Added external spi flash driver. (#15419)

drivers/flash/flash_spi.h

@@ -0,0 +1,136 @@
+/*
+Copyright (C) 2021 Westberry Technology (ChangZhou) Corp., Ltd
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+/* All the following default configurations are based on MX25L4006E Nor FLASH. */
+
+/*
+    The slave select pin of the FLASH.
+    This needs to be a normal GPIO pin_t value, such as B14.
+*/
+#ifndef EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN
+#    error "No chip select pin defined -- missing EXTERNAL_FLASH_SPI_SLAVE_SELECT_PIN"
+#endif
+
+/*
+    The clock divisor for SPI to ensure that the MCU is within the
+    specifications of the FLASH chip. Generally this will be PCLK divided by
+    the intended divisor -- check your clock settings and the datasheet of
+    your FLASH.
+*/
+#ifndef EXTERNAL_FLASH_SPI_CLOCK_DIVISOR
+#    ifdef __AVR__
+#        define EXTERNAL_FLASH_SPI_CLOCK_DIVISOR 4
+#    else
+#        define EXTERNAL_FLASH_SPI_CLOCK_DIVISOR 8
+#    endif
+#endif
+
+/*
+    The SPI mode to communicate with the FLASH.
+*/
+#ifndef EXTERNAL_FLASH_SPI_MODE
+#    define EXTERNAL_FLASH_SPI_MODE 0
+#endif
+
+/*
+    Whether or not the SPI communication between the MCU and FLASH should be
+    LSB-first.
+*/
+#ifndef EXTERNAL_FLASH_SPI_LSBFIRST
+#    define EXTERNAL_FLASH_SPI_LSBFIRST false
+#endif
+
+/*
+    The Flash address size in bytes, as specified in datasheet.
+*/
+#ifndef EXTERNAL_FLASH_ADDRESS_SIZE
+#    define EXTERNAL_FLASH_ADDRESS_SIZE 3
+#endif
+
+/*
+    The page size of the FLASH in bytes, as specified in the datasheet.
+*/
+#ifndef EXTERNAL_FLASH_PAGE_SIZE
+#    define EXTERNAL_FLASH_PAGE_SIZE 256
+#endif
+
+/*
+    The sector size of the FLASH in bytes, as specified in the datasheet.
+*/
+#ifndef EXTERNAL_FLASH_SECTOR_SIZE
+#    define EXTERNAL_FLASH_SECTOR_SIZE (4 * 1024)
+#endif
+
+/*
+    The block size of the FLASH in bytes, as specified in the datasheet.
+*/
+#ifndef EXTERNAL_FLASH_BLOCK_SIZE
+#    define EXTERNAL_FLASH_BLOCK_SIZE (64 * 1024)
+#endif
+
+/*
+    The total size of the FLASH in bytes, as specified in the datasheet.
+*/
+#ifndef EXTERNAL_FLASH_SIZE
+#    define EXTERNAL_FLASH_SIZE (512 * 1024)
+#endif
+
+/*
+    The block count of the FLASH, calculated by total FLASH size and block size.
+*/
+#define EXTERNAL_FLASH_BLOCK_COUNT ((EXTERNAL_FLASH_SIZE) / (EXTERNAL_FLASH_BLOCK_SIZE))
+
+/*
+    The sector count of the FLASH, calculated by total FLASH size and sector size.
+*/
+#define EXTERNAL_FLASH_SECTOR_COUNT ((EXTERNAL_FLASH_SIZE) / (EXTERNAL_FLASH_SECTOR_SIZE))
+
+/*
+    The page count of the FLASH, calculated by total FLASH size and page size.
+*/
+#define EXTERNAL_FLASH_PAGE_COUNT ((EXTERNAL_FLASH_SIZE) / (EXTERNAL_FLASH_PAGE_SIZE))
+
+typedef int16_t flash_status_t;
+
+#define FLASH_STATUS_SUCCESS (0)
+#define FLASH_STATUS_ERROR (-1)
+#define FLASH_STATUS_TIMEOUT (-2)
+#define FLASH_STATUS_BAD_ADDRESS (-3)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+void flash_init(void);
+
+flash_status_t flash_erase_chip(void);
+
+flash_status_t flash_erase_block(uint32_t addr);
+
+flash_status_t flash_erase_sector(uint32_t addr);
+
+flash_status_t flash_read_block(uint32_t addr, void *buf, size_t len);
+
+flash_status_t flash_write_block(uint32_t addr, const void *buf, size_t len);
+
+#ifdef __cplusplus
+}
+#endif