Blame view
drivers/cpufreq/longrun.c
8.27 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 |
/* * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> * * Licensed under the terms of the GNU GPL License version 2. * * BIG FAT DISCLAIMER: Work in progress code. Possibly *dangerous* */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> |
1da177e4c Linux-2.6.12-rc2 |
12 |
#include <linux/cpufreq.h> |
48ee923a6 [CPUFREQ] checkpa... |
13 |
#include <linux/timex.h> |
1da177e4c Linux-2.6.12-rc2 |
14 15 16 |
#include <asm/msr.h> #include <asm/processor.h> |
fa8031aef cpufreq: Add supp... |
17 |
#include <asm/cpu_device_id.h> |
1da177e4c Linux-2.6.12-rc2 |
18 |
|
221dee285 Revert "[CPUFREQ]... |
19 |
static struct cpufreq_driver longrun_driver; |
1da177e4c Linux-2.6.12-rc2 |
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 |
/** * longrun_{low,high}_freq is needed for the conversion of cpufreq kHz * values into per cent values. In TMTA microcode, the following is valid: * performance_pctg = (current_freq - low_freq)/(high_freq - low_freq) */ static unsigned int longrun_low_freq, longrun_high_freq; /** * longrun_get_policy - get the current LongRun policy * @policy: struct cpufreq_policy where current policy is written into * * Reads the current LongRun policy by access to MSR_TMTA_LONGRUN_FLAGS * and MSR_TMTA_LONGRUN_CTRL */ |
2760984f6 cpufreq: delete _... |
36 |
static void longrun_get_policy(struct cpufreq_policy *policy) |
1da177e4c Linux-2.6.12-rc2 |
37 38 39 40 |
{ u32 msr_lo, msr_hi; rdmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi); |
2d06d8c49 [CPUFREQ] use dyn... |
41 42 |
pr_debug("longrun flags are %x - %x ", msr_lo, msr_hi); |
1da177e4c Linux-2.6.12-rc2 |
43 44 45 46 47 48 |
if (msr_lo & 0x01) policy->policy = CPUFREQ_POLICY_PERFORMANCE; else policy->policy = CPUFREQ_POLICY_POWERSAVE; rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi); |
2d06d8c49 [CPUFREQ] use dyn... |
49 50 |
pr_debug("longrun ctrl is %x - %x ", msr_lo, msr_hi); |
1da177e4c Linux-2.6.12-rc2 |
51 52 |
msr_lo &= 0x0000007F; msr_hi &= 0x0000007F; |
48ee923a6 [CPUFREQ] checkpa... |
53 |
if (longrun_high_freq <= longrun_low_freq) { |
1da177e4c Linux-2.6.12-rc2 |
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 |
/* Assume degenerate Longrun table */ policy->min = policy->max = longrun_high_freq; } else { policy->min = longrun_low_freq + msr_lo * ((longrun_high_freq - longrun_low_freq) / 100); policy->max = longrun_low_freq + msr_hi * ((longrun_high_freq - longrun_low_freq) / 100); } policy->cpu = 0; } /** * longrun_set_policy - sets a new CPUFreq policy * @policy: new policy * * Sets a new CPUFreq policy on LongRun-capable processors. This function * has to be called with cpufreq_driver locked. */ static int longrun_set_policy(struct cpufreq_policy *policy) { u32 msr_lo, msr_hi; u32 pctg_lo, pctg_hi; if (!policy) return -EINVAL; |
48ee923a6 [CPUFREQ] checkpa... |
80 |
if (longrun_high_freq <= longrun_low_freq) { |
1da177e4c Linux-2.6.12-rc2 |
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 |
/* Assume degenerate Longrun table */ pctg_lo = pctg_hi = 100; } else { pctg_lo = (policy->min - longrun_low_freq) / ((longrun_high_freq - longrun_low_freq) / 100); pctg_hi = (policy->max - longrun_low_freq) / ((longrun_high_freq - longrun_low_freq) / 100); } if (pctg_hi > 100) pctg_hi = 100; if (pctg_lo > pctg_hi) pctg_lo = pctg_hi; /* performance or economy mode */ rdmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi); msr_lo &= 0xFFFFFFFE; switch (policy->policy) { case CPUFREQ_POLICY_PERFORMANCE: msr_lo |= 0x00000001; break; case CPUFREQ_POLICY_POWERSAVE: break; } wrmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi); /* lower and upper boundary */ rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi); msr_lo &= 0xFFFFFF80; msr_hi &= 0xFFFFFF80; msr_lo |= pctg_lo; msr_hi |= pctg_hi; wrmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi); return 0; } /** * longrun_verify_poliy - verifies a new CPUFreq policy * @policy: the policy to verify * * Validates a new CPUFreq policy. This function has to be called with * cpufreq_driver locked. */ static int longrun_verify_policy(struct cpufreq_policy *policy) { if (!policy) return -EINVAL; policy->cpu = 0; |
