[deliverable/linux.git] / arch / mips / alchemy / devboards / pm.c

/*
 * Alchemy Development Board example suspend userspace interface.
 *
 * (c) 2008 Manuel Lauss <mano@roarinelk.homelinux.net>
 */

#include <linux/init.h>
#include <linux/kobject.h>
#include <linux/suspend.h>
#include <linux/sysfs.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/gpio.h>
#include <asm/mach-db1x00/bcsr.h>

/*
 * Generic suspend userspace interface for Alchemy development boards.
 * This code exports a few sysfs nodes under /sys/power/db1x/ which
 * can be used by userspace to en/disable all au1x-provided wakeup
 * sources and configure the timeout after which the the TOYMATCH2 irq
 * is to trigger a wakeup.
 */


static unsigned long db1x_pm_sleep_secs;
static unsigned long db1x_pm_wakemsk;
static unsigned long db1x_pm_last_wakesrc;

static int db1x_pm_enter(suspend_state_t state)
{
	unsigned short bcsrs[16];
	int i, j, hasint;

	/* save CPLD regs */
	hasint = bcsr_read(BCSR_WHOAMI);
	hasint = BCSR_WHOAMI_BOARD(hasint) >= BCSR_WHOAMI_DB1200;
	j = (hasint) ? BCSR_MASKSET : BCSR_SYSTEM;

	for (i = BCSR_STATUS; i <= j; i++)
		bcsrs[i] = bcsr_read(i);

	/* shut off hexleds */
	bcsr_write(BCSR_HEXCLEAR, 3);

	/* enable GPIO based wakeup */
	alchemy_gpio1_input_enable();

	/* clear and setup wake cause and source */
	au_writel(0, SYS_WAKEMSK);
	au_sync();
	au_writel(0, SYS_WAKESRC);
	au_sync();

	au_writel(db1x_pm_wakemsk, SYS_WAKEMSK);
	au_sync();

	/* setup 1Hz-timer-based wakeup: wait for reg access */
	while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20)
		asm volatile ("nop");

	au_writel(au_readl(SYS_TOYREAD) + db1x_pm_sleep_secs, SYS_TOYMATCH2);
	au_sync();

	/* wait for value to really hit the register */
	while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20)
		asm volatile ("nop");

	/* ...and now the sandman can come! */
	au_sleep();


	/* restore CPLD regs */
	for (i = BCSR_STATUS; i <= BCSR_SYSTEM; i++)
		bcsr_write(i, bcsrs[i]);

	/* restore CPLD int registers */
	if (hasint) {
		bcsr_write(BCSR_INTCLR, 0xffff);
		bcsr_write(BCSR_MASKCLR, 0xffff);
		bcsr_write(BCSR_INTSTAT, 0xffff);
		bcsr_write(BCSR_INTSET, bcsrs[BCSR_INTSET]);
		bcsr_write(BCSR_MASKSET, bcsrs[BCSR_MASKSET]);
	}

	/* light up hexleds */
	bcsr_write(BCSR_HEXCLEAR, 0);

	return 0;
}

static int db1x_pm_begin(suspend_state_t state)
{
	if (!db1x_pm_wakemsk) {
		printk(KERN_ERR "db1x: no wakeup source activated!\n");
		return -EINVAL;
	}

	return 0;
}

static void db1x_pm_end(void)
{
	/* read and store wakeup source, the clear the register. To
	 * be able to clear it, WAKEMSK must be cleared first.
	 */
	db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC);

	au_writel(0, SYS_WAKEMSK);
	au_writel(0, SYS_WAKESRC);
	au_sync();

}

static const struct platform_suspend_ops db1x_pm_ops = {
	.valid		= suspend_valid_only_mem,
	.begin		= db1x_pm_begin,
	.enter		= db1x_pm_enter,
	.end		= db1x_pm_end,
};

