256 lines
6.2 KiB
C
256 lines
6.2 KiB
C
/*
|
|
* Shared support code for AMD K8 northbridges and derivates.
|
|
* Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2.
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/spinlock.h>
|
|
#include <asm/amd_nb.h>
|
|
|
|
static u32 *flush_words;
|
|
|
|
const struct pci_device_id amd_nb_misc_ids[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
|
|
{}
|
|
};
|
|
EXPORT_SYMBOL(amd_nb_misc_ids);
|
|
|
|
static struct pci_device_id amd_nb_link_ids[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
|
|
{}
|
|
};
|
|
|
|
const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
|
|
{ 0x00, 0x18, 0x20 },
|
|
{ 0xff, 0x00, 0x20 },
|
|
{ 0xfe, 0x00, 0x20 },
|
|
{ }
|
|
};
|
|
|
|
struct amd_northbridge_info amd_northbridges;
|
|
EXPORT_SYMBOL(amd_northbridges);
|
|
|
|
static struct pci_dev *next_northbridge(struct pci_dev *dev,
|
|
const struct pci_device_id *ids)
|
|
{
|
|
do {
|
|
dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
|
|
if (!dev)
|
|
break;
|
|
} while (!pci_match_id(ids, dev));
|
|
return dev;
|
|
}
|
|
|
|
int amd_cache_northbridges(void)
|
|
{
|
|
u16 i = 0;
|
|
struct amd_northbridge *nb;
|
|
struct pci_dev *misc, *link;
|
|
|
|
if (amd_nb_num())
|
|
return 0;
|
|
|
|
misc = NULL;
|
|
while ((misc = next_northbridge(misc, amd_nb_misc_ids)) != NULL)
|
|
i++;
|
|
|
|
if (i == 0)
|
|
return 0;
|
|
|
|
nb = kzalloc(i * sizeof(struct amd_northbridge), GFP_KERNEL);
|
|
if (!nb)
|
|
return -ENOMEM;
|
|
|
|
amd_northbridges.nb = nb;
|
|
amd_northbridges.num = i;
|
|
|
|
link = misc = NULL;
|
|
for (i = 0; i != amd_nb_num(); i++) {
|
|
node_to_amd_nb(i)->misc = misc =
|
|
next_northbridge(misc, amd_nb_misc_ids);
|
|
node_to_amd_nb(i)->link = link =
|
|
next_northbridge(link, amd_nb_link_ids);
|
|
}
|
|
|
|
/* some CPU families (e.g. family 0x11) do not support GART */
|
|
if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10 ||
|
|
boot_cpu_data.x86 == 0x15)
|
|
amd_northbridges.flags |= AMD_NB_GART;
|
|
|
|
/*
|
|
* Some CPU families support L3 Cache Index Disable. There are some
|
|
* limitations because of E382 and E388 on family 0x10.
|
|
*/
|
|
if (boot_cpu_data.x86 == 0x10 &&
|
|
boot_cpu_data.x86_model >= 0x8 &&
|
|
(boot_cpu_data.x86_model > 0x9 ||
|
|
boot_cpu_data.x86_mask >= 0x1))
|
|
amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
|
|
|
|
if (boot_cpu_data.x86 == 0x15)
|
|
amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
|
|
|
|
/* L3 cache partitioning is supported on family 0x15 */
|
|
if (boot_cpu_data.x86 == 0x15)
|
|
amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(amd_cache_northbridges);
|
|
|
|
/*
|
|
* Ignores subdevice/subvendor but as far as I can figure out
|
|
* they're useless anyways
|
|
*/
|
|
bool __init early_is_amd_nb(u32 device)
|
|
{
|
|
const struct pci_device_id *id;
|
|
u32 vendor = device & 0xffff;
|
|
|
|
device >>= 16;
|
|
for (id = amd_nb_misc_ids; id->vendor; id++)
|
|
if (vendor == id->vendor && device == id->device)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
int amd_get_subcaches(int cpu)
|
|
{
|
|
struct pci_dev *link = node_to_amd_nb(amd_get_nb_id(cpu))->link;
