Merge branch 'of-pci' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[linux-2.6.git] / arch / x86 / kernel / devicetree.c
1 /*
2  * Architecture specific OF callbacks.
3  */
4 #include <linux/bootmem.h>
5 #include <linux/io.h>
6 #include <linux/interrupt.h>
7 #include <linux/list.h>
8 #include <linux/of.h>
9 #include <linux/of_fdt.h>
10 #include <linux/of_address.h>
11 #include <linux/of_platform.h>
12 #include <linux/of_irq.h>
13 #include <linux/slab.h>
14 #include <linux/pci.h>
15 #include <linux/of_pci.h>
16 #include <linux/initrd.h>
17
18 #include <asm/hpet.h>
19 #include <asm/irq_controller.h>
20 #include <asm/apic.h>
21 #include <asm/pci_x86.h>
22
23 __initdata u64 initial_dtb;
24 char __initdata cmd_line[COMMAND_LINE_SIZE];
25 static LIST_HEAD(irq_domains);
26 static DEFINE_RAW_SPINLOCK(big_irq_lock);
27
28 int __initdata of_ioapic;
29
30 #ifdef CONFIG_X86_IO_APIC
31 static void add_interrupt_host(struct irq_domain *ih)
32 {
33         unsigned long flags;
34
35         raw_spin_lock_irqsave(&big_irq_lock, flags);
36         list_add(&ih->l, &irq_domains);
37         raw_spin_unlock_irqrestore(&big_irq_lock, flags);
38 }
39 #endif
40
41 static struct irq_domain *get_ih_from_node(struct device_node *controller)
42 {
43         struct irq_domain *ih, *found = NULL;
44         unsigned long flags;
45
46         raw_spin_lock_irqsave(&big_irq_lock, flags);
47         list_for_each_entry(ih, &irq_domains, l) {
48                 if (ih->controller ==  controller) {
49                         found = ih;
50                         break;
51                 }
52         }
53         raw_spin_unlock_irqrestore(&big_irq_lock, flags);
54         return found;
55 }
56
57 unsigned int irq_create_of_mapping(struct device_node *controller,
58                                    const u32 *intspec, unsigned int intsize)
59 {
60         struct irq_domain *ih;
61         u32 virq, type;
62         int ret;
63
64         ih = get_ih_from_node(controller);
65         if (!ih)
66                 return 0;
67         ret = ih->xlate(ih, intspec, intsize, &virq, &type);
68         if (ret)
69                 return 0;
70         if (type == IRQ_TYPE_NONE)
71                 return virq;
72         irq_set_irq_type(virq, type);
73         return virq;
74 }
75 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
76
77 unsigned long pci_address_to_pio(phys_addr_t address)
78 {
79         /*
80          * The ioport address can be directly used by inX / outX
81          */
82         BUG_ON(address >= (1 << 16));
83         return (unsigned long)address;
84 }
85 EXPORT_SYMBOL_GPL(pci_address_to_pio);
86
87 void __init early_init_dt_scan_chosen_arch(unsigned long node)
88 {
89         BUG();
90 }
91
92 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
93 {
94         BUG();
95 }
96
97 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
98 {
99         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
100 }
101
102 #ifdef CONFIG_BLK_DEV_INITRD
103 void __init early_init_dt_setup_initrd_arch(unsigned long start,
104                                             unsigned long end)
105 {
106         initrd_start = (unsigned long)__va(start);
107         initrd_end = (unsigned long)__va(end);
108         initrd_below_start_ok = 1;
109 }
110 #endif
111
112 void __init add_dtb(u64 data)
113 {
114         initial_dtb = data + offsetof(struct setup_data, data);
115 }
116
117 /*
118  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
119  */
120 static struct of_device_id __initdata ce4100_ids[] = {
121         { .compatible = "intel,ce4100-cp", },
122         { .compatible = "isa", },
123         { .compatible = "pci", },
124         {},
125 };
126
127 static int __init add_bus_probe(void)
128 {
129         if (!of_have_populated_dt())
130                 return 0;
131
132         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
133 }
134 module_init(add_bus_probe);
135
136 #ifdef CONFIG_PCI
137 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
138 {
139         struct device_node *np;
140
141         for_each_node_by_type(np, "pci") {
142                 const void *prop;
143                 unsigned int bus_min;
144
