32475ce98c
Instead of counting words in make, which is slightly awful, notice that possible_devices is local to external_flash.c, so we can declare the array with an automatic bound, and then get the count as the element-count (MP_ARRAY_SIZE) of the array. Since EXTERNAL_FLASH_DEVICE_COUNT is no longer a global macro, switch a few sites to using EXTERNAL_FLASH_DEVICES in `#if` checks instead.
593 lines
21 KiB
C
593 lines
21 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016, 2017 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "supervisor/shared/external_flash/external_flash.h"
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#include <stdint.h>
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#include <string.h>
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#include "supervisor/flash.h"
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#include "supervisor/spi_flash_api.h"
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#include "supervisor/shared/external_flash/common_commands.h"
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#include "extmod/vfs.h"
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#include "extmod/vfs_fat.h"
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#include "py/misc.h"
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "lib/oofatfs/ff.h"
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#include "shared-bindings/microcontroller/__init__.h"
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#include "supervisor/memory.h"
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#include "supervisor/shared/rgb_led_status.h"
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#define NO_SECTOR_LOADED 0xFFFFFFFF
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// The currently cached sector in the cache, ram or flash based.
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static uint32_t current_sector;
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STATIC const external_flash_device possible_devices[] = {EXTERNAL_FLASH_DEVICES};
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#define EXTERNAL_FLASH_DEVICE_COUNT MP_ARRAY_SIZE(possible_devices)
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static const external_flash_device* flash_device = NULL;
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// Track which blocks (up to 32) in the current sector currently live in the
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// cache.
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static uint32_t dirty_mask;
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static supervisor_allocation* supervisor_cache = NULL;
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// Wait until both the write enable and write in progress bits have cleared.
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static bool wait_for_flash_ready(void) {
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bool ok = true;
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// Both the write enable and write in progress bits should be low.
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if (flash_device->no_ready_bit){
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// For NVM without a ready bit in status register
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return ok;
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}
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uint8_t read_status_response[1] = {0x00};
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do {
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ok = spi_flash_read_command(CMD_READ_STATUS, read_status_response, 1);
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} while (ok && (read_status_response[0] & 0x3) != 0);
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return ok;
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}
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// Turn on the write enable bit so we can program and erase the flash.
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static bool write_enable(void) {
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return spi_flash_command(CMD_ENABLE_WRITE);
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}
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// Read data_length's worth of bytes starting at address into data.
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static bool read_flash(uint32_t address, uint8_t* data, uint32_t data_length) {
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if (flash_device == NULL) {
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return false;
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}
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if (!wait_for_flash_ready()) {
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return false;
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}
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return spi_flash_read_data(address, data, data_length);
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}
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// Writes data_length's worth of bytes starting at address from data. Assumes
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// that the sector that address resides in has already been erased. So make sure
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// to run erase_sector.
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static bool write_flash(uint32_t address, const uint8_t* data, uint32_t data_length) {
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if (flash_device == NULL) {
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return false;
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}
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// Don't bother writing if the data is all 1s. Thats equivalent to the flash
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// state after an erase.
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if (!flash_device->no_erase_cmd){
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// Only do this if the device has an erase command
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bool all_ones = true;
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for (uint16_t i = 0; i < data_length; i++) {
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if (data[i] != 0xff) {
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all_ones = false;
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break;
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}
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}
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if (all_ones) {
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return true;
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}
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}
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for (uint32_t bytes_written = 0;
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bytes_written < data_length;
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bytes_written += SPI_FLASH_PAGE_SIZE) {
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if (!wait_for_flash_ready() || !write_enable()) {
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return false;
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}
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if (!spi_flash_write_data(address + bytes_written, (uint8_t*) data + bytes_written,
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SPI_FLASH_PAGE_SIZE)) {
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return false;
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}
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}
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return true;
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}
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static bool page_erased(uint32_t sector_address) {
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// Check the first few bytes to catch the common case where there is data
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// without using a bunch of memory.
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if (flash_device->no_erase_cmd){
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// skip this if device doesn't have an erase command.
