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Merge tag 'iio-fixes-for-4.7a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[karo-tx-linux.git] / arch / x86 / kernel / devicetree.c
1 /*
2  * Architecture specific OF callbacks.
3  */
4 #include <linux/bootmem.h>
5 #include <linux/export.h>
6 #include <linux/io.h>
7 #include <linux/interrupt.h>
8 #include <linux/list.h>
9 #include <linux/of.h>
10 #include <linux/of_fdt.h>
11 #include <linux/of_address.h>
12 #include <linux/of_platform.h>
13 #include <linux/of_irq.h>
14 #include <linux/slab.h>
15 #include <linux/pci.h>
16 #include <linux/of_pci.h>
17 #include <linux/initrd.h>
18
19 #include <asm/irqdomain.h>
20 #include <asm/hpet.h>
21 #include <asm/apic.h>
22 #include <asm/pci_x86.h>
23 #include <asm/setup.h>
24 #include <asm/i8259.h>
25
26 __initdata u64 initial_dtb;
27 char __initdata cmd_line[COMMAND_LINE_SIZE];
28
29 int __initdata of_ioapic;
30
31 void __init early_init_dt_scan_chosen_arch(unsigned long node)
32 {
33         BUG();
34 }
35
36 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
37 {
38         BUG();
39 }
40
41 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
42 {
43         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
44 }
45
46 void __init add_dtb(u64 data)
47 {
48         initial_dtb = data + offsetof(struct setup_data, data);
49 }
50
51 /*
52  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
53  */
54 static struct of_device_id __initdata ce4100_ids[] = {
55         { .compatible = "intel,ce4100-cp", },
56         { .compatible = "isa", },
57         { .compatible = "pci", },
58         {},
59 };
60
61 static int __init add_bus_probe(void)
62 {
63         if (!of_have_populated_dt())
64                 return 0;
65
66         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
67 }
68 device_initcall(add_bus_probe);
69
70 #ifdef CONFIG_PCI
71 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
72 {
73         struct device_node *np;
74
75         for_each_node_by_type(np, "pci") {
76                 const void *prop;
77                 unsigned int bus_min;
78
79                 prop = of_get_property(np, "bus-range", NULL);
80                 if (!prop)
81                         continue;
82                 bus_min = be32_to_cpup(prop);
83                 if (bus->number == bus_min)
84                         return np;
85         }
86         return NULL;
87 }
88
89 static int x86_of_pci_irq_enable(struct pci_dev *dev)
90 {
91         u32 virq;
92         int ret;
93         u8 pin;
94
95         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
96         if (ret)
97                 return ret;
98         if (!pin)
99                 return 0;
100
101         virq = of_irq_parse_and_map_pci(dev, 0, 0);
102         if (virq == 0)
103                 return -EINVAL;
104         dev->irq = virq;
105         return 0;
106 }
107
108 static void x86_of_pci_irq_disable(struct pci_dev *dev)
109 {
110 }
111
112 void x86_of_pci_init(void)
113 {
114         pcibios_enable_irq = x86_of_pci_irq_enable;
115         pcibios_disable_irq = x86_of_pci_irq_disable;
116 }
117 #endif
118
119 static void __init dtb_setup_hpet(void)
120 {
121 #ifdef CONFIG_HPET_TIMER
122         struct device_node *dn;
123         struct resource r;
124         int ret;
125
126         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
127         if (!dn)
128                 return;
129         ret = of_address_to_resource(dn, 0, &r);
130         if (ret) {
131                 WARN_ON(1);
132                 return;
133         }
134         hpet_address = r.start;
135 #endif
136 }
137
138 static void __init dtb_lapic_setup(void)
139 {
140 #ifdef CONFIG_X86_LOCAL_APIC
141         struct device_node *dn;
142         struct resource r;
143         int ret;
144
145         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
146         if (!dn)
147                 return;
148
149         ret = of_address_to_resource(dn, 0, &r);
150         if (WARN_ON(ret))
151                 return;
152
153         /* Did the boot loader setup the local APIC ? */
154         if (!boot_cpu_has(X86_FEATURE_APIC)) {
155                 if (apic_force_enable(r.start))
156                         return;
157         }
158         smp_found_config = 1;
159         pic_mode = 1;
160         register_lapic_address(r.start);
161         generic_processor_info(boot_cpu_physical_apicid,
