1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2016 Google, Inc
5 * Based on code from coreboot src/soc/intel/broadwell/cpu.c
12 #include <asm/cpu_x86.h>
13 #include <asm/cpu_common.h>
14 #include <asm/intel_regs.h>
17 #include <asm/turbo.h>
18 #include <asm/arch/cpu.h>
19 #include <asm/arch/pch.h>
20 #include <asm/arch/rcb.h>
22 struct cpu_broadwell_priv {
26 /* Convert time in seconds to POWER_LIMIT_1_TIME MSR value */
27 static const u8 power_limit_time_sec_to_msr[] = {
55 /* Convert POWER_LIMIT_1_TIME MSR value to seconds */
56 static const u8 power_limit_time_msr_to_sec[] = {
85 * The core 100MHz BLCK is disabled in deeper c-states. One needs to calibrate
86 * the 100MHz BCLCK against the 24MHz BLCK to restore the clocks properly
87 * when a core is woken up
89 static int pcode_ready(void)
92 const int delay_step = 10;
96 if (!(readl(MCHBAR_REG(BIOS_MAILBOX_INTERFACE)) &
99 wait_count += delay_step;
101 } while (wait_count < 1000);
106 static u32 pcode_mailbox_read(u32 command)
112 debug("PCODE: mailbox timeout on wait ready\n");
116 /* Send command and start transaction */
117 writel(command | MAILBOX_RUN_BUSY, MCHBAR_REG(BIOS_MAILBOX_INTERFACE));
121 debug("PCODE: mailbox timeout on completion\n");
126 return readl(MCHBAR_REG(BIOS_MAILBOX_DATA));
129 static int pcode_mailbox_write(u32 command, u32 data)
135 debug("PCODE: mailbox timeout on wait ready\n");
139 writel(data, MCHBAR_REG(BIOS_MAILBOX_DATA));
141 /* Send command and start transaction */
142 writel(command | MAILBOX_RUN_BUSY, MCHBAR_REG(BIOS_MAILBOX_INTERFACE));
146 debug("PCODE: mailbox timeout on completion\n");
153 /* @dev is the CPU device */
154 static void initialize_vr_config(struct udevice *dev)
159 debug("Initializing VR config\n");
161 /* Configure VR_CURRENT_CONFIG */
162 msr = msr_read(MSR_VR_CURRENT_CONFIG);
164 * Preserve bits 63 and 62. Bit 62 is PSI4 enable, but it is only valid
167 msr.hi &= 0xc0000000;
168 msr.hi |= (0x01 << (52 - 32)); /* PSI3 threshold - 1A */
169 msr.hi |= (0x05 << (42 - 32)); /* PSI2 threshold - 5A */
170 msr.hi |= (0x14 << (32 - 32)); /* PSI1 threshold - 20A */
171 msr.hi |= (1 << (62 - 32)); /* Enable PSI4 */
172 /* Leave the max instantaneous current limit (12:0) to default */
173 msr_write(MSR_VR_CURRENT_CONFIG, msr);
175 /* Configure VR_MISC_CONFIG MSR */
176 msr = msr_read(MSR_VR_MISC_CONFIG);
177 /* Set the IOUT_SLOPE scalar applied to dIout in U10.1.9 format */
178 msr.hi &= ~(0x3ff << (40 - 32));
179 msr.hi |= (0x200 << (40 - 32)); /* 1.0 */
180 /* Set IOUT_OFFSET to 0 */
182 /* Set entry ramp rate to slow */
183 msr.hi &= ~(1 << (51 - 32));
184 /* Enable decay mode on C-state entry */
185 msr.hi |= (1 << (52 - 32));
186 /* Set the slow ramp rate */
187 msr.hi &= ~(0x3 << (53 - 32));
188 /* Configure the C-state exit ramp rate */
189 ramp = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
190 "intel,slow-ramp", -1);
192 /* Configured slow ramp rate */
193 msr.hi |= ((ramp & 0x3) << (53 - 32));
194 /* Set exit ramp rate to slow */
195 msr.hi &= ~(1 << (50 - 32));
