[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / cpufreq / powernow-k6.c

/*
 *  This file was based upon code in Powertweak Linux (http://powertweak.sf.net)
 *  (C) 2000-2003  Dave Jones, Arjan van de Ven, Janne Pänkälä,
 *                 Dominik Brodowski.
 *
 *  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/ioport.h>
#include <linux/timex.h>
#include <linux/io.h>

#include <asm/cpu_device_id.h>
#include <asm/msr.h>

#define POWERNOW_IOPORT 0xfff0          /* it doesn't matter where, as long
					   as it is unused */

#define PFX "powernow-k6: "
static unsigned int                     busfreq;   /* FSB, in 10 kHz */
static unsigned int                     max_multiplier;

static unsigned int			param_busfreq = 0;
static unsigned int			param_max_multiplier = 0;

module_param_named(max_multiplier, param_max_multiplier, uint, S_IRUGO);
MODULE_PARM_DESC(max_multiplier, "Maximum multiplier (allowed values: 20 30 35 40 45 50 55 60)");

module_param_named(bus_frequency, param_busfreq, uint, S_IRUGO);
MODULE_PARM_DESC(bus_frequency, "Bus frequency in kHz");

/* Clock ratio multiplied by 10 - see table 27 in AMD#23446 */
static struct cpufreq_frequency_table clock_ratio[] = {
	{60,  /* 110 -> 6.0x */ 0},
	{55,  /* 011 -> 5.5x */ 0},
	{50,  /* 001 -> 5.0x */ 0},
	{45,  /* 000 -> 4.5x */ 0},
	{40,  /* 010 -> 4.0x */ 0},
	{35,  /* 111 -> 3.5x */ 0},
	{30,  /* 101 -> 3.0x */ 0},
	{20,  /* 100 -> 2.0x */ 0},
	{0, CPUFREQ_TABLE_END}
};

static const u8 index_to_register[8] = { 6, 3, 1, 0, 2, 7, 5, 4 };
static const u8 register_to_index[8] = { 3, 2, 4, 1, 7, 6, 0, 5 };

static const struct {
	unsigned freq;
	unsigned mult;
} usual_frequency_table[] = {
	{ 400000, 40 },	// 100   * 4
	{ 450000, 45 }, // 100   * 4.5
	{ 475000, 50 }, //  95   * 5
	{ 500000, 50 }, // 100   * 5
	{ 506250, 45 }, // 112.5 * 4.5
	{ 533500, 55 }, //  97   * 5.5
	{ 550000, 55 }, // 100   * 5.5
	{ 562500, 50 }, // 112.5 * 5
	{ 570000, 60 }, //  95   * 6
	{ 600000, 60 }, // 100   * 6
	{ 618750, 55 }, // 112.5 * 5.5
	{ 660000, 55 }, // 120   * 5.5
	{ 675000, 60 }, // 112.5 * 6
	{ 720000, 60 }, // 120   * 6
};

#define FREQ_RANGE		3000

/**
 * powernow_k6_get_cpu_multiplier - returns the current FSB multiplier
 *
 * Returns the current setting of the frequency multiplier. Core clock
 * speed is frequency of the Front-Side Bus multiplied with this value.
 */
static int powernow_k6_get_cpu_multiplier(void)
{
	unsigned long invalue = 0;
	u32 msrval;

	local_irq_disable();

	msrval = POWERNOW_IOPORT + 0x1;
	wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
	invalue = inl(POWERNOW_IOPORT + 0x8);
	msrval = POWERNOW_IOPORT + 0x0;
	wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */

	local_irq_enable();

	return clock_ratio[register_to_index[(invalue >> 5)&7]].index;
}

static void powernow_k6_set_cpu_multiplier(unsigned int best_i)
{
	unsigned long outvalue, invalue;
	unsigned long msrval;
	unsigned long cr0;

