components/bootloader_support/src/efuse.c

   1 // Copyright 2015-2016 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 #include "esp_efuse.h"
  15 #include "esp_log.h"
  16
  17 #define EFUSE_CONF_WRITE 0x5A5A /* efuse_pgm_op_ena, force no rd/wr disable */
  18 #define EFUSE_CONF_READ 0x5AA5 /* efuse_read_op_ena, release force */
  19
  20 #define EFUSE_CMD_PGM 0x02
  21 #define EFUSE_CMD_READ 0x01
  22
  23 static const char *TAG = "efuse";
  24
  25 void esp_efuse_burn_new_values(void)
  26 {
  27     REG_WRITE(EFUSE_CONF_REG, EFUSE_CONF_WRITE);
  28     REG_WRITE(EFUSE_CMD_REG,  EFUSE_CMD_PGM);
  29     while (REG_READ(EFUSE_CMD_REG) != 0) {
  30     }
  31     REG_WRITE(EFUSE_CONF_REG, EFUSE_CONF_READ);
  32     REG_WRITE(EFUSE_CMD_REG,  EFUSE_CMD_READ);
  33     while (REG_READ(EFUSE_CMD_REG) != 0) {
  34     }
  35     esp_efuse_reset();
  36 }
  37
  38 void esp_efuse_reset(void)
  39 {
  40     REG_WRITE(EFUSE_CONF_REG, EFUSE_CONF_READ);
  41     const uint32_t block_start[4] = { EFUSE_BLK0_WDATA0_REG, EFUSE_BLK1_WDATA0_REG,
  42                                       EFUSE_BLK2_WDATA0_REG, EFUSE_BLK3_WDATA0_REG };
  43     const uint32_t block_end[4] = { EFUSE_BLK0_WDATA6_REG, EFUSE_BLK1_WDATA7_REG,
  44                                     EFUSE_BLK2_WDATA7_REG, EFUSE_BLK3_WDATA7_REG };
  45     for (int i = 0; i < 4; i++) {
  46       for (uint32_t r = block_start[i]; r <= block_end[i]; r+= 4) {
  47         REG_WRITE(r, 0);
  48       }
  49     }
  50 }
  51
  52 void esp_efuse_disable_basic_rom_console(void)
  53 {
  54     if ((REG_READ(EFUSE_BLK0_RDATA6_REG) & EFUSE_RD_CONSOLE_DEBUG_DISABLE) == 0) {
  55         ESP_EARLY_LOGI(TAG, "Disable BASIC ROM Console fallback via efuse...");
  56         esp_efuse_reset();
  57         REG_WRITE(EFUSE_BLK0_WDATA6_REG, EFUSE_RD_CONSOLE_DEBUG_DISABLE);
  58         esp_efuse_burn_new_values();
  59     }
  60 }