197 /* Fast ramp rate / 4 */
198 msr.hi |= (0x01 << (53 - 32));
199 /* Set exit ramp rate to fast */
200 msr.hi |= (1 << (50 - 32));
202 /* Set MIN_VID (31:24) to allow CPU to have full control */
203 msr.lo &= ~0xff000000;
204 min_vid = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
206 msr.lo |= (min_vid & 0xff) << 24;
207 msr_write(MSR_VR_MISC_CONFIG, msr);
209 /* Configure VR_MISC_CONFIG2 MSR */
210 msr = msr_read(MSR_VR_MISC_CONFIG2);
213 * Allow CPU to control minimum voltage completely (15:8) and
214 * set the fast ramp voltage in 10mV steps
216 if (cpu_get_family_model() == BROADWELL_FAMILY_ULT)
217 msr.lo |= 0x006a; /* 1.56V */
219 msr.lo |= 0x006f; /* 1.60V */
220 msr_write(MSR_VR_MISC_CONFIG2, msr);
222 /* Set C9/C10 VCC Min */
223 pcode_mailbox_write(MAILBOX_BIOS_CMD_WRITE_C9C10_VOLTAGE, 0x1f1f);
226 static int calibrate_24mhz_bclk(void)
235 /* A non-zero value initiates the PCODE calibration */
236 writel(~0, MCHBAR_REG(BIOS_MAILBOX_DATA));
237 writel(MAILBOX_RUN_BUSY | MAILBOX_BIOS_CMD_FSM_MEASURE_INTVL,
238 MCHBAR_REG(BIOS_MAILBOX_INTERFACE));
244 err_code = readl(MCHBAR_REG(BIOS_MAILBOX_INTERFACE)) & 0xff;
246 debug("PCODE: 24MHz BLCK calibration response: %d\n", err_code);
248 /* Read the calibrated value */
249 writel(MAILBOX_RUN_BUSY | MAILBOX_BIOS_CMD_READ_CALIBRATION,
250 MCHBAR_REG(BIOS_MAILBOX_INTERFACE));
256 debug("PCODE: 24MHz BLCK calibration value: 0x%08x\n",
257 readl(MCHBAR_REG(BIOS_MAILBOX_DATA)));
262 static void configure_pch_power_sharing(void)
264 u32 pch_power, pch_power_ext, pmsync, pmsync2;
267 /* Read PCH Power levels from PCODE */
268 pch_power = pcode_mailbox_read(MAILBOX_BIOS_CMD_READ_PCH_POWER);
269 pch_power_ext = pcode_mailbox_read(MAILBOX_BIOS_CMD_READ_PCH_POWER_EXT);
271 debug("PCH Power: PCODE Levels 0x%08x 0x%08x\n", pch_power,
274 pmsync = readl(RCB_REG(PMSYNC_CONFIG));
275 pmsync2 = readl(RCB_REG(PMSYNC_CONFIG2));
278 * Program PMSYNC_TPR_CONFIG PCH power limit values
279 * pmsync[0:4] = mailbox[0:5]
280 * pmsync[8:12] = mailbox[6:11]
281 * pmsync[16:20] = mailbox[12:17]
283 for (i = 0; i < 3; i++) {
284 u32 level = pch_power & 0x3f;
287 pmsync &= ~(0x1f << (i * 8));
288 pmsync |= (level & 0x1f) << (i * 8);
290 writel(pmsync, RCB_REG(PMSYNC_CONFIG));
293 * Program PMSYNC_TPR_CONFIG2 Extended PCH power limit values
294 * pmsync2[0:4] = mailbox[23:18]
295 * pmsync2[8:12] = mailbox_ext[6:11]
296 * pmsync2[16:20] = mailbox_ext[12:17]
297 * pmsync2[24:28] = mailbox_ext[18:22]
300 pmsync2 |= pch_power & 0x1f;
302 for (i = 1; i < 4; i++) {
303 u32 level = pch_power_ext & 0x3f;
306 pmsync2 &= ~(0x1f << (i * 8));
307 pmsync2 |= (level & 0x1f) << (i * 8);
309 writel(pmsync2, RCB_REG(PMSYNC_CONFIG2));
312 static int bsp_init_before_ap_bringup(struct udevice *dev)
316 initialize_vr_config(dev);
317 ret = calibrate_24mhz_bclk();
320 configure_pch_power_sharing();
325 static int cpu_config_tdp_levels(void)
329 /* Bits 34:33 indicate how many levels supported */
330 platform_info = msr_read(MSR_PLATFORM_INFO);