	/* we now need to transform best_i to the BVC format, see AMD#23446 */

	/*
	 * The processor doesn't respond to inquiry cycles while changing the
	 * frequency, so we must disable cache.
	 */
	local_irq_disable();
	cr0 = read_cr0();
	write_cr0(cr0 | X86_CR0_CD);
	wbinvd();

	outvalue = (1<<12) | (1<<10) | (1<<9) | (index_to_register[best_i]<<5);

	msrval = POWERNOW_IOPORT + 0x1;
	wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
	invalue = inl(POWERNOW_IOPORT + 0x8);
	invalue = invalue & 0x1f;
	outvalue = outvalue | invalue;
	outl(outvalue, (POWERNOW_IOPORT + 0x8));
	msrval = POWERNOW_IOPORT + 0x0;
	wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */

	write_cr0(cr0);
	local_irq_enable();
}

/**
 * powernow_k6_set_state - set the PowerNow! multiplier
 * @best_i: clock_ratio[best_i] is the target multiplier
 *
 *   Tries to change the PowerNow! multiplier
 */
static void powernow_k6_set_state(struct cpufreq_policy *policy,
		unsigned int best_i)
{
	struct cpufreq_freqs freqs;

	if (clock_ratio[best_i].index > max_multiplier) {
		printk(KERN_ERR PFX "invalid target frequency\n");
		return;
	}

	freqs.old = busfreq * powernow_k6_get_cpu_multiplier();
	freqs.new = busfreq * clock_ratio[best_i].index;

	cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);

	powernow_k6_set_cpu_multiplier(best_i);

	cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);

	return;
}


/**
 * powernow_k6_verify - verifies a new CPUfreq policy
 * @policy: new policy
 *
 * Policy must be within lowest and highest possible CPU Frequency,
 * and at least one possible state must be within min and max.
 */
static int powernow_k6_verify(struct cpufreq_policy *policy)
{
	return cpufreq_frequency_table_verify(policy, &clock_ratio[0]);
}


/**
 * powernow_k6_setpolicy - sets a new CPUFreq policy
 * @policy: new policy
 * @target_freq: the target frequency
 * @relation: how that frequency relates to achieved frequency
 *  (CPUFREQ_RELATION_L or CPUFREQ_RELATION_H)
 *
 * sets a new CPUFreq policy
 */
static int powernow_k6_target(struct cpufreq_policy *policy,
			       unsigned int target_freq,
			       unsigned int relation)
{
	unsigned int newstate = 0;

	if (cpufreq_frequency_table_target(policy, &clock_ratio[0],
				target_freq, relation, &newstate))
		return -EINVAL;

	powernow_k6_set_state(policy, newstate);

	return 0;
}

static int powernow_k6_cpu_init(struct cpufreq_policy *policy)
{
	unsigned int i, f;
	int result;
	unsigned khz;

	if (policy->cpu != 0)
		return -ENODEV;

	max_multiplier = 0;
	khz = cpu_khz;
	for (i = 0; i < ARRAY_SIZE(usual_frequency_table); i++) {
		if (khz >= usual_frequency_table[i].freq - FREQ_RANGE &&
		    khz <= usual_frequency_table[i].freq + FREQ_RANGE) {
			khz = usual_frequency_table[i].freq;
			max_multiplier = usual_frequency_table[i].mult;
			break;
		}
	}
	if (param_max_multiplier) {
		for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) {
			if (clock_ratio[i].index == param_max_multiplier) {
				max_multiplier = param_max_multiplier;
				goto have_max_multiplier;
			}
		}
		printk(KERN_ERR "powernow-k6: invalid max_multiplier parameter, valid parameters 20, 30, 35, 40, 45, 50, 55, 60\n");
		return -EINVAL;
	}

	if (!max_multiplier) {
		printk(KERN_WARNING "powernow-k6: unknown frequency %u, cannot determine current multiplier\n", khz);
		printk(KERN_WARNING "powernow-k6: use module parameters max_multiplier and bus_frequency\n");
		return -EOPNOTSUPP;
	}

have_max_multiplier:
	param_max_multiplier = max_multiplier;

	if (param_busfreq) {
		if (param_busfreq >= 50000 && param_busfreq <= 150000) {
			busfreq = param_busfreq / 10;
			goto have_busfreq;
		}
		printk(KERN_ERR "powernow-k6: invalid bus_frequency parameter, allowed range 50000 - 150000 kHz\n");
		return -EINVAL;
	}

	busfreq = khz / max_multiplier;
have_busfreq:
	param_busfreq = busfreq * 10;

