[linux.git] / drivers / cpufreq / sparc-us2e-cpufreq.c

// SPDX-License-Identifier: GPL-2.0-only
/* us2e_cpufreq.c: UltraSPARC-IIe cpu frequency support
 *
 * Copyright (C) 2003 David S. Miller ([email protected])
 *
 * Many thanks to Dominik Brodowski for fixing up the cpufreq
 * infrastructure in order to make this driver easier to implement.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/cpufreq.h>
#include <linux/threads.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>

#include <asm/asi.h>
#include <asm/timer.h>

static struct cpufreq_driver *cpufreq_us2e_driver;

struct us2e_freq_percpu_info {
	struct cpufreq_frequency_table table[6];
};

/* Indexed by cpu number. */
static struct us2e_freq_percpu_info *us2e_freq_table;

#define HBIRD_MEM_CNTL0_ADDR	0x1fe0000f010UL
#define HBIRD_ESTAR_MODE_ADDR	0x1fe0000f080UL

/* UltraSPARC-IIe has five dividers: 1, 2, 4, 6, and 8.  These are controlled
 * in the ESTAR mode control register.
 */
#define ESTAR_MODE_DIV_1	0x0000000000000000UL
#define ESTAR_MODE_DIV_2	0x0000000000000001UL
#define ESTAR_MODE_DIV_4	0x0000000000000003UL
#define ESTAR_MODE_DIV_6	0x0000000000000002UL
#define ESTAR_MODE_DIV_8	0x0000000000000004UL
#define ESTAR_MODE_DIV_MASK	0x0000000000000007UL

#define MCTRL0_SREFRESH_ENAB	0x0000000000010000UL
#define MCTRL0_REFR_COUNT_MASK	0x0000000000007f00UL
#define MCTRL0_REFR_COUNT_SHIFT	8
#define MCTRL0_REFR_INTERVAL	7800
#define MCTRL0_REFR_CLKS_P_CNT	64

static unsigned long read_hbreg(unsigned long addr)
{
	unsigned long ret;

	__asm__ __volatile__("ldxa	[%1] %2, %0"
			     : "=&r" (ret)
			     : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
	return ret;
}

static void write_hbreg(unsigned long addr, unsigned long val)
{
	__asm__ __volatile__("stxa	%0, [%1] %2\n\t"
			     "membar	#Sync"
			     : /* no outputs */
			     : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E)
			     : "memory");
	if (addr == HBIRD_ESTAR_MODE_ADDR) {
		/* Need to wait 16 clock cycles for the PLL to lock.  */
		udelay(1);
	}
}

static void self_refresh_ctl(int enable)
{
	unsigned long mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);

	if (enable)
		mctrl |= MCTRL0_SREFRESH_ENAB;
	else
		mctrl &= ~MCTRL0_SREFRESH_ENAB;
	write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
	(void) read_hbreg(HBIRD_MEM_CNTL0_ADDR);
}

static void frob_mem_refresh(int cpu_slowing_down,
			     unsigned long clock_tick,
			     unsigned long old_divisor, unsigned long divisor)
{
	unsigned long old_refr_count, refr_count, mctrl;

	refr_count  = (clock_tick * MCTRL0_REFR_INTERVAL);
	refr_count /= (MCTRL0_REFR_CLKS_P_CNT * divisor * 1000000000UL);

	mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
	old_refr_count = (mctrl & MCTRL0_REFR_COUNT_MASK)
		>> MCTRL0_REFR_COUNT_SHIFT;

	mctrl &= ~MCTRL0_REFR_COUNT_MASK;
	mctrl |= refr_count << MCTRL0_REFR_COUNT_SHIFT;
	write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
	mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);

	if (cpu_slowing_down && !(mctrl & MCTRL0_SREFRESH_ENAB)) {
		unsigned long usecs;

		/* We have to wait for both refresh counts (old
		 * and new) to go to zero.
		 */
		usecs = (MCTRL0_REFR_CLKS_P_CNT *
			 (refr_count + old_refr_count) *
			 1000000UL *
			 old_divisor) / clock_tick;
		udelay(usecs + 1UL);
	}
}

static void us2e_transition(unsigned long estar, unsigned long new_bits,
			    unsigned long clock_tick,
			    unsigned long old_divisor, unsigned long divisor)
{
	estar &= ~ESTAR_MODE_DIV_MASK;

