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11#include <linux/bug.h>
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/bootmem.h>
15#include <linux/export.h>
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/pci.h>
19#include <linux/of_address.h>
20
21#include <asm/cpu-info.h>
22
23
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29
30
31
32static struct pci_controller *hose_head, **hose_tail = &hose_head;
33
34unsigned long PCIBIOS_MIN_IO;
35unsigned long PCIBIOS_MIN_MEM;
36
37static int pci_initialized;
38
39
40
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50
51
52resource_size_t
53pcibios_align_resource(void *data, const struct resource *res,
54 resource_size_t size, resource_size_t align)
55{
56 struct pci_dev *dev = data;
57 struct pci_controller *hose = dev->sysdata;
58 resource_size_t start = res->start;
59
60 if (res->flags & IORESOURCE_IO) {
61
62 if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
63 start = PCIBIOS_MIN_IO + hose->io_resource->start;
64
65
66
67
68 if (start & 0x300)
69 start = (start + 0x3ff) & ~0x3ff;
70 } else if (res->flags & IORESOURCE_MEM) {
71
72 if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
73 start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
74 }
75
76 return start;
77}
78
79static void pcibios_scanbus(struct pci_controller *hose)
80{
81 static int next_busno;
82 static int need_domain_info;
83 LIST_HEAD(resources);
84 struct pci_bus *bus;
85
86 if (!hose->iommu)
87 PCI_DMA_BUS_IS_PHYS = 1;
88
89 if (hose->get_busno && pci_has_flag(PCI_PROBE_ONLY))
90 next_busno = (*hose->get_busno)();
91
92 pci_add_resource_offset(&resources,
93 hose->mem_resource, hose->mem_offset);
94 pci_add_resource_offset(&resources, hose->io_resource, hose->io_offset);
95 bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
96 &resources);
97 if (!bus)
98 pci_free_resource_list(&resources);
99
100 hose->bus = bus;
101
102 need_domain_info = need_domain_info || hose->index;
103 hose->need_domain_info = need_domain_info;
104 if (bus) {
105 next_busno = bus->busn_res.end + 1;
106
107
108 if (next_busno > 224) {
109 next_busno = 0;
110 need_domain_info = 1;
111 }
112
113 if (!pci_has_flag(PCI_PROBE_ONLY)) {
114 pci_bus_size_bridges(bus);
115 pci_bus_assign_resources(bus);
116 }
117 }
118}
119
120#ifdef CONFIG_OF
121void pci_load_of_ranges(struct pci_controller *hose, struct device_node *node)
122{
123 const __be32 *ranges;
124 int rlen;
125 int pna = of_n_addr_cells(node);
126 int np = pna + 5;
127
128 pr_info("PCI host bridge %s ranges:\n", node->full_name);
129 ranges = of_get_property(node, "ranges", &rlen);
130 if (ranges == NULL)
131 return;
132 hose->of_node = node;
133
134 while ((rlen -= np * 4) >= 0) {
135 u32 pci_space;
136 struct resource *res = NULL;
137 u64 addr, size;
138
139 pci_space = be32_to_cpup(&ranges[0]);
140 addr = of_translate_address(node, ranges + 3);
141 size = of_read_number(ranges + pna + 3, 2);
142 ranges += np;
143 switch ((pci_space >> 24) & 0x3) {
144 case 1:
145 pr_info(" IO 0x%016llx..0x%016llx\n",
146 addr, addr + size - 1);
147 hose->io_map_base =
148 (unsigned long)ioremap(addr, size);
149 res = hose->io_resource;
150 res->flags = IORESOURCE_IO;
151 break;
152 case 2:
153 case 3:
154 pr_info(" MEM 0x%016llx..0x%016llx\n",
155 addr, addr + size - 1);
156 res = hose->mem_resource;
157 res->flags = IORESOURCE_MEM;
158 break;
159 }
160 if (res != NULL) {
161 res->start = addr;
162 res->name = node->full_name;
163 res->end = res->start + size - 1;
164 res->parent = NULL;
165 res->sibling = NULL;
166 res->child = NULL;
167 }
168 }
169}
170
171struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
172{
173 struct pci_controller *hose = bus->sysdata;
174
175 return of_node_get(hose->of_node);
176}
177#endif
178
179static DEFINE_MUTEX(pci_scan_mutex);
180
181void register_pci_controller(struct pci_controller *hose)
182{
183 struct resource *parent;
184
