plat/arm: Introduce the N1SDP.

This patch adds support for the N1SDP (NeoVerse N1 System Development
Platform). It is an initial port and additional features are expected
to be added later.

The port includes only BL31 support as the System Control Processor
(SCP) is expected to take the role of primary boatloader

Change-Id: Ife17d8215a7bfcc1420204a72205e7ef920d0c10
Signed-off-by: Deepak Pandey <Deepak.Pandey@arm.com>

plat/arm/board/n1sdp/aarch64/n1sdp_helper.S

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <cortex_ares.h>
+#include <cpu_macros.S>
+#include <platform_def.h>
+
+	.globl	plat_arm_calc_core_pos
+	.globl	plat_reset_handler
+
+	/* -----------------------------------------------------
+	 * unsigned int plat_arm_calc_core_pos(u_register_t mpidr)
+	 *
+	 * Helper function to calculate the core position.
+	 * (ClusterId * N1SDP_MAX_CPUS_PER_CLUSTER * N1SDP_MAX_PE_PER_CPU) +
+	 * (CPUId * N1SDP_MAX_PE_PER_CPU) +
+	 * ThreadId
+	 *
+	 * which can be simplified as:
+	 *
+	 * ((ClusterId * N1SDP_MAX_CPUS_PER_CLUSTER + CPUId) *
+	 * N1SDP_MAX_PE_PER_CPU) + ThreadId
+	 * ------------------------------------------------------
+	 */
+
+func plat_arm_calc_core_pos
+	mov	x3, x0
+
+	/*
+	 * The MT bit in MPIDR is always set for n1sdp and the
+	 * affinity level 0 corresponds to thread affinity level.
+	 */
+
+	/* Extract individual affinity fields from MPIDR */
+	ubfx	x0, x3, #MPIDR_AFF0_SHIFT, #MPIDR_AFFINITY_BITS
+	ubfx	x1, x3, #MPIDR_AFF1_SHIFT, #MPIDR_AFFINITY_BITS
+	ubfx	x2, x3, #MPIDR_AFF2_SHIFT, #MPIDR_AFFINITY_BITS
+
+	/* Compute linear position */
+	mov	x4, #N1SDP_MAX_CPUS_PER_CLUSTER
+	madd	x1, x2, x4, x1
+	mov	x5, #N1SDP_MAX_PE_PER_CPU
+	madd	x0, x1, x5, x0
+	ret
+endfunc plat_arm_calc_core_pos
+
+	/* -----------------------------------------------------
+	 * void plat_reset_handler(void);
+	 *
+	 * Determine the CPU MIDR and disable power down bit for
+	 * that CPU.
+	 * -----------------------------------------------------
+	 */
+
+func plat_reset_handler
+	jump_if_cpu_midr CORTEX_ARES_MIDR, ARES
+	ret
+
+	/* -----------------------------------------------------
+	 * Disable CPU power down bit in power control register
+	 * -----------------------------------------------------
+	 */
+ARES:
+	mrs	x0, CORTEX_ARES_CPUPWRCTLR_EL1
+	bic	x0, x0, #CORTEX_ARES_CORE_PWRDN_EN_MASK
+	msr	CORTEX_ARES_CPUPWRCTLR_EL1, x0
+	isb
+	ret
+endfunc plat_reset_handler

plat/arm/board/n1sdp/include/plat_macros.S

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef __PLAT_MACROS_S__
+#define __PLAT_MACROS_S__
+
+#include <css_macros.S>
+
+/* ---------------------------------------------
+ * The below required platform porting macro
+ * prints out relevant platform registers
+ * whenever an unhandled exception is taken in
+ * BL31.
+ *
+ * There are currently no platform specific regs
+ * to print.
+ * ---------------------------------------------
+ */
+	.macro plat_crash_print_regs
+	.endm
+#endif /* __PLAT_MACROS_S__ */

