/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019
 *    William D. Jones (thor0505@comcast.net),
 *    Ha Thach (tinyusb.org)
 *    Uwe Bonnes (bon@elektron.ikp.physik.tu-darmstadt.de
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * This file is part of the TinyUSB stack.
 */

/* metadata:
   manufacturer: STMicroelectronics
*/

#include "stm32h7xx_hal.h"
#include "bsp/board_api.h"

TU_ATTR_UNUSED static void Error_Handler(void) { }

typedef struct {
  GPIO_TypeDef* port;
  GPIO_InitTypeDef pin_init;
  uint8_t active_state;
} board_pindef_t;

#include "board.h"

#ifdef UART_ID
  #if UART_ID == 1
    #define USARTn            USART1
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART1_CLK_ENABLE
  #elif UART_ID == 2
    #define USARTn            USART2
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART2_CLK_ENABLE
  #elif UART_ID == 3
    #define USARTn            USART3
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART3_CLK_ENABLE
  #elif UART_ID == 6
    #define USARTn            USART6
    #define UARTn_CLK_ENABLE  __HAL_RCC_USART6_CLK_ENABLE
  #endif
#endif

//--------------------------------------------------------------------+
// MACRO TYPEDEF CONSTANT ENUM
//--------------------------------------------------------------------+

#ifdef UART_ID
static UART_HandleTypeDef UartHandle = {
  .Instance = USARTn,
  .Init = {
    .BaudRate = CFG_BOARD_UART_BAUDRATE,
    .WordLength = UART_WORDLENGTH_8B,
    .StopBits = UART_STOPBITS_1,
    .Parity = UART_PARITY_NONE,
    .HwFlowCtl = UART_HWCONTROL_NONE,
    .Mode = UART_MODE_TX_RX,
    .OverSampling = UART_OVERSAMPLING_16,
  }
};
#endif

//--------------------------------------------------------------------+
// Forward USB interrupt events to TinyUSB IRQ Handler
//--------------------------------------------------------------------+

// Despite being call USB2_OTG_FS on some MCUs
// OTG_FS is marked as RHPort0 by TinyUSB to be consistent across stm32 port
void OTG_FS_IRQHandler(void) {
  tusb_int_handler(0, true);
}

// Despite being call USB1_OTG_HS on some MCUs
// OTG_HS is marked as RHPort1 by TinyUSB to be consistent across stm32 port
void OTG_HS_IRQHandler(void) {
  tusb_int_handler(1, true);
}

#ifdef TRACE_ETM
static void trace_etm_init(void) {
  // H7 trace pin is PE2 to PE6
  GPIO_InitTypeDef  gpio_init;
  gpio_init.Pin       = GPIO_PIN_2 | GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6;
  gpio_init.Mode      = GPIO_MODE_AF_PP;
  gpio_init.Pull      = GPIO_PULLUP;
  gpio_init.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
  gpio_init.Alternate = GPIO_AF0_TRACE;
  HAL_GPIO_Init(GPIOE, &gpio_init);

  // Enable trace clk, also in D1 and D3 domain
  DBGMCU->CR |= DBGMCU_CR_DBG_TRACECKEN | DBGMCU_CR_DBG_CKD1EN | DBGMCU_CR_DBG_CKD3EN;
}
#else
#define trace_etm_init()
#endif

void board_init(void) {
  SCB_EnableICache();

  HAL_Init();

  // Implemented in board.h
  SystemClock_Config();

  // Enable All GPIOs clocks
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOE_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();
#ifdef __HAL_RCC_GPIOI_CLK_ENABLE
  __HAL_RCC_GPIOI_CLK_ENABLE();
#endif
  __HAL_RCC_GPIOJ_CLK_ENABLE();

  trace_etm_init();

  for (uint8_t i = 0; i < TU_ARRAY_SIZE(board_pindef); i++) {
    HAL_GPIO_Init(board_pindef[i].port, &board_pindef[i].pin_init);
  }

#if CFG_TUSB_OS == OPT_OS_NONE
  // 1ms tick timer
  SysTick_Config(SystemCoreClock / 1000u);

#elif CFG_TUSB_OS == OPT_OS_FREERTOS
  // Explicitly disable systick to prevent its ISR from running before scheduler start
  SysTick->CTRL &= ~1UL;

  // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
  #ifdef USB_OTG_FS_PERIPH_BASE
  NVIC_SetPriority(OTG_FS_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
  #endif

  NVIC_SetPriority(OTG_HS_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );

#elif CFG_TUSB_OS == OPT_OS_THREADX
  // Disable SysTick before kernel entry; _tx_initialize_low_level() will re-configure it
  SysTick->CTRL &= ~1UL;
#endif

  GPIO_InitTypeDef GPIO_InitStruct;

#ifdef UART_ID
  UARTn_CLK_ENABLE();
  HAL_UART_Init(&UartHandle);
  HAL_UARTEx_EnableFifoMode(&UartHandle);
#endif

  //------------- USB FS -------------//
  // Despite being call USB2_OTG
  // OTG_FS is marked as RHPort0 by TinyUSB to be consistent across stm32 port
  // PA9 VUSB, PA10 ID, PA11 DM, PA12 DP

  // Configure DM DP Pins
  GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG2_HS;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  // This for ID line debug
  GPIO_InitStruct.Pin = GPIO_PIN_10;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG2_HS;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  // https://community.st.com/s/question/0D50X00009XkYZLSA3/stm32h7-nucleo-usb-fs-cdc
  // TODO: Board init actually works fine without this line.
  HAL_PWREx_EnableUSBVoltageDetector();
  __HAL_RCC_USB2_OTG_FS_CLK_ENABLE();

