6f66f414a0
Doing PCI config operations via MMIO window by default is a requirement, if supported by the platform. This means chipset or CPU code must enable MMCONF operations early in bootblock already, or before platform-specific romstage entry. Platforms are allowed to have NO_MMCONF_SUPPORT only in the case it is actually not implemented in the silicon. Change-Id: Id4d9029dec2fe195f09373320de800fcdf88c15d Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/17693 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2004 Linux Networx
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* (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
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* Copyright (C) 2009 coresystems GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <console/console.h>
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#include <device/pci.h>
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#include <device/pci_ids.h>
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#include <device/pci_ops.h>
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const struct pci_bus_operations *pci_bus_default_ops(device_t dev)
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{
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if (IS_ENABLED(CONFIG_NO_MMCONF_SUPPORT))
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return &pci_cf8_conf1;
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return &pci_ops_mmconf;
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}
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static const struct pci_bus_operations *pci_bus_ops(struct bus *bus, struct device *dev)
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{
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const struct pci_bus_operations *bops;
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bops = NULL;
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if (bus && bus->dev && bus->dev->ops && bus->dev->ops->ops_pci_bus) {
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bops = bus->dev->ops->ops_pci_bus(dev);
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}
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if (!bops)
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bops = pci_bus_default_ops(dev);
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return bops;
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}
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/*
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* The only consumer of the return value of get_pbus() is pci_bus_ops().
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* pci_bus_ops() can handle being passed NULL and auto-picks working ops.
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*/
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static struct bus *get_pbus(struct device *dev)
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{
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struct bus *pbus = NULL;
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if (!dev)
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die("get_pbus: dev is NULL!\n");
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else
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pbus = dev->bus;
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while (pbus && pbus->dev && !pci_bus_ops(pbus, dev)) {
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if (pbus == pbus->dev->bus) {
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printk(BIOS_ALERT, "%s in endless loop looking for a "
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"parent bus with pci_bus_ops for %s, breaking "
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"out.\n", __func__, dev_path(dev));
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break;
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}
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pbus = pbus->dev->bus;
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}
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if (!pbus || !pbus->dev || !pbus->dev->ops
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|| !pbus->dev->ops->ops_pci_bus) {
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/* This can happen before the device tree is fully set up. */
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// printk(BIOS_EMERG, "%s: Cannot find PCI bus operations.\n",
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// dev_path(dev));
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pbus = NULL;
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}
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return pbus;
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}
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u8 pci_read_config8(struct device *dev, unsigned int where)
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{
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struct bus *pbus = get_pbus(dev);
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return pci_bus_ops(pbus, dev)->read8(pbus, dev->bus->secondary,
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dev->path.pci.devfn, where);
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}
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u16 pci_read_config16(struct device *dev, unsigned int where)
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{
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struct bus *pbus = get_pbus(dev);
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return pci_bus_ops(pbus, dev)->read16(pbus, dev->bus->secondary,
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dev->path.pci.devfn, where);
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}
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u32 pci_read_config32(struct device *dev, unsigned int where)
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{
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struct bus *pbus = get_pbus(dev);
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return pci_bus_ops(pbus, dev)->read32(pbus, dev->bus->secondary,
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dev->path.pci.devfn, where);
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}
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void pci_write_config8(struct device *dev, unsigned int where, u8 val)
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{
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struct bus *pbus = get_pbus(dev);
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pci_bus_ops(pbus, dev)->write8(pbus, dev->bus->secondary,
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dev->path.pci.devfn, where, val);
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}
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void pci_write_config16(struct device *dev, unsigned int where, u16 val)
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{
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struct bus *pbus = get_pbus(dev);
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pci_bus_ops(pbus, dev)->write16(pbus, dev->bus->secondary,
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dev->path.pci.devfn, where, val);
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}
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void pci_write_config32(struct device *dev, unsigned int where, u32 val)
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{
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struct bus *pbus = get_pbus(dev);
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pci_bus_ops(pbus, dev)->write32(pbus, dev->bus->secondary,
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dev->path.pci.devfn, where, val);
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}
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