amlogic: g12a: Add support for the S905X2 (G12A) platform

Introduce the preliminary support for the Amlogic S905X2 (G12A) SoC.

This port is a minimal implementation of BL31 capable of booting
mainline U-Boot and Linux. Tested on a SEI510 board.
Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Change-Id: Ife958f10e815a4530292c45446adb71239f3367f

docs/maintainers.rst

@@ -48,6 +48,14 @@ Amlogic Meson S905x (GXL) platform port
 :F: drivers/amlogic/gxl
 :F: plat/amlogic/gxl/
 
+Amlogic Meson S905X2 (G12A) platform port
+---------------------------------------
+:M: Carlo Caione <ccaione@baylibre.com>
+:G: `carlo.caione`_
+:F: docs/plat/meson-g12a.rst
+:F: drivers/amlogic/g12a
+:F: plat/amlogic/g12a/
+
 Armv7-A architecture port
 -------------------------
 :M: Etienne Carriere <etienne.carriere@linaro.org>

docs/plat/meson-g12a.rst

+Amlogic Meson S905X2 (G12A)
+==========================
+
+The Amlogic Meson S905X2 is a SoC with a quad core Arm Cortex-A53 running at
+~1.8GHz. It also contains a Cortex-M3 used as SCP.
+
+This port is a minimal implementation of BL31 capable of booting mainline U-Boot
+and Linux:
+
+- SCPI support.
+- Basic PSCI support (CPU_ON, CPU_OFF, SYSTEM_RESET, SYSTEM_OFF). Note that CPU0
+  can't be turned off, so there is a workaround to hide this from the caller.
+- GICv2 driver set up.
+- Basic SIP services (read efuse data, enable/disable JTAG).
+
+In order to build it:
+
+.. code:: shell
+
+    CROSS_COMPILE=aarch64-linux-gnu- make DEBUG=1 PLAT=g12a
+
+This port has been tested on a SEI510 board. After building it, follow the
+instructions in the `gxlimg repository` or `U-Boot repository`_, replacing the
+mentioned **bl31.img** by the one built from this port.
+
+.. _gxlimg repository: https://github.com/repk/gxlimg/blob/master/README.g12a
+.. _U-Boot repository: https://github.com/u-boot/u-boot/blob/master/board/amlogic/sei510/README

