blob: 8108231f2e20909ed0057a792a4f3265827fac8f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License as published by the
4 * Free Software Foundation; either version 2 of the License, or (at your
5 * option) any later version.
6 *
7 * Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org)
8 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/kernel.h>
10#include <linux/mm.h>
11#include <linux/bootmem.h>
12#include <linux/init.h>
13#include <linux/types.h>
14#include <linux/pci.h>
15
16/*
17 * Indicate whether we respect the PCI setup left by the firmware.
18 *
19 * Make this long-lived so that we know when shutting down
20 * whether we probed only or not.
21 */
22int pci_probe_only;
23
24#define PCI_ASSIGN_ALL_BUSSES 1
25
26unsigned int pci_probe = PCI_ASSIGN_ALL_BUSSES;
27
28/*
29 * The PCI controller list.
30 */
31
32struct pci_controller *hose_head, **hose_tail = &hose_head;
33struct pci_controller *pci_isa_hose;
34
35unsigned long PCIBIOS_MIN_IO = 0x0000;
36unsigned long PCIBIOS_MIN_MEM = 0;
37
38/*
39 * We need to avoid collisions with `mirrored' VGA ports
40 * and other strange ISA hardware, so we always want the
41 * addresses to be allocated in the 0x000-0x0ff region
42 * modulo 0x400.
43 *
44 * Why? Because some silly external IO cards only decode
45 * the low 10 bits of the IO address. The 0x00-0xff region
46 * is reserved for motherboard devices that decode all 16
47 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
48 * but we want to try to avoid allocating at 0x2900-0x2bff
49 * which might have be mirrored at 0x0100-0x03ff..
50 */
51void
52pcibios_align_resource(void *data, struct resource *res,
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -070053 resource_size_t size, resource_size_t align)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
55 struct pci_dev *dev = data;
56 struct pci_controller *hose = dev->sysdata;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -070057 resource_size_t start = res->start;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 if (res->flags & IORESOURCE_IO) {
60 /* Make sure we start at our min on all hoses */
61 if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
62 start = PCIBIOS_MIN_IO + hose->io_resource->start;
63
64 /*
65 * Put everything into 0x00-0xff region modulo 0x400
66 */
67 if (start & 0x300)
68 start = (start + 0x3ff) & ~0x3ff;
69 } else if (res->flags & IORESOURCE_MEM) {
70 /* Make sure we start at our min on all hoses */
71 if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
72 start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
73 }
74
75 res->start = start;
76}
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078void __init register_pci_controller(struct pci_controller *hose)
79{
Thomas Bogendoerfer639702b2007-04-08 13:28:44 +020080 if (request_resource(&iomem_resource, hose->mem_resource) < 0)
81 goto out;
82 if (request_resource(&ioport_resource, hose->io_resource) < 0) {
83 release_resource(hose->mem_resource);
84 goto out;
85 }
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 *hose_tail = hose;
88 hose_tail = &hose->next;
Ralf Baechle140c1722006-12-07 15:35:43 +010089
90 /*
91 * Do not panic here but later - this might hapen before console init.
92 */
93 if (!hose->io_map_base) {
94 printk(KERN_WARNING
95 "registering PCI controller with io_map_base unset\n");
96 }
Thomas Bogendoerfer639702b2007-04-08 13:28:44 +020097 return;
98
99out:
100 printk(KERN_WARNING
101 "Skipping PCI bus scan due to resource conflict\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102}
103
104/* Most MIPS systems have straight-forward swizzling needs. */
105
106static inline u8 bridge_swizzle(u8 pin, u8 slot)
107{
108 return (((pin - 1) + slot) % 4) + 1;
109}
110
111static u8 __init common_swizzle(struct pci_dev *dev, u8 *pinp)
112{
113 u8 pin = *pinp;
114
115 while (dev->bus->parent) {
116 pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
117 /* Move up the chain of bridges. */
118 dev = dev->bus->self;
119 }
120 *pinp = pin;
121
122 /* The slot is the slot of the last bridge. */
123 return PCI_SLOT(dev->devfn);
124}
125
126static int __init pcibios_init(void)
127{
128 struct pci_controller *hose;
129 struct pci_bus *bus;
130 int next_busno;
131 int need_domain_info = 0;
132
133 /* Scan all of the recorded PCI controllers. */
134 for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 if (!hose->iommu)
137 PCI_DMA_BUS_IS_PHYS = 1;
138
Andrew Isaacson8a1417d2005-10-19 23:59:11 -0700139 if (hose->get_busno && pci_probe_only)
140 next_busno = (*hose->get_busno)();
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
143 hose->bus = bus;
144 hose->need_domain_info = need_domain_info;
Andrew Isaacson8a1417d2005-10-19 23:59:11 -0700145 if (bus) {
146 next_busno = bus->subordinate + 1;
147 /* Don't allow 8-bit bus number overflow inside the hose -
148 reserve some space for bridges. */
149 if (next_busno > 224) {
150 next_busno = 0;
151 need_domain_info = 1;
152 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 }
155
156 if (!pci_probe_only)
157 pci_assign_unassigned_resources();
158 pci_fixup_irqs(common_swizzle, pcibios_map_irq);
159
160 return 0;
161}
162
163subsys_initcall(pcibios_init);
164
165static int pcibios_enable_resources(struct pci_dev *dev, int mask)
166{
167 u16 cmd, old_cmd;
168 int idx;
169 struct resource *r;
170
171 pci_read_config_word(dev, PCI_COMMAND, &cmd);
172 old_cmd = cmd;
Ralf Baechlee5de3b42005-07-12 09:18:53 +0000173 for (idx=0; idx < PCI_NUM_RESOURCES; idx++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 /* Only set up the requested stuff */
175 if (!(mask & (1<<idx)))
176 continue;
177
178 r = &dev->resource[idx];
179 if (!r->start && r->end) {
180 printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
181 return -EINVAL;
182 }
183 if (r->flags & IORESOURCE_IO)
184 cmd |= PCI_COMMAND_IO;
185 if (r->flags & IORESOURCE_MEM)
186 cmd |= PCI_COMMAND_MEMORY;
187 }
188 if (dev->resource[PCI_ROM_RESOURCE].start)
189 cmd |= PCI_COMMAND_MEMORY;
190 if (cmd != old_cmd) {
191 printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
192 pci_write_config_word(dev, PCI_COMMAND, cmd);
193 }
194 return 0;
195}
196
197/*
198 * If we set up a device for bus mastering, we need to check the latency
199 * timer as certain crappy BIOSes forget to set it properly.
