// 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 "sdkconfig.h"
#include "esp_flash.h"
#include "memspi_host_driver.h"
#include "esp_flash_spi_init.h"
#include "driver/gpio.h"
#include "esp32/rom/spi_flash.h"
#include "esp_log.h"
#include "esp_heap_caps.h"
#include "hal/spi_types.h"
#include "driver/spi_common_internal.h"
#include "esp_flash_internal.h"

__attribute__((unused)) static const char TAG[] = "spi_flash";

#ifdef CONFIG_ESPTOOLPY_FLASHFREQ_80M
#define DEFAULT_FLASH_SPEED ESP_FLASH_80MHZ
#elif defined CONFIG_ESPTOOLPY_FLASHFREQ_40M
#define DEFAULT_FLASH_SPEED ESP_FLASH_40MHZ
#elif defined CONFIG_ESPTOOLPY_FLASHFREQ_26M
#define DEFAULT_FLASH_SPEED ESP_FLASH_26MHZ
#elif defined CONFIG_ESPTOOLPY_FLASHFREQ_20M
#define DEFAULT_FLASH_SPEED ESP_FLASH_20MHZ
#else
#error Flash frequency not defined! Check the ``CONFIG_ESPTOOLPY_FLASHFREQ_*`` options.
#endif

#if defined(CONFIG_ESPTOOLPY_FLASHMODE_QIO)
#define DEFAULT_FLASH_MODE  SPI_FLASH_QIO
#elif defined(CONFIG_ESPTOOLPY_FLASHMODE_QOUT)
#define DEFAULT_FLASH_MODE  SPI_FLASH_QOUT
#elif defined(CONFIG_ESPTOOLPY_FLASHMODE_DIO)
#define DEFAULT_FLASH_MODE  SPI_FLASH_DIO
#elif defined(CONFIG_ESPTOOLPY_FLASHMODE_DOUT)
#define DEFAULT_FLASH_MODE  SPI_FLASH_DOUT
#else
#define DEFAULT_FLASH_MODE SPI_FLASH_FASTRD
#endif

#if CONFIG_IDF_TARGET_ESP32
#define ESP_FLASH_HOST_CONFIG_DEFAULT()  (memspi_host_config_t){ \
    .host_id = SPI_HOST,\
    .speed = DEFAULT_FLASH_SPEED, \
    .cs_num = 0, \
    .iomux = false, \
    .input_delay_ns = 0,\
}
#elif CONFIG_IDF_TARGET_ESP32S2
#include "esp32s2/rom/efuse.h"
#define ESP_FLASH_HOST_CONFIG_DEFAULT()  (memspi_host_config_t){ \
    .host_id = SPI_HOST,\
    .speed = DEFAULT_FLASH_SPEED, \
    .cs_num = 0, \
    .iomux = true, \
    .input_delay_ns = 0,\
}
#endif


esp_flash_t *esp_flash_default_chip = NULL;


static IRAM_ATTR NOINLINE_ATTR void cs_initialize(esp_flash_t *chip, const esp_flash_spi_device_config_t *config, bool use_iomux, int cs_id)
{
    //Not using spicommon_cs_initialize since we don't want to put the whole
    //spi_periph_signal into the DRAM. Copy these data from flash before the
    //cache disabling
    int cs_io_num = config->cs_io_num;
    int spics_in = spi_periph_signal[config->host_id].spics_in;
    int spics_out = spi_periph_signal[config->host_id].spics_out[cs_id];
    int spics_func = spi_periph_signal[config->host_id].func;
    uint32_t iomux_reg = GPIO_PIN_MUX_REG[cs_io_num];

    //To avoid the panic caused by flash data line conflicts during cs line
    //initialization, disable the cache temporarily
    chip->os_func->start(chip->os_func_data);
    if (use_iomux) {
        // This requires `gpio_iomux_in` and `gpio_iomux_out` to be in the IRAM.
        // `linker.lf` is used fulfill this requirement.
        gpio_iomux_in(cs_io_num, spics_in);
        gpio_iomux_out(cs_io_num, spics_func, false);
    } else {
        PIN_INPUT_ENABLE(iomux_reg);
        if (cs_io_num < 32) {
            GPIO.enable_w1ts = (0x1 << cs_io_num);
        } else {
            GPIO.enable1_w1ts.data = (0x1 << (cs_io_num - 32));
        }
        GPIO.pin[cs_io_num].pad_driver = 0;
        gpio_matrix_out(cs_io_num, spics_out, false, false);
        if (cs_id == 0) {
            gpio_matrix_in(cs_io_num, spics_in, false);
        }
        PIN_FUNC_SELECT(iomux_reg, PIN_FUNC_GPIO);
    }
    chip->os_func->end(chip->os_func_data);
}

esp_err_t spi_bus_add_flash_device(esp_flash_t **out_chip, const esp_flash_spi_device_config_t *config)
{
    if (out_chip == NULL) {
        return ESP_ERR_INVALID_ARG;
    }
    esp_flash_t *chip = NULL;
    spi_flash_host_driver_t *host = NULL;
    memspi_host_data_t *host_data = NULL;
    esp_err_t ret = ESP_OK;