	/* This is based upon the state transition diagram in the IIe manual.  */
	if (old_divisor == 2 && divisor == 1) {
		self_refresh_ctl(0);
		write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
		frob_mem_refresh(0, clock_tick, old_divisor, divisor);
	} else if (old_divisor == 1 && divisor == 2) {
		frob_mem_refresh(1, clock_tick, old_divisor, divisor);
		write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
		self_refresh_ctl(1);
	} else if (old_divisor == 1 && divisor > 2) {
		us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
				1, 2);
		us2e_transition(estar, new_bits, clock_tick,
				2, divisor);
	} else if (old_divisor > 2 && divisor == 1) {
		us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
				old_divisor, 2);
		us2e_transition(estar, new_bits, clock_tick,
				2, divisor);
	} else if (old_divisor < divisor) {
		frob_mem_refresh(0, clock_tick, old_divisor, divisor);
		write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
	} else if (old_divisor > divisor) {
		write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
		frob_mem_refresh(1, clock_tick, old_divisor, divisor);
	} else {
		BUG();
	}
}

static unsigned long index_to_estar_mode(unsigned int index)
{
	switch (index) {
	case 0:
		return ESTAR_MODE_DIV_1;

	case 1:
		return ESTAR_MODE_DIV_2;

	case 2:
		return ESTAR_MODE_DIV_4;

	case 3:
		return ESTAR_MODE_DIV_6;

	case 4:
		return ESTAR_MODE_DIV_8;

	default:
		BUG();
	}
}

static unsigned long index_to_divisor(unsigned int index)
{
	switch (index) {
	case 0:
		return 1;

	case 1:
		return 2;

	case 2:
		return 4;

	case 3:
		return 6;

	case 4:
		return 8;

	default:
		BUG();
	}
}

static unsigned long estar_to_divisor(unsigned long estar)
{
	unsigned long ret;

	switch (estar & ESTAR_MODE_DIV_MASK) {
	case ESTAR_MODE_DIV_1:
		ret = 1;
		break;
	case ESTAR_MODE_DIV_2:
		ret = 2;
		break;
	case ESTAR_MODE_DIV_4:
		ret = 4;
		break;
	case ESTAR_MODE_DIV_6:
		ret = 6;
		break;
	case ESTAR_MODE_DIV_8:
		ret = 8;
		break;
	default:
		BUG();
	}

	return ret;
}

static void __us2e_freq_get(void *arg)
{
	unsigned long *estar = arg;

	*estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
}

static unsigned int us2e_freq_get(unsigned int cpu)
{
	unsigned long clock_tick, estar;

	clock_tick = sparc64_get_clock_tick(cpu) / 1000;
	if (smp_call_function_single(cpu, __us2e_freq_get, &estar, 1))
		return 0;

	return clock_tick / estar_to_divisor(estar);
}

static void __us2e_freq_target(void *arg)
{
	unsigned int cpu = smp_processor_id();
	unsigned int *index = arg;
	unsigned long new_bits, new_freq;
	unsigned long clock_tick, divisor, old_divisor, estar;

	new_freq = clock_tick = sparc64_get_clock_tick(cpu) / 1000;
	new_bits = index_to_estar_mode(*index);
	divisor = index_to_divisor(*index);
	new_freq /= divisor;

	estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);

	old_divisor = estar_to_divisor(estar);

	if (old_divisor != divisor) {
		us2e_transition(estar, new_bits, clock_tick * 1000,
				old_divisor, divisor);
	}
}

static int us2e_freq_target(struct cpufreq_policy *policy, unsigned int index)
{
	unsigned int cpu = policy->cpu;

	return smp_call_function_single(cpu, __us2e_freq_target, &index, 1);
}

static int __init us2e_freq_cpu_init(struct cpufreq_policy *policy)
{
	unsigned int cpu = policy->cpu;
	unsigned long clock_tick = sparc64_get_clock_tick(cpu) / 1000;
	struct cpufreq_frequency_table *table =
		&us2e_freq_table[cpu].table[0];

	table[0].driver_data = 0;
	table[0].frequency = clock_tick / 1;
	table[1].driver_data = 1;
	table[1].frequency = clock_tick / 2;
	table[2].driver_data = 2;
	table[2].frequency = clock_tick / 4;
	table[2].driver_data = 3;
	table[2].frequency = clock_tick / 6;
	table[2].driver_data = 4;
	table[2].frequency = clock_tick / 8;
	table[2].driver_data = 5;
	table[3].frequency = CPUFREQ_TABLE_END;

	policy->cpuinfo.transition_latency = 0;
	policy->cur = clock_tick;
	policy->freq_table = table;

	return 0;
}

static int us2e_freq_cpu_exit(struct cpufreq_policy *policy)
{
	if (cpufreq_us2e_driver)
		us2e_freq_target(policy, 0);

	return 0;
}

static int __init us2e_freq_init(void)
{
	unsigned long manuf, impl, ver;
	int ret;

	if (tlb_type != spitfire)
		return -ENODEV;

