arch/x86/cpu/ivybridge/lpc.c

   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 <errno.h>
  11 #include <fdtdec.h>
  12 #include <rtc.h>
  13 #include <pci.h>
  14 #include <asm/acpi.h>
  15 #include <asm/interrupt.h>
  16 #include <asm/io.h>
  17 #include <asm/ioapic.h>
  18 #include <asm/pci.h>
  19 #include <asm/arch/pch.h>
  20
  21 #define NMI_OFF                         0
  22
  23 #define ENABLE_ACPI_MODE_IN_COREBOOT    0
  24 #define TEST_SMM_FLASH_LOCKDOWN         0
  25
  26 static int pch_enable_apic(pci_dev_t dev)
  27 {
  28         u32 reg32;
  29         int i;
  30
  31         /* Enable ACPI I/O and power management. Set SCI IRQ to IRQ9 */
  32         pci_write_config8(dev, ACPI_CNTL, 0x80);
  33
  34         writel(0, IO_APIC_INDEX);
  35         writel(1 << 25, IO_APIC_DATA);
  36
  37         /* affirm full set of redirection table entries ("write once") */
  38         writel(1, IO_APIC_INDEX);
  39         reg32 = readl(IO_APIC_DATA);
  40         writel(1, IO_APIC_INDEX);
  41         writel(reg32, IO_APIC_DATA);
  42
  43         writel(0, IO_APIC_INDEX);
  44         reg32 = readl(IO_APIC_DATA);
  45         debug("PCH APIC ID = %x\n", (reg32 >> 24) & 0x0f);
  46         if (reg32 != (1 << 25)) {
  47                 printf("APIC Error - cannot write to registers\n");
  48                 return -EPERM;
  49         }
  50
  51         debug("Dumping IOAPIC registers\n");
  52         for (i = 0;  i < 3; i++) {
  53                 writel(i, IO_APIC_INDEX);
  54                 debug("  reg 0x%04x:", i);
  55                 reg32 = readl(IO_APIC_DATA);
  56                 debug(" 0x%08x\n", reg32);
  57         }
  58
  59         /* Select Boot Configuration register. */
  60         writel(3, IO_APIC_INDEX);
  61
  62         /* Use Processor System Bus to deliver interrupts. */
  63         writel(1, IO_APIC_DATA);
  64
  65         return 0;
  66 }
  67
  68 static void pch_enable_serial_irqs(pci_dev_t dev)
  69 {
  70         u32 value;
  71
  72         /* Set packet length and toggle silent mode bit for one frame. */
  73         value = (1 << 7) | (1 << 6) | ((21 - 17) << 2) | (0 << 0);
  74 #ifdef CONFIG_SERIRQ_CONTINUOUS_MODE
  75         pci_write_config8(dev, SERIRQ_CNTL, value);
  76 #else
  77         pci_write_config8(dev, SERIRQ_CNTL, value | (1 << 6));
  78 #endif
  79 }
  80
  81 static int pch_pirq_init(const void *blob, int node, pci_dev_t dev)
  82 {
  83         uint8_t route[8], *ptr;
  84
  85         if (fdtdec_get_byte_array(blob, node, "intel,pirq-routing", route,
  86                                   sizeof(route)))
  87                 return -EINVAL;
  88         ptr = route;
  89         pci_write_config8(dev, PIRQA_ROUT, *ptr++);
  90         pci_write_config8(dev, PIRQB_ROUT, *ptr++);
  91         pci_write_config8(dev, PIRQC_ROUT, *ptr++);
  92         pci_write_config8(dev, PIRQD_ROUT, *ptr++);
  93
  94         pci_write_config8(dev, PIRQE_ROUT, *ptr++);
  95         pci_write_config8(dev, PIRQF_ROUT, *ptr++);
  96         pci_write_config8(dev, PIRQG_ROUT, *ptr++);
  97         pci_write_config8(dev, PIRQH_ROUT, *ptr++);
  98
  99         /*
 100          * TODO(sjg@chromium.org): U-Boot does not set up the interrupts
 101          * here. It's unclear if it is needed
 102          */
 103         return 0;
 104 }
 105
 106 static int pch_gpi_routing(const void *blob, int node, pci_dev_t dev)
 107 {
 108         u8 route[16];
 109         u32 reg;
 110         int gpi;
 111
 112         if (fdtdec_get_byte_array(blob, node, "intel,gpi-routing", route,
 113                                   sizeof(route)))
 114                 return -EINVAL;
 115
 116         for (reg = 0, gpi = 0; gpi < ARRAY_SIZE(route); gpi++)
 117                 reg |= route[gpi] << (gpi * 2);
 118
 119         pci_write_config32(dev, 0xb8, reg);
 120
 121         return 0;
 122 }
 123
 124 static int pch_power_options(const void *blob, int node, pci_dev_t dev)
 125 {
 126         u8 reg8;
 127         u16 reg16, pmbase;
 128         u32 reg32;
 129         const char *state;
 130         int pwr_on;
 131         int nmi_option;
 132         int ret;
 133
 134         /*
 135          * Which state do we want to goto after g3 (power restored)?
