rtc: support access internal i2c register

components/bootloader/subproject/main/ld/esp32s2/bootloader.ld

@@ -44,6 +44,7 @@ SECTIONS
     *libhal.a:wdt_hal_iram.*(.literal .text .literal.* .text.*)
     *libsoc.a:rtc_clk.*(.literal .text .literal.* .text.*)
     *libsoc.a:rtc_time.*(.literal .text .literal.* .text.*)
+    *libsoc.a:i2c_rtc_clk.*(.literal .text .literal.* .text.*)
     *libefuse.a:*.*(.literal .text .literal.* .text.*)
     *(.fini.literal)
     *(.fini)

components/hal/esp32s2/include/hal/adc_ll.h

@@ -69,62 +69,6 @@ typedef enum {
     ADC2_CTRL_FORCE_DIG = 6,    /*!<For ADC2. Arbiter in shield mode. Force select digital controller work. */
 } adc_controller_t;
 
-/* ADC calibration defines. */
-#define ADC_LL_I2C_ADC            0X69
-#define ADC_LL_I2C_ADC_HOSTID     0
-
-#define ADC_LL_ANA_CONFIG2_REG  0x6000E048
-
-#define ADC_LL_SAR1_ENCAL_GND_ADDR 0x7
-#define ADC_LL_SAR1_ENCAL_GND_ADDR_MSB 5
-#define ADC_LL_SAR1_ENCAL_GND_ADDR_LSB 5
-
-#define ADC_LL_SAR2_ENCAL_GND_ADDR 0x7
-#define ADC_LL_SAR2_ENCAL_GND_ADDR_MSB 7
-#define ADC_LL_SAR2_ENCAL_GND_ADDR_LSB 7
-
-#define ADC_LL_SAR1_INITIAL_CODE_HIGH_ADDR 0x1
-#define ADC_LL_SAR1_INITIAL_CODE_HIGH_ADDR_MSB 0x3
-#define ADC_LL_SAR1_INITIAL_CODE_HIGH_ADDR_LSB 0x0
-
-#define ADC_LL_SAR1_INITIAL_CODE_LOW_ADDR  0x0
-#define ADC_LL_SAR1_INITIAL_CODE_LOW_ADDR_MSB  0x7
-#define ADC_LL_SAR1_INITIAL_CODE_LOW_ADDR_LSB  0x0
-
-#define ADC_LL_SAR2_INITIAL_CODE_HIGH_ADDR 0x4
-#define ADC_LL_SAR2_INITIAL_CODE_HIGH_ADDR_MSB 0x3
-#define ADC_LL_SAR2_INITIAL_CODE_HIGH_ADDR_LSB 0x0
-
-#define ADC_LL_SAR2_INITIAL_CODE_LOW_ADDR  0x3
-#define ADC_LL_SAR2_INITIAL_CODE_LOW_ADDR_MSB  0x7
-#define ADC_LL_SAR2_INITIAL_CODE_LOW_ADDR_LSB  0x0
-
-#define ADC_LL_SAR1_DREF_ADDR  0x2
-#define ADC_LL_SAR1_DREF_ADDR_MSB  0x6
-#define ADC_LL_SAR1_DREF_ADDR_LSB  0x4
-
-#define ADC_LL_SAR2_DREF_ADDR  0x5
-#define ADC_LL_SAR2_DREF_ADDR_MSB  0x6
-#define ADC_LL_SAR2_DREF_ADDR_LSB  0x4
-
-#define ADC_LL_SAR1_SAMPLE_CYCLE_ADDR 0x2
-#define ADC_LL_SAR1_SAMPLE_CYCLE_ADDR_MSB 0x2
-#define ADC_LL_SAR1_SAMPLE_CYCLE_ADDR_LSB 0x0
-
-#define ADC_LL_SARADC_DTEST_RTC_ADDR 0x7
-#define ADC_LL_SARADC_DTEST_RTC_ADDR_MSB 1
-#define ADC_LL_SARADC_DTEST_RTC_ADDR_LSB 0
-
-#define ADC_LL_SARADC_ENT_TSENS_ADDR 0x7
-#define ADC_LL_SARADC_ENT_TSENS_ADDR_MSB 2
-#define ADC_LL_SARADC_ENT_TSENS_ADDR_LSB 2
-
-#define ADC_LL_SARADC_ENT_RTC_ADDR 0x7
-#define ADC_LL_SARADC_ENT_RTC_ADDR_MSB 3
-#define ADC_LL_SARADC_ENT_RTC_ADDR_LSB 3
-
-/* ADC calibration defines end. */
-
 /*---------------------------------------------------------------
                     Digital controller setting
 ---------------------------------------------------------------*/
@@ -155,13 +99,11 @@ static inline void adc_ll_digi_set_fsm_time(uint32_t rst_wait, uint32_t start_wa
 static inline void adc_ll_set_sample_cycle(uint32_t sample_cycle)
 {
     /* Should be called before writing I2C registers. */
-    void phy_get_romfunc_addr(void);
-    phy_get_romfunc_addr();
     SET_PERI_REG_MASK(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_SAR_I2C_FORCE_PU_M);
     CLEAR_PERI_REG_MASK(ANA_CONFIG_REG, BIT(18));
-    SET_PERI_REG_MASK(ADC_LL_ANA_CONFIG2_REG, BIT(16));
+    SET_PERI_REG_MASK(ADC_ANA_CONFIG2_REG, BIT(16));
 
