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