255 lines
6.1 KiB
C
255 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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-au1000.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 */
|
|
alchemy_wrsys(0, AU1000_SYS_WAKEMSK);
|
|
alchemy_wrsys(0, AU1000_SYS_WAKESRC);
|
|
|
|
alchemy_wrsys(db1x_pm_wakemsk, AU1000_SYS_WAKEMSK);
|
|
|
|
/* setup 1Hz-timer-based wakeup: wait for reg access */
|
|
while (alchemy_rdsys(AU1000_SYS_CNTRCTRL) & SYS_CNTRL_M20)
|
|
asm volatile ("nop");
|
|
|
|
alchemy_wrsys(alchemy_rdsys(AU1000_SYS_TOYREAD) + db1x_pm_sleep_secs,
|
|
AU1000_SYS_TOYMATCH2);
|
|
|
|
/* wait for value to really hit the register */
|
|
while (alchemy_rdsys(AU1000_SYS_CNTRCTRL) & 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 = alchemy_rdsys(AU1000_SYS_WAKESRC);
|
|
|
|
alchemy_wrsys(0, AU1000_SYS_WAKEMSK);
|
|
alchemy_wrsys(0, AU1000_SYS_WAKESRC);
|
|
}
|
|
|
|
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 (alchemy_rdsys(AU1000_SYS_TOYTRIM) != 32767)
|
|
alchemy_wrsys(32767, AU1000_SYS_TOYTRIM);
|
|
|
|
db1x_pm_last_wakesrc = alchemy_rdsys(AU1000_SYS_WAKESRC);
|
|
|
|
alchemy_wrsys(0, AU1000_SYS_WAKESRC);
|
|
alchemy_wrsys(0, AU1000_SYS_WAKEMSK);
|
|
|
|
suspend_set_ops(&db1x_pm_ops);
|
|
|
|
return sysfs_create_group(power_kobj, &db1x_pmattr_group);
|
|
}
|
|
|
|
late_initcall(pm_init);
|