GNU Linux-libre 4.14.266-gnu1
[releases.git] / arch / x86 / kernel / devicetree.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Architecture specific OF callbacks.
4  */
5 #include <linux/bootmem.h>
6 #include <linux/export.h>
7 #include <linux/io.h>
8 #include <linux/interrupt.h>
9 #include <linux/list.h>
10 #include <linux/of.h>
11 #include <linux/of_fdt.h>
12 #include <linux/of_address.h>
13 #include <linux/of_platform.h>
14 #include <linux/of_irq.h>
15 #include <linux/libfdt.h>
16 #include <linux/slab.h>
17 #include <linux/pci.h>
18 #include <linux/of_pci.h>
19 #include <linux/initrd.h>
20
21 #include <asm/irqdomain.h>
22 #include <asm/hpet.h>
23 #include <asm/apic.h>
24 #include <asm/pci_x86.h>
25 #include <asm/setup.h>
26 #include <asm/i8259.h>
27
28 __initdata u64 initial_dtb;
29 char __initdata cmd_line[COMMAND_LINE_SIZE];
30
31 int __initdata of_ioapic;
32
33 void __init early_init_dt_scan_chosen_arch(unsigned long node)
34 {
35         BUG();
36 }
37
38 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
39 {
40         BUG();
41 }
42
43 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
44 {
45         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
46 }
47
48 void __init add_dtb(u64 data)
49 {
50         initial_dtb = data + offsetof(struct setup_data, data);
51 }
52
53 /*
54  * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
55  */
56 static struct of_device_id __initdata ce4100_ids[] = {
57         { .compatible = "intel,ce4100-cp", },
58         { .compatible = "isa", },
59         { .compatible = "pci", },
60         {},
61 };
62
63 static int __init add_bus_probe(void)
64 {
65         if (!of_have_populated_dt())
66                 return 0;
67
68         return of_platform_bus_probe(NULL, ce4100_ids, NULL);
69 }
70 device_initcall(add_bus_probe);
71
72 #ifdef CONFIG_PCI
73 struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
74 {
75         struct device_node *np;
76
77         for_each_node_by_type(np, "pci") {
78                 const void *prop;
79                 unsigned int bus_min;
80
81                 prop = of_get_property(np, "bus-range", NULL);
82                 if (!prop)
83                         continue;
84                 bus_min = be32_to_cpup(prop);
85                 if (bus->number == bus_min)
86                         return np;
87         }
88         return NULL;
89 }
90
91 static int x86_of_pci_irq_enable(struct pci_dev *dev)
92 {
93         u32 virq;
94         int ret;
95         u8 pin;
96
97         ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
98         if (ret)
99                 return ret;
100         if (!pin)
101                 return 0;
102
103         virq = of_irq_parse_and_map_pci(dev, 0, 0);
104         if (virq == 0)
105                 return -EINVAL;
106         dev->irq = virq;
107         return 0;
108 }
109
110 static void x86_of_pci_irq_disable(struct pci_dev *dev)
111 {
112 }
113
114 void x86_of_pci_init(void)
115 {
116         pcibios_enable_irq = x86_of_pci_irq_enable;
117         pcibios_disable_irq = x86_of_pci_irq_disable;
118 }
119 #endif
120
121 static void __init dtb_setup_hpet(void)
122 {
123 #ifdef CONFIG_HPET_TIMER
124         struct device_node *dn;
125         struct resource r;
126         int ret;
127
128         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
129         if (!dn)
130                 return;
131         ret = of_address_to_resource(dn, 0, &r);
132         if (ret) {
133                 WARN_ON(1);
134                 return;
135         }
136         hpet_address = r.start;
137 #endif
138 }
139
140 static void __init dtb_lapic_setup(void)
141 {
142 #ifdef CONFIG_X86_LOCAL_APIC
143         struct device_node *dn;
144         struct resource r;
145         int ret;
146
147         dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
148         if (!dn)
149                 return;
150
151         ret = of_address_to_resource(dn, 0, &r);
152         if (WARN_ON(ret))
153                 return;
154
155         /* Did the boot loader setup the local APIC ? */
156         if (!boot_cpu_has(X86_FEATURE_APIC)) {
157                 if (apic_force_enable(r.start))
158                         return;
159         }
160         smp_found_config = 1;
161         pic_mode = 1;
162         register_lapic_address(r.start);
163         generic_processor_info(boot_cpu_physical_apicid,
