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sfc: Expose flash region storing boot code as MTD 

The boot code that appears as a PCI expansion ROM on the SFC4000 is
stored in flash.  Expose this as a standard MTD device to allow for
in-place upgrades.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Ben Hutchings 2008-11-04 20:34:28 +00:00 committed by Jeff Garzik
parent 0a95f56323
commit f41507245e
9 changed files with 327 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/sfc/Kconfig
View File

@ -12,3 +12,11 @@ config SFC
To compile this driver as a module, choose M here. The module
will be called sfc.
config SFC_MTD
bool "Solarflare Solarstorm SFC4000 flash MTD support"
depends on SFC && MTD
default y
help
This exposes the on-board flash memory as an MTD device (e.g.
/dev/mtd1). This makes it possible to upload new boot code
to the NIC.

1
drivers/net/sfc/Makefile
View File

@ -1,5 +1,6 @@
sfc-y += efx.o falcon.o tx.o rx.o falcon_xmac.o \
selftest.o ethtool.o xfp_phy.o \
mdio_10g.o tenxpress.o boards.o sfe4001.o
sfc-$(CONFIG_SFC_MTD) += mtd.o
obj-$(CONFIG_SFC) += sfc.o

7
drivers/net/sfc/efx.c
View File

@ -1459,6 +1459,7 @@ static int efx_netdev_event(struct notifier_block *this,
struct efx_nic *efx = netdev_priv(net_dev);
strcpy(efx->name, net_dev->name);
efx_mtd_rename(efx);
}
return NOTIFY_DONE;
@ -1550,6 +1551,7 @@ void efx_reset_down(struct efx_nic *efx, struct ethtool_cmd *ecmd)
efx_stop_all(efx);
mutex_lock(&efx->mac_lock);
mutex_lock(&efx->spi_lock);
rc = falcon_xmac_get_settings(efx, ecmd);
if (rc)
@ -1582,6 +1584,7 @@ int efx_reset_up(struct efx_nic *efx, struct ethtool_cmd *ecmd, bool ok)
EFX_ERR(efx, "could not restore PHY settings\n");
}
mutex_unlock(&efx->spi_lock);
mutex_unlock(&efx->mac_lock);
if (ok) {
@ -1777,6 +1780,7 @@ static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type,
memset(efx, 0, sizeof(*efx));
spin_lock_init(&efx->biu_lock);
spin_lock_init(&efx->phy_lock);
mutex_init(&efx->spi_lock);
INIT_WORK(&efx->reset_work, efx_reset_work);
INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor);
efx->pci_dev = pci_dev;
@ -1911,6 +1915,8 @@ static void efx_pci_remove(struct pci_dev *pci_dev)
if (!efx)
return;
efx_mtd_remove(efx);
/* Mark the NIC as fini, then stop the interface */
rtnl_lock();
efx->state = STATE_FINI;
@ -2077,6 +2083,7 @@ static int __devinit efx_pci_probe(struct pci_dev *pci_dev,
EFX_LOG(efx, "initialisation successful\n");
efx_mtd_probe(efx); /* allowed to fail */
return 0;
fail5:

10
drivers/net/sfc/efx.h
View File

@ -58,6 +58,16 @@ extern int efx_port_dummy_op_int(struct efx_nic *efx);
extern void efx_port_dummy_op_void(struct efx_nic *efx);
extern void efx_port_dummy_op_blink(struct efx_nic *efx, bool blink);
/* MTD */
#ifdef CONFIG_SFC_MTD
extern int efx_mtd_probe(struct efx_nic *efx);
extern void efx_mtd_rename(struct efx_nic *efx);
extern void efx_mtd_remove(struct efx_nic *efx);
#else
static inline int efx_mtd_probe(struct efx_nic *efx) { return 0; }
static inline void efx_mtd_rename(struct efx_nic *efx) {}
static inline void efx_mtd_remove(struct efx_nic *efx) {}
#endif
extern unsigned int efx_monitor_interval;

