esp-idf/components/driver/include/driver/spi_common_internal.h

// Copyright 2010-2019 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.

// Internal header, don't use it in the user code

#pragma once

#include "driver/spi_common.h"

#ifdef __cplusplus
extern "C"
{
#endif


/**
 * @brief Try to claim a SPI peripheral
 *
 * Call this if your driver wants to manage a SPI peripheral.
 *
 * @param host Peripheral to claim
 * @param source The caller indentification string.
 *
 * @note This public API is deprecated.
 *
 * @return True if peripheral is claimed successfully; false if peripheral already is claimed.
 */
bool spicommon_periph_claim(spi_host_device_t host, const char* source);

/**
 * @brief Check whether the spi periph is in use.
 *
 * @param host Peripheral to check.
 *
 * @note This public API is deprecated.
 *
 * @return True if in use, otherwise false.
 */
bool spicommon_periph_in_use(spi_host_device_t host);

/**
 * @brief Return the SPI peripheral so another driver can claim it.
 *
 * @param host Peripheral to return
 *
 * @note This public API is deprecated.
 *
 * @return True if peripheral is returned successfully; false if peripheral was free to claim already.
 */
bool spicommon_periph_free(spi_host_device_t host);

/**
 * @brief Try to claim a SPI DMA channel
 *
 *  Call this if your driver wants to use SPI with a DMA channnel.
 *
 * @param dma_chan channel to claim
 *
 * @note This public API is deprecated.
 *
 * @return True if success; false otherwise.
 */
bool spicommon_dma_chan_claim(int dma_chan);

/**
 * @brief Check whether the spi DMA channel is in use.
 *
 * @param dma_chan DMA channel to check.
 *
 * @note This public API is deprecated.
 *
 * @return True if in use, otherwise false.
 */
bool spicommon_dma_chan_in_use(int dma_chan);

/**
 * @brief Return the SPI DMA channel so other driver can claim it, or just to power down DMA.
 *
 * @param dma_chan channel to return
 *
 * @note This public API is deprecated.
 *
 * @return True if success; false otherwise.
 */
bool spicommon_dma_chan_free(int dma_chan);

/**
 * @brief Connect a SPI peripheral to GPIO pins
 *
 * This routine is used to connect a SPI peripheral to the IO-pads and DMA channel given in
 * the arguments. Depending on the IO-pads requested, the routing is done either using the
 * IO_mux or using the GPIO matrix.
 *
 * @note This public API is deprecated. Please call ``spi_bus_initialize`` for master
 *       bus initialization and ``spi_slave_initialize`` for slave initialization.
 *
 * @param host SPI peripheral to be routed
 * @param bus_config Pointer to a spi_bus_config struct detailing the GPIO pins
 * @param dma_chan DMA-channel (1 or 2) to use, or 0 for no DMA.
 * @param flags Combination of SPICOMMON_BUSFLAG_* flags, set to ensure the pins set are capable with some functions:
 *              - ``SPICOMMON_BUSFLAG_MASTER``: Initialize I/O in master mode
 *              - ``SPICOMMON_BUSFLAG_SLAVE``: Initialize I/O in slave mode
 *              - ``SPICOMMON_BUSFLAG_IOMUX_PINS``: Pins set should match the iomux pins of the controller.
 *              - ``SPICOMMON_BUSFLAG_SCLK``, ``SPICOMMON_BUSFLAG_MISO``, ``SPICOMMON_BUSFLAG_MOSI``:
 *                  Make sure SCLK/MISO/MOSI is/are set to a valid GPIO. Also check output capability according to the mode.
 *              - ``SPICOMMON_BUSFLAG_DUAL``: Make sure both MISO and MOSI are output capable so that DIO mode is capable.
 *              - ``SPICOMMON_BUSFLAG_WPHD`` Make sure WP and HD are set to valid output GPIOs.
 *              - ``SPICOMMON_BUSFLAG_QUAD``: Combination of ``SPICOMMON_BUSFLAG_DUAL`` and ``SPICOMMON_BUSFLAG_WPHD``.
 * @param[out] flags_o A SPICOMMON_BUSFLAG_* flag combination of bus abilities will be written to this address.
 *              Leave to NULL if not needed.
 *              - ``SPICOMMON_BUSFLAG_IOMUX_PINS``: The bus is connected to iomux pins.
 *              - ``SPICOMMON_BUSFLAG_SCLK``, ``SPICOMMON_BUSFLAG_MISO``, ``SPICOMMON_BUSFLAG_MOSI``: The bus has
 *                  CLK/MISO/MOSI connected.
 *              - ``SPICOMMON_BUSFLAG_DUAL``: The bus is capable with DIO mode.
 *              - ``SPICOMMON_BUSFLAG_WPHD`` The bus has WP and HD connected.
 *              - ``SPICOMMON_BUSFLAG_QUAD``: Combination of ``SPICOMMON_BUSFLAG_DUAL`` and ``SPICOMMON_BUSFLAG_WPHD``.
 * @return
 *         - ESP_ERR_INVALID_ARG   if parameter is invalid
 *         - ESP_OK                on success
 */
esp_err_t spicommon_bus_initialize_io(spi_host_device_t host, const spi_bus_config_t *bus_config, int dma_chan, uint32_t flags, uint32_t *flags_o);

