aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/of_device_64.c
blob: 0a6f2d1798d11b37b5f8570b8bafb0326531d164 (plain) (blame)
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
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>

#include "of_device_common.h"

void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
{
	unsigned long ret = res->start + offset;
	struct resource *r;

	if (res->flags & IORESOURCE_MEM)
		r = request_mem_region(ret, size, name);
	else
		r = request_region(ret, size, name);
	if (!r)
		ret = 0;

	return (void __iomem *) ret;
}
EXPORT_SYMBOL(of_ioremap);

void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
{
	if (res->flags & IORESOURCE_MEM)
		release_mem_region((unsigned long) base, size);
	else
		release_region((unsigned long) base, size);
}
EXPORT_SYMBOL(of_iounmap);

/*
 * PCI bus specific translator
 */

static int of_bus_pci_match(struct device_node *np)
{
	if (!strcmp(np->name, "pci")) {
		const char *model = of_get_property(np, "model", NULL);

		if (model && !strcmp(model, "SUNW,simba"))
			return 0;

		/* Do not do PCI specific frobbing if the
		 * PCI bridge lacks a ranges property.  We
		 * want to pass it through up to the next
		 * parent as-is, not with the PCI translate
		 * method which chops off the top address cell.
		 */
		if (!of_find_property(np, "ranges", NULL))
			return 0;

		return 1;
	}

	return 0;
}

static int of_bus_simba_match(struct device_node *np)
{
	const char *model = of_get_property(np, "model", NULL);

	if (model && !strcmp(model, "SUNW,simba"))
		return 1;

	/* Treat PCI busses lacking ranges property just like
	 * simba.
	 */
	if (!strcmp(np->name, "pci")) {
		if (!of_find_property(np, "ranges", NULL))
			return 1;
	}

	return 0;
}

static int of_bus_simba_map(u32 *addr, const u32 *range,
			    int na, int ns, int pna)
{
	return 0;
}

static void of_bus_pci_count_cells(struct device_node *np,
				   int *addrc, int *sizec)
{
	if (addrc)
		*addrc = 3;
	if (sizec)
		*sizec = 2;
}

static int of_bus_pci_map(u32 *addr, const u32 *range,
			  int na, int ns, int pna)
{
	u32 result[OF_MAX_ADDR_CELLS];
	int i;

	/* Check address type match */
	if (!((addr[0] ^ range[0]) & 0x03000000))
		goto type_match;

	/* Special exception, we can map a 64-bit address into
	 * a 32-bit range.
	 */
	if ((addr[0] & 0x03000000) == 0x03000000 &&
	    (range[0] & 0x03000000) == 0x02000000)
		goto type_match;

	return -EINVAL;

type_match:
	if (of_out_of_range(addr + 1, range + 1, range + na + pna,
			    na - 1, ns))
		return -EINVAL;

	/* Start with the parent range base.  */
	memcpy(result, range + na, pna * 4);

	/* Add in the child address offset, skipping high cell.  */
	for (i = 0; i < na - 1; i++)
		result[pna - 1 - i] +=
			(addr[na - 1 - i] -
			 range[na - 1 - i]);

	memcpy(addr, result, pna * 4);

	return 0;
}

static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
{
	u32 w = addr[0];

	/* For PCI, we override whatever child busses may have used.  */
	flags = 0;
	switch((w >> 24) & 0x03) {
	case 0x01:
		flags |= IORESOURCE_IO;
		break;

	case 0x02: /* 32 bits */
	case 0x03: /* 64 bits */
		flags |= IORESOURCE_MEM;
		break;
	}
	if (w & 0x40000000)
		flags |= IORESOURCE_PREFETCH;
	return flags;
}