 136          * 0 == S0 Full On
 137          * 1 == S5 Soft Off
 138          *
 139          * If the option is not existent (Laptops), use Kconfig setting.
 140          * TODO(sjg@chromium.org): Make this configurable
 141          */
 142         pwr_on = MAINBOARD_POWER_ON;
 143
 144         reg16 = pci_read_config16(dev, GEN_PMCON_3);
 145         reg16 &= 0xfffe;
 146         switch (pwr_on) {
 147         case MAINBOARD_POWER_OFF:
 148                 reg16 |= 1;
 149                 state = "off";
 150                 break;
 151         case MAINBOARD_POWER_ON:
 152                 reg16 &= ~1;
 153                 state = "on";
 154                 break;
 155         case MAINBOARD_POWER_KEEP:
 156                 reg16 &= ~1;
 157                 state = "state keep";
 158                 break;
 159         default:
 160                 state = "undefined";
 161         }
 162
 163         reg16 &= ~(3 << 4);     /* SLP_S4# Assertion Stretch 4s */
 164         reg16 |= (1 << 3);      /* SLP_S4# Assertion Stretch Enable */
 165
 166         reg16 &= ~(1 << 10);
 167         reg16 |= (1 << 11);     /* SLP_S3# Min Assertion Width 50ms */
 168
 169         reg16 |= (1 << 12);     /* Disable SLP stretch after SUS well */
 170
 171         pci_write_config16(dev, GEN_PMCON_3, reg16);
 172         debug("Set power %s after power failure.\n", state);
 173
 174         /* Set up NMI on errors. */
 175         reg8 = inb(0x61);
 176         reg8 &= 0x0f;           /* Higher Nibble must be 0 */
 177         reg8 &= ~(1 << 3);      /* IOCHK# NMI Enable */
 178         reg8 |= (1 << 2); /* PCI SERR# Disable for now */
 179         outb(reg8, 0x61);
 180
 181         reg8 = inb(0x70);
 182         /* TODO(sjg@chromium.org): Make this configurable */
 183         nmi_option = NMI_OFF;
 184         if (nmi_option) {
 185                 debug("NMI sources enabled.\n");
 186                 reg8 &= ~(1 << 7);      /* Set NMI. */
 187         } else {
 188                 debug("NMI sources disabled.\n");
 189                 /* Can't mask NMI from PCI-E and NMI_NOW */
 190                 reg8 |= (1 << 7);
 191         }
 192         outb(reg8, 0x70);
 193
 194         /* Enable CPU_SLP# and Intel Speedstep, set SMI# rate down */
 195         reg16 = pci_read_config16(dev, GEN_PMCON_1);
 196         reg16 &= ~(3 << 0);     /* SMI# rate 1 minute */
 197         reg16 &= ~(1 << 10);    /* Disable BIOS_PCI_EXP_EN for native PME */
 198 #if DEBUG_PERIODIC_SMIS
 199         /* Set DEBUG_PERIODIC_SMIS in pch.h to debug using periodic SMIs */
 200         reg16 |= (3 << 0);      /* Periodic SMI every 8s */
 201 #endif
 202         pci_write_config16(dev, GEN_PMCON_1, reg16);
 203
 204         /* Set the board's GPI routing. */
 205         ret = pch_gpi_routing(blob, node, dev);
 206         if (ret)
 207                 return ret;
 208
 209         pmbase = pci_read_config16(dev, 0x40) & 0xfffe;
 210
 211         writel(pmbase + GPE0_EN, fdtdec_get_int(blob, node,
 212                                                 "intel,gpe0-enable", 0));
 213         writew(pmbase + ALT_GP_SMI_EN, fdtdec_get_int(blob, node,
 214                                                 "intel,alt-gp-smi-enable", 0));
 215
 216         /* Set up power management block and determine sleep mode */
 217         reg32 = inl(pmbase + 0x04); /* PM1_CNT */
