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 <linux/libfdt.h> 11 #include <pci.h> 12 #include <dm/lists.h> 13 14 struct sandbox_pci_priv { 15 int dev_count; 16 }; 17 18 int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn, 19 struct udevice **emulp) 20 { 21 struct udevice *dev; 22 int ret; 23 24 ret = pci_bus_find_devfn(bus, find_devfn, &dev); 25 if (ret) { 26 debug("%s: Could not find emulator for dev %x\n", __func__, 27 find_devfn); 28 return ret; 29 } 30 31 ret = device_find_first_child(dev, emulp); 32 if (ret) 33 return ret; 34 35 return *emulp ? 0 : -ENODEV; 36 } 37 38 static int sandbox_pci_emul_post_probe(struct udevice *dev) 39 { 40 struct sandbox_pci_priv *priv = dev->uclass->priv; 41 42 priv->dev_count++; 43 sandbox_set_enable_pci_map(true); 44 45 return 0; 46 } 47 48 static int sandbox_pci_emul_pre_remove(struct udevice *dev) 49 { 50 struct sandbox_pci_priv *priv = dev->uclass->priv; 51 52 priv->dev_count--; 53 sandbox_set_enable_pci_map(priv->dev_count > 0); 54 55 return 0; 56 } 57 58 UCLASS_DRIVER(pci_emul) = { 59 .id = UCLASS_PCI_EMUL, 60 .name = "pci_emul", 61 .post_probe = sandbox_pci_emul_post_probe, 62 .pre_remove = sandbox_pci_emul_pre_remove, 63 .priv_auto_alloc_size = sizeof(struct sandbox_pci_priv), 64 }; 65