#define ATTRCMP(x) (0 == strcmp(attr->attr.name, #x))

static ssize_t db1x_pmattr_show(struct kobject *kobj,
				struct kobj_attribute *attr,
				char *buf)
{
	int idx;

	if (ATTRCMP(timer_timeout))
		return sprintf(buf, "%lu\n", db1x_pm_sleep_secs);

	else if (ATTRCMP(timer))
		return sprintf(buf, "%u\n",
				!!(db1x_pm_wakemsk & SYS_WAKEMSK_M2));

	else if (ATTRCMP(wakesrc))
		return sprintf(buf, "%lu\n", db1x_pm_last_wakesrc);

	else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) ||
		 ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) ||
		 ATTRCMP(gpio6) || ATTRCMP(gpio7)) {
		idx = (attr->attr.name)[4] - '0';
		return sprintf(buf, "%d\n",
			!!(db1x_pm_wakemsk & SYS_WAKEMSK_GPIO(idx)));

	} else if (ATTRCMP(wakemsk)) {
		return sprintf(buf, "%08lx\n", db1x_pm_wakemsk);
	}

	return -ENOENT;
}

static ssize_t db1x_pmattr_store(struct kobject *kobj,
				 struct kobj_attribute *attr,
				 const char *instr,
				 size_t bytes)
{
	unsigned long l;
	int tmp;

	if (ATTRCMP(timer_timeout)) {
		tmp = kstrtoul(instr, 0, &l);
		if (tmp)
			return tmp;

		db1x_pm_sleep_secs = l;

	} else if (ATTRCMP(timer)) {
		if (instr[0] != '0')
			db1x_pm_wakemsk |= SYS_WAKEMSK_M2;
		else
			db1x_pm_wakemsk &= ~SYS_WAKEMSK_M2;

	} else if (ATTRCMP(gpio0) || ATTRCMP(gpio1) || ATTRCMP(gpio2) ||
		   ATTRCMP(gpio3) || ATTRCMP(gpio4) || ATTRCMP(gpio5) ||
		   ATTRCMP(gpio6) || ATTRCMP(gpio7)) {
		tmp = (attr->attr.name)[4] - '0';
		if (instr[0] != '0') {
			db1x_pm_wakemsk |= SYS_WAKEMSK_GPIO(tmp);
		} else {
			db1x_pm_wakemsk &= ~SYS_WAKEMSK_GPIO(tmp);
		}

	} else if (ATTRCMP(wakemsk)) {
		tmp = kstrtoul(instr, 0, &l);
		if (tmp)
			return tmp;

		db1x_pm_wakemsk = l & 0x0000003f;

	} else
		bytes = -ENOENT;

	return bytes;
}

#define ATTR(x)							\
	static struct kobj_attribute x##_attribute =		\
		__ATTR(x, 0664, db1x_pmattr_show,		\
				db1x_pmattr_store);

ATTR(gpio0)		/* GPIO-based wakeup enable */
ATTR(gpio1)
ATTR(gpio2)
ATTR(gpio3)
ATTR(gpio4)
ATTR(gpio5)
ATTR(gpio6)
ATTR(gpio7)
ATTR(timer)		/* TOYMATCH2-based wakeup enable */
ATTR(timer_timeout)	/* timer-based wakeup timeout value, in seconds */
ATTR(wakesrc)		/* contents of SYS_WAKESRC after last wakeup */
ATTR(wakemsk)		/* direct access to SYS_WAKEMSK */

#define ATTR_LIST(x)	& x ## _attribute.attr
static struct attribute *db1x_pmattrs[] = {
	ATTR_LIST(gpio0),
	ATTR_LIST(gpio1),
	ATTR_LIST(gpio2),
	ATTR_LIST(gpio3),
	ATTR_LIST(gpio4),
	ATTR_LIST(gpio5),
	ATTR_LIST(gpio6),
	ATTR_LIST(gpio7),
	ATTR_LIST(timer),
	ATTR_LIST(timer_timeout),
	ATTR_LIST(wakesrc),
	ATTR_LIST(wakemsk),
	NULL,		/* terminator */
};

static struct attribute_group db1x_pmattr_group = {
	.name	= "db1x",
	.attrs	= db1x_pmattrs,
};

