[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / platforms / cell / cbe_cpufreq.c

/*
 * cpufreq driver for the cell processor
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
 *
 * Author: Christian Krafft <krafft@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/cpufreq.h>
#include <linux/timer.h>

#include <asm/hw_irq.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/processor.h>
#include <asm/prom.h>
#include <asm/time.h>
#include <asm/pmi.h>
#include <asm/of_platform.h>

#include "cbe_regs.h"

static DEFINE_MUTEX(cbe_switch_mutex);


/* the CBE supports an 8 step frequency scaling */
static struct cpufreq_frequency_table cbe_freqs[] = {
	{1,	0},
	{2,	0},
	{3,	0},
	{4,	0},
	{5,	0},
	{6,	0},
	{8,	0},
	{10,	0},
	{0,	CPUFREQ_TABLE_END},
};

/* to write to MIC register */
static u64 MIC_Slow_Fast_Timer_table[] = {
	[0 ... 7] = 0x007fc00000000000ull,
};

/* more values for the MIC */
static u64 MIC_Slow_Next_Timer_table[] = {
	0x0000240000000000ull,
	0x0000268000000000ull,
	0x000029C000000000ull,
	0x00002D0000000000ull,
	0x0000300000000000ull,
	0x0000334000000000ull,
	0x000039C000000000ull,
	0x00003FC000000000ull,
};

static unsigned int pmi_frequency_limit = 0;

/*
 * hardware specific functions
 */

static bool cbe_cpufreq_has_pmi;

#ifdef CONFIG_PPC_PMI
static int set_pmode_pmi(int cpu, unsigned int pmode)
{
	int ret;
	pmi_message_t pmi_msg;
#ifdef DEBUG
	long time;
#endif

	pmi_msg.type = PMI_TYPE_FREQ_CHANGE;
	pmi_msg.data1 =	cbe_cpu_to_node(cpu);
	pmi_msg.data2 = pmode;

#ifdef DEBUG
	time = jiffies;
#endif

	pmi_send_message(pmi_msg);
	ret = pmi_msg.data2;

	pr_debug("PMI returned slow mode %d\n", ret);

#ifdef DEBUG
	time = jiffies - time; /* actual cycles (not cpu cycles!) */
	time = jiffies_to_msecs(time);
	pr_debug("had to wait %lu ms for a transition using PMI.\n", time);
#endif
	return ret;
}
#endif

static int get_pmode(int cpu)
{
	int ret;
	struct cbe_pmd_regs __iomem *pmd_regs;

	pmd_regs = cbe_get_cpu_pmd_regs(cpu);
	ret = in_be64(&pmd_regs->pmsr) & 0x07;

	return ret;
}

static int set_pmode_reg(int cpu, unsigned int pmode)
{
	struct cbe_pmd_regs __iomem *pmd_regs;
	struct cbe_mic_tm_regs __iomem *mic_tm_regs;
	u64 flags;
	u64 value;
#ifdef DEBUG
	long time;
#endif

	local_irq_save(flags);

	mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
	pmd_regs = cbe_get_cpu_pmd_regs(cpu);

#ifdef DEBUG
	time = jiffies;
#endif
	out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
	out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);

	out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
	out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);

	value = in_be64(&pmd_regs->pmcr);
	/* set bits to zero */
	value &= 0xFFFFFFFFFFFFFFF8ull;
	/* set bits to next pmode */
	value |= pmode;

	out_be64(&pmd_regs->pmcr, value);

#ifdef DEBUG
	/* wait until new pmode appears in status register */
	value = in_be64(&pmd_regs->pmsr) & 0x07;
	while(value != pmode) {
		cpu_relax();
		value = in_be64(&pmd_regs->pmsr) & 0x07;
	}

	time = jiffies - time;
	time = jiffies_to_msecs(time);
	pr_debug("had to wait %lu ms for a transition using " \
		 "the pervasive unit.\n", time);
#endif
	local_irq_restore(flags);

	return 0;
}

static int set_pmode(int cpu, unsigned int slow_mode)
{
#ifdef CONFIG_PPC_PMI
	if (cbe_cpufreq_has_pmi)
		return set_pmode_pmi(cpu, slow_mode);
#endif
	return set_pmode_reg(cpu, slow_mode);
}

static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
{
	u8 cpu;
	u8 cbe_pmode_new;

	BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);

	cpu = cbe_node_to_cpu(pmi_msg.data1);
	cbe_pmode_new = pmi_msg.data2;

	pmi_frequency_limit = cbe_freqs[cbe_pmode_new].frequency;

	pr_debug("cbe_handle_pmi: max freq=%d\n", pmi_frequency_limit);
}

static int pmi_notifier(struct notifier_block *nb,
				       unsigned long event, void *data)
{
	struct cpufreq_policy *policy = data;

	if (pmi_frequency_limit)
		cpufreq_verify_within_limits(policy, 0, pmi_frequency_limit);

	return 0;
}

static struct notifier_block pmi_notifier_block = {
	.notifier_call = pmi_notifier,
};

static struct pmi_handler cbe_pmi_handler = {
	.type			= PMI_TYPE_FREQ_CHANGE,
	.handle_pmi_message	= cbe_cpufreq_handle_pmi,
};


/*
 * cpufreq functions
 */

static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
	const u32 *max_freqp;
	u32 max_freq;
	int i, cur_pmode;
	struct device_node *cpu;

	cpu = of_get_cpu_node(policy->cpu, NULL);

	if (!cpu)
		return -ENODEV;

	pr_debug("init cpufreq on CPU %d\n", policy->cpu);

	max_freqp = of_get_property(cpu, "clock-frequency", NULL);

	if (!max_freqp)
		return -EINVAL;

	/* we need the freq in kHz */
	max_freq = *max_freqp / 1000;

	pr_debug("max clock-frequency is at %u kHz\n", max_freq);
	pr_debug("initializing frequency table\n");

	/* initialize frequency table */
	for (i=0; cbe_freqs[i].frequency!=CPUFREQ_TABLE_END; i++) {
		cbe_freqs[i].frequency = max_freq / cbe_freqs[i].index;
		pr_debug("%d: %d\n", i, cbe_freqs[i].frequency);
	}

	policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
	/* if DEBUG is enabled set_pmode() measures the correct latency of a transition */
	policy->cpuinfo.transition_latency = 25000;

	cur_pmode = get_pmode(policy->cpu);
	pr_debug("current pmode is at %d\n",cur_pmode);

	policy->cur = cbe_freqs[cur_pmode].frequency;

#ifdef CONFIG_SMP
	policy->cpus = cpu_sibling_map[policy->cpu];
#endif

	cpufreq_frequency_table_get_attr(cbe_freqs, policy->cpu);


	/* this ensures that policy->cpuinfo_min and policy->cpuinfo_max are set correctly */
	return cpufreq_frequency_table_cpuinfo(policy, cbe_freqs);
}

static int cbe_cpufreq_cpu_exit(struct cpufreq_policy *policy)
{
	cpufreq_frequency_table_put_attr(policy->cpu);
	return 0;
}

static int cbe_cpufreq_verify(struct cpufreq_policy *policy)
{
	return cpufreq_frequency_table_verify(policy, cbe_freqs);
}


static int cbe_cpufreq_target(struct cpufreq_policy *policy, unsigned int target_freq,
			    unsigned int relation)
{
	int rc;
	struct cpufreq_freqs freqs;
	int cbe_pmode_new;

	cpufreq_frequency_table_target(policy,
				       cbe_freqs,
				       target_freq,
				       relation,
				       &cbe_pmode_new);

	freqs.old = policy->cur;
	freqs.new = cbe_freqs[cbe_pmode_new].frequency;
	freqs.cpu = policy->cpu;

	mutex_lock(&cbe_switch_mutex);
	cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);

	pr_debug("setting frequency for cpu %d to %d kHz, 1/%d of max frequency\n",
		 policy->cpu,
		 cbe_freqs[cbe_pmode_new].frequency,
		 cbe_freqs[cbe_pmode_new].index);

	rc = set_pmode(policy->cpu, cbe_pmode_new);
	cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
	mutex_unlock(&cbe_switch_mutex);

	return rc;
}

static struct cpufreq_driver cbe_cpufreq_driver = {
	.verify		= cbe_cpufreq_verify,
	.target		= cbe_cpufreq_target,
	.init		= cbe_cpufreq_cpu_init,
	.exit		= cbe_cpufreq_cpu_exit,
	.name		= "cbe-cpufreq",
	.owner		= THIS_MODULE,
	.flags		= CPUFREQ_CONST_LOOPS,
};