plat/amlogic/g12a/g12a_bl31_setup.c

+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <common/bl_common.h>
+#include <common/interrupt_props.h>
+#include <drivers/arm/gicv2.h>
+#include <lib/mmio.h>
+#include <lib/xlat_tables/xlat_mmu_helpers.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+
+#include "aml_private.h"
+
+/*
+ * Placeholder variables for copying the arguments that have been passed to
+ * BL31 from BL2.
+ */
+static entry_point_info_t bl32_image_ep_info;
+static entry_point_info_t bl33_image_ep_info;
+static image_info_t bl30_image_info;
+static image_info_t bl301_image_info;
+
+/*******************************************************************************
+ * Return a pointer to the 'entry_point_info' structure of the next image for
+ * the security state specified. BL33 corresponds to the non-secure image type
+ * while BL32 corresponds to the secure image type. A NULL pointer is returned
+ * if the image does not exist.
+ ******************************************************************************/
+entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
+{
+	entry_point_info_t *next_image_info;
+
+	next_image_info = (type == NON_SECURE) ?
+			  &bl33_image_ep_info : &bl32_image_ep_info;
+
+	/* None of the images can have 0x0 as the entrypoint. */
+	if (next_image_info->pc != 0U)
+		return next_image_info;
+
+	return NULL;
+}
+
+/*******************************************************************************
+ * Perform any BL31 early platform setup. Here is an opportunity to copy
+ * parameters passed by the calling EL (S-EL1 in BL2 & S-EL3 in BL1) before
+ * they are lost (potentially). This needs to be done before the MMU is
+ * initialized so that the memory layout can be used while creating page
+ * tables. BL2 has flushed this information to memory, so we are guaranteed
+ * to pick up good data.
+ ******************************************************************************/
+struct g12a_bl31_param {
+	param_header_t h;
+	image_info_t *bl31_image_info;
+	entry_point_info_t *bl32_ep_info;
+	image_info_t *bl32_image_info;
+	entry_point_info_t *bl33_ep_info;
+	image_info_t *bl33_image_info;
+	image_info_t *scp_image_info[];
+};
+
+void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
+				u_register_t arg2, u_register_t arg3)
+{
+	struct g12a_bl31_param *from_bl2;
+
+	/* Initialize the console to provide early debug support */
+	aml_console_init();
+
+	from_bl2 = (struct g12a_bl31_param *)arg0;
+
+	/* Check params passed from BL2 are not NULL. */
+	assert(from_bl2 != NULL);
+	assert(from_bl2->h.type == PARAM_BL31);
+	assert(from_bl2->h.version >= VERSION_1);
+
+	/*
+	 * Copy BL32 and BL33 entry point information. It is stored in Secure
+	 * RAM, in BL2's address space.
+	 */
+	bl32_image_ep_info = *from_bl2->bl32_ep_info;
+	bl33_image_ep_info = *from_bl2->bl33_ep_info;
+
+	if (bl33_image_ep_info.pc == 0U) {
+		ERROR("BL31: BL33 entrypoint not obtained from BL2\n");
+		panic();
+	}
+
+	bl30_image_info = *from_bl2->scp_image_info[0];
+	bl301_image_info = *from_bl2->scp_image_info[1];
+}
+
+void bl31_plat_arch_setup(void)
+{
+	aml_setup_page_tables();
+
+	enable_mmu_el3(0);
+}
+
+/*******************************************************************************
+ * GICv2 driver setup information
+ ******************************************************************************/
+static const interrupt_prop_t g12a_interrupt_props[] = {
+	INTR_PROP_DESC(IRQ_SEC_PHY_TIMER, GIC_HIGHEST_SEC_PRIORITY,
+		       GICV2_INTR_GROUP0, GIC_INTR_CFG_LEVEL),
+	INTR_PROP_DESC(IRQ_SEC_SGI_0, GIC_HIGHEST_SEC_PRIORITY,
+		       GICV2_INTR_GROUP0, GIC_INTR_CFG_LEVEL),
+	INTR_PROP_DESC(IRQ_SEC_SGI_1, GIC_HIGHEST_SEC_PRIORITY,
+		       GICV2_INTR_GROUP0, GIC_INTR_CFG_LEVEL),
+	INTR_PROP_DESC(IRQ_SEC_SGI_2, GIC_HIGHEST_SEC_PRIORITY,
+		       GICV2_INTR_GROUP0, GIC_INTR_CFG_LEVEL),
+	INTR_PROP_DESC(IRQ_SEC_SGI_3, GIC_HIGHEST_SEC_PRIORITY,
+		       GICV2_INTR_GROUP0, GIC_INTR_CFG_LEVEL),
+	INTR_PROP_DESC(IRQ_SEC_SGI_4, GIC_HIGHEST_SEC_PRIORITY,
+		       GICV2_INTR_GROUP0, GIC_INTR_CFG_LEVEL),
+	INTR_PROP_DESC(IRQ_SEC_SGI_5, GIC_HIGHEST_SEC_PRIORITY,
+		       GICV2_INTR_GROUP0, GIC_INTR_CFG_LEVEL),
+	INTR_PROP_DESC(IRQ_SEC_SGI_6, GIC_HIGHEST_SEC_PRIORITY,
+		       GICV2_INTR_GROUP0, GIC_INTR_CFG_LEVEL),
+	INTR_PROP_DESC(IRQ_SEC_SGI_7, GIC_HIGHEST_SEC_PRIORITY,
+		       GICV2_INTR_GROUP0, GIC_INTR_CFG_LEVEL)
+};
+
+static const gicv2_driver_data_t g12a_gic_data = {
+	.gicd_base = AML_GICD_BASE,
+	.gicc_base = AML_GICC_BASE,
+	.interrupt_props = g12a_interrupt_props,
+	.interrupt_props_num = ARRAY_SIZE(g12a_interrupt_props)
+};
+
+void bl31_platform_setup(void)
+{
+	aml_mhu_secure_init();
+
+	gicv2_driver_init(&g12a_gic_data);
+	gicv2_distif_init();
+	gicv2_pcpu_distif_init();
+	gicv2_cpuif_enable();
+}

