[deliverable/linux.git] / arch / i386 / 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(0, 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(0, 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(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(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"),
		},
	},
	{}
};

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

	dmi_check_system(pciprobe_dmi_table);

	while ((bus = pci_find_next_bus(bus)) != NULL) {
		if (bus->number == busnum) {
			/* Already scanned */
			return bus;
		}
	}
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	{
	32	return raw_pci_ops->read(0, bus->number, devfn, where, size, value);
	33	}
	34
	35	static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
	36	{
	37	return raw_pci_ops->write(0, bus->number, devfn, where, size, value);
	38	}
	39
	40	struct pci_ops pci_root_ops = {
	41	.read = pci_read,
	42	.write = pci_write,
	43	};
	44
	45	/*
	46	* legacy, numa, and acpi all want to call pcibios_scan_root
	47	* from their initcalls. This flag prevents that.
	48	*/
	49	int pcibios_scanned;
	50
	51	/*
	52	* This interrupt-safe spinlock protects all accesses to PCI
	53	* configuration space.
	54	*/
	55	DEFINE_SPINLOCK(pci_config_lock);
	56
	57	/*
	58	* Several buggy motherboards address only 16 devices and mirror
	59	* them to next 16 IDs. We try to detect this `feature' on all
	60	* primary buses (those containing host bridges as they are
	61	* expected to be unique) and remove the ghost devices.
	62	*/
	63
	64	static void __devinit pcibios_fixup_ghosts(struct pci_bus *b)
	65	{
	66	struct list_head ln, mn;
	67	struct pci_dev d, e;
	68	int mirror = PCI_DEVFN(16,0);
	69	int seen_host_bridge = 0;
	70	int i;
	71
	72	DBG("PCI: Scanning for ghost devices on bus %d\n", b->number);
	73	list_for_each(ln, &b->devices) {
	74	d = pci_dev_b(ln);
	75	if ((d->class >> 8) == PCI_CLASS_BRIDGE_HOST)
	76	seen_host_bridge++;
	77	for (mn=ln->next; mn != &b->devices; mn=mn->next) {
	78	e = pci_dev_b(mn);
	79	if (e->devfn != d->devfn + mirror \|\|
	80	e->vendor != d->vendor \|\|
	81	e->device != d->device \|\|
	82	e->class != d->class)
	83	continue;
	84	for(i=0; i<PCI_NUM_RESOURCES; i++)
	85	if (e->resource[i].start != d->resource[i].start \|\|
	86	e->resource[i].end != d->resource[i].end \|\|
	87	e->resource[i].flags != d->resource[i].flags)
	88	continue;
	89	break;
	90	}
	91	if (mn == &b->devices)
92	return;
93	}
94	if (!seen_host_bridge)
95	return;
96	printk(KERN_WARNING "PCI: Ignoring ghost devices on bus %02x\n", b->number);
97
98	ln = &b->devices;
99	while (ln->next != &b->devices) {
100	d = pci_dev_b(ln->next);
101	if (d->devfn >= mirror) {
102	list_del(&d->global_list);
103	list_del(&d->bus_list);
104	kfree(d);
105	} else
106	ln = ln->next;
107	}
108	}
109
110	/*
111	* Called after each bus is probed, but before its children
112	* are examined.
113	*/
114
115	void __devinit pcibios_fixup_bus(struct pci_bus *b)
116	{
117	pcibios_fixup_ghosts(b);
118	pci_read_bridge_bases(b);
119	}
120
6b4b78fe MD	121	/*
	122	* Only use DMI information to set this if nothing was passed
	123	* on the kernel command line (which was parsed earlier).
	124	*/
	125
	126	static int __devinit set_bf_sort(struct dmi_system_id *d)
	127	{
	128	if (pci_bf_sort == pci_bf_sort_default) {
	129	pci_bf_sort = pci_dmi_bf;
	130	printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
	131	}
	132	return 0;
	133	}
	134
8c4b2cf9 BK	135	/*
	136	* Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
	137	*/
	138	#ifdef __i386__
	139	static int __devinit assign_all_busses(struct dmi_system_id *d)
	140	{
	141	pci_probe \|= PCI_ASSIGN_ALL_BUSSES;
	142	printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
	143	" (pci=assign-busses)\n", d->ident);
	144	return 0;
	145	}
	146	#endif
	147
6b4b78fe MD	148	static struct dmi_system_id __devinitdata pciprobe_dmi_table[] = {
6b4b78fe MD	149	#ifdef __i386__
8c4b2cf9 BK	150	/*
	151	* Laptops which need pci=assign-busses to see Cardbus cards
	152	*/
8c4b2cf9 BK	153	{
	154	.callback = assign_all_busses,
	155	.ident = "Samsung X20 Laptop",
	156	.matches = {
	157	DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
	158	DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
	159	},
	160	},
	161	#endif /* __i386__ */
6b4b78fe MD	162	{
	163	.callback = set_bf_sort,
	164	.ident = "Dell PowerEdge 1950",
	165	.matches = {
	166	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	167	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
	168	},
	169	},
	170	{
	171	.callback = set_bf_sort,
	172	.ident = "Dell PowerEdge 1955",
	173	.matches = {
	174	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	175	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
	176	},
	177	},
	178	{
	179	.callback = set_bf_sort,
	180	.ident = "Dell PowerEdge 2900",
	181	.matches = {
	182	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	183	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
	184	},
	185	},
	186	{
	187	.callback = set_bf_sort,
	188	.ident = "Dell PowerEdge 2950",
	189	.matches = {
	190	DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
	191	DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
	192	},
	193	},
8c4b2cf9 BK	194	{}
8c4b2cf9 BK	195	};
1da177e4 LT	196
	197	struct pci_bus * __devinit pcibios_scan_root(int busnum)
	198	{
	199	struct pci_bus *bus = NULL;
	200
8c4b2cf9 BK	201	dmi_check_system(pciprobe_dmi_table);
8c4b2cf9 BK	202
1da177e4 LT	203	while ((bus = pci_find_next_bus(bus)) != NULL) {
	204	if (bus->number == busnum) {
	205	/* Already scanned */
	206	return bus;
	207	}
	208	}
	209