-    I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR1_SAMPLE_CYCLE_ADDR, sample_cycle);
+    I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR1_SAMPLE_CYCLE_ADDR, sample_cycle);
 }
 
 /**
@@ -1194,27 +1136,25 @@ static inline void adc_ll_disable_sleep_controller(void)
 static inline void adc_ll_calibration_prepare(adc_ll_num_t adc_n, adc_channel_t channel, bool internal_gnd)
 {
     /* Should be called before writing I2C registers. */
-    void phy_get_romfunc_addr(void);
-    phy_get_romfunc_addr();
     CLEAR_PERI_REG_MASK(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_SAR_I2C_FORCE_PD_M);
     SET_PERI_REG_MASK(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_SAR_I2C_FORCE_PU_M);
     CLEAR_PERI_REG_MASK(ANA_CONFIG_REG, BIT(18));
-    SET_PERI_REG_MASK(ADC_LL_ANA_CONFIG2_REG, BIT(16));
+    SET_PERI_REG_MASK(ADC_ANA_CONFIG2_REG, BIT(16));
 
     /* Enable/disable internal connect GND (for calibration). */
     if (adc_n == ADC_NUM_1) {
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR1_DREF_ADDR, 4);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR1_DREF_ADDR, 4);
         if (internal_gnd) {
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR1_ENCAL_GND_ADDR, 1);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR1_ENCAL_GND_ADDR, 1);
         } else {
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR1_ENCAL_GND_ADDR, 0);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR1_ENCAL_GND_ADDR, 0);
         }
     } else {
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR2_DREF_ADDR, 4);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR2_DREF_ADDR, 4);
         if (internal_gnd) {
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR2_ENCAL_GND_ADDR, 1);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR2_ENCAL_GND_ADDR, 1);
         } else {
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR2_ENCAL_GND_ADDR, 0);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR2_ENCAL_GND_ADDR, 0);
         }
     }
 }
@@ -1227,9 +1167,9 @@ static inline void adc_ll_calibration_prepare(adc_ll_num_t adc_n, adc_channel_t
 static inline void adc_ll_calibration_finish(adc_ll_num_t adc_n)
 {
     if (adc_n == ADC_NUM_1) {
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR1_ENCAL_GND_ADDR, 0);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR1_ENCAL_GND_ADDR, 0);
     } else {
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR2_ENCAL_GND_ADDR, 0);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR2_ENCAL_GND_ADDR, 0);
     }
 }
 
