xref: /openbmc/u-boot/arch/x86/cpu/ivybridge/lpc.c (revision 00a457b2)
1 /*
2  * From coreboot southbridge/intel/bd82x6x/lpc.c
3  *
4  * Copyright (C) 2008-2009 coresystems GmbH
5  *
6  * SPDX-License-Identifier:	GPL-2.0
7  */
8 
9 #include <common.h>
10 #include <dm.h>
11 #include <errno.h>
12 #include <fdtdec.h>
13 #include <rtc.h>
14 #include <pci.h>
15 #include <asm/acpi.h>
16 #include <asm/interrupt.h>
17 #include <asm/io.h>
18 #include <asm/ioapic.h>
19 #include <asm/pci.h>
20 #include <asm/arch/pch.h>
21 
22 #define NMI_OFF				0
23 
24 #define ENABLE_ACPI_MODE_IN_COREBOOT	0
25 #define TEST_SMM_FLASH_LOCKDOWN		0
26 
27 static int pch_enable_apic(pci_dev_t dev)
28 {
29 	u32 reg32;
30 	int i;
31 
32 	/* Enable ACPI I/O and power management. Set SCI IRQ to IRQ9 */
33 	x86_pci_write_config8(dev, ACPI_CNTL, 0x80);
34 
35 	writel(0, IO_APIC_INDEX);
36 	writel(1 << 25, IO_APIC_DATA);
37 
38 	/* affirm full set of redirection table entries ("write once") */
39 	writel(1, IO_APIC_INDEX);
40 	reg32 = readl(IO_APIC_DATA);
41 	writel(1, IO_APIC_INDEX);
42 	writel(reg32, IO_APIC_DATA);
43 
44 	writel(0, IO_APIC_INDEX);
45 	reg32 = readl(IO_APIC_DATA);
46 	debug("PCH APIC ID = %x\n", (reg32 >> 24) & 0x0f);
47 	if (reg32 != (1 << 25)) {
48 		printf("APIC Error - cannot write to registers\n");
49 		return -EPERM;
50 	}
51 
52 	debug("Dumping IOAPIC registers\n");
53 	for (i = 0;  i < 3; i++) {
54 		writel(i, IO_APIC_INDEX);
55 		debug("  reg 0x%04x:", i);
56 		reg32 = readl(IO_APIC_DATA);
57 		debug(" 0x%08x\n", reg32);
58 	}
59 
60 	/* Select Boot Configuration register. */
61 	writel(3, IO_APIC_INDEX);
62 
63 	/* Use Processor System Bus to deliver interrupts. */
64 	writel(1, IO_APIC_DATA);
65 
66 	return 0;
67 }
68 
69 static void pch_enable_serial_irqs(pci_dev_t dev)
70 {
71 	u32 value;
72 
73 	/* Set packet length and toggle silent mode bit for one frame. */
74 	value = (1 << 7) | (1 << 6) | ((21 - 17) << 2) | (0 << 0);
75 #ifdef CONFIG_SERIRQ_CONTINUOUS_MODE
76 	x86_pci_write_config8(dev, SERIRQ_CNTL, value);
77 #else
78 	x86_pci_write_config8(dev, SERIRQ_CNTL, value | (1 << 6));
79 #endif
80 }
81 
82 static int pch_pirq_init(const void *blob, int node, pci_dev_t dev)
83 {
84 	uint8_t route[8], *ptr;
85 
86 	if (fdtdec_get_byte_array(blob, node, "intel,pirq-routing", route,
87 				  sizeof(route)))
88 		return -EINVAL;
89 	ptr = route;
90 	x86_pci_write_config8(dev, PIRQA_ROUT, *ptr++);
91 	x86_pci_write_config8(dev, PIRQB_ROUT, *ptr++);
92 	x86_pci_write_config8(dev, PIRQC_ROUT, *ptr++);
93 	x86_pci_write_config8(dev, PIRQD_ROUT, *ptr++);
94 
95 	x86_pci_write_config8(dev, PIRQE_ROUT, *ptr++);
96 	x86_pci_write_config8(dev, PIRQF_ROUT, *ptr++);
97 	x86_pci_write_config8(dev, PIRQG_ROUT, *ptr++);
98 	x86_pci_write_config8(dev, PIRQH_ROUT, *ptr++);
99 
100 	/*
101 	 * TODO(sjg@chromium.org): U-Boot does not set up the interrupts
102 	 * here. It's unclear if it is needed
103 	 */
104 	return 0;
105 }
106 
107 static int pch_gpi_routing(const void *blob, int node, pci_dev_t dev)
108 {
109 	u8 route[16];
110 	u32 reg;
111 	int gpi;
112 
113 	if (fdtdec_get_byte_array(blob, node, "intel,gpi-routing", route,
114 				  sizeof(route)))
115 		return -EINVAL;
116 
117 	for (reg = 0, gpi = 0; gpi < ARRAY_SIZE(route); gpi++)
118 		reg |= route[gpi] << (gpi * 2);
119 
120 	x86_pci_write_config32(dev, 0xb8, reg);
121 
122 	return 0;
123 }
124 
125 static int pch_power_options(const void *blob, int node, pci_dev_t dev)
126 {
127 	u8 reg8;
128 	u16 reg16, pmbase;
129 	u32 reg32;
130 	const char *state;
131 	int pwr_on;
132 	int nmi_option;
133 	int ret;
134 
135 	/*
136 	 * Which state do we want to goto after g3 (power restored)?
