[deliverable/linux.git] / arch / x86 / pci / common.c

/*
 *	Low-Level PCI Support for PC
 *
 *	(c) 1999--2000 Martin Mares <mj@ucw.cz>
 */

#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/dmi.h>

#include <asm/acpi.h>
#include <asm/segment.h>
#include <asm/io.h>
#include <asm/smp.h>

#include "pci.h"

unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
				PCI_PROBE_MMCONF;

static int pci_bf_sort;
int pci_routeirq;
int pcibios_last_bus = -1;
unsigned long pirq_table_addr;
struct pci_bus *pci_root_bus;
struct pci_raw_ops *raw_pci_ops;

static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
{
	return raw_pci_ops->read(pci_domain_nr(bus), bus->number,
				 devfn, where, size, value);
}

static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
{
	return raw_pci_ops->write(pci_domain_nr(bus), bus->number,
				  devfn, where, size, value);
}

struct pci_ops pci_root_ops = {
	.read = pci_read,
	.write = pci_write,
};

/*
 * legacy, numa, and acpi all want to call pcibios_scan_root
 * from their initcalls. This flag prevents that.
 */
int pcibios_scanned;

/*
 * This interrupt-safe spinlock protects all accesses to PCI
 * configuration space.
 */
DEFINE_SPINLOCK(pci_config_lock);

/*
 * Several buggy motherboards address only 16 devices and mirror
 * them to next 16 IDs. We try to detect this `feature' on all
 * primary buses (those containing host bridges as they are
 * expected to be unique) and remove the ghost devices.
 */

static void __devinit pcibios_fixup_ghosts(struct pci_bus *b)
{
	struct list_head *ln, *mn;
	struct pci_dev *d, *e;
	int mirror = PCI_DEVFN(16,0);
	int seen_host_bridge = 0;
	int i;

	DBG("PCI: Scanning for ghost devices on bus %d\n", b->number);
	list_for_each(ln, &b->devices) {
		d = pci_dev_b(ln);
		if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
			seen_host_bridge++;
		for (mn=ln->next; mn != &b->devices; mn=mn->next) {
			e = pci_dev_b(mn);
			if (e->devfn != d->devfn + mirror ||
			    e->vendor != d->vendor ||
			    e->device != d->device ||
			    e->class != d->class)
				continue;
			for(i=0; i<PCI_NUM_RESOURCES; i++)
				if (e->resource[i].start != d->resource[i].start ||
				    e->resource[i].end != d->resource[i].end ||
				    e->resource[i].flags != d->resource[i].flags)
					continue;
			break;
		}
		if (mn == &b->devices)
			return;
	}
	if (!seen_host_bridge)
		return;
	printk(KERN_WARNING "PCI: Ignoring ghost devices on bus %02x\n", b->number);

	ln = &b->devices;
	while (ln->next != &b->devices) {
		d = pci_dev_b(ln->next);
		if (d->devfn >= mirror) {
			list_del(&d->global_list);
			list_del(&d->bus_list);
			kfree(d);
		} else
			ln = ln->next;
	}
}

/*
 *  Called after each bus is probed, but before its children
 *  are examined.
 */

void __devinit  pcibios_fixup_bus(struct pci_bus *b)
{
	pcibios_fixup_ghosts(b);
	pci_read_bridge_bases(b);
}

/*
 * Only use DMI information to set this if nothing was passed
 * on the kernel command line (which was parsed earlier).
 */

static int __devinit set_bf_sort(const struct dmi_system_id *d)
{
	if (pci_bf_sort == pci_bf_sort_default) {
		pci_bf_sort = pci_dmi_bf;
		printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
	}
	return 0;
}

