[linux-2.6-block.git] / drivers / cpufreq / ia64-acpi-cpufreq.c

/*
 * This file provides the ACPI based P-state support. This
 * module works with generic cpufreq infrastructure. Most of
 * the code is based on i386 version
 * (arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c)
 *
 * Copyright (C) 2005 Intel Corp
 *      Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/pal.h>

#include <linux/acpi.h>
#include <acpi/processor.h>

MODULE_AUTHOR("Venkatesh Pallipadi");
MODULE_DESCRIPTION("ACPI Processor P-States Driver");
MODULE_LICENSE("GPL");


struct cpufreq_acpi_io {
	struct acpi_processor_performance	acpi_data;
	struct cpufreq_frequency_table		*freq_table;
	unsigned int				resume;
};

static struct cpufreq_acpi_io	*acpi_io_data[NR_CPUS];

static struct cpufreq_driver acpi_cpufreq_driver;


static int
processor_set_pstate (
	u32	value)
{
	s64 retval;

	pr_debug("processor_set_pstate\n");

	retval = ia64_pal_set_pstate((u64)value);

	if (retval) {
		pr_debug("Failed to set freq to 0x%x, with error 0x%lx\n",
		        value, retval);
		return -ENODEV;
	}
	return (int)retval;
}


static int
processor_get_pstate (
	u32	*value)
{
	u64	pstate_index = 0;
	s64 	retval;

	pr_debug("processor_get_pstate\n");

	retval = ia64_pal_get_pstate(&pstate_index,
	                             PAL_GET_PSTATE_TYPE_INSTANT);
	*value = (u32) pstate_index;

	if (retval)
		pr_debug("Failed to get current freq with "
			"error 0x%lx, idx 0x%x\n", retval, *value);

	return (int)retval;
}


/* To be used only after data->acpi_data is initialized */
static unsigned
extract_clock (
	struct cpufreq_acpi_io *data,
	unsigned value,
	unsigned int cpu)
{
	unsigned long i;

	pr_debug("extract_clock\n");

	for (i = 0; i < data->acpi_data.state_count; i++) {
		if (value == data->acpi_data.states[i].status)
			return data->acpi_data.states[i].core_frequency;
	}
	return data->acpi_data.states[i-1].core_frequency;
}


static unsigned int
processor_get_freq (
	struct cpufreq_acpi_io	*data,
	unsigned int		cpu)
{
	int			ret = 0;
	u32			value = 0;
	cpumask_t		saved_mask;
	unsigned long 		clock_freq;

	pr_debug("processor_get_freq\n");

	saved_mask = current->cpus_allowed;
	set_cpus_allowed_ptr(current, cpumask_of(cpu));
	if (smp_processor_id() != cpu)
		goto migrate_end;

	/* processor_get_pstate gets the instantaneous frequency */
	ret = processor_get_pstate(&value);

	if (ret) {
		set_cpus_allowed_ptr(current, &saved_mask);
		printk(KERN_WARNING "get performance failed with error %d\n",
		       ret);
		ret = 0;
		goto migrate_end;
	}
	clock_freq = extract_clock(data, value, cpu);
	ret = (clock_freq*1000);

migrate_end:
	set_cpus_allowed_ptr(current, &saved_mask);
	return ret;
}


static int
processor_set_freq (
	struct cpufreq_acpi_io	*data,
	struct cpufreq_policy   *policy,
	int			state)
{
	int			ret = 0;
	u32			value = 0;
	struct cpufreq_freqs    cpufreq_freqs;
	cpumask_t		saved_mask;
	int			retval;

	pr_debug("processor_set_freq\n");

	saved_mask = current->cpus_allowed;
	set_cpus_allowed_ptr(current, cpumask_of(policy->cpu));
	if (smp_processor_id() != policy->cpu) {
		retval = -EAGAIN;
		goto migrate_end;
	}

	if (state == data->acpi_data.state) {
		if (unlikely(data->resume)) {
			pr_debug("Called after resume, resetting to P%d\n", state);
			data->resume = 0;
		} else {
			pr_debug("Already at target state (P%d)\n", state);
			retval = 0;
			goto migrate_end;
		}
	}

	pr_debug("Transitioning from P%d to P%d\n",
		data->acpi_data.state, state);