 218         reg32 &= ~(7 << 10);    /* SLP_TYP */
 219         reg32 |= (1 << 0);      /* SCI_EN */
 220         outl(reg32, pmbase + 0x04);
 221
 222         /* Clear magic status bits to prevent unexpected wake */
 223         setbits_le32(RCB_REG(0x3310), (1 << 4) | (1 << 5) | (1 << 0));
 224         clrbits_le32(RCB_REG(0x3f02), 0xf);
 225
 226         return 0;
 227 }
 228
 229 static void pch_rtc_init(pci_dev_t dev)
 230 {
 231         int rtc_failed;
 232         u8 reg8;
 233
 234         reg8 = pci_read_config8(dev, GEN_PMCON_3);
 235         rtc_failed = reg8 & RTC_BATTERY_DEAD;
 236         if (rtc_failed) {
 237                 reg8 &= ~RTC_BATTERY_DEAD;
 238                 pci_write_config8(dev, GEN_PMCON_3, reg8);
 239         }
 240         debug("rtc_failed = 0x%x\n", rtc_failed);
 241
 242 #if CONFIG_HAVE_ACPI_RESUME
 243         /* Avoid clearing pending interrupts and resetting the RTC control
 244          * register in the resume path because the Linux kernel relies on
 245          * this to know if it should restart the RTC timerqueue if the wake
 246          * was due to the RTC alarm.
 247          */
 248         if (acpi_get_slp_type() == 3)
 249                 return;
 250 #endif
 251         /* TODO: Handle power failure */
 252         if (rtc_failed)
 253                 printf("RTC power failed\n");
 254         rtc_init();
 255 }
 256
 257 /* CougarPoint PCH Power Management init */
 258 static void cpt_pm_init(pci_dev_t dev)
 259 {
 260         debug("CougarPoint PM init\n");
 261         pci_write_config8(dev, 0xa9, 0x47);
 262         setbits_le32(RCB_REG(0x2238), (1 << 6) | (1 << 0));
 263
 264         setbits_le32(RCB_REG(0x228c), 1 << 0);
 265         setbits_le32(RCB_REG(0x1100), (1 << 13) | (1 << 14));
 266         setbits_le32(RCB_REG(0x0900), 1 << 14);
 267         writel(0xc0388400, RCB_REG(0x2304));
 268         setbits_le32(RCB_REG(0x2314), (1 << 5) | (1 << 18));
 269         setbits_le32(RCB_REG(0x2320), (1 << 15) | (1 << 1));
 270         clrsetbits_le32(RCB_REG(0x3314), ~0x1f, 0xf);
 271         writel(0x050f0000, RCB_REG(0x3318));
 272         writel(0x04000000, RCB_REG(0x3324));
 273         setbits_le32(RCB_REG(0x3340), 0xfffff);
 274         setbits_le32(RCB_REG(0x3344), 1 << 1);
 275
 276         writel(0x0001c000, RCB_REG(0x3360));
 277         writel(0x00061100, RCB_REG(0x3368));
 278         writel(0x7f8fdfff, RCB_REG(0x3378));
 279         writel(0x000003fc, RCB_REG(0x337c));
 280         writel(0x00001000, RCB_REG(0x3388));
 281         writel(0x0001c000, RCB_REG(0x3390));
 282         writel(0x00000800, RCB_REG(0x33a0));
 283         writel(0x00001000, RCB_REG(0x33b0));
 284         writel(0x00093900, RCB_REG(0x33c0));
 285         writel(0x24653002, RCB_REG(0x33cc));
 286         writel(0x062108fe, RCB_REG(0x33d0));
 287         clrsetbits_le32(RCB_REG(0x33d4), 0x0fff0fff, 0x00670060);
 288         writel(0x01010000, RCB_REG(0x3a28));
 289         writel(0x01010404, RCB_REG(0x3a2c));
 290         writel(0x01041041, RCB_REG(0x3a80));
 291         clrsetbits_le32(RCB_REG(0x3a84), 0x0000ffff, 0x00001001);
 292         setbits_le32(RCB_REG(0x3a84), 1 << 24); /* SATA 2/3 disabled */
 293         setbits_le32(RCB_REG(0x3a88), 1 << 0);  /* SATA 4/5 disabled */
 294         writel(0x00000001, RCB_REG(0x3a6c));
 295         clrsetbits_le32(RCB_REG(0x2344), ~0x00ffff00, 0xff00000c);
