plat/arm: remove weak implemention of 'plat_arm_psci_override_pm_ops' function

In order to allow Arm platforms to override the default list of PSCI
callbacks, remove the existing weak implementation of
'plat_arm_psci_override_pm_ops' function and let all the Arm platforms
implement their own 'plat_arm_psci_override_pm_ops' function.

For platforms that support SCMI protocol, the function
'css_scmi_override_pm_ops' can be additionally used as well to
override the default PSCI callbacks.

Change-Id: If7c27468bd51a00ea9c2a3716b5894163f5a9f3c
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>

plat/arm/board/fvp/fvp_pm.c

@@ -416,3 +416,8 @@ plat_psci_ops_t plat_arm_psci_pm_ops = {
 	.read_mem_protect	= arm_psci_read_mem_protect,
 	.write_mem_protect	= arm_nor_psci_write_mem_protect,
 };
+
+const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
+{
+	return ops;
+}

plat/arm/board/juno/juno_pm.c

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <plat_arm.h>
+#include <scmi.h>
+
+const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
+{
+	return css_scmi_override_pm_ops(ops);
+}

plat/arm/board/juno/platform.mk

@@ -27,6 +27,7 @@ endif
 CSS_USE_SCMI_SDS_DRIVER		:=	1
 
 PLAT_INCLUDES		:=	-Iplat/arm/board/juno/include		\
+				-Iplat/arm/css/drivers/scmi		\
 				-Iplat/arm/css/drivers/sds
 
 PLAT_BL_COMMON_SOURCES	:=	plat/arm/board/juno/${ARCH}/juno_helpers.S \
@@ -79,6 +80,7 @@ BL31_SOURCES		+=	drivers/cfi/v2m/v2m_flash.c		\
 				lib/cpus/aarch64/cortex_a57.S		\
 				lib/cpus/aarch64/cortex_a72.S		\
 				lib/utils/mem_region.c			\
+				plat/arm/board/juno/juno_pm.c		\
 				plat/arm/board/juno/juno_topology.c	\
 				plat/arm/common/arm_nor_psci_mem_protect.c \
 				${JUNO_GIC_SOURCES}			\

plat/arm/board/juno/sp_min/sp_min-juno.mk

@@ -10,6 +10,7 @@ BL32_SOURCES	+=	drivers/cfi/v2m/v2m_flash.c		\
 			lib/cpus/aarch32/cortex_a57.S		\
 			lib/cpus/aarch32/cortex_a72.S		\
 			lib/utils/mem_region.c			\
+			plat/arm/board/juno/juno_pm.c		\
 			plat/arm/board/juno/juno_topology.c	\
 			plat/arm/common/arm_nor_psci_mem_protect.c	\
 			plat/arm/soc/common/soc_css_security.c	\

plat/arm/board/n1sdp/n1sdp_bl31_setup.c

@@ -6,6 +6,7 @@
 
 #include "../../css/drivers/scmi/scmi.h"
 #include "../../css/drivers/mhu/css_mhu_doorbell.h"
+#include <plat_arm.h>
 #include <platform_def.h>
 
 static scmi_channel_plat_info_t n1sdp_scmi_plat_info = {
@@ -20,3 +21,8 @@ scmi_channel_plat_info_t *plat_css_get_scmi_info()
 {
 	return &n1sdp_scmi_plat_info;
 }
+
+const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
+{
+	return css_scmi_override_pm_ops(ops);
+}

plat/arm/common/arm_pm.c

@@ -14,7 +14,6 @@
 #include <psci.h>
 
 /* Allow ARM Standard platforms to override these functions */
-#pragma weak plat_arm_psci_override_pm_ops
 #pragma weak plat_arm_program_trusted_mailbox
 
 #if !ARM_RECOM_STATE_ID_ENC
@@ -132,14 +131,6 @@ int arm_validate_psci_entrypoint(uintptr_t entrypoint)
 		PSCI_E_INVALID_ADDRESS;
 }
 
-/******************************************************************************
- * Default definition on ARM standard platforms to override the plat_psci_ops.
- *****************************************************************************/
-const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
-{
-	return ops;
-}
-
 /******************************************************************************
  * Helper function to save the platform state before a system suspend. Save the
  * state of the system components which are not in the Always ON power domain.

plat/arm/css/drivers/scmi/scmi.h

@@ -8,6 +8,7 @@
 #define SCMI_H
 
 #include <bakery_lock.h>
+#include <psci.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <spinlock.h>
@@ -162,4 +163,7 @@ int scmi_ap_core_get_reset_addr(void *p, uint64_t *reset_addr, uint32_t *attr);
 /* API to get the platform specific SCMI channel information. */
 scmi_channel_plat_info_t *plat_css_get_scmi_info();
 
+/* API to override default PSCI callbacks for platforms that support SCMI. */
+const plat_psci_ops_t *css_scmi_override_pm_ops(plat_psci_ops_t *ops);
+
 #endif /* SCMI_H */

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

@@ -339,7 +339,7 @@ void __init plat_arm_pwrc_setup(void)
  * the SCMI driver, query capability via SCMI and modify the PSCI capability
  * based on that.
  *****************************************************************************/
-const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
+const plat_psci_ops_t *css_scmi_override_pm_ops(plat_psci_ops_t *ops)
 {
 	uint32_t msg_attr;
 	int ret;

plat/arm/css/sgi/sgi_bl31_setup.c

@@ -101,3 +101,8 @@ void bl31_platform_setup(void)
 	sgi_ras_intr_handler_setup();
 #endif
 }
+
+const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
+{
+	return css_scmi_override_pm_ops(ops);
+}

plat/arm/css/sgm/sgm_bl31_setup.c

@@ -47,3 +47,8 @@ void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
 
 	arm_bl31_early_platform_setup((void *)arg0, arg1, arg2, (void *)arg3);
 }
+
+const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops)
+{
+	return css_scmi_override_pm_ops(ops);
+}