/*
 * FHC/Central bus specific translator.
 *
 * This is just needed to hard-code the address and size cell
 * counts.  'fhc' and 'central' nodes lack the #address-cells and
 * #size-cells properties, and if you walk to the root on such
 * Enterprise boxes all you'll get is a #size-cells of 2 which is
 * not what we want to use.
 */
static int of_bus_fhc_match(struct device_node *np)
{
	return !strcmp(np->name, "fhc") ||
		!strcmp(np->name, "central");
}

#define of_bus_fhc_count_cells of_bus_sbus_count_cells

/*
 * Array of bus specific translators
 */

static struct of_bus of_busses[] = {
	/* PCI */
	{
		.name = "pci",
		.addr_prop_name = "assigned-addresses",
		.match = of_bus_pci_match,
		.count_cells = of_bus_pci_count_cells,
		.map = of_bus_pci_map,
		.get_flags = of_bus_pci_get_flags,
	},
	/* SIMBA */
	{
		.name = "simba",
		.addr_prop_name = "assigned-addresses",
		.match = of_bus_simba_match,
		.count_cells = of_bus_pci_count_cells,
		.map = of_bus_simba_map,
		.get_flags = of_bus_pci_get_flags,
	},
	/* SBUS */
	{
		.name = "sbus",
		.addr_prop_name = "reg",
		.match = of_bus_sbus_match,
		.count_cells = of_bus_sbus_count_cells,
		.map = of_bus_default_map,
		.get_flags = of_bus_default_get_flags,
	},
	/* FHC */
	{
		.name = "fhc",
		.addr_prop_name = "reg",
		.match = of_bus_fhc_match,
		.count_cells = of_bus_fhc_count_cells,
		.map = of_bus_default_map,
		.get_flags = of_bus_default_get_flags,
	},
	/* Default */
	{
		.name = "default",
		.addr_prop_name = "reg",
		.match = NULL,
		.count_cells = of_bus_default_count_cells,
		.map = of_bus_default_map,
		.get_flags = of_bus_default_get_flags,
	},
};

static struct of_bus *of_match_bus(struct device_node *np)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
		if (!of_busses[i].match || of_busses[i].match(np))
			return &of_busses[i];
	BUG();
	return NULL;
}

static int __init build_one_resource(struct device_node *parent,
				     struct of_bus *bus,
				     struct of_bus *pbus,
				     u32 *addr,
				     int na, int ns, int pna)
{
	const u32 *ranges;
	int rone, rlen;

	ranges = of_get_property(parent, "ranges", &rlen);
	if (ranges == NULL || rlen == 0) {
		u32 result[OF_MAX_ADDR_CELLS];
		int i;

		memset(result, 0, pna * 4);
		for (i = 0; i < na; i++)
			result[pna - 1 - i] =
				addr[na - 1 - i];

		memcpy(addr, result, pna * 4);
		return 0;
	}

	/* Now walk through the ranges */
	rlen /= 4;
	rone = na + pna + ns;
	for (; rlen >= rone; rlen -= rone, ranges += rone) {
		if (!bus->map(addr, ranges, na, ns, pna))
			return 0;
	}

	/* When we miss an I/O space match on PCI, just pass it up
	 * to the next PCI bridge and/or controller.
	 */
	if (!strcmp(bus->name, "pci") &&
	    (addr[0] & 0x03000000) == 0x01000000)
		return 0;

	return 1;
}

static int __init use_1to1_mapping(struct device_node *pp)
{
	/* If we have a ranges property in the parent, use it.  */
	if (of_find_property(pp, "ranges", NULL) != NULL)
		return 0;

	/* If the parent is the dma node of an ISA bus, pass
	 * the translation up to the root.
	 *
	 * Some SBUS devices use intermediate nodes to express
	 * hierarchy within the device itself.  These aren't
	 * real bus nodes, and don't have a 'ranges' property.
	 * But, we should still pass the translation work up
	 * to the SBUS itself.
	 */
	if (!strcmp(pp->name, "dma") ||
	    !strcmp(pp->name, "espdma") ||
	    !strcmp(pp->name, "ledma") ||
	    !strcmp(pp->name, "lebuffer"))
		return 0;

