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

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

// This file is auto-generated.

#include "sw/device/lib/dif/autogen/dif_i2c_autogen.h"
#include <stdint.h>

#include "i2c_regs.h"  // Generated.

OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_init(mmio_region_t base_addr, dif_i2c_t *i2c) {
  if (i2c == NULL) {
    return kDifBadArg;
  }

  i2c->base_addr = base_addr;

  return kDifOk;
}

/**
 * Get the corresponding interrupt register bit offset of the IRQ. If the IP's
 * HJSON does NOT have a field "no_auto_intr_regs = true", then the
 * "<ip>_INTR_COMMON_<irq>_BIT" macro can be used. Otherwise, special cases
 * will exist, as templated below.
 */
static bool i2c_get_irq_bit_index(dif_i2c_irq_t irq,
                                  bitfield_bit32_index_t *index_out) {
  switch (irq) {
    case kDifI2cIrqFmtWatermark:
      *index_out = I2C_INTR_COMMON_FMT_WATERMARK_BIT;
      break;
    case kDifI2cIrqRxWatermark:
      *index_out = I2C_INTR_COMMON_RX_WATERMARK_BIT;
      break;
    case kDifI2cIrqFmtOverflow:
      *index_out = I2C_INTR_COMMON_FMT_OVERFLOW_BIT;
      break;
    case kDifI2cIrqRxOverflow:
      *index_out = I2C_INTR_COMMON_RX_OVERFLOW_BIT;
      break;
    case kDifI2cIrqNak:
      *index_out = I2C_INTR_COMMON_NAK_BIT;
      break;
    case kDifI2cIrqSclInterference:
      *index_out = I2C_INTR_COMMON_SCL_INTERFERENCE_BIT;
      break;
    case kDifI2cIrqSdaInterference:
      *index_out = I2C_INTR_COMMON_SDA_INTERFERENCE_BIT;
      break;
    case kDifI2cIrqStretchTimeout:
      *index_out = I2C_INTR_COMMON_STRETCH_TIMEOUT_BIT;
      break;
    case kDifI2cIrqSdaUnstable:
      *index_out = I2C_INTR_COMMON_SDA_UNSTABLE_BIT;
      break;
    case kDifI2cIrqTransComplete:
      *index_out = I2C_INTR_COMMON_TRANS_COMPLETE_BIT;
      break;
    case kDifI2cIrqTxEmpty:
      *index_out = I2C_INTR_COMMON_TX_EMPTY_BIT;
      break;
    case kDifI2cIrqTxNonempty:
      *index_out = I2C_INTR_COMMON_TX_NONEMPTY_BIT;
      break;
    case kDifI2cIrqTxOverflow:
      *index_out = I2C_INTR_COMMON_TX_OVERFLOW_BIT;
      break;
    case kDifI2cIrqAcqOverflow:
      *index_out = I2C_INTR_COMMON_ACQ_OVERFLOW_BIT;
      break;
    case kDifI2cIrqAckStop:
      *index_out = I2C_INTR_COMMON_ACK_STOP_BIT;
      break;
    case kDifI2cIrqHostTimeout:
      *index_out = I2C_INTR_COMMON_HOST_TIMEOUT_BIT;
      break;
    default:
      return false;
  }

  return true;
}

OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_get_state(const dif_i2c_t *i2c,
                                   dif_i2c_irq_state_snapshot_t *snapshot) {
  if (i2c == NULL || snapshot == NULL) {
    return kDifBadArg;
  }

  *snapshot = mmio_region_read32(i2c->base_addr, I2C_INTR_STATE_REG_OFFSET);

  return kDifOk;
}

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) {
  if (i2c == NULL || is_pending == NULL) {
    return kDifBadArg;
  }

  bitfield_bit32_index_t index;
  if (!i2c_get_irq_bit_index(irq, &index)) {
    return kDifBadArg;
  }

  uint32_t intr_state_reg =
      mmio_region_read32(i2c->base_addr, I2C_INTR_STATE_REG_OFFSET);

