/*
* tegra_read_persistent_clock64 - Return time from a persistent clock.
*
* Reads the time from a source which isn't disabled during PM, the
* 32k sync timer. Convert the cycles elapsed since last read into
* nsecs and adds to a monotonically increasing timespec64.
* Care must be taken that this funciton is not called while the
* tegra_rtc driver could be executing to avoid race conditions
* on the RTC shadow register
*/
static void tegra_read_persistent_clock64(struct timespec64 *ts)
{
u64 delta;
last_persistent_ms = persistent_ms;
persistent_ms = tegra_rtc_read_ms();
delta = persistent_ms - last_persistent_ms;
timespec64_add_ns(&persistent_ts, delta * NSEC_PER_MSEC);
*ts = persistent_ts;
}
/*
* tegra_read_persistent_clock - Return time from a persistent clock.
*
* Reads the time from a source which isn't disabled during PM, the
* 32k sync timer. Convert the cycles elapsed since last read into
* nsecs and adds to a monotonically increasing timespec.
* Care must be taken that this funciton is not called while the
* tegra_rtc driver could be executing to avoid race conditions
* on the RTC shadow register
*/
static void tegra_read_persistent_clock(struct timespec *ts)
{
u64 delta;
struct timespec *tsp = &persistent_ts;
last_persistent_ms = persistent_ms;
persistent_ms = tegra_rtc_read_ms();
delta = persistent_ms - last_persistent_ms;
timespec_add_ns(tsp, delta * NSEC_PER_MSEC);
*ts = *tsp;
}
/*
* read_persistent_clock - Return time from a persistent clock.
*
* Reads the time from a source which isn't disabled during PM, the
* 32k sync timer. Convert the cycles elapsed since last read into
* nsecs and adds to a monotonically increasing timespec.
* Care must be taken that this funciton is not called while the
* tegra_rtc driver could be executing to avoid race conditions
* on the RTC shadow register
*/
void read_persistent_clock(struct timespec *ts)
{
u64 delta;
struct timespec *tsp = &persistent_ts;
unsigned long flags;
spin_lock_irqsave(&read_persistent_clock_lock, flags);
last_persistent_ms = persistent_ms;
persistent_ms = tegra_rtc_read_ms();
delta = persistent_ms - last_persistent_ms;
timespec_add_ns(tsp, delta * NSEC_PER_MSEC);
*ts = *tsp;
spin_unlock_irqrestore(&read_persistent_clock_lock, flags);
}
/**
* suspend_enter - enter the desired system sleep state.
* @state: state to enter
*
* This function should be called after devices have been suspended.
*/
static int suspend_enter(suspend_state_t state)
{
int error;
if (suspend_ops->prepare) {
error = suspend_ops->prepare();
if (error)
goto Platform_finish;
}
error = dpm_suspend_noirq(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "PM: Some devices failed to power down\n");
goto Platform_finish;
}
if (suspend_ops->prepare_late) {
error = suspend_ops->prepare_late();
if (error)
goto Platform_wake;
}
if (suspend_test(TEST_PLATFORM))
goto Platform_wake;
error = disable_nonboot_cpus();
if (error || suspend_test(TEST_CPUS))
goto Enable_cpus;
arch_suspend_disable_irqs();
BUG_ON(!irqs_disabled());
error = sysdev_suspend(PMSG_SUSPEND);
if (!error) {
if (!suspend_test(TEST_CORE) && pm_check_wakeup_events()) {
error = suspend_ops->enter(state);
rtc_resume_fromtime=tegra_rtc_read_ms();
events_check_enabled = false;
}
sysdev_resume();
}
arch_suspend_enable_irqs();
BUG_ON(irqs_disabled());
Enable_cpus:
enable_nonboot_cpus();
rtc_resume_endtime=tegra_rtc_read_ms();
printk(KERN_ERR "<POWER>resume2[Enable CPU]take %llu ms\n",rtc_resume_endtime-rtc_resume_fromtime);
rtc_resume_fromtime=rtc_resume_endtime;
Platform_wake:
if (suspend_ops->wake)
suspend_ops->wake();
rtc_resume_endtime=tegra_rtc_read_ms();
printk(KERN_ERR "<POWER>resume3[CPU suspend_ops->wake]take %llu ms\n",rtc_resume_endtime-rtc_resume_fromtime);
ktime_resume_fromtime=ktime_get();
dpm_resume_noirq(PMSG_RESUME);
ktime_resume_endtime=ktime_get();
printk(KERN_ERR "<POWER>resume4[CPU resume_noirq]take %llu ns\n",ktime_to_ns(ktime_sub(ktime_resume_endtime, ktime_resume_fromtime)));
ktime_resume_fromtime=ktime_resume_endtime;
Platform_finish:
if (suspend_ops->finish)
suspend_ops->finish();
ktime_resume_endtime=ktime_get();
printk(KERN_ERR "<POWER>resume5[CPU suspend_ops->finish]take %llu ns\n",ktime_to_ns(ktime_sub(ktime_resume_endtime, ktime_resume_fromtime)));
ktime_resume_fromtime=ktime_resume_endtime;
return error;
}
static ssize_t tegra_rtc_sysfs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%llu\n", tegra_rtc_read_ms());
}
