OVMS3-idf/components/bootloader_support/src/bootloader_clock.c
Ivan Grokhotkov 490bf29767 esp32s2: fix enabling 32k XTAL clock
On the ESP32S2, rtc_clk_cal(RTC_CAL_RTC_MUX) measures the frequency
of the 90kHz RTC clock regardless of the selected slow clock
frequency. Keep track which clock is selected and pass the argument
to rtc_clk_cal accordingly.

fix clock choices

update rtc 32k xtal code for s2

missed api in rtc.h

bootloader_clock: update for S2
2020-02-17 17:33:56 +01:00

91 lines
3.1 KiB
C

// Copyright 2017 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 "sdkconfig.h"
#include "soc/soc.h"
#include "soc/rtc.h"
#include "soc/dport_reg.h"
#include "soc/efuse_periph.h"
#include "soc/rtc_cntl_reg.h"
#ifdef CONFIG_IDF_TARGET_ESP32
#include "esp32/rom/uart.h"
#include "esp32/rom/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32S2
#include "esp32s2/rom/uart.h"
#include "esp32s2/rom/rtc.h"
#endif
void bootloader_clock_configure(void)
{
// ROM bootloader may have put a lot of text into UART0 FIFO.
// Wait for it to be printed.
// This is not needed on power on reset, when ROM bootloader is running at
// 40 MHz. But in case of TG WDT reset, CPU may still be running at >80 MHZ,
// and will be done with the bootloader much earlier than UART FIFO is empty.
uart_tx_wait_idle(0);
/* Set CPU to 80MHz. Keep other clocks unmodified. */
int cpu_freq_mhz = 80;
#if CONFIG_IDF_TARGET_ESP32
/* On ESP32 rev 0, switching to 80/160 MHz if clock was previously set to
* 240 MHz may cause the chip to lock up (see section 3.5 of the errata
* document). For rev. 0, switch to 240 instead if it has been enabled
* previously.
*/
uint32_t chip_ver_reg = REG_READ(EFUSE_BLK0_RDATA3_REG);
if ((chip_ver_reg & EFUSE_RD_CHIP_VER_REV1_M) == 0 &&
DPORT_REG_GET_FIELD(DPORT_CPU_PER_CONF_REG, DPORT_CPUPERIOD_SEL) == DPORT_CPUPERIOD_SEL_240) {
cpu_freq_mhz = 240;
}
#endif
rtc_clk_config_t clk_cfg = RTC_CLK_CONFIG_DEFAULT();
#if CONFIG_IDF_TARGET_ESP32
clk_cfg.xtal_freq = CONFIG_ESP32_XTAL_FREQ;
#endif
/* ESP32-S2 doesn't have XTAL_FREQ choice, always 40MHz */
clk_cfg.cpu_freq_mhz = cpu_freq_mhz;
clk_cfg.slow_freq = rtc_clk_slow_freq_get();
clk_cfg.fast_freq = rtc_clk_fast_freq_get();
rtc_clk_init(clk_cfg);
/* As a slight optimization, if 32k XTAL was enabled in sdkconfig, we enable
* it here. Usually it needs some time to start up, so we amortize at least
* part of the start up time by enabling 32k XTAL early.
* App startup code will wait until the oscillator has started up.
*/
/* TODO: move the clock option into esp_system, so that this doesn't have
* to continue:
*/
#if CONFIG_ESP32_RTC_CLK_SRC_EXT_CRYS
if (!rtc_clk_32k_enabled()) {
rtc_clk_32k_bootstrap(CONFIG_ESP32_RTC_XTAL_BOOTSTRAP_CYCLES);
}
#endif
#if CONFIG_ESP32S2_RTC_CLK_SRC_EXT_CRYS
if (!rtc_clk_32k_enabled()) {
rtc_clk_32k_bootstrap(0);
}
#endif
}
#ifdef BOOTLOADER_BUILD
int esp_clk_apb_freq(void)
{
return rtc_clk_apb_freq_get();
}
#endif // BOOTLOADER_BUILD