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
committed by
Jeff Garzik
Jeff Garzik
parent
0a95f56323
commit
f41507245e
268
drivers/net/sfc/mtd.c
Normal file
268
drivers/net/sfc/mtd.c
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@@ -0,0 +1,268 @@
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/****************************************************************************
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* Driver for Solarflare Solarstorm network controllers and boards
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* Copyright 2005-2006 Fen Systems Ltd.
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* Copyright 2006-2008 Solarflare Communications Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation, incorporated herein by reference.
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*/
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#include <linux/module.h>
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#include <linux/mtd/mtd.h>
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#include <linux/delay.h>
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#define EFX_DRIVER_NAME "sfc_mtd"
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#include "net_driver.h"
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#include "spi.h"
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#define EFX_SPI_VERIFY_BUF_LEN 16
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struct efx_mtd {
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const struct efx_spi_device *spi;
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struct mtd_info mtd;
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char name[IFNAMSIZ + 20];
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};
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/* SPI utilities */
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static int efx_spi_slow_wait(struct efx_mtd *efx_mtd, bool uninterruptible)
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{
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const struct efx_spi_device *spi = efx_mtd->spi;
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struct efx_nic *efx = spi->efx;
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u8 status;
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int rc, i;
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/* Wait up to 4s for flash/EEPROM to finish a slow operation. */
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for (i = 0; i < 40; i++) {
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__set_current_state(uninterruptible ?
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TASK_UNINTERRUPTIBLE : TASK_INTERRUPTIBLE);
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schedule_timeout(HZ / 10);
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rc = falcon_spi_cmd(spi, SPI_RDSR, -1, NULL,
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&status, sizeof(status));
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if (rc)
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return rc;
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if (!(status & SPI_STATUS_NRDY))
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return 0;
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if (signal_pending(current))
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return -EINTR;
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}
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EFX_ERR(efx, "timed out waiting for %s\n", efx_mtd->name);
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return -ETIMEDOUT;
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}
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static int efx_spi_unlock(const struct efx_spi_device *spi)
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{
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const u8 unlock_mask = (SPI_STATUS_BP2 | SPI_STATUS_BP1 |
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SPI_STATUS_BP0);
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u8 status;
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int rc;
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rc = falcon_spi_cmd(spi, SPI_RDSR, -1, NULL, &status, sizeof(status));
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if (rc)
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return rc;
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if (!(status & unlock_mask))
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return 0; /* already unlocked */
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rc = falcon_spi_cmd(spi, SPI_WREN, -1, NULL, NULL, 0);
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if (rc)
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return rc;
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rc = falcon_spi_cmd(spi, SPI_SST_EWSR, -1, NULL, NULL, 0);
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if (rc)
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return rc;
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status &= ~unlock_mask;
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rc = falcon_spi_cmd(spi, SPI_WRSR, -1, &status, NULL, sizeof(status));
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if (rc)
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return rc;
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rc = falcon_spi_fast_wait(spi);
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if (rc)
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return rc;
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return 0;
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}
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static int efx_spi_erase(struct efx_mtd *efx_mtd, loff_t start, size_t len)
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{
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const struct efx_spi_device *spi = efx_mtd->spi;
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unsigned pos, block_len;
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u8 empty[EFX_SPI_VERIFY_BUF_LEN];
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u8 buffer[EFX_SPI_VERIFY_BUF_LEN];
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int rc;
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if (len != spi->erase_size)
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return -EINVAL;
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if (spi->erase_command == 0)
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return -EOPNOTSUPP;
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rc = efx_spi_unlock(spi);
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if (rc)
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return rc;
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rc = falcon_spi_cmd(spi, SPI_WREN, -1, NULL, NULL, 0);
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if (rc)
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return rc;
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rc = falcon_spi_cmd(spi, spi->erase_command, start, NULL, NULL, 0);
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if (rc)
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return rc;
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rc = efx_spi_slow_wait(efx_mtd, false);
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/* Verify the entire region has been wiped */
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memset(empty, 0xff, sizeof(empty));
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for (pos = 0; pos < len; pos += block_len) {
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block_len = min(len - pos, sizeof(buffer));
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rc = falcon_spi_read(spi, start + pos, block_len, NULL, buffer);
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if (rc)
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return rc;
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if (memcmp(empty, buffer, block_len))
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return -EIO;
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/* Avoid locking up the system */
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cond_resched();
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if (signal_pending(current))
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return -EINTR;
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}
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return rc;
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}
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/* MTD interface */
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static int efx_mtd_read(struct mtd_info *mtd, loff_t start, size_t len,
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size_t *retlen, u8 *buffer)
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{