	/* table init */
	for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) {
		f = clock_ratio[i].index;
		if (f > max_multiplier)
			clock_ratio[i].frequency = CPUFREQ_ENTRY_INVALID;
		else
			clock_ratio[i].frequency = busfreq * f;
	}

	/* cpuinfo and default policy values */
	policy->cpuinfo.transition_latency = 500000;
	policy->cur = busfreq * max_multiplier;

	result = cpufreq_frequency_table_cpuinfo(policy, clock_ratio);
	if (result)
		return result;

	cpufreq_frequency_table_get_attr(clock_ratio, policy->cpu);

	return 0;
}


static int powernow_k6_cpu_exit(struct cpufreq_policy *policy)
{
	unsigned int i;
	for (i = 0; i < 8; i++) {
		if (i == max_multiplier)
			powernow_k6_set_state(policy, i);
	}
	cpufreq_frequency_table_put_attr(policy->cpu);
	return 0;
}

static unsigned int powernow_k6_get(unsigned int cpu)
{
	unsigned int ret;
	ret = (busfreq * powernow_k6_get_cpu_multiplier());
	return ret;
}

static struct freq_attr *powernow_k6_attr[] = {
	&cpufreq_freq_attr_scaling_available_freqs,
	NULL,
};

static struct cpufreq_driver powernow_k6_driver = {
	.verify		= powernow_k6_verify,
	.target		= powernow_k6_target,
	.init		= powernow_k6_cpu_init,
	.exit		= powernow_k6_cpu_exit,
	.get		= powernow_k6_get,
	.name		= "powernow-k6",
	.owner		= THIS_MODULE,
	.attr		= powernow_k6_attr,
};

static const struct x86_cpu_id powernow_k6_ids[] = {
	{ X86_VENDOR_AMD, 5, 12 },
	{ X86_VENDOR_AMD, 5, 13 },
	{}
};
MODULE_DEVICE_TABLE(x86cpu, powernow_k6_ids);

/**
 * powernow_k6_init - initializes the k6 PowerNow! CPUFreq driver
 *
 *   Initializes the K6 PowerNow! support. Returns -ENODEV on unsupported
 * devices, -EINVAL or -ENOMEM on problems during initiatization, and zero
 * on success.
 */
static int __init powernow_k6_init(void)
{
	if (!x86_match_cpu(powernow_k6_ids))
		return -ENODEV;

	if (!request_region(POWERNOW_IOPORT, 16, "PowerNow!")) {
		printk(KERN_INFO PFX "PowerNow IOPORT region already used.\n");
		return -EIO;
	}

	if (cpufreq_register_driver(&powernow_k6_driver)) {
		release_region(POWERNOW_IOPORT, 16);
		return -EINVAL;
	}

	return 0;
}


/**
 * powernow_k6_exit - unregisters AMD K6-2+/3+ PowerNow! support
 *
 *   Unregisters AMD K6-2+ / K6-3+ PowerNow! support.
 */
static void __exit powernow_k6_exit(void)
{
	cpufreq_unregister_driver(&powernow_k6_driver);
	release_region(POWERNOW_IOPORT, 16);
}


MODULE_AUTHOR("Arjan van de Ven, Dave Jones <davej@redhat.com>, "
		"Dominik Brodowski <linux@brodo.de>");
MODULE_DESCRIPTION("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");
MODULE_LICENSE("GPL");