    uint32_t caps = MALLOC_CAP_DEFAULT;
    if (config->host_id == SPI_HOST) caps = MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT;

    chip = (esp_flash_t*)heap_caps_malloc(sizeof(esp_flash_t), caps);
    if (!chip) {
        ret = ESP_ERR_NO_MEM;
        goto fail;
    }

    host = (spi_flash_host_driver_t*)heap_caps_malloc(sizeof(spi_flash_host_driver_t), caps);
    *chip = (esp_flash_t) {
        .read_mode = config->io_mode,
        .host = host,
    };
    if (!host) {
        ret = ESP_ERR_NO_MEM;
        goto fail;
    }

    host_data = (memspi_host_data_t*)heap_caps_malloc(sizeof(memspi_host_data_t), caps);
    host->driver_data = host_data;
    if (!host_data) {
        ret = ESP_ERR_NO_MEM;
        goto fail;
    }

    int dev_id;
    esp_err_t err = esp_flash_init_os_functions(chip, config->host_id, &dev_id);
    if (err != ESP_OK) {
        ret = err;
        goto fail;
    }
    assert(dev_id < SOC_SPI_PERIPH_CS_NUM(config->host_id) && dev_id >= 0);

    bool use_iomux = spicommon_bus_using_iomux(config->host_id);
    memspi_host_config_t host_cfg = {
        .host_id = config->host_id,
        .cs_num = dev_id,
        .iomux = use_iomux,
        .input_delay_ns = config->input_delay_ns,
        .speed = config->speed,
    };
    err = memspi_host_init_pointers(host, host_data, &host_cfg);
    if (err != ESP_OK) {
        ret = err;
        goto fail;
    }

    // The cs_id inside `config` is deprecated, use the `dev_id` provided by the bus lock instead.
    cs_initialize(chip, config, use_iomux, dev_id);
    *out_chip = chip;
    return ret;
fail:
    // The memory allocated are free'd in the `spi_bus_remove_flash_device`.
    spi_bus_remove_flash_device(chip);
    return ret;
}

esp_err_t spi_bus_remove_flash_device(esp_flash_t *chip)
{
    if (chip==NULL) {
        return ESP_ERR_INVALID_ARG;
    }
    esp_flash_deinit_os_functions(chip);
    if (chip->host) {
        free(chip->host->driver_data);
        free(chip->host);
    }
    free(chip);
    return ESP_OK;
}


/* The default (ie initial boot) no-OS ROM esp_flash_os_functions_t */
extern const esp_flash_os_functions_t esp_flash_noos_functions;

#ifndef CONFIG_SPI_FLASH_USE_LEGACY_IMPL

static DRAM_ATTR memspi_host_data_t default_driver_data;
static DRAM_ATTR spi_flash_host_driver_t esp_flash_default_host_drv = ESP_FLASH_DEFAULT_HOST_DRIVER();


static DRAM_ATTR esp_flash_t default_chip = {
    .read_mode = DEFAULT_FLASH_MODE,
    .host = &esp_flash_default_host_drv,
    .os_func = &esp_flash_noos_functions,
};

esp_err_t esp_flash_init_default_chip(void)
{
    memspi_host_config_t cfg = ESP_FLASH_HOST_CONFIG_DEFAULT();

    #ifdef CONFIG_IDF_TARGET_ESP32S2
    // For esp32s2 spi IOs are configured as from IO MUX by default
    cfg.iomux = ets_efuse_get_spiconfig() == 0 ?  true : false;
    #endif

    //the host is already initialized, only do init for the data and load it to the host
    spi_flash_hal_init(&default_driver_data, &cfg);
    default_chip.host->driver_data = &default_driver_data;

    // ROM TODO: account for non-standard default pins in efuse
    // ROM TODO: to account for chips which are slow to power on, maybe keep probing in a loop here
    esp_err_t err = esp_flash_init(&default_chip);
    if (err != ESP_OK) {
        return err;
    }
    if (default_chip.size < g_rom_flashchip.chip_size) {
        ESP_EARLY_LOGE(TAG, "Detected size(%dk) smaller than the size in the binary image header(%dk). Probe failed.", default_chip.size/1024, g_rom_flashchip.chip_size/1024);
        return ESP_ERR_FLASH_SIZE_NOT_MATCH;
    } else if (default_chip.size > g_rom_flashchip.chip_size) {
        ESP_EARLY_LOGW(TAG, "Detected size(%dk) larger than the size in the binary image header(%dk). Using the size in the binary image header.", default_chip.size/1024, g_rom_flashchip.chip_size/1024);
        default_chip.size = g_rom_flashchip.chip_size;
    }
    default_chip.size = g_rom_flashchip.chip_size;

    esp_flash_default_chip = &default_chip;
    return ESP_OK;
}

esp_err_t esp_flash_app_init(void)
{
    return esp_flash_app_init_os_functions(&default_chip);
}

#endif