	/* Similarly for all PCI bridges, if we get this far
	 * it lacks a ranges property, and this will include
	 * cases like Simba.
	 */
	if (!strcmp(pp->name, "pci"))
		return 0;

	return 1;
}

static int of_resource_verbose;

static void __init build_device_resources(struct of_device *op,
					  struct device *parent)
{
	struct of_device *p_op;
	struct of_bus *bus;
	int na, ns;
	int index, num_reg;
	const void *preg;

	if (!parent)
		return;

	p_op = to_of_device(parent);
	bus = of_match_bus(p_op->node);
	bus->count_cells(op->node, &na, &ns);

	preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
	if (!preg || num_reg == 0)
		return;

	/* Convert to num-cells.  */
	num_reg /= 4;

	/* Convert to num-entries.  */
	num_reg /= na + ns;

	/* Prevent overrunning the op->resources[] array.  */
	if (num_reg > PROMREG_MAX) {
		printk(KERN_WARNING "%s: Too many regs (%d), "
		       "limiting to %d.\n",
		       op->node->full_name, num_reg, PROMREG_MAX);
		num_reg = PROMREG_MAX;
	}

	for (index = 0; index < num_reg; index++) {
		struct resource *r = &op->resource[index];
		u32 addr[OF_MAX_ADDR_CELLS];
		const u32 *reg = (preg + (index * ((na + ns) * 4)));
		struct device_node *dp = op->node;
		struct device_node *pp = p_op->node;
		struct of_bus *pbus, *dbus;
		u64 size, result = OF_BAD_ADDR;
		unsigned long flags;
		int dna, dns;
		int pna, pns;

		size = of_read_addr(reg + na, ns);
		memcpy(addr, reg, na * 4);

		flags = bus->get_flags(addr, 0);

		if (use_1to1_mapping(pp)) {
			result = of_read_addr(addr, na);
			goto build_res;
		}

		dna = na;
		dns = ns;
		dbus = bus;

		while (1) {
			dp = pp;
			pp = dp->parent;
			if (!pp) {
				result = of_read_addr(addr, dna);
				break;
			}

			pbus = of_match_bus(pp);
			pbus->count_cells(dp, &pna, &pns);

			if (build_one_resource(dp, dbus, pbus, addr,
					       dna, dns, pna))
				break;

			flags = pbus->get_flags(addr, flags);

			dna = pna;
			dns = pns;
			dbus = pbus;
		}

	build_res:
		memset(r, 0, sizeof(*r));

		if (of_resource_verbose)
			printk("%s reg[%d] -> %llx\n",
			       op->node->full_name, index,
			       result);

		if (result != OF_BAD_ADDR) {
			if (tlb_type == hypervisor)
				result &= 0x0fffffffffffffffUL;

			r->start = result;
			r->end = result + size - 1;
			r->flags = flags;
		}
		r->name = op->node->name;
	}
}

static struct device_node * __init
apply_interrupt_map(struct device_node *dp, struct device_node *pp,
		    const u32 *imap, int imlen, const u32 *imask,
		    unsigned int *irq_p)
{
	struct device_node *cp;
	unsigned int irq = *irq_p;
	struct of_bus *bus;
	phandle handle;
	const u32 *reg;
	int na, num_reg, i;

	bus = of_match_bus(pp);
	bus->count_cells(dp, &na, NULL);

	reg = of_get_property(dp, "reg", &num_reg);
	if (!reg || !num_reg)
		return NULL;

	imlen /= ((na + 3) * 4);
	handle = 0;
	for (i = 0; i < imlen; i++) {
		int j;

		for (j = 0; j < na; j++) {
			if ((reg[j] & imask[j]) != imap[j])
				goto next;
		}
		if (imap[na] == irq) {
			handle = imap[na + 1];
			irq = imap[na + 2];
			break;
		}

