sc7280: Add Modem region to avoid modem cleanup in Secboot reboot

Modem uses different memory regions based on LTE/WiFi.
This adds correct carve-out to prevent region being disturbed.

BUG=b:182963902
TEST=Validated on qualcomm sc7280 developement board

Signed-off-by: T Michael Turney <quic_mturney@quicinc.com>
Change-Id: I56bfb210606b08893ff71dd1b6679f1ec102ec95
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58545
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Shelley Chen <shchen@google.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/soc/qualcomm/sc7280/carve_out.c b/src/soc/qualcomm/sc7280/carve_out.c
new file mode 100644
index 0000000000..d548235922
--- /dev/null
+++ b/src/soc/qualcomm/sc7280/carve_out.c
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/stages.h>
+#include <soc/mmu_common.h>
+#include <soc/symbols_common.h>
+#include <device/mmio.h>
+
+#define MODEM_ONLY 0x004c5445
+
+bool soc_modem_carve_out(void **start, void **end)
+{
+	uint32_t modem_id = read32(_modem_id);
+
+	switch (modem_id) {
+	case MODEM_ONLY:
+		*start = _dram_modem;
+		*end = _edram_modem;
+		return true;
+	default:
+		return false;
+	}
+}