[deliverable/linux.git] / drivers / cpufreq / omap-cpufreq.c

/*
 *  CPU frequency scaling for OMAP using OPP information
 *
 *  Copyright (C) 2005 Nokia Corporation
 *  Written by Tony Lindgren <tony@atomide.com>
 *
 *  Based on cpu-sa1110.c, Copyright (C) 2001 Russell King
 *
 * Copyright (C) 2007-2011 Texas Instruments, Inc.
 * - OMAP3/4 support by Rajendra Nayak, Santosh Shilimkar
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/opp.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>

#include <asm/smp_plat.h>
#include <asm/cpu.h>

#include <plat/clock.h>
#include <plat/omap-pm.h>
#include <plat/common.h>
#include <plat/omap_device.h>

#include <mach/hardware.h>

/* OPP tolerance in percentage */
#define	OPP_TOLERANCE	4

#ifdef CONFIG_SMP
struct lpj_info {
	unsigned long	ref;
	unsigned int	freq;
};

static DEFINE_PER_CPU(struct lpj_info, lpj_ref);
static struct lpj_info global_lpj_ref;
#endif

static struct cpufreq_frequency_table *freq_table;
static atomic_t freq_table_users = ATOMIC_INIT(0);
static struct clk *mpu_clk;
static char *mpu_clk_name;
static struct device *mpu_dev;
static struct regulator *mpu_reg;

static int omap_verify_speed(struct cpufreq_policy *policy)
{
	if (!freq_table)
		return -EINVAL;
	return cpufreq_frequency_table_verify(policy, freq_table);
}

static unsigned int omap_getspeed(unsigned int cpu)
{
	unsigned long rate;

	if (cpu >= NR_CPUS)
		return 0;

	rate = clk_get_rate(mpu_clk) / 1000;
	return rate;
}

static int omap_target(struct cpufreq_policy *policy,
		       unsigned int target_freq,
		       unsigned int relation)
{
	unsigned int i;
	int r, ret = 0;
	struct cpufreq_freqs freqs;
	struct opp *opp;
	unsigned long freq, volt = 0, volt_old = 0, tol = 0;

	if (!freq_table) {
		dev_err(mpu_dev, "%s: cpu%d: no freq table!\n", __func__,
				policy->cpu);
		return -EINVAL;
	}

	ret = cpufreq_frequency_table_target(policy, freq_table, target_freq,
			relation, &i);
	if (ret) {
		dev_dbg(mpu_dev, "%s: cpu%d: no freq match for %d(ret=%d)\n",
			__func__, policy->cpu, target_freq, ret);
		return ret;
	}
	freqs.new = freq_table[i].frequency;
	if (!freqs.new) {
		dev_err(mpu_dev, "%s: cpu%d: no match for freq %d\n", __func__,
			policy->cpu, target_freq);
		return -EINVAL;
	}

	freqs.old = omap_getspeed(policy->cpu);
	freqs.cpu = policy->cpu;

	if (freqs.old == freqs.new && policy->cur == freqs.new)
		return ret;

	/* notifiers */
	for_each_cpu(i, policy->cpus) {
		freqs.cpu = i;
		cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
	}

	freq = freqs.new * 1000;

	if (mpu_reg) {
		opp = opp_find_freq_ceil(mpu_dev, &freq);
		if (IS_ERR(opp)) {
			dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
				__func__, freqs.new);
			return -EINVAL;
		}
		volt = opp_get_voltage(opp);
		tol = volt * OPP_TOLERANCE / 100;
		volt_old = regulator_get_voltage(mpu_reg);
	}

	dev_dbg(mpu_dev, "cpufreq-omap: %u MHz, %ld mV --> %u MHz, %ld mV\n", 
		freqs.old / 1000, volt_old ? volt_old / 1000 : -1,
		freqs.new / 1000, volt ? volt / 1000 : -1);

	/* scaling up?  scale voltage before frequency */
	if (mpu_reg && (freqs.new > freqs.old)) {
		r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
		if (r < 0) {
			dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
				 __func__);
			freqs.new = freqs.old;
			goto done;
		}
	}

	ret = clk_set_rate(mpu_clk, freqs.new * 1000);

