[deliverable/linux.git] / arch / frv / kernel / pm.c

/*
 * FR-V Power Management Routines
 *
 * Copyright (c) 2004 Red Hat, Inc.
 *
 * Based on SA1100 version:
 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/pm_legacy.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/sysctl.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <asm/uaccess.h>

#include <asm/mb86943a.h>

#include "local.h"

/*
 * Debug macros
 */
#define DEBUG

int pm_do_suspend(void)
{
	local_irq_disable();

	__set_LEDS(0xb1);

	/* go zzz */
	frv_cpu_suspend(pdm_suspend_mode);

	__set_LEDS(0xb2);

	local_irq_enable();

	return 0;
}

static unsigned long __irq_mask;

/*
 * Setup interrupt masks, etc to enable wakeup by power switch
 */
static void __default_power_switch_setup(void)
{
	/* default is to mask all interrupt sources. */
	__irq_mask = *(unsigned long *)0xfeff9820;
	*(unsigned long *)0xfeff9820 = 0xfffe0000;
}

/*
 * Cleanup interrupt masks, etc after wakeup by power switch
 */
static void __default_power_switch_cleanup(void)
{
	*(unsigned long *)0xfeff9820 = __irq_mask;
}

/*
 * Return non-zero if wakeup irq was caused by power switch
 */
static int __default_power_switch_check(void)
{
	return 1;
}

void (*__power_switch_wake_setup)(void) = __default_power_switch_setup;
int  (*__power_switch_wake_check)(void) = __default_power_switch_check;
void (*__power_switch_wake_cleanup)(void) = __default_power_switch_cleanup;

int pm_do_bus_sleep(void)
{
	local_irq_disable();

	/*
         * Here is where we need some platform-dependent setup
	 * of the interrupt state so that appropriate wakeup
	 * sources are allowed and all others are masked.
	 */
	__power_switch_wake_setup();

	__set_LEDS(0xa1);

	/* go zzz
	 *
	 * This is in a loop in case power switch shares an irq with other
	 * devices. The wake_check() tells us if we need to finish waking
	 * or go back to sleep.
	 */
	do {
		frv_cpu_suspend(HSR0_PDM_BUS_SLEEP);
	} while (__power_switch_wake_check && !__power_switch_wake_check());

	__set_LEDS(0xa2);

	/*
         * Here is where we need some platform-dependent restore
	 * of the interrupt state prior to being called.
	 */
	__power_switch_wake_cleanup();

	local_irq_enable();

	return 0;
}

unsigned long sleep_phys_sp(void *sp)
{
	return virt_to_phys(sp);
}

#ifdef CONFIG_SYSCTL
/*
 * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
 * when all the PM interfaces exist nicely.
 */
#define CTL_PM_SUSPEND 1
#define CTL_PM_CMODE 2
#define CTL_PM_P0 4
#define CTL_PM_CM 5

static int user_atoi(char __user *ubuf, size_t len)
{
	char buf[16];
	unsigned long ret;

	if (len > 15)
		return -EINVAL;

	if (copy_from_user(buf, ubuf, len))
		return -EFAULT;

	buf[len] = 0;
	ret = simple_strtoul(buf, NULL, 0);
	if (ret > INT_MAX)
		return -ERANGE;
	return ret;
}

/*
 * Send us to sleep.
 */
static int sysctl_pm_do_suspend(ctl_table *ctl, int write, struct file *filp,
				void __user *buffer, size_t *lenp, loff_t *fpos)
{
	int retval, mode;

	if (*lenp <= 0)
		return -EIO;

	mode = user_atoi(buffer, *lenp);
	if ((mode != 1) && (mode != 5))
		return -EINVAL;

	retval = pm_send_all(PM_SUSPEND, (void *)3);

	if (retval == 0) {
		if (mode == 5)
		    retval = pm_do_bus_sleep();
		else
		    retval = pm_do_suspend();
		pm_send_all(PM_RESUME, (void *)0);
	}

	return retval;
}

static int try_set_cmode(int new_cmode)
{
	if (new_cmode > 15)
		return -EINVAL;
	if (!(clock_cmodes_permitted & (1<<new_cmode)))
		return -EINVAL;