  *is_pending = bitfield_bit32_read(intr_state_reg, index);

  return kDifOk;
}

OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_acknowledge_all(const dif_i2c_t *i2c) {
  if (i2c == NULL) {
    return kDifBadArg;
  }

  // Writing to the register clears the corresponding bits (Write-one clear).
  mmio_region_write32(i2c->base_addr, I2C_INTR_STATE_REG_OFFSET, UINT32_MAX);

  return kDifOk;
}

OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_acknowledge(const dif_i2c_t *i2c, dif_i2c_irq_t irq) {
  if (i2c == NULL) {
    return kDifBadArg;
  }

  bitfield_bit32_index_t index;
  if (!i2c_get_irq_bit_index(irq, &index)) {
    return kDifBadArg;
  }

  // Writing to the register clears the corresponding bits (Write-one clear).
  uint32_t intr_state_reg = bitfield_bit32_write(0, index, true);
  mmio_region_write32(i2c->base_addr, I2C_INTR_STATE_REG_OFFSET,
                      intr_state_reg);

  return kDifOk;
}

OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_force(const dif_i2c_t *i2c, dif_i2c_irq_t irq) {
  if (i2c == NULL) {
    return kDifBadArg;
  }

  bitfield_bit32_index_t index;
  if (!i2c_get_irq_bit_index(irq, &index)) {
    return kDifBadArg;
  }

  uint32_t intr_test_reg = bitfield_bit32_write(0, index, true);
  mmio_region_write32(i2c->base_addr, I2C_INTR_TEST_REG_OFFSET, intr_test_reg);

  return kDifOk;
}

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) {
  if (i2c == NULL || state == NULL) {
    return kDifBadArg;
  }

  bitfield_bit32_index_t index;
  if (!i2c_get_irq_bit_index(irq, &index)) {
    return kDifBadArg;
  }

  uint32_t intr_enable_reg =
      mmio_region_read32(i2c->base_addr, I2C_INTR_ENABLE_REG_OFFSET);

  bool is_enabled = bitfield_bit32_read(intr_enable_reg, index);
  *state = is_enabled ? kDifToggleEnabled : kDifToggleDisabled;

  return kDifOk;
}

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) {
  if (i2c == NULL) {
    return kDifBadArg;
  }

  bitfield_bit32_index_t index;
  if (!i2c_get_irq_bit_index(irq, &index)) {
    return kDifBadArg;
  }

  uint32_t intr_enable_reg =
      mmio_region_read32(i2c->base_addr, I2C_INTR_ENABLE_REG_OFFSET);

  bool enable_bit = (state == kDifToggleEnabled) ? true : false;
  intr_enable_reg = bitfield_bit32_write(intr_enable_reg, index, enable_bit);
  mmio_region_write32(i2c->base_addr, I2C_INTR_ENABLE_REG_OFFSET,
                      intr_enable_reg);

  return kDifOk;
}

OT_WARN_UNUSED_RESULT
dif_result_t dif_i2c_irq_disable_all(const dif_i2c_t *i2c,
                                     dif_i2c_irq_enable_snapshot_t *snapshot) {
  if (i2c == NULL) {
    return kDifBadArg;
  }

  // Pass the current interrupt state to the caller, if requested.
  if (snapshot != NULL) {
    *snapshot = mmio_region_read32(i2c->base_addr, I2C_INTR_ENABLE_REG_OFFSET);
  }

  // Disable all interrupts.
  mmio_region_write32(i2c->base_addr, I2C_INTR_ENABLE_REG_OFFSET, 0u);

  return kDifOk;
}

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) {
  if (i2c == NULL || snapshot == NULL) {
    return kDifBadArg;
  }

  mmio_region_write32(i2c->base_addr, I2C_INTR_ENABLE_REG_OFFSET, *snapshot);

  return kDifOk;
}