	next:
		imap += (na + 3);
	}
	if (i == imlen) {
		/* Psycho and Sabre PCI controllers can have 'interrupt-map'
		 * properties that do not include the on-board device
		 * interrupts.  Instead, the device's 'interrupts' property
		 * is already a fully specified INO value.
		 *
		 * Handle this by deciding that, if we didn't get a
		 * match in the parent's 'interrupt-map', and the
		 * parent is an IRQ translater, then use the parent as
		 * our IRQ controller.
		 */
		if (pp->irq_trans)
			return pp;

		return NULL;
	}

	*irq_p = irq;
	cp = of_find_node_by_phandle(handle);

	return cp;
}

static unsigned int __init pci_irq_swizzle(struct device_node *dp,
					   struct device_node *pp,
					   unsigned int irq)
{
	const struct linux_prom_pci_registers *regs;
	unsigned int bus, devfn, slot, ret;

	if (irq < 1 || irq > 4)
		return irq;

	regs = of_get_property(dp, "reg", NULL);
	if (!regs)
		return irq;

	bus = (regs->phys_hi >> 16) & 0xff;
	devfn = (regs->phys_hi >> 8) & 0xff;
	slot = (devfn >> 3) & 0x1f;

	if (pp->irq_trans) {
		/* Derived from Table 8-3, U2P User's Manual.  This branch
		 * is handling a PCI controller that lacks a proper set of
		 * interrupt-map and interrupt-map-mask properties.  The
		 * Ultra-E450 is one example.
		 *
		 * The bit layout is BSSLL, where:
		 * B: 0 on bus A, 1 on bus B
		 * D: 2-bit slot number, derived from PCI device number as
		 *    (dev - 1) for bus A, or (dev - 2) for bus B
		 * L: 2-bit line number
		 */
		if (bus & 0x80) {
			/* PBM-A */
			bus  = 0x00;
			slot = (slot - 1) << 2;
		} else {
			/* PBM-B */
			bus  = 0x10;
			slot = (slot - 2) << 2;
		}
		irq -= 1;

		ret = (bus | slot | irq);
	} else {
		/* Going through a PCI-PCI bridge that lacks a set of
		 * interrupt-map and interrupt-map-mask properties.
		 */
		ret = ((irq - 1 + (slot & 3)) & 3) + 1;
	}

	return ret;
}

static int of_irq_verbose;

static unsigned int __init build_one_device_irq(struct of_device *op,
						struct device *parent,
						unsigned int irq)
{
	struct device_node *dp = op->node;
	struct device_node *pp, *ip;
	unsigned int orig_irq = irq;
	int nid;

	if (irq == 0xffffffff)
		return irq;

	if (dp->irq_trans) {
		irq = dp->irq_trans->irq_build(dp, irq,
					       dp->irq_trans->data);

		if (of_irq_verbose)
			printk("%s: direct translate %x --> %x\n",
			       dp->full_name, orig_irq, irq);

		goto out;
	}

	/* Something more complicated.  Walk up to the root, applying
	 * interrupt-map or bus specific translations, until we hit
	 * an IRQ translator.
	 *
	 * If we hit a bus type or situation we cannot handle, we
	 * stop and assume that the original IRQ number was in a
	 * format which has special meaning to it's immediate parent.
	 */
	pp = dp->parent;
	ip = NULL;
	while (pp) {
		const void *imap, *imsk;
		int imlen;

		imap = of_get_property(pp, "interrupt-map", &imlen);
		imsk = of_get_property(pp, "interrupt-map-mask", NULL);
		if (imap && imsk) {
			struct device_node *iret;
			int this_orig_irq = irq;

			iret = apply_interrupt_map(dp, pp,
						   imap, imlen, imsk,
						   &irq);

			if (of_irq_verbose)
				printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
				       op->node->full_name,
				       pp->full_name, this_orig_irq,
				       (iret ? iret->full_name : "NULL"), irq);

			if (!iret)
				break;

			if (iret->irq_trans) {
				ip = iret;
				break;
			}
		} else {
			if (!strcmp(pp->name, "pci")) {
				unsigned int this_orig_irq = irq;

				irq = pci_irq_swizzle(dp, pp, irq);
				if (of_irq_verbose)
					printk("%s: PCI swizzle [%s] "
					       "%x --> %x\n",
					       op->node->full_name,
					       pp->full_name, this_orig_irq,
					       irq);