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return true;
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}
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uint8_t short_buffer[4];
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if (read_flash(sector_address, short_buffer, 4)) {
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for (uint16_t i = 0; i < 4; i++) {
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if (short_buffer[i] != 0xff) {
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return false;
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}
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}
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} else {
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return false;
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}
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// Now check the full length.
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uint8_t full_buffer[FILESYSTEM_BLOCK_SIZE];
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if (read_flash(sector_address, full_buffer, FILESYSTEM_BLOCK_SIZE)) {
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for (uint16_t i = 0; i < FILESYSTEM_BLOCK_SIZE; i++) {
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if (short_buffer[i] != 0xff) {
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return false;
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}
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}
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} else {
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return false;
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}
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return true;
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}
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// Erases the given sector. Make sure you copied all of the data out of it you
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// need! Also note, sector_address is really 24 bits.
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static bool erase_sector(uint32_t sector_address) {
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// Before we erase the sector we need to wait for any writes to finish and
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// and then enable the write again.
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if (flash_device->no_erase_cmd){
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// skip this if device doesn't have an erase command.
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return true;
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}
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if (!wait_for_flash_ready() || !write_enable()) {
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return false;
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}
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if (flash_device->no_erase_cmd) {
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return true;
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}
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spi_flash_sector_command(CMD_SECTOR_ERASE, sector_address);
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return true;
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}
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// Sector is really 24 bits.
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static bool copy_block(uint32_t src_address, uint32_t dest_address) {
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// Copy page by page to minimize RAM buffer.
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uint16_t page_size = SPI_FLASH_PAGE_SIZE;
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uint8_t buffer[page_size];
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for (uint32_t i = 0; i < FILESYSTEM_BLOCK_SIZE / page_size; i++) {
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if (!read_flash(src_address + i * page_size, buffer, page_size)) {
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return false;
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}
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if (!write_flash(dest_address + i * page_size, buffer, page_size)) {
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return false;
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}
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}
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return true;
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}
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void supervisor_flash_init(void) {
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if (flash_device != NULL) {
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return;
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}
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// Delay to give the SPI Flash time to get going.
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// TODO(tannewt): Only do this when we know power was applied vs a reset.
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uint16_t max_start_up_delay_us = 0;
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for (uint8_t i = 0; i < EXTERNAL_FLASH_DEVICE_COUNT; i++) {
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if (possible_devices[i].start_up_time_us > max_start_up_delay_us) {
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max_start_up_delay_us = possible_devices[i].start_up_time_us;
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}
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}
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common_hal_mcu_delay_us(max_start_up_delay_us);
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spi_flash_init();
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#ifdef EXTERNAL_FLASH_NO_JEDEC
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// For NVM that don't have JEDEC response
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spi_flash_command(CMD_WAKE);
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for (uint8_t i = 0; i < EXTERNAL_FLASH_DEVICE_COUNT; i++) {
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const external_flash_device* possible_device = &possible_devices[i];
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flash_device = possible_device;
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break;
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}
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#else
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// The response will be 0xff if the flash needs more time to start up.
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uint8_t jedec_id_response[3] = {0xff, 0xff, 0xff};
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while (jedec_id_response[0] == 0xff) {
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spi_flash_read_command(CMD_READ_JEDEC_ID, jedec_id_response, 3);
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}
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for (uint8_t i = 0; i < EXTERNAL_FLASH_DEVICE_COUNT; i++) {
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const external_flash_device* possible_device = &possible_devices[i];
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if (jedec_id_response[0] == possible_device->manufacturer_id &&
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jedec_id_response[1] == possible_device->memory_type &&
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jedec_id_response[2] == possible_device->capacity) {
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flash_device = possible_device;
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break;
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}
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}
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#endif
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if (flash_device == NULL) {
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return;
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}
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// We don't know what state the flash is in so wait for any remaining writes and then reset.
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uint8_t read_status_response[1] = {0x00};
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// The write in progress bit should be low.