plat/amlogic/g12a/g12a_common.c

+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <bl31/interrupt_mgmt.h>
+#include <common/bl_common.h>
+#include <common/ep_info.h>
+#include <lib/mmio.h>
+#include <lib/xlat_tables/xlat_tables_v2.h>
+#include <platform_def.h>
+#include <stdint.h>
+
+/*******************************************************************************
+ * Platform memory map regions
+ ******************************************************************************/
+#define MAP_NSDRAM0		MAP_REGION_FLAT(AML_NSDRAM0_BASE,		\
+						AML_NSDRAM0_SIZE,		\
+						MT_MEMORY | MT_RW | MT_NS)
+
+#define MAP_NS_SHARE_MEM	MAP_REGION_FLAT(AML_NS_SHARE_MEM_BASE,		\
+						AML_NS_SHARE_MEM_SIZE,		\
+						MT_MEMORY | MT_RW | MT_NS)
+
+#define MAP_SEC_SHARE_MEM	MAP_REGION_FLAT(AML_SEC_SHARE_MEM_BASE,		\
+						AML_SEC_SHARE_MEM_SIZE,		\
+						MT_MEMORY | MT_RW | MT_SECURE)
+
+#define MAP_SEC_DEVICE0		MAP_REGION_FLAT(AML_SEC_DEVICE0_BASE,		\
+						AML_SEC_DEVICE0_SIZE,		\
+						MT_DEVICE | MT_RW)
+
+#define MAP_HDCP_RX		MAP_REGION_FLAT(AML_HDCP_RX_BASE,		\
+						AML_HDCP_RX_SIZE,		\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
+#define MAP_HDCP_TX		MAP_REGION_FLAT(AML_HDCP_TX_BASE,		\
+						AML_HDCP_TX_SIZE,		\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
+#define MAP_GIC_DEVICE		MAP_REGION_FLAT(AML_GIC_DEVICE_BASE,		\
+						AML_GIC_DEVICE_SIZE,		\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
+#define MAP_SEC_DEVICE1		MAP_REGION_FLAT(AML_SEC_DEVICE1_BASE,		\
+						AML_SEC_DEVICE1_SIZE,		\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
+#define MAP_SEC_DEVICE2		MAP_REGION_FLAT(AML_SEC_DEVICE2_BASE,		\
+						AML_SEC_DEVICE2_SIZE,		\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
+#define MAP_TZRAM		MAP_REGION_FLAT(AML_TZRAM_BASE,			\
+						AML_TZRAM_SIZE,			\
+						MT_DEVICE | MT_RW | MT_SECURE)
+
+static const mmap_region_t g12a_mmap[] = {
+	MAP_NSDRAM0,
+	MAP_NS_SHARE_MEM,
+	MAP_SEC_SHARE_MEM,
+	MAP_SEC_DEVICE0,
+	MAP_HDCP_RX,
+	MAP_HDCP_TX,
+	MAP_GIC_DEVICE,
+	MAP_SEC_DEVICE1,
+	MAP_SEC_DEVICE2,
+	MAP_TZRAM,
+	{0}
+};
+
+/*******************************************************************************
+ * Per-image regions
+ ******************************************************************************/
+#define MAP_BL31	MAP_REGION_FLAT(BL31_BASE,					\
+					BL31_END - BL31_BASE,				\
+					MT_MEMORY | MT_RW | MT_SECURE)
+
+#define MAP_BL_CODE	MAP_REGION_FLAT(BL_CODE_BASE,					\
+					BL_CODE_END - BL_CODE_BASE,			\
+					MT_CODE | MT_SECURE)
+
+#define MAP_BL_RO_DATA	MAP_REGION_FLAT(BL_RO_DATA_BASE,				\
+					BL_RO_DATA_END - BL_RO_DATA_BASE,		\
+					MT_RO_DATA | MT_SECURE)
+
+#define MAP_BL_COHERENT	MAP_REGION_FLAT(BL_COHERENT_RAM_BASE,				\
+					BL_COHERENT_RAM_END - BL_COHERENT_RAM_BASE, 	\
+					MT_DEVICE | MT_RW | MT_SECURE)
+
+/*******************************************************************************
+ * Function that sets up the translation tables.
+ ******************************************************************************/
+void aml_setup_page_tables(void)
+{
+#if IMAGE_BL31
+	const mmap_region_t g12a_bl_mmap[] = {
+		MAP_BL31,
+		MAP_BL_CODE,
+		MAP_BL_RO_DATA,
+#if USE_COHERENT_MEM
+		MAP_BL_COHERENT,
+#endif
+		{0}
+	};
+#endif
+
+	mmap_add(g12a_bl_mmap);
+
+	mmap_add(g12a_mmap);
+
+	init_xlat_tables();
+}
+
+/*******************************************************************************
+ * Function that returns the system counter frequency
+ ******************************************************************************/
+unsigned int plat_get_syscnt_freq2(void)
+{
+	mmio_clrbits_32(AML_SYS_CPU_CFG7, ~0xFDFFFFFF);
+	mmio_clrbits_32(AML_AO_TIMESTAMP_CNTL, ~0xFFFFFE00);
+
+	return AML_OSC24M_CLK_IN_HZ;
+}

