lib/pci.c

/*
 * Copyright (C) 2013, Red Hat Inc, Michael S. Tsirkin <mst@redhat.com>
 *
 * This work is licensed under the terms of the GNU LGPL, version 2.
 */
#include <linux/pci_regs.h>
#include "pci.h"
#include "asm/pci.h"

/* Scan bus look for a specific device. Only bus 0 scanned for now. */
pcidevaddr_t pci_find_dev(uint16_t vendor_id, uint16_t device_id)
{
    unsigned dev;
    for (dev = 0; dev < 256; ++dev) {
    uint32_t id = pci_config_read(dev, 0);
    if ((id & 0xFFFF) == vendor_id && (id >> 16) == device_id) {
        return dev;
    }
    }
    return PCIDEVADDR_INVALID;
}

unsigned long pci_bar_addr(pcidevaddr_t dev, int bar_num)
{
    uint32_t bar = pci_config_read(dev, PCI_BASE_ADDRESS_0 + bar_num * 4);
    if (bar & PCI_BASE_ADDRESS_SPACE_IO) {
        return bar & PCI_BASE_ADDRESS_IO_MASK;
    } else {
        return bar & PCI_BASE_ADDRESS_MEM_MASK;
    }
}

bool pci_bar_is_memory(pcidevaddr_t dev, int bar_num)
{
    uint32_t bar = pci_config_read(dev, PCI_BASE_ADDRESS_0 + bar_num * 4);
    return !(bar & PCI_BASE_ADDRESS_SPACE_IO);
}

bool pci_bar_is_valid(pcidevaddr_t dev, int bar_num)
{
    uint32_t bar = pci_config_read(dev, PCI_BASE_ADDRESS_0 + bar_num * 4);
    return bar;
}