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feat(esp32c5): add rng support for bootloader and app

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hongshuqing
2024-07-16 15:09:33 +08:00
parent 40034622b8
commit 1454be7d4e
6 changed files with 149 additions and 33 deletions
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91
components/bootloader_support/src/bootloader_random_esp32c5.c
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@@ -3,20 +3,103 @@
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "sdkconfig.h"
#include "bootloader_random.h"
#include "soc/soc.h"
#include "soc/pcr_reg.h"
#include "soc/apb_saradc_reg.h"
#include "soc/pmu_reg.h"
#include "hal/regi2c_ctrl.h"
#include "soc/lpperi_reg.h"
#include "soc/regi2c_saradc.h"
#include "esp_log.h"
static const uint32_t SAR2_CHANNEL = 9;
static const uint32_t SAR1_CHANNEL = 7;
static const uint32_t PATTERN_BIT_WIDTH = 6;
static const uint32_t SAR1_ATTEN = 3;
static const uint32_t SAR2_ATTEN = 3;
void bootloader_random_enable(void)
{
// TODO: [ESP32C5] IDF-8626
ESP_EARLY_LOGW("bootloader_random", "bootloader_random_enable() has not been implemented on C5 yet");
// pull SAR ADC out of reset
REG_SET_BIT(PCR_SARADC_CONF_REG, PCR_SARADC_RST_EN);
REG_CLR_BIT(PCR_SARADC_CONF_REG, PCR_SARADC_RST_EN);
// enable SAR ADC APB clock
REG_SET_BIT(PCR_SARADC_CONF_REG, PCR_SARADC_REG_CLK_EN);
// pull APB register out of reset
REG_SET_BIT(PCR_SARADC_CONF_REG, PCR_SARADC_REG_RST_EN);
REG_CLR_BIT(PCR_SARADC_CONF_REG, PCR_SARADC_REG_RST_EN);
// enable ADC_CTRL_CLK (SAR ADC function clock)
REG_SET_BIT(PCR_SARADC_CLKM_CONF_REG, PCR_SARADC_CLKM_EN);
// select XTAL clock (40 MHz) source for ADC_CTRL_CLK
REG_SET_FIELD(PCR_SARADC_CLKM_CONF_REG, PCR_SARADC_CLKM_SEL, 0); // 0: XTAL; 1: 80M(from bbpll); 2. FOSC
// set the clock divider for ADC_CTRL_CLK to default value (in case it has been changed)
REG_SET_FIELD(PCR_SARADC_CLKM_CONF_REG, PCR_SARADC_CLKM_DIV_NUM, 0);
// some magic register poke from the digital team
SET_PERI_REG_MASK(PMU_RF_PWC_REG, PMU_PERIF_I2C_RSTB);
SET_PERI_REG_MASK(PMU_RF_PWC_REG, PMU_XPD_PERIF_I2C);
// Config ADC circuit (Analog part) with I2C (HOST ID 0X69) and choose internal voltage as sampling source
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC_DTEST_RTC_ADDR, 0);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC_ENT_PERIF_ADDR, 1);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC1_EN_TOUT_ADDR, 1);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC2_EN_TOUT_ADDR, 1);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SAR2_INITIAL_CODE_HIGH_ADDR, 0x08);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SAR2_INITIAL_CODE_LOW_ADDR, 0x66);
REGI2C_WRITE_MASK(I2C_SAR_ADC, I2C_SAR_ADC_SAR1_INIT_CODE_MSB, 0x08);
REGI2C_WRITE_MASK(I2C_SAR_ADC, I2C_SAR_ADC_SAR1_INIT_CODE_LSB, 0x66);
// create patterns and set them in pattern table
uint32_t pattern_one = (SAR2_CHANNEL << 2) | SAR2_ATTEN; // we want channel 9 with max attenuation
uint32_t pattern_two = (SAR1_CHANNEL << 2) | SAR1_ATTEN; // we want channel 7 with max attenuation
uint32_t pattern_table = 0 | (pattern_two << 3 * PATTERN_BIT_WIDTH) | pattern_one << 2 * PATTERN_BIT_WIDTH;
REG_WRITE(APB_SARADC_SAR_PATT_TAB1_REG, pattern_table);
// set pattern length (APB_SARADC_SARADC_SAR_PATT_LEN counts from 0)
REG_SET_FIELD(APB_SARADC_CTRL_REG, APB_SARADC_SARADC_SAR_PATT_LEN, 1);
REG_SET_FIELD(APB_SARADC_CTRL_REG, APB_SARADC_SARADC_SAR_CLK_DIV, 15);
// set timer expiry (timer is ADC_CTRL_CLK)
REG_SET_FIELD(APB_SARADC_CTRL2_REG, APB_SARADC_SARADC_TIMER_TARGET, 200);
// enable timer
REG_SET_BIT(APB_SARADC_CTRL2_REG, APB_SARADC_SARADC_TIMER_EN);
CLEAR_PERI_REG_MASK(LPPERI_RNG_CFG_REG, LPPERI_RNG_TIMER_EN);
}
void bootloader_random_disable(void)
{
// TODO: [ESP32C5] IDF-8626
ESP_EARLY_LOGW("bootloader_random", "bootloader_random_disable() has not been implemented on C5 yet");
// disable timer
REG_CLR_BIT(APB_SARADC_CTRL2_REG, APB_SARADC_SARADC_TIMER_EN);
// Write reset value of this register
REG_WRITE(APB_SARADC_SAR_PATT_TAB1_REG, 0xFFFFFF);
// Revert ADC I2C configuration and initial voltage source setting
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SAR2_INITIAL_CODE_HIGH_ADDR, 0x60);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SAR2_INITIAL_CODE_LOW_ADDR, 0x0);
REGI2C_WRITE_MASK(I2C_SAR_ADC, I2C_SAR_ADC_SAR1_INIT_CODE_MSB, 0x60);
REGI2C_WRITE_MASK(I2C_SAR_ADC, I2C_SAR_ADC_SAR1_INIT_CODE_LSB, 0x0);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC_DTEST_RTC_ADDR, 0);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC_ENT_PERIF_ADDR, 0);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC1_EN_TOUT_ADDR, 0);
REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC2_EN_TOUT_ADDR, 0);
// Revert PMU_RF_PWC_REG to it's initial value
CLEAR_PERI_REG_MASK(PMU_RF_PWC_REG, PMU_PERIF_I2C_RSTB);
// disable ADC_CTRL_CLK (SAR ADC function clock)
REG_WRITE(PCR_SARADC_CLKM_CONF_REG, 0x00404000);
// Set PCR_SARADC_CONF_REG to initial state
REG_WRITE(PCR_SARADC_CONF_REG, 0x5);
}