137 	 * 0 == S0 Full On
138 	 * 1 == S5 Soft Off
139 	 *
140 	 * If the option is not existent (Laptops), use Kconfig setting.
141 	 * TODO(sjg@chromium.org): Make this configurable
142 	 */
143 	pwr_on = MAINBOARD_POWER_ON;
144 
145 	reg16 = x86_pci_read_config16(dev, GEN_PMCON_3);
146 	reg16 &= 0xfffe;
147 	switch (pwr_on) {
148 	case MAINBOARD_POWER_OFF:
149 		reg16 |= 1;
150 		state = "off";
151 		break;
152 	case MAINBOARD_POWER_ON:
153 		reg16 &= ~1;
154 		state = "on";
155 		break;
156 	case MAINBOARD_POWER_KEEP:
157 		reg16 &= ~1;
158 		state = "state keep";
159 		break;
160 	default:
161 		state = "undefined";
162 	}
163 
164 	reg16 &= ~(3 << 4);	/* SLP_S4# Assertion Stretch 4s */
165 	reg16 |= (1 << 3);	/* SLP_S4# Assertion Stretch Enable */
166 
167 	reg16 &= ~(1 << 10);
168 	reg16 |= (1 << 11);	/* SLP_S3# Min Assertion Width 50ms */
169 
170 	reg16 |= (1 << 12);	/* Disable SLP stretch after SUS well */
171 
172 	x86_pci_write_config16(dev, GEN_PMCON_3, reg16);
173 	debug("Set power %s after power failure.\n", state);
174 
175 	/* Set up NMI on errors. */
176 	reg8 = inb(0x61);
177 	reg8 &= 0x0f;		/* Higher Nibble must be 0 */
178 	reg8 &= ~(1 << 3);	/* IOCHK# NMI Enable */
179 	reg8 |= (1 << 2); /* PCI SERR# Disable for now */
180 	outb(reg8, 0x61);
181 
182 	reg8 = inb(0x70);
183 	/* TODO(sjg@chromium.org): Make this configurable */
184 	nmi_option = NMI_OFF;
185 	if (nmi_option) {
186 		debug("NMI sources enabled.\n");
187 		reg8 &= ~(1 << 7);	/* Set NMI. */
188 	} else {
189 		debug("NMI sources disabled.\n");
190 		/* Can't mask NMI from PCI-E and NMI_NOW */
191 		reg8 |= (1 << 7);
192 	}
193 	outb(reg8, 0x70);
194 
195 	/* Enable CPU_SLP# and Intel Speedstep, set SMI# rate down */
196 	reg16 = x86_pci_read_config16(dev, GEN_PMCON_1);
197 	reg16 &= ~(3 << 0);	/* SMI# rate 1 minute */
198 	reg16 &= ~(1 << 10);	/* Disable BIOS_PCI_EXP_EN for native PME */
199 #if DEBUG_PERIODIC_SMIS
200 	/* Set DEBUG_PERIODIC_SMIS in pch.h to debug using periodic SMIs */
201 	reg16 |= (3 << 0);	/* Periodic SMI every 8s */
202 #endif
203 	x86_pci_write_config16(dev, GEN_PMCON_1, reg16);
204 
205 	/* Set the board's GPI routing. */
206 	ret = pch_gpi_routing(blob, node, dev);
207 	if (ret)
208 		return ret;
209 
210 	pmbase = x86_pci_read_config16(dev, 0x40) & 0xfffe;
211 
212 	writel(pmbase + GPE0_EN, fdtdec_get_int(blob, node,
213 						"intel,gpe0-enable", 0));
214 	writew(pmbase + ALT_GP_SMI_EN, fdtdec_get_int(blob, node,
215 						"intel,alt-gp-smi-enable", 0));
216 
217 	/* Set up power management block and determine sleep mode */
218 	reg32 = inl(pmbase + 0x04); /* PM1_CNT */
219 	reg32 &= ~(7 << 10);	/* SLP_TYP */
220 	reg32 |= (1 << 0);	/* SCI_EN */
221 	outl(reg32, pmbase + 0x04);
222 
223 	/* Clear magic status bits to prevent unexpected wake */