	/* cpufreq frequency struct */
	cpufreq_freqs.old = data->freq_table[data->acpi_data.state].frequency;
	cpufreq_freqs.new = data->freq_table[state].frequency;

	/* notify cpufreq */
	cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_PRECHANGE);

	/*
	 * First we write the target state's 'control' value to the
	 * control_register.
	 */

	value = (u32) data->acpi_data.states[state].control;

	pr_debug("Transitioning to state: 0x%08x\n", value);

	ret = processor_set_pstate(value);
	if (ret) {
		unsigned int tmp = cpufreq_freqs.new;
		cpufreq_notify_transition(policy, &cpufreq_freqs,
				CPUFREQ_POSTCHANGE);
		cpufreq_freqs.new = cpufreq_freqs.old;
		cpufreq_freqs.old = tmp;
		cpufreq_notify_transition(policy, &cpufreq_freqs,
				CPUFREQ_PRECHANGE);
		cpufreq_notify_transition(policy, &cpufreq_freqs,
				CPUFREQ_POSTCHANGE);
		printk(KERN_WARNING "Transition failed with error %d\n", ret);
		retval = -ENODEV;
		goto migrate_end;
	}

	cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_POSTCHANGE);

	data->acpi_data.state = state;

	retval = 0;

migrate_end:
	set_cpus_allowed_ptr(current, &saved_mask);
	return (retval);
}


static unsigned int
acpi_cpufreq_get (
	unsigned int		cpu)
{
	struct cpufreq_acpi_io *data = acpi_io_data[cpu];

	pr_debug("acpi_cpufreq_get\n");

	return processor_get_freq(data, cpu);
}


static int
acpi_cpufreq_target (
	struct cpufreq_policy   *policy,
	unsigned int target_freq,
	unsigned int relation)
{
	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
	unsigned int next_state = 0;
	unsigned int result = 0;

	pr_debug("acpi_cpufreq_setpolicy\n");

	result = cpufreq_frequency_table_target(policy,
			data->freq_table, target_freq, relation, &next_state);
	if (result)
		return (result);

	result = processor_set_freq(data, policy, next_state);

	return (result);
}


static int
acpi_cpufreq_verify (
	struct cpufreq_policy   *policy)
{
	unsigned int result = 0;
	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];

	pr_debug("acpi_cpufreq_verify\n");

	result = cpufreq_frequency_table_verify(policy,
			data->freq_table);

	return (result);
}


static int
acpi_cpufreq_cpu_init (
	struct cpufreq_policy   *policy)
{
	unsigned int		i;
	unsigned int		cpu = policy->cpu;
	struct cpufreq_acpi_io	*data;
	unsigned int		result = 0;

	pr_debug("acpi_cpufreq_cpu_init\n");

	data = kzalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
	if (!data)
		return (-ENOMEM);

	acpi_io_data[cpu] = data;

	result = acpi_processor_register_performance(&data->acpi_data, cpu);

	if (result)
		goto err_free;

	/* capability check */
	if (data->acpi_data.state_count <= 1) {
		pr_debug("No P-States\n");
		result = -ENODEV;
		goto err_unreg;
	}

	if ((data->acpi_data.control_register.space_id !=
					ACPI_ADR_SPACE_FIXED_HARDWARE) ||
	    (data->acpi_data.status_register.space_id !=
					ACPI_ADR_SPACE_FIXED_HARDWARE)) {
		pr_debug("Unsupported address space [%d, %d]\n",
			(u32) (data->acpi_data.control_register.space_id),
			(u32) (data->acpi_data.status_register.space_id));
		result = -ENODEV;
		goto err_unreg;
	}