 296         clrsetbits_le32(RCB_REG(0x80c), 0xff << 20, 0x11 << 20);
 297         writel(0, RCB_REG(0x33c8));
 298         setbits_le32(RCB_REG(0x21b0), 0xf);
 299 }
 300
 301 /* PantherPoint PCH Power Management init */
 302 static void ppt_pm_init(pci_dev_t dev)
 303 {
 304         debug("PantherPoint PM init\n");
 305         pci_write_config8(dev, 0xa9, 0x47);
 306         setbits_le32(RCB_REG(0x2238), 1 << 0);
 307         setbits_le32(RCB_REG(0x228c), 1 << 0);
 308         setbits_le16(RCB_REG(0x1100), (1 << 13) | (1 << 14));
 309         setbits_le16(RCB_REG(0x0900), 1 << 14);
 310         writel(0xc03b8400, RCB_REG(0x2304));
 311         setbits_le32(RCB_REG(0x2314), (1 << 5) | (1 << 18));
 312         setbits_le32(RCB_REG(0x2320), (1 << 15) | (1 << 1));
 313         clrsetbits_le32(RCB_REG(0x3314), 0x1f, 0xf);
 314         writel(0x054f0000, RCB_REG(0x3318));
 315         writel(0x04000000, RCB_REG(0x3324));
 316         setbits_le32(RCB_REG(0x3340), 0xfffff);
 317         setbits_le32(RCB_REG(0x3344), (1 << 1) | (1 << 0));
 318         writel(0x0001c000, RCB_REG(0x3360));
 319         writel(0x00061100, RCB_REG(0x3368));
 320         writel(0x7f8fdfff, RCB_REG(0x3378));
 321         writel(0x000003fd, RCB_REG(0x337c));
 322         writel(0x00001000, RCB_REG(0x3388));
 323         writel(0x0001c000, RCB_REG(0x3390));
 324         writel(0x00000800, RCB_REG(0x33a0));
 325         writel(0x00001000, RCB_REG(0x33b0));
 326         writel(0x00093900, RCB_REG(0x33c0));
 327         writel(0x24653002, RCB_REG(0x33cc));
 328         writel(0x067388fe, RCB_REG(0x33d0));
 329         clrsetbits_le32(RCB_REG(0x33d4), 0x0fff0fff, 0x00670060);
 330         writel(0x01010000, RCB_REG(0x3a28));
 331         writel(0x01010404, RCB_REG(0x3a2c));
 332         writel(0x01040000, RCB_REG(0x3a80));
 333         clrsetbits_le32(RCB_REG(0x3a84), 0x0000ffff, 0x00001001);
 334         /* SATA 2/3 disabled */
 335         setbits_le32(RCB_REG(0x3a84), 1 << 24);
 336         /* SATA 4/5 disabled */
 337         setbits_le32(RCB_REG(0x3a88), 1 << 0);
 338         writel(0x00000001, RCB_REG(0x3a6c));
 339         clrsetbits_le32(RCB_REG(0x2344), 0xff0000ff, 0xff00000c);
 340         clrsetbits_le32(RCB_REG(0x80c), 0xff << 20, 0x11 << 20);
 341         setbits_le32(RCB_REG(0x33a4), (1 << 0));
 342         writel(0, RCB_REG(0x33c8));
 343         setbits_le32(RCB_REG(0x21b0), 0xf);
 344 }
 345
 346 static void enable_hpet(void)
 347 {
 348         /* Move HPET to default address 0xfed00000 and enable it */
 349         clrsetbits_le32(RCB_REG(HPTC), 3 << 0, 1 << 7);
 350 }
 351
 352 static void enable_clock_gating(pci_dev_t dev)
 353 {
 354         u32 reg32;
 355         u16 reg16;
 356
 357         setbits_le32(RCB_REG(0x2234), 0xf);
 358
 359         reg16 = pci_read_config16(dev, GEN_PMCON_1);
 360         reg16 |= (1 << 2) | (1 << 11);
 361         pci_write_config16(dev, GEN_PMCON_1, reg16);
 362
 363         pch_iobp_update(0xEB007F07, ~0UL, (1 << 31));
 364         pch_iobp_update(0xEB004000, ~0UL, (1 << 7));
 365         pch_iobp_update(0xEC007F07, ~0UL, (1 << 31));
 366         pch_iobp_update(0xEC004000, ~0UL, (1 << 7));
 367
 368         reg32 = readl(RCB_REG(CG));
 369         reg32 |= (1 << 31);
 370         reg32 |= (1 << 29) | (1 << 28);
 371         reg32 |= (1 << 27) | (1 << 26) | (1 << 25) | (1 << 24);
 372         reg32 |= (1 << 16);
 373         reg32 |= (1 << 17);
