aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/devicetree.c
blob: 52821799a702c8c4f22719865bc90d82490294c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
/*
 * Architecture specific OF callbacks.
 */
#include <linux/bootmem.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/of_pci.h>
#include <linux/initrd.h>

#include <asm/hpet.h>
#include <asm/irq_controller.h>
#include <asm/apic.h>
#include <asm/pci_x86.h>

__initdata u64 initial_dtb;
char __initdata cmd_line[COMMAND_LINE_SIZE];
static LIST_HEAD(irq_domains);
static DEFINE_RAW_SPINLOCK(big_irq_lock);

int __initdata of_ioapic;

#ifdef CONFIG_X86_IO_APIC
static void add_interrupt_host(struct irq_domain *ih)
{
	unsigned long flags;

	raw_spin_lock_irqsave(&big_irq_lock, flags);
	list_add(&ih->l, &irq_domains);
	raw_spin_unlock_irqrestore(&big_irq_lock, flags);
}
#endif

static struct irq_domain *get_ih_from_node(struct device_node *controller)
{
	struct irq_domain *ih, *found = NULL;
	unsigned long flags;

	raw_spin_lock_irqsave(&big_irq_lock, flags);
	list_for_each_entry(ih, &irq_domains, l) {
		if (ih->controller ==  controller) {
			found = ih;
			break;
		}
	}
	raw_spin_unlock_irqrestore(&big_irq_lock, flags);
	return found;
}

unsigned int irq_create_of_mapping(struct device_node *controller,
				   const u32 *intspec, unsigned int intsize)
{
	struct irq_domain *ih;
	u32 virq, type;
	int ret;

	ih = get_ih_from_node(controller);
	if (!ih)
		return 0;
	ret = ih->xlate(ih, intspec, intsize, &virq, &type);
	if (ret)
		return 0;
	if (type == IRQ_TYPE_NONE)
		return virq;
	irq_set_irq_type(virq, type);
	return virq;
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);

unsigned long pci_address_to_pio(phys_addr_t address)
{
	/*
	 * The ioport address can be directly used by inX / outX
	 */
	BUG_ON(address >= (1 << 16));
	return (unsigned long)address;
}
EXPORT_SYMBOL_GPL(pci_address_to_pio);

void __init early_init_dt_scan_chosen_arch(unsigned long node)
{
	BUG();
}

void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
	BUG();
}

void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
{
	return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
}

#ifdef CONFIG_BLK_DEV_INITRD
void __init early_init_dt_setup_initrd_arch(unsigned long start,
					    unsigned long end)
{
	initrd_start = (unsigned long)__va(start);
	initrd_end = (unsigned long)__va(end);
	initrd_below_start_ok = 1;
}
#endif

void __init add_dtb(u64 data)
{
	initial_dtb = data + offsetof(struct setup_data, data);
}

/*
 * CE4100 ids. Will be moved to machine_device_initcall() once we have it.
 */
static struct of_device_id __initdata ce4100_ids[] = {
	{ .compatible = "intel,ce4100-cp", },
	{ .compatible = "isa", },
	{ .compatible = "pci", },
	{},
};

static int __init add_bus_probe(void)
{
	if (!of_have_populated_dt())
		return 0;

	return of_platform_bus_probe(NULL, ce4100_ids, NULL);
}
module_init(add_bus_probe);

#ifdef CONFIG_PCI
struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
{
	struct device_node *np;

	for_each_node_by_type(np, "pci") {
		const void *prop;
		unsigned int bus_min;

		prop = of_get_property(np, "bus-range", NULL);
		if (!prop)
			continue;
		bus_min = be32_to_cpup(prop);
		if (bus->number == bus_min)
			return np;
	}
	return NULL;
}

static int x86_of_pci_irq_enable(struct pci_dev *dev)
{
	struct of_irq oirq;
	u32 virq;
	int ret;
	u8 pin;

	ret = pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
	if (ret)
		return ret;
	if (!pin)
		return 0;

	ret = of_irq_map_pci(dev, &oirq);
	if (ret)
		return ret;

	virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
			oirq.size);
	if (virq == 0)
		return -EINVAL;
	dev->irq = virq;
	return 0;
}

static void x86_of_pci_irq_disable(struct pci_dev *dev)
{
}

void __cpuinit x86_of_pci_init(void)
{
	pcibios_enable_irq = x86_of_pci_irq_enable;
	pcibios_disable_irq = x86_of_pci_irq_disable;
}
#endif

static void __init dtb_setup_hpet(void)
{
#ifdef CONFIG_HPET_TIMER
	struct device_node *dn;
	struct resource r;
	int ret;

	dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-hpet");
	if (!dn)
		return;
	ret = of_address_to_resource(dn, 0, &r);
	if (ret) {
		WARN_ON(1);
		return;
	}
	hpet_address = r.start;
#endif
}

static void __init dtb_lapic_setup(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
	struct device_node *dn;
	struct resource r;
	int ret;

	dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
	if (!dn)
		return;

	ret = of_address_to_resource(dn, 0, &r);
	if (WARN_ON(ret))
		return;

	/* Did the boot loader setup the local APIC ? */
	if (!cpu_has_apic) {
		if (apic_force_enable(r.start))
			return;
	}
	smp_found_config = 1;
	pic_mode = 1;
	register_lapic_address(r.start);
	generic_processor_info(boot_cpu_physical_apicid,
			       GET_APIC_VERSION(apic_read(APIC_LVR)));
#endif
}

