imx: add i.MX8 SoCs OTP SIP(silicon provider) service support

For NXP's i.MX8 SoCs with system controller inside, OTP is
maintained by SCFW, Linux needs to call SMC to trap to TF-A
for OTP read/write etc. operations by calling SCFW API.

This patch adds OTP SIP service support.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>

plat/imx/common/imx_sip_handler.c

@@ -102,3 +102,29 @@ int imx_wakeup_src_handler(uint32_t smc_fid,
 
 	return SMC_OK;
 }
+
+int imx_otp_handler(uint32_t smc_fid,
+		void *handle,
+		u_register_t x1,
+		u_register_t x2)
+{
+	int ret;
+	uint32_t fuse;
+
+	switch (smc_fid) {
+	case IMX_SIP_OTP_READ:
+		ret = sc_misc_otp_fuse_read(ipc_handle, x1, &fuse);
+		SMC_RET2(handle, ret, fuse);
+		break;
+	case IMX_SIP_OTP_WRITE:
+		ret = sc_misc_otp_fuse_write(ipc_handle, x1, x2);
+		SMC_RET1(handle, ret);
+		break;
+	default:
+		ret = SMC_UNK;
+		SMC_RET1(handle, ret);
+		break;
+	}
+
+	return ret;
+}

plat/imx/common/imx_sip_svc.c

@@ -34,6 +34,9 @@ static uintptr_t imx_sip_handler(unsigned int smc_fid,
 		break;
 	case  IMX_SIP_WAKEUP_SRC:
 		SMC_RET1(handle, imx_wakeup_src_handler(smc_fid, x1, x2, x3));
+	case IMX_SIP_OTP_READ:
+	case IMX_SIP_OTP_WRITE:
+		return imx_otp_handler(smc_fid, handle, x1, x2);
 #endif
 	default:
 		WARN("Unimplemented i.MX SiP Service Call: 0x%x\n", smc_fid);

plat/imx/common/include/imx_sip_svc.h

@@ -18,6 +18,9 @@
 #define IMX_SIP_WAKEUP_SRC_SCU		0x1
 #define IMX_SIP_WAKEUP_SRC_IRQSTEER	0x2
 
+#define IMX_SIP_OTP_READ		0xC200000A
+#define IMX_SIP_OTP_WRITE		0xC200000B
+
 #if (defined(PLAT_IMX8QM) || defined(PLAT_IMX8QX))
 int imx_cpufreq_handler(uint32_t smc_fid, u_register_t x1,
 			u_register_t x2, u_register_t x3);
@@ -25,6 +28,8 @@ int imx_srtc_handler(uint32_t smc_fid, void *handle, u_register_t x1,
 		     u_register_t x2, u_register_t x3, u_register_t x4);
 int imx_wakeup_src_handler(uint32_t smc_fid, u_register_t x1,
 			   u_register_t x2, u_register_t x3);
+int imx_otp_handler(uint32_t smc_fid, void *handle,
+		    u_register_t x1, u_register_t x2);
 #endif
 
 #endif /* __IMX_SIP_SVC_H__ */