/*
 * Initialize suspend interface
 */
static int __init pm_init(void)
{
	/* init TOY to tick at 1Hz if not already done. No need to wait
	 * for confirmation since there's plenty of time from here to
	 * the next suspend cycle.
	 */
	if (au_readl(SYS_TOYTRIM) != 32767) {
		au_writel(32767, SYS_TOYTRIM);
		au_sync();
	}

	db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC);

	au_writel(0, SYS_WAKESRC);
	au_sync();
	au_writel(0, SYS_WAKEMSK);
	au_sync();

	suspend_set_ops(&db1x_pm_ops);

	return sysfs_create_group(power_kobj, &db1x_pmattr_group);
}

late_initcall(pm_init);
Commit	Line	Data
61f9c58d ML	1	/*
	2	* Alchemy Development Board example suspend userspace interface.
	3	*
	4	* (c) 2008 Manuel Lauss <mano@roarinelk.homelinux.net>
	5	*/
	6
	7	#include <linux/init.h>
	8	#include <linux/kobject.h>
	9	#include <linux/suspend.h>
	10	#include <linux/sysfs.h>
	11	#include <asm/mach-au1x00/au1000.h>
ce65cc8f	12	#include <asm/mach-au1x00/gpio.h>
e275ed5e	13	#include <asm/mach-db1x00/bcsr.h>
61f9c58d ML	14
	15	/*
	16	* Generic suspend userspace interface for Alchemy development boards.
	17	* This code exports a few sysfs nodes under /sys/power/db1x/ which
	18	* can be used by userspace to en/disable all au1x-provided wakeup
	19	* sources and configure the timeout after which the the TOYMATCH2 irq
	20	* is to trigger a wakeup.
	21	*/
	22
	23
	24	static unsigned long db1x_pm_sleep_secs;
	25	static unsigned long db1x_pm_wakemsk;
	26	static unsigned long db1x_pm_last_wakesrc;
	27
	28	static int db1x_pm_enter(suspend_state_t state)
	29	{
e275ed5e ML	30	unsigned short bcsrs[16];
	31	int i, j, hasint;
	32
	33	/* save CPLD regs */
	34	hasint = bcsr_read(BCSR_WHOAMI);
	35	hasint = BCSR_WHOAMI_BOARD(hasint) >= BCSR_WHOAMI_DB1200;
	36	j = (hasint) ? BCSR_MASKSET : BCSR_SYSTEM;
	37
	38	for (i = BCSR_STATUS; i <= j; i++)
	39	bcsrs[i] = bcsr_read(i);
	40
	41	/* shut off hexleds */
	42	bcsr_write(BCSR_HEXCLEAR, 3);
	43
61f9c58d	44	/* enable GPIO based wakeup */
ce65cc8f	45	alchemy_gpio1_input_enable();
61f9c58d ML	46
	47	/* clear and setup wake cause and source */
	48	au_writel(0, SYS_WAKEMSK);
	49	au_sync();
	50	au_writel(0, SYS_WAKESRC);
	51	au_sync();
	52
	53	au_writel(db1x_pm_wakemsk, SYS_WAKEMSK);
	54	au_sync();
	55
	56	/* setup 1Hz-timer-based wakeup: wait for reg access */
	57	while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20)
	58	asm volatile ("nop");
	59
	60	au_writel(au_readl(SYS_TOYREAD) + db1x_pm_sleep_secs, SYS_TOYMATCH2);
	61	au_sync();
	62
	63	/* wait for value to really hit the register */
	64	while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20)
