summaryrefslogtreecommitdiff
path: root/src/soc/intel/broadwell/systemagent.c
blob: bfb8b06aa68341d8486e8a235ccf76989d88fd72 (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
/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007-2009 coresystems GmbH
 * Copyright (C) 2014 Google Inc.
 *
 * 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; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <console/console.h>
#include <arch/acpi.h>
#include <arch/io.h>
#include <device/pci_ops.h>
#include <stdint.h>
#include <delay.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdlib.h>
#include <string.h>
#include <vendorcode/google/chromeos/chromeos.h>
#include <soc/cpu.h>
#include <soc/iomap.h>
#include <soc/pci_devs.h>
#include <soc/ramstage.h>
#include <soc/systemagent.h>

u8 systemagent_revision(void)
{
	return pci_read_config8(SA_DEV_ROOT, PCI_REVISION_ID);
}

uintptr_t sa_get_tolud_base(void)
{
	/* Bit 0 is lock bit, not part of address */
	return pci_read_config32(SA_DEV_ROOT, TOLUD) & ~1;
}

uintptr_t sa_get_gsm_base(void)
{
	/* Bit 0 is lock bit, not part of address */
	return pci_read_config32(SA_DEV_ROOT, BGSM) & ~1;
}

static int get_pcie_bar(struct device *dev, unsigned int index, u32 *base,
			u32 *len)
{
	u32 pciexbar_reg;

	*base = 0;
	*len = 0;

	pciexbar_reg = pci_read_config32(dev, index);

	if (!(pciexbar_reg & (1 << 0)))
		return 0;

	switch ((pciexbar_reg >> 1) & 3) {
	case 0: // 256MB
		*base = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|
					(1 << 28));
		*len = 256 * 1024 * 1024;
		return 1;
	case 1: // 128M
		*base = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|
					(1 << 28)|(1 << 27));
		*len = 128 * 1024 * 1024;
		return 1;
	case 2: // 64M
		*base = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|
					(1 << 28)|(1 << 27)|(1 << 26));
		*len = 64 * 1024 * 1024;
		return 1;
	}

	return 0;
}

static int get_bar(struct device *dev, unsigned int index, u32 *base, u32 *len)
{
	u32 bar;

	bar = pci_read_config32(dev, index);

	/* If not enabled don't report it. */
	if (!(bar & 0x1))
		return 0;

	/* Knock down the enable bit. */
	*base = bar & ~1;

	return 1;
}

/* There are special BARs that actually are programmed in the MCHBAR. These
 * Intel special features, but they do consume resources that need to be
 * accounted for. */
static int get_bar_in_mchbar(struct device *dev, unsigned int index, u32 *base,
			     u32 *len)
{
	u32 bar;

	bar = MCHBAR32(index);

	/* If not enabled don't report it. */
	if (!(bar & 0x1))
		return 0;

	/* Knock down the enable bit. */
	*base = bar & ~1;

	return 1;
}

struct fixed_mmio_descriptor {
	unsigned int index;
	u32 size;
	int (*get_resource)(struct device *dev, unsigned int index,
			    u32 *base, u32 *size);
	const char *description;
};

struct fixed_mmio_descriptor mc_fixed_resources[] = {
	{ PCIEXBAR, 0,               get_pcie_bar,      "PCIEXBAR" },
	{ MCHBAR,   MCH_BASE_SIZE,   get_bar,           "MCHBAR"   },
	{ DMIBAR,   DMI_BASE_SIZE,   get_bar,           "DMIBAR"   },
	{ EPBAR,    EP_BASE_SIZE,    get_bar,           "EPBAR"    },
	{ GDXCBAR,  GDXC_BASE_SIZE,  get_bar_in_mchbar, "GDXCBAR"  },
	{ EDRAMBAR, EDRAM_BASE_SIZE, get_bar_in_mchbar, "EDRAMBAR" },
};

