WebSVN - shark - Blame - Rev 1618 - /shark/branches/xen/drivers/pci/setup-res.c

Rev	Author	Line No.	Line
587	giacomo	1	/*
		2	* drivers/pci/setup-res.c
		3	*
		4	* Extruded from code written by
		5	* Dave Rusling (david.rusling@reo.mts.dec.com)
		6	* David Mosberger (davidm@cs.arizona.edu)
		7	* David Miller (davem@redhat.com)
		8	*
		9	* Support routines for initializing a PCI subsystem.
		10	*/
		11
		12	/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
		13
		14	/*
		15	* Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
		16	* Resource sorting
		17	*/
		18
		19	#include <linuxcomp.h>
		20
		21	#include <linux/init.h>
		22	#include <linux/kernel.h>
		23	#include <linux/pci.h>
		24	#include <linux/errno.h>
		25	#include <linux/ioport.h>
		26	#include <linux/cache.h>
		27	#include <linux/slab.h>
		28	#include "pci.h"
		29
		30	#define DEBUG_CONFIG 0
		31	#if DEBUG_CONFIG
		32	# define DBGC(args) printk args
		33	#else
		34	# define DBGC(args)
		35	#endif
		36
		37
		38	static void
		39	pci_update_resource(struct pci_dev dev, struct resource res, int resno)
		40	{
		41	struct pci_bus_region region;
		42	u32 new, check, mask;
		43	int reg;
		44
		45	pcibios_resource_to_bus(dev, &region, res);
		46
		47	DBGC((KERN_ERR " got res [%lx:%lx] bus [%lx:%lx] flags %lx for "
		48	"BAR %d of %s\n", res->start, res->end,
		49	region.start, region.end, res->flags,
		50	resno, pci_name(dev)));
		51
		52	new = region.start \| (res->flags & PCI_REGION_FLAG_MASK);
		53	if (res->flags & IORESOURCE_IO)
		54	mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
		55	else
		56	mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
		57
		58	if (resno < 6) {
		59	reg = PCI_BASE_ADDRESS_0 + 4 * resno;
		60	} else if (resno == PCI_ROM_RESOURCE) {
		61	new \|= res->flags & PCI_ROM_ADDRESS_ENABLE;
		62	reg = dev->rom_base_reg;
		63	} else {
		64	/* Hmm, non-standard resource. */
		65	BUG();
		66	return; /* kill uninitialised var warning */
		67	}
		68
		69	pci_write_config_dword(dev, reg, new);
		70	pci_read_config_dword(dev, reg, &check);
		71
		72	if ((new ^ check) & mask) {
		73	printk(KERN_ERR "PCI: Error while updating region "
		74	"%s/%d (%08x != %08x)\n", pci_name(dev), resno,
		75	new, check);
		76	}
		77
		78	if ((new & (PCI_BASE_ADDRESS_SPACE\|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
		79	(PCI_BASE_ADDRESS_SPACE_MEMORY\|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
		80	new = 0; /* currently everyone zeros the high address */
		81	pci_write_config_dword(dev, reg + 4, new);
		82	pci_read_config_dword(dev, reg + 4, &check);
		83	if (check != new) {
		84	printk(KERN_ERR "PCI: Error updating region "
		85	"%s/%d (high %08x != %08x)\n",
		86	pci_name(dev), resno, new, check);
		87	}
		88	}
		89	}
		90
		91	int __init
		92	pci_claim_resource(struct pci_dev *dev, int resource)
		93	{
		94	struct resource *res = &dev->resource[resource];
		95	struct resource *root = pci_find_parent_resource(dev, res);
		96	char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
		97	int err;
		98
		99	err = -EINVAL;
		100	if (root != NULL)
		101	err = request_resource(root, res);
		102
		103	if (err) {
		104	printk(KERN_ERR "PCI: %s region %d of %s %s [%lx:%lx]\n",
		105	root ? "Address space collision on" :
		106	"No parent found for",
		107	resource, dtype, pci_name(dev), res->start, res->end);
		108	}
		109
		110	return err;
		111	}
		112
		113	int pci_assign_resource(struct pci_dev *dev, int resno)
		114	{
		115	struct pci_bus *bus = dev->bus;
		116	struct resource *res = dev->resource + resno;
		117	unsigned long size, min, align;
		118	int ret;
		119
		120	size = res->end - res->start + 1;
		121	min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
		122	/* The bridge resources are special, as their
		123	size != alignment. Sizing routines return
		124	required alignment in the "start" field. */
		125	align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
		126
		127	/* First, try exact prefetching match.. */
		128	ret = pci_bus_alloc_resource(bus, res, size, align, min,
		129	IORESOURCE_PREFETCH,
		130	pcibios_align_resource, dev);
		131
		132	if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
		133	/*
		134	* That failed.
		135	*
		136	* But a prefetching area can handle a non-prefetching
		137	* window (it will just not perform as well).
		138	*/
		139	ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
		140	pcibios_align_resource, dev);
		141	}
		142
		143	if (ret) {
		144	printk(KERN_ERR "PCI: Failed to allocate resource %d(%lx-%lx) for %s\n",
		145	resno, res->start, res->end, pci_name(dev));
		146	} else if (resno < PCI_BRIDGE_RESOURCES) {
		147	pci_update_resource(dev, res, resno);
		148	}
		149
		150	return ret;
		151	}
		152
		153	/* Sort resources by alignment */
		154	void __devinit
		155	pdev_sort_resources(struct pci_dev dev, struct resource_list head)
		156	{
		157	int i;
		158
		159	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
		160	struct resource *r;
		161	struct resource_list list, tmp;
		162	unsigned long r_align;
		163
		164	r = &dev->resource[i];
		165	r_align = r->end - r->start;
		166
		167	if (!(r->flags) \|\| r->parent)
		168	continue;
		169	if (!r_align) {
		170	printk(KERN_WARNING "PCI: Ignore bogus resource %d "
		171	"[%lx:%lx] of %s\n",
		172	i, r->start, r->end, pci_name(dev));
		173	continue;
		174	}
		175	r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
		176	for (list = head; ; list = list->next) {
		177	unsigned long align = 0;
		178	struct resource_list *ln = list->next;
		179	int idx;
		180
		181	if (ln) {
		182	idx = ln->res - &ln->dev->resource[0];
		183	align = (idx < PCI_BRIDGE_RESOURCES) ?
		184	ln->res->end - ln->res->start + 1 :
		185	ln->res->start;
		186	}
		187	if (r_align > align) {
		188	tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
		189	if (!tmp)
		190	panic("pdev_sort_resources(): "
		191	"kmalloc() failed!\n");
		192	tmp->next = ln;
		193	tmp->res = r;
		194	tmp->dev = dev;
		195	list->next = tmp;
		196	break;
		197	}
		198	}
		199	}
		200	}

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