@@ -1245,18 +1185,16 @@ static inline void adc_ll_set_calibration_param(adc_ll_num_t adc_n, uint32_t par
     uint8_t msb = param >> 8;
     uint8_t lsb = param & 0xFF;
     /* Should be called before writing I2C registers. */
-    void phy_get_romfunc_addr(void);
-    phy_get_romfunc_addr();
     SET_PERI_REG_MASK(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_SAR_I2C_FORCE_PU_M);
     CLEAR_PERI_REG_MASK(ANA_CONFIG_REG, BIT(18));
-    SET_PERI_REG_MASK(ADC_LL_ANA_CONFIG2_REG, BIT(16));
+    SET_PERI_REG_MASK(ADC_ANA_CONFIG2_REG, BIT(16));
 
     if (adc_n == ADC_NUM_1) {
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR1_INITIAL_CODE_HIGH_ADDR, msb);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR1_INITIAL_CODE_HIGH_ADDR, msb);
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR1_INITIAL_CODE_LOW_ADDR, lsb);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR1_INITIAL_CODE_LOW_ADDR, lsb);
     } else {
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR2_INITIAL_CODE_HIGH_ADDR, msb);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR2_INITIAL_CODE_HIGH_ADDR, msb);
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SAR2_INITIAL_CODE_LOW_ADDR, lsb);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SAR2_INITIAL_CODE_LOW_ADDR, lsb);
     }
 }
 /* Temp code end. */
@@ -1275,23 +1213,21 @@ static inline void adc_ll_set_calibration_param(adc_ll_num_t adc_n, uint32_t par
 static inline void adc_ll_vref_output(adc_ll_num_t adc, adc_channel_t channel, bool en)
 {
     /* Should be called before writing I2C registers. */
-    void phy_get_romfunc_addr(void);
-    phy_get_romfunc_addr();
     SET_PERI_REG_MASK(RTC_CNTL_ANA_CONF_REG, RTC_CNTL_SAR_I2C_FORCE_PU_M);
     CLEAR_PERI_REG_MASK(ANA_CONFIG_REG, BIT(18));
-    SET_PERI_REG_MASK(ADC_LL_ANA_CONFIG2_REG, BIT(16));
+    SET_PERI_REG_MASK(ADC_ANA_CONFIG2_REG, BIT(16));
 
     if (en) {
         if (adc == ADC_NUM_1) {
             /* Config test mux to route v_ref to ADC1 Channels */
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SARADC_DTEST_RTC_ADDR, 1);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SARADC_DTEST_RTC_ADDR, 1);
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SARADC_ENT_TSENS_ADDR, 0);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SARADC_ENT_TSENS_ADDR, 0);
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SARADC_ENT_RTC_ADDR, 1);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SARADC_ENT_RTC_ADDR, 1);
         } else {
             /* Config test mux to route v_ref to ADC2 Channels */
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SARADC_DTEST_RTC_ADDR, 0);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SARADC_DTEST_RTC_ADDR, 0);
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SARADC_ENT_TSENS_ADDR, 1);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SARADC_ENT_TSENS_ADDR, 1);
-            I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SARADC_ENT_RTC_ADDR, 0);
+            I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SARADC_ENT_RTC_ADDR, 0);
         }
         //in sleep force to use rtc to control ADC
         SENS.sar_meas2_mux.sar2_rtc_force = 1;
@@ -1302,8 +1238,8 @@ static inline void adc_ll_vref_output(adc_ll_num_t adc, adc_channel_t channel, b
         //set en_pad for ADC2 channels (bits 0x380)
         SENS.sar_meas2_ctrl2.sar2_en_pad = 1 << channel;
     } else {
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SARADC_ENT_TSENS_ADDR, 0);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SARADC_ENT_TSENS_ADDR, 0);
-        I2C_WRITEREG_MASK_RTC(ADC_LL_I2C_ADC, ADC_LL_SARADC_ENT_RTC_ADDR, 0);
+        I2C_WRITEREG_MASK_RTC(I2C_SAR_ADC, ADC_SARADC_ENT_RTC_ADDR, 0);
         SENS.sar_meas2_mux.sar2_rtc_force = 0;
         //set sar2_en_test
         SENS.sar_meas2_ctrl1.sar2_en_test = 0;

