drivers/pci/pci-emul-uclass.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 <log.h>
  11 #include <linux/libfdt.h>
  12 #include <pci.h>
  13 #include <dm/lists.h>
  14
  15 struct sandbox_pci_emul_priv {
  16         int dev_count;
  17 };
  18
  19 int sandbox_pci_get_emul(const struct udevice *bus, pci_dev_t find_devfn,
  20                          struct udevice **containerp, struct udevice **emulp)
  21 {
  22         struct pci_emul_uc_priv *upriv;
  23         struct udevice *dev;
  24         int ret;
  25
  26         *containerp = NULL;
  27         ret = pci_bus_find_devfn(bus, PCI_MASK_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         *containerp = dev;
  34
  35         ret = uclass_get_device_by_phandle(UCLASS_PCI_EMUL, dev, "sandbox,emul",
  36                                            emulp);
  37         if (!ret) {
  38                 upriv = dev_get_uclass_priv(*emulp);
  39
  40                 upriv->client = dev;
  41         } else if (device_get_uclass_id(dev) != UCLASS_PCI_GENERIC) {
  42                 /*
  43                  * See commit 4345998ae9df,
  44                  * "pci: sandbox: Support dynamically binding device driver"
  45                  */
  46                 *emulp = dev;
  47         }
  48
  49         return 0;
  50 }
  51
  52 int sandbox_pci_get_client(struct udevice *emul, struct udevice **devp)
  53 {
  54         struct pci_emul_uc_priv *upriv = dev_get_uclass_priv(emul);
  55
  56         if (!upriv->client)
  57                 return -ENOENT;
  58         *devp = upriv->client;
  59
  60         return 0;
  61 }
  62
  63 uint sandbox_pci_read_bar(u32 barval, int type, uint size)
  64 {
  65         u32 result;
  66
  67         result = barval;
  68         if (result == 0xffffffff) {
  69                 if (type == PCI_BASE_ADDRESS_SPACE_IO) {
  70                         result = (~(size - 1) &
  71                                 PCI_BASE_ADDRESS_IO_MASK) |
  72                                 PCI_BASE_ADDRESS_SPACE_IO;
  73                 } else {
  74                         result = (~(size - 1) &
  75                                 PCI_BASE_ADDRESS_MEM_MASK) |
  76                                 PCI_BASE_ADDRESS_MEM_TYPE_32;
  77                 }
  78         }
  79
  80         return result;
  81 }
  82
  83 static int sandbox_pci_emul_post_probe(struct udevice *dev)
  84 {
  85         struct sandbox_pci_emul_priv *priv = dev->uclass->priv;
  86
  87         priv->dev_count++;
  88         sandbox_set_enable_pci_map(true);
  89
  90         return 0;
  91 }
  92
  93 static int sandbox_pci_emul_pre_remove(struct udevice *dev)
  94 {
  95         struct sandbox_pci_emul_priv *priv = dev->uclass->priv;
  96
  97         priv->dev_count--;
  98         sandbox_set_enable_pci_map(priv->dev_count > 0);
  99
 100         return 0;
 101 }
 102
 103 UCLASS_DRIVER(pci_emul) = {
 104         .id             = UCLASS_PCI_EMUL,
 105         .name           = "pci_emul",
 106         .post_probe     = sandbox_pci_emul_post_probe,
 107         .pre_remove     = sandbox_pci_emul_pre_remove,
 108         .priv_auto_alloc_size   = sizeof(struct sandbox_pci_emul_priv),
 109         .per_device_auto_alloc_size     = sizeof(struct pci_emul_uc_priv),
 110 };
 111
 112 /*
 113  * This uclass is a child of the pci bus. Its platdata is not defined here so
 114  * is defined by its parent, UCLASS_PCI, which uses struct pci_child_platdata.
 115  * See per_child_platdata_auto_alloc_size in UCLASS_DRIVER(pci).
 116  */
 117 UCLASS_DRIVER(pci_emul_parent) = {
 118         .id             = UCLASS_PCI_EMUL_PARENT,
 119         .name           = "pci_emul_parent",
 120         .post_bind      = dm_scan_fdt_dev,
 121 };
 122
 123 static const struct udevice_id pci_emul_parent_ids[] = {
 124         { .compatible = "sandbox,pci-emul-parent" },
 125         { }
 126 };
 127
 128 U_BOOT_DRIVER(pci_emul_parent_drv) = {
 129         .name           = "pci_emul_parent_drv",
 130         .id             = UCLASS_PCI_EMUL_PARENT,
 131         .of_match       = pci_emul_parent_ids,
 132 };