/*
 * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
 */
#ifdef __i386__
static int __devinit assign_all_busses(const struct dmi_system_id *d)
{
	pci_probe |= PCI_ASSIGN_ALL_BUSSES;
	printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
			" (pci=assign-busses)\n", d->ident);
	return 0;
}
#endif

static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
#ifdef __i386__
/*
 * Laptops which need pci=assign-busses to see Cardbus cards
 */
	{
		.callback = assign_all_busses,
		.ident = "Samsung X20 Laptop",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
			DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
		},
	},
#endif		/* __i386__ */
	{
		.callback = set_bf_sort,
		.ident = "Dell PowerEdge 1950",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "Dell PowerEdge 1955",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "Dell PowerEdge 2900",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "Dell PowerEdge 2950",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "Dell PowerEdge R900",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
			DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL20p G3",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL20p G4",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL30p G1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL25p G1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL35p G1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL45p G1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL45p G2",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL460c G1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL465c G1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL480c G1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
		},
	},
	{
		.callback = set_bf_sort,
		.ident = "HP ProLiant BL685c G1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "HP"),
			DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
		},
	},
#ifdef __i386__
	{
		.callback = assign_all_busses,
		.ident = "Compaq EVO N800c",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
			DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
		},
	},
#endif
	{}
};

struct pci_bus * __devinit pcibios_scan_root(int busnum)
{
	struct pci_bus *bus = NULL;
	struct pci_sysdata *sd;

	dmi_check_system(pciprobe_dmi_table);

	while ((bus = pci_find_next_bus(bus)) != NULL) {
		if (bus->number == busnum) {
			/* Already scanned */
			return bus;
		}
	}

