/*
    ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

#include "ch.h"
#include "hal.h"

/* Time and source of tamper */
typedef struct {
  uint8_t mode;              /* tamper occurs in normal or backup mode */
  RTCDateTime tamper_time;
  uint32_t     source;        /* tamper source */
} tamper_detail;

/* informations of tamper */
typedef struct {
  bool jtag_sel_ca5;          /* JTAGSEL, CA5 Tap response or CA5 debug ACK detected */
  bool jtag_tck_tms;          /* JTAG TCK/TMS activity detected */

  /* tamper counter */
  uint32_t tampers;

  /* total number of tampers occured */
  uint32_t total_tampers;

  /* detail information of first and last tamper */
  tamper_detail details[2];
} tamper_info;

static tamper_info t_info;

RTCDateTime cfg_time = {
  38,
  4,
  0,
  1,
  9,
  66840000
};

void updateTamperStruct(tamper_info *info, secevent_t event) {

  /*Clear the tamper_info bits before checking the tamper type*/
  info->jtag_sel_ca5 = FALSE;
  info->jtag_tck_tms = FALSE;
  info->total_tampers = 0;

  /* Read auxiliary status if needed */
  if (event == SEC_EVENT_JTAG) {
    uint32_t jtag = SECUMOD->SECUMOD_ASR;
    info->jtag_sel_ca5 = ((jtag & SECUMOD_ASR_JTAG) != 0);
    info->jtag_tck_tms = ((jtag & SECUMOD_ASR_TCK) != 0);
  }

  /* Read tamper counter */
  info->tampers = rtcGetTamperEventCounter(&RTCD0);
  /* Update the total counter */
  info->total_tampers += 1;

  /* Read tamper information */
  uint8_t index = (info->total_tampers != 0 ) ? 2 : 1;
  while (index) {
    index--;
    tamper_detail *detail = &(info->details[index]);
    rtcGetTamperTime(&RTCD0, index, &detail->tamper_time);
    detail->source = rtcGetTamperSource(&RTCD0, index);
    detail->mode = rtcGetTamperMode(&RTCD0, index);
  }
}

/* PIOBU pin attribute */
static PIOBUConfig piocfg[] = {
  {
    .pinIndex = 0, /* PIOBU0 */
    .afv = 5,
    .rfv = 5,
    .mode = 1,
    .outputLevel = 0,
    .pullUpState = 0,
    .scheduled  = 0,
    .inputDefaultLevel = 0,
    .dynamic = 1,
    .filter3_5 = 0,
  },
  {
    .pinIndex = 1, /* PIOBU1 */
    .afv = 5,
    .rfv = 5,
    .mode = 0,
    .outputLevel = 0,
    .pullUpState = 0,
    .scheduled = 0,
    .inputDefaultLevel = 0,
    .dynamic = 1,
    .filter3_5 = 0,
  },
  {
    .pinIndex = 3, /* PIOBU3 */
    .afv = 6,
    .rfv = 6,
    .mode = 0,
    .outputLevel = 0,
    .pullUpState = 1,
    .scheduled = 0,
    .inputDefaultLevel = 1,
    .dynamic = 0,
    .filter3_5 = 0,
  },
  {
    .pinIndex = 4, /* PIOBU4 */
    .afv = 5,
    .rfv = 5,
    .mode = 1,
    .outputLevel = 0,
    .pullUpState = 0,
    .scheduled  = 0,
    .inputDefaultLevel = 0,
    .dynamic = 1,
    .filter3_5 = 0,
  },
  {
    .pinIndex = 5, /* PIOBU5 */
    .afv = 5,
    .rfv = 5,
    .mode = 0,
    .outputLevel = 0,
    .pullUpState = 0,
    .scheduled = 0,
    .inputDefaultLevel = 0,
    .dynamic = 1,
    .filter3_5 = 0,
  },
  {
    .pinIndex = 7, /* PIOBU7 */
    .afv = 8,
    .rfv = 8,
    .mode = 0,
    .outputLevel = 0,
    .pullUpState = 2,
    .scheduled = 0,
    .inputDefaultLevel = 0,
    .dynamic = 0,
    .filter3_5 = 0,
  },
};

static void secram_callback(SECDriver *secp) {
  (void)secp;
  palClearLine(LINE_LED_RED);
}

static void erase_callback(SECDriver *secp) {
  (void)secp;
  palClearLine(LINE_LED_GREEN);
}