module_init(powernow_k6_init);
module_exit(powernow_k6_exit);
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* This file was based upon code in Powertweak Linux (http://powertweak.sf.net)
14a6650f DJ	3	* (C) 2000-2003 Dave Jones, Arjan van de Ven, Janne Pänkälä,
14a6650f DJ	4	* Dominik Brodowski.
1da177e4 LT	5	*
	6	* Licensed under the terms of the GNU GPL License version 2.
	7	*
	8	* BIG FAT DISCLAIMER: Work in progress code. Possibly dangerous
	9	*/
	10
	11	#include <linux/kernel.h>
32ee8c3e	12	#include <linux/module.h>
1da177e4 LT	13	#include <linux/init.h>
	14	#include <linux/cpufreq.h>
	15	#include <linux/ioport.h>
8d2d2051 PC	16	#include <linux/timex.h>
8d2d2051 PC	17	#include <linux/io.h>
1da177e4	18
fa8031ae	19	#include <asm/cpu_device_id.h>
14a6650f DJ	20	#include <asm/msr.h>
14a6650f DJ	21
8d2d2051 PC	22	#define POWERNOW_IOPORT 0xfff0 /* it doesn't matter where, as long
8d2d2051 PC	23	as it is unused */
1da177e4	24
14a6650f	25	#define PFX "powernow-k6: "
1da177e4 LT	26	static unsigned int busfreq; /* FSB, in 10 kHz */
	27	static unsigned int max_multiplier;
	28
59b61f4d MP	29	static unsigned int param_busfreq = 0;
	30	static unsigned int param_max_multiplier = 0;
	31
	32	module_param_named(max_multiplier, param_max_multiplier, uint, S_IRUGO);
	33	MODULE_PARM_DESC(max_multiplier, "Maximum multiplier (allowed values: 20 30 35 40 45 50 55 60)");
	34
	35	module_param_named(bus_frequency, param_busfreq, uint, S_IRUGO);
	36	MODULE_PARM_DESC(bus_frequency, "Bus frequency in kHz");
1da177e4 LT	37
	38	/* Clock ratio multiplied by 10 - see table 27 in AMD#23446 */
	39	static struct cpufreq_frequency_table clock_ratio[] = {
45deaa3b MP	40	{60, /* 110 -> 6.0x */ 0},
45deaa3b MP	41	{55, /* 011 -> 5.5x */ 0},
1da177e4	42	{50, /* 001 -> 5.0x */ 0},
45deaa3b	43	{45, /* 000 -> 4.5x */ 0},
1da177e4	44	{40, /* 010 -> 4.0x */ 0},
1da177e4	45	{35, /* 111 -> 3.5x */ 0},
45deaa3b MP	46	{30, /* 101 -> 3.0x */ 0},
45deaa3b MP	47	{20, /* 100 -> 2.0x */ 0},
1da177e4 LT	48	{0, CPUFREQ_TABLE_END}
	49	};
	50
45deaa3b MP	51	static const u8 index_to_register[8] = { 6, 3, 1, 0, 2, 7, 5, 4 };
	52	static const u8 register_to_index[8] = { 3, 2, 4, 1, 7, 6, 0, 5 };
	53
59b61f4d MP	54	static const struct {
	55	unsigned freq;
	56	unsigned mult;
	57	} usual_frequency_table[] = {
	58	{ 400000, 40 }, // 100 * 4
	59	{ 450000, 45 }, // 100 * 4.5
	60	{ 475000, 50 }, // 95 * 5
	61	{ 500000, 50 }, // 100 * 5
	62	{ 506250, 45 }, // 112.5 * 4.5
	63	{ 533500, 55 }, // 97 * 5.5
	64	{ 550000, 55 }, // 100 * 5.5
	65	{ 562500, 50 }, // 112.5 * 5
	66	{ 570000, 60 }, // 95 * 6
	67	{ 600000, 60 }, // 100 * 6
	68	{ 618750, 55 }, // 112.5 * 5.5
	69	{ 660000, 55 }, // 120 * 5.5
	70	{ 675000, 60 }, // 112.5 * 6
	71	{ 720000, 60 }, // 120 * 6
	72	};
	73
	74	#define FREQ_RANGE 3000
1da177e4 LT	75
	76	/**
	77	* powernow_k6_get_cpu_multiplier - returns the current FSB multiplier
	78	*
cfc83ee6	79	* Returns the current setting of the frequency multiplier. Core clock
1da177e4 LT	80	* speed is frequency of the Front-Side Bus multiplied with this value.