185 parent = hose->mem_resource->parent;
186 if (!parent)
187 parent = &iomem_resource;
188
189 if (request_resource(parent, hose->mem_resource) < 0)
190 goto out;
191
192 parent = hose->io_resource->parent;
193 if (!parent)
194 parent = &ioport_resource;
195
196 if (request_resource(parent, hose->io_resource) < 0) {
197 release_resource(hose->mem_resource);
198 goto out;
199 }
200
201 *hose_tail = hose;
202 hose_tail = &hose->next;
203
204
205
206
207 if (!hose->io_map_base) {
208 printk(KERN_WARNING
209 "registering PCI controller with io_map_base unset\n");
210 }
211
212
213
214
215
216 if (pci_initialized) {
217 mutex_lock(&pci_scan_mutex);
218 pcibios_scanbus(hose);
219 mutex_unlock(&pci_scan_mutex);
220 }
221
222 return;
223
224out:
225 printk(KERN_WARNING
226 "Skipping PCI bus scan due to resource conflict\n");
227}
228
229static void __init pcibios_set_cache_line_size(void)
230{
231 struct cpuinfo_mips *c = ¤t_cpu_data;
232 unsigned int lsize;
233
234
235
236
237
238 lsize = c->dcache.linesz;
239 lsize = c->scache.linesz ? : lsize;
240 lsize = c->tcache.linesz ? : lsize;
241
242 BUG_ON(!lsize);
243
244 pci_dfl_cache_line_size = lsize >> 2;
245
246 pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
247}
248
249static int __init pcibios_init(void)
250{
251 struct pci_controller *hose;
252
253 pcibios_set_cache_line_size();
254
255
256 for (hose = hose_head; hose; hose = hose->next)
257 pcibios_scanbus(hose);
258
259 pci_fixup_irqs(pci_common_swizzle, pcibios_map_irq);
260
261 pci_initialized = 1;
262
263 return 0;
264}
265
266subsys_initcall(pcibios_init);
267
268static int pcibios_enable_resources(struct pci_dev *dev, int mask)
269{
270 u16 cmd, old_cmd;
271 int idx;
272 struct resource *r;
273
274 pci_read_config_word(dev, PCI_COMMAND, &cmd);
275 old_cmd = cmd;
276 for (idx=0; idx < PCI_NUM_RESOURCES; idx++) {
277
278 if (!(mask & (1<<idx)))
279 continue;
280
281 r = &dev->resource[idx];
282 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
283 continue;
284 if ((idx == PCI_ROM_RESOURCE) &&
285 (!(r->flags & IORESOURCE_ROM_ENABLE)))
286 continue;
287 if (!r->start && r->end) {
288 printk(KERN_ERR "PCI: Device %s not available "
289 "because of resource collisions\n",
290 pci_name(dev));
291 return -EINVAL;
292 }
293 if (r->flags & IORESOURCE_IO)
294 cmd |= PCI_COMMAND_IO;
295 if (r->flags & IORESOURCE_MEM)
296 cmd |= PCI_COMMAND_MEMORY;
297 }
298 if (cmd != old_cmd) {
299 printk("PCI: Enabling device %s (%04x -> %04x)\n",
300 pci_name(dev), old_cmd, cmd);
301 pci_write_config_word(dev, PCI_COMMAND, cmd);
302 }
303 return 0;
304}
305
306unsigned int pcibios_assign_all_busses(void)
307{
308 return 1;
309}
310
311int pcibios_enable_device(struct pci_dev *dev, int mask)
312{
313 int err;
314
315 if ((err = pcibios_enable_resources(dev, mask)) < 0)
316 return err;
317
318 return pcibios_plat_dev_init(dev);
319}
320
321void pcibios_fixup_bus(struct pci_bus *bus)
322{
323 struct pci_dev *dev = bus->self;
324
325 if (pci_has_flag(PCI_PROBE_ONLY) && dev &&
326 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
327 pci_read_bridge_bases(bus);
328 }
329}
330
331EXPORT_SYMBOL(PCIBIOS_MIN_IO);
332EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
333
334int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
335 enum pci_mmap_state mmap_state, int write_combine)
336{
337 unsigned long prot;
338
339
340
341
342
343
344 if (mmap_state == pci_mmap_io)
345 return -EINVAL;
346
347
348
349
350 prot = pgprot_val(vma->vm_page_prot);
351 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
352 vma->vm_page_prot = __pgprot(prot);
353
354 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
355 vma->vm_end - vma->vm_start, vma->vm_page_prot);
356}
357
358char * (*pcibios_plat_setup)(char *str) __initdata;
359
360char *__init pcibios_setup(char *str)
361{
362 if (pcibios_plat_setup)
363 return pcibios_plat_setup(str);
364 return str;
365}
366