x86: ioapic: Add OF bindings for IO_APIC
[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
17 #include <asm/hpet.h>
18 #include <asm/irq_controller.h>
19 #include <asm/apic.h>
20 #include <asm/pci_x86.h>
21
22 __initdata u64 initial_dtb;
23 char __initdata cmd_line[COMMAND_LINE_SIZE];
24 static LIST_HEAD(irq_domains);
25 static DEFINE_RAW_SPINLOCK(big_irq_lock);
26
27 int __initdata of_ioapic;
28
29 void add_interrupt_host(struct irq_domain *ih)
30 {
31         unsigned long flags;
32
33         raw_spin_lock_irqsave(&big_irq_lock, flags);
34         list_add(&ih->l, &irq_domains);
35         raw_spin_unlock_irqrestore(&big_irq_lock, flags);
36 }
37
38 static struct irq_domain *get_ih_from_node(struct device_node *controller)
39 {
40         struct irq_domain *ih, *found = NULL;
41         unsigned long flags;
42
43         raw_spin_lock_irqsave(&big_irq_lock, flags);
44         list_for_each_entry(ih, &irq_domains, l) {
45                 if (ih->controller ==  controller) {
46                         found = ih;
47                         break;
48                 }
49         }
50         raw_spin_unlock_irqrestore(&big_irq_lock, flags);
51         return found;
52 }
53
54 unsigned int irq_create_of_mapping(struct device_node *controller,
55                                    const u32 *intspec, unsigned int intsize)
56 {
57         struct irq_domain *ih;
58         u32 virq, type;
59         int ret;
60
61         ih = get_ih_from_node(controller);
62         if (!ih)
63                 return 0;
64         ret = ih->xlate(ih, intspec, intsize, &virq, &type);
65         if (ret)
66                 return ret;
67         if (type == IRQ_TYPE_NONE)
68                 return virq;
69         /* set the mask if it is different from current */
70         if (type == (irq_to_desc(virq)->status & IRQF_TRIGGER_MASK))
71                 set_irq_type(virq, type);
72         return virq;
73 }
74 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
75
76 unsigned long pci_address_to_pio(phys_addr_t address)
77 {
78         /*
79          * The ioport address can be directly used by inX / outX
80          */
81         BUG_ON(address >= (1 << 16));
82         return (unsigned long)address;
83 }
84 EXPORT_SYMBOL_GPL(pci_address_to_pio);
85
86 void __init early_init_dt_scan_chosen_arch(unsigned long node)
87 {
88         BUG();
89 }
90
91 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
92 {
93         BUG();
94 }
95
96 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
97 {
98         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
99 }
100
101 void __init add_dtb(u64 data)
102 {
103         initial_dtb = data + offsetof(struct setup_data, data);
104 }
105
106 /*
107  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
108  */
109 static struct of_device_id __initdata ce4100_ids[] = {
110         { .compatible = "intel,ce4100-cp", },
111         { .compatible = "isa", },
112         { .compatible = "pci", },
113         {},
114 };
115
116 static int __init add_bus_probe(void)
117 {
118         if (!initial_boot_params)
119                 return 0;
120
121         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
122 }
123 module_init(add_bus_probe);
124
125 #ifdef CONFIG_PCI
126 static int x86_of_pci_irq_enable(struct pci_dev *dev)
127 {
128         struct of_irq oirq;
129         u32 virq;
130         int ret;
131         u8 pin;
132
133         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
134         if (ret)
135                 return ret;
136         if (!pin)
137                 return 0;
138
139         ret = of_irq_map_pci(dev, &oirq);
140         if (ret)
141                 return ret;
142
143         virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
144                         oirq.size);
145         if (virq == 0)
146                 return -EINVAL;
147         dev->irq = virq;
148         return 0;
149 }
150
151 static void x86_of_pci_irq_disable(struct pci_dev *dev)
152 {
153 }
154
155 void __cpuinit x86_of_pci_init(void)
156 {
157         struct device_node *np;
158
159         pcibios_enable_irq = x86_of_pci_irq_enable;
160         pcibios_disable_irq = x86_of_pci_irq_disable;
161
162         for_each_node_by_type(np, "pci") {
163                 const void *prop;
164                 struct pci_bus *bus;
165                 unsigned int bus_min;
166                 struct device_node *child;
167
168                 prop = of_get_property(np, "bus-range", NULL);
169                 if (!prop)
170                         continue;
171                 bus_min = be32_to_cpup(prop);
172
173                 bus = pci_find_bus(0, bus_min);
174                 if (!bus) {
175                         printk(KERN_ERR "Can't find a node for bus %s.\n",
176                                         np->full_name);
177                         continue;
178                 }
179
180                 if (bus->self)
181                         bus->self->dev.of_node = np;
182                 else
183                         bus->dev.of_node = np;
184
185                 for_each_child_of_node(np, child) {
186                         struct pci_dev *dev;
187                         u32 devfn;
188
189                         prop = of_get_property(child, "reg", NULL);
190                         if (!prop)
191                                 continue;
192
193                         devfn = (be32_to_cpup(prop) >> 8) & 0xff;
194                         dev = pci_get_slot(bus, devfn);
195                         if (!dev)
196                                 continue;
197                         dev->dev.of_node = child;
198                         pci_dev_put(dev);
199                 }
200         }