|
|
unsigned int mask;
|
|
int cuid = 0;
|
|
|
|
if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
|
|
return 0;
|
|
|
|
pci_read_config_dword(link, 0x1d4, &mask);
|
|
|
|
#ifdef CONFIG_SMP
|
|
cuid = cpu_data(cpu).compute_unit_id;
|
|
#endif
|
|
return (mask >> (4 * cuid)) & 0xf;
|
|
}
|
|
|
|
int amd_set_subcaches(int cpu, int mask)
|
|
{
|
|
static unsigned int reset, ban;
|
|
struct amd_northbridge *nb = node_to_amd_nb(amd_get_nb_id(cpu));
|
|
unsigned int reg;
|
|
int cuid = 0;
|
|
|
|
if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
|
|
return -EINVAL;
|
|
|
|
/* if necessary, collect reset state of L3 partitioning and BAN mode */
|
|
if (reset == 0) {
|
|
pci_read_config_dword(nb->link, 0x1d4, &reset);
|
|
pci_read_config_dword(nb->misc, 0x1b8, &ban);
|
|
ban &= 0x180000;
|
|
}
|
|
|
|
/* deactivate BAN mode if any subcaches are to be disabled */
|
|
if (mask != 0xf) {
|
|
pci_read_config_dword(nb->misc, 0x1b8, ®);
|
|
pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
cuid = cpu_data(cpu).compute_unit_id;
|
|
#endif
|
|
mask <<= 4 * cuid;
|
|
mask |= (0xf ^ (1 << cuid)) << 26;
|
|
|
|
pci_write_config_dword(nb->link, 0x1d4, mask);
|
|
|
|
/* reset BAN mode if L3 partitioning returned to reset state */
|
|
pci_read_config_dword(nb->link, 0x1d4, ®);
|
|
if (reg == reset) {
|
|
pci_read_config_dword(nb->misc, 0x1b8, ®);
|
|
reg &= ~0x180000;
|
|
pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int amd_cache_gart(void)
|
|
{
|
|
u16 i;
|
|
|
|
if (!amd_nb_has_feature(AMD_NB_GART))
|
|
return 0;
|
|
|
|
flush_words = kmalloc(amd_nb_num() * sizeof(u32), GFP_KERNEL);
|
|
if (!flush_words) {
|
|
amd_northbridges.flags &= ~AMD_NB_GART;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i != amd_nb_num(); i++)
|
|
pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c,
|
|
&flush_words[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void amd_flush_garts(void)
|
|
{
|
|
int flushed, i;
|
|
unsigned long flags;
|
|
static DEFINE_SPINLOCK(gart_lock);
|
|
|
|
if (!amd_nb_has_feature(AMD_NB_GART))
|
|
return;
|
|
|
|
/* 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 < amd_nb_num(); i++) {
|
|
pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
|
|
flush_words[i] | 1);
|
|
flushed++;
|
|
}
|
|
for (i = 0; i < amd_nb_num(); i++) {
|
|
u32 w;
|
|
/* Make sure the hardware actually executed the flush*/
|
|
for (;;) {
|
|
pci_read_config_dword(node_to_amd_nb(i)->misc,
|
|
0x9c, &w);
|
|
if (!(w & 1))
|
|
break;
|
|
cpu_relax();
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&gart_lock, flags);
|
|
if (!flushed)
|
|
printk("nothing to flush?\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(amd_flush_garts);
|
|
|
|
static __init int init_amd_nbs(void)
|
|
{
|
|
int err = 0;
|
|
|
|
err = amd_cache_northbridges();
|
|
|
|
if (err < 0)
|
|
printk(KERN_NOTICE "AMD NB: Cannot enumerate AMD northbridges.\n");
|
|
|
|
if (amd_cache_gart() < 0)
|
|
printk(KERN_NOTICE "AMD NB: Cannot initialize GART flush words, "
|
|
"GART support disabled.\n");
|
|
|
|
return err;
|
|
}
|
|
|
|
/* This has to go after the PCI subsystem */
|
|
fs_initcall(init_amd_nbs);
|