	/* tell all the drivers we're suspending */
	pm_send_all(PM_SUSPEND, (void *)3);

	/* now change cmode */
	local_irq_disable();
	frv_dma_pause_all();

	frv_change_cmode(new_cmode);

	determine_clocks(0);
	time_divisor_init();

#ifdef DEBUG
	determine_clocks(1);
#endif
	frv_dma_resume_all();
	local_irq_enable();

	/* tell all the drivers we're resuming */
	pm_send_all(PM_RESUME, (void *)0);
	return 0;
}


static int cmode_procctl(ctl_table *ctl, int write, struct file *filp,
			 void __user *buffer, size_t *lenp, loff_t *fpos)
{
	int new_cmode;

	if (!write)
		return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);

	new_cmode = user_atoi(buffer, *lenp);

	return try_set_cmode(new_cmode)?:*lenp;
}

static int cmode_sysctl(ctl_table *table, int __user *name, int nlen,
			void __user *oldval, size_t __user *oldlenp,
			void __user *newval, size_t newlen)
{
	if (oldval && oldlenp) {
		size_t oldlen;

		if (get_user(oldlen, oldlenp))
			return -EFAULT;

		if (oldlen != sizeof(int))
			return -EINVAL;

		if (put_user(clock_cmode_current, (unsigned __user *)oldval) ||
		    put_user(sizeof(int), oldlenp))
			return -EFAULT;
	}
	if (newval && newlen) {
		int new_cmode;

		if (newlen != sizeof(int))
			return -EINVAL;

		if (get_user(new_cmode, (int __user *)newval))
			return -EFAULT;

		return try_set_cmode(new_cmode)?:1;
	}
	return 1;
}

static int try_set_p0(int new_p0)
{
	unsigned long flags, clkc;

	if (new_p0 < 0 || new_p0 > 1)
		return -EINVAL;

	local_irq_save(flags);
	__set_PSR(flags & ~PSR_ET);

	frv_dma_pause_all();

	clkc = __get_CLKC();
	if (new_p0)
		clkc |= CLKC_P0;
	else
		clkc &= ~CLKC_P0;
	__set_CLKC(clkc);

	determine_clocks(0);
	time_divisor_init();

#ifdef DEBUG
	determine_clocks(1);
#endif
	frv_dma_resume_all();
	local_irq_restore(flags);
	return 0;
}

static int try_set_cm(int new_cm)
{
	unsigned long flags, clkc;

	if (new_cm < 0 || new_cm > 1)
		return -EINVAL;

	local_irq_save(flags);
	__set_PSR(flags & ~PSR_ET);

	frv_dma_pause_all();

	clkc = __get_CLKC();
	clkc &= ~CLKC_CM;
	clkc |= new_cm;
	__set_CLKC(clkc);

	determine_clocks(0);
	time_divisor_init();

#if 1 //def DEBUG
	determine_clocks(1);
#endif

	frv_dma_resume_all();
	local_irq_restore(flags);
	return 0;
}

static int p0_procctl(ctl_table *ctl, int write, struct file *filp,
		      void __user *buffer, size_t *lenp, loff_t *fpos)
{
	int new_p0;

	if (!write)
		return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);

	new_p0 = user_atoi(buffer, *lenp);

	return try_set_p0(new_p0)?:*lenp;
}

static int p0_sysctl(ctl_table *table, int __user *name, int nlen,
		     void __user *oldval, size_t __user *oldlenp,
		     void __user *newval, size_t newlen)
{
	if (oldval && oldlenp) {
		size_t oldlen;

		if (get_user(oldlen, oldlenp))
			return -EFAULT;

		if (oldlen != sizeof(int))
			return -EINVAL;

		if (put_user(clock_p0_current, (unsigned __user *)oldval) ||
		    put_user(sizeof(int), oldlenp))
			return -EFAULT;
	}
	if (newval && newlen) {
		int new_p0;