	__asm__("rdpr %%ver, %0" : "=r" (ver));
	manuf = ((ver >> 48) & 0xffff);
	impl  = ((ver >> 32) & 0xffff);

	if (manuf == 0x17 && impl == 0x13) {
		struct cpufreq_driver *driver;

		ret = -ENOMEM;
		driver = kzalloc(sizeof(*driver), GFP_KERNEL);
		if (!driver)
			goto err_out;

		us2e_freq_table = kzalloc((NR_CPUS * sizeof(*us2e_freq_table)),
			GFP_KERNEL);
		if (!us2e_freq_table)
			goto err_out;

		driver->init = us2e_freq_cpu_init;
		driver->verify = cpufreq_generic_frequency_table_verify;
		driver->target_index = us2e_freq_target;
		driver->get = us2e_freq_get;
		driver->exit = us2e_freq_cpu_exit;
		strcpy(driver->name, "UltraSPARC-IIe");

		cpufreq_us2e_driver = driver;
		ret = cpufreq_register_driver(driver);
		if (ret)
			goto err_out;

		return 0;

err_out:
		if (driver) {
			kfree(driver);
			cpufreq_us2e_driver = NULL;
		}
		kfree(us2e_freq_table);
		us2e_freq_table = NULL;
		return ret;
	}

	return -ENODEV;
}

static void __exit us2e_freq_exit(void)
{
	if (cpufreq_us2e_driver) {
		cpufreq_unregister_driver(cpufreq_us2e_driver);
		kfree(cpufreq_us2e_driver);
		cpufreq_us2e_driver = NULL;
		kfree(us2e_freq_table);
		us2e_freq_table = NULL;
	}
}

MODULE_AUTHOR("David S. Miller <[email protected]>");
MODULE_DESCRIPTION("cpufreq driver for UltraSPARC-IIe");
MODULE_LICENSE("GPL");

