[deliverable/linux.git] / drivers / pci / setup-res.c

/*
 *	drivers/pci/setup-res.c
 *
 * Extruded from code written by
 *      Dave Rusling (david.rusling@reo.mts.dec.com)
 *      David Mosberger (davidm@cs.arizona.edu)
 *	David Miller (davem@redhat.com)
 *
 * Support routines for initializing a PCI subsystem.
 */

/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */

/*
 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
 *	     Resource sorting
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/cache.h>
#include <linux/slab.h>
#include "pci.h"


void
pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
{
	struct pci_bus_region region;
	u32 new, check, mask;
	int reg;

	/*
	 * Ignore resources for unimplemented BARs and unused resource slots
	 * for 64 bit BARs.
	 */
	if (!res->flags)
		return;

	/*
	 * Ignore non-moveable resources.  This might be legacy resources for
	 * which no functional BAR register exists or another important
	 * system resource we should better not move around in system address
	 * space.
	 */
	if (res->flags & IORESOURCE_PCI_FIXED)
		return;

	pcibios_resource_to_bus(dev, &region, res);

	pr_debug("  got res [%llx:%llx] bus [%llx:%llx] flags %lx for "
		 "BAR %d of %s\n", (unsigned long long)res->start,
		 (unsigned long long)res->end,
		 (unsigned long long)region.start,
		 (unsigned long long)region.end,
		 (unsigned long)res->flags, resno, pci_name(dev));

	new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
	if (res->flags & IORESOURCE_IO)
		mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
	else
		mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;

	if (resno < 6) {
		reg = PCI_BASE_ADDRESS_0 + 4 * resno;
	} else if (resno == PCI_ROM_RESOURCE) {
		if (!(res->flags & IORESOURCE_ROM_ENABLE))
			return;
		new |= PCI_ROM_ADDRESS_ENABLE;
		reg = dev->rom_base_reg;
	} else {
		/* Hmm, non-standard resource. */
	
		return;		/* kill uninitialised var warning */
	}

	pci_write_config_dword(dev, reg, new);
	pci_read_config_dword(dev, reg, &check);

	if ((new ^ check) & mask) {
		printk(KERN_ERR "PCI: Error while updating region "
		       "%s/%d (%08x != %08x)\n", pci_name(dev), resno,
		       new, check);
	}

	if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
	    (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
		new = region.start >> 16 >> 16;
		pci_write_config_dword(dev, reg + 4, new);
		pci_read_config_dword(dev, reg + 4, &check);
		if (check != new) {
			printk(KERN_ERR "PCI: Error updating region "
			       "%s/%d (high %08x != %08x)\n",
			       pci_name(dev), resno, new, check);
		}
	}
	res->flags &= ~IORESOURCE_UNSET;
	pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
		pci_name(dev), resno, res->flags,
		new & ~PCI_REGION_FLAG_MASK);
}

int pci_claim_resource(struct pci_dev *dev, int resource)
{
	struct resource *res = &dev->resource[resource];
	struct resource *root = NULL;
	char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
	int err;

	root = pcibios_select_root(dev, res);

	err = -EINVAL;
	if (root != NULL)
		err = insert_resource(root, res);

	if (err) {
		printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n",
			root ? "Address space collision on" :
				"No parent found for",
			resource, dtype, pci_name(dev),
			(unsigned long long)res->start,
			(unsigned long long)res->end);
	}

	return err;
}

int pci_assign_resource(struct pci_dev *dev, int resno)
{
	struct pci_bus *bus = dev->bus;
	struct resource *res = dev->resource + resno;
	resource_size_t size, min, align;
	int ret;

	size = res->end - res->start + 1;
	min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;

	align = resource_alignment(res);
	if (!align) {
		printk(KERN_ERR "PCI: Cannot allocate resource (bogus "
			"alignment) %d [%llx:%llx] (flags %lx) of %s\n",
			resno, (unsigned long long)res->start,
			(unsigned long long)res->end, res->flags,
			pci_name(dev));
		return -EINVAL;
	}

	/* First, try exact prefetching match.. */
	ret = pci_bus_alloc_resource(bus, res, size, align, min,
				     IORESOURCE_PREFETCH,
				     pcibios_align_resource, dev);

	if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
		/*
		 * That failed.
		 *
		 * But a prefetching area can handle a non-prefetching
		 * window (it will just not perform as well).
		 */
		ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
					     pcibios_align_resource, dev);
	}

	if (ret) {
		printk(KERN_ERR "PCI: Failed to allocate %s resource "
			"#%d:%llx@%llx for %s\n",
			res->flags & IORESOURCE_IO ? "I/O" : "mem",
			resno, (unsigned long long)size,
			(unsigned long long)res->start, pci_name(dev));
	} else {
		res->flags &= ~IORESOURCE_STARTALIGN;
		if (resno < PCI_BRIDGE_RESOURCES)
			pci_update_resource(dev, res, resno);
	}

	return ret;
}

#if 0
int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
{
	struct pci_bus *bus = dev->bus;
	struct resource *res = dev->resource + resno;
	unsigned int type_mask;
	int i, ret = -EBUSY;

	type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;

	for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
		struct resource *r = bus->resource[i];
		if (!r)
			continue;