145                 prop = of_get_property(np, "bus-range", NULL);
146                 if (!prop)
147                         continue;
148                 bus_min = be32_to_cpup(prop);
149                 if (bus->number == bus_min)
150                         return np;
151         }
152         return NULL;
153 }
154
155 static int x86_of_pci_irq_enable(struct pci_dev *dev)
156 {
157         struct of_irq oirq;
158         u32 virq;
159         int ret;
160         u8 pin;
161
162         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
163         if (ret)
164                 return ret;
165         if (!pin)
166                 return 0;
167
168         ret = of_irq_map_pci(dev, &oirq);
169         if (ret)
170                 return ret;
171
172         virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
173                         oirq.size);
174         if (virq == 0)
175                 return -EINVAL;
176         dev->irq = virq;
177         return 0;
178 }
179
180 static void x86_of_pci_irq_disable(struct pci_dev *dev)
181 {
182 }
183
184 void __cpuinit x86_of_pci_init(void)
185 {
186         pcibios_enable_irq = x86_of_pci_irq_enable;
187         pcibios_disable_irq = x86_of_pci_irq_disable;
188 }
189 #endif
190
191 static void __init dtb_setup_hpet(void)
192 {
193 #ifdef CONFIG_HPET_TIMER
194         struct device_node *dn;
195         struct resource r;
196         int ret;
197
198         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
199         if (!dn)
200                 return;
201         ret = of_address_to_resource(dn, 0, &r);
202         if (ret) {
203                 WARN_ON(1);
204                 return;
205         }
206         hpet_address = r.start;
207 #endif
208 }
209
210 static void __init dtb_lapic_setup(void)
211 {
212 #ifdef CONFIG_X86_LOCAL_APIC
213         struct device_node *dn;
214         struct resource r;
215         int ret;
216
217         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
218         if (!dn)
219                 return;
220
221         ret = of_address_to_resource(dn, 0, &r);
222         if (WARN_ON(ret))
223                 return;
224
225         /* Did the boot loader setup the local APIC ? */
226         if (!cpu_has_apic) {
227                 if (apic_force_enable(r.start))
228                         return;
229         }
230         smp_found_config = 1;
231         pic_mode = 1;
232         register_lapic_address(r.start);
233         generic_processor_info(boot_cpu_physical_apicid,
234                                GET_APIC_VERSION(apic_read(APIC_LVR)));
235 #endif
236 }
237
238 #ifdef CONFIG_X86_IO_APIC
239 static unsigned int ioapic_id;
240
241 static void __init dtb_add_ioapic(struct device_node *dn)
242 {
243         struct resource r;
244         int ret;
245
246         ret = of_address_to_resource(dn, 0, &r);
247         if (ret) {
248                 printk(KERN_ERR "Can't obtain address from node %s.\n",
249                                 dn->full_name);
250                 return;
251         }
252         mp_register_ioapic(++ioapic_id, r.start, gsi_top);
253 }
254
255 static void __init dtb_ioapic_setup(void)
256 {
257         struct device_node *dn;
258
259         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
260                 dtb_add_ioapic(dn);
261
262         if (nr_ioapics) {
263                 of_ioapic = 1;
264                 return;
265         }
266         printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
267 }
268 #else
269 static void __init dtb_ioapic_setup(void) {}
270 #endif
271
272 static void __init dtb_apic_setup(void)
273 {
274         dtb_lapic_setup();
275         dtb_ioapic_setup();
276 }
277
278 #ifdef CONFIG_OF_FLATTREE
279 static void __init x86_flattree_get_config(void)
280 {
281         u32 size, map_len;
282         void *new_dtb;
283
284         if (!initial_dtb)
285                 return;
286
287         map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK),
288                         (u64)sizeof(struct boot_param_header));
289
290         initial_boot_params = early_memremap(initial_dtb, map_len);
291         size = be32_to_cpu(initial_boot_params->totalsize);
292         if (map_len < size) {