plat/arm/board/n1sdp/include/platform_def.h

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __PLATFORM_DEF_H__
+#define __PLATFORM_DEF_H__
+
+#include <arm_def.h>
+#include <board_css_def.h>
+#include <css_def.h>
+
+#if CSS_USE_SCMI_SDS_DRIVER
+#define N1SDP_SCMI_PAYLOAD_BASE			0x45400000
+#else
+#define PLAT_CSS_SCP_COM_SHARED_MEM_BASE	0x45400000
+#endif
+
+#define PLAT_ARM_TRUSTED_SRAM_SIZE		0x00080000	/* 512 KB */
+#define PLAT_ARM_MAX_BL31_SIZE			0X20000
+
+
+/*******************************************************************************
+ * N1SDP topology related constants
+ ******************************************************************************/
+#define N1SDP_MAX_CPUS_PER_CLUSTER		2
+#define PLAT_ARM_CLUSTER_COUNT			2
+#define N1SDP_MAX_PE_PER_CPU			1
+
+#define PLATFORM_CORE_COUNT			(PLAT_ARM_CLUSTER_COUNT *	\
+						N1SDP_MAX_CPUS_PER_CLUSTER *	\
+						N1SDP_MAX_PE_PER_CPU)
+
+
+/*
+ * PLAT_ARM_MMAP_ENTRIES depends on the number of entries in the
+ * plat_arm_mmap array defined for each BL stage.
+ */
+#define PLAT_ARM_MMAP_ENTRIES			3
+#define MAX_XLAT_TABLES				4
+
+#define PLATFORM_STACK_SIZE			0x400
+
+#define PLAT_ARM_NSTIMER_FRAME_ID		0
+#define PLAT_CSS_MHU_BASE			0x45000000
+#define PLAT_MAX_PWR_LVL			1
+
+#define PLAT_ARM_G1S_IRQS			ARM_G1S_IRQS,			\
+						CSS_IRQ_MHU
+#define PLAT_ARM_G0_IRQS			ARM_G0_IRQS
+
+#define PLAT_ARM_G1S_IRQ_PROPS(grp)		CSS_G1S_IRQ_PROPS(grp)
+#define PLAT_ARM_G0_IRQ_PROPS(grp)		ARM_G0_IRQ_PROPS(grp)
+
+
+#define N1SDP_DEVICE_BASE			(0x20000000)
+#define N1SDP_DEVICE_SIZE			(0x20000000)
+#define N1SDP_MAP_DEVICE			MAP_REGION_FLAT(	\
+						N1SDP_DEVICE_BASE,	\
+						N1SDP_DEVICE_SIZE,	\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
+/* GIC related constants */
+#define PLAT_ARM_GICD_BASE			0x30000000
+#define PLAT_ARM_GICC_BASE			0x2C000000
+#define PLAT_ARM_GICR_BASE			0x300C0000
+
+/* Platform ID address */
+#define SSC_VERSION				(SSC_REG_BASE + SSC_VERSION_OFFSET)
+#endif /* __PLATFORM_DEF_H__ */

plat/arm/board/n1sdp/n1sdp_bl31_setup.c

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "../../css/drivers/scmi/scmi.h"
+#include "../../css/drivers/mhu/css_mhu_doorbell.h"
+#include <platform_def.h>
+
+static scmi_channel_plat_info_t n1sdp_scmi_plat_info = {
+		.scmi_mbx_mem = N1SDP_SCMI_PAYLOAD_BASE,
+		.db_reg_addr = PLAT_CSS_MHU_BASE + CSS_SCMI_MHU_DB_REG_OFF,
+		.db_preserve_mask = 0xfffffffe,
+		.db_modify_mask = 0x1,
+		.ring_doorbell = &mhu_ring_doorbell,
+};
+
+scmi_channel_plat_info_t *plat_css_get_scmi_info()
+{
+	return &n1sdp_scmi_plat_info;
+}

plat/arm/board/n1sdp/n1sdp_interconnect.c

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+
+/*
+ * For N1SDP which support FCM (with automatic interconnect enter/exit),
+ * we should not do anything in these interface functions.
+ * They are used to override the weak functions in cci drivers.
+ */
+
+/******************************************************************************
+ * Helper function to initialize ARM interconnect driver.
+ *****************************************************************************/
+void plat_arm_interconnect_init(void)
+{
+}
+
+/******************************************************************************
+ * Helper function to place current master into coherency
+ *****************************************************************************/
+void plat_arm_interconnect_enter_coherency(void)
+{
+}
+
+/******************************************************************************
+ * Helper function to remove current master from coherency
+ *****************************************************************************/
+void plat_arm_interconnect_exit_coherency(void)
+{
+}

plat/arm/board/n1sdp/n1sdp_plat.c

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arm_def.h>
+#include <bl_common.h>
+#include <debug.h>
+#include <plat_arm.h>
+#include <platform.h>
+#include <platform_def.h>
+
+/*
+ * Table of regions to map using the MMU.
+ * Replace or extend the below regions as required
+ */
+
+const mmap_region_t plat_arm_mmap[] = {
+	ARM_MAP_SHARED_RAM,
+	N1SDP_MAP_DEVICE,
+	SOC_CSS_MAP_DEVICE,
+	{0}
+};
+

plat/arm/board/n1sdp/n1sdp_security.c

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * TZC programming is currently not done.
+ */
+void plat_arm_security_setup(void)
+{
+}

