[Core] Add Raspberry Pi RP2040 support (#14877)

* Disable RESET keycode because of naming conflicts

* Add Pico SDK as submodule

* Add RP2040 build support to QMK

* Adjust USB endpoint structs for RP2040

* Add RP2040 bootloader and double-tap reset routine

* Add generic and pro micro RP2040 boards

* Add RP2040 onekey keyboard

* Add WS2812 PIO DMA enabled driver and documentation

Supports regular and open-drain output configuration. RP2040 GPIOs are
sadly not 5V tolerant, so this is a bit use-less or needs extra hardware
or you take the risk to fry your hardware.

* Adjust SIO Driver for RP2040

* Adjust I2C Driver for RP2040

* Adjust SPI Driver for RP2040

* Add PIO serial driver and documentation

* Add general RP2040 documentation

* Apply suggestions from code review

Co-authored-by: Nick Brassel <nick@tzarc.org>

Co-authored-by: Nick Brassel <nick@tzarc.org>

4 files changed, 132 insertions, 0 deletions

diff --git a/platforms/chibios/boards/GENERIC_RP_RP2040/board/board.mk b/platforms/chibios/boards/GENERIC_RP_RP2040/board/board.mk
new file mode 100644
index 0000000000..911cc5a058
--- /dev/null
+++ b/platforms/chibios/boards/GENERIC_RP_RP2040/board/board.mk
@@ -0,0 +1,9 @@
+# List of all the board related files.
+BOARDSRC = $(CHIBIOS)/os/hal/boards/RP_PICO_RP2040/board.c
+
+# Required include directories
+BOARDINC = $(CHIBIOS)/os/hal/boards/RP_PICO_RP2040
+
+# Shared variables
+ALLCSRC += $(BOARDSRC) 
+ALLINC  += $(BOARDINC)
diff --git a/platforms/chibios/boards/GENERIC_RP_RP2040/configs/board.h b/platforms/chibios/boards/GENERIC_RP_RP2040/configs/board.h
new file mode 100644
index 0000000000..052050c944
--- /dev/null
+++ b/platforms/chibios/boards/GENERIC_RP_RP2040/configs/board.h
@@ -0,0 +1,12 @@
+// Copyright 2022 Stefan Kerkmann
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include_next "board.h"
+
+#undef BOARD_RP_PICO_RP2040
+#define BOARD_GENERIC_RP2040
+
+#undef BOARD_NAME
+#define BOARD_NAME "Generic Raspberry Pi RP2040"
diff --git a/platforms/chibios/boards/GENERIC_RP_RP2040/configs/chconf.h b/platforms/chibios/boards/GENERIC_RP_RP2040/configs/chconf.h
new file mode 100644
index 0000000000..d53f57edd9
--- /dev/null
+++ b/platforms/chibios/boards/GENERIC_RP_RP2040/configs/chconf.h
@@ -0,0 +1,13 @@
+// Copyright 2022 Stefan Kerkmann
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#define CH_CFG_SMP_MODE                     TRUE
+#define CH_CFG_ST_RESOLUTION                32
+#define CH_CFG_ST_FREQUENCY                 1000000
+#define CH_CFG_INTERVALS_SIZE               32
+#define CH_CFG_TIME_TYPES_SIZE              32
+#define CH_CFG_ST_TIMEDELTA                 20
+
+#include_next <chconf.h>
diff --git a/platforms/chibios/boards/GENERIC_RP_RP2040/configs/mcuconf.h b/platforms/chibios/boards/GENERIC_RP_RP2040/configs/mcuconf.h
new file mode 100644
index 0000000000..9d8dc61aac
--- /dev/null
+++ b/platforms/chibios/boards/GENERIC_RP_RP2040/configs/mcuconf.h
@@ -0,0 +1,98 @@
+/*
+    ChibiOS - Copyright (C) 2006..2021 Giovanni Di Sirio
+
+    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.
+*/
+
+#ifndef MCUCONF_H
+#define MCUCONF_H
+
+/*
+ * RP2040_MCUCONF drivers configuration.
+ *
+ * IRQ priorities:
+ * 3...0        Lowest...Highest.
+ *
+ * DMA priorities:
+ * 0...1        Lowest...Highest.
+ */
+
+#define RP2040_MCUCONF
+
+/*
+ * HAL driver system settings.
+ */
+#define RP_NO_INIT                          FALSE
+#define RP_CORE1_START                      FALSE
+#define RP_CORE1_VECTORS_TABLE              _vectors
+#define RP_CORE1_ENTRY_POINT                _crt0_c1_entry
+#define RP_CORE1_STACK_END                  __c1_main_stack_end__
+
+/*
+ * IRQ system settings.
+ */
+#define RP_IRQ_SYSTICK_PRIORITY             2
+#define RP_IRQ_TIMER_ALARM0_PRIORITY        2
+#define RP_IRQ_TIMER_ALARM1_PRIORITY        2
+#define RP_IRQ_TIMER_ALARM2_PRIORITY        2
+#define RP_IRQ_TIMER_ALARM3_PRIORITY        2
+#define RP_IRQ_UART0_PRIORITY               3
+#define RP_IRQ_UART1_PRIORITY               3
+#define RP_IRQ_SPI0_PRIORITY                2
+#define RP_IRQ_SPI1_PRIORITY                2
+#define RP_IRQ_USB0_PRIORITY                3
+#define RP_IRQ_I2C0_PRIORITY                2
+#define RP_IRQ_I2C1_PRIORITY                2
+
+/*
+ * ADC driver system settings.
+ */
+#define RP_ADC_USE_ADC1                     FALSE
+
+/*
+ * SIO driver system settings.
+ */
+#define RP_SIO_USE_UART0                    FALSE
+#define RP_SIO_USE_UART1                    FALSE
+
+/*
+ * SPI driver system settings.
+ */
+#define RP_SPI_USE_SPI0                     FALSE
+#define RP_SPI_USE_SPI1                     FALSE
+#define RP_SPI_SPI0_RX_DMA_CHANNEL          RP_DMA_CHANNEL_ID_ANY
+#define RP_SPI_SPI0_TX_DMA_CHANNEL          RP_DMA_CHANNEL_ID_ANY
+#define RP_SPI_SPI1_RX_DMA_CHANNEL          RP_DMA_CHANNEL_ID_ANY
+#define RP_SPI_SPI1_TX_DMA_CHANNEL          RP_DMA_CHANNEL_ID_ANY
+#define RP_SPI_SPI0_DMA_PRIORITY            1
+#define RP_SPI_SPI1_DMA_PRIORITY            1
+#define RP_SPI_DMA_ERROR_HOOK(spip)
+
+/*
+ * I2C driver system settings.
+ */
+#define RP_I2C_USE_I2C0                     FALSE
+#define RP_I2C_USE_I2C1                     FALSE
+#define RP_I2C_BUSY_TIMEOUT                 50
+#define RP_I2C_ADDRESS_MODE_10BIT           FALSE
+
+/*
+ * USB driver system settings.
+ */
+#define RP_USB_USE_USBD0                    TRUE
+#define RP_USB_FORCE_VBUS_DETECT            TRUE
+#define RP_USE_EXTERNAL_VBUS_DETECT         FALSE
+#define RP_USB_USE_SOF_INTR                 TRUE
+#define RP_USB_USE_ERROR_DATA_SEQ_INTR      FALSE
+
+#endif /* MCUCONF_H */