aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/iseries/dt.c
blob: e305deee7f44e19d08d41922f581836d66a743d4 (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
/*
 *    Copyright (C) 2005-2006 Michael Ellerman, IBM Corporation
 *    Copyright (C) 2000-2004, IBM Corporation
 *
 *    Description:
 *      This file contains all the routines to build a flattened device
 *      tree for a legacy iSeries machine.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#undef DEBUG

#include <linux/types.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/pci_ids.h>
#include <linux/threads.h>
#include <linux/bitops.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/if_ether.h>	/* ETH_ALEN */

#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/lppaca.h>
#include <asm/cputable.h>
#include <asm/abs_addr.h>
#include <asm/system.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_call_xm.h>
#include <asm/udbg.h>

#include "processor_vpd.h"
#include "call_hpt.h"
#include "call_pci.h"
#include "pci.h"
#include "it_exp_vpd_panel.h"

#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

/*
 * These are created by the linker script at the start and end
 * of the section containing all the strings from this file.
 */
extern char __dt_strings_start[];
extern char __dt_strings_end[];

struct iseries_flat_dt {
	struct boot_param_header header;
	u64 reserve_map[2];
};

static void * __initdata dt_data;

/*
 * Putting these strings here keeps them out of the section
 * that we rename to .dt_strings using objcopy and capture
 * for the strings blob of the flattened device tree.
 */
static char __initdata device_type_cpu[] = "cpu";
static char __initdata device_type_memory[] = "memory";
static char __initdata device_type_serial[] = "serial";
static char __initdata device_type_network[] = "network";
static char __initdata device_type_block[] = "block";
static char __initdata device_type_byte[] = "byte";
static char __initdata device_type_pci[] = "pci";
static char __initdata device_type_vdevice[] = "vdevice";
static char __initdata device_type_vscsi[] = "vscsi";


/* EBCDIC to ASCII conversion routines */

static unsigned char __init e2a(unsigned char x)
{
	switch (x) {
	case 0x81 ... 0x89:
		return x - 0x81 + 'a';
	case 0x91 ... 0x99:
		return x - 0x91 + 'j';
	case 0xA2 ... 0xA9:
		return x - 0xA2 + 's';
	case 0xC1 ... 0xC9:
		return x - 0xC1 + 'A';
	case 0xD1 ... 0xD9:
		return x - 0xD1 + 'J';
	case 0xE2 ... 0xE9:
		return x - 0xE2 + 'S';
	case 0xF0 ... 0xF9:
		return x - 0xF0 + '0';
	}
	return ' ';
}

static unsigned char * __init strne2a(unsigned char *dest,
		const unsigned char *src, size_t n)
{
	int i;

	n = strnlen(src, n);

	for (i = 0; i < n; i++)
		dest[i] = e2a(src[i]);

	return dest;
}

static struct iseries_flat_dt * __init dt_init(void)
{
	struct iseries_flat_dt *dt;
	unsigned long str_len;

	str_len = __dt_strings_end - __dt_strings_start;
	dt = (struct iseries_flat_dt *)ALIGN(klimit, 8);
	dt->header.off_mem_rsvmap =
		offsetof(struct iseries_flat_dt, reserve_map);
	dt->header.off_dt_strings = ALIGN(sizeof(*dt), 8);
	dt->header.off_dt_struct = dt->header.off_dt_strings
		+ ALIGN(str_len, 8);
	dt_data = (void *)((unsigned long)dt + dt->header.off_dt_struct);
	dt->header.dt_strings_size = str_len;

	/* There is no notion of hardware cpu id on iSeries */
	dt->header.boot_cpuid_phys = smp_processor_id();

	memcpy((char *)dt + dt->header.off_dt_strings, __dt_strings_start,
			str_len);

	dt->header.magic = OF_DT_HEADER;
	dt->header.version = 0x10;
	dt->header.last_comp_version = 0x10;

	dt->reserve_map[0] = 0;
	dt->reserve_map[1] = 0;

	return dt;
}

static void __init dt_push_u32(struct iseries_flat_dt *dt, u32 value)
{
	*((u32 *)dt_data) = value;
	dt_data += sizeof(u32);
}

