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 <dm.h>
   8 #include <fdtdec.h>
   9 #include <log.h>
  10 #include <linux/libfdt.h>
  11 #include <pci.h>
  12 #include <dm/lists.h>
  13
  14 struct sandbox_pci_emul_priv {
  15         int dev_count;
  16 };
  17
  18 int sandbox_pci_get_emul(const struct udevice *bus, pci_dev_t find_devfn,
  19                          struct udevice **containerp, struct udevice **emulp)
  20 {
  21         struct pci_emul_uc_priv *upriv;
  22         struct udevice *dev;
  23         int ret;
  24
  25         *containerp = NULL;
  26         ret = pci_bus_find_devfn(bus, PCI_MASK_BUS(find_devfn), &dev);
  27         if (ret) {
  28                 debug("%s: Could not find emulator for dev %x\n", __func__,
  29                       find_devfn);
  30                 return ret;
  31         }
  32         *containerp = dev;
  33
  34         ret = uclass_get_device_by_phandle(UCLASS_PCI_EMUL, dev, "sandbox,emul",
  35                                            emulp);
  36         if (!ret) {
  37                 upriv = dev_get_uclass_priv(*emulp);
  38
  39                 upriv->client = dev;
  40         } else if (device_get_uclass_id(dev) != UCLASS_PCI_GENERIC) {
  41                 /*
  42                  * See commit 4345998ae9df,
  43                  * "pci: sandbox: Support dynamically binding device driver"
  44                  */
  45                 *emulp = dev;
  46         }
  47
  48         return 0;
  49 }
  50
  51 int sandbox_pci_get_client(struct udevice *emul, struct udevice **devp)
  52 {
  53         struct pci_emul_uc_priv *upriv = dev_get_uclass_priv(emul);
  54
  55         if (!upriv->client)
  56                 return -ENOENT;
  57         *devp = upriv->client;
  58
  59         return 0;
  60 }
  61
  62 uint sandbox_pci_read_bar(u32 barval, int type, uint size)
  63 {
  64         u32 result;
  65
  66         result = barval;
  67         if (result == 0xffffffff) {
  68                 if (type == PCI_BASE_ADDRESS_SPACE_IO) {
  69                         result = (~(size - 1) &
  70                                 PCI_BASE_ADDRESS_IO_MASK) |
  71                                 PCI_BASE_ADDRESS_SPACE_IO;
  72                 } else {
  73                         result = (~(size - 1) &
  74                                 PCI_BASE_ADDRESS_MEM_MASK) |
  75                                 PCI_BASE_ADDRESS_MEM_TYPE_32;
  76                 }
  77         }
  78
  79         return result;
  80 }
  81
  82 static int sandbox_pci_emul_post_probe(struct udevice *dev)
  83 {
  84         struct sandbox_pci_emul_priv *priv = uclass_get_priv(dev->uclass);
  85
  86         priv->dev_count++;
  87         sandbox_set_enable_pci_map(true);
  88
  89         return 0;
  90 }
  91
  92 static int sandbox_pci_emul_pre_remove(struct udevice *dev)
  93 {
  94         struct sandbox_pci_emul_priv *priv = uclass_get_priv(dev->uclass);
  95
  96         priv->dev_count--;
  97         sandbox_set_enable_pci_map(priv->dev_count > 0);
  98
  99         return 0;
 100 }
 101
 102 UCLASS_DRIVER(pci_emul) = {
 103         .id             = UCLASS_PCI_EMUL,
 104         .name           = "pci_emul",
 105         .post_probe     = sandbox_pci_emul_post_probe,
 106         .pre_remove     = sandbox_pci_emul_pre_remove,
 107         .priv_auto      = sizeof(struct sandbox_pci_emul_priv),
 108         .per_device_auto        = sizeof(struct pci_emul_uc_priv),
 109 };
 110
 111 /*
 112  * This uclass is a child of the pci bus. Its plat is not defined here so
 113  * is defined by its parent, UCLASS_PCI, which uses struct pci_child_plat.
 114  * See per_child_plat_auto      in UCLASS_DRIVER(pci).
 115  */
 116 UCLASS_DRIVER(pci_emul_parent) = {
 117         .id             = UCLASS_PCI_EMUL_PARENT,
 118         .name           = "pci_emul_parent",
 119         .post_bind      = dm_scan_fdt_dev,
 120 };
 121
 122 static const struct udevice_id pci_emul_parent_ids[] = {
 123         { .compatible = "sandbox,pci-emul-parent" },
 124         { }
 125 };
 126
 127 U_BOOT_DRIVER(pci_emul_parent_drv) = {
 128         .name           = "pci_emul_parent_drv",
 129         .id             = UCLASS_PCI_EMUL_PARENT,
 130         .of_match       = pci_emul_parent_ids,
 131 };