		/* type_mask must match */
		if ((res->flags ^ r->flags) & type_mask)
			continue;

		ret = request_resource(r, res);

		if (ret == 0)
			break;
	}

	if (ret) {
		printk(KERN_ERR "PCI: Failed to allocate %s resource "
				"#%d:%llx@%llx for %s\n",
			res->flags & IORESOURCE_IO ? "I/O" : "mem",
			resno, (unsigned long long)(res->end - res->start + 1),
			(unsigned long long)res->start, pci_name(dev));
	} else if (resno < PCI_BRIDGE_RESOURCES) {
		pci_update_resource(dev, res, resno);
	}

	return ret;
}
EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
#endif

/* Sort resources by alignment */
void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
{
	int i;

	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
		struct resource *r;
		struct resource_list *list, *tmp;
		resource_size_t r_align;

		r = &dev->resource[i];

		if (r->flags & IORESOURCE_PCI_FIXED)
			continue;

		if (!(r->flags) || r->parent)
			continue;

		r_align = resource_alignment(r);
		if (!r_align) {
			printk(KERN_WARNING "PCI: bogus alignment of resource "
				"%d [%llx:%llx] (flags %lx) of %s\n",
				i, (unsigned long long)r->start,
				(unsigned long long)r->end, r->flags,
				pci_name(dev));
			continue;
		}
		for (list = head; ; list = list->next) {
			resource_size_t align = 0;
			struct resource_list *ln = list->next;

			if (ln)
				align = resource_alignment(ln->res);

			if (r_align > align) {
				tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
				if (!tmp)
					panic("pdev_sort_resources(): "
					      "kmalloc() failed!\n");
				tmp->next = ln;
				tmp->res = r;
				tmp->dev = dev;
				list->next = tmp;
				break;
			}
		}
	}
}

int pci_enable_resources(struct pci_dev *dev, int mask)
{
	u16 cmd, old_cmd;
	int i;
	struct resource *r;

	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	old_cmd = cmd;

	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
		if (!(mask & (1 << i)))
			continue;

		r = &dev->resource[i];

		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
			continue;
		if ((i == PCI_ROM_RESOURCE) &&
				(!(r->flags & IORESOURCE_ROM_ENABLE)))
			continue;

		if (!r->parent) {
			dev_err(&dev->dev, "device not available because of "
				"BAR %d [%llx:%llx] collisions\n", i,
				(unsigned long long) r->start,
				(unsigned long long) r->end);
			return -EINVAL;
		}

		if (r->flags & IORESOURCE_IO)
			cmd |= PCI_COMMAND_IO;
		if (r->flags & IORESOURCE_MEM)
			cmd |= PCI_COMMAND_MEMORY;
	}