#ifdef notyet
static void __init dt_push_u64(struct iseries_flat_dt *dt, u64 value)
{
	*((u64 *)dt_data) = value;
	dt_data += sizeof(u64);
}
#endif

static void __init dt_push_bytes(struct iseries_flat_dt *dt, const char *data,
		int len)
{
	memcpy(dt_data, data, len);
	dt_data += ALIGN(len, 4);
}

static void __init dt_start_node(struct iseries_flat_dt *dt, const char *name)
{
	dt_push_u32(dt, OF_DT_BEGIN_NODE);
	dt_push_bytes(dt, name, strlen(name) + 1);
}

#define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE)

static void __init dt_prop(struct iseries_flat_dt *dt, const char *name,
		const void *data, int len)
{
	unsigned long offset;

	dt_push_u32(dt, OF_DT_PROP);

	/* Length of the data */
	dt_push_u32(dt, len);

	offset = name - __dt_strings_start;

	/* The offset of the properties name in the string blob. */
	dt_push_u32(dt, (u32)offset);

	/* The actual data. */
	dt_push_bytes(dt, data, len);
}

static void __init dt_prop_str(struct iseries_flat_dt *dt, const char *name,
		const char *data)
{
	dt_prop(dt, name, data, strlen(data) + 1); /* + 1 for NULL */
}

static void __init dt_prop_u32(struct iseries_flat_dt *dt, const char *name,
		u32 data)
{
	dt_prop(dt, name, &data, sizeof(u32));
}

#ifdef notyet
static void __init dt_prop_u64(struct iseries_flat_dt *dt, const char *name,
		u64 data)
{
	dt_prop(dt, name, &data, sizeof(u64));
}
#endif

static void __init dt_prop_u64_list(struct iseries_flat_dt *dt,
		const char *name, u64 *data, int n)
{
	dt_prop(dt, name, data, sizeof(u64) * n);
}

static void __init dt_prop_u32_list(struct iseries_flat_dt *dt,
		const char *name, u32 *data, int n)
{
	dt_prop(dt, name, data, sizeof(u32) * n);
}

#ifdef notyet
static void __init dt_prop_empty(struct iseries_flat_dt *dt, const char *name)
{
	dt_prop(dt, name, NULL, 0);
}
#endif

static void __init dt_cpus(struct iseries_flat_dt *dt)
{
	unsigned char buf[32];
	unsigned char *p;
	unsigned int i, index;
	struct IoHriProcessorVpd *d;
	u32 pft_size[2];

	/* yuck */
	snprintf(buf, 32, "PowerPC,%s", cur_cpu_spec->cpu_name);
	p = strchr(buf, ' ');
	if (!p) p = buf + strlen(buf);

	dt_start_node(dt, "cpus");
	dt_prop_u32(dt, "#address-cells", 1);
	dt_prop_u32(dt, "#size-cells", 0);

	pft_size[0] = 0; /* NUMA CEC cookie, 0 for non NUMA  */
	pft_size[1] = __ilog2(HvCallHpt_getHptPages() * HW_PAGE_SIZE);

	for (i = 0; i < NR_CPUS; i++) {
		if (lppaca[i].dyn_proc_status >= 2)
			continue;

		snprintf(p, 32 - (p - buf), "@%d", i);
		dt_start_node(dt, buf);

		dt_prop_str(dt, "device_type", device_type_cpu);

		index = lppaca[i].dyn_hv_phys_proc_index;
		d = &xIoHriProcessorVpd[index];

		dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024);
		dt_prop_u32(dt, "i-cache-line-size", d->xInstCacheOperandSize);

		dt_prop_u32(dt, "d-cache-size", d->xDataL1CacheSizeKB * 1024);
		dt_prop_u32(dt, "d-cache-line-size", d->xDataCacheOperandSize);

		/* magic conversions to Hz copied from old code */
		dt_prop_u32(dt, "clock-frequency",
			((1UL << 34) * 1000000) / d->xProcFreq);
		dt_prop_u32(dt, "timebase-frequency",
			((1UL << 32) * 1000000) / d->xTimeBaseFreq);

		dt_prop_u32(dt, "reg", i);

		dt_prop_u32_list(dt, "ibm,pft-size", pft_size, 2);

		dt_end_node(dt);
	}

	dt_end_node(dt);
}

static void __init dt_model(struct iseries_flat_dt *dt)
{
	char buf[16] = "IBM,";

	/* N.B. lparcfg.c knows about the "IBM," prefixes ... */
	/* "IBM," + mfgId[2:3] + systemSerial[1:5] */
	strne2a(buf + 4, xItExtVpdPanel.mfgID + 2, 2);
	strne2a(buf + 6, xItExtVpdPanel.systemSerial + 1, 5);
	buf[11] = '\0';
	dt_prop_str(dt, "system-id", buf);

