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
14 #include <asm/cpu_x86.h>
15 #include <asm/cpu_common.h>
16 #include <asm/global_data.h>
17 #include <asm/intel_regs.h>
20 #include <asm/turbo.h>
21 #include <asm/arch/cpu.h>
22 #include <asm/arch/pch.h>
23 #include <asm/arch/rcb.h>
24 #include <linux/delay.h>
26 struct cpu_broadwell_priv {
30 /* Convert time in seconds to POWER_LIMIT_1_TIME MSR value */
31 static const u8 power_limit_time_sec_to_msr[] = {
59 /* Convert POWER_LIMIT_1_TIME MSR value to seconds */
60 static const u8 power_limit_time_msr_to_sec[] = {
88 #if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD)
89 int arch_cpu_init(void)
96 * The core 100MHz BLCK is disabled in deeper c-states. One needs to calibrate
97 * the 100MHz BCLCK against the 24MHz BLCK to restore the clocks properly
98 * when a core is woken up
100 static int pcode_ready(void)
103 const int delay_step = 10;
107 if (!(readl(MCHBAR_REG(BIOS_MAILBOX_INTERFACE)) &
110 wait_count += delay_step;
112 } while (wait_count < 1000);
117 static u32 pcode_mailbox_read(u32 command)
123 debug("PCODE: mailbox timeout on wait ready\n");
127 /* Send command and start transaction */
128 writel(command | MAILBOX_RUN_BUSY, MCHBAR_REG(BIOS_MAILBOX_INTERFACE));
132 debug("PCODE: mailbox timeout on completion\n");
137 return readl(MCHBAR_REG(BIOS_MAILBOX_DATA));
140 static int pcode_mailbox_write(u32 command, u32 data)
146 debug("PCODE: mailbox timeout on wait ready\n");
150 writel(data, MCHBAR_REG(BIOS_MAILBOX_DATA));
152 /* Send command and start transaction */
153 writel(command | MAILBOX_RUN_BUSY, MCHBAR_REG(BIOS_MAILBOX_INTERFACE));
157 debug("PCODE: mailbox timeout on completion\n");
164 /* @dev is the CPU device */
165 static void initialize_vr_config(struct udevice *dev)
170 debug("Initializing VR config\n");
172 /* Configure VR_CURRENT_CONFIG */
173 msr = msr_read(MSR_VR_CURRENT_CONFIG);
175 * Preserve bits 63 and 62. Bit 62 is PSI4 enable, but it is only valid
178 msr.hi &= 0xc0000000;
179 msr.hi |= (0x01 << (52 - 32)); /* PSI3 threshold - 1A */
180 msr.hi |= (0x05 << (42 - 32)); /* PSI2 threshold - 5A */
181 msr.hi |= (0x14 << (32 - 32)); /* PSI1 threshold - 20A */
182 msr.hi |= (1 << (62 - 32)); /* Enable PSI4 */
183 /* Leave the max instantaneous current limit (12:0) to default */
184 msr_write(MSR_VR_CURRENT_CONFIG, msr);
186 /* Configure VR_MISC_CONFIG MSR */
187 msr = msr_read(MSR_VR_MISC_CONFIG);
188 /* Set the IOUT_SLOPE scalar applied to dIout in U10.1.9 format */
189 msr.hi &= ~(0x3ff << (40 - 32));
190 msr.hi |= (0x200 << (40 - 32)); /* 1.0 */
191 /* Set IOUT_OFFSET to 0 */
193 /* Set entry ramp rate to slow */
194 msr.hi &= ~(1 << (51 - 32));
195 /* Enable decay mode on C-state entry */
196 msr.hi |= (1 << (52 - 32));
197 /* Set the slow ramp rate */
198 msr.hi &= ~(0x3 << (53 - 32));
199 /* Configure the C-state exit ramp rate */
