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path: root/arch/x86/kernel/cpu/cpufreq/longrun.c
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Diffstat (limited to 'arch/x86/kernel/cpu/cpufreq/longrun.c')
-rw-r--r--arch/x86/kernel/cpu/cpufreq/longrun.c327
1 files changed, 0 insertions, 327 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/longrun.c b/arch/x86/kernel/cpu/cpufreq/longrun.c
deleted file mode 100644
index d9f51367666b..000000000000
--- a/arch/x86/kernel/cpu/cpufreq/longrun.c
+++ /dev/null
@@ -1,327 +0,0 @@
-/*
- * (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>
-#include <linux/cpufreq.h>
-#include <linux/timex.h>
-
-#include <asm/msr.h>
-#include <asm/processor.h>
-
-#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \
- "longrun", msg)
-
-static struct cpufreq_driver longrun_driver;
-
-/**
- * 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
- */
-static void __cpuinit longrun_get_policy(struct cpufreq_policy *policy)
-{
- u32 msr_lo, msr_hi;
-
- rdmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi);
- dprintk("longrun flags are %x - %x\n", msr_lo, msr_hi);
- if (msr_lo & 0x01)
- policy->policy = CPUFREQ_POLICY_PERFORMANCE;
- else
- policy->policy = CPUFREQ_POLICY_POWERSAVE;
-
- rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi);
- dprintk("longrun ctrl is %x - %x\n", msr_lo, msr_hi);
- msr_lo &= 0x0000007F;
- msr_hi &= 0x0000007F;
-
- if (longrun_high_freq <= longrun_low_freq) {
- /* 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;
-
- if (longrun_high_freq <= longrun_low_freq) {
- /* 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;
- cpufreq_verify_within_limits(policy,
- policy->cpuinfo.min_freq,
- policy->cpuinfo.max_freq);
-
- 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);
- dprintk("cpuid eax is %u\n", eax);
-
- return eax * 1000;
-}
-
-/**
- * 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)
- */
-static int __cpuinit longrun_determine_freqs(unsigned int *low_freq,
- unsigned int *high_freq)
-{
- u32 msr_lo, msr_hi;
- u32 save_lo, save_hi;
- u32 eax, ebx, ecx, edx;
- u32 try_hi;
- struct cpuinfo_x86 *c = &cpu_data(0);
-
- 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 */
-
- dprintk("longrun table interface told %u - %u kHz\n",
- *low_freq, *high_freq);
-
- 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;
- dprintk("high frequency is %u kHz\n", *high_freq);
-
- /* 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 */
- for (try_hi = 80; try_hi > 0 && ecx > 90; try_hi -= 10) {
- /* set to 0 to try_hi perf_pctg */
- msr_lo &= 0xFFFFFF80;
- msr_hi &= 0xFFFFFF80;
- 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);
- }
- dprintk("percentage is %u %%, freq is %u MHz\n", ecx, eax);
-
- /* performance_pctg = (current_freq - low_freq)/(high_freq - low_freq)
- * eqals
- * low_freq * (1 - perf_pctg) = (cur_freq - high_freq * perf_pctg)
- *
- * 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;
-
- edx = ((eax - ebx) * 100) / (100 - ecx);
- *low_freq = edx * 1000; /* back to kHz */
-
- dprintk("low frequency is %u kHz\n", *low_freq);
-
- if (*low_freq > *high_freq)
- *low_freq = *high_freq;
-
- return 0;
-}
-
-
-static int __cpuinit longrun_cpu_init(struct cpufreq_policy *policy)
-{
- 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;
-}
-
-
-static struct cpufreq_driver longrun_driver = {
- .flags = CPUFREQ_CONST_LOOPS,
- .verify = longrun_verify_policy,
- .setpolicy = longrun_set_policy,
- .get = longrun_get,
- .init = longrun_cpu_init,
- .name = "longrun",
- .owner = THIS_MODULE,
-};
-
-
-/**
- * longrun_init - initializes the Transmeta Crusoe LongRun CPUFreq driver
- *
- * Initializes the LongRun support.
- */
-static int __init longrun_init(void)
-{
- struct cpuinfo_x86 *c = &cpu_data(0);
-
- if (c->x86_vendor != X86_VENDOR_TRANSMETA ||
- !cpu_has(c, X86_FEATURE_LONGRUN))
- return -ENODEV;
-
- return cpufreq_register_driver(&longrun_driver);
-}
-
-
-/**
- * longrun_exit - unregisters LongRun support
- */
-static void __exit longrun_exit(void)
-{
- cpufreq_unregister_driver(&longrun_driver);
-}
-
-
-MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
-MODULE_DESCRIPTION("LongRun driver for Transmeta Crusoe and "
- "Efficeon processors.");
-MODULE_LICENSE("GPL");
-
-module_init(longrun_init);
-module_exit(longrun_exit);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-26 20:05:20 +0300