	/* "IBM," + machineType[0:4] */
	strne2a(buf + 4, xItExtVpdPanel.machineType, 4);
	buf[8] = '\0';
	dt_prop_str(dt, "model", buf);

	dt_prop_str(dt, "compatible", "IBM,iSeries");
	dt_prop_u32(dt, "ibm,partition-no", HvLpConfig_getLpIndex());
}

static void __init dt_do_vdevice(struct iseries_flat_dt *dt,
		const char *name, u32 reg, int unit,
		const char *type, const char *compat, int end)
{
	char buf[32];

	snprintf(buf, 32, "%s@%08x", name, reg + ((unit >= 0) ? unit : 0));
	dt_start_node(dt, buf);
	dt_prop_str(dt, "device_type", type);
	if (compat)
		dt_prop_str(dt, "compatible", compat);
	dt_prop_u32(dt, "reg", reg + ((unit >= 0) ? unit : 0));
	if (unit >= 0)
		dt_prop_u32(dt, "linux,unit_address", unit);
	if (end)
		dt_end_node(dt);
}

static void __init dt_vdevices(struct iseries_flat_dt *dt)
{
	u32 reg = 0;
	HvLpIndexMap vlan_map;
	int i;

	dt_start_node(dt, "vdevice");
	dt_prop_str(dt, "device_type", device_type_vdevice);
	dt_prop_str(dt, "compatible", "IBM,iSeries-vdevice");
	dt_prop_u32(dt, "#address-cells", 1);
	dt_prop_u32(dt, "#size-cells", 0);

	dt_do_vdevice(dt, "vty", reg, -1, device_type_serial,
			"IBM,iSeries-vty", 1);
	reg++;

	dt_do_vdevice(dt, "v-scsi", reg, -1, device_type_vscsi,
			"IBM,v-scsi", 1);
	reg++;

	vlan_map = HvLpConfig_getVirtualLanIndexMap();
	for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
		unsigned char mac_addr[ETH_ALEN];

		if ((vlan_map & (0x8000 >> i)) == 0)
			continue;
		dt_do_vdevice(dt, "l-lan", reg, i, device_type_network,
				"IBM,iSeries-l-lan", 0);
		mac_addr[0] = 0x02;
		mac_addr[1] = 0x01;
		mac_addr[2] = 0xff;
		mac_addr[3] = i;
		mac_addr[4] = 0xff;
		mac_addr[5] = HvLpConfig_getLpIndex_outline();
		dt_prop(dt, "local-mac-address", (char *)mac_addr, ETH_ALEN);
		dt_prop(dt, "mac-address", (char *)mac_addr, ETH_ALEN);
		dt_prop_u32(dt, "max-frame-size", 9000);
		dt_prop_u32(dt, "address-bits", 48);

		dt_end_node(dt);
	}
	reg += HVMAXARCHITECTEDVIRTUALLANS;

	for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++)
		dt_do_vdevice(dt, "viodasd", reg, i, device_type_block,
				"IBM,iSeries-viodasd", 1);
	reg += HVMAXARCHITECTEDVIRTUALDISKS;

	for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++)
		dt_do_vdevice(dt, "viocd", reg, i, device_type_block,
				"IBM,iSeries-viocd", 1);
	reg += HVMAXARCHITECTEDVIRTUALCDROMS;

	for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++)
		dt_do_vdevice(dt, "viotape", reg, i, device_type_byte,
				"IBM,iSeries-viotape", 1);

	dt_end_node(dt);
}

struct pci_class_name {
	u16 code;
	const char *name;
	const char *type;
};

static struct pci_class_name __initdata pci_class_name[] = {
	{ PCI_CLASS_NETWORK_ETHERNET, "ethernet", device_type_network },
};

static struct pci_class_name * __init dt_find_pci_class_name(u16 class_code)
{
	struct pci_class_name *cp;

	for (cp = pci_class_name;
			cp < &pci_class_name[ARRAY_SIZE(pci_class_name)]; cp++)
		if (cp->code == class_code)
			return cp;
	return NULL;
}