/*
 * module init and destoy
 */

static int __init cbe_cpufreq_init(void)
{
	if (!machine_is(cell))
		return -ENODEV;

	cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;

	if (cbe_cpufreq_has_pmi)
		cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);

	return cpufreq_register_driver(&cbe_cpufreq_driver);
}

static void __exit cbe_cpufreq_exit(void)
{
	cpufreq_unregister_driver(&cbe_cpufreq_driver);

	if (cbe_cpufreq_has_pmi) {
		cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
		pmi_unregister_handler(&cbe_pmi_handler);
	}
}

module_init(cbe_cpufreq_init);
module_exit(cbe_cpufreq_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
Commit	Line	Data
36ca4ba4 CK	1	/*
	2	* cpufreq driver for the cell processor
	3	*
	4	* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
	5	*
	6	* Author: Christian Krafft <krafft@de.ibm.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2, or (at your option)
	11	* any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*/
	22
	23	#include <linux/cpufreq.h>
	24	#include <linux/timer.h>
	25
	26	#include <asm/hw_irq.h>
	27	#include <asm/io.h>
4bd4aa19	28	#include <asm/machdep.h>
36ca4ba4 CK	29	#include <asm/processor.h>
	30	#include <asm/prom.h>
	31	#include <asm/time.h>
5050063c CK	32	#include <asm/pmi.h>
5050063c CK	33	#include <asm/of_platform.h>
36ca4ba4 CK	34
	35	#include "cbe_regs.h"
	36
	37	static DEFINE_MUTEX(cbe_switch_mutex);
	38
	39
	40	/* the CBE supports an 8 step frequency scaling */
	41	static struct cpufreq_frequency_table cbe_freqs[] = {
	42	{1, 0},
	43	{2, 0},
	44	{3, 0},
	45	{4, 0},
	46	{5, 0},
	47	{6, 0},
	48	{8, 0},
	49	{10, 0},
	50	{0, CPUFREQ_TABLE_END},
	51	};
	52
	53	/* to write to MIC register */
	54	static u64 MIC_Slow_Fast_Timer_table[] = {
	55	[0 ... 7] = 0x007fc00000000000ull,
	56	};
	57
	58	/* more values for the MIC */
	59	static u64 MIC_Slow_Next_Timer_table[] = {
	60	0x0000240000000000ull,
	61	0x0000268000000000ull,
	62	0x000029C000000000ull,
	63	0x00002D0000000000ull,
	64	0x0000300000000000ull,
	65	0x0000334000000000ull,
	66	0x000039C000000000ull,
	67	0x00003FC000000000ull,
	68	};
	69
1552cb92	70	static unsigned int pmi_frequency_limit = 0;
813f9072	71
36ca4ba4 CK	72	/*
	73	* hardware specific functions
	74	*/
	75
813f9072	76	static bool cbe_cpufreq_has_pmi;
5050063c	77
ee5d1b7f	78	#ifdef CONFIG_PPC_PMI
5050063c CK	79	static int set_pmode_pmi(int cpu, unsigned int pmode)
	80	{
	81	int ret;
	82	pmi_message_t pmi_msg;
	83	#ifdef DEBUG
a964b9be	84	long time;
5050063c CK	85	#endif
	86
	87	pmi_msg.type = PMI_TYPE_FREQ_CHANGE;
	88	pmi_msg.data1 = cbe_cpu_to_node(cpu);
	89	pmi_msg.data2 = pmode;
	90
	91	#ifdef DEBUG
a964b9be	92	time = jiffies;
5050063c CK	93	#endif
5050063c CK	94
813f9072	95	pmi_send_message(pmi_msg);
5050063c CK	96	ret = pmi_msg.data2;
	97
	98	pr_debug("PMI returned slow mode %d\n", ret);
	99
	100	#ifdef DEBUG
a964b9be CK	101	time = jiffies - time; /* actual cycles (not cpu cycles!) */
	102	time = jiffies_to_msecs(time);
	103	pr_debug("had to wait %lu ms for a transition using PMI.\n", time);
5050063c CK	104	#endif
	105	return ret;
	106	}
ee5d1b7f	107	#endif
5050063c	108
36ca4ba4 CK	109	static int get_pmode(int cpu)
	110	{
	111	int ret;
	112	struct cbe_pmd_regs __iomem *pmd_regs;
	113
	114	pmd_regs = cbe_get_cpu_pmd_regs(cpu);
	115	ret = in_be64(&pmd_regs->pmsr) & 0x07;
	116
	117	return ret;
	118	}
	119
5050063c	120	static int set_pmode_reg(int cpu, unsigned int pmode)
36ca4ba4 CK	121	{
	122	struct cbe_pmd_regs __iomem *pmd_regs;
	123	struct cbe_mic_tm_regs __iomem *mic_tm_regs;