components/soc/soc/esp32s2/i2c_saradc.h

@@ -0,0 +1,77 @@
+// Copyright 2019-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+/**
+ * @file i2c_sar.h
+ * @brief Register definitions for analog to calibrate initial code for getting a more precise voltage of SAR ADC.
+ *
+ * This file lists register fields of SAR, located on an internal configuration
+ * bus. These definitions are used via macros defined in i2c_rtc_clk.h, by
+ * function in adc_ll.h.
+ */
+
+#define I2C_SAR_ADC            0X69
+#define I2C_SAR_ADC_HOSTID     0
+
+#define ADC_ANA_CONFIG2_REG  0x6000E048
+
+#define ADC_SAR1_ENCAL_GND_ADDR 0x7
+#define ADC_SAR1_ENCAL_GND_ADDR_MSB 5
+#define ADC_SAR1_ENCAL_GND_ADDR_LSB 5
+
+#define ADC_SAR2_ENCAL_GND_ADDR 0x7
+#define ADC_SAR2_ENCAL_GND_ADDR_MSB 7
+#define ADC_SAR2_ENCAL_GND_ADDR_LSB 7
+
+#define ADC_SAR1_INITIAL_CODE_HIGH_ADDR 0x1
+#define ADC_SAR1_INITIAL_CODE_HIGH_ADDR_MSB 0x3
+#define ADC_SAR1_INITIAL_CODE_HIGH_ADDR_LSB 0x0
+
+#define ADC_SAR1_INITIAL_CODE_LOW_ADDR  0x0
+#define ADC_SAR1_INITIAL_CODE_LOW_ADDR_MSB  0x7
+#define ADC_SAR1_INITIAL_CODE_LOW_ADDR_LSB  0x0
+
+#define ADC_SAR2_INITIAL_CODE_HIGH_ADDR 0x4
+#define ADC_SAR2_INITIAL_CODE_HIGH_ADDR_MSB 0x3
+#define ADC_SAR2_INITIAL_CODE_HIGH_ADDR_LSB 0x0
+
+#define ADC_SAR2_INITIAL_CODE_LOW_ADDR  0x3
+#define ADC_SAR2_INITIAL_CODE_LOW_ADDR_MSB  0x7
+#define ADC_SAR2_INITIAL_CODE_LOW_ADDR_LSB  0x0
+
+#define ADC_SAR1_DREF_ADDR  0x2
+#define ADC_SAR1_DREF_ADDR_MSB  0x6
+#define ADC_SAR1_DREF_ADDR_LSB  0x4
+
+#define ADC_SAR2_DREF_ADDR  0x5
+#define ADC_SAR2_DREF_ADDR_MSB  0x6
+#define ADC_SAR2_DREF_ADDR_LSB  0x4
+
+#define ADC_SAR1_SAMPLE_CYCLE_ADDR 0x2
+#define ADC_SAR1_SAMPLE_CYCLE_ADDR_MSB 0x2
+#define ADC_SAR1_SAMPLE_CYCLE_ADDR_LSB 0x0
+
+#define ADC_SARADC_DTEST_RTC_ADDR 0x7
+#define ADC_SARADC_DTEST_RTC_ADDR_MSB 1
+#define ADC_SARADC_DTEST_RTC_ADDR_LSB 0
+
+#define ADC_SARADC_ENT_TSENS_ADDR 0x7
+#define ADC_SARADC_ENT_TSENS_ADDR_MSB 2
+#define ADC_SARADC_ENT_TSENS_ADDR_LSB 2
+
+#define ADC_SARADC_ENT_RTC_ADDR 0x7
+#define ADC_SARADC_ENT_RTC_ADDR_MSB 3
+#define ADC_SARADC_ENT_RTC_ADDR_LSB 3

components/soc/src/esp32s2/CMakeLists.txt

@@ -1,5 +1,6 @@
 set(srcs
         "rtc_clk.c"
+        "i2c_rtc_clk.c"
         "rtc_clk_init.c"
         "rtc_init.c"
         "rtc_pm.c"