plat/arm/board/n1sdp/n1sdp_topology.c

+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <plat_arm.h>
+
+/* Topology */
+typedef struct n1sdp_topology {
+	const unsigned char *power_tree;
+	unsigned int plat_cluster_core_count;
+} n1sdp_topology_t;
+
+/*
+ * The power domain tree descriptor. The cluster power domains are
+ * arranged so that when the PSCI generic code creates the power domain tree,
+ * the indices of the CPU power domain nodes it allocates match the linear
+ * indices returned by plat_core_pos_by_mpidr().
+ */
+const unsigned char n1sdp_pd_tree_desc[] = {
+	PLAT_ARM_CLUSTER_COUNT,
+	N1SDP_MAX_CPUS_PER_CLUSTER,
+	N1SDP_MAX_CPUS_PER_CLUSTER
+};
+
+/* Topology configuration for n1sdp */
+const n1sdp_topology_t n1sdp_topology = {
+	.power_tree = n1sdp_pd_tree_desc,
+	.plat_cluster_core_count = N1SDP_MAX_CPUS_PER_CLUSTER
+};
+
+/*******************************************************************************
+ * This function returns the topology tree information.
+ ******************************************************************************/
+const unsigned char *plat_get_power_domain_tree_desc(void)
+{
+	return n1sdp_topology.power_tree;
+}
+
+/*******************************************************************************
+ * This function returns the core count within the cluster corresponding to
+ * `mpidr`.
+ ******************************************************************************/
+unsigned int plat_arm_get_cluster_core_count(u_register_t mpidr)
+{
+	return n1sdp_topology.plat_cluster_core_count;
+}
+
+/*******************************************************************************
+ * The array mapping platform core position (implemented by plat_my_core_pos())
+ * to the SCMI power domain ID implemented by SCP.
+ ******************************************************************************/
+const uint32_t plat_css_core_pos_to_scmi_dmn_id_map[PLATFORM_CORE_COUNT] = {
+	0, 1, 2, 3};

plat/arm/board/n1sdp/platform.mk

+#
+# Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+
+N1SDP_BASE		:=	plat/arm/board/n1sdp
+
+INTERCONNECT_SOURCES	:=	${N1SDP_BASE}/n1sdp_interconnect.c
+
+PLAT_INCLUDES		:=	-I${N1SDP_BASE}/include
+
+
+N1SDP_CPU_SOURCES	:=	lib/cpus/aarch64/cortex_ares.S
+
+
+N1SDP_GIC_SOURCES	:=	drivers/arm/gic/common/gic_common.c	\
+				drivers/arm/gic/v3/gicv3_main.c		\
+				drivers/arm/gic/v3/gicv3_helpers.c	\
+				plat/common/plat_gicv3.c		\
+				plat/arm/common/arm_gicv3.c		\
+				drivers/arm/gic/v3/gic600.c
+
+PLAT_BL_COMMON_SOURCES	:=	${N1SDP_BASE}/n1sdp_plat.c	        \
+				${N1SDP_BASE}/aarch64/n1sdp_helper.S
+
+
+BL31_SOURCES		:=	${N1SDP_CPU_SOURCES}			\
+				${INTERCONNECT_SOURCES}			\
+				${N1SDP_GIC_SOURCES}			\
+				${N1SDP_BASE}/n1sdp_bl31_setup.c	        \
+				${N1SDP_BASE}/n1sdp_topology.c	        \
+				${N1SDP_BASE}/n1sdp_security.c
+
+
+# TF-A not required to load the SCP Images
+override CSS_LOAD_SCP_IMAGES	  	:=	0
+
+# BL1/BL2 Image not a part of the capsule Image for n1sdp
+override NEED_BL1		  	:=	no
+override NEED_BL2		  	:=	no
+override NEED_BL2U		  	:=	no
+
+#TFA for n1sdp starts from BL31
+override RESET_TO_BL31            	:=	1
+
+# 32 bit mode not supported
+override CTX_INCLUDE_AARCH32_REGS 	:=	0
+
+override ARM_PLAT_MT              	:=	1
+
+# Select SCMI/SDS drivers instead of SCPI/BOM driver for communicating with the
+# SCP during power management operations and for SCP RAM Firmware transfer.
+CSS_USE_SCMI_SDS_DRIVER		  	:=	1
+
+# System coherency is managed in hardware
+HW_ASSISTED_COHERENCY			:=	1
+
+# When building for systems with hardware-assisted coherency, there's no need to
+# use USE_COHERENT_MEM. Require that USE_COHERENT_MEM must be set to 0 too.
+USE_COHERENT_MEM			:=	0
+include plat/arm/common/arm_common.mk
+include plat/arm/css/common/css_common.mk
+include plat/arm/soc/common/soc_css.mk
+include plat/arm/board/common/board_common.mk
+