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

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

Cc: Alim Akhtar <[e-mail]>
Cc: Avri Altman <[e-mail]>
Cc: Bart Van Assche <[e-mail]>
Cc: Bean Huo <[e-mail]>
Cc: Can Guo <[e-mail]>
Cc: Florian Fainelli <[e-mail]>
Cc: Matthias Brugger <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stanley Chu <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

include/linux/soc/mediatek/mtk_sip_svc.h

···
+/* 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