#ifdef CONFIG_X86_IO_APIC
static unsigned int ioapic_id;

static void __init dtb_add_ioapic(struct device_node *dn)
{
	struct resource r;
	int ret;

	ret = of_address_to_resource(dn, 0, &r);
	if (ret) {
		printk(KERN_ERR "Can't obtain address from node %s.\n",
				dn->full_name);
		return;
	}
	mp_register_ioapic(++ioapic_id, r.start, gsi_top);
}

static void __init dtb_ioapic_setup(void)
{
	struct device_node *dn;

	for_each_compatible_node(dn, NULL, "intel,ce4100-ioapic")
		dtb_add_ioapic(dn);

	if (nr_ioapics) {
		of_ioapic = 1;
		return;
	}
	printk(KERN_ERR "Error: No information about IO-APIC in OF.\n");
}
#else
static void __init dtb_ioapic_setup(void) {}
#endif

static void __init dtb_apic_setup(void)
{
	dtb_lapic_setup();
	dtb_ioapic_setup();
}

#ifdef CONFIG_OF_FLATTREE
static void __init x86_flattree_get_config(void)
{
	u32 size, map_len;
	void *new_dtb;

	if (!initial_dtb)
		return;

	map_len = max(PAGE_SIZE - (initial_dtb & ~PAGE_MASK),
			(u64)sizeof(struct boot_param_header));

	initial_boot_params = early_memremap(initial_dtb, map_len);
	size = be32_to_cpu(initial_boot_params->totalsize);
	if (map_len < size) {
		early_iounmap(initial_boot_params, map_len);
		initial_boot_params = early_memremap(initial_dtb, size);
		map_len = size;
	}

	new_dtb = alloc_bootmem(size);
	memcpy(new_dtb, initial_boot_params, size);
	early_iounmap(initial_boot_params, map_len);

	initial_boot_params = new_dtb;

	/* root level address cells */
	of_scan_flat_dt(early_init_dt_scan_root, NULL);

	unflatten_device_tree();
}
#else
static inline void x86_flattree_get_config(void) { }
#endif

void __init x86_dtb_init(void)
{
	x86_flattree_get_config();

	if (!of_have_populated_dt())
		return;

	dtb_setup_hpet();
	dtb_apic_setup();
}

#ifdef CONFIG_X86_IO_APIC

struct of_ioapic_type {
	u32 out_type;
	u32 trigger;
	u32 polarity;
};

static struct of_ioapic_type of_ioapic_type[] =
{
	{
		.out_type	= IRQ_TYPE_EDGE_RISING,
		.trigger	= IOAPIC_EDGE,
		.polarity	= 1,
	},
	{
		.out_type	= IRQ_TYPE_LEVEL_LOW,
		.trigger	= IOAPIC_LEVEL,
		.polarity	= 0,
	},
	{
		.out_type	= IRQ_TYPE_LEVEL_HIGH,
		.trigger	= IOAPIC_LEVEL,
		.polarity	= 1,
	},
	{
		.out_type	= IRQ_TYPE_EDGE_FALLING,
		.trigger	= IOAPIC_EDGE,
		.polarity	= 0,
	},
};

static int ioapic_xlate(struct irq_domain *id, const u32 *intspec, u32 intsize,
			u32 *out_hwirq, u32 *out_type)
{
	struct mp_ioapic_gsi *gsi_cfg;
	struct io_apic_irq_attr attr;
	struct of_ioapic_type *it;
	u32 line, idx, type;

	if (intsize < 2)
		return -EINVAL;

	line = *intspec;
	idx = (u32) id->priv;
	gsi_cfg = mp_ioapic_gsi_routing(idx);
	*out_hwirq = line + gsi_cfg->gsi_base;

	intspec++;
	type = *intspec;

	if (type >= ARRAY_SIZE(of_ioapic_type))
		return -EINVAL;

	it = of_ioapic_type + type;
	*out_type = it->out_type;

	set_io_apic_irq_attr(&attr, idx, line, it->trigger, it->polarity);

	return io_apic_setup_irq_pin_once(*out_hwirq, cpu_to_node(0), &attr);
}

static void __init ioapic_add_ofnode(struct device_node *np)
{
	struct resource r;
	int i, ret;

	ret = of_address_to_resource(np, 0, &r);
	if (ret) {
		printk(KERN_ERR "Failed to obtain address for %s\n",
				np->full_name);
		return;
	}

	for (i = 0; i < nr_ioapics; i++) {
		if (r.start == mpc_ioapic_addr(i)) {
			struct irq_domain *id;

			id = kzalloc(sizeof(*id), GFP_KERNEL);
			BUG_ON(!id);
			id->controller = np;
			id->xlate = ioapic_xlate;
			id->priv = (void *)i;
			add_interrupt_host(id);
			return;
		}
	}
	printk(KERN_ERR "IOxAPIC at %s is not registered.\n", np->full_name);
}

void __init x86_add_irq_domains(void)
{
	struct device_node *dp;

	if (!of_have_populated_dt())
		return;

	for_each_node_with_property(dp, "interrupt-controller") {
		if (of_device_is_compatible(dp, "intel,ce4100-ioapic"))
			ioapic_add_ofnode(dp);
	}
}
#else
void __init x86_add_irq_domains(void) { }
#endif