module_init(us2e_freq_init);
module_exit(us2e_freq_exit);
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/* us2e_cpufreq.c: UltraSPARC-IIe cpu frequency support
	3	*
	4	* Copyright (C) 2003 David S. Miller ([email protected])
	5	*
	6	* Many thanks to Dominik Brodowski for fixing up the cpufreq
	7	* infrastructure in order to make this driver easier to implement.
	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/sched.h>
	13	#include <linux/smp.h>
	14	#include <linux/cpufreq.h>
	15	#include <linux/threads.h>
	16	#include <linux/slab.h>
	17	#include <linux/delay.h>
	18	#include <linux/init.h>
	19
	20	#include <asm/asi.h>
	21	#include <asm/timer.h>
	22
	23	static struct cpufreq_driver *cpufreq_us2e_driver;
	24
	25	struct us2e_freq_percpu_info {
	26	struct cpufreq_frequency_table table[6];
	27	};
	28
	29	/* Indexed by cpu number. */
	30	static struct us2e_freq_percpu_info *us2e_freq_table;
	31
	32	#define HBIRD_MEM_CNTL0_ADDR 0x1fe0000f010UL
	33	#define HBIRD_ESTAR_MODE_ADDR 0x1fe0000f080UL
	34
	35	/* UltraSPARC-IIe has five dividers: 1, 2, 4, 6, and 8. These are controlled
	36	* in the ESTAR mode control register.
	37	*/
	38	#define ESTAR_MODE_DIV_1 0x0000000000000000UL
	39	#define ESTAR_MODE_DIV_2 0x0000000000000001UL
	40	#define ESTAR_MODE_DIV_4 0x0000000000000003UL
	41	#define ESTAR_MODE_DIV_6 0x0000000000000002UL
	42	#define ESTAR_MODE_DIV_8 0x0000000000000004UL
	43	#define ESTAR_MODE_DIV_MASK 0x0000000000000007UL
	44
	45	#define MCTRL0_SREFRESH_ENAB 0x0000000000010000UL
	46	#define MCTRL0_REFR_COUNT_MASK 0x0000000000007f00UL
	47	#define MCTRL0_REFR_COUNT_SHIFT 8
	48	#define MCTRL0_REFR_INTERVAL 7800
	49	#define MCTRL0_REFR_CLKS_P_CNT 64
	50
	51	static unsigned long read_hbreg(unsigned long addr)
	52	{
	53	unsigned long ret;
	54
	55	__asm__ __volatile__("ldxa [%1] %2, %0"
	56	: "=&r" (ret)
	57	: "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
	58	return ret;
	59	}
	60
	61	static void write_hbreg(unsigned long addr, unsigned long val)
	62	{
	63	__asm__ __volatile__("stxa %0, [%1] %2\n\t"
	64	"membar #Sync"
	65	: /* no outputs */
66	: "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E)
67	: "memory");
68	if (addr == HBIRD_ESTAR_MODE_ADDR) {
69	/* Need to wait 16 clock cycles for the PLL to lock. */
70	udelay(1);
71	}
72	}
73
74	static void self_refresh_ctl(int enable)
75	{
76	unsigned long mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
77
78	if (enable)
79	mctrl \|= MCTRL0_SREFRESH_ENAB;
80	else
81	mctrl &= ~MCTRL0_SREFRESH_ENAB;
82	write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
83	(void) read_hbreg(HBIRD_MEM_CNTL0_ADDR);
84	}
85
86	static void frob_mem_refresh(int cpu_slowing_down,
87	unsigned long clock_tick,
88	unsigned long old_divisor, unsigned long divisor)
89	{
90	unsigned long old_refr_count, refr_count, mctrl;
91
1da177e4 LT	92	refr_count = (clock_tick * MCTRL0_REFR_INTERVAL);
	93	refr_count /= (MCTRL0_REFR_CLKS_P_CNT * divisor * 1000000000UL);
	94
	95	mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
	96	old_refr_count = (mctrl & MCTRL0_REFR_COUNT_MASK)
	97	>> MCTRL0_REFR_COUNT_SHIFT;
	98
	99	mctrl &= ~MCTRL0_REFR_COUNT_MASK;
	100	mctrl \|= refr_count << MCTRL0_REFR_COUNT_SHIFT;
	101	write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
	102	mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
	103
	104	if (cpu_slowing_down && !(mctrl & MCTRL0_SREFRESH_ENAB)) {
	105	unsigned long usecs;
	106
	107	/* We have to wait for both refresh counts (old
	108	* and new) to go to zero.
	109	*/
	110	usecs = (MCTRL0_REFR_CLKS_P_CNT *
	111	(refr_count + old_refr_count) *
	112	1000000UL *
	113	old_divisor) / clock_tick;
	114	udelay(usecs + 1UL);
	115	}
	116	}
	117
	118	static void us2e_transition(unsigned long estar, unsigned long new_bits,
