[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 shouldn't move around.
	 */
	if (res->flags & IORESOURCE_PCI_FIXED)
		return;

	pcibios_resource_to_bus(dev, &region, res);

	dev_dbg(&dev->dev, "BAR %d: got res %pR bus [%#llx-%#llx] "
		"flags %#lx\n", resno, res,
		 (unsigned long long)region.start,
		 (unsigned long long)region.end,
		 (unsigned long)res->flags);

	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) {
		dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
			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) {
			dev_err(&dev->dev, "BAR %d: error updating "
			       "(high %#08x != %#08x)\n", resno, new, check);
		}
	}
	res->flags &= ~IORESOURCE_UNSET;
	dev_dbg(&dev->dev, "BAR %d: moved to bus [%#llx-%#llx] flags %#lx\n",
		resno, (unsigned long long)region.start,
		(unsigned long long)region.end, res->flags);
}

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) {
		dev_err(&dev->dev, "BAR %d: %s of %s %pR\n",
			resource,
			root ? "address space collision on" :
				"no parent found for",
			dtype, res);
	}

	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 = resource_size(res);
	min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;

	align = resource_alignment(res);
	if (!align) {
		dev_info(&dev->dev, "BAR %d: can't allocate resource (bogus "
			"alignment) %pR flags %#lx\n",
			resno, res, res->flags);
		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) {
		dev_info(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
			resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
	} 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) {
		dev_err(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
			resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
	} 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) {
			dev_warn(&dev->dev, "BAR %d: bogus alignment "
				"%pR flags %#lx\n",
				i, r, r->flags);
			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 %pR collisions\n", i, r);
			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
80ccba11	29	void pci_update_resource(struct pci_dev dev, struct resource res, int resno)
1da177e4 LT	30	{
	31	struct pci_bus_region region;
	32	u32 new, check, mask;
	33	int reg;
	34
fb0f2b40 RB	35	/*
	36	* Ignore resources for unimplemented BARs and unused resource slots
	37	* for 64 bit BARs.
	38	*/
cf7bee5a IK	39	if (!res->flags)
	40	return;
	41
fb0f2b40 RB	42	/*
	43	* Ignore non-moveable resources. This might be legacy resources for
	44	* which no functional BAR register exists or another important
80ccba11	45	* system resource we shouldn't move around.
fb0f2b40 RB	46	*/
	47	if (res->flags & IORESOURCE_PCI_FIXED)
	48	return;
	49
1da177e4 LT	50	pcibios_resource_to_bus(dev, &region, res);
1da177e4 LT	51
096e6f67 BH	52	dev_dbg(&dev->dev, "BAR %d: got res %pR bus [%#llx-%#llx] "
096e6f67 BH	53	"flags %#lx\n", resno, res,
6015fbef BH	54	(unsigned long long)region.start,
6015fbef BH	55	(unsigned long long)region.end,
80ccba11	56	(unsigned long)res->flags);
1da177e4 LT	57
	58	new = region.start \| (res->flags & PCI_REGION_FLAG_MASK);
	59	if (res->flags & IORESOURCE_IO)
	60	mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
	61	else
	62	mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
	63
	64	if (resno < 6) {
	65	reg = PCI_BASE_ADDRESS_0 + 4 * resno;
	66	} else if (resno == PCI_ROM_RESOURCE) {
755528c8 LT	67	if (!(res->flags & IORESOURCE_ROM_ENABLE))