	/* alloc freq_table */
	data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
	                           (data->acpi_data.state_count + 1),
	                           GFP_KERNEL);
	if (!data->freq_table) {
		result = -ENOMEM;
		goto err_unreg;
	}

	/* detect transition latency */
	policy->cpuinfo.transition_latency = 0;
	for (i=0; i<data->acpi_data.state_count; i++) {
		if ((data->acpi_data.states[i].transition_latency * 1000) >
		    policy->cpuinfo.transition_latency) {
			policy->cpuinfo.transition_latency =
			    data->acpi_data.states[i].transition_latency * 1000;
		}
	}
	policy->cur = processor_get_freq(data, policy->cpu);

	/* table init */
	for (i = 0; i <= data->acpi_data.state_count; i++)
	{
		data->freq_table[i].index = i;
		if (i < data->acpi_data.state_count) {
			data->freq_table[i].frequency =
			      data->acpi_data.states[i].core_frequency * 1000;
		} else {
			data->freq_table[i].frequency = CPUFREQ_TABLE_END;
		}
	}

	result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
	if (result) {
		goto err_freqfree;
	}

	/* notify BIOS that we exist */
	acpi_processor_notify_smm(THIS_MODULE);

	printk(KERN_INFO "acpi-cpufreq: CPU%u - ACPI performance management "
	       "activated.\n", cpu);

	for (i = 0; i < data->acpi_data.state_count; i++)
		pr_debug("     %cP%d: %d MHz, %d mW, %d uS, %d uS, 0x%x 0x%x\n",
			(i == data->acpi_data.state?'*':' '), i,
			(u32) data->acpi_data.states[i].core_frequency,
			(u32) data->acpi_data.states[i].power,
			(u32) data->acpi_data.states[i].transition_latency,
			(u32) data->acpi_data.states[i].bus_master_latency,
			(u32) data->acpi_data.states[i].status,
			(u32) data->acpi_data.states[i].control);

	cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);

	/* the first call to ->target() should result in us actually
	 * writing something to the appropriate registers. */
	data->resume = 1;

	return (result);

 err_freqfree:
	kfree(data->freq_table);
 err_unreg:
	acpi_processor_unregister_performance(&data->acpi_data, cpu);
 err_free:
	kfree(data);
	acpi_io_data[cpu] = NULL;

	return (result);
}


static int
acpi_cpufreq_cpu_exit (
	struct cpufreq_policy   *policy)
{
	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];

	pr_debug("acpi_cpufreq_cpu_exit\n");

	if (data) {
		cpufreq_frequency_table_put_attr(policy->cpu);
		acpi_io_data[policy->cpu] = NULL;
		acpi_processor_unregister_performance(&data->acpi_data,
		                                      policy->cpu);
		kfree(data);
	}

	return (0);
}


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


static struct cpufreq_driver acpi_cpufreq_driver = {
	.verify 	= acpi_cpufreq_verify,
	.target 	= acpi_cpufreq_target,
	.get 		= acpi_cpufreq_get,
	.init		= acpi_cpufreq_cpu_init,
	.exit		= acpi_cpufreq_cpu_exit,
	.name		= "acpi-cpufreq",
	.owner		= THIS_MODULE,
	.attr           = acpi_cpufreq_attr,
};


static int __init
acpi_cpufreq_init (void)
{
	pr_debug("acpi_cpufreq_init\n");

 	return cpufreq_register_driver(&acpi_cpufreq_driver);
}


static void __exit
acpi_cpufreq_exit (void)
{
	pr_debug("acpi_cpufreq_exit\n");

