Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Pentium 4/Xeon CPU on demand clock modulation/speed scaling |
| 3 | * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> |
| 4 | * (C) 2002 Zwane Mwaikambo <zwane@commfireservices.com> |
| 5 | * (C) 2002 Arjan van de Ven <arjanv@redhat.com> |
| 6 | * (C) 2002 Tora T. Engstad |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version |
| 12 | * 2 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * The author(s) of this software shall not be held liable for damages |
| 15 | * of any nature resulting due to the use of this software. This |
| 16 | * software is provided AS-IS with no warranties. |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 17 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | * Date Errata Description |
| 19 | * 20020525 N44, O17 12.5% or 25% DC causes lockup |
| 20 | * |
| 21 | */ |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/kernel.h> |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 24 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/init.h> |
| 26 | #include <linux/smp.h> |
| 27 | #include <linux/cpufreq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/cpumask.h> |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 29 | #include <linux/timex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 31 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <asm/msr.h> |
Matthias-Christian Ott | 199785e | 2009-02-20 20:52:17 -0500 | [diff] [blame] | 33 | #include <asm/timer.h> |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 34 | #include <asm/cpu_device_id.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include "speedstep-lib.h" |
| 37 | |
| 38 | #define PFX "p4-clockmod: " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | /* |
| 41 | * Duty Cycle (3bits), note DC_DISABLE is not specified in |
| 42 | * intel docs i just use it to mean disable |
| 43 | */ |
| 44 | enum { |
| 45 | DC_RESV, DC_DFLT, DC_25PT, DC_38PT, DC_50PT, |
| 46 | DC_64PT, DC_75PT, DC_88PT, DC_DISABLE |
| 47 | }; |
| 48 | |
| 49 | #define DC_ENTRIES 8 |
| 50 | |
| 51 | |
| 52 | static int has_N44_O17_errata[NR_CPUS]; |
| 53 | static unsigned int stock_freq; |
| 54 | static struct cpufreq_driver p4clockmod_driver; |
| 55 | static unsigned int cpufreq_p4_get(unsigned int cpu); |
| 56 | |
| 57 | static int cpufreq_p4_setdc(unsigned int cpu, unsigned int newstate) |
| 58 | { |
| 59 | u32 l, h; |
| 60 | |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 61 | if (!cpu_online(cpu) || |
| 62 | (newstate > DC_DISABLE) || (newstate == DC_RESV)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | return -EINVAL; |
| 64 | |
Alexey Dobriyan | 551948b | 2007-03-19 19:17:00 +0300 | [diff] [blame] | 65 | rdmsr_on_cpu(cpu, MSR_IA32_THERM_STATUS, &l, &h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
| 67 | if (l & 0x01) |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 68 | pr_debug("CPU#%d currently thermal throttled\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 70 | if (has_N44_O17_errata[cpu] && |
| 71 | (newstate == DC_25PT || newstate == DC_DFLT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | newstate = DC_38PT; |
| 73 | |
Alexey Dobriyan | 551948b | 2007-03-19 19:17:00 +0300 | [diff] [blame] | 74 | rdmsr_on_cpu(cpu, MSR_IA32_THERM_CONTROL, &l, &h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | if (newstate == DC_DISABLE) { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 76 | pr_debug("CPU#%d disabling modulation\n", cpu); |
Alexey Dobriyan | 551948b | 2007-03-19 19:17:00 +0300 | [diff] [blame] | 77 | wrmsr_on_cpu(cpu, MSR_IA32_THERM_CONTROL, l & ~(1<<4), h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } else { |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 79 | pr_debug("CPU#%d setting duty cycle to %d%%\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | cpu, ((125 * newstate) / 10)); |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 81 | /* bits 63 - 5 : reserved |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | * bit 4 : enable/disable |