/*
 * Add all known fixed MMIO ranges that hang off the host bridge/memory
 * controller device.
 */
static void mc_add_fixed_mmio_resources(struct device *dev)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(mc_fixed_resources); i++) {
		u32 base;
		u32 size;
		struct resource *resource;
		unsigned int index;

		size = mc_fixed_resources[i].size;
		index = mc_fixed_resources[i].index;
		if (!mc_fixed_resources[i].get_resource(dev, index,
							&base, &size))
			continue;

		resource = new_resource(dev, mc_fixed_resources[i].index);
		resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED |
				  IORESOURCE_STORED | IORESOURCE_RESERVE |
				  IORESOURCE_ASSIGNED;
		resource->base = base;
		resource->size = size;
		printk(BIOS_DEBUG, "%s: Adding %s @ %x 0x%08lx-0x%08lx.\n",
		       __func__, mc_fixed_resources[i].description, index,
		       (unsigned long)base, (unsigned long)(base + size - 1));
	}
}

/* Host Memory Map:
 *
 * +--------------------------+ TOUUD
 * |                          |
 * +--------------------------+ 4GiB
 * |     PCI Address Space    |
 * +--------------------------+ TOLUD (also maps into MC address space)
 * |     iGD                  |
 * +--------------------------+ BDSM
 * |     GTT                  |
 * +--------------------------+ BGSM
 * |     TSEG                 |
 * +--------------------------+ TSEGMB
 * |     Usage DRAM           |
 * +--------------------------+ 0
 *
 * Some of the base registers above can be equal making the size of those
 * regions 0. The reason is because the memory controller internally subtracts
 * the base registers from each other to determine sizes of the regions. In
 * other words, the memory map is in a fixed order no matter what.
 */

struct map_entry {
	int reg;
	int is_64_bit;
	int is_limit;
	const char *description;
};

static void read_map_entry(struct device *dev, struct map_entry *entry,
			   uint64_t *result)
{
	uint64_t value;
	uint64_t mask;

	/* All registers are on a 1MiB granularity. */
	mask = ((1ULL<<20)-1);
	mask = ~mask;

	value = 0;

	if (entry->is_64_bit) {
		value = pci_read_config32(dev, entry->reg + 4);
		value <<= 32;
	}

	value |= pci_read_config32(dev, entry->reg);
	value &= mask;

	if (entry->is_limit)
		value |= ~mask;

	*result = value;
}

#define MAP_ENTRY(reg_, is_64_, is_limit_, desc_) \
	{ \
		.reg = reg_,           \
		.is_64_bit = is_64_,   \
		.is_limit = is_limit_, \
		.description = desc_,  \
	}

#define MAP_ENTRY_BASE_64(reg_, desc_) \
	MAP_ENTRY(reg_, 1, 0, desc_)
#define MAP_ENTRY_LIMIT_64(reg_, desc_) \
	MAP_ENTRY(reg_, 1, 1, desc_)
#define MAP_ENTRY_BASE_32(reg_, desc_) \
	MAP_ENTRY(reg_, 0, 0, desc_)

enum {
	TOM_REG,
	TOUUD_REG,
	MESEG_BASE_REG,
	MESEG_LIMIT_REG,
	REMAP_BASE_REG,
	REMAP_LIMIT_REG,
	TOLUD_REG,
	BGSM_REG,
	BDSM_REG,
	TSEG_REG,
	// Must be last.
	NUM_MAP_ENTRIES
};

static struct map_entry memory_map[NUM_MAP_ENTRIES] = {
	[TOM_REG] = MAP_ENTRY_BASE_64(TOM, "TOM"),
	[TOUUD_REG] = MAP_ENTRY_BASE_64(TOUUD, "TOUUD"),
	[MESEG_BASE_REG] = MAP_ENTRY_BASE_64(MESEG_BASE, "MESEG_BASE"),
	[MESEG_LIMIT_REG] = MAP_ENTRY_LIMIT_64(MESEG_LIMIT, "MESEG_LIMIT"),
	[REMAP_BASE_REG] = MAP_ENTRY_BASE_64(REMAPBASE, "REMAP_BASE"),
	[REMAP_LIMIT_REG] = MAP_ENTRY_LIMIT_64(REMAPLIMIT, "REMAP_LIMIT"),
	[TOLUD_REG] = MAP_ENTRY_BASE_32(TOLUD, "TOLUD"),
	[BDSM_REG] = MAP_ENTRY_BASE_32(BDSM, "BDSM"),
	[BGSM_REG] = MAP_ENTRY_BASE_32(BGSM, "BGSM"),
	[TSEG_REG] = MAP_ENTRY_BASE_32(TSEG, "TESGMB"),
};