	if (cmd != old_cmd) {
		dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
			 old_cmd, cmd);
		pci_write_config_word(dev, PCI_COMMAND, cmd);
	}
	return 0;
}
Commit	Line	Data
1da177e4 LT	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 <linux/init.h>
	20	#include <linux/kernel.h>
	21	#include <linux/pci.h>
	22	#include <linux/errno.h>
	23	#include <linux/ioport.h>
	24	#include <linux/cache.h>
	25	#include <linux/slab.h>
	26	#include "pci.h"
	27
	28
064b53db	29	void
1da177e4 LT	30	pci_update_resource(struct pci_dev dev, struct resource res, int resno)
	31	{
	32	struct pci_bus_region region;
	33	u32 new, check, mask;
	34	int reg;
	35
fb0f2b40 RB	36	/*
	37	* Ignore resources for unimplemented BARs and unused resource slots
	38	* for 64 bit BARs.
	39	*/
cf7bee5a IK	40	if (!res->flags)
	41	return;
	42
fb0f2b40 RB	43	/*
	44	* Ignore non-moveable resources. This might be legacy resources for
	45	* which no functional BAR register exists or another important
	46	* system resource we should better not move around in system address
	47	* space.
	48	*/
	49	if (res->flags & IORESOURCE_PCI_FIXED)
	50	return;
	51
1da177e4 LT	52	pcibios_resource_to_bus(dev, &region, res);
1da177e4 LT	53
6015fbef	54	pr_debug(" got res [%llx:%llx] bus [%llx:%llx] flags %lx for "
1396a8c3 GKH	55	"BAR %d of %s\n", (unsigned long long)res->start,
1396a8c3 GKH	56	(unsigned long long)res->end,
6015fbef BH	57	(unsigned long long)region.start,
	58	(unsigned long long)region.end,
	59	(unsigned long)res->flags, resno, pci_name(dev));
1da177e4 LT	60
	61	new = region.start \| (res->flags & PCI_REGION_FLAG_MASK);
	62	if (res->flags & IORESOURCE_IO)
	63	mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
	64	else
	65	mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
	66
	67	if (resno < 6) {
	68	reg = PCI_BASE_ADDRESS_0 + 4 * resno;
	69	} else if (resno == PCI_ROM_RESOURCE) {
755528c8 LT	70	if (!(res->flags & IORESOURCE_ROM_ENABLE))
	71	return;
	72	new \|= PCI_ROM_ADDRESS_ENABLE;
1da177e4 LT	73	reg = dev->rom_base_reg;
	74	} else {
	75	/* Hmm, non-standard resource. */
	76
	77	return; /* kill uninitialised var warning */
	78	}
	79
	80	pci_write_config_dword(dev, reg, new);
	81	pci_read_config_dword(dev, reg, &check);
	82
	83	if ((new ^ check) & mask) {
	84	printk(KERN_ERR "PCI: Error while updating region "
	85	"%s/%d (%08x != %08x)\n", pci_name(dev), resno,
	86	new, check);
	87	}
	88
	89	if ((new & (PCI_BASE_ADDRESS_SPACE\|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
	90	(PCI_BASE_ADDRESS_SPACE_MEMORY\|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
cf7bee5a	91	new = region.start >> 16 >> 16;
1da177e4 LT	92	pci_write_config_dword(dev, reg + 4, new);
	93	pci_read_config_dword(dev, reg + 4, &check);
	94	if (check != new) {
	95	printk(KERN_ERR "PCI: Error updating region "
	96	"%s/%d (high %08x != %08x)\n",
	97	pci_name(dev), resno, new, check);
	98	}
	99	}
	100	res->flags &= ~IORESOURCE_UNSET;
	101	pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
	102	pci_name(dev), resno, res->flags,
	103	new & ~PCI_REGION_FLAG_MASK);
	104	}
	105
96bde06a	106	int pci_claim_resource(struct pci_dev *dev, int resource)
1da177e4 LT	107	{
	108	struct resource *res = &dev->resource[resource];
	109	struct resource *root = NULL;
	110	char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
	111	int err;
	112
085ae41f	113	root = pcibios_select_root(dev, res);
1da177e4 LT	114
	115	err = -EINVAL;
	116	if (root != NULL)
	117	err = insert_resource(root, res);
	118
	119	if (err) {
1396a8c3 GKH	120	printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n",
	121	root ? "Address space collision on" :
	122	"No parent found for",
	123	resource, dtype, pci_name(dev),
	124	(unsigned long long)res->start,
	125	(unsigned long long)res->end);
1da177e4 LT	126	}
	127
	128	return err;
	129	}
	130
	131	int pci_assign_resource(struct pci_dev *dev, int resno)
	132	{
	133	struct pci_bus *bus = dev->bus;
	134	struct resource *res = dev->resource + resno;
e31dd6e4	135	resource_size_t size, min, align;
1da177e4 LT	136	int ret;
	137
	138	size = res->end - res->start + 1;
	139	min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
88452565 IK	140
	141	align = resource_alignment(res);
	142	if (!align) {
	143	printk(KERN_ERR "PCI: Cannot allocate resource (bogus "
	144	"alignment) %d [%llx:%llx] (flags %lx) of %s\n",
	145	resno, (unsigned long long)res->start,
	146	(unsigned long long)res->end, res->flags,
	147	pci_name(dev));
	148	return -EINVAL;
	149	}
1da177e4 LT	150
	151	/* First, try exact prefetching match.. */