200 */
201unsigned int pcibios_max_latency = 255;
202
203void pcibios_set_master(struct pci_dev *dev)
204{
205 u8 lat;
206 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
207 if (lat < 16)
208 lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
209 else if (lat > pcibios_max_latency)
210 lat = pcibios_max_latency;
211 else
212 return;
213 printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n",
214 pci_name(dev), lat);
215 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
216}
217
218unsigned int pcibios_assign_all_busses(void)
219{
220 return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
221}
222
223int pcibios_enable_device(struct pci_dev *dev, int mask)
224{
225 int err;
226
227 if ((err = pcibios_enable_resources(dev, mask)) < 0)
228 return err;
229
230 return pcibios_plat_dev_init(dev);
231}
232
Atsushi Nemoto44197082007-02-23 01:13:17 +0900233static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 struct pci_bus *bus)
235{
236 /* Update device resources. */
237 struct pci_controller *hose = (struct pci_controller *)bus->sysdata;
238 unsigned long offset = 0;
239 int i;
240
241 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
242 if (!dev->resource[i].start)
243 continue;
244 if (dev->resource[i].flags & IORESOURCE_IO)
245 offset = hose->io_offset;
246 else if (dev->resource[i].flags & IORESOURCE_MEM)
247 offset = hose->mem_offset;
248
249 dev->resource[i].start += offset;
250 dev->resource[i].end += offset;
251 }
252}
253
254void __devinit pcibios_fixup_bus(struct pci_bus *bus)
255{
256 /* Propagate hose info into the subordinate devices. */
257
258 struct pci_controller *hose = bus->sysdata;
259 struct list_head *ln;
260 struct pci_dev *dev = bus->self;
261
262 if (!dev) {
263 bus->resource[0] = hose->io_resource;
264 bus->resource[1] = hose->mem_resource;
265 } else if (pci_probe_only &&
266 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
267 pci_read_bridge_bases(bus);
268 pcibios_fixup_device_resources(dev, bus);
Ralf Baechle42a3b4f2005-09-03 15:56:17 -0700269 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
272 struct pci_dev *dev = pci_dev_b(ln);
273
274 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
275 pcibios_fixup_device_resources(dev, bus);
276 }
277}
278
279void __init
280pcibios_update_irq(struct pci_dev *dev, int irq)
281{
282 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
283}
284
285void __devinit
286pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
287 struct resource *res)
288{
289 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
290 unsigned long offset = 0;
291
292 if (res->flags & IORESOURCE_IO)
293 offset = hose->io_offset;
294 else if (res->flags & IORESOURCE_MEM)
295 offset = hose->mem_offset;
296
297 region->start = res->start - offset;
298 region->end = res->end - offset;
299}
300
Yoichi Yuasae63ea562005-09-03 15:56:20 -0700301void __devinit
302pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
303 struct pci_bus_region *region)
304{
305 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
306 unsigned long offset = 0;
307
308 if (res->flags & IORESOURCE_IO)
309 offset = hose->io_offset;
310 else if (res->flags & IORESOURCE_MEM)
311 offset = hose->mem_offset;
312
313 res->start = region->start + offset;
314 res->end = region->end + offset;
315}
316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317#ifdef CONFIG_HOTPLUG
318EXPORT_SYMBOL(pcibios_resource_to_bus);
Yoichi Yuasae63ea562005-09-03 15:56:20 -0700319EXPORT_SYMBOL(pcibios_bus_to_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320EXPORT_SYMBOL(PCIBIOS_MIN_IO);
321EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
322#endif
323
324char *pcibios_setup(char *str)
325{
326 return str;
327}