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
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 struct sandbox_pci_priv {
  18         int dev_count;
  19 };
  20
  21 int 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
  41 static 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
  51 static 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
  61 UCLASS_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 };