4
drivers/net/sfc/ethtool.c
View File

@ -554,8 +554,10 @@ static int efx_ethtool_get_eeprom(struct net_device *net_dev,
size_t len;
int rc;
mutex_lock(&efx->spi_lock);
rc = falcon_spi_read(spi, eeprom->offset + EFX_EEPROM_BOOTCONFIG_START,
eeprom->len, &len, buf);
mutex_unlock(&efx->spi_lock);
eeprom->magic = EFX_ETHTOOL_EEPROM_MAGIC;
eeprom->len = len;
return rc;
@ -572,8 +574,10 @@ static int efx_ethtool_set_eeprom(struct net_device *net_dev,
if (eeprom->magic != EFX_ETHTOOL_EEPROM_MAGIC)
return -EINVAL;
mutex_lock(&efx->spi_lock);
rc = falcon_spi_write(spi, eeprom->offset + EFX_EEPROM_BOOTCONFIG_START,
eeprom->len, &len, buf);
mutex_unlock(&efx->spi_lock);
eeprom->len = len;
return rc;
}

17
drivers/net/sfc/falcon.c
View File

@ -1628,9 +1628,9 @@ static int falcon_spi_wait(struct efx_nic *efx)
}
}
static int falcon_spi_cmd(const struct efx_spi_device *spi,
unsigned int command, int address,
const void *in, void *out, unsigned int len)
int falcon_spi_cmd(const struct efx_spi_device *spi,
unsigned int command, int address,
const void *in, void *out, unsigned int len)
{
struct efx_nic *efx = spi->efx;
bool addressed = (address >= 0);
@ -1641,6 +1641,7 @@ static int falcon_spi_cmd(const struct efx_spi_device *spi,
/* Input validation */
if (len > FALCON_SPI_MAX_LEN)
return -EINVAL;
BUG_ON(!mutex_is_locked(&efx->spi_lock));
/* Check SPI not currently being accessed */
rc = falcon_spi_wait(efx);
@ -1699,8 +1700,7 @@ efx_spi_munge_command(const struct efx_spi_device *spi,
return command | (((address >> 8) & spi->munge_address) << 3);
}
static int falcon_spi_fast_wait(const struct efx_spi_device *spi)
int falcon_spi_fast_wait(const struct efx_spi_device *spi)
{
u8 status;
int i, rc;
@ -2259,7 +2259,9 @@ int falcon_read_nvram(struct efx_nic *efx, struct falcon_nvconfig *nvconfig_out)
nvconfig = region + NVCONFIG_OFFSET;
spi = efx->spi_flash ? efx->spi_flash : efx->spi_eeprom;
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");
@ -2555,6 +2557,11 @@ static int falcon_spi_device_init(struct efx_nic *efx,
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);

