Release 4.7 drivers/cpufreq/longrun.c

/*
 * (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>
#include <asm/cpu_device_id.h>


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 longrun_get_policy(struct cpufreq_policy *policy)
{
	u32 msr_lo, msr_hi;

	rdmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi);
	pr_debug("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);
	pr_debug("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;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
dominik brodowski
dominik brodowski
104
72.73%
2
40.00%
dave jones
dave jones
39
27.27%
3
60.00%
Total
143
100.00%
5
100.00%

/**
 * 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;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
dominik brodowski
dominik brodowski
171
90.48%
2
66.67%
dave jones
dave jones
18
9.52%
1
33.33%
Total
189
100.00%
3
100.00%

/**
 * 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_cpu_limits(policy);

	if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) &&
	    (policy->policy != CPUFREQ_POLICY_PERFORMANCE))
		return -EINVAL;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
dominik brodowski
dominik brodowski
39
69.64%
3
50.00%
dave jones
dave jones
16
28.57%
2
33.33%
viresh kumar
viresh kumar
1
1.79%
1
16.67%
Total
56
100.00%
6
100.00%



static unsigned int longrun_get(unsigned int cpu)
{
	u32 eax, ebx, ecx, edx;

	if (cpu)
		return 0;

	cpuid(0x80860007, &eax, &ebx, &ecx, &edx);
	pr_debug("cpuid eax is %u\n", eax);

	return eax * 1000;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
dave jones
dave jones
55
98.21%
2
66.67%
dominik brodowski
dominik brodowski
1
1.79%
1
33.33%
Total
56
100.00%
3
100.00%

/**
 * 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 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 */

		pr_debug("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;
	pr_debug("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);
	}
	pr_debug("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 */

	pr_debug("low frequency is %u kHz\n", *low_freq);

	if (*low_freq > *high_freq)
		*low_freq = *high_freq;

	return 0;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
dominik brodowski
dominik brodowski
340
84.37%
2
25.00%
dave jones
dave jones
55
13.65%
4
50.00%
maximilian attems
maximilian attems
4
0.99%
1
12.50%
mike travis
mike travis
4
0.99%
1
12.50%
Total
403
100.00%
8
100.00%



static int 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;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
dominik brodowski
dominik brodowski
81
100.00%
3
100.00%
Total
81
100.00%
3
100.00%


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",
};


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);

/**
 * longrun_init - initializes the Transmeta Crusoe LongRun CPUFreq driver
 *
 * Initializes the LongRun support.
 */


static int __init longrun_init(void)
{
	if (!x86_match_cpu(longrun_ids))
		return -ENODEV;
	return cpufreq_register_driver(&longrun_driver);
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
dominik brodowski
dominik brodowski
26
92.86%
2
66.67%
andi kleen
andi kleen
2
7.14%
1
33.33%
Total
28
100.00%
3
100.00%

/**
 * longrun_exit - unregisters LongRun support
 */


static void __exit longrun_exit(void)
{
	cpufreq_unregister_driver(&longrun_driver);
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
dominik brodowski
dominik brodowski
15
100.00%
2
100.00%
Total
15
100.00%
2
100.00%

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);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
dominik brodowski
dominik brodowski
861
77.85%
5
25.00%
dave jones
dave jones
203
18.35%
11
55.00%
andi kleen
andi kleen
33
2.98%
1
5.00%
maximilian attems
maximilian attems
4
0.36%
1
5.00%
mike travis
mike travis
4
0.36%
1
5.00%
viresh kumar
viresh kumar
1
0.09%
1
5.00%
Total
1106
100.00%
20
100.00%
  
Directory: drivers/cpufreq

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.