Import of the watch repository from Pebble

src/fw/drivers/qspi_definitions.h

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+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include "board/board.h"
+
+#include "freertos_types.h"
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#define QSPI_NUM_DATA_PINS (4)
+
+typedef struct QSPIPortState {
+  SemaphoreHandle_t dma_semaphore;
+  int use_count;
+} QSPIPortState;
+
+typedef const struct QSPIPort {
+  QSPIPortState *state;
+  uint32_t clock_speed_hz;
+  uint16_t auto_polling_interval;
+  uint32_t clock_ctrl;
+  AfConfig cs_gpio;
+  AfConfig clk_gpio;
+  AfConfig data_gpio[QSPI_NUM_DATA_PINS];
+  DMARequest *dma;
+} QSPIPort;
+
+//! Initialize the QSPI peripheral, the pins, and the DMA
+void qspi_init(QSPIPort *dev, uint32_t flash_size);