static void mc_read_map_entries(struct device *dev, uint64_t *values)
{
	int i;
	for (i = 0; i < NUM_MAP_ENTRIES; i++)
		read_map_entry(dev, &memory_map[i], &values[i]);
}

static void mc_report_map_entries(struct device *dev, uint64_t *values)
{
	int i;
	for (i = 0; i < NUM_MAP_ENTRIES; i++) {
		printk(BIOS_DEBUG, "MC MAP: %s: 0x%llx\n",
		       memory_map[i].description, values[i]);
	}
	/* One can validate the BDSM and BGSM against the GGC. */
	printk(BIOS_DEBUG, "MC MAP: GGC: 0x%x\n", pci_read_config16(dev, GGC));
}

static void mc_add_dram_resources(struct device *dev, int *resource_cnt)
{
	unsigned long base_k, size_k;
	unsigned long touud_k;
	unsigned long index;
	struct resource *resource;
	uint64_t mc_values[NUM_MAP_ENTRIES];
	unsigned long dpr_size = 0;
	u32 dpr_reg;

	/* Read in the MAP registers and report their values. */
	mc_read_map_entries(dev, &mc_values[0]);
	mc_report_map_entries(dev, &mc_values[0]);

	/*
	 * DMA Protected Range can be reserved below TSEG for PCODE patch
	 * or TXT/BootGuard related data.  Rather than report a base address
	 * the DPR register reports the TOP of the region, which is the same
	 * as TSEG base.  The region size is reported in MiB in bits 11:4.
	 */
	dpr_reg = pci_read_config32(SA_DEV_ROOT, DPR);
	if (dpr_reg & DPR_EPM) {
		dpr_size = (dpr_reg & DPR_SIZE_MASK) << 16;
		printk(BIOS_INFO, "DPR SIZE: 0x%lx\n", dpr_size);
	}

	/*
	 * These are the host memory ranges that should be added:
	 * - 0 -> 0xa0000: cacheable
	 * - 0xc0000 -> TSEG : cacheable
	 * - TESG -> BGSM: cacheable with standard MTRRs and reserved
	 * - BGSM -> TOLUD: not cacheable with standard MTRRs and reserved
	 * - 4GiB -> TOUUD: cacheable
	 *
	 * The default SMRAM space is reserved so that the range doesn't
	 * have to be saved during S3 Resume. Once marked reserved the OS
	 * cannot use the memory. This is a bit of an odd place to reserve
	 * the region, but the CPU devices don't have dev_ops->read_resources()
	 * called on them.
	 *
	 * The range 0xa0000 -> 0xc0000 does not have any resources
	 * associated with it to handle legacy VGA memory. If this range
	 * is not omitted the mtrr code will setup the area as cacheable
	 * causing VGA access to not work.
	 *
	 * The TSEG region is mapped as cacheable so that one can perform
	 * SMRAM relocation faster. Once the SMRR is enabled the SMRR takes
	 * precedence over the existing MTRRs covering this region.
	 *
	 * It should be noted that cacheable entry types need to be added in
	 * order. The reason is that the current MTRR code assumes this and
	 * falls over itself if it isn't.
	 *
	 * The resource index starts low and should not meet or exceed
	 * PCI_BASE_ADDRESS_0.
	 */
	index = *resource_cnt;

	/* 0 - > 0xa0000 */
	base_k = 0;
	size_k = (0xa0000 >> 10) - base_k;
	ram_resource(dev, index++, base_k, size_k);

	/* 0xc0000 -> TSEG - DPR */
	base_k = 0xc0000 >> 10;
	size_k = (unsigned long)(mc_values[TSEG_REG] >> 10) - base_k;
	size_k -= dpr_size >> 10;
	ram_resource(dev, index++, base_k, size_k);