	81	*/
	82	static int powernow_k6_get_cpu_multiplier(void)
	83	{
cfc83ee6	84	unsigned long invalue = 0;
14a6650f	85	u32 msrval;
32ee8c3e	86
cfc83ee6 MP	87	local_irq_disable();
cfc83ee6 MP	88
1da177e4 LT	89	msrval = POWERNOW_IOPORT + 0x1;
1da177e4 LT	90	wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
8d2d2051	91	invalue = inl(POWERNOW_IOPORT + 0x8);
1da177e4 LT	92	msrval = POWERNOW_IOPORT + 0x0;
	93	wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
	94
cfc83ee6 MP	95	local_irq_enable();
cfc83ee6 MP	96
45deaa3b	97	return clock_ratio[register_to_index[(invalue >> 5)&7]].index;
1da177e4 LT	98	}
1da177e4 LT	99
cfc83ee6 MP	100	static void powernow_k6_set_cpu_multiplier(unsigned int best_i)
	101	{
	102	unsigned long outvalue, invalue;
	103	unsigned long msrval;
	104	unsigned long cr0;
	105
	106	/* we now need to transform best_i to the BVC format, see AMD#23446 */
	107
	108	/*
	109	* The processor doesn't respond to inquiry cycles while changing the
	110	* frequency, so we must disable cache.
	111	*/
	112	local_irq_disable();
	113	cr0 = read_cr0();
	114	write_cr0(cr0 \| X86_CR0_CD);
	115	wbinvd();
	116
45deaa3b	117	outvalue = (1<<12) \| (1<<10) \| (1<<9) \| (index_to_register[best_i]<<5);
cfc83ee6 MP	118
	119	msrval = POWERNOW_IOPORT + 0x1;
	120	wrmsr(MSR_K6_EPMR, msrval, 0); /* enable the PowerNow port */
	121	invalue = inl(POWERNOW_IOPORT + 0x8);
	122	invalue = invalue & 0x1f;
	123	outvalue = outvalue \| invalue;
	124	outl(outvalue, (POWERNOW_IOPORT + 0x8));
	125	msrval = POWERNOW_IOPORT + 0x0;
	126	wrmsr(MSR_K6_EPMR, msrval, 0); /* disable it again */
	127
	128	write_cr0(cr0);
	129	local_irq_enable();
	130	}
1da177e4 LT	131
	132	/**
	133	* powernow_k6_set_state - set the PowerNow! multiplier
	134	* @best_i: clock_ratio[best_i] is the target multiplier
	135	*
	136	* Tries to change the PowerNow! multiplier
	137	*/
b43a7ffb VK	138	static void powernow_k6_set_state(struct cpufreq_policy *policy,
b43a7ffb VK	139	unsigned int best_i)
1da177e4	140	{
14a6650f	141	struct cpufreq_freqs freqs;
1da177e4 LT	142
1da177e4 LT	143	if (clock_ratio[best_i].index > max_multiplier) {
14a6650f	144	printk(KERN_ERR PFX "invalid target frequency\n");
1da177e4 LT	145	return;
	146	}
	147
	148	freqs.old = busfreq * powernow_k6_get_cpu_multiplier();
	149	freqs.new = busfreq * clock_ratio[best_i].index;
32ee8c3e	150
b43a7ffb	151	cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
1da177e4	152
cfc83ee6	153	powernow_k6_set_cpu_multiplier(best_i);
1da177e4	154
b43a7ffb	155	cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
1da177e4 LT	156
	157	return;
	158	}
	159
	160
	161	/**
	162	* powernow_k6_verify - verifies a new CPUfreq policy
	163	* @policy: new policy
	164	*
	165	* Policy must be within lowest and highest possible CPU Frequency,
	166	* and at least one possible state must be within min and max.
	167	*/
	168	static int powernow_k6_verify(struct cpufreq_policy *policy)
	169	{
	170	return cpufreq_frequency_table_verify(policy, &clock_ratio[0]);
	171	}
	172
	173
	174	/**
