[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / 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 __cpuinit 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;
}


/**
 * 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);
	pr_debug("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 */

		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;
}


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,
};

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);
}


/**
 * 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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
	3	*
	4	* Licensed under the terms of the GNU GPL License version 2.
	5	*
	6	* BIG FAT DISCLAIMER: Work in progress code. Possibly dangerous
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
	11	#include <linux/init.h>
1da177e4	12	#include <linux/cpufreq.h>
48ee923a	13	#include <linux/timex.h>
1da177e4 LT	14
	15	#include <asm/msr.h>
	16	#include <asm/processor.h>
fa8031ae	17	#include <asm/cpu_device_id.h>
1da177e4	18
221dee28	19	static struct cpufreq_driver longrun_driver;
1da177e4 LT	20
	21	/**
	22	* longrun_{low,high}_freq is needed for the conversion of cpufreq kHz
	23	* values into per cent values. In TMTA microcode, the following is valid:
	24	* performance_pctg = (current_freq - low_freq)/(high_freq - low_freq)
	25	*/
	26	static unsigned int longrun_low_freq, longrun_high_freq;
	27
	28
	29	/**
	30	* longrun_get_policy - get the current LongRun policy
	31	* @policy: struct cpufreq_policy where current policy is written into
	32	*
	33	* Reads the current LongRun policy by access to MSR_TMTA_LONGRUN_FLAGS
	34	* and MSR_TMTA_LONGRUN_CTRL
	35	*/
a69a0612	36	static void __cpuinit longrun_get_policy(struct cpufreq_policy *policy)
1da177e4 LT	37	{
	38	u32 msr_lo, msr_hi;
	39
	40	rdmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi);
2d06d8c4	41	pr_debug("longrun flags are %x - %x\n", msr_lo, msr_hi);
1da177e4 LT	42	if (msr_lo & 0x01)
	43	policy->policy = CPUFREQ_POLICY_PERFORMANCE;
	44	else
	45	policy->policy = CPUFREQ_POLICY_POWERSAVE;
	46
	47	rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi);
2d06d8c4	48	pr_debug("longrun ctrl is %x - %x\n", msr_lo, msr_hi);
1da177e4 LT	49	msr_lo &= 0x0000007F;
	50	msr_hi &= 0x0000007F;
	51
48ee923a	52	if (longrun_high_freq <= longrun_low_freq) {
1da177e4 LT	53	/* Assume degenerate Longrun table */
	54	policy->min = policy->max = longrun_high_freq;
	55	} else {
	56	policy->min = longrun_low_freq + msr_lo *
	57	((longrun_high_freq - longrun_low_freq) / 100);
	58	policy->max = longrun_low_freq + msr_hi *
	59	((longrun_high_freq - longrun_low_freq) / 100);
	60	}
	61	policy->cpu = 0;
	62	}
	63
	64
	65	/**
	66	* longrun_set_policy - sets a new CPUFreq policy
	67	* @policy: new policy
	68	*
	69	* Sets a new CPUFreq policy on LongRun-capable processors. This function
	70	* has to be called with cpufreq_driver locked.
	71	*/
	72	static int longrun_set_policy(struct cpufreq_policy *policy)
	73	{
	74	u32 msr_lo, msr_hi;
	75	u32 pctg_lo, pctg_hi;
	76
	77	if (!policy)
	78	return -EINVAL;
	79
48ee923a	80	if (longrun_high_freq <= longrun_low_freq) {
1da177e4 LT	81	/* Assume degenerate Longrun table */
	82	pctg_lo = pctg_hi = 100;
	83	} else {
	84	pctg_lo = (policy->min - longrun_low_freq) /
	85	((longrun_high_freq - longrun_low_freq) / 100);
	86	pctg_hi = (policy->max - longrun_low_freq) /
	87	((longrun_high_freq - longrun_low_freq) / 100);
	88	}
	89
	90	if (pctg_hi > 100)
	91	pctg_hi = 100;
	92	if (pctg_lo > pctg_hi)
	93	pctg_lo = pctg_hi;
	94
	95	/* performance or economy mode */
	96	rdmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi);
