Add support for the ENE Embedded Debug Interface EDI and KB9012 EC

The ENE Embedded Debug Interface (EDI) is a SPI-based interface for
accessing the memory of ENE embedded controllers.

The ENE KB9012 EC is an embedded controller found on various laptops
such as the Lenovo G505s. It features a 8051 microcontroller and
has 128 KiB of internal storage for program data.

EDI can be accessed on the KB9012 through pins 59-62 (CS-CLK-MOSI-MISO)
when flash direct access is not in use. Some firmwares disable EDI at runtime
so it might be necessary to ground pin 42 to reset the 8051 microcontroller
before accessing the KB9012 via EDI.

The example of flashing KB9012 at Lenovo G505S laptop could be found here:
http://dangerousprototypes.com/docs/Flashing_KB9012_with_Bus_Pirate

Change-Id: Ib8b2eb2feeef5c337d725d15ebf994a299897854
Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/23259
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

1 files changed, 51 insertions, 0 deletions

diff --git a/ene.h b/ene.h
new file mode 100644
index 000000000..e03e49b2e
--- /dev/null
+++ b/ene.h
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2015 Paul Kocialkowski <contact@paulk.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __ENE_H__
+#define __ENE_H__ 1
+
+#define ENE_XBI_EFA0			0xfea8
+#define ENE_XBI_EFA1			0xfea9
+#define ENE_XBI_EFA2			0xfeaa
+#define ENE_XBI_EFDAT			0xfeab
+#define ENE_XBI_EFCMD			0xfeac
+#define ENE_XBI_EFCFG			0xfead
+
+#define ENE_XBI_EFCFG_CMD_WE		(1 << 3)
+#define ENE_XBI_EFCFG_BUSY		(1 << 1)
+
+#define ENE_XBI_EFCMD_HVPL_LATCH	0x02
+#define ENE_XBI_EFCMD_READ		0x03
+#define ENE_XBI_EFCMD_ERASE		0x20
+#define ENE_XBI_EFCMD_PROGRAM		0x70
+#define ENE_XBI_EFCMD_HVPL_CLEAR	0x80
+
+#define ENE_EC_PXCFG			0xff14
+
+#define ENE_EC_PXCFG_8051_RESET		0x01
+
+#define ENE_EC_HWVERSION		0xff00
+#define ENE_EC_EDIID			0xff24
+
+#define ENE_KB9012_HWVERSION		0xc3
+#define ENE_KB9012_EDIID		0x04
+
+struct ene_chip {
+	unsigned char hwversion;
+	unsigned char ediid;
+};
+
+#endif