	/* scaling down?  scale voltage after frequency */
	if (mpu_reg && (freqs.new < freqs.old)) {
		r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
		if (r < 0) {
			dev_warn(mpu_dev, "%s: unable to scale voltage down.\n",
				 __func__);
			ret = clk_set_rate(mpu_clk, freqs.old * 1000);
			freqs.new = freqs.old;
			goto done;
		}
	}

	freqs.new = omap_getspeed(policy->cpu);
#ifdef CONFIG_SMP
	/*
	 * Note that loops_per_jiffy is not updated on SMP systems in
	 * cpufreq driver. So, update the per-CPU loops_per_jiffy value
	 * on frequency transition. We need to update all dependent CPUs.
	 */
	for_each_cpu(i, policy->cpus) {
		struct lpj_info *lpj = &per_cpu(lpj_ref, i);
		if (!lpj->freq) {
			lpj->ref = per_cpu(cpu_data, i).loops_per_jiffy;
			lpj->freq = freqs.old;
		}

		per_cpu(cpu_data, i).loops_per_jiffy =
			cpufreq_scale(lpj->ref, lpj->freq, freqs.new);
	}

	/* And don't forget to adjust the global one */
	if (!global_lpj_ref.freq) {
		global_lpj_ref.ref = loops_per_jiffy;
		global_lpj_ref.freq = freqs.old;
	}
	loops_per_jiffy = cpufreq_scale(global_lpj_ref.ref, global_lpj_ref.freq,
					freqs.new);
#endif

done:
	/* notifiers */
	for_each_cpu(i, policy->cpus) {
		freqs.cpu = i;
		cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
	}

	return ret;
}

static inline void freq_table_free(void)
{
	if (atomic_dec_and_test(&freq_table_users))
		opp_free_cpufreq_table(mpu_dev, &freq_table);
}

static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
{
	int result = 0;

	mpu_clk = clk_get(NULL, mpu_clk_name);
	if (IS_ERR(mpu_clk))
		return PTR_ERR(mpu_clk);

	if (policy->cpu >= NR_CPUS) {
		result = -EINVAL;
		goto fail_ck;
	}

	policy->cur = policy->min = policy->max = omap_getspeed(policy->cpu);

	if (!freq_table)
		result = opp_init_cpufreq_table(mpu_dev, &freq_table);

	if (result) {
		dev_err(mpu_dev, "%s: cpu%d: failed creating freq table[%d]\n",
				__func__, policy->cpu, result);
		goto fail_ck;
	}

	atomic_inc_return(&freq_table_users);

	result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
	if (result)
		goto fail_table;

	cpufreq_frequency_table_get_attr(freq_table, policy->cpu);

	policy->min = policy->cpuinfo.min_freq;
	policy->max = policy->cpuinfo.max_freq;
	policy->cur = omap_getspeed(policy->cpu);

	/*
	 * On OMAP SMP configuartion, both processors share the voltage
	 * and clock. So both CPUs needs to be scaled together and hence
	 * needs software co-ordination. Use cpufreq affected_cpus
	 * interface to handle this scenario. Additional is_smp() check
	 * is to keep SMP_ON_UP build working.
	 */
	if (is_smp()) {
		policy->shared_type = CPUFREQ_SHARED_TYPE_ANY;
		cpumask_setall(policy->cpus);
	}

	/* FIXME: what's the actual transition time? */
	policy->cpuinfo.transition_latency = 300 * 1000;

	return 0;

fail_table:
	freq_table_free();
fail_ck:
	clk_put(mpu_clk);
	return result;
}

static int omap_cpu_exit(struct cpufreq_policy *policy)
{
	freq_table_free();
	clk_put(mpu_clk);
	return 0;
}

static struct freq_attr *omap_cpufreq_attr[] = {
	&cpufreq_freq_attr_scaling_available_freqs,
	NULL,
};

