hal: add flash hal api

Add a flash api with functions to erase and program. The api also
includes functions to query flash start, flash size, page size and
sector size.

hal/flash_api.h

@@ -0,0 +1,119 @@
+/** \addtogroup hal */
+/** @{*/
+
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ *
+ * 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 MBED_FLASH_API_H
+#define MBED_FLASH_API_H
+
+#include "device.h"
+#include <stdint.h>
+
+#if DEVICE_FLASH
+
+#define MBED_FLASH_INVALID_SIZE     0xFFFFFFFF
+
+typedef struct flash_s flash_t;
+
+#if TARGET_FLASH_CMSIS_ALGO
+#include "flash_data.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \defgroup flash_hal Flash HAL API
+ * @{
+ */
+
+/** Initialize the flash peripheral and the flash_t object
+ * 
+ * @param obj The flash object
+ * @return 0 for success, -1 for error
+ */
+int32_t flash_init(flash_t *obj);
+
+/** Uninitialize the flash peripheral and the flash_t object
+ * 
+ * @param obj The flash object
+ * @return 0 for success, -1 for error
+ */
+int32_t flash_free(flash_t *obj);
+
+/** Erase one sector starting at defined address
+ *
+ * The address should be at sector boundary. This function does not do any check for address alignments
+ * @param obj The flash object
+ * @param address The sector starting address
+ * @return 0 for success, -1 for error
+ */
+int32_t flash_erase_sector(flash_t *obj, uint32_t address);
+
+/** Program one page starting at defined address
+ * 
+ * The page should be at page boundary, should not cross multiple sectors. 
+ * This function does not do any check for address alignments or if size is aligned to a page size.
+ * @param obj The flash object
+ * @param address The sector starting address
+ * @param data The data buffer to be programmed
+ * @param size The number of bytes to program
+ * @return 0 for success, -1 for error
+ */
+int32_t flash_program_page(flash_t *obj, uint32_t address, const uint8_t *data, uint32_t size);
+
+/** Get sector size
+ * 
+ * @param obj The flash object
+ * @param address The sector starting address
+ * @return The size of a sector
+ */
+uint32_t flash_get_sector_size(const flash_t *obj, uint32_t address);
+
+/** Get page size
+ * 
+ * @param obj The flash object
+ * @param address The page starting address
+ * @return The size of a page
+ */
+uint32_t flash_get_page_size(const flash_t *obj);
+
+/** Get start address for the flash region
+ * 
+ * @param obj The flash object
+ * @return The start address for the flash region
+ */
+uint32_t flash_get_start_address(const flash_t *obj);
+
+/** Get the flash region size
+ * 
+ * @param obj The flash object
+ * @return The flash region size
+ */
+uint32_t flash_get_size(const flash_t *obj);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#endif
+
+/** @}*/