add circuitpython code

1 files changed, 263 insertions, 0 deletions

diff --git a/circuitpython/ports/raspberrypi/supervisor/port.c b/circuitpython/ports/raspberrypi/supervisor/port.c
new file mode 100644
index 0000000..5041250
--- /dev/null
+++ b/circuitpython/ports/raspberrypi/supervisor/port.c
@@ -0,0 +1,263 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "supervisor/background_callback.h"
+#include "supervisor/board.h"
+#include "supervisor/port.h"
+
+#include "bindings/rp2pio/StateMachine.h"
+#include "genhdr/mpversion.h"
+#include "shared-bindings/audiopwmio/PWMAudioOut.h"
+#include "shared-bindings/busio/I2C.h"
+#include "shared-bindings/busio/SPI.h"
+#include "shared-bindings/countio/Counter.h"
+#include "shared-bindings/microcontroller/__init__.h"
+#include "shared-bindings/rtc/__init__.h"
+#include "shared-bindings/pwmio/PWMOut.h"
+
+#include "common-hal/rtc/RTC.h"
+#include "common-hal/busio/UART.h"
+
+#include "supervisor/shared/safe_mode.h"
+#include "supervisor/shared/stack.h"
+#include "supervisor/shared/tick.h"
+
+#include "src/rp2040/hardware_structs/include/hardware/structs/watchdog.h"
+#include "src/rp2_common/hardware_gpio/include/hardware/gpio.h"
+#include "src/rp2_common/hardware_uart/include/hardware/uart.h"
+#include "src/rp2_common/hardware_sync/include/hardware/sync.h"
+#include "src/rp2_common/hardware_timer/include/hardware/timer.h"
+#include "src/common/pico_time/include/pico/time.h"
+#include "src/common/pico_binary_info/include/pico/binary_info.h"
+
+#include "pico/bootrom.h"
+#include "hardware/watchdog.h"
+
+extern volatile bool mp_msc_enabled;
+
+STATIC void _tick_callback(uint alarm_num);
+
+STATIC void _binary_info(void) {
+    // Binary info readable with `picotool`.
+    bi_decl(bi_program_name("CircuitPython"));
+    bi_decl(bi_program_version_string(MICROPY_GIT_TAG));
+    bi_decl(bi_program_build_date_string(MICROPY_BUILD_DATE));
+    bi_decl(bi_program_url("https://circuitpython.org"));
+
+    bi_decl(bi_program_build_attribute("BOARD=" CIRCUITPY_BOARD_ID));
+    // TODO: Add build attribute for debug builds. Needs newer CircuitPython with CIRCUITPY_DEBUG.
+}
+
+extern uint32_t _ld_dtcm_bss_start;
+extern uint32_t _ld_dtcm_bss_size;
+extern uint32_t _ld_dtcm_data_destination;
+extern uint32_t _ld_dtcm_data_size;
+extern uint32_t _ld_dtcm_data_flash_copy;
+extern uint32_t _ld_itcm_destination;
+extern uint32_t _ld_itcm_size;
+extern uint32_t _ld_itcm_flash_copy;
+
+safe_mode_t port_init(void) {
+    _binary_info();
+    // Set brown out.
+
+    // Copy all of the "tightly coupled memory" code and data to run from RAM.
+    // This lets us use the 16k cache for dynamically used data and code.
+    // We must do this before we try and call any of its code or load the data.
+    for (uint32_t i = 0; i < ((size_t)&_ld_itcm_size) / 4; i++) {
+        (&_ld_itcm_destination)[i] = (&_ld_itcm_flash_copy)[i];
+        // Now zero it out to evict the line from the XIP cache. Without this,
+        // it'll stay in the XIP cache anyway.
+        (&_ld_itcm_flash_copy)[i] = 0x0;
+    }
+
+    // Copy all of the data to run from DTCM.
+    for (uint32_t i = 0; i < ((size_t)&_ld_dtcm_data_size) / 4; i++) {
+        (&_ld_dtcm_data_destination)[i] = (&_ld_dtcm_data_flash_copy)[i];
+        // Now zero it out to evict the line from the XIP cache. Without this,
+        // it'll stay in the XIP cache anyway.
+        (&_ld_dtcm_data_flash_copy)[i] = 0x0;
+    }
+
+    // Clear DTCM bss.