| 83 | * bits 3-1 : duty cycle |
| 84 | * bit 0 : reserved |
| 85 | */ |
| 86 | l = (l & ~14); |
| 87 | l = l | (1<<4) | ((newstate & 0x7)<<1); |
Alexey Dobriyan | 551948b | 2007-03-19 19:17:00 +0300 | [diff] [blame] | 88 | wrmsr_on_cpu(cpu, MSR_IA32_THERM_CONTROL, l, h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | |
| 95 | static struct cpufreq_frequency_table p4clockmod_table[] = { |
| 96 | {DC_RESV, CPUFREQ_ENTRY_INVALID}, |
| 97 | {DC_DFLT, 0}, |
| 98 | {DC_25PT, 0}, |
| 99 | {DC_38PT, 0}, |
| 100 | {DC_50PT, 0}, |
| 101 | {DC_64PT, 0}, |
| 102 | {DC_75PT, 0}, |
| 103 | {DC_88PT, 0}, |
| 104 | {DC_DISABLE, 0}, |
| 105 | {DC_RESV, CPUFREQ_TABLE_END}, |
| 106 | }; |
| 107 | |
| 108 | |
| 109 | static int cpufreq_p4_target(struct cpufreq_policy *policy, |
| 110 | unsigned int target_freq, |
| 111 | unsigned int relation) |
| 112 | { |
| 113 | unsigned int newstate = DC_RESV; |
| 114 | struct cpufreq_freqs freqs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | int i; |
| 116 | |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 117 | if (cpufreq_frequency_table_target(policy, &p4clockmod_table[0], |
| 118 | target_freq, relation, &newstate)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | return -EINVAL; |
| 120 | |
| 121 | freqs.old = cpufreq_p4_get(policy->cpu); |
| 122 | freqs.new = stock_freq * p4clockmod_table[newstate].index / 8; |
| 123 | |
| 124 | if (freqs.new == freqs.old) |
| 125 | return 0; |
| 126 | |
| 127 | /* notifiers */ |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame^] | 128 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 130 | /* run on each logical CPU, |
| 131 | * see section 13.15.3 of IA32 Intel Architecture Software |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 132 | * Developer's Manual, Volume 3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | */ |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 134 | for_each_cpu(i, policy->cpus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | cpufreq_p4_setdc(i, p4clockmod_table[newstate].index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | /* notifiers */ |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame^] | 138 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | |
| 144 | static int cpufreq_p4_verify(struct cpufreq_policy *policy) |
| 145 | { |
| 146 | return cpufreq_frequency_table_verify(policy, &p4clockmod_table[0]); |
| 147 | } |
| 148 | |
| 149 | |
| 150 | static unsigned int cpufreq_p4_get_frequency(struct cpuinfo_x86 *c) |
| 151 | { |
Dominik Brodowski | 4e74663 | 2006-10-31 12:44:08 -0500 | [diff] [blame] | 152 | if (c->x86 == 0x06) { |
| 153 | if (cpu_has(c, X86_FEATURE_EST)) |
Naga Chumbalkar | 853cee2 | 2011-02-15 17:44:11 +0000 | [diff] [blame] | 154 | printk_once(KERN_WARNING PFX "Warning: EST-capable " |
| 155 | "CPU detected. The acpi-cpufreq module offers " |
| 156 | "voltage scaling in addition to frequency " |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 157 | "scaling. You should use that instead of " |
| 158 | "p4-clockmod, if possible.\n"); |
Dominik Brodowski | 4e74663 | 2006-10-31 12:44:08 -0500 | [diff] [blame] | 159 | switch (c->x86_model) { |
| 160 | case 0x0E: /* Core */ |
| 161 | case 0x0F: /* Core Duo */ |
Herton Ronaldo Krzesinski | 8529154 | 2008-11-15 17:02:46 -0200 | [diff] [blame] | 162 | case 0x16: /* Celeron Core */ |
Jarod Wilson | 4319503 | 2009-03-06 20:24:57 +0000 | [diff] [blame] | 163 | case 0x1C: /* Atom */ |
Dominik Brodowski | 4e74663 | 2006-10-31 12:44:08 -0500 | [diff] [blame] | 164 | p4clockmod_driver.flags |= CPUFREQ_CONST_LOOPS; |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 165 | return speedstep_get_frequency(SPEEDSTEP_CPU_PCORE); |