	68	return;
	69	new \|= PCI_ROM_ADDRESS_ENABLE;
1da177e4 LT	70	reg = dev->rom_base_reg;
	71	} else {
	72	/* Hmm, non-standard resource. */
	73
	74	return; /* kill uninitialised var warning */
	75	}
	76
	77	pci_write_config_dword(dev, reg, new);
	78	pci_read_config_dword(dev, reg, &check);
	79
	80	if ((new ^ check) & mask) {
80ccba11 BH	81	dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
80ccba11 BH	82	resno, new, check);
1da177e4 LT	83	}
	84
	85	if ((new & (PCI_BASE_ADDRESS_SPACE\|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
	86	(PCI_BASE_ADDRESS_SPACE_MEMORY\|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
cf7bee5a	87	new = region.start >> 16 >> 16;
1da177e4 LT	88	pci_write_config_dword(dev, reg + 4, new);
	89	pci_read_config_dword(dev, reg + 4, &check);
	90	if (check != new) {
80ccba11 BH	91	dev_err(&dev->dev, "BAR %d: error updating "
80ccba11 BH	92	"(high %#08x != %#08x)\n", resno, new, check);
1da177e4 LT	93	}
	94	}
	95	res->flags &= ~IORESOURCE_UNSET;
80ccba11 BH	96	dev_dbg(&dev->dev, "BAR %d: moved to bus [%#llx-%#llx] flags %#lx\n",
	97	resno, (unsigned long long)region.start,
	98	(unsigned long long)region.end, res->flags);
1da177e4 LT	99	}
1da177e4 LT	100
96bde06a	101	int pci_claim_resource(struct pci_dev *dev, int resource)
1da177e4 LT	102	{
	103	struct resource *res = &dev->resource[resource];
	104	struct resource *root = NULL;
	105	char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
	106	int err;
	107
085ae41f	108	root = pcibios_select_root(dev, res);
1da177e4 LT	109
	110	err = -EINVAL;
	111	if (root != NULL)
	112	err = insert_resource(root, res);
	113
	114	if (err) {
096e6f67	115	dev_err(&dev->dev, "BAR %d: %s of %s %pR\n",
80ccba11 BH	116	resource,
	117	root ? "address space collision on" :
	118	"no parent found for",
096e6f67	119	dtype, res);
1da177e4 LT	120	}
	121
	122	return err;
	123	}
	124
	125	int pci_assign_resource(struct pci_dev *dev, int resno)
	126	{
	127	struct pci_bus *bus = dev->bus;
	128	struct resource *res = dev->resource + resno;
e31dd6e4	129	resource_size_t size, min, align;
1da177e4 LT	130	int ret;
1da177e4 LT	131
022edd86	132	size = resource_size(res);
1da177e4	133	min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
88452565 IK	134
	135	align = resource_alignment(res);
	136	if (!align) {
104bafcf	137	dev_info(&dev->dev, "BAR %d: can't allocate resource (bogus "
096e6f67 BH	138	"alignment) %pR flags %#lx\n",
096e6f67 BH	139	resno, res, res->flags);
88452565 IK	140	return -EINVAL;
88452565 IK	141	}
1da177e4 LT	142
	143	/* First, try exact prefetching match.. */
	144	ret = pci_bus_alloc_resource(bus, res, size, align, min,
	145	IORESOURCE_PREFETCH,
	146	pcibios_align_resource, dev);
	147
	148	if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
	149	/*
	150	* That failed.
	151	*
	152	* But a prefetching area can handle a non-prefetching
	153	* window (it will just not perform as well).
	154	*/
	155	ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
	156	pcibios_align_resource, dev);
	157	}
	158
	159	if (ret) {
104bafcf	160	dev_info(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
096e6f67	161	resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
88452565 IK	162	} else {
	163	res->flags &= ~IORESOURCE_STARTALIGN;
	164	if (resno < PCI_BRIDGE_RESOURCES)
	165	pci_update_resource(dev, res, resno);
1da177e4 LT	166	}
	167
	168	return ret;
	169	}