	152	ret = pci_bus_alloc_resource(bus, res, size, align, min,
	153	IORESOURCE_PREFETCH,
	154	pcibios_align_resource, dev);
	155
	156	if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
	157	/*
	158	* That failed.
	159	*
	160	* But a prefetching area can handle a non-prefetching
	161	* window (it will just not perform as well).
	162	*/
	163	ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
	164	pcibios_align_resource, dev);
	165	}
	166
	167	if (ret) {
1396a8c3 GKH	168	printk(KERN_ERR "PCI: Failed to allocate %s resource "
	169	"#%d:%llx@%llx for %s\n",
	170	res->flags & IORESOURCE_IO ? "I/O" : "mem",
	171	resno, (unsigned long long)size,
	172	(unsigned long long)res->start, pci_name(dev));
88452565 IK	173	} else {
	174	res->flags &= ~IORESOURCE_STARTALIGN;
	175	if (resno < PCI_BRIDGE_RESOURCES)
	176	pci_update_resource(dev, res, resno);
1da177e4 LT	177	}
	178
	179	return ret;
	180	}
	181
2baad5f9	182	#if 0
75acfeca KG	183	int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
	184	{
	185	struct pci_bus *bus = dev->bus;
	186	struct resource *res = dev->resource + resno;
	187	unsigned int type_mask;
	188	int i, ret = -EBUSY;
	189
	190	type_mask = IORESOURCE_IO \| IORESOURCE_MEM \| IORESOURCE_PREFETCH;
	191
	192	for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
	193	struct resource *r = bus->resource[i];
	194	if (!r)
	195	continue;
	196
	197	/* type_mask must match */
	198	if ((res->flags ^ r->flags) & type_mask)
	199	continue;
	200
	201	ret = request_resource(r, res);
	202
	203	if (ret == 0)
	204	break;
	205	}
	206
	207	if (ret) {
	208	printk(KERN_ERR "PCI: Failed to allocate %s resource "
	209	"#%d:%llx@%llx for %s\n",
	210	res->flags & IORESOURCE_IO ? "I/O" : "mem",
	211	resno, (unsigned long long)(res->end - res->start + 1),
	212	(unsigned long long)res->start, pci_name(dev));
	213	} else if (resno < PCI_BRIDGE_RESOURCES) {
	214	pci_update_resource(dev, res, resno);
	215	}
	216
	217	return ret;
	218	}
	219	EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
	220	#endif
	221
1da177e4	222	/* Sort resources by alignment */
96bde06a	223	void pdev_sort_resources(struct pci_dev dev, struct resource_list head)
1da177e4 LT	224	{
	225	int i;
	226
	227	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	228	struct resource *r;
	229	struct resource_list list, tmp;
e31dd6e4	230	resource_size_t r_align;
1da177e4 LT	231
1da177e4 LT	232	r = &dev->resource[i];
fb0f2b40 RB	233
	234	if (r->flags & IORESOURCE_PCI_FIXED)
	235	continue;
	236
1da177e4 LT	237	if (!(r->flags) \|\| r->parent)
1da177e4 LT	238	continue;
88452565 IK	239
88452565 IK	240	r_align = resource_alignment(r);
1da177e4	241	if (!r_align) {
88452565 IK	242	printk(KERN_WARNING "PCI: bogus alignment of resource "
88452565 IK	243	"%d [%llx:%llx] (flags %lx) of %s\n",
1396a8c3	244	i, (unsigned long long)r->start,
88452565 IK	245	(unsigned long long)r->end, r->flags,
88452565 IK	246	pci_name(dev));
1da177e4 LT	247	continue;
1da177e4 LT	248	}
1da177e4	249	for (list = head; ; list = list->next) {
e31dd6e4	250	resource_size_t align = 0;
1da177e4	251	struct resource_list *ln = list->next;
88452565 IK	252
	253	if (ln)
	254	align = resource_alignment(ln->res);
	255
1da177e4 LT	256	if (r_align > align) {
	257	tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
	258	if (!tmp)
	259	panic("pdev_sort_resources(): "
	260	"kmalloc() failed!\n");
	261	tmp->next = ln;
	262	tmp->res = r;
	263	tmp->dev = dev;
	264	list->next = tmp;
	265	break;
	266	}
	267	}
	268	}
	269	}
842de40d BH	270
	271	int pci_enable_resources(struct pci_dev *dev, int mask)
	272	{
	273	u16 cmd, old_cmd;
	274	int i;
	275	struct resource *r;
	276
	277	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	278	old_cmd = cmd;
	279
	280	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	281	if (!(mask & (1 << i)))
	282	continue;
	283
	284	r = &dev->resource[i];
	285
	286	if (!(r->flags & (IORESOURCE_IO \| IORESOURCE_MEM)))
	287	continue;
	288	if ((i == PCI_ROM_RESOURCE) &&
	289	(!(r->flags & IORESOURCE_ROM_ENABLE)))
	290	continue;
	291
	292	if (!r->parent) {
	293	dev_err(&dev->dev, "device not available because of "
	294	"BAR %d [%llx:%llx] collisions\n", i,
	295	(unsigned long long) r->start,
	296	(unsigned long long) r->end);
	297	return -EINVAL;
	298	}
	299
	300	if (r->flags & IORESOURCE_IO)
	301	cmd \|= PCI_COMMAND_IO;
	302	if (r->flags & IORESOURCE_MEM)
	303	cmd \|= PCI_COMMAND_MEMORY;
	304	}
	305
	306	if (cmd != old_cmd) {
	307	dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
	308	old_cmd, cmd);
	309	pci_write_config_word(dev, PCI_COMMAND, cmd);
	310	}
	311	return 0;
	312	}