[linux-2.6-block.git] / arch / x86_64 / 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, 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;

	num_k8_northbridges = 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;

	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[] = {
	19	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1103) },
	20	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1203) },
	21	{}
	22	};
	23	EXPORT_SYMBOL(k8_nb_ids);
	24
	25	struct pci_dev **k8_northbridges;
	26	EXPORT_SYMBOL(k8_northbridges);
	27
	28	static struct pci_dev next_k8_northbridge(struct pci_dev dev)
	29	{
	30	do {
	31	dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
	32	if (!dev)
	33	break;
	34	} while (!pci_match_id(&k8_nb_ids[0], dev));
	35	return dev;
	36	}
	37
	38	int cache_k8_northbridges(void)
	39	{
	40	int i;
	41	struct pci_dev *dev;
	42	if (num_k8_northbridges)
	43	return 0;
	44
	45	num_k8_northbridges = 0;
	46	dev = NULL;
	47	while ((dev = next_k8_northbridge(dev)) != NULL)
	48	num_k8_northbridges++;
	49
	50	k8_northbridges = kmalloc((num_k8_northbridges + 1) * sizeof(void *),
	51	GFP_KERNEL);
	52	if (!k8_northbridges)
	53	return -ENOMEM;
	54
	55	flush_words = kmalloc(num_k8_northbridges * sizeof(u32), GFP_KERNEL);
	56	if (!flush_words) {
	57	kfree(k8_northbridges);
	58	return -ENOMEM;
	59	}
	60
	61	dev = NULL;
	62	i = 0;
	63	while ((dev = next_k8_northbridge(dev)) != NULL) {
6f29e35e BP	64	k8_northbridges[i] = dev;
6f29e35e BP	65	pci_read_config_dword(dev, 0x9c, &flush_words[i++]);
a32073bf AK	66	}
	67	k8_northbridges[i] = NULL;
	68	return 0;
	69	}
	70	EXPORT_SYMBOL_GPL(cache_k8_northbridges);
	71
	72	/* Ignores subdevice/subvendor but as far as I can figure out
	73	they're useless anyways */
	74	int __init early_is_k8_nb(u32 device)
	75	{
	76	struct pci_device_id *id;
	77	u32 vendor = device & 0xffff;
	78	device >>= 16;
	79	for (id = k8_nb_ids; id->vendor; id++)
	80	if (vendor == id->vendor && device == id->device)
	81	return 1;
	82	return 0;
	83	}
	84
	85	void k8_flush_garts(void)
	86	{
	87	int flushed, i;
	88	unsigned long flags;
	89	static DEFINE_SPINLOCK(gart_lock);
	90
	91	/* Avoid races between AGP and IOMMU. In theory it's not needed
	92	but I'm not sure if the hardware won't lose flush requests
	93	when another is pending. This whole thing is so expensive anyways
	94	that it doesn't matter to serialize more. -AK */
	95	spin_lock_irqsave(&gart_lock, flags);
	96	flushed = 0;
	97	for (i = 0; i < num_k8_northbridges; i++) {
	98	pci_write_config_dword(k8_northbridges[i], 0x9c,
	99	flush_words[i]\|1);
	100	flushed++;
	101	}
	102	for (i = 0; i < num_k8_northbridges; i++) {
	103	u32 w;
	104	/* Make sure the hardware actually executed the flush*/
	105	for (;;) {
	106	pci_read_config_dword(k8_northbridges[i],
	107	0x9c, &w);
	108	if (!(w & 1))
	109	break;
	110	cpu_relax();
	111	}
	112	}
	113	spin_unlock_irqrestore(&gart_lock, flags);
	114	if (!flushed)
	115	printk("nothing to flush?\n");
	116	}
	117	EXPORT_SYMBOL_GPL(k8_flush_garts);
	118