	124	u64 flags;
	125	u64 value;
a964b9be CK	126	#ifdef DEBUG
	127	long time;
	128	#endif
36ca4ba4 CK	129
	130	local_irq_save(flags);
	131
	132	mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
	133	pmd_regs = cbe_get_cpu_pmd_regs(cpu);
	134
a964b9be CK	135	#ifdef DEBUG
	136	time = jiffies;
	137	#endif
36ca4ba4 CK	138	out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
	139	out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);
	140
	141	out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
	142	out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);
	143
	144	value = in_be64(&pmd_regs->pmcr);
	145	/* set bits to zero */
	146	value &= 0xFFFFFFFFFFFFFFF8ull;
	147	/* set bits to next pmode */
	148	value \|= pmode;
	149
	150	out_be64(&pmd_regs->pmcr, value);
	151
a964b9be	152	#ifdef DEBUG
36ca4ba4 CK	153	/* wait until new pmode appears in status register */
	154	value = in_be64(&pmd_regs->pmsr) & 0x07;
	155	while(value != pmode) {
	156	cpu_relax();
	157	value = in_be64(&pmd_regs->pmsr) & 0x07;
	158	}
	159
a964b9be CK	160	time = jiffies - time;
	161	time = jiffies_to_msecs(time);
	162	pr_debug("had to wait %lu ms for a transition using " \
	163	"the pervasive unit.\n", time);
	164	#endif
36ca4ba4 CK	165	local_irq_restore(flags);
	166
	167	return 0;
	168	}
	169
813f9072 CK	170	static int set_pmode(int cpu, unsigned int slow_mode)
813f9072 CK	171	{
ee5d1b7f	172	#ifdef CONFIG_PPC_PMI
813f9072	173	if (cbe_cpufreq_has_pmi)
5050063c	174	return set_pmode_pmi(cpu, slow_mode);
ee5d1b7f	175	#endif
813f9072	176	return set_pmode_reg(cpu, slow_mode);
5050063c CK	177	}
5050063c CK	178
813f9072	179	static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
5050063c	180	{
5050063c CK	181	u8 cpu;
	182	u8 cbe_pmode_new;
	183
4bd4aa19	184	BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
5050063c CK	185
	186	cpu = cbe_node_to_cpu(pmi_msg.data1);
	187	cbe_pmode_new = pmi_msg.data2;
	188
1552cb92	189	pmi_frequency_limit = cbe_freqs[cbe_pmode_new].frequency;
5050063c	190
1552cb92 TR	191	pr_debug("cbe_handle_pmi: max freq=%d\n", pmi_frequency_limit);
	192	}
	193
	194	static int pmi_notifier(struct notifier_block *nb,
	195	unsigned long event, void *data)
	196	{
	197	struct cpufreq_policy *policy = data;
5050063c	198
e5ecc871 CK	199	if (pmi_frequency_limit)
e5ecc871 CK	200	cpufreq_verify_within_limits(policy, 0, pmi_frequency_limit);
1552cb92	201
1552cb92	202	return 0;
5050063c CK	203	}
5050063c CK	204
1552cb92 TR	205	static struct notifier_block pmi_notifier_block = {
	206	.notifier_call = pmi_notifier,
	207	};
	208
5050063c CK	209	static struct pmi_handler cbe_pmi_handler = {
	210	.type = PMI_TYPE_FREQ_CHANGE,
	211	.handle_pmi_message = cbe_cpufreq_handle_pmi,
	212	};
	213
	214
36ca4ba4 CK	215	/*
	216	* cpufreq functions
	217	*/
	218
4bd4aa19	219	static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
36ca4ba4	220	{
9c1a2bae SR	221	const u32 *max_freqp;
9c1a2bae SR	222	u32 max_freq;
36ca4ba4 CK	223	int i, cur_pmode;
	224	struct device_node *cpu;
	225
	226	cpu = of_get_cpu_node(policy->cpu, NULL);
	227
4bd4aa19	228	if (!cpu)
36ca4ba4 CK	229	return -ENODEV;
	230
	231	pr_debug("init cpufreq on CPU %d\n", policy->cpu);
	232
9c1a2bae	233	max_freqp = of_get_property(cpu, "clock-frequency", NULL);
36ca4ba4	234
9c1a2bae	235	if (!max_freqp)
36ca4ba4 CK	236	return -EINVAL;
36ca4ba4 CK	237
4bd4aa19	238	/* we need the freq in kHz */
9c1a2bae	239	max_freq = *max_freqp / 1000;
36ca4ba4	240
9c1a2bae	241	pr_debug("max clock-frequency is at %u kHz\n", max_freq);