	119	unsigned long clock_tick,
	120	unsigned long old_divisor, unsigned long divisor)
	121	{
1da177e4 LT	122	estar &= ~ESTAR_MODE_DIV_MASK;
	123
	124	/* This is based upon the state transition diagram in the IIe manual. */
	125	if (old_divisor == 2 && divisor == 1) {
	126	self_refresh_ctl(0);
	127	write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar \| new_bits);
	128	frob_mem_refresh(0, clock_tick, old_divisor, divisor);
	129	} else if (old_divisor == 1 && divisor == 2) {
	130	frob_mem_refresh(1, clock_tick, old_divisor, divisor);
	131	write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar \| new_bits);
	132	self_refresh_ctl(1);
	133	} else if (old_divisor == 1 && divisor > 2) {
	134	us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
	135	1, 2);
	136	us2e_transition(estar, new_bits, clock_tick,
	137	2, divisor);
	138	} else if (old_divisor > 2 && divisor == 1) {
	139	us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
	140	old_divisor, 2);
	141	us2e_transition(estar, new_bits, clock_tick,
	142	2, divisor);
	143	} else if (old_divisor < divisor) {
	144	frob_mem_refresh(0, clock_tick, old_divisor, divisor);
	145	write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar \| new_bits);
	146	} else if (old_divisor > divisor) {
	147	write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar \| new_bits);
	148	frob_mem_refresh(1, clock_tick, old_divisor, divisor);
	149	} else {
	150	BUG();
	151	}
1da177e4 LT	152	}
	153
	154	static unsigned long index_to_estar_mode(unsigned int index)
	155	{
	156	switch (index) {
	157	case 0:
	158	return ESTAR_MODE_DIV_1;
	159
	160	case 1:
	161	return ESTAR_MODE_DIV_2;
	162
	163	case 2:
	164	return ESTAR_MODE_DIV_4;
	165
	166	case 3:
	167	return ESTAR_MODE_DIV_6;
	168
	169	case 4:
	170	return ESTAR_MODE_DIV_8;
	171
	172	default:
	173	BUG();
6cb79b3f	174	}
1da177e4 LT	175	}
	176
	177	static unsigned long index_to_divisor(unsigned int index)
	178	{
	179	switch (index) {
	180	case 0:
	181	return 1;
	182
	183	case 1:
	184	return 2;
	185
	186	case 2:
	187	return 4;
	188
	189	case 3:
	190	return 6;
	191
	192	case 4:
	193	return 8;
	194
	195	default:
	196	BUG();
6cb79b3f	197	}
1da177e4 LT	198	}
	199
	200	static unsigned long estar_to_divisor(unsigned long estar)
	201	{
	202	unsigned long ret;
	203
	204	switch (estar & ESTAR_MODE_DIV_MASK) {
	205	case ESTAR_MODE_DIV_1:
	206	ret = 1;
	207	break;
	208	case ESTAR_MODE_DIV_2:
	209	ret = 2;
	210	break;
	211	case ESTAR_MODE_DIV_4:
	212	ret = 4;
	213	break;
	214	case ESTAR_MODE_DIV_6:
	215	ret = 6;
	216	break;
	217	case ESTAR_MODE_DIV_8:
	218	ret = 8;
	219	break;
	220	default:
	221	BUG();
6cb79b3f	222	}
1da177e4 LT	223
	224	return ret;
	225	}
	226
12699ac5 TG	227	static void __us2e_freq_get(void *arg)
	228	{
	229	unsigned long *estar = arg;
	230
	231	*estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
	232	}
	233
2cab224d DM	234	static unsigned int us2e_freq_get(unsigned int cpu)
2cab224d DM	235	{
2cab224d DM	236	unsigned long clock_tick, estar;
2cab224d DM	237
2cab224d	238	clock_tick = sparc64_get_clock_tick(cpu) / 1000;
12699ac5 TG	239	if (smp_call_function_single(cpu, __us2e_freq_get, &estar, 1))
12699ac5 TG	240	return 0;
2cab224d DM	241
	242	return clock_tick / estar_to_divisor(estar);
	243	}
	244
12699ac5	245	static void __us2e_freq_target(void *arg)
1da177e4	246	{
12699ac5 TG	247	unsigned int cpu = smp_processor_id();
12699ac5 TG	248	unsigned int *index = arg;
1da177e4 LT	249	unsigned long new_bits, new_freq;
1da177e4 LT	250	unsigned long clock_tick, divisor, old_divisor, estar;
1da177e4	251
2cab224d	252	new_freq = clock_tick = sparc64_get_clock_tick(cpu) / 1000;
12699ac5 TG	253	new_bits = index_to_estar_mode(*index);
12699ac5 TG	254	divisor = index_to_divisor(*index);
1da177e4 LT	255	new_freq /= divisor;
