drivers/pci/pci_sandbox.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2014 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <fdtdec.h>
  10 #include <inttypes.h>
  11 #include <pci.h>
  12
  13 static int sandbox_pci_write_config(struct udevice *bus, pci_dev_t devfn,
  14                                     uint offset, ulong value,
  15                                     enum pci_size_t size)
  16 {
  17         struct dm_pci_emul_ops *ops;
  18         struct udevice *emul;
  19         int ret;
  20
  21         ret = sandbox_pci_get_emul(bus, devfn, &emul);
  22         if (ret)
  23                 return ret == -ENODEV ? 0 : ret;
  24         ops = pci_get_emul_ops(emul);
  25         if (!ops || !ops->write_config)
  26                 return -ENOSYS;
  27
  28         return ops->write_config(emul, offset, value, size);
  29 }
  30
  31 static int sandbox_pci_read_config(struct udevice *bus, pci_dev_t devfn,
  32                                    uint offset, ulong *valuep,
  33                                    enum pci_size_t size)
  34 {
  35         struct dm_pci_emul_ops *ops;
  36         struct udevice *emul;
  37         int ret;
  38
  39         /* Prepare the default response */
  40         *valuep = pci_get_ff(size);
  41         ret = sandbox_pci_get_emul(bus, devfn, &emul);
  42         if (ret)
  43                 return ret == -ENODEV ? 0 : ret;
  44         ops = pci_get_emul_ops(emul);
  45         if (!ops || !ops->read_config)
  46                 return -ENOSYS;
  47
  48         return ops->read_config(emul, offset, valuep, size);
  49 }
  50
  51 static const struct dm_pci_ops sandbox_pci_ops = {
  52         .read_config = sandbox_pci_read_config,
  53         .write_config = sandbox_pci_write_config,
  54 };
  55
  56 static const struct udevice_id sandbox_pci_ids[] = {
  57         { .compatible = "sandbox,pci" },
  58         { }
  59 };
  60
  61 U_BOOT_DRIVER(pci_sandbox) = {
  62         .name   = "pci_sandbox",
  63         .id     = UCLASS_PCI,
  64         .of_match = sandbox_pci_ids,
  65         .ops    = &sandbox_pci_ops,
  66
  67         /* Attach an emulator if we can */
  68         .child_post_bind = dm_scan_fdt_dev,
  69         .per_child_platdata_auto_alloc_size =
  70                         sizeof(struct pci_child_platdata),
  71 };