// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <stdlib.h>
#include "spi_flash_chip_generic.h"
#include "spi_flash_defs.h"

#define FLASH_ID_MASK       0xFF00
#define FLASH_SIZE_MASK     0xFF
#define GD25Q_PRODUCT_ID    0x4000
#define GD25LQ_PRODUCT_ID   0x6000

#define WRSR_16B_REQUIRED(chip_id) (((chip_id) & FLASH_ID_MASK) == GD25LQ_PRODUCT_ID || \
                                    ((chip_id) & FLASH_SIZE_MASK) <= 0x15)

/* Driver for GD flash chip */

esp_err_t spi_flash_chip_gd_probe(esp_flash_t *chip, uint32_t flash_id)
{
    /* Check manufacturer and product IDs match our desired masks */
    const uint8_t MFG_ID = 0xC8;
    if (flash_id >> 16 != MFG_ID) {
        return ESP_ERR_NOT_FOUND;
    }

    uint32_t product_id = flash_id & FLASH_ID_MASK;
    if (product_id != GD25Q_PRODUCT_ID && product_id != GD25LQ_PRODUCT_ID) {
        return ESP_ERR_NOT_FOUND;
    }

    return ESP_OK;
}

esp_err_t spi_flash_chip_gd_set_io_mode(esp_flash_t *chip)
{
    if (WRSR_16B_REQUIRED(chip->chip_id)) {
        const uint32_t qe = 1<<9;
        return spi_flash_common_set_io_mode(chip,
                                            spi_flash_common_write_status_16b_wrsr,
                                            spi_flash_common_read_status_16b_rdsr_rdsr2,
                                            qe);
    } else {
        const uint32_t qe = 1<<1;
        return spi_flash_common_set_io_mode(chip,
                                            spi_flash_common_write_status_8b_wrsr2,
                                            spi_flash_common_read_status_8b_rdsr2,
                                            qe);
    }
}

esp_err_t spi_flash_chip_gd_get_io_mode(esp_flash_t *chip, esp_flash_io_mode_t* out_io_mode)
{
    /* GD uses bit 1 of SR2 as Quad Enable */
    const uint8_t BIT_QE = 1 << 1;
    uint32_t sr;
    esp_err_t ret = spi_flash_common_read_status_8b_rdsr2(chip, &sr);
    if (ret == ESP_OK) {
        *out_io_mode = ((sr & BIT_QE)? SPI_FLASH_QOUT: 0);
    }
    return ret;
}


static const char chip_name[] = "gd";

// The issi chip can use the functions for generic chips except from set read mode and probe,
// So we only replace these two functions.
const spi_flash_chip_t esp_flash_chip_gd = {
    .name = chip_name,
    .timeout = &spi_flash_chip_generic_timeout,
    .probe = spi_flash_chip_gd_probe,
    .reset = spi_flash_chip_generic_reset,
    .detect_size = spi_flash_chip_generic_detect_size,
    .erase_chip = spi_flash_chip_generic_erase_chip,
    .erase_sector = spi_flash_chip_generic_erase_sector,
    .erase_block = spi_flash_chip_generic_erase_block,
    .sector_size = 4 * 1024,
    .block_erase_size = 64 * 1024,

    .get_chip_write_protect = spi_flash_chip_generic_get_write_protect,
    .set_chip_write_protect = spi_flash_chip_generic_set_write_protect,

    // TODO support protected regions on ISSI flash
    .num_protectable_regions = 0,
    .protectable_regions = NULL,
    .get_protected_regions = NULL,
    .set_protected_regions = NULL,

    .read = spi_flash_chip_generic_read,
    .write = spi_flash_chip_generic_write,
    .program_page = spi_flash_chip_generic_page_program,
    .page_size = 256,
    .write_encrypted = spi_flash_chip_generic_write_encrypted,

    .wait_idle = spi_flash_chip_generic_wait_idle,
    .set_io_mode = spi_flash_chip_gd_set_io_mode,
    .get_io_mode = spi_flash_chip_gd_get_io_mode,
};