331 return (platform_info.hi >> 1) & 3;
334 static void set_max_ratio(void)
340 /* Check for configurable TDP option */
341 if (turbo_get_state() == TURBO_ENABLED) {
342 msr = msr_read(MSR_NHM_TURBO_RATIO_LIMIT);
343 perf_ctl.lo = (msr.lo & 0xff) << 8;
344 } else if (cpu_config_tdp_levels()) {
345 /* Set to nominal TDP ratio */
346 msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
347 perf_ctl.lo = (msr.lo & 0xff) << 8;
349 /* Platform Info bits 15:8 give max ratio */
350 msr = msr_read(MSR_PLATFORM_INFO);
351 perf_ctl.lo = msr.lo & 0xff00;
353 msr_write(IA32_PERF_CTL, perf_ctl);
355 debug("cpu: frequency set to %d\n",
356 ((perf_ctl.lo >> 8) & 0xff) * CPU_BCLK);
359 int broadwell_init(struct udevice *dev)
361 struct cpu_broadwell_priv *priv = dev_get_priv(dev);
367 msr = msr_read(CORE_THREAD_COUNT_MSR);
368 num_threads = (msr.lo >> 0) & 0xffff;
369 num_cores = (msr.lo >> 16) & 0xffff;
370 debug("CPU has %u cores, %u threads enabled\n", num_cores,
373 priv->ht_disabled = num_threads == num_cores;
375 ret = bsp_init_before_ap_bringup(dev);
384 static void configure_mca(void)
387 const unsigned int mcg_cap_msr = 0x179;
391 msr = msr_read(mcg_cap_msr);
392 num_banks = msr.lo & 0xff;
396 * TODO(adurbin): This should only be done on a cold boot. Also, some
397 * of these banks are core vs package scope. For now every CPU clears
400 for (i = 0; i < num_banks; i++)
401 msr_write(MSR_IA32_MC0_STATUS + (i * 4), msr);
404 static void enable_lapic_tpr(void)
408 msr = msr_read(MSR_PIC_MSG_CONTROL);
409 msr.lo &= ~(1 << 10); /* Enable APIC TPR updates */
410 msr_write(MSR_PIC_MSG_CONTROL, msr);
413 static void configure_c_states(void)
417 msr = msr_read(MSR_PMG_CST_CONFIG_CONTROL);
418 msr.lo |= (1 << 31); /* Timed MWAIT Enable */
419 msr.lo |= (1 << 30); /* Package c-state Undemotion Enable */
420 msr.lo |= (1 << 29); /* Package c-state Demotion Enable */
421 msr.lo |= (1 << 28); /* C1 Auto Undemotion Enable */
422 msr.lo |= (1 << 27); /* C3 Auto Undemotion Enable */
423 msr.lo |= (1 << 26); /* C1 Auto Demotion Enable */
424 msr.lo |= (1 << 25); /* C3 Auto Demotion Enable */
425 msr.lo &= ~(1 << 10); /* Disable IO MWAIT redirection */
426 /* The deepest package c-state defaults to factory-configured value */
427 msr_write(MSR_PMG_CST_CONFIG_CONTROL, msr);
429 msr = msr_read(MSR_MISC_PWR_MGMT);
430 msr.lo &= ~(1 << 0); /* Enable P-state HW_ALL coordination */
431 msr_write(MSR_MISC_PWR_MGMT, msr);
433 msr = msr_read(MSR_POWER_CTL);
434 msr.lo |= (1 << 18); /* Enable Energy Perf Bias MSR 0x1b0 */
435 msr.lo |= (1 << 1); /* C1E Enable */
436 msr.lo |= (1 << 0); /* Bi-directional PROCHOT# */
437 msr_write(MSR_POWER_CTL, msr);
439 /* C-state Interrupt Response Latency Control 0 - package C3 latency */
441 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_0_LIMIT;
442 msr_write(MSR_C_STATE_LATENCY_CONTROL_0, msr);
444 /* C-state Interrupt Response Latency Control 1 */
446 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_1_LIMIT;
447 msr_write(MSR_C_STATE_LATENCY_CONTROL_1, msr);
