[deliverable/linux.git] / arch / x86 / kernel / k8.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, 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_11H_NB_MISC) },
	{}
};
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);
Commit	Line	Data
a32073bf AK	1	/*
	2	* Shared support code for AMD K8 northbridges and derivates.
	3	* Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2.
	4	*/
	5	#include <linux/gfp.h>
	6	#include <linux/types.h>
	7	#include <linux/init.h>
	8	#include <linux/errno.h>
	9	#include <linux/module.h>
	10	#include <linux/spinlock.h>
	11	#include <asm/k8.h>
	12
	13	int num_k8_northbridges;
	14	EXPORT_SYMBOL(num_k8_northbridges);
	15
	16	static u32 *flush_words;
	17
	18	struct pci_device_id k8_nb_ids[] = {
cf169702 JR	19	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
	20	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
	21	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
a32073bf AK	22	{}
	23	};
	24	EXPORT_SYMBOL(k8_nb_ids);
	25
	26	struct pci_dev **k8_northbridges;
	27	EXPORT_SYMBOL(k8_northbridges);
	28
	29	static struct pci_dev next_k8_northbridge(struct pci_dev dev)
	30	{
	31	do {
	32	dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
	33	if (!dev)
	34	break;
	35	} while (!pci_match_id(&k8_nb_ids[0], dev));
	36	return dev;
	37	}
	38
	39	int cache_k8_northbridges(void)
	40	{
	41	int i;
	42	struct pci_dev *dev;
3c6df2a9	43
a32073bf AK	44	if (num_k8_northbridges)
	45	return 0;
	46
a32073bf AK	47	dev = NULL;
	48	while ((dev = next_k8_northbridge(dev)) != NULL)
	49	num_k8_northbridges++;
	50
	51	k8_northbridges = kmalloc((num_k8_northbridges + 1) * sizeof(void *),
	52	GFP_KERNEL);
	53	if (!k8_northbridges)
	54	return -ENOMEM;
	55
3c6df2a9 BC	56	if (!num_k8_northbridges) {
	57	k8_northbridges[0] = NULL;
	58	return 0;
	59	}
	60
a32073bf AK	61	flush_words = kmalloc(num_k8_northbridges * sizeof(u32), GFP_KERNEL);
	62	if (!flush_words) {
	63	kfree(k8_northbridges);
	64	return -ENOMEM;
	65	}
	66
	67	dev = NULL;
	68	i = 0;
	69	while ((dev = next_k8_northbridge(dev)) != NULL) {
6f29e35e BP	70	k8_northbridges[i] = dev;
6f29e35e BP	71	pci_read_config_dword(dev, 0x9c, &flush_words[i++]);
a32073bf AK	72	}
	73	k8_northbridges[i] = NULL;
	74	return 0;
	75	}
	76	EXPORT_SYMBOL_GPL(cache_k8_northbridges);
	77
	78	/* Ignores subdevice/subvendor but as far as I can figure out
	79	they're useless anyways */
	80	int __init early_is_k8_nb(u32 device)
	81	{
	82	struct pci_device_id *id;
	83	u32 vendor = device & 0xffff;
	84	device >>= 16;
	85	for (id = k8_nb_ids; id->vendor; id++)
	86	if (vendor == id->vendor && device == id->device)
	87	return 1;
	88	return 0;
	89	}
	90
	91	void k8_flush_garts(void)
	92	{
	93	int flushed, i;
	94	unsigned long flags;
	95	static DEFINE_SPINLOCK(gart_lock);
	96
	97	/* Avoid races between AGP and IOMMU. In theory it's not needed
	98	but I'm not sure if the hardware won't lose flush requests
	99	when another is pending. This whole thing is so expensive anyways
	100	that it doesn't matter to serialize more. -AK */
	101	spin_lock_irqsave(&gart_lock, flags);
	102	flushed = 0;
	103	for (i = 0; i < num_k8_northbridges; i++) {
	104	pci_write_config_dword(k8_northbridges[i], 0x9c,
	105	flush_words[i]\|1);
	106	flushed++;
	107	}
	108	for (i = 0; i < num_k8_northbridges; i++) {
	109	u32 w;
	110	/* Make sure the hardware actually executed the flush*/
	111	for (;;) {
	112	pci_read_config_dword(k8_northbridges[i],
	113	0x9c, &w);
	114	if (!(w & 1))
	115	break;
	116	cpu_relax();
	117	}
	118	}
	119	spin_unlock_irqrestore(&gart_lock, flags);
	120	if (!flushed)
	121	printk("nothing to flush?\n");
	122	}
	123	EXPORT_SYMBOL_GPL(k8_flush_garts);
	124