1 /* 2 * From Coreboot file of same name 3 * 4 * Copyright (C) 2007-2009 coresystems GmbH 5 * Copyright (C) 2011 The Chromium Authors 6 * 7 * SPDX-License-Identifier: GPL-2.0 8 */ 9 10 #include <common.h> 11 #include <cpu.h> 12 #include <dm.h> 13 #include <fdtdec.h> 14 #include <malloc.h> 15 #include <asm/cpu.h> 16 #include <asm/cpu_x86.h> 17 #include <asm/msr.h> 18 #include <asm/msr-index.h> 19 #include <asm/mtrr.h> 20 #include <asm/processor.h> 21 #include <asm/speedstep.h> 22 #include <asm/turbo.h> 23 #include <asm/arch/bd82x6x.h> 24 #include <asm/arch/model_206ax.h> 25 26 static void enable_vmx(void) 27 { 28 struct cpuid_result regs; 29 #ifdef CONFIG_ENABLE_VMX 30 int enable = true; 31 #else 32 int enable = false; 33 #endif 34 msr_t msr; 35 36 regs = cpuid(1); 37 /* Check that the VMX is supported before reading or writing the MSR. */ 38 if (!((regs.ecx & CPUID_VMX) || (regs.ecx & CPUID_SMX))) 39 return; 40 41 msr = msr_read(MSR_IA32_FEATURE_CONTROL); 42 43 if (msr.lo & (1 << 0)) { 44 debug("VMX is locked, so %s will do nothing\n", __func__); 45 /* VMX locked. If we set it again we get an illegal 46 * instruction 47 */ 48 return; 49 } 50 51 /* The IA32_FEATURE_CONTROL MSR may initialize with random values. 52 * It must be cleared regardless of VMX config setting. 53 */ 54 msr.hi = 0; 55 msr.lo = 0; 56 57 debug("%s VMX\n", enable ? "Enabling" : "Disabling"); 58 59 /* 60 * Even though the Intel manual says you must set the lock bit in 61 * addition to the VMX bit in order for VMX to work, it is incorrect. 62 * Thus we leave it unlocked for the OS to manage things itself. 63 * This is good for a few reasons: 64 * - No need to reflash the bios just to toggle the lock bit. 65 * - The VMX bits really really should match each other across cores, 66 * so hard locking it on one while another has the opposite setting 67 * can easily lead to crashes as code using VMX migrates between 68 * them. 69 * - Vendors that want to "upsell" from a bios that disables+locks to 70 * one that doesn't is sleazy. 71 * By leaving this to the OS (e.g. Linux), people can do exactly what 72 * they want on the fly, and do it correctly (e.g. across multiple 73 * cores). 74 */ 75 if (enable) { 76 msr.lo |= (1 << 2); 77 if (regs.ecx & CPUID_SMX) 78 msr.lo |= (1 << 1); 79 } 80 81 msr_write(MSR_IA32_FEATURE_CONTROL, msr); 82 } 83 84 /* Convert time in seconds to POWER_LIMIT_1_TIME MSR value */ 85 static const u8 power_limit_time_sec_to_msr[] = { 86 [0] = 0x00, 87 [1] = 0x0a, 88 [2] = 0x0b, 89 [3] = 0x4b, 90 [4] = 0x0c, 91 [5] = 0x2c, 92 [6] = 0x4c, 93 [7] = 0x6c, 94 [8] = 0x0d, 95 [10] = 0x2d, 96 [12] = 0x4d, 97 [14] = 0x6d, 98 [16] = 0x0e, 99 [20] = 0x2e, 100 [24] = 0x4e, 101 [28] = 0x6e, 102 [32] = 0x0f, 103 [40] = 0x2f, 104 [48] = 0x4f, 105 [56] = 0x6f, 106 [64] = 0x10, 107 [80] = 0x30, 108 [96] = 0x50, 109 [112] = 0x70, 110 [128] = 0x11, 111 }; 112 113 /* Convert POWER_LIMIT_1_TIME MSR value to seconds */ 114 static const u8 power_limit_time_msr_to_sec[] = { 115 [0x00] = 0, 116 [0x0a] = 1, 117 [0x0b] = 2, 118 [0x4b] = 3, 119 [0x0c] = 4, 120 [0x2c] = 5, 121 [0x4c] = 6, 122 [0x6c] = 7, 123 [0x0d] = 8, 124 [0x2d] = 10, 125 [0x4d] = 12, 126 [0x6d] = 14, 127 [0x0e] = 16, 128 [0x2e] = 20, 129 [0x4e] = 24, 130 [0x6e] = 28, 