/*
 * This assumes that the node slot is always on the primary bus!
 */
static void __init scan_bridge_slot(struct iseries_flat_dt *dt,
		HvBusNumber bus, struct HvCallPci_BridgeInfo *bridge_info)
{
	HvSubBusNumber sub_bus = bridge_info->subBusNumber;
	u16 vendor_id;
	u16 device_id;
	u32 class_id;
	int err;
	char buf[32];
	u32 reg[5];
	int id_sel = ISERIES_GET_DEVICE_FROM_SUBBUS(sub_bus);
	int function = ISERIES_GET_FUNCTION_FROM_SUBBUS(sub_bus);
	HvAgentId eads_id_sel = ISERIES_PCI_AGENTID(id_sel, function);
	u8 devfn;
	struct pci_class_name *cp;

	/*
	 * Connect all functions of any device found.
	 */
	for (id_sel = 1; id_sel <= bridge_info->maxAgents; id_sel++) {
		for (function = 0; function < 8; function++) {
			HvAgentId agent_id = ISERIES_PCI_AGENTID(id_sel,
					function);
			err = HvCallXm_connectBusUnit(bus, sub_bus,
					agent_id, 0);
			if (err) {
				if (err != 0x302)
					DBG("connectBusUnit(%x, %x, %x) %x\n",
						bus, sub_bus, agent_id, err);
				continue;
			}

			err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
					PCI_VENDOR_ID, &vendor_id);
			if (err) {
				DBG("ReadVendor(%x, %x, %x) %x\n",
					bus, sub_bus, agent_id, err);
				continue;
			}
			err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
					PCI_DEVICE_ID, &device_id);
			if (err) {
				DBG("ReadDevice(%x, %x, %x) %x\n",
					bus, sub_bus, agent_id, err);
				continue;
			}
			err = HvCallPci_configLoad32(bus, sub_bus, agent_id,
					PCI_CLASS_REVISION , &class_id);
			if (err) {
				DBG("ReadClass(%x, %x, %x) %x\n",
					bus, sub_bus, agent_id, err);
				continue;
			}

			devfn = PCI_DEVFN(ISERIES_ENCODE_DEVICE(eads_id_sel),
					function);
			cp = dt_find_pci_class_name(class_id >> 16);
			if (cp && cp->name)
				strncpy(buf, cp->name, sizeof(buf) - 1);
			else
				snprintf(buf, sizeof(buf), "pci%x,%x",
						vendor_id, device_id);
			buf[sizeof(buf) - 1] = '\0';
			snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
					"@%x", PCI_SLOT(devfn));
			buf[sizeof(buf) - 1] = '\0';
			if (function != 0)
				snprintf(buf + strlen(buf),
					sizeof(buf) - strlen(buf),
					",%x", function);
			dt_start_node(dt, buf);
			reg[0] = (bus << 16) | (devfn << 8);
			reg[1] = 0;
			reg[2] = 0;
			reg[3] = 0;
			reg[4] = 0;
			dt_prop_u32_list(dt, "reg", reg, 5);
			if (cp && (cp->type || cp->name))
				dt_prop_str(dt, "device_type",
					cp->type ? cp->type : cp->name);
			dt_prop_u32(dt, "vendor-id", vendor_id);
			dt_prop_u32(dt, "device-id", device_id);
			dt_prop_u32(dt, "class-code", class_id >> 8);
			dt_prop_u32(dt, "revision-id", class_id & 0xff);
			dt_prop_u32(dt, "linux,subbus", sub_bus);
			dt_prop_u32(dt, "linux,agent-id", agent_id);
			dt_prop_u32(dt, "linux,logical-slot-number",
					bridge_info->logicalSlotNumber);
			dt_end_node(dt);

		}
	}
}

static void __init scan_bridge(struct iseries_flat_dt *dt, HvBusNumber bus,
		HvSubBusNumber sub_bus, int id_sel)
{
	struct HvCallPci_BridgeInfo bridge_info;
	HvAgentId agent_id;
	int function;
	int ret;

	/* Note: hvSubBus and irq is always be 0 at this level! */
	for (function = 0; function < 8; ++function) {
		agent_id = ISERIES_PCI_AGENTID(id_sel, function);
		ret = HvCallXm_connectBusUnit(bus, sub_bus, agent_id, 0);
		if (ret != 0) {
			if (ret != 0xb)
				DBG("connectBusUnit(%x, %x, %x) %x\n",
						bus, sub_bus, agent_id, ret);
			continue;
		}
		DBG("found device at bus %d idsel %d func %d (AgentId %x)\n",
				bus, id_sel, function, agent_id);
		ret = HvCallPci_getBusUnitInfo(bus, sub_bus, agent_id,
				iseries_hv_addr(&bridge_info),
				sizeof(struct HvCallPci_BridgeInfo));
		if (ret != 0)
			continue;
		DBG("bridge info: type %x subbus %x "
			"maxAgents %x maxsubbus %x logslot %x\n",
			bridge_info.busUnitInfo.deviceType,
			bridge_info.subBusNumber,
			bridge_info.maxAgents,
			bridge_info.maxSubBusNumber,
			bridge_info.logicalSlotNumber);
		if (bridge_info.busUnitInfo.deviceType ==
				HvCallPci_BridgeDevice)
			scan_bridge_slot(dt, bus, &bridge_info);
		else
			DBG("PCI: Invalid Bridge Configuration(0x%02X)",
				bridge_info.busUnitInfo.deviceType);
	}
}