plat/amlogic/g12a/g12a_def.h

+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef G12A_DEF_H
+#define G12A_DEF_H
+
+#include <lib/utils_def.h>
+
+/*******************************************************************************
+ * System oscillator
+ ******************************************************************************/
+#define AML_OSC24M_CLK_IN_HZ			ULL(24000000) /* 24 MHz */
+
+/*******************************************************************************
+ * Memory regions
+ ******************************************************************************/
+#define AML_HDCP_RX_BASE			UL(0xFFE0D000)
+#define AML_HDCP_RX_SIZE			UL(0x00002000)
+
+#define AML_HDCP_TX_BASE			UL(0xFFE01000)
+#define AML_HDCP_TX_SIZE			UL(0x00001000)
+
+#define AML_NS_SHARE_MEM_BASE			UL(0x05000000)
+#define AML_NS_SHARE_MEM_SIZE			UL(0x00100000)
+
+#define AML_SEC_SHARE_MEM_BASE			UL(0x05200000)
+#define AML_SEC_SHARE_MEM_SIZE			UL(0x00100000)
+
+#define AML_GIC_DEVICE_BASE			UL(0xFFC00000)
+#define AML_GIC_DEVICE_SIZE			UL(0x00008000)
+
+#define AML_NSDRAM0_BASE			UL(0x01000000)
+#define AML_NSDRAM0_SIZE			UL(0x0F000000)
+
+#define BL31_BASE				UL(0x05100000)
+#define BL31_SIZE				UL(0x00100000)
+#define BL31_LIMIT				(BL31_BASE + BL31_SIZE)
+
+/* Shared memory used for SMC services */
+#define AML_SHARE_MEM_INPUT_BASE		UL(0x050FE000)
+#define AML_SHARE_MEM_OUTPUT_BASE		UL(0x050FF000)
+
+#define AML_SEC_DEVICE0_BASE			UL(0xFFD00000)
+#define AML_SEC_DEVICE0_SIZE			UL(0x00026000)
+
+#define AML_SEC_DEVICE1_BASE			UL(0xFF800000)
+#define AML_SEC_DEVICE1_SIZE			UL(0x0000A000)
+
+#define AML_TZRAM_BASE				UL(0xFFFA0000)
+#define AML_TZRAM_SIZE				UL(0x00048000)
+
+/* Mailboxes */
+#define AML_MHU_SECURE_SCP_TO_AP_PAYLOAD	UL(0xFFFE7800)
+#define AML_MHU_SECURE_AP_TO_SCP_PAYLOAD	UL(0xFFFE7A00)
+#define AML_PSCI_MAILBOX_BASE			UL(0xFFFE7F00)
+
+#define AML_SEC_DEVICE2_BASE			UL(0xFF620000)
+#define AML_SEC_DEVICE2_SIZE			UL(0x00028000)
+
+/*******************************************************************************
+ * GIC-400 and interrupt handling related constants
+ ******************************************************************************/
+#define AML_GICD_BASE				UL(0xFFC01000)
+#define AML_GICC_BASE				UL(0xFFC02000)
+
+#define IRQ_SEC_PHY_TIMER			29
+
+#define IRQ_SEC_SGI_0				8
+#define IRQ_SEC_SGI_1				9
+#define IRQ_SEC_SGI_2				10
+#define IRQ_SEC_SGI_3				11
+#define IRQ_SEC_SGI_4				12
+#define IRQ_SEC_SGI_5				13
+#define IRQ_SEC_SGI_6				14
+#define IRQ_SEC_SGI_7				15
+#define IRQ_SEC_SGI_8				16
+
+/*******************************************************************************
+ * UART definitions
+ ******************************************************************************/
+#define AML_UART0_AO_BASE			UL(0xFF803000)
+#define AML_UART0_AO_CLK_IN_HZ			AML_OSC24M_CLK_IN_HZ
+#define AML_UART_BAUDRATE			U(115200)
+
+/*******************************************************************************
+ * Memory-mapped I/O Registers
+ ******************************************************************************/
+#define AML_AO_TIMESTAMP_CNTL			UL(0xFF8000B4)
+
+#define AML_SYS_CPU_CFG7			UL(0xFF634664)
+
+#define AML_AO_RTI_STATUS_REG3			UL(0xFF80001C)
+#define AML_AO_RTI_SCP_STAT			UL(0xFF80023C)
+#define AML_AO_RTI_SCP_READY_OFF		U(0x14)
+#define AML_A0_RTI_SCP_READY_MASK		U(3)
+#define AML_AO_RTI_SCP_IS_READY(v)					\
+	((((v) >> AML_AO_RTI_SCP_READY_OFF) &				\
+	AML_A0_RTI_SCP_READY_MASK) == AML_A0_RTI_SCP_READY_MASK)
+
+#define AML_HIU_MAILBOX_SET_0			UL(0xFF63C404)
+#define AML_HIU_MAILBOX_STAT_0			UL(0xFF63C408)
+#define AML_HIU_MAILBOX_CLR_0			UL(0xFF63C40C)
+#define AML_HIU_MAILBOX_SET_3			UL(0xFF63C428)
+#define AML_HIU_MAILBOX_STAT_3			UL(0xFF63C42C)
+#define AML_HIU_MAILBOX_CLR_3			UL(0xFF63C430)
+
+#define AML_SHA_DMA_BASE			UL(0xFF63E000)
+#define AML_SHA_DMA_DESC			(AML_SHA_DMA_BASE + 0x08)
+#define AML_SHA_DMA_STATUS			(AML_SHA_DMA_BASE + 0x28)
+
+/*******************************************************************************
+ * System Monitor Call IDs and arguments
+ ******************************************************************************/
+#define AML_SM_GET_SHARE_MEM_INPUT_BASE		U(0x82000020)
+#define AML_SM_GET_SHARE_MEM_OUTPUT_BASE	U(0x82000021)
+
+#define AML_SM_EFUSE_READ			U(0x82000030)
+#define AML_SM_EFUSE_USER_MAX			U(0x82000033)
+
+#define AML_SM_JTAG_ON				U(0x82000040)
+#define AML_SM_JTAG_OFF				U(0x82000041)
+#define AML_SM_GET_CHIP_ID			U(0x82000044)
+
+#define AML_JTAG_STATE_ON			U(0)
+#define AML_JTAG_STATE_OFF			U(1)
+
+#define AML_JTAG_M3_AO				U(0)
+#define AML_JTAG_M3_EE				U(1)
+#define AML_JTAG_A53_AO				U(2)
+#define AML_JTAG_A53_EE				U(3)
+
+#endif /* G12A_DEF_H */

