misc: Add Lattice ECP3 FPGA configuration via SPI

This patch adds support for bitstream configuration (programming /
loading) of the Lattice ECP3 FPGA's via the SPI bus.

Here an example on my custom MPC5200 based board:

$ echo 1 > /sys/class/firmware/spi0.0/loading
$ cat fpga_a4m2k.bit > /sys/class/firmware/spi0.0/data
$ echo 0 > /sys/class/firmware/spi0.0/loading

leads to these messages:

lattice-ecp3 spi0.0: FPGA Lattice ECP3-35 detected
lattice-ecp3 spi0.0: Configuring the FPGA...
lattice-ecp3 spi0.0: FPGA succesfully configured!

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Ming Lei <ming.lei@canonical.com>
Reviewed-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 264e647413b5..3ec3f9ece9d9 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -499,6 +499,17 @@ config USB_SWITCH_FSA9480
           stereo and mono audio, video, microphone and UART data to use
           a common connector port.
 
+config LATTICE_ECP3_CONFIG
+        tristate "Lattice ECP3 FPGA bitstream configuration via SPI"
+        depends on SPI && SYSFS
+        select FW_LOADER
+        default n
+        help
+          This option enables support for bitstream configuration (programming
+          or loading) of the Lattice ECP3 FPGA family via SPI.
+
+          If unsure, say N.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"