#if OTG_FS_VBUS_SENSE
  // Configure VBUS Pin
  GPIO_InitStruct.Pin = GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
#endif // vbus sense

#if CFG_TUD_ENABLED && BOARD_TUD_RHPORT == 0
  tud_configure_dwc2_t cfg = CFG_TUD_CONFIGURE_DWC2_DEFAULT;
  cfg.vbus_sensing = OTG_FS_VBUS_SENSE;
  tud_configure(0, TUD_CFGID_DWC2, &cfg);
#endif

  //------------- USB HS -------------//
#if (CFG_TUD_ENABLED && BOARD_TUD_RHPORT == 1) || (CFG_TUH_ENABLED && BOARD_TUH_RHPORT == 1)
  // Despite being call USB2_OTG
  // OTG_HS is marked as RHPort1 by TinyUSB to be consistent across stm32 port
  struct {
    GPIO_TypeDef* port;
    uint32_t pin;
  } const ulpi_pins[] = {
    ULPI_PINS
  };

  for (uint8_t i=0; i < sizeof(ulpi_pins)/sizeof(ulpi_pins[0]); i++) {
    GPIO_InitStruct.Pin       = ulpi_pins[i].pin;
    GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull      = GPIO_NOPULL;
    GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG2_HS;
    HAL_GPIO_Init(ulpi_pins[i].port, &GPIO_InitStruct);
  }

  // Enable USB HS & ULPI Clocks
  __HAL_RCC_USB1_OTG_HS_ULPI_CLK_ENABLE();
  __HAL_RCC_USB1_OTG_HS_CLK_ENABLE();

  #if CFG_TUD_ENABLED && BOARD_TUD_RHPORT == 1
  tud_configure_dwc2_t cfg = CFG_TUD_CONFIGURE_DWC2_DEFAULT;
  cfg.vbus_sensing = OTG_HS_VBUS_SENSE;
  tud_configure(1, TUD_CFGID_DWC2, &cfg);
  #endif
#endif

  HAL_PWREx_EnableUSBVoltageDetector();

  board_init2(); // optional init

  // Turn off device vbus
#if CFG_TUD_ENABLED
  board_vbus_set(BOARD_TUD_RHPORT, false);
#endif
  // Turn on host vbus
#if CFG_TUH_ENABLED
  board_vbus_set(BOARD_TUH_RHPORT, true);
#endif

}

//--------------------------------------------------------------------+
// Board porting API
//--------------------------------------------------------------------+

void board_led_write(bool state) {
#ifdef PINID_LED
  board_pindef_t* pindef = &board_pindef[PINID_LED];
  GPIO_PinState pin_state = state == pindef->active_state ? GPIO_PIN_SET : GPIO_PIN_RESET;
  HAL_GPIO_WritePin(pindef->port, pindef->pin_init.Pin, pin_state);
#else
  (void) state;
#endif
}

uint32_t board_button_read(void) {
#ifdef PINID_BUTTON
  board_pindef_t* pindef = &board_pindef[PINID_BUTTON];
  return pindef->active_state == HAL_GPIO_ReadPin(pindef->port, pindef->pin_init.Pin);
#else
  return 0;
#endif
}

size_t board_get_unique_id(uint8_t id[], size_t max_len) {
  (void) max_len;
  volatile uint32_t * stm32_uuid = (volatile uint32_t *) UID_BASE;
  uint32_t* id32 = (uint32_t*) (uintptr_t) id;
  uint8_t const len = 12;

  id32[0] = stm32_uuid[0];
  id32[1] = stm32_uuid[1];
  id32[2] = stm32_uuid[2];

  return len;
}

int board_uart_read(uint8_t *buf, int len) {
#ifdef UART_ID
  int count = 0;
  // clear overrun error if any
  if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_ORE)) {
    __HAL_UART_CLEAR_FLAG(&UartHandle, UART_CLEAR_OREF);
  }
  for (int i = 0; i < len; i++) {
    if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_RXNE)) {
      buf[i] = (uint8_t) UartHandle.Instance->RDR;
      count++;
    } else {
      break;
    }
  }
  return count;
#else
  (void) buf; (void) len;
  return 0;
#endif
}

int board_uart_write(void const *buf, int len) {
#ifdef UART_ID
  const uint8_t *p = (const uint8_t *) buf;
  int count = 0;
  while (count < len) {
    if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_TXE)) {
      UartHandle.Instance->TDR = p[count];
      count++;
    } else {
      break;
    }
  }
  return count;
#else
  (void) buf; (void) len;
  return -1;
#endif
}

#if CFG_TUSB_OS == OPT_OS_NONE
volatile uint32_t system_ticks = 0;

void SysTick_Handler(void) {
  HAL_IncTick();
  system_ticks++;
}

uint32_t tusb_time_millis_api(void) {
  return system_ticks;
}

#elif CFG_TUSB_OS == OPT_OS_THREADX
// Keep HAL_GetTick() working for HAL functions called from board_init()
void osal_threadx_tick_cb(void) {
  HAL_IncTick();
}
#endif

void HardFault_Handler(void) {
  __asm("BKPT #0\n");
}

// Required by __libc_init_array in startup code if we are compiling using
// -nostdlib/-nostartfiles.
void _init(void) {
}
