aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc/kernel/of_device_32.c
blob: 2d055a1e9cc2b483d2aebbae083b21ddea0bf5ec (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
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
#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 <asm/leon.h>
#include <asm/leon_amba.h>

#include "of_device_common.h"

/*
 * PCI bus specific translator
 */

static int of_bus_pci_match(struct device_node *np)
{
	if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
		/* 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 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)
		return -EINVAL;

	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;
}

static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
{
	return IORESOURCE_MEM;
}

 /*
 * AMBAPP bus specific translator
 */

static int of_bus_ambapp_match(struct device_node *np)
{
	return !strcmp(np->type, "ambapp");
}

static void of_bus_ambapp_count_cells(struct device_node *child,
				      int *addrc, int *sizec)
{
	if (addrc)
		*addrc = 1;
	if (sizec)
		*sizec = 1;
}

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

static unsigned long of_bus_ambapp_get_flags(const u32 *addr,
					     unsigned long flags)
{
	return IORESOURCE_MEM;
}

/*
 * 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,
	},
	/* 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_sbus_get_flags,
	},
	/* AMBA */
	{
		.name = "ambapp",
		.addr_prop_name = "reg",
		.match = of_bus_ambapp_match,
		.count_cells = of_bus_ambapp_count_cells,
		.map = of_bus_ambapp_map,
		.get_flags = of_bus_ambapp_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;
	unsigned int rlen;
	int rone;

	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;
	}

	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;

	/* 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;

	return 1;
}

static int of_resource_verbose;

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

	if (!parent)
		return;

	p_op = to_platform_device(parent);
	bus = of_match_bus(p_op->dev.of_node);
	bus->count_cells(op->dev.of_node, &na, &ns);

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

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

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

	op->resource = op->archdata.resource;
	op->num_resources = num_reg;
	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->dev.of_node;
		struct device_node *pp = p_op->dev.of_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(reg, 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->dev.of_node->full_name, index,
			       result);

		if (result != OF_BAD_ADDR) {
			r->start = result & 0xffffffff;
			r->end = result + size - 1;
			r->flags = flags | ((result >> 32ULL) & 0xffUL);
		}
		r->name = op->dev.of_node->name;
	}
}

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

	if (!op)
		return NULL;

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

	op->dev.of_node = dp;

	intr = of_get_property(dp, "intr", &len);
	if (intr) {
		op->archdata.num_irqs = len / sizeof(struct linux_prom_irqs);
		for (i = 0; i < op->archdata.num_irqs; i++)
			op->archdata.irqs[i] = intr[i].pri;
	} else {
		const unsigned int *irq =
			of_get_property(dp, "interrupts", &len);

		if (irq) {
			op->archdata.num_irqs = len / sizeof(unsigned int);
			for (i = 0; i < op->archdata.num_irqs; i++)
				op->archdata.irqs[i] = irq[i];
		} else {
			op->archdata.num_irqs = 0;
		}
	}
	if (sparc_cpu_model == sun4d) {
		static int pil_to_sbus[] = {
			0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
		};
		struct device_node *io_unit, *sbi = dp->parent;
		const struct linux_prom_registers *regs;
		int board, slot;

		while (sbi) {
			if (!strcmp(sbi->name, "sbi"))
				break;

			sbi = sbi->parent;
		}
		if (!sbi)
			goto build_resources;

		regs = of_get_property(dp, "reg", NULL);
		if (!regs)
			goto build_resources;

		slot = regs->which_io;

		/* If SBI's parent is not io-unit or the io-unit lacks
		 * a "board#" property, something is very wrong.
		 */
		if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
			printk("%s: Error, parent is not io-unit.\n",
			       sbi->full_name);
			goto build_resources;
		}
		io_unit = sbi->parent;
		board = of_getintprop_default(io_unit, "board#", -1);
		if (board == -1) {
			printk("%s: Error, lacks board# property.\n",
			       io_unit->full_name);
			goto build_resources;
		}

		for (i = 0; i < op->archdata.num_irqs; i++) {
			int this_irq = op->archdata.irqs[i];
			int sbusl = pil_to_sbus[this_irq];

			if (sbusl)
				this_irq = (((board + 1) << 5) +
					    (sbusl << 2) +
					    slot);

			op->archdata.irqs[i] = this_irq;
		}
	}

build_resources:
	build_device_resources(op, parent);

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

	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 platform_device *op = scan_one_device(dp, parent);

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

		dp = dp->sibling;
	}
}

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

	parent = scan_one_device(root, NULL);
	if (!parent)
		return 0;

	scan_tree(root->child, &parent->dev);
	return 0;
}
postcore_initcall(scan_of_devices);

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

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

__setup("of_debug=", of_debug);