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do {
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spi_flash_read_command(CMD_READ_STATUS, read_status_response, 1);
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} while ((read_status_response[0] & 0x1) != 0);
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if (!flash_device->single_status_byte) {
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// The suspended write/erase bit should be low.
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do {
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spi_flash_read_command(CMD_READ_STATUS2, read_status_response, 1);
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} while ((read_status_response[0] & 0x80) != 0);
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}
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if (!(flash_device->no_reset_cmd)){
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spi_flash_command(CMD_ENABLE_RESET);
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spi_flash_command(CMD_RESET);
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}
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// Wait 30us for the reset
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common_hal_mcu_delay_us(30);
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spi_flash_init_device(flash_device);
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// Activity LED for flash writes.
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#ifdef MICROPY_HW_LED_MSC
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gpio_set_pin_function(SPI_FLASH_CS_PIN, GPIO_PIN_FUNCTION_OFF);
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gpio_set_pin_direction(MICROPY_HW_LED_MSC, GPIO_DIRECTION_OUT);
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// There's already a pull-up on the board.
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gpio_set_pin_level(MICROPY_HW_LED_MSC, false);
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#endif
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if (flash_device->has_sector_protection) {
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write_enable();
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// Turn off sector protection
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uint8_t data[1] = {0x00};
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spi_flash_write_command(CMD_WRITE_STATUS_BYTE1, data, 1);
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}
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// Turn off writes in case this is a microcontroller only reset.
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spi_flash_command(CMD_DISABLE_WRITE);
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wait_for_flash_ready();
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current_sector = NO_SECTOR_LOADED;
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dirty_mask = 0;
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MP_STATE_VM(flash_ram_cache) = NULL;
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}
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// The size of each individual block.
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uint32_t supervisor_flash_get_block_size(void) {
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return FILESYSTEM_BLOCK_SIZE;
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}
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// The total number of available blocks.
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uint32_t supervisor_flash_get_block_count(void) {
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// We subtract one erase sector size because we may use it as a staging area
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// for writes.
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return (flash_device->total_size - SPI_FLASH_ERASE_SIZE) / FILESYSTEM_BLOCK_SIZE;
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}
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// Flush the cache that was written to the scratch portion of flash. Only used
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// when ram is tight.
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static bool flush_scratch_flash(void) {
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if (current_sector == NO_SECTOR_LOADED) {
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return true;
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}
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// First, copy out any blocks that we haven't touched from the sector we've
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// cached.
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bool copy_to_scratch_ok = true;
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uint32_t scratch_sector = flash_device->total_size - SPI_FLASH_ERASE_SIZE;
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for (uint8_t i = 0; i < SPI_FLASH_ERASE_SIZE / FILESYSTEM_BLOCK_SIZE; i++) {
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if ((dirty_mask & (1 << i)) == 0) {
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copy_to_scratch_ok = copy_to_scratch_ok &&
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copy_block(current_sector + i * FILESYSTEM_BLOCK_SIZE,
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scratch_sector + i * FILESYSTEM_BLOCK_SIZE);
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}
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}
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if (!copy_to_scratch_ok) {
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// TODO(tannewt): Do more here. We opted to not erase and copy bad data
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// in. We still risk losing the data written to the scratch sector.
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return false;
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}
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// Second, erase the current sector.
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erase_sector(current_sector);
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// Finally, copy the new version into it.
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for (uint8_t i = 0; i < SPI_FLASH_ERASE_SIZE / FILESYSTEM_BLOCK_SIZE; i++) {
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copy_block(scratch_sector + i * FILESYSTEM_BLOCK_SIZE,
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current_sector + i * FILESYSTEM_BLOCK_SIZE);
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}
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return true;
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}
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// Attempts to allocate a new set of page buffers for caching a full sector in
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// ram. Each page is allocated separately so that the GC doesn't need to provide
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// one huge block. We can free it as we write if we want to also.
