struct efx_nic *efx)
f4150724	267	{
76884835 BH	268	struct efx_mtd efx_mtd, next;
	269
	270	WARN_ON(efx_dev_registered(efx));
	271
	272	list_for_each_entry_safe(efx_mtd, next, &efx->mtd_list, node)
	273	efx_mtd_remove_device(efx_mtd);
	274	}
	275
	276	void efx_mtd_rename(struct efx_nic *efx)
	277	{
	278	struct efx_mtd *efx_mtd;
	279
	280	ASSERT_RTNL();
	281
	282	list_for_each_entry(efx_mtd, &efx->mtd_list, node)
	283	efx_mtd_rename_device(efx_mtd);
	284	}
	285
	286	int efx_mtd_probe(struct efx_nic *efx)
	287	{
	288	return falcon_mtd_probe(efx);
	289	}
	290
	291	/* Implementation of MTD operations for Falcon */
	292
	293	static int falcon_mtd_read(struct mtd_info *mtd, loff_t start,
	294	size_t len, size_t retlen, u8 buffer)
	295	{
	296	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
f4150724 BH	297	struct efx_mtd *efx_mtd = mtd->priv;
f4150724 BH	298	const struct efx_spi_device *spi = efx_mtd->spi;
76884835	299	struct efx_nic *efx = efx_mtd->efx;
f4150724 BH	300	int rc;
	301
	302	rc = mutex_lock_interruptible(&efx->spi_lock);
	303	if (rc)
	304	return rc;
76884835 BH	305	rc = falcon_spi_read(efx, spi, part->offset + start, len,
76884835 BH	306	retlen, buffer);
f4150724 BH	307	mutex_unlock(&efx->spi_lock);
	308	return rc;
	309	}
	310
76884835	311	static int falcon_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
f4150724	312	{
76884835	313	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
f4150724	314	struct efx_mtd *efx_mtd = mtd->priv;
76884835	315	struct efx_nic *efx = efx_mtd->efx;
f4150724 BH	316	int rc;
	317
	318	rc = mutex_lock_interruptible(&efx->spi_lock);
	319	if (rc)
	320	return rc;
76884835	321	rc = efx_spi_erase(efx_mtd, part->offset + start, len);
f4150724	322	mutex_unlock(&efx->spi_lock);
f4150724 BH	323	return rc;
	324	}
	325
76884835 BH	326	static int falcon_mtd_write(struct mtd_info *mtd, loff_t start,
76884835 BH	327	size_t len, size_t retlen, const u8 buffer)
f4150724	328	{
76884835	329	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
f4150724 BH	330	struct efx_mtd *efx_mtd = mtd->priv;
f4150724 BH	331	const struct efx_spi_device *spi = efx_mtd->spi;
76884835	332	struct efx_nic *efx = efx_mtd->efx;
f4150724 BH	333	int rc;
	334
	335	rc = mutex_lock_interruptible(&efx->spi_lock);
	336	if (rc)
	337	return rc;
76884835 BH	338	rc = falcon_spi_write(efx, spi, part->offset + start, len,
76884835 BH	339	retlen, buffer);
f4150724 BH	340	mutex_unlock(&efx->spi_lock);
	341	return rc;
	342	}
	343
76884835	344	static int falcon_mtd_sync(struct mtd_info *mtd)
f4150724 BH	345	{
f4150724 BH	346	struct efx_mtd *efx_mtd = mtd->priv;
76884835	347	struct efx_nic *efx = efx_mtd->efx;
f4150724 BH	348	int rc;
	349
	350	mutex_lock(&efx->spi_lock);
	351	rc = efx_spi_slow_wait(efx_mtd, true);
	352	mutex_unlock(&efx->spi_lock);
76884835	353	return rc;
f4150724 BH	354	}
f4150724 BH	355
76884835 BH	356	static struct efx_mtd_ops falcon_mtd_ops = {
	357	.read = falcon_mtd_read,
	358	.erase = falcon_mtd_erase,
	359	.write = falcon_mtd_write,
	360	.sync = falcon_mtd_sync,
	361	};
f4150724	362
76884835	363	static int falcon_mtd_probe(struct efx_nic *efx)
f4150724 BH	364	{
	365	struct efx_spi_device *spi = efx->spi_flash;
	366	struct efx_mtd *efx_mtd;
76884835 BH	367	int rc;
	368
	369	ASSERT_RTNL();
f4150724 BH	370
	371	if (!spi \|\| spi->size <= FALCON_FLASH_BOOTCODE_START)
	372	return -ENODEV;
	373
76884835 BH	374	efx_mtd = kzalloc(sizeof(*efx_mtd) + sizeof(efx_mtd->part[0]),
76884835 BH	375	GFP_KERNEL);
f4150724 BH	376	if (!efx_mtd)
	377	return -ENOMEM;
	378
	379	efx_mtd->spi = spi;
76884835 BH	380	efx_mtd->name = "flash";
	381	efx_mtd->ops = &falcon_mtd_ops;
	382
	383	efx_mtd->n_parts = 1;
	384	efx_mtd->part[0].mtd.type = MTD_NORFLASH;
	385	efx_mtd->part[0].mtd.flags = MTD_CAP_NORFLASH;
	386	efx_mtd->part[0].mtd.size = spi->size - FALCON_FLASH_BOOTCODE_START;
	387	efx_mtd->part[0].mtd.erasesize = spi->erase_size;
	388	efx_mtd->part[0].offset = FALCON_FLASH_BOOTCODE_START;
	389	efx_mtd->part[0].type_name = "sfc_flash_bootrom";
	390
	391	rc = efx_mtd_probe_device(efx, efx_mtd);
	392	if (rc)
f4150724	393	kfree(efx_mtd);
76884835	394	return rc;
f4150724	395	}