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Diffstat (limited to 'drivers/net/sfc/mtd.c')
-rw-r--r--drivers/net/sfc/mtd.c268
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 000000000000..665cafb88d6a
--- /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_wait_write(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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 21:47:54 +0100