LXR uboot/drivers/pci/pci-emul-uclass.c

   1/*
   2 * Copyright (c) 2014 Google, Inc
   3 * Written by Simon Glass <sjg@chromium.org>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <dm.h>
  10#include <fdtdec.h>
  11#include <libfdt.h>
  12#include <pci.h>
  13#include <dm/lists.h>
  14
  15DECLARE_GLOBAL_DATA_PTR;
  16
  17struct sandbox_pci_priv {
  18        int dev_count;
  19};
  20
  21int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
  22                         struct udevice **emulp)
  23{
  24        struct udevice *dev;
  25        int ret;
  26
  27        ret = pci_bus_find_devfn(bus, find_devfn, &dev);
  28        if (ret) {
  29                debug("%s: Could not find emulator for dev %x\n", __func__,
  30                      find_devfn);
  31                return ret;
  32        }
  33
  34        ret = device_find_first_child(dev, emulp);
  35        if (ret)
  36                return ret;
  37
  38        return *emulp ? 0 : -ENODEV;
  39}
  40
  41static int sandbox_pci_emul_post_probe(struct udevice *dev)
  42{
  43        struct sandbox_pci_priv *priv = dev->uclass->priv;
  44
  45        priv->dev_count++;
  46        sandbox_set_enable_pci_map(true);
  47
  48        return 0;
  49}
  50
  51static int sandbox_pci_emul_pre_remove(struct udevice *dev)
  52{
  53        struct sandbox_pci_priv *priv = dev->uclass->priv;
  54
  55        priv->dev_count--;
  56        sandbox_set_enable_pci_map(priv->dev_count > 0);
  57
  58        return 0;
  59}
  60
  61UCLASS_DRIVER(pci_emul) = {
  62        .id             = UCLASS_PCI_EMUL,
  63        .name           = "pci_emul",
  64        .post_probe     = sandbox_pci_emul_post_probe,
  65        .pre_remove     = sandbox_pci_emul_pre_remove,
  66        .priv_auto_alloc_size   = sizeof(struct sandbox_pci_priv),
  67};
  68