131 [0x0f] = 32, 132 [0x2f] = 40, 133 [0x4f] = 48, 134 [0x6f] = 56, 135 [0x10] = 64, 136 [0x30] = 80, 137 [0x50] = 96, 138 [0x70] = 112, 139 [0x11] = 128, 140 }; 141 142 int cpu_config_tdp_levels(void) 143 { 144 struct cpuid_result result; 145 msr_t platform_info; 146 147 /* Minimum CPU revision */ 148 result = cpuid(1); 149 if (result.eax < IVB_CONFIG_TDP_MIN_CPUID) 150 return 0; 151 152 /* Bits 34:33 indicate how many levels supported */ 153 platform_info = msr_read(MSR_PLATFORM_INFO); 154 return (platform_info.hi >> 1) & 3; 155 } 156 157 /* 158 * Configure processor power limits if possible 159 * This must be done AFTER set of BIOS_RESET_CPL 160 */ 161 void set_power_limits(u8 power_limit_1_time) 162 { 163 msr_t msr = msr_read(MSR_PLATFORM_INFO); 164 msr_t limit; 165 unsigned power_unit; 166 unsigned tdp, min_power, max_power, max_time; 167 u8 power_limit_1_val; 168 169 if (power_limit_1_time > ARRAY_SIZE(power_limit_time_sec_to_msr)) 170 return; 171 172 if (!(msr.lo & PLATFORM_INFO_SET_TDP)) 173 return; 174 175 /* Get units */ 176 msr = msr_read(MSR_PKG_POWER_SKU_UNIT); 177 power_unit = 2 << ((msr.lo & 0xf) - 1); 178 179 /* Get power defaults for this SKU */ 180 msr = msr_read(MSR_PKG_POWER_SKU); 181 tdp = msr.lo & 0x7fff; 182 min_power = (msr.lo >> 16) & 0x7fff; 183 max_power = msr.hi & 0x7fff; 184 max_time = (msr.hi >> 16) & 0x7f; 185 186 debug("CPU TDP: %u Watts\n", tdp / power_unit); 187 188 if (power_limit_time_msr_to_sec[max_time] > power_limit_1_time) 189 power_limit_1_time = power_limit_time_msr_to_sec[max_time]; 190 191 if (min_power > 0 && tdp < min_power) 192 tdp = min_power; 193 194 if (max_power > 0 && tdp > max_power) 195 tdp = max_power; 196 197 power_limit_1_val = power_limit_time_sec_to_msr[power_limit_1_time]; 198 199 /* Set long term power limit to TDP */ 200 limit.lo = 0; 201 limit.lo |= tdp & PKG_POWER_LIMIT_MASK; 202 limit.lo |= PKG_POWER_LIMIT_EN; 203 limit.lo |= (power_limit_1_val & PKG_POWER_LIMIT_TIME_MASK) << 204 PKG_POWER_LIMIT_TIME_SHIFT; 205 206 /* Set short term power limit to 1.25 * TDP */ 207 limit.hi = 0; 208 limit.hi |= ((tdp * 125) / 100) & PKG_POWER_LIMIT_MASK; 209 limit.hi |= PKG_POWER_LIMIT_EN; 210 /* Power limit 2 time is only programmable on SNB EP/EX */ 211 212 msr_write(MSR_PKG_POWER_LIMIT, limit); 213 214 /* Use nominal TDP values for CPUs with configurable TDP */ 215 if (cpu_config_tdp_levels()) { 216 msr = msr_read(MSR_CONFIG_TDP_NOMINAL); 217 limit.hi = 0; 218 limit.lo = msr.lo & 0xff; 219 msr_write(MSR_TURBO_ACTIVATION_RATIO, limit); 220 } 221 } 222 223 static void configure_c_states(void) 224 { 225 struct cpuid_result result; 226 msr_t msr; 227 228 msr = msr_read(MSR_PMG_CST_CONFIG_CTL); 229 msr.lo |= (1 << 28); /* C1 Auto Undemotion Enable */ 230 msr.lo |= (1 << 27); /* C3 Auto Undemotion Enable */ 231 msr.lo |= (1 << 26); /* C1 Auto Demotion Enable */ 232 msr.lo |= (1 << 25); /* C3 Auto Demotion Enable */ 233 msr.lo &= ~(1 << 10); /* Disable IO MWAIT redirection */ 234 msr.lo |= 7; /* No package C-state limit */ 235 msr_write(MSR_PMG_CST_CONFIG_CTL, msr); 236 237 msr = msr_read(MSR_PMG_IO_CAPTURE_ADR); 238 msr.lo &= ~0x7ffff; 239 msr.lo |= (PMB0_BASE + 4); /* LVL_2 base address */ 240 msr.lo |= (2 << 16); /* CST Range: C7 is max