	170
2baad5f9	171	#if 0
75acfeca KG	172	int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
	173	{
	174	struct pci_bus *bus = dev->bus;
	175	struct resource *res = dev->resource + resno;
	176	unsigned int type_mask;
	177	int i, ret = -EBUSY;
	178
	179	type_mask = IORESOURCE_IO \| IORESOURCE_MEM \| IORESOURCE_PREFETCH;
	180
	181	for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
	182	struct resource *r = bus->resource[i];
	183	if (!r)
	184	continue;
	185
	186	/* type_mask must match */
	187	if ((res->flags ^ r->flags) & type_mask)
	188	continue;
	189
	190	ret = request_resource(r, res);
	191
	192	if (ret == 0)
	193	break;
	194	}
	195
	196	if (ret) {
096e6f67 BH	197	dev_err(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
096e6f67 BH	198	resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
75acfeca KG	199	} else if (resno < PCI_BRIDGE_RESOURCES) {
	200	pci_update_resource(dev, res, resno);
	201	}
	202
	203	return ret;
	204	}
	205	EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
	206	#endif
	207
1da177e4	208	/* Sort resources by alignment */
96bde06a	209	void pdev_sort_resources(struct pci_dev dev, struct resource_list head)
1da177e4 LT	210	{
	211	int i;
	212
	213	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	214	struct resource *r;
	215	struct resource_list list, tmp;
e31dd6e4	216	resource_size_t r_align;
1da177e4 LT	217
1da177e4 LT	218	r = &dev->resource[i];
fb0f2b40 RB	219
	220	if (r->flags & IORESOURCE_PCI_FIXED)
	221	continue;
	222
1da177e4 LT	223	if (!(r->flags) \|\| r->parent)
1da177e4 LT	224	continue;
88452565 IK	225
88452565 IK	226	r_align = resource_alignment(r);
1da177e4	227	if (!r_align) {
80ccba11	228	dev_warn(&dev->dev, "BAR %d: bogus alignment "
096e6f67 BH	229	"%pR flags %#lx\n",
096e6f67 BH	230	i, r, r->flags);
1da177e4 LT	231	continue;
1da177e4 LT	232	}
1da177e4	233	for (list = head; ; list = list->next) {
e31dd6e4	234	resource_size_t align = 0;
1da177e4	235	struct resource_list *ln = list->next;
88452565 IK	236
	237	if (ln)
	238	align = resource_alignment(ln->res);
	239
1da177e4 LT	240	if (r_align > align) {
	241	tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
	242	if (!tmp)
	243	panic("pdev_sort_resources(): "
	244	"kmalloc() failed!\n");
	245	tmp->next = ln;
	246	tmp->res = r;
	247	tmp->dev = dev;
	248	list->next = tmp;
	249	break;
	250	}
	251	}
	252	}
	253	}
842de40d BH	254
	255	int pci_enable_resources(struct pci_dev *dev, int mask)
	256	{
	257	u16 cmd, old_cmd;
	258	int i;
	259	struct resource *r;
	260
	261	pci_read_config_word(dev, PCI_COMMAND, &cmd);
	262	old_cmd = cmd;
	263
	264	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	265	if (!(mask & (1 << i)))
	266	continue;
	267
	268	r = &dev->resource[i];
	269
	270	if (!(r->flags & (IORESOURCE_IO \| IORESOURCE_MEM)))
	271	continue;
	272	if ((i == PCI_ROM_RESOURCE) &&
	273	(!(r->flags & IORESOURCE_ROM_ENABLE)))
	274	continue;
	275
	276	if (!r->parent) {
	277	dev_err(&dev->dev, "device not available because of "
096e6f67	278	"BAR %d %pR collisions\n", i, r);
842de40d BH	279	return -EINVAL;
	280	}
	281
	282	if (r->flags & IORESOURCE_IO)
	283	cmd \|= PCI_COMMAND_IO;
	284	if (r->flags & IORESOURCE_MEM)
	285	cmd \|= PCI_COMMAND_MEMORY;
	286	}
	287
	288	if (cmd != old_cmd) {
	289	dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
	290	old_cmd, cmd);
	291	pci_write_config_word(dev, PCI_COMMAND, cmd);
	292	}
	293	return 0;
	294	}