Dominik Brodowski | 4e74663 | 2006-10-31 12:44:08 -0500 | [diff] [blame] | 166 | case 0x0D: /* Pentium M (Dothan) */ |
| 167 | p4clockmod_driver.flags |= CPUFREQ_CONST_LOOPS; |
| 168 | /* fall through */ |
| 169 | case 0x09: /* Pentium M (Banias) */ |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 170 | return speedstep_get_frequency(SPEEDSTEP_CPU_PM); |
Dominik Brodowski | 4e74663 | 2006-10-31 12:44:08 -0500 | [diff] [blame] | 171 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
| 173 | |
Dave Jones | 9d1f44e | 2010-08-03 13:47:30 -0400 | [diff] [blame] | 174 | if (c->x86 != 0xF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
| 177 | /* on P-4s, the TSC runs with constant frequency independent whether |
| 178 | * throttling is active or not. */ |
| 179 | p4clockmod_driver.flags |= CPUFREQ_CONST_LOOPS; |
| 180 | |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 181 | if (speedstep_detect_processor() == SPEEDSTEP_CPU_P4M) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | printk(KERN_WARNING PFX "Warning: Pentium 4-M detected. " |
| 183 | "The speedstep-ich or acpi cpufreq modules offer " |
| 184 | "voltage scaling in addition of frequency scaling. " |
| 185 | "You should use either one instead of p4-clockmod, " |
| 186 | "if possible.\n"); |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 187 | return speedstep_get_frequency(SPEEDSTEP_CPU_P4M); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | } |
| 189 | |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 190 | return speedstep_get_frequency(SPEEDSTEP_CPU_P4D); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | static int cpufreq_p4_cpu_init(struct cpufreq_policy *policy) |
| 196 | { |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 197 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | int cpuid = 0; |
| 199 | unsigned int i; |
| 200 | |
| 201 | #ifdef CONFIG_SMP |
Rusty Russell | 7ad728f | 2009-03-13 14:49:50 +1030 | [diff] [blame] | 202 | cpumask_copy(policy->cpus, cpu_sibling_mask(policy->cpu)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | #endif |
| 204 | |
| 205 | /* Errata workaround */ |
| 206 | cpuid = (c->x86 << 8) | (c->x86_model << 4) | c->x86_mask; |
| 207 | switch (cpuid) { |
| 208 | case 0x0f07: |
| 209 | case 0x0f0a: |
| 210 | case 0x0f11: |
| 211 | case 0x0f12: |
| 212 | has_N44_O17_errata[policy->cpu] = 1; |
Dominik Brodowski | 2d06d8c | 2011-03-27 15:04:46 +0200 | [diff] [blame] | 213 | pr_debug("has errata -- disabling low frequencies\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 215 | |
Matthias-Christian Ott | 199785e | 2009-02-20 20:52:17 -0500 | [diff] [blame] | 216 | if (speedstep_detect_processor() == SPEEDSTEP_CPU_P4D && |
| 217 | c->x86_model < 2) { |
| 218 | /* switch to maximum frequency and measure result */ |
| 219 | cpufreq_p4_setdc(policy->cpu, DC_DISABLE); |
| 220 | recalibrate_cpu_khz(); |
| 221 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | /* get max frequency */ |
| 223 | stock_freq = cpufreq_p4_get_frequency(c); |
| 224 | if (!stock_freq) |
| 225 | return -EINVAL; |
| 226 | |
| 227 | /* table init */ |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 228 | for (i = 1; (p4clockmod_table[i].frequency != CPUFREQ_TABLE_END); i++) { |
| 229 | if ((i < 2) && (has_N44_O17_errata[policy->cpu])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | p4clockmod_table[i].frequency = CPUFREQ_ENTRY_INVALID; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | else |
| 232 | p4clockmod_table[i].frequency = (stock_freq * i)/8; |
| 233 | } |
| 234 | cpufreq_frequency_table_get_attr(p4clockmod_table, policy->cpu); |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | /* cpuinfo and default policy values */ |
Dave Jones | 36e8abf | 2009-03-05 00:16:26 -0500 | [diff] [blame] | 237 | |