		if (newlen != sizeof(int))
			return -EINVAL;

		if (get_user(new_p0, (int __user *)newval))
			return -EFAULT;

		return try_set_p0(new_p0)?:1;
	}
	return 1;
}

static int cm_procctl(ctl_table *ctl, int write, struct file *filp,
		      void __user *buffer, size_t *lenp, loff_t *fpos)
{
	int new_cm;

	if (!write)
		return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);

	new_cm = user_atoi(buffer, *lenp);

	return try_set_cm(new_cm)?:*lenp;
}

static int cm_sysctl(ctl_table *table, int __user *name, int nlen,
		     void __user *oldval, size_t __user *oldlenp,
		     void __user *newval, size_t newlen)
{
	if (oldval && oldlenp) {
		size_t oldlen;

		if (get_user(oldlen, oldlenp))
			return -EFAULT;

		if (oldlen != sizeof(int))
			return -EINVAL;

		if (put_user(clock_cm_current, (unsigned __user *)oldval) ||
		    put_user(sizeof(int), oldlenp))
			return -EFAULT;
	}
	if (newval && newlen) {
		int new_cm;

		if (newlen != sizeof(int))
			return -EINVAL;

		if (get_user(new_cm, (int __user *)newval))
			return -EFAULT;

		return try_set_cm(new_cm)?:1;
	}
	return 1;
}


static struct ctl_table pm_table[] =
{
	{CTL_PM_SUSPEND, "suspend", NULL, 0, 0200, NULL, &sysctl_pm_do_suspend},
	{CTL_PM_CMODE, "cmode", &clock_cmode_current, sizeof(int), 0644, NULL, &cmode_procctl, &cmode_sysctl, NULL},
	{CTL_PM_P0, "p0", &clock_p0_current, sizeof(int), 0644, NULL, &p0_procctl, &p0_sysctl, NULL},
	{CTL_PM_CM, "cm", &clock_cm_current, sizeof(int), 0644, NULL, &cm_procctl, &cm_sysctl, NULL},
	{0}
};

static struct ctl_table pm_dir_table[] =
{
	{CTL_PM, "pm", NULL, 0, 0555, pm_table},
	{0}
};

/*
 * Initialize power interface
 */
static int __init pm_init(void)
{
	register_sysctl_table(pm_dir_table, 0);
	return 0;
}