268
drivers/net/sfc/mtd.c Normal file
View File

@ -0,0 +1,268 @@
/****************************************************************************
* 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>
#define EFX_DRIVER_NAME "sfc_mtd"
#include "net_driver.h"
#include "spi.h"
#define EFX_SPI_VERIFY_BUF_LEN 16
struct efx_mtd {
const struct efx_spi_device *spi;
struct mtd_info mtd;
char name[IFNAMSIZ + 20];
};
/* 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 = spi->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(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(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(spi, SPI_RDSR, -1, NULL, &status, sizeof(status));
if (rc)
return rc;
if (!(status & unlock_mask))
return 0; /* already unlocked */
rc = falcon_spi_cmd(spi, SPI_WREN, -1, NULL, NULL, 0);
if (rc)
return rc;
rc = falcon_spi_cmd(spi, SPI_SST_EWSR, -1, NULL, NULL, 0);
if (rc)
return rc;
status &= ~unlock_mask;
rc = falcon_spi_cmd(spi, SPI_WRSR, -1, &status, NULL, sizeof(status));
if (rc)
return rc;
rc = falcon_spi_fast_wait(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;
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(spi);
if (rc)
return rc;
rc = falcon_spi_cmd(spi, SPI_WREN, -1, NULL, NULL, 0);
if (rc)
return rc;
rc = falcon_spi_cmd(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(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_read(struct mtd_info *mtd, loff_t start, size_t len,
size_t *retlen, u8 *buffer)
{
struct efx_mtd *efx_mtd = mtd->priv;
const struct efx_spi_device *spi = efx_mtd->spi;
struct efx_nic *efx = spi->efx;
int rc;
rc = mutex_lock_interruptible(&efx->spi_lock);
if (rc)
return rc;
rc = falcon_spi_read(spi, FALCON_FLASH_BOOTCODE_START + start,
len, retlen, buffer);
mutex_unlock(&efx->spi_lock);
return rc;
}
static int efx_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
{
struct efx_mtd *efx_mtd = mtd->priv;
struct efx_nic *efx = efx_mtd->spi->efx;
int rc;
rc = mutex_lock_interruptible(&efx->spi_lock);
if (rc)
return rc;
rc = efx_spi_erase(efx_mtd, FALCON_FLASH_BOOTCODE_START + erase->addr,
erase->len);
mutex_unlock(&efx->spi_lock);
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 int efx_mtd_write(struct mtd_info *mtd, loff_t start,
size_t len, size_t *retlen, const u8 *buffer)
{
struct efx_mtd *efx_mtd = mtd->priv;
const struct efx_spi_device *spi = efx_mtd->spi;
struct efx_nic *efx = spi->efx;
int rc;
rc = mutex_lock_interruptible(&efx->spi_lock);
if (rc)
return rc;
rc = falcon_spi_write(spi, FALCON_FLASH_BOOTCODE_START + start,
len, retlen, buffer);
mutex_unlock(&efx->spi_lock);
return rc;
}
static void efx_mtd_sync(struct mtd_info *mtd)
{
struct efx_mtd *efx_mtd = mtd->priv;
struct efx_nic *efx = efx_mtd->spi->efx;
int rc;
mutex_lock(&efx->spi_lock);
rc = efx_spi_slow_wait(efx_mtd, true);
mutex_unlock(&efx->spi_lock);
if (rc)
EFX_ERR(efx, "%s sync failed (%d)\n", efx_mtd->name, rc);
return;
}
void efx_mtd_remove(struct efx_nic *efx)
{
if (efx->spi_flash && efx->spi_flash->mtd) {
struct efx_mtd *efx_mtd = efx->spi_flash->mtd;
int rc;
for (;;) {
rc = del_mtd_device(&efx_mtd->mtd);
if (rc != -EBUSY)
break;
ssleep(1);
}
WARN_ON(rc);
kfree(efx_mtd);
}
}
void efx_mtd_rename(struct efx_nic *efx)
{
if (efx->spi_flash && efx->spi_flash->mtd) {
struct efx_mtd *efx_mtd = efx->spi_flash->mtd;
snprintf(efx_mtd->name, sizeof(efx_mtd->name),
"%s sfc_flash_bootrom", efx->name);
}
}
int efx_mtd_probe(struct efx_nic *efx)
{
struct efx_spi_device *spi = efx->spi_flash;
struct efx_mtd *efx_mtd;
if (!spi || spi->size <= FALCON_FLASH_BOOTCODE_START)
return -ENODEV;
efx_mtd = kzalloc(sizeof(*efx_mtd), GFP_KERNEL);
if (!efx_mtd)
return -ENOMEM;
efx_mtd->spi = spi;
spi->mtd = efx_mtd;
efx_mtd->mtd.type = MTD_NORFLASH;
efx_mtd->mtd.flags = MTD_CAP_NORFLASH;
efx_mtd->mtd.size = spi->size - FALCON_FLASH_BOOTCODE_START;
efx_mtd->mtd.erasesize = spi->erase_size;
efx_mtd->mtd.writesize = 1;
efx_mtd_rename(efx);
efx_mtd->mtd.owner = THIS_MODULE;
efx_mtd->mtd.priv = efx_mtd;
efx_mtd->mtd.name = efx_mtd->name;
efx_mtd->mtd.erase = efx_mtd_erase;
efx_mtd->mtd.read = efx_mtd_read;
efx_mtd->mtd.write = efx_mtd_write;
efx_mtd->mtd.sync = efx_mtd_sync;
if (add_mtd_device(&efx_mtd->mtd)) {
kfree(efx_mtd);
spi->mtd = NULL;
/* add_mtd_device() returns 1 if the MTD table is full */
return -ENOMEM;
}
return 0;
}