			}

			if (pp->irq_trans) {
				ip = pp;
				break;
			}
		}
		dp = pp;
		pp = pp->parent;
	}
	if (!ip)
		return orig_irq;

	irq = ip->irq_trans->irq_build(op->node, irq,
				       ip->irq_trans->data);
	if (of_irq_verbose)
		printk("%s: Apply IRQ trans [%s] %x --> %x\n",
		       op->node->full_name, ip->full_name, orig_irq, irq);

out:
	nid = of_node_to_nid(dp);
	if (nid != -1) {
		cpumask_t numa_mask = *cpumask_of_node(nid);

		irq_set_affinity(irq, &numa_mask);
	}

	return irq;
}

static struct of_device * __init scan_one_device(struct device_node *dp,
						 struct device *parent)
{
	struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
	const unsigned int *irq;
	struct dev_archdata *sd;
	int len, i;

	if (!op)
		return NULL;

	sd = &op->dev.archdata;
	sd->prom_node = dp;
	sd->op = op;

	op->node = dp;

	op->clock_freq = of_getintprop_default(dp, "clock-frequency",
					       (25*1000*1000));
	op->portid = of_getintprop_default(dp, "upa-portid", -1);
	if (op->portid == -1)
		op->portid = of_getintprop_default(dp, "portid", -1);

	irq = of_get_property(dp, "interrupts", &len);
	if (irq) {
		op->num_irqs = len / 4;

		/* Prevent overrunning the op->irqs[] array.  */
		if (op->num_irqs > PROMINTR_MAX) {
			printk(KERN_WARNING "%s: Too many irqs (%d), "
			       "limiting to %d.\n",
			       dp->full_name, op->num_irqs, PROMINTR_MAX);
			op->num_irqs = PROMINTR_MAX;
		}
		memcpy(op->irqs, irq, op->num_irqs * 4);
	} else {
		op->num_irqs = 0;
	}

	build_device_resources(op, parent);
	for (i = 0; i < op->num_irqs; i++)
		op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);

	op->dev.parent = parent;
	op->dev.bus = &of_platform_bus_type;
	if (!parent)
		dev_set_name(&op->dev, "root");
	else
		dev_set_name(&op->dev, "%08x", dp->node);

	if (of_device_register(op)) {
		printk("%s: Could not register of device.\n",
		       dp->full_name);
		kfree(op);
		op = NULL;
	}

	return op;
}

static void __init scan_tree(struct device_node *dp, struct device *parent)
{
	while (dp) {
		struct of_device *op = scan_one_device(dp, parent);

		if (op)
			scan_tree(dp->child, &op->dev);

		dp = dp->sibling;
	}
}

static void __init scan_of_devices(void)
{
	struct device_node *root = of_find_node_by_path("/");
	struct of_device *parent;

	parent = scan_one_device(root, NULL);
	if (!parent)
		return;

	scan_tree(root->child, &parent->dev);
}

static int __init of_bus_driver_init(void)
{
	int err;

	err = of_bus_type_init(&of_platform_bus_type, "of");
	if (!err)
		scan_of_devices();

	return err;
}

postcore_initcall(of_bus_driver_init);

static int __init of_debug(char *str)
{
	int val = 0;

	get_option(&str, &val);
	if (val & 1)
		of_resource_verbose = 1;
	if (val & 2)
		of_irq_verbose = 1;
	return 1;
}

__setup("of_debug=", of_debug);