[Core] Add support for RISC-V builds and GD32VF103 MCU (#12508)

* Add support for RISC-V builds and GD32VF103 MCU

* Add toolchain selection in chibios.mk based on the mcu selected in
mcu_selection.mk
* Reorder and added comments to chibios.mk to have a streamlined makefile
* Add GD32VF103 mcu to possible targets for QMK.
* Add STM32 compatibility for GD32VF103 MCU, this is hacky but more efficent
  then rewriting every driver.
* Add GigaDevice DFU bootloader as flash target, please note that
  dfu-util of at least version 0.10 is needed.
* Add analog driver compatibility
* Add apa102 bitbang driver compatibility
* Add ws2812 bitbang driver compatibility
* Add eeprom in flash emulation compatibility
* Allow faster re-builds with ccache

* Add SiPeed Longan Nano to platform files

* Add SiPeed Longan Nano Onekeys

* Make quine compatible with other bootloaders

* Support builds with picolibc

* Add risc-v toolchain to arch and debian/ubuntu scripts

2 files changed, 6 insertions, 6 deletions

diff --git a/platforms/chibios/drivers/analog.c b/platforms/chibios/drivers/analog.c
index 8c476fcac2..eb437665f1 100644
--- a/platforms/chibios/drivers/analog.c
+++ b/platforms/chibios/drivers/analog.c
@@ -38,7 +38,7 @@
 // Otherwise assume V3
 #if defined(STM32F0XX) || defined(STM32L0XX)
 #    define USE_ADCV1
-#elif defined(STM32F1XX) || defined(STM32F2XX) || defined(STM32F4XX)
+#elif defined(STM32F1XX) || defined(STM32F2XX) || defined(STM32F4XX) || defined(GD32VF103)
 #    define USE_ADCV2
 #endif
 
@@ -75,7 +75,7 @@
 
 /* User configurable ADC options */
 #ifndef ADC_COUNT
-#    if defined(STM32F0XX) || defined(STM32F1XX) || defined(STM32F4XX)
+#    if defined(STM32F0XX) || defined(STM32F1XX) || defined(STM32F4XX) || defined(GD32VF103)
 #        define ADC_COUNT 1
 #    elif defined(STM32F3XX)
 #        define ADC_COUNT 4
@@ -122,8 +122,8 @@ static ADCConversionGroup adcConversionGroup = {
     .cfgr1 = ADC_CFGR1_CONT | ADC_RESOLUTION,
     .smpr  = ADC_SAMPLING_RATE,
 #elif defined(USE_ADCV2)
-#    if !defined(STM32F1XX)
-    .cr2 = ADC_CR2_SWSTART,  // F103 seem very unhappy with, F401 seems very unhappy without...
+#    if !defined(STM32F1XX) && !defined(GD32VF103)
+    .cr2   = ADC_CR2_SWSTART,  // F103 seem very unhappy with, F401 seems very unhappy without...
 #    endif
     .smpr2 = ADC_SMPR2_SMP_AN0(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN1(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN2(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN3(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN4(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN5(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN6(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN7(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN8(ADC_SAMPLING_RATE) | ADC_SMPR2_SMP_AN9(ADC_SAMPLING_RATE),
     .smpr1 = ADC_SMPR1_SMP_AN10(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN11(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN12(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN13(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN14(ADC_SAMPLING_RATE) | ADC_SMPR1_SMP_AN15(ADC_SAMPLING_RATE),
@@ -220,7 +220,7 @@ __attribute__((weak)) adc_mux pinToMux(pin_t pin) {
         case F9:  return TO_MUX( ADC_CHANNEL_IN7,  2 );
         case F10: return TO_MUX( ADC_CHANNEL_IN8,  2 );
 #    endif
-#elif defined(STM32F1XX)
+#elif defined(STM32F1XX) || defined(GD32VF103)
         case A0:  return TO_MUX( ADC_CHANNEL_IN0,  0 );
         case A1:  return TO_MUX( ADC_CHANNEL_IN1,  0 );
         case A2:  return TO_MUX( ADC_CHANNEL_IN2,  0 );
diff --git a/platforms/chibios/drivers/ws2812.c b/platforms/chibios/drivers/ws2812.c
index ffcdcff242..b46c46ae57 100644
--- a/platforms/chibios/drivers/ws2812.c
+++ b/platforms/chibios/drivers/ws2812.c
@@ -6,7 +6,7 @@
 /* Adapted from https://github.com/bigjosh/SimpleNeoPixelDemo/ */
 
 #ifndef NOP_FUDGE
-#    if defined(STM32F0XX) || defined(STM32F1XX) || defined(STM32F3XX) || defined(STM32F4XX) || defined(STM32L0XX)
+#    if defined(STM32F0XX) || defined(STM32F1XX) || defined(GD32VF103) || defined(STM32F3XX) || defined(STM32F4XX) || defined(STM32L0XX)
 #        define NOP_FUDGE 0.4
 #    else
 #        error("NOP_FUDGE configuration required")