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struct efx_mtd *efx_mtd = mtd->priv;
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const struct efx_spi_device *spi = efx_mtd->spi;
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struct efx_nic *efx = spi->efx;
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int rc;
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rc = mutex_lock_interruptible(&efx->spi_lock);
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if (rc)
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return rc;
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rc = falcon_spi_read(spi, FALCON_FLASH_BOOTCODE_START + start,
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len, retlen, buffer);
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mutex_unlock(&efx->spi_lock);
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return rc;
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}
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static int efx_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
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{
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struct efx_mtd *efx_mtd = mtd->priv;
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struct efx_nic *efx = efx_mtd->spi->efx;
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int rc;
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rc = mutex_lock_interruptible(&efx->spi_lock);
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if (rc)
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return rc;
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rc = efx_spi_erase(efx_mtd, FALCON_FLASH_BOOTCODE_START + erase->addr,
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erase->len);
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mutex_unlock(&efx->spi_lock);
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if (rc == 0) {
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erase->state = MTD_ERASE_DONE;
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} else {
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erase->state = MTD_ERASE_FAILED;
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erase->fail_addr = 0xffffffff;
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}
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mtd_erase_callback(erase);
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return rc;
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}
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static int efx_mtd_write(struct mtd_info *mtd, loff_t start,
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size_t len, size_t *retlen, const u8 *buffer)
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{
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struct efx_mtd *efx_mtd = mtd->priv;
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const struct efx_spi_device *spi = efx_mtd->spi;
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struct efx_nic *efx = spi->efx;
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int rc;
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rc = mutex_lock_interruptible(&efx->spi_lock);
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if (rc)
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return rc;
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rc = falcon_spi_write(spi, FALCON_FLASH_BOOTCODE_START + start,
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len, retlen, buffer);
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mutex_unlock(&efx->spi_lock);
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return rc;
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}
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static void efx_mtd_sync(struct mtd_info *mtd)
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{
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struct efx_mtd *efx_mtd = mtd->priv;
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struct efx_nic *efx = efx_mtd->spi->efx;
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int rc;
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mutex_lock(&efx->spi_lock);
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rc = efx_spi_slow_wait(efx_mtd, true);
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mutex_unlock(&efx->spi_lock);
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if (rc)
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EFX_ERR(efx, "%s sync failed (%d)\n", efx_mtd->name, rc);
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return;
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}
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void efx_mtd_remove(struct efx_nic *efx)
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{
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if (efx->spi_flash && efx->spi_flash->mtd) {
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struct efx_mtd *efx_mtd = efx->spi_flash->mtd;
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int rc;
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for (;;) {
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rc = del_mtd_device(&efx_mtd->mtd);
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if (rc != -EBUSY)
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break;
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ssleep(1);
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}
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WARN_ON(rc);
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kfree(efx_mtd);
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}
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}
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void efx_mtd_rename(struct efx_nic *efx)
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{
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if (efx->spi_flash && efx->spi_flash->mtd) {
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struct efx_mtd *efx_mtd = efx->spi_flash->mtd;
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snprintf(efx_mtd->name, sizeof(efx_mtd->name),
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"%s sfc_flash_bootrom", efx->name);
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}
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}
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int efx_mtd_probe(struct efx_nic *efx)
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{
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struct efx_spi_device *spi = efx->spi_flash;
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struct efx_mtd *efx_mtd;
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if (!spi || spi->size <= FALCON_FLASH_BOOTCODE_START)
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return -ENODEV;
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efx_mtd = kzalloc(sizeof(*efx_mtd), GFP_KERNEL);
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if (!efx_mtd)
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return -ENOMEM;
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efx_mtd->spi = spi;
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spi->mtd = efx_mtd;
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efx_mtd->mtd.type = MTD_NORFLASH;
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efx_mtd->mtd.flags = MTD_CAP_NORFLASH;
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efx_mtd->mtd.size = spi->size - FALCON_FLASH_BOOTCODE_START;
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efx_mtd->mtd.erasesize = spi->erase_size;
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efx_mtd->mtd.writesize = 1;
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efx_mtd_rename(efx);
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efx_mtd->mtd.owner = THIS_MODULE;
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efx_mtd->mtd.priv = efx_mtd;
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efx_mtd->mtd.name = efx_mtd->name;
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efx_mtd->mtd.erase = efx_mtd_erase;
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efx_mtd->mtd.read = efx_mtd_read;
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efx_mtd->mtd.write = efx_mtd_write;
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efx_mtd->mtd.sync = efx_mtd_sync;
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if (add_mtd_device(&efx_mtd->mtd)) {
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kfree(efx_mtd);
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spi->mtd = NULL;
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/* add_mtd_device() returns 1 if the MTD table is full */
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return -ENOMEM;
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}
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return 0;
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}
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