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

/*
 *	drivers/pci/setup-res.c
 *
 * Extruded from code written by
 *      Dave Rusling ([email protected])
 *      David Mosberger ([email protected])
 *	David Miller ([email protected])
 *
 * Support routines for initializing a PCI subsystem.
 */

/* fixed for multiple pci buses, 1999 Andrea Arcangeli <[email protected]> */

/*
 * Nov 2000, Ivan Kokshaysky <[email protected]>
 *	     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 [%lx:%lx] flags %lx for "
		 "BAR %d of %s\n", (unsigned long long)res->start,
		 (unsigned long long)res->end,
		 region.start, region.end, 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 __devinit
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;
}
EXPORT_SYMBOL_GPL(pci_claim_resource);

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;
	/* The bridge resources are special, as their
	   size != alignment. Sizing routines return
	   required alignment in the "start" field. */
	align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;

	/* 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 if (resno < PCI_BRIDGE_RESOURCES) {
		pci_update_resource(dev, res, resno);
	}

	return ret;
}

#ifdef CONFIG_EMBEDDED
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 __devinit
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;

		r_align = r->end - r->start;
		
		if (!(r->flags) || r->parent)
			continue;
		if (!r_align) {
			printk(KERN_WARNING "PCI: Ignore bogus resource %d "
				"[%llx:%llx] of %s\n",
				i, (unsigned long long)r->start,
				(unsigned long long)r->end, pci_name(dev));
			continue;
		}
		r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
		for (list = head; ; list = list->next) {
			resource_size_t align = 0;
			struct resource_list *ln = list->next;
			int idx;