/**
 * @brief Free the IO used by a SPI peripheral
 *
 * @note This public API is deprecated. Please call ``spi_bus_free`` for master
 *       bus deinitialization and ``spi_slave_free`` for slave deinitialization.
 *
 * @param bus_cfg Bus config struct which defines which pins to be used.
 *
 * @return
 *         - ESP_ERR_INVALID_ARG   if parameter is invalid
 *         - ESP_OK                on success
 */
esp_err_t spicommon_bus_free_io_cfg(const spi_bus_config_t *bus_cfg);

/**
 * @brief Initialize a Chip Select pin for a specific SPI peripheral
 *
 * @note This public API is deprecated. Please call corresponding device initialization
 *       functions.
 *
 * @param host SPI peripheral
 * @param cs_io_num GPIO pin to route
 * @param cs_num CS id to route
 * @param force_gpio_matrix If true, CS will always be routed through the GPIO matrix. If false,
 *                          if the GPIO number allows it, the routing will happen through the IO_mux.
 */
void spicommon_cs_initialize(spi_host_device_t host, int cs_io_num, int cs_num, int force_gpio_matrix);

/**
 * @brief Free a chip select line
 *
 * @param cs_gpio_num CS gpio num to free
 *
 * @note This public API is deprecated.
 */
void spicommon_cs_free_io(int cs_gpio_num);

/**
 * @brief Check whether all pins used by a host are through IOMUX.
 *
 * @param host SPI peripheral
 *
 * @note This public API is deprecated.
 *
 * @return false if any pins are through the GPIO matrix, otherwise true.
 */
bool spicommon_bus_using_iomux(spi_host_device_t host);

/**
 * @brief Get the IRQ source for a specific SPI host
 *
 * @param host The SPI host
 *
 * @note This public API is deprecated.
 *
 * @return The hosts IRQ source
 */
int spicommon_irqsource_for_host(spi_host_device_t host);

/**
 * @brief Get the IRQ source for a specific SPI DMA
 *
 * @param host The SPI host
 *
 * @note This public API is deprecated.
 *
 * @return The hosts IRQ source
 */
int spicommon_irqdma_source_for_host(spi_host_device_t host);

/**
 * Callback, to be called when a DMA engine reset is completed
*/
typedef void(*dmaworkaround_cb_t)(void *arg);


/**
 * @brief Request a reset for a certain DMA channel
 *
 * @note In some (well-defined) cases in the ESP32 (at least rev v.0 and v.1), a SPI DMA channel will get confused. This can be remedied
 * by resetting the SPI DMA hardware in case this happens. Unfortunately, the reset knob used for thsi will reset _both_ DMA channels, and
 * as such can only done safely when both DMA channels are idle. These functions coordinate this.
 *
 * Essentially, when a reset is needed, a driver can request this using spicommon_dmaworkaround_req_reset. This is supposed to be called
 * with an user-supplied function as an argument. If both DMA channels are idle, this call will reset the DMA subsystem and return true.
 * If the other DMA channel is still busy, it will return false; as soon as the other DMA channel is done, however, it will reset the
 * DMA subsystem and call the callback. The callback is then supposed to be used to continue the SPI drivers activity.
 *
 * @param dmachan DMA channel associated with the SPI host that needs a reset
 * @param cb Callback to call in case DMA channel cannot be reset immediately
 * @param arg Argument to the callback
 *
 * @note This public API is deprecated.
 *
 * @return True when a DMA reset could be executed immediately. False when it could not; in this
 *         case the callback will be called with the specified argument when the logic can execute
 *         a reset, after that reset.
 */
bool spicommon_dmaworkaround_req_reset(int dmachan, dmaworkaround_cb_t cb, void *arg);


/**
 * @brief Check if a DMA reset is requested but has not completed yet
 *
 * @note This public API is deprecated.
 *
 * @return True when a DMA reset is requested but hasn't completed yet. False otherwise.
 */
bool spicommon_dmaworkaround_reset_in_progress(void);


/**
 * @brief Mark a DMA channel as idle.
 *
 * A call to this function tells the workaround logic that this channel will
 * not be affected by a global SPI DMA reset.
 *
 * @note This public API is deprecated.
 */
void spicommon_dmaworkaround_idle(int dmachan);

/**
 * @brief Mark a DMA channel as active.
 *
 * A call to this function tells the workaround logic that this channel will
 * be affected by a global SPI DMA reset, and a reset like that should not be attempted.
 *
 * @note This public API is deprecated.
 */
void spicommon_dmaworkaround_transfer_active(int dmachan);

#ifdef __cplusplus
}
#endif