C-state */ 241 msr_write(MSR_PMG_IO_CAPTURE_ADR, msr); 242 243 msr = msr_read(MSR_MISC_PWR_MGMT); 244 msr.lo &= ~(1 << 0); /* Enable P-state HW_ALL coordination */ 245 msr_write(MSR_MISC_PWR_MGMT, msr); 246 247 msr = msr_read(MSR_POWER_CTL); 248 msr.lo |= (1 << 18); /* Enable Energy Perf Bias MSR 0x1b0 */ 249 msr.lo |= (1 << 1); /* C1E Enable */ 250 msr.lo |= (1 << 0); /* Bi-directional PROCHOT# */ 251 msr_write(MSR_POWER_CTL, msr); 252 253 /* C3 Interrupt Response Time Limit */ 254 msr.hi = 0; 255 msr.lo = IRTL_VALID | IRTL_1024_NS | 0x50; 256 msr_write(MSR_PKGC3_IRTL, msr); 257 258 /* C6 Interrupt Response Time Limit */ 259 msr.hi = 0; 260 msr.lo = IRTL_VALID | IRTL_1024_NS | 0x68; 261 msr_write(MSR_PKGC6_IRTL, msr); 262 263 /* C7 Interrupt Response Time Limit */ 264 msr.hi = 0; 265 msr.lo = IRTL_VALID | IRTL_1024_NS | 0x6D; 266 msr_write(MSR_PKGC7_IRTL, msr); 267 268 /* Primary Plane Current Limit */ 269 msr = msr_read(MSR_PP0_CURRENT_CONFIG); 270 msr.lo &= ~0x1fff; 271 msr.lo |= PP0_CURRENT_LIMIT; 272 msr_write(MSR_PP0_CURRENT_CONFIG, msr); 273 274 /* Secondary Plane Current Limit */ 275 msr = msr_read(MSR_PP1_CURRENT_CONFIG); 276 msr.lo &= ~0x1fff; 277 result = cpuid(1); 278 if (result.eax >= 0x30600) 279 msr.lo |= PP1_CURRENT_LIMIT_IVB; 280 else 281 msr.lo |= PP1_CURRENT_LIMIT_SNB; 282 msr_write(MSR_PP1_CURRENT_CONFIG, msr); 283 } 284 285 static int configure_thermal_target(struct udevice *dev) 286 { 287 int tcc_offset; 288 msr_t msr; 289 290 tcc_offset = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "tcc-offset", 291 0); 292 293 /* Set TCC activaiton offset if supported */ 294 msr = msr_read(MSR_PLATFORM_INFO); 295 if ((msr.lo & (1 << 30)) && tcc_offset) { 296 msr = msr_read(MSR_TEMPERATURE_TARGET); 297 msr.lo &= ~(0xf << 24); /* Bits 27:24 */ 298 msr.lo |= (tcc_offset & 0xf) << 24; 299 msr_write(MSR_TEMPERATURE_TARGET, msr); 300 } 301 302 return 0; 303 } 304 305 static void configure_misc(void) 306 { 307 msr_t msr; 308 309 msr = msr_read(IA32_MISC_ENABLE); 310 msr.lo |= (1 << 0); /* Fast String enable */ 311 msr.lo |= (1 << 3); /* TM1/TM2/EMTTM enable */ 312 msr.lo |= (1 << 16); /* Enhanced SpeedStep Enable */ 313 msr_write(IA32_MISC_ENABLE, msr); 314 315 /* Disable Thermal interrupts */ 316 msr.lo = 0; 317 msr.hi = 0; 318 msr_write(IA32_THERM_INTERRUPT, msr); 319 320 /* Enable package critical interrupt only */ 321 msr.lo = 1 << 4; 322 msr.hi = 0; 323 msr_write(IA32_PACKAGE_THERM_INTERRUPT, msr); 324 } 325 326 static void enable_lapic_tpr(void) 327 { 328 msr_t msr; 329 330 msr = msr_read(MSR_PIC_MSG_CONTROL); 331 msr.lo &= ~(1 << 10); /* Enable APIC TPR updates */ 332 msr_write(MSR_PIC_MSG_CONTROL, msr); 333 } 334 335 static void configure_dca_cap(void) 336 { 337 struct cpuid_result cpuid_regs; 338 msr_t msr; 339 340 /* Check feature flag in CPUID.