293                 early_iounmap(initial_boot_params, map_len);
294                 initial_boot_params = early_memremap(initial_dtb, size);
295                 map_len = size;
296         }
297
298         new_dtb = alloc_bootmem(size);
299         memcpy(new_dtb, initial_boot_params, size);
300         early_iounmap(initial_boot_params, map_len);
301
302         initial_boot_params = new_dtb;
303
304         /* root level address cells */
305         of_scan_flat_dt(early_init_dt_scan_root, NULL);
306
307         unflatten_device_tree();
308 }
309 #else
310 static inline void x86_flattree_get_config(void) { }
311 #endif
312
313 void __init x86_dtb_init(void)
314 {
315         x86_flattree_get_config();
316
317         if (!of_have_populated_dt())
318                 return;
319
320         dtb_setup_hpet();
321         dtb_apic_setup();
322 }
323
324 #ifdef CONFIG_X86_IO_APIC
325
326 struct of_ioapic_type {
327         u32 out_type;
328         u32 trigger;
329         u32 polarity;
330 };
331
332 static struct of_ioapic_type of_ioapic_type[] =
333 {
334         {
335                 .out_type       = IRQ_TYPE_EDGE_RISING,
336                 .trigger        = IOAPIC_EDGE,
337                 .polarity       = 1,
338         },
339         {
340                 .out_type       = IRQ_TYPE_LEVEL_LOW,
341                 .trigger        = IOAPIC_LEVEL,
342                 .polarity       = 0,
343         },
344         {
345                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
346                 .trigger        = IOAPIC_LEVEL,
347                 .polarity       = 1,
348         },
349         {
350                 .out_type       = IRQ_TYPE_EDGE_FALLING,
351                 .trigger        = IOAPIC_EDGE,
352                 .polarity       = 0,
353         },
354 };
355
356 static int ioapic_xlate(struct irq_domain *id, const u32 *intspec, u32 intsize,
357                         u32 *out_hwirq, u32 *out_type)
358 {
359         struct mp_ioapic_gsi *gsi_cfg;
360         struct io_apic_irq_attr attr;
361         struct of_ioapic_type *it;
362         u32 line, idx, type;
363
364         if (intsize < 2)
365                 return -EINVAL;
366
367         line = *intspec;
368         idx = (u32) id->priv;
369         gsi_cfg = mp_ioapic_gsi_routing(idx);
370         *out_hwirq = line + gsi_cfg->gsi_base;
371
372         intspec++;
373         type = *intspec;
374
375         if (type >= ARRAY_SIZE(of_ioapic_type))
376                 return -EINVAL;
377
378         it = of_ioapic_type + type;
379         *out_type = it->out_type;
380
381         set_io_apic_irq_attr(&attr, idx, line, it->trigger, it->polarity);
382
383         return io_apic_setup_irq_pin_once(*out_hwirq, cpu_to_node(0), &attr);
384 }
385
386 static void __init ioapic_add_ofnode(struct device_node *np)
387 {
388         struct resource r;
389         int i, ret;
390
391         ret = of_address_to_resource(np, 0, &r);
392         if (ret) {
393                 printk(KERN_ERR "Failed to obtain address for %s\n",
394                                 np->full_name);
395                 return;
396         }
397
398         for (i = 0; i < nr_ioapics; i++) {
399                 if (r.start == mpc_ioapic_addr(i)) {
400                         struct irq_domain *id;
401
402                         id = kzalloc(sizeof(*id), GFP_KERNEL);
403                         BUG_ON(!id);
404                         id->controller = np;
405                         id->xlate = ioapic_xlate;
406                         id->priv = (void *)i;
407                         add_interrupt_host(id);
408                         return;
409                 }
410         }
411         printk(KERN_ERR "IOxAPIC at %s is not registered.\n", np->full_name);
412 }
413
414 void __init x86_add_irq_domains(void)
415 {
416         struct device_node *dp;
417
418         if (!of_have_populated_dt())
419                 return;
420
421         for_each_node_with_property(dp, "interrupt-controller") {
422                 if (of_device_is_compatible(dp, "intel,ce4100-ioapic"))
423                         ioapic_add_ofnode(dp);
424         }
425 }
426 #else
427 void __init x86_add_irq_domains(void) { }
428 #endif