	65	asm volatile ("nop");
	66
	67	/* ...and now the sandman can come! */
	68	au_sleep();
	69
e275ed5e ML	70
	71	/* restore CPLD regs */
	72	for (i = BCSR_STATUS; i <= BCSR_SYSTEM; i++)
	73	bcsr_write(i, bcsrs[i]);
	74
	75	/* restore CPLD int registers */
	76	if (hasint) {
	77	bcsr_write(BCSR_INTCLR, 0xffff);
	78	bcsr_write(BCSR_MASKCLR, 0xffff);
	79	bcsr_write(BCSR_INTSTAT, 0xffff);
	80	bcsr_write(BCSR_INTSET, bcsrs[BCSR_INTSET]);
	81	bcsr_write(BCSR_MASKSET, bcsrs[BCSR_MASKSET]);
	82	}
	83
	84	/* light up hexleds */
	85	bcsr_write(BCSR_HEXCLEAR, 0);
	86
61f9c58d ML	87	return 0;
	88	}
	89
	90	static int db1x_pm_begin(suspend_state_t state)
	91	{
	92	if (!db1x_pm_wakemsk) {
	93	printk(KERN_ERR "db1x: no wakeup source activated!\n");
	94	return -EINVAL;
	95	}
	96
	97	return 0;
	98	}
	99
	100	static void db1x_pm_end(void)
	101	{
	102	/* read and store wakeup source, the clear the register. To
	103	* be able to clear it, WAKEMSK must be cleared first.
	104	*/
	105	db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC);
	106
	107	au_writel(0, SYS_WAKEMSK);
	108	au_writel(0, SYS_WAKESRC);
	109	au_sync();
	110
	111	}
	112
2f55ac07	113	static const struct platform_suspend_ops db1x_pm_ops = {
61f9c58d ML	114	.valid = suspend_valid_only_mem,
	115	.begin = db1x_pm_begin,
	116	.enter = db1x_pm_enter,
	117	.end = db1x_pm_end,
	118	};
	119
	120	#define ATTRCMP(x) (0 == strcmp(attr->attr.name, #x))
	121
	122	static ssize_t db1x_pmattr_show(struct kobject *kobj,
	123	struct kobj_attribute *attr,
	124	char *buf)
	125	{
	126	int idx;
	127
	128	if (ATTRCMP(timer_timeout))
	129	return sprintf(buf, "%lu\n", db1x_pm_sleep_secs);
	130
	131	else if (ATTRCMP(timer))
	132	return sprintf(buf, "%u\n",
	133	!!(db1x_pm_wakemsk & SYS_WAKEMSK_M2));
	134
	135	else if (ATTRCMP(wakesrc))
	136	return sprintf(buf, "%lu\n", db1x_pm_last_wakesrc);
	137
	138	else if (ATTRCMP(gpio0) \|\| ATTRCMP(gpio1) \|\| ATTRCMP(gpio2) \|\|
	139	ATTRCMP(gpio3) \|\| ATTRCMP(gpio4) \|\| ATTRCMP(gpio5) \|\|
	140	ATTRCMP(gpio6) \|\| ATTRCMP(gpio7)) {
	141	idx = (attr->attr.name)[4] - '0';
	142	return sprintf(buf, "%d\n",
	143	!!(db1x_pm_wakemsk & SYS_WAKEMSK_GPIO(idx)));
	144
	145	} else if (ATTRCMP(wakemsk)) {
	146	return sprintf(buf, "%08lx\n", db1x_pm_wakemsk);
	147	}
	148
	149	return -ENOENT;
	150	}
	151
	152	static ssize_t db1x_pmattr_store(struct kobject *kobj,
	153	struct kobj_attribute *attr,
	154	const char *instr,
	155	size_t bytes)
	156	{
	157	unsigned long l;
	158	int tmp;
	159
	160	if (ATTRCMP(timer_timeout)) {
8ca635bf	161	tmp = kstrtoul(instr, 0, &l);
61f9c58d ML	162	if (tmp)
	163	return tmp;
	164