static struct cpufreq_driver omap_driver = {
	.flags		= CPUFREQ_STICKY,
	.verify		= omap_verify_speed,
	.target		= omap_target,
	.get		= omap_getspeed,
	.init		= omap_cpu_init,
	.exit		= omap_cpu_exit,
	.name		= "omap",
	.attr		= omap_cpufreq_attr,
};

static int __init omap_cpufreq_init(void)
{
	if (cpu_is_omap24xx())
		mpu_clk_name = "virt_prcm_set";
	else if (cpu_is_omap34xx())
		mpu_clk_name = "dpll1_ck";
	else if (cpu_is_omap44xx())
		mpu_clk_name = "dpll_mpu_ck";

	if (!mpu_clk_name) {
		pr_err("%s: unsupported Silicon?\n", __func__);
		return -EINVAL;
	}

	mpu_dev = omap_device_get_by_hwmod_name("mpu");
	if (!mpu_dev) {
		pr_warning("%s: unable to get the mpu device\n", __func__);
		return -EINVAL;
	}

	mpu_reg = regulator_get(mpu_dev, "vcc");
	if (IS_ERR(mpu_reg)) {
		pr_warning("%s: unable to get MPU regulator\n", __func__);
		mpu_reg = NULL;
	} else {
		/* 
		 * Ensure physical regulator is present.
		 * (e.g. could be dummy regulator.)
		 */
		if (regulator_get_voltage(mpu_reg) < 0) {
			pr_warn("%s: physical regulator not present for MPU\n",
				__func__);
			regulator_put(mpu_reg);
			mpu_reg = NULL;
		}
	}

	return cpufreq_register_driver(&omap_driver);
}

static void __exit omap_cpufreq_exit(void)
{
	cpufreq_unregister_driver(&omap_driver);
}

