220 lines
8.3 KiB
C
220 lines
8.3 KiB
C
// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdint.h>
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#include <sys/cdefs.h>
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#include <sys/time.h>
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#include "sdkconfig.h"
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#include "esp_attr.h"
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#include "esp_log.h"
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#include "esp_clk.h"
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#include "rom/ets_sys.h"
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#include "rom/uart.h"
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#include "rom/rtc.h"
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#include "soc/soc.h"
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#include "soc/rtc.h"
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#include "soc/rtc_cntl_reg.h"
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#include "soc/dport_reg.h"
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#include "soc/i2s_reg.h"
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/* Number of cycles to wait from the 32k XTAL oscillator to consider it running.
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* Larger values increase startup delay. Smaller values may cause false positive
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* detection (i.e. oscillator runs for a few cycles and then stops).
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*/
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#define XTAL_32K_DETECT_CYCLES 32
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#define SLOW_CLK_CAL_CYCLES CONFIG_ESP32_RTC_CLK_CAL_CYCLES
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static void select_rtc_slow_clk(rtc_slow_freq_t slow_clk);
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static const char* TAG = "clk";
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/*
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* This function is not exposed as an API at this point,
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* because FreeRTOS doesn't yet support dynamic changing of
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* CPU frequency. Also we need to implement hooks for
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* components which want to be notified of CPU frequency
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* changes.
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*/
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void esp_clk_init(void)
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{
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rtc_config_t cfg = RTC_CONFIG_DEFAULT();
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rtc_init(cfg);
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rtc_clk_fast_freq_set(RTC_FAST_FREQ_8M);
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#ifdef CONFIG_ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL
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select_rtc_slow_clk(RTC_SLOW_FREQ_32K_XTAL);
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#else
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select_rtc_slow_clk(RTC_SLOW_FREQ_RTC);
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#endif
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uint32_t freq_mhz = CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ;
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rtc_cpu_freq_t freq = RTC_CPU_FREQ_80M;
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switch(freq_mhz) {
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case 240:
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freq = RTC_CPU_FREQ_240M;
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break;
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case 160:
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freq = RTC_CPU_FREQ_160M;
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break;
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default:
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freq_mhz = 80;
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/* no break */
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case 80:
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freq = RTC_CPU_FREQ_80M;
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break;
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}
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// Wait for UART TX to finish, otherwise some UART output will be lost
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// when switching APB frequency
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uart_tx_wait_idle(CONFIG_CONSOLE_UART_NUM);
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rtc_clk_cpu_freq_set(freq);
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}
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void IRAM_ATTR ets_update_cpu_frequency(uint32_t ticks_per_us)
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{
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extern uint32_t g_ticks_per_us_pro; // g_ticks_us defined in ROM for PRO CPU
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extern uint32_t g_ticks_per_us_app; // same defined for APP CPU
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g_ticks_per_us_pro = ticks_per_us;
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g_ticks_per_us_app = ticks_per_us;
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}
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static void select_rtc_slow_clk(rtc_slow_freq_t slow_clk)
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{
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if (slow_clk == RTC_SLOW_FREQ_32K_XTAL) {
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/* 32k XTAL oscillator needs to be enabled and running before it can
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* be used. Hardware doesn't have a direct way of checking if the
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* oscillator is running. Here we use rtc_clk_cal function to count
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* the number of main XTAL cycles in the given number of 32k XTAL
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* oscillator cycles. If the 32k XTAL has not started up, calibration
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* will time out, returning 0.
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*/
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rtc_clk_32k_enable(true);
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uint32_t cal_val = 0;
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uint32_t wait = 0;
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// increment of 'wait' counter equivalent to 3 seconds
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const uint32_t warning_timeout = 3 /* sec */ * 32768 /* Hz */ / (2 * XTAL_32K_DETECT_CYCLES);
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ESP_EARLY_LOGD(TAG, "waiting for 32k oscillator to start up")
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do {
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++wait;
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cal_val = rtc_clk_cal(RTC_CAL_32K_XTAL, XTAL_32K_DETECT_CYCLES);
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if (wait % warning_timeout == 0) {
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ESP_EARLY_LOGW(TAG, "still waiting for 32k oscillator to start up");
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}
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} while (cal_val == 0);
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ESP_EARLY_LOGD(TAG, "32k oscillator ready, wait=%d", wait);
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}
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rtc_clk_slow_freq_set(slow_clk);
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uint32_t cal_val;
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if (SLOW_CLK_CAL_CYCLES > 0) {
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/* TODO: 32k XTAL oscillator has some frequency drift at startup.
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* Improve calibration routine to wait until the frequency is stable.
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*/
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cal_val = rtc_clk_cal(RTC_CAL_RTC_MUX, SLOW_CLK_CAL_CYCLES);
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} else {
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const uint64_t cal_dividend = (1ULL << RTC_CLK_CAL_FRACT) * 1000000ULL;
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cal_val = (uint32_t) (cal_dividend / rtc_clk_slow_freq_get_hz());
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}
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ESP_EARLY_LOGD(TAG, "RTC_SLOW_CLK calibration value: %d", cal_val);
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esp_clk_slowclk_cal_set(cal_val);
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}
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/* This function is not exposed as an API at this point.
