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>

1 files changed, 15 insertions, 2 deletions

diff --git a/drivers/net/sfc/spi.h b/drivers/net/sfc/spi.h
index b73f86cf5fa2..c4aca132348a 100644
--- a/drivers/net/sfc/spi.h
+++ b/drivers/net/sfc/spi.h
@@ -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