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rtc: imxdi: monitor a security violation at runtime 

Maybe the unit enters the hardware related state at runtime and not at
system boot time (after a power cycle).

Signed-off-by: Juergen Borleis <jbe@pengutronix.de>
Signed-off-by: Robert Schwebel <rsc@pengutronix.de>
[rsc: got NDA clearance from Freescale]
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Juergen Borleis 2015-04-27 15:59:50 +02:00 committed by Alexandre Belloni
parent c7e9bbe022
commit a7c535e3a8
1 changed files with 19 additions and 2 deletions
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21
drivers/rtc/rtc-imxdi.c
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@ -665,6 +665,25 @@ static irqreturn_t dryice_norm_irq(int irq, void *dev_id)
irqreturn_t rc = IRQ_NONE;
dier = readl(imxdi->ioaddr + DIER);
dsr = readl(imxdi->ioaddr + DSR);
/* handle the security violation event */
if (dier & DIER_SVIE) {
if (dsr & DSR_SVF) {
/*
* Disable the interrupt when this kind of event has
* happened.
* There cannot be more than one event of this type,
* because it needs a complex state change
* including a main power cycle to get again out of
* this state.
*/
di_int_disable(imxdi, DIER_SVIE);
/* report the violation */
di_report_tamper_info(imxdi, dsr);
rc = IRQ_HANDLED;
}
}
/* handle write complete and write error cases */
if (dier & DIER_WCIE) {
@ -675,7 +694,6 @@ static irqreturn_t dryice_norm_irq(int irq, void *dev_id)
return rc;
/* DSR_WCF clears itself on DSR read */
dsr = readl(imxdi->ioaddr + DSR);
if (dsr & (DSR_WCF | DSR_WEF)) {
/* mask the interrupt */
di_int_disable(imxdi, DIER_WCIE);
@ -691,7 +709,6 @@ static irqreturn_t dryice_norm_irq(int irq, void *dev_id)
/* handle the alarm case */
if (dier & DIER_CAIE) {
/* DSR_WCF clears itself on DSR read */
dsr = readl(imxdi->ioaddr + DSR);
if (dsr & DSR_CAF) {
/* mask the interrupt */
di_int_disable(imxdi, DIER_CAIE);