[PATCH v2 2/5] firmware: stratix10-svc: Add SMC call for SDM address remapper configuration

[Adrian Ng Ho Yin]

Add INTEL_SIP_SMC_SDM_REMAPPER_CONFIG, a new synchronous SMC that
configures the SDM hardware address remapper introduced in Agilex5 REV B.
The remapper must be bypassed when the SMMU is active to avoid conflicts
with IOMMU address translation and keep behaviour consistent across all
Agilex5 revisions.

Signed-off-by: Adrian Ng Ho Yin <adrian.ho.yin.ng@xxxxxxxxxx>
---
 include/linux/firmware/intel/stratix10-smc.h | 23 ++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/linux/firmware/intel/stratix10-smc.h b/include/linux/firmware/intel/stratix10-smc.h
index 9116512169dc..daa693699c97 100644
--- a/include/linux/firmware/intel/stratix10-smc.h
+++ b/include/linux/firmware/intel/stratix10-smc.h
@@ -746,4 +746,27 @@ INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_FPGA_CONFIG_COMPLETED_WRITE)
 #define INTEL_SIP_SMC_ASYNC_FUNC_ID_RSU_NOTIFY (0xEC)
 #define INTEL_SIP_SMC_ASYNC_RSU_NOTIFY \
 	INTEL_SIP_SMC_ASYNC_VAL(INTEL_SIP_SMC_ASYNC_FUNC_ID_RSU_NOTIFY)
+
+/**
+ * Request INTEL_SIP_SMC_SDM_REMAPPER_CONFIG
+ *
+ * Sync call to configure the SDM address remapper. On Agilex5, the remapper
+ * must be bypassed when the SMMU is active to avoid conflicts with IOMMU
+ * address translation.
+ *
+ * Call register usage:
+ * a0: INTEL_SIP_SMC_SDM_REMAPPER_CONFIG
+ * a1: INTEL_SIP_SMC_SDM_REMAPPER_ENABLE or INTEL_SIP_SMC_SDM_REMAPPER_BYPASS
+ * a2-7: not used
+ *
+ * Return status:
+ * a0: INTEL_SIP_SMC_STATUS_OK
+ * a1-3: not used
+ */
+#define INTEL_SIP_SMC_FUNCID_SDM_REMAPPER_CONFIG	513
+#define INTEL_SIP_SMC_SDM_REMAPPER_CONFIG \
+	INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_SDM_REMAPPER_CONFIG)
+#define INTEL_SIP_SMC_SDM_REMAPPER_ENABLE		0
+#define INTEL_SIP_SMC_SDM_REMAPPER_BYPASS		1
+
 #endif
-- 
2.49.GIT