scsi: soc: mediatek: add header for SiP service interface

Add a common header for the SiP service interface in MediaTek Chipsets.

Cc: Alim Akhtar <alim.akhtar@samsung.com>
Cc: Avri Altman <avri.altman@wdc.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Bean Huo <beanhuo@micron.com>
Cc: Can Guo <cang@codeaurora.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/1577683950-1702-2-git-send-email-stanley.chu@mediatek.com
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

include/linux/soc/mediatek/mtk_sip_svc.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 MediaTek Inc.
+ */
+#ifndef __MTK_SIP_SVC_H
+#define __MTK_SIP_SVC_H
+
+/* Error Code */
+#define SIP_SVC_E_SUCCESS               0
+#define SIP_SVC_E_NOT_SUPPORTED         -1
+#define SIP_SVC_E_INVALID_PARAMS        -2
+#define SIP_SVC_E_INVALID_RANGE         -3
+#define SIP_SVC_E_PERMISSION_DENIED     -4
+
+#ifdef CONFIG_ARM64
+#define MTK_SIP_SMC_CONVENTION          ARM_SMCCC_SMC_64
+#else
+#define MTK_SIP_SMC_CONVENTION          ARM_SMCCC_SMC_32
+#endif
+
+#define MTK_SIP_SMC_CMD(fn_id) \
+	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, MTK_SIP_SMC_CONVENTION, \
+			   ARM_SMCCC_OWNER_SIP, fn_id)
+
+#endif