200 ramp = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
201 "intel,slow-ramp", -1);
203 /* Configured slow ramp rate */
204 msr.hi |= ((ramp & 0x3) << (53 - 32));
205 /* Set exit ramp rate to slow */
206 msr.hi &= ~(1 << (50 - 32));
208 /* Fast ramp rate / 4 */
209 msr.hi |= (0x01 << (53 - 32));
210 /* Set exit ramp rate to fast */
211 msr.hi |= (1 << (50 - 32));
213 /* Set MIN_VID (31:24) to allow CPU to have full control */
214 msr.lo &= ~0xff000000;
215 min_vid = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
217 msr.lo |= (min_vid & 0xff) << 24;
218 msr_write(MSR_VR_MISC_CONFIG, msr);
220 /* Configure VR_MISC_CONFIG2 MSR */
221 msr = msr_read(MSR_VR_MISC_CONFIG2);
224 * Allow CPU to control minimum voltage completely (15:8) and
225 * set the fast ramp voltage in 10mV steps
227 if (cpu_get_family_model() == BROADWELL_FAMILY_ULT)
228 msr.lo |= 0x006a; /* 1.56V */
230 msr.lo |= 0x006f; /* 1.60V */
231 msr_write(MSR_VR_MISC_CONFIG2, msr);
233 /* Set C9/C10 VCC Min */
234 pcode_mailbox_write(MAILBOX_BIOS_CMD_WRITE_C9C10_VOLTAGE, 0x1f1f);
237 static int calibrate_24mhz_bclk(void)
246 /* A non-zero value initiates the PCODE calibration */
247 writel(~0, MCHBAR_REG(BIOS_MAILBOX_DATA));
248 writel(MAILBOX_RUN_BUSY | MAILBOX_BIOS_CMD_FSM_MEASURE_INTVL,
249 MCHBAR_REG(BIOS_MAILBOX_INTERFACE));
255 err_code = readl(MCHBAR_REG(BIOS_MAILBOX_INTERFACE)) & 0xff;
257 debug("PCODE: 24MHz BLCK calibration response: %d\n", err_code);
259 /* Read the calibrated value */
260 writel(MAILBOX_RUN_BUSY | MAILBOX_BIOS_CMD_READ_CALIBRATION,
261 MCHBAR_REG(BIOS_MAILBOX_INTERFACE));
267 debug("PCODE: 24MHz BLCK calibration value: 0x%08x\n",
268 readl(MCHBAR_REG(BIOS_MAILBOX_DATA)));
273 static void configure_pch_power_sharing(void)
275 u32 pch_power, pch_power_ext, pmsync, pmsync2;
278 /* Read PCH Power levels from PCODE */
279 pch_power = pcode_mailbox_read(MAILBOX_BIOS_CMD_READ_PCH_POWER);
280 pch_power_ext = pcode_mailbox_read(MAILBOX_BIOS_CMD_READ_PCH_POWER_EXT);
282 debug("PCH Power: PCODE Levels 0x%08x 0x%08x\n", pch_power,
285 pmsync = readl(RCB_REG(PMSYNC_CONFIG));
286 pmsync2 = readl(RCB_REG(PMSYNC_CONFIG2));
289 * Program PMSYNC_TPR_CONFIG PCH power limit values
290 * pmsync[0:4] = mailbox[0:5]
291 * pmsync[8:12] = mailbox[6:11]
292 * pmsync[16:20] = mailbox[12:17]
294 for (i = 0; i < 3; i++) {
295 u32 level = pch_power & 0x3f;
298 pmsync &= ~(0x1f << (i * 8));
299 pmsync |= (level & 0x1f) << (i * 8);
301 writel(pmsync, RCB_REG(PMSYNC_CONFIG));
304 * Program PMSYNC_TPR_CONFIG2 Extended PCH power limit values
305 * pmsync2[0:4] = mailbox[23:18]
306 * pmsync2[8:12] = mailbox_ext[6:11]
307 * pmsync2[16:20] = mailbox_ext[12:17]
308 * pmsync2[24:28] = mailbox_ext[18:22]
311 pmsync2 |= pch_power & 0x1f;
313 for (i = 1; i < 4; i++) {
314 u32 level = pch_power_ext & 0x3f;
317 pmsync2 &= ~(0x1f << (i * 8));
318 pmsync2 |= (level & 0x1f) << (i * 8);