plat/amlogic/g12a/g12a_pm.c

+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <common/debug.h>
+#include <drivers/arm/gicv2.h>
+#include <drivers/console.h>
+#include <errno.h>
+#include <lib/mmio.h>
+#include <lib/psci/psci.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+
+#include "aml_private.h"
+
+#define SCPI_POWER_ON		0
+#define SCPI_POWER_RETENTION	1
+#define SCPI_POWER_OFF		3
+
+#define SCPI_SYSTEM_SHUTDOWN	0
+#define SCPI_SYSTEM_REBOOT	1
+
+static uintptr_t g12a_sec_entrypoint;
+static volatile uint32_t g12a_cpu0_go;
+
+static void g12a_pm_set_reset_addr(u_register_t mpidr, uint64_t value)
+{
+	unsigned int core = plat_calc_core_pos(mpidr);
+	uintptr_t cpu_mailbox_addr = AML_PSCI_MAILBOX_BASE + (core << 4);
+
+	mmio_write_64(cpu_mailbox_addr, value);
+}
+
+static void g12a_pm_reset(u_register_t mpidr)
+{
+	unsigned int core = plat_calc_core_pos(mpidr);
+	uintptr_t cpu_mailbox_addr = AML_PSCI_MAILBOX_BASE + (core << 4) + 8;
+
+	mmio_write_32(cpu_mailbox_addr, 0);
+}
+
+static void __dead2 g12a_system_reset(void)
+{
+	INFO("BL31: PSCI_SYSTEM_RESET\n");
+
+	u_register_t mpidr = read_mpidr_el1();
+	uint32_t status = mmio_read_32(AML_AO_RTI_STATUS_REG3);
+	int ret;
+
+	NOTICE("BL31: Reboot reason: 0x%x\n", status);
+
+	status &= 0xFFFF0FF0;
+
+	console_flush();
+
+	mmio_write_32(AML_AO_RTI_STATUS_REG3, status);
+
+	ret = aml_scpi_sys_power_state(SCPI_SYSTEM_REBOOT);
+
+	if (ret != 0) {
+		ERROR("BL31: PSCI_SYSTEM_RESET: SCP error: %i\n", ret);
+		panic();
+	}
+
+	g12a_pm_reset(mpidr);
+
+	wfi();
+
+	ERROR("BL31: PSCI_SYSTEM_RESET: Operation not handled\n");
+	panic();
+}
+
+static void __dead2 g12a_system_off(void)
+{
+	INFO("BL31: PSCI_SYSTEM_OFF\n");
+
+	u_register_t mpidr = read_mpidr_el1();
+	int ret;
+
+	ret = aml_scpi_sys_power_state(SCPI_SYSTEM_SHUTDOWN);
+
+	if (ret != 0) {
+		ERROR("BL31: PSCI_SYSTEM_OFF: SCP error %i\n", ret);
+		panic();
+	}
+
+	g12a_pm_set_reset_addr(mpidr, 0);
+	g12a_pm_reset(mpidr);
+
+	wfi();
+
+	ERROR("BL31: PSCI_SYSTEM_OFF: Operation not handled\n");
+	panic();
+}
+
+static int32_t g12a_pwr_domain_on(u_register_t mpidr)
+{
+	unsigned int core = plat_calc_core_pos(mpidr);
+
+	/* CPU0 can't be turned OFF */
+	if (core == AML_PRIMARY_CPU) {
+		VERBOSE("BL31: Releasing CPU0 from wait loop...\n");
+
+		g12a_cpu0_go = 1;
+		flush_dcache_range((uintptr_t)&g12a_cpu0_go,
+				sizeof(g12a_cpu0_go));
+		dsb();
+		isb();
+
+		sev();
+
+		return PSCI_E_SUCCESS;
+	}
+
+	g12a_pm_set_reset_addr(mpidr, g12a_sec_entrypoint);