static void __init scan_phb(struct iseries_flat_dt *dt, HvBusNumber bus)
{
	struct HvCallPci_DeviceInfo dev_info;
	const HvSubBusNumber sub_bus = 0;	/* EADs is always 0. */
	int err;
	int id_sel;
	const int max_agents = 8;

	/*
	 * Probe for EADs Bridges
	 */
	for (id_sel = 1; id_sel < max_agents; ++id_sel) {
		err = HvCallPci_getDeviceInfo(bus, sub_bus, id_sel,
				iseries_hv_addr(&dev_info),
				sizeof(struct HvCallPci_DeviceInfo));
		if (err) {
			if (err != 0x302)
				DBG("getDeviceInfo(%x, %x, %x) %x\n",
						bus, sub_bus, id_sel, err);
			continue;
		}
		if (dev_info.deviceType != HvCallPci_NodeDevice) {
			DBG("PCI: Invalid System Configuration"
					"(0x%02X) for bus 0x%02x id 0x%02x.\n",
					dev_info.deviceType, bus, id_sel);
			continue;
		}
		scan_bridge(dt, bus, sub_bus, id_sel);
	}
}

static void __init dt_pci_devices(struct iseries_flat_dt *dt)
{
	HvBusNumber bus;
	char buf[32];
	u32 buses[2];
	int phb_num = 0;

	/* Check all possible buses. */
	for (bus = 0; bus < 256; bus++) {
		int err = HvCallXm_testBus(bus);

		if (err) {
			/*
			 * Check for Unexpected Return code, a clue that
			 * something has gone wrong.
			 */
			if (err != 0x0301)
				DBG("Unexpected Return on Probe(0x%02X) "
						"0x%04X\n", bus, err);
			continue;
		}
		DBG("bus %d appears to exist\n", bus);
		snprintf(buf, 32, "pci@%d", phb_num);
		dt_start_node(dt, buf);
		dt_prop_str(dt, "device_type", device_type_pci);
		dt_prop_str(dt, "compatible", "IBM,iSeries-Logical-PHB");
		dt_prop_u32(dt, "#address-cells", 3);
		dt_prop_u32(dt, "#size-cells", 2);
		buses[0] = buses[1] = bus;
		dt_prop_u32_list(dt, "bus-range", buses, 2);
		scan_phb(dt, bus);
		dt_end_node(dt);
		phb_num++;
	}
}

static void dt_finish(struct iseries_flat_dt *dt)
{
	dt_push_u32(dt, OF_DT_END);
	dt->header.totalsize = (unsigned long)dt_data - (unsigned long)dt;
	klimit = ALIGN((unsigned long)dt_data, 8);
}

void * __init build_flat_dt(unsigned long phys_mem_size)
{
	struct iseries_flat_dt *iseries_dt;
	u64 tmp[2];

	iseries_dt = dt_init();

	dt_start_node(iseries_dt, "");

	dt_prop_u32(iseries_dt, "#address-cells", 2);
	dt_prop_u32(iseries_dt, "#size-cells", 2);
	dt_model(iseries_dt);

	/* /memory */
	dt_start_node(iseries_dt, "memory@0");
	dt_prop_str(iseries_dt, "device_type", device_type_memory);
	tmp[0] = 0;
	tmp[1] = phys_mem_size;
	dt_prop_u64_list(iseries_dt, "reg", tmp, 2);
	dt_end_node(iseries_dt);

	/* /chosen */
	dt_start_node(iseries_dt, "chosen");
	dt_prop_str(iseries_dt, "bootargs", cmd_line);
	dt_end_node(iseries_dt);

	dt_cpus(iseries_dt);

	dt_vdevices(iseries_dt);
	dt_pci_devices(iseries_dt);

	dt_end_node(iseries_dt);

	dt_finish(iseries_dt);

	return iseries_dt;
}