320 writel(pmsync2, RCB_REG(PMSYNC_CONFIG2));
323 static int bsp_init_before_ap_bringup(struct udevice *dev)
327 initialize_vr_config(dev);
328 ret = calibrate_24mhz_bclk();
331 configure_pch_power_sharing();
336 static void set_max_ratio(void)
342 /* Check for configurable TDP option */
343 if (turbo_get_state() == TURBO_ENABLED) {
344 msr = msr_read(MSR_TURBO_RATIO_LIMIT);
345 perf_ctl.lo = (msr.lo & 0xff) << 8;
346 } else if (cpu_config_tdp_levels()) {
347 /* Set to nominal TDP ratio */
348 msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
349 perf_ctl.lo = (msr.lo & 0xff) << 8;
351 /* Platform Info bits 15:8 give max ratio */
352 msr = msr_read(MSR_PLATFORM_INFO);
353 perf_ctl.lo = msr.lo & 0xff00;
355 msr_write(MSR_IA32_PERF_CTL, perf_ctl);
357 debug("cpu: frequency set to %d\n",
358 ((perf_ctl.lo >> 8) & 0xff) * INTEL_BCLK_MHZ);
361 int broadwell_init(struct udevice *dev)
363 struct cpu_broadwell_priv *priv = dev_get_priv(dev);
369 msr = msr_read(CORE_THREAD_COUNT_MSR);
370 num_threads = (msr.lo >> 0) & 0xffff;
371 num_cores = (msr.lo >> 16) & 0xffff;
372 debug("CPU has %u cores, %u threads enabled\n", num_cores,
375 priv->ht_disabled = num_threads == num_cores;
377 ret = bsp_init_before_ap_bringup(dev);
386 static void configure_mca(void)
389 const unsigned int mcg_cap_msr = 0x179;
393 msr = msr_read(mcg_cap_msr);
394 num_banks = msr.lo & 0xff;
398 * TODO(adurbin): This should only be done on a cold boot. Also, some
399 * of these banks are core vs package scope. For now every CPU clears
402 for (i = 0; i < num_banks; i++)
403 msr_write(MSR_IA32_MC0_STATUS + (i * 4), msr);
406 static void enable_lapic_tpr(void)
410 msr = msr_read(MSR_PIC_MSG_CONTROL);
411 msr.lo &= ~(1 << 10); /* Enable APIC TPR updates */
412 msr_write(MSR_PIC_MSG_CONTROL, msr);
415 static void configure_c_states(void)
419 msr = msr_read(MSR_PMG_CST_CONFIG_CONTROL);
420 msr.lo |= (1 << 31); /* Timed MWAIT Enable */
421 msr.lo |= (1 << 30); /* Package c-state Undemotion Enable */
422 msr.lo |= (1 << 29); /* Package c-state Demotion Enable */
423 msr.lo |= (1 << 28); /* C1 Auto Undemotion Enable */
424 msr.lo |= (1 << 27); /* C3 Auto Undemotion Enable */
425 msr.lo |= (1 << 26); /* C1 Auto Demotion Enable */
426 msr.lo |= (1 << 25); /* C3 Auto Demotion Enable */
427 msr.lo &= ~(1 << 10); /* Disable IO MWAIT redirection */
428 /* The deepest package c-state defaults to factory-configured value */
429 msr_write(MSR_PMG_CST_CONFIG_CONTROL, msr);
431 msr = msr_read(MSR_MISC_PWR_MGMT);
432 msr.lo &= ~(1 << 0); /* Enable P-state HW_ALL coordination */
433 msr_write(MSR_MISC_PWR_MGMT, msr);
435 msr = msr_read(MSR_POWER_CTL);
436 msr.lo |= (1 << 18); /* Enable Energy Perf Bias MSR 0x1b0 */
437 msr.lo |= (1 << 1); /* C1E Enable */
438 msr.lo |= (1 << 0); /* Bi-directional PROCHOT# */
439 msr_write(MSR_POWER_CTL, msr);
441 /* C-state Interrupt Response Latency Control 0 - package C3 latency */
