81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
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* This file is part of the coreboot project.
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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 <arch/io.h>
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#include <device/pci.h>
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#include <device/pci_ops.h>
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#if !defined(CONFIG_MMCONF_BASE_ADDRESS) || !CONFIG_MMCONF_BASE_ADDRESS
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#error "CONFIG_MMCONF_BASE_ADDRESS needs to be non-zero!"
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#endif
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/*
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* Functions for accessing PCI configuration space with mmconf accesses
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*/
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#define PCI_MMIO_ADDR(SEGBUS, DEVFN, WHERE, MASK) \
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((void *)(((uintptr_t)CONFIG_MMCONF_BASE_ADDRESS |\
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(((SEGBUS) & 0xFFF) << 20) |\
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(((DEVFN) & 0xFF) << 12) |\
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((WHERE) & 0xFFF)) & ~MASK))
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static uint8_t pci_mmconf_read_config8(struct bus *pbus, int bus, int devfn,
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int where)
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{
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return read8(PCI_MMIO_ADDR(bus, devfn, where, 0));
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}
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static uint16_t pci_mmconf_read_config16(struct bus *pbus, int bus, int devfn,
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int where)
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{
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return read16(PCI_MMIO_ADDR(bus, devfn, where, 1));
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}
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static uint32_t pci_mmconf_read_config32(struct bus *pbus, int bus, int devfn,
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int where)
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{
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return read32(PCI_MMIO_ADDR(bus, devfn, where, 3));
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}
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static void pci_mmconf_write_config8(struct bus *pbus, int bus, int devfn,
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int where, uint8_t value)
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{
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write8(PCI_MMIO_ADDR(bus, devfn, where, 0), value);
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}
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static void pci_mmconf_write_config16(struct bus *pbus, int bus, int devfn,
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int where, uint16_t value)
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{
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write16(PCI_MMIO_ADDR(bus, devfn, where, 1), value);
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}
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static void pci_mmconf_write_config32(struct bus *pbus, int bus, int devfn,
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int where, uint32_t value)
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{
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write32(PCI_MMIO_ADDR(bus, devfn, where, 3), value);
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}
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static const struct pci_bus_operations pci_ops_mmconf = {
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.read8 = pci_mmconf_read_config8,
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.read16 = pci_mmconf_read_config16,
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.read32 = pci_mmconf_read_config32,
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.write8 = pci_mmconf_write_config8,
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.write16 = pci_mmconf_write_config16,
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.write32 = pci_mmconf_write_config32,
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};
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const struct pci_bus_operations *pci_bus_default_ops(struct device *dev)
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{
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return &pci_ops_mmconf;
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}
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