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static bool allocate_ram_cache(void) {
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uint8_t blocks_per_sector = SPI_FLASH_ERASE_SIZE / FILESYSTEM_BLOCK_SIZE;
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uint8_t pages_per_block = FILESYSTEM_BLOCK_SIZE / SPI_FLASH_PAGE_SIZE;
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uint32_t table_size = blocks_per_sector * pages_per_block * sizeof(uint32_t);
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// Attempt to allocate outside the heap first.
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supervisor_cache = allocate_memory(table_size + SPI_FLASH_ERASE_SIZE, false, false);
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if (supervisor_cache != NULL) {
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MP_STATE_VM(flash_ram_cache) = (uint8_t **) supervisor_cache->ptr;
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uint8_t* page_start = (uint8_t *) supervisor_cache->ptr + table_size;
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for (uint8_t i = 0; i < blocks_per_sector; i++) {
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for (uint8_t j = 0; j < pages_per_block; j++) {
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uint32_t offset = i * pages_per_block + j;
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MP_STATE_VM(flash_ram_cache)[offset] = page_start + offset * SPI_FLASH_PAGE_SIZE;
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}
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}
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return true;
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}
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if (MP_STATE_MEM(gc_pool_start) == 0) {
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return false;
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}
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MP_STATE_VM(flash_ram_cache) = m_malloc_maybe(blocks_per_sector * pages_per_block * sizeof(uint32_t), false);
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if (MP_STATE_VM(flash_ram_cache) == NULL) {
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return false;
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}
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// Declare i and j outside the loops in case we fail to allocate everything
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// we need. In that case we'll give it back.
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uint8_t i = 0;
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uint8_t j = 0;
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bool success = true;
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for (i = 0; i < blocks_per_sector; i++) {
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for (j = 0; j < pages_per_block; j++) {
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uint8_t *page_cache = m_malloc_maybe(SPI_FLASH_PAGE_SIZE, false);
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if (page_cache == NULL) {
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success = false;
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break;
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}
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MP_STATE_VM(flash_ram_cache)[i * pages_per_block + j] = page_cache;
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}
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if (!success) {
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break;
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}
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}
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// We couldn't allocate enough so give back what we got.
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if (!success) {
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// We add 1 so that we delete 0 when i is 1. Going to zero (i >= 0)
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// would never stop because i is unsigned.
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i++;
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for (; i > 0; i--) {
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for (; j > 0; j--) {
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m_free(MP_STATE_VM(flash_ram_cache)[(i - 1) * pages_per_block + (j - 1)]);
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}
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j = pages_per_block;
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}
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m_free(MP_STATE_VM(flash_ram_cache));
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MP_STATE_VM(flash_ram_cache) = NULL;
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}
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return success;
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}
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static void release_ram_cache(void) {
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if (supervisor_cache != NULL) {
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free_memory(supervisor_cache);
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supervisor_cache = NULL;
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} else if (MP_STATE_MEM(gc_pool_start)) {
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m_free(MP_STATE_VM(flash_ram_cache));
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}
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MP_STATE_VM(flash_ram_cache) = NULL;
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}
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// Flush the cached sector from ram onto the flash. We'll free the cache unless
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// keep_cache is true.
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static bool flush_ram_cache(bool keep_cache) {
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if (current_sector == NO_SECTOR_LOADED) {
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if (!keep_cache) {
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release_ram_cache();
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}
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return true;
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}
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// First, copy out any blocks that we haven't touched from the sector
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// we've cached. If we don't do this we'll erase the data during the sector
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// erase below.
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bool copy_to_ram_ok = true;
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uint8_t pages_per_block = FILESYSTEM_BLOCK_SIZE / SPI_FLASH_PAGE_SIZE;
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for (uint8_t i = 0; i < SPI_FLASH_ERASE_SIZE / FILESYSTEM_BLOCK_SIZE; i++) {
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if ((dirty_mask & (1 << i)) == 0) {
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for (uint8_t j = 0; j < pages_per_block; j++) {
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copy_to_ram_ok = read_flash(
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current_sector + (i * pages_per_block + j) * SPI_FLASH_PAGE_SIZE,
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MP_STATE_VM(flash_ram_cache)[i * pages_per_block + j],
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SPI_FLASH_PAGE_SIZE);
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if (!copy_to_ram_ok) {
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break;
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}
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}
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}
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if (!copy_to_ram_ok) {
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break;
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}
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}
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if (!copy_to_ram_ok) {
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return false;
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}
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// Second, erase the current sector.