+	aml_scpi_set_css_power_state(mpidr,
+				     SCPI_POWER_ON, SCPI_POWER_ON, SCPI_POWER_ON);
+	dmbsy();
+	sev();
+
+	return PSCI_E_SUCCESS;
+}
+
+static void g12a_pwr_domain_on_finish(const psci_power_state_t *target_state)
+{
+	unsigned int core = plat_calc_core_pos(read_mpidr_el1());
+
+	assert(target_state->pwr_domain_state[MPIDR_AFFLVL0] ==
+					PLAT_LOCAL_STATE_OFF);
+
+	if (core == AML_PRIMARY_CPU) {
+		g12a_cpu0_go = 0;
+		flush_dcache_range((uintptr_t)&g12a_cpu0_go,
+				sizeof(g12a_cpu0_go));
+		dsb();
+		isb();
+	}
+
+	gicv2_pcpu_distif_init();
+	gicv2_cpuif_enable();
+}
+
+static void g12a_pwr_domain_off(const psci_power_state_t *target_state)
+{
+	u_register_t mpidr = read_mpidr_el1();
+	unsigned int core = plat_calc_core_pos(mpidr);
+
+	gicv2_cpuif_disable();
+
+	/* CPU0 can't be turned OFF */
+	if (core == AML_PRIMARY_CPU)
+		return;
+
+	aml_scpi_set_css_power_state(mpidr,
+				     SCPI_POWER_OFF, SCPI_POWER_ON,
+				     SCPI_POWER_ON);
+}
+
+static void __dead2 g12a_pwr_domain_pwr_down_wfi(const psci_power_state_t
+						 *target_state)
+{
+	u_register_t mpidr = read_mpidr_el1();
+	unsigned int core = plat_calc_core_pos(mpidr);
+
+	/* CPU0 can't be turned OFF, emulate it with a WFE loop */
+	if (core == AML_PRIMARY_CPU) {
+		VERBOSE("BL31: CPU0 entering wait loop...\n");
+
+		while (g12a_cpu0_go == 0)
+			wfe();
+
+		VERBOSE("BL31: CPU0 resumed.\n");
+
+		/*
+		 * Because setting CPU0's warm reset entrypoint through PSCI
+		 * mailbox and/or mmio mapped RVBAR (0xda834650) does not seem
+		 * to work, jump to it manually.
+		 * In order to avoid an assert, MMU has to be disabled.
+		 */
+		disable_mmu_el3();
+		((void(*)(void))g12a_sec_entrypoint)();
+	}
+
+	dsbsy();
+	g12a_pm_set_reset_addr(mpidr, 0);
+	g12a_pm_reset(mpidr);
+
+	for (;;)
+		wfi();
+}
+
+/*******************************************************************************
+ * Platform handlers and setup function.
+ ******************************************************************************/
+static const plat_psci_ops_t g12a_ops = {
+	.pwr_domain_on			= g12a_pwr_domain_on,
+	.pwr_domain_on_finish		= g12a_pwr_domain_on_finish,
+	.pwr_domain_off			= g12a_pwr_domain_off,
+	.pwr_domain_pwr_down_wfi	= g12a_pwr_domain_pwr_down_wfi,
+	.system_off			= g12a_system_off,
+	.system_reset			= g12a_system_reset
+};
+
+int plat_setup_psci_ops(uintptr_t sec_entrypoint,
+			const plat_psci_ops_t **psci_ops)
+{
+	g12a_sec_entrypoint = sec_entrypoint;
+	*psci_ops = &g12a_ops;
+	g12a_cpu0_go = 0;
+	return 0;
+}