components/soc/src/esp32s2/i2c_rtc_clk.c

@@ -0,0 +1,169 @@
+// Copyright 2019-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "esp_err.h"
+#include "soc/soc.h"
+#include "soc/apb_ctrl_reg.h"
+#include "i2c_rtc_clk.h"
+#include "i2c_brownout.h"
+#include "esp_log.h"
+
+#define I2C_RTC_WIFI_CLK_EN (APB_CTRL_WIFI_CLK_EN_REG)
+
+#define I2C_RTC_CLK_GATE_EN    (BIT(18))
+#define I2C_RTC_CLK_GATE_EN_M  (BIT(18))
+#define I2C_RTC_CLK_GATE_EN_V  0x1
+#define I2C_RTC_CLK_GATE_EN_S  18
+
+#define I2C_RTC_CONFIG0  0x6000e048
+
+#define I2C_RTC_MAGIC_CTRL 0x00001FFF
+#define I2C_RTC_MAGIC_CTRL_M  ((I2C_RTC_MAGIC_CTRL_V)<<(I2C_RTC_MAGIC_CTRL_S))
+#define I2C_RTC_MAGIC_CTRL_V  0x1FFF
+#define I2C_RTC_MAGIC_CTRL_S  4
+
+#define I2C_RTC_CONFIG1  0x6000e044
+
+#define I2C_RTC_BOD_MASK (BIT(22))
+#define I2C_RTC_BOD_MASK_M  (BIT(22))
+#define I2C_RTC_BOD_MASK_V  0x1
+#define I2C_RTC_BOD_MASK_S  22
+
+#define I2C_RTC_SAR_MASK (BIT(18))
+#define I2C_RTC_SAR_MASK_M  (BIT(18))
+#define I2C_RTC_SAR_MASK_V  0x1
+#define I2C_RTC_SAR_MASK_S  18
+
+#define I2C_RTC_BBPLL_MASK (BIT(17))
+#define I2C_RTC_BBPLL_MASK_M  (BIT(17))
+#define I2C_RTC_BBPLL_MASK_V  0x1
+#define I2C_RTC_BBPLL_MASK_S  17
+
+#define I2C_RTC_APLL_MASK (BIT(14))
+#define I2C_RTC_APLL_MASK_M  (BIT(14))
+#define I2C_RTC_APLL_MASK_V  0x1
+#define I2C_RTC_APLL_MASK_S  14
+
+#define I2C_RTC_ALL_MASK 0x00007FFF
+#define I2C_RTC_ALL_MASK_M  ((I2C_RTC_ALL_MASK_V)<<(I2C_RTC_ALL_MASK_S))
+#define I2C_RTC_ALL_MASK_V  0x7FFF
+#define I2C_RTC_ALL_MASK_S  8
+
+#define I2C_RTC_CONFIG2  0x6000e000
+
+#define I2C_RTC_BUSY (BIT(25))
+#define I2C_RTC_BUSY_M  (BIT(25))
+#define I2C_RTC_BUSY_V  0x1
+#define I2C_RTC_BUSY_S  25
+
+#define I2C_RTC_WR_CNTL (BIT(24))
+#define I2C_RTC_WR_CNTL_M  (BIT(24))
+#define I2C_RTC_WR_CNTL_V  0x1
+#define I2C_RTC_WR_CNTL_S  24
+
+#define I2C_RTC_DATA 0x000000FF
+#define I2C_RTC_DATA_M  ((I2C_RTC_DATA_V)<<(I2C_RTC_DATA_S))
+#define I2C_RTC_DATA_V  0xFF
+#define I2C_RTC_DATA_S  16
+
+#define I2C_RTC_ADDR 0x000000FF
+#define I2C_RTC_ADDR_M  ((I2C_RTC_ADDR_V)<<(I2C_RTC_ADDR_S))
+#define I2C_RTC_ADDR_V  0xFF
+#define I2C_RTC_ADDR_S  8
+
+#define I2C_RTC_SLAVE_ID 0x000000FF
+#define I2C_RTC_SLAVE_ID_M  ((I2C_RTC_SLAVE_ID_V)<<(I2C_RTC_SLAVE_ID_S))
+#define I2C_RTC_SLAVE_ID_V  0xFF
+#define I2C_RTC_SLAVE_ID_S  0
+
+#define I2C_RTC_MAGIC_DEFAULT (0x1c40)
+
+static void i2c_rtc_enable_block(uint8_t block)
+{
+    REG_SET_FIELD(I2C_RTC_CONFIG0, I2C_RTC_MAGIC_CTRL, I2C_RTC_MAGIC_DEFAULT);
+    REG_SET_FIELD(I2C_RTC_CONFIG1, I2C_RTC_ALL_MASK, I2C_RTC_ALL_MASK_V);
+    REG_SET_BIT(I2C_RTC_WIFI_CLK_EN, I2C_RTC_CLK_GATE_EN);
+    switch (block) {
+    case I2C_APLL:
+        REG_CLR_BIT(I2C_RTC_CONFIG1, I2C_RTC_APLL_MASK);
+        break;
+    case I2C_BBPLL:
