aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pci/setup-res.c
blob: 4be7ccf7e3ae9f4984b3ccae7563e23beb601d5b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
/*
 *	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;
	/* 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 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;
			}
		}
	}
}