static void secmod_callback(SECDriver *secp, secevent_t event) {
  (void)secp;
  chSysLockFromISR();
  switch (event) {
  case (SEC_EVENT_PIOBU0):
    secumodSoftwareProtection();
    break;
  case (SEC_EVENT_PIOBU1):
    secumodSoftwareProtection();
    break;
  case (SEC_EVENT_PIOBU2):
    secumodSoftwareProtection();
    break;
  case (SEC_EVENT_PIOBU3):
    secumodSoftwareProtection();
    break;
  case (SEC_EVENT_PIOBU4):
    secumodSoftwareProtection();
    break;
  case (SEC_EVENT_PIOBU5):
    secumodSoftwareProtection();
    break;
  case (SEC_EVENT_PIOBU6):
    secumodSoftwareProtection();
    break;
  case (SEC_EVENT_PIOBU7):
    secumodSoftwareProtection();
    break;
  case SEC_EVENT_SHLDM:
    ;
    break;
  case SEC_EVENT_DBLFM:
    ;
    break;
  case SEC_EVENT_TST:
    ;
    break;
  case SEC_EVENT_JTAG:
    ;
    break;
  case SEC_EVENT_MCKM:
    ;
    break;
  case SEC_EVENT_TPML:
    ;
    break;
  case SEC_EVENT_TPMH:
    ;
    break;
  case SEC_EVENT_VDDBUL:
    ;
    break;
  case SEC_EVENT_VDDBUH:
    ;
    break;
  case SEC_EVENT_VDDCOREL:
    ;
    break;
  case SEC_EVENT_VDDCOREH:
    ;
    break;
  }

  /* Storing tamper information */
  updateTamperStruct(&t_info, event);
  chSysUnlockFromISR();
}

static SECConfig secumod_cfg = {
  secram_callback,                          /* securam callback        */
  erase_callback,                           /* erased callback         */
  6,                                        /* Pads to configure       */
  piocfg,                                   /* PIOBU config            */
  {
    {RAMACC_RD_ACCESS},                     /* RAM region 0 permission */
    {RAMACC_WR_RD_ACCESS},                  /* RAM region 1 permission */
    {RAMACC_WR_RD_ACCESS},                  /* RAM region 2 permission */
    {RAMACC_WR_RD_ACCESS},                  /* RAM region 3 permission */
    {RAMACC_WR_RD_ACCESS},                  /* RAM region 4 permission */
    {RAMACC_WR_RD_ACCESS}                   /* RAM region 5 permission */
  },
  SECUMOD_CR_NORMAL |                       /* CR register             */
  SECUMOD_CR_SCRAMB(SCRAMB_DISABLE),
  SECUMOD_JTAGCR_CA5_DEBUG_MODE_FULL_DEBUG  /* JTAGCR register         */
};

/*
 * LED blinker thread, times are in milliseconds.
 */
static THD_WORKING_AREA(waThread1, 512);
static THD_FUNCTION(Thread1, arg) {

  (void)arg;
  chRegSetThreadName("blinker");

  while (true) {
    palToggleLine(LINE_LED_BLUE);
    chThdSleepMilliseconds(80);
    palToggleLine(LINE_LED_BLUE);
    chThdSleepMilliseconds(120);
    palToggleLine(LINE_LED_BLUE);
    chThdSleepMilliseconds(120);
    palToggleLine(LINE_LED_BLUE);
    chThdSleepMilliseconds(120);
    palToggleLine(LINE_LED_BLUE);
    chThdSleepMilliseconds(160);
    palToggleLine(LINE_LED_BLUE);
    chThdSleepMilliseconds(600);
  }
}

/*
 * Application entry point.
 */
int main(void) {

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();
  secInit();

  /*
   * Configures date
   */
  rtcSetTime(&RTCD0, &cfg_time);

  /* REGION_0 location */
  uint32_t *region0 = (uint32_t *) 0xF8044000;

  /*
   * Starts SECUMOD Driver
   */
  secStart(&SECD0, &secumod_cfg);

  /*
   * Creates the blinker thread.
   */
  chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);

  /* Intrusion on PIOBU pad 0 causes interrupt but not automating erase */
  secSetCallback(&SECD0, SECUMOD_DET0, &secmod_callback);

  /*
   * Normal main() thread activity, in this demo it does nothing except
   * sleeping in a loop and check the button state.
   */
  while (true) {
    if(!palReadPad(PIOB, PIOB_USER_PB)) {
      /* Write access in REGION_0 causes SECURAM interrupt */
      *region0 = 0xAA55AA55;
    }
    chThdSleepMilliseconds(500);
  }
}