	cpufreq_unregister_driver(&acpi_cpufreq_driver);
	return;
}


late_initcall(acpi_cpufreq_init);
module_exit(acpi_cpufreq_exit);
Commit	Line	Data
4db8699b	1	/*
4db8699b VP	2	* This file provides the ACPI based P-state support. This
	3	* module works with generic cpufreq infrastructure. Most of
	4	* the code is based on i386 version
	5	* (arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c)
	6	*
	7	* Copyright (C) 2005 Intel Corp
	8	* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
	9	*/
	10
4db8699b	11	#include <linux/kernel.h>
5a0e3ad6	12	#include <linux/slab.h>
4db8699b VP	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/cpufreq.h>
	16	#include <linux/proc_fs.h>
	17	#include <linux/seq_file.h>
	18	#include <asm/io.h>
	19	#include <asm/uaccess.h>
	20	#include <asm/pal.h>
	21
	22	#include <linux/acpi.h>
	23	#include <acpi/processor.h>
	24
4db8699b VP	25	MODULE_AUTHOR("Venkatesh Pallipadi");
	26	MODULE_DESCRIPTION("ACPI Processor P-States Driver");
	27	MODULE_LICENSE("GPL");
	28
	29
	30	struct cpufreq_acpi_io {
	31	struct acpi_processor_performance acpi_data;
	32	struct cpufreq_frequency_table *freq_table;
	33	unsigned int resume;
	34	};
	35
	36	static struct cpufreq_acpi_io *acpi_io_data[NR_CPUS];
	37
	38	static struct cpufreq_driver acpi_cpufreq_driver;
	39
	40
	41	static int
	42	processor_set_pstate (
	43	u32 value)
	44	{
	45	s64 retval;
	46
2d06d8c4	47	pr_debug("processor_set_pstate\n");
4db8699b VP	48
	49	retval = ia64_pal_set_pstate((u64)value);
	50
	51	if (retval) {
2d06d8c4	52	pr_debug("Failed to set freq to 0x%x, with error 0x%lx\n",
4db8699b VP	53	value, retval);
	54	return -ENODEV;
	55	}
	56	return (int)retval;
	57	}
	58
	59
	60	static int
	61	processor_get_pstate (
	62	u32 *value)
	63	{
	64	u64 pstate_index = 0;
	65	s64 retval;
	66
2d06d8c4	67	pr_debug("processor_get_pstate\n");
4db8699b	68
17e77b1c VP	69	retval = ia64_pal_get_pstate(&pstate_index,
17e77b1c VP	70	PAL_GET_PSTATE_TYPE_INSTANT);
4db8699b VP	71	*value = (u32) pstate_index;
	72
	73	if (retval)
2d06d8c4	74	pr_debug("Failed to get current freq with "
60192db8	75	"error 0x%lx, idx 0x%x\n", retval, *value);
4db8699b VP	76
	77	return (int)retval;
	78	}
	79
	80
	81	/* To be used only after data->acpi_data is initialized */
	82	static unsigned
	83	extract_clock (
	84	struct cpufreq_acpi_io *data,
	85	unsigned value,
	86	unsigned int cpu)
	87	{
	88	unsigned long i;
	89
2d06d8c4	90	pr_debug("extract_clock\n");
4db8699b VP	91
4db8699b VP	92	for (i = 0; i < data->acpi_data.state_count; i++) {
17e77b1c	93	if (value == data->acpi_data.states[i].status)
4db8699b VP	94	return data->acpi_data.states[i].core_frequency;
	95	}
	96	return data->acpi_data.states[i-1].core_frequency;
	97	}
	98
	99
	100	static unsigned int
	101	processor_get_freq (
	102	struct cpufreq_acpi_io *data,
	103	unsigned int cpu)
	104	{
	105	int ret = 0;
	106	u32 value = 0;
	107	cpumask_t saved_mask;
	108	unsigned long clock_freq;
	109
2d06d8c4	110	pr_debug("processor_get_freq\n");
4db8699b VP	111
4db8699b VP	112	saved_mask = current->cpus_allowed;
552dce3a	113	set_cpus_allowed_ptr(current, cpumask_of(cpu));