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erase_sector(current_sector);
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// Lastly, write all the data in ram that we've cached.
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for (uint8_t i = 0; i < SPI_FLASH_ERASE_SIZE / FILESYSTEM_BLOCK_SIZE; i++) {
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for (uint8_t j = 0; j < pages_per_block; j++) {
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write_flash(current_sector + (i * pages_per_block + j) * SPI_FLASH_PAGE_SIZE,
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MP_STATE_VM(flash_ram_cache)[i * pages_per_block + j],
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SPI_FLASH_PAGE_SIZE);
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if (!keep_cache && supervisor_cache == NULL && MP_STATE_MEM(gc_pool_start)) {
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m_free(MP_STATE_VM(flash_ram_cache)[i * pages_per_block + j]);
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}
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}
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}
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// We're done with the cache for now so give it back.
|
|
if (!keep_cache) {
|
|
release_ram_cache();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Delegates to the correct flash flush method depending on the existing cache.
|
|
// TODO Don't blink the status indicator if we don't actually do any writing (hard to tell right now).
|
|
static void spi_flash_flush_keep_cache(bool keep_cache) {
|
|
#ifdef MICROPY_HW_LED_MSC
|
|
port_pin_set_output_level(MICROPY_HW_LED_MSC, true);
|
|
#endif
|
|
temp_status_color(ACTIVE_WRITE);
|
|
// If we've cached to the flash itself flush from there.
|
|
if (MP_STATE_VM(flash_ram_cache) == NULL) {
|
|
flush_scratch_flash();
|
|
} else {
|
|
flush_ram_cache(keep_cache);
|
|
}
|
|
current_sector = NO_SECTOR_LOADED;
|
|
clear_temp_status();
|
|
#ifdef MICROPY_HW_LED_MSC
|
|
port_pin_set_output_level(MICROPY_HW_LED_MSC, false);
|
|
#endif
|
|
}
|
|
|
|
void supervisor_external_flash_flush(void) {
|
|
spi_flash_flush_keep_cache(true);
|
|
}
|
|
|
|
void supervisor_flash_release_cache(void) {
|
|
spi_flash_flush_keep_cache(false);
|
|
}
|
|
|
|
static int32_t convert_block_to_flash_addr(uint32_t block) {
|
|
if (0 <= block && block < supervisor_flash_get_block_count()) {
|
|
// a block in partition 1
|
|
return block * FILESYSTEM_BLOCK_SIZE;
|
|
}
|
|
// bad block
|
|
return -1;
|
|
}
|
|
|
|
bool external_flash_read_block(uint8_t *dest, uint32_t block) {
|
|
int32_t address = convert_block_to_flash_addr(block);
|
|
if (address == -1) {
|
|
// bad block number
|
|
return false;
|
|
}
|
|
|
|
// Mask out the lower bits that designate the address within the sector.
|
|
uint32_t this_sector = address & (~(SPI_FLASH_ERASE_SIZE - 1));
|
|
uint8_t block_index = (address / FILESYSTEM_BLOCK_SIZE) % (SPI_FLASH_ERASE_SIZE / FILESYSTEM_BLOCK_SIZE);
|
|
uint8_t mask = 1 << (block_index);
|
|
// We're reading from the currently cached sector.
