circuitpython/ports/mimxrt/mimxrt_flash.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020-2021 Damien P. George
* Copyright (c) 2021 Philipp Ebensberger
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/runtime.h"
#include "extmod/vfs.h"
#include "modmimxrt.h"
#include BOARD_FLASH_OPS_HEADER_H
// BOARD_FLASH_SIZE is defined in mpconfigport.h
#define SECTOR_SIZE_BYTES (qspiflash_config.sectorSize)
#define PAGE_SIZE_BYTES (qspiflash_config.pageSize)
#ifndef MICROPY_HW_FLASH_STORAGE_BYTES
#define MICROPY_HW_FLASH_STORAGE_BYTES (((uint32_t)&__vfs_end) - ((uint32_t)&__vfs_start))
#endif
#ifndef MICROPY_HW_FLASH_STORAGE_BASE
#define MICROPY_HW_FLASH_STORAGE_BASE (((uint32_t)&__vfs_start) - ((uint32_t)&__flash_start))
#endif
// Linker symbols
extern uint8_t __vfs_start;
extern uint8_t __vfs_end;
extern uint8_t __flash_start;
extern flexspi_nor_config_t qspiflash_config;
typedef struct _mimxrt_flash_obj_t {
mp_obj_base_t base;
uint32_t flash_base;
uint32_t flash_size;
} mimxrt_flash_obj_t;
STATIC mimxrt_flash_obj_t mimxrt_flash_obj = {
.base = { &mimxrt_flash_type }
};
// flash_erase_block(erase_addr_bytes)
// erases the sector starting at addr. Sector size according to the flash properties.
status_t flash_erase_block(uint32_t erase_addr) __attribute__((section(".ram_functions")));
status_t flash_erase_block(uint32_t erase_addr) {
status_t status;
SCB_CleanInvalidateDCache();
SCB_DisableDCache();
__disable_irq();
status = flexspi_nor_flash_erase_sector(FLEXSPI, erase_addr);
__enable_irq();
SCB_EnableDCache();
return status;
}
// flash_write_block(flash_dest_addr_bytes, data_source, length_bytes)
// writes length_byte data to the destination address
// the vfs driver takes care for erasing the sector if required
status_t flash_write_block(uint32_t dest_addr, const uint8_t *src, uint32_t length) __attribute__((section(".ram_functions")));
status_t flash_write_block(uint32_t dest_addr, const uint8_t *src, uint32_t length) {
status_t status;
uint32_t size;
uint32_t next_addr;
SCB_CleanInvalidateDCache();
SCB_DisableDCache();
// write data in chunks not crossing a page boundary
while (length > 0) {
next_addr = dest_addr - (dest_addr % PAGE_SIZE_BYTES) + PAGE_SIZE_BYTES; // next page boundary
size = next_addr - dest_addr; // maximal chunk length
if (size > length) { // compare against remaining data size
size = length;
}
__disable_irq();
status = flexspi_nor_flash_page_program(FLEXSPI, dest_addr, (uint32_t *)src, size);
__enable_irq();
if (status != kStatus_Success) {
break;
}
length -= size;
src += size;
dest_addr += size;
}
SCB_EnableDCache();
return status;
}
STATIC mp_obj_t mimxrt_flash_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
// Check args.
mp_arg_check_num(n_args, n_kw, 0, 0, false);
// Upload the custom flash configuration
// This should be performed by the boot ROM but for some reason it is not.
FLEXSPI_UpdateLUT(FLEXSPI, 0,
qspiflash_config.memConfig.lookupTable,
ARRAY_SIZE(qspiflash_config.memConfig.lookupTable));
// Configure FLEXSPI IP FIFO access.
FLEXSPI->MCR0 &= ~(FLEXSPI_MCR0_ARDFEN_MASK);
FLEXSPI->MCR0 &= ~(FLEXSPI_MCR0_ATDFEN_MASK);
FLEXSPI->MCR0 |= FLEXSPI_MCR0_ARDFEN(0);
FLEXSPI->MCR0 |= FLEXSPI_MCR0_ATDFEN(0);
// Update information based on linker symbols.
mimxrt_flash_obj.flash_base = MICROPY_HW_FLASH_STORAGE_BASE;
mimxrt_flash_obj.flash_size = MICROPY_HW_FLASH_STORAGE_BYTES;
// Return singleton object.
