wip: littlefs updates - #10

// Disable internal flash, use external spi flash instead
#define MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE (0)
#define MICROPY_HW_SPIFLASH_SIZE_BITS (256 * 1024 * 1024)

#define MICROPY_HW_SPIFLASH_PART1_BITS (128 * 1024 * 1024)
// #define MICROPY_HW_SPIFLASH_PART2_BITS (128 * 1024 * 1024)

#define MICROPY_VFS_LITTLEFS         (1)
#define MICROPY_HW_ENABLE_NATIVE_LFS (1)
#define MICROPY_VFS_LITTLEFS_START_OFFSET_BYTES (MICROPY_HW_SPIFLASH_PART1_BITS/8)

// HW Mode
#define MICROPY_HW_QSPIFLASH_SIZE_BITS_LOG2 (28) // 2^28 == 256Mb
#define MICROPY_HW_QSPIFLASH_CS      (pin_B10)
#define MICROPY_HW_QSPIFLASH_SCK     (pin_F10)
#define MICROPY_HW_QSPIFLASH_IO0     (pin_F8)
#define MICROPY_HW_QSPIFLASH_IO1     (pin_F9)
#define MICROPY_HW_QSPIFLASH_IO2     (pin_F7)
#define MICROPY_HW_QSPIFLASH_IO3     (pin_F6)

// block device config for SPI flash
extern struct _mp_spiflash_config_t spiflash_config;
extern struct _spi_bdev_t spi_bdev;
#define MICROPY_HW_BDEV_IOCTL(op, arg) ( \
    (op) == BDEV_IOCTL_NUM_BLOCKS ? (MICROPY_HW_SPIFLASH_PART1_BITS / 8 / FLASH_BLOCK_SIZE) : \
    (op) == BDEV_IOCTL_INIT ? spi_bdev_ioctl(&spi_bdev, (op), (uint32_t)&spiflash_config) : \
    spi_bdev_ioctl(&spi_bdev, (op), (arg)) \
)
#define MICROPY_HW_BDEV_READBLOCKS(dest, bl, n) spi_bdev_readblocks(&spi_bdev, (dest), (bl), (n))
#define MICROPY_HW_BDEV_WRITEBLOCKS(src, bl, n) spi_bdev_writeblocks(&spi_bdev, (src), (bl), (n))

#include "qspi.h"
#include "storage.h"

// External SPI flash uses standard SPI interface

STATIC const mp_soft_qspi_obj_t qspi_bus = {
    .cs  = MICROPY_HW_QSPIFLASH_CS,
    .clk = MICROPY_HW_QSPIFLASH_SCK,
    .io0 = MICROPY_HW_QSPIFLASH_IO0,
    .io1 = MICROPY_HW_QSPIFLASH_IO1,
    .io2 = MICROPY_HW_QSPIFLASH_IO2,
    .io3 = MICROPY_HW_QSPIFLASH_IO3,
};

STATIC mp_spiflash_cache_t spi_bdev_cache;

const mp_spiflash_config_t spiflash_config = {
    .bus_kind = MP_SPIFLASH_BUS_QSPI,
    .bus.u_qspi.data = (void*)&qspi_bus,
    .bus.u_qspi.proto = &qspi_proto,
    .cache = &spi_bdev_cache,
};

spi_bdev_t spi_bdev;