be49e3465 cpufreq: add new ... |
132 |
cpufreq_verify_within_cpu_limits(policy); |
1da177e4c Linux-2.6.12-rc2 |
133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 |
if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) && (policy->policy != CPUFREQ_POLICY_PERFORMANCE)) return -EINVAL; return 0; } static unsigned int longrun_get(unsigned int cpu) { u32 eax, ebx, ecx, edx; if (cpu) return 0; cpuid(0x80860007, &eax, &ebx, &ecx, &edx); |
2d06d8c49 [CPUFREQ] use dyn... |
149 150 |
pr_debug("cpuid eax is %u ", eax); |
1da177e4c Linux-2.6.12-rc2 |
151 |
|
48ee923a6 [CPUFREQ] checkpa... |
152 |
return eax * 1000; |
1da177e4c Linux-2.6.12-rc2 |
153 154 155 156 157 158 159 160 161 162 163 164 |
} /** * longrun_determine_freqs - determines the lowest and highest possible core frequency * @low_freq: an int to put the lowest frequency into * @high_freq: an int to put the highest frequency into * * Determines the lowest and highest possible core frequencies on this CPU. * This is necessary to calculate the performance percentage according to * TMTA rules: * performance_pctg = (target_freq - low_freq)/(high_freq - low_freq) */ |
2760984f6 cpufreq: delete _... |
165 |
static int longrun_determine_freqs(unsigned int *low_freq, |
7e2d81122 [CPUFREQ] Fix sec... |
166 |
unsigned int *high_freq) |
1da177e4c Linux-2.6.12-rc2 |
167 168 169 170 171 |
{ u32 msr_lo, msr_hi; u32 save_lo, save_hi; u32 eax, ebx, ecx, edx; u32 try_hi; |
92cb7612a x86: convert cpui... |
172 |
struct cpuinfo_x86 *c = &cpu_data(0); |
1da177e4c Linux-2.6.12-rc2 |
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 |
if (!low_freq || !high_freq) return -EINVAL; if (cpu_has(c, X86_FEATURE_LRTI)) { /* if the LongRun Table Interface is present, the * detection is a bit easier: * For minimum frequency, read out the maximum * level (msr_hi), write that into "currently * selected level", and read out the frequency. * For maximum frequency, read out level zero. */ /* minimum */ rdmsr(MSR_TMTA_LRTI_READOUT, msr_lo, msr_hi); wrmsr(MSR_TMTA_LRTI_READOUT, msr_hi, msr_hi); rdmsr(MSR_TMTA_LRTI_VOLT_MHZ, msr_lo, msr_hi); *low_freq = msr_lo * 1000; /* to kHz */ /* maximum */ wrmsr(MSR_TMTA_LRTI_READOUT, 0, msr_hi); rdmsr(MSR_TMTA_LRTI_VOLT_MHZ, msr_lo, msr_hi); *high_freq = msr_lo * 1000; /* to kHz */ |
2d06d8c49 [CPUFREQ] use dyn... |
195 196 |
pr_debug("longrun table interface told %u - %u kHz ", |
48ee923a6 [CPUFREQ] checkpa... |
197 |
*low_freq, *high_freq); |
1da177e4c Linux-2.6.12-rc2 |
198 199 200 201 202 203 204 205 206 |
if (*low_freq > *high_freq) *low_freq = *high_freq; return 0; } /* set the upper border to the value determined during TSC init */ *high_freq = (cpu_khz / 1000); *high_freq = *high_freq * 1000; |
2d06d8c49 [CPUFREQ] use dyn... |
207 208 |
pr_debug("high frequency is %u kHz ", *high_freq); |
1da177e4c Linux-2.6.12-rc2 |
209 210 211 212 213 214 215 216 217 218 219 220 |
/* get current borders */ rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi); save_lo = msr_lo & 0x0000007F; save_hi = msr_hi & 0x0000007F; /* if current perf_pctg is larger than 90%, we need to decrease the * upper limit to make the calculation more accurate. */ cpuid(0x80860007, &eax, &ebx, &ecx, &edx); /* try decreasing in 10% steps, some processors react only * on some barrier values */ |