	175	* powernow_k6_setpolicy - sets a new CPUFreq policy
	176	* @policy: new policy
	177	* @target_freq: the target frequency
14a6650f DJ	178	* @relation: how that frequency relates to achieved frequency
14a6650f DJ	179	* (CPUFREQ_RELATION_L or CPUFREQ_RELATION_H)
1da177e4 LT	180	*
	181	* sets a new CPUFreq policy
	182	*/
8d2d2051	183	static int powernow_k6_target(struct cpufreq_policy *policy,
1da177e4 LT	184	unsigned int target_freq,
	185	unsigned int relation)
	186	{
14a6650f	187	unsigned int newstate = 0;
1da177e4	188
14a6650f DJ	189	if (cpufreq_frequency_table_target(policy, &clock_ratio[0],
14a6650f DJ	190	target_freq, relation, &newstate))
1da177e4 LT	191	return -EINVAL;
1da177e4 LT	192
b43a7ffb	193	powernow_k6_set_state(policy, newstate);
1da177e4 LT	194
	195	return 0;
	196	}
	197
1da177e4 LT	198	static int powernow_k6_cpu_init(struct cpufreq_policy *policy)
1da177e4 LT	199	{
14a6650f	200	unsigned int i, f;
1da177e4	201	int result;
59b61f4d	202	unsigned khz;
1da177e4 LT	203
	204	if (policy->cpu != 0)
	205	return -ENODEV;
	206
59b61f4d MP	207	max_multiplier = 0;
	208	khz = cpu_khz;
	209	for (i = 0; i < ARRAY_SIZE(usual_frequency_table); i++) {
	210	if (khz >= usual_frequency_table[i].freq - FREQ_RANGE &&
	211	khz <= usual_frequency_table[i].freq + FREQ_RANGE) {
	212	khz = usual_frequency_table[i].freq;
	213	max_multiplier = usual_frequency_table[i].mult;
	214	break;
	215	}
	216	}
	217	if (param_max_multiplier) {
	218	for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) {
	219	if (clock_ratio[i].index == param_max_multiplier) {
	220	max_multiplier = param_max_multiplier;
	221	goto have_max_multiplier;
	222	}
	223	}
	224	printk(KERN_ERR "powernow-k6: invalid max_multiplier parameter, valid parameters 20, 30, 35, 40, 45, 50, 55, 60\n");
	225	return -EINVAL;
	226	}
	227
	228	if (!max_multiplier) {
	229	printk(KERN_WARNING "powernow-k6: unknown frequency %u, cannot determine current multiplier\n", khz);
	230	printk(KERN_WARNING "powernow-k6: use module parameters max_multiplier and bus_frequency\n");
	231	return -EOPNOTSUPP;
	232	}
	233
	234	have_max_multiplier:
	235	param_max_multiplier = max_multiplier;
	236
	237	if (param_busfreq) {
	238	if (param_busfreq >= 50000 && param_busfreq <= 150000) {
	239	busfreq = param_busfreq / 10;
	240	goto have_busfreq;
	241	}
	242	printk(KERN_ERR "powernow-k6: invalid bus_frequency parameter, allowed range 50000 - 150000 kHz\n");
	243	return -EINVAL;
	244	}
	245
	246	busfreq = khz / max_multiplier;
	247	have_busfreq:
	248	param_busfreq = busfreq * 10;
1da177e4 LT	249
1da177e4 LT	250	/* table init */
8d2d2051	251	for (i = 0; (clock_ratio[i].frequency != CPUFREQ_TABLE_END); i++) {
14a6650f DJ	252	f = clock_ratio[i].index;
14a6650f DJ	253	if (f > max_multiplier)
1da177e4 LT	254	clock_ratio[i].frequency = CPUFREQ_ENTRY_INVALID;
1da177e4 LT	255	else
14a6650f	256	clock_ratio[i].frequency = busfreq * f;
1da177e4 LT	257	}
	258
	259	/* cpuinfo and default policy values */
cfc83ee6	260	policy->cpuinfo.transition_latency = 500000;