443 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_0_LIMIT;
444 msr_write(MSR_C_STATE_LATENCY_CONTROL_0, msr);
446 /* C-state Interrupt Response Latency Control 1 */
448 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_1_LIMIT;
449 msr_write(MSR_C_STATE_LATENCY_CONTROL_1, msr);
451 /* C-state Interrupt Response Latency Control 2 - package C6/C7 short */
453 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_2_LIMIT;
454 msr_write(MSR_C_STATE_LATENCY_CONTROL_2, msr);
456 /* C-state Interrupt Response Latency Control 3 - package C8 */
458 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_3_LIMIT;
459 msr_write(MSR_C_STATE_LATENCY_CONTROL_3, msr);
461 /* C-state Interrupt Response Latency Control 4 - package C9 */
463 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_4_LIMIT;
464 msr_write(MSR_C_STATE_LATENCY_CONTROL_4, msr);
466 /* C-state Interrupt Response Latency Control 5 - package C10 */
468 msr.lo = IRTL_VALID | IRTL_1024_NS | C_STATE_LATENCY_CONTROL_5_LIMIT;
469 msr_write(MSR_C_STATE_LATENCY_CONTROL_5, msr);
472 static void configure_misc(void)
476 msr = msr_read(MSR_IA32_MISC_ENABLE);
477 msr.lo |= MISC_ENABLE_FAST_STRING;
478 msr.lo |= MISC_ENABLE_TM1;
479 msr.lo |= MISC_ENABLE_ENHANCED_SPEEDSTEP;
480 msr_write(MSR_IA32_MISC_ENABLE, msr);
482 /* Disable thermal interrupts */
485 msr_write(MSR_IA32_THERM_INTERRUPT, msr);
487 /* Enable package critical interrupt only */
490 msr_write(MSR_IA32_PACKAGE_THERM_INTERRUPT, msr);
493 static void configure_dca_cap(void)
495 struct cpuid_result cpuid_regs;
498 /* Check feature flag in CPUID.(EAX=1):ECX[18]==1 */
499 cpuid_regs = cpuid(1);
500 if (cpuid_regs.ecx & (1 << 18)) {
501 msr = msr_read(MSR_IA32_PLATFORM_DCA_CAP);
503 msr_write(MSR_IA32_PLATFORM_DCA_CAP, msr);
507 static void set_energy_perf_bias(u8 policy)
512 /* Determine if energy efficient policy is supported */
513 ecx = cpuid_ecx(0x6);
514 if (!(ecx & (1 << 3)))
517 /* Energy Policy is bits 3:0 */
518 msr = msr_read(MSR_IA32_ENERGY_PERFORMANCE_BIAS);
520 msr.lo |= policy & 0xf;
521 msr_write(MSR_IA32_ENERGY_PERFORMANCE_BIAS, msr);
523 debug("cpu: energy policy set to %u\n", policy);
526 /* All CPUs including BSP will run the following function */
527 static void cpu_core_init(struct udevice *dev)
529 /* Clear out pending MCEs */
532 /* Enable the local cpu apics */
535 /* Configure C States */
536 configure_c_states();
538 /* Configure Enhanced SpeedStep and Thermal Sensors */
541 /* Thermal throttle activation offset */
542 cpu_configure_thermal_target(dev);
544 /* Enable Direct Cache Access */
547 /* Set energy policy */
548 set_energy_perf_bias(ENERGY_POLICY_NORMAL);
555 * Configure processor power limits if possible
556 * This must be done AFTER set of BIOS_RESET_CPL
558 void cpu_set_power_limits(int power_limit_1_time)
563 uint tdp, min_power, max_power, max_time;