__initcall(pm_init);

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* FR-V Power Management Routines
	3	*
	4	* Copyright (c) 2004 Red Hat, Inc.
	5	*
	6	* Based on SA1100 version:
	7	* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License.
	11	*
	12	*/
	13
1da177e4	14	#include <linux/init.h>
40234401	15	#include <linux/module.h>
1da177e4	16	#include <linux/pm.h>
bca73e4b	17	#include <linux/pm_legacy.h>
1da177e4 LT	18	#include <linux/sched.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/sysctl.h>
	21	#include <linux/errno.h>
	22	#include <linux/delay.h>
	23	#include <asm/uaccess.h>
	24
	25	#include <asm/mb86943a.h>
	26
	27	#include "local.h"
	28
1da177e4 LT	29	/*
	30	* Debug macros
	31	*/
	32	#define DEBUG
	33
	34	int pm_do_suspend(void)
	35	{
	36	local_irq_disable();
	37
	38	__set_LEDS(0xb1);
	39
	40	/* go zzz */
	41	frv_cpu_suspend(pdm_suspend_mode);
	42
	43	__set_LEDS(0xb2);
	44
	45	local_irq_enable();
	46
	47	return 0;
	48	}
	49
	50	static unsigned long __irq_mask;
	51
	52	/*
	53	* Setup interrupt masks, etc to enable wakeup by power switch
	54	*/
	55	static void __default_power_switch_setup(void)
	56	{
	57	/* default is to mask all interrupt sources. */
	58	__irq_mask = (unsigned long )0xfeff9820;
	59	(unsigned long )0xfeff9820 = 0xfffe0000;
	60	}
	61
	62	/*
	63	* Cleanup interrupt masks, etc after wakeup by power switch
	64	*/
	65	static void __default_power_switch_cleanup(void)
	66	{
	67	(unsigned long )0xfeff9820 = __irq_mask;
	68	}
	69
	70	/*
	71	* Return non-zero if wakeup irq was caused by power switch
	72	*/
	73	static int __default_power_switch_check(void)
	74	{
	75	return 1;
	76	}
	77
	78	void (*__power_switch_wake_setup)(void) = __default_power_switch_setup;
	79	int (*__power_switch_wake_check)(void) = __default_power_switch_check;
	80	void (*__power_switch_wake_cleanup)(void) = __default_power_switch_cleanup;
	81
	82	int pm_do_bus_sleep(void)
	83	{
	84	local_irq_disable();
	85
	86	/*
	87	* Here is where we need some platform-dependent setup
	88	* of the interrupt state so that appropriate wakeup
	89	* sources are allowed and all others are masked.
	90	*/
	91	__power_switch_wake_setup();
	92
93	__set_LEDS(0xa1);
94
95	/* go zzz
96	*
97	* This is in a loop in case power switch shares an irq with other
98	* devices. The wake_check() tells us if we need to finish waking
99	* or go back to sleep.
100	*/
101	do {
102	frv_cpu_suspend(HSR0_PDM_BUS_SLEEP);
103	} while (__power_switch_wake_check && !__power_switch_wake_check());
104
105	__set_LEDS(0xa2);
106
107	/*
108	* Here is where we need some platform-dependent restore
109	* of the interrupt state prior to being called.
110	*/
111	__power_switch_wake_cleanup();
112
113	local_irq_enable();
114
115	return 0;
116	}
117
118	unsigned long sleep_phys_sp(void *sp)
119	{
120	return virt_to_phys(sp);
121	}
122
123	#ifdef CONFIG_SYSCTL
124	/*
125	* Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
126	* when all the PM interfaces exist nicely.
127	*/
1da177e4 LT	128	#define CTL_PM_SUSPEND 1
	129	#define CTL_PM_CMODE 2
	130	#define CTL_PM_P0 4
	131	#define CTL_PM_CM 5
	132
7ab76d72	133	static int user_atoi(char __user *ubuf, size_t len)
1da177e4 LT	134	{
	135	char buf[16];
	136	unsigned long ret;
	137
	138	if (len > 15)
	139	return -EINVAL;
	140
	141	if (copy_from_user(buf, ubuf, len))
	142	return -EFAULT;
	143
	144	buf[len] = 0;
	145	ret = simple_strtoul(buf, NULL, 0);
