2 * This file is part of the coreboot project.
4 * Copyright (C) 2009 coresystems GmbH
5 * Copyright (C) 2011 The Chromium OS Authors. All rights reserved.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; version 2 of
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
24 #include <console/console.h>
25 #include <arch/acpi.h>
26 #include <arch/acpigen.h>
28 #include <cpu/x86/msr.h>
29 #include <cpu/intel/acpi.h>
30 #include <cpu/intel/speedstep.h>
31 #include <cpu/intel/turbo.h>
32 #include <device/device.h>
33 #include <device/pci.h>
34 #include "model_206ax.h"
37 static int get_cores_per_package(void)
40 struct cpuid_result result;
43 get_fms(&c, cpuid_eax(1));
47 switch (c.x86_model) {
48 case CONFIG_CPU_MODEL_INDEX:
49 result = cpuid_ext(0xb, 1);
50 cores = result.ebx & 0xff;
53 cores = (cpuid_ebx(1) >> 16) & 0xff;
60 static int generate_cstate_entries(acpi_cstate_t *cstates,
61 int c1, int c2, int c3)
63 int length, cstate_count = 0;
65 /* Count number of active C-states */
75 length = acpigen_write_package(cstate_count + 1);
76 length += acpigen_write_byte(cstate_count);
78 /* Add an entry if the level is enabled */
80 length += acpigen_write_CST_package(1, &cstates[c1]);
82 length += acpigen_write_CST_package(2, &cstates[c2]);
84 length += acpigen_write_CST_package(3, &cstates[c3]);
86 acpigen_patch_len(length - 1);
90 static int generate_C_state_entries(void)
92 struct cpu_info *info;
93 struct cpu_driver *cpu;
96 struct cpu_intel_model_206ax_config *conf = NULL;
98 /* Find the SpeedStep CPU in the device tree using magic APIC ID */
99 lapic = dev_find_lapic(SPEEDSTEP_APIC_MAGIC);
102 conf = lapic->chip_info;
106 /* Find CPU map of supported C-states */
110 cpu = find_cpu_driver(info->cpu);
111 if (!cpu || !cpu->cstates)
114 len = acpigen_emit_byte(0x14); /* MethodOp */
115 len += acpigen_write_len_f(); /* PkgLength */
116 len += acpigen_emit_namestring("_CST");
117 len += acpigen_emit_byte(0x00); /* No Arguments */
119 /* If running on AC power */
120 len += acpigen_emit_byte(0xa0); /* IfOp */
121 lenif = acpigen_write_len_f(); /* PkgLength */
122 lenif += acpigen_emit_namestring("PWRS");
123 lenif += acpigen_emit_byte(0xa4); /* ReturnOp */
124 lenif += generate_cstate_entries(cpu->cstates, conf->c1_acpower,
125 conf->c2_acpower, conf->c3_acpower);
126 acpigen_patch_len(lenif - 1);
129 /* Else on battery power */
130 len += acpigen_emit_byte(0xa4); /* ReturnOp */
131 len += generate_cstate_entries(cpu->cstates, conf->c1_battery,
132 conf->c2_battery, conf->c3_battery);
133 acpigen_patch_len(len - 1);
137 static acpi_tstate_t tss_table_fine[] = {
138 { 100, 1000, 0, 0x00, 0 },
139 { 94, 940, 0, 0x1f, 0 },
140 { 88, 880, 0, 0x1e, 0 },
141 { 82, 820, 0, 0x1d, 0 },
142 { 75, 760, 0, 0x1c, 0 },
143 { 69, 700, 0, 0x1b, 0 },
144 { 63, 640, 0, 0x1a, 0 },
145 { 57, 580, 0, 0x19, 0 },
146 { 50, 520, 0, 0x18, 0 },
147 { 44, 460, 0, 0x17, 0 },
148 { 38, 400, 0, 0x16, 0 },
149 { 32, 340, 0, 0x15, 0 },
150 { 25, 280, 0, 0x14, 0 },
151 { 19, 220, 0, 0x13, 0 },
152 { 13, 160, 0, 0x12, 0 },
155 static acpi_tstate_t tss_table_coarse[] = {
156 { 100, 1000, 0, 0x00, 0 },
157 { 88, 875, 0, 0x1f, 0 },
158 { 75, 750, 0, 0x1e, 0 },
159 { 63, 625, 0, 0x1d, 0 },
160 { 50, 500, 0, 0x1c, 0 },
161 { 38, 375, 0, 0x1b, 0 },
162 { 25, 250, 0, 0x1a, 0 },
163 { 13, 125, 0, 0x19, 0 },
166 static int generate_T_state_entries(int core, int cores_per_package)
170 /* Indicate SW_ALL coordination for T-states */
171 len = acpigen_write_TSD_package(core, cores_per_package, SW_ALL);
173 /* Indicate FFixedHW so OS will use MSR */
174 len += acpigen_write_empty_PTC();
176 /* Set a T-state limit that can be modified in NVS */
177 len += acpigen_write_TPC("\\TLVL");
180 * CPUID.(EAX=6):EAX[5] indicates support
181 * for extended throttle levels.