	/* Allocate per-root-bus (not per bus) arch-specific data.
	 * TODO: leak; this memory is never freed.
	 * It's arguable whether it's worth the trouble to care.
	 */
	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
	if (!sd) {
		printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
		return NULL;
	}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Low-Level PCI Support for PC
	3	*
	4	* (c) 1999--2000 Martin Mares <mj@ucw.cz>
	5	*/
	6
	7	#include <linux/sched.h>
	8	#include <linux/pci.h>
	9	#include <linux/ioport.h>
	10	#include <linux/init.h>
8c4b2cf9	11	#include <linux/dmi.h>
1da177e4 LT	12
	13	#include <asm/acpi.h>
	14	#include <asm/segment.h>
	15	#include <asm/io.h>
	16	#include <asm/smp.h>
	17
	18	#include "pci.h"
	19
1da177e4 LT	20	unsigned int pci_probe = PCI_PROBE_BIOS \| PCI_PROBE_CONF1 \| PCI_PROBE_CONF2 \|
	21	PCI_PROBE_MMCONF;
	22
2b290da0	23	static int pci_bf_sort;
1da177e4 LT	24	int pci_routeirq;
1da177e4 LT	25	int pcibios_last_bus = -1;
120bb424	26	unsigned long pirq_table_addr;
120bb424	27	struct pci_bus *pci_root_bus;
1da177e4 LT	28	struct pci_raw_ops *raw_pci_ops;
	29
	30	static int pci_read(struct pci_bus bus, unsigned int devfn, int where, int size, u32 value)
	31	{
a79e4198 JG	32	return raw_pci_ops->read(pci_domain_nr(bus), bus->number,
a79e4198 JG	33	devfn, where, size, value);
1da177e4 LT	34	}
	35
	36	static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
	37	{
a79e4198 JG	38	return raw_pci_ops->write(pci_domain_nr(bus), bus->number,
a79e4198 JG	39	devfn, where, size, value);
1da177e4 LT	40	}
	41
	42	struct pci_ops pci_root_ops = {
	43	.read = pci_read,
	44	.write = pci_write,
	45	};
	46
	47	/*
	48	* legacy, numa, and acpi all want to call pcibios_scan_root
	49	* from their initcalls. This flag prevents that.
	50	*/
	51	int pcibios_scanned;
	52
	53	/*
	54	* This interrupt-safe spinlock protects all accesses to PCI
	55	* configuration space.
	56	*/
	57	DEFINE_SPINLOCK(pci_config_lock);
	58
	59	/*
	60	* Several buggy motherboards address only 16 devices and mirror
	61	* them to next 16 IDs. We try to detect this `feature' on all
	62	* primary buses (those containing host bridges as they are
	63	* expected to be unique) and remove the ghost devices.
	64	*/
	65
	66	static void __devinit pcibios_fixup_ghosts(struct pci_bus *b)
	67	{
	68	struct list_head ln, mn;
	69	struct pci_dev d, e;
	70	int mirror = PCI_DEVFN(16,0);
	71	int seen_host_bridge = 0;
	72	int i;
	73
	74	DBG("PCI: Scanning for ghost devices on bus %d\n", b->number);
	75	list_for_each(ln, &b->devices) {
	76	d = pci_dev_b(ln);
	77	if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
	78	seen_host_bridge++;
	79	for (mn=ln->next; mn != &b->devices; mn=mn->next) {
	80	e = pci_dev_b(mn);
	81	if (e->devfn != d->devfn + mirror \|\|
	82	e->vendor != d->vendor \|\|
	83	e->device != d->device \|\|
	84	e->class != d->class)
	85	continue;
	86	for(i=0; i<PCI_NUM_RESOURCES; i++)
	87	if (e->resource[i].start != d->resource[i].start \|\|
	88	e->resource[i].end != d->resource[i].end \|\|
	89	e->resource[i].flags != d->resource[i].flags)
	90	continue;
	91	break;
	92	}
	93	if (mn == &b->devices)
	94	return;
	95	}
	96	if (!seen_host_bridge)
	97	return;
	98	printk(KERN_WARNING "PCI: Ignoring ghost devices on bus %02x\n", b->number);
	99
	100	ln = &b->devices;
	101	while (ln->next != &b->devices) {
	102	d = pci_dev_b(ln->next);
	103	if (d->devfn >= mirror) {
104	list_del(&d->global_list);
105	list_del(&d->bus_list);
106	kfree(d);
107	} else
108	ln = ln->next;
109	}
110	}
111
112	/*
113	* Called after each bus is probed, but before its children
114	* are examined.
115	*/
116
117	void __devinit pcibios_fixup_bus(struct pci_bus *b)
118	{
119	pcibios_fixup_ghosts(b);
120	pci_read_bridge_bases(b);
121	}
122
6b4b78fe MD	123	/*
	124	* Only use DMI information to set this if nothing was passed
	125	* on the kernel command line (which was parsed earlier).
	126	*/
	127
1855256c	128	static int __devinit set_bf_sort(const struct dmi_system_id *d)
6b4b78fe MD	129	{
	130	if (pci_bf_sort == pci_bf_sort_default) {
	131	pci_bf_sort = pci_dmi_bf;
	132	printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
	133	}
	134	return 0;
	135	}
	136
8c4b2cf9 BK	137	/*
	138	* Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
	139	*/
	140	#ifdef __i386__
1855256c	141	static int __devinit assign_all_busses(const struct dmi_system_id *d)
8c4b2cf9 BK	142	{
	143	pci_probe \|= PCI_ASSIGN_ALL_BUSSES;
	144	printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
	145	" (pci=assign-busses)\n", d->ident);
	146	return 0;
	147	}
	148	#endif
	149
6b4b78fe MD	150	static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
6b4b78fe MD	151	#ifdef __i386__
8c4b2cf9 BK	152	/*
	153	* Laptops which need pci=assign-busses to see Cardbus cards
	154	*/
8c4b2cf9 BK	155	{
	156	.callback = assign_all_busses,
	157	.ident = "Samsung X20 Laptop",
