driver/intel/ish: add ish chip driver support

We want to be able to specify the firmware variant suffix
in the devicetree.cb configuration for particular firmware
builds. This driver allows us to specify the firmware_variant
property in the device tree and have it populate a _DST table
in the SSDT ACPI table for the ISH device, thus making the
suffix available to the kernel (See crrev.com/c/1433482 for kernel
change that uses the value)

BUG=b:122722008
TEST=decompile DDST table and verify that new firmware-variant value
is present. Also verfied that kernel can access this new field using
the shim loader kernel CLs

Change-Id: Id8be986185282521aee574027503eaf8968e1508
Signed-off-by: Jett Rink <jettrink@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31682
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/drivers/intel/ish/chip.h b/src/drivers/intel/ish/chip.h
new file mode 100644
index 0000000000..ae3fb35b8d
--- /dev/null
+++ b/src/drivers/intel/ish/chip.h
@@ -0,0 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google LLC
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+/*
+ * Intel Integrated Sensor Hub (ISH)
+ */
+struct drivers_intel_ish_config {
+	/* Firmware name used by kernel for loading ISH firmware */
+	const char *firmware_name;
+};