/*
 * Copyright (c) 2018-2020, Arm Limited and Contributors. All rights reserved.
 * Copyright (c) 2018-2022, Xilinx, Inc. All rights reserved.
 * Copyright (c) 2022-2023, Advanced Micro Devices, Inc. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <errno.h>

#include <bl31/bl31.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <lib/mmio.h>
#include <lib/xlat_tables/xlat_tables_v2.h>
#include <plat/common/platform.h>
#include <plat_arm.h>
#include <plat_console.h>
#include <plat_clkfunc.h>

#include <plat_fdt.h>
#include <plat_private.h>
#include <plat_startup.h>
#include <pm_api_sys.h>
#include <pm_client.h>
#include <pm_ipi.h>
#include <versal_net_def.h>

static entry_point_info_t bl32_image_ep_info;
static entry_point_info_t bl33_image_ep_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)
{
	assert(sec_state_is_valid(type));

	if (type == NON_SECURE) {
		return &bl33_image_ep_info;
	}

	return &bl32_image_ep_info;
}

/*
 * Set the build time defaults,if we can't find any config data.
 */
static inline void bl31_set_default_config(void)
{
	bl32_image_ep_info.pc = BL32_BASE;
	bl32_image_ep_info.spsr = arm_get_spsr_for_bl32_entry();
	bl33_image_ep_info.pc = plat_get_ns_image_entrypoint();
	bl33_image_ep_info.spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
					DISABLE_ALL_EXCEPTIONS);
}

/*
 * Perform any BL31 specific platform actions. 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.
 */
void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
				u_register_t arg2, u_register_t arg3)
{
#if !(TFA_NO_PM)
	uint64_t tfa_handoff_addr, buff[HANDOFF_PARAMS_MAX_SIZE] = {0};
	uint32_t payload[PAYLOAD_ARG_CNT], max_size = HANDOFF_PARAMS_MAX_SIZE;
	enum pm_ret_status ret_status;
#endif /* !(TFA_NO_PM) */

	board_detection();

	switch (platform_id) {
	case VERSAL_NET_SPP:
		cpu_clock = 1000000;
		break;
	case VERSAL_NET_EMU:
		cpu_clock = 3660000;
		break;
	case VERSAL_NET_QEMU:
		/* Random values now */
		cpu_clock = 100000000;
		break;
	case VERSAL_NET_SILICON:
		cpu_clock = 100000000;
		break;
	default:
		panic();
	}

	syscnt_freq_config_setup();

	set_cnt_freq();

	setup_console();

	NOTICE("TF-A running on %s %d.%d\n", board_name_decode(),
	       platform_version / 10U, platform_version % 10U);

	/* Initialize the platform config for future decision making */
	versal_net_config_setup();

	/*
	 * Do initial security configuration to allow DRAM/device access. On
	 * Base VERSAL_NET only DRAM security is programmable (via TrustZone), but
	 * other platforms might have more programmable security devices
	 * present.
	 */

	/* Populate common information for BL32 and BL33 */
	SET_PARAM_HEAD(&bl32_image_ep_info, PARAM_EP, VERSION_1, 0);
	SET_SECURITY_STATE(bl32_image_ep_info.h.attr, SECURE);
	SET_PARAM_HEAD(&bl33_image_ep_info, PARAM_EP, VERSION_1, 0);
	SET_SECURITY_STATE(bl33_image_ep_info.h.attr, NON_SECURE);
#if !(TFA_NO_PM)
	PM_PACK_PAYLOAD4(payload, LOADER_MODULE_ID, 1, PM_LOAD_GET_HANDOFF_PARAMS,
			 (uintptr_t)buff >> 32U, (uintptr_t)buff, max_size);

	ret_status = pm_ipi_send_sync(primary_proc, payload, NULL, 0);
	if (ret_status == PM_RET_SUCCESS) {
		enum xbl_handoff xbl_ret;

		tfa_handoff_addr = (uintptr_t)&buff;

		xbl_ret = xbl_handover(&bl32_image_ep_info, &bl33_image_ep_info,
				       tfa_handoff_addr);
		if (xbl_ret != XBL_HANDOFF_SUCCESS) {
			ERROR("BL31: PLM to TF-A handover failed %u\n", xbl_ret);
			panic();
		}