MODULE_DESCRIPTION("cpufreq driver for OMAP SoCs");
MODULE_LICENSE("GPL");
module_init(omap_cpufreq_init);
module_exit(omap_cpufreq_exit);
Commit	Line	Data
ec6bced6	1	/*
ffe4f0f1	2	* CPU frequency scaling for OMAP using OPP information
ec6bced6 TL	3	*
	4	* Copyright (C) 2005 Nokia Corporation
	5	* Written by Tony Lindgren <tony@atomide.com>
	6	*
	7	* Based on cpu-sa1110.c, Copyright (C) 2001 Russell King
	8	*
731e0cc6 SS	9	* Copyright (C) 2007-2011 Texas Instruments, Inc.
	10	* - OMAP3/4 support by Rajendra Nayak, Santosh Shilimkar
	11	*
ec6bced6 TL	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*/
	16	#include <linux/types.h>
	17	#include <linux/kernel.h>
	18	#include <linux/sched.h>
	19	#include <linux/cpufreq.h>
	20	#include <linux/delay.h>
	21	#include <linux/init.h>
	22	#include <linux/err.h>
f8ce2547	23	#include <linux/clk.h>
fced80c7	24	#include <linux/io.h>
731e0cc6	25	#include <linux/opp.h>
46c12216	26	#include <linux/cpu.h>
c1b547bc	27	#include <linux/module.h>
53dfe8a8	28	#include <linux/regulator/consumer.h>
ec6bced6	29
731e0cc6	30	#include <asm/smp_plat.h>
46c12216	31	#include <asm/cpu.h>
ec6bced6	32
731e0cc6 SS	33	#include <plat/clock.h>
	34	#include <plat/omap-pm.h>
	35	#include <plat/common.h>
c1b547bc	36	#include <plat/omap_device.h>
a7ca9d2b	37
731e0cc6	38	#include <mach/hardware.h>
aeec2990	39
42daffd2 AM	40	/* OPP tolerance in percentage */
	41	#define OPP_TOLERANCE 4
	42
46c12216 RK	43	#ifdef CONFIG_SMP
	44	struct lpj_info {
	45	unsigned long ref;
	46	unsigned int freq;
	47	};
	48
	49	static DEFINE_PER_CPU(struct lpj_info, lpj_ref);
	50	static struct lpj_info global_lpj_ref;
	51	#endif
	52
731e0cc6	53	static struct cpufreq_frequency_table *freq_table;
1c78217f	54	static atomic_t freq_table_users = ATOMIC_INIT(0);
b8488fbe	55	static struct clk *mpu_clk;
08ca3e3b	56	static char *mpu_clk_name;
a820ffa8	57	static struct device *mpu_dev;
53dfe8a8	58	static struct regulator *mpu_reg;
b8488fbe	59
b0a330dc	60	static int omap_verify_speed(struct cpufreq_policy *policy)
ec6bced6	61	{
bf2a359d	62	if (!freq_table)
ec6bced6	63	return -EINVAL;
bf2a359d	64	return cpufreq_frequency_table_verify(policy, freq_table);
ec6bced6 TL	65	}
ec6bced6 TL	66
b0a330dc	67	static unsigned int omap_getspeed(unsigned int cpu)
ec6bced6	68	{
ec6bced6 TL	69	unsigned long rate;
ec6bced6 TL	70
46c12216	71	if (cpu >= NR_CPUS)
ec6bced6 TL	72	return 0;
ec6bced6 TL	73
ec6bced6	74	rate = clk_get_rate(mpu_clk) / 1000;
ec6bced6 TL	75	return rate;
	76	}
	77
	78	static int omap_target(struct cpufreq_policy *policy,
	79	unsigned int target_freq,
	80	unsigned int relation)
	81	{
bf2a359d	82	unsigned int i;
53dfe8a8	83	int r, ret = 0;
731e0cc6	84	struct cpufreq_freqs freqs;
53dfe8a8	85	struct opp *opp;
42daffd2	86	unsigned long freq, volt = 0, volt_old = 0, tol = 0;
ec6bced6	87
bf2a359d NM	88	if (!freq_table) {
	89	dev_err(mpu_dev, "%s: cpu%d: no freq table!\n", __func__,
	90	policy->cpu);
	91	return -EINVAL;
	92	}
	93
	94	ret = cpufreq_frequency_table_target(policy, freq_table, target_freq,
	95	relation, &i);
	96	if (ret) {
	97	dev_dbg(mpu_dev, "%s: cpu%d: no freq match for %d(ret=%d)\n",
	98	__func__, policy->cpu, target_freq, ret);
	99	return ret;
	100	}
	101	freqs.new = freq_table[i].frequency;
	102	if (!freqs.new) {
	103	dev_err(mpu_dev, "%s: cpu%d: no match for freq %d\n", __func__,
	104	policy->cpu, target_freq);
	105	return -EINVAL;
	106	}
aeec2990	107
46c12216	108	freqs.old = omap_getspeed(policy->cpu);
46c12216	109	freqs.cpu = policy->cpu;
ec6bced6	110
022ac03b	111	if (freqs.old == freqs.new && policy->cur == freqs.new)