plat/amlogic/g12a/include/platform_def.h

+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef PLATFORM_DEF_H
+#define PLATFORM_DEF_H
+
+#include <arch.h>
+#include <lib/utils_def.h>
+
+#include "../g12a_def.h"
+
+#define PLATFORM_LINKER_FORMAT		"elf64-littleaarch64"
+#define PLATFORM_LINKER_ARCH		aarch64
+
+#define PLATFORM_STACK_SIZE		UL(0x1000)
+
+#define PLATFORM_MAX_CPUS_PER_CLUSTER	U(4)
+#define PLATFORM_CLUSTER_COUNT		U(1)
+#define PLATFORM_CLUSTER0_CORE_COUNT	PLATFORM_MAX_CPUS_PER_CLUSTER
+#define PLATFORM_CORE_COUNT		PLATFORM_CLUSTER0_CORE_COUNT
+
+#define AML_PRIMARY_CPU			U(0)
+
+#define PLAT_MAX_PWR_LVL		MPIDR_AFFLVL1
+#define PLAT_NUM_PWR_DOMAINS		(PLATFORM_CLUSTER_COUNT + \
+					 PLATFORM_CORE_COUNT)
+
+#define PLAT_MAX_RET_STATE		U(1)
+#define PLAT_MAX_OFF_STATE		U(2)
+
+/* Local power state for power domains in Run state. */
+#define PLAT_LOCAL_STATE_RUN		U(0)
+/* Local power state for retention. Valid only for CPU power domains */
+#define PLAT_LOCAL_STATE_RET		U(1)
+/* Local power state for power-down. Valid for CPU and cluster power domains. */
+#define PLAT_LOCAL_STATE_OFF		U(2)
+
+/*
+ * Macros used to parse state information from State-ID if it is using the
+ * recommended encoding for State-ID.
+ */
+#define PLAT_LOCAL_PSTATE_WIDTH		U(4)
+#define PLAT_LOCAL_PSTATE_MASK		((U(1) << PLAT_LOCAL_PSTATE_WIDTH) - 1)
+
+/*
+ * Some data must be aligned on the biggest cache line size in the platform.
+ * This is known only to the platform as it might have a combination of
+ * integrated and external caches.
+ */
+#define CACHE_WRITEBACK_SHIFT		U(6)
+#define CACHE_WRITEBACK_GRANULE		(U(1) << CACHE_WRITEBACK_SHIFT)
+
+/* Memory-related defines */
+#define PLAT_PHY_ADDR_SPACE_SIZE	(ULL(1) << 32)
+#define PLAT_VIRT_ADDR_SPACE_SIZE	(ULL(1) << 32)
+
+#define MAX_MMAP_REGIONS		16
+#define MAX_XLAT_TABLES			8
+
+#endif /* PLATFORM_DEF_H */