224 	setbits_le32(RCB_REG(0x3310), (1 << 4) | (1 << 5) | (1 << 0));
225 	clrbits_le32(RCB_REG(0x3f02), 0xf);
226 
227 	return 0;
228 }
229 
230 static void pch_rtc_init(pci_dev_t dev)
231 {
232 	int rtc_failed;
233 	u8 reg8;
234 
235 	reg8 = x86_pci_read_config8(dev, GEN_PMCON_3);
236 	rtc_failed = reg8 & RTC_BATTERY_DEAD;
237 	if (rtc_failed) {
238 		reg8 &= ~RTC_BATTERY_DEAD;
239 		x86_pci_write_config8(dev, GEN_PMCON_3, reg8);
240 	}
241 	debug("rtc_failed = 0x%x\n", rtc_failed);
242 
243 	/* TODO: Handle power failure */
244 	if (rtc_failed)
245 		printf("RTC power failed\n");
246 }
247 
248 /* CougarPoint PCH Power Management init */
249 static void cpt_pm_init(pci_dev_t dev)
250 {
251 	debug("CougarPoint PM init\n");
252 	x86_pci_write_config8(dev, 0xa9, 0x47);
253 	setbits_le32(RCB_REG(0x2238), (1 << 6) | (1 << 0));
254 
255 	setbits_le32(RCB_REG(0x228c), 1 << 0);
256 	setbits_le32(RCB_REG(0x1100), (1 << 13) | (1 << 14));
257 	setbits_le32(RCB_REG(0x0900), 1 << 14);
258 	writel(0xc0388400, RCB_REG(0x2304));
259 	setbits_le32(RCB_REG(0x2314), (1 << 5) | (1 << 18));
260 	setbits_le32(RCB_REG(0x2320), (1 << 15) | (1 << 1));
261 	clrsetbits_le32(RCB_REG(0x3314), ~0x1f, 0xf);
262 	writel(0x050f0000, RCB_REG(0x3318));
263 	writel(0x04000000, RCB_REG(0x3324));
264 	setbits_le32(RCB_REG(0x3340), 0xfffff);
265 	setbits_le32(RCB_REG(0x3344), 1 << 1);
266 
267 	writel(0x0001c000, RCB_REG(0x3360));
268 	writel(0x00061100, RCB_REG(0x3368));
269 	writel(0x7f8fdfff, RCB_REG(0x3378));
270 	writel(0x000003fc, RCB_REG(0x337c));
271 	writel(0x00001000, RCB_REG(0x3388));
272 	writel(0x0001c000, RCB_REG(0x3390));
273 	writel(0x00000800, RCB_REG(0x33a0));
274 	writel(0x00001000, RCB_REG(0x33b0));
275 	writel(0x00093900, RCB_REG(0x33c0));
276 	writel(0x24653002, RCB_REG(0x33cc));
277 	writel(0x062108fe, RCB_REG(0x33d0));
278 	clrsetbits_le32(RCB_REG(0x33d4), 0x0fff0fff, 0x00670060);
279 	writel(0x01010000, RCB_REG(0x3a28));
280 	writel(0x01010404, RCB_REG(0x3a2c));
281 	writel(0x01041041, RCB_REG(0x3a80));
282 	clrsetbits_le32(RCB_REG(0x3a84), 0x0000ffff, 0x00001001);
283 	setbits_le32(RCB_REG(0x3a84), 1 << 24); /* SATA 2/3 disabled */
284 	setbits_le32(RCB_REG(0x3a88), 1 << 0);  /* SATA 4/5 disabled */
285 	writel(0x00000001, RCB_REG(0x3a6c));
286 	clrsetbits_le32(RCB_REG(0x2344), ~0x00ffff00, 0xff00000c);
287 	clrsetbits_le32(RCB_REG(0x80c), 0xff << 20, 0x11 << 20);
288 	writel(0, RCB_REG(0x33c8));
289 	setbits_le32(RCB_REG(0x21b0), 0xf);
290 }
291 
292 /* PantherPoint PCH Power Management init */
293 static void ppt_pm_init(pci_dev_t dev)
294 {
295 	debug("PantherPoint PM init\n");
296 	x86_pci_write_config8(dev, 0xa9, 0x47);
297 	setbits_le32(RCB_REG(0x2238), 1 << 0);
298 	setbits_le32(RCB_REG(0x228c), 1 << 0);