	/* TSEG - DPR -> BGSM */
	resource = new_resource(dev, index++);
	resource->base = mc_values[TSEG_REG] - dpr_size;
	resource->size = mc_values[BGSM_REG] - resource->base;
	resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED |
			  IORESOURCE_STORED | IORESOURCE_RESERVE |
			  IORESOURCE_ASSIGNED | IORESOURCE_CACHEABLE;

	/* BGSM -> TOLUD */
	resource = new_resource(dev, index++);
	resource->base = mc_values[BGSM_REG];
	resource->size = mc_values[TOLUD_REG] - resource->base;
	resource->flags = IORESOURCE_MEM | IORESOURCE_FIXED |
			  IORESOURCE_STORED | IORESOURCE_RESERVE |
			  IORESOURCE_ASSIGNED;

	/* 4GiB -> TOUUD */
	base_k = 4096 * 1024; /* 4GiB */
	touud_k = mc_values[TOUUD_REG] >> 10;
	size_k = touud_k - base_k;
	if (touud_k > base_k)
		ram_resource(dev, index++, base_k, size_k);

	/* Reserve everything between A segment and 1MB:
	 *
	 * 0xa0000 - 0xbffff: legacy VGA
	 * 0xc0000 - 0xfffff: RAM
	 */
	mmio_resource(dev, index++, (0xa0000 >> 10), (0xc0000 - 0xa0000) >> 10);
	reserved_ram_resource(dev, index++, (0xc0000 >> 10),
				(0x100000 - 0xc0000) >> 10);

	if (IS_ENABLED(CONFIG_CHROMEOS))
		chromeos_reserve_ram_oops(dev, index++);

	*resource_cnt = index;
}

static void systemagent_read_resources(struct device *dev)
{
	int index = 0;
	const bool vtd_capable =
		!(pci_read_config32(dev, CAPID0_A) & VTD_DISABLE);

	/* Read standard PCI resources. */
	pci_dev_read_resources(dev);

	/* Add all fixed MMIO resources. */
	mc_add_fixed_mmio_resources(dev);

	/* Add VT-d MMIO resources if capable */
	if (vtd_capable) {
		mmio_resource(dev, index++, GFXVT_BASE_ADDRESS / KiB,
			GFXVT_BASE_SIZE / KiB);
		mmio_resource(dev, index++, VTVC0_BASE_ADDRESS / KiB,
			VTVC0_BASE_SIZE / KiB);
	}

	/* Calculate and add DRAM resources. */
	mc_add_dram_resources(dev, &index);
}

static void systemagent_init(struct device *dev)
{
	u8 bios_reset_cpl, pair;

	/* Enable Power Aware Interrupt Routing */
	pair = MCHBAR8(MCH_PAIR);
	pair &= ~0x7;	/* Clear 2:0 */
	pair |= 0x4;	/* Fixed Priority */
	MCHBAR8(MCH_PAIR) = pair;

	/*
	 * Set bits 0+1 of BIOS_RESET_CPL to indicate to the CPU
	 * that BIOS has initialized memory and power management
	 */
	bios_reset_cpl = MCHBAR8(BIOS_RESET_CPL);
	bios_reset_cpl |= 3;
	MCHBAR8(BIOS_RESET_CPL) = bios_reset_cpl;
	printk(BIOS_DEBUG, "Set BIOS_RESET_CPL\n");

	/* Configure turbo power limits 1ms after reset complete bit */
	mdelay(1);
	set_power_limits(28);
}

static struct device_operations systemagent_ops = {
	.read_resources   = systemagent_read_resources,
	.acpi_fill_ssdt_generator = generate_cpu_entries,
	.set_resources    = pci_dev_set_resources,
	.enable_resources = pci_dev_enable_resources,
	.init             = systemagent_init,
	.ops_pci          = &broadwell_pci_ops,
};

static const unsigned short systemagent_ids[] = {
	0x0a04, /* Haswell ULT */
	0x1604, /* Broadwell-U/Y */
	0x1610, /* Broadwell-H Desktop */
	0x1614, /* Broadwell-H Mobile */
	0
};

static const struct pci_driver systemagent_driver __pci_driver = {
	.ops     = &systemagent_ops,
	.vendor  = PCI_VENDOR_ID_INTEL,
	.devices = systemagent_ids
};