aboutsummaryrefslogtreecommitdiff
path: root/lib/acpi/acpigen.c
blob: c609ef4daa4b87a93b5f1d60f2c8c0bdca79560e (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
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
// SPDX-License-Identifier: GPL-2.0
/*
 * Generation of ACPI (Advanced Configuration and Power Interface) tables
 *
 * Copyright 2019 Google LLC
 * Mostly taken from coreboot
 */

#define LOG_CATEGORY LOGC_ACPI

#include <common.h>
#include <dm.h>
#include <log.h>
#include <uuid.h>
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <acpi/acpi_table.h>
#include <dm/acpi.h>

u8 *acpigen_get_current(struct acpi_ctx *ctx)
{
	return ctx->current;
}

void acpigen_emit_byte(struct acpi_ctx *ctx, uint data)
{
	*(u8 *)ctx->current++ = data;
}

void acpigen_emit_word(struct acpi_ctx *ctx, uint data)
{
	acpigen_emit_byte(ctx, data & 0xff);
	acpigen_emit_byte(ctx, (data >> 8) & 0xff);
}

void acpigen_emit_dword(struct acpi_ctx *ctx, uint data)
{
	/* Output the value in little-endian format */
	acpigen_emit_byte(ctx, data & 0xff);
	acpigen_emit_byte(ctx, (data >> 8) & 0xff);
	acpigen_emit_byte(ctx, (data >> 16) & 0xff);
	acpigen_emit_byte(ctx, (data >> 24) & 0xff);
}

/*
 * Maximum length for an ACPI object generated by this code,
 *
 * If you need to change this, change acpigen_write_len_f(ctx) and
 * acpigen_pop_len(ctx)
 */
#define ACPIGEN_MAXLEN 0xfffff

void acpigen_write_len_f(struct acpi_ctx *ctx)
{
	assert(ctx->ltop < (ACPIGEN_LENSTACK_SIZE - 1));
	ctx->len_stack[ctx->ltop++] = ctx->current;
	acpigen_emit_byte(ctx, 0);
	acpigen_emit_byte(ctx, 0);
	acpigen_emit_byte(ctx, 0);
}

void acpigen_pop_len(struct acpi_ctx *ctx)
{
	int len;
	char *p;

	assert(ctx->ltop > 0);
	p = ctx->len_stack[--ctx->ltop];
	len = ctx->current - (void *)p;
	assert(len <= ACPIGEN_MAXLEN);
	/* generate store length for 0xfffff max */
	p[0] = ACPI_PKG_LEN_3_BYTES | (len & 0xf);
	p[1] = len >> 4 & 0xff;
	p[2] = len >> 12 & 0xff;
}

void acpigen_emit_ext_op(struct acpi_ctx *ctx, uint op)
{
	acpigen_emit_byte(ctx, EXT_OP_PREFIX);
	acpigen_emit_byte(ctx, op);
}

char *acpigen_write_package(struct acpi_ctx *ctx, int nr_el)
{
	char *p;

	acpigen_emit_byte(ctx, PACKAGE_OP);
	acpigen_write_len_f(ctx);
	p = ctx->current;
	acpigen_emit_byte(ctx, nr_el);

	return p;
}

void acpigen_write_byte(struct acpi_ctx *ctx, unsigned int data)
{
	acpigen_emit_byte(ctx, BYTE_PREFIX);
	acpigen_emit_byte(ctx, data & 0xff);
}

void acpigen_write_word(struct acpi_ctx *ctx, unsigned int data)
{
	acpigen_emit_byte(ctx, WORD_PREFIX);
	acpigen_emit_word(ctx, data);
}

void acpigen_write_dword(struct acpi_ctx *ctx, unsigned int data)
{
	acpigen_emit_byte(ctx, DWORD_PREFIX);
	acpigen_emit_dword(ctx, data);
}

void acpigen_write_qword(struct acpi_ctx *ctx, u64 data)
{
	acpigen_emit_byte(ctx, QWORD_PREFIX);
	acpigen_emit_dword(ctx, data & 0xffffffff);
	acpigen_emit_dword(ctx, (data >> 32) & 0xffffffff);
}

void acpigen_write_zero(struct acpi_ctx *ctx)
{
	acpigen_emit_byte(ctx, ZERO_OP);
}

void acpigen_write_one(struct acpi_ctx *ctx)
{
	acpigen_emit_byte(ctx, ONE_OP);
}

