rockchip: support plat SIP runtime service

Software executing in the normal world and in the trusted world at
exception levels lower than EL3 will request runtime services using the
SMC instruction.

See the documentation here:
https://github.com/ARM-software/arm-trusted-firmware/blob/master/docs/
rt-svc-writers-guide.md

This to be implemented as an EL3 Runtime Service in rockchip BL31
platform port, using the "SiP Service Call" range as specified in the
SMC Calling Convention.
This doesn't support any SMC yet, we will support it in later.

Change-Id: I0a638dd0b653c28b08f79d89f77ed7c69864017d

2 files changed, 151 insertions, 0 deletions

diff --git a/plat/rockchip/common/include/rockchip_sip_svc.h b/plat/rockchip/common/include/rockchip_sip_svc.h
new file mode 100644
index 00000000..9e31082a
--- /dev/null
+++ b/plat/rockchip/common/include/rockchip_sip_svc.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __ROCKCHIP_SIP_SVC_H__
+#define __ROCKCHIP_SIP_SVC_H__
+
+/* SMC function IDs for SiP Service queries */
+#define SIP_SVC_CALL_COUNT		0x8200ff00
+#define SIP_SVC_UID			0x8200ff01
+#define SIP_SVC_VERSION			0x8200ff03
+
+/* rockchip SiP Service Calls version numbers */
+#define RK_SIP_SVC_VERSION_MAJOR	0x0
+#define RK_SIP_SVC_VERSION_MINOR	0x1
+
+/* Number of ROCKCHIP SiP Calls implemented */
+#define RK_COMMON_SIP_NUM_CALLS		0x3
+
+enum {
+	RK_SIP_E_SUCCESS = 0,
+	RK_SIP_E_INVALID_PARAM = -1
+};
+
+#endif
diff --git a/plat/rockchip/common/rockchip_sip_svc.c b/plat/rockchip/common/rockchip_sip_svc.c
new file mode 100644
index 00000000..cbc91057
--- /dev/null
+++ b/plat/rockchip/common/rockchip_sip_svc.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <debug.h>
+#include <mmio.h>
+#include <plat_sip_calls.h>
+#include <rockchip_sip_svc.h>
+#include <runtime_svc.h>
+#include <uuid.h>
+
+/* Rockchip SiP Service UUID */
+DEFINE_SVC_UUID(rk_sip_svc_uid,
+		0xe86fc7e2, 0x313e, 0x11e6, 0xb7, 0x0d,
+		0x8f, 0x88, 0xee, 0x74, 0x7b, 0x72);
+
+#pragma weak rockchip_plat_sip_handler
+uint64_t rockchip_plat_sip_handler(uint32_t smc_fid,
+				   uint64_t x1,
+				   uint64_t x2,
+				   uint64_t x3,
+				   uint64_t x4,
+				   void *cookie,
+				   void *handle,
+				   uint64_t flags)
+{
+	ERROR("%s: unhandled SMC (0x%x)\n", __func__, smc_fid);
+	SMC_RET1(handle, SMC_UNK);
+}
+
+/*
+ * This function is responsible for handling all SiP calls from the NS world
+ */
+uint64_t sip_smc_handler(uint32_t smc_fid,
+			 uint64_t x1,
+			 uint64_t x2,
+			 uint64_t x3,
+			 uint64_t x4,
+			 void *cookie,
+			 void *handle,
+			 uint64_t flags)
+{
+	uint32_t ns;
+
+	/* Determine which security state this SMC originated from */
+	ns = is_caller_non_secure(flags);
+	if (!ns)
+		SMC_RET1(handle, SMC_UNK);
+
+	switch (smc_fid) {
+	case SIP_SVC_CALL_COUNT:
+		/* Return the number of Rockchip SiP Service Calls. */
+		SMC_RET1(handle,
+			 RK_COMMON_SIP_NUM_CALLS + RK_PLAT_SIP_NUM_CALLS);
+
+	case SIP_SVC_UID:
+		/* Return UID to the caller */
+		SMC_UUID_RET(handle, rk_sip_svc_uid);
+		break;
+
+	case SIP_SVC_VERSION:
+		/* Return the version of current implementation */
+		SMC_RET2(handle, RK_SIP_SVC_VERSION_MAJOR,
+			RK_SIP_SVC_VERSION_MINOR);
+		break;
+
+	default:
+		return rockchip_plat_sip_handler(smc_fid, x1, x2, x3, x4,
+			cookie, handle, flags);
+	}
+}
+
+/* Define a runtime service descriptor for fast SMC calls */
+DECLARE_RT_SVC(
+	rockchip_sip_svc,
+	OEN_SIP_START,
+	OEN_SIP_END,
+	SMC_TYPE_FAST,
+	NULL,
+	sip_smc_handler
+);