/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 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 <stdio.h>

#include "py/objarray.h"
#include "py/runtime.h"
#include "extmod/vfs.h"
#include "py/mperrno.h"
#include "samd_soc.h"

#if MICROPY_HW_MCUFLASH || MICROPY_VFS_ROM

// ASF 4
#include "hal_flash.h"
#include "hal_init.h"
#include "hpl_gclk_base.h"

#if defined(MCU_SAMD21)
#include "lib/asf4/samd21/hpl/pm/hpl_pm_base.h"
#elif defined(MCU_SAMD51)
#include "lib/asf4/samd51/hpl/pm/hpl_pm_base.h"
#include "lib/asf4/samd51/hri/hri_mclk_d51.h"
#endif

static struct flash_descriptor flash_desc;
extern const mp_obj_type_t samd_flash_type;

typedef struct _samd_flash_obj_t {
    mp_obj_base_t base;
    uint32_t flash_base;
    uint32_t flash_size;
} samd_flash_obj_t;

#if MICROPY_HW_MCUFLASH
static mp_int_t BLOCK_SIZE = VFS_BLOCK_SIZE_BYTES; // Board specific: mpconfigboard.h
extern uint8_t _oflash_fs, _sflash_fs;
// Build a Flash storage at top.
static samd_flash_obj_t samd_flash_obj = {
    .base = { &samd_flash_type },
    .flash_base = (uint32_t)&_oflash_fs, // Get from MCU-Specific loader script.
    .flash_size = (uint32_t)&_sflash_fs, // Get from MCU-Specific loader script.
};

static mp_obj_t samd_flash_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
    // No args required. bdev=Flash(). Start Addr & Size defined in samd_flash_obj.
    mp_arg_check_num(n_args, n_kw, 0, 0, false);

    // Return singleton object.
    return MP_OBJ_FROM_PTR(&samd_flash_obj);
}

static mp_int_t samd_flash_get_buffer(mp_obj_t self_in, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
    samd_flash_obj_t *self = MP_OBJ_TO_PTR(self_in);
    if (flags == MP_BUFFER_READ) {
        bufinfo->buf = (void *)((uintptr_t)self->flash_base);
        bufinfo->len = self->flash_size;
        bufinfo->typecode = 'B';
        return 0;
    } else {
        // Write unsupported.
        return 1;
    }
}
#endif  // MICROPY_HW_MCUFLASH

// Flash init (from cctpy)
// Method is needed for when MP starts up in _boot.py
void samd_flash_init(void) {
    #ifdef SAMD51
    hri_mclk_set_AHBMASK_NVMCTRL_bit(MCLK);
    #endif
    #ifdef SAMD21
    _pm_enable_bus_clock(PM_BUS_APBB, NVMCTRL);
    #endif

    flash_init(&flash_desc, NVMCTRL);
}

#if MICROPY_HW_MCUFLASH
// Function for ioctl.
static mp_obj_t eraseblock(uint32_t sector_in) {
    // Destination address aligned with page start to be erased.
    uint32_t dest_addr = sector_in; // Number of pages to be erased.
    mp_int_t page_size = flash_get_page_size(&flash_desc); // adf4 API call

    flash_erase(&flash_desc, dest_addr, (BLOCK_SIZE / page_size));

    return mp_const_none;
}

static mp_obj_t samd_flash_version(void) {
    return MP_OBJ_NEW_SMALL_INT(flash_get_version());
}
static MP_DEFINE_CONST_FUN_OBJ_0(samd_flash_version_obj, samd_flash_version);

static mp_obj_t samd_flash_readblocks(size_t n_args, const mp_obj_t *args) {
    samd_flash_obj_t *self = MP_OBJ_TO_PTR(args[0]);
    uint32_t offset = (mp_obj_get_int(args[1]) * BLOCK_SIZE) + self->flash_base;
    mp_buffer_info_t bufinfo;
    mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_WRITE);
    if (n_args == 4) {
        offset += mp_obj_get_int(args[3]);
    }

    // Read data to flash (adf4 API)
    flash_read(&flash_desc, offset, bufinfo.buf, bufinfo.len);

    return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(samd_flash_readblocks_obj, 3, 4, samd_flash_readblocks);

static mp_obj_t samd_flash_writeblocks(size_t n_args, const mp_obj_t *args) {
    samd_flash_obj_t *self = MP_OBJ_TO_PTR(args[0]);
    uint32_t offset = (mp_obj_get_int(args[1]) * BLOCK_SIZE) + self->flash_base;
    mp_buffer_info_t bufinfo;
    mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_READ);
    if (n_args == 3) {
        eraseblock(offset);
        // TODO check return value
    } else {
        offset += mp_obj_get_int(args[3]);
    }
    // Write data to flash (adf4 API)
    flash_write(&flash_desc, offset, bufinfo.buf, bufinfo.len);

    return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(samd_flash_writeblocks_obj, 3, 4, samd_flash_writeblocks);

static mp_obj_t samd_flash_ioctl(mp_obj_t self_in, mp_obj_t cmd_in, mp_obj_t arg_in) {
    samd_flash_obj_t *self = MP_OBJ_TO_PTR(self_in);
    mp_int_t cmd = mp_obj_get_int(cmd_in);