	256
	257	estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
	258
	259	old_divisor = estar_to_divisor(estar);
	260
12699ac5	261	if (old_divisor != divisor) {
2cab224d DM	262	us2e_transition(estar, new_bits, clock_tick * 1000,
2cab224d DM	263	old_divisor, divisor);
12699ac5 TG	264	}
12699ac5 TG	265	}
1da177e4	266
12699ac5 TG	267	static int us2e_freq_target(struct cpufreq_policy *policy, unsigned int index)
	268	{
	269	unsigned int cpu = policy->cpu;
1da177e4	270
12699ac5	271	return smp_call_function_single(cpu, __us2e_freq_target, &index, 1);
1da177e4 LT	272	}
1da177e4 LT	273
1da177e4 LT	274	static int __init us2e_freq_cpu_init(struct cpufreq_policy *policy)
	275	{
	276	unsigned int cpu = policy->cpu;
2cab224d	277	unsigned long clock_tick = sparc64_get_clock_tick(cpu) / 1000;
1da177e4 LT	278	struct cpufreq_frequency_table *table =
	279	&us2e_freq_table[cpu].table[0];
	280
50701588	281	table[0].driver_data = 0;
1da177e4	282	table[0].frequency = clock_tick / 1;
50701588	283	table[1].driver_data = 1;
1da177e4	284	table[1].frequency = clock_tick / 2;
50701588	285	table[2].driver_data = 2;
1da177e4	286	table[2].frequency = clock_tick / 4;
50701588	287	table[2].driver_data = 3;
1da177e4	288	table[2].frequency = clock_tick / 6;
50701588	289	table[2].driver_data = 4;
1da177e4	290	table[2].frequency = clock_tick / 8;
50701588	291	table[2].driver_data = 5;
1da177e4 LT	292	table[3].frequency = CPUFREQ_TABLE_END;
1da177e4 LT	293
1da177e4 LT	294	policy->cpuinfo.transition_latency = 0;
1da177e4 LT	295	policy->cur = clock_tick;
31f4b7a8	296	policy->freq_table = table;
1da177e4	297
31f4b7a8	298	return 0;
1da177e4 LT	299	}
	300
	301	static int us2e_freq_cpu_exit(struct cpufreq_policy *policy)
	302	{
e0b3165b	303	if (cpufreq_us2e_driver)
9c0ebcf7	304	us2e_freq_target(policy, 0);
1da177e4 LT	305
	306	return 0;
	307	}
	308
	309	static int __init us2e_freq_init(void)
	310	{
	311	unsigned long manuf, impl, ver;
	312	int ret;
	313
d82ace7d DM	314	if (tlb_type != spitfire)
	315	return -ENODEV;
	316
1da177e4 LT	317	__asm__("rdpr %%ver, %0" : "=r" (ver));
	318	manuf = ((ver >> 48) & 0xffff);
	319	impl = ((ver >> 32) & 0xffff);
	320
	321	if (manuf == 0x17 && impl == 0x13) {
	322	struct cpufreq_driver *driver;
	323
	324	ret = -ENOMEM;
d5b73cd8	325	driver = kzalloc(sizeof(*driver), GFP_KERNEL);
1da177e4 LT	326	if (!driver)
1da177e4 LT	327	goto err_out;
1da177e4	328
d5b73cd8	329	us2e_freq_table = kzalloc((NR_CPUS * sizeof(*us2e_freq_table)),
1da177e4 LT	330	GFP_KERNEL);
	331	if (!us2e_freq_table)
	332	goto err_out;
	333
2cab224d	334	driver->init = us2e_freq_cpu_init;
7a1874a0	335	driver->verify = cpufreq_generic_frequency_table_verify;
9c0ebcf7	336	driver->target_index = us2e_freq_target;
2cab224d	337	driver->get = us2e_freq_get;
1da177e4	338	driver->exit = us2e_freq_cpu_exit;
1da177e4 LT	339	strcpy(driver->name, "UltraSPARC-IIe");
	340
	341	cpufreq_us2e_driver = driver;
	342	ret = cpufreq_register_driver(driver);
	343	if (ret)
	344	goto err_out;
	345
	346	return 0;
	347
	348	err_out:
	349	if (driver) {
	350	kfree(driver);
	351	cpufreq_us2e_driver = NULL;
	352	}
b2325fe1 JJ	353	kfree(us2e_freq_table);
b2325fe1 JJ	354	us2e_freq_table = NULL;
1da177e4 LT	355	return ret;
	356	}
	357
	358	return -ENODEV;
	359	}
	360
	361	static void __exit us2e_freq_exit(void)
	362	{
	363	if (cpufreq_us2e_driver) {
	364	cpufreq_unregister_driver(cpufreq_us2e_driver);
1da177e4 LT	365	kfree(cpufreq_us2e_driver);
	366	cpufreq_us2e_driver = NULL;
	367	kfree(us2e_freq_table);
	368	us2e_freq_table = NULL;
	369	}
	370	}
	371
	372	MODULE_AUTHOR("David S. Miller <[email protected]>");
	373	MODULE_DESCRIPTION("cpufreq driver for UltraSPARC-IIe");
	374	MODULE_LICENSE("GPL");
	375
	376	module_init(us2e_freq_init);
	377	module_exit(us2e_freq_exit);