164                                GET_APIC_VERSION(apic_read(APIC_LVR)));
165 #endif
166 }
167
168 #ifdef CONFIG_X86_IO_APIC
169 static unsigned int ioapic_id;
170
171 struct of_ioapic_type {
172         u32 out_type;
173         u32 trigger;
174         u32 polarity;
175 };
176
177 static struct of_ioapic_type of_ioapic_type[] =
178 {
179         {
180                 .out_type       = IRQ_TYPE_EDGE_RISING,
181                 .trigger        = IOAPIC_EDGE,
182                 .polarity       = 1,
183         },
184         {
185                 .out_type       = IRQ_TYPE_LEVEL_LOW,
186                 .trigger        = IOAPIC_LEVEL,
187                 .polarity       = 0,
188         },
189         {
190                 .out_type       = IRQ_TYPE_LEVEL_HIGH,
191                 .trigger        = IOAPIC_LEVEL,
192                 .polarity       = 1,
193         },
194         {
195                 .out_type       = IRQ_TYPE_EDGE_FALLING,
196                 .trigger        = IOAPIC_EDGE,
197                 .polarity       = 0,
198         },
199 };
200
201 static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
202                               unsigned int nr_irqs, void *arg)
203 {
204         struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
205         struct of_ioapic_type *it;
206         struct irq_alloc_info tmp;
207         int type_index;
208
209         if (WARN_ON(fwspec->param_count < 2))
210                 return -EINVAL;
211
212         type_index = fwspec->param[1];
213         if (type_index >= ARRAY_SIZE(of_ioapic_type))
214                 return -EINVAL;
215
216         it = &of_ioapic_type[type_index];
217         ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->trigger, it->polarity);
218         tmp.ioapic_id = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
219         tmp.ioapic_pin = fwspec->param[0];
220
221         return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
222 }
223
224 static const struct irq_domain_ops ioapic_irq_domain_ops = {
225         .alloc          = dt_irqdomain_alloc,
226         .free           = mp_irqdomain_free,
227         .activate       = mp_irqdomain_activate,
228         .deactivate     = mp_irqdomain_deactivate,
229 };
230
231 static void __init dtb_add_ioapic(struct device_node *dn)
232 {
233         struct resource r;
234         int ret;
235         struct ioapic_domain_cfg cfg = {
236                 .type = IOAPIC_DOMAIN_DYNAMIC,
237                 .ops = &ioapic_irq_domain_ops,
238                 .dev = dn,
239         };
240
241         ret = of_address_to_resource(dn, 0, &r);
242         if (ret) {
243                 printk(KERN_ERR "Can't obtain address from device node %pOF.\n", dn);
244                 return;
245         }
246         mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
247 }
248
249 static void __init dtb_ioapic_setup(void)
250 {
251         struct device_node *dn;
252
253         for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
254                 dtb_add_ioapic(dn);
255
256         if (nr_ioapics) {
257                 of_ioapic = 1;
258                 return;
259         }
260         printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
261 }
262 #else
263 static void __init dtb_ioapic_setup(void) {}
264 #endif
265
266 static void __init dtb_apic_setup(void)
267 {
268         dtb_lapic_setup();
269         dtb_ioapic_setup();
270 }
271
272 #ifdef CONFIG_OF_FLATTREE
273 static void __init x86_flattree_get_config(void)
274 {
275         u32 size, map_len;
276         void *dt;
277
278         if (!initial_dtb)
279                 return;
280
281         map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK), (u64)128);
282
283         dt = early_memremap(initial_dtb, map_len);
284         size = fdt_totalsize(dt);
285         if (map_len < size) {
286                 early_memunmap(dt, map_len);
287                 dt = early_memremap(initial_dtb, size);
288                 map_len = size;
289         }
290
291         early_init_dt_verify(dt);
292         unflatten_and_copy_device_tree();
293         early_memunmap(dt, map_len);
294 }
295 #else
296 static inline void x86_flattree_get_config(void) { }
297 #endif
298
299 void __init x86_dtb_init(void)
300 {
301         x86_flattree_get_config();
302
303         if (!of_have_populated_dt())
304                 return;
305
306         dtb_setup_hpet();
307         dtb_apic_setup();
308 }