2
drivers/net/sfc/net_driver.h
View File

@ -655,6 +655,7 @@ union efx_multicast_hash {
* This field will be %NULL if no flash device is present.
* @spi_eeprom: SPI EEPROM device
* This field will be %NULL if no EEPROM device is present.
* @spi_lock: SPI bus lock
* @n_rx_nodesc_drop_cnt: RX no descriptor drop count
* @nic_data: Hardware dependant state
* @mac_lock: MAC access lock. Protects @port_enabled, @phy_mode,
@ -731,6 +732,7 @@ struct efx_nic {
struct efx_spi_device *spi_flash;
struct efx_spi_device *spi_eeprom;
struct mutex spi_lock;
unsigned n_rx_nodesc_drop_cnt;

17
drivers/net/sfc/spi.h
View File

@ -25,6 +25,7 @@
#define SPI_WRDI 0x04 /* Reset write enable latch */
#define SPI_RDSR 0x05 /* Read status register */
#define SPI_WREN 0x06 /* Set write enable latch */
#define SPI_SST_EWSR 0x50 /* SST: Enable write to status register */
#define SPI_STATUS_WPEN 0x80 /* Write-protect pin enabled */
#define SPI_STATUS_BP2 0x10 /* Block protection bit 2 */
@ -36,6 +37,7 @@
/**
* struct efx_spi_device - an Efx SPI (Serial Peripheral Interface) device
* @efx: The Efx controller that owns this device
* @mtd: MTD state
* @device_id: Controller's id for the device
* @size: Size (in bytes)
* @addr_len: Number of address bytes in read/write commands
@ -44,20 +46,30 @@
* use bit 3 of the command byte as address bit A8, rather
* than having a two-byte address. If this flag is set, then
* commands should be munged in this way.
* @erase_command: Erase command (or 0 if sector erase not needed).
* @erase_size: Erase sector size (in bytes)
* Erase commands affect sectors with this size and alignment.
* This must be a power of two.
* @block_size: Write block size (in bytes).
* Write commands are limited to blocks with this size and alignment.
* @read: Read function for the device
* @write: Write function for the device
*/
struct efx_spi_device {
struct efx_nic *efx;
#ifdef CONFIG_SFC_MTD
void *mtd;
#endif
int device_id;
unsigned int size;
unsigned int addr_len;
unsigned int munge_address:1;
u8 erase_command;
unsigned int erase_size;
unsigned int block_size;
};
int falcon_spi_cmd(const struct efx_spi_device *spi, unsigned int command,
int address, const void* in, void *out, unsigned int len);
int falcon_spi_fast_wait(const struct efx_spi_device *spi);
int falcon_spi_read(const struct efx_spi_device *spi, loff_t start,
size_t len, size_t *retlen, u8 *buffer);
int falcon_spi_write(const struct efx_spi_device *spi, loff_t start,
@ -77,6 +89,7 @@ int falcon_spi_write(const struct efx_spi_device *spi, loff_t start,
* be absent or truncated depending on the devices used.
*/
#define FALCON_NVCONFIG_END 0x400U
#define FALCON_FLASH_BOOTCODE_START 0x8000U
#define EFX_EEPROM_BOOTCONFIG_START 0x800U
#define EFX_EEPROM_BOOTCONFIG_END 0x1800U