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#include <console/console.h>
#include <arch/io.h>
#include <arch/pciconf.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
/*
* Before we decide to use direct hardware access mechanisms, we try to do some
* trivial checks to ensure it at least _seems_ to be working -- we just test
* whether bus 00 contains a host bridge (this is similar to checking
* techniques used in XFree86, but ours should be more reliable since we
* attempt to make use of direct access hints provided by the PCI BIOS).
*
* This should be close to trivial, but it isn't, because there are buggy
* chipsets (yes, you guessed it, by Intel and Compaq) that have no class ID.
*/
static int pci_sanity_check(const struct pci_ops *o)
{
uint16_t class, vendor;
uint8_t bus;
int devfn;
#define PCI_CLASS_BRIDGE_HOST 0x0600
#define PCI_CLASS_DISPLAY_VGA 0x0300
#define PCI_VENDOR_ID_COMPAQ 0x0e11
#define PCI_VENDOR_ID_INTEL 0x8086
#define PCI_VENDOR_ID_MOTOROLA 0x1057
for (bus = 0, devfn = 0; devfn < 0x100; devfn++) {
class = o->read16(bus, devfn, PCI_CLASS_DEVICE);
vendor = o->read16(bus, devfn, PCI_VENDOR_ID);
if (((class == PCI_CLASS_BRIDGE_HOST) || (class == PCI_CLASS_DISPLAY_VGA)) ||
((vendor == PCI_VENDOR_ID_INTEL) || (vendor == PCI_VENDOR_ID_COMPAQ) ||
(vendor == PCI_VENDOR_ID_MOTOROLA))) {
return 1;
}
}
printk_err("PCI: Sanity check failed\n");
return 0;
}
static void pci_check_direct(void)
{
unsigned int tmp;
/*
* Check if configuration type 1 works.
*/
{
outb(0x01, 0xCFB);
tmp = inl(0xCF8);
outl(0x80000000, 0xCF8);
if (inl(0xCF8) == 0x80000000) {
pci_set_method_conf1();
if (pci_sanity_check(conf)) {
outl(tmp, 0xCF8);
printk_debug("PCI: Using configuration type 1\n");
return;
}
}
outl(tmp, 0xCF8);
}
/*
* Check if configuration type 2 works.
*/
{
outb(0x00, 0xCFB);
outb(0x00, 0xCF8);
outb(0x00, 0xCFA);
if (inb(0xCF8) == 0x00 && inb(0xCFA) == 0x00) {
pci_set_method_conf2();
if (pci_sanity_check(conf)) {
printk_debug("PCI: Using configuration type 2\n");
}
}
}
printk_debug("pci_check_direct failed\n");
conf = 0;
return;
}
/** Set the method to be used for PCI, type I or type II
*/
void pci_set_method(void)
{
printk_info("Finding PCI configuration type.\n");
pci_check_direct();
post_code(0x5f);
}
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