|
|
if (current_sector == this_sector && (mask & dirty_mask) > 0) {
|
|
if (MP_STATE_VM(flash_ram_cache) != NULL) {
|
|
uint8_t pages_per_block = FILESYSTEM_BLOCK_SIZE / SPI_FLASH_PAGE_SIZE;
|
|
for (int i = 0; i < pages_per_block; i++) {
|
|
memcpy(dest + i * SPI_FLASH_PAGE_SIZE,
|
|
MP_STATE_VM(flash_ram_cache)[block_index * pages_per_block + i],
|
|
SPI_FLASH_PAGE_SIZE);
|
|
}
|
|
return true;
|
|
} else {
|
|
uint32_t scratch_address = flash_device->total_size - SPI_FLASH_ERASE_SIZE + block_index * FILESYSTEM_BLOCK_SIZE;
|
|
return read_flash(scratch_address, dest, FILESYSTEM_BLOCK_SIZE);
|
|
}
|
|
}
|
|
return read_flash(address, dest, FILESYSTEM_BLOCK_SIZE);
|
|
}
|
|
|
|
bool external_flash_write_block(const uint8_t *data, uint32_t block) {
|
|
// Non-MBR block, copy to cache
|
|
int32_t address = convert_block_to_flash_addr(block);
|
|
if (address == -1) {
|
|
// bad block number
|
|
return false;
|
|
}
|
|
// Wait for any previous writes to finish.
|
|
wait_for_flash_ready();
|
|
// Mask out the lower bits that designate the address within the sector.
|
|
uint32_t this_sector = address & (~(SPI_FLASH_ERASE_SIZE - 1));
|
|
uint8_t block_index = (address / FILESYSTEM_BLOCK_SIZE) % (SPI_FLASH_ERASE_SIZE / FILESYSTEM_BLOCK_SIZE);
|
|
uint8_t mask = 1 << (block_index);
|
|
// Flush the cache if we're moving onto a sector or we're writing the
|
|
// same block again.
|
|
if (current_sector != this_sector || (mask & dirty_mask) > 0) {
|
|
// Check to see if we'd write to an erased page. In that case we
|
|
// can write directly.
|
|
if (page_erased(address)) {
|
|
return write_flash(address, data, FILESYSTEM_BLOCK_SIZE);
|
|
}
|
|
if (current_sector != NO_SECTOR_LOADED) {
|
|
supervisor_flash_flush();
|
|
}
|
|
if (MP_STATE_VM(flash_ram_cache) == NULL && !allocate_ram_cache()) {
|
|
erase_sector(flash_device->total_size - SPI_FLASH_ERASE_SIZE);
|
|
wait_for_flash_ready();
|
|
}
|
|
current_sector = this_sector;
|
|
dirty_mask = 0;
|
|
}
|
|
dirty_mask |= mask;
|
|
// Copy the block to the appropriate cache.
|
|
if (MP_STATE_VM(flash_ram_cache) != NULL) {
|
|
uint8_t pages_per_block = FILESYSTEM_BLOCK_SIZE / SPI_FLASH_PAGE_SIZE;
|
|
for (int i = 0; i < pages_per_block; i++) {
|
|
memcpy(MP_STATE_VM(flash_ram_cache)[block_index * pages_per_block + i],
|
|
data + i * SPI_FLASH_PAGE_SIZE,
|
|
SPI_FLASH_PAGE_SIZE);
|
|
}
|
|
return true;
|
|
} else {
|
|
uint32_t scratch_address = flash_device->total_size - SPI_FLASH_ERASE_SIZE + block_index * FILESYSTEM_BLOCK_SIZE;
|
|
return write_flash(scratch_address, data, FILESYSTEM_BLOCK_SIZE);
|
|
}
|
|
}
|
|
|
|
mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block_num, uint32_t num_blocks) {
|
|
for (size_t i = 0; i < num_blocks; i++) {
|
|
if (!external_flash_read_block(dest + i * FILESYSTEM_BLOCK_SIZE, block_num + i)) {
|
|
return 1; // error
|
|
}
|
|
}
|
|
return 0; // success
|
|
}
|
|
|
|
mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t block_num, uint32_t num_blocks) {
|
|
for (size_t i = 0; i < num_blocks; i++) {
|
|
if (!external_flash_write_block(src + i * FILESYSTEM_BLOCK_SIZE, block_num + i)) {
|
|
return 1; // error
|
|
}
|
|
}
|
|
return 0; // success
|
|
}
|