sw/device/lib/dif/autogen/dif_i2c_autogen.h

// Copyright lowRISC contributors.
// Licensed under the Apache License, Version 2.0, see LICENSE for details.
// SPDX-License-Identifier: Apache-2.0

#ifndef OPENTITAN_SW_DEVICE_LIB_DIF_AUTOGEN_DIF_I2C_AUTOGEN_H_
#define OPENTITAN_SW_DEVICE_LIB_DIF_AUTOGEN_DIF_I2C_AUTOGEN_H_

// This file is auto-generated.

/**
 * @file
 * @brief <a href="/hw/ip/i2c/doc/">I2C</a> Device Interface Functions
 */

#include <stdbool.h>
#include <stdint.h>

#include "sw/device/lib/base/macros.h"
#include "sw/device/lib/base/mmio.h"
#include "sw/device/lib/dif/dif_base.h"

#ifdef __cplusplus
extern "C" {
#endif  // __cplusplus

/**
 * A handle to i2c.
 *
 * This type should be treated as opaque by users.
 */
typedef struct dif_i2c {
  /**
   * The base address for the i2c hardware registers.
   */
  mmio_region_t base_addr;
} dif_i2c_t;

/**
 * Creates a new handle for a(n) i2c peripheral.
 *
 * This function does not actuate the hardware.
 *
 * @param base_addr The MMIO base address of the i2c peripheral.
 * @param[out] i2c Out param for the initialized handle.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_init(mmio_region_t base_addr, dif_i2c_t *i2c);

/**
 * A i2c interrupt request type.
 */
typedef enum dif_i2c_irq {
  /**
   * Raised when the FMT FIFO depth falls below the low watermark.
   */
  kDifI2cIrqFmtWatermark = 0,
  /**
   * Raised if the RX FIFO is past the high watermark.
   */
  kDifI2cIrqRxWatermark = 1,
  /**
   * Raised if the FMT FIFO has overflowed.
   */
  kDifI2cIrqFmtOverflow = 2,
  /**
   * Raised if the RX FIFO has overflowed.
   */
  kDifI2cIrqRxOverflow = 3,
  /**
   * Raised if there is no ACK in response to an address or data write
   */
  kDifI2cIrqNak = 4,
  /**
   * Raised if the SCL line drops early (not supported without clock
   * synchronization).
   */
  kDifI2cIrqSclInterference = 5,
  /**
   * Raised if the SDA line goes low when host is trying to assert high
   */
  kDifI2cIrqSdaInterference = 6,
  /**
   * Raised if target stretches the clock beyond the allowed timeout period
   */
  kDifI2cIrqStretchTimeout = 7,
  /**
   * Raised if the target does not assert a constant value of SDA during
   * transmission.
   */
  kDifI2cIrqSdaUnstable = 8,
  /**
   * Raised if the host terminates the transaction by issuing STOP or repeated
   * START.
   */
  kDifI2cIrqTransComplete = 9,
  /**
   * Raised if the target needs data to transmit and TX FIFO is empty.
   */
  kDifI2cIrqTxEmpty = 10,
  /**
   * Raised if there are extra bytes left in TX FIFO at the end of a read.
   */
  kDifI2cIrqTxNonempty = 11,
  /**
   * Raised if TX FIFO has overflowed.
   */
  kDifI2cIrqTxOverflow = 12,
  /**
   * Raised if ACQ FIFO has overflowed.
   */
  kDifI2cIrqAcqOverflow = 13,
  /**
   * Raised if STOP is received after ACK (host sends both signals).
   */
  kDifI2cIrqAckStop = 14,
  /**
   * Raised if the host stops sending the clock during an ongoing transaction.
   */
  kDifI2cIrqHostTimeout = 15,
} dif_i2c_irq_t;

/**
 * A snapshot of the state of the interrupts for this IP.
 *
 * This is an opaque type, to be used with the `dif_i2c_irq_get_state()`
 * function.
 */
typedef uint32_t dif_i2c_irq_state_snapshot_t;

/**
 * Returns the state of all interrupts (i.e., pending or not) for this IP.
 *
 * @param i2c A i2c handle.
 * @param[out] snapshot Out-param for interrupt state snapshot.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_get_state(const dif_i2c_t *i2c,
                                   dif_i2c_irq_state_snapshot_t *snapshot);

/**
 * Returns whether a particular interrupt is currently pending.
 *
 * @param i2c A i2c handle.
 * @param irq An interrupt request.
 * @param[out] is_pending Out-param for whether the interrupt is pending.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_is_pending(const dif_i2c_t *i2c, dif_i2c_irq_t irq,
                                    bool *is_pending);

/**
 * Acknowledges all interrupts, indicating to the hardware that all
 * interrupts have been successfully serviced.
 *
 * @param i2c A i2c handle.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_acknowledge_all(const dif_i2c_t *i2c);

/**
 * Acknowledges a particular interrupt, indicating to the hardware that it has
 * been successfully serviced.
 *
 * @param i2c A i2c handle.
 * @param irq An interrupt request.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_acknowledge(const dif_i2c_t *i2c, dif_i2c_irq_t irq);

/**
 * Forces a particular interrupt, causing it to be serviced as if hardware had
 * asserted it.
 *
 * @param i2c A i2c handle.
 * @param irq An interrupt request.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_force(const dif_i2c_t *i2c, dif_i2c_irq_t irq);

/**
 * A snapshot of the enablement state of the interrupts for this IP.
 *
 * This is an opaque type, to be used with the
 * `dif_i2c_irq_disable_all()` and `dif_i2c_irq_restore_all()`
 * functions.
 */
typedef uint32_t dif_i2c_irq_enable_snapshot_t;

/**
 * Checks whether a particular interrupt is currently enabled or disabled.
 *
 * @param i2c A i2c handle.
 * @param irq An interrupt request.
 * @param[out] state Out-param toggle state of the interrupt.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_get_enabled(const dif_i2c_t *i2c, dif_i2c_irq_t irq,
                                     dif_toggle_t *state);

/**
 * Sets whether a particular interrupt is currently enabled or disabled.
 *
 * @param i2c A i2c handle.
 * @param irq An interrupt request.
 * @param state The new toggle state for the interrupt.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_set_enabled(const dif_i2c_t *i2c, dif_i2c_irq_t irq,
                                     dif_toggle_t state);

/**
 * Disables all interrupts, optionally snapshotting all enable states for later
 * restoration.
 *
 * @param i2c A i2c handle.
 * @param[out] snapshot Out-param for the snapshot; may be `NULL`.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_disable_all(const dif_i2c_t *i2c,
                                     dif_i2c_irq_enable_snapshot_t *snapshot);

/**
 * Restores interrupts from the given (enable) snapshot.
 *
 * @param i2c A i2c handle.
 * @param snapshot A snapshot to restore from.
 * @return The result of the operation.
 */
OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_restore_all(
    const dif_i2c_t *i2c, const dif_i2c_irq_enable_snapshot_t *snapshot);

#ifdef __cplusplus
}  // extern "C"
#endif  // __cplusplus

#endif  // OPENTITAN_SW_DEVICE_LIB_DIF_AUTOGEN_DIF_I2C_AUTOGEN_H_