circuitpython/ports/nrf/supervisor/internal_flash.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* 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 "supervisor/flash.h"
#include <stdint.h>
#include <string.h>
#include "extmod/vfs.h"
#include "extmod/vfs_fat.h"
#include "py/mphal.h"
#include "py/obj.h"
#include "py/runtime.h"
#include "lib/oofatfs/ff.h"
#include "nrf_nvmc.h"
#ifdef BLUETOOTH_SD
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#include "ble_drv.h"
#include "nrf_sdm.h"
#endif
// defined in linker
extern uint32_t __fatfs_flash_start_addr[];
extern uint32_t __fatfs_flash_length[];
#define NO_CACHE 0xffffffff
#define FL_PAGE_SZ 4096
uint8_t _flash_cache[FL_PAGE_SZ] __attribute__((aligned(4)));
uint32_t _flash_page_addr = NO_CACHE;
/*------------------------------------------------------------------*/
/* Internal Flash API
*------------------------------------------------------------------*/
static inline uint32_t lba2addr(uint32_t block) {
return ((uint32_t)__fatfs_flash_start_addr) + block * FILESYSTEM_BLOCK_SIZE;
}
void supervisor_flash_init(void) {
}
uint32_t supervisor_flash_get_block_size(void) {
return FILESYSTEM_BLOCK_SIZE;
}
uint32_t supervisor_flash_get_block_count(void) {
return ((uint32_t) __fatfs_flash_length) / FILESYSTEM_BLOCK_SIZE ;
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}
#ifdef BLUETOOTH_SD
STATIC void sd_flash_operation_start(void) {
sd_flash_operation_status = SD_FLASH_OPERATION_IN_PROGRESS;
}
STATIC sd_flash_operation_status_t sd_flash_operation_wait_until_done(void) {
while (sd_flash_operation_status == SD_FLASH_OPERATION_IN_PROGRESS) {
sd_app_evt_wait();
}
return sd_flash_operation_status;
}
#endif
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void supervisor_flash_flush(void) {
if (_flash_page_addr == NO_CACHE) return;
// Skip if data is the same
if (memcmp(_flash_cache, (void *)_flash_page_addr, FL_PAGE_SZ) != 0) {
#ifdef BLUETOOTH_SD
uint8_t sd_en = 0;
(void) sd_softdevice_is_enabled(&sd_en);
if (sd_en) {
uint32_t err_code;
sd_flash_operation_status_t status;
sd_flash_operation_start();
err_code = sd_flash_page_erase(_flash_page_addr / FL_PAGE_SZ);
if (err_code != NRF_SUCCESS) {
mp_raise_OSError_msg_varg(translate("Flash erase failed to start, err 0x%04x"), err_code);
}
status = sd_flash_operation_wait_until_done();
if (status == SD_FLASH_OPERATION_ERROR) {
mp_raise_OSError_msg(translate("Flash erase failed"));
}
// Divide a full page into parts, because writing a full page causes an assertion failure.
// See https://devzone.nordicsemi.com/f/nordic-q-a/40088/sd_flash_write-cause-nrf_fault_id_sd_assert/
const size_t BLOCK_PARTS = 2;
size_t words_to_write = FL_PAGE_SZ / sizeof(uint32_t) / BLOCK_PARTS;
for (size_t i = 0; i < BLOCK_PARTS; i++) {
sd_flash_operation_start();
err_code = sd_flash_write(((uint32_t *)_flash_page_addr) + i * words_to_write,
(uint32_t *)_flash_cache + i * words_to_write,
words_to_write);
if (err_code != NRF_SUCCESS) {
mp_raise_OSError_msg_varg(translate("Flash write failed to start, err 0x%04x"), err_code);
}
status = sd_flash_operation_wait_until_done();
if (status == SD_FLASH_OPERATION_ERROR) {
mp_raise_OSError_msg(translate("Flash write failed"));
}
}
} else {
#endif
nrf_nvmc_page_erase(_flash_page_addr);
nrf_nvmc_write_words(_flash_page_addr, (uint32_t *)_flash_cache, FL_PAGE_SZ / sizeof(uint32_t));
#ifdef BLUETOOTH_SD
}
#endif
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}
_flash_page_addr = NO_CACHE;
}
void supervisor_flash_release_cache(void) {
}
mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t num_blocks) {
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// Must write out anything in cache before trying to read.
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supervisor_flash_flush();
uint32_t src = lba2addr(block);
memcpy(dest, (uint8_t*) src, FILESYSTEM_BLOCK_SIZE*num_blocks);
return 0; // success
}
mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t lba, uint32_t num_blocks) {
while (num_blocks) {
uint32_t const addr = lba2addr(lba);
uint32_t const page_addr = addr & ~(FL_PAGE_SZ - 1);
uint32_t count = 8 - (lba % 8); // up to page boundary
count = MIN(num_blocks, count);
if (page_addr != _flash_page_addr) {
supervisor_flash_flush();
_flash_page_addr = page_addr;
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// Copy the current contents of the entire page into the cache.
memcpy(_flash_cache, (void *)page_addr, FL_PAGE_SZ);
}
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// Overwrite part or all of the page cache with the src data.
memcpy(_flash_cache + (addr & (FL_PAGE_SZ - 1)), src, count * FILESYSTEM_BLOCK_SIZE);
// adjust for next run
lba += count;
src += count * FILESYSTEM_BLOCK_SIZE;
num_blocks -= count;
}
return 0; // success
}