digilent_spi: add a driver for the iCEblink40 development board

This is driver that supports the Lattice iCE40 evaluation kits. On the
board is a SPI flash memory chip labeled ST 25P10VP.

Tested to work read/write/erase with "-p digilent_spi -c M25P10" or
with a patch that resets the part beforehands (in which case it gets
detected as a M25P10-A and is way faster due to paged writes).

Change-Id: I7ffcd9a2db4395816f0e8b6ce6c3b0d8e930c9e6
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-on: https://review.coreboot.org/23338
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/flashrom.c b/flashrom.c
index f85dbb1..1866a18 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -413,6 +413,18 @@
 	},
 #endif
 
+#if CONFIG_DIGILENT_SPI == 1
+	{
+		.name			= "digilent_spi",
+		.type			= USB,
+		.devs.dev		= devs_digilent_spi,
+		.init			= digilent_spi_init,
+		.map_flash_region	= fallback_map,
+		.unmap_flash_region	= fallback_unmap,
+		.delay			= internal_delay,
+	},
+#endif
+
 	{0}, /* This entry corresponds to PROGRAMMER_INVALID. */
 };