			if (ln) {
				idx = ln->res - &ln->dev->resource[0];
				align = (idx < PCI_BRIDGE_RESOURCES) ?
					ln->res->end - ln->res->start + 1 :
					ln->res->start;
			}
			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;
			}
		}
	}
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/pci/setup-res.c
	3	*
	4	* Extruded from code written by
	5	* Dave Rusling ([email protected])
	6	* David Mosberger ([email protected])
	7	* David Miller ([email protected])
	8	*
	9	* Support routines for initializing a PCI subsystem.
	10	*/
	11
	12	/* fixed for multiple pci buses, 1999 Andrea Arcangeli <[email protected]> */
	13
	14	/*
	15	* Nov 2000, Ivan Kokshaysky <[email protected]>
	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
1396a8c3 GKH	54	pr_debug(" got res [%llx:%llx] bus [%lx:%lx] flags %lx for "
	55	"BAR %d of %s\n", (unsigned long long)res->start,
	56	(unsigned long long)res->end,
1da177e4 LT	57	region.start, region.end, res->flags, resno, pci_name(dev));
	58
	59	new = region.start \| (res->flags & PCI_REGION_FLAG_MASK);
	60	if (res->flags & IORESOURCE_IO)
	61	mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
	62	else
	63	mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
	64
	65	if (resno < 6) {
	66	reg = PCI_BASE_ADDRESS_0 + 4 * resno;
	67	} else if (resno == PCI_ROM_RESOURCE) {
755528c8 LT	68	if (!(res->flags & IORESOURCE_ROM_ENABLE))
	69	return;
	70	new \|= PCI_ROM_ADDRESS_ENABLE;
1da177e4 LT	71	reg = dev->rom_base_reg;
	72	} else {
	73	/* Hmm, non-standard resource. */
	74
	75	return; /* kill uninitialised var warning */
	76	}
	77
	78	pci_write_config_dword(dev, reg, new);
	79	pci_read_config_dword(dev, reg, &check);
	80
	81	if ((new ^ check) & mask) {
	82	printk(KERN_ERR "PCI: Error while updating region "
	83	"%s/%d (%08x != %08x)\n", pci_name(dev), resno,
	84	new, check);
	85	}
	86
	87	if ((new & (PCI_BASE_ADDRESS_SPACE\|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
	88	(PCI_BASE_ADDRESS_SPACE_MEMORY\|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
cf7bee5a	89	new = region.start >> 16 >> 16;
1da177e4 LT	90	pci_write_config_dword(dev, reg + 4, new);
	91	pci_read_config_dword(dev, reg + 4, &check);
	92	if (check != new) {
	93	printk(KERN_ERR "PCI: Error updating region "
	94	"%s/%d (high %08x != %08x)\n",
	95	pci_name(dev), resno, new, check);
	96	}
	97	}
	98	res->flags &= ~IORESOURCE_UNSET;
	99	pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
	100	pci_name(dev), resno, res->flags,
	101	new & ~PCI_REGION_FLAG_MASK);
	102	}
	103
	104	int __devinit
	105	pci_claim_resource(struct pci_dev *dev, int resource)
	106	{
	107	struct resource *res = &dev->resource[resource];
	108	struct resource *root = NULL;
	109	char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
	110	int err;
	111
085ae41f	112	root = pcibios_select_root(dev, res);
1da177e4 LT	113
	114	err = -EINVAL;
	115	if (root != NULL)
	116	err = insert_resource(root, res);
	117
	118	if (err) {
1396a8c3 GKH	119	printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n",
	120	root ? "Address space collision on" :
	121	"No parent found for",
	122	resource, dtype, pci_name(dev),
	123	(unsigned long long)res->start,
	124	(unsigned long long)res->end);
1da177e4 LT	125	}
	126
	127	return err;
	128	}
dd8c4996	129	EXPORT_SYMBOL_GPL(pci_claim_resource);
1da177e4 LT	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;
	140	/* The bridge resources are special, as their
	141	size != alignment. Sizing routines return
	142	required alignment in the "start" field. */
	143	align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
	144
	145	/* First, try exact prefetching match.. */
	146	ret = pci_bus_alloc_resource(bus, res, size, align, min,
	147	IORESOURCE_PREFETCH,
	148	pcibios_align_resource, dev);
	149
	150	if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
	151	/*
	152	* That failed.
	153	*
	154	* But a prefetching area can handle a non-prefetching
	155	* window (it will just not perform as well).
	156	*/
	157	ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
	158	pcibios_align_resource, dev);
	159	}
	160
	161	if (ret) {
1396a8c3 GKH	162	printk(KERN_ERR "PCI: Failed to allocate %s resource "
	163	"#%d:%llx@%llx for %s\n",
	164	res->flags & IORESOURCE_IO ? "I/O" : "mem",
	165	resno, (unsigned long long)size,
	166	(unsigned long long)res->start, pci_name(dev));
1da177e4 LT	167	} else if (resno < PCI_BRIDGE_RESOURCES) {
	168	pci_update_resource(dev, res, resno);
	169	}
	170
	171	return ret;
	172	}
	173
75acfeca KG	174	#ifdef CONFIG_EMBEDDED
	175	int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
	176	{
	177	struct pci_bus *bus = dev->bus;
	178	struct resource *res = dev->resource + resno;
	179	unsigned int type_mask;
	180	int i, ret = -EBUSY;
	181
	182	type_mask = IORESOURCE_IO \| IORESOURCE_MEM \| IORESOURCE_PREFETCH;
	183
	184	for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
	185	struct resource *r = bus->resource[i];
	186	if (!r)
	187	continue;
	188
	189	/* type_mask must match */
	190	if ((res->flags ^ r->flags) & type_mask)
	191	continue;
	192
	193	ret = request_resource(r, res);
	194
	195	if (ret == 0)
	196	break;
	197	}
	198
	199	if (ret) {
	200	printk(KERN_ERR "PCI: Failed to allocate %s resource "
	201	"#%d:%llx@%llx for %s\n",
	202	res->flags & IORESOURCE_IO ? "I/O" : "mem",
	203	resno, (unsigned long long)(res->end - res->start + 1),
	204	(unsigned long long)res->start, pci_name(dev));
	205	} else if (resno < PCI_BRIDGE_RESOURCES) {
	206	pci_update_resource(dev, res, resno);
	207	}
	208
	209	return ret;
	210	}
	211	EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
	212	#endif
	213
1da177e4 LT	214	/* Sort resources by alignment */
	215	void __devinit
	216	pdev_sort_resources(struct pci_dev dev, struct resource_list head)
	217	{
	218	int i;
	219
	220	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
	221	struct resource *r;
	222	struct resource_list list, tmp;
e31dd6e4	223	resource_size_t r_align;
1da177e4 LT	224
1da177e4 LT	225	r = &dev->resource[i];
fb0f2b40 RB	226
	227	if (r->flags & IORESOURCE_PCI_FIXED)
	228	continue;
	229
1da177e4 LT	230	r_align = r->end - r->start;
	231
	232	if (!(r->flags) \|\| r->parent)
	233	continue;
	234	if (!r_align) {
	235	printk(KERN_WARNING "PCI: Ignore bogus resource %d "
1396a8c3 GKH	236	"[%llx:%llx] of %s\n",
	237	i, (unsigned long long)r->start,
	238	(unsigned long long)r->end, pci_name(dev));
1da177e4 LT	239	continue;
	240	}
	241	r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
	242	for (list = head; ; list = list->next) {
e31dd6e4	243	resource_size_t align = 0;
1da177e4 LT	244	struct resource_list *ln = list->next;
	245	int idx;
	246
	247	if (ln) {
	248	idx = ln->res - &ln->dev->resource[0];
	249	align = (idx < PCI_BRIDGE_RESOURCES) ?
	250	ln->res->end - ln->res->start + 1 :
	251	ln->res->start;
	252	}
	253	if (r_align > align) {
	254	tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
	255	if (!tmp)
	256	panic("pdev_sort_resources(): "
	257	"kmalloc() failed!\n");
	258	tmp->next = ln;
	259	tmp->res = r;
	260	tmp->dev = dev;
	261	list->next = tmp;
	262	break;
	263	}
	264	}
	265	}
	266	}