48ee923a6 [CPUFREQ] checkpa... |
221 |
for (try_hi = 80; try_hi > 0 && ecx > 90; try_hi -= 10) { |
1da177e4c Linux-2.6.12-rc2 |
222 223 224 |
/* set to 0 to try_hi perf_pctg */ msr_lo &= 0xFFFFFF80; msr_hi &= 0xFFFFFF80; |
1da177e4c Linux-2.6.12-rc2 |
225 226 227 228 229 230 231 232 233 |
msr_hi |= try_hi; wrmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi); /* read out current core MHz and current perf_pctg */ cpuid(0x80860007, &eax, &ebx, &ecx, &edx); /* restore values */ wrmsr(MSR_TMTA_LONGRUN_CTRL, save_lo, save_hi); } |
2d06d8c49 [CPUFREQ] use dyn... |
234 235 |
pr_debug("percentage is %u %%, freq is %u MHz ", ecx, eax); |
1da177e4c Linux-2.6.12-rc2 |
236 237 238 |
/* performance_pctg = (current_freq - low_freq)/(high_freq - low_freq) * eqals |
48ee923a6 [CPUFREQ] checkpa... |
239 |
* low_freq * (1 - perf_pctg) = (cur_freq - high_freq * perf_pctg) |
1da177e4c Linux-2.6.12-rc2 |
240 241 242 243 244 245 246 |
* * high_freq * perf_pctg is stored tempoarily into "ebx". */ ebx = (((cpu_khz / 1000) * ecx) / 100); /* to MHz */ if ((ecx > 95) || (ecx == 0) || (eax < ebx)) return -EIO; |
667ad4f70 [CPUFREQ] Crusoe:... |
247 |
edx = ((eax - ebx) * 100) / (100 - ecx); |
1da177e4c Linux-2.6.12-rc2 |
248 |
*low_freq = edx * 1000; /* back to kHz */ |
2d06d8c49 [CPUFREQ] use dyn... |
249 250 |
pr_debug("low frequency is %u kHz ", *low_freq); |
1da177e4c Linux-2.6.12-rc2 |
251 252 253 254 255 256 |
if (*low_freq > *high_freq) *low_freq = *high_freq; return 0; } |
2760984f6 cpufreq: delete _... |
257 |
static int longrun_cpu_init(struct cpufreq_policy *policy) |
1da177e4c Linux-2.6.12-rc2 |
258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 |
{ int result = 0; /* capability check */ if (policy->cpu != 0) return -ENODEV; /* detect low and high frequency */ result = longrun_determine_freqs(&longrun_low_freq, &longrun_high_freq); if (result) return result; /* cpuinfo and default policy values */ policy->cpuinfo.min_freq = longrun_low_freq; policy->cpuinfo.max_freq = longrun_high_freq; policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; longrun_get_policy(policy); return 0; } |
221dee285 Revert "[CPUFREQ]... |
278 |
static struct cpufreq_driver longrun_driver = { |
1da177e4c Linux-2.6.12-rc2 |
279 280 281 282 283 284 |
.flags = CPUFREQ_CONST_LOOPS, .verify = longrun_verify_policy, .setpolicy = longrun_set_policy, .get = longrun_get, .init = longrun_cpu_init, .name = "longrun", |
1da177e4c Linux-2.6.12-rc2 |
285 |
}; |
fa8031aef cpufreq: Add supp... |
286 287 288 289 290 291 |
static const struct x86_cpu_id longrun_ids[] = { { X86_VENDOR_TRANSMETA, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_LONGRUN }, {} }; MODULE_DEVICE_TABLE(x86cpu, longrun_ids); |
1da177e4c Linux-2.6.12-rc2 |
292 293 294 295 296 297 298 299 |
/** * longrun_init - initializes the Transmeta Crusoe LongRun CPUFreq driver * * Initializes the LongRun support. */ static int __init longrun_init(void) { |
fa8031aef cpufreq: Add supp... |
300 |
if (!x86_match_cpu(longrun_ids)) |
1da177e4c Linux-2.6.12-rc2 |
301 |
return -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
302 303 304 305 306 307 308 309 310 311 312 |
return cpufreq_register_driver(&longrun_driver); } /** * longrun_exit - unregisters LongRun support */ static void __exit longrun_exit(void) { cpufreq_unregister_driver(&longrun_driver); } |
48ee923a6 [CPUFREQ] checkpa... |
313 314 315 316 |
MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); MODULE_DESCRIPTION("LongRun driver for Transmeta Crusoe and " "Efficeon processors."); MODULE_LICENSE("GPL"); |
1da177e4c Linux-2.6.12-rc2 |
317 318 319 |
module_init(longrun_init); module_exit(longrun_exit); |