+        REG_CLR_BIT(I2C_RTC_CONFIG1, I2C_RTC_BBPLL_MASK);
+        break;
+    case I2C_SAR_ADC:
+        REG_CLR_BIT(I2C_RTC_CONFIG1, I2C_RTC_SAR_MASK);
+        break;
+    case I2C_BOD:
+        REG_CLR_BIT(I2C_RTC_CONFIG1, I2C_RTC_BOD_MASK);
+        break;
+    }
+}
+
+uint8_t i2c_rtc_read_reg(uint8_t block, uint8_t host_id, uint8_t reg_add)
+{
+    i2c_rtc_enable_block(block);
+
+    uint32_t temp = ((block & I2C_RTC_SLAVE_ID_V) << I2C_RTC_SLAVE_ID_S)
+                    | (reg_add & I2C_RTC_ADDR_V) << I2C_RTC_ADDR_S;
+    REG_WRITE(I2C_RTC_CONFIG2, temp);
+    while (REG_GET_BIT(I2C_RTC_CONFIG2, I2C_RTC_BUSY));
+    return REG_GET_FIELD(I2C_RTC_CONFIG2, I2C_RTC_DATA);
+}
+
+uint8_t i2c_rtc_read_reg_mask(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb)
+{
+    assert(msb - lsb < 8);
+    i2c_rtc_enable_block(block);
+
+    uint32_t temp = ((block & I2C_RTC_SLAVE_ID_V) << I2C_RTC_SLAVE_ID_S)
+                    | (reg_add & I2C_RTC_ADDR_V) << I2C_RTC_ADDR_S;
+    REG_WRITE(I2C_RTC_CONFIG2, temp);
+    while (REG_GET_BIT(I2C_RTC_CONFIG2, I2C_RTC_BUSY));
+    uint32_t data = REG_GET_FIELD(I2C_RTC_CONFIG2, I2C_RTC_DATA);
+    return (uint8_t)((data >> lsb) & (~(0xFFFFFFFF << (msb - lsb + 1))));
+}
+
+void i2c_rtc_write_reg(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t data)
+{
+    i2c_rtc_enable_block(block);
+
+    uint32_t temp = ((block & I2C_RTC_SLAVE_ID_V) << I2C_RTC_SLAVE_ID_S)
+                    | ((reg_add & I2C_RTC_ADDR_V) << I2C_RTC_ADDR_S)
+                    | ((0x1 & I2C_RTC_WR_CNTL_V) << I2C_RTC_WR_CNTL_S)
+                    | (((uint32_t)data & I2C_RTC_DATA_V) << I2C_RTC_DATA_S);
+    REG_WRITE(I2C_RTC_CONFIG2, temp);
+    while (REG_GET_BIT(I2C_RTC_CONFIG2, I2C_RTC_BUSY));
+}
+
+void i2c_rtc_write_reg_mask(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb, uint8_t data)
+{
+    assert(msb - lsb < 8);
+    i2c_rtc_enable_block(block);
+
+    /*Read the i2c bus register*/
+    uint32_t temp = ((block & I2C_RTC_SLAVE_ID_V) << I2C_RTC_SLAVE_ID_S)
+                    | (reg_add & I2C_RTC_ADDR_V) << I2C_RTC_ADDR_S;
+    REG_WRITE(I2C_RTC_CONFIG2, temp);
+    while (REG_GET_BIT(I2C_RTC_CONFIG2, I2C_RTC_BUSY));
+    temp = REG_GET_FIELD(I2C_RTC_CONFIG2, I2C_RTC_DATA);
+    /*Write the i2c bus register*/
+    temp &= ((~(0xFFFFFFFF << lsb)) | (0xFFFFFFFF << (msb + 1)));
+    temp = (((uint32_t)data & (~(0xFFFFFFFF << (msb - lsb + 1)))) << lsb) | temp;
+    temp = ((block & I2C_RTC_SLAVE_ID_V) << I2C_RTC_SLAVE_ID_S)
+            | ((reg_add & I2C_RTC_ADDR_V) << I2C_RTC_ADDR_S)
+            | ((0x1 & I2C_RTC_WR_CNTL_V) << I2C_RTC_WR_CNTL_S)
+            | ((temp & I2C_RTC_DATA_V) << I2C_RTC_DATA_S);
+    REG_WRITE(I2C_RTC_CONFIG2, temp);
+    while (REG_GET_BIT(I2C_RTC_CONFIG2, I2C_RTC_BUSY));
+}

