circuitpython/supervisor/shared/flash.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Scott Shawcroft
*
* 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 "extmod/vfs_fat.h"
#include "py/runtime.h"
#include "lib/oofatfs/ff.h"
#define VFS_INDEX 0
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#define PART1_START_BLOCK (0x1)
void supervisor_flash_set_usb_writable(bool usb_writable) {
mp_vfs_mount_t* current_mount = MP_STATE_VM(vfs_mount_table);
for (uint8_t i = 0; current_mount != NULL; i++) {
if (i == VFS_INDEX) {
break;
}
current_mount = current_mount->next;
}
if (current_mount == NULL) {
return;
}
fs_user_mount_t *vfs = (fs_user_mount_t *) current_mount->obj;
if (usb_writable) {
vfs->flags |= FSUSER_USB_WRITABLE;
} else {
vfs->flags &= ~FSUSER_USB_WRITABLE;
}
}
// there is a singleton Flash object
const mp_obj_type_t supervisor_flash_type;
STATIC const mp_obj_base_t supervisor_flash_obj = {&supervisor_flash_type};
STATIC mp_obj_t supervisor_flash_obj_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 0, 0, false);
// return singleton object
return (mp_obj_t)&supervisor_flash_obj;
}
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uint32_t flash_get_block_count(void) {
return PART1_START_BLOCK + supervisor_flash_get_block_count();
}
static void build_partition(uint8_t *buf, int boot, int type, uint32_t start_block, uint32_t num_blocks) {
buf[0] = boot;
if (num_blocks == 0) {
buf[1] = 0;
buf[2] = 0;
buf[3] = 0;
} else {
buf[1] = 0xff;
buf[2] = 0xff;
buf[3] = 0xff;
}
buf[4] = type;
if (num_blocks == 0) {
buf[5] = 0;
buf[6] = 0;
buf[7] = 0;
} else {
buf[5] = 0xff;
buf[6] = 0xff;
buf[7] = 0xff;
}
buf[8] = start_block;
buf[9] = start_block >> 8;
buf[10] = start_block >> 16;
buf[11] = start_block >> 24;
buf[12] = num_blocks;
buf[13] = num_blocks >> 8;
buf[14] = num_blocks >> 16;
buf[15] = num_blocks >> 24;
}
mp_uint_t flash_read_blocks(uint8_t *dest, uint32_t block_num, uint32_t num_blocks) {
if (block_num == 0) {
if (block_num > 1) {
return 1; // error
}
// fake the MBR so we can decide on our own partition table
for (int i = 0; i < 446; i++) {
dest[i] = 0;
}
build_partition(dest + 446, 0, 0x01 /* FAT12 */, PART1_START_BLOCK, supervisor_flash_get_block_count());
build_partition(dest + 462, 0, 0, 0, 0);
build_partition(dest + 478, 0, 0, 0, 0);
build_partition(dest + 494, 0, 0, 0, 0);
dest[510] = 0x55;
dest[511] = 0xaa;
return 0; // ok
}
return supervisor_flash_read_blocks(dest, block_num - PART1_START_BLOCK, num_blocks);
}
mp_uint_t flash_write_blocks(const uint8_t *src, uint32_t block_num, uint32_t num_blocks) {
if (block_num == 0) {
if (num_blocks > 1) {
return 1; // error
}
// can't write MBR, but pretend we did
return 0;
} else {
return supervisor_flash_write_blocks(src, block_num - PART1_START_BLOCK, num_blocks);
}
}
STATIC mp_obj_t supervisor_flash_obj_readblocks(mp_obj_t self, mp_obj_t block_num, mp_obj_t buf) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_WRITE);
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mp_uint_t ret = flash_read_blocks(bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / FILESYSTEM_BLOCK_SIZE);
return MP_OBJ_NEW_SMALL_INT(ret);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(supervisor_flash_obj_readblocks_obj, supervisor_flash_obj_readblocks);
STATIC mp_obj_t supervisor_flash_obj_writeblocks(mp_obj_t self, mp_obj_t block_num, mp_obj_t buf) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ);
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mp_uint_t ret = flash_write_blocks(bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / FILESYSTEM_BLOCK_SIZE);
return MP_OBJ_NEW_SMALL_INT(ret);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(supervisor_flash_obj_writeblocks_obj, supervisor_flash_obj_writeblocks);
STATIC mp_obj_t supervisor_flash_obj_ioctl(mp_obj_t self, mp_obj_t cmd_in, mp_obj_t arg_in) {
mp_int_t cmd = mp_obj_get_int(cmd_in);
switch (cmd) {
case BP_IOCTL_INIT: supervisor_flash_init(); return MP_OBJ_NEW_SMALL_INT(0);
case BP_IOCTL_DEINIT: supervisor_flash_flush(); return MP_OBJ_NEW_SMALL_INT(0); // TODO properly
case BP_IOCTL_SYNC: supervisor_flash_flush(); return MP_OBJ_NEW_SMALL_INT(0);
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case BP_IOCTL_SEC_COUNT: return MP_OBJ_NEW_SMALL_INT(flash_get_block_count());
case BP_IOCTL_SEC_SIZE: return MP_OBJ_NEW_SMALL_INT(supervisor_flash_get_block_size());
default: return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(supervisor_flash_obj_ioctl_obj, supervisor_flash_obj_ioctl);
STATIC const mp_rom_map_elem_t supervisor_flash_obj_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_readblocks), MP_ROM_PTR(&supervisor_flash_obj_readblocks_obj) },
{ MP_ROM_QSTR(MP_QSTR_writeblocks), MP_ROM_PTR(&supervisor_flash_obj_writeblocks_obj) },
{ MP_ROM_QSTR(MP_QSTR_ioctl), MP_ROM_PTR(&supervisor_flash_obj_ioctl_obj) },
};
STATIC MP_DEFINE_CONST_DICT(supervisor_flash_obj_locals_dict, supervisor_flash_obj_locals_dict_table);
const mp_obj_type_t supervisor_flash_type = {
{ &mp_type_type },
.name = MP_QSTR_Flash,
.make_new = supervisor_flash_obj_make_new,
.locals_dict = (mp_obj_t)&supervisor_flash_obj_locals_dict,
};
void supervisor_flash_init_vfs(fs_user_mount_t *vfs) {
vfs->base.type = &mp_fat_vfs_type;
vfs->flags |= FSUSER_NATIVE | FSUSER_HAVE_IOCTL;
vfs->fatfs.drv = vfs;
vfs->fatfs.part = 1; // flash filesystem lives on first partition
vfs->readblocks[0] = (mp_obj_t)&supervisor_flash_obj_readblocks_obj;
vfs->readblocks[1] = (mp_obj_t)&supervisor_flash_obj;
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vfs->readblocks[2] = (mp_obj_t)flash_read_blocks; // native version
vfs->writeblocks[0] = (mp_obj_t)&supervisor_flash_obj_writeblocks_obj;
vfs->writeblocks[1] = (mp_obj_t)&supervisor_flash_obj;
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vfs->writeblocks[2] = (mp_obj_t)flash_write_blocks; // native version
vfs->u.ioctl[0] = (mp_obj_t)&supervisor_flash_obj_ioctl_obj;
vfs->u.ioctl[1] = (mp_obj_t)&supervisor_flash_obj;
}