aeec2990 KH	112	return ret;
aeec2990 KH	113
46c12216 RK	114	/* notifiers */
	115	for_each_cpu(i, policy->cpus) {
	116	freqs.cpu = i;
	117	cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
	118	}
731e0cc6	119
53dfe8a8 KH	120	freq = freqs.new * 1000;
	121
	122	if (mpu_reg) {
	123	opp = opp_find_freq_ceil(mpu_dev, &freq);
	124	if (IS_ERR(opp)) {
	125	dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
	126	__func__, freqs.new);
	127	return -EINVAL;
	128	}
	129	volt = opp_get_voltage(opp);
42daffd2	130	tol = volt * OPP_TOLERANCE / 100;
53dfe8a8 KH	131	volt_old = regulator_get_voltage(mpu_reg);
	132	}
	133
	134	dev_dbg(mpu_dev, "cpufreq-omap: %u MHz, %ld mV --> %u MHz, %ld mV\n",
	135	freqs.old / 1000, volt_old ? volt_old / 1000 : -1,
	136	freqs.new / 1000, volt ? volt / 1000 : -1);
	137
	138	/* scaling up? scale voltage before frequency */
	139	if (mpu_reg && (freqs.new > freqs.old)) {
42daffd2	140	r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
53dfe8a8 KH	141	if (r < 0) {
	142	dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
	143	__func__);
	144	freqs.new = freqs.old;
	145	goto done;
	146	}
	147	}
731e0cc6	148
aeec2990	149	ret = clk_set_rate(mpu_clk, freqs.new * 1000);
46c12216	150
53dfe8a8 KH	151	/* scaling down? scale voltage after frequency */
53dfe8a8 KH	152	if (mpu_reg && (freqs.new < freqs.old)) {
42daffd2	153	r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
53dfe8a8 KH	154	if (r < 0) {
	155	dev_warn(mpu_dev, "%s: unable to scale voltage down.\n",
	156	__func__);
	157	ret = clk_set_rate(mpu_clk, freqs.old * 1000);
	158	freqs.new = freqs.old;
	159	goto done;
	160	}
	161	}
	162
	163	freqs.new = omap_getspeed(policy->cpu);
46c12216 RK	164	#ifdef CONFIG_SMP
	165	/*
	166	* Note that loops_per_jiffy is not updated on SMP systems in
	167	* cpufreq driver. So, update the per-CPU loops_per_jiffy value
	168	* on frequency transition. We need to update all dependent CPUs.
	169	*/
	170	for_each_cpu(i, policy->cpus) {
	171	struct lpj_info *lpj = &per_cpu(lpj_ref, i);
	172	if (!lpj->freq) {
	173	lpj->ref = per_cpu(cpu_data, i).loops_per_jiffy;
	174	lpj->freq = freqs.old;
	175	}
	176
	177	per_cpu(cpu_data, i).loops_per_jiffy =
	178	cpufreq_scale(lpj->ref, lpj->freq, freqs.new);
	179	}
731e0cc6	180
46c12216 RK	181	/* And don't forget to adjust the global one */
	182	if (!global_lpj_ref.freq) {
	183	global_lpj_ref.ref = loops_per_jiffy;
	184	global_lpj_ref.freq = freqs.old;
	185	}
	186	loops_per_jiffy = cpufreq_scale(global_lpj_ref.ref, global_lpj_ref.freq,
	187	freqs.new);
	188	#endif
	189
53dfe8a8	190	done:
46c12216 RK	191	/* notifiers */
	192	for_each_cpu(i, policy->cpus) {
	193	freqs.cpu = i;
	194	cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
	195	}
ec6bced6 TL	196
	197	return ret;
	198	}
	199
1c78217f NM	200	static inline void freq_table_free(void)
	201	{
	202	if (atomic_dec_and_test(&freq_table_users))
	203	opp_free_cpufreq_table(mpu_dev, &freq_table);
	204	}
	205
790ab7e9	206	static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
ec6bced6	207	{
aeec2990	208	int result = 0;
731e0cc6	209
08ca3e3b	210	mpu_clk = clk_get(NULL, mpu_clk_name);
ec6bced6 TL	211	if (IS_ERR(mpu_clk))
	212	return PTR_ERR(mpu_clk);
	213
11e04fdd NM	214	if (policy->cpu >= NR_CPUS) {
	215	result = -EINVAL;
	216	goto fail_ck;
	217	}
aeec2990	218
46c12216	219	policy->cur = policy->min = policy->max = omap_getspeed(policy->cpu);
1c78217f	220
1b865214	221	if (!freq_table)
1c78217f	222	result = opp_init_cpufreq_table(mpu_dev, &freq_table);
bf2a359d NM	223