+    for (uint32_t i = 0; i < ((size_t)&_ld_dtcm_bss_size) / 4; i++) {
+        (&_ld_dtcm_bss_start)[i] = 0;
+    }
+
+    // Reset everything into a known state before board_init.
+    reset_port();
+
+    // Initialize RTC
+    common_hal_rtc_init();
+
+    // For the tick.
+    hardware_alarm_claim(0);
+    hardware_alarm_set_callback(0, _tick_callback);
+
+    // Check brownout.
+
+    if (board_requests_safe_mode()) {
+        return USER_SAFE_MODE;
+    }
+
+    return NO_SAFE_MODE;
+}
+
+void reset_port(void) {
+    #if CIRCUITPY_BUSIO
+    reset_i2c();
+    reset_spi();
+    reset_uart();
+    #endif
+
+    #if CIRCUITPY_COUNTIO
+    reset_countio();
+    #endif
+
+    #if CIRCUITPY_PWMIO
+    pwmout_reset();
+    #endif
+
+    #if CIRCUITPY_RP2PIO
+    reset_rp2pio_statemachine();
+    #endif
+
+    #if CIRCUITPY_RTC
+    rtc_reset();
+    #endif
+
+    #if CIRCUITPY_AUDIOPWMIO
+    audiopwmout_reset();
+    #endif
+    #if CIRCUITPY_AUDIOCORE
+    audio_dma_reset();
+    #endif
+
+    reset_all_pins();
+}
+
+void reset_to_bootloader(void) {
+    reset_usb_boot(0, 0);
+    while (true) {
+    }
+}
+
+void reset_cpu(void) {
+    watchdog_reboot(0, SRAM_END, 0);
+    watchdog_start_tick(12);
+
+    while (true) {
+        __wfi();
+    }
+}
+
+bool port_has_fixed_stack(void) {
+    return false;
+}
+
+// From the linker script
+extern uint32_t __HeapLimit;
+extern uint32_t __StackTop;
+uint32_t *port_stack_get_limit(void) {
+    return &__HeapLimit;
+}
+
+uint32_t *port_stack_get_top(void) {
+    return &__StackTop;
+}
+
+uint32_t *port_heap_get_bottom(void) {
+    return port_stack_get_limit();
+}
+
+uint32_t *port_heap_get_top(void) {
+    return port_stack_get_top();
+}
+
+extern uint32_t __scratch_x_start__;
+void port_set_saved_word(uint32_t value) {
+    __scratch_x_start__ = value;
+}
+
+uint32_t port_get_saved_word(void) {
+    return __scratch_x_start__;
+}
+
+uint64_t port_get_raw_ticks(uint8_t *subticks) {
+    uint64_t microseconds = time_us_64();
+    return 1024 * (microseconds / 1000000) + (microseconds % 1000000) / 977;
+}
+
+STATIC void _tick_callback(uint alarm_num) {
+    supervisor_tick();
+    hardware_alarm_set_target(0, delayed_by_us(get_absolute_time(), 977));
+}
+
+// Enable 1/1024 second tick.
+void port_enable_tick(void) {
+    hardware_alarm_set_target(0, delayed_by_us(get_absolute_time(), 977));
+}
+
+// Disable 1/1024 second tick.
+void port_disable_tick(void) {
+    // hardware_alarm_cancel(0);
+}
+
+// This is called by sleep, we ignore it when our ticks are enabled because
+// they'll wake us up earlier. If we don't, we'll mess up ticks by overwriting
+// the next RTC wake up time.
+void port_interrupt_after_ticks(uint32_t ticks) {
+}
+
+void port_idle_until_interrupt(void) {
+    common_hal_mcu_disable_interrupts();
+    if (!background_callback_pending()) {
+        // TODO: Does not work when board is power-cycled.
+        // asm volatile ("dsb 0xF" ::: "memory");
+        // __wfi();
+    }
+    common_hal_mcu_enable_interrupts();
+}
+
+/**
+ * \brief Default interrupt handler for unused IRQs.
+ */
+extern void HardFault_Handler(void); // provide a prototype to avoid a missing-prototypes diagnostic
+__attribute__((used)) void HardFault_Handler(void) {
+    #ifdef ENABLE_MICRO_TRACE_BUFFER
+    // Turn off the micro trace buffer so we don't fill it up in the infinite
+    // loop below.
+    REG_MTB_MASTER = 0x00000000 + 6;
+    #endif
+
+    reset_into_safe_mode(HARD_CRASH);
+    while (true) {
+        asm ("nop;");
+    }
+}