299 	setbits_le16(RCB_REG(0x1100), (1 << 13) | (1 << 14));
300 	setbits_le16(RCB_REG(0x0900), 1 << 14);
301 	writel(0xc03b8400, RCB_REG(0x2304));
302 	setbits_le32(RCB_REG(0x2314), (1 << 5) | (1 << 18));
303 	setbits_le32(RCB_REG(0x2320), (1 << 15) | (1 << 1));
304 	clrsetbits_le32(RCB_REG(0x3314), 0x1f, 0xf);
305 	writel(0x054f0000, RCB_REG(0x3318));
306 	writel(0x04000000, RCB_REG(0x3324));
307 	setbits_le32(RCB_REG(0x3340), 0xfffff);
308 	setbits_le32(RCB_REG(0x3344), (1 << 1) | (1 << 0));
309 	writel(0x0001c000, RCB_REG(0x3360));
310 	writel(0x00061100, RCB_REG(0x3368));
311 	writel(0x7f8fdfff, RCB_REG(0x3378));
312 	writel(0x000003fd, RCB_REG(0x337c));
313 	writel(0x00001000, RCB_REG(0x3388));
314 	writel(0x0001c000, RCB_REG(0x3390));
315 	writel(0x00000800, RCB_REG(0x33a0));
316 	writel(0x00001000, RCB_REG(0x33b0));
317 	writel(0x00093900, RCB_REG(0x33c0));
318 	writel(0x24653002, RCB_REG(0x33cc));
319 	writel(0x067388fe, RCB_REG(0x33d0));
320 	clrsetbits_le32(RCB_REG(0x33d4), 0x0fff0fff, 0x00670060);
321 	writel(0x01010000, RCB_REG(0x3a28));
322 	writel(0x01010404, RCB_REG(0x3a2c));
323 	writel(0x01040000, RCB_REG(0x3a80));
324 	clrsetbits_le32(RCB_REG(0x3a84), 0x0000ffff, 0x00001001);
325 	/* SATA 2/3 disabled */
326 	setbits_le32(RCB_REG(0x3a84), 1 << 24);
327 	/* SATA 4/5 disabled */
328 	setbits_le32(RCB_REG(0x3a88), 1 << 0);
329 	writel(0x00000001, RCB_REG(0x3a6c));
330 	clrsetbits_le32(RCB_REG(0x2344), 0xff0000ff, 0xff00000c);
331 	clrsetbits_le32(RCB_REG(0x80c), 0xff << 20, 0x11 << 20);
332 	setbits_le32(RCB_REG(0x33a4), (1 << 0));
333 	writel(0, RCB_REG(0x33c8));
334 	setbits_le32(RCB_REG(0x21b0), 0xf);
335 }
336 
337 static void enable_hpet(void)
338 {
339 	/* Move HPET to default address 0xfed00000 and enable it */
340 	clrsetbits_le32(RCB_REG(HPTC), 3 << 0, 1 << 7);
341 }
342 
343 static void enable_clock_gating(pci_dev_t dev)
344 {
345 	u32 reg32;
346 	u16 reg16;
347 
348 	setbits_le32(RCB_REG(0x2234), 0xf);
349 
350 	reg16 = x86_pci_read_config16(dev, GEN_PMCON_1);
351 	reg16 |= (1 << 2) | (1 << 11);
352 	x86_pci_write_config16(dev, GEN_PMCON_1, reg16);
353 
354 	pch_iobp_update(0xEB007F07, ~0UL, (1 << 31));
355 	pch_iobp_update(0xEB004000, ~0UL, (1 << 7));
356 	pch_iobp_update(0xEC007F07, ~0UL, (1 << 31));
357 	pch_iobp_update(0xEC004000, ~0UL, (1 << 7));
358 
359 	reg32 = readl(RCB_REG(CG));
360 	reg32 |= (1 << 31);
361 	reg32 |= (1 << 29) | (1 << 28);
362 	reg32 |= (1 << 27) | (1 << 26) | (1 << 25) | (1 << 24);
363 	reg32 |= (1 << 16);
364 	reg32 |= (1 << 17);
365 	reg32 |= (1 << 18);
366 	reg32 |= (1 << 22);
367 	reg32 |= (1 << 23);
368 	reg32 &= ~(1 << 20);
369 	reg32 |= (1 << 19);
370 	reg32 |= (1 << 0);
371 	reg32 |= (0xf << 1);
372 	writel(reg32, RCB_REG(CG));
373 
374 	setbits_le32(RCB_REG(0x38c0), 0x7);
