1  // Copyright 2019 Espressif Systems (Shanghai) PTE LTD
 2  //
 3  // Licensed under the Apache License, Version 2.0 (the "License");
 4  // you may not use this file except in compliance with the License.
 5  // You may obtain a copy of the License at
 6  //
 7  //     http://www.apache.org/licenses/LICENSE-2.0
 8  //
 9  // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  #include "bootloader_common.h"
16  #include "bootloader_clock.h"
17  #include "soc/efuse_reg.h"
18  #include "soc/apb_ctrl_reg.h"
19  
20  uint8_t bootloader_common_get_chip_revision(void)
21  {
22      uint8_t eco_bit0, eco_bit1, eco_bit2;
23      eco_bit0 = (REG_READ(EFUSE_BLK0_RDATA3_REG) & 0xF000) >> 15;
24      eco_bit1 = (REG_READ(EFUSE_BLK0_RDATA5_REG) & 0x100000) >> 20;
25      eco_bit2 = (REG_READ(APB_CTRL_DATE_REG) & 0x80000000) >> 31;
26      uint32_t combine_value = (eco_bit2 << 2) | (eco_bit1 << 1) | eco_bit0;
27      uint8_t chip_ver = 0;
28      switch (combine_value) {
29      case 0:
30          chip_ver = 0;
31          break;
32      case 1:
33          chip_ver = 1;
34          break;
35      case 3:
36          chip_ver = 2;
37          break;
38      case 7:
39          chip_ver = 3;
40          break;
41      default:
42          chip_ver = 0;
43          break;
44      }
45      return chip_ver;
46  }
47  
48  uint32_t bootloader_common_get_chip_ver_pkg(void)
49  {
50      uint32_t pkg_version = REG_GET_FIELD(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_VER_PKG);
51      uint32_t pkg_version_4bit = REG_GET_FIELD(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_VER_PKG_4BIT);
52      return (pkg_version_4bit << 3) | pkg_version;
53  }
54  
55  int bootloader_clock_get_rated_freq_mhz()
56  {
57      //Check if ESP32 is rated for a CPU frequency of 160MHz only
58      if (REG_GET_BIT(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_CPU_FREQ_RATED) &&
59          REG_GET_BIT(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_CPU_FREQ_LOW)) {
60          return 160;
61      }
62      return 240;
63  }