182fdd22	114	if (smp_processor_id() != cpu)
4db8699b	115	goto migrate_end;
4db8699b	116
17e77b1c	117	/* processor_get_pstate gets the instantaneous frequency */
4db8699b VP	118	ret = processor_get_pstate(&value);
	119
	120	if (ret) {
552dce3a	121	set_cpus_allowed_ptr(current, &saved_mask);
4db8699b VP	122	printk(KERN_WARNING "get performance failed with error %d\n",
4db8699b VP	123	ret);
182fdd22	124	ret = 0;
4db8699b VP	125	goto migrate_end;
	126	}
	127	clock_freq = extract_clock(data, value, cpu);
	128	ret = (clock_freq*1000);
	129
	130	migrate_end:
552dce3a	131	set_cpus_allowed_ptr(current, &saved_mask);
4db8699b VP	132	return ret;
	133	}
	134
	135
	136	static int
	137	processor_set_freq (
	138	struct cpufreq_acpi_io *data,
b43a7ffb	139	struct cpufreq_policy *policy,
4db8699b VP	140	int state)
	141	{
	142	int ret = 0;
	143	u32 value = 0;
	144	struct cpufreq_freqs cpufreq_freqs;
	145	cpumask_t saved_mask;
	146	int retval;
	147
2d06d8c4	148	pr_debug("processor_set_freq\n");
4db8699b VP	149
4db8699b VP	150	saved_mask = current->cpus_allowed;
b43a7ffb VK	151	set_cpus_allowed_ptr(current, cpumask_of(policy->cpu));
b43a7ffb VK	152	if (smp_processor_id() != policy->cpu) {
4db8699b VP	153	retval = -EAGAIN;
	154	goto migrate_end;
	155	}
	156
	157	if (state == data->acpi_data.state) {
	158	if (unlikely(data->resume)) {
2d06d8c4	159	pr_debug("Called after resume, resetting to P%d\n", state);
4db8699b VP	160	data->resume = 0;
4db8699b VP	161	} else {
2d06d8c4	162	pr_debug("Already at target state (P%d)\n", state);
4db8699b VP	163	retval = 0;
	164	goto migrate_end;
	165	}
	166	}
	167
2d06d8c4	168	pr_debug("Transitioning from P%d to P%d\n",
4db8699b VP	169	data->acpi_data.state, state);
	170
	171	/* cpufreq frequency struct */
4db8699b VP	172	cpufreq_freqs.old = data->freq_table[data->acpi_data.state].frequency;
	173	cpufreq_freqs.new = data->freq_table[state].frequency;
	174
	175	/* notify cpufreq */
b43a7ffb	176	cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_PRECHANGE);
4db8699b VP	177
	178	/*
	179	* First we write the target state's 'control' value to the
	180	* control_register.
	181	*/
	182
	183	value = (u32) data->acpi_data.states[state].control;
	184
2d06d8c4	185	pr_debug("Transitioning to state: 0x%08x\n", value);
4db8699b VP	186
	187	ret = processor_set_pstate(value);
	188	if (ret) {
	189	unsigned int tmp = cpufreq_freqs.new;
b43a7ffb VK	190	cpufreq_notify_transition(policy, &cpufreq_freqs,
b43a7ffb VK	191	CPUFREQ_POSTCHANGE);
4db8699b VP	192	cpufreq_freqs.new = cpufreq_freqs.old;
4db8699b VP	193	cpufreq_freqs.old = tmp;
b43a7ffb VK	194	cpufreq_notify_transition(policy, &cpufreq_freqs,
	195	CPUFREQ_PRECHANGE);
	196	cpufreq_notify_transition(policy, &cpufreq_freqs,
	197	CPUFREQ_POSTCHANGE);
4db8699b VP	198	printk(KERN_WARNING "Transition failed with error %d\n", ret);
	199	retval = -ENODEV;
	200	goto migrate_end;
	201	}
	202
b43a7ffb	203	cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_POSTCHANGE);
4db8699b VP	204
	205	data->acpi_data.state = state;
	206
	207	retval = 0;
	208
	209	migrate_end:
552dce3a	210	set_cpus_allowed_ptr(current, &saved_mask);
