src/hw_esp32.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * Copyright 2018 apeos contributors
   4  *
   5  * apeos Espressif esp-32 hardware interface functions
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <apeos/apeos.h>
  22 #include <apeos/hw.h>
  23 #include <rom/ets_sys.h>         /* ets_printf */
  24 #include <rom/spi_flash.h>       /* g_rom_flashchip */
  25 #include <soc/rtc_cntl_reg.h>    /* RTC_CNTL_WDTCONFIG0_REG */
  26 #include <soc/timer_group_reg.h> /* TIMG_WDTCONFIG0_REG */
  27 #include <soc/cpu.h>             /* esp_cpu_stall() */
  28 #include <soc/efuse_reg.h>       /* EFUSE_BLK0_RDATA3_REG */
  29
  30 static void esp32_disable_watchdog(void)
  31 {
  32   REG_CLR_BIT(RTC_CNTL_WDTCONFIG0_REG, RTC_CNTL_WDT_FLASHBOOT_MOD_EN);
  33   REG_CLR_BIT(TIMG_WDTCONFIG0_REG(0), TIMG_WDT_FLASHBOOT_MOD_EN);
  34 }
  35
  36 void hw_init(void)
  37 {
  38   ets_printf("apeos booting\n");
  39   esp32_disable_watchdog();
  40 }
  41
  42 void hw_uninit(void)
  43 {
  44   esp_cpu_stall(0);
  45 }
  46
  47 static
  48 bool
  49 esp32_package_get_info(
  50   uint32_t efuse_blk0_rdata3_reg,
  51   bool * embedded_flash_ptr,
  52   const char ** package_description_ptr_ptr)
  53 {
  54   const char * package_description_ptr;
  55   bool embedded_flash;
  56
  57   switch ((efuse_blk0_rdata3_reg & EFUSE_RD_CHIP_VER_PKG_M)
  58           >> EFUSE_RD_CHIP_VER_PKG_S)
  59   {
  60   case EFUSE_RD_CHIP_VER_PKG_ESP32D2WDQ5:
  61     package_description_ptr = "D2WDQ5";
  62     embedded_flash = true;
  63     break;
  64   case EFUSE_RD_CHIP_VER_PKG_ESP32PICOD2:
  65     package_description_ptr = "PICOD2";
  66     embedded_flash = true;
  67     break;
  68   case EFUSE_RD_CHIP_VER_PKG_ESP32PICOD4:
  69     package_description_ptr = "PICOD4";
  70     embedded_flash = true;
  71     break;
  72   default:
  73     package_description_ptr = NULL;
  74   }
  75
  76   if (package_description_ptr == NULL)  /* unknown chip package */
  77   {
  78     *package_description_ptr_ptr = "unknown";
  79     return false;
  80   }
  81
  82   *package_description_ptr_ptr = package_description_ptr;
  83   *embedded_flash_ptr = embedded_flash;
  84   return true;
  85 }
  86
  87 /* Print chip information */
  88 void hw_info(void)
  89 {
  90   uint32_t reg;
  91   bool known_package;
  92   bool embedded_flash;
  93   const char * package_description_ptr;
  94   bool bluetooth;
  95   uint32_t spiflash_chip_size;
  96
  97   reg = REG_READ(EFUSE_BLK0_RDATA3_REG);
  98
  99   known_package = esp32_package_get_info(
 100     reg,
 101     &embedded_flash,
 102     &package_description_ptr);
 103
 104   /* bluetooth is enabled if not found disabled in efuse */
 105   bluetooth = (reg & EFUSE_RD_CHIP_VER_DIS_BT_M) == 0;
 106
 107   /* size of SPI flash chip, in bytes */
 108   spiflash_chip_size = g_rom_flashchip.chip_size;
 109
 110   ets_printf(
 111     "ESP32 SoC");
 112
 113   if (known_package)
 114   {
 115     ets_printf(
 116       ", %s package",
 117       package_description_ptr);
 118   }
 119
 120   ets_printf(
 121     ", silicon revision %d", ((reg & EFUSE_RD_CHIP_VER_REV1_M) != 0) ? 1 : 0);
 122
 123   ets_printf(
 124     ", %d CPU cores",
 125     ((reg & EFUSE_RD_CHIP_VER_DIS_APP_CPU_M) == 0) ? 2 : 1);
 126
 127   ets_printf(
 128     ", bluetooth %s",
 129     bluetooth ? "enabled" : "disabled");
 130
 131   ets_printf(
 132     ", %u byte %sflash\n",
 133     (unsigned int)spiflash_chip_size,
 134     known_package ? (embedded_flash ? "embedded " : "external ") : "");
 135 }