	97	msr_lo &= 0xFFFFFFFE;
	98	switch (policy->policy) {
	99	case CPUFREQ_POLICY_PERFORMANCE:
	100	msr_lo \|= 0x00000001;
	101	break;
	102	case CPUFREQ_POLICY_POWERSAVE:
	103	break;
	104	}
	105	wrmsr(MSR_TMTA_LONGRUN_FLAGS, msr_lo, msr_hi);
	106
	107	/* lower and upper boundary */
	108	rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi);
	109	msr_lo &= 0xFFFFFF80;
	110	msr_hi &= 0xFFFFFF80;
	111	msr_lo \|= pctg_lo;
	112	msr_hi \|= pctg_hi;
	113	wrmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi);
	114
	115	return 0;
	116	}
	117
	118
	119	/**
	120	* longrun_verify_poliy - verifies a new CPUFreq policy
	121	* @policy: the policy to verify
	122	*
	123	* Validates a new CPUFreq policy. This function has to be called with
	124	* cpufreq_driver locked.
	125	*/
	126	static int longrun_verify_policy(struct cpufreq_policy *policy)
	127	{
	128	if (!policy)
	129	return -EINVAL;
	130
	131	policy->cpu = 0;
	132	cpufreq_verify_within_limits(policy,
	133	policy->cpuinfo.min_freq,
	134	policy->cpuinfo.max_freq);
	135
	136	if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) &&
	137	(policy->policy != CPUFREQ_POLICY_PERFORMANCE))
	138	return -EINVAL;
	139
	140	return 0;
	141	}
	142
	143	static unsigned int longrun_get(unsigned int cpu)
	144	{
145	u32 eax, ebx, ecx, edx;
146
147	if (cpu)
148	return 0;
149
150	cpuid(0x80860007, &eax, &ebx, &ecx, &edx);
2d06d8c4	151	pr_debug("cpuid eax is %u\n", eax);
1da177e4	152
48ee923a	153	return eax * 1000;
1da177e4 LT	154	}
	155
	156	/**
	157	* longrun_determine_freqs - determines the lowest and highest possible core frequency
	158	* @low_freq: an int to put the lowest frequency into
	159	* @high_freq: an int to put the highest frequency into
	160	*
	161	* Determines the lowest and highest possible core frequencies on this CPU.
	162	* This is necessary to calculate the performance percentage according to
	163	* TMTA rules:
	164	* performance_pctg = (target_freq - low_freq)/(high_freq - low_freq)
	165	*/
b2a33c17	166	static int __cpuinit longrun_determine_freqs(unsigned int *low_freq,
7e2d8112	167	unsigned int *high_freq)
1da177e4 LT	168	{
	169	u32 msr_lo, msr_hi;
	170	u32 save_lo, save_hi;
	171	u32 eax, ebx, ecx, edx;
	172	u32 try_hi;
92cb7612	173	struct cpuinfo_x86 *c = &cpu_data(0);
1da177e4 LT	174
	175	if (!low_freq \|\| !high_freq)
	176	return -EINVAL;
	177
	178	if (cpu_has(c, X86_FEATURE_LRTI)) {
	179	/* if the LongRun Table Interface is present, the
	180	* detection is a bit easier:
	181	* For minimum frequency, read out the maximum
	182	* level (msr_hi), write that into "currently
	183	* selected level", and read out the frequency.
	184	* For maximum frequency, read out level zero.
	185	*/
	186	/* minimum */
	187	rdmsr(MSR_TMTA_LRTI_READOUT, msr_lo, msr_hi);
	188	wrmsr(MSR_TMTA_LRTI_READOUT, msr_hi, msr_hi);
	189	rdmsr(MSR_TMTA_LRTI_VOLT_MHZ, msr_lo, msr_hi);
	190	low_freq = msr_lo 1000; /* to kHz */
	191
	192	/* maximum */
	193	wrmsr(MSR_TMTA_LRTI_READOUT, 0, msr_hi);
	194	rdmsr(MSR_TMTA_LRTI_VOLT_MHZ, msr_lo, msr_hi);
	195	high_freq = msr_lo 1000; /* to kHz */
	196
2d06d8c4	197	pr_debug("longrun table interface told %u - %u kHz\n",
48ee923a	198	low_freq, high_freq);
1da177e4 LT	199
	200	if (low_freq > high_freq)
	201	low_freq = high_freq;
	202	return 0;
	203	}
	204
	205	/* set the upper border to the value determined during TSC init */
	206	*high_freq = (cpu_khz / 1000);
	207	high_freq = high_freq * 1000;
2d06d8c4	208	pr_debug("high frequency is %u kHz\n", *high_freq);
1da177e4 LT	209
	210	/* get current borders */
	211	rdmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi);
