src/pci.c

// PCI config space access functions.
//
// Copyright (C) 2008  Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2002  MandrakeSoft S.A.
//
// This file may be distributed under the terms of the GNU GPLv3 license.

#include "pci.h" // PCIDevice
#include "ioport.h" // outl

void pci_config_writel(PCIDevice d, u32 addr, u32 val)
{
    outl(0x80000000 | (d.bus << 16) | (d.devfn << 8) | (addr & 0xfc)
         , PORT_PCI_CMD);
    outl(val, PORT_PCI_DATA);
}

void pci_config_writew(PCIDevice d, u32 addr, u16 val)
{
    outl(0x80000000 | (d.bus << 16) | (d.devfn << 8) | (addr & 0xfc)
         , PORT_PCI_CMD);
    outw(val, PORT_PCI_DATA + (addr & 2));
}

void pci_config_writeb(PCIDevice d, u32 addr, u8 val)
{
    outl(0x80000000 | (d.bus << 16) | (d.devfn << 8) | (addr & 0xfc)
         , PORT_PCI_CMD);
    outb(val, PORT_PCI_DATA + (addr & 3));
}

u32 pci_config_readl(PCIDevice d, u32 addr)
{
    outl(0x80000000 | (d.bus << 16) | (d.devfn << 8) | (addr & 0xfc)
         , PORT_PCI_CMD);
    return inl(PORT_PCI_DATA);
}

u16 pci_config_readw(PCIDevice d, u32 addr)
{
    outl(0x80000000 | (d.bus << 16) | (d.devfn << 8) | (addr & 0xfc)
         , PORT_PCI_CMD);
    return inw(PORT_PCI_DATA + (addr & 2));
}

u8 pci_config_readb(PCIDevice d, u32 addr)
{
    outl(0x80000000 | (d.bus << 16) | (d.devfn << 8) | (addr & 0xfc)
         , PORT_PCI_CMD);
    return inb(PORT_PCI_DATA + (addr & 3));
}

int
pci_find_device(u16 vendid, u16 devid, int index, PCIDevice *dev)
{
    int devfn;
    u32 id = (devid << 16) | vendid;
    for (devfn=0; devfn<0x100; devfn++) {
        PCIDevice d = pci_bd(0, devfn);
        u32 v = pci_config_readl(d, 0x00);
        if (v != id)
            continue;
        if (index) {
            index--;
            continue;
        }
        // Found it.
        *dev = d;
        return 0;
    }
    return -1;
}

int
pci_find_class(u32 classid, int index, PCIDevice *dev)
{
    int devfn;
    u32 id = classid << 8;
    for (devfn=0; devfn<0x100; devfn++) {
        PCIDevice d = pci_bd(0, devfn);
        u32 v = pci_config_readl(d, 0x08);
        if (v != id)
            continue;
        if (index) {
            index--;
            continue;
        }
        // Found it.
        *dev = d;
        return 0;
    }
    return -1;
}