    switch (cmd) {
        case MP_BLOCKDEV_IOCTL_INIT:
            samd_flash_init();
            return MP_OBJ_NEW_SMALL_INT(0);
        case MP_BLOCKDEV_IOCTL_DEINIT:
            return MP_OBJ_NEW_SMALL_INT(0);
        case MP_BLOCKDEV_IOCTL_SYNC:
            return MP_OBJ_NEW_SMALL_INT(0);
        case MP_BLOCKDEV_IOCTL_BLOCK_COUNT:
            return MP_OBJ_NEW_SMALL_INT(self->flash_size / BLOCK_SIZE);
        case MP_BLOCKDEV_IOCTL_BLOCK_SIZE:
            return MP_OBJ_NEW_SMALL_INT(BLOCK_SIZE);
        case MP_BLOCKDEV_IOCTL_BLOCK_ERASE: {
            eraseblock(mp_obj_get_int(arg_in) * BLOCK_SIZE + samd_flash_obj.flash_base);
            // TODO check return value
            return MP_OBJ_NEW_SMALL_INT(0);
        }
        default:
            return mp_const_none;
    }
}
static MP_DEFINE_CONST_FUN_OBJ_3(samd_flash_ioctl_obj, samd_flash_ioctl);

static const mp_rom_map_elem_t samd_flash_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR_flash_version), MP_ROM_PTR(&samd_flash_version_obj) },
    { MP_ROM_QSTR(MP_QSTR_readblocks), MP_ROM_PTR(&samd_flash_readblocks_obj) },
    { MP_ROM_QSTR(MP_QSTR_writeblocks), MP_ROM_PTR(&samd_flash_writeblocks_obj) },
    { MP_ROM_QSTR(MP_QSTR_ioctl), MP_ROM_PTR(&samd_flash_ioctl_obj) },
};
static MP_DEFINE_CONST_DICT(samd_flash_locals_dict, samd_flash_locals_dict_table);

MP_DEFINE_CONST_OBJ_TYPE(
    samd_flash_type,
    MP_QSTR_Flash,
    MP_TYPE_FLAG_NONE,
    make_new, samd_flash_make_new,
    buffer, samd_flash_get_buffer,
    locals_dict, &samd_flash_locals_dict
    );
#endif

#if MICROPY_VFS_ROM
//
// Uses object-based capabilities for devices using the internal flash
// for the regular file system and ioctl function for devices with
// external flash.
//
extern uint8_t _micropy_hw_romfs_part0_start, _micropy_hw_romfs_part0_size;

#define MICROPY_HW_ROMFS_BASE ((uint32_t)&_micropy_hw_romfs_part0_start)
#define MICROPY_HW_ROMFS_BYTES ((uint32_t)&_micropy_hw_romfs_part0_size)

#if MICROPY_HW_MCUFLASH
static samd_flash_obj_t samd_flash_romfs_obj = {
    .base = { &samd_flash_type },
    .flash_base = MICROPY_HW_ROMFS_BASE, // Get from MCU-Specific loader script.
    .flash_size = MICROPY_HW_ROMFS_BYTES, // Get from MCU-Specific loader script.
};
#else
static const MP_DEFINE_MEMORYVIEW_OBJ(samd_flash_romfs_obj, 'B', 0, MICROPY_HW_ROMFS_BYTES, (void *)MICROPY_HW_ROMFS_BASE);
#endif

mp_obj_t mp_vfs_rom_ioctl(size_t n_args, const mp_obj_t *args) {
    if (MICROPY_HW_ROMFS_BYTES <= 0) {
        return MP_OBJ_NEW_SMALL_INT(-MP_EINVAL);
    }
    switch (mp_obj_get_int(args[0])) {
        case MP_VFS_ROM_IOCTL_GET_NUMBER_OF_SEGMENTS:
            return MP_OBJ_NEW_SMALL_INT(1);

        case MP_VFS_ROM_IOCTL_GET_SEGMENT:
            return MP_OBJ_FROM_PTR(&samd_flash_romfs_obj);

            #if !MICROPY_HW_MCUFLASH

        case MP_VFS_ROM_IOCTL_WRITE_PREPARE: {
            // Erase sectors in given range.
            if (n_args < 3) {
                return MP_OBJ_NEW_SMALL_INT(-MP_EINVAL);
            }
            uint32_t dest_addr = MICROPY_HW_ROMFS_BASE;
            uint32_t bytes_used;
            if (n_args == 3) {
                // Only length given, offset defaults to start of partition.
                bytes_used = mp_obj_get_int(args[2]);
            } else {
                // Both offset and length given.
                dest_addr += mp_obj_get_int(args[2]);
                bytes_used = mp_obj_get_int(args[3]);
            }
            mp_int_t page_size = flash_get_page_size(&flash_desc); // adf4 API call
            flash_erase(&flash_desc, dest_addr, (bytes_used + page_size - 1) / page_size);
            return MP_OBJ_NEW_SMALL_INT(4);
        }

        case MP_VFS_ROM_IOCTL_WRITE: {
            // Write data to flash.
            if (n_args < 4) {
                return MP_OBJ_NEW_SMALL_INT(-MP_EINVAL);
            }
            uint32_t dest_addr = MICROPY_HW_ROMFS_BASE + mp_obj_get_int(args[2]);
            mp_buffer_info_t bufinfo;
            mp_get_buffer_raise(args[3], &bufinfo, MP_BUFFER_READ);
            flash_write(&flash_desc, dest_addr, bufinfo.buf, bufinfo.len);
            return MP_OBJ_NEW_SMALL_INT(0);
        }

        case MP_VFS_ROM_IOCTL_GET_MIN_PREPARE: {
            // Get minimum erase size.
            return MP_OBJ_NEW_SMALL_INT(flash_get_page_size(&flash_desc));
        }

            #endif

        default:
            return MP_OBJ_NEW_SMALL_INT(-MP_EINVAL);
    }
}
#endif

#endif  // MICROPY_HW_MCUFLASH || MICROPY_VFS_ROM