(EAX=1):ECX[18]==1 */ 341 cpuid_regs = cpuid(1); 342 if (cpuid_regs.ecx & (1 << 18)) { 343 msr = msr_read(IA32_PLATFORM_DCA_CAP); 344 msr.lo |= 1; 345 msr_write(IA32_PLATFORM_DCA_CAP, msr); 346 } 347 } 348 349 static void set_max_ratio(void) 350 { 351 msr_t msr, perf_ctl; 352 353 perf_ctl.hi = 0; 354 355 /* Check for configurable TDP option */ 356 if (cpu_config_tdp_levels()) { 357 /* Set to nominal TDP ratio */ 358 msr = msr_read(MSR_CONFIG_TDP_NOMINAL); 359 perf_ctl.lo = (msr.lo & 0xff) << 8; 360 } else { 361 /* Platform Info bits 15:8 give max ratio */ 362 msr = msr_read(MSR_PLATFORM_INFO); 363 perf_ctl.lo = msr.lo & 0xff00; 364 } 365 msr_write(MSR_IA32_PERF_CTL, perf_ctl); 366 367 debug("model_x06ax: frequency set to %d\n", 368 ((perf_ctl.lo >> 8) & 0xff) * SANDYBRIDGE_BCLK); 369 } 370 371 static void set_energy_perf_bias(u8 policy) 372 { 373 msr_t msr; 374 375 /* Energy Policy is bits 3:0 */ 376 msr = msr_read(IA32_ENERGY_PERFORMANCE_BIAS); 377 msr.lo &= ~0xf; 378 msr.lo |= policy & 0xf; 379 msr_write(IA32_ENERGY_PERFORMANCE_BIAS, msr); 380 381 debug("model_x06ax: energy policy set to %u\n", policy); 382 } 383 384 static void configure_mca(void) 385 { 386 msr_t msr; 387 int i; 388 389 msr.lo = 0; 390 msr.hi = 0; 391 /* This should only be done on a cold boot */ 392 for (i = 0; i < 7; i++) 393 msr_write(IA32_MC0_STATUS + (i * 4), msr); 394 } 395 396 #if CONFIG_USBDEBUG 397 static unsigned ehci_debug_addr; 398 #endif 399 400 static int model_206ax_init(struct udevice *dev) 401 { 402 int ret; 403 404 /* Clear out pending MCEs */ 405 configure_mca(); 406 407 #if CONFIG_USBDEBUG 408 /* Is this caution really needed? */ 409 if (!ehci_debug_addr) 410 ehci_debug_addr = get_ehci_debug(); 411 set_ehci_debug(0); 412 #endif 413 414 #if CONFIG_USBDEBUG 415 set_ehci_debug(ehci_debug_addr); 416 #endif 417 418 /* Enable the local cpu apics */ 419 enable_lapic_tpr(); 420 421 /* Enable virtualization if enabled in CMOS */ 422 enable_vmx(); 423 424 /* Configure C States */ 425 configure_c_states(); 426 427 /* Configure Enhanced SpeedStep and Thermal Sensors */ 428 configure_misc(); 429 430 /* Thermal throttle activation offset */ 431 ret = configure_thermal_target(dev); 432 if (ret) { 433 debug("Cannot set thermal target\n"); 434 return ret; 435 } 436 437 /* Enable Direct Cache Access */ 438 configure_dca_cap(); 439 440 /* Set energy policy */ 441 set_energy_perf_bias(ENERGY_POLICY_NORMAL); 442 443 /* Set Max Ratio */ 444 set_max_ratio(); 445 446 /* Enable Turbo */ 447 turbo_enable(); 448 449 return 0; 450 } 451 452 static int model_206ax_get_info(struct udevice *dev, struct cpu_info *info) 453 { 454 msr_t msr; 455 456 msr = msr_read(MSR_IA32_PERF_CTL); 457 info->cpu_freq = ((msr.lo >> 8) & 0xff) * SANDYBRIDGE_BCLK * 1000000; 458 info->features = 1 << CPU_FEAT_L1_CACHE | 1 << CPU_FEAT_MMU | 459 1 << CPU_FEAT_UCODE; 460 461 return 0; 462 } 463 464 static int model_206ax_get_count(struct udevice *dev) 465 { 466 return 4; 467 } 468 469 static int cpu_x86_model_206ax_probe(struct udevice *dev) 470 { 471 if (dev->seq == 0) 472 model_206ax_init(dev); 473 474 return 0; 475 } 476 477 static const struct cpu_ops cpu_x86_model_206ax_ops = { 478 .get_desc = cpu_x86_get_desc, 479 .get_info = model_206ax_get_info, 480 .get_count = model_206ax_get_count, 481 }; 482 483 static const struct udevice_id cpu_x86_model_206ax_ids[] = { 484 { .compatible = "intel,core-gen3" }, 485 { } 486 }; 487 488 U_BOOT_DRIVER(cpu_x86_model_206ax_drv) = { 489 .name = "cpu_x86_model_206ax", 490 .id = UCLASS_CPU, 491 .of_match = cpu_x86_model_206ax_ids, 492 .bind = cpu_x86_bind, 493 .probe = cpu_x86_model_206ax_probe, 494 .ops = &cpu_x86_model_206ax_ops, 495 }; 496