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Diffstat (limited to 'supervisor/shared/flash.c')
| -rw-r--r-- | supervisor/shared/flash.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/supervisor/shared/flash.c b/supervisor/shared/flash.c new file mode 100644 index 000000000..c8921aa85 --- /dev/null +++ b/supervisor/shared/flash.c @@ -0,0 +1,202 @@ +/* + * 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 + +#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; +} + +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); + 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); + 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); + 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; + 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; + 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; +} |