void acpigen_write_integer(struct acpi_ctx *ctx, u64 data)
{
	if (data == 0)
		acpigen_write_zero(ctx);
	else if (data == 1)
		acpigen_write_one(ctx);
	else if (data <= 0xff)
		acpigen_write_byte(ctx, (unsigned char)data);
	else if (data <= 0xffff)
		acpigen_write_word(ctx, (unsigned int)data);
	else if (data <= 0xffffffff)
		acpigen_write_dword(ctx, (unsigned int)data);
	else
		acpigen_write_qword(ctx, data);
}

void acpigen_write_name_zero(struct acpi_ctx *ctx, const char *name)
{
	acpigen_write_name(ctx, name);
	acpigen_write_zero(ctx);
}

void acpigen_write_name_one(struct acpi_ctx *ctx, const char *name)
{
	acpigen_write_name(ctx, name);
	acpigen_write_one(ctx);
}

void acpigen_write_name_byte(struct acpi_ctx *ctx, const char *name, uint val)
{
	acpigen_write_name(ctx, name);
	acpigen_write_byte(ctx, val);
}

void acpigen_write_name_word(struct acpi_ctx *ctx, const char *name, uint val)
{
	acpigen_write_name(ctx, name);
	acpigen_write_word(ctx, val);
}

void acpigen_write_name_dword(struct acpi_ctx *ctx, const char *name, uint val)
{
	acpigen_write_name(ctx, name);
	acpigen_write_dword(ctx, val);
}

void acpigen_write_name_qword(struct acpi_ctx *ctx, const char *name, u64 val)
{
	acpigen_write_name(ctx, name);
	acpigen_write_qword(ctx, val);
}

void acpigen_write_name_integer(struct acpi_ctx *ctx, const char *name, u64 val)
{
	acpigen_write_name(ctx, name);
	acpigen_write_integer(ctx, val);
}

void acpigen_write_name_string(struct acpi_ctx *ctx, const char *name,
			       const char *string)
{
	acpigen_write_name(ctx, name);
	acpigen_write_string(ctx, string);
}

void acpigen_emit_stream(struct acpi_ctx *ctx, const char *data, int size)
{
	int i;

	for (i = 0; i < size; i++)
		acpigen_emit_byte(ctx, data[i]);
}

void acpigen_emit_string(struct acpi_ctx *ctx, const char *str)
{
	acpigen_emit_stream(ctx, str, str ? strlen(str) : 0);
	acpigen_emit_byte(ctx, '\0');
}

void acpigen_write_string(struct acpi_ctx *ctx, const char *str)
{
	acpigen_emit_byte(ctx, STRING_PREFIX);
	acpigen_emit_string(ctx, str);
}

/*
 * The naming conventions for ACPI namespace names are a bit tricky as
 * each element has to be 4 chars wide ("All names are a fixed 32 bits.")
 * and "By convention, when an ASL compiler pads a name shorter than 4
 * characters, it is done so with trailing underscores ('_')".
 *
 * Check sections 5.3, 20.2.2 and 20.4 of ACPI spec 6.3 for details.
 */
static void acpigen_emit_simple_namestring(struct acpi_ctx *ctx,
					   const char *name)
{
	const char *ptr;
	int i;

	for (i = 0, ptr = name; i < 4; i++) {
		if (!*ptr || *ptr == '.')
			acpigen_emit_byte(ctx, '_');
		else
			acpigen_emit_byte(ctx, *ptr++);
	}
}

static void acpigen_emit_double_namestring(struct acpi_ctx *ctx,
					   const char *name, int dotpos)
{
	acpigen_emit_byte(ctx, DUAL_NAME_PREFIX);
	acpigen_emit_simple_namestring(ctx, name);
	acpigen_emit_simple_namestring(ctx, &name[dotpos + 1]);
}

static void acpigen_emit_multi_namestring(struct acpi_ctx *ctx,
					  const char *name)
{
	unsigned char *pathlen;
	int count = 0;

	acpigen_emit_byte(ctx, MULTI_NAME_PREFIX);
	pathlen = ctx->current;
	acpigen_emit_byte(ctx, 0);

	while (*name) {
		acpigen_emit_simple_namestring(ctx, name);
		/* find end or next entity */
		while (*name != '.' && *name)
			name++;
		/* forward to next */
		if (*name == '.')
			name++;
		count++;
	}

