From 36d0d3b4b4974f4183609ac8b4d77a1f46acba55 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 5 Mar 2015 12:25:28 -0700 Subject: dm: sandbox: pci: Add a PCI emulation uclass Since sandbox does not have real devices (unless it borrows those from the host) it must use emulations. Provide a uclass which permits PCI operations to be passed through to an emulation device. Signed-off-by: Simon Glass --- drivers/pci/pci-emul-uclass.c | 67 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 drivers/pci/pci-emul-uclass.c (limited to 'drivers/pci/pci-emul-uclass.c') diff --git a/drivers/pci/pci-emul-uclass.c b/drivers/pci/pci-emul-uclass.c new file mode 100644 index 0000000..0f8e3c9 --- /dev/null +++ b/drivers/pci/pci-emul-uclass.c @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2014 Google, Inc + * Written by Simon Glass + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include +#include +#include + +DECLARE_GLOBAL_DATA_PTR; + +struct sandbox_pci_priv { + int dev_count; +}; + +int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn, + struct udevice **emulp) +{ + struct udevice *dev; + int ret; + + ret = pci_bus_find_devfn(bus, find_devfn, &dev); + if (ret) { + debug("%s: Could not find emulator for dev %x\n", __func__, + find_devfn); + return ret; + } + + ret = device_find_first_child(dev, emulp); + if (ret) + return ret; + + return *emulp ? 0 : -ENODEV; +} + +static int sandbox_pci_emul_post_probe(struct udevice *dev) +{ + struct sandbox_pci_priv *priv = dev->uclass->priv; + + priv->dev_count++; + sandbox_set_enable_pci_map(true); + + return 0; +} + +static int sandbox_pci_emul_pre_remove(struct udevice *dev) +{ + struct sandbox_pci_priv *priv = dev->uclass->priv; + + priv->dev_count--; + sandbox_set_enable_pci_map(priv->dev_count > 0); + + return 0; +} + +UCLASS_DRIVER(pci_emul) = { + .id = UCLASS_PCI_EMUL, + .name = "pci_emul", + .post_probe = sandbox_pci_emul_post_probe, + .pre_remove = sandbox_pci_emul_pre_remove, + .priv_auto_alloc_size = sizeof(struct sandbox_pci_priv), +}; -- cgit v1.1