183 if (cpuid_eax(6) & (1 << 5))
184 len += acpigen_write_TSS_package(
185 ARRAY_SIZE(tss_table_fine), tss_table_fine);
187 len += acpigen_write_TSS_package(
188 ARRAY_SIZE(tss_table_coarse), tss_table_coarse);
193 static int calculate_power(int tdp, int p1_ratio, int ratio)
199 * M = ((1.1 - ((p1_ratio - ratio) * 0.00625)) / 1.1) ^ 2
201 * Power = (ratio / p1_ratio) * m * tdp
204 m = (110000 - ((p1_ratio - ratio) * 625)) / 11;
207 power = ((ratio * 100000 / p1_ratio) / 100);
208 power *= (m / 100) * (tdp / 1000);
214 static int generate_P_state_entries(int core, int cores_per_package)
217 int ratio_min, ratio_max, ratio_turbo, ratio_step;
218 int coord_type, power_max, power_unit, num_entries;
219 int ratio, power, clock, clock_max;
222 /* Determine P-state coordination type from MISC_PWR_MGMT[0] */
223 msr = rdmsr(MSR_MISC_PWR_MGMT);
224 if (msr.lo & MISC_PWR_MGMT_EIST_HW_DIS)
229 /* Get bus ratio limits and calculate clock speeds */
230 msr = rdmsr(MSR_PLATFORM_INFO);
231 ratio_min = (msr.hi >> (40-32)) & 0xff; /* Max Efficiency Ratio */
232 ratio_max = (msr.lo >> 8) & 0xff; /* Max Non-Turbo Ratio */
233 clock_max = ratio_max * SANDYBRIDGE_BCLK;
235 /* Calculate CPU TDP in mW */
236 msr = rdmsr(MSR_PKG_POWER_SKU_UNIT);
237 power_unit = 2 << ((msr.lo & 0xf) - 1);
238 msr = rdmsr(MSR_PKG_POWER_SKU);
239 power_max = ((msr.lo & 0x7fff) / power_unit) * 1000;
241 /* Write _PCT indicating use of FFixedHW */
242 len = acpigen_write_empty_PCT();
244 /* Write _PPC with no limit on supported P-state */
245 len += acpigen_write_PPC(0);
247 /* Write PSD indicating configured coordination type */
248 len += acpigen_write_PSD_package(core, cores_per_package, coord_type);
250 /* Add P-state entries in _PSS table */
251 len += acpigen_write_name("_PSS");
253 /* Determine ratio points */
254 ratio_step = PSS_RATIO_STEP;
255 num_entries = (ratio_max - ratio_min) / ratio_step;
256 while (num_entries > PSS_MAX_ENTRIES-1) {
261 /* P[T] is Turbo state if enabled */
262 if (get_turbo_state() == TURBO_ENABLED) {
263 /* _PSS package count including Turbo */
264 len_pss = acpigen_write_package(num_entries + 2);
266 msr = rdmsr(MSR_TURBO_RATIO_LIMIT);
267 ratio_turbo = msr.lo & 0xff;
269 /* Add entry for Turbo ratio */
270 len_pss += acpigen_write_PSS_package(
271 clock_max + 1, /*MHz*/
273 PSS_LATENCY_TRANSITION, /*lat1*/
274 PSS_LATENCY_BUSMASTER, /*lat2*/
275 ratio_turbo << 8, /*control*/
276 ratio_turbo << 8); /*status*/
278 /* _PSS package count without Turbo */
279 len_pss = acpigen_write_package(num_entries + 1);
282 /* First regular entry is max non-turbo ratio */
283 len_pss += acpigen_write_PSS_package(
286 PSS_LATENCY_TRANSITION, /*lat1*/
287 PSS_LATENCY_BUSMASTER, /*lat2*/
288 ratio_max << 8, /*control*/
289 ratio_max << 8); /*status*/
291 /* Generate the remaining entries */
292 for (ratio = ratio_min + ((num_entries - 1) * ratio_step);
293 ratio >= ratio_min; ratio -= ratio_step) {
295 /* Calculate power at this ratio */
296 power = calculate_power(power_max, ratio_max, ratio);
297 clock = ratio * SANDYBRIDGE_BCLK;
299 len_pss += acpigen_write_PSS_package(
302 PSS_LATENCY_TRANSITION, /*lat1*/
303 PSS_LATENCY_BUSMASTER, /*lat2*/
304 ratio << 8, /*control*/
305 ratio << 8); /*status*/
308 /* Fix package length */
310 acpigen_patch_len(len_pss);
312 return len + len_pss;
315 void generate_cpu_entries(void)
318 int coreID, cpuID, pcontrol_blk = PMB0_BASE, plen = 6;
319 int totalcores = dev_count_cpu();
320 int cores_per_package = get_cores_per_package();
321 int numcpus = totalcores/cores_per_package;
323 printk(BIOS_DEBUG, "Found %d CPU(s) with %d core(s) each.\n",
324 numcpus, cores_per_package);
326 for (cpuID=1; cpuID <=numcpus; cpuID++) {
327 for (coreID=1; coreID<=cores_per_package; coreID++) {
333 /* Generate processor \_PR.CPUx */
334 len_pr = acpigen_write_processor(
335 (cpuID-1)*cores_per_package+coreID-1,
338 /* Generate P-state tables */
339 len_pr += generate_P_state_entries(
340 cpuID-1, cores_per_package);
342 /* Generate C-state tables */
343 len_pr += generate_C_state_entries();
345 /* Generate T-state tables */
346 len_pr += generate_T_state_entries(
347 cpuID-1, cores_per_package);
350 acpigen_patch_len(len_pr);
355 struct chip_operations cpu_intel_model_206ax_ops = {
356 CHIP_NAME(CONFIG_CPU_MODEL_NAME)