375 	setbits_le32(RCB_REG(0x36d4), 0x6680c004);
376 	setbits_le32(RCB_REG(0x3564), 0x3);
377 }
378 
379 #if CONFIG_HAVE_SMI_HANDLER
380 static void pch_lock_smm(pci_dev_t dev)
381 {
382 #if TEST_SMM_FLASH_LOCKDOWN
383 	u8 reg8;
384 #endif
385 
386 	if (acpi_slp_type != 3) {
387 #if ENABLE_ACPI_MODE_IN_COREBOOT
388 		debug("Enabling ACPI via APMC:\n");
389 		outb(0xe1, 0xb2); /* Enable ACPI mode */
390 		debug("done.\n");
391 #else
392 		debug("Disabling ACPI via APMC:\n");
393 		outb(0x1e, 0xb2); /* Disable ACPI mode */
394 		debug("done.\n");
395 #endif
396 	}
397 
398 	/* Don't allow evil boot loaders, kernels, or
399 	 * userspace applications to deceive us:
400 	 */
401 	smm_lock();
402 
403 #if TEST_SMM_FLASH_LOCKDOWN
404 	/* Now try this: */
405 	debug("Locking BIOS to RO... ");
406 	reg8 = x86_pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
407 	debug(" BLE: %s; BWE: %s\n", (reg8 & 2) ? "on" : "off",
408 	      (reg8 & 1) ? "rw" : "ro");
409 	reg8 &= ~(1 << 0);			/* clear BIOSWE */
410 	x86_pci_write_config8(dev, 0xdc, reg8);
411 	reg8 |= (1 << 1);			/* set BLE */
412 	x86_pci_write_config8(dev, 0xdc, reg8);
413 	debug("ok.\n");
414 	reg8 = x86_pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
415 	debug(" BLE: %s; BWE: %s\n", (reg8 & 2) ? "on" : "off",
416 	      (reg8 & 1) ? "rw" : "ro");
417 
418 	debug("Writing:\n");
419 	writeb(0, 0xfff00000);
420 	debug("Testing:\n");
421 	reg8 |= (1 << 0);			/* set BIOSWE */
422 	x86_pci_write_config8(dev, 0xdc, reg8);
423 
424 	reg8 = x86_pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
425 	debug(" BLE: %s; BWE: %s\n", (reg8 & 2) ? "on" : "off",
426 	      (reg8 & 1) ? "rw" : "ro");
427 	debug("Done.\n");
428 #endif
429 }
430 #endif
431 
432 static void pch_disable_smm_only_flashing(pci_dev_t dev)
433 {
434 	u8 reg8;
435 
436 	debug("Enabling BIOS updates outside of SMM... ");
437 	reg8 = x86_pci_read_config8(dev, 0xdc);	/* BIOS_CNTL */
438 	reg8 &= ~(1 << 5);
439 	x86_pci_write_config8(dev, 0xdc, reg8);
440 }
441 
442 static void pch_fixups(pci_dev_t dev)
443 {
444 	u8 gen_pmcon_2;
445 
446 	/* Indicate DRAM init done for MRC S3 to know it can resume */
447 	gen_pmcon_2 = x86_pci_read_config8(dev, GEN_PMCON_2);
448 	gen_pmcon_2 |= (1 << 7);
449 	x86_pci_write_config8(dev, GEN_PMCON_2, gen_pmcon_2);
450 
451 	/* Enable DMI ASPM in the PCH */
452 	clrbits_le32(RCB_REG(0x2304), 1 << 10);
453 	setbits_le32(RCB_REG(0x21a4), (1 << 11) | (1 << 10));
454 	setbits_le32(RCB_REG(0x21a8), 0x3);
455 }
456 
457 int lpc_early_init(const void *blob, int node, pci_dev_t dev)
458 {
459 	struct reg_info {
460 		u32 base;
461 		u32 size;
462 	} values[4], *ptr;
463 	int count;
464 	int i;
465 
466 	count = fdtdec_get_int_array_count(blob, node, "intel,gen-dec",
467 			(u32 *)values, sizeof(values) / sizeof(u32));
