CSS: Use SCMI AP core protocol to set the warm boot entrypoint

Change-Id: Iaebbeac1a1d6fbd531e5694b95ed068b7a193e62
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>

include/plat/arm/common/plat_arm.h

@@ -171,7 +171,6 @@ int arm_validate_psci_entrypoint(uintptr_t entrypoint);
 int arm_validate_ns_entrypoint(uintptr_t entrypoint);
 void arm_system_pwr_domain_save(void);
 void arm_system_pwr_domain_resume(void);
-void arm_program_trusted_mailbox(uintptr_t address);
 int arm_psci_read_mem_protect(int *enabled);
 int arm_nor_psci_write_mem_protect(int val);
 void arm_nor_psci_do_static_mem_protect(void);
@@ -250,6 +249,7 @@ void plat_arm_pwrc_setup(void);
 void plat_arm_interconnect_init(void);
 void plat_arm_interconnect_enter_coherency(void);
 void plat_arm_interconnect_exit_coherency(void);
+void plat_arm_program_trusted_mailbox(uintptr_t address);
 
 #if ARM_PLAT_MT
 unsigned int plat_arm_get_cpu_pe_count(u_register_t mpidr);

plat/arm/common/arm_bl1_setup.c

@@ -144,7 +144,7 @@ void bl1_plat_prepare_exit(entry_point_info_t *ep_info)
 	 * in order to release secondary CPUs from their holding pen and make
 	 * them jump there.
 	 */
-	arm_program_trusted_mailbox(ep_info->pc);
+	plat_arm_program_trusted_mailbox(ep_info->pc);
 	dsbsy();
 	sev();
 #endif

plat/arm/common/arm_common.mk

@@ -166,7 +166,7 @@ BL1_SOURCES		+=	drivers/arm/sp805/sp805.c			\
 				plat/arm/common/arm_err.c			\
 				plat/arm/common/arm_io_storage.c
 ifdef EL3_PAYLOAD_BASE
-# Need the arm_program_trusted_mailbox() function to release secondary CPUs from
+# Need the plat_arm_program_trusted_mailbox() function to release secondary CPUs from
 # their holding pen
 BL1_SOURCES		+=	plat/arm/common/arm_pm.c
 endif

plat/arm/common/arm_pm.c

@@ -14,8 +14,9 @@
 #include <platform_def.h>
 #include <psci.h>
 
-/* Allow ARM Standard platforms to override this function */
+/* Allow ARM Standard platforms to override these functions */
 #pragma weak plat_arm_psci_override_pm_ops
+#pragma weak plat_arm_program_trusted_mailbox
 
 /* Standard ARM platforms are expected to export plat_arm_psci_pm_ops */
 extern plat_psci_ops_t plat_arm_psci_pm_ops;
@@ -192,11 +193,11 @@ void arm_system_pwr_domain_resume(void)
 }
 
 /*******************************************************************************
- * Private function to program the mailbox for a cpu before it is released
+ * ARM platform function to program the mailbox for a cpu before it is released
  * from reset. This function assumes that the Trusted mail box base is within
  * the ARM_SHARED_RAM region
  ******************************************************************************/
-void arm_program_trusted_mailbox(uintptr_t address)
+void plat_arm_program_trusted_mailbox(uintptr_t address)
 {
 	uintptr_t *mailbox = (void *) PLAT_ARM_TRUSTED_MAILBOX_BASE;
 
@@ -221,6 +222,6 @@ int plat_setup_psci_ops(uintptr_t sec_entrypoint,
 	*psci_ops = plat_arm_psci_override_pm_ops(&plat_arm_psci_pm_ops);
 
 	/* Setup mailbox with entry point. */
-	arm_program_trusted_mailbox(sec_entrypoint);
+	plat_arm_program_trusted_mailbox(sec_entrypoint);
 	return 0;
 }

plat/arm/css/drivers/scp/css_pm_scmi.c

@@ -306,6 +306,28 @@ static scmi_channel_plat_info_t plat_css_scmi_plat_info = {
 		.ring_doorbell = &mhu_ring_doorbell,
 };
 
+static int scmi_ap_core_init(scmi_channel_t *ch)
+{
+#if PROGRAMMABLE_RESET_ADDRESS
+	uint32_t version;
+	int ret;
+
+	ret = scmi_proto_version(ch, SCMI_AP_CORE_PROTO_ID, &version);
+	if (ret != SCMI_E_SUCCESS) {
+		WARN("SCMI AP core protocol version message failed\n");
+		return -1;
+	}
+
+	if (!is_scmi_version_compatible(SCMI_AP_CORE_PROTO_VER, version)) {
+		WARN("SCMI AP core protocol version 0x%x incompatible with driver version 0x%x\n",
+			version, SCMI_AP_CORE_PROTO_VER);
+		return -1;
+	}
+	INFO("SCMI AP core protocol version 0x%x detected\n", version);
+#endif
+	return 0;
+}
+
 void plat_arm_pwrc_setup(void)
 {
 	channel.info = &plat_css_scmi_plat_info;
@@ -315,6 +337,10 @@ void plat_arm_pwrc_setup(void)
 		ERROR("SCMI Initialization failed\n");
 		panic();
 	}
+	if (scmi_ap_core_init(&channel) < 0) {
+		ERROR("SCMI AP core protocol initialization failed\n");
+		panic();
+	}
 }
 
 /******************************************************************************
@@ -386,3 +412,18 @@ int css_system_reset2(int is_vendor, int reset_type, u_register_t cookie)
 	 */
 	return 0;
 }
+
+#if PROGRAMMABLE_RESET_ADDRESS
+void plat_arm_program_trusted_mailbox(uintptr_t address)
+{
+	int ret;
+
+	assert(scmi_handle);
+	ret = scmi_ap_core_set_reset_addr(scmi_handle, address,
+		SCMI_AP_CORE_LOCK_ATTR);
+	if (ret != SCMI_E_SUCCESS) {
+		ERROR("CSS: Failed to program reset address: %d\n", ret);
+		panic();
+	}
+}
+#endif