201 }
202 #endif
203
204 static void __init dtb_setup_hpet(void)
205 {
206         struct device_node *dn;
207         struct resource r;
208         int ret;
209
210         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
211         if (!dn)
212                 return;
213         ret = of_address_to_resource(dn, 0, &r);
214         if (ret) {
215                 WARN_ON(1);
216                 return;
217         }
218         hpet_address = r.start;
219 }
220
221 static void __init dtb_lapic_setup(void)
222 {
223 #ifdef CONFIG_X86_LOCAL_APIC
224         if (apic_force_enable())
225                 return;
226
227         smp_found_config = 1;
228         pic_mode = 1;
229         /* Required for ioapic registration */
230         set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
231         if (boot_cpu_physical_apicid == -1U)
232                 boot_cpu_physical_apicid = read_apic_id();
233
234         generic_processor_info(boot_cpu_physical_apicid,
235                         GET_APIC_VERSION(apic_read(APIC_LVR)));
236 #endif
237 }
238
239 #ifdef CONFIG_X86_IO_APIC
240 static unsigned int ioapic_id;
241
242 static void __init dtb_add_ioapic(struct device_node *dn)
243 {
244         struct resource r;
245         int ret;
246
247         ret = of_address_to_resource(dn, 0, &r);
248         if (ret) {
249                 printk(KERN_ERR "Can't obtain address from node %s.\n",
250                                 dn->full_name);
251                 return;
252         }
253         mp_register_ioapic(++ioapic_id, r.start, gsi_top);
254 }
255
256 static void __init dtb_ioapic_setup(void)
257 {
258         struct device_node *dn;
259
260         if (!smp_found_config)
261                 return;
262
263         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
264                 dtb_add_ioapic(dn);
265
266         if (nr_ioapics) {
267                 of_ioapic = 1;
268                 return;
269         }
270         printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
271         smp_found_config = 0;
272 }
273 #else
274 static void __init dtb_ioapic_setup(void) {}
275 #endif
276
277 static void __init dtb_apic_setup(void)
278 {
279         dtb_lapic_setup();
280         dtb_ioapic_setup();
281 }
282
283 void __init x86_dtb_find_config(void)
284 {
285         if (initial_dtb)
286                 smp_found_config = 1;
287         else
288                 printk(KERN_ERR "Missing device tree!.\n");
289 }
290
291 void __init x86_dtb_get_config(unsigned int unused)
292 {
293         u32 size, map_len;
294         void *new_dtb;
295
296         if (!initial_dtb)
297                 return;
298
299         map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK),
300                         (u64)sizeof(struct boot_param_header));
301
302         initial_boot_params = early_memremap(initial_dtb, map_len);
303         size = be32_to_cpu(initial_boot_params->totalsize);
304         if (map_len < size) {
305                 early_iounmap(initial_boot_params, map_len);
306                 initial_boot_params = early_memremap(initial_dtb, size);
307                 map_len = size;
308         }
309
310         new_dtb = alloc_bootmem(size);
311         memcpy(new_dtb, initial_boot_params, size);
312         early_iounmap(initial_boot_params, map_len);
313
314         initial_boot_params = new_dtb;
315
316         /* root level address cells */
317         of_scan_flat_dt(early_init_dt_scan_root, NULL);
318
319         unflatten_device_tree();
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 io_apic_irq_attr attr;
360         struct of_ioapic_type *it;
361         u32 line, idx, type;
362
363         if (intsize < 2)
364                 return -EINVAL;
365
366         line = *intspec;
367         idx = (u32) id->priv;
368         *out_hwirq = line + mp_gsi_routing[idx].gsi_base;
369
370         intspec++;
371         type = *intspec;
372
373         if (type >= ARRAY_SIZE(of_ioapic_type))
374                 return -EINVAL;
375
376         it = of_ioapic_type + type;
377         *out_type = it->out_type;
378
379         set_io_apic_irq_attr(&attr, idx, line, it->trigger, it->polarity);
380
381         return io_apic_setup_irq_pin(*out_hwirq, cpu_to_node(0), &attr);
382 }
383
384 static void __init ioapic_add_ofnode(struct device_node *np)
385 {
386         struct resource r;
387         int i, ret;
388
389         ret = of_address_to_resource(np, 0, &r);
390         if (ret) {
391                 printk(KERN_ERR "Failed to obtain address for %s\n",
392                                 np->full_name);
393                 return;
394         }
395
396         for (i = 0; i < nr_ioapics; i++) {
397                 if (r.start == mp_ioapics[i].apicaddr) {
398                         struct irq_domain *id;
399
400                         id = kzalloc(sizeof(*id), GFP_KERNEL);
401                         BUG_ON(!id);
402                         id->controller = np;
403                         id->xlate = ioapic_xlate;
404                         id->priv = (void *)i;
405                         add_interrupt_host(id);
406                         return;
407                 }
408         }
409         printk(KERN_ERR "IOxAPIC at %s is not registered.\n", np->full_name);
410 }
411
412 void __init x86_add_irq_domains(void)
413 {
414         struct device_node *dp;
415
416         if (!initial_boot_params)
417                 return;
418
419         for_each_node_with_property(dp, "interrupt-controller") {
420                 if (of_device_is_compatible(dp, "intel,ce4100-ioapic"))
421                         ioapic_add_ofnode(dp);
422         }
423 }
424 #else
425 void __init x86_add_irq_domains(void) { }
426 #endif