/*
 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
#include <arch_helpers.h>
#include <bl_common.h>
#include <console.h>
#include <debug.h>
#include <libfdt.h>
#include <platform_def.h>
#include "qemu_private.h"
#include <string.h>
#include <utils.h>

/*
 * The next 2 constants identify the extents of the code & RO data region.
 * These addresses are used by the MMU setup code and therefore they must be
 * page-aligned.  It is the responsibility of the linker script to ensure that
 * __RO_START__ and __RO_END__ linker symbols refer to page-aligned addresses.
 */
#define BL2_RO_BASE (unsigned long)(&__RO_START__)
#define BL2_RO_LIMIT (unsigned long)(&__RO_END__)

/*******************************************************************************
 * This structure represents the superset of information that is passed to
 * BL3-1, e.g. while passing control to it from BL2, bl31_params
 * and other platform specific params
 ******************************************************************************/
typedef struct bl2_to_bl31_params_mem {
	bl31_params_t bl31_params;
	image_info_t bl31_image_info;
	image_info_t bl32_image_info;
	image_info_t bl33_image_info;
	entry_point_info_t bl33_ep_info;
	entry_point_info_t bl32_ep_info;
	entry_point_info_t bl31_ep_info;
} bl2_to_bl31_params_mem_t;


static bl2_to_bl31_params_mem_t bl31_params_mem;



/* Data structure which holds the extents of the trusted SRAM for BL2 */
static meminfo_t bl2_tzram_layout __aligned(CACHE_WRITEBACK_GRANULE);

meminfo_t *bl2_plat_sec_mem_layout(void)
{
	return &bl2_tzram_layout;
}

/*******************************************************************************
 * This function assigns a pointer to the memory that the platform has kept
 * aside to pass platform specific and trusted firmware related information
 * to BL31. This memory is allocated by allocating memory to
 * bl2_to_bl31_params_mem_t structure which is a superset of all the
 * structure whose information is passed to BL31
 * NOTE: This function should be called only once and should be done
 * before generating params to BL31
 ******************************************************************************/
bl31_params_t *bl2_plat_get_bl31_params(void)
{
	bl31_params_t *bl2_to_bl31_params;

	/*
	 * Initialise the memory for all the arguments that needs to
	 * be passed to BL3-1
	 */
	zeromem(&bl31_params_mem, sizeof(bl2_to_bl31_params_mem_t));

	/* Assign memory for TF related information */
	bl2_to_bl31_params = &bl31_params_mem.bl31_params;
	SET_PARAM_HEAD(bl2_to_bl31_params, PARAM_BL31, VERSION_1, 0);

	/* Fill BL3-1 related information */
	bl2_to_bl31_params->bl31_image_info = &bl31_params_mem.bl31_image_info;
	SET_PARAM_HEAD(bl2_to_bl31_params->bl31_image_info, PARAM_IMAGE_BINARY,
		VERSION_1, 0);

	/* Fill BL3-2 related information */
	bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info;
	SET_PARAM_HEAD(bl2_to_bl31_params->bl32_ep_info, PARAM_EP,
		VERSION_1, 0);
	bl2_to_bl31_params->bl32_image_info = &bl31_params_mem.bl32_image_info;
	SET_PARAM_HEAD(bl2_to_bl31_params->bl32_image_info, PARAM_IMAGE_BINARY,
		VERSION_1, 0);

	/* Fill BL3-3 related information */
	bl2_to_bl31_params->bl33_ep_info = &bl31_params_mem.bl33_ep_info;
	SET_PARAM_HEAD(bl2_to_bl31_params->bl33_ep_info,
		PARAM_EP, VERSION_1, 0);

	/* BL3-3 expects to receive the primary CPU MPID (through x0) */
	bl2_to_bl31_params->bl33_ep_info->args.arg0 = 0xffff & read_mpidr();

	bl2_to_bl31_params->bl33_image_info = &bl31_params_mem.bl33_image_info;
	SET_PARAM_HEAD(bl2_to_bl31_params->bl33_image_info, PARAM_IMAGE_BINARY,
		VERSION_1, 0);

	return bl2_to_bl31_params;
}

/* Flush the TF params and the TF plat params */
void bl2_plat_flush_bl31_params(void)
{
	flush_dcache_range((unsigned long)&bl31_params_mem,
			sizeof(bl2_to_bl31_params_mem_t));
}

/*******************************************************************************
 * This function returns a pointer to the shared memory that the platform
 * has kept to point to entry point information of BL31 to BL2
 ******************************************************************************/
struct entry_point_info *bl2_plat_get_bl31_ep_info(void)
{
#if DEBUG
	bl31_params_mem.bl31_ep_info.args.arg1 = QEMU_BL31_PLAT_PARAM_VAL;
#endif

	return &bl31_params_mem.bl31_ep_info;
}



void bl2_early_platform_setup(meminfo_t *mem_layout)
{
	/* Initialize the console to provide early debug support */
	console_init(PLAT_QEMU_BOOT_UART_BASE, PLAT_QEMU_BOOT_UART_CLK_IN_HZ,
			PLAT_QEMU_CONSOLE_BAUDRATE);