564 u8 power_limit_1_val;
566 msr = msr_read(MSR_PLATFORM_INFO);
567 if (power_limit_1_time > ARRAY_SIZE(power_limit_time_sec_to_msr))
568 power_limit_1_time = 28;
570 if (!(msr.lo & PLATFORM_INFO_SET_TDP))
574 msr = msr_read(MSR_PKG_POWER_SKU_UNIT);
575 power_unit = 2 << ((msr.lo & 0xf) - 1);
577 /* Get power defaults for this SKU */
578 msr = msr_read(MSR_PKG_POWER_SKU);
579 tdp = msr.lo & 0x7fff;
580 min_power = (msr.lo >> 16) & 0x7fff;
581 max_power = msr.hi & 0x7fff;
582 max_time = (msr.hi >> 16) & 0x7f;
584 debug("CPU TDP: %u Watts\n", tdp / power_unit);
586 if (power_limit_time_msr_to_sec[max_time] > power_limit_1_time)
587 power_limit_1_time = power_limit_time_msr_to_sec[max_time];
589 if (min_power > 0 && tdp < min_power)
592 if (max_power > 0 && tdp > max_power)
595 power_limit_1_val = power_limit_time_sec_to_msr[power_limit_1_time];
597 /* Set long term power limit to TDP */
599 limit.lo |= tdp & PKG_POWER_LIMIT_MASK;
600 limit.lo |= PKG_POWER_LIMIT_EN;
601 limit.lo |= (power_limit_1_val & PKG_POWER_LIMIT_TIME_MASK) <<
602 PKG_POWER_LIMIT_TIME_SHIFT;
604 /* Set short term power limit to 1.25 * TDP */
606 limit.hi |= ((tdp * 125) / 100) & PKG_POWER_LIMIT_MASK;
607 limit.hi |= PKG_POWER_LIMIT_EN;
608 /* Power limit 2 time is only programmable on server SKU */
610 msr_write(MSR_PKG_POWER_LIMIT, limit);
612 /* Set power limit values in MCHBAR as well */
613 writel(limit.lo, MCHBAR_REG(MCH_PKG_POWER_LIMIT_LO));
614 writel(limit.hi, MCHBAR_REG(MCH_PKG_POWER_LIMIT_HI));
616 /* Set DDR RAPL power limit by copying from MMIO to MSR */
617 msr.lo = readl(MCHBAR_REG(MCH_DDR_POWER_LIMIT_LO));
618 msr.hi = readl(MCHBAR_REG(MCH_DDR_POWER_LIMIT_HI));
619 msr_write(MSR_DDR_RAPL_LIMIT, msr);
621 /* Use nominal TDP values for CPUs with configurable TDP */
622 if (cpu_config_tdp_levels()) {
623 msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
625 limit.lo = msr.lo & 0xff;
626 msr_write(MSR_TURBO_ACTIVATION_RATIO, limit);
630 static int broadwell_get_info(const struct udevice *dev, struct cpu_info *info)
632 return cpu_intel_get_info(info, INTEL_BCLK_MHZ);
635 static int broadwell_get_count(const struct udevice *dev)
640 static int cpu_x86_broadwell_probe(struct udevice *dev)
642 if (dev_seq(dev) == 0) {
644 return broadwell_init(dev);
650 static const struct cpu_ops cpu_x86_broadwell_ops = {
651 .get_desc = cpu_x86_get_desc,
652 .get_info = broadwell_get_info,
653 .get_count = broadwell_get_count,
654 .get_vendor = cpu_x86_get_vendor,
657 static const struct udevice_id cpu_x86_broadwell_ids[] = {
658 { .compatible = "intel,core-i3-gen5" },
662 U_BOOT_DRIVER(cpu_x86_broadwell_drv) = {
663 .name = "cpu_x86_broadwell",
665 .of_match = cpu_x86_broadwell_ids,
666 .bind = cpu_x86_bind,
667 .probe = cpu_x86_broadwell_probe,
668 .ops = &cpu_x86_broadwell_ops,
669 .priv_auto = sizeof(struct cpu_broadwell_priv),
670 .flags = DM_FLAG_PRE_RELOC,