		INFO("BL31: PLM to TF-A handover success\n");

		/*
		 * The BL32 load address is indicated as 0x0 in the handoff
		 * parameters, which is different from the default/user-provided
		 * load address of 0x60000000 but the flags are correctly
		 * configured. Consequently, in this scenario, set the PC
		 * to the requested BL32_BASE address.
		 */

		/* TODO: Remove the following check once this is fixed from PLM */
		if (bl32_image_ep_info.pc == 0 && bl32_image_ep_info.spsr != 0) {
			bl32_image_ep_info.pc = (uintptr_t)BL32_BASE;
		}
	} else {
		INFO("BL31: setting up default configs\n");

		bl31_set_default_config();
	}
#else
	bl31_set_default_config();
#endif /* !(TFA_NO_PM) */

	NOTICE("BL31: Secure code at 0x%lx\n", bl32_image_ep_info.pc);
	NOTICE("BL31: Non secure code at 0x%lx\n", bl33_image_ep_info.pc);
}

static versal_intr_info_type_el3_t type_el3_interrupt_table[MAX_INTR_EL3];

int request_intr_type_el3(uint32_t id, interrupt_type_handler_t handler)
{
	static uint32_t index;
	uint32_t i;

	/* Validate 'handler' and 'id' parameters */
	if (handler == NULL || index >= MAX_INTR_EL3) {
		return -EINVAL;
	}

	/* Check if a handler has already been registered */
	for (i = 0; i < index; i++) {
		if (id == type_el3_interrupt_table[i].id) {
			return -EALREADY;
		}
	}

	type_el3_interrupt_table[index].id = id;
	type_el3_interrupt_table[index].handler = handler;

	index++;

	return 0;
}

static uint64_t rdo_el3_interrupt_handler(uint32_t id, uint32_t flags,
					  void *handle, void *cookie)
{
	uint32_t intr_id;
	uint32_t i;
	interrupt_type_handler_t handler = NULL;

	intr_id = plat_ic_get_pending_interrupt_id();

	for (i = 0; i < MAX_INTR_EL3; i++) {
		if (intr_id == type_el3_interrupt_table[i].id) {
			handler = type_el3_interrupt_table[i].handler;
		}
	}

	if (handler != NULL) {
		handler(intr_id, flags, handle, cookie);
	}

	return 0;
}

void bl31_platform_setup(void)
{
	prepare_dtb();

	/* Initialize the gic cpu and distributor interfaces */
	plat_arm_gic_driver_init();
	plat_arm_gic_init();
}

void bl31_plat_runtime_setup(void)
{
	uint64_t flags = 0;
	int32_t rc;

	set_interrupt_rm_flag(flags, NON_SECURE);
	rc = register_interrupt_type_handler(INTR_TYPE_EL3,
					     rdo_el3_interrupt_handler, flags);
	if (rc != 0) {
		panic();
	}

	console_switch_state(CONSOLE_FLAG_RUNTIME);
}

/*
 * Perform the very early platform specific architectural setup here.
 */
void bl31_plat_arch_setup(void)
{
	const mmap_region_t bl_regions[] = {
#if (defined(XILINX_OF_BOARD_DTB_ADDR) && !IS_TFA_IN_OCM(BL31_BASE))
		MAP_REGION_FLAT(XILINX_OF_BOARD_DTB_ADDR, XILINX_OF_BOARD_DTB_MAX_SIZE,
				MT_MEMORY | MT_RW | MT_NS),
#endif
		MAP_REGION_FLAT(BL31_BASE, BL31_END - BL31_BASE,
			MT_MEMORY | MT_RW | MT_SECURE),
		MAP_REGION_FLAT(BL_CODE_BASE, BL_CODE_END - BL_CODE_BASE,
				MT_CODE | MT_SECURE),
		MAP_REGION_FLAT(BL_RO_DATA_BASE, BL_RO_DATA_END - BL_RO_DATA_BASE,
				MT_RO_DATA | MT_SECURE),
		{0}
	};

	setup_page_tables(bl_regions, plat_get_mmap());
	enable_mmu(0);
}