pinebuds/platform/cmsis/system_utils.c

/***************************************************************************
 *
 * Copyright 2015-2019 BES.
 * All rights reserved. All unpublished rights reserved.
 *
 * No part of this work may be used or reproduced in any form or by any
 * means, or stored in a database or retrieval system, without prior written
 * permission of BES.
 *
 * Use of this work is governed by a license granted by BES.
 * This work contains confidential and proprietary information of
 * BES. which is protected by copyright, trade secret,
 * trademark and other intellectual property rights.
 *
 ****************************************************************************/
#include "cmsis.h"
#include "hal_cache.h"
#include "hal_cmu.h"
#include "hal_location.h"
#include "hal_psram.h"
#include "hal_psramuhs.h"
#if !defined(NOSTD) && defined(ACCURATE_DB_TO_FLOAT)
#include <math.h>
#endif
#ifdef __ARMCC_VERSION
#include "link_sym_armclang.h"
#endif

#ifdef BOOT_CODE_IN_RAM
#define MUTEX_CODE_LOC BOOT_TEXT_SRAM_LOC
#else
#define MUTEX_CODE_LOC
#endif

extern uint32_t __got_info_start[];

void BOOT_TEXT_FLASH_LOC GotBaseInit(void) {
#ifndef __ARMCC_VERSION
  asm volatile("ldr r9, =__got_info_start");
#endif
}

#ifndef __ARM_ARCH_ISA_ARM
// -----------------------------------------------------------
// Boot initialization
// CAUTION: This function and all the functions it called must
//          NOT access global data/bss, for the global data/bss
//          is not available at that time.
// -----------------------------------------------------------
extern uint32_t __boot_sram_start_flash__[];
extern uint32_t __boot_sram_end_flash__[];
extern uint32_t __boot_sram_start__[];
extern uint32_t __boot_bss_sram_start__[];
extern uint32_t __boot_bss_sram_end__[];

extern uint32_t __sram_text_data_start_flash__[];
extern uint32_t __sram_text_data_end_flash__[];
extern uint32_t __sram_text_data_start__[];
extern uint32_t __sram_bss_start__[];
extern uint32_t __sram_bss_end__[];
extern uint32_t __fast_sram_text_data_start__[];
extern uint32_t __fast_sram_text_data_end__[];
extern uint32_t __fast_sram_text_data_start_flash__[];
extern uint32_t __fast_sram_text_data_end_flash__[];

void BOOT_TEXT_FLASH_LOC BootInit(void) {
  uint32_t *dst, *src;

  // Enable icache
  hal_cache_enable(HAL_CACHE_ID_I_CACHE);
  // Enable dcache
  hal_cache_enable(HAL_CACHE_ID_D_CACHE);
  // Enable write buffer
  hal_cache_writebuffer_enable(HAL_CACHE_ID_D_CACHE);
  // Enable write back
  hal_cache_writeback_enable(HAL_CACHE_ID_D_CACHE);

  // Init GOT base register
  GotBaseInit();

  // Init boot sections
  for (dst = __boot_sram_start__, src = __boot_sram_start_flash__;
       src < __boot_sram_end_flash__; dst++, src++) {
    *dst = *src;
  }

  for (dst = __boot_bss_sram_start__; dst < __boot_bss_sram_end__; dst++) {
    *dst = 0;
  }

  hal_cmu_setup();

  for (dst = __sram_text_data_start__, src = __sram_text_data_start_flash__;
       src < __sram_text_data_end_flash__; dst++, src++) {
    *dst = *src;
  }

  for (dst = __sram_bss_start__; dst < __sram_bss_end__; dst++) {
    *dst = 0;
  }

  for (dst = __fast_sram_text_data_start__,
      src = __fast_sram_text_data_start_flash__;
       src < __fast_sram_text_data_end_flash__; dst++, src++) {
    *dst = *src;
  }

  // Init psram
#if defined(CHIP_HAS_PSRAM) && defined(PSRAM_ENABLE)
  hal_psram_init();
#endif

  // Init psramuhs
#if defined(CHIP_HAS_PSRAMUHS) && defined(PSRAMUHS_ENABLE)
  hal_cmu_dsp_clock_enable();
  hal_cmu_dsp_reset_clear();
  hal_psramuhs_init();
#endif
}
#endif

// -----------------------------------------------------------
// Mutex flag
// -----------------------------------------------------------

int MUTEX_CODE_LOC set_bool_flag(bool *flag) {
  bool busy;

  do {
    busy = (bool)__LDREXB((unsigned char *)flag);
    if (busy) {
      __CLREX();
      return -1;
    }
  } while (__STREXB(true, (unsigned char *)flag));
  __DMB();

  return 0;
}

void MUTEX_CODE_LOC clear_bool_flag(bool *flag) {
  *flag = false;
  __DMB();
}

// -----------------------------------------------------------
// Misc
// -----------------------------------------------------------

float db_to_float(float db) {
  float coef;

#if !defined(NOSTD) && defined(ACCURATE_DB_TO_FLOAT)
  // The math lib will consume 4K+ bytes of space
  coef = powf(10, db / 20);
#else
  static const float factor_m9db = 0.354813389234;
  static const float factor_m3db = 0.707945784384;
  static const float factor_m1db = 0.891250938134;
  static const float factor_m0p5db = 0.944060876286;
  static const float factor_m0p1db = 0.988553094657;

  coef = 1.0;

  if (db < 0) {
    while (1) {
      if (db <= -9.0) {
        db += 9.0;
        coef *= factor_m9db;
      } else if (db <= -3.0) {
        db += 3.0;
        coef *= factor_m3db;
      } else if (db <= -1.0) {
        db += 1.0;
        coef *= factor_m1db;
      } else if (db <= -0.5) {
        db += 0.5;
        coef *= factor_m0p5db;
      } else if (db <= -0.1 / 2) {
        db += 0.1;
        coef *= factor_m0p1db;
      } else {
        break;
      }
    }
  } else if (db > 0) {
    while (1) {
      if (db >= 9.0) {
        db -= 9.0;
        coef /= factor_m9db;
      } else if (db >= 3.0) {
        db -= 3.0;
        coef /= factor_m3db;
      } else if (db >= 1.0) {
        db -= 1.0;
        coef /= factor_m1db;
      } else if (db >= 0.5) {
        db -= 0.5;
        coef /= factor_m0p5db;
      } else if (db >= 0.1 / 2) {
        db -= 0.1;
        coef /= factor_m0p1db;
      } else {
        break;
      }
    }
  }
#endif

  return coef;
}

uint32_t get_msb_pos(uint32_t val) {
  uint32_t lead_zero;

  lead_zero = __CLZ(val);
  return (lead_zero >= 32) ? 32 : 31 - lead_zero;
}

uint32_t get_lsb_pos(uint32_t val) { return __CLZ(__RBIT(val)); }

uint32_t integer_sqrt(uint32_t val) {
  unsigned int msb;
  unsigned int x;
  unsigned int y;

  if (val == 0) {
    return 0;
  }

  for (msb = 31; msb > 0; msb--) {
    if (val & (1 << msb)) {
      break;
    }
  }

  x = ((1 << msb) + 1) / 2;

  while (1) {
    y = (x + val / x) / 2;
    if (y >= x) {
      break;
    }
    x = y;
  }

  return x;
}

uint32_t integer_sqrt_nearest(uint32_t val) {
  unsigned int s;

  s = integer_sqrt(val * 4);
  return (s + 1) / 2;
}