124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
|
|
* Shared support code for AMD K8 northbridges and derivates.
|
|
* Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2.
|
|
*/
|
|
#include <linux/gfp.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/spinlock.h>
|
|
#include <asm/k8.h>
|
|
|
|
int num_k8_northbridges;
|
|
EXPORT_SYMBOL(num_k8_northbridges);
|
|
|
|
static u32 *flush_words;
|
|
|
|
struct pci_device_id k8_nb_ids[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1103) },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1203) },
|
|
{}
|
|
};
|
|
EXPORT_SYMBOL(k8_nb_ids);
|
|
|
|
struct pci_dev **k8_northbridges;
|
|
EXPORT_SYMBOL(k8_northbridges);
|
|
|
|
static struct pci_dev *next_k8_northbridge(struct pci_dev *dev)
|
|
{
|
|
do {
|
|
dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
|
|
if (!dev)
|
|
break;
|
|
} while (!pci_match_id(&k8_nb_ids[0], dev));
|
|
return dev;
|
|
}
|
|
|
|
int cache_k8_northbridges(void)
|
|
{
|
|
int i;
|
|
struct pci_dev *dev;
|
|
|
|
if (num_k8_northbridges)
|
|
return 0;
|
|
|
|
dev = NULL;
|
|
while ((dev = next_k8_northbridge(dev)) != NULL)
|
|
num_k8_northbridges++;
|
|
|
|
k8_northbridges = kmalloc((num_k8_northbridges + 1) * sizeof(void *),
|
|
GFP_KERNEL);
|
|
if (!k8_northbridges)
|
|
return -ENOMEM;
|
|
|
|
if (!num_k8_northbridges) {
|
|
k8_northbridges[0] = NULL;
|
|
return 0;
|
|
}
|
|
|
|
flush_words = kmalloc(num_k8_northbridges * sizeof(u32), GFP_KERNEL);
|
|
if (!flush_words) {
|
|
kfree(k8_northbridges);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev = NULL;
|
|
i = 0;
|
|
while ((dev = next_k8_northbridge(dev)) != NULL) {
|
|
k8_northbridges[i] = dev;
|
|
pci_read_config_dword(dev, 0x9c, &flush_words[i++]);
|
|
}
|
|
k8_northbridges[i] = NULL;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cache_k8_northbridges);
|
|
|
|
/* Ignores subdevice/subvendor but as far as I can figure out
|
|
they're useless anyways */
|
|
int __init early_is_k8_nb(u32 device)
|
|
{
|
|
struct pci_device_id *id;
|
|
u32 vendor = device & 0xffff;
|
|
device >>= 16;
|
|
for (id = k8_nb_ids; id->vendor; id++)
|
|
if (vendor == id->vendor && device == id->device)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
void k8_flush_garts(void)
|
|
{
|
|
int flushed, i;
|
|
unsigned long flags;
|
|
static DEFINE_SPINLOCK(gart_lock);
|
|
|
|
/* Avoid races between AGP and IOMMU. In theory it's not needed
|
|
but I'm not sure if the hardware won't lose flush requests
|
|
when another is pending. This whole thing is so expensive anyways
|
|
that it doesn't matter to serialize more. -AK */
|
|
spin_lock_irqsave(&gart_lock, flags);
|
|
flushed = 0;
|
|
for (i = 0; i < num_k8_northbridges; i++) {
|
|
pci_write_config_dword(k8_northbridges[i], 0x9c,
|
|
flush_words[i]|1);
|
|
flushed++;
|
|
}
|
|
for (i = 0; i < num_k8_northbridges; i++) {
|
|
u32 w;
|
|
/* Make sure the hardware actually executed the flush*/
|
|
for (;;) {
|
|
pci_read_config_dword(k8_northbridges[i],
|
|
0x9c, &w);
|
|
if (!(w & 1))
|
|
break;
|
|
cpu_relax();
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&gart_lock, flags);
|
|
if (!flushed)
|
|
printk("nothing to flush?\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(k8_flush_garts);
|
|
|