/* * This file is part of the coreboot project. * * Copyright (C) 2004 Linux Networx * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx) * Copyright (C) 2009 coresystems GmbH * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <console/console.h> #include <device/pci.h> #include <device/pci_ids.h> #include <device/pci_ops.h> static const struct pci_bus_operations *pci_bus_ops(struct bus *bus, struct device *dev) { const struct pci_bus_operations *bops; bops = NULL; if (bus && bus->dev && bus->dev->ops && bus->dev->ops->ops_pci_bus) { bops = bus->dev->ops->ops_pci_bus(dev); } if (!bops) bops = pci_bus_default_ops(dev); return bops; } /* * The only consumer of the return value of get_pbus() is pci_bus_ops(). * pci_bus_ops() can handle being passed NULL and auto-picks working ops. */ static struct bus *get_pbus(struct device *dev) { struct bus *pbus = NULL; if (!dev) die("get_pbus: dev is NULL!\n"); else pbus = dev->bus; while (pbus && pbus->dev && !pci_bus_ops(pbus, dev)) { if (pbus == pbus->dev->bus) { printk(BIOS_ALERT, "%s in endless loop looking for a " "parent bus with pci_bus_ops for %s, breaking " "out.\n", __func__, dev_path(dev)); break; } pbus = pbus->dev->bus; } if (!pbus || !pbus->dev || !pbus->dev->ops || !pbus->dev->ops->ops_pci_bus) { /* This can happen before the device tree is fully set up. */ // printk(BIOS_EMERG, "%s: Cannot find PCI bus operations.\n", // dev_path(dev)); pbus = NULL; } return pbus; } u8 pci_read_config8(struct device *dev, unsigned int where) { struct bus *pbus = get_pbus(dev); return pci_bus_ops(pbus, dev)->read8(pbus, dev->bus->secondary, dev->path.pci.devfn, where); } u16 pci_read_config16(struct device *dev, unsigned int where) { struct bus *pbus = get_pbus(dev); return pci_bus_ops(pbus, dev)->read16(pbus, dev->bus->secondary, dev->path.pci.devfn, where); } u32 pci_read_config32(struct device *dev, unsigned int where) { struct bus *pbus = get_pbus(dev); return pci_bus_ops(pbus, dev)->read32(pbus, dev->bus->secondary, dev->path.pci.devfn, where); } void pci_write_config8(struct device *dev, unsigned int where, u8 val) { struct bus *pbus = get_pbus(dev); pci_bus_ops(pbus, dev)->write8(pbus, dev->bus->secondary, dev->path.pci.devfn, where, val); } void pci_write_config16(struct device *dev, unsigned int where, u16 val) { struct bus *pbus = get_pbus(dev); pci_bus_ops(pbus, dev)->write16(pbus, dev->bus->secondary, dev->path.pci.devfn, where, val); } void pci_write_config32(struct device *dev, unsigned int where, u32 val) { struct bus *pbus = get_pbus(dev); pci_bus_ops(pbus, dev)->write32(pbus, dev->bus->secondary, dev->path.pci.devfn, where, val); }