	/* Setup the BL2 memory layout */
	bl2_tzram_layout = *mem_layout;

	plat_qemu_io_setup();
}

static void security_setup(void)
{
	/*
	 * This is where a TrustZone address space controller and other
	 * security related peripherals, would be configured.
	 */
}

static void update_dt(void)
{
	int ret;
	void *fdt = (void *)(uintptr_t)PLAT_QEMU_DT_BASE;

	ret = fdt_open_into(fdt, fdt, PLAT_QEMU_DT_MAX_SIZE);
	if (ret < 0) {
		ERROR("Invalid Device Tree at %p: error %d\n", fdt, ret);
		return;
	}

	if (dt_add_psci_node(fdt)) {
		ERROR("Failed to add PSCI Device Tree node\n");
		return;
	}

	if (dt_add_psci_cpu_enable_methods(fdt)) {
		ERROR("Failed to add PSCI cpu enable methods in Device Tree\n");
		return;
	}

	ret = fdt_pack(fdt);
	if (ret < 0)
		ERROR("Failed to pack Device Tree at %p: error %d\n", fdt, ret);
}

void bl2_platform_setup(void)
{
	security_setup();
	update_dt();

	/* TODO Initialize timer */
}

void bl2_plat_arch_setup(void)
{
	qemu_configure_mmu_el1(bl2_tzram_layout.total_base,
			      bl2_tzram_layout.total_size,
			      BL2_RO_BASE, BL2_RO_LIMIT,
			      BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_END);
}

/*******************************************************************************
 * Gets SPSR for BL32 entry
 ******************************************************************************/
static uint32_t qemu_get_spsr_for_bl32_entry(void)
{
	/*
	 * The Secure Payload Dispatcher service is responsible for
	 * setting the SPSR prior to entry into the BL3-2 image.
	 */
	return 0;
}

/*******************************************************************************
 * Gets SPSR for BL33 entry
 ******************************************************************************/
static uint32_t qemu_get_spsr_for_bl33_entry(void)
{
	unsigned long el_status;
	unsigned int mode;
	uint32_t spsr;

	/* Figure out what mode we enter the non-secure world in */
	el_status = read_id_aa64pfr0_el1() >> ID_AA64PFR0_EL2_SHIFT;
	el_status &= ID_AA64PFR0_ELX_MASK;

	mode = (el_status) ? MODE_EL2 : MODE_EL1;

	/*
	 * TODO: Consider the possibility of specifying the SPSR in
	 * the FIP ToC and allowing the platform to have a say as
	 * well.
	 */
	spsr = SPSR_64(mode, MODE_SP_ELX, DISABLE_ALL_EXCEPTIONS);
	return spsr;
}

/*******************************************************************************
 * Before calling this function BL3-1 is loaded in memory and its entrypoint
 * is set by load_image. This is a placeholder for the platform to change
 * the entrypoint of BL3-1 and set SPSR and security state.
 * On ARM standard platforms we only set the security state of the entrypoint
 ******************************************************************************/
void bl2_plat_set_bl31_ep_info(image_info_t *bl31_image_info,
					entry_point_info_t *bl31_ep_info)
{
	SET_SECURITY_STATE(bl31_ep_info->h.attr, SECURE);
	bl31_ep_info->spsr = SPSR_64(MODE_EL3, MODE_SP_ELX,
					DISABLE_ALL_EXCEPTIONS);
}

/*******************************************************************************
 * Before calling this function BL3-2 is loaded in memory and its entrypoint
 * is set by load_image. This is a placeholder for the platform to change
 * the entrypoint of BL3-2 and set SPSR and security state.
 * On ARM standard platforms we only set the security state of the entrypoint
 ******************************************************************************/
void bl2_plat_set_bl32_ep_info(image_info_t *bl32_image_info,
					entry_point_info_t *bl32_ep_info)
{
	SET_SECURITY_STATE(bl32_ep_info->h.attr, SECURE);
	bl32_ep_info->spsr = qemu_get_spsr_for_bl32_entry();
}

/*******************************************************************************
 * Before calling this function BL3-3 is loaded in memory and its entrypoint
 * is set by load_image. This is a placeholder for the platform to change
 * the entrypoint of BL3-3 and set SPSR and security state.
 * On ARM standard platforms we only set the security state of the entrypoint
 ******************************************************************************/
void bl2_plat_set_bl33_ep_info(image_info_t *image,
					entry_point_info_t *bl33_ep_info)
{

	SET_SECURITY_STATE(bl33_ep_info->h.attr, NON_SECURE);
	bl33_ep_info->spsr = qemu_get_spsr_for_bl33_entry();
}

/*******************************************************************************
 * Populate the extents of memory available for loading BL32
 ******************************************************************************/
void bl2_plat_get_bl32_meminfo(meminfo_t *bl32_meminfo)
{
	/*
	 * Populate the extents of memory available for loading BL32.
	 */
	bl32_meminfo->total_base = BL32_BASE;
	bl32_meminfo->free_base = BL32_BASE;
	bl32_meminfo->total_size = (BL32_MEM_BASE + BL32_MEM_SIZE) - BL32_BASE;
	bl32_meminfo->free_size = (BL32_MEM_BASE + BL32_MEM_SIZE) - BL32_BASE;
}

/*******************************************************************************
 * Populate the extents of memory available for loading BL33
 ******************************************************************************/
void bl2_plat_get_bl33_meminfo(meminfo_t *bl33_meminfo)
{
	bl33_meminfo->total_base = NS_DRAM0_BASE;
	bl33_meminfo->total_size = NS_DRAM0_SIZE;
	bl33_meminfo->free_base = NS_DRAM0_BASE;
	bl33_meminfo->free_size = NS_DRAM0_SIZE;
}

unsigned long plat_get_ns_image_entrypoint(void)
{
	return NS_IMAGE_OFFSET;
}