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Commit a7c535e3 authored by Juergen Borleis's avatar Juergen Borleis Committed by Alexandre Belloni
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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: default avatarJuergen Borleis <jbe@pengutronix.de>
Signed-off-by: default avatarRobert Schwebel <rsc@pengutronix.de>
[rsc: got NDA clearance from Freescale]
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent c7e9bbe0

drivers/rtc/rtc-imxdi.c

+19 −2
Original line number Original line Diff line number Diff line
@@ -665,6 +665,25 @@ static irqreturn_t dryice_norm_irq(int irq, void *dev_id) 
	irqreturn_t rc = IRQ_NONE;

	irqreturn_t rc = IRQ_NONE;





	dier = readl(imxdi->ioaddr + DIER);

	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 */

	/* handle write complete and write error cases */

	if (dier & DIER_WCIE) {

	if (dier & DIER_WCIE) {
@@ -675,7 +694,6 @@ static irqreturn_t dryice_norm_irq(int irq, void *dev_id) 
			return rc;

			return rc;





		/* DSR_WCF clears itself on DSR read */

		/* DSR_WCF clears itself on DSR read */

		dsr = readl(imxdi->ioaddr + DSR);

		if (dsr & (DSR_WCF | DSR_WEF)) {

		if (dsr & (DSR_WCF | DSR_WEF)) {

			/* mask the interrupt */

			/* mask the interrupt */

			di_int_disable(imxdi, DIER_WCIE);

			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 */

	/* handle the alarm case */

	if (dier & DIER_CAIE) {

	if (dier & DIER_CAIE) {

		/* DSR_WCF clears itself on DSR read */

		/* DSR_WCF clears itself on DSR read */

		dsr = readl(imxdi->ioaddr + DSR);

		if (dsr & DSR_CAF) {

		if (dsr & DSR_CAF) {

			/* mask the interrupt */

			/* mask the interrupt */

			di_int_disable(imxdi, DIER_CAIE);

			di_int_disable(imxdi, DIER_CAIE);