/*
* Enable or disable interrupt on the rising edge of a event line
*/
void stm32_exti_enable_int(unsigned int line, int enable)
{
if (line >= STM32F2_EXTI_NUM_LINES)
goto out;
if (enable) {
stm32_exti_clear_pending(line);
/* Enable trigger on rising edge */
KINETIS_EXTI->rtsr |= (1 << line);
/* Disable trigger on falling edge */
KINETIS_EXTI->ftsr &= ~(1 << line);
/* Enable interrupt for the event */
KINETIS_EXTI->imr |= (1 << line);
} else {
/* Disable interrupt for the event */
KINETIS_EXTI->imr &= ~(1 << line);
/* Disable trigger on rising edge */
KINETIS_EXTI->rtsr &= ~(1 << line);
/* Disable trigger on falling edge */
KINETIS_EXTI->ftsr &= ~(1 << line);
stm32_exti_clear_pending(line);
}
out:
;
}
/*
* enable or disable interrupt
* @line EXTI line
* @enable enable(1) / disable(0)
*/
void stm32_exti_enable_int(unsigned int line, int enable)
{
if (enable) {
stm32_exti_clear_pending(line);
/* Enable interrupt for the event */
writel(readl(&STM32_EXTI->imr) | (1 << line),
&STM32_EXTI->imr);
} else {
/* Disable interrupt for the event */
writel(readl(&STM32_EXTI->imr) & ~(1 << line),
&STM32_EXTI->imr);
/* Disable trigger on rising edge */
writel(readl(&STM32_EXTI->rtsr) & ~(1 << line),
&STM32_EXTI->rtsr);
/* Disable trigger on falling edge */
writel(readl(&STM32_EXTI->ftsr) & ~(1 << line),
&STM32_EXTI->ftsr);
/* Clear pending events if any */
stm32_exti_clear_pending(line);
}
#if defined(DEBUG)
printk("%s:%d,%d=%x\n",
__func__, line, enable, readl(&STM32_EXTI->imr));
#endif
}
/*
* Enable or disable the update interrupts
*/
static int stm32f2_rtc_update_irq_enable(
struct device *dev, unsigned int enabled)
{
struct stm32f2_rtc *rtc = dev_get_drvdata(dev);
spin_lock_irq(&rtc->lock);
if (enabled) {
/* Use Alarm B to emulate update interrupts (1 Hz) */
stm32f2_setup_alarm(1, -1, -1, -1, -1, -1);
stm32f2_alarm_irq_enable(1, 1);
} else {
/* Disable interrupts from Alarm B */
stm32f2_alarm_irq_enable(1, 0);
/* Disable Alarm B */
stm32f2_rtc_write_enable(1);
STM32_RTC->cr &= ~STM32F2_RTC_CR_ALRBE_MSK;
stm32f2_rtc_write_enable(0);
stm32_exti_clear_pending(STM32F2_EXTI_LINE_RTC_ALARM);
}
spin_unlock_irq(&rtc->lock);
return 0;
}
/*
* RTC wakeup interrupt handler
*/
static irqreturn_t stm32f2_rtc_wakeup_irq(int irq, void *dev_id)
{
struct stm32f2_rtc *rtc = (struct stm32f2_rtc *)dev_id;
irqreturn_t rv;
spin_lock(&rtc->lock);
if (!(STM32_RTC->isr & STM32F2_RTC_ISR_WUTF_MSK) ||
!(STM32_RTC->cr & STM32F2_RTC_CR_WUTIE_MSK)) {
rv = IRQ_NONE;
goto out;
}
/* Clear event flag, otherwise new events won't be received */
stm32f2_rtc_write_enable(1);
STM32_RTC->isr &= ~STM32F2_RTC_ISR_WUTF_MSK;
stm32f2_rtc_write_enable(0);
stm32_exti_clear_pending(STM32F2_EXTI_LINE_RTC_WAKEUP);
/* Pass periodic interrupt event to the kernel */
rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
rv = IRQ_HANDLED;
out:
spin_unlock(&rtc->lock);
return rv;
}
/**
* @brief EXTI ISR handler
*
* Check EXTI lines in range @min @max for pending interrupts
*
* @param arg isr argument
* @parram min low end of EXTI# range
* @parram max low end of EXTI# range
*/
static void __stm32_exti_isr(int min, int max, void *arg)
{
struct device *dev = arg;
struct stm32_exti_data *data = dev->driver_data;
int line;
/* see which bits are set */
for (line = min; line < max; line++) {
/* check if interrupt is pending */
if (stm32_exti_is_pending(line)) {
/* clear pending interrupt */
stm32_exti_clear_pending(line);
/* run callback only if one is registered */
if (!data->cb[line].cb) {
continue;
}
data->cb[line].cb(line, data->cb[line].data);
}
}
}
/*
* RTC alarm interrupt handler
*/
static irqreturn_t stm32f2_rtc_alarm_irq(int irq, void *dev_id)
{
unsigned long events = 0;
struct stm32f2_rtc *rtc = (struct stm32f2_rtc *)dev_id;
u32 status;
u32 enabled_irqs;
spin_lock(&rtc->lock);
status = STM32_RTC->isr;
enabled_irqs = STM32_RTC->cr;
stm32f2_rtc_write_enable(1);
/* clear event flags, otherwise new events won't be received */
STM32_RTC->isr &= ~(status &
(STM32F2_RTC_ISR_ALRBF_MSK | STM32F2_RTC_ISR_ALRAF_MSK));
stm32f2_rtc_write_enable(0);
if ((status & STM32F2_RTC_ISR_ALRAF_MSK) &&
(enabled_irqs & STM32F2_RTC_CR_ALRAIE_MSK)) {
/* Normal alarm interrupt */
events |= (RTC_AF | RTC_IRQF);
}
if ((status & STM32F2_RTC_ISR_ALRBF_MSK) &&
(enabled_irqs & STM32F2_RTC_CR_ALRBIE_MSK)) {
/* Update interrupt (1 Hz) */
events |= (RTC_UF | RTC_IRQF);
}
if (events) {
stm32_exti_clear_pending(STM32F2_EXTI_LINE_RTC_ALARM);
rtc_update_irq(rtc->rtc_dev, 1, events);
}
spin_unlock(&rtc->lock);
return events ? IRQ_HANDLED : IRQ_NONE;
}
