mb/google/myst: Add new mainboard

Myst is a new Google mainboard with an AMD Phoenix SOC.

BUG=b:270596106
TEST=util/abuild/abuild -t GOOGLE_MYST --clean

Signed-off-by: Jon Murphy <jpmurphy@google.com>
Change-Id: Id7d731ce4d6cb6d4e9041f46eb5a799865bb0b9a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74093
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/mainboard/google/myst/mainboard.c b/src/mainboard/google/myst/mainboard.c
new file mode 100644
index 0000000000..09118d4186
--- /dev/null
+++ b/src/mainboard/google/myst/mainboard.c
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <amdblocks/amd_pci_util.h>
+#include <baseboard/variants.h>
+#include <device/device.h>
+
+static const struct fch_irq_routing fch_irq_map[] = {
+	{ 0,	0x00,		0x00 },
+};
+
+const struct fch_irq_routing *mb_get_fch_irq_mapping(size_t *length)
+{
+	*length = ARRAY_SIZE(fch_irq_map);
+	return fch_irq_map;
+}
+
+static void mainboard_init(void *chip_info)
+{
+	/* TODO(b/270596581): Perform mainboard initialization */
+}
+
+static void mainboard_enable(struct device *dev)
+{
+	/* TODO(b/270618107): Enable mainboard */
+}
+
+struct chip_operations mainboard_ops = {
+	.init = mainboard_init,
+	.enable_dev = mainboard_enable,
+};