	212	save_lo = msr_lo & 0x0000007F;
	213	save_hi = msr_hi & 0x0000007F;
	214
	215	/* if current perf_pctg is larger than 90%, we need to decrease the
	216	* upper limit to make the calculation more accurate.
	217	*/
	218	cpuid(0x80860007, &eax, &ebx, &ecx, &edx);
	219	/* try decreasing in 10% steps, some processors react only
	220	* on some barrier values */
48ee923a	221	for (try_hi = 80; try_hi > 0 && ecx > 90; try_hi -= 10) {
1da177e4 LT	222	/* set to 0 to try_hi perf_pctg */
	223	msr_lo &= 0xFFFFFF80;
	224	msr_hi &= 0xFFFFFF80;
1da177e4 LT	225	msr_hi \|= try_hi;
	226	wrmsr(MSR_TMTA_LONGRUN_CTRL, msr_lo, msr_hi);
	227
	228	/* read out current core MHz and current perf_pctg */
	229	cpuid(0x80860007, &eax, &ebx, &ecx, &edx);
	230
	231	/* restore values */
	232	wrmsr(MSR_TMTA_LONGRUN_CTRL, save_lo, save_hi);
	233	}
2d06d8c4	234	pr_debug("percentage is %u %%, freq is %u MHz\n", ecx, eax);
1da177e4 LT	235
	236	/* performance_pctg = (current_freq - low_freq)/(high_freq - low_freq)
	237	* eqals
48ee923a	238	* low_freq * (1 - perf_pctg) = (cur_freq - high_freq * perf_pctg)
1da177e4 LT	239	*
	240	* high_freq * perf_pctg is stored tempoarily into "ebx".
	241	*/
	242	ebx = (((cpu_khz / 1000) * ecx) / 100); /* to MHz */
	243
	244	if ((ecx > 95) \|\| (ecx == 0) \|\| (eax < ebx))
	245	return -EIO;
	246
667ad4f7	247	edx = ((eax - ebx) * 100) / (100 - ecx);
1da177e4 LT	248	low_freq = edx 1000; /* back to kHz */
1da177e4 LT	249
2d06d8c4	250	pr_debug("low frequency is %u kHz\n", *low_freq);
1da177e4 LT	251
	252	if (low_freq > high_freq)
	253	low_freq = high_freq;
	254
	255	return 0;
	256	}
	257
	258
7e2d8112	259	static int __cpuinit longrun_cpu_init(struct cpufreq_policy *policy)
1da177e4 LT	260	{
	261	int result = 0;
	262
	263	/* capability check */
	264	if (policy->cpu != 0)
	265	return -ENODEV;
	266
	267	/* detect low and high frequency */
	268	result = longrun_determine_freqs(&longrun_low_freq, &longrun_high_freq);
	269	if (result)
	270	return result;
	271
	272	/* cpuinfo and default policy values */
	273	policy->cpuinfo.min_freq = longrun_low_freq;
	274	policy->cpuinfo.max_freq = longrun_high_freq;
	275	policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
	276	longrun_get_policy(policy);
	277
	278	return 0;
	279	}
	280
	281
221dee28	282	static struct cpufreq_driver longrun_driver = {
1da177e4 LT	283	.flags = CPUFREQ_CONST_LOOPS,
	284	.verify = longrun_verify_policy,
	285	.setpolicy = longrun_set_policy,
	286	.get = longrun_get,
	287	.init = longrun_cpu_init,
	288	.name = "longrun",
	289	.owner = THIS_MODULE,
	290	};
	291
fa8031ae AK	292	static const struct x86_cpu_id longrun_ids[] = {
	293	{ X86_VENDOR_TRANSMETA, X86_FAMILY_ANY, X86_MODEL_ANY,
	294	X86_FEATURE_LONGRUN },
	295	{}
	296	};
	297	MODULE_DEVICE_TABLE(x86cpu, longrun_ids);
1da177e4 LT	298
	299	/**
	300	* longrun_init - initializes the Transmeta Crusoe LongRun CPUFreq driver
	301	*
	302	* Initializes the LongRun support.
	303	*/
	304	static int __init longrun_init(void)
	305	{
fa8031ae	306	if (!x86_match_cpu(longrun_ids))
1da177e4	307	return -ENODEV;
1da177e4 LT	308	return cpufreq_register_driver(&longrun_driver);
	309	}
	310
	311
	312	/**
	313	* longrun_exit - unregisters LongRun support
	314	*/
	315	static void __exit longrun_exit(void)
	316	{
	317	cpufreq_unregister_driver(&longrun_driver);
	318	}
	319
	320
48ee923a DJ	321	MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
	322	MODULE_DESCRIPTION("LongRun driver for Transmeta Crusoe and "
	323	"Efficeon processors.");
	324	MODULE_LICENSE("GPL");
1da177e4 LT	325
	326	module_init(longrun_init);
	327	module_exit(longrun_exit);