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author | Ben Hutchings <bhutchings@solarflare.com> | 2008-11-04 20:34:28 +0000 |
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committer | Jeff Garzik <jgarzik@redhat.com> | 2008-11-06 00:49:57 -0500 |
commit | f41507245ef8b079685aba8da5b5b2b5e87e70bc (patch) | |
tree | be8c8aee6a6fc3c69d946dcd3fe24306bf89775e /drivers/net/sfc/mtd.c | |
parent | 0a95f56323ce93dac354c1b2d54bf959a985cf7d (diff) | |
download | kernel_samsung_smdk4412-f41507245ef8b079685aba8da5b5b2b5e87e70bc.zip kernel_samsung_smdk4412-f41507245ef8b079685aba8da5b5b2b5e87e70bc.tar.gz kernel_samsung_smdk4412-f41507245ef8b079685aba8da5b5b2b5e87e70bc.tar.bz2 |
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>
Diffstat (limited to 'drivers/net/sfc/mtd.c')
-rw-r--r-- | drivers/net/sfc/mtd.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/drivers/net/sfc/mtd.c b/drivers/net/sfc/mtd.c new file mode 100644 index 0000000..a1e6c28 --- /dev/null +++ b/drivers/net/sfc/mtd.c @@ -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; +} |