	146	if (ret > INT_MAX)
	147	return -ERANGE;
	148	return ret;
	149	}
	150
	151	/*
	152	* Send us to sleep.
	153	*/
	154	static int sysctl_pm_do_suspend(ctl_table ctl, int write, struct file filp,
7ab76d72	155	void __user buffer, size_t lenp, loff_t *fpos)
1da177e4 LT	156	{
	157	int retval, mode;
	158
	159	if (*lenp <= 0)
	160	return -EIO;
	161
	162	mode = user_atoi(buffer, *lenp);
	163	if ((mode != 1) && (mode != 5))
	164	return -EINVAL;
	165
	166	retval = pm_send_all(PM_SUSPEND, (void *)3);
	167
	168	if (retval == 0) {
	169	if (mode == 5)
	170	retval = pm_do_bus_sleep();
	171	else
	172	retval = pm_do_suspend();
	173	pm_send_all(PM_RESUME, (void *)0);
	174	}
	175
	176	return retval;
	177	}
	178
	179	static int try_set_cmode(int new_cmode)
	180	{
	181	if (new_cmode > 15)
	182	return -EINVAL;
	183	if (!(clock_cmodes_permitted & (1<<new_cmode)))
	184	return -EINVAL;
	185
	186	/* tell all the drivers we're suspending */
	187	pm_send_all(PM_SUSPEND, (void *)3);
	188
	189	/* now change cmode */
	190	local_irq_disable();
	191	frv_dma_pause_all();
	192
	193	frv_change_cmode(new_cmode);
	194
	195	determine_clocks(0);
	196	time_divisor_init();
	197
	198	#ifdef DEBUG
	199	determine_clocks(1);
	200	#endif
	201	frv_dma_resume_all();
	202	local_irq_enable();
	203
	204	/* tell all the drivers we're resuming */
	205	pm_send_all(PM_RESUME, (void *)0);
	206	return 0;
	207	}
	208
	209
	210	static int cmode_procctl(ctl_table ctl, int write, struct file filp,
7ab76d72	211	void __user buffer, size_t lenp, loff_t *fpos)
1da177e4 LT	212	{
	213	int new_cmode;
	214
	215	if (!write)
	216	return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
	217
	218	new_cmode = user_atoi(buffer, *lenp);
	219
	220	return try_set_cmode(new_cmode)?:*lenp;
	221	}
	222
7ab76d72 AV	223	static int cmode_sysctl(ctl_table table, int __user name, int nlen,
7ab76d72 AV	224	void __user oldval, size_t __user oldlenp,
1f29bcd7	225	void __user *newval, size_t newlen)
1da177e4 LT	226	{
	227	if (oldval && oldlenp) {
	228	size_t oldlen;
	229
	230	if (get_user(oldlen, oldlenp))
	231	return -EFAULT;
	232
	233	if (oldlen != sizeof(int))
	234	return -EINVAL;
	235
7ab76d72	236	if (put_user(clock_cmode_current, (unsigned __user *)oldval) \|\|
1da177e4 LT	237	put_user(sizeof(int), oldlenp))
	238	return -EFAULT;
	239	}
	240	if (newval && newlen) {
	241	int new_cmode;
	242
	243	if (newlen != sizeof(int))
	244	return -EINVAL;
	245
7ab76d72	246	if (get_user(new_cmode, (int __user *)newval))
1da177e4 LT	247	return -EFAULT;
	248
	249	return try_set_cmode(new_cmode)?:1;
	250	}
	251	return 1;
	252	}
	253
	254	static int try_set_p0(int new_p0)
	255	{
	256	unsigned long flags, clkc;
	257
	258	if (new_p0 < 0 \|\| new_p0 > 1)
	259	return -EINVAL;
	260
	261	local_irq_save(flags);
	262	__set_PSR(flags & ~PSR_ET);
	263
	264	frv_dma_pause_all();
	265
	266	clkc = __get_CLKC();
	267	if (new_p0)
	268	clkc \|= CLKC_P0;
	269	else
	270	clkc &= ~CLKC_P0;
	271	__set_CLKC(clkc);
	272
	273	determine_clocks(0);
	274	time_divisor_init();
	275
	276	#ifdef DEBUG
	277	determine_clocks(1);
	278	#endif
	279	frv_dma_resume_all();
	280	local_irq_restore(flags);
	281	return 0;
	282	}
	283
	284	static int try_set_cm(int new_cm)
	285	{
	286	unsigned long flags, clkc;
	287
	288	if (new_cm < 0 \|\| new_cm > 1)
	289	return -EINVAL;
	290
	291	local_irq_save(flags);
	292	__set_PSR(flags & ~PSR_ET);
	293
	294	frv_dma_pause_all();
	295
	296	clkc = __get_CLKC();