	*pathlen = count;
}

void acpigen_emit_namestring(struct acpi_ctx *ctx, const char *namepath)
{
	int dotcount;
	int dotpos;
	int i;

	/* We can start with a '\' */
	if (*namepath == '\\') {
		acpigen_emit_byte(ctx, '\\');
		namepath++;
	}

	/* And there can be any number of '^' */
	while (*namepath == '^') {
		acpigen_emit_byte(ctx, '^');
		namepath++;
	}

	for (i = 0, dotcount = 0; namepath[i]; i++) {
		if (namepath[i] == '.') {
			dotcount++;
			dotpos = i;
		}
	}

	/* If we have only \\ or only ^* then we need to add a null name */
	if (!*namepath)
		acpigen_emit_byte(ctx, ZERO_OP);
	else if (dotcount == 0)
		acpigen_emit_simple_namestring(ctx, namepath);
	else if (dotcount == 1)
		acpigen_emit_double_namestring(ctx, namepath, dotpos);
	else
		acpigen_emit_multi_namestring(ctx, namepath);
}

void acpigen_write_name(struct acpi_ctx *ctx, const char *namepath)
{
	acpigen_emit_byte(ctx, NAME_OP);
	acpigen_emit_namestring(ctx, namepath);
}

void acpigen_write_scope(struct acpi_ctx *ctx, const char *scope)
{
	acpigen_emit_byte(ctx, SCOPE_OP);
	acpigen_write_len_f(ctx);
	acpigen_emit_namestring(ctx, scope);
}

static void acpigen_write_method_internal(struct acpi_ctx *ctx,
					  const char *name, uint flags)
{
	acpigen_emit_byte(ctx, METHOD_OP);
	acpigen_write_len_f(ctx);
	acpigen_emit_namestring(ctx, name);
	acpigen_emit_byte(ctx, flags);
}

/* Method (name, nargs, NotSerialized) */
void acpigen_write_method(struct acpi_ctx *ctx, const char *name, int nargs)
{
	acpigen_write_method_internal(ctx, name,
				      nargs & ACPI_METHOD_NARGS_MASK);
}

/* Method (name, nargs, Serialized) */
void acpigen_write_method_serialized(struct acpi_ctx *ctx, const char *name,
				     int nargs)
{
	acpigen_write_method_internal(ctx, name,
				      (nargs & ACPI_METHOD_NARGS_MASK) |
				      ACPI_METHOD_SERIALIZED_MASK);
}

void acpigen_write_device(struct acpi_ctx *ctx, const char *name)
{
	acpigen_emit_ext_op(ctx, DEVICE_OP);
	acpigen_write_len_f(ctx);
	acpigen_emit_namestring(ctx, name);
}

void acpigen_write_sta(struct acpi_ctx *ctx, uint status)
{
	/* Method (_STA, 0, NotSerialized) { Return (status) } */
	acpigen_write_method(ctx, "_STA", 0);
	acpigen_emit_byte(ctx, RETURN_OP);
	acpigen_write_byte(ctx, status);
	acpigen_pop_len(ctx);
}

static void acpigen_write_register(struct acpi_ctx *ctx,
				   const struct acpi_gen_regaddr *addr)
{
	/* See ACPI v6.3 section 6.4.3.7: Generic Register Descriptor */
	acpigen_emit_byte(ctx, ACPI_DESCRIPTOR_REGISTER);
	acpigen_emit_byte(ctx, 0x0c);		/* Register Length 7:0 */
	acpigen_emit_byte(ctx, 0x00);		/* Register Length 15:8 */
	acpigen_emit_byte(ctx, addr->space_id);
	acpigen_emit_byte(ctx, addr->bit_width);
	acpigen_emit_byte(ctx, addr->bit_offset);
	acpigen_emit_byte(ctx, addr->access_size);
	acpigen_emit_dword(ctx, addr->addrl);
	acpigen_emit_dword(ctx, addr->addrh);
}

void acpigen_write_resourcetemplate_header(struct acpi_ctx *ctx)
{
	/*
	 * A ResourceTemplate() is a Buffer() with a
	 * (Byte|Word|DWord) containing the length, followed by one or more
	 * resource items, terminated by the end tag.
	 * (small item 0xf, len 1)
	 */
	acpigen_emit_byte(ctx, BUFFER_OP);
	acpigen_write_len_f(ctx);
	acpigen_emit_byte(ctx, WORD_PREFIX);
	ctx->len_stack[ctx->ltop++] = ctx->current;

