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

<%doc>
    This file is the "auto-generated DIF library implementation template", which
    provides implementations of some mandatory DIFs that are similar across all
    IPs. When rendered, this template implements the DIFs defined in the
    auto-generated DIF header file (see util/make_new_dif/dif_autogen.inc.tpl).

    Note, this template requires the following Python objects to be passed:

    1. ip: See util/make_new_dif.py for the definition of the `ip` obj.
    2. list[irq]: See util/make_new_dif.py for the definition of the `irq` obj.
</%doc>

<%def name="mmio_region_read32(intr_reg_upper)">mmio_region_read32(
  ${ip.name_snake}->base_addr, 
  ${ip.name_upper}_INTR_${intr_reg_upper}_REG_OFFSET);
</%def>

<%def name="mmio_region_write32(intr_reg_upper, value)">mmio_region_write32(
  ${ip.name_snake}->base_addr, 
  ${ip.name_upper}_INTR_${intr_reg_upper}_REG_OFFSET,
  ${value});
</%def>

// This file is auto-generated.

#include "sw/device/lib/dif/dif_${ip.name_snake}.h"

#include "${ip.name_snake}_regs.h"  // Generated.

% if len(irqs) > 0:

  /**
   * Get the corresponding interrupt register bit offset. INTR_STATE,
   * INTR_ENABLE and INTR_TEST registers have the same bit offsets, so this
   * routine can be reused.
   */
  static bool ${ip.name_snake}_get_irq_bit_index(
    dif_${ip.name_snake}_irq_t irq,
    bitfield_bit32_index_t *index_out) {

    switch (irq) {
  % for irq in irqs:
    ## This handles the GPIO IP case where there is a multi-bit interrupt.
    % if irq.width > 1:
      % for irq_idx in range(irq.width):
        case kDif${ip.name_camel}Irq${irq.name_camel}${irq_idx}:
          *index_out = ${irq_idx};
          break;
      % endfor
    ## This handles all other IPs.
    % else:
      case kDif${ip.name_camel}Irq${irq.name_camel}:
        *index_out = ${ip.name_upper}_INTR_STATE_${irq.name_upper}_BIT;
        break;
    % endif
  % endfor
      default:
        return false;
    }

    return true;
  }

  OT_WARN_UNUSED_RESULT
  dif_result_t dif_${ip.name_snake}_irq_get_state(
    const dif_${ip.name_snake}_t *${ip.name_snake},
    dif_${ip.name_snake}_irq_state_snapshot_t *snapshot) {

    if (${ip.name_snake} == NULL || snapshot == NULL) {
      return kDifBadArg;
    }

    *snapshot = ${mmio_region_read32("STATE")}

    return kDifOk;
  }

  OT_WARN_UNUSED_RESULT
  dif_result_t dif_${ip.name_snake}_irq_is_pending(
    const dif_${ip.name_snake}_t *${ip.name_snake},
    dif_${ip.name_snake}_irq_t irq,
    bool *is_pending) {

    if (${ip.name_snake} == NULL || is_pending == NULL) {
      return kDifBadArg;
    }

    bitfield_bit32_index_t index;
    if (!${ip.name_snake}_get_irq_bit_index(irq, &index)) {
      return kDifBadArg;
    }

    uint32_t intr_state_reg = ${mmio_region_read32("STATE")}
    *is_pending = bitfield_bit32_read(intr_state_reg, index);

    return kDifOk;
  }

  OT_WARN_UNUSED_RESULT
  dif_result_t dif_${ip.name_snake}_irq_acknowledge(
    const dif_${ip.name_snake}_t *${ip.name_snake},
    dif_${ip.name_snake}_irq_t irq) {

    if (${ip.name_snake} == NULL) {
      return kDifBadArg;
    }

    bitfield_bit32_index_t index;
    if (!${ip.name_snake}_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("STATE", "intr_state_reg")}

    return kDifOk;
  }

  OT_WARN_UNUSED_RESULT
  dif_result_t dif_${ip.name_snake}_irq_force(
    const dif_${ip.name_snake}_t *${ip.name_snake},
    dif_${ip.name_snake}_irq_t irq) {

    if (${ip.name_snake} == NULL) {
      return kDifBadArg;
    }

    bitfield_bit32_index_t index;
    if (!${ip.name_snake}_get_irq_bit_index(irq, &index)) {
      return kDifBadArg;
    }

    uint32_t intr_test_reg = bitfield_bit32_write(0, index, true);
    ${mmio_region_write32("TEST", "intr_test_reg")}

    return kDifOk;
  }

% if ip.name_snake != "aon_timer":
  OT_WARN_UNUSED_RESULT
  dif_result_t dif_${ip.name_snake}_irq_get_enabled(
    const dif_${ip.name_snake}_t *${ip.name_snake},
    dif_${ip.name_snake}_irq_t irq,
    dif_toggle_t *state) {
    
    if (${ip.name_snake} == NULL || state == NULL) {
      return kDifBadArg;
    }

    bitfield_bit32_index_t index;
    if (!${ip.name_snake}_get_irq_bit_index(irq, &index)) {
      return kDifBadArg;
    }

    uint32_t intr_enable_reg = ${mmio_region_read32("ENABLE")}
    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_${ip.name_snake}_irq_set_enabled(
    const dif_${ip.name_snake}_t *${ip.name_snake},
    dif_${ip.name_snake}_irq_t irq,
    dif_toggle_t state) {

    if (${ip.name_snake} == NULL) {
      return kDifBadArg;
    }

    bitfield_bit32_index_t index;
    if (!${ip.name_snake}_get_irq_bit_index(irq, &index)) {
      return kDifBadArg;
    }

    uint32_t intr_enable_reg = ${mmio_region_read32("ENABLE")}
    bool enable_bit = (state == kDifToggleEnabled) ? true : false;
    intr_enable_reg = bitfield_bit32_write(intr_enable_reg, index, enable_bit);
    ${mmio_region_write32("ENABLE", "intr_enable_reg")}

    return kDifOk;
  }

  OT_WARN_UNUSED_RESULT
  dif_result_t dif_${ip.name_snake}_irq_disable_all(
    const dif_${ip.name_snake}_t *${ip.name_snake},
    dif_${ip.name_snake}_irq_enable_snapshot_t *snapshot) {

    if (${ip.name_snake} == NULL) {
      return kDifBadArg;
    }

    // Pass the current interrupt state to the caller, if requested.
    if (snapshot != NULL) {
      *snapshot = ${mmio_region_read32("ENABLE")}
    }

    // Disable all interrupts.
    ${mmio_region_write32("ENABLE", "0u")}

    return kDifOk;
  }

  OT_WARN_UNUSED_RESULT
  dif_result_t dif_${ip.name_snake}_irq_restore_all(
    const dif_${ip.name_snake}_t *${ip.name_snake},
    const dif_${ip.name_snake}_irq_enable_snapshot_t *snapshot) {

    if (${ip.name_snake} == NULL || snapshot == NULL) {
      return kDifBadArg;
    }

    ${mmio_region_write32("ENABLE", "*snapshot")}

    return kDifOk;
  }
% endif

% endif