diff options
| author | Juergen Borleis <jbe@pengutronix.de> | 2015-04-27 15:59:50 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2015-06-19 20:03:21 +0200 |
| commit | a7c535e3a8e50e625750d2aa0ed4f84591ca7bfa (patch) | |
| tree | 93789de830bbb2c6dd0d7eee6fcee9d1d02dcf7c /drivers/rtc/rtc-imxdi.c | |
| parent | c7e9bbe022c7bee57d9e14b42a7c3732da8db558 (diff) | |
| download | linux-a7c535e3a8e50e625750d2aa0ed4f84591ca7bfa.tar.bz2 | |
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>
Diffstat (limited to 'drivers/rtc/rtc-imxdi.c')
| -rw-r--r-- | drivers/rtc/rtc-imxdi.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-imxdi.c b/drivers/rtc/rtc-imxdi.c index 3d7f0390170e..a08da4a353db 100644 --- a/drivers/rtc/rtc-imxdi.c +++ b/drivers/rtc/rtc-imxdi.c @@ -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); |