	224	if (result) {
	225	dev_err(mpu_dev, "%s: cpu%d: failed creating freq table[%d]\n",
	226	__func__, policy->cpu, result);
11e04fdd	227	goto fail_ck;
aeec2990 KH	228	}
aeec2990 KH	229
1b865214 RN	230	atomic_inc_return(&freq_table_users);
1b865214 RN	231
bf2a359d	232	result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
1c78217f NM	233	if (result)
	234	goto fail_table;
	235
	236	cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
bf2a359d	237
731e0cc6 SS	238	policy->min = policy->cpuinfo.min_freq;
731e0cc6 SS	239	policy->max = policy->cpuinfo.max_freq;
46c12216 RK	240	policy->cur = omap_getspeed(policy->cpu);
	241
	242	/*
	243	* On OMAP SMP configuartion, both processors share the voltage
	244	* and clock. So both CPUs needs to be scaled together and hence
	245	* needs software co-ordination. Use cpufreq affected_cpus
	246	* interface to handle this scenario. Additional is_smp() check
	247	* is to keep SMP_ON_UP build working.
	248	*/
	249	if (is_smp()) {
	250	policy->shared_type = CPUFREQ_SHARED_TYPE_ANY;
ed8ce00c	251	cpumask_setall(policy->cpus);
46c12216	252	}
731e0cc6	253
aeec2990	254	/* FIXME: what's the actual transition time? */
b029839c	255	policy->cpuinfo.transition_latency = 300 * 1000;
ec6bced6 TL	256
ec6bced6 TL	257	return 0;
11e04fdd	258
1c78217f NM	259	fail_table:
1c78217f NM	260	freq_table_free();
11e04fdd NM	261	fail_ck:
	262	clk_put(mpu_clk);
	263	return result;
ec6bced6 TL	264	}
ec6bced6 TL	265
b8488fbe HD	266	static int omap_cpu_exit(struct cpufreq_policy *policy)
b8488fbe HD	267	{
1c78217f	268	freq_table_free();
b8488fbe HD	269	clk_put(mpu_clk);
	270	return 0;
	271	}
	272
aeec2990 KH	273	static struct freq_attr *omap_cpufreq_attr[] = {
	274	&cpufreq_freq_attr_scaling_available_freqs,
	275	NULL,
	276	};
	277
ec6bced6 TL	278	static struct cpufreq_driver omap_driver = {
	279	.flags = CPUFREQ_STICKY,
	280	.verify = omap_verify_speed,
	281	.target = omap_target,
	282	.get = omap_getspeed,
	283	.init = omap_cpu_init,
b8488fbe	284	.exit = omap_cpu_exit,
ec6bced6	285	.name = "omap",
aeec2990	286	.attr = omap_cpufreq_attr,
ec6bced6 TL	287	};
	288
	289	static int __init omap_cpufreq_init(void)
	290	{
08ca3e3b NM	291	if (cpu_is_omap24xx())
	292	mpu_clk_name = "virt_prcm_set";
	293	else if (cpu_is_omap34xx())
	294	mpu_clk_name = "dpll1_ck";
	295	else if (cpu_is_omap44xx())
	296	mpu_clk_name = "dpll_mpu_ck";
	297
	298	if (!mpu_clk_name) {
	299	pr_err("%s: unsupported Silicon?\n", __func__);
	300	return -EINVAL;
	301	}
a820ffa8	302
c1b547bc	303	mpu_dev = omap_device_get_by_hwmod_name("mpu");
a820ffa8 NM	304	if (!mpu_dev) {
	305	pr_warning("%s: unable to get the mpu device\n", __func__);
	306	return -EINVAL;
	307	}
	308
53dfe8a8 KH	309	mpu_reg = regulator_get(mpu_dev, "vcc");
	310	if (IS_ERR(mpu_reg)) {
	311	pr_warning("%s: unable to get MPU regulator\n", __func__);
	312	mpu_reg = NULL;
	313	} else {
	314	/*
	315	* Ensure physical regulator is present.
	316	* (e.g. could be dummy regulator.)
	317	*/
	318	if (regulator_get_voltage(mpu_reg) < 0) {
	319	pr_warn("%s: physical regulator not present for MPU\n",
	320	__func__);
	321	regulator_put(mpu_reg);
	322	mpu_reg = NULL;
	323	}
	324	}
	325
ec6bced6 TL	326	return cpufreq_register_driver(&omap_driver);
	327	}
	328
731e0cc6 SS	329	static void __exit omap_cpufreq_exit(void)
	330	{
	331	cpufreq_unregister_driver(&omap_driver);
	332	}
aeec2990	333
731e0cc6 SS	334	MODULE_DESCRIPTION("cpufreq driver for OMAP SoCs");
	335	MODULE_LICENSE("GPL");
	336	module_init(omap_cpufreq_init);
	337	module_exit(omap_cpufreq_exit);