/****************************************************************************
 * drivers/devicetree/fdt_virtio_mmio.c
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you 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.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <debug.h>
#include <errno.h>

#include <nuttx/fdt.h>
#include <nuttx/virtio/virtio-mmio.h>

#include <libfdt.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: fdt_virtio_mmio_devices_register
 *
 * Description:
 *   This function is used to register the virtio mmio devices from the
 *   device tree
 *
 * Input Parameters:
 *   fdt      - Device tree handle
 *   irqbase  - Interrupt base number
 *
 * Returned Value:
 *   Return 0 if success, nageative if failed
 *
 ****************************************************************************/

int fdt_virtio_mmio_devices_register(FAR const void *fdt, int irqbase)
{
  uintptr_t addr;
  int offset = -1;
  int irqnum;
  int ret;

  for (; ; )
    {
      offset = fdt_node_offset_by_compatible(fdt, offset, "virtio,mmio");
      if (offset == -FDT_ERR_NOTFOUND)
        {
          break;
        }

      addr = fdt_get_reg_base(fdt, offset, 0);
      irqnum = fdt_get_irq(fdt, offset, 1, irqbase);
      if (addr <= 0 || irqnum < 0)
        {
          return -EINVAL;
        }

      ret = virtio_register_mmio_device((FAR void *)addr, irqnum);
      if (ret < 0 && ret != -ENODEV)
        {
          return ret;
        }
    }

  return OK;
}