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* All peripheral clocks are default enabled after chip is powered on.
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* This function disables some peripheral clocks when cpu starts.
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* These peripheral clocks are enabled when the peripherals are initialized
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* and disabled when they are de-initialized.
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*/
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void esp_perip_clk_init(void)
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{
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uint32_t common_perip_clk, hwcrypto_perip_clk, wifi_bt_sdio_clk = 0;
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#if CONFIG_FREERTOS_UNICORE
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RESET_REASON rst_reas[1];
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#else
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RESET_REASON rst_reas[2];
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#endif
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rst_reas[0] = rtc_get_reset_reason(0);
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#if !CONFIG_FREERTOS_UNICORE
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rst_reas[1] = rtc_get_reset_reason(1);
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#endif
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/* For reason that only reset CPU, do not disable the clocks
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* that have been enabled before reset.
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*/
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if ((rst_reas[0] >= TGWDT_CPU_RESET && rst_reas[0] <= RTCWDT_CPU_RESET)
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#if !CONFIG_FREERTOS_UNICORE
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|| (rst_reas[1] >= TGWDT_CPU_RESET && rst_reas[1] <= RTCWDT_CPU_RESET)
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#endif
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) {
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common_perip_clk = ~DPORT_READ_PERI_REG(DPORT_PERIP_CLK_EN_REG);
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hwcrypto_perip_clk = ~DPORT_READ_PERI_REG(DPORT_PERI_CLK_EN_REG);
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wifi_bt_sdio_clk = ~DPORT_READ_PERI_REG(DPORT_WIFI_CLK_EN_REG);
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}
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else {
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common_perip_clk = DPORT_WDG_CLK_EN |
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DPORT_I2S0_CLK_EN |
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DPORT_UART1_CLK_EN |
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DPORT_SPI_CLK_EN |
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DPORT_I2C_EXT0_CLK_EN |
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DPORT_UHCI0_CLK_EN |
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DPORT_RMT_CLK_EN |
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DPORT_PCNT_CLK_EN |
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DPORT_LEDC_CLK_EN |
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DPORT_UHCI1_CLK_EN |
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DPORT_TIMERGROUP1_CLK_EN |
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//80MHz SPIRAM uses SPI2 as well; it's initialized before this is called. Do not disable the clock for that if this is enabled.
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#if !CONFIG_SPIRAM_SPEED_80M
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DPORT_SPI_CLK_EN_2 |
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#endif
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DPORT_PWM0_CLK_EN |
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DPORT_I2C_EXT1_CLK_EN |
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DPORT_CAN_CLK_EN |
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DPORT_PWM1_CLK_EN |
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DPORT_I2S1_CLK_EN |
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DPORT_SPI_DMA_CLK_EN |
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DPORT_UART2_CLK_EN |
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DPORT_PWM2_CLK_EN |
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DPORT_PWM3_CLK_EN;
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hwcrypto_perip_clk = DPORT_PERI_EN_AES |
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DPORT_PERI_EN_SHA |
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DPORT_PERI_EN_RSA |
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DPORT_PERI_EN_SECUREBOOT;
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wifi_bt_sdio_clk = DPORT_WIFI_CLK_WIFI_EN |
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DPORT_WIFI_CLK_BT_EN_M |
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DPORT_WIFI_CLK_UNUSED_BIT5 |
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DPORT_WIFI_CLK_UNUSED_BIT12 |
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DPORT_WIFI_CLK_SDIOSLAVE_EN |
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DPORT_WIFI_CLK_SDIO_HOST_EN |
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DPORT_WIFI_CLK_EMAC_EN;
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}
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/* Change I2S clock to audio PLL first. Because if I2S uses 160MHz clock,
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* the current is not reduced when disable I2S clock.
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*/
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DPORT_SET_PERI_REG_MASK(I2S_CLKM_CONF_REG(0), I2S_CLKA_ENA);
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DPORT_SET_PERI_REG_MASK(I2S_CLKM_CONF_REG(1), I2S_CLKA_ENA);
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/* Disable some peripheral clocks. */
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DPORT_CLEAR_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, common_perip_clk);
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DPORT_SET_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, common_perip_clk);
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/* Disable hardware crypto clocks. */
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DPORT_CLEAR_PERI_REG_MASK(DPORT_PERI_CLK_EN_REG, hwcrypto_perip_clk);
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DPORT_SET_PERI_REG_MASK(DPORT_PERI_RST_EN_REG, hwcrypto_perip_clk);
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/* Disable WiFi/BT/SDIO clocks. */
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DPORT_CLEAR_PERI_REG_MASK(DPORT_WIFI_CLK_EN_REG, wifi_bt_sdio_clk);
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}
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