| 238 | /* the transition latency is set to be 1 higher than the maximum |
| 239 | * transition latency of the ondemand governor */ |
| 240 | policy->cpuinfo.transition_latency = 10000001; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | policy->cur = stock_freq; |
| 242 | |
| 243 | return cpufreq_frequency_table_cpuinfo(policy, &p4clockmod_table[0]); |
| 244 | } |
| 245 | |
| 246 | |
| 247 | static int cpufreq_p4_cpu_exit(struct cpufreq_policy *policy) |
| 248 | { |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 249 | cpufreq_frequency_table_put_attr(policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static unsigned int cpufreq_p4_get(unsigned int cpu) |
| 254 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | u32 l, h; |
| 256 | |
Alexey Dobriyan | 551948b | 2007-03-19 19:17:00 +0300 | [diff] [blame] | 257 | rdmsr_on_cpu(cpu, MSR_IA32_THERM_CONTROL, &l, &h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | if (l & 0x10) { |
| 260 | l = l >> 1; |
| 261 | l &= 0x7; |
| 262 | } else |
| 263 | l = DC_DISABLE; |
| 264 | |
| 265 | if (l != DC_DISABLE) |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 266 | return stock_freq * l / 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | return stock_freq; |
| 269 | } |
| 270 | |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 271 | static struct freq_attr *p4clockmod_attr[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | &cpufreq_freq_attr_scaling_available_freqs, |
| 273 | NULL, |
| 274 | }; |
| 275 | |
| 276 | static struct cpufreq_driver p4clockmod_driver = { |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 277 | .verify = cpufreq_p4_verify, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | .target = cpufreq_p4_target, |
| 279 | .init = cpufreq_p4_cpu_init, |
| 280 | .exit = cpufreq_p4_cpu_exit, |
| 281 | .get = cpufreq_p4_get, |
| 282 | .name = "p4-clockmod", |
| 283 | .owner = THIS_MODULE, |
| 284 | .attr = p4clockmod_attr, |
| 285 | }; |
| 286 | |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 287 | static const struct x86_cpu_id cpufreq_p4_id[] = { |
| 288 | { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_ACC }, |
| 289 | {} |
| 290 | }; |
| 291 | |
| 292 | /* |
| 293 | * Intentionally no MODULE_DEVICE_TABLE here: this driver should not |
| 294 | * be auto loaded. Please don't add one. |
| 295 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
| 297 | static int __init cpufreq_p4_init(void) |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 298 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | int ret; |
| 300 | |
| 301 | /* |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 302 | * THERM_CONTROL is architectural for IA32 now, so |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | * we can rely on the capability checks |
| 304 | */ |
Andi Kleen | fa8031a | 2012-01-26 00:09:12 +0100 | [diff] [blame] | 305 | if (!x86_match_cpu(cpufreq_p4_id) || !boot_cpu_has(X86_FEATURE_ACPI)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | return -ENODEV; |
| 307 | |
| 308 | ret = cpufreq_register_driver(&p4clockmod_driver); |
| 309 | if (!ret) |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 310 | printk(KERN_INFO PFX "P4/Xeon(TM) CPU On-Demand Clock " |
| 311 | "Modulation available\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 313 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | |
| 317 | static void __exit cpufreq_p4_exit(void) |
| 318 | { |
| 319 | cpufreq_unregister_driver(&p4clockmod_driver); |
| 320 | } |
| 321 | |
| 322 | |
Dave Jones | bbfebd6 | 2009-01-17 23:55:22 -0500 | [diff] [blame] | 323 | MODULE_AUTHOR("Zwane Mwaikambo <zwane@commfireservices.com>"); |
| 324 | MODULE_DESCRIPTION("cpufreq driver for Pentium(TM) 4/Xeon(TM)"); |
| 325 | MODULE_LICENSE("GPL"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | late_initcall(cpufreq_p4_init); |
| 328 | module_exit(cpufreq_p4_exit); |