setup-res.c revision c7dabef8a2c59e6a3de9d66fc35fb6a43ef7172d 
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
29void pci_update_resource(struct pci_dev *dev, int resno)
30{
31	struct pci_bus_region region;
32	u32 new, check, mask;
33	int reg;
34	enum pci_bar_type type;
35	struct resource *res = dev->resource + resno;
36
37	/*
38	 * Ignore resources for unimplemented BARs and unused resource slots
39	 * for 64 bit BARs.
40	 */
41	if (!res->flags)
42		return;
43
44	/*
45	 * Ignore non-moveable resources.  This might be legacy resources for
46	 * which no functional BAR register exists or another important
47	 * system resource we shouldn't move around.
48	 */
49	if (res->flags & IORESOURCE_PCI_FIXED)
50		return;
51
52	pcibios_resource_to_bus(dev, &region, res);
53
54	dev_dbg(&dev->dev, "BAR %d: got res %pR bus [%#llx-%#llx] "
55		"flags %#lx\n", resno, res,
56		 (unsigned long long)region.start,
57		 (unsigned long long)region.end,
58		 (unsigned long)res->flags);
59
60	new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
61	if (res->flags & IORESOURCE_IO)
62		mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
63	else
64		mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
65
66	reg = pci_resource_bar(dev, resno, &type);
67	if (!reg)
68		return;
69	if (type != pci_bar_unknown) {
70		if (!(res->flags & IORESOURCE_ROM_ENABLE))
71			return;
72		new |= PCI_ROM_ADDRESS_ENABLE;
73	}
74
75	pci_write_config_dword(dev, reg, new);
76	pci_read_config_dword(dev, reg, &check);
77
78	if ((new ^ check) & mask) {
79		dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
80			resno, new, check);
81	}
82
83	if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
84	    (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
85		new = region.start >> 16 >> 16;
86		pci_write_config_dword(dev, reg + 4, new);
87		pci_read_config_dword(dev, reg + 4, &check);
88		if (check != new) {
89			dev_err(&dev->dev, "BAR %d: error updating "
90			       "(high %#08x != %#08x)\n", resno, new, check);
91		}
92	}
93	res->flags &= ~IORESOURCE_UNSET;
94	dev_dbg(&dev->dev, "BAR %d: moved to %pR (bus addr [%#llx-%#llx])\n",
95		resno, res, (unsigned long long)region.start,
96		(unsigned long long)region.end);
97}
98
99int pci_claim_resource(struct pci_dev *dev, int resource)
100{
101	struct resource *res = &dev->resource[resource];
102	struct resource *root;
103	int err;
104
105	root = pci_find_parent_resource(dev, res);
106
107	err = -EINVAL;
108	if (root != NULL)
109		err = request_resource(root, res);
110
111	if (err) {
112		const char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
113		dev_err(&dev->dev, "BAR %d: %s of %s %pR\n",
114			resource,
115			root ? "address space collision on" :
116				"no parent found for",
117			dtype, res);
118	}
119
120	return err;
121}
122EXPORT_SYMBOL(pci_claim_resource);
123
124#ifdef CONFIG_PCI_QUIRKS
125void pci_disable_bridge_window(struct pci_dev *dev)
126{
127	dev_dbg(&dev->dev, "Disabling bridge window.\n");
128
129	/* MMIO Base/Limit */
130	pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
131
132	/* Prefetchable MMIO Base/Limit */
133	pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
134	pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
135	pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
136}
137#endif	/* CONFIG_PCI_QUIRKS */
138
139static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
140				 int resno)
141{
142	struct resource *res = dev->resource + resno;
143	resource_size_t size, min, align;
144	int ret;
145
146	size = resource_size(res);
147	min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
148	align = pci_resource_alignment(dev, res);
149
150	/* First, try exact prefetching match.. */
151	ret = pci_bus_alloc_resource(bus, res, size, align, min,
152				     IORESOURCE_PREFETCH,
153				     pcibios_align_resource, dev);
154
155	if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
156		/*
157		 * That failed.
158		 *
159		 * But a prefetching area can handle a non-prefetching
160		 * window (it will just not perform as well).
161		 */
162		ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
163					     pcibios_align_resource, dev);
164	}
165
166	if (!ret) {
167		res->flags &= ~IORESOURCE_STARTALIGN;
168		if (resno < PCI_BRIDGE_RESOURCES)
169			pci_update_resource(dev, resno);
170	}
171
172	return ret;
173}
174
175int pci_assign_resource(struct pci_dev *dev, int resno)
176{
177	struct resource *res = dev->resource + resno;
178	resource_size_t align;
179	struct pci_bus *bus;
180	int ret;
181
182	align = pci_resource_alignment(dev, res);
183	if (!align) {
184		dev_info(&dev->dev, "BAR %d: can't allocate %pR "
185			 "(bogus alignment)\n", resno, res);
186		return -EINVAL;
187	}
188
189	bus = dev->bus;
190	while ((ret = __pci_assign_resource(bus, dev, resno))) {
191		if (bus->parent && bus->self->transparent)
192			bus = bus->parent;
193		else
194			bus = NULL;
195		if (bus)
196			continue;
197		break;
198	}
199
200	if (ret)
201		dev_info(&dev->dev, "BAR %d: can't allocate %pR\n",
202			 resno, res);
203
204	return ret;
205}
206
207/* Sort resources by alignment */
208void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
209{
210	int i;
211
212	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
213		struct resource *r;
214		struct resource_list *list, *tmp;
215		resource_size_t r_align;
216
217		r = &dev->resource[i];
218
219		if (r->flags & IORESOURCE_PCI_FIXED)
220			continue;
221
222		if (!(r->flags) || r->parent)
223			continue;
224
225		r_align = pci_resource_alignment(dev, r);
226		if (!r_align) {
227			dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
228				 i, r);
229			continue;
230		}
231		for (list = head; ; list = list->next) {
232			resource_size_t align = 0;
233			struct resource_list *ln = list->next;
234
235			if (ln)
236				align = pci_resource_alignment(ln->dev, ln->res);
237
238			if (r_align > align) {
239				tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
240				if (!tmp)
241					panic("pdev_sort_resources(): "
242					      "kmalloc() failed!\n");
243				tmp->next = ln;
244				tmp->res = r;
245				tmp->dev = dev;
246				list->next = tmp;
247				break;
248			}
249		}
250	}
251}
252
253int pci_enable_resources(struct pci_dev *dev, int mask)
254{
255	u16 cmd, old_cmd;
256	int i;
257	struct resource *r;
258
259	pci_read_config_word(dev, PCI_COMMAND, &cmd);
260	old_cmd = cmd;
261
262	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
263		if (!(mask & (1 << i)))
264			continue;
265
266		r = &dev->resource[i];
267
268		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
269			continue;
270		if ((i == PCI_ROM_RESOURCE) &&
271				(!(r->flags & IORESOURCE_ROM_ENABLE)))
272			continue;
273
274		if (!r->parent) {
275			dev_err(&dev->dev, "device not available because of "
276				"BAR %d %pR collisions\n", i, r);
277			return -EINVAL;
278		}
279
280		if (r->flags & IORESOURCE_IO)
281			cmd |= PCI_COMMAND_IO;
282		if (r->flags & IORESOURCE_MEM)
283			cmd |= PCI_COMMAND_MEMORY;
284	}
285
286	if (cmd != old_cmd) {
287		dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
288			 old_cmd, cmd);
289		pci_write_config_word(dev, PCI_COMMAND, cmd);
290	}
291	return 0;
292}
293