 374         reg32 |= (1 << 18);
 375         reg32 |= (1 << 22);
 376         reg32 |= (1 << 23);
 377         reg32 &= ~(1 << 20);
 378         reg32 |= (1 << 19);
 379         reg32 |= (1 << 0);
 380         reg32 |= (0xf << 1);
 381         writel(reg32, RCB_REG(CG));
 382
 383         setbits_le32(RCB_REG(0x38c0), 0x7);
 384         setbits_le32(RCB_REG(0x36d4), 0x6680c004);
 385         setbits_le32(RCB_REG(0x3564), 0x3);
 386 }
 387
 388 #if CONFIG_HAVE_SMI_HANDLER
 389 static void pch_lock_smm(pci_dev_t dev)
 390 {
 391 #if TEST_SMM_FLASH_LOCKDOWN
 392         u8 reg8;
 393 #endif
 394
 395         if (acpi_slp_type != 3) {
 396 #if ENABLE_ACPI_MODE_IN_COREBOOT
 397                 debug("Enabling ACPI via APMC:\n");
 398                 outb(0xe1, 0xb2); /* Enable ACPI mode */
 399                 debug("done.\n");
 400 #else
 401                 debug("Disabling ACPI via APMC:\n");
 402                 outb(0x1e, 0xb2); /* Disable ACPI mode */
 403                 debug("done.\n");
 404 #endif
 405         }
 406
 407         /* Don't allow evil boot loaders, kernels, or
 408          * userspace applications to deceive us:
 409          */
 410         smm_lock();
 411
 412 #if TEST_SMM_FLASH_LOCKDOWN
 413         /* Now try this: */
 414         debug("Locking BIOS to RO... ");
 415         reg8 = pci_read_config8(dev, 0xdc);     /* BIOS_CNTL */
 416         debug(" BLE: %s; BWE: %s\n", (reg8 & 2) ? "on" : "off",
 417               (reg8 & 1) ? "rw" : "ro");
 418         reg8 &= ~(1 << 0);                      /* clear BIOSWE */
 419         pci_write_config8(dev, 0xdc, reg8);
 420         reg8 |= (1 << 1);                       /* set BLE */
 421         pci_write_config8(dev, 0xdc, reg8);
 422         debug("ok.\n");
 423         reg8 = pci_read_config8(dev, 0xdc);     /* BIOS_CNTL */
 424         debug(" BLE: %s; BWE: %s\n", (reg8 & 2) ? "on" : "off",
 425               (reg8 & 1) ? "rw" : "ro");
 426
 427         debug("Writing:\n");
 428         writeb(0, 0xfff00000);
 429         debug("Testing:\n");
 430         reg8 |= (1 << 0);                       /* set BIOSWE */
 431         pci_write_config8(dev, 0xdc, reg8);
 432
 433         reg8 = pci_read_config8(dev, 0xdc);     /* BIOS_CNTL */
 434         debug(" BLE: %s; BWE: %s\n", (reg8 & 2) ? "on" : "off",
 435               (reg8 & 1) ? "rw" : "ro");
 436         debug("Done.\n");
 437 #endif
 438 }
 439 #endif
 440
 441 static void pch_disable_smm_only_flashing(pci_dev_t dev)
 442 {
 443         u8 reg8;
 444
 445         debug("Enabling BIOS updates outside of SMM... ");
 446         reg8 = pci_read_config8(dev, 0xdc);     /* BIOS_CNTL */
 447         reg8 &= ~(1 << 5);
 448         pci_write_config8(dev, 0xdc, reg8);
 449 }
 450
 451 static void pch_fixups(pci_dev_t dev)
 452 {
 453         u8 gen_pmcon_2;
 454
 455         /* Indicate DRAM init done for MRC S3 to know it can resume */
 456         gen_pmcon_2 = pci_read_config8(dev, GEN_PMCON_2);
 457         gen_pmcon_2 |= (1 << 7);
 458         pci_write_config8(dev, GEN_PMCON_2, gen_pmcon_2);
 459
 460         /* Enable DMI ASPM in the PCH */
 461         clrbits_le32(RCB_REG(0x2304), 1 << 10);
 462         setbits_le32(RCB_REG(0x21a4), (1 << 11) | (1 << 10));
 463         setbits_le32(RCB_REG(0x21a8), 0x3);
 464 }
 465
 466 int lpc_early_init(const void *blob, int node, pci_dev_t dev)
 467 {
 468         struct reg_info {
