/*
 * Copyright (c) 2015-2023, NVIDIA CORPORATION.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of NVIDIA CORPORATION nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* Compiler headers */
#include <stdint.h>                     // for uint64_t
#include <stdbool.h>                    // for bool

/* Early FSP headers */
#include <misc/ct-assert.h>             // for CT_ASSERT

/* Hardware headers */

/* Late FSP headers */
#include <osa/rtos-task.h>              // for rtosTaskIsSchedulerStarted
#include <cpu/barriers.h>               // for barrier_compiler, FSP__ARM__COMMON_...
#include <delay/delay.h>                // for FSP__DELAY__DELAY_H, get_time_delta_us
#include <irq/safe-irqs.h>              // for in_critical, in_interrupt
#include <misc/macros.h>                // for START_RFD_BLOCK, END_RFD_BLOCK, INLINE_RFD

/* Module-specific FSP headers */
#include <tke/tke-tegra.h>              // for tegra_tke_get_elapsed_usecs64, tegr...

/*
 * Compile-time check for FSP header files
 *   Each FSP header file contains a signature unique to that file, and the
 *   FSP project.  The CT_ASSERT macro (contained in misc/ct-assert.h) can
 *   check for this signature.  If it does not exist, then the build will
 *   abort.
 *
 *   This is a trap for projects which have their own include files of the
 *   same names, but different contents.  This trap ensures that only the
 *   files from the FSP project, are built into the FSP source code.
 */
START_RFD_BLOCK(MISRA, DEVIATE, Rule_1_2, "Approval: Bug 200531996, DR: SWE-FSP-009-SWSADR.docx",
                MISRA, DEVIATE, Rule_2_3, "Approval:  On-file, DR: SWE-FSP-010-SWSADR.docx",
                MISRA, DEVIATE, Directive_4_9, "Approval: Bug 200531995, DR: SWE-FSP-012-SWSADR.docx")
CT_ASSERT(FSP__OSA__RTOS_TASK_H, "Header file missing or invalid.")
CT_ASSERT(FSP__CPU__BARRIERS_H, "Header file missing or invalid.")
CT_ASSERT(FSP__DELAY__DELAY_H, "Header file missing or invalid.")
CT_ASSERT(FSP__IRQ__SAFE_IRQS_H, "Header file missing or invalid.")
CT_ASSERT(FSP__MISC__MACROS_H, "Header file missing or invalid.")
CT_ASSERT(FSP__TKE__TKE_TEGRA_H, "Header file missing or invalid.")
END_RFD_BLOCK(MISRA, DEVIATE, Rule_2_3, "Approval:  On-file, DR: SWE-FSP-010-SWSADR.docx")

START_RFD_BLOCK(MISRA, DEVIATE, Rule_8_7, "Approval: Bug 200531999, DR: SWE-FSP-015-SWSADR.docx")
void udelay(uint64_t delay_us)
{
        bool cant_yield;
        uint64_t start = tegra_tke_get_tsc64();

        cant_yield = in_interrupt();
        if (!cant_yield) {
                /* xTaskGetSchedulerState can't be called from an ISR */
                cant_yield = (!rtosTaskIsSchedulerStarted()) || in_critical();
        }

        INLINE_RFD(CERTC, DEVIATE, INT30_C, "Approval: JIRA TID-449, DR: SWE-FSP-045-SWSADR.docx");
        while ((tegra_tke_get_elapsed_usecs64(start)) <= delay_us) {
                if (cant_yield) {
                        barrier_compiler();
                } else {
                        rtosTaskYield();
                }
        }
}

uint64_t get_time_ticks(void)
{
        return tegra_tke_get_elapsed_usecs64(0ULL);
}

uint64_t get_time_delta_us(uint64_t ticks_start)
{
        return tegra_tke_get_elapsed_usecs64(ticks_start);
}
END_RFD_BLOCK(MISRA, DEVIATE, Rule_8_7, "Approval: Bug 200531999, DR: SWE-FSP-015-SWSADR.docx",
              MISRA, DEVIATE, Rule_1_2, "Approval: Bug 200531996, DR: SWE-FSP-009-SWSADR.docx",
              MISRA, DEVIATE, Directive_4_9, "Approval: Bug 200531995, DR: SWE-FSP-012-SWSADR.docx")