components/soc/src/esp32s2/i2c_rtc_clk.h

@@ -17,6 +17,7 @@
 #include "i2c_apll.h"
 #include "i2c_bbpll.h"
 #include "i2c_ulp.h"
+#include "i2c_saradc.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -31,26 +32,27 @@ extern "C" {
 /* Clear to enable BBPLL */
 #define I2C_BBPLL_M     (BIT(17))
 
-/* ROM functions which read/write internal control bus */
+/* Read/Write internal control bus */
-uint8_t rom_i2c_readReg(uint8_t block, uint8_t host_id, uint8_t reg_add);
+uint8_t i2c_rtc_read_reg(uint8_t block, uint8_t host_id, uint8_t reg_add);
-uint8_t rom_i2c_readReg_Mask(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb);
+uint8_t i2c_rtc_read_reg_mask(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb);
-void rom_i2c_writeReg(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t data);
+void i2c_rtc_write_reg(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t data);
-void rom_i2c_writeReg_Mask(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb, uint8_t data);
+void i2c_rtc_write_reg_mask(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb, uint8_t data);
+void i2c_rtc_init(void);
 
 /* Convenience macros for the above functions, these use register definitions
  * from i2c_apll.h/i2c_bbpll.h header files.
  */
 #define I2C_WRITEREG_MASK_RTC(block, reg_add, indata) \
-      rom_i2c_writeReg_Mask(block, block##_HOSTID,  reg_add,  reg_add##_MSB,  reg_add##_LSB,  indata)
+      i2c_rtc_write_reg_mask(block, block##_HOSTID,  reg_add,  reg_add##_MSB,  reg_add##_LSB,  indata)
 
 #define I2C_READREG_MASK_RTC(block, reg_add) \
-      rom_i2c_readReg_Mask(block, block##_HOSTID,  reg_add,  reg_add##_MSB,  reg_add##_LSB)
+      i2c_rtc_read_reg_mask(block, block##_HOSTID,  reg_add,  reg_add##_MSB,  reg_add##_LSB)
 
 #define I2C_WRITEREG_RTC(block, reg_add, indata) \
-      rom_i2c_writeReg(block, block##_HOSTID,  reg_add, indata)
+      i2c_rtc_write_reg(block, block##_HOSTID,  reg_add, indata)
 
 #define I2C_READREG_RTC(block, reg_add) \
-      rom_i2c_readReg(block, block##_HOSTID,  reg_add)
+      i2c_rtc_read_reg(block, block##_HOSTID,  reg_add)
 
 #ifdef __cplusplus
 }

components/soc/src/esp32s2/rtc_clk.c

@@ -289,6 +289,7 @@ void rtc_clk_bbpll_configure(rtc_xtal_freq_t xtal_freq, int pll_freq)
             abort();
         }
     }
+
     s_cur_pll_freq = pll_freq;
 }