	297	clkc &= ~CLKC_CM;
	298	clkc \|= new_cm;
	299	__set_CLKC(clkc);
	300
	301	determine_clocks(0);
	302	time_divisor_init();
	303
	304	#if 1 //def DEBUG
	305	determine_clocks(1);
	306	#endif
	307
	308	frv_dma_resume_all();
	309	local_irq_restore(flags);
	310	return 0;
311	}
312
313	static int p0_procctl(ctl_table ctl, int write, struct file filp,
7ab76d72	314	void __user buffer, size_t lenp, loff_t *fpos)
1da177e4 LT	315	{
	316	int new_p0;
	317
	318	if (!write)
	319	return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
	320
	321	new_p0 = user_atoi(buffer, *lenp);
	322
	323	return try_set_p0(new_p0)?:*lenp;
	324	}
	325
7ab76d72 AV	326	static int p0_sysctl(ctl_table table, int __user name, int nlen,
7ab76d72 AV	327	void __user oldval, size_t __user oldlenp,
1f29bcd7	328	void __user *newval, size_t newlen)
1da177e4 LT	329	{
	330	if (oldval && oldlenp) {
	331	size_t oldlen;
	332
	333	if (get_user(oldlen, oldlenp))
	334	return -EFAULT;
	335
	336	if (oldlen != sizeof(int))
	337	return -EINVAL;
	338
7ab76d72	339	if (put_user(clock_p0_current, (unsigned __user *)oldval) \|\|
1da177e4 LT	340	put_user(sizeof(int), oldlenp))
	341	return -EFAULT;
	342	}
	343	if (newval && newlen) {
	344	int new_p0;
	345
	346	if (newlen != sizeof(int))
	347	return -EINVAL;
	348
7ab76d72	349	if (get_user(new_p0, (int __user *)newval))
1da177e4 LT	350	return -EFAULT;
	351
	352	return try_set_p0(new_p0)?:1;
	353	}
	354	return 1;
	355	}
	356
	357	static int cm_procctl(ctl_table ctl, int write, struct file filp,
7ab76d72	358	void __user buffer, size_t lenp, loff_t *fpos)
1da177e4 LT	359	{
	360	int new_cm;
	361
	362	if (!write)
	363	return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
	364
	365	new_cm = user_atoi(buffer, *lenp);
	366
	367	return try_set_cm(new_cm)?:*lenp;
	368	}
	369
7ab76d72 AV	370	static int cm_sysctl(ctl_table table, int __user name, int nlen,
7ab76d72 AV	371	void __user oldval, size_t __user oldlenp,
1f29bcd7	372	void __user *newval, size_t newlen)
1da177e4 LT	373	{
	374	if (oldval && oldlenp) {
	375	size_t oldlen;
	376
	377	if (get_user(oldlen, oldlenp))
	378	return -EFAULT;
	379
	380	if (oldlen != sizeof(int))
	381	return -EINVAL;
	382
7ab76d72	383	if (put_user(clock_cm_current, (unsigned __user *)oldval) \|\|
1da177e4 LT	384	put_user(sizeof(int), oldlenp))
	385	return -EFAULT;
	386	}
	387	if (newval && newlen) {
	388	int new_cm;
	389
	390	if (newlen != sizeof(int))
	391	return -EINVAL;
	392
7ab76d72	393	if (get_user(new_cm, (int __user *)newval))
1da177e4 LT	394	return -EFAULT;
	395
	396	return try_set_cm(new_cm)?:1;
	397	}
	398	return 1;
	399	}
	400
	401
	402	static struct ctl_table pm_table[] =
	403	{
	404	{CTL_PM_SUSPEND, "suspend", NULL, 0, 0200, NULL, &sysctl_pm_do_suspend},
	405	{CTL_PM_CMODE, "cmode", &clock_cmode_current, sizeof(int), 0644, NULL, &cmode_procctl, &cmode_sysctl, NULL},
	406	{CTL_PM_P0, "p0", &clock_p0_current, sizeof(int), 0644, NULL, &p0_procctl, &p0_sysctl, NULL},
	407	{CTL_PM_CM, "cm", &clock_cm_current, sizeof(int), 0644, NULL, &cm_procctl, &cm_sysctl, NULL},
	408	{0}
	409	};
	410
	411	static struct ctl_table pm_dir_table[] =
	412	{
	413	{CTL_PM, "pm", NULL, 0, 0555, pm_table},
	414	{0}
	415	};
	416
	417	/*
	418	* Initialize power interface
	419	*/
	420	static int __init pm_init(void)
	421	{
febe1c25	422	register_sysctl_table(pm_dir_table, 0);
1da177e4 LT	423	return 0;
	424	}
	425
	426	__initcall(pm_init);
	427
	428	#endif