	158	.matches = {
	159	DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
	160	DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
	161	},
	162	},
	163	#endif /* __i386__ */
6b4b78fe MD	164	{
	165	.callback = set_bf_sort,
	166	.ident = "Dell PowerEdge 1950",
	167	.matches = {
	168	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	169	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
	170	},
	171	},
	172	{
	173	.callback = set_bf_sort,
	174	.ident = "Dell PowerEdge 1955",
	175	.matches = {
	176	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	177	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
	178	},
	179	},
	180	{
	181	.callback = set_bf_sort,
	182	.ident = "Dell PowerEdge 2900",
	183	.matches = {
	184	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	185	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
	186	},
	187	},
	188	{
	189	.callback = set_bf_sort,
	190	.ident = "Dell PowerEdge 2950",
	191	.matches = {
	192	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	193	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
	194	},
	195	},
f7a9dae7 MD	196	{
	197	.callback = set_bf_sort,
	198	.ident = "Dell PowerEdge R900",
	199	.matches = {
	200	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	201	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
	202	},
	203	},
f52383d3 AG	204	{
	205	.callback = set_bf_sort,
	206	.ident = "HP ProLiant BL20p G3",
	207	.matches = {
	208	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	209	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
	210	},
	211	},
	212	{
	213	.callback = set_bf_sort,
	214	.ident = "HP ProLiant BL20p G4",
	215	.matches = {
	216	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	217	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
	218	},
	219	},
	220	{
	221	.callback = set_bf_sort,
	222	.ident = "HP ProLiant BL30p G1",
	223	.matches = {
	224	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	225	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
	226	},
	227	},
	228	{
	229	.callback = set_bf_sort,
	230	.ident = "HP ProLiant BL25p G1",
	231	.matches = {
	232	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	233	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
	234	},
	235	},
	236	{
	237	.callback = set_bf_sort,
	238	.ident = "HP ProLiant BL35p G1",
	239	.matches = {
	240	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	241	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
	242	},
	243	},
	244	{
	245	.callback = set_bf_sort,
	246	.ident = "HP ProLiant BL45p G1",
	247	.matches = {
	248	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	249	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
	250	},
	251	},
	252	{
	253	.callback = set_bf_sort,
	254	.ident = "HP ProLiant BL45p G2",
	255	.matches = {
	256	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	257	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
	258	},
	259	},
	260	{
	261	.callback = set_bf_sort,
	262	.ident = "HP ProLiant BL460c G1",
	263	.matches = {
	264	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
	265	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
	266	},
	267	},
268	{
269	.callback = set_bf_sort,
270	.ident = "HP ProLiant BL465c G1",
271	.matches = {
272	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
273	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
274	},
275	},
276	{
277	.callback = set_bf_sort,
278	.ident = "HP ProLiant BL480c G1",
279	.matches = {
280	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
281	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
282	},
283	},
284	{
285	.callback = set_bf_sort,
286	.ident = "HP ProLiant BL685c G1",
287	.matches = {
288	DMI_MATCH(DMI_SYS_VENDOR, "HP"),
289	DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
290	},
291	},
5b1ea82f JL	292	#ifdef __i386__
	293	{
	294	.callback = assign_all_busses,
	295	.ident = "Compaq EVO N800c",
	296	.matches = {
	297	DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
	298	DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
	299	},
	300	},
	301	#endif
8c4b2cf9 BK	302	{}
8c4b2cf9 BK	303	};
1da177e4 LT	304
	305	struct pci_bus * __devinit pcibios_scan_root(int busnum)
	306	{
	307	struct pci_bus *bus = NULL;
08f1c192	308	struct pci_sysdata *sd;
1da177e4	309
8c4b2cf9 BK	310	dmi_check_system(pciprobe_dmi_table);
8c4b2cf9 BK	311
1da177e4 LT	312	while ((bus = pci_find_next_bus(bus)) != NULL) {
	313	if (bus->number == busnum) {
	314	/* Already scanned */
	315	return bus;
	316	}
	317	}
	318
08f1c192 MBY	319	/* Allocate per-root-bus (not per bus) arch-specific data.
	320	* TODO: leak; this memory is never freed.
	321	* It's arguable whether it's worth the trouble to care.
	322	*/
	323	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
	324	if (!sd) {
	325	printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
	326	return NULL;
	327	}
	328