468 	if (count < 0)
469 		return -EINVAL;
470 
471 	/* Set COM1/COM2 decode range */
472 	x86_pci_write_config16(dev, LPC_IO_DEC, 0x0010);
473 
474 	/* Enable PS/2 Keyboard/Mouse, EC areas and COM1 */
475 	x86_pci_write_config16(dev, LPC_EN, KBC_LPC_EN | MC_LPC_EN |
476 			   GAMEL_LPC_EN | COMA_LPC_EN);
477 
478 	/* Write all registers but use 0 if we run out of data */
479 	count = count * sizeof(u32) / sizeof(values[0]);
480 	for (i = 0, ptr = values; i < ARRAY_SIZE(values); i++, ptr++) {
481 		u32 reg = 0;
482 
483 		if (i < count)
484 			reg = ptr->base | PCI_COMMAND_IO | (ptr->size << 16);
485 		x86_pci_write_config32(dev, LPC_GENX_DEC(i), reg);
486 	}
487 
488 	return 0;
489 }
490 
491 int lpc_init(struct pci_controller *hose, pci_dev_t dev)
492 {
493 	const void *blob = gd->fdt_blob;
494 	int node;
495 
496 	debug("pch: lpc_init\n");
497 	pci_write_bar32(hose, dev, 0, 0);
498 	pci_write_bar32(hose, dev, 1, 0xff800000);
499 	pci_write_bar32(hose, dev, 2, 0xfec00000);
500 	pci_write_bar32(hose, dev, 3, 0x800);
501 	pci_write_bar32(hose, dev, 4, 0x900);
502 
503 	node = fdtdec_next_compatible(blob, 0, COMPAT_INTEL_PCH);
504 	if (node < 0)
505 		return -ENOENT;
506 
507 	/* Set the value for PCI command register. */
508 	x86_pci_write_config16(dev, PCI_COMMAND, 0x000f);
509 
510 	/* IO APIC initialization. */
511 	pch_enable_apic(dev);
512 
513 	pch_enable_serial_irqs(dev);
514 
515 	/* Setup the PIRQ. */
516 	pch_pirq_init(blob, node, dev);
517 
518 	/* Setup power options. */
519 	pch_power_options(blob, node, dev);
520 
521 	/* Initialize power management */
522 	switch (pch_silicon_type()) {
523 	case PCH_TYPE_CPT: /* CougarPoint */
524 		cpt_pm_init(dev);
525 		break;
526 	case PCH_TYPE_PPT: /* PantherPoint */
527 		ppt_pm_init(dev);
528 		break;
529 	default:
530 		printf("Unknown Chipset: %#02x.%dx\n", PCI_DEV(dev),
531 		       PCI_FUNC(dev));
532 		return -ENOSYS;
533 	}
534 
535 	/* Initialize the real time clock. */
536 	pch_rtc_init(dev);
537 
538 	/* Initialize the High Precision Event Timers, if present. */
539 	enable_hpet();
540 
541 	/* Initialize Clock Gating */
542 	enable_clock_gating(dev);
543 
544 	pch_disable_smm_only_flashing(dev);
545 
546 #if CONFIG_HAVE_SMI_HANDLER
547 	pch_lock_smm(dev);
548 #endif
549 
550 	pch_fixups(dev);
551 
552 	return 0;
553 }
554 
555 void lpc_enable(pci_dev_t dev)
556 {
557 	/* Enable PCH Display Port */
558 	writew(0x0010, RCB_REG(DISPBDF));
559 	setbits_le32(RCB_REG(FD2), PCH_ENABLE_DBDF);
560 }
561 
562 static const struct udevice_id bd82x6x_lpc_ids[] = {
563 	{ .compatible = "intel,bd82x6x-lpc" },
564 	{ }
565 };
566 
567 U_BOOT_DRIVER(bd82x6x_lpc_drv) = {
568 	.name		= "lpc",
569 	.id		= UCLASS_LPC,
570 	.of_match	= bd82x6x_lpc_ids,
571 };
572