36ca4ba4 CK	242	pr_debug("initializing frequency table\n");
36ca4ba4 CK	243
4bd4aa19	244	/* initialize frequency table */
36ca4ba4	245	for (i=0; cbe_freqs[i].frequency!=CPUFREQ_TABLE_END; i++) {
9c1a2bae	246	cbe_freqs[i].frequency = max_freq / cbe_freqs[i].index;
36ca4ba4 CK	247	pr_debug("%d: %d\n", i, cbe_freqs[i].frequency);
	248	}
	249
	250	policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
	251	/* if DEBUG is enabled set_pmode() measures the correct latency of a transition */
	252	policy->cpuinfo.transition_latency = 25000;
	253
	254	cur_pmode = get_pmode(policy->cpu);
	255	pr_debug("current pmode is at %d\n",cur_pmode);
	256
	257	policy->cur = cbe_freqs[cur_pmode].frequency;
	258
	259	#ifdef CONFIG_SMP
	260	policy->cpus = cpu_sibling_map[policy->cpu];
	261	#endif
	262
4bd4aa19	263	cpufreq_frequency_table_get_attr(cbe_freqs, policy->cpu);
36ca4ba4	264
1552cb92	265
36ca4ba4	266	/* this ensures that policy->cpuinfo_min and policy->cpuinfo_max are set correctly */
4bd4aa19	267	return cpufreq_frequency_table_cpuinfo(policy, cbe_freqs);
36ca4ba4 CK	268	}
	269
	270	static int cbe_cpufreq_cpu_exit(struct cpufreq_policy *policy)
	271	{
	272	cpufreq_frequency_table_put_attr(policy->cpu);
	273	return 0;
	274	}
	275
	276	static int cbe_cpufreq_verify(struct cpufreq_policy *policy)
	277	{
	278	return cpufreq_frequency_table_verify(policy, cbe_freqs);
	279	}
	280
	281
	282	static int cbe_cpufreq_target(struct cpufreq_policy *policy, unsigned int target_freq,
	283	unsigned int relation)
	284	{
	285	int rc;
	286	struct cpufreq_freqs freqs;
	287	int cbe_pmode_new;
	288
	289	cpufreq_frequency_table_target(policy,
	290	cbe_freqs,
	291	target_freq,
	292	relation,
	293	&cbe_pmode_new);
	294
	295	freqs.old = policy->cur;
	296	freqs.new = cbe_freqs[cbe_pmode_new].frequency;
	297	freqs.cpu = policy->cpu;
	298
4bd4aa19	299	mutex_lock(&cbe_switch_mutex);
36ca4ba4 CK	300	cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
	301
	302	pr_debug("setting frequency for cpu %d to %d kHz, 1/%d of max frequency\n",
	303	policy->cpu,
	304	cbe_freqs[cbe_pmode_new].frequency,
	305	cbe_freqs[cbe_pmode_new].index);
	306
	307	rc = set_pmode(policy->cpu, cbe_pmode_new);
	308	cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
	309	mutex_unlock(&cbe_switch_mutex);
	310
	311	return rc;
	312	}
	313
	314	static struct cpufreq_driver cbe_cpufreq_driver = {
	315	.verify = cbe_cpufreq_verify,
	316	.target = cbe_cpufreq_target,
	317	.init = cbe_cpufreq_cpu_init,
	318	.exit = cbe_cpufreq_cpu_exit,
	319	.name = "cbe-cpufreq",
	320	.owner = THIS_MODULE,
	321	.flags = CPUFREQ_CONST_LOOPS,
	322	};
	323
	324	/*
	325	* module init and destoy
	326	*/
	327
	328	static int __init cbe_cpufreq_init(void)
	329	{
4bd4aa19 OJ	330	if (!machine_is(cell))
4bd4aa19 OJ	331	return -ENODEV;
5050063c	332
813f9072	333	cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
5050063c	334
e5ecc871 CK	335	if (cbe_cpufreq_has_pmi)
	336	cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
	337
36ca4ba4 CK	338	return cpufreq_register_driver(&cbe_cpufreq_driver);
	339	}
	340
	341	static void __exit cbe_cpufreq_exit(void)
	342	{
	343	cpufreq_unregister_driver(&cbe_cpufreq_driver);
813f9072	344
e5ecc871 CK	345	if (cbe_cpufreq_has_pmi) {
e5ecc871 CK	346	cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
813f9072	347	pmi_unregister_handler(&cbe_pmi_handler);
e5ecc871	348	}
36ca4ba4 CK	349	}
	350
	351	module_init(cbe_cpufreq_init);
	352	module_exit(cbe_cpufreq_exit);
	353
	354	MODULE_LICENSE("GPL");
	355	MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");