return MP_OBJ_FROM_PTR(&mimxrt_flash_obj);
}
// readblocks(block_num, buf, [offset])
// read size of buffer number of bytes from block (with offset) into buffer
STATIC mp_obj_t mimxrt_flash_readblocks(size_t n_args, const mp_obj_t *args) {
mimxrt_flash_obj_t *self = MP_OBJ_TO_PTR(args[0]);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_WRITE);
// Calculate read offset from block number.
uint32_t offset = mp_obj_get_int(args[1]) * SECTOR_SIZE_BYTES;
// Add optional offset
if (n_args == 4) {
offset += mp_obj_get_int(args[3]);
}
memcpy(bufinfo.buf, (uint8_t *)(FlexSPI_AMBA_BASE + self->flash_base + offset), bufinfo.len);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mimxrt_flash_readblocks_obj, 3, 4, mimxrt_flash_readblocks);
// writeblocks(block_num, buf, [offset])
// Erase block based on block_num and write buffer size number of bytes from buffer into block. If additional offset
// parameter is provided only write operation at block start + offset will be performed.
// This requires a prior erase operation of the block!
STATIC mp_obj_t mimxrt_flash_writeblocks(size_t n_args, const mp_obj_t *args) {
status_t status;
mimxrt_flash_obj_t *self = MP_OBJ_TO_PTR(args[0]);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_READ);
// Calculate read offset from block number.
uint32_t offset = mp_obj_get_int(args[1]) * SECTOR_SIZE_BYTES;
if (n_args == 3) {
status = flash_erase_block(self->flash_base + offset);
if (status != kStatus_Success) {
mp_raise_msg_varg(&mp_type_OSError, MP_ERROR_TEXT("flash erase command failed with %d"), status);
}
} else {
// Add optional offset
offset += mp_obj_get_int(args[3]);
}
status = flash_write_block(self->flash_base + offset, bufinfo.buf, bufinfo.len);
if (status != kStatus_Success) {
mp_raise_msg_varg(&mp_type_OSError, MP_ERROR_TEXT("flash block write command failed with %d"), status);
}
return MP_OBJ_NEW_SMALL_INT(status != kStatus_Success);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mimxrt_flash_writeblocks_obj, 3, 4, mimxrt_flash_writeblocks);
// ioctl(op, arg)
STATIC mp_obj_t mimxrt_flash_ioctl(mp_obj_t self_in, mp_obj_t cmd_in, mp_obj_t arg_in) {
mimxrt_flash_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_int_t cmd = mp_obj_get_int(cmd_in);
status_t status;
switch (cmd) {
case MP_BLOCKDEV_IOCTL_INIT:
return MP_OBJ_NEW_SMALL_INT(0);
case MP_BLOCKDEV_IOCTL_DEINIT:
return MP_OBJ_NEW_SMALL_INT(0);
case MP_BLOCKDEV_IOCTL_SYNC:
return MP_OBJ_NEW_SMALL_INT(0);
case MP_BLOCKDEV_IOCTL_BLOCK_COUNT:
return MP_OBJ_NEW_SMALL_INT(self->flash_size / SECTOR_SIZE_BYTES);
case MP_BLOCKDEV_IOCTL_BLOCK_SIZE:
return MP_OBJ_NEW_SMALL_INT(SECTOR_SIZE_BYTES);
case MP_BLOCKDEV_IOCTL_BLOCK_ERASE: {
uint32_t offset = mp_obj_get_int(arg_in) * SECTOR_SIZE_BYTES;
status = flash_erase_block(self->flash_base + offset);
return MP_OBJ_NEW_SMALL_INT(status != kStatus_Success);
}
default:
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(mimxrt_flash_ioctl_obj, mimxrt_flash_ioctl);
STATIC const mp_rom_map_elem_t mimxrt_flash_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_readblocks), MP_ROM_PTR(&mimxrt_flash_readblocks_obj) },
{ MP_ROM_QSTR(MP_QSTR_writeblocks), MP_ROM_PTR(&mimxrt_flash_writeblocks_obj) },
{ MP_ROM_QSTR(MP_QSTR_ioctl), MP_ROM_PTR(&mimxrt_flash_ioctl_obj) },
};
STATIC MP_DEFINE_CONST_DICT(mimxrt_flash_locals_dict, mimxrt_flash_locals_dict_table);
const mp_obj_type_t mimxrt_flash_type = {
{ &mp_type_type },
.name = MP_QSTR_Flash,
.make_new = mimxrt_flash_make_new,
.locals_dict = (mp_obj_dict_t *)&mimxrt_flash_locals_dict,
};