4db8699b VP	211	return (retval);
	212	}
	213
	214
	215	static unsigned int
	216	acpi_cpufreq_get (
	217	unsigned int cpu)
	218	{
	219	struct cpufreq_acpi_io *data = acpi_io_data[cpu];
	220
2d06d8c4	221	pr_debug("acpi_cpufreq_get\n");
4db8699b VP	222
	223	return processor_get_freq(data, cpu);
	224	}
	225
	226
	227	static int
	228	acpi_cpufreq_target (
	229	struct cpufreq_policy *policy,
	230	unsigned int target_freq,
	231	unsigned int relation)
	232	{
	233	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
	234	unsigned int next_state = 0;
	235	unsigned int result = 0;
	236
2d06d8c4	237	pr_debug("acpi_cpufreq_setpolicy\n");
4db8699b VP	238
	239	result = cpufreq_frequency_table_target(policy,
	240	data->freq_table, target_freq, relation, &next_state);
	241	if (result)
	242	return (result);
	243
b43a7ffb	244	result = processor_set_freq(data, policy, next_state);
4db8699b VP	245
	246	return (result);
	247	}
	248
	249
	250	static int
	251	acpi_cpufreq_verify (
	252	struct cpufreq_policy *policy)
	253	{
	254	unsigned int result = 0;
	255	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
	256
2d06d8c4	257	pr_debug("acpi_cpufreq_verify\n");
4db8699b VP	258
	259	result = cpufreq_frequency_table_verify(policy,
	260	data->freq_table);
	261
	262	return (result);
	263	}
	264
	265
4db8699b VP	266	static int
	267	acpi_cpufreq_cpu_init (
	268	struct cpufreq_policy *policy)
	269	{
	270	unsigned int i;
	271	unsigned int cpu = policy->cpu;
	272	struct cpufreq_acpi_io *data;
	273	unsigned int result = 0;
	274
2d06d8c4	275	pr_debug("acpi_cpufreq_cpu_init\n");
4db8699b	276
36bcbec7	277	data = kzalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
4db8699b VP	278	if (!data)
	279	return (-ENOMEM);
	280
4db8699b VP	281	acpi_io_data[cpu] = data;
4db8699b VP	282
4db8699b	283	result = acpi_processor_register_performance(&data->acpi_data, cpu);
4db8699b VP	284
	285	if (result)
	286	goto err_free;
	287
	288	/* capability check */
	289	if (data->acpi_data.state_count <= 1) {
2d06d8c4	290	pr_debug("No P-States\n");
4db8699b VP	291	result = -ENODEV;
	292	goto err_unreg;
	293	}
	294
	295	if ((data->acpi_data.control_register.space_id !=
	296	ACPI_ADR_SPACE_FIXED_HARDWARE) \|\|
	297	(data->acpi_data.status_register.space_id !=
	298	ACPI_ADR_SPACE_FIXED_HARDWARE)) {
2d06d8c4	299	pr_debug("Unsupported address space [%d, %d]\n",
4db8699b VP	300	(u32) (data->acpi_data.control_register.space_id),
	301	(u32) (data->acpi_data.status_register.space_id));
	302	result = -ENODEV;
	303	goto err_unreg;
	304	}
	305
	306	/* alloc freq_table */
	307	data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
	308	(data->acpi_data.state_count + 1),
	309	GFP_KERNEL);
	310	if (!data->freq_table) {
	311	result = -ENOMEM;
	312	goto err_unreg;
	313	}
	314
	315	/* detect transition latency */
	316	policy->cpuinfo.transition_latency = 0;
	317	for (i=0; i<data->acpi_data.state_count; i++) {
	318	if ((data->acpi_data.states[i].transition_latency * 1000) >
	319	policy->cpuinfo.transition_latency) {
	320	policy->cpuinfo.transition_latency =
	321	data->acpi_data.states[i].transition_latency * 1000;
	322	}
	323	}