plat/amlogic/g12a/platform.mk

+#
+# Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+include lib/xlat_tables_v2/xlat_tables.mk
+
+AML_PLAT		:=	plat/amlogic
+AML_PLAT_SOC		:=	${AML_PLAT}/${PLAT}
+AML_PLAT_COMMON		:=	${AML_PLAT}/common
+
+DOIMAGEPATH		?=	tools/amlogic
+DOIMAGETOOL		?=	${DOIMAGEPATH}/doimage
+
+PLAT_INCLUDES		:=	-Iinclude/drivers/amlogic/			\
+				-I${AML_PLAT_SOC}/include			\
+				-I${AML_PLAT_COMMON}/include
+
+GIC_SOURCES		:=	drivers/arm/gic/common/gic_common.c		\
+				drivers/arm/gic/v2/gicv2_main.c			\
+				drivers/arm/gic/v2/gicv2_helpers.c		\
+				plat/common/plat_gicv2.c
+
+BL31_SOURCES		+=	lib/cpus/aarch64/cortex_a53.S			\
+				plat/common/plat_psci_common.c			\
+				drivers/amlogic/console/aarch64/meson_console.S	\
+				${AML_PLAT_SOC}/${PLAT}_bl31_setup.c		\
+				${AML_PLAT_SOC}/${PLAT}_pm.c			\
+				${AML_PLAT_SOC}/${PLAT}_common.c		\
+				${AML_PLAT_COMMON}/aarch64/aml_helpers.S	\
+				${AML_PLAT_COMMON}/aml_efuse.c			\
+				${AML_PLAT_COMMON}/aml_mhu.c			\
+				${AML_PLAT_COMMON}/aml_scpi.c			\
+				${AML_PLAT_COMMON}/aml_sip_svc.c		\
+				${AML_PLAT_COMMON}/aml_thermal.c		\
+				${AML_PLAT_COMMON}/aml_topology.c		\
+				${AML_PLAT_COMMON}/aml_console.c		\
+				drivers/amlogic/crypto/sha_dma.c		\
+				${XLAT_TABLES_LIB_SRCS}				\
+				${GIC_SOURCES}
+
+# Tune compiler for Cortex-A53
+ifeq ($(notdir $(CC)),armclang)
+    TF_CFLAGS_aarch64	+=	-mcpu=cortex-a53
+else ifneq ($(findstring clang,$(notdir $(CC))),)
+    TF_CFLAGS_aarch64	+=	-mcpu=cortex-a53
+else
+    TF_CFLAGS_aarch64	+=	-mtune=cortex-a53
+endif
+
+# Build config flags
+# ------------------
+
+# Enable all errata workarounds for Cortex-A53
+ERRATA_A53_855873		:= 1
+ERRATA_A53_819472		:= 1
+ERRATA_A53_824069		:= 1
+ERRATA_A53_827319		:= 1
+
+WORKAROUND_CVE_2017_5715	:= 0
+
+# Have different sections for code and rodata
+SEPARATE_CODE_AND_RODATA	:= 1
+
+# Use Coherent memory
+USE_COHERENT_MEM		:= 1
+
+# Verify build config
+# -------------------
+
+ifneq (${RESET_TO_BL31}, 0)
+  $(error Error: ${PLAT} needs RESET_TO_BL31=0)
+endif
+
+ifeq (${ARCH},aarch32)
+  $(error Error: AArch32 not supported on ${PLAT})
+endif
+
+all: ${BUILD_PLAT}/bl31.img
+distclean realclean clean: cleanimage
+
+cleanimage:
+	${Q}${MAKE} -C ${DOIMAGEPATH} clean
+
+${DOIMAGETOOL}:
+	${Q}${MAKE} -C ${DOIMAGEPATH}
+
+${BUILD_PLAT}/bl31.img: ${BUILD_PLAT}/bl31.bin ${DOIMAGETOOL}
+	${DOIMAGETOOL} ${BUILD_PLAT}/bl31.bin ${BUILD_PLAT}/bl31.img
+