449 /* C-state Interrupt Response Latency Control 2 - package C6/C7 short */
451 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_2_LIMIT;
452 msr_write(MSR_C_STATE_LATENCY_CONTROL_2, msr);
454 /* C-state Interrupt Response Latency Control 3 - package C8 */
456 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_3_LIMIT;
457 msr_write(MSR_C_STATE_LATENCY_CONTROL_3, msr);
459 /* C-state Interrupt Response Latency Control 4 - package C9 */
461 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_4_LIMIT;
462 msr_write(MSR_C_STATE_LATENCY_CONTROL_4, msr);
464 /* C-state Interrupt Response Latency Control 5 - package C10 */
466 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_5_LIMIT;
467 msr_write(MSR_C_STATE_LATENCY_CONTROL_5, msr);
470 static void configure_misc(void)
474 msr = msr_read(MSR_IA32_MISC_ENABLE);
475 msr.lo |= (1 << 0); /* Fast String enable */
476 msr.lo |= (1 << 3); /* TM1/TM2/EMTTM enable */
477 msr.lo |= (1 << 16); /* Enhanced SpeedStep Enable */
478 msr_write(MSR_IA32_MISC_ENABLE, msr);
480 /* Disable thermal interrupts */
483 msr_write(MSR_IA32_THERM_INTERRUPT, msr);
485 /* Enable package critical interrupt only */
488 msr_write(MSR_IA32_PACKAGE_THERM_INTERRUPT, msr);
491 static void configure_thermal_target(struct udevice *dev)
496 tcc_offset = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
497 "intel,tcc-offset", 0);
499 /* Set TCC activaiton offset if supported */
500 msr = msr_read(MSR_PLATFORM_INFO);
501 if ((msr.lo & (1 << 30)) && tcc_offset) {
502 msr = msr_read(MSR_TEMPERATURE_TARGET);
503 msr.lo &= ~(0xf << 24); /* Bits 27:24 */
504 msr.lo |= (tcc_offset & 0xf) << 24;
505 msr_write(MSR_TEMPERATURE_TARGET, msr);
509 static void configure_dca_cap(void)
511 struct cpuid_result cpuid_regs;
514 /* Check feature flag in CPUID.(EAX=1):ECX[18]==1 */
515 cpuid_regs = cpuid(1);
516 if (cpuid_regs.ecx & (1 << 18)) {
517 msr = msr_read(MSR_IA32_PLATFORM_DCA_CAP);
519 msr_write(MSR_IA32_PLATFORM_DCA_CAP, msr);
523 static void set_energy_perf_bias(u8 policy)
528 /* Determine if energy efficient policy is supported */
529 ecx = cpuid_ecx(0x6);
530 if (!(ecx & (1 << 3)))
533 /* Energy Policy is bits 3:0 */
534 msr = msr_read(MSR_IA32_ENERGY_PERFORMANCE_BIAS);
536 msr.lo |= policy & 0xf;
537 msr_write(MSR_IA32_ENERGY_PERFORMANCE_BIAS, msr);
539 debug("cpu: energy policy set to %u\n", policy);
542 /* All CPUs including BSP will run the following function */
543 static void cpu_core_init(struct udevice *dev)
545 /* Clear out pending MCEs */
548 /* Enable the local cpu apics */
551 /* Configure C States */
552 configure_c_states();
554 /* Configure Enhanced SpeedStep and Thermal Sensors */
557 /* Thermal throttle activation offset */
558 configure_thermal_target(dev);
560 /* Enable Direct Cache Access */
563 /* Set energy policy */
564 set_energy_perf_bias(ENERGY_POLICY_NORMAL);
571 * Configure processor power limits if possible
572 * This must be done AFTER set of BIOS_RESET_CPL
574 void cpu_set_power_limits(int power_limit_1_time)
579 uint tdp, min_power, max_power, max_time;