 469                 u32 base;
 470                 u32 size;
 471         } values[4], *ptr;
 472         int count;
 473         int i;
 474
 475         count = fdtdec_get_int_array_count(blob, node, "intel,gen-dec",
 476                         (u32 *)values, sizeof(values) / sizeof(u32));
 477         if (count < 0)
 478                 return -EINVAL;
 479
 480         /* Set COM1/COM2 decode range */
 481         pci_write_config16(dev, LPC_IO_DEC, 0x0010);
 482
 483         /* Enable PS/2 Keyboard/Mouse, EC areas and COM1 */
 484         pci_write_config16(dev, LPC_EN, KBC_LPC_EN | MC_LPC_EN |
 485                            GAMEL_LPC_EN | COMA_LPC_EN);
 486
 487         /* Write all registers but use 0 if we run out of data */
 488         count = count * sizeof(u32) / sizeof(values[0]);
 489         for (i = 0, ptr = values; i < ARRAY_SIZE(values); i++, ptr++) {
 490                 u32 reg = 0;
 491
 492                 if (i < count)
 493                         reg = ptr->base | PCI_COMMAND_IO | (ptr->size << 16);
 494                 pci_write_config32(dev, LPC_GENX_DEC(i), reg);
 495         }
 496
 497         return 0;
 498 }
 499
 500 int lpc_init(struct pci_controller *hose, pci_dev_t dev)
 501 {
 502         const void *blob = gd->fdt_blob;
 503         int node;
 504
 505         debug("pch: lpc_init\n");
 506         pci_write_bar32(hose, dev, 0, 0);
 507         pci_write_bar32(hose, dev, 1, 0xff800000);
 508         pci_write_bar32(hose, dev, 2, 0xfec00000);
 509         pci_write_bar32(hose, dev, 3, 0x800);
 510         pci_write_bar32(hose, dev, 4, 0x900);
 511
 512         node = fdtdec_next_compatible(blob, 0, COMPAT_INTEL_LPC);
 513         if (node < 0)
 514                 return -ENOENT;
 515
 516         /* Set the value for PCI command register. */
 517         pci_write_config16(dev, PCI_COMMAND, 0x000f);
 518
 519         /* IO APIC initialization. */
 520         pch_enable_apic(dev);
 521
 522         pch_enable_serial_irqs(dev);
 523
 524         /* Setup the PIRQ. */
 525         pch_pirq_init(blob, node, dev);
 526
 527         /* Setup power options. */
 528         pch_power_options(blob, node, dev);
 529
 530         /* Initialize power management */
 531         switch (pch_silicon_type()) {
 532         case PCH_TYPE_CPT: /* CougarPoint */
 533                 cpt_pm_init(dev);
 534                 break;
 535         case PCH_TYPE_PPT: /* PantherPoint */
 536                 ppt_pm_init(dev);
 537                 break;
 538         default:
 539                 printf("Unknown Chipset: %#02x.%dx\n", PCI_DEV(dev),
 540                        PCI_FUNC(dev));
 541                 return -ENOSYS;
 542         }
 543
 544         /* Initialize the real time clock. */
 545         pch_rtc_init(dev);
 546
 547         /* Initialize the High Precision Event Timers, if present. */
 548         enable_hpet();
 549
 550         /* Initialize Clock Gating */
 551         enable_clock_gating(dev);
 552
 553         pch_disable_smm_only_flashing(dev);
 554
 555 #if CONFIG_HAVE_SMI_HANDLER
 556         pch_lock_smm(dev);
 557 #endif
 558
 559         pch_fixups(dev);
 560
 561         return 0;
 562 }
 563
 564 void lpc_enable(pci_dev_t dev)
 565 {
 566         /* Enable PCH Display Port */
 567         writew(0x0010, RCB_REG(DISPBDF));
 568         setbits_le32(RCB_REG(FD2), PCH_ENABLE_DBDF);
 569 }