	/*
	 * Add two dummy bytes for the ACPI word (keep aligned with the
	 * calculation in acpigen_write_resourcetemplate_footer() below)
	 */
	acpigen_emit_byte(ctx, 0x00);
	acpigen_emit_byte(ctx, 0x00);
}

void acpigen_write_resourcetemplate_footer(struct acpi_ctx *ctx)
{
	char *p = ctx->len_stack[--ctx->ltop];
	int len;
	/*
	 * See ACPI v6.3 section 6.4.2.9: End Tag
	 * 0x79 <checksum>
	 * 0x00 is treated as a good checksum according to the spec
	 * and is what iasl generates.
	 */
	acpigen_emit_byte(ctx, ACPI_END_TAG);
	acpigen_emit_byte(ctx, 0x00);

	/*
	 * Start counting past the 2-bytes length added in
	 * acpigen_write_resourcetemplate_header() above
	 */
	len = (char *)ctx->current - (p + 2);

	/* patch len word */
	p[0] = len & 0xff;
	p[1] = (len >> 8) & 0xff;

	acpigen_pop_len(ctx);
}

void acpigen_write_register_resource(struct acpi_ctx *ctx,
				     const struct acpi_gen_regaddr *addr)
{
	acpigen_write_resourcetemplate_header(ctx);
	acpigen_write_register(ctx, addr);
	acpigen_write_resourcetemplate_footer(ctx);
}

/*
 * ToUUID(uuid)
 *
 * ACPI 6.3 Section 19.6.142 table 19-438 defines a special output order for the
 * bytes that make up a UUID Buffer object:
 *
 * UUID byte order for input to this function:
 *   aabbccdd-eeff-gghh-iijj-kkllmmnnoopp
 *
 * UUID byte order output by this function:
 *   ddccbbaa-ffee-hhgg-iijj-kkllmmnnoopp
 */
int acpigen_write_uuid(struct acpi_ctx *ctx, const char *uuid)
{
	u8 buf[UUID_BIN_LEN];
	int ret;

	/* Parse UUID string into bytes */
	ret = uuid_str_to_bin(uuid, buf, UUID_STR_FORMAT_GUID);
	if (ret)
		return log_msg_ret("bad hex", -EINVAL);

	/* BufferOp */
	acpigen_emit_byte(ctx, BUFFER_OP);
	acpigen_write_len_f(ctx);

	/* Buffer length in bytes */
	acpigen_write_word(ctx, UUID_BIN_LEN);

	/* Output UUID in expected order */
	acpigen_emit_stream(ctx, (char *)buf, UUID_BIN_LEN);

	acpigen_pop_len(ctx);

	return 0;
}

void acpigen_write_power_res(struct acpi_ctx *ctx, const char *name, uint level,
			     uint order, const char *const dev_states[],
			     size_t dev_states_count)
{
	size_t i;

	for (i = 0; i < dev_states_count; i++) {
		acpigen_write_name(ctx, dev_states[i]);
		acpigen_write_package(ctx, 1);
		acpigen_emit_simple_namestring(ctx, name);
		acpigen_pop_len(ctx);		/* Package */
	}

	acpigen_emit_ext_op(ctx, POWER_RES_OP);

	acpigen_write_len_f(ctx);

	acpigen_emit_simple_namestring(ctx, name);
	acpigen_emit_byte(ctx, level);
	acpigen_emit_word(ctx, order);
}

/* Sleep (ms) */
void acpigen_write_sleep(struct acpi_ctx *ctx, u64 sleep_ms)
{
	acpigen_emit_ext_op(ctx, SLEEP_OP);
	acpigen_write_integer(ctx, sleep_ms);
}

void acpigen_write_store(struct acpi_ctx *ctx)
{
	acpigen_emit_byte(ctx, STORE_OP);
}

/* Or (arg1, arg2, res) */
void acpigen_write_or(struct acpi_ctx *ctx, u8 arg1, u8 arg2, u8 res)
{
	acpigen_emit_byte(ctx, OR_OP);
	acpigen_emit_byte(ctx, arg1);
	acpigen_emit_byte(ctx, arg2);
	acpigen_emit_byte(ctx, res);
}