580 u8 power_limit_1_val;
582 msr = msr_read(MSR_PLATFORM_INFO);
583 if (power_limit_1_time > ARRAY_SIZE(power_limit_time_sec_to_msr))
584 power_limit_1_time = 28;
586 if (!(msr.lo & PLATFORM_INFO_SET_TDP))
590 msr = msr_read(MSR_PKG_POWER_SKU_UNIT);
591 power_unit = 2 << ((msr.lo & 0xf) - 1);
593 /* Get power defaults for this SKU */
594 msr = msr_read(MSR_PKG_POWER_SKU);
595 tdp = msr.lo & 0x7fff;
596 min_power = (msr.lo >> 16) & 0x7fff;
597 max_power = msr.hi & 0x7fff;
598 max_time = (msr.hi >> 16) & 0x7f;
600 debug("CPU TDP: %u Watts\n", tdp / power_unit);
602 if (power_limit_time_msr_to_sec[max_time] > power_limit_1_time)
603 power_limit_1_time = power_limit_time_msr_to_sec[max_time];
605 if (min_power > 0 && tdp < min_power)
608 if (max_power > 0 && tdp > max_power)
611 power_limit_1_val = power_limit_time_sec_to_msr[power_limit_1_time];
613 /* Set long term power limit to TDP */
615 limit.lo |= tdp & PKG_POWER_LIMIT_MASK;
616 limit.lo |= PKG_POWER_LIMIT_EN;
617 limit.lo |= (power_limit_1_val & PKG_POWER_LIMIT_TIME_MASK) <<
618 PKG_POWER_LIMIT_TIME_SHIFT;
620 /* Set short term power limit to 1.25 * TDP */
622 limit.hi |= ((tdp * 125) / 100) & PKG_POWER_LIMIT_MASK;
623 limit.hi |= PKG_POWER_LIMIT_EN;
624 /* Power limit 2 time is only programmable on server SKU */
626 msr_write(MSR_PKG_POWER_LIMIT, limit);
628 /* Set power limit values in MCHBAR as well */
629 writel(limit.lo, MCHBAR_REG(MCH_PKG_POWER_LIMIT_LO));
630 writel(limit.hi, MCHBAR_REG(MCH_PKG_POWER_LIMIT_HI));
632 /* Set DDR RAPL power limit by copying from MMIO to MSR */
633 msr.lo = readl(MCHBAR_REG(MCH_DDR_POWER_LIMIT_LO));
634 msr.hi = readl(MCHBAR_REG(MCH_DDR_POWER_LIMIT_HI));
635 msr_write(MSR_DDR_RAPL_LIMIT, msr);
637 /* Use nominal TDP values for CPUs with configurable TDP */
638 if (cpu_config_tdp_levels()) {
639 msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
641 limit.lo = msr.lo & 0xff;
642 msr_write(MSR_TURBO_ACTIVATION_RATIO, limit);
646 static int broadwell_get_info(struct udevice *dev, struct cpu_info *info)
650 msr = msr_read(IA32_PERF_CTL);
651 info->cpu_freq = ((msr.lo >> 8) & 0xff) * BROADWELL_BCLK * 1000000;
652 info->features = 1 << CPU_FEAT_L1_CACHE | 1 << CPU_FEAT_MMU |
653 1 << CPU_FEAT_UCODE | 1 << CPU_FEAT_DEVICE_ID;
658 static int broadwell_get_count(struct udevice *dev)
663 static int cpu_x86_broadwell_probe(struct udevice *dev)
667 return broadwell_init(dev);
673 static const struct cpu_ops cpu_x86_broadwell_ops = {
674 .get_desc = cpu_x86_get_desc,
675 .get_info = broadwell_get_info,
676 .get_count = broadwell_get_count,
677 .get_vendor = cpu_x86_get_vendor,
680 static const struct udevice_id cpu_x86_broadwell_ids[] = {
681 { .compatible = "intel,core-i3-gen5" },
685 U_BOOT_DRIVER(cpu_x86_broadwell_drv) = {
686 .name = "cpu_x86_broadwell",
688 .of_match = cpu_x86_broadwell_ids,
689 .bind = cpu_x86_bind,
690 .probe = cpu_x86_broadwell_probe,
691 .ops = &cpu_x86_broadwell_ops,
692 .priv_auto_alloc_size = sizeof(struct cpu_broadwell_priv),
693 .flags = DM_FLAG_PRE_RELOC,