4db8699b VP	324	policy->cur = processor_get_freq(data, policy->cpu);
	325
	326	/* table init */
	327	for (i = 0; i <= data->acpi_data.state_count; i++)
	328	{
	329	data->freq_table[i].index = i;
	330	if (i < data->acpi_data.state_count) {
	331	data->freq_table[i].frequency =
	332	data->acpi_data.states[i].core_frequency * 1000;
	333	} else {
	334	data->freq_table[i].frequency = CPUFREQ_TABLE_END;
	335	}
	336	}
	337
	338	result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
	339	if (result) {
	340	goto err_freqfree;
	341	}
	342
	343	/* notify BIOS that we exist */
	344	acpi_processor_notify_smm(THIS_MODULE);
	345
	346	printk(KERN_INFO "acpi-cpufreq: CPU%u - ACPI performance management "
	347	"activated.\n", cpu);
	348
	349	for (i = 0; i < data->acpi_data.state_count; i++)
2d06d8c4	350	pr_debug(" %cP%d: %d MHz, %d mW, %d uS, %d uS, 0x%x 0x%x\n",
4db8699b VP	351	(i == data->acpi_data.state?'*':' '), i,
	352	(u32) data->acpi_data.states[i].core_frequency,
	353	(u32) data->acpi_data.states[i].power,
	354	(u32) data->acpi_data.states[i].transition_latency,
	355	(u32) data->acpi_data.states[i].bus_master_latency,
	356	(u32) data->acpi_data.states[i].status,
	357	(u32) data->acpi_data.states[i].control);
	358
	359	cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
	360
	361	/* the first call to ->target() should result in us actually
	362	* writing something to the appropriate registers. */
	363	data->resume = 1;
	364
	365	return (result);
	366
	367	err_freqfree:
	368	kfree(data->freq_table);
	369	err_unreg:
	370	acpi_processor_unregister_performance(&data->acpi_data, cpu);
	371	err_free:
	372	kfree(data);
	373	acpi_io_data[cpu] = NULL;
	374
	375	return (result);
	376	}
	377
	378
	379	static int
	380	acpi_cpufreq_cpu_exit (
	381	struct cpufreq_policy *policy)
	382	{
	383	struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
	384
2d06d8c4	385	pr_debug("acpi_cpufreq_cpu_exit\n");
4db8699b VP	386
	387	if (data) {
	388	cpufreq_frequency_table_put_attr(policy->cpu);
	389	acpi_io_data[policy->cpu] = NULL;
	390	acpi_processor_unregister_performance(&data->acpi_data,
	391	policy->cpu);
	392	kfree(data);
	393	}
	394
	395	return (0);
	396	}
	397
	398
	399	static struct freq_attr* acpi_cpufreq_attr[] = {
	400	&cpufreq_freq_attr_scaling_available_freqs,
	401	NULL,
	402	};
	403
	404
	405	static struct cpufreq_driver acpi_cpufreq_driver = {
	406	.verify = acpi_cpufreq_verify,
	407	.target = acpi_cpufreq_target,
	408	.get = acpi_cpufreq_get,
	409	.init = acpi_cpufreq_cpu_init,
	410	.exit = acpi_cpufreq_cpu_exit,
	411	.name = "acpi-cpufreq",
	412	.owner = THIS_MODULE,
	413	.attr = acpi_cpufreq_attr,
	414	};
	415
	416
	417	static int __init
	418	acpi_cpufreq_init (void)
	419	{
2d06d8c4	420	pr_debug("acpi_cpufreq_init\n");
4db8699b VP	421
	422	return cpufreq_register_driver(&acpi_cpufreq_driver);
	423	}
	424
	425
	426	static void __exit
	427	acpi_cpufreq_exit (void)
	428	{
2d06d8c4	429	pr_debug("acpi_cpufreq_exit\n");
4db8699b VP	430
	431	cpufreq_unregister_driver(&acpi_cpufreq_driver);
	432	return;
	433	}
	434
	435
	436	late_initcall(acpi_cpufreq_init);
	437	module_exit(acpi_cpufreq_exit);
	438