/* And (arg1, arg2, res) */
void acpigen_write_and(struct acpi_ctx *ctx, u8 arg1, u8 arg2, u8 res)
{
	acpigen_emit_byte(ctx, AND_OP);
	acpigen_emit_byte(ctx, arg1);
	acpigen_emit_byte(ctx, arg2);
	acpigen_emit_byte(ctx, res);
}

/* Not (arg, res) */
void acpigen_write_not(struct acpi_ctx *ctx, u8 arg, u8 res)
{
	acpigen_emit_byte(ctx, NOT_OP);
	acpigen_emit_byte(ctx, arg);
	acpigen_emit_byte(ctx, res);
}

/* Store (str, DEBUG) */
void acpigen_write_debug_string(struct acpi_ctx *ctx, const char *str)
{
	acpigen_write_store(ctx);
	acpigen_write_string(ctx, str);
	acpigen_emit_ext_op(ctx, DEBUG_OP);
}

/**
 * acpigen_get_dw0_in_local5() - Generate code to put dw0 cfg0 in local5
 *
 * Store (\_SB.GPC0 (addr), Local5)
 *
 * \_SB.GPC0 is used to read cfg0 value from dw0. It is typically defined in
 * the board's gpiolib.asl
 *
 * The value needs to be stored in a local variable so that it can be used in
 * expressions in the ACPI code.
 *
 * @ctx: ACPI context pointer
 * @dw0_read: Name to use to read dw0, e.g. "\\_SB.GPC0"
 * @addr: GPIO pin configuration register address
 *
 */
static void acpigen_get_dw0_in_local5(struct acpi_ctx *ctx,
				      const char *dw0_read, ulong addr)
{
	acpigen_write_store(ctx);
	acpigen_emit_namestring(ctx, dw0_read);
	acpigen_write_integer(ctx, addr);
	acpigen_emit_byte(ctx, LOCAL5_OP);
}

/**
 * acpigen_set_gpio_val() - Emit code to set value of TX GPIO to on/off
 *
 * @ctx: ACPI context pointer
 * @dw0_read: Method name to use to read dw0, e.g. "\\_SB.GPC0"
 * @dw0_write: Method name to use to read dw0, e.g. "\\_SB.SPC0"
 * @gpio_num: GPIO number to adjust
 * @vaL: true to set on, false to set off
 */
static int acpigen_set_gpio_val(struct acpi_ctx *ctx, u32 tx_state_val,
				const char *dw0_read, const char *dw0_write,
				struct acpi_gpio *gpio, bool val)
{
	acpigen_get_dw0_in_local5(ctx, dw0_read, gpio->pin0_addr);

	/* Store (0x40, Local0) */
	acpigen_write_store(ctx);
	acpigen_write_integer(ctx, tx_state_val);
	acpigen_emit_byte(ctx, LOCAL0_OP);

	if (val) {
		/* Or (Local5, PAD_CFG0_TX_STATE, Local5) */
		acpigen_write_or(ctx, LOCAL5_OP, LOCAL0_OP, LOCAL5_OP);
	} else {
		/* Not (PAD_CFG0_TX_STATE, Local6) */
		acpigen_write_not(ctx, LOCAL0_OP, LOCAL6_OP);

		/* And (Local5, Local6, Local5) */
		acpigen_write_and(ctx, LOCAL5_OP, LOCAL6_OP, LOCAL5_OP);
	}

	/*
	 * \_SB.SPC0 (addr, Local5)
	 * \_SB.SPC0 is used to write cfg0 value in dw0. It is defined in
	 * gpiolib.asl.
	 */
	acpigen_emit_namestring(ctx, dw0_write);
	acpigen_write_integer(ctx, gpio->pin0_addr);
	acpigen_emit_byte(ctx, LOCAL5_OP);

	return 0;
}

int acpigen_set_enable_tx_gpio(struct acpi_ctx *ctx, u32 tx_state_val,
			       const char *dw0_read, const char *dw0_write,
			       struct acpi_gpio *gpio, bool enable)
{
	bool set;
	int ret;

	set = gpio->polarity == ACPI_GPIO_ACTIVE_HIGH ? enable : !enable;
	ret = acpigen_set_gpio_val(ctx, tx_state_val, dw0_read, dw0_write, gpio,
				   set);
	if (ret)
		return log_msg_ret("call", ret);

	return 0;
}