	165	db1x_pm_sleep_secs = l;
	166
	167	} else if (ATTRCMP(timer)) {
	168	if (instr[0] != '0')
	169	db1x_pm_wakemsk \|= SYS_WAKEMSK_M2;
	170	else
	171	db1x_pm_wakemsk &= ~SYS_WAKEMSK_M2;
	172
	173	} else if (ATTRCMP(gpio0) \|\| ATTRCMP(gpio1) \|\| ATTRCMP(gpio2) \|\|
	174	ATTRCMP(gpio3) \|\| ATTRCMP(gpio4) \|\| ATTRCMP(gpio5) \|\|
	175	ATTRCMP(gpio6) \|\| ATTRCMP(gpio7)) {
	176	tmp = (attr->attr.name)[4] - '0';
	177	if (instr[0] != '0') {
	178	db1x_pm_wakemsk \|= SYS_WAKEMSK_GPIO(tmp);
	179	} else {
	180	db1x_pm_wakemsk &= ~SYS_WAKEMSK_GPIO(tmp);
	181	}
	182
	183	} else if (ATTRCMP(wakemsk)) {
8ca635bf	184	tmp = kstrtoul(instr, 0, &l);
61f9c58d ML	185	if (tmp)
	186	return tmp;
	187
	188	db1x_pm_wakemsk = l & 0x0000003f;
	189
	190	} else
	191	bytes = -ENOENT;
	192
	193	return bytes;
	194	}
	195
	196	#define ATTR(x) \
70342287	197	static struct kobj_attribute x##_attribute = \
61f9c58d ML	198	__ATTR(x, 0664, db1x_pmattr_show, \
	199	db1x_pmattr_store);
	200
	201	ATTR(gpio0) /* GPIO-based wakeup enable */
	202	ATTR(gpio1)
	203	ATTR(gpio2)
	204	ATTR(gpio3)
	205	ATTR(gpio4)
	206	ATTR(gpio5)
	207	ATTR(gpio6)
	208	ATTR(gpio7)
	209	ATTR(timer) /* TOYMATCH2-based wakeup enable */
	210	ATTR(timer_timeout) /* timer-based wakeup timeout value, in seconds */
	211	ATTR(wakesrc) /* contents of SYS_WAKESRC after last wakeup */
	212	ATTR(wakemsk) /* direct access to SYS_WAKEMSK */
	213
	214	#define ATTR_LIST(x) & x ## _attribute.attr
	215	static struct attribute *db1x_pmattrs[] = {
	216	ATTR_LIST(gpio0),
	217	ATTR_LIST(gpio1),
	218	ATTR_LIST(gpio2),
	219	ATTR_LIST(gpio3),
	220	ATTR_LIST(gpio4),
	221	ATTR_LIST(gpio5),
	222	ATTR_LIST(gpio6),
	223	ATTR_LIST(gpio7),
	224	ATTR_LIST(timer),
	225	ATTR_LIST(timer_timeout),
	226	ATTR_LIST(wakesrc),
	227	ATTR_LIST(wakemsk),
	228	NULL, /* terminator */
	229	};
	230
	231	static struct attribute_group db1x_pmattr_group = {
	232	.name = "db1x",
	233	.attrs = db1x_pmattrs,
	234	};
	235
	236	/*
	237	* Initialize suspend interface
	238	*/
	239	static int __init pm_init(void)
	240	{
	241	/* init TOY to tick at 1Hz if not already done. No need to wait
	242	* for confirmation since there's plenty of time from here to
	243	* the next suspend cycle.
	244	*/
	245	if (au_readl(SYS_TOYTRIM) != 32767) {
	246	au_writel(32767, SYS_TOYTRIM);
	247	au_sync();
	248	}
	249
	250	db1x_pm_last_wakesrc = au_readl(SYS_WAKESRC);
	251
	252	au_writel(0, SYS_WAKESRC);
	253	au_sync();
	254	au_writel(0, SYS_WAKEMSK);
	255	au_sync();
	256
	257	suspend_set_ops(&db1x_pm_ops);
	258
	259	return sysfs_create_group(power_kobj, &db1x_pmattr_group);
	260	}
	261
262	late_initcall(pm_init);