162                                GET_APIC_VERSION(apic_read(APIC_LVR)));
163 #endif
164 }
165
166 #ifdef CONFIG_X86_IO_APIC
167 static unsigned int ioapic_id;
168
169 struct of_ioapic_type {
170         u32 out_type;
171         u32 trigger;
172         u32 polarity;
173 };
174
175 static struct of_ioapic_type of_ioapic_type[] =
176 {
177         {
178                 .out_type       = IRQ_TYPE_EDGE_RISING,
179                 .trigger        = IOAPIC_EDGE,
180                 .polarity       = 1,
181         },
182         {
183                 .out_type       = IRQ_TYPE_LEVEL_LOW,
184                 .trigger        = IOAPIC_LEVEL,
185                 .polarity       = 0,
186         },
187         {
188                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
189                 .trigger        = IOAPIC_LEVEL,
190                 .polarity       = 1,
191         },
192         {
193                 .out_type       = IRQ_TYPE_EDGE_FALLING,
194                 .trigger        = IOAPIC_EDGE,
195                 .polarity       = 0,
196         },
197 };
198
199 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
200                               unsigned int nr_irqs, void *arg)
201 {
202         struct of_phandle_args *irq_data = (void *)arg;
203         struct of_ioapic_type *it;
204         struct irq_alloc_info tmp;
205
206         if (WARN_ON(irq_data->args_count < 2))
207                 return -EINVAL;
208         if (irq_data->args[1] >= ARRAY_SIZE(of_ioapic_type))
209                 return -EINVAL;
210
211         it = &of_ioapic_type[irq_data->args[1]];
212         ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->trigger, it->polarity);
213         tmp.ioapic_id = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
214         tmp.ioapic_pin = irq_data->args[0];
215
216         return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
217 }
218
219 static const struct irq_domain_ops ioapic_irq_domain_ops = {
220         .alloc          = dt_irqdomain_alloc,
221         .free           = mp_irqdomain_free,
222         .activate       = mp_irqdomain_activate,
223         .deactivate     = mp_irqdomain_deactivate,
224 };
225
226 static void __init dtb_add_ioapic(struct device_node *dn)
227 {
228         struct resource r;
229         int ret;
230         struct ioapic_domain_cfg cfg = {
231                 .type = IOAPIC_DOMAIN_DYNAMIC,
232                 .ops = &ioapic_irq_domain_ops,
233                 .dev = dn,
234         };
235
236         ret = of_address_to_resource(dn, 0, &r);
237         if (ret) {
238                 printk(KERN_ERR "Can't obtain address from node %s.\n",
239                                 dn->full_name);
240                 return;
241         }
242         mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
243 }
244
245 static void __init dtb_ioapic_setup(void)
246 {
247         struct device_node *dn;
248
249         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
250                 dtb_add_ioapic(dn);
251
252         if (nr_ioapics) {
253                 of_ioapic = 1;
254                 return;
255         }
256         printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
257 }
258 #else
259 static void __init dtb_ioapic_setup(void) {}
260 #endif
261
262 static void __init dtb_apic_setup(void)
263 {
264         dtb_lapic_setup();
265         dtb_ioapic_setup();
266 }
267
268 #ifdef CONFIG_OF_FLATTREE
269 static void __init x86_flattree_get_config(void)
270 {
271         u32 size, map_len;
272         void *dt;
273
274         if (!initial_dtb)
275                 return;
276
277         map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
278
279         initial_boot_params = dt = early_memremap(initial_dtb, map_len);
280         size = of_get_flat_dt_size();
281         if (map_len < size) {
282                 early_memunmap(dt, map_len);
283                 initial_boot_params = dt = early_memremap(initial_dtb, size);
284                 map_len = size;
285         }
286
287         unflatten_and_copy_device_tree();
288         early_memunmap(dt, map_len);
289 }
290 #else
291 static inline void x86_flattree_get_config(void) { }
292 #endif
293
294 void __init x86_dtb_init(void)
295 {
296         x86_flattree_get_config();
297
298         if (!of_have_populated_dt())
299                 return;
300
301         dtb_setup_hpet();
302         dtb_apic_setup();
303 }