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 "esp_efuse.h"
16 #include "esp_efuse_utility.h"
17 #include "soc/efuse_periph.h"
18 #include "assert.h"
19 #include "sdkconfig.h"
20 #include "esp_efuse_table.h"
21
22 const static char *TAG = "efuse";
23
24 // Sets a write protection for the whole block.
esp_efuse_set_write_protect(esp_efuse_block_t blk)25 esp_err_t esp_efuse_set_write_protect(esp_efuse_block_t blk)
26 {
27 if (blk == EFUSE_BLK1) {
28 return esp_efuse_write_field_cnt(ESP_EFUSE_WR_DIS_BLK1, 1);
29 } else if (blk == EFUSE_BLK2) {
30 return esp_efuse_write_field_cnt(ESP_EFUSE_WR_DIS_BLK2, 1);
31 } else if (blk == EFUSE_BLK3) {
32 return esp_efuse_write_field_cnt(ESP_EFUSE_WR_DIS_BLK3, 1);
33 }
34 return ESP_ERR_NOT_SUPPORTED;
35 }
36
37 // read protect for blk.
esp_efuse_set_read_protect(esp_efuse_block_t blk)38 esp_err_t esp_efuse_set_read_protect(esp_efuse_block_t blk)
39 {
40 if (blk == EFUSE_BLK1) {
41 return esp_efuse_write_field_cnt(ESP_EFUSE_RD_DIS_BLK1, 1);
42 } else if (blk == EFUSE_BLK2) {
43 return esp_efuse_write_field_cnt(ESP_EFUSE_RD_DIS_BLK2, 1);
44 } else if (blk == EFUSE_BLK3) {
45 return esp_efuse_write_field_cnt(ESP_EFUSE_RD_DIS_BLK3, 1);
46 }
47 return ESP_ERR_NOT_SUPPORTED;
48 }
49
50 // get efuse coding_scheme.
esp_efuse_get_coding_scheme(esp_efuse_block_t blk)51 esp_efuse_coding_scheme_t esp_efuse_get_coding_scheme(esp_efuse_block_t blk)
52 {
53 esp_efuse_coding_scheme_t scheme;
54 if (blk == EFUSE_BLK0) {
55 scheme = EFUSE_CODING_SCHEME_NONE;
56 } else {
57 uint32_t coding_scheme = REG_GET_FIELD(EFUSE_BLK0_RDATA6_REG, EFUSE_CODING_SCHEME);
58 if (coding_scheme == EFUSE_CODING_SCHEME_VAL_NONE ||
59 coding_scheme == (EFUSE_CODING_SCHEME_VAL_34 | EFUSE_CODING_SCHEME_VAL_REPEAT)) {
60 scheme = EFUSE_CODING_SCHEME_NONE;
61 } else if (coding_scheme == EFUSE_CODING_SCHEME_VAL_34) {
62 scheme = EFUSE_CODING_SCHEME_3_4;
63 } else {
64 scheme = EFUSE_CODING_SCHEME_REPEAT;
65 }
66 }
67 ESP_EARLY_LOGD(TAG, "coding scheme %d", scheme);
68 return scheme;
69 }
70