1da177e4 LT	261	policy->cur = busfreq * max_multiplier;
	262
	263	result = cpufreq_frequency_table_cpuinfo(policy, clock_ratio);
	264	if (result)
8d2d2051	265	return result;
1da177e4 LT	266
	267	cpufreq_frequency_table_get_attr(clock_ratio, policy->cpu);
	268
	269	return 0;
	270	}
	271
	272
	273	static int powernow_k6_cpu_exit(struct cpufreq_policy *policy)
	274	{
	275	unsigned int i;
8d2d2051 PC	276	for (i = 0; i < 8; i++) {
8d2d2051 PC	277	if (i == max_multiplier)
b43a7ffb	278	powernow_k6_set_state(policy, i);
1da177e4 LT	279	}
1da177e4 LT	280	cpufreq_frequency_table_put_attr(policy->cpu);
32ee8c3e	281	return 0;
1da177e4 LT	282	}
	283
	284	static unsigned int powernow_k6_get(unsigned int cpu)
	285	{
14a6650f DJ	286	unsigned int ret;
	287	ret = (busfreq * powernow_k6_get_cpu_multiplier());
	288	return ret;
1da177e4 LT	289	}
1da177e4 LT	290
8d2d2051	291	static struct freq_attr *powernow_k6_attr[] = {
1da177e4 LT	292	&cpufreq_freq_attr_scaling_available_freqs,
	293	NULL,
	294	};
	295
221dee28	296	static struct cpufreq_driver powernow_k6_driver = {
32ee8c3e DJ	297	.verify = powernow_k6_verify,
32ee8c3e DJ	298	.target = powernow_k6_target,
1da177e4 LT	299	.init = powernow_k6_cpu_init,
	300	.exit = powernow_k6_cpu_exit,
	301	.get = powernow_k6_get,
	302	.name = "powernow-k6",
	303	.owner = THIS_MODULE,
	304	.attr = powernow_k6_attr,
	305	};
	306
fa8031ae AK	307	static const struct x86_cpu_id powernow_k6_ids[] = {
	308	{ X86_VENDOR_AMD, 5, 12 },
	309	{ X86_VENDOR_AMD, 5, 13 },
	310	{}
	311	};
b4d2d231	312	MODULE_DEVICE_TABLE(x86cpu, powernow_k6_ids);
1da177e4 LT	313
	314	/**
	315	* powernow_k6_init - initializes the k6 PowerNow! CPUFreq driver
	316	*
	317	* Initializes the K6 PowerNow! support. Returns -ENODEV on unsupported
	318	* devices, -EINVAL or -ENOMEM on problems during initiatization, and zero
	319	* on success.
	320	*/
	321	static int __init powernow_k6_init(void)
32ee8c3e	322	{
fa8031ae	323	if (!x86_match_cpu(powernow_k6_ids))
1da177e4 LT	324	return -ENODEV;
	325
	326	if (!request_region(POWERNOW_IOPORT, 16, "PowerNow!")) {
14a6650f	327	printk(KERN_INFO PFX "PowerNow IOPORT region already used.\n");
1da177e4 LT	328	return -EIO;
	329	}
	330
	331	if (cpufreq_register_driver(&powernow_k6_driver)) {
8d2d2051	332	release_region(POWERNOW_IOPORT, 16);
1da177e4 LT	333	return -EINVAL;
	334	}
	335
	336	return 0;
	337	}
	338
	339
	340	/**
	341	* powernow_k6_exit - unregisters AMD K6-2+/3+ PowerNow! support
	342	*
	343	* Unregisters AMD K6-2+ / K6-3+ PowerNow! support.
	344	*/
	345	static void __exit powernow_k6_exit(void)
	346	{
	347	cpufreq_unregister_driver(&powernow_k6_driver);
8d2d2051	348	release_region(POWERNOW_IOPORT, 16);
1da177e4 LT	349	}
	350
	351
14a6650f DJ	352	MODULE_AUTHOR("Arjan van de Ven, Dave Jones <davej@redhat.com>, "
14a6650f DJ	353	"Dominik Brodowski <linux@brodo.de>");
8d2d2051 PC	354	MODULE_DESCRIPTION("PowerNow! driver for AMD K6-2+ / K6-3+ processors.");
8d2d2051 PC	355	MODULE_LICENSE("GPL");
1da177e4 LT	356
	357	module_init(powernow_k6_init);
	358	module_exit(powernow_k6_exit);